US2529656A - Binder supply system - Google Patents

Description

H. C. HETTELSATER BINDER SUPPLY SYSTEM origina Filed Dec. 1;, 1943 Nov. 14, 1950 Patented Nov. 14, 1950 BINDER SUPPLY SYSTEM 'Henry 0. Hettelsater, Whitefish Bay, Wis, assignor to *Harnischfeger Corporation, Milwaukee,'Wis., a corporation of Wisconsin Original application December 13; 1943, Serial N 0.

514,177. Divided and this application December 15, 1944, Serial No. 568,255

4 Claims.

The invention relates to a traveling material treating apparatus for conditioning the material. used for making roads or other pavements at the place of use.

This application is a division of my copending application Serial No. l4,l77,'filed December 13, 1943, now U. S. Patent No. 2,424,459, dated July 22, 1947, and relates more particularly to the means for supplying the binder ingredient to the road materials during the mixing operation.

According to the aforesaid application, in the making of road or other pavements, the material operated upon by the soil treating unit is subjected to the action of a rotary cutter and a target rotor to thoroughlymix and blend the material which is then transferred to a blading mill where it is further mixed and then deposited upon the road bed. During the transfer of the blended road materials they are sprayed with a suitable binder ingredient with which they are thoroughly'mixed while in the blading mill. The binder ingredient is carried or temporarily stored in the transporting unit, and according to the present invention, means are provided on said unit for putting binder ingredient under pressure and delivering it under the control of the operator to the spraying device on the treating apparatus. As the binder ingredients may be of different kinds, such as water in the case of a cement binder and petrolerun in case of an asphaltic pavement, provision is made for handling both types of binder ingredient through the same spraying apparatus as hereinafter explained.

The invention further consists in the several features hereinafter described and more particularly defined by claims at the conclusion hereof.

in the drawings:

Fig. 1 is a diagrammatic showing of the binder supply system and its controls;

Fig. 2 is a detailed vertical sectional view taken through one of the spring loaded hydraulic actuators.

Referring to Fig. 1 of the drawing, the numeral it designates the engine of the propelling unit it which it drives. Engine it also drives a pump which supplies hydraulic operating to a pipe which joins with a volume limiting T-coupling 5i throughwhich the fluid has free passagev into. pipe 52. T-coupli-ng 5i i so. arranged that a branching stream of fluid of limited volume may escape therefrom into pipe 53 whichas hereinafter described connects with a. pipe 2:95.

The pipe 52 connects'with a second volume limiting T-coupling 64 similar in all respects to the T-coupling 5I through which fluid may freely pass to pipe 65 while a limited stream-may escape into-pipe 5t. Pipe 65 in turn joins w'ith a fixed aperture back pressure orifice 5! so constructed as topermit fluid topass therethrough but to maintain ahead of it a pressure equal to the intended operating pressure of the system. Pressure fluid returns to the supply tank &3 through pipes 69 and 62 and is carried to the pump is through pipe 49a.

Tanks 3 and '5 for binder ingredient are suitabl mounted on the transporting unit II.

Because of the variation in viscosity between water and the bituminous binder compositions to be handled, two pumps, one a centrifugal pump 58, and theother ofthe positive displacement type pump, M8, are provided. 'These'pumps through suitable clutch mechanism shown in full in the'application heretofore referred to are adapted to be selectively'or conjointly connected to an engine or prime mover I45.

A cross connecting pipe I51 provided with Ts I52, 153, I56 connects at its ends with tanks t and '5 and has a valve I-55'mounted therein between the-T's I56 and 553.

Pump MB'is connected on its suction side with the pipe 55! at the T E53 b a pipe which rises and passes through the valve E and then to the pump. Pump 155 is connected on its suction side with the pipe 15-h at the T 155 by a pipe I59 which has avalve 16!] mounted therein. In this way the pumps M8 and E53 being connected-to the crosspipe-IEH on opposite sides of the valve H55 and each being provided with a valve controlling their inlets may be employed simultaneousl or separately either to draw fluid simultaneously from both oiv the tanks 4 and 3 with valve I55 open or by closing this valve to draw from single tanks separately.

The discharge from pump I48 is carried by pipe IBi to a proportioning by-pass valve I 52, the side diversion outlet of which is joined by a pipe I63 with the cross connecting pipe I5'I at the T I52. The principal stream outlet of valve I62 passes through pipe I64 to a volume meter I65 and pressure gauge I66 and thence through the hose I61 to a hydraulically operated shut 01f valve I68. The flow from valve IE8 is finally carried by joining connections into a distributing spray pipe I69.

In similar manner discharge from pump I50 is carried by pipe Hi] to a proportioning by-pass valve iii, the side diversion outlet of which is carried into tank 4 by return pipe I12. The main stream outlet of valve I1I is joined by a pipe I13 which passes to a volume meter I14 and pressure gauge I15 from which hose I16 leads to a hydraulically controlled shut off valve I11. Flow from valve I11 is finally carried by connections to a distributing spray pipe I18. Spray pipes I69 and I18 are interconnected by cross piping including a valve 202, so that the capacity of both may be availed of to handle fluid delivered by either pump, if desired.

The proportioning by-pass valves I62 and HI are similar in construction and are arranged to be hydraulically operated as shown more in detail in the aforesaid parent application, each valve being operated by a piston working in a hydraulic cylinder I84 whose piston I82 is connected with the valve by an operating lever I8I. Each piston is initially loaded by a spring I81 interposed between the piston and the end plug I83. These valves are preferably piston type valves.

Similar hydraulic actuators I90 and I9I are provided, respectively, for valves I68 and I11 with the exception that the returning springs thereof which are shown in detail in the aforesaid application are weaker to such an extent that a pressure suflicient to overcome the initial compression of the springs associated with either of the valves I62 or I1I will be sufficient to cause valves I68 and I11 to be fully opened.

To supply and regulate the fluid under pressure for actuation of valves I62 and I68, fluid available in branch conduit 53 is connected by conduits I 92 and I94 with the cylinder I84 of the valve I62 and by conduits I92 and I93 with the actuator I90. A by-pass connection I95 controlled by a hand operated needle valve I96 joins with the return conduit 62. With valve I96 closed, the full discharge pressure of pump 49 is applied to the conduit I92 and with the valve I96 in intermediate stages of adjustment, various regulated pressures are applied to the conduit I92. With the valve I96 open, insufl'icient pressure is applied to conduit I92 to overcome the return springs in the actuators of either of the valves I62 or I68 and both of said valves remain closed. In this way the operator by closing down on valve I95 first brings about the opening of valve I68 and then by further closing down of valve I96 causes the desired proportion of the delivery of pump I48 to be supplied to the spray pipe I69. By inspection of the meter I65 or gauge I66 or both the operator is thus able to establish any prescribed rate of delivery of fluid desired. Furthermore, in stopping delivery of fluid, complete opening of the valve I96 causes closure of valve I68,\thus avoiding prolonged after-drainage of fluid held in the long connections between valve I62 and the spray pipe I69.

In an entirely analogous manner and with analogous results control fluid regulated by the valve I91, interposed in by-pass connection I98 is supplied through conduit 66, connecting conduit I99 and connecting conduits 20I and 200 to actuator I9I and the actuating cylinder I84 for the valve I1I, respectively.

Valves I96 and I91 are located on the transporting unit within convenient reach of the operator. A very desirable automatic regulation is also provided by this arrangement due to the action of the fixed aperture back pressure orifice 61, acting in conjunction with the engine driven pump 49. If the engine speed (meaning engine is slowed for any reason, the pressure in the actuators of valves I62 and HI will drop, and these valves will be closed a corresponding amount, thus proportioning the rate of application of fluid to the forward speed of the apparatus. In case the engine I0 stalls the valves all close, thus shutting off the flow of liquid.

I desire it to be understood that this invention is not to be limited to any particular form or arrangement of parts except in so far as such limitations are included in the claims.

What I claim as my invention is:

1. In a binder fluid supply system for a material treating apparatus of the class described, the combination comprising a binder fluid reserve tank, a binder fluid pump, a spray pipe, a supply conduit connecting the discharge of said pump with said spray pipe, a proportioning by-pass valve in said supply conduit, having a side branch rejection port, a conduit for disposing of rejected fluid from said side branch port, means connecting the inlet of said pump with said reserve tank, a out 01f valve in said supply conduit adjacent to said spray pipe, a spring loaded hydraulic actuator for said by-pass valve, a second spring loaded hydraulic actuator for said out off valve adapted to respond to a lower actuating pressure than said first mentioned hydraulic actuator, and means for supplying hydraulic actuating fluid to said actuators under controlled adjustable pressure.

2. In a binder fluid supply system for a material treating apparatus of the class described, the combination with a conduit containing a binder fluid under pressure, a spray pipe supplied by said conduit, a cut off valve and a proportioning valve in said conduit, an hydraulic actuator for each of said valves, 9. source of hydraulic pressure fluid for both of said actuators, and a manually controlled by-pass valve in said source to vary the operation of the actuator for said proportioning valve and to control the operation of the actuator for said out 01f valve.

3. An apparatus in accordance with claim 1 wherein the means for supplying actuating fluid comprises a pump connected in driven relationship to a prime mover which in turn is connected in propelling relationship to the material treating apparatus.

4. An apparatus in accordance with claim 2 wherein the source of hydraulic pressure fluid for the actuators comprises a pump connected to a prime mover to be driven thereby at speeds proportional to the speed thereof which prime mover is mounted on said material treating apparatus in propelling relationship thereto.

HENRY C. HETTELSATER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 622,547 Shedlick et al Apr. 4, 1899 830,046 Bole Sept. 4, 1906 1,010,158 Lent Nov. 28, 1911 1,544,509 Vowell June 30, 1925 1,895,739 Spindt Jan. 31, 1933 1,960,472 Balaam et al May 29, 1934 2,009,418 Schwendner July 30, 1935 2,029,765 Durdin Feb. 4, 1936 2,268,079 McKay et al Dec. 30, 1941 2,305,971 Livingston et a1. Dec. 22, 1942 2,334,679 Mason et al Nov. 16, 1943 2,345,297 Schwendner Mar. 28, 1944

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