Mr. Patel,

Have a look at this:

http://www.google.com/search?hl=de&c...btnG=Suche&lr=

Belt Scales on the Portal:

https://www.bulk-online.com/search?q=belt+scales

Reinhard Wohlbier ■

Mr. Patel,

Conveyor belt scales have been in existence since the turn of the last century. The Merrick E-310 has a patent date of 1912. Ramsey has been around since the 50's. Siemens, CST, Thayer and Schenk make good equipment just to name a few. There are a number of proven designs for belt scales.

The question that needs clarification is your desired accuracy. Is your goal +/- 1% , or +/- 0.1 %. The difference in accuracy is often determined by the application in addition to the design. You can install a certified 1/4% scale in a bad application and get poor results. Conversely you can install a production 1% scale in an application and get close to certified accuracies.

Of the designs that are on the market today, the majority are based on strain gauge loadcells to sense the weight of the belt and material, a sensor to determine belt travel and a microprocessor based controller to integrate these two signals. If you would like to discuss a specific design concept, I would be please to offer my opinion, as I am sure a number of others that read this forum. ■

Originally Posted by vikesh81

We need help to devlope accurate online weighing scale for belt conveyors.

Vikesh Patel

Exe. Engineer

AMAR FABRICATORS & ENGINEERS

Cell.: ++91 98250 40848

Why waste your time when the solutions already exist ■

Mr. Patel,

Please visit our Website http://groupintech.com/inlintech.php

INTECH GROUP OF COMPANIES is a rapidly expanding INR 160 million turnover engineering company with an established presence in the industry.

INTECH GROUP OF COMPANIES have a team of well-qualified and experienced personnel at various levels to man the key functional areas and the company is strongly believing and relying on Quality control and quality assurance systems and procedures, which are embedded into the operations. The products are also subjected to the third party inspection by agencies such as LLOYDS, PDIL, Bureau Veritas and EIL etc

For quite long in India , there has been a need for a mobile weigh bridge, which needs no foundation and which can be shifted (mobile) from one site to another, thereby saving on cost and time.

Keeping the above parameters in mind we, at Intech, have developed a weigh bridge which can be installed within a few hours on a hard level base*. This modular design weigh bridge is the result of over 70 man years of combined experience in the weighing industry. This design has been approved by the Department of Legal Metrology and will facilitate the users to install and operate the weigh bridge within a few hours.

The weighbridge is sleek, designed with light detachable modules, facilitating easy dismantling and transportation from site to site, and installation at the new site within a few hours.

The heart of any good weigh bridge is the load cells. Intech's weighbridges come with indigenously manufactured load cells,

confirming to international standards and approved by the Department of Legal Metrology. These load cells confirm to IP 68 protection class and are designed to work in 0 – 60 deg C range temperature. As the load cells are manufactured indigenously, replacing or replacing the load cells, if required, can be carried out with minimum loss of time.

Thanks, ■

Dear Mr.Patel,

We can supply the required components and help u install a scale.

Thanks & regards

V.Sundar

Newton weighing System Pvt Ltd

64/1C Bosepukur Road,

Kolkata-700042

Ph: 033 24429991

Email: newtonws@gmail.com ■

Dear Pantel,

our global service and support team can help you (Our belt scale model name is RAMSEY..)

Please contact our HQ: service.w&i.mpls@thermofisher.com

Thermo Fisher Scientific

Customer Service Representative - Service and Repair

P: +1 800-445-3503

F: +1 763-783-2525

Best Regards

Christoph Dubbert ■

Dear Friend,

How are you recently ?

This is alice from Ningbo Xinlan Electric Co.,ltd, which is one of leading factories specialized in load cell ,scale, truck scale, weighing equipment etc .Besides ,we not only can design any relate models for load cell, but also there are have a best price and good quality. If order quantity is enough ,we will give you 2% discount.

Through your web ,we found you’re engaged in this fileds(load cell),so we hope that we can establish business relations .

We can enclose some price list with photos ,if you have any interested ,don’t hesitate to tell me .we would be glad to talk in details through MSN: aliceyang1987@hotmail.com or any way you like .

We’re looking forward to your early reply .

Best Regards

Alice

Ningbo Xinlan Electric Co.,Ltd

MSN: aliceyang1987@hotmail.com

Skype: aliceyang1987

Gmail: aliceyang1987@gmail.com

Web: www.xinlandq.com ■

Originally Posted by vikesh81

We need help to devlope accurate online weighing scale for belt conveyors.

Vikesh Patel

Exe. Engineer

AMAR FABRICATORS & ENGINEERS

Cell.: ++91 98250 40848

See, look how many people have offered ready made equipment for you. No need to re-invent the wheel. ■

How would belt weigher idlers go in a skirted zone????

I have a stockpile reclaim conveyor and I want to measure the feed rates from each of the four feeders above it.

I guess o could use a nuclear measuring device or a laser described above, but I don’t need high accuracy so 1 weigher idlers would do the trick but the skirts are a problem?

Advice would be much appreciated ■

Hello,

You are correct in not wanting to place a belt scale under a skirted feed point. As the product gets under the skirts, it applies more load to the scale than its own mass. Kind of like a rock in your shoe! I saw a presentation from a company that was blending products by using a proportional mass flow gate with a single belt scale. The belt scale was placed out side of the skirted area and the gates were tuned to the belt scale. You may want to take a look at:

http://www.wohwa.com ■

Have a look at this one:

Truck Scale Software - Scaleit W8

Our mission is to be the industries’ #1 choice of weighing software in waste, aggregate and bulk weighing solutions!"

Scaleit W8 is a new and revolutionary concept in measuring software for weighing operations in the U.S. Our software is offered as a free download where costumers pay only as they use the software, making it both an economical solution for smaller operations and a cutting edge package for the largest! Our goal is to offer the easiest to install and operate weighing software on the market, with no up-front investment and low annual operating cost. ■

Well it's a good source of information about online weighting scales. A lot of online sources are available with different offers. ! ■

Originally Posted by vikesh81

We need help to devlope accurate online weighing scale for belt conveyors.

Vikesh Patel

Exe. Engineer

AMAR FABRICATORS & ENGINEERS

Cell.: ++91 98250 40848

Hi Patel,

your scale batch weighing or Dynamic weighing ? what is the accuracy of belt scale ? which interface do you want ? interface with PC (data base ) or HMI ?

proper load cells you can get FLINTEC / AVERY /PT / SIEMENSE . they aslo have good indicators (siemense offer SIVEREX MODULE for weighing ) , these have various protocols (RS 485 , Ethernnet , etc ,)

regards

uditha kohowala

uditha@sigmatechnologies.lk

0094777795305 ■

Originally Posted by udithausk

Hi Patel,

your scale batch weighing or Dynamic weighing ? what is the accuracy of belt scale ? which interface do you want ? interface with PC (data base ) or HMI ?

proper load cells you can get FLINTEC / AVERY /PT / SIEMENSE . they aslo have good indicators (siemense offer SIVEREX MODULE for weighing ) , these have various protocols (RS 485 , Ethernnet , etc ,)

regards

uditha kohowala

uditha@sigmatechnologies.lk

0094777795305

Hi

you can watch fallowing webinar , you can get lot idea

http://uk.mt.com/gb/en/home/events/w...echnology.html

regards

uditha ■

Hello,

Firstly obtain the information about belt weighers by studying the catalogue / leaflets, website, etc. of belt weigher manufacturers. Then, try to learn from these about the arrangement, working and important components of belt weigher.

Primarily it consists of weighing platform as a part of belt conveyor straight portion. The weighing platform is constructed such that it is stable in direction - X and direction - Y, but free in direction - Z to press vertically down on load cells. This pressing force is due to total weight of weighing platform (Self weight + Belt weight + Material mass on belt). This enables to know material mass Mm per metre of belt length. The belt weigher also include a sensor to measure belt velocity - v. Product Mm x v signifies quantity flow rate, which is converted into appropriate units say mtph. In case of incline installation, the influence of cosine factor is to be accounted. The belt weigher should also have facility for calibration.

The belt weigher is designed and constructed by mechanical engineer and electronic engineer.

After making your belt weigher, you have to test it for performance, in a running belt conveyor.

Try to get the permission from conveying system owner, to install it in one of their conveyor, for trial and performance. He may allow freely or charge money. Preferably such conveyor to also have earlier belt weigher for tallying and cross check. The belt weigher so made should conform to applicable accuracy standard, as a final result.

Now after studying the various issues, expenses and sales aspect; decide whether to develop item by yourself, or to opt for technical - arrangement / collaboration with some existing maker, for tried and tested design - construction.

The first rule while developing any commercial product, is to thoroughly study and understand the existing products in market and move forward from that point, avoiding temptation for re-invention.

The reply is more as a general information about such issue of product development.

Regards,

Ishwar G. Mulani

Author of Book: Engineering Science And Application Design For Belt Conveyors (new print November, 2012)

Author of Book: Belt Feeder Design And Hopper Bin Silo

Advisor / Consultant for Bulk Material Handling System & Issues.

Pune, India.

Tel.: 0091 (0)20 25871916

Email: conveyor.ishwar.mulani@gmail.com

Website: www.conveyor.ishwarmulani.com ■

Dear experts,

To check and to calibrate the existing on line weigh scales of conveyors, drop test is more preferred than chained rollers method.

A) In the drop test, a known amount of bulk material is fed on the conveyor and the weigh scale reading is checked. If its reading and the known weight are same, weigh scale is certified as normal or correction factor is provided in the weigh scale, if it is within acceptable limit.

B) In chained roller method, a known weight of chained roller is placed on the weigh scale zone and conveyor is operated for some time. Since weight of the chained roller & velocity of the belt is known, the theoretical TPH ( tonnes per hour ) and weigh scale reading should match.

Though chained roller method is faster, drop test method is more preferred. I could not find the reason for the same.

Kindly post your opinions for the reason.

Thanks & regards to all, ■