CN112319268A

CN112319268A - Charging device suitable for new energy automobile

Info

Publication number: CN112319268A
Application number: CN202011075570.9A
Authority: CN
Inventors: 佟玉振; 王红莲
Original assignee: Individual
Current assignee: Pan'an Zongheng Information Technology Co Ltd
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2021-02-05
Anticipated expiration: 2039-05-17
Also published as: CN110065409A; CN110065409B; CN112319268B

Abstract

The invention provides a charging device suitable for a new energy automobile, which comprises a charging pile provided with an installation bin, wherein the front end of the installation bin is provided with a slideway, two symmetrically distributed conducting devices are installed in the slideway, a charging plate is arranged below each conducting device, the charging plate is connected with a main power supply arranged below the charging plate through a first electric wire, and an electromagnetic conversion device is also arranged between the two conducting devices; the receiving head device provided by the invention is matched with the locking device, so that the receiving head can be prevented from being loosened, and the safety performance during charging is higher.

Description

Charging device suitable for new energy automobile

Technical Field

The invention is a divisional application with a case application number of 2019104166615. The invention belongs to the technical field of automobile accessories and new energy automobiles, and particularly relates to a charging device suitable for a new energy automobile.

Background

At present, new energy automobiles are widely used due to excellent performances of energy conservation, environmental protection and the like, the new energy automobiles are driven by electric power, a charging device is one of indispensable devices, and the safety of the charging device needs to be further improved.

For example, chinese patent document discloses a new energy automobile apparatus, and the application number: 201710855458.9, the new energy automobile equipment comprises a charging part fixedly installed at the upper right part of a charging pile body and a charging gun connected with a new energy automobile, wherein a bottom plate is fixedly installed on the bottom end face of the charging pile body, electric connecting pins are installed on the left end face of the charging gun in a vertically symmetrical mode, and a first lug is fixedly arranged on the left end of the outer end face of each electric connecting pin; the mutual symmetry is provided with the groove of sliding from top to bottom in the portion of charging, can install the sliding block with sliding from top to bottom in the groove of sliding, and the screw form pole is installed to the cooperation in the sliding block, and the screw form pole is connected with the machine of ordering about of fixed mounting in the portion of charging, be provided with in the sliding block about link up and with first lug complex chamber of sliding, slide in the chamber of sliding and install the sliding rod, the terminal surface fixed mounting that the sliding block far-away ordered about the machine has the sand grip.

Although the safety performance is increased to a certain extent, the new energy automobile equipment in the scheme is complex in structure, not beneficial to maintenance and not beneficial to use in rainy days.

Disclosure of Invention

The invention aims to solve the problems and provides a charging device suitable for a new energy automobile.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a charging device suitable for new energy automobile, is including being equipped with the electric pile that fills in installation storehouse, its characterized in that: the front end of the installation bin is provided with a slideway, two symmetrically distributed conducting devices are installed in the slideway, a charging plate is arranged below each conducting device, the charging plate is connected with a main power supply arranged below the charging plate through a first electric wire, and an electromagnetic conversion device is also arranged between the two conducting devices; the novel energy automobile power supply device is characterized in that two running grooves which are symmetrically distributed are further formed in one side of the mounting bin, the running grooves are formed in one side of the conducting device, first gear teeth are arranged below the running grooves, a receiving head device is mounted at the upper end of the first gear teeth, the front end of the receiving head device is connected with a storage battery of a new energy automobile through a second electric wire, and a locking device is arranged above the receiving head device.

Preferably, the conductive device comprises a spring fixedly installed in the installation bin, the spring is horizontally installed, a conductive block matched with the slide way is fixedly installed at the front end of the spring, the spring is formed by bending metal with good expansion and contraction performance, the front end of the spring is welded at the front end of the installation bin, the horizontal length L1 of the installation bin is consistent with the length of the spring in a free state and is set to be 5-15 cm, the tail end of the spring is welded on the end face of one side of the conductive block, the horizontal length of the conductive block is consistent with the horizontal length L3 of the charging plate, and the horizontal length L2 of the slide way is set to be 250-300% of the horizontal length of the conductive block.

Preferably, the electromagnetic conversion device comprises a metal column with a central axis coinciding with the central axis of the spring, a coil is wound on the metal column and fixedly mounted in the mounting groove z, the metal column is connected in an expanding mode and wound for 5-10 circles and fixedly mounted with the metal column, one end of the coil is connected with a dry battery through a third wire, the other end of the coil is connected with a press switch through a fourth wire, and the press switch is connected with the dry battery through a fifth wire.

As preferred, the receiving head device including install with the mounting panel of the sixth electric wire that the second electric wire link to each other, mounting panel one end be provided with the chute mutually support the insertion component, the insertion component periphery be provided with sealing rubber, the sealing rubber front end be provided with set up in fill electric pile terminal surface on the sealing ring of recess mutually supporting, the mounting panel other end be provided with the erection column, the erection column on install the lifting rod, lifting rod one side be provided with and pierce through the bleeder vent of mounting panel, the bleeder vent on install the jam piece, just the jam piece set up in the lifting rod under.

Preferably, the inserting assembly comprises inserting blocks which are fixedly installed on the installing plate and are symmetrically distributed, the inserting blocks are matched with the running grooves, seventh electric wires connected with the sixth electric wires are arranged in the inserting blocks, a hinge column is fixedly installed on one side of each inserting block, a limiting plate is arranged at the front end of the hinge column, a gear meshed with the first gear teeth is hinged to the hinge column, a metal block is arranged at the front end of each inserting block, and one end of the metal block is connected with the seventh electric wires.

Preferably, the locking device comprises a locking block, one end of the locking block is provided with an inclined plane, the tail end of the inclined plane is provided with a locking edge meshed with the gear, the upper end of the locking block is provided with a locking block ascending channel, an elastic piece is arranged in the locking block ascending channel, a lifting column is arranged at the central position of the elastic piece, the lower end of the lifting column is fixedly arranged on the locking block, the upper end of the lifting column is provided with a lifting handle, and a limiting column is arranged below the lifting handle; the locking device further comprises two limiting grooves matched with the limiting columns, the two limiting grooves are symmetrically distributed, and the circle centers of the two limiting grooves are located on the same straight line.

Compared with the prior art, the invention has the advantages that:

1. the conductive device is matched with the electromagnetic conversion device for use, magnetic force is generated by electrifying, the conductive device is adsorbed, the storage battery and the main power supply are conducted to charge the new energy automobile, the receiving head device is prevented from being directly contacted with the charging panel, and the charging device is safer to use.

2. The receiving head device is adsorbed on the surface of the charging pile after being compressed by the sealing rubber, so that the external environment and the charging position are isolated, the safety is ensured, and the receiving head device can be used for isolating rainwater in rainy days.

3. According to the locking device provided by the invention, the lifting handle can lift the lifting column and further lift the locking block, so that the locking block can be reversed, the direction of the inclined plane is changed, and the receiving head device can run towards one direction to lock the receiving head device.

Drawings

Fig. 1 is a structural diagram of a charging device suitable for a new energy vehicle according to the present invention.

Fig. 2 is a perspective sectional view of the charging device suitable for the new energy vehicle provided by the invention.

Fig. 3 is an enlarged view of the position F provided by the present invention.

Fig. 4 is a partially enlarged view of the charging device suitable for the new energy vehicle provided by the invention.

Fig. 5 is a diagram of internal components of the charging device suitable for the new energy automobile provided by the invention.

Fig. 6 is a perspective sectional view of a receiving head device provided by the present invention.

In the figure, a charging pile 1, a mounting bin 11, a slide way 12, a charging plate 13, a main power supply 14, an operation groove 15, a storage battery 16, a groove 17, a first electric wire D1, a second electric wire D2, a first gear tooth A, a conducting device 2, a spring 21, a conducting block 22, an electromagnetic conversion device 3, a metal column 31, a coil 32, a dry battery 33, a press switch 34, a third electric wire D3, a fourth electric wire D4, a fifth electric wire D5, a receiving head device 4 and a mounting plate 41, the device comprises sealing rubber 42, a sealing ring 43, a mounting column 44, a lifting rod 45, an air hole 46, a blocking block 47, an inserting assembly C, an inserting block C1, a hinge column C2, a limiting plate C3, a gear C4, a metal block C5, a sixth electric wire D6, a seventh electric wire D7, a locking device 5, a locking block 51, an inclined plane 52, a locking edge 53, a locking block ascending channel 54, an elastic piece 55, a lifting column 56, a lifting handle 57, a limiting column 58 and a limiting groove 59.

Detailed Description

As shown in fig. 1, 2, 3, 4, 5, 6, a charging device suitable for a new energy automobile comprises a charging pile 1 provided with a mounting bin 11, a slide 12 is arranged at the front end of the mounting bin 11, two symmetrically distributed conductive devices 2 are arranged in the slide 12, in the device, the mounting bin 11 can be set to be cylindrical, the diameter of the mounting bin 11 can be set to be 5-10 cm, the slide 12 can be set to be rectangular with a square cross section, the height (i.e. the side length of the square) of the slide 12 can be set to be 120% -130% of the diameter of the mounting bin 11, the horizontal length L2 of the slide 12 and the horizontal length L1 of the mounting bin 11 are set according to the size of the conductive devices 2, a charging plate 13 is arranged below each conductive device 2, the charging plate 13 is connected with a main power supply 14 arranged below the charging plate 13 through a first electric wire D1, the charging plate 13 in the device is arranged at the foremost end of the slide 12, the horizontal length L3 of the charging plate 13 can be set to be 3-8 cm, the electromagnetic conversion device 3 is arranged between the two conductive devices 2, the electromagnetic conversion device 3 is arranged in a cylindrical mounting groove z arranged in the charging pile 1, and the diameter of the mounting groove z can be set to be 100% -110% of the diameter of the mounting bin 11; the installation bin 11 is further provided with two symmetrically distributed operation grooves 15 on one side, the operation grooves 15 are arranged on one side of the conducting device 2, first gear teeth A are arranged below the operation grooves 15, a receiving head device 4 is installed at the upper end of the first gear teeth A, the front end of the receiving head device 4 is connected with a storage battery 16 of the new energy automobile through a second electric wire D2, a locking device 5 is arranged above the receiving head device 4, the size of the operation grooves 15 is set according to the receiving head device 4, a boss y used for supporting the receiving head device 4 is further arranged on one side of the first gear teeth A, and the boss y is higher than the first gear teeth A.

Specifically, the conductive device 2 includes a spring 21 fixedly installed in the installation bin 11, the spring 21 is installed horizontally, a conductive block 22 matched with the slideway 12 is fixedly installed at the front end of the spring 21, in the device, the spring 21 is formed by bending metal with good expansion and contraction performance, the front end of the spring is welded at the front end of the installation bin 11, the horizontal length L1 of the installation bin 11 is consistent with the horizontal length L3 of the charging plate 13 when the spring 21 is in a free state and can be set to be 5-15 cm, the tail end of the spring 21 is welded on one side end face of the conductive block 22, the horizontal length of the conductive block 22 is consistent with the horizontal length L3 of the charging plate 13, the horizontal length L2 of the slideway 12 can be set to be 250% -300% of the horizontal length of the conductive block 22, when the spring 21 is in a free state, the conductive block 22 is located at the tail end of the installation bin 11 and is separated from the charging, the spring 21 is extended, the conductive block 22 is positioned at the tail end of the slide way 12 and is contacted with the charging plate 13, in addition, the diameter of the spring 21 is set to be 80% -90% of the diameter of the installation bin 11, and the slide way 12 is in clearance fit with the conductive block 22.

Further, the electromagnetic conversion device 3 includes a metal column 31 with a central axis coinciding with a central axis of the spring 21, a coil 32 is wound on the metal column 31, the metal column 31 in the device is fixedly installed in the installation groove z, the installation mode can adopt expansion joint, the coil 32 can be wound by 5-10 circles and is fixedly installed together with the metal column 31, one end of the coil 32 is connected with a dry battery 33 through a third wire D3, the other end of the coil 32 is connected with a press switch 34 through a fourth wire D4, the press switch 34 and the dry battery 33 are connected through a fifth wire D5, and the press switch 34, the coil 32 and the dry battery 33 in the device are connected in series to form a closed loop through a third wire D3, a fourth wire D4 and a fifth wire D5.

Specifically, the receiving head device 4 includes a mounting plate 41 provided with a sixth electric wire D6 connected with a second electric wire D2, the mounting plate 41 in the device is made of an insulating material and high in hardness, such as PPS plastic and PC/ABS, the mounting plate 41 is internally and fixedly provided with the sixth electric wire D6, one end of the mounting plate 41 is provided with an insertion component C matched with the operation groove 16, the periphery of the insertion component C is provided with a sealing rubber 42, the front end of the sealing rubber 42 is provided with a sealing ring 43 matched with a groove 17 arranged on the end face of the charging pile 1, one end of the sealing rubber 42 in the device is adhered to one side of the mounting plate 41, the sealing rubber 42 is arranged in an arc shape with the diameter decreasing from the direction of the sealing ring 43 of the mounting plate 41, the thickness of the sealing rubber 42 can be set to 3-6 mm, the depth of the groove 17 can be set to 5-15 mm, the mounting panel 41 other end is provided with the erection column 44, install lifting rod 45 on the erection column 44, lifting rod 45 one side is provided with the bleeder vent 46 that pierces through mounting panel 41, install on the bleeder vent 46 and block 47, and block 47 and set up under lifting rod 45, the height of erection column 44 can set up to 5 ~ 10cm in this device, erection column 44 can adopt the metal material preparation, it is used for connecting lifting rod 45 to be provided with the screw thread on the outer disc of erection column 44, when lifting rod 45 locks, lifting rod 45 just in time is located bleeder vent 46 directly over, bleeder vent 46 can set up 1 ~ 2, bleeder vent 46 diameter can set up to 3 ~ 5cm, block 47 can adopt threaded connection's mode to install on bleeder vent 46, also can adopt expanded joint's mode to install.

Specifically, the inserting assembly C comprises inserting blocks C1 which are fixedly mounted on the mounting plate 41 and symmetrically distributed, the inserting block C1 in the device can be consistent with the material of the mounting plate 41, the connection between the mounting plate 41 and the inserting block C1 is in an adhesive manner, the inserting block C1 is matched with the running groove 16, a seventh wire D7 connected with a sixth wire D6 is arranged in the inserting block C1, a hinge column C2 is fixedly mounted on one side of the inserting block C1, a limit plate C3 is arranged at the front end of the hinge column C2, the diameter of the hinge column C2 can be set to be 70% -80% of the diameter of the inserting block C1, the diameter of the limit plate C3 can be set to be 110% -120% of the diameter of the hinge column C2, a gear C4 which is mutually meshed with the first gear tooth a is further hinged on the hinge column C2, the diameter of the gear C4 can be set to be 110% -120% of the height of the inserting block C1, a metal block C5 is further arranged at the front end, and one end of the metal block, the metal block C5 is expanded or adhered to the front end of the insertion block C1, and in addition, the sixth electric wire D6, the seventh electric wire D7 and the second electric wire D2 are connected into a lead, and the front end of the lead is connected with the metal block C5.

Further, the locking device 5 includes a locking block 51, one end of the locking block 51 is provided with an inclined surface 52, the end of the inclined surface 52 is provided with a locking edge 53 which is engaged with the gear C4, the upper end of the locking block 51 is provided with a locking block ascending channel 54, the inclined angle of the inclined surface 52 of the locking block 51 in the device is arranged according to the gear teeth of the gear C4, the locking edge 53 is contacted with the gear C4, the upper end of the inclined surface 52 is arranged to be rectangular or cylindrical, the locking block ascending channel 54 is arranged according to the locking block 51, the size of the locking block ascending channel 54 is 110% -120% of the maximum size (namely the longest side of the rectangle or the diameter of the cylinder) of the locking block 51, so that the locking block 51 can run and rotate in the locking block ascending channel 54, the locking block ascending channel 54 is provided with an elastic member 55, the elastic member 55 in the device can be arranged to be a spring or a, the lower end of an elastic piece 55 is arranged in a suspended mode, a lifting column 56 is arranged in the center of the elastic piece 55, the lower end of the lifting column 56 is fixedly mounted on a locking block 51, a lifting handle 57 is arranged at the upper end of the lifting column 56, a limiting column 58 is arranged below the lifting handle 57, the diameter of the lifting column 56 in the device can be set to be 3-8 cm, the connecting mode between the lifting column 56 and the locking block 51 is welded or screwed, the lifting handle 57 can be circular or horizontal cylindrical, a limiting column 58 is welded at the lower end of the lifting handle 57, and the diameter of the limiting column 58 can be set to be 10% -30% of the diameter of the lifting column 56; the locking device 5 further comprises two limiting grooves 59 matched with the limiting columns 58, the two limiting grooves 59 are symmetrically distributed, the circle centers of the two limiting grooves 59 are located on the same straight line, and the limiting grooves 59 and the limiting columns 58 in the locking device are matched in an intermittent mode.

The working principle is as follows: pulling the handle 57 to pull the locking block 51 upwards, rotating the locking device 5, aligning the inclined plane 52 with one side of the receiving head device 4, releasing the locking device 5, making the limit post 58 match with the limit groove 59 on one side, holding the pull rod 45, aligning the inserting component C with the operation groove 15, making the gear C4 mesh with the first gear tooth a and move forwards, because the inclined plane 52 aligns with one side of the receiving head device 4, fixing the locking block 51 without influencing the insertion of the inserting component C, and the locking edge 53 can prevent the receiving head device 4 from running reversely, thereby preventing the receiving head device 4 from falling off, at the same time, the sealing ring 43 and the groove 17 match with each other, pressing the pull rod 45 towards the inserting direction of the inserting component C, the sealing rubber 42 deforms under the pressing effect, the pressure is reduced, the air pressure inside the sealing rubber 42 is smaller than the external atmospheric pressure, so that the receiving head device 4 is tightly attached to the charging pile 1, the device can ensure safety in insulation and isolate the entering of external moisture, so that the device is suitable for rainy days, the blocking block 47 is arranged on one side of the lifting rod 45 to prevent the blocking block from loosening under the pressure change, then the press switch 34 is pressed to conduct the loop of the electromagnetic conversion device 3, the coil 32 is electrified to enable the metal column 31 to generate magnetic force and adsorb the conducting block 22, the conducting block 22 is communicated with the metal block C5 and the charging plate 13 to charge the storage battery 16, after the charging is completed, the press switch 34 is pressed to disconnect the loop of the electromagnetic conversion device 3, the coil 32 is powered off to enable the magnetic force of the metal column 31 to disappear, the conducting block 22 returns to the tail end of the mounting bin 11 under the action of the restoring force of the spring 21 to disconnect the metal block C5 and the charging plate 13, the lifting handle 57 is pulled to lift the locking block 51 upwards, the locking device 5 is rotated, and the inclined plane 52 is back to one side of the receiving head device 4, the locking device 5 is then lowered, and at the same time, the lifting rod 45 is rotated by a certain angle, and the blocking block 47 is then removed, so that the receiving head device 4 is conveniently removed.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the charging pile 1, the mounting bin 11, the chute 12, the charging plate 13, the main power supply 14, the operation groove 15, the storage battery 16, the groove 17, the first electric wire D1, the second electric wire D2, the first gear tooth a, the conductive device 2, the spring 21, the conductive block 22, the electromagnetic conversion device 3, the metal post 31, the coil 32, the dry battery 33, the push switch 34, the third electric wire D3, the fourth electric wire D4, the fifth electric wire D5, the receiving head device 4, the mounting plate 41, the sealing rubber 42, the sealing ring 43, the mounting post 44, the lifting rod 45, the vent hole 46, the blocking block 47, the insertion component C, the insertion block C1, the hinge post C2, the limit plate C3, the gear C4, the metal block C5, the sixth electric wire D6, the seventh electric wire D7, the locking device 5, the locking block 51, the slope 52, the locking edge 53, the locking block ascending channel 54, the elastic piece 55, the lifting post 56, the handle 57, the handle ascending channel 54, Stop post 58, stop slot 59, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention and they are to be interpreted as any additional limitation which is not in accordance with the spirit of the present invention.

Claims

1. The utility model provides a charging device suitable for new energy automobile, is including being equipped with electric pile (1) of filling of installation storehouse (11), its characterized in that: a slide way (12) is arranged at the front end of the installation bin (11), two symmetrically distributed conducting devices (2) are installed in the slide way (12), a charging plate (13) is arranged below each conducting device (2), the charging plate (13) is connected with a main power supply (14) arranged below the charging plate (13) through a first electric wire (D1), and an electromagnetic conversion device (3) is arranged between the two conducting devices (2); installation storehouse (11) one side still be provided with running groove (15) of two symmetric distributions, just running groove (15) set up in electrically conductive device (2) one side, running groove (15) below be provided with first teeth of a cogwheel (A), first teeth of a cogwheel (A) upper end install receiving head device (4), just receiving head device (4) front end pass through second electric wire (D2) and link to each other with new energy automobile's battery (16), receiving head device (4) top be provided with locking device (5).

2. The charging device suitable for the new energy automobile according to claim 1, wherein: the utility model discloses a conductive device (2) including fixed mounting in installation storehouse (11) in spring (21), just spring (21) horizontal installation, spring (21) front end fixed mounting with slide (12) conductive block (22) of mutually supporting, spring (21) adopt the metal that the flexible performance is good to bend and form, the front end welding of spring is at the front end of installation storehouse (11), length keeps unanimous when the horizontal length L1 of installation storehouse (11) is in free state with spring (21), set up to 5 ~ 15cm, the terminal welding of spring (21) is on the terminal surface of one side of conductive block (22), the horizontal length of conductive block (22) keeps unanimous with the horizontal length L3 of charging board (13), the horizontal length L2 of slide (12) sets up to 250% ~ 300% of the horizontal length of conductive block (22).

3. The charging device suitable for the new energy automobile according to claim 2, wherein: electromagnetic conversion equipment (3) include the central axis with spring (21) the metal column (31) of the coincidence of central axis, metal column (31) on twine coil (32), metal column (31) fixed mounting is in mounting groove z, the mounting means adopts expanded joint, 5 ~ 10 circles of coil 32 winding to with metal column (31) admittedly, coil (32) one end be connected with dry battery (33) through third electric wire (D3), coil (32) other end be connected with press switch (34) through fourth electric wire (D4), just press switch (34) with dry battery (33) link to each other through fifth electric wire (D5).

4. The charging device suitable for the new energy automobile according to claim 1, wherein: the receiving head device (4) comprises a mounting plate (41) provided with a sixth electric wire (D6) connected with the second electric wire (D2), one end of the mounting plate (41) is provided with an insertion component (C) which is matched with the running groove (16), the periphery of the insertion component (C) is provided with a sealing rubber (42), the front end of the sealing rubber (42) is provided with a sealing ring (43) which is matched with a groove (17) arranged on the end surface of the charging pile (1), the other end of the mounting plate (41) is provided with a mounting column (44), the mounting column (44) is provided with a lifting rod (45), one side of the lifting rod (45) is provided with a vent hole (46) penetrating through the mounting plate (41), the vent hole (46) is provided with a blocking block (47), and the blocking block (47) is arranged at the right lower end of the lifting rod (45).

5. The charging device suitable for the new energy automobile according to claim 4, wherein: the inserting assembly (C) comprises inserting blocks (C1) which are fixedly installed on the installing plate (41) and symmetrically distributed, the inserting blocks (C1) are matched with the running groove (16), seventh electric wires (D7) connected with the sixth electric wires (D6) are arranged in the inserting blocks (C1), a hinged column (C2) is fixedly installed on one side of the inserting blocks (C1), a limiting plate (C3) is arranged at the front end of the hinged column (C2), a gear (C4) meshed with the first gear teeth (A) is hinged to the hinged column (C2), a metal block (C5) is further arranged at the front end of the inserting block (C1), and one end of the metal block (C5) is connected with the seventh electric wires (D7).

6. The charging device suitable for the new energy automobile according to claim 5, wherein: the locking device (5) comprises a locking block (51), one end of the locking block (51) is provided with an inclined surface (52), the tail end of the inclined surface (52) is provided with a locking edge (53) which is meshed with the gear (C4), the upper end of the locking block (51) is provided with a locking block ascending channel (54), an elastic part (55) is arranged in the locking block ascending channel (54), a lifting column (56) is arranged at the center of the elastic part (55), the lower end of the lifting column (56) is fixedly arranged on the locking block (51), the upper end of the lifting column (56) is provided with a lifting handle (57), and a limiting column (58) is arranged below the lifting handle (57); the locking device (5) further comprises two limiting grooves (59) matched with the limiting columns (58), the two limiting grooves (59) are symmetrically distributed, and the circle centers of the two limiting grooves (59) are located on the same straight line.