JPS6354458B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention moves a set of two feed bars having a plurality of gripping claws on opposing sides three-dimensionally by sequentially operating a plurality of cylinder devices installed at both ends of the feed bar. This relates to a transfer feed device that reduces inertia during movement of moving parts such as feed bars to enable smooth forward movement, and also stores and regenerates the movement inertia of the moving parts in an air tank to reduce pressurized air. In addition to saving consumption, we would like to provide a transfer feed device that can contribute to cost reduction by reducing the number of oil pipes, and also allows arbitrary operation of each cylinder device during trial feeding, pattern matching, readjustment due to troubleshooting, etc. That is.

Hereinafter, the embodiment will be explained with reference to the drawings. In Figs. 1 to 4, numeral 1 in the drawings is an advance cylinder device for advancing or returning the feed bars 2, 2, and the cylinder device 1 is a hydraulic cylinder 1'.
and an air cylinder 1'' have working chambers in opposite directions and are connected in tandem. 3R and 3L are lift cylinder devices for raising and lowering the feed bars 2, 2, and 4R and 4L are feed bars. This is a clamp cylinder device in which the feed bars 2, 2 are operated near and far, and the material is clamped or released by the gripping claws 5, 5 attached to the feed bars 2, 2.

The lift cylinder devices 3R, 3L and the clamp cylinder devices 4R, 4L also have hydraulic cylinders 3R', 3L', 4R', 4L' and air cylinders 3R'', 3L'', 4R'', 4L'' in opposite directions. The working chambers are connected in tandem. Each hydraulic cylinder 1', 3R', 3
The working chambers of L', 4R', and 4L' include hydraulic pumps 11, 12, 13, 14, and 15 that are operated individually by rotating cams corresponding to each operation of the feed bar, and a low-pressure oil supply device 18 and an operating chamber. Two-position solenoid valves 6, 7, 8, 9, 1 that switch indoor hydraulic oil to flow out to a discharge circuit with a throttle valve 41
0 is directly connected with piping. Each of the air cylinders 1'', 3R'', 3L'', 4R'', and 4L'' has an air tank 30 for absorbing and accumulating the working gas in each air cylinder, and an air tank 30 for absorbing and accumulating the working gas in each air cylinder, and for discharging the working gas in the air cylinder to a discharge pipe with a throttle valve 40. 2-position solenoid valves 25, 26, 27, 28, 2
9 are connected by piping.

The low pressure oil supply device 18 includes an accumulator 19
, a hydraulic pump 20 that replenishes pressure oil to the accumulator 19, a pressure switch 21 that sets the pressure in the accumulator pipe line to a low pressure, and a pressure oil that is sent out from the hydraulic pump 20. The solenoid valve 22 is unloaded by the ON signal of the shift switch 21, or the electric motor 23 for driving the hydraulic pump is unloaded by the ON signal of the pressure switch 21.
It consists of an interlock circuit that controls the stoppage of the accumulator, and a solenoid valve 24 that shuts off the accumulator line. 31 is an air source that supplies pressurized gas to the air tank 30, 32 is a relief valve attached to the air tank 30, and 33 is a relief valve connected to a conduit between the hydraulic cylinder and the hydraulic pump.

34, 35, 36, 37, 38 are rotating cams,
Feed bar operations (advance and return,
The hydraulic pumps are operated in response to each operation (clamping and unclamping, lifting and downing), and are directly connected to each other on the camshaft so that the stroke points are shifted by a desired angle.

Since the transfer feed device of the present invention is constructed as described above, first, the inside of the air tank circuit is brought to a predetermined pressure state with the pressurized gas from the air source 31.
Further, low pressure oil is supplied to the pipe line 17 by a low pressure oil supply device 18.

In this state, the pressure gas in the air tank circuit acts on each air cylinder 1'', 3R'', 3L'', 4R'', 4L'', and each hydraulic cylinder 1', 3R', 3L', 4L''
R′, 4L′ hydraulic oil is hydraulic pump 11, 12, 1
3, 14, 15 and its piston rod ends 11', 12', 13', 14', 15'
are pressed against the curved peripheral surfaces of the cams 34, 35, 36, 37, and 38.

After the above preparation operations, the cams 34, 35 (36), 37 (3
8) and a drive device 39 that rotates synchronously with the press drive source.
When the hydraulic pump 11 is rotated by the cam 3,
The hydraulic pump 11 starts operating along the curved surface of the hydraulic pump 11.
The hydraulic oil inside becomes high-pressure oil and is sent to the hydraulic cylinder 1' of the advance cylinder device 1, and the advance cylinder device 1 changes the shape of the cam 34 from the time when the pressure inside the hydraulic cylinder 1' overcomes the pressure inside the air cylinder 1''. Acceleration and deceleration are continuously applied at a speed corresponding to the stroke operation to move the feed bars 2, 2 forward.

At this time, the pressurized gas in the air cylinder 1'' is returned to the air tank 30 and accumulated therein while preventing overstroke due to inertia of the moving parts such as the feed bars 2 and 2.

The cam 34 further rotates and after maintaining the stroke state for a predetermined period of time, moves to a region where the cam radius decreases, this time the pressure gas accumulated in the air tank 30 acts on the air cylinder 1'', causing the hydraulic cylinder to operate. The oil returns to the hydraulic pump 11, and the feed bars 2, 2 are sequentially accelerated and decelerated at a speed corresponding to the shape of the cam 34, and are operated back.

In this way, the pressurized gas only circulates between the air cylinder 1'' of the advanced cylinder device 1 and the air tank 30, and almost no pressure air is consumed.

Next, regarding the lift cylinder devices 3R, 3L and the clamp cylinder devices 4R, 4L, cams 35 whose operation timings are sequentially delayed together with the cam 34 are as follows.
Hydraulic pump 1 due to rotation of (36) and 37 (38)
2 (13), 14 (15) sequentially start strokes, and in response, lift cylinder devices 3R,
3L, Kump cylinder devices 4R, 4L operate in the same manner as in the case of the advance cylinder device 1, and raise and lower the feed bars 2, 2, and clamp and unclamp the material by the feed bar mounting claws 5, 5... , advance and return operations of feed bars 2 and 2 are added in a superimposed manner.

Therefore, the feed bars 2, 2 are operated three-dimensionally in the order of clamp → lift → advance → down → unclamp → return, and the material is sequentially fed by the gripping claws.

Next, we will explain the one-dimensional operation procedure of the feed bar.

In order to move the feed bars 2, 2 forward and back when the forward movement cams of each cylinder device and the hydraulic pump are stopped and the hydraulic pump 20 is sending out pressure oil, the solenoid valve 24 is first actuated by a command from the operation panel (not shown). and shut off the accumulator line.

Next, the two-position solenoid valve 25 is activated. With this operation, the air cylinder 1″
is communicated with the atmosphere through a position valve 25', and pressure oil sent from a hydraulic pump 20 is introduced into the hydraulic cylinder 1', and the advance cylinder device 1 is stroke operated to advance the feed bars 2, 2. At this time, air cylinder 1″
The internal pressure gas is discharged into the atmosphere through the throttle valve 40, but normally the throttle valve 40 does not work because the stroke speed of the advance cylinder device 1 is slow. Next, when the two-position solenoid valve 6 is activated by a command from the operation panel (not shown), the position valve 6' connects the pipe line, and the two-position solenoid valve 25 is restored, and the hydraulic cylinder 1'
communicates with a tank port equipped with a throttle valve 41,
Pressure gas inside the air tank 30 is introduced into the air cylinder 1'', and the advance cylinder device 1 is operated to contract, thereby returning the feed bars 2, 2. At this time, the hydraulic cylinder 1' of the advance cylinder device 1
The internal hydraulic oil is discharged from the tank through the throttle valve 41,
The return speed of the feed bars 2, 2 is adjusted by this throttle valve 41.

Then, when the command from the operation panel (not shown) is released, the solenoid valves 6, 24, and 25 are restored.

The operating procedures for the one-dimensional operation of lifting and lowering the feed bars 2, 2, and the one-dimensional operation of clamping and unclamping are the same as the above-mentioned advance and return one-dimensional operating procedures.

In the above embodiment, the cylinder device was configured with a hydraulic cylinder and an air cylinder that are connected in tandem and operate as one unit, but this cylinder device has a hydraulic cylinder and an air cylinder that are arranged in parallel and that operate as one unit. But that's fine.

As described above, in the present invention, each cylinder device is configured such that the hydraulic cylinder and the air cylinder have working chambers in opposite directions and are integrally connected, so that the hydraulic piping is connected to the hydraulic cylinder. There is only one working chamber, and as a result, the number of hydraulic oil piping for the cylinder device for three-dimensional operation of the feed bar can be halved, which can significantly reduce equipment costs.In addition, the accumulator and air tank reduce the inertia of moving parts such as the feed bar. It absorbs energy and enables smooth material feed operation without shocks or vibrations, and the generated energy can be used effectively by storing and regenerating inertial energy.Furthermore, in the present invention, each cylinder device can be operated arbitrarily and the feed bar can be easily operated. Since it can operate in one dimension, it has many benefits such as trial feeding, mold matching, and quick readjustment to resolve problems.

[Brief explanation of drawings]

FIG. 1 is a plan sectional view of a forging press with a transfer feed device according to the present invention, FIG. 2 is a side sectional view taken along the line in FIG. 1, and FIG. 3 is an explanatory diagram showing a hydraulic pump and its drive system. FIG. 4 is an operating circuit diagram of the cylinder device. 1...Advance cylinder device, 1'...Hydraulic cylinder, 1''...Air cylinder, 2, 2...Feed bar, 3R, 3L...Lift cylinder device, 3R',
3L'...Hydraulic cylinder, 3R'', 3L''...Air cylinder, 4R, 4L...Clamp cylinder device, 4R',
4L'... Hydraulic cylinder, 4R'', 4L''... Air cylinder, 5, 5... Gripping claw, 6... 2-position solenoid valve, 7... 2-position solenoid valve, 8... 2-position solenoid valve, 9...
2-position solenoid valve, 10...2-position solenoid valve, 11...hydraulic pump,
12...Hydraulic pump, 13...Hydraulic pump, 14...Hydraulic pump, 15...Hydraulic pump, 16...Check valve, 17...Pipe line, 8...Low pressure oil supply device, 25...2
Position solenoid valve, 26...2 position solenoid valve, 27...2 position solenoid valve, 28...2 position solenoid valve, 29...2 position solenoid valve, 30...air tank.

Claims (1)

[Claims] 1. A cylinder device that reciprocates the feed bar in its longitudinal direction, a cylinder device that moves the feed bar up and down, and a cylinder device that moves both feed bars toward and away from each other at both ends of a pair of feed bars each having a plurality of gripping claws on opposing sides. These cylinder devices each have a hydraulic cylinder and an air cylinder that have working chambers in opposite directions and are integrally connected. A hydraulic pump, a low-pressure oil supply device, and the operating oil in the operating chamber, which are operated individually by rotary cams corresponding to the cams, are switched so that they flow out to a discharge pipe with a throttle valve.
A position type solenoid valve is directly connected to the piping, and each air cylinder has an air tank that absorbs and accumulates the working gas in each air cylinder and always maintains a predetermined air pressure, and an air tank that discharges the working gas in the air cylinder to a discharge pipe with a throttle valve. A two-position solenoid valve that switches to
The transfer feed device is characterized in that each of the rotating cams is sequentially driven in the order of clamp, lift, advance, down, unclamp, and return with staggered stroke points.