EP1746065B1 - Surface treatment arrangement with lifting station, and lifting station with non-cylindrical guide rollers - Google Patents

Abstract

The installation has a hub station with a lifting slide that supports guide rollers (64, 66, 68, 70) at a supporting structure, where the rollers adjoin at two points at guide posts. One of the rollers has a non-cylindrical form for obtaining guide direction, where the guide direction deviates from a radial direction. The form of the roller is described by rotation of a curved radial contour about a rotational axis of the roller. An independent claim is also included for a lifting station for vertical movement of an object e.g. vehicle body.

Description

1. a) eine ortsfeste Tragstruktur mit zwei vertikalen Führungsständern,
2. b) einen Hubschlitten, der sich über zumindest an zwei Punkten an den Führungsständern anliegenden Führungsrollen an der Tragstruktur abstützt, und
3. c) einem an dem Hubschlitten befestigten Lastarm zur Aufnahme des Gegenstands.

The invention relates to a surface treatment plant, in particular for the treatment of vehicle bodies, comprising a lifting station for vertically moving an object, the lifting station comprising:

1. a) a fixed support structure with two vertical guide posts,
2. b) a lifting carriage, which is supported on at least at two points on the guide uprights guide rollers on the support structure, and
3. c) a lifting arm attached to the lifting arm for receiving the object.

Such surface treatment equipment, as known in the art, serves to treat surfaces of articles in a variety of ways, eg, by applying paints and other coatings. Frequently such systems contain several individual treatment stations for different treatment steps, eg preparation, painting and drying. The objects to be treated, which may be, for example, motor vehicle bodies or other sheet metal parts, are used for this purpose Assistance of a conveyor system promoted from treatment station to treatment station.

For the surface treatment plant, such areas between and after the treatment stations are also counted here in which the articles to be treated are merely conveyed, stored or sorted. The promotion, storage and sorting of the objects to be treated often takes place in several levels one above the other. In these cases, there is a need to implement the objects vertically between different levels.

Vertical conversion is also required when, for some reason, individual stations of the surface treatment facility are located at different levels relative to other stations. If the objects in a station are to be treated, for example, with gases which are heavier than a surrounding atmosphere, then such a treatment is often carried out in a lowered area, for example a kind of well, so that as few gases as possible are introduced through the inlet and outlet openings of the area escape. For a lighter gas or hot air treatment, for the same reasons, it is better to place the treatment area higher.

Known in the art lifting stations, for the vertical transfer of objects in surface treatment plants are provided, have a lifting, which is guided by means of cylindrical guide rollers in the vertical direction (stroke direction). This means that the lifting can move only in the vertical direction, in the directions perpendicular thereto, however, is fixed to a support structure. The support structures of the known lifting stations contain for this purpose vertical guide stand with a rectangular cross-section, against which rest the guide rollers of the lifting. At each guide stand while a total of four guide rollers, namely in an upper vertical position of the lifting a rear and a lateral guide roller and in a lower vertical position, a front and a side guide roller.

At such lifting stations very high demands are made on the reliability. This is due to the fact that the objects are conveyed in succession through the individual treatment stations. A failure of a single lifting station therefore generally entails the shutdown of the entire surface treatment plant. Furthermore, lifting stations must be designed so that contamination of the surfaces to be treated can be avoided. Going out such contamination, for example, of lubricants that are used for lubrication of moving parts of the lifting station.

For example, shows the EP 1 468 957 A2 a column lifter for vehicle bodies according to the preamble of claim 1 with a guide stand and a lifting carriage arranged movably thereon, wherein the guide stand is formed by a double frame and the lifting carriage is guided on this via a plurality of guide rollers.

The US 6,571,970 B1 shows a monorail conveyor carriage with a telescopic mast. The telescopic mast has a plurality of hollow profiles, which are arranged one inside the other, with the help of non-cylindrical guide rollers, which cooperate with attached to the hollow profiles guide rods, the inner hollow profiles are extendable.

The JP 11 035162 A shows a movable stacker for paper with only one guide column, which has a square cross-section. A load arm pair for paper pallets is guided over double-cone shaped guide rollers on the guide column.

Against this background, it is an object of the invention to provide a surface treatment system with a lifting station, which is simple and low maintenance.

This object is achieved by a surface treatment plant according to the features of claim 1.

The use of non-cylindrical guide rollers has the advantage that it is possible to achieve guidance of the lifting carriage on the support structure with fewer guide rollers than was hitherto known in the prior art. When Radial direction is called the direction perpendicular to the axis of rotation of the guide rollers. While in the known lifting stations a guide in two different directions always required two guide rollers, can be achieved with the inventive design of the guide rollers the same effect with only a leadership role. The total number of required guide rollers can be reduced in this way and possibly even halved. Correspondingly smaller are the weight and the complexity of the lifting carriage, which has a favorable effect on the manufacturing costs and maintenance.

In order to obtain an optimal load distribution, it is expedient if two guide rollers rest against the guide carriage on the sides of the guide posts facing the lifting carriage and two guide rollers on the side remote from the lifting carriage. The guide rollers, which bear against the lifting carriage-facing side of the guide stand, should then be arranged below the guide rollers, which bear against the lifting carriage on the opposite side of the guide stand.

Particularly simple and low maintenance is a drive by means of a traction means for raising and lowering the lifting carriage, which connects the lifting carriage with a drive motor. Since it is generally unfavorable to arrange the drive motor at the upper end of the lifting station, the traction means via a at the top of the lifting station be arranged guided pulley. The drive motor can then be arranged further down and in particular in the vicinity of the lower end of the lifting station. This is advantageous in that the drive motor is better accessible for maintenance.

According to the invention, the drive motor is separated from that of the guide posts by a protective wall. This facilitates the maintenance work on the drive motor. The wall is then to be provided with openings through which the traction means is guided through the protective wall. Between the guide posts and the openings in the protective wall is a deflection roller, which deflects the traction means.

In general, the shape of the at least one guide roller can be described by rotation of a curved radial contour about an axis of rotation of the at least one guide roller. This radial contour can for example be circular arc, parabolic, hyperbolic or defined by any other curved curve.

If the at least one guide roller is to abut along a line on the guide stand, then its cross-section - or more precisely its portion facing the guide roller - must have substantially the same shape as the radial contour. If, on the other hand, it suffices that the at least one leadership role in the area of at least two points is applied to the guide stand, so the cross section and the radial contour can also be shaped differently.

It is particularly advantageous if the cross section of the guide post on which the at least one guide roller bears is circular. Guide stand with circular cross-section can be inexpensively made of steel pipes and also have the advantage that can be achieved connection stiff constructions with relatively little use of materials. The entire support structure can thereby be substantially slimmer overall and possibly realized with fewer stiffening elements than is possible with the use of rectangular profiles. The use of round tubes also has the advantage that dirt is less easily deposited and also easier to remove.

However, guide rollers of non-cylindrical shape do not necessarily have to have a curved radial contour. Thus, for example, with a guide roller, which has at least one conical section, also achieve a deviating from a radial direction guide. Also possible is the use of guide rollers, which have a cylindrical section, followed by a kind of flange, which may be conical, but also not konisch.

By using sliding bearing guide rollers, a further reduction of the maintenance effort is possible. In addition, sliding bearing guide rollers have the advantage that they can hardly run out of lubricant spatter. Therefore, otherwise required complex protection and cleaning measures may be omitted.

The at least one guide roller may have a bearing on the guide stand rolling surface, which is made of a plastic. This is advantageous in particular with regard to a low weight of the lifting carriage.

As pulling means, for example, chains made of steel or plastic or belts made of textiles, plastics or steel into consideration. However, particularly preferred is the use of a rope or a belt as a traction device, since these traction means have a low weight and do not require lubrication. In particular, steel chains often have the property that lubricants dissolve during movement of the chain as splashes and contaminate the objects to be treated. The use of traction means also has the advantage that it can be realized in a simple way a pulley, which reduces the force required to lift the lifting carriage.

To determine the height of the lifting relative to a reference point, for example, an incremental encoder provided be. The reference point can be predetermined, for example, by the level of an upstream or downstream conveyor system. Particularly preferred as a height measuring device, however, is the use of a known cable puller, which allows starting from the reference point a highly accurate absolute value measurement. One cable actuator has the advantage, inter alia, that the cable drums with the associated rotary encoder can also be located further away, eg, separated from the support structure by a protective wall. The cable transmitter can work together with a fixed reference point switch, which compensates for the determined by the cable transducer height information with the reference level on which the reference point switch is located.

At the upper end of the lifting station, at least one mechanical limit switch can also be fastened, which switches off the drive motor as soon as the lifting slide has reached top dead center.

The support structure may be provided near the upper end of the lifting station with a stationary support arrangement, e.g. connected to a steel structure or a building wall can be connected. Alternatively, it is also possible to connect the guide racks to a horizontal foot, which also includes the case where the racks are integrally formed with such a foot. The foot can be fastened to a building floor and extends at least also in the direction of the load arm. In this way, the lifting station can be securely anchored regardless of the local conditions of a surrounding building or other stationary support arrangement.

Figur 1

eine schematische Seitenansicht eines Teils einer erfindungsgemäßen Lackieranlage für Kraftfahrzeugkarosserien;

Figur 2

eine Seitenansicht einer Hubstation, die Teil der in der Figur 1 gezeigten Lackieranlage ist, wobei sich ein Lastarm der Hubvorrichtung in der unteren Hubstellung befindet;

Figur 3

die in der Figur 2 gezeigte Seitenansicht der Hubstation, wobei sich der Lastarm in der oberen Hubstellung befindet;

Figur 4

eine Rückansicht der in den Figuren 2 gezeigten Hubstation (ohne Fahrzeugkarosserie);

Figur 5

eine Draufsicht auf die in der Figur 2 gezeigte Hubstation (ohne Fahrzeugkarosserie);

Figuren 6a bis 6e

unterschiedliche Ausgestaltungen von Führungsrollen und Führungsständerprofilen;

Figur 7

eine Variante der in der Figur 2 gezeigten Hubstation, bei der Führungsständer der Hubstation über einen horizontalen Fuß an einem Gebäudeboden befestigt sind;

Figur 8

eine Draufsicht auf eine weitere Variante der in der Figur 1 gezeigten Hubstation, die einen zusätzlichen redundanten Antriebsmotor aufweist;

Figur 9

eine erfindungsgemäße Variante der in der Figur 1 gezeigten Hubstation, bei der eine Antriebseinheit durch eine Wand von den übrigen Teilen der Hubstation getrennt ist.

Further advantages and features of the invention will become apparent from the following description of the embodiments with reference to the drawings. Show:

FIG. 1

a schematic side view of part of a paint system according to the invention for motor vehicle bodies;

FIG. 2

a side view of a lifting station, part of the in the FIG. 1 shown painting is, with a load arm of the lifting device is in the lower stroke position;

FIG. 3

the in the FIG. 2 shown side view of the lifting station, wherein the load arm is in the upper stroke position;

FIG. 4

a rear view of the in the Figures 2 shown lifting station (without vehicle body);

FIG. 5

a plan view of the in the FIG. 2 shown lifting station (without vehicle body);

FIGS. 6a to 6e

different embodiments of guide rollers and guide post profiles;

FIG. 7

a variant of in the FIG. 2 shown lifting station, are attached to the guide post of the lifting station via a horizontal foot on a building floor;

FIG. 8

a plan view of a further variant of in the FIG. 1 shown lifting station having an additional redundant drive motor;

FIG. 9

a variant of the invention in the FIG. 1 shown lifting station, in which a drive unit is separated by a wall from the other parts of the lifting station.

In the FIG. 1 is a part of a paint shop for motor vehicle bodies in a not to scale and highly schematic longitudinal section shown. In the in the FIG. 1 The part shown is a drying area 10 for drying previously coated motor vehicle bodies, to which two lifting stations, which are to be explained in greater detail, are located upstream or downstream.

To the drying area 10 includes an elongated housing 14, on the bottom of a 16 indicated conveyor for the motor vehicle bodies 12 is attached. This conveying device 16 may be, for example, a roller conveyor, a chain conveyor or a combination of both. The drying area 10 further includes a heating device 18, which is indicated only schematically, and which serves to blow hot air into distribution channels from below, which run along the longitudinal sides of the housing 14. The enriched with solvent vapors hot air can be supplied via an outlet 20 back to the heater 18, from which it is cleaned, heated and returned to the housing 14.

The housing 14 is raised a few meters from a floor 22 of a surrounding building. In this way it is prevented that the heater 18 in the housing 14 introduced hot air in larger quantities at the entrance and at the exit of the housing 14 escapes from this. The increased arrangement of the housing 14 relative to the floor 22 makes it necessary to lift the motor vehicle bodies 12 before they can be conveyed through the drying area 10. Conversely, the motor vehicle bodies 12 must be lowered again at the exit of the drying area 10.

For raising and lowering of the motor vehicle bodies 12 lifting stations 24 and 25 are provided, the details of which below with reference to the FIGS. 2 to 5 be explained in more detail.

The FIGS. 2 to 5 show the lifting station 24 in side elevation in different stroke positions, a rear view and a top view. The lifting station 24 has two vertical guide posts 26, 28, which together with an upper cross-beam 30, a central cross-beam 32 and a lower cross-beam 33 form a support structure 34. The middle cross-beam 32 is connected via two fastening struts 36, 37 with a building intermediate ceiling 38 to derive on the guide posts 26, 28 acting tilting moments.

The guide posts 26, 28 and the transverse members 30, 32, 33 are each made of steel tubes with a circular cross-section. The small area moment of inertia of Tubes allow a high rigidity of the support structure 34 with low material usage.

A lifting slide 40, which can be moved in the vertical direction and is fixed relative to the supporting structure 34 in the horizontal, is supported on the guide posts 26, 28 in a manner which will be explained in more detail below. The lifting carriage 40 is composed of two vertical frame members 42, 44, two horizontal frame members 46, 48 and two stiffening struts 50, 52. The frame members 42, 44, 46, 48 and the stiffening struts 50, 52 are also made of round tubes and joined together by welding.

Of the vertical frame members 42, 44 of the lifting carriage 40 go from load arms 54, 56, which are also made of round tubes. The load arms 54, 56 carry a generally designated 58 roller conveyor which includes a plurality of successively arranged axes. The axes are driven by an electric motor and carry at their ends rollers 60. Since such roller conveyors 58 are known in the art as such, the explanation of further details is omitted here.

In the Figures 2 and 3 For the sake of clarity, a vehicle body 12 is shown mounted on a support, also referred to as skid, indicated at 62 in the drawings. The Skid 62 can be moved by means of the driven rollers 60 in the longitudinal direction of the roller conveyor 58.

The lifting carriage 40 is supported on the support structure 34 by a total of four guide rollers resting against the guide posts 26, 28 along a circular arc. Two guide rollers are mounted in the rear region of the vertical frame members 42, 44 at the same height and are located on the front of the guide post 26 and 28 at. They are therefore referred to below as the front guide rollers 64, 66. Two further, hereinafter referred to as the rear guide rollers 68, 70 rollers are mounted at angles 72 and 74 which go further up from the vertical frame members 42, 44 of the lifting carriage 40 and the guide posts 26, 28 so far embrace from the side, that the rear guide rollers 68, 70 abut against the rear sides of the guide posts 26, 28.

The guide rollers 64, 66, 68, 70, each having a rolling surface made of plastic, are slidably mounted and thus low maintenance. The shape of the guide rollers is chosen so that the rolling surfaces along circular lines on the tubular guide posts 26, 28 abut. Since the guide rollers 64, 66, 68, 70 also partially surround the guide posts 26, 28 laterally, the lifting carriage 40 is secured not only against tilting about a horizontal tilting axis but also laterally, ie along the longitudinal direction of the transverse members 30, 32, 33 the support structure 34 fixed. Further details and variants to guide the guide rollers 64, 66, 68, 70 on the guide posts 26, 28 are discussed below with reference to the FIGS. 6a to 6e explained.

For lifting and lowering the lifting carriage 40, a cable drive with two steel cables 76, 78 is provided. The two steel cables 76, 78 are attached to cable fittings 80 and 82 on the upper cross-beam 30. The free end of the steel cables 76, 78 is each guided in the manner of a simple pulley over a pulley 84 and 86, which are fixed to the upper horizontal frame member 46 of the lifting carriage 40. About mounted on the upper cross member 30 of the support structure 34 guide rollers 88, 90, the steel cables 76, 78 are guided back down, where they are rolled up on cable drums 92, 94. The cable drums 92, 94 are driven together by a drive shaft 96 which can be rotated by a drive motor 100 via a gear 98 in rotation.

Thanks to the pulleys, which are realized by the above-described guidance of the blasting cables 76, 78, for lifting the lifting carriage 40 by means of the drive motor 100 only half of the force required, which would be required if the steel cables 76, 78 after deflection over the pulley 88, 90 would be attached directly to the lifting carriage 40.

For exact determination of the vertical position of the lifting carriage 40, a cable actuator 102 is provided. The cable driver 102 includes a cable drum on which a thin measuring cable 104 is rolled up with low elongation. The cable drum can be arranged further away from the support structure 34 when providing additional deflection rollers. The free end of the measuring cable 104 is connected to the lifting carriage 40, here with its lower frame part 48. Ensuring spring loading of the drum ensures that the measuring part 104 is always tensioned. The drum, on which the measuring cable 104 is rolled, is connected to a rotary encoder which detects the angular position of the drum exactly. In this way, it is possible to precisely determine the vertical position of the lifting carriage 40 via the rotational position of the drum. In order to establish a reference point, an additional reference point generator (not shown) may be fastened to the support structure 34, which generates a signal when the lifting carriage 40 passes by. The position information determined by the cable sensor in this position can then be compared with the height at which the reference point sensor is located.

The cable driver 102 is connected to a control of the lifting station 24. The controller has the task of driving the drive motor 100 such that the lifting carriage 40 moves to a desired height supplied to the control with a predetermined speed profile and the lifting 40 stops exactly at the desired height.

• Eine Gesamtsteuerung der Anlage sorgt dafür, daß der Hubschlitten 40 der in der Figur 1 links dargestellte Hubstation 24 in die untere Vertikalposition verfahren wird, wenn sich ein Skid 62 mit einer darauf befestigten Fahrzeugkarosserie 12 der Hubstation 24 nähert. Befindet sich die Rollenbahn 58, die auf dem Lastarm 54 der Hubstation 24 befestigt ist, auf der gleichen Höhe wie eine der Hubstation 24 vorgelagerte Rollenbahn, so wird der Skid 62 mit der darauf befestigten Fahrzeugkarosserie 12 an die Rollenbahn 58 der Hubstation 24 übergeben. Der Skid 62 kann bei Bedarf auf der Rollenbahn 58 fixiert werden, um unerwünschte Bewegungen des Skids 62 auf der Rollenbahn 58 während des sich nun anschließenden Anhebens des Hubschlittens 40 zu verhindern.

In the following it will be explained how surface-treated motor vehicle bodies 12 are conveyed through the drying area 10:

• An overall control of the system ensures that the lifting carriage 40 in the FIG. 1 Left illustrated lifting station 24 is moved to the lower vertical position when a Skid 62 approaches with a vehicle body 12 mounted thereon of the lifting station 24. The roller conveyor 58, which is mounted on the load arm 54 of the lifting station 24, at the same height as one of the lifting station 24 upstream roller conveyor, the skid 62 is transferred with the vehicle body 12 mounted thereon to the roller conveyor 58 of the lifting station 24. If necessary, the skid 62 can be fixed to the roller track 58 to prevent unwanted movement of the skid 62 on the roller track 58 during the subsequent lifting of the lift carriage 40.

As soon as the roller conveyor 58 is at the level of the conveyor system 16, the conveyor system 16 takes over the skid 62 with the vehicle body 12 and guides it through the housing 14 through which hot air flows. At the end of the housing 14, the motor vehicle body 12 is moved by means of the second lifting station 25 lowered and transferred to a subsequent conveyor line.

The FIGS. 6a to 6e show different variants for cross sections of the guide posts 26, 28 and corresponding shapes of the guide rollers 64, 66, 68, 70th

When in the FIG. 6a As shown, the guide post 26a also has a circular cross section. The guide roller 64a has a rolling surface 106a which can be described by rotating a parabola 108a about the rotation axis 110a of the guide roller 64a. The guide roller 64a thus abuts the guide post 26a at two points and is thus fixed relative to it both in the radial direction and in the axial direction.

The FIG. 6b shows a variant in which the guide roller 64b facing surface of the guide post 26b, parabolic curved. In this way, the guide roller 64b abuts along a line on the guide post 26b.

When in the FIG. 6c In the variant shown, the guide post 26c has an approximately square cross section, although one edge faces the guide roller 64c.

The in the FIG. 6d shown variant corresponds functionally largely to those in the FIG. 6c is shown. However, the guide roller 64c is made of figure 6c divided on the two lying in a height guide rollers 64d and 66d.

When in the FIG. 6e In the variant shown, the guide roller 64e has a cylindrical center section 107, at the end faces of which tapered flanges 109, 109 'follow.

The FIG. 7 shows a further variant in which the guide posts 26, 28 are not attached via fastening struts 36 to a building part. Instead, the guide post 26 passes over an elbow 112 in a foot 114, which is connected via bottom plates 116, 118 to the building floor 22. The foot 114 may be formed, for example, as a steel profile.

The in the FIG. 8 in a plan view variant differs from that in the FIGS. 2 to 4 shown lifting station 24 characterized in that in addition to the drive motor 100, a redundant drive motor 100 'is provided which can be coupled to the drive shaft 96 in case of failure of the drive motor 100.

When in the FIG. 9 shown variant according to the invention, the drive unit for the lifting carriage 40 with the cable drums 92, 94, the drive shaft 96, the gear 98 and the drive motor 100 is not arranged directly below the lifting carriage 40, but horizontally offset to the rear. This allows the drive unit from the remaining parts of the lifting station 24 by a partition 120 divide. The in the FIG. 9 shown variant only requires that additional pulleys 122, 124 are provided for the steel cables 76 and 78, respectively. These deflection rollers 122, 124 may be arranged, for example, directly above the building floor 22, but also higher, approximately at the level of the lower crosspiece 33. In this variant, the intermediate wall 120 is provided with openings 126, 128, through which the steel cables 76, 78 can be guided to the cable drums 92, 94.

Claims (14)

1. Surface treatment installation, in particular for the treatment of vehicle bodies, having a lifting station (24, 25) for vertically displacing an object (12), the lifting station comprising:

   a) a stationary supporting structure (34) with two vertical guiding uprights (26, 28),

   b) a lifting slide (40) which is supported on the supporting structure (34) via guiding rollers (64, 66, 68, 70) bearing against the guiding uprights (26, 28) at least at two points, and

   c) a loading arm (54) which is fastened to the lifting slide (40) and serves for receiving the object (12),

   characterised in that
   at least one guiding roller (64, 66, 68, 70; 64a; 64b; 64c; 64d; 66d) has a non-cylindrical shape in order to obtain a guiding direction different from a radial direction,
   two guiding rollers (64, 66) bear against that side of the guiding uprights (26, 28) which faces the lifting slide (40), and two guiding rollers (68, 70) bear against that side of the guiding uprights which faces away from the lifting slide, wherein the guiding rollers (64, 66) which bear against that side of the guiding uprights (26, 28) which faces the lifting slide (40) are arranged below the guiding rollers (68, 70) which bear against that side of the guiding uprights which faces away from the lifting slide,
   a traction means (76, 78) is provided which serves for raising and lowering the lifting slide (40) and connects the lifting slide to a drive motor (100),
   the drive motor (100) is separated from the guiding uprights (26, 28) by a protective wall (120),
   the protective wall (120) has openings (126, 128), through which the traction means (76, 78) is guided through the protective wall, and
   a deflection roller (122, 124) which deflects the traction means (67, 68) is situated between the guiding uprights (26, 28) and the openings (126, 128).
2. Surface treatment installation according to Claim 1, characterised in that the shape of the at least one guiding roller (64, 66, 68, 70; 64a; 64b) is described by rotation of a curved radial contour about an axis of rotation (110a; 110b) of the at least one guiding roller.
3. Surface treatment installation according to Claim 2, characterised in that the radial contour (108a) is curved in the shape of a circular arc.
4. Surface treatment installation according to one of the preceding claims, characterised in that the guiding uprights (26, 28; 26a), against which the at least one guiding roller (64, 66, 68, 70; 64a) bears, has a cross-section which is in the shape of a circular arc at least towards the at least one guiding roller.
5. Surface treatment installation according to Claim 1, characterised in that the at least one guiding roller (64c;
   64d, 66d) has at least one conical portion.
6. Surface treatment installation according to one of the preceding claims, characterised in that the at least one guiding roller (64, 66, 68, 70) is mounted in a sliding bearing.
7. Surface treatment installation according to one of the preceding claims, characterised in that the at least one guiding roller (64, 66, 68, 70) has a rolling surface which bears against the guiding upright and is produced from a plastic.
8. Surface treatment installation according to one of the preceding claims, characterised in that the traction means (76, 78) is guided via a deflection roller (84, 86) arranged at the upper end of the lifting station (24, 25).
9. Surface treatment installation according to one of the preceding claims, characterised in that the traction means is a cable (76, 78) or a belt.
10. Surface treatment installation according to Claim 9, characterised by a block-and-tackle (76, 78, 80, 82, 84, 86, 88, 90) which reduces the force required to raise the lifting slide (40).
11. Surface treatment installation according to one of the preceding claims, characterised by a cable-controlled sensor (102) for measuring the height of the lifting slide (40) relative to a reference point.
12. Surface treatment installation according to Claim 11, characterised by a stationary reference point switch which cooperates with the cable-controlled sensor (102) and enables alignment of the height information ascertained by the cable-controlled sensor (102) with the reference height at which the reference point switch is arranged.
13. Surface treatment installation according to one of the preceding claims, characterised in that the supporting structure (34) is connected to a stationary supporting arrangement in the vicinity of the upper end of the lifting station (24, 25).
14. Surface treatment installation according to one of Claims 1 to 12, characterised in that the guiding uprights (26') are connected to a horizontal foot (114) which can be fastened to a building floor (22) and extends in the direction of the loading arm (54).

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