FI101687B - Device for surface treatment - Google Patents

Description

101687

The invention relates to an apparatus for surface treatment, and in particular to an apparatus suitable for use in rehabilitating conductive surfaces, for example cylindrical surfaces or planar surfaces, or other similar surfaces at their place of use and without removing them.

For example, the drying cylinders of a paper machine become dirty and worn in use, and a soiled and unevenly worn jacket surface needs to be repaired from time to time. This may be a simple cleaning sanding or a leveling sanding or more intensive machining followed by sanding to rehabilitate the surface. The problem with on-site refurbishment is, on the one hand, the placement and support of the machining device between the cylinders and, on the other hand, the control of the 20 devices during machining. It is common practice today for machining equipment to be run along guides erected between rollers. In order not to have to install the frame and guide structures separately for machining, solutions have been developed in which the machining device is supported on the surface to be machined on the one hand and on some other available guide surfaces on the other hand, usually on the adjacent second cylinder surface.

One such solution is known from patent application WO 30 87/02281, which discloses a device to be placed between cylinders, the body of which is supported on the one hand against a cylinder to be machined and on the other hand against another cylinder. The support means have rotating balls, roller wheels or sliding pieces, so that the device can move in support of the cylinders and the cylinders can in principle also rotate during machining. A machining tool, such as a grinder, is attached to the frame from a movable body, and the machining is controlled by controlling the position and movement of the machine tool relative to the body. The problem with this solution is that the irregularities and deformations of the abutment surfaces impede the movement of the device 5 and, on the other hand, make machining difficult and deteriorate, despite attempts to prevent this by providing at least some of the support means with flexibility.

SE 501250, on the other hand, discloses a device for machining cylinders, which has a tripod against the cylinder surface to be machined by means of rollers or the like and a pressure plate adapted to the shape of the second cylinder by means of pressure cylinders. The tool, the 15-tool tool blade, is movably attached to a tripod. When using the device, the pressure plate is pressed against the stationary second cylinder and the cylinder to be machined is rotated. Machining can be performed at only one location at a time by controlling the movable work tool in an area where it can move in a stationary stationary position. Another disadvantage of the device is that the machining tool is placed in relation to a stand, which, supported by the rollers, follows the surface to be machined and thus also its irregularities and shape defects.

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U.S. Pat. No. 2,942,385, on the other hand, discloses a machining device which may have one or more abutment abutment surfaces and grooves therein in which a pressure medium is introduced so that a weight compensating pressure is provided between the abutment surface and the abutment surface and the abutment surface can be easily moved. surfaces. This allows the machine tool to be easily moved on the abutment surface or surfaces. No solution is presented for machine tool control.

35 3 101687

The object of the invention is to provide a device for surface treatment which avoids the disadvantages of the above-mentioned known solutions and which can be used in various ways for the repair and treatment of various surfaces, in particular on site.

To achieve this object, a surface treatment device according to the invention comprising a body, machining means attached to the body and a plurality of support members attached to the body comprising a support surface coming into and / or adapted to a surface to be machined and adapted to form an air or liquid cushion and between the abutment surface, is characterized in that it includes adjustable means for controlling at least some support member in the attachment of the support member to the body in order to adjust the position of said abutment surface relative to the frame.

The device further preferably comprises control means connected to the control means for providing control to the control means.

The device further preferably comprises means for moving the device along the surface to be machined, and in a further developed form further means for registering the position of the device and controlling the movement.

In one advanced embodiment, the device includes programmable control means coupled to the means for adjusting the support members and registering the position of the device to the control means for controlling the movement of the device and the position of the support surfaces relative to the frame according to programming.

35 4 101687

An advantage of the device according to the invention over known devices is, firstly, that the device is easily movable due to the air or liquid cushions arranged between the surface parts of the support members and the support surface. Due to the air-5 or the liquid pad, and since the support surfaces are relatively large in the preferred embodiment, the device does not follow small irregularities or shape defects or disturbing vibrations of the surface to be machined or the abutment surface. Grinding or other machining can be performed on top of the damaged 10 pieces. Compared to current solutions, the work can then in many cases be started very quickly by first installing the measuring equipment and then making a repair program, after which the work can be started. The device according to the invention can also be driven on a very dirty or otherwise poor condition surface. In this case, the worst dirt and unevenness can be removed quickly in the renovation work first, and then a program can be made for the final renovation. The support surfaces can be arranged relative to the body of the device so that the body extends beyond the support members at the ends of the device 20, whereby the machining device is able to perform machining up to the edges of the surface to be repaired. When the support means can be provided with adjusting means as required and the device is provided with the necessary control means, a device is obtained with which the machining can be controlled mainly by controlling the movement of the frame. If the surface to be machined is to be repaired in one direction, the device is guided to follow the line that carries out the repair. The control of the machine tools can be easily added to the control. In-situ refurbishment of a guide surface or other similar surface 30 generally requires a solution tailored to it in some way. The implementation and operation of the device according to the invention are such that a device suitable for each need can be easily tailored from certain basic components.

35 5 101687

The invention and its various embodiments will be described in more detail below with reference to the accompanying drawings, in which: Figure 1 schematically shows an embodiment of a device according to the invention, Figure 2 schematically shows another embodiment of a device according to the invention, Figure 3 shows a possible embodiment of a device support Fig. 4 schematically shows a possible embodiment of the support means adjusting means in a sectional front view, Fig. 5 is a sectional view of the adjusting means in a side view at 20 and point AA in Fig. 4, Fig. 6 shows a possible embodiment of the support member in a simplified and schematic sectional view. Fig. 7 schematically shows a bottom view of a possible implementation of the support member, Fig. 8 shows a part of the device according to the invention shown in Fig. 1. Fig. 9 schematically shows the embodiment of the device according to the invention shown in Fig. 1 with control and accessories applied to the refurbishment of paper machine rolls 35 and 6. 101687 Figs. 10 (a) and 10 (b) show another embodiment of the device according to the invention.

Figure 1 schematically shows an embodiment of a device 5 according to the invention for repairing rolls of a paper machine. The device is placed between the rollers T1, T2 and T3. The device has a body 1 for such applications and projections 2 extending therefrom between the rollers, to which support means 11, 12, 13, 14, 15 and 16 resting against different roll surfaces are fastened as shown in Fig. 5. in a manner preferably at the same time as adjusting means by means of which the position of the support means relative to the frame 1 can be controlled. The support surfaces 20 of the support means, which are shaped to conform to the respective cylinder surfaces, come into contact with the roller surfaces T1, T2 and T3 acting as the counter pin-15. In the device according to the invention, it is essential that air 20 or a liquid, such as water or cutting fluid, is introduced between the bearing surface of the support members and the abutment surface at a suitable pressure. This allows the device to move lightly and stably on the abutment surfaces. If the abutment surface is uneven, a thin damper, for example, can be placed on top of it, making it easier to control the movement and adjustment of the device.

·. The base body 1 of the device may be standard in such applications, but both the projections 2 and the support means to be attached to them usually have to be tailored to the object to be machined. On the other hand, for example, standard dimensions are used in the rolls of paper machines, and thus the same equipment configuration can be used for many purposes. road rehabilitation.

The working tool in this embodiment is a grinding carriage, which is shown schematically and in a simplified manner in Fig. 1. The body 3 of the grinding carriage is attached to the body 1 of the device. The grinding belt 7 is rotated by a traction wheel 4, and the belt 7 101687 rotates through the other two wheels 5 and 6. In this case, the device is used to grind the roller surface T3. The structure and operation of the grinding carriage will be described in more detail below with reference to Figure 8.

5

Figure 2 shows an embodiment of a device according to the invention for the simultaneous cleaning grinding of several rollers. The device is otherwise similar to the device shown in Fig. 1, but it also has two other grinding carriages for grinding the roller surfaces T1 and T2 attached to the respective projections 2 of the body 1. The grinding sleds are completely identical to the grinding sled shown in Fig. 1, and the same parts thereof are indicated in the figures by the same reference numerals.

15

In the following, a possible implementation of the support member and its mounting and adjusting part will be explained in more detail with reference to Figs. 3 to 7. Fig. 3 schematically shows the support member 11 seen from the front and at the left end in a sectional view 20 to illustrate some details. It is advantageous to make the support members large enough to allow the support surfaces to support the device on the air or liquid cushions to be formed under them. Air, water or cutting fluid, or other suitable fluid, for example, may be introduced between the support surface 20 of the support member and the abutment surface on which said support member 25 rests to form a pad as indicated by the arrows in Figure 3. At the same time, air or liquid can be used to cool the surface.

• The support member 11 of Fig. 3 has an elongated shape and is fixed to the projections 2 of the body by fixing and adjusting parts 18, respectively, close to each end. By means of the adjusting parts 18, the distance between the support member 11 and the projection 8 101687 2 can be adjusted as illustrated by the arrows marked 35 next to them. The adjustment is effected by means of stepper motors 25 which are controlled by the connection 26.

Figures 4 and 5 show in more detail a possible implementation of the adjustment means-5. The cylindrical part 18 is fitted in a corresponding opening in the projection 2. At its upper end there are cross recesses 35 and 36, the latter of which has a shaft 31 supported and mounted on the protrusion 2 at points 32 and 33. An eccentric 34 is fixed to the shaft 35 10. As it rotates clockwise (Fig. 5), the eccentric 18 slides against the base 37 downwards and the support member 11 away from the projection 2. As it rotates counterclockwise, the eccentric allows the part 18 to slide upwards, and in this direction the part 18 is moved by the pressure acting on the tongue. The shaft is rotated by a stepper motor 25 (Fig. 3), to which the introduced control determines the position of the eccentric 34 and thus the adjusting part 18. At the lower end of the support member 18, a chamber 38 is arranged, to which a channel 39 leads. By means of the liquid or air introduced into the chamber, a fine adjustment or resilience 20 can be provided, which improves the operation of the support member. It should be noted that the adjustments required are usually very small, in the order of less than a millimeter or a few millimeters, and at most in the order of ten millimeters.

25

In the following, the structure of the support member with which the air or liquid cushion is arranged below the support surface will be explained in more detail with reference to Figs. 3, 6 and 7. The support surface 20 is preferably divided into several parts or 30 areas 41 as shown in Fig. 7, each of which has its own unit 24 as shown in Fig. 3. The idea is that the pressure or amount of air or liquid can then be adjusted separately in different areas. fit. Of course, individually adjustable areas can also be formed in the width-35 direction of the support member. The support surface 20 has a plurality of extensions 27 in each region 41, each of which has an air or fluid passage 23 from the joint 24 facing the region. The purpose of the extensions is to enhance the formation of the air or fluid cushion.

Figures 3 and 6 illustrate a preferred embodiment of the support member in that it has a body part 22 and a surface part 21 removably attached thereto, on which a suitable surface 20 with extensions 27 is formed and further channels 23 connecting the extensions 10 27 of each region 41 together 24. The body part 22 may be, for example, aluminum and the surface part 21, for example, of a suitable plastic material. Suitable materials are all suitable metals, plastics or composite materials.

15 It can be seen from Figure 3 that a flexible edge, for example a rubber, 28 is placed around the support member. This is especially necessary if a liquid is used to form the pad. The rim acts as a seal at the edges of the support member and promotes the formation of a pad and prevents the liquid 20 from splashing when it is fed under pressure below the support surface. The liquid leaving below the support surface accumulates in the space 29 formed in the rim 28, in which a suction can be arranged to remove the liquid as controlled as possible.

Figure 8 shows the top of the device of Figures 1 or 2 from the front, seen from the side of the support member 12, and illustrates in particular one possible implementation of the grinding carriage and its operation. The support surface 20 of the support member 12 faces the viewer, and behind it is a support member 11 fixed to the projections 2 of the run-30 by fastening and adjusting parts 18. The body 3 of the grinding wheel consists of a support arm extending to the outer wheel 6 and the device body 1. from the attaching part supporting the traction wheel 4 and the third wheel 5. The drive motor 8 rotates the traction wheel 35 4 and thus the belt 7 on the wheels 4, 5 and 6.

The grinding carriage is able to move in the longitudinal direction of the device 10 101687 along the guides 46. The movement takes place by means of ball screws 42, which are driven by the drive motor 9 by means of gears 43 and a toothed belt 44. As can be seen from the figure, the support members 11 and 12 and the attachment and movement of the sanding carriage are arranged so that the sanding carriage can move beyond the extent of the support members. This allows the entire surface up to the edges to be treated while the support members remain in the surface area. The sanding carriage may also be provided with means for adjusting the tension of the belt 10, as well as means for guiding the sanding belt with respect to the surface to be repaired and the body of the device.

The grinding carriage can vary within the scope of the invention in many ways. There may be several wheels guiding the sanding belt, for example arranged in such a way that two wheels close to each other press against the surface to be sanded against the sanding belt, whereby grinding is performed by a part of the belt tensioned between these wheels. Finishing grinding can be performed with an abrasive belt, if necessary, in which case the belt is placed on one wheel or reel and driven from it to another reel when grinding. The belt can then also be guided through several wheels and can be used to grind several surfaces at the same time.

25

Figure 9 schematically shows a device according to the invention with control and auxiliary devices applied to the repair of rolls of a paper machine, the device being arranged between the rolls as shown in Figures 1 or 2. The device 50 schematically shown here is moved by rollers,. of which only T1 and T2 are shown here, on the support members, of which the supports 11, 12, 15 and 16 are shown schematically in the figure. The device is provided with a grinding carriage 9. The device can be moved by means of a toothed belt 35 attached thereto. The toothed belt is driven by a stepper motor 57, and the belt passes through folding and tensioning wheels 58. With the help of the step 11 101687 motor and its control, the longitudinal position of the device can be precisely set and determined. Reference numeral 67 denotes in the figure the body of a paper machine, and reference numeral 66 denotes a subframe supported on a support-5 beam 64. For controlling the device, the arrangement includes a laser transmitter 52 and a receiver 53, by means of which a so-called zero line 54. The device accordingly has a measuring unit 55 which measures the travel line of the device with respect to the set zero line. The operation of the device and the entire arrangement is controlled by a computer or programmable logic 51. Power and data are supplied to the device by wires via a cable arrangement 56. The wire and cable arrangement 56 is connected to a terminal carriage 65 which moves on a support beam 64 supported at the same rate as the terminal carriage 15. Hoses required for pneumatically or hydraulically operated parts of the device can be provided in the same connection. The connections from the terminal carriage 65 are further routed to the device 50. The figure also shows a section! a coolant collection basin 60, which may be, for example, a tarpaulin tensioned on wires. The pump 61 transfers the liquid through the filter 62 and the piping 63 back to the rehabilitation device 50.

Next, it will be shown how the device 25 according to the invention can be used and controlled in the application shown in Figs. 1 and 9, in which the device performs smoothing grinding of the roll surface T3. Before starting the renovation, the so-called T3 is applied to the surface. zero line. The zero line is taken to be a straight line 30 between the centers of rotation of the support bearings of the roll T3, which can be set, as in Fig. 9, by a laser beam 54 passing through a measuring unit 55 in the device. Next, the distance of the zero line from the plane of the surface to be repaired at both ends of the surface is determined. The line of travel of the device is then determined, i.e., the position of the device relative to the zero line is measured as it is run from end to end of the roll. The idea is that the device is first driven along the roll surface T1 on the support track 14 and 15 so that these are not adjusted. When grinding, the path of the device without adjustment is thus generally known, and the device 5 is guided on the one hand by the support members 14 and 15 mainly vertically and by the support members 1 and 12 laterally by adjusting the position of their support surfaces 20 relative to the device body. The aim of the adjustment is, on the one hand, to make the device follow the zero line as well as possible and, on the other hand, to keep it as well as possible in the direction of the zero line. As stated above, the sanding carriage is also preferably provided with means by which the sanding belt can be guided relative to the surface to be repaired. In addition, the device preferably has measuring means 15 which measure the distance from the surface to be repaired, for example by so-called three-point measurement. When the distance of the body of the device and the measuring means from the zero line is known and, on the other hand, the distance measured by the measuring means from the surface to be repaired, the repair can be controlled so that the surface is precisely desired.

The device according to the invention and its use may vary in connection with the applications described above. For example, in the case illustrated in Figure 2, where cleaning grinding of several roller surfaces is performed simultaneously, precise control is not required to operate the device, but it is sufficient that all the abrasive belts are guided against the surfaces to be cleaned. When repairing rollers with arrangements such as those described above, it is essential that the roll to be repaired must rotate. Other rollers may rotate or be stationary depending on the application. The device can perform flap grinding of the roll in a manner different from normal flap grinding, so that the roll to be ground is rotated at a high speed, for example at a surface speed of 100 m / min, from the position of the grinding belt. When rehabilitating grooved t 10 1387 grooves, lathe blades can be placed in the machine to repair the grooves.

Figures 10 (a) and 10 (b) show an example of another embodiment of the device according to the invention. It restores the guide surface 88 of the beam 85 supported on the floor 87 by a stand 86. The support members 73 rest therein on the floor surface and are fixed to the parts 72 of the frame 71 by fixing and adjusting parts 74 controlled by stepper motors 75.

The grinding device consisting of the body 79, the grinding head 77, the grinding means 78 and the electric motor 80 rotating the grinding head is controlled by a stepper motor 82 and a screw 81. The device may include measuring devices and control devices, which, however, for simplicity are not included in this description.

The device according to the invention can be advantageously applied to numerous objects, especially when it is necessary to renovate various surfaces on site, for example in connection with periodic maintenance of massive industrial and energy production equipment. One application may be, for example, the distribution surfaces of power plants, the renovation of which by traditional methods is very laborious. The surface to be renovated can be, for example, tens of 25 meters long, and for the renovation of such a device can be • · customized several meters long, which runs, for example, on the floor as shown in Fig. 10. When refurbishing the conductor surfaces, the device can, for example, rest only on the conductor surface itself or in addition on other surfaces of the conductor-30 beam. The device can also be applied - - · for the rehabilitation of vertical surfaces by means of suitable support and guide surfaces and by moving the device suspended on a wire.

35 Device control can vary widely depending on the application. If the device moves on the support surfaces with sufficient accuracy 14 101687, then only a repair program can be implemented with which the repair is carried out. If a correction program alone is not sufficient, the device itself can be controlled along the zero line by means of measuring devices and, in addition, the machining device or 5 devices can also be controlled on the basis of continuous measurements made by the measuring devices. The air or liquid supply used to form the pad can also be programmed either for each support member or, if necessary, separately for each area of the support member. As already stated above, the control can also be simple, at its simplest completely manual.

It will be apparent to one skilled in the art that the implementation of the support members, their attachment and the adjustment means 15 associated with the attachment can vary widely. There may be the number of mounting points required, and there are a large number of options for making the adjustment. The adjustment can be implemented, for example, as a wedge, screw or rack solution, and there are also other options for controlling the adjustment than the stepper motor. The control-20 may include, for example, measurement and sensor solutions and feedback solutions.

In the invention, it is essential that the processing device is implemented to operate on support members and air or liquid pads formed below them, and that the device can be controlled and adjusted relative to these support members and their abutment surfaces by means of adjustment means. The thickness of the air or liquid cushion can vary from a few hundredths of a millimeter to, for example, 2-3 millimeters. The overpressure required in the pads 30 is relatively small. If, for example, in the case illustrated by Y in Figures 10 (a) and 10 (b), the support members are 1 m long and 0.2 m wide, then their total area is 4000 cm2 and an overpressure of 0.1 kp / cm2 would be sufficient to support 400 kg.

The invention may vary within the limits permitted by the appended claims.

35

Claims (4)

15 101687 A device for machining surfaces, comprising: a body (1, 2; 71) and machining means (3, 4, 5, 6, 7; 5 77, 78) attached to the body and a plurality of support members (11, 12, 13) mounted on the body; 14, 15, 16; 73) comprising a support surface (20) abutting the surface to be machined and / or some other abutment surface (T1, T2, T3; 87) and adapted to its shape and means 10 (21, 22, 23, 24 , 27) for forming an air or liquid cushion between said support surface (20) and the abutment surface, characterized in that it comprises: control means (18, 31-39) to be guided in the attachment of at least one support member (11-16) to the body (2). 15 to adjust the position of the support surface (20) relative to the frame (1, 2; 71) according to the control obtained. Device according to claim 1, characterized in that it comprises control means (51, 52, 53, 54, 55) connected to the control means (18) for providing control to the control means. Device according to Claim 1 or 2, characterized in that it comprises means (57, 58, 59) for moving the device * 25 along the surface to be machined. Device according to claim 3, characterized in that it further comprises means (57, 59) for registering the position of the device and controlling the movement. . . Device according to claim 4, characterized in that it comprises programmable control means connected to the control means (25, 26, 18, 31-37) of the support members and to the means (57, 59) for registering and controlling the position of the device, the movement of the device and support members (20) for guiding the position of the support surfaces (20) relative to the frame according to the programming. 16 101687