WO2015159300A1

WO2015159300A1 - Dosing system with accurate weight

Info

Publication number: WO2015159300A1
Application number: PCT/IN2014/000407
Authority: WO
Inventors: Dhirendra Himatlal MAHIDADIA
Original assignee: Mahidadia Dhirendra Himatlal
Priority date: 2014-04-19
Filing date: 2014-06-19
Publication date: 2015-10-22

Abstract

Dosing System With Accurate Weight is worked on weight base system, wherein the speed and direction of the conveyor screw fitted in servo- stepper motor is controlled by PLC circuit. In the present invention dosing system fist dose is defined manually on PLC circuit and then raw material is feed into the discharge blow earlier through course feeding and later on through fine feeding in the control manner. At the stage of accurate weight dosing material is feed in discharge bowl and load cell is online calibrating the weight accurately and send the single through the PLC controller to stop the servo stepper motor. Now pneumatic cylinder lifts or rotates the discharge bowl & discharge bowl rotates on axes which are fixed to hinge bracket and accurately weighed dose will be poured to further process to discharge chute will be ready for further operation.

Description

DOSING SYSTEM WITH ACCURATE WEIGHT

Field of the Invention

The present invention relates to dosing system with precise & accurate weight of dose. This dosing system is purely on logical base. It is purely work on "WEIGHT BASE SYSTEM" It is not on "VOLUME BASE SYSTEM or CAVITY BASE SYSTEM". The present invention will be mostly used in pharmaceutical industries, drugs industries where the accuracy of weight is must required for precise & accurate weight of dose. Further the invention is also being used in food industries, jewellery - ornaments industries and the others fields where the precise & accurate weight composition will be also require. In the present invention, dosing system worked with precise & accurate dosing weight, it will be controlled by programmable logic controller (PLC) circuit system, servo - stepper motor and load cell etc. There are two types of feeding cycles - arrangements being used in this weight base dosing system

(1) Course feeding cycle.

Feeder Screw speed is more so feeds high - more value of dosing material.

(2) Fine feeding cycle.

Feeder Screw speed is slow so feeds fine - less value of dosing material. Both feeding cycles will be feeds the raw material from main hopper to weighing bowl through the screw-augur with different speed of screw-augur (which is set on PLC) which is coupled with servo-stepper motor & rotating in to feed barrel or screw housing which is controlled by PLC. Weighing bowl is under the feed barrel discharge point and fixed on load cell. Load cell checked online weight & give signals to PLC to acts with pre loaded programmed commands.

Initially, after charging raw material in to the main hopper, First in course feeding cycle the raw material will feeds by feed screw- augur & servo-stepper motor at higher speed, as course feeding at earlier stage and later on by the same as fine feeding cycle in to dosing bowl which is under it (Speeds of screw is depends on characteristics- property of raw material & it will be controlled by pre loaded programmed on PLC). The weighing bowl has received materials which is discharge through rotatable screw in screw housing - barrel and nozzle. The load cell is provided under the weighing bowl which is checked online weight and gives signal - feed back to PLC & Servo-steeper motor which is controlled through PLC controller up to the desired weight is achieved. Background of the Invention At present most probably industries are using volume base systems or cavity base systems. The present invention also relates to a machine for performing the above method for metering or dosing of pharmaceutical products. Generally as powders into capsules or into tablets is obtained using machines in which a feeding unit called feeder fills the empty die - cavity for tablets or empty capsules where volume is a pre-determined quantity of powder - product.

Feeder is feeding raw material which is in powder form which is in different grain sizes or particles forms, says mesh sizes - granules.

There are some limitations to obtain same sizes of particles, mesh sizes - granules from sifting system say sifter machine being used for, dose. In sifting system - sifter machine is used with single deck or double deck or triple deck, means there are single screen, double screen or triple screen of different mesh sizes of screens are used; ·^■··^■'^■■ - See an example of sifter machine. We require 30# mesh sizes of granules for make tablets or capsules or for other product.

There are used different mesh sizes of screens being used to obtain 40# mesh granules (says 20#, 40#, & 60#) but outcome of powders - products with mix sizes of particles - granules as

( 1 ) 20 # and above, (2) 20 # to 40 # &

(3) 60 # and under.

So available products are from sifting device are not of the same particle sizes - granules.

To produce for same dosed products - dosed tablets - dosed capsule, all raw materials required in granules form. Now in market, the available ready powder or ready products or manufacturer - produce the said powder - products in their in-house facility or in their industries whatever, powder - products are not available of same sizes of granules- or produced of raw materials are in mix sizes of particles - granules says it is available in mix particle sizes or granules - mesh sizes.

As per Weight Formula, W = V X δ

Where, w = weight,

v - volume, ^'

S =-^■ density of raw material.

The volume - "V" is fixed by die - cavity for tablets or capsules because it is pre-defined shape & sizes of product for market or end users. Density - "<5 " of raw materials is not fixed because available powder or products are in mixed particles sizes or granules which we have described earlier. So in all die cavity for tablets or in capsule will get powder with mixed density of powder - product through feeder, so weight will be different of products - tablets - capsules with subject to each other or also in same batch because of availability or using raw materials are not of same density means not of same particles sizes - granules So end products are not of same weight because this system works on "VOLUME BASE SYSTEM" & non availability of same particle size of raw material with same granules.

Thereafter a testing unit will checks its weight on online weighing system with sorting device of tablets or filled capsules to determine statistically if the quantity of product within an acceptable range. So some of percentages of products will be in not acceptable range, so it will be rejected, so loss of value - means production cost, raw material cost, labor cost, inventory cost, stock value etc.

Mainly end user cannot get perfect, precise & accurate weighted of dosed product - tablets - capsules, and it cannot be perform to its required performance level. So performances of product - tablets - capsules for end user is not obtain up to the mark for end user what performances level prescribed by their consultant or doctor with required dose for each disease. The measurement of the quantity of product metered into the tablet or capsules is generally an indirect type of measurement and is obtained by evaluating the difference between the weight of a tablet or filled capsule, detected by the testing unit, and the average weight of tablet or capsules known from the type of tablet or capsules employed.

This method involves the disadvantage of a somewhat imprecise determination of weight, in particular when the weight of the quantity of product to be metered into the tablet or capsules is of the same order of magnitude as the weight of the tablet or capsules themselves. In fact, the tolerances of the weight of product and of the tablet or capsule can compensate one another with the result that an evaluation of the Weight of the product is obtained which is significantly less or greater than the real value.

Basically, the dosage may be made directly or indirectly by weight on a volumetric way. A known gravimetric metering is so- called loss-in-weight process in which the measured quantity is determined from a measurement of the weight of the product to be dosed containing reservoir before and after the removal of the material.

A disadvantage of this method in particular is the low accuracy because of the weighing range of the weighing device must be matched to the weight of the reservoir with content and therefore small amounts can not be determined gravimetrically with the desired accuracy in particular.

Furthermore, the dosing of various factors such as shock and vibration can easily be affected if the weighing device is attached directly to the processing machine.

To overcome such limitation, in the present invention dosing system, weight accuracy is fulfilled by weight based dosing method. The present invention relates to a method for metering or dosing of pharmaceutical - drugs product i.e. capsules or tablets or injectable in powder form.

Object of the Invention

The present invention is very simple dosing system with high accuracy of weight of dose - product.

In the present invention, due to high accuracy weight of dose, performance of drug is also improved. Mainly it is purely a HEALTH RELATE SYSTEM for human being or end user can get perfect, precise & accurate weighted of dosed product - tablets - capsules, and performances of product - tablets - capsules for end user to obtain up to the mark what end user have prescribed by their consultant or doctor with required dose for each disease. Consultants or Doctors can get performance what they want or can get perfect idea to what to do or can other conclusions do. The main object of the present invention is to provide a high accuracy of dose of accurate & precise weight by such dosing system. Another object of the present invention is to provide cost effective system for the end user of the doing system without any side effect.

Another object of the present invention is providing accurate judgment to the doctors or consultants to identity of process or say recovery method for its disease for their patient - client.

Summary of the Invention

The present invention is dosing system with accurate weight. In the present invention, raw material is charged in the main hoper, wherein the screw conveyor is connected with servo stepper motor fitted on such hoper. The servo stepper motor is controlled by PLC controller. For each dosing cycle, first dosing amount of weight is defined & manually entered that value on PLC control unit. Then the servo motor is start. In the initial stage raw material is feed through the conveyer screw into weighing bowl unit through course feeding method, the Weighing bowl is covered by isolated body and put on load cell so, when the nearby the pre-defined weight is receive, feeding method is converted into the fine feeding method. At the stage of accurate weight dosing material is feed in weighing bowl and load cell is online calibrating the weight accurately and send the single through the PLC controller to stop the servo stepper motor. So the weighing bowl received the dose with accurate weight & other device or pneumatic cylinder id delivered the said dose for further process or for further action.

BRIEF DESCRIPTION OF THE DRAWINGS

It will be convenient to further describe the present invention with respect to the accompanying drawings that illustrate possible arrangements of the invention. Other arrangements of the invention are possible, and consequently the particularity of the accompanying drawings is not intended to be limiting of the present invention.

Fig.l represents the Vertical Feeder view of the dosin

system ^■

Fig.2 represents the Horizontal Feeder view of the dosing system

Detailed description of the invention

Before explaining the present invention in detail, it is to be understood that the invention is not limited in its application to the details of the construction and arrangement of parts illustrated in the accompanying drawings. The invention is capable of other embodiments, as depicted in different figures as described above and of being practiced or carried out in a variety of ways. It is to be understood that the phraseology and terminology employed herein is for the purpose of description and not of limitation. Vertical feeder view of dosing system with accurate Wight is shown in Fig.l. The accurate doing system involve following steps

1. First dosing amount means weight of dose is enter in to PLC display & also enter of both the speed values of feed screw - augur for course feed cycle & fine feed cycle.

2. Open Inlet port (2) & Fill the raw material into main hopper (3)

3. Inlet port (2) is close after filling sufficient raw material in main hopper (3).

4. Then check the set speeds values of screw on PLC controller for course feeding & fine feeding cycle according to the properties - characteristics or flowing ability of raw material being used of the feeding systems.

5. Then checked the rotational direction of the feed screw - augur (6), whether it is clock wise direction or anti-clock wise direction, which should be depends upon flight - helix profile of feed screw - augur (6), means the raw material should be moves to weighing Bowl side.

6. Once all setting has been done, starts the Servo - Stepper Motor (1). Now servo - stepper motor (1) start to rotating so feed screw - augur (6) is also rotates.

7. Now feed screw (6) is also rotates at the speed of servo - stepper motor's (1 ) speeds because both are coupled through solid coupling (4). First cycle is course feeding cycle. When feed screw (6) rotates at in course speeds means higher speed which is set on PLC for course feeding cycle speed of servo - stepper motor (1), the raw material (5) will moves to forwarding direction through feed barrel (7) & feed nozzle (8) and will be discharged in to weighing bowl (9).

Up to desired set weight of course feeding cycle on PLC raw material (5) will discharge to weighing bowl (9) which is fixed on hinge bracket (10) through its axes, and hinge bracket (10) is fitted on load cell (11), so load cell (11) checked online weight which is set on PLC. when weight reaches to desired amount of weight, immediately it gives signal - feed back to PLC & PLC gives command to servo - stepper motor (1) for change cycle from course feeding to fine feeding cycle & it is starts work on fine feeding means slow speed, so servo - stepper motor (1) runs at slow speed which has been set on PLC previously so fine feeding will starts & servo - stepper motor (1) rotates at slow speed up to the next command - signal of stops from load cell (1 1 ) through PLC; During fine feeding cycle rotational speed is less as compared to the course feeding cycle so measurement of weight up to mark.

Raw materials (5) will discharge to weighing bowl (9) up to desired weight is achieved. Load Cell (11) is checking online weight up to the desired weight of dose. When desired weight is achieved by load cell (1 1), it gives signal - command to PLC to stop the servo - stepper motor (1) & immediately servo - stepper motor (1) stops & PLC also commands to pneumatic cylinder (12) to operate. Now pneumatic cylinder (12) lifts or rotates the weighing bowl (9) & weighing bowl (9) rotates on axes which are fixed to hinge bracket (10) and accurately weighed dose will be poured to further process to discharge chute will be ready for further operation.

10. Designs, shapes & sizes of feed screw - augur (6), barrel (7) & nozzle (8) in fig.l are being used as subjected to characteristics - properties of raw material being used, it can be inclined design also means it is as required.

Horizontal Feeder view of dosing systems is shown in Fig. 2.

Vertical or horizontal feeder view of the dosing system is selected according to the properties - characteristics or flowing ability of raw material being used.

While, the invention has been described with respect to the given embodiment, it will be appreciated that many variations, modifications and other applications of the invention may be made. However, it is to be expressly understood that such modifications and adaptations are within the scope of the present invention, as set forth in the following claims.

Claims

I CLAIM:

1. DOSING SYSTEM WITH ACCURATE WEIGHT is consists with PLC controlled system, servo - stepper motor (1), inlet port (2), main hopper (3), solid coupling (4), feed screw (6) , feed barrel (7), nozzle (8), weighing bowl (9) ,hinge bracket (10) , load cell (11) and pneumatic cylinder (12) wherein

Wherein servo or stepper motor (1) is fitted on or above or on other housing with bearings & seal for leakages to the main hopper (3) ;

Wherein inlet port (2) is provided on top of the main hopper (3) to charge the raw material (5) into main hopper (3);

Wherein the feed screw (6) is connected with servo- stepper motor (1) through the solid coupling (4);

Wherein the feed barrel (7) is lower part of the main hopper (3) to moves the raw material (5) in forwarding direction;

Wherein the feed nozzle (8) is the end part of the feed barrel (7) to discharge the raw material into the weighing bowl (9);

Wherein the weighing bowl (9) is fixed on hinge bracket (10) through its axes and hinge bracket (10) is fitted on load cell (11) or other housing of load cell (11); Wherein the pneumatic cylinder (12) or other device to lifts or rotates the weighing bowl (9) and accurately weighed dose will be poured to further process.

2. DOSING SYSTEM WITH ACCURATE WEIGHT as claimed in claim 1 wherein the dosing amount, servo - stepper motor (1) speed and direction of the feed screw (6) is controlled by PLC circuit with feed back or signal from load cell (11).

3. DOSING SYSTEM WITH ACCURATE WEIGHT as claimed in claim 1 wherein desired weight is achieved by load cell (11), it gives signal - command to PLC to run or stop the servo stepper motor (1) & immediately, servo stepper motor (1) works & PLC also commands to pneumatic cylinder (12) to operate.

4. DOSING SYSTEM WITH ACCURATE WEIGHT as claimed in claim 1 wherein designs, shapes & sizes of feed screw - augur (6), feed barrel (7) & nozzle (8) are : being used as subjected to characteristics - properties of raw material being used.

5. DOSING SYSTEM WITH ACCURATE WEIGHT as claimed in claim 1 wherein Course feeding cycle & fine feeding cycle is used to feed the raw material with screw-augur with different speed of screw-augur (6) which is coupled by solid coupling (4) to servo- stepper motor ( 1 ) & rotating in to feed barrel (7) or screw housing.

6. DOSING SYSTEM .WITH ACCURATE WEIGHT as claimed in claim 1 wherein weighing bowl (9) with load cell (11) is isolated covered to improve the accuracy of weight through the various factors such as air waves, shocks and vibrations etc.

7. DOSING SYSTEM WITH ACCURATE WEIGHT as claimed in claim 1 wherein vertical or horizontal or inclined feeder view of the dosing system is selected according to the properties - characteristics or flowing ability of raw material being used.