CN112555207A

CN112555207A - Hydraulic control system and mechanical equipment

Info

Publication number: CN112555207A
Application number: CN202011387538.4A
Authority: CN
Inventors: 唐文杰; 罗建华; 肖广飞
Original assignee: Shanghai Huaxing Digital Technology Co Ltd
Current assignee: Shanghai Huaxing Digital Technology Co Ltd
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2021-03-26
Also published as: WO2022116567A1

Abstract

The application provides a hydraulic control system and mechanical equipment, and the hydraulic control system comprises a pump, a first device, a second device and a backflow control device. The pump includes an output channel to output the fluid. A first device is connected to the output passage to perform a work operation under the drive of fluid output from the pump. A second device is connected to the output channel to perform a work operation under the supply of fluid output by the pump. A backflow control device is connected between the output channel and the first device. When the first device performs the first working operation, the first device discharges the fluid, and the backflow control device is opened to guide the fluid discharged from the first device to the output passage and supply the fluid to the second device. The hydraulic control system can reduce the work burden of the pump, namely, reduce the power consumption of the pump, and can also avoid the temperature rise of fluid of the whole hydraulic control system and avoid the poor work of equipment of the hydraulic control system.

Description

Hydraulic control system and mechanical equipment

Technical Field

The application relates to the technical field of engineering machinery, in particular to a hydraulic control system and mechanical equipment.

Background

A hydraulic control system is widely used in a machine (e.g., an excavator) at present, and fluid (e.g., hydraulic oil, etc.) in the hydraulic control system overflows when the machine performs a specific operation (e.g., swing braking, etc.), and the overflowing fluid has high-pressure energy.

With current hydraulic control systems, the overflow fluid may be returned to a fluid storage device (e.g., a tank) to make inefficient use of the high pressure energy, and further, during the flow back to the storage device, the overflow fluid may generate a large amount of heat due to the release of pressure, which causes the fluid of the hydraulic control system to increase in temperature, resulting in inefficient operation of the mechanical equipment.

Disclosure of Invention

In view of the above, the present application provides a hydraulic control system and a mechanical device, which can solve the above technical problems.

A first aspect of the present application provides a hydraulic control system including a pump, a first device, a second device, and a return flow control device. The pump includes an output channel to output the fluid. A first device is connected to the output passage to perform a work operation under the drive of fluid output from the pump. A second device is connected to the output channel to perform a work operation under the supply of fluid output by the pump. A backflow control device is connected between the output channel and the first device. When the first device performs the first working operation, the first device discharges the fluid, and the backflow control device is opened to guide the fluid discharged from the first device to the output passage and supply the fluid to the second device.

In this aspect, the fluid discharged by the first device when performing the first working operation is delivered to the output channel of the pump to be applied to the second device, thereby reducing the amount of fluid supplied by the pump alone to the second device, thereby reducing the working burden of the pump, i.e., reducing the power consumption of the pump; in addition, the output channel of the pump has high pressure, and in the process, the discharged fluid does not need to be depressurized or is limited in depressurization, namely, the fluid discharged by the first device does not release heat or releases less heat when entering the output channel, so that the temperature rise of the fluid of the whole hydraulic control system is avoided, and the equipment of the hydraulic control system is prevented from operating badly.

In one possible implementation of the first aspect of the present application, the hydraulic control system may further include a control device in signal connection with the return flow control device and the first device. When the control device detects that the first device is executing the first work operation, the control device controls the backflow control device to be started. When the control device detects that the first device is not executing the first work operation, the control device controls the backflow control device to be closed.

In this arrangement, the discharged fluid is directed to the output passage of the pump only when the first device is performing the first working operation, and the return flow control device is in the closed state without affecting the working operation of the first device with the fluid when the first device is performing the other working operation.

In one possible implementation of the first aspect of the present application, the first device includes a first chamber, a second chamber, and an actuator. The first chamber is communicated with the backflow control device; the second chamber is communicated with the output channel; the execution mechanism is configured to execute a first work operation. The first chamber and the second chamber drive the actuator to move through the pressure difference, and when the actuator performs the first working operation, the pressure of the first chamber is changed from being lower than the pressure of the second chamber to being higher than the pressure of the second chamber.

In this scheme, the discharged fluid with high pressure energy is returned to the output channel of the pump by a return flow control device to achieve energy recovery.

In one possible implementation manner of the first aspect of the present application, the control device includes a controller, and a first pressure sensor and/or a second pressure sensor, and the first pressure sensor and/or the second pressure sensor are in signal connection with the controller. The controller is in signal connection with the backflow control device. A first pressure sensor is located in the first chamber. A second pressure sensor is located in the second chamber. The controller is configured to detect a pressure state of the first chamber and/or the second chamber according to the first pressure sensor and/or the second pressure sensor to determine whether the first device is performing the first work operation stage.

In the scheme, the first pressure sensor and the second pressure sensor are used for judging the working operation state of the first device, so that the time when the backflow control device needs to be opened and closed can be judged.

In one possible implementation of the first aspect of the present application, the hydraulic control system may further include a reserve tank and a first relief valve. The reservoir supplies fluid to the pump. The first relief valve is located on the first chamber and is configured to enable fluid in the first chamber to escape to the storage tank through the first relief valve when the first device performs the first work operation. The first device maintains the lower limit pressure of the first chamber to be a first preset pressure during the first operation, the controller controls the lower limit pressure of the first chamber to be a second preset pressure when the backflow control device is opened, the preset opening pressure of the first overflow valve is larger than the second preset pressure, and the second preset pressure is larger than the first preset pressure.

In this arrangement, the first relief valve may act as a protection mechanism if the return flow control device is closed or if the flow of fluid directed from the return flow control device is limited.

In one possible implementation manner of the first aspect of the present application, the hydraulic control system may further include a third pressure sensor in signal connection with the controller and configured to detect a pressure of the output passage. The controller is configured to adjust the opening degree of the backflow control device when the backflow control device is opened according to the pressure of the output channel and the pressure of the first chamber; and/or a controller is in signal connection with the pump, and the controller is configured to adjust the output power of the pump according to the pressure of the output channel and the pressure of the first chamber.

In the scheme, when the first device executes the first operation, the pressure of the output channel can be in a safe range or a preset range by regulating and controlling the opening degree of the backflow control device; furthermore, the need for the pump to output fluid is reduced, so that the output power of the pump can be reduced to reduce power consumption.

In a possible implementation manner of the first aspect of the present application, the backflow control device includes a valve and a first pipe, one end of the first pipe is connected to the first device, the other end of the first pipe is connected to the output channel, the valve is configured to control conduction of the first pipe, and the control device controls an opening degree of the valve.

In this solution, it can be selected whether the reflow control device needs to be activated according to the actual process requirements.

In a possible implementation manner of the first aspect of the present application, the backflow control device includes a second overflow valve and a second pipe, one end of the second pipe is connected to the second overflow valve, the other end of the second pipe is connected to the output channel, the second overflow valve is connected to the first device, the first device maintains a lower limit pressure of an overflow generated during the first operation as a first preset pressure, and a preset opening pressure of the second overflow valve is greater than the first preset pressure.

In the scheme, when the first device executes the first operation, a controller and the like are not needed for regulation and control, the structural design of the hydraulic control system can be simplified, the operation mode of the hydraulic control system is simplified, and the cost is reduced.

In one possible implementation of the first aspect of the present application, the hydraulic control system may further include a reserve tank and a first relief valve. The reservoir supplies fluid to the pump. The first overflow valve is used for enabling the fluid in the first chamber to overflow to the storage tank through the first overflow valve when the first device executes the first working operation. And under the condition that the reflux control device comprises a second overflow valve, the preset opening pressure of the first overflow valve is greater than the preset opening pressure of the second overflow valve.

In this aspect, when the first working operation is performed, if the flow rate of the fluid led out by the second relief valve is limited, the first relief valve may function as a protection mechanism.

In one possible implementation of the first aspect of the present application, the first device includes one or a combination of some of a swing motor, an arm cylinder, a bucket cylinder, and a boom cylinder, and the second device includes another or a combination of some of the swing motor, the arm cylinder, the bucket cylinder, and the boom cylinder.

A second aspect of the present application provides a machine including a hydraulic control system as described in the first aspect.

A third aspect of the present application provides a hydraulic control method including: detecting whether a first device of a hydraulic control system executes a first working operation, wherein the first device is connected with an output channel of a pump of the hydraulic control system to execute the working operation under the drive of fluid output by the pump, and a backflow control device is arranged between the first device and the output channel of the pump; when it is detected that the first device performs the first working operation, the backflow control device is controlled to be opened to direct the fluid discharged from the first device to the output passage of the pump and to be supplied to the second device.

In the detection method of this aspect, the fluid discharged by the first device when performing the first working operation is delivered to the output channel of the pump to be applied to the second device, thereby reducing the amount of fluid supplied by the pump alone to the second device, thereby reducing the working burden of the pump, i.e., reducing the power consumption of the pump; in addition, the output channel of the pump has high pressure, and in the process, the discharged fluid does not need to be depressurized or is limited in depressurization, namely, the fluid discharged by the first device does not release heat or releases less heat when entering the output channel, the temperature rise of the fluid of the whole hydraulic control system is avoided, and the equipment of the hydraulic control system is prevented from having poor operation

Drawings

Fig. 1 is a schematic structural diagram of a hydraulic control system according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of another hydraulic control system provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of another hydraulic control system according to an embodiment of the present application;

fig. 4 is a schematic diagram of a control method of a hydraulic control system according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.

Mechanical devices having hydraulic control systems require the discharge of fluid having high pressure energy when performing certain operations. Taking a hydraulic excavator as an example, a swing device of the hydraulic excavator needs to perform a swing operation so as to have a swing kinetic energy. When the swing action is stopped, a swing valve core (such as a swing reversing valve in the following embodiment) in the hydraulic excavator is closed, most of hydraulic oil for driving the swing device to rotate overflows through an overflow valve in the swing motor and returns to the oil tank, the overflowed hydraulic oil has high-pressure energy caused by the swing energy, and if the hydraulic oil with the high-pressure energy directly returns to the oil tank for reuse, the high-pressure energy is wasted, namely, the throttling loss of a valve port is caused; in addition, the temperature of the fluid of the hydraulic control system is increased due to heat generated by pressure release in the process that the hot hydraulic oil with high-pressure energy flows back to the oil tank, and the viscosity of the hot hydraulic oil is sharply reduced after the temperature of the hot hydraulic oil is increased, so that the operation efficiency of the slewing device is reduced, even the slewing device cannot realize effective braking when the slewing operation needs to be stopped, and the risk of operation failure exists.

In view of the above, at least one embodiment of the present application provides a hydraulic control system, which can solve the above technical problems. The hydraulic control system includes a pump, a first device, a second device, and a return flow control device. The pump includes an output channel to output the fluid. A first device is connected to the output passage to perform a work operation under the drive of fluid output from the pump. A second device is connected to the output channel to perform a work operation under the supply of fluid output by the pump. A backflow control device is connected between the output channel and the first device. When the first device performs the first working operation, the first device discharges the fluid, and the backflow control device is opened to guide the fluid discharged from the first device to the output passage and supply the fluid to the second device. In this way, the fluid discharged by the first device when performing the first working operation is delivered to the output channel of the pump to be applied to the second device, thereby reducing the amount of fluid supplied by the pump alone to the second device, thereby reducing the working burden of the pump, i.e., reducing the power consumption of the pump; in addition, the output channel of the pump has high pressure, and in the process, the discharged fluid does not need to be depressurized or is limited in depressurization, namely, the fluid discharged by the first device does not release heat or releases less heat when entering the output channel, so that the temperature rise of the fluid of the whole hydraulic control system is avoided, and the equipment of the hydraulic control system is prevented from operating badly.

Hereinafter, the structure of a hydraulic control system according to at least one embodiment of the present application will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, a hydraulic control system provided in at least one embodiment of the present application includes a first device 100, a second device 200, a pump 300, and a backflow control device 400. The pump 300 includes an output channel 310 to output fluid, for example, the pump 300 draws fluid from the reservoir 600 for output. The first device 100 is connected to the output channel 310 to perform a work operation driven by the fluid output from the pump 100. The second device 200 is connected to the output passage 310 to perform a working operation under the supply of the fluid output from the pump 100. The backflow control device 400 is connected between the output channel 310 and the first device 100. When the first device 100 performs the first working operation, the first device 100 discharges the fluid, and the backflow control device 400 is turned on to guide the fluid discharged from the first device 100 to the output passage 310 and supply the fluid to the second device 200.

For example, some embodiments of the present application provide that the hydraulic control system may further include a control device in signal connection with the return flow control device and the first device. When the first device is detected to be in the first working operation, the control device controls the backflow control device to be started. The control device controls the backflow control device to be turned off when the first device is detected to be in a stage where the first work operation is not performed. In this way, the control device is used for detecting whether the first device is in the stage of executing the first operation or not so as to control the working state of the backflow control device according to the detection result, so that the backflow control device can only guide the discharged fluid to the output channel of the pump when the first device executes the first operation, and when the first device executes other operation, the backflow control device is in the closed state and cannot influence the operation of the first device by the fluid.

Illustratively, as shown in fig. 1, the hydraulic control system includes a control device 500, and the control device 500 is in signal connection with the first device 100 to detect whether the first device 100 performs the first work operation, and accordingly controls the opening and closing of the backflow control device 400. The control device 500 detects the operation state of the first device 100, so that the fluid can be guided out by controlling the opening and closing of the backflow control device 400 under the condition that the first device 100 can perform the first operation, that is, the operation of the first device 100 is not affected while the energy of the fluid is recycled.

It should be noted that, in the embodiment of the present application, the types of the first device and the second device are not limited as long as the first device can be driven by fluid to perform a working operation and needs to discharge high-pressure fluid when performing a specific working operation, and the second device needs to perform a working operation under supply of fluid.

For example, in the embodiment of the present application, the hydraulic control system is applied to a hydraulic excavator, and the first device and the second device may be selected as one or a combination of a swing motor, an arm cylinder, a bucket cylinder, and a boom cylinder. For example, further, the first device and the second device may be different types of devices.

For example, in some embodiments of the present application, the first device includes one or a combination of a swing motor, an arm cylinder, a bucket cylinder, and a boom cylinder, and the second device includes another or a combination of a swing motor, an arm cylinder, a bucket cylinder, and a boom cylinder.

It should be noted that, in the embodiment of the present disclosure, the working operation of the first device may include actions of rotating, sliding, extending, swinging, or lifting (or lifting), or other types of actions according to different types of the first device.

The operation principle of the configuration of the hydraulic control system according to at least one embodiment of the present application will be described in detail below, taking an example in which the first device is a swing motor and the second device is an arm cylinder, in which the working operation of the first device is a swing and the first working operation is a braking in a swing course.

For example, in some embodiments of the present application, a hydraulic control system is provided in which a first device includes a first chamber, a second chamber, and an actuator. The first chamber is communicated with the backflow control device; the second chamber is communicated with the output channel; the execution mechanism is configured to execute a first work operation. The first chamber and the second chamber drive the actuator to move through the pressure difference, and when the actuator performs the first working operation, the pressure of the first chamber is changed from being lower than the pressure of the second chamber to being higher than the pressure of the second chamber. The first device is a rotary motor. In this manner, a pressure differential is created between the first and second chambers by controlling the flow of fluid in the first and second chambers. In the case where the pressure of the first chamber is lower than the pressure of the second chamber, the actuator moves (rotates) from the second chamber to the first chamber under the pushing action of the pressure difference, and when the first working operation (for example, swing braking) is performed, the actuator continues to rotate and compress the space of the first chamber under the inertia effect, so that the pressure of the first chamber is increased and the pressure of the second chamber is reduced, and when the pressure of the first chamber is too high, the fluid needs to be discharged. In this case, the discharged fluid having high-pressure energy is returned to the output passage of the pump by the return flow control means to achieve energy recovery.

Illustratively, as shown in FIG. 1, the rotary motor 100 includes a chamber A, a chamber B, and an actuator (not shown). Chamber A and Chamber B are connected to the output channel 310 of the pump 300. For example, the actuator may be connected to or integrally formed with chamber a and chamber B such that, in the event of a pressure differential between chamber a and chamber B, the actuator may move (rotate) under the action of the pressure differential.

It should be noted that, in the embodiment of the present application, the first chamber is one of the chamber a and the chamber B, and the second chamber is the other of the chamber a and the chamber B. For example, during one revolution, the actuator is diverted from chamber a to chamber B and then braked, during which brake the first chamber is chamber B and the second chamber is chamber a. Conversely, in another revolution, the actuator is diverted from chamber B to chamber a and then braked, during which the first chamber is chamber a and the second chamber is chamber B.

For example, in at least one embodiment of the present application, as shown in FIG. 1, the hydraulic control system may include a rotary reversing valve 110, the rotary reversing valve 110 being in communication with Chamber A, Chamber B, and an output passage 310 of the pump 300. The directional switching by the rotary reversing valve 110 causes chamber B to act as a fluid inlet and chamber a to act as a fluid outlet, or causes chamber a to act as a fluid inlet and chamber B to act as a fluid outlet. In this manner, by controlling the flow rate differential between the fluid inlet and the fluid outlet, a pressure differential can be created between chamber a and chamber B.

Next, the operation principle of the first device in the hydraulic control system according to at least one embodiment of the present application will be described in detail, taking one swing process of the swing motor as an example. During this rotation, chamber a acts as a first chamber and chamber B acts as a second chamber.

As shown in fig. 1, fluid is input to chamber B (the second chamber) through an output passage 310 of the pump 300 to increase the fluid pressure in chamber B so that the fluid pressure in chamber B is much greater than the fluid pressure in chamber a (the first chamber), and the pressure differential between chamber a and chamber B causes the actuator to rotate from chamber B to chamber a. During swing braking, fluid delivery to chamber a and chamber B is stopped (e.g., swing selector valve 110 is closed), and due to the inertial motion of the actuator, the actuator continues to rotate toward chamber a, thereby increasing the pressure in chamber a and decreasing the pressure in chamber B, and during swing braking (actuator stopped motion), the fluid pressure in chamber a transitions to a pressure that is substantially greater than the fluid pressure in chamber B. During swing braking, chamber a is over pressurized and requires fluid to be exhausted.

For example, in at least one embodiment of the present application, the actuator in the swing motor may be a swing platform. For example, an operator station may be provided on the platform. For example, a control device (controller) or the like may be provided in the operator station. For example, input devices including a steering wheel, a handlebar, a push-pull device, a switch, a pedal, etc. may also be provided in the operator station for sending commands to the control device.

For example, in some embodiments of the present application, a hydraulic control system is provided in which the control device includes a controller, a first pressure sensor and/or a second pressure sensor, the first pressure sensor and/or the second pressure sensor being in signal communication with the controller. The controller is in signal connection with the backflow control device. A first pressure sensor is located in the first chamber. A second pressure sensor is located in the second chamber. The controller is configured to detect a pressure state of the first chamber and/or the second chamber according to the first pressure sensor and/or the second pressure sensor to determine whether the first device is performing the first work operation stage. In the embodiments, the pressure of the first chamber and the pressure of the second chamber can be detected by the first pressure sensor and the second pressure sensor, so as to determine the operation state of the first device, and accordingly, the time when the backflow control device needs to be opened and closed can be determined.

Illustratively, as shown in fig. 1, the control device 500 includes a controller 510, a first pressure sensor 521, and a second pressure sensor 522. The first pressure sensor 521 and the second pressure sensor 522 are in signal connection with the controller 510. A first pressure sensor 521 is located in the first chamber (chamber a in fig. 1) and a second pressure sensor 522 is located in the second chamber (chamber B in fig. 1). It should be noted that, in the embodiment of the present application, the first pressure sensor 521 and the second pressure sensor 522 have the same function and the same type, and thus, the identities of the first pressure sensor 521 and the second pressure sensor 522 may be interchanged, that is, when the rotation process shown in fig. 1 is performed, the identifier 521 and the identifier 522 represent the first pressure sensor and the second pressure sensor, respectively; if chamber a is the second chamber and chamber B is the first chamber when performing a swing course opposite to the swing course as shown in fig. 1, then the

marks

521 and 522 represent the second pressure sensor and the first pressure sensor, respectively.

For example, in some embodiments of the present application, as shown in fig. 1, the control device 500 includes a first pressure sensor 521 and a second pressure sensor 522 to detect pressures in the chamber a and the chamber B (a first chamber and a second chamber), respectively, to improve detection accuracy, so as to accurately judge an operation state of the first device (e.g., whether it is in a stage of performing a first operation).

For example, in other embodiments of the present application, as shown in fig. 1, the pressure variation in the chamber a and the chamber B is synchronized, and the pressure variation in one of the chamber a and the chamber B can be known according to the pressure variation in the other of the chamber a and the chamber B, so that in these embodiments, only the first pressure sensor or only the second pressure sensor may be provided in the control device, thereby simplifying the structure of the control device and reducing the cost.

In embodiments of the present application, the controller may comprise a Central Processing Unit (CPU), which may be a single or multi-core processor or a plurality of processors for parallel processing. The controller also includes memory (e.g., random access memory, read only memory, flash memory), a communication interface (e.g., a network adapter) for communicating with one or more other processing devices, and peripheral devices such as timers and the like. The memory, interface and peripheral devices are configured to be electrically connected to the central processing unit through a communication bus (solid lines) such as a motherboard. For example, the controller may include one or more of an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a computer system, and a logic circuit capable of allowing the controller to operate according to the present application.

For example, some embodiments of the present application provide that the hydraulic control system may further include a reserve tank and a first spill valve. The reservoir supplies fluid to the pump. The first relief valve is located on the first chamber and is configured to enable fluid in the first chamber to escape to the storage tank through the first relief valve when the first device performs the first work operation. The first device maintains the lower limit pressure of the first chamber to be a first preset pressure during the first operation, the controller controls the lower limit pressure of the first chamber to be a second preset pressure when the backflow control device is opened, the preset opening pressure of the first overflow valve is larger than the second preset pressure, and the second preset pressure is larger than the first preset pressure. Therefore, the first overflow valve can play a role of a protection mechanism, that is, when the first operation is executed, if the backflow control device is closed or the flow of the fluid led out by the backflow control device is limited, the pressure of the first chamber is still too high, and the fluid of the first chamber can automatically overflow through the first overflow valve, so that the pressure of the first chamber is prevented from exceeding the range of safe pressure (for example, the preset opening pressure of the first overflow valve), and the first device is protected.

For example, as shown in fig. 1, in the actuating structure of the first device 100, during the braking (first working operation) stage when the swing is stopped, the fluid in the chamber a overflows through the first overflow valve and then returns to the storage tank 600. For example, the fluid may be hydraulic oil and the storage tank 600 may be a tank. It should be noted that, the first overflow valve may be disposed in both the chamber a and the chamber B, and when one of the chamber a or the chamber B serves as the first chamber and the pressure of the first chamber reaches the preset opening pressure of the first overflow valve, the first overflow valve in the chamber a or the chamber B serving as the first chamber is opened.

For example, some embodiments of the present application provide that the hydraulic control system may further include a third pressure sensor in signal communication with the controller and configured to detect a pressure of the output passage. The controller is configured to adjust the opening degree of the backflow control device when the backflow control device is opened according to the pressure of the output channel and the pressure of the first chamber; and/or a controller is in signal connection with the pump, and the controller is configured to adjust the output power of the pump according to the pressure of the output channel and the pressure of the first chamber. In this way, after the fluid discharged by the first device when the first operation is performed is guided to the output channel of the pump through the backflow control device, the part of the fluid affects the pressure of the output channel, the pressure of the output channel can be detected through the third pressure sensor, and the pressure of the output channel can be within a safe range or a preset range through regulating and controlling the opening degree of the backflow control device; furthermore, after the portion of the fluid is led to the output channel, the need for the pump to output the amount of fluid is actually reduced while maintaining the pressure in the output channel unchanged (or less variable), so that the output power of the pump can be reduced to reduce power consumption.

For example, as shown in fig. 2, it is set that the second device 200 needs to supply the fluid having a first flow rate (or a first pressure according to the pressure), and when the backflow control device 400 is turned on, assuming that the fluid introduced from the first device 100 to the output passage 310 of the pump 300 via the backflow control device 400 has a second flow rate, the pump 300 draws from the storage tank 600 to supply the fluid of the second device 200 at a flow rate of the first flow rate minus the second flow rate. In this way, the output power (non-maximum output power) of the pump 300 is allowed to be reduced while the flow rate (or fluid pressure) of the fluid supplied to the second device 200 is maintained constant, thereby reducing the power consumption of the pump 300. In the above process, the controller 510 may monitor the pressure of the output channel 310 of the pump 300 in real time by using the third pressure sensor 700, so as to perform comprehensive control on the output power of the pump 300 and the opening degree of the backflow control device 400 (which is equivalent to control the flow rate of the fluid guided from the first device 100 to the output channel 310). For example, in the case of maintaining the pressure of the first chamber to be greater than the first preset pressure, the opening degree of the backflow control device 400 may be increased to further reduce the output power of the pump 300.

For example, in a hydraulic control system provided in some embodiments of the present application, the backflow control device includes a valve and a first pipe, one end of the first pipe is connected to the first device, and the other end of the first pipe is connected to the output passage, the valve is configured to control conduction of the first pipe, and the control device controls an opening degree of the valve. In this way, the on-off of the valve included in the reflow apparatus is controlled by the control apparatus (controller), and during the actual process, whether the reflow control apparatus needs to be activated or not can be selected according to the actual process requirements, for example, the selected intervention factor may be manual intervention.

Illustratively, as shown in FIG. 2, the backflow control device 400 includes a valve and a first conduit 430. The valve includes a control valve 410 and an on-off valve 420. The switching valve 420 is disposed on the first pipe 430 to control whether the first pipe 430 is conducted, and the control valve 410 is in signal connection with the controller 510 and controls the opening degree of the switching valve 420. For example, the switching valve 420 may be a sequence valve, a pilot operated check valve, or the like.

For example, in the hydraulic control system according to another embodiment of the present application, the backflow control device includes a second relief valve and a second pipe, one end of the second pipe is connected to the second relief valve, the other end of the second pipe is connected to the output passage, the second relief valve is connected to the first device, the first device maintains a lower limit pressure of a relief generated at the first working operation to be a first preset pressure, and a preset opening pressure of the second relief valve is greater than the first preset pressure. In this way, when the first device performs the first working operation, as long as the pressure of the fluid to be discharged reaches the preset opening pressure of the second overflow valve, the fluid can be automatically discharged to the output channel of the pump through the second overflow valve, and when the pressure of the fluid to be discharged is lower than the preset opening pressure of the second overflow valve, the second overflow valve automatically closes so that the pressure of the fluid in the first device (for example, the pressure of the fluid in the first chamber) still satisfies the pressure higher than the first preset pressure, so that the first device can still maintain the first working operation. In the process, the structure design of the hydraulic control system can be simplified without regulation and control by a controller and the like, the operation mode of the hydraulic control system is simplified, and the cost is reduced.

Illustratively, as shown in FIG. 3, the backflow control device includes a second relief valve (not shown) and a second conduit 440. A second relief valve may be located at an end of the second conduit 440. For example, a second relief valve is provided in each of the chamber a and the chamber B. The second pipeline 440 may be arranged in a manner that refers to the related description of the first pipeline 430 in the embodiment shown in fig. 1 and fig. 2, which is not described herein again.

For example, in the case where the backflow control device in the hydraulic control system provided by some embodiments of the present application includes the second relief valve, the hydraulic control system may further include a reserve tank and the first relief valve. The reservoir supplies fluid to the pump. The first relief valve is configured to allow fluid in the first chamber to escape to the storage tank through the first relief valve when the first device performs the first work operation. The preset opening pressure of the first overflow valve is greater than the preset opening pressure of the second overflow valve. In this way, the first overflow valve may function as a protection mechanism, that is, when the first operation is performed, if the flow rate of the fluid guided by the second overflow valve is limited, the pressure of the fluid to be guided out of the first device (for example, the fluid in the first chamber) is still too high, and a part of the fluid may also automatically overflow through the first overflow valve, so as to prevent the pressure of the fluid to be guided out of the first device from exceeding a safe pressure (for example, a preset opening pressure of the first overflow valve), thereby protecting the first device.

For example, in one embodiment of the present application, as shown in fig. 1 to 3, in the case where the first device 100 is a swing motor, the second device 200 may be an arm cylinder. The arm cylinder is connected to an output channel 310 of the pump 300 via the stick-shaking direction changing valve 210, and the fluid guided from the first device 100 by the swing control device 400 enters the output channel 310 and then enters the arm cylinder via the arm direction changing valve 210.

At least one embodiment of the present application provides a mechanical apparatus including the hydraulic control system in the foregoing embodiment. The mechanical device may be a hydraulic excavator, a face shovel, a backhoe, a dragline excavator, or the like.

At least one embodiment of the present application provides a hydraulic control method including: detecting whether a first device of a hydraulic control system executes a first working operation, wherein the first device is connected with an output channel of a pump of the hydraulic control system to execute the working operation under the drive of fluid output by the pump, and a backflow control device is arranged between the first device and the output channel of the pump; when it is detected that the first device performs the first working operation, the backflow control device is controlled to be opened to direct the fluid discharged from the first device to the output passage of the pump and to be supplied to the second device. In the detection method, fluid discharged by the first device when performing the first working operation is delivered to the output channel of the pump to be applied to the second device, thereby reducing the amount of fluid supplied by the pump alone to the second device, thereby reducing the working burden of the pump, i.e., reducing the power consumption of the pump; in addition, the output channel of the pump has high pressure, and in the process, the discharged fluid does not need to be depressurized or is limited in depressurization, namely, the fluid discharged by the first device does not release heat or releases less heat when entering the output channel, so that the temperature rise of the fluid of the whole hydraulic control system is avoided, and the equipment of the hydraulic control system is prevented from operating badly.

For example, as shown in fig. 4, the process from the beginning to the end of execution of a hydraulic control method of the hydraulic control system may include the following steps.

First, it is determined whether or not the reflux control device needs to be used during work as needed, and if it is determined to be used, the energy recovery function of the hydraulic control system is turned on, and accordingly, if the reflux control device does not need to be used during work, the energy recovery function of the hydraulic control system may be turned off. For example, the controller mentioned in the foregoing embodiment may be utilized to control the reflow control apparatus to execute an application program as shown in fig. 4.

Then, in a case where it is decided to use the reflow control apparatus, it is detected whether the first apparatus performs the first job operation. If the first device is detected to be in a stage of executing the first operation, starting a backflow control device; if the first device is detected not to be in the stage of executing the first operation, the backflow control device is closed, so that the first device still operates according to the original state (the state when the backflow control device is not set). For example, the detecting means refers to the control device mentioned in the previous embodiment, and the control device detects the working state of the first device by using the first pressure sensor and the second pressure sensor.

In the above-mentioned hydraulic control method, the structure of the hydraulic control system can be referred to the related description in the foregoing embodiments (for example, the embodiments shown in fig. 1 to fig. 2), and will not be described again here.

It should be noted that the combination of the features in the present application is not limited to the combination described in the claims or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.

It should be noted that the above listed embodiments are only specific examples of the present application, and obviously the present application is not limited to the above embodiments, and many similar variations follow. All modifications which would occur to one skilled in the art and which are, therefore, directly derivable or suggested by the disclosure herein are to be included within the scope of the present application.

It should be understood that the terms first, second, etc. used in the embodiments of the present application are only used for clearly describing the technical solutions of the embodiments of the present application, and are not used to limit the protection scope of the present application.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modifications, equivalents and the like that are within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A hydraulic control system, comprising:

a pump including an output channel to output a fluid;

a first device connected to the output channel to perform a work operation driven by the fluid output from the pump;

a second device connected to the output channel to perform a work operation under the supply of the fluid output by the pump;

a backflow control device connected between the output channel and the first device;

wherein the first device discharges the fluid and the backflow control device is opened to guide the fluid discharged from the first device to the output passage and supply the fluid to the second device when the first device performs the first working operation.

2. The hydraulic control system of claim 1, further comprising a control device in signal connection with the return flow control device and the first device, wherein,

when the control device detects that the first device is executing the first work operation, the control device controls the backflow control device to be started;

the control device controls the backflow control device to be turned off when the control device detects that the first device is not performing the first work operation.

3. The hydraulic control system of claim 2, wherein the first means comprises:

a first chamber in communication with the backflow control device;

a second chamber in communication with the output channel;

an execution mechanism configured to execute the first work operation;

the first chamber and the second chamber drive the actuator to move through pressure difference, and when the actuator performs the first working operation, the pressure of the first chamber is changed from being lower than that of the second chamber to being higher than that of the second chamber.

4. The hydraulic control system of claim 3, wherein the control device comprises:

the controller is in signal connection with the backflow control device;

a first pressure sensor located in the first chamber and/or a second pressure sensor located in the second chamber, the first pressure sensor and/or the second pressure sensor in signal connection with the controller;

wherein the controller is configured to detect a pressure state of the first chamber and/or the second chamber based on the first pressure sensor and/or the second pressure sensor to determine whether the first device is in performing the first work operation stage.

5. The hydraulic control system of claim 4, further comprising:

a storage tank that supplies the fluid to the pump;

a first relief valve located on the first chamber, the first relief valve being configured to allow fluid from the first chamber to escape to the storage tank through the first relief valve when the first device performs the first work operation;

wherein the first device maintains a lower limit pressure of the first chamber at a first preset pressure during the first operation, the controller controls the lower limit pressure of the first chamber at a second preset pressure when the backflow control device is turned on,

the preset opening pressure of the first overflow valve is greater than the second preset pressure, and the second preset pressure is greater than the first preset pressure.

6. The hydraulic control system of claim 4, further comprising:

a third pressure sensor in signal connection with the controller and configured to detect a pressure of the output channel;

wherein the controller is configured to adjust an opening degree of the backflow control device when the backflow control device is opened according to the pressure of the output channel and the pressure of the first chamber; and/or

The controller is in signal connection with the pump, and the controller is configured to adjust the output power of the pump according to the pressure of the output channel and the pressure of the first chamber.

7. The hydraulic control system of claim 2,

the backflow control device comprises a valve and a first pipeline, one end of the first pipeline is connected to the first device, the other end of the first pipeline is connected to the output channel, the valve is configured to control the conduction of the first pipeline, and the control device controls the opening degree of the valve.

8. The hydraulic control system according to claim 1, characterized in that the backflow control device includes a second relief valve and a second pipe, one end of the second pipe is connected to the second relief valve, the other end of the second pipe is connected to the output passage, the second relief valve is connected to the first device, and

the first device maintains the lower limit pressure of overflow generated in the first operation as a first preset pressure, and the preset opening pressure of the second overflow valve is greater than the first preset pressure.

9. The hydraulic control system of claim 8, further comprising:

a storage tank that supplies the fluid to the pump;

a first relief valve for allowing fluid of the first chamber to escape to the storage tank through the first relief valve when the first device performs the first working operation;

the preset opening pressure of the first overflow valve is greater than the preset opening pressure of the second overflow valve.

10. A mechanical device, characterized by comprising a hydraulic control system according to any one of claims 1 to 9.