Electromagnetic wave shielding system of shielding room

Abstract

The invention relates to the technical field of electromagnetic wave shielding, and discloses an electromagnetic wave shielding system of a shielding room, which comprises a plurality of side wall bodies, the corner of one side wall body is sunken, the sunken side wall body comprises a front side embedded wall and a right side embedded wall, and a shielding door is arranged on the front side embedded wall; the shielding door comprises a door frame, a door leaf and a hinge assembly. The hinge assembly is located on the side, close to the right embedded wall, of the door frame. The shielding door is further provided with an auxiliary supporting mechanism, the auxiliary supporting mechanism is located below the door frame and the door leaf and comprises a rolling rail and a rolling wheel assembly, the rolling rail is designed to be in a circular arc shape, the circle center of the rolling rail coincides with the center axis of the hinge assembly, and the rolling wheel assembly is movably installed between the door leaf and the rolling rail and used for sliding along the rolling rail. The two ends of the rolling rail are fixedly connected with the front side embedded wall and the right side embedded wall correspondingly. The technical problems that the hinge joint of the upper end and the lower end of an existing shielding door is large in stress difference, and hinge joint abrasion of the lower end is easily aggravated after long-term use are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic wave shielding, and particularly to an electromagnetic wave shielding system for a shielding room. Background Art

[0002] A shielding room, as a special electromagnetic protection facility, its core structure is usually composed of metal materials to form a hexahedral shielding shell, including a top plate, wall plates, a bottom plate, and corresponding supporting keels, and undergoes strict anti-rust treatment to ensure no rusting during long-term use. These plates are mostly made of cold-rolled steel plates and are processed by precise molding and welding processes to ensure overall flatness and mechanical strength. The design of the shielding room also takes into account insulation treatment with the ground, as well as special treatment of the shielding door, ventilation window, power line, and signal line to ensure the overall shielding efficiency. The main function of the shielding room is to prevent external electromagnetic interference from entering the room and at the same time prevent the electromagnetic radiation generated by indoor electronic devices from leaking. Through multiple loss mechanisms such as absorption and reflection of incident electromagnetic waves by metal plates (or metal meshes), the shielding room can significantly reduce the energy of electromagnetic waves, thereby achieving electromagnetic wave isolation.

[0003] To ensure the shielding efficiency, the shielding door is usually made of metal materials such as copper, aluminum, steel, etc. These materials have good electrical conductivity and magnetic permeability and can effectively reflect and absorb electromagnetic radiation. However, this also results in the shielding door usually being heavier and thicker, posing higher requirements for the bearing capacity of the hinge joints.

[0004] The shielding door is often designed to be tall and large for the entry and exit of large instruments. However, this design causes different stresses on the upper and lower hinge joints. During long-term use, the lower hinge joint is prone to increased wear, resulting in the door leaf being skewed relative to the door frame. Once the gap between the door leaf and the door frame increases, the electrical connectivity will decrease, thus affecting the shielding effect. Summary of the Invention

[0005] The present invention aims to provide an electromagnetic wave shielding system for a shielding room to solve the technical problem that the stress difference between the upper and lower hinge joints of the existing shielding door is large, and the lower hinge joint is prone to increased wear during long-term use.

[0006] To achieve the above object, the present invention adopts the following technical solution: An electromagnetic wave shielding system for a shielding room includes a wall shielding body for enclosing a closed space and a shielding door provided on the wall shielding body. The wall shielding body includes a top wall body, a bottom wall body, and a plurality of side wall bodies. One side wall body corner of the wall shielding body is recessed. The recessed side wall body includes a front embedded wall and a right embedded wall. The front embedded wall and the right embedded wall are connected at a right-angle corner. The shielding door is provided on the front embedded wall.

[0007] The platform screen door includes a door frame, a door leaf and a hinge assembly. The door frame is fixedly installed on the wall. The door leaf is movably connected to the door frame through the hinge assembly, and the hinge assembly is located on the side of the door frame close to the right embedded wall. The platform screen door is also provided with an auxiliary support mechanism, which is located below the door frame and the door leaf, and includes a rolling track and a roller assembly. The rolling track is designed in an arc shape, and its center of circle coincides with the central axis of the hinge assembly. The roller assembly is movably installed between the door leaf and the rolling track for sliding along the rolling track. Both ends of the rolling track are fixedly connected to the front embedded wall and the right embedded wall respectively.

[0008] The principle and advantages of this solution are as follows: In practical applications, when the platform screen door is in the closed state, the roller assembly in the auxiliary support mechanism is located at one end of the rolling track close to the front embedded wall, providing a stable upward supporting force for the door leaf to ensure a good sealing state between the door leaf and the door frame and effectively isolate electromagnetic waves. When the platform screen door needs to be opened, the user pushes the door leaf to rotate around the hinge assembly. As the door leaf opens, the roller assembly begins to slide along the arc path of the rolling track towards the side close to the right embedded wall. The roller assembly can smoothly follow the opening and closing movements of the door leaf, maintaining the continuity and stability of the supporting force. The auxiliary support mechanism not only provides the necessary supporting force, but also realizes the dynamic balance of the door leaf during the opening process through the arc design of the rolling track and the rolling characteristics of the roller assembly. This helps to reduce the burden on the hinge assembly caused by the weight of the door leaf, extend the service life of the hinge, and improve the overall smoothness of the operation.

[0009] Preferably, as an improvement, the roller assembly includes a hub, an axle rod, a steering knuckle, a steering bearing and a fixing member. The hub is connected to the axle rod through a support bearing. The steering knuckle is a cylinder with a closed bottom end. One end of the fixing member is inserted into the top end of the steering knuckle and connected through a steering bearing. The bottom end of the steering knuckle is fixedly welded to the axle rod, and the upper end of the fixing member is fixedly connected to the door leaf.

[0010] The beneficial effect of this improvement is that as the door leaf opens, the hub smoothly rolls driven by the axle rod through the support bearing, reducing the frictional resistance during the opening process of the door leaf. The design of the steering knuckle and the steering bearing enables the hub to turn in cooperation with the rolling track, ensuring the smoothness of the opening and closing processes of the door leaf.

[0011] Preferably, as an improvement, a first reed mounting frame and a second reed mounting frame are provided on the upper edge of the door frame in a circumferential and opposite manner. Elastic reeds are arranged in sequence on the opposite side surfaces of the first reed mounting frame and the second reed mounting frame. A knife inserting frame is provided on the door leaf. When the door leaf is in a closed state, the knife inserting frame is located between the first reed mounting frame and the second reed mounting frame and is clamped by the elastic reeds on the first reed mounting frame and the second reed. The two vertical side surfaces of the first reed mounting frame, the second reed mounting frame and the knife inserting frame rotating around the hinge assembly are arc surfaces, and the central axis of the arc surface coincides with the central axis of the hinge assembly and has the same radian.

[0012] The beneficial effect of this improvement is that in the traditional design, the embedded side surfaces of the reed and the knife are straight surfaces. When the knife rotates and opens, it needs to smoothly exit from the reed, which requires that the gap between the reed mounting frame and the knife must be large enough to ensure that the end of the knife can smoothly slide out between the opposite reed mounting frames during the rotation process. This design often leads to large deformation fluctuations of the reed in the mounting frame, accelerating the fatigue damage of the reed.

[0013] In this improvement, the two vertical side surfaces of the first reed mounting frame, the second reed mounting frame and the knife inserting frame rotating around the hinge assembly adopt an arc design, and the central axis of the arc surface coincides with the central axis of the hinge assembly and has the same radian. This design enables the contact points between the knife inserting frame and the reed to change continuously during the rotation process, thereby reducing the necessary gap between the reed mounting frame and the knife. The deformation amount required for the reed when the knife is inserted and withdrawn is greatly reduced, reducing the stress fluctuation of the reed, helping to reduce the fatigue damage of the reed, and significantly extending its service life.

[0014] In the traditional design, the knife needs to penetrate deep into the reed to ensure good shielding effect. However, this design often results in poor shielding effect when the knife is not fully inserted.

[0015] In this improvement, due to the continuous change of the contact points between the reed and the knife inserting frame and the close fit of the entire insertion section of the reed and the knife, the continuity and integrity of the shielding are ensured. Even when the knife is not fully inserted, a good shielding effect can be maintained. This design improves the electromagnetic wave shielding efficiency of the shielding room and reduces the risk of electromagnetic wave leakage.

[0016] In the traditional design, the knife needs to be inserted completely to the bottom during the insertion process to ensure a tight connection with the reed. However, this design often makes it difficult for the knife to be fully aligned or inserted to the bottom during actual operation, thus affecting the shielding effect.

[0017] In this improvement, due to the tight fit between the reed and the insertion knife and the fault tolerance of the arc-shaped design, even if there are slight deviations during the insertion of the insertion knife or it is not fully inserted to the bottom, a tight connection between them can be ensured. This increases the fault tolerance rate of the system and improves the reliability and stability of use. The arc-shaped design makes the insertion knife frame rotate more smoothly during the rotation process, reducing the frictional resistance between it and the reed. This design not only improves the opening and closing efficiency of the door leaf but also reduces the noise and wear generated due to friction.

[0018] Preferably, as an improvement, the elastic reed includes a first reed and a second reed. The first reed and the second reed are arranged opposite to each other and both are formed with a first concave portion, a protruding portion, a second concave portion, and an inwardly buckled tail. The inwardly buckled tail is an arc segment that protrudes inwardly from the end of the second concave portion. The first reed and the second reed are arranged end to end. The fixed end of the first reed is close to the outer edge of the reed mounting frame, and the fixed end of the second reed is close to the inner edge of the reed mounting frame. When the relative reeds are in the free state without the insertion knife, the protruding portion of the first reed fits with the second concave portion of the second reed, and the protruding portion of the second reed fits with the second concave portion of the first reed.

[0019] The beneficial effect of this improvement is that when the door leaf is closed and the insertion knife frame is gradually inserted between the first reed mounting frame and the second reed mounting frame, the protruding portions and the inwardly buckled tails of the first reed and the second reed are in close contact with the insertion knife surface. Since the contact points between the first reed and the insertion knife and the contact points between the second reed and the insertion knife are staggered, the clamping force on the insertion knife is more evenly distributed on multiple contact points. This design not only improves the electrical connectivity between the insertion knife and the elastic reed, ensuring a good electromagnetic wave shielding effect, but also reduces the risk of damage to the insertion knife or the elastic reed caused by overly concentrated clamping force.

[0020] The elastic reed includes a first reed and a second reed, both of which are formed with a first concave portion, a protruding portion, a second concave portion, and an inwardly buckled tail. This special design enables the reed to deform when being squeezed by the insertion knife and disperses and balances the stress through the inwardly protruding state of the inwardly buckled tail. This deformation adaptability helps to reduce the stress concentration of the reed and extend its service life. In the state where the insertion knife is not inserted, the gap between the first reed and the second reed is minimized. This tight fit design reduces the possibility of impurities (such as dust, moisture, etc.) being embedded between the reeds, thereby improving the dust-proof performance of the entire door leaf.

[0021] The special design of the reed enables the plug to come into contact with and separate from the reed more smoothly during insertion and withdrawal, reducing frictional resistance and noise. This design improves the opening and closing efficiency of the door leaf and ensures the stability and reliability of the shielding effect. Due to the tight fit between the reed and the plug and the design of staggered contact points, even if there are slight deviations during the insertion of the plug or it is not fully inserted to the bottom, a tight connection between them can be guaranteed. This increases the fault tolerance rate of the system and improves the reliability and stability of use.

[0022] Preferably, as an improvement, the first reeds and the second reeds are alternately arranged on the first reed mounting frame and the second reed mounting frame.

[0023] The beneficial effect of this improvement is that during the insertion process of the plug, both sides of the plug come into contact with the protruding parts of multiple reeds simultaneously through the alternate arrangement of the first reeds and the second reeds, thereby further dispersing the contact points. This design helps to reduce the stress concentration on a single reed and prolong the service life of the reed. And it ensures that the contact between the plug and the reed during insertion is more uniform, thus improving the uniformity of the shielding effect. This helps to reduce the risk of electromagnetic wave leakage and enhance the overall shielding efficiency of the shielding room.

[0024] Preferably, as an improvement, there are two hubs, which are respectively connected to both ends of the axle rod through support bearings, and the bottom end of the steering knuckle is fixedly welded at the midpoint of the axle rod.

[0025] The beneficial effect of this improvement is that the two hubs are respectively connected to both ends of the axle rod, which can ensure that the roller assembly is more stable during rolling and reduce the shaking and deviation caused by unilateral force. This design helps to improve the stability and accuracy of the shielding door during the opening and closing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the wall shielding body.

[0027] Figure 2 It is a schematic cross-sectional structural diagram of the auxiliary support mechanism.

[0028] Figure 3 It is a schematic structural diagram of the reed in the free state.

[0029] Figure 4 It is a schematic structural diagram of the reed in the inserted state. DETAILED DESCRIPTION OF THE INVENTION

[0030] The following is a more detailed description through specific embodiments:

[0031] The reference numerals in the drawings of the specification include: front embedded wall 1, right embedded wall 2, door frame 3, door leaf 4, auxiliary support mechanism 5, rolling track 6, wheel hub 7, axle rod 8, steering knuckle 9, support bearing 10, steering bearing 11, fixing member 12, first reed mounting frame 13, second reed mounting frame 14, first reed 15, second reed 16, knife inserting frame 17, first concave portion 18, protruding portion 19, second concave portion 20 and inner locking tail 21.

[0032] Embodiment

[0033] Basically as shown in the attached Figure 1 As shown, an electromagnetic wave shielding system for a shielding room includes a wall shielding body for enclosing a closed space. The wall shielding body includes a top wall body, a bottom wall body and a plurality of side wall bodies. The top wall body and the bottom wall body are respectively fixedly connected to the top edge and the bottom edge of the side wall body. The wall shielding body encloses a rectangular configuration sunken at a corner of one side wall body. The long side wall body side of the sunken part is defined as the front side, and the opposite side that remains straight and non-sunken is defined as the rear side. The short side wall body side of the sunken part is defined as the right side, and the opposite side that remains straight and non-sunken is defined as the left side.

[0034] The side wall bodies at the corner recess of the front side and the right side include: front embedded wall 1 and right embedded wall 2. The front embedded wall 1 and the right embedded wall 2 are fixedly connected at a right-angle corner. The front embedded wall 1 is adjacent to the front wall body, and the right embedded wall 2 is adjacent to the right wall body.

[0035] A shielding door is provided on the front embedded wall 1. The shielding door includes a door frame 3, a door leaf 4 and a hinge assembly; the door frame 3 is fixedly installed on the front embedded wall 1, and the door leaf 4 is movably connected to the door frame 3 through the hinge assembly. The hinge assembly is located on the side of the door frame 3 close to the right embedded wall 2.

[0036] As shown in the attached Figure 2 As shown, the shielding door further includes an auxiliary support mechanism 5. The auxiliary support mechanism 5 is located below the door frame 3 and the door leaf 4 to provide an upward supporting force for the door leaf 4. The auxiliary support mechanism 5 includes a rolling track 6 and a roller assembly. The rolling track 6 is an arc-shaped track, and the center of the track of the rolling track 6 is located on the central axis of the hinge assembly. The two ends of the rolling track 6 are respectively fixedly connected to the front embedded wall 1 and the rear embedded wall. The roller assembly is movably installed between the door leaf 4 and the rolling track 6 for sliding along the rolling track 6.

[0037] The roller assembly includes a wheel hub 7, an axle rod 8, a steering knuckle 9, a steering bearing 11 and a fixing member 12. There are two wheel hubs 7. The two ends of the axle rod 8 respectively pass through the shaft holes of the two wheel hubs 7 and are connected to the wheel hubs 7 through support bearings 10. The steering knuckle 9 is a cylinder with a closed bottom end. One end of the fixing member 12 is inserted into the opening at the top end of the steering knuckle 9 and is adjacent through the steering bearing 11. The bottom end of the steering knuckle 9 is fixedly welded to the midpoint of the axle rod 8, and the upper end of the fixing member 12 is fixedly connected to the door leaf 4.

[0038] When the screen door is in the closed state, the roller assembly in the auxiliary support mechanism 5 is located at one end of the rolling track 6 close to the front inner wall 1. At this time, the hub 7 is tightly connected to the door leaf 4 through the axle rod 8, the steering knuckle 9 and the fixing member 12, providing a stable upward supporting force for the door leaf 4 to ensure a good sealing state between the door leaf 4 and the door frame 3 and effectively isolate electromagnetic waves.

[0039] When the screen door needs to be opened, the user pushes the door leaf 4 to rotate around the hinge assembly. As the door leaf 4 is opened, the roller assembly starts to slide along the arc path of the rolling track 6 towards the side close to the right inner wall 2. Driven by the axle rod 8, the hub 7 rolls smoothly through the support bearing 10, reducing the frictional resistance of the door leaf 4 during the opening process. The design of the steering knuckle 9 and the steering bearing 11 enables the roller assembly to smoothly follow the opening and closing movements of the door leaf 4, maintaining the continuity and stability of the supporting force. During the door opening process, the auxiliary support mechanism 5 not only provides the necessary supporting force, but also realizes the dynamic balance of the door leaf 4 during the opening process through the arc design of the rolling track 6 and the rolling characteristics of the roller assembly. This helps to reduce the burden on the hinge assembly caused by the weight of the door leaf 4, extend the service life of the hinge, and improve the overall operation fluency.

[0040] As shown in the attached Figure 3 and the attached Figure 4 As shown, the upper edge of the door frame 3 is provided with a first reed mounting frame 13 and a second reed mounting frame 14 arranged oppositely in the circumferential direction. Elastic reeds are arranged in sequence on the opposite side surfaces of the first reed mounting frame 13 and the second reed mounting frame 14. An insertion blade frame 17 is provided on the door leaf 4. When the door leaf 4 is in the closed state, the insertion blade frame 17 is located between the first reed mounting frame 13 and the second reed mounting frame 14 and is clamped by the elastic reeds thereon.

[0041] The two vertical side surfaces of the first reed mounting frame 13, the second reed mounting frame 14 and the insertion blade frame 17 that rotate around the hinge assembly are arc surfaces. The central axes of the arc surfaces of the first reed mounting frame 13, the second reed mounting frame 14 and the insertion blade frame 17 coincide with the central axis of the hinge assembly, and the radian of the arc surfaces of the first reed mounting frame 13, the second reed mounting frame 14 and the insertion blade frame 17 is the same.

[0042] In traditional designs, the embedded side surfaces of the reeds and the insertion blade are usually straight surfaces, and the insertion blade needs to penetrate deep into the reeds to ensure a good shielding effect. However, when the door leaf 4 rotates and opens, the insertion blade needs to smoothly withdraw from the reeds, which requires that the gap between the reed mounting frame and the insertion blade must be large enough to allow the end of the insertion blade to smoothly slide out between the opposite reed mounting frames during the rotation process.

[0043] In the present solution, due to the use of an arc-shaped design, the contact point between the insert blade frame 17 and the reed can change continuously during the rotation process, thereby reducing the necessary gap between the reed mounting frame and the insert blade. This means that the deformation amount required for the reed when the insert blade is inserted and withdrawn is greatly reduced, reducing the stress fluctuation of the reed. The reduced deformation fluctuation of the reed means that the stress borne by the reed is also more uniform and stable, which helps to reduce fatigue damage to the reed, thereby significantly extending its service life. Although the deformation amount of the reed is reduced, the continuous change of the contact point and the close fit between the reed and the entire insertion section of the insert blade ensure the continuity and integrity of the shielding, and a good shielding effect can be maintained even when the insert blade is not fully inserted. Due to the close fit between the reed and the insert blade, even if there is a slight deviation in the insertion process of the insert blade or it is not fully inserted to the bottom, a close connection between them can be guaranteed. This increases the fault tolerance of the system and improves the reliability and stability of use.

[0044] The elastic spring includes a first spring 15 and a second spring 16, and the first spring 15 is arranged opposite to the second spring 16. The first spring 15 and the second spring 16 are both formed with a first inner recess 18, a protruding portion 19, a second inner recess 20 and an inner buckle tail 21. The first inner recess 18, the protruding portion 19, the second inner recess 20 and the inner buckle tail 21 are sequentially connected and distributed from the fixed end to the free end of the elastic spring. The inner buckle tail 21 is an arc segment that spirals inward from the end of the second inner recess 20, and the end of the second inner recess 20 is tilted outward due to the contact between the inner buckle tail 21 and the spring installation frame. The first reed 15 and the second reed 16 are arranged end to end opposite to each other. When the relative reeds are in a free state without inserting a knife, the protrusion 19 of the first reed 15 fits with the second inner recess 20 of the second reed 16, and the protrusion 19 of the second reed 16 fits with the second inner recess 20 of the first reed 15. The fixed end of the first reed 15 is close to the outer edge of the reed installation frame, and the fixed end of the second reed 16 is close to the inner edge of the reed installation frame. The first reed 15 and the second reed 16 are alternately arranged on the first reed 15 installation frame 13 and the second reed 16 installation frame 14.

[0045] When the door leaf 4 is closed, the inserting blade frame 17 is gradually inserted between the first spring leaf 15 mounting frame 13 and the second spring leaf 16 mounting frame 14:

[0046] At the initial contact, the inserting blade frame 17 first contacts and generates a pressing force with the protrusion 19 of the first spring 15. At this time, the first spring 15 begins to deform, and its protrusion 19 is squeezed and approaches the direction of the spring installation frame.

[0047] Deformation of the first spring 15: As the inserting blade frame 17 continues to advance, the protruding portion 19 of the first spring 15 is further squeezed, causing its deformation to intensify. At the same time, the second inner recess 20 of the first spring 15 begins to tilt outward, because the contact between the inner buckle tail 21 and the spring installation frame limits the further retraction of the second inner recess 20. The inner buckle tail 21 presents a more obvious spiral protrusion state due to the tilting of the second inner recess 20.

[0048] The second reed 16 is affected: the inwardly buckled tail 21 of the first reed 15 gradually contacts the protruding portion 19 of the second reed 16 during the tilting process and generates a resisting force. At this time, the second reed 16 also begins to deform, and its protruding portion 19 is squeezed by the inwardly buckled tail 21 of the first reed 15.

[0049] The knife is fully inserted: As the knife frame 17 is continuously inserted, the knife finally contacts the protrusion 19 of the second spring 16. At this time, the knife has been fully inserted between the first spring 15 and the second spring 16, and the protrusion 19 and the inner buckle tail 21 of the elastic spring are in close contact with the knife surface.

[0050] Since the contact points between the first reed 15 and the blade and the contact points between the second reed 16 and the blade are staggered, the clamping force on the blade is more dispersedly applied to multiple contact points. This can not only improve the electrical connectivity between the blade and the elastic reed, but also reduce the risk of damage to the blade or the elastic reed due to excessive concentration of the clamping force. When the blade is not inserted, the gap between the first reed 15 and the second reed 16 is minimized. This design can reduce the possibility of impurities (such as dust, moisture, etc.) being embedded between the reeds, thereby improving the dustproof performance of the entire door leaf 4.

[0051] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An electromagnetic wave shielding system for a shielding room, comprising a wall shielding body for enclosing a closed space, and a shielding door arranged on the wall shielding body, wherein the wall shielding body comprises a top wall body, a bottom wall body and a plurality of side walls, characterized in that: A corner of a side wall of the wall shielding body is recessed, the recessed side wall includes a front embedded wall and a right embedded wall, the front embedded wall and the right embedded wall are connected at a right angle, and the shielding door is arranged on the front embedded wall; The shielding door includes a door frame, a door leaf and a hinge assembly. The door frame is fixedly installed on the wall. The door leaf is movably connected to the door frame through the hinge assembly, and the hinge assembly is located on the side of the door frame close to the right embedded wall. The shielding door is also provided with an auxiliary support mechanism, which is located below the door frame and the door leaf and includes a roller rail and a roller assembly. The roller rail is designed to be arc-shaped, and its center coincides with the central axis of the hinge assembly. The roller assembly is movably installed between the door leaf and the roller rail for sliding along the roller rail. The two ends of the roller rail are respectively fixedly connected to the front embedded wall and the right embedded wall.

2. The electromagnetic wave shielding system of a shielding room according to claim 1, characterized in that: The roller assembly includes a wheel hub, an axle rod, a steering knuckle, a steering bearing and a fixing part. The wheel hub is connected to the axle rod through a support bearing. The steering knuckle is a cylinder with a closed bottom end. One end of the fixing part is inserted into the top of the steering knuckle and is connected through the steering bearing. The bottom end of the steering knuckle is fixedly welded to the axle rod, and the upper end of the fixing part is fixedly connected to the door leaf.

3. The electromagnetic wave shielding system of a shielding room according to claim 2, characterized in that: The door frame is provided with a first reed mounting frame and a second reed mounting frame which are arranged opposite to each other in the circumferential direction, and elastic springs arranged in sequence are provided on the opposite sides of the first reed mounting frame and the second reed mounting frame, and a knife frame is provided on the door leaf. When the door leaf is in a closed state, the knife frame is located between the first reed mounting frame and the second reed mounting frame, and is clamped by the elastic springs on the first reed mounting frame and the second reed; the two vertical side surfaces of the first reed mounting frame, the second reed mounting frame and the knife frame rotating around the hinge assembly are arc surfaces, and the central axes of the arc surfaces coincide with the central axis of the hinge assembly and have the same curvature.

4. The electromagnetic wave shielding system of a shielding room according to claim 3, characterized in that: The elastic spring sheet comprises a first spring sheet and a second spring sheet, the first spring sheet and the second spring sheet are arranged opposite to each other, and both are formed with a first inner recess, a protruding portion, a second inner recess and an inner buckled tail portion, the inner buckled tail portion is a circular arc segment that spirals inwardly from the end of the second inner recess, the first spring sheet and the second spring sheet are arranged opposite to each other end to end, the fixed end of the first spring sheet is close to the outer edge of the spring sheet mounting frame, and the fixed end of the second spring sheet is close to the inner edge of the spring sheet mounting frame, when the relative spring sheets are in a free state without a knife inserted, the protruding portion of the first spring sheet fits with the second inner recess of the second spring sheet, and the protruding portion of the second spring sheet fits with the second inner recess of the first spring sheet.

5. The electromagnetic wave shielding system of a shielding room according to claim 4, characterized in that: The first reeds and the second reeds are alternately arranged on the first reed installation frame and the second reed installation frame.

6. The electromagnetic wave shielding system of a shielding room according to claim 5, characterized in that: There are two wheel hubs, which are respectively connected to the two ends of the shaft rod through supporting bearings, and the bottom end of the steering knuckle is fixedly welded to the midpoint of the shaft rod.

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