Method for cleaning and removing a residual fraction of sealants and / or adhesives in mixing VATS following a production and filling process

Abstract

The present invention relates to a method for cleaning and removing a residual fraction of sealants and / or adhesives from mixing vats following a production and filling process, comprising the steps of mechanically brushing the mixing vat by means of an axially rotating first brush (10), mechanically brushing an outlet mouth provided on the mixing vat by means of an axially rotating second brush (11), wherein, during the mechanical brushing of the mixing vat, an open upper side of the mixing vat is oriented downward. The invention also relates to a device for cleaning and removing a residual fraction of sealants and / or adhesives from mixing vats following a production and filling process.

Description

[0001] METHOD FOR CLEANING AND REMOVING A RESIDUAL FRACTION OF SEALANTS AND / OR ADHESIVES IN MIXING VATS FOLLOWING A PRODUCTION AND FILLING PROCESS

[0002] TECHNICAL FIELD

[0003] The invention relates to a method and a device for cleaning and removing a residual fraction of sealants and / or adhesives in mixing vats following a production and filling process.

[0004] PRIOR ART

[0005] A method for cleaning and removing a residual fraction of sealants and / or adhesives in mixing vats following a production and filling process is known per se. A known method comprises a completely manual cleaning of the mixing vat, wherein the residual fractions are removed from the mixing vat by means of a hand scraper and / or brush. This known method involves some problems and drawbacks.

[0006] One of the disadvantages concerns the residual fractions of sealants and / or adhesives to be removed. Such residual fractions include, among other things, the properties that they are agents and / or substances with a high tack, high viscosity and a tendency to adhere to surfaces by means of adhesion. This complicates the cleaning of mixing vats and, in particular, complete manual cleaning since such residual fractions stick to the mixing vats with a certain tack value. As a result, a certain physical force must be exerted to scrape off the residual fractions.

[0007] An additional disadvantage is that with fully manual scraping only a small partial surface is scraped off per manual scraping movement. As a result, a considerable number of manual scraping movements are required to clean the entire surface of a mixing vat. This results in the fact that the complete manual scraping is a labor-intensive and time-consuming process.

[0008] An additional disadvantage is that the sealants and / or adhesives, cure after a certain period of time, when exposed to atmospheric humidity. It is therefore of considerable importance that cleaning of the mixing vats takes place before the residual fractions have cured. This is a problem that the known method cannot avoid due to the time-consuming manual scraping. There is a need for a method in which cleaning proceeds sufficiently quickly to avoid curing as much as possible.

[0009] An additional disadvantage of the known method is that manual scraping is extremely physically demanding for a worker. The worker has to reach over the edge of the mixing vat to remove the residual fractions in an extremely unnatural position. An additional disadvantage of the known method is that manual scraping requires a considerable amount of solvent. As a result, there is a health risk for the worker when exposed to such amounts of solvent, as well as an economic disadvantage due to the frequent use of solvent.

[0010] An improved method is described in EP4205869. In this method, a large number of steps are performed in an automated manner. The residual fraction is mechanically scraped up and away by means of a scraper arm and the mixing vat is also brushed by means of axially rotating brushes. A disadvantage of this known method is that the scraped-away residual fraction must be removed from the mixing vat via an open upper side. This is a difficult and time-consuming step, wherein pieces of the scraped-loose sealants and / or adhesives repeatedly fall back into the mixing vat. It is also disadvantageous that solvents which are used during the cleaning of the mixing vat are drained via the outlet mouth of the mixing vat. However, the solvents can carry along a part of the residual fraction through the outlet mouth, as a result of which there is a risk that the outlet mouth clogs repeatedly and must be cleaned.

[0011] The present invention aims to find at least a solution for some of the above-mentioned problems or disadvantages.

[0012] SUMMARY OF THE INVENTION

[0013] In a first aspect, the present invention relates to a method according to claim 1.

[0014] The open upper side of the mixing vat being oriented downward is particularly advantageous because as a result the residual fraction immediately falls out of the mixing vat during the mechanical brushing of the bottom and the inner wall. This prevents the outlet mouth of the mixing vat from becoming clogged again by part of the residual fraction that is discharged through the outlet mouth together with solvents, for example. The method can also be performed much faster because the residual fraction does not have to be scooped out of the mixing vat via the openupper side. The cleaning of and the removing of the residual fraction from the mixing vat can be performed completely mechanically.

[0015] Preferred embodiments of the device are shown in claims 2 to 9.

[0016] In a second aspect, the present invention relates to a device according to claim 10.

[0017] This device is particularly advantageous because the mixing vat can be placed over the first brush by means of the robotic arm with the open upper side of the mixing vat downward. As a result, the bottom and the inner wall of the mixing vat can be brushed completely mechanically and the residual fraction will fall out of the mixing vat automatically. The cleaning of the mixing vat can be performed faster by means of the device since the residual fraction will fall out of the mixing vat by gravity. It is not necessary to scoop the residual fraction out of the mixing vat in an additional step. It is also advantageous that as a result the outlet mouth of the mixing vat cannot clog again. The device allows cleaning the mixing vat completely mechanically and removing the residual fraction from the mixing vat completely automatically.

[0018] Preferred embodiments of the method are described in the dependent claims 11 to 15.

[0019] DESCRIPTION OF THE FIGURES

[0020] Figure 1 shows a plan view of a device according to an embodiment of the present invention.

[0021] Figure 2 shows a perspective view of the robotic arm in Figure 1.

[0022] Figure 3 shows a top view of the gripper on the robotic arm in Figure 2.

[0023] Figure 4 shows a side view of a detail of the gripper in Figure 2.

[0024] Figure 5 shows a detail of the mixing vat in Figure 1.

[0025] Figure 6 shows a top view of a detail of the gripper in Figure 2.

[0026] Figure 7 shows a perspective view of a detail of the device in Figure 1.Figure 8 shows a perspective view of a clamping and tilting device according to an embodiment of the present invention.

[0027] Figure 9 shows a detail of the clamping and tilting device in Figure 8.

[0028] DETAILED DESCRIPTION

[0029] Unless defined otherwise, all terms used in the description of the invention, including technical and scientific terms, have the meaning as commonly understood by a person skilled in the technical field of the invention. For a better assessment of the description of the invention, the following terms are explicitly explained.

[0030] As used in this document, the articles "a", "an" and "the" refer to both the singular and the plural, unless the context clearly dictates otherwise. For example, "a segment" means one or more than one segment.

[0031] The terms "comprise," "comprising," "consist of," "consisting of," "provided with," "include," "including," "contain," "containing," are synonyms and are inclusive or open terms that indicate the presence of what follows, and which do not exclude or prevent the presence of other components, characteristics, elements, members, steps, as known from or disclosed in the prior art.

[0032] The citation of numerical ranges by their end points includes all integers, fractions, and / or real numbers between the end points, including the end points themselves.

[0033] Sealants and / or adhesives in the context of this document means sealants or adhesives or a combination of both.

[0034] A mixing vat preferably comprises a cylindrical tub. The cylindrical tub comprises a bottom, an inner wall, and an upper side, wherein the entire upper side is open. Such a mixing vat is suitable for mixing sealants and / or adhesives during a production and filling process. The mixing vat is fitted with an outlet mouth at the bottom. It is conventional to drain a mixing vat through this outlet mouth. Following a production and filling process, the mixing vats are cleaned since residual fractions of the sealants and / or adhesives remain on the inner wall of the mixing vat. Mixing vats are preferably reused for a subsequent production and filling process and it is importantthat the mixing vats are completely cleaned. Moreover, sealants and / or adhesives cure upon exposure to moisture, such as for example the atmospheric humidity in ambient air, after a certain period of time. It is therefore important that the mixing vats are cleaned properly and quickly.

[0035] The outlet mouth has a circular cross-section, preferably with a maximum diameter of 85 mm, more preferably a maximum diameter of 80 mm, even more preferably a maximum diameter of 75 mm and even more preferably a maximum diameter of 70 mm.

[0036] The outlet mouth preferably comprises a shut-off tap or shut-off valve. The shut-off tap or shut-off valve is preferably removable for easy cleaning of the outlet mouth.

[0037] In a first aspect, the invention relates to a method for cleaning and removing a residual fraction of sealants and / or adhesives in mixing vats following a production and filling process.

[0038] The method comprises the steps of:

[0039] - the mechanical brushing of a bottom and inner wall of the mixing vat by means of an axially rotating first brush;

[0040] - the mechanical brushing of an outlet mouth provided on the mixing vat by means of an axially rotating second brush.

[0041] It is clear that the mechanical brushing of the bottom and inner wall and the mechanical brushing of the outlet mouth can be interchanged. Preferably, the bottom and the inner wall are brushed first. This is advantageous because as a result the inner wall at the level of the outlet mouth is already cleaned and free, as a result of which the mechanical brushing of the outlet mouth is simpler. Optionally, the bottom, the inner wall, and the outlet mouth can be brushed simultaneously.

[0042] In a preferred embodiment, the first brush possesses one or more of following characteristics: The first brush comprises bristles and a core. The core is made of wood, plastic or another suitable material. The first brush is cylindrical or conical. The bristles are stuck in the core. The core comprises a recess for placement of a shaft for rotating the brush. The core is preferably built up of discs. The first brush has a diameter of at least 300 mm, preferably at least 350 mm and more preferably at least 375 mm. The first brush comprises two end faces and a lateral surface.Preferably, bristles are present both on the lateral surface and on at least one end face of the cylindrical shape, as a result of which brushing can take place simultaneously both with a lateral surface of the cylindrical shape and with the said end face. This is particularly advantageous for the simultaneous brushing of the bottom and the inner wall of the mixing vat. The lateral surface of the first brush is covered with bristles over a distance of at least 300 mm, preferably at least 325 mm, more preferably at least 350 mm, even more preferably at least 375 mm, and even still more preferably at least 400 mm. The distance is measured transverse to an end face of the first brush. If bristles are present on at least one end face of the cylindrical shape, the distance is measured from the at least one end face. The lateral surface of the first brush is preferably filled with at least 6 bristles per cm2, more preferably at least 7 bristles, even more preferably at least 8 bristles and even more preferably at least 9 bristles. The bristles are preferably made of steel or stainless steel. The bristles preferably have a tensile strength of at least 2200 N / mm2and at most 2900 N / mm2. As a result, the bristles are sufficiently firm and wear-resistant. Preferably, the bristles are twisted bristles, wherein the bristles are bundled per 2 to 100 bristles, preferably per 10 to 50 bristles. The twisted bristles preferably fan out in bundles. The twisted bristles preferably have a diameter of at least 10 mm at a free end, more preferably at least 15 mm and even more preferably at least 20 mm. This is advantageous because it ensures that the twisted bristles are sufficiently stiff, so that the bristles do not lie flat when brushing the mixing vat and also have a large contact surface. The first brush is preferably rotated at a rotational speed between 200 revolutions per minute and 800 revolutions per minute, more preferably between 300 revolutions per minute and 700 revolutions per minute, even more preferably between 400 revolutions per minute and 600 revolutions per minute and even more preferably between 450 revolutions per minute and 550 revolutions per minute.

[0043] In the context of this description, by a cylindrical brush is meant a brush body (core) that is built up around its own axis of rotation, wherein the bristles extend over (at least a part of) the circumference of the brush body, away from the axis of rotation. The own axis of rotation thus runs through the brush body.

[0044] In an embodiment, the first brush is substantially cylindrical. In the context of this description, this means that the largest part of the brush, and in particular the part intended for cleaning the inner wall of the mixing vat, exhibits a substantially constant diameter over its length.In a further or alternative embodiment, the first brush comprises, at at least one axial end, a brush head having a different shape, wherein said brush head is preferably of conical or substantially hemispherical configuration. This brush head forms an integral part of the first brush and is suitable for cleaning the bottom and the transition zones in the mixing vat, such as the transition between the bottom and the inner wall, without detracting from the cylindrical character of the brush over the remaining part of its length.

[0045] In an embodiment, the first brush is built up of a stack of discs which are mounted coaxially on the axis of rotation of the brush. A part of these discs forms the cylindrical part of the brush, while one or more discs at an end of the stack have a smaller diameter and together form the brush head. Due to this construction, the brush can locally assume a conical or hemispherical shape, while the brush as a whole remains mainly cylindrical.

[0046] The first brush is suitable for pressing against the inner wall and the bottom of the mixing vat under a controlled brush pressure. In an embodiment, the brush pressure of the first brush lies between 30 kg and 120 kg, preferably between 40 kg and 100 kg, more preferably between 50 kg and 80 kg. Applying such a brush pressure is particularly advantageous for loosening and removing high-viscosity and strongly adhesive sealants and / or adhesives, which are removed insufficiently at lower mechanical load. At the same time, the adjustability of the brush pressure allows to limit wear of the brush and damage to the mixing vat.

[0047] In a preferred embodiment, the second brush possesses one or more of the following characteristics: The second brush is cylindrical. The second brush preferably has a diameter of at least 80 mm, more preferably at least 82.5 mm, and even more preferably at least 85 mm. The second brush comprises two end faces and a lateral surface. The cylindrical brush comprises, on its lateral surface, bristles with a diameter between 0.15 mm and 0.35 mm. The lateral surface of the cylindrical brush is covered with bristles over a distance of at least 100 mm, preferably at least 120 mm, more preferably at least 130 mm, even more preferably at least 140 mm and even more preferably at least 150 mm. The distance is measured transverse to an end face of the cylindrical brush. The lateral surface of the cylindrical brush is preferably filled with at least 6 bristles per cm2, more preferably at least 7 bristles, even more preferably at least 8 bristles and even more preferably at least 9 bristles. The bristles are preferably wavy. The wavy bristles are advantageous for obtaining asufficient stiffness, as a result of which the bristles do not flatten during the mechanical brushing of the outlet mouth. The bristles are preferably made of steel or stainless steel. The bristles preferably have a tensile strength of at least 2200 N / mm2and at most 2900 N / mm2. As a result, the bristles are sufficiently strong and wear-resistant for removing sealants and / or adhesives from the outlet mouth. The bristles preferably form a spiral on the lateral surface of the second brush. This is advantageous for displacing the residual fraction out of the outlet mouth. The at least 6 bristles per cm2in this case concerns the zone where the spiral is present. The second brush comprises on one side a shaft transverse to an end face for driving the second brush. The second brush is preferably rotated at a rotational speed between 200 revolutions per minute and 800 revolutions per minute, more preferably between 300 revolutions per minute and 700 revolutions per minute, even more preferably between 400 revolutions per minute and 600 revolutions per minute and even more preferably between 450 revolutions per minute and 550 revolutions per minute. The second brush is suitable for cleaning the outlet mouth of the mixing vat.

[0048] In an embodiment, the second brush has a smaller diameter than the first brush, for example at least 1.5 times smaller, preferably at least 2 times smaller, preferably at least 2.5 times smaller. In another or further embodiment, the second brush has a smaller diameter than the first brush, for example between 1.5 and 5 times smaller, preferably between 2 and 5 times smaller, preferably between 2.5 and 5 times smaller.

[0049] For optimal operation, the rotation axis of the second brush should preferably be perpendicular to the outlet mouth of the mixing vat being cleaned. The outlet mouth of the mixing vat can be arranged obliquely or perpendicular to the wall of the mixing vat. According to an embodiment, the axis of rotation of the second brush is perpendicular to the axis of rotation of the first brush. This orthogonal arrangement allows that the first brush cleans the bottom and the inner wall, while the second brush can reach deep into the outlet mouth. The perpendicular configuration further promotes a compact positioning of the cleaning system. As a result, residual fractions in the outlet mouth are removed more efficiently.

[0050] Because the brushing is performed mechanically, cleaning is performed faster, as a result of which sealants and / or adhesives get less time to adhere to the mixing vat. If solvent is used, less solvent can be used as a result and in that case the solvent can be reused multiple times.According to a preferred embodiment, during the mechanical brushing of the mixing vat, an open upper side of the mixing vat is oriented downward. The mixing vat is oriented with the open upper side downward both during the mechanical brushing of the bottom and the inner wall and the outlet mouth. The mixing vat is oriented with the open upper side downward before the mechanical brushing and is oriented with the open upper side upward after the cleaning has ended. Preferably, the mixing vat is turned mechanically. This is advantageous for the safety of an operator.

[0051] The open upper side of the mixing vat being oriented downward is particularly advantageous because as a result the residual fraction immediately falls out of the mixing vat during the mechanical brushing of the bottom and the inner wall. This prevents the outlet mouth of the mixing vat from becoming clogged again by part of the residual fraction that is discharged through the outlet mouth together with solvents, for example. The method can also be performed much faster because the residual fraction does not have to be scooped out of the mixing vat via the open upper side. The cleaning of and the removing of the residual fraction from the mixing vat can be performed completely mechanically.

[0052] In an embodiment, a height-adjustable axially rotating shaft is used during the mechanical brushing of the bottom and inner wall of the mixing vat, which rotating shaft is provided with the first brush, such that the height of the first brush can be adjusted relative to the height of a residual fraction in the mixing vat. An advantage of such an embodiment is that the height of the first brush can be changed in a simple manner without the mechanical brushing of the mixing vat having to be stopped.

[0053] In an embodiment, during the mechanical brushing of the bottom and the inner wall of the mixing vat, the surface is brushed in a circular movement along the circumference of the mixing vat by means of the axially rotating first brush. In a further embodiment, the first brush rotates according to a planetary movement, wherein the first brush rotates both about its own axis and about a central, optionally height-adjustable, rotating shaft.

[0054] A planetary movement entails that an object, in the case of the present invention a brush, rotates about its own axis as well as rotating about another object, in the case of the present invention a central axis.According to a preferred embodiment, the first brush is sprayed with solvent during the mechanical brushing of the mixing vat. This is preferably done with one or more spray nozzles which are directed at the first brush. The solvent is suitable for dissolving the sealants and / or adhesives. The spraying of the first brush is advantageous for carrying away brushed-loose sealants and / or adhesives from the first brush. The spraying of the first brush is additionally advantageous for the cooling of the first brush.

[0055] In a preferred embodiment, the solvent comprises methoxypropoxypropanol, preferably in a concentration of 20-70%. Preferably, the solvent comprises methoxypropoxypropanol and a dearomatized organic solvent, in a ratio of 2: 1-1:2. A non-limiting example of a dearomatized organic solvent is Exxsol D100. Preferably, the solvent is used between 18°C and 22°C.

[0056] In a preferred embodiment, during and preferably after the mechanical brushing of the mixing vat, the bottom and the inner wall of the mixing vat are sprayed with solvent. Optionally, also before the mechanical brushing, the bottom and the inner wall are sprayed with solvent. The solvent is preferably sprayed onto the bottom and inner wall by means of one or more spray nozzles. The solvent is preferably as in a previously described embodiment. The solvent is preferably identical to solvent used for the spraying of the first brush.

[0057] This embodiment is advantageous for the softening of the residual fraction in the mixing vat so that the residual fraction comes loose from the bottom and the inner wall of the mixing vat more simply during the mechanical brushing. It is additionally advantageous that the open upper side of the mixing vat is oriented downward, so that the solvent runs out of the mixing vat automatically and so that loosened residual fraction falls out of the mixing vat.

[0058] In a further embodiment, the mixing vat is dried after the spraying with solvent of the bottom and the inner wall of the mixing vat. Herein, an airflow is directed onto the bottom and onto the inner wall. The airflow on the inner wall makes an angle of 45° ± 15° with the inner wall. The airflow on the inner wall is directed toward the open upper side. The air in the airflow is either heated or not. This embodiment is advantageous for removing residual solvent in the mixing vat. As a result, the mixing vat is immediately reusable for the production and filling process after the cleaning. An airflow that is directed toward the open upper side is advantageous becausesolvent in combination with gravity can be blown out of the mixing vat even more efficiently. This means that during the drying, the mixing vat is preferably still oriented with the open upper side downward.

[0059] In a preferred embodiment, the second brush is sprayed with solvent during the mechanical brushing of the outlet mouth. This is preferably done with one or more spray nozzles that are directed at the second brush. The solvent is suitable for dissolving the sealants and / or adhesives. The spraying of the second brush is advantageous for carrying away brushed-loose sealants and / or adhesives from the second brush. The spraying of the second brush is additionally advantageous for the cooling of the second brush. The solvent is preferably as in a previously described embodiment. The solvent is preferably identical to solvent used for the spraying of the first brush.

[0060] According to a preferred embodiment, the solvent is collected on a belt filter during the mechanical brushing. The belt filter is positioned under the mixing vat. The belt filter comprises a filter cloth. The belt filter comprises a collection tank under the filter cloth for collecting the solvent. The residual fraction of sealants and / or adhesives remains on the filter cloth and the solvent penetrates through the filter cloth. In this way, the recycled solvent is pure enough to be used during 10-1000 cleaning processes.

[0061] According to a further embodiment, the solvent from the collection tank is reused for the spraying. The solvent is pumped from the collection tank to the spray nozzles. The solvent is reused for the spraying of the first brush, the spraying of the second brush, the spraying of the bottom and the inner wall of the mixing vat, or any combination of the foregoing. Preferably, the solvent is reused for the spraying of the bottom and the inner wall of the mixing vat. This is advantageous for limiting consumption of solvent.

[0062] According to a preferred embodiment, the mixing vat is lifted by means of a clamping and tilting device before the mechanical brushing and subsequently turned upside down. This is advantageous because as a result an operator does not have to perform manual operations to turn the mixing vat over. Mixing vats are usually heavy, metal vats. Having to turn such a mixing vat manually would entail great risks.It is clear that the same clamping and tilting device is preferably used to turn the mixing vat with the open upper side upward again after the cleaning. This can, but does not have to be the same clamping and tilting device. Preferably, this is a second clamping and tilting device, so that during the turning of a cleaned mixing vat, a next mixing vat can already be turned upside down for the cleaning. As a result, the method proceeds faster.

[0063] According to a preferred embodiment, the mixing vat is placed upside down on a cart after the cleaning and removing of the residual fraction, after which the mixing vat is overhauled. This embodiment is advantageous for repairing mixing vats that are damaged. An example is the replacement of wheels under the mixing vat.

[0064] During the mechanical cleaning, the mixing vat preferably remains in a fixed horizontal position relative to the first brush. The vat is then not displaced horizontally or moved over a trajectory during the brushing. The only movements of the mixing vat that can preferably take place during the cleaning are any rotational movement of the mixing vat and / or optionally a controlled vertical displacement of the vat in height. This configuration ensures a stable and reproducible contact between brush and inner wall and limits unwanted shifts of the heavy mixing vat during the cleaning.

[0065] Mixing vats which are used for the processing of sealants and adhesives exhibit a considerable own weight in practice. Such mixing vats can be single-walled or doublewalled, wherein in double-walled mixing vats a cooling space can be provided in the lateral surface. The empty weight of such industrial mixing vats is typically at least 400 kg, or even at least 600 kg. According to a preferred embodiment, the method cleans mixing vats with an empty weight situated between 400 kg and 1,000 kg, preferably between 600 kg and 800 kg. Due to this considerable weight, a stable and controlled support is preferred during the cleaning, so that unwanted shifts, deflection or deformation of the vat are avoided.

[0066] The considerable weight of industrial mixing vats, in combination with the brush pressure exerted during the cleaning, places increased demands on the support and positioning of the mixing vat during the cleaning. In case of support on a carrier such as a conveyor belt, it can be difficult, depending on the design and dimensioning of the carrier, to maintain a sufficiently stable and accurate positioning of the mixing vat during the brushing. At higher loads and dynamic forces, additional reinforcement or guidance can be required to avoid unwanted movements. Therefore, according toa particularly advantageous embodiment, the mixing vat is kept in a carried state during the cleaning, preferably by a robotic arm or a similar manipulator that actively absorbs the weight and positions the vat accurately above the brush. As a result, a high stability is obtained during the cleaning and a uniform and reproducible cleaning result is promoted, in particular with heavy mixing vats and with increased brush pressures.

[0067] In a second aspect, the invention relates to a device for cleaning and removing a residual fraction of sealants and / or adhesives in mixing vats following a production and filling process.

[0068] The device comprises a first axially rotatable brush for the mechanical brushing of a bottom and inner wall of the mixing vat and a second axially rotatable brush for the mechanical brushing of an outlet mouth provided on the mixing vat.

[0069] In a preferred embodiment, the first brush possesses one or more of following characteristics: The first brush comprises bristles and a core. The core is made of wood, plastic or another suitable material. The first brush is cylindrical. The bristles are stuck in the core. The core comprises a recess for placement of a shaft for rotating the brush. The core is preferably built up of discs. The first brush has a diameter of at least 300 mm, preferably at least 350 mm and more preferably at least 375 mm. The first brush comprises two end faces and a lateral surface. Preferably, bristles are present both on the lateral surface and on at least one end face of the cylindrical shape. The lateral surface of the first brush is covered with bristles over a distance of at least 300 mm, preferably at least 325 mm, more preferably at least 350 mm, even more preferably at least 375 mm, and even still more preferably at least 400 mm. The distance is measured transverse to an end face of the first brush. If bristles are present on at least one end face of the cylindrical shape, the distance is measured from the at least one end face. The lateral surface of the first brush is preferably filled with at least 6 bristles per cm2, more preferably at least 7 bristles, even more preferably at least 8 bristles and even more preferably at least 9 bristles. The bristles are preferably made of steel or stainless steel. The bristles preferably have a tensile strength of at least 2200 N / mm2and at most 2900 N / mm2. Preferably, the bristles are twisted bristles, wherein the bristles are bundled per 2 to 100 bristles, preferably per 10 to 50 bristles. The twisted bristles preferably fan out in bundles. The twisted bristles preferably have a diameter of at least 10 mm at a free end, more preferably at least 15 mm and even more preferably at least 20 mm. The shaft of the first brushis preferably oriented in an upright direction. The first brush is preferably mounted on a height-adjustable axially rotatable shaft.

[0070] In a preferred embodiment, the second brush possesses one or more of the following characteristics: The second brush is cylindrical. The second brush preferably has a diameter of at least 80 mm, more preferably at least 82.5 mm, and even more preferably at least 85 mm. The second brush comprises two end faces and a lateral surface. The cylindrical brush comprises, on its lateral surface, bristles with a diameter between 0.15 mm and 0.35 mm. The lateral surface of the cylindrical brush is covered with bristles over a distance of at least 100 mm, preferably at least 120 mm, more preferably at least 130 mm, even more preferably at least 140 mm and even more preferably at least 150 mm. The distance is measured transverse to an end face of the cylindrical brush. The lateral surface of the cylindrical brush is preferably filled with at least 6 bristles per cm2, more preferably at least 7 bristles, even more preferably at least 8 bristles and even more preferably at least 9 bristles. The bristles are preferably wavy. The bristles are preferably made of steel or stainless steel. The bristles preferably have a tensile strength of at least 2200 N / mm2and at most 2900 N / mm2. The bristles preferably form a spiral on the lateral surface of the second brush. The at least 6 bristles per cm2in this case concerns the zone where the spiral is present. The second brush comprises on one side a shaft transverse to an end face for driving the second brush. The shaft of the second brush is preferably oriented in the transverse direction.

[0071] In the context of this description, "transverse direction" means a direction which is substantially horizontal relative to the vertical direction, and preferably therefore substantially perpendicular to the direction of the first brush.

[0072] An advantage of the device is that in an ergonomic and economically advantageous and efficient manner, a residual fraction of sealants and / or adhesives can be removed from mixing vats.

[0073] According to a preferred embodiment, the device comprises a robotic arm.

[0074] The robotic arm is configured for picking up the mixing vat, wherein an open upper side of the mixing vat is oriented downward, and for placing the mixing vat over the first brush. Optionally, the robotic arm is configured for moving the mixing vat up and down. This is advantageous for the cleaning of the inner wall of the mixing vatover a full height of the inner wall and for the cleaning of the bottom of the mixing vat. Alternatively, the first brush is mounted on a height-adjustable axially rotatable shaft. Optionally, the robotic arm is configured for rotating the mixing vat about its axis. This is advantageous to clean the mixing vat over a full inner circumference. Alternatively, the first brush is placed eccentrically on a laterally extending arm, wherein the laterally extending arm is rotatable about a pivot point, wherein the pivot point lies on the axis of the mixing vat. In this manner, the mixing vat can also be cleaned over its full circumference. It is clear that a combination is also possible, for example wherein the first brush is mounted on a height-adjustable rotatable shaft and the robotic arm is configured for rotating the mixing vat about its axis, or for example wherein the first brush is placed on a laterally extending arm, which is rotatable about a pivot point that coincides with the axis of the mixing vat and wherein the robotic arm is configured for moving the mixing vat up and down.

[0075] According to an embodiment, the mixing vat is exclusively carried and positioned by the robotic arm during the cleaning. The robotic arm preferably comprises a compliant positioning functionality, also designated as a "soft float," which allows limited passive adjustments to take place in the positioning during the brushing. As a result, the robotic arm can adapt to small geometric deviations of the mixing vat.

[0076] In this configuration, the mixing vat is not additionally supported during the cleaning by external supports, rests or mechanical fixations. The stability of the mixing vat is obtained by the active carrying and positioning by the robotic arm, optionally in combination with the compliant positioning described above.

[0077] This device is particularly advantageous because the mixing vat can be placed over the first brush by means of the robotic arm with the open upper side of the mixing vat downward. As a result, the bottom and the inner wall of the mixing vat can be brushed completely mechanically and the residual fraction will fall out of the mixing vat automatically. The cleaning of the mixing vat can be performed faster by means of the device since the residual fraction will fall out of the mixing vat by gravity. It is not necessary to scoop the residual fraction out of the mixing vat in an additional step. It is also advantageous that as a result the outlet mouth of the mixing vat cannot clog again. The device allows cleaning the mixing vat completely mechanically and removing the residual fraction from the mixing vat completely automatically.According to an embodiment, the second brush comprises a shaft. The shaft of the second brush is oriented in the transverse direction. The second brush is displaceable in the transverse direction. The second brush is displaceable in an automated manner. This embodiment is advantageous for moving the second brush in and out of the outlet mouth during the mechanical brushing of the outlet mouth. As a result, a residual fraction brushed loose is removed from the outlet mouth.

[0078] According to a preferred embodiment, the device comprises a belt filter. The belt filter is positioned under the first brush. The belt filter comprises a filter cloth. The belt filter comprises a collection tank for solvent which is positioned under the filter cloth. The filter cloth is suitable for collecting residual fraction of sealants and / or adhesives, while solvent passes through the filter cloth and is collected in the collection tank. The collected solvent can thus be reused in the device. The device preferably comprises a pump for pumping solvent from the collection tank to spray nozzles for spraying solvent, as is described in embodiments following hereinafter.

[0079] According to a preferred embodiment, the device comprises one or more spray nozzles for spraying solvent on the bottom and the inner wall of a mixing vat. The spraying of solvent on the bottom and the inner wall is advantageous for softening the residual fraction in the mixing vat so that the residual fraction comes loose from the bottom and the inner wall of the mixing vat more easily during the mechanical brushing.

[0080] According to a preferred embodiment, the device comprises one or more spray nozzles for spraying solvent on the first brush. The one or more spray nozzles are preferably directed toward the first brush. The solvent is suitable for dissolving the sealants and / or adhesives. The spraying of the first brush is advantageous for carrying away brushed-loose sealants and / or adhesives from the first brush. The spraying of the first brush is additionally advantageous for the cooling of the first brush.

[0081] According to a preferred embodiment, the device comprises one or more spray nozzles for spraying solvent on the second brush. The one or more spray nozzles are preferably directed toward the second brush. The one or more spray nozzles are preferably directed such that the solvent does not spray through the outlet mouth. The solvent is suitable for dissolving the sealants and / or adhesives. The spraying of the second brush is advantageous for carrying away brushed-loose sealants and / oradhesives from the second brush. The spraying of the second brush is additionally advantageous for the cooling of the second brush.

[0082] According to an embodiment, the device comprises a drying device for drying the mixing vat. The drying device preferably comprises a disc, the disc comprising an inlet for a heated or unheated airflow on an underside. The disc comprises at an upper side an opening for blowing the airflow onto the bottom of the mixing vat. The disc comprises, at a rim thereof, one or more openings for blowing an airflow onto the inner wall of the mixing vat. The one or more openings direct the airflow at an angle of 45° ± 15° onto the inner wall. The disc is preferably partially or entirely foldable. This is advantageous for limiting a required space for placing the device. During the mechanical brushing, the disc is partially or entirely folded, whereby the disc does not hinder the first and / or the second brush, but whereby the first and / or second brush can nevertheless be placed close to the disc. This embodiment is advantageous for removing residual solvent in the mixing vat. As a result, the mixing vat is immediately reusable for the production and filling process after the cleaning.

[0083] According to a preferred embodiment, the device comprises a clamping and tilting device for clamping and lifting a mixing vat. The clamping and tilting device comprises clamping arms for clamping lugs on a mixing vat. The clamping arms are preferably operated by cylinders. The clamping and tilting device comprises a cylinder for lifting the mixing vat. The clamping and tilting device further comprises a centering plate. The centering plate comprises a slot for receiving an upper edge of a mixing vat. The centering plate is displaceable from and towards the clamping arms. The centering plate can thus be clamped onto the upper edge of the mixing vat, as it were. The clamping and tilting device is rotatable about a transverse axis for tilting a mixing vat.

[0084] This embodiment is advantageous because as a result an operator does not have to perform manual actions to turn over the mixing vat. Mixing vats are usually heavy, metal vats. Having to turn such a mixing vat manually would entail great risks.

[0085] A person skilled in the technical field will appreciate that a method according to the first aspect is preferably performed with a device according to the second aspect and that a device according to the second aspect is preferably configured for performing a method according to the first aspect. Consequently, every feature described bothhereinbefore and hereinafter is applicable to each of the aspects of the present invention.

[0086] In what follows, the invention is described using non-limiting figures that illustrate the invention, and which are not intended to and should not be interpreted as limiting the scope of the invention.

[0087] FIGURE DESCRIPTION

[0088] Figure 1 shows a plan view of a device according to an embodiment of the present invention.

[0089] The device (1) comprises a robotic arm (2). The robotic arm (2) is configured for picking up a mixing vat (3). Herein, an open upper side of the mixing vat (3) is oriented downward. The robotic arm (2) comprises a gripper (4) to this end. In Figure 1, the mixing vat (3) is not gripped by the robotic arm (2), but the mixing vat (3) is placed upside down on a cart (5) after cleaning for maintenance. In Figure 1 it can further be seen that the mixing vat (3) has wheels (6) at the underside for moving the mixing vat (3). Additionally, there is also an outlet mouth (7) and a trunnion (8) at the underside. The function of the trunnion (8) is explained later. Opposing lugs (9) are arranged on an outer wall of the mixing vat (3). The function of this is also described later. The device (1) further comprises a first axially rotatable brush (10) for the mechanical brushing of a bottom and inner wall of the mixing vat (3) and a second axially rotatable brush (11) for the mechanical brushing of outlet mouth (7) of the mixing vat (3). The second brush (11) is hidden by the robotic arm (2) in Figure 1, but is visible in Figure 7. The device (1) comprises a hydraulic unit (12) for driving the first brush (10) and the second brush (11). The robotic arm (2) is configured for placing the mixing vat (3) over the first brush (10). The device (1) comprises spray nozzles (13) for spraying solvent on the first brush (10), the second brush (11) and the bottom and inner wall of the mixing vat (3). The device (1) comprises a belt filter. The belt filter is positioned under the first brush (10). The belt filter comprises a filter cloth and a collection tank (14). The collection tank (14) is placed under the filter cloth. The filter cloth is not shown in Figure 1. The filter cloth is suitable for collecting residual fraction of sealants and / or adhesives, while solvent passes through the filter cloth and is collected in the collection tank (14). The device comprises pumps (15) for pumping the solvent from the collection tank of the belt filter to the spray nozzles (13). Thus, the solvent can be reused. The device (1)comprises two clamping and tilting devices (16) for clamping and lifting the mixing vat (3). This is advantageous because a first mixing vat (3) can be prepared for cleaning on a first clamping and tilting device (16), while a second mixing vat (3) can be placed on a second clamping and tilting device (16) after cleaning. As a result, the cleaning can continue continuously. The clamping and tilting device (16) will be discussed further in Figure 8 and Figure 9. On the left clamping and tilting device (16), a gripper (4) is drawn to show the mutual position of the clamping and tilting device (16) and the gripper (4) during the picking up and placing back of a mixing vat (3). The device (1) finally comprises a drying device (29) for drying the mixing vat (3). The drying device (29) comprises a disc. The disc comprises at an underside a supply for heated or unheated airflow. The disc comprises at an upper side an opening for blowing the airflow onto the bottom of the mixing vat (3). The disc comprises at an edge multiple openings for blowing an airflow onto the inner wall of the mixing vat (3).

[0090] Figure 2 shows a perspective view of the robotic arm in Figure 1.

[0091] The robotic arm (2) is placed on a base (17). The controllers (18) of the robotic arm (2) are integrated in the base (17). The gripper (4) is attached to an end of the robotic arm (2). Valves (19) are also placed on the robotic arm (2). The valves (19) operate claws (20) and a trunnion locking device (21) on the gripper (4). The claws (20) and the trunnion locking device (21) will be discussed further later. The trunnion locking device (21) is not visible in Figure 2.

[0092] Figure 3 shows a top view of the gripper on the robotic arm in Figure 2.

[0093] The gripper (4) has four arms which form a cross. At the end of each arm are two claws (20) which are moved jointly along the arm using a cylinder (22). Such a cylinder (22) is placed in each arm (2). Lines (23) run around the gripper (4) for operating the cylinders (22). Centrally in the gripper (4) is an opening for the trunnion locking device (21). The trunnion (8) of the mixing vat (3) is received in the opening of the trunnion locking device (21). The trunnion locking device (21) further comprises pins (24) which can be slid in and out of the central opening using cylinders and which can be received in a bore (25) in the trunnion (8). The trunnion locking device (21) is an additional safety device besides the claws (20) to ensure that the mixing vat (3) cannot fall. This is shown even more clearly in Figure 5 and Figure 6.Figure 4 shows a side view of a detail of the gripper in Figure 2.

[0094] Figure 4 shows an end of an arm of the gripper (4). The claw (20) comprises a first recess (26) for gripping an upper ring of the mixing vat (3) and a second recess (27) for gripping a lower ring of the mixing vat (3). By moving the claws (20) toward the center of the gripper (4) using the cylinders (22), either the upper ring or the lower ring is clamped in the claws (20). Thus, the gripper (4) is suitable for gripping the mixing vat (3) in both a normal position and in a position wherein the open upper side of the mixing vat (3) is oriented downward. On each arm there is further a locking pin (28). The locking pins (28) move, after the clamping of the mixing vat (3) with the claws (20), up against the claws (20). The locking pins (28) prevent the claws (20) from being able to release the lower ring or the upper ring.

[0095] Figure 5 shows a detail of the mixing vat in Figure 1.

[0096] In the detail, the wheels (6) for moving the mixing vat (3) and the outlet mouth (7) are clearly visible. Further, there is a trunnion (8) centrally on the bottom of the mixing vat (3). The trunnion (8) comprises a transverse bore (25). In this bore (25), the pins (24) of the trunnion locking device (21) are received.

[0097] Figure 6 shows a top view of a detail of the gripper in Figure 2.

[0098] In Figure 6, the central opening of the trunnion locking device (21) is shown. The pins (24) are extended in Figure 6. It is clear that if the trunnion (8) is received in the central opening of the trunnion locking device (21), the pins (24) will slide into the bore (25) in the trunnion (8), whereby the mixing vat (3) is secured against falling.

[0099] Figure 7 shows a perspective view of a detail of the device in Figure 1.

[0100] Figure 7 clearly shows the collection tank (14) of the belt filter. The first brush (10) is placed above the collection tank (14). The first brush (10) is rotatable about an upright axis. Spray nozzles (13) are installed next to the first brush (10). A part of the spray nozzles (13) are directed to the left, towards the first brush (10). Another part of the spray nozzles (13) are directed upward, towards the bottom of the mixing vat (3). Yet another part of the spray nozzles (13) are directed to the right, towards the inner wall of the mixing vat (3). Finally, there is also a spray nozzle (13) directedtowards the second brush (11). This is not visible in Figure 7. The second brush (11) is placed at the top of this part of the device. The second brush (11) is rotatable about a transverse axis. A cover (30) is placed above the second brush (11) to avoid that the residual fraction which is brushed out of the outlet mouth (7), splashes out of the device (1). The cover (30) will direct the brushed-out residual fraction to the collection tank (14). The drying device (29) is also placed above the collection tank (14). As described previously, the drying device (29) comprises a disc. The disc comprises at an underside a supply for heated or unheated airflow. The disc comprises at an upper side a central opening (31) for blowing the airflow onto the bottom of the mixing vat (3). Around it are additional openings (32) on concentric circles. The disc comprises at a rim multiple openings (33) for blowing an airflow onto the inner wall of the mixing vat (3). The drying device (29) is placed above the collection tank (14) so that solvent that is blown during the drying of the bottom and the inner wall of the mixing vat (3), can be collected in the collection tank.

[0101] Figure 8 shows a perspective view of a clamping and tilting device according to an embodiment of the present invention.

[0102] The clamping and tilting device (16) comprises a centering means (34) for centering the mixing vat (3) in the clamping and tilting device (16). In the centering means (34) is a detector (35) for detecting the trunnion (8) of the mixing vat (3). If the trunnion (8) is detected, this means that the mixing vat (3) is placed correctly in the clamping and tilting device (16). The clamping and tilting device (16) further comprises clamping arms (36). The clamping arms (36) rotate about a pivot point by means of cylinders (37). The clamping arms (36) hereby close around the lugs (9) of the mixing vat (3). This is more clearly visible in Figure 9. The clamping and tilting device (16) further comprises a cylinder (38) and guides (39) for lifting the mixing vat (3) after the clamping arms (36) have clamped themselves around the lugs (9). The clamping and tilting device (16) comprises a centering plate (40). The centering plate (40) comprises a slot (41) for receiving an upper edge of the mixing vat (3). The centering plate (40) is movable from and to the clamping arms (36) for clamping the upper edge of the mixing vat (3). It is clear that a similar assembly of clamping arms (36), cylinders (37), centering plate (40), cylinder (38) and guides (39) is placed on the other side of the clamping and tilting device (16). After the clamping arms (36) are clamped around the lugs (9), the centering plate (40) is clamped against the upper edge of the mixing vat (3) and the mixing vat (3) is lifted sufficiently, the mixing vat (3) can be tilted. To this end, the centering plate (40) isrotatable about a transverse axis. In this embodiment, the transverse axis runs through the lugs (9) of the mixing vat (3).

[0103] Figure 9 shows a detail of the clamping and tilting device in Figure 8.

[0104] In Figure 9, the clamping arms (36), the cylinders (37), the centering plate (40) and the slot (41) are clearly visible. It is clear in Figure 9 how the clamping arms (36) rotate about a pivot point (42) by extending and retracting the cylinders (37). It is also clear that, upon closure of the clamping arms (36), the lugs (9) of the mixing vat (3) are clamped by the clamping arms (36) in an opening (43). By lowering the centering plate (40), the upper edge of the mixing vat (3) is clamped in the slot (41).

[0105] The numbered references in the figures are:

[0106] 1. Device

[0107] 2. Robotic arm

[0108] 3. Mixing vat

[0109] 4. Gripper

[0110] 5. Cart

[0111] 6. Wheel

[0112] 7. Outlet mouth

[0113] 8. Trunnion

[0114] 9. Lug

[0115] 10. First brush

[0116] 11. Second brush

[0117] 12. Hydraulic unit

[0118] 13. Spray nozzles

[0119] 14. Collection tank

[0120] 15. Pump

[0121] 16. Clamping and tilting device

[0122] 17. Base

[0123] 18. Controller

[0124] 19. Valve

[0125] 20. Claw

[0126] 21. Trunnion locking device

[0127] 22. Cylinder

[0128] 23. Line

[0129] 24. Pin25. Bore

[0130] 26. First recess

[0131] 27. Second recess

[0132] 28. Locking pin

[0133] 29. Drying device

[0134] 30. Cover

[0135] 31. Central opening in upper side of disc 32. Additional opening in upper side of disc 33. Opening in rim of disc

[0136] 34. Centering means

[0137] 35. Detector

[0138] 36. Clamping arm

[0139] 37. Cylinder for clamping arm

[0140] 38. Cylinder for lifting the mixing vat 39. Guide

[0141] 40. Centering plate

[0142] 41. Slot

[0143] 42. Pivot point

[0144] 43. Opening enclosed by clamping arms

Claims

CLAIMS1. A method for cleaning and removing a residual fraction of sealants and / or adhesives in mixing vats following a production and filling process, comprising the following steps:- the mechanical brushing of a bottom and inner wall of the mixing vat by means of an axially rotating first brush;- mechanically brushing an outlet mouth provided on the mixing vat by means of an axially rotating second brush;characterized in that during the mechanical brushing of the mixing vat, an open upper side of the mixing vat is oriented downward.

2. The method according to claim 1, characterized in that during mechanical brushing of the mixing vat, the first brush is sprayed with solvent.

3. The method according to claim 1 or 2, characterized in that during and preferably after the mechanical brushing of the mixing vat the bottom and the inner wall of the mixing vat are sprayed with solvent.

4. The method according to claim 3, characterized in that after the spraying of the bottom and the inner wall of the mixing vat with solvent the mixing vat is dried, wherein an airflow is directed onto the bottom and onto the inner wall and wherein the airflow on the inner wall makes an angle of 45° ± 15° with the inner wall.

5. The method according to any of the preceding claims, characterized in that, during the mechanical brushing of the outlet mouth, the second brush is sprayed with solvent.

6. The method according to any of the preceding claims 2-5, characterized in that the solvent is collected on a belt filter during the mechanical brushing, wherein the belt filter is positioned under the mixing vat, and wherein the belt filter comprises a filter cloth and a collection tank for the solvent under the filter cloth.

7. The method according to claim 6, characterized in that the solvent from the collection tank is reused for the spraying.

8. The method according to any of the preceding claims, characterized in that the mixing vat is lifted by means of a clamping and tilting device before the mechanical brushing and is subsequently turned upside down.

9. The method according to any of the preceding claims, characterized in that the mixing vat is placed upside down on a cart after the cleaning and removing of the residual fraction, after which the mixing vat is overhauled.

10. The method according to any of the preceding claims, wherein the axially rotating first brush rotates according to a planetary movement, wherein the first brush rotates both about its own axis and about a central, optionally height-adjustable rotating axis.

11. The method according to any of the preceding claims, wherein the axis of rotation of the axially rotating second brush is perpendicular to the axis of rotation of the axially rotating first brush.

12. The method according to any of the preceding claims, wherein the axially rotating first brush is substantially cylindrical and comprises at at least one axial end a brush head with a conical or substantially hemispherical shape.

13. The method according to any of the preceding claims, wherein the axially rotating second brush is cylindrical.

14. The device for cleaning and removing a residual fraction of sealants and / or adhesives in mixing vats following a production and filling process, comprising a first axially rotatable brush for mechanically brushing a bottom and inner wall of the mixing vat and a second axially rotatable brush for mechanically brushing an outlet mouth provided on the mixing vat, characterized in that the device comprises a robotic arm, wherein the robotic arm is configured for picking up the mixing vat, wherein an open upper side of the mixing vat is oriented downward, and for placing the mixing vat over the first brush.

15. The device according to claim 14, characterized in that the device comprises a belt filter, wherein the belt filter is positioned under the first brush, and wherein the belt filter comprises a filter cloth and a collection tank for solvent under the filter cloth.

16. The device according to claim 14 or 15, characterized in that the device comprises one or more spray nozzles for spraying solvent onto the bottom and the inner wall of a mixing vat.

17. The device according to claim 14, 15 or 16, characterized in that the device comprises one or more spray nozzles for spraying solvent onto the first brush.

18. The device according to any of claims 14-17, characterized in that the device comprises one or more spray nozzles for spraying solvent onto the second brush.

19. The device according to any of claims 14-18, characterized in that the device comprises a clamping and tilting device for clamping and lifting a mixing vat, wherein the clamping and tilting device comprises clamping arms for clamping lugs on a mixing vat, wherein the clamping and tilting device comprises a cylinder for lifting the mixing vat, wherein the clamping and tiltingdevice comprises a centering plate, wherein the centering plate comprises a slot for receiving an upper edge of a mixing vat, wherein the centering plate is movable toward and away from the clamping arms, and wherein the clamping and tilting device is rotatable about a transverse axis for tilting a mixing vat.

20. The device according to any of the preceding claims 14-19, wherein the axis of rotation of the second brush is perpendicular to the axis of rotation of the first brush.

21. The device according to any of the preceding claims 14-20, wherein the first axially rotatable brush comprises a cylindrical main part and is provided at at least one axial end with a brush head with a conical or substantially hemispherical shape.

22. The device according to any of the preceding claims 14-21, wherein the second axially rotatable brush is cylindrical.

23. The device according to any of the preceding claims 14-22, wherein the second axially rotatable brush has a diameter that is at least 1.5 times smaller than the diameter of the first axially rotatable brush.

24. The device according to any of the preceding claims 14-23, wherein the first brush is mounted on a vertical axially rotatable axis, and wherein the axis of the second brush is oriented in the transverse direction.

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