Hydraulic system of marine single-arm oil press

Abstract

The invention discloses a marine single-arm oil press hydraulic system which comprises a hydraulic station oil tank used for storing hydraulic oil and provided with an oil pump motor set and a control valve block. An oil pump inlet of the oil pump motor set is connected with the oil tank through a pipeline, and an oil pump outlet of the oil pump motor set is connected with the control valve set; an inlet and an outlet of the control valve group are respectively connected with an outlet of the main oil pump and an upper cavity interface and a lower cavity interface of the oil cylinder; the main oil cylinder is used for executing the up-and-down action of a pressure head of the oil press and is arranged in the steel structure rack of the single-arm oil press; the liquid filling pool is used for quickly supplementing and absorbing oil in a rodless cavity of the main oil cylinder, is mounted on an upper platform of the rack of the oil press, and is connected with the main oil cylinder through a liquid filling valve and a pipeline; and the oil cooling device is used for cooling hydraulic oil of the hydraulic system. The system is simple in structure, complete in function, convenient to maintain and high in system stability, and key components of the oil pump motor set and the control valve are designed in a standardized mode.

Description

Technical Field

[0001] This invention relates to the field of hydraulic systems for hydraulic presses, specifically a hydraulic system for a marine single-arm hydraulic press. Background Technology

[0002] Shipyard hull processing workshops are primarily responsible for processing the outer hull plating, and single-arm hydraulic presses are crucial cold-working equipment for this purpose. The characteristics of plate processing using marine single-arm hydraulic presses are numerous specifications, small batches, and the processing of irregularly shaped plates, which is particularly challenging. Operators need to use different templates and, in manual mode, use general-purpose molds to cold-press out hull sections of plating with different shapes and specifications. Simultaneously, the hydraulic press needs to be stable, reliable, and have few malfunctions, requiring simple maintenance to minimize downtime. To adapt to these working conditions, single-arm hydraulic presses need to be easy to operate, have stable performance, and provide rapid and reliable response. Therefore, a suitable hydraulic system for marine single-arm hydraulic presses is urgently needed. Summary of the Invention

[0003] In view of this, the present invention provides a hydraulic system for a single-arm marine hydraulic press to improve the operational performance and system stability of the single-arm hydraulic press in the hull plate processing of shipyards.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A hydraulic system for a marine single-arm hydraulic press includes: a hydraulic station tank for storing hydraulic oil, wherein the outlet of the hydraulic station tank is connected to an oil pump motor unit via a pipeline; An oil pump motor unit for providing hydraulic power, wherein the main oil pump inlet and outlet of the oil pump motor unit are respectively connected to the hydraulic station oil tank and the control valve group; A control valve assembly for controlling the movement of the hydraulic cylinder, wherein control valves are integrated on the control valve assembly and connected to the hydraulic pump and the hydraulic cylinder via pipelines; The main hydraulic cylinder is used to perform the upward and downward movement of the press head of the single-arm hydraulic press. The main hydraulic cylinder is installed in the steel structure frame of the hydraulic press. The working press head is installed at the end of the piston rod of the main hydraulic cylinder. The filling valve is installed on the top of the main hydraulic cylinder. The filling valve is connected to the filling tank through a pipeline. A filling tank for quickly replenishing and absorbing oil in the rodless chamber of the main cylinder, wherein the filling tank is connected to the main cylinder and the hydraulic station oil tank via pipelines; An oil cooling device for controlling the oil temperature of a hydraulic system, wherein the oil cooling device is installed on one side of the oil tank of the hydraulic station. The oil pump motor assembly and control valve assembly are both mounted on the hydraulic station oil tank.

[0005] Furthermore, the hydraulic station oil tank is placed on one side of the hydraulic press and is internally divided into an oil storage chamber and an oil return chamber. The oil outlet of the oil storage chamber is connected to the main oil pump through a pipeline. A first manual butterfly valve and a first flexible connector are installed on the oil outlet pipeline. The oil port of the oil return chamber is connected to the oil return pipeline through a second flexible connector. The top cover and side wall of the oil return chamber are equipped with an oil return filter, a second air filter, a liquid level relay, a temperature measuring thermocouple, a liquid level thermometer, and a second flexible connector.

[0006] Furthermore, the oil pump motor unit includes: a main oil pump, an electric motor, and a coupling. The main oil pump and the electric motor are connected via the coupling and are installed on one side of the base of the hydraulic station oil tank. The electric motor drives the main oil pump to provide pressure to the hydraulic system. The inlet of the main oil pump is connected to the hydraulic station oil tank via a first manual butterfly valve and a flexible joint. The outlet of the main oil pump is connected to the control valve group via a pipeline. The manual butterfly valve is used to control the opening and closing of the pipeline, and the flexible joint is used to prevent pipeline vibration.

[0007] Furthermore, the control valve assembly is installed on the upper cover plate of the hydraulic station oil tank. The inlet of the control valve assembly is connected to the outlet of the main oil pump via a high-pressure hose. The control valve assembly includes an oil manifold and hydraulic valves. The oil manifold has internal flow channels for controlling the opening and closing of the hydraulic valves. The oil manifold includes an oil pump inlet P and four outlets. Outlet A is connected to the rodless chamber of the main oil cylinder, outlet B is connected to the rod chamber of the main oil cylinder, outlet K is connected to the control port of the filling valve, and outlet T is connected to the return oil filter. The hydraulic valves include a solenoid relief valve, a first check valve, an electro-hydraulic directional valve, a second check valve, a two-way cartridge valve, a solenoid ball valve, a third check valve, a back pressure valve, a hydraulically controlled check valve, a first solenoid directional valve, a second solenoid directional valve, a high-pressure relay, a low-pressure relay, a first pressure test connector, a second pressure test connector, a first pressure gauge, and a second pressure gauge.

[0008] Furthermore, the main cylinder is a piston cylinder type. The oil ports of the rod chamber and rodless chamber of the main cylinder are connected to the corresponding interfaces of the control valve group through pipelines. The filling valve is installed at the top of the rodless chamber of the main cylinder. The inlet and outlet of the filling valve are connected to the filling pool through flanges and pipelines. The control oil port of the filling valve is connected to the corresponding interface of the control valve group through pipelines.

[0009] Furthermore, the filling tank is placed on the upper platform of the steel structure frame of the hydraulic press. The interior of the filling tank is divided into an oil storage chamber and an oil draining chamber by a partition. The oil storage chamber is connected to the filling valve through a pipeline and a second manual butterfly valve. The oil draining chamber is connected to the hydraulic station oil tank through a pipeline.

[0010] Furthermore, the oil cooling device operates independently of the hydraulic main circuit, and the oil cooling device is connected to the hydraulic station oil tank via a hose.

[0011] Furthermore, the electromagnetic relief valve has high-pressure pilot control and low-pressure pilot control, which are used to control the start-up and unloading of the main oil pump during the downward and return strokes of the hydraulic press, respectively.

[0012] Furthermore, the two-way cartridge valve, in conjunction with the pilot-controlled solenoid ball valve, is used to control the rapid downward movement of the main hydraulic cylinder.

[0013] Furthermore, the back pressure valve, the first check valve, the second check valve, and the third check valve function as sequence valves, respectively used to control the slow downward movement and rapid return of the rod chamber of the main cylinder. The electro-hydraulic directional valve is controlled by internal control and internal leakage, and is used to control the downward and return movements of the main circuit of the hydraulic system. The second solenoid directional valve is used to control the opening of the filling valve when the cylinder returns rapidly.

[0014] The beneficial effects of this invention are as follows: 1. The system of this invention has a reasonable layout, compact structure, small footprint, convenient installation and maintenance, and reliable and stable operation. It adopts a modular installation method, with the oil pump motor unit and control valve assembly integrated on the hydraulic station tank. The hydraulic station and main cylinder are connected by a combination of rigid pipes and flexible hoses, allowing for different layout schemes to be made according to different situations. This facilitates quick disassembly and installation while also reducing vibration in the pipeline.

[0015] 2. The control valve assembly of this invention is designed as a relatively independent functional module according to the operating conditions of a marine single-arm hydraulic press. It adopts a combination of traditional slide valves and two-way logic cartridge valves. The principle is simple and easy to understand, and operation and maintenance are convenient. The various functions do not interfere with each other, making daily maintenance relatively convenient. After training, maintenance technicians can use simple logic to determine the fault type, use logical deduction and other methods to find the cause, and restore the equipment to operation. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a hydraulic schematic diagram of the present invention; Figure 2 This is a front view of the hydraulic station of the present invention; Figure 3 This is a top view of the hydraulic station of the present invention; Figure 4 This is an example diagram illustrating the arrangement of the present invention; Figure 5 This is a structural diagram of the main hydraulic cylinder of the present invention; Figure 6 This invention relates to an electromagnet action table for a hydraulic system.

[0018] In the diagram: 1-Hydraulic station oil tank; 2-First manual butterfly valve; 3-First flexible joint; 4-Main oil pump; 5-Control valve assembly; 6-Solenoid relief valve; 7-First check valve; 8-Electro-hydraulic directional valve; 9-Second check valve; 10-Two-way cartridge valve; 11-Solenoid ball valve; 12-Third check valve; 13-Back pressure valve; 14-Hydraulic control check valve; 15-First solenoid directional valve; 16-Second solenoid directional valve; 17-High pressure relay; 18-Low pressure relay; 20-Charging... 21-Second manual butterfly valve; 22-Filling tank; 23-First air filter; 24-Return oil filter; 25-Level relay; 26-Second air filter; 27-Thermocouple; 28-Level thermometer; 29-Second flexible connector; 30-Oil cooling device; 31-Main cylinder; 32-First pressure test connector; 33-Second pressure test connector; 34-First pressure gauge; 35-Second pressure gauge; 36-Motor; 37-Coupling; 38-Limit switch. Detailed Implementation

[0019] 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.

[0020] Please see the appendix Figure 1-6 This invention provides a hydraulic system for a marine single-arm hydraulic press, comprising: a hydraulic station tank 1 for storing hydraulic oil, internally divided into an oil storage chamber and an oil return chamber, with its outlet connected to the main oil pump 4 of the oil pump motor unit via a pipeline; an oil pump motor unit for providing hydraulic power, consisting of the main oil pump 4, an electric motor 36, and a coupling 37, with its oil pump inlet and outlet connected to the hydraulic station tank 1 and a control valve assembly 5, respectively; and a control valve assembly 5 for controlling the movement of the main oil cylinder 31, which integrates most of the control valve components and is connected to the main oil pump via a pipeline. 4 is connected to the main oil cylinder 31; the main oil cylinder 31, used to perform the upward and return movements of the press head, is installed inside the steel frame of the press and connected to the control valve group 5 through pipelines; the filling pool 22, used to quickly replenish and absorb the oil in the rodless chamber of the main oil cylinder 31, is connected to the main oil cylinder 31 and the hydraulic station oil tank 1 through pipelines respectively; the oil cooling device 30, used to control the oil temperature of the hydraulic system, is installed next to the hydraulic station oil tank 1; the motor oil pump group and control valve group 5, composed of the main oil pump 4 and the motor 36, are installed on the hydraulic station oil tank 1.

[0021] This invention optimizes the hydraulic system design based on the actual operating conditions of single-arm hydraulic presses in shipyards. The system features a simple structure, complete functions, and standardized design for key components such as the main oil pump 4 and control valve group 5. This results in low cost, convenient maintenance, and high system stability. A separate slow-down button is provided on the control panel for fine-tuning operations when the marine hydraulic press is pressing segmented outer plates.

[0022] The hydraulic station oil tank 1 of this invention is placed next to the hydraulic press and is internally divided into an oil storage chamber and an oil return chamber. The oil outlet of the oil storage chamber is connected to the main oil pump 4 via a pipeline. A first manual butterfly valve 2 and a first flexible connector 3 are installed on the oil outlet pipeline. The oil outlet of the oil return chamber is connected to the oil return pipeline via a second flexible connector 29. The top cover and side walls of the oil return chamber of the hydraulic station oil tank 1 are equipped with hydraulic accessories such as an oil return filter 24, a second air filter 26, a level relay 25, a temperature measuring thermocouple 36, a level thermometer 28, and a second flexible connector 29, which, as part of the hydraulic system, ensure the normal operation of the system. The hydraulic station oil tank 1 is equipped with an oil pump motor unit, a control valve group 5, and an oil cooling device 30. Lifting lugs are designed on the two side walls of the hydraulic station oil tank 1 for easy lifting and transportation.

[0023] The oil pump motor unit of this invention mainly consists of a main oil pump 4, an electric motor 36, and a coupling 37, etc., and is installed on one side of the base of the hydraulic station oil tank 1 to provide hydraulic power to the hydraulic system. The suction port of the main oil pump 4 is connected to the hydraulic oil tank 1 through a first manual butterfly valve 2, a first flexible connector 3, and pipelines. The outlet of the main oil pump 4 is connected to the control valve group 5 through pipelines. The main oil pump 4 is a domestically produced mature high-pressure plunger pump with constant power control, which can automatically adjust the output flow according to the system pressure to achieve the purpose of energy saving and consumption reduction.

[0024] like Figures 2-3 As shown, the control valve assembly 5 of this invention is installed on the upper cover plate of the hydraulic station oil tank 1. It consists of a custom-designed and machined control oil circuit block and various functional control valves. The inlet of the control valve assembly 5 is connected to the outlet of the main oil pump 4, and the three oil outlets are respectively connected to the upper and lower chamber interfaces of the main oil cylinder 31 and the control port of the filling valve 20. The hydraulic valves are installed on the valve block and include: a first check valve 7, an electromagnetic relief valve 6, an electro-hydraulic directional valve 8, a second check valve 9, a two-way cartridge valve 10, an electromagnetic ball valve 11, a third check valve 12, a back pressure valve 13, a hydraulically controlled check valve 14, a first electromagnetic directional valve 15, a low-pressure relay 18 and a high-pressure relay 17, a second electromagnetic directional valve 16, a first pressure test connector 32 and a second pressure test connector 33, and a first pressure gauge 34 and a second pressure gauge 35. The control valve assembly 5 connects the internal control oil circuit by machining channels inside the oil circuit block. It is small in size, compact in structure, and simple and beautiful. The first check valve 7 is used at the system outlet to prevent hydraulic oil from flowing back and damaging the oil pump. The second check valve 9 is installed at the inlet of the rodless chamber of the main cylinder 31 to achieve the one-way pressure holding function.

[0025] like Figures 4-5 As shown, the main hydraulic cylinder 31 of this invention is installed inside the frame of a single-arm hydraulic press. The main hydraulic cylinder 31 is a piston cylinder type, and the rod-side and rodless sides of the main hydraulic cylinder 31 are respectively connected to the corresponding interfaces of the control valve group 5. A pressure head is installed at the end of the piston rod of the main hydraulic cylinder 31, and a filling valve 20 is designed at the top of the main hydraulic cylinder 31. The filling valve 20 is connected to the filling tank 22 through a pipeline. The main hydraulic cylinder 31 is designed in a standardized manner according to the design parameters of the single-arm hydraulic press, and the seals used comply with national and industry standards. The limit switch 38 serves as a safety device to limit the stroke of the main hydraulic cylinder 31.

[0026] The filling tank 22 of this invention is installed on the upper part of the steel structure frame of the hydraulic press. The filling tank 22 is divided into an oil storage chamber and an oil drain chamber by a partition. The oil storage chamber is connected to the filling valve 20 through a pipeline and a second manual butterfly valve 21. It is used to store the large amount of oil that flows out instantaneously from the rodless chamber of the main cylinder 31 during the rapid return of the cylinder, and also to replenish the oil required by the rodless chamber when the main cylinder 31 descends rapidly. The oil drain chamber is directly connected to the hydraulic station oil tank. When the oil in the storage chamber overflows the partition, the oil can quickly flow back to the hydraulic station oil tank 1 through the oil drain chamber. The filling tank 22 is also equipped with a first air filter for purifying the gas.

[0027] The filling valve 20 of this invention is installed on the top of the main oil cylinder 31. It has a pipeline structure and can be installed and connected outside the hydraulic station oil tank 1. It is connected to the filling pool 22 through the flange port to realize the replenishment and storage of oil in the rodless chamber of the main oil cylinder 31.

[0028] The oil cooling device 30 of this invention is used to control the temperature of hydraulic oil in a hydraulic system. The device includes a motor, oil pump, filter, and heat exchanger. The oil cooling device 30 draws high-temperature hydraulic oil from the hydraulic station oil tank 1, filters and cools it, and then discharges it back into the hydraulic station oil tank 1. Based on the temperature detected by the thermocouple, the oil cooling device 30 automatically turns on and off via a temperature controller to maintain the hydraulic system oil temperature within the normal operating range. The thermocouple 27 can be used in conjunction with the oil cooling device 30. When the press control system detects that the thermocouple reading exceeds the set value, the oil cooling device 30 will automatically activate to cool the system in automatic mode.

[0029] The hydraulic system of the marine single-arm hydraulic press of the present invention can be divided into three functional parts: rapid descent, slow descent, and unloading and rapid return. Each function is controlled separately and does not interfere with each other, which can make the system stable and efficient. Its working principle is described as follows: like Figure 6The diagram shows the electromagnet action table for the hydraulic system of a marine single-arm hydraulic press. When the system is in its original position, after the motor 36 drives the high-pressure oil pump 4 to start working, because the pilot control port of the electromagnetic relief valve 6 is connected to the hydraulic station oil tank 1, the pressure at the control port is close to zero, and the valve core of the electromagnetic relief valve 6 is in the open state. The oil output from the main oil pump 4 flows back to the hydraulic station oil tank 1 through the electromagnetic relief valve 6. At this time, the hydraulic system is in an unloaded state.

[0030] When the electromagnet YV4 of the pilot control solenoid ball valve 11 of the two-way cartridge valve 10 is energized, the control port of the main valve core of the two-way cartridge valve 10 is connected to the hydraulic station oil tank 1. The valve core of the two-way cartridge valve 10 opens under the action of pressure difference. At this time, the rod chamber of the main cylinder 31 is connected to the hydraulic station oil tank 1. The piston rod and pressure head of the main cylinder 31 begin to descend rapidly by their own weight. The descending speed can be adjusted by the throttling adjustment rod of the two-way cartridge valve 10. After the pressure head descends, a certain negative pressure will be generated in the rodless chamber of the main cylinder 31, which will draw open the main valve core of the filling valve 20. The oil in the filling pool 22 enters the rodless chamber of the hydraulic station oil tank 1 in large quantities, and the pressure head achieves rapid downward movement.

[0031] When electromagnet YV4 is de-energized, the rapid descent of the pressure head stops. However, when electromagnets YV1 (pilot control solenoid valve of solenoid relief valve 6) and YV3 (electrohydraulic directional valve 8) are energized, the main oil pump 4 starts pressurizing. Pressurized oil passes through the first check valve 7, the electrohydraulic directional valve 8, and the second check valve 9, entering the rodless chamber of the main oil cylinder 31 to create pressure. This pressure pushes the valve core of the filling valve 20 to close. Simultaneously, the oil in the rod chamber of the hydraulic station oil tank 1 overflows over the set pressure of the back pressure valve 13, thus achieving a slow descent of the pressure head in the hydraulic station oil tank 1. After the pressure head contacts the workpiece, the pressure in the rodless chamber rapidly rises to the set pressure. Even if pressurization stops, the pressure in the rodless chamber of the hydraulic station oil tank 1 remains essentially constant due to the one-way pressure-holding effect of the first check valve 7 and the second check valve 9.

[0032] Before the pressure head returns, the pressure in the rodless chamber of the main cylinder 31 is very high. Instantaneous release would cause significant hydraulic shock and vibration to the main cylinder 31 and its pipelines. To avoid this, the high pressure in the rodless chamber must be pre-released through a small-diameter control valve before the pressure head rises to ensure reliability and safety. Upon return command, if the detected pressure of the low-pressure relay 18 connected to the rodless chamber circuit is less than its set pressure, the solenoid YV7 of the solenoid relief valve 6, the solenoid YV3 of the electro-hydraulic directional valve 8, and the solenoid YV6 of the second solenoid directional valve 16 (which controls the opening of the filling valve 20) are energized. Oil enters the rod chamber of the main cylinder 31, the filling valve 20 opens, and the pressure head returns quickly. If the detected pressure of the low-pressure relay 18 is greater than its set pressure, the YV7 solenoid of the electromagnetic overflow valve 6 and the YV5 solenoid of the first electromagnetic directional valve 15 are energized, controlling the oil circuit to open the hydraulic check valve 14. The oil pressure in the rodless chamber of the main cylinder 31 is quickly released through the hydraulic check valve 14. The pressure gauge 35 connected in the rodless chamber circuit can observe the real-time change value of the cylinder pressure. Until the pressure in the rodless chamber is lower than the set value of the pressure relay 18, the YV6 solenoid of the second electromagnetic directional valve 16 is activated, the filling valve 20 is opened, the YV2 solenoid of the electro-hydraulic directional valve 8 is activated, opening the return main oil circuit. The oil enters the rod chamber of the main cylinder 31 through the third check valve 12, and the pressure head rises rapidly. The oil in the rodless chamber of the main cylinder 31 then quickly returns to the filling pool 22 through the filling valve 20, thereby realizing the rapid return of the pressure head of the main cylinder 31. The single-arm hydraulic press completes one working cycle.

[0033] The set pressure value of the low-pressure relay 18 depends on the specific working conditions, and should be such that it does not produce obvious vibration, generally around 1-2 MPa.

[0034] After the oil level in the filling tank 22 reaches the height of the internal partition, it flows into the drain chamber and then quickly flows back to the hydraulic station oil tank 1 through the pipeline.

[0035] Since the system pressure required for the return stroke of the main cylinder 31 is relatively low, in order to protect the filling valve 20 and pipelines and extend their service life, the low-pressure pilot section of the electromagnetic relief valve 6 is used in the return stroke. This results in lower system pressure, less vibration in the hydraulic circuit, and improved stability and reliability of the hydraulic system.

[0036] The above describes the working principle of a hydraulic system for a marine single-arm hydraulic press.

[0037] In one application embodiment, the hydraulic system of a 350-ton single-arm hydraulic press in a shipyard's hull processing workshop was modified, solving the long-standing problems of inconvenient operation, difficult maintenance, and significant impact vibration and leakage in the system pipelines. After using this invention, the hydraulic press is more flexible and convenient to operate, greatly improving the efficiency of outer plate processing. The system pipelines experience less vibration and leakage, maintenance is simple and efficient, and replacement of spare parts is inexpensive. In particular, it meets the processing requirements for special-shaped plates, achieving the modification objective.

[0038] In summary, the marine single-arm hydraulic press system of the present invention has a simple structure, small footprint, convenient installation, stable and reliable system operation, and relatively independent functional parts of each system that do not interfere with each other. It uses all domestically produced pumps, valves and hydraulic components, resulting in low cost and simple maintenance. The system has been optimized specifically for shipyard outer plate processing, meeting the special requirements of marine single-arm hydraulic presses for outer plate processing.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions are also within the scope of protection of the present invention.

Claims

1. A hydraulic system for a marine single-arm hydraulic press, characterized in that, include: A hydraulic station oil tank (1) for storing hydraulic oil, the outlet of which is connected to the oil pump motor unit via a pipeline; The oil pump motor unit is used to provide hydraulic power. The inlet and outlet of the main oil pump (4) of the oil pump motor unit are connected to the hydraulic station oil tank (1) and the control valve group (5) respectively. The control valve assembly (5) is used to control the movement of the hydraulic cylinder. The control valve assembly (5) is equipped with control valve components and is connected to the hydraulic pump and hydraulic cylinder through pipelines. The main cylinder (31) is used to perform the up and down movement of the press head of the single-arm hydraulic press. The main cylinder (31) is installed in the steel structure frame of the hydraulic press. The working press head is installed at the end of the piston rod of the main cylinder (31). The filling valve (20) is installed on the top of the main cylinder (31). The filling valve (20) is connected to the filling tank (22) through a pipeline. A filling tank (22) for quickly replenishing and absorbing the oil in the rodless chamber of the main cylinder (31) is provided, and the filling tank (22) is connected to the main cylinder (31) and the hydraulic station oil tank (1) through pipelines. An oil cooling device (30) for controlling the oil temperature of the hydraulic system is installed on one side of the hydraulic station oil tank (1); The oil pump motor assembly and control valve assembly (5) are both installed on the hydraulic station oil tank (1).

2. The hydraulic system of the marine single-arm hydraulic press as described in claim 1, characterized in that, The hydraulic station oil tank (1) is placed on one side of the hydraulic press and is divided into an oil storage chamber and an oil return chamber. The oil outlet of the oil storage chamber is connected to the main oil pump (4) through a pipeline. A first manual butterfly valve (2) and a first flexible connector (3) are installed on the oil outlet pipeline. The oil port of the oil return chamber is connected to the oil return pipeline through a second flexible connector (29). The top cover and side wall of the oil return chamber are equipped with an oil return filter (24), a second air filter (26), a liquid level relay (25), a temperature measuring thermocouple, a liquid level thermometer (28), and a second flexible connector (29).

3. The hydraulic system of the marine single-arm hydraulic press as described in claim 1, characterized in that, The oil pump motor unit includes: a main oil pump (4), an electric motor (36) and a coupling (37). The main oil pump (4) is connected to the electric motor (36) through the coupling (37) and is installed on one side of the base of the hydraulic station oil tank (1). The electric motor (36) drives the main oil pump (4) to provide pressure to the hydraulic system. The inlet of the main oil pump (4) is connected to the hydraulic station oil tank (1) through a first manual butterfly valve (2) and a flexible joint. The outlet of the main oil pump (4) is connected to the control valve group (5) through a pipeline. The manual butterfly valve is used to control the opening and closing of the pipeline, and the flexible joint is used to prevent pipeline vibration.

4. The hydraulic system of the marine single-arm hydraulic press as described in claim 1, characterized in that, The control valve assembly (5) is installed on the upper cover plate of the hydraulic station oil tank (1). The inlet of the control valve assembly (5) is connected to the outlet of the main oil pump (4) through a high-pressure hose. The control valve assembly (5) includes an oil circuit block and hydraulic valve components. The oil circuit block has flow channels machined inside to control the opening and closing of the hydraulic valve components. The oil circuit block includes an oil pump inlet P and four outlets. Outlet A is connected to the rodless chamber of the main oil cylinder (31), outlet B is connected to the rod chamber of the main oil cylinder (31), outlet K is connected to the control port of the filling valve (20), and outlet T is connected to the return oil filter. The device (24) is connected, and the hydraulic valves include a solenoid relief valve (6), a first check valve (7), an electro-hydraulic directional valve (8), a second check valve (9), a two-way cartridge valve (10), a solenoid ball valve (11), a third check valve (12), a back pressure valve (13), a hydraulically controlled check valve (14), a first solenoid directional valve (15), a second solenoid directional valve (16), a high-pressure relay (17), a low-pressure relay (18), a first pressure test connector (32), a second pressure test connector (33), a first pressure gauge (34), and a second pressure gauge (35).

5. The hydraulic system of the marine single-arm hydraulic press as described in claim 1, characterized in that, The main cylinder (31) is a piston cylinder. The oil ports of the rod chamber and rodless chamber of the main cylinder (31) are connected to the corresponding interfaces of the control valve group (5) through pipelines. The filling valve (20) is installed at the top of the rodless chamber of the main cylinder (31). The inlet and outlet of the filling valve (20) are connected to the filling tank (22) through flanges and pipelines. The control oil port of the filling valve (20) is connected to the corresponding interface of the control valve group (5) through pipelines.

6. The hydraulic system of the marine single-arm hydraulic press as described in claim 1, characterized in that, The filling tank (22) is placed on the upper platform of the steel structure frame of the hydraulic press. The interior of the filling tank (22) is divided into an oil storage chamber and an oil draining chamber by a partition. The oil storage chamber is connected to the filling valve (20) through a pipeline and a second manual butterfly valve (21). The oil draining chamber is connected to the hydraulic station oil tank (1) through a pipeline.

7. The hydraulic system of the marine single-arm hydraulic press as described in claim 1, characterized in that, The oil cooling device (30) operates independently of the hydraulic main circuit, and the oil cooling device (30) is connected to the hydraulic station oil tank through a hose.

8. The hydraulic system of the marine single-arm hydraulic press as described in claim 4, characterized in that, The electromagnetic relief valve (6) has high-pressure pilot control and low-pressure pilot control, which are used to control the start-up and unloading of the main oil pump (4) for the downward movement and return movement of the hydraulic press, respectively.

9. The hydraulic system of the marine single-arm hydraulic press as described in claim 4, characterized in that, The two-way cartridge valve (10) works in conjunction with the pilot-controlled solenoid ball valve (11) to control the rapid downward movement of the main cylinder (31).

10. The hydraulic system of the marine single-arm hydraulic press as described in claim 4, characterized in that, The back pressure valve (13) and the third check valve (12) are sequence valves, used to control the slow downward movement and rapid return of the rod chamber of the main cylinder (31), respectively. The electro-hydraulic directional valve (8) is controlled by internal control and internal leakage, used to control the downward and return movements of the main circuit of the hydraulic system. The second electromagnetic directional valve (16) is used to control the opening of the filling valve (20) when the cylinder returns quickly.

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