SU761293A1 - Drive of external ram of double-acting crank press - Google Patents

Description

YY

--I L; · :;

I '"··". ". ·" .. g * g "and

---__· ---at"

The invention relates to the field of engineering, namely to the structures of the nodes of the crank presses.

The drive of the external slide of a double-acting crank press is known, which contains a crank with a connecting rod mounted on it, connected by means of an intermediate link with an external slide, as well as pressure cylinders which are hydraulically connected to a power source [1] ·

In the drive, the reciprocating motion of the outer slider is carried out by a crank mechanism, and its clamping is carried out by hydraulic cylinders connected to a power source.

A disadvantage of the known device is the increased length of the connecting rod due to the presence of the rocker groove and the impossibility of adjusting the magnitude of the stand angle.

The purpose of the invention is the expansion of technological capabilities by providing adjustment of the angle of dwell.

This goal is achieved by the fact that the intermediate link is made in the form of a screw with a threaded bushing, and there is a hole in the outer slider, the screw is pivotally connected to the connecting rod, and the threaded bushing is axially displaceable.

FIG. 1 shows the proposed drive; in fig. 2 - the position of the drive elements

- 5 while rotating the crank.

Drive contains outer slider 1,

drive crank 2, rigidly connected with the crank of the inner slide, mounted relative to the latter at an angle and

Yu providing the sequence of movement of the sliders. On the crank 2 has a connecting rod 3, pivotally connected to the screw 4.

In the hole of the outer slide 1, a threaded sleeve 5 connected to the screw 4 is displaceable along the axis. The drive also contains a hydraulic system including hydraulic cylinders 6 rigidly connected to the frame

20 presses, plungers 7, connected to the outer slider 1, crank multiplier 8, accumulation tank 9, safety valve 10, valve 11 and pressure gauge 12.

25 The drive operates as follows. From position I to position II (beginning of dwell), the outer slider moves down by a value of 5. In position II, the clamp is attached to the outer slider,

761293

3

in contact with the workpiece. From this point on, the outer slider is stationary, and crank 2, continuing rotation, moves through the screw 4 sleeve 5 into the hole of the slider 1. At the same time, the connecting rod 3 rotates freely relative to the center A of the hinge. In position III, the sleeve 5, falling and rising relative to the hole in the slider, returns to its original position. Since then recovered kinematic connection lead crank 2 with outer slide 1 and the latter returns to the position I. Thus, dwell process takes place during rotation of the crank shaft angle _and the value of which is determined by the stroke end of the sleeve 5 from the upper end position to the end openings in the slider and is adjusted by moving the sleeve along the screw thread.

During the idling of the outer ram down, the vacated volume of the hydraulic cylinders 6 is filled with low-pressure fluid coming from the filling tank 9 under the action of compressed air through the valve II. When this fluid from the tank 9 enters the cavity of the cylinder 6 and at the same time in the cavity of the cylinder multiplier 8.

When pressing the workpiece, the spool 11 moves to the right. When this closes the channel connecting the cylinders 6 with the filling tank 9, and in the cavity of the cylinders receives fluid from the multiplier 8. The pressure in the cylinders and the clamping force is determined by the setting of the valve 10.

15

25

35

four

The movement of the valve 11 is carried out by an electromagnet controlled by a final switch, depending on the relative position of the slide 1 and the sleeve 5.

After the inner slide, after completing the stamping, rises a certain distance from the lowest position, the cavities of the hydraulic cylinders 6 are unloaded from high pressure and are connected to the filled tank.

After returning the outer slider to position I, the cycle repeats.

Claims (1)

Claim The drive of the external slide of a double-acting crank press, which contains a crank with a connecting rod mounted on it, connected by means of an intermediate link with an external slide, as well as clamping hydraulic cylinders, which are hydraulically connected to a power source, characterized in that in order to expand technological capabilities by providing adjustment of dwell angle, the intermediate link is made in the form of a screw with a threaded sleeve, there is a hole in the outer slider, and the screw is pivotally connected to the connecting rod, and the thread The sleeve is placed in the specified hole of the outer slide with the possibility of axial movement.