DE2716762A1 - CONTROL CIRCUIT FOR A PNEUMATIC SLIDING REGISTER - Google Patents

Description

PATENT LAWYERS

MANITZ. FINSTERWALD & GRÄMKÜW

Munich, April 15, 1977 Erb - T 2103

LA TELEMECANIQUE ELECTRIQUE

33bis avenue du Marechal Joffre, 92002 Nanterre

France

Control circuit for a pneumatic shift register

The invention relates to a control circuit for a pneumatic shift register, in which this is made up of the series connection of Phase cells, each of which has a pneumatic AND gate and a magnetic bistable pneumatic accumulator according to French patent application no. 71.3074-6 of 18. August 1971 (Pneumatic storage relay with magnetic latching (accrochage magnetique)), with each Step the register through two adjacent cells (one cell in the odd numbered position and one cell in the even numbered position Position) and the advancement of a signal occurring at one of the cells by alternating application a control pressure to the input ports of all AND gates belonging to the cells of the odd-numbered position, and then of all AND gates belonging to the even-numbered cells is reached.

DR. G. MANlTZ · DIPL.-ING. M FiNSTERWALD DIP L. -IN C. W. C R AM KOW ZENTRALKASSE (AVER S MÖNCHEN 32.RO KE RT-KOCH-ST R ASSE 1 7 STUTTGART 50 <BAD CANNSTATTI MONKS. ACCOUNT NUMBER 7370 TEL. (0891 22 42 11. TELEX 3-29673 PATMF SEELBERGSTR. 33/35. TEL. (0711 156 73 61 POSTSCHECK. MÖNCHEN 7 7 O6 2 - 80S

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An embodiment of such a register is in the French patent application "Control circuit for a pneumatic Phase cell and module for its execution "described concurrently with the present application became. In this embodiment, operational uncertainties resulting from the slow disappearance are avoided of the pressure on the even-numbered and odd-numbered lines.

In this solution, a two-way distributor is used that alternately feeds the even-numbered and the odd-numbered ones Line causes, as well as phase cells, each of which has a complementary blocking AND gate, so that the The cost of such a circuit can become very high if the register has a large number of steps.

The aim of the invention is to find another solution to the difficulties to create, on the one hand, from the non-instantaneous disappearance of the pressure, its appearance cause uncontrolled advancement of the register and result from the use of fluid interrupters, which are less complicated than the S5 two-way distributors.

According to the invention this is achieved in that the odd Route and the even-numbered route with the output of a first or a second pneumatic threshold relay are connected, which also each have a feed input and a control input that connects between the feed inlet and the outlet causes when the pressure occurring here is lower than a pressure threshold, which is well below the control pressure of the accumulator that the even-numbered line with the control input of the first Relay is connected and that a constant pressure is applied to the feed input of the second relay, during the Control input of the second relay and the feed input of the

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the first relay is connected to the output of a pressure interrupter, which supplies a pressure signal in the form of a pulse, which changes between a feed pressure and an outlet pressure.

Further details of the invention emerge from the following description, in the attached drawing Is referred to. Show it:

1 shows a schematic representation of the design of a shift register which is assigned to a control device is,

Fig. 2 shows an embodiment of the relay with a lower release threshold (seuil de depilotage),

Fig. 3 shows the course of the pressure changes in the inventive Circle and

4 shows a modified circuit.

The shift register 101 of FIG. 1 essentially consists of a connection of phase cells 1, 2, 3 »4, 5» ··· » each phase cell containing a bistable memory 6, the positions of which are magnetically stabilized, and an AND gate 30 used in the French Patent application No. 71.35894 dated September 29, 1971 (components for the formation of pneumatic logic blocks).

This memory is equipped with a permanent feed line 7 » with a line 8 for transition to the logical state "1" and with a line 9 for restoration of the logic state "0" and has an output line 10 in which the logic states are processed be, as well as an outlet line 11. The output of the memory is with a reset opening 12, with a Exit opening 13, which is closed in this application

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is, and with one of the inputs 14 of a pneumatic AND gate 30 connected, the other entrance, called confirmation entrance (entree d'acquittement), with the opening 151, 152 ... is connected. The output of the AND gate is itself connected to an opening 16 which provides an advance signal when the AND gate is conductive. An organ 20, which is arranged at the left end of the register causes the opening 12 of the first cell to close, which connects the Feed line 7 with a constant pressure source 26 and connects the channel 8 with a pneumatic signal source 40, which becomes active when a certain phenomenon occurs.

The confirmation openings 151, 152, 153 «·· of the following Cells are, depending on whether they belong to cells of odd-numbered position or of even-numbered position, with an odd-numbered one Line 3I or an even line connected.

The unit 21, drawn by a broken line Surrounded by a rectangle, represents a pneumatic logic circle, which has a signal input channel 22 and two signal outputs 23 and 24 and forms a circle that alternates Excitation of the even-numbered and odd-numbered lines caused by means of a simple reversing device, wherein the safety of the operation is guaranteed.

The input 22 is connected to a simple pneumatic reversing element 45, which this input with the constant pressure source 26 or outlet 47 to deliver a short pulse when the actuator 48 of the reversing member is acted upon by one of the cams 49 of a device 50 advancing step by step.

The outputs 23 and 24 of the circle 21 are with the odd numbers and even lines connected.

Inside the unit 21 are two threshold relays 33 and

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intended. Each of these relays has a feed input 28 or 29 and a control input 27 or 25 »where the The former serve to absorb a relatively high feed pressure which is routed to the outputs 25 and 24 of the relays when the control pressure at the control inputs is lower than a pressure threshold that is considerably lower than the feed pressure is.

Channels provided between the individual gates establish the following connections:

- The output of the first threshold relay 33 is connected to the output 23 and thus; connected to the odd-numbered line 31 :

- The output of the second threshold relay 34 · is with the Output 24 and thus connected to the even-numbered line 32:

- The control input 25 of the first relay is connected to the output of the second relay 34;

the input 28 of the second relay is connected to the constant pressure 26;

- the input 29 of the first relay 33 and the control input 27 of the second relay are connected to the input 22 of the unit and consequently to the output of the reversing element 4-5 .

Each relay is designed so that when it is conductive and in its steady state, its output associated with constant pressure and when it is not is conductive, the output is connected to an outlet opening E.

The shift register operates as follows: If, for example, as a result of the location of a defective part 41 a pressure signal coming from the observation probe 40 at the input 8 at the first phase cell 1, registration cell

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called occurs, the memory 6 assumes its logic state "1". When this determination is made, the breaker becomes 45 not by one of the cams 49 of the incrementally movable Disk 50 of the machine is operated and as a result no pressure signal is applied to the input 22, which makes the threshold relay 33 non-conductive and, on the contrary, the conductive state of relay 34 · causes.

The odd-numbered line is consequently without pressure, in contrast to the even-numbered line.

It follows from this that the AND gate 30 of the first phase cell, which only receives a signal coming from the memory, remains non-conductive and is in its write-in state.

The transmission or advancement of the information obtained takes place at the moment when the interrupter 45 applies pressure to the unit 21 as the disc moves and the odd line is pressurized while the even line is depressurized. The AND gate 30 now becomes conductive and lets the memory 61 of the phase cell 2 toggle into the logic state "1", the output 81 of the phase cell 2 resetting the previous memory to the logic state Ό ".

It can be seen that the register transfers its contents to the neighboring cell 3 very quickly when the AND gate is activated at the time of this transmission at its input 152 by a sufficient residual pressure.

This possibility is excluded by the locking circuit 21, which operates in the following way, the initial condition being the connection of the input 22 to the outlet 47 of the interrupter and thus the presence of pressure on the even line 32 and the complete absence of pressure on the odd-numbered line 31 accepts:

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When the rotation of the disc 50 activates the 3 breaker 45 causes, this transmits a pressure to the input 22, the on the one hand is transmitted to the input 29 of the relay 33 without generating an output signal, since the .Druck at 25 the same as

urra the exit is blocked,

at 24 and 32 / and on the other hand, ¹ V is transmitted to the input 27 of the relay 5 , which assumes its blocked state when a certain pressure threshold, called the control threshold, is reached, this threshold being above the de-control threshold defined above. If the pressure at the output 24 falls through an internal connection of this output with the outlet E of the gate 34 until the de-control threshold is reached, the input 25 of the gate 33 allows its conductive state and thus causes the pressurization of the odd-numbered line through its connection with entrance 22.

When the disk has rotated so far that the actuation of the interrupter 45 is interrupted, the line 22 is with connected to outlet 47. The odd-numbered line is now emptied first via the line belonging to the relay 33 Line 22 and then via outlet E when the pressure at input 22 is equal to or less than the release threshold has become. The input 27 of the gate 34 leaves the Transfer of the fluid coming from the constant feed 26 to the even-numbered line. 32 to and causes as a result the application of a blocking signal to input 25 of the Relay 33 'which confirms that line 31 has zero pressure.

The change in pressure on channels 22, 31 and 32 is shown in Fig. 3 shown, which will be explained below.

A practical implementation of a threshold relay 33 or 34 is shown in Fig. 2, in which 101 represents the body provided with openings 102, IO3 and 105, which the entrances and Outputs 28-29, 25-27 and 23-24 correspond to the previous figure.

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The interior of the body essentially contains a valve 106, that between two seats 107 and 108 in a first chamber 109 which is connected to the opening 105 is movable. One Deformable membrane 110 is located between a second chamber 111 which communicates with the opening of the first seat stands and is connected to the outlet 112, and a third chamber 113, which is connected to the port IO3, while a conduit connects port 102 to chamber 104, in which a calibrated opening 114, which is the opening of the Seat 108 is, the chambers 104 and 109 connects with one another. An opening 115 also connects at the level of the seat 107 the chambers 111 and 113 and allows the attachment of a plunger 118 which penetrates this opening.

The diaphragm 110 is so flexible that it pushes the plunger 118 attached to the valve in the direction of closing the valve 108 can operate when there is sufficient pressure in the chamber 113.

The tubes 128, 119 and 116 are held in place by annular clamps (not shown), the claws of which are theirs Hold the circumference while the seal is ensured by the bead rings.

In the following the operation of the relay is described, whereby the in Pig. 3 pressure changes shown for comparison can be used.

If two high pressures occur simultaneously at the inlets 102 and IO3 (FIG. 2), the valve 106 closes the opening 114, since the diameter of the membrane 110 is larger than that of the opening 114. If the occurring at the control input 103 Pressure decreases until it reaches a certain threshold S. Called the de-control threshold, the valve 106 is moved upward in the figure and between the feed inlet 102 and the outlet 105 there is a fluid passage.

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The de-control threshold is determined by the ratio of the diameter the opening 114 and the membrane 110 and determined by the ratio of the pressures occurring at 103 and 102 to one another.

On the other hand, since the pressure remains at 103, it is necessary to that the pressure at the opening 3 reaches a certain value which is higher than the release pressure (which the Control threshold Sp) so that the valve has a lower position assumes and the output 105 receives no more pressure, wherein the threshold Sp now by the ratio of the diameter of the Membrane 110 and the seat 107 is determined to one another.

When the pressure at IO3 decreases, the upward movement of the Valve only takes place at the very low pressure, which is determined by the ratio of the diameter of the opening 114 to the diameter the membrane 110 is determined.

Although the design of the two threshold relays 33 and 34- the same and the one in Pig. 2 corresponds, their mode of operation is not the same, since the first relay 33 receives variable pressure signals at its two inputs, while the second relay 34 at its first input 28 a Receives signal of maintained pressure.

The operation of the relay in its position 34 of FIG. 1 will now be described with reference to FIG. Assuming that the input 102 or 28 is fed with pressure, the following phenomena occur: If there is no signal at the opening IO3 (input 27), the connection between the opening 102 (input 28) and the opening 105 (output 24) produced. When the pressure at the opening 103 (27) _{increases to a value S 2} , which is determined by the values of P (constant pressure) and the ratio of the surfaces of the membrane and the seat 7 to one another, the valve interrupts the connection between the A-

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passage 102 (28) and the output 105 (24). This value S ₀ is called the "control threshold".

If, if the pressure P persists at the opening 102 (28) as the pressure applied to 103 (27) decreases, the valve rises 106 to establish the connection of the input 102 (28) and the output 105 (24) only at a value S due to the ratio of the surfaces of the membrane and the opening 114 of the seat 108 is small to one another. This value S ^, the is below Sp, is called the "de-control threshold".

The operation of the relay 33 depends on the relative change in the inputs 25 and 29, i.e. the openings 103 and 102 of FIG. 2 applied pressures.

The sequence of the individual phases is shown in FIG of the relationship between the passing phenomena and the constant apparitions was exaggerated.

When the first inlet 29 (102) in FIGS. 2 and 1 is under pressure and the pressure occurs at the second inlet 25 (103) or disappears, the operation is the same as that of the relay 34 described.

Conversely, if the pressure at 29 (102) decreases from a high value (point A) before the pressure at 25 (IO3) decreases from a value Zero increases from (point B), there is first an emptying of the outlet 23 (105) and thus the line 31, which is under pressure stood at the entrance 29 (102) instead. If the difference between the pressure at inlet 29 is the same as at outlet 23 is (points O and D), and the pressure reaches a certain value at 25, the valve closes the seat 108 to the outlet 23 to connect to the outlet E (112), which causes an acceleration of the emptying of the line 31 and the non-conductive State of relay 33 confirmed.

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P-

As a result, the line 31 cannot have a pressure at this point in time which is above the threshold S _x . is, because at the time points G and D occur, the residual pressure S on line 22, which is the same as the pressure at point C on line 31, is already below threshold S _x . lies. An additional improvement of the circuit described above is, according to FIG. 4, that the signal of the interrupter 45 is transmitted to the second input 27 of the second relay ⁷ A via an OR gate 60 with an output 65 and two inputs, the first input 62 is connected to the input line 22 and the second input 64 is connected to the output of the first AND relay 33 via the line.

This circuit operates during the period of pressure increase on line 22 in exactly the same way as the circuit described above, because the OR gate behaves like a direct line, since line 2 5 is under pressure.

When line 23 has been pressurized, the signal applied to line 63 confirms the conduction of the OR gate.

If the line 22 when the interrupter 45 is emptied, but in the case of Fig. 1, there may be a residual pressure in the line 23, 31 when the relay 34 is conductive is, for example, if its deregulation threshold is above its normal value or if the the section of the line 22 leading to the input 27 is emptied faster than the section leading to the input 29.

Thanks to the OR gate 60, any residual pressure in the line 23, 31 is applied to the relay 34 in order to block its opening and consequently avoid any simultaneous pressure on line 24.

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If the speed of the transfer of the register is to be increased, the interrupters 4-5 must be shorter and closer to one another Ii eg end impulses that a faster emptying of the channels, in particular the odd-numbered channel. For this purpose one can use one known signal regeneration circuit 83 (Fig. Ό in the line between the breaker 4-5 and the inputs Use 22 of the threshold relays 33 and 34- and in their vicinity, which has an outlet opening 84 which allows rapid emptying of the portion of the channel 22, 23, 31 which between this circle and the inputs of the AND gates of the phase cells.

- patent claims -

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Claims (4)

Claims 1. Control circuit for a pneumatic shift register, which is formed by the series connection of phase cells X3t, each of which has a bistable pneumatic memory, the switching to the logic state "1" is effected by a control pressure, and a pneumatic AND gate, with each step of the register is formed by two neighboring cells, a cell of odd-numbered position and a cell of even-numbered position, and the advancement of a signal occurring at one of the cells by alternately applying a control pressure to the input openings of all AND gates belonging to the cells of odd-numbered position and then all AND gate belonging to the cells in an even position is achieved, characterized in that the odd-numbered line (31) and the even-numbered line (32) are connected to the output of a first pneumatic threshold relay (33) and a second pneumatic threshold relay (34), respectively each having a dish eeingang (29 or 28) and a control input (25 or 27), which causes the connection between the feed input and the output (23 or? Λ) when the pressure occurring at this point is lower than a pressure threshold that That the even-numbered line is connected to the control input of the first relay and that a constant pressure is applied to the feed input of the second relay, while the control input of the second relay and the feed input of the first relay with the output ( 22) of a pressure interrupter (4-5) are connected, which supplies a pressure signal in the form of a pulse that changes between a feed pressure and a discharge pressure. 709843/0964 original inspected 2. Control pressure for a pneumatic shift register according to claim 1, characterized in that the two threshold relays O ⁷ >, 34) are designed the same and each have three successive chambers (111, 109, 104), two successive chambers through an opening (11S or 114) connected to one another in that a valve (106) is arranged in the central chamber (109) between two seats (107, I08) in order to optionally close the first opening (115) or the second opening (114), wherein the chamber (109) is connected to the outlet opening (105), that the chamber (104) connected to the second opening (114) is connected to the feed opening (102) of the relay, that the third chamber (111) is connected to the outlet (112) and is closed by a deformable membrane (HO), the first surface of which transmits its movements to the valve via the first opening (115), while the second, opposite surface transfers the D supplied to the control input of the relay jerk receives, and that the diameters of the membrane (110), the first opening (115) and the second opening (114) have decreasing values. 3. Control circuit according to claim 1, characterized in that the control input (27) of the second threshold relay (34) is fed through the output (65) of a pneumatic OR gate (60) with two inputs, the first input (62) of the OR gate (60) with the output (22) of the control breaker (45) and the second input (64) is connected to the output (23) of the first relay (33). 4. Control circuit according to claim 1, characterized in that a signal regeneration circuit (83) in the line between the interrupter (45) and the inputs (22) of the threshold relays (34, 33) is arranged in their vicinity 709843/0964 and an exit occurs so openly; (8'l ·) that owns the fast Emptying of the between the oignal regeneration circuit and the inputs of the AND gates located part of the line (22, 23, 31) allowed. 709843/096 /.