JP2019064778A - Ramp device - Google Patents

Abstract

To provide a ramp device capable of adjusting tilting of a ramp.SOLUTION: This ramp device is provided with: a first hydraulic cylinder 11 that lifts the front right side of a ramp; a second hydraulic cylinder 12 that lifts a front left side; a third hydraulic cylinder 13 that lifts a rear left side; a fourth hydraulic cylinder 14 that lifts a rear right side; front and rear hydraulic units 20A, 20B that constitute a hydraulic device 20; and a remote controller 30. The hydraulic units 20A, 20B have a hydraulic oil inlet P directly connected to the hydraulic oil outlet of a pump 22, cylinder connection ports A1, A2, A3, and B1 connected to the hydraulic cylinders 11-14, a valve block 24 having a hydraulic oil return port T for returning hydraulic oil to an oil tank 21, electromagnetic switching valves 41-43 integrally provided to the valve block 24, etc.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a lifting and lowering mechanism for lifting and lowering a lifting and lowering mechanism by a hydraulic cylinder, and more particularly to a lifting and lowering mechanism capable of adjusting the tilt of the lifting and lowering mechanism.

  2. Description of the Related Art Conventionally, a removable body has been proposed in which a body for carrying cargo or the like is separated from a loading space of a vehicle and made to stand. In this case, the strokes of the hydraulic cylinders provided on the body are generally not finely adjusted individually, and the separation of the body is usually performed on a substantially horizontal ground.

  By the way, also in the lifting platform apparatus which transfers by a vehicle, it may use separately from a vehicle loading platform. In this case, depending on the application, it may be used on slopes, and a function capable of maintaining the leveling platform even on slopes is required.

  The present invention has been made in recognition of such a situation, and an object thereof is to provide a lift platform device capable of adjusting the tilt of the lift platform.

One embodiment of the present invention is a lift platform device. This elevator unit is
Lifting platform,
A first hydraulic cylinder that raises and lowers the front left side of the elevator platform;
A second hydraulic cylinder that raises and lowers the front right side of the lifting platform;
A third hydraulic cylinder that raises and lowers the rear left side of the lifting platform;
A fourth hydraulic cylinder that raises and lowers a rear right side of the elevator platform;
A hydraulic device installed on the elevator and driving each hydraulic cylinder,
An operating unit connected to the hydraulic device;
The hydraulic device includes an oil tank, a pump that sucks up and discharges hydraulic oil in the oil tank, and an electric motor that drives the pump.
A valve block having a hydraulic oil inlet port connected to a hydraulic oil outlet of the pump, a cylinder connection port connected to the hydraulic cylinder, and a hydraulic oil return port for returning hydraulic oil to an oil tank;
A solenoid valve integrally provided in the valve block;
An operation of operating the solenoid valve to simultaneously extend and retract the first to fourth hydraulic cylinders by a switch operation of the operation unit, and an operation of extending or retracting any one of the first to fourth hydraulic cylinders Is possible.

The hydraulic device includes a front hydraulic unit and a rear hydraulic unit, and the front hydraulic unit simultaneously extends and retracts the first and second hydraulic cylinders, and either the first or second hydraulic cylinder It is possible to operate to selectively extend or
The rear hydraulic unit may be configured to be capable of simultaneously expanding and contracting the third and fourth hydraulic cylinders and selectively expanding and contracting any of the third and fourth hydraulic cylinders.

  The hydraulic fluid discharge port of the pump may be directly connected to the hydraulic fluid inlet port of the valve block.

  The elevator platform has beams which can be extended in the left and right direction respectively on the left and right of the front and the left and right of the rear, and the first to fourth hydraulic cylinders are respectively attached to the end of the beam Good.

  It is to be noted that arbitrary combinations of the above-described components, and those obtained by converting the expression of the present invention among methods, systems, and the like are also effective as aspects of the present invention.

  According to the elevator table device according to the present invention, the operation of simultaneously expanding and contracting the hydraulic cylinders in front and rear and the left and right of the elevator table and the operation of selectively expanding and contracting a specific hydraulic cylinder can be performed. It is. Therefore, for example, even when the elevator apparatus is disposed on an inclined surface (an inclined road or the like), the inclination and posture of the elevator can be corrected, and the elevator can be maintained horizontally.

BRIEF DESCRIPTION OF THE DRAWINGS It is embodiment of the lift board apparatus which concerns on this invention, Comprising: (A) is a schematic plan view which shows the state by which the lift board apparatus was mounted on the loading platform of a conveyance vehicle, and being fastened, (B) is an operation part. The top view which shows a remote controller. The side view which shows the state by which the elevation board apparatus was fastened on the loading platform of a conveyance vehicle in embodiment. Similarly, the side view which shows the state which isolate | separated the lift platform apparatus on the loading platform of a transport vehicle. Similarly, the side view which shows the case where a conveyance vehicle is advanced and retracted | saved with respect to the stand apparatus which stood up independently. The side view of the elevator platform apparatus in embodiment. Same front view. Same back view. The hydraulic circuit diagram of the hydraulic system in embodiment. The front view which shows the structure of the front and back hydraulic unit of the said hydraulic system. The same plan view. The front view which shows the structure of the valve block with which the electromagnetic switching valve etc. in the said hydraulic unit were integrated. The same side view.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component shown by each drawing, a member, a process, etc., and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention, and are merely examples, and all the features described in the embodiments and the combination thereof are not necessarily essential to the invention.

  FIG. 1 shows an embodiment of a lift platform apparatus according to the present invention, wherein (A) is a schematic plan view showing a state where the lift platform apparatus 10 is mounted on a loading platform 2 of the transport car 1 and fastened; 2 is a plan view showing the remote controller 30 as the operation unit, FIG. 2 is a side view showing a state in which the lift platform device 10 is mounted on the loading platform 2 of the transport vehicle 1 and fastened, FIG. FIG. 4 is a side view showing the case where the transport car 1 is moved forward and backward with respect to the self-supporting lift device 10. As shown in FIG. 5 is a side view of the lift table device 10, FIG. 6 is a front view thereof, FIG. 7 is a rear view thereof, FIG. 8 is a hydraulic circuit diagram of the hydraulic device 20, and FIG. 10 is a plan view showing the structure of the units 20A and 20B, FIG. 11 is a front view showing the structure of a valve block integrating electromagnetic switching valves in the hydraulic units 20A and 20B, and FIG. FIG.

  As shown in these figures, the lifting and lowering stand device 10 is a lifting and lowering stand 15 (may be box-like having a side wall and a ceiling, may be plate-like or frame-like), Hydraulic cylinder 11 for raising and lowering the front right side of the lifting platform 15 in the direction, the second hydraulic cylinder 12 for lifting and lowering the front left side of the lifting platform 15, and third hydraulic pressure for lifting the rear left side of the lifting platform 15 Remote controller as an operation unit having a cylinder 13, a fourth hydraulic cylinder 14 for raising and lowering the rear right side of the lift platform 15, an hydraulic device 20 capable of raising and lowering each of the hydraulic cylinders 11 to 14 independently, and an operation switch group It has 30 and. The hydraulic cylinders 11 to 14 function as jacks. The remote controller 30 is connected by wire (or wirelessly) to a control board 25 in which the electric control system of the hydraulic device 20 is housed.

  As shown in FIGS. 6 and 7, the elevator platform 15 has beams 16 which can be extended in the left and right direction on the left and right of the front and the left and right of the rear, respectively, and the first to fourth hydraulic cylinders 11 to 14 have Each is attached to the end of the beam 16. The beam 16 is supported slidably (extractable and retractable) in the left-right direction (lateral direction) by a rectangular pipe-shaped frame 17 integrally formed by the elevator platform 15. As shown in FIG. 2, the lifting and lowering platform device 10 is mounted and fastened on the bed 2 of the transport vehicle 1 and the piston rods 11 a to 11 of the first to fourth hydraulic cylinders 11 to 14 are pulled out and stored. It can be performed in a state in which 14a is contracted. As a mechanism for fastening and releasing the lift platform device 10 to the loading platform 2, a known container fastening mechanism or the like can be used. The beam 16 can be fixed to the pipe-like frame 17 by means of bolts in a multistage withdrawal position.

  The hydraulic device 20 includes a front hydraulic unit 20A installed at the front of the elevator 15 as shown in FIG. 6, a rear hydraulic unit 20B installed at the rear of the elevator 15 as shown in FIG. And a control panel 25 housing an electric control system for controlling the control units 20A and 20B. The control board 25 is disposed adjacent to the rear hydraulic unit 20B.

  As shown in FIG. 8, the front hydraulic unit 20A and the rear hydraulic unit 20B have the same hydraulic circuit configuration, and the front hydraulic unit 20A operates to extend and retract the first and second hydraulic cylinders 11, 12 simultaneously. It is possible to selectively extend and retract either the first or second hydraulic cylinders 11 and 12. The rear hydraulic unit 20B is capable of simultaneously expanding and contracting the third and fourth hydraulic cylinders 13 and 14, and selectively expanding and contracting either the third or fourth hydraulic cylinders 13 or 14. The first to fourth hydraulic cylinders 11 to 14 are double acting hydraulic cylinders.

  As shown in FIGS. 8 to 10, each of the hydraulic units 20A and 20B includes an oil tank 21 fixed on the lifting platform 15, a hydraulic pump 22 for sucking up and discharging the hydraulic oil in the oil tank 21, and a pump It has the electric motor 23 to drive, and the valve block 24 by which electromagnetic switching valve 41,42,43, the relief valve 45 grade | etc., Were integrally provided like FIG.11 and FIG.12. The valve block 24 has a hydraulic fluid inlet port P to which hydraulic fluid discharge ports of the pump 22 are connected (directly connected by screwing), and cylinder connection ports A1, A2, A3, etc. connected to hydraulic cylinders B1, the hydraulic oil return side port T for returning the hydraulic oil to the oil tank 21 is provided. As shown in FIG. 11, the spools (valve bodies) 41a, 42a, 43a of the solenoid control valves 41, 42, 43 and the spool (valve body) 45a of the relief valve 45 are required in the hydraulic fluid path formed in the valve block 24. It is movably provided to perform the function of The relief valve 45 functions as a safety valve that opens when the discharge side of the pump 22 exceeds a certain pressure to return the hydraulic oil into the oil tank 21.

  In the case of the front hydraulic unit 20A, the cylinder connection port A1 is connected to the first hydraulic cylinder 11 (extension side port) via the pilot check valve 51, and the cylinder connection port A3 is connected to the second hydraulic cylinder 12 (pilot switch 52). Each is connected to the expansion side port). The cylinder connection port A2 is connected to the first hydraulic cylinder 11 (extension side port) via the tuning valve 55 that equally distributes the hydraulic oil, the solenoid on-off valve 61, and the pilot check valve 51. It is connected to the second hydraulic cylinder 12 (extension side port) via the on-off valve 62 and the pilot check valve 52. The cylinder connection port B1 is connected to the first and second hydraulic cylinders 11 and 12 (contraction side ports) via pilot check valves 51 and 52.

  In the case of the rear hydraulic unit 20B, the cylinder connection port A1 is connected to the third hydraulic cylinder 13 (extension side port) via the pilot check valve 53, and the cylinder connection port A3 is connected to the fourth hydraulic cylinder 14 (extension Connected to each side port). The cylinder connection port A2 is connected to the third hydraulic cylinder 13 (extension side port) via the tuning valve 56 for equally distributing the hydraulic oil, the solenoid on-off valve 63 and the pilot check valve 53, and the tuning valve 56 and the solenoid valve It is connected to the fourth hydraulic cylinder 14 (extension side port) via the on-off valve 64 and the pilot check valve 54. The cylinder connection port B1 is connected to the third and fourth hydraulic cylinders 13, 14 (contraction side ports) via pilot check valves 53, 54.

  The cooperation between the front hydraulic unit 20A and the rear hydraulic unit 20B controls the rotational speed of the motor 23 controlled by the inverter 28A of the hydraulic unit 20A to the same value as the rotational speed of the motor 23 controlled by the inverter 28B of the hydraulic unit 20B. It can be done by doing. Although illustration is omitted, an alternating current or direct current power supply is connected to the inverters 28A and 28B.

  As shown in FIG. 1 (B), the remote controller 30 as the operation unit includes a hydraulic pump "ON" switch 51, a hydraulic pump "OFF" switch 52, a jack "out" switch 53, a jack "on" switch 54, No .1 jack selection switch 61, No. 2 jack selection switch 62, No. 3 jack selection switch 63, No. 4 jack selection switch 64, and a pump operation indicator light 65.

  Hereinafter, the operation of the elevator apparatus 10 according to the present embodiment will be described.

  As shown in FIG. 1A and FIG. 2, a state where the elevator apparatus 10 is mounted on the bed 2 of the transport vehicle 1 and fastened (the piston rods 11 a to 14 a of the first to fourth hydraulic cylinders 11 to 14 are In the retracted state, the lifting and lowering stand device 10 can be transported by the transport car 1 to any place. Further, with the fastening of the lift platform device 10 to the loading platform 2 removed, as shown in FIG. 3, the lift platform device 10 can be loaded by extending the piston rods 11 a to 14 a of the first to fourth hydraulic cylinders 11 to 14. The carriage 1 can be moved to the separated position as shown in FIG. 4 after being in the freestanding state lifted from 2 and thereafter, the lifting and lowering operation of the lifting and lowering stand 15 can be performed by the lifting and lowering stand device 10 alone.

  In the remote controller 30 of FIG. 1B, when the button of the hydraulic pump “ON” switch 51 is pressed, the motors 23 of the hydraulic units 20A and 20B of the hydraulic device 20 start to rotate, and the hydraulic pump 22 starts. The pump operation indicator light 65 is turned on. When the hydraulic pump “OFF” switch 52 is pressed, the energization of the motor 23 of each hydraulic unit 20A, 20B is cut off, and the hydraulic pump 22 is stopped.

  In the start-up state of the hydraulic pump 22 of each hydraulic unit 20A, 20B, when the button of the jack "out" switch 53 is pressed, the electromagnetic switching valve 41, 43 of FIG. 8 is closed and the electromagnetic switching valve 42 where the solenoid 42a is excited is closed. The hydraulic fluid is sent out from the cylinder connection port A2 through one path of the electromagnetic switching valve 42, and the hydraulic fluid is divided by the tuning valve 55 in the hydraulic unit 20A by the tuning valve 55. And the second hydraulic cylinder 11, 12 and, at the hydraulic unit 20B, the hydraulic oil is divided into two by the tuning valve 56, and is added to the third and fourth hydraulic cylinders 13, 14 through the open solenoid valves 63, 64. , And the first to fourth hydraulic cylinders 11 to 14 as jacks are extended synchronously, and the lifting platform 15 is raised (the respective hydraulic cylinders 11 to 14 The discharged hydraulic oil is returned to the oil tank 21 through the other path of the electromagnetic switching valve 42). When the pressing of the button of the jack "out" switch 53 is stopped, the electromagnetic on / off valves 61 to 64 are closed, and the extension states of the cylinders 11 to 14 are maintained.

  When the button of the jack "on" switch 54 is pressed, the electromagnetic switching valves 41 and 43 are closed, the electromagnetic switching valve 42 where the solenoid 42b is excited is opened, and operation is made from the cylinder connection port B1 through one path of the electromagnetic switching valve 42 The oil is delivered, and the first and second hydraulic cylinders 11, 12 contract in the hydraulic unit 20A, and the third and fourth hydraulic cylinders 13, 14 contract in the hydraulic unit 20B. At this time, since the hydraulic oil is equally returned from the first to fourth hydraulic cylinders 11 to 14 by the tuning valves 55 and 56 of the hydraulic oil return path, the first to fourth hydraulic cylinders 11 to 14 contract synchronously. The lift platform 15 is lowered (the hydraulic fluid discharged from the hydraulic cylinders 11 to 14 returns to the oil tank 21 through the other path of the electromagnetic switching valve 42). When pressing of the button of the jack "on" switch 54 is stopped, the solenoid on / off valves 61 to 64 are closed, and the contracted state of the cylinders 11 to 14 is maintained. In this manner, the entire elevator 15 can be raised and lowered.

  Furthermore, while pushing any one of the No. 1 jack selection switch 61, the No. 2 jack selection switch 62, the No. 3 jack selection switch 63, and the No. 4 jack selection switch 64, When the button is pressed, one of the first to fourth hydraulic cylinders 11 to 14 selected by any one of the jack selection switches 61 to 64 is extended, and one of the front, rear, left, and right ends of the elevator platform 15 is expanded. One end rises. For example, when the No. 1 jack selection switch 61 and the button of the jack "out" switch 53 are pressed, the electromagnetic switching valves 42 and 43 of the front hydraulic unit 20A are closed, the solenoid 41a is excited, and the electromagnetic switching valve 41 is The hydraulic fluid is sent out from the cylinder connection port A1 through one path of the electromagnetic switching valve 41, the first hydraulic cylinder 11 is extended, and the front right end of the lifting platform 15 is raised (the operation discharged from the hydraulic cylinder 11 The oil returns to the oil tank 21 through the other path of the electromagnetic switching valve 41).

  In addition, while pressing any one of the No. 1 jack selection switch 61, the No. 2 jack selection switch 62, the No. 3 jack selection switch 63, and the No. 4 jack selection switch 64 of the jack “on” switch 54 When the button is pressed, one of the first to fourth hydraulic cylinders 11 to 14 selected by any one of the jack selection switches 61 to 64 is contracted, and the front, rear, left, and right ends of the lifting platform 15 One end of the descent. For example, when the No. 4 jack selection switch 64 and the button of the jack "on" switch 54 are pressed, the electromagnetic switching valves 41 and 42 of the rear hydraulic unit 20B are closed, the solenoid 43b is excited, and the electromagnetic switching valve 43 is opened. The hydraulic fluid is delivered from the cylinder connection port B1 through one path of the solenoid switching valve 43, the fourth hydraulic cylinder 14 is contracted, and the rear right end of the lift 15 descends (discharged from the hydraulic cylinder 14 The hydraulic oil returns to the oil tank 21 through the other path of the solenoid control valve 43).

  Thus, by using the jack selection switches 61 to 64, one end of the front, rear, left and right ends of the elevator 15 can be selectively elevated and lowered, and the elevator device 10 is disposed on an inclined surface (for example, an inclined road) Even in the case, the tilt and attitude of the lift 15 can be corrected, and for example, the lift 15 can be maintained horizontal.

  According to the present embodiment, the following effects can be achieved.

(1) An operation of simultaneously expanding and contracting the front and rear hydraulic cylinders 11 to 14 of the elevator platform 15 and an operation of selectively expanding and contracting a specific hydraulic cylinder are possible, and the inclination adjustment of the elevator platform 15 is possible. Therefore, for example, even when the lifting and lowering stand device 10 is disposed on a slope (an inclined road and the like), the tilt and posture of the lifting and lowering stand 15 can be corrected, and the lifting and lowering stand 15 can be maintained horizontally. .

(2) The hydraulic circuit of the hydraulic device 20 uses the valve block 24 in which the solenoid control valves 41, 42, 43, the relief valve 45, etc. are integrally provided, and the spool of the solenoid control valves 41, 42, 43 Since the (valve body) 41a, 42a, 43a and the spool (valve body) 45a of the relief valve 45 are movably provided in the hydraulic fluid path formed in the valve block 24 so as to perform a required function, The hydraulic circuit can be compact and robust.

(3) The hydraulic device 20 has a front hydraulic unit 20A and a rear hydraulic unit 20B, and the front hydraulic unit 20A simultaneously extends and retracts the first and second hydraulic cylinders 11, 12 on the front side, the first or An operation for selectively expanding and contracting any of the second hydraulic cylinders 11 and 12, and an operation for simultaneously expanding and contracting the rear third and fourth hydraulic cylinders 13 and 14 by the rear hydraulic unit 20B; An operation of selectively expanding and contracting any of the fourth hydraulic cylinders 13 and 14 is performed, and the hydraulic piping to each hydraulic cylinder can be shortened.

(4) As shown in FIG. 9, since the hydraulic oil discharge port of the hydraulic pump 22 is directly connected to the hydraulic oil inlet port P of the valve block 24, the hydraulic piping can be reduced, and the device can be made compact and robust in this respect as well. Is possible.

(5) The lifting platform 15 has beams 16 which can be extended in the left-right direction respectively on the left, right and rear of the front and rear of the lifting platform 15. The first to fourth hydraulic cylinders 11 to 14 are end portions of the beam 16 Since it is attached to each, the position of the 1st-4th hydraulic cylinders 11-14 can be changed according to the condition of the ground or a road.

  Although the present invention has been described above by taking the embodiment as an example, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. It is a place. The following describes the modification.

  In the above embodiment, the hydraulic device 20 has the front hydraulic unit 20A and the rear hydraulic unit 20B, the front two hydraulic cylinders are driven by the front hydraulic unit 20A, and the rear two hydraulic cylinders are rear Although driven by the hydraulic unit 20B, a configuration is also possible in which all four cylinders 11 to 14 are driven by one hydraulic pump and one hydraulic circuit connected thereto.

DESCRIPTION OF SYMBOLS 1 Transport vehicle 2 loading platform 10 Lifting platform device 11-14 Hydraulic cylinder 15 Lifting platform 16 Beam 20 Hydraulic device 20A, 20B Hydraulic unit 21 Oil tank 22 Hydraulic pump 23 Motor 24 Valve block 25 Control panel 30 Remote controller 41-43 Electromagnetic switching valve 45 relief valve 51 hydraulic pump "ON" switch 52 hydraulic pump "OFF" switch 53 jack "out" switch 54 jack "on" switch 61 No. 1 jack selection switch 62 No. 2 jack selection switch 63 No. 3 jack selection switch 64 No. 4 jack selection switch 65 Pump operation indicator lights A1, A2, A3, B1 Cylinder connection port P Hydraulic oil inlet port T Hydraulic oil return port

Claims (4)

Lifting platform,
A first hydraulic cylinder that raises and lowers the front left side of the elevator platform;
A second hydraulic cylinder that raises and lowers the front right side of the lifting platform;
A third hydraulic cylinder that raises and lowers the rear left side of the lifting platform;
A fourth hydraulic cylinder that raises and lowers a rear right side of the elevator platform;
A hydraulic device installed on the elevator and driving each hydraulic cylinder,
An operating unit connected to the hydraulic device;
The hydraulic device includes an oil tank, a pump that sucks up and discharges hydraulic oil in the oil tank, and an electric motor that drives the pump.
A valve block having a hydraulic oil inlet port connected to a hydraulic oil outlet of the pump, a cylinder connection port connected to the hydraulic cylinder, and a hydraulic oil return port for returning hydraulic oil to an oil tank;
A solenoid valve integrally provided in the valve block;
An operation of operating the solenoid valve to simultaneously extend and retract the first to fourth hydraulic cylinders by a switch operation of the operation unit, and an operation of extending or retracting any one of the first to fourth hydraulic cylinders A lift platform device characterized in that The hydraulic device includes a front hydraulic unit and a rear hydraulic unit, and the front hydraulic unit simultaneously extends and retracts the first and second hydraulic cylinders, and either the first or second hydraulic cylinder It is possible to operate to selectively extend or
The rear hydraulic unit is capable of simultaneously expanding and contracting the third and fourth hydraulic cylinders and selectively expanding and contracting any of the third and fourth hydraulic cylinders. The elevator board apparatus according to claim 1.   The elevator platform device according to claim 1 or 2, wherein the hydraulic fluid discharge port of the pump is directly connected to the hydraulic fluid inlet port of the valve block.   The elevator platform has a beam which can be extended in the left and right direction respectively on the left and right of the front and the left and right of the rear, and the first to fourth hydraulic cylinders are attached to the end of the beam, respectively. The elevator board apparatus as described in any one of claim | item 1 thru | or 3.

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