SCREW LOCKING STRUCTURE

Abstract

SCREW LOCKING STRUCTURE The invention relates to the field of mechanical locking technologies and provides a screw locking structure and a grip. The structure comprises a component A, a component B, a screw, and a locking block. A screw hole extending longitudinally through component B is located within component B. The screw is designed to extend through the screw hole, and a lower portion of a screw shank passes through the screw hole. The locking block is threaded to the screw shank that passes through the screw hole and is eccentrically positioned on it. A locking cavity is provided in component A. An opening is provided on the top of component A. A first limiting portion is disposed within the locking cavity. A second limiting portion is disposed within the locking cavity.During the locking of element A and element B, the locking block and the lower part of the screw shank pass through the opening and are inserted into the locking cavity. The screw is rotated to cause the locking block to rotate eccentrically, and the locking block is brought to abut against the first limiting portion. The screw is then rotated to raise the locking block and bring it to abut against the second limiting portion. The invention offers the following advantages: The structure can prevent the screw from falling out during the opening of a housing and cover, thus avoiding the problem of the screw being missing. In addition, the ease of connection and the sealing of the connection are improved. Figure for the abstract: Figure 1.

Description

Title of the invention: SCREW LOCKING STRUCTURE technical field

[0001] The invention relates to the field of mechanical locking technologies and, in particular, a screw locking structure and an electrical housing equipped with such a structure. Context of the invention

[0002] It is well known that screws are widely used in various products to fasten one component to another. In the prior art, when a component A and a component B are removably connected, component B is generally fastened to component A by means of a removable screw. When component B needs to be detached, the screw is loosened to remove component B from component A. In the current design, the screw falls immediately from component B after it has been detached. Consequently, the screw disappears easily, which prevents the subsequent fastening of component B.

[0003] To prevent the screw from falling out of component B, once the screw is inserted into a through hole in component B, a retaining ring is engaged on the screw using a special tool. The retaining ring is positioned on an inner face of component B. When the screw is tightened, the external threads of the screw are locked by the retaining ring to prevent the screw from falling out of the through hole in component B. Thanks to this design, the screw is prevented from falling out. However, since the retaining ring engaged with the screw must be located on the inner face of component B, the design is complex and the assembly process is complicated. Summary

[0004] In the invention, to solve the prior art technical problem, namely that a screw easily falls out and that a screw mounting structure is excessively complex during the connection of a component A to a component B, a screw locking structure is proposed. The screw locking structure has a simple and easy design, prevents the screw from falling out, allows for easy separation of components A and B, and improves the ease of disassembly / assembly.

[0005] The objective of the invention is achieved through the following technical features:

[0006] A screw locking structure is proposed. The structure comprises a component A, a component B, a screw, and a locking block. A screw hole extending longitudinally through component B is provided in the component. The screw is designed to extend through the screw hole, and a lower portion of a screw shank passes through the screw hole. The locking block is connected to A threaded section is attached to the screw shank, which passes through the screw hole and is positioned eccentrically on it. A locking cavity is provided in component A. An opening communicating with the locking cavity and configured for the insertion of the locking block is provided on the top of component A. A first limiting portion, configured to prevent the locking block from rotating, is located on one side of the locking cavity, positioned horizontally from the opening. A second limiting portion, configured to prevent the locking block from moving up or down, is located in a position within the locking cavity above the first limiting portion. When components A and B are locked together, the locking block and the screw shank pass through the opening and are inserted into the locking cavity.The screw is turned to rotate the locking block eccentrically towards one side of the opening, causing the locking block to abut against the first limiting element. The screw is then turned to raise the locking block and bring it abut against the second limiting element. In the structure, components A and B are detachable. During locking, the screw and locking block are inserted into the locking cavity through the opening. The screw is tightened to rotate the locking block, causing it to pivot away from the opening and abut against the first limiting element in the locking cavity. The screw is then tightened again.Since the horizontal direction of the locking block is limited to the first limiting part, the locking block rises continuously relative to the screw until it abuts against the second limiting part at the top of the locking cavity, thus stably fixing components A and B. In this way, the screw cannot fall out during the removal of components A and B, avoiding the problem of missing screws, and a large contact area is achieved between the locking block and the locking cavity, improving the connection strength, the sealing of the connection, and the overall ease of disassembly / assembly.

[0007] Preferably, the screw hole comprises a first stepped hole, a second stepped hole, and a third stepped hole, the diameters of which gradually decrease from top to bottom. A first step is formed between the first stepped hole and the second stepped hole. A second step is formed between the second stepped hole and the third stepped hole. A spring is inserted at the upper end of the screw shank, near the screw head. During locking, the screw head abuts against the first step, one end of the spring abuts against the screw head, and the other end of the spring abuts against the second step. An anti-loosening head, wider than the diameter of the screw shank, is disposed on The lower end of the screw shank is fitted with a smooth section between the anti-loosening head and the locking block. The first step limits the screw head, preventing overtightening, while the second step limits the spring tension. Furthermore, the coupling of the spring, the smooth section of the shank, and the anti-loosening head reduces the number of turns required to tighten the screw, allowing it to be easily pushed outward by the spring during unlocking. Additionally, the anti-loosening head prevents the screw from separating from the locking block, resulting in rapid unlocking.

[0008] Preferably, the third stepped hole comprises a coupling portion of the rod body and a coupling portion of the thread from the outside in. The opening of the threaded portion is larger than the opening of the threaded portion of the rod body. The threaded rod comprises a rod body and external threads arranged on an outer wall of the rod body. The rod body is connected so that it can be lifted into the coupling portion of the rod body. The external threads correspond to the opening of the female portion of the thread. By means of the engagement between the coupling portion of the rod body and the coupling portion of the thread, it is possible to ensure that the rod body can be raised / lowered without being detached from component B, thus preventing the screw from being lost.

[0009] Preferably, at least one positioning engagement plate is disposed on a lower portion of element B. The positioning engagement plate is located at the opening. A positioning engagement groove corresponding to the positioning engagement plate is provided on the upper portion of the locking block. During unlocking, the positioning engagement plate is engaged in the positioning engagement groove by the force of the spring. Thanks to the coupling between the positioning engagement plate and the positioning engagement groove, the locking block can be removed and inserted through the opening, which prevents any rotational position of the locking block from interfering with the opening, thus avoiding the need to adjust the position of the locking block when it is installed. Ease of assembly is thereby improved.

[0010] Preferably, two positioning engagement plates are provided. The two positioning plates are arranged parallel and symmetrically on element B. Two positioning grooves are provided. The two positioning engagement grooves are arranged parallel and symmetrically on the locking block. The two positioning engagement plates are arranged so as to be aligned with the two positioning engagement grooves. Thanks to the two symmetrical structures, the positioning of the locking block can be better ensured, the positioning accuracy can be improved, and the grooves The positioning engagement of the locking block can be engaged precisely and quickly with the positioning engagement plates.

[0011] Preferably, a third limiting portion is disposed on one side of the locking cavity opposite the first limiting portion. The third limiting portion and the first limiting portion are on the same plane. During unlocking, the locking block abuts against the third limiting portion in the horizontal direction, and an upper portion of the locking block is positioned at the level of the opening. During locking, the locking block abuts against the first limiting portion in the horizontal direction, and the top of the locking block abuts against the second limiting portion. The locking block 4 is rotated 180°, and it is possible to prevent the locking block 4 from rotating 360°, in order to limit the locking block.In this way, it is guaranteed that the locking block is limited to the first limiting part of the locking cavity when the screw is turned clockwise, so that the locking block can be moved upwards relative to the screw until the locking block butts against the second limiting part, and that the locking block is limited to the third limiting part of the locking cavity when the screw is turned counterclockwise, so that the locking block can be moved downwards relative to the screw, and that the locking block can be removed through the opening.

[0012] Preferably, an eccentric engagement head is disposed on one side of the locking block. The upper surface of the eccentric engagement head is flat. The second limiting part is an upper inner wall of the locking cavity, and the upper inner wall of the locking cavity is flat. During unlocking, the eccentric engagement head is aligned longitudinally with the opening. During locking, the upper surface of the eccentric engagement head abuts against the upper inner wall of the locking cavity.Because the eccentric engagement head and the inner wall of the locking cavity are flat, they are in close contact, increasing the contact area and further improving the strength of the connection between component A and component B. Additionally, the eccentric engagement head can be more effectively mated to the locking cavity. When the eccentric engagement head is located on the left side of the locking cavity, it is tightened, and when it is located on the right side, it is loosened. Furthermore, the eccentric engagement head is one dimension smaller than the other. of the opening, so that the eccentric engagement head can be removed through the opening 12 when component B is separated.

[0013] Preferably, a screw positioning hole aligned with the screw hole is provided at the bottom of the locking cavity. During locking, the anti-loosening head is inserted into the screw positioning hole. The screw positioning hole further restricts the screw to ensure that the head and shank of the screw are on the same line, thus preventing the screw position from deviating during tightening or loosening. In this way, it is possible to ensure that the screw effectively drives the locking block to rotate and move, thereby improving the rotational accuracy of the screw during locking or unlocking.

[0014] An electrical housing (or socket) is provided, which adopts the aforementioned screw-locking structure. The base comprises a housing and a cover. Component A is placed in the housing, component B is placed on the cover, and the housing is permanently connected to the cover by means of a locking and engagement between component A and component B.

[0015] Based on the foregoing, the invention has the following advantages: In the structure, component A and component B are detachable. During locking, the screw and locking block are inserted into the locking cavity through the opening. The screw is tightened to cause the locking block to rotate, so that the locking block pivots away from the opening and abuts against the first limiting portion in the locking cavity. The screw is then tightened again. Since the horizontal direction of the locking block is limited to the first limiting portion, the locking block rises continuously relative to the screw until it abuts against the second limiting portion at the top of the locking cavity, thus stably fixing component A and component B.In this way, the screw cannot fall out during the detachment of component A and component B, thus avoiding the problem of the screw being missing, and a large contact area is obtained between the locking block and the locking cavity, which improves the connection strength, the sealing of the connection and the overall convenience of disassembly / assembly. Brief description of the drawings

[0016] [Fig-1] is a structural diagram of a screw locking structure according to the invention.

[0017] [Fig.2] is a structural diagram of a dwelling according to the invention.

[0018] [Fig.3] is a structural diagram of a lid according to the invention.

[0019] [Fig.4] is a schematic structural diagram of an electrical box according to the invention.

[0020] 1. Housing; 10. Component A; 11. Locking cavity; 111. First part limiting; 112. Second limiting part; 113. Third limiting part; 12. Opening; 13. Screw positioning hole; 2. Cover; 20. Component B; 201. Positioning engagement plate; 21. Screw hole; 211. First stepped hole; 212. Second stepped hole; 213. Third stepped hole; 214. First step; 215. Second step; 216. Female part of the rod body; 217. Female part of the thread; 3. Screw; 31. Screw head; 32. Screw shank; 321. Rod body; 322. External thread; 33. Anti-disengagement head; 34. Smooth part of the rod; 4. Locking; 401. Positioning engagement groove; 41. Eccentric engagement head; 5. Spring. Detailed description

[0021] In order to make the aforementioned objectives, features, and advantages of the invention more apparent and understandable, specific embodiments of the invention are described in detail below, with reference to the drawings. First step

[0022] As shown in [Fig. 1] to [Fig. 3], a screw locking structure comprises a component A10, a component B20, a screw 3, and a locking block 4. A screw hole 21 extending longitudinally through component B20 is provided in the component. The screw 3 is designed to extend through the screw hole 21, and a lower portion of a screw shank 32 of the screw 3 passes through the screw hole 21. The locking block 4 is threaded to the screw shank 32 passing through the screw hole 21 and is eccentrically positioned on this shank. A locking cavity 11 is provided in component A10. An opening 12 communicating with the locking cavity 11 and configured for the insertion of the locking block 4 is provided on the top of component A10.A first limiting portion 111, configured to prevent the locking block 4 from rotating, is disposed on one side of the locking cavity 11 located in a horizontal direction of the opening 12. A second limiting portion 112, configured to prevent the locking block 4 from moving up / down, is disposed in a position above the first limiting portion 111. When the components A10 and B20 are locked, the locking block 4 and the lower part of the screw shank 32 pass through the opening 12 and are inserted into the locking cavity 11. The screw 3 is rotated to cause an eccentric part of the locking block 4 to rotate towards a side opposite the opening 12 (away from the opening 12), and the eccentric part of the locking block 4 is brought to abut against the first part. Limiting part 111. The screw 3 is further rotated to raise the eccentric portion of the locking block 4 until it abuts against the second limiting part 112. A third limiting part 113 is located on one side of the locking cavity 11 opposite the first limiting part 111. The third limiting part 113 and the first limiting part 111 are on the same plane. The third limiting part 113 and the first limiting part 111 form the inner walls of the locking cavity 11. During unlocking, the locking block 4 abuts against the third limiting part 113 in the horizontal direction, and one apex of the locking block 4 is positioned at the level of the opening 12.During locking, the locking block 4 comes to rest against the first portion of the limitation 111 in the horizontal direction, and the top of the locking block 4 comes to rest against the second portion of the limitation 112. The locking block 4 is rotated by 180°, and it is possible to prevent the locking block 4 from rotating by 360°, in order to limit the locking block 4.In this way, it is guaranteed that the locking block 4 is limited to the first limiting portion 111 of the locking cavity 11 when the screw 3 is turned clockwise, so that the locking block 4 can be moved upwards relative to the screw 3 until the eccentric portion of the locking block 4 comes to rest against the second limiting portion 112, and the locking block 4 is limited to the third limiting portion 113 of the locking cavity 11 when the screw is turned counterclockwise, so that the locking block can be moved downwards relative to the screw 3, and the locking block 4 can be removed through the opening 12. In the structure, component A10 and component B20 are detachable.During locking, screw 3 and locking block 4 are inserted into the locking cavity 11 through the opening 12. Screw 3 is tightened to rotate locking block 4, causing it to rotate away from the opening 12 and abut against the first limiting portion 111 in the locking cavity 11. Then, screw 3 is tightened again. Since the horizontal direction of locking block 4 is limited by the first limiting portion 111, locking block 4 continuously rises relative to screw 3 until it abuts against the second limiting portion 112 on top of the locking cavity 11, thus stably fixing components A10 and B20.In this way, screw 3 cannot fall out during the detachment of component A10 and component B20, thus avoiding the problem of missing screw 3, and a large contact area is obtained between the locking block 4 and the locking cavity 11, which improves the connection strength and sealing of the connection between component A10 and component B20 and the overall convenience of disassembly / assembly.

[0023] As shown in [Fig.1] to [Fig.3], the screw hole 21 comprises a first stepped hole 211, a second stepped hole 212 and a third stepped hole 213 whose diameters gradually decrease from top to bottom. A first step 214 is formed between the first stepped hole 211 and the second stepped hole 212. A second step 215 is formed between the second stepped hole 212 and the third stepped hole 213. A spring 5 is sleeved onto one upper end of the screw shank 32. During locking, one screw head 31 of the screw 3 abuts against the first step 214, one end of the spring 5 abuts against the screw head 31, and the other end of the spring 5 abuts against the second step 215. An anti-loosening head 33, wider than the diameter of the screw shank 32, is disposed on one lower end of the screw shank 32.A smooth portion of the rod 34 is positioned between the anti-loosening head 33 and the locking block 4. The first step 214 limits the screw head 31, preventing overtightening of the screw 3, and the second step 215 limits the spring 5. Furthermore, the coupling of the spring 5, the smooth portion of the rod 34, and the anti-loosening head 33 reduces the number of turns required to tighten the screw 3, allowing it to be easily pushed outward by the spring 5 during unlocking. Additionally, the anti-loosening head 33 prevents the screw from separating from the locking block 4, thus enabling rapid unlocking. The third stepped hole 213 comprises a coupling portion of the rod body 216 and a coupling portion of the thread 217, from the outside in. The opening of the threaded part 217 is larger than the opening of the threaded part 216 of the rod body.The threaded rod 32 comprises a rod body 321 and external threads 322 arranged on an outer wall of the rod body 321. The rod body 321 is connected so that it can be lifted into the coupling portion of the rod body 216. The external threads 322 correspond to the opening of the threaded portion 217. During locking, the threaded portion 217 extends into the locking cavity 11. The external threads 322 are located in the middle of the rod body 321 to ensure that the locking block 4 is positioned within the locking cavity 11 when the screw 3 is inserted. Furthermore, the screw 3 can be tightened to rotate the locking block 4 within the locking cavity 11, effectively securing the locking block 4 and thus fixing components A10 and B20.Thanks to the coupling part 216 of the rod body, the screw 3 can move up / down without being detached from the cover 2, which prevents the screw 3 from being lost.

[0024] As shown in [Fig. 1] to [Fig. 3], an eccentric engagement head 41 is disposed on one side of the locking block 4. The upper surface of the eccentric engagement head 41 is flat. The second limiting portion 112 is an upper inner wall of the locking cavity 11, and the upper inner wall The locking cavity 11 is flat. During unlocking, the eccentric engagement head 41 is aligned longitudinally with the opening 12. During locking, the upper surface of the eccentric engagement head 41 abuts against the upper inner wall of the locking cavity 11. Because the eccentric engagement head 41 and the inner wall of the locking cavity 11 are flat, the eccentric engagement head and the locking cavity are in close contact, and the contact area between the eccentric engagement head and the locking cavity is increased, which can further improve the connection strength between component A10 and component B20. Furthermore, the eccentric engagement head 41 can be more effectively coupled to the locking cavity 11.When the eccentric engagement head 41 is located on the left side of the locking cavity 11, the eccentric engagement head is tightened, and when the eccentric engagement head 41 is located on the right side of the locking cavity 11, the eccentric engagement head is loosened. Furthermore, one dimension of the eccentric engagement head 41 is smaller than one dimension of the opening 12, so that the eccentric engagement head 41 can be removed through the opening 12 when the cover 2 is separated.

[0025] As shown in [Fig. 1] and [Fig. 3], two positioning engagement plates 201 are arranged symmetrically on the lower part of component B20 in parallel, the positioning engagement plates 201 are arranged vertically, and the positioning engagement plates 201 are arranged so as to be aligned with the opening 12. Positioning engagement grooves 401 corresponding to the positioning engagement plates 201 are provided on an upper part of the eccentric engagement head 4L. During unlocking, the positioning engagement plates 201 are engaged in the positioning engagement grooves 401 under the force of the spring 5.Thanks to the coupling between the positioning engagement plates 201 and the positioning engagement grooves 401, the locking block 4 can be removed and inserted through the opening 12. This prevents the rotational position of the locking block 4 from interfering with the opening 12, thus eliminating the need to adjust the position of the locking block 4 when it is installed. In this way, ease of assembly is improved. The two symmetrical structures ensure better positioning of the locking block 4, improve positioning accuracy, and allow the positioning engagement grooves 401 of the locking block 4 to engage precisely and quickly with the positioning engagement plates 201.

[0026] As shown in [Fig. 1], a screw positioning hole 13 aligned with the screw hole 21 is provided on the bottom of the locking cavity 11 of the component A10. During locking, the anti-loosening head 33 is inserted into the positioning hole for screw 13. Thanks to this positioning hole, screw 3 is further restricted, ensuring that the head and shank of screw 3 are aligned, thus preventing screw 3 from deviating during tightening or loosening. This ensures that screw 3 effectively drives the locking block 4 to rotate and move, improving the rotational accuracy of screw 3 during locking or unlocking.

[0027] As shown in [Fig.1] to [Fig.3], during the locking of the structure, component B20 is aligned with the opening 12, the lower part of screw 3 and the locking block 4 at the level of component B20 are inserted into the locking cavity 11 through the opening 12, the screw head 31 of screw 3 is made to slide downwards to butt against the first step 214, and screw 3 is turned clockwise. Since the screw 3 and the locking block 4 are not fixed, during the tightening of the screw 3, the locking block 4 is first driven to rotate 180° from the opening 12 (a right side) to a left side, and the eccentric engagement head 41 on the locking block 4 is brought to abut against the first limiting part 111 of the locking cavity 11 (a left side wall of the locking cavity 11). The screw 3 is then tightened.Since the locking block 4 can no longer rotate with the screw 3, the locking block 4 is displaced downwards relative to the tightening of the screw 3, causing the top of the locking block 4 to abut against the second limiting part 112 of the locking cavity 11 (the upper inner wall of the locking cavity 11). Finally, the screw is tightened to lock and secure component A10 and component B20. Furthermore, the friction force between the locking block 4 and the upper inner wall of the locking cavity 11 can be increased by the force of the spring 5, further improving the strength and stability of the connection.

[0028] During the unlocking of the structure, screw 3 is turned counterclockwise, so that screw 3 can cause locking block 4 to rotate 180° towards the opening 12 (the right side), so that locking block 4 comes to rest against the second limiting part 112 of the locking cavity 11 (a right-hand side wall of the locking cavity 11). During the loosening of screw 3, spring 5 exerts an upward force on screw 3, which further facilitates loosening screw 3 and saves effort. Once screw 3 is loosened, the positioning engagement groove 401 of the locking block 4 can be easily engaged with the positioning engagement plate 201 of component B20 under the action of spring 5, to position the locking block 4, thus helping to align the locking block 4 with the opening 12.In this way, interference between the locking block 4 and the opening 12 is avoided during the . The separation between component A10 and component B20 occurs, and the locking block 4 can be easily inserted through the opening 12 during engagement. Finally, the locking block 4 is lifted upwards through the opening 12 to separate component A10 from component B20. Once component B20 is detached, screw 3 and the locking block 4 are connected to component B20. Therefore, screw 3 remains attached, preventing its loss. Second stage

[0029] An electrical housing (of the plug or socket type) is provided, which adopts the aforementioned screw-locking structure. The base comprises a housing 1, a cover 2, a component A10, and a component B20. Component A10 is placed inside the housing 1, and component B20 is placed on the cover 2. Component A10 and component B20 are arranged symmetrically about a center. The housing 1 is permanently connected to the cover 2 by means of a locking and engagement between component A10 and component B20. The interlocking mechanism has the same function and technical effects as the screw-locking structure.

[0030] Based on the foregoing, the invention has the following advantages: In the structure, component A10 and component B20 are detachable. During locking, screw 3 and locking block 4 are inserted into the locking cavity 11 through opening 12. Screw 3 is tightened to cause the locking block 4 to rotate, so that the locking block 4 rotates away from the opening 12 and abuts against the first limiting portion 111 in the locking cavity 11. Then, screw 3 is tightened again. Since the horizontal direction of the locking block 4 is limited by the first limiting portion 111, the locking block 4 rises continuously relative to screw 3 until it abuts against the second limiting portion 112 at the top of the locking cavity 11, thus stably fixing component A10 and component B20.In this way, screw 3 cannot fall out during the detachment of component A10 and component B20, thus avoiding the problem of missing screw 3, and a large contact area is obtained between the locking block 4 and the locking cavity 11, which improves the connection strength and sealing of the connection between component A10 and component B20 and the overall convenience of disassembly / assembly.

[0031] Although the present disclosure is described above, the scope of protection of this disclosure is not limited thereto. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of this disclosure. Such changes and modifications fall within the scope of the protection of the invention.

Claims

Demands

1. A screw locking structure, comprising a component A (10), a component B (20), a screw (3) and a locking block (4), wherein a screw hole (21) extending longitudinally through component B (20) is provided in the component; the screw (3) is disposed to extend through the screw hole (21), a lower portion of a screw shank (32) of the screw (3) passes through the screw hole (21), the locking block (4) is threaded to the screw shank (32) passing through the screw hole (21) and disposed eccentrically on it, and a locking cavity (11) is provided in element A (10);an opening (12) in communication with the locking cavity (11) and configured for the insertion of the locking block (4) is provided on the top of component A (10), a first limiting part (111) configured to prevent the locking block (4) from rotating is disposed on one side of the locking cavity (11) located in a horizontal direction of the opening (12), a second limiting part (112) configured to prevent the locking block (4) from moving up / down is disposed at a position in the locking cavity (11) located above the first limiting part (111), during the locking of component A (10) and component B (20), the locking block (4) and the lower part of the screw rod (32) pass through the opening (12) and are inserted into the locking cavity (11);the screw (3) is turned to cause an eccentric part of the locking block (4) to rotate towards a side opposite to the opening (12), and the eccentric part of the locking block (4) is brought to abut against the first limiting part (111); and the screw (3) is turned again to raise the locking block (4) until the eccentric part of the locking block (4) comes to abut against the second limiting part (112).

2. A locking structure according to claim 1, wherein the screw hole (21) comprises a first stepped hole (211), a second stepped hole (212), and a third stepped hole (213) whose diameters gradually decrease from top to bottom, a first step (214) is formed between the first stepped hole (211) and the second stepped hole (212), a second step (215) is formed between the second stepped hole (212) and third stepped hole (213), and a spring (5) is sleeved on an upper end of the screw shank (32); and during locking, a screw head (31) of the screw (3) abuts against the first step (214), one end of the spring (5) abuts against the screw head (31), and another end of the spring (5) abuts against the second step (215); an anti-detachment head (33) with a width greater than the diameter of the screw shank (32) is disposed on a lower end of the screw shank (32), and a smooth portion of the shank (34) is disposed between the anti-detachment head (33) and the locking block (4).

3. Locking structure according to claim 2, wherein the third stepped hole (213) comprises a coupling portion of the rod body (216) and a coupling portion of the thread (217) from the outside in, an opening of the thread coupling portion (217) is larger than an opening of the coupling portion of the rod body (216), the threaded rod (32) comprises a rod body (321) and external threads (322) disposed on an outer wall of the rod body (321), the rod body (321) is connected so as to be able to be lifted into the fixing portion of the rod body (216), and the external threads (322) correspond to the opening of the fixing portion of the thread (217).

4. Locking structure according to claim 2, wherein at least one positioning engagement plate (201) is disposed on a lower part of component B (20), the positioning engagement plate (201) is located at the opening (12), a positioning engagement groove (401) corresponding to the positioning engagement plate (201) is provided on a top of the locking block (4), and during unlocking, the positioning engagement plate (201) is engaged with the positioning engagement groove (401) under a force from the spring (5).

5. Locking structure according to claim 4, wherein two positioning engagement plates (201) are arranged, the two positioning engagement plates (201) are arranged symmetrically on component B (20) in parallel, two positioning engagement grooves (401) are provided, the two positioning engagement grooves (401) are arranged symmetrically on the locking block (4) in parallel, and the two positioning engagement plates (201) are arranged so as to be aligned with the two positioning engagement grooves (401).

6. Locking structure according to claim 1, wherein a third limiting part (113) is disposed on a side of the locking cavity (11) opposite the first limiting part (111); and during unlocking, the locking block (4) abuts against the third limiting part (113) in the horizontal direction, and a top of the locking block (4) is located at the level of the opening (12), and during locking, the locking block (4) abuts against the first limiting part (111) in the horizontal direction, and the top of the locking block (4) abuts against the second limiting part (112).

7. Locking structure according to claim 1 or 6, wherein an eccentric engagement head (41) is disposed on one side of the locking block (4), an upper surface of the eccentric engagement head (41) is flat, the second limiting part (112) is an upper inner wall of the locking cavity (11), the upper inner wall of the locking cavity (11) is flat, and during unlocking, the eccentric engagement head (41) is disposed so as to be aligned longitudinally with the opening (12); and during locking, the upper surface of the eccentric engagement head (41) abuts against the upper inner wall of the locking cavity (11).

8. Locking structure according to claim 2, wherein a screw positioning hole (13) aligned with the screw hole (21) is provided at the bottom of the locking cavity (11), and during locking, the anti-detachment head (33) is inserted into the screw positioning hole (13).

9. An electrical enclosure comprising a screw-locking structure according to any one of claims 1 to 8, the electrical enclosure comprising a housing (1) and a cover (2), wherein a component A (10) is disposed in the housing (1), a component B (20) is disposed on the cover (2), and the housing (1) is fixedly connected to the cover (2) by locking and coupling between component A (10) and component B (20).

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