Rail vehicle front end opening and closing mechanism

Abstract

The present invention provides a front-end opening and closing mechanism for a rail vehicle. A movable hood has an annular hood body, a first side hatch and a second side hatch, which are arranged at the first side opening end of the movable hood and can close the first side opening; the first side hatch is connected to the first side hatch driving mechanism, and the second side hatch is connected to the two-side hatch driving mechanism, and both the first side hatch and the second side hatch can be driven to rotate around the base and open or close relative to the movable hood; the movable hood is installed on the base through a movable hood mounting mechanism, and the movable hood mounting mechanism includes a mounting seat and a support seat, the mounting seat is installed on the base, and the movable hood is installed on the support seat; a sliding matching structure is provided between the mounting seat and the support seat, so that the movable hood can generate movement toward or away from the hatch. Designing the movable hood as a structure that can move relative to the vehicle body can effectively reduce the size of the hatch and solve the problem of difficulty in verifying the hatch trajectory of the front-end opening and closing mechanism in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transportation, in particular to a front-end opening and closing mechanism for a rail vehicle. Background Art

[0002] The front-end opening and closing mechanism of the train is located at the front end of the train, and mainly includes load-bearing structure, movement mechanism, hatch and other components. When the front-end opening and closing mechanism is in the closed state, it forms the complete aerodynamic shape of the train, protecting the internal coupler, anti-climber and other front-end components; when the front-end opening and closing mechanism is in the open state, the coupler is exposed to meet the train coupling and operation requirements.

[0003] The hatch of a conventional front-end opening and closing mechanism can be opened and closed by translation or rotation under the drive of the motion mechanism. When the hatch is fully opened, it must meet the space requirements for coupler coupling and train crossing curves. Therefore, the size and movement trajectory of the hatch need to be determined by comprehensively considering the coupler parameters and coupling operation parameters. During the operation of the hatch, it is necessary to avoid interference with components such as anti-climbers. Figure 1 , the hatch door is too large, and after the hatch door is fully opened, it collides with the anti-climbing device 16 at the rear end, affecting the normal opening of the hatch door. Therefore, when the hatch door is large and the anti-climbing device position is not ideal, the motion trajectory verification of the hatch door just becomes extremely difficult. Summary of the Invention

[0004] The purpose of the present invention is to solve one of the above-mentioned technical problems and propose a front-end opening and closing mechanism for rail vehicles with high spatial adaptability to solve the problem of difficulty in verifying the door trajectory of the front-end opening and closing mechanism in the prior art, thereby improving the design compatibility of the front-end opening and closing mechanism of the train.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A rail vehicle front end opening and closing mechanism, comprising:

[0007] base;

[0008] The movable cover has an annular cover body, forming a first side opening and a second side opening that are oppositely arranged, wherein the first side opening is located on a side away from the vehicle body;

[0009] Doors: including a first side door and a second side door, which are arranged at the first side opening end of the movable cover; the first side door is rotatably mounted on the base via a first side connecting arm, and the second side door is rotatably mounted on the base via a second side connecting arm;

[0010] The movable cover mounting mechanism includes a mounting base and a support base. The mounting base is mounted on the base, and the movable cover is mounted on the support base. A sliding fit structure is provided between the mounting base and the support base, so that the movable cover can move toward or away from the cabin door.

[0011] The dimensions of the movable cover and the hatch are configured such that when the first side hatch and the second side hatch are relatively closed, the first side opening can be closed; and when the first side hatch and the second side hatch are relatively opened, the first side hatch and the second side hatch can pass through the annular cover body of the movable cover.

[0012] In some embodiments of the present invention, the sliding fit structure includes:

[0013] Slide rail: set on the end surface of the mounting seat;

[0014] Slider: installed on the end surface of the support seat;

[0015] The sliding block is mounted on the sliding rail and can generate relative motion.

[0016] In some embodiments of the present invention, the slide rail includes a first side slide rail and a second side slide rail that are spaced apart, and the slider includes a first side slider and a second side slider that are detection-set, the first side slider is installed in cooperation with the first side slide rail, and the second side slider is installed in cooperation with the second side slide rail.

[0017] In some embodiments of the present invention, the mounting seat is further provided with a first movement limiting structure, which is located on the path of the slider moving toward the cabin door and can contact the slider after the slider moves into position to limit the movement of the slider.

[0018] In some embodiments of the present invention, a second movable limiting structure is provided on the support seat or the mounting seat. The second movable limiting structure is arranged on the path of the movable cover moving away from the cabin door, and is used to limit the movement of the support seat away from the cabin door.

[0019] In some embodiments of the present invention, the mounting base includes a side plate and a bottom plate, the side plate is arranged in a direction perpendicular to the ground, the bottom plate is arranged in a direction parallel to the ground, the bottom plate is located in the middle section of the side plate surface, and the bottom plate has a plate surface located above and below the side plate; the sliding fitting structure is arranged on the bottom plate;

[0020] The second movable limiting structure includes a limiting stud installed on the support seat, and the limiting stud includes a protruding section arranged in the direction of the side panel surface; when the support seat moves toward the mounting seat, the protruding section can contact the side panel surface located below the bottom plate.

[0021] Some embodiments of the present invention further include a movable cover driving mechanism, wherein a power output end of the movable cover is connected to the support base to drive the support base to move toward or away from the cabin door along the sliding fitting structure.

[0022] In some embodiments of the present invention, the mounting base includes side panels and a bottom panel, wherein the side panels are arranged in a direction perpendicular to the ground, and the bottom panel is arranged in a direction parallel to the ground;

[0023] The movable cover driving mechanism is a pneumatic cylinder or an electric cylinder, and both the pneumatic cylinder and the electric cylinder include a cylinder body and a telescopic rod; a rod hole is provided on the side plate, and the telescopic rod passes through the rod hole on the side plate where the cylinder body is installed and is connected to the support seat.

[0024] In some embodiments of the present invention, the movable cover mounting mechanism is mounted on the upper end surface of the base, and the opening and closing mechanism further comprises:

[0025] Lower support arm: connected to the movable cover;

[0026] Lower guide rail: set on the lower end surface of the base and arranged along the movement direction of the movable cover;

[0027] The lower support arm is provided with a support arm slider, and the support arm slider is arranged in the lower guide rail.

[0028] In some embodiments of the present invention, the lower support arm includes a first support arm and a second support arm symmetrically arranged on both sides of the movable cover, and the lower guide rail includes a first side guide rail and a second side guide rail symmetrically arranged on the base; the slider on the first support arm is arranged in the first side guide rail, and the slider on the second support arm is arranged in the second side guide rail.

[0029] In some embodiments of the present invention, a door driving mechanism is further included: including a first side driving mechanism connected to the first side connecting arm, and a second side driving mechanism connected to the second side connecting arm. The first side driving mechanism and the second side driving mechanism can respectively drive the first side door and the second side door to move.

[0030] Compared with the prior art, the opening and closing mechanism provided by the present invention has the following advantages:

[0031] 1. Building on the existing opening and closing mechanism, a movable cover has been added, designed to move relative to the vehicle body. When the hatch is closed, the cover complements the hatch size, reducing the overall size constraints imposed by the opening and closing mechanism. During the hatch opening and closing process, the cover's forward and backward movement ensures normal hatch opening and closing.

[0032] 2. After adding the movable cover, the size of the hatch can be effectively reduced, which can solve the problem of difficulty in verifying the hatch trajectory of the front-end opening and closing mechanism in the existing technology, avoid motion interference with structures such as the anti-climber during the hatch opening process, and improve the design compatibility of the front-end opening and closing mechanism of the train. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is a structural diagram of the opening state of the opening and closing mechanism in the prior art.

[0035] Figure 2 This is a first-person structural diagram of the opening and closing mechanism provided by this patent.

[0036] Figure 3a This is a schematic diagram of the support base and mounting base from the first perspective.

[0037] Figure 3b This is a structural diagram of the support base and the mounting base from the second perspective.

[0038] Figure 3c It is a schematic diagram of the structure of the support base and the mounting base from the third perspective.

[0039] Figure 3d It is a structural diagram of the support seat and the mounting seat limit block stopping state.

[0040] Figure 3e This is a first-perspective structural diagram of the support seat and the mounting seat limit studs in the stopping state.

[0041] Figure 3f This is a structural schematic diagram of the support seat and the mounting seat limit studs in the second perspective.

[0042] Figure 4a This is a schematic structural diagram of the opening and closing mechanism provided by the present invention from a second perspective.

[0043] Figure 4b for Figure 4a The structural diagram of the part is circled in the middle.

[0044] Figure 5a Schematic diagram comparing the hatch opening state of the opening and closing mechanism provided by the present invention and the opening and closing mechanism in the prior art.

[0045] Figure 5b Schematic diagram comparing the hatch opening state of the opening and closing mechanism provided by the present invention and the opening and closing mechanism in the prior art.

[0046] in:

[0047] 1- Base;

[0048] 2-movable cover, 201-first side opening, 202-second side opening;

[0049] 301-first side hatch, 302-second side hatch;

[0050] 401-first side door drive mechanism, 402-second side door drive mechanism;

[0051] 501-first side connecting arm, 502-second side connecting arm;

[0052] 6-mounting seat, 601-side plate, 602-bottom plate;

[0053] 7-support seat;

[0054] 801-first slide rail, 802-second slide rail;

[0055] 901-first slider, 902-second slider;

[0056] 10-limiting block;

[0057] 11-limiting stud;

[0058] 12-lower guide rail;

[0059] 13- lower support arm;

[0060] 14-cylinder body;

[0061] 15- telescopic rod;

[0062] 16-Anti-climbing device. DETAILED DESCRIPTION

[0063] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0064] It should be noted that when an element is referred to as being “disposed on” or “connected to” another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0065] It should be understood that the terms "upper," "lower," "horizontal," "inner," and "outer" and the like, indicating positions or relationships, are based on the positions or relationships depicted in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on the present invention. The terms "first," "second," and the like are used for descriptive purposes only and are not intended to imply importance.

[0066] The present invention provides a front-end opening and closing mechanism for a rail vehicle, mounted at the front end of the vehicle body. Conventional systems typically include a first side hatch and a second side hatch. Each hatch is driven by an independent drive mechanism, rotating relative to a mounting base and opening and closing relative to the front end of the vehicle body. When the hatches are open, the vehicle body attachment components at the front end are exposed. When the hatches are closed, the vehicle body attachment components at the front end are sealed.

[0067] Different from the structure of the opening and closing mechanism in the prior art, the present invention adds a design of a movable cover 2. The details are as follows.

[0068] Similar to the structure in the existing design, the opening and closing mechanism provided by this patent also includes a base 1. The base 1 is a frame structure that serves as the bearing structure of the entire opening and closing mechanism and can be installed on the rail vehicle body.

[0069] The present invention adds a movable cover 2 to the opening and closing mechanism. The cover comprises an annular body with a first side opening 201 and a second side opening 202 formed opposite each other. The first side opening 201 is located on the side away from the vehicle body. One end of the movable cover's second side opening 202 can be mounted to the vehicle body, and the overall streamlined structure of the movable cover 2 matches the vehicle body.

[0070] Similar to existing designs, the opening and closing mechanism also includes doors, specifically a first side door 301 and a second side door 302. Both doors are located at the end of the first side opening 201 of the movable cover. The first side door 301 is rotatably mounted on the base 1 via a first side connecting arm 501, while the second side door 302 is rotatably mounted on the base 1 via a second side connecting arm 502. The first and second side doors 301, 302 are capable of rotating relative to the base 1.

[0071] When the first side door 301 and the second side door 302 are relatively closed, the first side opening 201 can be closed. When the first side door 301 and the second side door 302 are relatively opened, the first side opening 201 will not restrict the movement of the two doors, and the two doors can pass through the two side edges of the first side opening 201 respectively.

[0072] Some manual opening and closing mechanisms can manually push the two doors open and close; automatic opening and closing mechanisms also include a door drive mechanism. Specifically, the door opening and closing mechanism includes a first side door drive mechanism 401 mounted on the base 1 and connected to the first side door, and a second side door drive mechanism 402 mounted on the base 1 and connected to the second side door. Both the first side door 301 and the second side door 302 can be driven to rotate around the base 1.

[0073] The movable cover 2 is mounted on the base 1 through the movable cover mounting mechanism. Figures 3a to 3fThe movable cover mounting mechanism includes a mounting seat 6 and a support seat 7. The mounting seat 6 is fixedly mounted on the base 1, and the movable cover 2 is mounted on the support seat 7. A sliding fitting structure is provided between the mounting seat 6 and the support seat 7, so that the movable cover 2 can move toward or away from the cabin door.

[0074] When the support base 7 moves along the movable engagement structure, the movable hood 2 moves accordingly. This structure provides a movable structure for the movable hood 2. When the doors are closed, the support base 7 is positioned at the front of the movable engagement structure by default. When the doors are opened, the support base 7 moves along the sliding engagement structure toward the vehicle body.

[0075] Hereinafter, an implementation form of a sliding fit structure is provided.

[0076] In some embodiments of the present invention, the sliding fit structure includes:

[0077] Slide rail: arranged on the end surface of the mounting seat 6;

[0078] Slider: mounted on the end surface of the support seat 7;

[0079] The slider is mounted on the slide rail and can move along the slide rail.

[0080] Specifically, to ensure symmetry and stability of the relative motion between the slider and the slide rail, in this embodiment, the slide rail includes a first slide rail 801 and a second slide rail 802, which are installed in parallel and spaced apart on the end surface of the mounting base 6. The slider includes a first slider 901 and a second slider 902, wherein the first slider 901 is installed on the first slide rail 801, and the second slider 902 is installed on the second slide rail 802.

[0081] In order to ensure stable relative movement between the mounting seat 6 and the support seat 7, and to avoid movement beyond a limited position affecting the normal opening and closing of the hatch, in some embodiments of the present invention, a first movable limiting structure is further provided on the mounting seat 6, which is located on the path of the slider moving toward the hatch, and can contact the slider after the slider moves into position to limit the movement of the slider. The first movable limiting structure can adopt a limiting block 10. One or two limiting blocks 10 can be selected as needed. If two limiting blocks 10 are provided, the two limiting blocks 10 are respectively installed on the mounting seat 6, and are respectively located in front of the first slide rail 801 and the second slide rail 802, that is, on the side away from the front of the vehicle. When the hatch is closed, the movable hood 2 moves toward the side close to the hatch, and when the movable hood 2 is just closed with the hatch, the slider contacts the limiting block 10 to limit the relative movement between the mounting seat 6 and the support seat 7. For specific reference Figure 3c and Figure 3d .

[0082] In some embodiments of the present invention, a second movement-limiting structure is provided on the support base 7 or the mounting base 6. The second movement-limiting structure is provided along the path of the movable cover 2 moving away from the hatch, and is used to limit the movement of the support base 7 away from the hatch. In other words, the second movement-limiting structure is provided on the side close to the vehicle body.

[0083] The following provides a specific implementation of the second movable limiting structure, referring to Figure 3e and Figure 3f .

[0084] In some embodiments of the present invention, the mounting base 6 includes a side panel 601 and a bottom panel 602. The side panels 601 are arranged perpendicular to the ground, while the bottom panel 602 is arranged parallel to the ground. The bottom panel 602 is located in the middle of the side panel 601, and a sliding fit structure is provided on the bottom panel 602; that is, the first slide rail 801 and the second slide rail 802 are spaced apart and rotated on the bottom panel 601. The bottom panel 602 being located in the middle of the side panel 601 should be understood as meaning that the side panel 601 has a portion located above and a portion located below the bottom panel 602.

[0085] The second movable limiting structure includes a limiting stud 11 installed on the support seat 7, and the limiting stud includes a protruding section arranged in the direction of the side plate 602 surface; during the movement of the support seat 7 toward the mounting seat 6, the protruding section can contact the side plate 602 surface located on the lower side of the base plate 602, and the limiting stud 11 stops the movement between the mounting seat 6 and the support seat 7.

[0086] In some embodiments, the limiting stud 11 can also be optionally provided on the mounting seat 6.

[0087] Some embodiments of the present invention further include a movable cover driving mechanism, wherein a power output end of the movable cover is connected to the support base to drive the support base to move toward or away from the cabin door along the sliding fitting structure.

[0088] In some embodiments of the present invention, in order to more conveniently drive the movable cover 2 to move, the movable cover driving mechanism is a pneumatic cylinder or an electric cylinder, and the pneumatic cylinder and the electric cylinder both include a cylinder body 14 and a telescopic rod 15; a rod hole is provided on the side plate 601, and the telescopic rod 15 passes through the rod hole on the side plate 601 where the cylinder body 14 is installed and is connected to the support seat 7.

[0089] In order to further ensure the reliability of the movement between the mounting seat 6 and the support seat 7, in some embodiments of the present invention, the mounting mechanism of the movable cover 2 is installed on the upper end surface of the base 1, and the opening and closing mechanism further includes a limiting motion structure arranged at the bottom of the base 1 for limiting the movement of the movable cover 2.

[0090] The limited motion structure includes:

[0091] Lower support arm 13: connected to the movable cover 2;

[0092] Lower guide rail 12: provided on the lower end surface of the base 1, arranged along the movement direction of the movable cover 2, that is, arranged along the direction parallel to the vehicle body;

[0093] A support arm slider is provided on the lower support arm 13 , and the support arm slider is arranged in the lower guide rail 12 .

[0094] In order to ensure the reliability of movement, in some embodiments of the present invention, the lower support arm includes a first support arm and a second support arm symmetrically arranged on both sides of the movable cover, and the lower guide rail includes a first side guide rail and a second side guide rail symmetrically arranged on the base; the slider on the first support arm is arranged in the first side guide rail, and the slider on the second support arm is arranged in the second side guide rail.

[0095] The following describes the working method of the opening and closing mechanism provided by the present invention.

[0096] The hatch opening process is as follows.

[0097] The movable cover driving mechanism is started, and the telescopic rod 15 is extended to push the movable cover 2 in a direction away from the vehicle body, thereby controlling the movable cover 2 to move in a direction away from the vehicle body.

[0098] Driven by first and second side door drive mechanisms 401 and 402, respectively, first and second side doors 301 and 302 move about base 1, opening the doors. Because the dimensions of first and second side doors 301 and 302 are smaller than those of the original doors, a motion trajectory that meets the requirements can be verified while maintaining a safe clearance with components such as anti-climber 16.

[0099] After the hatch opening action is completed, the movable cover 2 starts to move backward, that is, in a direction close to the plane of the vehicle body.

[0100] refer to Figure 5a and Figure 5b , a schematic diagram comparing the hatch opening states of the prior art opening and closing mechanism and the opening and closing mechanism of this patent. The first side hatch 301 in the figure shows the opening state of the opening and closing mechanism of the present invention, while the second side hatch 302 shows the opening state of the opening and closing mechanism of the prior art. The circled portion shows that the second side hatch 302 interferes with the anti-climbing device 16, allowing the first side hatch 301 to pass smoothly through the anti-climbing device 16.

[0101] The hatch closing process is as follows.

[0102] The movable cover driving mechanism is started, and the telescopic rod 15 is extended to push the movable cover 2 in a direction away from the vehicle body, thereby controlling the movable cover 2 to move in a direction away from the vehicle body.

[0103] After the movable cover 2 is fully opened, the first side door 301 and the second side door 302 are driven by the first side door driving mechanism 401 and the second side door driving mechanism 402 respectively to move around the base 1 and close.

[0104] After the hatch closing action is completed, the movable cover 2 starts to move backward, that is, in a direction close to the plane of the vehicle body.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rail vehicle front end opening and closing mechanism, characterized in that: include: base; The movable cover has an annular cover body, forming a first side opening and a second side opening that are oppositely arranged, wherein the first side opening is located on a side away from the vehicle body; Doors: including a first side door and a second side door, which are arranged at the first side opening end of the movable cover; the first side door is rotatably mounted on the base via a first side connecting arm, and the second side door is rotatably mounted on the base via a second side connecting arm; The movable cover mounting mechanism includes a mounting base and a support base. The mounting base is mounted on the base, and the movable cover is mounted on the support base. A sliding fit structure is provided between the mounting base and the support base, so that the movable cover can move toward or away from the cabin door. The dimensions of the movable cover and the hatch are configured such that when the first side hatch and the second side hatch are relatively closed, the first side opening can be closed; and when the first side hatch and the second side hatch are relatively opened, the first side hatch and the second side hatch can pass through the annular cover body of the movable cover.

2. The rail vehicle front end opening and closing mechanism according to claim 1, wherein: The sliding fit structure comprises: Slide rail: set on the end surface of the mounting seat; Slider: installed on the end surface of the support seat; The sliding block is mounted on the sliding rail and can generate relative motion.

3. The rail vehicle front end opening and closing mechanism according to claim 2, wherein: The slide rail includes a first side slide rail and a second side slide rail that are spaced apart, and the slider includes a first side slider and a second side slider that are detection-set. The first side slider is installed in conjunction with the first side slide rail, and the second side slider is installed in conjunction with the second side slide rail.

4. The rail vehicle front end opening and closing mechanism according to claim 2 or 3, characterized in that: The mounting seat is further provided with a first movement limiting structure, which is located on the path of the slider moving toward the cabin door and can contact the slider after the slider moves into position to limit the movement of the slider.

5. The rail vehicle front end opening and closing mechanism according to any one of claims 1 to 3, characterized in that: The support seat or the mounting seat is provided with a second movement limiting structure, which is arranged on the path of the movable cover moving away from the cabin door, and is used to limit the movement of the support seat away from the cabin door.

6. The rail vehicle front end opening and closing mechanism according to claim 5, characterized in that: The mounting base includes a side plate and a bottom plate, wherein the side plate is arranged in a direction perpendicular to the ground, and the bottom plate is arranged in a direction parallel to the ground. The bottom plate is located in the middle section of the side plate surface, and the bottom plate has a plate surface located above the side plate and a plate surface located below the side plate; the sliding fitting structure is arranged on the bottom plate; The second movable limiting structure includes a limiting stud installed on the support seat, and the limiting stud includes a protruding section arranged in the direction of the side panel surface; when the support seat moves toward the mounting seat, the protruding section can contact the side panel surface located below the bottom plate.

7. The rail vehicle front end opening and closing mechanism according to claim 1, wherein: It further includes a movable cover driving mechanism, a power output end of which is connected to the support base to drive the support base to move toward or away from the cabin door along the sliding matching structure.

8. The rail vehicle front end opening and closing mechanism according to claim 7, wherein: The mounting base includes side plates and a bottom plate, wherein the side plates are arranged in a direction perpendicular to the ground, and the bottom plate is arranged in a direction parallel to the ground; The movable cover driving mechanism is a pneumatic cylinder or an electric cylinder, and both the pneumatic cylinder and the electric cylinder include a cylinder body and a telescopic rod; a rod hole is provided on the side plate, and the telescopic rod passes through the rod hole on the side plate where the cylinder body is installed and is connected to the support seat.

9. The rail vehicle front end opening and closing mechanism according to claim 1, wherein: The movable cover mounting mechanism is mounted on the upper end surface of the base, and the opening and closing mechanism further comprises: Lower support arm: connected to the movable cover; Lower guide rail: set on the lower end surface of the base and arranged along the movement direction of the movable cover; The lower support arm is provided with a support arm slider, and the support arm slider is arranged in the lower guide rail.

10. The rail vehicle front end opening and closing mechanism according to claim 1, wherein: It further includes a door driving mechanism: a first side driving mechanism connected to the first side connecting arm, and a second side driving mechanism connected to the second side connecting arm. The first side driving mechanism and the second side driving mechanism can respectively drive the first side door and the second side door to move.

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