The transfer case and transmission of the 408 type bulldozer with a point-supported non-buffer mechanism in the engine and the frame adopt helical gears, which have stable transmission, low impact and noise, large overlap coefficient, and forced gear shifting of dual-rod mechanical manipulators. Lubricating the gearbox body has a combination sleeve for the constant meshing bevel gear and the combination wheel, and the power transmission path is changed by changing the coupling relationship between the coupling sleeve and each gear, so that the forward 5th gear and the backward 4th gear travel speed are obtained. There is an interlocking device between the transmission and the main clutch to ensure that the shift lever or the advancing and retracting lever can only be operated when the main clutch lever is in the disengaged position. Otherwise, the shift lever and the advancing and retracting lever cannot be pulled. Movement, so as to avoid the driver's misuse caused by the gear teeth off and block the phenomenon.
The main clutch is a normally open wet structure, using multiple pieces of powder metallurgy friction plates, and forced lubrication, reducing friction plate wear and heat and slip phenomenon, improve the transmission efficiency of the main clutch and use life 172 without ripper 187 with loose Vertical 30, lateral 25 blade vertical incline driving speed, 4 forward 5 gears, 4 backwards, bulldozing plate width, length, width, height, etc. 2 main structural features and working principle 2.1 transmission system 408 type bulldozer drive system by engine The main clutch of the clutch is composed of steering clutch and final drive.
The engine adopts the vertical water-cooling stroke produced by Shanghai Diesel Engine Factory. Hydraulically assisted operation greatly reduces the operating force.
The steering clutch is a wet multi-piece powder metallurgy friction lining spring pressed hydraulically separated structure. The steering clutch is engaged by the combined force of the steering large spring and the steering small spring, so that the pressure plate presses the outer teeth and the inner teeth. The separation of the steering clutch is based on the hydraulic fluid of the steering hydraulic system acting on the piston, so that the piston moves toward the outside of the vehicle body, the compression steering spring and the steering spring, so that the internal teeth and the driving wheel of the external teeth of the pressure plate are no longer Compacted and realized. The steering clutch is engaged or disengaged, and the power is transmitted or cut to the left and right final drives. The right and left steering and parking brakes of the bulldozer during driving and operation are satisfied.
The final drive adopts a two-stage large displacement spur gear deceleration, so its traction is large. There are two sets of floating oil seals in the final drive to prevent external oil leakage to the outside.
2.2 Rack and walking mechanism Left and right beams of the frame The inner and outer beams of the walking frame are of the box type structure, so that they have enough strength and rigidity, and can withstand the huge impact load of the bulldozer during driving and operation, and the whole is increased. The body's stability during machine operation reduces vibration.
The walking mechanism is respectively composed of a walking frame roller guide wheel carrier sprocket crawler tensioning device and a track assembly and the like. 1. Guide wheel 2. Walking frame 3. Track assembly 4. Track tensioning device 5. Roller wheel 6 7. Carrier chain wheel 7. Shaft end shield The walking system adopts a semi-rigid suspension mechanism. The middle and both ends of the balance beam are supported by rubber springs, which improves the vibration damping performance of the whole machine and reduces the impact of the ground on the mechanical parts. This improves the smoothness of driving and also improves the driver's working conditions. The trolley frame is a swing type beam, the guide wheel adopts spring buffer, the hydraulic cylinder is tensioned, and each side trolley is equipped with 4 unilateral rollers, 2 bilateral rollers, 2 carrier rollers, and 2 guide rollers. There are floating oil seals on both sides of the heavy wheel and carrier chain wheel.
2.3 Working hydraulic system and working device operating principle of hydraulic system 2.
1. Oil filter 2. Working hydraulic pump 3. Pilot hydraulic pump 4. Pilot safety valve 5. Working oil tank 6. Sequence 7. Production knife cylinder 8. Check valve 9. Ripper cylinder 10. Dispense valve. Pilot Operated Valves 12. Safety Valves 13. Pilot Operated Check Valves The 403 Bulldozer Hydraulic System is an open system that consists of a hydraulic pump distribution valve blade lift cylinder and a ripper hydraulic cylinder. The working device is controlled by pilot operation, including pilot pump inlet check valve sequence valve and pilot operated valve. Hydraulic oil pump sucks oil from the oil tank. The pumped pressure oil enters the distribution valve. The distribution valve is a double spool valve, and the valve stem moves. Pilot operated hydraulic oil control. When the valve stem is in the neutral position, pressure oil flows directly back to the tank via the distribution valve to reduce power loss and system heating. When the pilot valve controls the dispensing valve stem in the left and right working positions, the pressure oil can enter the hydraulic cylinder and the pilot valve can also make the upper and lower chambers of the blade hydraulic cylinder communicate with the oil tank to achieve blade float.
The distribution valve inlet is equipped with a main safety valve. The set pressure is set to 14. When the system is overloaded, the safety valve is depressurized and the system is protected from damage. The two oil ports connected to the distribution valve and the ripper hydraulic cylinder are equipped with overload valves to ensure that the hydraulic cylinders and pipelines will not be damaged due to excessive pressure during loose soil operation. In order to ensure that the distribution valve can still be operated when the engine is shut down, a sequence valve is installed in the inlet line of the pilot valve so that when the pilot hydraulic pump does not work, the blade cylinder or the ripper hydraulic cylinder can be used to pressurize the lower chamber pressure oil. As a power source to push the dispensing valve action.
The working hydraulic system fully absorbs the advantages of foreign advanced bulldozers. The blade lifts the front of the hydraulic cylinder and the distribution valve is external, which makes the inspection and maintenance of the system more convenient. The volume of the fuel tank is increased and the system is improved. The ergonomics are considered. Requirement: The working device is operated with advanced 2.4 working equipment. Mobile telescopic cleaning machine Xing Bingding, General Electric Research Institute of Jiangsu Province, Nanjing University of Industry and Technology, Mao Chengyu Abstract: A new type of cleaning machine that is widely used, convenient and economical is developed. It is suitable for small and medium-sized Drainage pump station to remove dirt from its trash rack. The working principle and design features of the cleaning machine structure are introduced.
Product structure With the sustained, rapid, and healthy development of China's national economy, investment in municipal environmental protection and water conservancy projects has increased year by year. In order to improve the quality of life of urban residents and strengthen environmental protection, governments at all levels build a large number of pumping and drainage stations every year.
The main factors influencing the operation of the pumping station are various kinds of dirt floating or suspended with the water. Therefore, a trash rack is installed at the inlet of the pumping station to prevent the dirt from entering the water pump. The trash rack only solves the problem of interception. The removal of dirt still depends mainly on manpower. It is not only labor-intensive and poor in safety, but it even cannot meet the cleaning requirements of the pumping station, thus matching the trash rack. At present, there are many kinds of cleaning machines used in municipal pumping stations in China, but all of them are unsatisfactory. We have done a lot of investigations and researches on existing problems and have carried out effective designs. The sewage cleaning machine is superior to the Nanjing Municipal Public Administration Bureau and fully meets the requirements of users and has wide applicability.
1 Comparison of the performance of the 26-type cleaning machine with other cleaning machines The currently used cleaning machines include grab cleaning machines, step cleaning machines, and rotary cleaning machines. These cleaning machines have different defects, such as Grab cleaners are less able to catch less dirt, more dirt and less likely to fall; stepper decontamination machines cannot afford contiguous clusters or deeper dirt under water; rotary cleaners are relatively effective. However, due to the fact that each trash rack should be equipped with a bench cleaning machine, the use of high cost, and inconvenient maintenance.
The slave 26 type mobile telescopic cleaner was designed with comprehensive consideration of the above factors, eliminating the above-mentioned deficiencies in terms of structure and performance, and making it advanced and versatile.
226 Main technical parameters of cleaning machine Trash trap specifications 0 Trash rack inclination angle Number of trash racks Grid spacing, bucket capacity 3 Maximum cleaning capacity 10 Single working cycle time Trends, trends The hot trend of health care is on the trend and openness. The hood is fully enclosed to prevent dust intrusion. The front cover is fitted with two side doors and is automatically opened by a gas spring to facilitate engine overhaul. The battery box adopts a push-pull structure, which facilitates the disassembly and assembly of the battery and the working device of the Victoria 408 bulldozer is a corner shovel type working device composed of a blade arch and a blade arm. Blades and arches are box-shaped structures, which greatly enhance their strength and rigidity. The lower part of the blade is equipped with a double blade that is approximately the length of the blade, and can be used on both sides to increase the life of the blade.
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