DE1942677A1 - Electrically operated hydraulic valve - Google Patents

Description

ELECTRICALLY ACTUATED HYDRAULIC VALVE

The present invention relates to electrically operated hydraulic valves for explosive ambient media, preferably to control valves of hydraulic actuators

motors in mechanized shaft construction. and mining machinery.

The shaft lining and mining machines equipped with hydraulic servomotors are found in coal mining today an extensive application. Hydraulic actuators are used for automatic or manual remote control of servomotors Valves with electrical actuation, with those for valve adjustment required energy is taken from an intrinsically safe supply network. From the requirement of the intrinsic safety of the plant shows that the transmission power of the supply network must not exceed 3 ··· 5 W · This requirement is thereby conditional that the scrap lines are laid in rooms, coarse atmosphere contains coal dust and mine gas, which is known are explosive

mn

The automatic or remote-controlled expansion and mining machines usually have a large number of hydraulic valves with electrical actuation, depending on the sequence the dismantling and the operational behavior of the expansion * or the mining machine can also be switched on at the same time

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no longer about one. Intrinsically safe network transmit · From this Basically, the usual valves are not suitable for

in

set in mechanized shaft construction and mining machines.

An electrically operated hydraulic valve is known for use in rooms at risk of explosion, preferably for controlling hydraulic servomotors in the

in mechanized shaft construction and mining machines, which basically consists of an electric actuator with an explosion-proof housing fed by an intrinsically safe supply network and a hydraulic valve mechanically connected to the actuator (see, for example, German patent specification No. 969 107, class 4? g, 45/02) .

The disadvantage of this valve is that the low Power (3 ... 5 W) of its actuator, not sufficient for the development of high actuating forces on the breech block, per Another disadvantage of the valve is the impossibility of feeding several valves from an intrinsically safe one at the same time Network.

The aim of the invention is to eliminate the disadvantages «

The invention was based on the object a To develop a hydraulic valve with an electric actuator that has a high output (approx. 10 to 20 W) and thus developed a high actuating force and its power consumption from the food set is so small that the food network enables the simultaneous actuation of several> \ (Ten or hundred)

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it tolerates valves connected to it without the too transmitted power exceeds 5W.

The task set is achieved by an electrically operated hydraulic valve for expiosiJxLe environment media, preferably by a control valve for servomotors in the

solved in mechanized shaft construction or mining machines, which has an electric actuator enclosed in an explosion-proof housing and a hydraulic valve mechanically connected to this.According to the invention, the valve contains a collector for supplying the actuator, which is connected to the supply network via a current limiting resistor.

The idea of the invention is illustrated below using a few exemplary embodiments explained in more detail with reference to the accompanying drawings. It shows;

Fig. 1 shows an electrically operated hydraulic valve according to the invention with an electromagnet as an actuator in longitudinal section j

Fig. 2 shows the circuit of the actuator of a solenoid-operated Valve;

3 shows an electrically operated hydraulic valve according to the invention with an electric micromotor as Actuator in longitudinal section |

4 shows the circuit diagram of the valve as an electrical one Drive applied micro-electric motor

BATH ORIGINAL

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As can be seen in the drawing, the actuator of the valve can either be an electromagnet (Fig. 1, 2 ) or a geared micromotor (Fig. 2> 1 4). The Mkromotor developed higher control forces at the valve closure body than the magnet \ but has the disadvantage of the longer Stellaeit.

The valve shown in Pig x 1 ₉ 3 initially has a valve housing 1, in which a closure body 2 is arranged. The closure body has the task of closing the inlet channels in the valve housing through which the working fluid can pass from the hydraulic pump to the hydraulic motors of the expansion or mining machine.

The actuator of the valve according to FIGS. 1 and 2 is in an explosion-proof housing for? arranged and consists basically from a collector 8 and one fed by this Electromagnet 6 · The magnetic core 7 is mechanically connected to the Closure body 2 connected. Ge ~ to the actuator of the valve hear further the limitation swider st and 9 (Fig. 2) for charging current of the collector, the changeover switch 10, the limiting resistor 11 (Fig. 2) for the coil current of the Iv. Magnet, the actuating button 12, the actuator and the bushing 13 for the intrinsically safe feed and control power lines.

The actuator of the hydraulic valve according to Fig. 3, 4 is arranged in an explosion-proof housing 14 and basically consists of a collector 1? and one on this one

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connected micromotor 15. The motor shaft is via a Gearbox and a self-locking linkage 16 with the lock body 2 of the valve connected · To the actuator of the valve also include the limit switches 18 for stopping the motor when the closed and open positions of the valve are reached, an accessory 19 for reversing the motor, a cable bushing 20, a current limiting resistor 21 (Fig. 4) of the collector and an operating button 22..

The actuator is powered by a power source 24 via intrinsically safe. Lines 23 fed.

The hydraulic valve according to FIGS. 1, 2 has the following mode of operation.

In the initial state, when the circuit of the magnet is interrupted, the closure body 2 is in its lower Fixed position in which the inlet channels 3 are covered will.

The valve is opened by pressing the Control button 12 initiated, mechanically, for example by the mining machine, or electrically,. For example via Remote control that can be operated

When the button 12 is actuated, the magnet 6 is excited by the current from the collector 8. The magnetic core 7 moves upwards against the resistance of the spring 4 and brings the closure body 2 of the valve into a position * ·., In which. the inlet channel · 3, through which the hydraulic fluid flows into the «VentilgtMui ·« ·

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When the upper limit position is reached, the core opens the limit switch 10, which causes the current limiting resistor 11 switched into the circuit of the magnet 6 in series will·

Thus, the Elektromagent 6 takes in the Au _-; genblick the excitation a high starting current from the battery, which can develop the required for opening of the valve, high actuating force on the closure body · In the upper limit position of the core 7 of the current through the resistor 11 until the hold value is reduced.

The collector 8 is continuously recharged from the intrinsically safe supply network via the limiting resistor 9

The mode of operation of the valve according to Fig. 1 is as follows

In the initial state, when the supply circuit of the Riikromotors 15 is interrupted, the closure body 2 of the Valve held by the self-locking linkage 16 in its lower position, in which the inlet channels 3 of the Valve are blocked

The micromotor 15 is driven by the collector 17 through the limit switch 18 (on the right in Fig. 3) switched off.

The required to operate the limit switch 18 The lift reserve is guaranteed by the elasticity of the linkage 16.

The release of the inlet channels 3 is brought about by closing the contacts of the actuating button 22. These contacts can be activated both by direct actuation of the button ea 22

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or can be closed electrically via remote control By closing the button contacts, the coil of the relay 19 is traversed by current and the working contacts 25 this Close Heiais. This makes the kotor 15 in the sense of Anne Exercise of the closure body 2 switched on.

After reaching the upper limit position of the closure body 2, the motor 20 is activated by the limit switch 18 (on the left in Fig. 3) switched off.

The closure body 2 remains in its upper position, as long as the button 22 is pressed. If the button is now released so open the button contacts in the circuit of the relay 19, whereby the contacts 25 in the circuit of the motor 15 be opened. The Iviotor is now reversed and the inlet channels 3 are locked again.

The recharging current for the collector 17 is obtained from the intrinsically safe circuit 23 via the limiting resistor 21. The resistor 21 ensures the limitation of both the charging current of the collector 17 and the return current from the collector 17 into the feed network 23.

An electric I ^ ikromotor has as an actuator opposite the magnet has the advantage that it has a higher actuating force on the closure body and thus a higher reliability of the valve is guaranteed. Another advantage of the said engine is in its more favorable behavior, in which the one on the Versojilusskörper developed actuating force is independent of the adjustment path. Since the motor continues only for the time of the VerschluBkorperVesstelV

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treatment is switched from one border position to the other, its power consumption from the collector is lower than that of a magnet. -

A corresponding increase in the positioning time (up to 2 ·. · 5 sec) a valve equipped with a micromotor versus a solenoid-operated one Valve plays for hydraulic servomotors

in no role in shaft construction and mining machines.

An important advantage of the hydraulic according to the invention Valve with electrical actuation compared to the known devices of this type is several times higher Actuating force that is achieved by increasing the performance of the actuator. The further advantage is that the invention Valves connect to a supply network in large numbers (up to over a hundred) and at the same time can be operated without the intrinsic safety of the power supply system disturb. '

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Claims (1)

ρ, August 21, 1969 , ν - w.i! te Gp / fa ZELUUT, N & LUYKEN _{p 23} ^ ₂ SQOO Munich 22 _ q _ o - ^ - - ^ 942677 PATEN APPEAL! Electrically operated hydraulic valve for use in potentially explosive media, preferably a control valve for servomotors in mechanized shaft construction and mining machinery, with one in an explosion-proof Housing enclosed and powered by an intrinsically safe network electrical actuator and with a mechanical with the actuator connected hydraulic valve, characterized by a collector (8, I7) for Supply of the valve actuator, which is connected to the supply network via a limiting resistor (9 or 21). 109810/1090 Blank page