JPH0644558Y2 - Counter balancer pressure adjusting device for press machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to an improvement of a counter balancer pressure adjusting device of a press machine.

(Prior Art) Conventionally, when replacing a die of a press machine, an air pressure commensurate with the weight of the upper die is obtained from the counter balancer capacity diagram in the counter balancer adjusting device, and the operator turns the regulator adjusting handle while looking at the pressure gauge, The pressure of the counter balance cylinder was set to a predetermined value.

(Problems to be Solved by the Invention) By the way, the above-mentioned conventional counterbalancer pressure adjusting device has a problem that it requires manpower and adjustment takes time.

In order to solve the above problems, an object of the present invention is to incorporate a control device and a pressure sensor into a control circuit for adjusting the counter balancer pressure, and automatically adjust the pressure of the counter balance cylinder to adjust the counter balancer pressure of the press machine. To provide a device.

[Means for Solving the Problems] (Means for Solving the Problems) In order to achieve the above object, the present invention is a counterbalancer pressure adjusting device at the time of mold replacement in a press machine, which is an upper pressure chamber of a counterbalancer cylinder. A first electromagnetic switching valve provided with a pressure sensor is connected to the side of the counter balancer, and a second electromagnetic switching valve is connected to the lower pressure chamber side of the counter balancer cylinder via a channel. A negative pressure value is detected by the pressure sensor, a detection signal thereof is input, and a current signal having a difference from a preset setting value is sent to the second electromagnetic switching valve to output the pressure in the lower pressure chamber of the counter balancer cylinder. A counter balancer pressure adjusting device for a press machine is constructed by connecting a control device for adjusting the above to the first and second electromagnetic switching valves.

(Operation) By adopting the counter balancer pressure adjusting device of the press machine of the present invention, the pressure of the counter balance cylinder is automatically adjusted. Thus, the manpower is not required when exchanging the mold, and the adjustment time can be shortened, so that the productivity can be improved.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 3, a slide 7 that moves up and down along slide guides 5A and 5B is provided on the upper portion of the frame 3 of the press machine 1. This slide 7 and crankshaft 9
A connecting rod 11 is connected between and, and one end of the crankshaft 9 is connected via a gear mechanism 13 to a drive device (not shown).

An upper sub-plate 15 having an upper die (not shown) is detachably attached to the lower surface of the slide 7, and a bed 17 is integrally attached to the lower portion of the frame 3. A bolster 21 to which a lower sub-plate 19 having a lower die (not shown) is detachably mounted is placed on the top of 17.

FIG. 4 shows a specific configuration of the pneumatic counter balancer device provided on the slide 7. That is, in FIG. 4, the spherical bearing 2 is provided above the slide 7.
3, 25 are locked by a flange 27, and a spherical portion 31 of a connecting screw 29 is mounted in the spherical bearings 23, 25 and rotatably supported. This connecting screw
29 is locked to the connecting rod 11 by a lock nut 33, and the upper part of the connecting rod 11 is divided into two parts, which are engaged with the crankshaft 9 by a tightening bolt 35 and are vertically rotatably provided.

In the counter balancer device CB, a tip end of a piston rod 43 engaged with a piston 41 of a counter balancing cylinder 39 provided on the frame 3 is locked to a bracket 37 fixed to the side surface of the slide 7.

With the above configuration, by adjusting the air pressure supplied to the counter balancing cylinder 39, it is possible to balance the weight of all the members locked to the slide 7 including the upper mold (not shown).

FIG. 1 shows a pneumatic circuit diagram of a counter balancer pressure adjusting device at the time of mold replacement, which is provided in the middle of a pipeline of compressed air supplied to the counter balancing cylinder 39.

Referring to FIG. 1, on the lower pressure chamber 47 side of the counter balancing cylinder 39 for balancing the upper die member 45, a compressed air generating source 49 provides a conduit H1, an electromagnetic proportional valve 51, and a conduit H2.
And the pipeline H3 is connected via the electromagnetic switching valve 53. A pressure switch, which is a pressure sensor 55, is provided in the conduit H4 between the electromagnetic proportional valve 51 and the electromagnetic switching valve 53, and the pressure sensor 55 detects the pressure downstream of the electromagnetic switching valve 53. The solenoid proportional valve 51 is operated.

On the other hand, on the upper pressure chamber 57 side of the counter balancing cylinder 39, an electromagnetic switching valve 59 is connected and provided via a conduit H5, and the electromagnetic switching valve 59 is provided with a pressure sensor 61 via a conduit H6.
Is equipped with a pressure switch. The pressure sensor 61
The electromagnetic switching valve 51 is connected to a PC (programmable controller) 63 as a control device. The pressure sensor 61 detects a negative pressure value in the upper pressure chamber 57, the detection signal is input to the PC63 and the current value signal of the difference from the set value is supplied to the lower pressure chamber 47 side of the counter balancing cylinder 39. The air pressure supplied to the solenoid proportional valve 51 provided and adjusted to the lower pressure chamber 47 is adjusted.

The operation of the above configuration will be described with reference to the flowchart shown in FIG.

First, the necessity of adjustment is determined. (Step S
1).

In the state of normal work that does not require adjustment, the solenoid selector valve 59
When it is turned off, it is opened to atmospheric pressure, and when the pressure sensor 61 is also turned off, it becomes atmospheric pressure, the solenoid proportional valve 51 is set to a steady pressure, and a predetermined air pressure is sent to the solenoid switching valve 53. The electromagnetic switching valve 53 is OFF, and a predetermined air pressure is sent to the lower pressure chamber 47 of the cylinder 39, and the press work is being performed. (Steps S2, S3).

At the time of mold replacement that requires adjustment, the mold is removed from the slide 7 (step S4), and the pressure in the lower pressure chamber 47 of the cylinder 39 is set to the solenoid switching valve 53 in order to set the balance pressure without the mold. Switching and pulling (step S5), solenoid proportional valve
The pressure setting of 51 is set to 0 (step S6).

Next, when the pressure in the lower pressure chamber 47 of the cylinder 39 reaches the atmospheric pressure (step S7), the electromagnetic switching valve 53 is switched to the OFF state for normal operation (step S8). In this state, it is determined whether the pressure sensor 55 is equal to or higher than the set pressure (step S
9) If the pressure is lower than the set pressure, increase the pressure of the solenoid proportional valve 51 until the pressure sensor 55 is turned off (step S10), and turn on the solenoid operated directional control valve 59 when the pressure is equal to or higher than the set pressure (step S11). ).

Then, a die used for the next processing is attached to the lower surface of the slide 7 (step S12), and it is determined whether or not the adjustment start is OK (step S13).

When the mold is attached, the piston 41 of the counter balancer cylinder 39 descends and the upper pressure chamber 57 tries to become a negative pressure, but the negative pressure value is detected by the pressure sensor 61, and the detection signal is detected by the PC.
Enter in 63. In the PC 63, the input detection signal is compared with a preset atmospheric pressure signal, and the current value signal of the difference is input to the solenoid proportional valve 51 to increase the pressure (steps S14, S15).

After the upper pressure chamber 57 of the cylinder 39 becomes atmospheric pressure, the electromagnetic switching valve 59 is turned off and opened to the atmosphere, and all adjustments are completed and operation is possible in the normal state (steps S16, S1
7).

With the above-described operation, it is not necessary to measure the weight of the mold in advance, and the pressure of the counterbalance cylinder 39 can be automatically adjusted only by mounting the mold on the slide 7, so the adjustment time can be greatly shortened and the labor required. Can be omitted.

Needless to say, the present invention is not limited to the above-described embodiments, and various changes can be made without departing from the scope of the invention.

[Structure of the Invention] As will be understood from the above description of the embodiment, according to the present invention, the pressure sensor and the control device are incorporated in the pneumatic control device for operating the counter balancer cylinder to control the cost in advance. It is not necessary to measure the mold weight, the pressure of the counterbalance cylinder can be automatically adjusted, and the adjustment time can be shortened without the need for manpower when exchanging the mold, so that the productivity can be improved.

[Brief description of drawings]

FIG. 1 is a pneumatic circuit diagram according to the present invention, and FIG. 2 is a flow chart according to the present invention. FIGS. 3 and 4 show a press machine according to an embodiment of the present invention, FIG. 3 is a front view, and FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 1 …… Press machine 39 …… Counterbalance cylinder 47 …… Lower pressure chamber 51 …… Electromagnetic proportional valve 53 …… Electromagnetic switching valve 55 …… Pressure sensor 57 …… Upper pressure chamber 59 …… Electromagnetic switching valve 61 …… Pressure sensor 63 …… PC

Claims (1)

[Scope of utility model registration request] 1. A counter balancer pressure adjusting device for replacing a die in a press machine, wherein a first electromagnetic switching valve equipped with a pressure sensor is connected to the upper pressure chamber side of a counter balancer cylinder via a pipe line. Is provided by connecting a second electromagnetic switching valve to the lower pressure chamber side of the counter balancer cylinder via a pipe line, the negative pressure value is detected by the pressure sensor, and a detection signal thereof is input and preset. A control device for sending a current signal of a difference from the set value to the second electromagnetic switching valve to adjust the pressure in the lower pressure chamber of the counter balancer cylinder is connected to the first and second electromagnetic switching valves. A counter balancer pressure adjusting device for a press machine, which is provided.