CN216867112U - Hydraulic control system and working machine - Google Patents
Hydraulic control system and working machine Download PDFInfo
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- CN216867112U CN216867112U CN202220394686.7U CN202220394686U CN216867112U CN 216867112 U CN216867112 U CN 216867112U CN 202220394686 U CN202220394686 U CN 202220394686U CN 216867112 U CN216867112 U CN 216867112U
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Abstract
The utility model relates to the field of hydraulic control, and provides a hydraulic control system and an operating machine, wherein the hydraulic control system comprises: the first oil inlet is connected with the oil supply port, the first oil outlet is connected with the first working system, the second oil outlet is connected with the second working system, the third oil outlet is connected with the first load sensitive oil port, the fourth oil outlet is connected with the second load sensitive oil port, and the first oil inlet is connected with the first oil outlet. The defect that the pump source cannot output matched flow according to different working conditions is overcome. According to the hydraulic control system, when the switching valve group works in the first working system, the first load sensitive oil port is connected with the second load sensitive oil port, and when the switching valve group works in the second working system, the switching valve group controls the load sensitive pump source to supply oil to the second working system at a constant pressure, so that the pressure flow is matched as required in the working process of the first working system, the response speed of the second working system is guaranteed, and high efficiency and energy conservation are realized.
Description
Technical Field
The utility model relates to the technical field of hydraulic control, in particular to a hydraulic control system and an operating machine.
Background
At present, an existing working machine, such as a mining dump truck, generally includes a hydraulic lifting system and a hydraulic steering system, where the hydraulic lifting system is often composed of elements such as a lifting pump, a lifting valve, a balance valve, a pilot valve, and a multi-stage cylinder, and the hydraulic steering system is often composed of elements such as a steering pump, a priority valve, a steering gear, and a steering cylinder. A lifting system and a steering system of a hydraulic system of the existing mining dump truck are respectively provided with a pump as a hydraulic energy source, or two pumps are combined, or each pump is used independently.
The lifting system and the steering system respectively use hydraulic pumps as hydraulic power sources, wherein the lifting system mostly adopts a constant delivery pump which can not output matched flow according to the requirement of load, redundant flow overflows, and a large amount of energy is wasted due to a large amount of overflow under pressure change, so that the energy conservation and the environmental protection are not facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model provides a hydraulic control system and an operation machine, which are used for solving the defect that a pump source cannot output matched flow according to the requirements of different working systems because a hydraulic control system controls a plurality of working systems to act in the prior art, and controlling a load sensitive pump source to provide matched flow according to the action requirements of different working systems by switching a valve group, so that redundant overflow is avoided, and energy waste is reduced.
The present invention provides a hydraulic control system, including:
the load-sensitive pump source comprises a first load-sensitive oil port and an oil supply port;
the switching valve group comprises a first oil inlet, a first oil outlet, a second oil outlet, a third oil outlet and a fourth oil outlet, the first oil inlet is connected with the oil supply port, the first oil outlet is used for being connected with a first working system, the second oil outlet is used for being connected with a second working system, the third oil outlet is connected with the first load sensitive oil port, the fourth oil outlet is used for being connected with a second load sensitive oil port of the first working system, and the first oil inlet is connected with the first oil outlet;
the switching valve group is switched between a first working state and a second working state, and the third oil outlet is connected with the fourth oil outlet in the first working state; in the second working state, the oil supply port is respectively connected with the second oil outlet and the third oil outlet, and the fourth oil outlet is unloaded.
According to the hydraulic control system provided by the utility model, the switching valve group further comprises a second oil inlet, the second oil inlet is used for being connected with an emergency pump, and the second oil inlet is connected with the first oil outlet.
According to the hydraulic control system provided by the utility model, the switching valve group comprises a shuttle valve, the shuttle valve comprises a third oil inlet, a fourth oil inlet and a fifth oil outlet, the third oil inlet is connected with the first oil inlet, the fourth oil inlet is connected with the second oil inlet, and the fifth oil outlet is connected with the first oil outlet.
According to the hydraulic control system provided by the utility model, the switching valve group further comprises an overflow valve, an oil inlet of the overflow valve is connected with the second oil inlet, and an oil outlet of the overflow valve is connected with an oil tank of the hydraulic control system.
According to the hydraulic control system provided by the utility model, the switching valve group comprises a reversing valve and a logic valve, the reversing valve comprises a first working position and a second working position, the reversing valve is respectively connected with the first oil inlet, an external control port of the logic valve, the third oil outlet and the fourth oil outlet, an oil inlet of the logic valve is connected with the first oil inlet, and an oil outlet of the logic valve is connected with the second oil outlet;
in the first working state, the first oil inlet is communicated with the external control port of the logic valve through the first working position, the oil inlet and the oil outlet of the logic valve are disconnected, and the third oil outlet is communicated with the fourth oil outlet through the first working position;
in the second working state, the first oil inlet is communicated with the third oil outlet through the second working position, the external control port of the logic valve is communicated with the fourth oil outlet, and the first oil inlet is communicated with the second oil outlet through the logic valve.
According to the hydraulic control system provided by the utility model, the load-sensitive pump source comprises a variable pump, a variable cylinder, a load-sensitive valve and a pressure compensation valve, wherein the variable pump is connected with the variable cylinder, and the variable cylinder is connected with the load-sensitive valve and the pressure compensation valve;
the oil outlet of the variable pump is the oil supply port, and the load sensitive valve is provided with the first load sensitive oil port.
According to the hydraulic control system provided by the utility model, the filter is arranged between the first oil inlet and the oil supply port.
According to the hydraulic control system provided by the utility model, the reversing valve is a two-position four-way electromagnetic reversing valve.
According to the hydraulic control system provided by the utility model, the reversing valve comprises a first oil port, a second oil port, a third oil port and a fourth oil port, the first oil port is connected with the first oil inlet, the second oil port is connected with an external control port of the logic valve, the third oil port is connected with the third oil outlet, and the fourth oil port is connected with the fourth oil outlet;
in the first working state, the first oil port is communicated with the second oil port, and the third oil port is connected with the fourth oil port; and in the second working state, the first oil port is connected with the third oil port, and the second oil port is connected with the fourth oil port.
The utility model also provides a working machine comprising the hydraulic control system.
According to the hydraulic control system, the load sensitive pump source is adopted to supply oil to the first working system and the second working system, and the first load sensitive oil port is connected with the second load sensitive oil port through the switching valve group in the working state of the first working system, so that the load sensitive pump source can provide matched flow based on the requirement of the first working system, and energy waste caused by excessive overflow is avoided; the switching valve group enables the first load sensitive oil port to be invalid when the second working system works, controls the load sensitive pump source to supply oil to the second working system at a constant pressure, and further achieves the matching of pressure flow of the first working system in the working process according to requirements, so that the response speed of the second working system is guaranteed, and the high-efficiency and energy-saving effects are achieved.
Further, the work machine according to the present invention includes the hydraulic control system as described above, and therefore, also has various advantages as described above.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a hydraulic schematic of a hydraulic control system provided by the present invention;
FIG. 2 is a schematic diagram of a switching valve block provided by the present invention;
reference numerals:
100: a load-sensitive pump source; 101: an oil supply port; 102: a first load-sensitive oil port; 103: an oil tank; 104: a filter; 110: a variable displacement pump; 111: a variable cylinder; 112: a load sensitive valve; 113: a compensation valve;
200: switching valve groups; 201: a first oil inlet; 202: a first oil outlet; 203: a second oil outlet; 204: a third oil outlet; 205: a fourth oil outlet; 206: a second oil inlet; 210: a first working system; 211: a second load-sensitive oil port; 220: a second working system; 230: an emergency pump; 240: a diverter valve; 241: a first oil port; 242: a second oil port; 243: a third oil port; 244: a fourth oil port; 250: a logic valve; 251: an external control port; 260: a shuttle valve; 261: a third oil inlet; 262: a fourth oil inlet; 263: a fifth oil outlet; 270: an overflow valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious 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 embodiments of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
An embodiment of the present invention will be described below with reference to fig. 1 to 2. It is to be understood that the following description is only exemplary embodiments of the present invention and is not intended to limit the present invention.
As shown in fig. 1, the present invention provides a hydraulic control system including: the system comprises a load-sensitive pump source 100 and a switching valve group 200, wherein the switching valve group 200 is respectively connected with a first working system 210 and a second working system 220, and when the load-sensitive pump source 100 independently supplies oil to the first working system 210 through switching of the switching valve group 200, the load-sensitive pump source 100 matches and adjusts output flow based on a load-sensitive feedback signal of the first working system 210, so that waste caused by excessive overflow is avoided.
Specifically, the load sensitive pump source 100 includes a first load sensitive oil port 102 and an oil supply port 101; the switching valve group 200 comprises a first oil inlet 201, a first oil outlet 202, a second oil outlet 203, a third oil outlet 204 and a fourth oil outlet 205, wherein the first oil inlet 201 is connected with the oil supply port 101, the first oil outlet 202 is used for being connected with a first working system 210, and the second oil outlet 203 is used for being connected with a second working system 220. The third oil outlet 204 is connected with the first load-sensitive oil port 102, the fourth oil outlet 205 is used for being connected with the second load-sensitive oil port 211 of the first working system 210, wherein the first oil inlet 201 is connected with the first oil outlet 202.
The switching valve group is switched between a first working state and a second working state, and in the first working state, the third oil outlet 204 is connected with the fourth oil outlet 205; in the second working state, the oil supply port 101 is connected with the second oil outlet 203 and the third oil outlet 204, respectively, and the fourth oil outlet 205 is unloaded.
In other words, in the first operation state, the first operation system 210 is operated, and the second operation system 220 is not operated. The working flow of the first working system 210 is smaller than that of the second working system 220, and the connection of the third oil outlet 204 and the fourth oil outlet 205 is equivalent to the connection of the first load-sensitive oil port 102 and the second load-sensitive oil port 211 of the first working system 210. The load-sensitive signal of the first working system 210 is fed back to the load-sensitive pump source 100, and the load-sensitive pump source 100 controls the flow rate of the output hydraulic oil based on the load-sensitive signal, so that the working flow rate of the first working system 210 is matched, and the energy waste caused by overflow of excessive flow rate is avoided.
In the second operating state, the second operating system 220 operates, the first operating system 210 may operate simultaneously with the second operating system 220, and of course, the first operating system 210 may not operate. That is, the oil supply port 101 is connected to the first working system 210 and the second working system 220, and meanwhile, the oil supply port 101 is connected to the first load sensing oil port 102, so that the load sensing adjustment is not performed, and the second load sensing oil port 211 is not connected to the load sensing pump source 100, so that the unloading is directly performed. The load sensitive pump source 100 is fully-displaced to provide oil to the first and second operating systems 210 and 220 in a constant pressure operating mode.
With continued reference to fig. 1, in an embodiment of the present invention, the switching valve set 200 further comprises a second oil inlet 206, the second oil inlet 206 is configured to be connected with the emergency pump 230, and the second oil inlet 206 is connected with the first oil outlet 202. In other words, the emergency pump 230 is added to the hydraulic control system to provide a backup pump source for the first working system 210, and when the load sensitive pump source 100 fails, the emergency pump 230 may be used to supply oil to the first working system 210 to provide an oil source for emergency operation.
Further, in another embodiment of the present invention, the emergency pump 230 requires overload protection for the emergency pump 230 of the present invention. Therefore, the switching valve set 200 further comprises an overflow valve 270, an oil inlet of the overflow valve 270 is connected with the second oil inlet 206, and an oil outlet of the overflow valve 270 is connected with the oil tank 103 of the hydraulic control system. That is, the oil inlet of the relief valve 270 is connected to the emergency pump 230, and overload protection is performed on the emergency pump 230 to overflow the excessive flow into the oil tank 103, thereby maintaining the safe and stable output pressure of the emergency pump 230.
In addition, as shown in fig. 2, in other embodiments of the present invention, the switching valve set 200 includes a shuttle valve 260, the shuttle valve 260 includes a third oil inlet 261, a fourth oil inlet 262 and a fifth oil outlet 263, the third oil inlet 261 is connected with the first oil inlet 201, the fourth oil inlet 262 is connected with the second oil inlet 206, and the fifth oil outlet 263 is connected with the first oil outlet 202. In other words, the hydraulic oil of the load-sensitive pump source 100 flows from the oil supply port 101 to the first working system 210 in one direction, and the hydraulic oil of the emergency pump 230 flows from the emergency pump 230 to the first working system 210 in one direction.
As shown in fig. 2, in a preferred embodiment of the present invention, the switching valve set 200 includes a direction valve 240 and a logic valve 250, the direction valve 240 includes a first working position and a second working position, and the direction valve 240 is connected to the first oil inlet 201, the external control port 251 of the logic valve 250, the third oil outlet 204 and the fourth oil outlet 205 respectively. The oil inlet of the logic valve 250 is connected with the first oil inlet 201, and the oil outlet of the logic valve 250 is connected with the second oil outlet 203.
In other words, for the logic valve 250 of the present invention, the logic valve 250 includes an inner control port and an outer control port 251, and the oil pressure of the inner control port is compared with the sum of the oil pressure of the outer control port 251 and the spring force, so as to switch the oil inlet and the oil outlet of the logic valve 250 between on and off states. When the oil pressure of the inner control port is larger than the sum of the oil pressure of the outer control port 251 and the spring force, the oil inlet and the oil outlet of the logic valve 250 are communicated. That is, the oil supply port 101 is connected to the second oil outlet 203, i.e., the load-sensitive pump source 100 supplies the second working system 220 with oil.
When the oil pressure of the inner control port is smaller than the sum of the oil pressure of the outer control port 251 and the spring force, the oil inlet and the oil outlet of the logic valve 250 are disconnected. That is, the oil supply port 101 is not communicated with the second oil outlet 203, and the second working system 220 does not work; wherein the internal control port of the logic valve 250 is in pressure communication with the fuel supply port 101.
In the first working state, the first oil inlet 201 is communicated with the outer control port 251 of the logic valve 250 through a first working position, the oil inlet and the oil outlet of the logic valve 250 are disconnected, and the third oil outlet 204 is communicated with the fourth oil outlet 205 through the first working position.
In the second working state, the first oil inlet 201 is communicated with the third oil outlet 204 through the second working position, the outer control port 251 of the logic valve 250 is communicated with the fourth oil outlet 205, and the first oil inlet 201 is communicated with the second oil outlet 203 through the logic valve 250.
For the reversing valve 240 of the present invention, when the reversing valve 240 is in the first working position, the oil supply port 101 is communicated with the external control port 251 of the logic valve 250, and the second load-sensitive oil port 211 of the second working system 220 is connected to the first load-sensitive oil port 102, so that the first working system 210 works, the load-sensitive pump source 100 regulates and controls the output flow based on the requirement of the first working system 210, and the second working system 220 does not work.
When the reversing valve 240 is in the second working position, the oil supply port 101 is connected to the first load-sensitive oil port 102, so that the load-sensitive pump source 100 is controlled at a constant pressure, the external control port 251 of the logic valve 250 is connected to the second load-sensitive oil port 211 for unloading, the first oil inlet 201 is communicated with the second oil outlet 203, and the oil supply port 101 supplies oil to the second working system 220, so that the second working system 220 works, and meanwhile, the first working system 210 can also act.
Further, in another preferred embodiment of the present invention, the direction valve 240 is a two-position four-way electromagnetic direction valve 240.
For the two-position four-way electromagnetic directional valve 240 of the present invention, the two-position four-way electromagnetic directional valve 240 includes a first oil port 241, a second oil port 242, a third oil port 243 and a fourth oil port 244, the first oil port 241 is connected to the first oil inlet 201, the second oil port 242 is connected to the external control port 251 of the logic valve 250, the third oil port 243 is connected to the third oil outlet 204, and the fourth oil port 244 is connected to the fourth oil outlet 205.
In a first working state, that is, in a state where the direction valve 240 is in the first working position, the first oil port 241 is communicated with the second oil port 242, and the third oil port 243 is connected with the fourth oil port 244; in the second working state, that is, the direction valve 240 is in the second working position, the first oil port 241 is connected to the third oil port 243, and the second oil port 242 is connected to the fourth oil port 244.
As shown in fig. 1, in some embodiments of the present invention, the load-sensitive pump source 100 includes a variable pump 110, a variable cylinder 111, a load-sensitive valve 112, and a pressure-compensating valve 113, the variable pump 110 being connected to the variable cylinder 111, the variable cylinder 111 being connected to the load-sensitive valve 112 and the pressure-compensating valve 113; the oil outlet of the variable displacement pump 110 is an oil supply port 101, and a first load sensitive oil port 102 is formed in the load sensitive valve 112. The variable displacement pump 110 may be a plunger pump.
Further, in other embodiments of the present invention, the hydraulic control system further includes a filter 104, the filter 104 is disposed between the first oil inlet 201 and the oil supply port 101, the filter 104 is used to protect components downstream of the filter, and the filter can be used in combination with a filter of the oil return path to improve the filtering efficiency. . And is provided with a check valve connected in parallel with the filter 104, which is opened when the filter 104 is clogged.
The utility model also provides a working machine comprising the hydraulic control system of the embodiment. The working machine can be an engineering machine such as a crane, an excavator, a pile machine and the like, or an engineering vehicle such as a climbing vehicle, a fire truck, a mining dump truck and the like.
For example, in a mining dump truck with the hydraulic control system of the present invention, the first working system 210 is a steering system, the second working system 220 is a lifting system, and the second load-sensitive oil port 211 is a steering gear load-sensitive port in the steering system.
In the process of steering of the steering system, the reversing valve 240 is powered off, the oil supply port 101 supplies oil to the steering system when the reversing valve 240 is in the first working position, and the steering gear load sensing port is connected with the first load sensing oil port 102. The load sensitive pump source 100 performs flow regulation based on the signal from the steering gear load sensitive port of the steering system to match the flow required by the steering system.
In the lifting process of the lifting system, the reversing valve 240 is powered on, the oil supply port 101 supplies oil to the lifting system when the reversing valve 240 is in the second working position, the load sensitive port of the steering gear is connected with the external control port 251 of the logic valve 250, the oil supply port 101 is connected with the first load sensitive oil port 102, and the load sensitive pump source 100 outputs constant pressure. Meanwhile, when the lifting system lifts, the steering system can also perform steering action. The pressure and flow matching in the steering process is met according to requirements, the response speed of lifting is considered, and the device is efficient and energy-saving.
According to the hydraulic control system provided by the utility model, the load-sensitive pump source 100 is adopted to supply oil to the first working system 210 and the second working system 220, and the first load-sensitive oil port 102 is connected with the second load-sensitive oil port 211 in the working state of the first working system 210 through the switching valve group 200, so that the load-sensitive pump source 100 can provide matched flow based on the requirement of the first working system 210, and energy waste caused by excessive overflow is avoided; when the second working system 220 works, the switching valve group 200 disables the first load-sensitive oil port 102, controls the load-sensitive pump source 100 to supply oil to the second working system 220 at a constant pressure, and further achieves the purpose of matching pressure and flow in the working process of the first working system 210 according to requirements, thereby ensuring the response speed of the second working system 220, and being efficient and energy-saving.
Further, the present invention provides a working machine having the above-described hydraulic control system, and therefore having various advantages as described above.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A hydraulic control system, comprising:
the load-sensitive pump source comprises a first load-sensitive oil port and an oil supply port;
the switching valve group comprises a first oil inlet, a first oil outlet, a second oil outlet, a third oil outlet and a fourth oil outlet, the first oil inlet is connected with the oil supply port, the first oil outlet is used for being connected with a first working system, the second oil outlet is used for being connected with a second working system, the third oil outlet is connected with the first load sensitive oil port, the fourth oil outlet is used for being connected with a second load sensitive oil port of the first working system, and the first oil inlet is connected with the first oil outlet;
the switching valve group is switched between a first working state and a second working state, and the third oil outlet is connected with the fourth oil outlet in the first working state; in the second working state, the oil supply port is respectively connected with the second oil outlet and the third oil outlet, and the fourth oil outlet is unloaded.
2. The hydraulic control system of claim 1, wherein the switching valve block further comprises a second oil inlet for connection with an emergency pump, the second oil inlet being connected with the first oil outlet.
3. The hydraulic control system of claim 2, wherein the switching valve block includes a shuttle valve, the shuttle valve including a third oil inlet, a fourth oil inlet, and a fifth oil outlet, the third oil inlet being connected to the first oil inlet, the fourth oil inlet being connected to the second oil inlet, the fifth oil outlet being connected to the first oil outlet.
4. The hydraulic control system of claim 2, wherein the switching valve set further comprises an overflow valve, an oil inlet of the overflow valve is connected to the second oil inlet, and an oil outlet of the overflow valve is connected to an oil tank of the hydraulic control system.
5. The hydraulic control system of claim 1, wherein the switching valve set includes a directional valve and a logic valve, the directional valve includes a first working position and a second working position, the directional valve is connected to the first oil inlet, the external control port of the logic valve, the third oil outlet and the fourth oil outlet, the oil inlet of the logic valve is connected to the first oil inlet, and the oil outlet of the logic valve is connected to the second oil outlet;
in the first working state, the first oil inlet is communicated with the external control port of the logic valve through the first working position, the oil inlet and the oil outlet of the logic valve are disconnected, and the third oil outlet is communicated with the fourth oil outlet through the first working position;
in the second working state, the first oil inlet is communicated with the third oil outlet through the second working position, the external control port of the logic valve is communicated with the fourth oil outlet, and the first oil inlet is communicated with the second oil outlet through the logic valve.
6. The hydraulic control system of claim 1, wherein the load sensitive pump source includes a variable displacement pump, a variable displacement cylinder, a load sensitive valve, and a pressure compensating valve, the variable displacement pump being connected to the variable displacement cylinder, the variable displacement cylinder being connected to the load sensitive valve and the pressure compensating valve;
the oil outlet of the variable pump is the oil supply port, and the load sensitive valve is provided with the first load sensitive oil port.
7. The hydraulic control system of claim 1, further comprising a filter disposed between the first oil inlet and the oil supply port.
8. The hydraulic control system of claim 5, wherein the directional control valve is a two-position, four-way solenoid directional control valve.
9. The hydraulic control system of claim 8, wherein the directional control valve includes a first port, a second port, a third port, and a fourth port, the first port is connected to the first oil inlet, the second port is connected to an external control port of the logic valve, the third port is connected to the third oil outlet, and the fourth port is connected to the fourth oil outlet;
in the first working state, the first oil port is communicated with the second oil port, and the third oil port is connected with the fourth oil port; and in the second working state, the first oil port is connected with the third oil port, and the second oil port is connected with the fourth oil port.
10. A work machine, characterized by comprising a hydraulic control system according to any one of claims 1 to 9.
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| CN202220394686.7U CN216867112U (en) | 2022-02-25 | 2022-02-25 | Hydraulic control system and working machine |
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| CN202220394686.7U CN216867112U (en) | 2022-02-25 | 2022-02-25 | Hydraulic control system and working machine |
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