CN218787909U - Axial displacement dynamic loading test bed for stern shaft sealing device - Google Patents
Axial displacement dynamic loading test bed for stern shaft sealing device Download PDFInfo
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- CN218787909U CN218787909U CN202223327484.XU CN202223327484U CN218787909U CN 218787909 U CN218787909 U CN 218787909U CN 202223327484 U CN202223327484 U CN 202223327484U CN 218787909 U CN218787909 U CN 218787909U
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Abstract
The utility model relates to a stern shaft sealing device axial displacement dynamic loading test bench, driving system pass through transmission system and connect axial displacement loading system, and axial displacement loading system connects test assembly, installation stern shaft sealing device among the test assembly carries out axial displacement dynamic loading by driving system drive axial displacement loading system stern shaft sealing device among the test assembly, changes the navigational speed or receives impact load stern shaft sealing device axial displacement dynamic change when simulation boats and ships move. The test bed has a compact structure, is convenient for the disassembly of the tested stern shaft sealing device, can simulate the axial displacement change of the stern shaft sealing device when a ship changes the navigational speed or receives impact load, and carries out axial dynamic displacement loading on the stern shaft sealing device under the shafting running state. The test bed is suitable for sealing performance tests, wear performance tests and durability tests of the stern shaft sealing device in dynamic and static axial displacement loading states.
Description
Technical Field
The utility model relates to a stern shaft sealing device test bench, especially a stern shaft sealing device axial displacement dynamic loading test bench.
Background
The stern shaft sealing device is an important accessory device on a ship power system shaft system, is arranged on a stern shaft tube and a stern shaft, is an end surface mechanical sealing device for the stern shaft to penetrate through the tail part of a ship body, and has the function of isolating seawater from entering a cabin. When the ship changes the navigational speed or is subjected to impact load, the working condition of the stern shaft sealing device is the worst, and the maneuverability and the reliability of the ship can be influenced by the performance of the sealing device, so that a large number of verification tests need to be carried out on a test bed to evaluate the service performance of the stern shaft sealing device in the development stage or before the equipment leaves a factory. However, the existing test bed can only adjust the axial displacement of the stern shaft sealing device when the shaft system is static, and cannot simulate the change of the navigational speed when a ship runs or the change of the axial displacement of the stern shaft sealing device when the ship runs under impact load, for example, the test bed for the ship shaft system end face sealing device disclosed in patent publication No. CN104266799B and the test bed for the sealing performance of the stern shaft sealing device disclosed in patent publication No. CN107576490A cannot dynamically load the stern shaft sealing device under the shaft system running state.
Disclosure of Invention
The utility model aims at providing a stern shaft sealing device axial displacement developments loading test bench, this test bench can change the navigational speed when simulation boats and ships operation or the axial displacement who receives stern shaft sealing device changes, carries out the dynamic displacement loading to stern shaft sealing device under shafting running state, is applicable to stern shaft sealing device sealing performance test, wear performance test and durability test.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a dynamic axial displacement loading test bed for a stern shaft sealing device comprises a power system, a transmission system, an axial displacement loading system, a test assembly and an installation base; the dynamic system is connected with the axial displacement loading system through the transmission system, the axial displacement loading system is connected with the test assembly, the stern shaft sealing device is installed in the test assembly, the dynamic system drives the axial displacement loading system through the transmission system to dynamically load the stern shaft sealing device in the test assembly in the axial displacement mode, and the dynamic change of the axial displacement of the stern shaft sealing device caused by changing the navigational speed or impact load when a ship runs is simulated.
Furthermore, the power system consists of a motor, a starting box, a motor support, a small synchronous wheel and a synchronous belt, wherein the motor is arranged on the motor support, and the small synchronous wheel is arranged on an output shaft of the motor and is connected with a large synchronous wheel arranged on a transmission shaft system through the synchronous belt.
Furthermore, the transmission system comprises a fixed end bearing assembly, a floating end bearing assembly, a transmission shaft system and a transmission device rack, wherein the transmission shaft system is arranged on the transmission device rack through the fixed end bearing assembly and the floating end bearing assembly, and the transmission device rack is connected with the installation base through a bolt.
Further, the fixed end bearing assembly is composed of a round nut a, a spacer bush, a plane thrust ball bearing a, a plane thrust ball bearing b, a self-aligning roller bearing, a sealing cover, a positioning sleeve and a front end bearing sleeve. Round nut a, spacer bush, plane thrust ball bearing a, plane thrust ball bearing b, aligning roller bearing install in proper order on the switching axle sleeve, and round nut a passes through the screw and is connected axial fixity with the switching axle sleeve, is equipped with the position sleeve between plane thrust ball bearing a and the plane thrust ball bearing b. The sealing cover is arranged on the positioning sleeve through screws, the positioning sleeve is arranged on the front end bearing sleeve through screws, and the front end bearing sleeve is arranged on the transmission device rack through screws.
Further, the transmission shaft system is composed of a gland, a large synchronizing wheel, a key a, a switching shaft sleeve, a self-lubricating bearing a, a key b, a transmission shaft, a self-lubricating bearing b, a self-lubricating bearing cover plate, a transmission shaft sleeve, a key c and a round nut b. The large synchronizing wheel is installed on the switching shaft sleeve through a key a, a transmission shaft penetrates through the switching shaft sleeve, the switching shaft sleeve is in clearance fit with the transmission shaft, a self-lubricating bearing a and a self-lubricating bearing b are installed between the switching shaft sleeve and the transmission shaft for supporting, and torque is transmitted through a key b; the gland is connected with the large synchronizing wheel and the adapter sleeve through screws to axially limit the self-lubricating bearing a; the self-lubricating bearing cover plate is connected with the adapter sleeve through a screw to axially limit the self-lubricating bearing b; the transmission shaft sleeve is arranged on the transmission shaft through a key c, the round nut b is connected with the transmission shaft through threads, and the transmission shaft sleeve is axially limited.
Furthermore, the displacement loading system comprises a hydraulic station, an axial displacement loading device and a hydraulic cylinder fixing support, wherein a flange on one side of the hydraulic cylinder fixing support is connected with the axial displacement loading device through a bolt, and a flange on the other side of the hydraulic cylinder fixing support is connected with the large synchronizing wheel through a bolt.
Furthermore, the axial displacement loading device consists of a hydraulic rotary joint and an axial displacement hydraulic cylinder, wherein the cylinder body of the axial displacement hydraulic cylinder is connected with the hydraulic cylinder fixing support, and the piston rod of the axial displacement hydraulic cylinder is connected with the transmission shaft through threads.
Further, the test assembly comprises a simulation seawater tank, a test shaft, a transfer shaft and a tail end bearing seat set, the simulation seawater tank is installed on the installation base through bolts, the test shaft is connected with the transmission shaft system, the stern shaft sealing device is installed on the simulation seawater tank and the test shaft, the transfer shaft is connected with the transmission shaft system, and the transmission shaft system is supported through the tail end bearing seat set installed on the installation base.
Further, the test shaft is arranged on the transmission shaft, a self-lubricating bearing c and a self-lubricating bearing d are arranged between the test shaft and the transmission shaft, and the end face of the test shaft is connected with the transmission shaft sleeve through a screw.
Furthermore, one end of the adapter shaft is connected with the transmission shaft through threads, and the other end of the adapter shaft is arranged in the tail end bearing seat group; the tail end bearing seat group consists of a bearing seat, a self-aligning roller bearing, a linear slide rail group and a support, the self-aligning roller bearing is sleeved on the transfer shaft in a hot mode, the self-aligning roller bearing is installed in the bearing seat, the bearing seat is connected with the linear slide rail group installed on the support through bolts, and the tail end bearing seat group is limited in the radial direction but can move back and forth in the axial direction.
The utility model has the advantages that:
compared with the prior art, the utility model, the stern shaft sealing device axial displacement dynamic loading test bench of design compact structure, the motor is arranged side by side with transmission system, passes through synchronizing wheel and hold-in range transmission power. The utility model discloses realize axial displacement loading function based on the high accuracy pneumatic cylinder, have displacement loading response fast, advantage that control accuracy is high. The utility model discloses being equipped with switching shaft and tail end bearing frame group, not only can effectively supporting by examination stern axle sealing device, experimental axle, can conveniently dismantle when the repacking simultaneously, the repacking is efficient, maintainability is good. The utility model discloses a driving system, transmission system, axial displacement loading system, the integration of test subassembly and installation base is in coordination, realized can carrying out the loaded function of dynamic displacement to stern shaft seal device under shafting running state, the problem of changing the navigational speed or receiving impact load stern shaft seal device axial displacement dynamic change when having solved the unable simulation boats and ships operation of current test bench, also can lock transmission shafting through hydraulic pressure station valves or tail end bearing group simultaneously, it is spacing to make transmission shafting axial, only carry out static loading test to the stern shaft seal device of fixed compression volume. The test bed can be used for carrying out a sealing performance test, a wear performance test and a durability test of the stern shaft sealing device under the working condition closer to the running state of a real ship.
Drawings
Fig. 1 is a main sectional view of the axial displacement dynamic loading test bed of the stern shaft sealing device of the present invention;
fig. 2 is a top view of the axial displacement dynamic loading test bed of the stern shaft sealing device of the utility model.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, the dynamic loading test bed for axial displacement of the stern shaft sealing device comprises a starting box 1, a hydraulic station 2, a motor 3, a motor support 4, a small synchronizing wheel 5, a synchronous belt 6, a hydraulic rotary joint 7, a hydraulic cylinder 8 for axial displacement, a hydraulic cylinder fixing support 9, a gland 10, a large synchronizing wheel 11, a key a12, a self-lubricating bearing a13, a round nut a14, a sealing cover 15, a spacer bush 16, a plane thrust ball bearing a17, a positioning bush 18, a plane thrust ball bearing b19, a front end bearing bush 20, a self-aligning roller bearing 21, a transmission device rack 22, a key b23, a transmission shaft 24, a switching shaft bush 25, a self-lubricating bearing b26, a self-lubricating bearing cover plate 27, a self-lubricating bearing c28, a simulated sea water tank 29, a stern shaft sealing device 30, a test shaft 31, a self-lubricating bearing d32, a key c33, a transmission shaft bush 34, a round nut b35, a switching shaft 36, a bearing block 37, a self-aligning roller bearing 38, a linear slide rail group 39, a support 40, a mounting base 41 and the like.
The axial displacement dynamic loading test bed for the stern shaft sealing device consists of a power system, a transmission system, an axial displacement loading system, a test assembly and a mounting base 41. The power system consists of a motor 3, a starting box 1, a motor support 4, a small synchronizing wheel 5 and a synchronous belt 6, wherein the motor 3 is arranged on the motor support 4, the small synchronizing wheel 5 is arranged on an output shaft of the motor and is connected with a large synchronizing wheel 11 arranged on a transmission shaft system through the synchronous belt 6 to provide power for the transmission shaft system; the motor 3 and the transmission shaft system are arranged side by side, and the structure is compact.
The transmission system comprises a fixed end bearing assembly, a floating end bearing assembly, a transmission shaft system and a transmission device rack 22, wherein the transmission shaft system is installed on the transmission device rack 22 through the fixed end bearing assembly and the floating end bearing assembly, and the transmission device rack 22 is connected with the installation base 41 through bolts. The fixed end bearing assembly consists of a round nut a14, a spacer 16, a plane thrust ball bearing a17, a plane thrust ball bearing b19, a self-aligning roller bearing 21, a sealing cover 15, a positioning sleeve 18 and a front end bearing sleeve 20. The round nut 14, the spacer 16, the plane thrust ball bearing a17, the plane thrust ball bearing b19 and the self-aligning roller bearing 21 are sequentially installed on the adapter sleeve 25, the round nut a14 is connected with the adapter sleeve 25 through threads and fixed in the axial direction, the spacer 16 is installed between the round nut a14 and the plane thrust ball bearing a17 for limiting, and the positioning sleeve 18 is installed between the plane thrust ball bearing a17 and the plane thrust ball bearing b 19. The sealing cover is mounted on a positioning sleeve 18 through screws, the positioning sleeve 18 is mounted on a front end bearing sleeve 20 through screws, and the front end bearing sleeve 20 is mounted on a transmission rack 22 through screws. The fixed end bearing assembly can bear larger radial force and axial force through the combined use and special structure of the bearing, and effectively supports the weight of a transmission shaft system and the axial force during axial displacement loading.
The transmission shaft system comprises a gland 10, a large synchronizing wheel 11, a key a12, a transfer shaft 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 b 35. The large synchronous wheel 11 is arranged on a switching shaft sleeve 25 through a key a12 and used for transmitting power, a transmission shaft 24 penetrates through the switching shaft sleeve 25, the switching shaft sleeve 25 is in clearance fit with the transmission shaft 24, a self-lubricating bearing a13 and a self-lubricating bearing b26 are arranged between the switching shaft sleeve 25 and the transmission shaft 24 for supporting, and torque is transmitted through a key b 23; due to the special properties of the self-lubricating bearing a13 and the self-lubricating bearing b, the transmission shaft 24 can not only rotate, but also reciprocate in a rotating state; the gland 10 is connected with the large synchronizing wheel 11 and the adapter sleeve 25 through screws, and axially limits the self-lubricating bearing a13; the self-lubricating bearing cover plate 27 is connected with the adapter sleeve 25 through a screw to axially limit the self-lubricating bearing b26; the driving shaft sleeve 34 is arranged on the driving shaft 24 through a key c33, and the round nut b35 is connected with the driving shaft 24 through threads to axially limit the driving shaft sleeve 34. The transmission shaft 24 transmits power to the transmission shaft sleeve 34 through the key c33, and the transmission shaft sleeve 34 drives the test shaft 31 to rotate and reciprocate.
The displacement loading system comprises a hydraulic station 2, an axial displacement loading device and a hydraulic cylinder fixing support 9, wherein a flange on one side of the hydraulic cylinder fixing support 9 is connected with the axial displacement loading device through a screw, and a flange on the other side of the hydraulic cylinder fixing support 9 is connected with a large synchronizing wheel 11 through a screw. The axial displacement loading device is composed of a hydraulic rotary joint 7 and an axial displacement hydraulic cylinder 8, the axial displacement hydraulic cylinder 8 is connected with a hydraulic cylinder fixing support 9, and a piston rod of the axial displacement hydraulic cylinder 8 is connected with a transmission shaft 24 through threads. The hydraulic station 2 supplies pressure oil with controllable pressure and flow to the hydraulic rotary joint 7, the hydraulic rotary joint 7 is static, the axial displacement hydraulic cylinder 8 rotates along with the transmission shaft 24, and the hydraulic rotary joint 7 with a special structure can supply the pressure oil to the axial displacement hydraulic cylinder 8, so that a piston rod of the axial displacement hydraulic cylinder 8 reciprocates in a rotating state.
The test assembly comprises a simulation sea water tank 29, a test shaft 31, an adapter shaft 36 and a tail end bearing seat group, wherein the simulation sea water tank 29 is installed on an installation base 41 through bolts, the test shaft 31 is connected with a transmission shaft system, a stern shaft sealing device 30 is installed on the simulation sea water tank 29 and the test shaft 36, the adapter shaft 36 is connected with the transmission shaft system, and the transmission shaft system is supported through the tail end bearing seat group installed on the installation base 41. The tail end bearing seat group consists of a bearing seat 37, a self-aligning roller bearing 38, a linear slide rail group 39 and a support 40, the self-aligning roller bearing 38 is sleeved on the adapter shaft 36 in a hot mode, the self-aligning roller bearing 38 is installed in the bearing seat 37, the bearing seat 37 is connected with the linear slide rail group 39 installed on the support 40 through bolts, the tail end bearing seat group can move in a reciprocating mode in the radial direction and the axial direction, the supporting effect is achieved, and meanwhile when the bearing seat group is replaced, the bearing seat group can be detached conveniently, replacing efficiency is high, and maintainability is good.
The working principle of the axial displacement dynamic loading test bed for the stern shaft sealing device is that the starting box 1 controls the rotation of the motor 3 and the pressure and flow of hydraulic oil of the hydraulic station 2, and the power of the motor 3 is transmitted to the transmission shaft 24 through the small synchronizing wheel 5, the synchronous belt 6 and the large synchronizing wheel 11 to drive the transmission shaft 24 to rotate. The hydraulic station 2 supplies controllable pressure oil to the axial displacement hydraulic cylinder body 8 through the hydraulic rotary joint 7, and the piston rod of the axial displacement hydraulic cylinder body 8 is connected with the transmission shaft 24 through threads, so that the transmission shaft 24 can be driven to axially reciprocate. The adapter sleeve 25 is mounted on the transmission rack 22 through a fixed end bearing assembly and a floating end bearing assembly while being stationary, and a self-lubricating bearing a13 and a self-lubricating bearing b are mounted between the adapter sleeve 25 and the transmission shaft 24, so that the transmission shaft 24 can rotate and axially reciprocate relative to the adapter sleeve 25. The transmission shaft 24 transmits power to the transmission shaft sleeve 34 through the key c33, and the transmission shaft sleeve 34 drives the test shaft 31 to rotate and reciprocate. The stern shaft sealing device 30 is arranged on the simulated seawater tank 29 and the test shaft 36, the simulated seawater tank 29 is static and motionless, the test shaft 36 can rotate and reciprocate relative to the simulated seawater tank 29, and the part of the stern shaft sealing device 30 arranged on the test shaft 36 can rotate and reciprocate relative to the simulated seawater tank 29. The transfer shaft 36 is connected to the drive shaft, and supports the drive shaft via a tail-end bearing block set mounted on the mounting base 41, which is radially limited but axially movable in a reciprocating manner. In conclusion, the axial displacement dynamic loading test bed for the stern shaft sealing device can dynamically load the stern shaft sealing device in the axial displacement state, change the navigation speed or dynamically change the axial displacement of the stern shaft sealing device under the impact load when a ship operates in a simulated mode, and simultaneously lock a transmission shaft through a hydraulic station valve bank or a tail end bearing block group, so that the transmission shaft is axially limited, and only the stern shaft sealing device with fixed compression amount is subjected to a static loading test. The test bed can be used for carrying out a sealing performance test, a wear performance test and a durability test of the stern shaft sealing device under the working condition closer to the running state of a real ship.
Claims (10)
1. The utility model provides a stern shaft sealing device axial displacement dynamic loading test bench which characterized in that: the device comprises a power system, a transmission system, an axial displacement loading system, a test assembly and an installation base; the dynamic system is connected with the axial displacement loading system through the transmission system, the axial displacement loading system is connected with the test assembly, the stern shaft sealing device is installed in the test assembly, the dynamic system drives the axial displacement loading system through the transmission system to dynamically load the stern shaft sealing device in the test assembly in the axial displacement mode, and the dynamic change of the axial displacement of the stern shaft sealing device caused by changing the navigational speed or impact load when a ship runs is simulated.
2. The axial displacement dynamic loading test bed for the stern shaft sealing device according to claim 1, wherein: the power system consists of a motor, a starting box, a motor support, a small synchronizing wheel and a synchronous belt, wherein the motor is arranged on the motor support, and the small synchronizing wheel is arranged on an output shaft of the motor and is connected with a large synchronizing wheel arranged on a transmission shaft system through the synchronous belt.
3. The axial displacement dynamic loading test bed for the stern shaft sealing device according to claim 1, wherein: the transmission system comprises a fixed end bearing assembly, a floating end bearing assembly, a transmission shaft system and a transmission device rack, wherein the transmission shaft system is installed on the transmission device rack through the fixed end bearing assembly and the floating end bearing assembly, and the transmission device rack is connected with the installation base through a bolt.
4. The axial displacement dynamic loading test bed for the stern shaft sealing device according to claim 3, wherein: the fixed end bearing assembly consists of a round nut a, a spacer bush, a plane thrust ball bearing a, a plane thrust ball bearing b, a self-aligning roller bearing, a sealing cover, a positioning sleeve and a front end bearing sleeve; the round nut a, the spacer bush, the planar thrust ball bearing a, the planar thrust ball bearing b and the self-aligning roller bearing are sequentially arranged on the switching shaft sleeve, the round nut a is connected with the switching shaft sleeve through threads and axially fixed, and a positioning sleeve is arranged between the planar thrust ball bearing a and the planar thrust ball bearing b; the sealing cover is arranged on the positioning sleeve through screws, the positioning sleeve is arranged on the front end bearing sleeve through screws, and the front end bearing sleeve is arranged on the transmission device rack through screws.
5. The axial displacement dynamic loading test bed for the stern shaft sealing device according to claim 3, wherein: the transmission shaft system consists of a gland, a large synchronizing wheel, a key a, a switching shaft sleeve, a self-lubricating bearing a, a key b, a transmission shaft, a self-lubricating bearing b, a self-lubricating bearing cover plate, a transmission shaft sleeve, a key c and a round nut b; the large synchronizing wheel is installed on the switching shaft sleeve through a key a, a transmission shaft penetrates through the switching shaft sleeve, the switching shaft sleeve is in clearance fit with the transmission shaft, a self-lubricating bearing a and a self-lubricating bearing b are installed between the switching shaft sleeve and the transmission shaft for supporting, and torque is transmitted through a key b; the gland is connected with the large synchronizing wheel and the adapter sleeve through screws to axially limit the self-lubricating bearing a; the self-lubricating bearing cover plate is connected with the adapter sleeve through a screw to axially limit the self-lubricating bearing b; the transmission shaft sleeve is arranged on the transmission shaft through a key c, the round nut b is connected with the transmission shaft through threads, and the transmission shaft sleeve is axially limited.
6. The axial displacement dynamic loading test bed for the stern shaft sealing device according to claim 1, wherein: the displacement loading system comprises a hydraulic station, an axial displacement loading device and a hydraulic cylinder fixing support, wherein a flange on one side of the hydraulic cylinder fixing support is connected with the axial displacement loading device through a bolt, and a flange on the other side of the hydraulic cylinder fixing support is connected with a large synchronizing wheel through a bolt.
7. The axial displacement dynamic loading test bed for the stern shaft sealing device according to claim 6, wherein: the axial displacement loading device consists of a hydraulic rotary joint and an axial displacement hydraulic cylinder, wherein the cylinder body of the axial displacement hydraulic cylinder is connected with the hydraulic cylinder fixing support, and the piston rod of the axial displacement hydraulic cylinder is connected with the transmission shaft through threads.
8. The axial displacement dynamic loading test bed for the stern shaft sealing device according to claim 1, wherein: the test assembly comprises a simulated seawater tank, a test shaft, a transfer shaft and a tail end bearing seat group, the simulated seawater tank is installed on the installation base through bolts, the test shaft is connected with the transmission shaft system, a stern shaft sealing device is installed on the simulated seawater tank and the test shaft, the transfer shaft is connected with the transmission shaft system, and the transmission shaft system is supported through the tail end bearing seat group installed on the installation base.
9. The axial displacement dynamic loading test bed for the stern shaft sealing device according to claim 8, wherein: the test shaft is arranged on the transmission shaft, a self-lubricating bearing c and a self-lubricating bearing d are arranged between the test shaft and the transmission shaft, and the end face of the test shaft is connected with the transmission shaft sleeve through a screw.
10. The axial displacement dynamic loading test bed for the stern shaft sealing device according to claim 8, wherein: one end of the adapter shaft is connected with the transmission shaft through threads, and the other end of the adapter shaft is arranged in the tail end bearing seat group; the tail end bearing seat group consists of a bearing seat, a self-aligning roller bearing, a linear slide rail group and a support, the self-aligning roller bearing is sleeved on the transfer shaft in a hot mode, the self-aligning roller bearing is installed in the bearing seat, the bearing seat is connected with the linear slide rail group installed on the support through bolts, and the tail end bearing seat group is limited in the radial direction but can move back and forth in the axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223327484.XU CN218787909U (en) | 2022-12-12 | 2022-12-12 | Axial displacement dynamic loading test bed for stern shaft sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223327484.XU CN218787909U (en) | 2022-12-12 | 2022-12-12 | Axial displacement dynamic loading test bed for stern shaft sealing device |
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| Publication Number | Publication Date |
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| CN218787909U true CN218787909U (en) | 2023-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223327484.XU Active CN218787909U (en) | 2022-12-12 | 2022-12-12 | Axial displacement dynamic loading test bed for stern shaft sealing device |
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| CN (1) | CN218787909U (en) |
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2022
- 2022-12-12 CN CN202223327484.XU patent/CN218787909U/en active Active
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