A sealing detection process for a metal bellows coupling

Abstract

A kind of sealing detection process of metal bellows coupling, the actual working condition of rail transit coupling with metal bellows is simulated, and the dynamic sealing detection of coupling is carried out. It includes the following steps: (1-1), the rail transit coupling is installed between the driving spindle and the input shaft of gear box;(1-2), inject sufficient lubricating oil into the coupling;(2-1), drive the driving spindle to rotate through the coupling to drive the input shaft of gear box to rotate;(2-2), apply radial load Fr to the input shaft of gear box;(2-3), change the direction and size of radial load Fr applied to the input shaft of gear box;(2-4), apply axial load Fa to the input shaft of gear box;(2-5), change the direction and size of axial load Fa applied to the input shaft of gear box;(3-1), brake the driving spindle, and observe whether leakage occurs.The application simulates the working condition of coupling to dynamically detect the sealing, and the detection is real and high in precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coupling seal detection, in particular to a seal detection process for a coupling with a metal bellows. BACKGROUND

[0002] A coupling, also known as a coupling joint, is a mechanical component used to firmly connect the driving shaft and the driven shaft in different mechanisms to rotate together and transmit motion and torque. An O-ring is arranged at the connection between the inner and outer teeth of the coupling and the metal bellows. The working conditions of the coupling for rail transit are relatively complex. Due to the unevenness of the rail assembly in the height direction and the variability of the rail shape, the coupling frequently changes in axial and radial displacement during the working process. A gap is generated at the connection between the inner and outer teeth of the coupling and the metal bellows, which causes the deformation of the sealing ring and the leakage of lubricating oil. When detecting the sealing performance of such a coupling, a gas negative pressure detection method is adopted. However, the gas negative pressure detection method has the following problems: the sealing defects cannot be detected during the negative pressure detection process, and the leakage of lubricating oil occurs after the coupling is loaded. The reason for the above problems is that the coupling is in a non-working state (i.e., a static state) when the sealing performance of the coupling is detected by the gas negative pressure detection method, which is static detection. The actual working condition of the coupling is high-speed dynamic oscillation. Under the action of liquid oil and high-speed rotating centrifugal force, the O-ring is always in a state of extrusion deformation. Therefore, the sealing defects of the coupling are not exposed by the static detection method, which makes the sealing detection not true and fails to reflect the true condition of the coupling. SUMMARY

[0003] The purpose of the present application is to provide a seal detection process for a coupling with a metal bellows, which simulates the actual working condition of the coupling for rail transit with a metal bellows and performs dynamic sealing detection on the coupling.

[0004] The technical solution adopted by the present application to solve the technical problem is a seal detection process for a coupling with a metal bellows, comprising the following steps:

[0005] I. Coupling assembly

[0006] 1-1. Install the coupling for rail transit between the driving main shaft and the gear box input shaft.

[0007] 1-2. Inject a sufficient amount of lubricating oil into the coupling, and close the oil injection hole after the oil injection is completed.

[0008] II. Coupling rotation driving

[0009] 2-1. Drive the driving main shaft to rotate and drive the gear box input shaft to rotate through the coupling. In this process, the speed of the driving main shaft is adjusted, and this step lasts for 2-4 minutes.

[0010] 2-2, apply a radial load Fr to the input shaft of the gear box, and change the size of the radial load Fr to adjust the amount of radial displacement of the input shaft of the gear box, which lasts for 1-2 minutes.

[0011] 2-3, change the direction and size of the radial load Fr applied to the input shaft of the gear box, which lasts for 1-2 minutes.

[0012] 2-4, apply an axial load Fa to the input shaft of the gear box, and change the size of the axial load Fa to adjust the amount of axial displacement of the input shaft of the gear box, which lasts for 1-2 minutes.

[0013] 2-5, change the direction and size of the axial load Fa applied to the input shaft of the gear box, which lasts for 1-2 minutes.

[0014] Three, observe the leakage

[0015] 3-1, brake the driving main shaft, and after the driving main shaft stops rotating, observe whether there is leakage at the connection between the metal bellows of the coupling and the inner and outer teeth of the coupling.

[0016] 3-2, if the coupling leaks lubricating oil, disassemble the coupling for repair; if the coupling does not leak lubricating oil, empty the lubricating oil in the coupling, then disassemble the coupling and mark it as a qualified product.

[0017] Further, in step 2-3, the radial load applied to the input shaft of the gear box in different directions is at least four, and the radial load Fr applied to the input shaft of the gear box in the same direction is at least two.

[0018] Further, after step 2-5, the following operations are performed:

[0019] 2-6, apply a radial load Fr and an axial load Fa to the input shaft of the gear box at the same time, so that the input shaft of the gear box produces radial displacement and axial displacement relative to the driving main shaft; change the size of the radial load Fr and the axial load Fa to adjust the amount of radial displacement and the amount of axial displacement of the input shaft of the gear box; this step lasts for 1-2 minutes.

[0020] Further, after step 2-6, the following operations are performed:

[0021] 2-7, change the direction and size of the radial load Fr applied to the gearbox input shaft, and the direction and size of the axial load Fa applied to the gearbox input shaft, at least four different directions of the radial load applied to the gearbox input shaft, at least two different sizes of the radial load Fr applied to the gearbox input shaft in the same direction; when changing the direction and size of the radial load Fr applied to the gearbox input shaft, change the direction and size of the axial load Fa applied to the gearbox input shaft; this step lasts for 2-4 minutes.

[0022] Further, the following operations are performed after step 3-2:

[0023] Four, reverse assembly

[0024] 4-1, turn over the shaft coupling, then fix the outer teeth of one end of the rail transit shaft coupling to the gearbox input shaft, and fix the outer teeth of the other end of the rail transit shaft coupling to the driving main shaft.

[0025] 4-2, inject enough lubricating oil into the shaft coupling again, and close the oil injection hole after the oil injection is completed.

[0026] Five, reverse rotation drive

[0027] 5-1, drive the driving main shaft to rotate, and then drive the gearbox input shaft to rotate through the shaft coupling; in this process, the speed of the driving main shaft is adjusted to adjust the speed of the gearbox input shaft; this step lasts for 2-4 minutes.

[0028] 5-2, apply a radial load Fr to the gearbox input shaft, change the size of the radial load Fr, and adjust the radial displacement of the gearbox input shaft; this step lasts for 1-2 minutes.

[0029] 5-3, change the direction and size of the radial load Fr applied to the gearbox input shaft, this step lasts for 1-2 minutes.

[0030] 5-4, apply an axial load Fa to the gearbox input shaft, change the size of the axial load Fa, and adjust the axial displacement of the gearbox input shaft; this step lasts for 1-2 minutes.

[0031] 5-5, change the direction and size of the axial load Fa applied to the gearbox input shaft, this step lasts for 1-2 minutes.

[0032] Six, observe the leakage again

[0033] 6-1, brake the driving main shaft, and after the driving main shaft stops rotating, observe whether there is leakage at the connection between the metal bellows of the shaft coupling and the inner and outer teeth of the shaft coupling.

[0034] 6-2, if the coupling occurs lubricating oil leakage, the coupling is disassembled and then repaired, if the coupling does not occur lubricating oil leakage, the lubricating oil in the coupling is emptied, and then the coupling is disassembled and marked as qualified product.

[0035] Further, in step 5-3, at least four different directions of radial loads are applied to the input shaft of the gear box, and at least two different sizes of radial loads Fr in the same direction are applied to the input shaft of the gear box.

[0036] Further, after step 5-5, the following operations are performed:

[0037] 5-6, radial load Fr and axial load Fa are applied to the input shaft of the gear box at the same time, so that the input shaft of the gear box generates radial displacement and axial displacement relative to the driving main shaft 1; the size of the radial load Fr and the axial load Fa is changed, and the amount of radial displacement and axial displacement of the input shaft of the gear box is adjusted; this step lasts for 1-2 minutes.

[0038] Further, after step 5-6, the following operations are performed:

[0039] 5-7, the direction and size of the radial load Fr applied to the input shaft of the gear box and the direction and size of the axial load Fa applied to the input shaft of the gear box are changed, at least four different directions of radial loads are applied to the input shaft of the gear box, and at least two different sizes of radial loads Fr in the same direction are applied to the input shaft of the gear box; when the direction and size of each pair of radial loads Fr applied to the input shaft of the gear box are changed, the direction and size of the axial load Fa applied to the input shaft of the gear box are changed; this step lasts for 2-4 minutes.

[0040] The beneficial effects of the present application are: the present application can avoid the detection blind area of the gas negative pressure static detection method by simulating the actual working condition of the coupling and then observing the lubricating oil leakage. The coupling works in the simulated actual working condition, which can fully expose the problems of the coupling, and then truly and accurately reflect and find the lubricating oil leakage fault, and realize dynamic detection. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is a schematic view when the driving main shaft is coaxial with the input shaft of the gear box;

[0042] Figure 2 It is a schematic view of the radial displacement of the input shaft of the gear box relative to the driving main shaft;

[0043] Figure 3 It is a schematic view of the axial displacement of the input shaft of the gear box relative to the driving main shaft

[0044] Figure 4A schematic diagram showing the axial and radial displacement of the gearbox input shaft relative to the drive shaft.

[0045] Figure 5 The second schematic diagram shows the radial displacement of the gearbox input shaft relative to the drive shaft.

[0046] Figure 6 A schematic diagram showing the application of a radial load to the input shaft of the gearbox;

[0047] Figure 7 A schematic diagram showing the application of an axial load to the input shaft of the gearbox;

[0048] Figure 8 This is a schematic diagram showing the application of axial and radial loads to the input shaft of the gearbox.

[0049] In the diagram: 1 is the drive spindle, and 2 is the gearbox input shaft. Detailed Implementation

[0050] The present invention will now be described in detail with reference to the accompanying drawings.

[0051] like Figure 1 As shown, drive shaft 1 is the output shaft of the train's traction motor, and gearbox input shaft 2 is the input end of the transmission gearbox. The rail transit coupling is installed between drive shaft 1 and gearbox input shaft 2. Under normal operating conditions, drive shaft 1 and gearbox input shaft 2 are coaxial. When the train's route changes, or the track becomes uneven, axial and / or radial displacement will occur between gearbox input shaft 2 and drive shaft 1. Figure 2 , Figure 5 As shown, the gearbox input shaft 2 undergoes radial displacement relative to the drive shaft 1. For example... Figure 3 As shown, the gearbox input shaft 2 undergoes axial displacement relative to the drive shaft 1. For example... Figure 4 As shown, the gearbox input shaft 2 undergoes axial and radial displacement relative to the drive shaft 1.

[0052] To simulate the actual working conditions of the coupling and to test its sealing performance under actual conditions, this invention employs the following process steps to perform dynamic sealing testing on the coupling.

[0053] I. Coupling Assembly

[0054] 1. Install the rail transit coupling between the drive shaft 1 and the gearbox input shaft 2, where the drive shaft 1 is considered the output shaft of the train traction motor, and the gearbox input shaft 2 is considered the input end of the transmission gearbox. During installation, fix the external gear at one end of the rail transit coupling to the drive shaft 1, and fix the external gear at the other end of the rail transit coupling to the gearbox input shaft 2.

[0055] 2. Inject sufficient lubricating oil into the coupling, and seal the oil injection hole after the oil injection is completed.

[0056] II. Rotational driving of the coupling

[0057] 1. Drive the driving spindle 1 to rotate, and then drive the gear box input shaft 2 to rotate through the coupling; in this process, the rotational speed of the driving spindle 1 is adjusted to adjust the rotational speed of the gear box input shaft 2; this step lasts for 2-4 minutes.

[0058] 2. As shown in Figure 6 , apply a radial load Fr to the gear box input shaft 2 to make the gear box input shaft 2 produce a radial displacement relative to the driving spindle 1; change the size of the radial load Fr to adjust the amount of radial displacement of the gear box input shaft 2; this step lasts for 1-2 minutes.

[0059] 3. Change the direction and size of the radial load Fr applied to the gear box input shaft 2; there are at least four radial loads of different directions applied to the gear box input shaft 2, and there are at least two radial loads of different sizes applied to the gear box input shaft 2 in the same direction; this step lasts for 1-2 minutes.

[0060] 4. As shown in Figure 7 , apply an axial load Fa to the gear box input shaft 2 to make the gear box input shaft 2 produce an axial displacement relative to the driving spindle 1; change the size of the axial load Fa to adjust the amount of axial displacement of the gear box input shaft 2; this step lasts for 1-2 minutes.

[0061] 5. Change the direction and size of the axial load Fa applied to the gear box input shaft 2, i.e. apply a reverse axial load Fa to the gear box input shaft 2, and change the size of the axial load Fa applied to the gear box input shaft 2; this step lasts for 1-2 minutes.

[0062] 6. As shown in Figure 8 , apply a radial load Fr and an axial load Fa to the gear box input shaft 2 at the same time to make the gear box input shaft 2 produce a radial displacement and an axial displacement relative to the driving spindle 1; change the size of the radial load Fr and the axial load Fa to adjust the amount of radial displacement and the amount of axial displacement of the gear box input shaft 2; this step lasts for 1-2 minutes.

[0063] 7. Change the direction and size of the radial load Fr applied to the gear box input shaft 2, and change the direction and size of the axial load Fa applied to the gear box input shaft 2; there are at least four radial loads of different directions applied to the gear box input shaft 2, and there are at least two radial loads of different sizes applied to the gear box input shaft 2 in the same direction; when the direction and size of each pair of radial loads Fr applied to the gear box input shaft 2 are changed, the direction and size of the axial load Fa applied to the gear box input shaft 2 are changed; this step lasts for 2-4 minutes.

[0064] III. Observe the leak

[0065] 1. Apply the brakes to the drive spindle. After the drive spindle stops rotating, observe whether there is any leakage at the connection between the metal bellows of the coupling and the internal and external gears of the coupling.

[0066] 2. If the coupling leaks lubricating oil, disassemble the coupling for inspection and repair; if the coupling does not leak lubricating oil, drain the lubricating oil from the coupling and then disassemble the coupling.

[0067] IV. Reverse Assembly

[0068] 1. Turn the coupling around, then fix the external gear at one end of the rail transit coupling to the gearbox input shaft 2, and fix the external gear at the other end of the rail transit coupling to the drive main shaft 1.

[0069] 2. Add sufficient lubricating oil to the coupling again, and seal the oil filling hole after the oiling is completed.

[0070] V. Reverse Rotation Drive

[0071] 1. Drive the drive spindle 1 to rotate, which in turn drives the gearbox input shaft 2 to rotate through the coupling; during this process, adjust the speed of the drive spindle 1 to adjust the speed of the gearbox input shaft 2; this step lasts for 2-4 minutes.

[0072] 2. For example Figure 6 As shown, a radial load Fr is applied to the gearbox input shaft 2, causing the gearbox input shaft 2 to produce a radial displacement relative to the drive spindle 1; the magnitude of the radial load Fr is changed to adjust the radial displacement of the gearbox input shaft 2; this step lasts for 1-2 minutes;

[0073] 3. Change the direction and magnitude of the radial load Fr applied to the gearbox input shaft 2. There should be at least four radial loads in different directions applied to the gearbox input shaft 2, and at least two radial loads Fr of different magnitudes applied to the gearbox input shaft 2 in the same direction. This step should last for 1-2 minutes.

[0074] 4. Apply an axial load Fa to the gearbox input shaft 2 to cause axial displacement of the gearbox input shaft 2 relative to the drive spindle 1; change the magnitude of the axial load Fa to adjust the amount of axial displacement of the gearbox input shaft 2; this step lasts for 1-2 minutes.

[0075] 5. Change the direction and magnitude of the axial load Fa applied to the gearbox input shaft 2, that is, apply a reverse axial load Fa to the gearbox input shaft 2 to change the magnitude of the axial load Fa applied to the gearbox input shaft 2; this step lasts for 1-2 minutes.

[0076] 6. Simultaneously apply radial load Fr and axial load Fa to the gearbox input shaft 2, so that the gearbox input shaft 2 generates radial and axial displacement relative to the drive spindle 1; change the magnitude of radial load Fr and axial load Fa to adjust the radial and axial displacement of the gearbox input shaft 2; this step lasts for 1-2 minutes.

[0077] 7. Change the direction and magnitude of the radial load Fr applied to the gearbox input shaft 2, and the direction and magnitude of the axial load Fa applied to the gearbox input shaft 2. There are at least four radial loads applied to the gearbox input shaft 2 in different directions, and at least two radial loads Fr of different magnitudes applied to the gearbox input shaft 2 in the same direction. When the direction and magnitude of the radial load Fr applied to the gearbox input shaft 2 are changed, the direction and magnitude of the axial load Fa applied to the gearbox input shaft 2 are also changed. This step lasts for 2-4 minutes.

[0078] VI. Observe the leak again

[0079] 1. Apply the brakes to the drive spindle. After the drive spindle stops rotating, observe whether there is any leakage at the connection between the metal bellows of the coupling and the internal and external gears of the coupling.

[0080] 2. If the coupling leaks lubricating oil, disassemble the coupling for inspection and repair; if the coupling does not leak lubricating oil, drain the lubricating oil from the coupling, then disassemble the coupling and mark it as a qualified product.

[0081] This invention simulates the actual working conditions of couplings and then observes lubricating oil leaks, thus avoiding the blind spots present in negative pressure gas detection methods. By operating the coupling under simulated real-world conditions, any problems with the coupling can be fully exposed, allowing for a true and accurate detection of lubricating oil leaks and achieving dynamic sealing performance testing.

Claims

1. A process for detecting the sealing property of a metal bellows coupling, characterized by, Comprising the following steps: I. Coupler assembly (1-1), install the rail transit coupler between the driving main shaft and the gear box input shaft; (1-2), inject a sufficient amount of lubricating oil into the coupler, and after the oil injection is completed, close the oil injection hole; II. Coupler rotation drive (2-1), drive the driving main shaft to rotate through the coupler to drive the gear box input shaft to rotate; in this process, the rotational speed of the driving main shaft is adjusted, and this step lasts for 2-4 minutes; (2-2), apply a radial load Fr to the gear box input shaft, and change the radial load Fr to adjust the radial displacement amount of the gear box input shaft, which lasts for 1-2 minutes; (2-3), change the direction and size of the radial load Fr applied to the gear box input shaft, which lasts for 1-2 minutes; (2-4), apply an axial load Fa to the gear box input shaft, change the axial load Fa to adjust the axial displacement amount of the gear box input shaft, which lasts for 1-2 minutes; (2-5), change the direction and size of the axial load Fa applied to the gear box input shaft, which lasts for 1-2 minutes; III. Observation of leakage (3-1), brake the driving main shaft, and after the driving main shaft stops rotating, observe whether there is leakage at the connection between the metal bellows of the coupler and the inner and outer teeth of the coupler; (3-2), if the coupler leaks lubricating oil, disassemble the coupler for repair; if the coupler does not leak lubricating oil, empty the lubricating oil in the coupler, then disassemble the coupler and mark it as a qualified product; In step (2-3), the different direction radial loads applied to the gear box input shaft are at least four, and the different size radial loads Fr applied to the gear box input shaft in the same direction are at least two; After step (2-5), the following operation is performed: (2-6), simultaneously apply a radial load Fr and an axial load Fa to the gear box input shaft, so that the gear box input shaft produces radial displacement and axial displacement relative to the driving main shaft; change the size of the radial load Fr and the axial load Fa to adjust the radial displacement amount and the axial displacement amount of the gear box input shaft; this step lasts for 1-2 minutes; After step (2-6), the following operation is performed: (2-7) change the direction and size of the radial load Fr applied to the gear box input shaft, and the direction and size of the axial load Fa applied to the gear box input shaft, the different direction radial loads applied to the gear box input shaft are at least four, and the different size radial loads Fr applied to the gear box input shaft in the same direction are at least two; when each pair of radial loads Fr applied to the gear box input shaft changes in direction and size, the axial load Fa applied to the gear box input shaft changes in direction and size; this step lasts for 2-4 minutes; After step (3-2), the following operation is performed: IV. Reverse assembly (4-1), turn the coupler over, then fixedly connect the outer teeth at one end of the rail transit coupler with the gear box input shaft, and fixedly connect the outer teeth at the other end of the rail transit coupler with the driving main shaft; (4-2), inject a sufficient amount of lubricating oil into the coupler again, and after the oil injection is completed, close the oil injection hole; V. Reverse rotation driving (5-1), drive the driving spindle to rotate, and then drive the gear box input shaft to rotate through the coupling; in this process, the rotation speed of the driving spindle is adjusted to adjust the rotation speed of the gear box input shaft; this step lasts for 2-4 minutes; (5-2), apply a radial load Fr to the gear box input shaft, change the size of the radial load Fr, and adjust the radial displacement amount of the gear box input shaft; this step lasts for 1-2 minutes; (5-3), change the direction and size of the radial load Fr applied to the gear box input shaft; this step lasts for 1-2 minutes; (5-4), apply an axial load Fa to the gear box input shaft, change the size of the axial load Fa, and adjust the axial displacement amount of the gear box input shaft; this step lasts for 1-2 minutes; (5-5), change the direction and size of the axial load Fa applied to the gear box input shaft; this step lasts for 1-2 minutes; VI. Re-observe the leakage (6-1), brake the driving spindle, and after the driving spindle stops rotating, observe whether there is leakage at the connection between the metal bellows of the coupling and the inner and outer teeth of the coupling; (6-2), if the coupling leaks lubricating oil, disassemble the coupling for repair; if the coupling does not leak lubricating oil, empty the lubricating oil in the coupling, and then disassemble the coupling and mark it as a qualified product.

2. The process for detecting the sealing property of a metal bellows coupling according to claim 1, wherein In step (5-3), the radial load applied to the gear box input shaft in different directions is at least four, and the radial load Fr applied to the gear box input shaft in the same direction is at least two.

3. The process for detecting the sealing property of a metal bellows coupling according to claim 2, wherein After step (5-5), the following operations are performed: (5-6), simultaneously apply a radial load Fr and an axial load Fa to the gear box input shaft to cause the gear box input shaft to produce radial displacement and axial displacement relative to the driving spindle; change the size of the radial load Fr and the axial load Fa to adjust the radial displacement amount and the axial displacement amount of the gear box input shaft; this step lasts for 1-2 minutes.

4. The process for detecting the sealing property of a metal bellows coupling according to claim 3, wherein After step (5-6), the following operations are performed: (5-7), change the direction and size of the radial load Fr applied to the gear box input shaft and the direction and size of the axial load Fa applied to the gear box input shaft; the radial load applied to the gear box input shaft in different directions is at least four, and the radial load Fr applied to the gear box input shaft in the same direction is at least two; when the direction and size of each pair of radial load Fr applied to the gear box input shaft are changed, the direction and size of the axial load Fa applied to the gear box input shaft are changed; this step lasts for 2-4 minutes.

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