CN219196987U

CN219196987U - Spring bolt device

Info

Publication number: CN219196987U
Application number: CN202223370009.0U
Authority: CN
Inventors: 徐尚祥; 杨小云; 高倩; 雷晓东
Original assignee: Shenzhen Zhaowei Machinery and Electronics Co Ltd
Current assignee: Shenzhen Zhaowei Machinery and Electronics Co Ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-06-16
Anticipated expiration: 2032-12-14

Abstract

The utility model belongs to the technical field of limiting mechanical locks, and particularly relates to a lock tongue device. The spring bolt device comprises a shell, a driving mechanism, a screw rod, a spring bolt structure and a guiding structure. The casing is used for providing the assembly carrier for other spare part, and actuating mechanism is used for providing power, and the screw rod is equipped with the bull screw thread for with spring bolt structure cooperation, and guide structure and direction cooperation portion cooperation make the screw rod drive spring bolt structure along the axis reciprocating motion of screw rod, in order to realize the extension and the withdrawal function of spring bolt structure. According to the spring bolt device provided by the utility model, in the process that the screw rod drives the spring bolt structure to linearly move, the screw rod with multiple threads is matched with the threaded hole of the spring bolt structure, so that the phenomenon of pause caused by an assembly gap can be effectively eliminated, the spring bolt structure can more smoothly perform reciprocating linear movement, noise is effectively reduced or even eliminated, and the use experience of a user is greatly improved.

Description

Spring bolt device

Technical Field

The utility model belongs to the technical field of limiting mechanical locks, and particularly relates to a lock tongue device.

Background

At present, some electric equipment is provided with a lock tongue device, particularly a reversible screen, and the screen can be stably kept at the storage position by locking the screen which is turned to the storage position through the lock tongue extending out of the lock tongue device. In addition, the prior bolt device is generally driven by a motor, and adopts a gear-rack meshing transmission mode or a parallel gear meshing transmission mode. Because the gear teeth are meshed with each other with gaps (namely, the gear is meshed with the rack or the gear is meshed with the rack), the gear teeth are meshed with each other to be driven, and a phenomenon of pause exists in the process of transmission, so that noise is easy to generate, and the transmission process is not smooth.

Disclosure of Invention

The utility model aims to provide a spring bolt device, which aims to solve the problems that noise is easy to generate and the transmission process is not smooth because of the phenomenon of pause in the process of meshing transmission among gear teeth of the existing spring bolt device.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a deadbolt assembly comprising:

the shell is provided with an installation cavity and an opening communicated with the installation cavity;

the driving mechanism is arranged in the mounting cavity and comprises a power output structure;

the screw is rotatably arranged in the shell and positioned in the mounting cavity, one end of the screw is in transmission connection with the power output structure, and the screw is provided with multiple threads;

the bolt structure is positioned in the mounting cavity, the bolt structure is provided with a threaded hole, a guide matching part and a bolt head, the screw rod penetrates through the threaded hole and is in threaded fit with the thread of the threaded hole in a threaded fit manner, and the bolt head and the opening are opposite to each other;

the guide structure is arranged in the mounting cavity, and the guide structure is matched with the guide matching part, so that the multi-head screw thread drives the bolt structure to reciprocate along the axis of the screw rod, and the bolt head extends out of the opening or retracts into the mounting cavity.

In an embodiment, the latch bolt device further includes a sensing module and a sensed member, the sensed member is fixedly mounted in the latch bolt structure, the sensing module is mounted in the mounting cavity, the sensing module is electrically connected with the driving mechanism, the sensing module includes a first sensing portion and a second sensing portion, an extending direction of a connecting line of the first sensing portion and the second sensing portion is parallel to an axis of the screw rod, and the first sensing portion and the second sensing portion are respectively used for sensing a position of the sensed member when the latch bolt head extends out of the opening or retracts to the mounting cavity.

In one embodiment, the sensed member is a magnet, and the first sensing portion and the second sensing portion are hall sensors.

In one embodiment, the latch bolt structure includes a first member and a second member, the threaded hole is formed in the first member, the second member is an injection molded member and surrounds the first member, and the second member is formed with a latch bolt in an extending manner.

In one embodiment, the first member is provided with a restraining post which is embedded in the second member.

In one embodiment, the tongue structure further comprises a tongue sleeve, the tongue sleeve being wrapped around and secured to an end of the tongue.

In one embodiment, the driving mechanism further comprises a motor and a worm, the worm is fixedly mounted on a rotating shaft of the motor, the power output structure comprises an input gear and an output gear, the input gear is rotatably mounted on the shell, the output gear is fixedly mounted on the end portion of the screw, the input gear is assembled with the output gear in a transmission mode, the input gear is meshed with the worm, and gear teeth of the input gear are helical teeth.

In one embodiment, the number of helical teeth of the worm is multiple.

In one embodiment, a flat structure is arranged at the end part of the screw penetrating through the input gear, an operation through hole is arranged on the side wall of the shell, which is opposite to the flat structure, and the operation through hole is used for extending into the manual tool to be matched with the flat structure so as to manually drive the screw to rotate.

In one embodiment, the guiding structure comprises a guiding rod, the guiding matching part comprises a guiding hole formed in the first component, the guiding rod is fixedly arranged on the shell and penetrates through the guiding hole, and the axis of the guiding rod is parallel to the axis of the screw rod; and/or the guide structure comprises a guide groove arranged on the cavity wall of the mounting cavity, the extending direction of the guide groove is parallel to the axis of the screw rod, the guide matching part comprises a lug arranged on the second component, and the lug is inserted into the guide groove.

The utility model has at least the following beneficial effects:

by applying the bolt device provided by the utility model, the power output structure of the driving mechanism drives the screw rod to rotate, the screw rod drives the bolt structure matched with the multi-head threads to move, and the bolt structure moves linearly and reciprocally along the axis of the screw rod under the guiding and matching action of the guiding structure and the guiding and matching part, so that the bolt head extends out of the opening or retracts into the mounting cavity, the bolt head extends out of the opening to be in a working state of the bolt device, and correspondingly, the bolt head retracts into the mounting cavity to be in a to-be-working state of the bolt device. Because the multi-head screw thread and the threaded hole matched with the multi-head screw thread are adopted between the screw rod and the lock tongue structure to drive the lock tongue structure to reciprocate in the linear movement process, the cooperation between the multi-head screw thread and the threaded hole can effectively eliminate the pause phenomenon caused by the assembly clearance, so that the lock tongue structure can more smoothly perform linear movement, noise is effectively reduced and even eliminated, and the use experience of a user is greatly improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an assembled latch bolt assembly according to an embodiment of the present utility model;

FIG. 2 is a schematic view of an exploded view of a latch bolt assembly according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram showing an exploded view of a latch device according to an embodiment of the present utility model;

FIG. 4 is a schematic view of an exploded view of a latch bolt assembly according to an embodiment of the present utility model;

FIG. 5 is an enlarged view of FIG. 4 at A;

fig. 6 is a schematic diagram showing an exploded structure of a latch bolt structure and a sensed member in the latch bolt device according to the embodiment of the present utility model.

Wherein, each reference sign in the figure:

10. a housing; 101. a cover; 102. a main housing; 11. a mounting cavity; 111. a first compartment; 112. a second compartment; 12. an opening; 13. an operation through hole;

20. a driving mechanism; 21. a motor; 22. a worm; 210. a power take-off structure; 211. an input gear; 212. an output gear;

30. a screw; 31. a multi-start thread; 32. a flat structure;

40. a tongue structure; 41. a threaded hole; 42. a guide fitting portion; 43. locking the tongue; 401. a first member; 4011. a restraining post; 402. a second member; 403. a lock tongue sleeve;

50. a guide structure;

61. an induction module; 611. a first sensing part; 612. a second sensing part; 62. a sensed member;

71. a bearing; 72. a gasket; 73. and a clasp.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

FIG. 1 is a schematic diagram showing an assembled structure of a latch bolt device according to an embodiment of the present utility model when the latch bolt device is assembled and the latch bolt device is in a standby state; fig. 2 to 4 are exploded views showing different views of the latch bolt assembly according to the embodiment of the present utility model. In the embodiment of the utility model, the spring bolt device is applied to the turnover screen arranged on the ceiling or the top of the carriage, and the screen turned into the storage position is locked by the spring bolt device so as to prevent the screen from falling out of the storage position.

As shown in fig. 1-4, the latch bolt assembly includes a housing 10, a drive mechanism 20, a threaded rod 30, a latch bolt structure 40, and a guide structure 50, which are assembled to form the latch bolt assembly of the present utility model. Specifically, the housing 10 is divided into two parts of a cover 101 and a main housing 102, and the cover 101 and the main housing 102 are connected by screws. The main casing 102 is provided with a mounting chamber 11 and an opening 12 communicating with the mounting chamber 11, and the mounting chamber 11 is formed as a closed space after the casing cover 101 is mated with the main casing 102. The drive mechanism 20 is mounted in the mounting cavity 11, the drive mechanism 20 including a power take-off structure 210. The screw 30 is rotatably installed in the housing 10 and located in the installation cavity 11, and one end of the screw 30 is in transmission connection with the power output structure 210, wherein the screw 30 is provided with a multi-head thread 31. Locking bolt structure 40 is located in installation cavity 11, and locking bolt structure 40 is equipped with screw hole 41, direction cooperation portion 42 and lock tongue 43, and screw rod 30 wears to locate screw hole 41 and the screw thread of multi-start screw thread 31 and screw thread 41 adaptation ground screw thread cooperation, lock tongue 43 and opening 12 are just to setting. The guide structure 50 is disposed in the mounting cavity 11, and the guide structure 50 and the guide matching portion 42 are matched, so that the multi-head thread 31 drives the lock tongue structure 40 to reciprocate along the axis of the screw 30, and the lock tongue head 43 extends out of the opening 12 or retracts into the mounting cavity 11.

The application of the novel spring bolt device that provides of this adaptation, the spring bolt head 43 of spring bolt structure 40 that the accessible spring bolt device stretches out locks the screen that overturns to the storage position and makes the screen keep in storage position steadily. Specifically, the power output structure 210 of the driving mechanism 20 drives the screw 30 to rotate, the multi-head thread 31 of the screw 30 is matched with the threaded hole 41 of the lock tongue structure 40, so that the screw 30 rotates to drive the lock tongue structure 40, and the lock tongue structure 40 moves linearly and reciprocally along the axis of the screw 30 under the guiding matching action of the guiding structure 50 and the guiding matching part 42, so that the lock tongue 43 extends out of the opening or retracts into the installation cavity 11, the lock tongue 43 extends out of the opening 12 to be in the working state of the lock tongue device, and correspondingly, the lock tongue 43 retracts into the installation cavity 11 to be in the working state of the lock tongue device. When the tongue 43 extends out of the opening 12, the tongue 43 engages the screen, locking the screen and allowing the screen to be held stably in the stowed position. Because the mode of matching the multi-head threads 31 with the threaded holes 41 is adopted between the screw 30 and the lock tongue structure 40, in the process of driving the lock tongue structure 40 to linearly move by the screw 30, the matching between the multi-head threads 31 and the threaded holes 41 can effectively eliminate the pause phenomenon caused by the assembly clearance, so that the lock tongue structure 40 can linearly move more smoothly, noise is effectively reduced or even eliminated, and the use experience of a user is greatly improved.

As shown in fig. 2 to 4, the latch bolt device further includes a sensing module 61 and a sensed member 62, the sensed member 62 is fixedly mounted on the latch bolt structure 40, the fixing manner is not limited, the sensing module 61 is provided with a hole, the hole is fixedly mounted on a wall of the mounting cavity 11 through a screw, and the sensing module 61 is electrically connected with the driving mechanism 20. The sensing module 61 includes a first sensing portion 611 and a second sensing portion 612, where the extending direction of the connection line between the first sensing portion 611 and the second sensing portion 612 is parallel to the axis of the screw 30, and the first sensing portion 611 and the second sensing portion 612 are respectively used for sensing the position of the latch bolt structure 40 driving the sensed member 62 to move when the latch bolt head 43 extends out of the opening 12 or retracts into the mounting cavity 11.

Specifically, the sensed member 62 is made of a magnet, and the first sensing portion 611 and the second sensing portion 612 are hall sensors. In the process that screw 30 drives bolt structure 40 to linearly move, when bolt head 43 of bolt structure 40 extends out of opening 12, bolt structure 40 drives to move together by sensing piece 62, is sensed by second sensing part 612 after bolt head 43 of bolt structure 40 extends out of a certain distance by sensing piece 62, and then sensing module 61 transmits electric signal to driving mechanism 20 to stop driving mechanism 20, at this time, the screen is locked. When the bolt head 43 of the bolt structure 40 needs to retract from the working state to the installation cavity 11, the driving mechanism 20 runs reversely to drive the bolt structure 40 to retract together with the sensed piece 62, when the bolt head 43 of the bolt structure 40 retracts to the installation cavity 11, the sensed piece 62 is sensed by the first sensing part 611, and then the sensing module 61 transmits an electric signal to the driving mechanism 20 to stop the driving mechanism 20, so that the screen can be opened in a rotating way (namely, the screen can be turned out from the storage position).

Further, the locking bolt structure 40 includes a first member 401 and a second member 402, the threaded hole 41 is provided in the first member 401, the second member 402 is an injection molded member and surrounds the first member 401, and the first member 401 is formed with the locking bolt head 43 in an extending manner. The materials of the first member 401 and the second member 402 may be the same, which is not limited herein. As shown in fig. 6, first member 401 is provided with a restraining post 4011, restraining post 4011 is embedded in second member 402, and second member 402 covers first member 401 during injection molding, and at the same time, protects restraining post 4011, thereby fixing first member 401 and second member 402 together. The second member 402 is further provided with an assembly through hole, which may be reserved during injection molding of the second member 402, or may be drilled by drilling after injection molding of the second member 402 is completed, for mounting the sensed member 62, such that the sensed member 62 is fixedly mounted on the locking bolt structure 40.

Further, locking bolt structure 40 also includes a locking bolt sleeve 403, and locking bolt sleeve 403 is wrapped around and secured to the end of locking bolt 43. The latch sleeve 403 may be made of a material softer than the latch head 43, such as a rubber material, so that when the latch head 43 extends out of and into a corresponding lock hole on the screen, the edge of the lock hole of the screen can be well protected from being damaged.

As shown in fig. 1 to 5, the driving mechanism 20 further includes a motor 21 and a worm 22. The worm 22 is fixedly mounted on the rotating shaft of the motor 21. The power output structure 210 includes an input gear 211 and an output gear 212, the input gear 211 is rotatably mounted to the housing 10, the output gear 212 is fixedly mounted to an end portion of the screw 30, and the input gear 211 and the output gear 212 are assembled in a driving manner. The input gear 211 is meshed with the worm 22, wherein the gear of the input gear 211 is helical, and the number of helical teeth of the worm 22 is multiple. The power output structure 210 plays a certain role in decelerating while outputting the power of the motor 21, the first-stage gear adopts a worm helical gear to provide a larger transmission ratio, and the transmission noise is smaller than that of a straight gear, and the worm 22 adopts a multi-head worm, so that the motor can be easily reversely driven, and the self-locking resistance of reverse driving is reduced.

Further, the screw 30 and the input gear 211 may be in interference fit, the end of the screw 30 passes through the input gear 211, the end of the screw 30 is provided with a flat structure 32, the side wall of the housing 10 opposite to the flat structure 32 is provided with an operation through hole 13, and the flat structure 32 of the screw 30 can be accessed through the operation through hole 13. When the electric drive system fails, the operation through hole 13 is used for extending into the manual tool to be matched with the flat structure 32 so as to manually drive the screw 30 to rotate, and the application scene is more flexible.

Screw 30 is provided with multiple threads 31 to enable locking bolt structure 40 to slide more during reciprocating linear movement, noise is smaller, and lifting efficiency is higher at the same rotating speed. The bearing 71 is arranged at two ends of the screw 30, the bearing 71 is in interference fit in a hole formed in the main shell 102, one end of the screw 30, which is in the same extending direction as the locking bolt structure 40, penetrates out of the main shell 102 and the bearing 71, and the clamping ring 73, the gasket 72 and the bearing 71 are arranged to be fixed together, so that the bearing 71 is prevented from falling out. The bearing 71 serves to more smoothly rotate the screw 30 to better transmit power.

Further, the guiding structure 50 includes a guiding rod, the guiding matching portion 42 includes a guiding hole formed in the first member 401, the guiding rod is fixedly mounted on the housing 10 and penetrates through the guiding hole, and an axis of the guiding rod is parallel to an axis of the screw 30. In another case, the guide structure 50 includes a guide groove provided to a cavity wall of the mounting cavity 11, an extending direction of the guide groove being parallel to an axis of the screw 30, and the guide engaging portion 42 includes a projection provided to the second member 402, the projection being inserted into the guide groove.

As shown in fig. 4, installation cavity 11 includes a first compartment 111 for installing drive mechanism 20 and a second compartment 112 for installing screw 30, locking bolt structure 40, and guide structure 50, with first compartment 111. The partition between the first compartment 111 and the second compartment 112 is provided with a hole, and the end of the screw 30 passes through the hole and is in interference fit with the output gear 212 located in the first compartment 111.

By applying the locking bolt device provided by the utility model, the power output structure of the driving mechanism 20 drives the screw rod 30 to rotate, the screw rod 30 drives the locking bolt structure 40 matched with the multi-head thread 31 to move, and the locking bolt structure 40 moves linearly and reciprocally along the axis of the screw rod 30 under the guiding and matching action of the guiding structure 50 and the guiding and matching part 42, so that the locking bolt 43 extends out of the opening or retracts into the mounting cavity 11, the locking bolt 43 extends out of the opening 12 to be in a working state of the locking bolt device, and correspondingly, the locking bolt head 43 retracts into the mounting cavity 11 to be in a waiting working state of the locking bolt device. Because the multi-head threads 31 and the threaded holes 41 matched with the multi-head threads 31 are adopted between the screw 30 and the lock tongue structure 40, in the process that the screw 30 drives the lock tongue structure 40 to reciprocate linearly, the cooperation between the multi-head threads 31 and the threaded holes 41 can effectively eliminate the pause phenomenon caused by the assembly clearance, so that the lock tongue structure 40 can linearly move more smoothly, noise is effectively reduced or even eliminated, and the use experience of a user is greatly improved.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. A deadbolt assembly, comprising:

the device comprises a shell (10), wherein the shell (10) is provided with a mounting cavity (11) and an opening (12) communicated with the mounting cavity (11);

-a drive mechanism (20), the drive mechanism (20) being mounted in the mounting cavity (11), the drive mechanism (20) comprising a power take-off structure (210);

the screw rod (30) is rotatably arranged in the shell (10) and positioned in the installation cavity (11), one end of the screw rod (30) is in transmission connection with the power output structure (210), and the screw rod (30) is provided with a multi-head thread (31);

the bolt structure (40) is positioned in the mounting cavity (11), the bolt structure (40) is provided with a threaded hole (41), a guide matching part (42) and a bolt head (43), the screw (30) is arranged in the threaded hole (41) in a penetrating mode, the multi-head threads (31) are in threaded fit with the threads of the threaded hole (41), and the bolt head (43) and the opening (12) are opposite to each other;

the guide structure (50), the guide structure (50) set up in installation cavity (11), guide structure (50) with guide cooperation portion (42) cooperation, so that bull screw thread (31) drive spring bolt structure (40) follow the axis reciprocating motion of screw rod (30), just spring bolt head (43) stretch out opening (12) or retract to in installation cavity (11).

2. A deadbolt assembly as defined in claim 1 wherein,

the spring bolt device still includes sensing module (61) and is by sensing piece (62), by sensing piece (62) fixed mounting in spring bolt structure (40), sensing module (61) install in installation cavity (11), sensing module (61) with actuating mechanism (20) electric connection, sensing module (61) include first sensing portion (611) and second sensing portion (612), first sensing portion (611) with the extending direction of second sensing portion (612) both links is parallel to the axis of screw rod (30), first sensing portion (611) with second sensing portion (612) are used for the response respectively lock tongue (43) stretch out opening (12) or retract to by the position of sensing piece (62) when installation cavity (11).

3. A deadbolt assembly as defined in claim 2 wherein,

the sensed member (62) is a magnet, and the first sensing part (611) and the second sensing part (612) are hall sensors.

4. A latch bolt assembly according to any one of claims 1 to 3 wherein,

the bolt structure (40) comprises a first member (401) and a second member (402), the threaded hole (41) is formed in the first member (401), the second member (402) is an injection molded member and surrounds the first member (401), and the second member (402) is formed by extending the bolt head (43).

5. The latch bolt assembly of claim 4 wherein the latch bolt assembly comprises a latch bolt assembly,

the first member (401) is provided with a restraining post (4011), and the restraining post (4011) is inlaid in the second member (402).

6. The latch bolt assembly of claim 4 wherein the latch bolt assembly comprises a latch bolt assembly,

the lock tongue structure (40) further comprises a lock tongue sleeve (403), and the lock tongue sleeve (403) is wrapped and fixed at the end part of the lock tongue head (43).

7. A latch bolt assembly according to any one of claims 1 to 3 wherein,

the driving mechanism (20) further comprises a motor (21) and a worm (22), the worm (22) is fixedly arranged on a rotating shaft of the motor (21), the power output structure (210) comprises an input gear (211) and an output gear (212), the input gear (211) is rotatably arranged on the shell (10), the output gear (212) is fixedly arranged at the end part of the screw (30), the input gear (211) and the output gear (212) are assembled in a transmission mode, the input gear (211) is meshed with the worm (22), and gear teeth of the input gear (211) are bevel teeth.

8. The latch bolt assembly of claim 7, wherein the latch bolt assembly comprises a latch bolt assembly,

the number of the spiral teeth of the worm (22) is multiple.

9. The latch bolt assembly of claim 7, wherein the latch bolt assembly comprises a latch bolt assembly,

the end of the screw rod (30) penetrating through the input gear (211) is provided with a flat structure (32), the side wall of the shell (10) right opposite to the flat structure (32) is provided with an operation through hole (13), and the operation through hole (13) is used for extending into a manual tool to be matched with the flat structure (32) so as to manually drive the screw rod (30) to rotate.

10. The latch bolt assembly of claim 4 wherein the latch bolt assembly comprises a latch bolt assembly,

the guide structure (50) comprises a guide rod, the guide matching part (42) comprises a guide hole formed in the first component (401), the guide rod is fixedly installed on the shell (10) and penetrates through the guide hole, and the axis of the guide rod is parallel to the axis of the screw (30);

and/or the guide structure (50) comprises a guide groove arranged on the cavity wall of the mounting cavity (11), the extending direction of the guide groove is parallel to the axis of the screw (30), and the guide matching part (42) comprises a lug arranged on the second component (402), and the lug is inserted into the guide groove.