Power takeoff combination system as well as control method and track firefighting truck thereof

Abstract

The invention provides a power takeoff combination system as well as a control method and a track firefighting truck thereof. The power takeoff combination system comprises an engine, a power takeoffand a control device, wherein the engine is used for providing power; the power takeoff is used for conducting the power provided by the engine to a hydraulic oil pump and a water pump; a hydraulic motor is driven to operate by the hydraulic oil pump to drive a walking system of the track firefighting truck; the control device is in signal connection with the power takeoff, the hydraulic oil pumpand the hydraulic motor respectively and is used for acquiring power takeoff instructions of the water pump and used for adjusting the displacement of the hydraulic motor into zero. By adopting the technical scheme, after the firefighting truck acquires the power takeoff instructions of the water pump, the displacement of the hydraulic motor is adjusted into zero firstly, secondly, a vehicle speedis reduced, then when the water pump is combined with the power takeoff in the walking process of the firefighting truck, the hydraulic motor is prevented from unlubricated friction as water is completely sucked off after the flow is reduced, the risk that the hydraulic motor is burnt is reduced, and the stability of a vehicle walking power source can be ensured.

Description

technical field [0001] The invention relates to the field of fire trucks, in particular to a power take-off combination system, a control method thereof, and a rail fire truck. Background technique [0002] Fire trucks, also known as fire trucks, refer to special vehicles that are mainly used to perform fire response tasks. Fire departments in most countries, including China, also use them for other emergency rescue purposes, so fire trucks can reach the rescue scene in time and It is very important to carry out rescue operations. [0003] At present, the driving force of the water pump in the common water pump fire truck comes from the power take-off of the fire truck chassis. When approaching the rescue scene or when the fire truck itself has a safety crisis, it needs to be combined with the water pump, and the power source of the hydraulically driven running system also comes from the chassis. force device. If the power is directly combined with the water pump during th...

AI Technical Summary

Problems solved by technology

If the power is directly combined with the water pump during the walking process, the lowering of the chassis engine speed or disengagement of the power take-off will cause the input power of the hydraulic oil pump to decrease or disappear, and the speed of the vehicle does not change at this time, so the hydraulic motor driven by the hydraulic oil pump The speed has not changed, and the flow required to drive the hydraulic motor has not changed, but the output flow of the hydraulic oil pump has decreased due to the deceleration of the engine speed of the chassis, which will cause the hydraulic motor to absorb air, dry friction inside the motor, and burn out the hydraulic motor. The vehicle loses its walking power source and cannot perform rescue functions, especially when the rail fire truck performs rescue tasks in the tunnel, the smoke in the tunnel may even bring life-threatening danger to the rescuers on the vehicle

[0004] In view of the above-mentioned problem that the motor may be burned out during the walking process of the fire truck, causing the vehicle to lose its driving power source, the current common practice is to stop the vehicle before the fire truck enters the tunnel and combine the power of the oil pump with the power of the water pump to avoid Combining water pump and power take-off while driving

[0005] However, the distance from the vehicle contacting the track to the fire scene is usually 20-30Km, and the speed of the track fire truck on the track is generally within 40Km / h. After the water pump is combined, the water pump will consume the power of the chassis engine and cannot be used. The power of the chassis engine is all used for the running system, which will prolong the time for the fire truck to reach the rescue scene, delay the rescue opportunity, and reduce the rescue efficiency

[0006] Therefore, the technical problem that needs to be solved urgently is how to combine the power of the water pump and the power of the oil pump during the walking process, and avoid the situation that the hydraulic motor is sucked and dry friction causes the hydraulic motor to be burned out.

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