Claims:We Claim:

1. Material handling system involving circular mode of vibration comprising;
a material carrier deck including a material carrier for desired handling involving said circular vibration ;

said material carrier deck attached to eccentric rotary shaft with respect to a support structure ;

said eccentric rotary shafts operatively connected to motor means enabling circular motion of vibration to said material carrier deck including said material carrier thereby favouring desired handling of material passing through said material carrier under said circular motion of vibration of the material carrier deck.

2. Material handling system as claimed in claim 1 wherein said material carrier is selected from a screen deck including a screen mesh or a plate material carrier.

3. Material handling system as claimed in anyone of claims 1 or 2 comprising;
screen deck including a screen mesh ;

said screen deck attached to eccentric rotary shaft with respect to a support structure ;

said eccentric rotary shafts operatively connected to motor means enabling circular motion of vibration to said screen deck carrying said screen mesh thereby favoring screening of undersize material passing through said screen mesh under said circular motion of vibration of the screen deck.

4. Material handling system as claimed in anyone of claims 1 to 3 wherein said screen deck is attached through a support means on two synchronized eccentric shafts fixed near the feed end and discharge end of the screen deck, one end of the eccentric shafts fixed on the screen body while other end of the eccentric shafts are coupled with speed adjustable/controlled motors.

5. Material handling system as claimed in anyone of claims 1 to 4 wherein said screen deck is adapted for controlled inclination toward the discharge end with respect to the feed end preferably involving cooperative jack screws to adjust inclination of the discharge end of the screen deck with respect to the support base.

6. Material handling system as claimed in anyone of claims 1 to 5 wherein the screen mesh is surrounded by side walls and back wall.

7. Material handling system as claimed in anyone of claims 1 to 6 wherein said rotation of the eccentric shafts provides for the circular mode of vibration from feed end to the discharge end of the screen deck preferably the anti clockwise rotation of the eccentric shafts providing circular motion to the screen deck inducing amplitude and forward motion to the particle towards the discharge end of the screen helping repeated and longer exposure of the particle to the screen aperture thereby improving the efficiency of the material screening and particle separation including avoids clogging of the apertures due to wet feed material upto a moisture of 20 %.

8. Material handling system as claimed in anyone of claims 1 to 7 including screen deck fixation and eccentric shaft fixation involving support systems with bearings to reduce the frictional forces, vibrations transmission to the screen body.

9. Material handling system as claimed in anyone of claims 1 to 8 wherein the screen deck and eccentric shafts are fitted through friction free support systems on the screen body such that it distributes equally the structural load on the shafts driven by individual drive motors there by reducing the power requirements and energy efficient.

10. Material handling system as claimed in anyone of claims 1 to 9 wherein both the eccentric shafts are coupled to synchronized individual drive motors with speed control, the amplitude and forward motion of the particle controlled through the drive speed control to optimize the machine productivity and separation/screening efficiency.

11. Material handling system as claimed in anyone of claims 1 to 10 comprising jack screws provided at the discharge end of the screen body facilitate lifting of the screen deck to a positive upward angular position at the discharge end of the screen helping adjust/control the residence time of the material on the screen deck.

12. Material handling system as claimed in anyone of claims 1 to 11 having means for controlling screen deck angle adjustment /control including jack screws provided at the discharge end of the screen body facilitate lifting of the screen deck to a positive upward angular position between 0- 15 deg. enabling adjust/control the residence time of the material on the screen deck and particle velocity and with improved residence time of the material favoring increased and repeated exposure of the material increasing the separation efficiency.

13. The material handling system as claimed in anyone of claims 1 to 12 wherein the solid plate is provided to replace screen mesh on the screen deck for operation as a material feeding machine.

14. The material handling system as claimed in anyone of claims 1 to 13 wherein the screen deck is adapted to be fitted with interchangeable screen mesh with selective aperture to handle different material sizes and moisture levels of the feed material.

15. The material handling system as claimed in anyone of claims 1 to 14 comprising means for adjusting the eccentricity, screen deck angle and drive speed for a wide variety of raw materials including iron ore, lime stone, sand, slag, coal etc. with varying size ranges and feed moisture.

Dated this the 24th day of December, 2018
Anjan Sen
Of Anjan Sen & Associates
(Applicant’s Agent)
IN/PA-199

, Description:FIELD OF THE INVENTION

The present invention relates to a material handling system involving a vibrating screen. More particularly, the present invention is directed to a screening system/machine comprising of a rigid body, screen deck fitted on two eccentric shafts attached independently to two synchronized drive motors controlled through a variable frequency drive(VFD), wherein the two eccentric shafts provide circular mode of vibration to the screen deck for feeding/screening the material loaded on screen. The base of the screen body at the discharge end is provided with two jack bolts for varying the screen deck inclination (a). In the present invention the inclination angle can be varied from 0 degree to 15 degrees in upward sloping direction. The present invention provides flexibility for variations in the circular mode of vibrations by adjusting the eccentricity of the shaft, efficiency and throughput by adjustment in speed of the motor. The system ensures material screening/handling with low friction, low vibration, angle adjustable, speed adjustable, high screen mesh life, self cleaning and high efficient screening machine. The present invention also provides flexibility to use the screening machine as a feeding machine also with angle inclination set at zero degree.

BACKGROUND OF THE INVENTION

Vibrating screening machines are widely used in screening of mineral ores. Generally the vibrating screening machines consists of a rigid screen body, a floating screen deck attached on springs and driven by an eccentric cam. The screen deck is fixed at a negative inclination. The vibrating screens have fixed amplitude, speed and deck angle and provide constant throughput. The organic screening efficiency of the vibrating screens is around 65 % due to the rolling effect and insufficient exposure of the material to the screen aperture. Further, the vibrations of the machine are transmitted to the main body of the screen requiring higher structural strength for installation of the screen particularly at heights.

Timothy L. Noms et al., Patent dated Nov 30 1993, US005265730A, disclosed a vibratory screen separator with uni-directional elliptical motion to the screening machine. The embodiment comprises of base with four legs and support system carrying the screen frame. The screen consists of side walls and back wall. The bottom of the two sides of the backwall is connected with two eccentric vibrators which are equal in eccentricity and are counter rotating. The elliptical motion provides good conveying, reduced impact on screen, higher screen life, good separation and higher screening efficiency.

Yinwei Tao, Patent dated Oct 31, 2012 ,CN 202506592 U, disclosed an angle adjustment device of medicine sieve moving back and forth. The embodiment comprises of the sieve box is attached with hinge point to the front end of the rack and the other end of the rack is attached to the sieve box through an adjustable screw rod placed in between the sieve box and the rack. The adjustable screw rod can be rotated which displaces the sieve box at the feed end of the sieve box and changes the angle of inclination of the sieve box. The device has high screening efficiency.

Brain Carr, Patent dated Nov 11, 2014, US 8881912 B2, disclosed an independent deck adjustable vibratory separator comprising of positive displacement mechanism at one end of the screen and a hinge point provided at the other end about which angle of inclination ‘a’ was provided to the screen deck. The positive displacement mechanism can displace the deck at the discharge end at upper or lower sloping direction with angle of inclination of ± 5 degrees, ± 15 degrees and ± 30 degrees. The embodiment provided the flexibility in changing the angle of the screen depending on the type of material.

Cuiyouquán, Patent dated Aug 22, 2012 ,CN 102641849 A, disclosed the embodiment of angle adjustable feeder which consist of the screen box which was hinged to the support at one end and the other end of the screen box was attached with pin and a plurality of pin holes provided on the front end of the support. The change in the position of the pin holes provides the wide range of variation in the angle of the inclination of the embodiment.

The efficiency of screening mainly depends on particle exposure time to the screen aperture resulting from the residence time of the particle on the deck, amplitude and frequency of vibration induced by the eccentric motion of the deck. The moisture content of the material influences the clogging of screen aperture and hence the screening efficiency.

The flexibility in angle adjustment of the screen deck provides control of the particle velocity and particle residence time. An increase in particle residence time improves the exposure of the particle to the screen aperture and hence the screening efficiency. The velocity of the particle during its motion influences the residence time. The velocity of forward motion at constant drive speed decreases with increasing deck angle in upper sloping angles. This reduction in particle velocity can be improved by increased speed of deck vibration.

The amplitude of vibration is controlled by the intensity of eccentricity of the shaft. The eccentric shaft provides the rotational force for the forward motion of the particle. The intensity of the eccentricity of the shaft is determined based on the particle size under consideration for screening. The moisture content and the physical properties such as moisture absorption, stickiness of the feed material for screening influence the clogging tendencies of the screen which affect the screening efficiency. Higher circular mode of vibration as a result of intensity of eccentricity can reduce/avoid the screen clogging tendency.

The vibrations induced by the screening machine can be reduced by limiting the rotational parts, lowering of frictional forces in the moving components.

The present invention aims at simplicity in screening/feeding system/ machine design and operations, adaptability to varying requirements of feed material changes, screening efficiency and throughput by simple adjustments of the machine operating parameters such as speed, screening deck angle and eccentricity. Designs for reducing the frictional forces in the moving components help reduce the power consumption and improved machine component life.

OBJECTS OF THE INVENTION

The basic object of the present invention is directed to a material handling system involving a vibrating screen and specifically to a screening system/machine comprising of a rigid body, screen deck fitted on two eccentric shafts driven by two synchronous motors to develop desired rotational vibration of the screen deck to ensure desired screening/feeding of the material.

A further object of the present invention is directed to a material handling system comprising embodiments disclosed herein relate to a material screening machine incorporating low friction, low vibration, self cleaning and high screening efficiency.

A still further object of the present invention is directed to a material handling system as a material screening/feeding machine having a screen deck whose angle of the inclination (a) can be adjusted in upward direction by adjustment of jack screws to control the particle residence time on the screen deck.

A still further object of the present invention is directed to providing a material screening/feeding machine having synchronized shafts drive for adjustment of particle velocity through motor speed control.

A still further object of the present invention is directed to providing a material screening/feeding machine having eccentric shafts to provide circular mode of vibration inducing particle trajectory of fixed amplitude and frequency to move the particle in the forward direction.

Another object of the present invention is directed to providing a material screening/feeding machine wherein self cleaning of the screen deck is implemented due to the amplitude induced by the eccentric shaft which facilitates efficient screening of material with high moisture ( up to 20 %) without clogging.

Yet another object of the present invention is directed to providing a screening machine adapted for usability of the screening machine as a feeder machine with zero inclination of the screen deck.

SUMMARY OF THE INVENTION

The basic aspect of the present invention is directed to a material handling system involving circular mode of vibration comprising;
a material carrier deck including a material carrier for desired handling involving said circular vibration ;

said material carrier deck attached to eccentric rotary shaft with respect to a support structure ;

said eccentric rotary shafts operatively connected to motor means enabling circular motion of vibration to said material carrier deck including said material carrier thereby favoring desired handling of material passing through said material carrier under said circular motion of vibration of the material carrier deck.

A further aspect of the present invention is directed to said material handling system wherein said material carrier is selected from a screen deck including a screen mesh or a plate material carrier.

A still further aspect of the present invention is directed to said material handling system comprising;
screen deck including a screen mesh ;

said screen deck attached to eccentric rotary shaft with respect to a support structure ;

said eccentric rotary shafts operatively connected to motor means enabling circular motion of vibration to said screen deck carrying said screen mesh thereby favoring screening of undersize material passing through said screen mesh under said circular motion of vibration of the screen deck.

A still further aspect of the present invention is directed to said material handling system wherein said screen deck is attached through a support means on two synchronized eccentric shafts fixed near the feed end and discharge end of the screen deck, one end of the eccentric shafts fixed on the screen body while other end of the eccentric shafts are coupled with speed adjustable/controlled motors.

A still further aspect of the present invention is directed to said material handling system wherein said screen deck is adapted for controlled inclination toward the discharge end with respect to the feed end preferably involving cooperative jack screws to adjust inclination of the discharge end of the screen deck with respect to the support base.

A still further aspect of the present invention is directed to said material handling system wherein the screen mesh is surrounded by side walls and back wall.

A still further aspect of the present invention is directed to said material handling system wherein said rotation of the eccentric shafts provides for the circular mode of vibration from feed end to the discharge end of the screen deck preferably the anti clockwise rotation of the eccentric shafts providing circular motion to the screen deck inducing amplitude and forward motion to the particle towards the discharge end of the screen helping repeated and longer exposure of the particle to the screen aperture thereby improving the efficiency of the material screening and particle separation including avoids clogging of the apertures due to wet feed material upto a moisture of 20 %.

Another aspect of the present invention is directed to said material handling system that include screen deck fixation and eccentric shaft fixation involving support systems with bearings to reduce the frictional forces, vibrations transmission to the screen body.

Yet another aspect of the present invention is directed to said material handling system wherein the screen deck and eccentric shafts are fitted through friction free support systems on the screen body such that it distributes equally the structural load on the shafts driven by individual drive motors there by reducing the power requirements and energy efficient.

A still further aspect of the present invention is directed to said material handling system wherein both the eccentric shafts are coupled to synchronized individual drive motors with speed control, the amplitude and forward motion of the particle controlled through the drive speed control to optimize the machine productivity and separation/screening efficiency.

A still further aspect of the present invention is directed to said material handling system comprising jack screws provided at the discharge end of the screen body facilitate lifting of the screen deck to a positive upward angular position at the discharge end of the screen helping adjust/control the residence time of the material on the screen deck.

A still further aspect of the present invention is directed to said material handling system having means for controlling screen deck angle adjustment /control including jack screws provided at the discharge end of the screen body facilitate lifting of the screen deck to a positive upward angular position between 0- 15 deg. enabling adjust/control the residence time of the material on the screen deck and particle velocity and with improved residence time of the material favoring increased and repeated exposure of the material to the screen aperture increasing the separation efficiency.

A still further aspect of the present invention is directed to said material handling system wherein the solid plate is provided to replace screen mesh on the screen deck for operation as a material feeding machine.

A still further aspect of the present invention is directed to said material handling system wherein the screen deck is adapted to be fitted with interchangeable screen mesh with selective aperture to handle different material sizes and moisture levels of the feed material.

A still further aspect of the present invention is directed to said material handling system comprising means for adjusting the eccentricity, screen deck angle and drive speed for a wide variety of raw materials including iron ore, lime stone, sand, slag, coal etc. with varying size ranges and feed moisture.

The above and other objects and advantages of the present invention are described hereunder in greater details with reference to the following accompanying non limiting illustrative drawings.

BRIEF DESCRIPTION OF THE ACCOMPNAYING DRAWINGS
FIG. 1 shows the isometric view of the material screening/feeding system/machine in accordance with the embodiments of the present invention.

FIG. 2 shows the front view and side view of the screening machine in accordance with the embodiments of the present invention.

FIG. 3 shows the front view and side view of the flange machine in accordance with the embodiments of the present invention.
FIG. 4 shows the component of the eccentric shaft machine in accordance with the embodiments of the present invention.

FIG. 5 shows the front view and side view of the screen deck holder machine in accordance with the embodiments of the present invention.

DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS
The present invention is directed to provide a material handling system as a high efficiency material screening machine or a material feeding machine incorporating circular mode of vibrations, Adjustable positive angular positioning and adjustable speed control for vibration of the screen deck. The circular mode of vibration provides necessary amplitude and forward motion for the particle helping improved exposure of the particle to the screen aperture. The screen deck fitted using a support system on two eccentric shafts ( 5 mm) with equal eccentricity, synchronously rotating in anti-clockwise direction provides circular mode of vibration to the screen deck. The screen body fitted with jack screws at the bottom of the discharge end provide angle adjustment for the screen deck in upward sloping direction ( 0-15 deg). The adjustment of the screen deck helps to adjust the residence time of the particles on the screen deck as a function of particle size and moisture of the feed material being screened for optimizing the screening efficiency. The eccentric shafts are driven by, two speed adjustable/controlled synchronous motors. The speed adjustment/ control of the eccentric shafts help optimize the screening efficiency and productivity of the screening machine.

In this present invention, the embodiments disclosed herein relate generally to the apparatus for high efficient screening of the mineral ores. The utility model is intended to provide a screening machine which overcomes all the major drawbacks of existing vibrating screening machine.

Accompanying Figure 1 shows the schematic portrayal of the new screening mechanism in accordance with the embodiment of the present disclosure. As per the detail portrayal of figure 1 the screen consist of a base 1, support system 2, screen frame 3, back wall 4, side walls 5, a screen mesh 6, flange 7, motor 8 & 9, coupling 10, eccentric shaft 11 & 12, bolt and threaded hole assembly 13 & 14, motor base 15, bearing 16 and screen deck holder 17.

Accompanying Figure 2, the front view and side view of the screening machine in accordance with the embodiments of the present disclosure. As per figure 1 and figure 2 which has different frame of reference of one portrayal to view the engineering design assembly of screen machine where, the base 1 is attached to the support system 2 which holds and supports the screen deck while in operation. The screen deck is an important assembly of whole screen machine design which consist of screen frame 3, back wall 4, side wall 5 and screen mesh 6. In present design the screen mesh is fitted through bolt and nut assembly on section 3 and 4, which can provide ease in detachment and attachment of referral aperture of screen mesh size as per operation of screening. In this novel design of screen machine the support system 2 will carry the entire load of the screen deck and also carries the load of the feed material poured on the screen deck.
The present invention in the design of screen machine, the machinery and the drive mechanism of the machine comprises of the two primitive drive motor 8 & 9 coupling 10 with two eccentric shafts 11 &12 are supported over the motor base 15 which is rigidly connected to base 1 and the support system 2, as depicted in figure 1 and figure 2. As the both the motor 8 & 9 are rotated in anti-clock wise direction which in turn rotates the eccentric shaft 11 & 12 in anti-clock wise direction. As the eccentric shafts rotate in the screen deck holder 17, the screen deck will be provided with the required circular mode of vibration. The amplitude and stroke length of the circular mode of vibration provided to the screen deck mainly depends on the eccentricity of the eccentric shaft. Higher the eccentricity in the eccentric shaft, higher will be the amplitude of the circular mode of vibration provided to the screen deck.
The support system 2 is provided with the four holes near the top most corners of the support system 2 for placing the bearing 16 on the support system 2. The flange 7 is fitted on the outer periphery of the holes in the support system 2. The flange 7 is fixed to avoid the slip of the bearing 16 from the hole during the operation. The back wall 4 and side walls 5 attached to the screen frame will reduce the feed materials flowing out of the screen deck during screening. The four corners of the screen deck are attached to the screen deck holder 17 which is supported on the eccentric shafts 11 & 12. The screen deck holder 17 with the screen deck is adjoining with the eccentric shafts 11 & 12 which are mounted on the rigid body of the screen using ball bearing 16. One of the ends of the eccentric shafts 11 and eccentric shaft 12 are coupled by flanged arrangement to the motor 8 and motor 9 respectively which forms the drive mechanism. The speed of the drive mechanism is controlled through a VFD for adjusting the speed based on the feed size, productivity and screening efficiency.

In this novel design of screening mechanism as depicted in figure 1 and figure 2, both the shafts 11 & 12 have identical eccentricity and are synchronize by position locators. However the eccentricity of shafts can be varied based on the feed size and material to be screened.

The bottom plate 1 at the discharge end as depicted in figure 2, of the screen body 3 is provided with two jack bolts 13 and 14 for lifting the screen body in positive upward angle (0 to 15 degree). The jack bolts are provided with fine pitch metric thread for precession control of the lifting angle. This facilitates change in the screen deck angle influencing the residence time of the particle on the screen deck and particle velocity. The screening efficiency can be optimized by adjusting the angle by operating the jack bolt as a function of material and sizes to be separated.
Accompanying of Figures 3, 4 and 5, depicts the component flange, eccentric shaft and screen deck holder respectively.

It is thus possible by way of the present invention to provide a material handling system involving a vibrating screen and specifically to a screening system/machine comprising of a rigid body, screen deck fitted on two eccentric shafts attached independently to two synchronized drive motors controlled through a variable frequency drive(VFD), wherein the two eccentric shafts provide circular mode of vibration to the screen deck for feeding/screening the material loaded on screen. The base of the screen body at the discharge end is provided with two jack bolts for varying the screen deck inclination (a). In the present invention the inclination angle can be varied from 0 degree to 15 degrees in upward sloping direction. The present invention provides flexibility for variations in the circular mode of vibrations by adjusting the eccentricity of the shaft, efficiency and throughput by adjustment in speed of the motor. The system ensure material screening/feeding with low friction, low vibration, angle adjustable, speed adjustable, high screen mesh life, self cleaning and high efficient screening machine. The present invention provides flexibility to use the screening machine as a feeding machine also with angle of inclination set at zero degree.