JP5982204B2 - Hydraulic mechanism for trucks and hydraulic mechanism for lifting platform - Google Patents

Description

  The present invention includes, for example, a roof opening and closing device that opens and closes a roof of a packing box for storing luggage, and a hydraulic mechanism for a truck that includes a load receiving platform lifting device that operates a load receiving platform for loading and unloading luggage, and Further, the present invention relates to a hydraulic mechanism for a load receiving table lifting device constituting a part thereof.

  A cargo box generally referred to as a wing vehicle is provided with a pair of left and right openable roofs (hereinafter also referred to as “wings”) shaped like wings when viewed from the rear. Some of the wing vehicles further include a load receiving table elevating device for operating a load receiving table for loading and unloading loads. Such a lorry having a wing that can be opened and closed and a cargo cradle includes a roof actuator (hydraulic cylinder) for opening and closing the wing, and an actuator for the cargo cradle for moving the cargo cradle up and down and sliding it back and forth. (Hydraulic cylinder) and a power unit for supplying hydraulic oil to each actuator.

  In the invention according to Patent Document 1, in the case where the load receiving device lifting device is mounted in the conventional wing vehicle, in addition to the power unit for opening and closing the wing, a separate power unit for driving the load receiving device is required. The hydraulic circuit is simplified by using a common power unit. In the hydraulic circuit according to the invention according to Patent Document 1, a plurality of ports of the common power unit include a roof actuator and a load receiving actuator (an actuator that performs a lift operation of the load receiving table and an actuator that performs a sliding operation of the load receiving table). ).

Japanese Patent No. 4063617

  However, in the above configuration, since the hydraulic circuit branches from the common power unit and reaches each actuator, there is a possibility that hydraulic oil is supplied to the roof actuator and the load receiving actuator at the same time.

  In particular, when an on-off valve (solenoid valve or the like) that controls the supply of hydraulic oil to the actuators or an electric circuit for the on-off valve fails due to leakage or the like caused by moisture entering the electrical wiring, etc. The hydraulic oil may be supplied to the roof actuator and the load receiving actuator at the same time.

  For this reason, even if one of the actuators is driven when the operator instructs the opening / closing of the wing and the operation of the load receiving table at the same time by the controller, or when the on-off valve or its electric circuit is broken. Since hydraulic oil may be supplied to the other actuator, both the wing opening / closing actuator and the load receiving table driving actuator may be driven. This was dangerous.

  Then, this invention makes it a subject to provide the hydraulic mechanism for lorries and the hydraulic mechanism for load receiving platform raising / lowering devices with high safety.

The present invention includes a load receiving table lifting device for operating a load receiving table for loading and unloading a load, and a roof opening and closing device for opening and closing a roof of a packing box for storing the load, the load receiving table lifting device and the roof opening and closing device A power unit that can be operated independently of the apparatus and supplies hydraulic oil for operating the load receiving platform elevating device and the roof opening and closing device, and a part of the load receiving elevating device, and a plurality of solenoid valves from the power unit And a roof for opening and closing the roof by supplying hydraulic oil from the power unit via a plurality of solenoid valves in a part of the roof opening and closing device. And at least one of the actuators, and the at least one actuator With respect to the current supplied from the power source for driving the plurality of solenoid valves for supplying the hydraulic fluid, energization of all of the plurality of solenoid valves can be prohibited collectively, or a hydraulic circuit among the plurality of solenoid valves An energization prohibition unit capable of prohibiting energization of a solenoid valve as a main valve located on the most upstream side of the actuator, and a control unit for controlling each of the plurality of solenoid valves, the actuator being driven among the actuators When there is a hydraulic pressure for a lorry, the energization prohibiting unit includes a control unit that controls an energization prohibiting unit provided corresponding to an actuator that is not a driving target among the actuators. Mechanism.

According to this configuration, the control unit controls the energization prohibiting unit provided corresponding to the actuator that is not the driving target among the actuators so as to prohibit energization. For this reason, the load receiving platform lifting device and the roof opening / closing device do not operate simultaneously.

A main unit side control unit for operating a plurality of solenoid valves for opening and closing a flow path of hydraulic oil supplied to the load receiving actuator, and the main unit side control unit, and is supplied to the roof actuator. A sub-unit-side control unit that operates a plurality of solenoid valves that open and close the flow path of the operating oil. The main-unit-side control unit and the sub-unit-side control unit operate on the driving actuator. Control in which the controller that does not operate a plurality of solenoid valves that open and close the flow path of the hydraulic oil supplied to the actuator when supplying oil is controlled to prohibit energization to the energization prohibition unit It may correspond to a part .

  In addition, an on-off valve that allows or prohibits the supply of hydraulic oil to each actuator is provided, and the on-off valve prohibits the energization of the energization prohibition unit, so that the flow of hydraulic oil corresponding to the actuator that is not driven You may interrupt | block a path | route and prohibit supply of the hydraulic fluid to the actuator which is not the said drive object. The on-off valve may be a solenoid valve that shuts off the flow path of the hydraulic oil when de-energized.

  Further, the energization prohibition unit may be a relay that prohibits the energization by opening a contact by excitation.

And this invention opens and closes the load receiving platform lifting / lowering device for operating the load receiving platform for loading and unloading the load by the hydraulically driven load receiving actuator and the roof of the packing box for storing the load by the hydraulically driven roof actuator and roof opening and closing device, said provided corresponding to at least one of the actuators, for each current supplied from the power source for driving a plurality of solenoid valves for supplying hydraulic oil to the at least one actuator, said plurality An energization prohibiting section capable of prohibiting energization of all of the solenoid valves at once , or energizing a solenoid valve as a main valve located on the most upstream side of the hydraulic circuit among the plurality of solenoid valves ; a receiving platform lifting device hydraulic mechanism for used for the lorry with the receiving platform lift instrumentation Separate independently be operated from the roof opening and closing device, and the receiving platform, a support mechanism for supporting said receiving platform to be movable up and down, and an actuator for said receiving platform, said receiving platform lifting device and the roof opening and closing device A power unit for supplying hydraulic oil for operation, and a control unit for controlling each of the plurality of solenoid valves, and when there is an actuator being driven among the actuators, A load receiving platform lifting mechanism hydraulic mechanism comprising: a control unit that controls an energization prohibition unit provided corresponding to an actuator that is not a driving target among the actuators.

  In the present invention, the load receiving platform lifting device and the different type drive device do not operate simultaneously. For this reason, a highly safe hydraulic mechanism for a truck can be provided.

It is a perspective view from the back of a lorry concerning one embodiment of the present invention. It is a side view which shows the cargo receiving stand raising / lowering apparatus which concerns on one Embodiment of this invention. FIG. 3 is a side view showing a state in which the load receiving platform is slid rearward from the state shown in FIG. 2 and the load receiving platform is unfolded and lifted after reaching a predetermined slide rear end position (extension position). It is a top view of the slide mechanism which shows the state which the slide drive device contracted most. It is the side view which abbreviate | omitted the raising / lowering mechanism and the load receiving stand from FIG. 2, and expanded the slide rail vicinity. It is a hydraulic circuit diagram which shows the structure of a power unit (a main unit and a sub unit). It is a block diagram regarding a power unit (a main unit and a subunit). It is a flowchart which shows control of the main unit side control part. It is the table | surface which showed the relationship between the input / output in a main unit, and the state of a roof opening / closing apparatus and a cargo receiving platform raising / lowering apparatus.

  Next, an embodiment of the present invention will be described. First, the basic configuration of a truck equipped with a hydraulic mechanism according to the present embodiment will be described. FIG. 1 is a perspective view from the rear of a truck according to the present embodiment. The state shown in the figure is a state in which the right wing (the roof on the right side when viewed from the rear) Wa of the cargo box B for storing the luggage is opened and the cargo can be loaded and unloaded from the right side, and the rear door D is opened to receive the cargo. In this state, the base 5 is raised.

  As shown in FIG. 2, a cargo box B is mounted on a chassis frame V <b> 1 of the vehicle V in the vehicle V that is a truck according to the present embodiment. As shown in FIG. 1, a right wing Wa and a left wing Wb are disposed on the top of the packing box B so as to be opened and closed by a roof opening and closing device. Each wing Wa, Wb has top surface portions Wa1, Wb1 that cover the upper surface of the packing box B, and hanging portions Wa2, Wb2 that hang from the left and right ends in the vehicle width direction of the top surface portions Wa1, Wb1. A subframe V2 for reinforcing the packing box B is disposed on the lower surface of the packing box B, and the subframe V2 is disposed so as to overlap the chassis frame V1. A retractable load receiving table lifting device is provided below the rear end of the chassis frame V1. In addition to the roof opening and closing device and the load receiving platform lifting device, the vehicle V may include a different type of driving device that operates a movable part provided in the vehicle V. Alternatively, this different kind of drive device may be provided instead of the roof opening and closing device. Further, this different kind of driving device may be one or plural.

[Outline of roof opening and closing device]
The roof opening / closing device for performing the opening / closing operation of the right wing Wa and the left wing Wb includes a roof actuator. As shown in FIG. 1, the roof actuator includes opening / closing cylinders WS1 and WS2 provided in pairs on the front and rear of the upper portion of the packing box B (illustration only on the rear side).

  In this embodiment, a cylinder is used as an actuator, but other mechanisms (for example, a hydraulic motor or the like) may be used as long as the mechanism can convert the hydraulic pressure of supplied hydraulic oil into a mechanical driving force. Good (the same goes for the loading platform lifting device).

  Each of the open / close cylinders WS1 and WS2 has a cylinder body rotatably attached to the cargo box B, and the tip of the piston rod is a top surface portion Wa1, Wb1 and a hanging portion Wa2, Wb2 of each wing Wa, Wb. It is attached so that it can rotate with respect to the vicinity of the connection point. Each wing Wa, Wb is attached to the cargo box B so as to be rotatable at an end portion near the center in the vehicle width direction at the top surface portion.

  As shown in FIG. 6, hydraulic oil is supplied to the open / close cylinders WS <b> 1 and WS <b> 2 from the main unit MU in the power unit described later via the sub unit SU. The right wing Wa is opened and closed by an opening / closing cylinder WS1 provided in pairs on the front and rear of the upper part of the packing box B. Similarly, the left wing Wb is opened and closed by a pair of opening / closing cylinders WS2.

[Outline of loading platform lifting device]
On the other hand, the load receiving platform elevating device includes a load receiving platform 5 and a support mechanism that supports the load receiving platform 5 so that the load receiving platform 5 can move back and forth. The support mechanism includes a slide mechanism S disposed on the chassis frame V1 and an elevating mechanism 4 attached to the slide mechanism S. In this load receiving table lifting device, a load receiving platform actuator composed of a slide cylinder 31 of the slide drive device 3 (shown in FIG. 4) and a lift cylinder 44 of the lifting mechanism 4 moves the load receiving table 5 up and down, whereby the vehicle V In the rear (right side in FIG. 2), the cargo can be loaded and unloaded from the packing box B. Hereinafter, the load receiving table lifting device will be described in detail.

[Slide mechanism]
First, the slide mechanism S will be described with reference to FIGS. In FIG. 2, a pair of left and right fixed support portions 1 provided in the vehicle width direction of the load receiving platform lifting device includes a pair of left and right slide rails 11 extending horizontally in the front-rear direction of the vehicle V. The slide rail 11 is fixed to the chassis frame V1 via a mounting bracket 12. The pair of left and right slide rails 11 are connected by a connecting member 13 made of a square pipe. A support plate 21 is supported on the slide rail 11 so as to be slidable in the front-rear direction of the vehicle V.

  The pair of left and right support plates 21 are integrated by a cross member 23 made of a square pipe extending horizontally in the vehicle width direction. A support bracket 24 is integrally welded to the cross member 23 outside the support plate 21 in the vehicle width direction. A pair of left and right support brackets 24 are also provided. Channel members 25 are welded to and connected to the lower portions of the pair of left and right support plates 21. A slide member 22 is connected to the support plate 21 (see FIG. 5), and the slide member 22 is slidable in the front-rear direction of the vehicle V. The slide member 22 includes a first slide member 220 on the front side and a second slide member 221 on the rear side. The slide members 220 and 221 are provided on the left and right sides of the support plate 21 so as to come into contact with the slide rail 11 by a load such as the load receiving platform 5.

  The support plate 21, the slide member 22, the cross member 23, the support bracket 24, and the channel member 25 constitute a movable side support portion 2 that can slide in the front-rear direction of the vehicle V with respect to the fixed side support portion 1. As shown in FIGS. 2 and 3, a guide roller 27 is provided behind each of the pair of left and right support plates 21.

[Slide drive]
Next, the slide drive device 3 that slides the movable side support portion 2 between the retracted position and the extended position will be described. In FIG. 4, the slide drive device 3 includes a pair of left and right double-acting slide cylinders 31 disposed between the left and right slide rails 11 in the vehicle width direction. The cylinder main bodies 31 a of the left and right slide cylinders 31 are overlapped with their front and rear ends arranged in opposite directions, and are integrally connected by a pair of front and rear joints 32. In the slide cylinder 31 on the right side of the vehicle, the tip of the piston rod 31b (see FIG. 5) is attached to the mounting plate. The mounting plate 14 is fixed to a substantially intermediate portion of the connecting member 13 in the vehicle width direction, and is one of the members constituting the fixed side support portion 1. Further, the slide cylinder 31 on the left side of the vehicle has a tip end portion of a piston rod 31b attached to a mounting base 26 extending in the vehicle front-rear direction. The mounting base 26 has a rear end portion fixed to a substantially intermediate portion in the vehicle width direction of the channel member 25, and a front end portion fixed to a substantially intermediate portion in the vehicle width direction of the cross member 23. . In addition to the channel member 25, the mounting base 26 is one of the members constituting the movable side support portion 2. With the above configuration, the support plate 21 can be slid relative to the slide rail 11 to the storage position indicated by the solid line in FIG. As shown in the figure, this storage position corresponds to a position where the cross member 23 comes into contact with a storage-side stopper 131 that protrudes rearward at a substantially intermediate portion of the connecting member 13 in the vehicle width direction. Further, by extending the pair of slide cylinders 31 together, the support plate 21 can be slid with respect to the slide rail 11 to the extended position indicated by the two-dot chain line in FIG. This overhanging position corresponds to the position where the protrusion 211 provided on the support bracket 24 abuts on the overhanging stopper 111 provided on the slide rail 11 as shown in the figure. With the above structure, the support plate 21 (movable side support portion 2) in the storage position is restricted from moving from the storage position to the front of the vehicle by the storage side stopper 113 and the cross member 23 coming into contact with each other in the storage position. In addition, movement from the overhanging position to the rear of the vehicle is restricted by the overhanging stopper 111 and the protrusion 211 coming into contact with each other at the overhanging position. The movable range of the support plate 21 (movable side support portion 2) is the movable (sliding) range of the load receiving platform 5. Whether the support plate 21 is in the retracted position or the extended position is detected by the retracted sensor MS1 and the extended sensor MS2 shown in FIGS.

[Elevating mechanism]
As shown in FIG. 2, the upper portion of the auxiliary link 41 is attached to the support bracket 24 so as to be rotatable within a certain range. An upper arm 42 is rotatably attached to the center of the auxiliary link 41, and a base end of a lift cylinder 44, which is a lifting drive device, is rotatable below the upper arm 42 and below the auxiliary link 41. It is attached. The tip of the lift cylinder 44 is connected to a predetermined position of the upper arm 42, and applies torque to the upper arm 42 by an expansion / contraction operation. A lower arm 43 is rotatably attached to the support bracket 24.

  The load receiving platform 5 is horizontally attached to the tips of the upper arm 42 and the lower arm 43, and the upper arm 42 and the lower arm 43 have their fulcrums (pins 40a, 40b) and action points (pins 40c, 40d). The connecting link forms a parallel link in which a parallelogram is formed.

  The auxiliary link 41, the upper arm 42, the lift cylinder 44, and the lower arm 43 are provided as a pair on the left and right sides to constitute an arm type lifting mechanism 4. The elevating mechanism 4 moves the tip end side (the load receiving platform 5) up and down by extending and contracting the lift cylinder 44. That is, at the rear of the chassis frame V1, as shown in FIG. 3, the ascent position corresponding to the floor of the cargo box B on the chassis frame V1 (that is, the same height as the floor surface of the cargo box B). And the ground contact position where the load receiving platform 5 is grounded to the ground can be raised and lowered.

[Receiver]
The load receiving platform 5 includes a base load receiving platform 51 that is horizontally attached to the distal ends of the upper arm 42 and the lower arm 43, and a front load receiving platform 53 that is foldably and foldably connected thereto. The base load receiving platform 51 and the front load receiving platform 53 are rotatably connected. As a result, the front part receiving platform 53 is folded on the base receiving platform 51 during storage. In use, the front part receiving platform 53 is deployed, and a continuous receiving surface from the base receiving base 51 to the front receiving platform 53 is formed. Whether or not the cargo receiving tray 5 is folded is detected by a folding sensor MS3 shown in FIG.

[Operation of lifting platform lifting device]
In the load receiving table lifting apparatus configured as described above, the operation until the load receiving stand 5 is in the deployed state from the storage position will be described. When the slide drive device 3 (see FIG. 4) is extended from the state of FIG. 2, the folded cradle 5 moves to the rear of the vehicle. When the lift cylinder 44 is contracted from this state, the parallel link formed by the upper arm 42 and the lower arm 43 rotates downward, and the base load receiving platform 51 moves downward. When the parallel link rotates in this manner, the front load receiving base 53 is placed on the guide roller 27. That is, the surface (load receiving surface) of the front load receiving stand 53 is in contact with the guide roller 27 from above. Further, since the front part receiving platform 53 is rotatable with respect to the base receiving platform 51, the front receiving stage 53 that has been in the horizontal posture in the front-rear direction gradually moves as the base receiving platform 51 moves downward. Inclined posture. As a result, the front load receiving stand 53 is supported from the front side of the vehicle by the guide roller 27 while being in a folded state, and has an inclined posture. Then, the worker rotates the front part receiving platform 53 to the rear of the vehicle and grounds the front receiving base 53 to the ground. Thereby, the goods receiving stand 5 will be in an unfolded state.

  With the load receiving stand 5 deployed, the load can be loaded into the packing box B by placing the load on the load receiving stand 5 and then extending the lift cylinder 44 to raise the load receiving stand 5. On the other hand, after the load in the load box B is placed on the upper surface of the load receiving platform 5 in the raised position, the lift cylinder 44 is contracted and the load receiving table 5 is lowered to lower the load in the load receiving box B to the ground. it can.

  The operation until the loading platform 5 in the unfolded state is placed in the retracted state is opposite to this, and the operator rotates the front loading platform 53 forward and leans against the guide roller 27. Then, the lift cylinder 44 is extended to rotate the parallel link upward. At this time, the front load receiving base 53 is automatically rotated with respect to the base load receiving base 51 while being supported by the guide roller 27, and the front load receiving base 53 in the inclined posture gradually becomes a horizontal posture. Change. Then, the slide driving device 3 is contracted, and the load receiving platform 5 is moved forward until the retracted state is reached.

[Power unit]
Next, a description will be given of a power unit that supplies hydraulic oil for operating the roof opening and closing device and the cargo receiving platform lifting device. FIG. 6 shows a hydraulic circuit diagram, and FIG. 7 shows a block diagram. The power unit of the present embodiment includes a main unit MU and a subunit SU.

[Main unit]
The main unit MU supplies hydraulic oil to the roof actuators (opening / closing cylinders WS1, WS2) in the roof opening / closing device and the load receiving actuators (slide cylinder 31, lift cylinder 44) in the load receiving lift device. The sub unit SU is located between the main unit MU and the roof actuator, and has solenoid valves 1 to 4 (So1 to So4) that can allow and prohibit the supply of hydraulic oil from the main unit MU to the roof actuator. .

  By comprising in this way, the supply source of hydraulic oil can be concentrated in the main unit MU. That is, the supply source of hydraulic oil can be shared by the roof opening and closing device and the load receiving table lifting device. For this reason, the hydraulic circuit is simplified as a whole and an inexpensive hydraulic mechanism can be realized as compared to providing two systems for the hydraulic circuit for the roof opening and closing device and the hydraulic circuit for the load receiving platform lifting device.

  The configuration of the main unit MU is basically the same as the configuration of the power unit described in Patent Document 1. As shown in FIG. 6, the main unit MU has four solenoid valves as a hydraulic pump P for discharging hydraulic oil and as an on-off valve. The flow path is opened by excitation and closed (shut off) when not excited. A to D (SoA to SoD), a reservoir tank T, and a relief valve, a check valve, a filter, and a variable throttle valve, although not denoted by reference numerals in the drawing. These components are housed in a case. Moreover, the port for taking out and taking in hydraulic fluid with respect to the outside of a unit is provided in five places on the said case. Of these, the first port PM 1 is connected to the lift cylinder 44. The second port PM2 and the third port PM3 are connected to the slide cylinder 31. The slide cylinder 31 is extended by the hydraulic oil supplied from the second port PM2, and the slide cylinder 31 is contracted by the hydraulic oil supplied from the third port PM3. The fourth port PM4 is a port for sending hydraulic oil to the subunit SU, and the fifth port PM5 is a port for receiving hydraulic oil returning from the subunit SU.

  The solenoid valve A (SoA) is energized when the lift cylinder 44 contracts to open the hydraulic fluid flow path. As a result, the hydraulic oil flows from the lift cylinder 44 to the reservoir tank T. The solenoid valve B (SoB) is excited when the lift cylinder 44 extends and contracts to open the hydraulic fluid flow path. As a result, hydraulic fluid is supplied from the hydraulic pump P to the lift cylinder 44 during expansion, and hydraulic fluid flows from the lift cylinder 44 through the solenoid valve A (SoA) to the reservoir tank T during contraction. The solenoid valve C (SoC) is excited when the slide cylinder 31 extends to open the hydraulic fluid flow path. As a result, hydraulic oil is supplied from the hydraulic pump P to the slide cylinder 31. The solenoid valve D (SoD) is excited when the slide cylinder 31 contracts to open the hydraulic fluid flow path. As a result, hydraulic oil flows from the slide cylinder 31 (left chamber in the figure) to the reservoir tank T (at this time, hydraulic oil is supplied from the hydraulic pump P to the right chamber in the figure of the slide cylinder 31).

  As shown in FIG. 7, the main unit MU includes a main unit side control unit MC for controlling each unit in the unit and around the unit. The main unit MU includes a main power switch Sw10, a load receiving table operation switch (an up switch Sw11, a down switch Sw12), a retractable sensor MS1, an overhang sensor MS2, a folding sensor MS3, a hydraulic pump P, solenoid valves A to D (SoA). ~ SoD) are connected. Further, it is also connected to the subunit-side control unit SC of the subunit SU and the relay R for power cutoff of the roof opening / closing device.

[Subunit]
The sub unit SU includes five solenoid valves 1 to 5 (So1 to So5) that are opened and closed by excitation and closed (shut off) when the excitation is not performed. As described above, the solenoid valves 1 to 4 (So1 to So4) can allow and prohibit the supply of hydraulic oil to the roof actuator. As shown in FIG. 6, in this embodiment, the solenoid valve 1 (So1) and the solenoid valve 2 (So2) constitute one three-position valve, and the solenoid valve 3 (So3) and the solenoid valve 4 (So4) are one. Three three-position valves are configured. As can be understood from the description of FIG. 6, each three-position valve moves the spool by an electromagnetic force when excited, and the hydraulic pump P of the main unit MU and the opening / closing cylinder WS <b> 1 that is the supply target of hydraulic oil. The oil chamber in WS2 is communicated. That is, supply of hydraulic oil to the open / close cylinders WS1 and WS2 is allowed. On the other hand, when de-energized, the spool returns to the intermediate position (the center position shown in the figure) by the spring, and the hydraulic pump P and the oil chamber in the open / close cylinders WS1 and WS2 are disconnected. That is, the supply of hydraulic oil to the open / close cylinders WS1 and WS2 is prohibited. In the description of the present embodiment, the solenoid valves 1 to 4 (So1 to So4) will be described as four separate valves for convenience.

  Further, although not indicated in the figure, the subunit SU includes a relief valve, a check valve and the like. These components are housed in a case. Moreover, the port for taking out and taking in hydraulic fluid with respect to the outside of a unit is provided in six places on the said case. The first port PS1 and the second port PS2 are connected to the opening / closing cylinder WS1. The third port PS3 and the fourth port PS4 are connected to the opening / closing cylinder WS2. The open / close cylinders WS1 and WS2 are extended by the hydraulic oil supplied from the first port PS1 and the third port PS3, and the open / close cylinders WS1 and WS2 are extended by the hydraulic oil supplied from the second port PS2 and the fourth port PS4. Contracts. The fifth port PS5 is a port for receiving hydraulic oil from the main unit MU, and the sixth port PS6 is a port for sending hydraulic oil returning to the main unit MU.

  The solenoid valve 1 (So1) and the solenoid valve 3 (So3) are excited when the open / close cylinders WS1 and WS2 extend and are opened so that the flow paths of the hydraulic oil intersect. As a result, the hydraulic oil is supplied from the main unit MU to the illustrated right chamber of the open / close cylinders WS1 and WS2, while the hydraulic oil returns from the left chamber of the open / close cylinders WS1 and WS2 to the main unit MU. The solenoid valve 2 (So2) and the solenoid valve 4 (So4) are energized when the open / close cylinders WS1 and WS2 contract and are opened so that the flow paths of the hydraulic oil are parallel to each other. As a result, the hydraulic oil is supplied from the main unit MU to the illustrated left chamber of the open / close cylinders WS1 and WS2, while the hydraulic oil returns from the illustrated right chamber of the open / close cylinders WS1 and WS2 to the main unit MU. The solenoid valve 5 (So5) is provided immediately after the downstream side of the fifth port PS5 and is opened only when the roof actuator is operable, and the roof operation switches Sw21 and Sw22 are turned on. It is excited and released.

  As shown in FIG. 7, the subunit SU includes a subunit-side controller SC for controlling each part in the unit and around the unit. The sub unit SU is connected to a roof operation switch (right wing operation switch Sw21, left wing operation switch Sw22) and solenoid valves 1 to 5 (So1 to So5). It is also connected to the main unit side control unit MC of the main unit MU.

  Since the sub unit SU is not provided with a hydraulic pump, the sub unit side controller SC issues an activation request signal Sig2 to the main unit MU in order to supply hydraulic oil to the roof actuator. Specifically, the activation request signal Sig2 is a signal for requesting activation of the hydraulic pump P in the main unit MU. As a result, hydraulic oil is supplied from the hydraulic pump P to the roof actuator via the fifth port PS5.

[Energization prohibition part (relay)]
Further, the subunit SU includes a relay R as an energization prohibition unit. This relay R is arranged so that energization can be permitted or prohibited between a power source (vehicle battery) (not shown) and solenoid valves 1 to 5 (So1 to So5). That is, the relay R can inhibit energization of the current supplied from the power source to drive the roof actuator. In the present embodiment, the relay R is directly connected to the power supply (not shown), but the connection mode is not limited to this, and may be connected with the main unit MU interposed therebetween, for example. In addition, the relay R of this embodiment is configured to prohibit energization by opening the contact by excitation (B contact). By using the relay R as the energization prohibition unit, the energization prohibition unit can be configured with general-purpose electrical components, which is advantageous in terms of cost.

  This relay R is used to generate a current that excites the solenoid valves 1 to 5 (So1 to So5) during operation of the load receiving platform lifting device (while the load receiving actuator (the slide cylinder 31 or the lift cylinder 44 is driven)). The valves are configured to be shut off collectively. When the current is interrupted, the solenoid valves 1 to 5 (So1 to So5) are de-energized and the hydraulic fluid flow path is interrupted. Therefore, if any of the solenoid valves 1 to 5 (So1 to So5) fails or one of the solenoid valves 1 to 5 (So1 to So5) malfunctions due to a failure in the electric circuit, Even if a situation occurs, the hydraulic oil flow path in the valve is forcibly cut off, so that the hydraulic oil is supplied to the roof actuators (open / close cylinders WS1 and WS2) that are actuators that are not driven. It is prohibited. For this reason, it can prevent reliably that a roof opening / closing apparatus will operate | move accidentally during the operation | movement of a cargo receiving platform raising / lowering apparatus.

[Control of roof lifting device]
The main unit side control unit MC excites the relay R when the load receiving table operation switch (the raising switch Sw11 or the lowering switch Sw12) is turned on (details will be described later in the description of the control flow). Since the relay R is connected to the B contact as described above, energization is prohibited when excited. When energization is prohibited in this way, solenoid valves 1 to 5 (So1 to So5) are not excited. For this reason, the solenoid valves 1 to 5 (So1 to So5) are not opened.

  Here, the supply source of the hydraulic oil is concentrated in the main unit MU as described above. However, the hydraulic circuit of the roof opening / closing device and the hydraulic circuit of the load receiving platform lifting device are completely connected by a switching valve or the like due to cost. There is no structure for switching, that is, when hydraulic oil is supplied to one hydraulic circuit, no hydraulic oil is supplied to the other hydraulic circuit. For this reason, for example, when the operator instructs the controller to open / close the wings Wa and Wb and raise / lower the load receiving table 5 at the same time, or when the solenoid valves 1 to 5 (So1 to So5) have failed due to electric leakage, There is a possibility that hydraulic oil is supplied to the load receiving actuator and the roof actuator simultaneously. As described above, since the hydraulic oil is supplied to the hydraulic circuits at the same time, there is a possibility that the roof opening / closing device may be operated at the same time during the operation of the load receiving platform lifting / lowering device.

  On the other hand, in this embodiment, when the relay R interrupts | blocks an electric current, the solenoid valves 1-5 (So1-So5) can be hold | maintained in a closed state. For this reason, hydraulic fluid can be prevented from being supplied to the roof actuators (opening and closing cylinders WS1, WS2). Therefore, it can suppress that a roof opening / closing apparatus operate | moves accidentally during the operation | movement of a cargo receiving platform raising / lowering apparatus, and safety is high.

[Detector]
The sub-unit control unit SC is connected with a detection unit SS1 that detects the driving of the roof actuator in order to prohibit the operation of the load receiving platform lifting device during the operation of the roof opening and closing device. The detection unit SS1 detects driving of the roof actuator by detecting a signal for driving the roof actuator (detection target actuator). The signal to be detected in the present embodiment is a switch input signal transmitted from the roof operation switches Sw21 and Sw22 provided to the controller operated by the operator to the subunit side control unit SC. As described above, in the case of the configuration in which the switch input signals of the roof operation switches Sw21 and Sw22 are detected, it can be dealt with only by changing the sequence or adding the configuration for detection to the existing electric circuit. Therefore, there is no need to greatly change the configuration of the electric circuit for this purpose, and there is an advantage that the increase in the electric wiring for corresponding to the detection can be minimized.

[Control of lifting platform lifting device]
When the detection unit SS1 detects the detection target switch input signal, the sub-unit side control unit SC issues a roof opening / closing signal Sig1 to the main unit side control unit MC. The main unit side control unit MC that has received the roof opening / closing signal Sig1 has solenoid valves A to D (SoA to SoD) that allow and prohibit the supply of hydraulic oil to the load receiving actuator (control target actuator) in the main unit MU. Opening and closing so that the receiving platform 5 stops. Here, the term “stop” means that the load receiving platform 5 is stopped by not applying hydraulic pressure to the load receiving platform actuator, and the load receiving platform lifting device at the end of the movable range is attached to the outer side toward the end of the movable range. This includes both (apparent) stopping of the load receiving platform 5 by applying hydraulic pressure to the load receiving actuator. Specifically, the “apparent stop” means that, as shown in FIG. 5, the support plate 21 (movable side support portion 2) in the storage position has the storage side stopper 113 and the cross member 23 in the storage position. The movement from the retracted position to the front of the vehicle is restricted by the contact, and the movement from the protruding position to the rear of the vehicle is restricted by the contact between the protruding stopper 111 and the projection 211 at the extended position. It means that it is in a stopped state. The “end portion” includes a position near the end portion.

  As in the control flow described later, the opening and closing of the solenoid valves A to D (SoA to SoD) by the main unit side control unit MC that has received this roof opening / closing signal Sig1 is provided in a controller operated by an operator. It is set so as to be superior to the operation signal instructed to the main unit side control unit MC from the cargo receiving operation switches Sw11 and Sw12. For this reason, even if the operator operates the controller and an operation instruction for the load receiving platform elevating device is made during the operation of the roof opening and closing device, the operation signal related to the operation instruction is ignored in the main unit control unit MC. The same applies to the case where an erroneous operation signal is issued regarding the load receiving platform lifting device during the operation of the roof opening / closing device due to electric leakage or the like, and the erroneous operation signal is ignored by the main unit side control unit MC.

  In the present embodiment, the solenoid valves A to D (SoA to SoD) are opened and closed (the solenoid valve A, B, D (SoA, SoB, SoD) is closed in the example shown in FIG. 9) so that the load receiving platform 5 stops. ) Is clarified by the main unit side control unit MC, so that the hydraulic oil is not supplied to the load receiving actuators (the slide cylinder 31 and the lift cylinder 44) unless the solenoid valve itself malfunctions. For this reason, it can suppress that a load receiving stand raising / lowering apparatus operate | moves accidentally during operation | movement of a roof opening / closing apparatus. Therefore, safety is high.

[Control flow (control unit on the main unit)]
Next, control of the main unit side control unit MC in the automatic operation mode of the present embodiment will be described with reference to FIG. 8 which is a flowchart. The main unit side control unit MC of the present embodiment is actually configured to be able to switch the operation mode between the automatic operation mode and the manual operation mode, but only the control flow of the automatic operation mode will be described here. . In FIG. 8, the solenoid valve is indicated as “SOL.”.

  First, the unit activation flag F is turned off in the main unit side controller MC (S1). The unit activation flag F is a flag for identifying that the roof opening / closing device is operable in the main unit side control unit MC. Next, it is determined whether or not there is a roof opening / closing signal Sig1 which is a signal derived from the detection unit SS1 from the subunit side control unit SC (S2).

  When there is a roof opening / closing signal Sig1 in S2, it is determined whether or not the cargo receiving platform 5 is in the retracted state or the extended state (S3). Each state is detected by the retract sensor MS1 and the overhang sensor MS2.

  When the receiving platform 5 is in the retracted state or the extended state in S3, it is determined whether or not there is an activation request signal Sig2, which is a signal for requesting the supply of hydraulic oil from the sub-unit-side control unit SC to the main unit MU. (S4). On the other hand, if it is not the storage state or the overhanging state in S3, the process skips to before S18.

  When the activation request signal Sig2 is present in S4, the unit activation flag F is turned on in the main unit side control unit MC (S5), and the hydraulic pump P is subsequently activated (S6). Thereby, hydraulic fluid is supplied from the main unit MU to the subunit SU. At this time, the solenoid valve 5 (So5) of the subunit SU is opened. On the other hand, if there is no activation request signal Sig2 in S4, the process skips to before S18.

  Next to S6, it is determined whether or not the receiving platform 5 is in the retracted state (S7). If it is in the retracted state at S7, the lift cylinder 44 is stopped and the slide cylinder 31 is contracted (S8) by not exciting the solenoid valves A to D (SoA to D) (closing the flow path). As a result, the receiving platform 5 is held at the storage position. On the other hand, when it is not in the retracted state in S7 (that is, when it is in the extended state), only the solenoid valve C (SoC) is opened and the slide cylinder 31 is extended (S9). At this time, since the projection 211 of the movable support 2 is in contact with the overhanging stopper 111, the lift cylinder 44 stops in the extended state. As a result, the load receiving platform 5 is held at the overhang position.

  When there is no roof opening / closing signal Sig1 in S2, it is determined whether or not the controller ascent switch Sw11 is turned on (S10). When the raising switch Sw11 is turned on in S10, it is determined whether or not the cargo receiving stand 5 is folded (S11). This state is detected by the folding sensor MS3.

  When the load receiving platform 5 is folded in S11, after starting the hydraulic pump P, only the solenoid valve D (SoD) is opened and the slide cylinder 31 is contracted (the lift cylinder 44 is stopped) (S12). Thereby, the receiving tray 5 is stored. On the other hand, when the load receiving stand 5 is not folded in S11, the solenoid valve B and C (SoB, SoC) are opened after starting the hydraulic pump P, and the slide cylinder 31 and the lift cylinder 44 are extended (S13). ). Thereby, the cargo receiving stand 5 is raised at the overhang position.

  If the controller up switch Sw11 is not turned on in S10, it is determined whether or not the controller down switch Sw12 is turned on (S14). When the lowering switch Sw12 is turned on in S14, it is determined whether or not the cargo receiving platform 5 is in the overhanging state (S15).

  In the extended state in S15, the hydraulic pump P remains stopped and the solenoid valves A to C (SoA to SoC) are opened, and the lift cylinder 44 is contracted while maintaining the extended state of the slide cylinder 31. (S16). Thereby, the cargo receiving stand 5 is lowered at the extended position. If not in the overhanging state in S15, the hydraulic pump P is activated and only the solenoid valve C (SoC) is opened, and the slide cylinder 31 is extended (the lift cylinder 44 is stopped) (S17). Thereby, the goods receiving stand 5 is pulled out.

  Next to S8, S9, S12, S13, S16, and S17, it is determined whether or not the unit activation flag F is off (S18). If the unit activation flag F is OFF in S18, it is determined whether the receiving platform 5 is in the retracted state or the extended state (S19). On the other hand, when the unit activation flag F is on in S18, the relay R of the subunit SU is de-energized (S20). Here, since the relay R is connected to the B contact, energization is permitted in a non-excited state. Thereby, the roof opening and closing device can be operated.

  If the load receiving platform 5 is in the retracted state or the extended state in S19, it is determined whether or not the ascending switch Sw11 or the descending switch Sw12 that is the load receiving operation switch of the controller is turned on (S21). On the other hand, if the receiving platform 5 is not in the retracted state or the extended state in S19, the relay R of the subunit SU is excited (S22). Here, since the relay R is connected to the B contact, energization is prohibited in the excited state. Accordingly, the closed state of the solenoid valves 1 to 5 (So1 to So5) is maintained, and the operation of the roof opening and closing device is prohibited.

  When the ascending switch Sw11 or the descending switch Sw12 that is the load receiving operation switch of the controller is turned on in S21, the relay R of the subunit is excited (S23), and the solenoid valves 1 to 5 (So1 to So5) are closed. Hold and prohibit the operation of the roof opening and closing device. On the other hand, if the controller's up switch or down switch is not turned on in S21, the relay R of the sub unit SU is de-energized (S24), and the roof opening and closing device is enabled.

  Next to S20, S22, S23, and S24, it is determined whether or not the main power switch Sw10 provided in the cab (cab) is turned off (S25). When the switch is turned off in S25, the main power is turned off in the main unit side controller MC, and the control flow is ended (S26). On the other hand, if the switch is not turned off in S25, the process returns to S1. The control flow of the main unit side controller MC is as described above.

  In addition, although a flowchart is not shown for the control of the subunit side control unit SC, the solenoid valve corresponding to the opening / closing operation is turned on according to the instructions of the controller (the opening / closing instruction of the right wing Wa, the opening / closing instruction of the left wing Wb). Open and close. Also, as shown in FIG. 7 (block diagram), the roof opening / closing signal Sig1 (corresponding to S2) and the activation request Sig2 (corresponding to S4) are transmitted to the main unit control unit MC.

  FIG. 9 shows a table showing the relationship between the input / output in the main unit MU and the state of the roof opening / closing device and the load receiving platform lifting device. “◯” in the table indicates a state in which a current (or a signal) related to the input flows with respect to the input, and indicates a state in which each element is turned on with respect to the output. On the other hand, “x” in the table indicates a state in which no current (or signal) related to the input is flowing with respect to the input, and indicates a state in which each element is off with respect to the output. Note that “-” in the table indicates that the sequence is not set.

  The first level from the top of FIG. 9 corresponds to a state corresponding to S8 of the control flow, and the second level corresponds to a state corresponding to S9. The third level corresponds to a state in which the receiving platform 5 is being stored. The fourth level corresponds to, for example, a case where the lift switch Sw11 of the load receiving table operation switch is turned on while the wings Wa and Wb are being closed. The fifth level corresponds to the case where the lowering switch Sw12 of the load receiving table operation switch is turned on while the wings Wa and Wb are closed, for example.

  The sixth step corresponds to the case where the load receiving platform 5 is raised in the load receiving platform lifting device (S13 of the control flow), and the seventh step corresponds to the case where the load receiving platform 5 is lowered (S16 of the control flow). doing. The eighth level corresponds to the case where the receiving platform 5 is stored (S12 of the control flow), and the seventh level corresponds to the case where the same is pulled out (S17 of the control flow).

  As mentioned above, although one embodiment was taken up and explained per the present invention, the present invention is not limited to the above-mentioned embodiment. For example, in the present embodiment, the relay R prohibits the roof opening / closing device from operating during the operation of the cargo receiving platform lifting device, but conversely, the relay R is connected to the power supply and the solenoid valves AD (SoA to SoD). It may be prohibited to operate the load receiving platform lifting / lowering device during the operation of the roof opening / closing device by configuring so that energization can be permitted or prohibited.

  Moreover, in this embodiment, although the relay R interrupts | blocks the electric current which excites solenoid valves 1-5 (So1-So5) collectively about all the solenoid valves, it is not limited to this, For example, relay R is " Only the solenoid valve 5 (So5) which is the “original valve” may be shut off.

  In this embodiment, the subunit SU includes the relay R, but the relay R may be provided separately from the subunit SU.

  Further, the relay R of the present embodiment is arranged so that energization can be permitted or prohibited between the power source (on-vehicle battery) and the solenoid valves 1 to 5 (So1 to So5). Although it is comprised so that the electric current which excites 1-5 (So1-So5) can be interrupted | blocked, it is not restricted to this. For example, when a current for exciting the solenoid valves 1 to 5 (So1 to So5) is supplied from the subunit-side control unit SC, energization is performed between the power source (vehicle-mounted battery) and the subunit-side control unit SC. It arrange | positions so that it can accept | permit or prohibit, and the electric current which excites solenoid valves 1-5 (So1-So5) indirectly may be interrupted | blocked. For example, when supplying the current which excites solenoid valves 1-5 (So1-So5) from roof operation switches Sw21 and Sw22, between a power supply (vehicle-mounted battery) and roof operation switches Sw21 and Sw22, It is arrange | positioned so that electricity supply may be permitted or prohibited, and the electric current which excites solenoid valve 1-5 (So1-So5) indirectly may be interrupted | blocked.

  In this embodiment, the solenoid valve 1 (So1) and the solenoid valve 2 (So2) constitute one three-position valve, and the solenoid valve 3 (So3) and the solenoid valve 4 (So4) constitute one three-position valve. Although configured, each solenoid valve may be a two-position valve. The two-position valve may be configured to shut off the hydraulic circuit in the non-excited state and communicate the hydraulic circuit in the excited state.

  In the control flow, the main unit control unit MC determines the presence / absence of the roof opening / closing signal Sig1 (S2). For example, when the detection unit SS1 is omitted, an activation request is issued instead of the roof opening / closing signal Sig1. The presence or absence of the signal Sig2 may be determined. Further, the driving of the load receiving actuator may be detected from the presence / absence of an operation input of the load receiving operation switch.

  Further, a single power unit in which the main unit and the subunit are integrated may be used. On the contrary, the roof opening and closing device and the load receiving platform lifting device may have separate hydraulic circuits independent from each other as in the prior art, and there may be separate power units.

  In addition, the configuration of the roof opening / closing device and the opening / closing operation of each wing Wa, Wb, and the configuration of the load receiving platform lifting / lowering device and the storing operation, the drawing operation, and the lifting operation of the load receiving platform 5 are not limited to the aspects of this embodiment. The present invention can be implemented in various modes. For example, in this embodiment, the load receiving platform elevating device is retractable under the floor, and as shown in FIG. 2, the storage position of the load receiving stand 5 is the rear lower part of the load box B. However, the present invention is not limited to this. An aspect (rear retractable type) in which the cargo receiving platform 5 is raised and stored at the rear end may be employed.

  Moreover, although this embodiment demonstrated the case where a lorry was provided with 2 types of drive devices, a cargo receiving platform raising / lowering device and a roof opening / closing device, you may provide 3 or more types of drive devices. In this case, the number of energization prohibiting units corresponding to the number of drive devices may be provided, and if one drive device is being driven, the other energization prohibiting units may be controlled to prohibit energization.

5 Cargo stand B Cargo box Wa Roof (right wing)
Wb roof (left wing)
MU power unit (main unit)
SU power unit (sub unit)
31 Actuator for loading platform (slide cylinder)
44 Actuator for cargo cradle (lift cylinder)
WS1 Actuator for different types of drive, Actuator for roof (open / close cylinder)
WS2 Actuator for different types of drive, Actuator for roof (open / close cylinder)
R Energization prohibition part (relay)
MC control unit (main unit side control unit)
SC controller (sub-unit side controller)
SoA ~ D Open / close valve (Main unit solenoid valve)
So1-5 Open / close valve (subunit solenoid valve)

Claims (6)

A load receiving platform lifting device for operating a load receiving platform for loading and unloading the load, and a roof opening and closing device for opening and closing the roof of the load box for storing the load,
The load receiving platform lifting device and the roof opening and closing device can be operated separately and independently,
A power unit for supplying hydraulic oil for operating the load receiving platform elevating device and the roof opening and closing device;
A part of the load receiving and lowering device, and an actuator for a load receiving stand that is operated by operating oil supplied from the power unit via a plurality of solenoid valves;
A roof actuator that opens and closes the roof by supplying hydraulic oil from the power unit via a plurality of solenoid valves in a part of the roof opening and closing device;
Each of the plurality of solenoid valves is provided with respect to a current supplied from a power source to drive the plurality of solenoid valves that are provided corresponding to at least one of the actuators and supply hydraulic oil to the at least one actuator. An energization prohibition unit that can prohibit energization all at once, or an energization prohibition unit that can prohibit energization of a solenoid valve as a main valve located on the most upstream side of the hydraulic circuit among the plurality of solenoid valves,
A control unit that controls each of the plurality of solenoid valves, and when there is an actuator being driven among the actuators, the energization prohibiting unit corresponds to an actuator that is not driven among the actuators. And a control unit that controls the energization prohibiting unit provided to prohibit energization. A main unit side control unit for operating a plurality of solenoid valves for opening and closing the flow path of the hydraulic oil supplied to the load receiving actuator;
A sub-unit-side control unit that is connected to the main-unit-side control unit and operates a plurality of solenoid valves that open and close a flow path of hydraulic oil supplied to the roof actuator;
Of the main unit side control unit and the sub unit side control unit, when supplying hydraulic oil to the driving actuator, a plurality of solenoid valves that open and close the flow path of the hydraulic oil supplied to the actuator are operated. The hydraulic mechanism for a cargo vehicle according to claim 1, wherein the control unit that is not applied corresponds to a control unit that performs control so as to prohibit energization of the energization prohibition unit. An open / close valve that allows or prohibits the supply of hydraulic oil to each actuator;
The on-off valve blocks the flow of hydraulic fluid corresponding to the actuator that is not the drive target by prohibiting the energization of the energization prohibiting unit, and prohibits the supply of hydraulic oil to the actuator that is not the drive target. The hydraulic mechanism for a truck according to claim 1 or 2.   The hydraulic mechanism for a truck according to claim 3, wherein the on-off valve is a solenoid valve that shuts off a flow path of the hydraulic oil when de-energized.   The hydraulic mechanism for a lorry according to any one of claims 1 to 4, wherein the energization prohibition unit is a relay that prohibits the energization when a contact is opened by excitation. A load receiving table lifting device for operating a load receiving table for loading and unloading a load by a hydraulically driven load receiving actuator;
A roof opening and closing device for opening and closing the roof of the packing box for storing luggage by a hydraulically driven roof actuator;
All of the plurality of solenoid valves are provided for a current supplied from a power source to drive a plurality of solenoid valves provided corresponding to at least one of the actuators and supplying hydraulic oil to the at least one actuator. In a lorry equipped with an energization prohibiting section capable of prohibiting energization all at once or energizing a solenoid valve as a main valve located on the most upstream side of the hydraulic circuit among the plurality of solenoid valves. It is a hydraulic mechanism for the load receiving table lifting device used for,
The load receiving platform lifting device and the roof opening and closing device can be operated separately and independently,
The consignment,
A support mechanism for supporting the load receiving table so as to be movable up and down;
The load receiving actuator;
A power unit for supplying hydraulic oil for operating the load receiving lift and the roof opening and closing device;
A control unit that controls each of the plurality of solenoid valves, and when there is an actuator being driven among the actuators, the energization prohibiting unit corresponds to an actuator that is not driven among the actuators. And a control unit that controls the energization prohibiting unit provided so as to prohibit energization.

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