Clamping device and mobile phone support

Abstract

The utility model relates to the technical field of mobile phone accessories, in particular to a clamping device and a mobile phone support. The clamping device comprises a shell, two clamping arms and a transmission assembly, a containing space is formed in the shell, and a center shaft and a sliding rail are arranged in the shell; the two clamping arms are arranged on the two opposite sides of the shell respectively, one clamping arm is provided with an elastic piece, one end of the elastic piece is arranged in the clamping arm, and the other end of the elastic piece is connected with the center shaft. The transmission assembly comprises a gear and two connecting arms, the gear is rotationally arranged on the center shaft in a sleeving mode, the two connecting arms are arranged on the two opposite sides of the gear respectively, gear teeth used for being connected with the gear in a meshed mode are arranged on the connecting arms, the connecting arms are rotationally connected with the clamping arms, and the clamping arms are connected with the gear. The connecting arm is connected with the sliding rail in a sliding mode. The problem that clamping jaws on the two sides of a clamping device in the prior art cannot move in a linkage mode is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of mobile phone accessories, in particular to a clamping device and a mobile phone bracket. Background Art

[0002] With the popularity of smart phones, people generally need a bracket that can support or carry electronic devices. Therefore, a mobile phone bracket is designed based on ergonomics to enable people to use electronic devices in a more comfortable way.

[0003] There are many types of electronic device brackets in the prior art, especially for neck-hanging brackets, in order to reduce the pressure on the neck, the clamping device is usually set to be relatively small. However, due to the internal space of the clamping device, it is not possible to form a good linkage between the two clamping arms to better adapt to clamping the electronic device. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the utility model is to provide a clamping device and a mobile phone holder to solve the problem that the clamping claws on both sides of the clamping device in the prior art cannot move in a linked manner.

[0005] In the first aspect, the utility model discloses a clamping device, comprising: a shell, two clamping arms and a transmission assembly, the shell having a accommodating space, and a central axis and a slide rail being arranged in the shell; the two clamping arms are respectively arranged on opposite sides of the shell, and one of the clamping arms is provided with an elastic member, one end of the elastic member is arranged in the clamping arm, and the other end is connected to the central axis; the transmission assembly comprises a gear and two connecting arms, the gear is rotatably sleeved on the central axis, the two connecting arms are respectively arranged on opposite sides of the gear, the connecting arms are provided with gear teeth for meshing with the gear, the connecting arm is rotatably connected to the clamping arm, and the connecting arm is slidably connected to the slide rail.

[0006] Optionally, the clamping arm includes a clamping portion and a connecting portion connected to each other, the shell is provided with a through hole, the connecting portion passes through the through hole to be connected to the clamping portion, the connecting portion is a hollow structure, and the elastic member is accommodated in the connecting portion.

[0007] Optionally, two adjacent limiting rings are provided on the connecting portion, a clamping groove is formed between the two limiting rings, and a buckle is provided on the connecting arm, and the buckle is engaged and connected with the clamping groove.

[0008] Optionally, the shell includes a first half body and a second half body, the central axis and the slide rail are arranged on the first half body, and the second half body is provided with a limiting platform for limiting the connection arm.

[0009] Optionally, the connecting arm includes a first connecting segment and a second connecting segment connected in sequence, the first connecting segment and the second connecting segment are in a Z-shaped structure, an abutting portion for abutting against the limit platform is formed between the first connecting segment and the second connecting segment, and the gear teeth are arranged on the second connecting segment.

[0010] Optionally, the clamping device further comprises a bracket and a screw, wherein the screw is mounted on the second half body, and the bracket is rotatably connected to the screw.

[0011] Optionally, a boss is provided on the outer surface of the second half body, at least one sinking groove is provided in the boss, a spring ball is provided in the sinking groove, the spring ball protrudes from the sinking groove and is exposed, and a plurality of limiting grooves for cooperating with the spring ball are provided on the side of the bracket facing the boss.

[0012] Optionally, the clamping portion is a contoured structure of the outer contour of the shell, a positioning protrusion is provided on the side of the clamping portion facing the first half body, and a positioning groove cooperating with the positioning protrusion is provided on the first half body.

[0013] Optionally, the clamp arm is provided with a fixed shaft passing through the clamp arm, one end of the elastic member is connected to the fixed shaft, and the other end is connected to the central shaft.

[0014] In a second aspect, the utility model discloses a mobile phone holder, comprising a lanyard and any one of the clamping devices described above, wherein the lanyard is connected to the clamping device.

[0015] Compared with the prior art, the clamping device and mobile phone holder provided by the embodiment of the utility model have the beneficial effect that: a central axis and a slide rail are provided in the housing, and the connecting arm in the transmission assembly is arranged in the slide rail and can slide relative to the housing through the slide rail. A gear is sleeved on the central axis, and the gear can rotate relative to the central axis. Connecting arms are respectively provided on both sides of the central axis, and gear teeth are provided on the connecting arms to cooperate with the gear, and the connecting arms are connected to the clamping arms, so when the clamping arms on one side move relative to the housing, the connecting arms can move, thereby driving the gear to rotate through the gear teeth, and because the rotation of the gear drives the connecting arms and the clamping arms on the other side to move relative to the housing. Therefore, the clamping arms on the other side can also move synchronously by only pulling the clamping arms on one side. An elastic member is provided on one of the clamping arms, one end of the elastic member is connected to the clamping arm, and the other end is connected to the central axis, so when the clamping arm on the side with the elastic member is pulled, the elastic member is stretched to produce elastic deformation, so that the clamping arm on this side has a tendency to move toward one side of the housing, so that the clamping arm has a clamping force, and can cooperate with the other clamping arm to stably clamp electronic devices such as mobile phones. In actual use, after the clamp arm with the elastic member is pulled, the connecting arm on this side moves relative to the housing, and the gear teeth on it drive the gear to rotate, and the rotation of the gear drives the connecting arm and clamp arm on the other side to move. At the same time, the elastic member can make one of the clamp arms have elastic force to clamp electronic devices such as mobile phones and cameras together with the clamp arm on the other side. Therefore, you only need to pull the clamp arm with the elastic member to make the clamp arms on both sides move synchronously relative to the housing. When applied to a neck-hanging bracket, the effect of the linkage movement of the clamp arms on both sides can also be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 is a schematic diagram of a clamping device provided in an embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the first half body, the transmission assembly and the clamping arm provided in an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of a transmission assembly and a clamping arm provided in an embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of a housing and a bracket provided in an embodiment of the utility model;

[0021] Figure 5 is a schematic diagram of a bracket provided in an embodiment of the utility model;

[0022] Figure 6It is a schematic diagram of a clamping arm and an elastic member provided in an embodiment of the utility model;

[0023] Figure 7 It is a schematic diagram of a connecting arm provided in an embodiment of the utility model;

[0024] Figure 8 It is a schematic diagram of the second half body, the clamping arm and the transmission assembly provided in the embodiment of the utility model;

[0025] Fig. 9 It is a schematic diagram of the positioning groove and the positioning protrusion provided in the embodiment of the utility model.

[0026] The reference numerals in the figures are:

[0027] 1000, clamping device; 100, housing; 101, accommodating space; 102, central axis; 103, slide rail; 104, through hole; 105, first half body; 1051, positioning groove; 106, second half body; 1061, limit platform; 1062, boss; 10621, sinking groove; 1063, spring ball; 200, clamping arm; 201, clamping part; 2011, positioning protrusion ; 202, connecting part; 2021, limiting ring; 2022, snap-fit ​​groove; 2023, fixed shaft; 300, elastic member; 400, transmission assembly; 401, gear; 402, connecting arm; 4021, gear teeth; 4022, buckle; 4023, first connecting section; 4024, second connecting section; 4025, abutting part; 500, bracket; 501, screw; 502, limiting groove. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0029] The present utility model embodiment provides a clamping device 1000, referring to Figure 1-3 As shown, the clamping device 1000 includes: a shell 100, two clamping arms 200, and a transmission assembly 400. The shell 100 has a accommodating space 101, and the shell 100 is provided with a central axis 102 and a slide rail 103; the two clamping arms 200 are respectively arranged on opposite sides of the shell 100, wherein one of the clamping arms 200 is provided with an elastic member 300, one end of the elastic member 300 is arranged in the clamping arm 200, and the other end is connected to the central axis 102; the transmission assembly 400 includes a gear 401 and two connecting arms 402, the gear 401 is rotatably sleeved on the central axis 102, the two connecting arms 402 are respectively arranged on opposite sides of the gear 401, the connecting arms 402 are provided with gear teeth 4021 for meshing with the gear 401, the connecting arms 402 are rotatably connected to the clamping arms 200, and the connecting arms 402 are slidably connected to the slide rail 103.

[0030] A central axis 102 and a slide rail 103 are provided in the housing 100. The connecting arm 402 in the transmission assembly 400 is arranged in the slide rail 103 and can slide relative to the housing 100 through the slide rail 103. A gear 401 is sleeved on the central axis 102, and the gear 401 can rotate relative to the central axis 102. Connecting arms 402 are provided on both sides of the central axis 102, and gear teeth 4021 are provided on the connecting arms 402 to cooperate with the gear 401. The connecting arms 402 are connected to the clamping arms 200. Therefore, when the clamping arms 200 on one side move relative to the housing 100, the connecting arms 402 can move, thereby driving the gear 401 to rotate through the gear teeth 4021, and because the rotation of the gear 401 drives the connecting arm 402 and the clamping arm 200 on the other side to move relative to the housing 100. Therefore, the clamping arms 200 on the other side can be moved synchronously by only pulling the clamping arms 200 on one side. An elastic member 300 is provided on one of the clamp arms 200, one end of the elastic member 300 is connected to the clamp arm 200, and the other end is connected to the central axis 102, so when the clamp arm 200 on one side with the elastic member 300 is pulled, the elastic member 300 is stretched to produce elastic deformation, so that the clamp arm 200 on this side has a tendency to move toward the side of the housing 100, so that the clamp arm 200 has a clamping force, and can cooperate with the other clamp arm 200 to stably clamp electronic devices such as mobile phones. In actual use, after the clamp arm 200 on one side with the elastic member 300 is pulled, the connecting arm 402 on this side moves relative to the housing 100, and the gear 4021 on it drives the gear 401 to rotate, and the rotation of the gear 401 drives the connecting arm 402 and the clamp arm 200 on the other side to move. At the same time, the elastic member 300 can make one of the clamp arms 200 have elastic force to clamp electronic devices such as mobile phone cameras together with the clamp arm 200 on the other side. Therefore, the clamping arms 200 on both sides can be synchronously moved relative to the housing 100 by only pulling the clamping arm 200 on the side provided with the elastic member 300. When applied to a neck-hanging bracket, the clamping arms 200 on both sides can also achieve the effect of linkage movement. In actual use, the user can use the clamping device 1000 to clamp electronic devices such as mobile phones or cameras more conveniently and quickly, and the elastic force of the elastic member 300 can ensure firm and stable clamping.

[0031] Specifically, the design of the gear 401 and the connecting arm 402 in the transmission assembly 400 enables the clamping device 1000 to have high operational flexibility. The design of the gear 401 in the transmission assembly 400 can effectively transmit force and movement, ensure the synchronous movement of the two clamping arms 200, and thus realize the normal operation of the clamping device 1000. Pulling one of the clamping arms 200 can transmit force to the other clamping arm 200 through the transmission assembly 400, realize the opening and closing clamping action of the clamping device 1000, and at the same time make the clamping device 1000 more stable during operation.

[0032] Specifically, the presence of the elastic member 300 can provide a certain elastic force for the clamp arm 200. On the one hand, when the clamping device 1000 is not used for clamping, the clamp arm 200 can be automatically reset and retracted through the deformation of the elastic member 300. On the other hand, the clamp arm 200 obtains the clamping force for clamping objects such as mobile phones through the tendency of the elastic member 300 to restore elastic deformation, so that the clamping device 1000 clamps the object more firmly and stably, avoiding the shaking or displacement of the clamp arm 200 caused by external influences, which may cause the mobile phone to fall and be damaged.

[0033] Specifically, a slide rail 103 is provided in the shell 100, and the connecting arm 402 is slidably connected to the slide rail 103. The sliding process of the connecting arm 402 relative to the slide rail 103 is smoother, which reduces the friction resistance between the connecting arm 402 and the shell 100 and improves the use efficiency of the clamping device 1000.

[0034] It should be noted that, in actual use, the clamp arm 200 on the side with the elastic member 300 should be pulled to drive the clamp arm 200 on the other side to keep synchronous movement with it. If the clamp arm 200 on the side without the elastic member 300 is pulled, there will be a conflict between the force transmitted by the transmission assembly 400 and the elastic force of the elastic member 300 on the other side, which may cause damage to the clamping device 1000.

[0035] refer to Figure 2 , Figure 6 and Figure 8 The clamping arm 200 includes a clamping portion 201 and a connecting portion 202 connected to each other. A through hole 104 is provided on the shell 100. The connecting portion 202 passes through the through hole 104 and is connected to the clamping portion 201. The connecting portion 202 is a hollow structure, and the elastic member 300 is accommodated in the connecting portion 202.

[0036] The clamping arm 200 includes a clamping portion 201 and a connecting portion 202, and the connecting portion 202 passes through the through hole 104 on the housing 100 and is connected to the clamping portion 201. The clamping portion 201 is used to directly contact with an electronic device such as a mobile phone camera, and is used to apply elastic force to fix the electronic device on the clamping device 1000. The connecting portion 202 is arranged in the housing 100, and is used to connect with the connecting arm 402 in the transmission assembly 400, so as to facilitate the force of the clamping arm 200 on one side provided with the elastic member 300 to be transmitted to the clamping arm 200 on the other side through the transmission assembly 400, so as to ensure that the clamping arms 200 on both sides can move synchronously.

[0037] Specifically, the connecting portion 202 is a hollow structure, so the elastic member 300 is disposed inside the connecting portion 202. Hiding the elastic member 300 inside the connecting portion 202 can make the overall structure of the clamp arm 200 more compact, reduce the space occupied by the elastic member 300, and reduce the overall structural size, so that the clamping device 1000 is easy to carry and use.

[0038] refer to Figure 2 and Figure 7 Two adjacent limiting rings 2021 are provided on the connecting portion 202 , a snap-fitting groove 2022 is formed between the two limiting rings 2021 , a buckle 4022 is provided on the connecting arm 402 , and the buckle 4022 is snap-fitted and connected with the snap-fitting groove 2022 .

[0039] A snap-fit ​​groove 2022 is formed between two adjacent limiting rings 2021, and the snap-fit ​​groove 2022 is used to snap-fit ​​and connect with the buckle 4022 on the connecting arm 402. The two adjacent connecting rings can provide a precise positioning function for the buckle 4022, ensure the position between the connecting portion 202 and the connecting arm 402 is accurate, and prevent the connecting portion 202 and the connecting arm 402 from being misaligned or offset during operation, thereby ensuring the normal operation and stability of the clamping device 1000.

[0040] Specifically, the buckle 4022 is snap-connected with the snap-in groove 2022 . This connection method can ensure that the connection between the connecting part 202 and the connecting arm 402 is firm and reliable, prevent the buckle 4022 and the connecting part 202 from loosening or falling off during operation, and improve the reliability of the clamping device 1000 .

[0041] On the other hand, the snap-fit ​​connection between the buckle 4022 and the snap-fit ​​groove 2022 makes the installation between the connecting part 202 and the connecting arm 402 easier and quicker, and the operator can easily connect the two together, saving time and labor costs.

[0042] refer to Figure 2 , Figure 4 and Figure 8The housing 100 includes a first half body 105 and a second half body 106 . The central axis 102 and the slide rail 103 are disposed on the first half body 105 . The second half body 106 is provided with a limiting platform 1061 for limiting the connection arm 402 .

[0043] A limit platform 1061 is provided on the second half body 106. The limit platform 1061 is set corresponding to the connecting arm 402 and can limit the connecting arm 402 during the movement of the connecting arm 402. It can limit the moving range of the connecting arm 402 and prevent the movement of the connecting arm 402 beyond the specified range, thereby improving the safety and stability of the clamping device 1000.

[0044] Specifically, the housing 100 is divided into a first half body 105 and a second half body 106 , which can facilitate the subsequent maintenance and repair of the clamping device 1000 . Operators can more conveniently perform inspection and maintenance work, thereby extending the service life of the clamping device 1000 .

[0045] Specifically, the setting of the limit platform 1061 can limit the movement position of the connecting arm 402, so that the movement range of the connecting arm 402 can be understood more intuitively, thereby better controlling the movement of the clamping device 1000 and improving the convenience and efficiency of operation.

[0046] refer to Figure 7 The connecting arm 402 includes a first connecting section 4023 and a second connecting section 4024 which are connected in sequence. The first connecting section 4023 and the second connecting section 4024 are in a Z-shaped structure. An abutting portion 4025 for abutting against the limit platform 1061 is formed between the first connecting section 4023 and the second connecting section 4024. The gear teeth 4021 are arranged on the second connecting section 4024.

[0047] The first connecting section 4023 and the second connecting section 4024 are in a Z-shaped structure, which can increase the structural strength and stability of the connecting arm 402 during movement, so that the clamping device 1000 can withstand greater force and pressure during operation, improve the service life of the connecting arm 402, and make the clamping device 1000 more solid and reliable during operation. The abutting portion 4025 formed between the first connecting section 4023 and the second connecting section 4024 can abut against the limiting platform 1061, play a limiting effect on the connecting arm 402, ensure that the connecting arm 402 is kept within a reasonable range of movement during movement, and improve the safety of the clamping device 1000.

[0048] Specifically, the second connecting section 4024 is provided with gear teeth 4021 that cooperate with the gear 401. The gear teeth 4021 are engaged with the gear 401, so that the connecting arm 402 can drive the gear 401 to rotate during the movement, thereby transmitting the movement of the clamping arm 200 on one side of the elastic member 300 to the clamping arm 200 on the other side, ensuring the synchronous movement of the clamping arms 200 on both sides.

[0049] refer to Figure 4 and Figure 5 The clamping device 1000 further includes a bracket 500 and a screw 501 . The screw 501 is mounted on the second half body 106 , and the bracket 500 is rotatably connected to the screw 501 .

[0050] The setting of the bracket 500 can provide a certain support force for the clamping device 1000, ensuring that the clamping device 1000 maintains balance and stability during clamping, and reducing shaking and vibration. The screw 501 is installed on the second half body 106, and the bracket 500 is rotatably connected to the screw 501, so that the bracket 500 can rotate relative to the second half body 106. The user can easily adjust the relative position of the bracket 500 and the housing 100, and can freely adjust according to the needs of the user, thereby improving the applicability and flexibility of the clamping device 1000.

[0051] It should be noted that the bracket 500 can support the clamping device 1000, or the bracket 500 can be used as an intermediate connecting member to connect other supporting members or connecting members.

[0052] refer to Figure 4 and Figure 5 A boss 1062 is provided on the outer surface of the second half body 106, and at least one sinking groove 10621 is provided in the boss 1062. A spring ball 1063 is provided in the sinking groove 10621. The spring ball 1063 protrudes from the sinking groove 10621 and is exposed. A plurality of limiting grooves 502 for cooperating with the spring ball 1063 are provided on one side of the bracket 500 facing the boss 1062.

[0053] At least one sinking groove 10621 is provided on the boss 1062, and the spring ball 1063 protrudes from the sinking groove 10621 and is exposed. The bracket 500 is provided with a plurality of limiting grooves 502 for cooperating with the spring ball 1063. In this way, when the bracket 500 rotates relative to the housing 100, the bracket 500 can be positioned by cooperating with the protruding spring ball 1063 and the limiting groove 502. The accurate positioning effect of the bracket 500 is achieved, ensuring that the clamping device 1000 can be positioned at certain special angles or positions, so that the clamping device 1000 can provide better shooting conditions, facilitate the user's operation, and meet the user's shooting needs.

[0054] Specifically, during the rotation of the bracket 500, the limiting groove 502 cooperates with the protruding spring ball 1063 as the bracket 500 rotates, which can increase the friction between the spring ball 1063 and the limiting groove 502, so as to achieve the limiting positioning of the clamping device 1000 at the required angle and range. The friction between the spring ball 1063 and the limiting groove 502 improves the stability between the bracket 500 and the housing 100, prevents movement or shaking during operation, and ensures the stability and safety of the clamping device 1000.

[0055] It should be noted that the side of the bracket 500 facing the boss 1062 is provided with a plurality of limiting grooves 502. This design allows the position of the bracket 500 to have a plurality of angles and positions that can be positioned, and can be adjusted relatively flexibly, and positioned according to specific needs, thereby increasing the flexibility and applicability of the clamping device 1000. In this embodiment, two sinking grooves 10621 are provided on the boss 1062, and four limiting grooves 502 are provided on the bracket 500 for cooperating with the protruding spring ball 1063. Of course, a sinking groove 10621 can also be provided on the boss 1062, and a spring ball 1063 is placed in the sinking groove 10621 for cooperating with the plurality of limiting grooves 502.

[0056] refer to Figure 1 and Fig. 9 The clamping portion 201 is a conformal structure of the outer contour of the housing 100 . A positioning protrusion 2011 is provided on the side of the clamping portion 201 facing the first half body 105 . A positioning groove 1051 cooperating with the positioning protrusion 2011 is provided on the first half body 105 .

[0057] The clamping portion 201 is a conformal structure of the outer contour of the shell 100, so when the clamping portion 201 is in a fully retracted state, it can fit with the shell 100, which not only brings visual consistency in appearance, but also makes the connection between the clamping portion 201 and the shell 100 tighter with less gap, making the structural size of the entire clamping device 1000 smaller and easier to carry and store.

[0058] A positioning protrusion 2011 is provided on the inner wall of the clamping part 201, which is used to cooperate with the positioning groove 1051 on the first half body 105. When the clamping arm 200 does not need to clamp electronic devices such as mobile phones or cameras, or when the clamping arm 200 returns to its original position, the positioning protrusion 2011 and the positioning groove 1051 can prevent the clamping arm 200 from rotating relative to the housing 100 at will, and the clamping part 201 can be limited and positioned to a certain extent, protecting the clamping arm 200 from rotating and shaking due to the influence of the external environment. When the clamping device 1000 is in use, the clamping arm 200 can be twisted to rotate relative to the connecting arm 402, that is, the clamping groove 2022 rotates relative to the buckle 4022; when the clamping device is stored, the positioning protrusion 2011 cooperates with the positioning groove 1051 to make the clamping device 1000 more stable.

[0059] refer to Figure 6 The clamp arm 200 is provided with a fixed shaft 2023 penetrating the clamp arm 200 , one end of the elastic member 300 is connected to the fixed shaft 2023 , and the other end is connected to the central shaft 102 .

[0060] The fixed shaft 2023 is connected to one end of the elastic member 300, and the fixed shaft 2023 passes through the clamp arm 200, ensuring the firmness and stability of the connection between the fixed shaft 2023 and the clamp arm 200, thereby avoiding the elastic member 300 from shaking and dislocating due to unstable connection during actual use.

[0061] Specifically, the elastic member 300 is arranged on the fixed shaft 2023, which facilitates the subsequent replacement and maintenance of the elastic member 300, and can be operated relatively easily, thereby reducing maintenance costs and time.

[0062] The embodiment of the utility model further provides a mobile phone holder 500, comprising a hanging rope and the clamping device 1000 in the above-mentioned embodiment, wherein the hanging rope is connected to the clamping device 1000.

[0063] The mobile phone holder 500 includes the same structure and beneficial effects as the clamping device 1000 in the aforementioned embodiment. The structure and beneficial effects of the clamping device 1000 have been described in detail in the aforementioned embodiment and will not be repeated here.

[0064] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present utility model.

Claims

1. A clamping device, characterized in that: include: A housing, wherein the housing has a containing space, and wherein a central axis and a slide rail are arranged in the housing; Two clamping arms, the two clamping arms are respectively arranged on opposite sides of the housing, one of the clamping arms is provided with an elastic member, one end of the elastic member is arranged in the clamping arm, and the other end is connected to the central axis; A transmission assembly, the transmission assembly includes a gear and two connecting arms, the gear is rotatably sleeved on the central axis, the two connecting arms are respectively arranged on opposite sides of the gear, the connecting arms are provided with gear teeth for meshing with the gear, the connecting arm is rotatably connected to the clamping arm, and the connecting arm is slidably connected to the slide rail.

2. The clamping device according to claim 1, characterized in that: The clamp arm comprises a clamping portion and a connecting portion which are connected to each other. A through hole is provided on the shell. The connecting portion passes through the through hole and is connected to the clamping portion. The connecting portion is a hollow structure. The elastic member is accommodated in the connecting portion.

3. The clamping device according to claim 2, characterized in that: The connecting portion is provided with two adjacent limiting rings, a clamping groove is formed between the two limiting rings, and the connecting arm is provided with a buckle, which is clamped and connected with the clamping groove.

4. The clamping device according to claim 2, characterized in that: The shell comprises a first half body and a second half body, the central axis and the slide rail are arranged on the first half body, and the second half body is provided with a limiting platform for limiting the position of the connecting arm.

5. The clamping device according to claim 4, characterized in that: The connecting arm includes a first connecting section and a second connecting section connected in sequence, the first connecting section and the second connecting section are in a Z-shaped structure, an abutting portion for abutting against the limit platform is formed between the first connecting section and the second connecting section, and the gear teeth are arranged on the second connecting section.

6. The clamping device according to claim 4, characterized in that: The clamping device also includes a bracket and a screw. The screw is mounted on the second half body, and the bracket is rotatably connected to the screw.

7. The clamping device according to claim 6, characterized in that: A boss is provided on the outer surface of the second half body, at least one sinking groove is provided in the boss, a spring ball is provided in the sinking groove, the spring ball protrudes from the sinking groove and is exposed, and a plurality of limiting grooves for cooperating with the spring ball are provided on one side of the bracket facing the boss.

8. The clamping device according to claim 4, characterized in that: The clamping portion is a conformal structure of the outer contour of the shell, a positioning protrusion is provided on the side of the clamping portion facing the first half body, and a positioning groove cooperating with the positioning protrusion is provided on the first half body.

9. The clamping device according to any one of claims 1 to 8, characterized in that: The clamp arm is provided with a fixed shaft penetrating the clamp arm, one end of the elastic member is connected to the fixed shaft, and the other end is connected to the central shaft.

10. A mobile phone holder, characterized in that: It comprises a hanging rope and the clamping device described in any one of claims 1 to 9 above, wherein the hanging rope is connected to the clamping device.

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