A stern shaft sealing device axial displacement dynamic loading test bench

Abstract

The application relates to a kind of axial displacement dynamic loading test benches of stern shaft sealing device, power system is connected axial displacement loading system by transmission system, axial displacement loading system connects test assembly, test assembly is installed stern shaft sealing device, axial displacement dynamic loading is carried out to stern shaft sealing device in test assembly by power system through transmission system driving axial displacement loading system, simulate the axial displacement dynamic change of stern shaft sealing device when ship speed is changed or is subjected to impact load. The test bench is compact in structure, and the tested stern shaft sealing device is convenient to disassemble, can simulate the axial displacement change of stern shaft sealing device when ship speed is changed or is subjected to impact load, and axial dynamic displacement loading is carried out to stern shaft sealing device under the operation state of shafting. The test bench is suitable for sealing performance test, wear performance test and durability test of stern shaft sealing device under the dynamic and static axial displacement loading state.

Description

Technical Field

[0001] This invention relates to a test bench for a stern shaft sealing device, and more particularly to a dynamic loading test bench for the axial displacement of a stern shaft sealing device. Background Technology

[0002] The stern shaft seal is a crucial accessory in a ship's propulsion system shafting. Installed on the stern tube and stern shaft, it is a mechanical seal on the end face of the stern shaft passing through the stern of the hull, its function being to prevent seawater from entering the compartments. The stern shaft seal operates under the most severe conditions when the ship changes speed or is subjected to impact loads. In these situations, the seal's performance affects the ship's maneuverability and reliability. Therefore, extensive verification tests on test benches are necessary during the development phase or before the equipment leaves the factory to evaluate its performance. However, existing test benches can only adjust the axial displacement of the stern shaft seal when the shafting is stationary, and cannot simulate the changes in axial displacement of the stern shaft seal when the ship is running and changing speed or subjected to impact loads. For example, patent publication CN104266799B discloses a test bench for a ship shafting end face seal, and patent publication CN107576490A discloses a test bench for the sealing performance of a stern shaft seal, neither of which can dynamically load the stern shaft seal with axial displacement while the shafting is in operation. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention aims to provide a dynamic loading test bench for the axial displacement of a stern shaft sealing device. This test bench can simulate the axial displacement changes of the stern shaft sealing device when a ship changes speed or is subjected to impact loads during operation. It can dynamically load the stern shaft sealing device under shaft system operation conditions and is suitable for sealing performance testing, wear performance testing, and durability testing of stern shaft sealing devices.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A dynamic loading test bench for axial displacement of a stern shaft sealing device includes a power system, a transmission system, an axial displacement loading system, a test assembly, and a mounting base. The power system is connected to the axial displacement loading system via the transmission system, and the axial displacement loading system is connected to the test assembly. The stern shaft sealing device is installed in the test assembly. The power system drives the axial displacement loading system via the transmission system to dynamically load the axial displacement of the stern shaft sealing device in the test assembly, simulating the dynamic changes in axial displacement of the stern shaft sealing device when the ship changes speed or is subjected to impact loads during operation.

[0006] Furthermore, the power system consists of a motor and a starter box, a motor support, a small synchronous pulley, and a synchronous belt. The motor is mounted on the motor support, and the motor output shaft is equipped with a small synchronous pulley, which is connected to a large synchronous pulley mounted on the transmission shaft system via a synchronous belt.

[0007] Furthermore, the transmission system includes a fixed-end bearing assembly, a floating-end bearing assembly, a transmission shaft system, and a transmission device frame. The transmission shaft system is mounted on the transmission device frame via the fixed-end bearing assembly and the floating-end bearing assembly. The transmission device frame is connected to the mounting base by bolts.

[0008] Furthermore, the fixed-end bearing assembly comprises a round nut a, a spacer, a planar thrust ball bearing a, a planar thrust ball bearing b, a self-aligning roller bearing, a sealing cap, a positioning sleeve, and a front bearing sleeve. The round nut a, spacer, planar thrust ball bearing a, planar thrust ball bearing b, and self-aligning roller bearing are sequentially mounted on the adapter sleeve. The round nut a is axially fixed to the adapter sleeve via threads. A positioning sleeve is installed between the planar thrust ball bearing a and the planar thrust ball bearing b. The sealing cap is mounted on the positioning sleeve with screws, the positioning sleeve is mounted on the front bearing sleeve with screws, and the front bearing sleeve is mounted on the transmission device frame with screws.

[0009] Furthermore, the transmission shaft system comprises a pressure cap, a large synchronous pulley, key a, a transition sleeve, a self-lubricating bearing a, key b, a transmission shaft, a self-lubricating bearing b, a self-lubricating bearing cover plate, a transmission shaft sleeve, key c, and a round nut b. The large synchronous pulley is mounted on the transition sleeve via key a. The transmission shaft passes through the transition sleeve, and the transition sleeve and transmission shaft are clearance-fitted. Self-lubricating bearings a and b are installed between them for support, and torque is transmitted via key b. The pressure cap is connected to the large synchronous pulley and the transition sleeve via screws, providing axial positioning for the self-lubricating bearing a. The self-lubricating bearing cover plate is connected to the transition sleeve via screws, providing axial positioning for the self-lubricating bearing b. The transmission shaft sleeve is mounted on the transmission shaft via key c, and the round nut b is connected to the transmission shaft via threads, providing axial positioning for the transmission shaft sleeve.

[0010] Furthermore, the displacement loading system includes a hydraulic station, an axial displacement loading device, and a hydraulic cylinder fixing support. One flange of the hydraulic cylinder fixing support is connected to the axial displacement loading device by bolts, and the other flange is connected to the large synchronous pulley by bolts.

[0011] Furthermore, the axial displacement loading device consists of a hydraulic rotary joint and an axial displacement hydraulic cylinder. The cylinder body of the axial displacement hydraulic cylinder is connected to the hydraulic cylinder fixed support, and the piston rod of the axial displacement hydraulic cylinder is connected to the transmission shaft through a thread.

[0012] Furthermore, the test assembly includes a simulated seawater tank, a test shaft, a transition shaft, and a tail bearing seat assembly. The simulated seawater tank is bolted to the mounting base. The test shaft is connected to the transmission shaft system. The stern shaft sealing device is installed on the simulated seawater tank and the test shaft. The transition shaft is connected to the transmission shaft system and supports the transmission shaft system via the tail bearing seat assembly installed on the mounting base.

[0013] Furthermore, the test shaft is mounted on the drive shaft, with self-lubricating bearings c and d installed between them, and the end face is connected to the drive shaft sleeve by screws.

[0014] Furthermore, one end of the adapter shaft is connected to the drive shaft via a thread, and the other end is installed in the tail end bearing housing assembly. The tail end bearing housing assembly consists of a bearing housing, a self-aligning roller bearing, a linear slide rail assembly, and a support. The self-aligning roller bearing is heat-fitted onto the adapter shaft and installed in the bearing housing. The bearing housing is connected to the linear slide rail assembly installed on the support via bolts. The tail end bearing housing assembly is radially limited but axially reciprocating.

[0015] The beneficial effects of this invention are:

[0016] Compared with existing technologies, this invention features a compact structure for the dynamic loading test bench for axial displacement of the stern shaft sealing device. The motor and transmission system are arranged side-by-side, transmitting power via a synchronous pulley and belt. This invention utilizes a high-precision hydraulic cylinder to achieve axial displacement loading, offering advantages such as fast response and high control accuracy. Equipped with an adapter shaft and a stern bearing housing, this invention effectively supports the tested stern shaft sealing device and test shaft, while also allowing for easy disassembly, high replacement efficiency, and good maintainability. Through the integrated coordination of the power system, transmission system, axial displacement loading system, test components, and mounting base, this invention enables dynamic displacement loading of the stern shaft sealing device while the shaft system is in operation. This solves the problem that existing test benches cannot simulate the dynamic changes in axial displacement of the stern shaft sealing device under changes in ship speed or impact loads during operation. Furthermore, the transmission shaft system can be locked via the hydraulic station valve group or the stern bearing housing group, limiting its axial movement and allowing for static loading tests only on stern shaft sealing devices with a fixed compression. This test bench can conduct sealing performance tests, wear performance tests, and durability tests on the stern shaft sealing device under conditions that are closer to the actual operating conditions of a ship. Attached Figure Description

[0017] Figure 1 This is a front sectional view of the dynamic loading test bench for axial displacement of the stern shaft sealing device of the present invention;

[0018] Figure 2 This is a top view of the dynamic loading test bench for axial displacement of the stern shaft sealing device of the present invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 , Figure 2As shown, a dynamic loading test bench for axial displacement of a stern shaft sealing device includes a starter box 1, a hydraulic station 2, a motor 3, a motor support 4, a small synchronous pulley 5, a synchronous belt 6, a hydraulic rotary joint 7, a hydraulic cylinder for axial displacement 8, a hydraulic cylinder fixing support 9, a pressure cover 10, a large synchronous pulley 11, a key a12, a self-lubricating bearing a13, a round nut a14, a sealing cover 15, a spacer 16, a planar thrust ball bearing a17, a positioning sleeve 18, a planar thrust ball bearing b19, and a front bearing sleeve. 20. Self-aligning roller bearing; 21. Transmission device stand; 22. Key b; 23. Transmission shaft; 24. Adapter bushing; 25. Self-lubricating bearing b; 26. Self-lubricating bearing cover plate; 27. Self-lubricating bearing c; 28. Simulated seawater tank; 29. ​​Stern shaft sealing device; 30. Test shaft; 31. Self-lubricating bearing d; 32. Key c; 33. Transmission shaft bushing; 34. Round nut b; 35. Adapter shaft; 36. Bearing housing; 37. Self-aligning roller bearing; 38. Linear slide rail assembly; 39. Support; 40. Mounting base; 41, etc.

[0021] The axial displacement dynamic loading test bench for the stern shaft sealing device consists of a power system, a transmission system, an axial displacement loading system, test components, and a mounting base 41. The power system consists of a motor 3, a starter box 1, a motor support 4, a small synchronous pulley 5, and a synchronous belt 6. The motor 3 is mounted on the motor support 4, and the motor output shaft is equipped with a small synchronous pulley 5, which is connected to a large synchronous pulley 11 mounted on the transmission shaft system via the synchronous belt 6, providing power to the transmission shaft system. The motor 3 and the transmission shaft system are arranged side by side, resulting in a compact structure.

[0022] The transmission system includes a fixed-end bearing assembly, a floating-end bearing assembly, a transmission shaft system, and a transmission device frame 22. The transmission shaft system is mounted on the transmission device frame 22 via the fixed-end bearing assembly and the floating-end bearing assembly. The transmission device frame 22 is bolted to the mounting base 41. The fixed-end bearing assembly consists of a round nut a14, a spacer 16, a planar thrust ball bearing a17, a planar thrust ball bearing b19, a self-aligning roller bearing 21, a sealing cover 15, a positioning sleeve 18, and a front bearing sleeve 20. The round nut 14, spacer 16, planar thrust ball bearing a17, planar thrust ball bearing b19, and self-aligning roller bearing 21 are sequentially mounted on the adapter sleeve 25. The round nut a14 is axially fixed to the adapter sleeve 25 via threads. A spacer 16 is installed between the round nut a14 and the planar thrust ball bearing a17 for limiting the movement. A positioning sleeve 18 is installed between the planar thrust ball bearing a17 and the planar thrust ball bearing b19. The sealing cover is mounted on the positioning sleeve 18 by screws, the positioning sleeve 18 is mounted on the front bearing sleeve 20 by screws, and the front bearing sleeve 20 is mounted on the transmission device frame 22 by screws. The fixed end bearing assembly, through the combination of bearings and its special structure, can withstand large radial and axial forces, effectively supporting the weight of the transmission shaft system and the axial force during axial displacement loading.

[0023] The transmission shaft system consists of a pressure cap 10, a large synchronous pulley 11, a key a12, a transition sleeve 25, a self-lubricating bearing a13, a key b23, a transmission shaft 24, a self-lubricating bearing b26, a self-lubricating bearing cover plate 27, a transmission shaft sleeve 34, a key c33, and a round nut b35. The large synchronous pulley 11 is mounted on the adapter sleeve 25 via key a12 to transmit power. A drive shaft 24 passes through the adapter sleeve 25, with a clearance fit between the adapter sleeve 25 and the drive shaft 24. Self-lubricating bearings a13 and b26 are installed between them for support, and torque is transmitted via key b23. Due to the special properties of the self-lubricating bearings a13 and b26, the drive shaft 24 can not only rotate but also reciprocate while rotating. The pressure cap 10 is connected to the large synchronous pulley 11 and the adapter sleeve 25 via screws, axially limiting the self-lubricating bearing a13. The self-lubricating bearing cover plate 27 is connected to the adapter sleeve 25 via screws, axially limiting the self-lubricating bearing b26. The drive sleeve 34 is mounted on the drive shaft 24 via key c33, and a round nut b35 is connected to the drive shaft 24 via threads, axially limiting the drive sleeve 34. The drive shaft 24 transmits power to the drive shaft sleeve 34 via key c33, and the drive shaft sleeve 34 then drives the test shaft 31 to rotate and reciprocate.

[0024] The displacement loading system includes a hydraulic station 2, an axial displacement loading device, and a hydraulic cylinder fixing support 9. One flange of the hydraulic cylinder fixing support 9 is connected to the axial displacement loading device via screws, and the other flange is connected to the large synchronous pulley 11 via screws. The axial displacement loading device consists of a hydraulic rotary joint 7 and an axial displacement hydraulic cylinder 8. The cylinder body 8 of the axial displacement hydraulic cylinder is connected to the hydraulic cylinder fixing support 9, and the piston rod of the axial displacement hydraulic cylinder 8 is connected to the drive shaft 24 via threads. The hydraulic station 2 provides pressurized oil with controllable pressure and flow to the hydraulic rotary joint 7. The hydraulic rotary joint 7 is stationary, while the axial displacement hydraulic cylinder 8 rotates with the drive shaft 24. Through a special structure, the hydraulic rotary joint 7 can supply pressurized oil to the axial displacement hydraulic cylinder 8, thereby causing the piston rod of the axial displacement hydraulic cylinder 8 to reciprocate during rotation.

[0025] The test assembly includes a simulated seawater tank 29, a test shaft 31, a transition shaft 36, and a tail bearing housing assembly. The simulated seawater tank 29 is bolted onto the mounting base 41. The test shaft 31 is connected to the transmission shaft system. A stern shaft sealing device 30 is installed on the simulated seawater tank 29 and the test shaft 36. The transition shaft 36 is connected to the transmission shaft system, which is supported by the tail bearing housing assembly mounted on the mounting base 41. The tail bearing housing assembly consists of a bearing housing 37, a self-aligning roller bearing 38, a linear guide rail assembly 39, and a support 40. The self-aligning roller bearing 38 is heat-fitted onto the transition shaft 36 and installed within the bearing housing 37. The bearing housing 37 is bolted to the linear guide rail assembly 39 mounted on the support 40. The tail bearing housing assembly is radially limited but axially reciprocating, providing support. It is also easy to disassemble during replacement, offering high replacement efficiency and good maintainability.

[0026] The working principle of the axial displacement dynamic loading test bench for the stern shaft sealing device is as follows: the starter box 1 controls the rotation of the motor 3 and the pressure and flow of the hydraulic oil in the hydraulic station 2. The power of the motor 3 is transmitted to the drive shaft 24 through the small synchronous pulley 5, the synchronous belt 6, and the large synchronous pulley 11, driving the drive shaft 24 to rotate. The hydraulic station 2 supplies controllable pressure oil to the cylinder body 8 of the axial displacement hydraulic cylinder through the hydraulic rotary joint 7. The piston rod of the axial displacement hydraulic cylinder body 8 is connected to the drive shaft 24 through threads, which can drive the drive shaft 24 to move axially back and forth. The transition sleeve 25 is stationary and is mounted on the transmission device frame 22 through the fixed end bearing assembly and the floating end bearing assembly. Self-lubricating bearings a13 and b are installed between the transition sleeve 25 and the drive shaft 24, so that the drive shaft 24 can rotate and move axially back and forth relative to the transition sleeve 25. The drive shaft 24 transmits power to the drive sleeve 34 through the key c33, and then the drive sleeve 34 drives the test shaft 31 to rotate and move back and forth. The stern shaft sealing device 30 is mounted on the simulated seawater tank 29 and the test shaft 36. The simulated seawater tank 29 is stationary, while the test shaft 36 can rotate and reciprocate relative to the simulated seawater tank 29. Therefore, the portion of the stern shaft sealing device 30 mounted on the test shaft 36 can also rotate and reciprocate relative to the simulated seawater tank 29. The adapter shaft 36 is connected to the transmission shaft system, which is supported by a stern bearing housing assembly mounted on the mounting base 41. The stern bearing housing assembly is radially limited but axially reciprocating. In summary, the stern shaft sealing device axial displacement dynamic loading test bench can dynamically load the stern shaft sealing device with axial displacement while the shaft system is in operation, simulating the dynamic changes in axial displacement of the stern shaft sealing device when the ship changes speed or is subjected to impact loads. Simultaneously, the transmission shaft system can be locked via the hydraulic station valve group or the stern bearing housing assembly, thus limiting the axial movement of the transmission shaft system. Static loading tests can only be performed on stern shaft sealing devices with a fixed compression. This test bench can conduct sealing performance tests, wear performance tests, and durability tests on the stern shaft sealing device under conditions that are closer to the actual operating conditions of a ship.

Claims

1. A dynamic loading test bench for axial displacement of a stern shaft sealing device, characterized in that: The system includes a power system, a transmission system, an axial displacement loading system, a test assembly, and a mounting base. The power system is connected to the axial displacement loading system via the transmission system, which in turn is connected to the test assembly. A stern shaft seal is installed in the test assembly. The power system drives the axial displacement loading system via the transmission system to dynamically load the stern shaft seal in the test assembly, simulating the dynamic changes in axial displacement of the stern shaft seal during ship operation due to changes in speed or impact loads. The transmission system includes a fixed-end bearing assembly, a floating-end bearing assembly, a transmission shaft system, and a transmission device frame. The transmission shaft system is connected to the floating-end bearing assembly via the fixed-end bearing assembly. The device is mounted on a transmission device stand, which is bolted to the mounting base. The axial displacement loading system includes a hydraulic station, an axial displacement loading device, and a hydraulic cylinder fixing support. One flange of the hydraulic cylinder fixing support is bolted to the axial displacement loading device, and the other flange is bolted to the large synchronous pulley. The test assembly includes a simulated seawater tank, a test shaft, a transition shaft, and a tail bearing seat assembly. The simulated seawater tank is bolted to the mounting base. The test shaft is connected to the transmission shaft system. The stern shaft sealing device is installed on the simulated seawater tank and the test shaft. The transition shaft is connected to the transmission shaft system, which is supported by the tail bearing seat assembly mounted on the mounting base.

2. The axial displacement dynamic loading test bench for the stern shaft sealing device according to claim 1, characterized in that: The power system consists of a motor and starter box, motor support, small synchronous pulley, and synchronous belt. The motor is mounted on the motor support, and the motor output shaft is equipped with a small synchronous pulley, which is connected to a large synchronous pulley mounted on the transmission shaft system via the synchronous belt.

3. The axial displacement dynamic loading test bench for the stern shaft sealing device according to claim 1, characterized in that: The fixed-end bearing assembly consists of a round nut a, a spacer, a planar thrust ball bearing a, a planar thrust ball bearing b, a self-aligning roller bearing, a sealing cover, a positioning sleeve, and a front bearing sleeve. The round nut a, spacer, planar thrust ball bearing a, planar thrust ball bearing b, and self-aligning roller bearing are sequentially installed on the adapter sleeve. The round nut a is axially fixed to the adapter sleeve by threads. A positioning sleeve is installed between the planar thrust ball bearing a and the planar thrust ball bearing b. The sealing cover is installed on the positioning sleeve by screws. The positioning sleeve is installed on the front bearing sleeve by screws. The front bearing sleeve is installed on the transmission device frame by screws.

4. The axial displacement dynamic loading test bench for the stern shaft sealing device according to claim 1, characterized in that: The transmission shaft system consists of a pressure cap, a large synchronous pulley, key a, a transition sleeve, a self-lubricating bearing a, key b, a transmission shaft, a self-lubricating bearing b, a self-lubricating bearing cover plate, a transmission shaft sleeve, key c, and a round nut b. The large synchronous pulley is mounted on the transition sleeve via key a. The transmission shaft passes through the transition sleeve, and the transition sleeve and transmission shaft are clearance-fitted. Self-lubricating bearings a and b are installed between them for support, and torque is transmitted through key b. The pressure cap is connected to the large synchronous pulley and the transition sleeve via screws, providing axial positioning for the self-lubricating bearing a. The self-lubricating bearing cover plate is connected to the transition sleeve via screws, providing axial positioning for the self-lubricating bearing b. The transmission shaft sleeve is mounted on the transmission shaft via key c, and the round nut b is connected to the transmission shaft via threads, providing axial positioning for the transmission shaft sleeve.

5. The axial displacement dynamic loading test bench for the stern shaft sealing device according to claim 1, characterized in that: The axial displacement loading device consists of a hydraulic rotary joint and an axial displacement hydraulic cylinder. The cylinder body of the axial displacement hydraulic cylinder is connected to the hydraulic cylinder fixed support, and the piston rod of the axial displacement hydraulic cylinder is connected to the transmission shaft through a thread.

6. The axial displacement dynamic loading test bench for the stern shaft sealing device according to claim 1, characterized in that: The test shaft is mounted on the drive shaft, with self-lubricating bearings c and d installed between them, and the end face is connected to the drive shaft sleeve by screws.

7. The axial displacement dynamic loading test bench for the stern shaft sealing device according to claim 1, characterized in that: One end of the adapter shaft is connected to the drive shaft via a thread, and the other end is installed in the tail bearing housing assembly. The tail bearing housing assembly consists of a bearing housing, a self-aligning roller bearing, a linear slide rail assembly, and a support. The self-aligning roller bearing is heat-fitted onto the adapter shaft and installed in the bearing housing. The bearing housing is connected to the linear slide rail assembly installed on the support via bolts. The tail bearing housing assembly is radially limited but axially reciprocating.

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