Thruster brake is a device used to retard the speed of moving machinery and to stop it accurately to the desired position. The braking force is applied to the brake shoes by a pre-stressed comprising spring. The shoes press on the rotating brake drum retarding its speed and finally stop it. The releasing of the brake drum and compressing of the spring is done by thruster.

Introduction

In addition to wide range of applications in mechanical engineering applications, the thruster operated drum brakes are mainly used in material lifting and handling equipment, mainly because their 'Fial-to-safety' designs ensure safety to men and machines in the event of over failure. With the advancement in electricl drives and electronics, the drives have pushed the mechanical systems to high level of operations and demanding safer and reliable braking loads moving at much higher speeds than earlier. Continuous developments in product improvisation and assured quality checks, the thrusters offer compact, reliable yet economical solutions to most of the industrial applications.

Assembly and Function

The two main sub-assemblies of the hydraulic thruster, the electric motor and the hydraulic unit are co-axially assembled form the working unit. In the switched off state (de-energised) the piston is at its lowest position due to external load (as brake spring of the drum brake), and the brake is applied. When energized, the electric motor drives the pump and delivers working fluid under the piston axially in the guided path, and delivers thrust or force required to operate the attached devise (like thruster brake) via the piston rod and the eye-lug attached to it. The working stroke can be steplessly controlled by external load. The thruster is designed for long trouble free service. The motor windings are designed to meet contingencies. The bearings are adequately sized.

• Gentle Application and release of brake without jerks and shocks
• Compact unit
• Constant magnitude
• Self aligned movement
• Low power consumption
• Minimum maintainance
• Easy mounting and dismounting

Introduction

Thruster brake is a device used to retard the speed of moving machinery and to stop it accurately to the desired position. The braking force is applied to the brake shoes by a pre-stressed comprising spring. The shoes press on the rotating brake drum retarding its speed and finally stop it. The releasing of the brake drum and compressing of the spring is done by thruster.

Assembly and Function

A thruster shoe brake has a pair of cast iron shoes which are lined up with friction pads. The shoes are hinged on main arm and side arm of the brake, each of them have a hinge pin fitted in the base. They are connected to each other on top by a tie rod, which is hinged in the main arm and locked to the swivel block in the side arm, by a lock nut. A crank lever is hinged on the main arm and the other end is fixed to the top clevis of the thruster by a hinge pin. A brake spring is fixed on the main arm and is pre-loaded by a locknut on the lever. The pre-tension in this spring decides the braking torque. The thruster is fitted on the base by a hinge pin. When the thruster is not energized, the brake shoes are pressed on the brake drum fitted on the drive motor shaft and hold it under the effect of braking force provided by the spring. In such condition, the brake is applied and the drum cannot rotate. As the piston travels upwards the angle lever turns, pushes the brake rod and compresses the brake spring. Simultaneously, the brake lever on the other side of the wheel (Brake Drum) is retracted. When the first lever reaches the stop on the brake base member the brake lever at the thruster begins to move, releasing the brake drum.

Introduction

For infallible operation of machinery, modern methods are necessary, any machine which requires its motion to be controlled, whether it is a lifting Crane, Hoist, Winch or Mining Haulage today employs an Electro Magnetic Brake, enabling the operator not only to control the motion but also to hold the load at any desired point without danger of falling, merely by release of the starting handle. Electro magnetic Brake is adequate equipment for safer operations of machinery. Electro magnetic Brakes are used when a load must be stopped rapidly to prevent it from rotating. Electro Magnetic Brakes find its use in Paper Mills, Drives of certain textile machines, Sugar Mill Machinery, Rubber Mixing Mills. .

Assembly and Function

The Shoes are of cast iron and other components are of fabricated steel. The lever is hinged on the main arm, which is connected to the side arm through a tie rod, and is stressed by a pre-loaded compression spring. The compression of the spring can be adjusted to set the braking torque to desired value. The brake liner of selected quality material is riveted to the shoes by aluminum rivets. A.C. solenoid with laminated magnetic sheet steel houses a copper magnetizing coil which is impregnated with Class F materials. The plunger which is connected to the lever, is drawn in to the coil, when it is energized with AC source. This loads the spring and releases the brake shoes from the brake drum. When the supply is cut off, the plunger is pulled out of the coil, and spring force clamps the brake shoes on the brake drum and the brake is applied.

Thruster brake is a device used to retard the speed of moving machinery and to stop it accurately to the desired position. The braking force is applied to the brake shoes by a pre-stressed comprising spring. The shoes press on the rotating brake drum retarding its speed and finally stop it. The releasing of the brake drum and compressing of the spring is done by thruster.

Thruster brake is a device used to retard the speed of moving machinery and to stop it accurately to the desired position. The braking force is applied to the brake shoes by a pre-stressed comprising spring. The shoes press on the rotating brake drum retarding its speed and finally stop it. The releasing of the brake drum and compressing of the spring is done by thruster.

Introduction

In addition to wide range of applications in mechanical engineering applications, the thruster operated drum brakes are mainly used in material lifting and handling equipment, mainly because their 'Fial-to-safety' designs ensure safety to men and machines in the event of over failure. With the advancement in electricl drives and electronics, the drives have pushed the mechanical systems to high level of operations and demanding safer and reliable braking loads moving at much higher speeds than earlier. Continuous developments in product improvisation and assured quality checks, the thrusters offer compact, reliable yet economical solutions to most of the industrial applications.

Assembly and Function

The two main sub-assemblies of the hydraulic thruster, the electric motor and the hydraulic unit are co-axially assembled form the working unit. In the switched off state (de-energised) the piston is at its lowest position due to external load (as brake spring of the drum brake), and the brake is applied. When energized, the electric motor drives the pump and delivers working fluid under the piston axially in the guided path, and delivers thrust or force required to operate the attached devise (like thruster brake) via the piston rod and the eye-lug attached to it. The working stroke can be steplessly controlled by external load. The thruster is designed for long trouble free service. The motor windings are designed to meet contingencies. The bearings are adequately sized.

• Gentle Application and release of brake without jerks and shocks
• Compact unit
• Constant magnitude
• Self aligned movement
• Low power consumption
• Minimum maintainance
• Easy mounting and dismounting

Introduction

Thruster brake is a device used to retard the speed of moving machinery and to stop it accurately to the desired position. The braking force is applied to the brake shoes by a pre-stressed comprising spring. The shoes press on the rotating brake drum retarding its speed and finally stop it. The releasing of the brake drum and compressing of the spring is done by thruster.

Assembly and Function

A thruster shoe brake has a pair of cast iron shoes which are lined up with friction pads. The shoes are hinged on main arm and side arm of the brake, each of them have a hinge pin fitted in the base. They are connected to each other on top by a tie rod, which is hinged in the main arm and locked to the swivel block in the side arm, by a lock nut. A crank lever is hinged on the main arm and the other end is fixed to the top clevis of the thruster by a hinge pin. A brake spring is fixed on the main arm and is pre-loaded by a locknut on the lever. The pre-tension in this spring decides the braking torque. The thruster is fitted on the base by a hinge pin. When the thruster is not energized, the brake shoes are pressed on the brake drum fitted on the drive motor shaft and hold it under the effect of braking force provided by the spring. In such condition, the brake is applied and the drum cannot rotate. As the piston travels upwards the angle lever turns, pushes the brake rod and compresses the brake spring. Simultaneously, the brake lever on the other side of the wheel (Brake Drum) is retracted. When the first lever reaches the stop on the brake base member the brake lever at the thruster begins to move, releasing the brake drum.

Introduction

For infallible operation of machinery, modern methods are necessary, any machine which requires its motion to be controlled, whether it is a lifting Crane, Hoist, Winch or Mining Haulage today employs an Electro Magnetic Brake, enabling the operator not only to control the motion but also to hold the load at any desired point without danger of falling, merely by release of the starting handle. Electro magnetic Brake is adequate equipment for safer operations of machinery. Electro magnetic Brakes are used when a load must be stopped rapidly to prevent it from rotating. Electro Magnetic Brakes find its use in Paper Mills, Drives of certain textile machines, Sugar Mill Machinery, Rubber Mixing Mills. .

Assembly and Function

The Shoes are of cast iron and other components are of fabricated steel. The lever is hinged on the main arm, which is connected to the side arm through a tie rod, and is stressed by a pre-loaded compression spring. The compression of the spring can be adjusted to set the braking torque to desired value. The brake liner of selected quality material is riveted to the shoes by aluminum rivets. A.C. solenoid with laminated magnetic sheet steel houses a copper magnetizing coil which is impregnated with Class F materials. The plunger which is connected to the lever, is drawn in to the coil, when it is energized with AC source. This loads the spring and releases the brake shoes from the brake drum. When the supply is cut off, the plunger is pulled out of the coil, and spring force clamps the brake shoes on the brake drum and the brake is applied.

Thruster brake is a device used to retard the speed of moving machinery and to stop it accurately to the desired position. The braking force is applied to the brake shoes by a pre-stressed comprising spring. The shoes press on the rotating brake drum retarding its speed and finally stop it. The releasing of the brake drum and compressing of the spring is done by thruster.