DE2343848A1 - CONTROL UNIT FOR A FLOATING DEVICE - Google Patents

Description

DR. BERG DIPL.-ING. STAPF DIPL.-ING. SCHWAbE DR. DR. SANDMAIR

8 MÜNCHEN 86, POSTFACH 86 02

Attorney file 24 204 August 30, 1973

Ciba-Geigy AG Basel / Switzerland

Control unit for a floating device

The invention relates to a control unit for a reciprocating device, in particular one which is controlled by means of a Pluid logic circuit. Fluid is to be understood herein as a gaseous or liquid pressure medium.

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P (0811) 98 82 72 8 Munich 80, MauerklrcherstraBe 45 Banks: Bayerfeche Vereinsbank Manchen 453

<089> 98 70 43 Telegrams: BERGSTAPFPATENT Munich Hypo-Bank Munich 389 2623

983310 TELEX: 0524560 BERQd Postscheck Munich 65343-808

To make the various movements on floating To determine or feel devices, pneumatic limit switches or limit switches operated by compressed air were used; in chemical Systems, the use of limit switches on the devices has the major part that the moving Parts may soon be clogged with chemicals, or that Chemicals can adhere to them, which leads to errors and malfunctions in the system.

According to the invention, a device, in particular of the type mentioned at the outset, is to be created that does not have any has mechanical, moving parts that belong to the chemical plant or those manufactured and / or processed therein Are exposed to substances, and which also has greater reliability and requires less maintenance and care than this is the case with known devices.

According to the invention is a control unit for a reciprocating device, which by a in one Cylinder reciprocating piston is driven, characterized by a cylinder with a piston, an inlet for supplying pressurized fluid to one end of the cylinder, the other end of which is ventilated or to the environment is open, and at least four, at different distances from the inlets spaced outlets for the pressurized

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has standing fluid, the two outer and the two inner outlets in pairs by means of a fluid logic hold are coupled together such that when pressure is applied to the outlet furthest from the inlet, the piston is caused to move towards the inlet while, when there is no pressure at the outlet closest to the inlet, the piston is caused to shift away from the inlet, and wherein the inner pair of outlets are arranged so that a Operation of the device is affected if pressure is only present at the outlet closer to the inlet.

The control unit can have one or more cylinders. If the control unit has a cylinder, it is pressurized set fluid supplied to the cylinder at its piston crown end. The supply of pressurized fluid is known as Energy supply by means of which the piston is pushed out. The piston returns to its original position under the action of a spring.

If two cylinders are provided, the cylinders are fixedly connected to one another ₉ by the cylinder holding device and at the piston rod ends so that the piston rods move together. In a control unit with two cylinders, one of the cylinders is referred to as a "working cylinder". This is the cylinder on which one is on one side

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of the piston, which is moved back and forth in the cylinder, the main drive energy is alternately supplied; the size and the stroke is generally determined by the available pressure and the required work to be performed.

The other cylinder has the outlets and is called "position ^{detector 11} ; this cylinder must have a stroke that is at least as large as the working or operating unit. The cylinder called" position detector "is generally smaller than the working or operating unit Operating unit, and although the bore of the ^{cylinder called "position detector 11} " should be as small as possible, it should have a sufficiently large diameter so that it can be held firmly and immovably _e

If there are three or more cylinders, one of these cylinders is the working cylinder, one serves as a position detector, and the remaining cylinder or cylinders are control cylinders, which can be filled with hydraulic fluid.

In a control unit with only a single cylinder, the outlets are arranged at different locations along the cylinder. In a unit with two or more cylinders, the outlets are arranged at different locations along the length of the cylinder used ^{as the "position detector 11".}

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four outlets are provided on the cylinder; it can but also, if required, more outlets are available, so that finer changes in movement, such as for example Hi, n and forward movements, are then carried out with the control unit can be.

The outlets can be connected to the fluid logic circuit by means of pipelines be connected.

In all of these control units, pressurized fluid is supplied to one end of the cylinder containing the outlets, while the other, opposite end of the cylinder or piston is open or vented to the atmosphere or environment. In this way, the piston is constantly on Pressure difference or a differential pressure present. Each outlet in the wall of the cylinder is, depending on the position of the piston in the cylinder, pressurized or ventilated or open to the environment. The presence or absence of pressure at the outlets can be used as information for the fluid logic circuit for operating the cylinder and, if required, for operating other mechanisms which must be synchronized with the movement of the cylinder.

The control unit can work hydraulically or pneumatically, i.e. with hydraulic fluid as well as with compressed air

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be operated «For example, this is pressurized Fluid advantageously compressed air, the control unit can at high or used at low pressures; the equipment used should, however, correspond to the pressure and medium used.

In a single cylinder unit with a return spring the pressurized supplied fluid is preferably supplied to the cylinder at its piston crown end. In a unit with two or more cylinders, the pressurized fluid supplied for control is preferred on the side of the piston rod of the cylinder called the position detector.

The use of those described above is particularly advantageous Control unit at the Pannevis filter device. This device has a moving conveyor belt, under which a reciprocating vacuum or vacuum container or box is arranged, which with the movements of the working cylinder is synchronized “means this control unit is vacuum or »negative pressure to the vacuum or. Vacuum container or box at the appropriate one Part of its movement cycle created »The control unit can also in a textile processing machine, such as be used in Vfirk, spinning and sewing machines.

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The invention is described below on the basis of "preferred exemplary embodiments explained in more detail with reference to the "accompanying drawings» They show:

Pig, 1 in section a control unit with two cylinders at the beginning of its working cycle, which are connected to a PLUID logic circuit are connected, and

2 shows a control unit with a cylinder with a pedal return.

In Mg. 1 is a working cylinder 1 with a piston 2 and with a supply line 3 for air under high pressure to a control cylinder 4 by means of a connecting rod 6 coupled with a piston 5 ·. The control cylinder 4 points a control inlet 7 for the supply of air, a ventilated end 8 or end 8 connected to the environment Outlets 9 to 12, which with the fluid logic circuit are connected, which in turn have a Sj.e: lcherglisd 13 with inputs 14 and 15 and an output 16, a locking member 17 with Inputs 18 and 19 and an output 20, an inverter or non-element 21 with an input 22 and an output 23 AND element 24 with inputs 25 and 20 and an output 26 and a cylinder relay 27 with an input 28 and an output exhibit. A ventilation valve 30 and a vacuum or

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Vacuum valve 31 are connected to the output of AND element 24 The air under high pressure is connected over Outlets 32 and 33 supplied.

In the in Pig. 1, the working cylinder 1 is at the beginning of a working cycle. The dashed Lines and areas indicate the presence of compressed air; from this it can be seen that all parts of the üteuerzylinders The compressed air is also at the inlet at; As a result, the output 23 of the inverter element 21 is switched off The output 16 of the storage element 13 is switched on due to the pressure at the input 14, and the cylinder relay is brought into a position in which compressed air is supplied to the cylinder 1 via the outlet 33 of the compressed air supply is, whereby the piston of the working cylinder is pushed out (doho in Figo 1 is printed to the left).

Due to the pressure at the inputs 18 and 19 on the blocking element 17, there is no output at the input 20 of the AND element 24. Since the AND element 24 only receives a signal at the input 25, it is located at its output 26 there is no output signal, so that the ventilation valve 30 is open and the vacuum or pressure relief valve is closed »This position can be described as the situation in which" air is missing "(the air failure condition).

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When the pistons are moved far enough to close the outlet 9 to ventilate or to bring it into contact with the environment, there are still no input signals at the storage element, but it retains its last state until its Memory status is changed o Output 16 of the memory element is still on and pressurized air is supplied through outlet 33 and the piston in the cylinder becomes pushed further out (i.e. to the left in Fig. 1). The locking member 17 is still switched off, and the control valves 30 and 31 remain in the "lack of air" position.

When the pistons have been moved so far that the outlet 10 is vented, the input to the storage element remains unchanged, and the storage output remains switched on; the piston is thus pushed further outwards in the cylinder. The input 18 is no longer applied to the blocking element 17, and since the input 19 is still applied, an output is applied to the input 20 of the AND element, which is now linked to the output 16 of the storage element 13 in the AND element 24 so that an output signal is present at its output 26. The output signal 26 of the AND element is then applied to the control valves 30 and 31, whereby the ventilation valve 30 is closed and the vacuum or negative pressure valve 31 is opened. In this way is then the vacuum on or _e of the negative pressure at the vacuum or Unterdruokbehälter of Pannevis Mlters.

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When the pistons have moved far enough that the outlet 11 communicates with the environment or is ventilated, the input to the storage element is not changed and the storage output remains switched on; ie _e the piston in the cylinder is pushed further (ie “pushed ^{to the left in I 1} Ig ₀ 1) o The input 19 on the blocking member 17 is switched off, and since the input 18 is also switched off, it is on the blocking member 17 no output signal. As a result, the output signal from the AND element 24 is switched off, and the control valves 30 and 31 return to the position in which "air is missing", ie the ventilation valve is open and the vacuum baw "vacuum valve is closed; to this The negative pressure or vacuum is then removed from the negative pressure or vacuum container of the Pannevis filter.If the piston has moved all the way to the left in Fig. 1, the outlet 12 communicates with the environment or is ventilated 22 on the invert he-G-lied is then turned off, and at its output 23 is an off path signal to _e the output signal 23 is applied to the memory element 13, whose output 16 is then turned off. the cylinder relay 27 is then switched, and Air under high pressure is then supplied via the outlet 32, so that the piston in the cylinder 1 is pushed back (that is to say is ^{moved to the right in I 1} Ig, 1).

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The input 19 on the locking member 17 is still switched off, and there is therefore no input to the And-Giied 24. Additionally the output 16 of the memory element 13 is switched off and thus also the input 25 to the AND element 24o The control valves 30 and 31 therefore remain in a position in which air missing, i.e. the ventilation valve is open and the negative pressure vacuum valve closed.

Because of the supply of air under high pressure via the outlet 32, the piston 2 is displaced in the direction of the position in which he is completely moved in or * withdrawn. The input 22 on the blocking element 21 is now switched on, and its output 23 is consequently switched off. The output 26 on the storage member 13 remains switched off and the piston is pushed further into the cylinder.

When the pistons are pushed further into cylinders 2 and 5, input 19 is reapplied to blocking element 17, and if there is no blocking signal, an output signal 20 is applied to this gil that is applied to AND element 24 , the second and the input 25 of the memory 13, however, is still switched off and therefore there is no output signal at the aND gate 24 at _o the control valves 3NC and 31 therefore remain capable of lack in which air, that the ventilation valve is open and the vacuum or vacuum valve is closed.

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This state continues until the memory output 16 is restored, ie ₀ when the piston is in its completely retracted position (ie in Pig. 1 far right). In the meantime, however, an input 18 has been applied to the blocking element 17, so that no output signal 20 is applied to it, and the AND element 24 is ineffective. The valves can therefore not switch until the second outlet is ventilated or connected to the environment is d _o h _o there is no signal at the input of the locking member 18th

The valves can only switch when the piston is pushed out will; the piston is continuously moved from one extreme position to the other until the control air supply is switched off.

In Figo 2 comprises a cylinder 35, a piston and a return spring 37 are provided in the interior of which, at one end an inlet 38 for supply of compressed air, a vent side or _o to the environment open side 39 and outlets 40 to 44 in which in different distances from the inlet 3ό are arranged.

When the Kelten 36 is moved along the cylinder, the outlets 40 to 44 are in turn acted upon by the full operating pressure of the compressed air in the cylinder. Of the Pressure can be determined and felt at each outlet

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and the various pressure combinations can of the piston are used to display the position and direction of movement "If the piston returns under the action" of the spring to its initial position, the outlets are sequentially connected with the aerated or _o open towards the ambient side of the piston.

- Patent claims -

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Claims (1)

Patent claims: 1J control unit for a reciprocating device, which is driven by a piston reciprocating in a cylinder through a cylinder with a piston, an inlet for admission of pressurized fluid at one end of the cylinder, the other end of which is ventilated or open to the environment, and at least four, in different Distances from the inlet for the pressurized fluid, the two outer and the two inner outlets by means of a fluid logic circuit are coupled in pairs such that when pressure is applied to the furthest from the inlet distant outlet, the piston is caused to move towards the inlet, while when no pressure is applied adjacent the outlet closest to the inlet, causing the piston to move away from the inlet, and wherein the inner pair of outlets is arranged so that an operation of the device is affected when pressure is only applied to the there is an outlet closer to the inlet. 2. Control unit according to claim 1, characterized in that it comprises a cylinder, which the pressurized Fluid is supplied to the piston crown side, and that the outlets at different points along the longitudinal extension of the cylinder are arranged. 409811/0480 - 15 - 7 34 3848 5β control unit according to claim 1, characterized in that it has two cylinders, which by means of a cylinder holding device and fixed to the piston rod ends are interconnected so that the piston rods move together when the main drive alternately each fed to the ends of the piston of the first cylinder and that outlets are located at different locations along the length of the second cylinder. 4. Control unit according to claim 3 »characterized in that the second cylinder has a smaller bore than the first cylinder. 5ο control unit according to one of claims 3 or 4, characterized characterized in that at least one additional cylinder is filled with a hydraulic flux to act as a control cylinder works. 6β control unit according to one of the preceding claims, characterized in that four outlets are provided on the cylinder 7. Control unit according to one of the preceding claims, characterized in that the outlets with the fluid logic circuit are connected by means of pipelines. 409811/0480 - 16 - 7343848 ■ J. Control unit »iac: ¹ . ■ im-m 3er previous ti; Ansjjrüche, generally characterized by, da, 3 -aas pressurized fluiu .. ■ vuc ^ air is, ^; ;. _e öteuf re: nhr-it moi. one: ner claims 3 than 5, thereby, .ei; - ■ redraws, that for the "control ias uiiter Lruck put Γ1 ii'.i an .tei. kolDtuEtan ^^ ritnae deü α ie Auuläsye aafv / eiseiidcn"; ·. Mn ; i i'i;., u.re introduces ict. 10. filter: .iit einf-r tax-j unit according to one of the preceding claims, characterized in that aai o .: a bich moving? 'Ii'dei'bano has, under' ./elchein a. i?: i nin- and herbc-v.-egen.aer vacuum b ;;. v "" Interir back boxes or containers are arranged, aer is connected to the control unit eo that α ie 3 · - \. ' -. ^ ung df-ε box oi> r Beiiältf-r.- with the xsewe - ,. un,: en the dteuereiniicit iöt synchronized. 11. oteucreimieit, as essentially referred to herein is described on aie accompanying drawing. 40981 1/0480 ^eAD