JPH0321840Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a slide adjustment device for a mechanical press, and more specifically to a mechanical press that uses high-pressure oil from an air-driven booster oil pump that fills the overload safety device with hydraulic oil as a driving source. This invention relates to a slide adjustment device.

First, the background of the invention will be explained.

Originally, a mechanical press is a forging machine that performs pressing work by reciprocating a slide (or ram) a certain distance using an eccentric mechanism that rotates by being driven by the rotational movement of a flywheel that has inertial rotational energy.

Therefore, it is necessary to change and adjust the height position of the bottom dead center (and at the same time, the height position of the top dead center) of the slide every time the workpiece material, type of processing, or mold changes.

Conventionally, the easiest way to adjust the slide described above is to screw the shaft (connecting, screw) of the ball joint that connects the connecting rod and the slide onto the connecting rod, and then adjust the length of the screw. This method changes the lower limit position of the slide by adjusting the height.

This method does not require good footing to perform adjustment work, and is dangerous due to heavy labor, so in recent years, remote-controlled electric adjustment devices have been used in many presses.

Typical electric slide adjustment devices include a combination of an electric motor with a brake and a worm reduction mechanism, or a combination of an electric motor with a built-in reduction gear brake and a bevel gear reduction mechanism.

However, since the electric adjustment device described above is attached to a slide that is repeatedly subjected to severe impacts, it has the disadvantage that it is prone to failure and cannot provide a highly accurate adjustment device.

The present invention has been made to solve the above-mentioned disadvantages of the conventional device, and preferred embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the vicinity of the slide adjustment device 1 of the present invention. A hydraulic chamber 11 surrounded by a hydraulic cylinder 5, a hydraulic cylinder cover member 7, and a piston 9 is provided above the slide 3. A ball joint 13 is provided at the upper part of the piston 9 and is sandwiched between the piston 9 and a ball retainer 15.

A hydraulic motor 17 is provided in an upper part of the slide 3, and a pinion gear 21 is fixed to an output shaft 19 of the hydraulic motor 17 with a key 23.
An annular gear 25 that engages with the pinion gear 21 is fixed to the ball retainer 15 described above.

A plurality of truncated conical pins 27 are installed on the outer periphery of the ball joint 13 at the height of the center of the ball, and these pins 27 are engaged with the inner longitudinal grooves 29 of the annular gear 25. There is.

Therefore, as the annular gear 25 rotates, the ball joint 13 rotates, and the connection screw 31 corresponding to the shaft of the ball joint 13 is screwed into the internal thread provided on the connecting rod 33. All the parts including the slide 3 shown in FIG. 1 move up and down to perform the above-mentioned adjustment.

Pressure oil from the hydraulic chamber 11 described above is connected to an air-driven booster oil pump 41 that supplies pressure oil to the overload balance cylinder 39 and the hydraulic chamber 11 via a piping flange 35 and a sub-plate 37.

Further, an oil tank 43 is provided between the sub-plate 37 and the slide 3.

FIG. 2 shows an example of hydraulic piping according to the present invention.

Air from the pneumatic source 45 passes through a pressure reducing valve 47, a pressure gauge 49, a solenoid switching valve 51, and then passes through a flexible pipe 5.
3, it is transmitted to the sub-plate 37 and reaches the air-driven booster oil pump 41.

Originally, this air-driven booster oil pump 41 rapidly returns oil in the hydraulic chamber 11 to the oil tank 43 through the overload balance cylinder 39 during overload to prevent damage to presses, molds, etc. This is a pump for supplying pressure oil to etc.

That is, in the booster oil pump 41, when the solenoid switching valve 51 is in a demagnetized state, its piston 55 is urged upward by the bullet 57, and the air above the piston 55 pushes the solenoid switching valve 51. It passes through and escapes into the open air.

The oil in the oil tank 43 is transferred to the strainer 5
9 and a check valve 61, and is sucked into a pressure intensifying chamber 63.

Next, when the solenoid switching valve 51 is energized, the piston 55 of the booster oil pump 41 receives air pressure on its upper surface, so the piston 55 overcomes the biasing force of the bullet 57 and descends, and the oil in the pressure increase chamber 63 is
The water flows out toward the check valve 65 of.

The pressure oil that has passed through the second check valve 65 from the pressure increase chamber 63 is
When the solenoid switching valve 67 is in the closed state as shown in FIG. 2, the third check valve 6
9 to the hydraulic chamber 11 of the hydraulic cylinder 5 and the lower end surface of the plunger 71 of the overload balance cylinder 39.

In the overload balance cylinder 39, a pressure increase action based on the biasing force of the bullet 75 that presses down the built-in piston 73 acts on the lower surface of the plastic gear 71, and the hydraulic chamber 11
However, if an overload occurs in the hydraulic chamber 11, the plunger 71 is pushed up and the oil returns to the oil tank 43.

Now, the use of the booster oil pump 41 described above to send oil into the hydraulic chamber 11 of the hydraulic cylinder 5 and the lower end surface of the plunger 71 of the overload balance cylinder 39 is not recommended when restarting press work after an overload has occurred. Slide adjustment is not something that is done frequently, but must be adjusted every time the plate material or mold is changed.

As is clear from the piping diagram in FIG. 2, if one solenoid of the solenoid switching valve 67 is energized while the booster oil pump 41 is kept operating, the hydraulic motor 17 will be operated from A to B or from B to A. Since the oil flows and is discharged into the oil tank 43, the connection screw 31 is rotated in a certain direction as shown in FIG. 1, and the entire slide 3 is raised or lowered to make the desired adjustment. .

Note that an accumulator 73 is provided between the booster oil pump 41 and the solenoid switching valve 67,
Pulsations in the oil pressure sent from the booster oil pump 41 are smoothed out.

As can be understood from the above description of the embodiments, in short, the present invention moves the hydraulic motor 17 for rotating the connection screw 31 connected to the slide 3 in order to vertically adjust the slide 3 in a mechanical press. 3, the air booster oil pump 41 and the hydraulic motor 17 for supplying hydraulic oil to the overload safety device in the mechanical press are connected to the switching valve 67.
The switching valve 67 and the pump 41 are connected to each other through an oil passage, and an accumulator 73 for smoothing the pulsation of the oil pressure sent from the pump 41 is connected to the oil passage.

As is clear from the above configuration, in the present invention, the air booster oil pump 41 for supplying hydraulic oil to the overload safety device of the mechanical press is connected to the hydraulic motor 17 for rotating the connection screw 31. However, an accumulator 73 for smoothing the pulsation of the oil pressure sent from the pump 41 is connected to the connecting oil path.

Therefore, in the present invention, the hydraulic motor 17
The rotation of the slide 3 is performed smoothly, and the vertical adjustment of the slide 3 in the mechanical press can be performed with high precision.

By the way, if the hydraulic motor 17 is simply connected to the air booster oil pump 41, the pulsation is large and smooth rotation cannot be obtained, but in the present invention, by providing the accumulator 73, the problem of the pulsation of the pump 41 is solved. Therefore, the conventional pump 41 can be used as a drive source for the hydraulic motor 17.

It is also clear that the design can be easily changed without departing from the technical idea of the present invention.

[Brief explanation of the drawing]

Figure 1A is a sectional elevational view of an embodiment of the slide adjustment device including the slide, Figure 1B is a plan view of only the hydraulic motor portion of Figure 1A, and Figure 2 is an example of the hydraulic piping of this device. be. (Explanation of symbols representing main parts of the drawings) 1...Slide adjustment device, 11...Hydraulic chamber, 13...Ball joint, 17...Hydraulic motor, 31...Connection screw, 39...Overload Balance cylinder, 41...Booster oil pump, 67...
...Solenoid switching valve.

Claims (1)

[Scope of utility model registration request] In order to vertically adjust the slide 3 in a mechanical press, a slide adjustment device is provided in which the slide 3 is equipped with a hydraulic motor 17 for rotating a connection screw 31 connected to the slide 3, and an overload safety device in the mechanical press is provided. An air booster oil pump 41 for supplying hydraulic oil and the hydraulic motor 17 are connected via a switching valve 67, and the pump 41 is connected to an oil path connecting the switching valve 67 and the pump 41. A slide adjustment device for a mechanical press, characterized in that it is connected to an accumulator 73 for smoothing hydraulic pulsations.