CN219413075U - Hydraulic control system and working machine - Google Patents
Hydraulic control system and working machine Download PDFInfo
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- CN219413075U CN219413075U CN202320486669.0U CN202320486669U CN219413075U CN 219413075 U CN219413075 U CN 219413075U CN 202320486669 U CN202320486669 U CN 202320486669U CN 219413075 U CN219413075 U CN 219413075U
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Abstract
The utility model relates to the technical field of hydraulic systems, and provides a hydraulic control system and a working machine. In the hydraulic control system, an oil outlet of a hydraulic pump is connected with an oil tank through an unloading control valve. The unloading control valve is used for controlling the communication state of the oil outlet of the hydraulic pump and the oil tank. The oil inlet of the hydraulic motor is connected with the oil outlet of the hydraulic pump. The pressure detection device is arranged at an oil inlet of the hydraulic motor. The control device is connected with the pressure detection device and the unloading control valve. The control device is used for controlling the working state of the unloading control valve based on the detection result of the pressure detection device. Through the structure, when the hydraulic motor fails and the pressure of the oil inlet of the hydraulic motor exceeds the standard, the oil outlet of the hydraulic pump is directly communicated with the oil tank. Therefore, the safety overflow power loss of the hydraulic control system can be greatly reduced, and the energy-saving performance is good.
Description
Technical Field
The utility model relates to the technical field of hydraulic systems, in particular to a hydraulic control system and a working machine.
Background
Paver is an extremely important road construction machine. The paver is provided with a screed plate which is used for pre-flattening paving materials. Currently, a hydraulic vibrating system is used for driving a screed plate to perform a pre-pressing operation. In the existing vibrating hydraulic control system, a safety overflow valve is usually arranged, and when a vibrating motor fails, a hydraulic pump opens the safety overflow valve and releases pressure. The pressure relief mode has overflow power loss, and the energy conservation is poor.
Disclosure of Invention
The utility model provides a hydraulic control system and a working machine, which are used for solving or improving the problems of overflow power loss and poor energy conservation of the existing safe pressure relief mode of a vibrating hydraulic system.
According to a first aspect of the present utility model, there is provided a hydraulic control system including a hydraulic pump, an unloading control valve, a hydraulic motor, a pressure detecting device, a control device, and an oil tank.
And an oil outlet of the hydraulic pump is connected with the oil tank through the unloading control valve. The unloading control valve is used for controlling the communication state of the oil outlet of the hydraulic pump and the oil tank. And an oil inlet of the hydraulic motor is connected with an oil outlet of the hydraulic pump. The pressure detection device is arranged at an oil inlet of the hydraulic motor. The control device is connected with the pressure detection device and the unloading control valve. The control device is used for controlling the working state of the unloading control valve based on the detection result of the pressure detection device.
According to the hydraulic control system provided by the utility model, the unloading control valve comprises an unloading position and an unloading stop position.
In the unloading position state, an oil outlet of the hydraulic pump is communicated with the oil tank; and in the unloading stop position state, the oil outlet of the hydraulic pump is stopped with the oil tank.
According to the hydraulic control system provided by the utility model, the hydraulic control system further comprises a working control valve. And an oil inlet of the working control valve is connected with an oil outlet of the hydraulic pump. And an oil outlet of the working control valve is connected with an oil inlet of the hydraulic motor. The work control valve is used for controlling the communication state of the oil outlet of the hydraulic pump and the oil inlet of the hydraulic motor. The control device is connected with the working control valve and is used for switching the working state of the working control valve.
According to the hydraulic control system provided by the utility model, the working control valve comprises a working position and a working cut-off position.
In the state of the working position, an oil outlet of the hydraulic pump is communicated with an oil inlet of the hydraulic motor; and in the working cut-off position state, the oil outlet of the hydraulic pump is cut off from the oil inlet of the hydraulic motor.
According to the hydraulic control system provided by the utility model, the unloading control valve is an electromagnetic valve, and the working control valve is an electromagnetic proportional valve.
According to the hydraulic control system provided by the utility model, in the operation of starting the hydraulic motor, the control device controls the working control valve to be switched to the working position, and then controls the unloading control valve to be switched to the unloading stop position in a delayed manner.
And in the work of closing the hydraulic motor, the control device controls the unloading control valve to be switched to the unloading position, and then, the working control valve is controlled to be switched to the working cut-off position in a delay mode.
According to the hydraulic control system provided by the utility model, the hydraulic control system further comprises a constant-difference overflow valve. And an oil inlet of the constant-difference overflow valve is connected with an oil inlet of the working control valve. And an oil outlet of the constant-difference overflow valve is connected with the oil tank. The first control oil port of the constant-difference overflow valve is connected with the oil inlet of the constant-difference overflow valve. And a second control oil port of the constant-difference overflow valve is connected with an oil outlet of the working control valve. And a spring is further arranged on one side of the second control oil port of the constant-difference overflow valve.
According to the hydraulic control system provided by the utility model, the hydraulic control system further comprises a safety valve. An oil inlet of the safety valve is connected with an oil outlet of the hydraulic pump, and an oil outlet of the safety valve is connected with the oil tank.
According to the hydraulic control system provided by the utility model, the pressure detection device is a pressure sensor.
According to a second aspect of the present utility model there is provided a work machine comprising a hydraulic control system as described above.
In the hydraulic control system provided by the utility model, an unloading control valve is arranged between an oil outlet of a hydraulic pump and an oil tank. The unloading control valve is used for controlling the communication state of the oil outlet of the hydraulic pump and the oil tank. The oil outlet of the hydraulic pump is connected with the hydraulic motor so that the hydraulic pump supplies oil for the hydraulic motor. The pressure detection device is mounted at the oil inlet of the hydraulic motor and is used for detecting an actual pressure value at the oil inlet of the hydraulic motor. The control device is connected with the unloading control valve and the pressure detection device and is used for controlling the working state of the unloading control valve based on the detection result of the pressure detection device.
Specifically, in the working process, when the pressure detection device detects that the actual pressure value at the oil inlet of the hydraulic motor is in a normal range, the control device controls the working state of the unloading control valve so as to enable the oil outlet of the hydraulic pump and the oil tank to be mutually cut off, and the oil liquid output by the hydraulic pump is supplied to the hydraulic motor to drive the hydraulic motor to normally operate. When the hydraulic motor fails, the pressure detection device detects that the actual pressure value at the oil inlet of the hydraulic motor exceeds a preset limit pressure value, and the control device controls the working state of the unloading control valve, so that the oil outlet of the hydraulic pump is directly communicated with the oil tank, and the oil liquid output by the hydraulic pump directly flows back into the oil tank through the unloading control valve.
Through the structure, an unloading control valve is arranged between the oil outlet of the hydraulic pump and the oil tank. And a pressure detection device is arranged at the oil inlet of the hydraulic motor. The control device controls the operating state of the unloading control valve based on the detection result of the pressure detection device. When the fault pressure of the hydraulic motor exceeds the standard, the oil outlet of the hydraulic pump is directly communicated with the oil tank. Therefore, the safety overflow power loss of the hydraulic control system can be greatly reduced, and the energy-saving performance is good.
Further, since the work machine includes the hydraulic control system as described above, it also has the advantages as described above.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic system diagram of a hydraulic control system provided by the present utility model;
reference numerals:
100. a hydraulic pump; 200. an unloading control valve; 201. unloading position; 202. unloading a cut-off position; 300. a hydraulic motor; 400. a pressure detection device; 500. an oil tank; 600. a work control valve; 601. a working position; 602. a work cut-off position; 700. a constant-difference overflow valve; 800. a safety valve.
Detailed Description
Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the utility model but are not intended to limit the scope of the utility model.
In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present utility model. 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.
In describing embodiments of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present utility model will be understood in detail by those of ordinary skill in the art.
In embodiments of the utility model, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 the embodiments of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed 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, as well as features of various embodiments or examples, described in this specification may be combined and combined to further clarify the objects, aspects and advantages of embodiments of the present utility model, without departing from the spirit and scope of the utility model, and it should be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
A hydraulic control system and a working machine according to an embodiment of the present utility model are described below with reference to fig. 1. It should be understood that the following description is only illustrative of the embodiments of the utility model and is not intended to limit the utility model in any way.
An embodiment of the first aspect of the present utility model provides a hydraulic control system including a hydraulic pump 100, an unloading control valve 200, a hydraulic motor 300, a pressure detecting device 400, a control device, and a tank 500, as shown in fig. 1.
The oil inlet of the hydraulic pump 100 is connected with the oil tank 500, and the oil outlet of the hydraulic pump 100 is connected with the oil tank 500 through the unloading control valve 200. The unloading control valve 200 is used to control the communication state of the oil outlet of the hydraulic pump 100 with the oil tank 500. The oil inlet of the hydraulic motor 300 is connected with the oil outlet of the hydraulic pump 100, and the oil drain port and the oil outlet of the hydraulic motor 300 are respectively connected with the oil tank 500 and the pressure detection device 400 is arranged at the oil inlet of the hydraulic motor 300. The control device is connected to the pressure detection device 400 and the unloading control valve 200. The control means is for controlling the operating state of the unloading control valve 200 based on the detection result of the pressure detection means 400.
In the hydraulic control system provided by the present utility model, the unloading control valve 200 is provided between the oil outlet of the hydraulic pump 100 and the oil tank 500. The unloading control valve 200 is used to control the communication state of the oil outlet of the hydraulic pump 100 with the oil tank 500. An oil outlet of the hydraulic pump 100 is connected with an oil inlet of the hydraulic motor 300, so that the hydraulic pump 100 supplies the hydraulic motor 300 with oil. The pressure detecting device 400 is mounted to the oil inlet of the hydraulic motor 300 and serves to detect an actual pressure value at the oil inlet of the hydraulic motor 300. The control device is connected to the unloading control valve 200 and the pressure detection device 400, and is configured to control the operating state of the unloading control valve 200 based on the detection result of the pressure detection device 400.
Specifically, in operation, when the pressure detecting device 400 detects that the actual pressure value at the oil inlet of the hydraulic motor 300 is within the normal range, the control device controls the operating state of the unloading control valve 200 so that the oil outlet of the hydraulic pump 100 and the oil tank 500 are blocked from each other, and the oil output from the hydraulic pump 100 is supplied to the hydraulic motor 300 to drive the hydraulic motor 300 to operate normally. When the hydraulic motor 300 fails and the pressure detecting device 400 detects that the actual pressure value at the oil inlet of the hydraulic motor 300 exceeds the preset limit pressure value, the control device controls the working state of the unloading control valve 200 so that the oil outlet of the hydraulic pump 100 is directly communicated with the oil tank 500, and the oil output by the hydraulic pump 100 directly flows back into the oil tank 500 through the unloading control valve 200.
With this structural arrangement, the unloading control valve 200 is provided between the oil outlet of the hydraulic pump 100 and the oil tank 500. A pressure detecting device 400 is provided at an oil inlet of the hydraulic motor 300. The control device controls the operating state of the unloading control valve 200 based on the detection result of the pressure detection device 400. When the hydraulic motor 300 fails to have a pressure exceeding the standard, the oil outlet of the hydraulic pump 100 is directly communicated with the oil tank 500. Therefore, compared with the prior art, the hydraulic control system can greatly reduce the safety overflow power loss, and has better energy conservation.
The present utility model is not limited in any way as to the particular type of pressure detection device 400. For example, in one embodiment of the present utility model, the pressure detection device 400 described above includes, but is not limited to, a pressure sensor.
In one embodiment of the present utility model, the unloading control valve 200 includes an unloading bit 201 and an unloading cutoff bit 202.
In the state of the unloading position 201, the oil outlet of the hydraulic pump 100 is communicated with the oil tank 500; in the state of the unloading cutoff position 202, the oil outlet of the hydraulic pump 100 is cut off from the oil tank 500.
For example, the unloading control valve 200 is a two-position two-way reversing valve. During normal operation, when the hydraulic motor 300 is operating normally, the actual pressure value at its oil inlet is within the normal range. The control device controls the unloading control valve 200 to switch to the unloading cutoff position 202. At this time, the oil outlet of the hydraulic pump 100 is blocked from the oil tank 500, and the hydraulic oil output from the hydraulic pump 100 is supplied to the hydraulic motor 300 to drive the hydraulic motor 300 to operate. When the hydraulic motor 300 fails, resulting in an actual pressure value at its oil inlet exceeding the limit pressure value, the control device controls the unloading control valve 200 to switch to the unloading position 201. At this time, the oil outlet of the hydraulic pump 100 is directly communicated with the oil tank 500. The oil output from the hydraulic pump 100 flows back into the oil tank 500.
In one embodiment of the present utility model, the hydraulic control system further includes a work control valve 600. The oil inlet of the operation control valve 600 is connected with the oil outlet of the hydraulic pump 100. An oil outlet of the operation control valve 600 is connected with an oil inlet of the hydraulic motor 300. The operation control valve 600 is used to control the communication state of the oil outlet of the hydraulic pump 100 and the oil inlet of the hydraulic motor 300. The control device is connected to the operation control valve 600. The control device is used to switch the operating state of the operating control valve 600.
Further, in one embodiment of the present utility model, the service control valve 600 includes a service position 601 and a service shut-off position 602.
In the state of the working position 601, the oil outlet of the hydraulic pump 100 is communicated with the oil inlet of the hydraulic motor 300; in the state of the operation cut-off position 602, the oil outlet of the hydraulic pump 100 is cut off from the oil inlet of the hydraulic motor 300.
For example, the operation control valve 600 is a two-position two-way directional valve. One working oil port of the two-position two-way reversing valve is connected with an oil outlet of the hydraulic pump 100, and the other working oil port of the two-position two-way reversing valve is connected with an oil inlet of the hydraulic motor 300. When the hydraulic motor 300 needs to be started normally, the two-position two-way reversing valve is switched to the working position 601, and at this time, the oil outlet of the hydraulic pump 100 and the oil inlet of the hydraulic motor 300 are communicated with each other. When the hydraulic motor 300 needs to be turned off, the two-position two-way reversing valve is switched to the work cut-off position 602, and at this time, the oil outlet of the hydraulic pump 100 and the oil inlet of the hydraulic motor 300 are cut off from each other.
More specifically, in yet another embodiment of the present utility model, the unloading control valve 200 is a solenoid valve. The operation control valve 600 is a solenoid proportional valve.
Further, in one embodiment of the present utility model, after the control device controls the operation control valve 600 to switch to the operation position 601 in starting the operation of the hydraulic motor 300, the time-lapse control unloading control valve 200 is switched to the unloading cutoff position 202; in the operation of turning off the hydraulic motor 300, the control device controls the unloading control valve 200 to switch to the unloading position 201, and thereafter, the delay control operation control valve 600 switches to the operation stop position 602.
For example, as shown in fig. 1, in this embodiment, the unloading control valve 200 is a two-position two-way electromagnetic directional valve, and the operation control valve 600 is a two-position two-way electromagnetic proportional directional valve. The two-position two-way electromagnetic reversing valve is in the unloading position 201 when the power is lost, and the two-position two-way electromagnetic proportional reversing valve is in the working stop position 602 when the power is lost.
When there is no need to start the hydraulic motor 300, both the unloading control valve 200 and the operation control valve 600 are in a power-off state. At this time, the hydraulic oil output from the hydraulic pump 100 flows back to the oil tank 500 through the unloading control valve 200, and the hydraulic pump 100 is in an unloading state. The hydraulic motor 300 is not fed with oil and is in a stopped state. The load of the whole hydraulic control system is minimum, the hydraulic control system has no overflow loss, and the energy consumption is the lowest.
In addition, the operation control valve 600 may have a drain phenomenon, and the leaked oil may also flow back into the oil tank 500 through the unloading control valve 200, so that the hydraulic motor 300 may be prevented from having a drain pressure-holding rotation.
When it is desired to activate the hydraulic motor 300, the control device gives a ramp current signal to the service control valve 600. That is, the current supplied to the operation control valve 600 by the control device continuously increases from 0 to the target current value. The energization current of the operation control valve 600 is always deenergized to maintain the unloading position 201 until the target current value is reached. After the current flowing through the operation control valve 600 reaches the target current value, that is, after the operation control valve 600 is switched to the operation position 601 and reaches the target valve port opening, the control device again controls the unloading control valve 200 to be powered on and is switched to the unloading stop position 202. For example, when the current flowing through the operation control valve 600 reaches the target current value, the control device delays for 100ms and then controls the unloading control valve 200 to switch to the unloading cutoff position 202.
That is, in a state where the operation control valve 600 does not reach the target valve port opening degree, the hydraulic pump 100 is always in the unloading state, and thus, damage to the hydraulic pump 100 due to pressure fluctuation caused by abrupt opening of the valve port of the operation control valve 600 can be reduced, and the service life of the hydraulic pump 100 can be further prolonged. When the valve port opening of the operation control valve 600 reaches the target state, the hydraulic pump 100 normally drives the hydraulic motor 300 to operate. In this process, by adjusting the magnitude of the current signal of the operation control valve 600, stepless speed regulation of the hydraulic motor 300 can be achieved.
When the hydraulic motor 300 needs to be switched from the on state to the off state, the control device first switches the unloading control valve 200 to the unloading state, and then delays 100ms to control the operation control valve 600 to switch to the operation stop position 602. In this process, the oil outputted from the hydraulic pump 100 is directly returned to the oil tank 500 through the unloading control valve 200, and then the oil outlet of the hydraulic pump 100 is disconnected from the oil inlet of the hydraulic motor 300. During the return of the hydraulic pump 100 into the tank 500, the hydraulic motor 300 continues to rotate due to inertia for a period of time, during which the hydraulic motor 300 is able to draw a portion of the oil from the hydraulic pump 100 or the tank 500. This can reduce the abnormal noise phenomenon of the hydraulic motor 300 due to the rapid stop. In addition, the oil in the oil path between the working control valve 600 and the hydraulic pump 100 can flow back to the oil tank 500 through the unloading control valve 200, so that the oil leaked between the working control valve 600 and the oil inlet of the hydraulic motor 300 can be reduced, the phenomenon of autorotation of the hydraulic motor 300 is effectively avoided, and the experience of customers is improved.
In yet another embodiment of the present utility model, the hydraulic control system further includes a relief valve 800. An oil inlet of the relief valve 800 is connected with an oil outlet of the hydraulic pump 100, and an oil outlet of the relief valve 800 is connected with the oil tank 500.
For example, as shown in fig. 1, in this embodiment, the relief valve 800 is a relief valve. An oil inlet of the relief valve 800 is connected with an oil outlet of the hydraulic pump 100, and an oil outlet of the relief valve 800 is connected with the oil tank 500. When the system pressure reaches the set pressure value of the relief valve 800, the relief valve 800 is opened and the hydraulic pump 100 is unloaded through the relief valve 800. For example, the relief valve 800 may serve as a safety protection device for the hydraulic pump 100 when the unloading control valve 200 or the pressure detection device 400 fails.
In yet another embodiment of the present utility model, the hydraulic control system further includes a differential relief valve 700. An oil inlet of the constant difference overflow valve 700 is connected with an oil inlet of the working control valve 600. The oil outlet of the constant difference overflow valve 700 is connected with the oil tank 500. The first control oil port of the constant-difference overflow valve 700 is connected with the oil inlet of the constant-difference overflow valve 700. The second control oil port of the constant difference overflow valve 700 is connected with the oil outlet of the working control valve 600. A spring is further provided at the second control port side of the constant difference overflow valve 700.
The constant-difference relief valve 700 has a certain pressure compensation function, and can maintain constant flow rate input into the hydraulic motor 300 through the hydraulic pump 100, thereby reducing influence of pressure variation on operation stability of the hydraulic motor 300, and further, enabling a working device connected with the hydraulic motor 300 to operate stably.
Embodiments of the second aspect of the present utility model provide a work machine comprising a hydraulic control system as described above.
For example, in one embodiment of the present disclosure, the work machine is a paver.
It should be understood herein that the above-described embodiment is only one exemplary embodiment of the present utility model and should not be construed as limiting the present utility model in any way. That is, specific types of work machines described above include, but are not limited to, pavers. For example, in other embodiments of the present disclosure, the work machine may be a grader, a roller, a milling machine, or the like.
Further, since the work machine includes the hydraulic control system as described above, it also has the advantages as described above.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. A hydraulic control system is characterized by comprising a hydraulic pump, an unloading control valve, a hydraulic motor, a pressure detection device, a control device and an oil tank,
the hydraulic pump comprises an oil tank, an oil outlet of the hydraulic pump, an unloading control valve, a pressure detection device and a control device, wherein the oil outlet of the hydraulic pump is connected with the oil tank through the unloading control valve, the unloading control valve is used for controlling the communication state of the oil outlet of the hydraulic pump and the oil tank, an oil inlet of the hydraulic motor is connected with the oil outlet of the hydraulic pump, the pressure detection device is arranged at the oil inlet of the hydraulic motor, the control device is connected with the pressure detection device and the unloading control valve, and the control device is used for controlling the working state of the unloading control valve based on the detection result of the pressure detection device.
2. The hydraulic control system of claim 1, wherein the unloading control valve includes an unloading position and an unloading cutoff position,
in the unloading position state, an oil outlet of the hydraulic pump is communicated with the oil tank; and in the unloading stop position state, the oil outlet of the hydraulic pump is stopped with the oil tank.
3. The hydraulic control system according to claim 2, further comprising a work control valve, an oil inlet of the work control valve being connected to an oil outlet of the hydraulic pump, an oil outlet of the work control valve being connected to an oil inlet of the hydraulic motor, the work control valve being for controlling a communication state of the oil outlet of the hydraulic pump and the oil inlet of the hydraulic motor, the control device being connected to the work control valve, the control device being for switching an operation state of the work control valve.
4. The hydraulic control system of claim 3, wherein the service control valve includes a service position and a service shut-off position,
in the state of the working position, an oil outlet of the hydraulic pump is communicated with an oil inlet of the hydraulic motor; and in the working cut-off position state, the oil outlet of the hydraulic pump is cut off from the oil inlet of the hydraulic motor.
5. The hydraulic control system of claim 4, wherein the unloading control valve is a solenoid valve and the working control valve is a solenoid proportional valve.
6. The hydraulic control system according to claim 4, wherein in starting the operation of the hydraulic motor, the control device controls the operation control valve to switch to the operation position, and then controls the unloading control valve to switch to the unloading cutoff position with a delay; and in the work of closing the hydraulic motor, the control device controls the unloading control valve to be switched to the unloading position, and then, the working control valve is controlled to be switched to the working cut-off position in a delay mode.
7. The hydraulic control system of claim 4, further comprising a fixed differential relief valve, wherein an oil inlet of the fixed differential relief valve is connected with an oil inlet of the working control valve, an oil outlet of the fixed differential relief valve is connected with the oil tank, a first control oil port of the fixed differential relief valve is connected with an oil inlet of the fixed differential relief valve, a second control oil port of the fixed differential relief valve is connected with an oil outlet of the working control valve, and a spring is further arranged on one side of the second control oil port of the fixed differential relief valve.
8. The hydraulic control system according to any one of claims 1 to 7, further comprising a relief valve, an oil inlet of the relief valve being connected to an oil outlet of the hydraulic pump, an oil outlet of the relief valve being connected to the oil tank.
9. The hydraulic control system according to any one of claims 1 to 7, characterized in that the pressure detection means is a pressure sensor.
10. A work machine comprising a hydraulic control system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320486669.0U CN219413075U (en) | 2023-03-13 | 2023-03-13 | Hydraulic control system and working machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320486669.0U CN219413075U (en) | 2023-03-13 | 2023-03-13 | Hydraulic control system and working machine |
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| Publication Number | Publication Date |
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| CN219413075U true CN219413075U (en) | 2023-07-25 |
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| CN202320486669.0U Active CN219413075U (en) | 2023-03-13 | 2023-03-13 | Hydraulic control system and working machine |
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| CN (1) | CN219413075U (en) |
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- 2023-03-13 CN CN202320486669.0U patent/CN219413075U/en active Active
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