JPS5813201A - Hydarulic apparatus for press - Google Patents

Abstract

PURPOSE:To decrease the disgorging amount from a hydraulic pump and reduce the driving force of the pump at the time when a press is operated without a load by a muthod wherein a pilot pump with a small disgorging amount is connected with a regulator in the feeding circuit of an actuator of hydraulic pressure for the press. CONSTITUTION:As a hydraulic pump 2 of variable capacity type is operated without a load in such a time as a press is stopped, an opening and closing valve 15 of pilot pump 4 located at a position 15a is operated toward a position 15b and the pressed oil is introduced into a pilot piston 9, and the piston 9 make a switch valve 8 connect between the chamber 6a, 6b. By this force a piston 6 produces thrust toward the left, so that the disgorging amount of the pump 2 is decreased at nearly 30% of the maximum disgorging amount to reduce the driving amount of the pump 2.

Description

[Detailed description of the invention] The present invention Concerning hydraulic equipment used for.

As shown in the first diagram, the conventional type hydraulic system consists of two OIl constant volume pumps, a high pressure pump a and a low pressure pump b! In this case, when the hydraulic pressure supply circuit 00 pressure to the hydraulic cylinder or other actuator is relatively low pressure, both pumps 1.
When the supply circuit is supplied from 1 and the pressure increases due to the actuator depression operation, the low pressure pump is turned off (w-)'
Generally, high-pressure pump 1 is supplied to circuit No. 1, and both pumps a and b continue to discharge even during no-load operation, resulting in relatively large amounts of noise and power loss - an inconvenience. In addition, it is necessary to provide a large-diameter safety valve d for the unrade of the low-pressure pump b, which has the disadvantage of increasing manufacturing costs.

The purpose of this project #4 is to eliminate problems such as the Hirokoushi Kufubukai, etc., and a hydraulic regulator is used in the hydraulic pressure supply circuit to hydraulic cylinders and other press actuators.
9 variable capacity IIIk, v hydraulic pump t-* continuation L1 wrinkle regulator is operated to forcibly reduce the discharge volume of @hydraulic pump due to constant mismatch. Consists of connections.

To explain one example of the device of the present invention with reference to the drawings, (1) is a hydraulic cylinder and other press actuators.
(Hydraulic supply line that supplies pressure oil to multiple units, (2) is a hydraulic regulator (37K)) Constant horse power K11llll
9 variable displacement hydraulic pump 1 (4J is ati'-W regulator (3) and armpit hydraulic pump (2J OIt ffl 1
1 - Constraint #R/J
i (3) is connected to the swash plate of the variable displacement hydraulic pump (2) and other mechanisms for varying the pump capacity (KLL-RAD 5), and the screw (6) and the red (5). K
It is provided with a nine-switching valve (8) brought into contact via a spring (7), and a piston screw (9) that moves the switching valve (8) against a spring (7). Then, the pressure of the hydraulic pressure supply circuit (1) is supplied to the biscine (6) through the circuit all.
11 (6- to 6- and orifice at
The switching valve (8) is actuated by moving the switching valve (8) against the spring (71) through the 9tm Mas.
According to the movement of K to one side, one O-rich (4&) of the biscine (6) to the other O-chamber (4k), the K connected cell position (
8K) and KL9 to provide a position (8b) that communicates the other chamber (6b) with the tank according to the movement to the other side.

Nine safety valves 1a controlled by as#is inert valve a4
$ is the discharge circuit aliK intervening on-off valve of the press pump (4). To explain its operation, the load on the actuator at the beginning of press operation is small, and the hydraulic pressure supply WAll (1) is supplied with a variable displacement hydraulic pump. (2) supplies low-pressure oil to the circuit (1), and 0 pressure passes through circuit a4I to the piston (6).
flows into one 1ii (6a) and the other II
C61) is connected to the tank, so wrinkles (6)
The O button on the right side of the plane moves in the direction of increasing the discharge amount of the pump (2), and the supply circuit (3) moves through the armpit screw (6) and connects the CfIL through the hot water. The rightward movement of the switching valve (8) is falsified by the pressure oil of II, and when the left and right bolts (4a) (4b) of the wrinkle screw (6) communicate with each other, the piston A thrust to the left is generated due to the difference between the pressure receiving surface and the O, but this thrust is balanced with the O pressure in the circuit (I), and the screws (6) stop moving, and the pump 12
) discharges a large amount depending on the moving position of the biscine (6). Subsequently, as the load on the actuator increases as the press operation progresses and the pressure in the supply circuit (1) increases, the piston (6) increases the thrust L? The variable displacement pump (2) moves to the left to rarely reduce the discharge amount of L% scissors - force and the pressure of one path (13) are balanced and stops at the 9th position.As mentioned above, the variable displacement pump (2) is connected to the supply circuit. The discharge amount is automatically controlled according to the press load pressure in (1), and the horsepower of the pump (2) is controlled to be constant, but when the pump (2) is under no load as when the press is stopped. When it came to operation, it was located at the company's location (1
5a) K Atsui Piput Pump (4) all l!
Valve a11 position (15b) Made by KII L”Cha4 vx
y) Hyx) :/ This is the device that introduces pressure oil into (9) and forces the piston (9) to communicate with the switching valve (8) between the dm and (4k) ports. Piston (6)
generates a leftward thrust, and the pump t2j OIt, as amount is reduced to about 50% of the maximum discharge amount, and as seen in the curve shown in Figure S (pump (2) O driving power can be reduced). .

In this way, according to the present invention, an optically variable displacement hydraulic pump is connected to the hydraulic pressure supply circuit of the press actuator, and the power is controlled at a constant level by the AFZ regulator, and a small discharge volume hydraulic pump is connected to the regulator. By connecting the hydraulic pump and forcing the discharge volume of the hydraulic pump to be reduced, the discharge volume of the hydraulic pump, which tends to increase during no-load operation of the press equipment, can be reduced and the pump driving power can be reduced. In addition to being able to reduce the amount of water discharged during no-load conditions, there are other effects such as a reduction in the discharge amount during no-load, and the ability to use a smaller diameter and cheaper unseed valve.

[Brief explanation of drawings]

Figure j11 is the 0m diagram of the conventional device! 1211 is the 7th invention device 01 example o is m s m s diagram is 70S + control curve g
(1)...Hydraulic supply enclosure (2)...Variable capacity hydraulic pump (3J-...Hydraulic regulator)
(4)・・・Pie Stomach) Dump 16)・・・・・・
・・・Bisshin (6 荀(4b)・吻・琴(8)・・
・・・・・・−IJ exchange valve (9)・・・Pi prize switching system I・・・・・・Circuit aυ・・
・・・・・・2 people outside the orifice

Claims (1)

[Scope of Claims] L: A hydraulic redayulator is connected to a hydraulic pressure supply circuit for hydraulic cylinders and other press actuators, and a variable, displacement type hydraulic spring whose power is controlled at a constant rate is connected to the scissor hydraulic pressure l to the hook ginulator. The pump should be operated to reduce the discharge amount of *S+ (small discharge amount pipe).
Hydraulic system for a press consisting of a series of presses. Tortoise: The Ray crystallizer is connected to a swash plate or other capacity variation mechanism (j! connected to a large piston) of the variable displacement hydraulic pump;
Transfer the 9 switching valves connected to the screws and the 1IIFJ switching valves 1
A bi-sealed piston with a pressure of 6'J is provided, and the pressure of the hydraulic pressure supply circuit is supplied to the piston. A circuit for acting on one chamber and a path for moving it to the switching valve via an oriice are provided, and by moving the one chamber to -1 of the switching valve, the other side of the skeleton piston is provided. It is connected to the room of 1@@
When the switching valve is moved to the other side, the other side is configured to communicate with the tank, and the discharge pressure of the switching valve is applied to the piston, and the switching valve is operated in the other direction. Claims consisting of making or breaking ■No. 1
Item 11 Hydraulic device for press 0