Marine diesel engine shock resistance test device and use method

Abstract

The invention discloses an impact resistance test device for a marine diesel engine. The impact resistance test device comprises an impact resistance test bed, the upper end of the shock resistance test bench is connected with the test base; a plurality of vibration isolators are mounted on the test base, and anti-impact machine legs, fixedly connected with the bottom of a diesel engine, at the upper ends of the vibration isolators are connected with an impact hammer and are arranged on the outer side of the impact test bed for impacting the impact test bed; the data acquisition instrument is in circuit connection with the upper computer; and the data acquisition instrument is in circuit connection with an ECU (Electronic Control Unit) of the diesel engine, the external fuel pump and the pneumatic motor. The impact force borne by the diesel engine in the operation state when a ship is subjected to explosion impact is simulated on the land, and the working performance of the diesel engine can be detected when the diesel engine is subjected to impact resistance. And accessory equipment connected with the diesel engine is not arranged on the test bed and is flexibly connected with the diesel engine, so that the reliability is high, the device can be repeatedly used, and the test cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of marine diesel engines, and in particular relates to a marine diesel engine anti-impact test device and a use method thereof. Background Art

[0002] Certain ship equipment requires a certain degree of impact resistance. Impact resistance design is the basis of the impact resistance design of ship equipment and systems, which is mainly manifested in the impact acceleration, velocity and displacement under the action of underwater explosion loads. Diesel engines are important sources of power and electricity for ship equipment, so they naturally need to have a certain degree of impact resistance. Such diesel engines need to undergo impact resistance tests when finalizing their products. In the prior art, there is a lack of special test equipment on land to simulate the test device for the impact resistance of diesel engines when ships are subjected to explosion shocks. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a marine diesel engine anti-shock test device, the purpose of which is to conduct an anti-shock test on an impact test bench, using an impact hammer to hit the test bench to simulate the state of a ship when it is subjected to an explosion shock, and then detect the performance of the diesel engine when it is subjected to shock. The anti-shock test bench is different from the traditional bench test device. It requires that related auxiliary equipment cannot be placed on the test bench during the diesel engine motion state test, and a dedicated auxiliary equipment system must be designed to ensure that the diesel engine can operate stably on the anti-shock test bench.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a marine diesel engine impact test device, comprising an impact test bench; the upper end of the impact test bench is connected to a test base; a plurality of vibration isolators are installed on the test base, the upper end of the vibration isolator is connected to an impact-resistant machine foot fixedly connected to the bottom of the diesel engine, and the diesel engine is installed on the upper end of the impact test bench through a vibration reduction device; an impact hammer is arranged on the outside of the impact test bench, and is used to impact the impact test bench; the fuel tank of the diesel engine is arranged on the outside of the impact test bench, and is connected to the high-pressure oil pump of the diesel engine through a fuel hose; an external A fuel pump is installed; the diesel engine exhaust port is connected to a high-temperature resistant hose, and the end of the high-temperature resistant hose is connected to an iron bell mouth; the seawater hose connected to the high-level seawater tank outside the impact test bench is connected to the seawater pump provided by the diesel engine, and the seawater return hose connected to the high-level seawater tank is connected to the return port of the diesel engine; the air compressor located outside the impact test bench is connected to the air motor provided by the diesel engine through a high-pressure resistant hose, and the air motor is connected to the flywheel transmission of the diesel engine; it also includes a data acquisition instrument connected to the upper computer circuit; the data acquisition instrument is connected to the ECU of the diesel engine, the external fuel pump and the air motor circuit.

[0005] As a further optimization, the high-pressure hose between the air compressor and the air motor is also connected to an air storage tank, and the air storage tank is provided with a pressure sensor I and a temperature sensor I both connected to the data acquisition instrument circuit.

[0006] As a further optimization, the fuel tank is provided with a liquid level gauge I, a pressure sensor II, and a temperature sensor II, and the pressure sensor II and the temperature sensor II are both connected to the data acquisition circuit; a fuel valve and a fuel filter are sequentially provided on the fuel hose between the external fuel pump and the high-pressure fuel pump.

[0007] As a further optimization, the high-level seawater tank is provided with a liquid level gauge II, a pressure sensor III, and a temperature sensor III; the pressure sensor III and the temperature sensor III are both connected to the data acquisition instrument circuit; and a water valve is provided on the seawater hose.

[0008] The present invention also provides a method for using a marine diesel engine anti-shock test device, using the marine diesel engine anti-shock test device as described above, comprising the following steps:

[0009] S1: Start the diesel engine; the air compressor starts, the host computer sends a start command signal to the air motor, and the air motor drives the flywheel to rotate; at the same time, the host computer sends a control signal to control the external fuel pump to start supplying fuel to the diesel engine until the diesel engine ignites and starts;

[0010] S2: Turn off the air motor; after step S1, after the host computer detects that the diesel engine starts normally through the ECU, the host computer sends a control signal to control the air motor to turn off;

[0011] S3: starting the impact hammer; when the diesel engine is operating normally, the impact hammer hits the impact test bench to simulate the impact acceleration, velocity and displacement required for underwater explosion;

[0012] S4: Detection parameters: the host computer monitors various performance parameters of the diesel engine collected from the ECU through the data acquisition instrument.

[0013] Compared with the prior art, the invention has the following beneficial effects: the invention simulates the impact force of a diesel engine in operation when a ship is subjected to an explosion on land, and can detect the working performance of the diesel engine when subjected to an impact. The auxiliary equipment connected to the diesel engine is not on the test bench, and is softly connected to the diesel engine, which has high reliability, can be reused, and reduces the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention.

[0015] In the figure: 1. diesel engine, 2. impact-resistant machine foot, 3. vibration isolator, 4. test base, 5. impact-resistant test bench, 6. impact hammer, 7. ECU, 8. air compressor, 9. air storage tank, 10. pressure sensor I, 11. temperature sensor I, 12. high-pressure hose, 13. air motor, 14. fuel tank, 15. pressure sensor II, 16. temperature sensor II, 17. external fuel pump, 18. fuel valve, 19. fuel filter, 20. fuel hose, 21. high-pressure oil pump, 22. high-level seawater tank, 23. pressure sensor III, 24. temperature sensor III, 25. water valve, 26. seawater hose, 27. seawater pump, 28. high-temperature hose, 29. iron bell mouth, 30. data acquisition instrument, 31. host computer, 32. flywheel, 33. seawater return hose, 34. liquid level gauge I, 35. liquid level gauge II. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] See also Figure 1 The present invention is a device and method for testing the impact resistance of a marine diesel engine in operation. Figure 1 As shown: the diesel engine 1 is connected to the impact test bench 5 through the impact-resistant machine foot 2, the vibration isolator 3, and the test base 4; the impact direction applied by the impact hammer 6 is generally horizontal, longitudinal and vertical, and the impact acceleration, velocity and displacement energy required by the impact test bench are generated by hitting the impact test bench 5, and are transmitted and attenuated to the impact acceleration, velocity and displacement values ​​required by the impact-resistant machine foot 2 of the diesel engine 1 through the test base 4 and the vibration isolator 3; the impact test is divided into a diesel engine 1 static state test and a diesel engine 1 running test, and the ECU 7 installed on the diesel engine 1 is used to control the operation of the diesel engine 1, and at the same time transmit the relevant data of the diesel engine 1 to the data acquisition instrument 30, and the host computer 31 reprocesses and analyzes the data, and at the same time sends relevant control signals through the data acquisition instrument 30.

[0018] The air compressor 8 receives the start instruction from the host computer 31 through the data acquisition system 30, and starts to fill the compressed air into the air tank 9. The data acquisition instrument 30 monitors the pressure sensor Ⅰ10 and the temperature sensor Ⅰ11 to detect the pressure and temperature changes in the air tank 9 in real time. When the pressure and temperature in the air tank 9 meet the requirements, the host computer 31 issues an instruction through the data acquisition instrument 30 to stop the air compressor 8; the air motor 13 receives the start instruction from the host computer 31 through the data acquisition system 30, consumes the compressed air in the air tank 9 to drive the flywheel 32 to rotate, and accelerates the diesel engine 1 from a stationary state to the ignition speed, until the diesel engine 1 can run at idle speed by itself. The high-pressure hose 12 connects the air tank 9 and the air motor 13, provides compressed air to the air motor 13, and at the same time facilitates the arrangement of the air compressor 8 and the air tank 9 on the periphery of the impact test bench 5 without affecting the normal operation of the impact test bench 5.

[0019] The fuel required for the operation of the high-pressure fuel pump 21 of the fuel system enters through the fuel tank 14, the external fuel pump 17, the fuel valve 18, the fuel filter 19 and the fuel hose 20; the fuel tank 14 stores fuel and is equipped with a pressure sensor II 15, a temperature sensor II 16 and a liquid level gauge I 34; the liquid level gauge I 34 is used to observe the fuel level in the fuel tank 22, and is convenient for direct observation and replenishment of fuel when the fuel is too little; the pressure sensor II 15 is used to monitor the pressure change of the fuel in the fuel tank 14; the temperature sensor I 16 is used to monitor the temperature of the fuel in the fuel tank 14. The external fuel pump 17 draws fuel from the fuel tank 14 and pumps fuel into the high-pressure fuel pump 21, and keeps a certain pressure in the fuel hose 20 at the front end of the high-pressure fuel pump 21 to ensure the normal operation of the high-pressure fuel pump 21. The fuel valve 18 controls the fuel supply and closing of the fuel system pipeline, opens before the test, and closes after the test. The fuel filter 19 is used to filter impurities in the fuel so that clean fuel enters the high-pressure fuel pump 21. The high-pressure fuel pump 21 provides high-pressure fuel for the diesel engine 1 to start smoothly, and the high-pressure fuel pump 21 is controlled by the ECU 7. The fuel hose 20 delivers fuel to the high-pressure fuel pump 21. At the same time, the fuel tank 14, the external fuel pump 17, the fuel valve 18, and the fuel filter 19 are arranged on the periphery of the impact test bench 5, which does not affect the normal operation of the impact test bench 5. The data acquisition instrument 31 monitors the data of the pressure sensor Ⅱ15 and the temperature sensor Ⅱ16 of the fuel on the fuel tank 14, and transmits the control signal of the external fuel pump 17 of the host computer 31.

[0020] The seawater cooling water required by the seawater pump 27 passes through the high-level water tank 22, the water valve 25 and the seawater hose 26, and then returns to the seawater tank through the seawater return hose 33 after the diesel engine is cooled; the high-level seawater tank 22 is to store the seawater required for the impact test, and its cooling water outlet position is the high-pressure diesel engine 1, the high-level seawater tank 22 outlet position is located below the seawater tank, and the return water position is located above the high-level seawater tank 22, and the high-level seawater tank 22 outlet position is installed with a water valve 25, and the high-level water tank 22 is installed with a pressure sensor III 23, a temperature sensor III 24 and a liquid level gauge II 35; the pressure sensor III 23 is used to monitor the seawater in the high-level water tank 22 The water pressure changes; the temperature sensor III 24 is used to monitor the temperature changes of the seawater in the high-level water tank 22; the liquid level gauge II 35 is used to observe the seawater level in the high-level seawater tank 22; the water valve 25 is used to control the supply and shutdown of the seawater system, and the seawater valve 25 is connected to the seawater pump 27 by a seawater hose 26; the seawater pump 27 provides seawater for the diesel engine 1 to cool the various components of the diesel engine 1; the seawater return hose 33 is used to return the seawater after the diesel engine 1 is cooled to the high-level seawater tank 22; the data acquisition instrument 30 monitors the pressure sensor II 23 and temperature sensor II 24 data of the seawater in the high-level seawater tank 22.

[0021] The exhaust gas of the exhaust system is discharged through the high temperature resistant hose 28 and the iron bell mouth 29: the high temperature resistant hose 28 guides the exhaust gas generated during the impact test of the diesel engine 1 to avoid polluting the impact test workshop, and finally guides it out through the iron bell mouth 29; the bell mouth 29 is a trumpet structure, which is convenient for the exhaust gas to flow out in a diffused state.

[0022] A shock resistance test supporting device and test method for a marine diesel engine in operation, the test method comprising: opening a fuel valve 18 and a water valve 25 before the test; observing the fuel level through a liquid level gauge Ⅰ34 on the fuel tank 14, and replenishing the fuel when the requirements are not met; observing the seawater level through a liquid level gauge Ⅱ35 on a high-level water tank 22, and replenishing the seawater when the requirements are met; observing the data of a pressure sensor Ⅰ10 and a temperature sensor Ⅰ11 on an air storage tank 9 through a host computer 31 and a data acquisition instrument 30 to see whether the temperature and pressure of the compressed air meet the requirements, and if not, giving an instruction to turn on an air compressor 8, injecting compressed air into the air storage tank 9, observing the data of a pressure sensor Ⅰ10 and a temperature sensor Ⅰ11 on the air storage tank 9, and when the pressure and temperature meet the requirements, giving an instruction to turn off the air compressor 8 through the host computer 31; 31 and the data acquisition instrument 30 observe the data of the pressure sensor II 15 and the temperature sensor II 16 on the fuel tank 14 and the data of the pressure sensor III 23 and the temperature sensor III 24 on the high-level water tank 22, and process them in real time when the requirements are not met; when the diesel engine 1 is started, the upper computer 31 issues a start command through the data acquisition instrument 30, and simultaneously turns on the air motor 13 and the fuel pump 17, controls ECU7, and issues a command to the high-pressure oil pump 21 to start supplying fuel until the start is successful; after the start is successful, the exhaust gas is discharged through the high-temperature resistant hose 28 and the iron bell mouth 29; after the diesel engine 1 runs stably, the impact hammer 6 hits the impact test bench 5 to generate the required impact acceleration, velocity and displacement data, and observes the various performance parameters of the diesel engine 1 collected from ECU7 through the upper computer 31 and the data acquisition instrument 30, and makes timely adjustments.

[0023] A shock resistance test supporting device and test method for a marine diesel engine in operation. The test method is as follows: when the engine is stopped, the upper computer 31 sends a command from the data acquisition instrument 30, and the ECU 7 controls the high-pressure oil pump to stop supplying oil, and the external fuel pump 17 stops working. At this time, the diesel engine 1 automatically stops in the case of lack of fuel, and then the fuel valve 18 and the water valve 25 are manually closed to cut off the fuel and seawater supply systems.

[0024] It can be seen that the impact test device for a marine diesel engine of the present invention at least comprises an impact test bench 5; the upper end of the impact test bench 5 is connected to a test base 4; a plurality of vibration isolators 3 are installed on the test base 4, and the upper end of the vibration isolator 3 is connected to an impact-resistant machine foot 2 fixedly connected to the bottom of the diesel engine 1, so that the diesel engine 1 is installed on the upper end of the impact test bench 5 through a vibration reduction device; an impact hammer 6 is arranged on the outside of the impact test bench 5, and is used to impact the impact test bench 5; the fuel tank 14 of the diesel engine 1 is arranged on the outside of the impact test bench 5, and is connected to the high-pressure oil pump 21 of the diesel engine 1 through a fuel hose 20; an external fuel pump 17 is provided on the fuel hose 20; the exhaust gas of the diesel engine 1 The outlet is connected to a high-temperature resistant hose 28, and the end of the high-temperature resistant hose 28 is connected to an iron bell mouth 29; the seawater hose 26 connected to the high-level seawater tank 22 located outside the impact test bench 5 is connected to the seawater pump 27 provided by the diesel engine 1, and the seawater return hose 33 connected to the high-level seawater tank 22 is connected to the return port of the diesel engine; the air compressor 8 located outside the impact test bench 5 is connected to the air motor 13 provided by the diesel engine 1 through the high-pressure resistant hose 12, and the air motor 13 is transmission-connected to the flywheel 32 of the diesel engine 1; it also includes a data acquisition instrument 30 connected to the upper computer 31 circuit; the data acquisition instrument 30 is connected to the ECU7 of the diesel engine 1, the external fuel pump 17 and the air motor 13 circuit.

[0025] When used, the following steps are included.

[0026] S1: Start the diesel engine 1; the air compressor 8 is started, the upper computer 31 sends a start command signal to the air motor 13, and the air motor 13 drives the flywheel 32 to rotate; at the same time, the upper computer 1 sends a control signal to control the external fuel pump 17 to start supplying fuel to the diesel engine 1 until the diesel engine 1 ignites and starts;

[0027] S2: Turn off the air motor 13; after step S1, the host computer 31 detects through the ECU 7 that the diesel engine 1 is started normally, and the host computer 1 sends a control signal to control the air motor 13 to turn off;

[0028] S3: Start the impact hammer 6; when the diesel engine 1 is operating normally, the impact hammer 6 hits the impact test bench 5 to simulate the impact acceleration, velocity and displacement required for the underwater explosion;

[0029] S4: Detect parameters, and monitor various performance parameters of the diesel engine 1 collected from the ECU 7 through the host computer 31 through the data acquisition device 30.

[0030] Therefore, this embodiment simulates the impact force of the diesel engine in operation when the ship is subjected to explosion impact on land, and can detect the working performance of the diesel engine when subjected to impact. The auxiliary equipment connected to the diesel engine is not on the test bench, and is softly connected to the diesel engine, which has high reliability and can be reused after replacing the diesel engine, reducing the test cost.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A marine diesel engine shock resistance test device, comprising a shock resistance test bench (5); characterized in that: The upper end of the impact resistance test bench (5) is connected to a test base (4); a plurality of vibration isolators (3) are installed on the test base (4); the upper ends of the vibration isolators (3) are connected to an impact resistance machine foot (2) fixedly connected to the bottom of the diesel engine (1); An impact hammer (6) is arranged outside the impact test bench (5) and is used to impact the impact test bench (5); The fuel tank (14) of the diesel engine (1) is arranged outside the impact test bench (5) and connected to the high-pressure oil pump (21) of the diesel engine (1) through a fuel hose (20); an external fuel pump (17) is arranged on the fuel hose (20); the exhaust port of the diesel engine (1) is connected to a high-temperature resistant hose (28), and the end of the high-temperature resistant hose (28) is connected to an iron bell mouth (29); the seawater hose (26) connected to the high-level seawater tank (22) outside the impact test bench (5) is connected to the seawater pump (27) of the diesel engine (1), and the seawater return hose (33) connected to the high-level seawater tank (22) is connected to the return port of the diesel engine; the air compressor (8) located outside the impact test bench (5) is connected to the air motor (13) of the diesel engine (1) through a high-pressure resistant hose (12), and the air motor (13) is drivingly connected to the flywheel (32) of the diesel engine (1); It also includes a data acquisition device (30) connected to the upper computer (31) in circuit; the data acquisition device (30) is connected to the ECU (7) of the diesel engine (1), the external fuel pump (17) and the air motor (13) in circuit.

2. The marine diesel engine anti-shock test device according to claim 1, characterized in that: The high-pressure hose (12) between the air compressor (8) and the air motor (17) is also connected to an air storage tank (9), and the air storage tank (9) is provided with a pressure sensor I (10) and a temperature sensor I (11) both of which are connected to the circuit of the data acquisition instrument (30).

3. The marine diesel engine anti-shock test device according to claim 1, characterized in that: The fuel tank (14) is provided with a liquid level gauge I (34), a pressure sensor II (15), and a temperature sensor II (16), and the pressure sensor II (15) and the temperature sensor II (16) are both connected to the circuit of the data acquisition instrument (30); a fuel valve (18) and a fuel filter (19) are sequentially provided on the fuel hose (20) between the external fuel pump (17) and the high-pressure fuel pump (21).

4. The marine diesel engine anti-shock test device according to claim 1, characterized in that: The high-level seawater tank (22) is provided with a liquid level meter II (35), a pressure sensor III (23), and a temperature sensor III (24); the pressure sensor III (23) and the temperature sensor III (24) are both connected to the circuit of the data acquisition instrument (30); and a water valve (25) is provided on the seawater hose (26).

5. A method for using a marine diesel engine impact test device, characterized in that: The marine diesel engine anti-shock test device according to any one of claims 1 to 4 comprises the following steps: S1: Start the diesel engine (1); the air compressor (8) starts, the upper computer (31) sends a start command signal to the air motor (13), and the air motor (13) drives the flywheel (32) to rotate; at the same time, the upper computer (1) sends a control signal to control the external fuel pump (17) to start supplying fuel to the diesel engine (1), until the diesel engine (1) ignites and starts; S2: Turning off the air motor (13); after step S1, the host computer (31) detects through the ECU (7) that the diesel engine (1) is started normally, and then the host computer (1) sends a control signal to control the air motor (13) to turn off; S3: starting the impact hammer (6); when the diesel engine (1) is operating normally, the impact hammer (6) strikes the impact test bench (5) to simulate the impact acceleration, velocity and displacement required for underwater explosion; S4: Detecting parameters, the host computer (31) monitors various performance parameters of the diesel engine (1) collected from the ECU (7) through the data acquisition device (30).

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