Hydraulic system and pile machine equipment

Abstract

The utility model discloses a hydraulic system and pile machine equipment, the hydraulic system comprises a main oil way and a first branch oil way communicated with the main oil way, the first branch oil way is used for being communicated with a movable oil cylinder, the first branch oil way is provided with a hydraulic lock, two one-way sequence valves and two pilot hydraulic control oil ways, the two one-way sequence valves are arranged on the oil supply way and the oil return way respectively and located between the hydraulic lock and the movable oil cylinder. The two pilot hydraulic control oil ways are arranged in a crossed mode, and oil outlets of the pilot hydraulic control oil ways communicate with control oil inlets of the sequence valves in the one-way sequence valves. The hydraulic lock, the one-way sequence valves and the pilot hydraulic control oil ways are arranged on the first branch oil way, the hydraulic lock is used for maintaining pressure of the moving oil cylinder, the moving oil cylinder is prevented from moving accidentally under the action of external force or gravity, and meanwhile the two pilot hydraulic control oil ways are matched with the two one-way sequence valves, so that the moving oil cylinder is prevented from moving accidentally. And the oil return passage is firstly opened in the oil supply process of the movable oil cylinder, so that hydraulic impact is prevented, and the stability of the movable oil cylinder in the operation process is improved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, and in particular to a hydraulic system and a pile driver. Background Technology

[0002] Piling machines are essential mechanical equipment for foundation construction. Their main function is to drive or drill piles into the ground to improve the bearing capacity and stability of the foundation. They are widely used in various construction scenarios and integrate different functional modules according to project needs. For large-scale construction projects, piling machines not only have a large size, but also integrate multiple functional modules, such as multi-directional movement, lifting and lowering, and clamping and pressing. The control of each module may use different drive modules, making the production and use process relatively complex. Furthermore, due to the large size of the piling machine, there is a risk of swaying under the influence of combined loads during the operation of various modules, which poses a significant safety hazard.

[0003] Therefore, how to meet the needs of convenient and stable control of piling equipment is a technical 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 utility model is to provide a hydraulic system to meet the needs of convenient and stable control of piling equipment.

[0005] Another objective of this utility model is to provide a pile driver device that includes the above-mentioned hydraulic system.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A hydraulic system includes a main oil circuit and a first branch oil circuit connected to the main oil circuit. The first branch oil circuit is used to communicate with a movable oil cylinder. The first branch oil circuit is provided with a hydraulic lock, two one-way sequence valves and two pilot hydraulic control oil circuits. The two one-way sequence valves are respectively arranged on the supply and return oil circuits of the first branch oil circuit and are located between the hydraulic lock and the movable oil cylinder. The two pilot hydraulic control oil circuits are arranged crosswise on the supply and return oil circuits of the first branch oil circuit, and the oil outlet of the pilot hydraulic control oil circuit is connected to the control oil inlet of the sequence valve in the one-way sequence valve.

[0008] Preferably, in the above-mentioned hydraulic system, the main oil line is provided with an oil tank, an oil supply pump, a first valve group and a second valve group, and the first valve group and the second valve group are respectively provided with constant pressure relief valves, and the first valve group and the second valve group each include a number of directional valves arranged in parallel; each directional valve is connected to a branch oil line, and a single directional valve includes at least two working positions to switch the oil supply and return states of the corresponding branch oil line.

[0009] Preferably, in the above hydraulic system, the first valve group includes a first directional valve and a second directional valve, the downstream of the first directional valve is connected to the first branch oil circuit; the downstream of the second directional valve is provided with a second branch oil circuit, and a bidirectional quantitative hydraulic motor is provided on the second branch oil circuit to perform rotational drive action.

[0010] Preferably, in the above hydraulic system, the first directional valve is an O-type manual three-position six-way directional valve, and the second directional valve is a Y-type manual three-position six-way directional valve.

[0011] Preferably, in the above hydraulic system, the first valve group further includes a third directional valve and a fourth directional valve. A third branch oil circuit is provided downstream of the third directional valve, and a platform clamping cylinder is provided on the third branch oil circuit. A fourth branch oil circuit is provided downstream of the fourth directional valve, and a pile clamping cylinder is provided on the fourth branch oil circuit.

[0012] A set of hydraulically controlled one-way sequence valves is installed on the supply and return oil lines of the third branch oil circuit and / or the fourth branch oil circuit.

[0013] Preferably, in the above hydraulic system, the second valve group includes a fifth directional valve and a sixth directional valve. The fifth directional valve has a first branch oil circuit downstream and is connected to a pile lifting cylinder. The sixth directional valve has a third branch oil circuit downstream and is connected to a platform lifting cylinder.

[0014] Preferably, in the above hydraulic system, the set pressure of the constant pressure relief valve is 20MPa-22MPa.

[0015] Preferably, the hydraulic system further includes a pilot-operated solenoid relief valve connected to the oil supply pump, an oil supply filter and an energy accumulator installed on the main oil line, and a contamination indicator filter and a cooler installed on the return oil main line.

[0016] Preferably, in the above-described hydraulic system, the oil supply pump is a unidirectional variable displacement hydraulic pump.

[0017] A pile driver device includes a hydraulic system as described in any of the above embodiments for driving and controlling the various components.

[0018] As can be seen from the above technical solution, the hydraulic system provided by this utility model, for the first branch oil circuit set on the main oil circuit, is used to connect the movable oil cylinder, so that the movable oil cylinder acts as an actuator during the oil supply process of the first branch oil circuit. The movable oil cylinder can perform linear motion of the components on the piling machine equipment in the horizontal direction or linear motion in the vertical direction. In addition to the hydraulic locks set on its supply and return oil circuits, the first branch oil circuit is also equipped with two one-way sequence valves and two pilot hydraulic control oil circuits. The two one-way sequence valves are respectively set on the oil supply and return oil lines of the first branch oil circuit, and the one-way valves in the one-way sequence valves are... The passageway is oriented in the return direction to close the direct oil supply to the first branch oil circuit. Simultaneously, the first branch oil circuit is specially equipped with two intersecting pilot hydraulic control circuits. When supplying oil to the moving cylinder, the pilot hydraulic control circuit opens the one-way sequence valve on the return oil circuit to achieve rapid pressure relief on the return oil circuit. Simultaneously, when the return oil circuit is depressurized, a portion of the oil entering the other pilot hydraulic control circuit opens the one-way sequence valve on the supply oil circuit, causing the driving pressure of the moving cylinder to gradually increase, thus improving the stability of its driving process. This also reduces the hydraulic resistance of adjacent chambers during the oil supply process of the moving cylinder, making the driving process of the moving cylinder smoother. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the hydraulic system provided for an embodiment of this utility model;

[0021] Figure 2 for Figure 1 Detailed view of area A in the image;

[0022] Figure 3 for Figure 2 Schematic diagram of the first branch oil circuit component;

[0023] Figure 4 for Figure 1 Detailed view of area B in the image;

[0024] Figure 5 This is a schematic diagram showing the connection between the directional valve and the branch oil circuit;

[0025] Figure 6 for Figure 1 Detailed view of area C in the image.

[0026] Among them, 10-main oil circuit; 110-oil tank; 120-oil supply pump; 130-pilot-operated solenoid relief valve; 140-oil supply filter; 150-accumulator; 160-contamination indicator filter; 170-cooler; 20-first branch oil circuit; 210-moving cylinder; 220-hydraulic lock; 230-one-way sequence valve; 240-pilot hydraulic control circuit; 30-first valve group; 310-first directional valve; 320-second directional valve. Valve; 330-Third directional valve; 340-Fourth directional valve; 40-Second valve group; 410-Fifth directional valve; 4110-Pile lifting cylinder; 420-Sixth directional valve; 4210-Platform lifting cylinder; 50-Constant pressure relief valve; 610-Second branch oil circuit; 620-Bidirectional quantitative hydraulic motor; 630-Third branch oil circuit; 640-Platform clamping cylinder; 650-Fourth branch oil circuit; 660-Pile clamping cylinder. Detailed Implementation

[0027] The core of this utility model lies in disclosing a hydraulic system to meet the needs of convenient and stable control of piling equipment.

[0028] Another objective of this utility model is to provide a pile driver device that includes the above-mentioned hydraulic system.

[0029] To enable those skilled in the art to better understand the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the invention as described in the claims. Additionally, the complete contents of the configurations shown in the following embodiments are not limited to those necessary for the solution of the invention as described in the claims.

[0030] like Figure 1 and Figure 2 As shown, the hydraulic system provided in this embodiment of the present invention includes a main oil circuit 10 and multiple branch oil circuits connected to the main oil circuit 10. Taking the first branch oil circuit 20 as an example, it is connected to the main oil circuit 10 to receive the oil supply from the main oil circuit 10, and its end is connected to a movable oil cylinder 210 as an actuator. The extension and retraction of the movable oil cylinder 210 are realized by the oil supply from the main oil circuit 10, thereby realizing the linear drive of the corresponding component, such as the large ship moving mechanism of the pile driver equipment.

[0031] Specifically, the first branch oil circuit 20 is also equipped with a hydraulic lock 220, two one-way sequence valves 230, and two pilot hydraulic control oil circuits 240. The hydraulic lock 220 consists of two hydraulic control one-way valves, with the flow direction of the two valves being the return oil direction. This locks the first branch oil circuit 20 when no oil is supplied, preventing oil leakage from the two chambers of the moving cylinder 210. It also locks the position and maintains pressure of the moving cylinder 210, preventing accidental movement due to external forces or gravity, and preventing the corresponding mechanism from automatically extending or retracting, ensuring the stability and safety of the equipment corresponding to the moving cylinder 210 during operation. Simultaneously, when the first branch oil circuit 20 is supplied with oil, a portion of the hydraulic oil from the supply line enters the pilot oil circuit to open the one-way valve on the return line, enabling the moving cylinder 210 to move smoothly.

[0032] Based on this, two one-way sequence valves 230 are respectively installed on the supply and return oil lines of the first branch oil line 20, and are located between the hydraulic lock 220 and the moving oil cylinder 210. It should be noted that the sequence valve structure in the one-way sequence valve 230 is normally closed, while the conduction direction of its one-way valve structure is the return oil direction, so as to close the supply oil direction. At the same time, two pilot hydraulic control oil lines 240 are arranged crosswise on the supply and return oil lines of the first branch oil line 20. It should be noted that the oil inlets of the two pilot hydraulic control oil lines 240 are located on the supply and return oil lines of the first branch oil line 20, respectively, and the oil outlets of the two pilot hydraulic control oil lines 240 are respectively connected to the two one-way sequence valves 220. The control oil inlet of the sequence valve in valve 230; the structure of two one-way sequence valves 230 and two pilot hydraulic control oil circuits 240 can limit the oil supply to the moving cylinder 210. During the oil supply process, the sequence valve in the return oil line can be opened first to realize the rapid return oil pressure relief of the moving cylinder 210, and then the oil supply to the moving cylinder 210 can be carried out. This avoids the risk of huge pressure shock caused by the instantaneous compression of hydraulic oil, i.e., hydraulic shock, and reduces the risk of damage to the moving cylinder 210. At the same time, the one-way sequence valve 230 set on the oil supply line can also control the flow and pressure of hydraulic oil, so that the hydraulic system gradually builds up pressure and improves the stability of the movement of the moving cylinder 210.

[0033] by Figure 3For example, the first branch oil circuit 20 includes oil circuits Z1 and Z2. Oil circuit Z1 connects to the rodless chamber of the moving cylinder 210, while oil circuit Z2 connects to the rod chamber of the moving cylinder 210. Using oil circuit Z1 as the supply circuit and oil circuit Z2 as the return circuit, a one-way sequence valve 230 is installed on both oil circuits Z1 and Z2, namely, a one-way sequence valve D1 on oil circuit Z1 and a one-way sequence valve D2 on oil circuit Z2. The two ends of the pilot hydraulic control circuit X1 are connected to the control oil inlets of oil circuit Z1 and the sequence valve of one-way sequence valve D2, respectively. The two ends of the pilot hydraulic control circuit X2 are connected to the control oil inlets of oil circuit Z2 and the sequence valve of one-way sequence valve D1, respectively, thus achieving a cross-configuration of pilot hydraulic control circuits X1 and X2. Based on this, when hydraulic oil is supplied to oil circuit Z1, Z... The hydraulic locks 220 on both the Z1 and Z2 oil circuits are opened through their internal hydraulic control circuits. The one-way sequence valve D1 blocks the oil supply to the Z1 oil circuit. The oil supply in the Z1 oil circuit reaches the control oil inlet of the sequence valve of the one-way sequence valve D2 through the pilot hydraulic control circuit X1, and opens the sequence valve in the one-way sequence valve D2 to relieve the pressure in the rod chamber of the moving cylinder 210. The pressure oil in the rod chamber flows back through the one-way valve in the one-way sequence valve D2 and is also quickly unloaded through the sequence valve. At the same time, the pressure oil passing through the sequence valve in the one-way sequence valve D2 can reach the control oil inlet of the sequence valve in the one-way sequence valve D1 through the pilot hydraulic control circuit X2 to open the sequence valve in the one-way sequence valve D1, thereby supplying oil to the rodless chamber of the moving oil tank 110 and realizing the extension action of the moving oil tank 110. In the above process, during the oil supply to the rodless chamber of the movable oil tank 110 via the Z1 oil circuit, the return oil of the Z2 oil circuit is opened first due to the action of the one-way sequence valve D1 and the pilot hydraulic control oil circuit X1. This is to avoid damage to the hydraulic components or the movable cylinder 210 caused by hydraulic shock, thus forming a flow channel in the first branch oil circuit 20 first, preventing shock caused by fluid compression. At the same time, during the extension process of the movable cylinder 210, the hydraulic oil can flow back to the oil tank 110 because the rod chamber is depressurized first, thereby reducing the system pressure and making the extension process of the rodless chamber easier. This process aims to reduce energy loss and improve system operating efficiency. Furthermore, it should be noted that during the driving of the movable cylinder 210, the actions of the one-way sequence valves D1 and D2 ensure a smooth transition during hydraulic system startup. By opening the return oil passage first and then the supply oil passage, the hydraulic system can gradually build up pressure during startup. This prevents system instability caused by sudden pressure increases in large or bulky components of the piling machine, thus improving the safety of the piling machine during operation.

[0034] It should be noted that the piston rod retraction action of the movable cylinder 210, that is, the Z1 oil circuit in the first branch oil circuit 20 is the return oil circuit and the Z2 oil circuit is the supply oil circuit, is the opposite of the piston rod extension action of the movable cylinder 210 in the above embodiment. However, the cooperation method between the pilot hydraulic control oil circuit 240 and the one-way sequence valve 230 is the same, which will not be repeated here.

[0035] It should be further explained that for the execution unit on a single branch hydraulic line, such as the moving hydraulic cylinder 210 corresponding to the first branch hydraulic line 20, two or more can be connected in parallel on the first branch hydraulic line 20 to achieve drive through a single first branch hydraulic line 20. The two or more moving hydraulic cylinders 210 can serve as backups for each other, so that if a single moving hydraulic cylinder 210 unexpectedly stops, the other moving hydraulic cylinders 210 can drive the movement of the equipment. At the same time, the two or more moving hydraulic cylinders 210 can also work together to reduce the load on a single moving hydraulic cylinder 210 and improve its service life. Multiple execution units can also be connected in parallel on other branch hydraulic lines described in this article, which will not be elaborated on here.

[0036] Furthermore, for the first branch oil circuit 20 provided in the above embodiment, the function switching of oil supply and return between its Z1 oil circuit and Z2 oil circuit is achieved by a reversing valve. That is, the first branch oil circuit 20 is connected to the main oil circuit 10 through the reversing valve, so as to realize the function switching of oil supply and return between the Z1 oil circuit and Z2 oil circuit by switching the working position of the reversing valve.

[0037] Specifically, in the hydraulic system provided in this embodiment of the present invention, an oil tank 110 and an oil supply pump 120 are provided on the main oil circuit 10 to supply oil from the oil tank 110 to the main oil circuit 10 through the oil supply pump 120. At the same time, a first valve group 30 and a second valve group 40 are also provided on the main oil circuit 10. First, a constant pressure relief valve 50 is provided on the oil circuit of the first valve group 30 and the second valve group 40 respectively to control the pressure value of the area of ​​the first valve group 30 and the second valve group 40 to operate within a set range, thereby reducing the risk of damage or insufficient pressure to the oil circuit and hydraulic components in the area of ​​the first valve group 30 and the second valve group 40. Second, the first valve group 30 and the second valve group 40 respectively include a number of directional valves arranged in parallel. The first valve group 30 and the second valve group 40 are in parallel structure, and the number of directional valves included therein are also in parallel structure. In conjunction with the aforementioned embodiments, each directional valve's outlet port is connected to a branch oil circuit, such as the first branch oil circuit 20, which is connected to the main oil circuit 10 through the first directional valve 310 installed in the first valve group 30. Simultaneously, each directional valve includes at least two operating positions, which are common directional valve port adjustments, enabling the directional valve to switch the supply and return oil states of its corresponding branch oil circuit.

[0038] It should be noted that the arrangement of the first valve group 30 and the second valve group 40 not only ensures that the oil circuits in each valve group area operate within the set pressure range through the constant pressure relief valve 50, thereby improving the operational safety of the hydraulic system; at the same time, the first valve group 30 and the second valve group 40 enable the main oil circuit 10 to simultaneously regulate and control at least two branch oil circuits. The two branch oil circuits can drive two identical or different actuators, thereby hydraulically driving at least two areas in the piling machine equipment. This improves the integration of the hydraulic system and reduces the space occupied by the drive module in the piling machine equipment. The adjustment of at least two areas in the piling machine equipment can be achieved on a single panel, thus reducing the complexity of the piling machine equipment adjustment process.

[0039] Specifically, such as Figure 4 and Figure 5 As shown, in a specific embodiment of this utility model, the first valve group 30 includes a first reversing valve 310 and a second reversing valve 320. The downstream of the first reversing valve 310 is connected to the first branch oil circuit 20. The first reversing valve 310 adjusts the direction of oil supply and return in the first branch oil circuit 20 by adjusting its position, thereby realizing the extension and retraction of the movable oil cylinder 210 connected to the first branch oil circuit 20, and realizing the linear drive of the corresponding component. Downstream of the second directional valve 320, a second branch oil circuit 610 is provided. A hydraulic motor is installed on the second branch oil circuit 610. When the main oil circuit 10 supplies oil to the second branch oil circuit 610 through the second directional valve 320, the hydraulic motor performs a rotational drive action. It should be noted that the hydraulic motor installed on the second branch oil circuit 610 is a bidirectional fixed displacement hydraulic motor 620. The bidirectional fixed displacement hydraulic motor 620 can first realize the rotational drive of components on the piling machine equipment, such as winches and hoists. With the cooperation of the second directional valve 320 and the second branch oil circuit 610, it can directly achieve forward and reverse drive by switching the direction of hydraulic oil inflow and outflow, without the need for additional mechanical reversing devices, such as clutches or gearboxes. It is suitable for scenarios that require frequent reversing and simplifies the structure of the piling machine equipment. At the same time, the displacement of the bidirectional fixed displacement hydraulic motor 620 is fixed, eliminating the need for complex variable adjustment mechanisms and resulting in a simpler internal structure, reducing failure points and improving daily maintenance costs.

[0040] It should also be noted that the second branch oil circuit 610 is also equipped with a hydraulic lock structure consisting of two check valves or two one-way sequence valves to block the return oil of the second branch oil circuit 610. Only when supplying oil is the check valve or one-way sequence valve 230 on the return oil circuit is opened through the hydraulic control oil circuit to complete the pressure holding and rotation drive of the hydraulic motor.

[0041] Furthermore, in the hydraulic system provided in this utility model embodiment, the directional valves are all three-position six-way directional valves. When the three-position six-way directional valve is in the left or right position, the oil supply and return directions in the corresponding branch oil circuit change. When the three-position six-way directional valve is in the middle position, the oil supply to the corresponding branch oil circuit is cut off, and the branch pipeline can be connected to achieve unloading, reduce the power loss of the oil pump 120 when no load is applied, and extend the component life. In some embodiments of this utility model, the first directional valve 310 is an O-type manual three-position six-way directional valve. The O-type directional valve can cut off the oil passage of the actuator, i.e., the moving cylinder 210 located on the first branch oil passage 20, when in the neutral position, thereby achieving pressure holding, maintaining the stable load position of the moving cylinder 210, and improving equipment stability. Simultaneously, the manually operated directional valve can be used for position adjustment of the load components and emergency control. The second directional valve 320 is a Y-type manual three-position six-way directional valve. When in the neutral position, it allows the oil ports on both sides of the actuator, i.e., the hydraulic motor, to connect to the oil tank 110 for locking, preventing the risk of accidental movement. The directional valve can meet different needs of the actuator through different neutral position spool valve functions (such as O-type, H-type, Y-type, M-type, etc.), and can be selected according to the needs of the actuator on the corresponding branch oil passage.

[0042] Furthermore, in some embodiments of this utility model, the first valve group 30 further includes a third directional valve 330 and a fourth directional valve 340. A third branch oil circuit 630 is provided downstream of the third directional valve 330. Switching the working position of the third directional valve 330 can switch the supply and return oil directions in the third branch oil circuit 630. A platform clamping cylinder 640 is provided on the third branch oil circuit 630. The platform clamping cylinder 640 is used to drive the clamping structure in the pile driver equipment. It changes the distance between the clamping structures by extending and retracting the cylinder, thereby clamping or releasing the target equipment. A fourth branch oil circuit 650 is provided downstream of the fourth directional valve 340. A pile clamping cylinder 660 is provided on the fourth branch oil circuit 650. The pile clamping cylinder 660 is similar to the platform clamping cylinder 640, but it achieves clamping and releasing of the pile body by adjusting the working position of the fourth directional valve 340. It should also be noted that, since both the pile clamping cylinder 660 and the platform clamping cylinder 640 need to remain clamped during operation, in this embodiment, a set of hydraulically controlled one-way sequence valves are installed on the supply and return oil lines of the third branch oil line 630 and the fourth branch oil line 650. The hydraulically controlled one-way sequence valves close the return oil direction in the third branch oil line 630 and the fourth branch oil line 650, and open them through the hydraulic control pipeline when supplying oil. Both valves can achieve pressure holding and locking of the pile clamping cylinder 660 and the platform clamping cylinder 640 in the third branch oil line 630 and the fourth branch oil line 650, thereby preventing the pile clamping cylinder 660 and the platform clamping cylinder 640 from accidentally loosening during the clamping operation, which could cause equipment damage or affect personnel safety.

[0043] The second valve group 40 provided in this embodiment is the same as the first valve group 30, including several directional valves, and each directional valve connects to a single branch oil circuit to correspond to different execution units and meet the driving requirements of different parts of the piling machine equipment. Specifically, in some embodiments of this invention, the second valve group 40 includes a fifth directional valve 410 and a sixth directional valve 420 arranged in parallel. The fifth directional valve 410 has a first branch oil circuit 20 downstream and is connected to a pile lifting cylinder 4110. By switching the working position of the fifth directional valve 410, the supply and return oil status of the first branch oil circuit 20 connected to it can be adjusted. This enables the extension and retraction of the pile lifting cylinder 4110, thereby driving the lifting and lowering of the pile in the pile driving equipment. Simultaneously, with the help of the hydraulic lock 220, two one-way sequence valves 230, and two pilot hydraulic control oil circuits 240 in the first branch oil circuit 20, the pile lifting cylinder 4110 can achieve forward and reverse driving motion. At the same time, it can make the start-up of the hydraulic system corresponding to the pile lifting cylinder 4110 a smooth transition process, that is, first open the return oil passage, and then open the supply oil passage. This allows the hydraulic system to gradually build up pressure during the start-up process, avoiding the problem of abnormal operation of the pile lifting cylinder 4110 due to sudden pressure increase, and improving the safety of the pile driving equipment.

[0044] As for the sixth directional valve 420, a third branch oil circuit 630 is provided downstream of it and connected to the platform lifting cylinder 4210. As in the aforementioned embodiment, a set of hydraulically controlled one-way sequence valves 230 are provided on the supply and return oil circuits of the third branch oil circuit 630. The return oil direction in the third branch oil circuit 630 is closed by the hydraulically controlled one-way sequence valves 230, and opened by the hydraulically controlled pipeline when supplying oil. It can achieve pressure holding and locking of the platform lifting cylinder 4210, so that the platform structure driven by the platform lifting cylinder 4210 can be stably located in any working position, and achieve pressure holding to avoid the risk of accidental loosening and falling off.

[0045] Furthermore, it should be noted that multiple sets of directional valves can be provided in the first valve group 30 and the second valve group 40 to branch out more branch oil circuits, so that the hydraulic system provided by this utility model embodiment can integrate and control more components on the piling machine equipment. The corresponding branch oil circuits, as in the aforementioned embodiment, can be equipped with different valve structures to realize the action of their corresponding execution units, which will not be elaborated here.

[0046] Furthermore, in the hydraulic system provided in this embodiment of the present invention, the set pressure value of the constant pressure relief valve 50 provided on the first valve group 30 and the second valve group 40 is 20MPa-22MPa, in order to regulate the system pressure and ensure the safety of the hydraulic circuit. When the oil pressure output by the oil supply pump 120 exceeds the set requirements of the actuator, i.e., the hydraulic cylinder, motor, etc., the constant pressure relief valve 50 automatically opens to guide the excess oil back to the oil tank 110, preventing the system pressure from continuously rising. It should also be noted that in the variable pump system, the constant pressure relief valve 50 can act as a safety valve, opening only when the pressure exceeds the limit; while in the fixed displacement pump system, the constant pressure relief valve 50 continuously overflows to stabilize the pressure of the hydraulic system. When the system pressure rises suddenly due to sudden load changes or malfunctions, such as actuator jamming, the constant pressure relief valve 50 can also respond quickly to release high-pressure oil, preventing damage to pipelines, pumps, valves, and other components due to overpressure, thereby improving the safety of the hydraulic system operation.

[0047] Furthermore, such as Figure 6 As shown, in some embodiments of this utility model, the hydraulic system also includes a pilot-operated electromagnetic relief valve 130 connected to the oil supply pump 120. It combines electromagnetic control and pilot pressure regulation technology. The oil inlet of the pilot-operated electromagnetic relief valve 130 is connected to the main oil circuit 10, and the oil outlet is connected to the oil tank 110, so that the pressure relief regulation of the main oil circuit 10 can be realized through remote control, thereby realizing more flexible and efficient pressure management and regulation of the oil supply to the main oil circuit 10. The hydraulic system also includes an oil supply filter 140 and an energy accumulator 150 installed on the main oil circuit 10, and a contamination indicator filter 160 and a cooler 170 installed on the return oil main circuit. The oil supply filter 140 is used to remove contaminants from the oil, ensuring system cleanliness and preventing large particles from entering the hydraulic system, thereby ensuring the reliable operation of hydraulic components and extending system life. The energy accumulator 150 is connected to the main oil circuit 10 to maintain the stability of the hydraulic system. The energy accumulator 150 can absorb excess energy when the output pressure of the oil supply pump 120 is too high, and release energy to replenish the pressure when the pressure drops, thereby improving the operational stability of the hydraulic system. The contamination indicator filter 160 is installed on the main return oil line to detect contaminants in the hydraulic oil circulating in the return oil tank 110, so as to visually display the state of the hydraulic oil after circulation. When the contaminant concentration of the hydraulic oil exceeds the standard, the hydraulic oil needs to be replaced to ensure the safety of the hydraulic system during use. The cooler 170 is used to control and reduce the temperature of the hydraulic oil, ensuring that the hydraulic system operates within the normal temperature range, and reducing the problem of reduced viscosity and deteriorated lubrication performance of hydraulic oil due to mechanical friction, internal oil friction and external environmental factors.

[0048] Furthermore, in the hydraulic system provided in this embodiment of the present invention, the oil supply pump 120 is a unidirectional variable hydraulic pump, which is a hydraulic pump that can automatically adjust the output flow according to the changes in system load. Its output oil flow direction remains unchanged, and the supply and return oil in the branch oil circuit is adjusted by the reversing valve connected to the branch oil circuit. At the same time, the unidirectional variable hydraulic pump avoids the throttling and overflow losses common in fixed displacement pump systems, thereby significantly improving the energy utilization efficiency of the system.

[0049] Furthermore, this utility model embodiment also provides a pile driver device, which includes the hydraulic system provided in any of the above embodiments for driving and controlling the various components in the pile driver device. Since the hydraulic system has the technical effects provided in any of the above embodiments, the pile driver device also has the above technical effects, which will not be repeated here.

[0050] The terms "first," "second," "left side," and "right side," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed.

[0051] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic system characterized by, The hydraulic system comprises a main oil circuit and a first branch oil circuit communicated with the main oil circuit, the first branch oil circuit is used for communicating with a mobile cylinder, and the first branch oil circuit is provided with a hydraulic lock, two one-way sequence valves and two pilot hydraulic control oil circuits, the two one-way sequence valves are respectively arranged on the oil supply and return circuits of the first branch oil circuit and are located between the hydraulic lock and the mobile cylinder, and the two pilot hydraulic control oil circuits are arranged on the oil supply and return circuits of the first branch oil circuit in a cross manner, and the oil outlet of the pilot hydraulic control oil circuit is communicated with the control oil inlet of the sequence valve.

2. The hydraulic system of claim 1, wherein, The main oil circuit is provided with an oil tank, an oil supply pump, a first valve group and a second valve group, the first valve group and the second valve group are respectively provided with a constant pressure relief valve, the first valve group and the second valve group respectively comprise a plurality of parallelly arranged reversing valves, each reversing valve is arranged on a branch oil circuit in a communication manner, and each reversing valve comprises at least two working positions to switch the oil supply and return states of the branch oil circuit corresponding to the reversing valve.

3. The hydraulic system of claim 2, wherein, The first valve group comprises a first reversing valve and a second reversing valve, the downstream of the first reversing valve is communicated with the first branch oil circuit, and the downstream of the second reversing valve is provided with a second branch oil circuit, and the second branch oil circuit is provided with a bidirectional constant displacement hydraulic motor to perform a rotating driving action.

4. The hydraulic system of claim 3, wherein, The first reversing valve is an O-shaped manual three-position six-way reversing valve, and the second reversing valve is a Y-shaped manual three-position six-way reversing valve.

5. The hydraulic system of claim 2, wherein, The first valve group further comprises a third reversing valve and a fourth reversing valve, the downstream of the third reversing valve is provided with a third branch oil circuit, and the third branch oil circuit is provided with a platform holding cylinder, the downstream of the fourth reversing valve is provided with a fourth branch oil circuit, and the fourth branch oil circuit is provided with a pile body holding cylinder. A group of hydraulic control one-way sequence valves are arranged on the oil supply and return circuits of the third branch oil circuit and / or the fourth branch oil circuit.

6. The hydraulic system of claim 5, wherein, The second valve group comprises a fifth reversing valve and a sixth reversing valve, the downstream of the fifth reversing valve is provided with the first branch oil circuit and is connected with a pile body lifting cylinder, and the downstream of the sixth reversing valve is provided with the third branch oil circuit and is connected with a platform lifting cylinder.

7. The hydraulic system of claim 2, wherein, The set pressure of the constant pressure relief valve is 20 MPa-22 MPa.

8. The hydraulic system of claim 2, wherein, The hydraulic system further comprises a pilot type electromagnetic relief valve communicated with the oil supply pump, an oil supply filter and an energy accumulator arranged on the main oil circuit, and a pollution indicating filter and a cooler arranged on the oil return main circuit.

9. The hydraulic system of claim 2, wherein, The oil supply pump is a one-way variable hydraulic pump.

10. A pile driving apparatus, characterized by The hydraulic system is used for driving control of various components. The hydraulic system is used for driving control of various components.

Images