Causes and Prevention of Front Beam Breakage of Dongfanghong-75 Tractor

In recent years, Dongfanghong-75 tractor has been widely used in farmland infrastructure construction and engineering earthwork construction. In the operation process, the phenomenon of tractor front beam fracture occurs from time to time, usually manifested as: from the left guide wheel crankshaft shaft hole The weakest part of the lower part of the crack, first from the outside of the large shaft sleeve hole split to the other end of the small shaft sleeve hole, and some from the large shaft bushing fracture, the load continues to increase, the upper beam crankshaft shaft hole also produces fracture. Why is the front beam of a tractor frequently broken and how can it be effectively prevented? The author conducted a cursory discussion on this issue. I. Causes of the breakage of the front beam of the tractor There are many factors in the breakage of the front beam of the tractor. Improper operation is the key. When the tractor is carrying out high-strength operations such as deep ploughing and bulldozing, it will be under full load or even overloaded for a long time. The stress on the front girder will be greatly increased compared with the rated operating conditions. If there is any improper use, maintenance or assembly, the tractor , it is easy to cause damage to the front beam. 1. The use of improper operation. Ramp up and brake suddenly to make a sudden change in the speed of the tractor; to drive at a high speed on bumpy roads; not to slow down when crossing ridges, ditches, fields or other obstacles, so that the front beam is subjected to strong impact and vibration. Can easily cause the front beam to break. In the operation, high-speed turning, turning with load or turning in place, or even using the high-speed in-situ turning error method to check the power condition of the tractor greatly increases the load on one side of the track and causes the guide wheel to receive a very severe impact load. So that the front beam breaks. In addition, some of the pilots did not master the essentials of earth-moving operations and shoved and hard-drilled during the earth-moving operation, which caused a great impact and caused the front beam to be damaged. 2. Poor maintenance. Due to poor maintenance and lack of regular inspections and adjustments, it is not possible to guarantee the normal technical state of the part associated with the front beam, so that the front beam is easily damaged by the impact force during the operation. (1) The track length is not suitable. Sometimes the track is too short, so that the buffer spring is compressed to 250mm or less; sometimes because the track is too long, the guide wheel turning axis is adjusted to the front dead point position, so that the role of the buffer spring weakens or loses its function, and it encounters obstacles during walking. The front axle break shaft hole is easily damaged due to impact. (2) The shaft was stuck. Due to the failure of timely lubrication or poor lubrication of the bushing, the turning shaft of the steering wheel is jammed in the bushing. When the tractor encounters an obstacle while driving, the turning shaft cannot swing back and forth flexibly, and the impact force acts on the front beam directly. The hole in the turning shaft causes the front beam to crack. (3) The bolts fastening the front beam are loosened. Due to the lack of regular inspection of the fastening of the front beam, the front beam was not tightened in time after loosening of the fastening bolts, causing the front beam to sway in the frame girder. When the tractor encountered obstacles, the front beam was Great impact, easy to break in the shaft hole or screw hole. (4) The turning shaft moves in the sleeve. Due to lack of timely maintenance and lack of regular inspections, the turning shaft and bushings are seriously worn, which causes the turning shaft to sway in the shaft sleeve. When the tractor encounters an obstacle during driving, the front beam turning shaft hole is severely affected. Impact, and therefore fracture. 3. Unreasonable installation. Unreasonable installation will also increase the load on the front beam and cause it to break. (1) deformation of the beam. The deformation part of the girder is mainly in the front end section of the girder, and it is outwardly bent or twisted. Therefore, when installing the front girder, it has to be installed tightly with the bolt, so that the front girder produces a prestress and the tractor guide wheel is impacted. When force, it is easy to cause damage to the front beam. (2) After the derailment, the hard-rebuilding track is the main factor causing the fracture of the front beam. Because it is difficult to re-install the track at the work site, most drivers use the method of squeezing the pad, rigidly tighten the chain track, and start the tractor to push the guide wheel and the roller to the walking track of the track. The impact force of the guide wheel turning shaft is large, which will cause the turning shaft, the guide wheel, the adjusting screw, and the rear shaft to be deformed, thereby breaking the front beam. In short, the breakage of the front beam is often not caused by the above-mentioned individual factors, but it is gradually formed under the repeated action of various factors. What needs attention is that the front beam fracture affects all the components that are related to it. After the front beam breaks, the front end of the frame loses its rigidity, weakening the rigidity of the frame, and gradually deforming the frame under the action of load force. And further deform the crankshaft and guide wheel to adjust the screw. In addition, the front beam breakage also has an adverse effect on the leading wheel, drive wheel, rear axle, and large and small reduction gears. Second, the prevention of the front beam break some abnormal measures of the tractor front beam abnormal fracture, not only affect the progress of the work, but also cause some economic losses, to avoid early damage to the front beam, improve the driver's technical level, standard operation is the key. 1. The tractor should start and brake smoothly to avoid sudden changes in speed. Travel on low speeds on bumpy roads or across ridges, ditches, fields or other obstacles. 2. The length of the site should not be too short. It should be determined according to the turning radius of the unit. The unit should be allowed to move slowly during the turn of the ground, and the farm implement should be lifted and landed in a timely manner. The sharp turning of the agricultural implement in front of the plow should not be allowed. 3. Do not rush or hard-drill when doing earthmoving. 4. Always check the use of the various parts of the walking part and the degree of wear. The tightness of the track and the compression length of the buffer spring are timely adjusted so that the caterpillar sagging amount is maintained at 30 to 50 mm, and the compression spring has a compression length in the range of 260 to 265 mm. To regularly check the clearance between the guide wheel turning shaft and the large-sized shaft sleeve, when the clearance between the turning shaft and the large shaft sleeve reaches 1.2mm and the clearance with the small shaft sleeve reaches 1mm, repair is required. In addition, the front beam fixing bolts should also be checked and fastened regularly. Attention should be paid to the adjustment of the guiding wheel to adjust the bending and deformation of the screw, crank shaft, and frame, and the deformation must be straightened. When installing the new front beam, the frame, guide wheel, crankshaft, and adjustment screw must be restored to their normal fit. 5. After 20-25 hours of work, the tractor should lubricate the guide bush of the steering wheel. When the crankshaft is stuck in the sleeve, it should be promptly dismantled to find out the reason for elimination. 6. When the tractor is derailed at the work site, it is necessary to overcome the difficulties and try to open the track shoe, reinstall it after being laid, and strictly forbidden to put on.

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