JP2019064805A - Mobile crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile crane capable of easily specifying a turning direction capable of exhibiting the highest performance from the appearance. SOLUTION: The rough terrain crane 1 of the present invention is installed on a vehicle body 10, a swivel table 12 rotatably installed on the vehicle body 10, a boom 14 undulatingly installed on the swivel table 12, and a vehicle body 10. The outrigger 11 is provided, and the mark 2 (3, 4) for specifying the turning direction capable of exhibiting the highest performance is arranged at a position visible from the outside. [Selection diagram] Fig. 1

Description

  The present invention relates to a mark when installing a mobile crane.

  Generally, in mobile crane performance, the forward stability varies with the position of the overturning fulcrum. That is, the linear direction connecting the outrigger jack and the turning center is the turning direction in which the performance is the highest. That is, performance is enhanced when the boom is positioned in the direction of the outrigger jack, and degraded when the boom is positioned between the outrigger jack and the outrigger jack.

  Although there is such a fact, conventionally, the performance has been set to the same value in accordance with the lower performance side for the entire circumference (full turning range) of the mobile crane. However, in recent years, in response to an increasing demand for higher performance, it has been proposed to increase the performance when the boom is positioned in the direction of the outrigger (see, for example, Patent Documents 1 and 2).

JP, 2015-101470, A JP-A-9-2782

  However, since it was difficult to identify the position of the turning center from the appearance, the conventional mobile crane was hard to specify the turning direction that provides the best performance. For this reason, the case where the installation operation of the mobile crane and the confirmation of the turning direction using the safety device were repeated many times occurred.

  Then, this invention aims at providing a mobile crane which is easy to specify the turning direction which can exhibit the highest performance from an external appearance.

  In order to achieve the above object, a mobile crane according to the present invention is provided on a vehicle body, a swivel mounted on the vehicle, a boom mounted on the swivel, and a boom mounted on the vehicle. A mobile crane comprising: an outrigger, wherein a mark for specifying a turning direction capable of achieving the highest performance is arranged at a position visible from the appearance.

  As described above, the mobile crane according to the present invention is a mobile crane including a vehicle body, a swivel base, a boom, and an outrigger, and a mark for identifying a swing direction capable of exhibiting the highest performance is an appearance. It is characterized in that it is disposed at a position visible from Therefore, it is easy for the induction person outside the rough terrain crane 1 to specify the turning direction which can exhibit the highest performance from the appearance.

It is a side view of a rough terrain crane. It is a side view of the body of the rough lane crane which shows the position of a mark. It is an enlarged view of the mark arrange | positioned at the side of a vehicle body. (A) is a logo mark and (b) is a scale. It is a perspective view of a mark arranged at two places. It is explanatory drawing which shows the performance of the conventional concept of a mobile crane. FIG. 5 is an illustration showing the performance of the new concept of mobile cranes. It is a case where the center of performance coincides with the turning center. FIG. 5 is an illustration showing the performance of the new concept of mobile cranes. In this case, the center of performance does not coincide with the center of turning.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Hereinafter, although a rough terrain crane is demonstrated to an example as a mobile crane, it is not limited to this. The present invention can be applied to other mobile cranes such as all terrain cranes and truck cranes.

(overall structure)
First, the overall configuration of the rough terrain crane 1 as a mobile crane will be described using FIG. 1. The rough terrain crane 1 according to the present invention is, as shown in FIG. 1, horizontal to the vehicle body 10 as a main body of a vehicle having a traveling function, outriggers 11 provided at four corners of the vehicle body 10,. It has a swivel base 12 pivotally mounted, and a boom 14 mounted on a bracket 13 provided upright on the swivel base 12.

  The outrigger 11 has a slide cylinder 11a extending in the lateral direction (substantially horizontal direction) and a jack cylinder 11b extending in the longitudinal direction (substantially vertical direction) from the vicinity of the tip of the slide cylinder 11a. The slide cylinder 11a can be extended and retracted to slide out / slide from the vehicle body 10 outward in the width direction, and the jack cylinder 11b can extend and retract from the vehicle body 10 in the vertical direction. It is.

  The swivel base 12 has a pinion gear to which the power of the swiveling motor is transmitted. The pinion gear is engaged with a circular gear provided on the vehicle body 10 so as to rotate around the swivel center. Therefore, it is difficult to identify the position of the turning center from the appearance. Furthermore, the swivel base 12 has a cab 18 disposed on the front left side, a bracket 13 disposed on the rear center, and a counterweight 19 disposed on the rear lower part.

  The boom 14 is telescopically configured by the base end boom 141, the intermediate boom 142, and the tip boom 143, and can be extended and retracted by an extension cylinder disposed inside.

  The outermost proximal boom 141 is pivotably attached to a support shaft whose base is horizontally installed on the bracket 13. Furthermore, a relief cylinder 15 is bridged between the bracket 13 and the lower surface of the base end boom 141, and by extending and retracting the relief cylinder 15, the whole boom 14 can be raised and lowered. A sheave is disposed at the tip end boom head 144 of the tip boom 143, and the wire rope 16 is wound around the sheave so that the hook block 17 is suspended.

(Structure of the mark)
Then, as shown in FIG. 2, in the present embodiment, the mark 2 for identifying the turning direction capable of exhibiting the highest performance is disposed at a position which can be viewed at one time from the induction person outside the rough terrain crane 1. ing. The marks 2 of the present embodiment are disposed at two places spaced apart from each other, and specifically, the jack 3 (11b) of the outrigger 11 which is the first mark and the second mark And a mark 4 disposed on the side surface of the vehicle body 10.

  The upper end portion of the jack 3 (11b) of the outrigger 11, which is the first mark, is at a position farthest from the vehicle body 10 of the mobile crane 1 and at a position where the induction person can easily see. In addition, it is also preferable to install marks, such as a rod, in the upper end surface of the jack 3 of the outrigger 11 as a 1st mark. In addition to this, it is also possible to paint the upper end of the jack 3 of the outrigger 11 to make it stand out.

  The mark 4 which is the second mark is installed on the side surface (fender of the vehicle body 10). Specifically, there are four marks 4 corresponding to the jacks 3 (11b) of the four outriggers 11, each located above the tire. More precisely, the four marks 4 are respectively a straight line connecting the axis of the jacks 3 (11b) of the four outriggers 11 and the turning center O of the turning base 12 in plan view with the side of the vehicle body 10 It is arranged at the intersection position.

  Here, the arrangement of the marks 4 is not limited to the above-described position. That is, when the center point of the performance does not coincide with the turning center O, as shown in FIG. 7, the mark 4 is placed on a straight line connecting the axis of the jack 3 (11b) of the outrigger 11 and the highest performance position. It should be arranged. Furthermore, the mark 4 may not be disposed on the side surface of the vehicle body 10, and the mark 4 may be installed on the upper surface of the vehicle body 10 via a support arm (bracket) or the like.

  Furthermore, the number of marks 4 is not limited to one for each outrigger 11. That is, in the performance setting of the present invention, the maximum performance may be set not only for the maximum extension width of the outrigger 11 but also for the middle extension width. Then, it is necessary to shift the position of the mark 4 depending on the extension width of the outrigger 11. In this way, the marks 4 in the direction of each outrigger 11 can also be arranged not necessarily at one position but at a plurality of positions. In that case, it is also preferable to attach the mark 4 by changing the color and design for each overhang width.

  Here, the specific design etc. of each mark 4 may be any design (or color) as long as it is easy to view, as shown in, for example, FIGS. 3 (a) and 3 (b). Things are considered. FIG. 3 (a) is a case where the mark 4 is a logo mark (4A), and FIG. 3 (b) is a case where the mark 4 is a grid (division) (4B) so that the left and right positions can be easily understood. .

  And, the jack 3 which is the first mark and the mark 4 which is the second mark are in a position where they can be viewed simultaneously from the guider standing outside the rough terrain crane 1. Furthermore, since the jack 3 and the mark 4 are on the lower side and the mark 4 on the upper side, the jack 3 and the mark 4 can be seen from above and below as viewed from the guider.

(Action)
Next, the operation of the mobile crane 1 of the present embodiment will be described using FIGS. 4 to 6. As shown in FIG. 4, when viewed from the guider standing outside the rough terrain crane 1, the jack 3 which is the first mark and the mark 4 which is the second mark can be seen simultaneously. Therefore, the induction person can easily identify the direction in which the highest performance is exhibited based on the appearance by standing in the overlapping position so that the jack 3 in the front is down and the mark 4 in the back is up. it can. This eliminates the need to repeat the installation work of the crane and the confirmation of the turning direction using the safety device several times. And the performance of the rough terrain crane 1 can be improved compared with the past by matching the direction which exhibits the highest performance with the direction of an actual operation.

  That is, in the performance of the conventional concept, as shown in FIG. 5, the performance is set to the same value in accordance with the lower performance side for the entire circumference (full turning range) of the mobile crane. In other words, since the performance was considered to be the same throughout the entire turning range, it was not necessary to specify the direction in which the highest performance is exhibited. That is, the performance is high in the vicinity of the jack 3 of the outrigger 11 in principle, but the safety side is taken into consideration and the entire turning range is adjusted to the low performance without taking this point into consideration.

  On the other hand, the performance of the new concept, when the boom 14 is positioned in the direction of the jack 3 (11b) of the outrigger 11, in response to the growing demand for higher performance, as shown in FIG. It is proposed to make it higher. In other words, the performance is not identical over the entire turning range, and is controlled to be high near the jack 3 of the outrigger 11. In this case, it is advantageous to specify the direction in which the highest performance is exhibited so that the installation work of the crane and the confirmation of the turning direction using the safety device are not repeated many times. Therefore, according to the present invention, by visually recognizing the mark 2 (3, 4), it is possible to easily identify the direction in which the highest performance is exhibited.

(effect)
Next, the effects of the mobile crane 1 of the present embodiment will be listed and described.

(1) As described above, the rough terrain crane 1 of the present embodiment includes the vehicle body 10, the swivel base 12 rotatably installed on the vehicle body 10, and the boom 14 installed up and down on the swivel base 12 , And an outrigger 11 installed on the vehicle body 10, and a mark 2 (3, 4) for specifying a turning direction capable of exhibiting the highest performance is disposed at a position visible from the appearance And For this reason, the guider who is outside the rough terrain crane 1 can easily identify the turning direction that can exhibit the highest performance from the appearance.

(2) Moreover, since the marks 2 are spaced apart at two places visible at one time from the outside of the rough terrain crane 1, by seeing these two marks 2 (3, 4), It becomes easier to identify the turning direction that exhibits the highest performance more accurately. That is, although it is conceivable to place the mark in one place, in that case, in order to visually recognize the direction from the outside, a considerably large (long) mark is required. On the other hand, by arranging the marks 2 (3, 4) in two places in a dispersed manner, it becomes easy to specify the direction while reducing the size of each one mark 2 (3, 4).

(3) Further, the marks 2 (3, 4) arranged at two places apart from each other are the jack 3 (11 b) of the outrigger 11 which is the first mark and the side surface of the vehicle body 10 which is the second mark. And a mark 4 to be arranged. Therefore, the marks 2 (3, 4) can be easily visually recognized from the outside, and the distance between the marks 3 and 4 can be long. That is, since the jack 3 (11b) of the outrigger 11 which is the first mark is at a position farthest from the vehicle body 10, the distance from the mark 4 of the side surface of the vehicle body 10 which is the second mark may be increased. it can. Then, it becomes easier to identify the direction of achieving the highest performance more accurately.

(4) Similarly, the marks 2 (3, 4) arranged at two places apart from each other are the jack 3 (11 b) of the outrigger 11 which is the first mark and the upper surface of the vehicle body 10 which is the second mark. It is also preferable to include a mark 4 disposed at a predetermined position of. Therefore, the marks 2 (3, 4) can be easily visually recognized from the outside, and the distance between the marks 3 and 4 can be long.

(5) Moreover, it is preferable that the mark 4 is arrange | positioned on planar view and on the straight line which ties the axial center of the jack 3 (11b) of the outrigger 11, and the highest performance position. By arranging the mark 4 in this manner, the direction in which the mark 4 and the jack 3 of the outrigger 11 are connected is the direction in which the highest performance is exhibited.

(6) Further, the mark 4 disposed on the side surface of the vehicle body 10 has a straight line connecting the axial center of the jack 3 (11b) of the outrigger 11 and the turning center O of the turning base 12 in a plan view. It is also preferable to be disposed at a position intersecting with When the center point of performance is the turning center O, if the mark 4 is arranged in this manner, the direction connecting the mark 4 and the jack 3 of the outrigger 11 is the direction in which the highest performance is exhibited.

(7) Further, it is preferable that the marks 4 be disposed at a plurality of positions in accordance with a plurality of projecting widths of the outrigger 11. By configuring in this way, it is possible to exhibit the highest performance not only at the maximum overhang width of the outrigger 11 but also at the middle overhang width.

  Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes to the extent not departing from the scope of the present invention are included in the present invention. included.

  For example, although the example demonstrated the case where the jack 3 and the mark 4 which were arrange | positioned at two places as 2 marks as a mark 2 were spaced apart, it is not limited to this, arrange | positions a mark in three or more places Is also possible.

1: Rough terrain crane (mobile crane);
10: car body; 11: outrigger; 12: swivel base; 14: boom;
2: Mark; 3: Jack; 4: Mark;
O: Center of turning

Claims (7)

A mobile crane comprising: a vehicle body; a swing table rotatably installed on the vehicle body; a boom rotatably installed on the swing table; and an outrigger installed on the vehicle body,
A mobile crane characterized in that a mark for specifying a turning direction capable of exhibiting the highest performance is arranged at a position visible from the appearance.   The mobile crane according to claim 1, wherein the marks are spaced apart from each other at two locations visible at one time from the outside of the mobile crane.   The mark arranged at two places apart is characterized by including a jack of the outrigger which is a first mark, and a mark which is arranged at a side surface of the vehicle body which is a second mark. The mobile crane according to claim 2.   The mark arranged at two places apart includes a jack of the outrigger which is a first mark and a mark which is arranged at a predetermined position of an upper surface of the vehicle body which is a second mark. The mobile crane according to claim 2.   The mobile crane according to claim 3 or 4, wherein the mark is disposed on a straight line connecting the axis of the jack of the outrigger and the highest performance position in plan view.   The mark is disposed at a position where a straight line connecting the axis of the jack of the outrigger and the turning center of the swivel base intersects the side surface of the vehicle body in plan view. Mobile crane listed.   The mobile crane according to any one of claims 3 to 6, wherein the mark is disposed at a plurality of positions in accordance with a plurality of projecting widths of the outrigger.