JPH0342132B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intermittent hydraulic drive device for a press or the like. The objectives are (1) to provide an energy-saving press, (2) to provide a press that can perform a large number of operations per unit time, and (3) to provide a reliable combination of slide knock-out and bottom knock-out presses. (4) Providing a press that can be synchronized;
(5) To provide a press with easy slide adjustment;
By providing a press that is sure to prevent overload, and (6) locating the driving hydraulic pressure generator away from the press body, it improves workability around the press body, as well as improves maintainability and safety. (7) To provide a press that allows quick approach, slow forwarding, and quick return.

Conventional mechanical presses have had the following problems.

(a) Since the drive unit is located in the head and the head of the press body is large, presses cannot be placed next to each other;
(2) Since the head rotates a large heavy object, a large foundation is required to prevent vibration; (b) Adjustment of the slide is difficult and would otherwise be complicated.

(c) It is difficult to prevent overload.

Furthermore, conventional hydraulic presses have the following problems.

(a) The main motor has a large capacity; (b) Hydraulic circuit losses are large; (c) Loud noise from the hydraulic unit; There were drawbacks such as...

In order to eliminate such drawbacks of the prior art, the present invention is designed to hydrostatically drive a hydraulic press, forging press, or the like using hydraulic pressure generated by an external device. In this case, the external drive is a type of piston pump, but the crankshaft is intermittently connected to the flywheel by means of a clutch and a brake.

One stroke of this piston pump corresponds to one stroke of the press. The crankshaft is provided with a cam, and by moving a small piston with the cam, the bottom knockout of the press body is hydraulically moved in synchronization with the movement of the press slide.

An example in which the present invention is applied to a hydraulic press will be described below.

FIG. 1 shows an intermittent hydraulic drive device such as a press that is installed separately from the press body.

11 is the piston, and the connecting rod 9 is connected to the pin 10.
is combined with The connecting rod 9 is fitted into the crankshaft 5 at a crank pin 8 located in the middle of the crankshaft 5, and is driven by the rotation of the crankshaft. Further, a clutch hub 4 is fitted to one end of the crankshaft 5, and a clutch disk 1 is attached around the clutch hub 4. A clutch disk 1 is provided between a flywheel 3 rotatably supported by a crankshaft 5 and a clutch cover 2 having a clutch piston, and is used to engage the clutch (actuate the clutch piston and push the clutch disk 1 against the flywheel). The rotation of the constantly rotating flywheel 3 is transmitted to the clutch hub 4 via the clutch disk 1, causing the crankshaft 5 to rotate. Then, the movement of the crank pin 8 causes the piston 11 to move in and out in the left-right direction in FIG. 1 via the connecting rod 9 and pin 10.

When the piston 11 moves left and right, the cylinder 11a
The oil inside is pushed out and enters the lower side (head side) of the piston rod 51 through circuit A in FIG. Then, the slide 52 is lowered.

Further, the oil on the upper side (rod side) of the piston rod 51 is sucked into the rod side of the piston 11 through circuit B as shown in FIG.

When the piston 11 reaches its extension end, the slide 52 of the press reaches its bottom dead center. When the piston 11 returns, oil flows in the circuit A and B in the opposite direction to the above, and the slide 52 of the press rises.
Near the top dead center of the slide 52 of the press, the clutch shown in FIG. 1 is disengaged, the brake 29 is activated, the piston pump is stopped, and the press is also stopped at the same time.

Meanwhile, while the crankshaft 5 is rotating,
The levers 19 and 20 are oscillated by the cams 15 and 16 via the cam rollers 17 and 18 as shown in FIG.
The piston 27 in 26 is reciprocated.

Note that the springs 21 and 22 are connected to the rods 23 and 2.
4 to return to the piston side. and,
The oil in the cylinders 25 and 26 is pushed out and passes through circuits C and D to the slide knockout cylinder 5.
3 (Fig. 4), bottom knockout cylinder 54
Push out the pin (piston rod). The return of the slide knockout cylinder 53 and bottom knockout cylinder 54 is carried out by a pneumatic oil booster 71 (fifth
(Fig.) from circuits E and F.

In addition, 28 is a brake disc (Fig. 1), 5
0 is the press body frame (Fig. 4), 61, 62,
64 is a relief valve, 63 is a shuttle valve, 65,
72 is a solenoid valve for slide adjustment, 67 is a booster pump, 66 is a relief valve, 68 is an air-hydraulic converter, and 69 and 70 are relief valves.

As described above, according to the present invention, hydraulic pressure is generated intermittently using a mechanically continuously driven mechanism, and this hydraulic pressure is used to hydrostatically press a hydraulic press or a forging press from the outside. Since it can be driven, it is possible to obtain a quiet drive device for high-speed hydraulic presses and the like.

In addition, despite the intermittent drive of the conventional hydraulic press, the capacity of the main motor had to be set according to the maximum capacity, and the capacity of the motor had to be increased.However, in the present invention, the inertia of the flywheel By using this, such problems can be eliminated, and the drive device itself can be made smaller and lighter.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a press drive device according to the present invention. FIG. 2 is a sectional view taken along the arrow in FIG. FIG. 3 is a view taken along the arrow in FIG. FIG. 4 is a sectional view of a press slide drive device provided within the press body frame. Figures 5a and 5b are circuit diagrams. In the figure: 1...Clutch disk, 2...Clutch cover, 3...Flywheel, 4...Clutch hub, 5...Crankshaft, 6...Motor, 7
...Belt, 8...Crank pin, 9...Conrod, 10...Pin, 11...Piston, 15...
...Cam, 16...Cam, 17...Cam roller, 1
8...Cam roller, 19...Lever, 20...Lever, 21...Spring, 22...Spring, 23...Rod, 24...Rod, 25...
Cylinder, 26... Cylinder, 27... Piston, 28... Brake disk, 29... Brake, 50... Press body frame, 51... Piston rod, 52... Press slide, 53...
Slide knockout cylinder, 54...Bottom knockout cylinder, 61, 62, 64...Relief valve, 65, 72...Slide adjustment solenoid valve, 66...Relief valve, 67...Booster pump, 68...Empty Hydraulic converter, 69,70
...Relief valve.

Claims (1)

[Claims] 1. A crankshaft is provided that is driven via a flywheel separately from the press body, and the crankshaft is intermittently driven via a clutch and a brake, and a connecting rod is connected to the crank pin of the crankshaft. A piston pump that is driven and a small piston/cylinder that is driven via a cam provided on a crankshaft are provided, and the piston pump and the slide drive cylinder of the press body are connected by a hydraulic circuit, and the small piston/cylinder and A press characterized in that a slide knockout and a bottom knockout cylinder are connected by a hydraulic circuit so that the slide knockout and bottom knockout of the press body are hydraulically operated in synchronization with the movement of the press slide. Intermittent hydraulic drive devices such as.