JP2019043690A - Work vehicle - Google Patents

Abstract

To provide a work vehicle capable of improving the operability of a telescopic boom while reducing cost and weight.SOLUTION: The work vehicle includes a first boom, a second boom positioned closer to a tip end side than the first boom and telescopically inserted in the first boom, a first sheave provided in the vicinity of an end part of the tip end side of the first boom in the length direction, a second sheave provided in the vicinity of an end part of a base end side of the second boom in the length direction, a load hanging wire hooked on the first sheave and the second sheave, and fixing means capable of fixing the first boom and the second boom.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a work vehicle such as a mobile crane and a high-level work vehicle.

  Conventionally, in work vehicles such as a crane truck and a high place work vehicle, a telescopic device having a hydraulic telescopic cylinder is used for telescopic boom expansion and contraction (see, for example, Patent Document 1). More specifically, an extension mechanism using a plurality of extension cylinders, or an extension mechanism combining an extension cylinder and a wire rope for extension and the like has been proposed.

JP, 2016-3103, A

  However, in the telescopic mechanism using the telescopic cylinder, telescopic control of the telescopic cylinder becomes complicated and expensive. Further, the extension mechanism using the extension cylinder has a problem that the weight of the extension cylinder and the hydraulic work device is large.

  Furthermore, the operator also has to operate the hanging load wire not used for the expansion and contraction of the boom at the time of the expansion and contraction operation of the boom, which causes a large amount of operation and easily causes an accident.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a work vehicle capable of improving the operability of the telescopic boom while achieving cost reduction and weight reduction.

  In order to achieve the above object, a work vehicle according to the present invention includes a first boom, and a second boom that is positioned distal to the first boom and is telescopically inserted into the first boom. A first sheave provided in the vicinity of the tip end of the first boom in the longitudinal direction, and a second sheave provided in the vicinity of the proximal end of the second boom in the longitudinal direction It is characterized by comprising a sheave, a load wire hung on the first sheave and the second sheave, and fixing means configured to be able to fix the first boom and the second boom. And

  It is possible to provide a work vehicle capable of improving the operability of the telescopic boom while achieving cost reduction.

It is an example of the side view of the crane concerning this embodiment. An example of the schematic block diagram around the boom of the crane concerning this embodiment is shown. The other example of the schematic block diagram around the boom of the crane concerning this embodiment is shown. The other example of the schematic block diagram around the boom of the crane concerning this embodiment is shown. The other example of the schematic block diagram around the boom of the crane concerning this embodiment is shown. The other example of the schematic block diagram around the boom of the crane concerning this embodiment is shown.

  Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. However, the component described in the following embodiment is an illustration, and it is not a thing of the meaning which limits the technical scope of the present invention only to them.

  As a work vehicle according to the present embodiment, a mobile crane, a high-place work vehicle, a wheel loader, a hydraulic shovel, etc. may be mentioned. Examples of mobile cranes include rough terrain cranes, all terrain cranes, truck cranes, and truck cranes.

  Hereinafter, a rough terrain crane (hereinafter simply referred to as a crane) will be described as an example of a work vehicle according to the present embodiment. Moreover, in the present embodiment, an example in which the boom of the crane is a three-stage boom of a base end side boom, an intermediate boom, and a tip end side boom will be described in the present embodiment. The invention is not limited in this respect, as long as the entire boom can be extended and retracted.

(Schematic configuration of crane)
An example of the side view of the crane which concerns on FIG. 1 at this embodiment is shown. As shown in FIG. 1, the crane 1 according to the present embodiment is 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 rotatably mounted and a boom 100 mounted on a bracket 13 provided upright on the swivel base 12.

  The outrigger 11 can slide out / slide from the vehicle body 10 outward in the width direction by extending or retracting the slide cylinder, and can extend or retract the jack from the vehicle body 10 in the vertical direction by extending or retracting the jack cylinder. It is.

  The swivel base 12 has a pinion gear to which the power of the motor for swiveling is transmitted. The pinion gear is engaged with a circular gear provided on the vehicle body 10 to pivot around the swivel axis. The swivel base 12 has a pilot seat 18 disposed on the front right side, a bracket 13 disposed in the rear center, and a counterweight 19 disposed on the rear lower part.

  The boom 100 is, for example, telescopically configured by the base end side boom 110, the intermediate boom 130, and the tip end side boom 150, and can be expanded and contracted by an expansion and contraction mechanism according to the present embodiment described later. The proximal boom 110, the intermediate boom 130, and the distal boom 150 are generally configured in a telescopic manner in which the proximal boom 110 is disposed at the outermost position and the distal boom 150 is disposed at the innermost position.

  The base end side boom 110 is pivotably attached to a support shaft whose base is horizontally installed on the bracket 13 so that it can be raised and lowered up and down about the support shaft. Furthermore, a relief cylinder 15 is bridged between the bracket 13 and the lower surface of the proximal boom 110, and by extending and retracting the relief cylinder 15, the entire boom 100 can be raised and lowered.

  A rotatable sheave 14 (see FIG. 2) is attached to the tip of the tip side boom 150, and a hanging wire 16 to which a hook block 17 (hereinafter referred to as a hook 17) is attached to the tip of the sheave 14 (Hereinafter referred to as wire 16) is hung. On the other hand, the end of the wire 16 is wound around a winch 160 (see FIG. 2), and by rotating the winch 160, the wire 16 and the hook 17 can be wound up or down. The detailed application of the wire 16 will be described later.

  Moreover, in the rough terrain crane 1 according to the present embodiment, the jib 30 and the tension rods 20, 20 are stored in the sideways holding posture on the side surface of the base end side boom 110. The jib 30 and the tension rods 20, 20 are mounted / stored using a plurality of pins (not shown) and side up cylinders 31.

(First Embodiment: Configuration Example of Telescopic Mechanism of Boom)
Next, an example of the telescopic mechanism of the boom 100 of the crane 1 according to the present embodiment described with reference to FIG. 1 will be described with reference to FIG.

  In FIG. 2, an example of the schematic block diagram around the boom of the crane which concerns on this embodiment is shown. As described above with reference to FIG. 1, the crane 1 according to the present embodiment includes, for example, the proximal boom 110, the intermediate boom 130 telescopically inserted into the proximal boom 110, and the intermediate boom 130. And a three-stage boom of a tip end boom 150 telescopically inserted.

  A first sheave 112 is provided in the vicinity of the end on the distal end side in the longitudinal direction of the proximal boom 110. In addition, a second sheave 132 is provided near the proximal end of the intermediate boom 130 in the lengthwise direction, and a third sheave 134 is provided near the distal end of the middle boom 130 in the lengthwise direction. ing. Furthermore, a fourth sheave 152 is provided at the end of the proximal end in the longitudinal direction of the distal side sheave 150.

  An example in which the wire 16 is hung on the crane 1 configured as described above will be described. The wire 16 is fed out of the winch 160 and hooked in order of the first sheave 112, the second sheave 132, the third sheave 134, the fourth sheave 152, and the sheave 14, and the hook 17 is connected to the tip of the wire 16.

  Moreover, the crane 1 which concerns on this embodiment is provided with the fixing means for fixing adjacent booms according to expansion-contraction of a boom. Specifically, the crane 1 is configured to be able to fix a first fixing means configured to be able to fix the proximal end side boom 110 and the intermediate boom 130, and the intermediate boom 130 and the distal end side boom 150. A second fixing means is provided.

  Specific examples of the first fixing means and the second fixing means include, but not limited to, a method using a connecting pin and a pin hole for receiving the connecting pin. In this case, for example, one or more pin holes 136 are provided in the longitudinal direction of the intermediate boom 130, and a connecting pin driving device (not shown) is provided on the proximal boom 110 located outside the intermediate boom 130. Further, one or more pin holes 156 are provided in the longitudinal direction of the distal end side boom 150, and a connecting pin driving device (not shown) is provided to the intermediate boom 130 located outside the distal end side boom 150.

First Embodiment: Method of Telescopicizing Boom
Next, the method of retracting the boom of the claim according to the present embodiment described with reference to FIG. 2 will be described with reference to FIGS. 3 to 5.

  In the stored state shown in FIG. 2, connection pins (not shown) are inserted into the pin holes 136 a of the intermediate boom 130 and the pin holes 156 a of the distal end side boom 150.

  First, the hook 17 is pressed against the boom head 40 by rolling up the winch 160. Then, the intermediate boom 130 is extended by removing the connecting pin inserted in the boom to be extended, in this case, the pin hole 136a of the intermediate boom 130, and rolling up the winch 160.

  After the intermediate boom 130 is extended to a predetermined length, a connection pin is inserted into the pin hole 136 d of the intermediate boom 130 to fix the intermediate boom 130 (see FIG. 3).

  Next, the connecting pin inserted in the boom to be extended, in this case, the pin hole 156a of the distal end boom 150 is removed, and the winch 160 is wound up to extend the distal end boom 150.

  After the distal end side boom 150 is extended to a predetermined length, a connecting pin is inserted into the pin hole 156 d of the distal end side boom 150 to fix the distal end side boom 150 (see FIG. 5).

  After the intermediate boom 130 and the distal end boom 150 are extended to a predetermined length by the above-described method, the hook 17 is lowered by lowering the winch 160 to start crane work.

  In the present embodiment, the intermediate boom 130 is extended from the stored state of the boom 100 shown in FIG. 2, and then the distal end side boom 150 is extended to fully extend the boom 100. The invention is not limited in this respect, as shown in FIG. 2 from the state shown in FIG. 4, firstly the distal end side boom 150 is extended and then the intermediate boom 130 is extended, as shown in FIG. The boom 100 may be fully extended.

  Moreover, when reducing a boom after completion of crane work, the hook 17 is first pressed against the boom head 40 by winding up the winch 160.

  Next, the connecting pin of a predetermined boom, for example, the pin hole 156 d of the distal end boom 150 is removed, and the winch 160 is lowered. Thereby, the front end side boom 150 is reduced by the weight of the front end side boom 150.

  After the distal end side boom 150 is contracted, the connection pin is inserted into the pin hole 156 a of the distal end side boom 150.

  Next, the connection pin of the pin hole 136d of the intermediate boom 130 is removed, and the winch is lowered. Thus, the intermediate boom 130 is reduced by the weight of the intermediate boom 130 and the distal end side boom 150.

  After the intermediate boom 130 is reduced, the connection pin is inserted into the pin hole 136a of the intermediate boom 130, and the full contraction of the boom 100 is completed.

  In the present embodiment, a method is described in which the distal end side boom 150 is reduced from the fully extended state of the boom 100, and then the intermediate boom 130 is reduced and the boom 100 is fully compressed. The configuration is not limited in point, and the intermediate boom 130 may be reduced and then the tip boom 150 may be reduced.

  The change of the length of the wire 16 and the insertion and removal of the connection pin are carried out manually by the operator using, for example, an operation interface (for example, an operation lever, an operation switch, an operation button) provided on the operator seat 18 or a remote control device Alternatively, the control may be performed automatically using a control device.

  By using the boom telescopic mechanism and the boom telescopic method according to the present embodiment, the connecting pin, the pipe for driving the connecting pin and the sheave are added, but the hydraulic telescopic cylinder and hydraulic operating device related to the telescopic movement of the boom Since it becomes unnecessary, weight reduction and cost reduction of the whole crane are achieved.

  Moreover, in the boom expansion and contraction method using the conventional expansion cylinder and hydraulic actuation device, it is also necessary to operate the suspension load wire not used for the expansion and contraction of the boom, and there is a problem that the operation amount is large and it is likely to lead to an accident. . However, in the boom telescopic mechanism and the boom telescopic method according to the present embodiment, the boom is made to expand and contract by alternately performing the operation of the hanging load wire and the operation of the boom connection pin, so simultaneous operation is unnecessary and the amount of operation is small. . Therefore, it also has the feature that it leads to accident reduction.

Second Embodiment Example of Configuration of Telescopic Mechanism of Boom
Next, with reference to FIG. 6, the other example of the expansion-contraction mechanism of the boom 100 of the crane 1 which concerns on this embodiment is demonstrated.

  In FIG. 6, the other example of the schematic block diagram around the boom of the crane which concerns on this embodiment is shown. As described above with reference to FIG. 1, the crane 1 according to the present embodiment includes, for example, the proximal boom 110, the intermediate boom 130 telescopically inserted into the proximal boom 110, and the intermediate boom 130. And a three-stage boom of a tip end boom 150 telescopically inserted.

  A fifth sheave 212 is provided in the vicinity of the end on the distal end side in the longitudinal direction of the proximal boom 110. A sixth sheave 232 is provided in the vicinity of the proximal end of the intermediate boom 130 in the longitudinal direction. A seventh sheave 240 is provided at a position facing the sheave 14 of the boom head 40.

  An example in which the wire 16 is hung on the crane 1 configured as described above will be described. The wire 16 is fed out of the winch 160 and hooked in order of the fifth sheave 212, the sixth sheave 232, the seventh sheave 240, and the sheave 14, and the hook 17 is connected to the tip of the wire 16.

  Further, an eighth sheave 242 is provided in the vicinity of the end on the tip side in the longitudinal direction of the intermediate boom 130, and a wire rope 244 (hereinafter referred to as an extension wire 244) for boom extension is a base. The distal end of the end boom 110 is hooked to the proximal end of the distal boom 150 through the eighth sheave 242.

  Moreover, also in the crane 1 which concerns on this embodiment, the 1st fixing means comprised so that fixation of the base end side boom 110 and the intermediate boom 130 was possible is provided. A specific example of the first fixing means is not particularly limited, but similar to the first embodiment, a connecting pin (not shown) and a pin hole for receiving the connecting pin (only the pin hole 136d is shown in FIG. 6) And the method of utilizing.

Second Embodiment: Method of Telescopicizing Boom
Next, a method of retracting a boom according to the second embodiment will be described.

  In the stored state of the crane of the second embodiment, a connecting pin (not shown) is inserted into the pin hole 136a of the intermediate boom 130.

  First, the hook 17 is pressed against the boom head 40 by rolling up the winch 160. Then, the connection pin of the pin hole 136a of the intermediate boom 130 is removed, the winch 160 is wound up, and the boom 100 is extended.

  In the present embodiment, by applying tension to the extension wire 244, both the intermediate boom 130 and the distal boom 150 are simultaneously extended.

  After the entire boom 100 is extended to a predetermined length, the connection pin is inserted into the pin hole of the intermediate boom 130, for example, the pin hole 136d, and the hook 17 is lowered by lowering the winch 160 to start crane work. .

  Moreover, when reducing a boom after completion of crane work, the hook 17 is first pressed against the boom head 40 by winding up the winch 160.

  Next, when the connecting pin of the pin hole 136 d of the intermediate boom 130 is removed and the winch 160 is lowered, the intermediate boom 130 and the distal end boom 150 are contracted by the weight of the boom 100. In this case, the tension of the extension wire 244 disappears.

  After the boom 100 is fully contracted, the connection pin is inserted into the pin hole 136 a of the intermediate boom 130.

  By using the boom telescopic mechanism and the boom telescopic method according to the second embodiment, the connecting pin of the distal end side boom 150, the piping for driving the connecting pin, and the sheave become unnecessary compared to the first embodiment. Therefore, the cost can be further reduced.

  Further, also in the boom telescopic mechanism and the boom telescopic method according to the second embodiment, the boom is expanded and contracted by alternately performing the operation of the hanging load wire and the operation of the boom connection pin, so simultaneous operation is unnecessary and the operation amount Less is. Therefore, it also has the feature that it leads to accident reduction. Therefore, it also has the feature that it leads to accident reduction.

1: Rough terrain cranes;
10: vehicle body 11: outrigger 12: swivel base 14: sheave 15: relief cylinder 16: wire 17: hook 20: tension rod 30: jib 31: side up cylinder 40: boom head 100: boom 110: proximal boom 112: First sheave 130: middle boom 132: second sheave 134: third sheave 136: pin hole 150: tip boom 152: fourth sheave 154: sheave 156: pin hole 160: winch 212: fifth Sheave 232: sixth sheave 240: seventh sheave 242: eighth sheave 244: extension wire

Claims (4)

吊 Use hanging wire as extension wire (A high-level claim that includes both the configurations of Attachment 1 and Attachment 2 at the time of meeting, and does not limit the number of booms)
With the first boom,
A second boom which is located on the tip end side of the first boom and telescopically inserted in the first boom;
A first sheave provided in the vicinity of a tip end of the first boom in the lengthwise direction;
A second sheave provided near the proximal end of the second boom in the longitudinal direction;
A load wire hung on the first sheave and the second sheave;
Fixing means configured to be able to fix the first boom and the second boom;
Work vehicle equipped with ⇒ Fixing means to connecting pin The fixing means has a pin hole provided one or more in the longitudinal direction of the second boom, and a connecting pin that can be inserted into and removed from the pin hole.
The work vehicle according to claim 1. 具体 Specific configuration of Attachment 1 at the time of meeting
An intermediate boom telescopically inserted into the proximal boom;
A tip end boom telescopically inserted into the middle boom;
A first sheave provided in the vicinity of a distal end of the proximal boom in the longitudinal direction;
A second sheave provided near the proximal end of the intermediate boom in the longitudinal direction;
A third sheave provided near the end on the tip side in the longitudinal direction of the intermediate boom;
A fourth sheave provided at a proximal end of the distal boom in the lengthwise direction;
A hanging wire hung on the first sheave, the second sheave, the third sheave, and the fourth sheave;
First fixing means configured to be able to fix the proximal boom and the intermediate boom;
Second fixing means configured to be able to fix the intermediate boom and the distal end side boom;
Work vehicle equipped with 具体 Specific configuration of Attachment 2 at the time of meeting
An intermediate boom telescopically inserted into the proximal boom;
A tip end boom telescopically inserted into the middle boom;
A first sheave provided in the vicinity of a distal end of the proximal boom in the longitudinal direction;
A second sheave provided near the proximal end of the intermediate boom in the longitudinal direction;
A third sheave provided near the end on the tip side in the longitudinal direction of the intermediate boom;
A load wire hung on the first sheave and the second sheave;
A boom extension wire hooked to the proximal boom, the third sheave, and the distal boom;
First fixing means configured to be able to fix the proximal boom and the intermediate boom;
Work vehicle equipped with