CN218002907U - Shafting radial loading device - Google Patents
Shafting radial loading device Download PDFInfo
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- CN218002907U CN218002907U CN202221031132.7U CN202221031132U CN218002907U CN 218002907 U CN218002907 U CN 218002907U CN 202221031132 U CN202221031132 U CN 202221031132U CN 218002907 U CN218002907 U CN 218002907U
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Abstract
The invention relates to a radial loading device of a shafting; the technical problems that the prior art only tests the shafting and directly or indirectly contacts with the bearing through the extension and retraction of a hydraulic cylinder or a lead screw and the like, and the acquired test signals are interfered are solved; the device comprises a radial loading mechanism, a shafting rotating mechanism, a static pressure air bearing, a data acquisition module and an industrial personal computer, wherein the radial loading mechanism comprises a support and a loading assembly arranged on the support, the loading assembly is used for providing radial loading load for a tested shafting, the loading assembly is connected with the side surface of a bearing bush of the static pressure air bearing, air inlets on two sides of the bearing bush are connected with external air inlet equipment, the shafting rotating mechanism is arranged at the lower end of the static pressure air bearing, the data acquisition module is arranged on one side of the tested shafting and used for acquiring the temperature and the vibration characteristics of the tested shafting during testing, and the industrial personal computer is arranged on one side of the radial loading mechanism and is electrically connected with the loading assembly, the shafting rotating mechanism and the data acquisition module.
Description
Technical Field
The invention relates to a shafting performance testing device, in particular to a shafting radial loading device.
Background
Along with the rapid development of high quality of high-end manufacturing industry, the requirements on the performance of a shaft system using a precision bearing are more and more strict; for example, in the case of apparatuses having a rotating mechanism such as precision machine tools, satellites, large medical instruments, etc., the performance thereof is greatly affected by the axis system used. In order to enable the equipment to run to meet the requirement of service performance and reduce the failure rate, a large amount of shafting tests are required before mass production.
The conventional test method usually only tests the bearing, but ignores the influence of the shaft and the bearing seat on the shaft system, so that the obtained test result has a certain difference from the actual product state, and the application of the traditional radial load is generally realized by directly or indirectly contacting the bearing through the expansion and contraction of a hydraulic cylinder or a lead screw and the like, so that redundant constraint can be applied to the bearing, and the interference on the acquired test signal is caused.
Disclosure of Invention
The invention aims to solve the technical problems that the existing shafting test method only has certain difference between the test result and the actual state of a bearing, and the collected test signals are interfered by the direct or indirect contact of the hydraulic cylinder or the lead screw and the like with the bearing, so that the shafting radial loading device is provided.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
a radial loading device of an axle system is characterized in that:
the device comprises a radial loading mechanism, a shafting rotating mechanism, a static pressure air bearing, a data acquisition module and an industrial personal computer;
the radial loading mechanism comprises a support and a loading assembly arranged on the support;
the loading assembly is used for providing radial loading load for the tested shaft system;
the loading assembly is connected with the side surface, close to the radial loading mechanism, of a bearing bush of the static pressure air bearing;
the air inlet holes on the two sides of the bearing bush are connected with external air inlet equipment;
the shafting rotating mechanism is used for installing a tested shafting and driving the tested shafting to rotate;
the data acquisition module is used for acquiring the temperature and vibration characteristics of the shafting to be measured during testing;
the industrial personal computer is arranged on one side of the radial loading mechanism, is electrically connected with the loading assembly, the shafting rotating mechanism and the data acquisition module, and is used for controlling the loading assembly, the shafting rotating mechanism and the data acquisition module to operate and displaying data acquired by the data acquisition module; by arranging the static pressure air bearing between the radial loading mechanism and the tested shafting, the transmission of radial load can be realized, the radial loading mechanism can not be contacted with the tested shafting, and the interference to the acquired test signal is prevented.
Further, the loading assembly comprises a tension and compression sensor, a first motor, a radial lead screw, a limiting piece and a lead screw top block;
one end of the tension and compression sensor is installed on the support, and the other end of the tension and compression sensor is connected with the first motor;
the radial lead screw is horizontally arranged, one end of the radial lead screw is coaxially connected with an output shaft of the first motor, and the other end of the radial lead screw is connected with the lead screw jacking block;
the lead screw kicking block with the axle bush is close to the side of radial loading mechanism and is connected, and the power transmission mode aim at that the loading subassembly adopted first motor and radial lead screw: the stability is good, and the torque of the measured shafting can be indirectly obtained by measuring the current flowing through the first motor, so that the torque measurement is simplified;
the limiting piece is arranged on the support, connected with the bearing bush and used for fixing the bearing bush and limiting the position of the bearing bush;
the tension and compression sensor and the first motor are electrically connected with the industrial personal computer.
Furthermore, the limiting piece comprises two radial guide rods respectively positioned at two sides of the radial lead screw and a radial sliding block positioned on each radial guide rod;
the radial guide rod is parallel to the radial lead screw;
the two radial guide rods are arranged on the support;
the radial slide blocks slide on the radial guide rods, and the two radial slide blocks are respectively connected with two sides of the bearing bush of the static pressure air bearing.
Further, the shaft system rotating mechanism comprises a base, a driving piece and a driving adapter flange;
the base is arranged below the static pressure air bearing;
the driving piece is arranged in the base, the power output end of the driving piece is connected with the lower end of the driving adapter flange, and the upper end of the driving adapter flange is used for being connected with a shaft of the tested shaft system;
the upper end of the base is used for mounting a bearing seat of a tested shaft system;
the measured shaft system is arranged on the base.
Further, the driving member comprises a second motor, a driving gear and a driven gear;
the second motor is arranged in the base, and the axis of a driving shaft of the second motor is vertically arranged;
the driving gear is coaxially connected with the driving shaft;
the driven gear is meshed with the driving gear and is coaxially arranged with the base;
the driving adapter flange is coaxially connected with the driven gear;
and the second motor is electrically connected with the industrial personal computer.
Further, the data acquisition module comprises a temperature sensor for acquiring the temperature of the measured shaft system and an acceleration sensor for acquiring the vibration characteristic of the measured shaft system;
the temperature sensor and the acceleration sensor are both arranged on the measured shafting and are both electrically connected with the industrial personal computer;
the industrial personal computer is used for collecting and displaying data measured by the temperature sensor and the acceleration sensor.
Furthermore, in order to change the load loading position of the tested shaft system, a plurality of groups of tests at different positions are carried out on the tested shaft system, and a vertical moving mechanism is also arranged;
the vertical moving mechanism comprises a third motor, an axial lead screw, an axial coupler, an axial guide rail and an axial sliding table;
the axial guide rail is vertically arranged on the support;
the axial sliding table is sleeved and connected on the axial guide rail;
the third motor is arranged on the support, one end of the axial lead screw is connected with an output shaft of the third motor through an axial coupler, and the other end of the axial lead screw penetrates through the axial sliding table and is used for driving the axial sliding table to slide along the axial guide rail;
the tension and compression sensor is connected with the axial sliding table;
the two radial guide rods are both arranged on the axial sliding table;
the third motor the industrial computer electricity is connected, and the lead screw is preferably ball, and it has advantages such as transmission efficiency is high, transmission precision is high, motion stationary, frictional force is little, long service life.
Furthermore, the driving gear and the driven gear are straight gears, the driving gear and the driven gear are arranged to be straight gears, extra axial force generated on a shafting can be further prevented, and the accuracy of a shafting measuring result is guaranteed.
Further, in order to prevent the axial sliding block from sliding out of the axial guide rail or the axial lead screw, a limiting plate is installed at the upper end of the axial guide rail and/or the upper end of the axial lead screw, and the running stability of the axial sliding block can be improved.
Furthermore, in order to ensure the running stability of the axial sliding block, the number of the axial guide rails is two, and the axial guide rails are respectively arranged on two sides of the axial sliding block;
in order to reduce the weight of the whole device and save the material cost, the axial sliding table is provided with a plurality of notches on the premise of ensuring the stable operation of the axial sliding table.
The beneficial effects of the invention are:
1. according to the axial system radial loading device, the arranged axial system rotating mechanism is used for driving the measured axial system to rotate, so that the running state of the measured axial system can be simulated during radial loading, and the measured data of the axial system is more accurate;
the loading of the radial load of the measured shaft system can be realized through the arranged radial loading mechanism;
through the static pressure air bearing, the transmission of radial load can be realized, the direct contact between the loading assembly and the measured shafting can be avoided, the loading assembly is prevented from applying redundant constraint on the measured shafting, the interference on the acquired test signal is further avoided, and the reliability and the accuracy of the measured data are ensured.
2. According to the axial system radial loading device provided by the invention, through the arrangement of the static pressure air bearing, the heat loss on the measured axial system is closer to the actual operation, and the reliability and the accuracy of measured data are further ensured.
3. According to the axial system radial loading device provided by the invention, the load loading position of the tested axial system can be changed through the vertical moving mechanism, so that a plurality of groups of tests can be carried out, the automatic control is realized, the simplicity and convenience are realized, and the test efficiency is high.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of an embodiment of the radial loading mechanism and the vertical moving mechanism of the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of a shafting rotating mechanism according to the present invention;
FIG. 4 is a schematic view of a hydrostatic air bearing embodiment of the present invention;
FIG. 5 is a schematic diagram of the structure of the shafting under test;
in the figure, 1, a radial loading mechanism; 11. a support; 17. a tension and compression sensor; 18. a first motor; 19. a radial lead screw; 110. loading the coupler; 111. a lead screw jacking block; 112. a radial guide rod; 113. a radial slider; 12. a third motor; 13. an axial lead screw; 14. an axial coupling; 15. an axial guide rail; 16. an axial sliding table; 2. a shafting rotating mechanism; 21. a base; 22. a second motor; 23. a driving gear; 24. a driven gear; 25. driving the adapter flange; 3. a static pressure air bearing; 31. a rotating shaft; 32. bearing bushes; 4. a shaft system; 41. a bearing seat; 42. a shaft; 43. a pair of bearing assemblies; 5. and an industrial personal computer.
Detailed Description
To make the objects, advantages and features of the present invention more apparent, a radial loading device for a shaft system according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The device with a rotating mechanism uses a shaft system 4 structure as shown in fig. 5, and specifically comprises a bearing seat 41, a shaft 42 and a pair of bearing assemblies 43;
the specific connection mode is as follows:
the upper and lower parts of the outer side of the shaft 42 are provided with positioning surfaces, the end surfaces of the paired bearing assemblies 43 are used as positioning surfaces, two positioning surfaces are arranged inside the lower end of the bearing block 41, and one positioning surface is arranged inside the upper end.
The paired bearing assemblies 43 are arranged inside the bearing seat 41, the upper end surfaces and the lower end surfaces of the paired bearing assemblies 43 are attached to the upper positioning surface and the lower positioning surface of the bearing seat 41, one end of the shaft 42 sequentially penetrates through the bearing seat 41 and the paired bearing assemblies 43, the positioning surface at the lower part of the shaft 42 is attached to and positioned on the other positioning surface at the lower end of the bearing seat 41, and the positioning surface at the upper part of the shaft 42 is attached to and positioned on the upper end surfaces of the paired bearing assemblies 43, so that the assembly of the measured shafting 4 is completed.
The invention relates to a shafting radial loading device which is used for testing the shafting 4 in the running state, so that the performance of the shafting 4 is judged according to the obtained related data.
As shown in fig. 1, the device specifically comprises a radial loading mechanism 1, a shafting rotating mechanism 2, a static pressure air bearing 3, a vertical moving mechanism, a data acquisition module and an industrial personal computer 5;
the functions of each mechanism are as follows:
the shafting rotating mechanism 2 is used for driving the measured shafting 4 to rotate, so that the running state of the measured shafting 4 can be simulated during radial loading, and the measured data of the shafting 4 is more accurate; the radial loading mechanism 1 can load the radial load of the measured shaft system 4; the static pressure air bearing 3 has the functions of realizing the transmission of radial load, avoiding the direct contact between the loading assembly and the tested shaft system 4, preventing the loading assembly from applying redundant constraint on the tested shaft system 4, further causing interference to the acquired test signal and ensuring the reliability and accuracy of the measured data; the vertical moving mechanism has the function of changing the load loading position of the tested shafting 4 according to the test requirement, and realizes automatic control.
As shown in fig. 4, the working principle of the static pressure air bearing 3 is that an air film generated by throttling high-pressure air supports a workpiece, so that a rotating shaft 31 of the static pressure air bearing 3 is not in contact with a bearing bush 32 when in use, and load transmission can be realized, as shown in fig. 4, the static pressure air bearing has a specific structure comprising the rotating shaft 31 and the bearing bush 32, the bearing bush 32 is sleeved outside the rotating shaft 31, the inner diameter of the bearing bush 32 is larger than the outer diameter of the rotating shaft 31, and an air inlet hole is arranged at any axisymmetrical position of the bearing bush 32.
The specific composition of each part is as follows:
as shown in fig. 2, the radial loading mechanism 1 includes a support 11 and a loading assembly, where the loading assembly includes a tension/compression sensor 17, a first motor 18, a radial lead screw 19, a loading coupler 110, a lead screw top block 111, two radial guide rods 112, and two radial sliders 113; the support 11 comprises a horizontally arranged base, a vertically arranged U-shaped frame with an upward opening and a supporting plate arranged on the U-shaped frame; the lead screw top block 111 comprises a sleeve and a fixing plate, and a thread line matched with the radial lead screw 19 is arranged inside one end, connected with the lead screw top block 111, of the sleeve.
Most preferably, the sleeve is of a telescopic structure, so that the installation accuracy of the horizontal positions of the base 21 and the screw rod top block 111 can be reduced, and after the screw rod top block 111 and the bearing bush 32 are installed, the length and the position of the screw rod top block 111 need to be fixed.
As shown in fig. 3, the shaft system rotating mechanism 2 includes a base 21, a second motor 22, a driving gear 23, a driven gear 24, and a driving adapter flange 25;
the vertical moving mechanism comprises a third motor 12, an axial lead screw 13, an axial coupler 14, an axial guide rail 15, an axial sliding table 16 and a limiting plate;
the data acquisition module comprises a temperature sensor and an acceleration sensor.
The connection mode of each part is as follows:
the U-shaped frame is installed on the base, the third motor 12 is installed on the support plate, the axis of the output shaft of the third motor 12 is vertically arranged, the output shaft of the third motor 12 is coaxially connected with the axial lead screw 13 through the axial coupler 14, the axial sliding table 16 is sleeved and connected on the axial lead screw 13 in a threaded manner, two axial guide rails 15 are vertically arranged, the lower end of each axial guide rail penetrates through the axial sliding table 16 and then is installed on the support plate, the upper end of each axial guide rail is connected with a limiting plate, the tension and compression sensor 17 is horizontally arranged, one end of each axial sliding table 16 is connected with the axial sliding table 16, the other end of each axial sliding table is connected with the first motor 18, the output end of the first motor 18 is connected with one end of the radial lead screw 19 through the loading coupler 110, the lead screw ejector block 111 at the other end of the radial lead screw 19 is connected, the two radial guide rods 112 are arranged on two sides of the first motor 18, one end of each axial sliding table 16 is installed on the radial guide rods 112 in a one-to-one manner, and can slide on the radial guide rods 112, and the two radial sliding blocks 113 are respectively installed on two sides of a bearing bush 32 of the static pressure air bearing 3.
The base 21 is installed on the base, a cavity is formed in the base, a through hole for the shaft 42 in the shaft system 4 and the driven gear 24 to penetrate through is formed in the upper end of the through hole, the base 21 is arranged on the lower portion of the radial guide rod 112, the second motor 22 is installed inside the base 21, the axis of the output shaft of the second motor 22 is vertically arranged, the output shaft of the second motor 22 is coaxially and fixedly connected with the driving gear 23, the driven gear 24 is meshed with the driving gear 23, and the driving adapter flange 25 is connected with the driven gear 24.
The temperature sensor and the acceleration sensor are both arranged on a bearing seat 41 (not shown in the figure) of the detected shaft system 4 and are both electrically connected with the industrial personal computer 5;
the driving adapter flange 25 with different lengths can be selected according to different test shafting 4, so that the driving gear 23 and the driven gear 24 are perfectly meshed; axial misalignment of the drive gear 23 and the driven gear 24 is allowed and power transfer is achieved as long as the misalignment is not 100%.
The driving gear 23 and the driven gear 24 are straight gears, and do not generate additional axial force on the measured shaft system 4.
The arrangement of the acceleration sensor can feed back the vibration characteristics of the measured shafting 4, so that whether the running state of the shafting 4 is normal can be judged.
Assembling a device before shafting 4 test:
the lower end of a shaft 42 of the measured shaft system 4 is coaxially connected with the driving adapter flange 25, the upper end of the shaft is coaxially connected with a rotating shaft 31 of the static pressure air bearing 3, and the driven gear 24 penetrates through the through hole and then is meshed with the driving gear 23; then, the lower end of the bearing seat 43 of the measured shaft system 4 is connected with the upper end of the base 21, the installation of the measured shaft system 4 is completed, the bearing bush 32 is sleeved on the rotating shaft 31, the radial sliding block 113 is fixed on the bearing bush 32, and finally high-pressure air is introduced into the static pressure air bearing 3 through the air inlet hole on the bearing bush 32, and the position of the lead screw top block 111 is adjusted to be exactly installed on the bearing bush 32.
The working principle of the loading device is as follows:
before testing, all parts are installed in place according to implementation requirements, and the change of the radial unbalance loading moment of the tested shaft system 4, the size or the direction of the radial load and the rotating speed of the tested shaft system 4 are input into the industrial personal computer 5.
During testing, high-pressure gas is introduced into the static pressure gas bearing 3, the first motor 18 and the third motor 12 start to adjust when receiving a load instruction sent by the industrial personal computer 5, at the moment, the third motor 12 drives all parts on the axial sliding table 16 to move along the axial direction of the tested shaft system 4, and meanwhile, the radial guide rod 112 drives the bearing bush 32 to move to a specified position along the axial direction; the first motor 18 rotates to drive the lead screw ejector block 111 to move forward or backward, pressure or pulling force is applied to the bearing bush 32, and finally the force is transmitted to the tested shaft system 4, and the radial guide rod 112 only plays a role in assisting and guiding in the process and cannot affect the bearing bush 32. The tension and compression sensor 17 can acquire the reaction force applied to the first motor 18 in the loading process, information is transmitted to the industrial personal computer 5, and the industrial personal computer 5 sends a feedback signal to the first motor 18 to form a closed loop, so that the load meets the requirement.
During the test, the tested shaft system 4 is not contacted with an external loading component all the time, and the information collected on the tested shaft system 4 reflects the actual working state of the shaft system 4 more truly.
Claims (10)
1. The utility model provides an axial system radial loading device which characterized in that:
the device comprises a radial loading mechanism (1), a shafting rotating mechanism (2), a static pressure air bearing (3), a data acquisition module and an industrial personal computer (5);
the radial loading mechanism (1) comprises a support (11) and a loading assembly arranged on the support (11);
the loading assembly is used for providing radial loading load for the measured shafting (4);
the loading assembly is connected with the side surface, close to the radial loading mechanism (1), of a bearing bush (32) of the static pressure air bearing (3);
the air inlet holes on the two sides of the bearing bush (32) are connected with external air inlet equipment;
the shafting rotating mechanism (2) is arranged at the lower end of the static pressure air bearing (3) and is used for installing the tested shafting (4) and driving the tested shafting (4) to rotate;
the data acquisition module is used for acquiring the temperature and vibration characteristics of the tested shafting (4) during testing;
the industrial personal computer (5) is electrically connected with the loading assembly, the shafting rotating mechanism (2) and the data acquisition module and is used for controlling the loading assembly, the shafting rotating mechanism (2) and the data acquisition module to operate and displaying data acquired by the data acquisition module.
2. The shafting radial loading device of claim 1, wherein:
the loading assembly comprises a tension and compression sensor (17), a first motor (18), a radial lead screw (19), a limiting piece and a lead screw top block (111);
one end of the tension and compression sensor (17) is arranged on the support (11), and the other end of the tension and compression sensor is connected with a first motor (18);
the radial lead screw (19) is horizontally arranged, one end of the radial lead screw is coaxially connected with an output shaft of the first motor (18), and the other end of the radial lead screw is connected with the lead screw jacking block (111);
the screw rod jacking block (111) is connected with the side face, close to the radial loading mechanism (1), of the bearing bush (32);
the limiting piece is arranged on the support (11) and connected with the bearing bush (32);
the tension and compression sensor (17) and the first motor (18) are electrically connected with the industrial personal computer (5).
3. The shafting radial loading device of claim 2, wherein:
the limiting piece comprises two radial guide rods (112) respectively positioned at two sides of the radial lead screw (19) and a radial sliding block (113) positioned on each radial guide rod (112);
the radial guide rod (112) is parallel to the radial lead screw (19);
the two radial guide rods (112) are arranged on the support (11);
the radial sliding blocks (113) slide on the radial guide rods (112), and the two radial sliding blocks (113) are respectively connected with two sides of a bearing bush (32) of the static pressure air bearing (3).
4. The shafting radial loading device of claim 3, wherein:
the shafting rotating mechanism (2) comprises a base (21), a driving piece and a driving adapter flange (25);
the base (21) is arranged below the static pressure air bearing (3);
the driving piece is arranged in the base (21), the power output end of the driving piece is connected with the lower end of the driving adapter flange (25), and the upper end of the driving adapter flange (25) is used for being connected with a shaft (42) of the measured shaft system (4);
the upper end of the base (21) is used for installing a bearing seat (41) of the tested shaft system (4).
5. The shafting radial loading device of claim 4, wherein:
the driving piece comprises a second motor (22), a driving gear (23) and a driven gear (24);
the second motor (22) is installed in the base (21), and the axis of a driving shaft of the second motor (22) is vertically arranged;
the driving gear (23) is coaxially connected with the driving shaft;
the driven gear (24) is meshed with the driving gear (23) and is coaxially arranged with the base (21);
the driving adapter flange (25) is coaxially connected with the driven gear (24);
the second motor (22) is electrically connected with the industrial personal computer (5).
6. The shafting radial loading device of claim 5, wherein:
the data acquisition module comprises a temperature sensor for acquiring the temperature of the measured shaft system (4) and an acceleration sensor for acquiring the vibration characteristic of the measured shaft system (4);
the temperature sensor and the acceleration sensor are both arranged on the measured shaft system (4) and are both electrically connected with the industrial personal computer (5);
and the industrial personal computer (5) is used for acquiring and displaying data measured by the temperature sensor and the acceleration sensor.
7. The shafting radial loading device of any one of claims 3 to 6, wherein:
the device also comprises a vertical moving mechanism;
the vertical moving mechanism comprises a third motor (12), an axial lead screw (13), an axial coupler (14), an axial guide rail (15) and an axial sliding table (16);
the axial guide rail (15) is vertically arranged on the support (11);
the axial sliding table (16) is sleeved and connected on the axial guide rail (15);
the third motor (12) is mounted on the support (11), one end of the axial lead screw (13) is connected with an output shaft of the third motor (12) through an axial coupler (14), and the other end of the axial lead screw penetrates through the axial sliding table (16) and is used for driving the axial sliding table (16) to slide along an axial guide rail (15);
the tension and compression sensor (17) is connected with the axial sliding table (16); the two radial guide rods (112) are arranged on the axial sliding table (16);
the third motor (12) is electrically connected with the industrial personal computer (5).
8. The shafting radial loading device of claim 5, wherein:
the driving gear (23) and the driven gear (24) are straight gears.
9. The shafting radial loading device of claim 7, wherein:
and a limiting plate is arranged at the upper end of the axial guide rail (15) and/or the upper end of the axial lead screw (13).
10. The shafting radial loading device of claim 7, wherein:
the number of the axial guide rails (15) is two;
the axial sliding table (16) is provided with a plurality of notches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221031132.7U CN218002907U (en) | 2022-04-29 | 2022-04-29 | Shafting radial loading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221031132.7U CN218002907U (en) | 2022-04-29 | 2022-04-29 | Shafting radial loading device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218002907U true CN218002907U (en) | 2022-12-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221031132.7U Active CN218002907U (en) | 2022-04-29 | 2022-04-29 | Shafting radial loading device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218002907U (en) |
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2022
- 2022-04-29 CN CN202221031132.7U patent/CN218002907U/en active Active
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