DE710000C - Valve control for presses - Google Patents

Description

Valve control for presses For the inlet and outlet of a pressure medium to or from the working device driven by press water, steam, air or the like So far, presses are different types of valve controls with manually operated externally adjustable auxiliary valve controls have become known, of which the most common valve control in each of the main control valves with an annular guide a simple auxiliary control valve is installed axially, which when opened by hand to Relief from the located above the upper face of the main control valve and through the guide gap as well as through those made in the annular guide small auxiliary bores constantly connected to the pressure medium inflow chamber @Upper valve chamber pressure medium into the one located under the main control valve Lets flow out drain chamber.

In the case of another control system that has become known, this also exists Auxiliary valve control axially installed in the main control valve with an annular guide from two auxiliary valves, which are firmly connected to each other by a common spindle of which the lower auxiliary valve alternates with the movable main control valve and the upper auxiliary valve against one with the valve housing firmly connected seat closes, so that when the lower auxiliary valve is open Pressure medium from the pressure medium inflow chamber located under the main control valve into the one above the upper face of the main control valve through a Packing sealed upper valve chamber flows in and the main control valve closes, when the upper auxiliary valve is open, however, pressure medium from the upper valve chamber escapes into a special drainage channel, opening the main control valve and pressure medium from the inflow chamber into the immediately above the main valve cone located drain chamber can flow. In the case of the aforementioned Both types of control existing control mode of the auxiliary valves result in the following Abuses: i. With both types of valve, a frequently occurring disproportion occurs between:. the inflow and outflow cross-section of the upper valve chamber a strong, .Often burst pipes and other rattling rattling of the main control valve that can cause damage a.

z. The former control gradually increases during of the operation the relatively high control force due to wear and tear of the main control valve in its guide sleeve, which then the operator very much tired and the fine control of the pressing speed is very impaired.

3. The inexpedient auxiliary valve arrangement of the latter control completely excludes the possibility of regulating the pressing speed.

q .. With both controls, the sealing surfaces of the auxiliary valves very strong due to very unfavorable flow conditions in the auxiliary valves attacked.

As a result of the rigid connection between the two auxiliary valves the latter control occurs when the upper one is opened until it closes of the lower auxiliary valve continuously unused pressurized water in a special Drainage channel.

6. With both controls, the position of the standing organs is for the valve lift adjustment very uncomfortable below the control housing and just above the floor.

7. From the constantly increasing requirements regarding size and the quality of the material to be pressed results in an enlargement of those to be operated by hand Controls of these machines and thus a higher effort for the operation of these controls.

These inconveniences are avoided in the valve control according to the invention described below in that of the two auxiliary valves axially arranged in the main control valve, the auxiliary valve attached to the upper end face of the main valve is connected to the inlet of pressure medium from the lower inflow chamber from the one arranged on the lower end face of the main valve Upper valve chamber mediating auxiliary valve is arranged and actuated separately and serves to control the outlet of the pressure medium from the upper valve chamber via a second bore of the main valve to the drainage chamber. A further embodiment of the arrangement according to the invention is that the valve cones of the two auxiliary valves by means of two double levers acting on their two valve spindles by a common spring or the like arranged outside the valve housing on a linkage in opposite directions tt , in the main valve arranged valve seats let the closed position be pressed, further @ ß a relative to the spring linkage displaceable drive linkage with adjustable drivers is arranged by means of this driver against the spring pressure of one or the other valve lever at its end loaded by the spring to control one of the two Auxiliary valves is taken.

The structural arrangement of the new control makes it easy to access to the adjustable drivers for the exact valve lift setting.

By installing a check valve either in the main stern valve itself or in the control housing in an additional connection line between the Drain chamber and the one above the upper face of the main valve When the main valve closes, the valve chamber can release the pressure medium from the discharge chamber overflow into the upper valve chamber, which means that even with very large main control valves the use of extremely small auxiliary valves to achieve the smallest control forces is made possible.

In the drawings, Fig. I shows the control system according to the invention with the two-valve auxiliary control built into the main control valve when the Control valve in cross section, while Fig.2 shows the arrangement of the check valve also shows in cross section in the main control valve.

The embodiment selected as an example in FIGS a control valve of a hydraulic one usually containing several valves of the same type Control is shown schematically, with the arrows indicating the direction of entry and exit of the pressure medium.

The control valve h built into the valve housing g (Fig. I and 2) is guided in the guide bush i in the usual way. The chamber k located above the control valve h is sealed in a known manner by a seal 1 against the guide gap. The control valve 1i is provided with a bore in which leads from the lower inflow chamber n to the upper housing chamber k . Is used to seal the hole in a small, drawn here in the open position the auxiliary valve, o the valve spindle p downwards from the valve housing g protrudes and by a by: is pressed lt upward pressure of a strained spring g against DAS control valve. To transfer the spring pressure to the valve balance between the three chambers n, ta and h, the valve h; as they say, to swim in water, to direct enough water to chamber h for quick valve closure.

The enlargement of the 'valve o would result in a higher hand lever pressure for actuating the control. To avoid this, therefore, the check valve L is either according to the Fig. 2, in a particular compound Kanaln, 0 incorporated into the control valve or in a non-illustrated manner in the valve housing, which in addition to the supply of pressure medium from the influent n mer for Chamber k through VentiLo together with the bore m still enables the entry of pressure medium from the discharge chamber tt through the valve L to the chamber k. When the valve closes in this way, with an overpressure in the chambers it and h in relation to the chamber u, the check valve L remains closed and the valve closing pressure occurring as a result of the overpressure then ensures sufficient water supply to chamber k through the valve o. PATENT CLAIMS: i. Manually operated high pressure valve control for the inlet and outlet of a pressure medium to or from the working device of presses driven by press water, steam, air or the like outside -her @adjustable auxiliary valve control is arranged, the pressure medium is routed via an inflow chamber permanently connected to the pressure medium supply line from below to an overlying discharge chamber controlled by the main control valve and from there to the press and the auxiliary valve control is operated from two opposite sides but in the same axial direction as the main control valve Valves consists of which one arranged on the lower end face of the main control valve controls a passage to a chamber located above the upper end face, characterized in that the second on the upper end face of the main control valve (h) and the first the inlet let the auxiliary valve (o) which mediates the pressure medium from the inflow chamber (tt) to the upper chamber (k) and which is actuated separately for controlling the outlet of the pressure medium from the upper chamber (k) via a bore (t) of the main control valve ( h) is used for the discharge chamber (ta).

2. Valve control according to claim i, characterized in that the valve cones of the two auxiliary valves (o, v) by means of two on the two valve spindles (p, w) acting double levers (s, z) by a common outside of the valve housing (g) on one Linkage (x) arranged spring (g) or the like. In opposite directions on their arranged in the main control valve valve seats are pressed into the closed position.

3. Valve control according to claim i and 2, characterized in that .that its relative to the spring linkage (x) displaceable drive linkage (F) with thereon adjustable drivers (D, E) is arranged by means of this Drive against the spring pressure of one or the other valve lever (s or z) at its end loaded by the spring (g) to control one of the two Auxiliary valves (o, v) is taken.

q .. valve control according to claim i, characterized in that a Check valve (L) either in the main control valve (h) itself or in the control housing (g), in an additional connection line (N, O) between the drainage chamber (u) and the chamber located above the upper face of the main control valve (k) is arranged that an overflow of the pressure medium from the discharge chamber (tt) into the chamber (k) (Fig.2).

Claims (1)

Spindle p is used by the double-armed lever s rotatably mounted at Y. In addition, the control valve / t has a second bore t, which leads from the upper housing chamber h to the middle drainage chamber u. A second small auxiliary valve v is used to seal this bore t, the valve spindle w of which protrudes upward from the valve housing g and is pressed against the control valve by a downward pressure of the same spring q. The hollow spring linkage x and the double-armed lever z rotatably mounted at y serve to transmit the spring pressure to the valve spindle w. The spring pressure is set by adjusting nuts A in such a way that it is sufficient to overcome all the resistances occurring at the valve spindles p and tv and to still exert a sufficiently high sealing pressure on the valve cones o and v. A rod F provided with adjusting nuts D and F_ is loosely passed through the hollow spring linkage x as well as through the pierced joint pieces B and C, which transfer the spring pressure on the levers and z I and roller lever K can be raised or lowered while taking the joint piece B: or C, which in turn either causes the lower valve. o as drawn, or the upper valve v is opened. In the case of large control valves, in special cases where a very rapid closure of the control valve / t is desired, a non-return valve L can be installed in a special connecting line N, O of the control valve h as shown in Fig. 2 or in the control housing g of the control valve lt pressing fluid can be passed from the middle outlet chamber u to the upper chamber k if the pressure between the chambers tt and tt is equal. The mode of operation of the new control according to Fig. I is as follows: In Fig. I, the control valve h is shown closed, which corresponds to the hand lever position I. Here, the valve lt rests on the valve seat NI, and the valve 9 is held open by the raised rod F by means of the adjusting nuts D. The valve v remains closed under the spring pressure. The pressure medium passes from the inflow chamber it through the bore "t into the chamber k and there generates a downwardly directed closing pressure on the valve k in a known manner. To open the valve k, the hand lever H moves from its position I in the direction towards Position II moves .. In position II the valve is completely open. As a result of the thumb shifting, the roller lever h, the rod F and the joint piece B of the lever s resting on the adjusting nuts, D @ is lowered and the valve o is closed. At the same time, the adjusting nuts E have come so close to the gel piece C of the lever z that if the hand lever H continues to move, the valve t2 is opened and pressurized fluid from the chamber k through the bore t into the still unpressurized or under low pressure outlet chamber n The valve is lifted by the upward pressure under this pressure until it moves against the V, which was previously open entil i, and prevents the further escape of hydraulic fluid from the chamber h. At the same time as the valve lt, the valve o is also lifted by the spring pressure, so that the bore in remains closed and the valve in this position comes to a standstill if the hand lever H does not perform any further movement. If the hand lever H is moved further in the direction towards position II, the aforementioned play is repeated until the valve / t is fully open in the lever position II. In a similar way to opening, the closing of the valve lt takes place by the opposite movement of the hand lever H from position II to position I. Only the valve is opened at a time, whereby pressure fluid is released from the chamber tt through the hole in, in the chamber k arrives, but in turn the valve v always remains closed under the spring pressure. With this precise control mode, whereby only one of the two valves 9 and v can be opened, the valve will always perform a smooth upward or downward movement until it comes to a standstill, without the strong rattling that often occurs in the known controls Fidget movement to guess. The mode of operation of the check valve L according to Fig. 2 is as follows: When the valve h is closed, especially with a smaller valve diameter, the passage cross-section of the relatively very small valve o plus the bore nt is generally sufficient to supply sufficient pressure medium to the chamber k at normal closing speed. If, however, especially with large valve diameters, an extraordinarily high closing speed is required for special purposes, the passage cross-section of the valve, including the bore, would have to be increased accordingly in order to be able to operate in the state of pressure