EP2739924A1

EP2739924A1 - Method and apparatus for drying workpieces

Info

Publication number: EP2739924A1
Application number: EP12741252.6A
Authority: EP
Inventors: Wolfgang Hauser
Original assignee: Venjakob Maschinenbau GmbH and Co KG
Current assignee: Venjakob Maschinenbau GmbH and Co KG
Priority date: 2011-08-03
Filing date: 2012-07-26
Publication date: 2014-06-11
Anticipated expiration: 2032-07-26
Also published as: EP2739924B1; WO2013017230A1; CN103797322A; CN103797322B; DE102011109325A1; US20140173928A1; DE102011109325B4

Abstract

The invention relates to a method and an apparatus for drying, in particular for drying varnished workpieces (6), having at least two drying units (2), wherein the individual drying unit is equipped to receive a number of varnished workpieces, and heating means which are equipped to generate a constant temperature in the drying apparatus (1) and in each of the drying units (2).

Description

Method and device for drying workpieces

Field of the invention

The invention relates to a method for drying painted workpieces. Furthermore, the invention relates to a device for drying painted workpieces. State of the art

The prior art drying devices for

Drying of painted workpieces known. Such methods and arrangements have been used in great numbers for a long time and in a number of industries.

While in the industrial sector the freshly painted

Curing workpieces in dry canals with UV light and hot air is mainly used in the trades for passive drying systems. The painted parts remain in the surface area until they are cured to the extent that they can be further processed. For the storage of freshly treated parts are known from the prior art, for example. Hordenwagen. These usually have a scissor link in order to adjust the distance of the pads to the workpiece length can. The workpieces on the pallet trucks are moved to drying in drying chambers where they stay until final drying. DE 10 2010 012 173 B3 describes an apparatus for drying articles, in particular painted vehicle bodies, comprising a drying tunnel. In the drying tunnel a painted workpiece is dried. The known from the prior art drying tunnel have the disadvantage that only a certain residence time for the drying is scheduled for the painted workpieces. During drying, the painted workpieces pass through a drying tunnel in a predetermined time. In this drying tunnel there is no possibility to dry the painted workpieces for different lengths of time. This means that no flexible drying times are possible.

Object of the invention

The object of the present invention is to improve the disadvantages of the prior art. Accordingly, it is an object of the present invention to provide an apparatus and method for drying, especially painted workpieces, in which flexible drying times are achievable. Another object of the invention is, during the residence time in the drying apparatus the

To rest workpieces, i. that the workpieces do not experience any movement.

DESCRIPTION OF THE INVENTION The object is solved by the independent claims.

Advantageous developments are defined in the subclaims.

To achieve the object, the present invention proposes a drying device, in particular for drying painted workpieces, comprising at least two drying units, wherein the single drying unit is adapted to receive a number of painted workpieces, and heating means, which are set a constant temperature in the tro - and to produce in each of the drying units.

The drying device is preferably designed as a tower or dry tower. The drying device is used to dry painted workpieces. The drying device has at least two drying units in which the workpieces to be dried can be introduced and dried. The drying device can also be an evaporation device, a

Be misting device or a tempering.

The term drying means any type of crosslinking, polymerization and curing of material, in particular the curing of a coating by radiation. In doing so, a high surface quality and thus a uniform smoother course of the paint should be achieved.

The drying process of the painted workpieces is carried out in the drying units of the drying device preferably at 80 ° C. Correspondingly, different temperatures for drying painted workpieces are to be selected when paints require a higher or lower temperature for drying on a workpiece. The evaporation process of the painted workpieces is preferably carried out at room temperature in the evaporator. During the evaporation process, the volatile parts of a paint applied to a workpiece volatilize. Annealing heats a material for an extended period of time. With such a method it is possible, for example, to control the distribution of mechanical stresses in a component. By annealing it is possible to target the structure and the physical properties of a To change solids, for example, the structure of workpieces made of metal. The control of the aging process or a Antikisierungseffektes a workpiece is thus possible. The lacquered workpieces are preferably painted sheets, in particular parts from the automotive industry, as well as lacquered objects made of wood, plastic, porcelain or ceramic, etc. A number of lacquered materials are preferably a plurality of lacquered materials Workpieces that can be applied to a workpiece carrier system, a pallet or another device and are collectively introduced into a drying unit.

The at least two drying units are dimensioned so that individual workpieces or a certain number of

Workpieces (eg. On a workpiece carrier system) are receivable and dryable in the drying unit.

The drying units are preferably designed as chambers or drying chambers, which are dimensioned accordingly for drying workpieces. The heating means are provided as a heat source for the drying of the painted workpieces. Such heating means produce, for example, medium or long-wave infrared radiation or UV light. By means of hot air, drying is also possible. The heating means are arranged centrally in the drying device, so that each drying unit can be heated to a predetermined temperature. Thus, a predetermined constant temperature is established in each of the drying units and in the entire drying apparatus at which the number of painted workpieces is to be dried. In addition to the Temperature, the humidity within the drying device and the supply and the composition of a gas are adjustable. During drying, a warm air flow is generated in the corresponding drying unit. The air flow flows during the drying phase in the horizontal and / or vertical direction in the individual chambers. Preferably, the individual chambers have perforated trays which allow air flow from chamber to chamber in the drying device. Thus, in addition to the above-mentioned air flows in the individual chambers of the drying device, which has, for example, superimposed drying units, a vertical air flow from chamber to chamber.

In a preferred embodiment of the inventive drying device, the drying units can be loaded independently of one another with workpieces.

A first number of painted workpieces is stored in a corresponding first drying unit, so that the first drying unit can be loaded with workpieces. A second number of painted workpieces is stored in a corresponding second drying unit, so that the second drying unit can be charged with workpieces independently of the first drying unit. In a further preferred embodiment of the inventive drying device, the drying units have at least one opening, which are set up as an input and / or output for the workpieces to be dried. The openings are closable openings, such as flaps. But it can also be provided locks for closing the openings. The openings must be closable so that the same temperature prevails within the drying unit in the drying units. An air supply from outside the drying device can be prevented.

In a further preferred embodiment of the inventive drying device, the drying device has at least one distributor device, wherein the workpieces are storable and / or storable by means of the distributor device in the drying units. The distributor device is designed on the one hand to load the drying units of the drying device painted with workpieces. On the other hand, the distributor device is designed to bring the dried workpieces (after drying) out of the corresponding drying unit again.

In a further preferred embodiment of the inventive drying device, the distributor device has a lifting device and a conveying device.

The lifting device is slidably mounted on the distributor device. A displacement of the lifting device takes place vertically along the distributor device and corresponds to an up and down movement of the lifting device. The lifting device further comprises a conveying device. The lifting device raises the workpieces to the height where there is a free drying unit for receiving the workpieces in the drying device. The workpieces are then using the distributor device can be stored in the drying units and / or outsourced.

In a further preferred embodiment of the inventive drying device, the dimensions of the drying unit for receiving a workpiece carrier system are selected.

The number of workpieces can be stored on a workpiece carrier system in the drying unit. The workpiece carrier system is, for example, a transport unit for receiving the plurality of workpieces or for receiving only one workpiece. The workpiece carrier system may, for example, also be a belt, grid, steel, belt transport or roller conveyor belt. The conveying device, as described above, can also be designed as a workpiece carrier system.

In a further preferred embodiment of the inventive drying device, the distributor device has a lifting device and / or a displacement device.

While the lifting device, as described above, can perform only a vertical up and down movement along the distributor device, the displacement device performs a horizontal movement of the distributor device.

In a further preferred embodiment of the inventive drying device, the drying units are arranged vertically one above the other and / or vertically next to one another.

Thus, it is possible to load a plurality of drying units side by side and one above the other with workpieces. In a further preferred embodiment of the inventive drying device, the drying device has a control unit for controlling the distributor device. The control unit is set for storage of the workpieces in a free drying unit in the drying device and for the removal of the workpieces from the drying device.

Furthermore, the control unit has a timepiece, a memory and a processor for determining the residence time of the workpieces in each case one of the drying units.

The timer is used to measure the time that the workpiece to be dried in the drying device has already dried. The memory stores all information, for example, which lacquer is to dry on which workpiece, how long the workpieces already dry in the drying unit and how long the drying process will take in which of the drying units. The processor calculates when the workpieces are removed from the device ready dried. The control unit detects whether a free drying unit is available in the drying device. If a free drying unit is found, the workpiece is stored in the free drying unit by means of the distributor device controlled by the control device. As mentioned above, the control unit determines how long a workpiece has to dry at a constant temperature. After completion of the drying process, the dried workpiece is removed from the drying unit by means of the controlled distributor device.

In a further embodiment of the present invention, further drying devices are provided, which can be approached by means of distributor device and displacement device. By means of a displacement device, the distribution device with the lifting device and the conveyor device is horizontally displaceable. Further horizontally juxtaposed drying devices can be approached, which, for example, all have the same temperature T1 in the drying units, as described above.

However, drying devices are also provided which, unlike the drying devices described above, have a different temperature T2 for drying the workpieces, the temperature T2 in the drying units also being constant here. To achieve the object, the present invention proposes a method for drying, in particular for drying painted workpieces, comprising the following steps: receiving a first number of painted workpieces in a drying unit of a drying device, drying the first number of painted workpieces in the first drying unit at a constant temperature T, receiving at least a second number of painted workpieces in a further drying unit of the drying device, drying the at least second number of painted workpieces in the further drying unit at a constant temperature T, removing the first number of painted workpieces from the respective drying unit after a Drying time tl and removal of the second number of painted workpieces from the second drying unit after a drying time t2.

At a constant temperature T in the drying apparatus, the first and the second number of workpieces can be dried independently of one another in terms of time. Accordingly, the first number of workpieces, for example, after a time tl and the second Number of workpieces are outsourced after a time t2 from the drying device. Furthermore, further number of workpieces t3-ti can be dried independently of one another at constant temperature T in the drying device.

In a further preferred embodiment of the inventive method for drying, a drying of painted workpieces in at least one second drying device with a constant temperature T2 is provided.

At a constant temperature T2 in the second drying device, the first and the second number of workpieces can be dried independently of one another in terms of time. Accordingly, the first number of workpieces, for example, after a time tl and the second number of workpieces after a time t2 be outsourced from the second drying device. Furthermore, a further number of workpieces t3-ti at constant temperature T in the second drying device can be dried independently of one another over time.

Brief description of the figures

FIG. 1 shows a first schematic view of the drying device according to the invention, wherein a first number of painted workpieces is located on a conveying device.

Figure 2 shows a second schematic view of the drying device according to the invention, wherein the first number of painted workpieces is on a lifting device.

Figure 3 shows a third schematic view of the drying device according to the invention, wherein the first number of painted workpieces is in a drying unit. Figure 4 shows a fourth schematic view of the drying device according to the invention, wherein a second number of painted workpieces is removed from the drying unit. FIG. 5 shows a plan view of the drying device according to the invention of FIGS. 1-4.

FIG. 6 shows an alternative embodiment of FIG. 5. FIG. 7 shows an alternative embodiment to FIGS. 1-6.

FIG. 8 shows a top view of the drying device according to the invention of FIG. 7.

Description of preferred embodiments

FIG. 1 shows a conveying device 8 which extends from the painting device 10 to a distributor device 3.

On the distributor device 3, a lifting device 4, which is vertically displaceable upwards along the distributor device 3, is mounted. The lifting device 4 has a conveying device 5. The conveying device 5 is provided on the lifting device 4.

The lifting device 4 facing away from the end of the conveyor device 5 is connected to a drying device 1.

The drying device 1 according to the invention consists of a multiplicity of drying units 2.1 to 2.15 arranged one above the other. For clarity, not all drying units are labeled individually. The drying device 1 also has a control unit 12. The distributor device 3 and the drying device 1 can be controlled by the control unit. The storage of the painted workpieces 6.1 in a free drying unit 2 of the drying device 1 and the outsourcing of the dried workpieces 6.1 from the drying device 1 are executable by means of the control unit 12. A number of painting workpieces 6.1, which have left the painting device 10, located on the conveyor device 8 on the way to the distribution device 3 (arrow A). The workpieces are then placed on the lifting device 4 of the distributor device 3 in order to be conveyed vertically upwards along the distributor device (arrow B), as shown in FIG. The lifting device 4 conveys the workpieces up to a height where a free drying unit 2.6 is ready to receive the workpieces 6.1. FIG. 2 shows the vertical displacement of the lifting device 4 along the distributor device 3 (arrow B). The original position of the lifting device 4 and the Fördevorrichtung of FIG. 1 is shown in dashed lines. Each drying unit 2.1 to 2.15 has an opening 7, which is provided with a flap to prevent an air supply from outside the drying device 1. The opening 7 is located on the side of the drying unit at which the workpieces are stored and retrieved. For the sake of overview only one opening 7 is shown.

The workpieces 6.1 to be dried are located on the conveyor 5 on the way to the drying device 1 (arrow C). As shown in Figure 3, the flap 7 is folded up. The drying unit 2.6 is prepared for the storage of the workpieces 6.1. The conveyor 5 conveys the

Workpieces 6.1 in the free drying unit 2.6. After the storage of the workpieces 6.1, the flap 7 is closed again. The drying process takes place at a constant temperature in the entire drying device 1 in the drying unit 2.6.

FIG. 4 shows further workpieces 6.2, etc., which have also been stored in the drying device 1 in further drying units 2.4, etc. for the drying process at a constant temperature. The drying time of the workpieces 6.2 is completed in FIG. 4, so that the workpieces 6.2 can be removed from the drying unit 2.4. Since the drying of the workpieces 6.2 takes place temporally independently of the drying of the workpieces 6.1, etc., the drying of the workpieces 6.1, etc. in this case is not completed. The flap 7 is opened to the dried workpieces 6.2 from the

Drying unit 2.4 outsource. The outsourcing of the workpieces 6.2 takes place in the direction of arrow D. The conveying device 5 stores the workpieces 6.2 out of the drying unit 2.4 in the direction of the distributor device 3.

As shown in the plan view in Figure 5, the

Workpieces 6.2 can be transported away by means of a conveyor 9. For this purpose, the lifting device 4 must first be lowered to the level of the conveying device 9 with the workpieces 6.2.

In FIG. 5, further drying devices 1.1 to 1.4 arranged horizontally next to one another are provided, all of which have the same temperature in the drying units (for example 60 ° C.). FIG. 5 also shows a displacement device 11. By means of the displacement device 11, the distribution device 3 with the lifting device 4 and the conveying device 5 is horizontally displaceable (arrow E). Painted workpieces can be stored in one of the free drying units of the drying devices 1.1 to 1.4. After drying, the workpieces on the conveyor 9 are transported away. FIG. 6 shows, like FIG. 5, a displacement device 11. By means of a displacement device 11, the distribution device 3 with the lifting device 4 and the conveying device 5 can be displaced horizontally (arrow E). In FIG. 6, in addition to the drying devices 1.1 to 1.4, further drying devices arranged horizontally next to one another are provided. For clarity, not all dryers are individually labeled. The other drying devices have to the drying devices 1.1 to 1.4 other temperatures in the respective drying units (eg. 25 ° C, 45 ° C, 60 ° C and 80 ° C). For clarity, not all dryers are individually labeled.

FIG. 7 shows an alternative embodiment to FIGS. 1 to 6. In contrast to FIG. 4, after the drying time of the materials, not the flap 7 but the flap T is opened in order to remove the dried workpieces from the drying unit. The flap 7 'is arranged on the opposite side of the flap 7. In Figure 7, the outsourcing of the workpieces 6.1 in

Arrow direction D. The conveying device 5 'transports the workpieces 6.1 in the direction of the distributor device 3' onto the lifting device 4 '. The lifting device 4 is at the level shut down the conveyor 9 '. The workpieces 6.1 can be removed via the conveyor 9 '.

FIG. 8 shows, in contrast to FIG. 6, a further sliding device 11 '. By means of displacement device 11 'is the distribution device 3' with the lifting device 4 'and the conveyor 5' horizontally displaceable (arrow E '). This makes it possible to outsource dried workpieces from the drying device 1 and to feed the conveying device 9 '(arrow F'). As in FIG. 6, in addition to the drying devices 1.1 to 1.4, further drying devices arranged horizontally next to one another are provided. For the sake of clarity, not all dryers are individually labeled. The other drying devices have to the drying devices 1.1 to 1.4 other temperatures in the respective drying units (eg. 25 ° C, 45 ° C, 60 ° C and 80 ° C). For clarity, not all dryers are individually labeled. The invention provides an apparatus and a method for drying, in particular painted workpieces, in which flexible drying times can be achieved and in which the workpieces can rest during the dwell time in the drying apparatus.

Drying device

drying unit

distribution device

lifting device

conveyor

workpiece

shutter

conveyor

painter

Shifter

control device

opening

Claims

claims

1. drying device (1), in particular for drying la ckierten workpieces (6), comprising

- At least two drying units (2), wherein the single ne drying unit is adapted to receive a number of painted workpieces, and

- Heating means which are adapted to a constant tempering temperature in the drying device (1) and in each of the drying units (2) to produce.

2. Drying apparatus (1) according to claim 2, wherein the drying units (2) are independently loadable with workpieces (6).

3. Drying device (1) according to one of the preceding Ansprü surface, wherein the drying units (2) at least one opening (13, 13 ') which are arranged as an input and / or output for the workpieces to be dried (6).

4. Drying device (1) according to one of the preceding Ansprü surface, further comprising at least one distributor device (3, 3 '), wherein the workpieces (6) by means of the distributor device (3, 3') in the drying units (2) storable and / or are outsourced.

5. Drying device (1) according to one of the preceding Ansprü surface, wherein the distributor device (3, 3 ') has a lifting device (4, 4') and a conveying device (5, 5 ').

6. drying device (1) according to one of the preceding claims, wherein the dimensions of the drying unit (2) are selected for receiving a workpiece carrier system.

7. Drying device (1) according to one of the preceding claims, wherein the distributor device (3, 3 ') has a lifting device (4, 4') and / or displacement device (11, 11 ').

8. Drying device (1) according to one of the preceding claims, wherein the drying units (2) are arranged vertically one above the other and / or vertically next to each other.

9. drying device (1) according to one of the preceding claims, further comprising a control unit (12) for driving the distributor device (3, 3 '),

- For storage of the workpieces (6) in a free drying unit (2) in the drying device (1) and

- For removal of the workpieces (6) from the drying device (1).

10. Drying apparatus (1) according to claim 9, wherein the control unit (12) comprises a timepiece, a memory and a processor for determining the residence time of the

Workpieces (6) in each case one of the drying units (2).

11. drying device (1) according to one of the preceding claims, further comprising further drying devices (1.1, 1.2, etc.) which by means of distribution device (2) and displacement device (11) are approachable.

12. A method for drying, in particular for drying painted workpieces (6), comprising the following steps: - Recording a first number of painted workpieces (6) in a drying unit (2) of a drying device

(1),

Drying the first number of painted workpieces (6) in the first drying unit (2) at a constant temperature T,

Receiving at least a second number of painted workpieces (6 ') into a further drying unit (2') of the drying device (1),

Drying the at least second number of painted workpieces (6 ') in the further drying unit (2') at a constant temperature T,

Removal of the first number of painted workpieces (6) from the respective drying unit (2) after a drying time tl,

- Taking the second number of painted workpieces (6 ') from the second drying unit (2') after a

Drying time t2. A method of drying according to claim 12, further comprising the step of:

Drying of painted workpieces (6, 6 ') in at least one second drying device with constant temperature T2.