A system for controlling the extension and retraction of the school bus safety escape door pedal

Abstract

The invention relates to the field of school bus safety facilities, in particular to a system for controlling the extension and retraction of a school bus safety escape door pedal. It includes: air pump, two-position five-way manual air valve, two-position five-way solenoid valve, safety pedal, control circuit and cylinder, the P-position air source port of the two-position five-way manual air valve is connected to the air pump; The port is connected to the first interface of the cylinder, and the reversing port at B1 is connected to the second interface of the cylinder; a return spring is arranged in the cylinder, and when the cylinder is in zero position, the safety pedal is in an extended state. When the electronic control system of the safety escape door pedal fails, the two-position five-way manual air valve can continue to work independently, and the safety escape door pedal can be opened manually to achieve the rapid and safe evacuation of the vehicle in an emergency purpose.

Description

technical field [0001] The invention relates to the field of school bus safety facilities, in particular to a system for controlling the extension and retraction of a school bus safety escape door pedal. Background technique [0002] The existing school bus safety escape door pedal extension and retraction system does not have a manual air valve, and completely relies on electronic control to control the extension and retraction of the safety escape door pedal, such as image 3 As shown, it can be known that the current needs to pass through the first main power switch 2, the second main power switch 3, the first fuse 4, the ignition switch 5, the second fuse 6, the third fuse 7, the magnetic control switch 8, and the electromagnetic relay 9 Only then can the solenoid valve 12 be reached to make it work normally, so the battery 1, the first main power switch 2, the second main power switch 3, the first fuse 4, the ignition switch 5, the second fuse 6, the third fuse 7, the ma...

AI Technical Summary

Problems solved by technology

[0002] The existing school bus safety escape door pedal extension and retraction system does not have a manual air valve, and completely relies on electronic control to control the extension and retraction of the safety escape door pedal, such as image 3 As shown, it can be known that the current needs to pass through the first main power switch 2, the second main power switch 3, the first fuse 4, the ignition switch 5, the second fuse 6, the third fuse 7, the magnetic control switch 8, and the electromagnetic relay 9 Only then can the solenoid valve 12 be reached to make it work normally, so the battery 1, the first main power switch 2, the second main power switch 3, the first fuse 4, the ignition switch 5, the second fuse 6, the third fuse 7, the magnetic control Failure of any part of the switch 8 or the electromagnetic relay 9 or the connecting wires between them (such as short circuit of the wire, open circuit and damage to electrical components, etc.) will directly cause the solenoid valve 12 to not work normally, the solenoid valve does not work, and the SC double Action cylinder 17 just can't work normally, and safety escape pedal also just can't stretch out

[0003] Additionally, if image 3 As shown, it can be known that the compressed air generated by the air pump 13 needs to pass through the air filter 14, the air storage tank 15, and the solenoid valve 12 to enter the SC double-acting cylinder 17 to make it work after entering the air pipe. Therefore, the air pump 13, the air filter 14, and the air storage tank Failure of any part of 15 and solenoid valve 12 or the connecting air pipe between them (such as damaged air pump, damaged air storage tank, bursting of connected air pipe, etc.) will cause SC double-acting cylinder 17 to fail to work without a power source, and the safety escape door pedal Also just can't normally stretch out work, the vertical distance from the safe escape door of existing school bus to the ground is about 90 centimetres, height is relatively high for children, there will be very big potential safety hazard once danger occurs

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