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Protection Switch Product Introduction
To ensure the utmost safety of trains, certain station sections require the strategic installation of protection switches. These switches collaborate seamlessly with specific conditions to guarantee impeccable safety standards. Unlike other arrangements, the protection switch is not integrated with the usual setups but demands belt manipulation or manual handling, ensuring it is securely locked. The circuit meticulously verifies the turnout position (ensuring correctness) and locks it in the designated protective position, enabling complete locking and signal activation. Depending on its usage and varied protection needs, protection turnouts can be classified into several scenarios:
For sections with a 6 ‰ downhill gradient (or slightly less but with challenging train braking conditions at the entrance), the initial group of turnouts is ingeniously designed for protection. These turnouts can be adjusted to position the train safely on the designated safety line, special line, or refuge line.
In cases where a 6 ‰ down ramp continues along the approach terminal, protective turnouts safeguard against train overrun beyond the outbound signal machine. These protective turnouts can guide the train onto a safety line, dedicated line, refuge line, or back to an appropriate exit, fortifying the approach. This particular fork is adeptly circuit-driven.
Another scenario involves a 6 ‰ down ramp continuing at the approach terminal, which can feature a leveling protection fork. This fork is maneuvered manually, not circuit-driven, yet its position is diligently checked when a train travels along the 6 ‰ path. This fork generally displays its position externally, coordinating seamlessly with the continuation road's display – where the road's continuation is visible through light bands and signals, ideal for car pick-ups.
In areas with dedicated lines or frequent shunting operations, such as shunting lines, pull-out lines, and station line interfaces, protection turnouts are crucial. They ensure shunting trains are securely positioned on the dedicated safety line or pull-out line, preventing inadvertent transitions onto station lines during operations.
Through cross-ferry lines, two groups of double-acting turnouts provide robust mutual inspection protection. When one group is in reverse, the other must be protected in position. This tactical positioning avoids potential collisions at the cross-ferry line. During sidestroke maneuvers, the system buffers the sidestroke strength, effectively minimizing wear and tear.
| Number | Model | Gauge(mm) | Frog No. | Curve | Radius(m) | Total Weight(kg) |
| 1 | DK612-2-3 | 600 |
No.2 | 3 | 400 | 311 |
| 2 | DK612-3-6 | No.3 | 6 | 6100 | 515 | |
| 3 | DK612-4-12 | No.3 | 12 | 6800 | 573 | |
| 4 | DK612-5-15 | No.5 | 15 | 7400 | ||
| 5 | DK615B-2-3 | No.2 | 3 | 4000 | ||
| 6 | DK615B-3-6 | No.3 | 6 | 6100 | ||
| 7 | DK615B-4-12 | No.4 | 12 | 6800 | ||
| 8 | DK615B-5-15 | No.5 | 15 | 7400 |
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