There are two types of bulldozers: crawler and tire. The mine mainly uses crawler bulldozers. Because the crawler bulldozers have large attachment traction force and low ground contact pressure (0.04～0.13 MPa), they have strong climbing ability but low driving speed. Crawler bulldozer has the characteristics of flexible operation, large traction, wide application range, etc. It is mainly suitable for the shallow excavation and short transportation of type 1 to 4 soil, such as site cleaning or leveling, excavation of foundation pits with small depth and backfill, and the height of push construction is not Great roadbed. In the road construction, the crawler bulldozer can complete the treatment of the base of the roadbed. The roadside borrowing laterally adds an embankment with a building height of ≤ 1 m, and transfers to the shoveling along the center line of the road. Build a subgrade with half embankment and half cut. In addition, the bulldozer can also be used to level the site, accumulate loose materials, and remove obstacles in the working area.

　　1：Crawler and track pin crawler bulldozer is mainly composed of driving wheel, guide wheel, support chain wheel, roller, driven wheel and crawler. The crawler is the main walking system of the bulldozer. The track is generally composed of track shoes and track pins. The track pins connect the left and right track shoes to form a complete track ring. There is a pin sleeve in the middle of the chain plate, which meshes with the driving wheel to drive the track. The side of the track plate that contacts the ground has a reinforced anti-skid rib (abbreviated as a pattern) to improve the firmness of the track plate and the adhesion of the track to the ground. The metal pin crawler has a simple structure, the pin and the pin hole are directly frictionless, and the wear is fast and the life is short. In the maintenance of bulldozers, it is often found that the track pin is worn, and the track pin is one of the wearing parts. Due to the long service life of the company's excavator track pins, serious wear problems have occurred, so it is often necessary to disassemble and replace the track pins. The current method is to weld a handle in the middle with an iron bar smaller than the track pins. One person held the pin with an iron bar, and the other beat with a sledgehammer. After several beats, the pin was disassembled and the disassembly of the track pin was completed. This is likely to cause personnel fatigue, and it is also easy to damage links and pin accessories. The common method of replacing track pins and pin sleeves is knocking and disassembling, which has the problems of unsafe and easily damaged.

　　2： The design principle and effect of the track pin disassembler through independent research and development design a track pin disassembler (Figure 1), the disassembler overcomes many unfavorable factors on site, simple structure, small size, easy assembly, easy adjustment , Easy to adapt to various construction sites. It can facilitate disassembly and assembly, facilitate on-site operation, save installation time and cost, facilitate installation workers to learn on-site, and reduce the labor intensity of installation personnel. Adjustment bolt holes are symmetrically arranged at four corners of the first bottom plate and the second bottom plate of the track pin detacher, and the first bottom plate and the second bottom plate are connected and fixed by four adjustment bolts. The first bottom plate is provided with jack installation holes and jacks A pressure block is provided at the end of the ejector rod, and the outer size of the pressure block corresponds to the outer size of the pin being pressed. The second bottom plate is provided with an adjustment hole. An adjustment plate with a pin hole is placed on the adjustment hole. The hole type is the same as the pin type being pressed. The technology of the utility model provides a track pin disassembling device which is safe and convenient to disassemble and prevent other components from being damaged. The track pin disassembler has low cost, convenient disassembly and assembly, and wide practical range. It can also be used freely in harsh environments and can be widely used in mining engineering, machinery and other engineering vehicles, especially in the excavator track pin Technical field of disassembly. The press-fitting mechanism strengthens the stability of the pin press-fitting, which not only protects the safety of personnel, but also effectively protects the equipment. At the same time, the quick turning wrench tool can provide greater bearing capacity, thereby improving the safety of various press-fitting equipment and improving Safety of operation, repair and maintenance under on-site conditions. It shortens the debugging time of each equipment of the operator by about 3 hours and improves the operation efficiency. Every day to improve the operation efficiency and save costs, excavator: 10 000 yuan/8 h×3 h=3750 yuan, labor: 300 yuan/person×2 people=600 yuan, (3750+600)×6×2=52 200 yuan, The track pin disassembler can save 52.200 yuan per year. The advantages of the track pin disassembler: ① No one needs extra personnel to help, one person can complete the installation and commissioning; ② The structure is easy to disassemble and easy to understand; ③ The manufacturing process is simple, easy to purchase and process on the spot, can be combined and applied, and is convenient for long distances Transportation, easy to mechanize operation, low manufacturing cost, save time, effort, and people; ④ Use this tool to disassemble and disassemble the track pin, which is labor-saving, safe, comfortable to hold, easy to operate, and protect equipment.

　　3 ：On-site installation and use method Working process: transport the track pin disassembler to the site, select the appropriate adjustment plate with pin holes by observing the on-site pins that need to be press-fitted, install the adjustment plate and the second bottom plate, and put The second bottom plate is placed on the inside of the track. According to the pins that need to be press-fitted on site, select a suitable jack pressure block that is smaller than the pin, install the jack with the first bottom plate, and place the first bottom plate on the outside of the track through 4 corners The adjustment bolt is adjusted, and the jack is used to press the pin after the adjustment is completed, and the work is completed after the pin is pressed out.

　　In summary, through the above improvements, the use of this method on-site operations can save time, ensure normal production, and avoid personal injury, so this method is worthy of promotion and application.