EP0223118A2 - Cleaning device for shuttering elements - Google Patents

Abstract

1. A device for cleaning formwork elements (26) and similar formwork parts, which are moved by means of conveying devices along a guide path through sequentially placed cleaning stations, comprising cleaning elements (31 and 32) for the lower side (27) and the longitudinal edges (64), a cleaning device (36) for cleaning at least one end face (38) of a formwork element (26) with an end face cleaner (37) able to be moved in a direction across the direction of conveying through the path of the formwork elements during a pause in the conveying action, characterized in that the conveying rolls (8 through 11) for the formwork elements (26) are arranged in pairs on opposite sides of the guide path opposite to each other, one conveying roll being able to be adjusted towards the other while spring loaded, and in that such end surface cleaner (37) has a sandwich shaving block (85) of shaving blades (81) and intermediately placed plates of a plastic having at least restricted rubber-elastic properties, whose side edges are set back in relation to the ends (86 and 87) of the shaving blades (81).

Description

The invention relates to a device for cleaning grinding elements and the like formwork parts, with at least two pairs of conveyor rollers arranged transversely to the direction of flow, one of which is provided adjustable against the other, and with cleaning elements for the underside and the longitudinal edges.

Devices of this type are known in various forms, for example from AT-PS 242 347. The device shown there is specially designed for cleaning formwork panels, formwork boards and the like, wherein between the two pairs of conveyor rollers, two sheet-shaped scrapers offset in the direction of travel to one another on the bottom and top and furthermore on the opposite side on the one side and fixed on the device other side scraper adjustable across the direction of flow are attached to scrape the side plate edges. These scrapers are usually formed by individual scraper blades which, in deviation from a transverse plane to the conveying direction, are slightly inclined in this direction. In addition, the conveyor rollers are designed there as crusher rollers, which break up the concrete crust adhering to both sides of the formwork panels to be passed through, in order to make scraping easier. While the upper conveyor rollers are adjusted by hand, the adjustable side scraper is controlled by a feeler lever, which rests on a side surface of the continuous formwork panel under spring load.

In recent times, formwork technology has been largely determined by the use of so-called "formwork elements", the rear part of which is formed by a lattice structure made up of individual sheet metal webs which are arranged transversely to the element level and welded to one another, and a formwork panel, for example the conventional one, can be exchanged on the inside that comes into contact with the concrete Type carries, the edge of which is surrounded by the frame of the support grid.

Since the back of such formwork elements does not come into contact with the concrete, there is no need to use special scrapers or other mechanical cleaning elements, especially since they could only come into contact with the back of the grid bars. In addition, a limited cleaning effect is achieved there by the conveyor rollers on the back. On the other hand, the end faces, like the side edges, cannot be kept completely free of concrete. Since it is not possible to clean the end faces during the continuous movement, this cleaning is usually not done at all, otherwise it is carried out by hand. This still applies to the previous and relatively thin formwork panels, but is quite cumbersome and difficult with the thick and heavy formwork elements now used.

Starting from the device defined at the outset, the invention therefore pursues the task of cleaning these end faces as completely as possible by machine, at least for thick formwork elements.

To achieve this object, according to the invention a cleaning device for cleaning at least one end face of a formwork element is arranged between two pairs of conveyor rollers, with an end face cleaner which can be moved through the path of the formwork elements in a conveying pause transversely to the conveying direction.

This end face cleaner can be designed in a conventional manner as a scraper, milling cutter or the like, but should in any case be such that the end face of a relatively thick formwork element is properly cleaned after one or two cleaning operations. In principle, it is therefore only necessary to stop the conveyor rollers and to pass the end face cleaner or the cleaning tool through the transport path in sufficient contact with the formwork element in order to thereby effect cleaning. The formwork elements therefore have to be conveyed in cycles, while conventional thin formwork panels, which generally do not require a separate end face cleaning, can pass through in the conventional manner without stopping, as can individual formwork boards.

A common end face cleaner is expediently used for the front and rear end faces of the formwork elements. For example, it can have a sandwich scraping block made of scraping sheets and interposed plates made of plastic which can be deformed at least to a limited extent in a rubber-like manner. Both ends of each scraper blade thus form at least * scraper edge and are referred to below as the cleaning surface. Since these protruding ends can also deform separately, several scraping edges can be brought into engagement on each side. Advantageously, a reciprocating movement of the end face cleaner on the same end face executes two oppositely directed scraping operations, which practically always achieves an adequate degree of cleaning. *a

Advantageously, the vertical and approximately parallel to the conveying direction of the shuttering elements arranged scraping block about a vertical axis over a few angles is held so that it can be pivoted to a limited extent Reduce the angle of attack, reduce the contact forces and increase the available spring action.

This also increases the position tolerance range in which the end face to be machined is held during the scraping process. Limiting the pivoting angle of the scraping block by means of an elastically deformable intermediate link increases the possibility of adaptation.

In order to be able to stop the formwork elements in the respective position for cleaning the end face, at least one sensing device, in particular two, is provided for palpating the end face of a formwork sheet in the area of a cleaning transverse plane. This or each sensing device can be switched off separately and the trigger of a sequence control for stopping the conveyor rollers, performing an end face cleaning process and switching the conveyor drive on again.

• Fig. 1 in schematischer Darstellung eine Seitenansicht der wesentlichen Teile einer erfindungsgemäßen Reinigungsvorrichtung,
• Fig. 2 eine Ansicht der Vorrichtung nach Fig. 1 von oben in dieser Figur gesehen,
• Fig. 3 eine Seitenansicht eines erfindungsgemäß verwendeten Stirnflächenreinigers,
• Fig. 4 eine Ansicht dieses Stirnflächenreinigers von oben in Fig. 3 gesehen,
• Fig. 5 eine teilweise geschnittene Schwenkhalterung für einen Schaberblock nach Fig. 3 und 4 und
• Fig. 6 eine Ansicht dieser Schwenklagerung*unten in Fig. 5 gesehen. * von

Further features and advantages of the invention are defined in the subclaims and explained below with reference to the drawing. Show it

• 1 is a schematic side view of the essential parts of a cleaning device according to the invention,
• 2 is a view of the device of FIG. 1 seen from above in this figure,
• 3 shows a side view of an end face cleaner used according to the invention,
• 4 is a view of this end face cleaner seen from above in FIG. 3,
• Fig. 5 is a partially sectioned pivot bracket for a doctor block according to FIGS. 3 and 4 and
• Fig. 6 is a view of this pivot bearing * seen in Fig. 5 below. * from

As can best be seen from FIG. 1, (1) denotes a machine frame which is designed as a trailer vehicle with rubber tires (2) and a drawbar (not shown) or which is fixedly movable on feet or small lockable castors. On this machine frame, an inlet boom (3) * with rollers (4) is attached on the right in FIG. 1. Both booms can be removed for road transport. The lateral rollers (4) determine a guide track (19) of variable width and height with lateral guide rollers (18).
* and on the left an outlet boom (5) Symmetrical to a central plane (6) of the machine frame, two conveyor rollers (8, 9) associated with the same support plane (7) as the rollers (4) are stored in the machine frame. Two upper conveyor rollers (10, 11) are mounted vertically above this in a lifting frame (12) which is guided at its corners in vertical profile bars (13) and is arranged vertically adjustable parallel to itself by means of four threaded spindles (14) arranged close to them. For this purpose, the spindles (14) carry chain wheels (15), which are enclosed and truncated by a chain (16). The frame (12) can therefore be adjusted with the conveyor rollers (10, 11) using a single hand crank (17). All conveyor rollers (8-11) remain connected to a common conveyor motor by a common drive chain.

The bearing blocks (21) of the upper conveyor rollers (10, 11) sit in vertical guides (22) and are pressed down by compression springs (23) up to a stop bar (24).

Numeral (26) denotes a formwork element, the underside (27) of which is the formwork skin level forms by means of an embedded formwork panel (28), but otherwise has a latticework (29) of intersecting webs, the edge webs of which also encompass the edge of the interchangeably attached formwork panel (28).

To clean the underside (27) when a formwork element passes through the cleaning machine in the direction of the arrow (30), two flat scrapers (31, 32) are used, which are close to the conveyor rollers (8, 9) between them in the side support beams (33) of the Frame (1) are held.

Again between these surface scrapers there is a cleaning device (36) with an end surface cleaner (37) which is arranged parallel to the front end surface (38) of a formwork element (26) and thus parallel to the conveyor rollers (8 to 11).

This cleaning device comprises a guide bar (41) drawn into the lifting frame (12) parallel to the conveyor rollers, on which a tool slide (43) is guided by means of rollers (42), which carries the end face cleaner (37) on its underside and is driven by a geared motor ( 44) is adjusted via a chain loop (45). A projection (46) attached to the slide (43) serves to actuate two limit switches (47, 48). Normally, the carriage (43) is at the top in FIG. 2 after the limit switch (47) serving as an off switch has been actuated. The limit switch (48), on the other hand, controls the reversal of movement of the geared motor (44). After triggering an end face cleaning, the front end face (38) is cleaned by two scraping operations carried out in different directions.

A button switch in the form of a light barrier (51) with a transmitter and receiver mounted in the same housing is used to initiate a cleaning process. arranged reflector (50) interacts. The scanning plane (52) is arranged at a short distance from the cleaning plane in the direction of passage, in which the end face (38) according to FIG. 3 is located. This end face therefore always comes to a stop with a slight deviation after the light barrier has sensed the front end of the formwork element (26), has interrupted the drive of the conveyor rollers (8 to 11), which is expediently provided with a brake, and has shut the rollers down. Almost simultaneously, the geared motor (44) is switched on and moves the tool slide (43) with a first cleaning surface (56) of the end surface cleaner (37) from the limit switch (47) to the limit switch (48) and back in two scraping processes over the end surface (38) .

Immediately upon actuation of the limit switch (47), the drive for the conveyor rollers (8) is then switched on again and the formwork element (26) is transported on from the position shown. The transport switch position is maintained once by the switch-on position of the light barrier (51) and also by the switch-on position of a second light barrier (53), the sensing plane (54) of which is in turn in the transport direction just before the plane in which the rear end face is located (55) of the formwork element comes to a standstill and can then be processed by the second cleaning surface (57) of the end face cleaner (37).

Here, too, the gear motor (44) is switched on again when the return switch (47) is actuated and the drive of the conveyor rollers is started. As a result, the formwork element (26) is conveyed further out of the second stop position 26 'drawn with dash-dot lines and then impregnated by means of a lower foam roller (61) immersed in an impregnating agent bath (60) and a side-mounted foam roller (62) mounted on the frame, and one of these opposing arranged adjustable foam roller (63). Shortly before the foam roller (62) is attached to the side surface (64) of the formwork element fixed to the frame side scraper (65). A movable side scraper (66) is mounted with the roller (63) on a common support (67) which can be adjusted transversely to the conveying direction (30) by means of a spindle (68) with a hand crank (69). (70) denotes a surface scraper lying on the underside (27), which has a rubber-like soft lip (72) for stripping off the previously applied impregnating or separating agent (60).

In order to put the formwork cleaner shown into operation, the opening width between the conveyor rollers (8 to 11) and the opening width between the side scrapers (65, 66) is first of all adjusted according to an inserted pattern of the formwork part to be cleaned by means of the crank (17). and the foam rollers (62, 63) are adjusted. The desired mode of operation, with or without end face cleaning, is then preselected by a switch actuation, and the formwork element or other formwork part only needs to be placed on the rollers of the inlet-side bracket (3). The entire further cleaning process runs automatically after switching on the drive of the conveyor rollers (8 to 11). Only if conventional formwork panels should be cleaned on both sides, they can be run through again after turning.

3 and 4 is designed as a scraper block (85) with four scraper blades (81) and two outer cover sheets (82) made of spring steel, which are glued to intermediate damping plates (83) made of at least weakly elastic, damping material and from three holes (84) are penetrated. The ends (85) and (87) of the scraper blades (81) protrude on both sides from the square-shaped base body, the actual scraper block, which is determined by the dimensions of the parts (82) and (83), and can thus differ during the scraping process, such as is shown with the blade ends (87),. individually bend and separately brought under spring load to the respective end face (38) or (55) and scrape them off.

This effect already occurs when, as shown in FIGS. 1 and 2, the scraping block (85) is firmly clamped on the slide (43). However, since the contaminations on the formwork surfaces are of very different types, it may well be desirable to design or attack the individual leaf ends which form the cleaning surfaces (56) and (57) in different ways. This can be done by making the two outer ends of the four outer ends about 0.5 to 1 mm shorter.

Another possibility is a swivel mounting, as shown for example in FIGS. 5 and 6. There the scraping block (85) is designed and held in practically the same way as with the fixed clamping on the tool slide (43). However, the holder is formed here by a swivel body (88) which can be swiveled about a vertical axis (73) in a rotary bearing (89) is mounted on the underside of the tool carriage (43) in a tilt-proof manner. The swivel path is limited in both directions by stop pins (90). From the middle position shown, the cleaning tool can thus be pivoted through an angle of approximately 3 to 8 ° in order to use the cleaning surfaces (56) or (57) more uniformly. As a result, the system forces during the cleaning process are better balanced if the workpiece is not brought to a stop exactly in the specified position. A further improved compensation can easily be achieved by interposing a rubber-elastic body instead of the fixed stop pins (90), possibly surrounding such holding pins with a thick jacket made of rubber or other damping material.

Claims (12)

1. Device for cleaning formwork elements (26) and the like formwork parts, with at least two pairs of conveyor rollers (8-11) arranged transversely to the direction of passage (30), one of which (10,11) can be adjusted against the other (8,9) is provided, and with cleaning elements (31, 32) for the underside (27) and the longitudinal edges (64), characterized in that between two pairs of conveyor rollers (8-11) a cleaning device (36) for cleaning at least one end face (38) of a Formwork element (26) is arranged with an end face cleaner (37) which can be moved through the path of the formwork elements transversely to the direction of conveyance in a conveying pause. 2. Device according to claim 1, characterized by a common end face cleaner (37) for the front and rear end faces of the formwork elements (26). 3. Apparatus according to claim 1 or 2, characterized in that the end face cleaner (37) on a above the track of the formwork elements (26) arranged guide track (41) and is movable by an intermittently effective motorized slide drive (44). 4. Apparatus according to claim 3, characterized in that limit switches (47, 48) for controlling at least the slide drive (44) are provided at in particular both ends of the path of a tool slide (43) holding the end face cleaner (37). 5. Device according to one of claims 1 to 4, characterized in that the end face cleaner (37) has a sandwich scraping block (65) made of scraping blades (61) and interposed plates (63) made of at least limited rubber-like elastic plastic, the side edges of which opposite Stand the ends (66,67) of the scraper blades (61) back. 6. The device according to claim 5, characterized in that the perpendicular and approximately parallel to the conveying direction of the formwork elements "scraping block (65) about a vertical axis (69) over a few angular degrees is held limited adjustable. 7. The device according to claim 6, characterized in that the pivoting angle of the scraping block (65) is limited by stops (70). 8. The device according to claim 6, characterized in that the pivoting angle of the scraping block (65) is limited by an elastically deformable intermediate member relative to a device-fixed bracket. 9. Device according to one of claims 1 to 8, characterized by at least one sensing device (51), in particular two (51,53), for palpating the end face (38,55) of a formwork element (26) in one. Cross-cleaning plane. 10. The device according to claim 9, characterized in that the or each sensing device (51, 53) can be switched off separately and forms the trigger of a sequence control for stopping the conveyor rollers (8-11), performing an end face cleaning process and switching on the conveyor drive again. 11. The device according to claim 9 or 10, characterized in that the or each sensing device has a light barrier (51), the transmitter and receiver, in particular combined as a double element, are arranged above the transport path of the formwork elements (26). 12. The apparatus according to claim 11, characterized in that the transmitter and receiver are arranged at a short distance to the side of the transport path of the formwork elements (26) and a reflector (50) for the scanning beam to the other side of the transport path below a shield (49).

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