EP1837426A2 - Device to monitor a belt guide - Google Patents

Abstract

The device for monitoring of a lateral guidance of a circulating, continuous belt (R), which is led for the formation of a cotton reel (WW), over deflection pulleys in a loop around a core (H), comprises a press-contact element (12), a deflection spring (22) and a distance sensor (44) for detecting the movement of the element, which is movably mounted over the spring towards a lateral edge of the belt. The core is held between two winding discs (W1, W2) that radially protrude from the core. The sensor is connected with a control unit and is accommodated within a casing. The device for monitoring of a lateral guidance of a circulating, continuous belt (R), which is led for the formation of a cotton reel (WW), over deflection pulleys in a loop around a core (H), comprises a press-contact element (12), a deflection spring (22) and a distance sensor (44) for detecting the movement of the element, which is movably mounted over the spring towards a lateral edge of the belt. The core is held between two winding discs (W1, W2) that radially protrude from the core. The sensor is connected with a control unit and is accommodated within a casing. The element and the spring are surrounded partly with the casing. A press-tip of the element provided with a contact surface protrudes from an opening of the casing in the direction of the lateral edge. The spring is connected with the casing at one of its ends and is attached to the element at the other end. The sensor lies between the attachment of the spring and the element at a distance facing the spring. A dead stop is intended, which limits the movement of the element towards the belt caused by the spring effect. The contact surface is formed from a wear-resistant coating and is annealed or hardened. The press-tip is connected with a machine frame by an electrically conductive line. The casing is adjustably fastened transverse to the belt direction. The distance between the casing and the edge of the belt is greater than the distance between the winding disk arranged at the same side of the belt, and the edge of the belt, when seen across the direction of movement of the belt. The casing is provided with two further openings, which are attached to the oppositely-lying sides of the casing. The control unit is connected with adjusting mechanisms for influencing the direction of movement of the belt. The control unit is provided with a special program, which serves for the evaluation of the signals delivered continuously or intermittently by the sensor and for the initiation of appropriate measures or control commands.

Description

The invention relates to a device for monitoring the side guide of a revolving, endless belt, which is guided to form a lap roll in a loop around a core over a plurality of pulleys, wherein the core is held between two, the core in the radial direction superior winding discs.

In the WO 2005/038100 A1 Such a winding device for producing wadding has been shown and described. In this case, the lap roll is formed by means of an endlessly circulating belt, which is guided over a plurality of deflection rollers and forms a loop around a core, or a sleeve, on which the lap web is wound up. In this publication has already been described that it can lead to problems in terms of the life of the belt, and also to loss of quality of the wound lap to be formed, if the belt shifts laterally outside the range of tolerance during the processing process. In order to guide the belt into the loop area, in particular in the region in front of the inlet, or to correct a lateral drift, various devices have been proposed in WO'1 00. This z. B. rolls proposed, which are provided with guide discs, which are arranged in the edge region of the belt for lateral guidance. In addition, sensors may be provided in the area of the guide disks, which monitor the lateral movement of the belt. These guide means are sometimes very complex and require a precise adjustment. In addition, they must be regularly maintained. Furthermore, in the cited publication, a device is shown, wherein in the edge regions of the belt in each case at a predetermined distance rotatable rollers are arranged. As soon as the belt deviates to one side or the other from a predetermined tolerance range, the respective roller is set in rotary motion, which comes into contact with the belt edge. This rotational movement is detected by a sensor which outputs the generated signals to a control unit. The control unit then initiates appropriate measures. One of the measures can z. B. include the shutdown of the machine. Another measure is that sent via the control unit control commands intended actuators which are capable of returning the belt to its desired position. Although the attachment of such rollers for scanning the belt edge includes an exact monitoring possibility of the lateral belt guide, but is subject to a certain wear and also susceptible to contamination, especially with regard to the fiber fly.

In addition, the arrangement described only reacts when the belt has already moved out of its tolerance range.

In the publish JP-2003-20142A a winding device is also shown with a revolving endless belt, wherein the lateral belt guide each two rotatably mounted rollers are proposed, which are fastened laterally deliverable with respect to the belt edge. These rollers, which hang up with their circumference on the edge of the belt during the working process, have only the task of a guide and no monitoring function. The roles are subject to wear and can be affected in particular by fiber fly in their function.

Furthermore, from the literature "Leichttransprot-Bandtechnik-2nd edition K. Koster-volcano Verlag Essen" under Figure 42 several different monitoring sensors for monitoring the lateral belt running proposed. On the one hand, optical sensors, pneumatic sensors and also mechanical feeler elements are proposed. The designs shown here are susceptible to contamination, which may affect their function. In particular, the non-contact sensors (air, light) shown here can provide false signals as soon as fibers have settled in the edge region of the belt to be scanned. The mechanical button shown in Figure 42 is also susceptible to contamination and can wear very quickly at high belt speeds and high lateral forces of the belt.

The invention is therefore based on the object to provide a device for monitoring the lateral belt guide, which has the disadvantages of known performances eliminated and wear-resistant and insensitive to contamination is formed.
To solve the problem, a device for monitoring the lateral guidance of the belt is proposed, wherein the device is formed from a sensing element which is movably mounted via a spring element in the direction of a side edge of the belt, wherein a, the movement of the probe element detecting sensor is provided which is connected to a control unit, and the probe element and spring element are at least partially surrounded by a casing, wherein the provided with a tactile probe of the probe element protrudes from an opening of the shuttering in the direction of the side edge of the belt.

With this device it is ensured that in each case only the probe protrudes with the sensing surface of the probe element in the region of the belt edge. Thus, the remaining area, which provides for the mobility of the probe element, substantially encapsulated with respect to the resulting fiber fly, whereby its functionality is maintained. In this embodiment, it is provided that the probe surface of the probe continuously rests on the side edge of the belt, at least while the belt is within a tolerance range provided. The investment of the touch surface on the belt edge is determined by the structural design of the possible mobility of the probe element.

Preferably, it is proposed that the sensor which detects the movement of the feeler element is likewise accommodated within the shuttering and thus also protected against damage and soiling.

Preferably, the spring element is formed from a spiral spring, which is connected at one end to the casing and wherein on the other end of the probe element is attached.

The sensor for detecting the movement of the probe element may be formed as a distance sensor, which is opposite to the attachment of the bending spring and the probe element at a distance of the spiral spring.

Thus, the probe element rests with a certain bearing force on the edge of the belt during operation, the attachment of an end stop is provided which limits the movement of the probe element generated by the spring action in the direction of the belt. D. h., When the probe element is seated on the stop, it is still under a bias by the spring element.

To increase the stability of the probe element is further proposed that at least the sensing surface of the probe consists of a wear-resistant material. It is also possible that the entire probe element can be formed uniformly from a wear-resistant material.

To increase the wear resistance, an embodiment is possible, wherein at least the tactile surface of the probe is tempered or hardened.

It would also be conceivable that at least the tactile surface of the probe is provided with a wear-resistant coating.

In order to avoid a static electrical charge of the belt edge, it is proposed that the probe is electrically connected to the machine frame.

To compensate for tolerances and for setting purposes, it is proposed that the casing is mounted adjustable transversely to the direction of belt travel. This makes it possible to adjust the position of the probe element with respect to the course of the side edge of the belt exactly.

Furthermore, it is proposed that, viewed transversely to the belt running direction of the belt, the distance between the casing to the belt edge is greater than the distance between the winding disk arranged on the same side of the belt and the belt edge. This ensures that at a lateral drift of the belt, the belt edge first impinges on the inside of a winding disk and is guided there, whereby the shuttering of a stress through the belt edge is spared for the time being. Only when the belt, z. B. by dodging the belt edge in the winding disk, further moves laterally, it may come to a contact between the edge of the belt and the casing. The casing provides a protective jacket for the attachment of the probe element, and protects them from damage by the belt. Conversely, the belt is protected from the fasteners. By means of a corresponding control program, it can of course be provided that, based on the signals transmitted by the sensor of the probe element, the machine is shut down beforehand before the belt edge touches the shuttering.

During operation, it may happen that, despite the planned casing contamination through the opening of the casing, from which protrudes the probe, in the region of the spring element, or the sensor. However, such contamination can lead to possible damage to the device only at greater intervals. In order to eliminate this possible contamination is proposed that the casing in addition to the opening, from which protrudes the probe of the probe element, is provided with at least two further openings, which are respectively mounted on opposite sides of the casing. Through these additional openings, the area within the casing can be cleaned of any deposits by using a compressed air device. It is conceivable to close the additional openings during operation with corresponding covers in order to avoid dust ingress.

It is preferably proposed that the control unit, which receives signals via the belt path via the sensor, is connected to adjusting means for influencing the direction of belt travel. Such adjusting agents are in the already cited WO 2005/038100 A1 already shown and described.

To implement the signals continuously or discontinuously supplied by the sensor to initiate appropriate measures or to transmit control commands, it is proposed to provide the control unit with a special program.

Further advantages of the invention will be shown and described in more detail with reference to subsequent embodiments.

Fig.1

eine schematische Seitenansicht einer Wickelvorrichtung eines Riemenwicklers

Fig. 1a

eine verkleinerte Schnittdarstellung A-A nach Fig. 1.

Fig. 2

eine schematische Seitenansicht des erfindungsgemäss beanspruchten Tastelementes mit einer Verschalung

Fig. 3

eine weitere Ansicht des Tastelementes nach Figur 2

Fig. 4

eine schematische Ansicht einer verstellbaren Rolle nach Fig.1

Show it:

Fig.1

a schematic side view of a winding device of a belt winder

Fig. 1a

a reduced sectional view AA of FIG. 1.

Fig. 2

a schematic side view of the invention claimed sensing element with a casing

Fig. 3

a further view of the probe element of Figure 2

Fig. 4

a schematic view of an adjustable roller according to Fig.1

Fig. 1 shows a winding device 1, which already in the already pre-published EP-A1-929 705 has been shown in similar form and described in detail. Therefore, the operation of this winding device is described only superficially in the following description. In the winding device 1 shown, a lap roll WW is produced by means of a belt R. The belt R is guided over firmly mounted or pivotable rollers R1-R6, wherein it forms a loop S between the rollers R1 and R2 about a fixed axis of rotation AX. To produce a lap roll WW, a cotton wool W is fed into the loop S on the circumference of a sleeve H via the calender rolls K1 to K4 between the two rolls R1 and R2. The sleeve H is clamped between two winding disks W1, W2 shown in FIG. 1a during the winding process. In this case, a distance a between the winding disks W1, W2 and the belt is provided so that the belt edge Rs is not worn during the winding process. As the winding WW becomes larger, the loop S comprising the winding increases in size until the winding has reached a desired diameter. Reaching the desired winding diameter is determined either directly by corresponding sensors on the circumference of the roll or indirectly by scanning the supplied cotton wool length. During the winding process, the belt displacement, or the control of the belt tensioning force is performed via a tensioning device 3, which is controlled by a cylinder Z. is moved. By the tensioning device 3, a tension roller R6 is pivoted about an axis 4. During the winding process, the lap roll WW rotates in the direction of rotation D. Shortly before the end of the winding process, the drive of the calender rolls K1-K4 is stopped, while the drive for the rotation of the lap roll WW via the belt R is still in operation. As a result, the cotton wool in the region of the guide plate 6 is separated. Once the separation process is completed, the drive of the winding device 1 is stopped. About the arm 8, which is pivotable about the axis AX. the roller R2 is pivoted downward, whereby the roller R3 pivots about the arm 9 down. With the aid of the tensioning device 3, the belt R is further tensioned and the ejection of the finished lap roll WW carried out on a recording, not shown. After the ejection operation, a new winding process is started after swiveling back the rollers R2, R3 into their position shown in FIG. 1 and after introduction of a new sleeve H. For this purpose, the calender rolls K1-K4 are set in motion again by a drive not shown in detail. At the same time by a drive, not shown, one of the rollers R1-R6 of the belt R and thus the winding device is set in motion, so that a new winding can be formed.

As long as the calender rolls K1-K4 a cotton wool W is continuously fed via a guide 11, the process described the winding formation can be carried out continuously. However, an interruption in the supply of cotton wool, z. B. in an outgoing material template or a change in the fiber material to be processed, then it is necessary to thread a new end of a cotton wool between the calender rolls K1-K4. Before feeding the new cotton wool, the cotton roll WW still in the loop S should be ejected and the winding device prepared for the formation of a new cotton wool wrap.

In order that the distance a shown in FIG. 1 a to the two winding disks W 1, W 2 can be maintained, or the course of the belt can be monitored, a monitoring means 10 is arranged in the region in front of the roller R 1, which is shown in FIGS. 2 and 3 is shown in an enlarged view.

Thus, the belt edge Rs is not worn by friction on the winding disks W1, W2, it is necessary to maintain a minimum distance a to these winding disks. Depending on the tolerances in the bearings of the rollers R1-R6 and depending on the heating of the belt R, it may happen that the belt R drifts to one side or the other during the winding process. He can thus reach from a predetermined tolerance range, whereby the belt edge can come to rest on one of the winding disks. If the resulting friction between the belt and the respective winding disk is maintained, it can lead to fraying in the belt edge Rs. There is a risk that these fraying (eg projecting ends of strings of a fabric layer of the belt) causes fibers to be released from the edge region of the roll WW, which results in an unclean roll. This in turn has negative effects in subsequent processing on the comber, which quality losses must be accepted. In addition, it can cause distortions in the belt edge area, whereby windings are formed with uneven edge areas.
In addition to the impairment of the production of a high-quality roll WW, the belt is subjected in its peripheral regions during lateral emergence on the winding discs wear by the resulting friction, whereby its life is reduced.

In order to prevent such quality losses, it is necessary to monitor the belt travel with respect to a lateral displacement. It is important that a monitoring device used in this case is designed such that it remains fully functional despite existing fiber fly, and on the belt deposited components (such as fibers and other impurities) over the entire winding process.

1, a monitoring device 10 is shown schematically, which is mounted in relation to the drive direction AR of the belt R in front of the deflection roller R1 in the machine frame. As can be seen in particular from the enlarged view X of FIG. 2, the monitoring device consists of a feeler element 12, which is provided with a probe 13, which is provided with a touch surface 14. Of the Probe 13 protrudes from an opening 18 of a casing 16 and lies with a pressing force F with its touch surface 14 on the belt edge Rs of the belt guided by past R. The pressing force F is relatively small, but ensures that the sensing surface 14 of the probe element is held securely and continuously in contact with the belt edge Rs, as long as it is in the range of movement of the probe 13.

The position shown in Fig. 2 is present when the belt R moves with respect to its side guide within an allowable tolerance range.
In order to generate the described pressure force F on the passing belt edge Rs, the probe element at the opposite end of its touch surface 14 on a spring bar 22 (also called leaf spring) is attached. The spring bar 22 is attached at its other end 23 via screws 24 to a holder 25. The holder 25 is mounted on the inside of the rear wall 38 on the casing 16.
The geometry of the spring bar 22 is designed so that the spring bar is in the position shown under a bias and generates a force F in the direction of the passing belt edge Rs.
When the belt shifts laterally to the right in relation to its drive direction AR, the feeler element 12 will also follow this lateral movement under the action of the spring rod 22, or through the force F generated thereby, until a stop 41 mounted on the spring rod engages Inside the front wall 37 of the casing 16 is seated. In this case, the stop 41 sets back a distance b which corresponds to the lateral displacement b1 of the belt R. Even in this end position, in which the stop 41 is seated on the inside of the front wall 37 is still a small biasing force of the spring rod 22 is present. This ensures that with a shift back of the belt R in the direction of the monitoring device 10, the probe element 12 always rests under a pressing force F on the belt edge Rs as soon as the belt edge comes again on the touch surface 14 to the plant.
In order to avoid a static electrical charge (by friction between the belt R and the touch surface 13) of the belt edge Rs, or to dissipate electrostatic charges, the probe 13 is electrically connected via line 60 to the machine frame MG.

In order to counteract a lateral drifting of the belt, it can be provided (not shown) that at least one roller R1 to R6 or the roller 12 is provided with a crowning (lateral surface is provided with an outwardly curved radius). Such an embodiment is z. B. in the CH 694 559 already described.
To detect the lateral belt displacement, the movement of the spring bar 22 is detected, to which the probe element 12 is attached. In this case, a distance sensor 44 is provided, which is attached at a distance c to the spring rod 22 on the rear wall 38 of the casing 16. As soon as the belt edge Rs shifts laterally, the feeler element 12 also shifts, as a result of which the distance c changes. This change is transmitted via the sensor 44 via a line 21 to a control unit ST. The control unit ST is equipped with a program PR, via which the signals of the sensor 44 is evaluated and, if necessary, corresponding control signals for the drive AN or an adjusting means 46 for influencing the belt guide are generated. The control unit is connected to the line 23 to the drive AN and via the line 24 to the actuating means 46.
Moves z. B. the belt over a certain time interval outside a predetermined tolerance range, then via the control unit on the basis of the program PR a control signal to the drive ON the machine transmitted, which stops the drive of the machine and simultaneously generates a corresponding warning signal (optical, acoustic) to indicate to an operator that the machine is out of service and appropriate action must be taken.
However, before it comes to an undesirable belt position, it is possible through the use of appropriate means to return the belt back into a predetermined tolerance range. In this case, the control unit ST is connected to a schematically indicated actuating means 46 via the line 24, via which suitable measures for returning the belt are initiated. Only when these measures are unsuccessful, the entire machine is shut down.
In Fig. 4 (see also Fig.1), an example of such an actuating means is shown in more detail. Via the line 21, the sensor 44 of the monitoring device 10 is connected to a control unit ST, in which the signals emitted by the sensor 44 are processed. The control unit ST is connected via a path 23 to the drive AN of the winding device 1 connected. Via a further path 24, the control unit ST controls a valve 26, via which the connection is made by a pump 28 to a cylinder Z1, or interrupted. The sectional view of the roller R5 in FIG. 4 corresponds to a view U according to FIG. 1.

The cylinder Z1 is connected to a receptacle 31 in which an axle 30 is mounted. On the opposite side of the receptacle 31, a further receptacle 32 is provided, which is designed to receive the other end of the axis 30. The receptacle 32 is formed (not shown) that the axis 30 can perform in the receptacle 32 small pivoting movements, which is generated by the displacement of the receptacle 31 via the cylinder Z1. This move option is shown schematically by a double arrow. Due to the inclination of the axis 30 from its original zero position (in a plane which extends approximately parallel to the plane of the belt inlet) also changes the position of the inlet line EL (Figure 1) of the belt R on the roller R5 with respect to the previous transport direction of the belt, which is thus changed. As a result of this change, after a single revolution of the belt, there is also a transverse displacement of the belt R on the roller R5, which is schematically indicated by a double arrow. The roller R5 is rotatably mounted on the axis 30 via the bearing points 34, 35. Of course, the roller R5 is also secured in position in the axial direction. With this device, which z. B. in the WO 2005/038100 will be described in more detail, it is possible to generate a return of the belt in a predetermined tolerance range. If this does not succeed, the already described shutdown of the machine is initiated.

For fixing the monitoring device 10, or its casing 16, a tab 48 is attached to the rear wall 38, which is provided with a slot 50 (Figure 3). Through the slot 50 protrudes a screw 49 which is screwed in a machine frame MG shown schematically. Through the slot 50 is a lateral displacement, which was indicated by a double arrow, the monitoring device 10 with respect to the belt edge Rs possible. Thus, the position of the probe element 12 can be adjusted exactly to the belt run.

As can be seen in particular from FIG. 4, the casing 16 of the monitoring device, or its side wall 37, has a greater distance K from the belt edge Rs than the inner surface 45 of the winding disk W1, which has a distance a when the belt R moved within a tolerance range. That is to say, the surface 45 of the winding disk W1 and the outer surface 40 of the side wall 37 of the casing 16 extend at a parallel distance e, viewed transversely to the direction of belt travel.
This ensures that at a lateral drifting in the direction of the probe element 12 of the belt edge Rs first comes into contact with the winding disk W1 and the monitoring device 10 is not yet acted upon by the belt R. Only with a further lateral displacement of the belt, the casing 16 comes as protection for the attachment of the probe element to the effect.
It can thereby be achieved that under certain circumstances, the belt R is returned by suitable measures in a predetermined tolerance range before it comes into contact with the casing 16 of the probe element 12.

Furthermore, upper cover 39 of the casing 16 is provided with an opening 42 which is closed with a plug 43. On the underside of the casing 16 is open, or provided with an opening 20. This could, if necessary, also be closed with a suitable cover during operation. Since it can not be ruled out that soiling, z. B. fibers can pass through the opening 18 in the region of the probe 13 in the casing, it is necessary to clean the interior of the casing at certain intervals. In this case, the plug 43 is removed and by applying compressed air to the opening 42, these contaminants are removed via the opening 20 from the inner region of the casing 16, or blown out. Of course, if the opening 20 is also provided with a cover, it must also be removed before it is blown out. After this cleaning operation, the cover 43 and, if present, the cover of the opening 20 is replaced.

It is also conceivable to attach to the upper opening 42 a permanently mounted compressed air connection, via which compressed air is blown through the casing 16 at intervals for discontinuous cleaning.
With the proposed monitoring device 10, or with the substantially abgeschotteten probe element 12, to obtain a device which is protected against contamination and represents a low-wear and functional, as well as a cost-effective design. In addition, it is ensured that the belt does not come with a lateral displacement in contact with the attachment of the probe element. As a result, jamming or damage to the belt is prevented by these elements.

Claims (14)

Apparatus for monitoring the lateral guidance of a circulating, endless belt (R), which is guided around a core (H) over a plurality of deflection rollers (R1-R6) in a loop (S) in a loop (S), the core between two , the core is held in the radial direction superior winding disks (W1, W2), characterized in that the device (10) consists of a sensing element (12) which via a spring element (22) in the direction of a side edge (Rs) of the belt ( R) is movably mounted, wherein a, the movement of the probe element (12) detecting sensor (44) is provided which is connected to a control unit (ST), and the probe element (12) and spring element (22) at least partially with a casing (16) are surrounded, wherein the provided with a sensing surface (14) probe (13) of the probe element (12) from an opening (18) of the shuttering (16) in the direction of the side edge (Rs) of the belt (R) protrudes. Apparatus according to claim 1, characterized in that the sensor (44) is also housed within the casing (16) Device according to one of claims 1 to 2, characterized in that the spring element consists of a spiral spring (22) which is connected to one end (17) with the casing (16) and on the other end of the probe element (12) is attached , Apparatus according to claim 3, characterized in that the sensor (44) is designed as a distance sensor and between the attachment of the bending spring (22) and the probe element (12) at a distance (c) facing the bending spring. Apparatus according to claim 1, characterized in that an end stop (41) is provided which limits the movement of the sensing element (12) generated by the spring action in the direction of the belt (R). Device according to one of claims 1 to 4, characterized in that at least the sensing surface (14) of the probe head (13) is formed of a wear-resistant material. Device according to one of claims 1 to 4, characterized in that at least the sensing surface (14) of the probe (13) is tempered or hardened. Device according to one of claims 1 to 4, characterized in that at least the sensing surface (14) of the probe head (13) is provided with a wear-resistant coating. Device according to one of claims 1-4, characterized in that the probe head (13) via an electrically conductive connection (60) to the machine frame (MG) is connected. Device according to one of claims 1 to 2, characterized in that the casing (16) is mounted transversely adjustable to the belt running direction (AR). Device according to one of claims 1 to 10, characterized in that viewed transversely to the belt running direction (AR) of the belt (R), the distance (K) between the casing (16) to the belt edge (Rs) is greater than the distance (a ) between the winding disk (W1) and the belt edge (Rs) arranged on the same side of the belt (R), Device according to one of claims 1 to 2, characterized in that the casing (16) in addition to the opening (18) from which the probe head (13) of the feeler element (12) protrudes with at least two further openings (42, 20) is provided which are each mounted on opposite sides of the casing (16). Apparatus according to claim 1, characterized in that the control unit (ST) with adjusting means (46) for influencing the belt running direction (AR) is connected. Device according to one of claims 1 or 12, characterized in that the control unit (ST) is provided with a special program (PR), which is used to evaluate the continuously or discontinuously supplied by the sensor (44) signals and the initiation of appropriate measures, or trigger control commands.

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