Radio frequency probe

Abstract

The invention discloses a radio frequency probe, which comprises a probe main body and a connecting flange, and is characterized in that the probe main body comprises a shell, an insulating structure and a probe structure; a first convex part and a second convex part are formed on the shell, so that a first concave part is formed between the first convex part and the second convex part; the first end of the connecting flange is propped against the first convex part, and the second end of the connecting flange is elastically propped against the second convex part through an elastic structure; a guide part is arranged at the joint of the first convex part and the first concave part, a guide groove matched with the guide part in shape is formed in one end of the guide through hole, and the guide part extends into the guide groove. According to the invention, the guide part is arranged at the joint of the first concave parts of the shell, and the guide groove is correspondingly formed in the connecting flange; the deflection angle of the probe main body can be greatly increased, so that the fault-tolerant capability of the radio frequency probe during testing is improved.

Description

Technical Field

[0001] The invention belongs to the field of component testing, and in particular relates to a radio frequency probe. Background Art

[0002] RF probes are generally used to connect to test sockets on modules such as PCB circuit boards to test the electronic components thereon. In order to enable automatic control of the RF probe by the equipment for automated testing, the RF probe must have a certain deflection capability to accommodate errors in the installation of the test socket and errors in the positioning of the testing fixture. Existing RF probes generally achieve fault tolerance during automatic testing by allowing the probe to deflect slightly through a connection gap reserved between the housing and the flange. To avoid misalignment of the probe after testing, the connection gap must be very small, which results in a very small fault tolerance angle for the RF probe, generally not exceeding 5°. This requires higher precision in the installation of the test socket and in the positioning of the test workpiece to meet the requirements of automatic testing. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a radio frequency probe.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A radio frequency probe comprises a probe body and a connecting flange sleeved on the probe body, the probe body comprising a shell, an insulating structure arranged in the shell and a probe structure penetrated in the insulating structure; a guide through-hole is provided in the middle of the connecting flange, the shell is penetrated in the guide through-hole, and a first gap is left between the hole wall of the guide through-hole and the shell; a first convex portion and a second convex portion are formed on the shell, thereby forming a first concave portion between the first convex portion and the second convex portion; the first end of the connecting flange abuts against the first convex portion, and the second end of the connecting flange elastically abuts against the second convex portion through an elastic structure; an outwardly protruding guide portion is provided at the connection between the first convex portion and the first concave portion, and a guide groove adapted to the shape of the guide portion is provided at one end of the guide through-hole, and the guide portion extends into the guide groove.

[0006] Furthermore, a second gap is left between the surface of the guide portion and the groove wall of the guide groove, and the second gap is connected to the first gap.

[0007] Furthermore, the width of the second gap gradually decreases from one end connected to the first gap to the other end, and the minimum width of the second gap is smaller than the width of the first gap.

[0008] Furthermore, the guide portion is an arc-shaped portion, and the guide groove is an arc-shaped groove; the first convex portion and the arc-shaped portion are both annular structures.

[0009] Furthermore, the elastic structure is a spring, and a circular sleeve is also provided on the first recessed portion, and an abutment disk is provided at one end of the circular sleeve. The first end of the spring is provided on the circular sleeve and elastically abuts against the abutment disk, thereby pushing the abutment disk to abut against the connecting flange; the second end of the spring elastically abuts against the second protrusion.

[0010] Furthermore, a first connecting cavity is provided at the first end of the shell, and a second connecting cavity is provided at the second end of the shell, and the second connecting cavity is in the shape of a trumpet that is wide on the outside and narrow on the inside; the probe structure includes a first probe and a second probe connected to the first probe, and the insulating structure includes a first insulator arranged adjacent to the first connecting cavity, a second insulator arranged at the connection between the first probe and the second probe, and a third insulator arranged adjacent to the second connecting cavity; the first end of the first probe passes through the first insulator and extends into the first connecting cavity; the second end of the first probe passes through the second insulator and is connected to the first end of the second probe; the second end of the second probe passes through the second insulator and extends into the second connecting cavity.

[0011] Furthermore, the first probe includes a first body portion, a first end of the first body portion is inserted into the first insulator and is provided with a connecting needle, and the connecting needle extends into the first connecting cavity; a third protrusion is provided at a position near the first end of the first body portion, and a first groove adapted to the third protrusion is provided at the second end of the first insulator, and the third protrusion extends into the first groove and abuts against the bottom of the first groove for limiting position; a probe connecting groove is provided at the second end of the first body portion;

[0012] The second probe includes a second body portion, a probe connecting portion is provided at the first end of the second body portion, and the probe connecting portion is connected to the probe connecting groove; a detection portion is provided at the second end of the second body portion, and the detection portion passes through the third insulator and extends into the second connecting cavity; the diameter of the second body portion is consistent with the diameter of the probe connecting portion and the detection portion, so that the first end of the second body portion abuts against the second insulator for a limited position, and the second end abuts against the third insulator for a limited position.

[0013] Furthermore, the shell includes a first contact portion, a first connecting portion, a second connecting portion and a second contact portion, the first protrusion is arranged on the first connecting portion; the first end of the first connecting portion is connected to the second end of the first contact portion, and the first connecting cavity is arranged at the first end of the first contact portion; the second end of the first connecting portion is connected to the first end of the second connecting portion, and the second protrusion is arranged on the second connecting portion; the second end of the second connecting portion is connected to the first end of the second contact portion, and the second connecting cavity is arranged at the second end of the second contact portion.

[0014] Furthermore, the first end of the first connecting portion is provided with a first connecting groove, and the second end of the first contact portion is connected to the first connecting groove; the first end of the second connecting portion is provided with a second connecting groove, and the second end of the first connecting portion is connected to the second connecting groove; the first end of the second contact portion is provided with a third connecting groove, and the second end of the second connecting portion is connected to the third connecting groove.

[0015] Furthermore, the second end of the first contact portion is provided with a first card slot communicating with the first connecting cavity, the first insulator is arranged in the first card slot, and the size of the first card slot and the size of the first insulator are both larger than the size of the first connecting cavity; the second end of the second connecting portion is provided with a second card slot, and the second insulator is arranged in the second card slot; the second contact portion is provided with a third card slot communicating with the third connecting slot, and the size of the second card slot and the size of the second insulator are both larger than the size of the third card slot; the third card slot is connected to the second connecting cavity through a connecting through hole, and the third insulator is arranged at one end of the third card slot adjacent to the connecting through hole.

[0016] In the present invention, by providing an arcuate portion at the junction of the first and second recesses of the housing, and by providing a corresponding arcuate groove on the connecting flange, the deflection angle of the probe body can be significantly increased, thereby enhancing the fault tolerance of the RF probe during testing. Furthermore, by gradually reducing the width of the second gap so that its minimum width is smaller than that of the first gap, displacement of the probe body after reset can be reduced or avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 Schematic diagram of the structure of a radio frequency probe according to an embodiment of the present invention.

[0019] Figure 2 for Figure 1 The explosive picture.

[0020] Figure 3 for Figure 1 Top view of .

[0021] Figure 4 for Figure 3 AA section view.

[0022] Figure 5 A cross-sectional view of the shell.

[0023] Figure 6 It is a cross-sectional view of the insulation structure and the probe structure.

[0024] Figure 7 It is a cross-sectional view of this embodiment in the test state.

[0025] Figure 8 This is a cross-sectional view of the connecting flange in a deflected state when the conventional structure is adopted.

[0026] Figure 9 It is a cross-sectional view of this embodiment in a deflected state.

[0027] Figure 10 This is a cross-sectional view showing the displacement of the probe body after reset when the connecting flange adopts a conventional structure.

[0028] The accompanying drawings in this specification are numeraled as follows:

[0029] Housing 100; first convex portion 101; second convex portion 102; first concave portion 103; first contact portion 110; first connecting cavity 111; first latching groove 112; first connecting portion 120; first connecting groove 121; arc-shaped portion 122; second concave portion 123; second connecting portion 130; second connecting groove 131; second latching groove 132; second contact portion 140; second connecting cavity 141; third connecting groove 142; third latching groove 143; connecting through hole 144; annular sleeve 150; abutting plate 151; spring 160; first gap 171; second gap 172;

[0030] Insulation structure 200; first insulator 210; first groove 211; second insulator 220; third insulator 230;

[0031] Probe structure 300; first probe 310; first body 311; connecting needle 312; third protrusion 313; probe connecting groove 314; second probe 320; second body 321; probe connecting portion 322; detecting portion 323;

[0032] Connecting flange-400; guide hole-401; arc groove-402; mounting hole-403;

[0033] Test socket-500; metal socket core-510. DETAILED DESCRIPTION

[0034] The following describes the implementation of the present invention through specific examples. The illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention. The following embodiments and features in the embodiments may be combined with each other unless there is any conflict.

[0035] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 A preferred embodiment of the radio frequency probe of the present invention includes a probe body and a connecting flange 400 sleeved on the probe body. The probe body includes a shell 100, an insulating structure 200 disposed in the shell 100, and a probe structure 300 inserted into the insulating structure 200. A guide hole 401 is provided in the middle of the connecting flange 400. The shell 100 is inserted into the guide hole 401, and a first gap 171 is left between the hole wall of the guide hole 401 and the shell 100. Of course, the connecting flange 400 is generally further provided with a mounting hole 403 on both sides of the guide hole 401, so as to facilitate the installation of the radio frequency probe on a detection fixture (not shown in the figure) for automatic detection.

[0036] The housing 100 is formed with a first convex portion 101 and a second convex portion 102, thereby forming a first concave portion 103 between the first convex portion 101 and the second convex portion 102. Figure 5 To facilitate assembly of the housing 100, the housing 100 may include a first contact portion 110, a first connecting portion 120, a second connecting portion 130, and a second contact portion 140. The first protrusion 101 is provided on the first connecting portion 120, and a first end of the first connecting portion 120 is connected to a second end of the first contact portion 110. The second end of the first connecting portion 120 is connected to a first end of the second connecting portion 130. The second protrusion 102 is provided on the second connecting portion 130, and a second end of the second connecting portion 130 is connected to a first end of the second contact portion 140.

[0037] In this embodiment, the first end of the first connecting portion 120 is provided with a first connecting groove 121, and the second end of the first contact portion 110 is interference-fitted into the first connecting groove 121. The first end of the second connecting portion 130 is provided with a second connecting groove 131, and the second end of the first connecting portion 120 is interference-fitted into the second connecting groove 131. To facilitate positioning during connection, a second recess 123 is generally formed on the outer side of the first connecting portion 120, so that the second recess 123 is interference-fitted into the second connecting groove 131. The first end of the second contact portion 140 is provided with a third connecting groove 142, and the second end of the second connecting portion 130 is interference-fitted into the third connecting groove 142.

[0038] The first end of the connecting flange 400 abuts the first protrusion 101, and the second end of the connecting flange 400 elastically abuts the second protrusion 102 via an elastic structure. In this embodiment, the elastic structure is preferably a spring 160. The first recess 103 is also provided with a circular sleeve 150, and one end of the circular sleeve 150 is provided with an abutment disk 151. The first end of the spring 160 is mounted on the circular sleeve 150 to prevent excessive clearance between the spring 160 and the first recess 103, which could cause the spring 160 to move. The first end of the spring 160 elastically abuts the abutment disk 151, thereby pushing the abutment disk 151 into abutment with the connecting flange 400; the second end of the spring 160 elastically abuts the second protrusion 102.

[0039] In order to increase the deflection angle of the probe body in the connecting flange 400, thereby increasing the fault tolerance during RF probe testing; a guide portion protruding outward is provided at the connection between the first protrusion 101 and the first recess 103, and one end of the guide through hole 401 is provided with a guide groove adapted to the shape of the guide portion, and the guide portion extends into the guide groove. In this embodiment, the guide portion is an arcuate portion 122, and the guide groove is an arcuate groove 402. Of course, the guide portion and the guide groove can also be a cone with a larger upper portion and a smaller lower portion or other shapes that can guide. The first protrusion 101 and the arcuate portion 122 are preferably annular structures. A second gap 172 is left between the surface of the arcuate portion 122 and the groove wall of the arcuate groove 402, and the second gap 172 is connected to the first gap 171.

[0040] In order to more accurately reset the probe body after the test is completed, the width of the second gap 172 can be gradually reduced from one end connected to the first gap 171 to the other end. That is, under the premise of meeting the deflection requirements of the probe body, the gap between the housing 100 and the connecting flange 400 is made as small as possible, so that the minimum width of the second gap 172 is smaller than the width of the first gap 171, so that the probe body can be better reset when it returns to the initial state from the test state. If necessary, the upper end of the arc portion 122 can be basically fitted with the arc groove 402, that is, the minimum width of the second gap 172 is 0, thereby ensuring a more accurate reset of the probe body.

[0041] The first end of the housing 100 is provided with a first connecting cavity 111, and the second end of the housing 100 is provided with a second connecting cavity 141. The second connecting cavity 141 is shaped like a trumpet with a wide outer portion and a narrow inner portion. In this embodiment, the first connecting cavity 111 is provided at the first end of the first contact portion 110, and the second connecting cavity 141 is provided at the second end of the second contact portion 140.

[0042] See also Figure 6The probe structure 300 includes a first probe 310 and a second probe 320 connected to the first probe 310. The insulating structure 200 includes a first insulator 210 disposed adjacent to the first connecting cavity 111, a second insulator 220 disposed at the junction of the first and second probes 310, 320, and a third insulator 230 disposed adjacent to the second connecting cavity 141. The first end of the first probe 310 passes through the first insulator 210 and extends into the first connecting cavity 111. The second end of the first probe 310 passes through the second insulator 220 and connects to the first end of the second probe 320. The second end of the second probe 320 passes through the second insulator 220 and extends into the second connecting cavity 141.

[0043] To facilitate assembly of the probe structure 300 and achieve an insulated connection between the probe structure 300 and the housing 100, the first probe 310 includes a first body portion 311. The first end of the first body portion 311 is inserted into the first insulator 210 and is provided with a connecting needle 312. The connecting needle 312 extends into the first connecting cavity 111. A third protrusion 313 is provided near the first end of the first body portion 311. The second end of the first insulator 210 is provided with a first groove 211 that matches the third protrusion 313. The third protrusion 313 extends into the first groove 211 and abuts against the bottom of the first groove 211 to limit its position.

[0044] The second probe 320 includes a second body portion 321. A probe connecting portion 322 is provided at the first end of the second body portion 321. The probe connecting portion 322 is interference-fitted into the probe connecting slot 314. A detection portion 323 is provided at the second end of the second body portion 321. The detection portion 323 passes through the third insulator 230 and extends into the second connection cavity 141. The diameter of the second body portion 321 is equal to the diameters of the probe connecting portion 322 and the detection portion 323, so that the first end of the second body portion 321 abuts against the second insulator 220 and the second end abuts against the third insulator 230. The second probe 320 is generally an elastic probe, and its detection portion 323 can be elastically extended to reduce the abutting force when the detection portion 323 is connected to the test socket 500. The elastic probe is an existing accessory, and its internal elastic structure is not described in detail here.

[0045] Please continue reading Figure 4 、 Figure 5 and Figure 6To facilitate the securement of the insulating structure 200 and the probe structure 300, the second end of the first contact portion 110 is provided with a first latching slot 112 that communicates with the first connecting cavity 111. The first insulator 210 is disposed in the first latching slot 112. The dimensions of the first latching slot 112 and the first insulator 210 are both larger than those of the first connecting cavity 111, facilitating the securement of the first insulator 210 in the first latching slot 112. The second end of the second connecting portion 130 is provided with a second latching slot 132, and the second insulator 220 is disposed in the second latching slot 132. The second contact portion 140 is provided with a third latching slot 143 that communicates with the third connecting slot 142. The dimensions of the second latching slot 132 and the second insulator 220 are both larger than those of the third latching slot 143, facilitating the securement of the second insulator 220 in the second latching slot 132. The third slot 143 is connected to the second connection cavity 141 through a connecting through hole 144 . The third insulator 230 is disposed in the third slot 143 adjacent to one end of the connecting through hole 144 , and is fixed in the third slot 143 by abutting against the second end of the second body portion 321 .

[0046] See also Figures 1 to 6 During testing, the RF probe is initially in its initial state. Driven by the connecting flange 400, the RF probe as a whole moves downward in this initial state until the test socket 500 extends into the second connecting cavity 141 and the detection portion 323 abuts the metal core in the test socket 500. When the second probe 320 is an elastic probe, its detection portion 323 contracts toward the interior of the second main body, while the probe body continues to move downward with the connecting flange 400. This avoids the problem of the detection portion 323 blocking the movement of the probe body when a fixed detection portion 323 is used, causing the detection portion 323 to be subjected to excessive pressure and easily damaged. The elastic force within the elastic probe ensures that the detection portion 323 is in close contact with the metal core, thereby ensuring the test effect.

[0047] See also Figure 7 After the test socket 500 contacts the top wall of the second connection cavity 141, the probe body, due to the contact force, stops moving downward with the connection flange 400. The connection flange 400 then moves downward a distance due to the compression of the spring 160. The increased elastic force of the compressed spring 160 ensures a secure contact between the probe body and the test socket 500, ensuring stable testing. During this process, the arcuate portion 122 gradually emerges from the arcuate groove 402.

[0048] Due to positioning errors during the test process, the accuracy of the test socket 500 when it is inserted into the second connection cavity 141 cannot be guaranteed during automated testing. Since the second connection cavity 141 is a trumpet-shaped cavity with a wide outside and a narrow inside, it has a fault tolerance and guidance function when the position deviates. The probe body can be deflected to align the probe body with the test socket 500. Figure 8 When the arc portion 122 and the arc groove 402 are not provided on the housing 100 and the connecting flange 400 (i.e., the corresponding positions of the connecting flange 400 and the housing 100 adopt conventional structures), the deflection angle of the probe body is limited by the width of the first gap 171, and the fault tolerance is limited. Figure 9 In this embodiment, after the arc portion 122 and the arc groove 402 are provided, the deflection angle of the probe body can reach about 10° at the same width of the first gap 171, which greatly improves the fault tolerance during testing.

[0049] After the test is completed, the connecting flange 400 moves upward, so that the arc portion 122 gradually enters the arc groove 402, thereby gradually resetting the probe body and restoring the RF probe to its initial state. Figure 10 If the corresponding positions of the connecting flange 400 and the housing 100 adopt a conventional structure, during this process, due to the existence of the first gap, the probe body is easily offset in the guide through hole 401 (for example Figure 10 The offset distance is 0.2mm), so it cannot be accurately reset. In this embodiment, since the movement state of the arc portion 122 when the probe body is deflected is similar to that of a spherical rotation, it does not require a large gap to achieve the clearance. Therefore, the minimum width of the second gap can be very small. At this time, the guiding effect of the arc groove 402 on the arc portion 122 can reduce or avoid the offset of the probe body after resetting. Of course, if the guide portion and the guide groove are conical or other shapes, when the probe body stops moving, the guide portion will gradually emerge from the guide groove, thereby causing the guide groove to lose its limiting effect, which is equivalent to shortening the limiting length of the guide through hole 401, and can also increase the deflection angle of the probe body.

[0050] In this embodiment, by providing an arcuate portion 122 at the junction of the first recess 103 of the housing 100 and the corresponding arcuate groove 402 on the connecting flange 400, the deflection angle of the probe body can be greatly increased, thereby enhancing the fault tolerance of the RF probe during testing. Furthermore, by gradually reducing the width of the second gap 172 so that its minimum width is smaller than that of the first gap 171, displacement of the probe body after reset can be reduced or avoided.

[0051] The above embodiments merely represent preferred embodiments of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A radio frequency probe, characterized in that: It includes a probe body and a connecting flange sleeved on the probe body, the probe body includes an outer shell, an insulating structure arranged in the outer shell and a probe structure passed through the insulating structure; a guide through hole is provided in the middle of the connecting flange, the outer shell is passed through the guide through hole, and a first gap is left between the hole wall of the guide through hole and the outer shell; a first convex portion and a second convex portion are formed on the outer shell, thereby forming a first concave portion between the first convex portion and the second convex portion; the first end of the connecting flange abuts against the first convex portion, and the second end of the connecting flange elastically abuts against the second convex portion through an elastic structure; a guide portion protruding outward is provided at the connection between the first convex portion and the first concave portion, and a guide groove adapted to the shape of the guide portion is provided at one end of the guide through hole, and the guide portion extends into the guide groove.

2. The radio frequency probe according to claim 1, wherein: A second gap is left between the surface of the guide portion and the groove wall of the guide groove, and the second gap is communicated with the first gap.

3. The radio frequency probe according to claim 2, wherein: The width of the second gap gradually decreases from one end connected to the first gap to the other end, and the minimum width of the second gap is smaller than the width of the first gap.

4. The radio frequency probe according to claim 1, wherein: The guide portion is an arc-shaped portion, and the guide groove is an arc-shaped groove; the first convex portion and the arc-shaped portion are both annular structures.

5. The radio frequency probe according to claim 1, wherein: The elastic structure is a spring, and a circular sleeve is also provided on the first recessed portion. An abutment disk is provided at one end of the circular sleeve. The first end of the spring is provided on the circular sleeve and elastically abuts against the abutment disk, thereby pushing the abutment disk to abut against the connecting flange; the second end of the spring elastically abuts against the second protrusion.

6. The radio frequency probe according to any one of claims 1 to 5, characterized in that: A first connecting cavity is provided at the first end of the shell, and a second connecting cavity is provided at the second end of the shell. The second connecting cavity is in the shape of a trumpet that is wide on the outside and narrow on the inside. The probe structure includes a first probe and a second probe connected to the first probe. The insulating structure includes a first insulator provided adjacent to the first connecting cavity, a second insulator provided at the connection between the first probe and the second probe, and a third insulator provided adjacent to the second connecting cavity. The first end of the first probe passes through the first insulator and extends into the first connecting cavity. The second end of the first probe passes through the second insulator and is connected to the first end of the second probe. The second end of the second probe passes through the second insulator and extends into the second connecting cavity.

7. The radio frequency probe according to claim 6, wherein: The first probe includes a first body portion, a first end of the first body portion is inserted into the first insulator and is provided with a connecting needle, and the connecting needle extends into the first connecting cavity; a third protrusion is provided at a position near the first end of the first body portion, and a first groove adapted to the third protrusion is provided at the second end of the first insulator, and the third protrusion extends into the first groove and abuts against the bottom of the first groove for limiting position; a probe connecting groove is provided at the second end of the first body portion; The second probe includes a second body portion, a probe connecting portion is provided at the first end of the second body portion, and the probe connecting portion is connected to the probe connecting groove; a detection portion is provided at the second end of the second body portion, and the detection portion passes through the third insulator and extends into the second connecting cavity; the diameter of the second body portion is consistent with the diameter of the probe connecting portion and the detection portion, so that the first end of the second body portion abuts against the second insulator for a limited position, and the second end abuts against the third insulator for a limited position.

8. The radio frequency probe according to claim 6, wherein: The shell includes a first contact portion, a first connecting portion, a second connecting portion and a second contact portion, the first convex portion is arranged on the first connecting portion; the first end of the first connecting portion is connected to the second end of the first contact portion, and the first connecting cavity is arranged at the first end of the first contact portion; the second end of the first connecting portion is connected to the first end of the second connecting portion, and the second convex portion is arranged on the second connecting portion; the second end of the second connecting portion is connected to the first end of the second contact portion, and the second connecting cavity is arranged at the second end of the second contact portion.

9. The radio frequency probe according to claim 8, wherein: The first end of the first connecting portion is provided with a first connecting groove, and the second end of the first contact portion is connected to the first connecting groove; the first end of the second connecting portion is provided with a second connecting groove, and the second end of the first connecting portion is connected to the second connecting groove; the first end of the second contact portion is provided with a third connecting groove, and the second end of the second connecting portion is connected to the third connecting groove.

10. The radio frequency probe according to claim 9, wherein: The second end of the first contact portion is provided with a first card slot communicating with the first connecting cavity, and the first insulator is arranged in the first card slot, and the size of the first card slot and the size of the first insulator are both larger than the size of the first connecting cavity; the second end of the second connecting portion is provided with a second card slot, and the second insulator is arranged in the second card slot; the second contact portion is provided with a third card slot communicating with the third connecting slot, and the size of the second card slot and the size of the second insulator are both larger than the size of the third card slot; the third card slot is connected to the second connecting cavity through a connecting through hole, and the third insulator is arranged at one end of the third card slot adjacent to the connecting through hole.

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