1.1 Introduction to Disc Brake Device

Hydraulically controlled disc braking is an integrated technology combining hydraulic power, transmission, control, and mechanical actuation. It is a composite braking system equipped with both normally open and normally closed brake calipers. In recent years, hydraulic disc brakes have become standard on drilling rigs and are increasingly being adopted in workover and well-service rigs. Their application has not only overcome the limitations of traditional band brakes—which long restricted advancements in drilling technology—but also improved drilling performance, enhanced working conditions for operators, increased operational safety and reliability, and provided a fundamental key technology for automated and intelligent drilling systems.

1.2 Features of Disc Brakes Compared to Traditional Band Brakes

Capable of performing service braking, parking braking, emergency braking, overwind prevention, and misoperation protection.

Stable braking performance, high torque capacity, and exceptional reliability.

User-friendly operation with minimal effort and ease of maintenance.

Suitable for new rigs and can be retrofitted onto existing equipment.

Simple and quick replacement of brake pads and adjustment of brake clearance.

1.3 Structural Characteristics

The disc brake system consists of three major components: the actuation mechanism, the hydraulic power unit, and the control system.

1.3.1 Actuation Mechanism

Includes:

Service Caliper: Used for drilling, tripping, and overwind protection.

Safety Caliper: Provides parking and overwind emergency braking.

Brake Disc: The rotating member of the brake pair, equipped with cooling water or air passages.

Caliper Support Frame: Supports the brake calipers.

1.3.2 Hydraulic Power Unit

Comprises:

Oil tank assembly

Pump unit

Control valve block assembly

Refilling component

Electrical control cabinet

1.3.3 Control System

The operator station includes:

Brake valve assembly

Parking valve assembly

Control valve group

Piping

Pressure gauges

1.4 Structural Design

Service Caliper: Designed as a normally open type with floating cylinder-lever mechanism and external helical spring return.

Safety Caliper: Functions as a normally closed type with an adjustable floating cylinder and internal disc spring pack for braking; release clearance is adjustable.

A dual-circuit braking system is employed, where both service and safety calipers can independently handle the maximum load of the rig. An interlock mechanism between the two enhances safety and reliability.

Redundant design is adopted throughout the system, including dual hydraulic sources, dual circuits, and multiple protective functions, further improving safety and dependability.

The hydraulic station is constructed as a fully enclosed inner-outer cabinet structure, with the oil tank, valve blocks, and all components housed within the outer enclosure.

The outer cabinet serves as a protective shell, suitable for field operations in oilfield environments.

Ⅱ.Technical Specifications

Main Technical Parameters

 Ⅲ.Parts Diagram of Disc Brake Device

2.1 Hydraulic Power Station Unit (See Attachment)

2.2 Operating System (See Attachment)

2.3 Actuating Mechanism (See Attachment)