JP5350746B2 - Cargo loading platform lifting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust wire length in a state that a wire of a wire interlocking mechanism for lifting a load receiving base by interlocking a lifting cylinder with the load receiving base is assembled, in a cargo vehicle. <P>SOLUTION: The load receiving base 1 can be lifted along lifting struts 2, 2 through the wire interlocking mechanism WM by the lifting cylinder CY provided on a cross member 24, and a wire inspection port 95 capable of adjusting the length of the wires 32, 33 of two systems of the wire interlocking mechanism WM is provided on the cross member 24. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  According to the present invention, a cross member is fixed to a pair of elevating columns provided upright on a body frame so that a load receiving table can be raised and lowered, and an elevating cylinder is provided in the cross member, and the elevating cylinder is provided with a wire interlocking mechanism. The load receiving platform can be adjusted so that the load receiving platform can be moved up and down along a pair of lifting columns by connecting and retracting the lifting platform, and in particular, the load receiving platform can be moved up and down while maintaining a horizontal state. Relates to the device.

The cargo receiving platform raising / lowering device for the cargo handling vehicle is known from Japanese Patent Application Laid-Open No. 2003-133260.
JP 2004-58805 A

  In such a loading platform lifting device for a cargo handling vehicle, a lifting cylinder for driving the loading platform up and down is provided in a cross member fixed to a pair of lifting columns, as disclosed in Patent Document 1, and this lifting and lowering is performed. The movable part of the cylinder is connected to the load receiving platform through two left and right wires, which are guided by a plurality of sheaves, and have different lengths. The table is designed to move up and down.

  By the way, during the lifting operation of the load receiving table, a tensile force always acts on these wires. Therefore, the accumulation of the lifting operation of the load receiving table causes the two lines of wire to gradually grow, and the two lines of wire There is a difference in the overall length of the wire (the longer wire has a greater elongation than the shorter wire), and as a result, the load receiving platform supported on the left and right by the two wires is inclined in the left and right direction. End up.

Therefore, in order to make the load receiving table horizontal, it is necessary to adjust the length of the wire, but in the past, the wire was taken out of the load receiving table lifting device and the length was adjusted. the work is complicated, work efficiency takes a great deal of effort and time to the adjustment there is a problem that you have with the bad.

  The present invention has been made in view of the above circumstances, and provides a novel cargo receiving platform lifting device for a cargo handling vehicle that allows the length to be adjusted while the wire is assembled to the cargo receiving platform lifting device. Objective.

In order to achieve the above-mentioned object, the invention according to claim 1 is a cross-member fixed in a lateral direction between a pair of elevating columns and a pair of elevating columns that are integrally provided upright with a gap to the body frame. And a load receiving base provided on the pair of lifting posts so as to be movable up and down, a lifting cylinder provided in the cross member, and a wire interlocking mechanism for interlockingly connecting the lifting cylinder and the load receiving base. In a load receiving platform lifting device for a cargo handling vehicle, which is capable of moving the load receiving platform up and down along a pair of lifting columns through an interlocking mechanism.
The wire interlocking mechanism has two systems of different lengths, one end of which is connected to the cross member and the other end is connected to the load receiving table, and these wires are connected to the load receiving platform from the lifting cylinder through a pair of lifting columns. A movable sheave and a fixed sheave to guide the
The lifting cylinder extends in the longitudinal direction in the cross member, and a bracket provided with the movable sheave is attached to the tip of a cylinder rod that is extended and contracted. The cross member is attached to a cylinder barrel of the lifting cylinder. A wire inspection port capable of adjusting the length of the wire is provided on the proximal end side, and one end of the wire, which is fixed to the cross member on the side of the cylinder barrel through the wire inspection port, can be pulled out. Yes.

  In order to achieve the above object, the invention described in claim 2 according to claim 1 is characterized in that, in the invention described in claim 1, the wire inspection port has a cutout portion capable of locking one end of a wire drawn out from the wire inspection port. It is said.

  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 wire inspection port is provided on the bottom surface of the cross member.

  In order to achieve the above object, according to a fourth aspect of the present invention, in the first, second, or third aspect, a power unit for driving the elevating cylinder is provided in the cross member. It is a feature.

  According to the first aspect of the present invention, since the wire inspection opening capable of adjusting the length of the wire is provided in the cross member, the wire length can be adjusted while the wires are assembled.

According to the second aspect of the invention, the wire access port, so that having a notch which can engage one end of a wire drawn therefrom, it is possible to temporarily fix the wire to the lead position, the wire length The height adjusting operation can be performed more easily.

  According to the third aspect of the present invention, since the wire inspection port is provided on the bottom surface of the cross member, the wire inspection port is outside the trajectory where the load receiving table moves up and down, and the wire receiving port is mistakenly received during the wire length adjustment. Even if the platform is raised and lowered, there is no harm to the operator who adjusts the length of the wire. Further, the wire inspection port does not affect the loading / unloading operation of the load between the load receiving platform and the cargo box.

  According to the invention described in claim 4, since the power unit for driving the lifting cylinder is provided in the cross member, both the maintenance of the power unit and the length adjustment of the wire are performed from a close distance from the cross member. Can be carried out and their work efficiency can be improved.

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

  FIG. 1 is a side view of a cargo handling vehicle equipped with a cargo receiving platform lifting apparatus of the present invention, FIG. 2 is a perspective view of the cargo receiving platform lifting apparatus as viewed in the direction of the arrow 2 in FIG. 1, and FIG. 3 is a line 3-3 in FIG. 4 is a perspective view of a portion surrounded by an imaginary line 4 shown in FIG. 2, FIG. 5 is an enlarged cross-sectional view taken along line 5-5 of FIG. 3, and FIG. 6 is a view taken along arrow 6 of FIG. 7 is a sectional view taken along line 7-7 in FIG. 6, FIG. 8 is an enlarged sectional view taken along line 8-8 in FIG. 5, and FIG. 9 is an enlarged sectional view taken along line 9-9 in FIG. 10 is an enlarged sectional view taken along line 10-10 in FIG. 6, FIG. 11 is an enlarged sectional view taken along line 11-11 in FIG. 10, and FIG. 12 is an exploded perspective view of the main part of the power unit. 13 and 14 are diagrams illustrating a wire drawing process, FIG. 15 is a diagram illustrating a wire length adjusting process, and FIG. 16 is an operation circuit diagram of the load receiving table lifting device.

  1 to 3, a cargo box V that is open to the rear side is mounted on the body frame F of the cargo handling vehicle, and a vertical lifting type load receiving table lifting device L is provided on the rear end surface of the body frame F. The device L raises and lowers the load receiving platform 1 held substantially horizontally between the ground and the floor surface of the cargo box V, and loads and unloads the load placed on the load receiving platform 1 between the ground and the cargo box V. can do.

  On the left and right sides of the rear end of the packing box V, a pair of right and left lifting columns 2, 2 extending in a substantially vertical direction are fixed via brackets 20 (see FIG. 7), respectively. Each lifting column 2 is formed of a hollow rectangular tube, and a top plate 2a is fixed to the upper end of the opening. Further, an intermediate plate 2b is integrally provided in the center in the lifting column 2 in the vertical direction. A vertical slit 4 for raising and lowering a slider 14 described later is opened on the rear wall of the lifting columns 2 and 2. A pair of guide rollers 5 for guiding the lifting operation of the inner column 3 is rotatably supported at the lower end of each lifting column 2, and a wire 32 described later is further mounted at the upper ends of the lifting columns 2 and 2. , 33 are rotatably supported by top fixing sheaves 36, 37, and stoppers 10, 10 with which the lower end of the inner column 3 abuts are fixed to the lower ends of the lifting columns 2, 2. .

In the pair of lifting columns 2, 2, a pair of right and left inner column 3, 3 are inserted their respective liftably fitted. Each inner column 3 is constituted by a hollow rectangular tube, and another vertical slit 7 is opened on the rear wall so as to coincide with the vertical slit 4 of the lifting column 2. As shown in FIG. 3, a pair of guide rollers 8, 8 are rotatably supported at the upper end of each inner column 3 via a bracket 9, and these guide rollers 8, 8 are connected to the inner columns 3, 3. During the raising / lowering operation, the inner walls of the raising / lowering columns 2, 2 roll to guide the raising / lowering of the inner columns 3, 3.

  As shown in FIG. 3, an elastic stopper 12 is provided at the lower end of each inner column 3 via a bracket 11, and this stopper 12 abuts against the stopper 10 at the lower end of the lifting column 2 to raise the inner column 3 to the highest position. To regulate.

  Sliders 14 are inserted into the pair of inner columns 3, 3 so as to be movable up and down, and the rear edges of the sliders 14, 14 are formed on the inner columns 3, 3 and the lifting columns 2, 2. The vertical slits 4, 4; 7, 7 pass through the rear slits and extend rearward thereof, and are guided by the vertical slits 4, 4; 7, 7 to the lifting columns 2, 2 and the inner columns 3, 3. It can move 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.

  As shown in FIGS. 2 to 5 and 7, the left and right sides of the cross member 24 extending in the lateral direction at a position substantially coincident with the floor surface of the packing box V are disposed at the middle portion of the pair of lifting columns 2 and 2 in the vertical direction. Both ends are fixed. As shown in FIG. 7, the cross member 24 is fixed to the vertical frame Fl of the vehicle body frame F via a bracket 20 ', and is constituted by a hollow rectangular tube having a U-shaped cross section. A cover body 24B is integrally fixed with a plurality of bolts and nuts 23 on the opening surface of the main body 24A.

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

As shown in FIGS. 4 to 6, a rib plate 25 is fixed to one end portion in the cross member 24 on the left side in the traveling direction of the cargo handling vehicle. As shown in FIG. 4, the rib plate 25 extends in the vertical direction at the center in the width direction of the end portion (left end portion) of the cross member 24, and the upper and lower edges thereof are welded to the upper and lower inner surfaces of the cross member 24. Yes. 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 cross member 24 so as to be biased toward the front side of the cargo handling vehicle (see FIG. 6), and the base end of the cylinder barrel 26 is the rib plate 25. Are attached with connecting pins 28 and bolts 29. The connecting pin 28 passes through the mounting hole H1 and is rotatably fitted into the base of the cylinder barrel 26 of the hydraulic cylinder CY, and the base end of the connecting pin 28 is screwed to the rib plate 25 with a bolt 29. Thereby, the hydraulic cylinder CY is attached to the cross member 24.

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

  The wire interlocking mechanism WM is provided across the cross member 24 and the pair of right and left lifting columns 2 and 2.

As shown in FIG. 4, left and right movable sheaves 31l and 31r that can move in the vehicle width direction via a bracket 30 are rotatably attached in parallel to the tip of the cylinder rod 27 of the hydraulic cylinder CY. 30 is slidably supported on a guide rail 38 fixed in the cross member 24 along the longitudinal direction. As shown in FIG. 2, a pair of left and right side fixed sheaves 34 l and 34 r are rotatably mounted in parallel on the left lifting column 2 in the vicinity of the joint with the cross member 24, and the right lifting column A right side fixed sheave 35 is rotatably attached to the column 2 in the vicinity of the right end of the cross member 24, and left and right top fixed sheaves 36 and 37 are provided above the left and right lifting columns 2 and 2. Each is mounted for rotation. As shown in FIGS. 2 to 6, two systems of left and right wires 32 and 33 are connected to the hydraulic cylinder CY. That is, the wire 32 of the left system is connected to a block 32 b that is welded to the side surface of the cross member 24 at one side of the cylinder barrel 26 of the hydraulic cylinder CY . The wire 32 extends along the cross member 24, and the left movable sheave 31l, the left side fixed sheave 34l, and the left top fixed sheave 36 are wound around in order, and the other end is bonded to the left slider 14. ing. Also the right route wires 33, the laterally of the cylinder barrel 26 of the hydraulic cylinder CY, one end is sintered wear block 33b which is welded to the bottom surface of the cross member 24, extends along the cross member 24, The right movable sheave 31r, the right side fixed sheaves 34r and 35, and the right top fixed sheave 37 are wound 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 is moved up and down. Can do.

  Of the two left and right wires 32 and 33 of the wire interlocking mechanism WM, the right wire 33 is longer than the left wire 32.

As shown in FIGS. 4 and 13 to 15, the base of the cylinder barrel 26 of the hydraulic cylinder CY is provided on the bottom surface of the cross member 24 in front of the wire 33 in the vicinity of the block 33 b to which the right system wire 33 is bound. A wire inspection port 95 is opened on the end side . The wire access hole 95, on one side of the block 33 b side cutouts 95a formed of long holes for hooking the wire ends fitting 33m which will be described later, is continuously provided. The wire inspection port 95 is normally closed by an outer lid 96 fixed to the bottom surface of the cross member 24 with screws 97.

  As shown in FIGS. 4 and 13 to 15, one end of each of the wires 32 and 33 is bonded to the blocks 32 b and 33 b so as to be pulled out to the outside. Since the end structures of the wires 32 and 33 that can be pulled out are the same, the wire end structure of one of the wires 33 will be described with reference to FIG. The screw rod 33s is fixed via a wire end fitting 33m. The wire end fitting penetrates the block 32b, the screw rod 33s protrudes from the block 32b to the outside, and a double nut dn screwed there is engaged with the end face of the block 33b. As will be described later, after the wire 33 is relaxed, if the wire 33 is pulled as shown by the arrow a in FIG. 15A, the wire end fitting 33m is pulled out from the block 33b, and the wire 33 is pulled into the wire inspection port 95. Can be pulled out through. As shown in FIG. 15B, the end portion of the wire 33 drawn out from the block 33b is pulled out through the wire inspection port 95, and the wire end fitting 33m is hooked on the notch portion 95a. Can be locked in the pull-out position. Here, after adjusting the length of the wire 33 by screwing or unscrewing the double nut dn with respect to the screw rod 33s, the wire end fitting 33m is removed from the notch 95a, and the wire 33 is retracted. The end of the wire 33 is drawn into the cross member and bound to the block 33b.

  The power unit PU that drives and controls the hydraulic cylinder CY is located on the rear side of the cargo handling vehicle in one end portion of the cross member 24 (see FIG. 6), and is arranged in parallel with the hydraulic cylinder CY located on the front side thereof. The

  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. have summarized as a unit body, wherein are arranged disposed on one side of the hydraulic cylinder CY, it is Installing the bottom surface of the cross member 24.

The pump flange 50 provided with the gear pump 41 is fixed between the electric motor 40 and the oil tank 42, and is formed in a square flange shape. The motor cover of the electric motor 40, the tank cover of the oil tank 42, and Also used as a pump cover for the gear pump 41. As shown in FIG. 10, one end of the motor main body 40A is abutted against one end face of the pump flange 50 in the axial direction via a packing 52, and the electric motor 40 has a motor cover 40B at the outer end of the motor main body 40A. Is fixed to the pump flange 50 by a plurality of connecting bolts 51 that pass through the motor body 40A and are fastened to the outer periphery of the pump flange 50. Further, one end of the tank main body 42A is oil-tightly fitted to the disc-shaped protrusion 50A formed on the other end surface of the pump flange 50 through the packing 53, and the other end of the tank main body 42A is the valve block 43. via a packing 54 fitted oil-tightly to the inner end surface forming the disk-shaped projection 43A of tripartite pump flange 50, an oil tank 42 and the valve block 43, the outside of the tank body 4 2 a Fastened integrally with four tie rods 55 extending in the axial direction. One end of each tie rod 55 is screwed into each of 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 and is fixed to the valve block 43 by nuts 57. .

As shown in FIGS. 10 to 12, a gear pump 41 is fixed to the pump flange 50 on the central axis thereof. 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 gear pump 41 via a coupling 64. In the gear pump 41, a pump case 60 and a suction system 66 connected thereto are 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. At the top of the pump flange 50, the fuel supply port 71 for supplying oil to the oil tank 42, a breather 72 for Oh Irutanku 42 performs breathing it is provided.

  The recess provided in the discharge port of the gear pump 41 is connected to the discharge port of the gear pump 41 and the high-pressure pipe 70 by inserting one end of the high-pressure pipe 70. The high-pressure pipe 70 passes through the oil tank 42 vertically, By inserting the other end into a recess provided at the inlet of the valve block 43, the high pressure pipe 70 and the inlet of the valve block 43 are connected, and the pressurized oil from the gear pump 41 passes through the high pressure pipe 70 to the valve block 43. To be supplied. When the pump flange 50 and the valve block 43 are fastened and fixed by the tie rod 55, the high-pressure pipe 70 is supported at both ends 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

  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 formed integrally by arranging the electric motor 40, the gear pump 41, the oil tank 42, and the valve block 43 in series is elastically supported in the cross member 24. Hereinafter, the support structure will be described.

As shown in FIG. 5, a power unit accommodation space 75 is formed in the cross member 24 on one side (the vehicle rear side) of the hydraulic cylinder CY. The power unit PU is attached to the bottom surface of the cross member 24 in the power unit accommodation space 75. The power unit PU is attached to the bottom surface of the cross member 24. As shown in FIGS. 10 and 12, a rectangular base plate 76 having a channel shape in the cross section is attached to the mounting holes H2 and H2 ′ on the bottom surface of the cross member 24 via four anti-vibration rubbers 77. The power unit PU is installed and fixed on the base plate 76. As shown in FIGS. 10 and 12, one end side in the longitudinal direction of the base plate 76 is fastened to the pump flange 50 with two connecting bolts 77 a and 77 a fixed to the anti-vibration rubbers 77 and 77, respectively. Are fastened to nuts 77b and 77b embedded in vibration-insulating rubbers 77 and 77, respectively, so that the pump flange 50 is attached to the bottom surface of the cross member 24. is fixed through a rubber vibration isolator 77 and 77 together, also the other longitudinal end side of the base plate 76 (FIG. 10 right) was being respectively fixed to the rubber vibration isolator 77 and 77 through the base plate 76 2 The nuts 80 are fastened to the two connecting bolts 77a, 77a, and the two connecting bolts 79, through the mounting holes H2, H2 'on the bottom surface of the cross member 24, 9 buried nut 77b on rubber vibration isolator 77 and 77, by fastening to 77b, is fixed via vibration-proof rubber 77, 77 on the bottom surface of the cross member 24.

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

Oil pipe 90 connected to the discharge side of the valve block 43 is extended along the side of the power unit PU, is connected to the base of the hydraulic cylinder CY.

  As described above, the elevating cylinder CY and the power unit PU are attached to the cross member 24, respectively.

  As shown in FIGS. 4, 8, and 9, the corner portion between the rear surface and the lower surface of the cross member 24 is an inclined surface 24 a so that it does not interfere with the load loaded thereon when the load receiving platform 1 is raised. In addition, a safety bar 39 extending along the cross member 24 is supported at the lower rear surface of the cross member 24, and the operation of the power unit PU can be stopped in an emergency by operating the safety bar 39. ing.

  As shown in FIGS. 4 and 5, a contactor 44 connected to an electric circuit of the power unit PU is provided on one surface of the rib plate 25 which is welded to an end portion in the cross member 24 and to which the hydraulic cylinder CY is attached. It is fixed by. A terminal block T that connects the battery 49 and the main switch Sm in the cab is fixed to the left side of the front surface of the cross member 24 in the vehicle traveling direction.

FIG. 16 shows an electric and hydraulic system diagram of the power unit PU. In an electric circuit connecting the electric motor 40 and the vehicle battery 49, there are a main switch Sm provided in the driver's cab of the vehicle, and a control switch Sc arranged on the upper side of the lifting column 2 on the left side in the vehicle traveling direction (see FIG. 1). ) And the contactor 44 are connected. The electric motor 40 is connected to gear pump 41, the discharge side of the gear pump 41 is connected to the high pressure chamber of the hydraulic cylinder CY via a hydraulic pipe 91, also the suction side, to the oil tank 42 via the oil strainer 68 Connected. The upstream side of the hydraulic pipe 91 from the check valve 48 is connected to the oil tank 42 via the relief valve 47, and the downstream side of the hydraulic pipe 91 from the check valve 48 is a solenoid valve 45 and a flow control valve. The oil tank 42 is communicated with the fuel tank 42 through 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 on 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 returned to the oil tank 42 through the relief valve 47.

[Descent to 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, since the tension always acts on the left and right two wires 32 and 33 supporting the load receiving table 1 during the lifting operation of the load receiving table 1, according to the accumulation of the lifting operation of the load receiving table 1, The wires 32 and 33 are gradually stretched. In this case, there is a difference in the elongation of the two wires 32 and 33. For example, as described above, the right wire 33 having a longer overall length is larger than the wire 32 of the left wire. As a result, since the situation where the load receiving platform 1 is inclined in the left-right direction occurs, the lengths of the two wires 32 and 33 are adjusted.

  Next, a procedure for selecting the wire 33 and adjusting its length will be described with reference to FIGS.

  (1) As shown in FIG. 13A, after the load receiving platform 1 is raised to an appropriate height h1 by the extension operation of the hydraulic cylinder CY, a height h2 (height h1) is placed under the load receiving platform 1. Lower) cradle R.

  (2) Next, as shown in FIG. 13B, the load receiving platform 1 is lowered by the contraction operation of the hydraulic cylinder CY and placed on the receiving platform R. Thereby, tension does not act on the wires 32 and 33 of the two left and right systems.

  (3) Further, as shown in FIG. 14C, if the hydraulic cylinder CY continues to contract, loosening occurs in the two wires 32 and 33 of the left and right systems.

(4) where, FIG. 14 (D), the as shown in FIG. 15 (A) arrow a, then open the wire access hole 95 by removing the overcap 96, through the wire access hole 95 and pulling the wire 33 Then, the end of the wire 33 is pulled out from the cross member 24, and as shown in FIG. 15B, one end of the wire end fitting 33m is locked to the notch 95a. Thereby, the edge part of the wire 33 is latched by the drawing-out position.

(5) Next, as shown in FIG. 15 (B), (C), After rotational adjustment of the double nut dn which is screwed to the threaded rod 33s, disconnect the wire ends fitting 33 m from the notch portion 95 a Then, the double nut dn is locked to one end of the block 33b, and the adjustment work of the wire 33 is completed.

  (6) After completing the length adjustment of the wire 33, the wire inspection port 95 is closed with the outer lid 96.

  In the above (1) to (6), the length adjustment of the right system wire 33 has been described, but the length adjustment of the left system wire 32 can also be performed in the same manner.

  As described above, according to this embodiment, since the wire inspection port 95 capable of adjusting the lengths of the wires 32 and 33 is provided on the bottom surface of the cross member 24, the wires 32 and 33 can be attached while the wires 32 and 33 are assembled. The length can be adjusted.

Further, the wire access port 95, so that having a notch 95a that can engage the one end of the wire 32, 33 to be drawn therefrom, it is possible to temporarily fix the wire 32 to the lead position, the wire 32, The length adjusting operation 33 can be performed more easily.

  Further, since the wire inspection port 95 is provided on the bottom surface of the cross member 24, the wire inspection port 95 is outside the trajectory where the load receiving table 1 moves up and down, and the load receiving table is erroneously adjusted during the length adjustment of the wires 32 and 33. Even if 1 is moved up and down, there is no harm to the operator who adjusts the length of the wires 32 and 33, and the wire inspection port 95 is used to load and unload the load between the load receiving platform 1 and the cargo box V. Will not be affected.

  Furthermore, since a power unit PU for driving the elevating cylinder CY is provided in the cross member 24, maintenance of the power unit PU and adjustment of the lengths of the wires 32 and 33 are both performed from a close distance from the cross member 24. Can be carried out and their work efficiency can be improved.

  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-described embodiment, the case where the length of the right system wire 33 is adjusted has been described. However, the length of the left system wire 32 may be adjusted in the same manner. In the above-described embodiment, the elevating cylinder CY is arranged in parallel to the front side of the cargo handling vehicle and the power unit PU is arranged in parallel to the rear side thereof in the cross member 24. However, the hydraulic cylinder CY is arranged on the rear side of the cargo handling vehicle. You may arrange in parallel in the front side. 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.

The side view of the cargo handling vehicle provided with the present invention loading 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. Exploded perspective view of the main part of the power unit Diagram showing the wire drawing process Diagram showing the wire drawing process Diagram showing the wire length adjustment process Operational circuit diagram of the loading platform lifting device

1 Loading platform 2 Lifting column 24 Cross member 31l movable sheave (left movable sheave)
31r movable sheave (right movable sheave)
26 Cylinder barrel
27 Cylinder rod
30 Bracket 32 Wire (Left system)
33 wire (right system)
34 l fixed sheave (left side fixed sheave)
34r fixed sheave (right side fixed sheave)
35 fixed sheave (right side fixed sheave)
36 fixed sheave (left top fixed sheave)
37 fixed sheave (right top fixed sheave)
95 Wire inspection port 95a Notch F Body frame CY Lift cylinder (hydraulic cylinder)
PU power unit WM Wire interlocking mechanism

Claims (4)

A pair of elevating columns (2) erected integrally with a gap to the body frame (F), a cross member (24) fixed laterally between the pair of elevating columns (2), and a pair of elevating A load receiving base (1) provided on the column (2) so as to be movable up and down, a lifting cylinder (CY) provided in the cross member (24), and a wire for interlockingly connecting the lifting cylinder (CY) and the load receiving base (1). An interlocking mechanism (WM) is provided, and the load receiving platform (1) can be moved up and down along the pair of lifting columns (2, 2) via the wire interlocking mechanism (WM) by the expansion and contraction operation of the lifting cylinder (CY). , In the loading platform lifting device of the cargo handling vehicle,
The wire interlocking mechanism (WM) includes two wires (32; 33) of different lengths, one end of which is connected to the cross member (24) and the other end is connected to the load receiving table (1), The movable sheave (31l; 31r) and the fixed sheave (34l, 36; 34r, ) for guiding the wire (32; 33) from the lifting cylinder (CY) to the load receiving platform (1) through the pair of lifting columns (2, 2) . 35, 37),
The elevating cylinder (CY) extends in the longitudinal direction in the cross member (24), and has a bracket (30) provided with the movable sheave (31l; 31r) at the tip of a cylinder rod (27) that is expanded and contracted. ) And a wire inspection port (95) that can adjust the length of the wire (32; 33) on the proximal end side of the cylinder barrel (26) of the elevating cylinder (CY). An end of the wire (32; 33) fixed to the cross member (24) on the side of the cylinder barrel (26) through the wire inspection port (95) can be drawn out. A loading platform lifting device for a cargo handling vehicle.   The load receiving base for a cargo handling vehicle according to claim 1, wherein the wire inspection port (95) has a notch (95a) capable of locking one end of the wire (32; 33) drawn out therefrom. lift device.   The cargo receiving platform lifting / lowering device for a cargo handling vehicle according to claim 1 or 2, wherein the wire inspection port (95) is provided on a bottom surface of the cross member (24).   4. The cargo receiving platform lifting device for a cargo handling vehicle according to claim 1, wherein a power unit (PU) for driving the lifting cylinder (CY) is provided in the cross member (24). .

Images