Jining Donghong Machinery Co., Ltd

Hydraulic disc brake system consists of three parts: brake actuation mechanism, hydraulic power unit and control system.

These three parts are connected through hydraulic pipeline.

The hydraulic power unit is the hydraulic power supply unit, which provides necessary hydraulic power for the

actuation mechanism;

The control system is the hydraulic power control unit;

The actuation mechanism is the braking actuation unit, which consists of   braking caliper, caliper frame and friction disc, and the braking calipers include normal open service calipers and normal closed safety calipers.

This brake system has the following four functions:

1. Service Brake Through operating the handle of the brake valve, adjust the service caliper’s normal pressure on the friction disc. So

provide adjustable braking torque to the rigs to meet requirements in different working conditions, such as bit feeding, tripping etc.

2. Emergency Brake Under emergency condition, press the Red emergency brake button, the service calipers and safety calipers will all applied to realize emergency stop.

3. Over-winding Protection When the hook is lifted to a certain height with load the service brake should be actuated but not did, due to the

driller’s failure in operation and some other reasons, the over winding or colliding prevention valve will give a signal to the service calipers and safety calipers to realize emergency stop for preventing crown block accident.

4. Parking Brake When the drilling rig will stop working or the driller wants to leave the driller’s station, pulling down the parking brake handle will realize safety calipers braking to prevent the hook from sliding.

In addition, according to customer’s requirements the function of Mistaken Operation Protection can be added. What is called Mistaken Operation Protection is In case that the driller releases parking brake and emergency brake without following requirements of regulations, all braking calipers will come into braking condition to realize safety protection.

A. Brake Actuating Mechanism

1.Drum   2.Friction Disc   3. Service Capiler   4.Capiler Frame   5.Emergency Caplier   6. Mounted Base

A.1 The service caliper consists of mainly normal open single-action cylinder, disc springs, lever and brake pad

A.2 The safety caliper consists of normal closed single-acting oil cylinder, disc spring, lever and brake pad

A.3 The friction disc, which forms the brake pair with brake pad, is one of the core components. Usually, each set of product is

provided with two friction discs, which are mounted on both ends of the drawworks drum.

According to structures, friction discs are classified into three types: water cooling, air cooling and solid discs.

A.4 The caliper frame is the base of the actuating mechanism. The service caliper and the safety caliper are mounted on this base.

Usually, two provided caliper frames are mounted on the base of the drawworks, located in front of both ends of the drum.

B.The hydraulic power unit includes: oil tank assembly, pumps, control block assembly, oil filling assembly and electrical control

box.

C.The control system includes braking valve assembly, parking brake valve assembly, control valve group, pipes and pressure

meters.

Application: Used for drawworks of drilling rig ZJ120，ZJ90，ZJ70，ZJ50，ZJ40，ZJ30，ZJ20，ZJ15，ZJ10 etc.

We provide disc brake parts for 17 models PS120,PS90,PS80,PS75,PS70,PS65,PS50,PS25,PSX50,PSZ65,PSZ75,PS35,PS40,DBS75,DBS65,DBS50,DBS30

Disc Brake parts include:

Disc Brake Part no.: