JP2003510473A - Edge sensing device - Google Patents

Abstract

(57) [Summary] The present invention relates to an apparatus related to a wire guide roller of a paper machine. The device includes a wire guide roller (3) arranged to guide the wire (1) when the wire is driven laterally from its normal running track. This wire guide roller is rotated in the direction of travel (A) of the wire by at least one actuator (5). The lateral (B) position of the wire is observed by a guide flap (2) which monitors the movement of the wire edge, from which guide information is transmitted with respect to that part to a control unit (4) which controls the actuator. Is done. Further, at least one sensor is located in association with the guide flap to determine the position of the guide flap and to control the lateral overrun of the wire.

Description

Detailed Description of the Invention

TECHNICAL FIELD The present invention includes a wire guide roller that traverses a wire travel direction, the wire guide roller being arranged to be rotated in the wire travel direction by at least one actuator, and A guide flap disposed relative to the edge and adapted to observe the lateral position of the wire, wherein the wire guide roller is based on information provided by the guide flap on the lateral position of the wire. Apparatus for rotating a wire guide roller of a papermaking machine including means arranged to rotate and guide the papermaking machine, and further including means arranged to inform a controller of the papermaking machine about the lateral position of the wire.

BACKGROUND OF THE INVENTION Various wires are used in paper machines to convey and support fibrous webs. In this regard, a paper machine may also be understood as a cardboard machine, a similar paper making facility with pulp washing equipment and wires. As the wire is passed around and supported by the various rollers of the paper machine, the wire may be driven to either edge in its direction of travel, rubbing the wire edge against the structure of the paper machine. . The wire of course does not resist this kind of force, but it is damaged. The wire itself has a reason to drive it laterally, but this is usually caused by an incorrect position of the roller. Also, impurities attached to the roller and the wire cause the wire to move laterally. To solve the problem, a "wire guide roller" is arranged in connection with the wire circulation which prevents the wire from moving laterally. When the wire is driven laterally, the wire guide rollers are automatically rotated in the desired direction and the wire is guided back into its correct course of travel. The guide rollers receive guide information from guide flaps that continuously monitor the edges of the wire. In addition to guide flaps, paper machines typically sense the lateral position of the wire and provide an alarm to the paper machine controller if the wire is driven too close to the edge for any reason. Has edge flaps on both edges. The prior art solution is described later in FIG. 1 and in the description. However, a disadvantage of the known solution is that the installation of equipment on the paper machine is laborious. Due to the requirements, it is difficult to place several flaps, flap fasteners and cables leading to the flaps in tight places. In addition, maintenance is difficult because the sensors are located on different sides of the paper machine and away from each other. When several block cleaning devices are applied to thin single-layer wires and the known solutions are used, the problem arises that the guide flap bends the thin wire from its edge and the result of the bent edge. As such, the edge flaps provide poor information to the paper machine controller and the operation of the flaps is also otherwise unreliable. In addition, the guide flaps and edge flaps are at some distance from the guide rollers in the direction of travel of the wire, which causes delays in wire adjustment and control. Also, it is expensive to manufacture because it contains a number of different components.

Furthermore, solutions are known in which optical sensors or pressurized air streams are used to sense the position of the wire. However, the problem of such a solution is that the operation is also otherwise unreliable, compared to the monitoring in which the sensor becomes dirty and improper under harsh conditions and is mechanically performed. The use of inductive sensors was also tested, but the same problems arose in relation to them as well. The solution also requires that metal strips or the like detected by the inductive sensor be placed at the wire edge.

DISCLOSURE OF THE INVENTION It is an object of the present invention to provide a device by which the problems of the prior art can be avoided.

The device according to the invention is such that at least one sensor is arranged in relation to the guide flap and information about the lateral position of the wire is transmitted from said sensor to the control of the paper machine. Is characterized by.

The essential idea of the invention is that the guide flaps observe the edges of the wire in continuous contact and, when the wire is driven laterally, provide the guide information to the control unit controlling the actuator. It is arranged so that the wire guide roller is adapted to rotate and the wire is guided back to its correct lateral position. In addition, means are provided in connection with the guide flaps for transmitting information about the lateral overtravel of the wire to the control of the paper machine or the like. The guide flaps are placed after the guide rollers, very close to them, in the direction of travel of the wire,
The device for monitoring and controlling the lateral position of the wire forms the entity. Furthermore, an essential concept of the preferred embodiment of the invention is that the guide flap arms are provided with limit switches or corresponding sensors that determine the lateral position of the wire. The method can also record when the wire exceeds an allowable predetermined operating range. The essential concept of another preferred embodiment of the invention is that the guide flap has a sensor which continuously observes the lateral position of the wire and informs the controller of the papermaking machine about the lateral position of the wire. It is about transmitting information.

The present invention provides the advantage that no separate edge flaps are required on both edges of the wire and the wire position is only observed by the guide flaps. A sensor for observing the wire edge is located on the guide flap. Thus, the edge flap does not have to be manufactured and attached. The structure of the device is simple and very easy to maintain. The solution also allows the use of thin wires that are cheap and easy to drive. In addition, since the guide flaps are arranged close to the guide rollers, the wires in the guide flaps are well supported by the guide rollers and therefore the fine wires are no longer prone to bending due to the guide flaps. Thus, the wire edges can be observed accurately and reliably. The device of the present invention further allows the wire to run loosely as before, which prolongs the wire in use. When the guide flaps are arranged in relation to the guide rollers, no harmful delay occurs in the control device.

[0008]   The present invention will be described in more detail in the accompanying drawings.

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 is a top view of a prior art device for controlling the lateral position of a wire.
The wire 1 runs in the direction A. For various reasons, the wire can be driven sideways in a direction B transverse to the running direction of the wire. The position of the wire in the transverse direction B is sensed by a guide flap 2 arranged after the guide roller 3 in the running direction of the wire. The guide flaps are in continuous contact with the wire edges. The guide flaps, or "spoons", are plate-like elements that are normally bent to be slightly bent and are pushed by springs, for example against the wire edges. . The guide information is transmitted from the guide flaps to the control unit 4 which controls the actuators 5 operating the guide rollers. The actuator is typically a pneumatic bellows, and the pressure delivered to it is regulated by the pneumatic control valve of the control unit. Usually the guide flaps are arranged directly for mechanical use of the pneumatic control valve. Based on the guidance information obtained from the guidance flap, the actuator causes the wire to move in the longitudinal direction C of the wire.
Move one end of the guide roller. The other end of the guide roller is pivotally arranged on the frame so that the actuator rotates the guide roller. On the other side of the guide roller is another pneumatic bellows 8 to which a constant pressure is delivered. The direction of movement of the guide rollers is thus determined by the interaction of the pressures delivered to the first and second bellows. The known device further comprises edge flaps 6 and 7 which are arranged on both sides of the wire and give an alarm if the wire comes in contact with the flap. An alarm indicating that the edge area is exceeded is transmitted to the control unit 15 of the paper machine.
Thus, in connection with the wire guide, the edge flap and the guide flap are completely separate units from each other, and furthermore, they are complicatedly arranged at a considerable distance from each other.

FIG. 2 shows a simplified view of the device of the invention as seen from the movable end of the guide roller. The wire 1 is arranged to move in the direction A via a guide roller 3, the guide roller being raised so that the wire is slightly bent at the guide roller in order to make the guide more effective. Will be placed. The ends of the guide rollers are supported by a bearing support 9, which is a sliding block 1.
0 or can be pivoted relative to the frame 11 and moved in direction C, for example by rollers. The guide roller ends are rotated by actuators 5 and 8. The actuators are preferably pneumatic bellows as shown, but pneumatic and hydraulic cylinders, electric motors and other devices suitable for this purpose may also be used. Although the figure shows two different actuators arranged on opposite sides of the guide roller, the guide roller can also be used by only one actuator which can be moved in two directions or return. Exercise
For example, it may be implemented by a spring element. The guide rollers can also be moved from both ends, but this is usually not necessary. According to the inventive concept, the guide flap 2 is arranged very close to the guide roller. The guide flaps are then closer to the guide rollers so that the edges are more rigid due to the supporting action generated by the nearby guide rollers. Preferably, the guide rollers, the control unit and the guide flaps form an entity that facilitates the attachment of the desired cables, pipes, etc. and, if necessary, can be maintained via the inspection lid. The pneumatic duct leading to the air control valve 4 is shown in the figure by the dash-dotted line 16, the channel leading to the first actuator is at the dash-dotted line 17 and to the second actuator which is directed to transfer a constant pressure. The open channel is indicated by line 18. The conductor leading to the control unit of the paper machine is indicated by dashed line 19.

FIG. 3 shows details of the device according to the invention. The guide flap 2 is arranged at the free end of the arm 12, whereby the lateral movement of the wire 1 causes the arm to rotate in relation to the pivot point of the arm. The arm is coupled with an air control valve of the control unit 4 so that the movement of this arm opens and closes the connection from the compressed air source to the pneumatic bellows 5 depending on the lateral position of the wire. The allowable lateral extent of wire movement is indicated by the symbol L in the figure. Exceeding the permissible range of motion is controlled, for example, by edge sensors 13 and 14 arranged to provide an alarm to the paper machine controller 15. The edge sensor can be a limit switch, an inductive sensor, etc., arranged to be activated when the arm moves to a range. The relative position of the edge sensors is adjustable, and thus the amount of operating range that can be tolerated can be varied.

In addition, one or more sensors 20 for measuring the position of the guide flaps can be used, and the measurement results are transmitted to the paper machine controller 15. In this case, the lateral position of the wire can be measured continuously during the operation of the paper machine. Such an application is shown in FIG. Values corresponding to the allowable range of motion can be programmed into the controller / automatic machine of the paper machine. Information about the acceptable operating range L exceeding and the position of the wire can be utilized in maintenance when the conditions of the wire and the wire guide rollers are evaluated and also when the operating parameters of the paper machine are adjusted. It can also be seen from FIG. 4 that the guide flaps are also
It can be arranged to be moved linearly in direction B by means of a suitable sliding mechanism.

In this application, the control device of a paper machine is understood as various automatic devices, user interfaces and, most simply, the control panel of a paper machine. The control unit may, in its part, be at its simplest an air distributor with a mechanically or electrically actuated control valve for controlling a pneumatic actuator. The control unit may also be, for example, programmable logic for controlling the electric motor or other suitable controller between the actuator and the guide flap.

The drawings and related description are directed only to illustrate the concepts of the present invention. The details of the invention may vary within the scope of the claims. As a result, in addition to the plate-like flaps, the guide flaps refer to other elements which are applied for monitoring the position of the wire edge and which can be placed in physical contact with the wire edge.

[Brief description of drawings]

[Figure 1]   FIG. 6 is a top view of a prior art device.

[Fig. 2]   It is a schematic side view of the solution of the present invention.

[Figure 3]   FIG. 3 is a schematic diagram showing details of the solution of the present invention.

[Figure 4]   FIG. 6 is a schematic view showing details of another solution of the present invention.

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Claims (7)

[Claims] 1. A wire guide roller that traverses the traveling direction (A) of the wire (1).
3), the wire guiding roller being arranged to be rotated in the running direction of the wire by at least one actuator (5), and arranged with respect to the wire edge and observing the lateral position of the wire. A guide flap (2) adapted to do so that the wire guide roller (3) rotates and guides the wire (1) on the basis of the information provided by the guide flap on the lateral position of the wire. At least one sensor in a device for a wire guide roller of a paper machine including means arranged to inform a paper machine controller (15) of said lateral position of said wire. Information about the lateral position of the wire is arranged in relation to the guide flap (2) from the sensor. Apparatus characterized by being adapted to be transmitted to the control device of the papermaking machine (15). 2. The guide flap is arranged at a free end of a pivotally arranged arm, the arm being arranged to pivot in response to a lateral (B) position of the wire and the device comprising: At least one disposed in relation to said arm (12)
Two sensors (13, 14), whereby the lateral movement of said guide flap (2) and thereby the lateral movement of said wire is arranged such that it is determined by said sensor. The device according to claim 1. 3. A first and a second sensor are arranged on different sides of the arm at a distance from each other in the direction of movement of the arm (12), which distance allows an acceptable lateral working range of the wire. Device according to claim 2, characterized in that it is arranged to determine (L). 4. Device according to claim 3, characterized in that the relative position of the sensors is adjustable, whereby the size of the permissible operating range (L) is also adjustable. . 5. Device according to any one of the preceding claims, characterized in that the sensor is a limit switch. 6. The sensor is arranged to measure the position of the guide flap and thereby convey to the controller (15) of the paper machine the measuring information about the lateral position of the wire. The device of claim 1, wherein the device is 7. The guide flaps are arranged in close proximity in relation to the guide rollers, so that the control wire edge is more stable in the guide flaps due to the guide rollers in the immediate vicinity. Any one of the preceding claims
The device according to paragraph.