A Land-based Testing System and Method for Seawater Cylinder Performance Driven by Seawater Pressure

Abstract

A land-based performance testing system and method for seawater cylinders driven by seawater pressure is disclosed. The system includes a test bench, an environmental pressure simulated hydraulic system, a loading hydraulic system, and a control system. Performance testing of seawater cylinders driven by seawater pressure can be conducted on land, eliminating the need for testing within a pressure vessel. This significantly simplifies the testing system, shortens testing time, and reduces testing costs. The system is convenient to operate and highly safe. Parameter adjustments and optimizations are easily made, greatly improving testing efficiency. For different specifications of seawater cylinders, only transition parts and bellows need to be replaced, making it widely applicable.

Description

Technical Field

[0001] This invention relates to the field of underwater operation equipment technology, and in particular to a land-based testing system and method for testing the performance of a seawater cylinder driven by seawater pressure. Background Technology

[0002] Seawater cylinders driven by seawater pressure offer significant advantages in simplifying system structure and improving system reliability because they do not require an underwater hydraulic power source. They are particularly suitable for applications requiring large working depths, low power consumption, and where only one action (such as clamping, releasing, or shearing) needs to be completed per dive.

[0003] The basic principle is as follows: the rodless chamber is directly connected to the seawater environment, while the rod chamber is connected to the pressure tank via pipelines and a solenoid shut-off valve. Before diving, the pressure tank is filled with atmospheric pressure air, and the rod chamber is filled with atmospheric pressure oil. When the predetermined depth is reached and operation is required, a control command is issued through the control system to open the solenoid shut-off valve. The oil in the rod chamber flows into the atmospheric pressure tank, and under the action of the pressure difference, the piston extends, pushing the actuator to complete the action.

[0004] To limit the operating speed of the seawater cylinder and make the actuator move more smoothly, a throttling orifice is usually installed on the drain line from the rod chamber to the pressure tank. If the throttling orifice is too small, the cylinder's operating speed will be too low, reducing operating efficiency; if the throttling orifice is too large, risks such as speed shock and "cylinder collision" may occur. Therefore, the opening size of the throttling orifice has a significant impact on the output speed characteristics of the seawater cylinder.

[0005] Furthermore, during the piston extension process of the seawater anode, the oil in the rod chamber leaks into the pressure tank at atmospheric pressure. The gas inside the pressure tank is continuously compressed, increasing the pressure and causing an increase in the return oil pressure of the seawater anode, thus altering its output force characteristics. A larger pressure tank has a smaller impact on output force, but it also increases volume and weight. Therefore, determining the appropriate pressure tank volume is a key aspect that needs to be considered in the design of seawater anodes.

[0006] Therefore, after the design of the seawater tank is completed, a large number of tests are often required to obtain the output force characteristics of the seawater tank at different depths and its relationship with the pressure tank volume, as well as the relationship between the orifice opening and the output speed, in order to verify whether the design requirements are met, accumulate experimental data, and provide a reference for optimization and improvement. Since there is currently a lack of suitable land-based testing systems for seawater tanks driven by seawater pressure, tests are usually conducted directly inside the pressure tank. However, pressure tank testing systems are complex, time-consuming, and expensive, often failing to meet the requirements of high performance, short cycle time, and low cost. Summary of the Invention

[0007] To address the shortcomings of existing production technologies, the applicant provides a reasonably structured land-based performance testing system and method for seawater cylinders driven by seawater pressure. This system can be used for design verification of seawater cylinders on land, obtaining the output force and speed characteristics of the seawater cylinders under different pressures, and providing a reference for the optimized design of seawater cylinders.

[0008] The technical solution adopted in this invention is as follows:

[0009] A land-based performance testing system for a seawater cylinder driven by seawater pressure includes a test bench, an environmental pressure simulation water hydraulic system, a loading hydraulic system, and a control system.

[0010] The test bench structure includes: a mounting base, on which a seawater tank under test is hinged; a seawater tank inlet connector is provided on the seawater tank; a transition structure is threadedly connected to the piston rod end of the seawater tank; the transition structure has a hole in the middle through which a long shaft passes; and a bellows mounting seat, on which a bellows is installed between the bellows mounting seat and the outer end face of the transition structure; a threaded hole is opened in the center of the bellows mounting seat, and a bellows connector is installed on the threaded hole; the bellows connector is connected to the ambient pressure via a pipeline. Simulated hydraulic system connection; a No. 1 loading cylinder and a No. 2 loading cylinder are symmetrically installed on both sides of the bellows. The piston rod shackle of the No. 1 loading cylinder is fitted onto the long shaft, and a No. 1 through-hole force sensor is installed inside the piston rod shackle. The piston rod shackle of the No. 2 loading cylinder is fitted onto the long shaft, and a No. 2 through-hole force sensor is installed inside the piston rod shackle. Guide holes are symmetrically opened at both ends of the long shaft, and a No. 1 guide rod and a No. 2 guide rod pass through the guide holes. A displacement sensor is also installed on the outside of the No. 2 guide rod.

[0011] The structure of the environmental pressure simulation water hydraulic system is as follows: it includes a high-pressure water pump connected to a water tank, and the output end of the high-pressure water pump is connected in series with a high-pressure filter and a No. 1 electromagnetic reversing valve through a pipeline. The output end of the electromagnetic reversing valve is connected to the seawater tank under test and the bellows respectively. A No. 1 proportional overflow valve and a No. 1 pressure sensor are installed on the pipeline between the high-pressure filter and the electromagnetic reversing valve.

[0012] The structure of the loading hydraulic system is as follows: it includes a hydraulic pump connected to a hydraulic oil tank, the output end of the hydraulic pump is connected to a second solenoid directional valve through a pipeline, the output end of the second solenoid directional valve is connected to a first loading cylinder and a second loading cylinder respectively, the output end of the hydraulic pump is also connected to a safety valve, and a second pressure sensor and a second proportional relief valve are also installed on the pipeline between the second solenoid directional valve and the first loading cylinder.

[0013] The control system is used to set, adjust and perform closed-loop control of the output water pressure of the environmental simulation water hydraulic system, to set and perform closed-loop control of the loading force of the loading hydraulic system, and to collect and display the displacement signal of the tested seawater cylinder.

[0014] As a further improvement to the above technical solution:

[0015] The cross-section of the transition structure is a transverse "T" shape.

[0016] The central axis of the transition structure is perpendicular to the central axis of the major axis.

[0017] The bellows mounting base has an "L" shaped structure.

[0018] Both the No. 1 and No. 2 loading cylinders are fixed with loading cylinder mounting brackets.

[0019] Both the No. 1 through-hole force sensor and the No. 2 through-hole force sensor are mounted on the long shaft.

[0020] The second pressure sensor is used to collect the output pressure of the loading hydraulic system, and the collected signal is fed back to the test control system.

[0021] The thrust of loading cylinders 1 and 2, collected by the No. 1 through-hole force sensor and the No. 2 through-hole force sensor, is also fed back to the test control system. The test control system adjusts the opening of the No. 2 proportional overflow valve to make the output force of the loading system change according to a given pattern.

[0022] A test method for a land-based performance testing system for a seawater tank driven by seawater pressure as described in claim 1 includes the following steps:

[0023] S1: Preparations;

[0024] Before the test, the seawater tank to be tested was first installed on the test bench;

[0025] The rod chamber of the test seawater tank was filled with seawater;

[0026] Connect the outlet pipe of the environmental pressure simulated hydraulic system to the bellows joint and the seawater tank inlet joint respectively.

[0027] Connect the oil outlet lines of the loading hydraulic system to the rodless chambers of loading cylinder No. 1 and loading cylinder No. 2 respectively;

[0028] S2: Experimental work;

[0029] The set value of the No. 1 proportional relief valve of the hydraulic system was set by the test control system to simulate the environmental pressure, which is used as the force exerted by the deep-sea environmental pressure on the seawater tank.

[0030] Set the output force value of the loading hydraulic system so that the output force of loading cylinder No. 1 and loading cylinder No. 2 changes according to a given pattern;

[0031] During the experiment, the control system collected and recorded the displacement curves of the seawater tank;

[0032] By analyzing the displacement curve of the seawater cylinder under test, the output speed characteristics of the seawater cylinder under test under a certain seawater pressure and a certain external load can be obtained.

[0033] If the speed characteristics are not ideal, the size of the throttle orifice of the seawater tank under test can be adjusted, and the test can be repeated to obtain an optimized speed.

[0034] By keeping the loading force constant and adjusting the environmental pressure setting value, the test can be repeated to obtain the output speed variation law of the tested seawater cylinder under different pressures, thereby obtaining the output characteristics of the tested seawater cylinder applied at different operating depths.

[0035] By keeping the environmental pressure constant, adjusting the loading force, and repeating the test, the motion characteristics of the seawater tank under different loads can be obtained. By continuously increasing the loading force until the output speed of the seawater tank under test is zero, the maximum load capacity can be obtained.

[0036] Keep the loading force at zero, continuously reduce the environmental pressure setting value, and repeat the test until the seawater tank under test just stops moving. This will give you the minimum starting pressure of the seawater tank under test.

[0037] The beneficial effects of this invention are as follows:

[0038] This invention features a compact and reasonable structure, and is easy to operate. Through the coordinated operation of the test bench, the environmental pressure simulation water hydraulic system, the loading hydraulic system, and the control system, the design and verification of seawater cylinders can be easily carried out on land. The output force characteristics and output speed characteristics of the seawater cylinder under different pressures can be obtained, which can provide a reference for the optimized design of seawater cylinders. The test cycle is short and the cost is low.

[0039] This testing system allows for performance testing of seawater tanks driven by seawater pressure on land, eliminating the need for testing inside a pressure vessel. This significantly simplifies the testing system, shortens testing time, and reduces costs. The system is easy to operate and highly safe. Parameter adjustments and optimizations are readily available, greatly improving testing efficiency. For different specifications of seawater tanks, only transition parts and bellows need to be replaced, making it widely applicable. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the test bench of the present invention.

[0041] Figure 2 This is a detailed view of the test bench of the present invention.

[0042] Figure 3 This is a schematic diagram of the environmental pressure simulation water hydraulic system of the present invention.

[0043] Figure 4 This is a schematic diagram of the hydraulic system for this invention.

[0044] The components include: 1. Test bench; 2. Environmental pressure simulation water hydraulic system; 3. Loading hydraulic system;

[0045] 101. Mounting base; 102. Seawater tank inlet connector; 103. Test seawater tank; 104. Guide rod mounting base; 105. Guide rod No. 1; 106. Long shaft; 107. Force sensor No. 1 (through hole type); 108. Transition structure; 109. Bellows; 110. Bellows mounting base; 111. Bellows connector; 112. Loading cylinder No. 1; 113. Loading cylinder mounting base; 114. Loading cylinder No. 2; 115. Guide rod No. 2; 116. Force sensor No. 2 (through hole type); 117. Displacement sensor;

[0046] 201. Water tank; 202. High-pressure water pump; 203. High-pressure filter; 204. Proportional relief valve No. 1; 205. Pressure sensor No. 1; 206. Solenoid directional valve No. 1;

[0047] 301. Hydraulic oil tank; 302. Hydraulic pump; 303. Safety valve; 304. Proportional relief valve No. 2; 305. Pressure sensor No. 2; 306. Solenoid directional valve No. 2. Detailed Implementation

[0048] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0049] like Figures 1-4 As shown, the land-based performance testing system for a seawater cylinder driven by seawater pressure in this embodiment includes a test bench 1, an environmental pressure simulated water hydraulic system 2, a loading hydraulic system 3, and a control system.

[0050] The structure of the test bench 1 includes: a mounting base 101, on which a seawater tank 103 is hinged; a seawater tank inlet connector 102 is provided on the seawater tank 103; a transition structure 108 is threadedly connected to the piston rod end of the seawater tank 103; a long shaft 106 passes through a hole in the center of the transition structure 108; and a bellows mounting seat 110. A bellows 109 is installed between the bellows mounting seat 110 and the outer end face of the transition structure 108. A threaded hole is opened in the center of the bellows mounting seat 110, and a bellows connector 111 is installed on the threaded hole. The bellows connector 111 is connected to a ring via a pipe. The hydraulic system 2 is connected to the simulated water pressure system; a first loading cylinder 112 and a second loading cylinder 114 are symmetrically installed on both sides of the bellows 9. The piston rod shackle of the first loading cylinder 112 is fitted onto the long shaft 106, and a first through-hole force sensor 107 is installed in the piston rod shackle. The piston rod shackle of the second loading cylinder 114 is fitted onto the long shaft 106, and a second through-hole force sensor 116 is installed in the piston rod shackle. Guide holes are symmetrically opened at both ends of the long shaft 106, and a first guide rod 105 and a second guide rod 115 pass through the guide holes. A displacement sensor 117 is also installed on the outside of the second guide rod 115.

[0051] The structure of the environmental pressure simulation water hydraulic system 2 is as follows: it includes a high-pressure water pump 202 connected to the water tank 201. The output end of the high-pressure water pump 202 is connected in series with a high-pressure filter 203 and a first electromagnetic reversing valve 206 through a pipeline. The output end of the first electromagnetic reversing valve 206 is connected to the seawater tank under test 103 and the bellows 109 respectively. A first proportional overflow valve 204 and a first pressure sensor 205 are installed on the pipeline between the high-pressure filter 203 and the first electromagnetic reversing valve 206.

[0052] The structure of the loading hydraulic system 3 is as follows: it includes a hydraulic pump 302 connected to a hydraulic oil tank 301. The output end of the hydraulic pump 302 is connected to a second solenoid directional valve 306 through a pipeline. The output end of the second solenoid directional valve 306 is connected to a first loading cylinder 112 and a second loading cylinder 114 respectively. The output end of the hydraulic pump 302 is also connected to a safety valve 303. A second pressure sensor 305 and a second proportional relief valve 304 are also installed on the pipeline between the second solenoid directional valve 306 and the first loading cylinder 112.

[0053] The control system is used to set, adjust and perform closed-loop control of the output water pressure of the environmental pressure simulation water hydraulic system 2, to set and perform closed-loop control of the loading force of the loading hydraulic system 3, and to collect and display the displacement signal of the seawater tank 103 under test.

[0054] The cross-section of the transition structure 108 is a transverse "T" shape.

[0055] The central axis of the transition structure 108 is perpendicular to the central axis of the major axis 106.

[0056] The bellows mounting base 110 has an "L" shaped structure.

[0057] Both loading cylinder 112 and loading cylinder 114 are fixed by loading cylinder mounting base 113.

[0058] Both the No. 1 through-hole force sensor 107 and the No. 2 through-hole force sensor 116 are mounted on the long axis 106.

[0059] Pressure sensor 305 is used to collect the output pressure of the loading hydraulic system 3, and the collected signal is fed back to the test control system.

[0060] The thrust of loading cylinder 112 and loading cylinder 114 collected by the first through-hole force sensor 107 and the second through-hole force sensor 116 is also fed back to the test control system. The test control system adjusts the opening of the second proportional overflow valve 304 to make the output force of the loading system change according to a given pattern.

[0061] The specific structure and function of the land-based performance testing system for seawater tanks based on seawater pressure drive described in this invention are as follows:

[0062] It mainly includes a test bench 1, an environmental pressure simulation water hydraulic system 2, a loading hydraulic system 3, and a control system.

[0063] The structure of the test bench 1 mainly includes: mounting base 101, seawater tank inlet connector 102, seawater tank under test 103, guide rod mounting seat 104, first guide rod 105, long shaft 106, first through-hole force sensor 107, transition structure 108, bellows 109, bellows mounting seat 110, bellows connector 111, first loading cylinder 112, loading cylinder mounting seat 113, second loading cylinder 114, second guide rod 115, second through-hole force sensor 116, displacement sensor 117, etc.

[0064] The seawater tank 103 under test is hinged to its mounting base 101. The piston rod end of the seawater tank 103 under test is connected to a transition structure 108 by a thread. The transition structure 108 has a hole in the middle, through which a long shaft 106 passes. The other end of the transition structure 108 is a plane with a sealing groove on it. A sealing ring is installed in the sealing groove.

[0065] The bellows 109 has a No. 1 flange face and a No. 2 flange face welded to both ends. The plane of the transition structure 108 is connected to the No. 1 flange face of the bellows 109 by screws. A sealing groove is opened on the plane of the bellows mounting seat 110, and a sealing ring is installed in the sealing groove. The No. 2 flange face of the bellows 109 is connected to the bellows mounting seat 110 by screws. A threaded hole is opened in the center of the bellows mounting seat 110, and a bellows connector 111 is installed on the threaded hole. The bellows connector 111 is connected to the output tee connector of the environmental pressure simulated water hydraulic system 2 through a pipeline.

[0066] A first loading cylinder 112 and a second loading cylinder 114 are symmetrically mounted on both sides of the bellows 109. A first through-hole force sensor 107 and a second through-hole force sensor 116 are respectively installed in the piston rod lugs of the first loading cylinder 112 and the second loading cylinder 114, both passing through the long shaft 106. A first guide rod 105 and a second guide rod 115 are symmetrically mounted on both sides of the first loading cylinder 112 and the second loading cylinder 114, respectively. Guide holes are symmetrically opened at both ends of the long shaft 106, and the first guide rod 105 and the second guide rod 115 pass through the guide holes. A displacement sensor 117 is also installed on the outside of the second guide rod 115, which is used to detect the displacement of the tested seawater tank 103. The first through-hole force sensor 107 and the second through-hole force sensor 116 are used to detect the thrust of the first loading cylinder 112 and the second loading cylinder 114, respectively.

[0067] The structure of the environmental pressure simulation water hydraulic system 2 is as follows:

[0068] It mainly includes water tank 201, high-pressure water pump 202, high-pressure filter 203, No. 1 proportional overflow valve 204, No. 1 pressure sensor 205, No. 1 solenoid directional valve 206, pipelines, connectors, etc.

[0069] Water enters the high-pressure water pump 202 through the suction pipe. The high-pressure water pump 202 discharges high-pressure water, which is filtered by the high-pressure filter 203. Its pressure is set and regulated by the first proportional relief valve 204 to simulate the pressure of the deep-sea environment. The high-pressure water output from the environmental pressure simulation water hydraulic system 2 is connected to the seawater tank inlet connector 102 and the bellows connector 111 through pipes and tee fittings, respectively.

[0070] The structure of the loading hydraulic system 3 is as follows:

[0071] It mainly includes hydraulic oil tank 301, hydraulic pump 302, safety valve 303, No. 2 proportional relief valve 304, No. 2 pressure sensor 305, No. 2 solenoid directional valve 306, pipelines, connectors, etc.

[0072] The high-pressure oil output by the hydraulic pump 302 is connected to the first loading cylinder 112 and the second loading cylinder 114 through the second solenoid directional valve 306, pipeline, and tee connector.

[0073] The second pressure sensor 305 is used to collect the output pressure of the loading hydraulic system 3. The collected signal is fed back to the test control system. The thrust of the first loading cylinder 112 and the second loading cylinder 114 collected by the first through-hole force sensor 107 and the second through-hole force sensor 116 is also fed back to the test control system. The test control system adjusts the opening of the second proportional relief valve 304 to make the output force of the loading system change according to a given pattern.

[0074] It also includes a test control system, which is used to set, adjust, and perform closed-loop control of the output water pressure of the environmental pressure simulation water hydraulic system 2, and to set and perform closed-loop control of the loading force of the loading hydraulic system 3. It is also used for the acquisition and display of displacement signals from the tested seawater tank 103.

[0075] The water pressure inside the bellows 109 is equal to the water pressure entering the rodless chamber. As long as the bellows diameter is set to be equal to the piston rod diameter, the environmental pressure load applied to the piston rod end of the seawater cylinder is the same as in the deep sea. Thus, the stress conditions of the seawater cylinder are consistent with those in the deep sea. By simulating the external load characteristics of the seawater cylinder, it can be used to study and test the output force and displacement characteristics of the seawater cylinder on land.

[0076] In actual work process:

[0077] During the experiment, the seawater tank was first installed on test bench 1, and then... Figure 1 The installation is complete as shown.

[0078] The rod chamber of the seawater tank 103 under test is filled with seawater, and the electromagnetic shut-off valve of the seawater tank is in the closed state.

[0079] The outlet pipe of the environmental pressure simulation water hydraulic system 2 is connected to the corrugated pipe joint 111 and the seawater tank inlet joint 102, respectively.

[0080] The oil outlet lines of the loading hydraulic system 3 are respectively connected to the rodless chambers of loading cylinder 112 and loading cylinder 114.

[0081] Conduct the experiment according to the following steps.

[0082] First, the environmental pressure is set through the test control system to simulate the setting value of the first proportional overflow valve 204 of the hydraulic system 2, which is used as the force exerted by the deep-sea environmental pressure on the seawater tank.

[0083] 2. Set the output force value of the loading hydraulic system 3 so that the output force of loading cylinder 112 and loading cylinder 114 changes according to a given pattern.

[0084] 3. Open the solenoid shut-off valve of the seawater tank. During the test, the control system collects and records the displacement curve of the seawater tank.

[0085] By analyzing the displacement curve of the seawater cylinder, the output speed characteristics of the seawater cylinder under a certain seawater pressure and a certain external load can be obtained. If the speed characteristics are not ideal, the size of the throttle orifice of the seawater cylinder can be adjusted, and the experiment can be repeated to obtain an optimized speed.

[0086] By keeping the loading force constant and adjusting the environmental pressure setting, the experiment can be repeated. This allows us to observe the variation in the output speed of the seawater cylinder under different pressures, thus revealing the output characteristics of the seawater cylinder applied at different operating depths.

[0087] By keeping the ambient pressure constant and adjusting the loading force, the motion characteristics of the seawater tank under different loads can be obtained by repeating the experiment. By continuously increasing the loading force until the output speed of the seawater tank reaches zero, its maximum load capacity can be obtained.

[0088] Keep the load force at zero and continuously reduce the environmental pressure setpoint, repeating the test until the seawater tank just stops moving; this gives the minimum starting pressure of the seawater tank.

[0089] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A land-based performance testing system for a seawater tank driven by seawater pressure, characterized in that: It includes a test bench (1), an environmental pressure simulation water hydraulic system (2), a loading hydraulic system (3), and a control system; The structure of the test bench (1) is as follows: it includes a mounting base (101), on which a seawater tank (103) is hinged, and a seawater tank inlet connector (102) is provided on the seawater tank (103). The piston rod end of the seawater tank (103) is connected to a transition structure (108) by a thread. The transition structure (108) has a hole in the middle, and a long shaft (106) passes through the hole. It also includes a bellows mounting seat (110), and a bellows (109) is installed between the bellows mounting seat (110) and the outer end face of the transition structure (108). The bellows mounting seat (110) has a threaded hole in the center, and a bellows connector (111) is installed on the threaded hole. The bellows connector (111) is connected to a pipeline. It is connected to the environmental pressure simulation water hydraulic system (2); a first loading cylinder (112) and a second loading cylinder (114) are symmetrically installed on both sides of the bellows (109). The piston rod shackle of the first loading cylinder (112) is fitted on the long shaft (106), and a first through-hole force sensor (107) is installed in the piston rod shackle. The piston rod shackle of the second loading cylinder (114) is fitted on the long shaft (106), and a second through-hole force sensor (116) is installed in the piston rod shackle. Guide holes are symmetrically opened at both ends of the long shaft (106). A first guide rod (105) and a second guide rod (115) pass through the guide holes. A displacement sensor (117) is also installed on the outside of the second guide rod (115). The structure of the environmental pressure simulation water hydraulic system (2) is as follows: it includes a high-pressure water pump (202) connected to a water tank (201). The output end of the high-pressure water pump (202) is connected in series with a high-pressure filter (203) and a first electromagnetic reversing valve (206) through a pipeline. The output end of the first electromagnetic reversing valve (206) is connected to the seawater tank (103) under test and the bellows (109) respectively. A first proportional overflow valve (204) and a first pressure sensor (205) are installed on the pipeline between the high-pressure filter (203) and the first electromagnetic reversing valve (206). The structure of the loading hydraulic system (3) is as follows: it includes a hydraulic pump (302) connected to a hydraulic oil tank (301), the output end of the hydraulic pump (302) is connected to a second electromagnetic directional valve (306) through a pipeline, the output end of the second electromagnetic directional valve (306) is connected to a first loading cylinder (112) and a second loading cylinder (114) respectively, the output end of the hydraulic pump (302) is also connected to a safety valve (303), and a second pressure sensor (305) and a second proportional relief valve (304) are also installed on the pipeline between the second electromagnetic directional valve (306) and the first loading cylinder (112); The control system is used to set, adjust and control the output water pressure of the environmental simulation water hydraulic system (2), to set and control the loading force of the loading hydraulic system (3), and to collect and display the displacement signal of the seawater tank (103) under test.

2. The onshore performance testing system for a seawater tank based on seawater pressure as described in claim 1, characterized in that: The cross-section of the transition structure (108) is a transverse "T" shape.

3. The onshore performance testing system for a seawater tank based on seawater pressure as described in claim 1, characterized in that: The central axis of the transition structure (108) is perpendicular to the central axis of the major axis (106).

4. The onshore performance testing system for a seawater tank based on seawater pressure as described in claim 1, characterized in that: The bellows mounting base (110) has an "L" shaped structure.

5. The onshore performance testing system for a seawater tank based on seawater pressure as described in claim 1, characterized in that: Both the No. 1 loading cylinder (112) and the No. 2 loading cylinder (114) are fixed by the loading cylinder mounting base (113).

6. The onshore performance testing system for a seawater tank based on seawater pressure as described in claim 1, characterized in that: Both the No. 1 through-hole force sensor (107) and the No. 2 through-hole force sensor (116) are mounted on the long shaft (106).

7. The onshore performance testing system for a seawater tank based on seawater pressure as described in claim 1, characterized in that: The second pressure sensor (305) is used to collect the output pressure of the loading hydraulic system (3), and the collected signal is fed back to the test control system.

8. The onshore performance testing system for a seawater tank based on seawater pressure as described in claim 1, characterized in that: The thrust of the first loading cylinder (112) and the second loading cylinder (114) collected by the first through-hole force sensor (107) and the second through-hole force sensor (116) is also fed back to the test control system. The test control system adjusts the opening of the second proportional relief valve (304) to make the output force of the loading system change according to a given law.

9. A test method for a land-based performance testing system for a seawater tank driven by seawater pressure as described in claim 1, characterized in that: The following steps are included: S1: Preparations; Before the test, the seawater tank (103) to be tested was installed on the test bench (1); The rod chamber of the seawater tank (103) being tested was filled with seawater; Connect the outlet pipe of the environmental pressure simulation water hydraulic system (2) to the corrugated pipe joint (111) and the seawater tank inlet joint (102) respectively; Connect the oil outlet line of the loading hydraulic system (3) to the rodless chambers of the first loading cylinder (112) and the second loading cylinder (114) respectively; S2: Experimental work; The set value of the No. 1 proportional overflow valve (204) of the simulated hydraulic system (2) is set by the test control system to represent the force exerted by the deep-sea environment pressure on the seawater cylinder. Set the output force value of the loading hydraulic system (3) so that the output force of the first loading cylinder (112) and the second loading cylinder (114) changes according to a given pattern; During the experiment, the control system collected and recorded the displacement curves of the seawater tank; By analyzing the displacement curve of the seawater tank (103) under test, the output speed characteristics of the seawater tank (103) under a certain seawater pressure and a certain external load can be obtained. If the speed characteristics are not ideal, the size of the throttle orifice of the seawater tank (103) under test can be adjusted, and the test can be repeated to obtain the optimized speed. By keeping the loading force constant and adjusting the environmental pressure setting value, the test can be repeated to obtain the output speed variation law of the test seawater tank (103) under different pressures, thereby obtaining the output characteristics of the test seawater tank (103) applied at different working depths. By keeping the environmental pressure constant, adjusting the loading force, and repeating the test, the motion characteristics of the seawater tank under different loads can be obtained. By continuously increasing the loading force until the output speed of the seawater tank (103) under test is zero, the maximum load capacity can be obtained. Keep the loading force at zero, continuously reduce the environmental pressure setting value, and repeat the test until the seawater tank (103) under test just stops moving. This will give you the minimum starting pressure of the seawater tank (103) under test.

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