TWZB Foot-Operated Hydraulic Drum Brake TWZB-200

 

 

 

 

 

 

 

The TWZB-200 is a high-reliability normally open brake from the TWZB series of foot-operated hydraulic drum brakes. It is designed for small-to-medium duty industrial equipment, with a rated braking torque of 150–200 N·m and compatibility with 200 mm diameter brake drums. Characterized by hydraulic transmission, mechanical reset, stable braking performance, and no power dependency, it is widely used in scenarios requiring manual-controlled deceleration and stopping. Details of its working principle and applications are as follows:

1. Working Principle

The brake operates based on the combination of foot-driven hydraulic pressure and spring reset, supplemented by wear-compensating and maintenance-friendly structural designs. The core working process includes three stages:

1.1 Braking Execution

When braking is required, the operator depresses the matching foot hydraulic pump. The hydraulic oil in the system is pressurized (working pressure: 6–12 MPa) and transmitted to the brake wheel cylinder via high-pressure hoses.

The piston in the wheel cylinder pushes outward under hydraulic force, driving the two arc-shaped brake shoes to swing outward around fixed fulcrums.

The asbestos-free friction linings on the brake shoes tightly fit the inner wall of the 200 mm brake drum (rotating synchronously with the equipment shaft). The generated friction torque resists the drum's rotation, rapidly decelerating the equipment shaft until it stops, achieving stable braking.

An integrated interlocking equal-clearance device ensures uniform gaps between both brake shoes and the drum, avoiding uneven wear or reduced braking efficiency caused by one-sided lining adhesion.

1.2 Brake Release

When the operator releases the foot pump, the hydraulic system pressure drops sharply and is relieved through the pressure relief valve.

The return springs (65Mn steel) inside the wheel cylinder rebound, pulling the piston and brake shoes inward to reset. The friction linings completely disengage from the brake drum, leaving a 0.4–0.6 mm clearance to eliminate drag friction.

The brake drum is no longer constrained and rotates freely with the equipment shaft, allowing the equipment to operate normally.

1.3 Structural Advantages for Stable Operation

Self-lubricating Hinges: All main hinge points are equipped with self-lubricating copper bushings, eliminating the need for frequent manual lubrication, reducing component wear, and ensuring smooth braking actions.

Quick-Replace Linings: Friction linings adopt a clip-on design, enabling fast disassembly and replacement without disassembling the entire brake, minimizing maintenance downtime.

Pressure Protection: A built-in pressure-limiting valve prevents overpressure in the hydraulic system (max pressure ≤15 MPa), protecting hoses and cylinders from damage.

2. Key Features

Power-Independent: Pure mechanical-hydraulic design, no reliance on electricity, suitable for outdoor, remote, or power-free workplaces.

Stable & Adjustable Braking: Stepless adjustment of braking force via foot pedal stroke, avoiding inertial shock to equipment or loads.

Durable Structure: Brake drum made of HT300 gray cast iron (wear-resistant and heat-dissipating); friction linings with heat resistance up to 380°C and long service life.

Easy Maintenance: Modular hydraulic components and clip-on linings simplify daily inspection and replacement, lowering maintenance costs.

3. Application Scenarios

The TWZB-200 is ideal for small-to-medium industrial equipment requiring manual braking control, with core applications in:

3.1 Small-to-Medium Hoisting Machinery

Compatible with the traveling mechanisms of overhead cranes, gantry cranes (5–10 ton load capacity), and small jib cranes in workshops, warehouses, and small ports.

Provides smooth deceleration during material hoisting, preventing load shaking or displacement caused by abrupt braking, ensuring operational safety.

3.2 Non-Lifting Winches & Traction Equipment

Matches non-lifting winches such as workshop material traction winches, small mine auxiliary transport winches, and construction site cable pullers.

Enables on-demand deceleration or emergency braking during traction, avoiding excessive sliding of materials due to inertia and ensuring precise positioning.

3.3 Light Conveying & Handling Equipment

Installed on the transmission mechanisms of light belt conveyors, roller conveyors, and manual forklifts.

For conveyors: Prevents material accumulation or scattering via quick emergency braking; for forklifts: Enhances parking accuracy and avoids collisions with goods or equipment.

3.4 Outdoor & Special Working Conditions

Suitable for small construction hoists, agricultural machinery (e.g., tractor trailers), and outdoor auxiliary equipment.

Optional anti-corrosion coating (epoxy resin) adapts to humid, dusty, or mildly corrosive environments (e.g., coastal workshops, chemical plant peripherals), maintaining stable performance.

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