CN114321044A - Bucket rod control valve structure and excavator - Google Patents
Bucket rod control valve structure and excavator Download PDFInfo
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- CN114321044A CN114321044A CN202111670124.7A CN202111670124A CN114321044A CN 114321044 A CN114321044 A CN 114321044A CN 202111670124 A CN202111670124 A CN 202111670124A CN 114321044 A CN114321044 A CN 114321044A
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- 230000008929 regeneration Effects 0.000 claims abstract description 59
- 238000011069 regeneration method Methods 0.000 claims abstract description 59
- 239000003921 oil Substances 0.000 description 139
- 239000010720 hydraulic oil Substances 0.000 description 26
- 230000001172 regenerating effect Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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Abstract
The invention relates to the technical field of excavators, and particularly discloses a bucket rod control valve structure and an excavator. The first valve core of the first control valve is provided with a rodless cavity which can be communicated with the first pressure source and the arm cylinder, the rodless cavity of the arm cylinder is communicated with a working position A1 of the oil tank, the working position A2 which can be disconnected from the rodless cavity, the first pressure source and the oil tank, the second valve core of the second control valve is provided with a working position B1 which is communicated with the second pressure source and the rodless cavity and is communicated with the regeneration port, and a working position B2 which can be disconnected from the rodless cavity, the first pressure source and the oil tank, when the arm is retracted, the second valve core is positioned at the working position B2, and the regeneration one-way valve allows oil to flow into an input port B1 which is communicated with the second pressure source through the regeneration port, so that the oil in the rod cavity can be filled into the rodless cavity, a regeneration cut-off valve is not needed, the regeneration back pressure can be reduced, and the energy efficiency can be improved.
Description
Technical Field
The invention relates to the technical field of excavators, in particular to a bucket rod control valve structure and an excavator.
Background
The hydraulic control system of the bucket rod of the existing excavator generally adopts double-pump double-valve-core control. Taking the arm cylinder as an example, the two pumps respectively supply hydraulic oil to the arm cylinder synchronously through the two valve cores. In the bucket rod recycling process, the rodless cavity of the bucket rod oil cylinder may be positive pressure or negative pressure, and when the pressure is negative pressure, the pressure of the rod cavity of the bucket rod oil cylinder is greater than that of the rodless cavity of the bucket rod oil cylinder, so that hydraulic oil in the rod cavity needs to be supplemented into the oil inlet side of the rodless cavity through the oil return channel in the valve core and the regenerative check valve. When positive pressure is not required. However, in order to avoid the impact phenomenon, a regeneration cut-off valve is usually required to be added on the oil return channel, when the negative pressure or the smaller positive pressure in the rodless cavity exists, the regeneration cut-off valve is in a throttling opening state, the oil return back pressure is increased, and the phenomena of suction front impact and the like caused by the fact that the bucket rod oil cylinder extends out too fast can be prevented; when the positive pressure in the rodless cavity is higher than the pressure, the regeneration cut-off valve is completely opened and is not throttled any more, so that the regeneration is released.
However, when the throttle of the regeneration cut-off valve is opened, the oil return back pressure is high, the generated pressure loss is large, and the power loss is also large.
Disclosure of Invention
The invention aims to: the bucket rod control valve structure and the excavator are provided to solve the problem that pressure loss is large due to the fact that a regeneration cut-off valve is adopted to open or release regeneration in the related art.
In one aspect, the present invention provides a bucket rod control valve structure, including:
the first control valve comprises a first valve core, the first control valve is provided with an input port A1, an oil return port A1, an output port A1 and an output port A2, the input port A1 is used for being communicated with a first pressure source, the oil return port A1 is used for being communicated with an oil tank, the output port A1 is used for being communicated with an oil port A, the output port A2 is used for being communicated with an oil port B, the oil port A is communicated with a rodless cavity of an arm cylinder, the oil port B is communicated with a rod cavity of the arm cylinder, the first valve core can be switched between a working position A1 and a working position A2, when the first valve core is located at the working position A1, the input port A1 is communicated with the output port A1, and the oil return port A1 is communicated with the output port A2; when the first valve spool is located at the working position a2, the input port a1, the oil return port a1, the output port a1 and the output port a2 are all closed;
the second control valve comprises a second valve core, the first control valve is provided with an input port B1, a regeneration port, an oil return port B1, an output port B1 and an output port B2, the input port B1 is used for being communicated with a second pressure source, the oil return port B1 is used for being communicated with an oil tank, the output port B1 is used for being communicated with the oil port A, the output port B2 is used for being communicated with the oil port B, the second valve core can be switched between a working position B1 and a working position B2, when the second valve core is located at the working position B1, the input port B1 is communicated with the output port B1, the regeneration port is communicated with the output port B2, and the oil return port B1 is disconnected; when the second spool is located at the working position B2, the input port B1, the regeneration port, the oil return port B1, the output port B1, and the output port B2 are all closed;
a regeneration check valve disposed between the regeneration port and the input port B1 and allowing oil to flow only from the regeneration port to the input port B1.
As a preferable configuration of the arm control valve structure, the first control valve further includes a first pilot hydraulic control end for driving the first spool to move to the operating position a1, and the first pilot hydraulic control end is supplied with pilot oil by a first oil supply device.
As a preferred technical scheme of the bucket rod control valve structure, the bucket rod control valve structure further comprises a first electric proportional flow valve arranged on an oil supply pipeline of the first pilot hydraulic control end.
As a preferable configuration of the arm control valve structure, the second control valve further includes a second pilot hydraulic control end for driving the second spool to move to the operating position B1, and the second pilot hydraulic control end is supplied with pilot oil by a second oil supply device.
As a preferred technical scheme of the bucket rod control valve structure, the bucket rod control valve structure further comprises a second electric proportional flow valve arranged on an oil supply pipeline of the second pilot hydraulic control end.
As a preferable technical solution of the arm control valve structure, the first valve spool further has a working position A3, the working position a2 is located between the working position A3 and the working position a1, the first valve spool can be switched between the working position a1, the working position a2 and the working position A3, when the first valve spool is located at the working position A3, the input port a1 is communicated with the output port a2, and the oil return port a1 is communicated with the output port a 1.
As a preferred technical solution of the arm control valve structure, the second valve spool further has a working position B3, the working position B2 is located the working position B3 with between the working position B1, the second valve spool can be in the working position B1 the working position B2 with switch between the working positions B3, when the second valve spool is located when the working position B3, the input port B1 with the output port B2 communicates, the oil return port B1 with the output port B2 communicates, and the regeneration port is disconnected.
As a preferable technical solution of the arm control valve structure, the first control valve further includes a third pilot hydraulic control end for driving the first valve spool to move to the operating position a3, the second control valve further includes a fourth pilot hydraulic control end for driving the second valve spool to move to the operating position B3, and the third pilot hydraulic control end and the fourth pilot hydraulic control end are both supplied with pilot oil by a third oil supply device.
As a preferable configuration of the arm control valve structure, the arm control valve structure further includes a load holding valve, one end of the load holding valve is communicated with the oil port B, and the other end of the load holding valve is communicated with the output port a2 and the output port B2, respectively.
In another aspect, the present disclosure provides a shovel including the stick control valve structure of any one of the above aspects.
The invention has the beneficial effects that:
the invention provides a bucket rod control valve structure and a excavator. The first control valve comprises a first valve core, the first control valve is provided with an input port A1, an oil return port A1, an output port A1 and an output port A2, the input port A1 is used for being communicated with a first pressure source, the oil return port A1 is used for being communicated with an oil tank, the output port A1 is used for being communicated with an oil port A, the output port A2 is used for being communicated with an oil port B, the oil port A is communicated with a rodless cavity of the arm cylinder, and the oil port B is communicated with a rod cavity of the arm cylinder. The first valve core can be switched between a working position A1 and a working position A2, when the first valve core is positioned at the working position A1, the input port A1 is communicated with the output port A1, the oil return port A1 is communicated with the output port A2, and when the first valve core is positioned at the working position A2, the input port A1, the oil return port A1, the output port A1 and the output port A2 are all closed. The second control valve comprises a second valve core, the first control valve is provided with an input port B1, a regeneration port, an oil return port B1, an output port B1 and an output port B2, the input port B1 is used for being communicated with a second pressure source, the oil return port B1 is used for being communicated with an oil tank, the output port B1 is used for being communicated with the oil port A, and the output port B2 is used for being communicated with the oil port B. The second valve spool can be switched between a working position B1 and a working position B2, when the second valve spool is positioned at a working position B1, the input port B1 is communicated with the output port B1, the regeneration port is communicated with the output port B2, and the oil return port B1 is disconnected; when the second valve spool is located at the working position B2, the input port B1, the regeneration port, the oil return port B1, the output port B1 and the output port B2 are all closed; and the regeneration one-way valve is arranged between the regeneration port and the input port B1, only allows oil to flow from the regeneration port to the input port B1, and when the second valve core is located at the working position B1 and if the oil pressure in the rod cavity is greater than that of the rodless cavity, the pressure oil in the rod cavity of the arm cylinder can be supplemented to the input port B1 through the second valve core and the regeneration one-way valve and then supplemented to the rodless cavity so as to avoid suction. The regenerative check valve remains closed if the oil pressure in the rod chamber is less than the oil pressure in the rodless chamber. This dipper control valve structure can need not to adopt the regeneration trip valve among the prior art, can effectively reduce regeneration backpressure, improves the efficiency to the regeneration oil duct can set up in the outside of second case, and the regeneration flow can not receive the influence of second case intensity.
Drawings
FIG. 1 is a first structural schematic diagram of an example of a stick control valve configuration (first spool in operating position A2, second spool in operating position B2);
FIG. 2 is a second structural schematic diagram of the arm control valve configuration of the present embodiment (the first spool is in the operating position A1, and the second spool is in the operating position B1);
FIG. 3 is a third structural schematic diagram of the arm control valve configuration of the present embodiment (the first spool is in the operating position A1, and the second spool is in the operating position B2);
FIG. 4 is a fourth structural schematic diagram of the arm control valve configuration of the present embodiment (the first spool is in the operating position A2, and the second spool is in the operating position B1);
fig. 5 is a fifth structural schematic diagram of the arm control valve structure according to the embodiment of the present invention (the first valve spool is located at the operating position a3, and the second valve spool is located at the operating position B3).
In the figure:
11. a first valve spool; 12. a first pilot hydraulic control end; 13. a third pilot hydraulic control end;
21. a second valve core; 22. a second pilot hydraulic control end; 23. a fourth pilot hydraulic control end;
3. a regenerative check valve;
4. a load holding valve;
5. a first on-off control valve;
6. a second on-off control valve;
7. a bucket rod cylinder; 71. a rod cavity; 72. a rodless cavity.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope 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 simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
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, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 specific cases to those skilled in the art.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the bucket rod oil cylinder in the prior art, in the bucket rod recycling process, a rodless cavity of the bucket rod oil cylinder may be positive pressure or negative pressure, and when the pressure is negative pressure, because the pressure of a rod cavity of the bucket rod oil cylinder is greater than that of the rodless cavity of the bucket rod oil cylinder, hydraulic oil in the rod cavity needs to be supplemented into an oil inlet side of the rodless cavity through an oil return channel in a valve core and a regeneration one-way valve. When positive pressure is not required. However, in order to avoid the impact phenomenon, a regeneration cut-off valve is usually required to be added on the oil return channel, when the negative pressure or the smaller positive pressure in the rodless cavity exists, the regeneration cut-off valve is in a throttling opening state, the oil return back pressure is increased, and the phenomena of suction front impact and the like caused by the fact that the bucket rod oil cylinder extends out too fast can be prevented; when the positive pressure in the rodless cavity is higher than the pressure, the regeneration cut-off valve is completely opened and is not throttled any more, so that the regeneration is released. However, when the throttle of the regeneration cut-off valve is opened, the oil return back pressure is high, the generated pressure loss is large, and the power loss is also large.
In contrast, the present embodiment provides a bucket rod control valve structure that does not require a regeneration shut-off valve. The bucket rod control valve structure is used for controlling a piston rod of a bucket rod oil cylinder 7 of the excavator to extend or retract, and then controlling the bucket rod to lift up or retract. The bucket rod is rotationally connected with a movable arm of the excavator, a cylinder body of the bucket rod oil cylinder 7 is installed on the movable arm of the excavator, a piston rod of the movable arm oil cylinder is rotationally connected with the bucket rod, and when the piston rod of the bucket rod oil cylinder 7 extends out, the bucket rod is retracted; when the piston rod of the bucket rod oil cylinder 7 retracts, the bucket rod is lifted.
FIG. 1 is a schematic diagram of a first spool in a working position A2 and a second spool in a working position B2 in an example of the stick control valve configuration of the present invention; FIG. 2 is a schematic diagram of a first spool in a working position A1 and a second spool in a working position B1 in an example of the stick control valve configuration of the present invention; FIG. 3 is a schematic diagram of a first spool in a working position A1 and a second spool in a working position B2 in an example of the stick control valve configuration of the present invention; FIG. 4 is a schematic diagram of a first spool in a working position A2 and a second spool in a working position B1 in an example of the stick control valve configuration of the present invention; fig. 5 is a schematic structural diagram of the arm control valve according to the embodiment of the present invention, in which the first valve spool is located at the operating position a3, and the second valve spool is located at the operating position B3. As shown in fig. 1 to 5, the arm control valve structure includes a first control valve, a second control valve, and a regeneration check valve 3.
The first control valve comprises a first valve core 11, the first control valve is provided with an input port A1, an oil return port A1, an output port A1 and an output port A2, the input port A1 is used for being communicated with a first pressure source, the oil return port A1 is used for being communicated with an oil tank, the output port A1 is used for being communicated with an oil port A, the output port A2 is used for being communicated with an oil port B, the oil port A is communicated with a rodless cavity 72 of the arm cylinder 7, and the oil port B is communicated with a rod cavity 71 of the arm cylinder 7. The first hydraulic pressure source is not shown in the drawing, and may be a fixed displacement pump or a variable displacement pump, which supplies hydraulic oil at a pressure of P1. The first valve spool 11 can be switched between a working position a1 and a working position a2, when the first valve spool 11 is located at the working position a1, the input port a1 is communicated with the output port a1, the oil return port a1 is communicated with the output port a2, at this time, hydraulic oil in the rod chamber 71 of the arm cylinder 7 can be returned to the oil tank through the first valve spool 11, hydraulic oil supplied by the first pressure source can be supplied to the rodless chamber 72 of the arm cylinder 7 through the first valve spool 11, and the piston rod of the arm cylinder 7 extends out. When the first valve spool 11 is located at the operating position a2, the input port a1, the oil return port a1, the output port a1, and the output port a2 are all closed, and there is no communication between the arm cylinder 7 and the first valve spool 11.
The second control valve includes a second spool 21, the first control valve has an input port B1, a regeneration port, an oil return port B1, an output port B1, and an output port B2, the input port B1 is used to communicate with a second pressure source, the oil return port B1 is used to communicate with a tank, the output port B1 is used to communicate with a port a, and the output port B2 is used to communicate with a port B, wherein the second pressure source is not shown in the drawing, and may be a fixed displacement pump or a variable displacement pump, which supplies hydraulic oil having a pressure of P2. The second valve spool 21 can be switched between a working position B1 and a working position B2, when the second valve spool 21 is located at a working position B1, the input port B1 and the output port B1 are communicated, the regeneration port and the output port B2 are communicated, and the oil return port B1 is disconnected, at this time, hydraulic oil supplied from the second pressure source can be supplied to the rodless chamber 72 of the arm cylinder 7 through the second valve spool 21, and the hydraulic oil in the rod chamber 71 of the arm cylinder 7 can also reach the regeneration port through the second valve spool 21; when the second spool 21 is located at the operating position B2, the input port B1, the regeneration port, the oil return port B1, the output port B1, and the output port B2 are all closed; at this time, the arm cylinder 7 and the second spool 21 are not in communication with each other.
It should be noted that the first control valve in this embodiment may be a three-position multi-way valve with four or more ports, and the second control valve may be a three-position multi-way valve with five or more ports.
And a regeneration check valve 3 disposed between the regeneration port and the input port B1, and allowing oil to flow only from the regeneration port to the input port B1, wherein when the second spool 21 is located at the operating position B1, if the oil pressure in the rod chamber 71 is greater than the oil pressure in the rodless chamber 72, the pressure oil in the rod chamber 71 of the arm cylinder 7 can be supplemented to the input port B1 through the second spool 21 and the regeneration check valve 3, and further supplemented to the rodless chamber 72, so as to prevent suction. The regenerative check valve 3 remains closed if the oil pressure in the rod chamber 71 is smaller than the oil pressure in the rod-less chamber 72. Therefore, the bucket rod control valve structure provided in the embodiment can effectively reduce the regeneration back pressure and improve the energy efficiency without adopting a regeneration cut-off valve in the prior art, and the regeneration oil passage can be arranged outside the second valve core 21, so that the regeneration flow rate is not influenced by the strength of the second valve core 21.
In this embodiment, the valve housing of the first control valve and the valve housing of the second control valve are integrally provided.
In this embodiment, the first valve spool 11 further has a working position A3, the working position a2 is located between the working position A3 and the working position a1, the first valve spool 11 can be switched between the working position a1, the working position a2, and the working position A3, when the first valve spool 11 is located at the working position A3, the input port a1 is communicated with the output port a2, the oil return port a1 is communicated with the output port a1, at this time, the hydraulic oil supplied by the first pressure source can be supplied to the rod chamber 71 of the arm cylinder 7 through the first valve spool 11, the hydraulic oil in the rodless chamber 72 of the arm cylinder 7 can be returned to the oil tank through the first valve spool 11, and the piston rod of the arm cylinder 7 retracts.
In the present embodiment, the second valve body 21 further has an operating position B3, an operating position B2 is located between the operating position B3 and the operating position B1, the second valve body 21 is switchable among the operating position B1, the operating position B2, and the operating position B3, when the second valve body 21 is located at the operating position B3, the input port B1 and the output port B2 are communicated, the oil return port B1 and the output port B2 are communicated, and the regeneration port is disconnected. At this time, the hydraulic oil supplied from the second pressure source may be supplied to the rod chamber 71 of the arm cylinder 7 through the second spool 21, and the hydraulic oil in the rod chamber 71 of the arm cylinder 7 may also flow back to the tank through the second spool 21, and the regenerative circuit is shut off.
In the present embodiment, the first control valve further includes a first pilot hydraulic control end 12, the first pilot hydraulic control end 12 is configured to drive the first valve spool 11 to move to the operating position a1, and the first pilot hydraulic control end 12 is supplied with pilot oil through a first oil supply device. The second control valve further comprises a second pilot hydraulic control end 22, the second pilot hydraulic control end 22 is used for driving the second valve spool 21 to move to the working position B1, and the second pilot hydraulic control end 22 is supplied with pilot oil through a second oil supply device. Different combinations can be realized because the first pilot hydraulic control end 12 and the second pilot hydraulic control end 22 adopt different oil supply devices to supply pilot oil. Such as: the first spool 11 of the first control valve is in the operating position a1 and the second spool 21 of the second control valve is in the operating position B1 or B2; the first spool 11 of the first control valve is in the operating position a2 and the second spool 21 of the second control valve is in the operating position B1 or B2.
Optionally, the first control valve further includes a third pilot hydraulic control end 13, the third pilot hydraulic control end 13 is used for driving the first valve spool 11 to move to the working position a3, the second control valve further includes a fourth pilot hydraulic control end 23, the fourth pilot hydraulic control end 23 is used for driving the second valve spool 21 to move to the working position B3, and the third pilot hydraulic control end 13 and the fourth pilot hydraulic control end 23 are both supplied with pilot oil through a third oil supply device. The third oil supply device supplies pilot oil to the third pilot hydraulic control end 13 and the fourth pilot hydraulic control end 23 at the same time, so that sufficient hydraulic power can be ensured when the bucket rod is lifted.
The arm control valve structure further includes a load holding valve 4, one end of the load holding valve 4 is communicated with the oil port B, and the other end of the load holding valve 4 is communicated with the output port a2 and the output port B2, respectively. The load maintaining valve 4 is a well-established technical means for ensuring the pressure in the rod chamber 71 of the arm cylinder 7 is stable.
Optionally, the arm control valve structure further includes a first on-off control valve 5 and a second on-off control valve 6, and the first on-off control valve 5 is disposed on a connection line between the first pressure source and the input port a1, and is configured to control connection or disconnection between the first pressure source and the input port a 1. The second on-off control valve 6 is provided on a connection line between the second pressure source and the input port B1, and is used to control the connection or disconnection between the second pressure source and the input port B1.
Optionally, the arm control valve structure further includes a first electric proportional flow valve disposed on an oil supply line of the first pilot hydraulic control end 12. The arm control valve structure further includes a second electro-proportional flow valve disposed on the oil supply line of the second pilot hydraulic control end 22. The signal oil pressure supplied to the first pilot hydraulic control port 12 can be regulated by a first electrically controlled proportional flow valve, and the signal oil pressure supplied to the second pilot hydraulic control port 22 can be regulated by a second electrically controlled proportional flow valve.
The operating principle of the arm control valve structure that this embodiment provided is as follows:
1. an initial state.
As shown in fig. 1, at this time, no pilot oil is input to both the first pilot hydraulic control port 12 and the third pilot hydraulic control port 13 of the first control valve, the first spool 11 of the first control valve is located at the operating position a2, no pilot oil is input to both the second pilot hydraulic control port 22 and the fourth pilot hydraulic control port 23, the second spool 21 of the second control valve is located at the operating position B2, the position of the piston rod of the arm cylinder 7 is kept unchanged, and the position of the arm is kept unchanged.
2. And (5) recovering the bucket rod.
Bucket rod recovery is specifically divided into three cases: the first and second control valves operate in tandem, with only the first control valve operating and only the second control valve operating.
The first control valve and the second control valve operate in cooperation. As shown in fig. 2, at this time, the first pilot hydraulic control end 12 of the first control valve has pilot oil input, the third pilot hydraulic control end 13 has no pilot oil input, and the first spool 11 is located at the operating position a 1; the second pilot hydraulic control port 22 of the second control valve has a pilot oil input, the fourth pilot hydraulic control port 23 has no pilot oil input, and the second spool 21 is located at the operating position B1. At this time, the hydraulic oil supplied from the first pressure source may be supplied to the no-rod chamber 72 of the arm cylinder 7 through the first spool 11, the hydraulic oil supplied from the second pressure source may be supplied to the no-rod chamber 72 of the arm cylinder 7 through the second spool 21, the rod chamber 71 of the arm cylinder 7 communicates with the tank, and the rod chamber 71 of the arm cylinder 7 communicates with the regeneration port. When the oil pressure of the rod chamber 71 is higher than the oil pressure of the rodless chamber 72, the regenerative check valve 3 is opened, a part of the hydraulic oil in the rod chamber 71 of the arm cylinder 7 is returned to the oil tank through the first spool 11, and another part of the hydraulic oil in the rod chamber 71 of the arm cylinder 7 is replenished to the input port B1 through the second spool 21 and the regenerative check valve 3, and is supplied to the rodless chamber 72 through the second spool 21. When the oil pressure of the rod chamber 71 is lower than the oil pressure of the rodless chamber 72, the regenerative check valve 3 is closed, all the hydraulic oil in the rod chamber 71 of the arm cylinder 7 flows back to the oil tank through the first valve element 11, and the piston rod of the arm cylinder 7 extends.
Only the first control valve operates. As shown in fig. 3, at this time, the first pilot hydraulic control end 12 of the first control valve has pilot oil input, the third pilot hydraulic control end 13 has no pilot oil input, and the first spool 11 is located at the operating position a 1; neither the second pilot hydraulic control port 22 nor the fourth pilot hydraulic control port 23 of the second control valve has pilot oil input, and the second spool 21 is located at the operating position B2. At this time, the hydraulic oil supplied from the first pressure source may be supplied to the rodless chamber 72 of the arm cylinder 7 through the first spool 11, all of the hydraulic oil in the rod chamber 71 of the arm cylinder 7 is returned to the oil tank through the first spool 11, and the piston rod of the arm cylinder 7 is extended.
Only the second control valve operates.
As shown in fig. 4, at this time, the first pilot hydraulic control end 12 and the third pilot hydraulic control end 13 of the first control valve have no pilot oil input, the first spool 11 is located at the operating position a2, the second pilot hydraulic control end 22 of the second control valve has a pilot oil input, the fourth pilot hydraulic control end 23 has no pilot oil input, and the second spool 21 is located at the operating position B1. The hydraulic oil supplied from the second pressure source may be supplied to the rodless chamber 72 of the arm cylinder 7 through the second valve spool 21, and since the hydraulic oil in the rod chamber 71 can only be discharged through the regenerative check valve 3, regardless of the oil pressure in the rod chamber 71 and the oil pressure in the rodless chamber 72, the regenerative check valve 3 is forcibly opened, and the entire hydraulic oil in the rod chamber 71 of the arm cylinder 7 flows into the input port B1 through the second valve spool 21 and the regenerative check valve 3, and is further supplied to the rodless chamber 72 through the second valve spool 21, and the piston rod of the arm cylinder 7 extends.
3. The bucket rod is raised.
As shown in fig. 5, at this time, the first pilot hydraulic control port 12 of the first control valve has no pilot oil input, the third pilot hydraulic control port 13 has a pilot oil input, the first spool 11 is located at the operating position a3, the second pilot hydraulic control port 22 of the second control valve has no pilot oil input, the fourth pilot hydraulic control port 23 has a pilot oil input, and the second spool 21 is located at the operating position B3. At this time, the hydraulic oil supplied from the first pressure source may be supplied to the rod chamber 71 of the arm cylinder 7 through the first spool 11, the hydraulic oil supplied from the second pressure source may be supplied to the rod chamber 71 of the arm cylinder 7 through the second spool 21, the hydraulic oil in the rod-less chamber 72 of the arm cylinder 7 may return to the oil tank through the first spool 11 and the second spool 21, and the piston rod of the arm cylinder 7 is retracted.
The embodiment also provides a excavator, which comprises the bucket rod control valve structure in the scheme.
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.
Claims (10)
1. A bucket rod control valve structure, comprising:
the first control valve comprises a first valve core (11), the first control valve is provided with an input port A1, an oil return port A1, an output port A1 and an output port A2, the input port A1 is used for being communicated with a first pressure source, an oil return port A1 is used for being communicated with an oil tank, an output port A1 is used for being communicated with an oil port A, the output port A2 is used for being communicated with an oil port B, the oil port A is communicated with a rodless cavity (72) of an arm cylinder (7), the oil port B is communicated with a rod cavity (71) of the arm cylinder (7), the first valve core (11) can be switched between a working position A1 and a working position A2, when the first valve core (11) is located at the working position A1, the input port A1 is communicated with the output port A1, and the oil return port A1 is communicated with the output port A2; when the first valve spool (11) is located at the working position A2, the input port A1, the oil return port A1, the output port A1 and the output port A2 are all closed;
the second control valve comprises a second valve core (21), the first control valve is provided with an input port B1, a regeneration port, an oil return port B1, an output port B1 and an output port B2, the input port B1 is used for being communicated with a second pressure source, an oil return port B1 is used for being communicated with an oil tank, the output port B1 is used for being communicated with the oil port A, the output port B2 is used for being communicated with the oil port B, the second valve core (21) can be switched between a working position B1 and a working position B2, when the second valve core (21) is located at the working position B1, the input port B1 is communicated with the output port B1, the regeneration port is communicated with the output port B2, and the oil return port B1 is disconnected; when the second valve spool (21) is located at the working position B2, the input port B1, the regeneration port, the oil return port B1, the output port B1 and the output port B2 are all closed;
a regeneration check valve (3) disposed between the regeneration port and the input port B1 and allowing oil to flow only from the regeneration port to the input port B1.
2. The arm control valve arrangement according to claim 1, wherein the first control valve further comprises a first pilot hydraulic control port (12), the first pilot hydraulic control port (12) being adapted to drive the first spool (11) to move to the operating position a1, the first pilot hydraulic control port (12) being supplied with pilot oil by a first oil supply.
3. The arm control valve structure of claim 2, further comprising a first electro-proportional flow valve disposed on an oil supply line of the first pilot hydraulic control port (12).
4. The arm control valve arrangement according to claim 1, wherein the second control valve further comprises a second pilot hydraulic control end (22), the second pilot hydraulic control end (22) being configured to drive the second spool (21) to move to the operating position B1, the second pilot hydraulic control end (22) being supplied with pilot oil by a second oil supply.
5. The arm control valve structure of claim 4, further comprising a second electro-proportional flow valve disposed on an oil supply line of the second pilot hydraulic control port (22).
6. The arm control valve structure according to claim 1, wherein the first valve spool (11) further has a working position A3, the working position a2 is located between the working position A3 and the working position a1, the first valve spool (11) is switchable among the working position a1, the working position a2, and the working position A3, when the first valve spool (11) is located at the working position A3, the input port a1 is communicated with the output port a2, and the return port a1 is communicated with the output port a 1.
7. The arm control valve structure according to claim 6, wherein the second spool (21) further has a working position B3, the working position B2 is located between the working position B3 and the working position B1, the second spool (21) is switchable among the working position B1, the working position B2, and the working position B3, when the second spool (21) is located at the working position B3, the input port B1 and the output port B2 are communicated, the return port B1 and the output port B2 are communicated, and the regeneration port is disconnected.
8. The arm control valve arrangement according to claim 7, wherein the first control valve further comprises a third pilot hydraulic control end (13), the third pilot hydraulic control end (13) being adapted to drive the first spool (11) to move to the operating position A3, the second control valve further comprises a fourth pilot hydraulic control end (23), the fourth pilot hydraulic control end (23) being adapted to drive the second spool (21) to move to the operating position B3, the third pilot hydraulic control end (13) and the fourth pilot hydraulic control end (23) each being supplied with pilot oil by a third oil supply.
9. The arm control valve structure according to claim 1, further comprising a load holding valve (4), one end of the load holding valve (4) communicating with the oil port B, and the other end of the load holding valve (4) communicating with the output port a2 and the output port B2, respectively.
10. A shovel comprising the stick control valve arrangement of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111670124.7A CN114321044A (en) | 2021-12-31 | 2021-12-31 | Bucket rod control valve structure and excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111670124.7A CN114321044A (en) | 2021-12-31 | 2021-12-31 | Bucket rod control valve structure and excavator |
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| Publication Number | Publication Date |
|---|---|
| CN114321044A true CN114321044A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111670124.7A Pending CN114321044A (en) | 2021-12-31 | 2021-12-31 | Bucket rod control valve structure and excavator |
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| Country | Link |
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| CN (1) | CN114321044A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111910708A (en) * | 2020-09-07 | 2020-11-10 | 雷沃工程机械集团有限公司 | Excavator bucket rod hydraulic system, excavator and method |
| CN113482089A (en) * | 2021-07-13 | 2021-10-08 | 徐工集团工程机械股份有限公司 | Flow regeneration valve group, hydraulic system and excavator |
| CN113606203A (en) * | 2021-08-16 | 2021-11-05 | 潍柴动力股份有限公司 | Bucket rod hydraulic system and excavator |
| CN113819105A (en) * | 2021-11-25 | 2021-12-21 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic system for electrically proportional controlling multi-working-position valve and control method thereof |
-
2021
- 2021-12-31 CN CN202111670124.7A patent/CN114321044A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111910708A (en) * | 2020-09-07 | 2020-11-10 | 雷沃工程机械集团有限公司 | Excavator bucket rod hydraulic system, excavator and method |
| CN113482089A (en) * | 2021-07-13 | 2021-10-08 | 徐工集团工程机械股份有限公司 | Flow regeneration valve group, hydraulic system and excavator |
| CN113606203A (en) * | 2021-08-16 | 2021-11-05 | 潍柴动力股份有限公司 | Bucket rod hydraulic system and excavator |
| CN113819105A (en) * | 2021-11-25 | 2021-12-21 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic system for electrically proportional controlling multi-working-position valve and control method thereof |
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