阅读说明：本技术 一种无人机 (Unmanned aerial vehicle ) 是由 金国强 金祚顺 辛华翔 丁晓俐 于 2020-07-24 设计创作，主要内容包括：本发明公开了一种无人机,包括机身以及底座。所述机身设有桨臂、桨叶和调节机构,所述底座上设置有第一缓冲组件和第二缓冲组件。本发明中桨臂与第一连接臂连接,通过第一连接臂的水平运动使得桨臂的伸缩,此后再通过固定装置予以固定,从而实现了桨臂的可伸缩；另外本发明还设置第一缓冲组件和第二缓冲组件,第一缓冲组件在无人机降落时因为第一缓冲弹簧的存在能够在竖直方向起到缓冲作用；第二缓冲组件在降落时,能够向外撑开,起到辅助的缓冲作用且能保证无人机的稳定性,防止倾倒,本发明有效解决了现有技术中遇到的问题。(The invention discloses an unmanned aerial vehicle which comprises a vehicle body and a base. The fuselage is equipped with oar arm, paddle and adjustment mechanism, be provided with first buffering subassembly and second buffering subassembly on the base. According to the telescopic type propeller arm, the propeller arm is connected with the first connecting arm, the propeller arm is stretched through the horizontal movement of the first connecting arm, and then is fixed through the fixing device, so that the telescopic type propeller arm is realized; in addition, the unmanned aerial vehicle is also provided with a first buffer assembly and a second buffer assembly, and the first buffer assembly can play a buffer role in the vertical direction due to the existence of a first buffer spring when the unmanned aerial vehicle lands; when the second buffering assembly descends, the second buffering assembly can be outwards propped open, an auxiliary buffering effect is achieved, the stability of the unmanned aerial vehicle can be guaranteed, and the unmanned aerial vehicle is prevented from toppling over.)

1. An unmanned aerial vehicle comprises a vehicle body (2) and a base (3),

the top of the machine body (2) is provided with at least two paddle arms (4), and the paddle arms (4) are symmetrically arranged; the paddle arm is provided with a paddle (6) arranged on the paddle arm (4) and a power device for driving the paddle (4) to rotate; still install two at least adjustment mechanism on the fuselage, every adjustment mechanism with oar arm (4) correspond, adjustment mechanism has: a first connecting arm (602) which is coaxially arranged with the paddle arm (4) and is fixedly connected with the paddle arm; the driving device drives the first connecting arm (602) to do telescopic motion along the axis of the first connecting arm; a fixing device for fixing the paddle arm (4) to the fuselage (2);

base (3) below is provided with first buffering subassembly (5) and second buffering subassembly (7), wherein:

-said first damping assembly (5) comprises a first support pillar (502) fixed in a central position below said base (3), and a damping seat (504) mounted below said first support pillar (502), said first support pillar (502) being at least partially insertable in said damping seat (504) and slidable therein in a vertical direction, a first damping spring (506) being connected between said damping seat (504) and said base (3);

-at least four second buffer assemblies (7) are arranged and evenly arranged along the circumferential direction of the lower surface of the base (3), each second buffer assembly (7) comprises a telescopic arm (702) which is fixed below the base (3) and can be stretched, and a rotating arm (704) which is rotatably connected to the free end of the bottom of the telescopic arm (702), a second buffer spring (708) which is used for providing buffer force when the telescopic arm (702) stretches upwards is arranged on the telescopic arm, and the buffer force when the free end of the bottom of the rotating arm (704) moves upwards is provided by a third buffer spring (710).

2. A drone according to claim 1, characterised in that each of said adjustment mechanisms is provided with:

a fixing plate (606) mounted on the body (2);

a plurality of turntables (608) rotatably connected to the fixed plate (606), wherein the turntables (608) are driven to rotate by a rotating shaft (8);

a first bump (610) arranged on the surface of the turntable (608);

a second protrusion (612) disposed on the fixing plate (606);

the shifting lever (614) is rotatably connected to the fixing plate (606) through the second convex block (612), a shifting groove (616) parallel to the axis of the shifting lever (614) is formed in the shifting lever (614), the first convex block (610) is located in the shifting groove (616), and a first toothed section (618) with one arc-shaped end is further arranged at one free end of the shifting lever (614);

a sliding rod (620) slidably connected to the fixing plate (606), wherein the axial direction of the sliding rod (620) is perpendicular to the line connecting the first protrusion (610) and the second protrusion (612);

a second toothed segment (622) fixed on the sliding rod (620) and having a strip-shaped structure, the second toothed segment (621) being parallel to the axis of the sliding rod (620) and engaged with the first toothed segment (618);

a connecting rod (624) connecting the sliding rod (620) and the first connecting arm (602), wherein the connecting rod (624) is a straight rod or a bent rod, and all the sliding rods (620) are located in the same plane through the connection of the connecting rod (624).

3. A drone according to claim 2, characterised in that the telescopic arm (702) has:

a first arm body (712) fixed on the lower surface of the base (3);

connect in the second arm body (714) of first arm body (712) below, first arm body (712) can at least partially stretch into in the second arm body (714) and slide wherein, second buffer spring (708) cover is established on first arm body (712), its both ends are restricted respectively between the end wall of second arm body (714) and the first ring baffle at first arm body (712) top, second arm body (714) bottom is provided with and link up the groove, swivel arm (704) rotate to be connected in link up the inslot.

4. An unmanned aerial vehicle according to claim 3, wherein the second buffering assembly (7) further comprises a second connecting arm (716) with two ends respectively rotatably connected to the second arm body (714) and the rotating arm (704), the second connecting arm (716) is provided with a third arm body (718) rotatably connected to the second arm body (714), and a fourth arm body (720) rotatably connected to the rotating arm (704), the fourth arm body (720) can be inserted into the third arm body (718) and can slide therein, a second ring-shaped baffle is arranged on each of the third arm body (718) and the fourth arm body (720), and the third buffering spring (708) is limited in the second ring-shaped baffle.

5. An unmanned aerial vehicle according to claim 4, wherein each of the second arm body (714) and the rotating arm (704) is provided with two sets of second connecting arms (716) and third buffer springs (710), and the two sets of second connecting arms (716) are arranged symmetrically along the axis of the second arm body (714) and the rotating arm (704).

6. An unmanned aerial vehicle according to claim 5, wherein the lower surface of the base (3) is provided with four horizontal first sliding grooves (902) along the circumferential direction, and two adjacent first sliding grooves (902) are vertically arranged;

a first sliding block (904) capable of sliding in the first sliding groove (902) is arranged in the first sliding groove (902), the first sliding block (904) is perpendicular to the first sliding groove (902), a second sliding groove (906) parallel to the axis of the first sliding block is arranged in the first sliding groove, and the first arm body (712) is installed in the second sliding groove (906) and can slide in the second sliding groove.

7. An unmanned aerial vehicle according to claim 6, wherein at least two fixing sleeves (10) are fixed on the fuselage (2), the paddle arm (4) is at least partially inserted into a through hole of the fixing sleeves (10), at least one fixing strip (1002) parallel to the axis of the paddle arm (4) is arranged on the wall of the through hole, a sliding groove (402) is arranged on the paddle arm (4), and the fixing strip (1002) can slide relatively in the sliding groove (402).

8. A drone according to claim 7, characterised in that the paddle arms (4) are provided in four and with an angle of 90 degrees between them.

9. An unmanned aerial vehicle according to claim 8, wherein the paddle arm (2) is provided with a first sliding slot penetrating through the upper and lower surfaces thereof, the fixing sleeve (10) is provided with a second sliding slot penetrating through the upper and lower surfaces thereof, the fixing means are a fixing bolt (1202) and a fixing nut (1204), the fixing bolt (1202) passes through the first and second sliding slots, and the fixing nut (1204) clamps the paddle arm (2) and the fixing sleeve (10).

10. An unmanned aerial vehicle according to claim 9, wherein the free end of the bottom of the rotating arm (704) is provided with a universal joint, and the bottom of the universal joint is provided with a roller.

Technical Field

The invention relates to an unmanned aerial vehicle.

Background

Unmanned aerial vehicle, unmanned aerial vehicle for short, it is a new concept equipment in rapid development, it has flexible, fast, unmanned, advantage that the operation requirement is low of reaction, unmanned aerial vehicle can realize the real-time transmission of the image, high-risk area detection function through carrying on multiclass sensor or camera equipment, it is the powerful supplement of satellite remote sensing and traditional aerial remote sensing, at present, the application range of unmanned aerial vehicle has been widened to military affairs, scientific research, civil three fields, specifically in the fields such as electric power communication, meteorology, agriculture, ocean, exploration, photography, preventing and reducing the disaster, crops estimate production, seize poison and seize the property, border patrol, security and counter-terrorism and so on very wide.

Disclosure of Invention

The invention aims to provide an unmanned aerial vehicle which is good in buffering effect and can realize extension of a paddle arm.

In order to solve the problems, the invention provides an unmanned aerial vehicle which comprises a vehicle body and a base and is characterized in that,

the top of the machine body is provided with at least two paddle arms which are symmetrically arranged; the paddle arm is provided with a paddle arranged on the paddle arm, and the power device drives the paddle to rotate; still install two at least adjustment mechanism on the fuselage, every adjustment mechanism with the oar arm corresponds, adjustment mechanism has: the connecting arm is coaxially arranged with the paddle arm and fixedly connected with the paddle arm; the driving device drives the connecting arm to do telescopic motion along the axis of the connecting arm; a fixing device for fixing the paddle arm with the machine body;

base below is provided with first buffering subassembly and second buffering subassembly, wherein:

-said first damping assembly comprises a first support pillar fixed in a central position below said base, and a damping seat mounted below said first support pillar, said first support pillar being at least partially insertable into said damping seat and slidable therein in a vertical direction, a first damping spring being connected between said damping seat and said base;

the number of the second buffer assemblies is at least four, the second buffer assemblies are circumferentially and uniformly arranged along the lower surface of the base, each second buffer assembly comprises a telescopic arm which is fixed below the base and can stretch and retract, and a rotating arm which is rotatably connected to the free end of the bottom of the telescopic arm, a second buffer spring which is used for providing buffer force when the telescopic arm stretches upwards is arranged on the telescopic arm, and the rotating arm is buffered when the free end of the bottom of the rotating arm moves upwards by a third buffer spring.

As a further improvement of the present invention, each of the adjusting mechanisms is provided with:

a fixed plate mounted on the body;

the rotary tables are rotationally connected to the fixed plate, and the rotary tables are driven to rotate by a rotating shaft;

the first bump is arranged on the surface of the rotary disc;

a second projection arranged on the fixing plate;

the shifting rod is rotatably connected to the fixed plate through the second convex block, a shifting groove parallel to the axis of the shifting rod is formed in the shifting rod, the first convex block is located in the shifting groove, and a first toothed section with an arc-shaped end is further arranged at one free end of the shifting rod;

the sliding rod is connected to the fixing plate in a sliding mode, and the axial direction of the sliding rod is perpendicular to a connecting line of the first lug and the second lug;

the second toothed section is fixed on the sliding rod and is of a strip structure, and the second toothed section is parallel to the axis of the sliding rod and meshed with the first toothed section;

and the connecting rod is a straight rod or a bent rod, and all the sliding rods are positioned in the same plane through connection of the connecting rod and the straight rod or the bent rod.

As a further improvement of the present invention, the telescopic arm has:

the first arm body is fixed on the lower surface of the base;

connect the second arm body of first arm body below, first arm body can partially stretch into at least the second arm is internal and slide wherein, second buffer spring cover is established on the first arm body, its both ends are restricted respectively the end wall of the second arm body and between the first ring baffle at first arm body top, second arm body bottom is provided with and link up the groove, the swinging boom rotates to be connected link up in the groove.

As a further improvement of the present invention, the second buffer assembly further includes a second connecting arm having two ends respectively rotatably connected to the second arm body and the rotating arm, the second connecting arm is provided with a third arm body rotatably connected to the second arm body, and a fourth arm body rotatably connected to the rotating arm, the fourth arm body can be inserted into the third arm body and can slide therein, the third arm body and the fourth arm body are both provided with a second annular baffle, and the third buffer spring is limited in the second annular baffle.

As a further improvement of the invention, two groups of second connecting arms and third buffer springs are correspondingly arranged on each second arm body and each rotating arm, and the two groups of second connecting arms are symmetrically arranged along the axes of the second arm bodies and the rotating arms.

As a further improvement of the invention, four horizontal first sliding grooves are respectively arranged on the lower surface of the base along the circumferential direction, and two adjacent first sliding grooves are vertically arranged;

the first sliding groove is internally provided with a first sliding block which can slide in the first sliding groove, the first sliding block is perpendicular to the first sliding groove and is provided with a second sliding groove parallel to the axis of the first sliding groove, and the first arm body is arranged in the second sliding groove and can slide in the second sliding groove.

As a further improvement of the invention, at least two fixing sleeves are fixed on the machine body, the paddle arm is at least partially inserted into a through hole of the fixing sleeves, at least one fixing strip parallel to the axis of the paddle arm is arranged on the hole wall of the through hole, a sliding groove is arranged on the paddle arm, and the fixing strips can slide relatively in the sliding groove.

As a further improvement of the invention, the four paddle arms are arranged, and the included angles between the four paddle arms are degrees.

As a further improvement of the present invention, the paddle arm is provided with a first sliding groove penetrating through the upper and lower surfaces thereof, the fixing sleeve is provided with a second sliding groove penetrating through the upper and lower surfaces thereof, the fixing device is a fixing bolt and a fixing nut, the fixing bolt penetrates through the first sliding groove and the second sliding groove, and the fixing bolt and the fixing nut clamp the paddle arm and the fixing sleeve.

As a further improvement of the invention, the free end of the bottom of the rotating arm is provided with a universal joint, and the bottom of the universal joint is provided with a roller.

As a further improvement of the invention, an auxiliary connecting rod is also fixedly connected to the connecting rod, and the sliding rod is connected with the connecting arm through the connecting rod or the auxiliary connecting rod.

As a further improvement of the invention, the rotating shaft is fixedly connected with a gear reducer, and the gear reducer is driven by a stepping motor to rotate.

As a further improvement of the invention, the bottom of the buffer seat is provided with a buffer pad.

As a further improvement of the present invention, a box body is further disposed below the base, and the first buffer assembly and the second buffer assembly are located in the box body and can partially extend out of the box body.

The telescopic unmanned aerial vehicle has the beneficial effects that the paddle arm is connected with the first connecting arm, the paddle arm is stretched through the horizontal movement of the first connecting arm and then is fixed through the fixing device, so that the stretching of the paddle arm is realized, in addition, the telescopic unmanned aerial vehicle is also provided with the first buffering assembly and the second buffering assembly, and the first buffering assembly can play a role in buffering in the vertical direction due to the existence of the first buffering spring when the unmanned aerial vehicle lands; when the second buffering assembly descends, the second buffering assembly can be outwards propped open, an auxiliary buffering effect is achieved, the stability of the unmanned aerial vehicle can be guaranteed, and the unmanned aerial vehicle is prevented from toppling over.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the connection of the adjustment mechanism to the paddle arm;

FIG. 3 is a schematic structural view of an adjustment mechanism;

fig. 4 is a schematic structural view of the base of the present invention.

In the figure: 2-a fuselage; 3-a base; 4-paddle arm; 5-a first cushioning component; 502-a first support column; 504-a buffer seat; 506-a first buffer spring; 6-a blade; 602-a first connecting arm; 606-fixing the plate; 608-a carousel; 610-a first bump; 612-second bump; 614-deflector rod; 616-a toggle slot; 618-first toothed segment; 620-sliding bar; 621-a second toothed segment; 624-connecting rod; 626-auxiliary connecting rods; 7-a second cushioning component; 702-a telescopic arm; 704-a rotating arm; 708-a second buffer spring; 710-a third buffer spring; 712-a first arm; 714-a second arm body; 716-a second connecting arm; 718-a third arm; 720-a fourth arm; 8-a rotating shaft; 902-a first sliding channel; 904 — first slider; 906-a second chute; 10-fixing a sleeve; 1002-fixing strip; 11-a box body; 1202-fixing the bolt; 1204-fixing the nut.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1 to 4, the present invention comprises a body 2 and a base 3, and is characterized in that,

the top of the machine body 2 is provided with at least two paddle arms 4, and the paddle arms 4 are symmetrically arranged; the paddle arm 4 is provided with a paddle 6 arranged on the paddle arm 4, and a power device for driving the paddle 6 to rotate; still install two at least adjustment mechanism on the fuselage 2, every adjustment mechanism with oar arm 4 corresponds, adjustment mechanism has: a first connecting arm 602 which is coaxially disposed with the paddle arm 4 and is fixedly connected thereto; a driving device for driving the first connecting arm 602 to perform telescopic motion along the axis thereof; a fixing device for fixing the paddle arm 4 to the body 2;

base 3 below is provided with first buffer unit 5 and second buffer unit 7, wherein:

said first damping member 5 comprises a first supporting pillar 502 fixed in a central position below said base 3, and a damping seat 504 mounted below said first supporting pillar 502, said first supporting pillar 502 being at least partially insertable into said damping seat 504 and slidable therein in a vertical direction, a first damping spring 506 being connected between said damping seat 504 and said base 3;

at least four second buffer assemblies 7 are arranged and evenly arranged along the circumferential direction of the lower surface of the base 3, each second buffer assembly 7 comprises a telescopic arm 702 which is fixed below the base 3 and can be extended and retracted, and a rotating arm 704 which is rotatably connected to the free end of the bottom of the telescopic arm 702, a second buffer spring 708 which is used for providing buffer force when the telescopic arm 702 extends and retracts upwards is arranged on the telescopic arm 702, and the rotating arm 704 is provided with buffer force when the free end of the bottom moves upwards by a third buffer spring 710.

As a further improvement of the present invention, each of the adjusting mechanisms is provided with:

a fixing plate 606 mounted on the body 2;

a plurality of turntables 608 rotatably connected to the fixing plate 606, each of the turntables 608 being driven to rotate by a rotating shaft 8;

a first bump 610 disposed on a surface of the turntable 608;

a second protrusion 612 disposed on the fixing plate 606;

the shifting lever 614 is rotatably connected to the fixing plate 606 through the second convex block 612, a shifting groove 616 parallel to the axis of the shifting lever 614 is arranged on the shifting lever 614, the first convex block 610 is positioned in the shifting groove 616, and a first toothed segment 618 with an arc-shaped end is further arranged at one free end of the shifting lever 614;

a sliding rod 620 slidably connected to the fixing plate 606, wherein an axial direction of the sliding rod 620 is perpendicular to a connection line of the first protrusion 610 and the second protrusion 612;

a second toothed segment 621 fixed on the sliding rod 620 and having a bar-shaped structure, the second toothed segment 621 being parallel to the axis of the sliding rod 620 and engaging with the first toothed segment 618;

a connecting rod 624 for connecting the sliding rods 620 to the first connecting arm 602, wherein the connecting rod 624 is a straight rod or a bent rod, and all the sliding rods 620 are located in the same plane through the connection.

As a further improvement of the present invention, the telescopic arm 702 has:

a first arm 712 fixed to a lower surface of the base 3;

the second arm body 714 is connected below the first arm body 712, the first arm body 712 can at least partially extend into the second arm body 714 and slide therein, the second buffer spring 708 is sleeved on the first arm body 712, two ends of the second buffer spring are respectively limited between an end wall of the second arm body 714 and the first annular baffle at the top of the first arm body 712, a through groove is formed in the bottom of the second arm body 714, and the rotating arm 704 is rotatably connected in the through groove.

As a further improvement of the present invention, the second buffer assembly 7 further includes a second connecting arm 716 rotatably connected to the second arm body 714 and the rotating arm 704 at two ends thereof, the second connecting arm 716 is provided with a third arm body 718 rotatably connected to the second arm body 714, and a fourth arm body 720 rotatably connected to the rotating arm 704, the fourth arm body 720 can be inserted into the third arm body 718 and can slide therein, the third arm body 718 and the fourth arm body 720 are both provided with a second annular baffle, and the third buffer spring 710 is limited in the second annular baffle.

As a further improvement of the present invention, each of the second arm 714 and the rotating arm 704 is provided with two sets of second connecting arms 716 and third buffer springs 710, and the two sets of second connecting arms 716 are symmetrically arranged along the axes of the second arm 714 and the rotating arm 704.

As a further improvement of the present invention, four horizontal first sliding grooves 902 are respectively formed in the lower surface of the base 3 along the circumferential direction, and two adjacent first sliding grooves 616 are vertically arranged;

a first sliding block 904 is arranged in the first sliding groove 616 and can slide in the first sliding groove, the first sliding block 904 is arranged perpendicular to the first sliding groove 616 and is provided with a second sliding groove 906 parallel to the axis of the first sliding groove, and the first arm body 712 is arranged in the second sliding groove 906 and can slide in the second sliding groove.

As a further improvement of the present invention, at least two fixing sleeves 10 are fixed on the machine body 2, the paddle arm 4 is at least partially inserted into a through hole of the fixing sleeves 10, at least one fixing strip 1002 parallel to an axis of the paddle arm 4 is arranged on a hole wall of the through hole, a sliding groove is arranged on the paddle arm 4, and the fixing strip 1002 can slide relatively in the sliding groove.

As a further improvement of the invention, the paddle arms 4 are arranged in four numbers, and the included angles between the four numbers are degrees.

As a further improvement of the present invention, a first sliding slot 616 penetrating through the upper and lower surfaces of the paddle arm 4 is provided, the fixing sleeve 10 is provided with a second sliding slot 906 penetrating through the upper and lower surfaces of the fixing sleeve, the fixing device is a fixing bolt 1202 and a fixing nut 1204, the fixing bolt 1202 penetrates through the first sliding slot 616 and the second sliding slot 906, and the fixing nut 1204 clamps the paddle arm 4 and the fixing sleeve 10.

As a further improvement of the invention, the free end of the bottom of the rotating arm 704 is provided with a universal joint, and the bottom of the universal joint is provided with a roller.

As a further improvement of the present invention, an auxiliary connecting rod 626 is further fixedly connected to the connecting rod 624, and the sliding rod 620 is connected to the connecting arm 602 through the connecting rod 624 or the auxiliary connecting rod 626.

As a further development of the invention, the rotary shaft 8 is fixedly connected to a gear reduction unit, which is driven in rotation by a step motor.

As a further improvement of the invention, a buffer pad is arranged at the bottom of the buffer seat 504.

As a further improvement of the present invention, a box 11 is further disposed below the base 3, and the first buffer component 5 and the second buffer component 7 are located in the box 11 and can partially protrude from the box 11.

First, the telescopic movement of the paddle arm 4:

(1) when the paddle arm 4 needs to be stretched, the fixing bolt 1202 and the fixing nut 1204 are loosened;

(2) the motor rotates, torque is transmitted to the rotating shaft 8 through the gear reducer, and four rotating discs 608 are connected to the rotating shaft 8, so that the rotating discs 608 are driven to rotate simultaneously (of course, the rotating shaft 8 can be driven to rotate manually);

(3) when the turntable 608 rotates, the shifting lever 614 is driven to move, the sliding rod 620 is driven to do reciprocating motion within one circular motion of the shifting lever 614, namely, the shifting lever 614 is driven to do one-way linear motion once the turntable 608 rotates by 180 degrees, and the total distance of the motion is fixed, so that the distance of the sliding rod 620 which does not move by 1 degree can be converted, and finally, the rotating angle of the turntable 608 can be calculated according to the distance of the sliding rod 620 which needs to move;

(4) in the present invention, four paddle arms 4 are arranged in the same horizontal plane, but since the rotating disc 608 cannot be located in the same horizontal plane, a connecting rod 624 of a straight rod structure and a connecting rod 624 of a bent rod structure need to be arranged, wherein one sliding rod 620 is connected with the connecting rod 624 of the straight rod structure, and the other three sliding rods 620 are connected with the connecting rod 624 of the bent rod structure, so as to ensure that the four paddle arms 4 are located in the same plane;

(5) after moving into position, the fixing bolt 1202 and the fixing nut 1204 are tightened.

Secondly, buffering of the base 3:

(1) when the unmanned aerial vehicle lands, the buffer seat 504 in the first buffer assembly 5 is firstly contacted with the ground, the bottom of the buffer seat 504 is provided with a rubber buffer cushion which can firstly play a part of shock absorption function, after the buffer seat 504 is contacted with the ground, the ground provides an upward acting force for the buffer seat 504, the buffer seat 504 slides upwards relative to the first support column 502, the first buffer spring 506 is compressed to generate elastic deformation, so that the buffer function is played, and the spring force of the first buffer spring 506 ensures that the buffer seat 504 is not contacted with the bottom of the base 3;

(2) thereafter, the second damping assembly 7 is in contact with the ground, which contact of the second damping assembly 7 with the ground will result in three movements:

a. firstly, the rotating arm 704 is driven to rotate around the second arm body 714, and the bottom of the rotating arm 704 is spread outwards at the time, because the bottom of the rotating arm 704 is provided with a universal joint and a roller, the friction force with the ground is small at the time, and the rotating motion of the rotating arm 704 is buffered by the third buffer spring 710;

b. when the rotating arm 704 moves to the maximum limit, the force applied to the rotating arm 704 by the ground will be divided into a first component force directed vertically upwards and a second component force directed horizontally outwards, and the first component force will make the second arm 714 move upwards relative to a first arm 712, thereby compressing the second spring and playing a role of buffering;

c. the second component force drives the first arm 712 to slide in the second sliding groove and the first sliding block 904 to slide in the first sliding groove 902, so as to be expanded outwards;

the technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.