Adjusting holder base of smoke detector and smoke detector

By designing the adjustable pan-tilt base of the smoke detector, and utilizing the sliding fit between the ball and hemisphere and the locking ring structure, the problems of complex adjustment and easily changeable angle of existing smoke detectors are solved, achieving convenient adjustment without disassembly.

CN224137777UActive Publication Date: 2026-04-17QINHUANGDAO TANDA TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
QINHUANGDAO TANDA TECH CO LTD
Filing Date
2025-05-09
Publication Date
2026-04-17

AI Technical Summary

Technical Problem

Existing linear infrared beam smoke detectors require disassembly and reinstallation during adjustment, making the adjustment process cumbersome and prone to altering the already adjusted angle, and the adjustment structure is complex.

Method used

An adjustable pan-tilt base for a smoke detector is provided, comprising a base shell, a turntable, and a fixed cover. Through the sliding fit between the ball cup and the hemisphere and the design of the fixed column, the turntable can rotate in any direction. Combined with the structure of the locking ring and the pushing ring, adjustment can be achieved without disassembly.

Benefits of technology

It enables convenient adjustment of the smoke detector, simplifies the adjustment process, avoids angle changes caused by disassembly and assembly, and improves the convenience and accuracy of adjustment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides an adjusting holder base of a smoke detector and the smoke detector, and belongs to the field of smoke detectors. The adjusting holder base of the smoke detector comprises a bottom shell, a rotary table and a fixed cover, the bottom shell comprises a convex hemispherical part, and a plurality of fixing columns are arranged on the outer surface of the hemispherical part; the rotary table comprises a concave spherical bowl part, the spherical bowl part is provided with a plurality of avoiding holes, the spherical bowl part covers the hemispherical part, the multiple avoiding holes sleeve the multiple fixing columns respectively, gaps are formed between the hole walls of the avoiding holes and the fixing columns, and the inner surface of the spherical bowl part is in sliding fit with the outer surface of the hemispherical part; the fixing cover is located on the side, away from the hemisphere part, of the spherical bowl part and connected with the multiple fixing columns so as to limit the rotary table to move in the direction away from the hemisphere part. And the spherical bowl part is in sliding fit with the hemispherical part, so that the turntable can rotate in any direction relative to the bottom shell. The detector body of the smoke detector can be installed on the rotary table, so that the detector body can rotate in any direction relative to the bottom shell along with the rotary table, and adjustment of the smoke detector is facilitated.
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Description

Technical Field

[0001] This application relates to the field of smoke detectors, and in particular to an adjustable pan-tilt base for a smoke detector and a smoke detector. Background Technology

[0002] Smoke detectors are widely used in various fire alarm systems and can trigger an alarm in the event of a fire.

[0003] Linear infrared beam smoke detectors are a common type of smoke detector, placed opposite a reflector during use. Structurally, this type of smoke detector includes a transmitting section and a receiving section. The transmitting section emits an infrared beam of a certain intensity, which is reflected by the reflector. The receiving section synchronously collects and amplifies the returned infrared beam, and analyzes the collected signal using a built-in microcontroller. When smoke enters the detection area, the smoke blocks the infrared beam, reducing the intensity of the infrared light received by the receiving section, thus triggering an alarm.

[0004] Linear infrared beam smoke detectors and reflectors have high placement requirements. During installation, the linear infrared beam smoke detector generally needs adjustment to ensure that the infrared beam emitted by the emitting part illuminates the reflector and that the receiving part receives the reflected infrared beam. However, the adjustment structure of linear infrared beam smoke detectors in related technologies is usually quite complex. Adjustment often requires disassembly and reinstallation of parts of the structure. This disassembly and reassembly process is not only cumbersome, but reinstallation can also easily cause the already adjusted angle to change, making the adjustment process very inconvenient. Utility Model Content

[0005] This application provides an adjustable pan-tilt base for a smoke detector and a smoke detector itself, eliminating the need for structural disassembly and assembly, thus facilitating the adjustment of the smoke detector. The technical solution is as follows:

[0006] In a first aspect, embodiments of this application provide an adjustable pan-tilt base for a smoke detector, the adjustable pan-tilt base for the smoke detector comprising a base shell, a turntable, and a fixing cover; the base shell comprises an outwardly convex hemispherical portion, the outer surface of which has a plurality of fixing posts; the turntable comprises an inwardly concave spherical cup portion, the spherical cup portion having a plurality of clearance holes, the spherical cup portion covering the hemispherical portion, the plurality of clearance holes respectively fitting around the plurality of fixing posts, and the hole walls of the clearance holes having gaps with the fixing posts, the inner surface of the spherical cup portion slidingly engaging with the outer surface of the hemispherical portion; the fixing cover is located on the side of the spherical cup portion away from the hemispherical portion and is connected to the plurality of fixing posts to restrict the movement of the turntable in a direction away from the hemispherical portion.

[0007] In some examples, the outer surface of the spherical bowl is a hemispherical convex surface, and the fixing cover fits against the outer surface of the spherical bowl.

[0008] In some examples, the bottom shell further includes a first cylindrical portion that is fitted over the hemispherical portion, and one end of the first cylindrical portion is connected to the hemispherical portion;

[0009] The turntable further includes a second cylindrical portion, which is fitted outside the ball cup portion, and one end of the second cylindrical portion is connected to the ball cup portion. Both the ball cup portion and one end of the second cylindrical portion are located in the first cylindrical portion, and there is a gap between the second cylindrical portion and the first cylindrical portion.

[0010] In some examples, the turntable further includes a third cylindrical portion that is fitted over the second cylindrical portion and connected to the other end of the second cylindrical portion. The third cylindrical portion is located outside the first cylindrical portion and has a gap between it and the first cylindrical portion.

[0011] In some examples, the end of the second cylindrical portion connected to the ball-shaped portion has two limiting protrusions, which are arranged at intervals along the circumference of the second cylindrical portion.

[0012] The bottom shell also includes a limiting part, which is located in the first cylindrical part and between the hemispherical part and the first cylindrical part;

[0013] The limiting portion is located between the two limiting protrusions and has a gap with at least one of the limiting protrusions.

[0014] In some examples, the hemisphere has a first through hole in the middle, the bowl has a second through hole in the middle, the second through hole communicates with the first through hole, and the fixed cover has a third through hole in the middle, the third through hole communicates with the second through hole. The first through hole, the second through hole and the third through hole are used to arrange wire harnesses.

[0015] An annular sealing ring is fixed to the inner surface of the ball bowl portion. The annular sealing ring abuts against the outer surface of the hemisphere portion to form a seal. The annular sealing ring surrounds the first through hole, the second through hole, and the third through hole.

[0016] In some examples, the annular sealing ring and the turntable are secondary injection molded parts.

[0017] In some examples, there is an annular gap between the edge of the inner surface of the bowl portion and the outer surface of the hemisphere portion;

[0018] The adjustable gimbal base also includes a locking ring, which is fitted over the hemisphere and can move in a direction away from the hemisphere into the annular gap to lock the turntable.

[0019] In some examples, the locking ring has a plurality of grooves on the side away from the ball cup portion, the plurality of grooves being distributed at circumferential intervals along the locking ring;

[0020] The adjustable gimbal base also includes a push ring, which is sleeved outside the hemisphere. The push ring is located on the side of the locking ring away from the ball cup and can rotate relative to the locking ring. The side of the push ring near the locking ring has multiple wedge-shaped protrusions, which are respectively located in the multiple grooves. The wedge-shaped protrusions are used to move with the push ring to the outside of the grooves to push the locking ring to move into the annular gap.

[0021] Secondly, this application also provides a smoke detector, which includes a detector body and any of the adjustable pan-tilt bases described in the first aspect, wherein the detector body is connected to the turntable.

[0022] The beneficial effects of the technical solutions provided in this application include at least the following:

[0023] By covering the concave spherical cup portion of the turntable with the convex hemispherical portion of the base shell, the spherical cup portion and the hemispherical portion slide together, allowing the turntable to rotate relative to the base shell in any direction. Multiple clearance holes are provided in the spherical cup portion, and multiple fixing posts are provided on the outer surface of the hemispherical portion. These fixing posts are located within the clearance holes, with gaps between the hole walls and the outer walls of the fixing posts, allowing the turntable to rotate relative to the base shell within a certain range without being restricted by the fixing posts. A fixing cover is provided on the side of the spherical cup portion away from the hemispherical portion, and this cover is connected to the multiple fixing posts, confining the spherical cup portion between the hemispherical portion and the fixing cover, preventing separation of the spherical cup portion from the hemispherical portion. The detector body of the smoke detector can be mounted on the turntable, allowing the detector body to rotate relative to the base shell in any direction with the turntable, facilitating the adjustment of the smoke detector. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a smoke detector provided in an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the structure of an adjustable pan-tilt base for a smoke detector provided in an embodiment of this application;

[0027] Figure 3 This is an assembly diagram of a base shell and a turntable provided in an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the internal structure of an adjustable gimbal base provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of a turntable provided in an embodiment of this application.

[0030] Icon labels:

[0031] 10 - Detector body;

[0032] 20-Adjustable gimbal base; 21-Bottom shell; 21a-Annular gap; 211-Hemispherical part; 211a-First through hole; 212-Fixing post; 213-First cylindrical part; 214-Limiting part; 22-Turntable; 221-Spherical cup part; 2211-Annular sealing ring; 221a-Allowing hole; 221b-Second through hole; 222-Second cylindrical part; 223-Third cylindrical part; 224-Limiting protrusion; 23-Fixing cover; 23a-Third through hole; 24-Locking ring; 241-Ear plate; 24a-Groove; 25-Push ring; 251-Wedge-shaped protrusion; 26-Adjusting component; 27-Waterproof connector. Detailed Implementation

[0033] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0034] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0035] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0036] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. "A plurality" means two or more.

[0039] Figure 1 This is a schematic diagram of the structure of a smoke detector provided in an embodiment of this application, as shown below. Figure 1 As shown, the smoke detector includes a detector body 10 and an adjustable pan-tilt base 20, with the detector body 10 mounted on the adjustable pan-tilt base 20.

[0040] Figure 2 This is a schematic diagram of the structure of an adjustable pan-tilt base for a smoke detector provided in an embodiment of this application, as shown below. Figure 2 As shown, the adjustable pan-tilt base of the smoke detector includes a base shell 21, a turntable 22, and a fixed cover 23. In the smoke detector, the detector body 10 can be connected to the turntable 22.

[0041] Figure 3 This is an assembly diagram of a base shell and a turntable provided in an embodiment of this application, as shown below. Figure 3As shown, the bottom shell 21 includes a convex hemispherical portion 211, and the outer surface of the hemispherical portion 211 has a plurality of fixing posts 212. The turntable 22 includes a concave spherical cup portion 221, and the spherical cup portion 221 has a plurality of clearance holes 221a. The spherical cup portion 221 covers the hemispherical portion 211, and the plurality of clearance holes 221a are respectively fitted around the plurality of fixing posts 212, and the hole wall of the clearance hole 221a has a gap with the fixing post 212. The inner surface of the spherical cup portion 221 slides in fit with the outer surface of the hemispherical portion 211.

[0042] The fixing cover 23 is located on the side of the ball bowl 221 away from the hemisphere 211. The fixing cover 23 is connected to a plurality of fixing posts 212 to restrict the turntable 22 from moving in the direction away from the hemisphere 211.

[0043] By covering the concave spherical cup portion 221 of the turntable 22 with the convex hemispherical portion 211 of the bottom shell 21, the spherical cup portion 221 and the hemispherical portion 211 slide together, allowing the turntable 22 to rotate relative to the bottom shell 21 in any direction. By providing multiple clearance holes 221a in the spherical cup portion 221 and multiple fixing posts 212 on the outer surface of the hemispherical portion 211, with each fixing post 212 located within a clearance hole 221a and a gap between the hole wall of the clearance hole 221a and the outer wall of the fixing post 212, the turntable 22 can rotate relative to the bottom shell 21 within a certain range without being restricted by the fixing posts 212. By providing a fixing cover 23 on the side of the spherical cup portion 221 away from the hemispherical portion 211 and connecting the fixing cover 23 to the multiple fixing posts 212, the spherical cup portion 221 is confined between the hemispherical portion 211 and the fixing cover 23, preventing separation of the spherical cup portion 221 from the hemispherical portion 211. The detector body 10 of the smoke detector can be mounted on the turntable 22, so that the detector body 10 can rotate in any direction relative to the bottom shell 21 with the turntable 22, which facilitates the adjustment of the smoke detector.

[0044] In this embodiment, the outer surface of the hemispherical portion 211 may include a portion of a sphere, such as a spherical cap. The height of the spherical cap may be less than or equal to the radius of the sphere. When the height of the spherical cap is equal to the radius of the sphere, the spherical cap is a hemisphere. The bottom of the spherical cap is circular. The inner surface of the spherical bowl portion 221 slides with the outer surface of the hemispherical portion 211, allowing the turntable 22 to rotate relative to the bottom shell 21. This rotation may include rotation about two mutually perpendicular diameters around the bottom of the spherical cap, as well as rotation about the height of the spherical cap.

[0045] Figure 4 This is a schematic diagram of the internal structure of an adjustable gimbal base provided in an embodiment of this application, as shown below. Figure 4 As shown, the outer surface of the ball bowl 221 is a hemispherical convex surface, and the fixing cover 23 is attached to the outer surface of the ball bowl 221.

[0046] By setting the outer surface of the ball bowl portion 221 as a hemispherical convex surface, and attaching the fixing cover 23 to the outer surface of the ball bowl portion 221, the ball bowl portion 221 slides on the surface of the fixing cover 23 during the rotation of the turntable 22. The concave surface of the fixing cover 23 near the ball bowl portion 221, together with the outer surface of the hemispherical portion 211, restricts the ball bowl portion 221, preventing it from moving away from the hemispherical portion 211 without affecting its rotation.

[0047] like Figure 4 As shown, the bottom shell 21 further includes a first cylindrical portion 213, which is fitted over the hemispherical portion 211, and one end of the first cylindrical portion 213 is connected to the hemispherical portion 211. The turntable 22 further includes a second cylindrical portion 222, which is fitted over the spherical cup portion 221, and one end of the second cylindrical portion 222 is connected to the spherical cup portion 221. One end of both the spherical cup portion 221 and the second cylindrical portion 222 is located within the first cylindrical portion 213, and there is a gap between the second cylindrical portion 222 and the first cylindrical portion 213.

[0048] The first cylindrical portion 213 surrounds the hemispherical portion 211, the spherical cup portion 221, and the second cylindrical portion 222, providing protection for the turntable 22. The arrangement of the first cylindrical portion 213 and the second cylindrical portion 222 also prevents foreign objects from entering between the outer surface of the hemispherical portion 211 and the inner surface of the spherical cup portion 221, thus avoiding interference with the rotation of the turntable 22. The gap between the first cylindrical portion 213 and the second cylindrical portion 222 ensures that the rotation of the turntable 22 is unaffected by the first cylindrical portion 213.

[0049] like Figure 4 As shown, the turntable 22 also includes a third cylindrical portion 223, which is fitted over the second cylindrical portion 222. One end of the second cylindrical portion 222 is connected to the ball-and-socket portion 221, and the third cylindrical portion 223 is connected to the other end of the second cylindrical portion 222. The third cylindrical portion 223 is located outside the first cylindrical portion 213 and has a gap between it and the first cylindrical portion 213.

[0050] By providing a third cylindrical portion 223 connected to the second cylindrical portion 222 outside the first cylindrical portion 213, and the gap between the third cylindrical portion 223 and the first cylindrical portion 213 connecting the gap between the second cylindrical portion 222 and the first cylindrical portion 213, it becomes more difficult for foreign objects to enter between the outer surface of the hemispherical portion 211 and the inner surface of the spherical bowl portion 221 through the gap between the turntable 22 and the bottom shell 21, further preventing the rotation of the turntable 22 from being affected. The gap between the first cylindrical portion 213 and the third cylindrical portion 223 ensures that the rotation of the turntable 22 is not affected by the third cylindrical portion 223.

[0051] The size of the gap between the first cylindrical part 213 and the second cylindrical part 222, and the size of the gap between the first cylindrical part 213 and the third cylindrical part 223, can be set according to the rotation range of the turntable 22. The larger the rotation range, the larger the gap is set, and the smaller the rotation range, the smaller the gap is set.

[0052] For example, the turntable 22 can rotate 16° around any diameter of the bottom of the spherical crown surface. That is, based on the state when the height of the inner surface of the bowl portion 221 coincides with the height of the outer surface of the hemisphere portion 211, the turntable 22 can rotate up to 8° in any direction around any diameter of the bottom of the spherical crown surface.

[0053] Figure 5 This is a schematic diagram of a turntable structure provided in an embodiment of this application, as shown below. Figure 5 As shown, the end of the second cylindrical portion 222 connected to the ball bowl portion 221 has two limiting protrusions 224, which are arranged at intervals along the circumference of the second cylindrical portion 222.

[0054] Reference Figure 3 The bottom shell 21 also includes a limiting portion 214, which is located in the first cylindrical portion 213 and between the hemispherical portion 211 and the first cylindrical portion 213. The limiting portion 214 is located between two limiting protrusions 224 and has a gap with at least one limiting protrusion 224.

[0055] The two limiting protrusions 224 can limit the limiting part 214. During the high-speed rotation of the turntable 22 around the spherical surface, the two limiting protrusions 224 move relative to the limiting part 214 with the turntable 22, which is equivalent to the limiting part 214 moving between the two limiting protrusions 224 relative to the turntable 22. When the turntable 22 rotates in one direction until the limiting part 214 contacts one of the limiting protrusions 224, the rotation of the turntable 22 in that direction reaches its maximum angle, thus limiting the range of high-speed rotation of the turntable 22 around the spherical surface.

[0056] By changing the distance between the two limiting protrusions 224, the range of high rotation of the turntable 22 around the spherical surface can be changed. As an example, the maximum angle of high rotation of the turntable 22 around the spherical surface can be 2°, that is, from the moment the limiting part 214 contacts either of the limiting protrusions 224, the turntable 22 rotates by an angle of 2° until the limiting part 214 contacts the other limiting protrusion 224.

[0057] like Figure 4As shown, the hemispherical portion 211 has a first through hole 211a in its middle, and the spherical cup portion 221 has a second through hole 221b in its middle, the second through hole 221b communicating with the first through hole 211a. The fixing cover 23 has a third through hole 23a in its middle, the third through hole 23a communicating with the second through hole 221b. The first through hole 211a, the second through hole 221b, and the third through hole 23a are used to arrange wire harnesses.

[0058] The turntable 22 can be used to install the detector body 10, which requires a wiring harness, such as a power supply line and a signal transmission line. By providing a connecting first through hole 211a, a second through hole 221b, and a third through hole 23a, the wiring harness can pass normally through the bottom shell 21, the turntable 22, and the fixed cover 23.

[0059] like Figure 4 As shown, an annular sealing ring 2211 is fixed on the inner surface of the ball-shaped cup portion 221, and the annular sealing ring 2211 abuts against the outer surface of the hemispherical portion 211 to form a seal. The annular sealing ring 2211 surrounds the first through hole 211a, the second through hole 221b and the third through hole 23a.

[0060] An annular sealing ring 2211 is arranged around the first through hole 211a, the second through hole 221b, and the third through hole 23a to seal the gap between the outer surface of the hemisphere 211 and the inner surface of the bowl 221, thereby preventing external water from entering the first through hole 211a, the second through hole 221b, and the third through hole 23a through the gap between the outer surface of the hemisphere 211 and the inner surface of the bowl 221.

[0061] For example, the annular sealing ring 2211 can be a silicone ring or a rubber ring.

[0062] The annular sealing ring 2211 is elastic and can generate damping when it abuts against the outer surface of the hemispherical part 211, so that after the turntable 22 is adjusted, the turntable 22 can remain relatively stationary with the bottom shell 21 under the damping action of the annular sealing ring 2211.

[0063] In some examples, the annular seal 2211 and the turntable 22 can be secondary injection molded parts.

[0064] The annular sealing ring 2211 and the turntable 22 are manufactured using a two-stage injection molding process. For example, one material is injected into the mold to form the turntable 22, and then another material is injected to form the annular sealing ring 2211 on the inner surface of the ball cup 221. Finally, the mold is opened and the turntable 22 and the annular sealing ring 2211 are removed.

[0065] The use of a two-stage injection molding process can make the connection between the annular sealing ring 2211 and the ball cup 221 tighter, preventing the annular sealing ring 2211 from separating from the ball cup 221 during the rotation of the turntable 22.

[0066] In some examples, the adjustable gimbal base may also include a waterproof connector 27, which can be inserted into the first through hole 211a. The waterproof connector 27 has a channel through which the wiring harness can pass to further enhance waterproofing.

[0067] like Figure 4 As shown, there is an annular gap 21a between the edge of the inner surface of the ball cup portion 221 and the outer surface of the hemispherical portion 211. The adjustment gimbal base also includes a locking ring 24, which is fitted over the hemispherical portion 211. The locking ring 24 can move in a direction away from the hemispherical portion 211 into the annular gap 21a to lock the turntable 22.

[0068] After the turntable 22 is adjusted into position, the locking ring 24 is moved to enter the annular gap 21a, which presses against the inner surface of the ball cup 221, thereby locking the turntable 22 and preventing it from rotating due to external environmental factors, such as preventing the turntable 22 from rotating due to wall vibration.

[0069] like Figure 4 As shown, the inner and outer surfaces of the locking ring 24 can be spherical surfaces. The inner surface of the locking ring 24 can fit against the outer surface of the hemisphere 211, and the end of the locking ring 24 near the ball cup 221 can be located in the annular gap 21a. The outer surface of the locking ring 24 can fit against or have a clearance fit with the edge of the inner surface of the ball cup 221. During the movement of the locking ring 24 away from the hemisphere 211, the locking ring 24 moves further into the annular gap 21a, and is pressed against the edge of the inner surface of the ball cup 221.

[0070] Reference Figure 2 As shown, the locking ring 24 has a plurality of grooves 24a on the side away from the ball cup portion 221, and the plurality of grooves 24a are distributed at intervals along the circumference of the locking ring 24.

[0071] The adjustable gimbal base also includes a push ring 25, which is fitted over the hemispherical portion 211. The push ring 25 is located on the side of the locking ring 24 away from the ball cup portion 221 and is rotatable relative to the locking ring 24. The side of the push ring 25 near the locking ring 24 has multiple wedge-shaped protrusions 251, which are respectively located in multiple grooves 24a. The wedge-shaped protrusions 251 are used to move with the push ring 25 out of the grooves 24a to push the locking ring 24 into the annular gap 21a.

[0072] When the wedge-shaped protrusion 251 is located in the groove 24a, the inner surface of the locking ring 24 can fit against the outer surface of the hemisphere 211. As the wedge-shaped protrusion 251 gradually moves outward from the groove 24a with the rotation of the push ring 25, it contacts the edge of the groove 24a and pushes the locking ring 24 away from the hemisphere 211, causing the locking ring 24 to gradually move into the annular gap 21a and gradually squeeze the edge of the inner surface of the ball cup 221. When the wedge-shaped protrusion 251 has completely moved out of the groove 24a, the squeezing effect of the locking ring 24 on the ball cup 221 reaches its maximum, and the turntable 22 is locked. Reversing the rotation of the push ring 25 to return the wedge-shaped protrusion 251 to the groove 24a unlocks the turntable 22.

[0073] One side wall of the wedge-shaped protrusion 251 is an inclined surface, and one side wall of the groove 24a can also be an inclined surface. When the wedge-shaped protrusion 251 is located in the groove 24a, the inclined surface of the wedge-shaped protrusion 251 is opposite to the inclined surface of the groove 24a. As the wedge-shaped protrusion 251 moves out of the groove 24a, the inclined surface of the wedge-shaped protrusion 251 slides along the inclined surface of the groove 24a. Through the cooperation between the two inclined surfaces, the wedge-shaped protrusion 251 can be easily moved to the outside of the groove 24a, so that the squeezing force of the locking ring 24 on the ball cup portion 221 can be gradually increased.

[0074] Reference Figure 2 As shown, multiple ear plates 241 can be connected to the outer side of the locking ring 24. The ear plates 241 have limiting through holes. A limiting post can also be provided in the bottom shell 21. The limiting post can be located between the hemispherical part 211 and the first cylindrical part 213. The limiting through holes of the ear plates 241 are sleeved on the limiting post. The limiting through holes and the limiting post are fitted with a clearance, so that the ear plates 241 can move along the limiting post. The cooperation of multiple ear plates 241 and multiple limiting posts enables the locking ring 24 to move in a direction away from or close to the hemispherical part 211.

[0075] like Figure 2 As shown, the adjustable gimbal base may also include an adjusting member 26, which may be located outside the first cylindrical portion 213. The first cylindrical portion 213 may have a sliding groove, and a portion of the adjusting member 26 passes through the sliding groove and is connected to the push ring 25. The adjusting member 26 slides in the sliding groove and can rotate circumferentially along the first cylindrical portion 213. Thus, by rotating the adjusting member 26, the push ring 25 can be driven to lock or unlock the turntable 22.

[0076] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A smoke detector adjusting gimbal base, characterized in that, The system includes a bottom shell (21), a turntable (22), and a fixing cover (23). The bottom shell (21) includes a convex hemispherical portion (211), the outer surface of which has multiple fixing posts (212). The turntable (22) includes a concave spherical cup portion (221), the spherical cup portion (221) having multiple clearance holes (221a). The spherical cup portion (221) covers the hemispherical portion (211), and the multiple clearance holes (221a) are respectively fitted onto the hemispherical portion. In addition to the plurality of fixed posts (212), the wall of the clearance hole (221a) has a gap with the fixed post (212), the inner surface of the ball cup (221) slides with the outer surface of the hemisphere (211); the fixed cover (23) is located on the side of the ball cup (221) away from the hemisphere (211) and is connected to the plurality of fixed posts (212) to restrict the turntable (22) from moving in a direction away from the hemisphere (211).

2. The pan and tilt mount of claim 1, wherein, The outer surface of the ball bowl (221) is a hemispherical convex surface, and the fixing cover (23) is attached to the outer surface of the ball bowl (221).

3. The pan and tilt mount of claim 1, wherein, The bottom shell (21) further includes a first cylindrical part (213), which is fitted over the hemispherical part (211), and one end of the first cylindrical part (213) is connected to the hemispherical part (211); The turntable (22) further includes a second cylindrical part (222), which is fitted outside the ball cup part (221), and one end of the second cylindrical part (222) is connected to the ball cup part (221). One end of the ball cup part (221) and one end of the second cylindrical part (222) are both located in the first cylindrical part (213), and there is a gap between the second cylindrical part (222) and the first cylindrical part (213).

4. The pan and tilt mount of claim 3, wherein, The turntable (22) further includes a third cylindrical part (223), which is sleeved outside the second cylindrical part (222) and connected to the other end of the second cylindrical part (222). The third cylindrical part (223) is located outside the first cylindrical part (213) and has a gap with the first cylindrical part (213).

5. The pan and tilt mount of claim 3, wherein, The end of the second cylindrical portion (222) connected to the ball bowl portion (221) has two limiting protrusions (224), which are arranged at intervals along the circumference of the second cylindrical portion (222). The bottom shell (21) further includes a limiting part (214), which is located in the first cylindrical part (213) and between the hemispherical part (211) and the first cylindrical part (213); The limiting part (214) is located between the two limiting protrusions (224) and has a gap with at least one of the limiting protrusions (224).

6. A pan and tilt head according to any one of claims 1 to 5, characterised in that, The hemispherical part (211) has a first through hole (211a) in the middle, the ball bowl part (221) has a second through hole (221b) in the middle, the second through hole (221b) communicates with the first through hole (211a), the fixed cover (23) has a third through hole (23a) in the middle, the third through hole (23a) communicates with the second through hole (221b), the first through hole (211a), the second through hole (221b) and the third through hole (23a) are used to arrange wire harnesses; An annular sealing ring (2211) is fixed on the inner surface of the ball bowl part (221). The annular sealing ring (2211) abuts against the outer surface of the hemisphere part (211) to form a seal. The annular sealing ring (2211) surrounds the first through hole (211a), the second through hole (221b) and the third through hole (23a).

7. The pan and tilt mount of claim 6, wherein, The annular sealing ring (2211) and the turntable (22) are secondary injection molded parts.

8. A pan and tilt head according to any one of claims 1 to 5, characterized in that There is an annular gap (21a) between the edge of the inner surface of the ball bowl portion (221) and the outer surface of the hemisphere portion (211); The adjustable gimbal base also includes a locking ring (24), which is fitted over the hemisphere (211) and can move in a direction away from the hemisphere (211) into the annular gap (21a) to lock the turntable (22).

9. The pan and tilt mount of claim 8, wherein, The locking ring (24) has a plurality of grooves (24a) on the side away from the ball cup portion (221), and the plurality of grooves (24a) are distributed at intervals along the circumference of the locking ring (24); The adjustable gimbal base also includes a push ring (25), which is sleeved on the outside of the hemisphere (211). The push ring (25) is located on the side of the locking ring (24) away from the ball cup (221) and can rotate relative to the locking ring (24). The push ring (25) has a plurality of wedge-shaped protrusions (251) on the side near the locking ring (24). The plurality of wedge-shaped protrusions (251) are respectively located in the plurality of grooves (24a). The wedge-shaped protrusions (251) are used to move with the push ring (25) to the outside of the grooves (24a) to push the locking ring (24) to move towards the annular gap (21a).

10. A smoke detector, characterized in that It includes a detector body (10) and an adjustable gimbal base (20) as described in any one of claims 1 to 9, wherein the detector body (10) is connected to the turntable (22).