Loader shaft pin to speed up the reason of abrasion and improvement

Loader shaft pin to speed up the wear and tear, 2019 - the cause and the improvement 12 - 21 Fu Liming ( Chengde days transport logistics co. , LTD. ) 1. Fault phenomenon, my company's existing ZL50F workers, 650 workers and 650 b type loader, the loader production assignments, bad operation condition, the work device of the shaft pin lack of lubrication and maintenance, not filling grease on time, cause the shaft pin to speed up the wear, replace frequently, therefore increased the company's maintenance cost, has adverse effects to the normal production. If not timely replacement shaft pin, will cause collar even accelerate shaft sleeve hole of the wear, and even cause mechanical accident. We has carried on the screen to loader shaft pin rapid wear failure, on the basis of the find out the cause of the problem put forward the improvement plan. 2. Abrasion of troubleshooting for our loader shaft pin screening results show that the bucket of the shaft pin, shaft sleeve, shaft pin, shaft sleeve, and the frequency of the rocker shaft pin and bushing wear is higher. We measured the size of the shaft pin, the result is as follows: bucket bottom two shaft pin hole diameter is 70 mm, length is 230 mm; Bucket upper shaft pin hole diameter of 80 mm, length is 210 mm; The rocker trunnion pin hole diameter of 80 mm, length is 220 mm. I the loader bucket shaft pin made by the company, the bottom shaft pin diameter of 70 mm, length is 240 mm; The upper shaft pin diameter of 80 mm, length is 239 mm ( Length including fixed plate size) 。 Some time ago to make the bucket top and rocker arm shaft pin diameter of 80 mm, length is 268 mm ( Have in stock, is still in use) 。 Measured, the collar on the inside diameter of oil are in the middle position, and the oil tank is 20 mm round out the oil hole, and different batches of shaft pin, its out of the oil hole position is uneven. To spare parts warehouse 2 batches of shaft pin shaft hole position measurement, found that bucket bottom shaft pin out of the oil hole position from the top of the shaft pin distance is 120 mm and 130 mm respectively, bucket top and rocker arm shaft pin out of the oil hole is apart from the top of the shaft pin distance is 123 mm and 130 mm respectively. 3. The cause of the problem by troubleshooting result, my company homemade shaft pin two problems: one is the shaft pin out of the oil hole axial position uncertainty, can guarantee the oil and the shaft sleeve, the corresponding position; Second, the shaft pin oil aperture to the position uncertainty, easy to use oil hole in the shaft pin stress position, caused the oil hole can't get rid of grease, cause the pin shaft and shaft sleeve can not get effective lubrication and speed up the wear and tear. Improvement in front of the shaft pin structure is shown in figure 1. Through further analysis, I shaft pin made by the company to speed up the cause of the wear and the following two points: one is the shaft pin material, processing technology and surface heat treatment, etc, there is a gap compared with the original shaft pin; The second is the operator of shaft pin lubrication and maintenance is not timely, especially difficult to pin shaft lubrication oil. 4. Improvements through research, we put forward the following six improvement solutions: one is the purchase or processing the size of the shaft pin to standards, its out of the oil hole position should be consistent with the groove on the shaft sleeve; The second is to choose high quality materials ( Such as 40 cr steel) Processing shaft pin; Third, will improve for long shaft pin round out the oil hole trough out the oil hole, and set oil hole trough grow on the other side of the shaft pin bearing parts, to reduce the shaft pin blocking probability; Fourth, choose thicker shaft pin of the hardening layer, to improve its wear resistance; Five is to replace the down wear not serious shaft pin by adopting the method of brush plating to repair, in order to reduce the maintenance cost. Six is the spare parts warehouse will inventory of different parts of the shaft pin marks its specific name and size, in order to avoid mistake packing. The improved shaft pin structure is shown in figure 2 as shown in figure. 5. Improvement effect my company loader shaft pin according to the above scheme after the improvement, shaft pin wear phenomenon disappear too rapidly. The improved under the condition of without any increase in costs, ensure the good lubrication and cooperate with the loader pin shaft and shaft sleeve, prolong the service life of the pin shaft and shaft sleeve, reduced maintenance costs, the desired effect.