JP2006213494A - Boom type crane with jib - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boom type crane with a jib which can stably support a telescopic jib by reducing the stress at a support part supporting the telescopic jib, and expand the reaching range of an auxiliary hook by reducing an attack angle of the jib. <P>SOLUTION: The telescopic jib 31 is turnably connected in a vertical surface with a pin 35 on a base end of a frame body 34 turnably connected on the tip end of the telescopic boom by a shaft 33. The wire is wound between a guide sheave 39 of the tip end of the frame body and a guide sheave 41 fixed to respective jibs 31a, 31b, 31c composing the telescopic jib 31. The frame body 34 wherein respective jibs 31a, 31b, 31c are supported by the wire 43 is provided, and the stress of the support part supporting the telescopic jib 31 is reduced since the distance between the pin 35 and the guide sheave 39 can be lengthened. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a boom-type crane with a jib connected to a distal end portion of a telescopic boom that telescopically expands and contracts.

  As a crane of this type, as shown in FIG. 1, a telescopic boom supported by a swivel 1 mounted on a crane truck and tilted by a hydraulic cylinder 2 for tilting, and a sheave block 4 at the tip of the telescopic boom. A telescopic jib 5 connected to both sides by a pin (not shown), and a sheave 7 pulled out from a winch 6 for a main winding wire 8 provided on the swivel base 1 and attached to a telescopic boom 3 and a sheave block 4 at the tip of the telescopic boom. A main hook 9 that is connected to the end of a main winding wire 8 that is hung on a sheave attached to the telescopic boom 3 (not shown), and a winch that is also provided on a swivel (not shown) Drawn on the sheaves 7 and 11 of the telescopic boom 3 and the jeep block 4 (the sheaves attached to the telescopic boom 3 are not shown). Those with auxiliary winding wire 12 is suspended is connected to an end auxiliary hook 13 which eclipsed is known.

  In such a crane, the telescopic boom 3 is generally telescopically expanded and contracted by a hydraulic cylinder (not shown), and the telescopic jib 5 includes a base jib 5a, an intermediate jib 5b, and a tip jib as shown in FIG. The intermediate jib 5b is moved in and out of the base jib 5a by a hydraulic cylinder (not shown), and the leading jib 5c is moved in and out of the intermediate jib 5b by moving in and out of the intermediate jib 5b. It is supposed to be. That is, as shown in FIG. 2, after the wire 13 having one end connected to the tip of the base jib 5a is hung on the sheave 14 attached to the intermediate jib 5b, the other end is connected to the rear end of the tip jib 5c. When the intermediate jib 5b protrudes by a hydraulic cylinder (not shown) and the sheave 14 protrudes together with the intermediate jib 5b, the tip jib 5b also protrudes by the wire 13 hung on the sheave 14, but the protruding amount is twice the protruding amount of the sheave 14. Become. In this way, when the intermediate jib 5b protrudes by the hydraulic cylinder, the telescopic jib 5 follows the same, and the tip jib 5c protrudes with a double protrusion amount of the intermediate jib 5b, and extends in a telescope shape. When retracting, when the sheave 14 is retracted together with the intermediate jib 5b, the wire 13 is loosened and the leading jib 5b is accommodated in the intermediate jib 5b by its own weight.

  The above is a case where there is one intermediate jib, but when there are a plurality of intermediate jibs, each intermediate jib is configured to be able to expand and contract in the same manner as the above-mentioned leading jib 5c. In addition, although the jib 5 mentioned above expands and contracts, there exists a thing of the type which consists of a single body and does not expand and contract.

  FIG. 1 shows a state in which the telescopic jib 5 is folded sideways on the boom 3 and is in a non-use state. However, when the jib 5 is switched from the storage state to the use state, the jib 5 is not shown in a side-up state. The boom 3 is turned by turning 90 ° by the cylinder, and the tip of the jib is connected to the sheave block 4 at the tip of the boom so that the jib 5 can be turned in the vertical plane. Next, after raising the boom 3 and then hanging the jib 5 vertically by the jib winch operation, the jib 5 is lifted by the jib winch operation, and the boom 3 is tilted to bring the jib 5 into the horizontal position. As shown in FIG. 3, the stay 16 is connected to the sheave block 4 at the tip of the boom. Reference numeral 17 in FIG. 3 indicates a hydraulic cylinder for tilting the jib 5.

  The details of storing the jib 5 and switching to the use state are disclosed in the following Patent Document 1 and are not a characteristic part of the present invention, so further explanation is omitted.

  In addition to this, there is a type of storing the sheave or switching it in the use state, and the type of turning the sideways with the boom tip side as a fulcrum is used. Requires work space. In order to reduce this work space, the following Patent Document 2 discloses one in which the jib is turned in a lateral direction while being folded.

That is, as shown in FIG. 4, a jib 23 is connected to a frame body 21 supported at the tip of a boom 19 so as to be pivotable horizontally by a shaft 18 by a pin 22 so as to be pivotable vertically in a vertical plane, After raising the boom 19, the jib 23 is bent downward with the pin 22 as a fulcrum by a hydraulic cylinder 24 that connects the frame 21 and the jib 23 (FIG. 5), and then the auxiliary hook that is hung on the sheave 26 at the upper end of the shaft 18. The winch operation of the auxiliary winding wire 27 turns the frame body 21 downward and turns it to the front side of the boom 19 together with the jib 23, and then raises the jib 23 by the hydraulic cylinder 24 to switch to the use state as shown in FIG. Yes.
JP-A-9-40373 JP-A-6-9191

  FIG. 6 shows a state in which the telescopic jib 5 shown in FIG. 2 is extended and connected to the tip of the boom. The jib 5 can be rotated vertically by a pin on the sheave block 4 at the tip of the boom as described above. 7 and is supported by a stay 16 so as to be supported by a boom at the tip of the boom. However, as the jib 5 is tilted, the support length l for supporting the jib 5 as shown in FIG. Becomes shorter and the stress concentration at the support portion becomes larger. Therefore, in terms of strength, conventionally, the angle of attack θ of the jib 5 shown in FIG. 6 cannot be made very small, and therefore the reach range of the auxiliary hook 13 suspended from the tip of the jib is limited.

  In addition, only the base jib 5a of the extended jib 5 is supported by the stay 16 on the sheave block 4, the intermediate jib 5b is supported by the base jib 5a, and the tip jib 5c is supported by the intermediate jib 5b. Therefore, there was a limit to the weight that could be lifted by the auxiliary hook.

  The conventional telescopic jib 5 is also configured such that the intermediate jib 5b is expanded and contracted by a hydraulic cylinder, and the tip jib 5c is expanded and contracted by a mechanism comprising a sheave and a wire. A mechanism consisting of a winch was required.

The first object of the present invention is to provide a boom type with a jib that can extend the reach range of the auxiliary hook by increasing the above-mentioned support length l for supporting the jib, thereby reducing the angle of attack θ of the jib. Is to provide a crane,
The second object is to increase the transportable weight that can be lifted by the auxiliary hook in the use state where the jib is extended in a boom-type crane with a jib in which the jib is extendable.

  A third object of the present invention is to provide a boom crane with a jib that can be expanded and contracted only by a mechanism comprising a sheave and a wire.

  The invention according to claim 1 relates to a boom type crane with a jib that achieves the first object, and is provided with a telescopic boom supported by a swivel base so as to be able to be tilted and tilted by a hydraulic cylinder for tilting, and the telescopic boom Can be switched between a storage position laid on the side and a use position in a state of being connected to the telescopic boom. The jib can be swiveled in a vertical plane at the use position, and can be pivoted to the tip of the telescopic boom. A frame that can be switched between a projecting position projecting on the extension of the arm and a storage position laterally mounted on the telescopic boom, and that rotates in conjunction with switching the jib to the use position and switches to the projecting position; And a support means for connecting the tip of the frame and the jib and supporting the jib.

  The present invention can be applied to a boom crane with a jib of the type shown in FIG. 1, and can also be applied to a boom crane with a jib of the type shown in FIG. When applied to the former crane shown in FIG. 1, the frame body is pivotally supported, for example, so as to be rotatable in a vertical plane at the boom tip. When the jib is connected to the sheave block 4 shown in FIG. 1, the frame body has transmission means for rotating the jib 5 in the vertical plane in conjunction with the rotation of the jib 5 in the vertical plane. When switching to the use position, the frame is switched from the storage position to the protruding position.

  When applied to the latter crane shown in FIG. 4, for example, as shown in the following embodiment, the jib base end is pivotally supported on the boom side base of the frame so that the jib can rotate in the vertical plane. At the same time, the frame is pivotally supported at the boom tip so as to be rotatable about an axis orthogonal to the boom. When the jib is rotated around the axis together with the frame body from the storage position, the frame body switches from the storage position to the protruding position.

  The invention according to claim 2 is applied to the latter crane shown in FIG. 4. In the invention according to claim 1, the frame can be rotated around an axis perpendicular to the boom at the tip of the boom. While being pivotally supported, the jib base end portion is pivotally supported by the boom-side base portion of the frame body so that the jib can rotate in a vertical plane.

  As the support means of the present invention, a stay 16 having a tilt hydraulic cylinder 17 as shown in FIG. 3 can be used, or from a winch for winding a wire, sheave and wire as shown in the following embodiment. A wire mechanism can be used.

  When the former stay is used, after the jib is switched to the use position, the jib and the frame body are connected by the stay as in the conventional case. Moreover, when using the said wire mechanism, a jib is supported so that raising / lowering is possible by winding operation of a winch.

  The invention according to claim 3 relates to a boom-type crane with a jib that achieves the second object, and is provided with a telescopic boom supported by a swivel base so that it can be tilted and tilted by a hydraulic cylinder for tilting, and the telescopic boom In a boom type crane with a jib that has a retractable jib that can be switched between a retracted position that is placed next to the telescopic boom and a use position that is connected to the telescopic boom, the jib that constitutes the telescopic jib that expands and contracts like a telescope is attached. A sheave to be worn, a winch attached to the swivel base, one end connected to the winch, and hung on the sheave via a guide sheave attached to the telescopic boom, and the other end is, for example, a telescopic jib base end, telescopic The telescopic jib is configured by a mechanism consisting of a wire fixed to the tip of the boom or the swivel, and at least the tip jib is among the plurality of jibs that telescopically expand and contract. Characterized by lifting.

  The invention according to claim 4 is the invention according to claim 3, wherein the sheave is attached to each jib constituting the telescopic jib, and a plurality of guide sheaves are coaxially supported at the distal end of the telescopic boom. One wire connected to the guide sheave and the sheave attached to each jib are alternately hooked in order.

  The invention according to claim 5 is the invention according to claim 3, wherein a plurality of guide sheaves are coaxially supported at the tip of the telescopic boom, a pair of sheaves are attached to both sides of the jib, and one wire is The guide sheave and the jib attached to each jib are alternately placed in order.

  The invention according to claim 6 relates to a boom-type crane with a jib that achieves the third object, and is provided with a telescopic boom supported by a swivel base so as to be able to be tilted and tilted by a hydraulic cylinder for tilting, and the telescopic boom In a boom-type crane with a jib that has a retractable position that is placed next to the telescopic boom and a telescopic jib that can be switched to a use position that is connected to the telescopic boom, a base jib, an intermediate jib that enters and exits from the base jib, Among the telescopic jibs that are telescope-like telescopic jibs that come in and out from the middle jib, the sheave attached to the tip of the base jib, the sheave attached to the tip of the intermediate sheave, and the tip of the tip jib One end is fixed to the intermediate jib rear end and the other end is hooked to the sheave of the intermediate jib tip B and the other end is fixed to the intermediate jib rear end. Is fixed to the part and the other end is characterized in that the more the second wire being fixed to the base jib.

  The pulling means used in the present invention includes a winch, and the first wire may be pulled directly by winding the winch, or can be slid to, for example, a base jib as shown in the following embodiments. And a wire mechanism consisting of a sheave to which the first wire is connected and a third wire that is hooked on the sheave and connected to the winch, and pulls the third wire by winding the winch. Thus, the first wire may be pulled by sliding the sheave.

  The invention according to claim 7 is the invention according to claim 5, wherein the attachment sheave is arranged on both sides of the base jib tip on both sides of the axis of the base jib and the attachment sheave is attached to the intermediate jib tip. It arrange | positions on both sides which pinch | interpose an axis of this, It is characterized by providing a pair of 1st wire and 2nd wire, respectively, and hanging on each sheave of each jib separately.

  In the inventions according to claims 6 and 7, there may be one or more intermediate jibs. When there are a plurality of intermediate jibs, a wire is hung on each intermediate jib in the same manner.

  The invention according to claim 8 is characterized in that, in the invention according to claim 6 or 7, a main winding wire is used as the traction means.

  According to the first aspect of the present invention, the distance between the connecting portion between the support means and the frame and the turning center where the jib rotates in the vertical plane can be increased as much as possible by increasing the length of the frame. By doing so, the stress at the support part is relaxed, the jib can be supported stably, and for that purpose, the jib angle of attack θ can be reduced and the reachable range of the auxiliary hook can be expanded. Rotating in conjunction with switching the jib to the use position, there is no need to rotate to switch the frame to the use position or the storage position. The frame body is not hindered during transportation or movement.

  According to the second aspect of the present invention, by rotating the jib, the frame body is switched to the protruding position protruding from the tip of the telescopic boom, and the jib is supported by being supported by the frame body and supported by the support means. Then, the frame is supported at two locations of the shaft support portion and the support means. And by lengthening a frame, the distance between a shaft support part and a support means can be lengthened, and there can exist an effect similar to the invention concerning Claim 1 by this. Further, in the present invention, the jib can be bent and rotated while being hung from the frame, and it is not necessary to take up a space when the jib is rotated. The jib can be manually rotated, but preferably, for example, as shown in FIG. 4, a wire 27 hung on a sheave 26 at the end of a shaft 25 that pivotally supports the frame body 21, particularly in the following embodiments. As shown, this is done using a supplementary wire.

  According to the invention which concerns on Claim 3, since the tip jib is supported by the wire among each jib which comprises an expansion-contraction jib even in the state which extended the expansion-contraction jib, the portable weight by a supplementary winding hook can be increased.

  According to the invention which concerns on Claim 4, while each several jib which comprises an expansion-contraction jib is each supported by one wire, a loadable weight can be increased more, and a jib is raised by winch operation which winds a wire. You can also.

  According to the invention according to claim 5, by supporting the jib on both sides by placing the wires on the sheaves arranged on both sides of the jib, the support of the jib is stabilized, and it becomes an obstacle when the auxiliary winding wire is passed through the upper surface of the jib. It can be avoided.

  According to the invention according to claim 6, it is possible to expand and contract the expansion and contraction jib by moving the intermediate jib and the tip jib by the winch operation for winding the wire, and the expansion and contraction can be performed only by a mechanism such as a sheave, a wire, and a winch. It is not necessary to use a hydraulic cylinder together as in the past.

  According to the invention which concerns on Claim 6, each jib which comprises an expansion-contraction jib can slide smoothly and reliably by the wire arrange | positioned at both sides, and can expand-contract.

  According to the invention which concerns on Claim 7, each jib can come in and out more smoothly and reliably.

  According to the invention which concerns on Claim 8, the expansion-contraction jib can be expanded-contracted using the existing main winding wire or the winch of this wire.

  FIG. 8 shows a boom-type crane vehicle with a jib when the telescopic jib 31 is stored sideways on the telescopic boom 32, and the base end of the frame 34 can be rotated by a shaft 33 at the distal end of the telescopic boom 32. The telescopic jib 31 is connected to the base of the frame body 34 by a pin 35 so as to be rotatable in a vertical plane, and the frame body 34 rotates around the shaft 33 together with the telescopic jib 31. The telescopic jib 31 can be switched between a retracted position that is laterally mounted on the telescopic boom 32 or a projecting position that projects from the distal end of the telescopic boom. 36 can be switched to the use position.

  In order to switch the telescopic jib 31 to the storage position or the use position, a wire mechanism is provided that supports the telescopic jib 31 so that it can be tilted. In this wire mechanism, as shown in FIG. 9, the base end is coupled to the distal end portion of the telescopic boom by a shaft 33, and the horizontal shaft 38 is common to the distal end portion of the frame body 34 that can be switched between the storage position and the protruding position. A large number of guide sheaves 39 that are pivotally supported by the shaft, sheaves 41a, 41b, and 41c that are attached to the tips of the base jib 31a, intermediate jib 31b, and tip jib 31c constituting the telescopic jib 31 and the swivel base 42. The unillustrated winch for raising and lowering the jib and one end of the winch are connected to the winch, and the sheave 41a of the base jib 31a, the sheave 39, the sheave 41b of the intermediate jib 31b, the guide sheave 39, and the sheave 41c of the tip jib 31c from the guide sheave 39 After passing through the guide sheave 39, the sheaves 41a, 41b, 41c and the guide sheave 39 alternately, the other end is fixed to the telescopic boom 32. Each wire 31a, 31b, 31c is suspended on the frame body 34 by a single wire 43, and each jib 31a, 31b, 31c is framed by the winding operation of the wire 43 by the winch. In contrast to 34, they are upset.

  In FIG. 10, a pair of sheaves 41a, 41b, 41c is attached to both sides of each jib 31a, 31b, 31c, and alternately passed over the guide sheave 39 and each sheave 41a, 41b, 41c in turn. , 31c is supported from both sides by a single wire 43, and the wire mechanism shown in FIG. 9 is simpler, but the later-described auxiliary winding wire 45 interferes with the sheaves 41a, 41b, 41c. On the other hand, in the wire mechanism shown in FIG. 10, each sheave 41a, 41b, 41c is arranged on both sides of the jib 31a, 31b, 31c, so that the auxiliary winding wire 45 is passed over the jib. There will be no hindrance. In any example, the intermediate jib 31b is composed of one jib, but when it is composed of a plurality of jibs, each jib is provided with a guide sheave and similarly supported by the wire 43.

  When the telescopic jib 31 is switched from the retracted position shown in FIG. 8 to the use position connected to the telescopic boom tip as shown in FIG. 15 to be described later, the telescopic boom 32 is first lifted by the raising / lowering hydraulic cylinder 40, The telescopic jib 31 is contracted by the winch operation for the wire 43 that suspends 31 and the frame body 34 is bent downward and suspended (FIG. 11).

  Next, the band 44 is wound around the lower part of the telescopic jib 31 that hangs down, and one end of the band 44 is hooked and connected to an appropriate position of the jib 31, and the other end is hooked on the auxiliary hook 36 that is lowered by a winch operation. After hooking, the auxiliary winding wire 45 is wound up by the winch operation for the auxiliary winding wire 45, the auxiliary hook 36 is pulled up, and the band 44 is pulled upward. Then, the band 44 tries to be unwound from the telescopic jib 31 and rotates the telescopic jib 31 around the shaft 33 together with the frame body 34.

  When the frame 34 is rotated halfway from the storage position, the frame 34 is switched to the protruding position protruding from the tip of the telescopic boom 32 as shown in FIG. In order to fix the expansion / contraction jib 31 to the protruding position, the expansion / contraction jib 31 and the frame 34 are connected by inserting a pin (not shown) that can be inserted and removed. The insertion of the pin can be performed by an operator after the boom 32 is returned to a horizontal position, but is preferably performed by remote control from the driver's seat using a device such as a hydraulic cylinder. In this case, it is not necessary to return the boom 32 to a horizontal position.

  Thereafter, the band 44 is removed from the telescopic jib 31, and then the auxiliary hook 36 is lowered by a winch operation, and the auxiliary winding wire 45 is loosened and the auxiliary winding wire 45 is attached to the distal end of the expansion jib as usual. Passed by inserting and removing pins. In this state, as shown in FIG. 12, the auxiliary hook 36 hangs down from the extensible jib tip, and when the auxiliary winding wire 45 is inserted by the winch operation in this state, the auxiliary hook 36 is hooked on the jib tip and the auxiliary winding wire 45 is inserted. When the auxiliary winding wire 45 is wound up, the telescopic jib 31 is lifted.

  FIG. 14 shows a mechanism for extending / contracting the expansion / contraction jib 31, which is removably attached to a sheave block 46 for attaching a main hook 48, and a main winding wire 49 is connected thereto.

  After an extended portion 49a of a hand extending from a cotter (not shown) is hung on a movable sheave 51 that is slidably attached to the base jib 31a among the jibs 31a, 31b, 31c constituting the telescopic jib 31 Although not shown, it is connected to and fixed to the sheave block 46, and a pair of sheaves 52 are attached to the front end of the base jib 31a and attached to both sides of the base jib 31a, and a pair of wires 53 are movable at one end. The mounting bracket 54 to which the sheave 51 is attached is provided with each other end connected to the rear end of the intermediate jib 31b. Similarly, a pair of sheaves 52 are attached to the front end of the intermediate jib 31b and attached to both sides of the intermediate jib 31b. One wire 55 is provided with one end connected to the base jib 31a and the other end connected to the tip end of the tip jib. ing.

  When the telescopic jib 31 is extended and put into use, the main winding wire 49 is wound up by operating the winch (not shown) for the main winding wire after the cotter (not shown) is removed from the sheave block 46, and the main winding hook 48 is used. To raise. If the main winding hook 48 reaches the guide sheave 39 and the main winding wire 49 is still wound in a state in which the main winding wire 48 cannot be raised any further, the extension portion 49a of the hand is pulled, and the movable sheave 51 slides. Then, the wire 53 is pulled by the movement, and the intermediate jib 31b is pushed out from the base jib 31a. When the intermediate jib 31b is pushed out, the wire 55 is pulled by the advancement of the sheave 41b at the tip of the intermediate jib, and the leading jib 31c is pushed out from the intermediate jib 31b.

  As shown in FIG. 13, when the telescopic jib 31 is connected to the telescopic boom tip and used in a telescope-like extended state, the frame 34 is first switched to the projecting position projecting from the telescopic boom distal end as described above. Fix it. At this time, the telescopic jib 31 is in a state of hanging from the tip of the lifted telescopic boom 32. Next, the telescopic boom 32 is raised and extended as usual, and then the wire 43 is wound up by a winch operation for raising and lowering the jib to lift the telescopic jib 31 substantially horizontally, and then the winch operation for the main winding wire is performed. Thus, the main winding wire 49 is wound up and the telescopic jib 31 is extended in a telescope shape as described above.

  FIG. 15 shows a use state in which the telescopic jib 31 connected to the distal end of the telescopic boom is extended, and FIG. 16 shows an enlarged view of a part of FIG.

  According to the crane of the present embodiment, as shown in FIG. 16, the expansion / contraction jib 31 is pivotally supported by the pin 34 on the frame body 34, and the respective jibs 31 a, 31 b, 31 c constituting the expansion / contraction jib 31 are formed on the guide jib 39. Although supported by the wire 43 to be hung, the distance L between the pin 35 and the shaft 38 to which the guide sheave 39 is attached can be increased by providing the frame 34 (this distance L lengthens the frame 34). As compared with the conventional one shown in FIG. 6, the stress at the support portion can be relaxed. Therefore, the angle of attack θ of the telescopic jib 31 can be reduced, the reachable range of the auxiliary hook 36 can be expanded, and each jib 31a, 31b, 31c constituting the telescopic jib 31 is supported by the wire 43, respectively. Compared to the conventional example in which only the base jib is supported, the weight that can be lifted by the auxiliary hook 36 can be increased, and the expansion / contraction of the respective jibs 31a, 31b, 31c constituting the expansion / contraction jib 31 is shown in FIG. As shown in the drawing, since it is performed only by the wire mechanism including the guide sheave 47, the wire 49a, and the winch, there are effects such as a simplified structure as compared with the conventional example.

Side view of a crane truck. The figure which shows the conventional mechanism which expands-contracts an expansion-contraction jib. The figure which shows the connection part of the expansion-contraction jib connected with an expansion-contraction boom. The side view of the principal part of a crane when an expansion-contraction jib is a non-use state. The side view of the principal part of the crane which shows the state which bent the expansion-contraction jib downward. The figure which shows when an expansion-contraction jib is in use condition. The figure which shows the connection part of an expansion-contraction boom and an expansion-contraction jib when an expansion-contraction jib is in use. The side view of the crane vehicle which concerns on this invention. The schematic perspective view of the wire mechanism which supports an expansion-contraction jib so that elevation is possible. The schematic perspective view of another example of a wire mechanism. The schematic diagram which shows a state when rotating a frame. The figure which shows the state which attached the auxiliary | assistant hook to the expansion-contraction jib front-end | tip part. The schematic perspective view which shows the expansion-contraction mechanism of an expansion-contraction jib. Schematic when the telescopic jib is in use. The enlarged view of FIG.

Explanation of symbols

31 ·· Telescopic jib 32 · · Telescopic boom 33 · · Shaft 34 · · Frame 35 · · Pin 36 · · Auxiliary hook 38 · · Horizontal shaft 39 · · Sheave 40 · · Tilting hydraulic cylinders 41a, 41b and 41c , 52 ·· Sheave 43 · · Sheave lifting wire 44 · · Band 45 · · Supplementary winding wire 46 · · Sheave block 48 · · Main winding hook 49 · · Main winding wire 51 · · Movable sheave 53, 55 · · Wire 54 ・ ・ Mounting bracket

Claims (8)

  Can be switched between a telescopic boom supported by a swivel base and tilted by a hydraulic cylinder for raising and lowering, a storage position that is placed next to the telescopic boom, and a use position that is connected to the telescopic boom. The jib can be swiveled in a vertical plane at the use position, can be rotated to the tip of the telescopic boom, and can be switched between a projecting position projecting on the extension of the boom and a retracted position lying on the telescopic boom. And a frame that rotates in conjunction with the switching of the jib to the use position and switches to the protruding position, and a support means for connecting the tip of the frame and the jib and supporting the jib. A boom type crane with a jib.   The frame body is pivotally supported at the boom tip portion so as to be rotatable around an axis orthogonal to the boom, and the jib base end portion can be pivoted on the boom side base portion of the frame body in a vertical plane. The boom-type crane with a jib according to claim 1, wherein the boom-type crane is supported by a shaft.   The telescopic boom supported by the swivel base so that it can be tilted up and down, and can be switched between a telescopic boom that tilts up and down with a hydraulic cylinder for tilting, a retracted position that is laid on the telescopic boom, and a use position that is connected to the telescopic boom. In a boom-type crane with a jib that has a telescopic jib, a sheave that is attached to a jib that forms a telescopic jib that telescopically expands and contracts, a winch that is attached to the swivel, and one end connected to the winch for expansion and contraction The telescopic jib is configured by a mechanism comprising a wire that is hooked to the sheave via a guide sheave attached to the boom and the other end is fixed, and at least the plurality of jibs that telescopically expand and contract. A boom crane with a jib characterized by supporting the jib.   The sheave is attached to each jib constituting the telescopic jib, and a plurality of guide sheaves are coaxially supported on the tip of the telescopic boom, and one wire connected to the winch is connected to the guide sheave and each jib. The boom type crane with a jib according to claim 3, wherein the crane is attached to the mounting sheave alternately.   A plurality of guide sheaves are coaxially supported at the tip of the telescopic boom, a pair of sheaves are attached to both sides of the jib, and one wire is alternately placed in turn on the guide sheave and the sheave attached to each jib in order. The boom type crane with a jib according to claim 3, which is hung.   The telescopic boom supported by the swivel base so that it can be tilted up and down, and can be switched between a telescopic boom that tilts up and down with a hydraulic cylinder for tilting, a retracted position that is laid on the telescopic boom, and a use position that is connected to the telescopic boom. In a boom type crane with a jib having a telescopic jib, a base jib is composed of a base jib, an intermediate jib that enters and exits from the base jib, and a tip jib that enters and exits from the intermediate jib. A sheave attached to the tip, a sheave attached to the tip of the intermediate sheave, and a sheave at the tip of the tip jib, one end is fixed to the rear end of the intermediate jib and the other end is pulled A first wire connected to the means, and a second wire hooked to the sheave of the intermediate jib tip B, one end fixed to the leading jib rear end and the other end fixed to the base jib With features Jib with boom crane according to claim 5, wherein that.   An attachment sheave is disposed on both sides of the base jib tip on both sides of the axis of the base jib, and an attachment sheave is disposed on both sides of the intermediate jib on the sides of the axis of the intermediate jib. A boom type crane with a jib according to claim 5, wherein a pair of said wires are provided and hung individually on sheaves on both sides of each jib.   8. A boom crane with a jib according to claim 6 or 7, wherein a main winding wire is used as the traction means.

Images