Lamp

Abstract

The utility model discloses a lamp, and belongs to the field of lighting equipment. The disclosed lamp comprises a first part, a second part and a rotating structure, wherein the first part is rotationally connected with the second part through the rotating structure; wherein the rotating structure comprises a rotating shaft and a first gear, the rotating shaft is fixedly sleeved with the first gear, and the rotating shaft is arranged on the first part and rotationally connected with the second part; the second gear is rotatably arranged on the second part, the second gear is meshed with the first gear, the pre-tightening piece is connected to the second part, and the pre-tightening piece abuts against the end face of the second gear so as to apply pre-tightening force to the second gear. The stress of the rotating structure of the lamp is dispersed, the probability that the angle between the two adjacent parts of the lamp cannot be adjusted is low, and the angle between the first part and the second part of the lamp can be adjusted more reliably.

Description

Technical Field

[0001] The present application belongs to the technical field of lighting equipment, and specifically relates to a lamp. Background Art

[0002] In the prior art, in order to adjust the angle between two adjacent parts of a lamp, a rotating structure is usually connected between the two adjacent parts of the lamp.

[0003] At present, the rotating structure of the lamp generally uses two friction gaskets to adjust the angle between two adjacent parts of the lamp. The stress of this type of rotating structure is mainly concentrated at the contact position of the two friction gaskets. The stress is relatively concentrated. After long-term use, the contact position of the two friction gaskets is prone to wear, resulting in the inability to adjust the angle between the two adjacent parts of the lamp, which in turn makes the lamp unusable. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a lamp that can solve the problem of concentrated stress in the rotating structure of the lamp in the related art.

[0005] The present application provides a lamp, including:

[0006] A first part, a second part and a rotating structure, wherein the first part is rotatably connected to the second part through the rotating structure; wherein the rotating structure comprises:

[0007] A rotating shaft and a first gear, wherein the first gear is fixedly sleeved on the rotating shaft, and the rotating shaft is arranged on the first part and is rotatably connected with the second part;

[0008] A second gear and a preload member, wherein the second gear is rotatably disposed on the second part, the second gear is meshed with the first gear, the preload member is connected to the second part, and the preload member abuts against the end face of the second gear to apply a preload force to the second gear.

[0009] In the embodiment of the present application, the preload member and the second gear are used to resist each other to apply a preload force to the second gear, and the preload force is used to cooperate with the friction force between the first gear and the second gear to achieve the fixing of the angle between the adjacent second part and the first part of the lamp. When it is necessary to adjust the angle between the second part and the first part, an external force is applied to one of the first part and the second part to overcome the preload force and the friction force between the first gear and the second gear, so that the first gear and the second gear rotate relative to each other, and then the angle between the second part and the first part can be adjusted. It can be seen that in the embodiment of the present application, the stress of the rotating structure of the lamp is distributed between the preload member and the second gear and between the first gear and the second gear respectively. In this way, the stress of the rotating structure of the lamp is relatively dispersed, reducing the wear between the preload member and the second gear and between the first gear and the second gear. Compared with the situation in the prior art where the friction plate wears quickly, the probability of the situation where the angle between the two adjacent parts of the lamp cannot be adjusted can be reduced, which makes the angle adjustment between the first part and the second part of the lamp more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic diagram of the internal structure of the lamp disclosed in the embodiment of the present application;

[0011] Figure 2 is an exploded view of the lamp disclosed in the embodiment of the present application;

[0012] Figure 3 is a structural schematic diagram of a positioning structure disclosed in an embodiment of the present application;

[0013] Figure 4 It is a schematic diagram of the structure of the rotating shaft disclosed in the embodiment of the present application;

[0014] Figure 5 It is a partial structural schematic diagram of the lamp disclosed in the embodiment of the present application;

[0015] Figure 6 It is a schematic diagram of the overall structure of the lamp disclosed in the embodiment of the present application.

[0016] Description of reference numerals:

[0017] 100-first part, 101-lamp holder, 102-lamp pole, 103-lamp body, 104-lamp cap;

[0018] 200 - second part, 210 - first limiting rib, 220 - second limiting rib, 230 - accommodating cavity, 240 - opening;

[0019] 300-rotating shaft, 310-second limiting step, 320-limiting plane;

[0020] 400 - first gear, 410 - second positioning plane;

[0021] 500 - second gear;

[0022] 600-preload member, 610-limiting portion, 620-threaded connection portion;

[0023] 700-connecting column; 710-first limiting step;

[0024] 800-positioning structure, 810-connecting sleeve, 820-positioning protrusion, 830-first positioning plane;

[0025] 900-Locking piece. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0027] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0028] The lamp provided in the embodiment of the present application is described in detail below through specific embodiments and application scenarios in conjunction with the accompanying drawings.

[0029] refer to Figure 1-Figure 6 As shown, the lamp provided in the embodiment of the present application includes: a first part 100, a second part 200 and a rotating structure, and the first part 100 is rotatably connected to the second part 200 through the rotating structure.

[0030] The rotating structure includes: a rotating shaft 300, a first gear 400, a second gear 500 and a pre-tightening member 600. The first gear 400 is fixedly sleeved on the rotating shaft 300, and the rotating shaft 300 is arranged on the first part 100 and is rotatably connected to the second part 200. The second gear 500 is rotatably arranged on the second part 200, and the second gear 500 is meshed with the first gear 400. The pre-tightening member 600 is connected to the second part 200, and the pre-tightening member 600 is against the end face of the second gear 500 to apply a pre-tightening force to the second gear 500.

[0031] The lamp rotation structure provided in the embodiment of the present application utilizes the pre-tightening member 600 to resist the second gear 500 to apply a pre-tightening force to the second gear 500, and utilizes the pre-tightening force to cooperate with the friction force between the first gear 400 and the second gear 500 to achieve the fixing of the angle between the adjacent second part 200 and the first part 100 of the lamp. When it is necessary to adjust the angle between the second part 200 and the first part 100, an external force is applied to one of the first part 100 and the second part 200 to overcome the pre-tightening force and the friction force between the first gear 400 and the second gear 500, so that the first gear 400 and the second gear 500 rotate relatively, thereby achieving the adjustment of the angle between the second part 200 and the first part 100. It can be seen that in the embodiment of the present application, the stress of the rotating structure of the lamp is respectively distributed between the preload 600 and the second gear 500 and between the first gear 400 and the second gear 500. In this way, the stress of the rotating structure of the lamp is relatively dispersed, which reduces the wear between the preload 600 and the second gear 500 and between the first gear 400 and the second gear 500. Compared with the situation in the prior art where the friction plate wears quickly, the probability of the angle between two adjacent parts of the lamp being unable to be adjusted can be reduced, which makes the angle adjustment between the first part 100 and the second part 200 of the lamp more reliable.

[0032] In addition, the sound produced by the mutual rotation of the first gear 400 and the second gear 500 is very rhythmic, which can provide users with a new experience and enhance product value and market competitiveness.

[0033] In another embodiment of the present application, Figure 1 and Figure 2As shown, the preload member 600 includes a limit portion 610 and a threaded connection portion 620, wherein the limit portion 610 is fixedly arranged on the threaded connection portion 620 and abuts against the end face of the second gear 500, and the threaded connection portion 620 is threadedly connected to the second portion 200. With such a configuration, the degree of compression of the second gear 500 can be adjusted by rotating the preload member 600, and thus the magnitude of the preload force can be adjusted. More specifically, for example, when the threaded connection portion 620 and the second portion 200 are connected by right-handed threads, the preload member 600 is rotated in a clockwise direction, the degree of compression of the second gear 500 increases, and the preload force increases accordingly. Conversely, the preload member 600 is rotated in a counterclockwise direction, the degree of compression of the second gear 500 decreases, and the preload force decreases accordingly. In addition, with such a configuration, the second gear 500 is easy to disassemble and assemble, and the second gear 500 can be replaced conveniently and quickly.

[0034] In other embodiments, the preload member 600 may also be a preload block welded to the second portion 200. At this time, since the preload block is welded to the second portion 200, the position of the preload block is not adjustable, and thus the preload force applied by the preload block to the second gear 500 is not adjustable.

[0035] Furthermore, if Figure 2 As shown, the lamp also includes a connecting column 700, which is fixedly arranged on the second part 200, and a first limiting step 710 is provided on the connecting column 700. The second gear 500 is rotatably sleeved on the connecting column 700, and the threaded connection part 620 is threadedly connected with the connecting column 700. The first limiting step 710 and the limiting part 610 are respectively located on the opposite sides of the second gear 500, and respectively abut against the two opposite end faces of the second gear 500. In this way, the first limiting step 710 and the limiting part 610 can limit the axial movement of the second gear 500, so that the stability of the second gear 500 can be increased, and the second gear 500 can be prevented from shaking or tilting during use. In addition, in this way, the second gear 500 rubs against the first limiting step 710, but not against the second part 200, so that the damage to the second part 200 can be reduced.

[0036] Furthermore, if Figure 2As shown, the connecting column 700 includes a first cylindrical section and a second cylindrical section arranged coaxially, the cross-sectional diameter of the first cylindrical section is larger than the cross-sectional diameter of the second cylindrical section, the first end of the second cylindrical section is connected to the first end of the first cylindrical section, the second end of the first cylindrical section is connected to the second part 200, the second gear 500 is sleeved on the second cylindrical section, the second cylindrical section is provided with a threaded hole, and the threaded connection part 620 is threadedly connected to the threaded hole. The cross-sectional diameter of the first cylindrical section is larger than the inner diameter of the second gear 500, so as to form the above-mentioned first limiting step 710 at the connection position between the first cylindrical section and the second cylindrical section, and the larger the cross-sectional diameter of the second cylindrical section, the larger the area of ​​the first limiting step 710, and the larger the contact area between the second gear 500 and the first limiting step 710, the greater the friction between the two, and by reasonably controlling the size of the cross-sectional diameter of the first cylindrical section, the friction between the second gear 500 and the first limiting step 710 can be controlled within a reasonable range.

[0037] It can be understood that, in other embodiments, a surface of the second gear 500 facing away from the limiting portion 610 may directly abut against the second portion 200 .

[0038] In another embodiment of the present application, Figure 2 As shown, the first part 100 is provided with a positioning structure 800, and the positioning structure 800 rotates synchronously with the first part 100. The second part 200 is provided with a first limiting surface and a second limiting surface, and the first limiting surface and the second limiting surface are arranged at intervals on the rotation path of the positioning structure 800 to limit the rotation angle of the positioning structure 800. The positioning structure 800 rotates synchronously with the first part 100, and the rotation angle of the first part 100 can be limited by limiting the rotation angle of the positioning structure 800. In this way, the rotation angle of the first part 100 can be limited within a specific range according to the user's use requirements or in order to avoid interference with other parts of the lamp.

[0039] Of course, in other embodiments, the first limiting surface, the second limiting surface and the positioning structure 800 may not be provided.

[0040] Furthermore, if Figure 1As shown, the second part 200 is provided with a first limiting rib 210 and a second limiting rib 220 at intervals, and the first limiting rib 210 and the second limiting rib 220 are both provided on the rotation path of the positioning structure 800, and the positioning structure 800 is at least partially provided between the first limiting rib 210 and the second limiting rib 220, and the first limiting rib 210 is provided with a first limiting surface, and the second limiting rib 220 is provided with a second limiting surface. With such a configuration, when manufacturing the lamp, the positions of the first limiting rib 210 and the second limiting rib 220 can be flexibly adjusted according to the rotation angle requirements of the positioning structure 800, and compared with providing a limiting block on the rotation path of the positioning structure 800, so that the two sides of the limiting block are respectively the first limiting surface and the second limiting surface, the first limiting rib 210 and the second limiting rib 220 are provided separately, and the materials used are less, the material cost is lower, and the weight of the lamp is smaller.

[0041] In other embodiments, a limiting block may be provided on the rotation path of the positioning structure 800, and the two sides of the limiting block are respectively the first limiting surface and the second limiting surface.

[0042] As a specific implementation method, Figure 1 As shown, the first limiting rib 210 and the second limiting rib 220 are arranged on the same plane.

[0043] In another embodiment of the present application, Figure 2-Figure 4 As shown, the rotating shaft 300 is provided with a second limiting step 310, and a locking member 900 is detachably connected thereto. The positioning structure 800 comprises: a connecting sleeve 810 and a positioning protrusion 820; wherein the connecting sleeve 810 and the first gear 400 are sequentially sleeved on the rotating shaft 300 along the axial direction of the rotating shaft 300, the connecting sleeve 810 and the first gear 400 are both located between the locking member 900 and the second limiting step 310, and one of the connecting sleeve 810 and the first gear 400 abuts against the second limiting step 310, and the other abuts against the locking member 900. The positioning protrusion 820 is connected to the outer peripheral surface of the connecting sleeve 810, and protrudes in a direction away from the rotating shaft 300, and the first limiting surface and the second limiting surface are arranged at intervals on the rotation path of the positioning protrusion 820. With such arrangement, the locking member 900 can be removed from the rotation shaft 300 to replace the positioning structure 800 and the first gear 400, and the positioning structure 800 and the first gear 400 are easy to disassemble and assemble.

[0044] In other embodiments, the positioning structure 800 may also only include the positioning protrusion 820 , which is fixed on the outer circumferential surface of the rotating shaft 300 and protrudes in a direction away from the rotating shaft 300 .

[0045] As a specific implementation method, Figure 1As shown, the connecting sleeve 810 abuts against the second limiting step 310, and the first gear 400 abuts against the locking member 900. Of course, in other embodiments, the connecting sleeve 810 abuts against the locking member 900, and the first gear 400 abuts against the second limiting step 310.

[0046] In another embodiment of the present application, Figure 1 As shown, the locking member 900 is sleeved on the rotating shaft 300 and is threadedly connected to the rotating shaft 300. The threaded connection has good connection firmness, and the locking member 900 is not easy to loosen. Further optionally, the locking member 900 here can be a nut.

[0047] In other embodiments, the locking member 900 may also be directly connected to the rotating shaft 300 by snap-fitting.

[0048] In another embodiment of the present application, Figure 4 As shown, the rotating shaft 300 is provided with a limiting plane 320, and the connecting sleeve 810 is provided with a first positioning plane 830, and the first positioning plane 830 is in contact with the limiting plane 320. By making the first positioning plane 830 in contact with the limiting plane 320, the connecting sleeve 810 can be prevented from rotating in the circumferential direction of the rotating shaft 300, and the positioning structure 800 can be fixed in the circumferential direction of the rotating shaft 300. Similarly, the first gear 400 is provided with a second positioning plane 410, and the second positioning plane 410 is in contact with the limiting plane 320. By making the first positioning plane 830 in contact with the limiting plane 320, the connecting sleeve 810 can be prevented from rotating in the circumferential direction of the rotating shaft 300, and the first gear 400 can be fixed in the circumferential direction of the rotating shaft 300. By making the limiting plane 320 fit with the first positioning plane 830 and the limiting plane 320 fit with the second positioning plane 410, the connection sleeve 810 and the first gear 400 can be effectively prevented from rotating relative to the shaft 300, thereby making the rotation between the first part 100 and the second part 200 of the lamp smoother.

[0049] In other embodiments, the connecting sleeve 810 and the first gear 400 can also be sleeved on the rotating shaft 300 by interference fit, bonding, welding, etc. Relatively speaking, when the above-mentioned limiting plane 320 is affixed with the first positioning plane 830 and the limiting plane 320 is affixed with the second positioning plane 410, the disassembly and assembly of the connecting sleeve 810 and the first gear 400 is more convenient.

[0050] Furthermore, if Figure 4As shown, there are two limiting planes 320, and the two limiting planes 320 are parallel and arranged opposite to each other. Correspondingly, there are two first positioning planes 830, and the two first positioning planes 830 are parallel and arranged opposite to each other. There are two second positioning planes 410, and the two second positioning planes 410 are parallel and arranged opposite to each other. The two first positioning planes 830 correspond to the two limiting planes 320 one by one, and each first positioning plane 830 is fitted with the corresponding limiting plane 320. The two second positioning planes 410 correspond to the two limiting planes 320 one by one, and each second positioning plane 410 is fitted with the corresponding limiting plane 320. As the number of limiting planes 320, first positioning planes 830 and second positioning planes 410 increases, the resistance between the rotating shaft 300 and the connecting sleeve 810 and the resistance between the rotating shaft 300 and the first gear 400 are increased, so that the connecting sleeve 810 and the first gear 400 can be better fixed in the circumferential direction of the rotating shaft 300.

[0051] It should be noted that the number of the limiting plane 320 , the first positioning plane 830 , and the second positioning plane 410 is not limited to two, and can be set according to actual needs.

[0052] In another embodiment of the present application, Figure 1 As shown, the number of the second gear 500 and the pre-tightening member 600 are at least two; each second gear 500 is arranged along the circumference of the first gear 400, and each second gear 500 is meshed with the first gear 400; the pre-tightening member 600 corresponds to the second gear 500 one by one, and each pre-tightening member 600 is offset against the second gear 500 corresponding to it. During use, the stress of the rotating structure of the lamp is distributed between the second gear 500 and the first gear 400 and between the first gear 400 and the pre-tightening member 600. By increasing the number of the second gear 500, the stress of the rotating structure of the lamp can be more dispersed, which can further improve the reliability of the angle adjustment between the first part 100 and the second part 200 of the lamp. Of course, in other embodiments, the number of the second gear 500 and the pre-tightening member 600 can be one.

[0053] In specific use, the number of the second gear 500 and the pre-tightening member 600 is selected according to actual needs. Figure 1 The number of the second gear 500 and the number of the pre-tightening member 600 are both two.

[0054] In another embodiment of the present application, the first gear 400 and the second gear 500 are both rotatably disposed in the second part 200, and the preload member 600 is fixedly disposed in the second part 200. In this way, the first gear 400 and the second gear 500 can be protected from external interference and damage.

[0055] In other embodiments, the first gear 400 and the second gear 500 may also be rotatably disposed outside the second portion 200 , while the preload member 600 may be fixedly disposed outside the second portion 200 .

[0056] As a specific implementation method, Figure 1 and Figure 2 As shown, the second part 200 has an accommodating cavity 230 inside, and the second part 200 is provided with an opening 240 connected to the accommodating cavity 230. A part of the rotating shaft 300 extends into the accommodating cavity 230 through the opening 240. The first gear 400 and the second gear 500 are both rotatably disposed in the accommodating cavity 230, and the preload member 600 is fixedly disposed in the accommodating cavity 230.

[0057] In another embodiment of the present application, at least one of the first part 100 and the second part 200 is connected to a light source module.

[0058] Furthermore, the first part 100 or the second part 200 may be, for example, a lamp holder including a light source module.

[0059] As a specific implementation method, Figure 6 As shown, the lamp can be a table lamp, the first part 100 is, for example, a lamp pole 102, the second part 200 is, for example, a lamp body 103, the lamp body 103 is connected to the light source module, or the first part 100 is, for example, a lamp holder 104, the second part 200 is, for example, a lamp body 103, at least one of the lamp holder 104 and the lamp body 103 is connected to the light source module, that is, the light source module is arranged on at least one of the lamp holder 104 and the lamp body 103. Of course, in other embodiments, the first part 100 can also be a lamp holder 101, the second part 200 can also be a lamp pole 102, and the lamp pole 102 is indirectly connected to the light source module through the lamp body 103 or the lamp holder 104. It should be noted that the lamp holder 101, the lamp pole 102, the lamp body 103 and the lamp holder 104 here can be connected in sequence.

[0060] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A lamp, characterized in that: include: A first part (100), a second part (200) and a rotating structure, wherein the first part (100) is rotatably connected to the second part (200) via the rotating structure; wherein the rotating structure comprises: A rotating shaft (300) and a first gear (400), wherein the first gear (400) is fixedly sleeved on the rotating shaft (300), and the rotating shaft (300) is disposed on the first part (100) and is rotatably connected to the second part (200); A second gear (500) and a pre-tightening member (600), wherein the second gear (500) is rotatably disposed on the second part (200), the second gear (500) is meshed with the first gear (400), the pre-tightening member (600) is connected to the second part (200), and the pre-tightening member (600) abuts against an end surface of the second gear (500) to apply a pre-tightening force to the second gear (500).

2. The lamp according to claim 1, characterized in that: The preload member (600) comprises a limiting portion (610) and a threaded connection portion (620); the limiting portion (610) is fixedly arranged on the threaded connection portion (620) and abuts against an end surface of the second gear (500); and the threaded connection portion (620) is threadedly connected to the second portion (200).

3. The lamp according to claim 2, characterized in that: The invention also comprises a connecting column (700), wherein the connecting column (700) is fixedly arranged on the second part (200), the connecting column (700) is provided with a first limiting step (710), the second gear (500) is rotatably sleeved on the connecting column (700), the threaded connecting portion (620) is threadedly connected to the connecting column (700), and the first limiting step (710) and the limiting portion (610) are respectively located on two opposite sides of the second gear (500) and respectively abut against two opposite end faces of the second gear (500).

4. The lamp according to claim 1, characterized in that: The first part (100) is provided with a positioning structure (800), and the positioning structure (800) rotates synchronously with the first part (100). The second part (200) is provided with a first limiting surface and a second limiting surface, and the first limiting surface and the second limiting surface are arranged at intervals on the rotation path of the positioning structure (800) to limit the rotation angle of the positioning structure (800).

5. The lamp according to claim 4, characterized in that: The second part (200) is provided with a first limiting rib (210) and a second limiting rib (220) at intervals, the first limiting rib (210) and the second limiting rib (220) are both arranged on a rotation path of the positioning structure (800), the positioning structure (800) is at least partially arranged between the first limiting rib (210) and the second limiting rib (220), the first limiting rib (210) is provided with the first limiting surface, and the second limiting rib (220) is provided with the second limiting surface.

6. The lamp according to claim 4, characterized in that: The rotating shaft (300) is provided with a second limiting step (310) and is detachably connected to a locking member (900); The positioning structure (800) comprises: a connecting sleeve (810) and a positioning protrusion (820); The connecting sleeve (810) and the first gear (400) are sequentially sleeved on the rotating shaft (300) along the axial direction of the rotating shaft (300); the connecting sleeve (810) and the first gear (400) are both located between the locking member (900) and the second limiting step (310); one of the connecting sleeve (810) and the first gear (400) abuts against the second limiting step (310), and the other abuts against the locking member (900); The positioning protrusion (820) is connected to the outer peripheral surface of the connecting sleeve (810) and protrudes in a direction away from the rotating shaft (300), and the first limiting surface and the second limiting surface are arranged at intervals on the rotation path of the positioning protrusion (820).

7. The lamp according to claim 6, characterized in that: The locking member (900) is sleeved on the rotating shaft (300) and is threadedly connected to the rotating shaft (300).

8. The lamp according to claim 6, characterized in that: The rotating shaft (300) is provided with a limiting plane (320); The connecting sleeve (810) is provided with a first positioning plane (830), and the first positioning plane (830) is in contact with the limiting plane (320) so as to fix the positioning structure (800) in the circumferential direction of the rotating shaft (300); The first gear (400) is provided with a second positioning plane (410), and the second positioning plane (410) is in contact with the limiting plane (320) so as to fix the first gear (400) in the circumferential direction of the rotating shaft (300).

9. The lamp according to claim 1, characterized in that: The number of the second gear (500) and the number of the pre-tightening members (600) are both at least two; Each of the second gears (500) is arranged along the circumference of the first gear (400), and each of the second gears (500) is meshed with the first gear (400); The pre-tightening members (600) correspond to the second gears (500) one by one, and each pre-tightening member (600) abuts against the second gear (500) corresponding to the respective pre-tightening member.

10. The lamp according to claim 1, characterized in that: The first gear (400) and the second gear (500) are both rotatably disposed in the second part (200), and the pre-tightening member (600) is fixedly disposed in the second part (200).

11. The lamp according to claim 1, characterized in that: The first part (100) or the second part (200) is a lamp head (104) comprising a light source module.

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