EP3075902A1 - Cleaning apparatus - Google Patents

Abstract

The invention relates to an apparatus and a method for cleaning the treadmill (1) of a dryer fabric in a papermaking plant. The device comprises at least one cleaning nozzle (40) for generating a high-pressure jet (60) of a liquid with a point of impact (61) on the treadmill, at least one cleaning head (80) with a discharge opening (84) and a main opening facing the treadmill (1) ( 81), wherein the cleaning nozzle (40) outside the cleaning head (80) is arranged. In the method according to the invention, the treadmill (1) is irradiated with at least one high-pressure jet (60) of a liquid, the cleaning device having a cleaning head (80) having an interior space, a discharge opening (84) and a main opening facing the treadmill (1) ( 81).

Description

The invention relates to an apparatus and a method for cleaning a treadmill of a dryer fabric of a papermaking plant.

Ever faster paper machine speeds require more and more efficient dry cleaning equipment. These should be free from breakdowns, have a very good cleaning performance, save resources (water, energy, treadmill material), not only remove dirt particles from the belt but also remove them in a controlled manner and also dry the dryer fabric as quickly as possible after cleaning.

In practice, various solutions are offered for this purpose.

The DE 295 17 859 U1 describes a cleaning system which cleans a conveyor belt by means of air or liquid jets generated by fixed nozzles, whereby dirt and / or water mist or residual water is passed through a cleaning head (referred to therein as a "suction cup") by means of a negative pressure generated therein can be sucked in and removed. The jet nozzles are mounted either inside or below the suction space.

The DE 693 14 805 T2 describes a cleaning device which generates at least one nozzle located in a cleaning head (referred to therein as "suction") a liquid jet for cleaning the surface and applies to the surface. In addition to the negative pressure generated in the cleaning head, compressed air is supplied to the main opening of the cleaning head so that it bounces on the treatment liquid deflected from the surface and material released from the surface Direction of the cleaning head cooperates with the suction effect of the cleaning head.

A disadvantage of the solutions of the prior art is that the nozzles, if they are disposed within the cleaning head, run the risk of clogging by the sucked, removed from the cleaned surface dirt. In addition, there is a risk that the cleaning head clogged by the detached and sucked dirt residues, especially if there are in the cleaning head, the edged nozzles or even only parts of the nozzles. If the nozzles are mounted outside of the cleaning head, the distance of the cleaning head opening to be cleaned surface had to be increased so that the rays hit the surface to be cleaned. The increased formation of splashing water and dirt had either to be accepted or compensated by increased use of suction energy.

The object of the present invention was to provide an apparatus and a method for cleaning a conveyor belt of a dryer fabric of a papermaking machine which avoids the disadvantages of the prior art.

The object is solved by the independent claims. Advantageous developments are defined in the subclaims.

In particular, the object is achieved by a cleaning device (20) for cleaning the treadmill (1) of a dryer fabric in a papermaking plant (2) comprising at least one cleaning nozzle (40) for producing a high pressure jet (60) of a liquid having a point of impact (61) on the Treadmill, at least one cleaning head (80) having a discharge opening (84) and a main opening (81) facing the conveyor belt (1), the cleaning nozzle (40) being arranged outside the cleaning head (80).

The treadmill is preferably the treadmill of a dryer fabric or the dryer fabric per se and is usually made of a porous, air-permeable material in which easily accumulate dirt and paper remnants. However, the cleaning device according to the invention is also suitable for analogous applications in which a preferred moving surface should be cleaned.

A cleaning nozzle or jet nozzle according to the invention is a nozzle which is set up to produce a jet of a fluid, preferably a jet of a liquid. It is preferably at least one diamond nozzle. The cleaning nozzle is preferably set up to produce a high-pressure jet. This pressure is preferably in the range from 250 to 600 bar, more preferably in the range from 350 to 560 bar. Most preferably, the pressure is 450 bar. Preferably, this liquid is water. The diameter of the nozzle opening is preferably in the range of 0.1 mm to 0.3 mm. Particularly preferably, the diameter is about 0.15 mm. The cleaning nozzle preferably has a connection hose which is set up to supply the fluid used. At the other end of the connection hose, a high-performance pump is preferably connected. The delivery tube is particularly preferably a Teflon tube. The beam direction - and thus also the point at which a jet generated by the cleaning nozzle impinges on the treadmill (the impact point) - is adjustable. Preferably, the beam direction is adjustable over the holder of the cleaning nozzle.

The orientation of a cleaning nozzle according to the invention can preferably be adjusted via two angles. On the one hand, this is the angle W1 which the imaginary projection of a high-pressure jet, which can be generated by the cleaning nozzle, encloses with the running direction of the moving belt (see 63 in FIG FIG. 7 ). On the other hand, this is the angle W2 which the high-pressure jet, which can be generated by the cleaning nozzle, encloses with the surface of the conveyor belt (see 64 in FIG FIG. 7 ). Preferably, the orientation of a cleaning nozzle according to the invention is preferably preferably electromechanically and / or hydraulically variable during the cleaning process.

The cleaning head is a component already known in a similar manner from the prior art. In DE 295 17 859 U1 and DE 693 14 805 T2 cleaning heads are described, which serve as a suction cup or suction chamber. The cleaning head in this invention is not limited to operation as a suction chamber as in the prior art. By further described below components, an operation of the cleaning head is provided in which takes place by excess pressure in the interior of the cleaning head, a removal of dirt and spray. Preferably, the cleaning head has a round cross-section and encloses an interior, in which substances such as the resulting during cleaning and dirt leading with splash water and / or dirt and / or suspended matter can be collected. Furthermore, the cleaning head preferably has a discharge opening, through which the collected substances can be transported away from the interior of the cleaning head, or can escape. Preferably, the cleaning head is a tube-like component. A particularly preferred arrangement is for the central axis of the cleaning head to be located 3-8 mm in front of the tangential line of the dryer fabric return roll or any of the dry tread rolls of the running treadmill. Preferably, the cleaning head is arranged perpendicular to the surface of the treadmill. The cleaning head preferably has at the discharge opening - in the case of a tube, for example, on the pipe end facing away from the treadmill - a connection piece on which the cleaning head is preferably connectable to a drain and / or vacuum system. Preferably, the fitting is a quick-release system. Through a Quick release system, the cleaning head is quickly connected or disconnected and replaceable. If he needs a repair or a thorough cleaning, he can be decoupled time-saving. This long service life of the cleaning device and thus the papermaking system are avoided. Preferably, the cleaning head is telescopically assembled from a plurality of pipe segments.

The treadmill facing opening of the cleaning head is the main opening. Preferably, the diameter of the cleaning head increases toward the main opening. Preferably, the diameter of the main opening is in the range of 50 mm to 400 mm, more preferably the diameter is about 230 mm. The interior space between the main opening and the discharge opening preferably defines a discharge path for the collected substances. The cleaning head preferably has kinks and / or curves between the main opening and the discharge opening, so that the discharge opening is preferably located laterally of the conveyor belt. The cleaning head preferably has a sealing device on the cleaning head opening. This sealing device is preferably a rubber lip adapted to the opening geometry. The cleaning head preferably has closable openings or inspection openings in its lateral surface. Preferably, these closable openings in the region of the cleaning head end facing away from the treadmill -. in the region of the tread end facing away from the treadmill - attached, more preferably in the range of kinks and / or curvatures of the cleaning head. The closable openings are preferably designed such that the interior of the cleaning head can be cleaned from the outside. The advantage is that for the eventual case of a moderate blockage, the cleaning head can be easily cleaned from the outside, for example by rinsing.

The device according to the invention has at least one cleaning nozzle which is outside the cleaning head is appropriate. This cleaning nozzle is preferably located outside of an existing in the interior of the cleaning head air flow, which leads in operation a mixture of dirt and water with it. The cleaning nozzle is thus protected from contamination by dirt and water in the air stream. Particularly preferably, a cleaning nozzle is arranged outside the cleaning head and outside the imaginary extension of the cleaning head between the main opening and the treadmill. Preferably, a cleaning nozzle attached outside the cleaning head has a greater distance from the treadmill than the main opening. The cleaning head is preferably rotationally particularly preferably translationally adjustable relative to at least one of these existing cleaning nozzles. Preferably, the distance and / or the orientation of at least one cleaning nozzle relative to the cleaning head is variable. Preferably, at least one cleaning nozzle attached outside the cleaning head has a minimum distance greater than zero, preferably in the range of 0.1 mm to 500 mm, particularly preferably 1 mm to 250 mm, very particularly preferably 2 mm to 90 mm, and still more particularly to the outer surface of the cleaning head preferably 3 mm to 80 mm, more preferably still 5 mm to 70 mm and furthermore very particularly preferably 10 mm to 60 mm. Particularly preferably, the nozzle opening has this just mentioned minimum distance to the outer surface of the cleaning head. Preferably, the cleaning nozzle is arranged so that a fluid jet generated by the cleaning nozzle bridges a preferably free path outside the cleaning head, before it enters the interior of the cleaning head. Preferably, the cleaning nozzle is not in direct contact with the cleaning head. The cleaning nozzle is preferably connected to the cleaning head solely by means of a holder projecting preferably from the outer wall of the cleaning head.

Due to the described arrangement of the cleaning nozzle - including the nozzle nut ("nozzle retaining nut") - outside of the cleaning head this is not exposed to a present in the interior of the cleaning head airflow. The arrangement of the cleaning nozzle and especially the nozzle opening outside the cleaning head and not within, the way this air flow is not obstructed. The maintenance access to the existing cleaning nozzles is free. The nozzles are also not clogged by the suspended matter or contaminants in the air, which carries especially a present within the cleaning head of the air flow with it. In addition, so that a cleaning head can be used in a simple design, without internally mounted brackets, troughs or Anschraubbuchsen o.ä. for cleaning nozzles, where the dirt collects. The cleaning head is also easier to clean.

The cleaning head and the existing cleaning nozzles - in later described further embodiments, the respective further described components - can also be used in other cleaning devices. The cleaning head together with the components attached thereto is preferably 5 mm to 20 mm apart from the treadmill during the cleaning operation. Particularly preferably, this distance is about 10 mm.

In a further exemplary embodiment of the present invention, the wall of the cleaning head (80) has at least one inlet opening (82) and at least one cleaning nozzle is aligned so that a high-pressure jet (60) from the cleaning nozzle (40) can be conveyed from outside through one of the existing inlet openings (82). 82) hits the treadmill (1).

An inlet opening is for example a small hole, a hole, an oblique hole, preferably parallel to the perpendicular to the treadmill level cleaning head axis (for example: the tube center axis, if the cleaning head is preferably a tube-like component) extending gap, a recess or other passage having at least the diameter of the high-pressure jet. The diameter of such an inlet opening is in the range of preferably 0.1 mm to 200 mm, particularly preferably 0.125 mm to 100 mm, very particularly preferably 0.15 to 10 mm, furthermore very particularly preferably 0.15 mm to 3 mm. At least one such inlet opening is located in the wall of the cleaning head. By such an inlet opening a high-pressure jet from the outside into the interior of the cleaning head is feasible. The impact point of the cleaning nozzle located outside the cleaning head is thus adjustable to a point on the treadmill which lies within the outline of the projection of the geometry of the main opening on the treadmill. Such a point would be hidden without the inlet opening through the lateral wall of the cleaning head when attaching the cleaning head to the main opening in the immediate vicinity of the treadmill. An inlet opening can also be covered by an adhesive tape, for example, so that a cleaning jet then subsequently shoots itself a hole through the adhesive tape and thus the inlet opening has a diameter which is precisely matched to the cleaning jet diameter.

The inlet opening allows, despite the attached near the treadmill cleaning head at least one jet on the treadmill in a preferably in the air flow of the cleaning head point preferably within the projected on the treadmill inner contour of the main opening of the cleaning head can impinge on the treadmill. Dirt and wastewater can be collected directly at the place of origin, preferably transported away, without a large gap between the main opening and the treadmill is present through which can escape to a dirt and on the other the preferred Power to produce a present in the cleaning head air flow would not be concentrated on the place of formation of dirt and suspended matter (or similar). At the same time, the cleaning nozzles attached outside the cleaning head are located in a position protected against contamination. In addition, this arrangement allows smaller diameter of the cleaning head and the main opening and thus a much simpler design and a higher effect of existing in the cleaning head air flow to the area of the impact points of existing cleaning jets. Energy savings are the positive result. It is also advantageous that the impact points of the high-pressure jets - depending on the size of the inlet openings in the cleaning head - are still easily adjustable or adjustable. Even a cleaning with a swirl jet from outside the cleaning head is feasible. The entire system can be flexibly adapted to different requirements.

In a further embodiment of the present invention, in the presence of more than one cleaning nozzle (40), the cleaning nozzles (40) are distributed around the cleaning head (80) and oriented such that the high pressure jets (60) generated by the cleaning nozzles (40) are directed to one Area of the treadmill (1), which lies within the imaginary projection of the outline of the main opening (81) on the treadmill (1).

Preferably, the cleaning nozzles are distributed at equal intervals around the cleaning head around. Particularly preferably, the cleaning nozzles are distributed by more than half the circumference of the cleaning head. Particularly preferably, three cleaning nozzles are arranged. Preferably, the number of existing cleaning nozzles is equal to the number of existing inlet openings. Preferably, the cleaning nozzles are aligned so that in each case only one cleaning nozzle is associated with an inlet opening.

Advantageously, the cleaning nozzles are aligned so that the generated high-pressure jets from different directions on the treadmill preferably impinge on a line parallel to the running direction of the treadmill. Advantageously, the cleaning nozzles are aligned on a small, preferably elliptical surface on the treadmill in the range of preferably 1 mm ² and 8 mm ² , more preferably of 2 mm ² and 4 mm ² , preferably in the region of the central axis of the main opening.

So only a small area is wetted by the liquid and the beam energy is applied concentrated. Preferably, all impingement points of the high-pressure jets lie within a circular area with a radius of preferably 5 cm, particularly preferably 16 mm, very particularly preferably 5 mm.

Preferably, the cleaning nozzles are aligned to points that have a respective distance from each other of not more than 1 cm, preferably not more than 5 mm, more preferably not more than 3 mm, most preferably not more than 2 mm.

By irradiating only a small area of the treadmill, only a small area of the treadmill is wetted with liquid and the beam energy is concentrated in a small area. This increases the cleaning power and at the same time a subsequent independent drying or drying carried out by a drying device can be carried out more effectively, since only a small area has to be dried. Effective drying is very beneficial for a dryer fabric, as waterstrips in the newly made paper web are created by a non-thoroughly and evenly dried dryer fabric and the paper thus loses quality.

Preferably, when using three cleaning nozzles, the cleaning nozzles are aligned (see FIG. 7 ), that preferably the first two cleaning nozzles transverse to Running direction of the tread and preferably aligned with two points whose imaginary connecting line is preferably parallel to the running direction of the treadmill and has a length in the range of preferably 0.5 mm to 3 mm, more preferably 1 mm to 2 mm. For the nozzles, an angle W1 is set in the range of preferably x ± 45 °, more preferably x ± 15 °, most preferably x ± 5 °, where x = 90 ° for one nozzle and x = 270 ° for the opposite nozzle , The third cleaning nozzle is aligned to a third point. The third point in the running direction of the treadmill preferably lies after the point of impact of the first two cleaning nozzles at a distance of preferably 0.5 mm to 3 mm, particularly preferably 1 mm to 2 mm. Preferably, the orientation of the third nozzle W1 is 180 ± 5 °, more preferably 180 ± 2 15 °, most preferably 180 ± 0.1 °. W2 is in each case for one of the existing cleaning nozzles in the range of preferably 5 ° and 85 °, more preferably 10 ° and 60 °, most preferably 15 ° and 45 °.

In another embodiment of the present invention, the cleaning nozzles (40) are aligned so that the high pressure jets (60) have a common point of impact (61) on the treadmill (1).

Preferably, the high-pressure jets are approximately aligned with a common impact point.

In another embodiment of the present invention, at least one of the existing cleaning nozzles (40) is arranged to generate a laminar high pressure jet (60).

In a further embodiment of the present invention, the cleaning device (20) has a tempering unit (70) for controlling the temperature of the high-pressure jets (70).

The tempering unit is preferably arranged in the region of the high-performance pump. The tempering unit preferably has a continuous flow heater for controlling the temperature of the high-pressure jets.

In a further embodiment of the present invention, the temperature control unit (70) has a heat exchanger (71). In a further exemplary embodiment of the present invention, at least one device (100) for supplying compressed air (101) is arranged on the treadmill in the region of at least one impact point (61) of at least one high-pressure jet (60).

The device for supplying compressed air is preferably a preferably annular hollow body (torus, or "Donut"), which preferably has a connection for a compressed air hose, particularly preferably a channel for supplying compressed air from a compressed air pump or compressed air source to the hollow body. The device for supplying compressed air is preferably arranged at a distance of between 25 mm and 250 mm, particularly preferably between 100 mm and 130 mm, from at least one impact point. Preferably, it is arranged on the same side of the treadmill, on which the cleaning nozzle is arranged. Preferably, the shape of the hollow body is adapted to the shape of the main opening of the cleaning head. The device for supplying compressed air is: preferably arranged on the main opening; preferably attached without clearance to the main opening; preferably realized with the cleaning head in a structural unit.

In a further embodiment of the present invention, the means (100) for supplying compressed air (101) at least one air supply opening (102), wherein the existing air supply openings (102) are arranged so that the supplied compressed air (101) Air curtain (103) which deflects the rebounding from the treadmill (1) liquid in the direction of the main opening (81).

Air supply openings are preferably small holes and / or gaps. They preferably have a diameter in the range of preferably 0.1 mm to 1.5 mm, particularly preferably 0.3 mm to 1 mm and very particularly preferably between 0.35 mm and 0.8 mm, particularly preferably a diameter of approx 0.4 mm. In a preferred embodiment of the device for supplying compressed air as a preferably annular cavity compressed air can be supplied via the existing connection in the cavity and then out of the cavity through the air supply openings addition. Preferably, the air supply openings are arranged and aligned so that the gap between the means for supplying compressed air and the treadmill can be shielded by compressed air.

In another embodiment of the present invention, the means (100) for supplying compressed air (101) is arranged so that around the edge of the main opening (81) air supply openings (102) are distributed substantially to a point within an imaginary extension of the cleaning head (80) are aligned.

Preferably, a hollow body, which is adapted to the shape of the main opening and is preferably arranged at the edge of the main opening, provided with air supply openings. Preferably, the hollow body is arranged on the main opening outside of the cleaning head. Preferably, the hollow body surrounds the cleaning head. The air supply openings are preferably arranged so that they form an angle between 15 ° and 45 ° with the plane of the treadmill, particularly preferably an angle of approximately 30 °. They are aligned so that the individual compressed air jets to the central axis of the cleaning head converge. Preferably, 6 to 30, more preferably about 12 air supply openings are preferably arranged at mutually equal intervals in the device for supplying compressed air.

In a further embodiment of the present invention, a device (120) for supplying at least one water jet (121) is provided within the cleaning head (80), wherein the generated water jets (121) are oriented substantially in a direction towards the discharge opening (84) ,

The device for supplying at least one water jet is preferably a preferably annular body lying in the cleaning head, which preferably has holes as small water nozzles. Pressurized water can be fed into the body and escapes through the existing holes. They preferably have a diameter of 0.5 mm to 1.5 mm, more preferably of about 0.8 mm. Preferably, the holes are aligned so as to produce a jet of water that is substantially parallel to the inner wall of the cleaning head in the direction of the air flow within the cleaning head. The device for supplying at least one water jet is preferably attached to the inner wall of the cleaning head and is preferably extended around the inner wall. It is set up so that its construction does not substantially reduce the air flow in the interior of the cleaning head. Preferably, it is arranged above the existing inlet openings for the high-pressure jets. It is preferably provided as a flushing device.

In a further embodiment of the present invention, a device (140) for supplying compressed air (141) is provided within the cleaning head (80).

The possible embodiments of the device just described for supplying at least one water jet also apply to the supply of compressed air within the cleaning head. However, the means for supplying compressed air preferably has a connection for supplying compressed air. Particularly preferred compressed air can be supplied via a channel. Preferably, the holes are so and preferably aligned as small compressed air nozzles that they produce at least one compressed air jet, which is parallel to the inner wall of the cleaning head in a direction toward the discharge opening, ie preferably in the direction of an air stream generated in the cleaning head, or particularly preferred extends substantially spirally along the inner wall of the cleaning head and propagates to the discharge opening. Preferably, the holes are arranged slightly obliquely relative to an imaginary transverse plane through the cleaning head for the spiral compressed air flow.

Particularly preferably, the described device for supplying at least one water jet and attached within the cleaning head supply of compressed air are realized in a structural unit. The cleaning head is preferably connected to the discharge opening to a collecting system for the removal of dirt and spray.

In a further embodiment of the present invention, the cleaning device (20) has a drying unit (160) spaced apart from the cleaning head (80) in the running direction of the belt (1).

The dryer unit preferably has means for drying the belt. Preferably, the dryer unit is in the same position across the treadmill as the points on the treadmill targeted by the existing cleaning nozzles. Particularly preferably, the dryer unit is in the same position transverse to the treadmill as the center of the Arranged main opening, that is arranged in a direction parallel to the running line with the center of the main opening. Preferably, the dryer unit is attached to the cleaning head.

In a further embodiment of the present invention, the dryer unit (160) has at least one air nozzle (161) directed onto the conveyor belt (1).

Preferably, the existing air nozzles are each preferably mounted in groups on a holder, through which the existing air nozzles are aligned on the treadmill. Preferably, the dryer unit has a plurality of air nozzles in one, preferably a plurality of rows along the running direction of the conveyor belt. Particularly preferably, the dryer unit has two rows of air nozzles along the running direction of the belt, wherein each row preferably has two air nozzles. Preferably, different rows are offset from each other.

The air nozzles present on the dryer unit are preferably designed to produce a stream of air which is narrow at the nozzle opening and wide away from the air nozzle, particularly preferably to produce a conical air stream. Preferably, they are adapted to generate an air pressure jet preferably by compressed air in the range of preferably 0.5 bar to 6 bar, more preferably by compressed air of about 4 bar. They are preferably arranged such that the generated air jets strike the wetted areas of the cleaning nozzles with liquid.

In a further embodiment of the present invention, in the presence of more than one air nozzle (161), the existing air nozzles (161) are arranged to be aligned with the treadmill (1) from at least two different directions.

Preferably, the existing air nozzles are arranged so that in addition at least partially overlap the beam profiles. Particularly preferably, the existing air nozzles are arranged so that they are aligned at least from two different directions on a common surface.

In another embodiment of the present invention, at least the cleaning head (80) and at least one of the existing cleaning nozzles (40) are mounted on a support (180) and movable transversely to the running direction of the belt (1).

The object is further achieved by an inventive method for cleaning a treadmill (1) of a dryer in a papermaking plant with a cleaning device (20), wherein the cleaning device has a cleaning head (80) having an interior, a discharge opening (84) and a The treadmill (1) facing the main opening (81), comprising the step of irradiating the treadmill (1) with at least one high-pressure jet (60) of a liquid which is preferably generated at a position outside the cleaning head (80) by a cleaning nozzle (40) ,

By generating the high-pressure jet at a position outside of the cleaning head of the collected by the cleaning head dirt and / or suspended matter, etc., the cleaning nozzle does not pollute. In particular, an air stream preferably present in the interior of the cleaning head can not pollute the cleaning nozzle with entrained dirt and / or suspended matter, etc.

In a further preferred method, the cleaning head (80) additionally has at least one inlet opening (82) in the wall of the cleaning head (80). and at least one high-pressure jet (60) radiates from outside through one of the inlet openings (82) present in the cleaning head (80) onto the treadmill (1).

The irradiation of the cleaning head allows the main opening to be positioned very close to the belt. Nevertheless, the existing high pressure jets can be blasted onto the treadmill with a preferably acute angle between the surface normal with respect to the treadmill and the high pressure jet. If the main opening is close to the treadmill so that there is only a small gap of preferably 5 mm to 20 mm, more preferably 8 mm to 14 mm, most preferably about 10 mm between the treadmill and the edge of the main opening on the one hand, the splash water and the resulting dirt by the enclosure of the area that is being cleaned, collected. On the other hand, there is a preferred generation of a negative pressure at the discharge opening of the cleaning head, wherein the negative pressure causes an air flow as a suction from the main opening to the discharge opening, with the same suction a stronger suction near the emergence of the spray water and the dirt. In addition, in a particularly preferred generation of an overpressure in the region of the interior of the cleaning head near the main opening by means of a device for supplying compressed air, the resulting air flow in the direction of the discharge opening substantially larger, as an escape of air through the now small gap between the main opening and The treadmill is substantially prevented.

In another preferred method, when the treadmill (1) is irradiated with more than one high-pressure jet (60), the high-pressure jets (60) radiate from different directions onto the treadmill.

Preferably, the high pressure jets radiate to the belt so that the jets in the different wells and / or Pore of the treadmill with penetrate. More preferably, the high-pressure jets irradiate a line parallel to the running direction of the treadmill, so that a point of the treadmill is cleaned by the movement of the treadmill at short intervals of time with high-pressure jets from different directions. Preferably, the existing high pressure jets radiate to an area near the center of the plan view of the main opening projected onto the treadmill. The high-pressure jets preferably perform an approximately punctual cleaning of the treadmill.

In a further preferred method, the high-pressure jets (60) impinge on the treadmill (1) in a common impact point (61).

Preferably, the treadmill is thereby cleaned at one point simultaneously with high-pressure jets from different directions.

In a further preferred method, the liquid intended for the high-pressure jets (60) is additionally heated.

Preferably, the liquid is heated to a range between 20 ° and 200 °. Particularly preferably, the liquid is heated to about 60 °. Thus, the capillary action in the wire is much lower and the post-drying is significantly supported.

In a further preferred method, a vacuum source is additionally connected to the discharge opening of the cleaning head (80), so that an air flow (83) results from the main opening (81) in the direction of the interior of the cleaning head (80).

The air flow is modeled on the principle of the vacuum cleaner. By way of example, the cleaning head used here with to be compared to a wet vacuum cleaner. The suction preferably causes suction of the air and / or water that is on the other side of the treadmill than the cleaning head. The vacuum source is for example a suction pump.

In another preferred method, the airflow (83) removes dirt and / or depleted water.

Dirt is especially the detached from the treadmill by the cleaning dirt particles.

The air stream preferably conveys dirt and / or spent water preferably via a pipe system of the carrier device. Preferably, the spent water is recycled for reuse.

In a further preferred method, compressed air (101) is additionally supplied via a device (100) for supplying compressed air in the region of at least one impact point (61), so that the liquid rebounding from the raceway (1) is deflected by the supplied compressed air (101) Direction of the main opening (81) is deflected.

Preferably, the compressed air is supplied to the main opening. Compressed air is preferably supplied in such a way that an air curtain forms around the high-pressure jets striking the treadmill. Preferably, compressed air is supplied via a plurality of air pressure nozzles at the main opening, wherein the supplied compressed air preferably converges toward the center of the main opening and preferably generates a strong air flow towards the discharge opening of the cleaning head. Preferably, by the supplied compressed air spray, which diverges according to experience parallel to the surface of the treadmill, and preferably dirt that mixes with the spray, deflected into the cleaning head inside. Preferably, compressed air is preferred in the range of 1 bar to 600 bar, preferably 3 bar to 30 bar, more preferably 5 bar to 12 bar, most preferably used about 6 bar. These areas preferably also apply to compressed air which is supplied with a device for feeding inside the cleaning head and / or which is used by one or more air nozzles of a drying unit for drying the conveyor belt. The devices for supplying compressed air and the dryer unit are preferably set up for the use of appropriate pressures.

In a further preferred method, the supply of compressed air generates an overpressure in the region of at least one impact point (61), wherein the overpressure also propagates into the interior of the cleaning head (80) and generates an air flow (83) which passes through the rebounding liquid the interior of the cleaning head (80) transported away.

The overpressure is preferably in the same areas as the compressed air supplied to generate the air curtain.

The area of at least one impact point is preferably the space enclosed by the created air curtain. Preferably, the area of at least one point of impact is approximately the main opening of the cleaning head.

The propagation of the overpressure into the interior of the cleaning head preferably takes place up to the discharge opening, after which again an air pressure is set slightly above or equal to the ambient air pressure or normal pressure. The air pressure therefore preferably decreases in the interior of the cleaning head from the region of at least one point of impact up to the discharge opening, since a compensation of overpressure and the ambient air pressure takes place via the discharge opening.

Surprisingly, it has been found that by supplying compressed air, such an overpressure can occur in the region of at least one impingement point and this overpressure generates an air flow through the interior of the cleaning head. This air flow is sufficient to transport dirt and spray water to the discharge opening. The overpressure, as it were, presses the dirt and the spray water out of the cleaning head in the direction of the discharge opening. In this case, for example, even a vertical transport path can be bridged against the force of gravity of more than 50 cm at a pressure of about 6 bar.

It is also particularly advantageous if the cleaning head has a small distance from the treadmill. This small distance is preferably made possible by the existing in the cleaning head inlet openings. Contrary to the expert expectation arises despite the preferred existing inlet openings caused by the pressure air flow in the interior of the cleaning head, with the dirt and spray can be transported away to the discharge opening. A person skilled in the art would expect that the generated overpressure escapes through the inlet openings and / or the gap between the main opening of the cleaning head and the treadmill and thus does not generate sufficient air flow within the cleaning head and thus refrain from generating an overpressure in the interior of the cleaning head. A major advantage of this type of generation of an air flow in the interior of the cleaning head is that it is preferably possible to dispense with devices for generating a negative pressure, that is, for example suction pumps. Overpressure sources are usually already present in the (papermaking) factory, but rarely are vacuum sources. Preferably, it is also possible to combine the generation of an overpressure in the interior of the cleaning head and the connection of a vacuum source to the discharge opening, whereby the air flow in the Interior can be reinforced, but this is an additional component (vacuum source) necessary.

In a further preferred method, in addition at least one water jet (121) is generated inside the cleaning head (80), which removes dirt and used water.

The water jet is preferably generated in the direction of the air flow within the cleaning head. Preferably, a plurality of water jets within the cleaning head, preferably generated annularly on the inner wall of the cleaning head. Preferably, dirt deposits on the inner wall of the cleaning head are detached by the at least one water jet and transported further in the direction of the air flow. For this purpose, a water pressure of 4 bar to 6 bar is preferably used, particularly preferably a water pressure of 5 bar.

In a further preferred method, compressed air (141) is additionally supplied within the cleaning head (80), which removes dirt and used water.

The effect of the at least one water jet described above is preferably achieved in the same way by supplied compressed air inside the cleaning head. Particularly preferably, the effect is enhanced by the combined supply of compressed air and at least one jet of water. The spent water and the detached dirt particles are preferably transported away through the discharge opening, preferably into a collecting channel. This collecting channel is preferably washed out from time to time by fixed nozzles.

In a further preferred method, the compressed air (141) is supplied in the interior of the cleaning head (80) in such a way that an air vortex is created.

Preferably, the air vortex is generated by the use of a plurality of compressed air nozzles inside the cleaning head, the compressed air lightly obliquely radiate to the inner wall of the cleaning head so that it propagates slightly helical in the direction of the air flow inside the cleaning head. By this effect, the existing water and the dirt are preferably vortexed and transported away with the air flow. Preferably, a Venturi effect is generated by at least one change in cross section of the cleaning head in the interior of the cleaning head.

In a further preferred method, the treadmill (1) is additionally dried after irradiating the treadmill (1) with at least one high-pressure jet (60) of a liquid through a downstream drying unit (160).

Preferably, the portion of the treadmill that has been freshly cleaned is dried by the dryer unit.

In a further preferred method, the dryer unit (160) radiates at least one compressed air jet (162) onto at least one region of the conveyor belt (1).

Preferably, at least one conical compressed air jet is generated via a correspondingly arranged nozzle. The compressed air removes the water in the treadmill or the fluid used to clean the treadmill.

In another preferred method, when more than one compressed air jet (162) is used, the compressed air jets (162) radiate at least from two different directions onto areas of the treadmill (1).

Preferably, the various compressed air jets strike the belt in such a way that depressions and / or pores present in the treadmill are irradiated with compressed air from different directions. Preferably, a point of the treadmill is temporally successively - due to its movement relative to the dryer unit - irradiated from different directions with compressed air through the dryer unit. The included by the air jets and the surface of the treadmill angle (analogous to W2) is preferably in the range between 15 ° and 45 °, more preferably it is 30 °. The pressure used for the production of these air jets is preferably in a range of 0.5 bar to 6 bar, more preferably 4 bar.

In a further preferred method, when using more than one compressed air jet (162), the areas of the moving belt (1) irradiated by the compressed air jets (162) at least partially overlap.

With the described method cleaning of the treadmill with minimal energy consumption for the production of compressed air and high-pressure jets and with a minimum water consumption is possible.

Fig. 1

eine Skizze einer erfindungsgemäßen Vorrichtung mit einem Reinigungskopf sowie einer außerhalb des Reinigungskopfes angeordneten Reinigungsdüse,

Fig. 2

eine Skizze einer erfindungsgemäßen Vorrichtung mit einem Reinigungskopf sowie einer außerhalb des Reinigungskopfes angeordneten Reinigungsdüse, wobei der Reinigungskopf eine Eintrittsöffnung für den von der Reinigungsdüse erzeugten Hochdruckstrahl aufweist,

Fig. 3a/b

eine Skizze einer erfindungsgemäßen Vorrichtung mit einem Reinigungskopf, einer außerhalb des Reinigungskopfes angeordneten Reinigungsdüse und einer Einrichtung zur Zuführung von Druckluft im Bereich des Auftreffpunktes des Hochdruckstrahls auf dem Laufband, ohne (3a) und mit (3b) einer Eintrittsöffnung für den Hochdruckstrahl.

Fig. 4

einen Querschnitt einer erfindungsgemäßen Vorrichtung mit einem Reinigungskopf, mehreren außerhalb des Reinigungskopfes angeordneten Reinigungsdüsen, einer Einrichtung zur Zuführung von Druckluft im Bereich des Auftreffpunktes des Hochdruckstrahls auf dem Laufband, einer Einrichtung zur Zuführung von Wasserstrahlen im Inneren des Reinigungskopfes sowie einer Einrichtung zur Zuführung von Druckluft im Inneren des Reinigungskopfes,

Fig. 5

eine Darstellung einer erfindungsgemäßen Vorrichtung, die zusätzlich eine Trocknereinheit aufweist,

Fig. 6

eine Darstellung einer erfindungsgemäßen Vorrichtung, die zusätzlich eine Trocknereinheit aufweist, jedoch keine Einrichtung zur Zuführung von Druckluft im Bereich des Auftreffpunktes des Hochdruckstrahls auf dem Laufband und

Fig. 7

eine Hilfsskizze, die weder maßstäblich noch winkeltreu die Definition für Winkel der Ausrichtung einer oder mehrere Düsen bezüglich veranschaulicht.

The invention will now be further illustrated by way of example with reference to the drawings. Hereby show:

Fig. 1

a sketch of a device according to the invention with a cleaning head and arranged outside the cleaning head cleaning nozzle,

Fig. 2

a sketch of a device according to the invention with a cleaning head and a cleaning nozzle arranged outside the cleaning nozzle, wherein the cleaning head has an inlet opening for the has high-pressure jet generated by the cleaning nozzle,

Fig. 3a / b

a sketch of a device according to the invention with a cleaning head, arranged outside the cleaning head cleaning nozzle and means for supplying compressed air in the region of the impact point of the high-pressure jet on the treadmill, without (3a) and with (3b) an inlet opening for the high-pressure jet.

Fig. 4

a cross-section of a device according to the invention with a cleaning head, several arranged outside the cleaning head cleaning nozzles, means for supplying compressed air in the area of impact of the high pressure jet on the treadmill, a device for supplying water jets inside the cleaning head and a device for supplying compressed air in Inside of the cleaning head,

Fig. 5

a representation of a device according to the invention, which additionally has a dryer unit,

Fig. 6

a representation of a device according to the invention, which additionally has a dryer unit, but no means for supplying compressed air in the region of the impact point of the high-pressure jet on the treadmill and

Fig. 7

an auxiliary sketch that does not illustrate the definition of angles of alignment of one or more nozzles with respect to either scaled or angled.

In FIG. 1 is a section of a papermaking plant 2 shown, indicated by a running over a roller 21 treadmill 1 (drawn only in cross section). The cleaning device 20 according to the invention is shown in a slightly perspective view. It consists in this exemplary embodiment of a cleaning head 80, which is here drawn as a detail of a cylinder. The cleaning head 80 is open at the bottom. This opening is the main opening 81. The cleaning head is arranged vertically above the treadmill at a distance of 35 mm. Further, a cleaning nozzle 40 is part of the cleaning device 20, which is aligned with the treadmill and disposed outside of the cleaning head 80. A hose (not shown) connects the cleaning nozzle 40 to a high pressure pump (not shown). The impact point 61 and the center axis of the cleaning head are here on the Tangentiallinie running from the roller 21 treadmill. 1

In operation of the cleaning device 20, an air flow 83 in the inner cleaning head via a connected to the discharge port 84 pump or other means for generating a suction - these components are not shown here - set. This creates an air flow 83 inside, indicated by a dashed arrow. Air, indicated by dashed arrows in the direction of the main opening 81, is sucked from outside the pipe through the main opening 81. At the same time, a high-pressure jet 60 consisting of water is generated via the cleaning nozzle 40 and pumping means (not shown). This has a diameter of 0.15 mm, radiates on the treadmill 1 and meets there at the point of impact 61.

By this arrangement, the band is cleaned at the impact point 61 by the high-pressure jet 61 of dirt. As the treadmill 1 moves, it is so continuously cleaned. The detached from the treadmill 1 dirt particles and at The resulting spray cleaning water are collected by the cleaning head and transported away by the air stream 83. Thus, the detached dirt particles do not settle again on the tape and the water used for cleaning can be used for the most part after a reprocessing for cleaning. The arrangement of the cleaning nozzle 40 outside of the cleaning head 80, this is not the air stream 83, which transports dirt particles suspended. Contamination of the cleaning nozzle 40 by detached dirt particles is therefore prevented by this arrangement.

In FIG. 2 is a cleaning device according to the invention similar to that of FIG. 1 shown, with the difference that now an inlet opening 82 is provided in the cleaning head. This inlet opening 82 is an oblique bore with the diameter of 0.25 mm. There is also a difference FIG. 1 in that the cleaning head is now arranged at a distance of 10 mm from the treadmill.

During operation of the cleaning device 20, in turn, an air flow 83 is generated within the cleaning head 80 and a high pressure jet 60 (see description FIG. 1 ). However, it is different here that the high-pressure jet 60 strikes the treadmill 1 through the inlet opening 82 and consequently also through the main opening 81 at the impact point 61.

Due to the existing inlet opening 81 a smaller distance of the cleaning head 80 to the treadmill is possible in this exemplary embodiment. The air flow 83 produced by the suction thus acts even more strongly at the impact point 61, the location of the formation of the spray water and the dirt particles. Both the spray water and the dirt particles can therefore be transported away more effectively via the cleaning head 80. In addition, the cleaning nozzle 40 is now even better from contamination by the dirt particles protected because the cleaning head 80 acts as a shield for the cleaning nozzle 40.

In FIG. 3a the cleaning device 20 according to the invention is similar to that of FIG. 1 shown, with the essential difference that now two additional devices 100 for supplying compressed air 101 in the region of the impact point 61 are arranged. These are indicated as air pressure nozzles 100. The air pressure nozzles are each supplied via a hose (not shown), which carries compressed air. The point of impact 61 and the center axis of the cleaning head are here in front of the tangential line of running from the roller 21 treadmill 1, at a point where the treadmill 1 rests on the roller.

During operation of the cleaning device 20, the air pressure nozzles each radiate an air pressure jet 101 against the treadmill, so that the spray water, which usually entrains the detached dirt particles during operation and splashes away substantially parallel to the treadmill 1 from the impact point 61, strikes the air pressure jets 101. The spray bounces off the air pressure jets 101 and is thus directed in the direction of the main opening 81. The air jets 101 are deflected via the treadmill 1 in the direction of the main opening 81. The coincidence of the air jets 101 and the air jets deflected on the material web generates an overpressure which generates an air flow 83 essentially vertically upward within the cleaning head 80. With this air stream 83 of the collected dirt and spray is pushed up to the discharge opening 84 and through this.

By additionally attached means 100 for supplying compressed air 101, a deflection of the spray water and the detached dirt particles in the direction of the main opening 81 is made possible. The generated airflow 83 can therefore capture this very effectively. The losses of Splashing water and the risk of re-contamination of the treadmill 1 or the cleaning nozzle 40 by detached dirt particles are greatly reduced. In addition, a simultaneous shielding of the sprayed and dirty water and its removal is achieved only by the use of compressed air. There is no vacuum required within the cleaning head 80 to suck in splash and dirty water.

In FIG. 3b is a cleaning device 20 according to the invention similar to that of FIG. 3a shown with the difference that the cleaning beam 60 radiates through an inlet opening 82 on the treadmill 1 and this allows a closer positioning of the main opening 81 to the impact point 61 at the same angle of the cleaning jet 60 on the treadmill 1.

During operation of the cleaning device 20, an even stronger air flow 83 can arise due to the only slight gap between the cleaning head and the treadmill 1, since the overpressure created by the compressed air jets 101 in the region of the main opening 81 is forced even more, via the discharge opening 84 and not to be adapted to the ambient pressure by other means. In addition, dirt and spray water is even better already collected directly by the cleaning head 80.

• An der Hauptöffnung 81 ist eine Einrichtung 100 zur Zuführung von Druckluft 101 angebracht. Diese ist ein am Außenradius des Reinigungskopfes 80 angebrachter, die Hauptöffnung 81 umgebender, ringförmiger Hohlkörper mit in gleichen Abständen zueinander gebohrten Löchern als Luftzuführungsöffnungen 102 mit dem Durchmesser 0,8 mm. Die Löcher sind in einem Winkel von 30° relativ zur Ebene des Laufbands 1 gebohrt. Dieser Hohlkörper ist ein zu einem Ring gebogenes Rohr, dessen Enden miteinander luftdicht verschweißt sind und in welches Löcher als Luftzuführungsöffnungen sowie ein Anschlussloch zur Zuführung von Druckluft gebohrt sind. Zur Herstellung einer dieser Luftzuführungsöffnung wird zunächst das den Ring bildende Rohr durch eine Bohrung, die an der Außenseite des Rings ansetzt komplett durchbohrt, so dass durch eine Bohrung zwei Löcher in dem Rohrmantel entstehen. Das Austrittsloch an der Innenseite des Rings ist schräg nach unten auf den Ringmittelpunkt ausgerichtet. Der Grat an diesem Loch ist somit nicht auf der im Hohlraum des Rings liegenden Rohrfläche, sondern auf der Außenfläche. Dadurch kann der Grat sauber entfernt werden. Das andere, im Rohrquerschnitt gegenüberliegende Loch wird zugeschweißt. Auf diese Weise erhält man eine saubere Bohrung, welche als Luftzuführungsöffnung dienen kann. Würde ein Loch mit einem im Hohlraum des Rings liegenden Grat verwendet, könnten sich Unreinheiten in der Druckluft mit der Zeit an dem Grat festsetzen und das Loch würde nach einer gewissen Zeit verstopfen.
• Der Reinigungskopf weist zwei seitliche Eintrittsöffnungen 82 auf.
• Direkt über den Eintrittsöffnungen 82 ist als Einrichtung 120 zur Zuführung von Wasserstrahlen 121 im Inneren des Reinigungskopfes 80 ein hohler Ringkörper mit in gleichen Abständen zueinander gebohrten Löchern als Wasserstrahlöffnungen 122 mit dem Durchmesser 0,8 mm angebracht. Die Löcher sind vertikal nach oben und parallel zur Innenwand des Reinigungskopfes 80 gebohrt. Ein Wasseranschluss 123 ist an dem Ringkörper vorhanden.
• Über der Einrichtung 120 zur Zuführung von Wasserstrahlen 121 ist als Einrichtung 140 zur Zuführung von Druckluft 141 im Inneren des Reinigungskopfes 80 ein hohler Ringkörper mit in gleichen Abständen zueinander gebohrten Löchern als Luftzuführungsöffnungen 142 mit dem Durchmesser 0,8 mm angebracht. Die Löcher sind vertikal nach oben und parallel zur Innenwand des Reinigungskopfes 80 gebohrt. Ein Druckluftanschluss 143 ist an dem Ringkörper vorhanden.
• Im obersten Bereich der Zeichnung weist der Reinigungskopf 80 eine Biegung um 90° auf.
• Außerhalb des Reinigungskopfes 80 sind zwei gegenüberliegende Reinigungsdüsen 40 zur Erzeugung laminarer Hochdruckstrahlen 60 angebracht.

In FIG. 4 a further exemplary, inventive embodiment of the cleaning device 20 is shown. Shown is a view of the interior of the cleaning head 80 (diameter: 228 mm, distance to the treadmill 1, not drawn: 10 mm) and the components attached thereto:

• At the main opening 81, a device 100 for supplying compressed air 101 is attached. This is attached to the outer radius of the cleaning head 80, the main opening 81 surrounding annular hollow body with holes drilled at equal intervals to each other Air supply openings 102 with the diameter of 0.8 mm. The holes are drilled at an angle of 30 ° relative to the plane of the treadmill 1. This hollow body is a pipe bent into a ring, the ends of which are welded airtight to each other and in which holes are drilled as air supply openings and a connection hole for supplying compressed air. To produce one of these air supply opening, the pipe forming the ring is first completely pierced through a hole which attaches to the outside of the ring, so that two holes are formed in the pipe jacket through a hole. The exit hole on the inside of the ring is aligned obliquely down to the center of the ring. The ridge on this hole is therefore not on the lying in the cavity of the ring tube surface, but on the outer surface. This allows the burr to be removed cleanly. The other, in the pipe cross-section opposite hole is welded shut. In this way, you get a clean bore, which can serve as an air supply opening. If a hole were used with a ridge in the cavity of the ring, impurities in the compressed air could settle on the ridge over time and the hole would become clogged after some time.
• The cleaning head has two lateral inlet openings 82.
• Directly above the inlet openings 82 as a means 120 for supplying water jets 121 in the interior of the cleaning head 80, a hollow annular body with equally spaced holes drilled holes attached as water jet openings 122 with a diameter of 0.8 mm. The holes are drilled vertically upwards and parallel to the inner wall of the cleaning head 80. A water port 123 is provided on the ring body.
• Above the means 120 for supplying water jets 121 as a means 140 for supplying compressed air 141 inside the cleaning head 80 is a hollow Ring body mounted with equally spaced holes drilled as air supply openings 142 with a diameter of 0.8 mm. The holes are drilled vertically upwards and parallel to the inner wall of the cleaning head 80. A compressed air port 143 is provided on the ring body.
• In the upper part of the drawing, the cleaning head 80 has a bend of 90 °.
• Outside the cleaning head 80, two opposed cleaning nozzles 40 are mounted to produce laminar high pressure jets 60.

During operation of the cleaning device 20, the cleaning nozzles 40 each radiate a high-pressure jet 60 made of water at a pressure of 450 bar to a common impact point 61 from two different directions. The high pressure jets 61 clean the belt. Furthermore, compressed air 101 (shown by way of example only for two air supply openings 102, even if compressed air 101 flows out of all air supply openings 102) is fed via the air supply openings 102 into the annular body of the device 100 for supplying compressed air 101. The individual, resulting jets of compressed air 101 converge to the vertical center axis of the cleaning head 80 and together form an air curtain 103, which includes the resulting spray between the cleaning head 80 and the treadmill 1. The compressed air 101 is further deflected itself and then acts in the direction of the interior of the cleaning head 80. It results in a strong vertical updraft (only partially indicated by dashed arrows, an arrowhead does not mean the end of the air flow) inside the cleaning head 80 due to the Due to the small gap between the treadmill 1 and the main opening 81, the overpressure results in an airflow 83 in the direction of the discharge opening 84, which is strong enough, dirt and spray water to the discharge opening to transport. The splash water (exemplified by meandering, continuous lines originating at point of impact 61), which normally diverges along the plane of the treadmill 1, is blocked by the air curtain 103 and deflected vertically upward into the cleaning head 80. Water is supplied into the ring body of the water jet supply device 120. The resulting individual water jets 121 generate a flushing of the inner wall of the cleaning head 80. The water pressure used here is 5 bar. Compressed air is supplied to the annular body of the device 140 for supplying compressed air 141. The resulting individual compressed air jets 141 drive the water and the detached dirt particles in the direction of the discharge opening 84 forward.

Cleaning by using more than one high pressure jet 60 is more effective than cleaning by only one jet. The high-pressure jets 60 penetrate from different directions into pores and depressions of the belt 1, whereby a more thorough cleaning is achieved. The embodiment of the device 100 for supplying compressed air 101 as a hollow annular body with air supply openings 102 allows the emergence of an air curtain enclosing the spray water 103. By the devices 120 and 140 shown here for supplying water jets 121 and 141, the interior and the inner walls of Cleaning head 80 kept clean.

In FIG. 5 By way of example, a cleaning device 20 according to the invention is shown which, unlike the cleaning devices 20 shown above, has three cleaning nozzles 40 (only two are visible, one is hidden) for producing laminar high-pressure jets 60 and three inlet openings 82 (only one is visible, two are hidden) in FIG Cleaning head 80 has. One is aligned against the running direction of the treadmill 1 and the others two are aligned with each other across the treadmill 1. The impact points 61 of the three high-pressure jets 61 are approximately at the tangential point of the belt 1 and the roller 21 and they are at a distance of 2 mm from each other in a line along the running direction of the treadmill 1. In addition, a support means 180 with an integrated therein Collection channel system shown. In contrast to the cleaning devices 20 shown above, the cleaning device 20 shown here is equipped with a dryer unit 160. This has four air nozzles 161 along the running direction of the treadmill 1, which are aligned offset from two different directions or with two different angles of incidence on the treadmill 1.

In operation of the cleaning device 20, the air nozzles 161 radiate conical shaped air jets 162 onto the treadmill 1 and thus dry the just cleaned and thus wet area of the treadmill 1. The angle enclosed by the jets of air and the surface of the treadmill 1 is 30 °. The jets are generated by compressed air at a pressure of 4 bar. The collected and derived by the cleaning head 82 spray and rinse water and the detached dirt particles are washed out of the collection channel system using rinsing jets and scrapers. The cleaning device is moved during cleaning transverse to the running direction of the belt 1 along the carrier device 180 via a motor.

The described alignment of the high pressure jets 60 allows the concentration of available beam energy to a small area. The downstream of the cleaning components dryer unit ensures rapid drying of the cleaned treadmill 1. The arrangement of the air nozzles 161 in along the strip running is generated in the direction of wide air curtain.

In FIG. 6 For example, an inventive cleaning device 20 is shown, in contrast to the cleaning device of FIG. 5 has no inlet openings 82 in the cleaning head 80. The main opening 82 therefore has a greater distance from the treadmill 1, so that the high-pressure jets 60 generated by the cleaning nozzles 40 can impinge unhindered on the treadmill 1. Also, there is no means 100 for supplying compressed air 101. Furthermore, the dryer unit 162 is equipped with six mutually offset air nozzles 161.

The spray water and the detached dirt particles are sucked in this embodiment exclusively by a suction - the air flow 83 - in the cleaning head 80, which also attracts air from the vicinity of the main opening 81 (indicated by a dashed framed truncated cone).

This simplified design is a less expensive variant of the cleaning device 20. The use of six instead of four air nozzles 161 in the dryer unit 160 allows even faster drying of the just cleaned area of the treadmill 1. However, the new purchase of a vacuum pump may be necessary.

In FIG. 7 it is shown which angles W1 and W2 can be adjusted for alignment. Three high pressure jet nozzles 40 are shown, each radiating a high pressure jet 60 at three different points of incidence 61. Dashed lines are on the one hand, the running direction 11 of the treadmill (with arrow) and the projections 62 of the high-pressure jets drawn on the treadmill 1. W1 is in each case the angle 63 between running direction and projection, W2 is in each case the angle 64 between the running belt surface and the high-pressure jet.

With the invention newly presented here it is possible for the first time to provide a cleaning device which, by virtue of the individual features but also by the interaction of the features, achieves a significant advance in e.g. the Trockensiebreinigung allows. For example, for the first time a continuous cleaning without an intermediate drying phase of the drying wire is possible. For example, the cleaning device achieved by the small area on which the cleaning rays on the treadmill in conjunction with the positionable near the treadmill cleaning head - possible through the inlet openings - a high cleaning effect at the same time effective removal - by the pressure - the dirt and in addition the treadmill quickly dries up through the drying unit - facilitated by the small area that is wetted. But not only the interaction, but also the use of only one or a few of these inventive features lift this cleaning device clearly from the prior art.

1. 1. Reinigungsvorrichtung (20) zur Reinigung des Laufbands (1) eines Trockensiebs in einer Papierherstellungsanlage (2) umfassend wenigstens eine Reinigungsdüse (40) zur Erzeugung eines Hochdruckstrahls (60) einer Flüssigkeit mit einem Auftreffpunkt (61) auf dem Laufband, wenigstens einen Reinigungskopf (80) mit einer Abführöffnung (84) und einer dem Laufband (1) zugewandten Hauptöffnung (81), wobei
   die Reinigungsdüse (40) außerhalb des Reinigungskopfes (80) angeordnet ist,
   dadurch gekennzeichnet, dass
   die Wand des Reinigungskopfes (80) wenigstens eine Eintrittsöffnung (82) aufweist und
   wenigstens eine Reinigungsdüse (40) so ausgerichtet ist, dass ein Hochdruckstrahl (60) aus der Reinigungsdüse (40) von außen durch eine der vorhandenen Eintrittsöffnungen (82) auf das Laufband (1) trifft.
2. 2. Reinigungsvorrichtung (20) nach Aspekt 1,
   dadurch gekennzeichnet, dass
   bei Vorhandensein von mehr als einer Reinigungsdüse (40) die Reinigungsdüsen (40) um den Reinigungskopf (80) herum verteilt sind und so ausgerichtet sind, dass die von den Reinigungsdüsen (40) erzeugten Hochdruckstrahlen (60) auf einen Bereich des Laufbands (1) treffen, der innerhalb der gedachten Projektion der Umrisslinie der Hauptöffnung (81) auf das Laufband (1) liegt.
3. 3. Reinigungsvorrichtung (20) nach einem der vorhergehenden Aspekte,
   dadurch gekennzeichnet, dass
   im Bereich von wenigstens einem Auftreffpunkt (61) wenigstens eines Hochdruckstrahls (60) auf dem Laufband wenigstens eine Einrichtung (100) zur Zuführung von Druckluft (101) angeordnet ist.
4. 4. Reinigungsvorrichtung (20) nach einem der vorhergehenden Aspekte,
   dadurch gekennzeichnet, dass
   innerhalb des Reinigungskopfes (80) eine Einrichtung (120) zur Zuführung von wenigstens einem Wasserstrahl (121) vorgesehen ist, wobei die erzeugten Wasserstrahlen (121) im Wesentlichen in eine Richtung hin zur Abführöffnung (84) ausgerichtet sind.
5. 5. Reinigungsvorrichtung (20) nach einem der vorhergehenden Aspekte,
   dadurch gekennzeichnet, dass
   innerhalb des Reinigungskopfes (80) eine Einrichtung (140) zur Zuführung von Druckluft (141) vorgesehen ist.
6. 6. Reinigungsvorrichtung (20) nach einem der vorhergehenden Aspekte,
   dadurch gekennzeichnet, dass
   die Reinigungsvorrichtung (20) eine in Laufrichtung des Laufbands (1) vom Reinigungskopf (80) beabstandete Trocknereinheit (160) aufweist.
7. 7. Verfahren zur Reinigung eines Laufbands (1) eines Trockensiebs in einer Papierherstellungsanlage mit einer Reinigungsvorrichtung (20), wobei die Reinigungsvorrichtung einen Reinigungskopf (80) aufweist, der einen Innenraum, eine Abführöffnung (84) und eine dem Laufband (1) zugewandte Hauptöffnung (81) aufweist, umfassend den Schritt
   • Bestrahlen des Laufbands (1) mit wenigstens einem Hochdruckstrahl (60) einer Flüssigkeit, der an einer Position außerhalb des Reinigungskopfes (80) von einer Reinigungsdüse (40) erzeugt wird
   dadurch gekennzeichnet, dass der Reinigungskopf (80) zusätzlich wenigstens eine Eintrittsöffnung (82) in der Wand des Reinigungskopfes (80) aufweist und wenigstens ein Hochdruckstrahl (60) durch eine der in dem Reinigungskopf (80) vorhandenen Eintrittsöffnungen (82) von außen auf das Laufband (1) strahlt.
8. 8. Verfahren zur Reinigung eines Laufbands (1) nach Aspekt 7,
   dadurch gekennzeichnet, dass
   beim Bestrahlen des Laufbands (1) mit mehr als einem Hochdruckstrahl (60) die Hochdruckstrahlen (60) aus verschiedenen Richtungen auf das Laufband (1) strahlen.
9. 9. Verfahren zur Reinigung eines Laufbands (1) nach einem der Aspekte 7 bis 8,
   dadurch gekennzeichnet, dass
   zusätzlich die für die Hochdruckstrahlen (60) vorgesehene Flüssigkeit erhitzt wird.
10. 10.Verfahren zur Reinigung eines Laufbands (1) nach einem
    der Aspekte 7 bis 9,
    dadurch gekennzeichnet, dass
    zusätzlich Druckluft (101) über eine Einrichtung (100) zur Zuführung von Druckluft im Bereich wenigstens eines Auftreffpunktes (61) zugeführt wird, so dass von der Laufbahn (1) abprallende Flüssigkeit durch die zugeführte Druckluft (101) in Richtung der Hauptöffnung (81) abgelenkt wird.
11. 11.Verfahren zur Reinigung eines Laufbands (1) nach Aspekt 10,
    dadurch gekennzeichnet, dass
    durch das Zuführen von Druckluft ein Überdruck im Bereich wenigstens eines Auftreffpunktes (61) erzeugt wird, wobei sich der Überdruck auch in den Innenraum des Reinigungskopfes (80) ausbreitet und einen Luftstrom (83) erzeugt, der die abprallende Flüssigkeit durch den Innenraum des Reinigungskopfes (80) abtransportiert.
12. 12.Verfahren zur Reinigung eines Laufbands (1) nach einem
    der Aspekte 7 bis 11,
    dadurch gekennzeichnet, dass
    zusätzlich wenigstens ein Wasserstrahl (121) innerhalb des Reinigungskopfes (80) erzeugt wird, der Schmutz und verbrauchtes Wasser abtransportiert.
13. 13.Verfahren zur Reinigung eines Laufbands (1) nach einem
    der Aspekte 7 bis 12,
    dadurch gekennzeichnet, dass
    zusätzlich Druckluft (141) innerhalb des Reinigungskopfes (80) zugeführt wird, die Schmutz und verbrauchtes Wasser abtransportiert.
14. 14.Verfahren zur Reinigung eines Laufbands (1) nach Aspekt 13,
    dadurch gekennzeichnet, dass
    die Druckluft (141) derart im Inneren des Reinigungskopfes (80) zugeführt wird, dass ein Luftwirbel entsteht.
15. 15.Verfahren zur Reinigung eines Laufbands (1) nach einem der Aspekte 7 bis 14,
    dadurch gekennzeichnet, dass
    zusätzlich das Laufband (1) nach dem Bestrahlen des Laufbands (1) mit wenigstens einem Hochdruckstrahl (60) einer Flüssigkeit durch eine in Laufrichtung nachgeordnete Trocknereinheit (160) getrocknet wird.

Bezugszeichen 1 Laufband 2 Papierherstellungsanlage 11 Laufrichtung 20 Reinigungsvorrichtung 21 Rolle 40 Reinigungsdüse 60 Hochdruckstrahl 61 Auftreffpunkt 62 Projektion des Hochdruckstrahls auf die Laufbandfläche 63 W1 64 W2 71 Wärmetauscher 80 Reinigungskopf 81 Hauptöffnung 82 Eintrittsöffnung 83 Luftstrom 84 Abführöffnung 100 Einrichtung zur Zuführung von Druckluft 101 Druckluft 102 Luftzuführungsöffnung 103 Luftvorhang 120 Einrichtung zur Zuführung von Wasserstrahlen 121 Wasserstrahl 122 Wasserstrahlöffnung 123 Wasseranschluss 140 Einrichtung zur Zuführung von Druckluft 141 Druckluft 142 Luftzuführungsöffnung 143 Druckluftanschluss 160 Trocknereinheit 161 Luftdüse 162 Druckluftstrahl 180 Trägereinrichtung Further aspects of the invention:

1. A cleaning device (20) for cleaning the treadmill (1) of a dryer fabric in a papermaking machine (2) comprising at least one cleaning nozzle (40) for generating a high pressure jet (60) of liquid having a hitting point (61) on the treadmill, at least one cleaning head (80) having a discharge opening (84) and the treadmill (1) facing the main opening (81), wherein
   the cleaning nozzle (40) is arranged outside the cleaning head (80),
   characterized in that
   the wall of the cleaning head (80) has at least one inlet opening (82) and
   at least one cleaning nozzle (40) is aligned so that a high-pressure jet (60) from the cleaning nozzle (40) from the outside through one of the existing inlet openings (82) on the treadmill (1).
2. 2. Cleaning device (20) according to aspect 1,
   characterized in that
   in the presence of more than one cleaning nozzle (40), the cleaning nozzles (40) are distributed around the cleaning head (80) and aligned such that the high-pressure jets (60) generated by the cleaning nozzles (40) are applied to a region of the conveyor belt (1) meet within the imaginary projection of the outline of the main opening (81) on the treadmill (1).
3. 3. Cleaning device (20) according to one of the preceding aspects,
   characterized in that
   In the region of at least one impact point (61) of at least one high-pressure jet (60) on the treadmill at least one device (100) for supplying compressed air (101) is arranged.
4. 4. cleaning device (20) according to one of the preceding aspects,
   characterized in that
   a device (120) for supplying at least one water jet (121) is provided within the cleaning head (80), wherein the generated water jets (121) are oriented substantially in a direction towards the discharge opening (84).
5. 5. Cleaning device (20) according to one of the preceding aspects,
   characterized in that
   within the cleaning head (80) means (140) for supplying compressed air (141) is provided.
6. 6. Cleaning device (20) according to one of the preceding aspects,
   characterized in that
   the cleaning device (20) has a drying unit (160) spaced apart from the cleaning head (80) in the running direction of the moving belt (1).
7. A method of cleaning a treadmill (1) of a dryer fabric in a papermaking machine having a cleaning device (20), the cleaning device comprising a cleaning head (80) having an interior space, a discharge opening (84) and a main opening facing the treadmill (1) (81) comprising the step
   • Irradiating the treadmill (1) with at least one high-pressure jet (60) of a liquid which is generated at a position outside the cleaning head (80) by a cleaning nozzle (40)
   characterized in that the cleaning head (80) additionally has at least one inlet opening (82) in the wall of the cleaning head (80) and at least one high pressure jet (60) through one of the in the cleaning head (80) existing inlet openings (82) from the outside to the Treadmill (1) shines.
8. 8. A method for cleaning a treadmill (1) according to aspect 7,
   characterized in that
   when irradiating the treadmill (1) with more than one high-pressure jet (60) the high-pressure jets (60) from different directions on the treadmill (1) radiate.
9. 9. A method of cleaning a treadmill (1) according to any of Aspects 7 to 8,
   characterized in that
   in addition, the liquid intended for the high-pressure jets (60) is heated.
10. 10.Method for cleaning a treadmill (1) after a
    aspects 7 to 9,
    characterized in that
    additionally compressed air (101) is supplied via a device (100) for supplying compressed air in the region of at least one impact point (61), so that liquid rebounding from the raceway (1) is conveyed by the supplied compressed air (101) in the direction of the main opening (81). is distracted.
11. 11. Method for cleaning a treadmill (1) according to aspect 10,
    characterized in that
    by the supply of compressed air, an overpressure in the region of at least one impact point (61) is generated, wherein the overpressure also in the interior of the cleaning head (80) propagates and generates an air flow (83), the rebounding liquid through the interior of the cleaning head ( 80) transported away.
12. 12.Method for cleaning a treadmill (1) after a
    aspects 7 to 11,
    characterized in that
    In addition, at least one water jet (121) within the cleaning head (80) is generated, which removes dirt and used water.
13. 13.Method for cleaning a treadmill (1) after a
    aspects 7 to 12,
    characterized in that
    additional compressed air (141) within the Cleaning head (80) is supplied, which removes dirt and used water.
14. 14. Method for cleaning a treadmill (1) according to aspect 13,
    characterized in that
    the compressed air (141) is supplied in such a way in the interior of the cleaning head (80), that an air vortex arises.
15. 15. Method for cleaning a treadmill (1) according to one of aspects 7 to 14,
    characterized in that
    in addition, the treadmill (1) after the irradiation of the treadmill (1) with at least one high-pressure jet (60) of a liquid by a downstream drying unit (160) is dried.

reference numeral 1 treadmill 2 Papermaking plant 11 direction 20 cleaning device 21 role 40 cleaning nozzle 60 High pressure jet 61 of impact 62 Projection of the high-pressure jet onto the tread surface 63 W1 64 W2 71 heat exchangers 80 cleaning head 81 main opening 82 inlet opening 83 airflow 84 discharge opening 100 Device for supplying compressed air 101 compressed air 102 Air supply port 103 air curtain 120 Device for supplying water jets 121 waterjet 122 Water jet opening 123 mains water supply 140 Device for supplying compressed air 141 compressed air 142 Air supply port 143 Compressed air connection 160 dryer unit 161 air nozzle 162 Compressed air jet 180 support means

Claims (15)

A cleaning device (20) for cleaning a surface (1) comprising at least one cleaning nozzle (40) for generating a high - pressure jet (60) of a liquid having a point of impact (61) on the surface, at least one cleaning head (80) with a discharge opening (84) and one of the surface (1) facing the main opening (81), and a first means (100) for supplying compressed air (101) in the region of at least one impact point (61) at least one high-pressure jet (60) on the surface,
in the
the first means (100) for supplying compressed air is adapted to cause a deflection of spray water from the surface in the direction of the main opening (81) and an air flow (83) for pushing the spray to the discharge opening (84). A cleaning device (20) according to claim 1, wherein
the first device (100) for supplying compressed air generates an overpressure in the main opening (81). Cleaning device (20) according to claim 1 or 2, in which
the surface is the treadmill (1) of a dryer fabric in a papermaking machine (2). Cleaning device (20) according to one of the preceding claims, in which
the cleaning device (20) has a drying unit (160) spaced apart from the cleaning head (80) in the running direction of the surface. Cleaning device (20) according to one of the preceding claims, in which
the first device (100) for supplying compressed air has an annular hollow body which is arranged on the main opening (81), and / or
a second device (140) is provided for supplying compressed air, which has an annular hollow body which is arranged within the cleaning head. A cleaning device (20) according to any one of the preceding claims, wherein the first means (100) for supplying compressed air comprises a first channel for supplying compressed air to the main opening (81) of the cleaning head (80) and the second means (140) for supplying Compressed air has a second channel for supplying compressed air within the cleaning head (80), and
the second channel for supplying compressed air is preferably designed to generate an air vortex within the cleaning head (80). Cleaning device (20) according to one of the preceding claims, in which
a device (120) for supplying water jets (121) is provided within the cleaning head (80), wherein the generated water jets (121) are oriented substantially in a direction towards the discharge opening (84). A method of cleaning a treadmill (1) of a dryer fabric in a papermaking machine having a cleaning device (20), the cleaning device comprising a cleaning head (80) having an interior space, a discharge opening (84) and a main opening (81) facing the treadmill (81) ) comprising the step Irradiating the treadmill (1) with at least one high pressure jet (60) of a liquid generated by a cleaning nozzle (40), - Supplying compressed air (101) via a device (100) for supplying compressed air in the region of at least one impact point (61) of the high pressure jet (60) of a Liquid, so that from the raceway (1) rebounding liquid is deflected by the supplied compressed air (101) in the direction of the main opening (81). Method according to claim 8, with the further step: - Generating an overpressure in the region of at least one impact point (61) by supplying compressed air, wherein the overpressure also in the interior of the cleaning head (80) propagates and generates an air flow (83), which the rebounding liquid through the interior of the cleaning head (80) transported to the discharge opening (84). The method of claim 8 or 9, further comprising the step
Heating the liquid intended for the high-pressure jets (60). Method according to one of claims 8 to 10, with the further step
Generating at least one jet of water (121) within the cleaning head (80) that removes dirt and depleted water. Method according to one of claims 8 to 11, with the further step
Supplying compressed air (141) within the cleaning head (80), which removes dirt and used water in the direction of the discharge opening (84),
wherein the supply of compressed air (141) in the interior of the cleaning head (80) preferably takes place in such a way that an air vortex arises. A method of cleaning a treadmill (1) according to any one of claims 8 to 12, comprising the further step of drying the treadmill (1) after irradiating the treadmill (1) with at least one high pressure jet (60) Liquid through a downstream in the direction of drying unit (160). A method of cleaning a treadmill (1) according to any one of claims 8 to 13, wherein
a negative pressure source is provided at the discharge opening (84), and / or
a device for supplying the compressed air is designed so that a compressed air ring is formed. A method of making paper in a papermaking machine having a treadmill of a dryer fabric wherein the treadmill is cleaned by the method of any of claims 8 to 14.

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