Parker Hannifin Symposium on Parker loader solutions       

In November 27, 2014, Shanghai BMW exhibition, at the Shanghai New International Exhibition Center held a conference room of Parker Hannifin Solutions Seminar loader, given by Wang Qiang, Dr. Zhang Hao. The following is the specific content.

First, the agenda:

1. The technical route of Parker loader: from traditional hydraulic system to intelligent hydraulic system

2, Parker quantitative confluence system solutions

3, Parker total variable confluence system solutions

4, Parker semi variable confluence system solution

5 、 Parker IFC intelligent flow control solutions

Comparison of two variable system and quantitative system: energy saving: variables provide the required system flow, no excess waste flow; variable system in rising condition (high pressure and small flow), from there is no overflow loss, the transmission system can get more power, the traction force becomes larger; variable system in transportation condition no, the pump output flow.

Maneuverability: closed middle position valve has better maneuverability than open middle position valve.

Three. Comparison of LS and LSPC in variable system

LS advantages and disadvantages: without the compensator, the pressure loss is small, the oil capacity is strong; in the system under flow state, there is no flow sharing function, low pressure load priority to obtain traffic.

LSPC advantages and disadvantages: with a back compensator, pressure loss; in the system under the state of flow, with flow sharing function, can do compound action, low pressure load pressure loss is larger.

Four. Comparison between steering confluence system and steering independent system

Steering confluence system: cost advantage; side to side lifting, priority to meet the steering, affect the lifting speed; full flow through the priority valve of the pressure loss.

Steering independent system: higher cost; side to side work, does not affect the lifting speed; compared to the steering confluence system, no total flow through the priority valve pressure loss.

Five, loader pilot hydraulic control system characteristics: 1, high accuracy, 2, output pressure can be adjusted, 3, low hydraulic hysteresis, 4, better control performance, 5, higher oil capacity.

Six 、 KM 300 loader valve

1, the overall opening of the middle 3 spool and 2 spool structure.

2, there are parallel, series and parallel loop, the last stage spool (boom control) with four bit floating function.

3, the bucket and boom control integrated low flow special regeneration device, the A port to B port oil, to meet the high performance requirements of anti cavitation loading.

4, KM300 bucket and boom oil port using double oil port, in order to optimize the hydraulic pipeline, reduce costs. The balance valve core and the fit clearance are small, which is very suitable for occasions with high leakage requirements.

5, additional overload valve and oil supply valve can effectively protect the system.

Seven, the characteristics of VP400

1, the valve uses valve compensation, load sensing and flow sharing function;

2, the spool diameter: 31.75mm, spool stroke: 12.7mm, in P=20bar through the main valve flow 430L/min;

3. Rated pressure 280bar;

4, using double working oil port.

Eight. Characteristics of M series valves for loaders

1. Select different valve cores according to the application;

2, without the compensator, the oil capacity is strong, the loss of the main valve is small;

3, easy maintenance, the leakage of oil to T is small;

4, not sensitive to temperature;

5, double working oil port, easy piping layout.

Nine, the problem of fixed variable confluence system to be solved

Fixed variable confluence system: variable hydraulic pump is used in steering hydraulic system, quantitative pump is adopted in working hydraulic system, and the following problems should be solved;

1, when the loader is in the transportation state, because the use of the opening and closing valve, to solve the variable displacement pump full displacement fuel supply problem;

2, when the floating down, because the working hydraulic system does not need oil supply, to solve the variable displacement pump full displacement fuel supply problem;

In 3, when the rising condition of loader, the system in a state of high pressure and small flow, the quantitative pump pressure to remove them, to save energy;

4, when only a turn (working device does not move), when the engine throttle, a turn, cannot have the steering pump flow through the valve opening in a flow into the tank.

Comparison of ten and three systems

1) LS systems used for comparison

Two load sensitive pumps

Steering priority valve

M402 load sensing valve

2) steering independent LS systems

Larger work pumps

The steering pump is supplied separately to the steering

M402 load sensing valve

3) IFC system steering and work independence

3 pumps, a load sensitive pump supply to the steering system + two electronic control pump supply work

Open middle position valve

Summary:

IFC uses electro proportional displacement control pumps and electronically controlled hydraulic valves;

IFC provides the optimal speed control of the actuator and the load control of the engine;

IFC technology improves system performance, reduces fuel consumption, and brings cost savings.