crown block

The crown block consists of crown basement, fast-line sheave, dead-line sheave, main sheave, sand-line sheave, drilling line protector and sheaves for hydraulic and air winch, bumper wood for the Crown-O-Matic and guardrail. It’s designed with closed type and open type. The traveling system is divided into 7×6, 6×5, 5×4, and 4×3, which fit to Φ7/8”~Φ1 1/2” drilling lines. The sheave groove conforms to the requirements of API RP 9B. The sheave groove surface is processed with a quenching treatment. The bearing adopts centralized lubrication for convenient operation.

Features

* The drilling line is reeved in parallel.

* The crown frame is made of high strength steel shapes & plates. The lug plate for top drive is provided. The crown block is equipped with metal base plate, handrail, and toeboard. A ladder has an opening.

* A deviation fast-line sheave.

* The sheave cluster is titled to counteract traveling block’s torque. The side plate assembly is faced with derrick man for ease of picking off & suspending elevators.

* The sheave grooves are intermediate frequency quenched so as to improve surface hardness and extend service life of sheaves.

* All sheaves have double-row conical roller bearings and each bearing has individual lubricating channel.

* The rope guard prevents the wire rope from running out of the sheave grooves.

* Equipped with wooden bumper blocks and retainer net.

* Equipped with a gain hole for use in repairing the sheaves cluster.

* Equipped with sand line sheaves and auxiliary sheaves.

* The sheaves and the bearings are interchangeable with those of matching travelling block.

* The crown blocks conform to API 4F 8A/8C.