CN216271373U

CN216271373U - Novel express delivery cabinet based on unmanned aerial vehicle technique

Info

Publication number: CN216271373U
Application number: CN202122712693.5U
Authority: CN
Inventors: 刘益军; 徐超
Original assignee: Suzhou Changdingxing Intelligent Science & Technology Co ltd
Current assignee: Suzhou Changdingxing Intelligent Science & Technology Co ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-04-12
Anticipated expiration: 2031-11-08

Abstract

The utility model relates to the technical field of express delivery cabinets, in particular to a novel express delivery cabinet based on unmanned aerial vehicle technology, which comprises a cabinet body, wherein cabinet doors are uniformly distributed on the outer surface of the cabinet body, a stand column receiving mechanism is installed inside the cabinet body, first goods shelf conveyors for conveying goods are uniformly distributed on two sides of the stand column receiving mechanism, the first goods shelf conveyors correspond to the cabinet doors, a second goods shelf conveyor for receiving the goods is movably installed on the surface of the stand column receiving mechanism, a protective cover is movably installed at the top of the cabinet body, an opening and closing mechanism is arranged inside the protective cover and used for driving the protective cover, and an unmanned aerial vehicle platform and a centering mechanism are arranged at the top of the cabinet body. The utility model is convenient for the butt joint of the unmanned aerial vehicle to automatically receive goods, and has strong safety and high efficiency.

Description

Novel express delivery cabinet based on unmanned aerial vehicle technique

Technical Field

The utility model relates to the technical field of express cabinets, in particular to a novel express cabinet based on an unmanned aerial vehicle technology.

Background

Present express delivery cabinet all is the artifical goods of delivering, and is inefficient, when meetting the traffic jam condition, during the express delivery cabinet is delivered to the unable quick of goods, delivers the express delivery through unmanned aerial vehicle and can solve this problem, and the goods are deposited to the unable convenient unmanned aerial vehicle of butt joint of present express delivery cabinet nevertheless.

Therefore, a need exists to design a novel express cabinet based on unmanned aerial vehicle technology to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a novel express cabinet based on an unmanned aerial vehicle technology, and aims to solve the problem that goods cannot be conveniently stored by butting an unmanned aerial vehicle in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a novel express delivery cabinet based on unmanned aerial vehicle technique, includes the cabinet body, the surface evenly distributed of the cabinet body has the cabinet door, the internally mounted of the cabinet body has the stand to connect thing mechanism, the stand connects the both sides evenly distributed of thing mechanism to have the first goods shelves conveyer that is used for carrying the goods, just first goods shelves conveyer is corresponding with the cabinet door, the stand connects the surface movable mounting of thing mechanism to have the second goods shelves conveyer that is used for receiving the goods, the top movable mounting of the cabinet body has the protection casing, just the inside of protection casing is provided with the mechanism that opens and shuts and is used for driving the protection casing, the top of the cabinet body is provided with unmanned aerial vehicle platform and centering mechanism.

Preferably, the second goods shelves conveyer includes curb plate and conveyer belt, the curb plate distributes in the both sides of conveyer belt, just the inside both ends of conveyer belt all are provided with the backing roll, and the backing roll rotates with the curb plate through the pivot to be connected, the bottom of curb plate is fixed with first motor, the output of first motor passes through first belt and first belt pulley cooperation and backing roll interlock, the structure of first goods shelves conveyer is the same with the structure of second goods shelves conveyer.

Preferably, stand connects thing mechanism includes vertical frame, vertical frame is fixed in the bottom of the cabinet body, the upper surface swing joint of vertical frame has vertical platform, the bottom of vertical platform is fixed with first slider, the upper surface of vertical frame is fixed with first linear slide rail, first slider and first linear slide rail sliding connection, the upper surface of vertical frame is provided with vertical actuating mechanism, and vertical actuating mechanism comprises second motor, supporting wheel, second belt pulley and second belt, second motor and supporting wheel distribution and the surperficial both ends of vertical frame, the output of second motor is fixed with the second belt pulley, and the surface cover of second belt pulley is equipped with the second belt, and the both ends cover of second belt is established on the supporting wheel, just the bottom and the second belt fixed connection of vertical platform.

Preferably, the upper surface of vertical platform is provided with vertical drive mechanism, and vertical drive mechanism includes that stand, third motor, vertical platform, third belt pulley and third belt constitute, the bottom of stand and third motor is all fixed on vertical platform, the output of third motor is fixed with the third belt pulley, and the quantity of third belt pulley is two, and another third belt pulley rotates through the top of pivot and stand to be connected, and the both ends of third belt overlap respectively on two third belt pulleys, the side of vertical platform is fixed with the second slider, the external fixed surface of stand has second linear slide rail, second slider and second linear slide rail sliding connection, and third belt and vertical platform fixed connection, the curb plate is fixed on vertical platform.

Preferably, the unmanned aerial vehicle platform includes two fixed columns, two the fixed column is fixed respectively in the top both sides of the cabinet body, two the bottom of fixed column all rotates through the pivot and is connected with electric push rod, electric push rod's output rotates through the pivot and is connected with the backup pad, the shipment mouth has been seted up on the top of the cabinet body, the backup pad comprises two, two the backup pad is relative setting, just the both sides of backup pad are all rotated through the pivot and are connected with the inner wall of shipment mouth.

Preferably, the mechanism that opens and shuts comprises fourth motor, gear and rack, the protection casing comprises two, two the protection casing is relative setting, the bottom of protection casing and the top sliding connection of the cabinet body, the rack is fixed on the inner chamber wall of protection casing, the fourth motor is fixed on the cabinet body, the output of fourth motor is fixed with the gear, just wheel and rack toothing.

Preferably, centering mechanism comprises four layer boards, two fourth motors and four centering rods, four the top four corners at the cabinet body, two are fixed to the layer board the fourth motor is installed respectively on two layer boards of corner, the output of fourth motor is fixed with the driving gear, and the linkage has the driving medium on the driving gear, and the driving medium comprises three drive gear and three drive cingulums end to end, two the output of fourth motor all is furnished with a driving medium, and two driving mediums are back font and distribute, four the centering rod is the groined type and arranges, the both ends of centering rod all with cabinet body sliding connection, two that are relative centering rod installs on same driving medium, and one the centering rod is installed in the inboard of drive cingulum, and one is installed in the outside of drive cingulum.

Compared with the prior art, the utility model has the beneficial effects that: this novel express delivery cabinet based on unmanned aerial vehicle technique is convenient for dock unmanned aerial vehicle and is received the goods automatically, and the security is strong, and is efficient.

(1) The vertical column receiving mechanism is arranged in the cabinet body to drive the second goods shelf conveyor to move, the first goods shelf conveyors corresponding to the cabinet doors are arranged on two sides of the second goods shelf conveyor to convey goods, and after the unmanned aerial vehicle puts the goods on the unmanned aerial vehicle platform, the opening and closing mechanism drives the protective cover to be closed, so that the goods are protected, and the safety of the goods is guaranteed;

(2) open from the shipment mouth through electric push rod drive backup pad, the goods can fall on the second goods shelves conveyer, the rethread stand connects thing mechanism drive second goods shelves conveyer to deliver to the goods first goods shelves conveyer department that corresponds, rethread second goods shelves conveyer removes the goods to first goods shelves conveyer on, can accomplish the goods butt joint with unmanned aerial vehicle, cooperate unmanned aerial vehicle, the problem of traffic jam has been solved, the efficiency is delivered to the goods is greatly improved, delivery to urgent article has improved efficiency greatly.

Drawings

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

FIG. 2 is a schematic cross-sectional elevation view of the structure of the present invention;

FIG. 3 is a schematic side cross-sectional view of the structure of the present invention;

FIG. 4 is a schematic overall view of the second rack conveyor and the upright receiving mechanism of FIG. 1 in accordance with the present invention;

FIG. 5 is a schematic view of the entire structure of the UAV platform of FIG. 1 according to the present invention;

FIG. 6 is an enlarged view of the structure at A in FIG. 1 according to the present invention;

FIG. 7 is a schematic view of the centering mechanism of FIG. 5 according to the present invention.

In the figure: 1. a cabinet body; 2. a first rack conveyor; 3. a second rack conveyor; 31. a side plate; 32. a conveyor belt; 33. a first motor; 4. an upright post receiving mechanism; 41. a longitudinal frame; 42. a second motor; 43. a longitudinal platform; 44. a column; 45. a third motor; 46. a vertical platform; 5. an unmanned aerial vehicle platform; 51. fixing a column; 52. an electric push rod; 53. a support plate; 6. a protective cover; 7. an opening and closing mechanism; 71. a fourth motor; 72. a gear; 73. a rack; 8. a centering mechanism; 81. a support plate; 82. a fourth motor; 83. a centering rod.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Referring to fig. 1-7, an embodiment of the present invention is shown:

a novel express cabinet based on unmanned aerial vehicle technology comprises a cabinet body 1, cabinet doors are uniformly distributed on the outer surface of the cabinet body 1, a stand column object receiving mechanism 4 is installed inside the cabinet body 1, the stand column object receiving mechanism 4 comprises a longitudinal frame 41, the longitudinal frame 41 is fixed at the bottom of the cabinet body 1, a longitudinal platform 43 is movably connected to the upper surface of the longitudinal frame 41, the longitudinal platform 43 can longitudinally move on the longitudinal frame 41, a first sliding block is fixed at the bottom of the longitudinal platform 43, a first linear sliding rail is fixed on the upper surface of the longitudinal frame 41, and the first sliding block is in sliding connection with the first linear sliding rail to guarantee the sliding stability of the longitudinal platform 43 on the longitudinal frame 41;

the upper surface of vertical frame 41 is provided with vertical actuating mechanism, vertical actuating mechanism is by second motor 42, the supporting wheel, second belt pulley and second belt are constituteed, second motor 42 and supporting wheel distribution and the surperficial both ends of vertical frame 41, the both sides of supporting wheel are connected with vertical frame 41 rotation through the pivot, the output of second motor 42 is fixed with the second belt pulley, the surface cover of second belt is equipped with the second belt, the both ends cover of second belt is established on the supporting wheel, and the bottom and the second belt fixed connection of vertical platform 43, it is rotatory to drive the second belt pulley through second motor 42, the second belt pulley drives the belt and rolls, can drive vertical platform 43 back-and-forth movement on vertical frame 41.

Further, as shown in fig. 1 and 4, a vertical driving mechanism is disposed on the upper surface of the vertical platform 43, the vertical driving mechanism includes an upright column 44, a third motor 45, a vertical platform 46, a third belt pulley and a third belt, the bottom ends of the upright column 44 and the third motor 45 are fixed on the vertical platform 43, the output end of the third motor 45 is fixed with the third belt pulley, the number of the third belt pulley is two, the third belt pulley can support two ends of the third belt, another third belt pulley is rotatably connected with the top end of the upright column 44 through a rotating shaft, two ends of the third belt are respectively sleeved on the two third belt pulleys, a second slider is fixed on the side surface of the vertical platform 46, a second linear sliding rail is fixed on the outer surface of the upright column 44, the second slider is slidably connected with the second linear sliding rail, the third belt is fixedly connected with the vertical platform 46, the side plate 31 is fixed on the vertical platform 46, the third belt pulley is driven to rotate by the third motor 45, so that the third belt can be driven to roll, the vertical platform 46 is enabled to move vertically, and the second shelf conveyor 3 is driven to move vertically.

The stand connects the both sides evenly distributed of thing mechanism 4 to have a goods conveyor 2 that is used for carrying the goods, and first goods conveyor 2 is corresponding with the cabinet door, opens the cabinet door, can take the goods of placing on the first goods conveyor 2.

The surface of the upright post receiving mechanism 4 is movably provided with a second shelf conveyor 3 for receiving goods, the second shelf conveyor 3 comprises a side plate 31 and a conveying belt 32, the side plate 31 is distributed at two sides of the conveying belt 32, and two ends inside the conveying belt 32 are both provided with supporting rollers for supporting the conveying belt 32, the supporting rollers can drive the conveying belt 32 to roll when rotating, the supporting rollers are rotatably connected with the side plate 31 through rotating shafts, the bottom of the side plate 31 is fixed with a first motor 33, the output end of the first motor 33 is matched with the supporting rollers through a first belt and a first belt pulley, the structure of the first shelf conveyor 2 is the same as that of the second shelf conveyor 3, the first belt pulley is driven to rotate through the first motor 33, so that the first belt drives the supporting rollers to rotate, thereby driving the conveying belt 32 to roll and convey goods, the working principle of the first shelf conveyor 2 is the same as that of the second shelf conveyor 3, the difference is that the first shelf conveyor 2 is mounted in the cabinet 1 and is not movable by itself.

As shown in fig. 1 and 6, a protective cover 6 is movably mounted at the top of the cabinet 1, an opening and closing mechanism 7 is disposed inside the protective cover 6 and used for driving the protective cover 6, the opening and closing mechanism 7 is composed of a fourth motor 71, a gear 72 and a rack 73, the protective cover 6 is composed of two protective covers 6, the two protective covers 6 are oppositely disposed, the bottom of the protective cover 6 is slidably connected with the top end of the cabinet 1, the rack 73 is fixed on the inner cavity wall of the protective cover 6, the fourth motor 71 is fixed on the cabinet 1, the output end of the fourth motor 71 is fixed with the gear 72, the gear 72 is engaged with the rack 73, the gear 72 is driven to rotate by the fourth motor 71, so that the rack 73 is shifted by the gear 72, the rack 73 can drive the protective cover 6 to move on the cabinet 1, the moving directions of the two protective covers 6 are opposite, and thus the two protective covers 6 can be opened to both sides.

As shown in fig. 1 and fig. 5, the top of the cabinet body 1 is provided with unmanned aerial vehicle platform 5, unmanned aerial vehicle platform 5 includes two fixed columns 51, two fixed columns 51 are fixed respectively in the top both sides of the cabinet body 1, the bottom of two fixed columns 51 is all rotated through the pivot and is connected with electric push rod 52, electric push rod 52 rotates through the pivot and is connected with backup pad 53, electric push rod 52 is when flexible like this, can push and pull backup pad 53, the shipment mouth has been seted up on the top of the cabinet body 1, backup pad 53 comprises two, two backup pads 53 are relative setting, and backup pad 53's both sides are all rotated through the pivot and the inner wall of shipment mouth and are connected, electric push rod 52 pushes and pulls backup pad 53 during, backup pad 53 uses the axle that links to each other with the shipment mouth to overturn as the centre of a circle, two backup pads 53 are rotatory with opposite direction simultaneously, can open and shut in shipment mouth department.

Further, as shown in fig. 1, 5 and 7, a centering mechanism 8 is disposed at the top of the cabinet body 1, the centering mechanism 8 is composed of four supporting plates 81, two fourth motors 82 and four centering rods 83, the four supporting plates 81 are fixed at four corners of the top end of the cabinet body 1, the two fourth motors 82 are respectively mounted on the two supporting plates 81 at the corners for mounting other parts, the output end of the fourth motor 82 is fixed with a driving gear, the driving gear is linked with a transmission member, the transmission member is composed of three transmission gears and three transmission toothed belts connected end to end, the output ends of the two fourth motors 82 are respectively provided with a transmission member, the two transmission members are distributed in a shape of Chinese character 'hui', the four centering rods 83 are arranged in a shape of Chinese character 'jing', two ends of the centering rods 83 are slidably connected with the cabinet body 1, the two opposing centering rods 83 are mounted on the same transmission member, and one centering rod 83 is mounted on the inner side of the transmission toothed belt, one is installed on the outer side of the transmission toothed belt, the first fourth motor 82 drives the driving gear to rotate anticlockwise to drive the transmission toothed belt to roll, so that the first centering rod 83 installed on the transmission toothed belt slides towards the center of the supporting plate 53, meanwhile, the transmission toothed belt adjacent to the transmission toothed belt is driven to synchronously roll anticlockwise, the second centering rod 83 opposite to the first centering rod 83 synchronously moves towards the center of the supporting plate 53, and similarly, the second fourth motor 82 can drive the other two centering rods 83 to synchronously move towards the center of the supporting plate 53, and objects on the supporting plate 53 can be centered by simultaneously moving towards the center of the supporting plate 53 through the four centering rods 83.

The working principle is as follows: when this novel express delivery cabinet based on unmanned aerial vehicle technique was held as receiving, made this novel express delivery cabinet based on unmanned aerial vehicle technique be in the on state through external power supply, the express delivery to receiving goods end delivery goods, when unmanned aerial vehicle reachd protection casing 6 top, it is rotatory through fourth motor 71 drive gear 72, gear 72 stirs rack 73 and slides to the side, makes two protection casings 6 open to both sides and exposes unmanned aerial vehicle platform 5.

Then the unmanned aerial vehicle puts the goods on the unmanned aerial vehicle platform 5, the opening and closing mechanism 7 drives the protective cover 6 to close in a reverse direction to protect the goods, then the electric push rod 52 contracts to pull the supporting plate 53 to turn downwards and open, as shown in fig. 2, the goods fall on the second shelf conveyor 3, then the centering mechanism 8 centers the goods, the first and fourth motors 82 drive the driving gear to rotate anticlockwise to drive the driving toothed belt to roll, so that the first centering rod 83 arranged on the driving toothed belt slides towards the center of the supporting plate 53, meanwhile, the driving toothed belt adjacent to the centering toothed belt is driven to synchronously roll anticlockwise, so that the second centering rod 83 opposite to the first centering rod 83 synchronously moves towards the center of the supporting plate 53, similarly, the second motor 82 can drive the other two centering rods 83 to synchronously move towards the center of the supporting plate 53, and simultaneously move towards the center of the supporting plate 53 through the four centering rods 83, the items on the support plate 53 can be centered.

Then, the third belt pulley is driven to rotate by the third motor 45 to drive the third belt to roll, so that the vertical platform 46 is lifted up and down to be butted with the first shelf conveyors 2 with different heights, the second belt pulley is driven to drive the second belt to roll by the second motor 42, the longitudinal platform 43 can be moved longitudinally, and the second shelf conveyor 3 is adjusted to be butted with the first shelf conveyors 2 at different positions in the front and back.

After the position of the second shelf conveyor 3 is adjusted, the first belt pulley is driven by the first motor 33 to drive the supporting roller to roll, so that the conveying belt 32 rolls to convey goods to the first shelf conveyor 2, and a consignee can open the corresponding cabinet door on the cabinet body 1 to take the goods.

When this novel express delivery cabinet based on unmanned aerial vehicle technique was as the delivery end, operation flow is opposite, can accomplish unmanned butt joint unmanned aerial vehicle and carry out the delivery.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a novel express delivery cabinet based on unmanned aerial vehicle technique, includes the cabinet body (1), the surface evenly distributed of the cabinet body (1) has cabinet door, its characterized in that: the utility model discloses a cabinet, including the cabinet body, the internally mounted of the cabinet body (1) has the stand to connect thing mechanism (4), the stand connects the both sides evenly distributed of thing mechanism (4) to have first goods shelves conveyer (2) that are used for carrying the goods, just first goods shelves conveyer (2) are corresponding with the cabinet door, the stand connects the surface movable mounting of thing mechanism (4) to have second goods shelves conveyer (3) that are used for receiving the goods, the top movable mounting of the cabinet body (1) has protection casing (6), just the inside of protection casing (6) is provided with opens and shuts mechanism (7) and is used for driving protection casing (6), the top of the cabinet body (1) is provided with unmanned aerial vehicle platform (5) and centering mechanism (8).

2. The novel express delivery cabinet based on unmanned aerial vehicle technique of claim 1, characterized in that: second shelf conveyor (3) include curb plate (31) and conveyer belt (32), curb plate (31) distribute in the both sides of conveyer belt (32), just the inside both ends of conveyer belt (32) all are provided with the backing roll, and the backing roll rotates through pivot and curb plate (31) to be connected, the bottom of curb plate (31) is fixed with first motor (33), the output of first motor (33) is through first belt and first belt pulley cooperation and backing roll interlock, the structure of first shelf conveyor (2) is the same with the structure of second shelf conveyor (3).

3. The novel express delivery cabinet based on unmanned aerial vehicle technique of claim 2, characterized in that: the upright post receiving mechanism (4) comprises a longitudinal frame (41), the longitudinal frame (41) is fixed at the bottom of the cabinet body (1), the upper surface of the longitudinal frame (41) is movably connected with a longitudinal platform (43), the bottom of the longitudinal platform (43) is fixed with a first slider, the upper surface of the longitudinal frame (41) is fixed with a first linear slide rail, the first slider is connected with the first linear slide rail in a sliding manner, the upper surface of the longitudinal frame (41) is provided with a longitudinal driving mechanism, the longitudinal driving mechanism consists of a second motor (42), a supporting wheel, a second belt wheel and a second belt, the second motor (42) and the supporting wheel are distributed at two ends of the surface of the longitudinal frame (41), the output end of the second motor (42) is fixed with the second belt wheel, the outer surface of the second belt wheel is sleeved with the second belt, and two ends of the second belt are sleeved on the supporting wheel, and the bottom of the longitudinal platform (43) is fixedly connected with the second belt.

4. The novel express delivery cabinet based on unmanned aerial vehicle technique of claim 3, characterized in that: the upper surface of the longitudinal platform (43) is provided with a vertical driving mechanism, the vertical driving mechanism comprises an upright post (44), a third motor (45), a vertical platform (46), a third belt pulley and a third belt, the bottom ends of the upright post (44) and the third motor (45) are fixed on the longitudinal platform (43), the output end of the third motor (45) is fixed with two third belt pulleys, the other third belt pulley is rotatably connected with the top end of the upright post (44) through a rotating shaft, two ends of a third belt are respectively sleeved on the two third belt pulleys, a second sliding block is fixed on the side surface of the vertical platform (46), a second linear slide rail is fixed on the outer surface of the upright post (44), the second sliding block is connected with the second linear slide rail in a sliding way, and the third belt is fixedly connected with the vertical platform (46), and the side plate (31) is fixed on the vertical platform (46).

5. The novel express delivery cabinet based on unmanned aerial vehicle technique of claim 1, characterized in that: unmanned aerial vehicle platform (5) include two fixed columns (51), two fixed column (51) are fixed respectively in the top both sides of the cabinet body (1), two the bottom of fixed column (51) all rotates through the pivot and is connected with electric push rod (52), the output of electric push rod (52) rotates through the pivot and is connected with backup pad (53), the shipment mouth has been seted up on the top of the cabinet body (1), backup pad (53) comprises two backup pad (53), two backup pad (53) are relative setting, just the both sides of backup pad (53) all rotate through the pivot and the inner wall of shipment mouth is connected.

6. The novel express delivery cabinet based on unmanned aerial vehicle technique of claim 1, characterized in that: mechanism (7) of opening and shutting comprises fourth motor (71), gear (72) and rack (73), protection casing (6) comprise two, two protection casing (6) are relative setting, the bottom of protection casing (6) and the top sliding connection of the cabinet body (1), rack (73) are fixed on the inner chamber wall of protection casing (6), fourth motor (71) are fixed on the cabinet body (1), the output of fourth motor (71) is fixed with gear (72), just gear (72) and rack (73) meshing.

7. The novel express delivery cabinet based on unmanned aerial vehicle technique of claim 1, characterized in that: the centering mechanism (8) comprises four supporting plates (81), two fourth motors (82) and four centering rods (83), the four supporting plates (81) are fixed at the four corners of the top end of the cabinet body (1), the two fourth motors (82) are respectively installed on the two supporting plates (81) at the corners, the output ends of the fourth motors (82) are fixedly provided with driving gears, the driving gears are linked with transmission pieces, the transmission pieces comprise three transmission gears and three transmission toothed belts which are connected end to end, the output ends of the two fourth motors (82) are respectively provided with one transmission piece, the two transmission pieces are distributed in a shape like a Chinese character 'hui', the four centering rods (83) are distributed in a shape like a Chinese character 'jing', the two ends of each centering rod (83) are connected with the cabinet body (1) in a sliding manner, the two opposite centering rods (83) are installed on the same transmission piece, and one centering rod (83) is installed on the inner side of the transmission toothed belts, one is arranged at the outer side of the transmission toothed belt.