DE1401300C3 - - Google Patents

Description

3 4

In the switching valves 1 and 1 'at 2 the inlet area of the closed position of the locking pieces 4 and at 3 the drain to the consumer and the process with greater security is to be determined provided, sealed in a known manner. Both valves will protrude into the inlet cross-section and can be set in axiads at the same time by means of switching magnets 15 in a directional direction.
Switch 16 triggered. In the embodiment according to FIG. 2 is from

A duct to a multi-way switching valve in double design opens into the valve seat 5 or 5 '

Order in the form of an annular channel 6 or 6 'or assumed, the two valves Ϊ and 1' also

one or more bores which are parallel to one another in their transverse direction in a manner known per se

Section are kept larger than the io can be switched in the inlet direction and together to trigger

into these ring channels opening further connection and only a single connection 19 for

opening 7 and T. The ring channels 6 and 6 'have a pressure consumer, as is the case

thus flow out in the direction of the pressure consumer from the dotted power curve shows,

and are connected to a measuring line 8. With these valves, too, as in the execution

In this measuring line 8 are measuring elements, preferred example according to FIG. 1, the valve seat 5 with the channel way in the form of a double piston 9, provided, arrangement 6, which is connected to the measuring line 8 which the pressure in the two valves 1 and 1 ', the cross-section of the channel monitoring. If each of the locking pieces 4 arrangement 6 is kept much larger than the wall-free, tight or in the correct way, e.g. the same cross-section of the feed openings 7 that are actuated in the right direction, then there is in front of the two faces of the servo means feed 2,
surfaces 10 of the double piston 9 no differential pressure. The measuring element in this exemplary embodiment be-The double piston can be transferred with the aid of springs to a position likewise consisting of a double piston 9, which is the middle position. If differential pressure, however, the measuring lines 8 preferably occur above these pressures, the double piston is shifted in the double piston with the help of an adjustable throttle cord or other direction, and it is as point 13 interconnected, the transverse of which the cut-off device 11 is set in motion for the cut essential must be kept smaller than shutdown of the valves. de>"entire cross section of the opening 7. On this

The disconnection device 11 engages the measuring elements, preferably by means of the adjuster 9 via a configuration of this bridging of the measuring lines 8, e.g. To bridge measuring elements 9. If, for example, at certain movement tolerances as a result of the locking element 4 of the valve 1, a leakage of one valve against the other has occurred, then it is formed in the direction of the same or even to be introduced without the outlet 3 causing a pressure drop, since that is caused by the inlet switching device 11 responds,
The upper opening position is also limited in its quantity in the case of a medium, depending on the multi-way valve for the person left in question, the lowest response limit of the device. tail 4 are monitored, then also receives

If, for example, there is a similarly designed valve seat 5 'on the left side of the measuring element

des 9 a lower pressure than on the other side dete channel arrangement 6 'with a smaller connection on

of the measuring element, since the smaller inlet opening 7 40 inlet, which is then also via measuring lines 8 '

of the valve 1 in the measuring line 8 continues to be on a further measuring element, which is not specified in detail

full control pressure comes into play, it is, comes into play,

However, this channel arrangement 6 'in

Measuring element 9 set in motion. their valve seat 5 'to the already existing one

If one of the switching valves is faulty or not 43 measuring element 9 takes effect, provided that between

switched jointly in good time or if both measuring lines fail, then the corresponding one

for example the release part for this switching valve, valves 17 ', e.g. in the form of non-return valves,

z. B. the solenoid, and then remains the relevant are provided, if necessary, before moving

Fende locking piece in its lower position lying sequence of the locking pieces 4 or of the

gen, while the other is opened, then 50 valve rods of the closure pieces occur in one

the safety control is also active, and the correct switching rhythm is still activated, so-

the disconnection device 11 is actuated because soon the locking pieces one or the other

also leave here with the opening valve in the measuring switch position. But it can also, from

line 8 sets a pressure reduction and starting in one of the valve positions, the measuring

Whose measuring line existing full control pressure lines are switched over. That way is

remains. it is also possible with multi-way valves to switch both positions

In order to monitor this pressure build-up and reduction directly in the lungs of the closure pieces.

1 sheet of drawings

Claims (7)

The invention relates to a servo control of Patent claims: several pressure consumers each in one servo telkreislauf, especially for the clutch and 1 servo control of several pressure brakes of a press drive, via simultaneous users in a central servo circuit, in particular 5 to be triggered mechanically or by switching magnets, special for the clutch and brake of a press individual switching valve or for a double valve drive, via simultaneously mechanical or combined and parallel-connected Individual valves for only one pressure consumer to be triggered by switching solenoids, with measuring lines, from valves or to a double valve each combined with one end to a switching valve and individual valves connected in parallel for only io and with the other end to a pressure consumer, with measuring lines, is guided by renzen responsive measuring device, each with one end to a switching valve which at a unilateral pressure reduction at one and with the other end to a pressure switching valve or a one-sided pressure build-up at different responsive measuring unit attention to the area of the measuring device assigned to it, which triggers a switch-off device in the event of a unilateral pressure reduction 15,
at a switching valve or a one-sided safety controls of this kind, it is evident that pressure build-up in the area assigned to it, before the closing pieces finally close, the measuring device needs a cut-off device to cause an overlap in the valve movements, characterized in that it is (from e.g. 0 , 5mm) in order to let the safety control all measuring line (8) on the switching valves (1, 1 ') respond, ie the measuring elements.
with one in their valve seats (5, 5 ') in the direction of this, the disadvantage then arises that with little pressure consumer opening out ducts, damage to the sealing point of the closure arrangement (6, 6') is connected to which a connector in it Order of magnitude or small opening (7, T) to the pressure medium supply foreign bodies, which are connected to these sealing points space of the switching valves (1, 1 '), as set, the valve in question is leaking, without whose cross-section is smaller than that of that the safety device responds fully.
Channel arrangement (6, 6 '). This observation is particularly disturbing with 2. Servo control according to claim 1, characterized Chen valves, in which in the sealing area by characterized in that the channel arrangement (6, 6 ') wear changes in the sealing point Is ring channel. 30 occur so that such a valve is leaking without 3. Servo control according to claims 1 and there is a possibility, at the low Wegänder-2, characterized in that the safety control respond to laspelkolben-execution designed measuring elements sen as a doping, since both types of switching path-dependent from the Beweeine preferably adjustable throttle point ( 13) work out the flow of the locking pieces,
exhibit. 35 A safety device for servo 4. Servo control according to claims I and 2 controls known in the drilling in one with multi-way valves for one or both ends of the switching valve, one with an auxiliary valve pressurized consumers, thereby valve release provided multi-way valve with the characterized in that each of the valve seats (5, 5 ') is connected to the pressure chamber of the auxiliary valve circuit in the consumer direction with one each in the sealing 40. With such a facility there is only one area of motion The outflowing channel arrangement (6, dependent response possible. Path-independent 6 ') is provided, which either does not work on further measurement, this control. The object of the invention is to act on the most path-dependent channel arrangement, in which case the speed is to be avoided and the safety device in the lowest channel arrangement (6) via valves (17 ') 45 indirectly from the closed position of the closure, preferably check valves, in to let the measuring bar come into effect,
lines (8 ') is switched off (Fig. 2). According to the invention, this is achieved by 5. Servo control according to claim 4, characterized in that each measuring line to the switching valves with a characterized in that these shut-off valves (17 ') in their valve seats in the direction of Druckverbrauin Depending on the sequence of movements, the channel arrangement leading to the outlet is connected, connecting pieces, in particular from their linkage, to the one connection opening to the pressure medium exchange side are opened and closed, the control room of the switching valves is connected, whereby this actuation area is smaller than that of the duct attachment due to the adjustable cross-section Attacks is changeable. Order. 6. Servo control according to claim 5, characterized 55 Further details emerge from the sub-signs that claims with the valve linkage. special control edges are connected to which the How the invention can be carried out in detail, Measuring lines (8) for switching between animal displays and the parts that are essential for them will. management examples in the drawing, namely 7. Servo control according to one of the preceding 60 F i g. 1 a control in the section of two individual hands Claims, characterized in that valves that come together to trigger woam Closing piece (4) a decrease in the direction of the inlet, with normal straight-through valves as valves (18) is arranged to find in the manure, Inlet engages in the closed position. F i g. 2 two single valves with common actuation 65 solution as multi-way valves, which are also interconnected in pairs to form a single valve group and can act on a single pressure consumer.