Balance supporting leg supporting device of detachable carriage

Abstract

The invention relates to the technical field of transportation equipment, and discloses a balance leg supporting device for a detachable carriage, which comprises a first lifting structure positioned at the front end of the carriage, a second lifting structure positioned at the rear end of the carriage, and a lifting mechanism arranged on a chassis and used for supporting the carriage; the first lifting structure comprises two lifting mechanisms arranged on the left side and the right side of the front portion of the cargo compartment correspondingly. The first supporting leg balance mechanism comprises a first balance weight or a spring, and the first transverse support and the second transverse support are arranged in parallel. The weight of a first balance weight of the first supporting leg balance mechanism or the tension or pressure of a spring is matched with the weight of the first supporting leg. The first lifting structure and the second lifting structure are arranged at the front end and the rear end of the cargo compartment correspondingly, the first lifting structure and the second lifting structure control lifting and ground supporting of the supporting legs by installing the supporting leg reset structures and the fixing mechanisms, and the cost is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of transportation equipment technology, and specifically to a balanced outrigger support device for a detachable carriage. Background Technology

[0002] Currently, detachable cargo boxes or containers generally suffer from the following problems: reliance on external power systems, such as hydraulic cylinders and electric motors, which require matching oil circuits, electrical circuits, or batteries, resulting in complex structures and high costs; limited loading and unloading efficiency: large cargo boxes often require the use of lifting equipment, with strict requirements for site and equipment; poor flexibility and adaptability: especially difficult to apply in remote or temporary work sites lacking electricity or hydraulic power.

[0003] Our company previously applied for patents and documents, with application number CN202322470232.0 and titled "A Ground Loading and Unloading Structure for Freight Vehicles" and document number CN202322847456.9 and titled "A Ground Support Leg for a Box Freight Vehicle," which solved the above problems, but the cost was still relatively high. Therefore, in order to further reduce costs, a new lifting device is needed. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a balanced outrigger support device for a detachable cargo box. By setting a first lifting structure and a second lifting structure at the front and rear of the cargo box respectively, and by installing an outrigger reset structure and a fixing mechanism to control the lifting and grounding of the outriggers, the cost is greatly reduced.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a balance support leg device for a detachable cargo box, comprising a first lifting structure located at the front end of the cargo box and a second lifting structure located at the rear end of the cargo box, as well as a lifting mechanism mounted on the chassis for supporting the cargo box. The first lifting structure includes two lifting mechanisms respectively disposed on the left and right sides of the front of the cargo box; the lifting mechanism includes a limiting frame fixedly installed on the cargo box, a first cross brace rotatably disposed on the upper part of the limiting frame, a second cross brace rotatably disposed on the lower part of the limiting frame, a first support leg rotatably connected to one end of the first and second cross braces, a first support leg balancing mechanism that enables the first cross brace to rotate, and a fixing mechanism that enables the second cross brace or the first support leg to stop rotating; the first support leg balancing mechanism includes a first counterweight or spring, and the first cross brace and the second cross brace are arranged parallel to each other; The weight of the first counterweight of the first leg balancing mechanism or the tension or compression of the spring is matched with the weight of the first leg. In the first lifting structure, the lateral distance between the two first outriggers after they are lowered and supported on the ground is greater than the width of the chassis; The cargo box is fixedly connected by a first fixed shaft and a second fixed shaft; In the first lifting structure, the two first legs are parallel to the axes of the first fixed shaft and the second fixed shaft, and the length of the first leg is greater than the distance between the first fixed shaft and the second fixed shaft. The cargo box and the lifting mechanism on the chassis are equipped with abutment blocks that can abut against them at corresponding positions; the second cross brace is higher than the chassis; When the first leg is on the ground, the second cross brace is higher than the height of the chassis.

[0006] Furthermore, the first fixed shaft and the second fixed shaft are spaced apart vertically and are both fixedly connected to the limiting frame. The middle part of the first cross brace is rotatably connected to the first fixed shaft, one end of the first cross brace is rotatably connected to the first support leg, one end of the second cross brace is rotatably connected to the second fixed shaft, and the other end of the second cross brace is rotatably connected to the first support leg. The first counterweight and the first support leg are located on the left and right sides of the first fixed shaft, respectively. The axes of the first fixed shaft and the second fixed shaft are parallel to the first support leg. The vertical distance between the first fixed shaft and the second fixed shaft is less than the height of the first support leg.

[0007] Furthermore, the fixing mechanism includes a plurality of first limiting holes opened on the limiting frame, and / or a second insertion hole opened on the second cross brace, and a pin that can arbitrarily pass through the first limiting holes or / and cooperate with the second cross brace.

[0008] Furthermore, the first counterweight is connected to the first cross brace; the weight of the first counterweight is matched with the weight of the first leg.

[0009] Furthermore, the second lifting structure is the same as the first lifting structure.

[0010] Furthermore, the second lifting structure includes two second lifting mechanisms respectively disposed on the left and right sides of the rear of the cargo box; the second lifting mechanism includes a fixed cylinder vertically disposed on the cargo box, a pulley rotatably disposed on the fixed cylinder, a rope wound around the pulley in the middle, a second counterweight fixedly connected to one end of the rope, a second leg fixedly connected to the other end of the rope, and a second fixing mechanism capable of confining the second leg on the fixed cylinder; the second counterweight is adapted to the weight of the second leg, and the second leg is slidably connected to the fixed cylinder.

[0011] Furthermore, the second fixing mechanism includes at least one second insertion hole opened on the second leg, and / or at least one second limiting hole opened vertically on the fixing cylinder, and a second pin that can arbitrarily pass through the second insertion hole or / and cooperate with the second limiting hole.

[0012] Furthermore, one end of the spring is connected to the cargo box or the limiting frame, and the other end is connected to the first cross brace, the second cross brace, or the first leg. The tension or pressure of the spring is matched with the weight of the first leg.

[0013] Furthermore, the first leg balancing mechanism also includes a telescopic cylinder with one end connected to the cargo box or limit frame and the other end connected to the first cross brace, the second cross brace, or the first leg.

[0014] Furthermore, the second lifting mechanism also includes a second spring with one end connected to the fixed cylinder and the other end connected to the second leg; the tension or pressure of the second spring is adapted to the weight of the second leg.

[0015] Furthermore, the second lifting mechanism also includes a second telescopic cylinder with one end connected to the fixed cylinder and the other end connected to the second outrigger.

[0016] Furthermore, the first leg and the second leg may be equipped with rollers, and the rollers may be equipped with brakes.

[0017] Furthermore, it also includes a ground support rod installed on the chassis to prevent it from tipping over during loading and unloading, and the ground support rod may be equipped with a push device for retracting and lowering it.

[0018] Furthermore, it also includes a front and rear limiting structure at the front end of the chassis that contacts the cargo box, a left and right correction structure when the cargo box is combined with the chassis, and a fixing structure between the cargo box and the chassis.

[0019] The beneficial effects of this invention are as follows: By setting a first lifting structure and a second lifting structure at the front and rear of the cargo box respectively, and by controlling the lifting and grounding of the outriggers through the installation of a leg reset structure and a fixing mechanism, the cost is greatly reduced. The dual lifting structure arrangement—front and rear—enhances stability; the fixing mechanism, with the cooperation of pins and limit holes, quickly fixes the height of the outriggers, providing support for the cargo box; when using counterweights, the lifting is purely mechanical, requiring no additional power source; it is low-cost, easy to maintain, and highly adaptable; it significantly improves loading and unloading efficiency and site flexibility, making it particularly suitable for logistics, construction sites, emergency transportation, and other fields; when using telescopic cylinders or springs, or both in conjunction with counterweights, the telescopic cylinders and springs only supplement the force for lifting or grounding the outriggers, requiring only a small force, much less than the existing methods that require hydraulic cylinders or other hydraulic cylinders to support the entire cargo box. Therefore, using telescopic cylinders and related facilities also significantly reduces costs. The addition of a lifting mechanism and grounding auxiliary rod further enhances safety and ease of operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the side view structure; Figure 2 This is a schematic diagram of the structure in the front view. Figure 3 This is a schematic diagram of the first lifting structure; Figure 4 This is a schematic diagram of the auxiliary support structure; Figure 5 This is a schematic diagram of the second lifting structure; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 This is a three-dimensional schematic diagram of the second lifting structure; Figure 8 A schematic diagram of the structure using a telescopic cylinder for the first lifting mechanism; Figure 9 A schematic diagram of the structure using a spring and / or telescopic cylinder for the first lifting mechanism; Figure 10 A schematic diagram of the structure using the second telescopic cylinder for the second lifting mechanism; Figure 11 This is a schematic diagram of the second spring connection.

[0021] In the diagram: 1. Cargo box; 2. Chassis; 3. Fixed cylinder; 301. Second support leg; 302. Pulley; 303. Rope; 304. Second counterweight; 305. Baffle plate; 306. Second limiting hole; 307. Second insertion hole; 4. Limiting frame; 401. First fixed shaft; 402. Second fixed shaft; 403. First cross brace; 404. First counterweight; 405. First connecting piece; 406. First support leg; 407. Second connecting piece; 408. Second cross brace; 409. First limiting hole; 5. Lifting mechanism; 6. Abutment block; 7. Ground support auxiliary rod; 8. Telescopic cylinder; 9. Spring; 10. Second telescopic cylinder; 11. Second spring. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The directional terms mentioned in this invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this invention and are not absolute limitations on the actual use.

[0024] Example: like Figures 1-11As shown, a detachable cargo box balance support device is installed on the cargo box 1, which is located on the chassis 2. Both the cargo box 1 and the chassis 2 are existing technologies. Hollow square steel bars 3 with open bottoms are provided at the four corners of the cargo box 1. The device includes a first lifting structure located at the front end of the cargo box 1 and a second lifting structure located at the rear end of the cargo box 1, as well as a lifting mechanism 5 installed on the chassis 2 for supporting the cargo box 1. like Figure 1 As shown, the end of the cargo box 1 closest to the front of the vehicle is defined as the front end, i.e. Figure 1 The right end face of the cargo box is the front end, and the left end face is the rear end. The direction perpendicular to the front-back direction is the left-right direction, which is also the longitudinal direction, and the left-right direction is also the transverse direction. The inner and outer sides are defined as follows: in the transverse direction, the side closer to the edge of the cargo box is the outer side, and the side closer to the middle of the cargo box is the inner side, such as the position of the first fixed shaft 401 and the second fixed shaft 402; the transverse spacing is the width, the longitudinal spacing is the length, and the vertical distance is the height; the length of the outrigger is its vertical height.

[0025] The first lifting structure includes two lifting mechanisms respectively disposed on the left and right sides of the front of the cargo box 1 to support the left and right sides of the cargo box 1; the lifting mechanism includes a limiting frame 4 fixedly installed on the cargo box 1, a first cross brace 403 rotatably disposed on the upper part of the limiting frame 4, a second cross brace 408 rotatably disposed on the lower part of the limiting frame 4, a first support leg 406 rotatably connected to one end of the first cross brace 403 and the second cross brace 408, a first support leg balancing mechanism that enables the first cross brace 403 to rotate, and a fixing mechanism that enables the second cross brace 408 or the first support leg 406 to stop rotating; the first support leg balancing mechanism includes a first counterweight 404 or a spring 9, and the first cross brace 403 and the second cross brace 408 are arranged parallel to each other; The weight of the first counterweight 404 of the first leg balancing mechanism or the tension or compression of the spring 9 is matched with the weight of the first leg 406; here and thereafter, matching means equal or substantially equal weight.

[0026] The lateral distance between the two first outriggers 406 in the first lifting structure after they are lowered to support the ground is greater than the width of the chassis 2; The cargo box 1 is fixedly connected to a first fixed shaft 401 and a second fixed shaft 402; In the first lifting structure, the two first legs 406 are parallel to the axes of the first fixed shaft 401 and the second fixed shaft 402, and the length of the first leg 406 is greater than the distance between the first fixed shaft 401 and the fixed shaft 402. The cargo box 1 is equipped with abutment blocks 6 at corresponding positions on the lifting mechanism 5 on the chassis 2; the second cross brace 408 is higher than the chassis 2. When the first leg 406 is on the ground, the second cross brace 408 is higher than the height of the chassis 2.

[0027] A lifting mechanism includes a set of limit frames 4, each set of limit frames 4 consisting of two limit frames 4, one in front and one in back, which are fixedly connected by a connecting plate at the bottom.

[0028] The first leg 406 is rotatably connected to the first cross brace 403 via the first connector 405, and the first leg 406 is connected to the second cross brace 408 via the second connector 407. Specifically, the first leg 406 is fixedly connected to one end of the first connector 405 and the second connector 407, and the other end of the first connector 405 and the second connector 407 are rotatably connected to the first cross brace 403 and the second cross brace 408 via pins, respectively. The first connector 405 and the second connector 407 are triangular, elongated, or other shapes that can achieve the connection function.

[0029] By installing a first lifting structure at the front end and a second lifting structure at the rear end of the cargo box, and by controlling the raising and lowering of the outriggers through the installation of outrigger reset structures and fixing mechanisms in both structures, costs are significantly reduced. The dual lifting structure arrangement—front and rear—enhances stability.

[0030] A fixing mechanism, with the engagement of pins and limit holes, quickly and securely fixes the outrigger height, providing support for the cargo box. When using counterweights, the lifting is purely mechanical, requiring no additional power source. It is low-cost, easy to maintain, and highly adaptable, significantly improving loading and unloading efficiency and site flexibility, making it particularly suitable for logistics, construction sites, and emergency transportation. When using telescopic cylinders or springs, or both in conjunction with counterweights, the cylinders and springs only supplement the force required to lift the outriggers or support the ground, requiring minimal force. This is far less than existing methods that require hydraulic cylinders to support the entire cargo box, thus significantly reducing costs. The addition of a lifting mechanism and ground support auxiliary rods further enhances safety and ease of operation.

[0031] The second cross brace 408 is higher than the chassis 2.

[0032] It also includes a ground support rod 7 installed on the chassis 2 to prevent it from tipping over during loading and unloading. The ground support rod 7 may be equipped with a pushing device to raise and lower it. The pushing device is a cylinder or hydraulic cylinder, with one end connected to the ground support rod 7 and the other end connected to the chassis 2.

[0033] The first fixed shaft 401 and the second fixed shaft 402 are spaced apart vertically and are both fixedly connected to the limiting frame 4. The middle part of the first cross brace 403 is rotatably connected to the first fixed shaft 401. One end of the first cross brace 403 is rotatably connected to the first support leg 406. One end of the second cross brace 408 is rotatably connected to the second fixed shaft 402. The other end of the second cross brace 408 is rotatably connected to the first support leg 406. The first counterweight 404 and the first support leg 406 are located on the left and right sides of the first fixed shaft 401, respectively. The axes of the first fixed shaft 401 and the second fixed shaft 402 are parallel to the first support leg 406. The vertical distance between the first fixed shaft 401 and the second fixed shaft 402 is less than the height of the first support leg 406.

[0034] The fixing mechanism includes a plurality of first limiting holes 409 formed on the limiting frame 4, and / or second insertion holes formed on the second cross brace 408, and a pin that can arbitrarily pass through the first limiting holes 409 or / and cooperate with the second cross brace 408.

[0035] The first counterweight 404 is connected to the first cross brace 403; the weight of the first counterweight 404 is matched with the weight of the first leg 406.

[0036] There are two types of second lifting structures. The first type is the same as the first lifting structure.

[0037] The second type: The second lifting structure includes two second lifting mechanisms respectively arranged on the left and right sides of the rear of the cargo box 1; the second lifting mechanism includes a fixed cylinder 3 vertically arranged on the cargo box 1, a pulley 302 rotatably arranged on the fixed cylinder 3, a rope 303 wound around the pulley 302 in the middle, a second counterweight 304 fixedly connected to one end of the rope 303, a second support leg 301 fixedly connected to the other end of the rope 303, and a second fixing mechanism that can limit the second support leg 301 to the fixed cylinder 3; the weight of the second counterweight 304 is adapted to the weight of the second support leg 301, and the second support leg 301 is slidably connected to the fixed cylinder 3.

[0038] A fixing plate is provided on the fixing cylinder 3, and two baffles are installed on the fixing plate at a distance from each other. The two baffles are connected by a pin, and the pulley is rotatably sleeved on the pin. The fixing cylinder can be directly connected to the two baffles without a fixing plate. A baffle 305 is provided at the connection between the rope 303 and the second counterweight 304 to prevent the counterweight 304 from flipping over the pulley 302 with the rope 303 or to prevent the two from directly colliding and potentially being damaged.

[0039] The second fixing mechanism includes at least one second insertion hole 307 opened on the second leg 301, and / or at least one second limiting hole 306 opened vertically on the fixing cylinder 3, and a second pin that can arbitrarily pass through the second insertion hole 307 or / and cooperate with the second limiting hole 306; the second leg 301 is fixed by inserting the second pin, and the second pin is removed when it is necessary to raise or lower.

[0040] One end of the spring 9 is connected to the cargo box 1 or the limiting frame 4, and the other end is connected to the first cross brace 403, the second cross brace 408 or the first support leg 406. The tension or pressure of the spring 9 is matched with the weight of the first support leg 406.

[0041] The first leg balancing mechanism also includes a telescopic cylinder 8, one end of which is connected to the cargo box 1 or the limiting frame 4, and the other end of which is connected to the first cross brace 403, the second cross brace 408 or the first leg 406.

[0042] The second lifting mechanism also includes a second spring 11, one end of which is connected to the fixed cylinder 3 and the other end of which is connected to the second support leg 301; the tension or pressure of the second spring 11 is adapted to the weight of the second support leg 301.

[0043] The second lifting mechanism also includes a second telescopic cylinder 10, one end of which is connected to the fixed cylinder 3 and the other end of which is connected to the second support leg 301.

[0044] The first leg 406 and the second leg 301 are equipped with rollers, and the rollers may be equipped with brakes.

[0045] The ground support rod 7 is rotatably connected to the chassis 2 and can only rotate forward and backward.

[0046] It also includes a front and rear limiting structure at the front end of the chassis 2 that contacts the cargo box 1, a left and right correction structure when the cargo box 1 is combined with the chassis 2, and a fixing structure between the cargo box 1 and the chassis 2. The front and rear positioning structure and the left and right correction structure both use the technical solution in Chinese Utility Model Patent No. 202120970522.X, entitled "A Loading and Unloading Positioning Vehicle-Mounted Device", and the locking shaft fixing structure uses the technical solution in Chinese Utility Model Patent No. 202420706686.5, entitled "A Positioning Correction and Buffer Device for Demountable Vehicles".

[0047] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A balance support leg device for a detachable carriage, characterized in that: It includes a first lifting structure located at the front end of the cargo box (1) and a second lifting structure located at the rear end of the cargo box (1), as well as a lifting mechanism (5) installed on the chassis (2) for supporting the cargo box (1). The first lifting structure includes two lifting mechanisms respectively disposed on the left and right sides of the front of the cargo box (1); the lifting mechanism includes a limiting frame (4) fixedly installed on the cargo box (1), a first cross brace (403) rotatably disposed on the upper part of the limiting frame (4), a second cross brace (408) rotatably disposed on the lower part of the limiting frame (4), a first support leg (406) rotatably connected to one end of the first cross brace (403) and the second cross brace (408), a first support leg balancing mechanism that enables the first cross brace (403) to rotate, and a fixing mechanism that enables the second cross brace (408) or the first support leg (406) to stop rotating; the first support leg balancing mechanism includes a first counterweight (404) or a spring (9), and the first cross brace (403) and the second cross brace (408) are arranged in parallel; The weight of the first counterweight (404) of the first leg balancing mechanism or the tension or pressure of the spring (9) is adapted to the weight of the first leg (406); The lateral distance between the two first legs (406) in the first lifting structure after they are lowered and supported on the ground is greater than the width of the chassis (2); The cargo box (1) is fixedly connected to a first fixed shaft (401) and a second fixed shaft (402). The two first legs (406) in the first lifting structure are parallel to the axes of the first fixed shaft (401) and the second fixed shaft (402), and the length of the first leg (406) is greater than the distance between the first fixed shaft (401) and the fixed shaft (402); The cargo box (1) is provided with abutting blocks (6) that can abut against the lifting mechanism (5) on the chassis (2) at the upper and lower corresponding positions; the second cross brace (408) is higher than the chassis (2). When the first outrigger (406) is on the ground, the second cross brace (408) is higher than the height of the chassis (2).

2. The balance support leg device for a detachable car body according to claim 1, characterized in that: The first fixed shaft (401) and the second fixed shaft (402) are spaced apart vertically and are both fixedly connected to the limiting frame (4). The middle part of the first cross brace (403) is rotatably connected to the first fixed shaft (401). One end of the first cross brace (403) is rotatably connected to the first leg (406). One end of the second cross brace (408) is rotatably connected to the second fixed shaft (402). The other end of the second cross brace (408) is rotatably connected to the first leg (406). The first counterweight (404) and the first leg (406) are located on the left and right sides of the first fixed shaft (401), respectively. The axes of the first fixed shaft (401) and the second fixed shaft (402) are parallel to the first leg (406). The vertical distance between the first fixed shaft (401) and the second fixed shaft (402) is less than the height of the first leg (406).

3. The balance support leg device for a detachable car body according to claim 1, characterized in that: The fixing mechanism includes a plurality of first limiting holes (409) opened on the limiting frame (4), and / or a second insertion hole opened on the second cross brace (408), and a pin that can be arbitrarily inserted through the first limiting holes (409) or / and cooperate with the second cross brace (408).

4. The balance support leg device for a detachable car body according to claim 1, characterized in that: The first counterweight (404) is connected to the first cross brace (403); the weight of the first counterweight (404) is adapted to the weight of the first support leg (406).

5. The balance support leg device for a detachable car body according to claim 1, characterized in that: The second lifting structure includes two second lifting mechanisms respectively disposed on the left and right sides of the rear of the cargo box (1); the second lifting mechanism includes a fixed cylinder (3) vertically disposed on the cargo box (1), a pulley (302) rotatably disposed on the fixed cylinder (3), a rope (303) wound around the pulley (302) in the middle, a second counterweight (304) fixedly connected to one end of the rope (303), a second leg (301) fixedly connected to the other end of the rope (303), and a second fixing mechanism that can limit the second leg (301) to the fixed cylinder (3); the weight of the second counterweight (304) is adapted to the weight of the second leg (301), and the second leg (301) is slidably connected to the fixed cylinder (3).

6. The balance support leg device for a detachable car body according to claim 5, characterized in that: The second fixing mechanism includes at least one second insertion hole (307) opened on the second leg (301), and / or at least one second limiting hole (306) opened vertically on the fixing cylinder (3), and a second pin that can arbitrarily pass through the second insertion hole (307) or / and cooperate with the second limiting hole (306).

7. The balance support leg device for a detachable car body according to claim 1, characterized in that: One end of the spring (9) is connected to the cargo box (1) or the limiting frame (4), and the other end is connected to the first cross brace (403), the second cross brace (408) or the first support leg (406). The tension or pressure of the spring (9) is matched with the weight of the first support leg (406).

8. The balance support leg device for a detachable car body according to claim 1, characterized in that, The first outrigger balancing mechanism also includes a telescopic cylinder (8) with one end connected to the cargo box (1) or the limit frame (4) and the other end connected to the first cross brace (403), the second cross brace (408) or the first outrigger (406).

9. A balance support leg device for a detachable car body according to claim 5, characterized in that: The second lifting mechanism also includes a second spring (11) with one end connected to the fixed cylinder (3) and the other end connected to the second leg (301); the tension or pressure of the second spring (11) is adapted to the weight of the second leg (301).

10. A balanced outrigger support device for a detachable car body according to claim 1, characterized in that, The second lifting mechanism also includes a second telescopic cylinder (10) with one end connected to the fixed cylinder (3) and the other end connected to the second support leg (301).

11. The balance support leg device for a detachable car body according to claim 1, characterized in that: The first leg (406) and the second leg (301) may be equipped with rollers, and the rollers may be equipped with brakes.

12. The balance support leg device for a detachable car body according to claim 1, characterized in that: It also includes a ground support rod (7) installed on the chassis (2) to prevent it from tipping over during loading and unloading, and the ground support rod (7) is provided with a push device for it to be retracted and lowered.

13. The balance support leg device for a detachable car body according to claim 1, characterized in that: It also includes a front and rear limiting structure that is set at the front end of the chassis (2) and contacts the cargo box (1), a left and right correction structure when the cargo box (1) and the chassis (2) are combined, and a fixing structure between the cargo box (1) and the chassis (2).

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