Variable-diameter guide bushing device for drilling equipment, for changing the drilling tool

Abstract

The present invention relates to a variable-diameter guide bushing device for drilling equipment, for changing the bits or tricones of the drill strings, replacing the guide bushing that is commonly found at the drilling deck. The guide bushing device has a diameter that is variable at will, such that it enables the drill bit of the drill string to be changed with ease.

1 . A guide bushing device for changing the drill bits or tricones of the drilling strings, wherein said equipment comprises:
 a) An upper surface that has an outer segment and an inner segment that has a diameter which is variable at will; An upper covering ring element is arranged in said outer segment; In said interior segment there is an upper covering element that retains water from entering the device; On said upper surface there is also a set of nozzle elements into which a cleaning fluid can be injected; a set of fixing bolts that fix said upper surface with a lower surface of the device; On said upper surface there is also a support and fixing element to the drilling machine;   b) A central body that inside houses a structure of drum or roller elements which is in contact with the drilling bar, said roller elements comprising a set of bearing elements with a set of axis elements that are arranged through said bearing elements for the rotation of said drums, said drums also comprising a rotation arm element that is arranged in the bottom part of said drum and an arm shaft member which is attached to said swing arm member to allow rotation of the drums; said drums also comprising a set of cover elements and retainers, insurance elements and sealing rings that restrict contamination inside said roller elements; The central body also comprising a set of lower and upper cams with pin elements that guide the movement of the drum or roller structure; said central body also comprising a set of upper and lower covers that holds said set of cams; a cylinder element arranged with a base, a trigger element and spacer elements that exert rotational torque to move the set of cams; a set of insurance elements to prevent axial movements of the central body; There is also an adjusting element that determines and adjusts the distance between said upper and lower covers; said central body wherein said roller arm axis element comprising a vertical spacer element for maintaining the height of the roller arm; In the central body there is also a cavity or lubrication element to introduce lubrication fluids to the device; and   c) A lower surface that has an outer segment and an inner segment that has a diameter which is variable at will; A lower ring covering element arranged on said lower surface in the outer segment; In said interior segment there is a lower covering element that retains water from entering the device; On said lower surface there is also a set of fixing bolts that fix said lower surface with said upper surface of the device.   
     
     
         2 . The guide bushing device for changing the drill bits or tricones of the drilling strings of  claim 1 , wherein said upper and lower surface elements are configured to receive the drilling string, and in a drilling mode said surfaces have the diameter that corresponds to said string, and in the a mode of changing a drill bit said surfaces are capable of changing their diameter at will to a diameter greater than that of the drill bit so that said drill bit is capable of passing across the entire device. 
     
     
         3 . The guide bushing device for changing the drill bits or tricones of the drilling strings of  claim 1 , wherein said structure of drum or roller elements of said central body is integral and configures an initial diameter that is equal to that of the drill string when drilling tasks are carried out and a final or change diameter that is at least greater than the diameter of a drill bit, allowing said drill bit to pass through the elements of drums or roller. 
     
     
         4 . The guide bushing device for changing the drill bits or tricones of the drilling strings of  claim 1 , wherein said structure of drum or roller elements can be replaced by a chamber element. which is supported on a rail element and a clamp element, where said elements are in the inner diameter of said central body. 
     
     
         5 . The guide bushing device for changing the drill bits or tricones of the drilling strings of  claim 1 , wherein said structure of drum or roller elements or chamber of said central body is integral and configures an initial diameter which is equal to that of the drilling string when drilling tasks are carried out and a final or change diameter that is at least greater than the diameter of the drilling bit, allowing said bit to pass through the drum or roller elements or chamber. 
     
     
         6 . The guide bushing device for changing the drill bits or tricones of the drilling strings of  claim 4 , wherein said structure of drum or roller elements or chamber of said central body is integral and configures an initial diameter which is equal to that of the drilling string when drilling tasks are carried out and a final or change diameter that is at least greater than the diameter of the drilling bit, allowing said bit to pass through the drum or roller elements or chamber.