Elastic grounding structure for shielding terminal of terminal block

Abstract

The invention discloses an elastic grounding structure for a shielding terminal of a terminal block, which is characterized in that an accommodating slot is arranged in a flange on the outer side of the terminal block, and a positioning connecting end of the shielding terminal and a connecting nut are inserted into the accommodating slot in an up-and-down stacked manner; the connecting bolt sequentially penetrates through the metal shell and the penetrating hole in the upper side wall of the terminal block outer side flange containing slot and is finally screwed and locked with the connecting nut, the positioning connecting end of the shielding terminal is tightly clamped between the upper side wall of the terminal block outer side flange containing slot and the connecting nut, and the shielding terminal is further provided with an elastic contact part which can elastically deform up and down. And an elastic contact part at one end of the shielding terminal extends out of the outer side of the upper end of the terminal block outer side flange through a hollow avoiding opening in the upper side wall of the terminal block outer side flange accommodating slot and elastically abuts against the surface of the lower end of the metal shell. 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 plug-in terminal block, and in particular to an elastic grounding structure of a terminal block shielding terminal. 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 shortcomings, the present invention provides an elastic grounding structure for terminal block shielding terminals, which 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 terminal block shielding terminal elastic grounding structure, including a metal shell, a shielding terminal, a connecting bolt and a connecting nut, 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, and a receiving slot is arranged in the outer flange of the terminal block. One end of the shielding terminal is a positioning connection end, and the other end of the shielding terminal is a grounding pin that can be electrically connected to the circuit board to achieve grounding. The positioning connection end and the connecting nut of the shielding terminal are stacked up and down and inserted into the receiving slot. The metal shell and the upper side wall of the receiving slot of the outer flange of the terminal block are provided with connecting The threaded hole of the connecting nut is opposite to the through hole, and the connecting bolts sequentially pass through the through holes of the metal shell and the upper side wall of the terminal block outer flange accommodating slot and are finally screwed and locked with the connecting nut. The positioning connection end of the shielding terminal is tightly clamped between the upper side wall of the terminal block outer flange accommodating slot and the connecting nut. An elastic contact portion that can elastically deform up and down is also provided on one end of the shielding terminal. The upper side wall of the terminal block outer flange accommodating slot is also provided with a hollow avoidance opening for the elastic contact portion of one end of the shielding terminal to extend to the outer side of the upper end of the outer flange of the terminal. The elastic contact portion of one end of the shielding terminal extends out of the upper end of the outer flange of the terminal block through the hollow avoidance opening and elastically presses against the lower end surface of the metal shell.

[0005] As a further improvement of the present invention, the accommodating slot on the inner side of the outer flange of the terminal block is a square slot, and the connecting nut is a square nut matching the shape of the accommodating slot.

[0006] As a further improvement of the present invention, the positioning connection end and the grounding foot of the shielding terminal are connected by a connecting body extending vertically to form a Z-shaped integrated structure, and the connecting body of the shielding terminal is covered on the outer flange side of the terminal block.

[0007] As a further improvement of the present invention, a terminal accommodating groove matching the connecting body of the shielding terminal is formed on the side surface of the outer flange of the terminal block, the connecting body of the shielding terminal is accommodated in the terminal accommodating groove, and the connecting body surface and the lower end surface of the shielding terminal are respectively aligned with the side surface and the lower end surface of the outer flange of the terminal block.

[0008] As a further improvement of the present invention, the positioning connection end of the shielding terminal is an L-shaped sheet whose length on one side along the depth direction of the accommodating slot is shorter than the length on the other side, and the elastic contact portion is an elastic arm structure extending obliquely upward from the shorter side of the L-shaped sheet, and the free end of the elastic arm structure elastically presses against the lower end surface of the metal shell.

[0009] 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.

[0010] As a further improvement of the present invention, a relief hole is provided on the positioning connection end of the shielding terminal, which is directly opposite to the threaded hole of the connecting nut, and the connecting bolt can pass through the relief hole and be threadedly connected with the connecting nut.

[0011] 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.

[0012] The beneficial technical effect of the present invention is as follows: the present invention provides an elastic contact portion that can elastically deform up and down on the positioning connection end of the shielding terminal, and the elastic contact portion directly elastically contacts the metal shell to achieve conduction, thereby achieving a grounding effect. The present invention also provides positive pressure to the elastic contact portion of the metal shell and the shielding terminal by locking the connecting bolts and the connecting nuts, thereby ensuring stable contact and conduction between the metal shell and the elastic contact portion of the shielding terminal, ensuring that the shielding structure fully shields external interference signals, and improving the service life of the shielding structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural principle diagram of the prior art;

[0014] Figure 2 It is a structural principle diagram of the present invention;

[0015] Figure 3 A three-dimensional diagram of the shielding terminal of the present invention installed on the outer flange of the terminal block;

[0016] Figure 4 for Figure 3 Enlarged view of part A in the middle;

[0017] Figure 5 A three-dimensional diagram of the shielding structure of the present invention;

[0018] Figure 6 It is a first stereoscopic view of the shielding terminal of the present invention;

[0019] Figure 7 This is a second stereoscopic view of the shielding terminal of the present invention. DETAILED DESCRIPTION

[0020] Embodiment: A terminal block shielding terminal elastic grounding structure, including a metal shell 1, a shielding terminal 2, a connecting bolt 6 and a connecting nut 5, wherein the end of the terminal block 3 facing away from the circuit board welded thereto is set as the upper end, the metal shell 1 covers the upper end surface of the outer flange 4 of the terminal block, and a receiving slot 41 is arranged in the outer flange 4 of the terminal block, one end of the shielding terminal 2 is a positioning connection end 21, and the other end of the shielding terminal 2 is a grounding pin 22 that can be electrically connected to the circuit board to achieve grounding, the positioning connection end 21 of the shielding terminal 2 and the connecting nut 5 are stacked up and down and inserted into the receiving slot 41, and the upper side walls of the metal shell 1 and the receiving slot 41 of the outer flange 4 of the terminal block are both provided with a threaded hole that is directly opposite to the threaded hole of the connecting nut 5. Hole, the connecting bolt 6 sequentially passes through the through holes on the metal shell 1 and the upper side wall of the receiving slot 41 of the outer flange 4 of the terminal block and is finally screwed and locked with the connecting nut 5. The positioning connection end 21 of the shielding terminal 2 is tightly clamped between the upper side wall of the receiving slot 41 of the outer flange 4 of the terminal block and the connecting nut 5. An elastic contact portion 23 that can elastically deform up and down is also provided on one end of the shielding terminal 2. A hollow avoidance opening 42 is provided on the upper side wall of the receiving slot 41 of the outer flange 4 of the terminal block for the elastic contact portion 23 at one end of the shielding terminal 2 to extend to the outer side of the upper end of the outer flange of the terminal. The elastic contact portion 23 at one end of the shielding terminal 2 extends out of the upper end of the outer flange 4 of the terminal block through the hollow avoidance opening 42 and elastically presses against the lower end surface of the metal shell 1.

[0021] The structure fixes the metal shell 1 on the upper end face of the outer flange of the terminal block 3 through the connecting bolts 6 and the connecting nuts 5, and at the same time fixes the shielding terminal 2 on the outer flange of the terminal block 3. The connecting bolts 6 and the connecting nuts 5 are locked to provide positive pressure between the metal shell 1 and the shielding terminal 2, so that the elastic contact part 23 on the shielding terminal 2 is tightly against the lower end face 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. The 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.

[0022] The receiving slot 41 inside the terminal block outer flange 4 is a square slot, and the connecting nut 5 is a square nut matching the shape of the receiving slot 41. The square structure can prevent the connecting nut 5 from rotating when the connecting bolt 6 is tightened, and the connecting nut 5 and the positioning connecting end 21 of the shielding terminal 2 can also be integrally formed in the receiving slot 41 of the terminal block outer flange 4 by injection molding to achieve fixed connection with the terminal block outer flange 4.

[0023] The positioning connection end 21 and the grounding foot 22 of the shielding terminal 2 are connected to form a Z-shaped integrated structure through a connecting body 24 extending vertically. The connecting body 24 of the shielding terminal 2 is covered on the side of the outer flange 4 of the terminal block.

[0024] A terminal accommodating groove 43 matching the connecting body 24 of the shielding terminal 2 is formed on the side surface of the outer flange 4 of the terminal block. The connecting body 24 of the shielding terminal 2 is accommodated in the terminal accommodating groove 43, and the surface and lower end surface of the connecting body 24 of the shielding terminal 2 are respectively aligned with the side surface and lower end surface of the outer flange 4 of the terminal block.

[0025] The connecting body 24 of the shielding terminal 2 is accommodated in the accommodating groove so that it will not be exposed on the surface of the flange 4 outside the terminal block to avoid interference with other parts. The shielding terminal 2 can also be further positioned to ensure the connection stability and position accuracy between the shielding terminal 2 and the external flange of the terminal block 3.

[0026] The positioning connection end 21 of the shielding terminal 2 is an L-shaped sheet material with a length of one side along the depth direction of the receiving slot 41 being shorter than the length of the other side, and the elastic contact portion 23 is an elastic arm structure extending obliquely upward from the shorter side of the L-shaped sheet material, and the free end of the elastic arm structure elastically and tightly abuts against the lower end surface of the metal housing 1. The shielding terminal 2 is formed by directly stamping and bending a metal sheet material, thereby improving the production efficiency of the shielding terminal 2 and the strength of the elastic contact portion 23.

[0027] The elastic contact portion 23 of the shielding terminal 2 is located at the end of the elastic arm structure to form a circular arc contact surface 231 bent downward to prevent scratching the lower end surface of the metal shell 1.

[0028] The positioning connection end 21 of the shielding terminal 2 is provided with an avoidance hole 25 which is directly opposite to the threaded hole of the connection nut 5, and the connection bolt 6 can pass through the avoidance hole 25 and be threadedly connected with the connection nut 5. In this way, the width of the side with a longer L-shaped sheet of the positioning connection end 21 of the shielding terminal 2 can be designed to be relatively wide, thereby increasing its positioning strength in the outer flange 4 of the terminal block, and the positioning connection end 21 of the shielding terminal 2 can be further limited by plugging the connection bolt 6 and the avoidance hole 25, thereby preventing the positioning connection end 21 of the shielding terminal 2 from coming out of the outer flange 4 of the terminal block.

[0029] 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 terminal elastic grounding structure, comprising a metal shell (1), a shielding terminal (2), a connecting bolt (6) and a connecting nut (5), wherein the end of the terminal block (3) facing away from the circuit board welded thereto is set as the upper end, the metal shell covers the upper end surface of the outer flange (4) of the terminal block, a receiving slot (41) is provided in the outer flange of the terminal block, one end of the shielding terminal is a positioning connection end (21), and the other end of the shielding terminal is a grounding pin (22) that can be electrically connected to the circuit board to achieve grounding, the positioning connection end and the connecting nut of the shielding terminal are stacked up and inserted into the receiving slot, and the characteristics are: The metal shell and the upper side wall of the terminal block outer flange receiving slot are both provided with through holes that are directly opposite to the threaded holes of the connecting nut. The connecting bolts sequentially pass through the through holes of the metal shell and the upper side wall of the terminal block outer flange receiving slot and are finally screwed and locked with the connecting nut. The positioning connection end of the shielding terminal is tightly clamped between the upper side wall of the terminal block outer flange receiving slot and the connecting nut. An elastic contact portion (23) that can be elastically deformed up and down is also provided on one end of the shielding terminal. The upper side wall of the terminal block outer flange receiving slot is also provided with a hollow avoidance opening (42) for the elastic contact portion of one end of the shielding terminal to extend to the outer side of the upper end of the terminal outer flange. The elastic contact portion of one end of the shielding terminal extends out of the outer side of the upper end of the terminal block outer flange through the hollow avoidance opening and elastically presses against the lower end surface of the metal shell.

2. The terminal block shielding terminal elastic grounding structure according to claim 1, characterized in that: The receiving slot inside the outer flange of the terminal block is a square slot, and the connecting nut is a square nut matching the shape of the receiving slot.

3. The terminal block shielding terminal elastic grounding structure according to claim 1 or 2, characterized in that: The positioning connection end and the grounding foot of the shielding terminal are connected to form a Z-shaped integrated structure through a connecting body (24) extending vertically, and the connecting body of the shielding terminal is covered on the side of the flange outside the terminal block.

4. The terminal block shielding terminal elastic grounding structure according to claim 3 is characterized by: A terminal accommodating groove (43) matching the connecting body of the shielding terminal is formed on the outer flange side of the terminal block, the connecting body of the shielding terminal is accommodated in the terminal accommodating groove, and the connecting body surface and the lower end surface of the shielding terminal are respectively aligned with the outer flange side and the lower end surface of the terminal block.

5. The terminal block shielding terminal elastic grounding structure according to claim 1, characterized in that: The positioning connection end of the shielding terminal is an L-shaped sheet whose length on one side along the depth direction of the accommodating slot is shorter than the length on the other side. The elastic contact portion is an elastic arm structure extending obliquely upward from the shorter side of the L-shaped sheet, and the free end of the elastic arm structure elastically presses against the lower end surface of the metal shell.

6. The terminal block shielding terminal elastic grounding structure according to claim 5, characterized in that: 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.

7. The terminal block shielding terminal elastic grounding structure according to claim 1 or 5, characterized in that: The positioning connection end of the shielding terminal is provided with an avoidance hole (25) directly opposite to the threaded hole of the connection nut, and the connection bolt can pass through the avoidance hole and be threadedly connected with the connection nut.

8. The terminal block shielding terminal elastic grounding 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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