Inclination angle adjusting mechanism of support arm and electronic equipment

Abstract

The utility model discloses a tilt angle adjusting mechanism of support arm and electronic equipment, relates to support design technical field, including bottom plate and drive device, be provided with first support on the bottom plate, support arm pivot joint on first support, drive device includes motor and transmission wheel set, motor is used for driving transmission wheel set to drive support arm rotation, the transmission wheel set comprises a plurality of speed reduction wheel sets which are meshed with one another, speed reduction of the motor can be achieved, the torque of the motor can be improved, compared with the prior art, the motor with the smaller size can be adopted under the condition that the same torque is kept, the installation space occupied by the motor can be reduced, and compact space layout of the electronic equipment can be achieved. And moreover, the angle adjusted by single start of the motor can be reduced, fine adjustment of the angle of the support arm is facilitated, and the use flexibility and the use experience are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to support design technical field, especially a kind of inclination adjusting mechanism of support arm and electronic equipment. BACKGROUND

[0002] With the development of science and technology, personal portable notebook computer, tablet computer and other electronic products are used in life on a large scale.However, the size of portable electronic products is limited, and a support is often used as support to adapt to different use scenarios.Currently, the support can adjust the inclination angle of support arm by motor to realize height adjustment.On the one hand, since the portable electronic product has a certain weight, the torque required when the motor starts is large, so a larger motor is often used, but it can easily lead to the size of the motor being too large, which is not conducive to space layout.On the other hand, the angle adjusted by the motor in a single start is large, and it is difficult to fine-tune the operation, which affects the use experience. SUMMARY

[0003] The utility model aims at at least solving one of the technical problems existing in the prior art.Therefore, the utility model provides a kind of inclination adjusting mechanism of support arm and electronic equipment, which can reduce the size of motor and the angle adjusted by motor in a single start, and improve the use experience.

[0004] According to the inclination adjusting mechanism of support arm of the first aspect of the utility model, it comprises:

[0005] The bottom plate is provided with a first support, and the support arm is pivotally connected to the first support.

[0006] The driving device comprises a motor and a transmission wheel set, the transmission wheel set is power-connected to the support arm, and the motor is used to drive the transmission wheel set to rotate the support arm;Wherein, the transmission wheel set comprises a plurality of mutually meshing speed reduction wheel sets.

[0007] According to the inclination adjusting mechanism of support arm of the first aspect of the utility model, at least the following beneficial effects are obtained:

[0008] In this embodiment, the first support and the driving device are arranged on the bottom plate, the support arm is pivotally connected to the first support, the driving device comprises a motor and a transmission wheel set, the motor is used to drive the transmission wheel set to rotate the support arm, wherein the transmission wheel set comprises a plurality of mutually meshing speed reduction wheel sets, which can realize speed reduction of the motor and improve the torque of the motor.Compared with the prior art, a smaller size motor can be used while maintaining the same torque, which is conducive to reducing the installation space occupied by the motor and realizing compact space layout.Furthermore, the angle adjusted by the motor in a single start can be reduced, which is convenient for angle fine-tuning of the support arm, and is conducive to improving use flexibility and use experience.

[0009] According to the embodiment of the first aspect of the utility model, transmission wheel group includes first transmission wheel, second transmission wheel, third transmission wheel, fourth transmission wheel and output wheel that mesh in proper order, first transmission wheel includes first tooth part and second tooth part, second transmission wheel includes third tooth part and fourth tooth part, third transmission wheel includes fifth tooth part and sixth tooth part, fourth transmission wheel includes seventh tooth part and eighth tooth part, output wheel is connected to support arm and is engaged with eighth tooth part.

[0010] According to the embodiment of the first aspect of the utility model, the speed reduction wheel set comprises a first wheel set, a second wheel set, a third wheel set and a fourth wheel set, the first wheel set comprises the second tooth part and the third tooth part which are engaged with each other, the second wheel set comprises the fourth tooth part and the fifth tooth part which are engaged with each other, the third wheel set comprises the sixth tooth part and the seventh tooth part which are engaged with each other, and the fourth wheel set comprises the eighth tooth part and the output wheel which are engaged with each other.

[0011] According to the embodiment of the first aspect of the utility model, the motor is provided with a fifth transmission wheel, and the fifth transmission wheel is engaged with the first tooth part.

[0012] According to the embodiment of the first aspect of the utility model, the outer diameter of the second tooth part is smaller than the outer diameter of the third tooth part, the outer diameter of the fourth tooth part is smaller than the outer diameter of the fifth tooth part, the outer diameter of the sixth tooth part is smaller than the outer diameter of the seventh tooth part, and the outer diameter of the eighth tooth part is smaller than the outer diameter of the output wheel.

[0013] According to the embodiment of the first aspect of the utility model, the other end of the support arm away from the bottom plate is provided with a second support, and the support arm is further provided with a first transmission rod and a second transmission rod, both ends of the first transmission rod and the second transmission rod are respectively pivotally connected to the first support and the second support, and the connecting line of the rotation centers of the first transmission rod and the first support and the second support is parallel to the connecting line of the rotation centers of the second transmission rod and the first support and the second support.

[0014] According to the embodiment of the first aspect of the utility model, the first support is provided with a limiting portion, and when the support arm rotates to a preset angle, the first transmission rod can abut against the limiting portion, so as to limit the rotation angle of the support arm.

[0015] According to the embodiment of the first aspect of the utility model, the bottom plate is provided with a connecting frame, and the driving device is installed on the connecting frame.

[0016] According to the embodiment of the first aspect of the utility model, the second tooth part, the third tooth part, the fourth tooth part, the fifth tooth part, the sixth tooth part and the seventh tooth part are all helical gears.

[0017] According to the embodiment of the second aspect of the utility model, an electronic device is provided, which comprises the inclination angle adjusting mechanism of the support arm.

[0018] The electronic device according to the embodiment of the second aspect of the utility model has at least the following beneficial effects:

[0019] The inclination adjusting mechanism of the support arm adopted in the embodiment is provided with a first support and a driving device on a bottom plate, the support arm is pivotally connected to the first support, and the driving device comprises a motor and a transmission wheel set, the motor is used to drive the transmission wheel set to drive the support arm to rotate, wherein the transmission wheel set comprises a plurality of speed reduction wheel sets which are meshed with each other, so that the speed reduction of the motor and the improvement of the torque of the motor can be realized, compared with the prior art, a smaller motor can be adopted under the condition of keeping the same torque, the installation space occupied by the motor is reduced, the compact space layout of the electronic device can be realized, the angle adjusted by the motor in single starting can be reduced, the angle fine adjustment of the support arm is facilitated, and the use flexibility and use experience are improved.

[0020] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described below in combination with the drawings and embodiments, wherein:

[0022] Figure 1 It is a perspective view of the inclination adjusting mechanism of the support arm in the embodiment of the first aspect of the present application;

[0023] Figure 2 It is Figure 1 It is an enlarged view of A in the embodiment of the first aspect of the present application;

[0024] Figure 3 It is an installation view of the first transmission rod and the second transmission rod in the embodiment of the first aspect of the present application;

[0025] Figure 4 It is an exploded view of the inclination adjusting mechanism of the support arm in the embodiment of the first aspect of the present application.

[0026] REFERENCE SIGNS:

[0027] The bottom plate 100; the first support 101; the limiting part 102; the first transmission rod 103; the first curved section 1031; the second curved section 1032; the body section 1033; the first connecting shaft 1034; the second connecting shaft 1035; the second transmission rod 104; the third connecting shaft 1041; the fourth connecting shaft 1042; the support arm 105; the second support 106; the cover 107; the cavity 108;

[0028] The driving device 110; the motor 111; the output wheel 112; the fifth transmission wheel 113;

[0029] Transmission wheel set 120; first transmission wheel 121; first tooth part 1211; second tooth part 1212; second transmission wheel 122; third tooth part 1221; fourth tooth part 1222; third transmission wheel 123; fifth tooth part 1231; sixth tooth part 1232; fourth transmission wheel 124; seventh tooth part 1241; eighth tooth part 1242; first wheel set 125; second wheel set 126; third wheel set 127; fourth wheel set 128. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are merely intended to explain the present application, and cannot be understood as a limitation of the present application.

[0031] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0032] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0033] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0034] With the development of science and technology, personal portable notebook computers, tablet computers and other electronic products are widely used in life. However, the size of portable electronic products is limited, and a support is often used as a support to adapt to different use scenarios. The current support can adjust the inclination angle of the support arm by using a motor to realize height adjustment. Since the electronic product has a certain weight, the torque required when the motor starts is large, so a larger motor is often used, but it is easy to cause the size of the motor to be too large, which is not conducive to space layout. On the other hand, the angle adjusted by the motor in a single start is large, and it is difficult to perform fine adjustment operation, which affects the use experience.

[0035] To solve the above problems, with reference to Figure 1 In the tilt angle adjusting mechanism of the support arm of the first aspect embodiment of the utility model, including the bottom plate 100 and the drive device 110, the first support 101 of fixed installation is provided on the bottom plate 100, and the support arm 105 is pivotally connected to the first support 101. A connecting frame (not shown in the figure) is provided on the bottom plate 100, and the drive device 110 is installed on the connecting frame. The drive device 110 includes a motor 111 and a transmission wheel set 120. The motor 111 is used to drive the transmission wheel set 120 to drive the support arm 105 to rotate. It can be understood that the motor 111 is fixedly installed on the connecting frame, and the transmission wheel in the transmission wheel set 120 is pivotally connected to the connecting frame. Among them, the transmission wheel set 120 includes a plurality of mutually meshing speed reduction wheel sets, which can realize the speed reduction of the motor 111 and improve the torque of the motor 111. Compared with the prior art, a smaller size motor 111 can be used under the condition of keeping the same torque, which is helpful to reduce the installation space occupied by the motor 111 and can realize the compact space layout of the electronic equipment. And it can reduce the angle adjusted by the motor 111 in single start, which is convenient for the angle fine adjustment of the support arm 105, and is helpful to improve the use flexibility and improve the use experience.

[0036] Specifically, with reference to Figure 2 The transmission wheel set 120 includes a first transmission wheel 121, a second transmission wheel 122, a third transmission wheel 123, a fourth transmission wheel 124 and an output wheel 112, which are sequentially meshed. The first transmission wheel 121 includes a first tooth part 1211 and a second tooth part 1212. The second transmission wheel 122 includes a third tooth part 1221 and a fourth tooth part 1222. The third transmission wheel 123 includes a fifth tooth part 1231 and a sixth tooth part 1232. The fourth transmission wheel 124 includes a seventh tooth part 1241 and an eighth tooth part 1242. The output wheel 112 is connected to the support arm 105 and meshes with the eighth tooth part 1242. It can be understood that the first tooth part 1211, the second tooth part 1212, the third tooth part 1221, the fourth tooth part 1222, the fifth tooth part 1231, the sixth tooth part 1232, the seventh tooth part 1241 and the eighth tooth part 1242 are all gear wheels, and the second tooth part 1212, the third tooth part 1221, the fourth tooth part 1222, the fifth tooth part 1231, the sixth tooth part 1232 and the seventh tooth part 1241 are all helical gear wheels. Since the teeth of the helical gear wheel gradually enter and exit the meshing, the impact load can be reduced, the transmission is more stable, the noise level during operation is reduced, and the contact area between the two teeth of the helical meshing is larger, which can withstand higher load than the spur gear, thereby improving the transmission stability of the transmission wheel set 120. With reference to Figure 2 It can be understood that the first transmission wheel 121 and the third transmission wheel 123 are coaxially arranged, which is helpful to realize the compact space layout and improve the space utilization.

[0037] It can be understood that the first tooth portion 1211 and the second tooth portion 1212 rotate coaxially and synchronously, and the outer diameter of the first tooth portion 1211 is greater than that of the second tooth portion 1212. The third tooth portion 1221 and the fourth tooth portion 1222 rotate coaxially and synchronously, and the outer diameter of the third tooth portion 1221 is greater than that of the fourth tooth portion 1222. The fifth tooth portion 1231 and the sixth tooth portion 1232 rotate coaxially and synchronously, and the outer diameter of the fifth tooth portion 1231 is greater than that of the sixth tooth portion 1232. The seventh tooth portion 1241 and the eighth tooth portion 1242 rotate coaxially and synchronously, and the outer diameter of the seventh tooth portion 1241 is greater than that of the eighth tooth portion 1242. It can be understood that the "outer diameter" of the first tooth portion 1211 is the maximum outer diameter of the first tooth portion 1211, that is, the maximum value of twice the distance between the outer peripheral wall of the tooth on the outer periphery of the first tooth portion 1211 and the rotation axis of the first tooth portion 1211, and the outer diameters of the second tooth portion 1212, the third tooth portion 1221, the fourth tooth portion 1222, the fifth tooth portion 1231, the sixth tooth portion 1232, the seventh tooth portion 1241 and the eighth tooth portion 1242 are the maximum outer diameters respectively, which will not be described here.

[0038] It can be understood that the first tooth portion 1211 and the second tooth portion 1212, the third tooth portion 1221 and the fourth tooth portion 1222, the fifth tooth portion 1231 and the sixth tooth portion 1232, the seventh tooth portion 1241 and the eighth tooth portion 1242 can be fixed by integral molding or by assembly respectively.

[0039] Referring to Figure 4It can be understood that the speed reduction wheel set includes a first wheel set 125, a second wheel set 126, a third wheel set 127 and a fourth wheel set 128. The first wheel set 125 includes a second tooth portion 1212 and a third tooth portion 1221 that are engaged with each other. It can be understood that the outer diameter of the second tooth portion 1212 is smaller than the outer diameter of the third tooth portion 1221, so as to realize the transmission speed reduction function, which is conducive to improving the transmission torque of the motor 111 and reducing the rotation angle adjusted by the motor 111 in a single start. The second wheel set 126 includes a fourth tooth portion 1222 and a fifth tooth portion 1231 that are engaged with each other. It can be understood that the outer diameter of the fourth tooth portion 1222 is smaller than the outer diameter of the fifth tooth portion 1231, so as to realize the transmission speed reduction function, which is conducive to improving the transmission torque of the motor 111 and reducing the rotation angle adjusted by the motor 111 in a single start. The third wheel set 127 includes a sixth tooth portion 1232 and a seventh tooth portion 1241 that are engaged with each other. It can be understood that the outer diameter of the sixth tooth portion 1232 is smaller than the outer diameter of the seventh tooth portion 1241, so as to realize the transmission speed reduction function, which is conducive to improving the transmission torque of the motor 111 and reducing the rotation angle adjusted by the motor 111 in a single start, and improving the flexibility of adjustment. The fourth wheel set 128 includes an eighth tooth portion 1242 and the output wheel 112 that are engaged with each other. It can be understood that the outer diameter of the eighth tooth portion 1242 is smaller than the outer diameter of the output wheel 112, so as to realize the transmission speed reduction function, which is conducive to improving the transmission torque of the motor 111 and reducing the rotation angle adjusted by the motor 111 in a single start, and improving the flexibility of adjustment.

[0040] It can be understood that the motor 111 is provided with a fifth transmission wheel 113, and the fifth transmission wheel 113 is engaged with the first tooth portion 1211. Moreover, the outer diameter of the fifth transmission wheel 113 is smaller than the outer diameter of the first tooth portion 1211, so as to realize the speed reduction function. It can be understood that the four groups of speed reduction wheel sets can realize step-by-step speed reduction, which is conducive to improving the rotation of the motor 111, so as to reduce the size of the motor 111 under the premise of providing the same torque, and can reduce the rotation angle adjusted by the motor 111 in a single start, and improve the use experience in fine adjustment.

[0041] Referring to Figure 3It can be understood that the other end of the support arm 105 away from the base plate 100 is provided with a second support 106, and the second support 106 is used for mounting portable electronic products such as laptops, tablets and the like. Further, the support arm 105 has a cavity 108, and the support arm 105 is further provided with a first transmission rod 103 and a second transmission rod 104, and the first transmission rod 103 and the second transmission rod 104 are embedded in the cavity 108, which is beneficial to improve the appearance of the appearance. It can be understood that in this embodiment, the support arm 105 is provided with a cavity 108 on both sides along the width direction, and the first transmission rod 103 and the second transmission rod 104 are arranged in the cavity 108 on both sides, which is beneficial to improve the stability of transmission. Further, the support arm 105 is provided with a cover 107 on both sides, and the cover 107 covers the cavity 108, thereby covering and shielding the first transmission rod 103 and the second transmission rod 104, which is beneficial to improve the appearance of the support arm 105.

[0042] It can be understood that the two ends of the first transmission rod 103 and the second transmission rod 104 are respectively pivotally connected to the first support 101 and the second support 106, and the connecting line of the rotation centers of the first transmission rod 103 and the first support 101 and the second support 106 is parallel to the connecting line of the rotation centers of the second transmission rod 104 and the first support 101 and the second support 106. Specifically, referring to Figure 3 , the first transmission rod 103 has a first connecting shaft 1034 at the hinged part with the first support 101, and has a second connecting shaft 1035 at the hinged part with the second support 106, and the second transmission rod 104 has a third connecting shaft 1041 at the hinged part with the first support 101, and has a fourth connecting shaft 1042 at the hinged part with the second support 106. When rotating, the connecting line between the axis of the first connecting shaft 1034 and the axis of the second connecting shaft 1035 is parallel to the connecting line between the axis of the third connecting shaft 1041 and the axis of the fourth connecting shaft 1042, so as to keep the inclination angle between the second support 106 and the horizontal plane, so that the electronic product placed on the second support 106 remains stable relative to the inclination angle of the horizontal plane when adjusting the inclination angle of the support arm 105 to adjust the height, which can simplify the adjustment operation and improve the use experience.

[0043] Referring to Figure 4It can be understood that the first transmission rod 103 comprises a body segment 1033 and a first curved segment 1031 and a second curved segment 1032 located at both ends of the body segment 1033, a first connecting shaft 1034 is located at the end of the first curved segment 1031, and a second connecting shaft 1035 is located at the end of the second curved segment 1032, and the first curved segment 1031 and the second curved segment 1032 are both inclined relative to the body segment 1033, so that the body segment 1033 is close to the second transmission rod 104, which is beneficial to improve the installation compactness of the first transmission rod 103 and the second transmission rod 104 in the support arm 105, and improve the aesthetic appearance while saving space.

[0044] With reference to Figure 4 It can be understood that the first support 101 is provided with a limiting portion 102, and the first transmission rod 103 can abut against the limiting portion 102 when the support arm 105 is rotated to a preset angle, so as to limit the rotation angle of the support arm 105. Specifically, the first transmission rod 103 and the second transmission rod 104 are respectively pivotally connected to both sides of the first support 101 along the rotation axis of the support arm 105, and the limiting portion 102 protrudes from the first support 101 to one side of the first transmission rod 103 along the rotation axis of the support arm 105, so that when the support arm 105 is lifted to a preset limiting height, the first curved segment 1031 of the first transmission rod 103 can abut against the limiting portion 102, and the support arm 105 cannot continue to rotate, thereby limiting the rotation angle of the support arm 105.

[0045] In the electronic device of the second aspect of the present application, the electronic device comprises the support arm inclination adjusting mechanism. It can be understood that the electronic device comprises all the technical features of the support arm inclination adjusting mechanism, and therefore the electronic device at least has all the beneficial effects of the support arm inclination adjusting mechanism.

[0046] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A tilt angle adjusting mechanism of a boom, characterized by, The utility model relates to a kind of angle-adjusting mechanism of arm, including: Bottom plate is equipped with first support, and branch arm is pivoted to the first support; Driving device includes motor and transmission wheel group, the transmission wheel group is power-connected to the branch arm, and the motor is used to drive the transmission wheel group to drive the branch arm rotation;The transmission wheel group includes first transmission wheel, second transmission wheel, third transmission wheel, fourth transmission wheel and output wheel in turn, the first transmission wheel includes first tooth part and second tooth part, the second transmission wheel includes third tooth part and fourth tooth part, the third transmission wheel includes fifth tooth part and sixth tooth part, the fourth transmission wheel includes seventh tooth part and eighth tooth part, and the output wheel is connected to the branch arm and is engaged with the eighth tooth part;Wherein, the transmission wheel group includes a plurality of mutually engaged speed reduction wheel groups, and the speed reduction wheel group includes first wheel group, second wheel group, third wheel group and fourth wheel group, the first wheel group includes second tooth part and third tooth part, the second wheel group includes fourth tooth part and fifth tooth part, the third wheel group includes sixth tooth part and seventh tooth part, and the fourth wheel group includes eighth tooth part and output wheel.

2. The tilt angle adjustment mechanism of the boom according to claim 1, characterized by, The motor is equipped with fifth transmission wheel, and the fifth transmission wheel is engaged with the first tooth part.

3. The tilt angle adjustment mechanism of the boom according to claim 1, characterized by, The outer diameter of the second tooth part is less than the outer diameter of the third tooth part, the outer diameter of the fourth tooth part is less than the outer diameter of the fifth tooth part, the outer diameter of the sixth tooth part is less than the outer diameter of the seventh tooth part, and the outer diameter of the eighth tooth part is less than the outer diameter of the output wheel.

4. The tilt angle adjustment mechanism of the boom according to claim 1, characterized by, The other end of the branch arm away from the bottom plate is equipped with second support, and the branch arm is also equipped with first transmission rod and second transmission rod, and the two ends of the first transmission rod and the second transmission rod are respectively pivoted to the first support and the second support, and the connecting line of the rotation center of the first transmission rod and the second transmission rod is parallel to the connecting line of the rotation center of the first support and the second support.

5. The tilt angle adjustment mechanism of claim 4, wherein The first support is equipped with limiting part, and the first transmission rod can abut against the limiting part when the branch arm rotates to the preset angle, to limit the rotation angle of the branch arm.

6. The tilt angle adjustment mechanism of a boom according to claim 1, characterized by, The bottom plate is equipped with connecting frame, and the driving device is installed on the connecting frame.

7. The tilt angle adjustment mechanism of a boom according to claim 1, characterized by, The second tooth part, the third tooth part, the fourth tooth part, the fifth tooth part, the sixth tooth part and the seventh tooth part are all helical gears.

8. An electronic device, characterized by The utility model relates to a kind of angle-adjusting mechanism of arm, including: Bottom plate is equipped with first support, and branch arm is pivoted to the first support; Driving device includes motor and transmission wheel group, the transmission wheel group is power-connected to the branch arm, and the motor is used to drive the transmission wheel group to drive the branch arm rotation;The transmission wheel group includes first transmission wheel, second transmission wheel, third transmission wheel, fourth transmission wheel and output wheel in turn, the first transmission wheel includes first tooth part and second tooth part, the second transmission wheel includes third tooth part and fourth tooth part, the third transmission wheel includes fifth tooth part and sixth tooth part, the fourth transmission wheel includes seventh tooth part and eighth tooth part, and the output wheel is connected to the branch arm and is engaged with the eighth tooth part;Wherein, the transmission wheel group includes a plurality of mutually engaged speed reduction wheel groups, and the speed reduction wheel group includes first wheel group, second wheel group, third wheel group and fourth wheel group, the first wheel group includes second tooth part and third tooth part, the second wheel group includes fourth tooth part and fifth tooth part, the third wheel group includes sixth tooth part and seventh tooth part, and the fourth wheel group includes eighth tooth part and output wheel. The motor is equipped with fifth transmission wheel, and the fifth transmission wheel is engaged with the first tooth part. The outer diameter of the second tooth part is less than the outer diameter of the third tooth part, the outer diameter of the fourth tooth part is less than the outer diameter of the fifth tooth part, the outer diameter of the sixth tooth part is less than the outer diameter of the seventh tooth part, and the outer diameter of the eighth tooth part is less than the outer diameter of the output wheel. The other end of the branch arm away from the bottom plate is equipped with second support, and the branch arm is also equipped with first transmission rod and second transmission rod, and the two ends of the first transmission rod and the second transmission rod are respectively pivoted to the first support and the second support, and the connecting line of the rotation center of the first transmission rod and the second transmission rod is parallel to the connecting line of the rotation center of the first support and the second support. The first support is equipped with limiting part, and the first transmission rod can abut against the limiting part when the branch arm rotates to the preset angle, to limit the rotation angle of the branch arm. The bottom plate is equipped with connecting frame, and the driving device is installed on the connecting frame. The second tooth part, the third tooth part, the fourth tooth part, the fifth tooth part, the sixth tooth part and the seventh tooth part are all helical gears. The utility model relates to a kind of angle-adjusting mechanism of arm, including: Bottom plate is equipped with first support, and branch arm is pivoted to the first support; Driving device includes motor and transmission wheel group, the transmission wheel group is power-connected to the branch arm, and the motor is used to drive the transmission wheel group to drive the branch arm rotation;The transmission wheel group includes first transmission wheel, second transmission wheel, third transmission wheel, fourth transmission wheel and output wheel in turn, the first transmission wheel includes first tooth part and second tooth part, the second transmission wheel includes third tooth part and fourth tooth part, the third transmission wheel includes fifth tooth part and sixth tooth part, the fourth transmission wheel includes seventh tooth part and eighth tooth part, and the output wheel is connected to the branch arm and is engaged with the eighth tooth part;Wherein, the transmission wheel group includes a plurality of mutually engaged speed reduction wheel groups, and the speed reduction wheel group includes first wheel group, second wheel group, third wheel group and fourth wheel group, the first wheel group includes second tooth part and third tooth part, the second wheel group includes fourth tooth part and fifth tooth part, the third wheel group includes sixth tooth part and seventh tooth part, and the fourth wheel group includes eighth tooth part and output wheel. The motor is equipped with fifth transmission wheel, and the fifth transmission wheel is engaged with the first tooth part. The outer diameter of the second tooth part is less than the outer diameter of the third tooth part, the outer diameter of the fourth tooth part is less than the outer diameter of the fifth tooth part, the outer diameter of the sixth tooth part is less than the outer diameter of the seventh tooth part, and the outer diameter of the eighth tooth part is less than the outer diameter of the output wheel. The other end of the branch arm away from the bottom plate is equipped with second support, and the branch arm is also equipped with first transmission rod and second transmission rod, and the two ends of the first transmission rod and the second transmission rod are respectively pivoted to the first support and the second support, and the connecting line of the rotation center of the first transmission rod and the second transmission rod is parallel to the connecting line of the rotation center of the first support and the second support. The first support is equipped with limiting part, and the first transmission rod can abut against the limiting part when the branch arm rotates to the preset angle, to limit the rotation angle of the branch arm. The bottom plate is equipped with connecting frame, and the driving device is installed on the connecting frame. The second tooth part, the third tooth part, the fourth tooth part, the fifth tooth part, the sixth tooth part and the seventh tooth part are all helical gears. The utility model relates to a kind of angle-adjusting mechanism of arm, including:

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