JP4964520B2 - Telescopic cylinder storage device for jib undulation operation of crane truck - Google Patents

Description

  The present invention relates to a retractor for a telescopic cylinder for raising and lowering a jib attached to a boom of a crane vehicle.

  The crane truck is provided with a jib to compensate for the length of the boom. As shown in FIG. 6, the jib 1 is used by supporting the base portion on the boom head 3 of the boom 2 and protruding in front of the boom 2. The angle (extension angle) of the jib 1 in the longitudinal axis direction with respect to the longitudinal axis direction of the boom 2 is the length of the tension rod 5 installed between the boom head 3 and the head of the jib 1 and the length of the telescopic cylinder 6 for jib hoisting operation. The extension angle is changed by extending and contracting the piston rod 7 of the expansion cylinder 6 for raising and lowering the jib. And it can respond to various work by changing the overhang angle of jib 1 suitably. If the projection angle of the jib 1 with respect to the boom 2 is increased, the pocket area becomes wider, and work close to the building or work in the back of the building can be easily performed. When the jib 1 is not used, the tension rod 5 and the extension cylinder 6 for raising / lowering the jib are stored along the jib 1.

  Next, a specific structure of the conventional cylinder storage device shown in FIG. 6 will be described. The tip of the tension rod 5 is connected to the tip of the piston rod 7 of the expansion / contraction cylinder 6 for jib raising / lowering operation by a pin 8 so as to be rotatable in a vertical plane. The base end of the telescopic cylinder 6 is connected to a first bracket 11 provided on the jib 1 via a pin 12.

  The tension rod 5 when using the jib 1 is attached to the upper part of the boom head 3 with a pin 13 as shown by a two-dot chain line in FIG. Further, at the time of storage, the base end of the tension rod 5 is attached to the second bracket 14 provided on the jib 1 through the pin 15 as shown by the solid line in FIG. A link 17 extending downward is fixedly attached to a connecting end of the tension rod 5 with respect to the piston rod 7 of the telescopic cylinder 6. At the lower end of the link 17, a notch 18 that opens toward the tip side is provided. On the other hand, a storage bracket 19 is provided on the jib 1 side so as to protrude toward the tension rod 5 side. A pin 20 is provided at the protruding end of the storage bracket 19.

As shown in FIG. 6, when the piston rod 7 of the telescopic cylinder 6 is contracted the shortest, the telescopic cylinder 6 is aligned with the tension rod 5 and the pin 20 of the storage bracket 19 is in the notch 18 of the link 17. Get in. In this state, the base end of the tension rod 5 is removed from the boom head 3, the tension rod 5 is tilted around the pin 8 so as to approach the jib 1, and the base end of the tension rod 5 is moved to the second bracket 14 of the jib 1. Multiply by. As a result, the link 17 rotates together with the tension rod 5, the link 17 and the storage bracket 19 are connected, and the tension rod 5 and the telescopic cylinder 6 can be stored in the jib 1.
Japanese Patent Laid-Open No. 2-86596

  The telescopic cylinder 6 in the structure of the conventional cylinder storage device is stored in the storage bracket 19 of the jib 1 at the most contracted position. The telescopic cylinder 6 cannot be brought closer to the jib 1 side than the most contracted position, so that it is stored in a posture protruding from the upper surface of the jib 1.

  The protruding amount of the telescopic cylinder 6 at the retracted position increases in accordance with the projecting height of the retracting bracket 19 that attaches the telescopic cylinder 6 to the jib 1. That is, it depends on the height of the storage bracket 19. Therefore, if the height of the storage bracket 19 is lowered, it can be stored more compactly.

  However, to reduce the height of the storage bracket 19, the overhang height of the first bracket 11 must be reduced. If the protruding height of the first bracket 11 is lowered, the jib driving moment by the telescopic cylinder 6 for raising and lowering the jib is reduced, the jib driving force is reduced, and the posture of the jib 1 becomes unstable. The height of 11 cannot be set lower than that. For this reason, conventionally, it has not been possible to set the protruding amount of the stored telescopic cylinder 6 as small as desired.

  If the amount of protrusion of the telescopic cylinder 6 when stored is large as in the prior art, the following problems are caused. When the upper and lower surfaces of the jib are placed on the left and right sides of the boom when retracted and retracted to the side of the boom, the part of the telescopic cylinder 6 may protrude laterally beyond the vehicle width to the side of the boom. It becomes difficult for the vehicle to enter. Further, in the system in which the jib is stored below the boom, the boom is raised by the amount of protrusion, and the visual field is obstructed from the cab. In addition, the center of gravity of the traveling body is shifted laterally or increased.

  The present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is to make a crane vehicle capable of compactly storing a telescopic cylinder for jib hoisting operation close to the main body side of the jib and fixed at that position. An object of the present invention is to provide a retractable device for a telescopic cylinder for jib undulation operation.

  The present invention is a jib attached to a boom of a crane vehicle, and one end is connected to the tip of the boom when the jib is used, and the end is removed from the tip of the boom when the jib is stored. A tension rod connected to a first bracket provided on the jib with the one end close to the jib, and one end connected to the other end of the tension rod via a rotation shaft, and a first provided on the jib. A telescopic cylinder for jib hoisting operation having the other end pivotally connected to the two brackets, an abutting member provided at one end of the telescopic cylinder for jib hoisting operation, and an abutting member provided in the middle of the jib A first receiving part that regulates the movement end position of the expansion cylinder for the jib raising and lowering operation in the upward direction away from the jib, and a similar movement toward the jib by contacting the contact member. A second receiving portion for restricting a terminal end, and the contact member is positioned between the first receiving portion and the second receiving portion when the telescopic cylinder for jib raising / lowering operation is retracted to a position where it can be stored. And the cylinder receiving bracket configured to be disposed away from the position of the contact member when the second receiving portion is retracted to a position where the telescopic cylinder for jib raising / lowering operation can be retracted. An arm member provided at the other end of the tension rod and having a first engaging portion at a tip end portion that rotates together with the tension rod about the rotation axis; and provided on the jib side, A second engaging portion for engaging the first engaging portion, and the connecting portion of the tension rod and the expansion / contraction cylinder for jib raising / lowering operation is directed toward the jib with the rotating shaft as a center. Crooked Then, the abutting member moves until it hits the second receiving portion, and the arm member rotates together with the tension rod about the rotating shaft, whereby the first engaging portion is moved to the second receiving portion. A storage device for a jib hoisting cylinder of a crane truck, wherein the telescopic cylinder for jib hoisting operation is stored in the storage bracket by engaging with an engaging portion.

  According to the present invention, when the telescopic cylinder for jib hoisting operation is stored in the jib, the offset angle when the telescopic cylinder for jib hoisting operation is reduced to the minimum is close to the smallest state, and the jib hoisting cylinder and the tension rod are substantially aligned. By moving the connecting portion toward the jib from the state to be bent, the telescopic cylinder for jib raising / lowering operation can be stored close to the main body side of the jib. Therefore, peripheral members such as the extension cylinder for jib raising / lowering operation and the surrounding wire rope and guide roller do not protrude from the width of the traveling body, or the center of gravity of the traveling body is not shifted or increased. In addition, the extension cylinder for the jib hoisting operation is fixed to the jib in conjunction with the retracting operation of the tension rod, the storing operation is simple and easy, and the retracting operation of the extension cylinder to the jib is performed reliably. .

  Hereinafter, the crane truck concerning one embodiment of the present invention is explained based on Drawings 1-5. FIG. 1 is a plan view showing the entire crane vehicle. In FIG. 1, reference numeral 21 denotes a vehicle body, and the vehicle body 21 is provided with a swivel base 22. The swivel base 22 is provided with a retractable multistage boom 24 that is lifted and lowered by a hoisting cylinder 23. A boom head 26 that also serves as a sheave block is attached to the tip of the top boom 25 of the multistage boom 24 (see FIG. 2).

As shown in FIG. 2, a guide sheave 27 is attached to the upper position of the boom head 26. A guide sheave 28 is also attached to a lower position of the boom head 26. The guide sheave 27 guides a supplementary wire rope 30 fed from a winch device 29 provided on the swivel base 22 and guides it to a guide sheave 33 of a jib head 32 provided at the tip of the jib 31. A lifting hook (not shown) is attached to the tip of the auxiliary wire rope 30. When the jib 31 is stored, the jib head 32 is provided with a hooking portion (not shown) for hanging the tip of the auxiliary winding wire rope 30.
In FIG. 2, reference numeral 38 denotes a cab that serves as a traveling cab and a crane operation room, and reference numeral 39 denotes an outrigger.

  Further, in FIG. 2, reference numeral 31 is a jib for supplementing the length of the boom 24. The jib 31 is stored along the side surface of the boom 24 with the base end 42 formed in the fork shape directed toward the tip side of the boom. When the jib 31 is used, the boom 24 is opened from the side surface of the boom 24. Then, as shown in FIG. 2, the fork-like base end 42 is supported by a horizontally oriented support shaft 43 provided at the lower part of the boom head 26, and the base end 42 is the center. By rotating, the jib 31 is projected in front of the boom 24.

  The tension rods to be described next are two left and right symmetrically arranged around the longitudinal axis of the jib. For convenience of explanation, only the left tension rod will be described. As shown in FIG. 2, a tension rod storage bracket 55 as a first bracket described later is provided on the upper end of the base end of the jib 31. A second bracket 45 is provided on the upper end portion of the jib 31 as a cylinder storage bracket protruding upward. A horizontally oriented pin (shaft) 46 is provided at the upper end of the second bracket 45. The pin 46 supports the proximal end of the cylinder tube 48 of the telescopic cylinder 47 for hoisting operation, and the cylinder tube 48 is rotated around the horizontal axis. It is designed to be pivotally supported. A roller 49 for receiving a rope or the like is provided on the upper portion of the second bracket 45.

  A tip end of a tension rod 51 is connected to a tip end of a piston rod 50 of the hoisting expansion / contraction cylinder 47 by a pin-shaped bending pivot (rotating shaft) 52 so as to be rotatable in a vertical plane. Therefore, the piston rod 50 and the tension rod 51 can be bent in a vertical plane around the pin-shaped bending pivot 52.

  At the base end of the tension rod 51, a connecting hole 53 is formed which is a long hole along the longitudinal axis direction of the tension rod 51. At the time of use shown in FIG. 2, the pin 54 provided on the upper portion of the boom head 26 is inserted into the connection hole 53, and the tension rod 51 is connected to the boom head 26. Further, the tension rod storage bracket 55 as the first bracket described above is provided on the upper part of the base end of the jib 31, and the connecting hole 53 of the tension rod 51 and the hole of the rod storage bracket 55 are aligned when stored. Then, the base end of the tension rod 51 is connected to the jib 31 by inserting the pin 56 over both.

  The tip of the tension rod 51 is connected to the link 57 through the pivot 52 described above. The link 57 is connected to the tip of the piston rod 50 of the telescopic cylinder 47 via a vertical shaft 58 so as to be bent in the horizontal direction (see FIG. 5). In the system in which the jib 31 is stored under the boom 24, the link 57 may be fixedly attached to the tip of the piston rod 50. A roller 59 for receiving a rope or the like is provided on the upper portion of the link 57.

  Further, as shown in FIG. 2, the proximal end portion of the arm member 61 is fixedly attached to the distal end portion of the tension rod 51. The arm member 61 rotates around the pivot 52 integrally with the tension rod 51. A first engagement portion 62 formed of a notch that opens toward the front in the rotation direction is formed at the rotation tip side portion of the arm member 61.

  Further, as shown in FIG. 2, a pair of left and right brackets 63 projecting upward as a cylinder storage bracket are provided on the upper side surface of the jib 31 corresponding to the vicinity of the tip of the cylinder tube 48 of the telescopic cylinder 47. ing.

  As shown in FIG. 5, a second engaging portion 64 made of a pin that can be engaged with the first engaging portion 62 protrudes toward the horizontal side at the upper end of the protruding portion of the cylinder housing bracket 63. Is provided.

  As shown in FIG. 5, the protruding upper end portion of the cylinder housing bracket 63 is located above the position of the second engaging portion 64 and has a U-shaped cut opening toward the proximal end side of the jib 31. A notch opening 65 is formed. Pins 66 protruding outward from the respective side surfaces are fixedly provided on the side surfaces of the link 57. The pin 66 becomes a contact member that inevitably enters the opening 65 at that position when the telescopic cylinder 47 is contracted to be retracted. The upper and lower edges of the notch opening 65 constitute restricting means for restricting the end of movement of the pin 66 in the vertical direction. That is, the top (upper) edge of the opening 65 is the first receiving portion 67 that restricts the upward movement of the pin 66. The lower edge portion of the opening 65 is a second receiving portion 68 that restricts the downward movement of the pin 66. When the jib 31 is used, the first receiving portion 67 restricts the upward movement of the pin 66 when the telescopic cylinder 47 contracts and the offset angle of the jib 31 decreases, and the telescopic cylinder 47 and the tension rod 51 prevents the reverse movement to the reverse side which should not go originally, and prevents the turning phenomenon of the telescopic cylinder 47 and the tension rod 51. The above structure is the same as that on the left side of the right tension rod.

  Next, the operation of the crane truck will be described. During the crane work, the auxiliary wire rope 30 fed from the winch device 29 is guided by the sub guide sheave 27 and the cargo handling work is performed by the hook of the wire rope 30. Then, the boom 24 is raised and lowered by the hoisting cylinder 23, and the offset angle of the jib 31 with respect to the boom 24 (the angle θ formed between the longitudinal axis of the jib and the longitudinal axis of the boom) is changed by the telescopic cylinder 47 for raising and lowering the jib. The working posture of the jib 31 is changed.

  As shown in FIG. 2, when the telescopic cylinder 47 is reduced to near the minimum position, the offset angle of the jib 31 with respect to the boom 24 is minimized. At this time, the pin 66 of the link 57 enters the opening 65 of the cylinder storage bracket 63. The first receiving portion 67 formed of the top portion of the opening 65 prevents the pin 66 from moving upward further, and the jib hoisting expansion / contraction cylinder 47 and the tension rod 51 are bent back (the offset angle is negative). ). Therefore, the jib 31 can be raised to a high position where the offset angle is small.

  Next, the operation when storing the jib will be described. First, the jib hoisting operation telescopic cylinder 47 is in the most contracted state as shown in FIG. As a result, the offset angle θ is minimized. In this state, the tip of the sub-wire rope 30 is connected to the tip of the jib 31 or pulled into the pulling end and fixed.

  Then, the subwire rope 30 is wound up from the winch device 29 or the boom 24 is extended to draw the jib 31 toward the proximal end side, and this pulled state is maintained. At this time, the telescopic cylinder 47 and the tension rod 51 are substantially in a straight line when viewed from the side as shown in FIG.

  From this state, the sub wire rope 30 is further wound or the boom 24 is extended, so that the connecting portion between the telescopic cylinder 47 and the tension rod 51 is centered on the connecting pin 52 as shown in FIG. It protrudes so as to be folded downward toward the side, and is bent in a reverse “to” shape. Thus, by folding and moving toward the jib 31, the pin 66 that has entered the opening 65 of the cylinder storage bracket 63 moves downward and approaches the main body side of the jib 31. Then, the pin 66 finally comes into contact with the second receiving portion 68 of the opening 65 and is positioned there. Accordingly, the connecting portion between the telescopic cylinder 47 and the tension rod 51 is lowered toward the jib 31 by a height of a distance “h” corresponding to the vertical dimension of the opening 65, and approaches the main body of the jib 31. At the same time, the arm member 61 is lowered together with the tip of the tension rod 51 by the height of the distance “h”.

  3, the base end of the tension rod 51 is removed from the boom head 26 by pulling out the pin 54, and the base end of the tension rod 51 is lowered to the jib 31 side as shown in FIG. The rod 51 is tilted down and connected to a bracket 55 provided at the base end of the jib 31 using a pin 56.

  Thus, when the tension rod 51 is tilted to the jib 31 side and bent down, the arm member 61 also rotates together, and the first engagement portion 62 on the arm member 61 side is against the second engagement portion 62 of the second bracket 63. Necessarily mesh and engage (see FIG. 5). As a result, the connecting portion between the telescopic cylinder 47 and the tension rod 51 is fixedly supported by the cylinder storage bracket 63. Thus, the telescopic cylinder 47 and the tension rod 51 are fixedly stored along the upper surface of the jib 31. The above operation is similarly performed on the right tension rod.

  Thereafter, the jib 31 is rotated 90 degrees by a holder driving cylinder using a jib holder or the like and stored next to the boom 24 in the same manner as conventionally known storage methods.

  In the above-described embodiment, the U-shaped notch opening is formed in the cylinder storage bracket. However, if a means for regulating the position of the expansion / contraction cylinder when the expansion / contraction cylinder is reduced can be configured, It does not have to be a notch-shaped opening.

  Also, the tip of the tension rod was connected to the tip of the piston rod of the telescopic cylinder, but the tip of the piston rod of the telescopic cylinder was connected to the first bracket, and the base end of the cylinder tube of the telescopic cylinder was connected to the tension rod. It may be configured to be flexibly connected to the tip of the.

  The second receiving portion with which the pin finally comes into contact is not limited to being formed by an opening formed in the cylinder housing bracket, and a cylinder tube of an expansion / contraction cylinder may be used. In this case, a part of the cylinder tube itself constitutes a part of the cylinder storage bracket.

Further, the present invention can be applied not only when the jib is stored beside the boom but also when the jib is stored under the boom. Since the height of the boom when the jib is stored can be lowered, the position of the center of gravity in the traveling posture of the crane vehicle is low, the traveling stability is increased, and a wide field of view can be taken.
The present invention is not limited to the embodiment described above, and can be applied to other forms.

It is a top view of the crane truck concerning one embodiment of the present invention. Similarly, the side view showing the relationship when the jib is offset to the minimum in one embodiment of the present invention. The side view which similarly shows the relationship of the cylinder storage apparatus which entered the jib storage posture in one Embodiment of this invention. The side view which similarly shows the relationship of the cylinder storage apparatus at the time of jib storage in one Embodiment of this invention. Similarly, the perspective view which expands and shows the principal part of the cylinder storage apparatus in one Embodiment of this invention. Explanatory drawing of the conventional cylinder storage apparatus.

Explanation of symbols

θ ... offset angle, 1 ... jib, 2 ... boom, 5 ... tension rod 6 ... extension cylinder for jib lifting operation, 7 ... piston rod 11 ... first bracket, 14 ... second bracket, 17 ... link 18 ... notch , 19 ... storage bracket, 20 ... pin, 21 ... car body 22 ... swivel base, 24 ... multistage boom, 24 ... boom, 25 ... top boom 26 ... boom head, 29 ... winch device, 30 ... wire rope 30 ... sub Wire rope, 31 ... Jib, 47 ... Telescopic cylinder for jib raising / lowering operation 49 ... Roller, 50 ... Piston rod, 51 ... Tension rod 52 ... Bending pivot, 55 ... Rod storage bracket, 57 ... Link 61 ... Arm member, 62 ... Engagement part 63 ... Bracket 64 ... Engagement part 65 ... Notch opening part 66 ... Pin.

Claims (1)

A jib attached to the boom of a crane truck,
When the jib is used, one end is connected to the tip of the boom, and when the jib is stored, the one end is detached from the tip of the boom, and the one end is brought close to the jib, and the jib is provided on the jib. A tension rod connected to one bracket;
A telescopic cylinder for jib hoisting operation in which one end is coupled to the other end of the tension rod via a pivot shaft, and the other end is pivotally coupled to a second bracket provided on the jib;
A contact member provided at one end of the telescopic cylinder for jib undulation operation;
A first receiving portion that is provided in the middle of the jib and that regulates the movement end position of the telescopic cylinder for the jib hoisting operation in an upward direction by contacting the contact member and separating from the jib; And a second receiving portion for restricting the end of movement approaching the jib side, and when the telescopic cylinder for jib raising / lowering operation can be retracted, the contact member and the first receiving portion The second receiving portion is located between the second receiving portion and the jib raising / lowering operation expansion / contraction cylinder so as to be retractable from the position of the abutting member when being retracted to the jib side. A cylinder storage bracket configured to
An arm member provided at the other end portion of the tension rod and having a first engagement portion at a distal end portion that rotates together with the tension rod about the rotation axis;
A second engagement portion provided on the jib side for engaging the first engagement portion;
Comprising
When the connecting portion of the tension rod and the extension cylinder for jib raising / lowering operation is bent toward the jib around the rotation axis, the contact member moves until it contacts the second receiving portion, and the rotation The arm member is rotated together with the tension rod about the moving shaft, whereby the first engagement portion is engaged with the second engagement portion, and the retractable bracket for the jib raising / lowering operation is attached to the storage bracket. A storage device for a cylinder for a jib hoisting operation of a crane truck characterized by storing.

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