US 1872892 A
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Patented Aug. 23, 1932 WED STATES PATE PAUL KRAMER, OF NORTH HOLLYWOOD, CALIFORNIA MECHANICAL SAND WASHER Application filed J'une e, 1930. seri l No. 459,537
This invention relates to mechanical sand washers or machines designed to wash foreign substancefrom sand, and'p'repare it for marketing In practice, where large quantities of clean sand are required, it is customary to wash the sand by means'of a mechanical arrangement, whereby the sand is worked through a bath of water, is finally delivered fromthe water as a clean sand product. The type of malchines used for this purpose consistsof an inclined trough arrangement, leading from the water bath, with a plurality of drag blades arranged within the trough to reciprocate and draw the sand out of the water and up the inclined trough, The objection to this arrangement is the fact that as the 'drag blades pull the sand up the incline, the sand, after leaving the water, is still so thoro-ughly saturated with water that it is in a more or less plastic condition, and as the blades leave the sand to return for another load, the piles of sand will flow or recede to a great extent downwardly to its-original position, and, as a result, the efficiency of the machine is greatly reduced.
A further objection is raised with respect to the water content of the final product. a
With thepresent equipment, the sand delivered at the upper end of the inclined trough contains a high percentage of water. In some cases this vwet sand is delivered directlyinto trucks which convey it to the job. However, since the sand still contains: so
of time and adding to the cost of transport-ation. In other cases, the sand is deposited from the upper end of; the inclined trough onto a conveyor belt, and then conveyed to storage bins where it is allowed to drain.
The plastic condition of the saturated sand again raises a serious objection, in that excessively broad belts must be used in order to much water, it drains from the truck and accommodate the spreading of the sand,'and
even then it willrun off the edge of thebelt and into the bearings for the rollers. Furthermore, in arrangements of this type, provision must be made to handle the drainage water after the sand is stored in order that trucks may approach the bins for a load. Perceiving that these objections could besubstantially eliminated, andthe output o-fthe machine increased I conceived'the idea of draining the sand before it left the machine by providing water drains in the drag blades which would permit the water to compress from the sand and pass through the blades on the upstroke. This operates effectively and efliciently to produce a drier sandproduct on each: successive stroke, since the-sand,
while being forced'up the incline, is in an ideal state for dewatering. This result isia final product of comparatively dry sand.
Accordingly, it becomes an objeot ofthis in-.
- vention to provide drag blades in mechanical sand washers of the character described with perforations either in the nature of 'holesor screening in the body of the'blade to drain water during the operation ofdragging the sand up the inclined trough.
A noteworthy feature of my invention consists in countersinking thehol'es on the-side of the blade opposite the sand. This results in producing openings through the 1 blades that are free from clogging, and-remain substantially self-cleaning. Accordingly, it'be- 7 comes a more specific object of this invention to provide drag blades having countersunk holes therethrough. j
- Other objects and advantages .will become apparent as thedescription proceeds in conjunction with the drawing in which 7 Fig.1 is a sectional view showing my'inventionalmech anical sand washer the drag blades showingimore' clearly my invention;
; Referring to the-drawing, and particularly Fig. 2 is an enlarged fragmentary view of oo vention embodied in combination with a con Fig. 3 is a section taken on line 33 of Fig.
to Fig. 1, I have illustrated a conventional sand washing machine. Such. a machine usually comprises a water tank A for washing the sand, an inclined trough B oined to the water tank in a manner to receive the sand from the waterv tank and a drag blade arrangement generally designated C. The drag blade arrangeinent is mounted upon superstructure 11 by means of links 12 and bell cranks 13. Means is provided for reciprocating the drag blade arrangement G within the trough B to drag sand from the water tank A up theinclined trough, such means consisting of a double eccentric shown at 14:, and, having connected therewith a pair of connecting rods 15 andl6. The connecting rod 15 is arrangedto lift the dragiblades on the return stroke by moansof the bell cranks 13 and the links 12,
and therodlG is arranged to'reciprocate' the drag blade arrangement, the two -1no vements being so synchronized that the drag blades will operate todiaw sand up. the incline and will return in an elevated position formanother load of sand. The sand, consequently,
.is left in smallp-iles onthebottom of the in- .elined trough. lVhenthe sand is worked up Inclined trough B: .to the point. 17,.it is dropped either into a truck, a conveyor systern, or a storage bin- .cifioal-ly' describing this embodimentof: my in- :vention; it is? observed that the drag blade arrangcmont is equipped with a pair of channel irons, shown at 18'and 19; Attached to the members .18. and '19 are a plurality of drag -=bla.des-- designated 20; The nieansof attachhig-theblades 20 cc the-"channel irons: 18-.a.nd 19 consists. of a member 21, which, in this-instance, is a piece-of angle iron bent at right angles. to folin- 22 and 23. The; leg .22 is attachedto thelower side of the channel 18' by 'means of a bolt 24, and the leg QSisutilized for mountlng the blade 20 by means ofbolts 25. A brace member QG-extendsfrom the lmvcr bolt25to=the loweredgc of the channel ironldandisattaehed thereto by means of a bolt 27. It is to bev understood thatthesame structure is utilized in connection with the channel iron.19.- This strt-tcturewill be recognized-asproviding a rigid mounting for-the a blades20'. As before stated, the purposeof this mventionais to provide in theblades'QO a .means of dewateni-ng the sand? as itis dragged up the incline. 1 The preferred means is shown in Figs. 2 and3, and consists of holes 28 wthroughthe'hody of the plate.
In Fig. 4;, I have shown another formwhich consistsofincorporating a screen 29. for the main body of the blade.
. In practice, I have found that holes of'uni- 7 form bore have a tendency to clogan-d reduce theefficiency of my invention Accond-in-gly,
the sand up the inclined trough B, the sand accumulates in front of the blade somewhat as shownat 30. It is understood that as the sandleaves the tank A, it is thoroughly saturated with water, and that unless the water is given an o portunity to drain out of the sand, thesan w-ill'be in such a plastic condition that as the blade leaves the sand in a series of piles in the trough and returns on its downwardstroke, the sand, due to gravity,
will flow downwardly with the blade and the etficiency of the machine will be greatly reduced. WVith my invention, alargepercentage ofthe waterin the sand in front of the blade is allowed to compress out of the sand and pass. through the holes 28, whereupon it 35 flows downwardlyover: the back of the blade" and will flow down the troughunder the piles of sand and back into the tank A. The re- The final'product is delivered over the end 17 of. the trough B in a. comparativelydry state. Not only this benefitachieved, but also is .eachpile of sand successively dewateredand. 5
left. in a drier condition, whereby it will-bet vter maintainits position as the blade'leaves it. for the return stroke. This clearly increases the efficiency of the machine, since the blade-on thevupstroke is enabledto pick up a oo greater load ofsand.
The. foregoing advantages will be recognized asa result of my invention.
Although I have shown drag blades equipped with holes and with screens, never-.
is intended to include drag blades. of the na- 116 true described having openings therethrough adapted to pass water.
I claim as my invention: In a mechanlcal sand washer havmg an 111- clined trough with drag blades adapted to drag sand upthe trough: means associated with said blades for dewatering the sand'as it is forced up the inclined trough, said means embodying holes through said blades adapted to pass water and restrain sand, said .holesbeing countersunk on the side opposite