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 socket. The structure comprises a component A, a component B, a screw, and a locking block. A screw hole extending longitudinally through the component B is provided in the component B. The screw is configured to extend through the screw hole, and a lower portion of a screw shank of the screw passes through the screw hole. The locking block is threadedly connected to the screw shank that passes through the screw hole and is eccentrically disposed thereon. A locking cavity is provided in the component A. An opening is provided on the top of the component A. A first limiting portion is disposed in the locking cavity. A second limiting portion is disposed in the locking cavity.When locking member A and member B, the locking block and the lower part of the screw rod pass through the opening and are inserted into the locking cavity. The screw is rotated to drive the locking block into eccentric rotation, and the locking block is made to abut against the first limiting part. The screw is then rotated to make the locking block rise and abut against the second limiting part. The invention has the following advantages: The structure can prevent the screw from falling during the opening of a case and a cover, thereby avoiding the problem of the screw being missing. In addition, the ease of connection and the tightness of the connection are improved. Figure for 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, to a screw locking structure and an electrical box equipped with such a structure. Background to the invention

[0002] It is well known that screws are widely used in various products to fix one component to another component. In the prior art, when detachably connecting a component A and a component B, the component B is generally fixed to the component A by means of a detachable screw. When the component B is to be detached, the screw is loosened to remove the component B from the component A. In the current structure, the screw immediately falls off the component B after it is detached. Therefore, the screw easily disappears, which prevents the further fixing of the component B.

[0003] To prevent the screw from falling out of the component B, after the screw is inserted into a through hole of the component B, a retaining ring is engaged on the screw using a special tool. The retaining ring is placed on an inner face of the component B. When tightening the screw, the outer threads of the screw are locked by the retaining ring to prevent the screw from falling out of the through hole of the component B. With this structure, the screw can be prevented from falling out. However, since the retaining ring engaged with the screw must be arranged on the inner face of the component B, the structure is complex and the mounting process is complicated. Summary

[0004] In the invention, in order to solve the technical problem in the prior art that a screw easily falls off and a screw mounting structure is excessively complex during the connection of a component A to a component B, a screw locking structure is provided. The screw locking structure has a simple and easy structure, prevents the screw from falling off, allows the component A and the component B to be easily detached, and improves the ease of disassembly / assembly.

[0005] The object of the invention is achieved by the following technical features:

[0006] A screw locking structure is provided. The structure comprises a component A, a component B, a screw and a locking block. A screw hole extending longitudinally through the component B is provided in the component. The screw is adapted to extend through the screw hole, and a lower portion of a shank of the screw passes through the screw hole. The locking block is connected threaded manner to the screw shank that passes through the screw hole and is eccentrically disposed thereon. A locking cavity is provided in component A. An opening in communication with the locking cavity and configured for 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 provided on one side of the locking cavity located in a horizontal direction of the opening. A second limiting portion configured to prevent the locking block from moving up / down is provided in a position of the locking cavity located above the first limiting portion. When locking component A and component B, the locking block and the screw shank pass through the opening and are inserted into the locking cavity.The screw is rotated to drive the locking block to rotate eccentrically toward one side of the opening, and the locking block is caused to abut against the first limiting portion. The screw is then rotated to raise the locking block and abut against the second limiting portion. In the structure, component A and component B are detachable. When locking, the screw and the locking block are inserted into the locking cavity through the opening, the screw is tightened to drive 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, and then the screw is further tightened.Since the horizontal direction of the locking block is limited to the first limiting part, the locking block continuously rises relative to the screw, until the locking block abuts against the second limiting part at the top of the locking cavity, so that the component A and the component B are stably fixed. In this way, the screw cannot fall off during the detachment of the component A and the component B, avoiding the problem of the screw being missing, and a large contact area is achieved between the locking block and the locking cavity, which improves the connection strength, the connection tightness and the overall disassembly / assembly convenience.

[0007] Preferably, the screw hole comprises a first stepped hole, a second stepped hole and a third stepped hole whose diameters 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, close to the screw head. When locking, the screw head abuts the first step, one end of the spring abuts the screw head and another end of the spring abuts the second step. An anti-detachment head with a width greater than the diameter of the screw shank is provided on a lower end of the screw shank. A smooth part of the shank is arranged between the anti-detachment head and the locking block. The first stage limits the screw head, which prevents overtightening of the screw, and the second stage limits the spring. In addition, by coupling the spring, the smooth part of the shank, and the anti-detachment head, the number of tightening turns of the screw can be reduced, so that the screw can be easily pushed outward under the action of the spring during unlocking. In addition, the anti-detachment head prevents the screw from separating from the locking block. This achieves 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 to the inside. 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 as to be able to be lifted into the coupling portion of the rod body. The external threads correspond to the opening of the female portion of the thread. Due to 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 move up / down without being detached from component B, thus avoiding losing the screw.

[0009] Preferably, at least one positioning engagement plate is provided on a lower portion of the member 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. When unlocking, the positioning engagement plate is engaged in the positioning engagement groove under the force of the spring. Due 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 a rotational position of the locking block from interfering with the opening, thereby avoiding the need to adjust the position of the locking block when the locking block is installed. Ease of assembly is thus improved.

[0010] Preferably, two positioning engagement plates are provided. The two positioning plates are arranged parallel and symmetrically on the member 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. By virtue of the two symmetrical structures, the positioning of the locking block can be better ensured, the positioning accuracy can be improved, and the grooves Locking block positioning engagement plates can be engaged accurately and quickly with the positioning engagement plates.

[0011] Preferably, a third limiting portion is provided on a side of the locking cavity opposite the first limiting portion. The third limiting portion and the first limiting portion are on the same plane. When unlocking, the locking block abuts the third limiting portion in the horizontal direction, and an upper portion of the locking block is located at the opening. When locking, the locking block abuts the first limiting portion in the horizontal direction, and the top of the locking block abuts 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 ensured 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 abuts 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 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 portion is an upper inner wall of the locking cavity, and the upper inner wall of the locking cavity is flat in shape. When unlocking, the eccentric engagement head is longitudinally aligned with the opening. When locking, the upper surface of the eccentric engagement head abuts against the upper inner wall of the locking cavity.Since the eccentric engagement head and the inner wall of the locking cavity have a flat shape, 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 strength of the connection between component A and component B. In addition, the eccentric engagement head can be coupled to the locking cavity more desirably. When the eccentric engagement head is located on the left side of the locking cavity, the eccentric engagement head is tightened, and when the eccentric engagement head is located on the right side of the locking cavity, the eccentric engagement head is loosened. In addition, one dimension of the eccentric engagement head is less than one dimension. of the opening, so that the eccentric engagement head can be removed through the opening 12 when the 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-detachment head is inserted into the screw positioning hole. The screw positioning hole can further limit the screw to ensure that the head and tail of the screw are on the same line, thereby preventing the position of the screw 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 rotation accuracy of the screw during locking or unlocking.

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

[0015] Based on the above, the invention has the following advantages: In the structure, component A and component B are detachable. During locking, the screw and the locking block are inserted into the locking cavity through the opening, the screw is tightened to drive the locking block to rotate, so that the locking block pivots away from the opening and abuts the first limiting portion in the locking cavity, and then the screw is further tightened. With the horizontal direction of the locking block limited to the first limiting portion, the locking block continuously rises relative to the screw, until the locking block abuts the second limiting portion at the top of the locking cavity, so that component A and component B are stably fixed.In this way, the screw cannot fall off during the detachment of component A and component B, avoiding the problem of missing the screw, and a large contact area is achieved between the locking block and the locking cavity, which improves the connection strength, the tightness 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 housing according to the invention.

[0018] [Fig.3] is a structural diagram of a cover 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-off head; 34. Smooth part of the rod; 4. Lock; 401. Positioning engagement groove; 41. Eccentric engagement head; 5. Spring. Detailed description

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

[0022] As shown in [Fig.l] 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 the component B20 is provided in the component. The screw 3 is configured to extend through the screw hole 21, and a lower portion of a screw rod 32 of the screw 3 passes through the screw hole 21. The locking block 4 is threadedly connected to the screw rod 32 passing through the screw hole 21 and eccentrically disposed thereon. A locking cavity 11 is provided in the member A10. An opening 12 in communication with the locking cavity 11 and configured for insertion of the locking block 4 is provided on the top of the component A10.A first limiting portion 111 configured to prevent the locking block 4 from rotating is provided 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 provided in a position above the first limiting portion 111. When locking the component A10 and the component B20, 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 rotated to drive an eccentric part of the locking block 4 to rotate toward a side opposite to the opening 12 (move away from the opening 12), and the eccentric part of the locking block 4 is caused to abut against the first part. limiting 111. The screw 3 is further turned to raise the eccentric portion of the locking block 4 until the eccentric portion abuts against the second limiting portion 112. A third limiting portion 113 is provided on a side of the locking cavity 11 opposite the first limiting portion 111. The third limiting portion 113 and the first limiting portion 111 are on a same plane. The third limiting portion 113 and the first limiting portion 111 are inner walls of the locking cavity 11. When unlocking, the locking block 4 abuts against the third limiting portion 113 in the horizontal direction, and a top of the locking block 4 is located at the opening 12.When locking, the locking block 4 abuts against the first limiting portion 111 in the horizontal direction, and the top of the locking block 4 abuts against the second limiting portion 112. 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 4.In this way, it is ensured 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 upward relative to the screw 3 until the eccentric portion of the locking block 4 abuts 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 downward relative to the screw 3, and the locking block 4 can be removed through the opening 12. In the structure, the component A10 and the component B20 are detachable.During locking, the screw 3 and the locking block 4 are inserted into the locking cavity 11 through the opening 12, the screw 3 is tightened to drive the locking block 4 to rotate, so that the locking block 4 rotates away from the opening 12 and abuts the first limiting portion 111 in the locking cavity 11, and then the screw 3 is tightened again. Since the horizontal direction of the locking block 4 is limited to the first limiting portion 111, the locking block 4 continuously rises relative to the screw 3, until the locking block 4 abuts the second limiting portion 112 on the top of the locking cavity 11, so that the component A10 and the component B20 are stably fixed.In this way, the screw 3 cannot fall off during the detachment of the component A10 and the component B20, avoiding the problem of the screw 3 being missing, and a large contact area is obtained between the locking block 4 and the locking cavity 11, which improves the connection strength and tightness of the connection between the component A10 and the component B20 and the overall convenience of disassembly / assembly.

[0023] As shown in [Fig.l] 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 on an upper end of the screw rod 32. When 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 rod 32 is provided on a lower end of the screw rod 32.A smooth portion of the rod 34 is arranged between the anti-detachment head 33 and the locking block 4. By means of the first step 214, the screw head 31 is limited, which prevents excessive tightening of the screw 3, and by means of the second step 215, the spring 5 can be limited. In addition, by means of the coupling of the spring 5, the smooth portion of the rod 34 and the anti-detachment head 33, the number of tightening turns of the screw 3 can be reduced, so that the screw 3 can be easily pushed outward under the action of the spring 5 during unlocking. In addition, the anti-detachment head 33 prevents the screw from separating from the locking block 4. In this way, unlocking is rapid. 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 to the inside. The opening of the threaded portion 217 is larger than the opening of the threaded portion 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 as to be able to be lifted in the coupling portion of the rod body 216. The external threads 322 correspond to the opening of the threaded portion 217. When locking, the threaded portion 217 extends into the locking cavity 11. The external threads 322 are arranged in the middle of the rod body 321, to ensure that the locking block 4 is in the locking cavity 11 when the screw 3 is inserted. In addition, the screw 3 can be tightened to drive the locking block 4 to rotate in the locking cavity 11, to effectively limit the locking block 4, so as to fix the component A10 and the component 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 avoids losing the screw 3.

[0024] As shown in [Fig.l] 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 of the locking cavity 11 is flat in shape. When unlocking, the eccentric engagement head 41 is longitudinally aligned with the opening 12. When locking, the upper surface of the eccentric engagement head 41 abuts against the upper inner wall of the locking cavity 11. Since the eccentric engagement head 41 and the inner wall of the locking cavity 11 are arranged in a flat shape, the eccentric engagement head and the locking cavity are in close contact, and a contact area between the eccentric engagement head and the locking cavity is increased, which can further improve the connection strength between the component A10 and the component B20. In addition, the eccentric engagement head 41 can be coupled to the locking cavity 11 in a more desirable manner.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, a dimension of the eccentric engagement head 41 is smaller than a 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.l] and [Fig.3], two positioning engagement plates 201 are symmetrically arranged on the lower part of the 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. When unlocking, the positioning engagement plates 201 are engaged in the positioning engagement grooves 401 under the force of the spring 5.By virtue of 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, which prevents a rotational position of the locking block 4 from interfering with the opening 12, thereby avoiding the need to adjust a position of the locking block 4 when the locking block 4 is put in place. In this way, the ease of assembly is improved. By virtue of the two symmetrical structures, the positioning of the locking block 4 can be better ensured, the positioning accuracy can be improved, and the positioning engagement grooves 401 of the locking block 4 can be accurately and quickly engaged with the positioning engagement plates 201.

[0026] As shown in [Fig.l], 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-detachment head 33 is inserted into the positioning hole of the screw 13. Through the positioning hole of the screw 13, the screw 3 can be further limited, ensuring that the head and tail of the screw 3 are on the same line, thereby preventing the position of the screw 3 from deviating during tightening or loosening. In this way, it can be ensured that the screw 3 effectively drives the locking block 4 to rotate and move, thereby improving the rotation accuracy of the screw 3 during locking or unlocking.

[0027] As shown in [Fig.l] to [Fig.3], during locking of the structure, the component B20 is aligned with the opening 12, the lower part of the screw 3 and the locking block 4 at the component B20 are inserted into the locking cavity 11 through the opening 12, the screw head 31 of the screw 3 is caused to slide downward to abut against the first step 214, and the screw 3 is turned clockwise. Since the screw 3 and the locking block 4 are not fixed, during 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 caused to abut against the first limiting portion 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 moved downward relative to the tightening of the screw 3, causing the top of the locking block 4 to abut against the second limiting portion 112 of the locking cavity 11 (the upper inner wall of the locking cavity 11). Finally, the screw is tightened to lock and fix the component A10 and the component B20. In addition, a friction force between the locking block 4 and the upper inner wall of the locking cavity 11 can be increased under the force of the spring 5, which further improves the strength and stability of the connection.

[0028] During unlocking of the structure, the screw 3 is turned counterclockwise, so that the screw 3 can drive the locking block 4 to rotate 180° toward the opening 12 (the right side), to make the locking block 4 abut against the second limiting portion 112 of the locking cavity 11 (a right side wall of the locking cavity 11). During loosening of the screw 3, the spring 5 exerts an upward force on the screw 3, which further facilitates loosening of the screw 3 and saves effort. Once the 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 the component B20 under the action of the spring 5, to position the locking block 4, thereby 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 . detachment between component A10 and component B20, and the locking block 4 can be easily inserted through the opening 12 upon engagement. Finally, the locking block 4 is detached upwards through the opening 12 to achieve the separation between component A10 and component B20. After component B20 is detached, the screw 3 and the locking block 4 are connected to component B20. Therefore, the screw 3 is not detached, thereby avoiding the loss of the screw 3. Second step

[0029] An electrical box (such as an electrical outlet, socket) 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. The component A10 is placed in the housing 1, and the component B20 is placed on the cover 2. The component A10 and the component B20 are arranged symmetrically with respect to a center. The housing 1 is fixedly connected to the cover 2 by means of locking and engagement between the component A10 and the component B20. The interlocking has the same use and technical effects as the screw locking structure.

[0030] Based on the above, the invention has the following advantages: In the structure, the component A10 and the component B20 are detachable. During locking, the screw 3 and the locking block 4 are inserted into the locking cavity 11 through the opening 12, the screw 3 is tightened to drive 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, and then the screw 3 is tightened again. With the horizontal direction of the locking block 4 limited by the first limiting portion 111, the locking block 4 continuously rises relative to the screw 3, until the locking block 4 abuts against the second limiting portion 112 at the top of the locking cavity 11, so that the component A10 and the component B20 are stably fixed.In this way, the screw 3 cannot fall off during the detachment of the component A10 and the component B20, avoiding the problem of the screw 3 being missing, and a large contact area is obtained between the locking block 4 and the locking cavity 11, which improves the connection strength and tightness of the connection between the component A10 and the component B20 and the overall convenience of disassembly / assembly.

[0031] Although the present disclosure is described above, the scope of protection of the present 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 the present disclosure. Such changes and modifications are within the scope of protection of the invention.

Claims

Claims

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 the component B (20) is provided in the component; the screw (3) is arranged to extend through the screw hole (21), a lower portion of a screw rod (32) of the screw (3) passes through the screw hole (21), the locking block (4) is threadedly connected to the screw rod (32) passing through the screw hole (21) and eccentrically arranged thereon, and a locking cavity (11) is provided in the member A (10);an opening (12) in communication with the locking cavity (11) and configured for insertion of the locking block (4) is provided on the top of the component A (10), a first limiting portion (111) configured to prevent the locking block (4) from rotating is provided 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 rising / falling is provided at a position in the locking cavity (11) located above the first limiting portion (111), during locking of the component A (10) and the component B (20), the locking block (4) and the lower portion of the screw rod (32) pass through the opening (12) and are inserted into the locking cavity (11);the screw (3) is rotated to drive an eccentric portion of the locking block (4) to rotate toward a side opposite to the opening (12), and the eccentric portion of the locking block (4) is caused to abut against the first limiting portion (111); and the screw (3) is further rotated to raise the locking block (4) until the eccentric portion of the locking block (4) abuts against the second limiting portion (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 the third stepped hole (213), and a spring (5) is sleeved on an upper end of the screw rod (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 rod (32) is provided on a lower end of the screw rod (32), and a smooth part of the rod (34) is provided between the anti-detachment head (33) and the locking block (4).

3. The locking structure according to claim 2, wherein the third stepped hole (213) comprises a rod body coupling portion (216) and a thread coupling portion (217) from outside to inside, an opening of the thread coupling portion (217) is larger than an opening of the rod body coupling portion (216), the threaded rod (32) comprises a rod body (321) and external threads (322) provided on an outer wall of the rod body (321), the rod body (321) is liftably connected in the rod body fixing portion (216), and the external threads (322) match the opening of the thread fixing portion (217).

4. A locking structure according to claim 2, wherein at least one positioning engagement plate (201) is provided on a lower portion of the 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 of the spring (5).

5. A locking structure according to claim 4, wherein two positioning engagement plates (201) are arranged, the two positioning engagement plates (201) are arranged symmetrically on the 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 to be aligned with the two positioning engagement grooves (401).

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

7. A locking structure according to claim 1 or 6, wherein an eccentric engagement head (41) is provided on one side of the locking block (4), an upper surface of the eccentric engagement head (41) is flat in shape, the second limiting portion (112) is an upper inner wall of the locking cavity (11), the upper inner wall of the locking cavity (11) is flat in shape, and during unlocking, the eccentric engagement head (41) is provided so as to be longitudinally aligned 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. A 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 box comprising a screw locking structure according to one of claims 1 to 8, the electrical box 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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