CN112438245A

CN112438245A - Self-propelled spraying insecticide sprayer for walnut forest

Info

Publication number: CN112438245A
Application number: CN202011424513.7A
Authority: CN
Inventors: 马佳乐; 王佳丽; 唐玉荣; 张永成; 兰海鹏; 刘扬; 张宏; 廖结安; 张锐; 高山; 李龙
Original assignee: Tarim University
Current assignee: Tarim University
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-03-05

Abstract

The utility model provides a self-propelled spraying laxative machine of walnut forest, including first pivot, there is regular triangle board in the first pivot, there is the sleeve pipe in the first pivot, there is the annular groove on the sleeve pipe, there is the annular block in the annular groove, there is the spheroid on the annular block, there is the opening annular groove side, there is the motor in the opening, there is level sensor on the sleeve pipe, there is the tourus on the sleeve pipe lateral wall, tourus lateral surface has first connecting rod, first connecting rod one end is through first axle sleeve connection second connecting rod, there is the supporting shoe first axle sleeve side, there is hydraulic telescoping rod between the supporting shoe, second connecting rod one end has the second pivot, there is the power wheel in the second pivot, first axle sleeve side has the third axle sleeve, it spouts medicine mechanism to have the medicine mechanism, spout the last power of medicine mechanism, controller and signal receiver, be equipped with the remote controller. According to the invention, through the swinging and movement of the regular triangle plate and the first rotating shaft, the loose and wet walnut forest land pavement can be overcome, the spraying height and the spraying area of the spraying mechanism to the medicine can be increased, and the large-scale dynamic spraying can be carried out.

Description

Self-propelled spraying insecticide sprayer for walnut forest

Technical Field

The invention belongs to the field of walnut forest pesticide spraying equipment, and particularly relates to a self-propelled type spraying pesticide sprayer for walnut forests.

Background

Walnut trees are native to middle-asian zones and are planted in various places in China, the walnut trees are suitable for ecological environments with deep, loose, fertile, humid and warm and cool climate, the trunks of the finished trees are different in variety, the height of the finished trees is generally two to ten meters, the walnut plant diseases and insect pests are greatly harmful to the planting, the yield, the quality and the tree health are influenced, the tree bodies die in serious cases, common main diseases comprise anthracnose which harms fruits and leaves, dead branch disease which harms branches, Yunnan longicorn pest which harms trunks and the like, based on various plant diseases and insect pests, the prior spraying prevention is mainly adopted, and the symptomatic pesticide application is carried out on different harmful parts, the existing spraying of walnut forests is generally carried out by manual pesticide spraying, not only needs to be mixed with medicines, but also needs to be sprayed by manpower, the manpower resource is consumed, the spraying range is small, the efficiency is low, and the common pesticide spraying machine is difficult to be competent for automatic pesticide spraying operation with various heights, and the self-propelled spraying insecticide machine for walnut trees is difficult to move in loose and moist lands in walnut trees and is easy to slip, and is designed aiming at the problems.

Disclosure of Invention

The invention provides a self-propelled spraying insecticide sprayer for walnut forests, which is used for overcoming the defects in the prior art.

The invention is realized by the following technical scheme:

a self-propelled spraying insecticide sprayer for walnut forest comprises a first rotating shaft facing forwards and backwards, wherein the front end and the rear end of the first rotating shaft are respectively provided with a regular triangle plate, the gravity center position of one side, opposite to the two regular triangle plates, is respectively fixedly connected with the front end and the rear end of the first rotating shaft, the two regular triangle plates are symmetrical relative to the geometric center of the first rotating shaft, the middle part of the first rotating shaft is sleeved with a sleeve, the middle part of the inner side surface of the sleeve is provided with a ring groove coaxial with the sleeve, a ring block is rotatably installed in the ring groove through a bearing, the inner side surface of the ring block is a spherical surface, the inner side surface of the ring block is provided with a sliding groove in the front and rear direction of the spherical surface, a sliding block is installed in the sliding groove in a matched manner, the middle part of the ring block is in, the middle part of the side surface of the ring groove is provided with an opening, a motor is fixedly arranged in the opening, a gear is fixedly sleeved on an output shaft of the motor and is meshed with teeth on the outer side surface of the ring block, a level sensor is fixedly arranged at the top of the sleeve, the left side and the right side of the front part and the rear part of the inner wall of the sleeve are respectively provided with an expanded groove, the cross section of the inner part of the sleeve is in a hourglass shape, the longitudinal section of the inner part of the sleeve is in a rectangular shape, two coaxial ring bodies are rotatably connected onto the outer side wall of the sleeve, the outer side surfaces of the two ring bodies are respectively and fixedly connected with two transverse first connecting rods, the far ends of the two first connecting rods are respectively and rotatably connected with two transverse second connecting rods through first shaft sleeves, supporting blocks are fixedly arranged on the lower part of the side surface of the first shaft sleeves, a, second pivot middle part all is overlapped and is equipped with the second shaft cover, the second shaft cover respectively with the one end fixed connection that corresponds of second connecting rod, the equal fixed mounting in second pivot both ends has the power wheel, the front and back portion of first pivot side is rotated and is connected with the third axle sleeve, third axle sleeve top is connected with through the bracing piece and spouts medicine mechanism, spout the last fixed mounting of medicine mechanism and have the power, controller and signal receiver, power and controller and spout medicine mechanism, level sensor, hydraulic telescoping rod, the power wheel, signal receiver links to each other, it uses with signal receiver cooperation to be equipped with the remote controller in addition.

As above self-propelled spraying laxative machine in walnut woods, spout medicine mechanism include the backup pad that bottom and bracing piece are connected, the backup pad bottom links to each other with first axle sleeve through bearing structure, backup pad top surface fixed mounting has upper portion open-ended fixed box, install flourishing explosive barrel in the fixed box, keep apart for several flourishing explosive zone in the flourishing explosive barrel, spray the position according to the difference in the flourishing explosive zone and contain different medicines, all be equipped with the liquid pump in every flourishing explosive zone, flourishing explosive barrel top is installed two shower nozzles towards the fore-and-aft direction respectively, the shower nozzle passes through the pipe intercommunication with the liquid pump in every flourishing explosive zone respectively, flourishing explosive barrel top fixed mounting has the power, controller and signal receiver, the power, the controller links to each other with the liquid pump.

According to the self-propelled spraying insecticide sprayer for walnut forests, the top points of the corners of the regular triangle plates are chamfered with round corners, and the side surfaces of all the sides of the regular triangle plates are chamfered with arc surfaces.

According to the self-propelled spraying insecticide sprayer for walnut forests, the spray head is an atomizing spray head.

According to the self-propelled spraying insecticide sprayer for walnut forests, the supporting structure comprises a ball shaft with ball heads at two ends, and two ends of the ball shaft are respectively connected with the ball heads on the top surface of the first shaft sleeve and the bottom surface of the supporting plate.

The invention has the advantages that: when the walnut tree harvester runs on a common flat ground, as shown in fig. 4, the controller controls the four power wheels to rotate and advance, the hydraulic telescopic rod controls the two first connecting rods to keep a certain included angle, so that the sleeve cannot swing back and forth in the running process, after the walnut tree harvester enters a walnut forest land, the walnut tree harvester runs between two rows of walnut trees, the controller controls the hydraulic telescopic rod to extend until the two first connecting rods are positioned on the same horizontal line, as shown in fig. 2, the two regular triangular plates always keep a relative twisting angle of sixty degrees, and partial corners of the two regular triangular plates are always in contact with the ground, at the moment, because the heights of the centers of gravity of the two regular triangular plates from the ground are different and constantly change, the two ends of the first rotating shaft connected with the regular triangular plates deflect in multiple directions, and the motion track of the first rotating shaft is approximately in a horizontal hourglass shape; when the front end and the rear end of the first rotating shaft perform reciprocating swing in the vertical direction around the sphere, the first connecting rod performs reciprocating swing in the front-rear direction around the axis of the first connecting rod along with the sleeve; when the front end and the rear end of the first rotating shaft perform reciprocating swing around the ball body in the left-right direction, the first rotating shaft can move along the widened groove which is arranged in a matching way, so that the front end and the rear end of the first rotating shaft perform reciprocating swing around the ball body in the left-right direction in the sleeve, the spherical groove is matched with the ball body, the first rotating shaft can not only ensure that the first rotating shaft does not move in the front-rear direction, but also is beneficial to the reciprocating swing motion of the two ends of the first rotating shaft around the ball body, because the pesticide spraying mechanism is connected with the first rotating shaft through the third shaft sleeve and the supporting rod, the pesticide spraying mechanism is driven to synchronously swing in the swinging process of the first rotating shaft, the pesticide spraying mechanism simultaneously performs left-right swing in the front-rear swinging process, when the pesticide spraying mechanism swings, the pesticide liquid in the pesticide spraying mechanism is mixed, the spraying angle is increased, the spraying area is enlarged, the device has the advantage of being not easy to slip, when the walnut forest is about to run out after spraying medicine, a user sends a signal to the signal receiver by using the remote controller and transmits the signal to the controller, at the moment, after the controller receives a horizontal state signal of the horizontal sensor in any state, the first rotating power device is controlled to stop working, the hydraulic telescopic rod is controlled to be shortened, the regular triangle plate is lifted and separated from the ground, meanwhile, the sleeve is locked by the two inclined first connecting rods and the ring body, so that the sleeve cannot swing, but the medicine spraying mechanism can still swing left and right along with the two ends of the first rotating shaft in the advancing process, and medicine mixing is facilitated; the walnut forest land spraying device is ingenious in structure and reasonable in design, loose and wet walnut forest land pavements can be overcome, the spraying height and the spraying area of the spraying mechanism to the medicine can be increased, dynamic spraying is conducted in a large range, the working efficiency is improved, and manpower resources are saved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention; FIG. 2 is a walnut forest land driving state diagram of the invention; FIG. 3 is a view taken along line A of FIG. 1; FIG. 4 is a view showing a general flat ground running state according to the present invention; FIG. 5 is a cross-sectional view of a pipe sleeve; FIG. 6 is a longitudinal cross-sectional view of the bushing; FIG. 7 is a state diagram of the motion of the present invention; fig. 8 is an enlarged view of a portion I of fig. 2.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A self-propelled spraying insecticide sprayer for walnut forest comprises a first rotating shaft 1 facing front and back, wherein the front end and the back end of the first rotating shaft 1 are respectively provided with a regular triangle plate 2, the gravity center position of one side, opposite to the two regular triangle plates 2, is respectively fixedly connected with the front end and the back end of the first rotating shaft 1, the two regular triangle plates 2 are symmetrical relative to the geometric center of the first rotating shaft 1, the middle part of the first rotating shaft 1 is sleeved with a sleeve 3, the middle part of the inner side surface of the sleeve 3 is provided with an annular groove 5 coaxial with the sleeve 3, an annular block 99 is rotatably arranged in the annular groove 5 through a bearing, the inner side surface of the annular block 99 is a spherical surface, the inner side surface of the annular block 99 is provided with a sliding groove 98 along the front-back direction of the spherical surface, a sliding block 97 is arranged in the sliding groove 98 in a matched, the middle part of the side surface of the first rotating shaft 1 is fixedly connected with the inner side surface of the through hole 7, the outer side surface of the annular block 99 is provided with a ring of teeth 90, the middle part of the side surface of the annular groove 5 is provided with a through hole 95, a motor 94 is fixedly arranged in the through hole 95, an output shaft of the motor 94 is fixedly sleeved with a gear 89, the gear 89 is meshed with the teeth 90 on the outer side surface of the annular block 99, the top of the sleeve 3 is fixedly provided with a level sensor 25, the front and back parts of the inner wall of the sleeve 3 are provided with widened grooves 4, the cross section of the inner part of the sleeve 3 is hourglass-shaped, the longitudinal section of the inner part of the sleeve 3 is rectangular, the outer side wall of the sleeve 3 is rotatably connected with two coaxial annular bodies 96, the outer side surfaces of the two annular bodies 96 are respectively and fixedly connected with two transverse first connecting rods 8, the far ends of the, be equipped with hydraulic telescoping rod 12 between the supporting shoe 11, hydraulic telescoping rod 12's both ends are connected with two supporting shoe 11 bottom surface hinges respectively, two second connecting rods 10 are all equipped with the second pivot 13 of front and back orientation at a distance from far one end, second pivot 13 middle part all overlaps and is equipped with second axle sleeve 14, second axle sleeve 14 respectively with the corresponding one end fixed connection of second connecting rod 10, the equal fixed mounting in second pivot 13 both ends has

power wheel

15, 1 side front and back of first pivot rotates and is connected with third axle sleeve 16, third axle sleeve 16 top is connected with through bracing piece 17 spouts medicine mechanism, spout the last fixed mounting of medicine mechanism and have the power, controller 24 and signal receiver, power and controller 24 with spout medicine mechanism, level sensor 25, hydraulic telescoping rod 12, power wheel 15, signal receiver links to each other, it uses with signal receiver cooperation to be equipped with the remote controller in addition. When the invention runs on ordinary flat ground, as shown in fig. 4, at this time, the controller 24 controls the four power wheels 15 to rotate and advance, the hydraulic telescopic rod 12 controls the two first connecting rods 8 to keep a certain included angle, so that the sleeve 3 can not swing back and forth in the running process, after entering the walnut forest land, the device runs between two rows of walnut trees, the controller 24 controls the hydraulic telescopic rod 12 to extend until the two first connecting rods 8 are positioned on the same horizontal line, as shown in figure 2, the two regular triangular plates 2 are always relatively twisted at an angle of sixty degrees, the two regular triangular plates 2 are always in contact with the ground at partial corners, and at the moment, because the heights of the centers of gravity of the two regular triangular plates 2 from the ground are different and constantly change, the two ends of the first rotating shaft 1 connected with the regular triangular plates 2 deflect in multiple directions, and the motion trail of the first rotating shaft 1 approximately forms a transverse hourglass shape; when the front end and the rear end of the first rotating shaft 1 perform reciprocating swing in the vertical direction around the ball body 6, the first connecting rod 8 simultaneously performs reciprocating swing in the front-rear direction around the axis of the first connecting rod 8 along with the sleeve 3; when the front end and the rear end of the first rotating shaft 1 perform reciprocating swing around the ball body 6 in the left-right direction, the first rotating shaft 1 can move along the widened groove 4 arranged in a matching way, so that the front end and the rear end of the first rotating shaft 1 perform reciprocating swing around the ball body 6 in the left-right direction in the sleeve 3, the spherical groove 5 is matched with the ball body 6, the first rotating shaft 1 can not only ensure that the front end and the rear end of the first rotating shaft 1 do not move in the front-back direction, but also facilitate the reciprocating swing motion of the two ends of the first rotating shaft 1 around the ball body 6, because the pesticide spraying mechanism is connected with the first rotating shaft 1 through the third shaft sleeve 16 and the support rod 17, the pesticide spraying mechanism is driven to synchronously swing in the swing process of the first rotating shaft 1, the pesticide spraying mechanism simultaneously performs left-right swing, when the pesticide spraying mechanism swings, the pesticide liquid in the pesticide spraying mechanism is mixed, the spraying angle is increased, the spraying area is enlarged, the vertex angle, the walnut forest spraying device has the advantage of being not easy to slip, when spraying is finished and a walnut forest is going to run out, a user sends a signal to the signal receiver by using the remote controller and transmits the signal to the controller 24, at the moment, after the controller 24 receives a horizontal state signal of the horizontal sensor 25 in any state, the first rotating power device is controlled to stop working, the hydraulic telescopic rod 12 is controlled to be shortened, the regular triangle plate 2 is lifted and separated from the ground, meanwhile, the sleeve 3 is locked by the two inclined first connecting rods 8 and the ring body 96, so that the sleeve cannot swing, but the spraying mechanism can still swing left and right along with the two ends of the first rotating shaft 1 in the advancing process, and medicine mixing is facilitated; the walnut forest land spraying device is ingenious in structure and reasonable in design, loose and wet walnut forest land pavements can be overcome, the spraying height and the spraying area of the spraying mechanism to the medicine can be increased through the swinging and the movement of the regular triangular plate 2 and the first rotating shaft 1, the dynamic spraying is carried out in a large range, the working efficiency is improved, and the manpower resources are saved.

Particularly, as shown in the figure, this embodiment spout medicine mechanism include the backup pad 20 that bottom and bracing piece 17 are connected, backup pad 20 bottom links to each other with primary shaft cover 9 through bearing structure, backup pad 20 top surface fixed mounting has upper portion open-ended fixed case 21, install flourishing explosive barrel 22 in the fixed case 21, keep apart for several flourishing medicine district in the flourishing explosive barrel 22, spray the position splendid attire according to the difference in the flourishing medicine district and have different medicines, all be equipped with the liquid pump in every flourishing medicine district, two shower nozzles 23 towards fore-and-aft direction are installed respectively to flourishing explosive barrel 22 top, shower nozzle 23 passes through the pipe intercommunication with the liquid pump in every flourishing medicine district respectively, flourishing explosive barrel 22 top fixed mounting has the power, controller 24 and signal receiver, the power, controller 24 links to each other with the liquid pump. When the first rotating shaft 1 swings, the horizontal sensor 25 continuously transmits horizontal position information to the controller 24, when the front end of the first rotating shaft 1 is higher than the rear end, on one hand, the controller 24 controls a liquid pump connected with the front spray head 23 to work, the liquid pump corresponds to a medicine containing area where walnut trees spray medicine at a high position, on the other hand, the controller 24 controls a liquid pump connected with the rear spray head 23 to work, the liquid pump corresponds to a medicine containing area where walnut trees spray medicine at a low position, when the heights of the front end and the rear end of the first rotating shaft 1 are equal, the controller controls the liquid pump in the medicine containing area where the front spray head 23 and the rear spray head 23 are connected to spray medicine at a middle position, and after the liquid pump works, the spray heads 23 spray corresponding medicine corresponding to walnut trees with different heights, so that the advantages of medicine feeding according to the symptoms and medicine spraying efficiency are improved.

Specifically, as shown in the drawings, the vertex of the corner of the regular triangle plate 2 described in this embodiment is rounded, and the side surfaces of all the sides of the regular triangle plate 2 are rounded. The fillet on the regular triangle shaped plate 2 can reduce the required moment of torsion of regular triangle shaped plate 2 rotation, prevents that 1 atress of first pivot is too big, and the cambered surface of regular triangle shaped plate 2 enables first pivot 1 and sways the in-process in deflecting, has enough big regular triangle shaped plate 2's area and ground contact all the time, can slow down the wearing and tearing of regular triangle shaped plate 2, increases the friction on regular triangle shaped plate 2 and ground.

Further, as shown in the figure, the nozzle 23 according to the embodiment is an atomizing nozzle. The atomizer can spray liquid medicine atomizing, and coverage is wider, and the effect is better.

Furthermore, as shown in the drawings, the supporting structure of the present embodiment includes a ball axle 18 with two ends provided with ball heads, and the two ends of the ball axle 18 are connected with the top surface of the first sleeve 9 and the bottom surface of the supporting plate 20 respectively. During the rotation and swing motion of the first rotating shaft 1, the ball axle 18 plays a role of supporting and stabilizing the support plate 20, and the ball heads at the two ends of the ball axle 18 are connected so that the first shaft sleeve 9 is not influenced by the rotation motion of the support plate 20.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a self-propelled spraying laxative machine of walnut forest which characterized in that: the novel rotary table comprises a first rotary shaft (1) facing forwards and backwards, wherein the front end and the rear end of the first rotary shaft (1) are respectively provided with a regular triangle plate (2), the gravity center position of one side, opposite to the two regular triangle plates (2), is respectively fixedly connected with the front end and the rear end of the first rotary shaft (1), the two regular triangle plates (2) are symmetrical relative to the geometric center of the first rotary shaft (1), the middle part of the first rotary shaft (1) is sleeved with a sleeve (3), the middle part of the inner side surface of the sleeve (3) is provided with a ring groove (5) coaxial with the sleeve (3), a ring block (99) is rotatably arranged in the ring groove (5) through a bearing, the inner side surface of the ring block (99) is a spherical surface, the inner side surface of the ring block (99) is provided with a sliding groove (98) along the front and rear direction of the spherical surface, a sliding block (97) is arranged in, the middle part of the sphere (6) is provided with a front-back oriented through hole (7), the middle part of the side surface of the first rotating shaft (1) is fixedly connected with the inner side surface of the through hole (7), the outer side surface of the annular block (99) is provided with a ring of teeth (90), the middle part of the side surface of the annular groove (5) is provided with a through hole (95), a motor (94) is fixedly arranged in the through hole (95), an output shaft of the motor (94) is fixedly sleeved with a gear (89), the gear (89) is meshed with the teeth (90) on the outer side surface of the annular block (99), the top of the sleeve (3) is fixedly provided with a level sensor (25), the front and back left and right sides of the inner wall of the sleeve (3) are provided with widened grooves (4), the cross section of the inner part of the sleeve (3) is hourglass-shaped, the longitudinal section of the inner part of the sleeve (3) is rectangular, the outer side wall, the far ends of the two first connecting rods (8) are respectively and rotatably connected with two transverse second connecting rods (10) through first shaft sleeves (9), supporting blocks (11) are respectively and fixedly installed at the lower parts of the side surfaces of the first shaft sleeves (9), hydraulic telescopic rods (12) are arranged between the supporting blocks (11), the two ends of each hydraulic telescopic rod (12) are respectively and hingedly connected with the bottom surfaces of the two supporting blocks (11), front and back second rotating shafts (13) are respectively arranged at the far ends of the two second connecting rods (10), second shaft sleeves (14) are respectively and fixedly connected with the corresponding ends of the second connecting rods (10), power wheels (15) are respectively and fixedly installed at the two ends of the second rotating shafts (13), the front and back parts of the side surfaces of the first rotating shafts (1) are rotatably connected with third shaft sleeves (16), and the tops of the third shaft sleeves (16) are connected with a pesticide spraying mechanism through supporting rods (17), the pesticide spraying mechanism is fixedly provided with a power supply, a controller (24) and a signal receiver, the power supply and the controller (24) are connected with the pesticide spraying mechanism, the level sensor (25), the hydraulic telescopic rod (12), the power wheel (15) and the signal receiver, and a remote controller is arranged to be matched with the signal receiver for use.

2. The self-propelled sprayer of walnut forest of claim 1, characterized in that: spout medicine mechanism backup pad (20) of being connected including bottom and bracing piece (17), backup pad (20) bottom links to each other with first axle sleeve (9) through bearing structure, backup pad (20) top surface fixed mounting has upper portion open-ended fixed case (21), install flourishing explosive barrel (22) in fixed case (21), keep apart for the flourishing medicine district of several in flourishing explosive barrel (22), spray the position splendid attire according to the difference in the flourishing medicine district and have different medicines, all be equipped with the liquid pump in every flourishing medicine district, two shower nozzles (23) towards the fore-and-aft direction respectively are installed at flourishing explosive barrel (22) top, shower nozzle (23) pass through the pipe intercommunication with the liquid pump in every flourishing medicine district respectively, flourishing explosive barrel (22) top fixed mounting has the power, controller (24) and signal receiver, a power, controller (24) link to each other with the liquid pump.

3. The self-propelled sprayer of walnut forest of claim 1, characterized in that: the top of the angle of the regular triangle plate (2) is chamfered with a round angle, and the side surfaces of all the edges of the regular triangle plate (2) are chamfered with cambered surfaces.

4. The self-propelled sprayer of walnut forest of claim 1, characterized in that: the spray head (23) is an atomizing spray head.

5. The self-propelled sprayer of walnut forest of claim 2, characterized in that: the supporting structure comprises a ball shaft (18) with ball heads at two ends, and the two ends of the ball shaft (18) are respectively connected with the ball heads on the top surface of the first shaft sleeve (9) and the bottom surface of the supporting plate (20).