Hydraulic system, working arm and working machine

Abstract

The application discloses a hydraulic system, an operation arm and an engineering machine; wherein the hydraulic system comprises at least one cylinder driving assembly; the cylinder driving assembly comprises: a driving cylinder with a rodless cavity and a rod cavity; a first valve group comprising a first control valve and a first balance valve; the first control valve, the first balance valve and the rodless cavity are sequentially communicated to control the flow state of hydraulic oil in the rodless cavity; a second valve group comprising a second control valve and a second balance valve; the second control valve, the second balance valve and the rod cavity are sequentially communicated to control the flow state of hydraulic oil in the rod cavity. By selecting two valve groups, the flow state of hydraulic oil in the rodless cavity and the flow state of hydraulic oil in the rod cavity can be controlled separately, and the extension and retraction state of the piston rod of the driving cylinder is effectively controlled, which is stable, high in precision and simple in hydraulic oil circuit layout.

Description

Technical Field

[0001] This invention relates to the field of heavy equipment technology, and more specifically to a hydraulic system, a working arm having the above-described hydraulic system, and an engineering machine having the above-described working arm. Background Technology

[0002] During operation, the boom of construction machinery needs to be driven by a hydraulic system to extend, retract, and move, and reach a designated position to place materials according to operating commands. As a crucial drive mechanism for the boom, the hydraulic system boasts the unique advantage of high power density, providing efficient power to the machinery. However, construction machinery such as cranes, concrete pump trucks, and large excavators, which rely on long booms for operation, suffer from drawbacks including complex and less precise control of the oil flow in the rod and rodless chambers of the drive cylinders, and a relatively complex hydraulic circuit layout. Summary of the Invention

[0003] In view of the above, the present invention provides a hydraulic system, the present invention also provides a working arm having the above hydraulic system, and the present invention further provides an engineering machine having the above working arm.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A hydraulic system includes at least one cylinder drive assembly; the cylinder drive assembly includes:

[0006] The drive cylinder has a rodless chamber and a rod chamber;

[0007] The first valve group includes a first control valve and a first balance valve; the first control valve, the first balance valve, and the rodless chamber are connected in sequence to control the flow state of the hydraulic oil in the rodless chamber;

[0008] The second valve assembly includes a second control valve and a second balance valve; the second control valve, the second balance valve, and the rod chamber are connected in sequence to control the flow state of the hydraulic oil in the rod chamber.

[0009] Optionally, in the above hydraulic system,

[0010] The first control valve is a first proportional valve; the first proportional valve includes a first oil inlet, a first oil return, and a first working oil port; the first working oil port is connected to the rodless chamber through a first working oil circuit;

[0011] The second control valve is a second proportional valve; the second proportional valve includes a second oil inlet, a second oil return, and a second working oil port; the second working oil port is connected to the rod chamber through a second working oil circuit.

[0012] Optionally, in the above hydraulic system,

[0013] The first balance valve is located in the first working oil circuit; the control oil circuit of the first balance valve is connected to the second working oil circuit.

[0014] The second balance valve is located in the second working oil circuit; the control oil circuit of the second balance valve is connected to the first working oil circuit.

[0015] Optionally, in the above-mentioned hydraulic system, the hydraulic system further includes:

[0016] Hydraulic oil tank;

[0017] The main oil circuit is connected to the hydraulic oil tank;

[0018] The branch oil circuit is provided in multiple sets connected in parallel; each set of the branch oil circuit is connected to the main oil circuit; each set of the branch oil circuit is connected to one of the oil cylinder drive components.

[0019] Optionally, in the above hydraulic system,

[0020] The main oil circuit includes the main oil supply line and the main oil return line;

[0021] The branch oil circuit includes a branch oil supply line and a branch oil return line;

[0022] A hydraulic pump is connected to the main oil supply line; a pressure-holding valve is installed on the main oil supply line between the hydraulic pump and the branch oil supply line.

[0023] Optionally, in the above hydraulic system,

[0024] The hydraulic oil tank includes a main oil supply port and a main oil return port;

[0025] The main oil circuit includes the main oil supply line and the main oil return line;

[0026] The main oil supply pipeline includes a first oil supply end and a second oil supply end; the first oil supply end is connected to the main oil supply port.

[0027] The main return oil pipeline includes a first return oil end and a second return oil end; the first return oil end is connected to the main return oil port.

[0028] The second oil supply end and the second oil return end are connected by a connecting oil circuit; a pressure relief connecting valve is provided on the connecting oil circuit.

[0029] Optionally, in the above hydraulic system,

[0030] The hydraulic system also includes a central control station;

[0031] The hydraulic cylinder drive assembly further includes a controller, which is communicatively connected to the first valve group and the second valve group respectively; the controller of each hydraulic cylinder drive assembly is communicatively connected to the control center.

[0032] Optionally, in the above hydraulic system,

[0033] The rodless cavity is equipped with a first pressure sensor; the first pressure sensor is communicatively connected to the controller to measure the pressure of the hydraulic oil flowing through the rodless cavity;

[0034] And / or,

[0035] The rod chamber is equipped with a second pressure sensor; the second pressure sensor is communicatively connected to the controller to measure the pressure of the hydraulic oil flowing through the rod chamber;

[0036] And / or,

[0037] The drive cylinder is equipped with a displacement sensor; the displacement sensor is communicatively connected to the controller to measure the stroke and speed of the piston rod of the drive cylinder.

[0038] A working arm is equipped with a hydraulic system; the hydraulic system is the hydraulic system described above.

[0039] The working arm includes multiple articulated arm sections, and each articulated arm section is provided with a hydraulic cylinder drive assembly at its articulation point.

[0040] An engineering machine includes a working arm; the working arm is the working arm described above.

[0041] In the hydraulic system, the working arm with the above-mentioned hydraulic system, and the engineering machinery with the above-mentioned working arm provided by the present invention, by selecting two valve groups, the flow state of hydraulic oil in the rodless chamber and the flow state of hydraulic oil in the rod chamber can be controlled separately, thereby effectively controlling the extension and retraction state of the piston rod of the drive cylinder. This not only provides stable and high-precision control, but also simplifies the hydraulic circuit layout. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the hydraulic system of the present invention;

[0044] Figure 2 This is a schematic diagram of the working arm of the present invention;

[0045] Figure 3 This is a schematic diagram of the working arm of the present invention after omitting the arm section.

[0046] Figures 1-3 middle:

[0047] 1-Drive cylinder, 2-First valve group, 3-Second valve group, 4-Hydraulic oil tank, 5-Main oil circuit, 6-Branch oil circuit, 7-Pressure holding valve, 8-Pressure relief connecting valve, 9-Control center, 10-Controller, 11-Boom, 12-Vehicle body, 13-Cable;

[0048] 101 - Rodless cavity; 102 - Rod cavity;

[0049] 201 - First control valve, 202 - First balancing valve;

[0050] 301 - Second control valve, 302 - Second balancing valve;

[0051] 501 - Main oil supply line, 502 - Main oil return line;

[0052] 601 - Branch oil supply line, 602 - Branch oil return line. Detailed Implementation

[0053] The present invention provides a working arm, and also provides an engineering machine having the above-mentioned working arm.

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] like Figures 1-3 As shown, a hydraulic system includes at least one cylinder drive assembly; the cylinder drive assembly includes a drive cylinder 1, a first valve group 2, and a second valve group 3. The drive cylinder 1 has a rodless chamber 101 and a rod chamber 102; the first valve group 2 includes a first control valve 201 and a first balance valve 202; the first control valve 201, the first balance valve 202, and the rodless chamber 101 are sequentially connected to control the flow state of hydraulic oil in the rodless chamber 101; the second valve group 3 includes a second control valve 301 and a second balance valve 302; the second control valve 301, the second balance valve 302, and the rod chamber 102 are sequentially connected to control the flow state of hydraulic oil in the rod chamber 102.

[0056] It should be noted that the flow states of hydraulic oil include: ① hydraulic oil reversal adjustment: hydraulic oil flows into the rod cavity, hydraulic oil flows out of the rod cavity, or stops flowing (i.e., the working state is stopped); ② hydraulic oil flow rate adjustment; ③ hydraulic oil pressure adjustment.

[0057] By selecting two valve groups, the flow state of hydraulic oil in the rodless chamber 101 and the flow state of hydraulic oil in the rod chamber 102 can be controlled separately, thereby effectively controlling the extension and retraction of the piston rod of the drive cylinder 1. This not only provides stable and high-precision control, but also simplifies the hydraulic circuit layout.

[0058] In some embodiments of this application, the first control valve 201 is a first proportional valve; the second control valve 301 is a second proportional valve.

[0059] The first proportional valve includes a first inlet A, a first return port B, and a first working port C; the first inlet A is connected to the main supply port P of the hydraulic oil tank 4; the first return port B is connected to the main return port T of the hydraulic oil tank 4; and the first working port C is connected to the rodless chamber 101 through a first working oil circuit. The second proportional valve includes a second inlet a, a second return port b, and a second working port c; the second inlet a is connected to the main supply port P of the hydraulic oil tank 4; the second return port b is connected to the main return port T of the hydraulic oil tank 4; and the second working port c is connected to the rod chamber 102 through a second working oil circuit.

[0060] By controlling the first proportional valve, the connection between the first oil inlet A and the first working oil port C, or the connection between the first oil return port B and the first working oil port C, can be achieved.

[0061] By controlling the second proportional valve, the connection between the second oil inlet a and the second working oil port c, or the connection between the second oil return port b and the second working oil port c, can be controlled.

[0062] When the first oil inlet A is connected to the first working oil inlet C, and the second oil return port b is connected to the second working oil inlet c, the hydraulic oil in the hydraulic oil tank 4 flows sequentially through the main oil supply port P → the first oil inlet A → the first working oil inlet C → the first working oil circuit into the rodless chamber 101; the hydraulic oil in the rod chamber 102 flows sequentially through the rod chamber 102 → the second working oil circuit → the second working oil inlet c → the second oil return port b → the main oil return port T back to the hydraulic oil tank 4; at this time, the extension rod of the drive cylinder 1 extends.

[0063] When the control connects the first return port B to the first working port C, and simultaneously connects the second inlet port a to the second working port c, the hydraulic oil in the hydraulic oil tank 4 flows sequentially through the main supply port P → the second inlet port a → the second working port c → the second working oil circuit into the rod chamber 102; the hydraulic oil in the rodless chamber 101 flows sequentially through the rodless chamber 101 → the first working oil circuit → the first working port C → the first return port B → the main return port T back to the hydraulic oil tank 4; at this time, the extension rod of the drive cylinder 1 retracts.

[0064] By selecting two proportional valves, the flow state of hydraulic oil in the rodless chamber 101 and the flow state of hydraulic oil in the rod chamber 102 can be controlled separately. This not only simplifies the oil circuit setup but also increases flexibility and precision, making the oil circuit control of the hydraulic system more stable.

[0065] It should be noted that both the first and second proportional valves are three-position three-way solenoid proportional valves.

[0066] The first three-position three-way solenoid proportional valve has a first working position, a second working position, and a neutral position. When the valve is in the first working position, the first oil inlet A is connected to the first working oil port C. When the valve is in the second working position, the first oil return port B is connected to the first working oil port C.

[0067] The second three-position three-way solenoid proportional valve also has a first working position, a second working position, and a neutral position; when it is in the first working position of the second three-position three-way solenoid proportional valve, the second oil inlet a is connected to the second working oil port c; when it is in the second working position of the second three-position three-way solenoid proportional valve, the second oil return port b is connected to the second working oil port c.

[0068] A single three-position, three-way electromagnetic proportional valve can control whether hydraulic oil flows into or out of a single oil chamber. It has a simple structure, low cost, and extremely fast control response. Using two three-position, three-way electromagnetic proportional valves is the best embodiment for controlling the flow status of hydraulic oil in the rodless chamber 101 and the rod chamber 102, respectively.

[0069] In some embodiments of the present invention, a first balance valve 202 is disposed in a first working oil circuit; the control oil circuit of the first balance valve 202 is connected to a second working oil circuit; a second balance valve 302 is disposed in a second working oil circuit; and the control oil circuit of the second balance valve 302 is connected to the first working oil circuit.

[0070] When the drive cylinder 1 extends, oil enters the rodless chamber 101 and returns to the rod chamber 102. At this time, hydraulic oil flows into the rodless chamber 101 through the first working oil circuit and the first balance valve 202; the hydraulic oil is then diverted through the first working oil circuit to the control oil circuit of the second balance valve 302, at which point the second balance valve 302 opens, and the hydraulic oil in the rod chamber 102 flows out through the second working oil circuit and the second balance valve 302.

[0071] When the drive cylinder 1 retracts, oil enters the rod chamber 102 and returns to the rodless chamber 101. At this time, hydraulic oil flows into the rod chamber 102 through the second working oil circuit and the second balance valve 302; the hydraulic oil is then diverted through the second working oil circuit to the control oil circuit of the first balance valve 202, at which point the first balance valve 202 opens, and the hydraulic oil in the rodless chamber 101 flows out through the first working oil circuit and the first balance valve 202.

[0072] The first balancing valve 202 and the second balancing valve 302 have simple structures and stable flow rates, and can quickly and accurately open or close the first and second working oil circuits under different working conditions.

[0073] Please see the appendix Figure 1 , attached Figure 1 The hydraulic system diagram omits the intermediate cylinder drive assembly; in some embodiments of the present invention, the hydraulic system further includes: a hydraulic oil tank 4, a main oil circuit 5, and a branch oil circuit 6.

[0074] The main oil circuit 5 is connected to the hydraulic oil tank 4; the branch oil circuits 6 are provided with multiple sets connected in parallel; each set of branch oil circuits 6 is connected to the main oil circuit 5; each set of branch oil circuits 6 is connected to a hydraulic cylinder drive assembly.

[0075] It should be noted that the hydraulic oil tank 4 includes a main oil supply port P and a main oil return port T; the main oil circuit 5 includes a main oil supply line 501 and a main oil return line 502; and the branch oil circuit 6 includes a branch oil supply line 601 and a branch oil return line 602.

[0076] A set of branch oil lines 6 are branched out from the main oil line 5 at positions corresponding to the positions of each hydraulic cylinder drive component. Each set of branch oil lines 6 includes a first branch oil line and a second branch oil line. The first branch oil line includes a first branch oil supply line and a first branch oil return line. The second branch oil line includes a second branch oil supply line and a second branch oil return line.

[0077] The first branch oil supply line and the second branch oil supply line branch out from the main oil supply line 501 in parallel; the first branch oil return line and the second branch oil return line return to the main oil return line 502 in parallel. Specifically, the first branch oil supply line is connected to the first inlet A of the first electromagnetic proportional valve 201, and the first branch oil return line is connected to the first return port B of the first electromagnetic proportional valve 201; the second branch oil supply line is connected to the second inlet a of the second electromagnetic proportional valve 301, and the second branch oil return line is connected to the second return port b of the second electromagnetic proportional valve 301.

[0078] A main oil circuit 5 is connected from the hydraulic pump of the hydraulic oil tank 4; each drive cylinder 1 is connected in parallel to a set of branch oil circuits 6, which avoids the need for each drive cylinder 1 to lead out multiple oil circuits to the hydraulic oil tank 4, reduces the difficulty of pipeline layout, reduces maintenance costs, and also reduces the load on the boom.

[0079] In some embodiments of the present invention, a hydraulic pump is connected to the main oil supply line 501; a pressure holding valve 7 is provided on the main oil supply line 501 between the hydraulic pump and the branch oil supply line 601.

[0080] Specifically, the hydraulic pump has an oil outlet; the main oil supply line 501 has a first branch oil supply port, which is connected to the first branch oil supply line that first branches from the main oil supply line 501 in the first group of branch oil supply lines 601. A pressure holding valve 7 is installed on the main oil supply line 501; the pressure holding valve 7 is located between the oil outlet and the first branch oil supply port.

[0081] A pressure-holding valve 7 is installed on the pipeline between the oil outlet of the main oil supply line 501 and the first branch oil supply port. As such, the hydraulic oil will not backflow or leak, ensuring the high-pressure oil supply state of the main oil supply line 501 and improving the response speed of the drive cylinder.

[0082] It should be noted that the pressure holding valve 7 is a one-way valve. One-way valves are low in cost and easy and quick to install.

[0083] In some embodiments of the present invention

[0084] The main oil supply line 501 includes a first oil supply end and a second oil supply end; the first oil supply end is connected to the main oil supply port P; the second oil supply end is a free end away from the first oil supply end;

[0085] The main return oil line 502 includes a first return oil end and a second return oil end; the first return oil end is connected to the main return oil port T; the second return oil end is a free end away from the first return oil end.

[0086] The second oil supply end and the second oil return end are connected by a connecting oil circuit; a pressure relief connecting valve 8 is installed on the connecting oil circuit.

[0087] The main oil supply line 501 is a high-pressure line, and the main return line 502 is a low-pressure line. A pressure relief valve 8 is connected between the high-pressure line and the low-pressure line to relieve pressure on the high-pressure line. This prevents the hydraulic oil from impacting the high-pressure line at high pressure during reversal adjustment, reducing damage to the high-pressure line and preventing oil leakage. It also facilitates maintenance.

[0088] Because hydraulic oil solidifies and becomes highly viscous in low-temperature environments, it cannot flow smoothly in the hydraulic system. Before the hydraulic system is put into operation, the pressure relief valve 8 connecting the main oil supply line 501 and the main oil return line 502 is opened. This connects the hydraulic oil tank 4, the main oil supply line 501, the connecting oil line, and the main oil return line 502, thereby enabling rapid circulation and heating of the hydraulic oil in the hydraulic oil tank 4 and solving the problem of the boom being unable to move for a long time under extremely cold conditions.

[0089] It should be noted that the pressure relief valve 8 is a two-position two-way solenoid directional valve. The two-position two-way solenoid directional valve includes a first working position and a second working position; when it is in the first working position, the main oil supply line 501 and the main oil return line 502 are connected; when it is in the second working position, the main oil supply line 501 and the main oil return line 502 are disconnected; the two-position two-way solenoid directional valve can quickly and accurately adjust the connection or disconnection state between the main oil supply line 501 and the main oil return line 502.

[0090] In some embodiments of this application, the hydraulic system further includes a control station 9;

[0091] The hydraulic cylinder drive assembly also includes a controller 10, which is communicatively connected to the first proportional valve, the second proportional valve, and the pressure relief valve 8, respectively; the controller 10 of each hydraulic cylinder drive assembly is communicatively connected to the control station 9.

[0092] The controller 10 within each cylinder drive assembly can quickly, accurately, and reliably control the flow of hydraulic oil in the rodless chamber 101 and rod chamber 102 of the drive cylinder 1 within the cylinder drive assembly. The controller 10 can also quickly and accurately adjust the connection or disconnection between the main oil supply line 501 and the main oil return line 502.

[0093] The control station 9, serving as the drive command station for driving the movements of each boom segment 11, is mounted on the vehicle body 12 of the construction machinery. The control station 9 is connected to the controllers 10 of each hydraulic system and has the functions of communication, data exchange, and status parameter monitoring with each controller 10.

[0094] Furthermore, the controllers 10 of each hydraulic system are connected to the control station 9 of the vehicle body 12 via wiring harness cables 13. The control station 9 exchanges data and monitors status parameters with each controller 10 arranged in parallel via communication cables. The communication cables have a large transmission capacity, and the signals do not interfere with each other. They also have strong resistance to external interference. At the same time, the communication cables are very stable during information transmission.

[0095] In some embodiments of the present invention, a first pressure sensor is provided in the rodless chamber 101 of the drive cylinder 1. The first pressure sensor is communicatively connected to the controller 10 to measure the pressure of the hydraulic oil flowing through the rodless chamber 101. A second pressure sensor is provided in the rod chamber 102 of the drive cylinder 1. The second pressure sensor is communicatively connected to the controller 10 to measure the pressure of the hydraulic oil flowing through the rod chamber 102. A displacement sensor is provided on the drive cylinder 1. The displacement sensor is communicatively connected to the controller 10 to measure the stroke and speed of the extension rod of the drive cylinder.

[0096] It should be noted that the controller 10 uses an intelligent algorithm to control the switching logic, frequency, and flow rate of the control valve group 3, thereby realizing the pressure-flow composite motion of the hydraulic oil in the driving cylinder 1. A first pressure sensor and a second pressure sensor are installed in the rodless chamber 101 and the rod chamber 102, respectively, to provide feedback on the pressure of the hydraulic oil in the rodless chamber 101 and the rod chamber 102, and to transmit the above signals to the controller 10, providing the intelligent algorithm with hydraulic oil pressure state parameters; the above setup enables real-time monitoring and dynamic control of the pressure state of the hydraulic oil in the rodless chamber 101 and the rod chamber 102.

[0097] The displacement sensor measures the displacement of the telescopic rod of the drive cylinder 1, thereby obtaining the travel distance of the telescopic rod. Then, based on the displacement, the extension and retraction speed of the telescopic rod is calculated using differentiation. Finally, the flow rate of the hydraulic oil in the drive cylinder 1 is calculated based on the cylinder body area of ​​the drive cylinder 1. The displacement sensors installed on the drive cylinder 1 are used to provide feedback on the travel distance, speed, and flow rate of the telescopic rod, and transmit these signals to the controller 10, providing state parameters for the intelligent algorithm. This setup enables real-time monitoring and dynamic control of the telescopic rod's travel distance, speed, and the flow rate of the hydraulic oil in the drive cylinder 1.

[0098] Furthermore, the displacement sensor can be replaced with a position sensor. The type of sensor that can achieve the above functions can be selected according to the actual situation, offering great flexibility and applicability.

[0099] It should be noted that the first valve group 2 and the second valve group 3 are both integrated on the cylinder body of the drive cylinder 1; the controller 10 is integrated on any one of the cylinder body, the first valve group 2 and the second valve group 3.

[0100] Specifically, the valve seat of the first valve group 2, the valve seat of the second valve group 3, and the cylinder body of the drive cylinder 1 form an integrated cylinder body, which is manufactured by means of, but not limited to, casting, additive manufacturing, mechanical assembly, etc.

[0101] The integrated first valve group 2, second valve group 3, and controller 10 completely replace the function of the traditional multi-way control valve. Compared with connecting the multi-way control valve in the hydraulic circuit, its structure is more compact; it eliminates the pipeline between the cylinder and valve, which largely offsets the extra load of the hydraulic valve group on the working arm; it solves the problem of slow action response speed of the drive cylinder due to the long pipeline between the drive cylinder and the control valve group; while simplifying the structure of the hydraulic system of the working arm, this invention greatly improves the control response of the working arm in emergency situations, shortens the operation delay during normal operation, and provides timely control response when safety faults occur in high-load and high-inertia working environments, greatly avoiding the occurrence of safety accidents and improving the efficiency and safety of the working arm operation.

[0102] Furthermore, the hydraulic system can be replaced with an electro-hydraulic actuator (EHA). An electro-hydraulic actuator integrates various hydraulic components, including a motor, a two-way pump, a specially designed valve assembly, a tank, and cylinders. It provides powerful and reliable linear or rotary motion power to drive the extension, retraction, and movement of each boom segment; it offers advantages such as high power density, light weight, low noise, and small size.

[0103] A working arm is provided with a hydraulic system, which is the hydraulic system described above; the working arm includes a plurality of articulated arm sections 11, and each arm section 11 is provided with a hydraulic cylinder drive assembly at its articulation point.

[0104] like Figure 2 As shown, the boom comprises multiple interconnected boom sections, each designated as the first boom section, second boom section, third boom section, and so on. One end of the first boom section is hinged to the rotary table, and the other end is hinged to the second boom section. The end of the second boom section furthest from the first boom section is hinged to the third boom section. The end of the third boom section furthest from the second boom section is hinged to the fourth boom section; and so on.

[0105] A first hydraulic cylinder drive assembly is provided at the hinge joint between the rotary table and the first boom section to drive the first boom section; a second hydraulic cylinder drive assembly is provided at the hinge joint between the first boom section and the second boom section to drive the second boom section; a third hydraulic cylinder drive assembly is provided at the hinge joint between the second boom section and the third boom section to drive the third boom section; a fourth hydraulic cylinder drive assembly is provided at the hinge joint between the third boom section and the fourth boom section to drive the fourth boom section; ...

[0106] The first hydraulic cylinder drive assembly, the second hydraulic cylinder drive assembly, the third hydraulic cylinder drive assembly, the fourth hydraulic cylinder drive assembly, and so on are arranged in a distributed manner to form the distributed hydraulic system of the working arm.

[0107] The layout of the distributed hydraulic system is more organized and clear, reducing the difficulty of hydraulic system layout, reducing maintenance costs, and making it easier to achieve flexible and precise control of each boom section.

[0108] An engineering machine includes a working arm; the working arm is the working arm described above.

[0109] It should be noted that construction machinery can refer to cranes, concrete pump trucks, large excavators, and other construction machinery that rely on the extension of a long boom to operate.

[0110] Since the construction machinery includes the aforementioned boom, please refer to the above content for the beneficial effects brought by the boom, which will not be repeated here.

[0111] The components and devices involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the drawings. As those skilled in the art will recognize, these components and devices can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0112] It should also be noted that in the device of the present invention, the components can be disassembled and / or reassembled. These disassemblies and / or reassemblies should be considered as equivalent solutions of the present invention.

[0113] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0114] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

[0115] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications or equivalent substitutions made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic system, characterized in that, It includes at least one hydraulic cylinder drive assembly, one-to-one branch hydraulic circuits connected to the hydraulic cylinder drive assembly, and main hydraulic circuits respectively connected to the branch hydraulic circuits; the hydraulic cylinder drive assembly includes: The drive cylinder has a rodless chamber and a rod chamber; The first valve group includes a first control valve and a first balance valve; the first control valve, the first balance valve, and the rodless chamber are connected in sequence to control the flow state of the hydraulic oil in the rodless chamber; The second valve assembly includes a second control valve and a second balance valve; the second control valve, the second balance valve, and the rod chamber are connected in sequence to control the flow state of the hydraulic oil in the rod chamber; Wherein: the main oil circuit includes a main oil supply pipeline and a main oil return pipeline, and a pressure relief valve is connected between the main oil supply pipeline and the main oil return pipeline; The valve seat of the first valve group, the valve seat of the second valve group, and the cylinder body of the drive cylinder form an integrated cylinder body.

2. The hydraulic system according to claim 1, characterized in that, The first control valve is a first proportional valve; the first proportional valve includes a first oil inlet, a first oil return, and a first working oil port; the first working oil port is connected to the rodless chamber through a first working oil circuit; The second control valve is a second proportional valve; the second proportional valve includes a second oil inlet, a second oil return, and a second working oil port; the second working oil port is connected to the rod chamber through a second working oil circuit.

3. The hydraulic system according to claim 2, characterized in that, The first balance valve is located in the first working oil circuit; the control oil circuit of the first balance valve is connected to the second working oil circuit. The second balance valve is located in the second working oil circuit; the control oil circuit of the second balance valve is connected to the first working oil circuit.

4. The hydraulic system according to any one of claims 1-3, characterized in that, The hydraulic system also includes a hydraulic oil tank; the main oil circuit is connected to the hydraulic oil tank.

5. The hydraulic system according to claim 4, characterized in that, The branch oil circuit includes a branch oil supply line and a branch oil return line; A hydraulic pump is connected to the main oil supply line; a pressure-holding valve is installed on the main oil supply line between the hydraulic pump and the branch oil supply line.

6. The hydraulic system according to claim 4, characterized in that, The hydraulic oil tank includes a main oil supply port and a main oil return port; The main oil supply pipeline includes a first oil supply end and a second oil supply end; the first oil supply end is connected to the main oil supply port. The main return oil pipeline includes a first return oil end and a second return oil end; the first return oil end is connected to the main return oil port. The second oil supply end and the second oil return end are connected by a connecting oil circuit; a pressure relief connecting valve is provided on the connecting oil circuit.

7. The hydraulic system according to any one of claims 1-3, characterized in that, The hydraulic system also includes a central control station; The hydraulic cylinder drive assembly further includes a controller, which is communicatively connected to the first valve group and the second valve group respectively; the controller of each hydraulic cylinder drive assembly is communicatively connected to the control center.

8. The hydraulic system according to any one of claims 1-3, characterized in that, The rodless cavity is equipped with a first pressure sensor; the first pressure sensor is communicatively connected to the controller to measure the pressure of the hydraulic oil flowing through the rodless cavity; And / or, The rod chamber is equipped with a second pressure sensor; the second pressure sensor is communicatively connected to the controller to measure the pressure of the hydraulic oil flowing through the rod chamber; And / or, The drive cylinder is equipped with a displacement sensor; the displacement sensor is communicatively connected to the controller to measure the stroke and speed of the piston rod of the drive cylinder.

9. A working arm equipped with a hydraulic system, characterized in that, The hydraulic system is the hydraulic system according to any one of claims 1-8; The working arm includes multiple articulated arm sections, and each articulated arm section is provided with a hydraulic cylinder drive assembly at its articulation point.

10. An engineering machine, comprising a working arm, characterized in that, The working arm is the working arm as described in claim 9.

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