WO2023213041A1

WO2023213041A1 - Seawater fatigue cycle simulation experimental device and experimental method

Info

Publication number: WO2023213041A1
Application number: PCT/CN2022/121328
Authority: WO
Inventors: 朱永梅; 潘洪章; 王浩; 周程远; 王维莉; 苏世杰; 殷宝吉; 张建
Original assignee: 江苏科技大学
Priority date: 2022-05-05
Filing date: 2022-09-26
Publication date: 2023-11-09
Also published as: CN114894645A; KR20230156683A

Abstract

A seawater fatigue cycle simulation experimental device, comprising a circulating pressure cabin cylinder body (1) and an experimental cabin cylinder body (2), which are respectively sealed by means of upper end covers (3), wherein side edges of the two cylinder bodies are in communication with each other by means of a connecting pipe column (4); a pressure guide rod (5) is provided in the connecting pipe column (4); two ends of the pressure guide rod (5) respectively extend into the circulating pressure cabin cylinder body (1) and the experimental cabin cylinder body (2), and are respectively connected to a pressed block (6) and a pressure guide block (7); a side edge of the pressed block (6) and a side edge of the pressure guide block (7) are respectively sealed with an inner surface of the circulating pressure cabin cylinder body (1) and an inner surface of the experimental cabin cylinder body (2) by means of first sealing gaskets (8); an anti-corrosion plate (9) is attached to a surface of an experimental cavity; the upper end cover (3) of the circulating pressure cabin cylinder body (1) is provided with a high-pressure water intake pipe (10), a water output pipe (11) and a pressure relief needle valve (12); and the upper end cover (3) of the experimental cabin cylinder body (2) is provided with a water-conveying pipe (13), a pressure sensor (14) and the pressure relief needle valve (12). The experimental device further comprises a control system. The experimental device can apply circulating pressure and maintain pressure, is convenient to manufacture, transport, place and use, and has a good sealing performance and low noise, thus being more suitable for a seawater fatigue cycle simulation experiment.

Description

A seawater fatigue cycle simulation test device and test method

Technical field

The invention relates to the field of marine equipment, and in particular to a seawater fatigue cycle simulation test device and a test method.

Background technique

With the advancement of science and technology, human beings have an increasingly strong need for the exploration and development of marine resources. The detection of the ocean is based on the research and development of deep-sea equipment. Therefore, the research and development of simulated marine environment test equipment is very important. Marine environment simulation test equipment can effectively reduce the cost and cycle of marine equipment research and development.

Currently, in the field of hydraulic environment simulation test equipment, the test devices have the following shortcomings:

(1) During the process of hydraulic pressure application, most of the tested parts were damaged by static pressure, which is quite different from the pressure environment encountered by offshore engineering equipment in actual use;

(2) Water pressure simulation test equipment mostly uses non-corrosive water as the medium, ignoring the corrosiveness of actual seawater to metal containers;

(3) The loads in the hydraulic pressure simulation test are all static loads, and the diversity of cyclic loads, such as triangular waves, sine waves, trapezoidal waves, etc., are not considered;

(4) Due to the large size of the test cabin, the convenience of installation, operation and maintenance was not considered.

Contents of the invention

Purpose of the invention: In order to overcome the shortcomings of the background technology, the first purpose of the present invention is to disclose a seawater fatigue cycle simulation test device, and the second purpose is to disclose a seawater fatigue cycle simulation test method using the above test device.

Technical solution: The seawater fatigue cycle simulation test device disclosed in the present invention includes a circulating pressure chamber cylinder and a test chamber cylinder, which are sealed by upper end covers respectively. The sides of the circulating pressure chamber cylinder and the test chamber cylinder are connected by connecting pipes. The connecting pipe column is connected with a pressure guide rod, and the two ends of the pressure guide rod extend to the cylinder of the circulating pressure chamber and the cylinder of the test chamber, and are connected to a pressure block and a pressure guide block respectively. The sides of the pressure block and the pressure guide block are sealed with the inner surface of the circulating pressure chamber cylinder and the test chamber cylinder by a first sealing gasket. The side of the pressure block away from the pressure guide rod forms pressure with the inner surface of the circulating pressure chamber cylinder. The side of the pressure guide block away from the pressure guide rod forms a test chamber with the inner surface of the test chamber cylinder. The surface of the test chamber is covered with an anti-corrosion plate. The upper end cover of the circulation pressure chamber cylinder is provided with a high-pressure water inlet pipe. Water outlet pipe and pressure relief needle valve. The upper end cover of the test chamber cylinder is equipped with a water delivery pipe, a pressure sensor and a pressure relief needle valve;

It also includes a control system, which includes an air compressor, a driving pressure regulating valve, a driving pressure gauge, a first solenoid valve, a gas-liquid booster pump, a water tank, a second solenoid valve, a pressure transmitter, and a throttle valve. Corrosion-resistant pump and control platform, the air compressor is connected to the driving pressure regulating valve, the driving air pressure gauge is connected to the driving pressure regulating valve and the first solenoid valve, the gas-liquid boosting pump is connected to the first solenoid valve, the water tank and the first solenoid valve respectively. The high-pressure water inlet pipe, the water outlet pipe is connected to the water tank, and a second solenoid valve, a pressure transmitter and a throttle valve are arranged in between. The control platform is connected to the first solenoid valve, the second solenoid valve, the pressure transmitter and the throttle valve. flow valves and corrosion-resistant pumps.

Further, the control platform includes an A/D converter, an industrial computer, a D/A converter, a driver, and an oscilloscope, where the driver is connected to the first solenoid valve, the second solenoid valve, and the throttle valve, and the A/D conversion The device is connected to the pressure transmitter and pressure sensor, and the preset pressure P1, critical pressure P0, number of pressure cycles n, single pressure holding time t0, pressurization time t1, and unloading time t2 can be set through the control platform. The set preset pressure P1 is the target pressure value of the fatigue cycle pressure of the tested piece.

Further, the upper end cover is provided with a threaded through hole, and the pressure inlet water pipe, water outlet pipe, pressure relief needle valve, water pipe and pressure sensor are connected to the upper end cover through the threaded through hole.

Further, the sealing structures of the circulating pressure chamber cylinder and the test chamber cylinder are consistent with the upper end cover; the upper opening of the circulating pressure chamber cylinder is a concave edge, and the lower surface of the upper end cover is in line with the concave edge. The edges correspond to the spliced outer convex surfaces, and the different faces of the spliced joint are sealed by second sealing gaskets respectively. The upper end cover is provided with a positioning compression block, and the upper edge of the cylinder body of the circulation pressure chamber is upwardly aligned with the positioning compression block. Fit and tighten with positioning hold-down pins.

Further, it also includes a gantry, which is provided with two vertically downward cylinders, and the extended end of the cylinder is connected to the upper end cover. The bottom of the gantry, the circulating pressure chamber cylinder and the test chamber cylinder are all Equipped with universal wheels.

A seawater fatigue cycle simulation test method, using the above-mentioned seawater fatigue cycle simulation test device, includes the following steps:

S1. Open the upper end cover, put the test piece into the test chamber cylinder, cover the upper end cover, open the pressure relief needle valve on the upper end cover until the upper end cover is tightly against the test chamber cylinder to form a seal; open the corrosion-resistant pump to test Input the test liquid into the chamber and discharge the air from the test chamber at the same time. After the air is exhausted, close the corrosion-resistant pump and the pressure relief needle valve successively;

S2. Set the preset pressure P1, critical pressure P0, pressure cycle times n, single pressure holding time t0, pressurization time t1, and unloading time t2 through the control platform. The set preset pressure P1 is the test piece. Set the target pressure value of the fatigue cycle pressure, turn on the air compressor, adjust the drive pressure regulating valve, observe the value of the drive air pressure gauge to ensure that the input gas pressure is the required value, and start the control platform;

S3. The control platform controls the solenoid coil of the first solenoid valve to be energized, and the gas is input into the gas-liquid booster pump. The water in the water tank is injected into the cylinder of the circulating pressure chamber through the gas-liquid boosting pump. The pressure in the circulating pressure chamber gradually rises. The pressure passes through the pressure block and is introduced into the test chamber through the pressure guide rod and pressure guide block. The real-time pressure in the test chamber is output to the control platform through the pressure sensor;

S4. The pressure in the test chamber increases to the preset pressure P1. The control platform controls the first solenoid valve solenoid coil to cut off power, disconnect the fluid circuit, and the test chamber enters the pressure maintaining stage. After the pressure holding time reaches t0, the control platform controls the second solenoid valve. The valve opens, and the liquid in the circulating pressure chamber flows back into the water tank through the outlet pipe, throttle valve, and second solenoid valve; after the unloading time reaches t2, the pressure in the test chamber drops to the critical value P0, and the control platform controls the second solenoid valve. valve closed;

S5. Repeat steps S3-S4 until the number of test repetitions reaches n, the number of cyclic pressure applications of the control platform. End the test and stop the cycle. At the end of the test, control the second solenoid valve to open by adjusting the control platform and maintain the unloading state. When the control platform When the real-time pressure of the test chamber is displayed as 0, the control platform controls the second solenoid valve to close, opens the pressure relief needle valve to release the pressure in the test chamber, opens the upper end cover, and takes out the test piece for observation.

Beneficial effects: Compared with the existing technology, the advantages of the present invention are: an anti-corrosion layer is provided in the test cabin, and the corresponding corrosion fatigue test can be carried out on the test piece; the corrosive liquid in the test cabin only passes through the corrosion-resistant pump and does not pass through other Electrical components effectively protect other metal parts; the circulating pressure chamber is equipped with a high-pressure water inlet pipe to control the pressure inside the cabin. The pressure environment is stable and easy to adjust, which can realize a pressure cycle fatigue environment; equipped with a control platform, the The control platform can realize the control and adjustment of applying cyclic pressure and pressure maintenance to the test piece, and can realize the timing and counting of experiments, the monitoring of real-time pressure in the test chamber, and the recording and output of relevant test data.

Description of the drawings

Figure 1 is a general structural diagram of the present invention;

Figure 2 is a cross-sectional view of the cylinder of the circulating pressure chamber and the cylinder of the test chamber of the present invention;

Figure 3 is an external perspective view of the cylinder of the circulating pressure chamber and the cylinder of the test chamber of the present invention;

Figure 4 is a partial enlarged view of A in Figure 2;

Figure 5 is a schematic diagram of the control platform of the present invention;

Figure 6 is a partial enlarged view of B in Figure 2;

Figure 7 is a partial cross-sectional view of C in Figure 2 .

Detailed ways

The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and examples.

The seawater fatigue cycle simulation test device shown in Figure 1-4 includes a circulating pressure chamber cylinder 1 and a test chamber cylinder 2, which are sealed by an upper end cover 3 respectively. The circulating pressure chamber cylinder 1 and the test chamber cylinder 2 The sides are connected through a connecting pipe column 4. A pressure guiding rod 5 is installed inside the connecting pipe column 4. Both ends of the pressure guiding rod 5 extend into the circulating pressure chamber cylinder 1 and the test chamber cylinder 2, and are respectively connected to The sides of the pressure-receiving block 6 and the pressure-guiding block 7 are sealed with the inner surfaces of the circulating pressure chamber cylinder 1 and the test chamber cylinder 2 through a first sealing gasket 8. The side of the pressure block 6 away from the pressure guide rod 5 forms a pressure chamber with the inner surface of the circulation pressure cabin cylinder 1, and the side of the pressure guide block 7 away from the pressure guide rod 5 forms a test chamber with the inner surface of the test cabin cylinder 2. The surface of the test chamber is covered with an anti-corrosion plate 9. The anti-corrosion plate material is polytetrafluoroethylene, which has low cost and good seawater corrosion resistance. The upper end cover of the circulating pressure chamber cylinder 1 is provided with a high-pressure water inlet pipe 10, Water outlet pipe 11 and pressure relief needle valve 12. The upper end cover of the test cabin cylinder 2 is provided with a water delivery pipe 13, a pressure sensor 14 and a pressure relief needle valve 12;

It also includes a control system, which includes an air compressor 15, a driving pressure regulating valve 16, a driving air pressure gauge 17, a first solenoid valve 18, a gas-liquid booster pump 19, a water tank 20, a second solenoid valve 21, a pressure variable transmitter 22, throttle valve 23, corrosion-resistant pump 24 and control platform 25, the air compressor 15 is connected to the driving pressure regulating valve 16, the driving air pressure gauge 17 is connected to the driving pressure regulating valve 16 and the first solenoid valve 18, The gas-liquid booster pump 19 is respectively connected to the first solenoid valve 18, the water tank 20 and the high-pressure water inlet pipe 10. The water outlet pipe 11 is connected to the water tank 20, with a second solenoid valve 21, a pressure transmitter 22 and a section in between. Flow valve 23, the control platform 25 is connected to the first solenoid valve 18, the second solenoid valve 21, the pressure transmitter 22, the throttle valve 23 and the corrosion-resistant pump 24.

As shown in Figure 5, the control platform 25 includes an A/D converter 2501, an industrial computer 2502, a D/A converter 2503, a driver 2504, and an oscilloscope 2505. The driver 2504 is connected with the first solenoid valve 18 and the second solenoid valve. 21. The throttle valve 23 is connected, and the A/D converter 2501 is connected to the pressure transmitter 22 and the pressure sensor 14. The preset pressure P1, critical pressure P0, and number of pressure cycles n, can be set through the control platform 25. The single holding time t0, pressurizing time t1, and unloading time t2, the preset pressure P1 is the target pressure value of the fatigue cycle pressure of the test piece.

Specifically, the main load applied by the present invention is a trapezoidal wave, and the curve displayed on the control platform 25 should conform to the following formula, pressurization stage:

Pressure holding stage: P=P1; Unloading stage:

Among them, P1 is the preset pressure, t0 is the holding time, t1 is the pressurization time, t2 is the unloading time, P is the real-time pressure, t' is the starting time of this cycle, and t is the test time.

The upper end cover 3 is provided with threaded through holes, and the high-pressure water inlet pipe 10, water outlet pipe 11, pressure relief needle valve 12, water pipe 13 and pressure sensor 14 are connected to the upper end cover 3 through threaded through holes.

The sealing structures of the circulating pressure chamber cylinder 1 and the test chamber cylinder 2 are consistent with the upper end cover 3; the upper opening of the circulating pressure chamber cylinder 1 is an inner concave edge, and the lower surface of the upper end cover 3 is in line with the sealing structure. The inner concave edge corresponds to the spliced outer convex surface and has good self-positioning.

As shown in Figures 6 and 7, different surfaces of the joint are sealed by second sealing pads 26 respectively. The upper end cover 3 is provided with a positioning compression block 27. The upper edge of the cylinder 1 of the circulating pressure chamber It cooperates upward with the positioning compression block 27 and is tightened by the positioning compression pin 28 . Two forms of multiple seals, good sealing effect.

It also includes a gantry 29. Two vertically downward cylinders 31 are provided on the gantry 29. The extended end of the cylinder 31 is connected to the upper end cover 3. The gantry 29, the circulation pressure chamber cylinder 1 and the test chamber The bottom of the cylinder 2 is provided with universal wheels 30 .

Using the above-mentioned seawater fatigue cycle simulation test device, the seawater fatigue cycle simulation test method includes the following steps:

S1. Open the upper end cover 3, put the test piece into the test cabin cylinder 1, cover the upper end cover 3, open the pressure relief needle valve 12 on the upper end cover 3 until the upper end cover 3 is tightly against the test cabin cylinder 1 to form a seal. ; Turn on the corrosion-resistant pump 24 to input the test liquid into the test chamber cylinder 2, and at the same time discharge the air in the test chamber. After the air is exhausted, close the corrosion-resistant pump 24 and the pressure relief needle valve 12 successively;

S2. Set the preset pressure P1, critical pressure P0, pressure cycle times n, single pressure holding time t0, pressurization time t1, and unloading time t2 through the control platform 25. The set preset pressure P1 is the test object. According to the target pressure value of the fatigue cycle of the component, open the air compressor 15, adjust the driving pressure regulating valve 16, observe the value of the driving air pressure gauge 17 to ensure that the input gas pressure is the required value, and start the control platform 25;

S3. The control platform 25 controls the electromagnetic coil of the first solenoid valve 18 to be energized, and the gas is input into the gas-liquid booster pump 19. The water in the water tank 20 is injected into the cylinder 1 of the circulating pressure chamber through the gas-liquid boosting pump 19, and the circulating pressure chamber is The pressure inside gradually rises, and the pressure passes through the pressure block 6 and is introduced into the test chamber through the pressure guide rod 5 and the pressure guide block 7. The real-time pressure in the test chamber is output to the control platform 25 through the pressure sensor 14;

S4. The pressure of the test chamber increases to the preset pressure P1, and the control platform 25 controls the first solenoid valve 18 to cut off the power to the solenoid coil, disconnect the fluid line, and the test chamber enters the pressure maintaining stage; after the pressure holding time reaches t0, the control platform 25 controls The second solenoid valve 21 opens, and the liquid in the circulation pressure chamber flows back into the water tank 20 through the outlet pipe 11, the throttle valve 23, and the second solenoid valve 21; after the unloading time reaches t2, the pressure in the test chamber drops to the critical value. P0, the control platform 25 controls the second solenoid valve 21 to close;

S5, repeat steps S3-S4 until the number of test repetitions reaches n, the number of cyclic pressure applications of the control platform 25, end the test and stop the cycle; at the end of the test, control the second solenoid valve 21 to open by adjusting the control platform 25 to maintain the unloading state. When the control platform 25 displays that the real-time pressure of the test cabin is 0, the control platform 25 controls the second solenoid valve 21 to close, opens the pressure relief needle valve 12 to release the pressure in the test cabin, opens the upper end cover 3, and takes out the test piece for observation. .

Claims

A seawater fatigue cycle simulation test device, characterized by: including a circulating pressure chamber cylinder (1) and a test chamber cylinder (2), which are sealed by upper end covers (3) respectively. The circulating pressure chamber cylinder (1) It is connected to the side of the test cabin cylinder (2) through a connecting pipe column (4). The connecting pipe column (4) is equipped with a pressure guide rod (5), and both ends of the pressure guide rod (5) extend to the circulating pressure. The cabin cylinder (1) and the test cabin cylinder (2) are respectively connected with a pressure-receiving block (6) and a pressure-guiding block (7). The pressure-receiving block (6) and the pressure-guiding block (7) are The side and the inner surface of the circulation pressure chamber cylinder (1) and the test chamber cylinder (2) are sealed by the first sealing gasket (8), and the side of the pressure block (6) away from the pressure guide rod (5) is in contact with the circulation The inner surface of the pressure chamber cylinder (1) forms a pressure chamber, and the side of the pressure guide block (7) away from the pressure guide rod (5) forms a test chamber with the inner surface of the test chamber cylinder (2). The surface of the test chamber is attached to Covered with anti-corrosion panels (9), the upper end cover of the circulating pressure chamber cylinder (1) is provided with a high-pressure water inlet pipe (10), an outlet pipe (11) and a pressure relief needle valve (12). The test chamber cylinder (1) 2) The upper end cover is equipped with a water pipe (13), a pressure sensor (14) and a pressure relief needle valve (12);

It also includes a control system, which includes an air compressor (15), a driving pressure regulating valve (16), a driving air pressure gauge (17), a first solenoid valve (18), a gas-liquid booster pump (19), and a water tank. (20), the second solenoid valve (21), the pressure transmitter (22), the throttle valve (23), the corrosion-resistant pump (24) and the control platform (25), the air compressor (15) is connected to the drive The pressure regulating valve (16), the driving pressure gauge (17) is connected to the driving pressure regulating valve (16) and the first solenoid valve (18), and the gas-liquid boosting pump (19) is connected to the first solenoid valve (18) respectively. ), a water tank (20) and a high-pressure water inlet pipe (10). The water outlet pipe (11) is connected to the water tank (20), and a second solenoid valve (21), a pressure transmitter (22) and a throttle valve are arranged in between. (23), the control platform (25) is connected to the first solenoid valve (18), the second solenoid valve (21), the pressure transmitter (22), the throttle valve (23) and the corrosion-resistant pump (24).
The seawater fatigue cycle simulation test device according to claim 1, characterized in that: the control platform (25) includes an A/D converter (2501), an industrial computer (2502), a D/A converter (2503), Driver (2504), oscilloscope (2505), where the driver (2504) is connected to the first solenoid valve (18), the second solenoid valve (21), and the throttle valve (23), and the A/D converter (2501) is connected to The pressure transmitter (22) and the pressure sensor (14) are connected, and the preset pressure P1, critical pressure P0, number of pressure cycles n, single pressure holding time t0, and pressurization time can be set through the control platform (25) t1, unloading time t2, the set preset pressure P1 is the target pressure value of the fatigue cycle compression of the test piece.
The seawater fatigue cycle simulation test device according to claim 1, characterized in that: the upper end cover (3) has threaded through holes, the high-pressure water inlet pipe (10), the water outlet pipe (11), the pressure relief needle valve ( 12), the water pipe (13) and the pressure sensor (14) are connected to the upper end cover (3) through threaded through holes.
The seawater fatigue cycle simulation test device according to claim 1, characterized in that: the sealing structures of the circulation pressure chamber cylinder (1) and the test chamber cylinder (2) are consistent with the upper end cover (3); The upper opening of the pressure chamber cylinder (1) is an inner concave edge, and the lower surface of the upper end cover (3) is an outer convex surface spliced correspondingly to the inner concave edge. Different surfaces of the splicing joint are passed through second seals respectively. The gasket (26) is sealed, and the upper end cover (3) is provided with a positioning compression block (27). The upper edge of the circulating pressure chamber cylinder (1) cooperates with the positioning compression block (27) upward. Tighten the tightening pin (28).
The seawater fatigue cycle simulation test device according to claim 1, characterized in that: it also includes a gantry (29), and two vertically downward cylinders (31) are provided on the gantry (29). (31) The extended end is connected to the upper end cover (3). The gantry (29), the circulating pressure chamber cylinder (1) and the test chamber cylinder (2) are all equipped with universal wheels (30) at the bottom.
A seawater fatigue cycle simulation test method, characterized in that the seawater fatigue cycle simulation test device according to claim 1 is used and includes the following steps:

S1. Open the upper end cover (3), put the test piece into the test chamber cylinder (1), cover the upper end cover (3), and open the pressure relief needle valve (12) on the upper end cover (3) to the upper end cover. (3) Closely contact the test chamber cylinder (1) to form a seal; turn on the corrosion-resistant pump (24) to input the test liquid into the test chamber cylinder (2), and discharge the air in the test chamber at the same time. After the air is exhausted, turn off the corrosion-resistant pump (24). Pump (24) and pressure relief needle valve (12);

S2. Set the preset pressure P1, critical pressure P0, pressure cycle times n, single pressure holding time t0, pressurization time t1, and unloading time t2 through the control platform (25). The set preset pressure P1 is Set the target pressure value of the fatigue cycle of the test piece, turn on the air compressor (15), adjust the driving pressure regulating valve (16), observe the value of the driving air pressure gauge (17) to ensure that the input gas pressure is the required value, and start the control platform(25);

S3. The control platform (25) controls the solenoid coil of the first solenoid valve (18) to be energized, the gas is input into the gas-liquid booster pump (19), and the water in the water tank (20) is injected into the circulation through the gas-liquid booster pump (19). In the pressure chamber cylinder (1), the pressure in the circulating pressure chamber gradually rises. The pressure passes through the pressure block (6) and is introduced into the test chamber through the pressure guide rod (5) and pressure guide block (7). The real-time pressure is output to the control platform (25) through the pressure sensor (14);

S4. The pressure of the test chamber increases to the preset pressure P1. The control platform (25) controls the first solenoid valve (18) solenoid coil to cut off power, disconnect the fluid circuit, and the test chamber enters the pressure maintaining stage; after the pressure maintaining time reaches t0, The control platform (25) controls the second solenoid valve (21) to open, and the liquid in the circulating pressure chamber flows back to the water tank (20) through the water outlet pipe (11), the throttle valve (23), and the second solenoid valve (21); After the unloading time reaches t2, the pressure in the test chamber drops to the critical value P0, and the control platform (25) controls the second solenoid valve (21) to close;

S5. Repeat steps S3-S4 until the number of test repetitions reaches n, the number of cyclic pressure applications of the control platform (25), end the test and stop the cycle; when the test is completed, control the opening of the second solenoid valve (21) by adjusting the control platform (25) , maintain the unloading state. When the control platform (25) displays that the real-time pressure of the test cabin is 0, the control platform (25) controls the second solenoid valve (21) to close, and opens the pressure relief needle valve (12) to conduct the test inside the test cabin. Release the pressure, open the upper end cover (3), and take out the test piece for observation.