Production plant having a protective unit

Abstract

The invention relates to a production installation (1) for bending sheet metal comprising a bending press (3) with press beams (13, 16), a bending tool (4), a tool manipulation unit (30) for the bending tool (4), and a protective unit (29) with a protective element (32) and an adjusting device (33, 44). The protective element (32) of the protective unit (29) can be moved from a protective position which covers the bending tool (4) into a release position which releases the bending tool (4). The adjusting device (33) comprises at least two brackets (37) and at least two holding arms (38), the protective element (32) being mounted on the brackets (37) in an articulated manner by means of the holding arms (38). The adjusting device (44) can also comprise at least two linear guide arrangements (45) each having a plurality of guide rails (46, 47, 48), by means of which the protective element (32) can be displaced between the two positions.

1 . A production installation ( 1 ), in particular for air bending or bottom bending of a workpiece ( 2 ) to be manufactured from a sheet metal, comprising
 a bending press ( 3 ), in particular a press brake, with a machine frame ( 7 ), a lower press beam ( 13 ), an upper press beam ( 16 ) as well as tool holders ( 19 ,  20 ) arranged or formed on the press beams ( 13 ,  16 ),   at least one bending tool ( 4 ) with at least one bending punch ( 5 ) and at least one bending die ( 6 ),   a tool manipulation unit ( 30 ) for moving the bending tool ( 4 ) between the tool holders ( 19 ,  20 ) and a tool storage ( 31 ) or for changing the position of the bending tool ( 4 ) relative to the tool holders ( 19 ,  20 ),   a protective unit ( 29 ) with at least one protective element ( 32 ) and an adjusting device ( 33 ,  44 ), by means of which adjusting device ( 33 ,  44 ) the at least one protective element ( 32 ) can be displaced relative to the bending press ( 3 ) from a protective position which at least sectionally covers the bending tool ( 4 ) into a release position which at least sectionally releases the bending tool ( 4 ), and the at least one protective element ( 32 ) is plate-shaped and comprises a first longitudinal edge ( 34 ) as well as a second longitudinal edge ( 35 ) and a width ( 36 ) of the protective element ( 32 ) is defined by the two longitudinal edges ( 34 ,  35 ), and wherein the protective unit ( 29 ) is arranged in a feed region in front of the bending press ( 3 ),   
       wherein
 either the adjusting device ( 33 ) comprises at least two brackets ( 37 ) and at least two holding arms ( 38 ) each having a first end region ( 39 ) and a second end region ( 40 ), and the holding arms ( 38 ) each being mounted on the brackets ( 37 ) in an articulated manner with their first end regions ( 39 ) and the holding arms ( 38 ) each being connected to the at least one protective element ( 32 ) on its first longitudinal edge ( 34 ) facing away from the first press beam ( 13 ) in an articulated manner with their second end regions ( 40 ), and the at least two brackets ( 37 ) being arranged at a distance from one another in the direction of the longitudinal extent of the at least one protective element ( 32 ), 
 or the adjusting device ( 44 ) comprises at least two linear guide arrangements ( 45 ), and each of the linear guide arrangements ( 45 ) comprises a first guide rail ( 46 ) and a second guide rail ( 47 ) and at least one further guide rail ( 48 ), and the first guide rails ( 46 ) are each arranged stationarily on the bending press ( 3 ), and each of the at least one further guide rails ( 48 ) is mounted on the at least one protective element ( 32 ), and the at least two linear guide arrangements ( 45 ) are arranged at a distance from one another in the direction of the longitudinal extent of the at least one protective element ( 32 ). 
 
     
     
         2 . The production installation ( 1 ) according to  claim 1 , wherein the protective unit ( 29 ), in particular its brackets ( 37 ) or its first guide rails ( 46 ), is held on the upper press beam ( 16 ). 
     
     
         3 . The production installation ( 1 ) according to  claim 1 , wherein the width ( 36 ) of the at least one protective element ( 32 ) between its two longitudinal edges ( 34 ,  35 ) corresponds to an opening width between the tool holders ( 19 ,  20 ) of the completely open bending tool ( 4 ). 
     
     
         4 . The production installation ( 1 ) according to  claim 1 , wherein the at least two holding arms ( 38 ) are pivotable between the protective position and the release position of the at least one protective element ( 32 ), each by a pivot angle with a value selected from an angle range with a lower limit of 150° and an upper limit of 200°, in particular 180°. 
     
     
         5 . The production installation ( 1 ) according to  claim 1 , wherein a longitudinal extension of the holding arms ( 38 ) each approximately corresponds to the width ( 36 ) of the at least one protective element ( 32 ) between its two longitudinal edges ( 34 ,  35 ). 
     
     
         6 . The production installation ( 1 ) according to  claim 1 , wherein in the release position, the holding arms ( 38 ) each starting out from the brackets ( 37 ) project towards the side facing away from the lower press beam ( 13 ) and the at least one protective element ( 32 ) is arranged so as to be suspended on the side of the holding arms ( 38 ) facing away from the upper press beam ( 16 ) as well as in the direction towards the lower press beam ( 13 ). 
     
     
         7 . The production installation ( 1 ) according to  claim 1 , wherein in the protective position, both the holding arms ( 38 ) starting out from the brackets ( 37 ) and the at least one protective element ( 32 ) connected to the holding arms ( 38 ) in an articulated manner comprise a suspended arrangement in the direction towards the lower press beam ( 13 ). 
     
     
         8 . The production installation ( 1 ) according to  claim 1 , wherein the brackets ( 37 ) are arranged on the upper press beam ( 16 ) such that in the protective position and with the bending tool ( 4 ) being completely open, the second longitudinal edge ( 35 ) of the at least one protective element ( 32 ) faces the lower press beam ( 13 ) and the at least one protective element ( 32 ) with its second longitudinal edge ( 35 ) extends at least to the lower tool holder ( 19 ). 
     
     
         9 . The production installation ( 1 ) according to  claim 1 , wherein the at least two brackets ( 37 ) are arranged in an upper end section of the upper press beam ( 16 ). 
     
     
         10 . The production installation ( 1 ) according to  claim 1  wherein at least one actuator and/or damping device ( 43 ) is provided, said at least one actuator and/or damping device ( 43 ) being operatively connected to one of the holding arms ( 38 ). 
     
     
         11 . The production installation ( 1 ) according to  claim 1 , wherein a maximum adjustment track of the at least two linear guide arrangements ( 45 ) is selected such that in the protective position and with the bending tool ( 4 ) being completely open, the second longitudinal edge ( 35 ) of the at least one protective element ( 32 ) faces the lower press beam ( 13 ) and the at least one protective element ( 32 ) with its second longitudinal edge ( 35 ) extends at least to the lower tool holder ( 19 ). 
     
     
         12 . The production installation ( 1 ) according to  claim 1 , wherein the at least two linear guide arrangements ( 45 ) are held on the upper press beam ( 16 ) in vertical orientation. 
     
     
         13 . The production installation ( 1 ) according to  claim 1 , wherein at least one drive element ( 49 ) is provided on at least one of the linear guide arrangements ( 45 ). 
     
     
         14 . The production installation ( 1 ) according to  claim 13 , wherein one of the drive elements ( 49 ) is provided between the first guide rail ( 46 ) and the second guide rail ( 47 ). 
     
     
         15 . The production installation ( 1 ) according to  claim 13 , wherein one of the drive elements ( 49 ) is provided between the second guide rail ( 47 ) and the at least one further guide rail ( 48 ). 
     
     
         16 . The production installation ( 1 ) according to one  claim 1 , wherein at least one actuator and/or damping device ( 43 ) is provided, said at least one actuator and/or damping device ( 43 ) being operatively connected to the at least one protective element ( 32 ).