RF performance testing device for RF connector after assembly

Abstract

The present invention discloses a device for detecting the radio frequency performance of a radio frequency connector after assembly, and relates to the field of microwave testing technology; specifically, it comprises a microwave module, one side of the microwave module is clamped with a conducting assembly, and one side of the conducting assembly is clamped with a transverse metal cavity, one side of the transverse metal cavity is connected with a radio frequency adapter through a thread, the top of the transverse metal cavity is plugged with a plug-in assembly, and shielding sheets are welded to the ends of both sides of the transverse metal cavity, the inner bottom of the microwave module is fixedly connected with a microwave circuit board, and the top of the microwave circuit board is provided with a radio frequency connector, the end of the radio frequency connector is in contact with the end of the conducting assembly, the end of the radio frequency connector is fixedly connected with a conducting element, and mounting seats are welded to both sides of the end of the radio frequency connector. The present invention effectively solves the problem that the radio frequency performance detection of the assembled radio frequency connector is inconvenient due to the traditional radio frequency connector being installed in the microwave module, and improves the quality of radio frequency connector detection.

Description

Technical Field

[0001] The invention relates to the technical field of microwave testing, and in particular to a device for detecting radio frequency performance of a radio frequency connector after assembly. Background Art

[0002] In modern communications and electronic equipment, RF connectors are an important component of signal transmission and are widely used in wireless communications, radar, satellite communications, radio frequency identification (RFID) and other high-frequency devices. The main function of RF connectors is to connect and disconnect circuits to ensure the effective transmission of RF signals. However, with the continuous advancement of technology and the increasing complexity of applications, the performance requirements of RF connectors are also increasing, especially in terms of frequency, bandwidth, insertion loss, reflection loss and durability. The performance test of RF connectors after assembly is a key link to ensure the normal operation of the equipment and signal integrity. First of all, the performance of the connector directly affects the signal quality and transmission efficiency of the entire system. If the insertion loss and reflection loss of the connector are too high, it will cause signal attenuation and reflection, thereby reducing the overall performance of the system. Therefore, after the connector is assembled, RF performance testing can be carried out to detect potential problems in time and ensure that the connector can work effectively within the predetermined frequency range.

[0003] However, during the assembly process of microwave components, uneven solder distribution, holes on the soldering surface, solder remelting short circuits, and skewness of the central axis of the insulator may occur around the connector. These factors will cause the microwave transmission performance of the connector to deteriorate, so effective measurement methods must be used to detect the assembled RF connector. At the same time, after the RF connector is installed in the component, the outer conductor of the connector is welded to the cavity of the component, and the connector sinks into the deep cavity, making it difficult to detect the RF performance of the assembled RF connector. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a device for detecting the radio frequency performance of a radio frequency connector after assembly.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The invention discloses a device for detecting radio frequency performance of a radio frequency connector after assembly, comprising a microwave module, a conducting assembly being clamped on one side of the microwave module, a transverse metal cavity being clamped on one side of the conducting assembly, a radio frequency adapter being threadedly connected to one side of the transverse metal cavity, a plug-in assembly being plugged into the top of the transverse metal cavity, shielding sheets being welded to both side ends of the transverse metal cavity, a microwave circuit board being fixedly connected to the inner bottom of the microwave module, a radio frequency connector being arranged on the top of the microwave circuit board, and an end of the radio frequency connector being in contact and connected with an end of the conducting assembly.

[0007] Preferably: the end of the RF connector is fixedly connected with a conducting element, and mounting seats are welded on both sides of the end of the RF connector, a stabilizing seat is clamped on the opposite end of the mounting seat, the conducting element passes through the stabilizing seat, and a buffer component is arranged inside the end of the RF connector close to the conducting element.

[0008] Furthermore: the buffer assembly includes a shielding cover, a contact metal head, a second spring and a fixed disc, and the shielding cover is welded to the inner side of the end of the RF connector, the fixed disc is welded to the end of the conductive element, and the end of the second spring is welded to one side of the fixed disc.

[0009] Based on the above scheme: the contact metal head is welded to the other end of spring 2, and an inner conical groove is opened on the inner side of the shielding cover, shielding wires are welded at equal distances on the inner surface of the inner conical groove, and an inner groove is opened at the end of the contact metal head.

[0010] A more preferred solution in the above solution is that the guide assembly includes a slope, a guide hole, a slide groove, a fixed ring, a swivel, a rotating seat, a metal guide sheet, a guide hole, a metal strip, a slope, a moving block, a spring and a metal connecting rod, and the metal shell is plugged into one side of the microwave module, the guide hole is provided on the inner side of the bottom of the metal shell, and the slide groove is provided on the inner walls of both sides of the metal shell;

[0011] The rotating ring is driven to rotate by rotating the rotating seat, and the rotating ring contacts the top of the moving block. Initially, the protrusions on both sides of the ring contact the bottom of the circumferential slope of the top of the moving block. When the ring rotates, the protrusions on both sides of the ring slide upward on the circumferential slope of the top of the moving block until they abut against the two ends of the top of the moving block, driving the moving block to slide downward in the slide groove;

[0012] At the same time, the metal connecting rod slides downward synchronously, spring one is squeezed, and the bottom end of the metal connecting rod penetrates into the shielding cover, so that the end of the metal connecting rod contacts the inner groove of the contact metal head, and spring two is squeezed, thereby realizing the connection between the conductive element and the end of the RF connector. Otherwise, the RF connector is disconnected and detected.

[0013] As a further solution of the present invention: the fixed ring is fixedly connected to the top of the metal shell, and a prompt line is provided on the circumferential surface of the fixed ring, the bottom end of spring one is welded to the inner wall of the metal shell near the top of the guide hole, the two sides of the moving block are slidably connected in the slide groove through guide bars, the metal connecting rod is inserted into the inner side of spring one, and the top end of the metal connecting rod is fixedly connected to the bottom of the moving block.

[0014] At the same time, the metal strip is welded to the top of the metal connecting rod, slopes are opened on both sides of the top circumference of the moving block, and the two slopes are centrally symmetrical, the swivel is arranged inside the fixed ring, and the guide hole is opened at the top of the swivel, and the bottom end of the rotating seat is fixedly connected to the guide hole through a metal shaft.

[0015] As a preferred embodiment of the present invention: the metal guide is fixedly connected to the top of the rotating seat, the metal shaft is electrically connected to the metal guide, protrusions are respectively provided on both sides of the rotating ring, and the top of the metal strip is connected to the bottom of the metal shaft.

[0016] At the same time, the plug-in assembly includes a plug-in board, a ball contact block, a strip line, a direct-isolating element and a slot, and the slot is opened at the top of the horizontal metal cavity, the plug-in board is plugged into the slot, the ball contact blocks are welded to both sides of the plug-in board in pairs, and the two ends of the strip line are respectively welded to the ball contact blocks, and the direct-isolating element is arranged on the inner side of the strip line.

[0017] As a better solution of the present invention: annular copper sheets are fixedly connected to the two inner sides of the horizontal metal cavity, and contact terminals are welded on the opposite sides of the annular copper sheets, a gasket is bonded to the bottom of the slot, and a metal ball groove is welded on one side of the slot close to each contact terminal, and embedded metal wires are embedded in the metal ball grooves and the contact terminals.

[0018] The beneficial effects of the present invention are:

[0019] 1. The device for detecting the radio frequency performance of the assembled radio frequency connector drives the rotating ring to rotate by rotating the rotating seat, and the rotating rotating ring contacts the top of the moving block. Initially, the protrusions on both sides of the rotating ring contact the bottom of the circular slope on the top of the moving block. When the rotating ring rotates, the protrusions on both sides of the rotating ring slide upward on the circular slope on the top of the moving block until they abut against the two ends of the top of the moving block, driving the moving block to slide downward in the slide groove, and at the same time, the metal connecting rod slides downward synchronously, the spring 1 is squeezed, and the bottom end of the metal connecting rod penetrates into the shielding cover, so that the end of the metal connecting rod contacts the inner groove of the contact metal head, and the spring 2 is squeezed, thereby realizing the connection between the conductive element and the end of the radio frequency connector. Conversely, the radio frequency connector is disconnected and detected, which effectively solves the problem that the traditional radio frequency connector is installed in the microwave module, resulting in inconvenient radio frequency performance detection of the assembled radio frequency connector, and improves the quality of radio frequency connector detection.

[0020] 2. The assembled RF connector RF performance detection device can effectively isolate the electromagnetic interference between the internal circuit and the external environment by means of the shielding wire arranged in the shielding cover, effectively reduce the crosstalk and reflection loss, and at the same time reduce the influence of the electromagnetic radiation of the surrounding environment. In addition, by setting the inner groove, the second spring and the fixed disc, the inertial force of the connection between the metal connecting rod and the contact metal head can be effectively reduced, thereby protecting the end of the RF connector and improving the stability of the detection.

[0021] 3. The RF performance detection device for the assembled RF connector welds connecting terminals on the top of the metal guide, and plugs the connecting terminals at the end of the metal guide and the connecting terminals at the end of the RF adapter into the center of the annular copper sheet respectively. Subsequently, the plug-in board is plugged into the card slot so that the ball-shaped contact blocks on both sides of the plug-in board are respectively in contact with the metal ball slots to form a switching circuit. This not only ensures the smooth operation of the switching circuit, but also isolates the DC signal in the switching circuit to ensure the safety of the switching circuit. At the same time, this structure completes the switching circuit by plugging, which facilitates subsequent circuit detection and maintenance and improves detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the main structure of the device for detecting the radio frequency performance of the assembled radio frequency connector proposed by the present invention;

[0023] Figure 2 It is a schematic diagram of the top view of the structure of the device for detecting the radio frequency performance of the assembled radio frequency connector proposed by the present invention;

[0024] Figure 3 It is a schematic diagram of the enlarged structure of A in the device for detecting the radio frequency performance of the assembled radio frequency connector proposed by the present invention;

[0025] Figure 4 It is a schematic diagram of the cross-sectional structure of the transverse metal cavity in the radio frequency performance detection device for the assembled radio frequency connector proposed by the present invention;

[0026] Figure 5 It is a structural schematic diagram of the plug-in assembly in the radio frequency performance detection device for the assembled radio frequency connector proposed by the present invention;

[0027] Figure 6 It is a schematic diagram of the exploded structure of the conductive connection component in the radio frequency performance detection device for the assembled radio frequency connector proposed by the present invention;

[0028] Figure 7 It is a structural schematic diagram of a buffer component in the radio frequency performance detection device for a radio frequency connector after assembly proposed by the present invention;

[0029] Figure 8 The present invention is a schematic structural diagram of a shielding cover in the device for detecting radio frequency performance of a radio frequency connector after assembly.

[0030] In the figure: 1, microwave module; 2, guide assembly; 3, horizontal metal cavity; 4, RF adapter; 5, shielding sheet; 6, plug assembly; 7, prompt line; 8, RF connector; 9, microwave circuit board; 10, mounting seat; 11, guide element; 12, stable seat; 201, metal shell; 202, guide hole; 203, slide groove; 204, fixing ring; 205, rotating ring; 206, rotating seat; 207, metal guide; 208, guide hole; 209, metal strip; 210, slope; 211 , moving block; 212, spring one; 213, metal connecting rod; 301, annular copper sheet; 302, contact terminal; 303, metal ball groove; 304, gasket; 305, embedded metal wire; 306, plug-in board; 307, ball contact block; 308, strip line; 309, direct isolation element; 310, slot; 801, shielding cover; 802, contact metal head; 803, spring two; 804, fixed disc; 8011, inner conical groove; 8012, shielding wire; 8021, inner groove. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] After assembly, the RF performance testing device of the RF connector is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, it includes a microwave module 1, one side of the microwave module 1 is clamped with a conducting component 2, and one side of the conducting component 2 is clamped with a transverse metal cavity 3, one side of the transverse metal cavity 3 is connected with a radio frequency adapter 4 through a thread, the top of the transverse metal cavity 3 is plugged with a plug-in component 6, and shielding sheets 5 are welded to the ends of both sides of the transverse metal cavity 3, the inner bottom of the microwave module 1 is fixedly connected with a microwave circuit board 9, and the top of the microwave circuit board 9 is provided with a radio frequency connector 8, and the end of the radio frequency connector 8 is in contact with the end of the conducting component 2; the model of the radio frequency connector 8 is SMA-KHD16, and the model of the radio frequency adapter 4 is MA-Maleto N-Female Adapter.

[0036] In order to effectively detect the RF performance of the assembled RF connector 8; Figure 6 , Figure 7 and Figure 8 As shown, the end of the RF connector 8 is fixedly connected with a conducting element 11, and mounting seats 10 are welded on both sides of the end of the RF connector 8, and a stabilizing seat 12 is clamped at the opposite end of the mounting seat 10, and the conducting element 11 passes through the stabilizing seat 12, and a buffer component is arranged inside the end of the RF connector 8 close to the conducting element 11;

[0037] The buffer assembly includes a shielding cover 801, a contact metal head 802, a second spring 803 and a fixed disc 804, and the shielding cover 801 is welded to the inner side of the end of the RF connector 8, the fixed disc 804 is welded to the end of the conductive element 11, and the end of the second spring 803 is welded to one side of the fixed disc 804;

[0038] The contact metal head 802 is welded to the other end of the second spring 803, and an inner conical groove 8011 is provided on the inner side of the shielding cover 801, and shielding wires 8012 are welded to the inner surface of the inner conical groove 8011 at equal distances, and an inner groove 8021 is provided at the end of the contact metal head 802;

[0039] The guide assembly 2 includes a slope 210, a guide hole 202, a slide groove 203, a fixed ring 204, a rotating ring 205, a rotating seat 206, a metal guide sheet 207, a guide hole 208, a metal strip 209, a slope 210, a moving block 211, a spring 212 and a metal connecting rod 213, and the metal shell 201 is plugged into one side of the microwave module 1, the guide hole 202 is provided on the inner side of the bottom of the metal shell 201, and the slide groove 203 is provided on the inner walls of both sides of the metal shell 201;

[0040] The fixing ring 204 is fixedly connected to the top of the metal shell 201, and a prompt line 7 is provided on the circumferential surface of the fixing ring 204. The bottom end of the spring 1 212 is welded to the inner wall of the metal shell 201 above the guide hole 202. Both sides of the moving block 211 are slidably connected to the slide groove 203 through the guide bar. The metal connecting rod 213 is inserted into the inner side of the spring 1 212, and the top end of the metal connecting rod 213 is fixedly connected to the bottom of the moving block 211.

[0041] The metal strip 209 is welded to the top of the metal connecting rod 213, the slopes 210 are provided on both sides of the top circumference of the moving block 211, and the two slopes 210 are centrally symmetrical, the rotating ring 205 is arranged inside the fixed ring 204, and the guide hole 208 is provided at the top of the rotating ring 205, and the bottom end of the rotating seat 206 is fixedly connected to the guide hole 208 through a metal shaft;

[0042] The metal guide piece 207 is fixedly connected to the top of the rotating seat 206, the metal shaft is electrically connected to the metal guide piece 207, protrusions are respectively provided on both sides of the rotating ring 205, and the top of the metal strip 209 is connected to the bottom of the metal shaft;

[0043] During operation, the rotating ring 205 is driven to rotate by rotating the rotating seat 206, and the rotating ring 205 contacts the top of the moving block 211. Initially, the protrusions on both sides of the rotating ring 205 contact the bottom of the circumferential slope 210 on the top of the moving block 211. When the rotating ring 205 rotates, the protrusions on both sides of the rotating ring 205 slide upward on the circumferential slope 210 on the top of the moving block 211 until they abut against the two ends of the top of the moving block 211, driving the moving block 211 to slide downward in the slide groove 203, and the metal connecting rod 213 slides down synchronously. The spring 1 212 is moved, and the bottom end of the metal connecting rod 213 is deeply inserted into the shielding cover 801, so that the end of the metal connecting rod 213 contacts the inner groove 8021 of the contact metal head 802, and the spring 2 803 is squeezed, so that the connection between the conductive element 11 and the end of the RF connector 8 is realized. On the contrary, the RF connector 8 is disconnected and detected, which effectively solves the problem that the traditional RF connector 8 is installed in the microwave module 1, resulting in inconvenient RF performance detection of the assembled RF connector 8, and improves the quality of the RF connector 8 detection;

[0044] At the same time, the shielding wire 8012 arranged in the shielding cover 801 can effectively isolate the electromagnetic interference between the internal circuit and the external environment, effectively reduce crosstalk and reflection loss, and at the same time reduce the impact of electromagnetic radiation from the surrounding environment. By setting the inner groove 8021, the second spring 803 and the fixed disc 804, the inertial force connecting the metal connecting rod 213 and the contact metal head 802 can be effectively reduced, thereby protecting the end of the RF connector 8 and improving the stability of detection.

[0045] In order to achieve smooth switching circuit, the DC signal in the switching circuit is isolated; Figure 4 , Figure 5 As shown, the plug assembly 6 includes a plug board 306, a ball contact block 307, a strip line 308, a direct isolation element 309 and a slot 310, and the slot 310 is opened at the top of the horizontal metal cavity 3, the plug board 306 is plugged into the slot 310, the ball contact blocks 307 are welded to both sides of the plug board 306, and the two ends of the strip line 308 are respectively welded to the ball contact blocks 307, and the direct isolation element 309 is arranged on the inner side of the strip line 308;

[0046] The two inner sides of the transverse metal cavity 3 are respectively fixedly connected with annular copper sheets 301, and the opposite sides of the annular copper sheets 301 are respectively welded with contact terminals 302, a gasket 304 is bonded to the bottom of the card slot 310, and a metal ball slot 303 is welded on one side of the card slot 310 close to each contact terminal 302, and an embedded metal wire 305 is embedded in the metal ball slot 303 and the contact terminal 302;

[0047] When in use, a connecting terminal is welded on the top of the metal guide 207, and the connecting terminal at the end of the metal guide 207 and the connecting terminal at the end of the RF adapter 4 are respectively plugged into the center of the annular copper sheet 301. Subsequently, the plug-in board 306 is plugged into the card slot 310, so that the ball-shaped contact blocks 307 on both sides of the plug-in board 306 are respectively in contact with the metal ball slots 303 to form a switching circuit. In this way, not only the smoothness of the switching circuit is achieved, but also the DC signal in the switching circuit can be isolated to ensure the safety of the switching circuit. At the same time, this structure completes the switching circuit by plugging, which is convenient for subsequent circuit detection and maintenance and improves the detection efficiency.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for detecting radio frequency performance of a radio frequency connector after assembly, comprising a microwave module (1), characterized in that: A conducting assembly (2) is clamped on one side of the microwave module (1), and a transverse metal cavity (3) is clamped on one side of the conducting assembly (2); a radio frequency adapter (4) is connected to one side of the transverse metal cavity (3) via a thread; a plug-in assembly (6) is plugged into the top of the transverse metal cavity (3), and shielding sheets (5) are welded to the ends of both sides of the transverse metal cavity (3); a microwave circuit board (9) is fixedly connected to the inner bottom of the microwave module (1), and a radio frequency connector (8) is arranged on the top of the microwave circuit board (9); and an end of the radio frequency connector (8) is in contact with and connected to an end of the conducting assembly (2); The guide assembly (2) comprises a slope (210), a guide hole (202), a slide groove (203), a fixed ring (204), a rotating ring (205), a rotating seat (206), a metal guide sheet (207), a guide hole (208), a metal strip (209), a slope (210), a moving block (211), a spring 1 (212) and a metal connecting rod (213), and the metal shell (201) is plugged into one side of the microwave module (1), the guide hole (202) is provided on the inner side of the bottom of the metal shell (201), and the slide groove (203) is provided on the inner walls of both sides of the metal shell (201); The fixing ring (204) is fixedly connected to the top of the metal shell (201), and a prompt line (7) is provided on the circumferential surface of the fixing ring (204). The bottom end of the spring (212) is welded to the inner wall of the metal shell (201) above the guide hole (202). Both sides of the moving block (211) are slidably connected to the slide groove (203) through guide bars. The metal connecting rod (213) is inserted into the inner side of the spring (212), and the top end of the metal connecting rod (213) is fixedly connected to the bottom of the moving block (211). The metal strip (209) is welded to the top of the metal connecting rod (213), the slopes (210) are provided on both sides of the top circumference of the moving block (211), and the two slopes (210) are centrally symmetrical, the rotating ring (205) is arranged inside the fixed ring (204), and the guide hole (208) is provided at the top of the rotating ring (205), and the bottom end of the rotating seat (206) is fixedly connected to the guide hole (208) via a metal shaft; The metal guide piece (207) is fixedly connected to the top end of the rotating seat (206), the metal shaft is electrically connected to the metal guide piece (207), protrusions are respectively provided on both sides of the rotating ring (205), and the top end of the metal strip (209) is connected to the bottom end of the metal shaft.

2. The device for detecting radio frequency performance of a radio frequency connector after assembly according to claim 1, characterized in that: The end of the radio frequency connector (8) is fixedly connected to a conducting element (11), and mounting seats (10) are welded to both sides of the end of the radio frequency connector (8), a stabilizing seat (12) is clamped on the opposite end of the mounting seat (10), the conducting element (11) passes through the stabilizing seat (12), and a buffer component is provided inside the end of the radio frequency connector (8) close to the conducting element (11).

3. The device for detecting radio frequency performance of a radio frequency connector after assembly according to claim 2, characterized in that: The buffer assembly comprises a shielding cover (801), a contact metal head (802), a second spring (803) and a fixed disc (804), wherein the shielding cover (801) is welded to the inner side of the end of the radio frequency connector (8), the fixed disc (804) is welded to the end of the conductive element (11), and the end of the second spring (803) is welded to one side of the fixed disc (804).

4. The device for detecting radio frequency performance of a radio frequency connector after assembly according to claim 3, characterized in that: The contact metal head (802) is welded to the other end of the second spring (803), and an inner conical groove (8011) is provided on the inner side of the shielding cover (801), shielding wires (8012) are welded to the inner surface of the inner conical groove (8011) at equal distances, and an inner groove (8021) is provided at the end of the contact metal head (802).

5. The device for detecting radio frequency performance of a radio frequency connector after assembly according to claim 1, characterized in that: The plug-in assembly (6) comprises a plug-in board (306), a spherical contact block (307), a strip line (308), a direct current isolation element (309) and a slot (310), wherein the slot (310) is provided at the top of the transverse metal cavity (3), the plug-in board (306) is plugged into the slot (310), the spherical contact blocks (307) are welded to two sides of the plug-in board (306), two ends of the strip line (308) are respectively welded to each other at the spherical contact blocks (307), and the direct current isolation element (309) is arranged on the inner side of the strip line (308).

6. The device for detecting radio frequency performance of a radio frequency connector after assembly according to claim 1, characterized in that: An annular copper sheet (301) is fixedly connected to the two inner sides of the transverse metal cavity (3), and contact terminals (302) are welded to the opposite sides of the annular copper sheet (301), a gasket (304) is bonded to the bottom of the card slot (310), and a metal ball slot (303) is welded to one side of the card slot (310) close to each contact terminal (302), and an embedded metal wire (305) is embedded in the metal ball slot (303) and the contact terminal (302).

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