DE1864915U - VOLUMETRICALLY MEASURING DOSING DEVICE PREFERRED FOR THERMOPLASTIC BINDING AGENTS, IN PARTICULAR FOR BITUMINOUS ROAD CONSTRUCTION, WITH A CONTROLLER ADJUSTABLE BY A SLIDE IN A MEASURING CYLINDER IN ITS STROKE. - Google Patents

Description

RÄ.670 «9« 20.

Utility model registration

of the company

WIBAU

■ West German industrial and road construction machinery company m.b.H. Rothenbergen / Hesse.

"Volumetric metering measured preferably thermoplastic binder _s in particular for the bituminous road, with a regulated in a measuring cylinder through a sliding ,, adjustable in its stroke piston."

Volumetrically measuring metering device preferably for thermoplastic binders, especially for the ■ bituminous road construction with a controllable by an in a measuring cylinder sliding piston adjustable in its stroke. '

The device is used for volumetric measurement and dosing of preferably thermoplastic binders, especially for carrying out various mixing processes,

Are a number of devices known for this _? all of which work on the positive displacement principle, e.g. measuring pumps and. Oval gear meters which are particularly suitable for continuous measurements, as well as piston measuring devices in particular for batch measurements.

In the last-mentioned types, a piston sliding in a cylinder is driven by a spindle or a Other mechanical system adjusted externally according to the required cylinder filling level. The piston is rigidly connected to the adjustment mechanism. These devices have the disadvantage of an idle cycle, a, us the corresponding Loss of time results, as well as the entangled sealing problems for those moving in the binder Parts of the adjustment mechanism for the volumetric flask.

By means of the volumetrically measuring metering device according to the invention these disadvantages are avoided for thermoplastic binders.

The invention provides a piston that moves freely in a cylinder in front of ₅ whose stroke can preferably be set as desired by an axially directed variable stop, which is alternately acted upon by the binding agent by means of a reversing device, so that every piston stroke becomes a working cycle. The reversal

- 2nd

2 -

device can be designed as desired, preferably However, one becomes soTrohl on the feed as also-on the derivative side a normal, opposite provide directional three-way control.

The invention is explained in more detail in FIG. 1.

From a ■ binder circuit ₃ consisting of the binder storage tank 1, the pump 2 and the pressure relief valve 3, the binder flows to the binder dosing device. Here, the binding agent is fed to the cylinder 5 via a three-way valve 4 and hits the piston 6, which yields to the pump pressure the existing binding agent filling of the cylinder on the opposite side of the piston via a second three-way valve 7 and a lower setting than the overpressure valve 3 Lying second pressure relief valve with attached nozzle 8 supplies the mixing process. The piston 6 moves up to the stop at a stroke limiter 9 _S which in the example is designed as a spindle, the setting of which determines the desired stroke volume and thus the amount of binding agent. The handwheel of the spindle can have an effective connection with a position indicator (not shown), Tiromit is a measuring scale created in the simplest way. Via a lever system 10, the valves 4 and 7 can be switched over synchronously by means of a handle 11 or mechanically, electrically, hydraulically or pneumatically. The next measuring or working cycle now begins from the opposite side.

Claims (5)

RA.67042 ^ * 20; fE2, Protection claims 1.) Volumetrically measuring metering device, preferably for thermoplastic binders, especially for "bituminous road construction, with a controllable by an in
a measuring cylinder sliding, in its HuIo adjustable piston, characterized in that a in one
Cylinder (5) freely moving piston (6) whose. Stroke is preferably set as desired by an axially directed variable stop (9) and alternately acted upon by the binding agent, the necessary deflection of the binding agent being carried out by a reversing device (4/7 / IO), the respectively set amount of binding agent for each piston stroke to the mixing process feeds. 2.) Door direction according to claim. 1, characterized in that the reversing device for the binding agent is formed by an interposed three-way valve (4/7) on the supply and discharge side, wherein
the three-way valves are directed in opposite directions and
be switched synchronously « 3.) Device according to claim 2, characterized in that the synchronous switching of the three-way valve (4/7) is carried out via a linkage (10), whereby the actuation by means of a handle (11) or pneumatically, hydraulically or electrically. 4 ») Device according to claim 2, characterized in that the synchronous" switchover of the two three-way valves (4/7) takes place by a separate, arbitrarily acting actuator assigned to each valve. 1— 2 - 5.) Device according to claim 1 $ characterized in that preferably in the lens spray nozzle. built-in pressure relief valve 8 is set lower than the pressure relief valve connected to the circulation line SBAU West German industrial and road construction machines · Gesellschaft m.b.H.