Locking device and holder

Abstract

The utility model relates to a locking device and a holder. The locking device comprises a first main body provided with a limiting groove; the second main body is rotationally connected with the first main body; the locking mechanism is arranged on the second main body, the locking device comprises a sliding unit, a locking unit and a first elastic unit, the sliding unit is slidably connected with the second main body between a locking position and an unlocking position in the first direction, when the sliding unit is located at the unlocking position, the locking unit is separated from the limiting groove, and when the sliding unit is located at the unlocking position, the locking unit is separated from the limiting groove; when the sliding unit is separated from the unlocking position and moves to the locking position, the first elastic unit pushes the locking unit to move in the first direction until the locking unit is matched with the limiting groove. Therefore, the number of parts of the locking mechanism is reduced, the locking mechanism is simple in structure and small in size, the structure of the whole locking device can be simplified, and miniaturization and lightweight design of the locking device can also be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of pan / tilt platforms, and in particular to a locking device and a pan / tilt platform including the locking device. Background Art

[0002] A gimbal can be used to support imaging devices such as smartphones and cameras, enabling them to capture both still and dynamic images. Multiple rotating components work together to achieve stabilization. During gimbal commissioning or storage, a locking device is required to limit and lock specific rotating components to prevent further rotation. However, traditional locking devices often suffer from structural complexity. Utility Model Content

[0003] A technical problem solved by the present application is how to simplify the structure of the locking device.

[0004] A locking device, comprising:

[0005] The first body is provided with a limit slot;

[0006] a second body, rotatably connected to the first body; and

[0007] The locking mechanism is arranged on the second main body, and the locking device includes a sliding unit, a locking unit and a first elastic unit. The sliding unit is slidably connected to the second main body between a locking position and an unlocking position along a first direction. When the sliding unit is in the unlocking position, the locking unit disengages from the limiting groove. When the sliding unit disengages from the unlocking position and moves to the locking position, the first elastic unit pushes the locking unit to move along the first direction until it cooperates with the limiting groove.

[0008] In one embodiment, the first body is a stator, and the second body is a rotor.

[0009] In one embodiment, the first elastic unit abuts between the second body and the locking unit, and when the sliding unit moves to the locking position, the first elastic unit pushes the locking unit and the sliding unit to move synchronously; when the sliding unit moves to the unlocking position, the sliding unit pushes the locking unit to move synchronously.

[0010] In one embodiment, the locking mechanism further includes a second elastic unit, one of the sliding unit and the second main body is provided with the second elastic unit and the other is provided with a positioning cavity; when in the unlocked position, the second elastic unit cooperates with the positioning cavity to fix the sliding unit in the unlocked position.

[0011] In one embodiment, at least one of the following options is also included:

[0012] The second elastic unit includes an elastic member and a positioning bead with a spherical surface, and the positioning bead cooperates with the positioning cavity;

[0013] The second elastic unit includes an elastic member having a protrusion, and the protrusion cooperates with the positioning cavity;

[0014] The directions of the elastic forces generated by the second elastic unit and the first elastic unit are perpendicular to each other.

[0015] In one embodiment, the sliding unit is provided with a receiving groove extending along the first direction, and the locking unit includes a locking member and an abutment member connected at an angle, the locking member is detachably received in the receiving groove and cooperates with the limiting groove, and the abutment member is located outside the receiving groove and abuts against the end face of the sliding unit away from the first body along the first direction.

[0016] In one embodiment, the second main body is provided with a sliding groove and an elongated hole that are interconnected, and the sliding unit includes a sliding member and a toggle member that are connected to each other, the sliding member slidingly cooperates with the sliding groove, the toggle member sliding cooperates with the elongated hole, and the toggle member includes a toggle head located outside the sliding groove and the elongated hole.

[0017] In one embodiment, the second main body includes a cylinder and a seat, the cylinder forms a receiving cavity, the seat is located in the receiving cavity and is provided with the slide groove, the slide groove is communicated with the receiving cavity, the elongated hole is provided on the cylinder, and the first main body covers the receiving cavity.

[0018] In one embodiment, at least one of the following options is also included:

[0019] The elastic force direction of the first elastic unit is the same as the extension direction of the rotation axis around which the first body rotates relative to the second body;

[0020] There are multiple limiting grooves, and the multiple limiting grooves are arranged at intervals along the circumference of the first body.

[0021] A pan / tilt head comprises any one of the locking devices described above.

[0022] A technical effect of one embodiment of the present application is that, since the sliding unit is slidably connected to the second body along a first direction between a locked position and an unlocked position, when the sliding unit is in the unlocked position, the locking unit disengages from the limiting groove, allowing relative rotation between the first body and the second body; when the sliding unit disengages from the unlocked position and moves to the locked position, the first elastic unit pushes the locking unit to move along the first direction until it engages with the limiting groove, preventing relative rotation between the first body and the second body. Therefore, the number of parts of the locking mechanism is reduced, making the locking mechanism simple in structure and small in size, thereby achieving a simplified structure of the entire locking device and a miniaturized and lightweight design of the locking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a locking device provided in one embodiment.

[0024] Figure 2 for Figure 1 The three-dimensional structural diagram of the locking device shown in another perspective.

[0025] Figure 3 for Figure 1 Schematic diagram of the exploded structure of the locking device shown.

[0026] Figure 4 for Figure 1 The illustrated schematic diagram is a three-dimensional sectional structural view of the locking device when the sliding unit is in the unlocked position.

[0027] Figure 5 for Figure 1 The illustrated schematic diagram is a three-dimensional sectional structural view of the locking device when the sliding unit is in the locking position.

[0028] Figure 6 for Figure 1 Schematic diagram of the partial exploded structure of the locking device shown.

[0029] Figure 7 for Figure 1 A schematic diagram of the partial three-dimensional structure of the first example locking mechanism in the locking device shown.

[0030] Figure 8 for Figure 1 A schematic diagram of the partially exploded structure of a second exemplary locking mechanism in the locking device shown.

[0031] Figure 9 for Figure 1 A schematic three-dimensional cross-sectional structural diagram of the locking mechanism in the locking device shown.

[0032] Figure markings: locking device 10, handle 20, unlocking position 11, locking position 12, first main body 100, limiting groove 110, second main body 200, cylinder 210, accommodating cavity 211, elongated hole 212, seat body 220, sliding groove 221, positioning cavity 222, locking mechanism 300, sliding unit 310, sliding member 311, receiving groove 3111, toggle member 312, toggle head 3121, locking unit 320, locking member 321, abutment member 322, first elastic unit 330, second elastic unit 340, positioning bead 341, protrusion 342. DETAILED DESCRIPTION

[0033] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0035] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0036] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0037] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0039] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 In one embodiment of the present application, a locking device 10 is provided, which includes a first body 100, a second body 200, and a locking mechanism 300. The first body 100 can be fixedly connected to the handle 20, and the second body 200 and the first body 100 can rotate relative to each other. The locking mechanism 300 is disposed on the second body 200. The first body 100 can be a stator, and a limiting slot 110 is defined in the first body 100. The second body 200 can be a rotor.

[0040] See Figure 4 、 Figure 5 and Figure 6The locking device 10 includes a sliding unit 310, a locking unit 320, and a first elastic unit 330. The sliding unit 310 is slidably connected to the second body 200 along a first direction, allowing the sliding unit 310 to move linearly between a locked position 12 and an unlocked position 11. The first elastic unit 330 abuts between the locking unit 320 and the second body 200. The locking unit 320 is disposed on the sliding unit 310. When the sliding unit 310 is in the unlocked position 11, the locking unit 320 disengages from the retaining groove 110, allowing the first body 100 and the second body 200 to rotate relative to each other. When the sliding unit 310 disengages from the unlocked position 11 and moves to the locked position 12, the first elastic unit 330 pushes the locking unit 320 along the first direction until it engages with the retaining groove 110, preventing relative rotation between the first body 100 and the second body 200. In other embodiments, the first body 100 may be a rotor, and the second body 200 may be a stator.

[0041] See Figure 4 、 Figure 5 and Figure 6 In some embodiments, the rotation axis about which the first body 100 and the second body 200 rotate relative to each other extends along the first direction. The first elastic unit 330 may be a spring, etc., and the elastic force direction of the first elastic unit 330 is the same as the first direction. The second body 200 is provided with a slide groove 221 and an elongated hole 212. For example, the elongated hole 212 may be a runway-shaped hole, etc. The slide groove 221 and the elongated hole 212 are interconnected. The sliding unit 310 includes a sliding member 311 and a toggle member 312. The sliding member 311 and the toggle member 312 are connected to each other. The toggle member 312 is protruding from the sliding member 311. The sliding member 311 and the slide groove 221 slide in cooperation along the first direction, and the toggle member 312 slides in cooperation with the elongated hole 212 along the first direction. The toggle member 312 includes a toggle head 3121 , the cross-sectional dimension of which is larger than the width of the elongated hole 212 , so that the toggle head 3121 is located outside the slide groove 221 and the elongated hole 212 , so that a user can contact the toggle head 3121 to drive the entire sliding unit 310 to slide relative to the slide groove 221 .

[0042] See Figure 4 、 Figure 5 and Figure 6The second body 200 includes a cylinder 210 and a base 220. The cylinder 210 defines a receiving chamber 211, which can be substantially cylindrical. The base 220 is located within the receiving chamber 211 and has a slide groove 221 formed therein. For example, the base 220 can be fixedly connected to the cylinder 210 via a detachable connection such as a bolt connection. The slide groove 221 communicates with the receiving chamber 211. An elongated hole 212 is formed in the cylinder 210. The first body 100 covers the receiving chamber 211. Obviously, the toggle head 3121 is located outside the receiving chamber 211, allowing a user to contact the toggle head 3121 to drive the sliding unit 310 to move.

[0043] See Figure 7 、 Figure 8 and Figure 9 In some embodiments, the sliding unit 310 defines a receiving groove 3111 extending along a first direction. For example, the receiving groove 3111 may be defined on the sliding member 311 of the sliding unit 310. The locking unit 320 includes a locking member 321 and an abutting member 322. The locking member 321 and the abutting member 322 are disposed at an angle, for example, at a 90° angle, such that the locking member 321 and the abutting member 322 are perpendicular to each other. The locking member 321 is detachably received in the receiving groove 3111, thereby enabling the locking unit 320 to form a detachable connection with the sliding unit 310. The receiving groove 3111 effectively limits the locking member 321. When the sliding unit 310 is in the locked position 12, the locking member 321 engages with the limiting groove 110. When the sliding unit 310 is in the unlocked position 11, the locking member 321 disengages from the limiting groove 110, releasing the engagement between the two. The abutment member 322 is located outside the receiving groove 3111 and abuts against the end face of the sliding unit 310 facing away from the first body 100 along the first direction. The first elastic member 330 abuts between the abutment member 322 and the second body 200.

[0044] See Figure 4 、 Figure 5 and Figure 6During the movement of the sliding member 311 from the unlocked position 11 to the locked position 12, the first elastic unit 330 releases energy, causing the first elastic unit 330 to push the entire locking unit 320 in the first direction via the abutment member 322. Since the abutment member 322 abuts the end surface of the sliding member 311, the abutment member 322 also pushes the sliding member 311 to produce synchronous movement in the first direction. In other words, the first elastic unit 330 pushes the entire sliding unit 310 and the locking unit 320 to produce synchronous movement in the first direction. When the locking member 321 extends into the limiting groove 110 and engages with the limiting groove 110, the locking member 321 will limit the second body 200 along its circumferential direction, effectively preventing the second body 200 from rotating relative to the first body 100. When a user applies force to the toggle head 3121 in the locked position 12, the sliding member 311 generates an abutting force on the abutting member 322, which in turn causes the sliding member 311 to push the abutting member 322 to generate synchronous movement along the first direction. This causes the entire sliding unit 310 and the locking unit 320 to generate synchronous movement along the first direction. The abutting member 322 compresses the first elastic member 330, causing the first elastic member 330 to store energy. This allows both the sliding unit 310 and the locking unit 320 to overcome the elastic force of the first elastic member 330 and move away from the locked position 12. When the sliding unit 310 moves to the unlocked position 11, the locking member 321 completely disengages from the limiting groove 110, thereby releasing the locking member 321 from limiting the second body 200 along its circumferential direction, ensuring that the second body 200 can rotate relative to the first body 100.

[0045] See Figure 6 、 Figure 7 and Figure 8In some embodiments, the locking mechanism 300 further includes a second elastic unit 340, and the elastic forces generated by the second elastic unit 340 and the first elastic unit 330 are perpendicular to each other. One of the sliding unit 310 and the second body 200 is provided with the second elastic unit 340, and the other is provided with a positioning cavity 222. For example, the second elastic unit 340 is provided on the sliding member 311 of the sliding unit 310, and the positioning cavity 222 can be provided on the base 220 of the second body 200; for another example, the second elastic unit 340 is provided on the base 220 of the second body 200, and the positioning cavity 222 can be provided on the sliding member 311 of the sliding unit 310. When in the unlocked position 11, the second elastic unit 340 cooperates with the positioning cavity 222. Through the cooperation force and frictional resistance between the second elastic unit 340 and the positioning cavity 222, the sliding unit 310 can be effectively fixed in the unlocked position 11, effectively preventing the sliding unit 310 from leaving the unlocked position 11. Of course, when the user applies a force to the toggle head 3121, the force on the toggle head 3121 can effectively overcome the mating force and frictional resistance between the second elastic unit 340 and the positioning cavity 222, thereby disengaging the second elastic unit 340 from the positioning cavity 222, and then allowing the sliding unit 310 to move from the unlocked position 11 to the locked position 12. It is understood that after the user applies a force to the toggle head 3121 to disengage the second elastic unit 340 from the positioning cavity 222, the force applied to the toggle head 3121 can be removed, and under the action of the first elastic unit 330, the sliding unit 310 can be moved to the locked position 12, thereby allowing the locking member 321 to engage with the limiting groove 110. Therefore, when the sliding unit 310 moves from the unlocking position 11 to the locking position 12, it is only necessary to apply a force to the toggle head 3121 at the initial moment. When the second elastic unit 340 is disengaged from the positioning cavity 222, there is no need to continue to apply a force to the toggle head 3121. The sliding unit 310 can be effectively pushed from the unlocking position 11 to the locking position 12 only by the elastic force of the first elastic unit 330.

[0046] During the process of moving the sliding unit 310 from the locked position 12 to the unlocked position 11, since the elastic force of the first elastic unit 330 needs to be overcome, it is necessary to continuously apply force to the toggle head 3121 until the second elastic unit 340 engages with the positioning cavity 222, and the sliding unit 310 reaches the unlocked position 11. Since the second elastic unit 340 engages with the positioning cavity 222, the sliding unit 310 can be effectively fixed in the unlocked position 11. It will be understood that when the sliding unit 310 is locked in the locked position 12, although the first elastic unit 330 stores energy and generates a propulsive force on the sliding unit 310, the elastic force of the first elastic unit 330 is insufficient to overcome the mating force and frictional resistance between the second elastic unit 340 and the positioning cavity 222, resulting in the first elastic unit 330 being unable to push the sliding unit 310 out of the unlocked position 11. Therefore, a sufficiently large force must be applied by the user to push the sliding unit 310 out of the unlocked position 11.

[0047] See Figure 7 In some embodiments, for example, the second elastic unit 340 includes an elastic member and a positioning bead 341. The positioning bead 341 has a spherical surface, so that the positioning bead 341 can be spherical. The elastic member can be a spring, and the elastic member abuts between the sliding member 311 and the positioning bead 341. When the sliding member 311 moves to the unlocked position 11, the positioning bead 341 will correspond to the positioning cavity 222, and the elastic member will push the positioning bead 341 to be embedded in the positioning cavity 222, so that the positioning bead 341 and the positioning cavity 222 cooperate with each other. When a certain force is applied to the sliding member 311 by the toggle head 3121, the positioning bead 341 can overcome the elastic force of the elastic member and disengage from the positioning cavity 222, thereby allowing the sliding unit 310 to move from the unlocked position 11 to the locked position 12.

[0048] See Figure 8 For another example, the elastic member can be a sheet-like spring, which is fixedly connected to the sliding member 311. The spring is provided with a protrusion 342, which cooperates with the positioning cavity 222. When the sliding member 311 moves to the unlocked position 11, the protrusion 342 will correspond with the positioning cavity 222. Under the action of the elastic force of the elastic member, the protrusion 342 and the positioning cavity 222 cooperate with each other. When a certain force is applied to the sliding member 311 by the toggle head 3121, the protrusion 342 can overcome the elastic force of the elastic member and disengage from the positioning cavity 222, thereby allowing the sliding unit 310 to move from the unlocked position 11 to the locked position 12.

[0049] The working principle of the locking device 10 is described below:

[0050] When the sliding unit 310 is in the locked position 12 and the first body 100 and the second body 200 need to rotate relative to each other, the user can apply a force to the toggle head 3121, causing the sliding unit 310 and the locking unit 320 to overcome the elasticity of the first elastic unit 330 and move toward the unlocked position 11. The first elastic unit 330 will then store energy. By continuing to apply the force to the toggle head 3121, when the sliding unit 310 and the locking unit 320 move synchronously to the unlocked position 11, the second elastic unit 340 will engage with the positioning cavity 222. At this point, the force applied to the toggle head 3121 can be removed, and the second elastic unit 340 will cause the sliding unit 310 to remain in the unlocked position 11. Obviously, when the sliding unit 310 stays in the unlocking position 11, the locking member 321 of the locking unit 320 will disengage from the limiting groove 110, thereby releasing the circumferential limiting effect of the locking member 321 on the second body 200, so that the second body 200 can rotate relative to the first body 100.

[0051] When the sliding unit 310 is in the unlocked position 11, if it is desired to stop the first body 100 and the second body 200 from rotating relative to each other, the user can apply force to the toggle head 3121, causing the second elastic unit 340 to disengage from the positioning cavity 222, thereby releasing the engagement between the second elastic unit 340 and the positioning cavity 222. The first elastic unit 330 releases energy, and the elastic force generated by the first elastic unit 330 can be used to remove the force applied to the toggle head 3121. The elastic force generated by the first elastic unit 330 alone can then propel the sliding unit 310 toward the locked position 12. When the sliding unit 310 moves to the locked position 12, the locking member 321 engages with the limiting groove 110, causing the locking member 321 to circumferentially limit the second body 200, thereby effectively preventing the second body 200 from rotating relative to the first body 100.

[0052] In some embodiments, there are multiple limiting grooves 110, and the multiple limiting grooves 110 are arranged at intervals along the circumference of the first body 100. Given the multiple limiting grooves 110, the second body 200 can be locked in a preset position. It can be understood that when the first elastic unit 330 pushes the sliding unit 310 to move toward the locking position 12, when the locking member 321 abuts against the first body 100 but is not aligned with the limiting groove 110 in the first direction, the second body 200 can be slowly rotated relative to the first body 100 by a certain angle. At the moment when the locking member 321 and the limiting groove 110 are aligned, the sliding unit 310 and the locking member 321 will produce a "stepping-in-the-air" effect and quickly move to the locking position 12, so that the locking member 321 and the limiting groove 110 are effectively matched.

[0053] Therefore, since the sliding unit 310 is slidably connected to the second body 200 along the first direction between the locked position 12 and the unlocked position 11, when the sliding unit 310 is in the unlocked position 11, the locking unit 320 disengages the limiting groove 110, allowing relative rotation between the first body 100 and the second body 200; when the sliding unit 310 disengages the unlocked position 11 and moves to the locked position 12, the first elastic unit 330 pushes the locking unit 320 along the first direction until it engages with the limiting groove 110, preventing relative rotation between the first body 100 and the second body 200. Therefore, the number of components of the locking mechanism 300 is reduced, making the locking mechanism 300 simple in structure and compact in size. This can simplify the structure of the entire locking device 10 and also achieve a miniaturized and lightweight design of the locking device 10.

[0054] In some embodiments, the present application further provides a gimbal, which includes the locking device 10. Since the gimbal includes the locking device 10, the structure of the gimbal can be simplified, thereby achieving a miniaturized and lightweight design of the gimbal.

[0055] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A locking device, characterized in that: include: The first body is provided with a limit slot; a second body, rotatably connected to the first body; and The locking mechanism is arranged on the second main body, and the locking device includes a sliding unit, a locking unit and a first elastic unit. The sliding unit is slidably connected to the second main body between a locking position and an unlocking position along a first direction. When the sliding unit is in the unlocking position, the locking unit disengages from the limiting groove. When the sliding unit disengages from the unlocking position and moves to the locking position, the first elastic unit pushes the locking unit to move along the first direction until it cooperates with the limiting groove.

2. The locking device according to claim 1, characterized in that: The first body is a stator, and the second body is a rotor.

3. The locking device according to claim 1, characterized in that: The first elastic unit abuts between the second body and the locking unit. When the sliding unit moves to the locking position, the first elastic unit pushes the locking unit and the sliding unit to move synchronously. When the sliding unit moves to the unlocking position, the sliding unit pushes the locking unit to move synchronously.

4. The locking device according to claim 1, characterized in that: The locking mechanism also includes a second elastic unit, one of the sliding unit and the second main body is provided with the second elastic unit and the other is provided with a positioning cavity; when in the unlocked position, the second elastic unit cooperates with the positioning cavity to fix the sliding unit in the unlocked position.

5. The locking device according to claim 4, characterized in that: Also includes at least one of the following options: The second elastic unit includes an elastic member and a positioning bead with a spherical surface, and the positioning bead cooperates with the positioning cavity; The second elastic unit includes an elastic member having a protrusion, and the protrusion cooperates with the positioning cavity; The directions of the elastic forces generated by the second elastic unit and the first elastic unit are perpendicular to each other.

6. The locking device according to any one of claims 1 to 5, characterized in that: The sliding unit is provided with a receiving groove extending along the first direction, and the locking unit includes a locking member and an abutment member connected at an angle, the locking member is detachably received in the receiving groove and cooperates with the limiting groove, and the abutment member is located outside the receiving groove and abuts against the end face of the sliding unit away from the first main body along the first direction.

7. The locking device according to claim 1, characterized in that: The second main body is provided with a sliding groove and an elongated hole that are interconnected. The sliding unit includes a sliding member and a toggle member that are connected to each other. The sliding member slides in cooperation with the sliding groove, and the toggle member slides in cooperation with the elongated hole. The toggle member includes a toggle head located outside the sliding groove and the elongated hole.

8. The locking device according to claim 7, characterized in that: The second main body includes a cylinder and a seat, the cylinder forms a receiving cavity, the seat is located in the receiving cavity and is provided with the slide groove, the slide groove is communicated with the receiving cavity, the elongated hole is provided on the cylinder, and the first main body covers the receiving cavity.

9. The locking device according to claim 1, characterized in that: Also includes at least one of the following options: The elastic force direction of the first elastic unit is the same as the extension direction of the rotation axis around which the first body rotates relative to the second body; There are multiple limiting grooves, and the multiple limiting grooves are arranged at intervals along the circumference of the first body.

10. A pan / tilt head, characterized in that: The invention comprises the locking device according to any one of claims 1 to 9.

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