JPH0630909Y2 - Multiple check valve device for outrigger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is provided in a construction machine such as a wheel type hydraulic crane, and is suitable for use in left and right hydraulic circuits for outriggers, and is a multiple check valve device for outriggers. Regarding

[Conventional technology]

Generally, in construction machines such as wheel-type hydraulic excavators and wheel-type hydraulic cranes, the front and rear wheels can drive on the road, but at the time of stationary work, the total work load acts on the wheels, etc., resulting in stability during work. Therefore, a vehicle body holding mechanism called an outrigger is installed on the undercarriage with front and rear wheels, and during stationary work, this outrigger is hydraulically operated to overhang the undercarriage and the like. The body such as the body is supported on the road.

A pair of left and right outriggers are provided on the vehicle body such as the undercarriage, and the left and right outrigger cylinder hydraulic circuits that operate the outriggers are located, for example, between the hydraulic power source and the outrigger cylinders. Is provided with a check valve device for outriggers, which prevents the left and right outrigger cylinders from unintentionally expanding and contracting during work or traveling on the road, and places each outrigger in a working position (extended position). And the traveling position (storage position) are selectively retained.

Here, this kind of outrigger check valve device is generally a casing, a pair of hydraulic pressure source side ports formed on one side of the casing, and a rod side oil chamber of the outrigger cylinder formed on the other side of the casing. And a pair of actuator-side ports connected to the bottom-side oil chamber and the actuator-side ports and the hydraulic-pressure-source-side ports in order to communicate and cut off the actuator-side ports and the hydraulic-pressure-source-side ports. A pair of check valve bodies located between the check valve bodies and facing each other in the casing, and each of the check valve bodies for opening the other when one of the check valve bodies is opened. It is composed of a piston that is located between and is slidably provided in the casing, and is known as a so-called double operate check valve.

In the left and right independent outriggers that independently operate the left and right outrigger cylinders, two hydraulic power sources are separately used for the left and right outrigger cylinders, and the outrigger check valve is used for each hydraulic system. A device is provided, and a directional control valve (control valve), rotary joint (center joint), etc. are also used independently.

Further, in a left-right interlocking type outrigger that operates the left and right outrigger cylinders in conjunction with each other, only one hydraulic pressure source is used for the left and right outrigger cylinders, and a diversion pipe or the like is separately used for the outrigger check valve. It is designed to be continuous with the device.

[Problems to be solved by the device]

By the way, the recent trend is that the market needs are diversifying, and there are customers who want left and right interlocking outriggers and customers who want left and right independent outriggers, and a check valve device for outriggers that can be commonly used by both is required. Has been.

However, in the above-described conventional technology, when the left-right independent type is modified to the interlocking type or the interlocking type is modified to the independent type, it is necessary to set the hydraulic power source to one system or two systems. Therefore, it is necessary to drastically change the hydraulic circuit, and there is a drawback that workability during piping is extremely poor.

Further, the rotary joint and the like need to form two lines of pipes in the case of the independent type, and only one line in the case of the interlocking type.
It is necessary to shut off the remaining one system by using a plug, etc., and it is not possible to effectively use a large-sized rotary joint for the two systems, but the number of parts also increases, resulting in high cost. There is.

The present invention has been made in view of the above-mentioned drawbacks of the prior art.The present invention can be commonly used by simply modifying the left and right interlocking outriggers and the left and right independent outriggers to improve workability during piping. The present invention provides a multiple check valve device for an outrigger that can be significantly improved.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention provides a casing, first, second, third and fourth hydraulic pressure source side ports respectively formed on one side of the casing and another side of the casing. First, second, third, and fourth actuator-side ports that are formed and are connected to the rod-side oil chamber and the bottom-side oil chamber of the left and right outrigger cylinders, respectively.
In order to connect and disconnect the first, second, third and fourth actuator side ports and the first, second, third and fourth hydraulic side ports, respectively, Which of the first, second, third and fourth check valve bodies is provided between the respective hydraulic power source side ports and is provided in the casing, and among the first and second check valve bodies A pair slidably provided in the casing so that the other one is opened when one valve is opened, and the other one is opened when one of the third and fourth check valve bodies is opened. And the first hydraulic pressure source side port are communicated with the third hydraulic pressure source side port, and the second hydraulic pressure source side port is communicated with the fourth hydraulic pressure source side port. The structure is composed of a pair of communication passages.

When the multiple check valve device is used for a left-right interlocking type outrigger, a pair of lids for closing the hydraulic pressure source side ports may be detachably provided on the third and fourth hydraulic pressure source side ports. In addition, when used for the left and right independent outriggers, a pair of plugs for blocking the communication passages may be detachably provided in the communication passages.

[Action]

With the above configuration, in the case of the left-right interlocking type, by closing the third and fourth hydraulic pressure source side ports and connecting the first and second hydraulic pressure source side ports to the hydraulic pressure source, The pressure oil can be supplied to and discharged from the first and second hydraulic pressure source side ports, and can also be supplied to and discharged from the third and fourth hydraulic pressure source side ports by dividing the pressure oil through each communication passage. The cylinders can be operated together. Further, in the case of the left and right independent type, a single hydraulic pressure source is connected to the first, second, third and fourth hydraulic pressure source side ports, for example, via a directional switching valve, etc., with each communication passage blocked. If the pressure oil from the hydraulic pressure source is independently supplied to and discharged from the first and second hydraulic pressure source side ports and the third and fourth hydraulic pressure source side ports, the left and right outrigger cylinders Can be operated independently.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

1 to 7 show a first embodiment of the present invention.

In the figure, reference numeral 1 denotes a casing which constitutes the main body of the check valve device, and the casing 1 is formed in a substantially rectangular block shape, and one side thereof is provided in left, right, up and down directions as shown in FIGS. First, second, third and fourth hydraulic pressure source side ports 2A, 2B, 3A and 3B are formed separately from each other. Also, on the other side of the casing 1, a second
As shown in FIGS. 5 and 5, the first, second, third, and fourth actuator-side ports 4A, 4B are separated from each other in the left-right direction and the upper-lower direction.
5A, 5B are formed and the ports 4A, 4B, 5A, 5 are formed.
B is connected to rod-side oil chambers 25A and 26A and bottom-side oil chambers 25B and 26B of outrigger cylinders 25 and 26, respectively, which will be described later (see FIG. 7).

6, 6 are ports 2A, 2B, 3A, 3B and ports 4A,
4B, 5A, 5B, and a pair of upper and lower stepped holes formed in the casing 1 so as to extend in a direction orthogonal to these, and each stepped hole 6 is shown in FIG. As shown in
The left and right sides have large-diameter valve mounting portions 6A and 6B, and the axially intermediate portion has a small-diameter piston sliding hole 6C. Each piston 14 described below is inserted into the piston sliding hole 6C of each stepped hole 6, and each valve mounting portion 6A, 5B has a port 2A, 2B, 3A, 3B and a port 4A, 4B, 5A. 5
It has a structure for communicating with B.

Reference numeral 7 denotes a stepped tubular valve holding member screwed into the valve mounting portions 6A and 6B of the stepped holes 6, and each valve holding member 7 has a valve seat 8 at its tip end. Are formed and oil holes 9, 9, ... Always communicating with the ports 4A, 4B, 5A, 5B are bored in the peripheral wall portion thereof in the radial direction. 10, 1
0, ... are lids screwed to the base end side of each valve holding member 7, 1
Reference numerals 1A, 11B, 12A, and 12B denote first, second, third, and fourth check valve bodies slidably inserted into the respective valve holding members 7, and the check valve bodies 11A, 11B, and 12A. ，
12B and the respective lids 10 are provided with springs 13 and 1 respectively.
, ... are arranged, and the check valve bodies 11A, 11B, 1 are arranged.
The ports 2A and 12B communicate with and block the ports 2A, 2B, 3A and 3B and the ports 4A, 4B, 5A and 5B, respectively.

Reference numerals 14 and 14 denote a pair of upper and lower pistons slidably inserted into the piston sliding holes 6C of the stepped holes 6, respectively, and projecting portions 14A and 14B are provided on both axial ends of the pistons 14, respectively. The protrusions 14A, 14B are provided with check valve bodies 11B, 12B when the piston 14 slides to the right or left in FIG. 5 by the pressure oil from the ports 2A, 3A or 2B, 3B. Alternatively, the valve is forcibly opened by contacting 11A and 12A. That is, when the pressure oil from the hydraulic pressure source is supplied to the ports 2A and 3A and the check valve bodies 11A and 12A are opened by the oil pressure at this time, the ports 2B and 3B are opened from the ports 4B and 5B.
Side check valves 11B, 12 to discharge pressure oil to the side
B is forcibly opened by the piston 14, and in the opposite case, the check valves 11A and 12A are opened.

Reference numerals 15A and 15B denote a pair of left and right communication passages vertically formed in the casing 1 so as to communicate between the ports 2A and 2B and the ports 3A and 3B which are separated from each other at the upper and lower sides. The upper ends of 15A and 15B are lids 16A and 16B.
It is always closed by a screw hole 17A, 17B for screwing a later-described plug 19A, 19B in its axially intermediate portion.
Are formed. 18A and 18B are ports 3A and 3B
A pair of lids that are detachably screwed to the
A and 18B close ports 3A and 3B when the check valve device is used for a left and right interlocking type outrigger, and are removed when the check valve device is a left and right independent type (see FIG. 6).

19A and 19B are screw holes 17 of the communication passages 15A and 15B.
A pair of plugs detachably screwed to A and 17B are shown. The plugs 19A and 19B are communication passages 19A and 1B when the check valve device is used for left and right independent outriggers.
9B is shut off as shown in FIG. 6, and in the case of the left-right interlocking type, it is removed from the inside of the casing 1 as shown in FIGS. 4 and 5. Further, reference numerals 20, 20, ... Denote three mounting holes formed vertically in the casing 1, and bolts (not shown) or the like are inserted into the respective mounting holes 20,
For example, the casing 1 is fixed to a frame of a lower traveling body of a wheel type hydraulic excavator.

Next, FIG. 7 shows a case where the check valve device configured as described above is applied to a hydraulic circuit for a left-right interlocking type outrigger.

In the figure, reference numerals 21 and 22 denote hydraulic pumps driven by a prime mover (not shown), the hydraulic pump 21 serves as a main hydraulic pump and constitutes a hydraulic source with a tank 23, and the hydraulic pump 22 serves as an auxiliary pump. Become pilot conduit 24
Pilot pressure is supplied inside. 25,
Reference numeral 26 denotes left and right outrigger cylinders. The cylinders 25 and 26 have rod-side oil chambers 25A and 26A and bottom-side oil chambers 25B and 26B defined by pistons 25D and 26D in tubes 25C and 26C, respectively. Chamber 25A, 2
5B, 26A, 26B are connected to the ports 4A, 4B, 5A, 5B of the check valve device (casing 1) via conduits 27A, 27B, 28A, 28B, respectively. The cylinders 25 and 26 are arranged in the oil chambers 25A and 25A.
B, 26A and 26B are supplied with and discharged from the hydraulic pump 21 to expand and contract the rods 25E and 26E, and the left and right outriggers (not shown) are extended from the undercarriage or housed in the undercarriage. It is supposed to do.

29A and 29B are a pair of main pipes connecting the ports 2A and 2B of the casing 1 to the hydraulic pump 21 and the tank 23, and 30 is a directional valve as a control valve provided in the middle of the main pipes 29A and 29B. The directional switching valve 30 is switched from the neutral position (a) to the left and right switching positions (b) and (c) by an operating lever 30A provided in a driver's cab (not shown) of the upper swing body. 31A, 3
Reference numeral 1B denotes a pair of left and right ram cylinders. The ram cylinders 31A and 31B are connected to branch conduits 32A and 32B that are provided at the tip end side of the tank conduit 32, for example, a chassis and a front of a lower traveling body. It is arranged between an axle (neither is shown).

Reference numerals 33A and 33B denote a pair of left and right check valves provided in the middle of the branch pipelines 32A and 32B. The check valves 33A and 33B are connected to the tip end side of the pilot pipeline 24 and are normally closed. Ram cylinder 3
1A and 31B are fixed. Reference numeral 34 denotes a switching valve provided in the middle of the pilot pipe line 24. The switching valve 34 is switched to the switching positions (a) and (b) by an operating lever 34A provided in the operator's cab, and the pilot is provided at the switching position (a). The inside of the pipe line 24 is set to a tank pressure state. When the switching valve 34 is switched to the switching position (b), the pilot pressure from the hydraulic pump 22 is applied to the check valves 33A and 33B to force them to open, and the ram cylinders 31A and 3B.
1B is allowed to expand and contract in response to external force.

Further, 35 denotes a rotary joint as a center joint provided between the lower traveling body and the upper revolving body, and the rotary joint 35 is the casing 1 and the check valves 33A and 33B.
And the direction switching valve 30 and the switching valve 34, and is provided in the middle of the main pipelines 29A and 29B, the pilot pipeline 24, the tank pipeline 32, and the like, and the pressure oil from the hydraulic pumps 21 and 22 is placed above. The cylinders 25, 26 and the check valves 33A, 33B and the like can be supplied and discharged even when the revolving structure is revolving.

The present embodiment is configured as described above, and the operation thereof will be described next by taking the case where the check valve device is applied to the left and right interlocking outriggers as an example.

First, when the direction switching valve 30 shown in FIG. 7 is switched from the neutral position (a) to the switching position (b) and the pressure oil from the hydraulic pump 21 is supplied to the port 2A side of the casing 1 through the main pipe line 29A. , The pressure oil acts on the check valve body 11A, and also acts on the check valve body 12A by being diverted through the communication passage 15A and the port 3A, and opens these valves to open the left and right outrigger cylinders 25, 26 oil chambers 25A and 26A are supplied via ports 4A and 5A. At this time, the pressure of the pressure oil acting on the check valve bodies 11A and 12A acts on each piston 14 shown in FIG. 5 to slide the piston 14 to the right in FIG. The check valves 11B and 12B are forcibly opened by the protrusion 14B of each piston 14.

As a result, the cylinders 25 and 26 are moved to oil chambers 25B and
The pressure oil in 6B is discharged from the ports 4B, 5B side of the casing 1 toward the ports 2B, 3B toward the tank 23 via the check valve bodies 11B, 12B, and the cylinders 25, 26 are moved to the oil chamber 25A. , Hydraulic pump 21 in 26A
The rods 25E and 26E are reduced by the pressure oil supplied from the left and right outriggers are housed in the lower traveling body. Further, when the direction switching valve 30 is switched to the switching position (c) and the pressure oil from the hydraulic pump 21 is supplied to the port 2B via the main pipe 29B, the reverse of the above case occurs,
Pressure oil is supplied to the oil chambers 25B and 26B of each of the cylinders 25 and 26, and the pressure oil in the oil chambers 25A and 26A is discharged toward the tank 23, whereby the rods 25E and 26E are extended and left. ， The right outrigger is interlocked and extended from the undercarriage.

Thus, in this embodiment, the hydraulic pressure source side ports 2A, 2B, 3A, 3B are formed on one side of the casing 1, and the actuator side ports 4A, 4B, 5A, 5B are formed on the other side, and between these. Check valve bodies 11A, 11B, 12
The check valve body 11 is connected and disconnected by A and 12B.
A pair of pistons 1 between A, 11B, 12A and 12B
4, 14 are provided, for example, check valve bodies 11A, 12A
When the valve is opened, the other check valve bodies 11B and 12B are forcibly opened by the respective pistons 14, and the port 2
Since communication passages 15A and 15B are formed between A and 3A and between ports 2B and 3B as a flow dividing circuit for communicating the two, when the check valve device is used in a left-right interlocking outrigger, for example, port 2A , 2B main line 29
A, 29B are connected, and ports 3A, 3B are connected to lid 18A,
By closing with 18B, the left and right outrigger cylinders 25, 26 can be operated in an interlocking manner.

When used for the left and right independent outriggers, the communication passages 15A and 15B are connected to the plugs 19A and 19A as illustrated in FIG.
19B shuts off and ports 2A, 2B, 3A, 3B
Is connected to the hydraulic pump 21 and the tank 23 via the main pipelines 29A, 29B, etc., the plugs 19A, 19
The left and right outrigger cylinders 25 and 26 can be operated independently by only performing a simple modification with B, and the check valve device can be commonly used for the left-right interlocking type and the left-right independent type. Further, a communication passage 15 serving as a shunt circuit is provided between the ports 2A and 2B and the ports 3A and 3B.
Since A and 15B are formed, these ports 2A and 2
It is not necessary to separately connect B, 3A, and 3B by using a distribution pipe or the like, and various effects can be obtained such as simplifying the hydraulic circuit.

Next, FIG. 8 shows a second embodiment of the present invention. The feature of this embodiment is that the check valve device is applied to a hydraulic circuit for left and right independent outriggers having a single hydraulic source. In this embodiment, the same components as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Further, in FIG. 8, since the left and right independent type is used, the screw holes 17A, 17B of the communication passages 15A, 15B are shown blocked by the plugs 19A, 19B as illustrated in FIG.

In the figure, reference numeral 41 denotes a hydraulic pilot type directional control valve provided between the rotary joint 35 and the casing 1 and provided in the middle of the main pipelines 29A, 29B. The directional control valve 41 has a hydraulic pilot portion 41A. It is connected to the pilot line 24 through the branch line 42, and when the switching valve 34 is switched to the switching position (b), the pilot pressure from the hydraulic pump 22 causes the switching position (a) to the switching position (b). Can be switched to. The directional switching valve 41 is connected to the ports 3A and 3B of the casing 1 through the other main pipe lines 43A and 43B at the switching position (B).

Here, first, when the direction switching valve 30 is switched to the switching position (b) in the state shown in FIG. 8, the pressure oil from the hydraulic pump 21 is supplied to the port 2A side via the main pipe 29A, and the check valve body 11A is supplied. And the check valve 11B is opened by the piston 14 shown in FIG. 5, the left outrigger cylinder 25 is supplied with pressure oil in the oil chamber 25A, and the pressure oil in the oil chamber 25B is stored in the tank 23. The rod 25E is contracted by being discharged toward. Further, when the direction switching valve 30 is switched to the switching position (c), the pressure oil is supplied into the oil chamber 25B, the pressure oil in the oil chamber 25A is discharged, and the rod 25E extends.

On the other hand, the switching valve 34 is moved from the switching position (a) to the switching position (b).
When the pilot pressure from the hydraulic pump 22 is applied to the hydraulic pilot portion 41A of the directional switching valve 41, the directional switching valve 41 is switched from the switching position (a) to the switching position (b). When the switching valve 30 is switched from the neutral position (a) to the switching positions (b) and (c), the pressure oil from the hydraulic pump 21 is transferred to the main pipelines 43A and 43B.
Through the oil chamber 26A of the right outrigger cylinder 26,
26B, the rod 26E of the cylinder 26 is contracted and extended independently of the cylinder 25.

Thus, in this embodiment configured as described above, substantially the same operation and effect as in the first embodiment can be obtained. In particular, in this embodiment, the directional control valve 41 is switched to the pilot position by the pilot pressure. ), (B), the left and right outrigger cylinders 25, 26 can be independently operated by pressure oil from the hydraulic pump 21 serving as a hydraulic pressure source, and the left and right independent hydraulic power sources are independent. It can be easily modified into a formula, there is no need to increase the number of pipe lines of the rotary joint 35, and the structure can be simplified.

In the first embodiment, the ports 2A and 2B are connected to the main conduits 29A and 29B, and the ports 3A and 3B are connected to the lid 1.
Although it is described that the ports 8A and 18B close the ports, instead of this, the ports 3A and 3B may be connected to the main pipelines 29A and 29B, and the ports 2A and 2B may be closed by the lids 18A and 18B.

[Effect of device]

As described in detail above, according to the present invention, among the first, second, third, and fourth hydraulic power source-side ports provided in the casing, the first, third, and second, fourth ports are provided. Since they are communicated with each other through a pair of communication passages, for example, when used as a left-right interlocking type, the third and fourth ports are detachably closed by a lid, and in the case of a left-right independent type, a pair of By simply detachably disconnecting the communication passage of (3) with a plug, it can be used in common in both cases, and even if there is only one hydraulic source, it can be easily applied to left and right independent outriggers, and various effects are exhibited.

[Brief description of drawings]

1 to 7 show a first embodiment of the present invention. FIG. 1 is a plan view of a check valve device, FIG. 2 is a front view of the check valve device, and FIG. 3 is a rear face of the check valve device. 4 and 5 are sectional views taken along the line IV-IV in FIG. 3, FIG. 5 is a sectional view taken along the line V-V in FIG. 2, and FIG. A sectional view similar to FIG. 4, FIG. 7 is a hydraulic circuit diagram, and FIG. 8 is a hydraulic circuit diagram showing a second embodiment. 1 ... Casing, 2A, 2B, 3A, 3B ... Hydraulic pressure source side port, 4A, 4B, 5A, 5B ... Actuator side port, 7 ... Valve holding member, 8 ... Valve seat, 9 ... Oil hole , 11A, 11B, 12A, 12B ... Check valve body, 14 ... Piston, 15A, 15B ... Communication passage, 1
8A, 18B ... Lid, 19A, 19B ... Plug, 2
1, 22 ... hydraulic pump, 23 ... tank, 25, 26
...... Outrigger cylinder, 25A, 26A ...... Rod side oil chamber, 25B, 26B ...... Bottom side oil chamber, 30, 41
... Direction switching valves, 31A, 31B ... Ram cylinders, 35
...... Rotary joint.

Claims (3)

[Scope of utility model registration request] 1. A casing, first, second, third and fourth hydraulic power source side ports respectively formed on one side of the casing, and a left side formed on the other side of the casing, respectively.
The first, second, third and fourth actuator side ports respectively connected to the rod side oil chamber and the bottom side oil chamber of the right outrigger cylinder, and the first, second, third and fourth ports. The actuator-side port and the first, second, third, and fourth hydraulic-power-source-side ports are placed between the actuator-side ports and the hydraulic-pressure-source-side ports in order to communicate and cut off the respective ports. The first, second, third, and fourth check valve bodies respectively provided in the casing, and when one of the first and second check valve bodies is opened, the other is opened, A pair of pistons slidably provided in the casing to open the other one of the third and fourth check valve bodies when the other one is opened, and the first and second check valve bodies.
Of the hydraulic pressure source side port of the third hydraulic pressure source side port and the second hydraulic pressure source side port of the fourth hydraulic pressure source side port to communicate with the pair of communication passages formed in the casing. Multiple check valve device for outriggers. 2. A utility model registration claim according to claim 1, wherein the third and fourth hydraulic pressure source side ports are detachably provided with a pair of lids for closing the respective hydraulic pressure source side ports. Multiple check valve device for outriggers. 3. A multiple check valve device for an outrigger according to claim 1, wherein a pair of plugs for disconnecting the communication passages are detachably provided in the communication passages.