JP4204907B2 - Crane car jib storage device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a jib storage device for a crane truck.
[0002]
[Prior art]
As a method of storing a jib of a crane vehicle, Patent Document 1 discloses a method in which an auxiliary winding wire and a spare wire are used to draw the jib to the lower surface of the boom and the jib and the boom are fixed with an automatic lock pin. is there.
In this method, after the boom is raised and the jib is suspended from the tip of the boom, a spare wire is connected to the tip of the auxiliary winding wire, and the tip of the spare wire is connected to the boom base via the sheave at the jib tip. The auxiliary wire is pulled up to pull the auxiliary wire and draw the jib, and the jib is stored on the lower surface of the boom.
However, such a method has the disadvantage that field work is required for connecting the spare wire and the like, and that the spare wire connection and detachment work itself is troublesome.
[0003]
In view of this, a jib storage device as disclosed in Patent Document 2 has been proposed as an apparatus in which troublesome outdoor work using a spare wire is eliminated and the jib can be stored by an operation from the driver's seat.
In this jib storage device, in the same manner as described above, with the boom raised and the jib hanging from the boom tip, the guide roller provided on the jib is engaged with the guide fixed to the boom, and the boom tip is further retracted. By moving the guide roller along the slope of the guide, the jib is pulled and fixed to the lower surface of the boom.
However, in reality, there is a problem that the main winding wire that suspends the main hook is slackened due to the retracting operation of the boom tip due to the crane structure, and the main hook is prevented from shaking and interfering with the movable part. Needless to say, the winding operation of the main winding wire must be performed in synchronism with the contraction of the boom, and inconvenience remains in terms of the complexity of lever operation and the like.
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 51-46779 (2nd page, upper right column)
[Patent Document 2]
JP 2000-44173 (paragraph numbers 0023, 0024, FIG. 6)
[0005]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to eliminate the drawbacks of the prior art and to store a jib by a simple operation from the driver's seat without requiring wire connection work or field work. Is to provide.
[0006]
[Means for Solving the Problems]
The present invention is a jib storage device for a crane vehicle comprising a jib pivotally attached to a boom tip, and a main hook suspended from a main winding wire hung on a main winding wire top sheave at the boom tip. Yes, in order to achieve the above problem,
A swing member provided with a main hook contact surface is provided at the tip of the swing member main body, and is offset from the normal passing through the center of the main hook contact surface toward the boom tip so as to be separated from the main hook contact surface. A pivot part for attaching the swing member to the boom is formed at a position on the swing member main body.
A pivot member is pivotally pivoted via the pivot portion at a position on the boom closer to the boom tip than the pivot position of the main winding wire top sheave,
The swing member has a configuration characterized in that a pressurizing portion for pressing a pressure receiving portion formed on the jib is provided.
[0007]
In storing the jib at the tip of the boom in the above configuration, first, as in the prior art, the boom is raised and the jib is suspended from the boom tip, so that the jib is close to the bottom surface of the boom.
Next, the main winding wire winch is driven to start winding the main winding wire, and the main hook suspended from the main winding wire hung on the main winding wire top sheave is raised.
As the main hook rises, it is pivotally attached to the boom at a position closer to the boom tip than the pivot attachment position of the main winding wire top sheave, and the weight of the main hook abuts the main hook contact surface fixed to the tip. The main hook comes into contact with the main hook contact surface of the swinging member that holds the posture directed downward.
The swinging member has a pivoting portion formed at a position on the swinging member main body that is offset in a direction from the normal passing through the central portion of the main hook contact surface toward the tip of the boom and separated from the main hook contact surface. Through which the main wire wire top sheave is pivotally attached to the boom at a position closer to the boom tip than the pivot attachment position, and the main hook lifting force is a line connecting the main wire top sheave and the main hook, That is, since it acts along the normal passing through the center of the main hook contact surface, the force acting on the swing member when the main hook contacts the main hook contact surface is The main hook contact surface at the tip of the swinging member works in a direction to swing toward the lower surface side of the boom.
Therefore, as the main hook is raised, the swing member gradually swings toward the lower surface side of the boom, and the pressurizing portion provided on the swing member comes into contact with the pressure receiving portion formed on the jib. Press this.
As a result, the jib pivotally attached to the boom tip is further swung from the state approaching the bottom surface of the boom toward the bottom surface of the boom and positioned at the retracted position.
Finally, the drive of the winch for the main winding wire is stopped in a state where the conventionally known automatic lock pin or the like is operated and the jib is fixed to the lower surface of the boom, and the jib storing operation is completed.
As described above, since the operation required for storing the jib is only the winding operation of the main winding wire, that is, the driving operation of the winch for the main winding wire, it is an extremely simple operation from the driver's seat. The jib can be stored, and no field work including wire connection is required at this time.
[0008]
In addition, regarding the structure of the pressure receiving part and the pressurizing part, at least one of the pressure receiving part and the pressurizing part is constituted by a rotatable roller, and swings in a state where the jib swings to the preliminary storage position approaching the lower surface of the boom When the member is swung toward the lower surface of the boom, it is desirable that the pressure receiving part and the pressure applying part are arranged at positions where they abut against each other.
[0009]
As described above, the swinging center of the swinging member is located closer to the boom tip than the pivoting position of the main winding wire top sheave, and the jib swinging center is coaxial with the main winding wire top sheave or Because it is in the vicinity, if both of the rocking members are swung while the pressure member of the rocking member is in contact with the pressure receiving portion of the jib, the pressure member and the pressure receiving portion are in pressure contact with each other. Occurs. By constituting at least one of the pressure receiving part and the pressure applying part with a rotatable roller, damage such as galling and wear that may occur due to relative movement in the pressure contact state can be prevented.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing a main part of a jib storage device for a crane truck of an embodiment to which the present invention is applied, and FIG. 2 is a side view showing the entire structure of the crane including the jib storage device of the embodiment. FIG. 5 is a side view showing the external appearance of a crane vehicle equipped with a crane equipped with a jib storage device.
[0011]
First, the overall structure of the crane 1 will be briefly described with reference to FIG.
[0012]
The crane 1 includes a telescopic structure boom 2 that is expanded and contracted by a hydraulic cylinder (not shown), and a jib 3 that is attached to the boom 2.
[0013]
A main winding wire top sheave 4 is pivotally attached to the tip of the boom 2. From the main winding winch 7 disposed on the crane vehicle 6 side shown in FIG. 5, the guide roller 8 and the main winding wire guide sheave are arranged. The main winding wire 9 guided through 5 is wound around the main winding wire top sheave 4, and the main hook 10 is suspended by the main winding wire 9.
[0014]
Further, an auxiliary winding wire 13 as shown in FIG. 5 is wound around the auxiliary winding wire top sheave 11 and the auxiliary winding wire guide sheave 12. In FIG. 2, the path of the main winding wire 9 is clearly shown. For the sake of necessity, the description of the auxiliary winding wire 13 is omitted.
[0015]
The jib 3 has a bifurcated base, is pivotally mounted coaxially with the main winding wire top sheave 4, and is swingable with respect to the boom 2. A sheave 14 for rotating the auxiliary winding wire 13 is pivotally attached to the tip of the jib 3, and a sub hook 15 as shown in FIG. 5 is suspended from the auxiliary winding wire 13 led out of the sheave 14. It is like that.
[0016]
A cylinder bottom of a hydraulic cylinder 16 that functions as a tension rod capable of adjusting the sheave offset angle is pivotally attached to the tip of the jib 3, and the piston rod 17 is in a state where the jib 3 is raised with respect to the boom 2. The rising end of the jib 3 is maintained by pivotally attaching the tip to the rod fixing bracket 18 at the tip of the boom 2 with a pin via a tension rod body.
[0017]
A locking piece 19 for fixing the jib 3 in a folded state protrudes on the back surface side of the jib 3, while the corresponding position on the lower surface side of the boom 2 can be remotely operated automatically. A lock pin 20 is provided, and the folding fixed state of the jib 3 is ensured by fitting the locking piece 19 and the automatic lock pin 20.
[0018]
As shown in FIG. 5, the base of the boom 2 is pivotally attached to the revolving body 21 of the crane 6, and is located between the staple 22 fixed on the lower surface of the boom 2 and the revolving body 21. 2 can be adjusted freely with the posture shown in FIG. 2 as the upper limit and the posture shown in FIG. 5 as the lower limit. Yes.
[0019]
Next, with reference to FIG. 1, the structure of the jib storage device 23 of the crane vehicle unique to this embodiment will be described in detail.
[0020]
The main part of the jib storage device 23 includes a swing member main body 24a pivotably attached to the boom 2 and a main hook contact surface 24b formed at the tip of the swing member main body 24a. The swing member 24 is used.
[0021]
A slit (not shown) that allows passage of the main winding wire 9 on which the main hook 10 is suspended is formed at the center of the main hook contact surface 24b provided at the tip of the swing member main body 24a. While the main hook 10 is allowed to move up and down by the winding and unwinding operation of the main winding wire 9, when the main hook 10 is raised to the limit by the winding operation of the main winding wire 9, the base portion of the main hook 10 is moved toward the main hook. It contacts the lower surface side of the contact surface 24b.
[0022]
The swinging member main body 24a is pivotally attached to a position that is offset in the direction B from the normal A passing through the center of the main hook contact surface 24b toward the tip of the boom 2 and that is separated from the main hook contact surface 24b. A portion 25 is formed, and the swing member 24 swings with respect to the boom 2 at a position closer to the tip of the boom 2 than the pivot attachment position 26 of the main winding wire top sheave 4 via the pivot attachment portion 25. It is pivotally attached.
[0023]
In addition, a dock 27 that functions as a pressure receiving portion is integrally fixed to one side of the base portion of the bib 3 that is divided into two forks, and on one side of the swing member main body 24 a that constitutes a part of the swing member 24. A roller 28 functioning as a pressure unit for pressing the dock 27 is pivotally mounted. The dock 27 is fixedly provided so as to protrude to the inside of the base portion of the bifurcated jib 3, and the roller 28 pivotally attached to one side of the swing member main body 24 a can come into contact with the dock 27. In addition, it is disposed so as to protrude to one side of the swing member main body 24a as long as it does not interfere with the inside of the bifurcated jib 3.
[0024]
The dock 27 on the jib 3 and the roller 28 on the swinging member main body 24a are arranged at a preliminary storage position where the jib 3 approaches the lower surface of the boom 2, that is, as shown in FIG. The jib 3 is disposed at a position where the jib 3 is vertically abutted from the pivoting position 26 and swings the swinging member 24 further toward the lower surface of the boom 2 in FIG. Thus, the roller 28 presses the dock 27.
[0025]
Next, with reference to FIGS. 2 to 4, the storage work of the jib 3 using the jib storage device 23 will be described.
[0026]
When the jib 3 is stored, first, as shown in FIG. 2, the boom 2 is raised to an angle of about 70 ° and the jib 3 is suspended from the tip of the boom 2, and the jib 3 approaches the lower surface of the boom 2. Preliminary storage state.
[0027]
In this operation, the boom 2 and the jib 3 are once laid down and the auxiliary winding wire 13 is attached to the tip of the jib 3 and then the piston rod 17 of the hydraulic cylinder 16 functioning as a tension rod, the tension rod body, and the rod fixing as in the conventional operation. The engagement with the bracket 18 is released, and the boom 2 and the jib 3 are bent in an inchworm shape by rewinding the auxiliary winding wire 13 while raising the boom 2 by the extension operation of the boom hoisting cylinder.
[0028]
2, the winding of the main winding wire 9 that suspends the main hook 10 is not started, and the lower surface of the main hook contact surface 24b of the swing member 24 and the base portion of the main hook 10 are not There is a certain gap between them, and only the gravity acts on the jib 3. Accordingly, as shown in FIG. 2, the jib 3 is held vertically suspended from the pivoting position 26 by its own weight, and the swinging member 24 is also removed from the pivoting part 25 by its own weight. It is held in a vertically suspended state.
[0029]
Next, when the operator drives the main winding winch 7 by an operation from the driver's seat and starts winding the main winding wire 9, the main hook 10 gradually rises, as shown in FIG. The base portion of the main hook 10 comes into contact with the main hook contact surface 24b of the swinging member 24 that holds the posture in which the contact surface 24b faces downward.
[0030]
The swing member 24 is pivotally attached to the boom 2 at a position closer to the tip of the boom 2 than the pivot attachment position 26 of the main winding wire top sheave 4, and the force to raise the main hook 10 is the top of the main winding wire top. Since it acts along the line connecting the sheave 4 and the main hook 10, that is, along the normal A passing through the center of the main hook contact surface 24b, the base portion of the main hook 10 contacts the main hook contact surface 24b. The force acting on the swinging member 24 by contact is the direction in which the main hook contact surface 24b at the tip of the swinging member 24 swings toward the lower surface side of the boom 2 around the pivoting portion 25, that is, in FIG. Will work counterclockwise.
[0031]
Therefore, as the main hook 10 is raised, the swing member 24 gradually swings toward the lower surface side of the boom 2, and the roller 28 provided on the swing member 24 comes into contact with the dock 27 on the jib 3. Press this.
[0032]
As a result, the jib 3 pivotally mounted coaxially with the main winding wire top sheave 4 swings further from the preliminary storage position as shown in FIGS. 2 and 3 toward the lower surface side of the boom 2. 4 is positioned at the storage position as shown in FIG.
[0033]
At this time, the main winding winch 7 is driven in a state in which the driving torque is limited as compared with the case of normal cargo handling work, thereby preventing damage to each part of the mechanism that may occur due to excessive tension of the main winding wire 9. can do.
[0034]
Finally, the automatic lock pin 20 on the boom 2 side is operated to lock the locking piece 19 of the jib 3 so that the jib 3 is fixed to the lower surface of the boom 2 and the driving of the main winding winch 7 is stopped. The jib 3 storage operation is completed.
[0035]
The operation required for storing the jib 3 is only the driving operation of the main winding winch 7 required for winding the main winding wire 9, and this operation can be easily performed by lever operation from the driver's seat. As a result, field work by the operator is greatly reduced.
[0036]
Since the pivoting portion 25 serving as the pivot center of the swing member 24 is located closer to the tip of the boom 2 than the pivot position of the jib 3, the roller 28 of the swing member 24 contacts the dock 27 of the jib 3. When the swinging member 24 and the jib 3 are swung in the state of being moved, relative movement occurs between the roller 28 and the dock 27, and the roller 28 is placed on the slope of the dock 27 as shown in FIGS. 3 and 4. The roller 28 is attached to the swinging member 24 in a rotatable state, so that damage such as galling or wear may occur between the roller 28 and the dock 27. It does not occur.
[0037]
When moving the crane vehicle 6, as shown in FIG. 5, the crane vehicle 6 is caused to travel with the boom 2 storing the jib 3 completely laid down. Since the jib 3 is already stored in the swing limit on the back side of the boom 2, the tip end of the main hook 10 is inadvertently brought into contact with the ground, or the main hook 10 is swung by vibration during traveling. Such a problem does not occur.
[0038]
That is, the swing member 24 of the present embodiment also functions as a hook-in bracket for storing the main hook 10, and the storage of the main hook 10 is performed simultaneously with the storage of the jib 3.
[0039]
On the other hand, when swinging out the jib 3 in the retracted state, the reverse work procedure is performed.
[0040]
When swinging out the jib 3, first, the boom 2 is raised to an angle of about 70 ° as shown in FIG. 4 and the engagement of the automatic lock pin 20 is released while maintaining the posture of the boom 2. The main winding winch 7 is driven and the rewinding of the main winding wire 9 is started.
[0041]
As a result, the force with which the base portion of the main hook 10 presses the main hook contact surface 24b of the swing member 24 is gradually loosened, and the jib 3 is rotated in the clockwise direction in FIG. As shown in FIG. 3, the rocker gradually swings and swings out from the pivot position 26 to a state where it is vertically suspended.
[0042]
At this time, as the main winding wire 9 is unwound, the swinging member 24 gradually swings in the clockwise direction while supporting the jib 3, so that the spare wire is used to prevent the jib 3 from popping out. do not have to. That is, as in the case where the jib 3 is stored, when the jib 3 is swung out, the operation actually required by the operator is only the driving operation of the main winding winch 7, and the field work by the operator is unnecessary.
[0043]
Finally, as shown in FIG. 2, a certain gap is formed between the lower surface of the main hook contact surface 24 b of the swing member 24 and the base of the main hook 10, and the base of the main hook 10 is When no longer interferes with the rocking member 24, the rewinding of the main winding winch 7 is stopped, the auxiliary winding wire 13 is attached to the tip of the jib 3, and the auxiliary winding wire is retracted while the boom 2 is tilted by the retracting operation of the boom hoisting cylinder. 13 is wound up, and the boom 2 and the jib 3 are extended into an inch worm shape, thereby completing the swing-out operation of the jib 3.
[0044]
Since the pivoting portion 25 of the swinging member 24 and the pivoting position 26 of the jib 3 are arranged offset in the longitudinal direction of the boom 3, the roller 28 of the swinging member 24 and the dock 27 of the jib 3 are actually connected. The abutment is limited to a state in which the jib 3 is very close to the boom 2, that is, the posture in the preliminary storage state or the storage state as shown in FIGS. 2 to 4.
[0045]
On the other hand, in the state where the jib 3 is greatly swung out with respect to the boom 2 and the swinging member 24 swings in a direction away from the lower surface of the jib 3, the roller 28 is moved due to the offset of the pivoting position described above. It moves beyond the position of the dock 27 to the tip of the jib 3 and the interference between the roller 28 and the dock 27 is eliminated. As described above, the dock 27 is fixed inside the base portion of the bifurcated jib 3, and the roller 28 pivotally attached to one side of the swing member 24 includes the bifurcated jib 3. Since it is arranged so as not to interfere with the inside, the swinging member 24 swings greatly in a direction away from the lower surface of the jib 3 to support the roller 28 when the interference between the roller 28 and the dock 27 is eliminated. There is no object, and the swinging member 24 is held vertically suspended from the pivoting portion 25 by its own weight.
[0046]
Accordingly, even when the jib 3 is completely swung out, the swing member 24 and the main hook 10 can be suspended vertically.
[0047]
As described above, an example has been described in which the roller 28 is provided on the side of the swing member 24 to serve as the pressure unit, while the dock 27 is provided on the jib 3 to serve as the pressure receiving unit. Both the pressure part on the side and the pressure receiving part on the jib 3 side may be constituted by rollers, or a dock is provided as the pressure part on the swing member 24 side, while a roller is provided as the pressure receiving part on the jib 3 side. You may do it. Furthermore, both the pressure member on the swing member 24 side and the pressure receiver on the jib 3 side can be configured by a dock.
[0048]
The jib 3 can be stored by providing a sensor for detecting the rising angle of the boom 2 where the pressurizing unit and the pressure receiving unit abut, and an indicator or a buzzer that operates in response to a signal from the sensor. And the swing-out operation can be performed more smoothly.
[0049]
【The invention's effect】
In the jib storage device for a crane vehicle according to the present invention, the main hook is lifted by winding the main winding wire, and the swinging member pivoted closer to the boom tip than the jib pivoting position is swung in the direction approaching the boom rear surface. The jib is folded on the back side of the boom by causing the pressure part provided on the rocking member to contact the pressure receiving part on the jib and rocking the jib together with the rocking member. All that is required is the drive operation of the winch for the main winding wire, and the jib can be stored with a very simple operation from the driver's seat, eliminating the need for field work such as wire connection work. .
[0050]
In addition, since at least one of the pressure receiving portion and the pressurizing portion required for transmitting the movement of the swinging member to the jib is constituted by a rotatable roller, the pressure receiving portion that relatively moves in the pressure contact state. Damage such as galling and wear that may occur between the pressure part and the pressure part can also be prevented.
[Brief description of the drawings]
FIG. 1 is a side view showing a main part of a jib storage device for a crane truck of an embodiment to which the present invention is applied.
FIG. 2 is a side view showing the overall structure of the crane.
FIG. 3 is a side view showing a situation when the base portion of the main hook comes into contact with the main hook contact surface in the jib pre-stored state.
FIG. 4 is a side view showing a state where the storage of the jib is completed.
FIG. 5 is a side view showing the external appearance of a crane vehicle equipped with a crane equipped with a jib storage device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crane 2 Boom 3 Jib 4 Top sheave for main winding wire 5 Guide sheave for main winding wire 6 Crane 7 Main winding winch 8 Guide roller 9 Main winding wire 10 Main hook 11 Top sheave 12 for auxiliary winding wire Supplementary winding wire Guide Sheave 13 Supplementary Wire 14 Sheave 15 Sub Hook 16 Hydraulic Cylinder 17 Piston Rod 18 Rod Fixing Bracket 19 Locking Piece 20 Automatic Lock Pin 21 Swing Body 22 Staple 23 Jib Storage Device 24 of Crane Car Swing Member 24a Swing Member Body 24b Main hook contact surface 25 Pivoting part 26 Pivoting position of main wire top sheave (jib pivoting position)
27 Dock (pressure receiving part)
28 Roller (Pressure part)
A Normal passing through the center of the main hook contact surface B Direction from the normal to the boom tip

Claims (2)

In a jib storage device for a crane vehicle, comprising a jib pivotally attached to a boom tip, and a main hook suspended from a main winding wire hung on a main winding wire top sheave at the boom tip.
A swing member provided with a main hook contact surface is provided at the tip of the swing member main body, and the main hook contact surface is offset in a direction from the normal passing through the center of the main hook contact surface toward the boom tip. Forming a pivot part for attaching the swinging member to the boom at a position on the swinging member main body separated from the boom,
The pivot member is pivotally pivoted via the pivot portion at a position on the boom closer to the tip of the boom than the pivot position of the main winding top sheave.
A jib storage device for a crane truck, wherein the swing member is provided with a pressurizing portion for pressing a pressure receiving portion formed on the jib. At least one of the pressure receiving part and the pressure applying part is constituted by a rotatable roller, and the pressure receiving part and the pressure applying part are swung in a state where the jib is swung to a preliminary storage position approaching the lower surface of the boom. The jib storage device for a crane truck according to claim 1, wherein the device is disposed at a position where the members abut against each other when the members are swung toward the lower surface of the boom.

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