Circuit board assembly with electrostatic protection function

Abstract

The invention relates to the technical field of circuit boards, and discloses a circuit board assembly with an electrostatic protection function, which is used for solving the problems that a circuit board is worn when a fixing bolt rotates and the fixing bolt falls off when the fixing bolt is unloaded. A protective sleeve is arranged in a mounting hole of a circuit board main body, an internal thread, a limiting ring and a fixing bolt are arranged in the protective sleeve, a threaded supporting sleeve is arranged on the fixing bolt, and the threaded supporting sleeve is in threaded connection with the protective sleeve; when the circuit board body is installed, the hexagonal head of the fixing bolt and the top end of the protective sleeve generate rotating friction, so that friction between the hexagonal head of the fixing bolt and the upper end face of the circuit board body is avoided, and an insulating material on the upper end face of the circuit board body is prevented from being damaged. Moreover, when the circuit board main body is unloaded, the fixing bolt and the threaded supporting sleeve rotate at the same time, at the moment, when the threaded supporting sleeve is limited by the limiting ring, it is indicated that disassembly is completed, and the fixing bolt cannot fall off from the circuit board main body, so that the fixing bolt is prevented from being lost.

Description

Technical Field

[0001] The present application relates to the technical field of circuit boards, and in particular to a circuit board assembly with an electrostatic protection function. Background Art

[0002] Circuit board is also called printed circuit board, PCB board, electronic board or circuit board. It is the support of electronic components and the carrier of electrical connection of electronic components. Because it is made by electronic printing, it is called "printed" circuit board.

[0003] When installing the circuit board, the fixing bolts are generally passed through the mounting holes of the circuit board and directly installed on the inner wall of the mechanical case through the fixing bolts. During the process of twisting the fixing bolts for installation, the hexagonal head of the fixing bolt will form rotational friction with the insulating material on the upper end face of the circuit board, thereby damaging the insulating material on the upper end face of the circuit board, increasing the risk of leakage and electric shock, and possibly causing electrical accidents; and, when repairing the mechanical circuit board, the fixing bolts on the circuit board are generally removed. When there are more other structures installed in the mechanical case, the unloaded fixing bolts are difficult to take out in time due to the obstruction of other structures, and the fixing bolts will fall off and be difficult to find in the mechanical case. When fixing the circuit board later, there will be problems with loose fixation due to the lack of fixing bolts. Summary of the invention

[0004] The present application proposes a circuit board assembly with an electrostatic protection function, which has the advantages of preventing the fixing bolts from wearing the circuit board and preventing the fixing bolts from being lost, and is used to solve the problem of the fixing bolts wearing the circuit board when rotating and the fixing bolts falling off when uninstalling.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a circuit board assembly with electrostatic protection function, comprising a circuit board body, an electrostatic elimination device and a plurality of electrical components, the circuit board body is provided with a plurality of mounting holes, a protective cover is fixedly installed in the mounting holes, the protective cover comprises: a lower shell body, comprising a lower plate and an insertion part, the inner wall of the lower shell body is provided with an internal thread; an upper shell body, comprising an upper plate and an insertion part, the insertion part of the upper shell body is movably sleeved on the outside of the insertion part of the lower shell body; a limiting ring is fixedly installed on the inner wall of the upper plate of the upper shell body; a fixing bolt is provided in the protective cover, the fixing bolt comprises a hexagonal head and a screw with an external thread, the screw of the fixing bolt is movably arranged in the center of the protective cover, a threaded support sleeve is fixedly provided on the screw in the protective cover, the outer wall of the threaded support sleeve is provided with an external thread, and the threaded support sleeve is threadedly connected to the lower shell body.

[0006] Furthermore, the lengths of the lower shell inserting portion and the upper shell inserting portion are smaller than the thickness of the circuit board body.

[0007] Furthermore, the pitch of the inner thread of the lower shell is the same as the pitch of the outer thread of the fixing bolt.

[0008] Furthermore, the outer wall of the lower shell insertion portion and the inner wall of the upper shell insertion portion may be provided with wedge blocks for use therewith, and when the upper shell is sleeved on the outer side of the lower shell, the wedge blocks prevent the lower shell and the upper shell from moving in a direction away from each other.

[0009] Furthermore, a lower limit elongated circular groove is symmetrically opened at the bottom end of the inner wall of the lower shell body, and the lower limit elongated circular groove is connected to the center of the lower shell body. A limit circle block I is movably provided in the lower limit elongated circular groove, and one side of the limit circle block I extends into the center of the lower shell body; a support spring is movably sleeved on the screw rod of the fixing bolt, and the support spring is located between the hexagonal head of the fixing bolt and the upper plate of the upper shell body. Furthermore, the lower shell is provided with: a connecting groove, which is symmetrically opened on the inner wall of the lower shell, and the bottom end is connected with the lower limit elongated circular groove; a connecting rod, which is movably arranged in the connecting groove, and the bottom end is fixedly installed at the center position of the limit circle block I. The upper shell is provided with: a cache groove, which is opened at the top of the upper shell and is directly below the support spring; a slip ring, which is slidably installed in the cache groove; an upper limit elongated circular groove, which is symmetrically opened at the top of the upper shell and is located on the outside of the cache groove, and a plurality of transmission teeth are equidistantly arranged on the side wall of one side; a limit circle block II, which is arranged in the upper limit elongated circular groove, and the center position of the bottom end is fixedly installed on the connecting rod, and the side of the limit circle block II close to the cache groove extends into the cache groove for supporting the slip ring, and the limit circle block II is a gear, and the limit circle block II is meshed with the transmission tooth; a toggle rod, which is fixedly installed at the top of the limit circle block II; a plurality of elastic support blocks, which are arranged in an array in the cache groove; a plurality of limit grooves are opened in a ring array on the outer wall of the threaded support sleeve.

[0010] Furthermore, the limiting circular block I, the connecting rod and the limiting circular block II are cylindrical, and the axes of the limiting circular block I, the connecting rod and the limiting circular block II are in the same direction.

[0011] Furthermore, the lower limit oblong groove, the connecting groove and the upper limit oblong groove are oblong grooves.

[0012] Furthermore, the diameter of the limiting circular block I is greater than the diameter of the limiting circular block II.

[0013] This application has the following beneficial effects:

[0014] 1. The present application provides a circuit board assembly with an electrostatic protection function, wherein a protective cover is provided in the mounting hole of the circuit board body, an inner wall of the protective cover is provided with an internal thread, a limiting ring is provided at the top end of the inner wall of the protective cover, a fixing bolt is provided in the protective cover, a threaded support sleeve is fixedly provided on the fixing bolt, and the threaded support sleeve is threadedly connected to the protective cover; when the circuit board body is installed and the fixing bolt is twisted, the hexagonal head of the fixing bolt will generate rotational friction with the top end of the protective cover, thereby avoiding friction between the hexagonal head of the fixing bolt and the upper end surface of the circuit board body, thereby avoiding damage to the insulating material on the upper end surface of the circuit board body; and, when the circuit board body is uninstalled, the fixing bolt and the threaded support sleeve rotate at the same time. At this time, when the threaded support sleeve is limited by the limiting ring, it indicates that the disassembly is completed, and the fixing bolt will not fall off from the circuit board body, thereby preventing the fixing bolt from being lost.

[0015] 2. The present application provides a circuit board assembly with an electrostatic protection function, which is provided with a lower limit elongated circular groove in the lower shell body, a limit circle block I is provided in the lower limit elongated circular groove, and a support spring is provided on the fixing bolt; when fixing the circuit board body, by twisting the fixing bolt and the threaded support sleeve, when the bottom end of the threaded support sleeve is against the limit circle block I, the threaded support sleeve cannot continue to move downward, indicating that the circuit board body has been fixed, the support spring has been compressed to a certain extent, and the elastic force of the support spring on the protective sleeve is within a limited range, preventing the fixing bolt from being fixed too tight, resulting in excessive elastic force of the support spring, and ultimately causing damage to the mounting hole of the circuit board body.

[0016] 3. The present application provides a circuit board assembly with an electrostatic protection function, wherein a connecting rod is provided in the lower shell body, a slip ring and an elastic support block are provided in the buffer groove of the upper shell body, a limit circle block II, a transmission tooth and a toggle rod are provided in the upper limit elongated circular groove of the upper shell body, the limit circle block II is a gear, the transmission tooth and the limit circle block II are meshed, the limit circle block I, the connecting rod, the limit circle block II and the toggle rod are fixedly connected in sequence, and a limiting groove is provided in an annular array on the threaded support sleeve; when it is necessary to adjust the distance between the circuit board body and the box body, the limit circle block II and the limit circle block I are rotated by rotating the toggle rod, so that the limit circle block I and the limit circle block II are moved away from the axis of the protective sleeve. , release the limit of the threaded support sleeve by the limit circle I, and continue to twist the fixing bolt to make the threaded support sleeve continue to move downward, and the downwardly moved threaded support sleeve abuts against the inner wall of the box, thereby adjusting the distance between the circuit board body and the inner wall of the box, and preventing the box and the circuit board body from being too close to affect the heat dissipation of the circuit board body; and, after the adjustment is completed, pull back the toggle rod to move the limit circle II and the limit circle I in the direction close to the axis of the protective sleeve, so that the limit circle I enters the limiting groove and limits the rotation of the threaded support sleeve, thereby preventing the fixing bolt from rotating when the box vibrates, causing the circuit board body to become loose. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute a part of the specification, illustrate the embodiments disclosed in the present application and, together with the description, serve to explain the principles disclosed in the present application.

[0018] The present application can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 It is a cross-sectional view of the present invention from the axis of the mounting hole;

[0021] Figure 3 It is a schematic diagram of the structure of the protective cover and the fixing bolt of the present invention;

[0022] Figure 4 is a cross-sectional view of the protective cover and the fixing bolt of the present invention;

[0023] Figure 5 is a cross-sectional view of the lower housing of the present invention;

[0024] Figure 6 is a cross-sectional view of the upper housing of the present invention;

[0025] Figure 7 It is a schematic structural diagram of the fixing bolt of the present invention.

[0026] In the figure: 1. circuit board body; 101. mounting hole; 2. protective cover; 201. lower shell; 202. upper shell; 203. limiting ring; 204. lower limiting long circular groove; 205. limiting circular block I; 206. connecting groove; 207. connecting rod; 208. buffer groove; 209. slip ring; 210. upper limiting long circular groove; 211. limiting circular block II; 212. toggle rod; 213. elastic support block; 214. transmission tooth; 3. fixing bolt; 301. threaded support sleeve; 302. limiting groove; 4. support spring. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] Embodiment 1

[0029] See also Figure 1 and Figure 2A circuit board assembly with electrostatic protection function includes a circuit board body 1, on which a plurality of mounting holes 101 penetrating the circuit board body 1 are arranged in an array, and on which a static elimination device and a plurality of electrical components are fixedly mounted.

[0030] See also Figure 2-Figure 6 A protective cover 2 is fixedly installed in the mounting hole 101 of the circuit board body 1. The protective cover 2 includes a lower shell 201 and an upper shell 202. The lower shell 201 includes a lower plate and an insertion portion, and the upper shell 202 includes an upper plate and an insertion portion. The insertion portion of the upper shell 202 is movably sleeved on the outside of the insertion portion of the lower shell 201. An annular limiting ring 203 is fixedly installed on the inner wall of the upper plate of the upper shell 202, and an inner thread is provided on the inner wall of the lower shell 201; the fixing bolt 3 includes a hexagonal head and a screw with an external thread, and the screw of the fixing bolt 3 is movably arranged at the center of the protective cover 2, and a threaded support sleeve 301 is fixedly sleeved on the screw in the protective cover 2, and an outer wall of the threaded support sleeve 301 is provided with an external thread, and the threaded support sleeve 301 is threadedly connected with the lower shell 201.

[0031] The outer wall of the insertion part of the lower shell 201 and the inner wall of the insertion part of the upper shell 202 can be provided with wedge blocks for use together. When the upper shell 202 is sleeved on the outside of the lower shell 201, the wedge blocks prevent the lower shell 201 and the upper shell 202 from moving in a direction away from each other, so that the lower plate of the lower shell 201 and the upper plate of the upper shell 202 are tightly fitted to the end surface of the circuit board body 1.

[0032] The length of the insertion part of the lower shell 201 and the insertion part of the upper shell 202 is less than the thickness of the circuit board body 1. This prevents the insertion part of the lower shell 201 and the insertion part of the upper shell 202 from being too long, which causes the lower plate of the lower shell 201 and the upper plate of the upper shell 202 to fail to fit tightly against the end surface of the circuit board body 1, thereby affecting the effect of the fixing bolts 3 fixing the circuit board body 1.

[0033] The pitch of the internal thread of the lower housing 201 is the same as the pitch of the external thread of the fixing bolt 3. When the external thread of the fixing bolt 3 is screwed into the box, the length of the fixing bolt 3 screwed into the box is ensured to be the same as the length of the fixing bolt 3 extending from the protective cover 2.

[0034] The working principle of the first embodiment of the present invention is as follows:

[0035] See also Figure 1-Figure 6 In the process of installing the circuit board body 1 to the inner wall of the box, the fixing bolt 3 is twisted so that the outer thread of the screw rod of the fixing bolt 3 enters the inner wall of the box. When the fixing is about to be completed, the hexagonal head of the fixing bolt 3 will be in close contact with the upper end surface of the upper plate of the upper shell 202, and generate rotational friction with the upper end surface of the upper plate of the upper shell 202, so as to avoid the friction between the hexagonal head of the fixing bolt 3 and the upper end surface of the circuit board body 1, thereby preventing the insulating material on the upper end surface of the circuit board body 1 from being damaged;

[0036] When the circuit board body 1 needs to be repaired or maintained, the circuit board body 1 needs to be removed. At this time, the fixing bolt 3 is twisted in the opposite direction to twist the outer thread of the screw rod of the fixing bolt 3 out of the inner wall of the box. During this process, the fixing bolt 3 and the threaded support sleeve 301 rotate synchronously. After the outer thread of the screw rod of the fixing bolt 3 is twisted out of the inner wall of the box, the top of the threaded support sleeve 301 will support the limiting ring 203. The limiting ring 203 limits the threaded support sleeve 301. The threaded support sleeve 301 and the fixing bolt 3 can no longer be rotated, indicating that the disassembly is completed, and the fixing bolt 3 will not fall off from the circuit board body 1, thereby preventing the fixing bolt 3 from being lost, and avoiding the phenomenon that the fixing bolt 3 is lost and the fixing effect of the circuit board body 1 is poor.

[0037] Embodiment 2

[0038] When the fixing bolt 3 is used to fix the circuit board body 1, the hexagonal head of the fixing bolt 3 will be closely attached to the upper end surface of the circuit board body 1, and the circuit board body 1 is fixed by the extrusion force between the hexagonal head of the fixing bolt 3 and the inner wall of the box. In the process of twisting the fixing bolt 3 to fix, the force on the fixing bolt 3 is judged by the workers' experience. However, since the force is difficult to accurately control, the extrusion force between the hexagonal head of the fixing bolt 3 and the inner wall of the box will be too large, resulting in damage to the mounting hole 101 of the circuit board body 1. In view of the above phenomenon, the second embodiment is a further improvement on the basis of the first embodiment.

[0039] The difference from the first embodiment is that, please refer to Figure 3-Figure 6 A lower limit long circular groove 204 is symmetrically opened at the bottom end of the inner wall of the lower shell 201, and the lower limit long circular groove 204 is connected to the center of the lower shell 201. A limit round block I 205 is movably provided in the lower limit long circular groove 204, and one side of the limit round block I 205 extends into the center of the lower shell 201; a support spring 4 is movably sleeved on the screw rod of the fixing bolt 3, and the support spring 4 is located between the hexagonal head of the fixing bolt 3 and the upper plate of the upper shell 202.

[0040] The working principle of the second embodiment of the present invention is as follows:

[0041] See also Figure 1-Figure 6When the circuit board body 1 is installed on the inner wall of the box, the fixing bolt 3 is twisted to make the outer thread of the screw rod of the fixing bolt 3 enter the inner wall of the box. In this process, the threaded support sleeve 301 of the fixing bolt 3 moves in the same direction as the fixing bolt 3. At this time, the threaded support sleeve 301 rotates in the internal thread of the lower shell 201 and moves downward until the bottom end of the threaded support sleeve 301 abuts against the upper end of the limiting round block Ⅰ205 extending out of the center of the lower shell 201, thereby limiting the threaded support sleeve 301, and the fixing bolt 3 cannot continue to rotate. At this time, it indicates that the circuit board body 1 has been fixed, the supporting spring 4 has been compressed to a certain extent, and the elastic force of the supporting spring 4 on the protective cover 2 and the circuit board body 1 is within a limited range, preventing the fixing bolt 3 from being fixed too tight, resulting in excessive elastic force of the supporting spring 4, and ultimately causing damage to the mounting hole 101 of the circuit board body 1.

[0042] Embodiment 3

[0043] When the circuit board body 1 is fixed to the inner wall of the box, the box may be deformed to a certain extent due to various reasons during use. When the box is concave, the inner wall of the box may be close to the circuit board body 1, affecting the heat dissipation of the circuit board body 1. In view of the above phenomenon, embodiment 3 is a further improvement on embodiment 2.

[0044] The difference from the second embodiment is that please refer to Figure 3-Figure 7 , connecting grooves 206 are symmetrically provided on the inner wall of the lower shell 201, the bottom end of the connecting groove 206 is connected to the lower limit long circular groove 204, a connecting rod 207 is movably provided in the connecting groove 206, and the bottom end of the connecting rod 207 is fixedly installed at the center position of the limit round block I 205; an annular buffer groove 208 is provided at the top of the upper shell 202 and directly below the support spring 4, a slip ring 209 is slidably installed in the buffer groove 208, an upper limit long circular groove 210 is symmetrically provided at the top of the upper shell 202 and on the outside of the buffer groove 208, the bottom end of the upper limit long circular groove 210 is connected to the connecting groove 206 of the upper shell 202, a limit round block II 211 is provided in the upper limit long circular groove 210, and the center of the bottom end of the limit round block II 211 The center position is fixedly installed on the connecting rod 207, and the side of the limiting circle block II 211 close to the buffer groove 208 extends into the buffer groove 208 to support the slip ring 209. The top of the limiting circle block II 211 is fixedly installed with a toggle rod 212 extending out of the upper limit elongated circular groove 210. The limiting circle block II 211 is a gear. A plurality of transmission teeth 214 are equidistantly arranged on the side wall of one side of the upper limit elongated circular groove 210. The transmission teeth 214 are meshed with the limiting circle block II 211. A plurality of elastic support blocks 213 are arranged in an array in the buffer groove 208. The elastic support blocks 213 are used to support the reset of the slip ring 209 and will not hinder the limiting circle block II 211 from moving into the buffer groove 208. A plurality of limiting grooves 302 are arranged in an annular array on the outer wall of the threaded support sleeve 301.

[0045] The connecting rod 207 and the limiting circular block II 211 are cylindrical, the axes of the limiting circular block I 205, the connecting rod 207 and the limiting circular block II 211 are in the same upward direction, and the lower limiting long circular groove 204, the connecting groove 206 and the upper limiting long circular groove 210 are long circular grooves. It is ensured that the limiting circular block I 205, the connecting rod 207 and the limiting circular block II 211 can rotate simultaneously without being blocked.

[0046] The diameter of the limiting circular block I 205 is greater than the diameter of the limiting circular block II 211. When the slip ring 209 slides into the buffer groove 208 and the slip ring 209 blocks the limiting circular block II 211 from moving toward the buffer groove 208, the moving distance of the limiting circular block II 211 in the upper limit long circular groove 210 is enough to allow the edge of the limiting circular block I 205 to enter the limiting groove 302 of the threaded support sleeve 301, thereby limiting the rotation of the threaded support sleeve 301.

[0047] The working principle of the third embodiment of the present invention is as follows:

[0048] See also Figure 1-Figure 7 After fixing the circuit board body 1 with the fixing bolts 3, when it is necessary to adjust the distance between the circuit board body 1 and the box body, the toggle rods 212 on both sides are toggled to make the toggle rods 212 drive the limiting round block II 211 and the limiting round block I 205 to rotate. Since the limiting round block II 211 is engaged with the transmission tooth 214, while the limiting round block II 211 rotates, the limiting round block II 211, the connecting rod 207 and the limiting round block I 205 move in a direction away from the axis of the protective sleeve 2, thereby releasing the limiting round block I 205 on the threaded support sleeve 301 and the limiting round block II 211 on the slip ring 209. At this time, continue to twist the fixing bolts 3 to make the threaded support sleeve 301 be fixed to the sliding ring 209. The threaded support sleeve 301 continues to move downward, and the downwardly moved threaded support sleeve 301 abuts against the inner wall of the box, thereby adjusting the distance between the circuit board body 1 and the inner wall of the box, preventing the box and the circuit board body 1 from being too close to affect the heat dissipation of the circuit board body 1; and, as the threaded support sleeve 301 moves toward the inner wall of the box, the support spring 4 is also continuously squeezed, so that the support spring 4 exerts an increased pressure on the slip ring 209, causing the slip ring 209 to squeeze the elastic support block 213 to move into the buffer slot 208, reducing the elastic force of the support spring 4 on the protective sleeve 2, thereby reducing the pressure on the mounting hole 101 of the circuit board body 1, and preventing the mounting hole 101 from being damaged by excessive pressure;

[0049] After the adjustment is completed, by pulling back the toggle rod 212, the limiting circle block II 211 and the limiting circle block I 205 are moved away from the axis of the protective sleeve 2, and the limiting circle block I 205 enters the limiting groove 302 of the threaded support sleeve 301, so that the limiting circle block I 205 can limit the rotation of the threaded support sleeve 301 to prevent the fixing bolt 3 from rotating when the box vibrates, causing the circuit board main body 1 to become loose.

Claims

1. A circuit board assembly with electrostatic protection function, comprising a circuit board body (1), an electrostatic eliminator and a plurality of electrical components, wherein the circuit board body (1) is provided with a plurality of mounting holes (101), characterized in that: A protective cover (2) is fixedly installed in the installation hole (101), and the protective cover (2) comprises: A lower shell (201) comprises a lower plate and an inserting portion, and an inner wall of the lower shell (201) is provided with an internal thread; An upper shell (202) comprises an upper plate and an insertion portion, wherein the insertion portion of the upper shell (202) is movably sleeved on the outer side of the insertion portion of the lower shell (201); A limiting ring (203) is fixedly mounted on the inner wall of the upper plate of the upper shell (202); A fixing bolt (3) is arranged inside the protective sleeve (2), and the fixing bolt (3) comprises a hexagonal head and a screw with an external thread. The screw of the fixing bolt (3) is movably arranged at the center of the protective sleeve (2). A threaded support sleeve (301) is fixedly arranged on the screw inside the protective sleeve (2). The outer wall of the threaded support sleeve (301) is provided with an external thread. The threaded support sleeve (301) is threadedly connected to the lower shell (201).

2. The circuit board assembly with electrostatic protection function according to claim 1, characterized in that: The lengths of the lower shell (201) insertion portion and the upper shell (202) insertion portion are smaller than the thickness of the circuit board body (1).

3. The circuit board assembly with electrostatic protection function according to claim 1, characterized in that: The pitch of the internal thread of the lower housing (201) is the same as the pitch of the external thread of the fixing bolt (3).

4. The circuit board assembly with electrostatic protection function according to claim 1, characterized in that: The outer wall of the insertion portion of the lower shell (201) and the inner wall of the insertion portion of the upper shell (202) may be provided with a wedge block for use therewith, and when the upper shell (202) is sleeved on the outer side of the lower shell (201), the wedge block prevents the lower shell (201) and the upper shell (202) from moving in a direction away from each other.

5. The circuit board assembly with electrostatic protection function according to claim 1, characterized in that: A lower limiting long circular groove (204) is symmetrically provided at the bottom end of the inner wall of the lower shell (201), the lower limiting long circular groove (204) is connected to the center of the lower shell (201), a limiting circular block I (205) is movably provided in the lower limiting long circular groove (204), and one side of the limiting circular block I (205) extends into the center of the lower shell (201); A support spring (4) is provided on the movable sleeve of the screw rod of the fixing bolt (3), and the support spring (4) is located between the hexagonal head of the fixing bolt (3) and the upper plate of the upper shell (202).

6. The circuit board assembly with electrostatic protection function according to claim 5, characterized in that: The lower housing (201) is provided with: The connecting groove (206) is symmetrically arranged on the inner wall of the lower shell (201), and the bottom end is connected to the lower limit oblong groove (204); The connecting rod (207) is movably arranged in the connecting groove (206), and the bottom end is fixedly installed at the center position of the limiting circular block I (205). The upper housing (202) is provided with: A buffer slot (208) is provided at the top of the upper housing (202) and is located directly below the support spring (4); A slip ring (209) is slidably mounted in the buffer groove (208); An upper limit elongated circular groove (210) is symmetrically arranged at the top of the upper shell (202) and is located outside the buffer groove (208), and a plurality of transmission teeth (214) are equidistantly arranged on the side wall of one side; A limiting circular block II (211) is arranged in the upper limit long circular groove (210), and the center position of the bottom end is fixedly installed on the connecting rod (207), and the side of the limiting circular block II (211) close to the buffer groove (208) extends into the buffer groove (208) for supporting the slip ring (209), and the limiting circular block II (211) is a gear, and the limiting circular block II (211) is meshed with the transmission tooth (214); A toggle rod (212) is fixedly mounted on the top of the limiting circular block II (211); A plurality of elastic support blocks (213) are arranged in an array in the buffer slot (208); The outer wall of the threaded support sleeve (301) is provided with a plurality of limiting grooves (302) in an annular array.

7. The circuit board assembly with electrostatic protection function according to claim 6, characterized in that: The connecting rod (207) and the limiting circular block II (211) are cylindrical, and the axes of the limiting circular block I (205), the connecting rod (207) and the limiting circular block II (211) are in the same direction.

8. The circuit board assembly with electrostatic protection function according to claim 6, characterized in that: The lower limit oblong groove (204), the connecting groove (206) and the upper limit oblong groove (210) are oblong grooves.

9. The circuit board assembly with electrostatic protection function according to claim 6, characterized in that: The diameter of the limiting circular block I (205) is greater than the diameter of the limiting circular block II (211).

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