AU603254B2

AU603254B2 - Apparatus for the preparation of mortars

Info

Publication number: AU603254B2
Application number: AU21874/88A
Authority: AU
Inventors: Herve Johannes Wilhelmus Janssen; Wilhelmus Gerardus Elisabeth Janssen
Original assignee: FRAMIX BV
Current assignee: Nch Silo Products Bv
Priority date: 1982-04-30
Filing date: 1988-09-05
Publication date: 1990-11-08
Anticipated expiration: 2003-04-29
Also published as: ATE23288T1; SG68189G; FI75518C; EP0093473A3; DK183683D0; FI831422L; EP0093473A2; EP0093473B1; FI831422A0; DK156546B; JPS58222257A; HK101789A; NO831478L; AU1406483A; AU2187488A; DE3367348D1; MY102398A; FI75518B; DK183683A; DK156546C

Abstract

A process and apparatus for the preparation of mortar from an aggregate and a binder is disclosed which comprises the use of a silo provided with at least one partition so as to create in the silo two or more compartments for the separate storage of the aggregate and the binder, the compartments being provided with conveyor screws, the speeds of which can be adjusted to control the volumetric flow of the components to a mixing chamber. A metering valve for water may also be connected to the mixing chamber. The silo compartment for the aggregate may be provided with a heating element to safeguard the mechanically operated slide valve against freezing. The conveyor screw in the outlet for the binder may be provided with a cam and a plunger rod with transverse projections to prevent arching in the compartment for the storage of the binder. The apparatus may be mounted on a truck to facilitate transport to the building site.

Description

S F Ref: 71543 FORM COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 COMPLETE SPECIFICATION

(ORIGINAL)

FOR OFFICE USE: Thscocim ent c on taiins thec amendiients m-iade und,, Section 49 aiid i 4 rc, Class Int Class 044' 44 4 4 4 *044 44 4 44 o 4 4 44 4 4 4 4 4~ Complete Specification Lodged: Accepted: Published: Priority: Related Art: Name and Address of Applicant: -W-ilhe-lmu-s--Gerardu s ,El i sabe,,th Jansselm__ Ubroekweg 39,41 5928 NM-Venl-Blerick (L) -TH-E-NE-T-HERLAN S- ,H~er-ve--Johannes--Ni 11ihelmus -Jan ssen---~- Ubroekweg.' 39-41 5928 NM Venlb-,Bl.arick (L)

LJTHE-NETHERLANS,.--.

Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia 4 4 044 Address for Service: Complete Specification for the invention entitled: APPARATUS FOR THE PREPARATION OF MORTARS The following statement is a full description of this invention, including the best method of performing it known to me/us 5845/3 The invention relates to a process and apparatus for the preparation of mortar, such as jointing mortar..

It is known that ready-made mortars can be prepared in a mortar plant where the aggregate, binding agents and water are weighed out for a definite batch and then conducted to a mixing chamber. The product is referred to as wet mortar to which a retarder can be added in order to keep the mortar workable for a longer period. The wet mortar is conveyed to the building site by trucks having rotating (mixing) drums mounted on them.

It is also known that dried and premixed mortars can be prepared in a special drying and mixing plant, whereupon the dry mortars are transported to the building site by bulk lorry. At the building site the dry mortar is dumped into a storage bunker positioned over a mixing device for mixing the dry mortar with water so as to obtain a workable mortar.

The known processes and apparatus have the following drawbacks: The aggregate must be predried in order to obviate partial hardening with the previously mixed binding agent, a rather costly step in view of the expenditure of energy.

As the aggregate is not completely dry in actual practice, the dry mortar has only limited keeping qualities.

The completely weighed-out batch from the storage bunkers must invariably be mixed with water, which leads to waste of mortar not needed for immediate use.

It

I

2 1 -2- It is the object of the present invention to overcome one or more of the problems and/or disadvantages of the prior art.

In one broad form the present invention provides mortar preparation apparatus for preparing mortar on a building site, comprising: a silo with a funnel shape section defining a lower portion thereof; a support structure comprising legs adapted to support the silo in an upright position during use on the building site, and a side frame to support the silo on its side during transportion to or from the building site; said silo comprising at least one partition to define individual enclosed compartments for the separate storage of an aggregate and a binder, each of said compartments having an outlet in said lower portion of said silo; a first screw conveyor communicating with the outlet for the aggregate, and i r* nrt n rA l.l r ll ,v mm,,\n-n r.l>4kh 4-hk 1 -I F 4 k l Ahlnrl U ULC UIIu ZHI UP .uIIV CYUI L IIIIIIUIIlO.LIIy VI LII LI 1 ULICL I I LIIC UIIIKI wherein said screw conveyors are adapted to convey said aggregate and said binder to a separate mixing chamber disposed below said silo and provided with a mixer having an axle which also forms the axle of said first screw conveyor, and mixing blades attached to said axle; and wherein the operating speeds of said conveyors are relatively adjustable to selectively control the mixing of said aggregate and said binder.

*1 as t

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RLF/l 551b 3 The said mixing chamber may be provided with a metering valve for water discharging into it. Furthermore, the silo may be designed such that it can, with fittings and accessories, be loaded on a truck and conveyed as a container.

The advantage of this design are that it permits a compact storage with a volumetric adjustment of the amounts of aggregate and binder; a simple metering of water; efficient transport of the silo to the building site with the aid of special container trucks.

In addition, the outlet for the aggregate may be provided with a mechanically operated slide, safeguarded against freezing fast by heating, with a further heating element mounted high up in the silo compartment for the aggregate, so that in the even' ol slight night frost jamming of the slide and clogging together of the aggregate can quickly be undone through heating.

Moreover, in order to pr(.vent any arching in the binder, the shaft of the conveyor screw for the binder has been proveded with a cam against which a plunger rod rests; this rod terminates in the binder compartment and carries transverse projections.

To elucidate the invention, an embodiment will be described by way of example, with reference to the attached drawings, where Figure 1 shows a top view of a silo; Figure 2 shows a front view of the silo; Figure 3 shows a lateral view of the silo; -4- Figure 4 presents a detailed view of two conveyor screws and a mixing chamber, drawn to a larger scale than in Figure 3; Figure 5 presents a detailed top view, also drawn to a larger scale, of the conveyor screw for the aggregate and the mixing chamber following the section at III-III in Figure 3; and Figure 6 is a lateral view of the mixing chamber.

The apparatus comprises a silo 1 with a funnel-shaped section 2 which is provided with an undercarriage 3. Undercarriage 3 provides a base to allow transportation of silo 1 when the vertical axis of silo 1 as depicted in its orientation in Figs. 2 and 3, is rotated through 900 to a horizontal orientation. The silo is divided by means of a partition 4 into the 0 compartments 5 and 6. Compartment 5 has a filling hole 7 for the aggregate o and compartment 6 a filling hole 8 for the binder. At the bottom of the 4 funnel-shaped section 2 there is a conveyor screw 9 with a mixing chamber constant speed of rotation. At the bottom of compartment 6 a second O conveyor screw 12 is mounted which communicates through a transfer line 13 with the mixing chamber 10. The conveyor screw 12 is driven by an electric motor 14 with infinitely variable speed regulator. The mixing chamber is provided with a branch 15 which has a metering valve for the supply of water.

Mortar of the desired composition is prepared in the following way.

From compartment 5, aggregate passes onto the conveyor screw 9 which transports the iggregate at a constant speed to the mixing chamber 10. At the same time, the binder is led from compartment 6 to the second conveyor screw 12 which transports the binder also to the mixing chamber 10 through line 13. The conveying speed of the conveyor screw 12 can be selected at will with the aid of the infinitely variable speed regulator of the electric motor 14. The magnitude of the adjusted speed at which the second conveyor screw 12 is driven should be determined experimentally in such a fashion that the desired mixing ratio of aggregate to binder for the jointing or concrete mortar is obtained. The speed of the conveyor screw 9 and the mixer in mixing chamber 10, however, remains constant at all times.

A* RLF/l i ~_1111__12~ Mortar can be prepared in the way outlined above by a continuous process. Dosing of the aggregate and the binder can be effected without valves. In consequence, the two conveyor screws 9 and 12 fulfil the dual function of dosing and conveying.

The outlet at the bottom of the aggregate compartment can be closed with a slide 20 in order to permit the mixing chamber to be emptied. After slide 20 has been closed and the supply of binder stopped, the mixing chamber 10 is emptied and flushed clean with water.

o000 00 o To permit operation of slide 20 in frosty weather, an electric heating 10 cable has been mounted near the supporting edge of the slide. In addition, a heating element 21 is provided high up in the aggregate compart- 0:o o ment so as to eliminate or prevent any clogging together of the aggregate.

o aArching in the binder compartment is obviated by the provision of a 0 15 plunger rod 16 with transverse projections 17 moving up and down in the said compartment. Up and down movement of the rod 16 is brought about by Q *means of cam 18.

o0e i.

Claims

1. Mortar preparation apparatus for preparing site, comprising: a silo with a funnel shape section defining a 1I a support structure comprising legs adapted to upright position during use on the building site, and support the silo on its side during transportion to o site; said silo comprising at least one partition to enclosed compartments for the separate storage of an binder, each of said compartments having an outlet in said silo; a first screw conveyor communicating with the o aggregate, and .a second screw conveyor communicating with the wherein said screw conveyors are adapted to con' o said binder to a separate mixing chamber disposed beli with a mixer having an axle which also forms the axle conveyor, and mixing blades attached to said axle; and wherein the operating speeds of said convey adjustable to selectively control the mixing of said binder.

2. Apparatus according to claim 1, further co metering means to allow metering of water into the mi

3. Apparatus according to claim 1 or 2 wherei comprises two straight elongate members mounted to th said members being parallel and spaced, and generally portion of the silo to the base of the legs.

4. Apparatus according to claim 1, 2 or 3, whe the aggregate is provided with a mechanically operate open or close the outlet for the aggregate.

Apparatus according to any one of claims 1 heating element is mounted in the silo compartment fo'

6. Apparatus according to claim 2, wherein thi conveyor screw for the binder has a cam which acts ag; and wherein said rod extends into the binder compartmi with transverse projections. s mortar on a building ower portion thereof; support the silo in an a side frame to r from the building define individual aggregate and a said lower portion of utlet for the outlet for the binder; vey said aggregate and ow said silo provided of said first screw ors are relatively aggregate and said mprising valve xing chamber. n the side frame e side of the silo, extend from an upper erein the outlet for d slide to selectively to 4, wherein a r the aggregate. e shaft of the ainst a plunger rod ent and is provided RLF/1551b -7-

7. Mortar preparation apparatus substantially as hereinbefore described with reference to the accompanying drawings. 1 DATED this TWENTY-SEVENTH day of NOVEMBER 1989 Wilhelmus Gerardus Elisabeth Janssen Herve Johannes Wilhelmus Janssen Patent Attorneys for the Applicants SPRUSON FERGUSON TMR/1551b L __I