Carriage body lifting device

Abstract

A lifting device for a compartment body belongs to the technical field of compartment body lifting and comprises the compartment body, a support for lifting the compartment body and a lifting mechanism for expanding the compartment body. The carriage box body comprises a main box body, an expansion module and a roof; the support for lifting the carriage body comprises a supporting leg frame fixedly installed on the main box body, a control panel rotationally installed on the supporting leg frame, a control gear, a thorn wheel, a pawl meshed with the thorn wheel, a supporting leg installed on the supporting leg frame in a sliding mode and a turnover fixing mechanism installed on the supporting leg, wherein the control gear and the thorn wheel are installed on a shaft arranged on the control panel and arranged in sequence. The lifting mechanism of the expansion compartment body comprises a supporting frame fixedly installed on the outer wall of the main compartment body, a shear fork type lifting rod slidably connected with the supporting frame, a double-connecting-rod II rotationally connected with the supporting frame, and a connecting assembly rotationally connected with the double-connecting-rod II and matched with the double-connecting-rod II. The manual power assembly, the electric power assembly, the lead screw I, the lead screw II and the lead screw III are used for opening the capacity expansion module.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of carriage box lifting, in particular to a lifting device of carriage box. BACKGROUND

[0002] In today's era of booming tourism demand, RV travel has become an ideal travel method for more and more people due to its unique freedom and flexibility. It allows people to explore unknown beauty at will and enjoy the pleasure of close contact with nature. However, the high price of RVs has become an obstacle for many people to realize this dream. In order to break this dilemma, some manufacturers have ingeniously launched a carriage box solution that can be installed in small vans and pickup truck beds.

[0003] These carriage boxes are designed with full consideration of practicality and convenience. They not only quickly transform into a comfortable resting space when needed, but also easily integrate with the vehicle, making it convenient for travelers to set off at any time. In order to balance the need to pass through height-limited sections and improve the comfort of the interior space, manufacturers have designed an expansion module. This module can cleverly expand the interior space during rest periods, providing travelers with a more spacious and comfortable resting environment.

[0004] However, despite the creativity and practicality of these carriage boxes in design, there are some problems with the expansion modules on the current market that cannot be ignored. Most expansion modules rely on double-link mechanisms for lifting operation, and this design is particularly vulnerable in strong wind weather. When the wind is too strong, the expansion module is prone to sway, affecting the rest experience of the people inside the vehicle, and may even pose a safety hazard. In addition, the support method of the support rod used during installation also increases the difficulty of installing the carriage box into the truck bed. After completing the installation, the vehicle owner needs to take additional steps to remove the support rod and secure the carriage box through other complex mechanisms. The entire process is cumbersome and time-consuming, requiring a lot of manpower and professional equipment assistance. This not only affects the convenience of the vehicle owner to quickly install and remove the carriage box, but also increases the cost and inconvenience of travel. SUMMARY

[0005] To solve the above problems, the utility model provides a lifting device of carriage box to solve the above shortcomings of the existing equipment.

[0006] The utility model discloses a lifting device of carriage box body, including carriage box body, the support of lifting carriage box body and the lifting mechanism of expansion carriage box body, the carriage box body includes main box, expansion module and roof, expansion module connects main box with roof, and expansion module is made of soft material, the support of lifting carriage box body includes the support leg frame of fixed mounting in the recess of four corners of main box middle, the control disc of rotation installation with support leg frame, the control gear and thorn wheel of arranging in order and being installed on the shaft of control disc and being equipped with, the pawl of engagement with thorn wheel, the support leg of sliding installation with support leg frame and the turnover fixed establishment of installation on support leg, the turnover fixed establishment includes the slide bar of sliding installation with small slide hole on support leg frame, the ladder bar of being connected with the lower end of slide bar through the connecting plate and being used for controlling the rotation of connecting block, the rotation connecting block of rotation installation with support leg, small support leg of rotation installation with rotation connecting block and connecting sleeve ring and small support leg and the double connecting rod I of pushing small support leg turnover, the lifting mechanism of expansion carriage box body includes the support frame of fixed installation on the outer wall of main box and surrounding main box a week, the scissor type lifting rod of sliding connection with support frame, the double connecting rod II of rotation connection with support frame, the connecting assembly of rotation connection with double connecting rod II and mutual cooperation and the manual power assembly, electric power assembly, screw rod I, screw rod II and screw rod III for opening expansion module.

[0007] Preferably, the lower part of the outer wall of the support leg is provided with a circular sliding groove, and three vertical sliding grooves arranged in a circular array are arranged below the circular sliding groove; the upper end of the vertical sliding groove is connected with the circular sliding groove, and the lower end of the vertical sliding groove does not exceed the bottom end of the support leg.

[0008] Preferably, the inner wall of the sleeve ring is provided with three small lugs arranged in a circular array corresponding to the vertical sliding grooves, which present a ninety-degree angle with the corresponding vertical sliding groove in the initial position, and the small lugs are slidingly installed in the circular sliding groove; during the fixing process of the turnover fixing mechanism, the small lugs slide into the vertical sliding grooves; the end of the sleeve ring opposite to the double connecting rod I is provided with a large lug, and pressing the large lug can drive the whole sleeve ring to move.

[0009] Preferably, the universal wheel is installed below the small support leg, and the lifting support of the carriage box body has four, which are fixedly installed at the middle positions of the four corners of the main box to support the carriage box body.

[0010] Preferably, the spring wrapped outside the slide bar has a greater elastic force than the force required for the ladder bar to push the rotating connecting block to rotate.

[0011] Preferably, the scissor lifting rods are two, arranged in mirror symmetry, and each of the scissor lifting rods is provided with corresponding double connecting rods II and connecting assemblies on both sides; the two ends of the lower end of the scissor lifting rod are connected with the two ends of the screw rod II respectively, and the upper end of the scissor lifting rod is slidably installed in the sliding groove provided at the edge of the roof; the upper ends of the four double connecting rods II are rotatably installed at the four corner positions of the roof for firmly supporting the roof; the lower part of the connecting assembly on the left side of the scissor lifting rod is threadedly connected with the screw rod I, and the lower part of the connecting assembly on the right side of the scissor lifting rod is threadedly connected with the screw rod III.

[0012] Preferably, the screw rod I, the screw rod II and the screw rod III are rotatably connected with the support frame; the two ends of the screw rod II are fixedly installed with the screw rod I and the screw rod III respectively; the screw rod I and the screw rod III are opposite in screw direction, and drive the connecting assembly installed on the screw rod I and the connecting assembly installed on the screw rod III to move in opposite directions; the screw rods provided on the two sides of the screw rod II are opposite in screw direction, and drive the scissor lifting rod to open and close.

[0013] Preferably, the manual power assembly is composed of a plurality of bevel gears and shafts for transmitting power, and power is transmitted to the two screw rods I through the transmission mechanism composed of the remaining bevel gears and shafts by rotating one of the bevel gears manually, so as to drive the two screw rods I to rotate manually; the electric power assembly is composed of a motor, a plurality of bevel gears and shafts for transmitting power, and power is transmitted to the two screw rods III through the remaining bevel gears and shafts by rotating one of the bevel gears driven by the motor, so as to drive the two screw rods III to rotate by the motor.

[0014] The utility model discloses the beneficial effect:

[0015] 1. A plurality of double connecting rods II and a plurality of scissor lifting rods can firmly support the roof, avoid the roof from shaking due to the action of wind force, and affect the living experience of the people in the carriage box body;

[0016] 2. Rotating the control disc to drive the supporting legs to move, and then rotating the small supporting leg by ninety degrees around the shaft provided at the lower end of the rotating connecting block, so as to fix the carriage box body and the car body, and also can move reversely to separate the carriage box body from the car body and take the carriage box body off the car body, which is convenient for the owner to quickly install and disassemble the carriage box body;

[0017] 3. When the expansion module needs to be opened, the scissor lifting rod can be opened manually or electrically, so as to open the expansion module. DRAWINGS

[0018] Figure 1 It is a first angle schematic view of the overall structure of the utility model.

[0019] Figure 2 It is the schematic view of the second angle of the whole structure of the utility model.

[0020] Figure 3 It is the schematic view of the second angle of the whole structure of the utility model.

[0021] Figure 4 It is the schematic view of the lifting mechanism of the expansion carriage box body of the utility model.

[0022] Figure 5 It is the schematic view of the lifting mechanism of the expansion carriage box body of the utility model.

[0023] Figure 6 It is the schematic view of the lifting carriage box body support of the utility model.

[0024] Figure 7 It is the schematic view of the upper structure of the lifting carriage box body support of the utility model.

[0025] Figure 8 It is the schematic view of the upper part of the support of the utility model.

[0026] Figure 9 It is the schematic view of the middle part of the support of the utility model.

[0027] Figure 10 It is the schematic view of the Figure 9 It is the schematic view of the section structure of A-A.

[0028] Figure 11 It is the schematic view of the support leg, sliding rod, circular ring sliding groove and vertical sliding groove of the utility model.

[0029] Figure 12 It is the schematic view of the sliding rod, ladder rod and rotating connecting block of the utility model.

[0030] Figure 13 It is the schematic view of the sleeve ring of the utility model.

[0031] Fig. 1, main box body; 2, expansion module; 3, roof; 4, support leg frame; 5, control disc; 6, control gear; 7, ratchet wheel; 8, pawl; 9, support leg; 10, sliding rod; 11, ladder rod; 12, sleeve ring; 13, double connecting rod I; 14, rotating connecting block; 15, small support leg; 16, universal wheel; 17, support frame; 18, scissor lifting rod; 19, double connecting rod II; 20, connecting assembly; 21, manual power assembly; 22, electric power assembly; 23, screw I; 24, screw II; 25, screw III; 26, circular ring sliding groove; 27, vertical sliding groove. DETAILED DESCRIPTION

[0032] The technical scheme of the utility model will be further explained in detail below with reference to the embodiments and the drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0033] In the description of the utility model, it should be pointed out that the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right" and the like is based on the orientation or position relationship shown in the drawings or the orientation or position relationship in which the utility model product is usually placed, which is only a simplified description for the convenience of describing the utility model patent, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the utility model patent. In addition, spatial relative terms can be used in the text for the convenience of description, for example, "below", "following", "lower", "above", "upper" and the like, to describe the relationship of one element or feature with respect to other elements or features as shown in the drawings. The spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation shown in the drawings. The device can have other orientations (rotated by 90 degrees or in other orientations), and the spatial relative terms used in the text can also be interpreted accordingly. It should be noted that in this text, some connection methods such as "fixed connection, fixed installation" refer to the fixing of two parts, including but not limited to, such as: welding, screw nut fixing, sticking, riveting, interference fit and the like. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0034] In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0035] The embodiments are as shown in the drawings Figure 1 , Figure 2 As shown in the drawings, a lifting device of a carriage box body includes a carriage box body, a support for lifting the carriage box body and a lifting mechanism for expanding the carriage box body; the carriage box body includes a main box body 1, an expansion module 2 and a roof 3; the expansion module 2 connects the main box body 1 and the roof 3, the expansion module 2 is made of soft material and can be stretched, and after the expansion module 2 is stretched, the space inside the carriage box body can be effectively expanded, so that people have a more comfortable living experience.

[0036] As Figure 1 , Figure 2 shown, the lifting carriage box support has four, respectively fixedly installed in the middle position of the four corners of the main box 1, supports the carriage box, and can drive the carriage box to move through the universal wheel 16, and can fix the carriage box on the car hopper through the turnover fixing mechanism.

[0037] As Figures 6-11 shown, the lifting carriage box support includes: a support leg frame 4, a control disc 5, a control gear 6, a ratchet wheel 7, a pawl 8, a support leg 9, a universal wheel 16, a circular ring sliding groove 26, a vertical sliding groove 27, and a turnover fixing mechanism; four support leg frames 4 are respectively fixedly installed in the grooves in the middle of the four corners of the main box 1, and a large sliding hole and a small sliding hole are provided on the support leg frame 4; a shaft is provided on the inner side of the control disc 5, which is rotationally connected with the support leg frame 4, the control gear 6 is installed on the shaft provided on the control disc 5, the ratchet wheel 7 is installed on the shaft provided on the control disc 5, and the control gear 6 and the ratchet wheel 7 are arranged in sequence; the pawl 8 engages with the ratchet wheel 7, and the ratchet wheel 7 is limited from being reversed by the pawl 8, avoiding reverse rotation of the control gear 6; a pull rod is provided outside the pawl 8, the pull rod is slidingly installed in the sliding hole provided on the side surface of the support leg frame 4, and a compression spring is wrapped outside the pull rod, and the two ends of the spring are respectively connected with the pawl 8 and the support leg frame 4; the pull rod can disengage the pawl 8 from the ratchet wheel 7, the spring can reset the pawl 8, and then the pawl 8 engages with the ratchet wheel 7 again; a groove is provided on the outer wall of the support leg 9, and a rack is provided in the groove, which engages with the control gear 6; the support leg 9 is slidingly installed in the large sliding hole provided on the support leg frame 4; a circular ring sliding groove 26 is provided on the lower part of the outer wall of the support leg 9, and three vertical sliding grooves 27 arranged in a circumferential array are provided below the circular ring sliding groove 26; the upper end of the vertical sliding groove 27 is connected with the circular ring sliding groove 26, and the lower end of the vertical sliding groove 27 does not exceed the bottom end of the support leg 9; the universal wheel 16 is installed at the lower end of the small support leg 15.

[0038] As Figures 9-13As shown, the turnover fixing mechanism comprises a slide rod 10, a stepped rod 11, a collar 12, a double connecting rod I 13, a rotating connecting block 14, and a small supporting leg 15. The lower end of the slide rod 10 is connected with the stepped rod 11 through a connecting plate. The slide rod 10 is wrapped with a compression spring outside. The two ends of the spring are connected with the slide rod 10 and the supporting leg frame 4 respectively. The slide rod 10 is slidingly installed in the small sliding hole provided on the supporting leg frame 4. A plurality of convex shafts are arranged in a circumferential array on the lower wall of the stepped rod 11. The connecting plate between the slide rod 10 and the stepped rod 11 is slidingly installed in the sliding groove provided on the side of the supporting leg 9. The stepped rod 11 is slidingly installed in the sliding groove inside the supporting leg 9. The diameter of the small-diameter end of the stepped rod 11 is the same as the inner diameter of the sleeve provided on the rotating connecting block 14. Three small convex plates are arranged in a circumferential array on the inner wall of the collar 12. The small convex plates are slidingly installed in the annular sliding groove 26. During the turnover fixing process of the turnover fixing mechanism, the small convex plates slide into the vertical sliding groove 27. The small convex plates provided on the inner wall of the collar 12 correspond to the vertical sliding grooves 27 one by one. The small convex plates form a ninety-degree angle with the corresponding vertical sliding grooves 27 in the initial position. A stretching spring is provided on the upper end of the collar 12. The spring is wrapped outside the supporting leg 9 and is fixedly connected with the baffle provided on the outer wall of the supporting leg 9. A large convex plate is provided on the side of the double connecting rod I 13 opposite to the collar 12. The large convex plate can drive the whole collar 12 to move by being pressed, thereby pushing the small supporting leg 15 to turn over through the double connecting rod I 13. One end of the double connecting rod I 13 is rotationally connected with the collar 12, and the other end of the double connecting rod I 13 is rotationally connected with the small supporting leg 15. A shaft is provided on the lower end of the rotating connecting block 14. The shaft is rotationally connected with the small supporting leg 15. A sleeve is provided on the rotating connecting block 14. A plurality of threads corresponding to the convex shafts provided on the outer wall of the stepped rod 11 are arranged on the inner wall of the sleeve. The sleeve provided on the rotating connecting block 14 is rotationally connected with the supporting leg 9. The elastic force of the spring wrapped outside the slide rod 10 is greater than the force required for the stepped rod 11 to rotate the rotating connecting block 14. During the upward movement of the supporting leg 9, the stepped rod 11 is kept stationary by the elastic force of the spring wrapped outside the slide rod 10, and then the stepped rod 11 enters the sleeve provided on the rotating connecting block 14. The convex shafts of the stepped rod 11 and the sliding grooves provided on the inner wall of the sleeve of the rotating connecting block 14 interact to rotate the rotating connecting block 14 by ninety degrees.

[0039] As Figures 3-5As shown, the lifting mechanism of the expanded carriage box body comprises: a support frame 17, a scissor lifting rod 18, a double connecting rod II 19, a connecting assembly 20, a manual power assembly 21, an electric power assembly 22, a lead screw I 23, a lead screw II 24, and a lead screw III 25. The scissor lifting rod 18 has two mirror-symmetrical arrangements, and each side of the scissor lifting rod 18 is provided with a corresponding double connecting rod II 19 and a connecting assembly 20. The support frame 17 surrounds the main box body 1 and is fixedly installed on the outer wall of the main box body 1, and the support frame 17 provides support for the remaining parts of the lifting mechanism. The lower end of the scissor lifting rod 18 is slidably connected with the support frame 17, and the two ends of the lower end of the scissor lifting rod 18 are connected with sliding blocks, and the two sliding blocks are threadedly connected with the two ends of the lead screw II 24. The upper end of the scissor lifting rod 18 is slidably installed in the sliding groove provided at the edge of the roof 3. The upper end of the four double connecting rods II 19 is rotatably installed at the four corner positions of the roof 3, and the lower end is rotatably connected with the support frame 17. The connecting assembly 20 is composed of two parts, which are slidably connected, forming an extensible mechanism, which is convenient for cooperating with the double connecting rod II 19. One double connecting rod II 19 cooperates with one connecting assembly 20. The upper part of the connecting assembly 20 is rotatably connected with the connecting position of the corresponding double connecting rod II 19. The lower part of the connecting assembly 20 on the left side of the scissor lifting rod 18 is threadedly connected with the lead screw I 23, and the lower part of the connecting assembly 20 on the right side of the scissor lifting rod 18 is threadedly connected with the lead screw III 25.

[0040] As shown in Figure 5 The manual power assembly 21 is composed of a plurality of bevel gears and shafts for transmitting power. By rotating one of the bevel gears manually, the power is transmitted to the two lead screws I 23 through the remaining bevel gears and shafts, thereby rotating the two lead screws I 23 manually. The electric power assembly 22 is composed of a motor, a plurality of bevel gears, and shafts for transmitting power. The rotation of the motor drives one of the bevel gears to rotate, and then the power is transmitted to the two lead screws III 25 through the remaining bevel gears and shafts, thereby rotating the two lead screws III 25 through the motor.

[0041] As shown in Figure 5 The two ends of the lead screw II 24 are fixedly installed with the lead screw I 23 and the lead screw III 25, respectively. The screw directions of the lead screw I 23 and the lead screw III 25 are opposite, thereby moving the connecting assembly 20 installed on the lead screw I 23 and the connecting assembly 20 installed on the lead screw III 25 in opposite directions, respectively. The screw directions of the two sides of the lead screw II 24 are opposite, thereby opening and closing the scissor lifting rod 18. The lead screw I 23, the lead screw II 24, and the lead screw III 25 are rotatably connected with the support frame 17.

[0042] Working principle: when the carriage box is moved to the top of the hopper by the universal wheel 16, the carriage box is aligned with the hopper, then the control disc 5 provided in the four supports lifting the whole carriage box is turned in turn, the pawl 8 is separated from the thorn wheel 7, at this time the control disc 5 can drive the control gear 6 to rotate to drive the supporting leg 9 to move up, and the carriage box is put down;

[0043] Then the control disc 5 drives the control gear 6 to rotate, then the rack installed on the supporting leg 9 drives the supporting leg 9 to move up, and then the carriage box is put on the hopper, the lower end of the main box 1 contacts with the hopper, in this process, the convex ball provided in the lower end of the ladder rod 11 slides into the sliding groove provided in the inner wall of the rotating connecting block 14, drives the rotating connecting block 14 to rotate 90 degrees, thereby drives the small supporting leg 15 and the universal wheel 16 to rotate 90 degrees, the small supporting leg 15 drives the double connecting rod I 13 in the rotating process, and then drives the sleeve ring 12 to rotate 90 degrees around the supporting leg 9, so that the large convex plate provided on the outer side of the sleeve ring 12 rotates to the lower side of the main box 1, at this time the small convex plate provided on the inner wall of the sleeve ring 12 coincides with the position of the corresponding vertical sliding groove 27, which is convenient for the small convex plate provided on the inner wall of the sleeve ring 12 to slide in the vertical sliding groove 27, and at the same time in this process, the convex plate provided on the outer side of the sleeve ring 12 gradually approaches the hopper; after the rotating connecting block 14 rotates 90 degrees, the ladder rod 11 moves to the bottom of the sleeve of the rotating connecting block 14, at this time the rotating connecting block 14 can drive the ladder rod 11 to move up, and then can drive the sliding rod 10 to move up;

[0044] Then the control disc 5 is rotated to drive the supporting leg 9 to move up, thereby driving the sleeve ring 12 to move up, the convex plate provided on the outer side of the sleeve ring 12 contacts with the hopper, then the sleeve ring 12 is pressed downward by the hopper, thereby driving the small supporting leg 15 to flip through the double connecting rod I 13, and then making the small supporting leg 15 flip 90 degrees around the shaft provided in the lower end of the rotating connecting block 14, at this time the small supporting leg 15 contacts with the hopper, thereby fixing the carriage box with the hopper, in this process, the sliding rod 10 and the ladder rod 11 move up with the supporting leg 9 and the rotating connecting block 14, thereby compressing the spring wrapped outside the sliding rod 10;

[0045] At the same time, when it is needed to take the carriage box off the hopper, the pawl 8 engages with the thorn wheel 7 under the action of the spring, then the control disc 5 is reversely rotated to drive the control gear 6 to reversely rotate to drive the supporting leg 9 to move down, then the spring provided on the sleeve ring 12 reversely flips the flipping fixing mechanism, then the supporting leg 9 continues to move down to make the universal wheel 16 contact with the ground, then the ladder rod 11 drives the rotating connecting block 14 to reversely rotate, and through the supporting leg 9, the small supporting leg 15 and the universal wheel 16, the carriage box is lifted up, so that the carriage box is separated from the hopper, which is convenient for taking the carriage box off the hopper;

[0046] When it is needed to open the expansion module 2, the manual power assembly 21 can be manually rotated to drive the screw rod I 23, the screw rod II 24 and the screw rod III 25 to rotate, thereby driving the connecting assembly 20 to move and simultaneously driving the scissor lifting rod 18 to open, and then the roof 3 is moved upward to open the expansion module 2, in this process, the double connecting rod II 19 is driven by the connecting assembly 20 to open downward, when stopping, the double connecting rod II 19 is supported on the four corners of the roof 3, the scissor lifting rod 18 is supported on the middle position of the two long edges of the roof 3, the scissor lifting rod 18 and the double connecting rod II 19 support the roof 3, the multiple double connecting rods II 19 and the multiple scissor lifting rods 18 can firmly support the roof 3, avoiding the roof 3 from shaking due to the action of wind force, affecting the living feeling of the people in the box car;

[0047] Similarly, when it is needed to be powered, the motor in the electric power assembly 22 is powered, and then the motor drives the electric power assembly 22 to drive the screw rod I 23, the screw rod II 24 and the screw rod III 25 to rotate, thereby driving the connecting assembly 20 to move and simultaneously driving the scissor lifting rod 18 to open, and then the roof 3 is moved upward to open the expansion module 2;

[0048] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lifting device of a carriage box, comprising a carriage box, a support for lifting the carriage box, and a lifting mechanism for expanding the carriage box, characterized in that, The box body of the vehicle cabin comprises a main box body (1), an expansion module (2) and a roof (3); the expansion module (2) connects the main box body (1) and the roof (3), and is made of soft material; The support for lifting the box body of the vehicle cabin comprises a support leg bracket (4) fixedly installed in the middle groove of four corners of the main box body (1), a control disc (5) rotationally installed with the support leg bracket (4), a control gear (6) and a ratchet wheel (7) sequentially arranged and installed on the shaft provided on the control disc (5), a pawl (8) engaged with the ratchet wheel (7), a support leg (9) slidingly installed with the support leg bracket (4), and a turnover fixing mechanism installed on the support leg (9); The turnover fixing mechanism comprises a sliding rod (10) slidingly installed with the small sliding hole on the support leg bracket (4), a stepped rod (11) connected with the lower end of the sliding rod (10) and capable of controlling the rotation of a rotation connecting block (14), the rotation connecting block (14) rotationally installed with the support leg (9), a small support leg (15) rotationally installed with the rotation connecting block (14), and a double connecting rod I (13) connected with the sleeve ring (12) and the small support leg (15) and capable of pushing the small support leg (15) to turn over. The lifting mechanism of the expansion vehicle cabin box body comprises a support frame (17) fixedly installed on the outer wall of the main box body (1) and surrounding the main box body (1) for one round, a scissor type lifting rod (18) slidingly connected with the support frame (17), a double connecting rod II (19) rotationally connected with the support frame (17), a connecting assembly (20) rotationally connected with the double connecting rod II (19) and capable of cooperating with each other, and a manual power assembly (21), an electric power assembly (22), a lead screw I (23), a lead screw II (24) and a lead screw III (25) for opening the expansion module (2).

2. A lift device for a bed box as defined in claim 1, characterized in that The lower part of the outer wall of the support leg (9) is provided with a circular ring sliding groove (26), and three vertical sliding grooves (27) arranged in a circular array are arranged below the circular ring sliding groove (26); the upper end of the vertical sliding groove (27) is connected with the circular ring sliding groove (26), and the lower end of the vertical sliding groove (27) does not exceed the bottom end of the support leg (9).

3. A lifting device for a bed box according to claim 2, characterized in that The inner wall of the sleeve ring (12) is provided with three small protruding plates arranged in a circular array, which correspond to the vertical sliding grooves (27) one by one and present a ninety-degree angle with the corresponding vertical sliding grooves (27) in the initial position, and the small protruding plates are slidingly installed in the circular ring sliding groove (26) and slide into the vertical sliding grooves (27) during the turnover fixing process of the turnover fixing mechanism; the outer side of the sleeve ring (12) is provided with a large protruding plate at the opposite end of the double connecting rod I (13), and pressing the large protruding plate can drive the sleeve ring (12) to move as a whole.

4. A lift device for a bed box as defined in claim 1, characterized in that The universal wheel (16) is installed below the small support leg (15), and the support of the whole lifting vehicle cabin body has four, which are fixedly installed at the middle positions of the four corners of the main box body (1) to support the vehicle cabin body.

5. A lift device for a bed box as defined in claim 1, wherein The spring wrapped outside the sliding rod (10) has a greater elastic force than the force required for the stepped rod (11) to push the rotation connecting block (14) to rotate.

6. A lift device for a bed box as defined in claim 1, wherein The two mirror-symmetrical scissors-type lifting rods (18) are arranged on both sides of the vehicle roof (3), and each of the two scissors-type lifting rods (18) is provided with a corresponding double connecting rod II (19) and a connecting assembly (20) on both sides; the two ends of the scissors-type lifting rod (18) are connected with the sliding blocks, and the sliding blocks are threadedly connected with the two ends of the screw rod II (24); the upper end of the scissors-type lifting rod (18) is slidingly installed in the sliding groove arranged on the edge of the vehicle roof (3); the upper end of the four double connecting rods II (19) is rotatably installed at the four corner positions of the vehicle roof (3) and is used for firmly supporting the vehicle roof (3); the lower part of the connecting assembly (20) located on the left side of the scissors-type lifting rod (18) is threadedly connected with the screw rod I (23), and the lower part of the connecting assembly (20) located on the right side of the scissors-type lifting rod (18) is threadedly connected with the screw rod III (25).

7. A lifting device for a bed box according to claim 6, characterized in that The screw rod I (23), the screw rod II (24) and the screw rod III (25) are rotatably connected with the support frame (17); The two ends of the screw rod II (24) are fixedly installed with the screw rod I (23) and the screw rod III (25); the screw rod I (23) and the screw rod III (25) are opposite in the screw direction and drive the connecting assembly (20) installed on the screw rod I (23) and the connecting assembly (20) installed on the screw rod III (25) to move in opposite directions; the screw rods II (24) are opposite in the screw direction and drive the scissors-type lifting rod (18) to open and fold.

8. A carriage box lifting device according to claim 7, characterised in that, The manual power assembly (21) is composed of a plurality of bevel gears and shafts for transmitting power, and power is transmitted to the two screw rods I (23) through the transmission mechanism composed of the remaining bevel gears and shafts by rotating one of the bevel gears manually, so as to drive the two screw rods I (23) to rotate manually; the electric power assembly (22) is composed of a motor, a plurality of bevel gears and shafts for transmitting power, and power is transmitted to the two screw rods III (25) through the remaining bevel gears and shafts by rotating one of the bevel gears driven by the motor, so as to drive the two screw rods III (25) to rotate by the motor.

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