Terminal block shielding structure with improved structure

Abstract

The invention discloses a terminal block shielding structure with an improved structure, which comprises a metal shell and a shielding terminal, one end, opposite to a circuit board welded with the terminal block, of the terminal block is an upper end, the metal shell covers the surface of the upper end of an outer flange of the terminal block, the metal shell is fixedly connected with the terminal block, and the shielding terminal comprises a grounding pin and an elastic contact part. The shielding terminal can be fixedly installed on the terminal block outer side flange, the grounding pin can stretch out of the terminal block outer side flange and is electrically connected with the circuit board to achieve grounding, the elastic contact part can elastically deform up and down, and the elastic contact part can stretch out of the upper end surface of the terminal block outer side flange and tightly abut against the lower end face of the metal shell. According to the invention, through stable contact conduction between the metal shell and the elastic contact part of the shielding terminal, the shielding structure is ensured to fully shield external interference signals, and the service life of the shielding structure is prolonged.

Description

Technical Field

[0001] The invention relates to a pluggable terminal block, in particular to a terminal block shielding structure with improved structure. Background Art

[0002] At present, the conductive structure of the metal shell of the plug-in terminal block harness and the metal shielding terminals installed on the flanges on both sides is as follows: a nut is installed in the outer flanges on both sides of the terminal block respectively, one end of the shielding terminal extends into the outer flange and closely contacts the nut, and the other end of the shielding terminal forms a grounding foot for grounding. Perforations are provided on one end of the shielding terminal and the metal shell. The screw of the bolt passes through the perforation on the metal shell and then is inserted into the outer flange and passes through the perforation at one end of the shielding terminal, and is finally screwed on the nut, that is, indirect conduction is achieved through the screw teeth of the bolt and the nut to realize the grounding function. The conductive transmission mode of the metal shell and the shielding terminal is: metal shell-threaded screw teeth-shielding terminal-grounding. This structure causes the grounding connection of the metal shell to be unstable, which is prone to short circuit, affecting the shielding effect of external interference signals. Summary of the invention

[0003] In order to make up for the above deficiencies, the present invention provides a terminal block shielding structure with improved structure. The terminal block shielding structure with improved structure has stable electrical signal transmission, good shielding effect on external interference signals and long service life.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a structurally improved terminal block shielding structure, including a metal shell and a shielding terminal, wherein the end of the terminal block facing away from the circuit board welded to it is set as the upper end, the metal shell covers the upper end surface of the outer flange of the terminal block, the metal shell is fixedly connected to the terminal block, the shielding terminal includes a grounding pin and an elastic contact portion, the shielding terminal can be fixedly installed on the outer flange of the terminal block, the grounding pin can extend out of the outer flange of the terminal block and be electrically connected to the circuit board to achieve grounding, the elastic contact portion can be elastically deformed up and down, and the elastic contact portion can extend out of the upper end surface of the outer flange of the terminal block and tightly abut against the lower end surface of the metal shell.

[0005] As a further improvement of the present invention, at least one retaining groove is provided on the side wall of the outer flange of the terminal block, and a retaining portion corresponding to the retaining groove is provided on the shielding terminal, and each retaining portion can be inserted into the retaining groove one by one, and a plurality of raised barb structures are provided on the side wall of the retaining portion of the shielding terminal, and the raised barb structures can be embedded in the inner side wall of the retaining groove to realize a fixed connection between the retaining portion of the shielding terminal and the outer flange of the terminal block.

[0006] As a further improvement of the present invention, the shielding terminal also includes an L-shaped terminal body, which is covered on the upper end surface and side surface of the outer flange of the terminal block. The elastic contact portion is an elastic arm structure that is bent upward obliquely from one end of the L-shaped terminal body that is covered on the upper end surface of the outer flange of the terminal block. The retaining portion is a sheet structure that is horizontally bent from one end of the L-shaped terminal body that is covered on the side surface of the outer flange of the terminal block. The grounding foot is an L-shaped structure arranged at one end of the L-shaped terminal body that is covered on the side surface of the outer flange of the terminal block.

[0007] As a further improvement of the present invention, the two retaining portions are symmetrically distributed on both sides of the grounding pin.

[0008] As a further improvement of the present invention, the upper end surface and side surface of the outer flange of the terminal block are also provided with a receiving groove matching the L-shaped terminal body of the shielding terminal, and the L-shaped terminal body of the shielding terminal can be accommodated in the receiving groove.

[0009] As a further improvement of the present invention, the upper end surface of the outer flange of the terminal block is also provided with an avoidance groove directly opposite to the elastic contact portion of the shielding terminal, and the elastic contact portion of the shielding terminal can be pressed downward to be accommodated in the avoidance groove.

[0010] As a further improvement of the present invention, the elastic contact portion of the shielding terminal is located at the end of the elastic arm structure to form a downwardly bent arc contact surface.

[0011] As a further improvement of the present invention, a connecting through hole is provided on the metal shell, a connecting nut is fixedly provided in the outer flange of the terminal block, an avoidance through hole opposite to the connecting nut is also provided on the outer flange of the terminal block, an avoidance notch opposite to the connecting nut is also provided on the L-shaped terminal body of the shielding terminal, and a connecting bolt is also provided. The stud of the connecting bolt passes through the connecting through hole on the metal shell, the avoidance notch on the L-shaped terminal body of the shielding terminal and the avoidance through hole on the outer flange of the terminal block and is finally screwed and locked with the connecting nut so that the metal shell is fixedly connected to the outer flange of the terminal block.

[0012] As a further improvement of the present invention, the L-shaped terminal body of the shielding terminal covers one end of the upper end surface of the outer flange of the terminal block to form a V-shaped structure, one side arm of the V-shaped structure is flat against the upper end surface of the outer flange of the block, and the other side arm of the V-shaped structure is bent to form an elastic contact portion, and concave avoidance notches are respectively formed on the opposite side walls of the two side arms of the V-shaped structure.

[0013] As a further improvement of the present invention, the terminal block is provided with an outer flange at both ends along the direction of arrangement of the inner terminals, and the two shielding terminals are respectively installed on the two outer flanges. The metal shell is sleeved on the outside of the terminal block and completely covers the pins of each terminal of the terminal block extending out of the outside of the terminal block and the shielding terminals.

[0014] The beneficial technical effects of the present invention are as follows: the present invention realizes a fixed connection between the shielding terminal and the outer flange of the terminal block by arranging a retaining portion on the shielding terminal, and realizes conduction by arranging an elastic contact portion that can elastically deform up and down on the shielding terminal to elastically contact the metal shell directly, thereby realizing a grounding effect. The present invention also provides positive pressure to the elastic contact portion between the metal shell and the shielding terminal by locking the connecting bolts and the connecting nuts, thereby ensuring stable contact and conduction between the elastic contact portion between the metal shell and the shielding terminal, ensuring sufficient shielding of the shielding structure against external interference signals, and improving the service life of the shielding structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural principle diagram of the prior art;

[0016] Figure 2 It is a structural principle diagram of the present invention;

[0017] Figure 3 A three-dimensional diagram of the shielding terminal of the present invention installed on the outer flange of the terminal block;

[0018] Figure 4 for Figure 3 Enlarged view of part A in the middle;

[0019] Figure 5 A three-dimensional diagram of the shielding structure of the present invention;

[0020] Figure 6 It is a first stereoscopic view of the shielding terminal of the present invention;

[0021] Figure 7 This is a second stereoscopic view of the shielding terminal of the present invention. DETAILED DESCRIPTION

[0022] Embodiment: A structurally improved terminal block 3 shielding structure includes a metal shell 1 and a shielding terminal 2, wherein the end of the terminal block 3 facing away from the circuit board welded thereto is assumed to be the upper end, the metal shell 1 covers the upper end surface of the outer flange 4 of the terminal block, the metal shell 1 is fixedly connected to the terminal block 3, the shielding terminal 2 includes a grounding pin 22 and an elastic contact portion 23, the shielding terminal 2 can be fixedly mounted on the outer flange 4 of the terminal block, the grounding pin 22 can extend out of the outer flange 4 of the terminal block and be electrically connected to the circuit board to achieve grounding, the elastic contact portion 23 can be elastically deformed up and down, and the elastic contact portion 23 can extend out of the upper end surface of the outer flange 4 of the terminal block and tightly abut against the lower end surface of the metal shell 1.

[0023] This structure fixes the shielding terminal 2 and the metal shell 1 on the outer flange of the terminal block 3, and the elastic contact portion 23 on the shielding terminal 2 is tightly pressed against the lower end surface of the metal shell 1, so that the metal shell 1 is in direct contact and conduction with the shielding terminal 2, ensuring the stability of the grounding signal and the stable shielding effect of the terminal block 3 against external interference signals. This structure can also maintain stable contact between the metal shell 1 and the shielding terminal 2 during long-term use, and has a long service life.

[0024] At least one retaining groove 41 is provided on the side wall of the outer flange 4 of the terminal block, and a retaining portion 21 corresponding to the retaining groove 41 is provided on the shielding terminal 2. Each retaining portion 21 can be inserted into the retaining groove 41 in a one-to-one manner. A plurality of raised barb structures 211 are provided on the side wall of the retaining portion 21 of the shielding terminal 2. The raised barb structures 211 can be embedded in the inner side wall of the retaining groove 41 to achieve a fixed connection between the retaining portion 21 of the shielding terminal 2 and the outer flange 4 of the terminal block. After the shielding terminal 2 is inserted into the retaining groove 41 on the outer flange 4 of the terminal block through the retaining portion 21, the barb structures 211 on the side wall of the retaining portion 21 are embedded in the inner side wall of the retaining groove 41 on the outer flange 4 of the terminal block to achieve fixed positioning of the shielding terminal 2 and the outer flange 4 of the terminal block. In addition, the shielding terminal 2 can also be fixedly connected to the outer flange 4 of the terminal block in other ways, such as one-piece molding by in-mold injection, fixed buckling by snaps, or fixed connection by connectors, etc.

[0025] The shielding terminal 2 also includes an L-shaped terminal body 24, which is covered on the upper surface and side of the terminal block outer flange 4. The elastic contact portion 23 is an elastic arm structure that is bent upward from one end of the L-shaped terminal body 24 covering the upper surface of the terminal block outer flange 4. The retaining portion 21 is a sheet structure that is horizontally bent from one end of the L-shaped terminal body 24 covering the side of the terminal block outer flange 4. The grounding foot 22 is an L-shaped structure provided at one end of the L-shaped terminal body 24 covering the side of the terminal block outer flange 4. The shielding terminal 2 is made of metal sheets directly stamped and bent, and the terminal body 24 is covered on the outside of the terminal block outer flange 4, which ensures the stable connection between the shielding terminal 2 and the terminal block outer flange 4.

[0026] The two retaining portions 21 are symmetrically distributed on both sides of the grounding pin 22. The symmetrically arranged retaining portions 21 can improve the connection stability between the shielding terminal 2 and the outer flange 4 of the terminal block.

[0027] The upper end surface and side surface of the terminal block outer flange 4 are also provided with a receiving groove 42 matching the L-shaped terminal body 24 of the shielding terminal 2, and the L-shaped terminal body 24 of the shielding terminal 2 can be received in the receiving groove 42. The L-shaped terminal body 24 of the shielding terminal 2 is received by the receiving groove 42, so that it will not be exposed on the surface of the terminal block outer flange 4, avoiding interference with other parts, and the shielding terminal 2 can be further positioned.

[0028] The upper end surface of the terminal block outer flange 4 is also provided with an escape groove 43 directly facing the elastic contact portion 23 of the shielding terminal 2. The elastic contact portion 23 of the shielding terminal 2 is pressed downward and can be accommodated in the escape groove 43. The above structure allows the elastic contact portion 23 of the shielding terminal 2 to swing elastically in a relatively large range, thereby improving contact stability.

[0029] The elastic contact portion 23 of the shielding terminal 2 is located at the end of the elastic arm structure to form a downwardly bent arc contact surface 231 to prevent scratching the lower end surface of the metal shell 1.

[0030] The metal housing 1 is provided with a connection through hole, a connection nut 6 is fixedly provided in the outer flange 4 of the terminal block, an escape through hole directly opposite to the connection nut 6 is also provided on the outer flange 4 of the terminal block, an escape notch 241 directly opposite to the connection nut 6 is also provided on the L-shaped terminal body 24 of the shielding terminal 2, and a connection bolt 5 is also provided. The stud of the connection bolt 5 passes through the connection through hole on the metal housing 1, the escape notch 241 on the L-shaped terminal body 24 of the shielding terminal 2 and the escape through hole on the outer flange 4 of the terminal block, and is finally screwed and locked with the connection nut 6 so that the metal housing 1 is fixedly connected to the outer flange 4 of the terminal block. The positive pressure between the metal housing 1 and the shielding terminal 2 is provided by locking the connection bolt 5 and the connection nut 6, and the metal housing 1 is fixedly positioned on the terminal block 3.

[0031] The L-shaped terminal body 24 of the shielding terminal 2 covers one end of the upper surface of the outer flange 4 of the terminal block to form a V-shaped structure. One side arm of the V-shaped structure is flat against the upper surface of the outer flange of the block, and the other side arm of the V-shaped structure is bent to form an elastic contact portion 23. Concave avoidance notches 241 are respectively formed on the opposite side walls of the two side arms of the V-shaped structure.

[0032] The terminal block 3 is provided with an outer flange at both ends along the direction in which the inner terminals are arranged, and two shielding terminals 2 are respectively installed on the two outer flanges. The metal shell 1 is sleeved on the outside of the terminal block 3 and completely covers the pins of each terminal of the terminal block 3 extending out of the outside of the terminal block 3 and the shielding terminals 2.

Claims

1. A terminal block shielding structure with improved structure, comprising a metal shell (1) and a shielding terminal (2), wherein the end of the terminal block (3) facing away from the circuit board connected thereto by welding is the upper end, and the metal shell covers the upper end surface of the outer flange (4) of the terminal block, wherein: The metal shell is fixedly connected to the terminal block, and the shielding terminal comprises a grounding pin (22) and an elastic contact portion (23). The shielding terminal can be fixedly mounted on an outer flange of the terminal block, the grounding pin can extend out of the outer flange of the terminal block and be electrically connected to the circuit board to achieve grounding, and the elastic contact portion can be elastically deformed up and down, and the elastic contact portion can extend out of the upper end surface of the outer flange of the terminal block and tightly abut against the lower end surface of the metal shell.

2. The terminal block shielding structure with improved structure according to claim 1 is characterized by: At least one retaining groove (41) is provided on the side wall of the outer flange of the terminal block, and a retaining portion (21) corresponding to the retaining groove is provided on the shielding terminal, and each retaining portion can be inserted into the retaining groove in a one-to-one manner. A plurality of raised barb structures (211) are provided on the side wall of the retaining portion of the shielding terminal, and the raised barb structures can be embedded in the inner side wall of the retaining groove to realize a fixed connection between the retaining portion of the shielding terminal and the outer flange of the terminal block.

3. The terminal block shielding structure with improved structure according to claim 2 is characterized by: The shielding terminal also includes an L-shaped terminal body (24), which is covered on the upper end surface and side surface of the outer flange of the terminal block. The elastic contact portion is an elastic arm structure that is bent upward at an angle from one end of the L-shaped terminal body that is covered on the upper end surface of the outer flange of the terminal block. The retaining portion is a sheet structure that is horizontally bent from one end of the L-shaped terminal body that is covered on the side surface of the outer flange of the terminal block. The grounding foot is an L-shaped structure provided at one end of the L-shaped terminal body that is covered on the side surface of the outer flange of the terminal block.

4. The terminal block shielding structure with improved structure according to claim 3 is characterized by: The two retaining portions are symmetrically distributed on both sides of the grounding pin.

5. The terminal block shielding structure with improved structure according to claim 3 is characterized by: An accommodating groove (42) matching the L-shaped terminal body of the shielding terminal is also provided on the upper end surface and the side surface of the outer flange of the terminal station, and the L-shaped terminal body of the shielding terminal can be accommodated in the accommodating groove.

6. The terminal block shielding structure with improved structure according to claim 3 is characterized by: The upper end surface of the outer flange of the terminal block is also provided with an escape groove (43) directly facing the elastic contact part of the shielding terminal, and the elastic contact part of the shielding terminal can be accommodated in the escape groove when it is pressed to move downward.

7. The terminal block shielding structure with improved structure according to claim 3 is characterized by: The elastic contact portion of the shielding terminal is located at the end of the elastic arm structure to form a circular arc contact surface (231) bent downward.

8. The terminal block shielding structure with improved structure according to claim 3 is characterized by: The metal shell is provided with a connecting through hole, a connecting nut (6) is fixedly provided in the outer flange of the terminal block, an avoidance through hole opposite to the connecting nut is also provided on the outer flange of the terminal block, an avoidance notch (241) opposite to the connecting nut is also provided on the L-shaped terminal body of the shielding terminal, and a connecting bolt (5) is also provided, the stud of the connecting bolt passes through the connecting through hole on the metal shell, the avoidance notch on the L-shaped terminal body of the shielding terminal and the avoidance through hole on the outer flange of the terminal block, and is finally screwed and locked with the connecting nut so that the metal shell is fixedly connected to the outer flange of the terminal block.

9. The terminal block shielding structure with improved structure according to claim 8 is characterized by: The L-shaped terminal body of the shielding terminal covers one end of the upper end surface of the outer flange of the terminal block to form a V-shaped structure, one side arm of the V-shaped structure is flat against the upper end surface of the outer flange of the block, and the other side arm of the V-shaped structure is bent to form an elastic contact portion, and concave avoidance notches are respectively formed on the opposite side walls of the two side arms of the V-shaped structure.

10. The terminal block shielding structure with improved structure according to claim 1, characterized in that: The terminal block is provided with an outer flange at both ends along the direction in which the inner terminals are arranged, and two shielding terminals are respectively installed on the two outer flanges. The metal shell is sleeved on the outside of the terminal block and completely covers the pins of each terminal of the terminal block extending out of the outside of the terminal block and the shielding terminals.

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