Magnetic shielding effectiveness testing device
By introducing guide brackets and lifting drive components into the magnetic shielding performance testing device, the controllable opening and closing of the upper and lower test components is achieved, solving the problems of low test efficiency and inaccurate results in the existing devices, and improving operational convenience and testing accuracy.
Patent Information
- Application Number
- CN202422359266.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2034-09-26
AI Technical Summary
During the operation of the existing magnetic shielding performance test device, the test terminals are inconvenient to open and close, resulting in low testing efficiency and difficult to avoid air gap formation, affecting the accuracy of the test results.
A magnetic shielding performance testing device is designed, using a guide bracket and a lifting drive assembly to realize the controllable opening and closing control between the upper test assembly and the lower test assembly. The test piece is stably clamped through the lifting drive assembly to avoid the formation of air gaps.
It improves the convenience and accuracy of test operations, reduces the operating burden, and ensures the stability and accuracy of test results.
Smart Images
Figure CN223205570U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of effectiveness testing devices, and in particular relates to a magnetic shielding effectiveness testing device. Background Art
[0002] The test objects for magnetic shielding effectiveness testing include shielding fabrics, metal sheets, surface coatings or platings of non-conductive materials, metal meshes, conductive films, conductive glass and conductive rubber, etc. The magnetic shielding effectiveness of the above objects is tested within a certain test frequency range. The methods for magnetic shielding effectiveness testing generally include the flange coaxial method, the small window method and the shielded room method, among which the flange coaxial method is the more commonly used method. When using the flange coaxial method for magnetic shielding effectiveness testing, the test piece of the test object is clamped between two test terminals. The test terminals are connected to the vector network analyzer through lead cables. The signal is sent through one test terminal and received through the other test terminal. The change in signal strength is used to evaluate the magnetic shielding effectiveness of the test object.
[0003] To obtain more accurate magnetic shielding effectiveness test results, it is typically necessary to produce multiple test pieces for the same test object and conduct repeated tests. Therefore, performing magnetic shielding effectiveness testing is an ongoing process. Existing magnetic shielding effectiveness test devices have inconvenient opening and closing operations between the two test terminals, which reduces test efficiency. Furthermore, each time a test piece is replaced after a test, the test terminals must be moved and reset. Existing manual operation methods make it difficult to ensure that there is no air gap between the test terminals, resulting in inaccurate test results.
[0004] In summary, it is necessary to develop and design a new type of magnetic shielding effectiveness testing device to solve the above-mentioned technical problems. Utility Model Content
[0005] The purpose of the utility model is to provide a magnetic shielding effectiveness testing device, which improves the convenience of test operation and improves the accuracy of test results by avoiding the formation of air gaps.
[0006] The technical solution adopted by the utility model is: a magnetic shielding effectiveness testing device, including a cabinet, a guide bracket is installed on the top of the cabinet, a fixed upper test component is installed on the top of the guide bracket, a lifting lower test component is installed on the lower part of the guide bracket, a lifting drive component for driving the lower test component to move up and down is also installed in the cabinet, a vector network analyzer is also installed on the cabinet, and the upper test component and the lower test component are respectively connected to the vector network analyzer through lead cables; the lifting drive component includes a back support plate and a front support plate, a rotating wheel with a side wall driven by a driving mechanism is installed on the front support plate, a base with a guide hole is also installed on the front support plate, a support rod is provided in the guide hole, a lower end block with a protrusion on the side is installed at the lower end of the support rod, and the protrusion is located in the slide, a lifting block is fixed in the middle of the support rod, a connecting seat is installed on the side of the lifting block, and a lifting support plate is installed on the connecting seat.
[0007] Preferably, a buffer mechanism is also installed between the connecting seat and the lifting block, and the buffer mechanism includes a horizontal guide hole arranged on the lifting block, a guide rod is installed in the guide hole, the connecting seat is fixedly connected to the rear end of the guide rod, an end plate is installed at the front end of the guide rod, and a buffer spring is provided between the end plate and the lifting block.
[0008] Preferably, the driving mechanism includes a driving motor installed and fixed on the side of the front support plate, and a driving shaft installed on the side of the front support plate, the rotating wheel is installed and fixed on the lower end of the driving shaft, a driving pulley is installed on the output shaft of the driving motor, and a driven pulley is installed on the upper end of the driving shaft, and the driving pulley and the driven pulley are connected by belt drive.
[0009] Preferably, a detection probe is further installed in the middle of the side of the front support plate, and a positioning plate that cooperates with the detection probe is installed in the middle of the drive shaft.
[0010] Preferably, the guide-type bracket includes a plurality of vertical guide columns, a top plate is installed at the upper end of each guide column, a bottom plate is installed at the lower end, a guide sleeve is installed in the middle of each guide column, a lifting upper plate is installed at the upper end of each guide sleeve, and a lifting lower plate is installed at the lower end, the upper test assembly is installed and fixed in the middle of the top plate, the lower test assembly is installed and fixed in the middle of the lifting upper plate, the bottom plate is fixedly connected to the cabinet body, and the lifting support plate of the lifting drive assembly extends upward from a window set in the middle of the bottom plate and is fixedly connected to the lifting lower plate.
[0011] Preferably, the upper test assembly includes an upper test seat fixed to the top plate, an upper test terminal is installed at the bottom of the upper test seat, and an upper N-type connector connected to the upper test terminal is installed at the top; the lower test assembly includes a lower test seat fixed to the lifting upper plate, a lower test terminal is installed at the top of the lower test seat, and a lower N-type connector connected to the lower test terminal is installed at the bottom.
[0012] The advantages and positive effects of the utility model are:
[0013] The present invention provides a magnetic shielding effectiveness test device with a reasonable structural design. Compared with the existing magnetic shielding effectiveness test device, the effectiveness test device in the present invention realizes controllable opening and closing between the upper test component and the lower test component by providing a guide bracket and installing the upper test component on the top of the guide bracket, while allowing the lower test component to move up and down under the driving action of the lifting drive component, thereby reducing the operating burden of the test personnel when performing the magnetic shielding effectiveness test and improving the efficiency of the test operation. The lower test component in the present invention is driven to move up and down by the lifting drive component. During the test, the test piece of the test object is placed on the lower test component. The lifting drive component drives the lower test component to move upward until it abuts against the lower test device. The test piece is then stably and effectively clamped between the two test components, effectively avoiding the formation of an air gap between the two test components, which can improve the accuracy of the results of the magnetic shielding effectiveness test. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the main perspective structure of the utility model;
[0015] Figure 2 yes Figure 1 Schematic diagram of the structure of the lifting drive assembly;
[0016] Figure 3 yes Figure 1 Schematic diagram of the structure of the lifting drive assembly;
[0017] Figure 4 yes Figure 1 Schematic diagram of the main structure of the middle guide bracket, upper test assembly, and lower test assembly.
[0018] In the picture:
[0019] 1. Cabinet; 2. Lifting drive assembly; 2-1. Back support plate; 2-2. Front support plate; 2-3. Support rod; 2-4. Lifting block; 2-5. Buffer mechanism; 2-6. Base; 2-7. Connecting seat; 2-8. Lifting support plate; 2-9. Rotating wheel; 2-10. Slide; 2-11. Detection probe; 2-12. Driving motor; 2-13. Belt; 2-14. Driving pulley; 2-15. Driven pulley; 3. Guide bracket; 3-1, top plate; 3-2, guide column; 3-3, upper lifting plate; 3-4, guide sleeve; 3-5, lower lifting plate; 3-6, bottom plate; 4, upper test assembly; 4-1, upper N-type connector; 4-2, upper test socket; 4-3, upper test terminal; 5, lower test assembly; 5-1, lower N-type connector; 5-2, lower test socket; 5-3, lower test terminal; 6, lead cable; 7, vector network analyzer. DETAILED DESCRIPTION
[0020] In order to further understand the content, features and effects of the present invention, the following embodiments are given to illustrate in detail.
[0021] See Figure 1 The magnetic shielding effectiveness test device of the present invention includes a cabinet 1, a guide bracket 3 is installed on the top of the cabinet 1, a fixed upper test component 4 is installed on the top of the guide bracket 3, and a lifting lower test component 5 is installed at the bottom of the guide bracket 3. A vector network analyzer 7 is also installed on the cabinet 1, and the upper test component 4 and the lower test component 5 are respectively connected to the vector network analyzer 7 through a lead cable 6.
[0022] The guide bracket 3 is used to support the upper test assembly 4 and the lower test assembly 5, while also providing stable guidance for the lower test assembly 5, ensuring that the lower test assembly 5 maintains accurate vertical alignment with the upper test assembly 4 during its lifting and displacement. The vector network analyzer 7 is used to control the transmission and reception of signals from the upper and lower test assemblies 4 and 5, and to determine the magnetic shielding effectiveness of the current test object by comparing the transmitted and received signals. The vector network analyzer 7 is an existing instrument, purchased. This patent does not involve improvements to the vector network analyzer 7, and therefore its structure and function are not described in detail.
[0023] See Figure 4 , we can see that:
[0024] The guide bracket 3 includes a plurality of vertical guide columns 3-2, with a top plate 3-1 mounted on the upper end of each guide column 3-2 and a bottom plate 3-6 mounted on the lower end. A guide sleeve 3-4 is mounted in the middle of each guide column 3-2, and a lifting upper plate 3-3 is mounted on the upper end of each guide sleeve 3-4 and a lifting lower plate 3-5 is mounted on the lower end. The upper test assembly 4 is mounted and fixed in the middle of the top plate 3-1, the lower test assembly 5 is mounted and fixed in the middle of the lifting upper plate 3-3, and the bottom plate 3-6 is fixedly connected to the cabinet 1. The lifting upper plate 3-3, the lifting lower plate 3-5 and the guide sleeves 3-4 together constitute a lifting platform. The lower test assembly 5 located on this lifting platform can be lifted and lowered in the vertical direction, and the upper test assembly 4 does not change position.
[0025] In this embodiment, the upper test assembly 4 includes an upper test socket 4-2 fixed to the top plate 3-1, with an upper test terminal 4-3 installed at the bottom of the upper test socket 4-2 and an upper N-type connector 4-1 connected to the upper test terminal 4-3 installed at the top. The upper N-type connector 4-1 is selected as a female connector, and a male connector is provided at the end of the lead cable 6 to achieve a plug-in connection. In this embodiment, the lower test assembly 5 includes a lower test socket 5-2 fixed to the upper lifting plate 3-3, with a lower test terminal 5-3 installed at the top of the lower test socket 5-2 and a lower N-type connector 5-1 connected to the lower test terminal 5-3 installed at the bottom. The lower N-type connector 5-1 is selected as a female connector, and a male connector is provided at the end of the lead cable 6 to achieve a plug-in connection.
[0026] The structures of the upper test terminal 4-3 and the lower test terminal 5-3 are the same as the test terminal structures of the existing magnetic shielding effectiveness test device. Specifically, the upper test terminal 4-3 and the lower test terminal 5-3 both structurally include an outer conductor flange and an inner conductor made of metal material (such as brass), and a polytetrafluoroethylene support ring is filled between the outer conductor flange and the inner conductor. The structure is consistent with the flange coaxial structure adopted in standards such as GB / T30142-2013. This patent does not involve improvements to the structures and functions of the upper test terminal 4-3 and the lower test terminal 5-3.
[0027] A lifting drive assembly 2 is also installed in the cabinet 1 to drive the lower test assembly 5 to move up and down.
[0028] See Figure 2 and Figure 3 , we can see that:
[0029] The lifting drive assembly 2 includes a back support plate 2-1 and a front support plate 2-2. A rotating wheel 2-9 with a sidewall having a slideway 2-10 is mounted on the front support plate 2-2 and driven by a drive mechanism. Also mounted on the front support plate 2-2 is a base 2-6 with a guide hole. A support rod 2-3 is disposed within the guide hole. A lower end block with a side bump is mounted at the lower end of the support rod 2-3. The bump is located within the slideway 2-10. When the rotating wheel 2-9 rotates, the bump remains within the slideway 2-10 and moves. The slideway 2-10 has a low position and a high position, with a smooth transition between the low and high positions. Thus, when the rotating wheel 2-9 rotates, as the slideway 2-10 moves from one position to the other, the bump drives the lower end block to move up and down, correspondingly causing the support rod 2-3 and its associated components to move up and down.
[0030] In this embodiment, the driving mechanism includes a driving motor 2-12 installed and fixed on the side of the front support plate 2-2, and a driving shaft installed on the side of the front support plate 2-2. The pulley 2-9 is installed and fixed on the lower end of the driving shaft. A driving pulley 2-14 is installed on the output shaft of the driving motor 2-12, and a driven pulley 2-15 is installed on the upper end of the driving shaft. The driving pulley 2-14 and the driven pulley 2-15 are connected by a belt 2-13.
[0031] A lifting block 2-4 is fixed to the middle of the support rod 2-13. A connecting seat 2-7 is mounted on the side of the lifting block 2-4. A lifting support plate 2-8 is mounted on the connecting seat 2-7. The lifting support plate 2-8 of the lifting drive assembly 2 extends upward through a window provided in the middle of the bottom plate 3-6 of the guide bracket 3 and is fixedly connected to the lifting lower plate 3-5. When the support rod 2-3 moves up and down, the lifting block 2-4 moves up and down accordingly.
[0032] In this embodiment, a buffer mechanism 2-5 is further installed between the connecting seat 2-7 and the lifting block 2-4. The buffer mechanism 2-5 comprises a horizontal guide hole provided on the lifting block 2-4, within which a guide rod is mounted. The connecting seat 2-7 is fixedly connected to the rear end of the guide rod, and an end plate is mounted at the front end of the guide rod, with a buffer spring provided between the end plate and the lifting block. The provision of the buffer mechanism 2-5 between the connecting seat 2-7 and the lifting block 2-4 effectively prevents obstruction to the lifting and lowering drive of the lifting platform and the lower test assembly 5.
[0033] In this embodiment, a detection probe 2-11 is further mounted in the middle of the side of the front support plate 2-2, and a positioning plate that cooperates with the detection probe 2-11 is mounted in the middle of the drive shaft. Specifically, the detection probe 2-11 is a photoelectric probe with a groove in the middle. During the rotation of the drive shaft, the positioning plate passes through the groove of the detection probe 2-11. When the photoelectric signal emitted by the detection probe 2-11 is blocked by the positioning plate, a detection signal is generated, thereby calibrating the initial position of the drive shaft and its rotating wheel 2-9.
[0034] Test operation process:
[0035] According to the characteristics of the test object, a plurality of test pieces are prepared in advance; initially, the lifting drive component 2 lowers the lifting platform and the lower test component 5 to a low position, at which time the upper test terminal 4-3 and the lower test terminal 5-3 are separated from each other and have sufficient operating distance; the tester places the test piece on the lower test terminal 5-3, and then sends a command to the lifting drive component 2 through the controller, and the driving motor 2-12 drives the driving shaft to rotate 180°, and the rotating wheel 2-9 rotates 180° accordingly. As the rotating wheel 2-9 rotates, the lower end block, the support rod 2-3 and the lifting block 2-4 are driven upward, and stop when the protrusion on the side of the lower end block moves to the high point position of the slide 2-10. At this time, the lifting platform and the lower test component 5 are It is raised to a high position, and the test piece is stably and effectively clamped between the upper test terminal 4-3 and the lower test terminal 5-3. Then the vector network analyzer 7 is operated to complete the magnetic shielding effectiveness test of the current test piece by executing the signal receiving and sending process. After the test is completed, the controller sends an instruction to the lifting drive assembly 2, and the driving motor 2-12 drives the driving shaft to rotate 180° again, and the rotating wheel 2-9 rotates 180° accordingly. As the rotating wheel 2-9 rotates, the lower end block, the support rod 2-3 and the lifting block 2-4 are driven downward and move. When the protrusion on the side of the lower end block moves to the low point position of the slide 2-10, it stops. At this time, the lifting platform and the lower test assembly 5 are reset to the initial position, and the test piece can be removed and another test piece can be placed.
Claims
1. A magnetic shielding effectiveness testing device, characterized by: The invention comprises a cabinet (1), a guide bracket (3) is installed on the top of the cabinet (1), a fixed upper test assembly (4) is installed on the top of the guide bracket (3), a lifting lower test assembly (5) is installed at the bottom of the guide bracket (3), a lifting drive assembly (2) for driving the lower test assembly (5) to move up and down is also installed in the cabinet (1), a vector network analyzer (7) is also installed on the cabinet (1), and the upper test assembly (4) and the lower test assembly (5) are respectively connected to the vector network analyzer (7) through a lead cable (6); the lifting drive assembly (2) comprises a back support plate (2-1) and a front support plate (2-1). A support plate (2-2) is provided. A rotating wheel (2-9) driven to rotate by a driving mechanism and having a slideway (2-10) on its side wall is installed on the front support plate (2-2). A base (2-6) with a guide hole is also installed on the front support plate (2-2). A support rod (2-3) is provided in the guide hole. A lower end block with a convex block on the side is installed at the lower end of the support rod (2-3), and the convex block is located in the slideway (2-10). A lifting block (2-4) is fixed in the middle of the support rod (2-3). A connecting seat (2-7) is installed on the side of the lifting block (2-4). A lifting support plate (2-8) is installed on the connecting seat (2-7).
2. The magnetic shielding effectiveness testing device according to claim 1, wherein: A buffer mechanism (2-5) is also installed between the connecting seat (2-7) and the lifting block (2-4). The buffer mechanism (2-5) includes a horizontal guide hole provided on the lifting block (2-4), a guide rod installed in the guide hole, the connecting seat (2-7) is fixedly connected to the rear end of the guide rod, an end plate is installed at the front end of the guide rod, and a buffer spring is provided between the end plate and the lifting block (2-4).
3. The magnetic shielding effectiveness testing device according to claim 2, wherein: The driving mechanism comprises a driving motor (2-12) fixedly mounted on the side of the front support plate (2-2), and a driving shaft mounted on the side of the front support plate (2-2); a rotating wheel (2-9) is fixedly mounted on the lower end of the driving shaft; a driving pulley (2-14) is mounted on the output shaft of the driving motor (2-12); a driven pulley (2-15) is mounted on the upper end of the driving shaft; the driving pulley (2-14) and the driven pulley (2-15) are connected by a belt (2-13) for transmission.
4. The magnetic shielding effectiveness testing device according to claim 3, wherein: A detection probe (2-11) is also installed in the middle of the side of the front support plate (2-2), and a positioning plate matched with the detection probe (2-11) is installed in the middle of the driving shaft.
5. The magnetic shielding effectiveness testing device according to claim 4, wherein: The guide bracket (3) comprises a plurality of vertical guide columns (3-2), a top plate (3-1) being mounted on the upper end of each guide column (3-2) and a bottom plate (3-6) being mounted on the lower end, a guide sleeve (3-4) being mounted in the middle of each guide column (3-2), a lifting upper plate (3-3) being mounted on the upper end of each guide sleeve (3-4) and a lifting lower plate (3-5) being mounted on the lower end, an upper test assembly (4) being mounted and fixed in the middle of the top plate (3-1), a lower test assembly (5) being mounted and fixed in the middle of the lifting upper plate (3-3), the bottom plate (3-6) being fixedly connected to the cabinet (1), and a lifting support plate (2-8) of the lifting drive assembly (2) extending upward from a window arranged in the middle of the bottom plate (3-6) and being fixedly connected to the lifting lower plate (3-5).
6. The magnetic shielding effectiveness testing device according to claim 5, wherein: The upper test assembly (4) comprises an upper test seat (4-2) fixed to a top plate (3-1), an upper test terminal (4-3) being mounted on the bottom of the upper test seat (4-2), and an upper N-type connector (4-1) connected to the upper test terminal (4-3) being mounted on the top; and the lower test assembly (5) comprises a lower test seat (5-2) fixed to an upper lifting plate (3-3), a lower test terminal (5-3) being mounted on the top of the lower test seat (5-2), and a lower N-type connector (5-1) connected to the lower test terminal (5-3) being mounted on the bottom.