KR200486065Y1 - lacking valve of poclain - Google Patents

lacking valve of poclain Download PDF

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Publication number
KR200486065Y1
KR200486065Y1 KR2020170000595U KR20170000595U KR200486065Y1 KR 200486065 Y1 KR200486065 Y1 KR 200486065Y1 KR 2020170000595 U KR2020170000595 U KR 2020170000595U KR 20170000595 U KR20170000595 U KR 20170000595U KR 200486065 Y1 KR200486065 Y1 KR 200486065Y1
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KR
South Korea
Prior art keywords
flow path
fluid
port
pressure
valve
Prior art date
Application number
KR2020170000595U
Other languages
Korean (ko)
Inventor
임사현
Original Assignee
주식회사 대진에이치에스
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Priority to KR2020170000595U priority Critical patent/KR200486065Y1/en
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Publication of KR200486065Y1 publication Critical patent/KR200486065Y1/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/085—Ground-engaging fitting for supporting the machines while working, e.g. outriggers, legs
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2257—Vehicle levelling or suspension systems
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • 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
    • F15B13/027—Check 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve

Abstract

The locking valve controls the posture of the excavator body by controlling the oscillating cylinder installed on the left and right sides between the excavator body and the lower frame. The locking valve includes an inlet port through which fluid is injected, A first outlet port connected to the oscillating cylinder and a second outlet port connected to the oscillating cylinder on the right side and connected to the oscillating cylinder, a first flow path communicating with the inlet port, and a second flow path communicating with the inlet port, A valve body formed with a second flow path communicating with the left discharge port and the right discharge port; A pressure reducing valve installed inside the valve body and connected to the inlet port to reduce the pressure of the introduced fluid and discharge the fluid to the first flow path and the second flow path; A pair of plungers provided at both ends of the first flow path and communicating with the first flow path and operated forward and backward by the pressure of the fluid in the first flow path; The valve body is connected to the left exhaust port and the right exhaust port and is operated by forward movement of the plunger so as to communicate with the second flow path and the left exhaust port and the right exhaust port, And a pair of check valves for allowing the fluid to be supplied to the left and right oscillating cylinders in two flow paths.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a locking valve for an excavator,

The present invention relates to a locking valve for an excavator attitude control, and relates to a locking valve for an excavator attitude control that controls the operation of left and right oscillating cylinders installed on the body of an excavator.

The wheel type excavator can be easily divided into an excavator main body on which an occupant is mounted on an upper part and a lower frame provided with a tire for movement on the lower part.

In order to tilt the body of the excavator to the left or right or to fix the angle of the excavator body according to the work or to allow the escape of the tire from the puddle or the porter hole, An oscillating cylinder is connected between the body and the lower frame.

Conventionally, the oscillating cylinder is normally installed in two places on the opposite sides of the dozer blade mounting. In order to control the operation of the two oscillating cylinders, the control valve must be installed separately, which is expensive and difficult to control the attitude of the excavator main body Has come.

KR 10-2008-0029358 A

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an excavator attitude control locking valve capable of controlling the flow of fluid by means of a single control valve in left and right oscillating cylinders, The purpose of this paper is to provide

In order to achieve the above object, the present invention provides a locking valve for controlling the position of an excavator body by controlling an oscillating cylinder installed between left and right sides between an excavator body and a lower frame, A first flow path communicating with the inlet port and formed with a right outlet port connected to an oscillating cylinder on the right side and a left outlet port connected to an oscillating cylinder on the left side, A valve body communicating with the inlet port and having a second flow path communicating with the left outlet port and the right outlet port, respectively; A pressure reducing valve installed inside the valve body and connected to the inlet port to reduce the pressure of the introduced fluid and discharge the fluid to the first flow path and the second flow path; A pair of plungers provided at both ends of the first flow path and communicating with the first flow path and operated forward and backward by the pressure of the fluid in the first flow path; The valve body is connected to the left exhaust port and the right exhaust port and is operated by forward movement of the plunger so as to communicate with the second flow path and the left exhaust port and the right exhaust port, And a pair of check valves for allowing the fluid to be supplied to the left and right oscillating cylinders in two flow paths.

And a chamber in which the check valve is installed are formed at both ends of the second flow path.

Wherein the check valve is provided in the chamber to divide a front chamber and a rear chamber connected to the left and right discharge ports and to move forward and backward by the pressure of the fluid in the second passage, A second gauge pit which is inserted into the first end of the first gauge pit so as to protrude outward and which is moved into the first gauge pit by the plunger advance to open the front end, And a spring provided on the end of the pit for forward movement.

The front chamber is formed with a stepped boundary so that its cross-sectional area is smaller than that of the rear chamber. The first hollow pit is moved forward or backward by the pressure difference of the fluid to be closely attached to or spaced from the boundary, And a leg portion formed on the lower portion of the head portion and formed with an inner space and formed with a communication hole through which fluid flows inside and outside, the second hollow fiber pit is inserted into the through hole and is in contact with the plunger A head portion which is provided to be moved forward and backward and which is extended to an end portion of the head portion and closely or spaced to a boundary between the through hole and the inner space of the first dummy pit, And a leg portion having a communication hole formed on an outer side thereof.

Wherein the pressure reducing valve includes a cover which is installed to penetrate the first flow path and the second flow path central portion and communicate with the first flow path and the second flow path respectively, And a spool which moves upward by the pressure of the fluid of 2 flow paths to shut off the flow of the fluid by closing the inlet port and the first flow path.

According to the present invention having the above-described configuration, the following effects can be expected.

The locking valve for the excavator attitude control according to the present invention can control the posture of the excavator body by supplying fluid to the left and right oscillating cylinders with a single locking valve. Here, the oscillating cylinders on the left and right sides are connected to each other, and when an excessive load is transmitted to one place, fluid can be supplied to other places to control the attitude of the excavator body.

Further, the check valve is made of a double poppet structure, so that a pressure shock caused by a sudden operation can be prevented.

1 is a block diagram of a locking valve for controlling an excavator according to an embodiment of the present invention;
FIG. 2 is a fluid flow diagram according to an embodiment of the present invention in accordance with the pressure supply of a locking valve for an excavator attitude control. FIG.
3 is a fluid flow diagram of a locking valve for an excavator attitude control according to an embodiment of the present invention upon reaching a set value of a pressure reducing valve.
FIG. 5 is a fluid flow diagram of a right side oscillating cylinder under load operation in a locking valve for excavator attitude control according to an embodiment of the present invention. FIG.
FIG. 5 is a flow chart of a hydraulic operation of a left oscillating cylinder in a locking valve for an excavator attitude control according to an embodiment of the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a locking valve for controlling an excavator according to an embodiment of the present invention.

Referring to FIG. 1, the locking valve controls the posture of the excavator body by controlling the oscillating cylinders A and B installed on the left and right sides between the excavator body and the lower frame, 100, a pressure reducing valve 200, a pair of plungers 300, and a pair of check valves 400 to control both of the left and right oscillating cylinders A, B.

The valve body 100 corresponds to the body of the locking valve, that is, the case, and the pressure reducing valve 200, the plunger 300, and the check valve 400 can be installed. A flow path is formed.

In detail, the valve body 100 is provided with an inlet port 110 through which a fluid is injected, a left outlet port 120 connected to the left oscillating cylinder A, and a right outlet port 120 connected to the right oscillating cylinder B The right discharge port 130 is formed. The valve body 100 includes a first flow path 140 communicating with the inlet port 110 and a second flow path 140 communicating with the inlet port 110 and having opposite sides communicating with the left outlet port 120 and the right outlet And a second flow path 150 communicating with the port 130 is formed.

Inside the valve body 100, a space portion in which the pressure reducing valve 200 is installed and a space portion in which the plunger 300 is installed are formed on both sides. The valve body 100 is connected to both ends of the second flow path 150 at positions opposed to each other in the space where the plunger 300 is installed and the check valve 400 is installed A chamber 160 is formed.

The valve body 100 is provided with a drain port 170 for draining the fluid to the outside at a position where the pressure reducing valve 200 is installed. This allows the pressure between the left and right oscillating cylinders A and B in the pressure reducing valve 200 to be discharged outside when pressure is increased by an external force or other physical force.

The pressure reducing valve 200 can supply fluid to the left and right oscillating cylinders A and B by reducing the pressure of the fluid.

In detail, the pressure reducing valve 200 is installed in the valve body 100 and connected to the inlet port 110 to reduce the pressure of the fluid flowing through the inlet port 110, And the second flow path (150).

The pressure reducing valve 200 includes a cover 220 installed to penetrate the first passage 140 and a central portion of the second passage 150 and to communicate with the first passage 140 and the second passage 150, The first port 140 is installed inside the cover 220 and communicates with the inlet port 110 and is moved upward by the pressure of the fluid in the second flow path 150, And a spool (240) for blocking the flow of the fluid. A poppet 260 elastically supported by a spring is formed on the upper end of the spool 240. Thus, the internal pressure is adjusted by the spool 240, and the poppet 260 has a structure for maintaining the pressure by reducing the pressure by shutting off and discharging the pressure by opening and closing the valve to discharge the fluid to the drain port 170 . On the other hand, the pressure of the poppet 260 is adjusted by the setting of the adjusting screw 280.

The plunger 300 is provided at both ends of the first flow path 140 and communicates with the first flow path 140 so as to be operated forward and backward by the pressure of the fluid in the first flow path 140.

Here, the plunger 300 is installed across the first flow path 140 and the second flow path 150 and is moved forward and backward according to whether the fluid flows into the first flow path 140, (160).

The plunger 300 opens the check valve 400 by the advancing operation and closes the check valve 400 by the backward movement.

The check valve 400 is installed in the valve body 100 so as to be connected to the left discharge port 120 and the right discharge port 130 and is operated by forward movement of the plunger 300, And the fluid is supplied to the left and right oscillating cylinders A and B from the second flow path 150 by communicating the two flow paths with the left discharge port 120 and the right discharge port 130, .

The check valve 400 is installed in the chamber 160 to partition the front chamber 162 and the rear chamber 164 connected to the left and right discharge ports 120 and 130, A first dummy pit 420 which is moved forward and backward by the pressure of the fluid of the first dummy pit 420 to be opened at the time of backward movement, A second hopper pit 440 which is moved to the inside of the first hopper pit 420 by forward movement and has a front end opened and a spring 460 installed at an end of the second hopper pit 440 to move forward, .

Here, the front chamber 162 is formed with a stepped boundary so that its cross-sectional area is smaller than that of the rear chamber 164, and the first dummy pit 420 is moved forward and backward by the pressure difference of the fluid, And a leg portion 424 which is formed under the head portion 422 and in which an internal space is formed and in which a communication hole through which the fluid flows is formed, The second hollow fiber pit 440 is inserted into the through hole and is in contact with the plunger so as to be moved forward and backward. The head portion 442 is extended to the end of the head portion 442 A leg portion 444 which is in close contact with or spaced from a boundary between the through hole and the inner space of the first dummy pit 420 to communicate with the through hole and the inner space of the first dummy pit 420, ).

The reason why the check valve 400 is composed of the first and second dies 450 and 440 is that the first dies 450 are opened after the second dies 440 are opened So as to prevent a pressure shock caused by a sudden operation.

2 is a flow chart of the pressure supply of a locking valve for an excavator attitude control according to an embodiment of the present invention.

Referring to FIG. 2, when fluid is supplied to the inlet port 110, the plunger 300 is operated through the first flow path 150 through the pressure reducing valve 200 to open the first poppet 420, The second poppet 440 is opened by the opening of the first poppet 420 and supplies the fluid to the left and right oscillating cylinders A and B through the second flow path 150.

FIG. 3 is a flow chart of the hydraulic pressure when the set value of the pressure reducing valve of the excavator attitude control locking valve according to the embodiment of the present invention is reached.

3, the plunger 300 presses the check valve 400 to open the left and right oscillating cylinders A and B by continuously holding the unpressurized fluid pressure through the first flow path 140, The left and right oscillating cylinder lenders A and B are kept in close contact with each other so as not to be separated from the lower frame, and are balanced like a two-legged balance so as to move left or right in accordance with the load change of the excavator can do.

FIGS. 4 and 5 illustrate a fluid flow that maintains balance when overload is applied to either the left or right oscillating cylinder.

FIG. 4 is a flow chart of a hydraulic operation of the right side oscillating cylinder in a locking valve for an excavator attitude control according to an embodiment of the present invention.

4, when a load is applied to the right-hand oscillating cylinder B, fluid is supplied to the right-hand oscillating cylinder B through the second flow path 150 to the left-hand oscillating cylinder A, And the fluid pressure of the inlet port 110 becomes higher than the fluid pressure of the inlet port 110 so that the spool 240 of the pressure reducing valve 200 is raised and the fluid supply to the inlet port 110 is blocked.

The fluid in the right oscillating cylinder B lifts up the spool 240 through the second flow path 150 so that the poppet 260 is lifted in accordance with the rise of the spool 240, It is possible to discharge the fluid to the drain port 110 through the external cut surface of the drain port 110.

FIG. 5 is a flow chart of a hydraulic operation of a left oscillating cylinder in a locking valve for an excavator attitude control according to an embodiment of the present invention. FIG.

5, when a load is applied to the left-hand oscillating cylinder A, fluid is supplied to the left-hand oscillating cylinder A through the second flow path 150, And the fluid pressure of the inlet port 110 becomes higher than the fluid pressure of the inlet port 110 so that the spool 240 of the pressure reducing valve 200 is raised and the fluid supply to the inlet port 110 is blocked.

At this time, since the fluid of the left oscillating cylinder A rises the spool 240 through the second flow path 150, the poppet 260 is raised according to the rise of the spool 240, It is possible to discharge the fluid to the drain port 110 through the external cut surface of the drain port 110.

As described above, it can be seen that the present invention is based on providing a locking valve for an excavator attitude control as a basic technical idea. Within the scope of the basic idea of the present invention, Of course, many other variations are possible.

100: valve body 110: inlet port
120: Left discharge port 130: Right discharge port
140: first flow path 150: second flow path
160: chamber 162: front chamber
164: rear chamber 200: pressure reducing valve
220: Cover 240: Spool
300: plunger 400: check valve
420: first poppet 440: second poppet

Claims (5)

A locking valve for controlling the posture of the excavator body by controlling an oscillating cylinder installed on the left and right sides between the excavator body and the lower frame,
Wherein the locking valve comprises:
A first flow path communicating with the inlet port and formed therein with an inlet port through which fluid is injected, a left outlet port connected with the oscillating cylinder on the left, and a right outlet port connected with the oscillating cylinder on the right side, A valve body communicating with the inlet port and having a second flow path communicating with the left outlet port and the right outlet port, respectively;
A pressure reducing valve installed inside the valve body and connected to the inlet port to reduce the pressure of the introduced fluid and discharge the fluid to the first flow path and the second flow path;
A pair of plungers provided at both ends of the first flow path and communicating with the first flow path and operated forward and backward by the pressure of the fluid in the first flow path;
The valve body is connected to the left exhaust port and the right exhaust port and is operated by forward movement of the plunger so as to communicate with the second flow path and the left exhaust port and the right exhaust port, And a pair of check valves for allowing the fluid to be supplied to the left and right oscillating cylinders at two flow paths. The method according to claim 1,
At both ends of the second flow path,
Wherein a chamber in which the check valve is installed is formed in the chamber. 3. The method of claim 2,
The check valve
A first duct pit provided in the chamber to divide a front chamber and a rear chamber connected to the left and right discharge ports and to move forward and backward by the pressure of the fluid in the second flow path to be opened in reverse, A second hopper pit inserted into the first hopper pit at a front end thereof so as to protrude outward and to be opened into the first hopper pit by the forward movement of the plunger to open the front end thereof, And a spring for forward movement of the excavator. The method of claim 3,
Wherein the front chamber is formed with a stepped boundary so that its cross-sectional area is smaller than that of the rear chamber,
The first shroud pit may include a head portion which is moved forward and backward by a pressure difference of the fluid to be closely attached to or spaced from the boundary portion and has a through hole formed at an end thereof, And a leg portion formed with a communication hole through which the fluid flows,
Wherein the second hollow fiber pit is inserted into the through hole to be in contact with the plunger so as to be moved forward and backward, and a second hollow portion extending from the end of the head portion and being in close contact with a boundary between the through hole and the inner space of the first hollow fiber pit Or a leg portion which is separated from the through hole and communicated with the internal space of the first hollow fiber pit and has a communication hole at the outside thereof. The method according to claim 1,
The pressure-
A cover which is installed to penetrate through the first flow path and the second flow path central portion and communicate with the first flow path and the second flow path respectively, and a cover which is provided inside the cover and communicates with the inflow port, And a spool which is moved upward by pressure to close the inlet port and the first flow path to shut off the flow of the fluid.
KR2020170000595U 2017-02-03 2017-02-03 lacking valve of poclain KR200486065Y1 (en)

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KR2020170000595U KR200486065Y1 (en) 2017-02-03 2017-02-03 lacking valve of poclain

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07279906A (en) * 1994-03-31 1995-10-27 Kayaba Ind Co Ltd Hydraulic control
JP2552994Y2 (en) * 1989-12-05 1997-11-05 新キャタピラー三菱 株式会社 Horizontal control device for construction machinery
KR20080029358A (en) 2006-09-29 2008-04-03 현대중공업 주식회사 The upper frame structure changingmax digging height & depth in hydraulic excavato
KR20120016542A (en) * 2010-08-16 2012-02-24 국방과학연구소 Automatic shut valve for rapid transfer of flow in hydraulic cirrcuit
KR20130103303A (en) * 2010-05-17 2013-09-23 볼보 컨스트럭션 이큅먼트 에이비 Hydraulic pressure-regulating valve for construction equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2552994Y2 (en) * 1989-12-05 1997-11-05 新キャタピラー三菱 株式会社 Horizontal control device for construction machinery
JPH07279906A (en) * 1994-03-31 1995-10-27 Kayaba Ind Co Ltd Hydraulic control
KR20080029358A (en) 2006-09-29 2008-04-03 현대중공업 주식회사 The upper frame structure changingmax digging height & depth in hydraulic excavato
KR20130103303A (en) * 2010-05-17 2013-09-23 볼보 컨스트럭션 이큅먼트 에이비 Hydraulic pressure-regulating valve for construction equipment
KR20120016542A (en) * 2010-08-16 2012-02-24 국방과학연구소 Automatic shut valve for rapid transfer of flow in hydraulic cirrcuit

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