KR200141081Y1 - Hydraulic control circuit for oil-hydraulic actuators - Google Patents

Abstract

The present invention relates to a hydraulic control circuit of a hydraulic actuator of a novel configuration, the hydraulic control circuit having a main control valve for controlling the hydraulic oil supplied by the hydraulic pump to operate the hydraulic actuator, the hydraulic actuator and the main control Between the valve is connected to the first hydraulic valve and the juice valve is installed in the first hydraulic circuit between the main control valve and the operating rod side, and the juice pool is connected to the second hydraulic circuit of the main control valve and the piston side A main control means having a first check valve for joining the pressure oil discharged from the actuating rod side to the piston side, the second logic valve being connected to a control spool in the first hydraulic circuit; It is connected in parallel to the first and second hydraulic circuit in the section between the main control valve and the first and second logic valve to return the pressure oil discharged from the control spool of the first logic valve to the main control valve. A relief valve having a pair of second check valves and a third check valve connected to the second hydraulic circuit and opened in excess of an appropriate pressure in the second hydraulic circuit to be connected in parallel so that the working rod is advanced at a constant speed; The juice pool is connected between the second check valve and the first logic valve, and the control spool is connected to the relief valve and the second hydraulic line, and is an auxiliary control means comprising a switching valve for selectively changing the supply direction of the hydraulic oil. The hydraulic control means configured to provide a predetermined amount of pressure oil discharged to the hydraulic rod side hydraulic line during operation of the hydraulic actuator By joining the piston-side hydraulic line by the control means to improve the initial forward operation speed of the hydraulic actuator with limited power, it is possible to improve the working efficiency of various devices using the hydraulic actuator.

Description

Hydraulic Control Circuit of Hydraulic Actuator

The present invention relates to a hydraulic actuator, and in particular, the hydraulic oil discharged to the hydraulic rod side hydraulic line during operation of the hydraulic actuator is re-supplied to the piston side hydraulic line by a predetermined control means to join the hydraulic actuator with the initial advance of the hydraulic actuator with limited power. The present invention relates to a hydraulic control circuit of a hydraulic actuator which improves the working efficiency of various devices using the hydraulic actuator by improving the operating speed.

In general, the hydraulic device converts the mechanical energy from the prime mover into the pressure energy of the fluid by the hydraulic pump and performs three basic control of the fluid energy such as pressure, flow rate, and direction by using various valves. A series of devices that change mechanical energy again using an oil hydraulic actuator (hereinafter referred to as an actuator).

Therefore, such a hydraulic device must be provided with a hydraulic circuit for controlling the fluid, as well as the output efficiency and the operating speed of the actuator significantly depends on the configuration of the hydraulic circuit is an important hydraulic circuit design is an important issue. It is handled.

Fig. 1 shows a basic hydraulic circuit provided in the actuator 1 in such a hydraulic apparatus, which is operated by the hydraulic pump 3 driven by the driving apparatus 2, and the supplied hydraulic oil is supplied to the main control valve 4. By selectively supplying to the operating line 5 side line and the piston 6 side line under the control of), the operating rod 5 of the actuator 1 is repeatedly performed to move forward and backward.

However, the conventional actuator 1 is limited in output efficiency and operation speed by the capacity of the hydraulic pump 3, so that the operating rod 5 of the actuator 1 performs constant speed operation, and thus the performance of various devices using the same. Since limited by the capacity of the hydraulic pump there was a problem that the work efficiency is relatively low.

Therefore, in order to speed up the operation of hydraulic actuators that require high power, hydraulic pumps of larger capacity should be used. In addition, there is no other means to solve this problem because there is no inefficient method of using a larger sized piping line. A device is required.

The present invention has been made to solve the above-mentioned problems, the object of the present invention is to supply the hydraulic oil discharged to the hydraulic rod side hydraulic line to the piston side hydraulic line by a predetermined control means during the operation of the hydraulic actuator It is to provide a hydraulic control circuit of a hydraulic actuator that improves the working efficiency of various devices using the hydraulic actuator by improving the initial forward operation speed of the hydraulic actuator with a limited power to join.

The present invention for achieving the object of the present invention in the hydraulic control circuit having a main control valve for operating the hydraulic actuator by controlling the pressure oil supplied by the hydraulic pump, between the hydraulic actuator and the main control valve Main control means connected between the main control valve and the hydraulic actuator to selectively supply pressure oil supplied by the control to the main control valve to the operating rod side and the piston side of the hydraulic actuator; Is connected between the main control means and the hydraulic actuator is provided with a hydraulic control means consisting of auxiliary control means for feeding back the pressure oil discharged from the working rod side to the piston side to increase the initial forward speed of the working rod It is characterized by.

The main control means has a first logic valve which is connected to the first hydraulic circuit between the main control valve and the operating rod side of the juice pool, and the juice pool is connected to the second hydraulic circuit of the main control valve and the piston side is installed It has a first check valve for joining the pressure oil discharged from the working rod side to the piston side, and consists of a second logic valve that is connected to the control spool to the first hydraulic circuit.

The auxiliary control means is connected to the first and second hydraulic circuit in parallel in the section between the main control valve and the first and second logic valve to discharge the pressure oil discharged from the control spool of the first logic valve to the main control A pair of second check valves for returning to the valve, and a third check valve connected to the second hydraulic circuit and opened when the proper pressure in the second hydraulic circuit is exceeded, and connected in parallel so that the working rod is advanced at a constant speed. A juice valve is connected between the relief valve and the second check valve and the first logic valve, and a control spool is connected to the relief valve and the second hydraulic line to selectively change the supply direction of the hydraulic oil. It is composed.

1 is a hydraulic circuit diagram showing an example of a conventional hydraulic device,

2 is a configuration of a hydraulic apparatus to which a double speed hydraulic control circuit of the present invention is applied.

Hydraulic circuit diagram,

3 to 5 are hydraulic circuit diagrams showing an operating state of the present invention.

※ Explanation of symbols used in main part of drawing ※

11: hydraulic actuator, 12: drive,

13: hydraulic motor, 14: main control valve,

15: working rod, 16: piston,

17: the first hydraulic line, 18: the second hydraulic line,

20: third hydraulic circuit, 21: fourth hydraulic circuit,

22: fifth hydraulic circuit, 23: sixth hydraulic circuit,

30: Main control means, 31, 34: Main spool,

32, 35: control spool, 33: first logic valve,

36: second logic valve, 37: first check valve,

40: auxiliary control means, 41: relief valve,

42: switching valve, 43: third check valve,

50: hydraulic control means, 51, 52: second check valve

When described in detail with reference to the accompanying drawings, the contents of the present invention as an embodiment.

Figure 2 is a perspective view for showing the configuration of the present invention, when described with reference to the basic hydraulic control circuit of the hydraulic actuator 11 is a hydraulic pump 13 driven by the drive device 12 to supply the fluid at a predetermined pressure And a main control valve 14 connected to the first hydraulic circuit 17 and the second hydraulic circuit 18 to control the pressure oil to operate the actuator 11.

Therefore, in the hydraulic control circuit of the present invention, the initial forward operation of the operating rod 15 of the actuator 11 reciprocating forward and backward in order to perform a predetermined operation is performed quickly to improve the overall performance of the actuator 11. Between the actuator 11 and the main control valve 14, the hydraulic oil discharged to the first hydraulic circuit 17 on the operating rod 15 side when the actuator 11 is operated, the second hydraulic circuit (the piston 16 side) 18) the hydraulic control means 50 for joining is provided.

The hydraulic control means 50 is composed of the main control means 30 and the auxiliary control means 40, the main control means 30 is installed between the main control valve 14 and the actuator 11 to the main control valve ( 14 serves to selectively supply the pressurized oil supplied by the control of 14 to the actuating rod 15 side and the piston 16 side of the actuator 11, and the auxiliary control means 40 includes the main control means 30 and the actuator. It is connected between the (11) and feeds back the pressure oil discharged from the operating rod 15 side to the piston (16) side to increase the pressure of the hydraulic pressure momentarily increases the initial forward speed of the operating rod (16) It is configured to be.

Referring to the specific configuration of the main control means 30 and the auxiliary control means 40 according to this basic principle as follows.

First, the main control means 30 is provided with a first logic valve 33 to which the main spool 31 is connected to the first hydraulic circuit 17 between the main control valve 14 and the operation rod 15 side. The main spool 34 is connected to the second hydraulic circuit 18 on the main control valve 14 and the piston 16 so as to operate in conjunction with the first logic valve 33. It has a first check valve 37 for allowing the discharged pressure oil to be re-supplied to the piston 16 to join, the control spool 35 is connected to the first hydraulic circuit 17 to the seventh hydraulic circuit 24 The second logic valve 36 is formed.

The first check valve 37 described above is provided in the third hydraulic circuit 20 connected to the main spool 34 and the second hydraulic circuit 18 of the second logic valve 36.

In addition, the first logic valve 33 and the second logic valve 36 are supplied with the hydraulic oil supplied by the control of the main control valve 14 through the first hydraulic circuit 17 or the second hydraulic circuit 18. Depending on the situation, the high pressure side is closed and the low pressure side is configured to have a valve structure that can be opened.

That is, as shown in FIG. 3, in the state of retracting the operation rod 15 in the drawn state, the second logic valve 33 is closed under high pressure and the first logic valve 36 is closed under low pressure. It must be open as a state.

In addition, in the state in which the operating rod 15 is initially operated quickly, as shown in FIG. 4, the first logic valve 33 must maintain the high pressure as it is from the operating rod 15 to the first hydraulic circuit 17. The discharged pressure oil may be joined to the second hydraulic circuit 18 via the main spool 34 of the second logic valve 36.

On the other hand, the auxiliary control means 40 is parallel to the first and second hydraulic circuits 17 and 18 in the section between the main control valve 14, the first logic valve 33 and the second logic valve 36. A pair of second check valves 51 and 52 are installed in the fourth hydraulic circuit 21 to be connected to return the hydraulic oil discharged to the control spool 32 of the first logic valve 33 to the main control valve 14. Be sure to

In addition, the relief valve 41 is connected to the second hydraulic circuit 18 so that the third check valve 43 is connected to both ends thereof so that the operating rod 15 of the actuator 11 is moved forward at a constant speed by opening when the proper pressure of the hydraulic oil is exceeded. And a switching valve 42 connected between the second check valves 51 and 52 and the first logic valve 33 to selectively change the supply direction of the hydraulic oil.

The switching valve 42 is connected to the second check valves 51 and 52 and the first logic valve 33 by the fifth hydraulic circuit 22, and the relief valve 41 and the second hydraulic line 18 and the Six hydraulic circuits 23 are connected.

If described in detail the operating state of the hydraulic control circuit of the present invention hydraulic actuator configured as described above.

3 shows the reverse operation state of the actuator 11 operating rod 15 in the drawn state, in which pressure oil is supplied from the hydraulic pump 13 to control the main control valve 14 to control the first hydraulic circuit 17. And are supplied to the first and second logic valves 33 and 36.

At this time, since the first spool valve 33 is in a low pressure state under the conditions described above, the main spool 31 is open, and the second logic valve 36 is in a closed state as a high pressure state. The hydraulic oil supplied via the 24 is not in a state of flowing and is supplied to the operation rod 15 side of the actuator 11 through the first logic valve 33 to operate the operation rod 15 backward.

Next, the reverse operation is completed, the operation rod 15 is moved forward again to perform a predetermined operation, where the operation of the operation rod 15 is operated to move quickly until a direct operation is made of the entire moving distance.

That is, the first logic valve 33 is in a closed state as a high pressure state in the reverse of the above-described conditions, and the main spool 34 of the second logic valve 36 is in an open state.

4 shows an initial forward operation state of the operating rod 15. When the hydraulic oil is supplied at a high pressure to the second hydraulic circuit 18 under the control of the main control valve 14, the hydraulic oil causes the switching valve 42 to operate. It is also transmitted to the first logic valve 33, but since it is in a closed state, the hydraulic oil is not supplied to the first hydraulic line 17. Accordingly, most of the hydraulic oil is supplied to the piston 16 side of the actuator 11 to operate the rod ( 15) will move forward.

At the same time, the pressurized oil on the operating rod 15 side of the actuator 11 is discharged to the first hydraulic line 17, which is the main spool 34 of the second logic valve 36 through the first hydraulic line 17. The pressure of the returned hydraulic oil is added to the pressure of the hydraulic oil supplied by the hydraulic pump 13 by being supplied back to the second hydraulic circuit 18 through the first check valve 37 and joined to the piston 16. As the pressure is doubled, the piston 16 eventually moves forward at a high speed so that the actuating rod 15 quickly moves to the working position.

5 shows the constant speed operation state after the initial forward operation of the actuating rod 15. When the pressure in the second hydraulic circuit 18 becomes equal to or higher than the proper pressure of the relief valve 41, the relief valve 41 is opened. At the same time, as the first logic valve 33 becomes low, the pressure oil discharged to the operating rod 15 is supplied to the switching valve 42 through the fifth hydraulic circuit 22 via the control spool 32. The supply path of the valve 42 is changed by the opening operation of the relief valve 41 so that the hydraulic oil passing through the first logic valve 33 is returned to the main control valve 14 through the second check valve 51. The oil will flow under normal pressure.

Therefore, the operating rod 15 is moved quickly, and then slowly moves forward at a constant speed from the operation point to the work position to perform a predetermined task.

As described above, according to the hydraulic control circuit of the hydraulic actuator of the present invention, the hydraulic oil discharged to the hydraulic rod side hydraulic line during operation of the hydraulic actuator is supplied again to the piston side hydraulic line by a predetermined control means to join the limited hydraulic power. By improving the initial forward operation speed of the hydraulic actuator to improve the working efficiency of various devices using the hydraulic actuator, the present invention is a useful design with many advantages.

Claims (3)

In the hydraulic control circuit having a main control valve for controlling the hydraulic oil supplied by the hydraulic pump to operate the hydraulic actuator, Main control means connected between the main control valve and the hydraulic actuator between the hydraulic actuator and the main control valve to selectively supply pressure oil supplied by the control to the main control valve to the operating rod side and the piston side of the hydraulic actuator. and; Is connected between the main control means and the hydraulic actuator is provided with a hydraulic control means consisting of auxiliary control means for feeding back the pressure oil discharged from the working rod side to the piston side to increase the initial forward speed of the working rod Hydraulic control circuit of a hydraulic actuator, characterized in that. According to claim 1, wherein the main control means and the first logic valve is connected to the juice pool is installed in the first hydraulic circuit between the main control valve and the operating rod side, A juice pool is connected to the main control valve and the second hydraulic circuit on the piston side, and has a first check valve for joining the pressure oil discharged from the working rod side to the piston side, and a control spool on the first hydraulic circuit. The hydraulic control circuit of the hydraulic actuator, characterized in that composed of the second logic valve is installed. According to claim 1, wherein the auxiliary control means is connected in parallel to the first and second hydraulic circuit in the interval between the main control valve and the first and second logic valve discharged from the control spool of the first logic valve A pair of second check valves for returning the pressurized oil to the main control valve; A relief valve having a third check valve connected to the second hydraulic circuit and opened in excess of an appropriate pressure in the second hydraulic circuit to be connected in parallel so that the working rod is advanced at a constant speed; Juice pool is connected between the second check valve and the first logic valve and the control spool is connected to the relief valve and the second hydraulic line is composed of a switching valve for selectively changing the supply direction of the hydraulic oil Hydraulic control circuit of hydraulic actuator.