Abstract:
A mounting device for mounting a guide blade to be mounted in a blade groove of a turbine, where the mounting unit has a clamping unit and a pressing unit. Here, the clamping unit is designed to produce in the blade groove a non-positive connection in a circumferential direction. The pressing unit is arranged behind the clamping unit in the circumferential direction and the pressing unit is supported against the clamping unit in the circumferential direction. The pressing unit is designed to apply a pressing force by means of a pressing piston in an opposite direction to the circumferential direction in a mounting direction and to transmit said force to the guide blade to be mounted.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is the U.S. National Stage of International Application No. PCT/EP2014/069854 filed Sep. 18, 2014, and claims the benefit thereof. The International Application claims the benefit of European Application No. EP13191584 filed Nov. 5, 2013. All of the applications are incorporated by reference herein in their entirety. 
     
    
     FIELD OF INVENTION 
       [0002]    The present invention relates to a mounting device and to a mounting method for mounting a guide vane in a vane slot of a turbine. 
       BACKGROUND OF INVENTION 
       [0003]    In the prior art, it is common for the guide vanes to be moved into their final position in the vane slot of the turbine by means of manually applied hammer blows. This is very demanding in terms of time and force. 
       SUMMARY OF INVENTION 
       [0004]    The present invention is now based on an object of providing a machine for this procedure. 
         [0005]    Said object is achieved by way of a mounting device, and a mounting method as per the independent claims. Advantageous refinements of the invention are specified in the subclaims and described in the description. 
         [0006]    The inventive mounting device for mounting a guide vane, which is to be mounted, in a vane slot of a turbine comprises a jamming unit and a caulking unit. In that context, the jamming unit is designed to generate, in the vane slot, a force fit in a circumferential direction. The caulking unit is arranged behind the jamming unit in the circumferential direction and the caulking unit bears against the jamming unit in the circumferential direction. The caulking unit is designed to apply, by means of a caulking piston, a caulking force in a mounting direction opposite to the circumferential direction, and to transmit this force to the guide vane which is to be mounted. 
         [0007]    The mounting device according to the invention advantageously makes it possible to simplify and speed up the mounting of the guide vanes. This makes it possible to save costs and working time. 
         [0008]    In one advantageous configuration of the mounting device according to the invention, the jamming unit comprises a jamming piston which is provided with a piston bevel and can be moved in a jamming direction against a fork bevel of a jamming fork. 
         [0009]    This configuration makes it simple to produce a force fit between the mounting device and the turbine. The arrangement of the jamming piston in the fork also ensures that the vane slot cannot be damaged by the movement of the jamming piston. 
         [0010]    In a further advantageous embodiment of the mounting device according to the invention, the jamming unit is fluidically driven. Additionally, in another advantageous embodiment, the caulking unit is fluidically driven. In that context, fluidically encompasses hydraulic or pneumatic drive types. 
         [0011]    Thus, the mounting device can be driven by means of common fluid assemblies, as are frequently encountered in production plants. 
         [0012]    In a further advantageous embodiment of the mounting device according to the invention, the caulking piston is provided with an endstop part. 
         [0013]    The arrangement of the endstop part on the caulking piston simplifies handling of the mounting device according to the invention, since it is not additionally necessary to hold the endstop part in position. 
         [0014]    In the mounting method according to the invention, a guide vane, which is to be mounted, is secured in a vane slot of a turbine in that the guide vane, which is to be mounted, is driven, by means of a mounting device according to the invention, along the vane slot in the mounting direction, to a point provided with a caulking piece. The guide vane is, as ever, fixed by means of the caulking piece. 
         [0015]    The mounting method according to the invention is quicker and easier for the installer than mounting methods used hitherto for the same purpose. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0016]    Exemplary embodiments of the invention will be discussed in more detail on the basis of the drawings and the following description. In the figures: 
           [0017]      FIG. 1  shows a mounting device according to the invention, 
           [0018]      FIG. 2  shows a jamming unit of the mounting device, and 
           [0019]      FIG. 3  shows a mounting method according to the invention. 
       
    
    
     DETAILED DESCRIPTION OF INVENTION 
       [0020]      FIG. 1  shows, in an exemplary configuration, a mounting device  10 , according to the invention, for mounting a guide vane  34  which is to be mounted. The mounting device  10  according to the invention comprises a jamming unit  11  and a caulking unit  12 . The jamming unit  11  is shown schematically, in an exemplary configuration in  FIG. 2 , in a working position.  FIG. 3  shows the mounting device  10  according to the invention in the working position, by way of example while carrying out the mounting method  40  according to the invention. 
         [0021]    According to the invention, the jamming unit  11  is designed such that the jamming unit  11  is able to generate, in a vane slot  32 , of a turbine  31 , for mounting the guide vane  34  which is to be mounted, a force fit in a circumferential direction  24 . In that context, the circumferential direction  24  is a direction which, in the working position of the mounting device  10 , encircles perpendicular to an axis of rotation  30  of the turbine  31 , at a constant distance around the axis of rotation  30 . Thus, the circumferential direction  24  corresponds to the profile of the vane slot  32 . 
         [0022]    According to the invention, the caulking unit  12  is arranged behind the jamming unit  11  in the circumferential direction  24 . Thus, the caulking unit  12  bears against the jamming unit  11  in the circumferential direction  24 . It is possible to establish a form fit in the circumferential direction  24  between the jamming unit  11  and the caulking unit  12 . It is also possible for the jamming unit  11  and the caulking unit  12  to have a common housing by means of which this bearing is effected. 
         [0023]    According to the invention, the caulking unit  12  has a caulking piston  15  and is constructed such that the caulking unit  12  is able, by means of the caulking piston  15 , to apply a caulking force in a mounting direction  16 . In that context, the mounting direction  16  is oriented counter to the circumferential direction  24 . 
         [0024]    In particular, the jamming unit  11  and/or the caulking unit  12  are fluidically driven. They may be pneumatically or hydraulically driven. The caulking piston  15  of the caulking unit is in particular a pneumatic piston of a pneumatic cylinder or a hydraulic piston of a hydraulic cylinder. In  FIG. 1 , the mounting device according to the invention is connected via supply lines  14  to a fluid assembly  13 , which generates the fluid pressures or, as the case may be, reduced pressures which are necessary for operation of the mounting device  10 . The fluid assembly  13  and the supply lines  14  can also form part of the mounting device  10 . 
         [0025]    In  FIG. 1 , an endstop part  17  is arranged in front of the caulking piston  15  in the mounting direction  16 . The endstop part consists of a material which is softer than the guide vane  34  which is to be mounted, so as not to damage the guide vane. 
         [0026]    The endstop part is in particular made of bronze, brass or copper. The endstop part  17  can also form part of the mounting device  10  and be securely connected to the caulking piston  15 . 
         [0027]    In order to produce the force fit in the circumferential direction, the jamming unit  11  is in particular provided with a jamming piston  19  and a jamming fork  18 . In that context, the jamming fork  18  has at least one upper fork arm  21  with a fork bevel  25 . In the configuration shown in  FIG. 2 , the jamming fork  18  also has a lower fork arm  22 . In this context, the jamming piston  19  is guided between the upper fork arm  21  and the lower fork arm  22 . Here, the jamming piston  19  is arranged displaceably. Here, the jamming piston  19  can be moved in a jamming direction  23  and counter to the jamming direction  23 . 
         [0028]    In particular, the jamming piston has a piston bevel  20 . The piston bevel  20  bears in particular against the fork bevel  25 . When the jamming piston  19  is moved in the jamming direction  23 , the fork bevel  25  is pushed transversely with respect to the jamming direction  23 . In  FIG. 2 , when the jamming piston  19  is moved in the jamming direction  23 , the upper fork arm  21  is urged in the pressing direction  26 . In the working position, this presses the upper fork arm  21  against a wall of the vane slot  32 . 
         [0029]    In the working position of the mounting device  10  according to the invention, the jamming direction  23  runs radially with respect to the axis of rotation  30 . The caulking direction  26  runs transversely with respect to the jamming direction  23  and essentially parallel to the axis of rotation  30 . 
         [0030]    The jamming piston  19  is in particular a pneumatic piston of a pneumatic cylinder or a hydraulic piston of a hydraulic cylinder. 
         [0031]    In the examples shown in  FIGS. 2 and 3 , the vane slot  32  has an axial caulking groove  35  arranged in a projection  39  and a radial caulking groove  37 . The configuration of the vane slot  32  shown here thus corresponds to the routine manner. The axial caulking groove  35  is provided for the purpose of inserting an axial caulking piece  36  and the radial caulking groove  37  is provided for the purpose of inserting a radial caulking piece  38 . By virtue of the fact that the axial caulking piece  36  is oversized, a guide vane  33  positioned at this point is fixed in the vane slot  32 . The purpose of the mounting method  40  according to the invention is to move the guide vane  34 , which is to be mounted, to the point in the vane slot  32  with the inserted caulking pieces  36 ,  38 . 
         [0032]      FIG. 3  illustrates the mounting method  40  according to the invention. In the mounting method  40  according to the invention, the guide vane  34 , which is to be mounted, is secured in the vane slot  32  of the turbine  31 . 
         [0033]    In the situation shown, two guide vanes  33  are already in their end position in the vane slot  32 . The guide vane  34  which is to be mounted is to be pushed in the direction of the already-mounted guide vanes  33 . In the final position of the yet to be mounted guide vane  34 , the caulking pieces  36  and  38  have in this case already been inserted. This is where the mounting method  40  according to the invention comes in, and the guide vane  34  which is to be mounted is driven by means of the mounting device  10  along the vane slot  32 , in the mounting direction  16 . 
         [0034]    In the illustration, the mounting device  10 , and possibly the endstop part  17 , have already been moved into the working position. First, the jamming unit  11  is used to create, in the circumferential direction, a force fit between the mounting device  10  and the vane slot  32 , in particular by extending the jamming piston  19  in the jamming direction  23 . Once the force fit is established, then the caulking piston  15  is actuated and exerts a force in the mounting direction  16 . The endstop part  17  is arranged between the caulking piston  15  and the guide vane  34  which is to be mounted. The endstop part  17  transmits the force, applied by the caulking piston  15 , in the mounting direction  16  to the guide vane  34  which is to be mounted and thus pushes the latter in the direction of its final position. 
         [0035]    Although the invention has been described and illustrated in more detail by way of the preferred exemplary embodiment, the invention is not restricted by the disclosed examples and other variations can be derived herefrom by a person skilled in the art without departing from the scope of protection of the invention.