CS258306B1 - Laboratory equipment for dried milk sample preparation for solubility determination - Google Patents

Abstract

Laboratory equipment for preparation sample milk powder has on the base plate placed mixing vessel into which it interferes a stirrer mounted on a guide rod sliding part, equipped with stop and lever mechanism to induce vertical shift. On the guide bar Electric is fixed limit switch, wired over electrical timing switch electric motor drive muóhadla. It is removable above the level of the mixing vessel attached boat, fixed on the hinged plate, pivoted on pin and fitted with a stop.

Description

The invention relates to a laboratory apparatus for preparing a sample for milk powder to determine solubilities.

The prior art device consists of a mixing vessel placed on a base plate with a measured amount of water into which a batch of milk powder is poured manually. A stirrer is inserted into the resulting slurry which is brought into operation by a manually operated switch.

After the prescribed time monitored by the operator, the drive is switched off manually and the agitator is switched off. ejected from the mixing vessel.

Said solution exhibits thrush while adhering to the mixing time limit, which affects the accuracy of the assay. Manual filling of the dose into the mixing vessel is also imperfect, influenced by the accuracy of the operator's work.

These drawbacks are eliminated by the laboratory apparatus for the preparation of the milk powder sample for determining the solubility according to the invention, consisting of a base plate on which a mixing vessel is placed, in which a vertically displaceable agitator intervenes. SUMMARY OF THE INVENTION The invention is based on the fact that the sliding part of the stirrer mounted on the guide rod is provided with a stop and a lever mechanism for inducing a vertical displacement, wherein a limit switch is connected to the guide rod via an electrical timer. Above the level of the mixing vessel there is a removable clamping boat mounted on a hinged plate rotatably mounted on a pin. The tilting plate may be provided with an electromagnet for controlling the tilting moment, in which case it is fixed to the base plate. Alternatively, in the mechanical control of the tilting torque, the tilting plate is secured to the sliding portion via a pivot pin, wherein an adjustable stop is provided on the base plate. The hopper can be fixed to the tilting plate using a permanent magnet.

The laboratory apparatus according to the invention ensures compliance with the same conditions during sample preparation, in particular the mixing time and the constant pouring time of the batch from the weighing boat into the mixing vessel, while reducing the operator's demands.

In the drawing, an example of an embodiment of a laboratory apparatus for preparing a sample of milk powder according to the invention is shown, in which Fig. 1 tilts the tilting plates by means of an electromagnet and Fig. 2 tilts the tilting plates mechanically.

In FIG. 1, on the base plate 14 is placed a mixing vessel 6 into which a stirrer 3, mounted on a guide rod 6, extends a sliding part 6, which is provided with a stop 10 and a lever mechanism 12 for causing vertical movement. On the guide rod is fastened £ electric limit switches ^ - / connected via an electrical timer to the motor drive £ \ 2 stirrers third level above the mixing vessel 4 is positioned attachment snlmatelně boat _5 mounted on _a hinge plate 13 mounted pivotally on the 11th The tilting plate 13 is provided with an electromagnet 6 and is fixed to the base plate 14.

FIG. 2 shows the operation of the tilting plate 13 mechanically. The hinged plate 13 is fixed to the sliding portion 9, and an adjustable stop 15 is provided on the base plate 14.

The function of the device is as follows: by means of a lever mechanism 12, manually operated, the stirrer 4 is inserted into the mixing vessel 4. At the same time as the tilting plate 13 is tilted, the batch from the weighing boat 4 is poured into the mixing vessel 4. After the set time has elapsed, the electric timer 8 switches off the stirrer drive 3 and the lever 12 moves the stirrer 8 out of the mixing vessel. In the case of electromagnetic actuation, the limit switch 8 actuates the solenoid 8, which by pulling the core tilts the tilting plate 13. In the case of mecha-. In order to operate the tilting plate 13, the tilting plate 13 is tilted by sliding downwards and by the action of the stop 15.

A laboratory apparatus for preparing a sample of milk powder is useful for preparing a sample of other substances where the mixing time or the contact time of the sample with the solvent, for example starches, is determined.

Claims (4)

A laboratory apparatus for preparing a sample of dry milk for determining solubility, consisting of a base plate on which a mixing vessel is placed, in which a vertically displaceable stirrer extends, mounted on a guide rod, characterized in that the sliding part (9) of the stirrer (3), mounted on the guide rod (1), is provided with a stop (10) and a lever mechanism (12) for inducing a vertical displacement, wherein an electric limit switch (8) connected via an electric time switch is fastened to the guide rod (1). A weighing boat (5) mounted on a hinged plate (13) mounted on a pivot plate (11) is removably positioned above the level of the mixing vessel (4) on the electric motor of the agitator (2). 2. Laboratory apparatus according to claim 1, characterized in that the tilting plate (13) is provided with an electromagnet (6) for controlling the tilting moment and is fixed to the base plate (14). 3. Laboratory apparatus according to claim 1, characterized in that the hinged plate (13) is mounted on the sliding part (9), wherein a stop (15) is adjustable on the base plate (14). Laboratory device according to one of Claims 1 to 3, characterized in that the hopper (5) is fixed to the tilting plate (13) by means of a permanent magnet.