JP2545743Y2 - Mobile crane - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control device for a mobile crane.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a movable crane of this type has a swivel 2 disposed on a vehicle 1 so as to be swivelable, and pivotally supports a base end of the swivel 2 up and down on the swivel 2. A boom 3 including a multi-stage boom (base boom 3a, intermediate boom 3b, leading boom 3c) is provided. And this mobile clay
The turning device (not shown) includes a turning hydraulic motor 4 and the like between the vehicle 1 and the turning table 2, and an extending and contracting device (including an extendable hydraulic cylinder 5) between the booms of the boom 3. (Not shown), and a hydraulic cylinder 6 for raising and lowering is arranged at an appropriate position between the boom 3 and the swivel base 2, and by driving each of these hydraulic actuators, a boom-related operation such as turning, expanding and contracting, and raising and lowering the boom 3 is enabled. doing.

[0003] A main winch 7 is mounted on the swivel 2.
And a sub winch 8, and the wire rope 9 drawn out from the main winch 7 passes to the tip of the boom 3, and the main hook 10 is suspended from the tip of the boom 3. The wire rope 11 extended from the sub winch 8 suspends the sub hook 13 from the tip of the jib 12 when the jib 12 is added to the tip of the boom 3. The main winch 7 and the sub winch 8 drive the main winch hydraulic motor 14 and the sub winch hydraulic motor 15, respectively, so that the main hook 10 and the sub hook 13 can be moved up and down.

Further, a counterweight 16 is arranged at the rear end of the swivel 2 so as to prevent the crane from overturning during crane operation.

[0005] The mobile crane configured as above is
Each of the operation valves 4 is provided with a hydraulic circuit as shown in FIG.
By operating a, 5a, 6a, 14a, and 15a, the operation direction and the operation amount are determined and operated.

[0006] Next, this mobile crane can travel while stored in a traveling state at the site of crane work, but cannot travel and travel on public roads due to the extremely heavy weight of the vehicle. Therefore, the vehicle 1 and the swivel base 2 can be freely disengaged, the swivel base 2 is supported from the ground by a support device A described later, and the vehicle 1 and the swivel base 2 can be separated from each other. The attachment / detachment device B is configured to be attachable / detachable.

That is, when moving the mobile crane to another work site, the swivel 2 separated from the vehicle 1 is loaded on another vehicle (vehicle such as a trailer) and moved. Also,
The counterweight 16 removed from the swivel 2 is also loaded and moved on another vehicle (vehicle such as a trailer). Then, they are mounted again at the target work site and operated as a mobile crane. Although not described in detail here, before the turntable 2 is separated from the vehicle 1, the boom 3
Pulls out the intermediate boom 3b into which the leading boom 3c is inserted from the base boom 3a, and separates the intermediate boom 3b into which the leading boom 3c is inserted from the base boom 3a. The pulled-out boom is also loaded on another vehicle and moved.

[0008] The supporting device A and the attaching / detaching device B for separating the mobile crane will be described below. The support device A is configured as shown in FIG. That is, the outer box 1 attached to the rear end of the swivel 2
7. Inner boxes 18 and 19 which are inserted into the outer box 17 and extend and retract from the left and right ends, and hydraulic jacks 20 and 21 comprising hydraulic cylinders attached to the tips of the inner boxes 18 and 19 are arranged. 17, a rear hydraulic jack C comprising a hydraulic cylinder 22 disposed between the inner boxes 18 and 19, an outer cylinder 23 which is vertically detachably attached to a distal end of the base boom 3a, and fitted to the outer cylinder 23. A front hydraulic jack D comprising an inner cylinder 24 inserted and vertically extended and retractable, and a hydraulic cylinder 25 disposed between the outer cylinder 23 and the inner cylinder 24.
It consists of.

In addition, a bayonet structure portion is provided at a portion of the swivel bearing 26 that is disposed between the swivel base 2 and the vehicle 1 and allows the swivel base 2 to swivel relative to the vehicle 1, and the vehicle 1 and the swivel base 2 are disengaged. It is free.

The control circuit of the supporting device A is as shown in FIG. 2, and can be operated by a remote control device E. That is, the remote control device E includes a slide operation switch 28 for operating the hydraulic cylinder 22, a left-hand jack operation switch 27 for operating the hydraulic jack 20, a hydraulic jack 21
, A front jack operation switch 30 for operating the hydraulic cylinder 25, and a retractable overhang switch 3 for determining the operation direction of each hydraulic cylinder.
By operating each switch, each hydraulic cylinder can be operated via an electromagnetic switching valve (corresponding to a control valve in a utility model registration claim) described later. Then, as shown in FIG. 5, it is taken out from the side of the swivel base 2 by a cable connection and arranged so that remote control operation can be performed from the outside.

The electromagnetic switching valve 32 is an electromagnetic four-port 3
This is a position switching valve, which is switched so as to supply the hydraulic oil from the hydraulic pump 33 to the extension side or the contraction side of each hydraulic cylinder by operating the storage extension switch 31. The solenoid valve switching unit 34 is an electromagnetic type four-port three-position switching valve, and is operated by operating the slide operation switch 28 so as to switch and connect the hydraulic oil from the hydraulic pump 33 to the hydraulic cylinder 22. By operating the operation switch 28, the hydraulic oil from the hydraulic pump 33 is supplied to the hydraulic jack 20.
Switch connection so as to supply to

The electromagnetic switching valve 35 is an electromagnetic four-port 2
This is a position switching valve, which is switched so as to supply hydraulic oil from the hydraulic pump 33 to the hydraulic jack 21 by operating the right-hand jack operation switch 29. Solenoid switching valve 36
Is an electromagnetic type 4-port 2-position switching valve, which is switched so as to supply hydraulic oil from the hydraulic pump 33 to the hydraulic cylinder 25 by operating the front jack operation switch 30.

The remote control device E configured as described above is used as follows when the vehicle 1 and the turntable 2 are separated or combined. First, in the case of separation, the vehicle 1 and the swivel base 2 are disengaged from each other by the bayonet structure portion of the swivel bearing 26 portion. Then, the slide operation switch 28 is operated, and the storage extension switch 31 is operated to the extension side to extend the hydraulic cylinder 22 and extend the inner boxes 18 and 19 from the outer box 17. After that, the left jack operation switch 27, the right jack operation switch 29, and the front jack operation switch 30 are operated, and the retractable extension switch 31 is operated.
Is operated to extend the hydraulic jacks 20, 21 and the hydraulic cylinder 25 to extend the inner cylinder 23 from the outer cylinder 22.

In this way, as shown in FIG. 5, the turntable 2 is supported from the ground, and the turntable 2 is lifted from the vehicle 1. Then, the vehicle 1 is moved, and a vehicle such as a trailer is positioned under the swivel 2 in place of the vehicle 1. Each cylinder is reduced by the remote control device E, and the swivel 2 is loaded on the vehicle such as the trailer. Let it. Conversely, when the separated vehicle 1 and the turntable 2 are to be connected, the operation may be performed in the reverse of the above, and a detailed description thereof will be omitted.

Next, the counterweight 16 is turned from the swivel 2.
The attachment / detachment device B for making the attachment / detachment removable will be described below.
As shown in FIG. 4, the counterweight 16 is composed of a plurality of weights 16a, 16b, 16c and 16d. When the mobile crane is moved to another work site, the counterweight 16 is detached from the rear end of the swivel 2. It is designed to be loaded and transported on another vehicle (vehicle such as a trailer). The case where the counterweight 16 loaded and transported on another vehicle (a vehicle such as a trailer) is mounted on the rear end of the swivel 2 will be described below.

First, the counterweight 16 loaded and transported on another vehicle (a vehicle such as a trailer) is lifted by a crane in a state where the counterweight is not attached to the rear end of the swivel 2, and is shown by a dashed line in FIG. As described above, the vehicle 1 is loaded on the portion immediately behind the driver's seat. Thereafter, the turntable 2 is turned so that the tip of the boom 3 is directed to the rear of the vehicle 1. The pair of hydraulic jacks 37 and 38 arranged on the left and right between the weights 16a and 16b are extended, and the weights 16
The weights 16b, 16c, and 16d are lifted from a. Then, a pair of left and right arms 39 and 40 is extended to the rear end of the swivel 2. Although not shown, the arms 39 and 4
Numeral 0 allows the hydraulic cylinders 41 and 42 to extend and retract from the swivel 2 so as to be able to expand and contract. Lifted weights 16b, 16 are placed on the extended arms 39, 40.
c, 16d are located, and by reducing the hydraulic jacks 37, 38 from this state, a pair of left and right arms 3
Weights 16b, 16c, and 16d can be stacked on 9, 40.

After that, the arms 39 and 40 and the weight 16
b is connected and fixed. When the hydraulic jacks 37 and 38 are reduced, the weight 16a is brought into close contact with the weight 16b, and the weight 16a can be attached to the rear end of the swivel 2 together with the weights 16b, 16c and 16d. Conversely, when removing the counterweight 16 from the swivel 2, the above procedure may be reversed. As described above, the attaching / detaching device B includes the arms 39 and 40 and the hydraulic jacks 37 and 38.

Note that, as described above, the counter weight 16
The attachment / detachment device B for attaching and detaching has a control circuit similar to that of the support device A, and is operated by a remote control device F (not shown). That is, instead of the hydraulic cylinder 22 of the support device A, hydraulic cylinders 41 and 42 for extending and contracting the arms 39 and 40 are arranged, and the hydraulic jack 20 and
The control circuit is a control circuit in which hydraulic jacks 37 and 38 are arranged instead of 21. The remote control device F is also composed of switches for operating these hydraulic cylinders. The remote control device F is also taken out from the side of the swivel base 2 by cable connection and arranged so that remote control operation can be performed from the outside.

[0019]

SUMMARY OF THE INVENTION Such a supporting device A
In the mobile crane provided with the attachment and detachment device B, a plurality of sheaves are arranged at the tip of the tip boom 3c and the main hook 10, respectively, and a wire hung between the sheaves by a lifting load and a lifting height. The number of ropes 9 is changed. In this case, the boom 3 is set to a substantially horizontal state, the main hook 10 is placed on the ground, the separation distance between the main hook 10 and the tip of the boom 3c is reduced, and the work of passing the tip of the wire rope 9 between the sheaves is performed. is there.

The operation for reducing the number of wire ropes 9 will now be described. In this case, as the number of the wire ropes 9 is reduced, the length of the wire rope 9 crawling on the ground is increased, and the length of the wire rope 9 passing between the sheaves is also increased. Had to go to the driver's seat of the crane and take up the main winch 7, which was a cumbersome operation.

Conversely, when increasing the number of wire ropes 9, as the number of wire ropes 9 increases, the operator must go to the driver's seat of the crane and lower the main winch 7. In particular, when the main winch 7 is lowered, when the main hook 10 is placed on the ground, unless the wire rope 9 is pulled by human power from the tip side of the boom 3, the wire rope 9 is turbulently wound on the winch drum. Therefore, a worker different from the crane operator is required.

Further, such a mobile crane is provided with a jib 12 which is added to the tip of the boom 3. The jib 12 is generally stored along the side surface of the base boom 3a when not in use, as shown in FIG. 4, and is added to the tip of the front boom 3c when in use, so that the boom length is increased and a lift height is required. Sometimes used.

The stored jib 12 is added to the tip of the leading boom 3c as follows.
As shown in FIG. 5, the jib 12 is accommodated by supporting devices G and H arranged at the base end and the tip end of the jib 12 along the side surface of the base boom 3a. First, the jib 12 is stored obliquely under the lower side of the base boom 3a so as not to interfere with the up-and-down cylinder 6 by an elevating support device (not shown) provided in a support device G disposed on the base end side of the jib 12. (FIG. 6
After that, both ends of the base end of the jib are pivotally connected 41, 42 to the lower right and left of the boom head of the boom 3c in the direction of the locus of the boom 3 so as to swing freely. Release the connection with the boom 3a. Then, the wire rope 11 having its tip fixed to the sub hook 13 is hung around the tip sheave 41 of the jib 12 from the tip boom 3c, and then hooked to the base end of the base boom 3a. Next, boom 3
Is raised, the boom 3c is extended beyond the base boom 3a, and the tip end of the jib 12 and the base boom 3 are supported by the support device H.
Release engagement with a. Then, the wire rope 11 is paid out from the sub winch 8, and the jib 12 is gradually moved to the boom 3c.
Hang from the tip of

The jib 1 suspended at the tip of the tip boom 3c
2 removes the wire rope 11 locked on the base end of the base boom 3a, and feeds the wire rope 11 by the sub winch 8 so that the sub hook 13 contacts the tip of the jib 12. After that, the wire rope 11 is fed in again by the sub winch 8, and the shib 12 is raised about the pivotal connections 41 and 42. After the jib 12 is positioned along the extension of the boom 3, the boom 3 is folded down, and the upper part of the boom head and the tip of the jib 12 are paired with a pair of right and left tension members 4.
Connect at 4 , 45 . Then, the wire rope 11 is paid out by the sub winch 8, and the contact between the sub hook 13 and the tip of the jib 12 is released. The jib 12 added to the tip of the front boom 3c in this way is operated in the reverse manner to be stored along the side surface of the base boom 3a.

When the jib 12 is added to the tip of the boom 3 or stored along the side surface of the base boom 3a in this way, the operation of raising and lowering the boom 3, expanding and contracting the same, and operating the sub winch 8 are required. In each case, the operator had to move to the crane operator's seat arranged on the swivel 2 and the operation was troublesome. In addition, when the jib 12 is added, the operation must be performed during the raising / lowering operation of the boom 3, the expansion / contraction operation, and the operation of the sub winch 8 without being able to confirm the movement from the crane operator's seat.

The present invention has been made in consideration of the above problems,
Alternatively, in a mobile crane in which the attachment / detachment device B can be remotely controlled by a remote control device, the crane-related operations can be operated using the remote control device, and the above-mentioned operation is facilitated. It is.

[0027]

SUMMARY OF THE INVENTION In order to achieve the above object, a mobile crane according to the present invention is provided with a turning hydraulic motor for turning a swivel on a vehicle and turning the swivel. A hydraulic cylinder for raising and lowering the boom that is arranged between the swivel and the boom so that the boom can be raised and lowered, a hydraulic cylinder for raising and lowering the boom, and a hydraulic cylinder for expanding and contracting the boom that is composed of a multistage boom that can be extended and retracted, and a tip of the boom A mobile crane comprising hydraulic actuators for winch hydraulic motors for raising and lowering hooks suspended from a hydraulic crane, and enabling the relevant operation of the crane by driving the hydraulic actuators. The turntable is made to be detachable, and the turntable is supported from the ground by a support device such as a hydraulic jack provided on the turntable and the boom. A control valve in which the table is configured to be separable, or a counterweight disposed at the rear end of the swivel table is configured to be detachable by a detachable device including a hydraulic cylinder or the like, and the support device or the detachable device is remotely controlled by a remote control device. In a mobile crane configured to be operable according to (1), an oil passage for supplying and discharging hydraulic pressure from the control valve to the support device or the detachable device is connected to supply and discharge hydraulic pressure to a hydraulic actuator for related operation of the crane. A switching device for selectively switching the operation of the crane, and a hydraulic actuator for related operation of the crane, which is switched and connected by the switching device, can be operated by the remote control device.

[0028]

In the mobile crane of the present invention constructed as described above, if the hydraulic actuator for the related operation of the crane to be operated by the remote control device is switched and selected by the switching device, the hydraulic actuator for the related operation of the selected crane is selected. Remote control operation can be performed by a remote control device that remotely controls the support device or the attachment / detachment device, thereby facilitating work.

[0029]

FIG. 1 shows an embodiment of a mobile crane according to the present invention.
This is illustrated and described below. Note that, in the following description, the same reference numerals are used for the same reference numerals, and the description thereof will be omitted. The hydraulic circuit illustrated in FIG. 1 includes a portion related to the hydraulic cylinder 25 of the control circuit of the support device A illustrated and described in FIG. 2 illustrates a portion related to the motor 14.

In FIG. 1, 50a and 50b1 are quick couplings (corresponding to a switching device in a utility model registration claim).
And is provided in a supply / discharge oil passage leading to a cylinder-side oil chamber of a hydraulic cylinder 25 used for the support device A. 51
Reference numerals a and 51b1 denote quick couplings (corresponding to the switching device of the utility model registration claims), which are interposed in a supply / discharge oil passage leading to the piston rod oil chamber side of the hydraulic cylinder 25 used for the support device A. doing. Reference numeral 50b2 denotes a quick coupling (corresponding to the switching device in the utility model registration claims) joined to the quick coupling 50a, and the hydraulic motor 14 for the main winch.
Are connected to an oil passage branched from a supply / discharge oil passage on the winding side. Reference numeral 51b2 denotes a quick coupling (corresponding to the switching device in the utility model registration claims) joined to the quick coupling 51a, and is an oil branched from a supply / discharge oil passage on the lowering side of the main winch hydraulic motor 14. Connected to the road.

By arranging the quick coupling in the oil supply / discharge passage of the hydraulic cylinder 25 and the hydraulic motor 14 for the main winch, the movable crane of the present invention operates as follows. The joint between the quick joints 50a and 50b1 is released, and the quick joint 50a and the quick joint 50b2 are joined. Further, the joints of the quick joints 51a and 51b1 are released, and the quick joint 5
1a and the quick joint 51b2 are joined. And the operating valve 14
In the state where a is at the neutral position, the front jack operation switch 30 and the retractable overhang switch 31 of the remote control device E are operated. Then, instead of the hydraulic cylinder 25, the main winch hydraulic motor 14 is wound up and down by the operation of the remote control device E via the electromagnetic switching valves 32 and 36.

Therefore, when changing the number of wires of the wire rope 9, the main winch hydraulic motor 14
Can be operated by operating the remote control device E, so that the operator does not need to go to the driver's seat of the crane and operate the main winch 7 to operate the main winch 7 near the tip of the boom 3. It is possible to relieve troublesome work.

In the above-described embodiment, the case where the quick coupling is used as the switching device has been described. However, instead of the quick coupling, connection switching of these oil supply / drain passages is arranged by selectively arranging a switching valve. You may.

In the above embodiment, the hydraulic cylinder 2
This is an embodiment only in the case where the hydraulic motor 14 for the main winch is connected in place of 5; however, the present invention is not limited to this, and a hydraulic actuator for related operation of the crane may be connected in place of each hydraulic actuator used in the support device A. You may. For example, the hydraulic motor 14 for the main winch is replaced with the hydraulic jack 20, the hydraulic motor 15 for the sub winch is replaced with the hydraulic cylinder 22, the hydraulic cylinder 6 for raising and lowering is replaced with the hydraulic jack 21, and the hydraulic cylinder for expanding and contracting is replaced with the hydraulic cylinder 25. 5 may be connected.

When the connection is changed as described above, when the jib 12 is added to the tip of the boom 3 or stored along the side surface of the base boom 3 a, the operation of raising and lowering the boom 3, expanding and contracting the boom 3, Since the operation can be performed by the operation of the remote control device E, the operator can operate without moving to the crane operator's seat arranged on the swivel table 2 each time and is released from the troublesome operation. In addition, when the jib 12 is added, the operation of raising and lowering the boom 3, expanding and contracting the operation of the boom 3, and operation of the sub winch 8 can be operated from a position where the movement can be clearly seen, so that the operation can be performed safely and quickly.

Further, it is needless to say that the present invention can be similarly applied to a mobile crane provided with the remote control device F for remotely controlling the attachment / detachment device B for attaching / detaching the counterweight 16, so that detailed description is omitted here. I do.

[0037]

According to the mobile crane of the present invention constructed and operated as described above, the hydraulic actuator for related operation of the crane is remotely controlled by the remote control device for remotely controlling the supporting device or the detachable device. And work can be facilitated.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a control circuit of the mobile crane of the present invention.

FIG. 2 is an explanatory diagram of a control circuit of a support device of the mobile crane.

FIG. 3 is an explanatory diagram of a hydraulic circuit of a crane-related operation hydraulic actuator of a mobile crane.

FIG. 4 is an explanatory view of a mobile crane.

FIG. 5 is an explanatory view of a support device for a mobile crane.

FIG. 6 is an explanatory view of an extension jib of the mobile crane.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 vehicle 2 turntable 3 boom 4 turning hydraulic motor 5 telescopic hydraulic cylinder 6 undulating hydraulic cylinder 10 main hook 13 subhook 14 hydraulic motor for main winch 15 hydraulic motor for subwinch 16 counterweight 20 hydraulic jack 21 hydraulic jack 32 electromagnetic Switching valve (control valve) 34 Electromagnetic switching valve (control valve) 35 Electromagnetic switching valve (control valve) 36 Electromagnetic switching valve (control valve) 50a Rapid coupling (switching device) 50b1 Rapid coupling (switching device) 50b2 Rapid coupling (switching device) ) 51a Rapid coupling (switching device) 51b1 Rapid coupling (switching device) 51b2 Rapid coupling (switching device) A Supporting device B Detachable device E Remote control device F Remote control device

Claims (1)

(57) [Scope of request for utility model registration] 1. A turning hydraulic motor for turning a turntable on a vehicle and turning the turntable. A boom is arranged on the turntable so that the turntable can be raised and lowered, and the boom is arranged between the turntable and the boom. Includes hydraulic actuators for raising and lowering the hydraulic cylinder for raising and lowering, a hydraulic cylinder for expanding and contracting the boom, and a hydraulic motor for a winch that raises and lowers a hook suspended from the end of the boom. A movable crane configured to enable a related operation of the crane by driving each of the hydraulic actuators, and particularly includes a hydraulic jack provided on the swivel base and the boom so that the vehicle and the swivel base can be freely disengaged. With the support device, the swivel is supported from the ground, and the vehicle and the swivel can be separated,
Alternatively, the counterweight arranged at the rear end of the swivel is configured to be detachable by a detachable device including a hydraulic cylinder or the like,
In a mobile crane in which the support device or the detachable device is configured to be operable by a control valve remotely controlled by a remote control device, an oil passage for supplying and discharging hydraulic pressure from the control valve to the support device or the detachable device is provided. A switching device for selectively switching the connection of the oil passage so as to supply and discharge the hydraulic pressure to the hydraulic actuator for the related operation is arranged, and the hydraulic actuator for the relevant operation of the crane switched and connected by the switching device can be operated by the remote control device. A mobile crane characterized in that: