Underwater liftable / lowerable waterproof laser device

Abstract

The present utility model relates to the field of laser devices. Disclosed is an underwater liftable / lowerable waterproof laser device, comprising a lifting / lowering platform and a laser light. The underwater liftable / lowerable waterproof laser device further comprises an adjusting mechanism, and the laser light is rotatably connected to the lifting / lowering platform by means of the adjusting mechanism; the adjusting structure is capable of driving the laser light to rotate around a first axis, and the adjusting structure is capable of driving the laser light to rotate around a second axis, wherein the first axis intersects with the second axis, the direction of the first axis is consistent with the lifting / lowering direction of the lifting / lowering platform, and the rotating angle of the laser light around the second axis is smaller than the rotating angle of the laser light around the first axis. The present utility model has the advantages of simple installation and operation and multi-angle adjustment.

Description

A type of underwater lifting waterproof laser device Technical Field

[0001] This utility model relates to the field of laser equipment technology, specifically to a water-lifting waterproof laser device. Background Technology

[0002] In recent years, with the widespread application of laser technology, the requirements for the practicality and precision of laser equipment have been increasing. For example, in stage setup, the accuracy and stability of the laser light installation position and angle adjustment play a decisive role in the final stage presentation. Currently, laser light angle adjustment mostly uses motor drive, which, while highly automated, carries the risk of adjustment failure due to motor malfunction and increases equipment costs. Therefore, developing a laser device with a simple structure, convenient adjustment, and low cost has become an urgent technical problem to be solved. Utility Model Content

[0003] This utility model aims to solve one of the technical problems in related technologies to a certain extent. To this end, this utility model provides a water-lifting waterproof laser device, which has the advantages of simple installation and operation, and multi-angle adjustment.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A submersible lifting waterproof laser device includes a lifting platform and a laser lamp. The device also includes an adjustment mechanism, and the laser lamp is rotatably connected to the lifting platform via the adjustment mechanism. The adjustment mechanism can drive the laser lamp to rotate around a first axis and a second axis. The first axis and the second axis intersect, and the direction of the first axis is consistent with the lifting direction of the lifting platform. The angle of rotation of the laser lamp around the second axis is smaller than the angle of rotation around the first axis.

[0006] Optionally, the adjustment mechanism includes a first connector and a second connector, the first connector being rotatably connected to the top of the lifting platform, and the second connector being connected between the first connector and the laser lamp;

[0007] The first connector is rotatable relative to the lifting platform to drive the second connector and the laser lamp to rotate around the first axis; the second connector is rotatable relative to the first connector to drive the laser lamp to rotate around the second axis.

[0008] Optionally, the first connector includes a first base plate and two first side plates, with the first base plate connected between the two first side plates; the second connector includes a second base plate and two second side plates, with the second base plate connected between the two second side plates, and the second base plate is connected to the laser light.

[0009] The first base plate is rotatably connected to the top of the lifting platform so that the laser lamp can rotate around the second axis, the direction of the second axis being consistent with the thickness direction of the first base plate;

[0010] The two second side plates are rotatably connected to the corresponding first side plates, so that the laser lamp can rotate around the first axis, the direction of the first axis being consistent with the thickness direction of the second side plates.

[0011] Optionally, the adjustment mechanism further includes a first positioning member and a second positioning member. The first base plate has a first adjustment hole, the first positioning member is disposed on the top of the lifting platform, and the first positioning member passes through the first adjustment hole. The two first side plates each have a second adjustment hole, and the two second side plates are each provided with a second positioning member, the second positioning member passing through the corresponding second adjustment hole.

[0012] The first positioning member engages with the first adjustment hole, and the second positioning member engages with the second adjustment hole, to limit the rotational degrees of freedom of the laser lamp.

[0013] Optionally, the first positioning component includes a first positioning rod and a first fastener. The first positioning rod is disposed on the top of the lifting platform and passes through the first adjustment hole. The first fastener is threadedly connected to the first positioning rod. The second positioning component includes a second positioning rod and a second fastener. Both second side plates are provided with second positioning rods. The second positioning rods pass through the corresponding second adjustment holes. The second fastener is threadedly connected to the corresponding second positioning rod.

[0014] The first base plate can be fixed to the top of the lifting platform by the first fastener and the first positioning rod, and the second side plate can be fixed to the corresponding first side plate by the second fastener and the second positioning rod.

[0015] Optionally, the opening of the first adjustment hole is annular, and the opening of the second adjustment hole is arc-shaped.

[0016] Optionally, the lifting platform includes a base, a support plate, and a scissor-type telescopic frame connected between the base and the support plate, and the adjustment mechanism is disposed on the support plate.

[0017] Optionally, the scissor-type telescopic frame includes two support members and a connecting rod connecting the two support members. The two sides of the support members are connected to the base and the support plate. The two support members are stacked and spaced apart along the length direction of the base. The support members have a folded state and an unfolded state. When the support member switches from the folded state to the unfolded state, the support plate moves away from the base.

[0018] Optionally, the underwater lifting waterproof laser device further includes a motor, which is mounted on the base and connected to the linkage rod; the motor is used to drive the linkage rod so that the support plate moves away from the base or moves closer to the base.

[0019] Optionally, the lifting platform further includes two first limiting members and two second limiting members. The two first limiting members are all disposed on the side of the support plate facing the base, and the two first limiting members are disposed opposite to each other. The two second limiting members are all disposed on the side of the base facing the support plate, and the two first limiting members are disposed opposite to each other. The first limiting members have a first limiting hole, and the second limiting members have a second limiting hole.

[0020] The support member includes a first connecting part, a second connecting part, a third connecting part, and a fourth connecting part. The first connecting part is hinged to the support plate, and the second connecting part is movably disposed in the corresponding first limiting hole. The third connecting part is hinged to the base, and the fourth connecting part is movably disposed in the corresponding second limiting hole.

[0021] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] Figure 1 is a structural schematic diagram of an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of the adjustment structure in the above embodiment (enlarged view of point A in Figure 1).

[0025] Among them, 10 is a laser light; 12 is an adjustment mechanism; 121 is a first connecting piece; 1211 is a first base plate; 1211a is a first adjustment hole; 1212 is a first side plate; 1212a is a second adjustment hole; 1213 is a first positioning piece; 122 is a second connecting piece; 1221 is a second base plate; 1222 is a second side plate; 1223 is a second positioning piece; 11 is a lifting platform; 111 is a scissor-type telescopic frame; 1111 is a support piece; 1112 is a connecting rod; 1113 is a first connecting part; 1114 is a second connecting part; 1115 is a third connecting part; 1116 is a fourth connecting part; 112 is a support plate; 113 is a base; 114 is a first limiting piece; 114a is a first limiting hole; 115 is a second limiting piece; 115a is a second limiting hole; and 13 is a motor. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0027] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this patent. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0028] This embodiment provides an underwater lifting waterproof laser device, as shown in Figures 1 and 2, including a lifting platform 11 and a laser lamp 10. The underwater lifting waterproof laser device also includes an adjustment mechanism 12. The laser lamp 10 is rotatably connected to the lifting platform 11 through the adjustment mechanism 12. The adjustment mechanism can drive the laser lamp 10 to rotate around a first axis and can also drive the laser lamp 10 to rotate around a second axis. The first axis and the second axis intersect. The length direction of the first axis is consistent with the lifting direction of the lifting platform 11. The angle of rotation of the laser lamp 10 around the second axis is smaller than the angle of rotation around the first axis.

[0029] By setting up a lifting platform 11, the working height of the laser lamp 10 can be adjusted as needed. An adjustment mechanism 12 is provided between the laser lamp 10 and the lifting platform 11, wherein the adjustment mechanism 12 is rotatably connected to the laser lamp 10 and also rotatably connected to the top of the lifting platform 11. It is understood that the adjustment mechanism 12 has a fixed state, meaning that the adjustment mechanism 12 and the laser lamp 10 are relatively fixed, and the laser lamp 10 and the lifting platform 11 are relatively fixed, thus ensuring stable laser beam output during use. In a non-fixed state, driven by the adjustment mechanism 12, the laser lamp 10 can rotate with multiple degrees of freedom relative to the lifting platform 11, thereby adjusting the irradiation direction or angle of the laser beam, achieving precise adjustment of the laser beam to adapt to different working needs. This utility model's underwater lifting waterproof laser device, through the coordinated action of the lifting platform 11, the laser lamp 10, and the adjustment mechanism 12, achieves flexible adjustment of the height, direction, and angle of the laser beam, thereby improving the applicability of the laser equipment.

[0030] It should be noted that the maximum rotation angle of the laser lamp 10 around the first axis is 360°, thus ensuring the projection adjustment range of the laser lamp 10. Since the emitting surface of the laser lamp 10 does not need to face the lifting platform 11, the rotation angle of the laser lamp 10 around the second axis is less than 360°, that is, the rotation angle of the laser lamp 10 around the second axis is less than the rotation angle around the first axis.

[0031] It is understood that the aforementioned laser equipment can be used both on land and underwater. To enable underwater operation, the housings of the laser lamp 10 and the motor 13 in this embodiment can be waterproof, thereby improving the equipment's sealing and preventing water from entering the laser lamp 10 and motor 13 during underwater operation. The waterproof housing meets IP68 standards. Similarly, the adjustment mechanism 12 and the lifting platform 11 in this embodiment can be made of stainless steel to prevent rusting caused by prolonged underwater operation.

[0032] Preferably, the first axis and the second axis are perpendicular to each other, thereby improving the stability of the connection between the adjustment mechanism and the laser lamp. It should be understood that the intersection of the first axis and the second axis means that the first axis and the second axis are not parallel.

[0033] In this embodiment, the specific structure of the adjustment mechanism 12 is not specifically limited, as long as the adjustment mechanism 12 can drive the laser lamp 10 to rotate with multiple degrees of freedom relative to the lifting platform 11. Optionally, the adjustment mechanism 12 includes a first connecting member 121 and a second connecting member 122. The first connecting member 121 is rotatably connected to the top of the lifting platform 11, and the second connecting member 122 is connected between the first connecting member 121 and the laser lamp 10.

[0034] The first connector 121 can rotate relative to the lifting platform 11 to drive the second connector 122 and the laser lamp 10 to rotate around the first axis; the second connector 122 can rotate relative to the first connector 121 to drive the laser lamp 10 to rotate around the second axis.

[0035] Through the cooperation of the first connector 121 and the second connector 122, the laser light 10 can rotate around a first axis and a second axis, i.e., multi-degree-of-freedom rotation, thereby increasing the adjustment range of the laser light 10. This allows the laser beam of the laser light 10 to be projected onto any area of ​​the stage without moving the underwater lifting waterproof laser equipment. Furthermore, the first connector 121 and the second connector 122 are simple parts, easy to install and use. Users can adjust the position and angle of the laser light 10 by adjusting the first connector 121 and the second connector 122.

[0036] Optionally, the first connector 121 includes a first base plate 1211 and two first side plates 1212, with the first base plate 1211 connected between the two first side plates 1212; the second connector 122 includes a second base plate 1221 and two second side plates 1222, with the second base plate 1221 connected between the two second side plates 1222, and the second base plate 1221 is connected to the laser lamp 10.

[0037] The first base plate 1211 is rotatably connected to the top of the lifting platform 11 so that the laser lamp 10 can rotate around the second axis, the direction of which is consistent with the thickness direction of the first base plate 1211.

[0038] The two second side plates 1222 are rotatably connected to the corresponding first side plates 1212, so that the laser lamp 10 can rotate around the first axis, the direction of the first axis being consistent with the thickness direction of the second side plate 1222.

[0039] The first base plate 1211 and the two first side plates 1212 are connected to form a U-shaped first connector 121, and the second base plate 1221 and the two second side plates 1222 are connected to form a U-shaped second connector 122. The U-shaped structural design provides good stability and load-bearing capacity for both the first connector 121 and the second connector 122, ensuring stable operation of the laser lamp 10 after installation and reducing problems caused by shaking or vibration. Furthermore, the first connector 121 (composed of the first base plate 1211 and the two first side plates 1212) and the second connector 122 (composed of the second base plate 1221 and the two second side plates 1222) are simple in structure and easy to operate; simply rotating either the first connector 121 or the second connector 122 adjusts the projection angle of the laser lamp 10.

[0040] In one optional embodiment, the adjustment mechanism 12 further includes a first positioning member 1213 and a second positioning member 1223. The first base plate 1211 has a first adjustment hole 1211a. The first positioning member 1213 is disposed on the top of the lifting platform 11 and passes through the first adjustment hole 1211a. The two first side plates 1212 each have a second adjustment hole 1212a. The two second side plates 1222 are each provided with a second positioning member 1223, which passes through the corresponding second adjustment hole 1212a.

[0041] The first positioning member 1213 cooperates with the first adjustment hole 1211a, and the second positioning member 1223 cooperates with the second adjustment hole 1212a to limit the rotational degrees of freedom of the laser lamp 10.

[0042] By passing the first positioning member 1213 through the first adjustment hole 1211a of the first base plate 1211, the rotation of the first connecting member 121 around the first axis is restricted. Similarly, by passing the second positioning member 1223 through the second adjustment hole 1212a of the first side plate 1212, the rotation of the second connecting member 122 around the first axis is restricted. It should be noted that the hinge point between the first positioning member 1213 and the lifting platform 11 is located at a different position than the first adjustment hole 1211a, and the axial direction of this hinge point is coaxial with the first axis. Likewise, the axial direction of the hinge point between the second positioning member 1223 and the first positioning member 1213 is coaxial with the second axis.

[0043] In one specific embodiment, the first positioning member 1213 includes a first positioning rod (not shown in the figure) and a first fastener (not shown in the figure). The first positioning rod is disposed on the top of the lifting platform 11 and passes through the first adjustment hole 1211a. The first fastener is threadedly connected to the first positioning rod. The second positioning member 1223 includes a second positioning rod and a second fastener. Both second side plates 1222 are provided with second positioning rods. The second positioning rods pass through the corresponding second adjustment holes 1212a. The second fasteners are threadedly connected to the corresponding second positioning rods.

[0044] The first base plate 1211 can be fixed to the top of the lifting platform 11 by the first fastener and the first positioning rod, and the second side plate 1222 can be fixed to the corresponding first side plate 1212 by the second fastener and the second positioning rod.

[0045] After the first positioning rod passes through the first adjustment hole 1211a, the first fastener is fitted onto the first positioning rod, and the first base plate 1211 is fixed to the top of the lifting platform 11 through the threaded connection between the first fastener and the first positioning rod. Similarly, the second side plate 1222 is fixed to the corresponding first side plate 1212 through the threaded connection between the second positioning rod and the second fastener. When it is necessary to adjust the angle of the laser lamp 10, the first fastener is turned in the opposite direction to move it away from the top of the lifting platform 11, thereby releasing the restriction of the first fastener on the first base plate 1211 and allowing the laser lamp 10 to rotate around the first axis. The second fastener is turned in the opposite direction to move it away from the first side plate 1212, thereby releasing the restriction of the second fastener on the second side plate 1222 and allowing the laser lamp 10 to rotate around the second axis.

[0046] In this invention, the specific method for achieving more than 10 angle adjustments of the laser light is not specifically limited. For example, multiple first adjustment holes 1211a can be opened in the first base plate 1211, and multiple second adjustment holes 1212a can be opened in the second base plate 1221. As needed for the required adjustment angle, the first positioning member 1213 is inserted into the corresponding first adjustment hole 1211a, and the second positioning member 1223 is inserted into the corresponding second adjustment hole 1212a. Preferably, the opening of the first adjustment hole 1211a is annular, and the opening of the second adjustment hole 1212a is arc-shaped. The opening of the first adjustment hole 1211a coincides with the trajectory of the first positioning member 1213 rotating around the first axis, and the opening of the second adjustment hole 1212a coincides with the trajectory of the second positioning member 1223 rotating around the second axis.

[0047] Optionally, the lifting platform 11 includes a base 113, a support plate 112, and a scissor-type telescopic frame 111 connected between the base 113 and the support plate 112, with the adjustment mechanism 12 disposed on the support plate 112.

[0048] By setting a scissor-type telescopic frame 111 between the base 113 and the support plate 112, the support plate 112 can be moved repeatedly along its thickness direction, thereby realizing the adjustment of the laser lamp 10 in the height direction.

[0049] In one optional embodiment, the scissor-type telescopic frame 111 includes two support members 1111 and a connecting rod 1112 connecting the two support members 1111. The two sides of the support members 1111 are connected to the base 113 and the support plate 112. The two support members 1111 are stacked and spaced apart along the length direction of the base 113. The support members 1111 have a folded state and an unfolded state. When the support members 1111 switch from the folded state to the unfolded state, the support plate 112 moves away from the base 113.

[0050] By folding and unfolding the support member 1111, the support plate 112 can be moved repeatedly along its thickness direction.

[0051] Optionally, the underwater lifting waterproof laser device also includes a motor 13, which is mounted on the base 113 and connected to the linkage 1112. The motor 13 drives the linkage 1112 to move the support plate 112 away from or towards the base 113.

[0052] The motor 13 drives the linkage 1112, which in turn drives the support member 1111, causing the support member 1111 to gradually unfold or fold, thereby driving the support plate 112 and the laser lamp 10 to move up and down, and achieving precise control over the up and down movement of the support plate 112 and the laser lamp 10.

[0053] In one specific embodiment, the lifting platform 11 further includes two first limiting members 114 and two second limiting members 115. The two first limiting members 114 are all disposed on the side of the support plate 112 facing the base 113, and the two first limiting members 114 are disposed opposite to each other. The two second limiting members 115 are all disposed on the side of the base 113 facing the support plate 112, and the two first limiting members 114 are disposed opposite to each other. The first limiting members 114 have a first limiting hole 114a, and the second limiting members 115 have a second limiting hole 115a.

[0054] The support member 1111 includes a first connecting part 1113, a second connecting part 1114, a third connecting part 1115, and a fourth connecting part 1116. The first connecting part 1113 is hinged to the support plate 112, and the second connecting part 1114 is movably disposed in the corresponding first limiting hole 114a. The third connecting part 1115 is hinged to the base 113, and the fourth connecting part 1116 is movably disposed in the corresponding second limiting hole 115a.

[0055] Through the cooperation of the second connecting part 1114 and the first limiting hole 114a of the support member 1111, and the cooperation of the fourth connecting part 1116 and the second limiting hole 115a of the support member 1111, when the support plate 112 moves towards the base 113 under the action of the linkage rod 1112, the second connecting part 1114 abuts against one end of the first limiting hole 114a, and the fourth connecting part 1116 abuts against one end of the second limiting hole 115a. Under the limiting action of the first limiting hole 114a and the second limiting hole 115a, the support member 1111 no longer continues to fold. In this way, when the support member 1111 is folded to its maximum extent, there is enough space between the support plate 112 and the base 113 to place the motor 13.

[0056] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A waterborne lift type waterproof laser device comprising a lift platform, a laser lamp, characterized in that, The underwater lifting type waterproof laser equipment further comprises an adjusting mechanism, the laser lamp is rotationally connected with the lifting platform through the adjusting mechanism; the adjusting mechanism can drive the laser lamp to rotate around a first axis and the adjusting mechanism can drive the laser lamp to rotate around a second axis, the first axis intersects with the second axis, the direction of the first axis is consistent with the lifting direction of the lifting platform, and the angle of the laser lamp rotating around the second axis is smaller than the angle of the laser lamp rotating around the first axis.

2. The underwater lift-off waterproof laser apparatus according to claim 1, wherein, The adjusting mechanism comprises a first connecting piece and a second connecting piece, the first connecting piece is rotationally connected with the top of the lifting platform, and the second connecting piece is connected between the first connecting piece and the laser lamp. The first connecting piece can rotate relative to the lifting platform to drive the second connecting piece and the laser lamp to rotate around the first axis, and the second connecting piece can rotate relative to the first connecting piece to drive the laser lamp to rotate around the second axis.

3. The underwater lift-off waterproof laser apparatus according to claim 2, wherein, The first connecting piece comprises a first bottom plate and two first side plates, the first bottom plate is connected between the two first side plates; the second connecting piece comprises a second bottom plate and two second side plates, the second bottom plate is connected between the two second side plates, and the second bottom plate is connected with the laser lamp. The first bottom plate is rotationally connected with the top of the lifting platform, so that the laser lamp can rotate around the second axis, and the direction of the second axis is consistent with the thickness direction of the first bottom plate. The two second side plates are respectively rotationally connected with the corresponding first side plates, so that the laser lamp can rotate around the first axis, and the direction of the first axis is consistent with the thickness direction of the second side plate.

4. The underwater lift-off waterproof laser apparatus according to claim 3, wherein, The adjusting mechanism further comprises a first positioning piece and a second positioning piece, the first bottom plate is formed with a first adjusting hole, the first positioning piece is arranged on the top of the lifting platform, and the first positioning piece passes through the first adjusting hole; the two first side plates are respectively formed with a second adjusting hole, and the two second side plates are respectively provided with the second positioning piece, and the second positioning piece passes through the corresponding second adjusting hole; The first positioning piece cooperates with the first adjusting hole, and the second positioning piece cooperates with the second adjusting hole, so as to limit the rotation freedom degree of the laser lamp.

5. The underwater lift-off waterproof laser apparatus according to claim 4, wherein, The first positioning piece comprises a first positioning rod and a first fastener, the first positioning rod is arranged on the top of the lifting platform, the first positioning rod passes through the first adjusting hole, and the first fastener is threadedly connected with the first positioning rod; the second positioning piece comprises a second positioning rod and a second fastener, the two second side plates are respectively provided with the second positioning rod, the second positioning rod passes through the corresponding second adjusting hole, and the second fastener is threadedly connected with the corresponding second positioning rod; The first bottom plate can be fixed on the top of the lifting platform through the first fastener and the first positioning rod, and the second side plate can be fixed on the corresponding first side plate through the second fastener and the second positioning rod.

6. The underwater lift-off waterproof laser apparatus according to claim 4, wherein The opening of the first adjusting hole is a circular ring, and the opening of the second adjusting hole is an arc.

7. The underwater lift-off waterproof laser apparatus according to claim 1, wherein The lifting platform comprises a base, a support plate, and a scissor-type telescopic frame connected between the base and the support plate, and the adjusting mechanism is arranged on the support plate.

8. The underwater lift-off waterproof laser apparatus according to claim 7, wherein, The scissor-type telescopic frame comprises two support pieces and a linkage rod connected between the two support pieces, the two support pieces are connected to the base and the support plate on both sides, and the two support pieces are stacked and spaced along the length direction of the base; the support piece has a folded state and an unfolded state, and when the support piece switches from the folded state to the unfolded state, the support plate moves away from the base.

9. The underwater lift-off waterproof laser apparatus according to claim 8, wherein, The water-lifting waterproof laser equipment further comprises a motor arranged on the base, and the motor is connected with the linkage rod; the motor is used to drive the linkage rod to move the support plate away from the base or close to the base.

10. The underwater lift-off waterproof laser apparatus according to claim 9, wherein, The lifting platform further comprises two first limiters and two second limiters, the two first limiters are arranged on the side of the support plate facing the base, and the two first limiters are oppositely arranged; the two second limiters are arranged on the side of the base facing the support plate, and the two first limiters are oppositely arranged; the first limiter is formed with a first limiting hole, and the second limiter is formed with a second limiting hole. The support piece comprises a first connecting part, a second connecting part, a third connecting part and a fourth connecting part, the first connecting part is hinged to the support plate, the second connecting part is movably arranged in the corresponding first limiting hole; the third connecting part is hinged to the base, and the fourth connecting part is movably arranged in the corresponding second limiting hole.

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