Cargo transfer device for a vehicle compartment

Abstract

The application provides a goods transfer device of a carriage, and belongs to the technical field of logistics transportation devices. The goods transfer device of the present application can greatly improve the flexibility and efficiency of goods unloading, and has the advantages of being light and practical.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of logistics transportation devices, and relates to a cargo transfer device of a carriage. BACKGROUND

[0002] When a truck is unloading cargo, a forklift is generally used to move the cargo away from the edge of the carriage floor, so the cargo needs to be moved on the carriage floor. However, when the cargo is moved on the carriage floor, the sliding friction is large, and it is very laborious and difficult to move and position large and heavy cargo on the floor, so the traditional cargo loading and unloading process is very troublesome.

[0003] In view of the above problems, patent (application number: CN201920357936.8) discloses a wheel-chain hybrid vehicle-mounted automatic loading and unloading device, which comprises a hidden roller support device, a hidden chain transmission device and a filling plate. The loading and unloading device is assembled into a set of wheel-chain hybrid vehicle-mounted automatic loading and unloading device through multiple sets of hidden roller support devices, hidden chain transmission devices and filling plates. When the equipment needs to work, the air belt is used to lift the rollers and chains, and the cargo is lifted. The chain drives the cargo to quickly enter and exit the carriage. Although the device can facilitate the movement of the cargo in the carriage and realize the automatic loading and unloading of the cargo, it still has the following disadvantages: under normal circumstances, ordinary carriages usually have only a carriage door at the tail, and the cargo needs to be loaded and unloaded from the tail door. If different cargos are transported in the carriage, and the cargo to be unloaded is not close to the door, the loading and unloading device cannot realize the flexible turnover of the cargo for unloading, but the cargo close to the outside of the carriage needs to be unloaded first, and then the cargo close to the inside of the carriage can be unloaded. This unloading method is troublesome, wastes manpower and takes a long time to operate.

[0004] At present, in order to solve this problem, people usually choose a carriage with a side door that can be opened, and realize the separate unloading of cargos at different positions in the vehicle through the side door; or use a non-box type flatbed truck, and then use a hoisting device to hoist the cargo at different positions in the vehicle to realize the unloading of the cargo. SUMMARY

[0005] The present application is aimed at the above-mentioned problems existing in the prior art, and provides a cargo transfer device of a carriage. The present application solves the problem that the prior art cannot separately unload a specified cargo in the carriage, resulting in a troublesome and poor flexibility unloading process.

[0006] The purpose of the present application can be achieved by the following technical solutions: a cargo transfer device of a carriage, comprising a plurality of transfer units arranged on the floor of the carriage, characterized in that the plurality of transfer units are arranged adjacent to each other in the front-rear direction of the carriage, each transfer unit comprises a transverse transfer member and two support platforms arranged adjacent to each other in the left-right direction of the carriage, each support platform is respectively provided with a longitudinal transfer member, and the longitudinal transfer members on each support platform can independently operate to drive the cargo to move forward or backward, and the transverse transfer members on each transfer unit can independently operate to drive the cargo to move left or right.

[0007] When the cargo is transported in the carriage and needs to be unloaded, since the plurality of transfer units are arranged adjacent to each other in the front-rear direction of the carriage, and each transfer unit comprises a transverse transfer member and two support platforms arranged adjacent to each other in the left-right direction of the carriage, the transverse transfer member can independently operate, so that the staff can control a certain cargo to move left or right between the two support platforms, and other cargos can remain unchanged during the process. Similarly, since the longitudinal transfer members on each support platform can independently operate to drive the cargo to move forward or backward, the operator can also control a certain cargo to move forward or backward in the carriage, and other cargos can remain unchanged during the process. Through such design, if it is necessary to move the cargo near the front of the carriage out, only the cargo near the rear of the carriage needs to be moved first, and by regularly moving the cargo forward and backward in the carriage, the cargo near the front of the carriage can be turned out, realizing the unloading of the cargo. Obviously, the cargo transfer device can individually unload any specified cargo in the carriage, greatly improving the flexibility and convenience of cargo unloading.

[0008] As a preferred embodiment, the cargo is a pallet cargo, so that the size of the support platform can be reasonably set according to the size of the standard pallet, so that the size of the support platform is comparable to the size of the pallet, and one pallet cargo is placed on each support platform.

[0009] In the above-mentioned carriage goods transfer device, each support platform is respectively provided with a lifting structure for driving the lifting of the longitudinal transfer member on the corresponding support platform, and the upper surface of the longitudinal transfer member is higher than the upper surface of the transverse transfer member after the lifting of the longitudinal transfer member, and the upper surface of the longitudinal transfer member is lower than the upper surface of the transverse transfer member after the lowering of the longitudinal transfer member. When the longitudinal transfer member is lifted, the upper surface of the longitudinal transfer member is higher than the upper surface of the transverse transfer member, so that the goods are in contact with the longitudinal transfer member and are supported by the longitudinal transfer member, and at this time, the operation of the longitudinal transfer member can drive the goods to move forward or backward. When the longitudinal transfer member is lowered, the upper surface of the longitudinal transfer member is lower than the upper surface of the transverse transfer member, so that the goods are in contact with the transverse transfer member and are not in contact with the longitudinal transfer member, and at this time, the operation of the transverse transfer member can drive the goods to move left or right. Through such a design, when the goods move, they are only in contact with one of the longitudinal transfer member or the transverse transfer member, so that the goods move more smoothly.

[0010] In the above-mentioned carriage goods transfer device, the transverse transfer member is a chain or a belt arranged along the width direction of the carriage, and the longitudinal transfer member is a roller arranged on the support platform, the roller is horizontally arranged and the axis is arranged along the width direction of the carriage, each support platform is respectively provided with a driving source one capable of driving the rotation of each roller on the corresponding support platform, and each transfer unit includes a driving source two capable of driving the rotation of the chain or the belt on the corresponding transfer unit. The horizontally arranged roller with the axis arranged along the width direction of the carriage makes the roller capable of carrying the goods to move forward or backward after the lifting of the roller, and the movement is stable. Each support platform is provided with a driving source one, and each transfer unit is provided with a driving source two, which realizes the independent rotation of the roller on each support platform and the independent operation of the chain or the belt on each transfer unit, and further realizes the regular forward and backward movement of the goods in the carriage, so that the goods at any position in the carriage can be turned out.

[0011] In the above-mentioned cargo transfer device of the vehicle compartment, the transfer unit comprises a bottom plate, and two support platforms of the transfer unit are symmetrically arranged on the bottom plate, each support platform comprises at least two guide seats arranged in the front-rear direction of the vehicle compartment, a roller frame is arranged in the guide seat, and a plurality of rollers are sequentially arranged on the roller frame in the front-rear direction of the vehicle compartment. By arranging the bottom plate, the two support platforms and some accessory parts are arranged on the bottom plate, so that the transfer unit has high integration, is convenient to carry and splice on the floor of the vehicle compartment, and the installation of the transfer device in the vehicle compartment is facilitated. Each support platform has at least two guide seats arranged in the front-rear direction of the vehicle compartment, and the rollers are arranged in the guide seats through the roller frame. Such an arrangement forms a plurality of parallel rows of rollers on the support platform, and the cargo transfer process is supported by the plurality of rollers, so that the stability of the cargo transfer is improved. At the same time, the length of the rollers is short, the mass of the support platform is reduced, and the weight of the cargo transfer device is not too large, so that the practicability of the cargo transfer device is improved.

[0012] In the above-mentioned cargo transfer device of the vehicle compartment, the lifting structure is a long strip-shaped air bag arranged in the guide seat and below the roller frame, and the air bag can drive the roller frame to rise when inflated, and the roller frame can also move downward when the air bag is deflated. The long strip-shaped air bag has a large contact area with the roller frame, small loss to the roller frame, and low structural strength requirement. At the same time, the air bag has the advantage of light weight, which can reduce the weight of the transfer device.

[0013] In the above-mentioned cargo transfer device of the vehicle compartment, the lifting structure is a cylinder, and the piston rod of the cylinder is vertically arranged and connected with the roller frame at the upper end.

[0014] In the above-mentioned cargo transfer device of the vehicle compartment, each two adjacent rollers on the same roller frame are connected by a synchronous belt, each support platform is provided with a transmission shaft arranged in the width direction of the vehicle compartment, and each roller frame has a roller sleeve arranged on the transmission shaft, and a driving source is arranged beside the transmission shaft and can drive the transmission shaft to rotate. The driving source drives the transmission shaft to rotate, and the transmission shaft transmits power to the rollers on different roller frames, so that each roller on the support platform can actively rotate instead of passively rotating with the movement of the cargo, which can make the cargo move stably and smoothly on the support platform.

[0015] In the above-mentioned goods transfer device of the carriage, two strip-shaped chain bases arranged along the width direction of the carriage are arranged on the bottom plate, and two chain bases are respectively arranged at the front side and the rear side of the bottom plate. Each chain base is symmetrically arranged with a chain group on the left and right sides. Each chain group includes a driving sprocket, a driven sprocket, and two or more chains arranged side by side. The two ends of the chain are wound around the driving sprocket and the driven sprocket, respectively. The two chain bases are respectively arranged at the front side and the rear side of the bottom plate, so that the front and rear parts of the goods are supported by the chains, thereby improving the stability of the goods during placement and left-right movement. Each chain group includes two or more chains arranged side by side, which can increase the contact area between the chain group and the goods, so that the goods can be stably placed on the chain, and the stress of each chain is shared, which can protect the chain and prolong the service life of the device.

[0016] In the above-mentioned goods transfer device of the carriage, the transfer unit further includes a linkage shaft arranged along the front-rear direction of the carriage. One end of the linkage shaft is connected to the driving sprocket of one of the chain bases of the corresponding transfer unit, and the other end of the linkage shaft is connected to the driving sprocket of the other chain base of the corresponding transfer unit. The driving sprockets on the same chain base are connected by a synchronous belt II. The driving source II is arranged on the bottom plate and connected to one of the driving sprockets and can drive the driving sprocket to rotate. When the driving source II drives the linkage shaft to rotate, the driving sprockets at both ends of the linkage shaft rotate. At this time, through the action of the synchronous belt II, each chain on the same transfer unit rotates synchronously, thereby stably driving the goods to move left or right.

[0017] In the above-mentioned goods transfer device of the carriage, a top sealing plate is further fixed between the two adjacent roller frames to close the space between the two roller frames. The upper surface of the top sealing plate is lower than the upper surface of the horizontal transfer member, and the driving source I and the driving source II are located below the top sealing plate. The driving source I and the driving source II are motors. The arrangement of the top sealing plate makes the inside of the carriage flat, and the driving source I and the driving source II are hidden below the top sealing plate, thereby facilitating the entry and exit of people and goods and improving safety. The upper surface of the top sealing plate is lower than the upper surface of the horizontal transfer member, so that the bottom of the goods does not contact the top sealing plate during the movement of the horizontal transfer member, thereby improving the smoothness of the goods transfer.

[0018] Compared with the prior art, the goods transfer device of the carriage has the following advantages:

[0019] 1. The device can unload any specified goods in the carriage by regularly moving the goods forward and backward and left and right, greatly improving the flexibility and efficiency of goods unloading.

[0020] 2、The device can realize semi-automatic and intelligent operation when loading and unloading goods, thus having the advantages of safety and labor saving, and being suitable for modern logistics operation.

[0021] 3、In the device, the single transfer unit is light in weight, and the self-weight of the whole transfer device does not occupy too much total mass of the vehicle, thus having the advantages of lightness and practicability. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective structural schematic view of the goods transfer device.

[0023] Figure 2 is a top view of the goods transfer device.

[0024] Figure 3 is a perspective structural schematic view of one of the transfer units.

[0025] Figure 4 is a schematic view of the transfer unit after the top sealing plate is hidden.

[0026] Figure 5 is Figure 4 is an enlarged view of position A in FIG.

[0027] Figure 6 is a structural schematic view of the driving source driving the lateral transfer member.

[0028] Figure 7 is a structural schematic view of the driving source driving the longitudinal transfer member.

[0029] Figure 8 is an exploded view of the parts in the guide seat.

[0030] Figure 9 is a sectional view of the guide seat.

[0031] Figure 10 is a schematic view of the use state of the goods transfer device.

[0032] Figure 11 is a schematic view of the working principle of the goods transfer device.

[0033] In the figure, 1 is a transfer unit; 2 is a lateral transfer member; 3 is a support platform; 4 is a longitudinal transfer member; 5 is a driving source one; 6 is a driving source two; 7 is a bottom plate; 8 is a guide seat; 9 is a roller frame; 10 is an air bag; 11 is a synchronous belt one; 12 is a transmission shaft; 13 is a chain base; 14 is a chain set; 141 is a driving sprocket; 142 is a driven sprocket; 143 is a chain; 15 is a linkage shaft; 16 is a synchronous belt two; 17 is a top sealing plate; and 18 is a tail plate. DETAILED DESCRIPTION

[0034] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0035] Embodiment one

[0036] As shown in Figure 1 and Figure 2 , the goods transfer device of the vehicle compartment includes four transfer units 1 arranged on the floor of the vehicle compartment, and the four transfer units 1 are arranged adjacent to each other in the front-rear direction of the vehicle compartment. In actual manufacturing, the number of transfer units 1 can be increased or decreased, such as three, five, six, etc., according to the length of the vehicle compartment. Each transfer unit 1 includes a transverse transfer member 2 and two support platforms 3 arranged adjacent to each other in the left-right direction of the vehicle compartment, and each support platform 3 is respectively provided with a longitudinal transfer member 4 for supporting goods. The longitudinal transfer member 4 on each support platform 3 can independently operate to drive the goods to move forward or backward, and the transverse transfer member 2 on each transfer unit 1 can independently operate to drive the goods to move left or right.

[0037] Specifically, as shown in Figure 3 and Figure 4 , the transfer unit 1 includes a bottom plate 7, and the two support platforms 3 of the transfer unit 1 are symmetrically arranged on the bottom plate 7. In combination with Figure 5 , the transverse transfer member 2 is a chain 143 arranged in the width direction of the vehicle compartment, and the longitudinal transfer member 4 is a roller arranged on the support platform 3. The roller is horizontally arranged and the axis line is arranged in the width direction of the vehicle compartment. Each support platform 3 is respectively provided with a driving source one 5 capable of driving each roller on the corresponding support platform 3 to rotate, and each transfer unit 1 includes a driving source two 6 capable of driving the transverse transfer member 2 on the corresponding transfer unit 1 to rotate. Each support platform 3 includes three guide seats 8 arranged in the front-rear direction of the vehicle compartment, and the guide seat 8 is provided with a roller frame 9, and the roller frame 9 is provided with a plurality of rollers arranged in the front-rear direction of the vehicle compartment. Of course, in actual manufacturing, two, four or five guide seats 8 can also be arranged on each support platform 3.

[0038] As shown in Figure 3 and Figure 4 , the space between the two adjacent roller frames 9 is also fixedly connected with a top sealing plate 17 for sealing the space between the two roller frames 9. The upper surface of the top sealing plate 17 is lower than the upper surface of the transverse transfer member 2, and the driving source one 5 and the driving source two 6 are located below the top sealing plate 17. The driving source one 5 and the driving source two 6 are both electric motors. The arrangement of the top sealing plate 17 makes the inside of the vehicle compartment flat, and the driving source one 5 and the driving source two 6 are both hidden below the top sealing plate 17, thereby facilitating the entry and exit of people and goods, and improving safety.

[0039] As shown in Figure 4 , Figure 5 andFigure 6 As shown, the bottom plate 7 is provided with two strip-shaped chain bases 13 arranged along the width direction of the carriage, and the two chain bases 13 are respectively located at the front side and the rear side of the bottom plate 7. Each chain base 13 is provided with a chain set 14 symmetrically arranged left and right. Each chain set 14 includes a driving sprocket 141, a driven sprocket 142, and two chains 143 arranged side by side. The two ends of the chain 143 are wound around the driving sprocket 141 and the driven sprocket 142 respectively. The transfer unit 1 further includes a linkage shaft 15 arranged along the front-rear direction of the carriage. One end of the linkage shaft 15 is connected with the driving sprocket 141 on one of the chain bases 13 of the corresponding transfer unit 1, and the other end of the linkage shaft 15 is connected with the driving sprocket 141 on the other chain base 13 of the corresponding transfer unit 1. The driving sprockets 141 on the same chain base 13 are connected through a synchronous belt 16. The driving source 6 is arranged on the bottom plate 7, and the driving source 6 is connected with one of the driving sprockets 141 and can drive the driving sprocket 141 to rotate. When the driving source 6 drives the linkage shaft 15 to rotate, the linkage shaft 15 drives the driving sprockets 141 at both ends to rotate. At this time, through the action of the synchronous belt 16, each chain 143 on the same transfer unit 1 is driven to rotate synchronously, thereby stably driving the goods to move left or right.

[0040] As shown in Figure 7 Each adjacent two rollers on the same roller frame 9 are connected through a synchronous belt 11. Each support platform 3 is provided with a transmission shaft 12 arranged along the width direction of the carriage. Each roller frame 9 has a roller sleeve arranged on the transmission shaft 12. The driving source 1 is arranged beside the transmission shaft 12 and can drive the transmission shaft 12 to rotate. The driving source 1 drives the transmission shaft 12 to rotate, and the transmission shaft 12 transmits power to the rollers on different roller frames 9, so that each roller on the support platform 3 can rotate actively.

[0041] As shown in Figure 8 and Figure 9 Each support platform 3 is provided with a lifting structure for driving the longitudinal transfer member 4 to lift. When the longitudinal transfer member 4 is lowered, the upper surface thereof is lower than the upper surface of the horizontal transfer member 2. When the longitudinal transfer member 4 is raised, the upper surface thereof is higher than the upper surface of the horizontal transfer member 2. Specifically, the lifting structure is an air bag 10 arranged in the guide seat 8 and located below the roller frame 9. When the air bag 10 is inflated, the roller frame 9 can be lifted. When the air bag 10 is deflated, the roller frame 9 can be moved downward.

[0042] When the longitudinal conveyor 4 is lifted, the goods come into contact with and are supported by it. At this time, the operation of the longitudinal conveyor 4 can move the goods forward or backward. When the longitudinal conveyor 4 is lowered, its upper surface is lower than the upper surface of the transverse conveyor 2. Therefore, the goods come into contact with the transverse conveyor 2 but not with the longitudinal conveyor 4. At this time, the operation of the transverse conveyor 2 can move the goods left or right. This design ensures that the goods only come into contact with one of the longitudinal conveyor 4 or the transverse conveyor 2 during movement, making the movement smoother.

[0043] like Figure 10 As shown, palletized goods are preferred, so that the size of the support platform 3 can be reasonably set according to the size of the standard pallet, so that the size of the support platform 3 is comparable to the size of the pallet, and one palletized goods are placed on each support platform 3.

[0044] The following text combines Figure 10 and Figure 11 Briefly describe the working principle of this transfer device:

[0045] In this transfer device, several transfer units 1 are arranged adjacent to each other along the front-to-back direction of the carriage. Each transfer unit 1 includes a transverse transfer component 2 and two support platforms 3 arranged adjacent to each other along the left-to-right direction of the carriage. The transverse transfer component 2 can operate independently, allowing the operator to control a specific item to move left or right between the two support platforms 3, while other items remain stationary. Similarly, since the longitudinal transfer component 4 on each support platform 3 can operate independently to move items forward or backward, the operator can also control a specific item to move forward or backward within the carriage, while other items remain stationary.

[0046] Normally, cargo boxes have a tailgate 18, and goods are transported inside the cargo box. However, if it is necessary to... Figure 11 When unloading cargo No. 5 separately, cargo No. 8 can be moved backward first, so that it is on the tail panel 18. Then, cargo No. 7 can be moved to the right, at which point cargo No. 5 can be moved backward onto the tail panel 18, thus completing the loading and unloading of cargo No. 5. Similarly, any other cargo can be unloaded by moving it systematically back and forth and left and right within the carriage. In practice, the systematic movement of cargo within the carriage is controlled by the onboard control system, making this cargo transfer device easy to operate and highly practical.

[0047] Of course, in actual circumstances, such as Figure 10As shown, only seven pallets are usually placed on the eight support platforms 3 for transportation, which can save the process of moving the goods to the tailgate 18 and also can realize the random guiding of pallets for the trucks without tailgate 18.

[0048] Embodiment Two

[0049] The embodiment is basically the same as the structure and principle of Embodiment One, except that the lateral moving unit 2 is a belt arranged along the width direction of the carriage, and the driving mode of the belt is the same as the driving mode of the chain 143 in Embodiment One, which will not be described again here.

[0050] Embodiment Three

[0051] The embodiment is basically the same as the structure and principle of Embodiment One, except that the lifting structure is a cylinder, which is fixed on the floor of the carriage, and the piston rod of the cylinder is arranged vertically and the upper end of the piston rod is connected with the roller frame 9.

[0052] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0053] Although the terms such as 1, moving unit; 2, lateral moving unit; 3, support platform; 4, longitudinal moving unit; 5, driving source one; 6, driving source two; 7, bottom plate; 8, guide seat; 9, roller frame; 10, air bag; 11, synchronous belt one; 12, transmission shaft; 13, chain base; 14, chain set; 141, driving sprocket; 142, driven sprocket; 143, chain; 15, linkage shaft; 16, synchronous belt two; 17, top cover; 18, tailgate, etc. are used more frequently in this paper, but the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the present application; any interpretation of them as any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. A cargo transfer device for a carriage, comprising a plurality of transfer units (1) disposed on the carriage floor, characterized in that, Several transfer units (1) are arranged adjacent to each other along the front and rear direction of the carriage. Each transfer unit (1) includes a transverse transfer component (2) and two support platforms (3) arranged adjacent to each other along the left and right direction of the carriage. Each support platform (3) is provided with a longitudinal transfer component (4). Each longitudinal transfer component (4) on each support platform (3) can operate independently to move the goods forward or backward. Each transverse transfer component (2) on each transfer unit (1) can operate independently to move the goods to the left or right. The transverse transfer component (2) is a chain (143) arranged along the width direction of the carriage. The transfer unit (1) includes a base plate (7) and a linkage shaft (15) arranged along the front and rear direction of the carriage. The base plate (7) is provided with two strip-shaped chain bases (13) arranged along the width direction of the carriage. Each chain base (13) is provided with two chain groups (14) arranged symmetrically on the left and right. Each chain group (14) includes a drive chain. A wheel (141), a driven sprocket (142), and a chain (143) are wound around the driving sprocket (141) and the driven sprocket (142). One end of the linkage shaft (15) is connected to the driving sprocket (141) on one of the chain bases (13) of the corresponding transfer unit (1), and the other end of the linkage shaft (15) is connected to the driving sprocket (141) on another chain base (13) of the corresponding transfer unit (1). The driving sprockets (141) on the same chain base (13) are connected to each other by a synchronous belt (16). Each transfer unit (1) includes a second drive source (6) that can drive the chain (143) on the corresponding transfer unit (1) to rotate. The second drive source (6) is set on the base plate (7). The second drive source (6) is connected to one of the driving sprockets (141) and can drive the driving sprocket (141) to rotate.

2. The cargo transfer device for a carriage according to claim 1, characterized in that, Each support platform (3) is provided with a lifting structure for driving the longitudinal transfer member (4) on the corresponding support platform (3) to rise and fall. After the longitudinal transfer member (4) rises, its upper surface is higher than the upper surface of the transverse transfer member (2). After the longitudinal transfer member (4) falls, its upper surface is lower than the upper surface of the transverse transfer member (2).

3. The cargo transfer device for a carriage according to claim 2, characterized in that, The longitudinal transfer component (4) is a roller set on the support platform (3). The roller is set horizontally and its axis is set along the width direction of the carriage. Each support platform (3) is provided with a drive source (5) that can drive each roller on the corresponding support platform (3) to rotate.

4. The cargo transfer device for a carriage according to claim 3, characterized in that, The two support platforms (3) of the transfer unit (1) are symmetrically arranged on the base plate (7). Each support platform (3) includes at least two guide seats (8) arranged along the front and rear direction of the carriage. The guide seats (8) are provided with roller frames (9), and the roller frames (9) are provided with a number of rollers arranged sequentially along the front and rear direction of the carriage.

5. The cargo transfer device for a carriage according to claim 4, characterized in that, The lifting structure is a long strip-shaped airbag (10) set inside the guide seat (8) and located below the roller frame (9). When the airbag (10) is inflated, it can drive the roller frame (9) to rise, and when the airbag (10) is deflated, the roller frame (9) can also move downward.

6. The cargo transfer device for a carriage according to claim 4, characterized in that, The lifting structure is a cylinder, and the piston rod of the cylinder is vertically arranged and the upper end of the piston rod is connected to the roller frame (9).

7. The cargo transfer device for a carriage according to claim 4 or 5, characterized in that, Each pair of adjacent rollers on the same roller frame (9) is connected by a synchronous belt (11). Each support platform (3) is provided with a drive shaft (12) arranged along the width of the carriage. Each roller frame (9) has a roller sleeved on the drive shaft (12). The drive source (5) is located on the side of the drive shaft (12) and can drive the drive shaft (12) to rotate.

8. The cargo transfer device for a carriage according to claim 4 or 5, characterized in that, Two chain bases (13) are located on the front and rear sides of the base plate (7), respectively. Each chain group (14) includes a drive sprocket (141), a driven sprocket (142), and two or more of the above-mentioned chains (143) arranged side by side.

9. The cargo transfer device for a carriage according to claim 4 or 5, characterized in that, A top sealing plate (17) is fixedly connected between two adjacent roller frames (9) to close the space between the two roller frames (9). The upper surface of the top sealing plate (17) is lower than the upper surface of the transverse transfer member (2). The first drive source (5) and the second drive source (6) are both located below the top sealing plate (17).

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