JP6945406B2 - Lifting platform device - Google Patents

Description

The present invention relates to a lift device for raising and lowering a lift with a hydraulic cylinder, and more particularly to a lift device capable of adjusting the inclination of the lift.

Conventionally, a removable body has been proposed in which a body for loading cargo or the like is separated from the loading platform of a vehicle and made to stand on its own. In this case, the stroke of the hydraulic cylinder provided on the body is generally not finely adjusted individually, and the body is usually separated on a substantially horizontal ground.

By the way, even in the lifting platform device that is transported by vehicle, it may be used separately from the vehicle loading platform. In this case, depending on the application, it may be used on a slope, and a function capable of maintaining the lift table horizontally even on a slope is required.

The present invention has been made in recognition of such a situation, and an object of the present invention is to provide an elevating table device capable of adjusting the inclination of the elevating table.

One aspect of the present invention is a lift device. This lift device
Lifting platform and
A first hydraulic cylinder that raises and lowers the front left side of the lift,
A second hydraulic cylinder that raises and lowers the front right side of the lift,
A third hydraulic cylinder that raises and lowers the rear left side of the lift,
A fourth hydraulic cylinder that raises and lowers the rear right side of the lift,
A hydraulic device installed on the lift and driving each hydraulic cylinder,
The operation unit connected to the hydraulic device is provided.
The lift has beams that can be extended in the left-right direction, respectively, on the left and right sides of the front portion and on the left and right sides of the rear portion, and the first to fourth hydraulic cylinders are attached to the ends of the beams, respectively.
The hydraulic system 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 side port connected to the hydraulic oil discharge port of the pump, a cylinder connection port connected to the hydraulic cylinder, and a hydraulic oil return side port for returning hydraulic oil to the oil tank.
An electromagnetic change-over valve which is provided integrally with the valve block,
It has a tuning valve capable of supplying or returning an equal amount of hydraulic oil to the extension side port of each hydraulic cylinder, and an electromagnetic on-off valve inserted between each hydraulic cylinder and the tuning valve .
The switch operation of the operation unit, the first to fourth the electromagnetic switching valve as opened all of the expansion side port is operated to return side working oil supply side or hydraulic oil to and the solenoid valve The operation of simultaneously expanding and contracting the hydraulic cylinders of No. 1 and the operation of expanding and contracting any one of the first to fourth hydraulic cylinders are possible.

The hydraulic device has a front hydraulic unit and a rear hydraulic unit, and the front hydraulic unit simultaneously expands and contracts the first and second hydraulic cylinders, and either the first or second hydraulic cylinder. It is possible to selectively expand and contract the cylinder.
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 either of the third or fourth hydraulic cylinders.

It is preferable that the hydraulic oil discharge port of the pump is directly connected to the hydraulic oil inlet side port of the valve block.

Any combination of the above components and a conversion of the expression of the present invention between methods, systems and the like are also effective as aspects of the present invention.

According to the elevating table device according to the present invention, it is possible to simultaneously expand and contract the front, rear, left and right hydraulic cylinders of the elevating table and selectively expand and contract a specific hydraulic cylinder, and the inclination of the elevating table can be adjusted. Is. Therefore, for example, even when the elevating table device is arranged on an inclined surface (inclined road or the like), the inclination and posture of the elevating table can be corrected, and the elevating table can be maintained horizontally.

In the embodiment of the lifting platform device according to the present invention, (A) is a schematic plan view showing a state in which the lifting platform device is placed and fastened on the loading platform of a carrier, and (B) is an operation unit. Top view showing the remote controller. In the embodiment, a side view showing a state in which the lifting platform device is fastened on the loading platform of the transport vehicle. Similarly, a side view showing a state in which the lifting platform device is separated on the loading platform of the transport vehicle. Similarly, a side view showing a case where the transport vehicle is moved forward and backward with respect to the self-supporting lift device. FIG. 5 is a side view of the lift device according to the embodiment. The same front view. The same rear view. The hydraulic circuit diagram of the hydraulic system in embodiment. The front view which shows the structure of the front part and the rear part hydraulic unit of the hydraulic system. The same plan view. The front view which shows the structure of the valve block which integrated the electromagnetic switching valve and the like in the hydraulic unit. The same side view.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, processes, etc. shown in the drawings are designated by the same reference numerals, and redundant description will be omitted as appropriate. Further, the embodiment is not limited to the invention but is an example, and all the features and combinations thereof described in the embodiment are not necessarily essential to the invention.

FIG. 1 is an embodiment of the lifting platform device according to the present invention, and FIG. 1A is a schematic plan view showing a state in which the lifting platform device 10 is placed and fastened on the loading platform 2 of the carrier 1. ) Is a plan view showing a remote controller 30 as an operation unit, FIG. 2 is a side view showing a state in which the lifting platform device 10 is placed and fastened on the loading platform 2 of the carrier 1, and FIG. FIG. 4 is a side view showing a state in which the lift device 10 is separated, and FIG. 4 is a side view showing a case where the carrier 1 is moved forward and backward with respect to the self-supporting lift device 10. 5 is a side view of the lifting platform device 10, FIG. 6 is a front view of the lifting platform device 10, FIG. 7 is a rear view of the same, FIG. 8 is a hydraulic circuit diagram of the hydraulic device 20, and FIG. Front view showing the structure of the units 20A and 20B, FIG. 10 is the same plan view, FIG. 11 is the front view showing the structure of the valve block in which the electromagnetic switching valve and the like in the hydraulic units 20A and 20B are integrated, and FIG. 12 is the same side surface. It is a figure.

As shown in these figures, the lift device 10 has a lift 15 (a box shape having a side wall and a ceiling, a plate shape, or a frame shape) and the traveling vehicle 1. The first hydraulic cylinder 11 that raises and lowers the front right side of the lift 15 in the direction, the second hydraulic cylinder 12 that raises and lowers the front left side of the lift 15, and the third hydraulic cylinder that raises and lowers the rear left side of the lift 15. A remote controller as an operation unit having a cylinder 13, a fourth hydraulic cylinder 14 that raises and lowers the rear right side of the lifting table 15, a hydraulic device 20 that can raise and lower each hydraulic cylinder 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 the control panel 25 in which the electric control system of the hydraulic device 20 is housed.

As shown in FIGS. 6 and 7, the elevating table 15 has beams 16 that can project in the left-right direction, respectively, on the left and right sides of the front portion and on the left and right sides of the rear portion, and the first to fourth hydraulic cylinders 11 to 14 have. It is attached to each end of the beam 16. The beam 16 is slidably (pulled out and retractable) in the left-right direction (lateral direction) by a square pipe-shaped frame 17 integrally provided by the elevating table 15. As shown in FIG. 2, the beam 16 is pulled out and retracted in a state in which the lifting platform device 10 is placed and fastened on the loading platform 2 of the carrier 1, and the piston rods 11a to the first to fourth hydraulic cylinders 11 to 14 are engaged. This can be done with the 14a contracted. A well-known container fastening mechanism or the like can be used as a mechanism for fastening and releasing the lifting platform device 10 to the loading platform 2. The beam 16 can be fixed to the pipe-shaped frame 17 by bolts at a plurality of drawer positions.

The hydraulic device 20 includes a front hydraulic unit 20A installed at the front of the lift 15 as shown in FIG. 6, a rear hydraulic unit 20B installed at the rear of the lift 15 as shown in FIG. 7, and both hydraulic units. It has a control panel 25 that houses an electric control system that controls 20A and 20B. The control panel 25 is arranged 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 simultaneously expand and contract the first and second hydraulic cylinders 11 and 12. It is possible to selectively expand and contract either the first or second hydraulic cylinders 11 and 12. The rear hydraulic unit 20B can simultaneously expand and contract the third and fourth hydraulic cylinders 13 and 14, and selectively expand and contract either of the third or fourth hydraulic cylinders 13 and 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 elevating table 15, a hydraulic pump 22 that sucks up and discharges hydraulic oil in the oil tank 21, and a pump. It has an electric motor 23 to be driven, and a valve block 24 integrally provided with electromagnetic switching valves 41, 42, 43, a relief valve 45, and the like as shown in FIGS. 11 and 12. The valve block 24 has a hydraulic oil inlet side port P to which the hydraulic oil discharge port of the pump 22 is connected (directly connected by being screwed), and cylinder connection ports A1, A2, A3 connected to the hydraulic cylinder. B1 has a hydraulic oil return side port T for returning hydraulic oil to the oil tank 21. As shown in FIG. 11, the spools (valve bodies) 41a, 42a, 43a of the electromagnetic switching valves 41, 42, 43 and the spools (valve body) 45a of the relief valve 45 are required in the hydraulic oil path formed in the valve block 24. It is provided so that it can be moved to fulfill 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 (extended side port) via the pilot check valve 52. It is connected to each of the extension port). The cylinder connection port A2 is connected to the first hydraulic cylinder 11 (extension side port) via a tuning valve 55, an electromagnetic on-off valve 61, and a pilot check valve 51 that equally distribute hydraulic oil, and the tuning valve 55, electromagnetic. 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 the 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 side port) via the pilot check valve 54. It is 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, the electromagnetic on-off valve 63, and the pilot check valve 53 that distribute the hydraulic oil in equal amounts, and the tuning valve 56 and the electromagnetic wave. 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 and 14 (contraction side ports) via the pilot check valves 53 and 54.

The cooperation between the front hydraulic unit 20A and the rear hydraulic unit 20B controls the rotation speeds of the electric motor 23 controlled by the inverter 28A of the hydraulic unit 20A and the electric motor 23 controlled by the inverter 28B of the hydraulic unit 20B to the same value. It can be done by doing. Although not shown, an AC or DC power supply is connected to the inverters 28A and 28B.

As shown in FIG. 1 (B), the remote controller 30 as an 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, and No. It has a .1 jack selection switch 61, a No. 2 jack selection switch 62, a No. 3 jack selection switch 63, a No. 4 jack selection switch 64, and a pump operation indicator light 65.

Hereinafter, the operation of the lifting platform device 10 according to the present embodiment will be described.

As shown in FIGS. 1A and 2, a state in which the lifting platform device 10 is placed on the loading platform 2 of the transport vehicle 1 and fastened (the piston rods 11a to 14a of the first to fourth hydraulic cylinders 11 to 14 are In the contracted state), the lifting platform device 10 can be transferred to an arbitrary place by the transport vehicle 1. Further, in a state where the lifting platform device 10 is not fastened to the loading platform 2, the piston rods 11a to 14a of the first to fourth hydraulic cylinders 11 to 14 are extended as shown in FIG. The carrier 1 can be moved to a remote position as shown in FIG. 4 in a self-supporting state lifted from 2, and thereafter, the lifting platform 15 can be lifted and lowered by the lifting platform device 10 alone.

When the button of the hydraulic pump "ON" switch 51 is pressed in the remote controller 30 of FIG. 1B, the electric motors 23 of the hydraulic units 20A and 20B of the hydraulic device 20 start rotating, and the hydraulic pump 22 starts. , The pump operation indicator light 65 lights up. When the hydraulic pump "OFF" switch 52 is pressed, the energization of the electric motors 23 of the hydraulic units 20A and 20B is cut off, and the hydraulic pump 22 is stopped.

When the button of the jack "out" switch 53 is pressed while the hydraulic pumps 22 of the hydraulic units 20A and 20B are in the activated state, the electromagnetic switching valves 41 and 43 in FIG. 8 are closed and the electromagnetic switching valve 42 in which the solenoid 42a is excited is opened. When it is opened, hydraulic oil is sent from the cylinder connection port A2 through one path of the electromagnetic switching valve 42, and in the hydraulic unit 20A, the hydraulic oil is divided into two by the tuning valve 55, and the first is passed through the electromagnetic on-off valves 61 and 62 in the open state. And the second hydraulic cylinders 11 and 12, and in the hydraulic unit 20B, the hydraulic oil is divided into two by the tuning valve 56, and the hydraulic oil is added to the third and fourth hydraulic cylinders 13 and 14 through the electromagnetic on-off valves 63 and 64 in the open state. The first to fourth hydraulic cylinders 11 to 14 as jacks extend synchronously, and the lifting platform 15 rises (the hydraulic oil discharged from each of the hydraulic cylinders 11 to 14 is the other path of the electromagnetic switching valve 42. Return to the oil tank 21 through). 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 extended state of each cylinder 11 to 14 is 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 in which the solenoid 42b is excited is opened, and the electromagnetic switching valve 42 is operated 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 and 12 are contracted in the hydraulic unit 20A, and the third and fourth hydraulic cylinders 13 and 14 are contracted in the hydraulic unit 20B. At this time, since the hydraulic oil returns in equal amounts from the first to fourth hydraulic cylinders 11 to 14 at the tuning valves 55 and 56 of the hydraulic oil return path, the first to fourth hydraulic cylinders 11 to 14 contract in synchronization. , The lift 15 descends (the hydraulic oil discharged from each of the hydraulic cylinders 11 to 14 returns to the oil tank 21 through the other path of the electromagnetic switching valve 42). When the button of the jack "ON" switch 54 is stopped, the electromagnetic on-off valves 61 to 64 are closed, and the contracted state of each cylinder 11 to 14 is maintained. In this way, the entire lifting platform 15 can be raised and lowered.

Further, 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, the jack “out” switch 53 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 the front, rear, left and right ends of the lift 15 are extended. One end rises. For example, when the buttons of the No. 1 jack selection switch 61 and 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 activated. When it is opened, hydraulic oil is sent from the cylinder connection port A1 through one path of the solenoid switching valve 41, the first hydraulic cylinder 11 extends, and the front right end of the lift 15 rises (operation discharged from the hydraulic cylinder 11). The oil returns to the oil tank 21 through the other path of the solenoid switching valve 41).

Further, 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, 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 contracts, and the front, rear, left and right ends of the lift 15 One end of is descending. For example, when the buttons of the No. 4 jack selection switch 64 and 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. Then, hydraulic oil 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 is lowered (discharged from the hydraulic cylinder 14). The hydraulic oil returns to the oil tank 21 through the other path of the solenoid switching valve 43).

In this way, by using the jack selection switches 61 to 64, one end of the front, rear, left and right ends of the lift 15 can be selectively raised and lowered, and the lift device 10 is arranged on an inclined surface (for example, an inclined road). Even if this is the case, the inclination and posture of the elevating table 15 can be corrected, and for example, the elevating table 15 can be maintained horizontally.

According to this embodiment, the following effects can be obtained.

(1) The operation of simultaneously expanding and contracting the front, rear, left and right hydraulic cylinders 11 to 14 of the elevator table 15 and the operation of selectively expanding and contracting a specific hydraulic cylinder are possible, and the inclination of the elevator table 15 can be adjusted. Therefore, for example, even when the elevating table device 10 is arranged on an inclined surface (inclined road or the like), the inclination and posture of the elevating table 15 can be corrected, and the elevating table 15 can be maintained horizontally. ..

(2) The hydraulic circuit of the hydraulic device 20 uses a valve block 24 in which electromagnetic switching valves 41, 42, 43, relief valves 45, etc. are integrally provided, and the spools of the electromagnetic switching valves 41, 42, 43. (Valve bodies) 41a, 42a, 43a and the spool (valve body) 45a of the relief valve 45 are movably provided in the hydraulic oil path formed in the valve block 24 so as to perform a required function. The hydraulic circuit can be configured compactly and robustly.

(3) The hydraulic device 20 has a front hydraulic unit 20A and a rear hydraulic unit 20B, and the front hydraulic unit 20A simultaneously expands and contracts the first and second hydraulic cylinders 11 and 12 on the front side, and the first or the first or An operation of selectively expanding and contracting one of the second hydraulic cylinders 11 and 12 is performed, and an operation of the rear hydraulic unit 20B simultaneously expanding and contracting the rear third and fourth hydraulic cylinders 13 and 14 and a third or third operation. It is configured to selectively expand and contract any of the fourth hydraulic cylinders 13 and 14, 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 side port P of the valve block 24, the reduction of hydraulic piping, miniaturization and robustness of the device are also made in this respect. Is possible.

(5) The elevating table 15 has beams 16 that can project in the left-right direction, respectively, on the left and right sides of the front part of the elevating table 15 and on the left and right sides of the rear part, and the first to fourth hydraulic cylinders 11 to 14 are at the ends of the beam 16. The positions of the 1st to 4th hydraulic cylinders 11 to 14 can be changed according to the conditions of the ground and the road.

Although the present invention has been described above by taking the embodiment as an example, it will be 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. By the way. Hereinafter, a modified example will be touched upon.

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

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 Electric motor 24 Valve block 25 Control panel 30 Remote controller 41-43 Electromagnetic switching valve 45 Relief valve 51 Flood pump "ON" switch 52 Flood 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 A1, A2, A3, B1 Cylinder connection port P Flood control inlet side port T Flood control return side port

Claims (3)

Lifting platform and
A first hydraulic cylinder that raises and lowers the front left side of the lift,
A second hydraulic cylinder that raises and lowers the front right side of the lift,
A third hydraulic cylinder that raises and lowers the rear left side of the lift,
A fourth hydraulic cylinder that raises and lowers the rear right side of the lift,
A hydraulic device installed on the lift and driving each hydraulic cylinder,
The operation unit connected to the hydraulic device is provided.
The lift has beams that can be extended in the left-right direction, respectively, on the left and right sides of the front portion and on the left and right sides of the rear portion, and the first to fourth hydraulic cylinders are attached to the ends of the beams, respectively.
The hydraulic system 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 side port connected to the hydraulic oil discharge port of the pump, a cylinder connection port connected to the hydraulic cylinder, and a hydraulic oil return side port for returning hydraulic oil to the oil tank.
An electromagnetic change-over valve which is provided integrally with the valve block,
It has a tuning valve capable of supplying or returning an equal amount of hydraulic oil to the extension side port of each hydraulic cylinder, and an electromagnetic on-off valve inserted between each hydraulic cylinder and the tuning valve .
The switch operation of the operation unit, the first to fourth the electromagnetic switching valve as opened all of the expansion side port is operated to return side working oil supply side or hydraulic oil to and the solenoid valve A lift device capable of simultaneously expanding and contracting the hydraulic cylinders of No. 1 and expanding and contracting any one of the first to fourth hydraulic cylinders. The hydraulic device has a front hydraulic unit and a rear hydraulic unit, and the front hydraulic unit simultaneously expands and contracts the first and second hydraulic cylinders, and either the first or second hydraulic cylinder. It is possible to selectively expand and contract the cylinder.
The rear hydraulic unit is capable of simultaneously expanding and contracting the third and fourth hydraulic cylinders and selectively expanding and contracting either of the third or fourth hydraulic cylinders. The lifting platform device according to claim 1. The lifting platform device according to claim 1 or 2, wherein the hydraulic oil discharge port of the pump is directly connected to the hydraulic oil inlet side port of the valve block.

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