CN111779065B - Excavator movable arm hydraulic control system and excavator - Google Patents
Excavator movable arm hydraulic control system and excavator Download PDFInfo
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- CN111779065B CN111779065B CN202010622523.5A CN202010622523A CN111779065B CN 111779065 B CN111779065 B CN 111779065B CN 202010622523 A CN202010622523 A CN 202010622523A CN 111779065 B CN111779065 B CN 111779065B
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- 239000003921 oil Substances 0.000 claims abstract description 194
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 45
- 230000008929 regeneration Effects 0.000 claims abstract description 33
- 238000011069 regeneration method Methods 0.000 claims abstract description 33
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
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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
-
- 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
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
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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
- E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
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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
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
Abstract
The invention relates to the field of excavators, and discloses an excavator movable arm hydraulic control system and an excavator. The invention is additionally provided with the floating valve, the movable arm oil cylinder is in a floating state, the pilot control oil port of the regeneration valve is controlled to be communicated with the hydraulic oil tank through the floating valve, so that the oil outlet of the rod cavity is communicated with the hydraulic oil tank through the regeneration valve to relieve the pressure of the rod cavity, and the problem that the bucket of the excavator collides with a ship plate or a pipeline violently is solved.
Description
Technical Field
The invention relates to the field of excavators, in particular to a hydraulic control system for a movable arm of an excavator and the excavator.
Background
The excavator is used for cabin operation, leveling operation of soft fragile objects and the like, and belongs to one of fine operation. The ship is affected by water flow fluctuation, and fluctuates up and down, and the ship still floats up and down even in an anchoring state, so that when the excavator works on the cabin, the bucket is difficult to avoid touching the ship board floating up and down, and the ship board or the excavator is easy to damage. When the surface of the soft fragile object is leveled, for example, after the pipeline is buried, if the sinking force of an excavator is too large, the pipeline is inevitably damaged.
Disclosure of Invention
The invention aims to provide an excavator boom hydraulic control system and an excavator, which can solve the problem that a bucket of the excavator collides with a ship plate, a pipeline and the like violently.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hydraulic control system for a movable arm of an excavator comprises a hydraulic pump, a multi-way valve, a movable arm oil cylinder and a hydraulic oil tank, wherein the multi-way valve can enable a rodless cavity of the movable arm oil cylinder to be communicated with an oil outlet of the hydraulic pump and a rod cavity of the movable arm oil cylinder to be communicated with the hydraulic oil tank so as to enable the movable arm oil cylinder to be in a floating state; further comprising:
the hydraulic control system comprises a regeneration valve and a floating valve, wherein the floating valve can control a pilot control oil port of the regeneration valve to be communicated with the hydraulic oil tank, so that an oil outlet of the rod cavity is communicated with the hydraulic oil tank through the regeneration valve.
As a preferable technical scheme of the excavator boom hydraulic control system, the excavator boom hydraulic control system further comprises a back pressure valve, the rod cavity can be communicated with the hydraulic oil tank sequentially through the regeneration valve and the back pressure valve, and the rod cavity can be communicated with the hydraulic oil tank sequentially through the multi-way valve and the back pressure valve.
As a preferable technical solution of the hydraulic control system for the boom of the excavator, the multi-way valve has a first working position, and is capable of communicating the rodless chamber with the hydraulic oil tank and communicating the rod chamber with the oil outlet of the hydraulic pump;
and/or the multi-way valve is also provided with a second working position, so that the rodless cavity and the rod cavity can be disconnected with an oil outlet of the hydraulic pump and the hydraulic oil tank.
As a preferred technical solution of the hydraulic control system for the movable arm of the excavator, the hydraulic control system further comprises a load compensation valve, wherein the load compensation valve is arranged on an oil inlet pipeline which is communicated with an oil outlet of the hydraulic pump and the rod cavity or the rodless cavity through the multi-way valve;
the hydraulic pump can control the valve core of the load compensation valve to act, so that the oil inlet pipeline is communicated or disconnected;
and the oil inlet pipeline positioned at the downstream of the load compensation valve is communicated with a first feedback oil port of the load compensation valve in a one-way mode, and the first feedback oil port is communicated with a second feedback oil port of the hydraulic pump.
As a preferable technical solution of the hydraulic control system for the boom of the excavator, an oil outlet of the hydraulic pump may be communicated with the first feedback oil port through the floating valve, so that the load compensation valve disconnects the oil inlet pipeline under the action of its own spring.
As a preferable technical scheme of the excavator boom hydraulic control system, the excavator boom hydraulic control system further comprises a first overflow valve, and the rod cavity can be communicated with the hydraulic oil tank through the first overflow valve.
As a preferable technical solution of the excavator boom hydraulic control system, the excavator boom hydraulic control system further includes a second overflow valve, and the rodless cavity can be communicated with the hydraulic oil tank through the second overflow valve.
As a preferable technical solution of the excavator boom hydraulic control system, the multi-way valve is a three-position seven-way reversing valve.
As a preferable technical solution of the excavator boom hydraulic control system, the multi-way valve is a pilot valve.
The invention also provides an excavator, which comprises the excavator movable arm hydraulic control system.
The invention has the beneficial effects that: the floating valve is additionally arranged, when the multi-way valve enables the boom cylinder to be in a floating state, the pilot control oil port of the regeneration valve is controlled to be communicated with the hydraulic oil tank through the floating valve, so that the oil outlet of the rod cavity is communicated with the hydraulic oil tank through the regeneration valve, the pressure of the rod cavity is relieved, and the problem that a bucket of an excavator collides with a ship plate or a pipeline is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings may be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a hydraulic schematic diagram of an excavator boom hydraulic control system provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a multiplex valve incorporating a load compensating valve according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a float valve provided by an embodiment of the present invention.
In the figure:
1. a load compensation valve; 11. a first oil port; 12. a second oil port; 13. a first feedback oil port;
2. a multi-way valve; 21. a first feedback port; 22. a first oil return port; 23. a first pump port; 24. a second oil return port; 25. a second feedback port; 26. a first working oil port; 27. a second working oil port;
3. a boom cylinder; 31. a rod cavity; 32. a rodless cavity;
4. a regeneration valve; 5. a back pressure valve; 6. a first overflow valve;
7. a float valve; 71. a second pump port; 72. a third feedback oil port; 73. a third oil return port; 74. a third working oil port; 75. a fourth working oil port;
8. a second relief valve.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
As shown in fig. 1, the present embodiment provides an excavator boom hydraulic control system, which includes a hydraulic pump, a multi-way valve 2, a boom cylinder 3 and a hydraulic oil tank, wherein a piston rod of the boom cylinder 3 is rotatably connected with a boom, the multi-way valve 2 enables a rodless cavity 32 of the boom cylinder 3 to communicate with an oil outlet of the hydraulic pump and a rod cavity 31 of the boom cylinder 3 to communicate with the hydraulic oil tank, so as to enable the boom cylinder 3 to be in a floating state; the multi-way valve 2 is also capable of communicating the rodless chamber 32 with the hydraulic tank and the rod chamber 31 with the outlet of the hydraulic pump.
As shown in fig. 1 and 2, in this embodiment, the multi-way valve 2 is a three-position seven-way reversing valve, and includes a first feedback port 21, a first oil return port 22, a first pump oil port 23, a second oil return port 24, a second feedback port 25, a first working oil port 26 and a second working oil port 27, where the first feedback port 21 and the second feedback port 25 are both communicated with the second feedback oil port of the hydraulic pump, the first oil return port 22 and the second oil return port 24 are both communicated with the hydraulic oil tank, the first pump oil port 23 is communicated with an oil outlet of the hydraulic pump, the first working oil port 26 is communicated with a rodless cavity 32, and the second working oil port 27 is communicated with a rod cavity 31. Preferably, the multiplex valve 2 is a pilot valve.
The multi-way valve 2 has a first working position, a second working position and a third working position, when the multi-way valve 2 is in the first working position, the first working oil port 26 is communicated with the first oil return port 22, the second working oil port 27 is communicated with the first pump oil port 23, the first feedback port 21 and the second oil return port 24 are both blocked, at this time, the rod chamber 31 is communicated with an oil outlet of the hydraulic pump, the rodless chamber 32 is communicated with the hydraulic oil tank, and a piston rod of the boom cylinder 3 retracts to lift the boom.
When the multi-way valve 2 is located at the second working position, the first feedback port 21, the first oil return port 22, the first pump oil port 23, the second oil return port 24, the second feedback port 25, the first working oil port 26 and the second working oil port 27 are all blocked, and at this time, the rod chamber 31 and the rodless chamber 32 are both disconnected from the oil outlet of the hydraulic pump and the hydraulic oil tank.
When the multi-way valve 2 is located at the third working position, the first working oil port 26 is communicated with the first pump oil port 23, the second working oil port 27 is communicated with the second oil return port 24, the second feedback port 25 and the first oil return port 22 are blocked, at the moment, the rodless cavity 32 is communicated with the oil outlet of the hydraulic pump, and the rod cavity 31 is communicated with the hydraulic oil tank, so that the boom cylinder 3 has a floating function.
Further, as shown in fig. 1, in order to avoid a severe collision between the bucket of the excavator and the ship plate or the pipeline, in the embodiment, when the multi-way valve 2 is in the second working position or the third working position, the rod chamber 31 is disconnected from the oil outlet of the hydraulic pump; meanwhile, the excavator boom hydraulic control system further comprises a regeneration valve 4 and a floating valve 7, wherein the floating valve 7 can control a pilot control oil port of the regeneration valve 4 to be communicated with a hydraulic oil tank, so that an oil outlet of the rod cavity 31 is communicated with the hydraulic oil tank through the regeneration valve 4.
Specifically, the regeneration valve 4 is a pilot check valve, an oil inlet of the regeneration valve 4 is communicated with the rod chamber 31, an oil outlet of the regeneration valve 4 is communicated with the hydraulic oil tank, and the regeneration valve 4 is normally in a closed state.
When the movable arm oil cylinder 3 is required to work in a floating state, the multi-way valve 2 is controlled to be in a third working position, working oil in the rod cavity 31 flows back to the hydraulic oil tank through the regeneration valve 4, and simultaneously flows back to the hydraulic oil tank through the multi-way valve 2, so that pressure relief of the rod cavity 31 is realized, and a bucket of the excavator can float up and down.
When the boom cylinder 3 works in a floating state, the rod chamber 31 can be disconnected from an oil outlet of the hydraulic pump, the rod chamber 31 is communicated with the hydraulic oil tank through the regeneration valve 4 or the regeneration valve 4 and the multi-way valve 2 at the same time, and the problem of severe collision between a bucket of the excavator and a ship plate or a pipeline is solved by releasing the pressure of the rod chamber 31.
Further, the excavator boom hydraulic control system further comprises a back pressure valve 5, an oil inlet of the back pressure valve 5 is simultaneously communicated with an oil outlet of the regeneration valve 4 and the first oil return port 22, so that the rod cavity 31 can be communicated with the hydraulic oil tank sequentially through the regeneration valve 4 and the back pressure valve 5, and the rod cavity 31 can be communicated with the hydraulic oil tank sequentially through the multi-way valve 2 and the back pressure valve 5. The rod chamber 31 is made to have a small return oil pressure by the back pressure valve 5.
Further, as shown in fig. 1 and 2, the hydraulic control system for the boom of the excavator further includes a load compensation valve 1, which is disposed on an oil inlet pipeline communicating an oil outlet of the hydraulic pump and the rod chamber 31 or the rodless chamber 32 through the multi-way valve 2; the hydraulic pump can control the valve core action of the load compensation valve 1 to connect or disconnect the oil inlet pipeline; an oil inlet pipeline positioned at the downstream of the load compensation valve 1 is communicated with a first feedback oil port 13 of the load compensation valve 1 in a one-way mode, and the first feedback oil port 13 is communicated with a second feedback oil port of the hydraulic pump. In this embodiment, the hydraulic pump is a load-sensitive pump, and the displacement of the hydraulic pump is adjusted by the oil pressure fed back to the second feedback port of the hydraulic pump through the first feedback port 21 or the second feedback port 25.
Specifically, the load compensation valve 1 is a two-position two-way pilot reversing valve and comprises a first oil port 11 and a second oil port 12, the load compensation valve 1 has a first state and a second state, when the load compensation valve 1 is in the first state, the first oil port 11 is communicated with the second oil port 12, and when the load compensation valve 1 is in the second state, the first oil port 11 is disconnected with the second oil port 12.
In this embodiment, the load compensation valve 1 is integrated in the multi-way valve 2, the first oil port 11 is communicated with the first pump oil port 23, when the multi-way valve 2 is located at the first working position, the second oil port 12 is communicated with the second working oil port 27, the second working oil port 27 is unidirectionally communicated with the first feedback oil port 13, the pilot control oil port of the load compensation valve 1 is communicated with the oil outlet of the hydraulic pump, the spool of the load compensation valve 1 acts under the oil pressure action of the pilot control oil port of the load compensation valve 1, so that the load compensation valve 1 is located at the first state, and the oil outlet of the hydraulic pump is communicated with the rod chamber 31 through the load compensation valve 1. When the multi-way valve 2 is in the third working position, the second oil port 12 is communicated with the first working oil port 26, the first working oil port 26 is communicated with the first feedback oil port 13 in a one-way mode, the pilot control oil port of the load compensation valve 1 is communicated with the oil outlet of the hydraulic pump, the valve core of the load compensation valve 1 moves under the oil pressure action of the pilot control oil port of the load compensation valve 1, so that the load compensation valve 1 is in the first state, and the oil outlet of the hydraulic pump is communicated with the rodless cavity 32 through the load compensation valve 1.
Further, the oil outlet of the hydraulic pump can be communicated with the first feedback oil port 13 through the floating valve 7, so that the load compensation valve 1 can disconnect the oil inlet pipeline under the action of the spring of the load compensation valve 1.
Specifically, as shown in fig. 1 to 3, the float valve 7 is a two-position four-way reversing valve, and includes a second pump oil port 71, a third feedback oil port 72, a third oil return port 73, a third working oil port 74 and a fourth working oil port 75, the second pump oil port 71 is communicated with an oil outlet of the hydraulic pump, the third feedback oil port 72 is communicated with the second feedback oil port of the hydraulic pump, the third oil return port 73 is communicated with the hydraulic oil tank, the third working oil port 74 is communicated with the second feedback port 25, and the fourth working oil port 75 is communicated with a pilot control oil port of the regeneration valve 4.
The floating valve 7 has a left position and a right position, when the floating valve 7 is in the left position, the third feedback oil port 72 is communicated with the third working oil port 74, the second pump oil port 71, the third oil return port 73 and the fourth working oil port 75 are all blocked, and the boom cylinder 3 is in a normal working state. When the floating valve 7 is in the right position, the third oil return port 73 is communicated with the fourth working oil port 75, so that the oil inlet and the oil outlet of the regeneration valve 4 are communicated, and the rod cavity 31 can be communicated with a hydraulic oil tank through the regeneration valve 4 and the back pressure valve 5; meanwhile, the second pump oil port 71 is communicated with the third working oil port 74, so that the oil outlet of the hydraulic pump is communicated with the first feedback oil port 13 of the load compensation valve 1 through the float valve 7, and thus the load compensation valve 1 is switched to the second state under the action of its own spring, so as to disconnect the second working oil port 27 from the oil outlet of the hydraulic pump, and thus disconnect the rod chamber 31 from the outlet of the hydraulic pump.
When the float valve 7 is in the right position, no matter which working position the multi-way valve 2 is in, the oil outlet of the rod cavity 31 and the hydraulic pump can be disconnected, and meanwhile, the rod cavity 31 is communicated with the hydraulic oil tank sequentially through the regeneration valve 4 and the back pressure valve 5, so that even if the multi-way valve 2 is switched to the first working position due to mistaken touch, the bucket cannot violently collide with a ship board or a pipeline and the like.
Further, the excavator boom hydraulic control system further comprises a first overflow valve 6 and a second overflow valve 8, the rod cavity 31 can be communicated with the hydraulic oil tank through the first overflow valve 6, and the rodless cavity 32 can be communicated with the hydraulic oil tank through the second overflow valve 8. The rod chamber 31 is protected at high pressure by the first relief valve 6, and the rodless chamber 32 is protected at high pressure by the second relief valve 8.
The floating valve 7 works at the left position, the movable arm oil cylinder 3 is in a normal working state, and a piston rod of the movable arm oil cylinder 3 extends and retracts normally.
The float valve 7 works at the right position, and no matter which working position the multi-way valve 2 is at, the rod cavity 31 can be communicated with the hydraulic oil tank through the regeneration valve 4 and the back pressure valve 5 in sequence, so that severe collision between a bucket and a ship board or a pipeline and the like is avoided, and the problem of mistaken touch of the multi-way valve 2 is solved.
The embodiment also provides an excavator, which comprises the excavator boom hydraulic control system.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Claims (6)
1. A hydraulic control system for a movable arm of an excavator comprises a hydraulic pump, a multi-way valve (2), a movable arm oil cylinder (3) and a hydraulic oil tank, wherein the multi-way valve (2) can enable a rodless cavity (32) of the movable arm oil cylinder (3) to be communicated with an oil outlet of the hydraulic pump and a rod cavity (31) of the movable arm oil cylinder (3) to be communicated with the hydraulic oil tank so as to enable the movable arm oil cylinder (3) to be in a floating state; it is characterized by also comprising:
the hydraulic control system comprises a regeneration valve (4) and a floating valve (7), wherein the floating valve (7) can control a pilot control oil port of the regeneration valve (4) to be communicated with the hydraulic oil tank, so that an oil outlet of the rod cavity (31) is communicated with the hydraulic oil tank through the regeneration valve (4);
the multi-way valve (2) has a first working position enabling the rodless chamber (32) to communicate with the hydraulic tank and the rod chamber (31) to communicate with the outlet of the hydraulic pump;
the multi-way valve (2) is also provided with a second working position, so that the rodless cavity (32) and the rod cavity (31) can be disconnected with an oil outlet of the hydraulic pump and the hydraulic oil tank;
the multi-way valve (2) is also provided with a third working position which can enable the rod cavity (31) to be communicated with the hydraulic oil tank and enable the rodless cavity (32) to be communicated with an oil outlet of the hydraulic pump;
the hydraulic oil tank is characterized by further comprising a back pressure valve (5), the rod cavity (31) can be communicated with the hydraulic oil tank sequentially through the regeneration valve (4) and the back pressure valve (5), and the rod cavity (31) can be communicated with the hydraulic oil tank sequentially through the multi-way valve (2) and the back pressure valve (5);
the hydraulic pump is characterized by further comprising a load compensation valve (1) which is arranged on an oil inlet pipeline communicated with an oil outlet of the hydraulic pump and the rod cavity (31) or the rodless cavity (32) through the multi-way valve (2);
the hydraulic pump can control the valve core of the load compensation valve (1) to act, so that the oil inlet pipeline is communicated or disconnected;
the oil inlet pipeline positioned at the downstream of the load compensation valve (1) is in one-way communication with a first feedback oil port (13) of the load compensation valve (1), and the first feedback oil port (13) is communicated with a second feedback oil port of the hydraulic pump;
an oil outlet of the hydraulic pump can be communicated with the first feedback oil port (13) through the floating valve (7), so that the load compensation valve (1) can disconnect the oil inlet pipeline under the action of a spring of the load compensation valve;
the floating valve (7) is a two-position four-way reversing valve and comprises a second pump oil port (71), a third feedback oil port (72), a third oil return port (73), a third working oil port (74) and a fourth working oil port (75), the second pump oil port (71) is communicated with an oil outlet of a hydraulic pump, the third feedback oil port (72) is communicated with a second feedback oil port of the hydraulic pump, the third oil return port (73) is communicated with a hydraulic oil tank, the third working oil port (74) is communicated with a second feedback port (25), and the fourth working oil port (75) is communicated with a pilot control oil port of the regeneration valve (4);
the floating valve (7) has a left position and a right position, when the floating valve (7) is at the left position, the third feedback oil port (72) is communicated with the third working oil port (74), the second pump oil port (71), the third oil return port (73) and the fourth working oil port (75) are all blocked, and the boom oil cylinder (3) is in a normal working state; when the floating valve (7) is in the right position, the third oil return port (73) is communicated with the fourth working oil port (75), so that an oil inlet and an oil outlet of the regeneration valve (4) are communicated, and the rod cavity (31) can be communicated with a hydraulic oil tank through the regeneration valve (4) and the back pressure valve (5); meanwhile, the second pump oil port (71) is communicated with the third working oil port (74), so that the oil outlet of the hydraulic pump is communicated with the first feedback oil port (13) of the load compensation valve (1) through the floating valve (7), the load compensation valve (1) is switched to a second state under the action of a spring, the second working oil port (27) is disconnected from the oil outlet of the hydraulic pump, and the rod cavity (31) is disconnected from the outlet of the hydraulic pump.
2. The excavator boom hydraulic control system according to claim 1, further comprising a first overflow valve (6), wherein the rod chamber (31) is communicable with the hydraulic tank through the first overflow valve (6).
3. The excavator boom hydraulic control system of claim 1, further comprising a second overflow valve (8), the rodless chamber (32) being communicable with the hydraulic tank through the second overflow valve (8).
4. The excavator boom hydraulic control system as claimed in claim 1, wherein said multi-way valve (2) is a three-position seven-way directional valve.
5. The excavator boom hydraulic control system according to claim 1, characterized in that the multi-way valve (2) is a pilot valve.
6. An excavator characterized by comprising the excavator boom hydraulic control system of any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010622523.5A CN111779065B (en) | 2020-06-30 | 2020-06-30 | Excavator movable arm hydraulic control system and excavator |
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| CN202010622523.5A CN111779065B (en) | 2020-06-30 | 2020-06-30 | Excavator movable arm hydraulic control system and excavator |
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| CN111779065B true CN111779065B (en) | 2023-01-06 |
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| CN112982522B (en) * | 2021-02-20 | 2022-10-04 | 三一重机有限公司 | Control system of attachment replacement device of excavator and excavator with same |
| CN113775612A (en) * | 2021-09-18 | 2021-12-10 | 柳州柳工挖掘机有限公司 | Engineering machinery hydraulic control system and engineering machinery |
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| CN105705706B (en) * | 2013-10-31 | 2017-10-10 | 沃尔沃建造设备有限公司 | Flow control valve for the engineering equipment with float function |
| CN103643709B (en) * | 2013-12-24 | 2015-10-21 | 太原重工股份有限公司 | Hydraulic excavator for mine swing arm hydraulic control system |
| CN104074825B (en) * | 2014-07-17 | 2016-01-13 | 圣邦集团有限公司 | Two-way choice type interflow load-transducing multi-way valve |
| KR20170091933A (en) * | 2016-02-02 | 2017-08-10 | 현대중공업 주식회사 | Hydraulic Oil Control System in Construction Equipment |
| CN109973447B (en) * | 2019-04-01 | 2020-08-11 | 山东临工工程机械有限公司 | Hydraulic control system and engineering machinery |
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Address after: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee after: WEICHAI POWER Co.,Ltd. Patentee after: Weichai Hydraulic Transmission Co.,Ltd. Address before: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee before: WEICHAI POWER Co.,Ltd. Patentee before: LINDE HYDRAULICS (CHINA) Co.,Ltd. |
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