A tracked carrier with a modular expandable cargo bed

Abstract

The application discloses a crawler transport vehicle with a modular expandable cargo compartment applied to the field of crawler vehicles, through a modular detachable cargo compartment structure and various transportation modes such as conventional transportation, full-sliding transportation and half-sliding transportation, the crawler transport vehicle can flexibly adjust the load bearing mode according to the hardness of the ground and the type of the material, when heavy objects are transported on hard ground, the conventional transportation mode is adopted, the cargo compartment is located on the frame and is supported by the frame, on soft ground such as mud, sand and snow, the cargo compartment can be rotated by 270 degrees and placed on the ground to form a new compartment body with the sliding plate, the material gravity is transferred from the frame to the ground, the pressure of the crawler on the ground is reduced, the pressure is dispersed through the large-area sliding plate, the sinking is reduced, the driving resistance is reduced, the passability and stability on the soft ground are improved, the problem that the crawler is seriously sunk and the transportation is affected due to the superposition of the self weight of the vehicle body and the weight of the material in the prior art is solved, and the applicability of the application is improved.

Description

Technical Field

[0001] This invention relates to the field of tracked vehicles, and particularly to a tracked transport vehicle with a modular, expandable cargo box. Background Technology

[0002] Tracked transport vehicles are special vehicles that use a tracked walking system. They are designed for complex terrains (such as swamps, snowfields, and mountains), have strong off-road capabilities and high load capacity, and are widely used in military, agriculture, mining and other fields.

[0003] For example, Chinese patent CN111776097B discloses an all-terrain mining explosion-proof double-section tracked transport vehicle with good shock absorption, enabling the vehicle to adapt to large bumps under various complex road conditions; it can distribute the pressure borne by the connecting shaft in the support roller assembly, extending the service life of the connecting shaft; another example is Chinese patent CN221214300U, which discloses a snow material transport vehicle, which creates a speed difference between the two second track components by separately controlling the drive motor, thereby controlling the movement direction of the whole vehicle together with the sled; yet another example is Chinese patent CN212828507U, which discloses a marshland grass transport device, whose advantages are: convenient transportation of grass, reducing the workload of farmers, and preventing the transport vehicle from sinking into the damp mud of the marshland.

[0004] Although tracked transporters have better passability and stability in mud, sand and snow by increasing the contact area and dispersing pressure compared to traditional wheeled vehicles, they still suffer from serious sinking when used on soft ground such as mud, sand and snow due to their own weight and the weight of the transported materials. This seriously affects the transport speed and stability. Summary of the Invention

[0005] The core of this invention lies in the fact that, through a modular and detachable cargo box structure and multiple transportation methods, the tracked transport vehicle can flexibly adjust its load-bearing mode according to the hardness of the ground and the type of material, significantly improving the passability, stability and transportation efficiency on soft ground, and solving the problem in the prior art where the tracks sink severely on soft ground due to the superposition of the vehicle's own weight and the weight of the material, thus affecting transportation.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A tracked transport vehicle with a modular expandable cargo box includes a tracked vehicle body. The tracked vehicle body includes a frame, a cargo box, a tail plate, and a first hydraulic cylinder. The tail plate is installed at the rear opening end of the cargo box and is rotatably connected to the frame. The first hydraulic cylinder is installed on the frame and located under the cargo box. The tracked vehicle body also includes a rear end plate, a second hydraulic cylinder, and a sliding plate. The upper end of the rear end plate is fixedly connected to the lower rear end of the frame. The cylinder of the second hydraulic cylinder is fixedly connected to the frame, and the telescopic end of the second hydraulic cylinder extends obliquely upward in a direction away from the front end of the tracked vehicle body. The rear end plate has an oblique hole for the second hydraulic cylinder to pass through. The length and width of the sliding plate are matched with the length and width of the carriage, and the sliding plate and the carriage are detachably connected. The carriage includes a U-shaped body and a floor plate, and the U-shaped body and the floor plate are also detachably connected. The tail plate includes a moving plate and a rotating plate that are slidably connected. One end of the rotating plate is rotatably connected to the frame. The U-shaped body and the rotating plate are connected by a rod assembly. In the initial state, the carriage is located at the upper end of the frame. After the tail plate drives the carriage to rotate 270°, the carriage sits on the ground.

[0008] Furthermore, the insertion rod assembly includes a screw, a pair of nuts, and multiple hollow plates. The multiple hollow plates are respectively fixedly connected to the U-shaped box and the rotating plate. The screw is inserted into the interior of the multiple hollow plates, and the pair of nuts are respectively threaded to the upper and lower ends of the screw.

[0009] Furthermore, after the carriage rotates 270° with the tailgate, the distance between the lower end of the carriage and the ground is less than or equal to the thickness of the sliding plate.

[0010] Furthermore, a T-shaped slider is fixedly connected to one end of the moving plate near the rotating plate, and a T-shaped groove is provided on one end of the rotating plate near the moving plate, with the T-shaped slider slidably connected inside the T-shaped groove.

[0011] Furthermore, the sides of the U-shaped body, the bottom plate, the moving plate, and the sliding plate are all fixedly connected with multiple evenly distributed perforated seats. Some of the perforated seats on the U-shaped body correspond one-to-one with the multiple perforated seats on the bottom plate and are connected by bolt assemblies. Other perforated seats on the U-shaped body and the perforated seats on the moving plate correspond one-to-one with the multiple perforated seats on the sliding plate and are connected by bolt assemblies.

[0012] Furthermore, the U-shaped body includes a pair of stacked half-body sections. A pair of horizontal plates are fixedly connected to the side ends of the upper half-body section. A pair of third hydraulic cylinders are fixedly connected to the upper end of the frame. The pair of third hydraulic cylinders are located on the lower side of the pair of horizontal plates. The telescopic ends of the third hydraulic cylinders extend obliquely upward in a direction away from the front end of the tracked vehicle body.

[0013] Furthermore, multiple evenly distributed perforated seats are fixedly connected to the side edges of the two half-body sections that are close to each other, and the perforated seats that are in corresponding positions are also connected by bolt assemblies.

[0014] Furthermore, the lower half of the compartment is connected to the bottom plate, and the hollow plate is fixedly connected to the upper half of the compartment. After the upper half of the compartment rotates 270° with the tail plate, it is located on the ground and connected to the sliding plate.

[0015] A tracked transport vehicle with a modular, expandable cargo box, the method of using which includes the following steps: Step 1, Conventional Transportation: The cargo box is located at the top of the chassis. After the materials are loaded into the cargo box, the weight of the cargo box and materials is borne by the chassis. The tracked vehicle body is then started to realize the material transportation. Step 2, Full Slide Transport: For soft transport ground, before use, place a slide plate on the ground at the rear of the tracked vehicle body, and then activate the first and second hydraulic cylinders. The first hydraulic cylinder extends to push the carriage and tail plate to rotate, and the second hydraulic cylinder extends to support the carriage and tail plate during the rotation. After the second hydraulic cylinder supports the tail plate, it slowly retracts to guide the carriage and tail plate to continue rotating under their own weight until they have completed a 270° rotation. At this time, the carriage is located on the upper side of the slide plate. Adjust the height of the carriage to make it contact the sliding plate, and connect the U-shaped carriage and the sliding plate, as well as the moving plate and the sliding plate, through bolt assemblies; Remove the bottom plate, then load materials into the U-shaped box, start the tracked vehicle body, and drive the U-shaped box and sliding plate loaded with materials to slide on the soft ground; Step 3, Semi-slip-steer transport: For soft transport ground, before use, disconnect the connection between a pair of half-boxes, place the skid plate on the ground at the rear of the tracked vehicle body, and start the third and second hydraulic cylinders. The extension of the third hydraulic cylinder can push the tail plate and the upper half-box to rotate. The extension of the second hydraulic cylinder is used to support the half-box and tail plate during the rotation. After the second hydraulic cylinder supports the tail plate, it slowly retracts to guide the half-box and tail plate to continue rotating under their own weight until they complete a 270° rotation. At this time, the half-box is located on the upper side of the skid plate. Adjust the height of the semi-truck body to make it contact the sliding plate, and connect the semi-truck body and the sliding plate, as well as the moving plate and the sliding plate, through bolt assemblies; Lightweight materials are loaded into the upper half of the chassis, while heavy materials are loaded into the lower half. The tracked vehicle body is then started to transport both materials simultaneously.

[0016] Compared with the prior art, the advantages of this invention are: (1) This solution can adapt to different ground conditions, improve passability and stability. When transporting heavy objects on hard surfaces, the conventional transport mode is adopted (the cargo box is located on the frame and is supported by the frame). On soft ground such as mud, sand, and snow, the cargo box can be rotated 270° backward and placed on the ground to form a new box with the sliding plate. The weight of the material is transferred from the frame to the ground, reducing the pressure of the track on the ground. The pressure is dispersed by the large-area sliding plate to reduce sinking, thereby reducing driving resistance and improving passability and stability on soft ground.

[0017] (2) The U-shaped box is divided into two halves, the upper half can be rotated to the ground and connected to the sliding plate for holding heavy materials; the lower half remains on the frame for holding light materials, thus realizing the simultaneous transportation of light and heavy materials without significantly increasing track sinking. Attached Figure Description

[0018] Figure 1 This is a three-dimensional representation of the normal use in the first embodiment of the present invention. Figure 1 ; Figure 2 This is a perspective view of the rear port of the carriage when it is opened in the first embodiment of the present invention; Figure 3 This is a perspective view of the rotating carriage in the first embodiment of the present invention; Figure 4 This is a schematic diagram of the side structure of the carriage when it is rotated in the first embodiment of the present invention; Figure 5 This is a perspective view of the carriage after it has completed a 270° rotation according to the first embodiment of the present invention; Figure 6 This is a perspective view of the disassembly of the base plate in the first embodiment of the present invention; Figure 7 This is a schematic diagram of the side structure of the carriage after it has completed a 270° rotation in the first embodiment of the present invention; Figure 8 This is a partial exploded view of the first embodiment of the present invention; Figure 9 This is a perspective view of the carriage after it has been rotated and connected to the sliding plate in the first embodiment of the present invention; Figure 10 This is a three-dimensional representation of the normal use in the first embodiment of the present invention. Figure 2 ; Figure 11 This is a perspective view of the second embodiment of the present invention under normal use; Figure 12 This is a perspective view of the rotating half-box in the second embodiment of the present invention; Figure 13 This is a perspective view of the half-box after rotation in the second embodiment of the present invention.

[0019] Explanation of the labels in the diagram: 1. Frame, 2. Carriage, 21. U-shaped body, 2101. Half-body, 2102. Horizontal plate, 22. Bottom plate, 3. Tail plate, 31. Moving plate, 3101. T-shaped slider, 32. Turning plate, 3201. T-shaped slide, 4. First hydraulic cylinder, 5. Hollow plate, 6. Rear end plate, 7. Second hydraulic cylinder, 8. Sliding plate, 9. Seat with holes, 10. Third hydraulic cylinder. Detailed Implementation

[0020] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0021] First implementation method: Please see Figures 1-3 A tracked transport vehicle with a modular expandable cargo box includes a tracked vehicle body, which comprises a frame 1, a cargo box 2, a tailgate 3, and a first hydraulic cylinder 4. The tailgate 3 is mounted on the rear opening of the cargo box 2 and is rotatably connected to the frame 1. The first hydraulic cylinder 4 is mounted on the frame 1 and located on the lower side of the cargo box 2. This structure is the basic component of existing tracked transport vehicles. During use, materials are loaded into the cargo box 2 for transportation. During unloading, the tailgate 3 is opened (e.g., ...). Figure 2 As shown), it then extends via the first hydraulic cylinder 4 (as shown). Figure 3 As shown, the front end of the carriage 2 is lifted upwards, causing it to gradually tilt. The material falls onto the ground through the rear opening of the carriage 2, thus completing the unloading operation. In addition, in this invention, the telescopic end of the first hydraulic cylinder 4 is not connected to the bottom of the carriage 2, but only contacts it during operation. By extending the first hydraulic cylinder 4, the carriage 2 carrying the material is pushed upwards to tilt it. When the first hydraulic cylinder 4 slowly retracts, the carriage 2, with a tilt angle not exceeding 90°, can automatically rotate downwards along its original path under its own gravity until it is placed flat on the upper part of the frame 1 again.

[0022] Please see Figure 1 , Figures 3-4 The tracked vehicle body also includes a rear end plate 6, a second hydraulic cylinder 7, and a sliding plate 8. The upper end of the rear end plate 6 is fixedly connected to the lower end of the rear of the frame 1. The cylinder of the second hydraulic cylinder 7 is fixedly connected to the frame 1, and the telescopic end of the second hydraulic cylinder 7 extends obliquely upward in a direction away from the front end of the tracked vehicle body. An oblique hole is provided on the rear end plate 6 for the second hydraulic cylinder 7 to move through. The length and width of the sliding plate 8 are matched with the length and width of the carriage 2, respectively, and the sliding plate 8 and the carriage 2 are detachably connected.

[0023] Please see Figures 4-6The carriage 2 includes a U-shaped body 21 and a floor 22, which are detachably connected. Initially, the carriage 2 is located on top of the frame 1, with the floor 22 in contact with the upper part of the frame 1. The U-shaped body 21 and the floor 22 are fixedly connected. The carriage 2 and the tail panel 3 form a box with an open top for easy loading of materials. When the tail panel 3 rotates the carriage 2 270°, the carriage 2 sits on the ground, as... Figure 6 As shown, the original upper opening of the carriage 2 is changed to face downward (hereinafter referred to as the lower opening end), and the bottom plate 22 is located on the upper side of the U-shaped body 21. At this time, the bottom plate 22 can be removed from the U-shaped body 21, and the lower opening end of the carriage 2 can be closed by the sliding plate 8, so that the U-shaped body 21, the tail plate 3 and the sliding plate 8 form a new box with an upper opening, which is used to hold the materials to be transported.

[0024] When the carriage 2 rotates 270° with the tailgate 3, the distance between the lower end of the carriage 2 and the ground is less than or equal to the thickness of the sliding plate 8, which facilitates the installation of the sliding plate 8 and the U-shaped carriage 21. In order to enable the installed sliding plate 8 and U-shaped carriage 21 to be placed flat on the ground, the present invention makes the following settings for the specific structure of the tailgate 3 and the connection method between the carriage 2 and the tailgate 3: Please see Figures 7-8 The tail plate 3 includes a movable plate 31 and a rotating plate 32 that are slidably connected up and down. One end of the rotating plate 32 is rotatably connected to the frame 1. A T-shaped slider 3101 is fixedly connected to the end of the movable plate 31 near the rotating plate 32. A T-shaped groove 3201 is opened at the end of the rotating plate 32 near the movable plate 31. The T-shaped slider 3101 is slidably connected inside the T-shaped groove 3201. Through the cooperation of the T-shaped slider 3101 and the T-shaped groove 3201, the movable plate 31 can move up and down along the rotating plate 32. The U-shaped body 21 and the rotating plate 32 are connected by a plug assembly. Please refer to [link / reference]. Figure 1 , Figure 2 and Figure 5 The insert assembly includes a screw, a pair of nuts, and multiple hollow plates 5, combined with... Figure 8 and Figure 9As shown, there are at least three hollow panels 5. One hollow panel 5 is fixedly connected to the U-shaped body 21, and another pair of hollow panels 5 are fixedly connected to the rotating plate 32. When connecting the carriage 2 and the tail plate 3, the carriage 2 and the tail plate 3 are in close contact with each other. At this time, the center lines of the three hollow panels 5 are on the same straight line. The screw is inserted into the interior of the three hollow panels 5 at the same time, and then a pair of nuts are threaded to the upper and lower ends of the screw until they are pressed against the surfaces of the upper and lower hollow panels 5 respectively. This achieves the connection between the carriage 2 and the tail plate 3. In addition, the hollow panel 5 on the U-shaped body 21 is located in the middle of another pair of hollow panels 5, and the middle part of the screw is not threaded and is a smooth surface. This smooth surface is in sliding connection with the hollow panel 5 in the middle position, so that the U-shaped body 21 has a certain vertical movement capability when connected to the tail plate 3.

[0025] Based on the movable arrangement of the U-shaped body 21 and the movable plate 31, when the sliding plate 8 is placed on soft ground, it may slightly sink due to its own weight. Even if it does not sink significantly, because the distance between the lower end of the carriage 2 and the ground is less than or equal to the thickness of the sliding plate 8, there will be a small gap between the U-shaped body 21 and the sliding plate 8 after rotating 270° (e.g., Figure 7 As shown), the U-shaped box 21 can move downward under its own weight or with manual assistance until its lower opening is in contact with the sliding plate 8 on the ground. Then, the moving plate 31 is also moved downward, and the T-shaped slider 3101 slides in the T-shaped groove 3201, so that the lower end of the moving plate 31 is in contact with the upper end of the sliding plate 8, thereby making the moving plate 31, the U-shaped box 21 and the sliding plate 8 form a new box for holding materials.

[0026] Please see Figure 1 , Figure 3 and Figure 7 The sides of the U-shaped body 21, the bottom plate 22, the moving plate 31, and the sliding plate 8 are all fixedly connected with multiple evenly distributed perforated seats 9. A portion of the perforated seats 9 on the U-shaped body 21 correspond one-to-one with multiple perforated seats 9 on the bottom plate 22 and are connected by bolt assemblies (e.g., ...). Figure 5 As shown), another part of the U-shaped body 21 with perforated seats 9 and the perforated seats 9 on the moving plate 31 correspond one-to-one with multiple perforated seats 9 on the sliding plate 8 and are connected by bolt assemblies (e.g. Figure 7 and Figure 9 As shown), the bolt assembly includes a bolt and a nut. Both the bolt and the nut are existing technologies and will not be described in detail here. Through the use of the bolt assembly and the seat with holes 9, the U-shaped body 21 and the bottom plate 22 are detachably connected, as well as the U-shaped body 21, the moving plate 31 and the sliding plate 8 are detachably connected.

[0027] With the above-described structure, the operation of this tracked transport vehicle includes the following steps: Step 1, Regular Transportation: such as Figure 1 As shown, the carriage 2 is located at the upper end of the frame 1. After the material is loaded into the carriage 2, the weight of the carriage 2 and the material is borne by the frame 1. The tracked vehicle body is started to realize the material transportation. This transportation method is best suited for use on hard surfaces or for transporting lightweight materials. Step 2, Full Skid-Slip Transport: Step 2.1: For soft transport surfaces, before use, if... Figure 3 and Figure 4 As shown, a sliding plate 8 is placed on the ground at the rear end of the tracked vehicle body. Then, the first hydraulic cylinder 4 and the second hydraulic cylinder 7 are activated. The first hydraulic cylinder 4 extends to push the carriage 2 and the tail plate 3 to rotate. The second hydraulic cylinder 7 extends to support the carriage 2 and the tail plate 3 during the rotation process. After the second hydraulic cylinder 7 supports the tail plate 3, it slowly retracts to guide the carriage 2 and the tail plate 3 to continue rotating under their own weight until they complete a 270° rotation. At this time, the carriage 2 is located on the upper side of the sliding plate 8. Additional notes: 1. When the second hydraulic cylinder 7 retracts, the first hydraulic cylinder 4 also retracts until it returns to its initial length. 2. If... Figure 4 As shown, the center of gravity N of the combined structure of carriage 2 and tailgate 3 is approximately located at the center of carriage 2. Therefore, when the first hydraulic cylinder 4 pushes carriage 2 to a position where the center of gravity N is located... Figure 4 When the vertical dotted line L is to the right, the first hydraulic cylinder 4 and the second hydraulic cylinder 7 can retract. At this time, the second hydraulic cylinder 7 supports the tail plate 3. As the second hydraulic cylinder 7 slowly retracts, due to the position of the center of gravity N, the carriage 2 and the tail plate 3 will continue to slowly rotate away from the front of the vehicle under their own weight. Both are always supported by the second hydraulic cylinder 7 until the extension end of the second hydraulic cylinder 7 is completely retracted into the inclined hole. At this time, the carriage 2 and the tail plate 3 complete a 270° rotation.

[0028] Step 2.2: Adjust the height of the carriage 2, that is: lower the carriage 2 and the moving plate 31 so that their lower ends contact the sliding plate 8, and then connect the U-shaped carriage 21 and the sliding plate 8, as well as the moving plate 31 and the sliding plate 8, through the bolt assembly; Step 2.3: Remove the bottom plate 22 to facilitate loading materials into the U-shaped box 21 from top to bottom. Start the tracked vehicle body to drive the U-shaped box 21 and sliding plate 8 loaded with materials to slide on the soft ground. As can be seen from the above usage, this invention can select different transportation methods according to the usage environment. When transporting heavy objects on hard ground, it adopts the same transportation method as existing tracked vehicles, with the cargo box 2 located on the frame 1, and the frame 1 bearing the weight of the cargo box 2 and its internal materials. When used on soft ground such as mud, sand, or snow, the empty cargo box 2 is rotated 270° backward and connected to the sliding plate 8 pre-placed on the ground to form a new container for holding materials. This transfers the weight of the cargo box 2 and the materials from the frame 1 to the ground, thereby reducing the impact of the tracked vehicle body on the ground. The pressure is reduced, thus decreasing the degree of track sinking on the ground. On the other hand, compared to the contact area between the track and the ground, the use of a larger sliding plate 8 to transfer the weight of the material to the ground can better disperse the pressure and reduce the sinking depth of the sliding plate 8 on the ground. This invention, through gravity transfer, transforms the deep sinking of the track on soft ground in the traditional method into a slight sinking of both the track and the sliding plate 8. At this time, the sliding plate 8 is driven by the tracked vehicle body to slide on the ground, which can effectively reduce the driving resistance generated by the soft ground on the vehicle, making the transportation process more passable and stable.

[0029] Please see Figure 10 When the present invention is in normal transportation mode, because the material accumulates in the carriage 2, pressing the carriage 2 against the upper end of the frame 1, even if the carriage 2 is not connected and fixed to the frame 1, the carriage 2 and the material inside can maintain stable transportation under the action of gravity. In addition, considering the possibility of empty frame transportation of the carriage 2, in order to improve the stability of the carriage 2 on the upper end of the frame 1, some perforated seats 9 can be added to the side of the bottom plate 22 and the edge of the U-shaped body 21 near the end of the frame 1. At the same time, multiple mounting slots are opened on the upper end of the frame 1. During normal use, the carriage 2 is connected by bolts ( Figure 10 (M) is inserted from top to bottom into the perforated seats 9 on the U-shaped body 21 and the bottom plate 22 until it is screwed into the mounting groove, thereby fixing the carriage 2 to the frame 1 and improving the stability of the carriage 2 on the frame 1.

[0030] When it is necessary to rotate the carriage 2, which is placed on the ground, back to the upper end of the frame 1, first remove the materials from the carriage 2, remove the bolt assembly between the U-shaped body 21, the moving plate 31, and the sliding plate 8, and reinstall the bottom plate 22 onto the upper end of the U-shaped body 21. Then, start the second hydraulic cylinder 7 and the first hydraulic cylinder 4. The second hydraulic cylinder 7 extends to push the side end of the carriage 2, causing the carriage 2 to rotate upward. After the first hydraulic cylinder 4 extends, it supports the carriage 2 as it gradually rotates to a higher position. When the center of gravity N of the carriage 2 and the tail plate 3 rotates to... Figure 4When the vertical dotted line L is to the left, the first hydraulic cylinder 4 and the second hydraulic cylinder 7 can retract. As the first hydraulic cylinder 4 slowly retracts, due to the position of the center of gravity N, the carriage 2 and the tailboard 3 will continue to slowly rotate towards the side closer to the front of the vehicle under their own weight. Both are always supported by the first hydraulic cylinder 4 until the carriage 2 is placed flat on the upper part of the frame 1.

[0031] Second implementation method: This embodiment, based on the first embodiment, divides the U-shaped box 21 into a pair of half-boxes 2101, and adds a cross plate 2102 and a third hydraulic cylinder 10, as detailed below: Please refer to Figure 11 The U-shaped box 21 includes a pair of stacked half-boxes 2101. A pair of horizontal plates 2102 are fixedly connected to the side ends of the upper half-box 2101. A pair of third hydraulic cylinders 10 are fixedly connected to the upper end of the frame 1, and the pair of third hydraulic cylinders 10 are located below the pair of horizontal plates 2102. The telescopic ends of the third hydraulic cylinders 10 extend obliquely upwards in a direction away from the front end of the tracked vehicle body. The telescopic ends of the third hydraulic cylinders 10 are also not connected to the lower end of the horizontal plates 2102. Multiple evenly distributed perforated seats 9 are fixedly connected to the adjacent side edges of the pair of half-boxes 2101, and the perforated seats 9 in corresponding positions are... The two halves of the box 2101 are connected by bolts to achieve the connection and separation of the two halves. The lower half of the box 2101 is connected to the bottom plate 22, and the hollow plate 5 is fixedly connected to the upper half of the box 2101. When the connection of the two halves of the box 2101 is broken, the lower half of the box 2101 is not connected to the tail plate 3. The upper half of the box 2101 is still connected to the tail plate 3 through the cooperation of the hollow plate 5 and the screw assembly. This allows the upper half of the box 2101 to be located on the ground and move up and down after rotating 270° with the tail plate 3, which is convenient for connecting with the sliding plate 8. The lower half of the box 2101 is still located on the upper end of the frame 1.

[0032] By configuring the above structure, this invention not only has conventional transportation and full skid-steer transportation modes, but also a semi-skid-steer transportation mode. The specific operation method is as follows: Please see Figure 12 and Figure 13 Similarly, for soft transport ground, before use, disconnect the connection between a pair of half-boxes 2101, place the sliding plate 8 on the ground at the rear of the tracked vehicle body, start the third hydraulic cylinder 10 and the second hydraulic cylinder 7. The third hydraulic cylinder 10 extends to push the tail plate 3 and the upper half-box 2101 to rotate. The second hydraulic cylinder 7 extends to support the half-box 2101 and the tail plate 3 during the rotation. After the second hydraulic cylinder 7 supports the tail plate 3, it slowly retracts to guide the half-box 2101 and the tail plate 3 to continue rotating under their own weight until they complete a 270° rotation. At this time, the half-box 2101 is located on the upper side of the sliding plate 8. Adjust the height of the half-box 2101 so that it contacts the sliding plate 8, and connect the half-box 2101 and the sliding plate 8, as well as the moving plate 31 and the sliding plate 8, through bolt assemblies; Light materials are loaded into the upper half-box 2101 of the chassis 1, and heavy materials are loaded into the lower half-box 2101 on the ground. The tracked vehicle body is then started to transport the two materials simultaneously.

[0033] When there is a need for material transportation, the above operation allows half of the carriage 2 (i.e., the upper half of the carriage 2101) to be rotated and placed on the ground, forming a small carriage with the sliding plate 8 for holding heavy materials. The remaining half of the carriage 2101 remains on the upper part of the frame 1 and is used to hold light materials. This operation does not easily increase the pressure of the tracked vehicle body on the ground, does not significantly increase the degree of track sinking, has high passability and stability, and meets the requirement of transporting both light and heavy materials at the same time. Supplementary explanation: Since the rear end of the upper half of the carriage 2101 on the frame 1 is in an open state, this half of the carriage 2101 is suitable for placing non-small bulk materials, such as wheat straw, rice straw, etc. After installation, the upper surface of the material can protrude to the upper end of the half of the carriage 2101. In this way, ropes can be crisscrossed between the perforated seats 9 on both sides of the half of the carriage 2101 to press the upper end of the material, improving the stability of the material placement.

[0034] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A tracked transport vehicle with a modular expandable cargo box, comprising a tracked vehicle body, the tracked vehicle body comprising a frame (1), a cargo box (2), a tail plate (3), and a first hydraulic cylinder (4), the tail plate (3) being mounted on the rear opening end of the cargo box (2), and the tail plate (3) being rotatably connected to the frame (1), the first hydraulic cylinder (4) being mounted on the frame (1) and located on the lower side of the cargo box (2), characterized in that: It also includes a rear end plate (6), a second hydraulic cylinder (7), and a sliding plate (8). The upper end of the rear end plate (6) is fixedly connected to the lower end of the rear of the frame (1). The cylinder of the second hydraulic cylinder (7) is fixedly connected to the frame (1), and the telescopic end of the second hydraulic cylinder (7) extends obliquely upward in a direction away from the front end of the tracked vehicle body. The rear end plate (6) is provided with an oblique hole for the second hydraulic cylinder (7) to move through. The length and width of the sliding plate (8) are matched with the length and width of the carriage (2), respectively, and the sliding plate (8) and the carriage (2) are detachably connected. Next, the carriage (2) includes a U-shaped body (21) and a floor plate (22), and the U-shaped body (21) and the floor plate (22) are also detachably connected. The tail plate (3) includes a movable plate (31) and a rotating plate (32) that are slidably connected up and down. One end of the rotating plate (32) is rotatably connected to the frame (1). The U-shaped body (21) and the rotating plate (32) are connected by a plug rod assembly. In the initial state, the carriage (2) is located at the upper end of the frame (1). When the tail plate (3) drives the carriage (2) to rotate 270°, the carriage (2) sits on the ground.

2. A tracked transport vehicle with a modular expandable cargo box according to claim 1, characterized in that: The insertion rod assembly includes a screw, a pair of nuts, and multiple hollow plates (5). The multiple hollow plates (5) are respectively fixedly connected to the U-shaped box (21) and the rotating plate (32). The screw is inserted into the interior of the multiple hollow plates (5), and the pair of nuts are respectively threaded to the upper and lower ends of the screw.

3. A tracked transport vehicle with a modular expandable cargo box according to claim 1, characterized in that: When the carriage (2) rotates 270° with the tail plate (3), the distance between the lower end of the carriage (2) and the ground is less than or equal to the thickness of the sliding plate (8).

4. A tracked transport vehicle with a modular expandable cargo box according to claim 1, characterized in that: The moving plate (31) is fixedly connected to a T-shaped slider (3101) at one end near the rotating plate (32), and a T-shaped groove (3201) is opened at one end of the rotating plate (32) near the moving plate (31). The T-shaped slider (3101) is slidably connected inside the T-shaped groove (3201).

5. A tracked transport vehicle with a modular expandable cargo box according to claim 1, characterized in that: The sides of the U-shaped body (21), the bottom plate (22), the moving plate (31) and the sliding plate (8) are all fixedly connected with a plurality of evenly distributed perforated seats (9). A portion of the perforated seats (9) on the U-shaped body (21) correspond one-to-one with the plurality of perforated seats (9) on the bottom plate (22) and are connected by bolt assemblies. The other portion of the perforated seats (9) on the U-shaped body (21) and the perforated seats (9) on the moving plate (31) correspond one-to-one with the plurality of perforated seats (9) on the sliding plate (8) and are connected by bolt assemblies.

6. A tracked transport vehicle with a modular expandable cargo box according to claim 2, characterized in that: The U-shaped box (21) includes a pair of stacked half-boxes (2101). A pair of horizontal plates (2102) are fixedly connected to the two sides of the upper half-box (2101). A pair of third hydraulic cylinders (10) are fixedly connected to the upper end of the frame (1). The pair of third hydraulic cylinders (10) are located on the lower side of the pair of horizontal plates (2102). The telescopic end of the third hydraulic cylinder (10) extends obliquely upward in a direction away from the front end of the tracked vehicle body.

7. A tracked transport vehicle with a modular expandable cargo box according to claim 6, characterized in that: The side edges of the pair of half-boxes (2101) that are close to each other are also fixedly connected with a plurality of evenly distributed perforated seats (9), and the pairs of perforated seats (9) that are in corresponding positions are also connected by bolt assemblies.

8. A tracked transport vehicle with a modular expandable cargo box according to claim 6, characterized in that: The lower half-section (2101) is connected to the bottom plate (22), the hollow plate (5) is fixedly connected to the upper half-section (2101), and the upper half-section (2101) is located on the ground and connected to the sliding plate (8) after rotating 270° with the tail plate (3).

9. A tracked transport vehicle with a modular expandable cargo box according to claim 6, characterized in that: Its usage includes the following steps: Step 1, Regular Transportation: The carriage (2) is located at the top of the frame (1). After the material is loaded into the carriage (2), the weight of the carriage (2) and the material is borne by the frame (1). Start the tracked vehicle body to realize material transportation. Step 2, full sliding transport: For soft transport ground, before use, place the sliding plate (8) on the ground at the rear end of the tracked vehicle body, and then start the first hydraulic cylinder (4) and the second hydraulic cylinder (7). The first hydraulic cylinder (4) extends to push the carriage (2) and tail plate (3) to rotate. The second hydraulic cylinder (7) extends to support the carriage (2) and tail plate (3) during the rotation process. After the second hydraulic cylinder (7) supports the tail plate (3), it slowly retracts to guide the carriage (2) and tail plate (3) to continue rotating under their own weight until they complete a 270° rotation. At this time, the carriage (2) is located on the upper side of the sliding plate (8). Adjust the height of the carriage (2) so that it contacts the sliding plate (8), and connect the U-shaped carriage (21) and the sliding plate (8) and the moving plate (31) and the sliding plate (8) through bolt assembly. Remove the bottom plate (22), then load the material into the U-shaped box (21), start the tracked vehicle body, and drive the U-shaped box (21) and sliding plate (8) loaded with material to slide on the soft ground; Step 3, Semi-sliding transport: For soft transport ground, before use, disconnect the connection between a pair of half-boxes (2101), place the sliding plate (8) on the ground at the rear end of the tracked vehicle body, start the third hydraulic cylinder (10) and the second hydraulic cylinder (7), the third hydraulic cylinder (10) extends to push the tail plate (3) and the upper half-box (2101) to rotate, the second hydraulic cylinder (7) extends to support the half-box (2101) and the tail plate (3) during the rotation process, when the second hydraulic cylinder (7) supports the tail plate (3), it slowly retracts to guide the half-box (2101) and the tail plate (3) to continue rotating under their own weight until the two complete a 270° rotation, at which time the half-box (2101) is located on the upper side of the sliding plate (8); Adjust the height of the half-box (2101) so that it contacts the sliding plate (8), and connect the half-box (2101) and the sliding plate (8) and the moving plate (31) and the sliding plate (8) through bolt assembly. Light materials are loaded into the half-box (2101) on the upper side of the chassis (1), and heavy materials are loaded into the half-box (2101) on the ground. The tracked vehicle body is started to transport the two materials simultaneously.

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