Split type box body mounting bracket and method for container of van

By designing the structure of the connecting frame, fixed plate and movable movable plate in the installation bracket of the van cargo box, the problem of cumbersome and insufficient stability of the connection between the cargo box and the truck in the prior art is solved, and a more efficient and stable connection between the cargo box and the truck is achieved.

CN119975564AInactive Publication Date: 2025-05-13DANYANG SHENGRUI MOLDING CO LTD
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Patent Information

Application Number
CN202510407821.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-02
Publication Date
2025-05-13
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The connection between the existing van cargo box and the split box is complicated and has insufficient stability, resulting in the box being easily vibrated during transportation.

Method used

A split-type box mounting bracket is designed. By setting a connecting frame under the cargo box body, a fixed plate is installed on the truck chassis, and a movable movable plate and a plug plate are set between the positioning plates. The movable plate is driven by a motor to move, so that the plug plate is inserted into the fixing slot, thereby achieving a stable connection between the cargo box body and the truck chassis.

Benefits of technology

It improves the connection stability and installation efficiency between the cargo box body and the truck chassis, ensures that the cargo box reduces vibration during transportation, and enhances the transportation safety of goods.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a split type box body installation support and method for a van cargo box, and belongs to the technical field of van cargo box installation. According to the split type box body installation support and method for the van cargo box, the split type box body installation support comprises a cargo box body and further comprises a fixing plate, the cargo box body is located above the fixing plate, a connecting frame is arranged below the cargo box body, the lower portion of the fixing plate is connected with a truck chassis, and a positioning plate is arranged on the upper portion of the fixing plate. In order to solve the problems that connection and installation of a truck and a container body are tedious, and stability is insufficient, a connecting frame is arranged below a container body, a fixing plate is installed on a truck chassis, and two positioning plates are installed on the fixing plate; the motor drives the first movable plate and the second movable plate to move towards the two ends of the positioning plate correspondingly, the inserting plates are inserted into the fixing grooves, then the container body is connected with the truck chassis, and the mounting efficiency is improved.
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Description

Technical Field

[0001] The present invention relates to the technical field of van cargo box installation, and in particular to a split box installation bracket and method for a van cargo box. Background Art

[0002] The cargo box of a van is a completely enclosed space, consisting of a box body, doors and other parts. This design can effectively protect the goods from the influence of the external environment, such as rain, wind, sand, dust, etc., ensuring the safety and cleanliness of the goods during transportation. This is the most common form of door, which is convenient for loading and unloading of goods, especially when the goods enter and exit from the rear end of the cargo box. The rear door can be a single door or double door design. The double door design can further improve the loading and unloading efficiency. In order to ensure the stability of the goods during transportation, the interior of the van cargo box is usually equipped with various fixing devices, such as hooks, straps, fixed slots, etc., which can firmly fix the goods in the cargo box to prevent the goods from displacement and collision during driving.

[0003] The truck and the split box body are generally installed by means of snaps or by pre-setting connectors on the box body, but the snap connection is not stable enough. After the preset connectors on the box body are connected to the truck, the gap between the box body and the truck is large, and the box body is prone to severe vibration during transportation. As a result, the above method has the problems of cumbersome installation and connection between the truck and the cargo box body and insufficient stability. Therefore, it does not meet the existing needs. In this regard, the present application proposes a split box installation bracket and method for a van cargo box. Summary of the invention

[0004] The object of the present invention is to provide a split box mounting bracket and method for a van cargo box, by arranging a connecting frame under the cargo box body, installing a fixing plate on the truck chassis, and installing two positioning plates on the fixing plate. When the two positioning plates are both located inside the connecting frame, a motor drives the first movable plate and the second movable plate to move to the two ends of the positioning plate respectively, so that the plug plate is inserted into the inside of the fixing groove, thereby connecting the cargo box body to the truck chassis, thereby improving the installation efficiency and solving the problems in the prior art.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a split box mounting bracket for a van cargo box, comprising a cargo box body and a fixed plate, the cargo box body being located above the fixed plate, a connecting frame being arranged below the cargo box body, the fixed plate being connected to the truck chassis below, a positioning plate being arranged above the fixed plate, a first movable plate, a second movable plate, a cross bar, an upper screw rod, a transmission shaft and a lower screw rod being arranged between the two positioning plates, a top plate being arranged above the two positioning plates, a motor being arranged on the side of the cross bar, an upper opening and closing rod being arranged on one side of the upper screw rod, and a lower opening and closing rod being arranged on one side of the lower screw rod.

[0006] Preferably, an installation groove is provided inside the connecting frame, and the two positioning plates and the top plate are all located inside the installation groove. An inclined surface and a fixing groove are provided on the inner wall of the installation groove. A guide surface is provided on the side of the positioning plate, and the inclined surface and the guide surface are fitted together. The cross-section of the positioning plate is a right-angled trapezoid.

[0007] Preferably, the inner bottom surface of the cargo box body is provided with a plurality of positioning holes, and the interior of the top plate is provided with a plurality of screw holes, and the screws extend through the positioning holes to the interior of the screw holes.

[0008] Preferably, a first plug plate is provided on one side of the first movable plate, a first guide column is provided on the other side of the first movable plate, a second plug plate is provided on one side of the second movable plate, a second guide column is provided on the other side of the second movable plate, guide sleeves are provided at both ends of the side surface of the single positioning plate, and the first guide column and the second guide column are respectively located inside the guide sleeves at both ends of the positioning plate.

[0009] Preferably, both ends of the upper screw rod, the transmission shaft and the lower screw rod are connected to the positioning plate through bearings, the transmission shaft is located between the upper screw rod and the lower screw rod, the side of the upper screw rod is provided with a left-handed threaded wall, the side of the lower screw rod is provided with a right-handed threaded wall, and the two ends of the cross bar are respectively connected to the two positioning plates.

[0010] Preferably, an upper gear is provided at one end of the upper screw rod, and an upper stopper is provided at the other end of the upper screw rod. The upper opening and closing rod is composed of two support rods and an upper sliding seat. The upper sliding seat is installed on the upper screw rod, and the two ends of the first support rod are respectively connected to the upper sliding seat and the first movable plate shaft, and the two ends of the second support rod are respectively connected to the upper sliding seat and the second movable plate shaft.

[0011] Preferably, a lower gear is provided at one end of the lower screw rod, and a lower stopper is provided at the other end of the lower screw rod. The lower opening and closing rod is composed of two support rods and a lower sliding seat. The lower sliding seat is installed on the lower screw rod, and the two ends of the first support rod are respectively connected to the lower sliding seat and the first movable plate shaft, and the two ends of the second support rod are respectively connected to the lower sliding seat and the second movable plate shaft.

[0012] Preferably, a first gear and a second gear are respectively provided at both ends of the transmission shaft, a transmission gear is provided in the middle of the transmission shaft, and a power gear is provided on one side of the motor, and the power gear is connected to the motor shaft.

[0013] Preferably, the first gear is meshed with the upper gear, the second gear is meshed with the lower gear, the power gear is meshed with the transmission gear, and both the power gear and the transmission gear are bevel gears.

[0014] A method for using a split box mounting bracket for a van cargo box is implemented based on a split box mounting bracket for a van cargo box, and includes the following steps:

[0015] Step 1: After the fixing plate is installed on the truck chassis, the personnel use the crane to lift the cargo box body to the top of the fixing plate, and then slowly lower the cargo box body until both positioning plates are located inside the connecting frame;

[0016] Step 2: The personnel starts the motor, the power gear drives the transmission shaft to rotate, and the transmission shaft drives the upper screw rod and the lower screw rod to rotate at the same time, so that the upper opening and closing rod and the lower opening and closing rod are opened at the same time, and the first movable plate and the second movable plate move to the two ends of the positioning plate respectively, until the first plug plate and the second plug plate are respectively inserted into the two fixed grooves;

[0017] Step three, after the first plug plate and the second plug plate are fully inserted into the two fixing grooves respectively, the position of the cargo box body is fixed. At this time, the personnel enter the interior of the cargo box body and completely fix the position of the cargo box body by screwing the screws through the positioning holes and extending into the screw holes, so that the cargo box body can be installed on the truck chassis.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention arranges a connecting frame under the cargo box body, installs a fixing plate on the truck chassis, two positioning plates are installed on the fixing plate, and a movable first movable plate and a second movable plate are arranged between the two positioning plates. After a person controls the cargo box body to be slowly lowered by a crane until the two positioning plates are both located inside the connecting frame, a motor drives the first movable plate and the second movable plate to move to the two ends of the positioning plates respectively, so that the plug plate is inserted into the inside of the fixing groove, thereby connecting the cargo box body to the truck chassis. After that, a person enters the interior of the cargo box body and passes the screws through the positioning holes and extend them into the screw holes, so that the position of the cargo box body is completely fixed, thereby improving the stability of the connection between the cargo box body and the truck chassis.

[0020] 2. The present invention arranges an upper screw rod, a transmission shaft and a lower screw rod between two positioning plates. After the two positioning plates are located inside the connecting frame, a person starts the motor, and the motor drives the transmission shaft to rotate through the power gear. The first gear and the second gear at both ends of the transmission shaft then drive the upper screw rod and the lower screw rod to rotate at the same time, so that the upper sliding seat and the lower sliding seat move along the upper screw rod and the lower screw rod respectively at the same time, and then the upper opening and closing rod and the lower opening and closing rod are opened at the same time, thereby driving the first movable plate and the second movable plate to move toward the two ends of the positioning plates respectively, until the first plug plate and the second plug plate are respectively inserted into the two fixing grooves, so that the initial connection between the cargo box body and the truck chassis can be quickly completed, thereby improving the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an overall schematic diagram of the present invention;

[0022] Figure 2It is a schematic diagram of the local structure of the top plate of the present invention;

[0023] Figure 3 It is a schematic diagram of the local structure of the connecting frame of the present invention;

[0024] Figure 4 It is a schematic diagram of the local structure of the positioning plate of the present invention;

[0025] Figure 5 It is a schematic diagram of the local structure of the transmission shaft of the present invention.

[0026] In the figure: 1, cargo box body; 101, connecting frame; 102, positioning hole; 103, fixing groove; 104, inclined surface; 2, fixing plate; 3, truck chassis; 4, top plate; 401, screw hole; 402, positioning plate; 403, guide sleeve; 404, guide surface; 5, first movable plate; 501, first plug plate; 502, first guide column; 503, second movable plate; 504, second plug plate; 505, The second guide column; 6. the cross bar; 601. the motor; 602. the power gear; 7. the upper screw rod; 701. the upper gear; 702. the upper stopper; 703. the upper sliding seat; 704. the upper opening and closing rod; 8. the transmission shaft; 801. the first gear; 802. the second gear; 803. the transmission gear; 9. the lower screw rod; 901. the lower gear; 902. the lower sliding seat; 903. the lower stopper; 904. the lower opening and closing rod. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In order to solve the problem of cumbersome installation and insufficient stability of the connection between the truck and the cargo box, please refer to Figure 1-4 , this embodiment provides the following technical solutions:

[0029] A split box mounting bracket for a van cargo box includes a cargo box body 1 and a fixing plate 2. The cargo box body 1 is located above the fixing plate 2. A connecting frame 101 is arranged below the cargo box body 1. The fixing plate 2 is connected to the truck chassis 3 at its bottom. A positioning plate 402 is arranged above the fixing plate 2. A first movable plate 5, a second movable plate 503, a cross bar 6, an upper screw rod 7, a transmission shaft 8 and a lower screw rod 9 are arranged between the two positioning plates 402. A top plate 4 is arranged above the two positioning plates 402. A motor 601 is arranged on the side of the cross bar 6. An upper opening and closing rod 704 is arranged on one side of the upper screw rod 7. A lower opening and closing rod 904 is arranged on one side of the lower screw rod 9.

[0030] A first plug plate 501 is provided on one side of the first movable plate 5, a first guide column 502 is provided on the other side of the first movable plate 5, a second plug plate 504 is provided on one side of the second movable plate 503, a second guide column 505 is provided on the other side of the second movable plate 503, guide sleeves 403 are provided at both ends of the side of the single positioning plate 402, and the first guide column 502 and the second guide column 505 are respectively located inside the guide sleeves 403 at both ends of the positioning plate 402.

[0031] The upper screw rod 7, the transmission shaft 8 and the lower screw rod 9 are connected to the positioning plate 402 at both ends through bearings. The transmission shaft 8 is located between the upper screw rod 7 and the lower screw rod 9. The side of the upper screw rod 7 is provided with a left-handed thread wall, and the side of the lower screw rod 9 is provided with a right-handed thread wall. The two ends of the cross bar 6 are respectively connected to the two positioning plates 402. One end of the upper screw rod 7 is provided with an upper gear 701, and the other end of the upper screw rod 7 is provided with an upper stopper 702. The upper opening and closing rod 704 is composed of two support rods and an upper sliding seat 703. The upper sliding seat 703 is installed on the upper screw rod 7. The two ends of the first support rod are respectively connected to the upper sliding seat 703 and the first movable plate 5 axis, and the two ends of the second support rod are respectively connected to the upper sliding seat 703 and the second movable plate 503 axis. One end of the lower screw rod 9 is provided with a lower gear 901, and the other end of the lower screw rod 9 is provided with There is a lower stopper 903, and the lower opening and closing rod 904 is composed of two support rods and a lower sliding seat 902. The lower sliding seat 902 is installed on the lower screw rod 9, and the two ends of the first support rod are respectively connected to the lower sliding seat 902 and the first movable plate 5 axis, and the two ends of the second support rod are respectively connected to the lower sliding seat 902 and the second movable plate 503 axis. The two ends of the transmission shaft 8 are respectively provided with a first gear 801 and a second gear 802, and the middle part of the transmission shaft 8 is provided with a transmission gear 803. A power gear 602 is provided on one side of the motor 601, and the power gear 602 is connected to the motor 601 axis. The first gear 801 is meshed with the upper gear 701, the second gear 802 is meshed with the lower gear 901, the power gear 602 is meshed with the transmission gear 803, and the power gear 602 and the transmission gear 803 are both bevel gears.

[0032] An installation groove is provided inside the connecting frame 101, and the two positioning plates 402 and the top plate 4 are all located inside the installation groove. An inclined surface 104 and a fixing groove 103 are provided on the inner wall of the installation groove. A guide surface 404 is provided on the side of the positioning plate 402, and the inclined surface 104 and the guide surface 404 are in contact with each other. The cross-section of the positioning plate 402 is a right-angled trapezoid. A plurality of positioning holes 102 are provided on the inner bottom surface of the cargo box body 1, and a plurality of screw holes 401 are provided inside the top plate 4. The screws pass through the positioning holes 102 and extend to the inside of the screw holes 401.

[0033] After the personnel use the crane to control the cargo box body 1 to slowly lower it until the two positioning plates 402 are both located inside the connecting frame 101, the motor 601 drives the first movable plate 5 and the second movable plate 503 to move to the two ends of the positioning plate 402 respectively, so that the first plug plate 501 and the second plug plate 504 are respectively inserted into the two fixing grooves 103, thereby connecting the cargo box body 1 to the truck chassis 3. After that, the personnel enter the interior of the cargo box body 1 and screw through the positioning holes 102 to the inside of the screw holes 401, so that the position of the cargo box body 1 is completely fixed, thereby improving the stability of the connection between the cargo box body 1 and the truck chassis 3.

[0034] After both positioning plates 402 are located inside the connecting frame 101, the personnel starts the motor 601, and the motor 601 drives the transmission shaft 8 to rotate through the power gear 602. The first gear 801 and the second gear 802 at both ends of the transmission shaft 8 then simultaneously drive the upper screw rod 7 and the lower screw rod 9 to rotate, so that the upper sliding seat 703 and the lower sliding seat 902 move along the upper screw rod 7 and the lower screw rod 9 respectively at the same time, thereby making the upper opening and closing rod 704 and the lower opening and closing rod 904 open at the same time, thereby driving the first movable plate 5 and the second movable plate 503 to move toward the two ends of the positioning plate 402 respectively, until the first plug plate 501 and the second plug plate 504 are respectively inserted into the two fixing grooves 103, the preliminary connection between the cargo box body 1 and the truck chassis 3 can be quickly completed. At the same time, when the first plug plate 501 and the second plug plate 504 are fully inserted into the fixing groove 103, the preliminary positioning of the cargo box body 1 can be achieved, which is convenient for the subsequent connection of the cargo box body 1 and the top plate 4 by screws, further improving the installation efficiency.

[0035] A method for using a split box mounting bracket for a van cargo box is implemented based on a split box mounting bracket for a van cargo box, and includes the following steps:

[0036] Step 1: After the fixing plate 2 is installed on the truck chassis 3, the personnel use a crane to lift the cargo box body 1 to the top of the fixing plate 2, and then slowly lower the cargo box body 1 until the two positioning plates 402 are both located inside the connecting frame 101;

[0037] Step 2: The personnel starts the motor 601, the power gear 602 drives the transmission shaft 8 to rotate, and the transmission shaft 8 drives the upper screw rod 7 and the lower screw rod 9 to rotate at the same time, so that the upper opening and closing rod 704 and the lower opening and closing rod 904 are opened at the same time, and the first movable plate 5 and the second movable plate 503 move to the two ends of the positioning plate 402 respectively, until the first plug plate 501 and the second plug plate 504 are respectively inserted into the two fixing grooves 103;

[0038] Step three, after the first plug plate 501 and the second plug plate 504 are fully inserted into the two fixing grooves 103 respectively, the position of the cargo box body 1 is fixed. At this time, the personnel enter the interior of the cargo box body 1 and completely fix the position of the cargo box body 1 by screwing the screws through the positioning holes 102 to the inside of the screw holes 401, so that the cargo box body 1 is installed on the truck chassis 3.

[0039] Working principle: After the personnel control the cargo box body 1 to slowly lower it through the crane until the two positioning plates 402 are both located inside the connecting frame 101, the motor 601 drives the first movable plate 5 and the second movable plate 503 to move to the two ends of the positioning plate 402 respectively, so that the first plug plate 501 and the second plug plate 504 are respectively inserted into the two fixing grooves 103, thereby preliminarily connecting the cargo box body 1 with the truck chassis 3. After that, the personnel enter the interior of the cargo box body 1 and screw through the positioning hole 102 to the inside of the screw hole 401, so that the position of the cargo box body 1 is completely fixed, thereby improving the installation efficiency and the stability of the cargo box body 1 after installation.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A split box mounting bracket for a van cargo box, comprising a cargo box body (1), characterized in that: The invention also comprises a fixed plate (2), wherein the cargo box body (1) is located above the fixed plate (2), a connecting frame (101) is arranged below the cargo box body (1), the fixed plate (2) is connected to the truck chassis (3) below, a positioning plate (402) is arranged above the fixed plate (2), a first movable plate (5), a second movable plate (503), a cross bar (6), an upper screw rod (7), a transmission shaft (8) and a lower screw rod (9) are arranged between the two positioning plates (402), a top plate (4) is arranged above the two positioning plates (402), a motor (601) is arranged on the side of the cross bar (6), an upper opening and closing rod (704) is arranged on one side of the upper screw rod (7), and a lower opening and closing rod (904) is arranged on one side of the lower screw rod (9).

2. The split box mounting bracket for a van cargo box according to claim 1, characterized in that: The connection frame (101) is provided with a mounting groove inside, the two positioning plates (402) and the top plate (4) are all located inside the mounting groove, an inclined surface (104) and a fixing groove (103) are provided on the inner wall of the mounting groove, a guide surface (404) is provided on the side of the positioning plate (402), the inclined surface (104) and the guide surface (404) are in contact with each other, and the cross section of the positioning plate (402) is a right-angled trapezoid.

3. The split box mounting bracket for a van cargo box according to claim 1, characterized in that: The inner bottom surface of the cargo box body (1) is provided with a plurality of positioning holes (102), and the interior of the top plate (4) is provided with a plurality of screw holes (401), and the screws pass through the positioning holes (102) and extend to the interior of the screw holes (401).

4. The split box mounting bracket for a van cargo box according to claim 1, characterized in that: A first plug plate (501) is provided on one side of the first movable plate (5), a first guide column (502) is provided on the other side of the first movable plate (5), a second plug plate (504) is provided on one side of the second movable plate (503), a second guide column (505) is provided on the other side of the second movable plate (503), guide sleeves (403) are provided at both ends of the side of the single positioning plate (402), and the first guide column (502) and the second guide column (505) are respectively located inside the guide sleeves (403) at both ends of the positioning plate (402).

5. The split box mounting bracket for a van cargo box according to claim 1, characterized in that: Both ends of the upper screw rod (7), the transmission shaft (8) and the lower screw rod (9) are connected to the positioning plate (402) through bearings. The transmission shaft (8) is located between the upper screw rod (7) and the lower screw rod (9). The side surface of the upper screw rod (7) is provided with a left-handed thread wall, and the side surface of the lower screw rod (9) is provided with a right-handed thread wall. The two ends of the cross bar (6) are respectively connected to the two positioning plates (402).

6. The split box mounting bracket for a van cargo box according to claim 1, characterized in that: An upper gear (701) is provided at one end of the upper screw rod (7), and an upper stopper (702) is provided at the other end of the upper screw rod (7). The upper opening and closing rod (704) is composed of two support rods and an upper sliding seat (703). The upper sliding seat (703) is installed on the upper screw rod (7), and the two ends of the first support rod are respectively connected to the upper sliding seat (703) and the first movable plate (5) axis, and the two ends of the second support rod are respectively connected to the upper sliding seat (703) and the second movable plate (503) axis.

7. The split box mounting bracket for a van cargo box according to claim 1, characterized in that: A lower gear (901) is provided at one end of the lower screw rod (9), and a lower stopper (903) is provided at the other end of the lower screw rod (9). The lower opening and closing rod (904) is composed of two support rods and a lower sliding seat (902). The lower sliding seat (902) is installed on the lower screw rod (9), and the two ends of the first support rod are respectively connected to the lower sliding seat (902) and the first movable plate (5) axis, and the two ends of the second support rod are respectively connected to the lower sliding seat (902) and the second movable plate (503) axis.

8. The split box mounting bracket for a van cargo box according to claim 1, characterized in that: The two ends of the transmission shaft (8) are respectively provided with a first gear (801) and a second gear (802), the middle part of the transmission shaft (8) is provided with a transmission gear (803), and one side of the motor (601) is provided with a power gear (602), and the power gear (602) is connected to the shaft of the motor (601).

9. The split box mounting bracket for a van cargo box according to claim 8, characterized in that: The first gear (801) is meshed with the upper gear (701), the second gear (802) is meshed with the lower gear (901), the power gear (602) is meshed with the transmission gear (803), and both the power gear (602) and the transmission gear (803) are bevel gears.

10. A method for using a split box mounting bracket for a van cargo box, which is implemented based on the split box mounting bracket for a van cargo box according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: After the fixing plate (2) is installed on the truck chassis (3), the personnel use a crane to lift the cargo box body (1) to the top of the fixing plate (2), and then slowly lower the cargo box body (1) until the two positioning plates (402) are both located inside the connecting frame (101); Step 2: A person starts the motor (601), and the power gear (602) drives the transmission shaft (8) to rotate, and the transmission shaft (8) then drives the upper screw rod (7) and the lower screw rod (9) to rotate at the same time, so that the upper opening and closing rod (704) and the lower opening and closing rod (904) are opened at the same time, and the first movable plate (5) and the second movable plate (503) are respectively moved to the two ends of the positioning plate (402) until the first plug plate (501) and the second plug plate (504) are respectively inserted into the inside of the two fixing grooves (103); Step 3: After the first plug plate (501) and the second plug plate (504) are completely inserted into the two fixing grooves (103), the position of the cargo box body (1) is fixed. At this time, a person enters the interior of the cargo box body (1) and completely fixes the position of the cargo box body (1) by screwing the screws through the positioning holes (102) and extending into the screw holes (401), thereby allowing the cargo box body (1) to be installed on the truck chassis (3).