Vibration R&D Corner

David Strong

How to Design and Size a Vibratory Feeder Conveyor Based on Application Requirements

David Strong
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Similar to vibratory tables in their many uses and applications, vibratory feeders are also great problem solvers.  Well known for their ability to effective move material from point A to point B, a well-designed vibratory feeder offers flexibility to the end user to get the task done.

vibratory feeder, vibratory conveyor, rendering vibratory feeder

Figure 1. Air Powered Vibratory Feeder Conveyor

Feeders can range from small base mounted CF-A, pneumatic powered feeders moving small quantities dry bulk material in a controlled manner to much larger base or cable supported EMF, Electro mechanical feeder, conveying literally tons of material an hour. Off the top of my head a short list of materials that Cleveland Vibrator’s vibratory feeders have worked with would include: almonds, crushed limestone, shelled corn, powdered metal, metal billets, various pipe fittings, scrap brass and bronze, crushed and shredded automobiles, hot dross and much more.

Typically, a feeder application will require the movement of some given amount of material with a known bulk density over a desired distance. Read More…

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David Strong

Installing Vibratory Aids on Equipment: What Are My Options?

David Strong
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It seems to me that most applications start with a problem to solve; improve a process, simplify an operation, increase yield or throughput, or remove a bottleneck.  This problem could be as simple as placing the appropriately size pneumatic piston vibrator on the size of a hopper.  It could entail getting the right air cushioned vibrator such as the 1200 VMSAC or maybe a single impacting SI vibrator along with the matching SMP mounting channel and controls.  Or the problem could be more broad with concerns regarding the process or task to be accomplished and the design envelope into which the solution must fit and then interface with other equipment.

Regardless of the problem, options and choices are always good. 

cleveland vibrator vibrtgory conveyor, electric vibratory conveyor, electric vibratory feederOften with equipment one of the first things that comes up in initial discussions is the design height or discharge height of the unit.  With vibratory feeders (EMF) and screeners (EMS)
there’s always a concern of the product discharge height, as the equipment is often feeding material downstream to other devices.  One of the options that impact the design and therefore the height of the unit is the location of the vibrators.  Typically on vibratory feeders and screeners the default Read More…

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David Strong

3 Variables to Consider That Influence Material Flow from Vibratory Hopper Feeders

David Strong
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When it comes to vibratory equipment and end user requirements, Cleveland Vibrator has worked with customers that span the range from simply wanting to move material from point A to point B and they’re not terribly concerned with much more than that goal.  Other customers use vibratory equipment to provide bulk material to downstream processes and are looking for more precise control of the material flow.

Recently I had the opportunity to visit a local customer and assist him with setting up a recently completed hopper-feeder unit.  This customer’s goal was to place a dry material into plastic trays while the plastic trays moved on a conveyor belt under the vibratory feeder.  Precise metering of the dry material into the trays is critical to this customer’s success.  As I worked with this customer and our equipment it seemed to me that this would be an excellent basis for a discussion of material flow and what parameters impact the control of the flow. As mentioned the equipment provided by Cleveland Read More…

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David Strong

Manufacturing Solutions, From Start to Finish.

David Strong
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Cleveland Vibrator recently added a new employee in the Fabricated Equipment area of the company.  At the end of 2015 our CEO declared that 2016 would be a “year of investment” here in terms of both people and equipment.  It’s exciting to see this sort of thing happening, good people coming on board as well as some new CNC equipment on the immediate horizon.  It all makes Cleveland Vibrator a better company.  While getting to know a bit about our new guy in the Fab area, we talked some about his work experience and the opportunity at Cleveland Vibrator.  One of the things he already likes about the position is that he gets to see a piece of equipment completely manufactured, start to finish.  I told him that’s one of the things that I’ve always enjoyed about my job, getting to be involved with the complete process often starting with the solution concept generation phase to final testing of that solution prior to it shipping out to the customer.

I think most engineers are problem solvers and that’s one of the aspects of this profession that they find interesting and rewarding.  That’s certainly the case for me.  I’ve always found the diversity of Cleveland Vibrator’s customers and their problems very interesting.  Plus, I feel that we have a very “intimate” manufacturing process, it’s all here in one location.   Whether it’s the manufacture of a pneumatic piston vibrator, as an example the 1300 VMSAC, air cushion vibrator piston vibrator or a large vibratory feeder Read More…

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David Strong

What’s the Difference Between Attached & Unattached Volumetric Hopper Designs for Vibratory Equipment?

David Strong
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Generally speaking, in life, choices are a good thing.  This applies to industrial vibrators and vibrating equipment as much as it does for lunch time options.  In terms of fabricated vibratory equipment, Cleveland Vibrator offers a variety of solutions to processing and material handling problems.  Regardless if the need is for a vibratory feeder, screener, compaction table or vibratory belt table, our sales and application folks are up to the challenge of solving the particular needs and requirements of our diverse customer base.  As I mentioned in earlier blogs, when it comes to vibratory equipment, one size in fact doesn’t fit all.  Rarely do one customer’s particular requirements match up exactly with another customer’s, the solution may be similar in type but not in exact physical size.  Tailoring to meet the individual needs of each customer is part of the Cleveland Vibrator fabricated equipment DNA.

One of the many types of fabricated equipment manufactured by The Cleveland Vibrator Company is the volumetric feeder.   Internally, they are generally referred to as Hopper Feeders, RFM, these units can be pneumatic or electric powered.  The key design element is that a vibratory feeder has a storage hopper associated with it which accepts and stores dumps of material and then feeds the material out of the hopper in a controlled manner.  Read More…

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David Strong

Turbine Vibrators, Views from the Way Back Machine…

David Strong
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February 27, 1958
Engineering Department
Fafnir Bearing Company
New Britain, Connecticut
Gentlemen:
Submitted herewith is a sketch of a proposed bearing application.  This device is an industrial vibrator for use in handling sand, dusts and powders. The use of an eccentrically loaded turbine to product vibrations is novel to my knowledge and it produces some novel bearing problems. The device is designed to produce vibration, an action which is usually very guarded. A model of this device has been made and tested.  It has the nominal dimensions shown and runs approximately………
Yours very truly,
The Cleveland Vibrator Co.
Frank K. B…….
Professional Engineering Consultant

Read More…

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David Strong

Measuring “Force Output” of the (SI) Single Impact Air Knocker Series

David Strong
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Recently one of our sales team reps was working with a potential customer on a Single Impact (SI) vibrator application.  At some point in the conversation the issue of force output of the unit came up and there was some comparison with an unknown competitor’s model.

I’ve written at least a couple of blogs talking about documenting the performance of piston vibrators, both air cushioned and impact piston pneumatic vibrators.  One of the big questions is what is a meaningful “number” for the force output and how do we arrive at that number.  For an air cushioned piston vibrator, as mentioned before it’s pretty easy, data can be collected and calculations made.  Impact units such as the 1200 VMS present a few more wrinkles but again, I think we’ve got a reasonable method of documenting the vibrators Read More…

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David Strong

How to Adjust the Eccentric Weight on Rotary Electric Vibrators

David Strong
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In a recent blog I talked about the importance of “Counter rotation and synchronization” in the successful operation and maintenance of a piece of Cleveland Vibrator Company’s vibratory equipment. In that blog I briefly touched on the procedure to be followed when adjusting the eccentric weights on a rotary electric vibrator.  The procedure to set the weights correctly is rather straight forward but given how critical the proper set up is to the operation and the longevity of the unit to which the vibrator is attached, I decided to devote some additional time to this topic.   This will give me an opportunity to go more in depth with a step by step procedure.

First a bit of math to help get a better understanding of the importance of the weight setting and its impact on the operation of the vibrator itself and more importantly on the piece of equipment.  Any type of rotating vibrator, that includes rotary electric (RE), ball vibrators or turbine vibrators generate their “vibratory force” by rotating a mass about the center of the unit or shaft in the case of a rotary electric vibrator.  The force produced is dependent on three parameters:

  1. Weight of the rotating mass
  2. The distance of the center of gravity of that mass from the center of rotation and
  3. The rotational speed

Read More…

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David Strong

Self Help: How To Check If Your Rotary Electric Vibrators Are Working Properly

David Strong
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Counter Rotation and Synchronization.

The Cleveland Vibrator Company manufactures a complete line of vibratory equipment.  The product line includes a variety of vibratory table configurations including flat deck, FA, vibratory grid tables, GT, and vibratory belt tables, BT, along with Electro-mechanical feeders, EMF and Electro-mechanical screeners, EMS, units.  The majority of these units, perhaps 97% of what is built and sold, are of the general “Brute force” design type.  This broad design category is based on the principles of counter rotation and synchronization when applied to two electromechanical rotary electric vibrators.

Counter Rotation – Brute force units require the use of two rotary electric vibrators.  When mounted to a rigid structure the two vibrators will “sense” the presence of the other vibrator and make an effort to run together at the same speed.  To produce linear force with two vibrators, which when operated alone produce a rotational or centrifugal force vector, the pair must run together and Counter Rotate.  When mounted side by side and viewed from the end, one vibrator must run clockwise and the other vibrator must run counter-clockwise.  In typical applications it isn’t important which vibrator runs in which direction, it’s just critical that the two run in different directions.  When running properly and in opposite directions, the forces produced by the two vibrators cancel each other except for two times in a cycle with the eccentric weights of the vibrator both point in the same direction.  With the Cleveland Vibrator line of three phase powered rotary electric vibrators, changing the direction of rotation on one of the vibrators is as simple as “flipping” two of the power legs of the vibrator.  Refer to the attached diagram regarding counter rotation and force cancellation. Read More…

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David Strong

3 Ways To Measure The Strike Force Of A Pneumatic Vibrator

David Strong
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Recently the sales team forwarded the following question from a customer –

“We use some of your impulse piston vibrators to fill molds with powder. Do you have a recommendation for a way to measure the strike force such as a G-force meter or Accelerometer? Any ideas you have would be greatly appreciated.”

This seems like a pretty straight forward question but upon closer inspection, it gets a bit more complex.  So let’s break it down and look at the pieces of the question.  It’s always important to make sure we’re on the same page in our understanding of the question and terminology used. Read More…

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