The maximum lifting height of the boring machine spindle is the maximum load of the working table; and the center hole spacing of the part is more than 1000mm, and the weight is beyond the processing range of the boring machine. Because the above scheme is not feasible, after careful research and analysis, it is decided to use the existing equipment radial drilling machine instead of the boring machine to solve the problem of large size and heavy weight of the component. In order to complete this processing and repairing task, we specially designed and made the special tool holder and positioning plate of Z3063 radial drilling machine to realize the processing and repair of this part. The special arbor and positioning plate are designed and manufactured with special arbor-specific shank, which is forged by 230mm round steel. The upper part of the arbor is processed into a Mohs taper shank which is connected with the spindle hole of the radial drilling machine. The middle part 2 of the shank is processed into a cylindrical shape, and the square hole which is processed into a 20 mm 20 mm in the middle of the cylindrical shape is used for the clamping tool, and the bolt 5 is used. Perform the fastening tool. The hole hole cutter for machining the square hole, the lower part 4 of the cutter bar is the guide hollow 50 hole M is used for storage and chip removal during the processing; the component stop and the positioning plate are fastened by the screw; the hole on the positioning plate is arranged The copper sleeve is set with a copper sleeve and an oil storage tank is added in the middle of the copper sleeve to store oil to prevent dry grinding and locking of the cutter shaft and the copper sleeve of the positioning disc during the processing. Bolt hole; positioning plate stop; row cutting hole; guide copper sleeve positioning plate 3 tool geometry selection Because the center hole of the shovel base is repaired with ordinary J422 welding rod, the material is soft, rough machining is interrupted cutting, boring The material of the tool should be selected from ordinary high-speed steel W18Cr4V; the front angle should be 2030, which reduces the cutting force and cutting heat; the back angle should be selected; the main angle is selected to reduce the cutting resistance and avoid vibration, and the secondary declination is selected to reduce Small depth of cut resistance allows chips to be discharged along the surface to be machined. The processing process and measures repair the center hole of the workpiece wear, measure the machining allowance to 5mm right; flip the 180 bottom surface upward, and install the processed positioning plate on the end of the center hole end hole of the base frame, with M18 screw The positioning plate is fastened; then the platform base is turned over, and the lifting platform is placed on the working table of the rocker drilling machine, and the jack and the wooden pier are used for bearing leveling, and then the special tool bar is fixed on the rocker drill main shaft, and the special purpose is made by the wedge iron. The cutter bar is locked with the spindle of the drill press to prevent the weight of the cutter bar from falling; the dial gauge is sucked on the special cutter bar, and the alignment is performed on the basis of the plane of the base frame, so that the workpiece is perpendicular to the spindle rotation center of the drill press; The accuracy should be controlled within the range. Insert the special shank guide part into the locating hole to fix the arbor, but ensure that the special arbor and the locating disc rotate freely; the shank guiding part and the 145mm hole of the locating disc fit the gap, then the rocker drills the column, The beam is clamped and fixed to the trolley. The center hole of the part is repaired and welded, its diameter and size are different, and the cutting allowance is not uniform. Therefore, the cutting speed and the feed amount should not be too large during the machining process. If the cutting speed and the feed amount are too large Large, it will produce resonance phenomenon, which will affect the machining accuracy and cause damage to the machine tool. There have been problems for several years. In actual use, especially in winter, due to the cold weather, the air supplied by the auxiliary air compressor contains water, which is carried into the quick release valve and accumulated on the valve core to freeze. When the hole is lifted to the top brake after the hole is finished, the wind in the lower chamber of the cylinder cannot be quickly discharged due to the inability of the spool to move, and the brake is still open. At this time, if the driver operates the main clutch to the walking position, the rotating car will quickly fall and cause an accident. The two chains of the lighter are broken, and the heavy ones damage the components inside the rotary car. Over the years, accidents caused by the falling of the revolving car have occurred. Improvement measures In view of this, we have improved this system through a lot of practice. The principle of the control system of the improved main lift brake is as shown. A manual three-position five-way valve was added to the driver's cab and the cylinder was changed to a double-acting cylinder. In the normal drilling operation, the two-position three-way solenoid valve can be energized and sucked, and at the same time, the handle of the manual three-position five-way valve is moved to the release position, that is, the handle is moved to the right. The compressed air enters the lower chamber, and the compression spring opens the brake for normal lifting or lowering. However, when a hole is punched and the rotary car mentions the top and needs to be braked, the two-position three-way solenoid valve can be powered off first, and then the operating handle of the manual three-position five-way valve is moved to the middle position. The moving position, that is, the handle shown is moved to the left. At this time, the compressed air supplied by the auxiliary air compressor enters the upper chamber of the cylinder through the manual three-position five-way valve, and the compressed air in the lower chamber of the cylinder can be discharged by manually controlling the three-position five-way valve. Under the combined action of the compression air and the spring force, the piston rod is moved down to achieve braking. Therefore, when a hole is required to move the car and the main clutch is operated to the walking position, there is no accident that the rotating car is slipped due to the brake not working. Played a double insurance role. 1-hand control three-position five-way valve; 2-two-position three-way solenoid valve; 3-fast bleed valve; 4-double-acting cylinder improved main lift brake control system principle 4 conclusion through the main lift brake control system The improvement enhances the safety and reliability of the work of the main lifting mechanism, avoids the occurrence of the falling car accident, reduces the unnecessary waste of the cost, reduces the labor intensity of the maintenance workers, and achieves a good economic operation effect. Re-insert the copper sleeve with the actual size of the hole, and insert three fixing screws between the copper sleeve and the center hole of the base frame to make the center hole of the base frame repair and meet the original requirements. Conclusion After the center hole of the part has been repaired, the requirements for use are fully met. This processing method has a short repair time, saves a lot of money, and has been applied and promoted to solve the practical problems in the maintenance of mine equipment. The downside is that the control of the depth of the knife is achieved by the length of the tool. The dimensional accuracy control is also difficult. It should be designed to fine-tune the upper blade structure. (Finish) Android Car DVD For Chevrolet ,Cheap Portable DVD Player ,Headrest DVD Player ,Car DVD System Car Video,Car Audio Co., Ltd. , http://www.nbcardvd.com