JP2009051640A - Counterweight with hydraulic fluid tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a walking crane for further reducing the total weight of a vehicle. <P>SOLUTION: A hydraulic fluid quantity in a hydraulic fluid tank of the walking crane having the hydraulic fluid tank on a swivel base, is secured only by an oil quantity required for attaching-detaching at least a counterweight by a counterweight attaching-detaching means. A second hydraulic fluid tank is provided in the counterweight capable of detachably disassembling and carrying separately from the hydraulic fluid tank. When installing the counterweight, both hydraulic fluid tanks are communicated, and the total weight of the vehicle is further reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a counterweight with a hydraulic oil tank applied to a detachable counterweight of a work machine such as a mobile crane.

The counterweight of a conventional mobile crane is a counterweight of a non-removable mobile crane. The counterweight is a tank that also serves as a counterweight, and a counterweight function is provided by putting liquid such as oil or water into the counterweight tank. (Patent Document 1). Further, there is a counterweight (Patent Document 2) in which a counterweight is fixed to a swivel or a structure in which a hydraulic cylinder for raising and lowering the counterweight is installed and which is detachable at the rear of the swivel.
Japanese Utility Model Publication No. 59-64891 (Fig. 3) Japanese Patent No. 3229744 (FIG. 1)

  By the way, the fixed type counterweight in which the counterweight is fixed to the swivel base is restricted by the legal total vehicle weight when traveling on the road. Therefore, a counterweight with part of the fixed counterweight as a tank type can be filled with oil or water every time the crane is operated, or the oil or water in the tank is wasted every time the vehicle is moved. There is a problem that it takes.

  In addition, a detachable counterweight is set for large mobile cranes, but this type can be separately sent so that the total weight of the vehicle due to legal requirements when driving on the road can be reduced. It can be convenient. By the way, the hydraulic oil tank of the mobile crane also secures the amount of hydraulic oil required when using various hydraulically driven attachments such as hydraulically driven jib and luffing jib that are detachably attached to the mobile crane. Even when the various hydraulic drive attachments were not used, the amount of hydraulic oil was secured, which was disadvantageous in terms of the total vehicle weight.

  As described above, in general, mobile cranes that are movable are subject to legal restrictions on the total weight of the vehicle when traveling on the road, and on the other hand, it is desired to increase the weight in order to increase crane capacity at the site. The present invention seeks to provide a mobile crane that solves such problems.

  In order to achieve the above object, a mobile crane according to claim 1 is provided with a swivel that can be swung on a vehicle frame, a telescopic boom that can be raised and lowered on the swivel, and a counterweight that can be attached to and detached from the swivel. A movable crane having a counterweight attached / detached by a counterweight attaching / detaching means, and a hydraulic oil tank provided on a swivel base, wherein the amount of oil in the hydraulic oil tank is at least a counter by the counterweight attaching / detaching means. In addition to ensuring the amount of oil required to attach and detach the weight, a second hydraulic oil tank is provided in the counterweight separately from the hydraulic oil tank, and both hydraulic oil tanks are connected when the counterweight is installed. It is a feature.

  According to a second aspect of the present invention, the mobile crane according to the first aspect is provided with an oil amount detecting means for detecting the oil amount of the second hydraulic oil tank, and a counter that changes from the oil amount detected by the oil amount detecting means. The total weight of the weight is calculated by the counter weight total weight calculating means, and the total weight of the counter weight calculated by the counter weight total weight calculating means is applied to the crane safety device. .

  In the mobile crane according to claim 1, since it is sufficient to secure at least the amount of oil in the hydraulic oil tank of the swivel base so that the counterweight can be attached and detached, the weight can be reduced in the traveling style of the crane vehicle. . Further, the reduced weight can be used for the reinforcing member of the crane up to the specified value of the total vehicle weight, and the crane performance can be improved.

  In addition, since the detachable counterweight is equipped with the second hydraulic oil tank, it is possible to replenish the hydraulic oil when the counterweight is lowered to the ground. Replenishment work can be done safely at the position.

  The mobile crane according to claim 2 can always set the crane performance according to the total weight of the counterweight according to the amount of hydraulic oil that changes when the crane operation is performed.

  Hereinafter, a mobile crane according to the present invention will be described with reference to FIGS. FIG. 1 is an overall view of a mobile crane according to the present invention. A swivel base 2 is mounted on the vehicle frame 1 so as to be turnable, and a telescopic boom 3 that is extendable and retractable is pivotally supported on the turntable 2 by a hoisting cylinder 4. A wire rope 6 fed from a winch 5 is a top boom 7. The hook block 8 and the sheaves of the top boom 7 are hung through the sheave at the tip, and the ends are fixed to the top boom 7. The hook block 8 can be moved up and down by winding or unwinding the winch 5. A detachable counterweight 9 that can be attached and detached by a counterweight attaching / detaching cylinder 11 is provided at the rear part of the swivel base 2.

First, a method for attaching / detaching a counterweight of a mobile crane will be described. Drive on the road and move the mobile crane to the work site. The mobile crane that has arrived at the work site is stopped at the installation location, the outriggers are extended horizontally, and the jacks are extended vertically. Raise the boom stored in the traveling style, lift the split type counterweight of the mobile crane that was separately sent by a trailer etc. with the mobile crane, between the cab of the vehicle frame 1 and the swivel 2 Are assembled in order from the basic divided counterweight at a position above the frame (see FIG. 8).
FIG. 7 is an explanatory view of the divided counterweight 9 as seen from the rear of the swivel base. As shown in FIG. 8, a basic counterweight C1 is placed at a position above the frame where the counterweight is temporarily placed, and counterweights C2 and C3 are installed on the left and right sides of the counterweight C1, respectively. Although not shown, as a method of installing the counterweights C2 and C3, a hole is formed in the upper portion of the counterweight C1, and a key-like support extending from the counterweights C2 and C3 is hooked into the hole. Thereafter, a counterweight C4 is installed on the counterweight C1, and counterweights C5 and C6 are installed on the left and right sides thereof. Assemble in order like this. The divided counterweights described above are pin-fixed to the adjacent counterweights so that they do not come off or fall due to an external force.
The crane performance is determined by the number of stacked counterweights of this divided structure, and the number of counterweights is determined and assembled so as to obtain the crane performance necessary for the work. After assembling the counterweight 9, turn the rear part of the swivel base 2 toward the side where the counterweight is placed, extend the counterweight attaching / detaching cylinder 11, rotate the cylinder rod, and move the lock part at the tip of the cylinder. The counterweight attaching / detaching cylinder 11 is reduced by being hooked on the counterweight 9. Thus, the counterweight 9 can be mounted on the swivel base 2. It should be noted that when disassembling, the operation is performed in the reverse of the above description.

The second hydraulic oil tank 10a of the counterweight 9 is mounted on a basic counterweight C1 that is detachable by the detachable cylinder 11 among the divided counterweights.
Depending on the work contents, although not shown, various hydraulically driven attachments such as a hydraulically driven jib and luffing jib are attached to the tip of the top boom 7 to perform crane work with a high lift and a high working radius. Note that the telescopic boom of the telescopic boom that lifts the counterweight 9, the undulation, the winch, and the counterweight attaching / detaching cylinder 11 correspond to the counterweight attaching / detaching means of claim 1.

  Next, a first embodiment of the counterweight with hydraulic oil tank according to the present invention will be described below. FIG. 2 is an explanatory diagram of the hydraulic oil tank 10 b and the counterweight 9 arranged on the swivel base 2. A second hydraulic oil tank 10 a is provided in the counterweight 9, and when the counterweight 9 is attached to the rear part of the swivel base 2, the hydraulic oil tank 10 b on the swivel base 2 can be communicated with the joint 13. . By communicating, the shortage of hydraulic oil in the hydraulic oil tank 10b on the swivel base 2 that secures at least the amount of oil necessary to attach and detach the counterweight 9 can be compensated.

  Therefore, the counterweight 9 sent separately does not require much hydraulic oil to be mounted on the mobile crane, that is, the mobile crane is installed, the counterweight 9 sent separately is suspended, and the counterweight on the vehicle frame 1 is suspended. As for the amount of hydraulic oil used at the time of work such as placing 9 in a place where it is temporarily placed, the required amount can be secured by the capacity of the hydraulic oil tank 10b on the swivel base 2. In general, when attaching various hydraulic drive attachments attached to the top boom tip, in order to ensure crane performance, a counterweight 9 is attached, and various hydraulic attachments are attached to the second hydraulic oil tank 10a of the counterweight 9. The required amount of hydraulic oil is installed. Therefore, the amount of hydraulic oil in the hydraulic oil tank 10b on the swivel base 2 can be reduced, and the weight can be reduced with respect to the restriction on the total vehicle weight by law when traveling on the road. Further, the reduced weight can be used for the reinforcing member of the crane up to the specified value of the total vehicle weight, and the crane performance can be improved.

  A second embodiment of the counterweight with hydraulic oil tank according to the present invention will be described below based on the block diagram shown in FIG. Since the configuration of the mobile crane is the same as described above, only the differences will be described. The oil amount detecting means 12 is installed in the second hydraulic oil tank 10a in the counterweight 9 of FIG. 3 and an oil level height signal is sent to the controller 15 and calculated in the controller 15 and calculated in the counterweight 9 2 The amount of hydraulic oil in the hydraulic oil tank 10a can be detected. Then, the detected hydraulic oil amount is multiplied by the specific gravity of the hydraulic oil, the hydraulic oil weight is calculated, and the total weight of the counterweight which is the sum of the counterweight weight and the hydraulic oil weight in the second hydraulic oil tank is calculated (controller 15 Corresponds to the counterweight total weight detecting means of claim 2) and can be sent to the crane safety device 16 to determine the crane performance.

  The crane safety device 16 stores in advance the rated total load corresponding to the parameters, compares the actual load acting on the telescopic boom with the actual load detected by the actual moment detecting means, and the rated total load. The crane operation is stopped when the load is exceeded. This safety device is a device that prevents the crane from being broken or overturned. Here, the initial parameters are a boom length parameter, a boom hoisting angle parameter, a hoisting moment parameter, a turning angle parameter, an outrigger extension width parameter, a counterweight weight parameter, and the like.

  FIG. 5 is an explanatory diagram for explaining the calculation of the controller 15 according to the second embodiment. In S1, the oil level signal is received from the oil amount detecting means 12, and the oil level of the second hydraulic oil tank 10a in the counterweight 9 is detected. In S2, the second oil level in the counterweight 9 is detected from the oil level. The hydraulic oil volume in the hydraulic oil tank is calculated, and the hydraulic oil weight in the counterweight 9 is calculated from the hydraulic oil volume in S3. Then, in S4, a counterweight total weight obtained by adding the counterweight weight and the hydraulic oil weight is calculated, and in S5, the counterweight total weight is input to the crane safety device 16 and reflected in the crane performance. After S5, the process returns to S1, and S1 to S5 are repeated. When the crane is operated during the crane operation, the amount of oil changes and the total weight of the counterweight changes, which can be reflected in the crane performance each time. In other words, the crane performance can be lowered when the hydraulic oil in the second hydraulic oil tank 10a of the counterweight 9 decreases, and the crane performance can be increased when the hydraulic oil increases.

In the present invention, the oil amount detecting means 12 is installed in the second hydraulic oil tank 10a in the counterweight 9. However, the oil amount detecting means is also installed in the hydraulic oil tank 10b in the swivel base so as to communicate with it. Of course, the amount of hydraulic oil in the entire hydraulic oil tank may be managed.
Then, when the counterweight 9 is removed, the amount of the hydraulic oil tank 10b on the swivel can be managed so as to be kept at a specified value. Further, it is only necessary to replenish the reduced amount of hydraulic oil on the hydraulic oil tank 10a side in the counterweight 9. Since the work can be carried out at a low position by being lowered to the ground when the counterweight 9 is removed, there is an effect that the working oil can be replenished safely.

  Further, as shown in FIG. 6, when the counterweight 9 is mounted, the forward / reverse rotation pump 17 installed on the swivel base 2 side is connected to the hydraulic oil tank 10 b on the swivel base 2 and the second hydraulic oil tank 10 a in the counterweight 9. It may be configured on the communication circuit and all the hydraulic oil may be moved from the second hydraulic oil tank 10a in the counterweight 9 to the tank 10b in the swivel when the counterweight is attached. At this time, since the total weight of the counterweight does not change during the crane operation, the oil amount detecting means 12 and a control unit for calculating the weight of hydraulic oil in the counterweight are not necessary. When the counterweight 9 is removed, the forward / reverse rotation pump 17 may return the hydraulic oil tank 10b of the swivel base 2 to the second hydraulic oil tank 10a in the counterweight.

  When moving the hydraulic oil from the second hydraulic oil tank 10a to the hydraulic oil tank 10b on the swivel base 2, the hydraulic oil is moved to the bottom of the second hydraulic oil tank 10a and from the hydraulic oil tank 10b on the swivel base to the second hydraulic oil tank 10a. When the oil is moved, the liquid level detectors 14 are respectively installed at the liquid level of the amount of oil necessary to attach and detach the counterweight 9 of the hydraulic oil tank 10b of the swivel base, and the forward / reverse rotation pump 17 is automatically stopped. You may do it. The operator may turn on / off the manual switch of the forward / reverse rotating pump while looking at the level gauge (not shown) or directly inside the hydraulic oil tank 10b on the swivel base.

  The joint 13 for communicating the second hydraulic oil tank 10a in the counterweight 9 and the hydraulic oil tank 10b on the swivel base 2 is not limited to a quick joint or the like, and other joints may be used. Needless to say.

  In the above embodiment, the mobile crane has been mainly described. However, the present invention is not limited to this, and it is needless to say that the present invention can be applied to all work machines having a detachable counterweight.

  Although one communication circuit is described, it is needless to say that there may be a plurality of circuits.

  Needless to say, each hydraulic oil tank has an air breather.

  The second hydraulic oil tank is provided in the counterweight, but is not limited to this. The second hydraulic oil tank is not provided in the counterweight and can be attached and detached alone, and the second hydraulic oil tank is placed on the counterweight. You may make it communicate with the hydraulic oil tank on a turntable. Alternatively, the installation location of the second hydraulic oil tank may be secured on the swivel base, and the second hydraulic oil tank may be placed with a separate crane so as to communicate with the hydraulic oil tank on the swivel base. In general, since the wall thickness of the hydraulic oil tank is thin and the strength is low, the hydraulic oil tank may be placed in a support on the ridge so as to surround each side of the hydraulic oil tank and suspended by attaching a hanging ring.

1 is an overall view of a mobile crane according to the present invention. It is detail drawing of the counterweight part of 1st Embodiment which concerns on invention of this application. It is detail drawing of the counterweight part of 2nd Embodiment which concerns on invention of this application. It is a block diagram explaining 2nd Embodiment which concerns on invention of this application. It is explanatory drawing explaining the calculation of the controller of 2nd Embodiment which concerns on invention of this application. It is explanatory drawing of other embodiment which concerns on invention of this application. It is explanatory drawing of a division | segmentation counterweight. It is explanatory drawing of the position on the flame | frame which temporarily places a counterweight when attaching / detaching a counterweight.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Vehicle frame 2: Swivel base 3: Telescopic boom 4: Lifting cylinder 5: Winch 6: Wire rope 7: Top boom 8: Hook block 9: Counterweight 10a: Second hydraulic oil tank 10b in counterweight: Swivel base Upper hydraulic oil tank 11: Counterweight attaching / detaching cylinder 12: Oil amount detecting means 13: Joint 14: Liquid level detector 15: Controller (counterweight total weight calculating means)
16: Crane safety device 17: Forward / reverse rotary pump

Claims (2)

A swivel that can be swung on a vehicle frame, a telescopic boom that can be raised and lowered on the swivel, and a counterweight that can be attached to and detached from the rear of the swivel, and the counterweight is attached and detached by a counterweight attaching / detaching means. In a mobile crane, a hydraulic oil tank is provided on a swivel, and the hydraulic oil tank has at least an oil amount necessary for attaching / detaching the counterweight by the counterweight attaching / detaching means. Separately, a mobile crane is provided with a second hydraulic oil tank in the counterweight, and both hydraulic oil tanks communicate with each other when the counterweight is mounted. 2. The counterweight total weight calculation according to claim 1, further comprising an oil amount detecting means for detecting an oil amount in the second hydraulic oil tank, and calculating a total weight of the counterweight that changes from the oil amount detected by the oil amount detecting means. And a total weight of the counterweight calculated by the counterweight total weight calculating means is applied to a crane safety device.

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