SU1230865A1 - Mechanical press pusher - Google Patents

Description

The invention relates to forging and pressing machinery, designed to push stamped parts from the upper half of the stamp and can be applied to any crank press.

The aim of the invention is to simplify the design of the ejector.

The drawing shows the ejector of a mechanical press (general view) with a vertical section of one hydraulic seal.

The pusher has two hydraulic stops 1 fixed on the bed 2. The walls 3 of each hydraulic blank are hollow and form an additional annular container 4, inside of which is mounted the rod 5 with the piston 6. In the rod 5 there is a reverse controlled valve 7, blocking the bypass holes 8 in a piston 6 serving to communicate the piston cavity 9 with the rod cavity 10. The rod cavity 10 communicates with the container 4 through the opening 11 in the wall 3. The control of the return valve 7 is performed by the rod 12 with the spring 13 installed on it, With an adjustable stop 14 mounted on the slider 15. To reduce the effort to open the check valve 7, as well as to reduce the force on the adjustable stops 14, the reverse controlled valve 7 has a discharge piston 16 to which liquid flows through the hole 17 in the control rod 12 From the piston cavity 9. A safety valve 19 is installed in the top cover 18 of the hydraulic seal 1 for protection against overload. A hole 20 is formed in the cover 18 to communicate the tank 4 with the atmosphere.

In the window of the slider 15, a beam 21 is connected to the rods 5 of the hydraulic stops 1 and interacting with the pushers 22. In the initial upper position the beam 21 with the pushers 22 is held by springs 23.

The device works as follows.

When the press is turned on, the slider 15 from the top dead center together with the beam 21, the pushers 22 and the rods 5 starts to move downward, while a vacuum occurs in the piston cavity 9, as a result

five

0 0 5

0

At the same time, the return controlled valve 7 opens and through the through holes 8 of the piston 6, the piston cavity 9 is filled with liquid. Liquid into the piston cavity 9 comes from the container 4 through the holes 11 in the rod cavity 10. The piston cavity 9 is filled until the dead dead by the slider 15. the points where, under the action of the spring 13, the reverse controlled valve 7 is closed. When the slide 15 moves upwards, the rods 5, the beam 21 and the pushers 22 remain stationary, as they are kept in the initial position by the springs 23 and the fluid pressure generated in the closed volume of the piston cavity 9, increasing in proportion to the amount of ejection force ejected from the stamped part of the upper half of the stamp. Adjustable stops 14 fixed on it move together with the slider 15. The pushers 22 exit until the stops 14 are pressed onto the control rods 12 of the reverse controlled valve 7, as a result of which it opens. Further movement of the slide 15 to the top dead center is accompanied by the displacement of fluid from the piston cavity 9 into the container 4 through the rod cavity 10 by the piston 6, which moves together with the rods 5, the beam 21, the push rods 22. The liquid is displaced until the upper dead point is reached. During the next run of the slider 15, the cycle is repeated.

To protect the mechanism from overloading, the safety valve 19 is adjusted to the highest operating pressure. When this pressure is exceeded, the fluid from the piston cavity 9 through the safety valve 19 is discharged into the container 4.

The adjustment of the stroke of the followers 22 is carried out by the adjustable stops 14 by changing the distance H between the control rods 12 and the adjustable stops 14.

Performing the main actuator in a single unit, the hydraulic seal, simplifies the design and shortens the repair time.

Claims (1)

PUSHER OF MECHANICAL PRESS, including a bed and a slider, comprising a beam with pushers mounted on the slider with the possibility of moving along its longitudinal axis, adjustable stops rigidly fixed on the slider and hydraulic supports pivotally mounted on the bed, each of which is made in the form of a case with a closed cylindrical tank, inside which is installed with the possibility of movement along its longitudinal axis of the rod with a piston dividing the container into a piston and rod cavity, and the hydrostuff rods are pivotally connected to alcoy, characterized in that, in order to simplify the design, each hydraulic seal is equipped with a check valve installed inside the stem and serves to connect the piston and rod cavities of the tank with a control rod spring-loaded relative to the rod, the body walls of each hydraulic seal are hollow with the formation of an additional annular tank connected with a rod cavity, and the pushers are spring-loaded relative to the slide, while the said control rods are installed with the possibility of interaction with adjustable devices ramie. SU „„ 1230865