Device for detecting flapping and air tightness of outboard engine valve

Abstract

The invention discloses an outboard engine valve flapping and air tightness detection device, and relates to the technical field of air tightness detection.The outboard engine valve flapping and air tightness detection device comprises a workbench, the right end surface of the workbench is connected with an operation panel through an auxiliary rod in a supporting mode, and the right end surface of a rotating support is connected with a third deep groove ball bearing; a third encoder is arranged at the other end of the third deep groove ball bearing, a rotating bottom plate is arranged between the third diaphragm coupling and the third deep groove ball bearing, a connecting frame is arranged above the rotating bottom plate, an air valve flapping mechanism is installed in the connecting frame, and a tray assembly is installed on the upper surface of the rotating bottom plate. By arranging a series of structures, grinding is stable, the precision is improved, the cost is reduced, meanwhile, a three-axis linkage framework is adopted, the equipment is stable and reliable, the beating and grinding quality is improved, the beating and grinding function and the airtightness detection function are integrated, and operation is more convenient and simpler.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection, in particular to an outboard engine valve flapping and air tightness detection device. Background Art

[0002] In the field of marine engineering, with the continuous development of the shipbuilding industry, outboard motors, as important power equipment for ships, have a performance that directly affects the safety and efficiency of the ship's navigation. As a key component of an outboard engine, the cylinder head's assembly quality and airtightness play a decisive role in the engine's power output, fuel economy, and emission performance. Traditional valve grinding and valve airtightness testing mainly rely on manual operation, which is not only inefficient, but also difficult to ensure the accuracy of airtightness, affecting engine performance. Therefore, it is particularly important to develop an efficient and accurate outboard engine cylinder head valve flapping and valve airtightness testing device. The research and development and application of this outboard engine valve flapping and airtightness testing device are to meet the needs of valve assembly quality, production efficiency, and information management in the outboard motor production process, and have important practical significance and market value.

[0003] With the continuous development of the shipbuilding industry, the market demand for outboard motors is growing, and the performance and quality requirements for outboard motors are also getting higher and higher. Outboard motors of different types and specifications are constantly emerging, which requires valve assembly and testing equipment to be able to adapt to the diverse needs of engine models. Traditional engine cylinder head valve grinding and air tightness testing can no longer meet the needs of modern outboard motor production plants. At the same time, in order to improve production efficiency and reduce production costs, shipbuilding companies have put forward higher requirements for the degree of automation in outboard motor production. Traditional valve grinding and air tightness testing methods can no longer meet the needs of large-scale, high-efficiency, and high-quality production. There is an urgent need for an advanced automated device to achieve valve flapping grinding and air tightness testing. Therefore, a valve flapping and air tightness testing device for outboard motors is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for detecting the flapping and airtightness of an outboard motor valve to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A device for detecting valve flapping and air tightness of an outboard motor, comprising a workbench, the right end surface of the workbench is connected to an operation panel via an auxiliary rod support, an air tightness detector is installed on the upper surface of the operation panel, the rear end surface of the workbench is connected to a power distribution cabinet, the rear end of the upper surface of the workbench is connected to a servo lifting mechanism, the upper surface of the workbench is connected to a rotating bracket, the left end surface of the rotating bracket is connected to a third diaphragm coupling, the end of the third diaphragm coupling away from the rotating bracket is connected to a third angle reducer, and the other end surface of the third angle reducer is connected to a third servo motor, the right end surface of the rotating bracket is connected to a third deep groove ball bearing, and the other end of the third deep groove ball bearing is provided with a third encoder, a rotating base plate is provided between the third diaphragm coupling and the third deep groove ball bearing, a connecting frame is provided above the rotating base plate, a valve flapping mechanism is installed inside the connecting frame, and a tray assembly 39 is installed on the upper surface of the rotating base plate.

[0006] Preferably, the servo lifting mechanism includes a lifting bracket, a buffer, a first guide rail, a first servo motor, a first angle reducer, a first diaphragm coupling, a first cylinder, a first ball screw, a first deep groove ball bearing and a first encoder. The lifting bracket is connected to the upper surface of the workbench, and two buffers are symmetrically installed on the bottom of the front end surface of the lifting bracket. A first guide rail is provided above each of the two buffers. A first servo motor is provided on the top of the lifting bracket, and the output end of the first servo motor is connected to the first angle reducer. The other end of the first angle reducer is connected to the first diaphragm coupling. A first cylinder is provided on one side of the first diaphragm coupling, and the bottom of the first diaphragm coupling is connected to the first ball screw. The bottom of the first ball screw is provided with a first deep groove ball bearing, and a first encoder is provided below the first deep groove ball bearing.

[0007] Preferably, the valve flapping mechanism includes a support plate, a support frame, a camshaft and a telescopic shaft tooling. The support plate is located inside the connecting frame, the support frame is installed on the upper surface of the support plate, a rotating shaft is provided inside the support frame, and a plurality of camshafts are connected to the outer surface of the rotating shaft at equal intervals, a telescopic shaft tooling is provided below the camshaft, and the telescopic shaft tooling is bolted to the upper surface of the support plate.

[0008] Preferably, the bottom of the support plate is connected to a second guide rail, the right end of the support plate is installed with a second angle reducer, the rear end of the second angle reducer is connected to a second diaphragm coupling, the rear end of the second diaphragm coupling is connected to a second ball screw, and the outer surface of the second ball screw is connected to a third guide rail, the rear end of the second ball screw is connected to a second deep groove ball bearing, and the rear end of the second deep groove ball bearing is installed with a second encoder.

[0009] Preferably, a second cylinder is installed at the left end of the support plate, an output end of the second cylinder is connected to a fourth guide rail, and a second servo motor is provided on the rear side of the third guide rail.

[0010] Preferably, a flapping motor is installed on the upper surface of the support frame, the output end of the flapping motor is connected to a synchronous belt via a turntable, and the other end of the synchronous belt is connected to the internal rotating shaft of the support frame via the turntable.

[0011] Preferably, the tray assembly includes a tray base, a bushing and a positioning pin. The tray base is located on the upper surface of the rotating base. The upper surface of the tray base is provided with a bushing. The outer side of the bushing is provided with a positioning pin which is also connected to the upper surface of the tray base.

[0012] Preferably, a circular handle is connected to the right end of the tray bottom plate, and two quick clamps are symmetrically connected to the left and right ends of the upper surface of the tray bottom plate.

[0013] Preferably, a sealing ring is provided at the rear end of the upper surface of the pallet bottom plate, a quick connector is connected to the front end surface of the pallet bottom plate via a preset through hole, and an air intake sealing block is provided at the front end of the upper surface of the pallet bottom plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This outboard motor valve flapping and airtightness testing device integrates valve flapping and airtightness testing functions into one, changing the traditional valve production process where flapping and airtightness testing are performed separately. The traditional method requires separate operations on different devices, which not only increases the equipment footprint but also makes the transfer of valves between different processes time-consuming and labor-intensive. The integrated design of this device allows valve flapping adjustment and airtightness testing to be completed on a single device, significantly improving production efficiency, reducing production space, and lowering the probability of human error caused by process transitions.

[0016] 2. This outboard engine valve flapping and air tightness detection device adopts a mature PLC control system. According to the debugging parameters, it will perform flapping and grinding steps and flapping and grinding time. It also adopts a light sensor to control the angle and displacement to improve the adjustment accuracy. The PLC control system can realize the connection between the intake and exhaust valves, and realize personalized and precise flapping operations. This device is also linked to the factory MES system to remotely monitor and query valve flapping data, collect and store valve flapping data, and can trace flapping and grinding data to realize intelligent operation.

[0017] 3. This outboard motor valve flap and airtightness detection device utilizes advanced airtightness detection technology and features high-precision pressure and flow sensors, capable of detecting even the smallest gas leaks. This significantly improves detection accuracy compared to traditional equipment. Furthermore, the system incorporates a multi-level early warning mechanism. When a valve's airtightness fails to meet standards, an alarm is immediately sounded, with a graded warning based on the severity of the leak. For valves with minor leaks, the system prompts for secondary treatment; for valves with severe leaks, the system directly marks them as defective, enabling operators to take timely action and ensuring consistent product quality.

[0018] 4. This outboard motor valve flap and airtightness test device features comprehensive data recording and analysis capabilities, recording key data such as each valve's flapping parameters and airtightness test results in real time. This data is stored in a database for easy query and traceability. By analyzing this extensive data, it is also possible to identify quality fluctuations during valve production, providing a robust basis for optimizing production processes, improving overall quality and efficiency, and enabling intelligent management of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the servo lifting mechanism of the present invention;

[0021] Figure 3 Schematic diagram of the valve flapping mechanism structure of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the rotating bracket and the rotating base plate of the present invention;

[0023] Figure 5 This is a schematic structural diagram of a tray assembly of the present invention;

[0024] Figure 6 This is an exploded view of the tray assembly of the present invention.

[0025] In the figure: 1. Workbench; 2. Operation panel; 3. Air tightness tester; 4. Power distribution cabinet; 5. Lifting bracket; 6. Buffer; 7. First guide rail; 8. First servo motor; 9. First corner reducer; 10. First diaphragm coupling; 11. First cylinder; 12. First ball screw; 13. First deep groove ball bearing; 14. First encoder; 15. Connecting frame; 16. Support plate; 17. Second guide rail; 18. Second cylinder; 19. Third guide rail; 20. Support frame; 21. Camshaft; 22. Second servo motor; 23. Second corner reducer; 24. Second diaphragm coupling; 25. Second roller Ball screw; 26. Second deep groove ball bearing; 27. Second encoder; 28. Fourth guide rail; 29. ​​Synchronous belt; 30. Flap motor; 31. Telescopic shaft fixture; 32. Rotating bracket; 33. Third diaphragm coupling; 34. Third corner reducer; 35. Third servo motor; 36. Rotating base plate; 37. Third deep groove ball bearing; 38. Third encoder; 39. Tray assembly; 3901. Tray base plate; 3902. Bushing; 3903. Locating pin; 3904. Round handle; 3905. Quick clamp; 3906. Sealing ring; 3907. Quick connector; 3908. Inlet sealing block. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] like Figures 1 to 6As shown, this embodiment is about the outboard engine valve flapping and air tightness detection device, including a workbench 1, the right end surface of the workbench 1 is supported and connected to an operation panel 2 through an auxiliary rod. The workbench 1 serves as the basic structure of the entire device, connecting the flapping machine and the remaining components of the air tightness detection device. It can adjust the horizontal height of the device, carry the start switch and emergency stop switch of the device, and the operation panel 2 provides the user with a model switching operation interface, automated operation, flapping rhythm and quality monitoring functions, and can be connected to the factory MES system to remotely monitor and query valve flapping data, collect and store valve flapping data, and an air tightness detector 3 is installed on the upper surface of the operation panel 2 for controlling and checking the intake and exhaust valve flapping. The sealing performance can be automatically operated. The airtightness detector 3 has high sensitivity and can also be connected to the factory MES system to collect and store valve sealing data for later tracking. The rear end surface of the workbench 1 is connected with a power distribution cabinet 4. The power distribution cabinet 4 provides power for the valve flapping and airtightness detection device, and provides power distribution, automatic control, etc. for the equipment. The rear end of the upper surface of the workbench 1 is connected with a servo lifting mechanism. The servo lifting mechanism provides displacement and support force for the valve flapping mechanism. The PLC system of the operation panel 2 automatically adjusts the height displacement of the valve flapping mechanism for different models. The valve flapping mechanism and the workbench surface 1 are connected for the same model. The upper surface of the workbench 1 is connected with a rotating bracket 32. The left end surface of the bracket 32 ​​is connected to the third diaphragm coupling 33, and the end of the third diaphragm coupling 33 away from the rotating bracket 32 ​​is connected to the third angle reducer 34, and the other end surface of the third angle reducer 34 is connected to the third servo motor 35. The right end surface of the rotating bracket 32 ​​is connected to the third deep groove ball bearing 37, and the other end of the third deep groove ball bearing 37 is provided with a third encoder 38. A rotating base plate 36 is provided between the third diaphragm coupling 33 and the third deep groove ball bearing 37, and a connecting frame 15 is provided above the rotating base plate 36. The servo angle rotation mechanism is formed by the combination of relevant components, and the engine cylinder is operated in the air flow by using the rotating bracket 32 ​​and other components. During the tightness test, the cylinder head can be rotated by a certain angle, and the intake valve and exhaust valve of the cylinder head can be coaxial with the valve flapping telescopic shaft tooling 31 of the valve flapping mechanism. The intake and exhaust valve flapping sequence can also be rotated according to the system regulations to provide support for the valve flapping mechanism. The valve flapping mechanism is installed inside the connecting frame 15, which is the main working part of the cylinder head valve grinding. The valve and the valve seat ring are rubbed against each other through the valve flapping telescopic shaft tooling 31 to form a line contact to achieve a sealing effect. The upper surface of the rotating base plate 36 is installed with a tray assembly 39. The tray assembly 39 provides support for the valve flapping mechanism and feeds back the test results to the air tightness tester 3.

[0029] Specifically, the servo lifting mechanism includes a lifting bracket 5, a buffer 6, a first guide rail 7, a first servo motor 8, a first corner reducer 9, a first diaphragm coupling 10, a first cylinder 11, a first ball screw 12, a first deep groove ball bearing 13 and a first encoder 14. The lifting bracket 5 is connected to the upper surface of the workbench 1. Two buffers 6 are symmetrically installed on the bottom of the front end surface of the lifting bracket 5. The first guide rail 7 is provided above the two buffers 6. The top of the lifting bracket 5 is provided with a first servo motor 8. The output end of the first servo motor 8 is connected to the first corner reducer 9. The first corner reducer The other end of 9 is connected to the first diaphragm coupling 10, and a first cylinder 11 is provided on one side of the first diaphragm coupling 10. The bottom of the first diaphragm coupling 10 is connected to the first ball screw 12, and the bottom of the first ball screw 12 is provided with a first deep groove ball bearing 13. A first encoder 14 is provided below the first deep groove ball bearing 13. The first servo motor 8 drives the first ball screw 12, and transmits power through the first diaphragm coupling 10 to drive the lifting bracket 5 to move along the first guide rail 7. The buffer 6 plays a stabilizing and protective role. The first encoder 14 provides real-time feedback of the rotation angle to ensure the accuracy of the height adjustment.

[0030] Furthermore, the valve flapping mechanism includes a support plate 16, a support frame 20, a camshaft 21 and a telescopic shaft tooling 31. The support plate 16 is located inside the connecting frame 15. The support frame 20 is installed on the upper surface of the support plate 16. A rotating shaft is provided inside the support frame 20, and a plurality of camshafts 21 are connected to the outer surface of the rotating shaft at equal intervals. A telescopic shaft tooling 31 is provided below the camshaft 21, and the telescopic shaft tooling 31 is bolted to the upper surface of the support plate 16.

[0031] Furthermore, the bottom of the support plate 16 is connected to the second guide rail 17, the right end of the support plate 16 is installed with a second corner reducer 23, the rear end of the second corner reducer 23 is connected to the second diaphragm coupling 24, the rear end of the second diaphragm coupling 24 is connected to the second ball screw 25, and the outer surface of the second ball screw 25 is connected to the fourth guide rail 28, the rear end of the second ball screw 25 is connected to the second deep groove ball bearing 26, and the rear end of the second deep groove ball bearing 26 is installed with a second encoder 27.

[0032] Furthermore, a second cylinder 18 is installed at the left end of the supporting plate 16 , an output end of the second cylinder 18 is connected to a third guide rail 19 , and a second servo motor 22 is provided at the rear side of the third guide rail 19 .

[0033] Furthermore, a flapping motor 30 is installed on the upper surface of the support frame 20. The output end of the flapping motor 30 is connected to a synchronous belt 29 through a turntable. The other end of the synchronous belt 29 is connected to the internal rotating shaft of the support frame 20 through a turntable. During the valve flapping and grinding working stage, the flapping motor 30 is started to drive the camshaft 21 to rotate. The camshaft 21 drives the telescopic shaft tooling 31 to make the valve and the valve seat ring rub against each other. Through continuous flapping, they form line contact, thereby achieving a sealing effect.

[0034] Furthermore, the tray assembly 39 includes a tray base plate 3901, a bushing 3902 and a positioning pin 3903. The tray base plate 3901 is located on the upper surface of the rotating base plate 36. The upper surface of the tray base plate 3901 is provided with a bushing 3902. The outer side of the bushing 3902 is provided with a positioning pin 3903 which is also connected to the upper surface of the tray base plate 3901. The positioning pin 3903 is used to position the engine cylinder and the tray base plate 3901.

[0035] Furthermore, a circular handle 3904 is connected to the right end of the tray base plate 3901, and two quick clamps 3905 are symmetrically connected to the left and right ends of the upper surface of the tray base plate 3901. The engine cylinder can be quickly clamped by the quick clamps 3905.

[0036] Furthermore, a sealing ring 3906 is provided at the rear end of the upper surface of the tray base plate 3901, a quick connector 3907 is connected to the front end surface of the tray base plate 3901 through a preset through hole, and an air intake sealing block 3908 is provided at the front of the upper surface of the tray base plate 3901. The sealing ring 3906 and the air intake sealing block 3908 ensure the sealing effect.

[0037] The method of using this embodiment is as follows: activate the power distribution cabinet 4, operating panel 2, and airtightness tester 3. Adjust the operating panel 2 and airtightness tester 3 to the corresponding model of the machine to be tested. Install the valve flapping shaft fixture corresponding to the machine model onto the valve flapping mechanism. Simultaneously, replace the corresponding tray base plate 3901 onto the rotating bracket 32. Mount the cylinder head to be flapped, ground, and airtightness tested on the tray base plate 3901, and install the airtightness test fixture on the cylinder head. The servo lift mechanism operates according to the instructions of the PLC system on the operating panel 2. The system automatically adjusts the height displacement of the valve flapping mechanism for the corresponding machine model. The first servo motor 8 drives the first ball screw 12, which transmits power through the first diaphragm coupling 10, driving the lift bracket 5 along the first guide rail 7. The buffer 6 provides stability and protection, and the first encoder 14 provides real-time feedback on the rotation angle to ensure accurate height adjustment. The rotating bracket 32 ​​rotates the cylinder head's intake and exhaust valves to the appropriate angle, preparing for valve flapping. The third servo motor 35 controls the rotation of the rotating bracket 32, providing accurate angular displacement for the valve flapping mechanism. During the valve flapping and grinding phase, the flapping motor 30 is activated, driving the camshaft 21 to rotate. The camshaft 21 drives the telescopic shaft tooling 31, causing the valve and valve seat to rub against each other. Through continuous flapping, they form a line contact, thus achieving a sealing effect. According to the program of the operating panel 2, the cylinder head intake and exhaust valves are flapped and ground. The flapping sequence is transmitted, and the cylinder head tray and flapping sequence are rotated according to the instructions. The operating panel 2 has already programmed the flapping tooling time and sequence in the system; the operating panel 2 also monitors the flapping rhythm and quality. During the valve tightness test phase, after the valve tapping and lapping process is complete, the air tightness tester 3 automatically activates and begins operating. Air is introduced into the cylinder head via the quick connector 3907 to test the post-valve sealing. This highly sensitive, automated tester accurately detects valve leaks. The test results are fed back to the air tightness tester 3, which is then connected to the factory's MES system to collect and store valve tightness data for later tracking. After the valve tapping and air tightness test are complete, the equipment stops operating, and the operator removes the valve tapped cylinder head and replaces it with a new one for valve tapping, lapping, and air tightness testing.

[0038] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A device for detecting the flapping and airtightness of an outboard engine valve, comprising a workbench (1), characterized in that: The right end surface of the workbench (1) is connected to an operation panel (2) through an auxiliary rod support, an airtightness detector (3) is installed on the upper surface of the operation panel (2), a power distribution cabinet (4) is connected to the rear end surface of the workbench (1), a servo lifting mechanism is connected to the rear end of the upper surface of the workbench (1), a rotating bracket (32) is connected to the upper surface of the workbench (1), a third diaphragm coupling (33) is connected to the left end surface of the rotating bracket (32), and a third angle reducer (34) is connected to the end of the third diaphragm coupling (33) away from the rotating bracket (32), and The other end surface of the third angle reducer (34) is connected to a third servo motor (35), the right end surface of the rotating bracket (32) is connected to a third deep groove ball bearing (37), and the other end of the third deep groove ball bearing (37) is provided with a third encoder (38), a rotating base plate (36) is provided between the third diaphragm coupling (33) and the third deep groove ball bearing (37), a connecting frame (15) is provided above the rotating base plate (36), a valve flapping mechanism is installed inside the connecting frame (15), and a tray assembly 39 is installed on the upper surface of the rotating base plate (36).

2. The outboard engine valve flapping and airtightness detection device according to claim 1, characterized in that: The servo lifting mechanism comprises a lifting bracket (5), a buffer (6), a first guide rail (7), a first servo motor (8), a first angle reducer (9), a first diaphragm coupling (10), a first cylinder (11), a first ball screw (12), a first deep groove ball bearing (13) and a first encoder (14), wherein the lifting bracket (5) is connected to the upper surface of the workbench (1), two buffers (6) are symmetrically installed on the bottom of the front end surface of the lifting bracket (5), and the first guide rail (7) is arranged above the two buffers (6), and the lifting bracket ( 5), a first servo motor (8) is provided on the top of the first servo motor (8), an output end of the first servo motor (8) is connected to a first angular reducer (9), the other end of the first angular reducer (9) is connected to a first diaphragm coupling (10), a first cylinder (11) is provided on one side of the first diaphragm coupling (10), a first ball screw (12) is connected to the bottom of the first diaphragm coupling (10), a first deep groove ball bearing (13) is provided at the bottom of the first ball screw (12), and a first encoder (14) is provided below the first deep groove ball bearing (13).

3. The outboard engine valve flapping and airtightness detection device according to claim 1, characterized in that: The valve flapping mechanism comprises a support plate (16), a support frame (20), a camshaft (21) and a telescopic shaft fixture (31); the support plate (16) is located inside the connecting frame (15); the support frame (20) is installed on the upper surface of the support plate (16); a rotating shaft is provided inside the support frame (20); and a plurality of camshafts (21) are connected to the outer surface of the rotating shaft at equal intervals; a telescopic shaft fixture (31) is provided below the camshaft (21), and the telescopic shaft fixture (31) is bolted to the upper surface of the support plate (16).

4. The outboard engine valve flapping and airtightness detection device according to claim 3, characterized in that: The bottom of the support plate (16) is connected to a second guide rail (17), the right end of the support plate (16) is installed with a second angle reducer (23), the rear end of the second angle reducer (23) is connected to a second diaphragm coupling (24), the rear end of the second diaphragm coupling (24) is connected to a second ball screw (25), and the outer surface of the second ball screw (25) is connected to a fourth guide rail (28), the rear end of the second ball screw (25) is connected to a second deep groove ball bearing (26), and the rear end of the second deep groove ball bearing (26) is installed with a second encoder (27).

5. The outboard engine valve flapping and airtightness detection device according to claim 3, characterized in that: A second cylinder (18) is installed at the left end of the support plate (16), an output end of the second cylinder (18) is connected to a third guide rail (19), and a second servo motor (22) is provided at the rear side of the third guide rail (19).

6. The outboard engine valve flapping and airtightness detection device according to claim 3, characterized in that: A flapping motor (30) is installed on the upper surface of the support frame (20), and the output end of the flapping motor (30) is connected to a synchronous belt (29) through a turntable, and the other end of the synchronous belt (29) is connected to the internal rotating shaft of the support frame (20) through the turntable.

7. The outboard engine valve flapping and airtightness detection device according to claim 1, characterized in that: The tray assembly (39) includes a tray base plate (3901), a bushing (3902) and a positioning pin (3903). The tray base plate (3901) is located on the upper surface of the rotating base plate (36). The upper surface of the tray base plate (3901) is provided with a bushing (3902). The outer side of the bushing (3902) is provided with a positioning pin (3903) which is also connected to the upper surface of the tray base plate (3901).

8. The outboard engine valve flapping and airtightness detection device according to claim 7, characterized in that: The right end of the tray bottom plate (3901) is connected to a circular handle (3904), and two quick clamps (3905) are symmetrically connected to the left and right ends of the upper surface of the tray bottom plate (3901).

9. The outboard engine valve flapping and airtightness detection device according to claim 7, characterized in that: A sealing ring (3906) is provided at the rear end of the upper surface of the tray base plate (3901), a quick connector (3907) is connected to the front end surface of the tray base plate (3901) via a preset through hole, and an air intake sealing block (3908) is provided at the front end of the upper surface of the tray base plate (3901).

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