SU234984A1 - FEED AND TURN MECHANISM OF COLD COOL ROLLING MILL - Google Patents

Description

Known supply and turning mechanisms for cold-rolling of pipes in Astana include a drive-through shaped cam, in which its rollers mounted on levers are driven around on both sides. The levers are via a link-lever system and roller-guard couplings connected to the feed shaft and the turn shaft.

The peculiarity of the proposed mechanism is that in order to reduce the dynamic loads, the rollers are placed relative to each other at an angle of 120 ° and are hinged by connecting rods with a crank mounted on a crank shaft, which is connected with a nodache screw through a gear system.

FIG. Figure 1 shows the kinematic diagram of the feed-and-turn mechanism; in fig. 2 - cam, with rollers.

The proposed mechanism consists of a driving cam 1, whose profile is outlined with two radii and standing R-2 from one center O. It is driven from the main drive motor 2 via gear 3, shaft 4, gear unit 5 and spindle 6, on which on the key (not shown), the cam is set. The cam rolls around the rollers 8 fixed on the swivel arms 7, which are arranged at an angle of 120 ° relative to each other in the same plane and pivotally connected by three connecting rods 9 to the crank 10 mounted on the crank shaft //. The crankshaft is connected via a gear gear system 12, 13, and 14 to a feed screw 15, which cooperates with a nut 16 fixed in the chuck of the workpiece 17. A pneumatic cylinder 18 and an electric motor 19 are installed to speed up the removal of the chuck of the workpiece.

When the cam comes in contact with the rollers in 8 sections with a constant radius ./, R, the crank shaft 11 is stationary and the system is fixed. The rotation of the crank shaft corresponds to the contact of the rollers with transition parts (angle a). The cam rotation time in these areas corresponds to the opening time of the feed opening and rotation. Since the cam profile is shaped in such a way that in one turn the rollers make a swinging motion three times around the levers 7 and through crank 9 drive the crank shaft 11 into an intermittent rotation of 120 °, i.e., during one turn of the cam, the crankshaft makes three turns by 120 °, the cam speed should be three times less than the number of double cages in Minnutu. This is accomplished by the gear gear unit 5.

Intermittent rotational movement of the crank shaft is converted through a system of gears 12-14 and feed screw 15 into an intermittent translational motion of the workpiece cartridge 17. Rotating the feed screw causes

the translational movement of the nut 16 together with the chuck of the workpiece. Simultaneously with the feed, the workpiece is rotated by means of a block of gears 12, 13 and a rotation shaft 20. The feed rate is controlled by the help of replaceable gear gears or gearboxes, similar to the existing structures on the CPPM mill.

With combined rotation and supply of a pipe, it is enough to have one such mechanism with separate rotation and supply. For a double turn, you need to have two similar mechanisms, one of which will make only a turn, and the second feed or feed and turn at the same time.

Subject invention

The feed-and-turn mechanism of the cold rolling mill tube, which includes a driven cam and interacting rollers mounted on the levers, characterized in that, with 1, reducing dynamic loads in the mechanism chain, the rollers are positioned relative to each other at an angle of 120 ° and hinge by connecting rods with a crank mounted on a crank shaft, which is connected to the feed screw via a gearing system.