A grain transport vehicle side door opening structure and a grain transport vehicle

Abstract

The application discloses a grain transport vehicle side door opening structure and a grain transport vehicle. The side door opening structure comprises a pair of side doors symmetrically arranged between a front vertical column of a vehicle compartment and a middle vertical column of the vehicle compartment and between the middle vertical column of the vehicle compartment and a rear vertical column of the vehicle compartment, a pair of side door locking mechanisms and a pair of spring resistance mechanisms symmetrically arranged on the front vertical column of the vehicle compartment and the rear vertical column of the vehicle compartment, a pair of door lock automatic return mechanisms symmetrically arranged on the middle vertical column of the vehicle compartment and a pair of side door lock rods symmetrically arranged on the two side doors. The grain transport vehicle comprises the side door opening structure. The application has the advantages that the extension size of the unloading platform is widened, the grain is prevented from falling into the chassis, the opening and closing degree of the door plate during unloading is increased, the unloading speed is increased, and the operator is prevented from being hurt by the side door during manual operation.

Description

Technical Field

[0001] This invention relates to the field of grain transport vehicles, specifically to a side door opening structure for a grain transport vehicle and the grain transport vehicle itself. Background Technology

[0002] Currently, most grain transport vehicles on the market use either side-opening doors or bottom-opening doors, and both methods have certain drawbacks. The side-opening door design has the disadvantage that during unloading, the unloaded grain tends to pile up around the chassis and tires, affecting vehicle movement and requiring manual cleaning, which is time-consuming and labor-intensive. The bottom-opening door design has the disadvantage that, without a power-assisted spring, it requires two adults to close the side door, making operation inconvenient. Summary of the Invention

[0003] The purpose of this invention is to provide a side door opening structure for a grain transport vehicle and a grain transport vehicle in order to overcome the problems existing in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A side door opening structure for a grain transport vehicle includes a pair of side doors symmetrically arranged between the front pillar and the middle pillar of the vehicle body and between the middle pillar and the rear pillar of the vehicle body, a pair of side door locking mechanisms and a pair of spring resistance mechanisms symmetrically arranged on the front pillar and the rear pillar of the vehicle body, a pair of door lock automatic return mechanisms symmetrically arranged on both sides of the middle pillar of the vehicle body, and a pair of side door lock rods symmetrically arranged on the two side doors.

[0006] Each side door comprises an upper side door panel and a lower side door panel. The upper end of each upper side door panel is hinged to the upper fixed plate of the side door of the grain transport vehicle, and the lower end is locked to the corresponding lower side door panel through a side door locking mechanism, an automatic door lock return mechanism, and a side door locking rod. The lower end of each lower side door panel is hinged to the floor of the vehicle body. The two ends of each side door locking rod are respectively locked to a side door locking mechanism and an automatic door lock return mechanism. One end of each spring resistance mechanism is connected to the corresponding front or rear pillar of the vehicle body, and the other end is connected to the lower side door panel of the corresponding side door.

[0007] Furthermore, each of the side door locking mechanisms includes a handle assembly and a linkage assembly, and one end of each linkage assembly is hinged to the corresponding handle assembly, and the other end is locked to the corresponding side door locking rod.

[0008] Each handle assembly includes a handle safety lock, a handle rod, a first screw, a first connecting plate, a second connecting plate, a first pin, a first support pin, and a second support pin. One end of the first connecting plate and the second connecting plate are fitted together and connected to the handle rod via the first screw. The other ends are separated and respectively fitted onto the first and second support pins. Both the first and second support pins are fixedly connected to their corresponding front or rear pillars of the carriage. The two ends of the first pin pass through the middle of the first and second connecting plates, respectively. The handle safety lock is fixed to the front or rear pillar of the carriage.

[0009] Each of the connecting rod assemblies includes a first threaded sleeve, a first adjusting screw, a second threaded sleeve, a second adjusting screw, a first adjusting nut, a second pin, a first connecting rod plate, a second connecting rod plate, a first bushing, a second bushing, and a first coupling. One end of the first adjusting screw is connected to the first pin in the handle assembly via the first threaded sleeve, and the other end is connected to the second adjusting screw via the first adjusting nut. The second adjusting screw is connected to the second pin via the second threaded sleeve. The two ends of the second pin are respectively passed through the first connecting rod plate and the second connecting rod plate. The first connecting rod plate and the second connecting rod plate are respectively sleeved on the first coupling. The first bushing and the second bushing are respectively located on the outside of the first connecting rod plate and the second connecting rod plate, and are respectively sleeved on the two ends of the first coupling. A first coupling recess is also provided at the end of the first bushing away from the first coupling for a concave-convex fitting connection with the side door lock rod.

[0010] Furthermore, each of the aforementioned automatic door lock return mechanisms includes a second coupling, a second coupling recess, a third bushing, a second coupling support tube, a first spring pull plate, a second spring pull plate, and a return spring. The second coupling passes through the third bushing, with one end connected to the second coupling recess and the other end connected to the first spring pull plate via a bolt. The third bushing passes through the second coupling support tube. The other end of the first spring pull plate is connected to the second spring pull plate via the return spring. The other end of the second spring pull plate is connected to the central column of the vehicle body. The second coupling support tube is fixed to the central column of the vehicle body via a third pin.

[0011] Furthermore, each of the side door lock rods includes a rotating rod, and at both ends of the rotating rod is a rotating rod coupling protrusion for locking and engaging with the side door locking mechanism and the door lock automatic return mechanism. At both ends of the rotating rod is a rotating rod retaining ring for fixing the rotating rod to the upper side door panel. Several rotating rod locking plates are also provided on the outer wall of the rotating rod along the axial direction.

[0012] Furthermore, each of the aforementioned spring resistance mechanisms includes a spring pull plate, two tension springs, a spring hanger plate, a second adjusting nut, a third adjusting screw, a fourth adjusting screw, a third threaded sleeve, and a fourth pin. One end of the spring pull plate is connected to the lower door panel, and the other end is connected to the spring hanger plate via the two tension springs. The spring hanger plate is connected to the third adjusting screw, and the third adjusting screw is connected to the fourth adjusting screw via the second adjusting nut. The fourth adjusting screw is connected to the third threaded sleeve, and the third threaded sleeve is sleeved on the fourth pin and supported on the front or rear pillar of the carriage.

[0013] Furthermore, a safety latch is provided at each end of each of the lower door panels.

[0014] Furthermore, a latch tube buckle is provided at each end of each of the lower door panels.

[0015] Furthermore, several lock plates are also provided on the upper side of each of the lower door panels.

[0016] Furthermore, several rope hooks are also provided on the underside of each of the lower door panels.

[0017] A grain transport vehicle includes the aforementioned grain transport vehicle side door opening structure.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] 1) The lower door panel adopts a bottom opening type. After opening, it is flush with the floor of the carriage under the pull of the limit rope, which widens the outward extension of the unloading platform and prevents the grain from spilling into the chassis.

[0020] 2) The upper side panel adopts an upward opening design, which increases the opening and closing range of the door panel during unloading and helps to speed up the unloading process;

[0021] 3) The side door locking mechanism is located at both ends of the side door of the carriage, which effectively prevents injury to the operator from the side door during manual operation;

[0022] 4) The lower door panel is equipped with an assistant spring, so that only one adult male is needed to close the lower door, making the operation extremely convenient. Attached Figure Description

[0023] Figure 1 This is a front view of an embodiment of the side door opening structure of the grain transport vehicle of the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of node M in the embodiment;

[0025] Figure 3 for Figure 1 Enlarged view of node N in the embodiment;

[0026] Figure 4 for Figure 1 Front view of the handle assembly of the side door locking mechanism in the embodiment;

[0027] Figure 5 for Figure 1 Front view of the linkage assembly of the side door locking mechanism in the embodiment;

[0028] Figure 6 for Figure 1 Assembly diagram of the upright column and automatic door lock return mechanism in the embodiment;

[0029] Figure 7 for Figure 6 Sectional view of AA;

[0030] Figure 8 for Figure 6 BB section view;

[0031] Figure 9 for Figure 8 Enlarged view of the Q node;

[0032] Figure 10 for Figure 1 Front view of the automatic door lock return mechanism in the embodiment;

[0033] Figure 11 for Figure 10 Top view of the automatic return mechanism of the middle door lock;

[0034] Figure 12 for Figure 10 Left view of the automatic return mechanism of the middle door lock;

[0035] Figure 13 for Figure 1 A perspective view of the safety latch in the embodiment;

[0036] Figure 14 for Figure 1 Front view of the side door lock rod in the embodiment;

[0037] Figure 15 for Figure 1 Front view of the spring resistance mechanism in the embodiment;

[0038] Figure 16 for Figure 1 Front view of the lower door panel in the embodiment;

[0039] Figure 17 for Figure 1 A perspective view of the lower side door panel in the embodiment;

[0040] Explanation of reference numerals in the attached drawings: 1. Front pillar of the carriage; 2. Middle pillar of the carriage; 3. Rear pillar of the carriage; 4. Side door; 41. Upper side door panel; 42. Lower side door panel; 5. Side door locking mechanism; 51. Handle assembly; 51a. Handle safety lock; 51b. Handle lever; 51c. First screw; 51d. First connecting plate; 51e. Second connecting plate; 51f. First pin; 51g. First support pin; 51h. Second support pin; 52. Connecting rod assembly; 52a. First threaded sleeve; 52b. First adjusting screw; 52c. Second threaded sleeve; 52d. Second adjusting screw; 52e. First adjusting nut; 52f. Second pin; 52g. First connecting rod plate; 52h. Second connecting rod plate; 52i. First bushing; 52j. Second bushing; 52k. First coupling; 52m. 6. Automatic door lock return mechanism; 61. Second coupling; 62. Second coupling recess; 63. Third bushing; 64. Second coupling support tube; 65. First spring pull plate; 66. Second spring pull plate; 67. Return spring; 68. Bolt; 69. Third pin; 7. Side door lock rod; 71. Rotating rod; 72. Rotating rod coupling protrusion; 73. Rotating rod retaining ring; 74. Rotating rod locking plate; 8. Spring resistance mechanism; 81. Spring pull plate; 82. Tension spring; 83. Spring hanging plate; 84. Second adjusting nut; 85. Third adjusting screw; 86. Fourth adjusting screw; 87. Third screw sleeve; 88. Fourth pin; 9. Safety pin; 10. Pin tube buckle; 20. Lock plate; 30. Rope hook; 40. Upper hinge seat; 50. Lower hinge seat. Detailed Implementation

[0041] To make the technical means, creative features, objectives and effects of this invention easier to understand, the following description, in conjunction with the accompanying drawings and specific embodiments, further explains how this invention is implemented.

[0042] See Figures 1 to 3 As shown, the present invention provides a side door opening structure for a grain transport vehicle, comprising a pair of side doors 4 symmetrically disposed between the front pillar 1 and the middle pillar 2 of the vehicle body and between the middle pillar 2 and the rear pillar 3 of the vehicle body, a pair of side door locking mechanisms 5 symmetrically disposed on the front pillar 1 and the rear pillar 3 of the vehicle body, a pair of spring resistance mechanisms 8, a pair of door lock automatic return mechanisms 6 symmetrically disposed on both sides of the middle pillar 2 of the vehicle body, and a pair of side door lock rods 7 symmetrically disposed on the two side doors 4.

[0043] Each side door 4 includes an upper side door panel 41 and a lower side door panel 42. The upper end of each upper side door panel 41 is hinged to the upper fixed plate of the side door of the grain transport vehicle through several upper hinge seats 40. The lower end of each upper side door panel 41 is locked to the corresponding lower side door panel 42 through a side door locking mechanism 5, an automatic door lock return mechanism 6 and a side door lock rod 7. The lower end of each lower side door panel 42 is hinged to the bottom plate of the vehicle through several lower hinge seats 50. The two ends of each side door lock rod 7 are locked to a side door locking mechanism 5 and an automatic door lock return mechanism 6 respectively. One end of each spring resistance mechanism 8 is connected to the corresponding front column 1 or rear column 3 of the vehicle, and the other end is connected to the lower side door panel 42 of the corresponding side door 4.

[0044] The side door locking mechanism 5 is used to control the rotation of the side door lock rod 7 and to connect with the side door lock rod 7 to open or close the side door 4. The door lock automatic return mechanism 6 is used in conjunction with the side door locking mechanism 5 to lock the side door lock rod 7. The spring resistance mechanism 8 is used to ensure that the lower side door panel 42 opens slowly and provides assistance when closing, making it easy to lift and close the lower side door panel 42.

[0045] Specifically, as an embodiment of the side door locking mechanism 5 in the side door opening structure of the grain transport vehicle of the present invention: see [reference] Figure 3 As shown, each side door locking mechanism 5 includes a handle assembly 51 and a linkage assembly 52, with one end of each linkage assembly 52 hinged to the corresponding handle assembly 51 and the other end locked to the corresponding side door locking rod 8.

[0046] More specifically, in this embodiment, see [reference] Figure 4 As shown, each handle assembly 51 includes a handle safety lock 51a, a handle rod 51b, a first screw 51c, a first connecting plate 51d, a second connecting plate 51e, a first pin 51f, a first support pin 51g, and a second support pin 51h. The first connecting plate 51d and the second connecting plate 51e are joined together at one end and connected to the handle rod 51b by the first screw 51c. Their other ends are separated and respectively fitted onto the first support pin 51g and the second support pin 51h. The first support pin 51g and the second support pin 51h are both fixedly connected to their corresponding front pillar 1 or rear pillar 3 of the carriage. The two ends of the first pin 51f pass through the middle of the first connecting plate 51d and the second connecting plate 51e, respectively. The handle safety lock 51a is fixedly connected to its corresponding front pillar 1 or rear pillar 3 of the carriage and is used to lock the handle rod 51b.

[0047] More specifically, in this embodiment, see [reference] Figure 5 As shown, each connecting rod assembly 52 includes a first threaded sleeve 52a, a first adjusting screw 52b, a second threaded sleeve 52c, a second adjusting screw 52d, a first adjusting nut 52e, a second pin 52f, a first connecting rod plate 52g, a second connecting rod plate 52h, a first bushing 52i, a second bushing 52j, and a first coupling 52k; wherein, one end of the first adjusting screw 52b is connected to the first pin 51f in the corresponding handle assembly 51 via the first threaded sleeve 52a, and the other end is connected to the second adjusting screw 52d via the first adjusting nut 52e, and the second adjusting nut 52k... The screw 52d is connected to the second pin 52f via the second screw sleeve 52c; the two ends of the second pin 52f are respectively passed through the first connecting rod piece 52g and the second connecting rod piece 52h; the first connecting rod piece 52g and the second connecting rod piece 52h are respectively sleeved on the first coupling 52k; the first bushing 52i and the second bushing 52j are respectively located on the outside of the first connecting rod piece 52g and the second connecting rod piece 52h, and are respectively sleeved on the two ends of the first coupling 52k; a first coupling recess 52m is also provided at the end of the first bushing 52i away from the first coupling 52k for a concave-convex fitting connection with the side door lock rod 8.

[0048] Specifically, as an embodiment of the automatic door lock return mechanism 6 in the side door opening structure of the grain transport vehicle of the present invention: see [reference] Figures 6 to 12 As shown, each door lock automatic return mechanism 6 includes a second coupling 61, a second coupling recess 62, a third bushing 63, a second coupling support tube 64, a first spring pull plate 65, a second spring pull plate 66, and a return spring 67. The second coupling 61 passes through the third bushing 63, with one end connected to the second coupling recess 62 and the other end connected to the first spring pull plate 65 by a bolt 68. The third bushing 63 passes through the second coupling support tube 64. The other end of the first spring pull plate 65 is connected to the second spring pull plate 66 by the return spring 67. The other end of the second spring pull plate 66 is connected to the central column 2 of the carriage. The second coupling support tube 64 is fixed to the central column 2 of the carriage by a third pin 69.

[0049] Specifically, as an embodiment of the side door locking rod 7 in the side door opening structure of the grain transport vehicle of the present invention: see [reference] Figure 14 As shown, each side door lock rod 7 includes a rotating rod 71. At both ends of the rotating rod 71, there is a rotating rod coupling protrusion 72 for engaging with the side door locking mechanism 5 and the door lock automatic return mechanism 6. At both ends of the rotating rod 71, there is also a rotating rod retaining ring 73 for fixing the rotating rod 71 to the upper side door panel 41. Several rotating rod locking plates 74 are also provided along the axial direction on the outer wall of the rotating rod 71.

[0050] Specifically, as an embodiment of the spring resistance mechanism 8 in the side door opening structure of the grain transport vehicle of the present invention: see [reference] Figure 15 As shown, each spring resistance mechanism 8 includes a spring pull plate 81, two tension springs 82, a spring hanging plate 83, a second adjusting nut 84, a third adjusting screw 85, a fourth adjusting screw 86, a third screw sleeve 87, and a fourth pin 88. One end of the spring pull plate 81 is connected to the lower door panel 42, and the other end is connected to the spring hanging plate 83 through the two tension springs 82. The spring hanging plate 83 is connected to the third adjusting screw 85. The third adjusting screw 85 is connected to the fourth adjusting screw 86 through the second adjusting nut 84. The fourth adjusting screw 86 is connected to the third screw sleeve 87. The third screw sleeve 87 is sleeved on the fourth pin 88 and supported on the front pillar 1 or the rear pillar 3 of the carriage.

[0051] Specifically, as an embodiment of the lower door panel 42 in the side door opening structure of the grain transport vehicle of the present invention: see [reference] Figure 13 , Figure 16 and Figure 17 As shown, a safety pin 9 is provided at both ends of each lower door panel 42; the function of this safety pin 9 is to lock the lower door panel 42 and prevent the lower door panel 42 from opening automatically.

[0052] Specifically, as an embodiment of the lower door panel 42 in the side door opening structure of the grain transport vehicle of the present invention: see [reference] Figure 16 and Figure 17 As shown, a latch tube buckle 30 is provided at both ends of each lower door panel 42; the function of this latch tube buckle 30 is to cooperate with the safety latch 9 to prevent the safety latch 9 from being pulled outward.

[0053] Specifically, as an embodiment of the lower door panel 42 in the side door opening structure of the grain transport vehicle of the present invention: see [reference] Figure 16 and Figure 17 As shown, several locking plates 20 are also provided on the upper side of each lower door panel 42 (i.e., the side opposite to the upper door panel 41); the function of these locking plates 20 is to match with several rotating rod locking pieces 74 on the side door locking rod 7, so as to lock the upper door panel 41.

[0054] Specifically, as an embodiment of the lower door panel 42 in the side door opening structure of the grain transport vehicle of the present invention: see [reference] Figure 16 and Figure 17 As shown, several rope hooks 30 are also provided on the lower side of each lower door panel 42; the function of these rope hooks 30 is to tighten the tarpaulin on the top of the carriage or to lock the ropes of the light and flammable goods loaded in the carriage.

[0055] The working principle of the side door opening structure of the grain transport vehicle of the present invention is as follows:

[0056] (i) When the side door needs to be opened, first manually turn the safety bolt 9 upward to the horizontal position and pull it outward to disengage it from the lower side door panel 42. Then, open the handle safety lock 51a of the handle assembly 51 in the side door locking mechanism 5 and push the handle rod 51b upward. During the upward pushing of the handle rod 51b, the side door lock rod 7 will rotate upward through the connecting rod assembly 52. ​​During the upward rotation of the side door lock rod 7, the rotating rod lock plate 74 on the side door lock rod 7 will rotate upward accordingly. At the same time, during the upward pushing of the handle rod 51b, the rotating rod coupling protrusions 72 at both ends of the side door lock rod 7 will rotate to a horizontal position with the first coupling concave head 52m in the side door locking mechanism 5 and the second coupling concave head 62 in the door lock automatic return mechanism 6. At this time, the upper side door panel 41 will be pushed outward by the squeezing action of the internal goods. As the upper door panel 41 opens outwards, the rotating locking plate 74 on the side door lock rod 7 disengages from the lower door panel 42. Simultaneously, the lower door panel 42 opens outwards under the pressure of the cargo inside. During the outward opening of the lower door panel 42, the force on the pair of spring resistance mechanisms 8 acting on the front pillar 1 and the rear pillar 3 of the cargo compartment increases, thereby slowing down the opening speed of the lower door panel 42. When the lower door panel 42 is opened to be parallel to the floor of the cargo compartment, the limiting zipper (not shown in the figure) installed on the lower door panel 42 will pull the lower door panel 42, preventing it from falling further. At this time, the lower door panel 42 can act as a widened unloading platform, preventing materials from falling under the chassis of the vehicle and blocking the tires and other vehicle accessories, thus causing driving difficulties.

[0057] When the lower end of the upper door panel 41 is opened outward by the lateral pressure of the internal cargo, the protruding head 72 of the rotating rod coupling on the side door lock rod 7 will completely disengage from the concave head 62 of the second coupling in the automatic door lock return mechanism 6. The concave head 62 of the second coupling will remain in its initial horizontal position under the action of the return spring 67 inside. In this way, when the carriage falls, after the upper door panel 41 returns to its original position, the protruding head 72 of the rotating rod coupling on the side door lock rod 7 can smoothly engage with the concave head 62 of the second coupling in the automatic door lock return mechanism 6.

[0058] (ii) When it is necessary to close the side door panel, close the upper side door panel 41 first, that is, let the upper side door panel 41 automatically return to its original position under its own weight, and make the first coupling concave head 52m in the side door locking mechanism 5 and the second coupling concave head 62 in the door lock automatic return mechanism 6 respectively engage with the rotating rod coupling protrusions 72 at both ends of the side door lock rod 7. If the rotating rod coupling protrusion 72 on the side door lock rod 7 does not match the first coupling concave head 52m in the side door locking mechanism 5 when the upper side door panel 41 returns to its original position, it can be resolved by... Adjust the handle rod 51b to engage the two parts. Because the second coupling concave head 62 of the automatic door lock return mechanism 6 remains engaged with the rotating rod coupling convex head 72 on the side door lock rod 7 under the action of the internal return spring 67, no adjustment to the automatic door lock return mechanism 6 is required when the upper door panel 41 returns to its original position. Then close the lower door panel 42 by first lifting the lower door panel 42 to fold it up and close it, and then inserting the two rods located at the upper end of the lower door panel 42. The safety latch 9 on the side is automatically lowered under its own weight, locking the lower door panel 42 to the front pillar 1, middle pillar 2, and rear pillar 3 of the carriage. Then, the handle rod 51b in the handle assembly 51 is pulled down, causing the linkage mechanism 52 connected to the handle assembly 51 to rotate the side door lock rod 7 downwards. This causes the first coupling concave head 52m on the linkage mechanism 52 to engage with the rotating rod coupling convex head 72 on the side door lock rod 7. As the side door lock rod 7 rotates downwards, the side door... The rotating locking plate 74 on the locking rod 7 will also rotate downwards until the rotating locking plate 74 presses against the locking plate 20 on the lower side door panel 42. At this time, the concave head 62 of the second coupling in the automatic door lock return mechanism 6 will engage with the convex head 82 of the rotating rod coupling on the side door lock rod 8, and form an angle with the tangential direction of the rotation of the upper side door panel 41, which prevents the upper door panel 41 from opening outwards. Finally, the handle safety lock plate 51a is closed to restrict the movement of the handle rod 51b, which prevents the side door lock rod 7 from rotating.

[0059] The present invention provides a grain transport vehicle, which includes the aforementioned grain transport vehicle side door opening structure, and the aforementioned grain transport vehicle side door opening structure is installed on the left or right side of the grain transport vehicle compartment.

[0060] Finally, it should be noted that the above description is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A side door opening structure for a grain transport vehicle, characterized in that: It includes a pair of side doors symmetrically located between the front pillar and the middle pillar of the carriage and between the middle pillar and the rear pillar of the carriage; a pair of side door locking mechanisms and a pair of spring resistance mechanisms symmetrically located on the front pillar and the rear pillar of the carriage; a pair of door lock automatic return mechanisms symmetrically located on the middle pillar of the carriage; and a pair of side door lock rods symmetrically located on the two side doors. Each side door comprises an upper side door panel and a lower side door panel. The upper end of each upper side door panel is hinged to the upper fixed plate of the side door of the grain transport vehicle, and the lower end is locked to the corresponding lower side door panel through a side door locking mechanism, an automatic door lock return mechanism, and a side door locking rod. The lower end of each lower side door panel is hinged to the floor of the vehicle body. The two ends of each side door locking rod are respectively locked to a side door locking mechanism and an automatic door lock return mechanism. One end of each spring resistance mechanism is connected to the corresponding front or rear pillar of the vehicle body, and the other end is connected to the lower side door panel of the corresponding side door. Each of the aforementioned side door locking mechanisms includes a handle assembly and a linkage assembly, with one end of each linkage assembly hinged to the corresponding handle assembly and the other end locked to the corresponding side door locking rod. Each handle assembly includes a handle safety lock, a handle rod, a first screw, a first connecting plate, a second connecting plate, a first pin, a first support pin, and a second support pin. The first connecting plate and the second connecting plate are joined together at one end and connected to the handle rod by the first screw, while their other ends are separated and respectively fitted onto the first and second support pins. The first and second support pins are fixedly connected to their corresponding front or rear pillars of the vehicle body. The two ends of the first pin pass through the middle of the first and second connecting plates, respectively. The handle safety lock is fixed to the front or rear pillar of the vehicle body. Each of the connecting rod assemblies includes a first threaded sleeve, a first adjusting screw, a second threaded sleeve, a second adjusting screw, a first adjusting nut, a second pin, a first connecting rod plate, a second connecting rod plate, a first bushing, a second bushing, and a first coupling. One end of the first adjusting screw is connected to the first pin in the handle assembly via the first threaded sleeve, and the other end is connected to the second adjusting screw via the first adjusting nut. The second adjusting screw is connected to the second pin via the second threaded sleeve. The two ends of the second pin are respectively passed through the first connecting rod plate and the second connecting rod plate. The first connecting rod plate and the second connecting rod plate are respectively sleeved on the first coupling. The first bushing and the second bushing are respectively located on the outside of the first connecting rod plate and the second connecting rod plate, and are respectively sleeved on the two ends of the first coupling.

2. The side door opening structure of the grain transport vehicle according to claim 1, characterized in that: Each of the aforementioned automatic door lock return mechanisms includes a second coupling, a second coupling recess, a third bushing, a second coupling support tube, a first spring tab, a second spring tab, and a return spring. The second coupling passes through the third bushing, with one end connected to the second coupling recess and the other end connected to the first spring tab via a bolt. The third bushing passes through the second coupling support tube. The other end of the first spring tab is connected to the second spring tab via the return spring. The other end of the second spring tab is connected to the central column of the vehicle body. The second coupling support tube is fixed to the central column of the vehicle body via a third pin.

3. The side door opening structure of the grain transport vehicle according to claim 1, characterized in that: Each of the side door lock rods includes a rotating rod. At both ends of the rotating rod, there is a rotating rod coupling protrusion for locking with the side door locking mechanism and the door lock automatic return mechanism. At both ends of the rotating rod, there is also a rotating rod retaining ring for fixing the rotating rod to the upper side door panel. Several rotating rod locking plates are also provided on the outer wall of the rotating rod along the axial direction.

4. The side door opening structure of the grain transport vehicle according to claim 1, characterized in that: Each of the aforementioned spring resistance mechanisms includes a spring pull plate, two tension springs, a spring hanger plate, a second adjusting nut, a third adjusting screw, a fourth adjusting screw, a third threaded sleeve, and a fourth pin. One end of the spring pull plate is connected to the lower door panel, and the other end is connected to the spring hanger plate via the two tension springs. The spring hanger plate is connected to the third adjusting screw, and the third adjusting screw is connected to the fourth adjusting screw via the second adjusting nut. The fourth adjusting screw is connected to the third threaded sleeve, and the third threaded sleeve is sleeved on the fourth pin and supported on the front or rear pillar of the carriage.

5. The side door opening structure of the grain transport vehicle according to claim 1, characterized in that: A safety latch is also provided at each end of each of the lower door panels.

6. The side door opening structure of the grain transport vehicle according to claim 1, characterized in that: Each of the lower door panels is also provided with a pin tube buckle at both ends.

7. The side door opening structure of the grain transport vehicle according to claim 1, characterized in that: Several lock plates are also provided on the upper side of each of the lower door panels.

8. The side door opening structure of the grain transport vehicle according to claim 1, characterized in that: Several rope hooks are also provided on the underside of each of the lower door panels.

9. A grain transport vehicle, characterized in that: The grain transport vehicle includes the side door opening structure as described in any one of claims 1 to 8.

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