KR20140024575A - Hydraulic operating valve for front loader - Google Patents

Hydraulic operating valve for front loader Download PDF

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Publication number
KR20140024575A
KR20140024575A KR1020120090656A KR20120090656A KR20140024575A KR 20140024575 A KR20140024575 A KR 20140024575A KR 1020120090656 A KR1020120090656 A KR 1020120090656A KR 20120090656 A KR20120090656 A KR 20120090656A KR 20140024575 A KR20140024575 A KR 20140024575A
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South Korea
Prior art keywords
operation valve
oil
front loader
control valve
valve
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KR1020120090656A
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Korean (ko)
Inventor
코르기 이바노
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발보일플루이드파워코리아 유한회사
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Priority to KR1020120090656A priority Critical patent/KR20140024575A/en
Publication of KR20140024575A publication Critical patent/KR20140024575A/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
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/20—Off-Road Vehicles
    • B60Y2200/22—Agricultural vehicles
    • B60Y2200/221—Tractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

When another additional device is mounted on a work vehicle such as an agricultural tractor equipped with a front loader, a hydraulic operation valve for a front loader configured to operate another additional device independently of the front loader is disclosed.
Hydraulic operation valve for the front loader according to an embodiment of the present invention is configured to supply oil to one or more drive cylinders (C1, C2) provided in the front loader mounted on the work vehicle to drive the drive cylinder (C1, C2) A first operation valve 200 to operate; And a separate one or more drive cylinders C3 detachably connected to the first operation valve 200 and connected to the first operation valve 200 and provided in the additional device when another additional device is mounted on the work vehicle. A second operation valve 300 configured to supply oil to the at least one driving device to operate the at least one driving cylinder C3 provided in the additional device; As shown in FIG.
According to the configuration as described above, the present invention can be configured to operate other additional devices independently from the front loader when the other additional device is mounted on a work vehicle such as an agricultural tractor equipped with a front loader, the front loader is equipped with It may be easy to mount and use other additional devices in the work vehicle, and it may be possible to take less time and money to mount and use other additional devices in the work vehicle equipped with the front loader.

Figure P1020120090656

Description

HYDRAULIC OPERATING VALVE FOR FRONT LOADER}

The present invention relates to a hydraulic control valve for a front loader used to operate a front loader mounted on a work vehicle, such as an agricultural tractor, and more particularly, when another additional device is mounted on the work vehicle. The present invention relates to a hydraulic control valve for a front loader capable of operating other additional devices.

The front loader is provided in a work vehicle such as an agricultural tractor, and is used for a work such as moving a heavy object. This front loader includes a plurality of arms connected to the work vehicle and a bucket connected to the arms. In order to operate the arm and the bucket, the front loader includes two driving cylinders, one driving cylinder for operating the arm and the other driving cylinder for operating the bucket.

This drive cylinder is connected to a hydraulic control valve provided in the work vehicle. The hydraulic control valve is configured to operate the drive cylinder by hydraulic pressure. Accordingly, when the user operates the hydraulic control valve, the two drive cylinders are operated by the hydraulic pressure, thereby operating the arm and the bucket of the front loader to carry out operations such as moving heavy objects.

The hydraulic control valve is provided with two spools to be movable. In addition, the hydraulic control valve is connected to the oil pump and the oil tank. Then, the oil from the oil pump is supplied to each drive cylinder in accordance with the movement position in the hydraulic operation valve of each spool so that each drive cylinder is operated.

On the other hand, in addition to the front loader described above, a work vehicle such as an agricultural tractor may be equipped with other attachments such as, for example, tongs (not shown), forklifts (not shown), or graders (not shown). And, this additional device is provided with another drive cylinder for operating the additional device.

Conventionally, when using an additional device other than the front loader in the work vehicle in this way, there is a problem that must be replaced with another hydraulic control valve configured to operate the additional device in addition to the front loader.

That is, in addition to the two spools for operating the two drive cylinders provided in the front loader, another spool for operating the drive cylinders provided in the other additional device, a total of three spools must be replaced with a hydraulically operated valve that is movable. There is a problem.

Accordingly, there is a problem that the user must purchase and have a separate hydraulic control valve in order to use other additional devices in addition to the front loader. In addition, there is a problem that this operation is time-consuming and difficult for a general user who does not have expertise in the replacement of the hydraulic operation valve.

Therefore, in the related art, it is difficult and time-consuming and difficult to mount and use an additional device other than the front loader in a work vehicle such as an agricultural tractor.

The present invention is made by recognizing at least one of the needs or problems occurring in the conventional hydraulic control valve for the front loader as described above.

One aspect of the object of the present invention is to operate another additional device independently of the front loader when the other additional device is mounted on a work vehicle such as an agricultural tractor equipped with a front loader.

Another aspect of the object of the present invention is to facilitate the installation and use of other attachments in a work vehicle equipped with a front loader.

Another aspect of the object of the present invention is to reduce the time and cost of mounting and using other additional devices in the work vehicle equipped with a front loader.

A hydraulic operation valve for a front loader according to an embodiment for realizing at least one of the above problems may include the following features.

The present invention is basically based on the configuration in which other additional devices can be operated independently of the front loader when another additional device is mounted on a work vehicle such as an agricultural tractor on which the front loader is mounted.

Hydraulic operation valve for a front loader according to an embodiment of the present invention is configured to supply oil to at least one drive cylinder provided in the front loader mounted on the work vehicle to operate the first operation valve; And detachably connected to the first control valve, and when the other additional device is mounted on the work vehicle, oil is supplied to one or more separate driving cylinders connected to the first control valve and provided to the additional device. A second operation valve for operating one or more drive cylinders; As shown in FIG.

In this case, at least one of the first operation valve and the second operation valve may be provided with one or more spools configured to switch the movement path of the oil to be movable.

In addition, the one or more spools may be elastically supported by the elastic member.

In addition, the first operation valve may be connected to an oil pump and an oil tank.

In addition, at least one of the first operation valve and the second operation valve at least one supply passage configured to be connected to the oil pump; One or more discharge passages configured to be connected to the oil tank; At least one first oil channel configured to be connected to one side of the drive cylinder; And at least one second oil channel configured to be connected to the other side of the drive cylinder. Can be formed.

The one or more spools are movably provided in a movement hole formed in the first operation valve or the second operation valve, and the supply hole and the discharge passage, the first oil channel, and the second oil channel may be connected to the movement hole. .

In addition, the one or more spools may be formed with one or more connecting grooves that may be connected to at least one of the supply passage and the discharge passage, the first oil passage and the second oil passage according to the moving position of the spool.

In addition, the first operation valve may be provided with a safety valve connected to the supply passage and the discharge passage, and configured to discharge the oil into the oil tank when the oil pressure by the oil exceeds a predetermined pressure.

In addition, when the second operation valve is connected to the first operation valve, the supply passage of the first operation valve and the supply passage of the second operation valve, the discharge passage of the first operation valve and the discharge passage of the second operation valve so as to be connected. Can be configured.

In addition, the second operation valve may be provided with a solenoid to move the spool by electricity.

According to the embodiment of the present invention as described above, the first operation valve for operating one or more drive cylinders provided in the front loader, and detachably connected to the first operation valve and provided in other additional devices other than the front loader It is configured to include a second operation valve for operating one or more drive cylinders, it is possible to operate other additional devices independently of the front loader when the other additional device is mounted on a work vehicle equipped with a front loader.

Further, according to the embodiment of the present invention, it is easy to mount and use other additional apparatuses on the work vehicle equipped with the front loader.

In addition, according to the embodiment of the present invention, it is possible to reduce the time and cost to mount and use other additional devices in the work vehicle equipped with a front loader.

1 is a front perspective view of an embodiment of a hydraulic control valve for a front loader according to the present invention.
Figure 2 is a rear perspective view of one embodiment of a hydraulic control valve for the front loader according to the present invention.
3 is an exploded perspective view of the hydraulic control valve for the front loader according to the present invention.
4 is a planar cross section of FIG.
(A) is sectional drawing along the AA 'line of FIG. 1, (b) is sectional drawing along the BB' line of FIG.
6A and 6B are diagrams showing a hydraulic circuit of an embodiment of a hydraulic control valve for a front loader according to the present invention. FIG. 6A shows a case where only the first operation valve is used, and FIG. 6B is a view of the first operation valve and the first operation valve. The following shows the case where two control valves are used together.
7A and 7B show a hydraulic circuit of an embodiment of a front loader hydraulic control valve according to the present invention when connected to another front loader hydraulic control valve, and FIG. 7A is a case of using only the first control valve. Fig. 7B shows the case where the first operation valve and the second operation valve are used together.
8A to 9B are views showing the operation of one embodiment of the hydraulic control valve for the front loader according to the present invention, Figures 8A and 9A are a plan sectional view and Figures 8B and 9B are hydraulic circuit diagrams.

In order to help the understanding of the features of the present invention as described above, it will be described in more detail with respect to the hydraulic control valve for the front loader according to the embodiment of the present invention.

Hereinafter, exemplary embodiments will be described based on embodiments best suited for understanding the technical characteristics of the present invention, and the technical features of the present invention are not limited by the illustrated embodiments, It is to be understood that the present invention may be implemented as illustrated embodiments. Therefore, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. In order to facilitate understanding of the embodiments to be described below, in the reference numerals shown in the accompanying drawings, among the constituent elements which perform the same function in each embodiment, the related constituent elements are indicated by the same or an extension line number.

Embodiments related to the present invention are basically based on the configuration in which other additional devices can be operated independently of the front loader when another additional device is mounted on a work vehicle such as an agricultural tractor on which the front loader is mounted.

As shown in FIGS. 1 to 6b, the hydraulic control valve 100 for the front loader according to the present invention may include a first operation valve 200 and a second operation valve 300.

The first operation valve 200 is provided with one or more drive cylinders C1 and C2 provided in a front loader (not shown), for example, mounted on a work vehicle (not shown) such as an agricultural tractor. It can be configured to supply oil as shown in Figs. 8A-9B. Accordingly, the drive cylinders C1 and C2 can be operated as shown in Figs. 8A to 9B. And by this, the front loader can be operated.

1 to 6b, the hydraulic control valve 100 for the front loader drives one drive cylinder C1 for driving a bucket of the front loader and another for driving an arm of the front loader. It is configured to operate the driving cylinders C1 and C2 by supplying oil to one driving cylinder C2, that is, two driving cylinders C1 and C2 in total.

However, the number of the driving cylinders C1 and C2 operated by supplying oil by the first operation valve 200 is not limited to two, and may be any number such as one, three or more.

In order to supply oil to one or more drive cylinders C1 and C2 to operate the drive cylinders C1 and C2, the first operation valve 200 may include one or more spools (as shown in FIGS. 1 to 6B). 210 and 210 'may be provided to be movable. To this end, the first operation valve 200 may be formed with a moving hole (211, 211 ') as shown in the embodiment shown in FIG. In addition, the spools 210 and 210 'may be provided to be movable in the movement holes 211 and 211'.

In addition, the spools 210 and 210 'of the first operation valve 200 may be elastically supported by the elastic members 212, 212' and 214 as shown in FIGS. 4 and 5. Accordingly, elastic forces of the elastic members 212, 212 ′ and 214 may be applied to the spools 210 and 210 ′. By the elastic force by the elastic members 212,212 'and 214, the spools 210 and 210' may be in a neutral position as shown in FIGS. 4, 6A and 6B.

The spools 210 and 210 'of the first operation valve 200 may be configured to switch the moving path of the oil according to the moving position as shown in FIGS. 8A to 9B.

Accordingly, in the case of the hydraulic control valve 100 for the front loader of the embodiment shown in Figures 1 to 6b, oil is introduced into one side of the driving cylinder (C1, C2) as shown in Figure 8a and 8b The rod is discharged to the other side and the rods of the driving cylinders C1 and C2 are advanced, or as shown in FIGS. 9A and 9B, oil is introduced into the other side of the driving cylinders C1 and C2 and flows out to one side so that the driving cylinders C1, The rod of the drive cylinders C1 and C2 may be in a neutral position because the rod of C2) is reversed or oil is not introduced into the drive cylinders C1 and C2 as shown in FIGS. 4 and 6A and 6B. have. That is, the spools 210 and 210 'of the first operation valve 200 may have three operation positions.

On the other hand, in the embodiment shown in Figures 1 to 6b in the case of the spool 210 of the first operation valve 200, although not shown may be in other operating positions other than the three operating positions described above. That is, in the case of the spool 210 of the first operation valve 200 may be four operating positions.

To this end, the spool 210 of the first operation valve 200, in addition to the elastic member 212 to elastically support it as shown in the embodiment shown in Figures 4 and 5, the auxiliary spool member 213 and the auxiliary spool member ( An elastic member 214 for elastically supporting the 213 may be further provided. And, in addition to the three operating positions described above, in the operating position of the spool 210 of the first operation valve 200, the oil present in the driving cylinder C1 may flow out to the outside, for example, the oil tank T to be described later. have.

Accordingly, no oil is present in the driving cylinder C1, so that hydraulic pressure may not be applied. In addition, the bucket connected to the driving cylinder C1 may be operated by an external force other than the hydraulic pressure of the driving cylinder C1. This function allows the bucket to be operated, that is, rotated by the reaction force acting on the bucket by the barrier when passing an obstacle such as a barrier when the work vehicle such as an agricultural tractor equipped with a front loader moves. Can be used to

In order to move the spools 210 and 210 ', connection holes formed in the spools 210 and 210' are formed on the opposite side of the side on which the spools 210 and 210 'are elastically supported, that is, as shown in FIGS. 1, 3 and 4. A lever (not shown), a cable of a remote controller (not shown), a joystick, or the like may be connected. In addition, the spools 210 and 210 'may be configured to be moved by electricity.

In order to switch the movement path of the oil according to the movement position of the spools 210 and 210 ', the first operation valve 200 is the oil pump P and the oil tank T as shown in FIGS. 6A and 6B. ) Can be connected.

To this end, as shown in the embodiment shown in FIG. 2, the first operation valve 200 may be formed with a P port that can be connected to the oil pump (P) and a T port that can be connected to the oil tank (T). In addition, as shown in FIGS. 6A and 6B, a P1 port that may be connected to the oil pump P may be formed separately from the P port. Although not shown, a T1 port may be formed that may be connected to the oil tank T separately from the T port.

In addition, the first operation valve 200 includes one or more supply passages 251, one or more discharge passages 252, one or more first oil passages 253 and 253 ', as shown in the embodiments shown in FIGS. One or more second oil passages 254 and 254 'may be formed.

As shown in the embodiment shown in Figures 4 to 6b one or more supply passage 251 may be configured to be connected to the oil pump (P). To this end, the first operation valve 200 at one end of the supply passage 251 may be connected to the oil pump P as shown in FIG. 2, for example, by a connecting pipe (not shown). One P port can be formed. In addition, the supply passage 251 may be divided into various branches based on the P port as shown in the embodiment shown in FIGS.

One or more discharge passages 252 may be configured to be connected to the oil tank (T) as in the embodiment shown in Figures 4 to 6b. To this end, the first operation valve 200 at one end of the discharge passage 252, as shown in Figure 2, the above-described T port that can be connected to the oil tank (T), for example by a connecting pipe Can be formed. And, as shown in the embodiment shown in Figures 4 to 6b, the discharge passage 252 can also be divided into several branches around the T port.

In addition, the one or more first oil passages 253 and 253 'may be configured to be connected to one side of the driving cylinders C1 and C2. To this end, the first operation valve 200 at one end of the first oil passages 253 and 253 'may be connected to one side of the driving cylinders C1 and C2, for example, by a connecting pipe, as shown in FIG. A port (A1 port, A2 port in the illustrated embodiment) can be formed. In addition, the first oil paths 253 and 253 'may be divided into various branches about the A port (the A1 port and the A2 port in the illustrated embodiment) as shown in FIGS. 4 to 6B.

One or more second oil passages 254 and 254 'may be configured to be connected to the other side of the driving cylinders C1 and C2. To this end, the first operation valve 200 at one end of the second oil passage 254, 254 'is connected to the other side of the drive cylinders C1, C2, for example, by a connecting pipe, as shown in the embodiment shown in FIG. B port (B1 port, B2 port in the illustrated embodiment) can be formed. As shown in FIGS. 4 to 6B, the second oil flow paths 254 and 254 'may also be divided into various branches about the B port (B1 port and B2 port in the illustrated embodiment).

The supply passage 251, the discharge passage 252, the first oil passages 253, 253 ′, and the second oil passages 254, 254 ′ are provided with a first operation valve (as shown in FIGS. 4 and 5). It may be connected to the movement holes (211,211 ') formed in the 200. In addition, one or more connecting grooves 210a and 210a 'may be formed in the spools 210 and 210' as shown in FIGS. 4 and 5.

With this configuration, as shown in Figs. 4 to 6B and 8A to 9B, the respective connecting grooves 210a and 210a 'are formed in the spools 210 and 210' according to the moving positions of the spools 210 and 210 '. It may be connected to at least one of the flow path 251, the discharge flow path 252, the first oil flow path 253, and the second oil flow path 254.

Accordingly, when the spools 210 and 210 'are in the neutral position, as shown in FIGS. 4 to 6B, the supply passage 251 is directly connected to the discharge passage 252 so that the first oil pump P may be connected to the first passage. The oil supplied to the operation valve 200 may be discharged directly to the oil tank T without being supplied to the driving cylinders C1 and C2. In addition, since the driving cylinders C1 and C2 are not operated by this, the bucket and the arm of the front loader connected to the driving cylinders C1 and C2 may not be operated.

8A and 8B, when the spools 210 and 210 'are in the forward position, the supply passage 251 is driven to one side of the drive cylinders C1 and C2, that is, in the illustrated embodiment. It may be connected to the A1 port and the A2 port of the first control valve 200 connected to one side of the cylinder (C1, C2). The discharge passage 252 is connected to the B1 port and the B2 port of the first operation valve 200 connected to the other side of the driving cylinders C1 and C2, that is, the other side of the driving cylinders C1 and C2 in the illustrated embodiment. Can be.

Accordingly, oil is supplied to one side of the driving cylinders C1 and C2 by the oil pump P so that the rods of the driving cylinders C1 and C2 may be advanced as shown in FIGS. 8A and 8B. In addition, the oil existing in the driving cylinders C1 and C2 passes through the first operation valve 200 through the other side of the driving cylinders C1 and C2 as the rods of the driving cylinders C1 and C2 advance, and thus the oil tank ( Can be discharged to T). Thereby, the bucket or the arm connected to the drive cylinders C1 and C2 can be operated.

In addition, when the spools 210 and 210 'are in the retracted position, the supply passage 251 is connected to the other side of the drive cylinders C1 and C2, that is, the port B1 of the first operation valve 200 in the illustrated embodiment. It can be connected to the B2 port. In addition, the discharge passage 252 may be connected to one side of the driving cylinders C1 and C2, that is, the port A1 and port B1 of the first operation valve 200 in the illustrated embodiment.

Accordingly, the oil is supplied to the other side of the drive cylinders C1 and C2 by the oil pump P so that the rods of the drive cylinders C1 and C2 may be reversed as shown in FIG. 9B. In addition, the oil existing in the driving cylinders C1 and C2 passes through the first operation valve 200 through one side of the driving cylinders C1 and C2 as the back of the rods of the driving cylinders C1 and C2 pass through the oil tank ( Can be discharged to T). Thereby, the bucket or the arm connected to the drive cylinders C1 and C2 can be operated.

8A to 9B, when the external force acting on the spools 210 and 210 'is removed, the spools 210 and 210' are driven by the elastic force of the elastic members 212,212 'and 214 that elastically support the spools 210 and 210'. Is moved back to the neutral position as shown in Figs.

On the other hand, the first control valve 200 may be provided with a safety valve 220 as shown in the embodiment shown in Figures 4 and 6a and 6b. The safety valve 220 may be connected to the supply passage 251 and the discharge passage 252 as shown in the illustrated embodiment. Then, when the hydraulic pressure by the oil by the safety valve 220 is more than a predetermined pressure, the oil can be discharged to the oil tank (T) through the safety valve 220. Accordingly, it is possible to prevent breakage of the hydraulic control valve 100 for the front loader according to the present invention by the hydraulic pressure of a predetermined pressure or more.

4 to 6B, check valves 230 and 230 ′ may be connected to the supply passage 251. Accordingly, the oil supplied to the supply passage 251 through the oil pump P can be prevented from flowing back.

Such check valves 230 and 230 ′ may be provided above the first control valve 200 as shown in FIG. 5. With this configuration, the second operation valve 300 can be easily connected to the first operation valve 200 as will be described later. Further, the supply passage 251 of the first operation valve 200 and the supply passage 351 of the second operation valve 300, the discharge passage 252 of the second operation valve 300 and the second operation valve ( The discharge passage 352 of 300 may be easily connected.

4 through 6b, the supply channel 251 of the first control valve 200 and the supply channel of the discharge channel 252 and the second control valve 300 are provided in the first operation valve 200. A connection passage 255 connected to at least one of the 351 and the discharge passage 352 may be formed.

The connection passage 255 may be connected to the other hydraulic control valve 100 for the front loader. To this end, the first operation valve 200 at one end of the connection passage 255, as shown in the embodiment shown in Figs. 4 to 6b, for example, P of the hydraulic control valve 100 for the front loader different by the connecting pipe. A C port can be formed that can be connected to the port.

In addition, the first operation valve 200 is provided with a first closing plug 270 (not shown using a dotted line as shown in FIG. 4) or a second closing plug 280 as shown in FIG. 4. May be The second closing plug 280 may be formed with a through hole 281 penetrating the same as shown in the illustrated embodiment.

As shown in FIG. 6A, when only the first operation valve 200 is used and the C port of the first operation valve 200 is not used, the second operation valve 300 to be described later is used. Both the first plug plug 270 and the second plug plug 280 are not used. Accordingly, as shown in FIG. 6A, the oil flowing through the supply passage 251 of the first control valve 200 at the neutral position of the spools 210 and 210 ′ is connected to the C port of the first control valve 200. Instead of flowing into the flow path 255, the flow path may flow into the discharge flow path 252 connected to the T port of the first operation valve 200 to be discharged into the oil tank T.

6B, when the second operation valve 300 is connected to the first operation valve 200 and the C port of the first operation valve 200 is not used, the second operation valve 200 is used. The supply passage 251 so that the closing plug 280 is not connected to the discharge passage 252 connected to the T port of the first operation valve 200 and the connection passage 255 connected to the C port of the first operation valve 200. It may be provided in.

Accordingly, as shown in FIG. 6B, the oil flowing through the supply passage 251 of the first operation valve 200 at the neutral position of the spools 210 and 210 ′ is connected to the C port of the first operation valve 200. Rather than flowing into the flow path 255, the through-hole 281 (see FIG. 4) formed in the second closing plug 280 may flow into the supply flow path 351 of the second operation valve 300 to be described later. As such, the oil flowing through the supply passage 351 of the second operation valve 300 is the discharge passage 352 of the second operation valve 300 and the discharge passage connected to the T port of the first operation valve 200. Flow 252 may be discharged to the oil tank (T).

In addition, in the case of using only the first operation valve 200 and the C port of the first operation valve 200 without using the second operation valve 300 to be described later, as shown in the embodiment shown in FIG. 7A, The first closing plug 270 may be provided such that the discharge passage 252 connected to the T port of the first manipulation valve 200 and the supply passage 251 of the first manipulation valve 200 are not connected to each other.

Accordingly, as shown in FIG. 7A, the oil flowing through the supply passage 251 of the first operation valve 200 at the neutral position of the spools 210 and 210 ′ is discharged connected to the T port of the first operation valve 200. Instead of flowing into the flow path 252, the flow path may flow into the connection flow path 255 connected to the C port of the first operation valve 200.

In addition, when the second operation valve 300 is connected to the first operation valve 200 and the C port of the first operation valve 200 is used as in the embodiment shown in FIG. 7B, the first closure is performed. Both the plug 270 and the second closing plug 280 may be provided in the first operation valve 200.

Accordingly, as shown in FIG. 7B, the oil flowing through the supply passage 251 of the first operation valve 200 at the neutral positions of the spools 210 and 210 ′ is formed through the through holes 281 and the second closing plug 280. 4) may flow to the supply passage 351 of the second operation valve 300. As such, the oil flowing through the supply passage 351 of the second operation valve 300 is connected to the discharge passage 352 of the second operation valve 300 and the connection port connected to the C port of the first operation valve 200. Flow to 255 may be introduced into the P port of the other hydraulic control valve 100 for the front loader.

The second control valve 300 may be detachably connected to the first control valve 200.

The second operation valve 300 is a first operation in addition to the front loader when, for example, other attachments such as tongs (not shown), fork feet (not shown), or graders (not shown) are mounted on the work vehicle. It may be connected to the valve 200. However, when no additional device other than the front loader is mounted on the work vehicle, the second operation valve 300 may not be connected to the first operation valve 200. That is, the second operation valve 300 may be connected to the first operation valve 200 only when another additional device is mounted on the work vehicle and uses another additional device in addition to the front loader.

In addition, the second operation valve 300 may be configured such that oil is supplied to at least one driving cylinder C3 provided in the additional device when an additional device other than the front loader is mounted on the work vehicle. Accordingly, the additional device may be operated by operating one or more drive cylinders C3 provided in the additional device.

With this arrangement, when the attachment is mounted on the work vehicle, it is possible to operate another attachment independently of the front loader.

In addition to the hydraulic control valve configured to operate only the front loader as in the related art, it is not necessary to separately purchase another hydraulic control valve configured to operate the additional device together with the front loader.

That is, when only the front loader is to be operated, only the first operation valve 200 may be used, and when the auxiliary device is to be operated together with the front loader, the second operation valve 300 may be connected to the first operation valve 200. ) Can be used by connecting.

Therefore, it is easy to use another attachment to the work vehicle equipped with the front loader.

In addition, since only the second operation valve 300 is connected to the first operation valve 200 without replacing the entire hydraulic operation valve 100, there is no expertise in replacing the hydraulic operation valve 100. The general user can also facilitate the use of other attachments in the work vehicle equipped with the front loader.

In addition, it is possible to reduce the time and cost to use the other additional equipment mounted on the work vehicle equipped with a front loader.

In the embodiment shown in FIG. 6B, the number of driving cylinders C3 operated by the second operation valve 300 is one. However, the number of the driving cylinders C3 operated by the second operation valve 300 is not limited thereto, and a plurality of driving cylinders C3 may be provided.

In order to supply oil to one or more driving cylinders C3 and operate the second operation valve 300, one or more spools 310 may be provided to be movable as in the embodiment illustrated in FIGS. 4 to 6B. . For this purpose, the second operation valve 300 is provided with a moving hole 311 as shown in the illustrated embodiment and the spool 310 of the second operating valve 300 is provided to be movable in the moving hole 311. Can be.

In addition, the spool 310 of the second operation valve 200 may be elastically supported by the elastic member 312 as shown in FIGS. 4 to 6b. Accordingly, the elastic force of the elastic member 312 may act on the spool 310 of the second operation valve 300. By the elastic force by the elastic member 312, as shown in Figures 4 and 6b it is possible to make the spool 310 in the neutral position.

The spool 310 of the second operation valve 300 may be configured to switch the moving path of the oil according to the moving position as shown in Figure 8a to 9b.

Accordingly, in the case of the hydraulic control valve 100 for the front loader of the embodiment shown in Figures 1 to 6b, oil is introduced into one side of the drive cylinder (C3) and the other side as shown in Figure 8a and 8b When the flow of the driving cylinder C3 is advanced to move forward, or as shown in FIGS. 9A and 9B, oil flows into the other side of the driving cylinder C3 and flows out to one side, so that the load of the driving cylinder C3 is reversed. Alternatively, as shown in FIGS. 4, 6A, and 6B, oil does not flow into the driving cylinder C3 so that the rod of the driving cylinder C3 may be in a neutral position. That is, the spool 310 of the second operation valve 300 may have three operating positions.

In order to move the spool 310 of the second operation valve 300, the solenoid 330 may be provided in the second operation valve 300 as shown in FIG. 4. As shown in FIG. 4, the solenoid 330 may be provided in the second operation valve 300 to be connected to one end and the other end of the spool 310, respectively.

Accordingly, the spool 310 of the second operation valve 300 may be moved by electricity. That is, when electricity is applied to the solenoid 330 of the second control valve 300, the spool 310 of the second control valve 300 is an elastic member according to the magnetic force generated by the electricity applied to the solenoid 330. The elastic force of 312 can be overcome and moved. However, in addition to the spool 310 of the second control valve 300, a lever or a cable of a remote controller or a joystick may be connected.

In order to switch the movement path of the oil according to the movement position of the spool 310 of the second operation valve 300, the second operation valve 300 has at least one supply passage 351 and at least one discharge passage 352 ), One or more first oil passages 353 and one or more second oil passages 354 may be formed.

6B and 7B, when the second operation valve 300 is connected to the first operation valve 200, the supply flow path 251 and the second operation valve of the first operation valve 200 ( The supply passage 351 of the 300 and the discharge passage 252 of the first operation valve 200 and the discharge passage 352 of the second operation valve 300 may be connected.

For example, as shown in FIG. 3, a connection surface on which one or more supply passages 251 and one or more discharge passages 252 are exposed is formed on one surface of the first operation valve 200, and correspondingly the second A connection surface on which one or more supply passages 351 and one or more discharge passages 352 are exposed may also be formed on one surface of the operation valve 300.

The second operation valve 300 is connected to the first operation valve 200 such that the connection surface of the first operation valve 200 and the connection surface of the second operation valve 300 contact each other, for example, in FIGS. 1 and 2. As shown in the illustrated embodiment, the connection may be made using a bolt or the like. For example, a sealing member such as an O-ring or the like may be formed in a portion where one or more supply passages 251 and 351 or one or more discharge passages 252 and 352 of each connection surface of the first operation valve 200 and the second operation valve 300 are exposed. May be provided).

Accordingly, when the second operation valve 300 is connected to the first operation valve 200, the supply passage 251 of the first operation valve 200 and the supply passage 351 of the second operation valve 300 and The discharge passage 252 of the first operation valve 200 and the discharge passage 352 of the second operation valve 300 may be connected without leakage.

As a result, one or more supply passages 351 of the second operation valve 300 may be connected to the oil pump P through the one or more supply passages 251 of the first operation valve 200, and the second operation valves. One or more discharge passages 352 of 300 may be connected to the oil tank T through the discharge passage 252 of the first operation valve 200. Then, the oil may be supplied to the second control valve 300 through the first control valve 200 by the oil pump (P), the oil present in the second control valve 300 is the first control valve ( 200 may be discharged to the oil tank (T).

In addition, one or more first oil passages 353 of the second operation valve 300 may be configured to be connected to one side of the driving cylinder C3. To this end, the second operation valve 300 at one end of the first oil passage 353 is connected to one side of the driving cylinder C3, for example, an A port (in the embodiment shown in FIG. 2). A3 port) can be formed. The first oil passage 353 may also be divided into various branches, as shown in FIGS. 4 and 6, with respect to the A port (the A3 port in the embodiment shown in FIG. 2).

One or more second oil passages 354 of the second operation valve 300 may be configured to be connected to the other side of the driving cylinder C3. To this end, the second operation valve 300 at the other end of the second oil passage 354 is connected to the other side of the driving cylinder C3, for example, a B port (in the embodiment shown in FIG. 2). B3 port) can be formed. In addition, the second oil channel 354 may also be divided into various branches, as shown in FIGS. 4 and 6, with respect to the B port (B3 port in the embodiment shown in FIG. 2).

The supply passage 351, the discharge passage 352, the first oil passage 353, and the second oil passage 354 of the second operation valve 300 are as shown in FIGS. 4 to 6B. It may be connected to the movement hole 311 formed in the second operation valve (300). In addition, one or more connection grooves 310a may be formed in the spool 310 of the second operation valve 300 as shown in FIGS. 4 and 5.

With this configuration, as shown in FIGS. 4 to 6B and 8A to 9B, each of the connecting grooves 310a formed in the spool 310 according to the moving position of the spool 310 is provided with the supply passage 351. The discharge passage 352, the first oil passage 353, and the second oil passage 354 may be connected to at least one.

Accordingly, when the spool 310 is in the neutral position as shown in FIGS. 4 to 6B, the second operation valve is supplied from the supply passage 251 of the first operation valve 200 by the oil pump P. FIG. The oil supplied to the supply passage 351 of the 300 is not supplied to the driving cylinder C3, but the discharge passage 352 of the second operation valve 300 and the discharge passage 252 of the first operation valve 200. It can be discharged to the oil tank (T) through. As a result, since the driving cylinder C3 is not operated, the additional device connected to the driving cylinder C3 may not be operated.

8A and 8B, when the spool 310 moves and is in the forward position, the supply passage 351 of the second operation valve 300 is one side of the driving cylinder C3, that is, illustrated. In one embodiment, it may be connected to the A3 port of the second operation valve 300 connected to one side of the driving cylinder C3. In addition, the discharge passage 352 may be connected to the B3 port of the second operation valve 300 connected to the other side of the driving cylinder C3, that is, the other side of the driving cylinder C3 in the illustrated embodiment.

Accordingly, the oil flowing from the supply passage 251 of the first operation valve 200 to the supply passage 351 of the second operation valve 300 by the oil pump P is connected to one side of the driving cylinder C3. The supplied rod of drive cylinder C3 can be advanced as shown in Figs. 8A and 8B. In addition, the oil existing in the driving cylinder C3 flows through the other side of the driving cylinder C3 as the rod of the driving cylinder C3 flows through the discharge passage 352 of the second operating valve 300 and the first operating valve. It may be discharged to the oil tank (T) via the discharge passage 251 of the (200). Thereby, the additional device connected to the drive cylinder C3 can be operated.

9A and 9B, when the spool 310 of the second operation valve 300 is moved to the backward position, the supply flow path 351 of the second operation valve 300 is the driving cylinder. The other side of (C3), that is, in the illustrated embodiment may be connected to the B3 port of the second control valve (300). In addition, the discharge passage 352 of the second operation valve 300 may be connected to one side of the driving cylinder C3, that is, the port A3 of the second operation valve 300 in the illustrated embodiment.

Accordingly, the oil flowing from the supply passage 251 of the first operation valve 200 to the supply passage 351 of the second operation valve 300 by the oil pump P is transferred to the other side of the driving cylinder C3. The supplied rod of the drive cylinder C3 can be reversed as shown in Figs. 9A and 9B. In addition, the oil existing in the driving cylinder C3 is discharged through the one side of the driving cylinder C3 as the back of the rod of the driving cylinder C3 flows 352 of the second operation valve 300 and the first flow path. It may be discharged to the oil tank (T) via the discharge passage 251 of the operation valve (200). Thereby, the additional device connected to the drive cylinder C3 can be operated.

On the other hand, in the state shown in Figure 8a to 9b, when the external force acting on the spool 310 of the second control valve 300, the elasticity to elastically support the spool 310 of the second control valve 300 By the elastic force of the member 312, the spool 310 of the second operation valve 300 is moved back to the neutral position as shown in Figs.

4 to 6B, the check valve 320 may be connected to the supply passage 351 of the second operation valve 300. Accordingly, the oil supplied to the supply passage 351 of the second operation valve 300 through the supply passage 251 of the first operation valve 200 through the oil pump P can be prevented from flowing back. .

As described above, when the hydraulic control valve for the front loader according to the present invention is used, when the other additional device is mounted on a work vehicle such as an agricultural tractor equipped with the front loader, it is possible to operate another additional device independently of the front loader. It is possible to facilitate the use of other attachments on the work vehicle equipped with the front loader, and the use of other attachments on the work vehicle equipped with the front loader takes less time and money. You can do that.

The above-described hydraulic control valve for the front loader is not limited to the configuration of the above-described embodiment, but the embodiments are configured by selectively combining all or some of the embodiments so that various modifications can be made. May be

100: hydraulic control valve for the front loader 200: the first control valve
210,210 ', 310: Spool 210a, 210a', 310a: Connecting groove
211,211'311: Moving hole 212,212 ', 214,312: Elastic member
213: auxiliary spool member 220: safety valve
230,230 ', 320: Check valve 251,351: Supply passage
252,352: Exhaust Euro 253,253 ', 353: First Oil Euro
254,254 ', 354: 2nd oil euro 255: connection euro
270: the first closed plug 280: the second closed plug
281 through hole 300 second operation valve
330: solenoid C1, C2, C3: driving cylinder
P: Oil Pump T: Oil Tank

Claims (10)

A first operation valve (200) configured to supply oil to at least one driving cylinder (C1, C2) provided in the front loader mounted to the work vehicle to operate the driving cylinders (C1, C2); And
One or more separate driving cylinders C3 detachably connected to the first control valve 200 and connected to the first control valve 200 and provided in the additional device when another additional device is mounted to the work vehicle. A second operation valve 300 configured to supply oil to the at least one driving cylinder C3 provided in the additional device;
Hydraulic operation valve for front loader configured to include. According to claim 1, wherein at least one of the first control valve 200 and the second control valve 300 is provided with at least one spool (210, 210 ', 310) configured to switch the movement path of the oil is movable Hydraulic control valve for front loader. 3. The hydraulic control valve of claim 2, wherein the at least one spool (210, 210 ', 310) is elastically supported by elastic members (212, 212', 214, 312). 3. The hydraulic control valve for a front loader according to claim 2, wherein the first control valve is connected to an oil pump and an oil tank. The method of claim 4, wherein at least one of the first control valve 200 and the second control valve (300)
One or more supply passages 251 and 351 configured to be connected to the oil pump P;
One or more discharge passages 252 and 352 configured to be connected to the oil tank T;
One or more first oil passages 253, 253 ', and 353 configured to be connected to one side of the driving cylinders C1, C2, and C3; And
One or more second oil passages (254, 254 ', 354) configured to be connected to the other side of the driving cylinders (C1, C2, C3);
Hydraulic operation valve for front loader, characterized in that is formed. The method of claim 5, wherein the one or more spools (210, 210 ', 310) are provided to be movable in the movement holes (211,211', 311) formed in the first control valve 200 or the second control valve 300,
The supply holes 251, 351, the discharge passages 252, 352, the first oil passages 253, 253 ′, 353, and the second oil passages 254, 254 ′, 354 are connected to the moving holes 211, 211 ′, 311. Hydraulic control valve for front loader. According to claim 5, wherein the one or more spools (210, 210 ', 310) according to the movement position of the spools (210, 210', 310), the supply passage (251,351) and the discharge passage (252,352), the first oil passage (253,253 ' 353) and one or more connecting grooves 210a, 210a ', and 310a, which may be connected to at least one of the second oil passages 254, 254' and 354, are formed. The method of claim 5, wherein the first operation valve 200 is connected to the supply passage 251 and the discharge passage 252, so that the oil is discharged to the oil tank (T) when the hydraulic pressure by the oil is above a predetermined pressure Hydraulic operation valve for front loader, characterized in that the safety valve 220 is configured. According to claim 5, When the second control valve 300 is connected to the first control valve 200,
Supply flow path 251 of the first control valve 200, supply flow path 351 of the second control valve 300, discharge flow path 252 and the second control valve of the first control valve 200. A hydraulic operation valve for the front loader, characterized in that configured to be connected to the discharge passage 352 of (300). The hydraulic control valve for a front loader according to claim 2, wherein the second operation valve (300) is provided with a solenoid (330) such that the spool (310) is moved by electricity.
KR1020120090656A 2012-08-20 2012-08-20 Hydraulic operating valve for front loader KR20140024575A (en)

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KR1020120090656A KR20140024575A (en) 2012-08-20 2012-08-20 Hydraulic operating valve for front loader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120090656A KR20140024575A (en) 2012-08-20 2012-08-20 Hydraulic operating valve for front loader

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101884817B1 (en) 2017-11-17 2018-08-13 발보일플루이드파워코리아 유한회사 Hydraulic valve for front loader
KR102439116B1 (en) 2022-04-08 2022-09-01 주식회사 득인기공 oil pressure valve for tractor
KR20230005449A (en) 2021-07-01 2023-01-10 발보일플루이드파워코리아 유한회사 Hydraulic operating valve for working machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101884817B1 (en) 2017-11-17 2018-08-13 발보일플루이드파워코리아 유한회사 Hydraulic valve for front loader
KR20230005449A (en) 2021-07-01 2023-01-10 발보일플루이드파워코리아 유한회사 Hydraulic operating valve for working machine
KR102439116B1 (en) 2022-04-08 2022-09-01 주식회사 득인기공 oil pressure valve for tractor

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