JP3730715B2 - Hydraulic control valve device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic control valve device for controlling an actuator such as a hydraulic excavator, and more particularly to a hydraulic control valve device for a device other than the standard specification, that is, a device assumed to include an actuator for an optional attachment.
[0002]
[Prior art]
In general, as shown in FIGS. 2 and 3, the hydraulic excavator typically includes actuators including a swing motor 20A, an arm cylinder 20B, a left travel motor 20C, a boom cylinder 20D, a bucket cylinder 20E, and a right travel motor 20F. have. And these are comprised so that it may drive with a pair (1st and 2nd) hydraulic pumps 10 and 12 (refer FIG. 4) driven with an engine (not shown).
[0003]
That is, this type of hydraulic control valve device generally controls the actuators 20A to 20C and 20D to 20F connected to the first pump 10 and the second pump 12, as shown in FIG. The first multiple valve block 14 and the second multiple valve block 16 for this purpose, and a merging block 18 interposed between these multiple valve blocks 14 and 16. The multiple valve blocks 14 and 16 are center bypass control valves that open and close between the center bypass oil passages 24 and 26 and the return oil passages 28 and 30 of the respective multiple control valves 22A to 22C and 22D to 22F. 32 and 34 are provided.
[0004]
The merging block 16 also supplies the supply oil passages 36 and 38 for joining the discharge pressure oil in the multiple valve blocks 14 and 16 through the check valves 36a and 38a, respectively, and the return oil passage 40 (the return oil passage). (Including paths 28 and 30).
[0005]
In the figure, reference numerals 14a and 16a indicate pump ports of the multiple valve blocks 14 and 16, respectively, 18a indicates a tank port of the merging block 18, and 42 indicates a tank.
[0006]
However, such a hydraulic excavator often requires an actuator for an optional attachment such as a breaker or a crusher in addition to the standard specification. For this reason, this type of hydraulic control valve device is normally recommended for preliminary installation of an optional control valve for the attachment actuator. That is, in the apparatus of FIG. 4, an optional control valve 22G is provided in advance in the second multiple valve block 16, and a required attachment actuator 20G is connected to the option control valve 22G as necessary. It is configured.
[0007]
Therefore, in such a hydraulic control valve device, the actuators 20A to 20C and 20D to 20G are respectively connected to the multiple valve blocks 14 and 16 via the control valves 22A to 22C and 22D to 22G. Driven. In this case, some of them, here, the boom cylinder 20D (and its control valve 22D) in the second multiple valve block 16, and the swing motor 20A (and its control valve 22A) in the first multiple valve block 14 are used. ) Means that the discharge pressure oil from the first pump 10 in the first multiple valve block 16 or the second pump 12 in the second multiple valve block 14 also through the merging block 18. Even if the discharge pressure oil from the coalesce is joined, it can be driven.
[0008]
For example, when the control valve 22D (boom cylinder 20D) is driven via the junction block 18, the center bypass control valve 32 is closed via the pilot port 32a and the control valve 22D is operated via the pilot port 22Da. To do. As a result, the discharge pressure oil from the first pump 10 in the first multiple valve block 16 is supplied from the center bypass oil passage 24 through the supply oil passage 36 and the check valve 36a to the second multiple valve block. In the center bypass control valve 26 of No. 14, it joins with the discharge pressure oil from the second pump 12, passes through the control valve 22D, is supplied to the boom cylinder 20D, and drives it.
[0009]
Therefore, according to such a hydraulic control valve device (hereinafter referred to as a combined hydraulic control valve device or simply referred to as a hydraulic control valve device) in which a joining block is interposed between the left and right multiple valve blocks, By installing an optional control valve in advance, it can be applied relatively easily to actuators for attachments other than the standard specification, and the discharge pressure oil between both multiple valve blocks can be passed through the intermediate merge block. It can be easily and easily merged.
[0010]
[Problems to be solved by the invention]
However, such a conventional combined hydraulic control valve device still has the following problems.
[0011]
That is, the conventional hydraulic control valve device is formed in a combination type as described above, and an optional control valve is incorporated in the multi-valve block in advance, so that it is relatively easy for option attachments other than the standard specification. And the discharge pressure oil between both multiple valve blocks can be easily merged.
[0012]
However, the number of hydraulic excavators that require an optional attachment is very small in quantity compared to the standard specification that does not require this, but when it is needed, the attachment can be used. Particularly, in recent civil engineering work, etc., a plurality (at least two) are required at any predetermined installation position.
[0013]
For this reason, in the conventional hydraulic control valve device, when the option attachment is not required, the preliminary option control valve in the multiple valve block is wasted and the installation cost is increased. Further, when an optional attachment is required, an additional control valve that is separate from the preliminary control valve is often required. In installing the hydraulic excavator, the body of the hydraulic excavator is narrow, and thus extremely difficult work is required. This further increases the installation cost.
[0014]
Therefore, an object of the present invention is a hydraulic control valve device, and when an optional actuator is required, according to the required number, the optional control valve can be simply and easily, that is, pump discharge pressure oil supply oil. It is an object of the present invention to provide a hydraulic control valve device that can be installed without requiring a connecting piping line between the passage and its return oil passage.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, a hydraulic control valve device according to the present invention includes a first actuator control multi-valve block and a second actuator control multi-channel connected to a first pump and a second pump, respectively. And a merging block interposed between the first multiple valve block and the second multiple valve block, wherein the first multiple valve block and the second multiple valve block are A center bypass control valve that opens and closes the center bypass oil passage is provided on the most downstream side of the center bypass oil passage of each multiple control valve, and the merging block further includes the first multiple valve block and the second multiple valve block. a hydraulic control valve apparatus comprising a respective feed and / or merging oil passage and the return oil passage within the valve block, with respect to the joint block, the supply and / or One or more supply ports and return ports for external connection respectively communicating with the flow oil passage and the return oil passage are provided, and an optional control valve of an actuator for an optional attachment is provided for the supply port and the return port. It is characterized by being detachably mounted.
[0016]
In this case, the optional control valve, by interlocking with a center bypass control valve of the first multiple-valve blocks and / or the second multiple-valve block, configured to drive the actuator for the option attachment be able to.
[0017]
In the present invention, in the combined hydraulic control valve device in which the merge block is interposed between the left and right multiple valve blocks, the merge block includes the supply of pump discharge pressure oil and / or the merge oil path therein. The return oil passage has one or more external connection supply ports and return ports communicating with each other, and the supply port and the return port are detachable (directly mountable). As configured).
[0018]
Therefore, according to the present invention, when an optional actuator is required, depending on the required number, the optional control valve can be easily connected to the merging block (pump discharge pressure oil supply oil passage and its return oil). Obviously it can be installed (without the need for connection to the road). In this case, it goes without saying that the pump discharge pressure oil between the multiple valve blocks is easily joined through the joining block.
[0019]
【Example】
Next, embodiments of a hydraulic control valve device according to the present invention will be described in detail below with reference to the accompanying drawings. For convenience of explanation, the same components as those of the conventional structure shown in FIGS. 2 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0020]
First, in FIG. 1, the basic configuration of the hydraulic control valve device of the present invention is the same as the conventional configuration. Therefore, although it overlaps, it demonstrates briefly again for easy understanding. That is, the hydraulic control valve device basically includes the first multiple valve block 14 for controlling the actuators 20A to 20C and 20D to 20F, which are connected to the first pump 10 and the second pump 12. The second multiple valve block 16 and a merging block 18 interposed between the multiple multiple valve blocks 14 and 16 are configured.
[0021]
The multiple multiple valve blocks 14 and 16 are disposed on the center bypass oil passages 24 and 26 of the multiple control valves 22A to 22C and 22D to 22F, respectively, between the return fluid passages 28 and 30. Center bypass control valves 32 and 34 are opened and closed. In addition, the merging block 18 has branch center bypass oil passages 50 and 52 which are respective supply oil passages in the multiple valve blocks 14 and 16 and their merging oil passages 36 and 38 (check valves 36a and 38a, respectively). And its return oil passage 40 (including the return oil passages 28 and 30).
[0022]
In the hydraulic control valve apparatus, each actuator 20A~20C and 20D~20F, together are driven via the respective control valves 22A~22C and 22D～22F, some of, wherein the first Tarenben The control valve 22A for the swing motor 20A in the block 14 and the control valve 22D for the boom cylinder 20D in the second multiple valve block 16 are connected via the junction block 18, that is, the second multiple valve block. The pump is configured to be driven even if the discharge pressure oil from the second pump 12 in 16 or the discharge pressure oil from the first pump 10 in the first multiple valve block 14 merges.
[0023]
In the figure, reference numerals 14a and 16a indicate pump ports of the multiple valve blocks 14 and 16, respectively, 18a indicates a tank port of the merging block 18, and 42 indicates a tank.
[0024]
However, in the present embodiment, in the above-described configuration, one or more (two in the illustrated example) communicating with each of the supply oil passages 50 and 52 and the return oil passage 40 with respect to the merging block 18. Supply ports and return ports 54a and 56a for external connection are provided, and option control valves 54 and 56 of actuators 58 and 60 for option attachments are detachably attached to the supply ports and return ports 54a and 56a. .
[0025]
That is, in the present invention, the ports 54a and 56a on the confluence block 18 are normally blocked by plugs or the like in the case of a standard type hydraulic excavator or at the time of shipment, but an optional attachment is required. Then, the optional actuators 58 and 60 can be easily installed by removing the plug and attaching the optional control valves 54 and 56. In this case, the control valves 54 and 56 for the actuators 58 and 60 are respectively associated with the center bypass control valves 32 in the first multiple valve block 14 and / or the second multiple valve block 16. 34, the pump pressure oil returns from the supply oil passages 50 and 52 to the tank 42 through the control valves 54 and 56 and the actuators 58 and 60 through the return oil passage 40. Therefore, it can be driven easily.
More specifically, for example, when the center bypass control valve 32 is not provided on the first multiple valve block 14 side and each control valve 22A, 22B, 22C is in a neutral state, the pump 10 The pressure oil flows from the center bypass outlet side of the control valve 22C to the tank 42, and therefore the pressure oil does not flow to the actuator 58 even if the control valve 54 is driven. In order to avoid this, the center bypass control valve 32 is provided, and when the actuator 58 is driven, the control valve 54 is interlocked with the center bypass control valve 32 to ensure the supply of pressure oil to the actuator 58. I have to.
[0026]
As described above, according to the present invention, when the optional actuator is required, the optional control valve can be easily arranged on the junction block (that is, the supply oil passage for the pump discharge pressure oil and the pump actuator according to the required number). (Without the need to connect to the return oil path). Therefore, according to the present invention, the option control valve is not wasted compared with the conventional hydraulic control valve device of this type, so that the installation cost can be reduced. Moreover, the installation work when necessary can be easily achieved. In this case, of course, the pump discharge pressure oil between the two multiple valve blocks is merged via the merge block.
[0027]
The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and many design changes can be made without departing from the spirit of the present invention. Further, the optional control valve of the present invention can be provided not on the merging block as described above but on the multiple valve block, but in this case, in general, in some cases, particularly when applied to other than the hydraulic excavator. I can not escape that disadvantage.
[0028]
【The invention's effect】
As described above, the hydraulic control valve device according to claim 1 of the present invention includes the first actuator control multiple valve block and the second actuator connected to the first pump and the second pump, respectively. A control multiple valve block; and a merging block interposed between the first multiple valve block and the second multiple valve block, the first multiple valve block and the second multiple valve The block includes a center bypass control valve that opens and closes the center bypass oil passage on the most downstream side of the center bypass oil passage of each of the multiple control valves, and the merging block includes the first multiple valve block and the second multiple control valve. Each of the supply and / or merging oil passages and the return oil passages in the multiple valve block of the multiple valve block, the supply and Alternatively, one or more supply ports and return ports for external connection respectively communicating with the merged oil passage and the return oil passage are provided, and an optional control valve of an actuator for an optional attachment is provided to the supply port and the return port. The optional control valves can be easily installed according to the required number of optional actuators when the optional actuators are required. This can be easily achieved, and the cost of the hydraulic control valve device can be reduced, and the utilization can be improved.
[Brief description of the drawings]
FIG. 1 is a hydraulic circuit diagram showing an embodiment of a hydraulic control valve device according to the present invention.
2 is a side view of a hydraulic excavator equipped with the hydraulic control valve device shown in FIG. 1;
FIG. 3 is a rear view of the hydraulic excavator shown in FIG. 2;
FIG. 4 is a hydraulic circuit diagram showing a conventional hydraulic control valve device.
[Explanation of symbols]
10, 12 Pump 14, 16 Multiple valve block 18 Merge block 20A-20F Standard specification actuators 22A-22F Multiple control valves 24, 26 Center bypass oil passages 28, 30 Return oil passages 32, 34 Center bypass control valves 36, 38 Joint oil passage 40 Return oil passage 42 Tank 50, 52 Supply oil passage (branch center bypass oil passage)
54, 56 Option control valve 54a, 56a Supply port and return port 58, 60 Option actuator

Claims (2)

A first actuator control multi-valve block and a second actuator control multi-valve block connected to the first pump and the second pump, respectively, the first multi-valve block and the second multi-valve block; The first multi-valve block and the second multi-valve block are located on the most downstream side on the center bypass oil passage of the respective multi-control valves. A center bypass control valve for opening and closing the bypass oil passage , and the merging block is a supply and / or merging oil passage and a return oil passage in each of the first multiple valve block and the second multiple valve block. a hydraulic control valve apparatus comprising, with respect to the joint block, one of which respectively communicate with the supply and / or merging oil passage and the return oil path or its More provided with a supply port and return ports for external connection, to these supply ports and the return port, the hydraulic control valve apparatus characterized by removably mounting the optional control valve actuator for optional attachment. The optional control valve, by interlocking with a center bypass control valve of the first multiple-valve blocks and / or the second multiple-valve block, formed by driving the actuator for the option attachment according to claim 1, wherein Hydraulic control valve device.

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