In the process of cutting plates using the ordinary shearing machine, the blanking personnel has been using manual feeding, measuring, and positioning methods, which is very inefficient, and sometimes the phenomenon of the incorrect size of the blanking parts due to inaccurate measurement occurs. After years of observation and research, the author invented an automatic positioning and feeding device to solve the above problems, reduce the labor intensity of the operator, and improve the work efficiency of cutting narrow plates.
Composition and principle of the automatic feeding positioning device
The device is shown in Figure 1. The application process: ① Rotate the screw and adjust the positioning plate to the saw material L on the left side of the ordinary shearing machine upper tool post to make it equal to the length of the blanking piece. ②Place the plate on the roller on the bracket so that it rests on the positioning plate. ③Turn on the ordinary shearing machine, make the upper tool post go down, and start řezání.
Principle: When the upper knife holder drives the scissors to go down to start shearing, the arm fastened to the upper knife holder of the ordinary shearing machine also moves down synchronously, and pushes the left end of the swing arm down through the pin shaft 31. At this time, the right end of the swing arm will swing upward. The pin shaft 11 will move the rack to move up along the vertical groove of the guide rail, and the gear 14 engaged with it will rotate clockwise. The inner cavity of the gear 15 is a ratchet structure. At this time, although the gear 14 rotates, the gear 15 does not turn. When the upper knife frame of the plate is cut and the scissors are driven up, the left end of the swing arm will also move up with the turning arm. At this time, the right end of the swing arm will swing downward, and the pin 11 will move the rack to move down the vertical groove of the guide rail and engage with it. The gear 14 will rotate counterclockwise, and the gear 15 will rotate counterclockwise synchronously under the action of the pawl of the gear 14, and drive the gear 23 meshings with it to rotate clockwise, and the coaxial gear 24 will also rotate clockwise. Rotate clockwise and turn the gear 16 to rotate counterclockwise. At this time, the sprocket mounted on the drum will synchronize with it and drive the drum to rotate counterclockwise. The other drums will rotate counterclockwise under the drive of the chain. The plate placed on it is fed to the left. When the left end of the plate is on the positioning plate, the plate will stop running, and at this time, the drum will rotate counterclockwise while the upper knife holder continues to move up, and it will be between the plate Sliding friction occurs and does not stop until the upper tool post stops moving upward. When the upper knife of ordinary shearing machine rest drives the scissors down again, it starts to repeat the above actions.
The focus is on the swing arm shown in Figure 2. Both ends of the swing arm must belong slots so that it can meet the free up and down movement of the pin 31 and the pin 11 in the groove during the swing process; the right end of the swing arm must be the left end Integer multiples to expand the stroke of the rack and increase the number of revolutions of the gear 14 to increase the feeding size of the sheet. There are multiple sets of coaxial holes on the bracket and the swingarm, and the position of the mounting pin 8 can be adjusted according to the size of the sheared plate.
In the process of using, it is necessary to frequently inject oil into the moving parts; but it is not suitable for the feeding situation of shearing large plates; in order to make the plate must be pressed against the positioning plate before cutting, consider carefully when adjusting the pin 8 and it must be on the top of the plate. When the positioning plate is reached, the roller will still run for more than half a circle; pay attention to the state of the plate during the cutting process to prevent the inconsistency of the plate feed caused by the difference in friction between the two sides due to warping, resulting in not all of the plates on both sides Top on the positioning plate, causing the size and width of the scissors to tilt.