JP2015024820A - Cargo receiving platform lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate maintenance of a power unit for controlling operation of a cargo receiving platform lifting device, in the cargo receiving platform lifting device of a cargo handling vehicle.SOLUTION: A flexible hydraulic hose 90 connecting a hydraulic cylinder CY driving a cargo receiving platform lifting device E to a power unit PU controlling operation of the hydraulic cylinder, has length to allow the power unit PU to be taken out to a maintenance position, while keeping the connection state.

Description

  The present invention relates to a load receiving table lifting device to which a cargo handling vehicle is attached.

Conventionally, in order to save labor for loading and unloading loads, a cargo handling vehicle provided with a load receiving platform lifting device is known from Patent Document 1 described later.

JP 2004-58805 A

By the way, in the load receiving platform lifting device for a cargo handling vehicle disclosed in Patent Document 1, the hydraulic drive mechanism 10 is used.
The control unit (power unit) U with built-in is mounted on the lower end of the column 2,
The hydraulic pipes 121 and 122 connected to the side surface of the control unit U are respectively connected to the lift cylinder 5 housed in the connection frame 2c and the tilt cylinder 9 provided in the load receiving table 3 to provide hydraulic pressure. The lift cylinder 5 and the tilt cylinder 9 are operated by the control hydraulic pressure from the drive mechanism 10 so that the lifting and lowering operation and the tilt operation of the load receiving platform 3 are performed.

In such a load receiving table elevating device, it is necessary to regularly perform maintenance work on the control unit, the lift cylinder and the tilt cylinder. However, such work is troublesome, cumbersome, and poor in workability. In the case where it is attached to a different place, there is a problem that the tendency is further increased. In the known apparatus, no countermeasure is taken against such a problem.

The present invention has been made in view of such circumstances, so that power units and hydraulic cylinders, particularly when they are mounted in a narrow place, can be easily and easily performed maintenance work thereof. An object of the present invention is to provide a novel cargo receiving table lifting device.

In order to achieve the above object, according to the first aspect of the present invention, there is provided a pair of parallel lifting columns provided on a vehicle body frame, a connecting frame fixed between the lifting columns, and the pair of lifting columns. A load receiving base lifting device including a load receiving base that can be moved up and down, can be extended and stored, a hydraulic cylinder that is provided in the connection frame and can drive the load receiving base up and down, and a power unit that drives the hydraulic cylinder. In
The hydraulic cylinder and the power unit are connected by a flexible hydraulic hose to supply and discharge control hydraulic oil from the power unit to the hydraulic cylinder, and the hydraulic hose connects the hydraulic cylinder and the power unit. The power unit has a length that allows the power unit to be moved to a maintenance position while being connected.

In order to achieve the above-mentioned object, the invention according to claim 2 includes a pair of parallel lifting columns provided on the body frame, a connecting frame fixed between the lifting columns, and the pair of lifting columns. A load receiving base lifting device including a load receiving base that can be moved up and down, can be extended and stored, a hydraulic cylinder that is provided in the connection frame and can drive the load receiving base up and down, and a power unit that drives the hydraulic cylinder. In
The hydraulic cylinder and the power unit are connected by a flexible hydraulic hose to supply and discharge control hydraulic oil from the power unit to the hydraulic cylinder, and the hydraulic hose connects the hydraulic cylinder and the power unit. The hydraulic cylinder has such a length that it can be taken out from the connecting frame while being connected.

In order to achieve the above object, the invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the power unit is provided in the connecting frame.

In order to achieve the above object, the invention described in claim 4 is characterized in that, in the apparatus described in claim 1, the power unit is provided in the connecting frame, and the maintenance position is outside the connecting frame. .

In order to achieve the above object, according to a fifth aspect of the present invention, in the first or third aspect of the present invention, the connection frame is formed in a rectangular tube shape and has an opening on one surface thereof. The power unit is arranged at a position exposed from the opening.

In order to achieve the above object, according to a sixth aspect of the present invention, in the first, second, third, fourth, or fifth aspect, the power unit is interposed through a mounting seat with a cushion in the connection frame. The mounting seat is characterized in that the cushion and the mounting to the connecting frame are shifted laterally.

According to the first aspect of the present invention, the hydraulic cylinder and the power unit are connected by a flexible hydraulic hose so as to supply and discharge control hydraulic oil from the power unit to the hydraulic cylinder. Since the power unit has a length that allows the power unit to be taken out to the maintenance position while the cylinder and the power unit are connected, the power unit can be maintained in a wide space without removing or connecting the hydraulic hose. This can be done and the workability can be greatly improved.

According to the invention described in claim 2, the hydraulic cylinder and the power unit are connected by a flexible hydraulic hose so as to supply and discharge control hydraulic oil from the power unit to the hydraulic cylinder. The hydraulic cylinder has a length that allows the hydraulic cylinder to be taken out from the coupling frame while the power unit is connected, so that the hydraulic cylinder can be maintained in a wide space without removing or connecting the hydraulic hose. Work can be performed, and the workability can be greatly improved.

According to the third aspect of the present invention, the maintenance work can be easily performed even though the power unit is provided in the narrow connecting frame.

According to the invention of claim 4, the power unit housed in the connecting frame can be maintained in a wide space.

According to the fifth aspect of the present invention, a power unit having a high maintenance frequency can be immediately visually recognized through the opening of the connecting frame, and the power unit can be easily taken out from the connecting frame, so that the maintenance work can be performed quickly and easily. be able to.

According to the invention of claim 6, the power unit is attached to the connecting frame through a cushioned mounting seat, and the mounting seat has the cushion portion and the mounting portion shifted laterally. The power unit can reduce the total space of the power unit to reduce the occupied space in the connection frame, and can reduce the operating noise of the power unit.

Side view of a cargo handling vehicle equipped with a cargo receiving platform lifting device 1 is a perspective view of the load receiving platform lifting device as viewed in the direction of the arrow 2 in FIG. Sectional view along line 3-3 in FIG. 4 is a perspective view of a portion surrounded by an imaginary line in FIG. Enlarged sectional view taken along line 5-5 in FIG. 6 arrow view of FIG. Sectional view along line 7-7 in FIG. Enlarged sectional view taken along line 8-8 in FIG. Enlarged sectional view taken along line 9-9 in FIG. Enlarged sectional view taken along line 10-10 in FIG. FIG. 10 is an enlarged sectional view taken along line 11-11. FIG. 10 is an enlarged sectional view taken along line 12-12 of FIG. Exploded perspective view of the main part of the power unit Operational circuit diagram of the loading platform lifting device Action diagram showing the process of removing and installing the power unit

Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

1 to 3, a cargo box V that is open to the rear is mounted on a body frame F of a cargo handling vehicle. A vertical lift type load receiving table lifting device E is mounted on the rear end surface of the cargo box V. The load receiving platform 1 held substantially horizontally is moved up and down between the ground and the floor surface of the cargo box V, and the cargo placed on the load receiving platform 1 is loaded and unloaded between the ground and the cargo box V. Can do.

  Next, the structure of the load receiving table elevating device E according to the present invention will be described.

The load receiving table elevating unit E includes a pair of elevating support columns 2 and 2 extending in parallel to each other, a connecting frame 24 welded between the elevating support columns 2 and 2 substantially orthogonally thereto, and a pair of elevating and lowering units. The load receiving platform 1 is supported by the columns 2 and 2 so as to be movable up and down, and a hydraulic cylinder CY and a power unit PU provided in the connecting frame 24 are provided.

The load receiving platform elevating unit E is integrated with the cargo handling vehicle by fixing a pair of left and right elevating columns 2 and 2 on the left and right sides of the rear end surface of the cargo box V in a substantially vertical direction via brackets 20 (see FIG. 7). It is mounted on.

As shown in FIGS. 1-4, each raising / lowering support | pillar 2 consists of a hollow square cylinder, and the top plate 2 is on the opening upper end.
a is fixed, and an intermediate plate 2b is provided integrally in the vertical direction at the center of each lifting column 2, and a vertical slit 4 for raising and lowering a slider 14 described later is opened in the rear wall. Has been. In addition, at the lower end of each lifting column 2, for guiding the lifting operation of the inner column 3,
A pair of guide rollers 5 are rotatably supported, and the upper ends of the pair of lifting columns 2 and 2 are
Top fixing sheaves 36 and 37 for guiding wires 32 and 33, which will be described later, are rotatably supported by shafts, respectively, and a stopper 10 with which the lower end of the inner column 3 abuts is fixed to the lower end of each lifting column 2. ing.

A pair of left and right inner columns 3 and 3 are inserted into the pair of lifting columns 2 and 2 so as to be movable up and down. Each inner column 3 is constituted by a hollow rectangular tube, and the lifting column 2 is formed on the rear wall thereof.
The other vertical slit 7 is opened so as to coincide with the vertical slit 4. As shown in FIG. 3, a guide roller 8 is rotatably supported at the upper end of each inner column 3 via a bracket 9, and the guide roller 8 is disposed behind the lifting column 2 when the inner column 3 is moved up and down. The inner surface of the inner column 3 is guided up and down by rolling on the inner surface of the wall. An elastic stopper 11 is provided at the lower end of each inner column 3, and this stopper 11 abuts against the stopper 10 at the lower end of the lifting column 2 to restrict the highest position of the inner column 3.

Sliders 14 and 14 are respectively inserted into the pair of inner columns 3 and 3 so as to be movable up and down. The rear edges of the sliders 14 and 14 are the inner columns 3 and 3 and the lifting column 2.
, 2 through the longitudinal slits 4, 4; 7, 7 respectively extending to the rear thereof, guided by the longitudinal slits 4, 4; 7, 7, and the lifting columns 2, 2 and the inner The columns 3 and 3 can be moved up and down.

Upper and lower guide rollers 15 and 16 are rotatably supported on the upper and lower portions of the sliders 14 and 14, and the guide rollers 15 and 16 are lifted and lowered with respect to the inner columns 3 and 3. When rolling, the inner surfaces of the inner columns 3 and 3 are rolled. A stopper rubber 17 is provided on the upper edge of each slider 14, and the stopper rubber 17 engages with the base plate 3a to regulate the ascending position of the slider 14. Brackets 18 and 18 are respectively fixed to lower ends of the outer surfaces of the pair of sliders 14 and 14, and the load receiving platform 1 rotates between these brackets 18 and 18 between a substantially horizontal protruding position and a substantially vertical storage position. The shafts 19 and 19 are provided so that they can be made. A stopper bolt 22 for engaging with the base end of the load receiving base 1 and locking it at the extended position is attached to the stay 21 fixed to the lower end of each slider 14 so that the vertical position can be adjusted. Yes.

The load receiving platform 1 can be lifted and lowered together with the sliders 14 and 14 via the wire interlocking mechanism WM by an expansion / contraction operation of a hydraulic cylinder CY, which will be described later, and is substantially flush with the lowered position on the ground and the floor surface of the cargo box V. It can be moved up and down between the raised position, and the load on the load receiving platform 1 can be
Can be loaded and unloaded between.

As shown by the chain line in FIG. 3, the load receiving platform 1 can be manually rotated around the pivotal support 19 and 19 points between a substantially horizontal protruding position and a substantially vertical storage position. Folded so as to be substantially parallel along the pair of lifting columns 2 and 2. The front part of the receiving platform 1 and a pair of lifting columns 2
, 2 is provided with a locking means (not shown) for securing the load receiving platform 1 to the storage position.

As shown in FIGS. 4 and 7, the left and right ends of the connecting frame 24 extending in the lateral direction at positions substantially coincident with the floor surface of the packing box V are located in the middle portion in the vertical direction of the pair of lifting columns 2 and 2. Welded.

The connection frame 24 is configured by a hollow rectangular tube body, and a cover body 24B is integrally fixed by a plurality of bolts and nuts 23 to an opening of a connection frame body 24A having a U-shaped cross section. . The opening of the connecting frame main body 24A is opened toward the rear of the cargo handling vehicle.

A hydraulic cylinder CY and a power unit PU, which will be described later, are detachably attached to the inside of the connection frame 24 from the opening of the connection frame main body 24A.

As shown in FIGS. 4-7, one end part in the connection frame 24 (the left end part in the forward direction of the cargo handling vehicle)
A rib plate 25 is fixed to the plate. The rib plate 25 is connected to the connecting frame 24.
The central part in the width direction of the end of the frame extends in the vertical direction, and the upper and lower edges are welded to the upper and lower inner surfaces of the connecting frame 24. The rib plate 25 is provided with a mounting hole H1, and the hydraulic cylinder CY is mounted in the mounting hole H1.

The hydraulic cylinder CY is disposed along the longitudinal direction in the connecting frame 24 so as to be biased forward (see FIG. 6), and the base end of the cylinder barrel 26 is connected to the rib plate 25 with the connecting pin. 28 and bolts 29 are attached. The connecting pin 28 is
The mounting hole H1 is inserted into the base of the cylinder barrel 26 of the hydraulic cylinder CY so as to be rotatable, and the base end of the connecting pin 28 is screwed to the rib plate 25 with a bolt 29. As a result, the hydraulic cylinder CY is mounted in the connection frame 24.

The hydraulic cylinder CY is linked to and connected to the load receiving platform 1 via a wire interlocking mechanism WM described below, and according to the expansion and contraction operation of the hydraulic cylinder CY, the load receiving platform 1 is moved along the pair of lifting columns 2 and 2. Raised and lowered.

The wire interlocking mechanism WM has a conventionally known structure, and is provided across the connection frame 24 and the pair of right and left lifting columns 2 and 2.

As shown in FIG. 4, a bracket 30 is attached to the tip of the cylinder rod 27 of the hydraulic cylinder CY.
Left and right movable sheaves 31l and 31r that are movable in the vehicle width direction are attached to the guide rail 38 that is fixed in the longitudinal direction in the connecting frame 24. It is slidably supported. As shown in FIG. 2, the left lifting column 2 has a pair of left and right side fixed sheaves 34 l, 3 in the vicinity of the coupling portion with the connection frame 24.
4r is rotatably mounted in parallel, and the right lifting column 2 has a connecting frame 2
A right side fixed sheave 35 is rotatably mounted adjacent to the right end of 4, and
Left and right top fixed sheaves 36 and 37 are rotatably attached to the upper portions of the left and right lifting columns 2 and 2, respectively.

As shown in FIGS. 2 to 7, left and right systems of wires 32 and 33 are connected to the hydraulic cylinder CY. That is, one end of the left wire 32 is bound to a block 32 a welded to the side surface of the connection frame 24. The wire 32 extends along the connecting frame 24, and the left movable sheave 31 l, the left side fixed sheave 34 l and the left fixed top sheave 36 are wound around in order, and the other end is bound to the left slider 14. ing.
Similarly, one end of the right wire 33 is connected to a block 33a welded to the bottom surface of the connection frame 24 and extends along the connection frame 24. The right movable sheave 31r,
The right side fixed sheaves 34 r and 35 and the right fixed top sheave 37 are wound around in order, and the other end is bound to the right slider 14.

Therefore, if the hydraulic cylinder CY is expanded and contracted, the pair of left and right sliders 14 and 14 are moved up and down synchronously via the two systems of wires 32 and 33, and the load receiving platform 1 connected thereto.
Can be moved up and down.

The power unit PU for driving and controlling the hydraulic cylinder CY is located on the rear side (see FIG. 6) in one end portion of the connection frame 24 and is arranged in parallel with the hydraulic cylinder CY located on the front side thereof.

  Next, the structure of the power unit PU will be described with reference to FIGS.

The power unit PU includes an electric motor 40, a gear pump 41, an oil tank 42, and a valve block 43, which are fixed in a row in the order of the electric motor 40, the gear pump 41, the oil tank 42, and the valve block 43, and are elongated. A unit body is arranged and arranged side by side on one side of the hydraulic cylinder CY.
4 is detachably attached to the bottom surface of the inside.

The pump flange 50 provided with the gear pump 41 includes the electric motor 40 and the oil tank 4.
2 is formed in a square flange shape, and is also used as a motor cover of the electric motor 40, a tank cover of the oil tank 42, and a pump cover of the gear pump 41. One end of the motor main body 40A is abutted against one end surface of the pump flange 50 in the axial direction via the packing 52, and the electric motor 40 passes through the motor cover 40B at the outer end of the motor main body 40A and passes through the motor cover 40B. It is fixed to the pump flange 50 by a plurality of connecting bolts 51 that pass through and are fastened to the outer periphery of the pump flange 50. Further, one end of the tank main body 42A is attached to the packing 5 on the disc-shaped protrusion 50A formed on the other end surface of the pump flange 50.
3, and the other end of the tank main body 42 </ b> A is oil-tightly fitted to a disc-shaped protrusion 43 </ b> A formed on the inner end surface of the valve block 43 via a packing 54. 50, the oil tank 42 and the valve block 43 are integrally fastened by four tie rods 55 extending in the axial direction outside the tank body 40A. Each tie rod 5
5 is threaded into the four corners of the pump flange 50, and the other end penetrates through holes 56 formed in the four corners of the valve block 43.
It is fixed by.

An oil pump (gear pump) 41 is fixed to the pump flange 50 on its central axis. That is, a pump case 60 having a pump gear 61 built in is fixed to the center portion via the bolt 62. An output shaft 63 of the electric motor 40 is connected to a drive shaft 65 of the oil pump 41 via a coupling 64. The oil pump 41 has a pump case 60 and a suction system 66 connected thereto accommodated in the oil tank 42. The suction system 66 has an oil strainer 68 connected to the suction port via a suction adapter 67, and the oil in the oil tank 42 is directly sucked through the oil strainer 68. An oil supply port 71 for supplying oil to the oil tank 42 is provided above the pump flange 50.
And a breather 72 for the oil tank 42 to breathe,
A breather port 72P for breathing the oil tank 42 is opened. This breather 7
No. 2 is located at the uppermost position when the load receiving table elevating unit E is attached to the cargo handling vehicle so that the oil in the oil tank 42 does not leak to the outside.

The discharge port of the oil pump 41 and the high pressure pipe 70 are connected to the recess provided in the discharge port of the gear pump 41 by inserting one end of the high pressure pipe 70. The high pressure pipe 70 is connected to the oil tank 4.
2, the other end is inserted into a recess provided at the inlet of the valve block 43 to connect the high pressure pipe 70 and the inlet of the valve block 43, and the pressurized oil from the oil pump 41 is It is supplied to the valve block 43 through the high-pressure pipe 70. High pressure piping 7
When the pump flange 50 and the valve block 43 are fastened and fixed by the tie rod 55, 0 is supported by a recess provided at the discharge port of the gear pump 41 and a recess provided at the inlet of the valve block 43.

The valve block 43 is integrally provided with a solenoid valve 45, a flow control valve 46, a relief valve 47, a check valve 48, and the like.

As described above, the power unit PU integrally formed by arranging the electric motor 40, the oil pump 41, the oil tank 42, and the valve block 43 in series in the order is elastically supported in the connecting frame 24 so as to be detachable. Hereinafter, the support structure will be described.

As shown in FIGS. 5 and 9, a power unit accommodation space 75 is formed in the connection frame 24 on one side (the vehicle rear side) of the hydraulic cylinder CY. By removing the cover body 24 </ b> B of the connection frame 24, the power unit PU is accommodated in the power unit accommodation space 75. In the power unit accommodation space 75, the power unit PU is attached to the bottom surface of the connection frame 24. As shown in FIG. 10, a pair of mounting holes H2, H2; H2 ′, H2 ′ are formed on the left and right sides of the bottom surface of the connecting frame 24 with a space in the left-right direction.
In these mounting holes H2, H2; H2 ', H2', a rectangular base plate 76 having a cross-sectional channel shape is mounted via mounting seats 77, 77, and the power unit PU is installed and fixed on the base plate 76. The

As shown in FIG. 13, the mounting seats 77 are arranged on the upper and lower surfaces of the plate-like cushion rubber 77R,
The lower mounting plates 77U and 77D are baked and fixed to form a three-layer structure. In particular, the mounting seat 77 is configured by shifting the mounting portion and the cushion portion in the lateral direction. Upper mounting plate 77
U and cushion rubber 77R are substantially the same size and are formed in a flat convex shape, whereas lower mounting plate 77D is formed in a square shape, and upper mounting plate 77U and cushion rubber 77R of lower mounting plate 77D are connected to each other. Pairs of weld nuts 82 are welded to the avoided front and rear positions.

As shown in FIGS. 10 and 12, the longitudinal end of the base plate 76 (left side in FIG. 10)
Two connecting bolts 7 penetrating the lower mounting plate 77D and the cushion rubber 77R of the mounting seat 77.
79 and 79 are fastened to the pump flange 50 through the base plate 76, while the other end side (the right side in FIG. 11) of the base plate 76 extends through the lower mounting plate 77D of the mounting seat 77 and the cushion rubber 77R. The connecting bolts 79 ′ and 79 ′ are screwed into the nuts 80, 80 on the base plate 76 through the base plate 76, whereby a pair of mounting seats 7
7,77 are fixed to the bottom surface of the power unit PU.

Also, as shown in FIGS. 10 and 12, the attachment holes H2, H2 from below the connecting frame 24.
A pair of mounting seats 77 and 77 are fixed to the bottom surface of the connecting frame 24 by screwing bolts 78 inserted through H2 'and H2' into the weld nuts 82 of the mounting seats 77 and 77; When the plurality of bolts 78 are screwed off from the weld nut 82, the power unit PU can be detached from the connection frame 24 together with the mounting seats 77, 77.

Thus, the mounting seat 77 has the elastic support height of the power unit PU in the connecting frame 24 by the mounting seat 77 by shifting the cushion rubber 77R and the mounting portion to the connecting frame 24 in the lateral direction. It becomes possible to keep the power unit PU low, and the power unit PU can be easily attached to and detached from the narrow connecting frame 24, and the operating noise of the power unit PU can be reduced.

The valve block 43 is directly fixed to the base plate 76 by other bolts 81.

As shown in FIGS. 5 and 15, one end side of the power unit PU, that is, the valve block 43
One end of a flexible hydraulic hose 90 made of rubber, soft synthetic resin or the like is connected to the discharge side of the power unit PU. The hydraulic hose 90 is connected to the power unit PU along the side in the longitudinal direction of the power unit PU. Is connected to the base of the cylinder barrel 26 of the hydraulic cylinder CY.

Thus, the flexible hydraulic hose 90 is used to take out the power unit PU from the connecting frame 24 while the power unit PU and the hydraulic cylinder CY are connected, or to move the inside of the connecting frame 24 in the longitudinal direction. Have the required length. As shown in FIGS. 5, 8, and 9, a plurality of intermediate portions of the hydraulic hose 90 are supported by clips 91 attached to the upper surface of the connection frame 24. The clip 91 is a support portion 90a of the hydraulic hose 90.
Is made of a steel plate coated with a covering material such as vinyl chloride, and the support portion 90
The both ends of the clip 91 that supports the winding of the hydraulic hose 90 by a are overlapped, and the connection frame 24 is composed of a support bolt 93 welded to the upper surface of the connection frame 24 and a nut 94 screwed there. Suspended and supported on the upper surface.

As shown in FIGS. 4 and 9, the corner portion between the rear surface and the lower surface of the connecting frame 24 is an inclined surface 244.
The safety bar 39 extends along the connecting frame 24 at the lower rear surface of the connecting frame 24 when the load receiving platform 1 is raised. Is supported, and the power unit PU can be operated by operating the safety bar 39.
The operation of can be emergency stop.

As shown in FIGS. 4 and 5, the hydraulic cylinder C is welded to the end in the connecting frame 24.
A contactor 44 connected to the electric circuit of the power unit PU is fixed to one surface of the rib plate 25 to which Y is attached by a bolt 59. A terminal block T for connecting the battery 49 and the main switch Sm in the cab is fixed to the left side of the front surface of the connecting frame 24 in the vehicle traveling direction.

FIG. 14 shows an electric and hydraulic circuit diagram of the power unit PU. The electric motor 40
The main circuit Sm provided in the driver's cab of the vehicle and the control switch S disposed above the lifting column 2 on the left side in the vehicle traveling direction
c (see FIG. 1) and the contactor 44 are connected. A gear pump 41 is connected to the electric motor 40, a discharge side of the gear pump 41 is connected to a high pressure chamber of a single acting hydraulic cylinder CY via a hydraulic pipe 96, and an intake side of the oil pump is connected to an oil tank via an oil strainer 68. 42. The upstream side of the check pipe 48 of the hydraulic pipe 96 is communicated with the oil tank 42 via the relief valve 47, and the check valve 4 of the hydraulic pipe 96 is connected.
The downstream side of 8 is communicated with the oil tank 42 via a solenoid valve 45 and a flow control valve 46.

[Uplift operation of the loading platform]
When the main switch Sm is turned “ON” and then the “up” of the control switch Sc is pressed, the contact of the contactor 44 is turned on and the electric motor 40 is rotated.

When the gear pump 41 is driven by the rotation of the electric motor 40, the oil in the oil tank 42 is sucked up, pressurized, and pumped to the hydraulic cylinder CY via the check valve 48. As a result, the hydraulic cylinder CY is extended, and the slider 14 is lifted through the wire interlocking mechanism WM as described above to lift the load receiving platform 1. When the load applied to the load receiving platform 1 exceeds a predetermined value, the relief valve 47 is opened, and the pressurized oil from the gear pump 41 is
The oil is returned to the oil tank 42 through the relief valve 47.

[Dropping operation of the receiving platform]
When the “lower” of the control switch Sc is pressed, the solenoid valve 45 is switched, the oil in the hydraulic cylinder CY is returned to the oil tank 42, the hydraulic cylinder CY is contracted, and the load receiving platform 1 is lowered by its own weight. To do. At this time, the flow control valve 46 restricts the amount of oil returned to the oil tank 42 and slowly lowers the load receiving platform 1.

By the way, the power unit PU provided in the connection frame 24 includes the electric motor 40,
The gear pump 41, the oil tank 42, and the valve unit 43 are provided. When performing maintenance work on the gear pump 41, the power unit PU is connected to the power unit PU because it is difficult to keep the power unit PU installed in the connection frame 24. It is necessary to take it out of the frame 24.

A process of taking out the power unit PU from the connection frame 24 to the outside will be described with reference to FIG.

(1) As shown in FIG. 15A, a plurality of bolts and nuts 23 are detached and a cover body 24B is removed.
Is removed from the connecting frame main body 24A.

(2) Next, by detaching the plurality of bolts 78, the power unit PU is separated from the connection frame main body 24A together with the mounting seat 77 and the base plate 76, and further, the plurality of clips 91 are removed, and the hydraulic hose 90 is connected to the connection frame main body. Separate from 24A.

(3) As shown in FIG. 15B, the power unit PU is taken out from the opening of the connection frame main body 24A and placed on the connection frame main body 24A. At this time, as described above, the hydraulic hose 90 remains connected to the power unit PU and the hydraulic cylinder CY. And the maintenance work of power unit PU can be easily performed outside the connection frame main body 24A. Further, the maintenance work of the hydraulic cylinder CY can be easily performed by utilizing the space generated when the power unit PU is removed.

(4) After the above operation is completed, the power unit PU is connected to the hydraulic cylinder C by the hydraulic hose 90.
While being connected to Y, it is returned to the connecting frame main body 24A.

As described above, the power unit PU housed in the connection frame 24 is connected to the hydraulic pipe 90.
While being connected to the hydraulic cylinder CY, the maintenance work can be performed by taking it out of the connecting frame 24. Further, in order to store the power unit PU and the hydraulic cylinder CY in the narrow connecting frame 24, it is necessary to arrange them close to each other, but the power unit PU having a high maintenance frequency is close to the opening of the connecting frame 24. By arranging on the vehicle rear side, the maintenance work of the power unit PU can be performed as soon as the cover body 24B is removed.

As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.

For example, in the above embodiment, the load receiving platform lifting device is provided on the pair of lifting columns 2 and 2 fixed on both sides of the rear end surface of the packing box V. A load receiving table lifting device may be provided. In this case, the connecting frame is provided in the front-rear direction of the side portion of the vehicle body frame. In the embodiment, the hydraulic hose 90 is connected to the power unit PU.
In the above description, the hydraulic cylinder CY can be removed from the connection frame 24. In this case, the hydraulic hose can be removed from the connection frame 24. Reference numeral 90 denotes a length that can be taken out from the connecting frame 24. In the embodiment, the hydraulic cylinder CY is arranged in front of the cargo handling vehicle and the power unit PU is arranged in parallel on the rear side. However, the hydraulic cylinder CY is arranged in parallel on the rear side of the handling vehicle and the power unit PU is arranged in parallel on the front side. In this case, if the hydraulic cylinder CY arranged near the opening of the fixed frame 24 is removed from the fixed frame 24, the maintenance work of the power unit PU can be easily performed. In the above embodiment, the inner column 3 is inserted into the pair of lifting columns 2 and 2 so as to be slidable up and down, and the slider 14 is moved up and down along the lifting columns 2 and 2 and the inner column 3. 14 may be directly moved up and down in the lifting columns 2 and 2.

1 Loading platform 2 Lifting column 24 Connecting frame 77 Mounting seat 77R Cushion ()
78 Mounting (Bolt)
82 Mounting (weld nut)
90 Hydraulic hose 42 Oil tank F Body frame CY Hydraulic cylinder PU Power unit

Claims (6)

A pair of parallel lifting / lowering columns (2, 2) provided on the vehicle body frame (F), a connecting frame (24) fixed between the lifting / lowering columns (2, 2), and the pair of lifting columns (2 ,
2) a cradle (1) provided in a manner that can be raised and lowered, extended and stowable, and the connecting frame (2
4) In a load receiving table lifting and lowering device comprising a hydraulic cylinder (CY) provided inside and capable of moving the load receiving table (1) up and down, and a power unit (PU) for driving the hydraulic cylinder (CY).
The hydraulic cylinder (CY) and the power unit (PU) are connected to the power unit (
Flexible hydraulic hose (PU) to supply and discharge control hydraulic fluid from the PU to the hydraulic cylinder (CY).
90), and the hydraulic hose (90) can move the power unit (PU) to the maintenance position while the hydraulic cylinder (CY) and the power unit (PU) are connected to each other. A cargo receiving platform elevating device characterized by comprising: A pair of elevating columns (2, 2) provided on the vehicle body frame parallel to each other, a connecting frame (24) fixed between the elevating columns (2, 2), and the pair of elevating columns (2, 2) A cradle (1) provided so as to be able to move up and down and extend and retractable, a hydraulic cylinder (CY) provided in the connecting frame (24) and capable of driving the cradle (1) up and down, and the hydraulic pressure In a load receiving table lifting device including a power unit (PU) for driving a cylinder (CY),
The hydraulic cylinder (CY) and the power unit (PU) are connected to the power unit (
Flexible hydraulic hose (PU) to supply and discharge control hydraulic fluid from the PU to the hydraulic cylinder (CY).
90), and the hydraulic hose (90) takes out the hydraulic cylinder (CY) from the connecting frame (24) while the hydraulic cylinder (CY) and the power unit (PU) are connected. A load receiving table lifting device characterized by having a length that can be adjusted. 3. The load receiving platform lifting apparatus according to claim 1, wherein the power unit (PU) is provided in the connection frame (24). 2. The load receiving platform elevating device according to claim 1, wherein the power unit (PU) is provided in the connection frame (24), and a maintenance position is outside the connection frame (24). The connection frame (24) is formed in a rectangular tube shape and has an opening on one surface thereof, and the power unit (PU) is disposed at a position exposed from the opening. Item 5. The cargo receiving platform lifting apparatus according to Item 3 or 4. The power unit (PU) is attached to the coupling frame (24) via a cushioned mounting seat (77). The mounting seat (77) is connected to the cushion (77R) and the coupling frame (24). 6. The load receiving platform lifting device according to claim 1, wherein the mounting (78, 82) is shifted laterally.

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