The working principle and troubleshooting method of the braking system of mine underground loader

The braking work of underground mine loaders is mainly determined by the energy storage spring air chamber. The energy storage spring air chamber of the mining underground loader is a combination of the service brake air chamber and the parking brake air chamber. The service brake air chamber is at the bottom, the parking brake air chamber of the mining underground loader is at the top, and the service brake air chamber is at the top. The vent of the dynamic air chamber is welded to the housing of the parking brake air chamber, and its hole is parallel to the hole of the breather joint of the parking brake air chamber, and the hole parallel to the axis of the air chamber is connected to the service brake air chamber. Connected. The piston assembly of the service brake air chamber includes a piston body, a sealing ring, and a guide sleeve. When the parking brake is applied, the push rod only pushes the piston and when the service brake is applied, the piston does not move.

Before starting the mining underground loader, the joystick of the hand control valve should be pulled back to the position of releasing the parking brake, so that the compressed air from the parking brake air reservoir can be filled into the parking brake air chamber, and the energy storage spring can be compressed to release the parking brake. The parking brake piston returns to the non-braking position, and the service brake piston also returns under the action of the return spring. At this time, the parking brake is released and the mining underground loader can start. However, if the air pressure in the air reservoir does not reach the minimum safe value, it is impossible to compress the spring, so the loader cannot start. This is done by using the energy storage spring. Main advantages of parking brake.

When the driver of the mine underground loader operates the manual brake valve, the core tube is close to the control cam under the action of the spring. At this time, the air inlet valve is closed, the exhaust valve is opened, and the air outlet is vented to the atmosphere through the core tube and the exhaust port. At the same time, the energy storage brake air chamber in the composite brake air chamber is also vented to the atmosphere through the quick release valve. The loader is then in parking brake mode. The maximum stroke of the parking brake chamber push rod is generally 10% greater than the maximum stroke of the service brake push rod. Therefore, when the service brake push rod has moved to the maximum stroke, full braking cannot be achieved due to excessive brake clearance. When moving, the parking brake air chamber can be deflated, and the energy storage spring is used to assist, and the service brake push rod is further pushed out to achieve complete braking.

Common faults and troubleshooting methods of the air brake system of mine underground loaders:

1. Common causes of insufficient foot braking force: ① The brake cylinder leaks oil; ② There is air in the brake hydraulic pipeline; ③ The cup of the brake master cylinder is worn; ④ The wheel hub leaks oil onto the brake pad; ⑤ The brake pad is worn to the limit.
The troubleshooting methods are as follows: ① Check or replace the oil seal; ② Remove the air in the pipeline; ③ Clean or replace the leather cup; ④ Check or replace the wheel hub oil seal; ⑤ Replace the brake pads.

2. Causes of deviation during braking: ① The left and right braking torques are not the same; ② The left and right tire pressures are different.
The troubleshooting methods are as follows: ①Inspect the wheel cylinder and pipeline; ②Make the tire pressure consistent.

3. Reasons for insufficient hand braking power: The gap between the brake drum and brake pads is too large. Troubleshooting method: Readjust as required.

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