DE102017118683A1 - Bobbin-producing textile machine - Google Patents

Abstract

The invention relates to a package-forming textile machine with control valves 1, wherein the control valves 1 each comprise a valve body 2, a piston 3 and a plunger 4, wherein the plunger 4 has a front sealing seat 5 and a rear sealing seat 6 and seals 9, by means of which passages such as a main line 14, a pilot control line 19, a connection 16 and at least one vent 15, in which valve body 2 are alternately sealable and the piston 3 has a piston seal 8 which separates two air circuits. According to the invention, stop surfaces 11 are formed in the valve body. to which the corresponding surfaces 12 of the front and rear sealing seat 5, 6 of the plunger 4 can be brought to bear.

Description

The invention relates to a package forming textile machine with control valves.

On winding machines producing textile machines, such as twisting and cabling machines, it is common that sensor devices are in use, monitor the various operating or process conditions. In this case, for example, pneumatic, electropneumatic or electromagnetic sensor devices are known. Derived from the signals of the sensor devices are driven devices that initiate, for example, a Spulenabhebung, a thread clamping, a thread cut or a spindle stop.

It is also known that between the sensor device and the device to be controlled, a so-called pilot valve can be arranged, which in turn is designed, for example mechanically as a tactile valve or pneumatic actuation valve.

During the twisting process, for example, the presence of the thread is monitored by a mechanical element applied to the thread. When a thread breaks the mechanical element falls due to its own weight around a rotation axis and thereby actuates the switching pin of a pilot valve. The pilot valve is connected to a control valve, which controls a pneumatic actuator, in this example, the coil lift.

The control valves, which are previously used in the packages forming textile machine, have a so-called membrane sealing ball design. That is, a sealing ball is connected via a plunger with a membrane. The membrane is located between a front and a rear chamber. Air flows into the rear chamber via a main line and possibly a fixed throttle. As a result, the diaphragm deforms forward and the plunger with the attached sealing ball closes the front sealing seat in the valve housing. Thus, no air can flow into a pneumatic cylinder connected to the front chamber and via a vent, the pneumatic cylinder can move into its operating position.

For example, in the event of a yarn break, a main pipe located at the rear chamber is opened and the pressure in the rear chamber drops as more air flows out than can flow in via the fixed throttle. Thus, the membrane moves together with the plunger to the rear, the front sealing seat of the sealing ball opens, releases the path of the main air to the pneumatic cylinder and the sealing ball moves against the rear sealing seat, which then the access to the vent hole is closed.

After repairing the thread breakage and restarting the job, the pilot control line arranged at the rear chamber is closed again and pressure builds up again behind the membrane. The control valve returns to the operating position already described.

The membrane with the plunger and the sealing ball mounted thereon, however, is a complex manufacturing component in which it is difficult to comply with the required tolerances. There is thus the danger that during operation an undefined state of suspension occurs, which manifests itself in fluttering of the membrane. The sealing ball is thus not defined at the respective sealing seat and it comes to permanent leakage through the vent hole. In addition, the sealing ball is periodically loaded thereby.

Furthermore, in the operating condition of the full operating pressure permanently from the rear of the membrane, resulting in this flexible and sensitive component for a long time poses the risk of plastic deformation, which in turn can be cause of premature failure of the control valve and thus to a standstill of the job or the Textile machine lead.

One aspect of the present invention therefore relates to a spool forming textile machine with control valves, the control valves each comprising a valve body, a piston and a plunger, the plunger having a front sealing seat and a rear sealing seat and seals, by means of which passages, such as a main line, a pilot control line, a connection and at least one vent, in the valve body are alternately sealable and the piston has a piston seal, which separates two air circuits from each other.

The casserole-producing textile machine is characterized in that in the valve body stop surfaces are formed, to which the corresponding surfaces of the front and rear sealing seat of the plunger can be brought into abutment.

In this way, the path of the plunger or the respective seal is limited in the sealing surface. Due to the defined deformation limitation of the seals, the maximum deformation of the seals can be specified and the seals can not slip too far into the sealing gap. This ensures a long life of the seals.

By such a design of the textile machine, the control valves can be made pragmatic and inexpensive. Due to the formation of stop surfaces with corresponding surfaces, in particular material influences are no longer so significant and disturbing for the functionality, as is the case with the membrane sealing ball design.

In addition, this type of sealing seat is sufficiently durable for the expected number of cycles on a casserole producing textile machine.

Since the maximum piston stroke is designed as a short-stroke piston with two conical sealing seats, a compact design of the control valve is maintained, the piston stroke can advantageously be designed wiping 0.8 mm and 5 mm.

Finally, by the use of such control valves in a casserole-producing textile machine, a cost-effective and compact textile machine can be offered, without having to be compromised by malfunction of the control valve quality losses in the production of packages casseroles. By means of a take-up spool, for example, not lifted off the drive roller after a yarn break, it remains on the drive roller and is permanently driven on a diameter, which can lead to yarn damage. Also, no increased maintenance or increased need for repair is to be expected by such a configuration.

In a preferred embodiment of the invention, the surfaces corresponding to the seals are designed to be tapered.

In the case of a conical sealing seat, the advantage is that the seal is fixed in a groove and is only compressed or relieved without any frictional stress on the sealing surface. For seals directly to a cylindrical plunger, the seal would be rubbing or shearing claimed during movement of the plunger. In the case of an axial seal, however, the seal could adhere to the sealing surface because it can not be grasped in a groove.

In a further preferred embodiment, the piston and the plunger are formed in two pieces.

Such a design ensures a simpler installation of the control valve. The connection of the two parts is fixed and can be done by a thread. Alternatively, the two parts can also be connected via press fit or as an adhesive bond. Basically, all joining techniques are conceivable within the scope of the invention, which allow a stable connection of the piston with the plunger.

In particular, a support element is provided, which is arranged so that the piston is secured to the plunger and the piston seal can be fixed to the piston.

If the piston is produced without a groove, since the support element fixes the piston seal, the assembly of the piston seal is simplified. The piston seal is applied to the piston and fixed by the support element to this, while previously the installation had to be carried out very carefully to ensure the functionality. The attachment of the piston seal on the piston can now also be done without tools and the risk that the sealing surface of the piston is damaged is eliminated. In addition, the support element ensures a constant secure seat of the piston seal on the piston even during use in the textile machine.

At the same time the support member secures the piston on the plunger, so that during the entire life of a defined seat of the piston on the plunger and, consequently, a proper function of the control valve is made possible.

A plastic injection molding based production of the essential components is, as before, possible. This also applies to the piston and plunger. Previously, in order to achieve a secure sealing effect, a rework had to be carried out by over-rotation for a piston with a groove for the piston seal, as exactly in the sealing surface of the piston, the mold separation of the tool. The injection molding tool for a piston without a groove can be designed so that in the region of the sealing surface no mold separation and a cutting rework is therefore eliminated. The additional expenditure and the associated additional costs are eliminated by such a design.

In a preferred embodiment, a connection designed as a constriction between the main line and the pilot line is integrated in the plunger.

By such a bottleneck, which is formed as an axial bore in the plunger, the air from the main line to the rear chamber and the pilot line can flow.

Alternatively, the bottleneck is formed in the plunger by a separate fixed throttle.

It is within the scope of the invention possible to attach a fixed throttle in the plunger. This can preferably in the plunger bore be present, in which a separate fixed throttle is inserted.

In particular, the seals are designed as O-rings.

O-rings are inexpensive and available as standard products.

Preferably, the support member is non-destructively releasably attachable to the plunger.

The support member can be pushed from the side into the groove, for example after placing the piston equipped with the piston seal on the plunger and a groove formed in the plunger as a lock washer from the side into the groove and snaps there. As a result, not only the assembly of the piston seal is simplified as already described, but also the disassembly. An exchange of the piston seal is thus possible without tools, without the risk that the sealing surface of the piston is damaged when removing the piston seal.

Advantageously, the control valve is designed as a single or multiple unit.

The control valve can be constructed either in a single version or as a multiple version, for example as a double version. Depending on the application, the control valve may be designed as needed within the scope of the invention. In this case, two positions or workstations are controlled by a control valve, which is designed as a double version, on the textile machine. A multiple or double design is essentially cheaper to manufacture.

Further features and advantages of the invention will become apparent from the following description of preferred embodiments of the invention, with reference to the figures and drawings showing essential to the invention details, and from the claims. The individual features may be implemented individually for themselves or for several in any combination in a preferred embodiment of the invention.

Preferred embodiments of the invention are explained below with reference to the accompanying drawings.

• 1 eine schematisch dargestelltes Steuerventil mit geschlossenem vorderen Ventilsitz;
• 2 eine schematisch dargestelltes Steuerventil mit geschlossenem hinterem Ventilsitz;
• 3 ein schematisch dargestelltes Ausführungsbeispiel eines erfindungsgemäßen Stützelementes;
• 4 schematisch einen Teil des Stößels mit dem daran angeordneten Kolben und Stützelement.

Show it:

• 1 a schematically illustrated control valve with a closed front valve seat;
• 2 a schematically illustrated control valve with closed rear valve seat;
• 3 a schematically illustrated embodiment of a support element according to the invention;
• 4 schematically a part of the plunger with the piston and support member disposed thereon.

In the 1 is an example and in a schematic view of the structure of a control valve 1 with closed front sealing seat 5 shown.

The control valve 1 includes a valve body 2 and a piston 3 and a pestle 4 , Below the piston 3 separates a piston seal 8th the two air circuits respectively the front chamber 17 and the rear chamber 18 ,

Again below the piston seal 8th is a support element 10 arranged. Through the support element 10 not just the piston 3 on the pestle 4 secured, but also the piston seal 8th on the piston 3 fixed.

Furthermore, the valve body has 2 , in this embodiment, three-part, on stop surfaces 11 , to the respective corresponding surfaces 12 attached to the front and rear sealing seats 5 . 6 of the plunger 4 are formed, can be brought to the plant.

About the main line 14 Air flows through a small bore through the axle through the plunger 4 in the rear chamber 18 , The axial bore or the small diameter is fluidically designed so that a throttle function is given. This pushes the piston 3 due to the large rear effective area in the front layer and seals by means of a seal 9 , formed in this embodiment as an O-ring, on the conical front sealing seat 5 from.

It is at the stop surfaces 11 in the valve body, the corresponding surfaces 12 of the front sealing seat 5 brought to rest, leaving the O-ring of the front seal seat 5 undergoes a defined maximum deformation and can not be squeezed into the sealing seat.

This will prevent air from entering the port 16 , to which, for example, a single-acting pneumatic cylinder is connected, flow and a vent 15 the pneumatic cylinder can move to its operating position.

2 shows the control valve 1 with closed rear seat 6 , Unlike in the 1 is in this embodiment in the ram 4 a hard thrush 13 attached, through which the air into the rear chamber 18 flows.

In the case of a thread break, for example, the control valve 1 be switched. Via a (not shown) pilot valve is the pilot control line 19 at the control valve 1 released, that is opened. The pressure in the back chamber 18 falls off, because more air flows out than over the fixed throttle 13 in the pestle 4 can flow, so the piston moves 3 to the rear, the tapered front sealing seat 5 opens, gives the way of the main air through the front chamber 17 to the connection 16 to the pneumatic cylinder free and the piston 3 moves against the also conical rear sealing seat 6 , giving access to the vent 15 is closed.

This is then to the stop surfaces 11 in the valve body 2 the corresponding areas 12 the rear sealing seat 6 brought to rest, leaving the O-ring of the rear sealing seat 6 also experiences only a defined maximum deformation and can not slip into the sealing seat.

After removing the thread break and restarting the twisting point, the pilot control line 19 closed again. Pressure builds up again as described above in the back chamber 18 on and the piston 3 goes again as described above in the front operating position.

3 shows an example of a support element according to the invention 10 , The support element 10 is here designed as a clamp, which in a corresponding groove 7 of the plunger 4 slidable. In this way, the piston seal 8th light and without tools on the piston 3 be attached. Thereby, that the support element 10 back out of the groove 7 of the plunger 4 is an exchange or renewal of the piston seal 8th possible. In addition, by the support element 10 The piston 3 on the plunger 4 secured.

4 schematically shows a part of the plunger 4 with the piston arranged thereon 3 , Below the piston 3 is the piston seal 8th arranged. In a groove 7 in the pestle 4 is present, is the support element 10 locked, whereby on the one hand a proper seat of the piston 3 on the plunger 4 guaranteed and on the other hand, the piston seal 8th on the piston 3 is attached.

LIST OF REFERENCE NUMBERS

1

control valve

2

valve body

3

piston

4

tappet

5

Front sealing seat

6

Rear seal seat

7

groove

8th

piston seal

9

poetry

10

support element

11

stop surface

12

Corresponding surface

13

fixed throttle

14

main

15

vent

16

Connection pneumatic cylinder

17

Front chamber

18

Rear chamber

19

pilot line

Claims (9)

A package-forming textile machine with control valves (1), the control valves (1) each comprising a valve body (2), a piston (3) and a plunger (4), the plunger (4) having a front sealing seat (5) and a rear one Sealing seat (6) and seals (9), by means of which passages, such as a main line (14), a pilot line (19), a connection (16) and at least one vent (15), in the valve body (2) are alternately sealable and the piston (3) has a piston seal (8) which separates two air circuits, characterized in that stop surfaces (11) are formed in the valve body (2), to which the corresponding surfaces (12) of the front and rear sealing seat ( 5, 6) of the plunger (4) can be brought to bear. Bobbin-producing textile machine according to Claim 1 , characterized in that the to the seals (9) corresponding surfaces (12) are designed conical. Bobbin-producing textile machine according to Claim 1 , characterized in that the piston (3) and the plunger (4) are formed in two pieces. Bobbin-producing textile machine according to Claim 1 , characterized in that a support element (10) is provided, which is arranged so that the piston (3) on the plunger (4) secured and the piston seal (8) on the piston (3) is fixable. Bobbin-producing textile machine according to Claim 1 , characterized in that in the plunger (4) designed as a bottleneck Connection between main line (14) and pilot line (19) is integrated. Bobbin-producing textile machine according to Claim 5 , characterized in that the constriction in the plunger (4) by a separate fixed throttle (13) is formed. Bobbin-producing textile machine according to Claim 1 , characterized in that the seals (9) are formed as O-rings. Bobbin-producing textile machine according to Claim 1 , characterized in that the support element (10) is non-destructively releasably attachable to the plunger (4). Bobbin-producing textile machine according to Claim 1 , characterized in that the control valve (1) is designed as a single or multiple unit.

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