A hydraulic device and an energy-saving hydraulic control system thereof based on dynamic pressure holding

Abstract

The utility model provides a kind of hydraulic equipment and its energy-saving hydraulic control system based on dynamic pressure keeping, it is related to hydraulic system technical field.Energy-saving hydraulic control system is applied to hydraulic equipment, and hydraulic equipment includes executing mechanism, in energy-saving hydraulic control system, brake control valve group is used to control the action of executing mechanism;Power assembly is used to provide hydraulic oil for brake control valve group;Pressure stabilizing assembly includes energy accumulator and direction control valve, power assembly, direction control valve, brake control valve group are sequentially communicated to form system main oil circuit, and brake control valve group's working oil port is communicated in the oil inlet of executing mechanism, direction control valve is used to limit the forward flow of hydraulic oil to executing mechanism and cannot reverse flow to power assembly, energy accumulator is arranged between the outlet of direction control valve and the pressure oil port of brake control valve group, for storing and releasing hydraulic oil to provide brake control valve group, the system response speed is faster, maximum possible avoids transient pressure loss situation.

Description

Technical Field

[0001] This application relates to the field of hydraulic system technology, and more specifically, to a hydraulic device and its energy-saving hydraulic control system based on dynamic pressure maintenance. Background Technology

[0002] When existing hydraulic systems are used in equipment such as construction machinery and heavy vehicles, they generally rely on hydraulic pumps for oil supply. However, after the control signal is input, the system pressure build-up time is often long. In other words, the action of the actuator will be delayed, and the operational accuracy and safety are difficult to guarantee. Moreover, if the hydraulic pump fails, the system may lose pressure instantly, which poses a great threat to production safety.

[0003] In summary, how to improve system response performance while avoiding instantaneous pressure loss is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a hydraulic device and its energy-saving hydraulic control system based on dynamic pressure maintenance. This system has a fast response speed and avoids instantaneous pressure loss as much as possible. In addition, as defined in the hydraulic device and its energy-saving hydraulic control system based on dynamic pressure maintenance, when the system is working, on the one hand, the accumulator can dynamically switch between stable and charging states during both the action execution phase and the energy consumption control phase; on the other hand, the pressure stabilization component, which includes a directional control valve and a relief valve, can stabilize the pressure of the accumulator in the power component, and then stabilize the pressure of the actuator through the accumulator, thereby achieving pressure maintenance; furthermore, the pressure stabilization component, which includes a directional control valve and a relief valve, can reduce the useless power consumption during the energy consumption control phase, thereby achieving energy saving.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] An energy-saving hydraulic control system based on dynamic pressure maintenance is applied to hydraulic equipment, the hydraulic equipment including an actuator, and the energy-saving hydraulic control system includes:

[0007] A brake control valve assembly is used to control the action of the actuator;

[0008] A power unit for supplying hydraulic fluid to the brake control valve assembly;

[0009] The pressure stabilization component includes an accumulator and a directional control valve. The power component, the directional control valve, and the brake control valve assembly are sequentially connected to form the main oil circuit of the system. The working port of the brake control valve assembly is connected to the oil inlet of the actuator. The directional control valve is used to restrict the forward flow of hydraulic oil to the actuator and prevent it from flowing backward to the power component. The accumulator is located between the outlet of the directional control valve and the pressure port of the brake control valve assembly, and is used to store and release hydraulic oil to supply the brake control valve assembly.

[0010] Preferably, the pressure stabilizing component further includes an overflow valve;

[0011] The inlet of the relief valve is connected to the inlet of the directional control valve, and the outlet of the relief valve is connected to the oil tank in the power assembly.

[0012] The pilot port of the overflow valve is connected between the outlet of the directional control valve and the accumulator.

[0013] Preferably, the brake control valve assembly includes a three-position three-way directional valve;

[0014] When the three-position three-way directional valve is in the working position, its pressure port is connected to the working port.

[0015] When the three-position three-way directional valve is in the normal position, its return port is connected to the working port.

[0016] When the three-position three-way directional valve is in the buffer position, its pressure port, return port, and working port are all closed.

[0017] The actuator is a hydraulic cylinder, and the rodless chamber of the hydraulic cylinder is connected to the working port of the three-position three-way directional valve.

[0018] Preferably, the directional control valve is a one-way valve.

[0019] Preferably, the power assembly includes a hydraulic pump and a filter, with the filter located at the outlet of the hydraulic pump.

[0020] Preferably, it also includes a pressure detection component and a control unit;

[0021] The pressure detection component includes a first pressure sensor, which is located in the main oil circuit of the system and is used to detect the working pressure entering the energy-saving hydraulic control system.

[0022] The control unit is connected to the first pressure sensor and to the hydraulic pump to receive system pressure signals and control the operation of the hydraulic pump.

[0023] Preferably, the pressure detection assembly further includes a second pressure sensor, which is disposed in the accumulator and used to detect the working pressure of the accumulator;

[0024] The control unit is connected to the second pressure sensor to receive the accumulator pressure signal, and the control unit is also used to issue an alarm when the energy-saving hydraulic control system malfunctions.

[0025] And / or, the control unit is also signal-connected to the relief valve to adjust the set pressure of the relief valve.

[0026] Preferably, the power assembly further includes a replenishing pump, which is a variable pump, and the outlet of the replenishing pump is connected to the accumulator to provide hydraulic oil to the accumulator;

[0027] The control unit is connected to the oil replenishment pump and is used to control the operation of the oil replenishment pump.

[0028] Preferably, the number of the brake control valve assemblies is greater than or equal to two;

[0029] Several groups of the brake control valves are connected to the power assembly via a flow distribution valve, which is used to distribute hydraulic oil to several groups of the brake control valves according to a target ratio.

[0030] Several sets of the brake control valve groups are used to connect to the corresponding actuators and to control the operation of the corresponding actuators.

[0031] A hydraulic device comprising the energy-saving hydraulic control system based on dynamic pressure maintenance as described in any of the preceding claims.

[0032] In this application, the power assembly, directional control valve, and brake control valve group are sequentially connected to form the main oil circuit of the system. The oil inlet of the actuator is connected to the working oil port of the brake control valve group. The energy-saving hydraulic control system can then provide the actuator with the hydraulic oil required for operation. The oil port of the accumulator is connected between the outlet of the directional control valve and the pressure oil port of the brake control valve group. The power assembly can charge the accumulator. Conversely, under the restriction of the directional control valve, the hydraulic oil stored in the accumulator can be provided to the brake control valve group to drive the actuator.

[0033] When the system is in the accumulator charging phase, if the pressure is insufficient, the hydraulic oil supplied by the power unit is delivered into the accumulator. After the pressure reaches the target, the brake control valve group is operated to adjust the system to the action execution phase. If the power unit is working normally, the hydraulic pump and the accumulator simultaneously supply oil to the brake control valve group, greatly improving the system response speed. The accumulator can also counteract the pressure fluctuations caused by the periodic pulsation characteristics of the power unit during operation, greatly improving the system stability. If the power unit fails, the accumulator acts as an emergency oil source, independently supplying oil to the brake control valve group to maintain the operating pressure of the actuator and effectively avoid instantaneous pressure loss. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0035] Figure 1 A simplified hydraulic diagram of the specific embodiments provided in this application;

[0036] Figure 2 This is a schematic diagram of the hydraulic principle of the specific embodiments provided in this application;

[0037] Figure 3 A schematic diagram of the normal operation state during the action execution phase of a specific embodiment provided in this application;

[0038] Figure 4 A schematic diagram of the emergency action state during the action execution phase of a specific embodiment provided in this application;

[0039] Figure 5 A schematic diagram of the charging state during the charging stage of the energy storage device in a specific embodiment provided in this application;

[0040] Figure 6 A schematic diagram showing the fully charged state during the charging stage and the energy consumption control state during the pressure stabilization stage of the energy storage device in the specific embodiments provided in this application.

[0041] Figure 7 A simplified hydraulic diagram of the configuration of the replenishing pump in the specific embodiments provided in this application;

[0042] Figure 8 A simplified hydraulic diagram of the flow distribution valve configured in the specific embodiments provided in this application;

[0043] Figure 9 Another hydraulic diagram of the configuration flow distribution valve for the specific embodiments provided in this application.

[0044] Figure label:

[0045] 1-Executive agency;

[0046] 2-Brake control valve assembly; 3-Power assembly; 31-Hydraulic pump; 32-Filter; 33-Oil tank; 4-Pressure stabilization assembly; 41-Accumulator; 42-Directional control valve; 43-Relief valve; 5-Maintenance pump; 6-Flow distribution valve. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] The core of this application is to provide a hydraulic device and its energy-saving hydraulic control system based on dynamic pressure maintenance. This system has a fast response speed and avoids instantaneous pressure loss as much as possible.

[0049] This application provides an energy-saving hydraulic control system based on dynamic pressure maintenance, applied to hydraulic equipment. The hydraulic equipment includes an actuator 1, and the energy-saving hydraulic control system includes a brake control valve group 2, a power component 3, and a pressure stabilizing component 4. The brake control valve group 2 controls the movement of the actuator 1; the power component 3 supplies hydraulic oil to the brake control valve group 2; the pressure stabilizing component 4 includes an accumulator 41 and a directional control valve 42. The power component 3, the directional control valve 42, and the brake control valve group 2 are sequentially connected to form the main oil circuit of the system. The working port of the brake control valve group 2 is connected to the inlet of the actuator 1. The directional control valve 42 restricts the forward flow of hydraulic oil to the actuator 1 and prevents it from flowing backward to the power component 3. The accumulator 41 is located between the outlet of the directional control valve 42 and the pressure port of the brake control valve group 2, and is used to store and release hydraulic oil to supply the brake control valve group 2.

[0050] refer to Figure 1 As explained, the power assembly 3, the directional control valve 42, and the brake control valve group 2 are sequentially connected to form the main oil circuit of the system. The oil inlet of the actuator 1 is connected to the working oil port of the brake control valve group 2, so that the energy-saving hydraulic control system can provide the hydraulic oil required for the actuator 1 to work. The oil port of the accumulator 41 is connected between the outlet of the directional control valve 42 and the pressure oil port of the brake control valve group 2, so the power assembly 3 can charge the accumulator 41. Conversely, under the restriction of the directional control valve 42, the hydraulic oil stored in the accumulator 41 can be provided to the brake control valve group 2 to drive the actuator 1.

[0051] In summary, for reference Figure 2 As explained, when the system is in the charging stage of accumulator 41, if the pressure is insufficient, such as... Figure 5 As shown, the hydraulic oil supplied by the power component 3 is delivered into the accumulator 41. After the pressure reaches the target, the brake control valve group 2 is operated to adjust the system to the action execution stage. If the power component 3 is working normally, the hydraulic pump 31 and the accumulator 41 simultaneously supply oil to the brake control valve group 2, which greatly improves the system response speed. The accumulator 41 can also offset the pressure fluctuations caused by the periodic pulsation characteristics of the power component 3 during operation, which greatly improves the stability of the system. If the power component 3 fails, the accumulator 41 acts as an emergency oil source and independently supplies oil to the brake control valve group 2 to maintain the action pressure of the actuator 1, effectively avoiding the occurrence of instantaneous pressure loss.

[0052] It should be noted that the type of actuator 1 is not limited, as long as it is compatible with the system. In some embodiments, actuator 1 refers to... Figure 1 The hydraulic cylinder shown can control the extension and retraction of actuator 1 through this system; in some embodiments, actuator 1 may refer to a hydraulic caliper.

[0053] refer to Figure 1 As can be seen, based on the above embodiment, the pressure stabilizing component 4 also includes an overflow valve 43; the inlet of the overflow valve 43 is connected to the inlet of the directional control valve 42, and the outlet of the overflow valve 43 is connected to the oil tank 33 in the power component 3; the pilot port of the overflow valve 43 is connected between the outlet of the directional control valve 42 and the accumulator 41.

[0054] With this setup, when the system is in the charging phase of accumulator 41, and the pressure reaches the target, such as... Figure 6 As shown, under the oil pressure of the accumulator 41 locked by the directional control valve 42, the relief valve 43 opens to unload, thus forming a dynamic pressure coordination control mechanism between the relief valve 43 and the directional control valve 42. The pilot port of the relief valve 43 always maintains the relief pressure, achieving the effect of overflow on the front side and pressure maintenance on the rear side of the directional control valve 42. The energy consumption control state or standby state during the system pressure stabilization phase is similar. Figure 6 As shown, in both states, the hydraulic oil supplied by the power component 3 flows directly back to the oil tank 33 through the overflow valve 43, effectively avoiding continuous high-pressure discharge loss of the system.

[0055] Based on the above embodiments, the brake control valve group 2 includes a three-position three-way directional valve; when the three-position three-way directional valve is in the working position, its pressure port is connected to the working port. When the system is a braking system, pressing the brake causes the three-position three-way directional valve to be in the working position. At this time, oil enters the rodless chamber of the cylinder, which is the actuator 1, to achieve braking; when the three-position three-way directional valve is in the normal position, its return port is connected to the working port; when the three-position three-way directional valve is in the buffer position, its pressure port, return port, and working port are all closed; the actuator 1 is a hydraulic cylinder, and the rodless chamber of the hydraulic cylinder is connected to the working port of the three-position three-way directional valve.

[0056] refer to Figure 1 As explained, the three working positions of the three-position three-way directional valve from top to bottom are the working position, the buffer position, and the normal position. The actuator 1 is a hydraulic cylinder. The rodless chamber of the hydraulic cylinder is connected to the working port of the three-position three-way directional valve. The pressure port of the three-position three-way directional valve is connected to the accumulator 41, and the return port is connected to the oil tank 33 of the power assembly 3.

[0057] When using, fully depress the brake pedal to operate the three-position three-way directional valve to the working position, such as... Figure 3 and Figure 4 As shown, the hydraulic oil supplied by the power assembly 3 and the accumulator 41 is sequentially delivered to the rodless chamber of the hydraulic cylinder through the brake control valve assembly 2, causing the piston of the hydraulic cylinder to extend to achieve the braking function. When the brake pedal is initially depressed but not fully depressed to operate the three-position three-way directional valve to the buffer position, the hydraulic cylinder will remain in the current position, and the pressure in the system will remain stable. Conversely, after the brake pedal is released, the three-position three-way directional valve returns to the normal position, and the system state can be as follows: Figure 5 or Figure 6 The state shown.

[0058] refer to Figure 1 Note that in some embodiments, the directional control valve 42 is a one-way valve. Of course, the directional control valve 42 is not limited to the one-way valve described above, and may also be a shuttle valve, a check valve, or a flow restrictor valve, etc.

[0059] refer to Figure 1 As can be seen, in some embodiments, the power assembly 3 includes a hydraulic pump 31 and a filter 32, the filter 32 being located at the outlet of the hydraulic pump 31 to keep the hydraulic oil clean, thereby ensuring normal system operation and extending service life.

[0060] Based on the above embodiments, a pressure detection component and a control unit are also included; the pressure detection component includes a first pressure sensor, which is located in the main oil circuit of the system and is used to detect the working pressure entering the energy-saving hydraulic control system; the control unit signal can be connected to the electronic control unit ECU to drive the engine of the hydraulic pump 31 to control the engine speed, thereby controlling the operation of the hydraulic pump 31.

[0061] During operation, the first pressure sensor detects the system pressure in real time, providing pressure data to the control unit for system regulation. This allows the control unit to start, stop, or adjust the power of the hydraulic pump 31 when the system pressure changes.

[0062] In some embodiments, when the brake pedal is fully depressed to operate the three-position three-way directional valve to the working position, a sudden drop in system pressure can be detected by the first pressure sensor. Then, the control unit controls the hydraulic pump 31 to start, which can provide hydraulic oil to the brake control valve group 2 to drive the actuator 1.

[0063] In some embodiments, when a system pressure increase is detected by a first pressure sensor, the power of the hydraulic pump 31 is increased by the control unit to supply oil efficiently.

[0064] Based on the above embodiments, the pressure detection assembly further includes a second pressure sensor, which is disposed in the accumulator 41 and is used to detect the working pressure of the accumulator 41; the control unit is signal-connected to the second pressure sensor to receive the pressure signal of the accumulator 41, and the control unit is also used to issue an alarm when the energy-saving hydraulic control system malfunctions; and / or, the control unit is also signal-connected to the relief valve 43 to adjust the set pressure of the relief valve 43.

[0065] In some embodiments, during the charging phase of the accumulator 41, after the second pressure sensor detects that the working pressure of the accumulator 41 remains stable, i.e., after entering the energy consumption control phase, the opening of the relief valve 43 can be maximized to reduce the resistance of hydraulic oil flowing out through the relief valve 43. Alternatively, when the hydraulic pump 31 is a variable pump, the hydraulic pump 31 can be stopped by the control unit.

[0066] In some embodiments, after the rated operating pressure of the accumulator 41 is detected by the second pressure sensor, the pressure setting value of the relief valve 43 is adjusted accordingly. This allows for flexible adjustment of the setting value of the relief valve 43 at different stages to meet specific needs at different stages. For example, when the system is in the charging stage of the accumulator 41, the setting pressure of the relief valve 43 can be increased to bring it closer to the closed state, thereby improving the charging efficiency of the accumulator 41. Furthermore, the setting value of the relief valve 43 can be dynamically adjusted according to changes in system pressure to achieve more precise pressure control.

[0067] In some embodiments, the control unit has an alarm function, such as integrating a pop-up window, flashing light, or buzzer. Based on the detection results of the first pressure sensor and the second pressure sensor, after determining that an abnormality has occurred in the system, an alarm is issued to remind the operator.

[0068] refer to Figure 7 As can be seen, based on the above embodiment, the power assembly 3 also includes a replenishing pump 5, which is a variable pump. The outlet of the replenishing pump 5 is connected to the accumulator 41 to provide hydraulic oil to the accumulator 41. The control unit signal is connected to the replenishing pump 5 to control the operation of the replenishing pump 5.

[0069] In some embodiments, during system operation, when the second pressure sensor detects that the working pressure of the accumulator 41 is lower than the target threshold, the replenishing pump 5 is started, which can quickly charge the accumulator 41. When the hydraulic pump 31 is working normally, the replenishing pump 5 replenishes the accumulator 41, which can improve the charging speed of the accumulator 41 and help ensure the pressure stability of the accumulator 41. When the hydraulic pump 31 fails, the replenishing pump 5 replenishes the accumulator 41, which can prevent the accumulator 41 from failing, further improving safety. The replenishing pump 5 can also be controlled to achieve flow regulation, so as to charge the accumulator 41 as needed and reduce system pressure fluctuations.

[0070] Based on the above embodiments, the number of brake control valve groups 2 is greater than or equal to two; several groups of brake control valve groups 2 are connected to the power assembly 3 through flow distribution valves 6, which are used to distribute hydraulic oil to several brake control valve groups 2 according to a target ratio; several groups of brake control valve groups 2 are used to connect to the corresponding actuators 1 and to control the action of the corresponding actuators 1.

[0071] Optionally, in some embodiments, when the target action pressures of several actuators 1 are not equal, reference is made. Figure 8As explained, a flow distribution valve 6 is provided on the outlet side of the power assembly 3. Specifically, the inlet of the flow distribution valve 6 is connected to the outlet of the power assembly 3, so that the hydraulic oil provided by the power assembly 3 can be distributed according to the target ratio. Several sets of brake control valve groups 2 are paired with several sets of pressure stabilizing components 4, that is, the pressure oil ports of several sets of brake control valve groups 2 are connected to the corresponding outlets of the flow distribution valve 6, so that hydraulic oil can be provided to several sets of brake control valve groups 2 according to the target ratio to meet the working requirements of different actuators 1. Furthermore, the pressure stabilizing components 4 can ensure the high-speed response of the corresponding actuators 1 and ensure the pressure stability of each circuit of the system, and can avoid the occurrence of instantaneous pressure loss as much as possible.

[0072] Optionally, in some embodiments, when the target action pressure of a plurality of actuators 1 is equal, reference is used. Figure 9 As explained, a flow distribution valve 6 is provided on the outlet side of the brake control valve group 2. Specifically, the inlet of the flow distribution valve 6 is connected to the outlet of the brake control valve group 2, so that the hydraulic oil flowing through the brake control valve group 2 can be evenly distributed. Several actuators 1 are connected to the corresponding outlets of the flow distribution valve 6, so that hydraulic oil can be evenly supplied to several actuators 1 to meet the working requirements of different actuators 1, enabling them to respond at high speed. Through the shared accumulator 41, the pressure stability of each circuit of the system can still be guaranteed, and the occurrence of instantaneous pressure loss can be avoided as much as possible.

[0073] Of course, the system configuration is not limited to the two examples mentioned above. As long as the oil supply needs of several actuators are met, it can prevent the occurrence of instantaneous pressure loss.

[0074] In summary, as defined in the hydraulic equipment and its energy-saving hydraulic control system based on dynamic pressure maintenance, when the system is working, on the one hand, the accumulator 41 can dynamically switch between stable and charged states during both the action execution phase and the energy consumption control phase; on the other hand, the pressure stabilizing component 4, which includes the directional control valve 42 and the relief valve 43, can stabilize the pressure of the power component 3 in the accumulator 41, thereby stabilizing the pressure of the actuator through the accumulator 41, thus achieving pressure maintenance; furthermore, the pressure stabilizing component, which includes the directional control valve 42 and the relief valve 43, can reduce the useless power consumption during the energy consumption control phase, thereby achieving energy saving.

[0075] In addition to the energy-saving hydraulic control system based on dynamic pressure maintenance described above, this application also provides a hydraulic device that includes the energy-saving hydraulic control system based on dynamic pressure maintenance disclosed in the above embodiments. The hydraulic device can refer to a cotton harvester or other equipment that needs to be configured with a hydraulic system. For the structure of other parts of the hydraulic device, please refer to the prior art, which will not be described in detail here.

[0076] It should be noted that the relational terms such as "first" and "second" mentioned above are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities; the terms "upper surface," "lower surface," "top," and "bottom" and the directional terms "upper," "lower," "left," and "right" mentioned above are defined based on the accompanying drawings in the specification.

[0077] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0078] The hydraulic equipment and its energy-saving hydraulic control system based on dynamic pressure maintenance provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. An energy-saving hydraulic control system based on dynamic pressure maintenance, characterized in that, Applied to hydraulic equipment, the hydraulic equipment includes an actuator (1), and the energy-saving hydraulic control system includes: Brake control valve assembly (2) is used to control the action of the actuator (1); The power assembly (3) is used to supply hydraulic oil to the brake control valve assembly (2); The pressure stabilizing component (4) includes an accumulator (41) and a directional control valve (42). The power component (3), the directional control valve (42), and the brake control valve group (2) are connected in sequence to form the main oil circuit of the system. The working oil port of the brake control valve group (2) is connected to the oil inlet of the actuator (1). The directional control valve (42) is used to restrict the hydraulic oil to flow forward to the actuator (1) and not to flow backward to the power component (3). The accumulator (41) is located between the outlet of the directional control valve (42) and the pressure oil port of the brake control valve group (2) for storing and releasing hydraulic oil to supply the brake control valve group (2).

2. The energy-saving hydraulic control system based on dynamic pressure maintenance according to claim 1, characterized in that, The pressure stabilizing component (4) also includes an overflow valve (43); The inlet of the overflow valve (43) is connected to the inlet of the directional control valve (42), and the outlet of the overflow valve (43) is connected to the oil tank (33) in the power assembly (3). The pilot port of the overflow valve (43) is connected between the outlet of the directional control valve (42) and the accumulator (41).

3. The energy-saving hydraulic control system based on dynamic pressure maintenance according to claim 1 or 2, characterized in that, The brake control valve group (2) includes a three-position three-way directional valve; When the three-position three-way directional valve is in the working position, its pressure port is connected to the working port. When the three-position three-way directional valve is in the normal position, its return port is connected to the working port. When the three-position three-way directional valve is in the buffer position, its pressure port, return port, and working port are all closed. The actuator (1) is a hydraulic cylinder, and the rodless chamber of the hydraulic cylinder is connected to the working port of the three-position three-way directional valve.

4. The energy-saving hydraulic control system based on dynamic pressure maintenance according to claim 1 or 2, characterized in that, The directional control valve (42) is a one-way valve.

5. The energy-saving hydraulic control system based on dynamic pressure maintenance according to claim 2, characterized in that, The power unit (3) includes a hydraulic pump (31) and a filter (32), the filter (32) being located at the outlet of the hydraulic pump (31).

6. The energy-saving hydraulic control system based on dynamic pressure maintenance according to claim 5, characterized in that, It also includes a pressure detection component and a control unit; The pressure detection component includes a first pressure sensor, which is located in the main oil circuit of the system and is used to detect the working pressure entering the energy-saving hydraulic control system. The control unit is connected to the first pressure sensor and to the hydraulic pump (31) to receive system pressure signals and control the operation of the hydraulic pump (31).

7. The energy-saving hydraulic control system based on dynamic pressure maintenance according to claim 6, characterized in that, The pressure detection assembly further includes a second pressure sensor, which is located in the accumulator (41) and is used to detect the working pressure of the accumulator (41). The control unit is connected to the second pressure sensor to receive the pressure signal of the accumulator (41), and the control unit is also used to issue an alarm when the energy-saving hydraulic control system malfunctions. And / or, the control unit is also signal-connected to the relief valve (43) to be able to adjust the set pressure of the relief valve (43).

8. The energy-saving hydraulic control system based on dynamic pressure maintenance according to claim 7, characterized in that, The power assembly (3) also includes a replenishing pump (5), which is a variable pump. The outlet of the replenishing pump (5) is connected to the accumulator (41) to provide hydraulic oil to the accumulator (41). The control unit is connected to the oil replenishment pump (5) and is used to control the operation of the oil replenishment pump (5).

9. The energy-saving hydraulic control system based on dynamic pressure maintenance according to claim 6, characterized in that, The number of each brake control valve group (2) is greater than or equal to two; Several sets of the brake control valve groups (2) are connected to the power assembly (3) through a flow distribution valve (6), which is used to distribute hydraulic oil to several sets of the brake control valve groups (2) according to a target ratio. Several sets of brake control valve groups (2) are used to connect to the corresponding actuators (1) and to control the operation of the corresponding actuators (1).

10. A hydraulic device, characterized in that, The energy-saving hydraulic control system based on dynamic pressure maintenance as described in any one of claims 1-9 above.

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