WO2000040498A1 - Mobile crane device with auxiliary jib - Google Patents

Abstract

A mobile crane having a telescoping boom (3) which is formed to be inclined downward from its base end part (3a) to its top end part (3b) and to be low above the ground at the lower portion of its top end part (3b) and an auxiliary jib (10) installed detachably at the top end part (3b) of the telescoping boom (3), wherein, when the auxiliary jib (10) is moved from a stored position in which the jib is stowed on the side of the telescoping boom (3) to an operating position in which the jib is installed on the telescoping boom (3) forward from the top end part (3b) of the telescoping boom (3), a jib main body (12) is elevated upward relative to a jib base stand (11) positioned at the side of the top end part (3b) of the telescoping boom (3) in rearwardly directed position, the jib base stand (11) is rotated from the rearwardly directed position to a forwardly directed position about a rotating pivot pin (25) under this elevated position so as to change its position and, after the jib base stand (11) is fixed to the top end part (3b) of the telescoping boom (3) with a fixing pin (26), the jib main body (12) is lowered so as to extend the jib to the forward telescoping side of the telescoping boom (3) for installation and, the storing operation of the auxiliary jib (10) from the operating position can be performed in the order reverse to that taken in the installation operation.

Description

 Specification

 Mobile crane with auxiliary jib

Technical field

 The present invention relates to a movable crane device with a detachable auxiliary jib.

Background art

 Conventionally, a mobile crane device with an auxiliary jib that has an auxiliary jib and can be added to the end of the telescopic boom as needed has been proposed. When the auxiliary jib is not used, the auxiliary jib is stored and held sideways on the side of the telescopic boom with the distal end of the auxiliary jib facing the base end of the telescopic boom. When using the auxiliary jib, the base end of the auxiliary jib located on the side of the distal end of the telescopic boom is rotatable in a vertical plane with respect to the distal end of the telescopic boom. In this state, while raising the telescopic boom in this state, the catching jib is gradually swung downward, and finally mounted on the front end face side of the telescopic boom, a so-called “downward swinging type” mounting method. It is common to take.

 However, in such a mobile crane device having an auxiliary jib of the downward swing type, the telescopic boom is raised when the auxiliary jib is mounted, and the auxiliary jib is swinged from below the movable boom. However, the work of installing the auxiliary jib requires a relatively large work space, and the work of installing the auxiliary jib may be difficult depending on circumstances around the work site.

After swinging out the auxiliary jib to the distal end side of the telescopic boom, the telescopic boom is folded down, and the distal end of the telescopic boom and the base end of the auxiliary jib are connected and fixed by a fixing pin. In the insertion work, this is extended by the operator. _C If this move to the distal portion of the reduced boom to check the status of the connecting portion performs pin Hama揷, the above telescopic boom in the conventional general that is adapted to hold a generally horizontal orientation in its storage condition Therefore, although the retracted state is high, the height of the distal end of the telescopic boom is high above the ground, and therefore, the work of checking the connection state between the distal end of the telescopic boom and the auxiliary jib, the force, and the fixing pin It is difficult for the worker to perform the work from the ground, and the worker must move between the ground and the tip of the telescopic boom when performing the work, which has a problem that the work is complicated and the workability is poor. .

 In view of the above, the present invention has been made in the mobile crane apparatus with the auxiliary jib so that the auxiliary jib can be attached and detached in a small working space, and can be performed easily and with good workability. is there.

Disclosure of the invention

 According to one aspect of the present invention, the base (3a) of the telescopic boom (3) can be raised and lowered on a swivel (2) that is mounted on a frame (la) of the vehicle (1) so as to be able to swivel. And is driven up and down by an undulating hydraulic cylinder (6) arranged between the swivel (2) and the swivel (2), and when the telescopic boom (3) is stored in the vehicle (1) side. The telescopic boom (3) is configured to incline downward from the base end (3a) toward the front end (3b) in the vehicle length direction of the vehicle (1).

A movable crane device with an auxiliary jib, in which an auxiliary jib (10) can be detachably attached to a distal end (3b) of the telescopic boom (3), wherein the auxiliary jib (10) is A jib base (11) whose base end (11a) is detachably connected to a front end (3b) of the telescopic boom (3), and a front end of the jib base (11). Part (lib) and a jib body (12) with its base end (12a) connected to it. When the telescopic boom (3) is in the retracted state, the jib base (11) is rotated by a pivoting fulcrum pin (25) whose orientation is set so that its axis is substantially vertical. A rearward pointing posture in which the distal end (12b) is directed toward the base end (3a) of the telescopic boom (3) at the side of the distal end (3b) of (3); At the front side of the tip (3b) of (3), the attitude can be changed between a front-pointing attitude in which the tip (12b) is directed forward in the direction of expansion and contraction of the telescopic boom (3). As described above, the telescopic boom (3) is rotatably supported by the distal end (3b), and in the above-mentioned front-facing posture, the detachable fixing pin (26) allows the tip of the telescopic boom (3). While being configured to be fixedly located at the end (3b),

The jib base (1 2) is moved by the jib up / down driving means (16) arranged between the jib base (11) and the jib base (11) in the retracted state of the telescopic boom (3). The jib base (11) can be raised above the jib base (11) around a jib pivot (13) which is substantially perpendicular to the rotation fulcrum pin (25). The movable crane device is provided. _{C With} this configuration, the auxiliary jib 10 is mounted. The fitting of the rotation fulcrum pin 25 and the fixed pin 26 required for the storing operation is performed.揷 The operator can easily perform the removal operation and check the state at that time from the ground. For example, the height of the distal end 3b of the telescopic boom 3 is high and the auxiliary jib 10 When the worker must move between the ground and the tip 3b of the telescopic boom 3 during the storage operation Compared to both the workability is improved in mounting and storage operations of the auxiliary jib 1 0, safety or reliability of the work is improved because the confirmation operation is easy and reliable. The auxiliary jib 10 attached to the distal end portion 3b of the telescopic boom 3 moves the telescopic boom 3 from the retracted posture to the side of the telescopic boom 3 in a horizontal holding state. When the working posture is set in a state of being mounted on the front side of the front end 3 b of the boom 3, the jib base 1 which is positioned in a rearward-facing posture on the side of the front end 3 b of the telescopic boom 3. 1, the jib body 12 is raised above the jib base 11 around a jib pivot shaft 13 that is substantially perpendicular to the rotation fulcrum pin 25. Then, the jib base 11 is rotated from the rear-facing posture to the front-facing posture around the rotation fulcrum pin 25 to change the posture, and the jib base 11 is moved by the fixing pin 26. After being fixed to the distal end 3 b of the telescopic boom 3, the jib body 12 is folded down so that the telescopic boom 3 can be attached to the telescopic boom 3 so as to protrude forward in the telescopic direction of the telescopic boom 3. When the storage jig is retracted from the working posture, the above-mentioned catching jib 10 Attachment of the telescopic boom 3 to the distal end 3b of the telescopic boom 3 ・ There is no need to raise the telescopic boom 3 during the storage operation. The storage operation can be easily performed in a smaller work space, and the effect is more remarkable especially when the jib work using the auxiliary jib 10 is performed at a work site where there is not enough room for the work space. .

In a state where the jib base 11 of the auxiliary jib 10 is set to the front pointing posture and the jib body 12 is raised up to the maximum raised position with respect to the jib base 11, Almost the entire jib body 12 can be configured to be located closer to the base end 3 a of the telescopic boom 3 than the front end position of the base end 12 a of the jib body 12. With this configuration, even when there is a vertical obstacle such as a wall surface in front of the telescopic boom 3 during the work of mounting the auxiliary jib 10, the base end of the jib main body 12 can be used. By monitoring the presence or absence of interference between 12a and the above-mentioned wall surface, and by monitoring from the ground by the operator, the danger of interference between the jib body 12 and the wall surface can be reliably avoided. As a result, the safety in mounting the auxiliary jib 10 is improved.

Embodiment

 Hereinafter, preferred embodiments of the mobile crane device according to the present invention will be specifically described with reference to the drawings. In the figure,

 FIG. 1 is a side view showing a first embodiment of a mobile crane device with an auxiliary jib according to the present invention;

 Fig. 2 is an enlarged view of the connection between the telescopic boom and the auxiliary jib in the mobile crane with auxiliary jib shown in Fig. 1;

 FIG. 3 is a view taken in the direction of arrows I I I-I I I in FIG. 2; and

 FIG. 4 is a side view showing a mobile crane device with an auxiliary jib according to a second embodiment of the present invention.

FIG. 1 shows a mobile crane device Z with an auxiliary jib according to a first embodiment of the present invention. The mobile crane apparatus Z according to this embodiment has a swivel 2 mounted on a frame 1 a of a vehicle 1 so as to be able to swivel, and a base end 3 of a telescopic boom 3 at an upper end of the swivel 2. a (that is, the base end of the base boom 3 mm) is pivotally supported by a boom fulcrum shaft 9 so that it can be raised and lowered in the vertical direction, and a hydraulic cylinder 6 for raising and lowering is arranged between the swivel 2 and the swivel 2. It is driven up and down. The telescopic boom 3 is stored in a fully contracted state as shown in FIG. 1. In the retracted state of the telescopic boom 3, the telescopic boom 3 is moved from its base end 3a to its distal end 3b. and inclined downward toward, and as the tip portion 3 b is located in the lower position than the upper surface of the frame 1 _a of the vehicle 1, the posture in the storage state of the telescopic boom 3 has been set. An auxiliary jib 10 described below is detachably attached to the distal end 3 b of the telescopic boom 3. To attach this auxiliary jib 10 A pair of upper and lower boom-side first brackets 21 and 21 are provided on one side surface of the end portion 3 b of the telescopic boom 3, that is, one side surface of the boom head 4 provided at the end of the top boom 3 B. A pair of upper and lower boom-side second brackets 22 and 22 are provided on the other side surface, respectively.

 As shown in FIGS. 1 to 3, the auxiliary jib 10 has a divided structure including a jib base 11 and a jib body 12 described below.

The jib base 11 is removably mounted on the front side of the boom head 4 located at the distal end 3 b of the telescopic boom 3. One of the base ends 11 a is provided. A pair of upper and lower jib-side first brackets 23 and 23 are provided on the side surface of the jib, and a pair of jib-side second brackets 24 and 24 at the upper and lower positions are provided on the other side surface. As shown in FIGS. 2 and 3, the jib base 11 is provided with the jib-side first brackets 23, 23 provided on the one side surface, respectively. 5 and connected to the boom-side first brackets 21 and 21 provided on one side surface of the boom head 4, respectively, by being rotated about the rotation fulcrum pin 25. A “rear-pointing posture” which is located on the side of the boom head 4 and whose tip 11 b is directed toward the base 3 a of the telescopic boom 3 (shown by a chain line in FIG. 2; A posture shown in solid lines in FIG. 3) and a “forward-facing posture” in which the front end of the boom head 4 is swung to the front and the front end 11 b thereof is directed forward in the telescopic direction of the telescopic boom 3 (see FIGS. 2 and 3). The posture can be changed between the positions shown in solid lines in Fig. 3). Then, in a state where the jib base 11 is set to the “forward-directed posture”, the boom-side second brackets 22 and 22 on the boom head 4 side and the jib on the jib base 11 side are set. The side second brackets 24, 24 are overlapped in the vertical direction, and the two are connected by a fixing pin 26 so that the jib base 11 is positioned on the front side of the boom head 4 as shown in FIG. Previous It will be fixed in the “directional orientation”. In addition, a base end 12a of the jib body 12 described below is connected via a jib pivot shaft 13 to a lower position of a distal end 11b of the jib base 11 and an upper position. Is connected to one end of a hydraulic cylinder 16 described below via a cylinder fulcrum pin 14.

 In this embodiment, as shown in FIG. 1, the axis of the rotation fulcrum pin 25, that is, the turning center axis L of the jib base 11 is placed in the retracted position of the telescopic boom 3. In the state where the telescopic boom 3 is set in the vertical direction, the telescopic boom 3 is tilted forward by an appropriate angle (in this embodiment, the descending tilt angle in the retracted state of the telescopic boom 3). . Further, both the rotation fulcrum pin 25 and the fixed pin 26 are detachable. The jib body 12 is composed of a telescopic beam having a predetermined length, and a base end 12 a of the jib base 11 is located below a tip end 11 b of the jib base 11. The portion is connected to the portion via the jib pivot shaft 13 disposed in a direction perpendicular to the axis of the pivot pin 25 so as to be able to move up and down. In addition, a hydraulic cylinder 16 (between the scope of the patent request) is provided between the base 12a of the jib body 12 near the base 12a and the upper part of the tip 12b of the jib body 12. The jib body 12 is driven up and down at the tip 1 1 b of the jib base 11 by the expansion and contraction of the hydraulic cylinder 16. Is done.

 In this case, the hydraulic cylinder 16 selectively takes the fully extended state and the fully contracted state, and depends on the posture of the jib body 12 corresponding to the telescopic state of the hydraulic cylinder 16. The auxiliary jib 10 (that is, the combined body of the jib base 11 and the jib main body 12) selectively takes the following four positions as shown in FIG.

First, the first position is the “retracted position” of the auxiliary jib 10. In the "delivery posture", the hydraulic cylinder 16 is in a fully extended state, and the jib body 12 extends forward from the jib base 11 set in the "backward-oriented posture", and the auxiliary jib 1 As a whole, it is arranged sideways on the side of the telescopic boom 3. Hereinafter, for convenience of description, this “storage attitude” is indicated by (10Λ) in parentheses after 10 in each figure.

 The second posture is the “first raising posture” of the auxiliary jib 10. In the “first raising posture”, the hydraulic cylinder 16 is in the fully contracted state, and the jib body 12 Is raised up to the maximum position from the jib base 11 set in the “backward-oriented posture”. Hereinafter, the “first supine posture” is indicated by (10 B) in parentheses after the reference numeral 10 in each figure.

 The third position is the “second raising position” of the auxiliary jib 10. In the “second raising position”, the hydraulic cylinder 16 is in the fully contracted state, and the jib body 12 Is raised up to the maximum position from the jib base 11 set in the “forward-facing orientation”, and the jib base 11 in the “first elevation orientation” is set to the “back-facing orientation”. This is the posture obtained by turning the camera to the “forward-facing posture”. Hereinafter, the “second supine posture” is indicated by (10 C) in parentheses after 10 in each figure.

 The fourth posture is the “working posture” of the auxiliary jib 10. In the “working posture”, the hydraulic cylinder 16 is in the fully extended state, and the jib body 12 is in the “forward-facing posture”. The jib base 11 is set in a downward position and is inclined downward by a predetermined angle from the axis of the telescopic boom 3. Hereinafter, this “working posture” is denoted by (10D) in parentheses after 10 in each figure.

Note that the jib base 11 changes the posture between the “front-facing posture” and the “back-facing posture” (in other words, the “first raising posture” and “ 2) is performed by the turning drive mechanism 30 shown in FIG. That is, the turning drive mechanism 30 is composed of a hydraulic cylinder 31 and two levers 32, 33. The hydraulic cylinder 31 has a tube-side end having the jib base. The other end of the second lever 33 whose one end is connected to the base end 11a of the jib base 11 while the rod end is connected to the center of the base 11 It is connected to. Further, one end of the second lever 33 is connected to the other end of the first lever 32 connected to the boom head 4 side. The jib base 11 is rotationally driven via the levers 32 and 33 by the expansion and contraction of the hydraulic cylinder 31.

 According to the mobile crane device Zi according to the first embodiment configured as described above, the synergistic effect of the posture of the telescopic boom 3 in the retracted state and the mounting method of the auxiliary jib 10 is achieved. Therefore, the following specific effects can be obtained.

That is, according to the mobile crane apparatus Z of this embodiment, the telescopic boom 3 having the auxiliary jib 10 removably attachable to the distal end 1 Ob thereof is stored in the vehicle 1 in the retracted state. In the vehicle length direction from the base end 3a to the tip 3b, and the tip 3b is positioned lower than the upper surface of the frame 1a of the vehicle 1. Since the ground height of this part is kept low, the operation of inserting / removing the rotation fulcrum pin 25 and the fixing pin 26 necessary for mounting This can be easily confirmed by the operator from the ground. For this reason, for example, the height of the distal end 3 b of the telescopic boom 3 is high above the ground, as in the conventional case, and when the auxiliary jib 10 is mounted and stored, the worker moves between the ground and the distal end 3 b of the telescopic boom 3. If you have to move the ratio Therefore, the workability in mounting and storing the auxiliary jib 10 is improved, and the safety and reliability of the work are improved because the confirmation work at that time is easy and reliable. Become.

 On the other hand, the auxiliary jib 10 attached to the distal end portion 3b of the telescopic boom 3 changes the posture from the `` storage posture '' to the `` working posture '' when the auxiliary jib 10 is mounted. The jib main body 12 is raised upward with respect to the jib base 11 located in the “backward orientation” on the side of the distal end 3 b of the telescopic boom 3, and the auxiliary jib 10 is moved to “ In this state, the jib base 11 is rotated about the rotation fulcrum pin 25, and the jib base 11 is changed from the "backward-oriented posture" to the "forward-oriented posture". Thus, the auxiliary jib 10 is set to the “second raising posture”. Then, in this “second upright posture”, the jib base 11 is fixed to the distal end portion 3 b of the telescopic boom 3 by the fixing pin 26, and then the jib body 12 is lowered. By doing so, the auxiliary jib 10 is set to the “working posture” that projects toward the front side in the telescopic direction of the telescopic boom 3. In addition, the operation of changing the posture of the auxiliary jib 10 from the “working posture” to the “storage posture” is performed in a reverse procedure to the mounting operation. Therefore, according to the mobile crane apparatus Z: there is no need to raise the telescopic boom 3 at the time of attaching and retracting the auxiliary jib 10 to the distal end portion 3b of the telescopic boom 3; For example, compared to the case where the auxiliary jib 10 is attached to the front side of the telescopic boom 3 by swinging downward, the above-mentioned auxiliary jib 10 can be easily attached and stored in a smaller work space. The above-mentioned auxiliary jib can be used especially at a work site where there is not enough room for work space.

The effect becomes more remarkable when performing a jib operation using 10. FIG. 4 shows a mobile crane device Z with an auxiliary jib according to a second embodiment of the present invention. This mobile crane device Z or the first The basic structure of the mobile crane apparatus Z according to the present embodiment is the same as that of the mobile crane apparatus Z, except that the arrangement structure of the rotation fulcrum pin 25 and the auxiliary jib 10 These are the “first raising posture” and the “second raising posture”. That is, in the present embodiment, first, the first pivot, which is a pivot point between the “front-pointing attitude” and the “back-pointing attitude” of the jib base 11 of the auxiliary jib 10, is used. The axial direction of the fulcrum pin 25 is set closer to the vertical line than in the mobile crane apparatus Z of the first embodiment. By setting the direction of the axis of the rotation fulcrum pin 25 as shown in (2), the jib base 11 is rotated between the “forward-directed posture” and the “rear-directed posture” by the rotation drive mechanism 30. When the auxiliary jib 10 is moved to change the posture between the “first raising posture” and the “second raising posture”, the auxiliary fulcrum 10 rotates around the rotation fulcrum pin 25 due to its own weight. Accordingly, the momentary force of the auxiliary driving jig 10 can be reduced in size and weight, and the work of changing the position of the auxiliary jib 10 can be performed safely and quickly.

Second, by appropriately setting the position of the hydraulic cylinder 16 between the jib base 11 and the jib body 12, the hydraulic cylinder 16 is fully contracted and the jib body 1 2 is in the maximum raised position, that is, the vertical direction of the jib body 12 in the “first raising posture” or the “second raising posture” of the auxiliary jib 10 is as vertical as possible. Approaching. As a result, even if the auxiliary jib 10 is set to any of the “first raising posture” and the “second raising posture”, the jib body 12 will not The jib body 12 is located closer to the base end 3 a of the telescopic boom 3 than the front end 12 of the base end 12 a of the jib body 12 in the “upright posture”. As a result, at the time of mounting the auxiliary jib 10, for example, even if a vertical obstacle such as a wall surface exists in front of the telescopic boom 3, the base end of the jib body 12 By monitoring the presence or absence of interference between the 12a and the above-mentioned wall surface, and the operator monitoring from the ground, the danger of interference between the jib body 12 and the wall surface can be reliably avoided. This further improves the safety of the mounting work of the tenth embodiment.

 Since the configuration other than the above and the operation and effect based on this are the same as in the case of the above-mentioned 19 according to the above-described first embodiment, the description here will be made with reference to the corresponding description in the above-mentioned first embodiment. Omitted.

Claims

The scope of the claims (1) the vehicle (1) to the frame (1 _a) pivots freely mounted on the swivel stand on (2), the elastic base end of the boom (3) (3 a) contoured rotatably connected to and the This is driven up and down by an undulating hydraulic cylinder (6) arranged between the swivel (2) and the telescopic boom (3) when the telescopic boom (3) is stored in the vehicle (1) side. (3) is configured so as to be inclined downward from the base end (3a) to the front end (3b) in the vehicle length direction of the vehicle (1).  A movable crane device with an auxiliary jib, in which a catching jib (10) can be detachably attached to a distal end (3b) of the telescopic boom (3), wherein the auxiliary jib (10) The jib base (11) whose base end (11a) is detachably connected to the distal end (3b) of the telescopic boom (3) and the jib base (11) A jib body (12) having a distal end (lib) and a proximal end (12a) connected thereto;  When the telescopic boom (3) is in the retracted state, the jib base (11) is rotated by a pivoting fulcrum pin (25) whose orientation is set so that its axis is substantially vertical. A rearward pointing posture in which the distal end (12b) is directed toward the base end (3a) of the telescopic boom (3) at the side of the distal end (3b) of (3); At the front side of the tip (3b) of (3), the attitude can be changed between a front-pointing attitude in which the tip (12b) is directed forward in the direction of expansion and contraction of the telescopic boom (3). As described above, the telescopic boom (3) is rotatably supported by the distal end portion (3b) of the telescopic boom (3), and is detachable in the above-mentioned front-facing posture by the detachable fixing pin (26). While being configured to be fixedly located at the tip (3b), The jib body (1 2) is in the retracted state of the telescopic boom (3). The jib base (11) is substantially perpendicular to the rotation fulcrum pin (25) with respect to the jib base (11) by the jib up / down driving means (16) arranged between the jib base (11) and the jib base (11). A mobile crane device characterized in that it can be raised above the jib base (11) around a jib pivot (13). (2) The jib base (11) of the auxiliary jib (10) is set to the forward pointing posture, and the jib body (12) is raised up to the jib base (11). In the state where the jib body (12) is raised to the position, substantially the entirety of the jib body (12) is located closer to the extension boom (3) than the front end position of the base end (12a) of the jib body (12). 2. The crane device according to claim 1, wherein the crane device is configured to be located closer to the base end (3a).