JP4019841B2 - Crawler crane - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a crawler crane. More specifically, the present invention is equivalent to a crawler crane using an upper swing body having a boom support bracket dedicated to the crane, despite using a traveling carriage for an excavator and an upper swing body. The present invention relates to a crawler crane that makes it possible to obtain a lifting capacity of.
[0002]
[Prior art]
  It is known that there are two types of crawler cranes equipped with a multi-stage telescopic crane boom. One of the forms is that a crane-equipped upper swing body having a boom support bracket for supporting the crane boom is mounted on a traveling carriage, and the other form is a traveling carriage and an upper swing body for a hydraulic excavator. And are to be utilized. As the latter crawler crane, for example, one disclosed in Japanese Utility Model Laid-Open No. 56-64460 is known. Hereinafter, an outline of the crawler crane according to this conventional example, a partial cross-sectional view of the upper revolving structure, a diagram of a main part configuration explanatory diagram3Will be described with reference to FIG.
[0003]
  Figure3Reference numeral 51 denotes a boom support bracket of an upper swing body for a hydraulic excavator.
  A boom boom pin 52 that supports the boom of the excavator of the boom support bracket 51 and a cylinder connecting pin 53 that supports the boom cylinder of the excavator are fixed to a crane boom pivot bracket 54 described later. The crane boom pivot bracket 54 is formed in a U-shape, and a crane boom (multistage telescopic boom) 55 is supported on the rear end portion of the crane boom pivot bracket 54 via a boom foot pin 56. Yes. And this crane boom 55 is comprised so that it may be raised / lowered by the raising / lowering cylinder 57 by which the bottom side is supported by the said cylinder connection pin 53. As shown in FIG. The boom foot pin 52 that supports the boom of the hydraulic excavator is positioned forward from the turning center of the crawler crane, and the boom foot pin 56 that supports the crane boom 55 is positioned rearward from the turning center of the crawler crane.
[0004]
  According to the crawler crane according to this conventional example, the boom foot pin 56 that supports the crane boom 55 is connected to the boom support bracket 54 by the crane boom pivot bracket 54, even though the upper swing body for the hydraulic excavator is used. It is supported by a boom foot pin 56 behind the turning center 51. Accordingly, the center of gravity of the crawler crane body moves to the rear side, so that the stability of the vehicle body during the crane operation is improved, and the vehicle body stability close to that when using an upper swing body having a crane-specific boom support bracket is obtained. .
[0005]
[Problems to be solved by the invention]
  According to the crawler crane according to the above-described conventional example using the traveling carriage for the excavator and the upper swing body, the vehicle body stability close to that when the upper swing body having a boom support bracket dedicated to the crane is used can be obtained. Therefore, it is considered excellent and useful.
  And since the hydraulic excavator is more mass-produced and has a mass production effect compared to the crawler crane, the crawler crane using the traveling cart for the excavator and the upper rotating body is inexpensive in cost. There is an advantage that it is economical.
[0006]
  However, a side view of the crawler crane4As shown in FIG. 2, a winch 58 that winds up and rewinds a rope 59 that lifts and lowers a hook 55 a suspended from the tip of the crane boom 55 is attached to the rear end of the crane boom 55. In the crawler crane 50, since the rear end of the winch 58 needs to be stored within the rear turning radius of the upper swing body 50a, the base end portion of the crane boom 55 must be moved forward by at least the winch 58 minutes. . Therefore, the position of the base end portion of the boom is forward, and a longer boom cannot be mounted. In addition, since the center of gravity of the vehicle body is forward, compared to the case of a crawler crane using an upper swing body having a boom support bracket dedicated to the crane, there is a problem that the lifting capacity of a suspended load in crane work is inferior.
[0007]
  Therefore, the object of the present invention is to secure a lifting capacity equivalent to that of a crawler crane using an upper swing body having a boom support bracket for a crane, despite using a traveling carriage for an excavator and an upper swing body. It is to provide a crawler crane that can.
[0008]
[Means for Solving the Problems]
  The present invention has been made in view of the above circumstances, and therefore, in order to solve the above-mentioned problems, the means employed by the crawler crane according to claim 1 of the present invention is a traveling with a crawler type traveling device. An upper revolving unit is mounted on the carriage so as to be pivotable about a vertical axis, and a bracket-like adapter is fixed to a boom support bracket to which a boom of a hydraulic excavator of this upper revolving unit is pivotally attached via a fixing pin. In the crawler crane in which a multi-stage telescopic crane boom is supported by the bracket-shaped adapter via a boom foot pin so as to be raised and lowered, an engine is mounted on the rear part of the upper swing body, and the adapter is connected to the engine. The crane boom is supported above and at the rear end position of the upper swing body, and hydraulic oil is supplied to and discharged from the telescopic cylinder that expands and contracts the crane boom. Hydraulic hose winding, hose reel unwinding, Said en In front of the gin, andBelow the crane boom in the traveling positionNear the front end of the boom support bracketIt is characterized by being supported at a position.
[0009]
  The means adopted by the crawler crane according to claim 2 of the present invention is the crawler crane according to claim 1, wherein the base end surface of the crane boom supported by the adapter via a boom foot pin is the upper swivel. It is located above the rear end surface of the counterweight that forms the rear end of the body.
[0010]
  According to the crawler crane of the first aspect, the bracket-like adapter is fixed to the boom support bracket to which the boom of the excavator of the upper swing body is pivotally attached via the fixing pin, and the boom foot pin is attached to the bracket-like adapter. An engine is mounted on the rear part of the upper revolving unit of a crawler crane in which a multi-stage telescopic crane boom is supported up and down through the adapter, and the adapter is located above the engine and at the rear end position of the upper revolving unit A hose reel that winds and unwinds a hydraulic hose that feeds and discharges hydraulic oil to an extendable cylinder that supports the crane boom and expands and contracts the crane boom.In front of the engine, andBelow the crane boom in the traveling positionNear the front end of the boom support bracketSupport in positiondo itYes.
  In the crawler crane according to the second aspect, the base end surface of the crane boom supported by the adapter via the boom foot pin is located above the rear end surface of the counterweight forming the rear end portion of the upper swing body. positioned.
  Therefore, according to the crawler crane of the configuration according to claim 1 or 2 of the present invention, a longer boom can be mounted, and the center of gravity of the boom is further to the rear of the upper swing body, and the center of gravity of the crawler crane body is The lifting ability can be improved because it is further rearward.
  Also,In front of the engine andBelow the crane boom in the traveling positionNear the front end of the boom support bracketSince the hose reel is supported at the position and it is not necessary to attach the hose reel to the lower side near the base end of the crane boom, the support position of the crane boom can be lowered, the center of gravity of the crawler crane body is lowered, and the crane The stability of the crawler crane main body during work can be improved. Furthermore, the overall height of the crawler crane body can be reduced.
[0011]
  The means adopted by the crawler crane according to claim 3 of the present invention is the crawler crane according to any one of claims 1 and 2, wherein the rear end portion of the adapter is supported by the counterweight. It is characterized by.
  According to the crawler crane according to the third aspect, the rear end portion of the adapter is supported by the counterweight. Therefore, the adapter can be made lighter than when cantilevered and the center of gravity of the crawler crane is lowered, which can contribute to the improvement of the stability of the crawler crane.
[0012]
  The means adopted by the crawler crane according to claim 4 of the present invention is the crawler crane according to any one of claims 1 to 3, wherein the bottom of the lifting cylinder that causes the adapter to lift the crane boom. A lifting cylinder connecting pin that supports the side is supported.
  In the crawler crane according to the fourth aspect, the lifting cylinder connecting pin that supports the bottom side of the lifting cylinder for lifting the crane boom is supported by the adapter. Therefore, the lifting cylinder can be assembled in advance in the adapter, and the hydraulic excavator can be quickly changed from the crawler crane to the crawler crane, and conversely, the crawler crane can be quickly changed to the hydraulic excavator.
[0013]
  The means employed by the crawler crane according to claim 5 of the present invention is as follows.1In the crawler crane according to any one of 1 to 4, a winch that winds and rewinds a rope that lifts and lowers a hook that is suspended from a tip of the crane boom is provided on one side surface of the rear portion of the adapter. It is characterized by being arranged.
  According to the crawler crane of the fifth aspect, since the winch that winds and rewinds the rope that lifts and lowers the hook suspended from the tip of the crane boom is disposed on one side surface of the rear portion of the adapter, the crane boom The base end can be positioned further rearward, and the stability of the vehicle body during crane work can be improved.
[0014]
  The means employed by the crawler crane according to claim 6 of the present invention is as follows.1In the crawler crane according to any one of Items 5 to 5, a weight balance weight in consideration of an offset amount of the crane boom is disposed on the other side surface of the rear portion of the adapter. .
  In the crawler crane according to the sixth aspect, the balance weight of the weight considering the offset amount of the crane boom is disposed on the other side surface of the rear portion of the adapter. Therefore, the left and right weight balance of the crawler crane is improved, which can contribute to the improvement of the stability of the crawler crane body during crane operation. Furthermore, the crane capacity can be further improved.
[0015]
  The means adopted by the crawler crane according to claim 7 of the present invention is the crawler crane according to any one of claims 1 to 6, wherein a rear end radius of the upper swing body is the rear of the traveling carriage. It is configured so as not to protrude from the end.
  According to the crawler crane according to the seventh aspect, since the upper swing body does not protrude rearward, the upper end of the upper swing body does not interfere with surrounding objects, and the overturning fulcrum of the vehicle body is movable. It becomes possible to ensure the required stability, which is a legally required condition for a crane, so that it is safe to operate the crane.allCan be improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
  A crawler crane according to Embodiment 1 of the present invention will be described with reference to the accompanying drawings.
  Fig.1 (a) is a partial cross section side view of a crawler crane, and FIG.1 (b) is a top view of a crawler crane.
[0017]
  Reference numeral 1 shown in FIG. 1A is a crawler crane according to the first embodiment. The crawler crane 1 includes a traveling carriage 2 having a pair of crawler type traveling devices 2a, and an upper turning body 4 is mounted on the traveling carriage 2 via a turning bearing 3 so as to be rotatable around a vertical line. ing. The upper swing body 4 includes a boom support bracket 5 for a hydraulic excavator, and an operator cab 4 a is mounted on one side of the boom support bracket 5. An engine 6 is mounted sideways in an engine room 4b provided behind the turning center CL of the upper turning body 4 (on the right side in FIG. 1A), and the rear part of the engine room 4b. A counterweight 4c is attached to the side surface.
[0018]
  The boom support bracket 5 is fitted with a cylinder connection pin hole 5a into which a cylinder connection pin for connecting the bottom side of the boom cylinder of the excavator is fitted, and a boom foot pin for connecting the base end portion of the boom of the excavator. A boom foot pin hole 5b to be joined is provided. The cylinder connecting pin hole 5a is provided at a lower position on the front side (the left side in FIG. 1A) than the turning center CL of the upper turning body 2. The boom foot pin hole 5b is provided slightly ahead of the turning center CL of the upper turning body 2 and at a higher position than the boom bottom pin hole 5a. A pin P is inserted into the cylinder connecting pin hole 5a of the boom support bracket 5.₁However, the pin P is inserted into the boom foot pin hole 5b.₂Is attached to a bracket-shaped adapter (corresponding to a crane boom pivot bracket of a crawler crane according to a conventional example) having a bracket-like shape, which will be described later.
[0019]
  The adapter 7 has the pin P₁, P₂Is provided, and extends backward from the turning center CL of the upper turning body 4 so as to cover the engine room 4b. A boom foot pin P disposed at the rear end of the adapter 7 and at the same height as the upper end of the cab 4a.₃A multi-stage telescopic crane boom 8 is supported via a lift.
  The base end surface of the crane boom 8 is located above the rear end surface of the counterweight 4 c that forms the rear end portion of the upper swing body 4. And this crane boom 8 is a lifting cylinder connecting pin P₄The bottom side is configured to be lifted by the rod extending and retracting the lifting cylinder 9 connected to the adapter 7.
[0020]
  A reel mounting bracket 7a protrudes obliquely upward and forward in the lower part of the front side of the adapter 7 and in the vicinity of the cylinder connecting pin hole 5a, and the crane boom 8 is attached to the reel mounting bracket 7a. A hose reel 11 for winding and rewinding a hose (not shown) that feeds and discharges hydraulic oil to and from a boom extension cylinder (not shown) that extends and retracts is supported. As is well understood from FIG. 1 (a), the hose reel 11 is disposed so as to be positioned below the crane boom 8 in a traveling posture in which the crane boom 8 is completely laid down. While the hose reel 11 is disposed at the front position, not only the interference with other devices is prevented, but also when the hose is wound and unwound, it is considered that a load is not easily applied to the hose.
[0021]
  A rope (not shown) that lifts and lowers a hook 8a that hangs from the tip of the crane boom 8 on the one side surface of the rear portion of the adapter 7, that is, the right side surface when the crawler crane 1 is viewed from the rear side. A winch 10 for winding and rewinding is mounted. Further, a balance weight 12 having a weight in consideration of an offset amount in the width direction from the turning center CL of the upper swing body 4 of the crane boom 8 is mounted on the left side surface of the rear portion of the adapter 7.
[0022]
  Hereinafter, the operation mode of the crawler crane 1 according to the first embodiment will be described. That is, the winch 10 is mounted on one side surface of the rear portion of the adapter 7, and the base end surface of the crane boom 8 is positioned above the rear end surface of the counterweight 4c that forms the rear end portion of the upper swing body 4. Boom foot pin P at the rear of the adapter 7₃It is connected through a via. That is, the boom foot pin P at the rear of the adapter 7₃The support position is equivalent to the boom foot pin support position by the boom support bracket of the upper swing body dedicated to the crane.
[0023]
  Accordingly, a longer boom 8 can be mounted, and the center of gravity of the boom 8 is further rearward of the upper swing body 4 and the center of gravity of the crawler crane body is further rearward. Therefore, according to the crawler crane 1 which concerns on this Embodiment 1, stability equivalent to the case of the crawler crane which attached the crane boom to the upper turning body only for cranes can be acquired in crane work, A lifting ability equivalent to that of a crawler crane using an upper turning body can be exhibited.
[0024]
  Moreover, according to the crawler crane 1 which concerns on this Embodiment 1, the following various effects can be acquired. That is, in addition to the crane boom 8, a lifting cylinder 9, a winch 10, a hose reel 11, and a balance weight 12 are attached to the adapter 7. Therefore, since it can be assembled in advance as an assembly, it can be easily changed from a hydraulic excavator to a crawler crane, and conversely from a crawler crane to a hydraulic excavator. Further, the hose reel 11 is attached to the adapter 7 so as to be positioned below the crane boom 8 in a traveling posture in which the crane boom 8 is completely laid down. Therefore, it is not necessary to attach the hose reel 11 to the lower surface of the base end portion of the crane boom 8, and the crane boom 8 can be lowered. Therefore, the center of gravity of the boom is lowered, contributing to the improvement of the vehicle stability of the crawler crane 1. can do. In addition, the boom hoisting fulcrum is arranged in the vicinity of the upper end of the adapter 7 on the upper surface side of the boom 8 and at a high position that is substantially the same height as the upper end of the cab 4a and is the maximum height of the vehicle body. The total height during transportation can be lowered while ensuring the maximum head.
[0025]
  Also, a weight balance weight 12 in consideration of the offset amount of the crane boom 8 is disposed on the side of the adapter 7 at the rear side opposite to the winch 10, and the weight balance in the width direction of the upper swing body 4 of the crawler crane 1 is provided. Since it is improved, it can contribute to the further improvement of the vehicle body stability in crane work. The crane boom 8 is offset in the width direction of the upper swing body 4 because the crawler crane 1 is small. That is, just because the crawler crane 1 is small, the cab cannot be made small, and a cab of the same size must be mounted regardless of whether it is small or large.
[0026]
  A crawler crane according to a second embodiment of the present invention will be described with reference to the accompanying drawings.
  However, the difference between the second embodiment and the first embodiment resides in that the rear end portion of the adapter is supported by a counterweight, so the difference will be mainly described. FIG. 2 is a partial cross-sectional side view of the crawler crane according to the second embodiment, in which the same reference numerals are given to the same components as those in the first embodiment and the components having the same functions.
[0027]
  A boss portion is provided so as to protrude from the side surface of the adapter 7, and a notch portion is provided in the counterweight 4c. A front-view H-shaped connecting member is fitted to the boss part and the notch part, and each is fixed by a pin. The counterweight 4c at the rear end and the adapter 7 for supporting the boom are connected to each other at the rear end via a connecting member. More specifically, the upper side of the adapter rear support member 13 is connected to the lower rear part of the adapter 7 and the upper adapter fixing pin P.₅It is connected by. Also, the lower side of the adapter rear support member 13 is the lower adapter fixing pin P.₆To the counterweight 4c. And the adapter 7 of the crawler crane 1 which concerns on this Embodiment 2 is pin P similarly to the case of the adapter of the crawler crane which concerns on the said Embodiment 1.₁, P₂Is attached to a boom support bracket 5 for a hydraulic excavator. Since the rear end of the adapter 7 is supported, the front side support of the adapter 7 is a pin P in consideration of assembly.₁Or pin P₂It is also possible to make it only.
[0028]
  The crawler crane 1 according to the second embodiment is completely the same as the first embodiment except that the rear end portion of the adapter 7 is supported by the adapter rear support member 13. is there. Therefore, according to the crawler crane 1 which concerns on this Embodiment 2, the effect equivalent to the crawler crane which concerns on the said Embodiment 1 can be acquired. Furthermore, according to the crawler crane 1 according to the second embodiment, in addition to this effect, the strength of the adapter 7 can be reduced. Therefore, the weight of the adapter 7 can be reduced, and the center of gravity of the crawler crane 1 can be lowered, which can further contribute to the improvement of the vehicle body stability of the crawler crane 1 in crane work.
[0029]
【The invention's effect】
  As described above, according to the crawler crane according to claim 1 or 2 of the present invention, the bracket-shaped adapter is fixed to the boom support bracket to which the boom of the excavator of the upper swing body is pivotally attached via the fixing pin. An engine is mounted on the rear part of the upper rotating body of the crawler crane in which a multi-stage telescopic crane boom is supported by the bracket-shaped adapter via a boom foot pin. A hose reel that winds up and rewinds a hydraulic hose that supports the crane boom at the rear end position of the upper revolving unit and that feeds and discharges hydraulic oil to an extension cylinder that expands and contracts the crane boom.In front of the engine, andBelow the crane boom in the traveling positionNear the front end of the boom support bracketSupport in positiondo itYes. In the crawler crane according to the second aspect, the base end surface of the crane boom supported by the adapter via the boom foot pin is located above the rear end surface of the counterweight forming the rear end portion of the upper swing body. positioned. Accordingly, a longer boom can be mounted, and the center of gravity of the boom is further to the rear of the upper swing body, and the center of gravity of the crawler crane body is further to the rear. Can achieve the same stability as a crawler crane with a crane boom mounted on the upper swing body dedicated to the crane, and exhibit the same lifting capacity as a crawler crane using the upper swing body dedicated to the crane. it can. In addition, the hose reel is supported at the front of the upper swing body, and it is not necessary to attach the hose reel to the lower side near the base end of the crane boom. This can contribute to the stability of the vehicle body. Further, since the overall height of the vehicle body can be reduced, the transportability is improved.
[0030]
  According to the crawler crane according to claim 3 of the present invention, the rear end portion of the adapter is supported by the counterweight. Therefore, the adapter can be made lighter than when cantilevered and the center of gravity of the crawler crane is lowered, which can contribute to the improvement of the stability of the crawler crane.
[0031]
  According to the crawler crane according to claim 4 of the present invention, the elevating cylinder connecting pin that supports the bottom side of the elevating cylinder that elevates the crane boom is supported by the adapter.
  Therefore, the lifting cylinder can be assembled in advance in the adapter, and the hydraulic excavator can be quickly changed from the crawler crane to the crawler crane, and conversely, the crawler crane can be quickly changed to the hydraulic excavator.
[0032]
  According to the crawler crane according to claim 5 of the present invention, the winch that winds and rewinds the rope that lifts and lowers the hook that is suspended from the tip of the crane boom is disposed on one side surface of the rear portion of the adapter. Therefore, the crane boom base end can be positioned more rearward, and the stability of the vehicle body during crane work can be improved.
[0033]
  According to the crawler crane according to claim 6 of the present invention, the balance weight of the weight in consideration of the offset amount of the crane boom is disposed on the other side surface of the adapter rear portion on the side opposite to the winch. Therefore, since the weight balance in the width direction of the upper swing body of the crawler crane is improved, it is possible to contribute to the improvement of the vehicle body stability of the crawler crane in crane work. Furthermore, the crane capacity can be improved.
[0034]
  According to the crawler crane according to claim 7 of the present invention, since the upper swing body does not protrude rearward, the end portion of the upper swing body does not interfere with the surroundings when the upper swing body turns, and the vehicle body overturning fulcrum However, it becomes possible to almost ensure the predetermined stability that is a legally required condition as a mobile crane, and the safety during crane operation can be improved.
[Brief description of the drawings]
FIG. 1 is a side view showing a partial cross section of a crawler crane according to Embodiment 1 of the present invention, and FIG. 1 (b) is a plan view of the crawler crane.
FIG. 2 is a partial cross-sectional side view of a crawler crane according to a second embodiment, in which the same components as those in the first embodiment and components having the same functions are denoted by the same reference numerals.
[Figure3It is a partial sectional view main part configuration explanatory view of the upper swing body of the crawler crane according to the conventional example.
[Figure4A side view of a crawler crane according to a conventional example.
[Explanation of symbols]
  DESCRIPTION OF SYMBOLS 1 ... Crawler crane, 2 ... Traveling trolley, 2a ... Traveling apparatus, 3 ... Slewing bearing, 4 ... Upper turning body, 4a ... Driver's cab, 4b ... Engine room, 4c ... Counterweight, 5 ... Boom support bracket, 5a ... Cylinder Connecting pin hole, 5b ... Boom foot pin hole, 6 ... Engine, 7 ... Adapter, 7a ... Reel mounting bracket, 8 ... Crane boom, 8a ... Hook, 9 ... Lifting cylinder, 10 ... Winch, 11 ... Hose reel, 12 ... Balance weight, 13 ... Adapter rear support member, 14 ... Upper support bracket, 15 ... Lower support bracket, CL ... Turning center, P₁, P₂... Pin, P₃... Boom foot pin, P₄... Cylinder connecting pin, P₅... Upper adapter fixing pin, P₆... Lower adapter fixing pin, P₇... Adapter fixing pin.

Claims (7)

An upper swinging body is mounted on a traveling carriage equipped with a crawler type traveling device so as to be pivotable about a vertical axis, and a fixing pin is attached to a boom support bracket to which a boom of a hydraulic excavator of this upper swinging body is pivotally attached. In a crawler crane in which a bracket-type adapter is fixed to the bracket-like adapter, and a multistage telescopic crane boom is supported by the bracket-like adapter via a boom foot pin so that it can be raised and lowered. The adapter supports the crane boom above the engine and at the rear end position of the upper swing body, and winds up and rewinds a hydraulic hose that feeds and discharges hydraulic oil to an extendable cylinder that expands and contracts the crane boom. a hose reel, the boom support bracket front end of the lower crane boom which is in front of the engine, and the traveling position Crawler crane, characterized in that the supporting beside position.   The base end surface of a crane boom supported by the adapter via a boom foot pin is located above a rear end surface of a counterweight that forms a rear end portion of the upper swing body. The crawler crane of 1.   The crawler crane according to claim 1, wherein a rear end portion of the adapter is supported by the counterweight.   The crawler crane according to any one of claims 1 to 3, wherein an elevating cylinder connecting pin that supports a bottom side of an elevating cylinder that elevates the crane boom is supported by the adapter. .   The winch which winds up and rewinds the rope which raises / lowers the hook suspended from the tip of the crane boom is disposed on one side surface of the rear part of the adapter. The crawler crane as described in any one of the items.   The crawler according to any one of claims 1 to 5, wherein a balance weight having a weight in consideration of an offset amount of a crane boom is disposed on the other side surface of the rear portion of the adapter. crane.   The crawler crane according to any one of claims 1 to 6, wherein a rear end radius of the upper swing body is configured not to protrude from a rear end of the traveling carriage.

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