SU1646900A1 - Device for protecting crank presses against overloads - Google Patents

Abstract

The invention relates to forging machinery, in particular, to devices for protecting crank presses from overloading. The purpose of the invention is to reduce overall dimensions and increase speed. The working load from the connecting rod 3 is perceived by four reel 8 cranes through the movable support 2 and the pressure plate 4, after which the load is transferred to the springs 9. With an increase in the pressing force beyond the nominal four starter 8, they change their original shape. The springs 9 are stretched, and the four bridges 8 are lowered by a predetermined amount, which is the course of the roll overload protection. 5 il.

Description

3 .1

The invention relates to the field of mechanical engineering, in particular to the design of forging and pressing mechanical engineering.

The purpose of the invention is to reduce overall dimensions and increase speed.

Figure 1 shows the device, a general view; Fig. 2 shows an elastic element until the device triggers; Fig. 3 shows the elastic element after the device has been activated; figure 4 is a view of And figure 2; figure 5 - view B in figure 2.

A device for protecting the crank press from overload is installed in the cavity of the press ram 1 under the movable support 2 and the connecting rod 3. The pressure plate 4 is located in the housing 5 and has the ability to move in the direction of action the force together with the mobile support 2. In the plates 6 and 7 are made grooves for installation of elastic elements 8, each made symmetrically with respect to the vertical axis of the quadruple. The elastic elements 8 are arranged with alternating sharp and obtuse angles. The spring 9 of returning the elastic elements to their initial position is installed inside each of the four partitions. The device is equipped with a cover 10.

The device works as follows.

The workload from the connecting rod 3 through the movable stopper 2 and the pressure plate 4 is perceived by the four-linkage, after which the load is transferred to the springs 9

(figure 2). With an increase in the press force beyond the nominal, the four-shafts change their original shape, while the springs 9 are stretched and the four-shafts are lowered by the amount h, which is the course of protecting the press against overload (FIG. 3). After the overload has been removed, the springs 9 are compressed and the four-berths assume their original position.

The technical and economic effect from the introduction of the proposed invention in comparison with the known one is provided by reducing the overall dimensions and improving the speed.

Claims (1)

Claims Device for protecting a crank press from overload, containing at least three elastic elements installed between the hanger of the connecting rod of the press and its crawler, each in the form of a four-bar symmetrical with respect to the direction of movement of the ram, and return spring elements, characterized in that , in order to reduce overall dimensions and increase speed, in each of the elastic elements in the direction of movement of the slide two links are mounted to form a the two angles between them, the other two links form an acute angle, with the return springs mounted inside the elastic elements, and the latter are installed with alternating sharp and obtuse angles in the direction of movement of the slider. View L J Buds