Detachable chassis structure of carriage

Abstract

The utility model relates to a detachable chassis structure of a carriage. Comprising a chassis, a vehicle head arranged at the front end of the chassis and a compartment arranged at the top of the chassis, and a lower chassis unit is arranged at the top of the chassis; an upper underframe unit capable of moving on the lower underframe unit and being locked is arranged at the bottom of the carriage; the lower chassis unit comprises a sliding locking part and a power part, and the upper part of the power part is detachably connected with the carriage; the locking device has the advantages that an existing vehicle chassis structure is not changed, labor intensity is reduced, separation and assembly of the vehicle and the compartment are facilitated, and the locking mode is firm so that driving safety can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an automobile accessory part technical field, concretely is a detachable chassis structure of carriage. BACKGROUND

[0002] In the prior art, Chinese patent publication No. CN216915647U discloses a detachable automobile multi-operation platform of carriage, which discloses the following structure: a slide rail is arranged on the top of the bottom plate, a sliding block is connected inside the slide rail, the top of the sliding block is fixedly connected with a carriage, a cavity is formed in the inside of the bottom plate, an adjusting rod is fixedly connected to the bottom of the sliding block and penetrates into the inside of the cavity, a locking ring is threadedly connected to the middle part of the adjusting rod, positioning plates are fixedly connected to the both sides of the bottom plate, a chain is fixedly connected to one side of the positioning plate, a tension spring is fixedly connected to the middle part of the chain, a hook is fixedly connected to one end of the chain, and the hook is hung on the bottom end of the adjusting rod. The above structure can realize the separation of the bottom plate and the carriage, but there are the following defects in actual use: 1. There is no power facility during the separation and assembly process of the bottom plate and the carriage, especially when the carriage is in a full load state, the weight of the carriage is large, and it is difficult to separate and assemble the bottom plate and the carriage; 2. The locking part between the bottom plate and the carriage is located at the bottom of the vehicle, especially when the bottom plate is installed on the vehicle chassis, not only the installation position is limited, but also the operator needs to drill into the bottom of the vehicle to operate, which has the defect of difficult operation. UTILITY MODEL CONTENTS

[0003] The utility model aims at providing a detachable chassis structure of carriage to solve the problems raised in the background art.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] A detachable chassis structure of carriage, comprising a chassis, a vehicle head arranged at the front end of the chassis, and a carriage arranged at the top of the chassis, wherein the top of the chassis is provided with a lower chassis unit;

[0006] The bottom of the carriage is provided with an upper chassis unit that can move on the lower chassis unit and be locked.

[0007] The lower chassis unit comprises a sliding locking part and a power part, and the upper part of the power part is detachably connected with the carriage.

[0008] By adopting the technical scheme, the detachable chassis structure is divided into a lower chassis unit and an upper chassis unit, the lower chassis unit is connected with the vehicle chassis, the upper chassis unit is connected with the carriage, a sliding locking part and a power part are arranged between the lower chassis unit and the upper chassis unit, and the power part cooperates with the sliding locking part to slide and lock the carriage, so as to reduce the labor intensity of workers, avoid that the operator drills into the bottom of the vehicle to operate, and facilitate the separation and assembly of the vehicle and the carriage.

[0009] Preferably, the bottom of the sliding locking part is fixedly connected with the chassis, and the top of the sliding locking part is matched with the upper chassis unit at the bottom of the carriage, so as to realize the movement and locking of the upper chassis unit.

[0010] The power part is fixedly connected with the sliding locking part, and is detachably connected with the front end of the carriage, so as to cooperate with the sliding locking part to fix the carriage.

[0011] Preferably, the sliding locking part comprises two main beams which are arranged in parallel and connected with the chassis, a slide is arranged at the middle position of the main beam, guide blocks which are higher than the main beam and are used for guiding are arranged at the two sides of the main beam, and a locking piece which is used for locking the upper chassis unit is arranged on the main beam.

[0012] Preferably, the power part comprises a secondary hydraulic oil cylinder and a main hydraulic oil cylinder, a first connecting support for fixing the secondary hydraulic oil cylinder is arranged at the front part between the two main beams, a second connecting support for fixing the main hydraulic oil cylinder is arranged at the rear part between the two main beams, and an oil cylinder support for supporting and fixing the movable end of the main hydraulic oil cylinder is arranged at the middle part between the two main beams; the movable end of the secondary hydraulic oil cylinder is connected with the middle part of the fixed end of the main hydraulic oil cylinder, and the movable end of the main hydraulic oil cylinder is movably connected with the front end of the carriage through a hook.

[0013] Preferably, the upper chassis unit comprises a secondary beam which is matched with the lower chassis unit, the top of the secondary beam is fixedly connected with the bottom of the carriage, and a locked piece is arranged on the secondary beam.

[0014] Preferably, the locking piece is a steel pipe arranged at the front part of the main beam, and the locked piece is a conical rod arranged at the front part of the secondary beam and matched with the inner diameter of the steel pipe.

[0015] Preferably, the locking piece is an inverted L-shaped blocking rod arranged at the rear part of the main beam, and the locked piece is a square tube pin arranged between the secondary beams.

[0016] Preferably, a reinforcing connecting rod is arranged between the rear parts of the main beams, and a ground support is arranged at the middle part of the reinforcing connecting rod.

[0017] The ground support comprises a connecting plate connected with the reinforcing connecting rod, a ground support rod is hingedly connected to the lower part of the connecting plate, a ground support oil cylinder is fixedly installed on the upper part of the connecting plate, the movable end of the ground support oil cylinder is connected with the ground support rod, and a square tube pin locking rod is arranged at the top of the ground support rod.

[0018] Preferably, a rubber pad is provided between the chassis and the main beam, and a fixed connecting plate is provided on the lower outer side of the main beam. A waist-shaped bolt through hole is provided on the fixed connecting plate at a position that matches the chassis.

[0019] Preferably, the hook is in the shape of an "I", with one end connected to the movable end of the main hydraulic cylinder and the other end having a pin hole. The front end of the carriage is connected to the hook through a pin.

[0020] A detachable chassis structure for a vehicle body, manufactured according to the above scheme, is compatible with existing vehicle chassis without requiring modification. The chassis structure includes a lower chassis unit and an upper chassis unit. The upper chassis unit can move and lock on the lower chassis unit. This locking process is achieved through a power unit, which works in conjunction with the locking mechanism to ensure driving safety. The use of a power unit facilitates the separation and assembly of the vehicle and the cargo box, eliminating the need for operators to crawl under the vehicle for locking operations. Furthermore, the power unit of this invention includes a secondary hydraulic cylinder and a primary hydraulic cylinder. The secondary hydraulic cylinder is used to change the angle of the primary hydraulic cylinder. This design allows the main hydraulic cylinder to be detached from the carriage via a hook. The main hydraulic cylinder is primarily used for the movement of the upper underframe unit on the lower underframe unit. Furthermore, the locking mechanism of this invention not only locks the vehicle and carriage but also positions them. Additionally, by using rubber pads and through-holes for waist-shaped bolts on the fixed connecting plate, the height of the carriage can be finely adjusted according to the weight of the cargo, improving vehicle stability and providing shock absorption. This design features no alteration to the existing vehicle chassis structure, reduced labor intensity, easy separation and assembly of the vehicle and carriage, and a robust locking mechanism to enhance driving safety. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a structural schematic diagram of another state of the present invention.

[0023] Figure 3 This is a structural schematic diagram of the lower base frame unit of this utility model.

[0024] Figure 4 This is a structural schematic diagram of the carriage and upper frame unit of this utility model.

[0025] Figure 5 for Figure 1 A magnified view of part A in the middle.

[0026] Figure 6 This is a schematic diagram of the front end of the carriage of this utility model.

[0027] Figure 7 It is a structure schematic view of the hook of the utility model.

[0028] Figure 8 It is a structure schematic view of the ground support of the utility model.

[0029] Figure 9 It is a structure schematic view when the square tube pin is locked.

[0030] In the drawing: 1, chassis; 2, vehicle head; 3, vehicle compartment; 4, main beam; 5, slide; 6, guide block; 7, auxiliary hydraulic oil cylinder; 8, main hydraulic oil cylinder; 9, first connecting support; 10, second connecting support; 11, oil cylinder support; 12, hook; 13, auxiliary beam; 14, steel pipe; 15, conical rod; 16, inverted L-shaped blocking rod; 17, square tube pin; 18, reinforced connecting rod; 19, connecting plate; 20, connecting plate; 21, ground support oil cylinder; 22, square tube pin locking rod; 23, rubber pad; 24, fixed connecting plate; 25, waist-shaped bolt through hole; 26, pin hole. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0032] Referring to Figures 1-4 the drawing, a detachable chassis structure of a vehicle compartment includes a chassis 1, a vehicle head 2 arranged at the front end of the chassis 1, and a vehicle compartment 3 arranged at the top of the chassis 1. The top of the chassis 1 is provided with a lower chassis unit. The bottom of the vehicle compartment 3 is provided with an upper chassis unit capable of moving on and locking with the lower chassis unit. The lower chassis unit includes a sliding locking part and a power part. The upper part of the power part is detachably connected with the vehicle compartment 3. The utility model is based on the modification of the existing vehicle chassis and vehicle compartment. The detachable structure of the vehicle and the vehicle compartment is realized without affecting the structure of the vehicle itself and the driving safety on the basis of reducing the cost. The top of the chassis 1 is provided with the lower chassis unit. The bottom of the vehicle compartment 3 is provided with the upper chassis unit. The power part in the lower chassis unit cooperates with the upper chassis unit to realize the movement and locking of the upper chassis unit on the sliding locking part in the lower chassis unit. The power sources for the above movement, locking and locking separation all come from the power part. Therefore, manual separation and assembly of the vehicle and the vehicle compartment are not needed. Personnel are not needed to enter the lower part of the vehicle chassis to perform locking operation.

[0033] Further, referring to Figures 1-4 the drawing, the bottom of the sliding locking part is fixedly connected with the chassis 1. The top of the sliding locking part is adapted to the upper chassis unit at the bottom of the vehicle compartment 1, for realizing the movement and locking of the upper chassis unit.

[0034] The power part is fixedly connected with the sliding locking part, and is detachably connected with the front end of the carriage 3, and is used for fixing the carriage 3 in cooperation with the sliding locking part.

[0035] Further, referring to Fig. 1, Figures 1-4 The sliding locking part comprises two parallel main beams 4 connected with the chassis 1, a slide 5 is arranged at the middle position of the main beam 4, and a guide block 6 higher than the main beam 4 and used for guiding is arranged at the two sides of the main beam 4, and the main beam 4 is provided with a locking part used for locking the upper chassis unit. The slide 5 of the utility model can adopt the scheme in the prior art, and can also directly use nylon material; the main beam 4 is not only used for being fixedly connected with the chassis, but also provides mounting positions for the slide 5, the guide block 6 and the locking part; the slide 5 can be matched with the auxiliary beam 13, so that the auxiliary beam 13 can slide on the slide 5 and generate displacement; the guide block 6 can guide the auxiliary beam 13 during the sliding process of the auxiliary beam 13, and can limit the left-right direction of the auxiliary beam 13 after the sliding of the auxiliary beam 13 is completed; therefore, the guide block 6 can be multiple and be uniformly distributed at the two sides of each main beam 4.

[0036] Further, referring to Fig. 1, Figure 1 , 3The power unit includes a sub-hydraulic cylinder 7 and a main hydraulic cylinder 8, a first connecting support 9 for fixing the sub-hydraulic cylinder 7 is arranged at the front part between the two main beams 4, a second connecting support 10 for fixing the main hydraulic cylinder 8 is arranged at the rear part between the two main beams 4, and a cylinder support 11 for supporting and fixing the movable end of the main hydraulic cylinder 8 is arranged at the middle part between the two main beams 4; the movable end of the sub-hydraulic cylinder 7 is connected with the middle part of the fixed end of the main hydraulic cylinder 8, and the movable end of the main hydraulic cylinder 8 is movably connected with the front end of the carriage 3 through a hook 12. In the utility model, the fixed end of the sub-hydraulic cylinder 7 is connected with the two main beams 4 through the first connecting support 9, the movable end of the sub-hydraulic cylinder 7 is connected with the main hydraulic cylinder 8, and the angle of the main hydraulic cylinder 8 is adjusted (when it is needed to place the carriage on the ground from the vehicle or connect the vehicle with the carriage, the angle of the main hydraulic cylinder 8 needs to be changed so that the main hydraulic cylinder 8 is connected with the front end of the carriage 3 through the hook 12), the fixed end of the main hydraulic cylinder 8 is connected with the two main beams 4 through the second connecting support 10, and the movable end of the main hydraulic cylinder 8 is connected with the carriage 3, and is used for pushing the carriage 3 to move, which means that the carriage moves to the end of the chassis 1 when it is separated from the vehicle, and moves to the front end of the chassis 1 when it is combined with the vehicle; meanwhile, the first connecting support 9, the second connecting support 10 and the cylinder support 11 are arranged to make the structure between the two main beams 4 firm and reliable; and the hook 12 is arranged on the front end of the carriage 3, and is movably connected with the two sides of the recess. Figure 4 and Figure 6 It can be known that the recess is arranged on the middle position of the front end of the carriage 3, and the hook 12 is arranged in the recess and is movably connected with the two sides of the recess.

[0037] Further, referring to Figure 1 、 2 and 4, the upper chassis unit includes a sub-beam 13 matched with the lower chassis unit, the top of the sub-beam 13 is fixedly connected with the bottom of the carriage 3, and the sub-beam 13 is provided with a locking part. The sub-beam 13 of the utility model is used for being connected with the carriage 3 on one hand, and is used for moving on the slide 5 as a sliding block on the other hand, and simultaneously provides a position for the installation of the locking part.

[0038] Further, referring to Figure 1 、 2, 4, 6, the locking member is a steel pipe 14 arranged at the front of the main beam 4, and the locked member is a tapered rod 15 arranged at the front of the auxiliary beam 13 and matched with the inner diameter of the steel pipe 14. The locking member of the utility model can be but not limited to the above structure, and the structure is realized by inserting the tapered rod 15 into the steel pipe 14, which specifically prevents the carriage 3 from moving upward, downward, leftward, rightward and forward, and the connection of the carriage 3 with the movable end of the main hydraulic cylinder 8 in the power part can avoid the displacement of the carriage 3 rearward; that is, the utility model realizes the locking between the carriage 3 and the vehicle through the above structure; meanwhile, the above structure can also limit the position of the carriage 3, that is, when the tapered rod 15 is closely matched with the steel pipe 14, the relative position of the carriage 3 and the vehicle is appropriate.

[0039] Further, referring to Figure 3 、 4 , 9, the locking member is an inverted L-shaped blocking rod 16 arranged at the rear of the main beam 4, and the locked member is a square tube pin 17 arranged between the auxiliary beams 13. In the above structure, the short side of the inverted L-shaped blocking rod 16 faces outward, and the upper part of the inverted L-shaped blocking rod 16 is higher than the top of the main beam 4, that is, after installation, a certain space is formed between the short side lower part of the L-shaped blocking rod 16 and the top of the main beam 4, when the relative position of the carriage 3 and the vehicle is appropriate, the square tube pin 17 is located between the short side lower part of the L-shaped blocking rod 16 and the top of the main beam 4, and the front part of the square tube pin 17 is limited by the long side of the inverted L-shaped blocking rod 16; the above method can position the carriage 3 forward, upward and downward through the square tube pin 17 (it should be noted that as described above, the guide block 6 can position the carriage 3 through the action of the auxiliary beam 13); and the connection of the carriage 3 with the movable end of the main hydraulic cylinder 8 in the power part can avoid the displacement of the carriage 3 rearward. The locking member can be used alone or in combination with the tapered rod 15 matched with the inner diameter of the steel pipe 14 as described above.

[0040] Further, referring to Figure 3 、 7 , 9, the rear part of the main beam 4 is provided with a reinforcing connecting rod 18, and the middle part of the reinforcing connecting rod 18 is provided with a ground support member;

[0041] The ground support piece comprises a connecting plate 19 connected with the reinforcing connecting rod 18, the lower part of the connecting plate 19 is hingedly connected with a ground support rod 20, the upper part of the connecting plate 19 is fixedly installed with a ground support oil cylinder 21, the movable end of the ground support oil cylinder 21 is connected with the ground support rod 20, and the top of the ground support rod 20 is provided with a square tube pin locking rod 22. Since the weight of the carriage 3 is concentrated on the rear part of the vehicle when the carriage 3 is separated from or combined with the vehicle, the rear wheels of the vehicle are prone to be damaged, and based on this, the ground support piece is arranged to apply a certain force to the ground by the ground support oil cylinder 21, so as to reduce the damage to the rear wheels of the vehicle. At the same time, when the carriage 3 is combined with the vehicle, the ground support oil cylinder 21 is retracted, and the square tube pin locking rod 22 acts on the rear part of the square tube pin 17 to limit the square tube pin 17 rearward (at this time, the front part of the square tube pin 17 is the long side of the inverted L-shaped blocking rod 16, the upper part of the square tube pin 17 is the short side of the inverted L-shaped blocking rod 16, the lower part of the square tube pin 17 is the top of the main beam 4, and the rear part of the square tube pin 17 is the square tube pin locking rod 22), the above limiting can realize the locking of the square tube pin 17, and further realize the locking of the carriage 3, so as to realize the driving safety.

[0042] Further, as shown in Figure 1 、 5 , the chassis 1 and the main beam 4 are provided with a rubber pad 23, the outer lower part of the main beam 4 is provided with a fixed connecting plate 24, and the fixed connecting plate 24 is provided with a waist-shaped bolt through hole 25 at a position matched with the chassis 1. The rubber pad 23 can buffer the carriage to improve the stability, and the fixed connecting plate 24 with the waist-shaped bolt through hole 25 can cooperate to realize the height reduction (fine adjustment) of the carriage 3 according to the load of the carriage 3, so as to improve the overall stability of the vehicle.

[0043] Further, as shown in Figure 1 、 3 , 6, 8, the hook 12 is in the shape of "one", one end thereof is connected with the movable end of the main hydraulic oil cylinder 8, and the other end is provided with a pin hole 26, and the front end of the carriage 3 is connected with the hook 12 through a pin column. The hook 12 of the utility model is different from the traditional hook, which not only needs to realize the detachable connection of the carriage 3 and the power part, but also needs to cooperate with the locking piece to lock the carriage 3 during driving of the vehicle, and compared with the traditional hook, the above structure can effectively prevent misdisconnection, so as to ensure the driving safety of the vehicle. As shown in Figure 4 and Figure 6 , a groove is arranged at the middle position of the front end of the carriage 3, the hook 12 is arranged in the groove and movably connected with the two sides of the groove. As shown in Figure 4 and Figure 6 , a groove is arranged at the middle position of the front end of the carriage 3, the hook 12 is arranged in the groove, and corresponding through pin holes can be arranged on the grooves corresponding to the two sides of the pin hole 26 for passing the pin column.

[0044] The utility model discloses a working principle for: the utility model can realize one this type's car cooperation multiple this type's carriages 3 use, and the carriage 3 can be used alone, is used for selling goods, receiving work etc., when needing to move, make vehicle and carriage 3 combination together, and use vehicle to transport carriage 3 to the designated position, is two to break away from each other just can, when needing to combine vehicle and carriage 3, first, start ground prop oil cylinder 21 and make ground prop rod 20 prop up the ground, then start deputy hydraulic oil cylinder 7, and the movable end of deputy hydraulic oil cylinder 7 stretches out and adjusts the angle of main hydraulic oil cylinder 8, makes the unhooking reach the corresponding position on the front end of carriage 3 and wears the pin post, at this time, vehicle and carriage 3 are connected, start deputy hydraulic oil cylinder 7 again, and the movable end of deputy hydraulic oil cylinder 7 is retracted, and at the same time, main hydraulic oil cylinder 8 makes the front end of carriage 3 by hook 12 and makes deputy beam 13 be in the upper portion of main beam 4 in the state of inclination, and the movable end of deputy hydraulic oil cylinder 7 continues to retract, finally makes deputy beam 13 be in the top of main beam 4 and the bottom of carriage 3 and chassis 1 be in parallel state, then, start main hydraulic oil cylinder 8, and the movable end of main hydraulic oil cylinder 8 stretches out, drives the front of carriage 3 to move to the direction of head 2, in the above-mentioned process, deputy beam 13 is guided under the action of guide block and continues to displace along main beam 4, and make the position of carriage 3 and chassis 1 adapt, when being in the state of adaptation, taper rod 15 is inserted into the inner diameter of steel pipe 14, square tube pin 17 is in the half-enclosed space formed by the short side of inverted L-shaped stopper 16, the top of main beam 4 and the long side of inverted L-shaped stopper 16, finally, start ground prop oil cylinder 21 and make ground prop rod 20 retract, ground prop rod 20 retracts simultaneously and drives square tube pin locking rod 22 upwards, finally makes, the front of square tube pin 17 is the long side of inverted L-shaped stopper 16, the upper portion of square tube pin 17 is the short side of inverted L-shaped stopper 16, the lower portion of square tube pin 17 is the top of main beam 4 (in the utility model, main beam 4 is one of main components, for the convenience of expression, therefore replaces slide 5 by main beam 4), the rear of square tube pin 17 is square tube pin locking rod 22, and square tube pin 17 is locked. When needing to separate vehicle and carriage 3, start ground prop oil cylinder 21 and make ground prop rod 20 prop up the ground, at this time, square tube pin locking rod 22 is away from square tube pin 17, and square tube pin 17 is in half-enclosed state, secondly, start main hydraulic oil cylinder 8, and the movable end of main hydraulic oil cylinder 8 is retracted, drives the front of carriage 3 to move to the direction of being away from head 2, in the above-mentioned process, taper rod 15 is pulled out from the inner diameter of steel pipe 14, and square tube pin 17 is separated from the above-mentioned half-enclosed space, main hydraulic oil cylinder 8 continues to retract, finally makes the front of carriage 3 be in the rear end of chassis 1, start deputy hydraulic oil cylinder 7 again, and the movable end of deputy hydraulic oil cylinder 7 stretches out and adjusts the angle of main hydraulic oil cylinder 8, makes main hydraulic oil cylinder 8 drive carriage 3 by hook 12 and continuously makes the movable end of deputy hydraulic oil cylinder 7 stretch out and make carriage 3 finally fall on the ground, take out pin post, can realize the separation of carriage 3 and chassis 1, finally start deputy hydraulic oil cylinder 7, and make its movable end retract, start ground prop oil cylinder 21 and make ground prop rod 20 retract.The power for the above-mentioned moving, locking and locking separation in the above-mentioned process is from the power part, so that the vehicle and the carriage are directly separated and assembled without manual operation, and personnel do not need to enter the lower part of the vehicle chassis to perform the locking operation.

[0045] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations 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 detachable chassis structure of a carriage, comprising a chassis (1) and a front end (2) arranged at the front end of the chassis (1), and a carriage (3) arranged at the top of the chassis (1), characterized in that: The top of the chassis (1) is provided with a lower chassis unit; The bottom of the carriage (3) is provided with an upper chassis unit capable of moving and locking on the lower chassis unit; The lower chassis unit comprises a sliding locking part and a power part, and the upper part of the power part is detachably connected with the carriage (3).

2. A detachable underframe structure for a vehicle body according to claim 1, characterized in that: The bottom of the sliding locking part is fixedly connected with the chassis (1), and the top of the sliding locking part is matched with the upper chassis unit at the bottom of the carriage (3) to realize the movement and locking of the upper chassis unit. The power part is fixedly connected with the sliding locking part, and is detachably connected with the front end of the carriage (3) to fix the carriage (3) in cooperation with the sliding locking part.

3. A detachable underframe structure for a vehicle body according to claim 2, characterized in that: The sliding locking part comprises two main beams (4) connected with the chassis (1) and arranged in parallel, a slide (5) is arranged at the middle position of the main beam (4), guide blocks (6) higher than the main beam (4) and used for guiding are arranged at both sides of the main beam (4), and the main beam (4) is provided with a locking part used for locking the upper chassis unit.

4. A detachable undercarriage structure for a vehicle bed as defined in claim 3, wherein: The power part comprises a secondary hydraulic cylinder (7) and a main hydraulic cylinder (8), a first connecting support (9) for fixing the secondary hydraulic cylinder (7) is arranged at the front part between the two main beams (4), a second connecting support (10) for fixing the main hydraulic cylinder (8) is arranged at the rear part between the two main beams (4), and a cylinder support (11) for supporting and fixing the movable end of the main hydraulic cylinder (8) is arranged at the middle part between the two main beams (4); the movable end of the secondary hydraulic cylinder (7) is connected with the middle part of the fixed end of the main hydraulic cylinder (8), and the movable end of the main hydraulic cylinder (8) is movably connected with the front end of the carriage (3) through a hook (12).

5. A detachable undercarriage structure for a vehicle bed as defined in claim 3, wherein: The upper chassis unit comprises a secondary beam (13) matched with the lower chassis unit, the top of the secondary beam (13) is fixedly connected with the bottom of the carriage (3), and the secondary beam (13) is provided with a locking part.

6. A detachable undercarriage structure for a vehicle bed as defined in claim 4, wherein: The locking part is a steel pipe (14) arranged at the front part of the main beam (4), and the locking part is a conical rod (15) arranged at the front part of the secondary beam (13) and matched with the inner diameter of the steel pipe (14).

7. A detachable underframe structure for a vehicle body according to claim 4 or 6, characterized in that: The locking part is an inverted L-shaped blocking rod (16) arranged at the rear part of the main beam (4), and the locking part is a square tube pin (17) arranged between the secondary beams (13).

8. A detachable undercarriage structure for a vehicle bed as defined in claim 7, wherein: The rear part between the main beams (4) is provided with a reinforcing connecting rod (18), and the middle part of the reinforcing connecting rod (18) is provided with a ground support part. The ground support part comprises a connecting plate (19) connected with the reinforcing connecting rod (18), a ground support rod (20) hingedly connected to the lower part of the connecting plate (19), and a ground support cylinder (21) fixedly installed on the upper part of the connecting plate (19), wherein the movable end of the ground support cylinder (21) is connected with the ground support rod (20), and the top of the ground support rod (20) is provided with a square tube pin locking rod (22).

9. A detachable undercarriage structure for a vehicle bed as defined in claim 3, wherein: The chassis (1) and the main beam (4) are provided with a rubber pad (23), the outer lower part of the main beam (4) is provided with a fixed connecting plate (24), and a waist-shaped bolt through hole (25) is arranged at the position matched with the chassis (1) of the fixed connecting plate (24).

10. A detachable undercarriage structure for a vehicle bed as defined in claim 4, wherein: The hook (12) is in the shape of "one", one end of which is connected with the movable end of the main hydraulic cylinder (8), and the other end is provided with a pin hole (26), and the front end of the carriage (3) is connected with the hook (12) through a pin.

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