KR200308827Y1 - A hydraulic system for crane - Google Patents

A hydraulic system for crane Download PDF

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Publication number
KR200308827Y1
KR200308827Y1 KR20-2002-0037667U KR20020037667U KR200308827Y1 KR 200308827 Y1 KR200308827 Y1 KR 200308827Y1 KR 20020037667 U KR20020037667 U KR 20020037667U KR 200308827 Y1 KR200308827 Y1 KR 200308827Y1
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South Korea
Prior art keywords
hydraulic
hydraulic pressure
crane
supplied
passage
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KR20-2002-0037667U
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Korean (ko)
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손덕영
홍석균
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동양기전 주식회사
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Priority to KR20-2002-0037667U priority Critical patent/KR200308827Y1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/20—Control systems or devices for non-electric drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/54—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/02—Driving gear
    • B66D1/08—Driving gear incorporating fluid motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/03—Cranes with arms or jibs; Multiple cranes
    • B66C2700/0321—Travelling cranes
    • B66C2700/0357—Cranes on road or off-road vehicles, on trailers or towed vehicles; Cranes on wheels or crane-trucks

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

각 구동부의 동작속도가 증진되고 동작이 원할하도록 한 크레인의 유압회로시스템에 관한 것이다. 동력인출장치(110)에 의해서 엔진(100)으로부터 인출된 동력은 두개의 제1,2유압펌프(120)(130)를 구동하고, 발생된 유압은 제1유압모터(10), 경사실린더(20), 신축실린더(30) 및 제2,3유압모터(40)(50)를 작동시키도록 각 구동부에 공급된다. 유압제어밸브(15)(25)(35)(45)(55)들은 조작신호에 따라 유압의 흐름을 제어하도록 작동된다. 제1유압펌프(120)로부터 토출되는 제1유압은 제1유로(140)를 경유하고, 제2유압펌프(130)로부터 발생된 제2유압은 제2유로(150)를 경유한다. 제1유로를 통하여 제1유압모터와 신축실린더 및 경사실린더에 유압이 공급되고, 제2유로(150)를 통하여 제2,3유압모터(40)(50)에 유압이 공급되도록 한다. 이와 같은 유압회로시스템은 부하가 큰 구동부와 부하가 작은 구동부를 두개의 유압펌프에 의해 분할하여 유압을 공급시킴으로써, 구동부의 구동속도가 증진될 뿐만 아니라 복수의 구동부가 동시에 작동할때 그 구동이 원할해진다.It relates to a hydraulic circuit system of a crane so that the operation speed of each drive unit is enhanced and the operation is smooth. Power drawn out from the engine 100 by the power take-off device 110 drives two first and second hydraulic pumps 120 and 130, and the generated hydraulic pressure is the first hydraulic motor 10 and the inclined cylinder ( 20), the expansion cylinder 30 and the second and third hydraulic motors 40, 50 are supplied to each drive unit to operate. The hydraulic control valves 15, 25, 35, 45 and 55 are operated to control the flow of hydraulic pressure in accordance with an operation signal. The first hydraulic pressure discharged from the first hydraulic pump 120 passes through the first flow passage 140 and the second hydraulic pressure generated from the second hydraulic pump 130 passes through the second flow passage 150. Hydraulic pressure is supplied to the first hydraulic motor, the expansion cylinder, and the inclined cylinder through the first passage, and the hydraulic pressure is supplied to the second and third hydraulic motors 40 and 50 through the second passage 150. The hydraulic circuit system is configured to supply hydraulic pressure by dividing the high load drive unit and the low load drive unit by two hydraulic pumps, so that the driving speed of the drive unit is not only increased, but also when the plurality of drive units are operated simultaneously. Become.

Description

크레인의 유압시스템{A hydraulic system for crane }Hydraulic system for crane

본 고안은 크레인의 유압시스템에 관한 것으로써, 더 상세하게는 붐대의 경사 및 신축작동과 훅크의 견인을 위한 윈치작동 및 붐대의 선회를 위한 선회작동등 크레인의 각 구동부가 원할하게 작동되고 신속하게 작동되도록 두개의 유압펌프를 가지는 크레인의 유압시스템에 관한 것이다.The present invention relates to a hydraulic system of a crane, and more specifically, each driving unit of the crane is smoothly operated and quickly operated, such as tilting and stretching operation of the boom and winch operation for towing the hook and turning operation for turning the boom. A hydraulic system of a crane having two hydraulic pumps for operation.

도 1에 도시된 바와 같이, 크레인은 주행이 가능하고 또한 하중체의 견인등 특수작업을 위한 구동부가 마련되어 있다.As shown in FIG. 1, the crane is capable of traveling and is provided with a driving unit for special work such as traction of a load body.

크레인의 구동부는 제1유압모터(10)에 의해 선회되는 회전블럭(11)과, 이 회전블럭(11)에 회동가능하게 지지되고 내장된 신축실린더(30)에 의해 신축작동되는 붐대(36)와, 이 붐대(36)의 경사작동을 제어하는 경사실린더(20)와, 하중체를 견인시키는 훅크(41)(51)를 견인하는 메인윈치(42)와 보조윈치(52)를 구비한다. 이들 윈치(42)(52)들은 도 2에 도시된 바와 같이, 제2,3유압모터(40)(50)에 의해 구동된다.The driving unit of the crane is a rotary block 11 which is pivoted by the first hydraulic motor 10 and a boom 36 which is telescopically operated by the expansion cylinder 30 which is rotatably supported and built in the rotary block 11. And a inclined cylinder 20 for controlling the inclined operation of the boom 36, a main winch 42 and an auxiliary winch 52 for pulling the hooks 41 and 51 for pulling the load body. These winches 42 and 52 are driven by second and third hydraulic motors 40 and 50, as shown in FIG.

이와 같은 크레인의 특수구동부는 엔진으로부터 동력인출장치(PTO;power take off)에 의해 동력을 인출하여 구동원으로서 이용된다.The special driving unit of such a crane draws power from the engine by a power take off (PTO) and is used as a driving source.

즉, 도 2를 참조하면, 동력인출장치(110)에 의해서 엔진(100)으로부터 인출된 동력은 유압펌프(120)를 구동하고, 발생된 유압은 상기 경사실린더(20), 제2,3유압모터(40)(50), 신축실린더(30) 및 제1유압모터(10)를 작동시키도록 각 구동부에 공급된다.That is, referring to FIG. 2, the power drawn out from the engine 100 by the power take-off device 110 drives the hydraulic pump 120, and the generated hydraulic pressure is the inclined cylinder 20, the second and third hydraulic pressures. It is supplied to each drive unit to operate the motors 40 and 50, the expansion cylinder 30 and the first hydraulic motor 10.

이들 각 구동부(10)(20)(30)(40)(50)는 운전조작에 의해서 선택적으로 또는 일부 구동부들이 함께 구동되며, 이때 유압제어밸브(15)(25)(35)(45)(55)들은 조작신호에 따라 유압의 흐름을 제어하도록 작동된다.Each of these driving units 10, 20, 30, 40 and 50 is selectively driven or partly driven together by a driving operation, wherein the hydraulic control valves 15, 25, 35 and 45 ( 55) are operated to control the flow of the hydraulic pressure in accordance with the operation signal.

예컨대, 메인윈치(42)의 구동으로 훅크(41)가 견인되거나, 회전블럭(11)이 선회되면서 붐대(36)가 상방향으로 경사지게 작동될 수 있다.For example, the hook 41 may be towed by the driving of the main winch 42, or the boom 36 may be inclined upward while the rotary block 11 is pivoted.

또한, 신축실린더(30)의 작동으로 붐대(36)가 신축되면서 메인윈치(42)에 의한 훅크(41)가 견인되도록 동시작동이 이루어질 수 있다.In addition, simultaneous operation may be made such that the hook 41 is pulled by the main winch 42 while the boom 36 is stretched by the operation of the expansion cylinder 30.

한편, 상기 구동부들중 회전블럭(11)은 붐대(36)들이 탑재되는 등으로 기본적으로 중량이므로 이를 선회시키는 제1유압모터(10)는 큰부하가 작용하게 되며, 또한 신축실린더(30)와 경사실린더(20)도 큰 부하가 작용하게 된다.On the other hand, the rotation block 11 of the driving unit is basically the weight, such as the boom base 36 is mounted, so that the first hydraulic motor 10 for turning it is a large load, and also the expansion cylinder 30 and Large load also acts on the inclined cylinder 20.

그러나, 메인윈치(42)와 보조윈치(52)가 훅크(41)(51)에 하중체를 견인하지 않은 상태에서 작동되는 경우 제2,3유압모터(40)(50)는 작은 부하가 작용하게 되고, 반대로 하중체를 견인한 상태에서 작동하는 경우에는 큰부하가 작용하게 된다.However, when the main winch 42 and the auxiliary winch 52 are operated without towing a load on the hooks 41 and 51, the second and third hydraulic motors 40 and 50 have a small load. On the contrary, when operating in a state where the load is towed, a large load acts.

이러한 크레인의 작동에 있어서, 두개 이상의 구동부가 동시에 작동할때 그 구동이 원할하지 못하다. 즉, 부하가 큰 신축실린더(30)의 작동으로 붐대(36)가 신축되면서 부하가 상대적으로 작은(하중체를 견인하지 않은 상태에서 작동할때) 메인윈치(42)에 의한 훅크(41)가 견인되도록 동시작동이 이루어질 때, 유압펌프(120)로부터의 유압은 메인윈치(40)를 경유하여 신축실린더(30)에 공급되므로 유압의 공급이 원할치 못하여 동시 작동이 원할하지 못하게 된다. 즉, 작은 압력의 유압으로도 구동이 가능한 구동부와 큰압력이 필요한 구동부가 동시에 작동됨으로써 그 구동이 원할하지 못하게 된다.In the operation of such a crane, the drive is not desired when two or more drives are operated simultaneously. That is, as the boom 36 is stretched by the operation of the expansion cylinder 30 having a large load, the hook 41 by the main winch 42 having a relatively small load (when operating without a towing load) is When the simultaneous operation is to be towed, the hydraulic pressure from the hydraulic pump 120 is supplied to the expansion cylinder 30 via the main winch 40, so that the supply of the hydraulic pressure is not desired, the simultaneous operation is not desired. That is, the driving unit that can be driven even with a small pressure hydraulic pressure and the driving unit that requires a large pressure are operated at the same time, so that the driving is not desired.

또한, 상기와 같은 종래의 유압회로시스템을 가지는 크레인은 하나의 유압펌프(120)에 의해서 발생된 유압이 순차적으로 각 구동부에 공급되므로 각 구동부의 동작속도가 느리다.In addition, in the crane having the conventional hydraulic circuit system as described above, since the hydraulic pressure generated by one hydraulic pump 120 is sequentially supplied to each driving unit, the operation speed of each driving unit is slow.

본 고안은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로써, 크레인의 붐대의 신축실린더, 붐대의 경사실린더, 훅크 견인을 위한 메인윈치 및 보조윈치와 회전블럭의 선회를 위한 구동부에 유압을 분배하여 공급함으로써 보다 신속하고 동시작동이 원할하도록 한 크레인의 유압회로시스템을 제공하는 데 그 목적이 있다.The present invention has been devised to solve the above problems, by distributing the hydraulic pressure in the expansion cylinder of the boom of the crane, the inclined cylinder of the boom, the main winch for the hook traction and the drive unit for turning the auxiliary winch and the rotating block The objective is to provide a hydraulic circuit system for a crane that allows for faster and more simultaneous operation by supplying it.

도 1은 크레인을 나타낸 개략도,1 is a schematic view showing a crane,

도 2는 종래 크레인의 유압회로도,2 is a hydraulic circuit diagram of a conventional crane;

도 3은 본 고안 유압회로도이다.3 is a hydraulic circuit diagram of the present invention.

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

10...제1유압모터 20...경사실린더10 ... 1st hydraulic motor 20 ... inclined cylinder

30...신축실린더 40,50...제2,3유압모터30. Expansion cylinder 40, 50 ... 2, 3 hydraulic motor

100...엔진 110...동력인출장치100.Engine 110.Power take-off

120...제1유압펌프 130...제2유압펌프120 ... 1st hydraulic pump 130 ... 2nd hydraulic pump

140...제1유로 150...제2유로140 ... 1 Euro 150 ... 2 Euro

상기 목적을 달성하는 본 고안은 제1유압모터에 의해 선회되는 회전블럭과, 이 회전블럭에 회동가능하게 지지되고 신축실린더에 의해 신축작동되는 붐대와, 이 붐대의 경사각도를 제어하는 경사실린더와, 제1훅크를 견인하는 메인윈치가 제2유압모터에 의해 유압구동되도록 유압펌프로부터 각 구동부에 유압을 공급하는 크레인의 유압회로시스템에 있어서,The present invention to achieve the above object is a rotary block pivoted by a first hydraulic motor, a boom that is rotatably supported by the rotary block and telescopically operated by a telescopic cylinder, and an inclined cylinder for controlling the inclination angle of the boom; In the hydraulic circuit system of the crane for supplying hydraulic pressure to each drive unit from the hydraulic pump so that the main winch to pull the first hook is hydraulically driven by the second hydraulic motor,

상기 유압펌프는 엔진의 동력으로 구동되는 제1유압펌프와 제2유압펌프를 구비하고, 상기 제1유압펌프로부터 발생된 제1유압이 경유하는 제1유로와, 상기 제2유압펌프로부터 발생된 제2유압이 경유하는 제2유로를 구비하고, 상기 제1유로를 통하여 상기 제1유압모터와 신축실린더 및 경사실린더에 유압이 공급되고, 상기 제2유로를 통하여 상기 제2유압모터에 유압이 공급되도록 된 것을 특징으로 한다.The hydraulic pump includes a first hydraulic pump and a second hydraulic pump driven by the power of an engine, the first hydraulic passage generated by the first hydraulic pressure generated from the first hydraulic pump, and the second hydraulic pump generated from the second hydraulic pump. A second flow passage through which the second hydraulic pressure passes, and hydraulic pressure is supplied to the first hydraulic motor, the expansion cylinder, and the inclined cylinder through the first flow passage, and hydraulic pressure is supplied to the second hydraulic motor through the second flow passage. Characterized in that it is to be supplied.

또한, 상기 유압시스템에는 제2훅크를 견인하는 보조윈치와, 이 보조윈치를 구동하는 제3유압모터가 더 구비되고, 상기 제3유압모터는 상기 제2유로를 통한 유압에 의해 구동된다.The hydraulic system further includes an auxiliary winch for pulling the second hook and a third hydraulic motor for driving the auxiliary winch, wherein the third hydraulic motor is driven by hydraulic pressure through the second flow path.

상기 본 고안의 특징에 의하면, 본 고안 시스템은 부하가 큰 구동부와 부하가 작은 구동부를 분할하여 유압을 공급시킴으로써, 구동부의 구동속도가 빠를 뿐만 아니라 복수의 구동부가 동시 작동할때 그 구동이 원할해진다.According to the above features of the present invention, the system of the present invention divides the drive unit with a large load and the drive unit with a low load to supply hydraulic pressure, so that not only the driving speed is high but also a plurality of drives are driven at the same time. .

이하 첨부된 도면을 참조하면서 본 고안에 따른 바람직한 실시예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1 및 도 3을 참조하면, 본 고안이 적용되는 크레인은 도 1에 도시된 바와 같은 통상적인 크레인의 주요 구동부를 가진다. 크레인의 구동부는 제1유압모터(10)에 의해 선회되는 회전블럭(11)과, 이 회전블럭(11)에 회동가능하게 지지되고 내장된 신축실린더(30)에 의해 신축작동되는 붐대(36)와, 이 붐대(36)의 경사작동을 제어하는 경사실린더(20)와, 하중체를 견인하는 훅크(41)(51)를 견인하는 메인윈치(42)와 보조윈치(52)를 구비한다. 이들 윈치(42)(52)들은 도 3에 도시된 바와 같이, 제2,3유압모터(40)(50)에 의해 구동된다.1 and 3, the crane to which the present invention is applied has a main drive of a conventional crane as shown in FIG. The driving unit of the crane is a rotary block 11 which is pivoted by the first hydraulic motor 10 and a boom 36 which is telescopically operated by the expansion cylinder 30 which is rotatably supported and built in the rotary block 11. And the inclined cylinder 20 for controlling the inclined operation of the boom 36, the main winch 42 and the auxiliary winch 52 for pulling the hooks 41 and 51 for pulling the load body. These winches 42 and 52 are driven by second and third hydraulic motors 40 and 50, as shown in FIG.

이와 같은 크레인의 구동부는 엔진(100)으로부터 동력인출장치(PTO;power take off)(110)에 의해 동력을 인출하여 구동원으로서 이용된다.The driving unit of such a crane draws power from the engine 100 by a power take off (PTO) 110 and is used as a driving source.

즉, 도 3을 참조하면, 동력인출장치(110)에 의해서 엔진(100)으로부터 인출된 동력은 제1,2유압펌프(120)(130)를 구동하고, 발생된 유압은 상기 제1유압모터(10), 경사실린더(20), 신축실린더(30) 및 제2,3유압모터(40)(50)를 작동시키도록 각 구동부에 공급된다.That is, referring to FIG. 3, the power drawn out from the engine 100 by the power take-off device 110 drives the first and second hydraulic pumps 120 and 130, and the generated hydraulic pressure is the first hydraulic motor. 10, the inclined cylinder 20, the expansion cylinder 30 and the second and third hydraulic motors 40, 50 are supplied to each drive unit to operate.

이들 각 구동부(10)(20)(30)(40)(50)는 운전조작에 의해서 선택적으로 또는 일부 구동부들이 함께 구동되며, 이때 유압제어밸브(15)(25)(35)(45)(55)들은 조작신호에 따라 유압의 흐름을 제어하도록 작동된다.Each of these driving units 10, 20, 30, 40 and 50 is selectively driven or partly driven together by a driving operation, wherein the hydraulic control valves 15, 25, 35 and 45 ( 55) are operated to control the flow of the hydraulic pressure in accordance with the operation signal.

한편, 상기 동력인출장치(110)로부터의 동력은 두개의제1,2유압펌프(120)(130)를 동시에 구동시킨다.On the other hand, the power from the power take-off unit 110 drives the two first and second hydraulic pumps 120 and 130 at the same time.

상기 제1유압펌프(120)로부터 발생된 제1유압은 제1유로(140)를 경유하게 되고, 상기 제2유압펌프(130)로부터 발생된 제2유압은 제2유로(150)를 경유하게 된다.The first hydraulic pressure generated from the first hydraulic pump 120 passes through the first flow passage 140, and the second hydraulic pressure generated from the second hydraulic pump 130 passes through the second flow passage 150. do.

상기 제1유로(140)를 통한 제1유압은 제1유압모터(10)와 신축실린더(20) 및 경사실린더(30)에 유압이 공급되고, 상기 제2유로(150)를 통한 제2유압은 상기 제2유압모터(40)에 유압이 공급되도록 한다. 이때 제2유로(150)를 통하여는 보조윈치(52)를 구동하는 제3유압모터(50)에 유압이 공급되도록 함께 설치되어 있다.The first hydraulic pressure through the first passage 140 is supplied with hydraulic pressure to the first hydraulic motor 10, the expansion cylinder 20, and the gradient cylinder 30, and the second hydraulic pressure through the second passage 150. The hydraulic pressure is supplied to the second hydraulic motor 40. At this time, it is installed together so that the hydraulic pressure is supplied to the third hydraulic motor 50 for driving the auxiliary winch 52 through the second passage (150).

상기와 같은 본 고안 유압시스템은, 각 구동부(10)(20)(30)(40)(50)를 선택적으로 운전조작함에 따라 각 제어밸브(15)(25)(35)(45)(55)의 제어에 의해 유압이 공급되어 작동토록 한다.The hydraulic system of the present invention as described above, the respective control valves (15), (25), (35) (45) (55) by selectively operating the respective drive units (10, 20, 30, 40, 50). The hydraulic pressure is supplied and operated by the control of).

예컨대, 큰부하가 요구되는 제1유압모터(10)에 의해 회전블럭(11)을 선회키고자 하는 경우, 제1유로(140)를 통하여 유압이 제어밸브(15)를 통하여 제1유압모터(10)에 공급된다.For example, when the rotary block 11 is to be rotated by the first hydraulic motor 10 requiring a large load, the hydraulic pressure is controlled by the first hydraulic motor through the control valve 15 through the first passage 140. 10) is supplied.

또한, 회전블럭(11)의 선회와 동시에 메인윈치(42)의 구동으로 훅크(41)를 하강시키고자는 경우에는, 제1유압펌프(120)로부터 발생된 유압은 제1유로(140)를 통하여 제1유압모터(10)에 공급되고 제2유로(150)를 통하여 제2유압모터(40)에 유압이 공급된다.In addition, when the hook 41 is to be lowered by the rotation of the rotary block 11 and the main winch 42 is driven, the hydraulic pressure generated from the first hydraulic pump 120 is transferred through the first channel 140. The first hydraulic motor 10 is supplied and the hydraulic pressure is supplied to the second hydraulic motor 40 through the second flow path 150.

또한, 부하가 큰 구동부 즉, 제1유압모터(10), 경사실린더(20) 및 신축실린더(30)가 함께 구동되고, 또한 메인윈치(42)를 구동하는 제2유압모터(40)가 함께 구동될때에는, 제1유로(140)를 통하여 유압이 공급되어 구동부(10)(20)(30)가 구동되게 되고, 제2유로(150)를 통하여 제2유압모터(40)가 구동된다.In addition, the driving unit with a large load, that is, the first hydraulic motor 10, the tilt cylinder 20 and the expansion cylinder 30 are driven together, and the second hydraulic motor 40 driving the main winch 42 together When driven, the hydraulic pressure is supplied through the first flow passage 140 to drive the driving units 10 and 20 and 30, and the second hydraulic motor 40 is driven through the second flow passage 150.

이와 같이 부하가 큰 구동부(10)(20)(30)들이 제1유로(140)를 통하여 동일 압력으로 공급되는 유압에 의해 작동되므로 동작특성이 양호하게 되고, 또한 제1,2유로(140)(150)를 통하여 분할되어 유압이 공급됨으로써 구동부의 구동속도가 증진된다.As such, the driving unit 10, 20, 30 with a large load is operated by the hydraulic pressure supplied at the same pressure through the first passage 140, so that the operation characteristics are good, and the first and second passages 140 are provided. The driving speed is increased by dividing through 150 to supply hydraulic pressure.

한편, 제1유압모터(10), 경사실린더(20) 및 신축실린더(30)가 작동하지 않고, 제2유압모터(40)와 제3유압모터(50)가 작동할때 유압은 제1유로(140)를 경유하여 제2유로(150)와 합류되어 제2,3유압모터(40)(50)에 공급됨으로써 그 구동속도가 증진된다.On the other hand, when the first hydraulic motor 10, the inclined cylinder 20 and the expansion cylinder 30 does not operate, the second hydraulic motor 40 and the third hydraulic motor 50 operates, the hydraulic pressure is the first flow path. The driving speed is improved by joining with the second flow path 150 via the 140 and being supplied to the second and third hydraulic motors 40 and 50.

상술한 바와 같은 본 고안은 상기 실시예에 한정되지 아니하고 본원 고안의 정신과 범위를 이탈함이 없이 많은 변형을 가하여 실시될 수 있다.The present invention as described above is not limited to the above embodiment and can be carried out by adding many modifications without departing from the spirit and scope of the present invention.

상술한 바와 같은 본 고안 유압시스템은 부하가 큰 구동부와 부하가 작은 구동부를 각각의 유압펌프에 의해서 유압을 공급시킴으로써, 구동부의 구동속도가 증진될 뿐만 아니라 복수의 구동부가 동시에 작동할때 그 구동이 원할해진다.In the hydraulic system of the present invention as described above, by supplying hydraulic pressure by the hydraulic pump of each of the high load drive unit and the low load drive unit, not only the driving speed of the drive unit is increased, but also the driving is performed when a plurality of drive units are operated at the same time. You want it.

또한, 부하가 큰 구동부가 작동하지 않을때 유압이 합류되어 부하가 작은 구동부를 작동시킴으로써 구동부의 구동속도를 대폭 증진시킨다.In addition, when the driving unit with a large load is not operated, the hydraulic pressure is joined to operate the driving unit with a small load, thereby greatly increasing the driving speed of the driving unit.

Claims (2)

제1유압모터에 의해 선회되는 회전블럭과, 이 회전블럭에 회동가능하게 지지되고 신축실린더에 의해 신축작동되는 붐대와, 이 붐대의 경사각도를 제어하는 경사실린더와, 제1훅크를 견인하는 메인윈치가 제2유압모터에 의해 유압구동되도록 유압펌프로부터 각 구동부에 유압을 공급하는 크레인의 유압회로시스템에 있어서,A rotating block pivoted by the first hydraulic motor, a boom pivotally supported by the rotating block and telescopically operated by a telescopic cylinder, an inclined cylinder for controlling the inclination angle of the boom, and a main towing the first hook In the hydraulic circuit system of the crane for supplying hydraulic pressure to each drive unit from the hydraulic pump so that the winch is hydraulically driven by the second hydraulic motor, 상기 유압펌프는 엔진의 동력으로 구동되는 제1유압펌프와 제2유압펌프를 구비하고,The hydraulic pump has a first hydraulic pump and a second hydraulic pump driven by the power of the engine, 상기 제1유압펌프로부터 발생된 제1유압이 경유하는 제1유로와,A first passage through which the first hydraulic pressure generated from the first hydraulic pump passes; 상기 제2유압펌프로부터 발생된 제2유압이 경유하는 제2유로를 구비하고,A second flow passage through which the second hydraulic pressure generated from the second hydraulic pump passes; 상기 제1유로를 통하여 상기 제1유압모터와 신축실린더 및 경사실린더에 유압이 공급되고, 상기 제2유로를 통하여 상기 제2유압모터에 유압이 공급되도록 된 것을 특징으로 하는 크레인의 유압시스템.Hydraulic pressure is supplied to the first hydraulic motor, the expansion cylinder and the inclined cylinder through the first passage, the hydraulic system of the crane characterized in that the hydraulic pressure is supplied to the second hydraulic motor through the second passage. 제 1 항에 있어서, 제2훅크를 견인하는 보조윈치와, 이 보조윈치를 구동하는 제3유압모터가 더 구비되고, 상기 제3유압모터는 상기 제2유로를 통한 유압에 의해 구동되도록 된 것을 특징으로 하는 크레인의 유압시스템.According to claim 1, wherein the auxiliary winch for pulling the second hook, and the third hydraulic motor for driving the auxiliary winch is further provided, wherein the third hydraulic motor is to be driven by the hydraulic pressure through the second flow path Hydraulic system of the crane.
KR20-2002-0037667U 2002-12-17 2002-12-17 A hydraulic system for crane KR200308827Y1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101209136B1 (en) 2004-07-28 2012-12-06 볼보 컨스트럭션 이큅먼트 에이비 Hydraulic system and work machine comprising such a system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101209136B1 (en) 2004-07-28 2012-12-06 볼보 컨스트럭션 이큅먼트 에이비 Hydraulic system and work machine comprising such a system

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