Foldable carrying vehicle

Abstract

The utility model relates to a foldable carrying vehicle which comprises two girders, a transverse frame arranged between the two girders, a carrying plate fixedly arranged above the transverse frame and a wheel overturning mechanism. The wheel turnover mechanism comprises a rotating shaft seat, a rotating part rotating around the rotating shaft seat, a fixed plate fixedly arranged on the rotating part and a wheel unit fixedly arranged on the other face of the fixed plate, the wheel unit comprises a damping structure connected with the fixed plate and a wheel, when an axle of the wheel is in a horizontal state, the fixed plate is horizontal, and when the axle is in a vertical state, the fixed plate is vertical; a first locking mechanism is arranged between the end, close to the wheel, of the fixing plate and the outer side face of the corresponding girder. When the foldable carrying vehicle is stored, the first locking mechanism is unlocked, the wheels are pulled to be parallel to the transverse frame, the occupied space of the carrying vehicle is reduced, when the foldable carrying vehicle is unfolded, only the wheels need to be pulled in the reverse direction, the fixing plate and the girder are locked through the first locking mechanism, and the foldable carrying vehicle is very convenient and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of cargo transportation machinery, in particular to a foldable cargo-carrying vehicle. Background Art

[0002] An airdrop vehicle is a vehicle fixed on an airdrop platform, which is slidably installed on a transport aircraft. During airdrop, the vehicle is airdropped together with the airdrop platform. Since the track width in the transport aircraft is relatively fixed, the size of the airdrop platform is also relatively fixed, and different materials or vehicles have different widths. For smaller materials or vehicles, such as Warriors, after the vehicle is placed on the airdrop platform, there is still a lot of space on both sides of the vehicle, which cannot be well utilized. On the one hand, it causes a waste of transport aircraft capacity. On the other hand, in the process of disaster relief and combat deployment, a large amount of materials and equipment need to be carried. Although some vehicles are highly maneuverable and adaptable, their loading capacity is limited and it is difficult to meet usage requirements.

[0003] How to reduce the waste of transport aircraft capacity and how to increase vehicle loading capacity are technical issues that need to be solved urgently. Utility Model Content

[0004] The purpose of the utility model is to provide a foldable cargo carrier so as to solve the above technical problems.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A foldable cargo carrier comprises a beam extending in a front-to-rear direction and arranged on both sides of the lateral direction, a cross frame arranged between the two beams, a cargo plate fixedly arranged above the cross frame, and a wheel flipping mechanism. The vertical width of the beam is greater than the vertical width of the cross frame. The wheel flipping mechanism comprises a rotating shaft seat fixedly arranged on the bottom surface of the cross frame near the beam, a rotating member rotating around the rotating shaft seat, a fixed plate fixedly arranged on the rotating member, and a wheel unit fixedly arranged on the other side of the fixed plate. The wheel unit comprises a shock-absorbing structure connected to the fixed plate and a wheel connected to the shock-absorbing structure through an axle. When the axle of the wheel is in a horizontal state, the fixed plate is horizontal and press-fitted with the bottom of the corresponding beam. When the axle is in a vertical state, the fixed plate is vertical. A first locking mechanism is provided between one end of the fixed plate adjacent to the wheel and the outer side surface of the corresponding beam.

[0007] Preferably, the outer end of the fixing plate has an upwardly bent clamping plate for clamping the outer side of the corresponding beam, and the outer end of the fixing plate also has a clamping block extending out of the outside of the beam. The first locking mechanism includes a clamping claw and an anti-detachment spring for preventing the clamping claw from falling off the clamping block. The middle part of the clamping claw is rotatably arranged on the outer side of the beam, one end of the anti-detachment spring is fixed on the outer side of the beam and the other end is fixed to the tail of the clamping claw. When the clamping claw is clamped on the clamping block, the anti-detachment spring is in a natural state or a stretched state.

[0008] Preferably, a second locking mechanism is also fixed to the bottom of the beam, and the second locking mechanism includes two vertical plates fixed to the bottom of the beam, a spring tube fixed between the two vertical plates, a compression spring fixed in the spring tube, and an insertion rod inserted in the compression spring and the vertical plate, the head of the insertion rod is used to be inserted under the fixed plate and the tail has a pull ring, and a baffle is arranged on the insertion rod between the compression spring and the front vertical plate, and the diameter of the baffle is larger than the diameter of the compression spring.

[0009] Preferably, it also includes two first telescopic rods with adjustable lengths, the two first telescopic rods are arranged in an eight-shaped shape, the upper ends of the two first telescopic rods are hingedly fixed to the middle of the bottom surface of the cross frame through upper connecting members, and the lower ends of the two first telescopic rods are hingedly fixed to the inner end of the axle through lower connecting members.

[0010] Preferably, the lower connecting member is a lower fixed column fixed on the axle, and the upper connecting member is two upper fixed columns fixed along the lateral interval in the middle part of the bottom surface of the cross frame, the first telescopic rod includes spherical bearings with internal threads at both ends, adjusting rods at both ends respectively screwed and connected to the corresponding spherical bearings, and an adjusting wrench sleeved on the adjusting rod, at least one spherical bearing is detachably connected to the corresponding fixed column, the adjusting rod includes threaded portions at both ends, a transition portion connected to the threaded portions, and an adjusting portion in the middle, the cross-section of the adjusting portion is a regular hexagon, the outer diameter of the transition portion is less than or equal to the inner diameter of the adjusting portion, the outer end of the threaded portion is screwed in the spherical bearing and an adjusting nut is screwed on the threaded portion, the adjusting wrench has a middle hexagonal socket that matches the adjusting portion, and outer hexagonal sockets located on both sides of the middle hexagonal socket for matching with the adjusting nut.

[0011] Preferably, a wheel restraint mechanism is also fixedly arranged in the middle of the bottom surface of the cross frame, and the wheel restraint structure includes a restraint tension spring fixed between two upper fixed columns and a restraint plate in the shape of an "X" fixed to the lower end of the restraint tension spring.

[0012] Preferably, the upper connecting member is a triangular connecting plate fixed to the middle part of the bottom surface of the cross frame, the triangular connecting plate has a hinge hole, the upper end of the first telescopic rod is hingedly fixed to the triangular connecting plate through a hinge shaft, and the lower connecting member is a hinge seat fixed to the inner end of the axle, and the lower end of the first telescopic rod is hingedly fixed to the hinge seat through a hinge shaft.

[0013] Preferably, the shock-absorbing structure is a leaf spring shock-absorbing structure, including a plurality of superimposed leaf springs and a U-shaped connecting piece for fixing the leaf springs, the front part of the bottom surface of the fixing plate has a U-shaped fixing plate, the front end of the leaf spring is hingedly fixed to the U-shaped fixing plate through a connecting shaft, the rear part of the bottom surface of the fixing plate has a sliding structure, the sliding structure includes a slot fixed to the bottom surface of the fixing plate, wear-resistant pads and sliding boots are respectively arranged in the slot from top to bottom, the wear-resistant pads are fixed to the bottom surface of the fixing plate, two hanging plates are fixed on the lower surface of the sliding boots, and the rear end of the leaf spring is hingedly fixed to the hanging plate through a connecting shaft.

[0014] Preferably, the inner side of the beam is pitch-hinged and connected to the frame, the connecting frame includes a front herringbone frame body and a rear parallel frame extending and connected to the herringbone frame body, the parallel frame is pitch-hinged on the beam through a horizontal axis, the herringbone frame body extends forward from the cross frame and the front end of the herringbone frame body is fixed with a horizontal connecting ring for connecting to the rear end of the front vehicle, the bottom of the cross frame is fixed with a third locking structure having the same structure as the second locking mechanism, and the plug of the third locking structure is inserted at the bottom of the parallel frame to play a limiting role.

[0015] Preferably, an auxiliary wheel mechanism is arranged on the rear side of the horizontal connecting ring, and the auxiliary wheel mechanism includes a sleeve rotatably mounted on the front part of the herringbone frame, a connecting steel pipe fixed on the sleeve, a flange plate fixed on the end of the connecting steel pipe, a fixed shaft fixed on the flange plate, a gate-shaped connecting plate rotatably arranged on the fixed shaft, and an auxiliary wheel rotatably arranged in the gate-shaped connecting plate, a radial positioning through hole is arranged on the front part of the herringbone frame, a radial positioning socket is arranged on the sleeve, and a positioning pin is passed through the sleeve and the positioning through hole to position the auxiliary wheel.

[0016] The foldable cargo carrier of the utility model can be stored by unlocking the first locking mechanism and turning the wheels to make them parallel to the cross frame, which greatly reduces the space occupied by the cargo carrier. When unfolding, it is only necessary to turn the wheels in the opposite direction and lock the fixing plate and the beam through the first locking mechanism, which is very convenient and efficient. It is suitable for scenes such as transporting goods in factories and carrying combat equipment during rapid airborne deployment. For example, during airborne, the cargo carrier can be folded and fixed on both sides of military vehicles such as Mengshi, and the remaining space on the airborne pallet is used to improve the utilization rate of the airborne pallet. After landing, the cargo carrier can be quickly unfolded, the equipment can be loaded, and the military vehicle can pull the cargo carrier for rapid deployment.

[0017] Furthermore, the outer end of the fixed plate also has a clamping block extending out of the outside of the beam, which cooperates with the rotating shaft seat to prevent the fixed plate from swinging horizontally. The clamping claw is clamped on the clamping block to inhibit the tendency of the fixed plate and the beam to separate in the vertical direction. The anti-detachment tension spring can prevent the clamping claw from falling off the clamping block.

[0018] Furthermore, a second locking mechanism is fixedly arranged at the bottom of the beam, and the head of the insertion rod of the second locking mechanism is inserted under the fixing plate to further prevent the fixing plate from being separated from the beam in the vertical direction.

[0019] Furthermore, a lower fixed column is fixed on the axle, and two upper fixed columns are fixed at intervals along the lateral direction in the middle of the bottom surface of the cross frame. A first telescopic rod with adjustable length is connected between the lower fixed column and the corresponding upper fixed column. The first telescopic rod is rotated by adjusting the wrench, and then the screw-in depth of the first telescopic rod in the joint bearing is adjusted to ensure that the wheel is fully extended and prevent the wheel from deflecting inward. At the same time, when storing the wheel, it is only necessary to remove the corresponding joint bearing from the fixed column. After the first telescopic rod is adjusted to have a screw-in depth in the joint bearing, tightening the adjustment nut can prevent the first telescopic rod from loosening in the joint bearing and ensure the adjustment effect. The structure of the first telescopic rod and the structure of the adjustment wrench enable the adjustment wrench to not only screw the adjustment part, but also move to the threaded part to screw the adjustment nut, which is very convenient.

[0020] Furthermore, after the wheel is stored, the "X"-shaped constraint plate clamps the main wheel, which can constrain the wheel and ensure that the wheel is in an effective storage state.

[0021] Furthermore, the rear end of the leaf spring ensures stable compression and rebound of the leaf spring through a sliding structure.

[0022] Furthermore, the inner side of the beam is pitch-hinged and connected to the frame, and the bottom of the cross frame is fixed with a third locking structure having the same structure as the second locking mechanism. The plug of the third locking structure is inserted at the bottom of the parallel frame, which can prevent the connecting frame from detaching from the cross frame in the vertical direction during towing, causing the cargo vehicle to pitch up.

[0023] Furthermore, an auxiliary wheel mechanism is arranged on the rear side of the horizontal connecting ring, which supports the connecting frame and the carrier when the carrier is moved, and facilitates the movement of the carrier. The positioning pins and the positioning through holes passed through the sleeve cooperate with each other to position the auxiliary wheel mechanism in a vertical or horizontal state. After the connecting ring of the carrier is fixed to the rear of the front vehicle, the connecting steel pipe can be rotated to set the auxiliary wheel mechanism horizontally, and then the positioning pins are passed through the sleeve and the positioning through holes to position the auxiliary wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the rear structure of the foldable cargo carrier in the embodiment of the utility model;

[0025] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0026] Figure 3 This is a schematic diagram of the structure of the first locking mechanism in the embodiment of the utility model;

[0027] Figure 4 This is a structural schematic diagram of an adjusting wrench in an embodiment of the utility model;

[0028] Figure 5 It is a structural schematic diagram of the main beam, parallel frame, cross frame and the third locking structure in the embodiment of the utility model;

[0029] Figure 6 This is a structural schematic diagram of the main beam, the connecting frame and the auxiliary wheel mechanism in the embodiment of the utility model;

[0030] Figure 7 Another structural schematic diagram of the foldable cargo carrier in the embodiment of the utility model;

[0031] Figure 8 Another structural schematic diagram of the first telescopic rod, the upper connecting member and the lower connecting member in the embodiment of the utility model;

[0032] Fig. 9 It is a schematic diagram of the connection structure between the second telescopic rod and the axle in the embodiment of the utility model. DETAILED DESCRIPTION

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0034] Embodiments of the foldable cargo carrier, such as Figure 1-6 The method comprises a beam extending in the front-rear direction and arranged on both sides of the horizontal direction, a cross frame 15 arranged between the two beams, a loading plate 14 fixedly arranged above the cross frame, and a wheel turning mechanism. The vertical width of the beam is greater than the vertical width of the cross frame, and the cross frame is fixedly connected to the middle or upper part of the corresponding beam. The wheel turning mechanism comprises a rotating shaft seat 11 fixedly arranged on the bottom surface of the cross frame near the beam, a rotating member rotating around the rotating shaft seat, a fixed plate 9 fixedly arranged on the rotating member, and a wheel unit fixedly arranged on the other side of the fixed plate. Specifically, the rotating member comprises a rotating shaft 3 and a reinforcing plate 10 fixed on the rotating shaft 3. The wheel unit comprises a shock absorbing structure connected to the fixed plate and a wheel 4 connected to the shock absorbing structure through an axle. The fixed plate 9 is fixed on the reinforcing plate. When the axle 5 of the wheel is in a horizontal state, the fixed plate is horizontal and press-fitted with the bottom of the corresponding beam. When the axle 5 is in a vertical state, the fixed plate is vertical. A first locking mechanism is provided between one end of the fixed plate adjacent to the wheel and the outer side surface of the corresponding beam. A plurality of lifting rings 28 for conveniently lifting the cargo vehicle are arranged around the cargo vehicle.

[0035] The foldable cargo carrier of the utility model can be stored by unlocking the first locking mechanism and turning the wheels to make them parallel to the cross frame, which greatly reduces the space occupied by the cargo carrier. When unfolding, it is only necessary to turn the wheels in the opposite direction and lock the fixing plate and the beam through the first locking mechanism, which is very convenient and efficient. It is suitable for scenes such as transporting goods in factories and carrying combat equipment during rapid airborne deployment. For example, during airborne, the cargo carrier can be folded and fixed on both sides of military vehicles such as Mengshi, and the remaining space on the airborne pallet is used to improve the utilization rate of the airborne pallet. After landing, the cargo carrier can be quickly unfolded, the equipment can be loaded, and the military vehicle can pull the cargo carrier for rapid deployment.

[0036] The outer end of the fixed plate has a clamping plate 2 bent upward for clamping the outer side of the corresponding beam. The outer end of the fixed plate also has a clamping block 13 extending out of the outer side of the beam. The first locking mechanism includes a claw 27 and an anti-detachment spring 34 for preventing the claw from falling off the clamping block. The middle part of the claw is rotatably arranged on the outer side of the beam. One end of the anti-detachment spring is fixed on the outer side of the beam and the other end is fixed on the tail of the claw. When the claw is clamped on the clamping block, the anti-detachment spring is in a natural state or a stretched state. The outer end of the fixed plate also has a clamping block extending out of the outer side of the beam, which cooperates with the rotating shaft seat to prevent the fixed plate from swinging horizontally. The claw is clamped on the clamping block to suppress the tendency of the fixed plate and the beam to separate in the vertical direction. The anti-detachment spring can prevent the claw from falling off from the clamping block.

[0037] In this embodiment, a second locking mechanism is also fixed at the bottom of the beam. In the transverse direction, the second locking mechanism is located inside the first locking mechanism. The second locking mechanism includes two vertical plates 30 fixed at the bottom of the beam, a spring tube 31 fixed between the two vertical plates, a compression spring 32 fixed in the spring tube, and a plug rod 29 inserted in the compression spring and the vertical plate. The head of the plug rod is used to be inserted under the fixed plate and the tail has a pull ring 33. A baffle 35 is provided on the plug rod between the compression spring and the front vertical plate. The diameter of the baffle is larger than the diameter of the compression spring. A second locking mechanism is also fixed at the bottom of the beam. The head of the plug rod of the second locking mechanism is inserted under the fixed plate to further prevent the fixed plate from being separated from the beam in the vertical direction.

[0038] In order to further enhance the stability of the wheels during travel, the foldable cargo carrier also includes two first telescopic rods with adjustable lengths, the two first telescopic rods are arranged in an eight-shaped shape, the upper ends of the two first telescopic rods are hingedly fixed to the middle of the bottom surface of the cross frame through upper connecting members, and the lower ends of the two first telescopic rods are hingedly fixed to the inner end of the axle through lower connecting members. Specifically, in the present embodiment, the lower connecting member is a lower fixed column 36 fixed on the axle, and the upper connecting member is two upper fixed columns 42 and 44 fixed along the lateral interval in the middle of the bottom surface of the cross frame. A first telescopic rod with adjustable length is connected between the lower fixed column and the corresponding upper fixed column. After the wheels are folded and stored, the two upper fixed columns are located on the inner side of the axle. The first telescopic rod includes joint bearings 38 with internal threads at both ends, adjusting rods 40 respectively screwed and connected to the corresponding joint bearings at both ends, and an adjusting wrench 41 sleeved on the adjusting rod. At least one joint bearing is detachably connected to the corresponding fixed column. In the present embodiment, the lower part of the lower fixed column has a radial clamping hole, and the two free ends of the C-shaped clamp 37 are clamped into the clamping hole. The joint bearing 38 at the lower end and the lower fixed column 36 are detachably connected by the C-shaped clamp 37, and the joint bearing at the upper end and the upper fixed column can also be detachably connected by the same structure. The adjusting rod comprises a threaded portion at both ends, a transition portion connected to the threaded portion, and an adjusting portion in the middle, wherein the cross section of the adjusting portion is a regular hexagon, the outer diameter of the transition portion is less than or equal to the inner diameter of the adjusting portion, the outer end of the threaded portion is screwed in the joint bearing, and an adjusting nut 39 is screwed on the threaded portion, and the adjusting wrench has a middle hexagonal socket 401 that matches the adjusting portion and an outer hexagonal socket 402 that matches the adjusting nut and is located on both sides of the middle hexagonal socket. The first telescopic rod is rotated by the adjusting wrench, and then the screwing depth of the first telescopic rod in the joint bearing is adjusted to ensure that the wheel is stretched in place and prevent the wheel from deflecting inwardly. At the same time, when the wheel is stored, it is only necessary to remove the corresponding joint bearing from the fixed column. After the first telescopic rod is adjusted to the screwing depth in the joint bearing, tightening the adjusting nut can prevent the first telescopic rod from loosening in the joint bearing and ensure the adjustment effect. The structure of the first telescopic rod and the structure of the adjusting wrench enable the adjusting wrench to not only screw the adjusting portion, but also move to the threaded portion to screw the adjusting nut, which is very convenient.

[0039] A wheel restraint mechanism is also fixedly arranged in the middle of the bottom surface of the cross frame. The wheel restraint structure includes a restraint tension spring 43 fixed between two upper fixed columns and a cross-shaped restraint plate 45 fixed at the lower end of the restraint tension spring, which can restrain the wheel and ensure that the wheel is in an effective storage state.

[0040] The shock-absorbing structure adopts a leaf spring shock-absorbing structure, which is a prior art and includes a plurality of superimposed leaf springs 6 and a U-shaped connector 7 for fixing the leaf springs. The front part of the bottom surface of the fixing plate has a U-shaped fixing plate (not shown in the figure), and the front end of the leaf spring is hingedly fixed to the U-shaped fixing plate through a connecting shaft. The ingenuity of this embodiment lies in that a sliding structure is arranged at the rear part of the bottom surface of the fixing plate, and the sliding structure includes a slot 8 fixed to the bottom surface of the fixing plate, and wear-resistant pads 46 and sliding boots 47 are arranged in the slot from top to bottom, respectively. The wear-resistant pad is fixed to the bottom surface of the fixing plate, and two hanging plates 48 are fixed on the lower surface of the sliding boot. The rear end of the leaf spring is hingedly fixed to the hanging plate through a connecting shaft, and the bottom of the slot has a long hole (not shown in the figure) for the hanging plate 48 to slide forward and backward. During the compression and rebound process of the leaf spring, the sliding boot slides forward and backward, and the wear-resistant pad has a damping effect, thereby ensuring the stability of the compression and rebound of the leaf spring, thereby increasing the stability of the vehicle operation.

[0041] The inner side of the beam is pitch-hinged and connected to the frame. The connecting frame includes a front herringbone frame body 21 and a rear parallel frame 19 extending from the herringbone frame body. The parallel frame is pitch-hinged on the beam through a horizontal axis 20. The herringbone frame body extends forward from the cross frame and the front end of the herringbone frame body is fixed with a horizontal connecting ring 22 for connecting to the rear of the front vehicle. The bottom of the cross frame is fixed with a third locking structure. The third locking structure has the same structure as the second locking mechanism and will not be described in detail here. The plug of the third locking structure is inserted at the bottom of the parallel frame to play a limiting role. The plug of the third locking structure is inserted at the bottom of the parallel frame to prevent the connecting frame from being separated from the cross frame in the vertical direction during the towing process, causing the cargo vehicle to tilt upward.

[0042] An auxiliary wheel mechanism is arranged on the rear side of the horizontal connecting ring, and the auxiliary wheel mechanism includes a sleeve 51 rotatably mounted on the front part of the herringbone frame, a connecting steel pipe 52 fixed on the sleeve, a flange plate 55 fixed on the end of the connecting steel pipe, a fixed shaft 56 fixed on the flange plate, a gate-shaped connecting plate 53 rotatably arranged on the fixed shaft, and an auxiliary wheel 54 rotatably arranged in the gate-shaped connecting plate. A positioning through hole 57 is radially arranged on the front part of the herringbone frame. In the present embodiment, a vertical positioning through hole and a horizontal positioning through hole are arranged. A positioning socket is radially arranged on the sleeve. In the present embodiment, only one positioning socket is arranged. A positioning pin 50 is passed through the sleeve and the positioning through hole 57 to position the auxiliary wheel. An auxiliary wheel mechanism is arranged on the rear side of the horizontal connecting ring. When the cargo vehicle is moved, the connecting frame and the cargo vehicle are supported, and the movement of the cargo vehicle is convenient. The positioning pins and the positioning through holes passed through the sleeve cooperate with each other to position the auxiliary wheel mechanism in a vertical or horizontal state. After the cargo vehicle connecting ring is fixed to the rear of the front vehicle, the connecting steel pipe can be rotated to set the auxiliary wheel mechanism horizontally, and then the positioning pins are passed through the sleeve and the positioning through holes to position the auxiliary wheel.

[0043] A connecting seat (not shown) is fixed on the bottom surface of the rear of the horizontal frame. The connecting seat includes an upper plate and a lower plate. There is a slot between the upper plate and the lower plate for inserting the horizontal connecting ring. The upper plate and the lower plate are provided with plug holes opposite to each other. In this way, multiple cargo carriers can be connected as needed to increase the transportation capacity.

[0044] In this embodiment, four square tubes are welded on the upper surface of the fixing plate to form a rectangular frame 58, which can facilitate loading and unloading of goods on the cargo vehicle and can also restrain the goods to a certain extent to prevent the goods from sliding off the fixing plate.

[0045] It should be noted that there is a shock-absorbing pad 24 between the fixing plate 9 and the bottom of the beam 1, and there is a shock-absorbing pad between the upper surface of the parallel frame 19 and the cross frame 15 to reduce vibration and impact noise.

[0046] Compared with Example 1, the difference is that Figure 7 As shown, the front and rear ends of the horizontal frame are hingedly provided with front and rear railings 16 and 25, and the side railings 18 are hingedly provided on the beams. A three-fold hinge 12 is provided between the rear railing and the horizontal frame. The side railings are fixed to the front and rear railings by a fixing mechanism. The fixing mechanism is a prior art, including a U-shaped card plate fixed on the side railings and an L-shaped locking rod 17 rotatably provided on the front and rear railings. A three-fold hinge is provided between the rear railing and the horizontal frame, so that the rear railing can be opened backwards for loading convenience, and can also be attached forward to the cargo vehicle for folding and storage convenience.

[0047] Compared with Example 1, the difference is that Figure 8 As shown, the upper connecting member is a triangular connecting plate 59 welded and fixed to the middle of the bottom surface of the horizontal frame, or a U-shaped connecting rod is welded to the middle of the bottom surface of the horizontal frame, the triangular connecting plate 59 is rotatably sleeved on the connecting rod, and the two corners below the triangular connecting plate have hinge holes, the upper end of the first telescopic rod 61 is hinged and fixed to the triangular connecting plate through a hinge shaft, and the lower connecting member is a hinge seat 60 fixed to the inner end of the axle, and the lower end of the first telescopic rod is hinged and fixed to the hinge seat through a hinge shaft. In this embodiment, Figure 8 The first telescopic rod shown is prior art and can be purchased on the market, so it will not be described in detail here.

[0048] Compared with Example 1, the difference is that Fig. 9 As shown, a wheel swing suppression mechanism is arranged inside the leaf spring damping structure, and the wheel swing suppression mechanism includes two second telescopic rods 62 and a hinge plate 63. The middle of the hinge plate is fixed on the axle 5, and the two ends of the hinge plate are respectively hinged to the corresponding second telescopic rods 62, and the other ends of the second telescopic rods 62 are respectively hinged and fixed to the bottom of the corresponding fixed plate. By adjusting the second telescopic rod 62, the position of the axle 5 is limited, thereby limiting the swing of the wheel in the lateral direction.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A foldable cargo carrier, characterized in that: It includes a beam extending in the front-to-back direction and arranged on both sides of the lateral direction, a cross frame arranged between the two beams, a loading plate fixedly arranged above the cross frame, and a wheel flipping mechanism. The vertical width of the beam is greater than the vertical width of the cross frame. The wheel flipping mechanism includes a rotating shaft seat fixedly arranged on the bottom surface of the cross frame near the beam, a rotating member rotating around the rotating shaft seat, a fixed plate fixedly arranged on the rotating member, and a wheel unit fixedly arranged on the other side of the fixed plate. The wheel unit includes a shock-absorbing structure connected to the fixed plate and a wheel connected to the shock-absorbing structure through an axle. When the axle of the wheel is in a horizontal state, the fixed plate is horizontal and press-fitted with the bottom of the corresponding beam. When the axle is in a vertical state, the fixed plate is vertical. A first locking mechanism is provided between an end of the fixed plate adjacent to the wheel and the outer side surface of the corresponding beam.

2. The foldable cargo carrier according to claim 1, characterized in that: The outer end of the fixing plate has an upwardly bent clamping plate for clamping the outer side of the corresponding beam. The outer end of the fixing plate also has a clamping block extending out of the outside of the beam. The first locking mechanism includes a clamping claw and an anti-detachment spring for preventing the clamping claw from falling off the clamping block. The middle part of the clamping claw is rotatably arranged on the outer side of the beam. One end of the anti-detachment spring is fixed on the outer side of the beam and the other end is fixed to the tail of the clamping claw. When the clamping claw is clamped on the clamping block, the anti-detachment spring is in a natural state or a stretched state.

3. The foldable cargo carrier according to claim 2, characterized in that: A second locking mechanism is also fixed to the bottom of the beam, and the second locking mechanism includes two vertical plates fixed to the bottom of the beam, a spring tube fixed between the two vertical plates, a compression spring fixed in the spring tube, and an insertion rod inserted in the compression spring and the vertical plate. The head of the insertion rod is used to be inserted under the fixed plate and the tail has a pull ring. A baffle is arranged on the insertion rod between the compression spring and the front vertical plate, and the diameter of the baffle is larger than the diameter of the compression spring.

4. The foldable cargo carrier according to claim 3, characterized in that: It also includes two first telescopic rods with adjustable lengths, which are arranged in an eight-shaped shape, and the upper ends of the two first telescopic rods are hingedly fixed to the middle of the bottom surface of the cross frame through upper connecting members, and the lower ends of the two first telescopic rods are hingedly fixed to the inner end of the axle through lower connecting members.

5. The foldable cargo carrier according to claim 4, characterized in that: The lower connecting member is a lower fixed column fixed on the axle, and the upper connecting member is two upper fixed columns fixed along the lateral interval in the middle of the bottom surface of the cross frame. The first telescopic rod includes spherical bearings with internal threads at both ends, adjusting rods at both ends respectively screwed and connected to the corresponding spherical bearings, and an adjusting wrench sleeved on the adjusting rod. At least one spherical bearing is detachably connected to the corresponding fixed column. The adjusting rod includes threaded portions at both ends, a transition portion connected to the threaded portions, and an adjusting portion in the middle. The cross-section of the adjusting portion is a regular hexagon, and the outer diameter of the transition portion is less than or equal to the inner diameter of the adjusting portion. The outer end of the threaded portion is screwed in the spherical bearing and an adjusting nut is screwed on the threaded portion. The adjusting wrench has a middle hexagonal socket that matches the adjusting portion and outer hexagonal sockets located on both sides of the middle hexagonal socket for matching the adjusting nut.

6. The foldable cargo carrier according to claim 5, characterized in that: A wheel restraint mechanism is also fixedly arranged in the middle of the bottom surface of the cross frame, and the wheel restraint structure comprises a restraint tension spring fixed between two upper fixed columns and a restraint plate in the shape of an "X" fixed at the lower end of the restraint tension spring.

7. The foldable cargo carrier according to claim 4, characterized in that: The upper connecting member is a triangular connecting plate fixed to the middle part of the bottom surface of the cross frame, the triangular connecting plate has a hinge hole, the upper end of the first telescopic rod is hingedly fixed to the triangular connecting plate through a hinge shaft, and the lower connecting member is a hinge seat fixed to the inner end of the axle, and the lower end of the first telescopic rod is hingedly fixed to the hinge seat through a hinge shaft.

8. The foldable cargo carrier according to claim 6, characterized in that: The shock-absorbing structure is a leaf spring shock-absorbing structure, which includes a plurality of superimposed leaf springs and a U-shaped connector for fixing the leaf springs. The front part of the bottom surface of the fixing plate has a U-shaped fixing plate. The front end of the leaf spring is hingedly fixed to the U-shaped fixing plate through a connecting shaft. The rear part of the bottom surface of the fixing plate has a sliding structure. The sliding structure includes a slot fixed to the bottom surface of the fixing plate. Wear-resistant pads and sliding boots are respectively arranged in the slot from top to bottom. The wear-resistant pads are fixed to the bottom surface of the fixing plate. Two hanging plates are fixed on the lower surface of the sliding boots. The rear end of the leaf spring is hingedly fixed to the hanging plate through a connecting shaft.

9. The foldable cargo carrier according to any one of claims 1 to 8, characterized in that: The inner side of the beam is pitch-hinged and connected with the connecting frame, and the connecting frame includes a front herringbone frame body and a rear parallel frame extending and connected with the herringbone frame body, the parallel frame is pitch-hinged on the beam through a horizontal axis, the herringbone frame body extends forward from the cross frame and the front end of the herringbone frame body is fixed with a horizontal connecting ring for connecting with the rear end of the front vehicle, the bottom of the cross frame is fixed with a third locking structure with the same structure as the second locking mechanism, and the plug of the third locking structure is inserted at the bottom of the parallel frame to play a limiting role.

10. The foldable cargo carrier according to claim 7, characterized in that: An auxiliary wheel mechanism is arranged on the rear side of the horizontal connecting ring, and the auxiliary wheel mechanism includes a sleeve rotatably mounted on the front part of the herringbone frame, a connecting steel pipe fixed on the sleeve, a flange plate fixed on the end of the connecting steel pipe, a fixed shaft fixed on the flange plate, a gate-shaped connecting plate rotatably arranged on the fixed shaft, and an auxiliary wheel rotatably arranged in the gate-shaped connecting plate. A positioning through hole is radially arranged on the front part of the herringbone frame, a positioning socket is radially arranged on the sleeve, and a positioning pin is passed through the sleeve and the positioning through hole to position the auxiliary wheel.

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