JP4188291B2 - Cargo handling vehicle - Google Patents

Description

  The present invention relates to a cargo handling vehicle equipped with a detachable container that allows a container mounted on a chassis to be loaded and unloaded between the chassis and the ground.

Conventionally, a lift arm 4 is pivotally supported by a cargo handling frame 1 mounted on a chassis F so as to be able to swing up and down, and a hook arm 5 is provided at the tip of the lift arm 4 so as to be able to rotate back and forth. A hook 6 is provided at the tip of the hook arm 5, the hook 6 is detachably engaged with the engaging portion 17 of the container Ct, and the lift arm 4 is swung up and down to move the container Ct forward and backward. 2. Description of the Related Art A cargo handling vehicle having a detachable container that is lowered from the ground 1 onto the ground or loaded with a ground container Ct onto the cargo handling frame 1 is known (see Patent Document 1).
JP 2000-62517 A

  By the way, in the cargo handling vehicle disclosed in Patent Document 1, when the container installed on the ground is loaded into the cargo handling vehicle, the hook of the hook arm tip is engaged with the engagement portion of the container, and then the lift arm The container is loaded onto the cargo handling frame on the chassis by rotating it forward together with the hook arm. In such loading operation, the hook on the hook arm tip is well engaged with the engaging part of the container. If the operation to be combined is troublesome, for example, if the distance between the hook at the tip of the hook arm and the engaging portion of the container becomes too long and the hook does not reach the engaging portion of the container, the lift arm Since the hook arm swinging operation is also required in addition to the pivoting operation, the hook engaging operation with the container engaging portion becomes complicated, and the work efficiency when loading the container decreases. There is a cormorant problem.

  The present invention has been made in view of such circumstances, and the hook at the tip of the hook arm can be accurately engaged with the lift bar of the container without performing the swinging operation of the hook arm by the backward rotation operation of the lift arm. Thus, an object of the present invention is to provide a new cargo handling vehicle capable of greatly improving the work efficiency when loading containers.

In order to achieve the above object, a first aspect of the present invention is that a lift arm is pivotally supported by a cargo handling frame mounted on a chassis so as to be able to undulate back and forth, and a lift bar of a container is provided at the front end of the lift arm. A hook arm having a hook that can be engaged and disengaged is provided, and the container can be loaded and unloaded between the cargo handling frame and the ground by turning the lift arm up and down, and guided to the front of the front of the hook arm in the cargo handling vehicle. The guide member is provided with a circular arc surface substantially concentric with the center of rotation of the lift arm,
The arc surface and the lift bar of the container are brought into contact with each other by the rearward rotation of the lift arm, and the movement of the hook arm is guided by the relative sliding of the arc surface and the lift bar based on the subsequent forward rotation of the lift arm. The hook is engaged with a lift bar.

  In order to achieve the above object, the invention according to claim 2 is the invention according to claim 1, wherein the upper end of the arc surface at the rearward rotation end position of the lift arm is from a lift bar of a container installed on the ground. Is also in the upper position.

  Furthermore, in order to achieve the above object, the invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the guide member is provided with a confirmation member that an operator can visually check from the operator's cab. Yes.

  According to the first aspect of the present invention, when the container on the ground is loaded onto the cargo handling vehicle, the hook of the hook arm can be accurately engaged with the lift bar of the container by rotating the lift arm. Since troublesome swing control is not required, the loading efficiency of the container into the chassis can be increased.

  According to the second aspect of the present invention, the upper end of the circular arc surface at the rearward rotation end position of the lift arm is located above the lift bar of the container installed on the ground, so that the guide member is engaged with the lift bar. In addition, it is not necessary to perform further rotation adjustment from the rearward rotation end position of the lift arm, and the loading efficiency of the container onto the chassis can be further increased.

  According to the invention of claim 3, when the lift arm is rotated backward to move the guide member to the engagement position of the lift bar, the operator visually confirms the confirmation member from the driver's cab and thereby the guide member. Since the position of the lift arm can be confirmed, the lift arm can be reliably stopped at the engagement position, and at that time, the lift arm does not have to be fully rotated to the rearward rotation end position. The hook can be engaged with the lift bar in time. Further, since the confirmation member is provided on the guide member, the assembly work is facilitated.

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

  FIGS. 1 to 8 show a first embodiment of the present invention. FIG. 1 is a side view of a cargo handling vehicle showing a state at the time of completion of container loading (running), and FIG. 2 is immediately before the start of container loading. FIG. 3 is a side view of a cargo handling vehicle showing a state in which the container is being loaded, FIG. 4 is a side view of the cargo handling vehicle showing a state when the container is dumped, and FIG. 5 is an enlarged plan view taken along arrow 5 in FIG. 1, FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 5, FIG. 7 is an enlarged view of a portion surrounded by an imaginary line in FIG. FIG. 8 is an enlarged view taken along line 8-8.

  1 to 8, a cab Ca is provided in a front portion of a chassis F of the cargo handling vehicle V, and the cargo handling frame 1 is integrally mounted on the chassis F behind the cab Ca. The cargo handling frame 1 is formed in a rectangular frame shape with left and right vertical girders and a plurality of horizontal girders, and left and right guide rollers 2 and 2 are rotatably pivoted on the left and right rear ends thereof. The rollers 2 and 2 guide and guide a container Ct described later that is detachably mounted on the cargo handling frame 1. A dump arm 3 is provided at the rear of the cargo handling frame 1 so as to be tiltable rearward. This dump arm 3 is formed in a foreground in a plan view with the front end open by forming a horizontal girder integrally at the rear ends of the left and right vertical girders, the rear end of which is the same axis as the rotation axis of the left and right guide rollers 2 and 2. It is pivotally supported so that it can tilt in the front-rear direction. A rear end, that is, a base end of a lift arm 4 made of a single rectangular cylinder is pivotally supported 9 at a middle portion near the front end portion of the dump arm 3 so as to be able to swing up and down in the front-rear direction. Yes. The lift arm 4 extends in the front-rear direction at the left and right intermediate part of the cargo handling frame 1, and the rear part overlaps the dump arm 3 in the front-rear direction, but most of the lift arm 4 extends forward from the dump arm 3. Yes. Between the front part of the cargo handling frame 1 and the intermediate part of the lift arm 4, a pair of lift cylinders 7, 7 composed of drive means, that is, a backward hydraulic cylinder, is connected. 7, the left and right sides of the lift arm 4 extend in the front-rear direction. As shown in FIGS. 2 and 3, the lift arm 4 is moved back and forth around the pivot center 9, that is, around the shaft support 9, as shown in FIGS. It can be swung up and down.

  The base end of the hook arm 5 is connected to the front end of the lift arm 4 so as to be rotatable in the front-rear direction. The hook arm 5 is formed in an L shape when viewed from the side, and a hook 6 is integrally provided at the upper end thereof. The hook 6 is detachable from a lift bar 17 provided at the upper front of the container Ct.

  As clearly shown in FIGS. 7 and 8, a guide member G according to the present invention is fixed to the front surface of the front portion of the hook arm 5. The guide member G is formed in a T-shaped cross section and includes an attachment portion 20 to the hook arm 4 and a guide portion 21 that stands up integrally there from. The mounting portion 20 is fixed to the front surface of the front portion of the hook arm 4 by a plurality of bolts 22, and the front surface of the guide portion 21 is substantially concentric with the center of rotation of the lift arm 4, that is, the shaft support 9. A circular arc surface 23 having a radius R (see FIG. 7) that is substantially concentric with the portion is formed along the longitudinal direction of the hook arm 5. The distal end of the guide member G extends to the vicinity of the hook 6 and, as will be described later, when the lift arm 4 is at the rearward rotation end position, the guide member G is reversed and its proximal end (upper end) ) Is set to a position above the lift bar 17 of the container Ct installed on the ground GR.

  Between the front part of the lift arm 4 and the intermediate part of the hook arm 5, a hook cylinder 8 comprising a driving means of the hook arm 5, that is, a backward hydraulic cylinder, is connected. Thus, the hook arm 5 can be swung up and down in the front-rear direction of the chassis F, whereby the container Ct can be moved rearward on the cargo handling frame 1.

  As shown in FIGS. 5 to 7, the lift arm 4 and the dump arm 3 are fixed to the left and right sides of the lift arm 4, the hook arm 5, and the dump arm 3 in a straight line in the front-rear direction. A pair of left and right lashing mechanisms L are provided to tie up and release the lashes. Each lashing mechanism L includes a lashing hook 10 that is pivotally supported on one side of the rear part of the lift arm 4 and a lashing hook 10 that is provided on one side of the front end of the dump arm 3 so that the tying hook 10 can be freely detached. A locked portion 11 that can be engaged and a rod 12 that can be adjusted in length to pin-connect the intermediate portion of the lashing hook 10 and the proximal end of the hook arm 5 are shown in FIG. Thus, when the hook arm 5 is in the standing position, that is, the retracted position, the rod 12 is pushed rearward, and the lashing hook 10 is rotated in the lashing direction to engage with the locked portion 11, thereby lifting The arm 4 and the dump arm 3 are tied together in a straight line in the front-rear direction. When the hook arm 5 is rotated backward (FIG. 3, solid line and chain line position) by the extension operation of the hook cylinder 8, the rod 12 is pulled forward (FIG. 6, left direction), and the securing hook 10 Is pivoted in the unlocking direction (FIG. 6, clockwise) and disengaged from the locked portion 11, thereby releasing the lock between the lift arm 4 and the dump arm 3. Separate rotations are allowed.

  As shown in FIGS. 1 to 4, an outrigger 15 is provided at the rear portion of the chassis F, and this outrigger 15 is actuated to stabilize the cargo handling vehicle V when the container Ct is loaded or unloaded.

  On the other hand, the container Ct mounted on the chassis F of the cargo handling vehicle V is formed in a box shape with a lid, both sides of the front surface thereof are reinforced by reinforcing girders 14, and the opened rear surface is closed by a rear gate 16, and An engaging portion, that is, a lift bar 17 that can be engaged with and disengaged from the hook 6 of the hook arm 5 is provided on the upper portion of the front wall, and a plurality of traveling wheels 18 made of casters are pivotally supported on the front and rear of the bottom portion. .

  Next, the operation of the first embodiment will be described.

  As shown in FIG. 1, when the hook arm 5 is tilted rearward by the extension operation of the hook cylinder 8 from the state in which the container Ct is loaded on the chassis F of the cargo handling vehicle V (the vehicle traveling state), the container Ct is The left and right guide rollers 2 and 2 are pushed rearward by the hook arm 5 and moved rearward. As the hook arm 5 continues to rotate backward, the lashing mechanism L is released as described above, and the lift arm 4 and dumper are released. Since the fixation with the arm 3 is released, the lift arm 4 can freely rotate with respect to the dump arm 3. Next, when the lift cylinder 7 is extended, the lift arm 4 tilts together with the hook arm 5. As a result, the container Ct is guided by the left and right guide rollers 2 and 2 to move rearward on the chassis F, the container Ct is tilted rearward with the rotation center of the left and right guide rails 2 and 2 as a fulcrum, and the rear lower edge thereof (See FIG. 3).

  When the lift cylinder 7 continues to extend and extends to the rearmost rotation end position (solid line position in FIGS. 2 and 7), the hook arm 5 is directed downward and the container Ct is lowered to the ground GR. If the hook 6 at the tip of the hook arm 5 is removed from the lift bar 17, the container Ct is separated from the cargo handling vehicle V.

  If the lift cylinder 7 is extended while the container Ct is mounted on the cargo handling frame 1, that is, the hook arm 5 is in the retracted position (the state shown in FIGS. 1 and 5), the securing mechanism L is Since the dump arm 3 and the lift arm 4 are integrally secured while maintaining the secured state, as shown in FIG. 4, the arms 3 and 4 are integrally tilted rearward and the container Ct is moved. The dump can be raised and the contents in the container Ct can be discharged to the outside. Further, if the lift cylinder 7 is contracted, the container Ct can be dumped down and lowered onto the cargo handling frame 1.

  The above-described work for lowering and dumping the container Ct is the same as that for a conventional cargo handling vehicle.

  Next, the process of loading the grounded container Ct onto the chassis F will be described with reference to FIGS.

  a. After the cargo handling vehicle V is stopped in tandem at an appropriate interval in front of the container Ct lowered to the ground, the lift arm 4 is fully rotated to the rear end position together with the hook arm 5. This rotation operation is the same as the case of the above-described operation of lowering the container Ct.

  b. Next, as shown by the solid lines in FIGS. 2 and 7, the cargo handling vehicle V is moved backward, and the arc surface 23 of the guide member G on the front surface of the front portion of the hook arm 5 is brought into contact with the lift bar 17 of the container Ct. At this time, the hook 6 at the tip of the hook arm 5 does not hit the front wall of the container Ct. Further, the upper end of the arc surface 23 when the lift arm 4 is rotated to the rearward rotation end position is set at a position higher than the lift bar 17 of the container Ct, so that the lift arm 4 is adjusted for rotation. There is no need to do it.

  c. Next, the lift arm 4 is rotated forward together with the hook arm 5 by the contraction operation of the lift cylinder 7. At this time, since the arc surface 23 of the guide member G is formed on the center of rotation of the lift arm 4, that is, the arc surface 23 substantially concentric with the shaft support 9 portion, The arm 5 smoothly moves upward along an arc trajectory along the arc surface 23 while being guided by relative sliding between the arc surface 23 of the guide member G and the lift bar 17, and the hook 6 is moved to the lift bar 17 of the container Ct. Can be accurately engaged.

  d. According to the subsequent forward rotation of the lift arm 4, as shown in the chain line position from the solid line position in FIG. 3, the container Ct is loaded on the cargo handling frame 1 and moved forward, and finally the hook cylinder 8 is moved. By the contraction operation, the hook arm 5 rotates to the retracted position, and the loading of the container Ct into the cargo handling vehicle V is completed as shown in FIGS.

  As described above, when the container Ct on the ground is loaded on the cargo handling vehicle, the lift arm 4 is engaged with the lift bar 17 of the container Ct by the pivoting operation to the rear pivot position. At that time, it is not necessary to control the swinging of the hook arm 5, and further, it is not necessary to adjust the rotation of the lift arm 4, so that the loading efficiency of the container Ct into the cargo handling frame 1 is greatly improved. .

  Next, a second embodiment of the present invention will be described.

  9 to 11 show a second embodiment of the present invention, FIG. 9 is a view corresponding to FIG. 7 of the first embodiment, and FIG. 10 is an enlarged cross section taken along line 10-10 of FIG. FIGS. 11A and 11B are sectional views taken along line 11-11 in FIG. 10, and the same components as those in the first embodiment are denoted by the same reference numerals.

  The second embodiment differs from the first embodiment in the configuration of the guide member G according to the present invention. As shown in FIGS. 10 and 11, the left and right sides of the mounting portion 20 of the guide member G protrude from the lateral width of the tip portion of the hook arm 5 to the left and right and are bent at a substantially right angle toward the hook arm 5. The members 25 and 25 are integrally formed, and these left and right confirmation members 25 and 25 are in contact with the left and right outer surfaces of the hook arm 5. As shown in FIG. 10, the left and right confirmation members 25, 25 have substantially the same length in the vertical direction along the hook arm 5 as that of the guide member G. In addition, the lower end portions 25u, 25u, 25d, 25d Is substantially coincident with the positions of the upper and lower ends of the guide member G. The outer surfaces of these left and right confirmation members 25, 25 are colored 26, 26 by applying paint or the like in a color different from the side surface of the hook arm 5.

  As described above, the left and right confirmation members 25, 25 protrude outward from the left and right outer surfaces of the hook arm 5, and are colored 26, 26 in a color different from the color of the side surface of the hook arm 5. Thus, the operator can clearly confirm the left and right confirmation members 25, 25 visually from within the cab Ca.

  In the loading process of the container Ct lowered to the ground onto the chassis F, as shown in FIG. 9, the lift arm 4 is rotated together with the hook arm 3 to the vicinity of the rear end position (in this case, the lift arm 4 is moved to the rear end position). It does not have to be fully rotated to the position). Next, when the guide member G is moved to the engagement position with the lift bar 17 by retreating the cargo handling vehicle V, the operator looks at the rear from the inside of the cab Ca and visually confirms the position of the confirmation member 25. Then, it is visually confirmed that the lift bar 4 is rotated backward until the lift bar 17 of the container Ct is positioned between the upper end 25u and the lower end 25d of the confirmation member 25, and the backward rotation is stopped. .

  Thereafter, as with the first embodiment, as the lift arm 4 rotates forward, the hook arm 5 is guided by the guide member G, the hook 6 engages with the lift bar 17, and the lift arm 4 continues to rotate forward. Thus, the container Ct is loaded into the cargo handling frame 1 on the chassis F.

  Thus, according to the second embodiment, the hook 6 can be accurately engaged with the lift bar 17 without fully rotating the lift arm 4 to the rearward rotation end position. 17 can be engaged in a short time. Further, since the confirmation member 25 is provided on the guide member G, the assembling work is facilitated.

  In the second embodiment, the confirmation member 25 may be provided only on one side of the mounting portion 20 of the guide member G.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and various embodiments are possible within the scope of the present invention.

  For example, in the above-described embodiment, the case where the present invention is applied to a cargo handling vehicle that can dump and unload containers between the chassis and the ground is described. The hook arm may be slidable back and forth on the cargo handling frame, and may be integral with the lift arm.

Side view of the cargo handling vehicle showing the state when the container is completely loaded (running) (first embodiment) Side view of the cargo handling vehicle showing the state just before the start of container loading Side view of a cargo handling vehicle showing the state during container loading Side view of the cargo handling vehicle showing the state when the container is dumped Fig. 5 is an enlarged plan view taken in the direction of arrow 5 Sectional drawing which follows the 6-6 line of FIG. Enlarged view of the phantom line encircled portion shown in FIG. Enlarged view along line 8-8 in FIG. The figure corresponding to FIG. 7 of 1st Example (2nd Example) FIG. 9 is an enlarged sectional view taken along line 10-10. Sectional drawing which follows the 11-11 line of FIG.

Explanation of symbols

1 ······ Loading frame 4 ···················································································· ··············································································································· ······ Ca Ca ························· Container G Above the ground

Claims (3)

A lift arm (4) is pivotally supported (9) on a cargo handling frame (1) mounted on a chassis (F) so that it can be swung up and down, and a container ( A hook arm (5) having a lift bar (17) of Ct) and a hook (6) that can be engaged and disengaged is provided, and the container (Ct) is moved up and down by lifting and lowering of the lift arm (4). In a cargo handling vehicle that can be loaded and unloaded with GR)
A guide member (G) is provided on the front surface of the tip of the hook arm (5), and an arc surface (23) substantially concentric with the center of rotation of the lift arm (4) is formed on the guide member (G). ,
By rotating the lift arm (4) backward, the circular arc surface (23) and the lift bar (17) of the container (Ct) are brought into contact with each other, and then the circular arc surface (based on the forward rotation of the lift arm (4) ( 23) and the lift bar (17) relative to each other to guide the movement of the hook arm (5) so that the hook (6) is engaged with the lift bar (17). Cargo handling vehicle.   The upper end of the circular arc surface (23) at the rearward rotation end position of the lift arm (4) is located above the lift bar (17) of the container (Ct) installed on the ground (GR). The cargo handling vehicle according to claim 1. 3. The cargo handling vehicle according to claim 1 or 2, wherein the guide member (G) is provided with a confirmation member (25) that can be viewed by an operator from the cab (Ca).

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