Shaft apparatus and test system

Abstract

A shaft apparatus and a test system. The shaft apparatus (100) comprises: a bearing seat (1); a shaft (2), the shaft (2) penetrating through the bearing seat (1); a pair of bearings (3), the pair of bearings (3) being sleevingly disposed at the two ends of the shaft (2), respectively, and fixed between the bearing seat (1) and the shaft (2); an end fixing member (4), the shaft (2) penetrating through the end fixing member (4), and at least one end of the bearing seat (1) being fixedly provided with an end fixing member (4); and a first electromagnetic shielding member (5), the first electromagnetic shielding member (5) being clamped between at least one end fixing member (4) and the shaft (2), and used for electromagnetic shielding. The shaft apparatus has a simple mounting structure, long service life and low costs, and can implement high-speed operation and resolve the problems of static electricity and electromagnetic shielding.

Description

Axis devices and test systems

[0001] This patent application claims priority from the following Chinese patent applications:

[0002] Filing date: September 28, 2023; Application number: 2023112809891; Invention title: Axis device and test system;

[0003] The entirety of the above application is incorporated herein by reference. Technical Field

[0004] The present invention relates to the field of electromagnetic compatibility testing, and in particular to a shaft device and a testing system. Background Art

[0005] The electromagnetic compatibility test bench consists of two parts: an inner chamber and an outer chamber. These two parts are connected by a transmission component to transmit power. This transmission component must pass through the electromagnetically shielded iron walls of the darkroom. The darkroom needs to be shielded from external electromagnetic signals. To achieve this, electromagnetic leakage must be eliminated from the perforations of the transmission components and the shielded iron walls. Furthermore, the connection between the two parts of the darkroom and outer chamber must be non-conductive, meaning the two parts are insulated from each other.

[0006] In the existing technology, there are several ways to connect electromagnetic shielding through walls: Technical Solution 1, the two ends of the conventional non-insulated shielded bearing unit are connected to the two parts of the darkroom and the outside of the darkroom through a plum blossom coupling, the shielding function is achieved through a complex maze electromagnetic seal, and the insulation function is achieved through the plastic elastomer of the plum blossom coupling; Technical Solution 2, a non-metallic insulated universal shaft connects the two parts of the darkroom and the inside of the darkroom, and the shielding function is achieved through a metal shielding cover. However, in the existing Technical Solution 1, when the equipment is running at high speed, the elastomer generates static electricity, friction and wear, which is easy to produce sparks and may cause fire. In addition, the plastic deformation of the elastomer causes vibration and noise, and the plum blossom coupling needs to be replaced regularly. The universal shaft in Technical Solution 2 cannot adapt to ultra-high speeds, and the insulated universal shaft is expensive. The shielding cover structure is relatively complex and the processing cost is high, and it is difficult to install on site.

[0007] Summary of the Invention

[0008] The purpose of the present invention is to provide a shaft device and a test system, which makes the shaft device installation structure simple, has a long service life, reduces costs, realizes high-speed operation, and solves the problems of static electricity, friction wear and electromagnetic shielding.

[0009] In order to solve the above technical problems, an embodiment of the present invention provides a shaft device, comprising:

[0010] bearing housing;

[0011] a shaft, the shaft passing through the bearing seat,

[0012] A pair of bearings, wherein the pair of bearing seats are respectively sleeved on both ends of the shaft and fixed between the bearing seats and the shaft;

[0013] an end fixing member, wherein the shaft passes through the end fixing member and the end fixing member is fixed to at least one end of the bearing seat; and

[0014] A first electromagnetic shielding member is clamped between at least one of the end fixing members and the shaft and abuts against the shaft for electromagnetic shielding.

[0015] In one embodiment, the shaft has an insulating shaft body and a pair of metal shaft heads;

[0016] A pair of metal shaft heads are respectively arranged at two ends of the insulating shaft body; the first electromagnetic shielding component abuts against the metal shaft heads.

[0017] In one embodiment, there are a plurality of first electromagnetic shielding components, which are arranged along the length direction of the shaft.

[0018] In one embodiment, there are a plurality of end fixing members, and each end fixing member fixes at least one first electromagnetic shielding member.

[0019] In one embodiment, the first electromagnetic shielding component is a brush, and is sleeved on the shaft; the flexible conductive fiber component of the brush abuts against the outer circumferential surface of the shaft.

[0020] In one embodiment, the shaft device further includes: a second electromagnetic shielding member abutting against the outer circumferential surface of the shaft, wherein the second electromagnetic shielding member is located on a side of the bearing away from the center of the shaft.

[0021] In one embodiment, the shaft device further includes: an end cover, the shaft passes through the end cover, and the end cover is fixed to at least one end of the bearing seat; the second electromagnetic shielding member is clamped between the inner circular surface of the end cover and the shaft.

[0022] In one embodiment, a first electromagnetic sealing gasket is provided between the end cover and the bearing seat.

[0023] In one embodiment, the second electromagnetic shielding component and the first electromagnetic shielding component are located at the same end of the shaft; and the end cover is disposed between the end fixing component and the bearing seat.

[0024] In one embodiment, between the end cover and the bearing seat, and / or

[0025] A first electromagnetic sealing gasket is provided between the end cover and the end fixing piece.

[0026] In one embodiment, the second electromagnetic shielding component is a metal component; the second electromagnetic shielding component includes a first ring body fixed around the shaft, and a second ring body fixed around the inner circumferential surface of the end cover, and the first ring body and the second ring body are radially spaced apart.

[0027] In one embodiment, the shaft device further includes: a metal spacer and an elastic member; the metal spacer is located between the bearing seat and the shaft, at least one end of the metal spacer abuts against the elastic member, and the elastic member provides elastic force in the axial direction.

[0028] In one embodiment, the first electromagnetic shielding component and the end fixing component are sleeved on both ends of the shaft.

[0029] In one embodiment, the shaft device is used to pass through the wall of the working room and is operably fixed to the wall; wherein, the end of the shaft device located outside the working room has the first electromagnetic shielding member and the end fixing member.

[0030] In one embodiment, the bearing seat has a mounting seat protruding from its outer periphery;

[0031] The shaft device further includes: a pressure plate detachably connected to the mounting seat, and a locking member connecting the pressure plate and the mounting seat.

[0032] In one embodiment, a second electromagnetic sealing gasket is provided on a side of the pressure plate facing the mounting seat and / or a side of the mounting seat facing the pressure plate.

[0033] In one embodiment, the shaft device is used to pass through the wall of the working room;

[0034] The wall has a mounting hole, the pressure plate cooperates with the mounting seat to clamp the wall, and the locking member passes through the mounting hole and connects the pressure plate and the mounting seat;

[0035] The second electromagnetic sealing gasket is provided between the pressure plate and the wall, and / or between the mounting seat and the wall;

[0036] The second electromagnetic sealing gasket is flexible, and a spacer ring is provided between the hole wall of the mounting hole and the locking member, and the spacer ring at least partially protrudes out of the mounting hole.

[0037] An embodiment of the present invention further provides a testing system, comprising:

[0038] a first rack, the first rack being used to place a test device;

[0039] a second stand, the second stand being used for placing the piece to be tested; and

[0040] As in any one of the above shaft devices, the two ends of the shaft device are respectively used to connect the installation test equipment and the test piece.

[0041] Compared with the prior art, the embodiment of the present invention has bearing sleeves at both ends of the shaft, allowing the shaft to rotate smoothly, and the shaft can be installed on the wall of the studio through the setting of the bearing seat. The first electromagnetic shielding component is then fixed to one end of the bearing through the end fixing piece, and the first electromagnetic shielding component plays the role of conducting electricity to prevent static electricity accumulation and electromagnetic shielding. The shaft device does not have a plum blossom coupling, and will not cause vibration and noise after the plastic elastomer of the plum blossom coupling is deformed during high-speed rotation as in the prior art, and the plum blossom coupling needs to be replaced, so that the overall service life of the shaft device in this application is longer and the cost is reduced. In addition, the overall structure of the shaft device in this application is simple, it can achieve high rotation, it is also relatively convenient to install, and the processing cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0043] FIG1 is a schematic structural diagram of a shaft device according to an embodiment of the present invention;

[0044] FIG2 is a cross-sectional view of a shaft device according to an embodiment of the present invention;

[0045] FIG3 is a partial enlarged view of A in FIG2 ;

[0046] FIG4 is a partial enlarged view of B in FIG2 ;

[0047] FIG5 is a schematic structural diagram of a test system according to an embodiment of the present invention;

[0048] Description of the drawings: 100, shaft assembly; 1, bearing seat; 2, shaft; 11, main body; 12, mounting seat; 10, locking member; 21, insulating shaft; 22, metal shaft head; 3, bearing; 4, end fixing member; 5, first electromagnetic shielding member; 51, metal ring; 52, flexible conductive fiber member; 6, metal spacer; 7, elastic member; 8, end cover; 9, second electromagnetic shielding member; 91, first ring body; 92, second ring body; 101 , first electromagnetic sealing gasket; 102, second electromagnetic sealing gasket; 103, pressure plate; 104, spacer ring; 105, loading ring; 106, first mounting groove; 120, second mounting groove; 300, wall; 201, first stand; 202, second stand; 203, dynamometer; 204, torque sensor; 205, coupling; 206, constant velocity universal coupling; 207, bearing unit; 208, mounting seat for the part to be tested. DETAILED DESCRIPTION

[0049] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, each embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that in each embodiment of the present invention, many technical details are provided to help readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented.

[0050] In the following description, for the purpose of illustrating the various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0051] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and variations such as "include" and "have" should be construed in an open, inclusive sense, that is, should be interpreted to mean "including, but not limited to."

[0052] The following will describe in detail various embodiments of the present invention in conjunction with the accompanying drawings to provide a clearer understanding of the objectives, features and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0053] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0054] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise.

[0055] In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but words such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and should not be understood as restrictive terms.

[0056] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0057] The first embodiment of the present invention relates to a shaft device 100. As shown in Figure 5, shaft device 100 is used in electromagnetic compatibility testing, such as in the industrial electromechanical field, the automotive field, aerospace, shipbuilding, and military equipment fields, for example, to detect the electromagnetic compatibility performance of motors (such as new energy vehicle components and aircraft onboard components). During electromagnetic compatibility testing, the shaft device needs to pass through the wall 300 of the studio, which can be a metal wall. The studio is a darkroom. The shaft device is partially connected to the first gantry 201 outside the studio inside the studio, and partially connected to the second gantry 202 inside the studio.

[0058] As shown in Figures 1 and 2, shaft assembly 100 comprises a bearing seat 1, a shaft 2, a pair of bearings 3, an end fixture 4, and a first electromagnetic shielding member 5. Shaft 2 extends through bearing seat 1, with the pair of bearing seats 1 respectively sleeved on either end of shaft 2 and secured between the two. Shaft 2 extends through end fixture 4, which is secured to the end of bearing seat 1. First electromagnetic shielding member 5 is clamped between the inner wall of end fixture 4 and shaft 2, abutting against shaft 2 for electromagnetic shielding. It is secured by clamping the side of end fixture 4 against the side of end cap 8.

[0059] As shown in Figure 2, the left side of the wall 300 is inside the working room, and the right side in the figure is outside the working room. End fixing fixtures are fixed at both ends of the bearing seat 1, and the first electromagnetic shielding component 5 is clamped between the inner walls of the two end fixing fixtures 4 and the shaft 2.

[0060] However, in other embodiments, the end fixture 4 may be fixed to only one end of the shaft 2, and the first electromagnetic shielding element 5 may be disposed between only one end fixture 4 and the shaft. When installing the shaft assembly 100, the end with the first electromagnetic shielding element 5 may be placed outside the workstation, or the end with the first electromagnetic shielding element 5 may be placed inside the workstation. In other words, only one of the two ends of the shaft may have the first electromagnetic shielding element 5. Furthermore, if both ends of the shaft assembly 100 are provided with end fixtures 4, the first electromagnetic shielding element 5 may be disposed between only one end fixture 4 and the shaft 2.

[0061] Through the above, it is found that the bearings 3 are sleeved on both ends of the shaft 2, allowing the shaft 2 to rotate smoothly, and the setting of the bearing seat 1 allows the shaft 2 to be installed on the wall 300 of the studio. The first electromagnetic shielding member 5 is then fixed to one end of the bearing 3 by the end fixing member 4. The first electromagnetic shielding member 5 plays the role of conducting electricity to prevent static electricity accumulation and electromagnetic shielding. The shaft device does not have a plum blossom coupling 205. Unlike the prior art, the plastic elastomer of the plum blossom coupling 205 will not deform during high-speed rotation, causing vibration and noise, requiring replacement of the plum blossom coupling 205. It will also not cause fire problems caused by sparks generated by friction and wear of the plum blossom coupling 205. Therefore, the shaft device 100 in this application is safer to use, has a longer lifespan, and reduces costs. In addition, the shaft device 100 in this application has a simple overall structure, can achieve high rotation, is relatively easy to install, and reduces processing costs.

[0062] Furthermore, as shown in Figure 2, the end fixing member 4 can be a flange, and the flange is locked together with the end of the bearing seat 1 by bolts. In other embodiments, the end fixing member 4 can also be other pressing and fixing components besides the flange.

[0063] Furthermore, multiple end fixtures 4 can be provided at the same end of the shaft 2, arranged along the length of the shaft 2. In this case, a first electromagnetic shielding member 5 can be provided between each end fixture 4 and the shaft 2, with the first electromagnetic shielding member 5 being clamped and secured between two adjacent end fixtures 4, or provided between some of the end fixtures 4 and the shaft 2. It is understood that the number of end fixtures 4 at one end of the shaft 2 can be adjusted based on actual needs. Furthermore, in other embodiments, the thickness of the first electromagnetic shielding member 5 can be increased. The thickness, i.e., the length along the length of the shaft 2, can be adjusted based on actual needs, and the thickness of the corresponding end fixture 4 can also be varied.

[0064] When there are multiple end fixtures 4 at the same end of the shaft 2, an electromagnetic sealing gasket can be installed between two adjacent end fixtures 4 to prevent electromagnetic signals from penetrating the joint between the two components. The electromagnetic sealing gasket is placed around the outer circumference of the shaft 2 and can be installed in multiple locations radially spaced apart.

[0065] Furthermore, a plurality of first electromagnetic shielding members 5 may be clamped between one end fixing member 4 and the shaft 2 , and arranged along the length direction of the shaft 2 .

[0066] As shown in Figures 2 and 3 , the first electromagnetic shielding member 5 is a brush that is sleeved onto the shaft 2. The brush's flexible conductive fiber member 52 abuts against the outer circumferential surface of the shaft 2, which is the outer side surface. The brush comprises a metal ring 51, and the flexible conductive fiber member 52 is disposed around the inner surface of the metal ring 51, making full contact with the shaft 2. The flexible conductive fiber member 52 conducts electricity to prevent static electricity accumulation, grounding the shaft assembly 100 and preventing absorption of electromagnetic radiation, thus providing electromagnetic shielding.

[0067] It is worth mentioning that, as shown in FIG2 , the shaft 2 has an insulating shaft body 21 and a pair of metal shaft heads 22. The pair of metal shaft heads 22 are respectively arranged at the two ends of the insulating shaft body 21, and the first electromagnetic shielding member 5 is against the metal shaft heads 22. The metal shaft heads 22 at both ends have the characteristics of high precision, high hardness, high strength and high rigidity, and are suitable for various connection forms. The insulating shaft body 21 is made of non-metallic insulating material. The connection between the insulating shaft body 21 and the metal shaft heads 22 at both ends adopts a dual connection of mechanical connection and chemical connection, or a separate connection of mechanical connection and chemical connection. According to the connection strength requirements, anti-shear structures such as keyways and rivets can be added. The insulating shaft body 21 electrically isolates the transmission shaft systems inside and outside the working room, preventing electromagnetic signals outside the working room from entering the working room through conduction. In this embodiment, the insulation of the shaft system passing through the inside and outside of the working room is achieved by using the insulating shaft body 21 without using an insulating coupling 205, an insulating spacer ring, or an insulating pad.

[0068] Furthermore, as shown in FIG2 and FIG3 , the shaft device 100 further includes: a second electromagnetic shielding member 9 abutting against the outer circumferential surface of the shaft 2 . The second electromagnetic shielding member 9 is located on the side of the bearing 3 away from the center of the shaft, further playing the role of electromagnetic shielding.

[0069] Furthermore, as shown in Figure 2, shaft assembly 100 also includes an end cap 8, which is passed through by shaft 2. End caps 8 are secured to both ends of bearing housing 1. Second electromagnetic shielding member 9 is clamped between the inner circumference of end cap 8 and shaft 2. The inner circumference of end cap 8 is the inner wall. It is understood that in other embodiments, end cap 8 may be secured to one end of bearing housing 1. End fixture 4, end cap 8, and bearing housing 1 are secured together by bolts.

[0070] It is worth mentioning that, as shown in Figures 2 and 3, the second electromagnetic shielding member 9 and the first electromagnetic shielding member 5 are located at the same end of the shaft 2. The end cover 8 is disposed between the end fixing member 4 and the bearing seat 1. In other embodiments, the end fixing member 4 may also be disposed between the end cover 8 and the bearing seat 1.

[0071] Furthermore, as shown in Figures 2 and 3, the second electromagnetic shielding member 9 is a metal member. It comprises a first ring member 91, which is secured around the shaft 2, and a second ring member 92, which is secured around the inner circumference of the end cap 8. The first ring member 91 and the second ring member 92 are radially spaced apart. When the shaft 2 rotates, the first ring member 91 rotates with it, while the second ring member 92 remains stationary on the end cap 8. This allows relative rotation between the first and second ring members 91, 92. Both the first and second ring members 91, 92 are metal members.

[0072] In addition, as shown in Figures 2 and 3, a first electromagnetic sealing gasket 101 is provided between the end cover 8 and the bearing seat 1 to prevent electromagnetic signals from penetrating between the joint surfaces of the two components. The first electromagnetic sealing gasket 101 is sleeved around the outer circumference of the shaft 2 and can be provided in multiple numbers and radially spaced apart.

[0073] Furthermore, as shown in Figures 2 and 3, a first electromagnetic sealing gasket 101 may be provided between the end fixture 4 and the end cap 8 to prevent electromagnetic signals from penetrating the interface between the two components. The first electromagnetic sealing gasket 101 is sleeved around the outer circumference of the shaft 2 and may be provided in plurality and radially spaced apart.

[0074] In addition, as shown in Figure 2, the shaft device 100 also includes: a metal spacer 6 and an elastic member 7. The metal spacer 6 is located between the bearing seat 1 and the shaft 2. At least one end of the metal spacer 6 abuts against the elastic member 7, and the elastic member 7 provides elastic force in the axial direction. The loading ring 105 is sleeved on the left end of the shaft. The elastic member 7 can be a spring or other component sleeved on the left end of the shaft 2. One end of the elastic member 7 abuts against the metal spacer 6, and the other end abuts against the loading ring 105. The bearing 3 adopts an angular contact ball bearing 3 and is pre-tightened by the elastic member 7 and the loading ring 105, and has better high-speed characteristics. In some embodiments, the loading ring 105 and the elastic member 7 can be provided at both ends of the shaft, and are not limited to the left end as shown in the figure.

[0075] 2 and 4 , the bearing seat 1 comprises a main body 11 and a mounting seat 12 protruding from its periphery. The shaft assembly 100 further comprises a pressure plate 103 detachably connected to the mounting seat 12. The pressure plate 103 cooperates with the mounting seat 12 to clamp the wall 300.

[0076] As shown in Figures 2 and 4, the shaft device 100 further includes a locking member 10 connecting the pressure plate 103 and the mounting seat 12. The wall 300 has a mounting hole, the pressure plate 103 can be a flange, and the locking member 10 passes through the mounting hole to connect and fix the flange, the wall 300 and the mounting seat 12.

[0077] 2 and 4 , a second electromagnetic sealing gasket 102 is provided on one side of the pressure plate 103 facing the mounting seat 12 and on the other side of the mounting seat 12 facing the pressure plate 103. It is understandable that only one of the two sides of the pressure plate 103 facing the mounting seat 12 and the mounting seat 12 facing the pressure plate 103 may be provided with the second electromagnetic sealing gasket 102.

[0078] Furthermore, as shown in FIG. 2 and FIG. 4 , the shaft device 100 further includes: a spacer ring 104 disposed between the hole wall of the mounting hole and the locking member 10 , and the spacer ring 104 at least partially protrudes outside the mounting hole. As shown, a spacer ring 104 protrudes between the pressure plate 103 and the wall 300, operatively abutting the pressure plate 103. A spacer ring 104 also protrudes between the wall 300 and the mounting seat 12, operatively abutting the mounting seat 12. A second electromagnetic sealing gasket 102 is disposed between the pressure plate 103 and the wall 300, and between the mounting seat 12 and the wall 300. The second electromagnetic sealing gasket 102 is flexible, and the spacer ring 104 acts as a limiter, preventing the second electromagnetic sealing gasket 102 from being fully compressed. This allows the second electromagnetic sealing gasket 102 to maintain its elasticity and prevent electromagnetic signals from penetrating the joints between the two components. This creates a flexible connection between the bearing seat 1, the pressure plate 103, and the wall 300, preventing vibrations from the first and second gantry 201 and 202 from being transmitted to the wall 300. Since the studio is generally formed by multiple walls assembled and fixed, the connections between the walls will not easily loosen and produce gaps when no vibration is transmitted to the walls, ensuring the long-term reliable use of the studio without electromagnetic intrusion.

[0079] Understandably, in other embodiments, the second electromagnetic sealing gasket 102 may not be provided between the pressure plate 103 and the wall 300, but may be provided between the mounting base 12 and the wall 300. In this case, at least a portion of the spacer ring 104 may be provided between the mounting base 12 and the wall 300. Alternatively, the second electromagnetic sealing gasket 102 may be provided between the pressure plate 103 and the wall 300, but not between the mounting base 12 and the wall 300. In this case, at least a portion of the spacer ring 104 may be provided between the pressure plate 103 and the wall 300.

[0080] In this embodiment, the spacer ring 104 is sleeved on the locking member 10 and partially protrudes outside the mounting hole. In other embodiments, the spacer ring 104 itself may be located outside the mounting hole instead of inside the mounting hole. At this time, all the spacer rings 104 are located outside the mounting hole, and the spacer rings 104 can be against the wall 300.

[0081] Furthermore, as shown in FIG. 2 and FIG. 4 , the second electromagnetic sealing gasket 102 is disposed around the spacer ring 104 .

[0082] Preferably, as shown in FIG. 2 and FIG. 4 , the second electromagnetic sealing gasket 102 has a plurality of radial rings, and the radial rings are arranged outside the spacer ring 104 .

[0083] In addition, as shown in FIG. 2 and FIG. 4 , the pressure plate 103 has a first mounting groove 106 for mounting the first electromagnetic sealing gasket 101 , and the first electromagnetic sealing gasket 101 at least partially protrudes out of the first mounting groove 106 and abuts against the wall 300 .

[0084] In addition, as shown in FIG. 2 and FIG. 4 , the mounting base 12 has a second mounting groove 120 for mounting the second electromagnetic sealing gasket 102 , and the second electromagnetic sealing gasket 102 at least partially protrudes out of the second mounting groove 120 and abuts against the wall 300 .

[0085] Furthermore, as shown in Figures 2 and 4 , the width of the spacer ring 104 between the wall 300 and the pressure plate 103 is 0.15-0.25 cm. The width of the spacer ring 104 between the wall 300 and the pressure plate 103 is the width of the spacer ring protruding from the mounting hole toward the pressure plate to the outside of the mounting hole. Optionally, the width of the spacer ring 104 between the wall 300 and the pressure plate 103 is 0.18 cm, 0.2 cm, or 0.23 cm.

[0086] Furthermore, as shown in Figures 2 and 4 , the width of the spacer ring 104 between the wall 300 and the mounting base 12 is 0.15-0.25 cm. The width of the spacer ring 104 between the wall 300 and the mounting base 12 is defined as the width of the spacer ring protruding from the mounting hole toward the mounting base 12. Optionally, the width of the spacer ring 104 between the wall 300 and the mounting base 12 is 0.18 cm, 0.2 cm, or 0.23 cm.

[0087] It can be understood that in this embodiment, the installation structure of the mounting seat 12, the pressure plate 103, the second electromagnetic sealing gasket 102 and the spacer ring 104 and the wall 300 can be applied to other types of shaft devices, and the components for achieving electromagnetic shielding in other types of shaft devices may be different from those in this embodiment.

[0088] Another embodiment of the present invention relates to a test system. As shown in FIG5 , the test system includes: a first stand 201, a second stand 202, and an axis device 100 as described in the above embodiment. The first stand 201 is used to place the test equipment, and the second stand 202 is used to place the test piece. The two ends of the axis device are respectively used to connect and install the test equipment and the test piece. A first electromagnetic shielding component 5 is provided on at least one of the end of the axis device 100 located on the first stand 201 side and the end located on the second stand 202 side. The end of the axis device 100 located on the second stand 202 side may be provided with the first electromagnetic shielding component 5 or may not be provided with the first electromagnetic shielding component 5. In the prior art, the use of a plum blossom coupling 205 or an insulating universal shaft plus a shielding cover makes the entire transmission chain long and complicated, and the installation process is complicated, resulting in a large axial dimension of the entire test stand and a high overall cost of the test stand. The shaft device 100 in this embodiment adopts the structure of an end fixing part 4 and a first electromagnetic shielding part 5, without the plum blossom coupling 205 or the insulating universal shaft plus a shielding cover structure, thereby simplifying the transmission chain structure, simplifying the structure on the first test stand 201 and the second test stand 202, and allowing the distance between the first test stand 201 and the second test stand 202 to be closer, thereby making the test system simple, reliable and more economical.

[0089] In addition, in the prior art, an insulating shaft is passed through the wall, and the insulating shaft is covered with an electromagnetic shield. The insulating shaft needs to be connected to bearing units at both ends inside and outside the working room. The bearing unit includes a metal shaft and a bearing, and then other corresponding components are connected through the bearing units. Specifically, the dynamometer, torque sensor, coupling, first bearing unit, through-wall shaft assembly (including the insulating shaft and electromagnetic shield), second bearing unit, constant velocity universal joint, and third bearing unit can be connected in sequence on the first and second stands. In this case, the entire shaft system is relatively long, and the through-wall shaft assembly is connected to the first and second bearing units at both ends. This causes the first and second stands inside and outside the working room to be inconsistent due to the foundation's long-term settlement, resulting in the axis of the entire transmission shaft system being inconsistent. In contrast, the test system in this embodiment uses shaft device 100. The structure of shaft device 100 itself can achieve electromagnetic shielding, eliminating the need for a shielding cover, and no bearing units are required at both ends. The bearings in shaft device 100 allow shaft 2 to rotate stably, shortening the entire transmission chain and allowing shaft 2 to directly connect to the constant velocity universal joint 206 in the working room, without any impact from foundation settlement.

[0090] Taking the dynamometer 203 as an example, the left side of the test equipment is outside the workroom, and the right side is inside the workroom. Dynamometer 203 is mounted on a first frame 201, and a DUT mounting base 208 is provided on a second frame 202. From left to right, dynamometer 203, torque sensor 204, coupling 205, shaft assembly 100, constant velocity universal joint 206, bearing unit 207, and DUT are sequentially connected. The DUT is mounted on DUT mounting base 208, forming a shaft system layout. It is understood that the test system can also be used for experiments testing other parameters, and the corresponding test components can be replaced.

[0091] It is not difficult to find that this embodiment is a system embodiment corresponding to the first embodiment, and this embodiment can be implemented in conjunction with the first embodiment. The relevant technical details mentioned in the first embodiment are still valid in this embodiment, and to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied to the first embodiment.

[0092] While preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide further embodiments.

[0093] These and other changes can be made to the embodiments in light of the above detailed description.In general, in the claims, the terms used should not be construed as limited to the specific embodiments disclosed in the specification and claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which these claims are entitled.

[0094] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and that in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A shaft device, characterized in that: include: Bearing seat; a shaft, the shaft passing through the bearing seat, A pair of bearings, wherein the pair of bearing seats are respectively sleeved on both ends of the shaft and fixed between the bearing seats and the shaft; an end fixing member, the shaft passes through the end fixing member, and the end fixing member is fixed to at least one end of the bearing seat; as well as A first electromagnetic shielding member is clamped between at least one of the end fixing members and the shaft and abuts against the shaft for electromagnetic shielding.

2. The shaft device according to claim 1, characterized in that The shaft has an insulating shaft body and a pair of metal shaft heads; A pair of metal shaft heads are respectively arranged at two ends of the insulating shaft body; the first electromagnetic shielding component abuts against the metal shaft heads.

3. The shaft device according to claim 1, characterized in that There are a plurality of first electromagnetic shielding members, which are arranged along the length direction of the axis.

4. The shaft device according to claim 3, characterized in that There are a plurality of end fixing members, and each of the end fixing members at least fixes one first electromagnetic shielding member.

5. The shaft device according to claim 1, characterized in that The first electromagnetic shielding component is a brush, and is sleeved on the shaft; the flexible conductive fiber component of the brush abuts against the outer circumferential surface of the shaft.

6. The shaft device according to claim 1, characterized in that The shaft device further includes: a second electromagnetic shielding member abutting against the outer circumferential surface of the shaft, wherein the second electromagnetic shielding member is located on a side of the bearing away from the center of the shaft.

7. The shaft device according to claim 6, characterized in that The shaft device further includes: an end cover, the shaft passes through the end cover, and the end cover is fixed to at least one end of the bearing seat; the second electromagnetic shielding member is clamped between the inner circumferential surface of the end cover and the shaft.

8. The shaft device according to claim 7, characterized in that A first electromagnetic sealing gasket is arranged between the end cover and the bearing seat.

9. The shaft device according to claim 7, characterized in that The second electromagnetic shielding component and the first electromagnetic shielding component are located at the same end of the shaft; and the end cover is arranged between the end fixing component and the bearing seat.

10. The shaft device according to claim 9, characterized in that Between the end cover and the bearing seat, and / or A first electromagnetic sealing gasket is arranged between the end cover and the end fixing piece.

11. The shaft device according to claim 7, characterized in that The second electromagnetic shielding component is a metal component; the second electromagnetic shielding component comprises a first ring body fixed around the shaft, and a second ring body fixed around the inner circumferential surface of the end cover, and the first ring body is radially spaced from the second ring body.

12. The shaft device according to claim 1, characterized in that The shaft device further comprises: a metal spacer and an elastic member; the metal spacer is located between the bearing seat and the shaft, at least one end of the metal spacer abuts against the elastic member, and the elastic member provides elastic force in the axial direction.

13. The shaft device according to claim 1, wherein the first electromagnetic shielding member and the end fixing member are sleeved on both ends of the shaft.

14. The shaft device according to claim 10, characterized in that The shaft device is used to penetrate the wall of the working room and is operably fixed on the wall; wherein, the end of the shaft device located outside the working room has the first electromagnetic shielding component and the end fixing component.

15. The shaft device according to claim 1, characterized in that The bearing seat has a mounting seat protruding from its outer periphery; The shaft device further comprises: a pressure plate detachably connected to the mounting seat, and a locking member connecting the pressure plate and the mounting seat.

16. The shaft device according to claim 15, characterized in that A second electromagnetic sealing gasket is provided on a side of the pressure plate facing the mounting seat and / or on a side of the mounting seat facing the pressure plate.

17. The shaft device according to claim 16, characterized in that The shaft device is used to penetrate the wall of the studio; The wall has a mounting hole, the pressure plate cooperates with the mounting seat to clamp the wall, and the locking member passes through the mounting hole and connects the pressure plate and the mounting seat; The second electromagnetic sealing gasket is arranged between the pressure plate and the wall, and / or between the mounting seat and the wall; The second electromagnetic sealing gasket is flexible, and a spacer ring is arranged between the hole wall of the mounting hole and the locking member, and the spacer ring at least partially protrudes out of the mounting hole.

18. A testing system, characterized in that: include: A first rack, the first rack being used to place a test device; A second rack, the second rack is used to place the test piece; as well as The shaft device according to any one of claims 1 to 17, wherein both ends of the shaft device are respectively used to connect the test equipment and the test piece.

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