Agitating – Mortar mixer type – With dynamic delivery
Patent
1997-09-03
1999-12-28
Soohoo, Tony G.
Agitating
Mortar mixer type
With dynamic delivery
366 50, 366 68, B28C 542, B28C 716
Patent
active
060072334
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention is concerned with a mobile batching and mixing apparatus for mixtures of ingredients such as concrete, cement mortars, road base materials, asphaltic road surfacing compounds, animal feedstuffs and the like and also for transportation of particulate materials.
BACKGROUND OF THE INVENTION
The use of mobile batching apparatus and mobile mixing apparatus for concrete mixtures in particular is well known as is the use of mobile apparatus which have combined batching and mixing functions.
The most commonly employed apparatus for mixing and transportation of pre-mixed concrete and the like comprises a vehicle mounted agitator bowl which receives the ingredients for a concrete mix from a stationary batching plant and, by rotation of the agitator bowl, mixes the concrete mixture prior to and during transit to a discharge site.
Whilst generally effective for their intended purpose, there are a number of disadvantages associated with such mobile agitator bowl mixers. Only a relatively short time is available from the commencement of mixing to on site placement and as the use of chemical retardants can affect concrete quality, generally such use is restricted. This short mixing time thus limits the effective travelling radius of an agitator bowl mixer to a distance which safely can be travelled during the maximum mixing time of the concrete batch. This can be a particular problem in urban areas where a risk of transit delays due to traffic problems is a likelihood. Moreover, if the mobile transit mixer is involved in a traffic accident or otherwise suffers a mechanical breakdown, the entire batch of concrete can be lost and if this is allowed to set in the agitator bowl, this necessitates replacement of the bowl.
Accordingly it is necessary to locate a plurality of stationary batching plants at spaced locations in urban and suburban areas in order to provide effective delivery radii for pre-mixed concrete. Apart from being inefficient in terms of double handling of raw materials, this gives rise to substantial capital overheads and local inconvenience of increased vehicular traffic, dust and noise in the vicinity of batching plants.
As cities grow, town planning and environmental constraints will limit or even reduce the number of batch plants permitted in an urban environment. Already, town planning controls have placed restrictions on the location, days of operation and hours of operation. With growing constraints and competition in the industry, economic considerations have driven organisations towards larger batch plants and transit mixers with necessarily high capital investments and greater operational overheads.
With operational accuracies of larger batch plants more suited to larger transit mix batches, smaller capacity transit mixers are not well served. More importantly however, the capacity to serve a market for small to very small batches of premixed concrete has virtually been eliminated.
Generally speaking, the carrying capacity of larger agitator bowl mixers is usually maximised to carry a pre-mixed batch of about 6.4 cubic meters of concrete.
Where lesser quantities of concrete may be required, smaller agitator bowl mixers may be employed to deliver batches of, say, 0.40 to 2.2 cubic meters.
The main disadvantages of mobile agitator bowl mixers however is that in practice, they should discharge their entire load once on site and this must occur during a relatively short period of time. This can be grossly inconvenient to users of concrete mixes who require less than the predetermined mixer batch size and/or require discharge of small quantities of concrete over a prolonged period of time.
In the supply of ready mixed concrete to a site, it is customary to order an excess of about 10% over that calculated as required by the user as the cost and inconvenience of undersupply or undercalculation is too great. For example, if the quantity required is undersupplied by, say, 0.25 cubic meters, an extra delivery will be required. This can take up to one hour for deliv
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