1. Model Interpretation & Core Function
The TYW-200-CL.CP's model code directly reflects its operation mode, structural features, and environmental adaptability:
| Model Segment | Meaning |
|---|---|
| TYW | Foot-Operated Hydraulic Drum Brake Series (foot-driven hydraulic transmission, spring reset) |
| 200 | Brake drum diameter: 200 mm (optimized for low-speed heavy-load torque transmission) |
| CL | Corrosion-resistant configuration: Epoxy coating on metal components to resist humidity/corrosion |
| CP | Enhanced protection configuration: Dustproof cover + sealed hydraulic system for harsh dusty environments |
Its core functions target manual, safe braking for low-speed industrial machinery:
Foot-Controlled Hydraulic Braking: Adjusts braking force via foot pedal stroke, enabling stepless control for precise deceleration or stopping.
Spring-Assisted Reset: Automatically releases the brake when the pedal is released, ensuring quick return to the ready state.
Dual Protection (CL+CP): Resists corrosion, dust, and moisture, adapting to outdoor or harsh industrial environments.
Mechanical Safety Backup: Equipped with a manual emergency brake lever for fail-safe protection if the hydraulic system malfunctions.
2. Working Principle
The TYW-200-CL.CP operates through foot-driven hydraulic pressure transmission + spring reset, with mechanical emergency backup. Its working cycle includes three key states:
2.1 Braking Execution (Foot-Operated State)
When the operator depresses the foot pedal, the integrated hydraulic pump compresses hydraulic oil (ISO VG46 anti-wear hydraulic oil), generating 8–15 MPa hydraulic pressure.
Hydraulic pressure is transmitted to the dual brake cylinders via high-pressure hoses, pushing the pistons to drive the arc-shaped brake shoes outward.
The friction linings on the shoes clamp tightly against the inner wall of the 200 mm diameter brake drum, generating 300–500 N·m braking torque. Friction between the linings and drum decelerates or stops the rotating mechanism.
2.2 Brake Release (Reset State)
When the operator releases the foot pedal, the hydraulic pump's pressure relief valve opens, and the hydraulic oil flows back to the reservoir.
Internal return springs (65Mn steel) rebound, pulling the brake shoes inward to disengage from the drum. A 0.4–0.6 mm clearance is maintained to avoid drag friction during equipment operation.
2.3 Emergency Braking (Mechanical Backup)
If the hydraulic system fails (e.g., oil leakage, pump malfunction), the operator can pull the manual emergency lever.
The lever drives a mechanical linkage to directly push the brake shoes outward, clamping the drum to achieve emergency braking, preventing equipment runaway.
Key Design Support
Pressure-Regulating Valve: Limits maximum hydraulic pressure to 15 MPa, protecting the hydraulic system from overpressure damage.
Automatic Clearance Adjuster: Compensates for friction lining wear (up to 10 mm) to maintain stable braking performance without manual calibration.
