CN213744214U

CN213744214U - Hydraulic rear platform lifting synchronous balance system for passenger boarding vehicle with inconvenient mobility

Info

Publication number: CN213744214U
Application number: CN202022837455.2U
Authority: CN
Inventors: 单萍; 唐登远
Original assignee: Jiangsu Tianyi Airport Special Equipment Co ltd
Current assignee: Shanghai Swallow Technology & Trade Development Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-07-20
Anticipated expiration: 2030-11-30

Abstract

The utility model discloses a hydraulic pressure rear platform lift synchronous balance system of inconvenient passenger's boarding car of moving relates to hydraulic pressure accessory rational utilization and mechanical structure and reforms transform technical field. The utility model discloses a hydraulic cylinder, boarding car base, first base plate, second base plate, hydraulic cylinder's interior wall dress is equipped with the spring rand, and the dust ring has been installed to hydraulic cylinder's tip, and hydraulic cylinder's upper end is connected with two first oil circuits. The utility model discloses a two synchronous motors have been installed respectively on the first oil circuit that hydraulic cylinder stretched out and the first oil circuit of hydraulic cylinder shrink, two synchronous motors's upper end all is connected with two second oil circuits, the fracture department of second oil circuit all is connected with one-way choke valve, be convenient for make the hydraulic cylinder drive rear platform of boarding car rise with the carriage parallel and level when, the rear platform can arrive simultaneously, can be synchronous about the platform, and also can arrive ground simultaneously when hydraulic cylinder drive rear platform descends.

Description

Hydraulic rear platform lifting synchronous balance system for passenger boarding vehicle with inconvenient mobility

Technical Field

The utility model belongs to the technical field of hydraulic pressure accessory rational utilization and mechanical structure transform, especially relate to the hydraulic pressure rear platform lift synchronous balance system that the inconvenient passenger went on the board.

Background

The hydraulic back platform lifting synchronous balance system for passenger boarding vehicle is an automobile with raised carriage, butt-jointed with cabin door of airplane and capable of taking passenger to airplane, the lifting mechanism of lifting platform is driven by crank-link mechanism, and the two lifting platforms in front of airplane and behind the airplane are ensured to move synchronously by pull rod. In order to overcome the defect, the hydraulic elevator mechanism balance beam of our factory is improved to a certain extent. The method is convenient to adjust, reliable to fix and very practical, and the lifting mechanism is a plane low-pair mechanism for bearing tensile and pressure loads. Because of a certain gap, under the impact action of dynamic load, the abrasion of each joint is intensified, so that the lubrication is reinforced to prevent water and oxidation slag from entering, when the copper tile abrasion of each joint reaches a certain gap, the copper tile abrasion needs to be replaced in time, the lifting platform acts frequently, the impact load is large, the connecting bolts of all parts in the lifting mechanism are easy to loosen and break, and the ootheca filaments are easy to fatigue and lose efficacy under the action of alternating load, tension and pressure and the like. Therefore, the screws are fastened and replaced regularly, especially the connecting rod jaw shoe screws.

When the platform rises to be flush with the carriage after being driven by the hydraulic oil cylinder of the passenger boarding vehicle, passengers cannot arrive at the platform at the same time, the left platform and the right platform cannot be synchronized, the height deviation is about 50mm, and when the platform descends, the platforms cannot arrive at the ground at the same time, the left platform and the right platform cannot be synchronized, the height deviation is about 50mm, so that passengers are not changed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a hydraulic rear platform lifting synchronous balance system of a passenger boarding vehicle with inconvenient mobility, two synchronous motors are respectively arranged on a first oil path extending out through a hydraulic oil cylinder and a first oil path contracting the hydraulic oil cylinder, the upper ends of the two synchronous motors are both connected with two second oil paths, the fracture of the second oil path is connected with a one-way throttle valve, when the rear platform is driven by the hydraulic oil cylinder of the boarding vehicle to rise to be flush with a carriage, the rear platform can arrive at the same time, the left and the right of the platform can be synchronous, and when the rear platform is driven by the hydraulic oil cylinder to descend, the platform can arrive at the ground at the same time, the left and the right can be synchronous, thereby facilitating boarding of passengers with inconvenient mobility, the synchronous motors not only play a synchronous role, but also reduce the impact pressure of the oil paths, the platform can move stably, the platform can ascend and descend to stably and accurately reach the position, springs are arranged on the relative inner sides of the hydraulic oil cylinders, the piston is matched with the hydraulic oil cylinder in a sliding mode, so that when one piston contacts the spring first, the speed of the hydraulic oil cylinder is reduced immediately, the hydraulic oil cylinder is synchronous, the platform rises and falls stably and accurately to reach the position, and the problems in the prior art are solved.

In order to achieve the purpose, the utility model is realized by the following technical proposal:

a hydraulic rear platform lifting synchronous balance system of a passenger boarding vehicle inconvenient to move comprises a hydraulic oil cylinder, a boarding vehicle base, a first base plate and a second base plate, wherein a spring retainer ring is arranged on the inner wall of the hydraulic oil cylinder, a dust ring is arranged at the end part of the hydraulic oil cylinder, two first oil ways are connected to the upper end of the hydraulic oil cylinder, two synchronous motors are respectively arranged on the first oil way extending out of the hydraulic oil cylinder and the first oil way contracting the hydraulic oil cylinder, two second oil ways are respectively connected to the upper ends of the two synchronous motors, a fracture of each second oil way is connected with a one-way throttle valve, a one-way valve and an overflow valve, single-action hydraulic cylinders are respectively arranged at the end parts of the two second oil ways, springs are respectively arranged on the opposite inner sides of the hydraulic oil cylinder, and pistons are matched in the hydraulic oil cylinder in a sliding manner;

the boarding vehicle comprises a boarding vehicle base, a first base plate, a second base plate, a first rotating shaft, a second rotating shaft, a third rotating shaft, a first limit ring, a second limit ring, a third limit ring, a guide sleeve, a first notch, a second notch, a third notch, a first notch, a second notch, a third notch, a first rotating shaft, a second rotating shaft, a third rotating shaft, a fourth rotating shaft, a third rotating shaft, a second rotating shaft, a third rotating shaft, a second rotating shaft, a third rotating shaft, a third shaft, a second rotating shaft, a third shaft, a second shaft, a third, the first notch is internally provided with a proximity switch, the upper end of the second substrate is provided with a second notch, and the second notch is internally matched with an automatic door in a sliding way.

Optionally, four first rectangular grooves are formed in the upper end of the boarding vehicle base, first circular grooves are formed in the opposite inner sides of the four first rectangular grooves, four first arc-shaped blocks are arranged in the four first rectangular grooves in a rotating fit mode respectively, two third rotating shafts are arranged on the opposite outer sides of the first arc-shaped blocks, the peripheral sides of the two third rotating shafts are in rotating fit in the first circular grooves respectively, and the four first arc-shaped blocks are arranged at the lower ends of the four convex strips respectively.

Optionally, four second rectangular grooves are formed in the lower end of the first substrate, second circular grooves are formed in the opposite inner sides of the four second rectangular grooves, four second arc-shaped blocks are arranged in the four second rectangular grooves in a rotating fit mode respectively, two fourth rotating shafts are arranged on the opposite outer sides of the second arc-shaped blocks, the peripheral sides of the two fourth rotating shafts are arranged in the second circular grooves in a rotating fit mode respectively, and the four second arc-shaped blocks are arranged at the upper ends of the four convex strips respectively.

Optionally, the lower end of the boarding vehicle base is provided with four universal wheels.

Optionally, two first channels are formed in the upper end of the first substrate, and a first electric push rod and a second electric push rod are respectively installed at the bottom ends of the two first channels.

Optionally, the upper ends of the first electric push rod and the second electric push rod are respectively in sliding fit with the first grating and the second grating.

Optionally, the outer sides of the first and second grids are respectively and fixedly mounted at the end portions of the first and second electric push rods.

Optionally, a third channel is formed in the upper end of the first substrate, and the third grating is fixedly installed in the third channel.

Optionally, fourth channel, fifth channel, sixth channel have been seted up to the lower extreme of second base plate, and first step groove has all been seted up to the relative inboard of fourth channel, fifth channel, and the wheel has all been installed to the second step groove, the relative outside of first grid, second grid, and wheel sliding fit is at first step groove, second step groove, third grid fixed mounting is in the sixth channel.

Optionally, the upper end of the first substrate is provided with a third notch, and the lower end of the automatic door is in sliding fit with the third notch.

The embodiment of the utility model has the following beneficial effect:

1. the utility model has the advantages that the two synchronous motors are respectively arranged on the first oil path extending out of the hydraulic oil cylinder and the first oil path contracting the hydraulic oil cylinder, the upper ends of the two synchronous motors are respectively connected with the two second oil paths, the fracture of the second oil path is respectively connected with the one-way throttle valve, when the hydraulic oil cylinder of the boarding vehicle drives the rear platform to rise to be flush with the carriage, the rear platform can reach at the same time, the left and the right sides of the platform can be synchronous, and the rear platform driven by the hydraulic oil cylinder can reach the ground at the same time when descending, the left and the right sides can be synchronous, thereby being convenient for passengers with inconvenient actions to board, the synchronous motors not only play a synchronous role, but also reduce the impact pressure of the oil paths, lead the platform to stably move, lead the platform to rise and descend to stably and accurately reach the position, the springs are respectively arranged on the opposite inner sides of the hydraulic oil cylinder, and the pistons are in sliding fit in the hydraulic oil cylinder, when a piston contacts the spring first, the speed of the hydraulic oil cylinder is reduced immediately so as to synchronize, and the platform is lifted and lowered stably and accurately to reach the position.

2. The utility model discloses an embodiment has first grid through the upper end sliding fit of first base plate, the second grid, the third grid has been installed to the upper end of first base plate, be convenient for first grid, the second grid links to each other with the gate, protect the personnel's safety of boarding, reduce the probability that the personnel's high altitude of boarding falls, the security of this boarding car has been promoted, still play the ventilation effect, through the built-in proximity switch that is equipped with of first notch, the second notch has been seted up to the upper end of second base plate, sliding fit has the automatically-controlled door in the second notch, be convenient for when first base plate and gate are neat at ordinary times, proximity switch auto-induction contact state, then open automatically-controlled door sliding fit in the second notch, make the inconvenient more convenient passenger of action on the first base plate board.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a sectional view of a platform lifting hydraulic cylinder according to an embodiment of the present invention;

fig. 2 is a schematic view of a platform system according to an embodiment of the present invention;

fig. 3 is a schematic view of a three-dimensional structure of a boarding vehicle according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of the upper end of the hydraulic cylinder of the present invention with the guide sleeve rotatably fitted around the second rotating shaft;

fig. 5 is a cross-sectional view of the first and second grids slidably fitted on the upper end of the first base plate according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of the lower end of the automatic door of an embodiment of the present invention being slidably fitted in the third notch;

fig. 7 is a cross-sectional view of four first arc-shaped blocks respectively rotatably fitted in four first rectangular grooves according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

the boarding vehicle comprises a hydraulic oil cylinder 1, a boarding vehicle base 2, a first base plate 3, a second base plate 4, a spring retainer ring 5, a dust ring 6, a first oil path 7, a synchronous motor 8, a second oil path 9, a one-way throttle valve 10, a one-way valve 11, an overflow valve 12, a single-action hydraulic cylinder 13, a spring 14, a piston 15, a convex strip 16, a guide sleeve 17, a first rotating shaft 18, a first limiting ring 19, a second rotating shaft 20, a second limiting ring 21, a third limiting ring 22, a first grating 23, a second grating 24, a third grating 25, a proximity switch 26, an automatic door 27, a first rectangular groove 28, a first arc-shaped block 29, a third rotating shaft 30, a universal wheel 31, a first channel 32, a first electric push rod 33, a second electric push rod 34, a third channel 35 and a third channel 36.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

To maintain the following description of the embodiments of the present invention clear and concise, detailed descriptions of well-known functions and components may be omitted.

Referring to fig. 1 to 7, in the present embodiment, a hydraulic rear platform lifting synchronous balancing system for a passenger boarding vehicle with inconvenient movement is provided, which includes: the boarding vehicle comprises a hydraulic oil cylinder 1, a boarding vehicle base 2, a first base plate 3 and a second base plate 4, wherein a spring retainer ring 5 is arranged on the inner wall of the hydraulic oil cylinder 1, a dust ring 6 is arranged at the end part of the hydraulic oil cylinder 1, the upper end of the hydraulic oil cylinder 1 is connected with two first oil ways 7, two synchronous motors 8 are respectively arranged on the first oil way 7 extending out of the hydraulic oil cylinder 1 and the first oil way 7 contracting the hydraulic oil cylinder 1, the upper ends of the two synchronous motors 8 are respectively connected with two second oil ways 9, the fracture of the second oil ways 9 is respectively connected with a one-way throttle valve 10, a one-way valve 11 and an overflow valve 12, the end parts of the two second oil ways 9 are respectively provided with a single-action hydraulic cylinder 13, the opposite inner sides of the hydraulic oil cylinder 1 are respectively provided with a spring 14, and a piston 15 is in sliding fit in the hydraulic oil cylinder 1;

the boarding vehicle base 2 is provided with four convex strips 16 at the upper end in a rotating fit manner, the four convex strips 16 are arranged in a pairwise crossing manner, a turntable is arranged between the two crossed convex strips 16, the upper ends of the four convex strips 16 are in a rotating fit manner at the lower end of a first base plate 3, two ends of a hydraulic oil cylinder 1 are respectively provided with a guide sleeve 17, two opposite outer sides of the boarding vehicle base 2 are respectively provided with two first rotating shafts 18, the peripheral side of each first rotating shaft 18 is sleeved with a first limiting ring 19, the opposite outer sides of the four convex strips 16 are respectively provided with a second rotating shaft 20, the peripheral side of each second rotating shaft 20 is sleeved with a second limiting ring 21 and a third limiting ring 22, the guide sleeve 17 at the upper end of the hydraulic oil cylinder 1 is in a rotating fit manner at the peripheral side of the second rotating shaft 20, the guide sleeve 17 at the lower end of the hydraulic oil cylinder 1 is in a rotating fit manner at the peripheral side of the first rotating shaft 18, the upper end of the first base plate 3 is in a sliding fit manner with a first grating 23 and a second grating 24, the third grid 25 is installed to the upper end of first base plate 3, and first notch has been seted up to one side of first base plate 3, and the built-in proximity switch 26 that is equipped with of first notch, and the second notch has been seted up to the upper end of second base plate 4, and sliding fit has automatically-controlled door 27 in the second notch.

The application of one aspect of the embodiment is as follows: two synchronous motors 8 and four one-way throttle valves 10 are respectively arranged on a first oil way 7 extending out of a hydraulic oil cylinder 1 and a first oil way 7 contracting the hydraulic oil cylinder 1 to achieve the purpose of synchronization, a spring 14 is arranged in the hydraulic oil cylinder 1, when a piston 15 in one hydraulic oil cylinder 1 contacts the spring 14 first, the speed of the hydraulic oil cylinder 1 is immediately reduced so as to achieve synchronization, a rear platform lifts the hydraulic oil cylinder 1 in a model D40/30-1400, a rear platform overturns the hydraulic oil cylinder in a model D40/22-515, the synchronous motors 8 not only play a role of synchronization, but also reduce the impact pressure of the oil way to enable the platform to stably move, the platform is lifted and descended to stably and accurately reach a position through three aspects of technical transformation, when the hydraulic oil cylinder 1 is opened, a guide sleeve 17 at the upper end of the hydraulic oil cylinder 1 is rotatably matched on the peripheral side of a second rotating shaft 20, a guide sleeve 17 at the lower end of the hydraulic oil cylinder 1 is rotatably matched on the peripheral side of a first rotating shaft 18, therefore, the inclination angles of the four convex strips 16 are changed, the first substrate 3 is further lifted, passengers with inconvenient actions on the first substrate 3 can board more conveniently, when the first substrate 3 is level with a boarding gate, the proximity switch 26 automatically senses the contact state, then the automatic door 27 is opened and is in sliding fit in the second slot, then the first grating 23 and the second grating 24 are in sliding fit at the upper end of the first substrate 3, the first grating 23 and the second grating 24 are connected with the boarding gate, the safety of boarding personnel is protected, and the probability of high-altitude falling of the boarding personnel is reduced. It should be noted that the synchronous motor 8, the proximity switch 26 and the automatic door 27 referred to in this application may be powered by a battery or an external power source.

Two synchronous motors 8 are respectively arranged on a first oil way 7 extending out of a hydraulic oil cylinder 1 and a first oil way 7 contracting the hydraulic oil cylinder 1, the upper ends of the two synchronous motors 8 are respectively connected with two second oil ways 9, the fracture of each second oil way 9 is respectively connected with a one-way throttle valve 10, so that when a hydraulic oil cylinder 1 of a boarding vehicle drives a rear platform to rise to be flush with a carriage, the rear platform can arrive at the same time, the left side and the right side of the platform can be synchronous, and the rear platform can also arrive at the ground simultaneously when the hydraulic oil cylinder 1 drives the rear platform to descend, the left side and the right side can be synchronous, thereby facilitating boarding of passengers with inconvenient actions, the synchronous motors 8 not only play a role of synchronization, but also reduce the impact pressure of the oil ways, enable the platform to stably move, enable the platform to rise and descend to stably and accurately reach positions, springs 14 are respectively arranged on the opposite inner sides of the hydraulic oil cylinder 1, and pistons 15 are in sliding fit in the hydraulic oil cylinder 1, when a piston 15 contacts the spring 14 first, the speed of the hydraulic oil cylinder 1 is reduced immediately so as to be synchronous, the platform is enabled to ascend and descend stably and accurately to reach the position, a first grid 23 and a second grid 24 are matched at the upper end of a first base plate 3 in a sliding mode, a third grid 25 is arranged at the upper end of the first base plate 3 so that the first grid 23 and the second grid 24 can be connected with a boarding gate conveniently, the safety of boarding personnel is protected, the probability of high-altitude falling of the boarding personnel is reduced, the safety of the boarding gate is improved, the ventilation effect is achieved, a proximity switch 26 is arranged in the first notch, a second notch is formed in the upper end of a second base plate 4, an automatic door 27 is matched in the second notch in a sliding mode, when the first base plate 3 and the boarding gate are flush, the proximity switch 26 automatically senses the contact state, then the automatic door 27 is opened and is matched in the second notch in a sliding mode, the passengers with inconvenient actions on the first substrate 3 can board more conveniently.

Four first rectangular grooves 28 are formed in the upper end of the boarding car base 2 in the embodiment, first circular grooves are formed in the opposite inner sides of the four first rectangular grooves 28, four first arc-shaped blocks 29 are respectively and rotatably matched in the four first rectangular grooves 28, two third rotating shafts 30 are arranged on the opposite outer sides of the first arc-shaped blocks 29, the peripheral sides of the two third rotating shafts 30 are respectively and rotatably matched in the first circular grooves, and the four first arc-shaped blocks 29 are respectively arranged at the lower ends of the four convex strips 16.

Four second rectangular channels have been seted up to the lower extreme of the first base plate 3 of this embodiment, and the second circular recess has all been seted up to the relative inboard of four second rectangular channels, and the difference normal running fit has four second arc pieces in four second rectangular channels, and two fourth pivots have been installed in the relative outside of second arc piece, and the week side normal running fit of two fourth pivots is in the second circular recess respectively, and four second arc pieces are installed respectively in the upper end of four sand grips 16.

Four universal wheels 31 are mounted on the lower end of the boarding vehicle base 2 of the present embodiment.

In the embodiment, two first grooves 32 are formed at the upper end of the first substrate 3, and a first electric push rod 33 and a second electric push rod 34 are respectively installed at the bottom ends of the two first grooves 32.

The first and

second grids

23 and 24 are respectively slidably fitted to the upper ends of the first and second electric push rods 33 and 34 in this embodiment.

In the present embodiment, the outer sides of the first and

second grids

23 and 24 are fixedly mounted on the ends of the first and second electric push rods 33 and 34, respectively.

In this embodiment, the upper end of the first substrate 3 is provided with a third channel 35, and the third grid 25 is fixedly installed in the third channel 35.

Fourth channel, fifth channel, sixth channel have been seted up to the lower extreme of the second base plate 4 of this embodiment, and first step groove has all been seted up to the relative inboard of fourth channel, fifth channel, and the wheel has all been installed to the second step groove, the relative outside of first grid 23, second grid 24, and wheel sliding fit is at first step groove, second step groove, third grid 25 fixed mounting is in the sixth channel.

In the present embodiment, the upper end of the first base plate 3 is opened with a third notch 36, and the lower end of the automatic door 27 is slidably fitted in the third notch 36.

The above embodiments may be combined with each other.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Claims

1. The hydraulic rear platform lifting synchronous balance system of the passenger boarding vehicle with inconvenient movement is characterized by comprising: the boarding vehicle comprises a hydraulic oil cylinder (1), a boarding vehicle base (2), a first base plate (3) and a second base plate (4), wherein a spring retainer ring (5) is arranged on the inner wall of the hydraulic oil cylinder (1), a dust ring (6) is arranged at the end part of the hydraulic oil cylinder (1), two first oil ways (7) are connected to the upper end of the hydraulic oil cylinder (1), two synchronous motors (8) are respectively arranged on the first oil way (7) extended out of the hydraulic oil cylinder (1) and the first oil way (7) contracted by the hydraulic oil cylinder (1), two second oil ways (9) are respectively connected to the upper ends of the two synchronous motors (8), a one-way throttle valve (10), a one-way valve (11) and an overflow valve (12) are respectively connected to the fracture part of the second oil way (9), a single-action hydraulic cylinder (13) is respectively arranged at the end part of each of the two second oil ways (9), and springs (14) are respectively arranged on the opposite inner sides of the hydraulic oil cylinder (1), a piston (15) is in sliding fit with the hydraulic oil cylinder (1);

the boarding vehicle comprises a boarding vehicle base (2), four convex strips (16) which are rotationally matched at the upper end of the boarding vehicle base (2), wherein the four convex strips (16) are arranged in a pairwise intersecting manner, a turntable is arranged between the two intersecting convex strips (16), the upper ends of the four convex strips (16) are rotationally matched at the lower end of a first base plate (3), two ends of a hydraulic oil cylinder (1) are respectively provided with a guide sleeve (17), two first rotating shafts (18) are respectively arranged at the opposite outer sides of the boarding vehicle base (2), a first limiting ring (19) is sleeved at the peripheral side of each first rotating shaft (18), a second rotating shaft (20) is respectively arranged at the opposite outer sides of the four convex strips (16), a second limiting ring (21) and a third limiting ring (22) are respectively sleeved at the peripheral side of each second rotating shaft (20), the guide sleeves (17) of the hydraulic oil cylinder (1) are rotationally matched at the peripheral side of each second rotating shaft (20), the guide sleeves (17) at the lower end of the hydraulic oil cylinder (1) are rotationally matched at the peripheral side of each first rotating shaft (18), the upper end sliding fit of first base plate (3) has first grid (23), second grid (24), and third grid (25) have been installed to the upper end of first base plate (3), and first notch has been seted up to one side of first base plate (3), and built-in proximity switch (26) that is equipped with of first notch, the second notch has been seted up to the upper end of second base plate (4), and sliding fit has automatically-controlled door (27) in the second notch.

2. The hydraulic rear deck lift synchronous balancing system of a passenger boarding vehicle inconvenient in mobility according to claim 1, wherein four first rectangular grooves (28) are formed in the upper end of the boarding vehicle base (2), first circular grooves are formed in the opposite inner sides of the four first rectangular grooves (28), four first arc-shaped blocks (29) are respectively rotatably fitted in the four first rectangular grooves (28), two third rotating shafts (30) are mounted on the opposite outer sides of the first arc-shaped blocks (29), the peripheral sides of the two third rotating shafts (30) are respectively rotatably fitted in the first circular grooves, and the four first arc-shaped blocks (29) are respectively mounted at the lower ends of the four convex strips (16).

3. The hydraulic rear platform lift synchronous balancing system of a passenger boarding vehicle inconvenient in mobility according to claim 2, wherein four second rectangular grooves are formed in the lower end of the first base plate (3), second circular grooves are formed in the opposite inner sides of the four second rectangular grooves, four second arc-shaped blocks are respectively rotatably fitted in the four second rectangular grooves, two fourth rotating shafts are respectively fitted in the opposite outer sides of the second arc-shaped blocks, the peripheral sides of the two fourth rotating shafts are respectively rotatably fitted in the second circular grooves, and the four second arc-shaped blocks are respectively fitted in the upper ends of the four convex strips (16).

4. The hydraulic rear platform elevating synchronous balancing system for passenger boarding vehicle inconvenient in mobility according to claim 3, characterized in that the lower end of the boarding vehicle base (2) is provided with four universal wheels (31).

5. The hydraulic rear platform lifting synchronous balancing system of a passenger boarding vehicle with inconvenient movement according to claim 4, wherein the first base plate (3) is provided at an upper end thereof with two first channels (32), and the bottom ends of the two first channels (32) are respectively provided with a first electric push rod (33) and a second electric push rod (34).

6. The hydraulic rear platform lifting synchronous balancing system for passenger boarding vehicles with inconvenient actions as claimed in claim 5, wherein the upper ends of the first electric push rod (33) and the second electric push rod (34) are respectively matched with the first grating (23) and the second grating (24) in a sliding way.

7. The hydraulic rear platform lifting synchronous balancing system for passenger boarding vehicles with inconvenient actions as claimed in claim 6, wherein the outer sides of the first and second grilles (23, 24) are fixedly installed at the ends of the first and second electric push rods (33, 34), respectively.

8. The hydraulic rear platform lifting synchronous balancing system for passenger boarding vehicles with inconvenient actions as claimed in claim 7, wherein the upper end of the first base plate (3) is provided with a third channel (35), and the third grating (25) is fixedly installed in the third channel (35).

9. The hydraulic rear platform lifting synchronous balancing system of passenger boarding vehicle with inconvenient movement as claimed in claim 8, wherein the lower end of the second base plate (4) is provided with a fourth channel, a fifth channel and a sixth channel, the opposite inner sides of the fourth channel and the fifth channel are provided with a first step groove, the second step groove, the opposite outer sides of the first grating (23) and the second grating (24) are provided with wheels, and the wheels are slidably fitted in the first step groove, the second step groove and the third grating (25) are fixedly arranged in the sixth channel.

10. The hydraulic rear deck lift synchronous balancer system as claimed in claim 9, wherein the first base plate (3) is formed with a third notch (36) at an upper end thereof, and the lower end of the automatic door (27) is slidably fitted in the third notch (36).