First, the correct use of rotary cultivators 1, the correct choice of rotavator knife shaft speed and tractor speed. In order to ensure that the soil in the operation of the rotary cultivator meets the agronomic requirements, the advance speed of the dry tillage operation is 2-3 km/h, and for the hydroponic or sloping operations, 3-5 km/h can be selected. For the rotation speed of the rotary cutter shaft, the low speed gear is generally used for paddy farming or tilling with relatively large resistance, and the rotation speed is about 200 rpm. When the soil with relatively small specific resistance is used for hydroponic, alfalfa and tillage High-speed gears are used, and their speed is generally around 270 rpm. 2, rotary cultivator operations. 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 tiller is not affected 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. 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. When adjusting, pay attention to the force of the top tensioning slide rail should be within 5-10 kilograms, in order to be able to pressure the loose edge chain is appropriate, if the use of pressure does not move, then the chain is too tight. 2, the adjustment of the 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: 1 meter rotary cultivator first axis, 1.25-1.75 meter side rotation rotary cultivator on the first axis and the second axis of the cone bearing, intermediate transmission rotary cultivator cylindrical gear shaft and Knife shaft A tapered bearing at the 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. Matsushita should remove the gasket. 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: 1 meter of rotary cultivator middle gear box second shaft, 1.25-1.75 meter side drive rotary cultivator middle gear box on the third shaft cone bearing, middle gear transmission rotary cultivator gear box bevel gear Axle (first axis) bevel gear. The adjustment method is (take a 1 meter rotary cultivator as an 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 the inertia force. Then 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, the main working parts overhaul (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. (Heilongjiang Gaotie Feng Liu Xianfeng)
Venlo structure is a popular one at present. This architecture uses horizontal girder as main bearer, forming a stable structure with columns. There is consolidation between horizontal girder and column, and hinge is used to connect column and foundation.
In Venlo Greenhouse, foundation is made of reinforced concrete and the side wall is made of brick or reinforced concrete plate. The steel frame always use hot dip galvanized light steel. Roof beam adopts horizontal girder structure and using herringbone connection. The horizontal girder bears 2 or more roofs, which is made of aluminum alloy. This material is used as roof structure material and also glass inlay material. Other beams using gutter style to minimize the section. Delighting material of the roof and side wall using the hollow double-layer or multilayer PC board.
PC board is mainly made of PC/PET/PMMA/PP materials, it need sun screen coating to resist ultraviolet resist and ageing, and it is also required to be anti condensation and antidrug.
As a kind of light material, use PC board can greatly reduce the weight of greenhouse structure, and corresponding reduced the size of the steel frame, which saving the cost of steel.
PC Board Venlo Greenhouse
Pc Board Venlo Greenhouse,Venlo Greenhouse,Venlo Type Pc Sheet Greenhouse
JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , http://www.spgreenhouse.com
