Two-box combined logistics transport vehicle

Abstract

The application discloses a two-box combined logistics transport vehicle, which comprises a vehicle body, two boxes placed on the vehicle body, and a clamping mechanism for detachably and fixedly connecting between the bottom of any box and the vehicle body. The clamping mechanism comprises a bottom plate arranged on the bottom of any box, at least two parallel first grooves arranged on the bottom plate, and a square rail fixedly arranged on the vehicle body and clamped with the first grooves. A lifting arm is arranged on the vehicle body and located between the two boxes and used for lifting the boxes. The two-box structure can be flexibly transferred according to the types and destinations of different commodities / goods. When transferring, the boxes only need to be lifted and changed, the goods do not need to be unloaded and loaded by opening the boxes, the occurrence of goods damage is avoided, and the efficiency of logistics transfer is improved.

Description

Technical Field

[0001] This invention relates to the field of logistics equipment technology, and more particularly to the field of logistics transportation equipment and transportation and storage equipment technology, specifically to a two-box combined logistics transportation vehicle. Background Technology

[0002] Logistics, as part of supply chain activities, is the planning, implementation, and control of the efficient and low-cost flow and storage of goods, services, and related information from production to consumption to meet customer needs. Centered on warehousing, logistics promotes synchronization between production and the market. Logistics aims to meet customer needs by planning, implementing, and managing the entire process of transporting raw materials, semi-finished products, finished products, and related information from the point of origin to the point of consumption, through transportation, storage, and distribution, at the lowest possible cost.

[0003] In the logistics transportation sector, automobiles are the most widely used, most frequently used, and one of the most important transportation carriers. Existing logistics vehicles all use box trucks or flatbed trucks to carry containers. For box trucks, the box and the vehicle body are fixed and cannot be interchanged; goods to be transported can only be placed in the box. This method limits the types of goods that can be transported. It is mainly suitable for transporting single-variety goods, and its drawbacks become apparent when transporting multiple varieties of goods, especially when loading and unloading times are unpredictable. This is mainly because the unloading port of a fixed-body box truck is usually at the rear or middle, meaning that goods at the end can only be unloaded after other goods have been unloaded. This deficiency leads to low transfer efficiency. Some industries use flatbed trucks to transport containers for container transfer at transit stations to facilitate logistics dispatching. However, this only solves long-distance transfers and facilitates transfers between different modes of transportation; it does not solve the problems of parallel transfers and unloading in the logistics process. Therefore, the applicant, taking into account the existing logistics realities, has proposed a brand-new transport vehicle to replace the existing fixed box trucks and flatbed container trucks in order to meet the needs of multi-variety, multi-location, and mid-way transshipment logistics transportation. Summary of the Invention

[0004] To address the problems of high loading and unloading time and low transfer efficiency in existing logistics transportation, such as the need to unload multiple categories of goods in a single container due to intermediate transfers or the arrival of some goods at a station, and the possibility of other goods obstructing the unloading process and requiring unloading of other goods at the same time, this application provides a two-compartment combined logistics transport vehicle. This vehicle can load different categories of goods into separate containers, and when transfer is needed, there is no need to open the containers; only the containers need to be hoisted. This method eliminates the possibility of cargo damage caused by opening the containers, and the transfer between logistics vehicles on different routes can be completed within minutes. Compared with single-container unloading and transfer, the cargo damage rate is strictly controlled, and the transfer efficiency is significantly improved.

[0005] To more clearly illustrate the advantages of this application compared to existing box-type logistics, the following explanation addresses a specific issue: There are several pumpkins and watermelons located in location A. Assume some pumpkins need to be transported to location C, and some watermelons to location D. Both destinations require a transit point at location B. The total capacity of the pumpkins and watermelons is insufficient to fill a single box. According to the logistics route plan, one vehicle would simultaneously transport both pumpkins and watermelons to location B, where they would then be transferred. If existing fixed box trucks were used, the pumpkins and watermelons would need to be unloaded and then loaded separately onto the delivery trucks bound for locations C and D. This would involve a single loading and unloading operation, increasing cargo damage and wasting significant time. In the two-box combined logistics transportation method of this application, pumpkins and watermelons can be separated into different boxes. After arriving at location B, the boxes can be directly hoisted to the logistics vehicles bound for locations C and D. The entire process does not require unpacking, transfer, or loading and unloading, thus preventing damage to the goods. At the same time, the entire transfer process can be completed in a short time. Generally, the actual hoisting of two boxes will not exceed 15 minutes, greatly improving the transfer efficiency.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] A two-box combined logistics transport vehicle includes a vehicle body, two boxes placed on the vehicle body, the bottom of any one of the boxes being detachably and fixedly connected to the vehicle body via a snap-fit ​​mechanism, the snap-fit ​​mechanism including a bottom plate disposed at the bottom of any one of the boxes, the bottom plate being provided with at least two parallel first grooves, a square rail fixedly disposed on the vehicle body to snap into the first grooves; and a crane arm disposed on the vehicle body between the two boxes for lifting the boxes.

[0008] To facilitate the installation, snapping, loosening, and hoisting of the enclosure, preferably, a second groove is provided at the bottom of the square rail along its length, and a plurality of vertical clearance holes are also provided at intervals at the bottom of the second groove. A plurality of through holes are also provided horizontally on the square rail, and the number of through holes corresponds one-to-one with the clearance holes and they are interconnected.

[0009] It also includes a telescopic mechanism fixedly installed on the vehicle body, a tongue plate connected to the telescopic mechanism and installed in the second groove, and multiple locking pins fixedly connected to the tongue plate and slidably disposed in any through hole. Each locking pin includes a guide section with a conical or wedge-shaped structure at its upper end and a columnar body section, so that the up-and-down movement of the locking pin pushes multiple steel balls disposed in the through hole to move horizontally left and right and form a locking with the third grooves provided on the side walls of the first groove. Since the length of the square rail occupies most of the container or runs through the entire container, the difficulty of alignment during hoisting is reduced, making alignment and installation easier, effectively reducing the difficulty of hoisting and the number of auxiliary personnel, thereby improving hoisting efficiency. Compared with the four-corner buckle fixing method used for containers, the step of adjusting the position of the container after hoisting is eliminated.

[0010] To improve structural stability and ensure that the steel ball is never confined inside the through hole and is not affected by loosening or jamming, the diameter of the limiting hole formed by the intersection of the outer wall of the square rail and the through hole is less than or equal to 80% of the diameter of the steel ball.

[0011] To ensure a more secure connection between the square rail and the housing, and to guarantee a greater outward protrusion dimension for the same steel ball diameter, thereby enabling a more robust connection between the steel ball and the housing, preferably, when the steel ball near the locking pin contacts the columnar body section of the locking pin, the total gap width between all steel balls in the same through hole on the same side of the square rail does not exceed 15% of the steel ball radius.

[0012] To improve the efficiency of transfer and hoisting, preferably, the boom includes a base fixedly connected to the vehicle body, a retractable vertical arm rotatably engaged with the base, and a planetary turntable mechanism is provided inside the base, the output end of the planetary turntable mechanism being connected to the vertical arm; a retractable horizontal arm is hinged to the upper end of the vertical arm, and a lifting head for engaging with the box body is provided at one end of the horizontal arm.

[0013] More preferably, the lifting head includes an upper mounting plate, a lower mounting plate, multiple telescopic mechanisms for adjusting the relative distance and / or angle between the upper and lower mounting plates, and a rotating mechanism disposed on the lower mounting plate. The lower end of the rotating mechanism is fixedly connected to a locking plate for engaging the box body, and the top of the box body is provided with a lifting cover that matches and engages with the locking plate.

[0014] In a further preferred embodiment, the cover includes two symmetrically arranged cover bodies, with a space between the cover bodies for accommodating the card plate, and each cover body has a concave structure at its bottom. The concave structure and the top part of the box form a space for accommodating the card plate, and the top of the concave structure is also provided with a fourth groove for accommodating a limiting plate. The limiting plate is fixedly disposed on the upper surface of the card plate near its end.

[0015] To ensure stability during hoisting and prevent accidents caused by the container slipping, preferably, the limiting plate is also equipped with a contact-type limit switch lower than the upper surface of the limiting plate. This contact-type limit switch is connected in series with an indicator light located in the driver's cab of the vehicle. The fourth groove has a protrusion that abuts against the contact-type limit switch. The advantage of using this contact-type limit switch is that when the operator sees the indicator light illuminate, it ensures that the limiting plate is definitely located within the fourth groove. In other words, the clamping plate will not slip relative to the side due to the nesting and blocking effect of the limiting plate and the fourth groove, thus ensuring the stability of the container during hoisting.

[0016] To further enhance the stability between the container and the vehicle body, preferably, a locking mechanism is also provided between the vehicle body and the container. The locking mechanism includes a bracket mounted on the vehicle body, with a threaded rod threaded onto the bracket. A threaded blind hole, threaded to the rod, is provided at a corresponding position on the side wall of the container. The longitudinal arrangement of the square rails and the container can overcome the lateral and longitudinal shear forces generated by the vehicle body during operation. Although the vehicle body typically has a blocking structure to prevent slippage due to failure of the container's fixing or locking mechanisms, this protective structure is not subjected to force when the container is normally fixed; it only serves a protective function. To prevent the axial force generated during vehicle acceleration or braking from impacting the steel balls during transportation, the locking mechanism between the container and the vehicle body effectively counteracts the axial force, ensuring the container remains stationary throughout transportation and improving its stability and safety.

[0017] Beneficial effects:

[0018] 1. The present invention adopts a two-box structure, which can flexibly transfer according to different types of goods / goods and destinations. During the transfer, only the boxes need to be hoisted and transferred to other vehicles. There is no need to open the boxes to load and unload the items, thus avoiding damage to the goods and improving the efficiency of logistics transfer.

[0019] 2. The box body and the vehicle body are connected and snapped together using square rails, which avoids the problems of high requirements for the placement of the box body, high hoisting difficulty, and long hoisting operation time that are associated with point-to-point connection methods. The steel ball snapping mechanism can ensure the stability of the snapping and avoid the problem of structural stress concentration. At the same time, it can automatically loosen without the need for personnel to get off the vehicle for inspection. Compared with existing locking and fastening parts, which require manual fastening and loosening, it is more convenient. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an isometric view of the structure of this invention.

[0022] Figure 2 yes Figure 1 Enlarged view of the structure in area A.

[0023] Figure 3 yes Figure 1 The main view.

[0024] Figure 4 This is the front view of the crane boom.

[0025] Figure 5 yes Figure 3 Full sectional view of the section symbol BB along the center line.

[0026] Figure 6 yes Figure 5 Enlarged view of the structure in the C region.

[0027] Figure 7 yes Figure 6 Enlarged view of the structure in the middle D region.

[0028] In the diagram: 1-Car body; 2-Box body; 3-Hanging boom; 31-Base; 32-Vertical boom; 33-Horizontal boom; 34-Lifting head; 341-Telescopic mechanism; 342-Upper mounting plate; 343-Rotating mechanism; 344-Lower mounting plate; 345-Clamping plate; 346-Limiting plate; 35-Hydraulic cylinder; 36-Planetary turntable mechanism; 4-Lifting cover; 5-Locking mechanism; 51-Bracket; 52-Screw; 6-Clamping mechanism; 61-Telescopic mechanism; 62-Tongue plate; 63-Square rail; 64-Through hole; 65-Steel ball; 66-Base plate. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0034] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] Example 1:

[0036] Refer to the instruction manual. Figure 1 , Figures 5-7 The illustrated two-box combined logistics transport vehicle includes a vehicle body 1, two boxes 2 placed on the vehicle body 1, and the bottom of any box 2 being detachably and fixedly connected to the vehicle body 1 by a snap-fit ​​mechanism 6. The snap-fit ​​mechanism 6 includes a bottom plate 66 disposed at the bottom of any box 2, the bottom plate 66 having at least two parallel first grooves, and a square rail 63 fixedly disposed on the vehicle body 1 to snap into the first grooves; and a crane arm 3 disposed on the vehicle body 1 between the two boxes 2 for lifting the boxes 2.

[0037] Working principle:

[0038] The two-box combined logistics transport vehicle provided in this embodiment differs from existing box trucks, flatbed trucks, and container fixing methods in two main ways: First, the number of boxes 2 in a single transport vehicle is two and they are placed independently of each other, so the installation, fixing, and disassembly of any box 2 are not affected by the other boxes 2; Second, the fixing method of the box 2 adopts a horizontal and vertical snap-fit ​​structure formed by the square rail 63 and the first groove set at the bottom of the box 2, thereby fixing the box 2 on the square rail 63. It does not require the point-to-point snap-fit ​​structure used in existing containers, thus effectively improving the convenience of box 2 installation and hoisting. The advantage of using square rails 63 for fixing is that, in actual hoisting, the container 2 is usually not perfectly level, and it is impossible to guarantee that the bottom of the container 2 is perfectly parallel to the vehicle body 1. However, since there are two parallel square rails 63, as long as any of the first grooves is aligned with any position of the corresponding square rail 63, continuing to lower the container 2 will align the other square rail 63 with the first groove. As the container 2 continues to be lowered, with the matching of the square rail 63 and the first groove, the container 2 can naturally fall onto the square rail 63. Its matching position is adaptive, unlike the traditional point-to-point locking structure, which requires the container to be placed in a single specific position to achieve multiple locks to fix the container at the same time. In this way, the hoisting efficiency is greatly improved by using the structure of square rails 63 and the first groove in this embodiment to lock the container 2.

[0039] Example 2:

[0040] To facilitate the installation, snap-fitting, and loosening / hoisting of housing 2, this embodiment, based on embodiment 1, further incorporates the details provided in the appendix to the instruction manual. Figure 1 , Figures 5-7 As shown, the bottom of the square rail 63 is provided with a second groove along the length direction, and the bottom of the second groove is also provided with a plurality of vertical clearance holes at intervals. The square rail 63 is also provided with a plurality of horizontal through holes 64, the number of the through holes 64 corresponding one-to-one with the clearance holes and interconnected with each other.

[0041] It also includes a telescopic mechanism 61 fixedly installed on the vehicle body 1, and a tongue plate 62 connected to the telescopic mechanism 61 and installed in the second groove. Multiple locking pins are fixedly connected to the tongue plate 62 and slidably disposed in any through hole 64. Each locking pin includes a guide section with a conical or wedge-shaped structure at its upper end and a columnar body section. The locking pins move up and down, pushing multiple steel balls 65 disposed in the through hole 64 to move horizontally left and right, forming a locking engagement with the third grooves 67 disposed on both sides of the first groove. The third grooves 67 can be continuous or discrete, thus preventing the housing 2 from sliding along the square rail 63 by utilizing the locking between the third groove 67 and the steel balls 65. Alternatively, other existing blocking or locking devices to prevent axial sliding can be used, or existing locking structures or enlarged ends can be provided at the ends of the square rail 63 for blocking. Since the length of the square rail 63 occupies most of the housing 2 or runs through the entire housing 2, the difficulty of hoisting and alignment is reduced, making alignment and installation easier, effectively reducing the difficulty of hoisting and the number of auxiliary personnel, thereby improving hoisting efficiency. Compared to the four-corner buckle fixing method used for containers, this eliminates the need to adjust the container's position after hoisting.

[0042] This embodiment specifically provides a snap-fit ​​mechanism 6 that enables the square rail 63 and the first groove of the housing 2 to form a snap-fit ​​or release structure. Specifically, the telescopic mechanism 61 drives the tongue plate 62 to move up and down, thereby driving the snap-fit ​​pin to move up and down. Under the guidance of the conical or wedge structure, the steel balls 65 located in the through holes 64 on both sides are pushed to move left and right in the through holes 64, thereby realizing snap-fit / release. As the locking pin moves upward, the contact point between the steel ball 65 and the locking pin gradually moves from the guide section to the columnar body section. During this process, the steel ball 65 is pushed to both sides by the locking pin. The steel ball 65 located at the outermost edge will extend to the outside of the two side walls of the square rail 63 and enter the first groove. At this time, since the steel ball 65 is between the container body 2 and the square rail 63, the two cannot move relative to each other. In addition, the first groove adopts an arc shape that is adapted to the steel ball 65. This ensures that when the steel ball 65 is subjected to shear force, there will be no stress concentration problem that is unavoidable in the existing container buckle fixing method, thereby improving the service life of the structure. Furthermore, since the steel ball 65 that is subjected to the greatest force is the outermost one, and there are multiple steel balls 65 in the through hole 64, the service life of the steel ball 65 can be greatly extended by changing the position of the steel ball 65 at any time. This has obvious advantages compared with the existing buckle-type structural components. When detachment is required, it can be achieved through the telescopic mechanism 61, such as existing cylinders, lead screw motors, hydraulic cylinders, etc. The telescopic mechanism 61 drives the tongue plate 62 and the locking pin to move downward in sequence until the steel ball 65 is separated from the contact with the columnar body section. At this time, the locking pin continues to move downward, so that the free movement space of the steel ball 65 in the through hole 64 gradually increases until the outermost steel ball 65 can be completely retracted into the through hole 64. At this time, the box 2 will no longer be blocked by the steel ball 65 during hoisting, thus enabling free hoisting.

[0043] To improve structural stability and ensure that the steel ball 65 is never confined within the through hole 64 and is not affected by loosening or jamming, the diameter of the limiting hole formed by the intersection of the outer wall of the square rail 63 and the through hole 64 is less than or equal to 80% of the diameter of the steel ball 65. The larger the diameter of the limiting hole, the more of the steel ball 65 protrudes from the outside of the square rail 63, resulting in a more stable jamming structure. However, it cannot be equal to the diameter of the steel ball 65; otherwise, without the action of the housing 2, an abnormal rise of the locking pin could cause the steel ball 65 to detach. Conversely, the smaller the diameter of the limiting hole, the less of the steel ball 65 protrudes from the outside of the square rail 63, resulting in relatively poorer stability of the jamming structure. The use of a limiting hole diameter less than or equal to 80% of the diameter of the steel ball 65 in this embodiment is only one preferred parameter. Those skilled in the art can flexibly change the relationship between the diameter of the steel ball 65 itself and the diameter of the limiting hole to obtain a better jamming effect based on the stress range that the actual housing 2 may generate during actual transportation.

[0044] To ensure a more secure connection between the square rail 63 and the housing 2, and to guarantee a greater outward protrusion dimension for the same diameter of the steel ball 65, thereby enabling a more robust connection between the steel ball 65 and the housing 2, preferably, when the steel ball 65 near the locking pin contacts the columnar body section of the locking pin, the total gap width between all steel balls 65 located in the same through hole 64 on the same side of the square rail 63 does not exceed 15% of the radius of the steel ball 65. If the gap is too large, the stability of the connection between the housing 2 and the square rail 63 cannot be effectively guaranteed.

[0045] Example 3:

[0046] To improve the efficiency of transfer and hoisting, this embodiment, based on any of the above embodiments, further incorporates the following features from the appendix to the specification. Figures 1-4 As shown, the boom 3 includes a base 31 fixedly connected to the vehicle body 1. A retractable vertical arm 32 is rotatably engaged with the base 31, and a planetary turntable mechanism 36 is also provided within the base 31. The output end of the planetary turntable mechanism 36 is connected to the vertical arm 32. A retractable horizontal arm 33 is hinged to the upper end of the vertical arm 32, and one end of the horizontal arm 33 is provided with a lifting head 34 for engaging with the housing 2. (See also...) Figure 4 As shown, the horizontal arm 33 adopts a three-section telescopic design to facilitate the direct lifting of the container 2 from one vehicle to another parked parallel to it, saving transfer time. The vertical arm 32 adopts a two-section design; however, the telescopic stroke of the vertical arm 32 can be increased if the structural strength allows. In this embodiment, the container 2 is connected by the lifting head 34, and the container 2 can be lifted by the telescopic extension of the vertical arm 32. Then, the container 2 is rotated to the desired placement position by the planetary turntable mechanism 36, and the horizontal arm 33 is used for positioning to complete the lifting process.

[0047] In this embodiment, the lifting head 34 includes an upper mounting plate 342, a lower mounting plate 344, a plurality of telescopic mechanisms 341 for adjusting the relative distance and / or angle between the upper mounting plate 342 and the lower mounting plate 344, and a rotating mechanism 343 disposed on the lower mounting plate 344. The lower end of the rotating mechanism 343 is fixedly connected to a locking plate 345 for engaging the housing 2. The top of the housing 2 is provided with a lifting cover 4 that matches and engages with the locking plate 345.

[0048] In a further preferred embodiment, the cover 4 includes two symmetrically arranged cover bodies, with a space between the cover bodies for accommodating the card plate 345, and each cover body has a concave structure at its bottom. The concave structure and the top part of the box 2 form a space for accommodating the card plate 345, and the top of the concave structure is also provided with a fourth groove for accommodating a limiting plate 346. The limiting plate 346 is fixedly disposed on the upper surface of the card plate 345 near the end.

[0049] To ensure stability during hoisting and prevent accidents caused by the box 2 slipping, preferably, a contact-type limit switch is also provided on the limiting plate 346, lower than the upper surface of the limiting plate 346. The contact-type limit switch is connected in series with an indicator light located in the driver's cab of the vehicle body 1; the fourth groove has a protrusion that abuts against the contact-type limit switch. The advantage of using this contact-type limit switch is that when the operator sees the indicator light illuminate, it can be ensured that the limiting plate 346 is definitely located in the fourth groove. That is to say, the clamping plate 345 will not slip relative to the side under the mutual nesting and blocking effect of the limiting plate 346 and the fourth groove, thereby ensuring the stability of the box 2 during hoisting. As an improvement in this embodiment and application based on reliability and safety, if the limiting plate 346 is not aligned with the fourth groove, the protrusion and the contact-type limit switch cannot contact each other, so the contact-type limit switch will not be triggered, resulting in the indicator light not being lit. This serves as a reminder to the operator that the current lifting operation is not stable and requires manual verification to ensure that the lifting head 34 and the lifting cover 4 are correctly connected, as there may be a circuit fault in the indicator light causing it to not light up. If the indicator light is lit, it means that the lifting head 34 and the lifting cover 4 are fully connected and the lifting can be carried out with confidence. The advantage of this setting is that even if the indicator light does not light up due to a circuit fault after timely and correct connection, the lit state of the indicator light completely confirms that the lifting head 34 and the lifting cover 4 are in the correct state. In other words, as long as the lifting is carried out when the indicator light is lit, its stability and safety can be fully guaranteed.

[0050] To further enhance the stability between the box 2 and the vehicle body 1, preferably, a locking mechanism 5 is also provided between the vehicle body 1 and the box 2. The locking mechanism 5 includes a bracket 51 mounted on the vehicle body 1, with a screw 52 threadedly connected to the bracket 51. A threaded blind hole, threadedly connected to the screw 52, ​​is provided at a corresponding position on the side wall of the box 2. The square rail 63 is arranged longitudinally with the box 2, which can overcome the lateral and longitudinal shear forces generated by the vehicle body 1 during operation. Although the vehicle body 1 is usually equipped with a blocking structure to prevent slippage of the box 2 due to the failure of the fixing or locking fasteners, this protective structure is not subjected to force when the box 2 is normally fixed; it only serves a protective function. In order to prevent the axial force generated by the vehicle during acceleration or braking from impacting the steel ball 65 during transportation, the locking mechanism 5 between the box 3 and the vehicle body 1 can effectively counteract the axial force, thereby keeping the box 2 stationary during transportation and improving the stability and safety of the box 2.

[0051] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A two-box combined logistics transport vehicle, comprising a vehicle body (1), two boxes (2) placed on the vehicle body (1), wherein the bottom of any one of the boxes (2) is detachably and fixedly connected to the vehicle body (1) by a snap-fit ​​mechanism (6), characterized in that: The locking mechanism (6) includes a base plate (66) disposed at the bottom of any of the boxes (2), the base plate (66) having at least two parallel first grooves, a square rail (63) fixedly disposed on the vehicle body (1) to engage with the first grooves; and a boom (3) disposed on the vehicle body (1) between the two boxes (2) for lifting the boxes (2). The bottom of the square rail (63) is provided with a second groove along the length direction. The bottom of the second groove is also provided with a plurality of vertical clearance holes at intervals. The square rail (63) is also provided with a plurality of horizontal through holes (64). The number of through holes (64) corresponds one-to-one with the clearance holes and they are interconnected. It also includes a telescopic mechanism (61) fixedly installed on the vehicle body (1), a tongue plate (62) connected to the telescopic mechanism (61) and installed in the second groove, and a plurality of locking pins fixedly connected to the tongue plate (62) and slidably disposed in any through hole (64). Each locking pin includes a guide section and a columnar body section with a conical or wedge-shaped structure at the upper end, so that the locking pin can move up and down to push the plurality of steel balls (65) disposed in the through hole (64) to move horizontally left and right and form a locking with the third groove (67) disposed on both sides of the first groove.

2. The two-box combined logistics transport vehicle according to claim 1, characterized in that: The diameter of the limiting hole formed by the intersection of the outer wall of the square rail (63) and the through hole (64) is less than or equal to 80% of the diameter of the steel ball (65).

3. The two-box combined logistics transport vehicle according to claim 2, characterized in that: When the steel ball (65) near the locking pin contacts the columnar body section of the locking pin, the total gap width between all steel balls (65) in the same through hole 64 on the same side of the square rail (63) does not exceed 15% of the radius of the steel ball (65).

4. A two-box combined logistics transport vehicle according to any one of claims 1-3, characterized in that: The boom (3) includes a base (31) fixedly connected to the vehicle body (1). The base (31) is rotatably engaged with a telescopic vertical arm (32), and a planetary turntable mechanism (36) is provided inside the base (31). The output end of the planetary turntable mechanism (36) is connected to the vertical arm (32). A telescopic horizontal arm (33) is hinged to the upper end of the vertical arm (32), and a lifting head (34) for engaging with the box body (2) is provided at one end of the horizontal arm (33).

5. A two-box combined logistics transport vehicle according to claim 4, characterized in that: The lifting head (34) includes an upper mounting plate (342), a lower mounting plate (344), multiple telescopic mechanisms (341) for adjusting the relative distance and / or angle between the upper mounting plate (342) and the lower mounting plate (344), and a rotating mechanism (343) disposed on the lower mounting plate (344). The lower end of the rotating mechanism (343) is fixedly connected to a locking plate (345) for engaging the box body (2). The top of the box body (2) is provided with a lifting cover (4) that matches and engages with the locking plate (345).

6. A two-box combined logistics transport vehicle according to claim 5, characterized in that: The hanging cover (4) includes two symmetrically arranged cover bodies, with a space between the cover bodies for accommodating the card plate (345), and a concave structure at the bottom of each cover body. The concave structure and the top part of the box (2) form a space for accommodating the card plate (345), and a fourth groove for accommodating the limiting plate (346) is also provided at the top of the concave structure. The limiting plate (346) is fixedly arranged on the upper surface of the card plate (345) near the end.

7. A two-box combined logistics transport vehicle according to claim 6, characterized in that: The limiting plate (346) is also provided with a contact-type limit switch that is lower than the upper surface of the limiting plate (346), and the contact-type limit switch is connected in series with the indicator light provided in the driver's cab of the vehicle body (1).

8. A two-box combined logistics transport vehicle according to any one of claims 1-3 and 5-7, characterized in that: A locking mechanism (5) is also provided between the vehicle body (1) and the box body (2). The locking mechanism (5) includes a bracket (51) provided on the vehicle body (1). A screw (52) is threadedly connected to the bracket (51). A threaded blind hole that is threadedly connected to the screw (52) is provided at a corresponding position on the side wall of the box body (2).

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