Passenger door of passenger car and mounting method thereof

Abstract

The invention relates to the technical field of passenger car passenger doors, and discloses a passenger car passenger door and an installation method thereof.The passenger car passenger door comprises a car body and two car doors, rubber edges are arranged on the peripheries of the two car doors, and the two car doors are installed in a car frame of the car body through two parallel opening and closing assemblies correspondingly; a driving assembly for driving the parallel opening and closing assembly to move is arranged on the inner side of the vehicle body, a positioning assembly for positioning the opening and closing positions of the two vehicle doors is arranged on the inner side of the vehicle body, and the positioning assembly comprises a magnetic positioning mechanism and a photoelectric positioning mechanism. Preliminary sealing between the two vehicle doors and the vehicle body is achieved through the rubber edges, then secondary sealing between the two vehicle doors and the vehicle body is achieved through the auxiliary sealing assembly, waterproof and dustproof effects are achieved, warm air or cold air in the vehicle body is not prone to leaking, violent dismounting operation of the vehicle doors is achieved through the material ejecting assembly and the destructive assembly, and the vehicle door dismounting efficiency is improved. And the vehicle door can be manually opened, so that the safety is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of passenger doors for buses, and specifically provides a passenger door for a bus and an installation method thereof. Background Art

[0002] As the core passage for passengers to get on and off the bus, the design of the passenger door of the bus directly affects the safety, comfort and operation efficiency of the vehicle. Most existing buses adopt double-leaf passenger doors that open inward.

[0003] After retrieval, a Chinese patent with the publication number CN2513812Y discloses an improved opening and closing device for a double-leaf passenger door of a bus. This device is installed under the second step inside the passenger door of the bus. Two opening and closing cylinders are connected to the upright shaft of its frame. The piston rod of the cylinder is connected to the connecting rod arm and the balance rod that connect the frame and the passenger door. There is also a door connecting arm above the passenger door of the bus, which is connected to the support arm inside the upper door frame by a rotating shaft. This opening and closing device of the passenger door is completely placed on the back of the passenger door, which not only makes the opening and closing of the door convenient and smooth, but also makes it easy to seal the upper and lower ends of the door, ensuring the airtight performance of the passenger door of the bus. However, there are still the following problems in the use process: 1. Limited by the inherent characteristics of the mechanical link type opening and closing door structure, there are inevitably deviations when the two doors are closed. Even if a sealing ring is provided between the door and the vehicle body, its sealing performance still has certain limitations; 2. When an accident or sudden power failure occurs, it is often difficult to easily open the door, which will undoubtedly significantly reduce the escape probability of passengers and pose a potential threat to the life safety of passengers. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a passenger door for a bus and an installation method thereof, mainly to solve the problems that limited by the inherent characteristics of the mechanical link type opening and closing door structure, there are inevitably deviations when the two doors are closed. Even if a sealing ring is provided between the door and the vehicle body, its sealing performance still has certain limitations, and when an accident or sudden power failure occurs, it is often difficult to easily open the door, which will undoubtedly significantly reduce the escape probability of passengers and pose a potential threat to the life safety of passengers.

[0005] To achieve the above object, the present invention provides the following technical solutions: A passenger door for a bus, comprising a vehicle body and two doors. Rubber edges are provided around the two doors. The two doors are respectively installed in the door frame of the vehicle body through two parallel opening and closing assemblies. A driving assembly for driving the parallel opening and closing assemblies to move is provided inside the vehicle body. A positioning assembly for positioning the opening and closing positions of the two doors is provided inside the vehicle body. The positioning assembly includes a magnetic positioning mechanism and an optoelectronic positioning mechanism. A ejecting assembly for quickly disengaging the driving assembly from the parallel opening and closing assemblies is provided inside the vehicle body. Secondary sealing assemblies for secondary sealing between the doors and the vehicle body are provided on the outer sides of the two doors.

[0006] As a further solution of the present invention, the parallel opening and closing assembly includes two groups of upper bearing seats and blind plate bearing seats fixedly connected to the inner side of the vehicle body. Rotating shafts are provided between two opposite upper bearing seats and blind plate bearing seats. Two swing arms are fixedly connected to one side of the rotating shaft. One ends of the two swing arms are respectively rotationally connected to the doors through stainless steel universal ball heads. The tops and bottoms of the two doors are respectively rotationally connected to connecting arms through stainless steel universal ball heads, and the ends of the connecting arms are rotationally connected to the vehicle body through stainless steel universal ball heads.

[0007] As a further solution of the present invention, the driving assembly includes a chassis fixedly connected to the inner side of the vehicle body. A transverse guide rail is fixedly connected to the inner wall of one side of the chassis. A bidirectional threaded rod is rotationally connected to the inside of the chassis through a bearing. Two threaded platforms slidably connected to the transverse guide rail are threadedly connected to one side of the bidirectional threaded rod. Two groups of transverse optical rods are respectively installed inside the vehicle body through two groups of vertical fixing seats. Two racks are slidably connected to the two groups of transverse optical rods through slide tables, and the two racks are respectively fixed to the two threaded platforms through two connecting plates. A servo motor for driving the bidirectional threaded rod to rotate along the axial direction is provided on one side of the chassis. The tops of the two rotating shafts are respectively provided with gears through key grooves, and the gears are engaged with the racks.

[0008] As a further solution of the present invention, the ejecting assembly includes four groups of vertical optical rods fixed to the inner side of the vehicle body through four groups of vertical fixing seats. Two adjacent groups of vertical optical rods are slidably connected to vertical sliding plates through slide tables. A lifting optical rod is fixedly connected between the two vertical sliding plates. A lifting handle is fixedly connected to one side of the lifting optical rod. Ejecting mounting frames are fixedly connected to one side of two of the vertical sliding plates. Connecting cylinders are fixedly connected to the bottoms of the two gears. Annular grooves are formed in the circumferential outer walls of the connecting cylinders, and snap rings are sleeved in the annular grooves. One side of the snap ring is fixed to the two ejecting mounting frames through two connecting rods respectively.

[0009] As a further solution of the present invention, the photoelectric positioning mechanism includes a groove type photoelectric switch 1 and a groove type photoelectric switch 2 fixedly connected to one side of the chassis. The top of one of the threaded platforms is fixedly connected with an induction frame that cooperates with the groove type photoelectric switch 1 and the groove type photoelectric switch 2. The magnetic positioning mechanism includes two rectangular electromagnet suction cups fixedly connected to the inner side of the vehicle body. One side of each of the two connecting plates is fixedly connected with a positioning mounting frame, and one side of the positioning mounting frame is fixedly connected with an iron plate that cooperates with the rectangular electromagnet suction cup.

[0010] As a further solution of the present invention, the secondary sealing assembly includes a pressing frame 1 and a pressing frame 2 respectively arranged on the outer sides of the two vehicle doors. Two groups of sealing rings are arranged inside the pressing frame 1 and the pressing frame 2, and the two groups of sealing rings are respectively in contact with the vehicle door and the vehicle body. A mutually cooperating pressing groove is opened on the adjacent side of the pressing frame 1 and the pressing frame 2, and a sealing strip is fixedly connected to the top corner position of the pressing groove. Push-pull electromagnets are fixedly connected to the four corners inside the two vehicle doors. One end of the push rod of the push-pull electromagnet passes through the vehicle door and is respectively fixed to the pressing frame 1 and the pressing frame 2. The other end of the push rod of the push-pull electromagnet is fixedly connected with a positioning iron block. Through holes for avoiding the positioning iron block are opened at the four corners inside the two vehicle doors, an installation sleeve is fixedly connected inside the through hole, and a circular electromagnet suction cup that cooperates with the positioning iron block is fixedly connected inside the installation sleeve. A sealing pad is arranged at the position where the push rod of the push-pull electromagnet contacts the vehicle door.

[0011] As a further solution of the present invention, it further includes two groups of destructive components arranged on the inner side of the vehicle body. The destructive component includes an upper destructive mounting seat and a lower destructive mounting seat installed on the inner side of the vehicle body. The rotating shaft is arranged inside the upper destructive mounting seat and the lower destructive mounting seat. A lower limit plate for supporting the bottom end of the rotating shaft is arranged at the bottom of the lower destructive mounting seat. Both the upper destructive mounting seat and the lower destructive mounting seat include an inner fixed seat fixedly connected to the inner side of the vehicle body. Limiting sliding grooves are opened on both sides of the inner fixed seat, and an outer sliding seat is slidably connected between the two limiting sliding grooves. An installation cavity is formed between the inner fixed seat and the outer sliding seat, and an installation bearing for limiting the rotating shaft is arranged inside the installation cavity. The bottom of the outer sliding seat is an open structure for avoiding the installation bearing. Top grooves are opened on both sides of the outer sliding seat. A destructible fixing mechanism is arranged between the inner fixed seat and the outer sliding seat. One side of each of the two vertical sliding plates is fixedly connected with a blanking plate, and two blanking blocks that can contact the top grooves are fixedly connected to the end of the blanking plate. A blanking slope is opened at the top of the blanking block. An auxiliary force mechanism for destroying the destructible fixing mechanism is arranged on the inner side of the vehicle body.

[0012] As a further solution of the present invention, the breakable fixing mechanism includes semi-circular card slots opened on both sides of the inner fixing seat and the outer sliding seat. A pin rod is clamped in the semi-circular card slots on both sides of the inner fixing seat and the outer sliding seat. Cast iron card frames for limiting the position of the pin rod are fixedly connected to both sides of the inner fixing seat and the outer sliding seat. An induced fracture groove is opened on the stress concentration edge of the cast iron card frame, and the induced fracture groove is of a V-shaped structure.

[0013] As a further solution of the present invention, the auxiliary force mechanism includes an upper fixed iron block and a lower fixed iron block fixedly connected to the outer circumference of the lifting optical rod. A sliding cylinder driven by a lifting handle is sleeved on the outer circumference of the lifting optical rod and located between the upper fixed iron block and the lower fixed iron block. An impact iron block that can contact and collide with the upper fixed iron block is fixedly connected to the top end of the sliding cylinder, and a magnetic ring that can generate magnetic attraction with the lower fixed iron block is fixedly connected to the bottom end of the sliding cylinder.

[0014] An installation method for a passenger door of a bus includes the following steps: S1: During installation, first install the chassis, rectangular electromagnet suction cup and multiple groups of horizontal optical rods inside the vehicle body through screws. Then, successively complete the installation of the connecting plate, threaded platform, positioning mounting frame and rack through screws. At this time, install multiple inner fixing seats inside the vehicle body through screws. Then, insert the rotating shaft into the inner fixing seat through the installation bearing. Then, clamp the outer sliding seat on the inner fixing seat to limit and fix the installation bearing. At this time, clamp the pin rod in the semi-circular card slot and limit and fix it through the cast iron card frame; S2: Then install the vertical optical rod and vertical sliding plate inside the vehicle body respectively. Then, successively install the upper fixed iron block, impact iron block, sliding cylinder, magnetic ring and lower fixed iron block on the lifting optical rod. Then, install the lifting optical rod between the two vertical sliding plates. Thus, the preliminary installation is completed; S3: Then assemble the door. First, install the auxiliary sealing component on the outer side of the door, and paste the sealing strip and sealing ring. Then, fixedly connect the rubber edge on the outer side of the door. Then, install the stainless steel universal ball head on the inner side of the door, and connect it to the swing arm and the connecting arm through the stainless steel universal ball head respectively. The other end of the connecting arm is connected to the inside of the vehicle body through the stainless steel universal ball head. Thus, the installation of the entire door is completed; S4: When the vehicle door is in use, through the cooperation of the induction frame with slot photoelectric switch 1 and slot photoelectric switch 2, the opening and closing position of the vehicle door is determined. Then, by starting the servo motor, the servo motor rotates to drive the bidirectional threaded rod to drive the two threaded platforms to move along the transverse guide rail towards both ends respectively. At this time, the two threaded platforms drive the two racks to move outwards along the transverse optical rod through the two connecting plates respectively. And because the racks are engaged with the gears, the gears rotate to drive the rotating shaft to rotate through the key slots. The rotating shaft rotates to drive the vehicle door to flip outwards through the cooperation of the two swing arms and the two connecting arms. And due to the setting of the two connecting arms, the jitter amount of the vehicle door during the outward swing process is reduced and it is more stable; S5: When the vehicle door is closed, the servo motor is started. The servo motor rotates in reverse to realize the inward flipping and closing of the vehicle door. At this time, by starting the rectangular electromagnet suction cup, the rectangular electromagnet suction cup generates magnetic force and magnetically attracts and fixes the iron plate, so that the vehicle door is locked in the closed position; S6: After the two vehicle doors are closed, at this time, by simultaneously starting the push-pull electromagnets at the four corners of pressing frame 1, the push rods of the push-pull electromagnets move backward to drive pressing frame 1 to move inwards, and the two groups of sealing rings arranged on pressing frame 1 are respectively in contact with the vehicle door and the vehicle body. At this time, start the push-pull electromagnets at the four corners of pressing frame 2, so that the two groups of sealing rings arranged on pressing frame 2 are respectively in contact with the vehicle door and the vehicle body. At this time, by starting the circular electromagnet suction cup to magnetically attract and fix the positioning iron block arranged at the rear end of the push rod of the push-pull electromagnet. At the same time, the pressure grooves opened on the adjacent sides of pressing frame 1 and pressing frame 2 overlap each other, and the top corners are sealed through the sealing strips, thus completing the secondary sealing operation between the two vehicle doors and the vehicle body; S7: When an accident occurs to the passenger car or a power failure occurs, then by quickly pulling up the lifting handle upwards, the lifting handle drives the sliding cylinder to move upwards quickly, and collides with the upper fixed iron block through the impact iron block. At this time, the upper fixed iron block drives the lifting optical rod to move upwards quickly under the dual action of the pulling force and inertia. At this time, the vertical sliding plate drives the blanking block to move upwards. At this time, force is applied to the pin rod through the blanking slope opened at the top end of the blanking block, forcing the pin rod to disengage from the semi-circular card slot and applying force to the cast iron card frame. At this time, the stress concentration side of the cast iron card frame is stressed and breaks from the induced fracture groove, and the pin rod disengages from the semi-circular card slot, thus releasing the fixed state between the inner fixed seat and the outer sliding seat. Then the blanking block continues to move upwards and applies an upward force to the outer sliding seat through the blanking groove, so that the outer sliding seat slides upwards and is quickly separated from the inner fixed seat. At the same time, through the blanking mounting frame and the snap ring, the gear moves upwards and completes the disengagement operation from the rotating shaft and the key slot, thus realizing the violent removal of the outer sliding seat, and releasing the fixed installation state of the rotating shaft, and breaking one of the fixed components of the vehicle door. At this time, the vehicle door can be freely opened within a certain range to facilitate passengers to escape from the carriage.

[0015] Compared with the prior art, the present invention provides a passenger door for a bus and an installation method thereof, having the following beneficial effects: 1. The present invention drives the parallel opening and closing assembly through the driving assembly to realize the parallel opening of two doors. It not only opens and closes stably and evenly, but also does not occupy the vertical space inside or outside the vehicle, forming an almost complete opening. This enables passengers to board and alight without having to avoid the moving path of the door, especially facilitating the rapid passage of passengers carrying luggage, baby carriages or wheelchairs, improving the boarding and alighting efficiency, reducing the risk of congestion, having fewer components, a lower failure rate, being more convenient for inspection and replacement of components during daily maintenance, and having a lower manufacturing cost and later maintenance cost than complex folding doors, making it suitable for high-frequency use.

[0016] 2. The present invention initially seals between the two doors and the vehicle body through a rubber edge, and then realizes the secondary sealing between the two doors and the vehicle body through the secondary sealing assembly, which not only prevents water and dust, but also makes it difficult for the heating or cooling air inside the vehicle body to leak outside.

[0017] 3. The present invention realizes the disengagement operation between the driving assembly and the parallel opening and closing assembly through the ejector assembly, and enables the door to be manually opened, with higher safety.

[0018] 4. The present invention determines the opening and closing positions of the door through the cooperation of the induction frame with the slot type photoelectric switch one and the slot type photoelectric switch two, and generates a magnetic force through the rectangular electromagnet suction cup to magnetically fix the iron plate, so that the door is locked in the closed position. And when there is a power failure during a fault, the magnetic force of the rectangular electromagnet suction cup disappears, so it does not affect the manual opening operation of the door.

[0019] 5. The present invention drives the lifting handle to move upward, driving the lifting optical rod and two vertical sliding plates to move upward along the vertical optical rod, so that the gear is completely disengaged from the rotating shaft and the key groove, thereby realizing the transformation of the door from electric to manual opening, which is applicable to emergency situations such as power outages.

[0020] 6. The present invention uses a push-pull electromagnet to make the two groups of sealing rings provided on the pressing frame one and the pressing frame two contact the door and the vehicle body respectively in sequence. At the same time, the pressure grooves opened on the adjacent sides of the pressing frame one and the pressing frame two overlap each other, and the top corners are sealed through a sealing strip, thereby completing the secondary sealing operation between the two doors and the vehicle body.

[0021] 7. The present invention uses a destructive assembly composed of a cast iron bracket and a pin rod, etc. In an emergency, a force is applied to the pin rod through the ejector slope, forcing the pin rod to disengage from the semi-circular card slot and causing the cast iron bracket to break from the induced fracture groove, thereby releasing the fixed state of the outer sliding seat. The design is ingenious, and it can not only provide installation and clamping during normal use, but also be violently damaged when needed.

[0022] 8. The present invention drives the sliding cylinder to move upward rapidly by pulling the handle, and impacts the iron block against the upper fixed iron block. At this time, the upper fixed iron block drives the lifting optical rod to move upward rapidly under the dual action of pulling force and inertia, thereby realizing the violent removal of the outer sliding seat. The violent disassembly is easier, more suitable for the violent disassembly operation of the weak, and has higher safety.

[0023] 9. Through the combined use of the infrared sensor and the displacement sensor, the present invention can effectively monitor and prevent the door from pinching people. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the outer three-dimensional structure of the first embodiment of a passenger door of a bus proposed by the present invention; Figure 2 It is a schematic diagram of the door structure of the first embodiment of a passenger door of a bus proposed by the present invention; Figure 3 It is the Figure 2 rear side structure schematic diagram of the first embodiment of a passenger door of a bus proposed by the present invention; Figure 4 It is the Figure 3 amplified structure schematic diagram of part A of the first embodiment of a passenger door of a bus proposed by the present invention; Figure 5 It is the Figure 3 partial sectional structure schematic diagram of the first embodiment of a passenger door of a bus proposed by the present invention; Figure 6 It is the Figure 1 inner three-dimensional structure schematic diagram of the first embodiment of a passenger door of a bus proposed by the present invention; Figure 7 It is a schematic diagram of the drive assembly structure of the first embodiment of a passenger door of a bus proposed by the present invention; Figure 8 It is a schematic diagram of the magnetic positioning mechanism structure of the first embodiment of a passenger door of a bus proposed by the present invention; Figure 9 It is a schematic diagram of the ejector assembly structure of the first embodiment of a passenger door of a bus proposed by the present invention; Figure 10 It is the Figure 9 partial exploded structure schematic diagram of the first embodiment of a passenger door of a bus proposed by the present invention; Figure 11 It is the inner three-dimensional structure schematic diagram of the second embodiment of a passenger door of a bus proposed by the present invention; Figure 12 It is a schematic diagram of the destructive component structure of the second embodiment of a passenger door of a bus proposed by the present invention; Figure 13 It is a partial enlarged structure schematic diagram of the destructive component of the second embodiment of a passenger door of a bus proposed by the present invention; Figure 14 Explosion structure schematic diagram of Embodiment 2 of a passenger door for a bus proposed by the present invention Figure 13 ; Figure 15 Cast iron bracket structure schematic diagram of Embodiment 2 of a passenger door for a bus proposed by the present invention Figure 16 Lower limit plate structure schematic diagram of Embodiment 2 of a passenger door for a bus proposed by the present invention Figure 17 Auxiliary force mechanism structure schematic diagram of Embodiment 2 of a passenger door for a bus proposed by the present invention

[0025] In the figure: 1, vehicle body; 2, door; 201, rubber edge 3, secondary sealing assembly; 301, pressing frame one; 302, pressing frame two; 303, pressing groove; 304, sealing strip; 305, sealing ring; 306, positioning iron block; 307, push-pull electromagnet; 308, mounting sleeve; 309, circular electromagnet suction cup 4, drive assembly; 401, servo motor; 402, chassis; 403, bidirectional threaded rod; 404, connecting plate; 405, threaded platform; 406, horizontal guide rail; 407, rack; 408, horizontal optical rod; 409, gear; 410, keyway 5, parallel opening and closing assembly; 501, upper bearing seat; 502, rotating shaft; 503, bearing seat with blind plate; 504, stainless steel universal ball head; 505, swing arm; 506, connecting arm 6, magnetic positioning mechanism; 601, positioning mounting frame; 602, iron plate; 603, rectangular electromagnet suction cup 7, photoelectric positioning mechanism; 701, induction frame; 702, slot type photoelectric switch one; 703, slot type photoelectric switch two 8, ejecting component; 801, vertical optical rod; 802, vertical sliding plate; 803, lifting handle; 804, lifting optical rod; 805, connecting rod; 806, snap ring; 807, connecting cylinder; 808, annular groove; 809, ejecting mounting frame; 810, ejecting block; 811, ejecting slope; 812, ejecting plate 9, destructive component; 901, upper destructive mounting seat; 902, lower destructive mounting seat; 903, inner fixing seat; 904, outer sliding seat; 905, pin rod; 906, top groove; 907, limit sliding groove; 908, semi-circular clamping groove; 909, mounting bearing; 910, cast iron bracket; 911, induced fracture groove; 912, lower limit plate 10, auxiliary force mechanism; 1001, upper fixed iron block; 1002, impact iron block; 1003, sliding cylinder; 1004, magnetic ring; 1005, lower fixed iron block Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The serial numbers assigned to the components in this document itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0028] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature. Embodiment 1

[0029] Refer to Figures 1 - 10, a passenger door for a bus, comprising a vehicle body 1 and two doors 2. Rubber edges 201 are provided around the two doors 2. The two doors 2 are respectively installed in the door frame of the vehicle body 1 through two parallel opening and closing assemblies 5. A plurality of infrared sensors are provided at the top of the vehicle body 1. A plurality of displacement sensors are provided in the rubber edges 201 on the contact edges of the two doors 2. A box body is provided on one side of the vehicle body 1. A single-chip microcomputer controller A and a single-chip microcomputer controller B are provided in the box body. The input end of the single-chip microcomputer controller A is connected to the infrared sensors through wires. The infrared sensor assembly is composed of positioning screws, positioning plates and infrared sensor bodies. Therefore, when a human body is detected approaching by the infrared sensors, the single-chip microcomputer controller A will control the doors 2 to stop the opening and closing actions, thus playing a function of preventing pinching. The input end of the single-chip microcomputer controller B is connected to the displacement sensors through wires. Therefore, when it is detected that the doors 2 pinch a person through the displacement sensors, the single-chip microcomputer controller B will control the doors 2 to stop the opening and closing actions, thus also playing a function of preventing pinching. A driving assembly 4 for driving the parallel opening and closing assembly 5 to move is provided inside the vehicle body 1. A positioning assembly for positioning the opening and closing positions of the two doors 2 is provided inside the vehicle body 1. The positioning assembly includes a magnetic positioning mechanism 6 and an optoelectronic positioning mechanism 7. A top material assembly 8 for quickly separating the driving assembly 4 from the parallel opening and closing assembly 5 is provided inside the vehicle body 1. Secondary sealing assemblies 3 for performing secondary sealing between the doors 2 and the vehicle body 1 are provided on the outer sides of the two doors 2. By driving the parallel opening and closing assembly 5 through the driving assembly 4, the two doors 2 are opened in parallel. Not only is the opening range small, but the width of the opening channel is large, which is beneficial for passengers to enter and exit the channel. Moreover, the opening and closing are stable and uniform in speed, without occupying the vertical space inside or outside the vehicle, forming an almost complete opening. This enables passengers to board and alight without having to avoid the moving path of the doors 2, especially facilitating passengers carrying luggage, baby carriages or in wheelchairs to pass quickly, improving the boarding and alighting efficiency and reducing the congestion risk. In addition, there are fewer components and a lower failure rate. During daily maintenance, it is more convenient to inspect and replace components. Moreover, the manufacturing cost and later maintenance cost are lower than those of complex folding doors, making it suitable for high-frequency use. Due to the use of a mechanical link structure, there is an error when the two doors 2 are closed. Therefore, the initial sealing between the two doors 2 and the vehicle body 1 is achieved through the rubber edges 201, and then the secondary sealing between the two doors 2 and the vehicle body 1 is achieved through the secondary sealing assemblies 3, which not only prevents water and dust, but also prevents the warm air or cold air inside the vehicle body 1 from leaking easily. In case of an accident or a power failure, the doors 2 cannot be opened. Therefore, the separation operation between the driving assembly 4 and the parallel opening and closing assembly 5 can be achieved through the top material assembly 8, and the doors 2 can be manually opened, with higher safety.

[0030] In order to solve the problem of stable opening and closing of two vehicle doors 2, the parallel opening and closing assembly 5 in the present invention includes two groups of upper bearing seats 501 and blind plate bearing seats 503 fixed to the inner side of the vehicle body 1 by bolts. A rotating shaft 502 is provided between the two opposite upper bearing seats 501 and blind plate bearing seats 503. Two swing arms 505 are welded to one side of the rotating shaft 502. One end of each of the two swing arms 505 is rotatably connected to the vehicle door 2 through a stainless steel universal ball head 504. The top and bottom of the two vehicle doors 2 are rotatably connected to a connecting arm 506 through a stainless steel universal ball head 504, and the end of the connecting arm 506 is rotatably connected to the vehicle body 1 through a stainless steel universal ball head 504. By rotating the rotating shaft 502, the rotating shaft 502 drives the vehicle door 2 to flip outwards through the two swing arms 505 and with the cooperation of the two connecting arms 506. And due to the setting of the two connecting arms 506, the shaking amount of the vehicle door 2 during the outward swing process is reduced and it is more stable. The driving assembly 4 includes a chassis 402 fixed to the inner side of the vehicle body 1 by bolts. A transverse guide rail 406 is fixed to the inner wall of one side of the chassis 402 by bolts. A bidirectional threaded rod 403 is rotatably connected to the inside of the chassis 402 through a bearing. Two threaded platforms 405 slidably connected to the transverse guide rail 406 are threadedly connected to one side of the bidirectional threaded rod 403. Two groups of transverse optical rods 408 are respectively installed on the inner side of the vehicle body 1 through two groups of vertical fixing seats. Two racks 407 are slidably connected to the two groups of transverse optical rods 408 through slide tables, and the two racks 407 are respectively fixed to the two threaded platforms 405 through two connecting plates 404. A servo motor 401 for driving the bidirectional threaded rod 403 to rotate along the axial direction is provided on one side of the chassis 402. The top ends of the two rotating shafts 502 are respectively provided with gears 409 clamped through key grooves 410, and the gears 409 are meshed with the racks 407. By starting the servo motor 401, the rotation of the servo motor 401 causes the bidirectional threaded rod 403 to drive the two threaded platforms 405 to move towards both ends along the transverse guide rail 406 respectively. At this time, the two threaded platforms 405 respectively drive the two racks 407 to move outwards along the transverse optical rods 408 through the two connecting plates 404. And because the racks 407 are meshed with the gears 409, the gears 409 rotate and drive the rotating shafts 502 to rotate through the key grooves 410. Not only is the speed uniform, but also the rotation angle of the rotating shafts 502 is adjustable and controllable. The photoelectric positioning mechanism 7 includes a slot type photoelectric switch one 702 and a slot type photoelectric switch two 703 fixed to one side of the chassis 402 by bolts. An induction frame 701 cooperating with the slot type photoelectric switch one 702 and the slot type photoelectric switch two 703 is fixed to the top of one of the threaded platforms 405 by bolts. The magnetic positioning mechanism 6 includes two rectangular electromagnet suction cups 603 fixed to the inner side of the vehicle body 1 by bolts. The model of the rectangular electromagnet suction cup 603 is: MH-P100 / 50 / 40. A positioning mounting frame 601 is fixed to one side of each of the two connecting plates 404 by bolts. An iron plate 602 cooperating with the rectangular electromagnet suction cup 603 is fixed to one side of the positioning mounting frame 601 by bolts.Through the cooperation of the induction frame 701 with the slot photoelectric switch 1 702 and the slot photoelectric switch 2 703, the opening and closing positions of the vehicle door 2 are determined. When the vehicle door 2 is in the closed position, if only relying on the thread self-locking function in the driving component 4, the self-locking performance is poor. Therefore, when the vehicle door 2 is in the closed position, by starting the rectangular electromagnet suction cup 603, the rectangular electromagnet suction cup 603 generates magnetic force and magnetically fixes the iron plate 602, so that the vehicle door 2 is locked in the closed position. And when there is a power failure due to a fault, the magnetic force of the rectangular electromagnet suction cup 603 disappears, so it does not affect the manual opening operation of the vehicle door 2.

[0031] To solve the problem that the vehicle door is often difficult to open easily when encountering an accident or a sudden power failure, the ejector component 8 in the present invention includes four groups of vertical light rods 801 fixed to the inner side of the vehicle body 1 through four groups of vertical fixing seats. Adjacent two groups of vertical light rods 801 are both slidably connected with vertical sliding plates 802 through sliding tables. A lifting light rod 804 is fixed between the two vertical sliding plates 802 by bolts. One side of the lifting light rod 804 is fixed with a lifting handle 803 by bolts. One side of each of the two vertical sliding plates 802 is fixed with an ejector mounting bracket 809 by bolts. The bottom ends of the two gears 409 are both fixed with connecting cylinders 807 by bolts. A ring groove 808 is formed on the circumferential outer wall of the connecting cylinder 807. A snap ring 806 is sleeved in the ring groove 808. One side of the snap ring 806 is fixed to the two ejector mounting brackets 809 respectively through two connecting rods 805. By pulling up the lifting handle 803, the lifting handle 803 drives the lifting light rod 804 and the two vertical sliding plates 802 to move upward along the vertical light rods 801. At this time, the vertical sliding plates 802 drive the gears 409 to move upward along the keyway 410 opened at the end of the rotating shaft 502 through the ejector mounting brackets 809 and the snap ring 806 until the gears 409 are completely disengaged from the rotating shaft 502 and the keyway 410. At this time, the electric drive state of the rotating shaft 502 is released. Therefore, the vehicle door 2 and the parallel opening and closing component 5 can be manually swung, and the manual opening operation of the vehicle door 2 can be completed.

[0032] In order to solve the problem of insufficient sealing of the vehicle door 2, the secondary sealing assembly 3 in the present invention includes a pressing frame one 301 and a pressing frame two 302 respectively arranged on the outer sides of the two vehicle doors 2. Two groups of sealing rings 305 are provided on the inner sides of the pressing frame one 301 and the pressing frame two 302. The two groups of sealing rings 305 are respectively in contact with the vehicle door 2 and the vehicle body 1. Grooves 303 that cooperate with each other are formed on the adjacent sides of the pressing frame one 301 and the pressing frame two 302. Sealing strips 304 are bonded at the corner positions of the grooves 303. Push-pull electromagnets 307 are fixed at the four corners inside the two vehicle doors 2 through bolts. The model of the push-pull electromagnet 307 is: JX1264B-34. One end of the push rod of the push-pull electromagnet 307 passes through the vehicle door 2 and is fixed to the pressing frame one 301 and the pressing frame two 302 respectively. The other end of the push rod of the push-pull electromagnet 307 is fixed with a positioning iron block 306 through bolts. Through holes for avoiding the positioning iron block 306 are formed at the four corners inside the two vehicle doors 2. Installation sleeves 308 are welded in the through holes. Circular electromagnet suction cups 309 that cooperate with the positioning iron block 306 are fixed in the installation sleeves 308 through bolts. The model of the circular electromagnet suction cup 309 is: MH-P40 / 20. A sealing pad is provided at the contact position between the push rod of the push-pull electromagnet 307 and the vehicle door 2. After the two vehicle doors 2 are closed, at this time, by simultaneously starting the push-pull electromagnets 307 at the four corners of the pressing frame one 301, the push rods of the push-pull electromagnets 307 move backward to drive the pressing frame one 301 to move inward, and the two groups of sealing rings 305 provided on the pressing frame one 301 are respectively in contact with the vehicle door 2 and the vehicle body 1. At this time, then start the push-pull electromagnets 307 at the four corners of the pressing frame two 302, so that the two groups of sealing rings 305 provided on the pressing frame two 302 are respectively in contact with the vehicle door 2 and the vehicle body 1. At this time, by starting the circular electromagnet suction cup 309, the positioning iron block 306 provided at the rear end of the push rod of the push-pull electromagnet 307 is magnetically fixed, avoiding damage to the push-pull electromagnet 307 due to long-term power-on, thereby fixing the position of the pressing frame two 302. At the same time, the grooves 303 formed on the adjacent sides of the pressing frame one 301 and the pressing frame two 302 overlap each other, and the corners are sealed through the sealing strips 304, thereby completing the secondary sealing operation between the two vehicle doors 2 and the vehicle body 1. Embodiment 2

[0033] When an accident occurs or a power failure occurs in the passenger car, the vehicle door 2 cannot be opened. Therefore, the top material assembly 8 can be used to realize the disengagement operation of the driving assembly 4 and the parallel opening and closing assembly 5, and the vehicle door 2 can be manually opened. This situation is based on the fact that the vehicle door 2 and the parallel opening and closing assembly 5 are in good condition. However, if the vehicle door 2 is deformed or the parallel opening and closing assembly 5 is slightly deformed during an accident, it will be difficult to manually swing the rotating shaft 502 and the vehicle door 2, or even impossible to open. Therefore, it is necessary to further design to be able to open the vehicle door 2 even when the vehicle door 2 or the parallel opening and closing assembly 5 is slightly deformed.

[0034] To solve the above problems: Refer to Figures 11 - 17Two groups of destructible components 9 are provided on the inner side of the vehicle body 1. The destructible component 9 includes an upper destructible mounting seat 901 and a lower destructible mounting seat 902 installed on the inner side of the vehicle body 1. The rotating shaft 502 is arranged inside the upper destructible mounting seat 901 and the lower destructible mounting seat 902. The bottom of the lower destructible mounting seat 902 is provided with a lower limiting plate 912 for supporting the bottom end of the rotating shaft 502. The upper destructible mounting seat 901 and the lower destructible mounting seat 902 both include an inner fixing seat 903 fixed to the inner side of the vehicle body 1 by bolts. Limiting slide grooves 907 are provided on both sides of the inner fixing seat 903. An outer slide seat 904 is slidably connected between the two limiting slide grooves 907. An installation cavity is formed between the inner fixing seat 903 and the outer slide seat 904. A rotating shaft 502 is provided in the installation cavity. The shaft 502 is limited by an installation bearing 909, and the bottom of the outer slide seat 904 is an open structure for avoiding the installation bearing 909. Top grooves 906 are provided on both sides of the outer slide seat 904. A destructible fixing mechanism is provided between the inner fixed seat 903 and the outer slide seat 904. One side of the two vertical slide plates 802 is fixed with a top material plate 812 by bolts, and the end of the top material plate 812 is fixed with two top material blocks 810 that can contact the top groove 906 by bolts. The top of the top material block 810 is provided with a top material slope 811. The inner side of the vehicle body 1 is provided with an auxiliary mechanism 10 for destroying the destructible fixing mechanism. The destructible fixing mechanism includes semicircular grooves 908 provided on both sides of the inner fixed seat 903 and the outer slide seat 904. The inner fixed seat 90 3 and the semicircular slots 908 on both sides of the outer sliding seat 904 are provided with pin rods 905, and cast iron brackets 910 for limiting the position of the pin rods 905 are fixed by bolts on both sides of the inner fixed seat 903 and the outer sliding seat 904, and the stress concentration side of the cast iron bracket 910 is provided with an induced fracture groove 911, and the induced fracture groove 911 is a V-shaped structure. Since the cast iron used in the cast iron bracket 910 is a type of metal with higher brittleness, a larger external force is required for fracture, which is suitable for scenes that require a certain bearing capacity but fracture when overloaded, and the induced fracture groove 911 with a V-shaped structure is provided on the stress concentration side of the cast iron bracket 910, so that it can not only provide installation engagement during normal use, but also carry out violent destruction when necessary. Therefore, in an emergency, the cast iron bracket 910 can be easily broken. The vertical slide 802 drives the ejection block 810 to move upward. At this time, the ejection slope 811 opened at the top of the ejection block 810 applies force to the pin 905, forcing the pin 905 to disengage from the semicircular groove 908 and apply force to the cast iron bracket 910. At this time, the stress concentration edge of the cast iron bracket 910 is stressed and fractured from the induced fracture groove 911, and the pin 905 is disengaged from the semicircular groove 908, thereby releasing the fixed state between the inner fixed seat 903 and the outer slide seat 904. Then the ejection block 810 continues to move upward and applies an upward force to the outer slide seat 904 through the ejection groove 906, so that the outer slide seat 904 slides upward and quickly disengages from the inner fixed seat 903. At the same time, through the ejection mounting frame 809 and the retaining ring 806,Move the gear 409 upward and complete the disengagement operation from the rotating shaft 502 and the keyway 410, thereby releasing the fixed installation state of the rotating shaft 502 and breaking one of the fixing components of the car door 2. At this time, the car door 2 can be freely opened within a certain range to facilitate passengers to escape from the carriage.

[0035] For the convenience of rapid and violent demolition, the auxiliary force mechanism 10 in the present invention includes an upper fixed iron block 1001 and a lower fixed iron block 1005 that are fixed to the outer circumference of the lifting smooth rod 804 by bolts. A sliding cylinder 1003 driven by pulling the lifting handle 803 is sleeved on the outer circumference of the lifting smooth rod 804 and located between the upper fixed iron block 1001 and the lower fixed iron block 1005. An impact iron block 1002 that can contact and collide with the upper fixed iron block 1001 is fixed to the top end of the sliding cylinder 1003 by bolts. A magnetic ring 1004 that can generate magnetic attraction with the lower fixed iron block 1005 is fixed to the bottom end of the sliding cylinder 1003 by bolts. By quickly pulling the lifting handle 803 upward, the lifting handle 803 drives the sliding cylinder 1003 to quickly move upward, and the impact iron block 1002 collides with the upper fixed iron block 1001. At this time, the upper fixed iron block 1001 drives the lifting smooth rod 804 to quickly move upward under the dual action of the pulling force and inertia, thereby realizing the violent demolition of the outer sliding seat 904.

[0036] An installation method for a passenger door of a bus, comprising the following steps: S1: During installation, first install the chassis 402, the rectangular electromagnet suction cup 603, and multiple groups of horizontal smooth rods 408 on the inner side of the vehicle body 1 through screws. Then, successively complete the installation of the connecting plate 404 with the threaded platform 405, the positioning mounting bracket 601, and the rack 407 through screws. At this time, install multiple inner fixing seats 903 on the inner side of the vehicle body 1 through screws. Then, the rotating shaft 502 is clamped inside the inner fixing seat 903 through the installation bearing 909. Then, the outer sliding seat 904 is clamped on the inner fixing seat 903 to limit and fix the installation bearing 909. At this time, the pin rod 905 is clamped in the semi-circular card slot 908 and limited and fixed by the cast iron card rack 910; S2: Then install the vertical smooth rod 801 and the vertical sliding plate 802 on the inner side of the vehicle body 1 respectively. Then, install the upper fixed iron block 1001, the impact iron block 1002, the sliding cylinder 1003, the magnetic ring 1004, and the lower fixed iron block 1005 on the lifting smooth rod 804 in sequence. Then, install the lifting smooth rod 804 between the two vertical sliding plates 802. Thus, the preliminary installation is completed; S3: Then assemble the vehicle door 2. First, install the secondary sealing assembly 3 on the outer side of the vehicle door 2, paste the sealing strip 304 and the sealing ring 305, then bond the rubber edge 201 on the outer side of the vehicle door 2, then install the stainless steel universal ball head 504 on the inner side of the vehicle door 2, and connect it to the swing arm 505 and the connecting arm 506 respectively through the stainless steel universal ball head 504. The other end of the connecting arm 506 is connected to the inner side of the vehicle body 1 through the stainless steel universal ball head 504, thus completing the installation of the entire vehicle door 2; S4: When the vehicle door 2 is in use, through the cooperation of the induction frame 701 with the groove type photoelectric switch one 702 and the groove type photoelectric switch two 703, the opening and closing position of the vehicle door 2 is determined. Then, start the servo motor 401. The rotation of the servo motor 401 causes the bidirectional threaded rod 403 to drive the two threaded platforms 405 to move along the transverse guide rail 406 towards both ends respectively. At this time, the two threaded platforms 405 drive the two racks 407 to move outwards along the transverse optical rod 408 through the two connecting plates 404 respectively. And because the rack 407 meshes with the gear 409, the gear 409 rotates and drives the rotating shaft 502 to rotate through the keyway 410. The rotation of the rotating shaft 502 drives the vehicle door 2 to flip outwards through the two swing arms 505 and with the cooperation of the two connecting arms 506. And due to the setting of the two connecting arms 506, the jitter amount of the vehicle door 2 during the outward swing process is reduced and it is more stable; S5: When the vehicle door 2 is closed, start the servo motor 401. The servo motor 401 rotates in reverse, then the vehicle door 2 is closed by flipping inwards. At this time, start the rectangular electromagnet suction cup 603. The rectangular electromagnet suction cup 603 generates magnetic force and magnetically fixes the iron plate 602, so that the vehicle door 2 is locked in the closed position; S6: After the two vehicle doors 2 are closed, at this time, start the push-pull electromagnets 307 at the four corners of the pressing frame one 301 simultaneously. The push rods of the push-pull electromagnets 307 move backward to drive the pressing frame one 301 to move inwards, and the two groups of sealing rings 305 arranged on the pressing frame one 301 are respectively in contact with the vehicle door 2 and the vehicle body 1. At this time, start the push-pull electromagnets 307 at the four corners of the pressing frame two 302, so that the two groups of sealing rings 305 arranged on the pressing frame two 302 are respectively in contact with the vehicle door 2 and the vehicle body 1. At this time, start the circular electromagnet suction cup 309 to magnetically fix the positioning iron block 306 arranged at the rear end of the push rod of the push-pull electromagnet 307, so that the position of the pressing frame two 302 is fixed. At the same time, the pressure grooves 303 opened on the adjacent sides of the pressing frame one 301 and the pressing frame two 302 overlap each other, and the top corners are sealed through the sealing strip 304, thus completing the secondary sealing operation between the two vehicle doors 2 and the vehicle body 1; S7: When an accident occurs to the passenger bus or a power outage failure occurs, the lifting handle 803 is quickly pulled upward. The lifting handle 803 drives the sliding cylinder 1003 to quickly move upward, and impacts the iron block 1002 against the upper fixed iron block 1001. At this time, the upper fixed iron block 1001 drives the lifting optical rod 804 to quickly move upward under the dual action of the pulling force and inertia. At this time, the vertical sliding plate 802 drives the blanking block 810 to move upward. At this time, a force is applied to the pin rod 905 through the blanking slope 811 opened at the top of the blanking block 810, forcing the pin rod 905 to disengage from the semi-circular card slot 908 and applying a force to the cast iron bracket 910. At this time, the stress concentration edge of the cast iron bracket 910 is stressed and breaks from the induced fracture groove 911, and the pin rod 905 disengages from the semi-circular card slot 908, thus releasing the fixed state between the inner fixed seat 903 and the outer sliding seat 904. Then, the blanking block 810 continues to move upward and applies an upward force to the outer sliding seat 904 through the blanking groove 906, so that the outer sliding seat 904 slides upward and quickly disengages from the inner fixed seat 903. At the same time, through the blanking mounting frame 809 and the snap ring 806, the gear 409 is moved upward and the disengagement operation from the rotating shaft 502 and the keyway 410 is completed, thus realizing the violent removal of the outer sliding seat 904, releasing the fixed installation state of the rotating shaft 502, and breaking one of the fixing components of the car door 2. At this time, the car door 2 can be freely opened within a certain range to facilitate passengers to escape from the carriage.

[0037] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0038] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A passenger door for a bus, comprising a vehicle body (1) and two vehicle doors (2). Rubber edges (201) are provided around the two vehicle doors (2). It is characterized in that, The two doors (2) are respectively installed in the door frame of the vehicle body (1) through two parallel opening and closing assemblies (5). A driving assembly (4) for driving the parallel opening and closing assembly (5) to move is provided on the inner side of the vehicle body (1). A positioning assembly for positioning the opening and closing positions of the two doors (2) is provided on the inner side of the vehicle body (1). The positioning assembly includes a magnetic positioning mechanism (6) and an optoelectronic positioning mechanism (7). A top material assembly (8) for quickly disengaging the driving assembly (4) from the parallel opening and closing assembly (5) is provided on the inner side of the vehicle body (1). Secondary sealing assemblies (3) for secondary sealing between the doors (2) and the vehicle body (1) are provided on the outer sides of the two doors (2). The parallel opening and closing assembly (5) includes two groups of upper bearing seats (501) and blind plate bearing seats (503) fixedly connected to the inner side of the vehicle body (1). A rotating shaft (502) is provided between two opposite upper bearing seats (501) and blind plate bearing seats (503). One side of the rotating shaft (502) is fixedly connected with two swing arms (505). One ends of the two swing arms (505) are respectively rotatably connected to the door (2) through stainless steel universal ball heads (504). The tops and bottoms of the two doors (2) are respectively rotatably connected with connecting arms (506) through stainless steel universal ball heads (504). The ends of the connecting arms (506) are rotatably connected to the vehicle body (1) through stainless steel universal ball heads (504).

2. The passenger door of a bus according to claim 1, characterized in that, The driving assembly (4) includes a chassis (402) fixedly connected to the inner side of the vehicle body (1). A transverse guide rail (406) is fixedly connected to the inner wall of one side of the chassis (402). A bidirectional threaded rod (403) is rotatably connected to the inside of the chassis (402) through a bearing. Two threaded platforms (405) slidably connected to the transverse guide rail (406) are threadedly connected to one side of the bidirectional threaded rod (403). Two groups of transverse optical rods (408) are respectively installed on the inner side of the vehicle body (1) through two groups of vertical fixing seats. Two racks (407) are slidably connected to the two groups of transverse optical rods (408) through sliding platforms. The two racks (407) are respectively fixed to the two threaded platforms (405) through two connecting plates (404). A servo motor (401) for driving the bidirectional threaded rod (403) to rotate along the axial direction is provided on one side of the chassis (402). The tops of the two rotating shafts (502) are respectively provided with gears (409) clamped through key grooves (410), and the gears (409) are engaged with the racks (407).

3. The passenger door of a bus according to claim 2, characterized in that, The ejector assembly (8) includes four groups of vertical light rods (801) fixed to the inner side of the vehicle body (1) through four groups of vertical fixing seats. Adjacent two groups of vertical light rods (801) are both slidably connected with a vertical slide plate (802) through a slide table. A lifting light rod (804) is fixedly connected between the two vertical slide plates (802). One side of the lifting light rod (804) is fixedly connected with a lifting handle (803). One side of each of the two vertical slide plates (802) is fixedly connected with an ejector mounting frame (809). The bottom ends of the two gears (409) are both fixedly connected with a connecting cylinder (807). A ring groove (808) is formed on the circumferential outer wall of the connecting cylinder (807). A snap ring (806) is sleeved in the ring groove (808). One side of the snap ring (806) is fixed to the two ejector mounting frames (809) respectively through two connecting rods (805).

4. The passenger door of a bus according to claim 2, characterized in that, The photoelectric positioning mechanism (7) includes a groove type photoelectric switch one (702) and a groove type photoelectric switch two (703) fixedly connected to one side of the chassis (402). The top of one of the threaded platforms (405) is fixedly connected with an induction frame (701) that cooperates with the groove type photoelectric switch one (702) and the groove type photoelectric switch two (703). The magnetic positioning mechanism (6) includes two rectangular electromagnet suction cups (603) fixedly connected to the inner side of the vehicle body (1). One side of each of the two connecting plates (404) is fixedly connected with a positioning mounting frame (601). One side of the positioning mounting frame (601) is fixedly connected with an iron plate (602) that cooperates with the rectangular electromagnet suction cup (603).

5. The passenger door of a bus according to claim 1, characterized in that, The secondary sealing assembly (3) includes a pressing frame one (301) and a pressing frame two (302) respectively arranged on the outer sides of the two vehicle doors (2). Two groups of sealing rings (305) are arranged on the inner sides of the pressing frame one (301) and the pressing frame two (302). The two groups of sealing rings (305) are in contact with the vehicle door (2) and the vehicle body (1) respectively. The adjacent sides of the pressing frame one (301) and the pressing frame two (302) are both provided with mutually cooperating pressing grooves (303). A sealing strip (304) is fixedly connected to the top corner position of the pressing groove (303). Push-pull electromagnets (307) are fixedly connected to the four corners inside the two vehicle doors (2). One end of the push rod of the push-pull electromagnet (307) passes through the vehicle door (2) and is fixed to the pressing frame one (301) and the pressing frame two (302) respectively. The other end of the push rod of the push-pull electromagnet (307) is fixedly connected with a positioning iron block (306). Through holes for avoiding the positioning iron block (306) are formed at the four corners inside the two vehicle doors (2). An installation sleeve (308) is fixedly connected inside the through hole. A circular electromagnet suction cup (309) that cooperates with the positioning iron block (306) is fixedly connected inside the installation sleeve (308). A sealing pad is arranged at the contact position between the push rod of the push-pull electromagnet (307) and the vehicle door (2).

6. The passenger door of a bus according to claim 3, characterized in that, It further includes two sets of destructive components (9) provided inside the vehicle body (1). The destructive components (9) include an upper destructive mounting base (901) and a lower destructive mounting base (902) mounted inside the vehicle body (1). The rotating shaft (502) is arranged inside the upper destructive mounting base (901) and the lower destructive mounting base (902). A lower limit plate (912) for supporting the bottom end of the rotating shaft (502) is provided at the bottom of the lower destructive mounting base (902). Both the upper destructive mounting base (901) and the lower destructive mounting base (902) include an inner fixed seat (903) fixedly connected to the inside of the vehicle body (1). Limiting sliding grooves (907) are formed on both sides of the inner fixed seat (903). An outer sliding seat (904) is slidably connected between the two limiting sliding grooves (907). An installation cavity is formed between the inner fixed seat (903) and the outer sliding seat (904). An installation bearing (909) for limiting the rotating shaft (502) is arranged in the installation cavity. The bottom of the outer sliding seat (904) is an opening structure for avoiding the installation bearing (909). Top grooves (906) are formed on both sides of the outer sliding seat (904). A destructible fixing mechanism is arranged between the inner fixed seat (903) and the outer sliding seat (904). One side of each of the two vertical sliding plates (802) is fixedly connected with a blanking plate (812). Two blanking blocks (810) that can contact the top grooves (906) are fixedly connected to the end of the blanking plate (812). A blanking slope (811) is formed at the top of the blanking block (810). An auxiliary force mechanism (10) for destroying the destructible fixing mechanism is arranged inside the vehicle body (1).

7. The passenger door of a bus according to claim 6, characterized in that, The destructible fixing mechanism includes semi-circular clamping grooves (908) formed on both sides of the inner fixed seat (903) and the outer sliding seat (904). A pin rod (905) is clamped in the semi-circular clamping grooves (908) on both sides of the inner fixed seat (903) and the outer sliding seat (904). Cast iron clamping frames (910) for limiting the position of the pin rod (905) are fixedly connected to both sides of the inner fixed seat (903) and the outer sliding seat (904). An induced fracture groove (911) is formed on the stress concentration edge of the cast iron clamping frame (910). The induced fracture groove (911) is of a V-shaped structure.

8. The passenger door of a bus according to claim 6, characterized in that, The auxiliary force mechanism (10) includes an upper fixed iron block (1001) and a lower fixed iron block (1005) fixedly connected to the outer circumference of the lifting smooth rod (804). A sliding cylinder (1003) driven by pulling a pulling handle (803) is sleeved on the outer circumference of the lifting smooth rod (804) and located between the upper fixed iron block (1001) and the lower fixed iron block (1005). An impact iron block (1002) that can contact and collide with the upper fixed iron block (1001) is fixedly connected to the top end of the sliding cylinder (1003). A magnetic ring (1004) that can generate magnetic attraction with the lower fixed iron block (1005) is fixedly connected to the bottom end of the sliding cylinder (1003).

9. An installation method for a passenger door of a passenger car, applicable to a passenger door of a passenger car as described in any one of claims 1-8, characterized in that, It includes the following steps: S1: During installation, firstly, the base frame (402), the rectangular electromagnet suction cup (603) and the plurality of transverse light rods (408) are installed on the inner side of the vehicle body (1) by screws, and then the connection plate (404) and the threaded platform (405), the positioning mounting frame (601) and the rack (407) are installed one by one by screws. At this time, the plurality of inner fixing seats (903) are installed on the inner side of the vehicle body (1) by screws, and then the rotating shaft (502) is clamped inside the inner fixing seat (903) by the mounting bearing (909), and then the outer sliding seat (904) is clamped on the inner fixing seat (903) and the mounting bearing (909) is fixed by limiting position, and then the pin rod (905) is clamped in the semicircular clamping groove (908) and fixed by the cast iron clamping frame (910); S2: Then, a vertical polished rod (801) and a vertical slide plate (802) are respectively installed on the inner side of the vehicle body (1), and then, an upper fixed iron block (1001), an impact iron block (1002), a slide cylinder (1003), a magnetic ring (1004) and a lower fixed iron block (1005) are sequentially installed on the lifting polished rod (804), and then the lifting polished rod (804) is installed between the two vertical slide plates (802), and the preliminary installation is completed; S3: Then, the vehicle door (2) is assembled. First, the secondary sealing assembly (3) is installed on the outside of the vehicle door (2), and the sealing strip (304) and the sealing ring (305) are glued. Then, the rubber edge (201) is glued on the outside of the vehicle door (2). Then, the stainless steel universal ball head (504) is installed on the inside of the vehicle door (2), and the stainless steel universal ball head (504) is respectively connected to the swing arm (505) and the connecting arm (506). The other end of the connecting arm (506) is connected to the inside of the vehicle body (1) through the stainless steel universal ball head (504). At this point, the entire installation of the vehicle door (2) is completed. S4: When the door (2) is in use, the opening and closing position of the door (2) is determined by the cooperation between the induction frame (701) and the slot-type photoelectric switch 1 (702) and the slot-type photoelectric switch 2 (703). Then, by starting the servo motor (401), the servo motor (401) rotates to cause the bidirectional threaded rod (403) to drive the two threaded platforms (405) to move along the transverse guide rail (406) to the two ends respectively. At this time, the two threaded platforms (405) drive the two threaded platforms (405) to move to the two ends respectively through the two connecting plates (404). The rack (407) moves outward along the transverse polished rod (408), and because the rack (407) is meshed with the gear (409), the gear (409) rotates to drive the rotating shaft (502) to rotate through the keyway (410), and the rotating shaft (502) rotates through the two swing arms (505) and with the cooperation of the two connecting arms (506), drives the vehicle door (2) to flip outward, and due to the arrangement of the two connecting arms (506), the shaking amount of the vehicle door (2) during the outward swinging process is reduced and the vehicle door (2) is more stable; S5: When the vehicle door (2) is closed, the servo motor (401) is activated. The servo motor (401) rotates in reverse, achieving the inward flipping and closing of the vehicle door (2). At this time, by activating the rectangular electromagnet suction cup (603), the rectangular electromagnet suction cup (603) generates magnetic force and magnetically fixes the iron plate (602), thereby locking the vehicle door (2) in the closed position; S6: After the two vehicle doors (2) are closed, at this time, by simultaneously activating the push-pull electromagnets (307) at the four corners of the first pressing frame (301), the push rods of the push-pull electromagnets (307) move backward, driving the first pressing frame (301) to move inward, and making the two groups of sealing rings (305) provided on the first pressing frame (301) contact the vehicle door (2) and the vehicle body (1) respectively. At this time, then activate the push-pull electromagnets (307) at the four corners of the second pressing frame (302), so that the two groups of sealing rings (305) provided on the second pressing frame (302) contact the vehicle door (2) and the vehicle body (1) respectively. At this time, by activating the circular electromagnet suction cup (309), the positioning iron block (306) provided at the rear end of the push rod of the push-pull electromagnet (307) is magnetically fixed. At the same time, the pressure grooves (303) opened on the adjacent sides of the first pressing frame (301) and the second pressing frame (302) overlap each other, and the top corners are sealed through the sealing strip (304), thereby completing the secondary sealing operation between the two vehicle doors (2) and the vehicle body (1); S7: In case of an accident or a power failure of the passenger car, by quickly pulling up the lifting handle (803), the lifting handle (803) drives the sliding cylinder (1003) to move quickly upward, and impacts the iron block (1002) against the upper fixed iron block (1001). At this time, the upper fixed iron block (1001) drives the lifting optical rod (804) to move quickly upward under the dual action of the pulling force and inertia. At this time, the vertical sliding plate (802) drives the blanking block (810) to move upward. At this time, a force is applied to the pin rod (905) through the blanking slope (811) opened at the top end of the blanking block (810), forcing the pin rod (905) to disengage from the semi-circular clamping groove (908) and applying a force to the cast iron bracket (910). At this time, the stress concentration edge of the cast iron bracket (910) is stressed and fractures from the induced fracture groove (911), and the pin rod (905) disengages from the semi-circular clamping groove (908), thus releasing the fixed state between the inner fixed seat (903) and the outer sliding seat (904). Then the blanking block (810) continues to move upward and applies an upward force to the outer sliding seat (904) through the blanking groove (906), so that the outer sliding seat (904) slides upward and quickly disengages from the inner fixed seat (903). At the same time, through the blanking mounting frame (809) and the snap ring (806), the gear (409) moves upward and completes the disengagement operation from the rotating shaft (502) and the keyway (410), thus realizing the violent removal of the outer sliding seat (904), releasing the fixed installation state of the rotating shaft (502), and breaking one of the fixing components of the car door (2). At this time, the car door (2) can be freely opened within a certain range to facilitate passengers to escape from the carriage.

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