The gears on the bed and the rack on the trolley are difficult to ensure the clearance on the tooth side during installation. The machining and installation errors of the track on the bed are likely to cause uneven force on the gears, causing local wear of the teeth; long-term operation will result in Severe wear of rails, wheels or racks; the bounce of the cart during sawing of the steel pipe will destroy the normal meshing relationship of the rack and pinion; if the rack and pinion is severely worn, the gap on the flank will be too large, when the car reciprocates Excessive impact will occur during sports; serious wear of the track and wheels will cause the trolley to move down, resulting in a smaller gap on the flank, which will destroy the lubrication of the tooth surface and cause premature failure of the tooth surface; if the wear is severe, the gear will be stuck. Affect normal production. Determine the position and mitigate the impact on the teeth during start and brake.
Fixed gear floating rack drive This type of transmission, the gear is fixed on the bed body, the rack and the trolley adopt floating connection, that is, the moving direction is positioned by the positioning block, and the rack is relatively movable in the radial direction of the gear. The function of the spring is to press the rack with a certain pre-tightening force on the rack guide frame and the guide wheel on the guide frame to position the rack in the up, down, left and right direction to ensure the correct meshing relationship of the rack and pinion. Since the transmission device is in non-rigid contact with the trolley, the sawing vibration does not affect the rack, and the backlash is easily ensured during installation. Wear of the track and wheels does not affect normal engagement. However, the rack of nearly 3m requires 57 rack guides to support and guide, and each guide frame is independently mounted on the bed body, so the installation accuracy is difficult to guarantee. Due to the reciprocating work of the trolley, the intermittent contact between the rack and the guide frame causes the collision between them to occur frequently, and the influence of the flushing of the cooling water and the sawdust causes the guide wheel of the guide frame to be frequently damaged, and the guiding effect is lost and the normal effect is affected. jobs.
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