DE969410C - Sausage filling machine with oil pressure controlled working piston - Google Patents

Description

There are hydraulically controlled sausage filling machines known, in which by additional devices prevents sausage meat from flowing out of the filling tube after each individual filling process has been completed shall be.

These devices essentially consist of two different systems which are defined as follows can be:

i. Mechanical shut-off valves or gate valves, which are installed between the filling cylinder outlet and the filling pipe and mechanically with the operating linkage the hydraulic control are coupled in such a way that the shut-off devices upon termination a filling stroke (working stroke) with the return of the operating lever to the stop position progressively close the filling tube outlet.

2. Mechanically controlled or manually adjustable relief valves, which act in such a way that a certain pressure relief takes place in the working cylinder at the moment the hydraulic control switch moves into the stop position.
While the first-mentioned embodiment brings with it a mechanical complication in the structure of the control, which also only imperfectly corresponds to practical requirements in terms of its mode of operation, the embodiments built according to the second system require constant manual readjustment in the course of the individual filling processes, as they The mode of action depends on both the volume of the product and the different degrees of elasticity of the product.

809 522/21

The essence of the invention, on the other hand, consists in that by a specially designed circuit (Control edge cuts) within the hydraulic switch or through additional discharge lines inevitably a relief stroke in the hydraulic system of the working piston at the moment of retraction to the Holding position is achieved, the size of which always varies according to the previously built up without external correction hydraulic compression pressure and the expansion pressure ίο of the compressed product.

The size of the required relief stroke is given by the fact that the remaining pressure of the The filling material in the stop position of the hydraulic system should be less than or at most equal to the sum of the inner Friction and the surface friction of the product in the filling tube. That these coefficients of friction are essentially Determine the required pressure in the hydraulic cylinder, it follows that the pressure relief required relief stroke of the hydraulics depending on the compressibility of the product can assume different values, which are directly related to that for the filling process pressing pressure to be expended; d. In other words, the greater the filling pressure required, the greater it will be required relief stroke. It can be seen that the remaining specific pressure of the filling material after the relief of which, even with different types of filling material, has only a slight spread and almost can be assumed to be constant. The invention relates to a sausage filling machine with hydraulically controlled working piston, which prevents the filling compound from flowing in is automatically relieved from the filling tube of the roasting cylinder in the stop position and their special The characteristic is that in the control switch, the control edge cuts or the inner connecting channels are arranged so that they are in the Hold position a pressure equalization within the lines leading to the control cylinder and at the same time an outflow possibility via a return line connected to this for the amount of hydraulic fluid is given, which is used to relieve the working piston and / or through the expansion of the compressed filling material required relief stroke is displaced. This amount of oil can be over the short-circuited supply lines to the working cylinder and at the same time via the control edge gates flow back into the pump oil circuit, whereby they flow through the back pressure in the pump circuit is limited. By arranging check and shut-off valves in suitable places, an unintentional The lines and the control cylinder are prevented from running empty when the pump is at a standstill. The same effect can be achieved by arranging an additional line from the normal pressure and return line separate, internal connection can be achieved in the hydraulic switch, through which the pressure relief required amount of oil via a separately arranged return oil line in the stop position can flow off the oil tank, limited by a correspondingly matched pressure relief valve will. Another modification consists in the arrangement of an air chamber, in which by a Also open in the hold position of the hydraulic switch, the connection to be discharged for pressure relief Dodge the amount of oil and from which it is expediently in the pressed position of the hydraulic switch can flow off via the normal return oil line.

The concept of the invention can also be used in other hydraulic devices which a similar effect of the control unit is desired.

Some further features of devices according to the invention are shown below with reference to the drawing briefly explained, in a purely schematic representation, some implementation possibilities of the inventive concept shows.

Fig. Ι shows the arrangement with control edge gates in the hydraulic switch,

2 shows a circuit with a compensating line and a shut-off valve,

3 shows a similar embodiment with an air chamber.

In all three exemplary embodiments, 1 denotes the filling cylinder of a sausage filling machine, with 2 the filling tube onto which the casing to be filled is pushed, with 3 the hydraulic working or Control cylinder with piston 4 and with 5 the hydraulic control switch. From the control switch 5 after Control cylinder 3 leads the pressure oil line 6 and from this to the switch 5 back the return oil line. With 8 the pressure medium pump is designated, with 9 the pressure medium container, with 10 a regulating valve for Limitation of the maximum pressure, with 11 those of the Pump 8 to the control switch 5 leading pressure line and 12 from the control switch to the oil tank leading return line.

In the embodiment according to FIG. 1, gates 13 and 14 are provided on the control edges which, depending on the switch position, the following connections are made:

In switching position II (pressing): connection between lines 11 and 6 on the one hand and between 7 and 12 on the other hand; the pressure oil moves the piston upwards and presses the sausage meat into the sausage casing. The oil located above the piston 4 flows off to the oil container. In the switch position I (stop position) the lines 11 and 12 are short-circuited. Through the Gates 13 and 14, the piston is floating, i. H. kept depressurized and can therefore follow any elastic expansion of the filling material of any size, so that this is not caused by the FüUrohr2 exits.

For example, the relief stroke in the filling cylinder is designated by h.

In switching position III (lowering) the lines with the line 7 and the line 6 with the Line 12 connected. The piston 4 is pressed down by the pressure oil. The ones below him Any liquid present can drain into the oil sump.

In the embodiment of FIG. 2 are also with I, II and III denote the holding position, pressing position and lowering position of the hydraulic switch. In a departure from the arrangement according to FIG 16 leads to the oil tank and in the stop position causes the control piston 4 to be relieved. The connections are as follows:

Switching to "pressing": pressurized oil flows through lines 11 and 6 into the lower part of the Control cylinder, return oil flows through lines 7 and 12 and 15.

Stop position: connection between 11 and 12 on the one hand, pressure equalization between 6, 7 and 15 on the other.

Lowered position: Connection between pressure oil line 11 and 7, return oil line 6 and 12.

3 shows a similar example in which the compensation line 17 is connected to an air tank 18 is. The line connections in the three switching positions are otherwise analogous the same as in the example of FIG. 2.

Claims (5)

PATENT CLAIMS: i. Sausage filling machine with oil pressure-controlled working piston to prevent overflow automatically relieved of filling compound from the filling tube of the roasting cylinder in the stop position is, characterized in that in the control switch (5) the control edge cuts (Fig. 1) or the inner connecting channels (Fig. 2, 3) are arranged so that they are in the holding position pressure equalization within the lines (6, 7) leading to the control cylinder (3) and at the same time a discharge possibility via a return line connected to these (12, 15) for the relief of the working piston or for the expansion of the compressed filling material required relief stroke displaced hydraulic fluid amount given is. 2. Sausage filling machine according to claim 1, characterized in that the through the relief stroke amount of oil displaced from the lower part of the working cylinder depending on the design via control edge cuts (13, 14) in the control pendant (5) or through an additional return oil line (15) or an alternative line (17) in an air chamber can flow off, the limitation of this amount either by dynamic pressure (Fig. 1) or a matched pressure relief valve (16 in Fig. 2) or by the matched volume of the air chamber (18 in Fig. 3) can be limited. 3. Machine according to claims 1 and 2, characterized in that to prevent a unintentional idling of the hydraulic lines, especially the control cylinder - at with the pump at a standstill - in the pressure line (11) between the pump (8) and the control switch (5) Check valve and in the return oil line (12) between control switch and oil tank a from the pressure line controlled shut-off valve is arranged, which inevitably when switched off Pump blocks the return line. 4. Machine according to claim 1, characterized in that that a compensating line (15) is connected to the control switch, through which in the Hold position (I) the amount of oil to be displaced during the relief stroke via a pressure control device, for example a pressure relief valve (16), can flow off into the oil tank (9). 5. Machine according to claim 4, characterized in that the compensating line (17) in one Air chamber (18) opens, from which the displaced amount of oil during the working stroke by the control switch flows off into the return oil line. Considered publications:
German Patent Nos. 619 673, 669 470; »Die Hütten, Vol. 4, 26th edition, pp. 528/529. 1 sheet of drawings S09 522/21 5.58