SECTIONAL CORE RECEIVER AND DEVICE FOR CUTTING AND CORE RETENTION AT DEVELOPMENT OF SAID CORE RECEIVER Russian patent published in 2015 - IPC E21B25/00 E21B25/10 

FIELD: mining.

SUBSTANCE: set of inventions relates to core withdrawal devices. Claimed core receiver comprises suspension at upper part, core separator at lower part and pipe sections. Core separator comprises the case and sleeve coupled with the case upper part. Said case houses the set of core catchers. Pipe sections are provided with sleeved at upper part and interconnected and connected with core separator by bayonet joints. Every bayonet joint comprises retainer, two bosses and two shaped grooves to interact with said bosses. Said retainer locks the bayonet joint in closed position. Both bosses are shaped to rectangular ledges in the groove at the section lower part. Shaped grooves are made in the sleeve wall from its lower end. Every shaped groove comprises a through horizontal element with vertical element abutting thereon at the right angle from one side and with the extra through vertical element from the opposite side. Said vertical element is composed of a recess made on the sleeve wall inner surface. Each of said two bosses at bayonet joint working position interacts with one of said extra two through vertical grooves. Groove is made from the sleeve top end and two grooves are made at top end. Said retainer is composed of a split ring of elastically straining material. Said retainer is arranged between bore ledge at the section lower part and the sleeve top end. Three ledges are made at the retainer lower end to interact with the sleeve bore. The device incorporates a section gripper composed by the branch pipe. The gripper lower part has the bore with two bosses for connection with the section sleeve. Gripper top part comprises the elements for connection with load-lifting device. Core cutting and retention device at disassembly of section core receiver comprises top and bottom yokes and cutting and retention assembly arranged between the latter. Said yokes consist of articulated bodies and flaps to be locked as-closed by detachable pins. Top yoke interacts with the lower part of detachable section of core receiver. Bottom yoke interacts with the lower part of core receiver fixed section. Top yoke body has two grooves interacting with the bosses located at the bore at detachable section lower part. Core cutting and retention assembly consists of articulated with the body and flaps. The body is rigidly connected with the bodies of said yokes. Plate blade is secured at the flap while arched blade is secured in the same plane. Core cutting and retention assembly as-closed allows the closure of blades and through hole. Said body and flap as-closed are locked by detachable screw joint. Said body and flap at displacement from open to closed position interact with detachable drive mechanism. The latter is composed of the stud with nut and flywheels. Stud end has L.H. and R.H. thread.

EFFECT: higher reliability and safety, lower labour input.

2 cl, 12 dwg