JPS6212156B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention consists of a horizontal shaft protruding from the bottom of the tip of a telescopic boom on both sides, and notches in the longitudinal direction of the jib provided on both sides of the base end of the jib so that the horizontal shaft can be engaged and disengaged. and a means capable of closing the opening of the notch, and the jib is folded at a lower position along the lower surface of the boom tube at the base of the retracted telescoping boom, and the jib is folded at the horizontal axis as a bending point, and as the jib reaches its tip, the side of the telescoping boom is The present invention relates to a jib storage device for a telescoping boom, in which the lengths of the jib in the longitudinal direction of the notches on both sides are made different so that the jib protrudes in the opposite direction.

This type of jib storage device allows the length of the jib to be increased because the tip of the jib in the lower holding position does not interfere with the derrick cylinder installed below the telescopic boom, and the weight of the jib in the lower holding position prevents the jib from interfering with the base. It is used in general crane vehicles because the torsional moment acting on the boom tube is relatively small, but when applied to self-propelled cranes (wheel cranes) where the crane operator's cab also serves as a traveling operator's cab. In this case, the jib in the lower position obstructs the side view of the driver while driving.

To avoid this, if the jib is stored in a horizontal position along the side wall of the base boom tube, a large torsional moment due to the weight of the jib will act on the base boom tube, so it is necessary to increase the torsional rigidity of the base boom tube. This results in an increase in the weight of the base boom tube, ie, a decrease in crane lifting capacity.

The present invention addresses this problem by ensuring that the jib always passes through the lower position when storing or extending the jib sideways, and restraining the jib in the lower position during cargo handling operations. At the same time, the jib is configured to be restrained in a side-hugging position.

In the present invention, the tip of an arm-shaped bracket 17 protruding and fixed to the tip of the jib 10 in the lower holding position is attached to the lower part of the side wall of the base boom tube 1 on the protruding side of the jib by a pin 16 that can be freely inserted and removed. Approximately between the lower holding position and the horizontal holding position along the side wall of the base boom tube.
A cross beam 31 that is pivotally attached to be able to rotate by 90 degrees and that can detachably fix the base of the jib to the lower side in the lower holding position, the side wall of the cross beam that protrudes from the jib, and the side wall of the base boom tube on that side. and a bottom link 33 that connects the other end of the cross beam and the bottom of the base boom tube. A straight line parallel to the base boom cylinder axis through approximately the rotation center line 0
-0, a jib guide mechanism configured to rotate between a lower position and a side position is attached to the tip of the base boom cylinder, and when the jib is lowered, the bottom link connecting side end of the cross beam is connected to the base. A device is provided on a self-propelled crane, which is provided with means 45 for detachably fastening to the boom cylinder, and is detachably connected to the tip of the jib, and is capable of lifting and rotating the jib from a lower holding position to a side holding position. A feature of the present invention is that means for mounting the jib and restraining the jib in a horizontally held position is provided on the base boom cylinder side.

An embodiment of the present invention will be described below with reference to the drawings.
The telescopic boom has a tip boom tube 2 inside a base boom tube 1.
It is slidably inserted into the boom and can be extended and retracted using a built-in boom telescoping cylinder (not shown).
The base end of the base boom tube 1 is connected to the vehicle body 3 of the self-propelled crane.
It is pivoted by a foot pin 5 to a swivel base 4 which is rotatably attached to the base boom cylinder, and can be raised and raised by a derrick cylinder 6 installed between the lower surface of the base boom cylinder and the swivel base. Reference numerals 7 and 8 indicate pulleys for cargo handling work that are attached to the upper and lower ends of the tip boom tube 2, and both ends of the support shaft 9 of the lower pulley 8 protrude to both sides of the tip boom tube, so that the jib 1
It becomes a horizontal axis that pivots the base end of 0. Reference numeral 11 indicates a crane operator's cab which is installed on the swivel base 4 and is also used as a traveling operator's cab.

The jib 10 has a tapered planar shape in which the U-shaped stringers 10a and 10b on both sides are connected and fixed together by a plurality of horizontal bars 10c, etc., and both ends of the shaft 9 are connected to the proximal ends of the U-shaped stringers 10a and 10b. The jib is removably pivoted to the support shaft 9 by fitting into notches 10d and 10e provided in the respective notches and closing the open ends of the notches with removable pins 12 and 13, respectively. The inner ends of the notches 10d and 10e or the ends on the tip side of the jib are located on the same plane orthogonal to the jib axis. Therefore, after the jib 10 is rotated about the shaft 9 to the position shown by the chain line in FIG. 1, the tip of the jib and the upper tip of the tip boom barrel 2 are connected by tension rods 14 or tie ropes on both sides. Therefore, when the jib is supported in the extended position, the jib and the telescopic boom are located on the same vertical plane.

Also, the length from the back end of notch 10e to pin 13
Lb is slightly larger than the length La from the back end of the notch 10d to the pin 12. Therefore, as shown in FIG. 10, the jib 10 suspended and supported from the shaft 9 at the tip of the telescopic boom in the upright state is pulled toward the base boom tube 1 side using the jib rotation operation means described later. When the jib 10 is folded to the lower position shown by the solid line in FIG. 1, the jib 10 protrudes to the side of the telescoping boom as it reaches its tip as shown in FIG. 2.

As shown in FIGS. 8 and 9, an arm-shaped bracket 17 is fixed above the tip side of the center of gravity G of the jib 10 in the lower holding position, and the tip of the arm-shaped bracket is attached to the base boom cylinder 1. It is pivotally connected between the front and rear flanges 15a of the U-shaped member 15 welded to the side surface by a pin 16 that can be freely inserted and removed. Inside the U-shaped member 15, there are regulation plates 15b and 15c that also serve as guiding plates for guiding the arm-shaped bracket 17 into the U-shaped member and regulating the tip of the jib to the lower holding position, and front and rear flanges 15a and arm-shaped regulating plates 15b and 15c. A stopper 15d is welded and fixed to the bracket 17 so that the pin 16 insertion hole formed in each of the brackets 17 substantially coincides with the stopper 15d.

The rotation operation means of the jib 10 with the pin 16 as the rotation center is such that the upper end of the support frame 20 of the pulley 19 is attached to the tip of the arm 18 projecting laterally from the upper end of the U-shaped member 15 to the shaft 21 parallel to the pin 16. winch 22 (first
The winding cable 23 shown in the figure is hung on the pulley 19, and the tip of the winding cable is detachably fixed 25 to a bracket 24 which projects from the side surface of the jib 10 opposite to the base boom cylinder. Reference numeral 26 denotes a restraining piece fixed on the jib 10 on the side opposite to the bracket 17. When the jib is rotated about the pin 16 to the sideways position shown by the chain line in FIG. It is removably pinned 27 to the welded bracket 15e,
The jib 10 is restrained in the horizontal position.

Reference numeral 28 denotes a rope anchorage protruding from the tip of the jib between the bracket 17 and the restraining piece 26, and the 10th
As shown in the figure, when the jib 10 is pulled to the lower holding position around the shaft 9, the tip of the winding cable 23 is detachably fixed to the cable stopper 28. Reference numeral 29 indicates a connecting fitting for the tension rod 14, which is fixedly protruding from both sides of the tip of the jib, and 30 indicates a connecting fitting for the derrick cylinder 6, which is welded to the lower surface of the base boom cylinder 1.

As shown in FIGS. 3 to 7, in the jib guide mechanism, one ends of links 32 and 33 of equal length are pivotally attached to both ends of a cross beam 31 with a U-shaped cross section by pins 34 and 35, and the other ends of the links 32 and A pin 3 is attached to a bracket 37 of a vertical member 36 whose end is fixed to the side wall of the base boom cylinder 1.
8, and the other end of the other link 33 is pivotally connected to a bracket 39 fixed to the bottom surface of the base boom cylinder 1 by a pin 40, and is fixed to the lower surface of both sides of the cross beam 31 in the jib lower holding position. The bracket 41 has brackets 42 fixedly protruding from both sides of the jib 10.
are fixed by pins 43 which can be inserted and removed.

In the jib lower position, the link 32 is attached to the cross beam 3.
1, the pins 34, 40, and 35 are arranged in a straight line, and the length of the crossbeam between the pins 34 and 35 is twice the length of the link 32 or 33. Therefore, when the weight of the jib 10 is acting on the cross beam 31, the pin 16 is attached to the tip of the jib.
If a clockwise rotation moment is applied around the jib, the torsional force generated in the jib will cause the link
2 and 33 are rotated clockwise around pins 38 and 40, respectively, and the cross beam 31 is tilted and lifted from the lower position shown by the solid line in FIG. 3 to the horizontal position shown by the chain line in FIG. At that time, the jib axis J on the jib base side is a semicircular trajectory M centered on the virtual point 0.
The radius R of the semicircular trajectory is approximately equal to the radius R of the arcuate trajectory N drawn by the jib axis J on the jib tip side with the pin 16 as the center.

That is, the tip of the jib is moved from the lower position shown by the solid line in FIG. 8 to the horizontal position shown by the chain line in FIG.
degree, the jib axis J rotates in an arc of radius R with the straight line connecting the center of the pin 16 and the virtual point 0 as the rotation center line 0-0, and at the same time, the link 32, 33 follows and rotates around the pins 38 and 40 while increasing and decreasing the rotational angular velocity, and rotates 90 degrees while lifting the base side of the cross beam 31 or the jib 10.

Reference numeral 44 denotes a restraining piece protruding and fixed to the right end of the bottom surface of the base boom cylinder 1 facing the cross beam 31. By inserting a removable pin 45 into a pin hole bored correspondingly to the restraining piece 44 and the cross beam 31, When the jib side holding device is not in use, the cross beam 31 can be restrained in the jib holding position.
Reference numeral 46 indicates a guiding piece of the cross beam 31 fixed to the bottom surface of the base boom cylinder 1 as shown in FIG. 4, and 47 indicates a pulley for passing the auxiliary winding cable at the tip of the jib.

When storing the jib, first, the cross beam 31 is restrained to the base boom tube 1 by the pin 45 in the jib lowering position shown by the solid line in Figure 3, and then the tip of the telescopic boom in the upright position is secured as shown in Figure 10. horizontal axis 9
The winding rope 23 is fixed to the end rope anchorage 28 of the jib 10 suspended and supported by the jib 10, the winding rope is wound up by the winch 22, the jib is pulled to the lower position, and the telescopic booms 1, 2 Lay it down in a nearly horizontal position. Next, the arm-shaped bracket 17 at the tip end of the jib is pivotally connected to the square member 15 of the base boom cylinder 1 by the pin 16 as shown in FIG. 8, and the brackets 42 on both sides of the jib base are respectively connected as shown in FIG. After fixing it to the brackets 41 on both sides of the cross beam 31 with pins 43, attach the pins 1 on both sides of the base end of the jib.
2 and 13 to open the notches 10d and 10e, and extend the tip boom tube 2 as shown by the chain line in FIG. 2 so that the tip of the tip boom tube does not interfere with the horizontal holding of the jib.

Next, replace the end of the winding cable 23 with the bracket 24 from the rope stopper 28, remove the pin 45 from the cross beam 31, and wind the winding rope 23 with the winch 22, so that the end of the jib is centered around the pin 16. The jib is rotated to the horizontal holding position shown by the chain line in FIG. The jib 10 is stored in the sideways position shown by the chain line S in FIG.

In addition, in order to smooth the horizontal movement of the jib, the jib 10
The fixed position of the winding rope 23 in the jib axial direction is
As shown in FIG. 9, it is preferable that the arm-shaped bracket 17 be slightly biased toward the base of the jib.

Also, the center of gravity G of the jib at the lower holding position is located on the vertical plane including the rotation center line 0-0 as shown in Fig. 2, or
Alternatively, by positioning the pin 38 between the vertical plane and a vertical plane including the rotation center line of the pin 38, the horizontal beam 31 can be moved when the jib 10 is moved laterally by the winch 22.
When the pin 45 is removed, the jib can not only be stably supported in a substantially lower holding position, but also the jib in the horizontal holding position can be constantly urged to return to the lower holding position by the action of gravity.

In addition, when returning the jib from the side-hugging position to the down-hugging position, lower the telescopic boom approximately horizontally, extend it slightly as shown by the chain line in Figure 2, and restrain the tip of the jib in the side-hugging position. If the pinning 27 is released and the winding cable 23 is gradually let out from the winch 22, the jib 10
Due to its own weight, it rotates and returns to the lower holding position approximately around the rotation center line 0-0. Therefore, if the end of the connecting side of the bottom link 33 of the cross beam 31 is fixed to the restraint piece 44 on the base boom cylinder side with the pin 45, both sides of the cross beam that fixedly support the jib base will be attached to the side link 32 and the pin 45.
Since it is fixed to the base boom tube 1 by
The base of the jib is restrained in the lower position, and the tip of the jib is secured by the pivoting of the tip of the arm bracket 17 to the side wall of the base boom cylinder, and the torsional rigidity of the jib itself, which restrains the base in the lower position. The patient is held in a cradling position.

Therefore, look up and down the telescopic boom with the jib down,
It can be extended and retracted for cargo handling work, or the jib can be extended. When the jib in the lower holding position is extended from the tip of the telescopic boom, retract the telescopic boom and engage the horizontal shafts 9 on both sides of the tip with the notches 10d and 10e on both sides of the base end of the jib, respectively. The opening is closed with the pins 12 and 13, and then the jib tip is slightly pulled toward the bottom of the base boom cylinder by the winch 22, the jib base is released from the cross beam 31, and the jib tip is pivoted. pin 16
Remove the jib, raise the telescopic boom, and extend the jib in the same way as before.

According to the present invention, when extending the jib at the side-carrying position from the tip of the telescopic boom, or when storing the jib at the extended position into the side-carrying position, the jib must not only pass through the side-carrying position; Since the jib is configured so that it can be restrained in either the lower position or the horizontal position, the jib can be restrained in the horizontal position while traveling on the road, widening the lateral visibility for the self-propelled crane operator, and improving cargo handling. By restraining the jib in the lower position during work, the torsional moment applied to the base boom tube due to the jib's own weight is reduced, reducing the weight of the base boom tube and increasing the crane lifting capacity compared to conventional cranes. It can be made to the same level as the jib lower holding type telescopic boom, and it has the effect that it is extremely easy to convert between the lower holding and side holding of the jib.

[Brief explanation of the drawing]

1 and 2 are a side view and a plan view schematically showing an embodiment of the present invention, respectively, and FIGS. 3 and 4 are A-A in FIG. 1 with the tip boom barrel omitted, respectively.
Cross-sectional view and its side view, Figures 5, 6, and 7
The figures are CC sectional view, D-D sectional view and E-E sectional view of Fig. 3, respectively, and Figs. 8 and 9 are B-B sectional view of Fig. 1 with the tip boom tube omitted, respectively. The figure and its side view, FIG. 10, are side views showing the method of lowering the jib. 1...Base boom tube, 2...Tip boom tube, 3
...Car body, 4...Swivel base, 5...Foot pin, 6
... Derrick cylinder, 9 ... Horizontal axis, 10 ...
Jib, 11... Crane operator's cab that also serves as a traveling operator's cab, 12, 13... Pin, 16... Pin, 17...
... Arm-shaped bracket, 19 ... Pulley, 22 ... Winch, 23 ... Winding cable, 31 ... Cross beam, 32,3
3...Link.

Claims (1)

[Claims] 1. A horizontal shaft protruding from the bottom of the tip of the telescopic boom on both sides, a notch in the longitudinal direction of the jib provided on both sides of the base end of the jib so that the horizontal shaft can be engaged and disengaged, and the notch in the longitudinal direction of the jib. and a means capable of closing the opening,
The longitudinal direction of the jib of the notches on both sides is such that the jib, which is folded with the horizontal axis as the bending point, protrudes to the side of the telescoping boom as it reaches its tip at a lower holding position along the lower surface of the boom tube at the base of the retracted telescoping boom. In a self-propelled crane with different lengths, the tip of an arm-shaped bracket 17 protruding and fixed to the tip of the jib 10 in the lower holding position can be freely inserted and removed from the lower part of the side wall of the base boom cylinder 1 on the side where the jib protrudes. The tip of the jib is pivoted by a pin 16 so that it can rotate approximately 90 degrees between a lower holding position and a side holding position along the side wall of the base boom tube, and the base of the jib in the lower holding position is pivoted downward. A cross beam 31 that can be detachably fixed to a side, a side link 32 that connects the jib protruding side end of the cross beam and the base boom tube side wall on that side, and the other end of the cross beam. The jib base fixed to the cross beam passes through the center of the pin 16 and connects the bottom link 33 with the bottom surface of the base boom cylinder, and the bottom link 33 connects with the bottom surface of the base boom cylinder. A jib guide mechanism configured to rotate between a holding position and a side holding position is attached to the tip of the base boom cylinder, and the bottom link connecting end of the cross beam is attached to and detached from the base boom cylinder when the jib is held in the lower position. A device is mounted on a self-propelled crane, which is provided with a means for freely fixing the jib and is detachably connected to the tip of the jib so as to be able to lift and rotate the jib from a lower holding position to a side holding position. A jib storage device for a telescoping boom, characterized in that a means for restraining the jib in a sideways position is provided on the base boom cylinder side. 2. On a vertical plane containing the rotation center line 0-0 of the jib, or between the vertical plane and a vertical plane containing the rotation center line of the side link 32 connected to the side wall of the base boom barrel,
The jib storage device for a telescopic boom according to claim 1, wherein the center of gravity of the jib is located in the lower holding position. 3 The device that lifts and rotates the jib lifts the tip of the winch winding cable via a pulley attached to the base of the base boom tube above the tip of the jib in the lower holding position.
A jib storage device for a telescopic boom according to claim 1 or 2, wherein the jib storage device is configured to be detachably attached to the end of the jib tip opposite to the base boom tube.