A hydraulic flow distribution module, a hydraulic system and a hydraulic flow distribution method

Abstract

The present invention relates to the fields of hydraulic and electronic control, and particularly relates to a hydraulic flow distribution module, a hydraulic system, and a hydraulic flow distribution method. A hydraulic flow distribution module is connected to a hydraulic system. The hydraulic flow distribution module includes a distribution valve body and a distribution spool. An oil passage is formed in the distribution valve body to communicate with a hydraulic oil passage in the hydraulic system. The distribution spool is slidably assembled in the distribution valve body. A pressure regulating unit is provided at one end of the distribution spool. The pressure difference between the pressure oil passage and the load sensing oil passage of the hydraulic system interacts with the pressure regulating unit to control the distribution spool to slide along the distribution valve body. The distribution spool slidingly controls the on-off of the pilot oil passage X and the drain oil passage Y of the hydraulic system. It solves the technical problem that in the case of flow saturation in the prior art hydraulic system, the combined actions of multiple actuators are not coordinated.

Description

Technical Field

[0001] The present invention relates to the fields of hydraulic and electronic control, and particularly relates to a hydraulic flow distribution module, a hydraulic system, and a hydraulic flow distribution method. Background Art

[0002] The load sensing technology is widely applied to various construction machinery. The main reason is its good energy-saving performance. The hydraulic pump can provide corresponding flow according to the system demand. The required flow of the system is not affected by the load pressure. And when the main valve is in the middle position, low-pressure overflow can be achieved, thereby reducing the power loss of the system. At present, with the accelerating pace of social development, the requirements for construction machinery are not only limited to basic working performances such as energy-saving, safe and reliable. How to improve the operation efficiency has become the key point of the optimized design, especially the reasonable design of compound actions.

[0003] Taking an aerial work platform as an example, it has basic actions such as the whole machine traveling, the upper vehicle slewing, telescoping, luffing, and leveling. To meet the needs of actual working conditions, the compound of the foregoing basic actions can effectively improve the operation efficiency and stability of the aerial work platform, thus greatly shortening the working time and meeting the requirements of different users. Since the working principle of the compound action is that one pump supplies high-pressure oil to two loads at the same time, therefore, on the premise that the total flow of the hydraulic oil is certain, the oil should be supplied to each load according to the demand of the actuators. However, for the traditional load sensing system (LS system) that realizes compound actions, there are certain defects in the use process. For example, when the system needs to realize the simultaneous actions of multiple actuators, if the maximum flow supplied by the hydraulic pump is less than the total flow required by the system, the load sensing system will lose its load sensing function and cannot achieve the on-demand distribution of saturated flow.

[0004] In order to meet the diverse needs of mechanical equipment, based on the load sensing hydraulic technology, this application has developed and designed a hydraulic flow distribution module and a control strategy, making the hydraulic multi-way valve more versatile, especially making the compound actions of multiple actuators more coordinated, and reducing the cost and energy consumption. Summary of the Invention

[0005] In order to solve the technical problem that the compound actions of multiple actuators are not coordinated in the existing hydraulic system under the condition of flow saturation, the present invention provides a hydraulic flow distribution module, a hydraulic system, and a hydraulic flow distribution method, which solve the above technical problems. The technical solution of the present invention is as follows:

[0006] A hydraulic flow distribution module is connected to a hydraulic system. The hydraulic flow distribution module includes a distribution valve body and a distribution spool. An oil passage is formed in the distribution valve body to connect to the hydraulic oil passage in the hydraulic system. The distribution spool is slidably assembled in the distribution valve body. A pressure regulating unit is provided at one end of the distribution spool. The pressure difference between the pressure oil passage and the load sensing oil passage of the hydraulic system interacts with the pressure regulating unit to control the sliding of the distribution spool along the distribution valve body, and the sliding of the distribution spool controls the on-off of the pilot oil passage X and the drain oil passage Y of the hydraulic system.

[0007] For the hydraulic flow distribution module of the present invention, when applied to a hydraulic system, the distribution spool slides along the distribution valve body under the interaction of the pressure difference between the pressure oil passage and the load sensing oil passage of the hydraulic system and the pressure regulating unit. The sliding of the distribution spool is used to control the on-off and opening size of the pilot oil passage and the drain oil passage of the hydraulic system. The change in the oil pressure of the pilot oil passage will act on the corresponding control valve of the actuator in the hydraulic system, and then control the flow rate entering the actuator. In this way, the flow rate of the actuator can be affected by the interaction of the pressure difference between the pressure oil passage and the load sensing oil passage and the pressure regulating unit. When the flow rate output by the hydraulic pump cannot meet the flow rate requirements of multiple actuators, through the automatic adjustment of the hydraulic flow distribution module, the combined actions of the actuators are prevented from being out of balance. At this time, the pressure difference between the pressure oil passage and the load sensing oil passage interacts with the pressure regulating component, making the distribution spool in a dynamic balance process in the distribution valve body, and the pilot oil passage X and the drain oil passage Y are also in a real-time on-off state, used to adjust the oil pressure of the pilot oil passage X, so that the combined actions of the actuator are more coordinated.

[0008] According to an embodiment of the present invention, a first pilot cavity is formed at the first end of the distribution spool, and the pressure regulating unit is assembled at the second end of the distribution spool and a second pilot cavity is formed. The pressure oil passage is connected to the first pilot cavity, and the load sensing oil passage is connected to the second pilot cavity.

[0009] According to an embodiment of the present invention, the distribution spool is in a rod shape, and two outwardly convex cores are formed at intervals on the distribution spool. A communication groove is formed between the adjacent shoulders of the two cores. The oil ports of the two oil passages connecting the pilot oil passage X and the drain oil passage Y in the distribution valve body respectively correspond to the adjacent shoulders of the two cores. When the pressure difference is less than the action of the pressure regulating unit, the distribution spool controls the oil ports of the two oil passages to communicate.

[0010] According to an embodiment of the present invention, the pressure regulating unit includes an adjusting member and an elastic member. The adjusting member is assembled outside the axial direction of the distribution spool with adjustable position, and the two ends of the elastic member act on the adjusting member and the distribution spool respectively.

[0011] According to an embodiment of the present invention, the adjusting member is adjustably assembled on the distribution valve body through a mounting member, the mounting member is fixedly assembled on the distribution valve body, and the adjusting member is in threaded cooperation with the mounting member.

[0012] According to an embodiment of the present invention, a limiting member is provided at one end of the distribution spool valve close to the pressure regulating unit, and the limiting member can abut against the distribution valve body and the mounting member to achieve axial limitation of the distribution spool valve.

[0013] A hydraulic system includes:

[0014] A hydraulic pump that pumps out pressurized oil to the pressure oil circuit P;

[0015] At least two actuators that operate by the supply of pressurized oil from the hydraulic pump, and the pressure of the actuators is fed back to the load sensing oil circuit Ls;

[0016] At least two control valves are provided for each actuator to operate the supply of working oil from the hydraulic pump to the corresponding actuator to respectively control the actions of the hydraulic brakes;

[0017] A pilot oil circuit X and a drain oil circuit Y are communicated with two pilot chambers of the control valve;

[0018] A hydraulic flow distribution module, and the pressure oil circuit P, the load sensing oil circuit Ls, the pilot oil circuit X, and the drain oil circuit Y are respectively communicated with oil passages in the hydraulic flow distribution module.

[0019] According to an embodiment of the present invention, the pilot oil circuit X and the drain oil circuit Y are communicated with two pilot chambers of the control valve under the control of an electromagnetic valve.

[0020] According to an embodiment of the present invention, the hydraulic flow distribution module is omitted, and a controller is further included, and the controller controls the opening degree of the electromagnetic valve by controlling the current of the electromagnetic valve.

[0021] A hydraulic flow distribution method using the above hydraulic system includes the following steps:

[0022] S1. According to the control currents I1, I2... I of the electromagnetic valves corresponding to the actuators n , obtain the theoretical required flow rates Q1, Q2... Q of the actuators n ,

[0023] S2. Calculate the total required flow rate Q 需 =Q1 + Q2 +... + Q n ;

[0024] S3. Obtain the pump output flow rate of the hydraulic pump Wherein, n is the rotational speed of the hydraulic pump, and v is the displacement of the hydraulic pump;

[0025] S4. When Q 需 > Q 泵 , obtain the coefficient k.

[0026] S5. Obtain the actual control currents of the solenoid valves corresponding to each actuator as k·I1, k·I2...k·I n .

[0027] Based on the above technical solutions, the technical effects that the present invention can achieve are as follows:

[0028] 1. When the hydraulic flow distribution module and the hydraulic system of the present invention are applied to a hydraulic system, the distribution spool slides along the distribution valve body under the interaction of the pressure difference between the pressure oil circuit and the load-sensing oil circuit of the hydraulic system and the pressure regulating unit. The sliding of the distribution spool is used to control the on-off and opening size of the pilot oil circuit and the drain oil circuit of the hydraulic system. The change in the oil pressure of the pilot oil circuit will act on the control valve corresponding to the actuator in the hydraulic system, thereby controlling the flow rate entering the actuator. In this way, the flow rate of the actuator can be affected by the interaction of the pressure difference between the pressure oil circuit and the load-sensing oil circuit and the pressure regulating unit. When the flow rate output by the hydraulic pump cannot meet the flow rate requirements of multiple actuators, through the automatic adjustment of the hydraulic flow distribution module, the combined actions of the actuators are prevented from being out of coordination. At this time, the pressure difference between the pressure oil circuit and the load-sensing oil circuit interacts with the pressure regulating component, causing the distribution spool to be in a dynamic balance process in the distribution valve body, and the pilot oil circuit X and the drain oil circuit Y are also in a real-time on-off state, which is used to adjust the oil pressure of the pilot oil circuit X, so that the combined actions of the actuators are more coordinated;

[0029] 2. For the hydraulic flow distribution module and the hydraulic system of the present invention, the structures of the distribution spool and the distribution valve body are reasonably set. When the hydraulic system is not started and the control valve is completely in a non-working state, there is no pressure oil in the pressure oil circuit P and the load-sensing oil circuit Ls. Due to the action of the pressure regulating unit, the distribution spool is at the lowest end. At this time, the opening of the distribution spool is the largest, and the pilot oil circuit X is connected to the drain oil circuit Y; when the hydraulic system is started and the control valve is in a standby working state, there is pressure oil in the pressure oil circuit P and no pressure oil in the load-sensing oil circuit Ls. At this time, the distribution spool overcomes the pressure of the pressure regulating unit, and the distribution spool is at the uppermost end. The pilot oil circuit X is disconnected from the drain oil circuit Y, and pressure oil is established in the pilot oil circuit X; when the hydraulic multi-way valve performs combined actions of multiple actuators and the pump flow rate is saturated, through the automatic adjustment of the hydraulic flow distribution module, the pilot oil circuit X and the drain oil circuit Y are in a real-time on-off state, which is used to adjust the pressure oil of the pilot oil circuit X to prevent the combined actions of the actuators from being out of coordination;

[0030] 3. The hydraulic system and hydraulic flow distribution method of the present invention adopt an electronic control strategy. For a fully electronically controlled hydraulic system, through cooperation with a controller, the coordination and speed of compound actions can also be adjusted in real time. When performing compound actions of multiple actuators and the pump flow is saturated, the currents of each actuator can be controlled to decrease in proportion, so that the speeds of each actuator decrease in proportion to meet the requirements of compound actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 FIG. is a schematic structural diagram of the hydraulic flow distribution module in the initial state of Embodiment 1 of the present invention;

[0032] Figure 2 FIG. is a schematic structural diagram of the hydraulic flow distribution module in the standby working state;

[0033] Figure 3 FIG. is a schematic structural diagram of the distribution spool valve;

[0034] Figure 4 FIG. is a schematic diagram of the principle of the hydraulic flow distribution module in the hydraulic system;

[0035] Figure 5 FIG. is a schematic diagram of the principle of the electronic hydraulic flow distribution method in Embodiment 2 of the present invention;

[0036] In the figure: 1 - hydraulic flow distribution module; 11 - distribution valve body; 111 - pressure oil port; 112 - sensitive oil port; 113 - X oil port; 114 - Y oil port; 12 - distribution spool valve; 121 - first core body; 1122 - second core body; 123 - communication groove; 124 - open oil groove; 13 - sealing plug; 14 - first pilot chamber; 15 - pressure regulating unit; 151 - regulating member; 152 - elastic member; 16 - mounting member; 161 - sealing nut; 17 - second pilot chamber; 18 - limiting member; 2 - first compensation valve; 3 - first reversing valve; 41 - first solenoid valve; 42 - second solenoid valve; 5 - second compensation valve; 6 - second reversing valve; 71 - third solenoid valve; 72 - fourth solenoid valve; P - pressure oil circuit; Ls - load sensing oil circuit; X - pilot oil circuit; Y - drain oil circuit; T - return oil circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation to the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] It should be noted that the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0041] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations during use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, a device described as "above or over other devices or structures" will then be positioned "below or under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0042] In addition, it should be noted that the use of terms such as "first", "second", etc. to define components is only for the convenience of differentiating the corresponding components. Without additional declaration, the above terms have no special meaning, and thus should not be construed as limiting the protection scope of the present invention.

[0043] Embodiment 1

[0044] As Figures 1-4 shown, this embodiment provides a hydraulic flow distribution module 1, which is connected in a hydraulic system, especially in a load-sensitive hydraulic system. The hydraulic flow distribution module 1 includes a distribution valve body 11 and a distribution spool 12. One end of the distribution spool 12 is provided with a pressure regulating unit 15. The distribution spool 12 is slidably assembled in the distribution valve body 11. Under the interaction of the pressure difference between the pressure oil circuit P and the load-sensitive oil circuit Ls of the hydraulic system and the pressure regulating unit 15, the distribution spool 12 slides along the distribution valve body 11 to control the on-off and opening degree of the pilot oil circuit X and the drain oil circuit Y of the hydraulic system, and thus can control the oil pressure of the pilot oil circuit X.

[0045] The distribution valve body 11 is in a block shape, and an installation cavity is formed inside the distribution valve body 11 to slidably assemble the distribution valve core 12. In this embodiment, the installation cavity can be set as a through cavity with openings at both ends. A sealing plug 13 is arranged at one end of the installation cavity, and a pressure regulating unit 15 is arranged at the other end of the installation cavity to form a relatively sealed internal space to accommodate the distribution valve core 12. Preferably, the installation cavity can be a cavity with a variable inner diameter, and the inner diameters at both ends thereof are larger than the inner diameter in the middle. The distribution valve core 12 is in a rod shape, and two outwardly protruding cores are formed at intervals on the middle section of the distribution valve core 12, namely a first core 121 and a second core 122. A communication groove 123 is formed between the first core 121 and the second core 122. The two cores are slidably matched with the middle section of the installation cavity. The two end portions of the distribution valve core 12 respectively extend into the two ends of the installation cavity. A first pilot cavity 14 is formed by a clearance fit between the end portion of the first end of the distribution valve core 12 and the end where the sealing plug 13 of the installation cavity is located. A second pilot cavity 17 is formed by a clearance fit between the end portion of the second end of the distribution valve core 12 and the end where the pressure regulating unit 15 of the installation cavity is located.

[0046] To control the flow distribution of the hydraulic system, multiple oil channels are formed inside the distribution valve body 11 to communicate with the oil circuits in the hydraulic system. Specifically, a pressure oil channel, a sensitive oil channel, an X oil channel, and a Y oil channel are formed in the distribution valve body 11. The pressure oil channel communicates with the pressure oil circuit P in the hydraulic system. The pressure oil port 111 of the pressure oil channel communicates with the first pilot cavity 14. The pressure oil in the pressure oil circuit P can enter the first pilot cavity 14. The sensitive oil channel communicates with the load-sensitive oil circuit Ls in the hydraulic system. The sensitive oil port 112 of the sensitive oil channel communicates with the second pilot cavity 17. The hydraulic oil in the load-sensitive oil circuit Ls can enter the second pilot cavity 17. In this way, the pressure difference between the pressure oil circuit P and the load-sensitive oil circuit Ls interacts with the pressure regulating unit 15 to control the distribution valve core 12 to slide along the distribution valve body 11. The X oil channel communicates with the pilot oil circuit X in the hydraulic system. The X oil port 113 of the X oil channel corresponds to the shoulder of the second core 122 close to the first core 121. The Y oil channel communicates with the oil drain circuit Y in the hydraulic system. The Y oil port 114 of the Y oil channel corresponds to the shoulder of the first core 121 close to the second core 122. When the distribution valve core 12 slides along the distribution valve body 11, the distribution valve core 12 can control the on-off of the X oil channel and the Y oil channel, and further control the on-off of the pilot oil circuit X and the oil drain circuit Y in the hydraulic system to control the oil pressure of the pilot oil circuit X.

[0047] As a preferred technical solution of this embodiment, open oil grooves 124 are formed on the outer peripheral surfaces of the first core 121 and the second core 122 of the distribution valve core 12 to facilitate the flow of oil.

[0048] The pressure regulating unit 15 is arranged at the second end of the distribution spool 12 to regulate the preset pressure of the hydraulic flow distribution module 1. In this embodiment, the pressure regulating unit 15 includes a regulating member 151 and an elastic member 152. The regulating member 151 is assembled on the axial outer side of the distribution spool 12 with adjustable position, and both ends of the elastic member 152 act on the regulating member 151 and the distribution spool 12 respectively. Specifically, the pressure regulating unit 15 is assembled on the distribution valve body 11 through a mounting member 16. The mounting member 16 is a valve sleeve, and the mounting member 16 is threadedly assembled on the distribution valve body 11. A sealing nut 161 is arranged on the axial outer side of the mounting member 16. The regulating member 151 can be a sealing screw. The regulating member 151 extends into the valve sleeve and the sealing nut 161 and is in threaded cooperation with the valve sleeve and the sealing nut 161. The regulating member 151 can be rotated to adjust its axial position on the distribution valve body 11. The elastic member 152 can be, but is not limited to, a spring.

[0049] According to the preferred technical solution of this embodiment, a limiting member 18 is further arranged at the second end of the distribution spool 12. The limiting member 18 can be threadedly sleeved on the second end of the distribution spool 12. The second end of the distribution spool 12 axially protrudes relative to the limiting member 18. The limiting member 18 can abut against the ends of the distribution valve body 11 and the mounting member 16 to limit the sliding range of the distribution spool 12. Preferably, the end of the elastic member 152 is sleeved on the second end of the distribution spool 12 and abuts against the limiting member 18; more preferably, the elastic member 152 is sleeved and abuts against the end of the regulating member 151 close to the distribution spool 12. At least part of the elastic member 152 extends into the interior of the mounting member 16, and the mounting member 16 can also play a role in preventing the elastic member 152 from being distorted.

[0050] This embodiment also provides a hydraulic system, which includes the above-mentioned hydraulic flow distribution module 1, and also includes a hydraulic pump, at least two actuators, at least two control valves, a pilot oil circuit X and a drain oil circuit Y. The hydraulic pump pumps out pressure oil to the pressure oil circuit P. At least two actuators work through the supply of pressure oil from the hydraulic pump. The pressure of the actuators is fed back to the load sensing oil circuit Ls. Each actuator is correspondingly provided with a control valve. In this embodiment, the control valve is a hydraulically controlled valve. The pilot oil circuit X supplies oil to the pilot chamber of the control valve. The hydraulic flow distribution module 1 slides under the interaction of the pressure difference between the pressure oil circuit P and the load sensing oil circuit Ls and the pressure regulating unit 15 to regulate the oil pressure of the pilot oil circuit X, and further controls the on-off and opening degree of each control valve to regulate the flow rate of the pressure oil entering each actuator.

[0051] The pressure oil passage in the hydraulic flow distribution module 1 is connected to the pressure oil circuit P. The pressure oil in the pressure oil circuit P can enter the first pilot chamber 14. The sensitive oil passage is connected to the load sensing oil circuit Ls. The hydraulic oil in the load sensing oil circuit Ls can enter the second pilot chamber 17. The X oil passage is connected to the pilot oil circuit X, and the Y oil passage is connected to the oil drain circuit Y. Taking two actuators as an example, the first actuator corresponds to the first control valve 3, and the second actuator corresponds to the second control valve 6. In this embodiment, the structures of the first control valve 3 and the second control valve 6 are the same. The pilot oil circuit X and the oil drain circuit Y are connected to one pilot chamber of the first control valve 3 through the first solenoid valve 41, and the pilot oil circuit X and the oil drain circuit Y are connected to the other pilot chamber of the first control valve 3 through the second solenoid valve 42; the pilot oil circuit X and the oil drain circuit Y are connected to one pilot chamber of the second control valve 6 through the third solenoid valve 43, and the pilot oil circuit X and the oil drain circuit Y are connected to the other pilot chamber of the second control valve 6 through the fourth solenoid valve 44. The pressure oil on the pressure oil circuit P passes through the first compensation valve 2 to reach the first control valve 3, and under the control of the first control valve 3, it enters the first actuator through the working oil circuit through the oil port A1 (or B1), and the first actuator operates; the pressure oil on the pressure oil circuit P passes through the second compensation valve 5 to reach the second control valve 6, and under the control of the second control valve 6, it enters the second actuator through the working oil circuit through the oil port A2 (or B2), and the second actuator operates.

[0052] Based on the above structure, the working principle of the hydraulic system in this embodiment is as follows:

[0053] When the hydraulic system is not started and the control valve is completely in a non-operating state, there is no pressure oil in the pressure oil circuit P and the load sensing oil circuit Ls. Due to the action of the pressure regulating unit 15, the distribution spool 12 is at the lowermost end and contacts the sealing plug 13. At this time, the opening of the distribution spool 12 is the largest, and the pilot oil circuit X is connected to the oil drain circuit Y.

[0054] When the hydraulic system is started and the control valve is in the standby working state, there is pressure oil in the pressure oil circuit P and no pressure oil in the load sensing oil circuit Ls. At this time, the distribution spool 12 overcomes the pressure of the pressure regulating unit 15, and the distribution spool 12 is at the uppermost end. The distribution spool 12 is limited by the limiting member 18, and the pilot oil circuit X and the oil drain circuit Y are cut off, and pressure oil is established in the pilot oil circuit X.

[0055] When multiple actuators perform combined actions, when the flow rate output by the hydraulic pump cannot meet the flow rate requirements of multiple actuators, through the automatic adjustment of the hydraulic flow distribution module 1, the combined actions of the actuators are prevented from being out of adjustment. At this time, the pressure difference between the pressure oil circuit P and the load sensing oil circuit Ls interacts with the pressure regulating unit 15, so that the distribution spool 12 is in a dynamic balance process in the distribution valve block 11, and the pilot oil circuit X and the oil drain circuit Y are also in a state of real-time on and off, which is used to adjust the pilot oil circuit X, so that the combined actions of the actuators are more coordinated.

[0056] Embodiment 2

[0057] The hydraulic system of this embodiment is basically the same as that of Embodiment 1, except that there is no need to set the hydraulic flow distribution module 1. For the fully electronic control multi-way valve hydraulic system, through an electronic control strategy and in cooperation with the controller, the controller controls the opening of the solenoid valve by controlling the current, and adjusts the coordination and speed of the composite action in real time. When performing a composite action of multiple actuators, when the flow rate output by the hydraulic pump cannot meet the flow rate requirements of multiple actuators, the current of each actuator decreases proportionally, so that the speed of each actuator decreases proportionally to meet the requirements of the composite action.

[0058] As Figure 5 shown, this embodiment provides a hydraulic flow distribution method, which is an electronic control distribution method, including the following steps:

[0059] S1. According to the control currents I1, I2... I n of the solenoid valves corresponding to each actuator, obtain the theoretical required flow rates Q1, Q2... Q n of each actuator,

[0060] S2. Calculate the total required flow rate Q 需 = Q1 + Q2 +... + Q n ;

[0061] S3. Obtain the pumped flow rate of the hydraulic pump where n is the rotational speed of the hydraulic pump and v is the displacement of the hydraulic pump;

[0062] S4. When Q 需 > Q 泵 , obtain the coefficient k,

[0063] S5. Obtain the actual control currents of the solenoid valves corresponding to each actuator as k·I1, k·I2... k·I n .

[0064] For the hydraulic system of this embodiment, taking two actuators as an example, the controller can control the currents of the first solenoid valve 41 and the third solenoid valve 71. The actual control current of the first solenoid valve 41 is k·I1, and the actual control current of the third solenoid valve 71 is k·I2, so that the currents of the two actuators decrease proportionally, and the speeds of each actuator decrease proportionally to meet the requirements of the composite action. In addition, other solenoid valves can also be controlled, as long as one of the two solenoid valves corresponding to each control valve is ensured to be controlled.

[0065] According to the preferred technical solution of this embodiment, the hydraulic flow rate distribution method of this embodiment further includes, before step S1: determining whether there is a composite action, detecting whether there are outputs of control currents of more than two among all actuators, and if so, defining it as a composite action. Only the actuators with control current outputs are involved in the calculation of the actual control current.

[0066] For the electronic control strategy using the same control principle, taking the 2 - way connection as an example, it is not limited to this local electronic control logic. According to the needs of the main machine equipment, the number of parallel actuators can be increased or decreased.

[0067] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above - described embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A hydraulic flow distribution module is connected to a hydraulic system. The hydraulic flow distribution module (1) includes a distribution valve body (11) and a distribution spool (12). An oil passage is formed in the distribution valve body (11) to connect the hydraulic oil passage in the hydraulic system. The distribution spool (12) is slidably assembled in the distribution valve body (11), and is characterized in that, One end of the distribution spool valve (12) is provided with a pressure regulating unit (15). The pressure difference between the pressure oil circuit (P) and the load sensing oil circuit (Ls) of the hydraulic system interacts with the pressure regulating unit (15) to control the distribution spool valve (12) to slide along the distribution valve body (11). The sliding of the distribution spool valve (12) controls the on-off of the pilot oil circuit (X) and the drain oil circuit (Y) of the hydraulic system. The distribution spool valve (12) is in a rod shape. Two convex cores are formed on the distribution spool valve (12) at intervals. A communication groove (123) is formed between the adjacent shoulders of the two cores. The oil ports (113, 114) of the two oil channels connecting the pilot oil circuit (X) and the drain oil circuit (Y) in the distribution valve body (11) respectively correspond to the adjacent shoulders of the two cores. When the pressure difference is less than the action of the pressure regulating unit (15), the distribution spool valve (12) controls the oil ports (113, 114) of the two oil channels to communicate. The pressure regulating unit (15) includes an adjusting member (151) and an elastic member (152). The adjusting member (151) is assembled on the axial outer side of the distribution spool valve (12) with adjustable position. The two ends of the elastic member (152) act on the adjusting member (151) and the distribution spool valve (12) respectively. The adjusting member (151) is assembled on the distribution valve body (11) with adjustable position through a mounting member (16). The mounting member (16) is fixedly assembled on the distribution valve body (11). The adjusting member (151) is in threaded fit with the mounting member (16).

2. The hydraulic flow distribution module according to claim 1, wherein A first pilot chamber (14) is formed at the first end of the distribution spool valve (12). The pressure regulating unit (15) is assembled at the second end of the distribution spool valve (12) and a second pilot chamber (17) is formed. The pressure oil circuit (P) is communicated with the first pilot chamber (14), and the load sensing oil circuit (Ls) is communicated with the second pilot chamber (17).

3. A hydraulic flow distribution module according to claim 1, characterized in that, A limiting member (18) is provided at one end of the distribution spool valve (12) close to the pressure regulating unit (15). The limiting member (18) can abut against the distribution valve body (11) and the mounting member (16) to realize the axial limit of the distribution spool valve (12).

4. A hydraulic system, characterized in that, Comprising: A hydraulic pump that pumps out pressure oil to the pressure oil circuit (P); At least two actuators that work through the supply of pressure oil from the hydraulic pump, and the pressure of the actuators is fed back to the load sensing oil circuit (Ls); At least two control valves that are provided for each actuator and operate the supply of working oil from the hydraulic pump to the corresponding actuator to respectively control the actions of each actuator; A pilot oil circuit (X) and a drain oil circuit (Y) that are communicated with the two pilot chambers of the control valve; The hydraulic flow distribution module (1) according to any one of claims 1-3, and the pressure oil circuit (P), the load sensing oil circuit (Ls), the pilot oil circuit (X) and the drain oil circuit (Y) are respectively communicated with the oil channels in the hydraulic flow distribution module (1).

5. A hydraulic system according to claim 4, wherein, The pilot oil passage (X) and the drain oil passage (Y) are communicated with two pilot chambers of the control valve under the control of the solenoid valve.

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