A fixed-wing drone landing gear

Abstract

The application relates to the field of unmanned planes, in particular to a fixed-wing unmanned plane landing gear. The current unmanned plane landing gear is inconvenient to install, has large inertia during landing, is not stable enough during landing, and has the defect of large site limitation. The fixed-wing unmanned plane landing gear comprises a frame body and the like; a bottom plate is fixedly connected to the frame body; two fixed shafts are fixedly connected to the bottom plate and are symmetrically arranged. After the unmanned plane takes off, four electric push rods drive the landing wheels to be retracted; when the unmanned plane lands, the buffer springs buffer the inertial force of the unmanned plane, the landing gear can be quickly installed and dismounted, the unmanned plane is more convenient to assemble, the situation that the landing gear is loosened due to accidental touch of the turntable is prevented, after the unmanned plane takes off, the four landing wheels can be retracted, air resistance during flight of the unmanned plane is reduced, and flight efficiency and performance are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of unmanned aerial vehicle, especially to a fixed-wing unmanned aerial vehicle landing gear. BACKGROUND

[0002] Fixed-wing unmanned aerial vehicle (Fixed-Wing UAV) is a kind of unmanned aerial vehicle with fixed wing shape, which is composed of fuselage, wing, tail, propulsion system and landing gear. The landing gear of the unmanned aerial vehicle is an important part of its structure, especially for the fixed-wing unmanned aerial vehicle, which not only affects the take-off and landing performance of the unmanned aerial vehicle, but also relates to the safety and convenience of ground operation.

[0003] However, the current unmanned aerial vehicle landing gear installs the fixed wheel type landing gear through the bolt mechanism to support the weight of the unmanned aerial vehicle on the ground, and helps it to realize safe landing through elastic material. The installation process is relatively cumbersome and inconvenient. The inertia of the unmanned aerial vehicle is large when landing, the landing is not stable enough, and the site is limited, which requires a large site to provide buffer deceleration for the unmanned aerial vehicle. SUMMARY

[0004] In view of the above shortcomings or deficiencies of the prior art, the present application provides a fixed-wing unmanned aerial vehicle landing gear, which can quickly install and disassemble the landing gear, making the unmanned aerial vehicle assembly more convenient, and also making the unmanned aerial vehicle landing more stable, optimizing the take-off and landing distance, and reducing the limitation of the site on the unmanned aerial vehicle.

[0005] A fixed-wing unmanned aerial vehicle landing gear, comprising a frame body, a bottom plate fixedly connected to the frame body, two fixed shafts fixedly connected to the bottom plate, the two fixed shafts being symmetrically arranged, two pulley frames rotatably arranged on each of the two fixed shafts, the two pulley frames on the same fixed shaft forming a group, an installation block slidably connected to the pulley frame, a buffer spring one connected between the pulley frame and the installation block, the buffer spring one being sleeved on the pulley frame, a landing wheel rotatably connected to the installation block, a quick assembly and disassembly assembly arranged on the frame body, and a wheel frame folding and unfolding assembly arranged on the bottom plate.

[0006] As a preferred technical scheme of the present application, the quick assembly and disassembly component comprises inclined blocks, four of the inclined blocks are slidably connected to the frame body, connecting pipes are fixedly connected to the four inclined blocks, two of the connecting pipes that are close to each other form a group, two of the inclined blocks connected by two of the connecting pipes in the same group form a group, a middle shaft is slidably connected between two of the connecting pipes in the same group, a return spring is connected between the middle shaft and two of the connecting pipes in the same group, the return spring is sleeved on the middle shaft, two connecting frames are fixedly connected between two groups of the inclined blocks, the two connecting frames are symmetrically arranged, arc-shaped guide rods are fixedly connected to the two connecting frames, a groove disc is rotatably connected to the frame body, the groove disc is provided with an embedded clamping groove and two arc-shaped grooves, bottom ends of the two arc-shaped guide rods are located in the two arc-shaped grooves on the groove disc, the groove disc is rotatably connected to the bottom plate, a sliding shaft is slidably sleeved on the groove disc, an embedded clamping block is fixedly connected to the top of the sliding shaft, the embedded clamping block is located in the same vertical direction as the embedded clamping groove on the groove disc, a ring pad is rotatably connected in the groove disc, the sliding shaft penetrates through the ring pad, a rotating spring is connected between the ring pad and the top of the inner wall of the groove disc, the rotating spring is sleeved on the sliding shaft, a rotating disc is fixedly connected to the bottom of the sliding shaft, the rotating disc is provided with a plurality of finger grooves, and a drone mounting frame is clamped between two groups of the inclined blocks.

[0007] As a preferred technical scheme of the present application, the wheel frame folding and unfolding assembly comprises rotating bases one, two of the pulley frames in the same group are fixedly connected with the rotating bases one, four rotating bases two are fixedly connected to the bottom plate, short connecting rods are rotatably connected to the four rotating bases one, rotating shafts are rotatably connected to the four short connecting rods, long connecting rods are rotatably connected to the four rotating bases two, the long connecting rods are rotatably connected with the rotating shafts, annular sleeves are rotatably connected to the rotating shafts, four electric push rods are fixedly connected to the frame body, and the telescopic rods of the electric push rods are fixedly connected with the annular sleeves.

[0008] As a preferred technical scheme of the present application, the buffer deceleration assembly is arranged on the mounting block, the buffer deceleration assembly comprises trapezoidal frames, two trapezoidal frames are fixedly connected to the top of each of the four mounting blocks, two trapezoidal frames on the same mounting block form a group, a buffer base is fixedly connected to the top of each trapezoidal frame, two buffer bases are fixedly connected to each of the four pulley frames, two buffer bases in the same vertical direction form a group, two buffer connecting rods are rotatably connected to each of the two buffer bases in the same group, two buffer connecting rods on the same buffer base form a group, the two groups of buffer connecting rods on the two buffer bases in the same group are rotatably connected, a shock-absorbing pipe and a sliding rod are fixedly connected to each of the two buffer bases in the same group, the sliding rod is slidably connected to the shock-absorbing pipe, a buffer spring two is connected between the shock-absorbing pipe and one of the buffer bases, the buffer spring two is sleeved on the sliding rod, a connecting rod is fixedly connected to the bottom of each of the four sliding rods, two inclined blocks are fixedly connected to the bottom of each of the four connecting rods, two inclined blocks on the same connecting rod form a group, the two inclined blocks in the same group are arranged in a staggered manner, four inclined chute plates are slidably connected to the two groups of trapezoidal frames, guide inclined chutes are formed in the inclined chute plates, two inclined chute plates on the same trapezoidal frame form a group, the two inclined blocks in the same group are located in the guide inclined chutes of the two inclined chute plates in the same group, respectively, two brake pads are fixedly connected between the two groups of inclined chute plates, the two brake pads are symmetrically arranged, and two brake pads on the same mounting block form a group.

[0009] Compared with the prior art, the present application has the following advantages: first, the staff aligns the two groups of inclined clamping blocks with the two limiting clamping grooves on the unmanned aerial vehicle mounting frame respectively, then presses the unmanned aerial vehicle mounting frame, and the installation of the landing gear is completed; when the unmanned aerial vehicle takes off, the four electric push rods drive the landing wheels to be retracted; when the unmanned aerial vehicle lands, the electric push rods drive the landing wheels to swing downward and reset; when the unmanned aerial vehicle lands, the buffer spring one buffers the inertial force of the unmanned aerial vehicle; after the unmanned aerial vehicle is used, the staff rotates the turntable, removes the landing gear, and loosens the turntable; in this way, the landing gear can be quickly installed and disassembled, the unmanned aerial vehicle is more convenient to assemble, and the situation that the landing gear is loosened due to accidental touch of the turntable is prevented; after the unmanned aerial vehicle takes off, the four landing wheels can be retracted, the air resistance of the unmanned aerial vehicle during flight is reduced, and the flight efficiency and performance are improved.

[0010] When the unmanned aerial vehicle lands, the two groups of brake pads are in contact with two landing wheels respectively, so that the landing wheels are decelerated through the friction between the brake pads and the landing wheels, when the unmanned aerial vehicle slows down, the brake pads are out of contact with the landing wheels, so that the inertia force during landing of the unmanned aerial vehicle can be further buffered, the landing speed of the unmanned aerial vehicle can be further decelerated, so that the unmanned aerial vehicle lands more stably, the take-off and landing distance can be optimized, and the limitation of the site on the unmanned aerial vehicle is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The schematic diagram of the three-dimensional structure of the application.

[0012] Figure 2 The schematic diagram of the three-dimensional structure of the unmanned aerial vehicle mounting frame of the application.

[0013] Figure 3 The schematic diagram of the three-dimensional structure of the rotary disc of the application.

[0014] Figure 4 The application Figure 3 The schematic diagram of the three-dimensional structure of the enlarged A.

[0015] Figure 5 The schematic diagram of the three-dimensional structure of the wheel frame folding and unfolding assembly of the application.

[0016] Figure 6 The application Figure 5 The schematic diagram of the three-dimensional structure of the enlarged B.

[0017] Figure 7 The schematic diagram of the first partial cross-sectional three-dimensional structure of the quick mounting and dismounting assembly of the application.

[0018] Figure 8 The schematic diagram of the partial exploded three-dimensional structure of the buffer and deceleration assembly of the application.

[0019] Figure 9 The schematic diagram of the second partial cross-sectional three-dimensional structure of the quick mounting and dismounting assembly of the application.

[0020] The marks in the drawings are: 1-frame, 2-bottom plate, 3-fixed shaft, 31-pulley frame, 32-mounting block, 33-buffer spring one, 34-lifting wheel, 41-inclined block, 42-connection pipe, 43-middle shaft, 44-reset spring, 45-connection frame, 46-arc surface guide rod, 47-groove disc, 471-sliding shaft, 472-embedded block, 473-ring pad, 474-rotation spring, 48-rotating disc, 5-drone mounting frame, 61-rotating base one, 62-rotating base two, 63-short connecting rod, 64-rotation shaft, 65-long connecting rod, 66-annular sleeve, 67-electric push rod, 71-trapezoidal frame, 72-buffer base, 73-buffer connecting rod, 74-damping pipe, 75-sliding rod, 76-buffer spring two, 761-connection rod, 77-inclined block, 78-inclined groove plate, 79-brake pad. DETAILED DESCRIPTION

[0021] The standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description and drawings. The specific connection mode of each part adopts the conventional means such as bolt, rivet, welding, and sticking in the prior art, which will not be described in detail here.

[0022] Example 1

[0023] A fixed-wing unmanned aerial vehicle landing gear, as shown in Figures 1-9 It comprises a frame 1, a bottom plate 2 is welded on the frame 1, two fixed shafts 3 are fixedly connected on the bottom plate 2, the two fixed shafts 3 are symmetrically arranged, two pulley frames 31 are rotatably arranged on the two fixed shafts 3, the two pulley frames 31 on the same fixed shaft 3 form a group, a mounting block 32 is slidably connected on the pulley frame 31, a buffer spring one 33 is connected between the pulley frame 31 and the mounting block 32 through a hook, the buffer spring one 33 is sleeved on the pulley frame 31, a lifting wheel 34 is rotatably connected on the mounting block 32, a quick mounting and dismounting assembly is arranged on the frame 1, and a wheel frame folding and unfolding assembly is arranged on the bottom plate 2.

[0024] The quick assembly and disassembly assembly comprises inclined blocks 41, four inclined blocks 41 are slidably connected to the frame body 1, connecting pipes 42 are welded on the four inclined blocks 41, two connecting pipes 42 close to each other form a group, two inclined blocks 41 connected by two connecting pipes 42 in the same group form a group, a middle shaft 43 is slidably connected between two connecting pipes 42 in the same group, the middle shaft 43 and the two connecting pipes 42 in the same group are connected by hooks and provided with reset springs 44, the reset springs 44 are sleeved on the middle shaft 43, two connecting frames 45 are connected between the two groups of inclined blocks 41 by bolts, the two connecting frames 45 are symmetrically arranged, arc guide rods 46 are welded on the two connecting frames 45, a groove disc 47 is rotatably connected to the frame body 1, the groove disc 47 is provided with embedded clamping grooves and two arc grooves, the bottom ends of the two arc guide rods 46 are located in the two arc grooves on the groove disc 47, the groove disc 47 is rotatably connected with the bottom plate 2, a sliding shaft 471 is slidably sleeved on the groove disc 47, an embedded clamping block 472 is connected to the top of the sliding shaft 471 by bolts, the embedded clamping block 472 is in the same vertical direction as the embedded clamping grooves on the groove disc 47, a ring pad 473 is rotatably connected in the groove disc 47, the sliding shaft 471 passes through the ring pad 473, a rotating spring 474 is connected between the ring pad 473 and the top of the inner wall of the groove disc 47 by hooks, the rotating spring 474 is sleeved on the sliding shaft 471, a turntable 48 is connected to the bottom of the sliding shaft 471 by bolts, the turntable 48 is provided with a plurality of finger grooves, and a drone mounting frame 5 is clamped between the two groups of inclined blocks 41.

[0025] The wheel frame folding and unfolding assembly comprises rotating bases one 61, rotating bases one 61 are welded on the two pulley frames 31 in the same group, four rotating bases two 62 are welded on the bottom plate 2, short connecting rods 63 are rotatably connected to the four rotating bases one 61, rotating shafts 64 are rotatably connected to the four short connecting rods 63, long connecting rods 65 are rotatably connected to the four rotating bases two 62, the long connecting rods 65 are rotatably connected with the rotating shafts 64, annular sleeves 66 are rotatably connected to the rotating shafts 64, four electric push rods 67 are connected to the frame body 1 by bolts, and the telescopic rods of the electric push rods 67 are fixedly connected with the annular sleeves 66.

[0026] Firstly, the staff will align two sets of inclined blocks 41 respectively on the two limiting slots on the unmanned aerial vehicle mounting rack 5, and then press the unmanned aerial vehicle mounting rack 5, the unmanned aerial vehicle mounting rack 5 will extrude the two inclined blocks 41 in the same group to move towards each other, the movement of the two sets of inclined blocks 41 will jointly drive the two connecting frames 45 and the two arc guide rods 46 to move towards each other, the two arc guide rods 46 will extrude the groove disc 47, the sliding shaft 471 and the rotating disc 48 to rotate, the movement of the two inclined blocks 41 in the same group will also drive the two connecting pipes 42 in the same group to move towards each other, the reset spring 44 will be compressed, when the two sets of inclined blocks 41 are respectively clamped into the two limiting slots on the unmanned aerial vehicle mounting rack 5, the reset spring 44 will reset, the reset of the reset spring 44 will drive the two connecting frames 45 and the two arc guide rods 46 to move away from each other, the reset of the two arc guide rods 46 will extrude the groove disc 47 and the rotating disc 48 to rotate in the opposite direction, the reset of the two connecting frames 45 will drive the two sets of inclined blocks 41 to move away from each other, thereby completing the installation of the landing gear, when the unmanned aerial vehicle takes off, the four electric push rods 67 will be started at the same time, the contraction of the telescopic rod of the electric push rod 67 will drive the annular sleeve 66 to move upwards, the upward movement of the annular sleeve 66 will drive the rotating shaft 64 to move upwards, the upward movement of the rotating shaft 64 will drive the short connecting rod 63 and the long connecting rod 65 to swing, the upward swing of the short connecting rod 63 will drive the pulley frame 31 to swing upwards, the upward swing of the wheel frame will drive the mounting block 32, the buffer spring one 33 and the landing wheel 34 to swing upwards, thereby folding the landing wheel 34, when the unmanned aerial vehicle lands, the electric push rod 67 will drive the landing wheel 34 to swing downwards, the buffer spring one 33 will buffer the inertial force of the unmanned aerial vehicle when the unmanned aerial vehicle lands, when the unmanned aerial vehicle is used, the staff will press the rotating disc 48 to move upwards, the upward movement of the rotating disc 48 will drive the sliding shaft 471 to move upwards, the upward movement of the sliding shaft 471 will drive the embedded block 472 to move upwards, the rotating spring 474 will be compressed, the embedded block 472 will be clamped into the embedded slot on the groove disc 47, then the staff will rotate the rotating disc 48, the rotation of the rotating disc 48 will drive the sliding shaft 471, the embedded block 472 and the groove disc 47 to rotate, the rotation of the groove disc 47 will extrude the two arc guide rods 46 to move towards each other, the movement of the two arc guide rods 46 will drive the two connecting frames 45, the two sets of inclined blocks 41 and the two sets of connecting pipes 42 to move towards each other, the reset spring 44 will be compressed again, then the staff will remove the landing gear and release the rotating disc 48, the reset spring 44 will reset again, the reset of the reset spring 44 will drive the two sets of inclined blocks 41 to reset, the rotating spring 474 will reset, the reset of the rotating spring 474 will drive the rotating disc 48, the sliding shaft 471 and the embedded block 472 to move downwards, the embedded block 472 will be out of contact with the groove disc 47, in this way, the landing gear can be quickly installed and disassembled, making the unmanned aerial vehicle assembly more convenient,It can also prevent the landing gear from loosening due to accidental contact with the turntable 48. After the drone takes off, the four landing wheels 34 can be retracted to reduce the air resistance of the drone during flight and improve flight efficiency and performance.

[0027] Example 2

[0028] On the basis of Example 1, Figures 4-8 As shown, a buffer deceleration assembly is also included, which is arranged on the mounting block 32. The buffer deceleration assembly includes a ladder frame 71. The tops of the four mounting blocks 32 are connected to two ladder frames 71 by bolts. The two ladder frames 71 located on the same mounting block 32 are a group. The top of each ladder frame 71 is connected to a buffer base 72 by bolts. The four pulley frames 31 are connected to two buffer bases 72 by bolts. The two buffer bases 72 located in the same vertical direction are a group. The two buffer bases 72 of the same group are rotatably connected to two buffer links 73. The two buffer links 73 located on the same buffer base 72 are a group. The two groups of buffer links 73 on the two buffer bases 72 of the same group are rotatably connected. Shock absorber tubes 74 and slide rods 75 are respectively welded on the two buffer bases 72 of the same group. The slide rods 75 and the shock absorber tubes 74 are slidable. The two cam plates 78 are connected to each other in a sliding manner, and the two cam plates 78 are arranged in a staggered manner.

[0029] When the drone lands, the four pulley frames 31 will move downward under the action of inertia. The downward movement of the pulley frame 31 will drive two of the buffer bases 72 to move downward. The downward movement of the buffer base 72 will drive the slide bar 75 to move downward. The buffer spring 76 will be compressed. The downward movement of the slide bar 75 will drive the connecting rod 761 to move downward. The downward movement of the connecting rod 761 will drive the two inclined plane blocks 77 of the same group to move downward. The downward movement of the two inclined plane blocks 77 of the same group will squeeze the two inclined slot plates 78 of the same group to move away from each other. The movement of the two groups of inclined slot plates 78 will drive the two brake pads 79 of the same group to move away from each other. The two groups of brake pads 79 will respectively contact two of the landing wheels 34, thereby connecting the brake pads 79 to the landing wheels 34. The friction between the two groups of inclined slot plates 78 will drive the two brake pads 79 to move toward each other and reset, and the brake pads 79 will be out of contact with the landing wheel 34. In this way, the inertial force of the drone during landing can be further buffered, and the landing speed of the drone can be braked and decelerated, so that the drone can land more smoothly, optimize the take-off and landing distances, and reduce the restrictions of the site on the drone.

[0030] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixed-wing UAV landing gear, characterized by: The invention comprises a frame (1), wherein the frame (1) is fixedly connected to a bottom plate (2), and the bottom plate (2) is fixedly connected to two fixed shafts (3), the two fixed shafts (3) are symmetrically arranged, and the two fixed shafts (3) are rotatably connected to two pulley frames (31), and the two pulley frames (31) located on the same fixed shaft (3) form a group, and the pulley frame (31) is slidably connected to a mounting block (32), and a buffer spring (33) is connected between the pulley frame (31) and the mounting block (32), and the buffer spring (33) is sleeved on the pulley frame (31), and the mounting block (32) is rotatably connected to a lifting wheel ( 34), a quick-loading and disassembly assembly is provided on the frame (1), and a wheel frame retracting and releasing assembly is provided on the bottom plate (2); the quick-loading and disassembly assembly includes an inclined surface block (41), four inclined surface blocks (41) are slidably connected to the frame (1), and the four inclined surface blocks (41) are fixedly connected to a connecting pipe (42), two connecting pipes (42) close to each other form a group, and two inclined surface blocks (41) respectively connected to two connecting pipes (42) in the same group form a group, and a central axis (43) is slidably connected between the two connecting pipes (42) in the same group, and the central axis (43) is fixed to the two connecting pipes (42) in the same group. A return spring (44) is connected between the two groups of the inclined surface blocks (41), and the return spring (44) is sleeved on the central axis (43). Two connecting frames (45) are fixedly connected between the two groups of the inclined surface blocks (41). The two connecting frames (45) are symmetrically arranged. The two connecting frames (45) are fixedly connected to the arc guide rods (46). The frame body (1) is rotatably connected to a slot plate (47). The slot plate (47) is provided with an embedded slot and two arc grooves. The bottom ends of the two arc guide rods (46) are respectively located in the two arc grooves on the slot plate (47). The slot plate (47) is rotatably connected to the bottom plate (2). The slot plate (47) is slidably sleeved. A sliding shaft (471) is connected, and an embedded card block (472) is fixedly connected to the top of the sliding shaft (471), and the embedded card block (472) and the embedded card slot on the slot disk (47) are located in the same vertical direction. A ring washer (473) is rotatably connected inside the slot disk (47), and the sliding shaft (471) passes through the ring washer (473). A rotation spring (474) is connected between the ring washer (473) and the top of the inner wall of the slot disk (47), and the rotation spring (474) is sleeved on the sliding shaft (471). A turntable (48) is fixedly connected to the bottom of the sliding shaft (471), and a drone mounting frame (5) is clamped between the two groups of the inclined card blocks (41).

2. The fixed-wing UAV landing gear according to claim 1, characterized in that: The rotating disk (48) is provided with a plurality of finger grooves.

3. The fixed-wing UAV landing gear according to claim 1, characterized in that: Two limit slots are provided on the drone mounting frame (5), and the top ends of the two groups of inclined surface blocks (41) are respectively located in the two limit slots on the drone mounting frame (5).

4. The fixed-wing UAV landing gear according to claim 1, characterized in that: The wheel frame retracting and extending assembly includes a rotating base (61), two pulley frames (31) in the same group are fixedly connected to the rotating base (61), four rotating bases (62) are fixedly connected to the bottom plate (2), the four rotating bases (61) are rotatably connected to short connecting rods (63), the four short connecting rods (63) are rotatably connected to a rotating shaft (64), the four rotating bases (62) are rotatably connected to long connecting rods (65), the long connecting rods (65) are rotatably connected to the rotating shaft (64), the rotating shaft (64) is rotatably connected to an annular sleeve (66), the frame body (1) is fixedly connected to four electric push rods (67), and the telescopic rods of the electric push rods (67) are fixedly connected to the annular sleeve (66).

5. The fixed-wing UAV landing gear according to claim 1, characterized in that: The buffer deceleration assembly is also included, and the buffer deceleration assembly is arranged on the mounting block (32). The buffer deceleration assembly includes a ladder frame (71), and the tops of the four mounting blocks (32) are fixedly connected to two of the ladder frames (71). The two ladder frames (71) located on the same mounting block (32) form a group, and the top of each ladder frame (71) is fixedly connected to a buffer base (72). The four pulley frames (31) are fixedly connected to two buffer bases (72), and the four pulley frames (31) are located in the same vertical direction. Two buffer bases (72) form a group, and the two buffer bases (72) of the same group are rotatably connected to two buffer connecting rods (73). The two buffer connecting rods (73) located on the same buffer base (72) form a group, and the two groups of buffer connecting rods (73) on the two buffer bases (72) of the same group are rotatably connected. The two buffer bases (72) of the same group are respectively fixedly connected to a shock absorbing tube (74) and a sliding rod (75). The sliding rod (75) and the shock absorbing tube (74) are slidably connected. A second buffer spring (76) is connected between the shock-absorbing tube (74) and one of the buffer bases (72). The second buffer spring (76) is sleeved on the slide rod (75). The bottoms of the four slide rods (75) are fixedly connected to a connecting rod (761). The bottoms of the four connecting rods (761) are fixedly connected to two inclined plane blocks (77). The two inclined plane blocks (77) on the same connecting rod (761) form a group. The two inclined plane blocks (77) in the same group are staggered. The two groups of ladder frames ( Four inclined slot plates (78) are slidably connected on each of the two inclined slot plates (71), and the inclined slot plates (78) are provided with guide inclined slots. Two inclined slot plates (78) located on the same ladder frame (71) form a group, and the two inclined surface blocks (77) of the same group are respectively located in the guide inclined slots on the two inclined slot plates (78) of the same group. Two brake pads (79) are fixedly connected between the two groups of inclined slot plates (78), and the two brake pads (79) are symmetrically arranged. The two brake pads (79) located on the same mounting block (32) form a group.

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