How to Choose the Tractor Suspension System?

Strong pressure is now commonly used on domestic large and medium horsepower tractor engines in order to adapt to national conditions. The large-scale use of forced pressure systems began approximately in 2002, and it emerged on tractors. In the summer of 2001, when the wheat was harvested, there was a lot of rain, and the soil was wet. In the autumn, the weather was dry and the soil was compacted. The rotary tiller has difficulty in entering the soil during operation, and the tillage depth is shallow, which cannot meet the tilling requirements. At that time, most of the tractors were non-strong pressure hydraulic systems. To solve this problem, the following methods were adopted: one is to shorten the upper rod to increase the angle of soil entry, the other is to increase the weight on the rotary tiller, the third is to reduce the vehicle speed and downshift. , If the effect of entering the soil is still not good, you need to increase the rotation speed of the rotary tiller.

 

Increasing the rotation speed of the rotary tiller blade shaft is an effective method to improve the soil penetration performance of the rotary tiller. After the rotary tiller blade shaft speed is increased, the soil penetration performance is significantly improved, and the operation effect is good, which can meet the farming requirements without reducing the operation efficiency. Rotary tiller blade shaft speed = tractor power output shaft speed × rotary tiller primary bevel gear transmission ratio × rotary tiller secondary gear transmission ratio. Different rotary tillers have different first-stage bevel gear transmission ratios, but the second-stage gear transmission ratios of various rotary tillers are the same (that is, 13 to 19, 13÷19=0.68).

 

It can be seen from the formula of rotary tiller blade shaft speed that there are ways to increase the rotary tiller blade shaft speed. If the tractor with jet engine has a two-speed power output (540/760, 720/850, 540/1000, 760/1000), select high-end power output. If the tractor engine horsepower has a single-speed power output, the first-stage bevel gear transmission ratio of the rotary tiller gearbox needs to be replaced. The most replaced gear that year was to replace the first-stage bevel gear of 17 to 37 on the original rotary tiller with a 19-ratio 35 gears. If the tractor's power output shaft speed is 760 rpm, and the rotary tiller gearbox uses a 17 to 37 first-stage bevel gear, the rotary tiller blade shaft speed = 760*17/37*0.68=237 rpm. When the tiller gearbox uses a 19:35 first-stage bevel gear, the rotary tiller blade shaft rotation = 760*19/35*0.68=280 rpm, and the speed is increased by nearly 20%.

 

When rotary tilling, if the soil is hard, the rotary tiller has poor performance in entering the soil, the solution is to use a strong pressure tractor engine assembly and use the tractor's strong pressure function to force the soil. The second is for non-strong pressure tractor jet engines. The following methods can be used to adjust: one is to shorten the upper rod to increase the angle of the rotary tiller into the soil to improve the performance of entering the soil, the second is to increase the rotary after the rotation speed is increased, the cutting ability of the rotary tiller on the soil is obviously improved, and the effect of soil entry and tillage is obviously improved, the third is to increase the weight on the rotary tiller, and the weight of the rotary tiller increases, the effect of entering the soil is obviously improved, the fourth is to reduce the tractor speed, after the tractor slows down, the working effect will be significantly better.

 

 

At present, the strong pressure system is commonly used on domestic large and medium horsepower tractors, but the non-strong pressure system with force and position control is more sensitive, more accurate, simpler to operate, and has better operating effects, which is more conducive to the operation of the engine and the tractor and engine spares and the driver. Now some domestic high-horsepower tractors have adopted electro-hydraulic integrated lifting control systems, which are all non-forced, with force feedback sensors and position feedback sensors, and most of them realize one-button control. Imported high-horsepower tractors hydraulic lifting systems are also mostly non-pressurized. The strong pressure electro-hydraulic integrated lifting control system has good use effect and precise control.

 

Judging from the development experience of tractors in developed countries, the hydraulic suspension system of domestic high-horsepower tractors will definitely be developed to a non-strong pressure system controlled by an integrated electro-hydraulic system in the future.

 

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