1. Correctly choose rotary shaft speed and tractor speed. In order to ensure that the soil of the rotary cultivator is in accordance with agronomic requirements during the operation, the forward speed of the dry tillage operation is selected from 2 to 3 km/h, and that from the ploughing or ploughing operation is 3 to 5 km/h. For the rotation speed of the rotavator knife shaft, the low speed gear is generally used when the soil with relatively large resistance is used for the tillage or tillage, and the rotation speed is about 200r/min, which is used when the soil with smaller specific resistance is used for hydroponic, hoe and tillage. High-speed gear, its speed is generally about 270r/min.
2. Rotary tillage operation. Because there are two forms of the hydraulic suspension device and the structure of the power output shaft of the tractor, the rotary cultivator is different in the lifting operation. One is that the tractor hydraulic suspension mechanism and the power output shaft are respectively driven (such as Taishan-50, Dongfeng-50, Shanghai-50 and other tractors). Regardless of whether the power output shaft rotates, the rotation of the rotary cultivator may not be influenced by the power output shaft. Another type of tractor's hydraulic suspension mechanism and power output shaft are linked (such as the Harvest-27 tractor). With this model, the rotary cultivator can only be lifted when the power output shaft is rotated. When this kind of tractor is working in the field, if the cutter blade is stuck in the mud, the cutter shaft will not move, the tractor will be extinguished due to the heavy load, and the rotary tiller will not rise. At this moment, the power output shaft should be Remove the joints and allow the power output shaft to idle and lift the rotary tiller.
When using a tractor with a separate hydraulic suspension mechanism (such as Dongfanghong-75/802 tractor), the tractor's hydraulic suspension joystick should be placed in the floating position. After each descent or lifting of the rotavator, the handle should be quickly placed in a floating or elevated position, not in the pressure drop and neutral position. When lowering the rotary tiller, do not use the pressure drop position to avoid damage to the implement. When the tillage depth is adjusted, the crop should also be cultivated first. After the soil has reached the working requirement, the rotary cultivator stops and the fixed cylinder locates the position of the clamp stopper as the maximum tillage depth limit position. After that, the lift handle is operated again. Damage to the rotavator.
The suspension mechanism is a semi-detached tractor with a position adjustment device, and no depth limit device can be provided. The stable tillage depth is controlled by the position adjustment handle, which is compared with a tractor with a separate suspension mechanism only having a force adjustment device. When working in the floating position, under the action of self-weight, the tillage machine will change with the depth of the soil is solid or loose, so when working, it is best to install a depth limit device to stabilize the depth of cultivation. In dryland operations, depth-limited wheels or skid-type depth-restricting devices may be used. Paddy-slide deep-receiving devices may be used in paddy fields. At present, due to the fact that domestic tractors are mostly semi-split type, there is a force and position adjustment joystick suspension mechanism, and no depth limit device is set on the rotary tiller.
Second, the rotavator adjustment and maintenance
1. The adjustment of the chain. Chain adjustment should pay attention to the looseness of the chain and the phenomenon of chain climbing, too tight will increase the wear and tear. In the adjustment, pay attention to the force of the top tensioning slide rail should be within 5 ~ 10kg, it is appropriate to press the loose edge chain, if you do not use dynamic pressure, it means the chain is too tight.
2. Adjustment of bearing clearance. There are two ways to adjust: First, increase or decrease the shims. For bearings with fixed inner ring and adjustable outer ring, the axial clearance can be adjusted by increasing or decreasing the gasket at the bearing cover. Using this method to adjust the bearing clearance mainly include: 1m rotary cultivator first axis, 1.25 to 1.75m side-drive rotary cultivator on the first axis and the second axis of the tapered bearing, intermediate transmission rotary cultivator cylinder gear shaft and knife Conical bearing at the shaft spline shaft. After checking the adjusted bearing clearance, if there is no measuring instrument and special tool, the shaft can be turned by hand according to experience, there should be no obvious axial turbulence and rotation is flexible, if it is too tight and the rotation is difficult, the spacer should be added. Shim should be removed. The second is the adjustment nut. All bearings that are fixed in the outer ring and adjustable in the inner ring can be used to adjust the axial clearance. Adopt this method to adjust mainly include: 1m rotary cultivator middle gear box second shaft, 1.25~1.75m side drive rotary cultivator middle gear box on the third shaft cone bearing, middle gear transmission rotary cultivator gear box bevel gear shaft (first axis) bevel gear. The adjustment method is (take a 1m rotary cultivator for example): first tighten the round nut of the big bevel gear end, lock the thrust washer, then tighten the other end of the round nut, and turn the bearing by hand until it cannot rely on inertial force again Turn, and then hit the shaft with a wooden hammer head, so that the bearing inside and outside the ring close, and then review the bearing preload situation, adjusted and locked with a locking nut.
3. Overhaul of main work components: (1) Machete. The blunt machete should be re-sharpened, the deformed machete must be cushioned, and then quenched (the handle part is not hardened). The hardened machete hardness should be HRC50-55. If it is damaged, it should be replaced with a new one. (2) Tool holder. The damage of the tool seat is mostly de-welding, cracking or hexagonal hole deformation. The partially damaged tool holder can be repaired by the welding rod, and the damaged one should be replaced. But when welding the tool holder, pay attention to the deformation of the tool shaft. (3) Axle shaft tube. Broken knife shaft tube can put a piece of round steel with good weldability in the tube at the fracture. After welding, artificial aging and straightening should be performed. Then check the bearing shields at both ends. If the overshoot is too large, replace the end with no spline. The shaft head should be based on the original spline end diameter as the basis for processing the new shaft head to ensure that the knife shaft rotation and balance.
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