DE2344207A1 - CONTROL DEVICE WITH TWO HANDED OPERATION - Google Patents

Description

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Patent and

Utility model assistance application

ROBERT BOSCH GHBH, - STUTTGART Control device with two-hand actuation

The E: invention relates to a compressed air operated control device with two-hand operation for one or more consumers, such as working pistons of a machine tool, in particular a press, with two manual buttons, preferably 3/2-V / egeventile at least approximately simultaneously for generation a control signal are to be triggered.

Such control devices serve as safety devices; Since the operator working on the machine tool, for example on a press, uses his two hands to initiate the working movement of the machine, he cannot be injured by the tool. So that the operator cannot trigger the control device with one hand - for example by locking in a manual button in its position triggering the control signal - which would cause the safety device to lose its meaning , is one in the control device

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Safety lock included. This safety lock can only be achieved by simultaneous or at least approximate trigger simultaneous actuation of the hand switch. Such control devices are "known. However, they work in usually with electrically controlled solenoid valves. These control devices are very expensive. It is also already a pressure fluid operated control device with two-hand operation known, which, however, has only been realized with the help of a special valve. Therefore this is also Control device relatively expensive.

The object of the invention is to create a control device of the type described at the beginning, which is simple Type and method can be realized with known, conventional, pneumatic components.

This is achieved according to the invention in that three compressed air actuated 5/2-way valves with spring return are used of which each 5 / ^ - way valve part has an actuation connection, has three inputs and two outputs that in the zero position the first output with the second Input and the second Aizsgang connected to the first input and the third input is blocked while in the second switching position the first output with the third input, the second output is connected to the second input and the first input is blocked, and that of the first 5/2-way valve the actuation connection with the first hand switch, the first input is vented, the second input with the second manual button, the third input with compressed air feed line, the first output via a timer with the first input of the second 5/2-way valve and the second output is connected to the first input of the third 5/2-way valve that the second 5/2-V / egeventil The second input is vented, the third input with the compressed air supply line, the first output with the consumer and the second output is connected to the actuation connection of the third 5/2-way valve and that the third 5/2-way valve

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till the second inlet exhausts - and the second outlet with it the actuation connection is connected to the second 5/2-way valve is.

This leaves the control device mentioned at the beginning very easy and therefore economical to manufacture.

It is very advantageous that the timing element of an, in particular non-adjustable, one-way flow control valve is connected downstream Volume is formed. It is also very advantageous that the three ^ / 2-Vegevents and the timing element on a channel guide plate, in particular two valves are arranged on the top side and two valves on the bottom side. This allows the control device to be very compact Train trained control block.

Further advantageous embodiments of the subject matter of the invention result from the description and the drawing.

Ei η Ausführungsbcιαχή el of the invention is in the drawing shown. Tuck shows in

Tig. 1 with the circuit diagram of a control device

Two-hand operation and in Fig. 2 one realized as a compact control block

Control device.

iJie shown in Fig. 1 control device is used for control a working piston operated with compressed air 1 one not machine tool shown in more detail, such as a press. The control device has the task of preventing hand injuries prevent dangerous closing movements of the machine tool, by forcing the operator to keep his hands outside the danger zone. The control device consists of a control block 2 and two separately arranged manual buttons 3 »4 ·, which are designed as 5/2-way valves are.

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The compressed air for operating the working piston 1 is from a any compressed air source - here from a compressor 6 driven by an electric motor 5 - via a compressed air supply line 7 taken. The two hand buttons 3, 4- are shown in Fig. 1 in their zero position, in which they do not Generate control signal. The outputs of the two hand buttons 3, 4 are connected to the control block 2.

The control block 2 is formed by three compressed air operated 5/2-way valves 8, 9 »10 with spring return. Each of the 5/2-way valves has an actuating connection Z, three inputs S, P, R and two outputs A, B. In the zero position shown in FIG. 1, each of the 5/2-way valves 8, 9-10 is the first output A is connected to the second input P and the second output B is connected to the first input R. The third input S is blocked. In the second switching position, the first output A is connected to the third input S and the second output B is connected to the second input P, the first input E being blocked.

(In the following, the reference letters of the connections of the 5/2-way valves (8, 9i 10 are each used with an index corresponding to the reference number of the valve.) The actuation connection Z _{R. of the} first 5/2-way valve is connected to the output of the first manual button J. The first input Rq is vented, the second input P _g is connected to the output of the second hand switch 4 and the third input Sg is connected to the compressed air supply line 7. The first output A _{R of} the first 5/2-way valve 8 is connected via a timing element 11 is connected to the first input Rq of the second 5/2-way valve 9, while the second output B ~ of the first 5/2-way valve 8 is connected to the first input _{R.Q of} the third 5/2-way valve 10. The first input Pq is vented from the second 5/2-way valve 9 and the third input Sq is in turn connected to the compressed air supply line 7. The first output An of the second 5/2-way valve 9 is connected to the working piston 1 and the second output Bg with d em actuation connection

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Z ^ q of the third 5/2-way valve 10 connected.

The second input P ^ is vented from the third 5/2-way valve 10 and the second output B ^ "with the actuation connection Zq of the second 5/2-way valve 9 is connected.

The mentioned timing element 11 is not a st el 1ΐ> ar en one-way flow control valve 12 and a downstream volume 13 formed. '

The three 5/2-V / ege ν elements shown in the circuit diagram in FIG. 1 8, 9j ΊΟ and the timer 11 are on a channel guide plate 14 arranged such that two valves 8, 9 on the top of the channel guide plate 14 and two valves 10, 11 screwed on the underside of the Kanalführurigsplatte 14 are. The measures create a very compact control block.

The function of the control device is as follows: At output Aq - which forms the output of control block 2 - is only pressure if at least approximately from the manual buttons 3i 4 control signals have been generated at the same time. When the manual button 3 is actuated, the first 5/2-way valve 8 in moves its second switch position. In this switch position Compressed air reaches the timer from the supply line 7. A short time later, the operator must press the second hand button 4 generate a control signal, which finally the second 5/2-way valve 9 in its second switching position brings, in which the connected to the timing element 11 first input Eq of the second 5/2-way valve 9 is completed. That The control signal generated by the second hand switch 4 must come so quickly that at the first input Eq of the second 5/2-way valve 9 there is still no pressure signal that has come via the delay element 11. The second 5/2-V / ege valve is now located in its second switching position, the compressed air supply line becomes 7 compressed air is fed to the working piston 1 via the third input Sq and the second output Ag,

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which is thereby wetted in motion.

If the control signal generated at the second hand switch 4- comes after a time determined by the timer 11 has elapsed, the third 5/2-way valve 10 would be brought into its second switching position, in which the first input E ^ _{0 of} the third 5/2 -Way valve 10 is blocked. As a result, the second 5/2-way valve 9 could no longer be brought into its second switching position; it would wait in its zero position ve! ", in which the first output A ₍ ., which is connected to the working piston, is vented via the second input Pq.

If one of the two control signals generated at the pushbuttons 3, ^ is briefly interrupted, it is; there is no longer any pressure at output A _0. Actuation of the working piston 1 is only possible again when both hand buttons 3, -Ί- have returned to their starting position in which the lines leading to the connections Zq and P have been vented and have been ventilated again at least almost simultaneously .

If a component fails (e.g. a! '''Wire breakage), the control device can no longer be triggered or only once, but only if the hand is operated correctly, vice 3> ¹ V.

Of course, it is not necessary for the output Aq of the control block 2 to be connected directly to a working piston 1. as well valves can of course also be controlled.

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Claims (3)

Expectations "U Drucklxiftbe operated control device with two-hand actuation for one or more consumers, such as working pistons of a machine tool, in particular a press, whereby two hand buttons, preferably 3/2-way valves are to be triggered at least approximately simultaneously to generate a control signal, characterized in that three compressed air-actuated 5 / P-Uegeventile (8, 9, 10) with spring return can be used, of which each 5/2-way valve has an actuation end (Z) / three inputs (S, P, R) and two outputs (A, B) that in the zero position the first output (A) is connected to the second input (P) and the second output (B) is connected to the first input (R) and the third input (S) is blocked, while in the second switching position the first Output (A) is connected to the third input (S), the second output (B) is connected to the second input (P) and the first input (E) is blocked, and that the actuating connection of the first 5/2-way valve (8) (Zq) with the first hand button (3) * the first input (Rg) is vented, the second input (Pg) with the second manual button (O _1, the third input (Sg) with a compressed air supply line (7), the first output (Ag) via a timer (11 ). with the first input (Rq) of the second 5/2-way valve (9) and the second output (Bg) with the first input R ^ ₀ ) of the third 5/2-way valve (10) is connected that of the second 509810/0177 - 8 - - 8 ~ E. 1 7 O 5 5/2-way valve (9) the second input (Pq) vented, the third input (Sq) with the Druckliiftziifleitungsleitung (7), the first output (Aq) with the consumer (1) and the • second output (Bq) with the actuation connection (Z ^ ₀ ) of the third 5/2-Vegeventils (10) is connected and that of the third 5/2-Vegeventil (10) the second input (P ^ ₀ ) is vented and the second output (B ^ ₀ ) with the actuation connection (Zq) of the second 5/2-way valve (9) is connected. 2. Control device according to claim 1, characterized in that that the timing element (11) from a, in particular not adjustable, One-way flow control valve (12) is formed with a downstream volume (1J). 3. Control device according to claim 1 or 2, characterized in that that the 5/2-way valves (8, 9, 10) and the timing element (11) on a channel guide plate (14), in particular two valves (8, 9) on the upper side and two valves (10, 11) the underside of which are arranged. 509810/0177