JPS62168696A - Hydraulic press - Google Patents

Abstract

PURPOSE:To make smooth continuous operation with small prime moving power by combining a flywheel wheel to a pump of a press starting source, changing the tilting angle of a pump to make hydraulic control and absorbing compression energy in the flywheel. CONSTITUTION:The pump 15 is driven by the flywheel 11 energized by a motor 16. A hydraulic circuit 10 is formed as a semiclosed circuit and the tilting angle of the pump 15 is oscillated in opposite directions until a prefill valve 26 is opened to make use of the compression energy to relieve the pressure from the main circuit and to absorb and accumulate the same into the flywheel 11. The energy is released from the flywheel during the molding under pressurization. The working rate is increased and large work energy is taken by the above-mentioned press mechanism.

Description

[Detailed description of the invention] Industrial field of application: The present invention relates to a hydraulic pump that reduces equipment power by double-acting the hydraulic pressure of the supplied pressure oil that serves as the driving source for the cylinder. .

Prior Art: In a hydraulic press, pressurized oil is pumped from an oil pump driven by a motor, mainly a solid rock, and is introduced into a cylinder to exert a pressing force on a ram. Such hydraulic presses are in public use or are described in publications, but one basic example is the 3rd type hydraulic press.
It is recommended to show it in the figure. In other words, a gouge (4) is attached to the column (1), and a main ram (2) with a fixed fixed punch (3) that cooperates with the die (4) to perform the required processing on the workpiece is attached so that it can be raised and lowered. be. The hydraulic system that energizes the main ram (2) consists of a pump (5) that supplies pressurized oil to the main ram (2) and a septa (6) that fully drives the pump, which are connected via piping (9). . (7) is a coupling, and (8) is a tank.

These hydraulic presses require a large-capacity motor (6) that is sufficient to rotate the pump (5) in order to generate the maximum load of hydraulic pressure when operating the main ram (<2). Rarely. Therefore, the motor (6) must be large and have a high rating, and the pump (5) must be large and have a high rating.
) directly receives the driving force of the motor (6), so the control range of capacity, speed, etc. is narrow, and the generated hydraulic pressure is limited to about two stages, or at most several stages.

Problem to be solved by the invention: The present invention has been carried out to solve the problems of the above-mentioned conventional technology, and provides a hydraulic press that can reduce equipment power by equalizing the power consumption and can also achieve a multi-stage pressing state. It is an object.

Configuration and Examples of the Invention: The configuration of the present invention will be described below. In the present invention, the hydraulic circuit included in the hydraulic press is different from the conventional technology. That is, as shown in Fig. 1, in the hydraulic circuit σ1, by combining the flywheel 1) with the pump (to) which is the starting source of the hydraulic press, during one cycle, during pressure molding, the flywheel is not activated. Energy is released from the wheel (b), and construction energy is accumulated during other processes such as when the main ram (2) ascends and returns, and when removing and charging workpieces. In this way, power consumption can be leveled, and the drive motor αQ is also smaller in capacity and smaller than that of the conventional example, making it possible to reduce the equipment power.

Next, one embodiment of the present invention will be described. As shown in Figure 1, a column (1), a main ram (2), a punch (3),
The press mechanism including the die (4) and the like can be the same as in the conventional example. In the hydraulic circuit QO, the pump (to) is driven by a flywheel (1 force) via a clutch @, and this flywheel (b) is given rotational force by a motor tlle via an appropriate transmission part oak. In this case, since rotational energy is stored in the flywheel (b), the rated capacity of the motor (to) can be approximately 1/2 that of the motor (6) used in the conventional example.

One specific example of the hydraulic circuit O0 in these embodiments is shown in the third example.
As shown in the figure. A variable displacement pump is used, which is driven by a flywheel C11)K, which is energized by a relatively small motor. The pressure oil that will be sent out from now on will go through the sequence valve @ to the main ram cylinder? Sent to D.
A portion is sent to the auxiliary cylinder from before the sequence valve (a). The main ram cylinder e◇ is equipped with a prefill valve. On the other hand, a small-capacity, low-pressure auxiliary pump (to) is installed, and a check valve (a) is inserted to pump each auxiliary cylinder (a).
At the same time, it is shunted and fed to the prefill valve ① via the d magnetic valve (a). An accumulator (to) is installed in this branch, but this accumulator (to
) can be omitted from the viewpoint of energy saving and cost.

In general, sequence valves (to), prefill valves, and solenoid valves) have normal functions.
1) uses a surge tank.

Effect of the invention: Pump 4 is of a variable displacement type, and by employing a pusher pump metal, the pump tilting angle is completely changed to control the pressure oil flow f, that is, the ram speed control and the discharge direction. In addition, when filling the low-pressure oil line 11', the low-pressure auxiliary pump @ of car number 1 contributes to opening the prefill valve, assisting in the upward stroke of the ram, and serving as a balancer for maintaining the dead weight of the 9-movement.

Fruit of the invention: The hydraulic press of the present invention having the above-mentioned configuration has a semi-closed hydraulic circuit, and before opening the prefill valve, the pump's tilting angle is oscillated in opposite directions, and the main circuit is depressurized. The compressed energy that is generated is utilized as output through the use of a hydraulic bongo hydraulic motor conversion and is absorbed into the flywheel. Therefore, when a hydraulic pump driven by the drive source of a hydraulic press is combined with a flywheel, energy is released from the flywheel during pressure molding, and energy is stored in the flywheel during other processes. As a result, continuous operation can be performed smoothly with a small motive force, and in addition to energy saving, the machining speed can be increased, and a large amount of work energy can be taken, resulting in great industrial applicability.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention, FIG. 2 is a hydraulic circuit diagram applied to the embodiment of FIG. 1, and FIG. 3 is a diagram showing a conventional example.

Claims (1)

[Claims] In a hydraulic press having a hydraulic circuit including a pump driven by a motor; It has a structure in which a flywheel is interposed between the pump and the motor, and the flow rate of pressure oil is controlled by changing the pump tilt angle, and the pump acts as a hydraulic motor by changing the pump tilt angle in the opposite direction. This hydraulic press is characterized by a configuration in which the flywheel absorbs and stores the compression energy for depressurizing the main circuit, produces the required work energy with a small motive force, and is capable of high-speed operation.