JP2015054548A - Wing door switchgear of wing vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wing door switchgear of a wing vehicle which can simplify an oil-hydraulic circuit.SOLUTION: A wing door switchgear 10 of a wing vehicle 1 comprises a single-acting fluid pressure cylinder 11 that elongates with a working fluid supplied from a fluid pressure pump 12 to drive a wing door 3 in the opening direction and contracts under a dead weight of the wing door 3 to discharge the working fluid, a supply passage 14 that supplies the working fluid from the fluid pressure pump 12 to the fluid pressure cylinder 11, a drain passage 15 that branches from the supply passage 14 to drain the working fluid discharged from the fluid pressure cylinder 11, a supply passage switching valve 19 that switches the cutoff and opening of the supply passage 14, and a controller 22 that operates the wing door 3 to open and close by controlling the operation state of the fluid pressure pump 12 and the switching state of the supply passage switching valve 19.

Description

  The present invention relates to a wing door opening / closing device for a wing vehicle.

  Patent Document 1 discloses a wing vehicle for freight transportation that employs a wing body. The wing body is provided with a pair of openable wing doors arranged on the left and right sides of the truck bed. Each wing door is composed of an L-shaped panel in which a top panel and a side panel are integrated, and is pivotally supported by a hinge disposed on a center line extending in the front-rear direction on the roof of the cargo bed. Each wing door is driven by a hydraulic cylinder, opens as the hydraulic cylinder extends, and closes as the hydraulic cylinder contracts.

JP 2008-238877 A

  In the conventional technique, the wing door is driven using a double-acting hydraulic cylinder, so that the hydraulic circuit becomes complicated.

  The present invention has been made in view of such a technical problem, and an object thereof is to provide a wing door opening / closing device for a wing vehicle capable of simplifying a hydraulic circuit.

  The present invention is a wing door opening and closing device for a wing vehicle having a wing door that opens and closes by rotating around a rotation shaft, and is extended by a working fluid supplied from a fluid pressure pump. A single-acting fluid pressure cylinder that is driven in the opening direction and contracts by the weight of the wing door to discharge the working fluid, a supply passage that supplies the working fluid from the fluid pressure pump to the fluid pressure cylinder, and a branch from the supply passage The drain passage for draining the working fluid discharged from the fluid pressure cylinder, the supply passage switching valve for switching between shut-off and opening of the supply passage, and the operating state of the fluid pressure pump and the switching state of the supply passage switching valve are controlled. And a controller that opens and closes the wing door.

  According to the present invention, since the wing door of the wing vehicle is driven using the single-acting fluid pressure cylinder, the fluid pressure circuit for driving the fluid pressure cylinder can be simplified.

It is a block diagram which shows the wing vehicle carrying the wing door opening / closing apparatus which concerns on embodiment of this invention. It is a circuit diagram showing a wing door opening and closing device of a wing vehicle according to an embodiment of the present invention. It is a simplified view showing a state where the wing door is closed. It is a simplified diagram showing a state where the wing door is open. It is a simplified diagram which shows the state by which the wing door is hold | maintained at the stop state.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram showing a wing vehicle 1 equipped with a wing door opening / closing device 10 according to the present embodiment.

  The wing vehicle 1 includes a cargo compartment 2 on which cargo is loaded, a pair of left and right wing doors 3 that cover the cargo compartment 2, and a wing door opening and closing device 10 (FIG. 2) that opens and closes the wing door 3.

  The wing door 3 is composed of an L-shaped panel in which a side panel 3 a that covers the side surface of the cargo compartment 2 and an upper panel 3 b that covers the upper surface of the cargo compartment 2 are integrated. Each wing door 3 is pivotally supported by a pivot shaft 4 extending back and forth in the center of the upper surface of the luggage compartment 2 and pivots up and down around the pivot shaft 4.

  When the wing door 3 is pivoted to the lowest position, the cargo compartment 2 is completely closed by the wing door 3, and when the wing door 3 is pivoted to the uppermost position, the cargo compartment 2 is completely opened to the left and right. Will be in the open state.

  The wing door opening / closing device 10 opens and closes each wing door 3 by an expansion / contraction operation of a hydraulic cylinder 11 as a fluid pressure cylinder. One hydraulic cylinder 11 is provided on each of the left and right upper portions of the front end and the rear end of the luggage compartment 2. The hydraulic cylinder 11 has a cylinder tube side end connected to the upper part of the cargo compartment 2, and a piston rod side end connected to the upper panel 3 b of the wing door 3.

  That is, the right wing door 3 is connected to two hydraulic cylinders 11 provided on the front and rear sides of the wing vehicle 1, and the left wing door 3 is connected to two hydraulic cylinders 11 provided on the left and front sides of the wing vehicle 1. .

  When the hydraulic cylinder 11 is extended, the wing door 3 rotates about the rotation shaft 4 and the cargo compartment 2 is opened. On the contrary, when the hydraulic cylinder 11 contracts, the wing door 3 rotates about the rotation shaft 4 and the cargo compartment 2 is closed.

  FIG. 2 is a circuit diagram showing the wing door opening / closing device 10. In FIG. 2, only the hydraulic cylinder 11 that supports one wing door 3 of the pair of wing doors 3 of the wing vehicle 1 is shown for simplification of description.

  The wing door opening / closing device 10 includes two hydraulic cylinders 11, a hydraulic pump 12 as a fluid pressure pump that generates hydraulic pressure, an electric motor 13 that drives the hydraulic pump 12, and hydraulic oil from the hydraulic pump 12 to the hydraulic cylinder 11. Supply passage 14 and a drain passage 15 that branches from the supply passage 14 and drains the hydraulic fluid discharged from the hydraulic cylinder 11.

  The hydraulic cylinder 11 is a single-acting hydraulic cylinder 11 that is extended by hydraulic oil supplied from the hydraulic pump 12 to rotate the wing door 3 upward, and the wing door 3 rotates downward by its own weight. The hydraulic oil is discharged by contracting.

  The supply passage 14 is a passage connecting the hydraulic pump 12 and the hydraulic cylinder 11 and branches into a fork at a branch point 14a. The hydraulic cylinders 11 are connected to the branched supply passages 14, respectively. As a result, the two hydraulic cylinders 11 are connected in parallel to the hydraulic pump 12.

  A check valve 16 that allows only the flow of hydraulic oil from the hydraulic pump 12 to the hydraulic cylinder 11 is interposed upstream of the branch point 14 a in the supply passage 14. Furthermore, a relief valve 17 that maintains the pressure in the supply passage 14 at a predetermined pressure or lower is connected to the supply passage 14 upstream of the check valve 16.

  The drain passage 15 branches from the supply passage 14 and guides the hydraulic oil discharged from the hydraulic cylinder 11 to the tank 18.

  The wing door opening / closing device 10 further includes a supply passage switching valve 19 interposed downstream of the branch point 14 a in the supply passage 14, a drain passage switching valve 20 interposed in the drain passage 15, and a rotation of the wing door 3. An electromagnetic brake 21 serving as a restraining mechanism for restraining movement and a controller 22 are provided.

  The supply passage switching valve 19 switches between blocking and opening of the supply passage 14 when the spool 19a moves in the axial direction. A solenoid 19b is provided at one axial end of the spool 19a, and a spring 19c is provided at the other axial end. The supply passage switching valve 19 is held at the shut-off position by the urging force of the spring 19c, and is switched to the communication position when the solenoid 19b is energized, and is switched to the shut-off position when the solenoid 19b is de-energized. At the communication position of the supply passage switching valve 19, the supply passage 14 is communicated via a throttle.

  The drain passage switching valve 20 switches between blocking and opening of the drain passage 15 when the spool 20a moves in the axial direction. A solenoid 20b is provided at one axial end of the spool 20a, and a spring 20c is provided at the other axial end. The drain passage switching valve 20 is held at the shut-off position by the urging force of the spring 20c, and is switched to the communication position when the solenoid 20b is in an excited state, and is switched to the cut-off position when the solenoid 20b is in a non-excited state.

  The electromagnetic brake 21 is attached to the rotation shaft 4 (FIG. 1) of the wing door 3 and stops the rotation of the wing door 3. When the electromagnetic brake 21 receives a supply of current from the controller 22 when a braking plate (not shown) is brought into sliding contact with the rotating shaft 4 by the biasing force of the spring to apply the braking force to the rotating shaft 4 and receives a current from the controller 22, the electromagnetic brake 21 As a result, the brake plate is separated from the rotating shaft 4 and the brake is released.

  The controller 22 receives the operation command from the operator and controls the supply passage switching valve 19, the drain passage switching valve 20, the electromagnetic brake 21, and the electric motor 13. An operation command from the operator is input to the controller 22 in accordance with, for example, an operation of an operation lever (not shown) provided in the wing vehicle 1.

  Next, the operation of the wing door opening / closing device 10 will be described.

  3A to 3C are diagrams schematically showing the loading platform portion of the wing vehicle 1. 3A to 3C show only the outer frame of the wing door 3, and omit the side panel 3a and the top panel 3b.

  First, as shown in FIG. 3A, a case will be described in which an operator's operation command for opening the wing door 3 is input in a state where the wing door 3 is completely closed and the luggage compartment 2 is closed.

  In this case, as shown in FIG. 2, the controller 22 energizes the electromagnetic brake 21 to drive the electric motor 13 to bring the solenoid 19 b of the supply passage switching valve 19 into an excited state. When the electromagnetic brake 21 is energized, the braking of the rotating shaft 4 is released. Since the supply passage 14 is opened and the drain passage 15 is shut off, the hydraulic oil driven by the electric motor 13 and supplied from the hydraulic pump 12 is guided to the hydraulic cylinder 11 through the supply passage 14.

  The hydraulic cylinder 11 extends upon receipt of the hydraulic oil, and rotates the wing door 3 upward. When the wing door 3 rotates to the top, the controller 22 releases the energization of the electromagnetic brake 21, stops the electric motor 13, and puts the solenoid 19b of the supply passage switching valve 19 into a non-excited state. Thereby, the wing door 3 changes to the open state shown to FIG. 3B.

  Next, as shown in FIG. 3B, a case will be described in which the operator's operation command for closing the wing door 3 is input in a state where the wing door 3 is completely open and the luggage compartment 2 is opened.

  In this case, as shown in FIG. 2, the controller 22 energizes the electromagnetic brake 21 and brings the solenoid 20 b of the supply passage switching valve 19 and the drain passage switching valve 20 into an excited state. When the electromagnetic brake 21 is energized, the braking of the rotating shaft 4 is released. Since the supply passage 14 and the drain passage 15 are opened, the hydraulic cylinder 11 contracts due to the weight of the wing door 3, and the hydraulic oil discharged from the hydraulic cylinder 11 is guided to the tank 18 through the drain passage 15. Since the check valve 16 is provided on the upstream side of the branch point 14a of the supply passage 14, the hydraulic oil discharged from the hydraulic cylinder 11 does not flow to the hydraulic pump 12 side.

  Since the hydraulic oil is discharged through the throttle of the supply passage switching valve 19, the hydraulic cylinder 11 contracts at a predetermined low speed and rotates the wing door 3 downward. When the wing door 3 rotates to the lowest position, the controller 22 releases the energization of the electromagnetic brake 21 and puts the solenoid 20b of the supply passage switching valve 19 and the drain passage switching valve 20 into a non-excited state. Thereby, the wing door 3 changes to the obstruction | occlusion state shown to FIG. 3A.

  Next, a case where the rotation of the wing door 3 is stopped halfway will be described.

  When the wing door 3 is rotated upward, when the rotation of the wing door 3 is stopped halfway, the controller 22 releases the energization of the electromagnetic brake 21 and stops the electric motor 13 to supply. The solenoid 19b of the passage switching valve 19 is brought into a non-excited state.

  When the wing door 3 is rotated downward, when the rotation of the wing door 3 is stopped halfway, the controller 22 releases the energization of the electromagnetic brake 21 and supplies the supply passage switching valve 19 and the drain passage. The solenoid 20b of the switching valve 20 is brought into a non-excited state.

  When the energization of the electromagnetic brake 21 is released, the rotating shaft 4 is stopped. When the solenoid 20b of the supply passage switching valve 19 and the drain passage switching valve 20 is de-energized, the supply passage 14 and the drain passage 15 are closed.

  Although the wing door 3 receives a force in the direction of rotating downward due to its own weight, the rotating shaft 4 is restrained by the electromagnetic brake 21, and thus the downward rotation of the wing door 3 is prevented. Even if the electromagnetic brake 21 does not operate, the supply passage switching valve 19 is shut off, so that the hydraulic cylinder 11 does not contract and the downward rotation of the wing door 3 is prevented. Further, even if the supply passage switching valve 19 is not shut off, the drain passage switching valve 20 is shut off and the check valve 16 is provided on the upstream side of the branching point 14a of the supply passage 14, so that the lower side of the wing door 3 is provided. Is prevented from rotating.

  Even if the wing door 3 is blown by wind or the like and receives a force in the direction of turning upward, the turning shaft 4 is restrained by the electromagnetic brake 21, so that the turning of the wing door 3 does not move upward. Is prevented.

  That is, the wing door opening / closing device 10 has a triple rotation prevention mechanism for the downward rotation in a state where the rotation of the wing door 3 is stopped halfway, and the upward rotation is possible. On the other hand, it has a single rotation prevention mechanism.

  As described above, the controller 22 can rotate the wing door 3 between the closed state and the open state, and can stop the rotation at an arbitrary position.

  According to the above embodiment, there exist the effects shown below.

  Since the wing door 3 of the wing vehicle 1 is driven using the single-acting hydraulic cylinder 11, the hydraulic circuit for driving the hydraulic cylinder 11 can be simplified. In particular, the pipe connecting the supply passage switching valve 19 and the hydraulic cylinder 11 is about half as long as the double-acting hydraulic cylinder 11 is used, so the hydraulic circuit can be reduced in size and cost can be reduced. can do.

  Furthermore, when the single-acting hydraulic cylinder 11 is used, when the wing door 3 is rotated downward, the wing door 3 is lowered by its own weight, so that it is not necessary to supply hydraulic oil to the hydraulic cylinder 11. Therefore, energy consumption required for the opening / closing operation of the wing door 3 can be suppressed.

  Furthermore, since the single-acting hydraulic cylinder 11 has higher strength than the double-acting hydraulic cylinder 11, the diameter of the hydraulic cylinder 11 can be reduced if the required strength is the same.

  Furthermore, since the three-position switching valve that is required when using the double-acting hydraulic cylinder 11 is not required, the cost of the switching valve can be reduced.

  Furthermore, since the pilot check valve required when using the double-acting hydraulic cylinder 11 is not required, the cost can be reduced accordingly.

  Further, since the drain passage 15 branches from between the check valve 16 and the supply passage switching valve 19 in the supply passage 14, the supply passage switching valve 19 and the drain passage switching are performed along a path through which hydraulic oil is drained from the hydraulic cylinder 11. The valve 20 is arranged in series. Therefore, when the rotation of the wing door 3 is stopped, the lowering of the wing door 3 can be more reliably prevented.

  Furthermore, since the electromagnetic brake 21 for stopping the rotation of the wing door 3 is provided, when the rotation of the wing door 3 is stopped, the wing door 3 is swung up by wind or the like in the direction of rotating upward. Even if force is received, the wing door 3 can be prevented from rotating. Further, the electromagnetic brake 21, the supply passage switching valve 19, the drain passage switching valve 20, and the check valve 16 can prevent the wing door 3 from being lowered in a triple manner, so that the wing door 3 can be prevented from lowering more reliably. can do.

  Further, since the electromagnetic brake 21 is used as a mechanism for stopping the rotation of the wing door 3, the wing door 3 cannot be controlled due to a failure of the wing door opening / closing device 10 and the energization to the electromagnetic brake 21 is interrupted. The rotation of the wing door 3 is stopped. Therefore, it is possible to prevent the wing door 3 from being lowered unintentionally and improve safety.

  The embodiment of the present invention has been described above. However, the above embodiment is merely one example of application of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  For example, in the above embodiment, the drain passage 15 is branched from the upstream side of the supply passage switching valve 19 in the supply passage 14, but may be branched from the downstream side of the supply passage switching valve 19. In this case, when lowering the wing door 3, the controller 22 energizes the electromagnetic brake 21, deenergizes the solenoid 19 b of the supply passage switching valve 19, and energizes the solenoid 20 b of the drain passage switching valve 20. do it. Further, the prevention of the lowering of the wing door 3 is doubled by the electromagnetic brake 21, the supply passage switching valve 19 and the drain passage switching valve 20.

  Furthermore, in the said embodiment, although the electromagnetic brake 21 is used as a mechanism which stops rotation of the wing door 3, you may use another brake mechanism.

  Further, in the above embodiment, when the rotation of the wing door 3 is stopped halfway, that is, when the operator's lever operation is stopped, the controller 22 releases the energization of the electromagnetic brake 21 and stops the rotation shaft 4. However, the controller 22 may perform control so as to release the energization of the electromagnetic brake 21 after a predetermined delay time after the lever operation by the operator is stopped. Thereby, generation | occurrence | production of the vibration by the wing door 3 in rotation stopping suddenly can be prevented.

  Furthermore, in the said embodiment, although the hydraulic cylinder 11 expanded and contracted by oil_pressure | hydraulic was illustrated, you may use the fluid pressure cylinder driven with fluids other than oil, such as water and a water-soluble alternative liquid.

DESCRIPTION OF SYMBOLS 1 Wing vehicle 3 Wing door 4 Rotating shaft 10 Wing door opening / closing device 11 Hydraulic cylinder (fluid pressure pump)
12 Hydraulic pump (fluid pressure pump)
14 Supply passage 15 Drain passage 16 Check valve 19 Supply passage switching valve 20 Drain passage switching valve 21 Electromagnetic brake (control mechanism)
22 Controller

Claims (5)

A wing door opening and closing device of a wing vehicle having a wing door that opens and closes by rotating about a rotation axis,
A single-acting fluid pressure cylinder that extends by a working fluid supplied from a fluid pressure pump to drive the wing door in the opening direction and contracts by its own weight to discharge the working fluid;
A supply passage for supplying a working fluid from the fluid pressure pump to the fluid pressure cylinder;
A drain passage for draining the working fluid branched from the supply passage and discharged from the fluid pressure cylinder;
A supply passage switching valve for switching between blocking and opening of the supply passage;
A controller that opens and closes the wing door by controlling an operating state of the fluid pressure pump and a switching state of the supply passage switching valve;
A wing door opening and closing device for a wing vehicle, comprising: A check valve interposed between the fluid pressure pump and the supply passage switching valve in the supply passage and allowing only a flow from the fluid pressure pump to the supply passage switching valve;
A drain passage switching valve for switching between blocking and opening the drain passage;
Further comprising
The drain passage is branched from between the check valve and the supply passage switching valve in the supply passage,
The controller shuts off the supply passage and the drain passage when holding the wing door in a stopped state, and opens the supply passage by operating the fluid pressure pump to open the drain passage when opening the wing door. When closing the passage and closing the wing door, the fluid pressure pump is stopped to open the supply passage and the drain passage.
The wing door opening and closing device for a wing vehicle according to claim 1. Further comprising a restraining mechanism capable of restraining the rotation of the wing door;
When the controller holds the wing door in a stopped state, the controller controls the stopping mechanism to stop the rotation of the wing door.
The wing door opening and closing device for a wing vehicle according to claim 1 or 2, wherein the wing door opening and closing device is provided. The stopping mechanism is an electromagnetic brake that stops the rotation of the rotating shaft according to the interruption of the supply current.
The wing door opening and closing device for a wing vehicle according to claim 3. When the controller holds the wing door in a stopped state, the controller controls the stop mechanism after a preset delay time to stop the rotation of the wing door.
The wing door opening and closing device for a wing vehicle according to claim 3 or 4, wherein the wing door opening and closing device is provided.