Title of Invention

ELECRONIC PAN TYPE MIXER

Abstract

A pan type concrete mixer assembly comprising 1. a pan mixer 2. a means for aggregate weighing and loading 3. an electronically controlled means for water weighing and dosing system in which the pan mixer comprises an outer shell 51, a base plate 2, an electric geared motor driven centrally located shaft 9, suitable number of mixing arm 11-14 fixed at one end on the shaft 9, a discharge port 30 on the base plate 2, a cover plate containing opening for aggregagate /cement and water loading and an inspection gate

Full Text

FORM 2 THE PATENTS ACT, 1970 (39 of 1970) COMPLETE SPECIFICATION (SECTION 10; rule 13) PAN TYPE CONCRETE MIXER RAKESK & ASSOCIATES a Partnership Firm Registered in India having its registered office at 105, STANFORD PLAZA, OSHIWARA, LINK ROAD, ANDHERI (W) MUMBAI, PIN-400 053, AN INDIAN PARTNERSHIP FIRM The following specification particularly describes and ascertains the nature of this invention and the manner in which the same is to be performed. TECHNICAL FIELD OF INVENTION The present invention relates to a pan type concrete mixer , particularly electronically controlled pan type concrete mixer which is useful in mixing particularly, but not exclusively, Ready Mix Concrete herein after called RMC grade concrete by using either cement or cement with an admixer , and for using fly ash in making concrete. BACKGROUND OF THE INVENTION It is known in the art, Concrete mixers having tilt-able mixing drums which are basically hollow, cylindrical in shape and are provided with a tapered constriction, such drums requiring different filling, mixing and discharge positions with regard to their axis of rotation. Mixing drum are also known which likewise use the free-fall mixing action but in which the filling and mixing positions are identical, and in this case the mixing drum, with the mixing tools mounted in its interior, rotates substantially about a horizontal axis. But this drum mixers are not useful in getting high quality concrete because there the mixing is not forced mixing but gravitv dependant. Furthermore, Pan mixers are used for mixing concrete or aggregates for concrete or other mixtures required in large batches. Normally, the pan rotates and mixing blades which are suspended above the pan eccentrically dip into the material in the pan and serve to turn it over and mix it. The blades may take the form of fixed ploughs or of blades mounted rotatably upon a head. The disadvantage of this arrangement is that the pan is a cumbrous element for rotation and discharge of the material commonly has to be accomplished by a sloping plough blade which is intended to discharge the material over the lid of the pan and discharge is usually not complete or rapid. Attempts to use rotary arms with a stationary pan have resulted in complex constructions on account of the necessity that the center of rotation of the arms must not coincide with the axis of the pan or the material would not be stirred properly, and on the other hand if the axis is eccentric to the pan, the axis must move about if all parts of the pan are to be reached. Pan mixers with rotating scraper blades are also known. But while using fly ash as a substitute for cement which is cheaply available compared to cement and is inactive material unlike cement. The fly is normally finer than cement and must be triturated thoroughly to get the initiation to act like cement. For dosing of admixers and flyash which is very light in nature and connect be mixed in any drum type mixers, since during mixing of concrete with flyash, due to the lightness of the flyash it gets stuck to the outer periphery of the drum and the dosing is wasted. The consistency of concrete depends upon the proportions of aggregates, cement and water used, and although it is usual in the preparation of high grade concrete to weigh the various aggregates and the cement, and to weigh or measure volumetrically the water, it is very difficult, as anyone who has had experience of concrete mixing will recognize, to obtain the correct consistency of the concrete mix. This is due to the variable quantity of water present in the aggregates, particularly the fine aggregate or sand, unless these are dried beforehand, which is a very expensive operation. ' The applicant now invented a concrete mixer with a simplified construction in which the material in the pan is thoroughly stirred , getting a rubbing action when fly ash is used, electronically controlled water batching and aggregate loading to ensure the concrete quality , and the operations , including the operation of discharge, are thorough and very rapid. OBJECT OF THE INVENTION It is an object of the present invention is to provide RMC quality mix within seconds, as the mixing time in the present invention is only 30 Seconds, and there by reducing the operating cost. It is another object of the invention to provide a forced type of mixing, and thereby certain quantities of cement can also be saved to get the similar strength while retaining the good quality of concrete. Yet another object is to use Admixers to get a good quality mix which could give all the advantages of using an Admixer while providing consistency in mixing. Yet another object of the invention to make use of flyash, which is now been propagated in the industry giving the distinct advantage to the Contractors of using flyash, in lieu of certain quantities of cement, thereby reducing the cost of concrete. Yet another object of the present invention is to reduce the mixing time greatly thereby smaller capacity mixer can give much higher output and to reduce the total power consumption of a given capacity of the mixer. Yet another object is to provide mixer which delivers high quality consistent concrete ideal for mixing stiff mixes for interlock tiles, hollow blocks, precast members, etc, where mix quality is of utmost importance, and to get a required strength of a block or tile Yet another object of the invention is to provide a pan mixer with electronic weighing & water batching systems there by avoid the requirement of separate arrangement for weighing aggregates & water batching SUMMARY OF THE INVENTION According to the present invention a concrete mixer particularly but not exclusively to make use of fly ash and admixers which is essentially of pan type comprises, a cylindrical outer frame to form the sides of the pan, a flat base made of steel and a wear plate attached on the base, a centrally mounted shaft in which the mixing arms are attached, the shaft are driven through a geared motor, a housing assembly for the shaft to prevent the wear and tear to the shaft, having mixing blade attached on the ends of the mixing arms with the help of pads, mixing arms are positioned in such a manner to get maximum mixing action through out the periphery of the pan, an aggregate weighing system, a water batching system and a hopper for loading aggregates with gates optionally hydraulically operated to open and put the aggregates into the pan, and a cover containing opening for aggregates , water and an optional inspection gate. The construction according to the present invention also permits of extremely rapid discharge of the material and to this end the invention comprises a pan mixer having in combination a stationary pan with a flat bottom, a mixer assembly supported from below the pan, concentrically disposed in the pan and mounted for orbital rotation therein, a discharge port 30 at optionally any side of the bottom of the pan, a door slidably disposed to control the discharge port and means for operating the door. In accordance with the invention the use of special additives in concrete or substitutes for cement such as fly ash or reinforcing materials such as iron fibbers are now made possible by use of these pan mixers. This achievements are particularly due to the simple construction and the different orientation of the mixing arms along with blades and the forced mixing effect it generates during mixing. Also the accurate dosing due to the additional features such as a load cell controlled weighing aggregate and water batching made it possible to get consistent mixing and extremely good quality concrete which overcomes the problems in the conventional mixers. The clearance between the wear plates and mixing arm is adjusted to a minimum in the order of 2-4mm and thereby getting the material scrapped or triturated between the base plate and/ or the sides of the wall. BRIEF DESCRIPTION OF THE FIGURES. The invention will be further described with reference to an embodiment shown in the accompanying drawings, wherein: Fig. 1 is an illustrative front view of the pan type concrete mixer assembly Fig. 2 is an illustrative side view of the pan type mixer assembly Fig. 3 is an illustrative cross sectional view of the pan mixer assembly Fig. 4 is an illustrative top view of the Pan mixer assembly DETAILED DESCRIPTION OF THE INVENTION WITH RESPECT TO FIGURES. It is believed that one skilled in the art can, based on the description herein, utilize the present invention to its fullest extent. The following specific examples is therefore construed as merely illustrative and not limitative of the remainder of the disclosure in any way whatsoever. The main structure of the pan 1 (Fig 1) would be fabricated out of structural steel consisting of Mild Steel Angles & Channels. The Pan base 2 (Fig 3)would be made out of a weight bearing MS plate to form the flat bottom of the pan mixer. The bottom of main shell flange 44 is fixed with the base plate2(Fig.3) with fasteners. On the top surface of the bottom plate, a bottom wear plate 3 (fig 3) made out of alloy steel are fixed in order to allow the wear and tear of the mixing to be born only on the wear plate which can subsequently replace without damaging the base plate 2 (fig 3). The wear plate 3(Fig.3) fixed on the base plates 2(Fig.3) forms the pan mixers base to take care of the wear and tear during mixing aggregates. These wear plates 3(Fig.3) can be easily removed by opening the bolts (not shown) on the periphery of the Pan structure l(Fig.l). The central mast 5(Fig.3) assembly consists of the casing pipe 6(Fig.3) on whose two ends, bearing housings 7(Fig.3) are fixed. These two bearing housings 7 (Fig.3)are machined in one setting so that both are concentric to each other, and then the Bearings 8(Fig.3) are fixed into these bearing housings 7(Fig.3), so that the main shaft's 9(Fig.3) rotation will always remain concentric. Through these two bearings a main shaft 9(Fig.3) is fixed whose outer diameters are on the inner diameters of the bearings 8(Fig.3). When the main shaft 9(Fig.3) is fixed between these two bearings 8(Fig.8) and the shaft rotates between these two bearings to give a concentric vertical rotation. At the one end of the main shaft 9(fig.3),a arm mounting plate 10(Fig.3) is fixed which rotates with the main shaft 9(Fig.3). On the top of this plate suitable number of arms 11 -14(Fig.3) is fixed on arm mounting plate 10(Fig.3) with the help of fasteners and positioned along the base of the Pan with the help of arm plates 15(Fig.4). At the end of these arms 11 - 14(Fig.3) other than the end the vertical shafts 9(Fig.3) is fixed, wear pads 3(Fig.3) are fixed with the help of nut and bolt assembly (not shown) . These wear pads are optionally made out of mild steel. The Wear blades 19(Fig.4), manufactured out of alloy steel our bolted on the wear pads 18(Fig.4) , with the help of counter sunk nut bolt (not shown) which can be easily removed when the blades wear out and need replacement. The gap between the base wear plates 3(Fig.3) & blades 19(Fig.4) are 2 to 4 mm & clearance between the housing pipe 6(Fig.3) 85 blade 19(Fig.4) which is nearer to the center of the pan is 2 to 3 mm. The wear blades 19(Fig.4) takes care of the wear and tear during the mixing and after suitable number of operation it can be removed and replaced with a new wear blade 19(Fig.4) so that the wear and tear do not affect the wear pad 18(Fig.4). The cover 16(Fig.l) on the Pan shall31(Fig.3) be fabricated out of MS sheets and is provided with an opening 21(Fig.l) for aggregate loading , an opening 22(Fig.l) for water batching assembly and another opening for an inspection gate )not shown) . The equipment has an Electric Geared motor 24(fig 2), to drive the main shaft 9(fig 3) on which the mixing blades 19(fig 4) are fixed which rotates at a desired RPM. Electrical geared motor's output has a coupling 42 & 43 with a pinion (not shown) at the other end. The function of pinion is to provide reduction in speed of the main shaft assembly where the gear wheel( not shown) is fixed. This geared motor and gear assembly reduces to the required mixing speed, to produce proper mixing of concrete in minimum time. This full Pan assembly 1 is mounted on the structure fabricated (fig.l)out of mild steel angles and channels. As explained earlier , on the base of central mast Assembly consists of a pipe 6 (fig 3) on whose two ends bearing housings are fixed,7(fig.3). Thereby the main shaft 9(fig.3) rotation will always remains concentric, and these housing pipes 6(fig.3) are fixed by the counter sunk bolt( not shown) with the base plate 2 (fig.3) so that it car. be easily removed after it has worn out due to use, or whenever needs replacement. According to the invention at the top end of the main shaft, the arm mounting plate 10(fig.4) is fixed which rotates with the main shaft 9(fig.3). On the top of this plate, suitable number of arms ll-14(fig.3) are fixed. The number of arms and the placing is designed & fixed to get appropriate mix. These 4 arms 1 l-14(fig.3) are fixed opposite to each. It should be understood that more numbers of arms may also be fixed depending upon the mix requirements and the capacity of the pan mixer according to the present invention. According to the invention Top cover of pan mixer 16 (fig.l) is fixed with fasteners on the flange 17 (fig. l)of main shell. On the top cover 16(fig.l) of pan mixer, there is additionally provided an inspection window (Not shown) to inspect the aggregates during mixing and to dose any additional material during mixing. The Hopper 20 (fig.2)assembly attached to the pan type mixer according to the invention made out of mild steel would be fixed on the load cell frame 27(fig.2) through structural steel consisting of angles and channels, and proper stiffeners, such that it can be conveniently head ' loaded. The load cell is provided to weigh the aggregates before charging into the mixer for mixing there by providing accurate amounts of aggregates. The load cell frame 27(fig.2) can weigh the aggregates with accuracy of 0.1 kg to ensure better quality concrete. The Loaded aggregates in the hopper 20(fig.2) are unloaded in the Pan by just opening the bottom lid 28(fig. 1) by turning the handle 29(fig.l) located below the Hopper 20(fig.2). The hopper can be optionally hydraulically operated through the hydraulic power pack consisting of a hydraulic cylinder, piping, hydraulic tank, hydraulic pump, electric motor, operating valves, etc (not shown in the fig), for loading of the aggregates The Hopper 20(fig.2) of suitable capacity is mounted on the load cell frame 27(figJ2) having a load cell of suitable capacity. The load cell frame consists of the support plates , pad plates, angles, fasteners, stiffeners, etc. The Display Unit of the load cell is a Micro-controller based system with a LCD display, Power supply card, control buttons, etc. which is attached on the control panel. This display works on cumulative basis for both the systems. The Display Unit is mounted on a swivel type platform, so that it can be viewed from any angle. According to the present invention a discharge gate 30(fig.4) is provided on the base plate 2(fig.3) so that after the concrete has been mixed, concrete can be discharged by Opening the gate 30(fig.4) below the Pan 1 (fig.l). Discharges Gate 30(fig.4) assembly is welded with the shell 31(fig.3) and a Pin & bush arrangement 48(fig.l) is provided for opening 8B closing operations. This gate can be manually operated through discharge gate handle 32(fig.4). After the completing of mixing, the concrete is rapidly discharged by opening the discharge gate 30(fig.4). A rubber sealing is provided at the joining ends of the discharge gate 30(fig.4) to prevent slurry leakage or water leakage. According to the present invention an electronic water batching system is attached to the main assembly. This electronic water batching system consists of a Micro controller based circuit which is powered by a Power supply cord ( not shown) and the display will be shown in an LCD (not shown). The required quantity of water can be preset in the panel, by using the relevant buttons on the panel. Once pressing the start button starts the system, it will operate the water pump on the equipment to fill the set quantity of water in the batching tank. Once the target quantity set in the panel is reached, the water pump automatically cuts off. The batched water can be drained in the pan by pressing the drain button on the control panel. By pressing the drain button, the solenoid valve operates and the drain is on. The water batching tank 33 (fig. 1) is fixed on the load cell frame which consists of a load cell 34(fig.2), support plate & pad plates (Not shown) , angles, piping, etc. the water tank is made out of mild steel, with the cover, inlet pipe 37(fig.2), and discharge pipe 38(fig.2) on whose end a solenoid wall (not shown) is fixed. Water tank 33(fig. 1) is made of MS. The function of the tank is to store water during electronic water batching, to dose the required / set quantity of water and to reduce the batch time. Water discharge from the tank is controlled by the Electromagnetic solenoid valve (not shown) and water discharges through the funnel 35(fig. 1) attached with load cell frame 36(fig. 1) in to the pan mixer. The whole system including the operations of the pan mixer , the load cell weighing and dosing aggregates and the electronic water dosing assembly are connected to a central computerized control panel and the whole system made possible to operate from the control panel. It is known to the person skilled in the art that additional features such as Admixer dozer(not shown), and printer (not shown) can be added to the pan type mixer assembly of the present invention. By using the construction as explained herein before in accordance with the invention the use of special additives in concrete or substitutes for cement such as fly ash or reinforcing materials such as iron fibbers are now made possible by use of these pan mixers. This achievements are particularly due to the simple construction and the different orientation of the mixing arms along with blades and the forced mixing effect it generates during mixing. Also the accurate dosing due to the additional features such as a load cell controlled weighing aggregate and water batching made it possible to get consistent mixing and extremely good quality concrete which overcomes the problems in the conventional mixers. It is also made advantageous in cleaning of the mixer which usually is cumbersome due to the simple construction of the mixer of the invention and the cleaning is done by simply mixing the aggregates along with water after completion of concrete mixing. We claim, 1. A pan type concrete mixer assembly comprising 1. a pan mixer 2. a means for aggregate weighing and loading 3. an electronically controlled means for water weighing and dosing system in which the pan mixer comprises an outer shell 51, a base plate 2, an electric geared motor driven centrally located shaft 9, suitable number of mixing arm 11-14 fixed at one end on the shaft 9, a discharge port 30 on the base plate 2, a cover plate containing opening for aggregagate /cement and water loading and an inspection gate 2. A pan mixer as claimed in claim 1 wherein the free end of the arms are fixed to wear blades 11 3. A pan mixer of claim 2 wherein the other end of the mixing arms are attached to the top of the main shaft 9 4. A pan mixer of claim 3 wherein the clearance between the mixing blades and the wear plates are kept minimum in the range of 2 to 4 mms. 5. A pan mixer assembly of claim 1 wherein the means for dosing aggregates or/ and cement is a hopper having slidable gates at the bottom. 6. A pan mixer assembly of claim 5 wherein the gates of the hopper are manually or hydraulically operated 7. A pan mixer assembly of claim 6 wherein the water batching system is electronically controlled to preset the amount of water to dose having an auto cutoff arrangement 8. A pan mixer assembly of claim 7 wherein the water tank is placed on a load cell by means of a load cell frame 9. A pan mixer assembly of claim 8 wherein the hopper is placed on a load cell of suitable capacity with the help of a load cell frame. 10. A pan mixer of claim 4 wherein the arms are arranged opposite to each other. 11. A pan mixer of claim 4 wherein the arms are positioned to reach the entire inner area of mixer to result in uniform mixing through out the volume of the mixer. 12. A pan mixer of claim 1 wherein the discharge port is sliding type. 13. A pan mixer of claim 13 wherein the discharge port 30 is manually operated by means of a handle 14. A pan mixer of claim 13 wherein the discharge port 30 is operated with the help of a hydraulic power pack 15. A pan mixer of claim 1 wherein the mixing arms axially placed therein the mixer housing are mounted on to the central shaft (9) with the help of arm mounting plate (10). Dated this 27th Day of April 2005 Rakesh Sharma Partner Rakesh and Associates

Documents:

14-mum-2003-cancelled pages(06-04-2004).pdf

14-mum-2003-claims(granted)-(06-04-2004).doc

14-mum-2003-claims(granted)-(06-04-2004).pdf

14-mum-2003-correspondence 1(06-04-2004).pdf

14-mum-2003-correspondence 2(30-10-2006).pdf

14-mum-2003-correspondence 3(08-01-2003).pdf

14-mum-2003-correspondence(ipo)-(06-11-2006).pdf

14-mum-2003-drawing(06-04-2004).pdf

14-mum-2003-form 1(06-01-2003).pdf

14-mum-2003-form 13(19-01-2005).pdf

14-mum-2003-form 19(04-12-2003).pdf

14-mum-2003-form 2(granted)-(06-04-2004).doc

14-mum-2003-form 2(granted)-(06-04-2004).pdf

14-mum-2003-form 3(06-01-2003).pdf

14-mum-2003-form 5(06-01-2003).pdf

14-mum-2003-other document(13-01-2003).pdf

14-mum-2003-power of attorney(06-01-2003).pdf

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