KR0137004B1 - Conveying system - Google Patents

Abstract

Point positioning and delivery systems include multiple groups of long conveyors, each group containing at least two conveyor slats. The conveyor drive mechanism includes a first drive unit connected to one end of the conveyor slat and a second drive unit connected to the other end of the conveyor slat. Each drive unit is made and arranged such that the conveyor slats in one predetermined direction selectively move longitudinally independently at the same time.

Description

Cargo carrier

FIG. 1 is a schematic diagram of the first embodiment showing the state of a control valve for moving all the slats in the conveyor to the left to coincide.

FIG. 2 shows an embodiment in FIG. 1 with the control valve moving all the slats to the right one at a time.

FIG. 3 shows an embodiment of FIG. 1 showing the state of a control valve for moving all the slats to the right to coincide. FIG.

4 shows a first embodiment of the present invention in a state in which all slats are moved left one at a time;

5 is a view of a second embodiment of the present invention in which some of the slats are fixed.

6 is a side elevation of the embodiment of FIGS. 1-4.

7 is a plan view showing a portion of the embodiment of FIGS. 1-4 and 6 along line 7-7 of FIG.

8 is a side elevational view of a third embodiment of the present invention.

9, 10 and 11 are side elevation views of fourth, fifth and sixth embodiments of the invention.

* Description of the symbols for the main parts of the drawings *

10: Cargo transportation device 12,14: Group

16 Conveyor Drive Device 18 First Drive Unit

20: second drive unit

22,24,26,28,30,32,34,36,38,40,42,44: Drive

46,48: Block 50: Pressure source

52: feedback device 54: control device

56 drive control circuit 60: direction switching valve

62: switching valve 64, 66: system control cylinder

70: conveyor frame 72: fixed floor

78,80: drive unit mounting portion 84: side frame

86: notch 90,92,94,96: conduit

98,100: restraint

The present invention relates to a freight transport device, in particular a freight transport device known as a movable floor.

Mobile floors are used in various cargo handling environments such as warehouses and trailers used in trucking transportation. The basic concept of a movable floor or reciprocating conveyor is disclosed in the Applicant's U.S. Patent No. 4,143,760, which describes a mobile floor having elongated slats forming a plurality of groups. have. In this arrangement, the hydraulic drive moves forward all the slats of each group simultaneously from the starting position to the cargo transport direction, and in the opposite direction from the position to be moved forward to the starting position. Move all slats in each group in succession. The cargo is carried in the direction determined by the method.

Known reciprocating conveyor devices generally use rigid slats formed of extruded aluminum. Hydraulic drives typically have a number of hydraulic cylinder types, each of which is mounted in a transverse drive beam or transverse drive with respective slats forming a group. Another form of drive includes a reciprocating rod extending between a single cylinder or a pair of fixed cylinders mounted to reciprocate on a fixed axis. In the device a reciprocating rod or a reciprocating cylinder is mounted on the transverse drive and the slats forming each group are mounted on one of the transverse drive.

The slat conveyor system has been very successful in providing a trailer unit unloading capacity at a reasonable cost while occupying little space in the trailer. However, because the slats extend over the entire length of the trailer and must cover the entire trailer floor, the weight of the conveyor unit is substantial even when lightweight materials such as aluminum are used. In addition, the cargo carried often falls onto the slats inside the trailer, so the slats are often damaged, leaving the device inoperable. Also, considering the amount of aluminum that must be used, the debt of the slats accounts for a significant portion of the cost of the conveyor equipment.

Finally, a seal must be constructed between the slats so that the conveyor device has a watertight function. The seals need to be replaced from time to time to increase maintenance work on the device.

It is an object of the present invention to overcome the limitations indicated in the prior art. For another purpose, (1) a trailer-mounted reciprocating conveyor unit that does not require the use of expensive slats mounted between seals, (2) a self-watering reciprocating conveyor unit and (3) a slat. Instead, a conveyor device similar to the slat conveyors of the prior art and (4) slats are simply pulled rather than pushed, except that flexible bands are used which are less damaged during cargo handling operations. A reciprocating floor conveyor device that is operated to reduce the structural requirements of the slats, (5) a trailer-mounted conveyor device that is lighter and takes up less space than conventional slat conveyor devices, and (6) multiple inside or under trailers. In order to develop a conveyor device that can be used in a number of different applications, with driving components in place. .

The freight transport device is composed of a plurality of groups including two or more elongated slats, and a conveyor drive device including a first drive unit connected to one end of the slat and a second drive unit connected to the other end of the slat, Each of the first drive unit and the second drive unit is configured and arranged to selectively, independently and simultaneously drive the slats in one direction determined by the tensile force applied to the slats. In one embodiment, the slats are flexible and the drive unit is moved by applying tension to the slats. The drive units can be placed in various positions, and a number of different embodiments are disclosed next.

Referring to the drawings, firstly, the freight transport apparatus 10 is schematically shown in FIG. The freight transport apparatus 10 includes a conveyor forming a plurality of groups 12 and 14. Each group of conveyors includes at least two conveyor slats. In the illustrated embodiment, three conveyor slats 12a, 12b, 12c are shown. A similar set of conveyor slats 14a, 14b, 14c are associated with the group 14.

It is an object of the present invention to have a conveyor slat which is flexible or rigid and is made of plastic or steel and can be provided in any length. To this end, the conveyor slats are moved by a pulling action at each end of the conveyor slats. For this purpose, a conveyor drive mechanism 16 is provided to move the conveyor slats consistently or independently along the longitudinal axis 14a 'of the conveyor slats 14a.

The conveyor drive device 16 includes a first drive unit 18 and a second drive unit 20. Each drive unit includes a drive device associated with each conveyor slat. For example, the first drive unit 18 includes drive units 22, 24, 26, 28, 30, 32, and the second drive unit 20 includes drive units 34, 36, 38, 40, 42. , 44). Referring to the drive device 24 as an example for each drive device, the hydraulic cylinder 24a, the piston 24b moving in the hydraulic cylinder 24a, and between the piston 24b and the slat 14b. An extended piston rod 24c.

The drive device 24 includes a first port 24d, a second port 24e and a third port 24f. A check ball 24g is associated with the first port 24d of the drive device 24. The spring 24h loads the check ball 24g toward the seat of the check ball 24g facing the first port 24d. The remaining drives have corresponding features except that the drives 22, 28, 38, 44 do not have a third port check ball or springs associated with the check ball.

For drives connected to a special group of conveyor slats, the second port constituting one drive is connected to the first port of the adjacent drive, and there is only one-way flow in the check ball and the spring. . The second port is connected to the third port of the adjacent drive by conduit 24i.

In the embodiment shown, the drive has the form of a hydraulic cylinder formed in machined blocks 46 and 48. The hydraulic cylinder is a unit structure connected according to the prior art by a hose. The hydraulic cylinder is powered by a hydraulic fluid pressure source 50.

The feedback device 52 is provided to return hydraulic oil to the pressure source 50. The arrangement of hydraulic components is called a one-way annulus system in which the piston acts as a spooling device.

Each conveyor slat is connected with a drive in the first drive unit 18 and a drive in the second drive unit 20. The conveyor slats move along the longitudinal axis by the pulling force applied to the ends of the conveyor slats.

A control mechanism 54 controls the operation of the drive and the movement of the conveyor slats. The control device 54 includes a plurality of valves for directional control, hydraulic supply and hydraulic return of the fluid through the connection with the drive. The control device 54 includes a drive device control circuit 56 and a system control circuit 58. Although two control circuits are shown having separate pressure sources and feedback devices, one pressure source and feedback device can be used in the drive control circuit and the system control circuit.

The drive control circuit 56 is manually operated and includes a direction switching valve 60 for controlling the direction in which cargo moves along the longitudinal direction of the conveyor slat. The directional valve 60 is manually operated to select the cargo moving direction.

The switching valve 62 supplies hydraulic oil to the first drive unit 18 or the second drive unit 20 to determine whether the conveyor slats are to be matched or sequentially moved. The switching valve 62 is driven by system control cylinders 64 and 66 controlled by the system valve 68. System valve 68 is moved between two positions under the action of pistons 34b and 38b. As a modification of the above configuration, it may include a system valve shifting mechanism configured in the piston rod or the conveyor slat.

Referring to FIG. 6 and FIG. 7, the conveyor slat 14b and the upper floors 74 and 76 and the drive unit firewood, which move on the fixed floor 72 and the fixed floor 72. Consists of a conveyor frame (70) comprising a (78, 80). The fixed floor 72 is supported by a cross piece 82 placed on the side frame 84.

Referring to FIG. 7, a conveyor slat is arranged below the upper floor 76 and above the fixed floor 72. A notch 86 is configured in the fixed floor 72 so that the connecting portion 58 formed between the piston rod 36c and the conveyor slat 14b is insertable. Conveyor slats are flat structures and may be made of plastic or metal and may be flexible or rigid, placed on slightly irregular or undulating paths.

The operation of the preferred embodiment is described with reference to FIG. When the diverter valve 60 is in the left position with respect to the conduits connected, the hydraulic oil is directed to the drive unit so that all conveyor slats in the cargo transport device 10 are sequentially moved to the left. Hydraulic oil will be supplied from the hydraulic source 50 to all drives of the first drive unit 18 to pull all conveyor slats to the left. As is apparent from the flow path of the hydraulic oil, pressure is applied to the first port 22d of the driving device 22 and pressure is applied to the first port 28d of the driving device 28 at the same time. Pressure is supplied through pressure tubes such as conduits 90 and 92 for supplying and returning hydraulic oil to the first drive unit 18 and conduits 94 and 96 that perform the same function for the second drive unit 20. . As shown, conduit 90 is connected to the first port of the drive and conduit 92 is connected to the second port of the drive.

As hydraulic pressure is applied to the conduits 90 and 92, the pistons 22b and 28b first move and the pistons 22b and 28b are restraints located at the right ends of the conveyor slats 12a, 12b, 14a and 14b. If (98) is missing, move to the end of the piston stroke.

The constrainer 98 on the right blocks the independent movement of a particular conveyor slat until another conveyor slat is ready to move.

By the constrainer 100 on the left, the conveyor slats in each group move together with the conveyor slats in the other group. In this embodiment, all of the conveying slats move after one of the conveyor slats moves and all the encoding means are movable by the hydraulic pressure acting on the piston of the drive in the first drive unit.

Pressure is applied to all the pistons in the first drive unit 18. As the pressure increases, check balls are pressed against the respective springs so as to have an equal pressure across the first drive unit 18.

As the conveyor slats are pulled to the left by the drives in the first drive unit 18, the pistons of the drives in the second drain region 20 pull the conveyor slats, resulting in the hydraulic oil flowing out of the cylinder and then returning. Return to the device 52. When the slat tension valve 102 is in the open position as shown in FIG. 1, the hydraulic oil is returned from the second drive unit 20 to the feedback device.

When pressure is applied to the drive in the first drive unit 18, all conveyor slats in the groups 12, 14 coincide to the left. Therefore, all cargo carried on the conveyor slats moves with the conveyor slats to the left.

System valve 68 is connected to drives 34 and 38 to alternately move leftward or rightward relative to the position of the conduits. When the piston 38b is fully retracted into the hydraulic cylinder, the system valve 68 moves to the left as shown in FIG. 2 so that the system control cylinders 64 and 68 move the switching valve 62 to the position of the conduits. To the right, resulting in the conduits 94 and 96 and the conduits 90 and 92 being connected to the return device 52.

When applying pressure to the drive in the second drive unit 20, the conveyor slats located in each group are moved to the right one at a time. Along the fluid passage in conduit 94, hydraulic oil pressurized from pressure source 50 travels into conduit 94 through switching valve 62. Initially, hydraulic oil enters the drives 34 and 40 through the respective first ports 34d and 40d. The hydraulic fluid flow causes the piston to move to the left (right in FIG. 2). Before the check balls 34g and 40g interfere with the flow of hydraulic oil through the second port and the fluid reaches the adjacent drive through the conduits 34i and 40i, the piston must move the maximum stroke. Once the piston has completed its maximum stroke, fluid flows through conduits 34i and 40i to adjacent cylinders, and the movement of the connected conveyor slats begins.

At any moment, when only one conveyor slat among the three conveyor slats forming a group moves, the cargo load on the three conveyor slats forming the group is approximately 2 of the cargo loads supported by the stationary conveyor slats. / 3, whereas only one third of the cargo load is supported by the moving conveyor slats, so that the cargo remains stationary on the stationary conveyor slats, so that one conveyor slab that moves individually can do. The process is repeated until all conveyor slats have moved to the rightmost end of the conveyor slats. As the piston 34b reaches its maximum expansion, the system valve 68 moves to the crossflow valve position, which in turn moves the system control cylinders 64, 68 and the switching valve 62 in FIG. All conveyor slats coincide and are moved to the left.

The cycle is repeated as necessary to move the cargo completely to the left of the figure. The movement is used to load the cargo to the trailer including the device when the open end of the trailer is on the right side of the drawing or to unload the trailer with the device when the open end of the trailer is to the left of the device. . The device can be used stationary.

As mentioned above, in some cases conveyor slats are made of a flexible material. Before the cargo transportation device is deactivated, the embodiment tension valve 102 is moved to the closed position, and the tension is applied to both ends of the conveyor slat simultaneously by simultaneously applying pressure to the first drive unit 18 and the second drive unit 20. Will give. The conveyor slat compresses the fixed floor 72 by the tension applied to the conveyor slat. The slat tension valve 102 must be opened before any other operation of the device can take place.

Referring to FIG. 3, the divert valve 60 is moved to the right position with respect to the connected conduit, moving all the conveyor slats to the right consistently. First, the pressure source 50 supplies hydraulic oil to the second drive unit 20 through conduits 94 and 96 that simultaneously apply hydraulic pressure to the driving devices 34, 38, 40 and 44, and the constrainer 98 on the right side 98 And the conveyor 100 on the left side move all conveyor slats after they are pulled by their respective drives. The conduit structure shown drives the drives 38 and 44 to move the conveyor slats connected by hydraulic pressure. Restrictions 98 and 100 prevent individual slat movement, and all conveyor slats move in unison.

At the end of the stroke, the piston 34b moves the system valve 68 to move the system control cylinders 64 and 66 and the switching valve 62 to form the valve shown in FIG. 4, with the first drive The drives in the unit 18 are pressurized one at a time, moving all conveyor slats left one at a time, starting with the drives 26 and 32. The operation of the device is shown in FIGS. 3 and 4 and moves the cargo to the right.

5 is a modified cargo transport apparatus 110 is shown. The modified cargo carrier has a first group of conveyor slats 112 and a second group of conveyor slats having moving conveyor slats 112c, 112b, 114a, 114b on both sides of the fixed conveyor slats 112c, 114c. 114. A conveyor drive device 116 is provided that includes a first drive unit 118 and a second drive unit 120. Each drive unit includes a plurality of drives 122, 124, 126, 128, 130, 132, 134 and 136.

In this configuration, the fixed conveyor slats 112c and 114c are not connected to the drive and remain fixed. The fixed conveyor slats 112c and 114c are only used to compare with the moving conveyor slats 112a, 112b, 114a and 114b, and the fixed conveyor slats 112a and 114c are in the same open space as the fixed floor 72. . With this arrangement, when the conveyor slats move in unison, the conveyor slats support two thirds of the cargo load, while one third of the cargo loads are supported by the fixed conveyor slats of the device. As the conveyor slats move individually, two-thirds of the cargo components are supported by fixed conveyor slats. With the cargo stopped, the conveyor slats change direction to allow sliding. Operation of the cargo transport device 110 is similar to the operation of the cargo transport device (10).

Many alternative embodiments have been presented in which the drive unit is connected to the conveyor slat. In the modified form of FIG. 8, the drive 138 is attached to one end of the conveyor slat 140 and the drive 142 is connected to the other end. The embodiment uses the fixed floor 72 and the upper floors 74 and 76, as described in the first embodiment of the present invention. However, the drives 138 and 142 are actually connected to the drive unit mounts 144 and 146 which are configured under the conveyor slats. The configuration has an arrangement that is slightly smaller than the overall size of the device, with pull-pull as viewed from the center of the conveyor slat to the end of the conveyor slat.

Referring to FIG. 9, the flexible conveyor slat 150 wraps around the pulleys 152 and 154 and is connected to the drives 156 and 158.

The flexible conveyor slat 150 is pulled at the ends by the drives 156 and 158. In this configuration, the restraint 161 is placed on the surface of the adjacent conveyor slat so as to interact with the auxiliary member on the adjacent conveyor slat. According to an alternative embodiment, the restraint body is in the form of a limit switch configured on the hydraulic cylinder and actuated by a conveyor slat, piston or piston rod.

In some cases, it is desirable to further reduce the overall length of the device. Referring to FIG. 10, the drive unit 160 operates with a flexible conveyor slat 150 mounted vertically and surrounding the pulley 152. The configuration is provided at one or both ends of the device.

According to another optional embodiment of the cargo transport device using a double acting cylinder as the drive device 162, one end of the piston rod is connected to the flexible conveyor slat 150 and the other end is flexible. It is connected to a chain (164) connected to the other end of the conveyor slat with.

The device is required to select ports by other valve mechanisms and to configure the ports in addition to the drive unit, but the conduit configuration is readily made by those skilled in the art.

Although signaled embodiments of the invention and its various modifications have been published, other modifications may be made without departing from the scope of the invention as defined in the appended claims.

Claims (14)

Conveyor slats consisting of a plurality of groups 12, 112, 14, 114 comprising two or more elongated conveyor slats 12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150 Conveyor slats 12a, 12b, 12c, 112a and first drive units 18,118 connected to one end of (12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150). Conveyor drive device (16,116) including second drive unit (20,120) connected to the other end of the (112b, 112c, 14a, 14c, 114a, 114b, 114c, 140, 150), the first drive unit (18,118) And conveyor slats 12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, wherein each of the second drive units 20, 120 forms groups 12, 112, 14, 114 in a predetermined direction. Cargo carrying device (10,110), characterized in that configured and arranged to drive one or more of the 114c, 140, 150 independently. The method of claim 1, wherein each of the first drive unit (18,118) and the second drive unit (20,120) is a conveyor slat (12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c). Drives 140, 150, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 122, 124, 126, 128, 130, 132, 134, 136, 138, 142, 156, 158, 162, conveyor slats 12a, 12b, 12c, 112a, 112b, 112c. 14a, 14b, 14c, 114a, 114b, 114c, 140, 150 selectively and continuously actuate groups 12, 112, 14, 114 so that they move along the longitudinal axis of the conveyor slat; A freight transport device characterized in that it is constructed and arranged to operate in accordance with one drive unit (18,118) and another second drive unit (20,120). 3. The driving device (22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 122, 124, 126, 128, 130, 132, 134, 136, 138, 142, 156, 158, 162) is a hydraulic cylinder (22a, 24a, 26a, 28a, 30a, 32a, 34a). , 36a, 38a, 40a, 42a, 44a, 122a, 124a, 126a, 128a, 130a, 132a, 134a, 136a, and the cargo transportation device 10, 110 includes a pressure source 50, Freight transport system. 3. The conveyor frame of claim 2 comprising a conveyor frame 70 and providing tension on the conveyor slats 12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150. In order to achieve this, the drive units 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 122, 124, 126, 128, 130, 132, 134, 136, 138, 142, 156, 158, 162 are conveyor slats 12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150 and located at the ends of the drive units 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 122, 124, 126, 128, 130, 132, 134, 136, 138, 142, 156, 158, 162. 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150, characterized in that it is mounted to the conveyor frame (70) on the outside of the conveyor slat relative to the end. 3. The conveyor slab according to claim 2, comprising a conveyor frame 70, and the driving devices 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 122, 124, 126, 128, 130, 132, 134, 136, 138, 142, 156, 158, 162 are conveyor slats 12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150 and located at the ends of the drives 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42,44,122,124,126,128,130,132,134,136,138,142,156,158,162 are conveyors slats 12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150 on the inside of the conveyor slat (70) Cargo carrying apparatus, characterized in that the mounting. The freight transport apparatus according to claim 1, wherein the conveyor slats (12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150) are flexible. The conveyor slat of claim 6, comprising a conveyor frame 70 having pulleys 152 and 154 at one end, and having flexible conveyor slats 12a, 12b, 12c, 112a, 112b, 112c around the pulleys 152 and 154. 14a, 14b, 14c, 114a, 114b, 114c, 140, 150 are wound, and the drive units 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 122, 124, 126, 128, 130, 132, 134, 136, 138, 142, 156, 158, 162 are conveyor slats. 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150 and mounted to the conveyor frame 70, the first drive unit (18,118) located at one end And a second drive unit (20,120) is mounted on the side frame (84) in the vertical direction. 2. A constrainer (98, 100, 161) is formed between two or more groups (12, 112, 14, 114) to actuate two or more groups (12, 112, 14, 114) formed of conveyor slats simultaneously in one direction. Freight transport system. 2. A control apparatus (54) for controlling the conveyor drive devices (16, 116) is constructed, and the conveyor drive (12a) is operated by simultaneously operating the first drive units (18, 118) and the second drive units (20, 120). The control device 54 includes a drive device control circuit 56 to apply tension to 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150. Freight transport system. Consists of a plurality of groups 12, 112, 14, 114, including two or more elongated conveyor slats 12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150, each conveyor Conveyor drives 16 and 116 are configured to selectively and intermittently apply tension to the ends of the slats 12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150, Elongated conveyor slats 12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150 move forward simultaneously from the starting position to the forward position in the no-load direction, and then for each group Conveyor slats (12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150) forming (12, 112, 14, 114) continuously return to the starting position Conveying device. The conveyor drives 16, 116 of the plurality of hydraulic cylinders 22a, 24a, 26a, 28a, 30a, 32a, 34a, 36a, 38a, 40a, 42a, 44a, 122a, 124a, 126a, 128a, One or more conveyor slats 12a, 12b, 12c, 112a, 112b, 112c, 14a, including 130a, 132a, 134a, 136a, each hydraulic cylinder forming a group 12, 112, 14, 114 in only one direction; Cargo transportation device characterized in that for driving 14b, 14c, 114a, 114b, 114c, 140, 150. 11. The conveyor drive device (16) of claim 10, wherein the conveyor drive (16, 116) comprises at least two first drive units (18, 118) and a second drive unit (20, 120) for the groups of conveyor slats (12, 112, 14, 114). (18,118) and the second drive unit are mounted adjacent to both ends of the conveyor slats 12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150. Freight transport system. 11. The conveyor drive device (16, 116) of claim 10 comprises a plurality of hydraulic cylinders (22a, 24a, 26a, 28a, 30a, 32a, 34a, 36a, 38a, 40a, 42a, 44a, 122a, 124a, 128a, 130a, One or more conveyor slats 12a, 12b, 12c, 112a, 112b, 112c, 14a, 14b, 14c, 114a, 114b, 114c, 140, 150, including 134a, 136a and forming groups 12, 112, 14, 114 A freight transport apparatus, characterized in that one of the hydraulic cylinders is mounted to initially drive in one direction and then in the other. 11. A constrainer (98, 100, 161) is added between the groups (12, 112, 14, 114) of the conveyor slats so that longitudinal driving of two or more groups (12, 112, 14, 114) formed of the conveyor slats simultaneously occurs in one direction. Cargo carrying device, characterized in that consisting of.