A radio frequency probe

Abstract

This utility model discloses an RF probe, including a probe body and a connecting flange. A guide hole is provided in the middle of the connecting flange, and the probe body passes through the guide hole, with a first gap between the hole wall and the outer shell. An arc-shaped groove is formed at the upper part of the guide hole, and the probe body has an arc-shaped portion adapted to the shape of the arc-shaped groove. The connecting flange is connected to the probe body through an elastic structure, and the arc-shaped portion extends into the arc-shaped groove under the elastic force of the elastic structure. A second gap is provided between the surface of the arc-shaped portion and the groove wall of the arc-shaped groove, and the second gap communicates with the first gap. In this utility model, the arc-shaped groove on the connecting flange and the corresponding arc-shaped portion on the probe body, through the second gap between the arc-shaped portion and the arc-shaped groove, can greatly increase the deflection angle of the probe body, thereby increasing the fault tolerance of the RF probe during testing.

Description

Technical Field

[0001] This utility model belongs to the field of component testing, and in particular relates to an radio frequency probe. Background Technology

[0002] Radio frequency (RF) probes are primarily used to interface with test sockets on PCB circuit boards and other modules to test electronic components on the board. To achieve automated control of the RF probes for automatic testing, the probes must possess a certain deflection capability to accommodate positional differences caused by test socket installation errors or positioning deviations in the testing fixture. Current mainstream designs achieve limited deflection by leaving a tiny connection gap between the probe housing and the flange to meet the fault tolerance requirements of automated testing. However, to prevent misalignment due to excessive deflection after testing, this connection gap must be strictly controlled to be extremely small, significantly limiting the probe's actual fault tolerance angle—typically not exceeding 5°. This characteristic places higher demands on the installation accuracy of the test socket and the positioning accuracy of the testing fixture, requiring minimizing initial installation deviations to ensure smooth automated testing. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a radio frequency probe.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] A radio frequency probe includes a probe body and a connecting flange sleeved on the probe body. A guide hole is provided in the middle of the connecting flange, and the probe body passes through the guide hole, with a first gap between the hole wall and the outer shell. An arc-shaped groove is formed at the upper part of the guide hole, and the probe body has an arc-shaped portion adapted to the shape of the arc-shaped groove. The connecting flange is connected to the probe body through an elastic structure, and the arc-shaped portion extends into the arc-shaped groove under the elastic force of the elastic structure. A second gap is provided between the surface of the arc-shaped portion and the groove wall of the arc-shaped groove, and the second gap communicates with the first gap.

[0006] Furthermore, the width of the second gap gradually decreases from the end connected to the first gap to the other end, and the minimum width of the second gap is less than the width of the first gap.

[0007] Furthermore, the probe body includes a housing and an insulating structure and a probe structure disposed within the housing, the housing being disposed in a guide hole.

[0008] Furthermore, a first protrusion and a second protrusion are formed on the outer shell, thereby forming a first recess between the first protrusion and the second protrusion. The arc-shaped portion is disposed at the connection between the first protrusion and the first recess. The first end of the connecting flange abuts against the first protrusion, and the second end of the connecting flange elastically abuts against the second protrusion through an elastic structure.

[0009] Furthermore, the elastic structure is a spring, and a circular sleeve is also fitted on the first recess. One end of the circular sleeve is provided with an abutment plate. The first end of the spring is fitted on the circular sleeve and elastically abuts against the abutment plate, thereby pushing the abutment plate to abut against the connecting flange; the second end of the spring elastically abuts against the second protrusion.

[0010] Furthermore, the first end of the outer shell is provided with a first connecting cavity, and the second end of the outer shell is provided with a second connecting cavity, the second connecting cavity being funnel-shaped with a wider outer side and a narrower inner side; the probe structure includes a first probe and a second probe connected to the first probe; the insulation structure includes a first insulator disposed near the first connecting cavity, a second insulator disposed at the connection between the first probe and the second probe, and a third insulator disposed near 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 connects with 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, the first end of which passes through the first insulator and is provided with a connecting needle, the connecting needle extending into the first connecting cavity; the first body portion is provided with a third protrusion near its first end, the second end of the first insulator is provided with a first groove adapted to the third protrusion, the third protrusion extending into the first groove and abutting and limiting the groove bottom; the second end of the first body portion is provided with a probe connecting groove;

[0012] The second probe includes a second body portion, a probe connection portion at the first end of the second body portion, the probe connection portion being connected in a probe connection groove; a detection portion at the second end of the second body portion, the detection portion passing through the third insulator and extending into the second connection cavity; the diameter of the second body portion and the diameter of the probe connection portion and the detection portion are such that the first end of the second body portion abuts and limits contact with the second insulator, and the second end abuts and limits contact with the third insulator.

[0013] Furthermore, the outer casing includes a first contact portion, a first connecting portion, a second connecting portion, and a second contact portion. The first protrusion is disposed on the first connecting portion. A first end of the first connecting portion is connected to a second end of the first contact portion, and a first connecting cavity is disposed at the first end of the first contact portion. A second end of the first connecting portion is connected to a first end of the second connecting portion, and a second protrusion is disposed on the second connecting portion. A second end of the second connecting portion is connected to a first end of the second contact portion, and a second connecting cavity is disposed 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 slot communicating with the first connecting cavity, and the first insulator is disposed in the first slot. The size of the first 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 slot, and the second insulator is disposed in the second slot. The second contact portion is provided with a third slot communicating with the third connecting slot. The size of the second slot and the size of the second insulator are both larger than the size of the third slot. The third slot communicates with the second connecting cavity through a connecting through hole, and the third insulator is disposed in the third slot at one end adjacent to the connecting through hole.

[0016] In this invention, by providing an arc-shaped groove on the connecting flange and a corresponding arc-shaped portion on the probe body housing, the second gap between the arc-shaped portion and the arc-shaped groove can significantly increase the deflection angle of the probe body, thereby increasing the fault tolerance of the RF probe during testing. Furthermore, by designing the width of the second gap to gradually decrease, making the minimum width of the second gap smaller than the width of the first gap, it is also possible to reduce or prevent displacement of the probe body after reset. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

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

[0019] Figure 2 for Figure 1 The leaked photos.

[0020] Figure 3 for Figure 1 Top view.

[0021] Figure 4 for Figure 3 A sectional view along line AA.

[0022] Figure 5 This is a cross-sectional view of the shell.

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

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

[0025] Figure 8 A cross-sectional view of the flange in the deflection state when a conventional structure is used for connection.

[0026] Figure 9 This is a cross-sectional view of the embodiment in the deflection state.

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

[0028] The diagrams in the instruction manual are labeled as follows:

[0029] Outer shell - 100; First protrusion - 101; Second protrusion - 102; First recess - 103; First contact portion - 110; First connecting cavity - 111; First slot - 112; First connecting portion - 120; First connecting groove - 121; Arc-shaped portion - 122; Second recess - 123; Second connecting portion - 130; Second connecting groove - 131; Second slot - 132; Second contact portion - 140; Second connecting cavity - 141; Third connecting groove - 142; Third slot - 143; Connecting through hole - 144; Circular sleeve - 150; Abutment 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 part - 311; Connecting needle - 312; Third protrusion - 313; Probe connecting groove - 314; Second probe - 320; Second body part - 321; Probe connecting part - 322; Detection part - 323;

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

[0033] Test socket-500; metal core-510. Detailed Implementation

[0034] The following specific examples illustrate the implementation of this utility model. The illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 A preferred embodiment of the radio frequency probe of this utility model includes a probe body and a connecting flange 400 sleeved on the probe body. A guide hole 401 is provided in the middle of the connecting flange 400, and the probe body passes through the guide hole 401, with a first gap 171 between the hole wall of the guide hole 401 and the outer shell 100. Of course, the connecting flange 400 generally also has a mounting hole 403 on each side of the guide hole 401 to facilitate the automatic testing of the radio frequency probe on a testing fixture (not shown in the figure).

[0036] The probe body generally includes a housing 100, an insulating structure 200 disposed within the housing 100, and a probe structure 300 passing through the insulating structure 200. In this embodiment, a first protrusion 101 and a second protrusion 102 are formed on the housing 100, thereby forming a first recess 103 between the first protrusion 101 and the second protrusion 102. Please refer to [link / reference]. 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. A first protrusion 101 is disposed 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, and a second protrusion 102 is disposed on the second connecting portion 130. The 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] To increase the deflection angle of the probe body in the connecting flange 400, thereby increasing the fault tolerance during RF probe testing, an arc-shaped groove 402 is formed on the upper part of the guide through hole 401, and the probe body is provided with an arc-shaped portion 122 that matches the shape of the arc-shaped groove 402. The connecting flange 400 is connected to the probe body through an elastic structure, and the arc-shaped portion 122 extends into the arc-shaped groove 402 under the action of the elastic force formed by the elastic structure along the axial direction of the probe body. In this embodiment, the arc-shaped portion 122 is disposed at the connection between the first protrusion 101 and the first recess 103, and the first protrusion 101 and the arc-shaped portion 122 are preferably annular structures. A second gap 172 is left between the surface of the arc-shaped portion 122 and the groove wall of the arc-shaped groove 402, and the second gap 172 communicates with the first gap 171.

[0039] In this embodiment, the first end of the connecting flange 400 abuts against the first protrusion 101, and the second end of the connecting flange 400 elastically abuts against the second protrusion 102 via an elastic structure; the elastic structure is preferably a spring 160. A circular sleeve 150 may also be fitted onto the first recess 103, with an abutment plate 151 at one end. The first end of the spring 160 is fitted onto the circular sleeve 150 to prevent excessive gap between the spring 160 and the first recess 103, which could cause slippage. The first end of the spring 160 elastically abuts against the abutment plate 151, thereby pushing the abutment plate 151 against the connecting flange 400; the second end of the spring 160 elastically abuts against the second protrusion 102.

[0040] To ensure more accurate probe body repositioning after testing, the width of the second gap 172 can gradually decrease from the end connected to the first gap 171 to the other. That is, while meeting the deflection requirements of the probe body, the gap between the housing 100 and the connecting flange 400 is minimized, making the minimum width of the second gap 172 smaller than the width of the first gap 171, thus allowing for better repositioning of the probe body when returning to its initial state from the test state. If necessary, the upper end of the arc-shaped portion 122 can be substantially fitted with the arc-shaped groove 402, i.e., making the minimum width of the second gap 172 zero, thereby ensuring more accurate probe body repositioning.

[0041] The outer casing 100 has a first connecting cavity 111 at its first end and a second connecting cavity 141 at its second end. The second connecting cavity 141 is flared in shape, wider at the outside and narrower at the inside. In this embodiment, the first connecting cavity 111 is located at the first end of the first contact portion 110, and the second connecting cavity 141 is located at the second end of the second contact portion 140.

[0042] Please see Figure 6 The probe structure 300 includes a first probe 310 and a second probe 320 connected to the first probe 310. The insulation structure 200 includes a first insulator 210 disposed near the first connecting cavity 111, a second insulator 220 disposed at the connection between the first probe 310 and the second probe 320, and a third insulator 230 disposed near the second connecting cavity 141. A first end of the first probe 310 passes through the first insulator 210 and extends into the first connecting cavity 111; a second end of the first probe 310 passes through the second insulator 220 and is connected to the first end of the second probe 320. A second end of the second probe 320 passes through the second insulator 220 and extends into the second connecting cavity 141.

[0043] To facilitate the assembly of the probe structure 300 and to achieve an insulating connection between the probe structure 300 and the housing 100, the first probe 310 includes a first body portion 311. A first end of the first body portion 311 passes through the first insulator 210 and is provided with a connecting needle 312, which extends into the first connecting cavity 111. A third protrusion 313 is provided near the first end of the first body portion 311. A first groove 211, adapted to the third protrusion 313, is provided at the second end of the first insulator 210. The third protrusion 313 extends into the first groove 211 and abuts against and is positioned against the bottom of the first groove 211.

[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, and the probe connecting portion 322 is interference-fitted into the probe connecting groove 314. A detection portion 323 is provided at the second end of the second body portion 321, and the detection portion 323 passes through the third insulator 230 and extends into the second connecting cavity 141. The diameter of the second body portion 321 is equal to the diameter of the probe connecting portion 322 and the detection portion 323, thereby limiting the contact between the first end of the second body portion 321 and the second insulator 220, and the second end and the third insulator 230. The second probe 320 is generally an elastic probe, and its detection portion 323 can elastically expand and contract to reduce the contact force when the detection portion 323 is connected to the test base 500. The elastic probe is an existing accessory, and its internal elastic structure will not be described in detail here.

[0045] Please continue reading. Figure 4 , Figure 5 and Figure 6 To facilitate the fixing of the insulating structure 200 and the probe structure 300, the second end of the first contact portion 110 is provided with a first slot 112 communicating with the first connecting cavity 111. The first insulator 210 is disposed in the first slot 112. The size of the first slot 112 and the size of the first insulator 210 are both larger than the size of the first connecting cavity 111, so as to fix the first insulator 210 in the first slot 112. The second end of the second connecting portion 130 is provided with a second slot 132, and the second insulator 220 is disposed in the second slot 132. The second contact portion 140 is provided with a third slot 143 communicating with the third connecting slot 142. The size of the second slot 132 and the size of the second insulator 220 are both larger than the size of the third slot 143, so as to fix the second insulator 220 in the second slot 132. The third slot 143 is connected to the second connecting cavity 141 through a connecting through hole 144. The third insulator 230 is disposed in the third slot 143 near the connecting through hole 144, and is thus fixed in the third slot 143 by the second end of the second body part 321.

[0046] Please see Figures 1 to 6During testing, the RF probe initially moves downwards from its initial state under the influence of the connecting flange 400 until the test base 500 extends into the second connecting cavity 141, bringing the detection part 323 into contact with the metal core within the test base 500. When the second probe 320 is an elastic probe, its detection part 323 retracts into the second main body, while the probe body still moves downwards with the connecting flange 400. This avoids the problem of excessive pressure and potential damage to the detection part 323 caused by its obstruction of the probe body's movement when a fixed detection part 323 is used. Furthermore, the elastic force within the elastic probe ensures close contact between the detection part 323 and the metal core, guaranteeing the testing results.

[0047] Please see Figure 7 When the test seat 500 abuts against the cavity wall at the top of the second connecting cavity 141, the probe body, under the action of the abutment force, stops moving downward with the connecting flange 400. The connecting flange 400 then moves downward a certain distance via the compression spring 160. The increased elastic force after the spring 160 is compressed ensures a firm contact between the probe body and the test seat 500, facilitating test stability. During this process, the arc-shaped portion 122 gradually emerges from the arc-shaped groove 402.

[0048] Due to positioning errors and other factors during testing, the accuracy of the test holder 500 extending into the second connecting cavity 141 cannot be guaranteed during automated testing. Because the second connecting cavity 141 is flared (wider on the outside, narrower on the inside), it provides fault tolerance and guidance when positional deviations occur. The probe body can be deflected to align the probe body and the test holder 500. Please refer to [link to relevant documentation]. Figure 8 When the arc-shaped portion 122 and the arc-shaped groove 402 are not provided on the housing 100 and the connecting flange 400 (i.e., when the corresponding positions of the connecting flange 400 and the housing 100 adopt conventional structures), the deflection angle of the probe body is approximately 5° due to the width limitation of the first gap 171, resulting in limited fault tolerance. Please refer to... Figure 9 In this embodiment, after setting the arc-shaped part 122 and the arc-shaped groove 402, the deflection angle of the probe body can reach about 10° under 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, causing the arc-shaped part 122 to gradually enter the arc-shaped groove 402, thereby gradually resetting the probe body and restoring the RF probe to its initial state. Please refer to... Figure 10 If the corresponding positions of the connecting flange 400 and the housing 100 adopt a conventional structure, the probe body is prone to displacement in the guide hole 401 during this process due to the presence of the first gap (e.g., Figure 10The offset distance is 0.2mm, which makes accurate reset impossible. In this embodiment, since the movement state of the arc-shaped part 122 when the probe body deflects is similar to spherical rotation, a large gap is not required to make way. Therefore, the minimum width of the second gap can be very small. At this time, the guiding effect of the arc-shaped groove 402 on the arc-shaped part 122 can reduce or avoid the offset after the probe body is reset.

[0050] In this embodiment, by providing an arc-shaped groove 402 on the connecting flange 400 and a corresponding arc-shaped portion 122 at the connection between the first recess 103 and the first recess 103 of the housing 100, the deflection angle of the probe body can be greatly increased, thereby increasing the fault tolerance of the RF probe during testing. Furthermore, by designing the width of the second gap 172 to gradually decrease, making the minimum width of the second gap 172 smaller than the width of the first gap 171, the offset of the probe body after reset can also be reduced or avoided.

[0051] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A radio frequency probe, characterized by: The device includes a probe body and a connecting flange fitted onto the probe body. A guide hole is provided in the middle of the connecting flange, and the probe body passes through the guide hole, with a first gap between the hole wall and the outer shell. An arc-shaped groove is formed at the upper part of the guide hole, and the probe body has an arc-shaped portion that matches the shape of the arc-shaped groove. The connecting flange is connected to the probe body via an elastic structure, and the arc-shaped portion extends into the arc-shaped groove under the elastic force of the elastic structure. A second gap is provided between the surface of the arc-shaped portion and the groove wall of the arc-shaped groove, and the second gap communicates with the first gap.

2. A radio frequency probe as defined in claim 1, wherein: The width of the second gap gradually decreases from the end connected to the first gap to the other end, and the minimum width of the second gap is less than the width of the first gap.

3. The radio frequency probe of claim 1, wherein: The probe body includes a shell and an insulating structure and a probe structure disposed within the shell, the shell being inserted into a guide hole.

4. The radio frequency probe as described in claim 3, characterized in that: The outer casing has a first protrusion and a second protrusion, thereby forming a first recess between the first protrusion and the second protrusion. The arc-shaped portion is disposed at the connection between the first protrusion and the first recess. The first end of the connecting flange abuts against the first protrusion, and the second end of the connecting flange elastically abuts against the second protrusion through an elastic structure.

5. A radio frequency probe as claimed in claim 4, characterised in that: The elastic structure is a spring. A circular sleeve is also fitted on the first recess. One end of the circular sleeve is provided with an abutment plate. The first end of the spring is fitted on the circular sleeve and elastically abuts against the abutment plate, thereby pushing the abutment plate to abut against the connecting flange. The second end of the spring elastically abuts against the second protrusion.

6. A radio frequency probe as defined in claim 3, wherein: The first end of the outer shell is provided with a first connecting cavity, and the second end of the outer shell is provided with a second connecting cavity, the second connecting cavity being funnel-shaped with a wider outer side and a narrower inner side; the probe structure includes a first probe and a second probe connected to the first probe; the insulation structure includes a first insulator disposed near the first connecting cavity, a second insulator disposed at the connection between the first probe and the second probe, and a third insulator disposed near 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 connects with 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. A radio frequency probe as claimed in claim 6, characterised in that: The first probe includes a first body portion, a first end of which passes through a first insulator and is provided with a connecting needle, the connecting needle extending into a first connecting cavity; a third protrusion is provided near the first end of the first body portion, a second end of the first insulator is provided with a first groove adapted to the third protrusion, the third protrusion extending into the first groove and abutting and limiting the groove bottom; 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 connection portion at the first end of the second body portion, the probe connection portion being connected in a probe connection groove; a detection portion at the second end of the second body portion, the detection portion passing through the third insulator and extending into the second connection cavity; the diameter of the second body portion and the diameter of the probe connection portion and the detection portion are such that the first end of the second body portion abuts and limits contact with the second insulator, and the second end abuts and limits contact with the third insulator.

8. A radio frequency probe as defined in claim 6, wherein: The outer shell includes a first contact portion, a first connecting portion, a second connecting portion, and a second contact portion. A first protrusion is disposed on the first connecting portion. A first end of the first connecting portion is connected to a second end of the first contact portion, and a first connecting cavity is disposed at the first end of the first contact portion. A second end of the first connecting portion is connected to a first end of the second connecting portion, and a second protrusion is disposed on the second connecting portion. A second end of the second connecting portion is connected to a first end of the second contact portion, and a second connecting cavity is disposed at the second end of the second contact portion.

9. A radio frequency probe as claimed in claim 8, characterised in that: The first end of the first connecting part is provided with a first connecting groove, and the second end of the first contact part is connected to the first connecting groove; the first end of the second connecting part is provided with a second connecting groove, and the second end of the first connecting part is connected to the second connecting groove; the first end of the second contact part is provided with a third connecting groove, and the second end of the second connecting part is connected to the third connecting groove.

10. A radio frequency probe as claimed in claim 9, characterized in that: The second end of the first contact portion is provided with a first slot communicating with the first connecting cavity, and the first insulator is disposed in the first slot. The size of the first 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 slot, and the second insulator is disposed in the second slot. The second contact portion is provided with a third slot communicating with a third connecting slot. The size of the second slot and the size of the second insulator are both larger than the size of the third slot. The third slot communicates with the second connecting cavity through a connecting through hole, and the third insulator is disposed in the third slot at one end adjacent to the connecting through hole.

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