Hammer hydraulic transmission and control system and large hydraulic pile hammer

Abstract

The utility model belongs to offshore wind power construction equipment technical field, specifically disclose a hammer hydraulic transmission and control system and large -scale hydraulic pile hammer, hydraulic pile hammer adopts two three -way reversing slide valve + gas -liquid double -acting hydraulic cylinder's novel hydraulic transmission and control action principle design, adopts a group of two three -way reversing slide valve assembly to replace two groups of two -way cartridge valve in the prior art, need not time -sequential control, improve the switching speed of control valve, slow down cavitation phenomenon, save the switch time of test monitoring control valve, improve the precision and versatility of control, utilize the compressibility of gas -liquid double -acting oil cylinder nitrogen cavity accumulates energy simultaneously, improve the striking ability, can be used for super -large specification hydraulic pile hammer, have the advantages such as big, high frequency, control simple, reliability etc. of beating energy, reduce production time, improve production efficiency, and the hydraulic pile hammer passes through annular integrated valve group, and the degree of integration is high, reduces external connecting pipeline, and better copes with flow field, vibration, stress and other severe working conditions.

Description

Technical Field

[0001] This utility model belongs to the technical field of offshore wind power construction equipment, specifically disclosing a hydraulic transmission and control system for a hammer body and a large hydraulic pile hammer. Background Technology

[0002] With the increasing global demand for renewable energy, offshore wind power, as a clean and renewable energy source, has received widespread attention. In large-scale offshore wind power construction, hydraulic pile hammers are indispensable equipment. Their main function is to drive wind turbine piles into the seabed to a certain depth for fixation. However, existing hydraulic pile hammer transmission and control systems suffer from problems such as low impact capacity, complex control, low efficiency, and poor stability, limiting their application in offshore wind power construction. Therefore, developing a large, efficient, and reliable hydraulic transmission system for large hydraulic pile hammers used in offshore wind power has significant practical importance and market demand.

[0003] The hydraulic transmission and control principle of the traditional large hydraulic pile hammer is as follows: three sets of two-way cartridge valves (inlet valve P, return valve R, and replenishing valve S) are used to control the up-and-down movement of the gas-hydraulic double-acting hydraulic cylinder and the hammer core. At the same time, the electromagnetically controlled two-way cartridge valve is a two-stage pilot control. The pilot-operated electromagnetic directional valve controls the opening and closing of the main stage large-diameter two-way cartridge valve. The control of the inlet valve P and the return valve R is a time-sequence control. The precise coordination of the control time sequence of the two valves is required to achieve accurate control of the movement of the hammer hydraulic cylinder. Because the actual opening and closing time of the cartridge control valve is uncertain under different actual working conditions, it is necessary to test the opening and closing time of the control valve under different pressures in the laboratory. Then, the control program is programmed based on the opening and closing time obtained from the test. The implementation path is long, and the manufacturing of the control valve is also relatively difficult.

[0004] Meanwhile, the hydraulic system based on this control principle will produce cavitation. The cause of cavitation is that when the closing and opening times of the valves overlap, if the closing time of valve P is short during the hammer core lifting process, there is a brief closing time before valve R opens. At this time, the hammer core continues to move upward due to inertia, but insufficient oil supply can generate suction and negative pressure, causing gas in the oil to be released and causing cavitation. Although the replenishing valve S can replenish some oil, the replenishing valve has a delayed response and slow opening, and cannot completely eliminate cavitation. Cavitation is the main reason for the shortened life of control valves, high failure rate, and poor system stability.

[0005] In addition, in terms of structural design, the inlet and outlet ports and flanges of traditional hydraulic pile hammers are located at the top of the hammer body. They need to be connected to the central annular valve group through internal pipes, which results in long channels, many potential leakage risks, and difficult maintenance. Summary of the Invention

[0006] To address the problems in the background technology, this utility model discloses a hydraulic transmission and control system for a hammer body. It adopts a novel hydraulic transmission and control principle using a two-position three-way reversing slide valve and a pneumatic-hydraulic double-acting hydraulic cylinder. It can be used for ultra-large hydraulic pile hammers and has the advantages of high striking energy, high frequency, simple control, and high reliability, thereby reducing production time and improving production efficiency.

[0007] Meanwhile, this utility model also discloses a large hydraulic pile hammer, including an annular integrated valve group, which has high integration and complete functions, reduces external connection pipelines, reduces pipeline leakage risks, and can better cope with harsh working conditions such as flow field, vibration, and stress.

[0008] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0009] A hydraulic transmission and control system for a hammer includes a main oil circuit and a pilot control circuit, wherein,

[0010] The main oil circuit includes a main-stage two-position three-way directional valve. The high-pressure inlet (P port) of the main-stage two-position three-way directional valve is connected to the high-pressure oil pipe of the ground power station via an inlet pipe and inlet assembly. A high-pressure accumulator and a high-pressure sensor are connected near the inlet assembly on the inlet pipe. The working chamber inlet (A port) of the main-stage two-position three-way directional valve is connected to the rod chamber of the hydraulic cylinder via a pipeline. The rodless chamber of the hydraulic cylinder is connected to a sealed nitrogen chamber. The cylinder rod is connected to the hammer core of the piling hammer. A cavitation accumulator and a hammer core pressure sensor are connected to the pipeline between the working chamber oil port A and the rod chamber of the hydraulic cylinder; the low-pressure return oil port T of the main stage two-position three-way directional valve is connected to the return oil pipe of the ground power station through the return oil pipeline and the return oil port assembly; a low-pressure accumulator and a low-pressure pressure sensor are connected to the return oil pipeline near the return oil port assembly; a safety valve assembly is connected between the inlet oil pipeline and the return oil pipeline, and the safety valve assembly is used to open the overflow when the pressure difference between the high-pressure inlet oil port P and the low-pressure return oil port T exceeds the pressure.

[0011] The pilot control circuit includes a two-position three-way directional valve assembly, which includes a pilot solenoid directional valve. The inlet of the pilot solenoid directional valve is connected to the main oil circuit inlet pipe through a branch inlet pipe. A pilot filter and a pilot accumulator are connected to the branch inlet pipe. The return port of the pilot solenoid directional valve is connected to the main oil circuit return pipe through a branch return pipe. The working port of the pilot solenoid directional valve is connected to the pilot cylinder to control the direction of movement of the pilot cylinder. The cylinder body of the pilot cylinder is mechanically connected to the valve core of the main-stage two-position three-way directional valve to push the valve core of the main-stage two-position three-way directional valve to switch directions.

[0012] Furthermore, in the hammer hydraulic transmission and control system, a high-pressure accumulator is used to store high-pressure hydraulic oil in the inlet pipe and stabilize the pressure, and a high-pressure sensor is used to monitor the pressure in the inlet pipe.

[0013] Furthermore, in the hammer hydraulic transmission and control system, the low-pressure accumulator is used to absorb the instantaneous large flow of hydraulic oil during the hammer core's descent and subsequently release it to the return oil pipeline, and to replenish oil to the hammer core's oil chamber during the hammer core's impact and rebound process, so as to balance the pressure fluctuations in the hydraulic system. The low-pressure sensor is used to monitor the pressure in the return oil pipeline.

[0014] Furthermore, in the hammer body hydraulic transmission and control system, the anti-cavitation accumulator is used to replenish oil when the main stage two-position three-way reversing spool valve is insufficient during the hammer core rising stage, thereby preventing negative pressure and cavitation phenomena in the hydraulic system.

[0015] Furthermore, in the hammer hydraulic transmission and control system, a pilot filter is used to filter the incoming oil and protect the pilot solenoid directional valve; a pilot accumulator is used to store the pilot control oil pressure to ensure response speed; and a hammer core pressure sensor is used to monitor the pressure in the rod chamber of the hydraulic cylinder.

[0016] A large hydraulic pile driver includes the hydraulic transmission and control system for the hammer body as described in any of the preceding claims.

[0017] Furthermore, the large hydraulic pile hammer has an annular integrated valve assembly in the middle of the pile hammer. The annular integrated valve assembly is a cylindrical structure. A shaft hole for the hydraulic cylinder rod to pass through is provided in the middle of the annular integrated valve assembly. A hydraulic cylinder piston assembly is provided between the shaft hole and the hydraulic cylinder rod. The outer circular surface of the annular integrated valve assembly is provided with mounting holes for an oil inlet flange assembly, a two-position three-way reversing spool valve assembly, a return oil flange assembly, and an anti-cavitation accumulator. The upper end face of the annular integrated valve assembly is provided with four sets of high-pressure accumulator mounting holes and two sets of low-pressure accumulator mounting holes circumferentially.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This utility model relates to a hydraulic transmission and control system for a hammer body. The hydraulic pile hammer adopts a novel hydraulic transmission and control principle design based on a two-position three-way reversing spool valve and a pneumatic-hydraulic double-acting hydraulic cylinder. This is the first of its kind in the industry. It is designed to solve the control problem of large flow, large inertia, high pressure, and high frequency hydraulic systems under conditions of greater impact power and higher impact frequency. The reversing control valve adopts a set of two-position three-way reversing spool valve components to replace the two sets of two-way cartridge valves in the existing technology. This eliminates the need for timing control, improves the switching speed of the control valve, reduces cavitation, and saves the testing and monitoring of the control valve's opening and closing time, thereby improving the accuracy and versatility of the control. At the same time, it utilizes the compressibility of the nitrogen chamber of the pneumatic-hydraulic double-acting cylinder to accumulate energy, thereby improving the impact power. The use of an anti-cavitation accumulator eliminates the original oil replenishment valve, allowing for direct and rapid oil replenishment, which can avoid the occurrence of cavitation. This effectively prevents negative pressure and cavitation in the system, protects hydraulic components, and extends the service life and stability of the system.

[0020] This utility model of a large hydraulic pile hammer adopts an integrated annular valve assembly that integrates a two-position three-way reversing spool valve control unit, an inlet flange assembly, a return flange assembly, an anti-cavitation accumulator, and four sets of high-pressure accumulators and two sets of low-pressure accumulator mounting holes. The components are connected as shown in the schematic diagram through an internal channel, allowing the hydraulic oil to be transmitted and controlled internally. The inlet and return hoses connecting to the ground power station enter and exit from the middle, unlike the installation method where the oil enters and exits from the top cover. This eliminates the need for internal pipelines to be connected downwards, reducing the risk of pipeline leakage. The annular integrated valve assembly is installed in the middle of the hammer body, with high integration and complete functions, reducing the number of external connection pipelines and better coping with harsh working conditions such as flow fields, vibrations, and stresses. Attached Figure Description

[0021] Figure 1 This is a hydraulic schematic diagram of the hydraulic transmission and control system for the hammer body of this utility model;

[0022] Figure 2 This is a schematic diagram of the hammer body in this utility model;

[0023] Figure 3 These are schematic diagrams of the three-dimensional structure, cross-sectional structure and side view of the annular integrated valve assembly of this utility model: (a) three-dimensional view; (b) cross-sectional view; (c) side view;

[0024] Figure 4 This is a cross-sectional view of the two-position three-way reversing slide valve assembly in this utility model;

[0025] Figure 5 This is a top view of the two-position three-way reversing slide valve assembly of this utility model;

[0026] In the above diagram: 1-Pile hammer body; 2-Pile hammer core; 3-Two-position three-way directional valve assembly; 4-Anti-cavitation accumulator; 5-Low-pressure accumulator; 6-High-pressure accumulator; 7-Safety valve assembly; 8-Return port assembly; 9-Inlet port assembly; 10-High-pressure sensor; 11-Low-pressure sensor; 12-Hammer core pressure sensor; 13-Main stage two-position three-way directional valve; 13.1-Directional valve cover plate; 13.2-Valve sleeve; 13.3-Valve core; 14-Pilot cylinder; 15-Pilot solenoid directional valve; 16-Pilot accumulator; 17-Pilot filter; 18-Hydraulic cylinder body; 19-Hydraulic cylinder rod; 20-Hydraulic cylinder piston assembly; 21-Annular integrated valve group. Detailed Implementation

[0027] To better understand this utility model, the following embodiments further illustrate the content of this utility model, but the content of this utility model is not limited to the following embodiments.

[0028] Combined with appendix Figure 1-5This invention provides a detailed description of a hydraulic transmission and control system for a hammer, comprising a main oil circuit and a pilot control circuit, wherein...

[0029] The main oil circuit includes a main stage two-position three-way directional valve 13. The high-pressure inlet P of the main stage two-position three-way directional valve 13 is connected to the high-pressure oil pipe of the ground power station via an inlet pipe and an inlet assembly 9. A high-pressure accumulator 6 and a high-pressure sensor 10 are connected near the inlet assembly 9 on the inlet pipe. The working chamber inlet A of the main stage two-position three-way directional valve 13 is connected to the rod chamber of the hydraulic cylinder inside the housing of the pile hammer 1 via a pipeline. The rodless chamber of the hydraulic cylinder is connected to a sealed nitrogen chamber. The cylinder rod 19 is connected to the pile hammer core 2. An anti-cavitation accumulator 4 and a core pressure sensor 12 are connected on the pipeline between the working chamber inlet A of the main stage two-position three-way directional valve 13 and the rod chamber of the hydraulic cylinder. The low-pressure return port T of the main stage two-position three-way directional valve 13 is connected via a return pipe and a return assembly. 8 is connected to the return oil pipe of the ground power station. A low-pressure accumulator 5 and a low-pressure pressure sensor 11 are connected near the return oil port assembly 8 on the return oil pipe. A safety valve assembly 7 is connected between the inlet oil pipe and the return oil pipe. The safety valve assembly 7 is used to open the overflow when the pressure difference between the high-pressure inlet P port and the low-pressure return oil port T port exceeds the limit, providing overpressure safety protection and overflow function for the high-pressure oil circuit, preventing system overpressure and limiting the maximum system pressure. The safety valve assembly 7 includes a two-way cartridge valve, a pilot relief valve, and a pilot-stage solenoid directional valve. When the pilot-stage solenoid directional valve is not energized, the safety valve assembly is in the closed state. When the pilot-stage solenoid directional valve is energized, the safety valve assembly is in the unloaded state for maintenance or other emergency operations. The safety valve assembly 7 is existing technology, so the specific structure of the safety valve assembly 7 will not be described in detail.

[0030] The pilot control circuit includes a two-position three-way directional valve assembly 3, which serves as the main control directional element. This assembly controls the inlet and outlet directions of the pneumatic-hydraulic double-acting hydraulic cylinder, enabling the pile hammer to lower and raise. The assembly includes a pilot solenoid directional valve 15, whose inlet is connected to the main oil inlet via a branch inlet pipe. A pilot filter 17 and a pilot accumulator 16 are connected to the branch inlet pipe. The outlet of the pilot solenoid directional valve 15 is connected to the main oil inlet via a branch return pipe. The working port of the pilot solenoid directional valve 15 is connected to the pilot cylinder 14 to control its direction of movement. The main stage two-position three-way directional valve 13 includes a valve sleeve 13. 13.2 and valve core 13.3. Valve core 13.3 is a hollow structure, through which hydraulic oil flows. One end of valve sleeve 13.2 is fixedly connected to directional valve cover plate 13.1 by screws. Pilot solenoid directional valve 15 is fixedly connected to directional valve cover plate 13.1. The cylinder body of pilot cylinder 14 is mechanically connected to valve core 13.3 to push valve core 13.3 to switch. The main stage two-position three-way directional valve 13 is driven by pilot cylinder 14 with independent control. It has short switching time and fast action. Pilot solenoid directional valve 15 controls the movement of pilot cylinder 14, which in turn drives the valve core 13.3 of the main stage two-position three-way directional valve 13 to move, thereby controlling the movement direction of the pile hammer core. This directional valve has the advantages of large oil flow capacity, rapid switching, simple structure and high reliability.

[0031] In this utility model, the two-position three-way reversing spool valve assembly of the hammer body hydraulic transmission and control system adopts a large flow and high frequency response two-position three-way reversing spool valve integrated control unit. The main stage two-position three-way reversing spool valve has a large diameter, short full-stroke response time of the main valve core, large oil flow capacity, and fast response. The valve core of the main stage two-position three-way reversing spool valve has a hollow structure, and the hydraulic oil flows through the hollow part of the valve core, which is different from the solid valve core structure of conventional small reversing spool valves. The valve core of the main stage two-position three-way reversing spool valve is driven by an independently controlled pilot cylinder, which has a short reversing time and fast action. This reversing valve has the advantages of simple structure, rapid switching, and high reliability. It can be used for ultra-large specification hydraulic pile hammers and has the advantages of large striking energy, high frequency, simple control, and high reliability.

[0032] The hydraulic cylinder inside the housing of the pile driver hammer 1 is a pneumatic-hydraulic double-acting hydraulic cylinder, which is the core actuator of the hydraulic transmission system. The rodless chamber of the hydraulic cylinder stores gas (nitrogen or compressed air) at a certain pressure, while the rod chamber is circulated with hydraulic oil and connected to the main stage two-position three-way reversing spool valve 13 and the anti-cavitation accumulator 4. The cylinder rod and the hammer core of the pile driver are an integral structure, and the hammer core is a large mass block. By controlling the movement of the cylinder rod and the hammer core, the kinetic energy of the hammer core is converted into striking energy and applied to the anvil and wind turbine pile cylinder below. During the hammer core lifting stage, the hydraulic energy in the rod chamber compresses the gas in the rodless chamber and drives the hammer core to lift. During the hammer core descent and impact stage, under the pressure of the gas expansion in the rodless chamber and the action of gravity, the hammer core descends rapidly and generates kinetic energy. The pneumatic-hydraulic double-acting hydraulic cylinder achieves rapid and efficient impact of the pile driver hammer through the combined action of gas compression and expansion and liquid pressure. Its structural design allows the hammer core to make full use of the compressibility of gas and the incompressibility of liquid during the impact process, thereby improving energy utilization efficiency.

[0033] As an optional design, the preferred hydraulic transmission and control system for the hammer body includes a high-pressure accumulator 6 for storing high-pressure hydraulic oil and energy output from the high-pressure oil pipe of the ground power station through the inlet pipe, and stabilizing the pressure. During the hammer core falling phase, it stores the oil at the outlet of the inlet pipe and releases the oil to the rod chamber of the hydraulic cylinder during the hammer core lifting phase. This is to meet the instantaneous high-pressure and high-flow demand generated by the pile hammer during the lifting phase, as well as to absorb the pressure shock during the switching process, ensuring the stable operation of the pile hammer. The high-pressure sensor 10 is used to monitor the pressure of the inlet pipe.

[0034] As an optional design, the preferred hydraulic transmission and control system for the hammer body includes a low-pressure accumulator 5 for absorbing the instantaneous large flow of hydraulic oil during the hammer core's descent and subsequently releasing it to the return oil pipeline, and for replenishing oil to the hammer core's oil chamber during the hammer core's impact and rebound process to balance pressure fluctuations in the hydraulic system. The low-pressure sensor 11 is used to monitor the pressure in the return oil pipeline.

[0035] As an optional design, the preferred hydraulic transmission and control system for the hammer body includes an anti-cavitation accumulator 4, which is used to replenish oil to the rod chamber of the hydraulic cylinder inside the hammer body 1 housing when the main stage two-position three-way reversing valve 13 is insufficient during the hammer core rising stage. This prevents negative pressure and cavitation in the hydraulic system and protects the hydraulic components from damage.

[0036] As an optional design, the preferred hammer hydraulic transmission and control system includes a pilot filter 17 for filtering the incoming oil and protecting the pilot solenoid directional valve 15, a pilot accumulator 16 for storing pilot control oil pressure to ensure response speed, and a hammer core pressure sensor 12 for monitoring the pressure in the rod chamber of the hydraulic cylinder.

[0037] A large hydraulic pile driver includes the hydraulic transmission and control system for the hammer body as described in any of the preceding claims.

[0038] As an optional design, the large hydraulic pile hammer preferably has an annular integrated valve assembly 21 in the middle of the pile hammer. This provides installation space and interfaces for the main stage two-position three-way reversing spool valve 13, high-pressure accumulator 6, low-pressure accumulator 5, and anti-negative pressure accumulator 4, as well as providing support and guidance for the hydraulic cylinder hammer core. The annular integrated valve assembly 21 has a cylindrical structure. The hydraulic cylinder body 18 is located in the rear end housing of the pile hammer body 1. A shaft hole for the hydraulic cylinder rod 19 to pass through is provided in the middle of the annular integrated valve assembly 21. A hydraulic cylinder piston assembly 20 is provided between the shaft hole and the hydraulic cylinder rod 19. The outer surface of the annular integrated valve assembly 21 is provided with mounting holes for the oil inlet flange assembly, the two-position three-way reversing spool valve assembly 3, the return flange assembly, and anti-cavitation accumulator. The mounting holes for the device 4 are arranged circumferentially on the upper surface of the annular integrated valve group 21. There are four sets of high-pressure accumulator mounting holes 6 and two sets of low-pressure accumulator mounting holes. The configuration of four sets of high-pressure accumulators and two sets of low-pressure accumulators is adopted. The volume of each accumulator is large, and the accumulator groups are evenly distributed in a ring. The annular integrated valve group is installed in the middle of the hammer body. It has a high degree of integration and complete functions, reduces external connection pipelines, and better copes with harsh working conditions such as flow field, vibration, and stress. The anti-cavitation accumulator is embedded in the annular valve group. The accumulator cylinder is integrated with the valve body of the annular valve group. The oil supply outlet is connected to the rod chamber of the hydraulic cylinder. The oil inlet and return hoses connecting to the ground power station enter and exit from the middle, which is different from the installation method of oil inlet and return from the top cover. There is no need for internal pipelines to be connected downwards, reducing the risk of pipeline leakage.

[0039] The working process of this utility model is as follows:

[0040] After assembling all the components of the large hydraulic pile hammer of this utility model, fill the nitrogen chamber of the rodless chamber of the hydraulic cylinder with nitrogen to the rated pressure. In the two-position three-way reversing slide valve control unit, fill the pilot accumulator 16 with nitrogen or compressed air to the rated pressure. In the annular integrated valve group 21, fill the anti-cavitation accumulator 4 with nitrogen to the rated pressure. Fill the high-pressure accumulator 6 with nitrogen to the rated pressure. Fill the low-pressure accumulator 5 with nitrogen to the rated pressure. Set the overflow pressure of the safety valve assembly 7 to the rated pressure.

[0041] Connect the oil inlet assembly 9 of the annular integrated valve group to the high-pressure oil pipe outlet of the ground power station through four hydraulic hose assemblies, and connect the oil return assembly 8 to the oil return port of the ground power station through four hydraulic hose assemblies; at the same time, connect the electrical components on the hammer body to the ground control system through control cables; and place the pile hammer body on the anvil and replacement ring on the upper part of the offshore wind turbine pile, and the preliminary preparations are complete.

[0042] The initial state is as follows: the initial position of the pile hammer core 2 is at the lower zero position of the hydraulic cylinder; the pilot solenoid directional valve 15 is not energized; the initial position of the valve core 13.3 of the main stage two-position three-way directional valve 13 is at the lowermost closed position of the valve sleeve 13.2; the high-pressure oil inlet P port of the main stage two-position three-way directional valve 13 is closed, cutting off the high-pressure oil input to the hammer core oil chamber; the A port and T port of the main stage two-position three-way directional valve 13 are connected; the hammer core oil chamber is connected to the low-pressure return oil pipe; the nitrogen in the rodless chamber is in a low-pressure state; the pilot solenoid directional valve of the safety valve assembly is not energized; the safety valve assembly 7 is in a closed state. It should be noted that the rod chamber of the hydraulic cylinder inside the housing of the pile hammer body 1 is connected to the oil circuit; the hydraulic cylinder rod 19 is connected to the pile hammer core 2; the rod chamber of the hydraulic cylinder inside the housing of the pile hammer body 1 is also called the hammer core oil chamber.

[0043] Hammer core lifting stage: The ground power station pumps high-pressure hydraulic oil sequentially through the inlet hose assembly and the hammer body inlet flange into the high-pressure oil passage of the hammer body, and fills the high-pressure accumulator 6 and pilot accumulator 16 to the system pressure; when the ground control system issues a command to energize the pilot solenoid directional valve 15, the control oil circuit pushes the pilot cylinder 14 upward through the pilot filter 17 and the pilot solenoid directional valve 15, driving the valve core 13.3 of the main stage two-position three-way directional valve 13. Moving from the closed position to the open position, the high-pressure oil inlet P port of the main stage two-position three-way reversing valve 13 is connected to the A port, and the low-pressure oil return port T port of the main stage two-position three-way reversing valve 13 is closed to the oil return pipeline, cutting off the oil return channel. The high-pressure oil from the ground power station pump oil source and the high-pressure accumulator 6 enters the hammer core oil chamber through the high-pressure oil inlet pipeline and the main stage two-position three-way reversing valve 13 in sequence. The hydraulic system pushes the pile hammer core 2 to rise rapidly from the lowest zero position, converting the hydraulic energy into the position potential energy of the pile hammer core 2. At the same time, the nitrogen in the rodless chamber nitrogen chamber is compressed, the nitrogen pressure increases, and pressure energy is accumulated (which will be used to push the pile hammer core 2 to fall faster). The anti-cavitation accumulator 4 is filled with oil. When the hydraulic system pushes the pile hammer core 2 to rise rapidly, if the oil supply in the hammer core oil chamber is insufficient, the anti-cavitation accumulator 4 will immediately replenish the oil in the hammer core oil chamber to avoid negative pressure suction.

[0044] Hammer core descent and impact phase: During the rapid ascent of the pile driving hammer core 2, the height signal of the pile driving hammer core 2 is monitored. When the pile driving hammer core 2 reaches the height corresponding to the impact energy, the ground control system issues a command to de-energize the pilot solenoid directional valve 15 and the valve core 13.3 of the main stage two-position three-way directional valve 13. Under the action of the return spring, the valve core moves from the open position to the closed position, and the high-pressure oil inlet P port of the main stage two-position three-way reversing slide valve 13 is closed, cutting off the high-pressure oil supply. At the same time, the low-pressure oil return port T port of the main stage two-position three-way reversing slide valve 13 is connected to port A. The oil in the hammer core oil chamber is discharged into the return oil circuit through the main stage two-position three-way reversing slide valve 13. During this process, the pile hammer core 2 gradually stops rising. The anti-cavitation accumulator 4 replenishes some oil to the hammer core oil chamber to ensure that the oil inlet channel of the main stage two-position three-way reversing slide valve 13 is closed and the pile hammer core 2 rises by inertia without generating negative pressure and cavitation. When the pile hammer core gradually rises to the highest point and the speed is zero, under the action of the pressure of the nitrogen chamber in the rodless chamber and the gravity of the pile hammer core 2, the pile hammer core 2 begins to fall at high speed, converting the gravitational potential energy and nitrogen chamber pressure energy of the pile hammer core 2 into the kinetic energy of the pile hammer core 2. When the pile hammer core 2 descends to its lowest point, it strikes the anvil and the wind turbine pile, transferring the energy of the pile hammer core to the wind turbine pile, causing the wind turbine pile to descend to a certain depth into the seabed foundation. During the descent of the pile hammer core 2, the oil in the rod chamber of the hydraulic cylinder enters the low-pressure return oil pipeline and the low-pressure accumulator 5 through the main stage two-position three-way reversing valve 13. When the descent speed is high, a portion of the instantaneous large flow of oil generated enters the low-pressure accumulator 5 for storage and is slowly released. It then enters the return oil system of the ground power station through the return oil hose assembly and enters the oil tank. After a certain period of time, the hammer core stabilizes at the lowest position, and the oil return and release from the rod chamber of the hammer core and the low-pressure accumulator 5 are completed. At the same time, the high-pressure accumulator 6 is in the oil filling process during this process. When the ground control system issues a command to energize the pilot solenoid reversing valve 15, the hammer core enters the next lifting process and completes the above process, thus repeating the cycle.

[0045] The above description is only an application implementation of this utility model, but the protection scope of this utility model is not limited thereto and cannot be used to limit the scope of rights of this utility model. Any equivalent changes made according to the technical solution of this utility model should be included within the protection scope of this utility model.

Claims

1. A hydraulic drive and control system for a hammer body, characterized by: Includes the main oil circuit and pilot control circuit, among which, The main oil circuit includes a main-stage two-position three-way directional valve. The high-pressure inlet (P port) of the main-stage two-position three-way directional valve is connected to the high-pressure oil pipe of the ground power station via an inlet pipe and inlet assembly. A high-pressure accumulator and a high-pressure sensor are connected near the inlet assembly on the inlet pipe. The working chamber inlet (A port) of the main-stage two-position three-way directional valve is connected to the rod chamber of the hydraulic cylinder via a pipeline. The rodless chamber of the hydraulic cylinder is connected to a sealed nitrogen chamber. The cylinder rod is connected to the hammer core of the piling hammer. A cavitation accumulator and a hammer core pressure sensor are connected to the pipeline between the working chamber oil port A and the rod chamber of the hydraulic cylinder; the low-pressure return oil port T of the main stage two-position three-way directional valve is connected to the return oil pipe of the ground power station through the return oil pipeline and the return oil port assembly; a low-pressure accumulator and a low-pressure pressure sensor are connected to the return oil pipeline near the return oil port assembly; a safety valve assembly is connected between the inlet oil pipeline and the return oil pipeline, and the safety valve assembly is used to open the overflow when the pressure difference between the high-pressure inlet oil port P and the low-pressure return oil port T exceeds the pressure. The pilot control circuit includes a two-position three-way directional valve assembly, which includes a pilot solenoid directional valve. The inlet of the pilot solenoid directional valve is connected to the main oil circuit inlet pipe through a branch inlet pipe. A pilot filter and a pilot accumulator are connected to the branch inlet pipe. The return port of the pilot solenoid directional valve is connected to the main oil circuit return pipe through a branch return pipe. The working port of the pilot solenoid directional valve is connected to the pilot cylinder to control the direction of movement of the pilot cylinder. The cylinder body of the pilot cylinder is mechanically connected to the valve core of the main-stage two-position three-way directional valve to push the valve core of the main-stage two-position three-way directional valve to switch directions.

2. The hydraulic drive and control system for a hammer body according to claim 1, characterized in that: The high-pressure accumulator is used to store high-pressure hydraulic oil in the inlet pipeline and stabilize the pressure, while the high-pressure pressure sensor is used to monitor the pressure in the inlet pipeline.

3. The hydraulic drive and control system for a hammer body as set forth in claim 1, wherein: The low-pressure accumulator is used to absorb the instantaneous large flow of hydraulic oil during the fall of the hammer core and then release it to the return oil pipeline, and to replenish the oil in the hammer core oil chamber during the hammer core's impact and rebound process, so as to balance the pressure fluctuations in the hydraulic system. The low-pressure pressure sensor is used to monitor the pressure in the return oil pipeline.

4. The hydraulic drive and control system for a hammer body as set forth in claim 1, wherein: The anti-cavitation accumulator is used to replenish oil when the main stage two-position three-way directional valve is insufficient during the hammer core rising stage, preventing negative pressure and cavitation in the hydraulic system.

5. The hydraulic drive and control system for a hammer body of claim 1 wherein: The pilot filter is used to filter the incoming oil and protect the pilot solenoid directional valve. The pilot accumulator is used to store the pilot control oil pressure to ensure response speed. The hammer pressure sensor is used to monitor the pressure in the rod chamber of the hydraulic cylinder.

6. A large hydraulic pile hammer characterized by: Includes the hydraulic transmission and control system for the hammer as described in any of the preceding items.

7. The large hydraulic ram hammer according to claim 6, characterized in that: A ring-shaped integrated valve assembly is installed in the middle of the pile hammer. The ring-shaped integrated valve assembly is a cylindrical structure. A shaft hole for the hydraulic cylinder rod to pass through is provided in the middle of the ring-shaped integrated valve assembly. A hydraulic cylinder piston assembly is installed between the shaft hole and the hydraulic cylinder rod. The outer circular surface of the ring-shaped integrated valve assembly is provided with mounting holes for oil inlet flange assembly, two-position three-way reversing slide valve assembly, oil return flange assembly, and anti-cavitation accumulator. The upper end face of the ring-shaped integrated valve assembly is provided with four sets of high-pressure accumulator mounting holes and two sets of low-pressure accumulator mounting holes circumferentially.

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