Drive mechanism, carriage and semi-trailer

Abstract

The present invention relates to a drive mechanism (1) for opening and closing a carriage door of a freight car, a carriage (10) and a semi-trailer. The drive mechanism (1) includes an upper pull plate (4), a flexible connecting member (5) having one end connected to the upper pull plate (4), and a support column (6) provided on the upper pull plate (4). In the drive mechanism of the semi-trailer of the present invention, a flexible connecting member is used to replace the rigid active pull rod in the prior art. Thus, during the process of opening and closing the door, it is avoided that the rigid active pull rod enters the interior of the carriage during movement and collides with the goods therein.

Description

Technical Field

[0001] The present invention relates to the technical field of special vehicles, and particularly to a driving mechanism with an upper pulling plate, a carriage and a semi-trailer using the driving mechanism. Background Art

[0002] Patent CN204998395U discloses a wing-opening truck. The side compartment door of the truck compartment is divided into an upper wing plate and a lower flap, and these two compartment plates are actuated by an active pull rod and a driven swing rod. In this patent, the opening and closing of the compartment door are only achieved by the rotation of two rods. Combining with the drawings of this patent, in this way, the movement trajectory of the active pull rod will pass through the interior of the compartment. Therefore, during the process of opening and closing the door, the pull rod will collide with the goods inside the compartment, resulting in the mechanism being stuck or the goods being damaged. Summary of the Invention

[0003] An object of the present invention is to provide a driving mechanism for opening and closing a truck compartment door, and the components of this mechanism do not intrude into the interior of the compartment during the process of opening or closing the truck compartment door; and a carriage and a semi-trailer using this driving mechanism.

[0004] To achieve the above object, the present invention provides a driving mechanism for opening and closing a truck compartment door, including an upper pulling plate, a flexible connecting member connected to one end of the upper pulling plate, and a support column provided on the upper pulling plate.

[0005] According to an aspect of the present invention, it further includes a lower pull rod. The lower pull rod includes a main rod and adjusting cylinders provided at both ends of the main rod. One of the two adjusting cylinders is connected to the flexible connecting member;

[0006] External threads are provided at both ends of the main rod, and internal threads corresponding to the external threads on the main rod are provided on the adjusting cylinders.

[0007] According to an aspect of the present invention, it further includes a mounting plate, a first limit sleeve and a second limit sleeve sleeved on the support column;

[0008] The first limit sleeve and the second limit sleeve are located between the mounting plate and the upper pulling plate and are respectively fixedly connected to the two;

[0009] First limit protrusions and second limit protrusions arranged at intervals in a ring along the central axis are respectively provided on the facing surfaces of the first limit sleeve and the second limit sleeve;

[0010] The first limit protrusions and the second limit protrusions are arranged alternately;

[0011] The flexible connecting member is connected to one end of the mounting plate away from the first limit sleeve.

[0012] According to one aspect of the present invention, the included angle between the symmetry center line of the mounting plate and the symmetry center line of the upper pulling plate is 2° - 3°.

[0013] According to one aspect of the present invention, it further includes a first guide member and a second guide member.

[0014] According to one aspect of the present invention, the flexible connecting member is a chain, and the first guide member and the second guide member are sprockets;

[0015] At one end of the flexible connecting member connecting the upper pulling plate, there are two parallel connecting plates.

[0016] According to one aspect of the present invention, the flexible connecting member is a steel wire rope, and the first guide member and the second guide member are pulleys or cylindrical barrels / posts.

[0017] A carriage, including a bottom plate, a top plate, a rear door, a door assembly including an upper carriage door and a lower carriage door, and columns supported between the bottom plate and the top plate. The two ends of the upper pulling plate are respectively hinged to the upper carriage door and the columns, and the flexible connecting member is respectively connected to the upper pulling plate and the lower carriage door.

[0018] According to one aspect of the present invention, the adjusting cylinder at one end of the lower pull rod is hinged to the lower carriage door, and the adjusting cylinder at the other end is connected to the flexible connecting member.

[0019] According to one aspect of the present invention, the first guide member and the second guide member are arranged alternately from top to bottom on the columns, and both of them and the support column are located on the same side of the flexible connecting member;

[0020] The hinge point between the upper pulling plate and the column is located between the first guide member and the second guide member.

[0021] According to one aspect of the present invention, the door assembly is symmetrically arranged on both sides of the carriage.

[0022] According to one aspect of the present invention, slideway mounting grooves and damping mounting grooves extending along the width direction of the carriage and communicating with each other are respectively provided on the upper and lower surfaces of the top plate.

[0023] According to one aspect of the present invention, it further includes a slideway arranged in the slideway mounting groove, a support rod with one end connected to the upper carriage door, and a sliding body located at the other end of the support rod. The sliding body is a pulley;

[0024] A limiting member is provided in the slideway, and the limiting member is a setscrew.

[0025] According to one aspect of the present invention, the length of the support rod on one side of the carriage is greater than that on the other side.

[0026] According to one aspect of the present invention, it further includes a damping member disposed in the damping mounting groove, and the damping member is a spring.

[0027] According to one aspect of the present invention, one end of the damping member is fixed to the end of the damping mounting groove, and the other end is connected to the support rod.

[0028] According to one aspect of the present invention, it further includes a connecting member with one end connected to the upper compartment door and the other end connected to the column, and the connecting member is a steel wire rope.

[0029] According to one aspect of the present invention, a first sealing strip is provided at each edge where the upper compartment door and the lower compartment door meet when the compartment door is closed;

[0030] A second sealing strip is provided along the two side edges of the carriage on the upper surface of the top plate.

[0031] According to one aspect of the present invention, a compartment door lock is provided on the lower compartment door.

[0032] A semi-trailer includes a running system located at the bottom of the carriage;

[0033] The running system includes a vehicle frame mounted on the bottom plate and a wheel set mounted on the vehicle frame.

[0034] According to the present invention, all components of the driving mechanism for driving the opening and closing of the freight car compartment door are arranged outside the space of the carriage for loading goods, and during the opening or closing process, none of the components will intrude into the space for loading goods. Therefore, during the process of opening and closing the compartment door, any components of the mechanism for driving and guiding the control of the compartment door will not interfere with the goods loaded in the carriage. In this way, it is possible to avoid that during the process of opening and closing the door, some components or parts will enter the carriage and thus collide with the goods inside the carriage. Moreover, there is no need for hydraulic or motor drive, the compartment board can be quickly opened, the opening is flexible and reliable, time-saving and labor-saving, and the cost is relatively low.

[0035] According to one solution of the present invention, an installation plate and two limit sleeves are provided. The first limit sleeve is fixedly connected to the installation plate, and the second limit sleeve is fixedly connected to the upper pull plate. Then, the support column passes through the upper pull plate, the two limit sleeves and the installation plate in sequence, so that the installation plate can rotate on the support column. A flexible connecting member is connected to the end of the installation plate away from the first limit sleeve. During the process of opening or closing the compartment door, since the installation plate swings a fixed angle under the traction of the flexible connecting member, jamming during the operation of the mechanism can be avoided. The two limit sleeves are provided with a first limit protrusion and a second limit protrusion on the mutually facing surfaces, and the positions of the two limit protrusions are staggered to form mutual abutment when the installation plate rotates, thereby limiting the rotation angle range of the installation plate.

[0036] According to one aspect of the present invention, the lower pull rod has a main rod and adjusting cylinders located at both ends of the main rod. The adjusting cylinders and the main rod are connected by threads. Thus, after the flexible connecting member is deformed after long-term use, the length of the lower pull rod can be adjusted accordingly, so that this mechanism can be used for a long time and is also relatively convenient to install.

[0037] According to one aspect of the present invention, a first guiding member and a second guiding member are provided on the column. These two guiding members are arranged at intervals from top to bottom, serving to guide the flexible connecting member, and can prevent the flexible connecting member from deviating during the process of opening and closing the door.

[0038] According to one aspect of the present invention, the flexible connecting member is a chain, and the two guiding members are sprocket wheels, which can make the process of opening and closing the door smoother. The flexible connecting member can also be a steel wire rope, and then the two guiding members are pulleys or cylindrical barrels / columns. This structure is relatively simple and has a lower design difficulty.

[0039] According to one aspect of the present invention, a damping member is provided in the carriage. The damping member is installed in a damping installation groove under the carriage roof and is connected to the support rod. In this way, during the process of opening and closing the door, the impact of the carriage door can be reduced, and the action of opening and closing the door can be assisted to achieve the purpose of saving effort.

[0040] According to one aspect of the present invention, each set of carriage door assemblies is separately equipped with two sets of driving mechanisms. Thus, there are a total of four sets of carriage door assemblies in the carriage, and each set can independently open and close the door.

[0041] According to one aspect of the present invention, the lengths of the support rods on both sides of the carriage are different, so as to prevent the upper carriage doors on both sides from colliding when the carriage doors are fully opened.

[0042] According to one aspect of the present invention, a connecting member is further connected between the upper carriage door and the column. The connecting member is a steel wire rope, which can assist the upper carriage door to act according to a specified trajectory.

[0043] According to one aspect of the present invention, a first sealing strip is provided at the edge of each of the upper carriage door and the lower carriage door, and second sealing strips are provided on both sides along the width direction of the carriage roof. The second sealing strips extend along the length direction of the carriage. In this way, a good sealing effect can be achieved when the carriage door is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a schematic partial cross-sectional view of the right side of a carriage according to an embodiment of the present invention;

[0045] Figure 2 is Figure 1 an enlarged view at A;

[0046] Figure 3Is an isometric view schematically showing a first limiting sleeve according to an embodiment of the present invention;

[0047] Figure 4 Is a schematic diagram showing the cooperation of a mounting plate and an upper pulling plate according to an embodiment of the present invention;

[0048] Figure 5 Is an isometric view schematically showing a connecting plate according to an embodiment of the present invention;

[0049] Figure 6 Is a structural diagram schematically showing a semi-trailer according to an embodiment of the present invention. Detailed implementation manners

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0051] When describing the embodiments of the present invention, the orientation or positional relationships expressed by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" are based on the orientation or positional relationships shown in the relevant drawings. It 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. Therefore, the above terms should not be construed as limiting the present invention.

[0052] The present invention will be described in detail below with reference to the drawings and specific implementation manners. The implementation manners cannot be described in detail one by one here, but the implementation manners of the present invention are not limited to the following implementation manners.

[0053] Figure 1 Is a partial right-side cross-sectional view of a carriage schematically showing an embodiment of the present invention. Refer to Figure 1 , which shows a cross-section of the carriage part of a semi-trailer including a truck carriage door opening and closing mechanism according to the present invention. For clarity, Figure 1 the walking system of the semi-trailer is omitted. Figure 1 The side walls on the left and right sides of the shown truck carriage are composed of an upper carriage door 1041 and a lower carriage door 1042 that can be opened and closed, and both the upper carriage door 1041 and the lower carriage door 1042 are rectangular. Figure 1The left side door of the truck compartment shown is in the closed state, while the right side door is in the fully open state. In an embodiment of the present invention, by flipping down the lower door 1042, the upper door 1041 is synchronously flipped up to the fully open position at the top of the compartment.

[0054] In Figure 1 , when in the fully open state, the upper door 1041 is located at the top of the truck compartment, while the lower door 1042 is flipped down and hinged to the side edge of the truck compartment floor, and finally hangs below the truck compartment floor in the fully open state.

[0055] In Figure 1 The right part of schematically shows a driving mechanism 1 for opening and closing the truck compartment door according to an embodiment of the present invention. In this embodiment, the driving mechanism 1 includes an upper pull plate 4, a flexible connecting member 5, and a support column 6. One end of the upper pull plate 4 is hinged to the upper door 1041, and the hinge point is close to the long side of the upper panel 1041; the other end is hinged to the column 105 in the compartment. One end of the flexible connecting member 5 is connected to the upper pull plate 4, and the other end is connected to the lower door 1042 in the compartment. The support column 6 is provided on the upper pull plate 4. In addition, the driving mechanism 1 of the present invention further includes a lower pull rod 2, a first guide member 8, and a second guide member 9. In this embodiment, the flexible connecting member 5 in the driving mechanism 1 is indirectly connected to the lower door 1042 through the lower pull rod 2. For example, one end of the lower pull rod 2 is connected to the flexible connecting member 5, and the other end is hinged to the lower door 1042. Thus, due to the flexible connecting member 5, the lower pull rod 2 will not enter the compartment during the door opening and closing process, so that it will not collide with the goods and get stuck.

[0056] On the upper and lower surfaces of the top plate 102 in the carriage, there are respectively provided a slideway installation groove and a damping installation groove that extend in the width direction of the carriage and communicate with each other. In the carriage of the present invention, there are also included a slideway 12, a support rod 13, and a sliding body 14. In this embodiment, the sliding body 14 is a pulley. Of course, other standard parts can also be selected as the slideway 12 and the sliding body 14. The slideway 12 is arranged in the slideway installation groove with its side facing downwards. The sliding body 14 is arranged at one end of the support rod 13 and can slide in the slideway 12 in the width direction of the carriage. The other end of the support rod 13 is connected to the long side edge of the upper carriage door 1041 far from the upper pulling plate 4. At both ends in the slideway 12, there are provided limit members 18 for restricting the movement space of the sliding body 14. In this embodiment, the limit member 18 is a setscrew, which is screwed into the slideway 12 from top to bottom. A damping member 15 is arranged in the damping installation groove. In this embodiment, the damping member 15 is a spring. The left end of the spring is fixed to the left end of the damping installation groove, and the right end is connected to the support rod 13. The length of the support rod 13 on the right side of the carriage is greater than that of the support rod 13 on the left side to prevent the two side carriage doors from colliding when fully opened. From the above-described carriage door opening method, it can be seen that the slideway 12 and the upper pulling plate 4 jointly define the movement trajectory of the upper carriage door 1041. In addition, the present invention also provides a connecting member 16 to assist in the realization of this movement trajectory. In this embodiment, the connecting member 16 is a steel wire rope, and its two ends are respectively tied to the upper carriage door 1041 and the column 105.

[0057] To improve the airtightness of the carriage door, the present invention provides a first sealing strip 17 at each edge where the upper carriage door 1041 and the lower carriage door 1042 are in contact when the carriage door is closed. Specifically, the edges of the upper carriage door 1041 and the lower carriage door 1042 can be provided with mating step grooves, and the first sealing strip 17 is respectively installed in the step grooves, so that a good sealing effect can be achieved when the carriage door is closed. On the upper surface of the top plate 102, second sealing strips 19 are also provided on both side edges in the width direction of the carriage, and these sealing strips extend in the length direction of the carriage.

[0058] Repeatedly opening and closing the carriage door will cause the flexible connecting member 5 to deform. When the flexible connecting member 5 is directly connected to the lower carriage door 1042 or connected to it through a rigid rod, the elongation of the flexible connecting member 5 will cause the opening position of the carriage door to change, or it is not convenient for reinstallation during disassembly and repair. To overcome the above defects, refer to Figure 2In the enlarged view shown, the lower pull rod 2 in the present invention is composed of a main rod 21 and adjusting cylinders 22 located at both ends of the main rod 21. External threads are provided at both ends of the main rod 21, and internal threads are provided on the inner sides of the adjusting cylinders 22, so that they can be connected to the main rod 21 in a threaded connection manner. The flexible connecting member 5 and the lower compartment door 1042 are respectively connected to the adjusting cylinders 22 at both ends of the main rod 21. With the above settings, even if the flexible connecting member 5 is deformed due to long-term use, the overall length of the lower pull rod 2 can be adjusted to adapt to the deformation of the flexible connecting member 5, eliminate the connection error, and enable this mechanism to adapt to long-term use. The threads at both ends of the main rod 21 can be set in the reverse direction, so that the length can be directly adjusted by simply rotating the main rod 21. Alternatively, the threads at both ends of the main rod 21 can be set in the same direction, and the adjusting cylinder 22 can be rotated before installation to make the length of the lower pull rod 2 adapt to the flexible connecting member 5 and then install it.

[0059] In the driving mechanism 1, the first guiding member 8 and the second guiding member 9 are arranged on the column 105 at intervals from top to bottom. As Figure 2 shown in the embodiment, the flexible connecting member 5 sequentially bypasses the second guiding member 9, the first guiding member 8, and the support column 6 from the left side, and finally is connected to the upper pull plate 4. In the installed state, both of these guiding members are located on the same side of the flexible connecting member 5 (i.e., the outer side relative to the carriage). The hinge point of the upper pull plate 4 and the column 105 is located between the first guiding member 8 and the second guiding member 9. In this embodiment, the flexible connecting member 5 and the two guiding members form an open driving system. In such a driving system, the flexible connecting member 5 is a chain, and the two guiding members are sprockets. The chain drive makes the opening and closing process of the compartment door strictly follow the chain links, which can not only achieve high-precision opening and closing of the compartment door, but also be more stable. When the chain is connected to the mounting plate 20, it is connected to the pin in the through hole at the lower end of the mounting plate 20 through two parallel connecting plates 24 (see Figure 5 ). A number of spacer plates are also provided between the two connecting plates 24 to limit the distance between them. According to the concept of the present invention, the flexible connecting member 5 can also be a steel wire rope. At this time, the two guiding members are pulleys. This structure is similar to the cooperation of the chain and the sprockets, but the structure is relatively simple and the design difficulty is low. At the same time, in this embodiment, the two guiding members can also be cylindrical cylinders or columns, so as to form a fixed setting, and this design is more concise and has a lower cost.

[0060] Since during the opening or closing process of the compartment door by the driving mechanism 1, the angle between the upper part of the flexible connecting member 5 and the upper pull plate 4 will change, and then it will be stuck and unable to open or close the compartment door. Therefore, the mounting plate 20 is provided in this embodiment. The mounting plate 20 is a long strip-shaped flat plate with semicircles at both ends, and through holes are respectively provided at both ends of the mounting plate 20. During the opening or closing process of the compartment door, the mounting plate 20 swings accordingly, so as to avoid the mechanism being stuck during the movement process.

[0061] InFigure 3 and Figure 4 In the illustrated embodiment, a first limiting sleeve 25 and a second limiting sleeve 26 are provided in cooperation with the mounting plate 20 to limit the swing angle of the mounting plate 20. The structure of the second limiting sleeve 26 is the same as that of the first limiting sleeve 25. Only in this embodiment, the thickness of the second limiting sleeve 26 is less than that of the first limiting sleeve 25. Therefore, for the sake of simplicity, only Figure 3 shows an isometric view of the first limiting sleeve 25. As Figure 4 shown, the first limiting sleeve 25 and the second limiting sleeve 26 are located between the mounting plate 20 and the upper pulling plate 4 and are respectively welded to the opposite surfaces of the two. Through holes extending along their central axes are provided in the centers of the two limiting sleeves, so that they can be sleeved on the support column 6. In this embodiment, the support column 6 is a pin, which sequentially passes through the through holes at one end of the upper pulling plate 4, the second limiting sleeve 26, the first limiting sleeve 25, and the mounting plate 20 from the left. An external thread is provided at one end of the support column 6 away from the upper pulling plate 4, and a nut can be connected to limit the upper pulling plate 4, the two limiting sleeves, and the mounting plate 20. First limiting protrusions 25a and second limiting protrusions 26a are respectively provided on the opposite surfaces of the first limiting sleeve 25 and the second limiting sleeve 26. The limiting protrusions are arranged at intervals along the central axis of the limiting sleeve to form a toothed structure. In Figure 4 the illustrated assembled state, the first limiting protrusion 25a is located between two adjacent second limiting protrusions 26a, forming an interleaved arrangement. After the mounting plate 20 rotates through a certain angle, the two kinds of limiting protrusions abut against each other to prevent the mounting plate 20 from further rotating. In order to make the mounting plate 20 rotate smoothly, lubricating oil (grease) can be applied at the two limiting protrusions. The change range of the included angle between the symmetry center line of the mounting plate 20 and the symmetry center line of the upper pulling plate 4 is between 2° and 3°. The flexible connecting member 5 bypasses the limiting sleeve from above and is installed at the through hole at the lower end of the mounting plate 20, so as to be indirectly connected to the upper pulling plate 4.

[0062] Figure 6 is a schematic structural diagram of a semi-trailer showing an embodiment according to the present invention. As Figure 6 shown, the semi-trailer of the present invention includes a carriage 10 and a running system 11. Among them, the carriage 10 includes a bottom plate 101, a top plate 102, a rear door 103, a compartment door assembly, and columns 105. Figure 6 In, the front of the carriage 10 is on the left side and the rear of the carriage 10 is on the right side. The columns 105 are supported between the bottom plate 101 and the top plate 102, and three columns are arranged at intervals along the length direction of the carriage 10 (i.e., Figure 6 the horizontal direction in), and three columns are also symmetrically arranged on the opposite side. In this way, the arrangement of the columns 105 divides the entire carriage 10 into two spaces along its length direction. The compartment door assembly includes an upper compartment door 1041 and a lower compartment door 1042, and these two compartment doors cooperate with the driving mechanism 1 of the present invention described above to jointly realize the opening and closing actions of the doors.

[0063] In summary, in the present invention, the carriage 10 is divided into two spaces by the vertical columns 105, and a set of door assemblies is provided on each side of each space. That is, there are a total of four sets of door assemblies on the carriage, which are respectively located on both sides in the width direction of the carriage 1, and each set is located between two adjacent vertical columns 105. The door assemblies are each provided with a driving mechanism 1 of the present invention at both the left and right ends in Figure 6 , so that each set of door assemblies can perform independent opening and closing actions. As Figure 6 shown, a set of driving mechanism 1 is provided on each side of the middle vertical column 105, and a set of driving mechanism 1 is provided on the side where the left and right vertical columns 105 face each other. In this way, the semi-trailer of the present invention has a total of eight sets of driving mechanisms 1, and each set of driving mechanisms 1 corresponds to and matches a sliding structure (including a slideway installation groove, a slideway, a sliding body, and a support rod) and a damping structure (including a damping installation groove, a spring), and the two opposite sets of driving mechanisms 1 are staggered from each other to avoid interference. For example, the lengths of the upper doors 1041 in the door assemblies on both sides of the carriage 10 are set to be different, and the distances between the driving mechanisms 1 in the door assemblies on both sides are also different. In addition, a door lock 1043 is provided on the lower door 1042 for locking when the door is closed. The running system 11 includes a vehicle frame 111 and a wheel set 112, wherein the vehicle frame 111 is installed on the bottom plate 101, and the wheel set 112 is installed on the vehicle frame 111. The rear door 103 is also a structure that can be opened and closed.

[0064] As set above, when opening the door, the operator flips down the lower door 1042, thereby driving the lower pull rod 2 to move downward, and then pulling the flexible connecting member 5 connected thereto to move downward. During the movement of the flexible connecting member 5, it will pull the upper pull plate 4 to rotate around the hinge point, and drive the upper door 1041 to gradually move upward along a specified trajectory. At this time, the support rod 13 pushes the sliding body 14 to move leftward until the sliding body 14 hits the limit member 18 (i.e., the set screw) at the left end in the slideway 12. In the present invention, the spring (i.e., the damping member 15) is in a relaxed state when the door is closed. Therefore, during the leftward movement of the sliding body 14, the spring will give the support rod 13 a leftward pulling force, thereby assisting the door opening action and achieving the effect of saving effort. When the sliding body 14 passes through the approximate center position of the slideway 12, the spring will be in a gradually compressed state, so it can give the support rod 13 a rightward pushing force, thereby playing a buffering role and reducing the impact when opening the door. When closing the door, the operator can flip up the lower door 1042. At this time, relying on the self-weight of the upper door 1041 and the rightward pushing force given by the spring to the support rod 13, the upper door 1041 will automatically move downward along the original trajectory gradually and finally engage with the lower door 1042 to complete the door closing. During the entire door closing process, the sliding body 14 moves rightward. After passing through the approximate center position of the slideway 12, it will be subjected to a leftward pulling force from the spring, which also plays a buffering role to prevent excessive impact when closing the door.

[0065] The above is only one embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A driving mechanism (1) for opening and closing the carriage door of a truck, including an upper pulling plate (4), characterized in that, It further includes a flexible connecting member (5) with one end connected to the upper pulling plate (4) and a support column (6) arranged on the upper pulling plate (4); It further includes a mounting plate (20), a first limiting sleeve (25) and a second limiting sleeve (26) sleeved on the support column (6); The first limiting sleeve (25) and the second limiting sleeve (26) are located between the mounting plate (20) and the upper pulling plate (4) and are respectively fixedly connected to the two; On the faces of the first limiting sleeve (25) and the second limiting sleeve (26) facing each other, first limiting protrusions (25a) and second limiting protrusions (26a) arranged at annular intervals along their central axes are respectively provided; The first limiting protrusions (25a) and the second limiting protrusions (26a) are arranged alternately; The flexible connecting member (5) is connected to one end of the mounting plate (20) away from the first limiting sleeve (25); During the process of opening or closing the carriage door, the mounting plate (20) swings by a fixed angle under the traction of the flexible connecting member (5); It further includes a lower pull rod (2), and the lower pull rod (2) includes a main rod (21) and adjusting cylinders (22) arranged at both ends of the main rod (21), and one of the two adjusting cylinders (22) is connected to the flexible connecting member (5); External threads are provided at both ends of the main rod (21), and internal threads corresponding to the external threads on the main rod (21) are provided on the adjusting cylinder (22).

2. The drive mechanism (1) according to claim 1, characterized in that, The included angle between the symmetry center line of the mounting plate (20) and the symmetry center line of the upper pulling plate (4) is 2° - 3°.

3. The drive mechanism (1) according to any one of claims 1-2, characterized in that, It further includes a first guiding member (8) and a second guiding member (9).

4. The drive mechanism (1) according to claim 3, characterized in that, The flexible connecting member (5) is a chain, and the first guiding member (8) and the second guiding member (9) are sprockets; Two parallel connecting plates (24) are provided at one end of the flexible connecting member (5) connected to the upper pulling plate (4).

5. The drive mechanism (1) according to claim 3, characterized in that, The flexible connecting member (5) is a steel wire rope, and the first guiding member (8) and the second guiding member (9) are pulleys or cylindrical tubes / columns.

6. A carriage (10) using the drive mechanism (1) according to any one of claims 3-5, comprising a bottom plate (101), a top plate (102), a rear door (103), a door assembly including an upper door (1041) and a lower door (1042), and columns (105) supported between the bottom plate (101) and the top plate (102), characterized in that, Both ends of the upper pulling plate (4) are respectively hinged to the upper carriage door (1041) and the column (105), and the flexible connecting member (5) is respectively connected to the upper pulling plate (4) and the lower carriage door (1042).

7. The carriage (10) according to claim 6, characterized in that, The adjusting cylinder (22) at one end of the lower pull rod (2) is hinged to the lower carriage door (1042), and the adjusting cylinder (22) at the other end is connected to the flexible connecting member (5).

8. The carriage (10) according to claim 6, characterized in that, The first guiding member (8) and the second guiding member (9) are arranged alternately from top to bottom on the column (105), and the two and the support column (6) are located on the same side of the flexible connecting member (5); The hinge point between the upper pulling plate (4) and the column (105) is located between the first guiding member (8) and the second guiding member (9).

9. The carriage (10) according to claim 6, characterized in that, The carriage door assemblies are symmetrically arranged on both sides of the carriage (10).

10. The carriage (10) according to claim 9, characterized in that, Sliding rail installation grooves and damping installation grooves extending along the width direction of the carriage (10) and communicating with each other are respectively provided on the upper and lower surfaces of the top plate (102).

11. The carriage (10) according to claim 10, characterized in that, It further includes a slideway (12) disposed in the slideway installation groove, a support rod (13) with one end connected to the upper compartment door (1041), and a sliding body (14) located at the other end of the support rod (13), and the sliding body (14) is a pulley; A limiting member (18) is provided in the slideway (12), and the limiting member (18) is a setscrew.

12. The carriage (10) according to claim 11, characterized in that, The length of the support rod (13) on one side of the carriage (10) is greater than that of the support rod (13) on the other side.

13. The carriage (10) according to claim 12, characterized in that, It further includes a damping member (15) disposed in the damping installation groove, and the damping member (15) is a spring.

14. The carriage (10) according to claim 13, characterized in that, One end of the damping member (15) is fixed to the end of the damping installation groove, and the other end is connected to the support rod (13).

15. The carriage (10) according to claim 6, characterized in that, It further includes a connecting member (16) with one end connected to the upper compartment door (1041) and the other end connected to the column (105), and the connecting member (16) is a steel wire rope.

16. The carriage (10) according to claim 6, characterized in that, A first sealing strip (17) is provided on each of the edges where the upper compartment door (1041) and the lower compartment door (1042) meet when the compartment door is closed; A second sealing strip (19) is provided on the upper surface of the top plate (102) along both sides of the carriage (10).

17. The carriage (10) according to claim 6, characterized in that, A compartment door lock (1043) is provided on the lower compartment door (1042).

18. A semi-trailer using the carriage (10) according to any one of claims 6-17, characterized in that, It includes a traveling system (11) located at the bottom of the carriage (10); The traveling system (11) includes a vehicle frame (111) installed on the bottom plate (101) and a wheel set (112) installed on the vehicle frame (111).

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