KR960010220Y1 - Hydraulic circuit having pressure loss protective function by direction control valve - Google Patents

Hydraulic circuit having pressure loss protective function by direction control valve Download PDF

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Publication number
KR960010220Y1
KR960010220Y1 KR2019930023178U KR930023178U KR960010220Y1 KR 960010220 Y1 KR960010220 Y1 KR 960010220Y1 KR 2019930023178 U KR2019930023178 U KR 2019930023178U KR 930023178 U KR930023178 U KR 930023178U KR 960010220 Y1 KR960010220 Y1 KR 960010220Y1
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South Korea
Prior art keywords
control
valve
spool
control valve
variable orifice
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KR2019930023178U
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Korean (ko)
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KR950014685U (en
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이종원
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대우중공업 주식회사
석진철
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/028—Shuttle valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means

Abstract

내용 없음.No content.

Description

방향제어 밸브를 이용한 압력손실 방지 유압회로Pressure Loss Prevention Hydraulic Circuit Using Directional Valve

제1도는 종래 기술에 따른 유압장치의 계통을 나타내는 개략도.1 is a schematic diagram showing a system of a hydraulic apparatus according to the prior art.

제2도는 본 고안에 따른 유압장치의 계통을 나타내는 개략도.2 is a schematic view showing a system of a hydraulic device according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 제1펌프 2 : 제2펌프1: 1st pump 2: 2nd pump

3 : 제1제어스풀 4 : 제2제어스풀3: first control spool 4: second control spool

5 : 가변오리피스밸브 6 : 방향제어밸브5: Variable Orifice Valve 6: Directional Control Valve

7 : 전자비례밸브 8 : 제1조절밸브7: electromagnetic proportional valve 8: first control valve

9 : 제2조절밸브 10 : 셔틀밸브9: second control valve 10: shuttle valve

11 : 제1작동기 12 : 제2작동기11: first actuator 12: second actuator

13 : 탱크 21 : 바이패스라인13 tank 21: bypass line

본 고안은 유압구동장치의 제어밸브에 관한 것이며, 특히 2이상의 조절밸브가 마련되어 2 이상의 작업을 동시에 수행할 수 있도록 하는 복합조작식 유압장치에 있어서 압력손실을 방지하기 위한 장치에 관한 것이다.The present invention relates to a control valve of a hydraulic drive device, and more particularly, to a device for preventing pressure loss in a multi-acting hydraulic device that is provided with two or more control valves to perform two or more operations at the same time.

일반적으로 유압장치는 조절밸브에 의해 제어되어 여러종류의 작업을 하게 되며, 복합동작이 필요할 경우에는 유압장치의 작동에 동시에 관여할 수 있는 2 이상의 조절밸브를 마련하여 2이상의 작동기를 구동시켜 전체 유압장치의 작동상태가 복합동작이 되도록 한다. 상기 조절밸브에 의해 제어되는 유압은 통상제어스풀을 통과하여 작동기를 구동시키게 된다. 이와 같은 통상의 형태의 유압구동장치에 있어서 복합동작을 발생시키기 위하여 조절밸브를 2 이상 마련하게 되면 각각의 작동기에 인가되는 유압의 불균형 현상이 발생되어 조절밸브만에 의하여 작동기들을 원하는 상태로 구동시킬 수가 없게 되어, 필요한 복합구동효과를 나타내지 못하는 경우가 발생된다.In general, the hydraulic system is controlled by a control valve to perform various types of work.When a complex operation is required, two or more control valves are provided to operate the hydraulic system at the same time to drive two or more actuators to operate the entire hydraulic system. Allow the device to operate in a mixed motion. The hydraulic pressure controlled by the regulating valve is usually passed through the control spool to drive the actuator. In such a conventional type of hydraulic drive device, when two or more control valves are provided to generate a complex operation, an imbalance of hydraulic pressure applied to each actuator is generated, and the actuators are driven to a desired state only by the control valve. There are cases where there is no number, and the necessary compound driving effect is not exhibited.

본 고안은 이러한 문제점을 해결하기 위하여 안출된 것으로서, 본 고안에서는 조절밸브들 중의 하나에 셔틀밸브를 마련하여 하나의 조절밸브의 단독조작 시에는 그 유압이 타 조절밸브에 전달되지 않게 하고 다른 하나의 조절밸브의 작동시, 또는 복합작동시에는 하나의 조절밸브의 유압이 가변오리피스밸브를 통하여 타 조절밸브로 전달되도록 함으로써 상기와 같은 목적을 달성하도록 한 것으로서, 이하 첨부도면을 참조로 하여 본 고안을 설명하면 다음과 같다.The present invention has been made to solve this problem, in the present invention by providing a shuttle valve in one of the control valves so that the hydraulic pressure is not transmitted to the other control valve when operating one control valve alone At the time of operation of the control valve or combined operation, the hydraulic pressure of one control valve is transferred to the other control valve through the variable orifice valve to achieve the above object, the present invention with reference to the accompanying drawings. The explanation is as follows.

제1도는 종래 기술에 따른 유압장치의 유압회로도로서, 탱크(20)에 저장되어 있는 유압유는 제1펌프(1)에 의해 송출되어 각각의 부품에 공급된다. 도면에 도시된 유압회로에서는 제1제어스풀(3) 및 제2제어스풀(4)이 각각 마련되고, 상기 제1제어스풀(3)에 의해 구동되는 제1작동기(11) 및 제2제어스풀(4)에 의해 구동되는 제2작동기(12)도 역시 마련된다.1 is a hydraulic circuit diagram of a hydraulic apparatus according to the prior art, wherein the hydraulic oil stored in the tank 20 is sent out by the first pump 1 and supplied to each component. In the hydraulic circuit shown in the drawing, the first control spool 3 and the second control spool 4 are provided, respectively, and the first actuator 11 and the second control spool driven by the first control spool 3. A second actuator 12 driven by 4 is also provided.

상기 제1작동기(11) 및 제2작동기(12)의 작동은 제1조절밸브(8) 및 제2조절밸브(9)에 의해 제어된다. 즉, 제1조절밸브(8)의 라인(b1) 및 (b2)는 각각 제1제어스풀(3)의 라인(b1) 및 (b2)에 각각 연결되어, 제1조절밸브(8)의 작동에 의해 제1제어스풀(3)에 유압을 공급하거나 또는 배출시키는 역할을 하게 된다. 상기 제2제어스풀(4)은 마찬가지로 제2조절밸브(9)에 의해 작동이 조절되는데, 상기 제2조절밸브(9)의 라인(a1)는 제2제어스풀(4)의 라인(a1)에 연결되고, 라인(a2)는 제2제어스풀(4)의 라인(a2)에 연결된다. 상기 제1제어스풀(3) 및 제2제어스풀(4)의 작동의 상세한 상태는 본 고안의 요지와는 관계가 없고 당해 기술에 통상의 지식을 갖는 자에게는 용이하게 이해될 수 있는 것이므로 이에 대한 상세한 설명은 생략한다.The operation of the first actuator 11 and the second actuator 12 is controlled by the first regulating valve 8 and the second regulating valve 9. That is, the line of the first control valve (8) (b 1) and (b 2) are respectively connected to the line (b 1) and (b 2) of the first control spool 3, respectively, the first control valve ( Operation of 8) serves to supply or discharge hydraulic pressure to the first control spool (3). The second control spool 4 is likewise regulated in operation by a second control valve 9, the line a 1 of the second control valve 9 being the line a of the second control spool 4. coupled to 1), line (a 2) is connected to the line (a 2) of the second control spool 4. The detailed state of the operation of the first control spool 3 and the second control spool 4 is irrelevant to the gist of the present invention and can be easily understood by those skilled in the art. Detailed description will be omitted.

이제 제1조절밸브(8)을 작동시켜 제1제어스풀(3)에 유압을 공급하게 되면 제1작동기(11)가 작동하게 된다. 이때에 제2제어스풀(4)에 유압이 인가되지 않을 경우에는 가변오리피스밸브(5)를 통하여 제2제어스풀(4)로 압유가 흐르지 않으므로 압력손실은 발생되지 않는다.Now, when the first control valve 8 is operated to supply hydraulic pressure to the first control spool 3, the first actuator 11 is operated. At this time, when the hydraulic pressure is not applied to the second control spool 4, the pressure loss does not occur because the hydraulic oil does not flow to the second control spool 4 through the variable orifice valve (5).

이제 제1제어스풀(3)과 제2제어스풀(4)을 동시에 작동시키기 위하여 제1조절밸브(8) 및 제2조절밸브(9)를 동시에 조절할 때, 만일 제1작동기(11)의 압력이 낮고 제2작동기(12)의 압력이 높은 경우에는 상기한 바와 같이 유압의 일부가 제2제어스풀(4)로부터 제1제어스풀(3)로 전달되어 작동기 사이의 속도 불균형이 발생하게 되는데, 이러한 현상은 제1조절밸브(8) 및 제2조절밸브(9)만의 작동에 의하여는 제어하기 어려운 경우가 발생되어, 결국 필요로하는 복합동작상태를 달성할 수 없는 결과가 된다.Now when simultaneously adjusting the first regulating valve 8 and the second regulating valve 9 to actuate the first control spool 3 and the second control spool 4 simultaneously, the pressure of the first actuator 11 is reduced. When the pressure is low and the second actuator 12 is high, a portion of the hydraulic pressure is transferred from the second control spool 4 to the first control spool 3 as described above, causing a speed imbalance between the actuators. This phenomenon is difficult to control due to the operation of only the first control valve 8 and the second control valve 9, which results in the result that the required combined operation state cannot be achieved.

이러한 단점을 해결하기 위하여 종래 기술에서는 제1도에 도시된 바와 같이 전자비례밸브(7)를 가변오리피스밸브(5)에 연결하여 오리피스의 개구면적을 조절 하도록 하는 시도가 행하여 졌다. 그러나, 제2제어스풀(4)에 유압이 공급되고 제1제어스풀(3)에 유압이 인가되지 않을 경우에는 가변오리피스밸브(5)를 통하여 발생되는 압력손실은 에너지의 낭비가 되는 것이다.In order to solve this disadvantage, the prior art attempts to adjust the opening area of the orifice by connecting the electromagnetic proportional valve (7) to the variable orifice valve (5) as shown in FIG. However, when the hydraulic pressure is supplied to the second control spool 4 and the hydraulic pressure is not applied to the first control spool 3, the pressure loss generated through the variable orifice valve 5 is a waste of energy.

이와 같이 제2제어스풀(4)의 단독조작시에는 불필요하고 복합동작시에는 필요한 가변오리피스밸브(5)를 필요에 따라 개폐시키기 위하여 본 고안이 필요하다.In this way, the present invention is necessary to open and close the variable orifice valve 5, which is unnecessary for the single operation of the second control spool 4 and necessary for the complex operation.

제2도는 본 고안에 따른 유압회로도를 나타낸 도면으로서, 제2도에서는 제1도와 동일한 부품에 대하여는 동일한 참조번호를 부가하였다. 도면에서 볼 수 있는 바와 같이, 본 고안에서는 제1제어밸브(8)와 가변오리피스 밸브(5) 사이에 셔틀밸브(10)을 설치한다. 상기 셔틀밸브(10)은 라인(b)과 (b)사이에 위치하여 가변오리피스 밸브(5)와 연결되어 있는 방향제어밸브(6)와 연결된다. 상기 방향제어밸브(6)의 일단은 전자비례밸브(7)에 연결된다. 상기 방향제어밸브(6)에는 바이패스라인(21)이 마련되어 탱크(20)로 향하는 라인과 연통되어 있다.FIG. 2 is a view showing a hydraulic circuit diagram according to the present invention. In FIG. 2, the same reference numerals are given to the same parts as those of FIG. As can be seen in the figure, in the present invention, a shuttle valve 10 is installed between the first control valve 8 and the variable orifice valve 5. The shuttle valve 10 is connected between the direction control valve 6 which is located between the lines (b) and (b) is connected to the variable orifice valve (5). One end of the directional control valve 6 is connected to the electromagnetic proportional valve (7). The directional control valve 6 is provided with a bypass line 21 in communication with the line directed to the tank 20.

상기의 구성을 갖는 본 고안의 작용을 설명하면 다음과 같다.Referring to the operation of the present invention having the above configuration is as follows.

제1제어밸브(8)를 작동시켜 제1작동기(11)를 단독으로 작동시키거나 또는 제2작동기(12)와 복합으로 작동시키는 경우에만 가변오리피스밸브(5)가 작동되어 제1제어스풀(3)과 제2제어스풀(4) 사이의 압력차이를 상호 조절하여 제1작동기(11)과 제2작동기(12)사이의 상호 속도를 조절할 수 있게 된다. 물론 가변오리피스밸브(5)의 개구도는 전자비례밸브(7)에 의해 조절되며, 이 경우 방향제어밸브(6)는 가변오리피스밸브(5)와 전자비례밸브(7)사이의 연통상태를 이루게 된다. 상기 방향제어밸브(6)는 가변오리피스밸브(5)와 전자비례밸브(7)사이의 연통상태를 이루는 것은 셔틀밸브(10)로부터의 유압에 의해 방향제어밸브(6)의 스프링이 밀리면서 스프링측의 오일이 바이패스라인(21)을 통하여 탱크(20)으로 귀환되기 때문이다.The variable orifice valve 5 is operated only when the first control valve 8 is operated to operate the first actuator 11 alone or in combination with the second actuator 12 to operate the first control spool ( It is possible to control the mutual speed between the first actuator 11 and the second actuator 12 by mutually adjusting the pressure difference between the 3) and the second control spool 4. Of course, the opening degree of the variable orifice valve (5) is controlled by the electromagnetic proportional valve (7), in this case the direction control valve (6) to achieve a communication state between the variable orifice valve (5) and the electromagnetic proportional valve (7) do. The direction control valve 6 forms a communication state between the variable orifice valve 5 and the electromagnetic proportional valve 7 as the spring of the direction control valve 6 is pushed by the hydraulic pressure from the shuttle valve 10. This is because the oil on the side is returned to the tank 20 through the bypass line 21.

다음에 제2작동기(12)를 단독으로 조작할 시에는 가변오리피스밸브(5)가 방향제어밸브(6)를 통하여 탱크로 배수되므로, 이경우에는 가변오리피스밸브(5)는 설치되지 않은 것과 동일한 효과를 가져온다. 즉, 이 경우에는 유압회로의 구성이 제2작동기(12), 제2제어스룰(4), 탱크(20)로 이루어지는 폐회로를 구성하게 되어, 가변오리피스밸브(5)를 통하여 입력손실이 발생되는 문제점은 없어지게 된다. 상기 방향제어밸브(6)가 가변오리피스밸브(5)와 탱크(20)와의 연통상태를 이루는 것은 셔틀밸브(10)로부터의 유압이 없을 때 방향제어밸브(6)의 바이패스라인(21)이 개방되고 전자비례밸브(7)로 부터의 압유는 가변오리피스밸브(5)로 전달이 안되기 때문이다.Next, when the second actuator 12 is operated alone, the variable orifice valve 5 is drained to the tank through the directional control valve 6, so in this case, the variable orifice valve 5 has the same effect as not being installed. Bring it. That is, in this case, the hydraulic circuit constitutes a closed circuit composed of the second actuator 12, the second control rule 4, and the tank 20, so that an input loss occurs through the variable orifice valve 5. The problem is eliminated. The direction control valve (6) is in communication with the variable orifice valve (5) and the tank 20 is that the bypass line 21 of the direction control valve (6) when there is no hydraulic pressure from the shuttle valve (10) This is because the open and pressurized oil from the electromagnetic proportional valve 7 cannot be delivered to the variable orifice valve 5.

Claims (1)

유압탱크(20), 유압탱크내의 유압유를 송출하기 위한 펌프(1), 제1작동기(11)를 작동시키기 위한 제1제어스풀(3), 제2작동기(12)를 작동시키기 위한 제2제어스풀(4), 상기 제1 및 제2제어스풀(3)(4)을 조절하여 각각 상기 제1 및 제2작동기(11)(12)를 조절하기 위한 제1 및 제2조절밸브(8)(9), 상기 제1제어스풀(3)과 제2제어스풀(4)의 사이에 위치하여 제1 및 제2제어스풀(3)(4)사이의 유압연통을 가능케 하는 가변오리피스밸브(5), 및 상기 가변오리피스밸브(5)의 개구면적을 제어하기 위한 전자비례밸브(7)로 구성되는 유압회로에 있어서, 상기 제1 및 제2조절밸브(8)(9)중의 한쪽으로 형성하는 셔틀밸브(10), 및 상기 셔틀밸브(10)에 연결되어 상기 제1 및 제2조절밸브(8)(9)중의 하나가 작동되거나 또는 제1 및 제2조절밸브(8)(9)가 동시에 제어작동될 경우에만 가변오리피스밸브(5)가 상기 제1 및 제2제어스풀(3)(4)을 연통시키는 회로의 개구도를 조절하고, 상기 제1 및 제2조절밸브(8)(9)중의 다른 하나만이 작동될 경우에는 상기 가변오리피스밸브(5)를 탱크(20)로 배수시켜 제1 및 제2제어스풀(3)(4)을 완전히 연통시키는 방향제어밸브(6)로 구성되는 것을 특징으로 하는 압력손실 방지유압회로.Hydraulic tank 20, pump 1 for delivering hydraulic oil in the hydraulic tank, first control spool 3 for operating the first actuator 11, second control for operating the second actuator 12 First and second regulating valves 8 for adjusting the first and second actuators 11 and 12 by adjusting the spool 4 and the first and second control spools 3 and 4, respectively. (9) a variable orifice valve (5) positioned between the first control spool (3) and the second control spool (4) to enable hydraulic communication between the first and second control spools (3) (4). And an electromagnetic proportional valve (7) for controlling the opening area of the variable orifice valve (5), which is formed on one of the first and second regulating valves (8) and (9). Shuttle valve 10 and the shuttle valve 10 is connected to one of the first and second control valve (8) (9) is activated or the first and second control valve (8) (9) Variable orifice valves only (5) ) Adjusts the opening of the circuit communicating the first and second control spools (3) (4), and when only one of the first and second control valves (8) (9) is actuated, A pressure loss prevention hydraulic circuit, characterized in that consisting of a directional control valve (6) for draining the variable orifice valve (5) to the tank (20) to completely communicate the first and second control spool (3) (4).
KR2019930023178U 1993-11-06 1993-11-06 Hydraulic circuit having pressure loss protective function by direction control valve KR960010220Y1 (en)

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KR2019930023178U KR960010220Y1 (en) 1993-11-06 1993-11-06 Hydraulic circuit having pressure loss protective function by direction control valve

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KR960010220Y1 true KR960010220Y1 (en) 1996-11-28

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