CN114981190A

CN114981190A - Device for dip coating workpieces on workpiece carrier and workpiece carrier for such a device

Info

Publication number: CN114981190A
Application number: CN202080093924.4A
Authority: CN
Inventors: 克劳斯·海因松; 米夏埃尔·劳尔; 延斯·亨纳
Original assignee: Duerr Systems AG
Current assignee: Duerr Systems AG
Priority date: 2020-01-22
Filing date: 2020-12-29
Publication date: 2022-08-30
Also published as: WO2021148074A1; DE102020101400A1; DE112020006583A5; EP4093692A1

Abstract

The invention relates to a device (100) for dip-treating a workpiece (130), comprising: a workpiece carrier (10) for supporting a workpiece (130) to be processed; at least one immersion bath (106) containing a liquid into which the workpiece (130) can be immersed; a conveyor belt (120) for the workpiece carrier (10); a rotation system (110) for rotating and submerging a workpiece (130) on a workpiece carrier (10) when the workpiece carrier (10) is positioned above a dipping bath (106) by means of a conveyor belt (120). At least in a processing region (104) along the conveyor belt (120) comprising the immersion bath (106), the workpiece carrier (10) is connected in a form-fitting manner to one or more conveying elements (122) of the conveyor belt (120) at least for an advancing movement along the conveyor belt (120). The invention also relates to a workpiece carrier (10) for an immersion treatment installation (100).

Description

Device for dip coating workpieces on workpiece carrier and workpiece carrier for such a device

Technical Field

The invention relates to a device for dip coating workpieces on workpiece carriers and to a workpiece carrier for such a device.

Background

It is known to convey workpieces, such as vehicle bodies, through wet processing or at least wet processing in an initial processing step of a painting installation. This is achieved by a chain system or by workpiece carriers guided on rollers.

From US 10280014B 2, an immersion treatment plant for vehicle bodies is known, in which a workpiece carrier is transported on rollers of a roller table. In this case, the workpiece carrier slides on the rollers of the roller table. If the vehicle body is positioned above the bath, it is flipped about the transverse axis and submerged into the bath. After the immersion process, the vehicle body is moved further in the same direction, removed from the immersion bath and transported further on a roller table.

Disclosure of Invention

The object of the invention is to achieve an apparatus for the immersion treatment of workpieces, in which the movement of the workpiece carrier within the immersion bath can be performed with high accuracy.

Another object of the invention is to achieve a workpiece carrier for such an apparatus.

These objects are achieved by the features of the independent claims. Advantageous embodiments and advantages of the invention result from the further claims, the description and the drawings.

According to one aspect of the invention, the invention is based on an apparatus for the immersion treatment of workpieces, comprising: a workpiece carrier for supporting a workpiece to be processed; at least one bath containing a liquid into which the workpiece may be immersed; a transport belt for the workpiece carrier; and a rotation system for rotating and submerging the workpiece on the workpiece carrier when the workpiece carrier is positioned above the immersion bath by means of the conveyor belt.

It is proposed that the workpiece carrier is connected in a form-fitting manner to one or more conveying elements of the conveyor belt at least for an advancing movement along the conveyor belt in a processing region comprising a bath at least along the conveyor belt.

Advantageously, disadvantages of the conveyor belt (in particular of the roller table) in the form of slippage between the conveyor belt and the workpiece carrier can be avoided. In particular in humid or humid atmospheres, slip occurs between the workpiece carrier and the transport system. As a result, exact positioning, in particular when the workpiece is rotating, is virtually impossible. By means of the invention, particularly under the action of torque when the workpiece is rotating and/or under the action of longitudinal forces acting on the workpiece, accurate positioning in defined positions can be ensured. This is advantageous in particular for vehicle bodies, which typically weigh around one ton. This is also advantageous when small parts with a weight of less than one ton, in particular significantly less than one ton, are to be handled.

This applies both to the so-called "stop & go" operation, in which the workpiece carrier is stopped and moved further frequently, and to the superimposed movement of the workpieces, for example, during the longitudinal travel of the workpiece carrier and during the rotation of the workpieces.

The positive transfer of the movement of the conveyor element of the conveyor belt to the workpiece carrier is virtually slip-free and can be achieved while substantially maintaining the most standardized roller bed technique.

Preferably, the positive-locking transport of the workpiece carrier takes place in a processing region in which the immersion bath is arranged. The bath is typically disposed within the process tunnel. The processing tunnel is advantageously designed such that the workpiece carrier is connected in a form-fitting manner in the processing tunnel to one or more conveyors of the conveyor belt.

Advantageously, by being able to introduce additional forces and moments by means of a form fit, an accurate and reliable forward movement can be achieved during rotation of the workpiece.

Commercially available elements such as chains, I-profiles, etc. may be used. Outside the processing area, the processing can be carried out by unchanged pulley technology (roller way). Advantageously, the transport principle is form-fit in the processing zone, for example in the processing tunnel, and outside the processing zone the transport principle is friction-fit.

Advantageously, the invention can be used in a wet plant for pretreatment and/or cathodic dip-coating, in particular by pulley technology.

Suitably, the workpiece may be a vehicle body which is treated in an immersion treatment apparatus. Alternatively, other workpieces may be pre-set.

According to an advantageous embodiment of the device, outside the processing zone, the workpiece carrier can be connected, at least in sections, with a friction fit to one or more conveying elements of the conveyor belt, at least for the forward movement along the conveyor belt. It is possible to use conveyor belts which are as common as possible and to retrofit the conveyor only in sections.

According to an advantageous embodiment of the device, one or more conveyors can be formed by toothed wheels or star wheels, at least in the processing area. Which may advantageously interact with complementary engagement elements of the workpiece carrier.

According to an advantageous embodiment of the device, the conveyor belt can be designed outside the machining region as a roller table comprising rollers on which the workpiece carrier slides. Common components may be used. Only minor modifications to existing conveyor belts are required.

In accordance with an advantageous embodiment of the device, the workpiece carrier can comprise a plurality of bolts with longitudinal axes transverse to the conveyor belt for a positive connection. Even if the conveyor belt is wet or damp in the working area, the transport element in the processing area of the conveyor belt can get caught between the bolts and cause a precise feed movement or braking.

In accordance with an advantageous embodiment of the device, the workpiece carrier can comprise a roller chain, the chain links of which are arranged transversely to the conveyor belt, for a positive connection. Advantageously, inexpensive standard components such as toothed belts, bicycle chains or motorcycle chains can be used.

According to an advantageous embodiment of the device, the rotating system can comprise a bladed wheel and/or a V-shaped guide with guide wheels and/or a moving gear with fixed position tie rods. In this case, the rotation of the workpiece above the bath can be initiated by cam control. Alternatively, the rotation of the workpiece to be treated can be brought about by a stationary rotary drive.

According to another aspect of the invention, the invention is based on a workpiece carrier which is suitable for an apparatus for the immersion treatment of workpieces.

It is proposed that the workpiece carrier comprises an engagement element which is designed such that it cooperates with one or more complementary conveyors of the conveyor belt of the device in a form-fitting manner.

Advantageously, a practically slip-free or at least low-slip force transmission can be achieved between the transfer element and the engaging element. But also for high weight workpieces, precise movement and positioning can be achieved.

According to an advantageous embodiment of the workpiece carrier, a plurality of bolts arranged in parallel can be provided as engagement elements. The bolts are arranged between the two side plates to form a ladder structure. The transmission element can be snapped into the space between the bolts. For example, the transfer element may be a star wheel or a gear and snap into the gap with a saw tooth.

According to an advantageous embodiment of the workpiece carrier, the chain links of the roller chain can be provided as engagement elements. The transfer element can be snapped into its gap. For example, the transfer element may be a star wheel or a gear and snap into the gap with a saw tooth.

According to an advantageous embodiment of the workpiece carrier, the engagement element can be arranged on a side of the workpiece carrier facing the conveyor of the conveyor belt. This allows a simple and cost-effective construction.

According to an advantageous embodiment of the workpiece carrier, the engagement element can be arranged on the i-beam. Preferably, in the installed state, the flanges at the ends are arranged vertically, and the web arranged therebetween is arranged horizontally. The engaging element may be arranged on the underside of the web. The webs simultaneously form a covering for the engaging elements and a contamination-proof protection.

According to an advantageous embodiment of the workpiece carrier, the engagement element can be arranged on the U-shaped beam. Advantageously, the U-beam is open downwards towards the conveyor belt, and the engagement member is arranged on the underside of the connecting bottom plate between the flanges.

The features mentioned individually in the claims can be combined with one another in a technically meaningful manner and can be supplemented by explanatory facts in the description and by details in the drawings, in which further embodiments of the invention are indicated.

Drawings

Other advantages result from the following description of the figures. Embodiments of the invention are shown in the drawings. The figures, description and claims contain a large number of combined features. Those skilled in the art will also suitably examine the features individually and combine them into useful other combinations.

The figures show by way of example:

fig. 1 schematically shows, in a side view, an apparatus for immersion treatment of a workpiece according to an embodiment of the invention;

fig. 2 shows the device according to fig. 1 in a top view;

FIG. 3 shows a portion of a workpiece carrier according to one embodiment of the invention, including a bolt between two vertical sidewalls and identifying a cross-sectional plane A-A, which is in contact with a conveyor in a processing area;

fig. 4 shows the workpiece carrier according to fig. 3 in contact with the transport outside the processing area and with the cross-sectional plane B-B indicated;

FIG. 5 shows a top view of the cross-sectional plane A-A of FIG. 3;

FIG. 6 shows a top view corresponding to the section plane A-A of FIG. 3, including the links on the underside of the I-beam as engaging members;

FIG. 7 shows a top view corresponding to section plane A-A of FIG. 3, including links on the underside of the U-beam as engaging members;

fig. 8 shows a top view of the section plane B-B of fig. 4.

Detailed Description

In the drawings, parts that are identical or functionally identical are denoted by the same reference numerals. The drawings are only examples and should not be construed as limiting.

Before describing the present invention in detail, it is noted that it is not limited to the corresponding components of the apparatus and the corresponding method steps, as such components and methods may vary. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the use of such terminology. In addition, if a singular or indefinite article is used in the specification or in the claims, this also relates to a plural of this element, provided that it is not explicitly stated differently throughout.

Directional terms used hereinafter with concepts such as "left", "right", "upper", "lower", "front", "rear", etc. are used only for better understanding of the drawings, and do not represent a limitation of generality in any way. The components and elements shown, as well as their design and use, may be varied with the trade-offs of those skilled in the art and may be adapted to the respective use.

Fig. 1 schematically shows, in a side view, an apparatus 100 for immersion treatment of a workpiece 130 according to an embodiment of the invention. Fig. 2 shows the device 100 according to fig. 1 in a top view.

The apparatus 100 for immersion treatment of workpieces 130 comprises a workpiece carrier 10 for supporting the workpiece 130 to be treated and an immersion bath 106 containing a liquid into which the workpiece 130 can be immersed. Further, the apparatus 100 comprises a conveyor belt 120 for the workpiece carrier 10 and a rotation system 110 for rotating and submerging the workpiece 130 on the workpiece carrier 10 when the workpiece carrier 10 is positioned above the immersion bath 106 by means of the conveyor belt 120. The rotation of the workpiece 130 is indicated by a curved arrow, and the direction of movement of the workpiece 130 on the conveyor belt 120 is indicated by a thick arrow.

In this embodiment, the workpiece 130 is a vehicle body, which is introduced into the liquid in the bath by means of the rotating system 110. The position of the workpiece 130 is indicated by means of a contour in the bath indicated by a dashed line.

A dip bath 106 is located within the processing region 104, such as within the process tunnel 102. The workpiece 130 is transported by the conveyor belt 120, which is designed as a roller table, on the workpiece carrier 10 from the region 108 outside the machining region 104 into the machining region 104, is processed there and is transported further from the machining region 104 into the further region 109. For example, in the drawing, the workpiece carriage 10 moves from left to right.

The workpiece carrier 10 is formed by two parallel guide rails 12, which are rigidly coupled by a rotary shaft 20. The workpiece 130 is arranged in a transport position above the guide rail 12 and the rotary shaft 20.

The rotation system 110 includes, for example, a fixed slew drive 110.

Within the processing zone, at least for an advancing movement along the conveyor belt 120, the workpiece carrier 10 is connected with a positive fit to one or more conveyors 122 (fig. 2) of the conveyor belt 120. In the processing zone 104, the conveyor 122 is designed as a star wheel 124. This results in a form-fitting transport technology in the process tunnel 102 or the process area 104.

Outside the machining region 104, in the

regions

108, 109, the workpiece carrier 10 is connected with a friction-fit with one or more conveyors 122 of the conveyor belt 120, at least for an advancing movement along the conveyor belt 120. In the

regions

108, 109 outside the processing region 104, the conveyor 122 is formed by rollers 126 of a common roller table. The workpiece carrier 10 can slide over the rollers 126 in a friction fit.

Fig. 3 shows a portion of a workpiece carrier 10 according to one embodiment of the invention, including the bolt 16 between two vertical side walls 38 and identifying a cross-sectional plane a-a, which is in contact with a conveyor 122 in the form of a star wheel 124 in the processing region 104 (fig. 1, 2). Fig. 4 shows the workpiece carrier 10 according to fig. 3 in contact with a transport element 122 in the form of a roller 126 in the

region

108, 109 outside the machining region 104 (fig. 1, 2), wherein the cross-sectional plane B-B is marked.

For reasons of clarity, only a few bolts 16 marked with reference numerals form a ladder-like structure with the two side plates 38, so that in the machining region 104 (fig. 1, 2) the star wheel 124 can engage in a positive-locking manner in the recesses between the bolts 16.

Fig. 5 to 7 show top views through a section plane a-a of the guide rail 12 of fig. 3, including the

different engagement elements

16, 18 of the transport element 122 for the conveyor belt 120.

Fig. 5 shows a variant visible in fig. 3, in which each guide rail 12 of the workpiece carrier 10 is formed by a plurality of parallel bolts 16 between two side plates 38. The side panels 38 may be covered by the cover 32.

Fig. 6 shows a top view corresponding to the sectional plane a-a of fig. 3, including the links 18 of the roller chain as engaging members on the underside of the i-beam 30.

Fig. 7 shows a top view corresponding to the sectional plane a-a of fig. 3, including the links 18 of the roller chain as engaging members on the underside of the U-beam 36. The flanges of the U-beams 36 form side plates 38.

The conveying element 122 is designed as a star wheel 124 and engages positively into the recesses between the bolts 16 (fig. 5) or the links 18 (fig. 6, 7).

Fig. 8 shows a top view of the section plane B-B of fig. 4. As can be seen, outside the machining region 104 (fig. 1, 2), the side plate 38 of the guide rail 12 stands on a conveyor 122 designed as a roller 126 and can be moved on the roller 126 by means of a friction fit.

Claims

1. An apparatus (100) for immersion treatment of a workpiece (130), comprising:

-a workpiece carrier (10) for supporting the workpiece (130) to be processed;

-at least one immersion bath (106) containing a liquid into which the workpiece (130) can be immersed;

-a conveyor belt (120) for the workpiece carrier (10);

a rotation system (110) for rotating and submerging workpieces (130) on the workpiece carrier (10) when the workpiece carrier (10) is positioned above the immersion bath (106) by means of the conveyor belt (120),

it is characterized in that the preparation method is characterized in that,

at least in a processing region (104) along the conveyor belt (120) comprising the immersion bath (106), the workpiece carrier (10) is connected in a form-fitting manner with one or more conveying members (122, 124) of the conveyor belt (120) at least for an advancing movement along the conveyor belt (120).

2. The apparatus according to claim 1, characterized in that outside the machining region (104), at least for an advancing movement along the conveyor belt (120), the workpiece carrier (10) is connected at least in sections with a friction-fit with one or more conveying members (122, 126) of the conveyor belt (120).

3. An apparatus according to claim 1 or 2, characterized in that one or more of the conveyors (122, 124) are formed by a toothed or star wheel (124), at least in the processing zone (104).

4. The apparatus according to any one of the preceding claims, characterized in that the conveyor belt (120), at least outside the machining region (104), is designed as a roller table comprising rollers (126) on which the workpiece carrier (10) slides.

5. The apparatus as claimed in one of the preceding claims, characterized in that the workpiece carrier (10) comprises a plurality of bolts (16) with longitudinal axes transverse to the conveyor belt (120) for a form-fitting connection.

6. The apparatus according to any one of the preceding claims, characterized in that for a form-fitting connection the workpiece carrier (10) comprises a roller chain (20), the links (18) of which are arranged transversely to the conveyor belt (120).

7. The apparatus according to any one of the preceding claims, wherein the rotating system (110) comprises a bladed wheel and/or a V-shaped guide with guide wheels and/or a moving gear with fixed position tie-rods.

8. A workpiece carrier (10) for an apparatus (100) as claimed in any of the preceding claims, characterized by an engaging element (16, 18) which is designed such that it cooperates positively with one or more complementary conveying members (122, 124) of a conveyor belt (120) of the apparatus (100).

9. Workpiece carrier according to claim 8, characterised in that a plurality of parallel arranged bolts are foreseen as engaging elements (16).

10. Workpiece carrier according to claim 8 or 9, characterised in that links of a roller chain (20) are foreseen as engaging elements (18).

11. The workpiece carrier according to any of claims 8 to 10, characterized in that the engaging element (16, 18) is arranged on a side of the workpiece carrier (10) facing a transport (122) of the transport belt (120).

12. Workpiece carrier according to any of claims 8 to 11, characterized in that the engagement elements (16, 18) are arranged on an i-beam (30).

13. Workpiece carrier according to any of claims 8-12, characterized in that the engaging elements (16, 18) are arranged on a U-beam (36).