Opening and closing mechanism

Abstract

The present invention provides an opening and closing mechanism, including: a hatch: including a first hatch and a second hatch that can be opened and closed; a fixed cover: open on both sides, the two open ends are respectively a first end and a second end, and the hatch can cooperate with the first end of the fixed cover; an opening and closing actuator: used to control the opening and closing of the hatch, including a rotating shaft and a rotating arm, one end of the rotating arm is connected to the rotating shaft, and the other end is connected to the hatch; a switching mechanism is used to connect the fixed cover and the opening and closing actuator, connected to the fixed cover, and further connected to the rotating shaft of the opening and closing actuator. The opening and closing mechanism is a split opening and closing mechanism, and the hatch, the fixed cover, the rotating shaft mechanism and the pushing mechanism are independent submodules, and the submodules are directly or indirectly assembled through the switching mechanism. The modular assembly structure is designed to realize the modular assembly of the hatch and the fixed cover. This solution can solve the problems of repeated research and matching and complex debugging of the front-end opening and closing mechanism carried by the traditional metal frame.

Description

Technical Field

[0001] The invention relates to the technical field of rail vehicles, and in particular to a train opening and closing mechanism. Background Art

[0002] The front opening and closing mechanism of the EMU is used at the front end of the train, and its structure includes a door, actuating mechanism, a fixed cover, etc.

[0003] At present, the front-end opening and closing mechanism products of EMUs can be divided into two types according to the load-bearing mode and structural form: metal frame load-bearing and fiberglass load-bearing. The commonality of these two opening and closing mechanisms is that the action mechanism is connected to the cabin door, which can control the opening and closing of the cabin door to meet the requirements of train reconnection, rescue and other functions. The difference between these two opening and closing mechanisms is mainly reflected in the load-bearing mechanism.

[0004] 1. The front-end opening and closing mechanism supported by the metal frame is mainly composed of a hatch, a fixed cover, a bearing mechanism (metal frame), an actuating mechanism, etc. The hatch is generally made of fiberglass. When the hatch is open, it is used to connect the front-end hook, and when the hatch is closed, it protects the internal equipment; the fixed cover is a non-bearing structure, which only cooperates with the hatch to form a complete front-end popular shape; the bearing structure, including the metal frame connecting the hatch, the fixed cover and the vehicle body, is used to install the hatch and other structures on the vehicle, and at the same time bears the weight of other components inside the front-end opening and closing mechanism and the air resistance when the train is running; the actuating mechanism is used to drive the hatch to open and close.

[0005] 2. The FRP front-end opening and closing mechanism is mainly composed of a hatch, a fixed cover, and an actuating mechanism. The hatch is generally made of FRP material. When the hatch is open, it is used to connect the front-end hook, and when the hatch is closed, it protects the internal equipment. Unlike metal structures, the fixed cover of the FRP front-end opening and closing mechanism is used as a bearing structure to bear the weight of other components inside the front-end opening and closing mechanism and the air resistance when the train is running; the actuating mechanism is used to drive the hatch to open and close.

[0006] For the front-end opening and closing mechanism supported by the metal frame, the non-load-bearing fixed cover and the metal frame are installed separately with the vehicle body, and there are two or even more installation datums. The hatch and the fixed cover are assembled after the fixed cover is installed with the metal frame. Due to the defects of the product structure itself (especially the structure of the metal frame), it is difficult to ensure the matching size between the fixed cover and the hatch after installation. The disadvantage of this method is that the gap between the hatch and the fixed cover needs to be repeatedly matched during installation, and the grinding and repairing of the fiberglass is complicated. For the front-end opening and closing mechanism supported by the fiberglass, the hatch, the load-bearing fixed cover, and the motion mechanism are installed as a whole with the vehicle body after matching. There is only one installation datum between the load-bearing fixed cover and the vehicle body, and there is no need to repeatedly match between the hatch and the fixed cover. However, the fixed cover used in the front-end opening and closing mechanism of this method is thicker and heavier, which is not conducive to product weight management. Summary of the invention

[0007] The purpose of the present invention is to provide a split metal frame opening and closing mechanism with a modular structure and easy assembly, so as to improve the installation method of the metal frame opening and closing mechanism, in order to solve the problem that during the installation process of the metal frame opening and closing mechanism, feedback grinding and matching gaps are required, which makes the installation process complicated and inconvenient.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] An opening and closing mechanism, comprising:

[0010] Doors: including a first door and a second door that can be opened and closed;

[0011] Fixed cover: double-sided opening, the two open ends are respectively a first end and a second end, and the hatch can be matched with the first end of the fixed cover;

[0012] Opening and closing actuator: used to control the opening and closing of the hatch, including a rotating shaft and a rotating arm, one end of the rotating arm is connected to the rotating shaft, and the other end is connected to the hatch;

[0013] The transfer mechanism is used to connect the fixed cover and the opening and closing actuator, is connected to the fixed cover, and is further connected to the rotating shaft of the opening and closing actuator.

[0014] Preferably, the opening and closing mechanism further includes a power pushing mechanism, which includes a mounting frame and a power unit arranged on the mounting frame, the mounting frame is connected to the switching mechanism, and the power unit is connected to the rotating arm.

[0015] Preferably, the transfer mechanism comprises a base, on which a first seat plate and a second seat plate are provided with a height difference, the first seat plate is connected to the fixed cover, and the second seat plate is connected to the rotating shaft.

[0016] Preferably, the mounting frame is connected to the base.

[0017] Preferably, the mounting frame includes a mounting platform and a mounting beam disposed on the mounting platform, the mounting platform is connected to a base, the power unit is disposed on the mounting platform, and the mounting beam is used for mounting to a vehicle.

[0018] Preferably, the opening and closing mechanism further comprises at least one set of locking structures for locking the cabin door and the switching mechanism, wherein the locking structures are mounted on the base body and include:

[0019] main body;

[0020] a locking pin mounted on the main body;

[0021] A transmission shaft, arranged on the main body;

[0022] A locking plate, mounted on the base body, and having a locking groove thereon;

[0023] The transmission shaft can drive the main body to rotate, so as to drive the locking pin to be inserted into the locking slot, or to be withdrawn from the locking slot; a locking matching structure is provided on the rotating arm or the cabin door, and when the cabin door is closed, the locking matching structure cooperates with the locking pin to limit the rotation of the cabin door.

[0024] Preferably, the locking matching structure is a limit block arranged on the end surface of the rotating arm facing the locking plate, and after the locking pin is inserted into the locking groove, the locking pin limits the movement of the limit block.

[0025] Preferably, the transmission shaft passes through the first seat plate to the outside of the fixed cover.

[0026] Preferably, the mating mounting surfaces of the base and the mounting platform are provided with oblong holes.

[0027] Compared with the prior art, the opening and closing mechanism provided by the present invention has the following beneficial effects:

[0028] The opening and closing mechanism is a split opening and closing mechanism. The hatch, fixed cover, shaft mechanism and push mechanism are independent submodules, and the submodules are assembled directly or indirectly through the adapter mechanism. Through the design of modular assembly structure, the modular assembly of the hatch and fixed cover is realized. This solution can solve the problems of repeated research and development, complex debugging, etc. of the traditional metal frame-bearing front-end opening and closing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative labor.

[0030] Figure 1 It is a schematic diagram of the fixed cover structure;

[0031] Figure 2 It is a three-dimensional schematic diagram of the transfer mechanism structure;

[0032] Figure 3 It is a schematic diagram of the side view of the transfer mechanism structure;

[0033] Figure 4 is a schematic diagram of the locking plate structure;

[0034] Figure 5 is a schematic diagram of the locking member structure;

[0035] Figure 6 It is a schematic diagram of the installation structure of the transfer mechanism and the fixed cover;

[0036] Figure 7 It is a schematic diagram of the installation structure of the transfer mechanism and the fixed cover, the rotating shaft and the rotating arm;

[0037] Figure 8 It is a schematic diagram of the installation structure of the transfer mechanism and the fixed cover, the rotating shaft and the rotating arm (including the locking mechanism);

[0038] Fig. 9 It is a schematic diagram of the installation structure of the transfer mechanism and the mounting frame;

[0039] Fig.10 It is a schematic diagram of the overall assembly structure of the opening and closing mechanism;

[0040] Among them, the reference numerals in the figure are:

[0041] 101-first hatch, 102-second hatch;

[0042] 2-fixed cover, 201-first end, 202-second end, 203-installation plane;

[0043] 301-first rotating shaft, 302-first rotating arm, 303-second rotating shaft, 304-second rotating arm;

[0044] 401 base, 402-first seat plate, 4021-shaft groove, 4022-first sub-seat plate, 4023-second sub-seat plate, 403-second seat plate, 4031-rotating shaft mounting hole, 404-locking plate, 4041-locking groove, 405-locking plate mounting seat;

[0045] 5-mounting frame, 501-mounting platform, 502-longitudinal beam;

[0046] 6- Push cylinder;

[0047] 7- Push installation mechanism;

[0048] 8- Push rod;

[0049] 9- oblong hole;

[0050] 10-locking piece, 1001-main body, 1002-locking pin;

[0051] 11-Open the limit stop;

[0052] 12-Close the limit stop;

[0053] 13-Limiting block. DETAILED DESCRIPTION

[0054] 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 in conjunction with 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.

[0055] 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.

[0056] It should be understood that the terms "upper", "lower", "vertical", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are 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 on the present invention.

[0057] The present invention provides an opening and closing mechanism for a train, which realizes modular assembly of a door and a fixed cover through the design of a modular assembly structure. This solution can solve the problems of repeated research and development, complex debugging, etc. of a traditional metal frame-bearing front-end opening and closing mechanism.

[0058] An opening and closing mechanism comprises a cabin door, a fixed cover, an opening and closing actuator and a switching mechanism.

[0059] Hatch door: includes a first hatch door 101 and a second hatch door 102 that can be opened and closed; the hatch door is a double-opening structure, when the first hatch door 101 and the second hatch door 102 are relatively opened, the opening and closing mechanism is opened, and the two vehicles can be coupled, when the coupling is completed, the first hatch door 101 and the second hatch door 102 are closed to protect the internal components of the opening and closing mechanism.

[0060] Fixed hood 2: structural reference Figure 1 , double-sided openings, the two opening ends are respectively a first end 201 and a second end 202, and the hatch can be matched with the first end 201 of the fixed cover;

[0061] Opening and closing actuator: used to control the opening and closing of the hatch, including a rotating shaft and a rotating arm, one end of the rotating arm is connected to the rotating shaft, and the other end is connected to the hatch; accordingly, the first hatch 101 and the second hatch 102 correspond to a set of rotating shaft and rotating arm mechanisms respectively, wherein the first rotating shaft 301 and the first rotating arm 302 are arranged on the side of the first hatch 101, and are used to control the opening and closing of the first hatch 101, and the second rotating shaft 303 and the second rotating arm 304 are arranged on the side of the second hatch 102, and are used to control the opening and closing of the second hatch 102;

[0062] The switching mechanism is used to connect the fixed cover 2 and the opening and closing actuator, is connected to the fixed cover 2, and is further connected to the rotating shaft of the opening and closing actuator.

[0063] Furthermore, the opening and closing mechanism also includes a power pushing mechanism, which is used to control the opening and closing of the cabin door. The power pushing mechanism includes a mounting frame 5 and a power unit arranged on the mounting frame. The mounting frame 5 is connected to the switching mechanism, and the power unit is connected to the rotating arm.

[0064] The transfer mechanism is detachably connected to the fixed cover 2 and the opening and closing actuator, thus forming a modular transfer connection between the fixed cover 2 and the opening and closing actuator; the transfer mechanism and the power push mechanism are also detachably mounted, thus forming a modular transfer connection between the power push mechanism and the front fixed cover and the opening and closing actuator, so that the entire opening and closing mechanism can be assembled modularly.

[0065] The specific implementation form of the transfer mechanism is as follows, the structure reference Figure 2 and Figure 3 .

[0066] The switching mechanism includes a base 401, on which a first seat plate 402 and a second seat plate 403 are arranged at a height difference, the first seat plate 402 is connected to the fixed cover 2, and the second seat plate 403 is connected to the rotating shaft. Specifically, a first seat plate mounting plane 203 is processed on the inner side of the second end 202 of the fixed cover 2, and the first seat plate 402 is mounted on the mounting plane 203 through a fixing member. After installation, the second seat plate 403 is located on the upper side of the first seat plate 402, and two rotating shaft mounting holes 4031 are arranged on the second seat plate 403, and the first rotating shaft 301 and the second rotating shaft 303 are respectively mounted in the two rotating shaft mounting holes 4031.

[0067] Furthermore, in order to control the opening and closing of the hatch, the opening and closing mechanism further includes a power pushing mechanism, which includes a mounting frame 5 and a pushing cylinder 6 arranged on the mounting frame 5; the mounting frame 5 is connected to the base 401, and the pushing cylinder 6 is connected to the rotating shaft. Among them, the mounting frame 5 is an L-shaped frame, and its main part includes a mounting platform 501 and a longitudinal beam 504 arranged on the mounting platform 501. The pushing cylinder 6 is installed on the mounting platform 501, and the longitudinal beam 504 is used to install the opening and closing mechanism as a whole to the vehicle. The pushing cylinder 6 is connected to the pushing mounting mechanism 7, and the pushing mounting mechanism 7 is connected to two pushing rods 8, which are respectively installed on the first rotating arm 302 and the second rotating arm 304. Based on this structure, the power pushing mechanism is further regarded as an independent module, and the modular assembly of this part is realized through the transfer structure.

[0068] Furthermore, in order to achieve stable installation of the mounting frame 5, the side of the base 401 facing the mounting frame 5 is angled. Figure 3 The angle structure can be clearly seen; the mounting frame 5 is stuck at the angle and fixedly mounted on the end surface on the upper side of the angle. An oblong hole 9 is provided on the end surface where the base 401 and the mounting frame 5 are mounted, so as to facilitate adjustment of the mounting positions of the two to suit the vehicle installation conditions. Specifically, both end surfaces of the angle structure of the base 401 are adapted to the mounting frame 5, and both end surfaces are provided with an oblong hole 9. Fig. 9 The assembly state of the mounting frame 5 and the switching mechanism can be seen.

[0069] Furthermore, in order to lock the door in the closed state, the opening and closing mechanism is also provided with a locking mechanism. There is at least one set of locking mechanisms, which can be installed on one side or both sides. Figure 4 and Figure 5 .

[0070] Specifically, the locking structure includes a locking member 10, which is mounted on a base 401 and includes:

[0071] Main body 1001;

[0072] A locking pin 1002, mounted on the main body 1001;

[0073] A transmission shaft 1003 is provided on the main body 1001;

[0074] A locking plate 404 is mounted on the base 401 and has a locking groove 4041 thereon;

[0075] Rotating the transmission shaft 1003 can drive the main body 1001 to rotate, so as to drive the locking pin 1002 to insert into the locking groove 4041, or to withdraw from the locking groove 4041. A locking matching structure is provided on the rotating arm or the hatch, and when the hatch is closed, the locking matching structure cooperates with the locking pin to limit the rotation of the hatch. Specifically, rotating the transmission shaft 1003 causes the locking pin 1002 to insert into the locking groove 4041, and when the hatch is closed, the movement of the hatch is limited to prevent the hatch from opening abnormally.

[0076] The locking matching structure is a limit block 13 arranged on the end surface of the rotating arm facing the locking plate. After the locking pin 1002 is inserted into the locking groove 4041 , the locking pin limits the movement of the limit block 13 .

[0077] Furthermore, the transmission shaft 1003 passes through the first seat plate to the outside of the fixed cover 2, so that the staff can rotate the transmission shaft 1003 from the outside of the fixed cover 2 to rotate the locking pin 1002. Specifically, in this embodiment, the first seat plate includes a first sub-seat plate 4022 and a second sub-seat plate 4023 arranged at intervals, and the two sub-seat plates are arranged at intervals, and the intermediate interval position is clamped on the beam of the fixed cover 2. Correspondingly, the first sub-seat plate 4022 is provided with an axis groove 4021, and the transmission shaft 1003 passes through the axis groove 4021 and further passes through the fixed cover 2.

[0078] If a double-sided locking structure is provided, a locking piece is also installed on the rotating arm on the other side. Accordingly, the second sub-seat plate 4023 is also provided with an axis groove for the rotating shaft on one side to pass through the axis groove to the outside of the fixed cover 2.

[0079] Reference diagram of the matching structure of the transfer mechanism and the fixed cover 2 Figure 7 and Figure 8 , the difference between the two lies in whether a locking structure is installed.

[0080] Furthermore, in order to limit the opening and closing states of the hatch, the opening and closing mechanism is usually equipped with an opening limit stopper 11 and a closing limit stopper 12. In this embodiment, the closing limit stopper 11 is arranged on opposite sides of the hatch closing direction of the two rotating arms. When the hatch is closed, the closing limit stoppers 11 on the two rotating arms contact to limit the closing movement of the hatch. The opening limit stopper 12 is arranged on opposite sides of the hatch opening direction of the two rotating arms. When the hatch is opened, the opening limit stoppers 12 on the two rotating arms contact to limit the opening movement of the hatch. In addition, the opening limit stopper 11 and the closing limit stopper 12 can also be selected to be installed at a suitable position on the fixed cover.

[0081] In combination with the structure of the opening and closing mechanism of the present invention, the assembly method of the opening and closing mechanism in the prior art is introduced: one side of the mounting beam of the mounting frame is installed to the vehicle body, and then the fixed cover is installed to the vehicle body, and then the pushing mechanism, the opening and closing actuator and the hatch are further installed. There are many installation bases and the operation is complicated.

[0082] The following will describe the specific assembly method of the modular split opening and closing mechanism. Fig.10 .

[0083] 1. Pre-assemble the first hatch 101 and the second hatch 102 with the fixed cover 2 respectively: Specifically, install the first seat plate 402 of the switching mechanism on the fixed cover 2, install the first rotating shaft 301 and the second rotating shaft 303 in the rotating shaft mounting hole 4031 of the second seat plate 403, and the upper and lower mounting planes of the rotating shaft mounting hole 4031 are integrally formed by paste-forming with glass fiber reinforced plastics, and connected with structures such as reinforcing ribs to improve the overall rigidity of the non-load-bearing fixed cover; the first rotating arm 302 and the second rotating arm 304 are respectively assembled with the first rotating shaft 301 and the second rotating shaft 303 to ensure the rotation The arm rotates around the shaft flexibly and smoothly; the first hatch 101 is installed on the first rotating arm 302, and the second hatch 102 is installed on the second rotating arm 304; the opening limit stop 11 and the closing limit stop 12 are installed on the rotating arm, the rotating shaft or the fixed cover to ensure that the first hatch 101 and the second hatch 102 are effectively limited in the open position and the closed position; then the locking piece 10 is installed on the rotating arm, and the locking plate 404 is installed on the base 401 to ensure that the hatch is effectively locked in the closed position; finally, the gap between the hatch and the fixed cover is polished and repaired to the specified size.

[0084] 2. Assemble the power push installation mechanism in accordance with relevant requirements. Specifically, assemble the installation frame 5, the cylinder 6, the push installation mechanism 7 and the push rod 8 together.

[0085] 3. Use the mounting bolts to connect the flange edge of the fixed cover 2 and the vehicle body, and install the pre-assembled hatch and the fixed cover 2 as a whole on the vehicle body installation reference.

[0086] 4. Use mounting bolts to install the push mounting mechanism 7 on the vehicle body mounting reference.

[0087] 5. Use the push rod 8 to connect the rotating arm and the push installation mechanism 7. During installation, adjust the length of the push rod 8 to ensure that the door moves smoothly without jamming.

[0088] 6. Use mounting bolts to connect the adapter mechanism and the push-mounting mechanism. The connection between the adapter mechanism and the push-mounting mechanism is provided with an oblong hole 9 and other adjustment structures, and gaskets are inserted longitudinally, vertically and horizontally to adjust the assembly error.

[0089] In addition to the above installation sequence, the following installation sequence can also be used. The front opening and closing mechanism is installed in a split manner using the above steps, but a conventional assembly scheme can also be used, that is, the rotating arm (3), the rotating shaft (4), the opening limit stopper, the closing limit stopper, the push rod 8, the push installation mechanism 7, and the locking mechanism are first pre-assembled into a metal frame as a whole, the fixed cover 2 is separately installed on the vehicle body installation reference, the pre-assembled metal frame as a whole is installed on the vehicle body installation reference, and then the hatch is installed and debugged, and finally the gap between the hatch and the fixed cover 2 is polished and repaired to the specified requirements.

[0090] The present invention is used to design a split metal frame to carry the front-end opening and closing mechanism, and part of the metal mechanism can be pre-assembled with the hatch and the fixed cover into a modular functional product. This pre-assembly is installed as a whole on the fiberglass mounting base of the vehicle body (i.e. the vehicle body mounting base mentioned above), and then the remaining metal mechanism is installed on the metal part mounting base of the vehicle body (i.e. the vehicle body mounting base mentioned above), and finally the two components are effectively connected by a push rod 8, mounting bolts, etc. to form a complete front-end opening and closing mechanism product. This solution can solve the problems of repeated research and development, complex debugging, etc. of the traditional metal frame carrying the front-end opening and closing mechanism.

[0091] 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 protection scope of the present invention.

Claims

1. An opening and closing mechanism, characterized in that: include: Doors: including a first door and a second door that can be opened and closed; Fixed cover: open on both sides, the two open ends are respectively a first end and a second end, and the hatch can be matched with the first end of the fixed cover; Opening and closing actuator: used to control the opening and closing of the hatch, including a rotating shaft and a rotating arm, one end of the rotating arm is connected to the rotating shaft, and the other end is connected to the hatch; A transfer mechanism, used to connect the fixed cover and the opening and closing actuator, connected to the fixed cover, and further connected to the rotating shaft of the opening and closing actuator; The transfer mechanism comprises a base body; The opening and closing mechanism further comprises at least one set of locking structures for locking the cabin door and the switching mechanism, wherein the locking structures are mounted on the base body and include: main body; a locking pin mounted on the main body; A transmission shaft is arranged on the main body, and the transmission shaft passes through the first seat plate to the outside of the fixed cover; A locking plate, mounted on the base body, and having a locking groove thereon; The transmission shaft can drive the main body to rotate, so as to drive the locking pin to insert into the locking slot, or withdraw from the locking slot; a locking matching structure is arranged on the rotating arm or the cabin door, and when the cabin door is closed, the locking matching structure cooperates with the locking pin to limit the rotation of the cabin door; the locking matching structure is a limit block arranged on the side of the rotating arm facing the locking plate.

2. The opening and closing mechanism according to claim 1, characterized in that: The opening and closing mechanism further includes a power pushing mechanism, which includes a mounting frame and a power unit arranged on the mounting frame, the mounting frame is connected to the switching mechanism, and the power unit is connected to the rotating arm.

3. The opening and closing mechanism according to claim 1, characterized in that: A first seat plate and a second seat plate are arranged on the base body with a height difference, the first seat plate is connected to the fixed cover, and the second seat plate is connected to the rotating shaft.

4. The opening and closing mechanism according to claim 2, characterized in that: A first seat plate and a second seat plate are arranged on the base body with a height difference, the first seat plate is connected to the fixed cover, and the second seat plate is connected to the rotating shaft.

5. The opening and closing mechanism according to claim 4, characterized in that: The mounting frame is connected to the base.

6. The opening and closing mechanism according to claim 5, characterized in that: The mounting frame includes a mounting platform and a mounting beam arranged on the mounting platform, the mounting platform is connected to a base, the power unit is arranged on the mounting platform, and the mounting beam is used for being mounted on a vehicle.

7. The opening and closing mechanism according to claim 1, characterized in that: After the locking pin is inserted into the locking groove, the locking pin limits the movement of the limiting block.

8. The opening and closing mechanism according to claim 6, characterized in that: The matching mounting surfaces of the base and the mounting platform are provided with oblong holes.

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