JP2009234420A - Cargo transfer device in truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To promote effective utilization of the high-stage side floor as a part of the loading platform in a truck provided with a loading platform having a floor with multiple stages having different heights. <P>SOLUTION: A transfer device includes a plurality of floor plate groups consisting of a plurality of floor boards arranged perpendicularly to the longitudinal direction and individually belonging to the group different from the groups to which the floor board adjoining in the perpendicularly crossing direction belong and a plurality of hydraulic cylinders 13A, 13B, 13C, 113A, 113B, 113C installed to the individual floor plate member groups to simultaneously reciprocate the floor plate members belonging to the individual floor plate member groups. The floor plate groups and the hydraulic cylinders are each installed on a low-stage floor 3a and a high-stage floor 3b. A controller 55 successively drives the hydraulic cylinders 13A, 13B, 13C, 113A, 113B, 113C to successively move the floor plate members of the floor plate member groups forward. Then, the controller simultaneously drives the hydraulic cylinders 13A, 13B, 13C, 113A, 113B, and 113C to move the floor plate members of the floor plate member groups backward all at once, thereby transferring cargoes. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a load conveying device in a truck.

  2. Description of the Related Art Conventionally, in a truck, a transport device that transports a load in a cargo bed by sliding a floor board material of the cargo bed appropriately back and forth is known (see Patent Document 1). The load conveying device disclosed in Patent Document 1 includes a plurality of divided floor boards. The plurality of floor board materials constitute first, second and third floor board material groups composed of a plurality of floor board materials arranged in every three in the left-right direction. The floor board material of the first floor board material group, the floor board material of the second floor board material group, and the floor board material of the third floor board material group are arranged in this order, and such an arrangement pattern is repeatedly formed in the left-right direction. Has been.

During the transportation of the load, a first operation for moving only the floor board material of the first floor board material group, a second operation for moving only the floor board material of the second floor board material group, and a third The third operation for moving only the floor board material of the floor board material group and the fourth operation for simultaneously returning all the floor board materials of the first to third floor board material groups are repeated. In the first, second, and third operations, the floor boards of some of the floor board groups (strictly, two floor board groups of the three floor board groups) are stopped. The floorboard material that slides slides against the load. Therefore, the load has stopped. On the other hand, in the fourth operation, the floor board materials of all floor board material groups move backward, so that the load proceeds together with the floor board material. That is, the load is conveyed in the backward movement direction of the floor board material as the floor board material moves backward.
JP 2001-39208 A

  By the way, like a so-called stepped trailer, a lorry having a two-stage floor with different heights behind a cab (cab) is known. In this type of truck, the floor on the front side of the vehicle is higher than the floor on the rear side of the vehicle. In conventional trucks, there is a step between the front floor and the rear floor, so the higher floor (ie, the front floor) is not used as a loading platform, and the lower floor (ie, the rear) Only the floor).

  However, if it is possible to effectively use the higher floor as part of the loading platform, it is preferable because the loading platform can be increased in capacity.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a load conveying device that promotes effective use of a high-level floor as a part of a loading platform. .

  A cargo transport device in a lorry according to the present invention includes a first stage floor, and a second stage floor that is positioned closer to a loading / unloading side than the first stage floor and is lower than the first stage. A cargo transport device in a truck equipped with a loading platform, comprising a plurality of floor boards arranged in a direction orthogonal to the longitudinal direction, and the floor boards adjacent in the orthogonal direction are classified so as to belong to different groups. A plurality of floor board material groups, and a plurality of actuators that are provided in each of the plurality of floor board material groups and reciprocate the floor board materials belonging to each floor board material group in the longitudinal direction at the same time. In each of the two-stage floors, the plurality of actuators are sequentially driven on each of the first-stage floor and the second-stage floor, thereby sequentially moving the floor board materials of the plurality of floor board material groups. The plurality of By driving the actuators at the same time, those equipped with a control device for advancing the load to backward direction of the floor plate material by backward floorboards material of the plurality of floor members groups simultaneously.

  According to the said conveying apparatus, the load of the 1st stage floor can be automatically advanced to the carrying in / out side, and it can be conveyed to the 2nd stage floor. Furthermore, the load transported to the second stage floor can be automatically advanced to the loading / unloading port, and can be discharged from the loading / unloading port. Therefore, it becomes possible to automatically discharge the load on the first floor. Therefore, since it becomes easy to discharge the load from the first stage floor, the first stage floor can be positively used as a part of the loading platform for storing the load.

  The plurality of actuators on the first stage floor and the plurality of actuators on the second stage floor respectively correspond to each other, and the corresponding actuators are preferably controlled to be synchronized with each other.

  As a result, the actuators on the first floor and the actuators on the second floor can be controlled in association with each other, and control of the entire actuator becomes relatively easy.

  The controller controls the actuators of the first stage floor and the second stage floor so as to advance the load of the first stage floor and the load of the second stage floor to the carry-in / out port side. Driving the actuator, and then stopping the first stage floor actuator and driving the second stage floor actuator so that the second stage load is advanced to the loading / unloading side. preferable.

  As a result, when loads are placed on both the first floor and the second floor, the loads on both floors are first driven by simultaneously driving the actuators on both floors. Are moved to the loading / unloading exit side, and after the load on the first stage floor is transferred to the second stage floor, the actuator on the first stage floor is stopped to prevent useless operation. be able to. Accordingly, it is possible to improve the operation efficiency of the transport device.

  The transport device further includes first load detection means for detecting a load of the first stage floor actuator, and the control device includes the first stage floor actuator and the second stage floor actuator; When the first load detecting means detects that the load on the first stage floor actuator has fallen below a predetermined value, the first stage floor actuator is stopped. And it is preferable to drive the actuator of the said 2nd floor.

  Thereby, after the load on the first floor is discharged, the actuator on the first floor can be stopped, and the actuator can be stopped at an appropriate timing. Therefore, the operation efficiency of the transport device can be further improved.

  The longitudinal length of the second floor is longer than the longitudinal length of the first stage floor, and the control device advances the load of the second stage floor to the loading / unloading side. The second stage floor actuator is driven, and then the first stage floor load and the second stage floor load are advanced to the loading / unloading side. The actuator of the first stage is stopped and the second stage of the actuator is stopped so as to drive the actuator and the actuator of the second stage of the floor and then advance the load of the second stage to the loading / unloading side. It is preferable to drive the floor actuator.

  Thus, when a load is placed on both the first-stage floor and the second-stage floor, the actuator of the second-stage floor is first driven to Part of the cargo can be discharged with priority. Thereafter, the load on both floors can be advanced together by simultaneously driving the actuators on both floors. Then, after the load on the first stage floor is transferred to the second stage floor, useless operation can be prevented by stopping the actuator on the first stage floor. Therefore, the operation efficiency of the transfer device can be further improved.

  The transport device further includes first load detecting means for detecting a load of the first stage floor actuator, and second load detecting means for detecting a load of the second stage floor actuator, When the control device detects that the load on the second stage floor actuator has become a predetermined value or less by the second load detection means while driving the second stage floor actuator. Driving the first-stage floor actuator and the second-stage floor actuator, and driving the first-stage floor actuator and the second-stage floor actuator, When it is detected by the first load detecting means that the load of the actuator on the first stage floor is below a predetermined value, the actuator on the first stage floor is stopped and the actuator on the second stage floor is actuated. It is preferred to drive the over data.

  Thus, after the load on the actuators on the second stage floor is reduced, it is possible to start driving the actuators on the first stage floor and the second stage floor. Therefore, when driving both actuators simultaneously, the power for driving both actuators can be kept relatively small. Further, the actuator on the first floor can be stopped after the load on the first floor is discharged, and the actuator can be stopped at an appropriate timing. Therefore, the operation efficiency of the transport device can be further improved.

  The transport device further includes a position sensor that directly or indirectly detects a position of at least one floor board material belonging to each of the plurality of floor board material groups on the first stage floor and the second stage floor. The control device, for each of the first-stage floor and the second-stage floor, after completing the forward movement of the floor board material of any one floor board material group, Based on the detection of the position sensor, the plurality of floorboard members start returning, and the floorboard members of all floorboard members start moving backward after completion of the forward movement of floorboard members of all floorboard members. It is preferable to control the actuator.

  As a result, the floor board members of the floor board group always move forward or backward at an appropriate timing, so that it is possible to carry the load quickly and reliably.

  The length in the longitudinal direction of the second floor is longer than the length in the longitudinal direction of the first stage floor, and the conveying device is at least one belonging to each of the plurality of floor board material groups in the second stage floor. A position sensor that directly or indirectly detects the position of one floor board material, and the control device detects that the forward or backward movement of the floor board material on the second stage floor is completed by the position sensor. Then, the forward or backward movement of the floor board material on the first stage floor may be started.

  Since the second floor is longer than the first floor, the floor material of the first floor tends to move forward or backward more quickly than the floor material of the second floor. Therefore, there is a possibility that the forward or backward movement of the floor board material of the first stage floor is started before the forward or backward movement of the floor board material of the second stage floor is completed. However, according to the transport device, the forward or backward movement of the floor board material of the second stage floor is completed, but the forward or backward movement of the floor board material of the first stage floor is detected after being detected by the position sensor. Is started. Therefore, the floor board material of the first stage floor and the floor board material of the second stage floor can be accurately synchronized.

  ADVANTAGE OF THE INVENTION According to this invention, in the lorry provided with the loading platform which has the floor of the multi-stage from which height differs, it can accelerate | stimulate effectively using the floor of a higher level as a part of loading platform.

Embodiment 1
(Freight car and carrier)
As shown in FIG. 1 and FIG. 2, the cargo transport device according to the present embodiment is mounted on a truck 1 that is a so-called stepped trailer. The truck 1 includes a cab 2 and a loading platform 3. The loading platform 3 includes a high-level floor (hereinafter referred to as a high-level floor) 3a positioned behind the cab 2, and a low-level floor (hereinafter referred to as a low-level floor) 3b positioned behind the high-level floor 3a. And. The high floor 3a and the low floor 3b have different heights, and the low floor 3b is lower than the high floor 3a. The length in the longitudinal direction of the low floor 3b (in other words, the length in the vehicle longitudinal direction, the length in the left-right direction in FIGS. 1 and 2) is longer than the length in the longitudinal direction of the high floor 3a. .

(Configuration of cargo bed floor)
The upper floor 3a and the lower floor 3b are different in length in the longitudinal direction, but the other configurations are the same. Therefore, only the configuration of the low floor 3b will be described below, and detailed description of the high floor 3a will be omitted.

  As shown in FIG. 8, the floor 3 b includes a plurality of floor boards 10 arranged in a direction orthogonal to the longitudinal direction (left-right direction in FIG. 8). The plurality of floor boards 10 are divided into a plurality of groups. In the present embodiment, the plurality of floor board materials 10 are divided into three groups of a first floor board material group 11A, a second floor board material group 11B, and a third floor board material group 11C. However, in the present invention, the number of floor board material groups is not limited to three. The number of floor board material groups may be two or four or more.

  The plurality of floor board materials 10 belonging to each floor board material group 11A, 11B, 11C are arranged in every third. That is, in this embodiment, the floor board material 10 belonging to the first floor board material group 11A, the floor board material 10 belonging to the second floor board material group 11B, and the floor board material belonging to the third floor board material group 11C are arranged in this order. Yes. Further, such an arrangement pattern is sequentially repeated in a direction orthogonal to the longitudinal direction.

  The floor board materials 10 belonging to each of the floor board material groups 11A, 11B, and 11C are connected to each other so as to move forward and backward together. Specifically, a plurality of floor board materials 10 belonging to the first floor board material group 11A are connected via a horizontal board material 12A. A plurality of floor board materials 10 belonging to the second floor board material group 11B are connected via a horizontal board material 12B. The plurality of floor board materials 10 belonging to the third floor board material group 11C are connected via a horizontal board material 12C. In addition, these horizontal plate material 12A, 12B, 12C is a plate material extended in the direction which cross | intersects an orthogonal direction. However, the structure for connecting the floor boards 10 belonging to the respective floor board groups 11A, 11B, 11C is not limited to the structure using the horizontal boards 12A, 12B, 12C.

  A first hydraulic cylinder 13A, a second hydraulic cylinder 13B, and a third hydraulic cylinder 13C are connected to the horizontal plate members 12A, 12B, and 12C, respectively. The hydraulic cylinders 13A, 13B, and 13C are examples of actuators that reciprocate the floor board material 10 of the floor board material groups 11A, 11B, and 11C. In this embodiment, the hydraulic cylinders 13A, 13B, and 13C reciprocate the floor board material 10 of the floor board material groups 11A, 11B, and 11C via the horizontal board materials 12A, 12B, and 12C. However, the actuator according to the present invention may directly reciprocate the floor board material 10 of the floor board material groups 11A, 11B, and 11C.

  FIG. 4 is an enlarged plan view showing a state in which the hydraulic cylinders 13A, 13B, and 13C are connected to the horizontal plate members 12A, 12B, and 12C. The hydraulic cylinders 13A, 13B, and 13C include cylinder cases 131A, 131B, and 131C and piston rods 130A, 130B, and 130C, respectively. The horizontal plate members 12A, 12B, and 12C are connected to the tip portions of the piston rods 130A, 130B, and 130C, respectively. The cylinder cases 131 </ b> A, 131 </ b> B, 131 </ b> C are fixed to the chassis frame 14 disposed below the loading platform 3 of the truck 1.

(Reciprocation of floor board material)
Next, the reciprocating operation of the floor board material 10 at the time of carrying a load will be described. In the following description, forward movement refers to movement in the direction opposite to the direction in which cargo is advanced, and backward movement refers to movement in the direction in which cargo is advanced. The forward side end means the forward side end, and the backward side end means the backward side end. Therefore, when the cargo is carried out, the movement of the lorry 1 from the carry-in / out port 3c side toward the cab 2 side becomes the forward movement, and the movement from the cab 2 side toward the carry-in / out port 3c side becomes the backward movement. Become. When the cargo is carried out, the cab 2 side becomes the forward end, and the carry-in / out port 3c side becomes the backward end.

  In the state shown in FIG. 3, all the floor board members 10 of the floor board group 11A, 11B, 11C are positioned at the end of the return side (note that the right side of FIG. 3 is the return side and the left side of FIG. 3 is the forward side). To the moving side). At this time, the piston rods 130A, 130B, and 130C of the hydraulic cylinders 13A, 13B, and 13C are in the most contracted state.

  When transporting the load, from the above state, first, the piston rod 130C of the third hydraulic cylinder 13C, the piston rod 130B of the second hydraulic cylinder 13B, and the piston rod 130A of the first hydraulic cylinder 13A are sequentially extended. Thereby, the floor board material 10 of the third floor board material group 11C, the floor board material 10 of the second floor board material group 11B, and the floor board material 10 of the first floor board material group 11A are sequentially moved to the forward side end. FIG. 5 shows a state in which the floor board material 10 of the third floor board group 11C has moved forward. FIG. 6 shows a state in which the floor board 10 of the second floor board group 11B has moved forward. FIG. 7 shows a state where the floor board material 10 of the first floor board material group 11A has moved forward. Thus, when only the floor board material 10 of any one of the three floor board material groups 11A, 11B, and 11C moves forward, the floor board material 10 and the load (not shown) that are moving forward. ) Is smaller than the frictional force generated between the floor board material 10 of the stopped floor board group and the load, so that the load remains stopped.

  Subsequently, after the floor plate materials 10 of the floor plate material groups 11A, 11B, and 11C complete the forward movement, the piston rods 130A, 130B, and 130C of all the hydraulic cylinders 13A, 13B, and 13C are contracted simultaneously. Thereby, all the floor board | plate materials 10 of floor board | plate material group 11A, 11B, 11C move back all at once (refer FIG. 8). At this time, the load moves in accordance with the backward movement of the entire floor board 10. That is, the load moves together with the floor board material 10 and is conveyed in the backward movement direction.

  The forward and backward movement cycles of the floor board material 10 of the floor board material groups 11A, 11B, and 11C described above are repeatedly executed. Thereby, the load is sequentially conveyed and discharged from the floor 3b.

(Estimation or detection of floor board material position)
In addition, in order to perform the said cycle rapidly and efficiently, after the floor board material 10 of the 3rd floor board material group 11C reaches | attains an advancing side edge part, the floor board material 10 of the 2nd floor board material group 11B is immediately moved forward. It is preferable. Similarly, after the floor board material 10 of the second floor board material group 11B reaches the forward end, it is preferable to immediately move the floor board material 10 of the first floor board group 11A forward, and the first floor board material group 11A. After the floor board material 10 reaches the forward end, it is preferable to immediately perform the simultaneous return movement of the floor board materials 10 of all the floor board material groups 11A, 11B, and 11C. Therefore, when the floor board material 10 of the floor board material groups 11A, 11B, and 11C reaches the forward side end part or the backward side end part, it is detected or estimated, and when one operation is completed, the next operation may be started immediately. desirable.

  Various methods are conceivable as a method for specifying the time point when the floor board material 10 of the floor board material group 11A, 11B, 11C reaches the forward side end or the backward side end. For example, the minimum time required for the floor board 10 to move from the forward side end to the backward side end, or the minimum required to move from the backward side end to the forward side end The time taken is almost empirically known in advance. Therefore, when the time has elapsed, it may be estimated that the floor board material 10 has reached the backward side end or the forward side end, and the next operation may be started.

  However, as will be described later, when a traveling engine (not shown) of the lorry 1 is used as a driving source for driving the hydraulic cylinders 13A, 13B, 13C, etc., depending on the rotational speed of the engine, The operating speed of the hydraulic cylinders 13A, 13B, 13C changes. Therefore, the movement time between the forward side end and the backward side end of the floor board material 10 may change. Therefore, the position sensor may detect that the floor board material 10 has reached the forward end or the backward end.

  In the present embodiment, the transport device includes sensors A1 and A2 for detecting the position of the floor board material 10 of the first floor board material group 11A and the position of the floor board material 10 of the second floor board material group 11B. Sensors B1 and B2 and sensors C1 and C2 for detecting the position of the floorboard material 10 of the third floorboard group 11C are provided (see FIG. 9). The sensors A1, B1, and C1 detect that the piston rods 130A, 130B, and 130C of the hydraulic cylinders 13A, 13B, and 13C are in the most contracted state, and thereby the floor board material groups 11A, 11B, and 11C. It is detected that each of the floor boards 10 is located at the end on the return side. On the contrary, the sensors A2, B2, and C2 detect that the piston rods 130A, 130B, and 130C of the hydraulic cylinders 13A, 13B, and 13C are in the most extended state, respectively. It is detected that the floor board material 10 of 11B and 11C is located in the forward side edge part, respectively.

(Configuration of position sensor)
The specific configurations of the sensors A1, A2, B1, B2, C1, and C2 are not limited at all. Below, an example of sensor A1, A2 is demonstrated. The sensors B1, B2, C1, and C2 can be the same as the sensors A1 and A2.

  FIG. 10 is a side view of the hydraulic cylinder 13A and members disposed below the hydraulic cylinder 13A. FIG. 11 is a front view of the hydraulic cylinder 13A and members disposed below the hydraulic cylinder 13A. In FIG. 10, for convenience of explanation, a part of a connecting member 21 and a cover member 22 described later are cut out along the line AA shown in the drawing.

  A cover member 22 is connected via a connecting member 21 below the cylinder case 131A of the hydraulic cylinder 13A. The cover member 22 is formed in a cylindrical shape. An auxiliary shaft 20 is inserted into the cover member 22. The auxiliary shaft 20 is connected to the piston rod 130A of the hydraulic cylinder 13A, and reciprocates in conjunction with the piston rod 130A.

  The outer diameter of the auxiliary shaft 20 is smaller than the inner diameter of the cover member 22. Therefore, the outer surface 20a of the auxiliary shaft 20 and the inner surface 22a of the cover member 22 are separated from each other, and a gap exists between the outer surface 20a and the inner surface 22a. Inside the gap and on the outer surface 20a of the auxiliary shaft 20, a metal detection object 23 for the sensors A1 and A2 is attached.

  The detected body 23 is formed in a cylindrical shape, and the auxiliary shaft 20 is inserted through the inside thereof. The detected object 23 is attached on the outer surface 20 a of the auxiliary shaft 20. As a result, the body 23 to be detected reciprocates together with the auxiliary shaft 20 in conjunction with the piston rod 130A. In addition, the to-be-detected body 23 is comprised so that it may not be exposed from the inside of the cover member 22 during the reciprocation.

  The sensors A1 and A2 react to the detected body 23 when the separation distance from the detected body 23 becomes a predetermined value or less. That is, the sensors A <b> 1 and A <b> 2 are so-called proximity sensors, and are attached on the inner surface 22 a of the cover member 22. When the piston rod 130A is in the most contracted state, that is, when the floor board member 10 of the floor board group 11A is positioned at the end on the return side, the sensor A1 has a predetermined separation distance from the detected body 23. It is arranged to be a value. On the other hand, when the piston rod 130A is in the most extended state, that is, when the floor board material 10 of the floor board group 11A is positioned at the forward end, the sensor A2 has a separation distance from the detected object 23. It arrange | positions so that it may become the said predetermined value.

  Thus, when the floor board material 10 of the floor board material group 11A is positioned at the end of the backward movement side, the sensor A1 reacts to the detected body 23 positioned in the radial direction of the auxiliary shaft 20, and the floor board material group 11A When the floor board 10 is positioned at the forward end, the sensor A2 reacts to the detected object 23 positioned in the radial direction. In this way, it is possible to detect that the floor board material 10 is positioned at the forward side end or the backward side end.

(Hydraulic circuit)
FIG. 9 shows a hydraulic circuit 50 of the transfer device. As described above, the configuration of the high floor 3a is the same as that of the low floor 3b. Similarly to the first to third hydraulic cylinders 13A, 13B, 13C of the low stage floor 3b, the first stage 3 for advancing and retracting the floor board members 10 of the first to third floor board groups 11A, 11B, 11C also to the high stage floor 3a. To third hydraulic cylinders 113A, 113B, and 113C, respectively.

  The hydraulic circuit 50 is a circuit for driving the hydraulic cylinders 13A, 13B, 13C, 113A, 113B, 113C. In the present embodiment, the hydraulic cylinders 113A, 113B, 113C of the high floor 3a and the hydraulic cylinders 13A, 13B, 13C of the low floor 3b are provided in a common hydraulic circuit 50 so as to operate in synchronization with each other. Has been placed. However, the hydraulic circuit that drives the hydraulic cylinders 113A, 113B, and 113C of the high floor 3a may be separate from the hydraulic circuit that drives the hydraulic cylinders 13A, 13B, and 13C of the low floor 3b. Further, the hydraulic cylinders 113A, 113B, 113C of the high floor 3a and the hydraulic cylinders 13A, 13B, 13C of the low floor 3b can be operated independently without being synchronized with each other.

  The hydraulic circuit 50 includes a hydraulic tank 16, a hydraulic pump 17, a relief valve 18, and a filter 19. The hydraulic circuit 50 includes a first switching valve 15A, a second switching valve 15B, and a third switching valve 15C that switch the communication state between the hydraulic pump 17 and the hydraulic cylinders 13A, 13B, and 13C of the lower floor 3b. I have. Furthermore, the hydraulic circuit 50 includes a fourth switching valve 15D, a fifth switching valve 15E, and a sixth switching valve 15F that switch the communication state between the hydraulic pump 17 and the hydraulic cylinders 113A, 113B, and 113C of the high floor 3a. I have.

  The truck 1 is provided with a power take-out device (PTO) (not shown). This power take-out device is a device that takes power from a traveling engine (not shown) of the lorry 1. The hydraulic pump 17 is driven by the power extracted by the power extraction device. The hydraulic pump 17 pumps oil stored in the hydraulic tank 16. The amount of oil pumped by the hydraulic pump 17 (in other words, the hydraulic pressure given from the hydraulic pump 17) can be controlled by adjusting the engine speed.

  The first switching valve 15A, the second switching valve 15B, the third switching valve 15C, the fourth switching valve 15D, the fifth switching valve 15E, and the sixth switching valve 15F are solenoid-type three-position 6-port valves, respectively.

  When the spools of the switching valves 15A, 15B, 15C, 15D, 15E, and 15F are shifted to the extension side position, the oil is supplied to the extension side oil chambers of the hydraulic cylinders 13A, 13B, 13C, 113A, 113B, and 113C. At this time, power in the extending direction is transmitted to the piston rods 130A, 130B, and 130C.

  When the spools of the switching valves 15A, 15B, 15C, 15D, 15E, and 15F are shifted to the contraction side position, the oil is supplied to the contraction side oil chambers of the hydraulic cylinders 13A, 13B, 13C, 113A, 113B, and 113C. At this time, power in the contraction direction is transmitted to the piston rods 130A, 130B, and 130C.

  When the spools of the switching valves 15A, 15B, 15C, 15D, 15E, and 15F are shifted to the neutral position, the oil is collected in the hydraulic tank 16. At this time, power is not transmitted to the piston rods 130A, 130B, and 130C.

  The first switching valve 15A and the fourth switching valve 15D, the second switching valve 15B and the fifth switching valve 15E, the third switching valve 15C and the sixth switching valve 15F can be controlled by the control device 55 so as to be synchronized with each other. it can. Accordingly, the first hydraulic cylinder 13A and the first hydraulic cylinder 113A, the second hydraulic cylinder 13B and the second hydraulic cylinder 113B, and the third hydraulic cylinder 13C and the third hydraulic cylinder 113C expand and contract in synchronization with each other.

  On the other hand, the first switching valve 15A, the second switching valve 15B, and the third switching valve 15C are switched while holding the spools of the fourth switching valve 15D, the fifth switching valve 15E, and the sixth switching valve 15F in the neutral position. You can also. Thereby, only the hydraulic cylinders 13A, 13B, 13C of the low floor 3b can be operated.

  The relief valve 18 is for preventing an excessive increase in the hydraulic pressure of the hydraulic circuit 50. The relief valve 18 includes a valve body that opens when the hydraulic pressure rises to a set pressure.

  A first pressure sensor PS1 is arranged for each of the hydraulic cylinders 113A, 113B, 113C of the high floor 3a. The second pressure sensor PS2 is disposed in the hydraulic cylinders 13A, 13B, 13C of the low floor 3b. The pressure sensors PS1 and PS2 only need to be able to detect the hydraulic pressure of each of the hydraulic cylinders 113A, 113B, 113C, 13A, 13B, and 13C, and their installation positions and configurations are not particularly limited. As an installation position, the vicinity of a hydraulic cylinder, a valve port, etc. are mentioned. Further, the pressure sensors PS1 and PS2 are not necessarily provided in each of the hydraulic cylinders 113A, 113B, 113C, 13A, 13B, and 13C, but at least one of the hydraulic cylinders 113A, 113B, and 113C of the high floor 3a and a low stage. You may make it provide with respect to at least one of the hydraulic cylinders 13A, 13B, and 13C of the floor 3b.

  The transport device includes a control device 55. The control device 55 is connected to the hydraulic pump 17, the switching valves 15A, 15B, 15C, 15D, 15E, 15F, the sensors A1, A2, B1, B2, C1, C2 of the high floor 3a and the low floor 3b. . The controller 55 switches the switching valves 15A, 15B, 15C, 15D, 15E, and the like at an appropriate timing based on detection signals from the sensors A1, A2, B1, B2, C1, and C2 while the hydraulic pump 17 is being driven. Change the position of the 15F spool. As a result, the movements of the piston rods 130A, 130B, and 130C of the hydraulic cylinders 13A, 13B, 13C, 113A, 113B, and 113C are switched, and the floor board material 10 of the floor board material groups 11A, 11B, and 11C is reciprocated as described above. be able to.

(Cooperation of high and low floors)
The floor board material 10 of the high floor 3a and the floor board 10 of the low floor 3b may always reciprocate simultaneously. However, in the present embodiment, the following linkage operation is performed on the high floor 3a and the low floor 3b.

  In the present embodiment, at the time of discharging the load, first, only the floor board material 10 of the lower floor 3b is reciprocated. Next, the floor board material 10 of both the high stage floor 3a and the low stage floor 3b is reciprocated. Finally, only the floor board material 10 of the lower floor 3b is reciprocated again.

  Specifically, as shown in FIG. 12, first, in step S1, a discharge switch (not shown) is turned on. Then, the control device 55 proceeds to step S2 and starts the hydraulic pump 17, while holding the switching valves 15D, 15E, and 15F in the neutral position. Then, by appropriately switching the switching valves 15A, 15B, and 15C, the floor board material 10 of the floor board material groups 11A, 11B, and 11C is appropriately reciprocated in the low stage floor 3b. As a result, the load on the lower floor 3b is gradually discharged. At this time, the load is reduced as compared with the case where the hydraulic cylinders 113A, 113B, 113C, 13A, 13B, and 13C of both the high floor 3a and the low floor 3b are driven. Therefore, the engine speed can be set to a medium level (within a predetermined speed range).

  Next, it progresses to step S3 and it is determined whether the load of hydraulic cylinder 13A, 13B, 13C of the low stage floor 3b became small. This determination can be made based on whether the hydraulic pressure of the hydraulic cylinders 13A, 13B, and 13C is equal to or less than a predetermined value in response to the detection signal of the second hydraulic sensor PS2. That is, when the hydraulic pressures of the hydraulic cylinders 13A, 13B, and 13C are less than or equal to a predetermined value, it can be determined that the load has decreased. When the load decreases, the process proceeds to step S4.

  In step S4, the hydraulic cylinders 113A, 113B, 113C of the high floor 3a and the hydraulic cylinders 13A, 13B, 13C of the low floor 3b are driven simultaneously. Specifically, the control device 55 cancels the neutral state holding state of the switching valves 15D, 15E, and 15F, and switches the switching valves 15D, 15E, and 15F in synchronization with the switching valves 15A, 15B, and 15C. That is, the first switching valve 15A and the fourth switching valve 15D are switched simultaneously, the second switching valve 15B and the fifth switching valve 15E are switched simultaneously, and the third switching valve 15C and the sixth switching valve 15F are switched simultaneously. Thereby, the hydraulic cylinders 113A, 113B, 113C of the high floor 3a and the hydraulic cylinders 13A, 13B, 13C of the low floor 3b operate in synchronism with each other. And the floor board material 10 of floor board material group 11A, 11B, 11C reciprocates suitably in both the high stage floor 3a and the low stage floor 3b. As a result, the cargo is transported on both the high floor 3a and the low floor 3b. At this time, the engine speed is high (within a predetermined engine speed range higher than the medium engine speed range).

  In the present embodiment, the position sensors A1, A2, B1, B2, C1, and C2 detect that the floor board material 10 of the low floor 3b has reached the forward side end or the backward side end, and the detection result Based on the above, the switching valves 15A, 15B, 15C, 15D, 15E, and 15F are switched. Since the hydraulic cylinders 113A, 113B, 113C of the high floor 3a have a smaller load than the hydraulic cylinders 13A, 13B, 13C of the low floor 3b, the hydraulic cylinders 113A, 113B, 113C of the high floor 3a are lower. It tends to move faster than the hydraulic cylinders 13A, 13B, 13C of the step floor 3b. Therefore, while the reciprocating motion of the floor board material 10 is repeated, there is a possibility that the operation of the hydraulic cylinders 113A, 113B, 113C of the high floor 3a and the hydraulic cylinders 13A, 13B, 13C of the low floor 3b may be shifted. . However, in the present embodiment, it is detected that the floor board material 10 of the low stage floor 3b has reached the forward side end part or the backward side end part, and the switching valve 15D of the high stage floor 3a is detected based on the detection result. Switch between 15E and 15F. Therefore, even if the hydraulic cylinders 113A, 113B, 113C on the high stage side 3a complete the expansion / contraction operation earlier than the hydraulic cylinders 13A, 13B, 13C on the low stage floor 3b, the hydraulic cylinder 113A on the high stage side 3a. , 113B, 113C can start operating after waiting for completion of the expansion / contraction operation of the hydraulic cylinders 13A, 13B, 13C of the low floor 3b. Therefore, the hydraulic cylinders 113A, 113B, 113C on the high stage side 3a and the hydraulic cylinders 13A, 13B, 13C on the low stage floor 3b can be synchronized with high accuracy. In this case, the tuning means that the hydraulic cylinders 113A, 113B, and 113C on the high stage side 3a and the hydraulic cylinders 13A, 13B, and 13C on the low stage floor 3b have the same traveling direction, and the operation switching timings are simultaneous. It means that there is. That is, it does not necessarily mean that the time required for the expansion / contraction operation is the same.

  Next, it progresses to step S5 and it is determined whether the load of hydraulic cylinder 113A, 113B, 113C of the high floor 3a became small. This determination can be made based on whether the hydraulic pressure of the hydraulic cylinders 113A, 113B, 113C is equal to or less than a predetermined value in response to the detection signal of the first hydraulic sensor PS1. When the load on the high floor 3a is transported to the low floor 3b, the load is reduced. When the load decreases, the process proceeds to step S6.

  In step S6, the control device 55 holds the switching valves 15D, 15E, and 15F in the neutral position again. Then, by appropriately switching the switching valves 15A, 15B, and 15C, the floor board material 10 of the floor board material groups 11A, 11B, and 11C is appropriately reciprocated only in the low stage floor 3b. At this time, the engine speed again becomes a medium level.

  Then, when the transportation of the load on the lower floor 3b is finished, the discharge switch is turned off in step S7. Thereby, the unloading of the load is completed.

(Effect of embodiment)
As described above, according to the load transport device of the truck 1 according to the present embodiment, the load on the high floor 3a is automatically transported to the low floor 3b, and further automatically from the low floor 3b. Can be discharged. That is, it becomes possible to automatically discharge the load on the high floor 3a. Therefore, since it becomes easy to discharge a load from the high level floor 3a, it becomes possible to positively use the high level floor 3a as a part of the loading platform 3 that accommodates the load. As a result, a large capacity of the loading platform 3 can be achieved.

  According to this embodiment, the first to third hydraulic cylinders 113A, 113B, 113C are provided on the high floor 3a, and the first to third hydraulic cylinders 13A, 13B, 13C are provided on the low floor 3b. , They correspond to each other. Further, when transporting a load on both the high floor 3a and the low floor 3b, the corresponding actuators (that is, the hydraulic cylinders 113A and 13A, the hydraulic cylinders 113B and 13B, and the hydraulic cylinders 113C and 13C) Driven to tune. Therefore, according to the present embodiment, it is relatively easy to control the entire actuator, that is, the hydraulic cylinders 13A, 13B, 13C, 113A, 113B, and 113C.

  The hydraulic cylinders 113A, 113B, 113C of the high floor 3a and the hydraulic cylinders 13A, 13B, 13C of the low floor 3b are provided in the same hydraulic circuit 50. Therefore, the corresponding actuators can be operated in synchronism with a relatively simple configuration. Further, since the hydraulic cylinder is used as the actuator, it is possible to obtain an actuator that is relatively small and can exert a large force.

  According to this embodiment, first, the hydraulic cylinders 13A, 13B, and 13C are driven so as to move the load on the lower floor 3b, and then the load on the higher floor 3a and the load on the lower floor 3b are moved. The hydraulic cylinders 113A, 113B, 113C, 13A, 13B, and 13C are driven so as to move, and then the hydraulic cylinders 113A, 113B, and 113C are stopped so as to move the load on the lower floor 3b, while the hydraulic cylinders are stopped. 13A, 13B, and 13C are driven. Thereby, first, a part of the load of the low floor 3a can be discharged preferentially, and the load can be discharged quickly. In addition, after the load on the high floor 3a is transferred to the low floor 3b, it is possible to prevent wasteful operation of the hydraulic cylinders 113A, 113B, and 113C. Accordingly, it is possible to improve the operation efficiency of the transport device.

  In the present embodiment, power is taken out from the traveling engine by the power take-off device, and the hydraulic pump 17 (and thus the hydraulic cylinders 113A, 113B, 113C, 13A, 13B, 13C) is driven using the power. That is, the engine of the truck 1 is used as a drive source for the hydraulic cylinders 113A, 113B, 113C, 13A, 13B, and 13C. According to the control in the present embodiment, only the hydraulic cylinders 13A, 13B, 13C of the low stage floor 3b are driven at first, and the load of the high stage floor 3a is transferred to the low stage floor 3b. Only the hydraulic cylinders 13A, 13B, 13C of the floor 3b are driven. Therefore, the load of the engine as a power source can be suppressed. In other words, using only the engine of the lorry 1 as a drive source, the loads on both the high floor 3a and the low floor 3b can be automatically discharged without difficulty.

  In particular, in this embodiment, the load of the hydraulic cylinders 113A, 113B, and 113C is detected by the first pressure sensor PS1, and the load of the hydraulic cylinders 13A, 13B, and 13C is detected by the second pressure sensor PS2. Then, after driving the hydraulic cylinders 13A, 13B, 13C of the low stage floor 3b, it is confirmed that the load on the hydraulic cylinders 13A, 13B, 13C has decreased, and then the hydraulic cylinders 113A, 113B of the high stage floor 3a. , 113C. Therefore, when both the hydraulic cylinders 113A, 113B, 113C of the high stage floor 3a and the hydraulic cylinders 13A, 13B, 13C of the low stage floor 3b are driven, the engine load can be more reliably reduced.

  Further, when driving the hydraulic cylinders 113A, 113B, 113C of the high floor 3a and the hydraulic cylinders 13A, 13B, 13C of the low floor 3b, the loads of the hydraulic cylinders 113A, 113B, 113C of the high floor 3a Is confirmed, the hydraulic cylinders 113A, 113B, 113C are deactivated. Therefore, it is possible to more reliably detect that the load on the high floor 3a has been transported to the low floor 3b, and based on this detection, the transport operation on the high floor 3a can be stopped. Therefore, efficient operation without waste is possible.

  According to this embodiment, the sensors A1, A2, B1, B2, C1, and C2 that detect the position of the floor board material 10 are provided, and the floor board material 10 has reached the forward side end or the backward side end. The hydraulic cylinders 113A, 113B, 113C, 13A, 13B, and 13C are controlled while checking. Therefore, each floor board material 10 of the floor board material groups 11A, 11B, and 11C always moves forward or backward at an appropriate timing, so that the load can be transported quickly and reliably.

  Further, according to the present embodiment, the position sensor A1, A2, B1, B2, C1, C2 detects the completion of the forward or backward movement of the floor board material 10 of the low stage floor 3b, and then the high stage floor. The forward or backward movement of the floorboard material 3a is started. Therefore, the floor board material 10 of the low stage floor 3b and the floor board material 10 of the high stage floor 3a can be accurately synchronized.

<< Embodiment 2 >>
The hydraulic circuit 50 is not limited to that of the first embodiment. In the second embodiment, the hydraulic circuit 50 of the first embodiment is replaced with a hydraulic circuit 50B shown in FIG.

  In the present embodiment, the sensors A1, A2, B1, B2, C1, C2 for detecting the position of the floor board material 10 of the first to third floor board group 11A, 11B, 11C are also arranged on the high floor 3a. Has been.

  Also in the present embodiment, the hydraulic cylinders 113A, 113B, 113C of the higher floor 3a and the hydraulic cylinders 13A, 13B, 13C of the lower floor 3b are operated in synchronism with each other in the common hydraulic circuit 50B. Is arranged.

  The hydraulic circuit 50 </ b> B includes a hydraulic tank 16, a hydraulic pump 17, a relief valve 18, and a filter 19. The hydraulic circuit 50B includes a first switching valve 15A, a second switching valve 15B, and a third switching valve 15C that switch the communication state between the hydraulic pump 17 and the hydraulic cylinders 13A, 13B, 13C, 113A, 113B, and 113C. It has. Further, the hydraulic circuit 50B includes a fourth switching valve 15D, a fifth switching valve 15E, and a sixth switching valve 15F that switch the communication state between the hydraulic pump 17 and the hydraulic cylinders 113A, 113B, 113C of the high floor 3a. I have.

  The first hydraulic cylinder 113A of the higher floor 3a and the first hydraulic cylinder 13A of the lower floor 3b communicate with each other via a fourth switching valve 15D. The second hydraulic cylinder 113B of the high floor 3a and the second hydraulic cylinder 13B of the low floor 3b communicate with each other via the fifth switching valve 15E. The third hydraulic cylinder 113C of the higher floor 3a and the third hydraulic cylinder 13C of the lower floor 3b communicate with each other via a sixth switching valve 15F. In this way, the hydraulic cylinders 113A, 113B, 113C of the high floor 3a correspond to the hydraulic cylinders 13A, 13B, 13C of the low floor 3b, respectively.

  The first switching valve 15A, the second switching valve 15B, and the third switching valve 15C are solenoid type three-position 6-port valves. The inlet port of the first switching valve 15A is connected to the supply path on the hydraulic pump 17 side, and the outlet port is connected to the first hydraulic cylinders 13A and 113A side. Similarly, the inlet port of the second switching valve 15B is connected to the supply path on the hydraulic pump 17 side, and the outlet port is connected to the second hydraulic cylinders 13B and 113B side. The inlet port of the third switching valve 15C is connected to the supply path on the hydraulic pump 17 side, and the outlet port is connected to the third hydraulic cylinders 13C and 113C side.

  When the spools of the switching valves 15A, 15B, and 15C are shifted to the extension side position, the oil is supplied to the extension side oil chambers of the hydraulic cylinders 13A, 13B, and 13C. At this time, power in the extending direction is transmitted to the piston rods 130A, 130B, and 130C.

  When the spools of the switching valves 15A, 15B, 15C are shifted to the contraction side position, oil is supplied to the contraction side oil chambers of the hydraulic cylinders 13A, 13B, 13C. At this time, power in the contraction direction is transmitted to the piston rods 130A, 130B, and 130C.

  When the spools of the switching valves 15A, 15B, and 15C are shifted to the neutral position, the oil passes through the switching valves 15A, 15B, and 15C and is collected in the hydraulic tank 16. At this time, power is not transmitted to the piston rods 130A, 130B, and 130C.

  The fourth switching valve 15D, the fifth switching valve 15E, and the sixth switching valve 15F are solenoid type two-position four-port valves. When the spools of the fourth switching valve 15D, the fifth switching valve 15E, and the sixth switching valve 15F are shifted to the communication position, the first hydraulic cylinder 13A and the first hydraulic cylinder 113A, the second hydraulic cylinder 13B and the second hydraulic cylinder 113B. The third hydraulic cylinder 13C and the third hydraulic cylinder 113C communicate with each other. At this time, the first hydraulic cylinder 13A and the first hydraulic cylinder 113A, the second hydraulic cylinder 13B and the second hydraulic cylinder 113B, and the third hydraulic cylinder 13C and the third hydraulic cylinder 113C expand and contract in synchronization.

  On the other hand, when the spools of the fourth switching valve 15D, the fifth switching valve 15E, and the sixth switching valve 15F are shifted to the cutoff position, the first hydraulic cylinder 13A, the first hydraulic cylinder 113A, the second hydraulic cylinder 13B, and the second hydraulic pressure The communication between the cylinder 113B, the third hydraulic cylinder 13C, and the third hydraulic cylinder 113C is blocked. At this time, even if oil is supplied to the hydraulic cylinders 13A, 13B, and 13C of the low stage floor 3b, no oil is supplied to the hydraulic cylinders 113A, 113B, and 113C on the high stage floor 3a side, and these hydraulic cylinders 113A, 113B. 113C will not operate. That is, in this state, only the hydraulic cylinders 13A, 13B, 13C of the low floor 3b are operated.

  The relief valve 18 is for preventing an excessive increase in the hydraulic pressure of the hydraulic circuit 50, and is disposed between the hydraulic pump 17 and the switching valves 15A, 15B, 15C. The relief valve 18 includes a valve body that opens when the hydraulic pressure rises to a set pressure. In addition, although illustration is abbreviate | omitted, you may make it provide a relief valve also between switching valve 15D, 15E, 15F and hydraulic cylinder 113A, 113B, 113C.

  The control device 55 is connected to the hydraulic pump 17, the switching valves 15A, 15B, 15C, 15D, 15E, 15F, the sensors A1, A2, B1, B2, C1, C2 of the high floor 3a and the low floor 3b. . The controller 55 switches the switching valves 15A, 15B, 15C, 15D, 15E, and the like at an appropriate timing based on detection signals from the sensors A1, A2, B1, B2, C1, and C2 while the hydraulic pump 17 is being driven. Change the position of the 15F spool. As a result, the movements of the piston rods 130A, 130B, and 130C of the hydraulic cylinders 13A, 13B, 13C, 113A, 113B, and 113C are switched, and the floor board material 10 of the floor board material groups 11A, 11B, and 11C is reciprocated as described above. be able to.

  Also in this embodiment, the same effects as those of the first embodiment can be obtained.

<Modification>
In the present invention, the number of stages of the loading platform is not limited to 2, and may be 3 or more. That is, the loading platform may have three or more floors having different heights.

  In the above-described embodiment, the load is detected based on the hydraulic pressure of the hydraulic cylinders 113A, 113B, 113C, 13A, 13B, and 13C. However, the load detection means for detecting the load on the hydraulic cylinders 113A, 113B, 113C, 13A, 13B, 13C is not limited to that based on the hydraulic pressure. For example, load cells are arranged on the high floor 3a and the low floor 3b, and the hydraulic cylinders 113A, 113B, 113C, 13A, 13B, 13C are loaded on the basis of the weight of the load on the high floor 3a and the low floor 3b. The load may be detected. Moreover, the filling state of the load of the high floor 3a and the low floor 3b is detected using an optical sensor, a camera, etc., and the load of the hydraulic cylinders 113A, 113B, 113C, 13A, 13B, 13C is detected based on the filling state. Can also be detected.

  In the embodiment, when the hydraulic cylinders 13A, 13B, 13C are driven while the hydraulic cylinders 13A, 13B, 13C of the low stage floor 3b are driven, the hydraulic cylinders 113A, 113B, The driving of 113C was to be started. However, instead of detecting the load on the hydraulic cylinders 13A, 13B, and 13C, the driving of the hydraulic cylinders 113A, 113B, and 113C may be automatically started when a predetermined time elapses.

  In the above embodiment, when the hydraulic cylinders 113A, 113B, 113C of the high floor 3a and the hydraulic cylinders 13A, 13B, 13C of the low floor 3b are driven, the hydraulic cylinders 113A, 113A of the high floor 3a are driven. The hydraulic cylinders 113A, 113B, and 113C are stopped when the loads on the 113B and 113C are reduced. However, instead of detecting the load on the hydraulic cylinders 113A, 113B, 113C, it is also possible to automatically stop the hydraulic cylinders 113A, 113B, 113C when a predetermined time has elapsed.

  In the above embodiment, the actuators for moving the floor board 10 forward and backward are the hydraulic cylinders 113A, 113B, 113C, 13A, 13B, and 13C, but other types of actuators can of course be used. As another type of actuator, for example, another fluid pressure cylinder, an electric motor, or the like may be used.

  As described above, the present invention is useful for a cargo transportation device for a truck.

It is a side view of a truck. It is a top view of a truck. It is a schematic plan view of the conveyance apparatus of the load in a low stage floor. It is a top view which shows the connection structure of a hydraulic cylinder and a horizontal plate material. It is a top view which shows the state which the floor board material of the 3rd floor board material group moved to the forward end part. It is a top view which shows the state which the floor board material of the 2nd floor board material group moved to the forward end part. It is a top view which shows the state which the floor board material of the 1st floor board material group moved to the forward end part. It is a top view which shows the state which the floor board material of a 1st-3rd floor board material group moves to a return end part. 1 is a circuit diagram of a hydraulic circuit according to Embodiment 1. FIG. It is a side view of a hydraulic cylinder and the member arrange | positioned under it. It is a front view of a hydraulic cylinder and the member arrange | positioned under it. It is a control flowchart of the load conveying apparatus. 3 is a circuit diagram of a hydraulic circuit according to Embodiment 2. FIG.

Explanation of symbols

1 Lorry 2 Cab 3 Loading platform 3a High floor (first floor)
3b Low floor (second floor)
DESCRIPTION OF SYMBOLS 10 Floor board material 11A, 11B, 11C Floor board material group 12A, 12B, 12C Horizontal board material 13A, 13B, 13C Hydraulic cylinder (2nd stage floor actuator)
50 Hydraulic circuit 55 Controller 113A, 113B, 113C Hydraulic cylinder (first stage floor actuator)
PS1 pressure sensor (first load detection means)
PS2 pressure sensor (second load detection means)
A1, A2, B1, B2, C1, C2 sensors (position sensors)

Claims (8)

A load conveying device in a cargo vehicle including a first stage floor and a loading stage having a second stage floor lower than the first stage and positioned closer to the loading / unloading exit side than the first stage floor. There,
A plurality of floor board materials arranged in a direction orthogonal to the longitudinal direction, and a plurality of floor board materials grouped so that floor board materials adjacent in the orthogonal direction belong to different groups;
A plurality of actuators that are provided in each of the plurality of floor board material groups and reciprocate in the longitudinal direction simultaneously the floor board materials belonging to each floor board material group,
For each of the first stage floor and the second stage floor,
In each of the first-stage floor and the second-stage floor, by sequentially driving the plurality of actuators, the floor board materials of the plurality of floor board material groups are sequentially moved forward, and then the plurality of actuators are moved. A controller for advancing the load in the backward movement direction of the floor board material by simultaneously moving the floor board materials of the plurality of floor board material groups together by being driven simultaneously;
Cargo transportation equipment for trucks. The plurality of actuators on the first stage floor correspond to the plurality of actuators on the second stage floor, respectively.
Corresponding actuators are controlled to tune,
The cargo transportation device in the lorry according to claim 1. The controller is
The first-stage floor actuator and the second-stage floor actuator are driven so that the load on the first-stage floor and the load on the second-stage floor are advanced toward the loading / unloading side. ,afterwards,
Stopping the actuator of the first stage floor and driving the actuator of the second stage floor so as to advance the load of the second stage to the loading / unloading exit side,
3. A cargo transportation device in a truck according to claim 1 or 2. A first load detecting means for detecting a load of the actuator on the first stage floor;
When the first stage floor actuator and the second stage floor actuator are being driven, the control device applies a predetermined load to the first stage floor actuator by the first load detecting means. When it is detected that the value is less than or equal to the value, the first stage floor actuator is stopped and the second stage floor actuator is driven;
The cargo transportation device in the truck according to claim 3. The longitudinal length of the second floor is longer than the longitudinal length of the first floor,
The controller is
Driving the actuator of the second stage floor so as to advance the load of the second stage floor to the loading / unloading side,
The first-stage floor actuator and the second-stage floor actuator are driven so that the load on the first-stage floor and the load on the second-stage floor are advanced toward the loading / unloading side. ,afterwards,
Stopping the actuator of the first stage floor and driving the actuator of the second stage floor so as to advance the load of the second stage to the loading / unloading exit side,
3. A cargo transportation device in a truck according to claim 1 or 2. First load detecting means for detecting a load of an actuator on the first stage floor;
A second load detecting means for detecting a load of the actuator on the second stage floor,
The controller is
When the second-stage floor actuator is being driven and the second load detection means detects that the load on the second-stage floor actuator has fallen below a predetermined value, the first-stage floor actuator is driven. Driving the stage floor actuator and the second stage floor actuator;
When driving the first-stage floor actuator and the second-stage floor actuator, the load of the first-stage floor actuator becomes a predetermined value or less by the first load detecting means. Is detected, the first stage floor actuator is stopped and the second stage floor actuator is driven,
The cargo transport device in a truck according to claim 5. A position sensor that directly or indirectly detects a position of at least one floor board material belonging to each of the plurality of floor board material groups in the first stage floor and the second stage floor;
The control device is configured such that after the forward movement of the floor board material of any one floor board material group is completed in each of the first-stage floor and the second-stage floor, the floor of the floor board group to be moved next Based on the detection of the position sensor, the forward movement of the plate material is started, and the floor plate material of the whole floor board material group starts returning after the forward movement of the floor board material of the whole floor board material group is completed. Control the actuator,
The load conveying apparatus in the lorry as described in any one of Claims 1-6. The longitudinal length of the second floor is longer than the longitudinal length of the first floor,
A position sensor that directly or indirectly detects a position of at least one floor board material belonging to each of the plurality of floor board material groups in the second stage floor;
The controller detects the forward or backward movement of the floor board material on the first floor after the position sensor detects that the forward or backward movement of the floor board material on the second floor is completed. Start,
The cargo transportation device in the truck according to claim 2.

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