JP6789207B2 - Construction machinery - Google Patents

Description

The present invention relates to construction machinery such as a hydraulic excavator.

Generally, when transporting a construction machine such as a hydraulic excavator to a work site using a transport vehicle, work is performed with a vehicle body composed of, for example, a lower traveling body and an upper turning body so as not to exceed the weight limit according to the Road Traffic Act. It is necessary to transport it separately from the equipment. Furthermore, in a large construction machine, the weight limit is exceeded even with the vehicle body alone, so the lower traveling body of the vehicle body is assembled with a center frame to which the upper swivel body is attached and a floating wheel, driving wheels, and tracks on the side frame. Divide into the attached left and right side frame assemblies. The center frame to which the upper swing body is attached and the left and right side frame assemblies are transported to the work site by separate transport vehicles so that they can be assembled at the work site.

For this reason, large construction machines are provided with a plurality of jack-up cylinders and a jack-up control bubble for controlling the supply and discharge of pressure oil to each jack-up cylinder in the center frame of the lower traveling body. The jack-up control bubble is connected to a hydraulic source including a hydraulic pump and a hydraulic oil tank mounted on the upper swing body via a hydraulic hose or the like. Therefore, by supplying pressure oil to each jack-up cylinder via the jack-up control bubble, the jack-up work of lifting the center frame from the ground is performed, and the center frame is loaded and unloaded on the transport vehicle. (See Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-16208

Here, when jacking up the center frame, normally, the control valve for jacking up provided on the center frame is mounted on the upper swing body with the drive of the hydraulic pump stopped by the engine. It is necessary to connect the hydraulic pump via the supply pipe and connect the hydraulic oil tank mounted on the upper swing body via the return pipe.

On the other hand, when the hydraulic pump is driven by the engine, for example, when only the supply line connected to the hydraulic pump by mistake is connected to the jack-up control valve, the hydraulic oil tank and the jack Since the valve is not connected to the up control valve via the return pipe, the pressure oil supplied from the hydraulic pump to the jack up control valve cannot be discharged to the hydraulic oil tank. As a result, the hydraulic equipment (jack-up control valve, etc.) constituting the hydraulic circuit for the jack-up cylinder may be damaged.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to protect the hydraulic equipment constituting the hydraulic circuit for the jack-up cylinder when the jack-up cylinder is divided and transported. It is to provide construction machinery.

In order to solve the above problems, the present invention includes a self-propelled lower traveling body and an upper rotating body rotatably mounted on the lower traveling body, and the lower traveling body is provided with the upper turning body. The upper swivel body has a center frame for supporting the body and left and right side frames located on both the left and right sides of the center frame and extending in the front and rear directions, and the upper swivel body is swiveled to form a support structure. The lower traveling body includes a frame, an engine mounted on the swivel frame, a hydraulic pump driven by the engine, and a hydraulic oil tank for storing hydraulic oil supplied toward the hydraulic pump. The center frame includes four jack-up cylinders provided apart from each other in the front, rear, left, and right directions in order to lift the lower traveling body and the upper rotating body from the ground, and the hydraulic pump. A jack-up control valve connected to the jack-up cylinder to control hydraulic oil to the jack-up cylinder, a supply-side coupler interposed in a supply pipeline connecting the hydraulic pump and the jack-up control valve, and the jack-up control. It is applied to a construction machine having a connection device provided with a valve and a return coupler interposed in a return pipeline connecting the hydraulic oil tank.

A feature of the present invention is that the connecting device enables the supply line to be connected to the supply side coupler after the return line is connected to the return side coupler, and the supply line is connected to the supply line. A attachment / detachment procedure limiter that enables the return pipe to be removed from the return coupler after being removed from the supply side coupler is provided , and the connecting device is provided on the pedestal attached to the center frame and the pedestal. A connection jig in which the supply side coupler and the return side coupler are arranged in parallel and the attachment / detachment procedure limiter are further provided, and the attachment / detachment procedure limiter is between the pedestal and the connection jig. A bracket located on the return side coupler and extending along the lower side of the supply side coupler, and a rotation fulcrum provided in the bracket between the return side coupler and the supply side coupler, and the supply A cover member that can rotate between a side coupler and the supply line in a closed position and an open position, and a return line provided in the return line at a position corresponding to the rotation fulcrum of the cover member. The cover member is configured by a protrusion that rotates the cover member from the closed position to the open position when the return side coupler is connected to the coupler .

According to the present invention, it is possible to connect the supply line to the supply side coupler after connecting the return line to the return side coupler, and after removing the supply line from the supply side coupler, the return side coupler It is possible to remove the return pipe from. Therefore, when the supply line is attached to the supply side coupler, the return line is attached to the return side coupler, so that the pressure oil from the hydraulic pump can be discharged to the hydraulic oil tank through the return line. .. As a result, it is possible to suppress the generation of excessive pressure in the hydraulic circuit for the jack-up cylinder and protect the hydraulic equipment such as the jack-up control valve when the equipment is divided and transported.

It is a front view which shows the hydraulic excavator for dismantling as a construction machine by embodiment of this invention. It is a front view which shows the upper swing body and the lower traveling body of the dismantling hydraulic excavator. It is sectional drawing which looked at the lower traveling body of the dismantling hydraulic excavator from the direction of arrow III-III in FIG. It is a left side view which looked at the lower running body from the direction of arrow IV-IV in FIG. It is a front view which shows the state which jacks up the center frame and the upper swing body of a lower traveling body. It is a perspective view which shows the supply line connection port, the return line connection port, etc. provided on the upper swivel body side. It is an enlarged view which shows the connection device in FIG. It is a hydraulic circuit diagram including a jack-up cylinder, a side frame attachment / detachment cylinder, and a jack-up control valve. It is a perspective view which shows the state which the supply line connection hose and the return line connection hose are removed with respect to the supply side coupler and the return side coupler of a connection device. It is a perspective view which shows the state which the supply line connection hose and the return line connection hose are connected to the supply side coupler and the return side coupler of a connection device. It is a top view which shows the state which the cover member holds a closed position when the return line connection hose is not connected to the return side coupler. FIG. 5 is a plan view showing a state in which the cover member is rotated to the open position when the return pipeline connection hose is connected to the return side coupler. It is a top view which shows the state which connected the supply line connection hose to the supply side coupler. It is a front view which shows the state which the center frame to which the upper swing body is attached is loaded on the trailer. It is a front view which shows the state which jacked up the center frame.

Hereinafter, embodiments of the construction machine according to the present invention will be described in detail with reference to FIGS. 1 to 15 by taking a large-scale dismantling hydraulic excavator as an example.

In the figure, the dismantling hydraulic excavator 1 is configured by a multi-boom type hydraulic excavator, and is suitably used for dismantling work of, for example, a high-rise building. The dismantling hydraulic excavator 1 includes a self-propelled crawler type (tracking type) lower traveling body 2 and an upper rotating body 34 described later, which is mounted on the lower traveling body 2 so as to be swivelable via a swivel wheel 3. The lower traveling body 2 and the upper turning body 34 constitute a vehicle body. A front device 61, which will be described later, is provided on the front side of the upper swivel body 34 so as to be able to move up and down, and the front device 61 is used to dismantle a high-rise building.

Since the dismantling hydraulic excavator 1 is used for dismantling a high-rise building, the machine weight reaches about 45 to 100 tons, for example. Therefore, when transporting the dismantling hydraulic excavator 1 to the work site, for example, the dismantling hydraulic excavator 1 is mounted on the front device 61, the center frame 5 to which the upper swing body 34 is attached, and the left and right described later. The side frames 6 and 7 of the above and the counter weight 37 described later are divided, and these plurality of divided bodies (units) are individually loaded on the trailer and transported to the work site. Then, each of the individually transported divisions is assembled at the work site.

The lower traveling body 2 has a track frame 4 provided with a turning wheel 3. The track frame 4 is a center frame 5 arranged at the center in the left and right directions and having a swivel wheel 3 on the upper side, and a left side extending in the front and rear directions located on both the left and right sides of the center frame 5. It is configured to include a frame 6 and a right side frame 7. Drive wheels 8 are provided on one side (rear side) in the front and rear directions of the side frames 6 and 7, respectively, and idle wheels 9 are provided on the other side (front side) in the front and rear directions of the side frames 6 and 7. Are provided respectively. An endless track (crawler) 10 is wound around the drive wheel 8 and the idle wheel 9, and the lower traveling body 2 stabilizes the uneven work site by rotating the track 10 around the drive wheel 8. You can drive.

As shown in FIGS. 3 and 4, a left front rotating arm 5A is rotatably attached to the left front side of the center frame 5 constituting the lower traveling body 2 in the left and right directions (horizontal direction). Similarly, the right front rotating arm 5B is rotatably attached to the right front side of the center frame 5, and the left rear rotating arm 5C is rotatably attached to the left rear side of the center frame 5. A right rear rotation arm 5D is rotatably attached to the right rear side of the above. Each of these rotating arms 5A to 5D is rotationally displaced between the jack-up position shown in FIG. 3 and the storage position stored on the center frame 5 side.

The four jack-up cylinders 11 to 14 are attached to the tips of the rotating arms 5A to 5D of the center frame 5, and are provided apart from each other in the front, rear, left, and right directions. That is, the left front jack-up cylinder 11 is attached to the tip of the left front rotating arm 5A of the center frame 5, the right front jack-up cylinder 12 is attached to the tip of the right front rotating arm 5B, and the left rear jack-up cylinder 13 is attached. The right rear jack-up cylinder 14 is attached to the tip of the left rear rotating arm 5C, and is attached to the tip of the right rear rotating arm 5D. These four jack-up cylinders 11 to 14 are arranged so as to be expandable and contractible in the upward and downward directions. For example, as shown in FIG. 5, a jack-up operation for lifting the center frame 5 to which the upper swing body 34 is attached from the ground. Is to do.

Further, on the left end side of the center frame 5, a left front overhang beam 5E and a left rear overhang beam 5F are provided apart from each other in the front and rear. On the right end side of the center frame 5, a right front overhang beam 5G and a right rear overhang beam 5H are provided apart from each other in the front and rear (see FIG. 3).

The left side frame 6 is provided with front and rear brackets 6A and 6B overhanging to the right toward the center frame 5, and the front bracket 6A corresponds to the left front overhang beam 5E of the center frame 5 and the rear bracket 6B. Corresponds to the left rear overhang beam 5F of the center frame 5. The left side frame 6 is provided with a left side frame attachment / detachment cylinder 15 located between the front and rear brackets 6A and 6B. Connecting pins 15A and 15B are provided at both ends of the left side frame attachment / detachment cylinder 15.

In the state where the left side frame attachment / detachment cylinder 15 is extended, the connecting pin 15A connects the left front projecting beam 5E of the center frame 5 and the front bracket 6A of the left side frame 6, and the connecting pin 15B connects the center frame 5 The left side frame 6 is attached to the center frame 5 by connecting the left rear overhang beam 5F and the rear bracket 6B of the left side frame 6. On the other hand, in the state where the left side frame attachment / detachment cylinder 15 is reduced, the connecting pin 15A is detached from the left front overhang beam 5E of the center frame 5, and the connecting pin 15B is detached from the left rear overhang beam 5F of the center frame 5. As a result, the left side frame 6 is removed from the center frame 5.

The right side frame 7 is provided with front and rear brackets 7A and 7B overhanging to the left toward the center frame 5, and the front bracket 7A corresponds to the right front overhang beam 5G of the center frame 5 and the rear bracket 7B. Corresponds to the right rear overhang beam 5H of the center frame 5. The right side frame 7 is provided with a right side frame attachment / detachment cylinder 16 located between the front and rear brackets 7A and 7B. Connecting pins 16A and 16B are provided at both ends of the right side frame attachment / detachment cylinder 16.

In the state where the right side frame attachment / detachment cylinder 16 is extended, the connecting pin 16A connects the right front overhang beam 5G of the center frame 5 and the front bracket 7A of the right side frame 7, and the connecting pin 16B connects the center frame 5 The right side frame 7 is attached to the center frame 5 by connecting the right rear overhang beam 5H and the rear bracket 7B of the right side frame 7. On the other hand, in the state where the right side frame attachment / detachment cylinder 16 is reduced, the connecting pin 16A is separated from the right front overhang beam 5G of the center frame 5, and the connecting pin 16B is separated from the right rear overhang beam 5H of the center frame 5. As a result, the right side frame 7 is removed from the center frame 5.

As shown in FIG. 3, the jack-up control valve 17 is provided on the center frame 5. The jack-up control valve 17 controls the supply of pressure oil from the hydraulic pump 19 described later to the jack-up cylinders 11 to 14 and the left and right side frame attachment / detachment cylinders 15 and 16. Further, the center frame 5 is provided with connection devices 45, which will be described later, between the left front rotation arm 5A and the right front rotation arm 5B, and between the left rear rotation arm 5C and the right rear rotation arm 5D, respectively. Has been done. These two connecting devices 45 are connected to the jack-up control valve 17 via the traveling body side supply pipe line 20B and the traveling body side return pipe line 24B, which will be described later, respectively.

Next, a hydraulic circuit including the jack-up cylinders 11 to 14, left and right side frame attachment / detachment cylinders 15 and 16, and a jack-up control valve 17 will be described with reference to FIG.

In FIG. 8, a supply pipeline 20 for supplying pressure oil from the hydraulic pump 19 to various hydraulic actuators is connected to the discharge side of the hydraulic pump 19 driven by the engine 18. A main control valve 21 is provided in the middle of the supply line 20. The control valve 21 is composed of an aggregate of a plurality of directional control valves corresponding to various hydraulic actuators mounted on the dismantling hydraulic excavator 1, and controls the direction of the pressure oil supplied to each hydraulic actuator. Here, the supply pipeline 20 is composed of a swivel body side supply pipe 20A located on the upper swivel body 34 side and a traveling body side supply pipe 20B located on the lower traveling body 2 side with reference to the connecting device 45. There is.

A center bypass pipe 22 is connected to the traveling body side supply pipe 20B. A return line 24 is connected to the hydraulic oil tank 23 which constitutes a hydraulic source together with the hydraulic pump 19, and the return line 24 is connected to the center bypass line 22. The return line 24 discharges (refluxes) the return oil from the center bypass line 22 to the hydraulic oil tank 23. Further, the return line 24 and the direction control valves 25, 26, 27, 28, 29, 30 described later are connected via branch lines 25C, 26C, 27C, 28C, 29C, 30C, respectively. The return oil from the jack-up cylinders 11 to 14 and the left and right side frame attachment / detachment cylinders 15 and 16 is discharged to the hydraulic oil tank 23 through the return pipe line 24. Here, the return pipe 24 is composed of a swivel body side return pipe 24A located on the upper swivel body 34 side and a traveling body side return pipe 24B located on the lower traveling body 2 side with reference to the connecting device 45. There is.

The jack-up control valve 17 is provided in the middle of the center bypass pipeline 22. The jack-up control valve 17 includes a directional control valve 25 that controls the supply and discharge of pressure oil to the left front jack-up cylinder 11, a directional control valve 26 that controls the supply and discharge of pressure oil to the right front jack-up cylinder 12, and the left rear. A directional control valve 27 that controls the supply and discharge of pressure oil to the jack-up cylinder 13, a directional control valve 28 that controls the supply and discharge of pressure oil to the right rear jack-up cylinder 14, and a pressure oil for the left side frame attachment / detachment cylinder 15. It has a directional control valve 29 that controls supply and discharge, and a directional control valve 30 that controls the supply and discharge of pressure oil to the right side frame attachment / detachment cylinder 16. Each of these directional control valves 25 to 30 is configured by an electromagnetic pilot type directional control at 6 ports and 3 positions, respectively, and the electromagnetic pilot section of each directional control valve 25 to 30 is electrically connected to a jack-up controller 33 described later. Has been done.

The directional control valve 25 and the left front jack-up cylinder 11 are connected via main pipelines 25A and 25B. The directional control valve 25 holds the neutral position when the pilot signal is not supplied from the jack-up controller 33, and is switched from the neutral position to the switching position (a) or (b) by supplying the pilot signal. When the directional control valve 25 is switched to the switching position (a), pressure oil is supplied to the bottom side oil chamber 11A of the left front jack-up cylinder 11, and the left front jack-up cylinder 11 extends. When the directional control valve 25 is switched to the switching position (b), pressure oil is supplied to the rod-side oil chamber 11B of the left front jack-up cylinder 11, and the left front jack-up cylinder 11 shrinks.

Similarly, the directional control valve 26 and the right front jack-up cylinder 12 are connected via main pipelines 26A and 26B. The directional control valve 26 is switched from the neutral position to the switching position (c) or (d) according to the pilot signal from the jack-up controller 33. As a result, pressure oil is supplied to the bottom side oil chamber 12A or the rod side oil chamber 12B of the right front jack-up cylinder 12, and the right front jack-up cylinder 12 expands and contracts.

The directional control valve 27 and the left rear jack-up cylinder 13 are connected via main pipelines 27A and 27B. The directional control valve 27 is switched from the neutral position to the switching position (e) or (f) according to the pilot signal from the jack-up controller 33. As a result, pressure oil is supplied to the bottom side oil chamber 13A or the rod side oil chamber 13B of the left rear jack-up cylinder 13, and the left rear jack-up cylinder 13 expands and contracts.

The directional control valve 28 and the right rear jack-up cylinder 14 are connected via main pipelines 28A and 28B. The directional control valve 28 is switched from the neutral position to the switching position (g) or (h) according to the pilot signal from the jack-up controller 33. As a result, pressure oil is supplied to the bottom side oil chamber 14A or the rod side oil chamber 14B of the right rear jack-up cylinder 14, and the right rear jack-up cylinder 14 expands and contracts.

The directional control valve 29 and the left side frame attachment / detachment cylinder 15 are connected via main pipelines 29A and 29B. The directional control valve 29 is switched from the neutral position to the switching position (j) or (k) according to the pilot signal from the jack-up controller 33. As a result, pressure oil is supplied to the bottom side oil chamber 15C or the rod side oil chamber 15D of the left side frame attachment / detachment cylinder 15, and the left side frame attachment / detachment cylinder 15 expands and contracts.

The directional control valve 30 and the right side frame attachment / detachment cylinder 16 are connected via main pipelines 30A and 30B. The directional control valve 30 is switched from the neutral position to the switching position (m) or (n) according to the pilot signal from the jack-up controller 33. As a result, pressure oil is supplied to the bottom side oil chamber 16C or the rod side oil chamber 16D of the right side frame attachment / detachment cylinder 16, and the right side frame attachment / detachment cylinder 16 expands and contracts.

The variable relief valve 31 is provided between the traveling body side supply line 20B and the traveling body side return line 24B. The variable relief valve 31 sets the discharge pressure of the pressure oil discharged from the hydraulic pump 19 to the supply pipe line 20 by selecting an appropriate value from the variable values in advance, and sets an excess pressure exceeding the set discharge pressure. It is discharged to the hydraulic oil tank 23 through the return pipe 24. The switching valve 32 is located upstream of the jack-up control valve 17 and is provided in the middle of the swivel body side supply line 20A and the swivel body side return line 24A. The switching valve 32 is composed of an electromagnetic pilot type directional control valve having four ports and two positions, and the electromagnetic pilot portion of the switching valve 32 is electrically connected to the jack-up controller 33. The switching valve 32 is switched to the switching position (p) by supplying a pilot signal from the jack-up controller 33, and the pressure oil from the hydraulic pump 19 flows into the swivel body side supply pipe line 20A.

The jack-up controller 33 remotely controls each of the jack-up cylinders 11 to 14 by being operated by an operator when performing the jack-up work of the center frame 5. The jack-up controller 33 includes, for example, a power switch 33A, jack-up cylinder switches 33B, 33C, 33D, 33E for operating the jack-up cylinders 11, 12, 13, 14 and left and right side frame attachment / detachment cylinders 15, 16. It has removable cylinder switches 33F, 33G, etc. for operating.

Then, by turning on the power switch 33A of the jack-up controller 33, the switching valve 32 is switched to the switching position (p), and the pressure oil from the hydraulic pump 19 is supplied to the swivel body side supply line 20A and the traveling body side supply line. It is supplied to the jack-up control valve 17 through 20B. In this state, by operating the jack-up cylinder switches 33B, 33C, 33D, 33E of the jack-up controller 33, the jack-up cylinders 11, 12, 13, 14 are operated via the directional control valves 25, 26, 27, 28. Pressure oil is supplied to the jack-up cylinders 11, 12, 13, and 14 can be selectively expanded and contracted. Further, by operating the attachment / detachment cylinder switches 33F and 33G of the jack-up controller 33, pressure oil is supplied / discharged to the side frame attachment / detachment cylinders 15 and 16 via the directional control valves 29 and 30, and the side frame attachment / detachment cylinders 15 are supplied and discharged. , 16 can be selectively expanded and contracted.

As shown in FIGS. 1 and 2, the upper swivel body 34 is rotatably mounted on the lower traveling body 2 via the swivel wheel 3. The upper swivel body 34 has a swivel frame 35 forming a support structure, and a cab 36 forming a driver's cab is provided on the left front side of the swivel frame 35. Inside the cab 36, a driver's seat, an operation lever for work, an operation lever / pedal for traveling (none of which are shown) and the like are provided. The operator sits in the driver's seat and operates the operation lever for work and the operation lever / pedal for travel to perform the traveling operation by the lower traveling body 2, the turning operation of the upper rotating body 34, and the dismantling work by the front device 61. And so on.

On the other hand, on the rear end side of the swivel frame 35, a counterweight 37 for balancing the weight with the front device 61 is provided. An engine 18, a hydraulic pump 19, a control valve 21, a hydraulic oil tank 23, and the like driven by the engine 18 are provided on the front side of the counterweight 37. The engine 18, the hydraulic pump 19, the control valve 21, and the like are covered with an exterior cover 38.

Here, a door 39 that can be opened and closed is provided on the lower side of the exterior cover 38, and as shown in FIG. 6, a supply pipe connection port 40 and a return pipe connection port 41 are inside the door 39. And the cable connector 42 are provided side by side. The supply pipeline connection port 40 is connected to the swivel body side supply pipeline 20A arranged on the upper swivel body 34 side of the supply pipeline 20. The return pipe connection port 41 is connected to the swivel body side return pipe 24A arranged on the upper swivel body 34 side of the return pipe 24 (see FIG. 8).

As shown in FIGS. 5 and 8, one end of the supply line connecting hose 43 forming a part of the swivel side supply line 20A is connected to the supply line connecting port 40, and the supply line connecting hose 43 is connected. The other end is connected to the supply side coupler 50 of the connection device 45 described later. One end of the return line connecting hose 44 forming a part of the swivel side return line 24A is connected to the return line connecting port 41, and the other end of the return line connecting hose 44 is a connecting device 45 described later. It is connected to the return side coupler 51. On the other hand, the signal cable 33H extending from the jack-up controller 33 is connected to the cable connector 42. The cable connector 42 is electrically connected to the electromagnetic pilot portion of the switching valve 32, and the jack-up controller 33 is electrically connected to the electromagnetic pilot portion of the switching valve 32 via the signal cable 33H.

Therefore, when the power switch 33A of the jack-up controller 33 is turned on, the switching valve 32 is switched to the switching position (p). As a result, the pressure oil discharged from the hydraulic pump 19 is jacked up through the swivel side supply line 20A, the supply line connection hose 43, the connection device 45 (supply side coupler 50), and the traveling body side supply line 20B. Is supplied to. On the other hand, the return oil from the jack-up control valve 17 is supplied to the hydraulic oil tank 23 through the traveling body side return pipe 24B, the connecting device 45 (return side coupler 51), the return pipe connection hose 44, and the swivel side return pipe 24A. It is discharged.

Next, intervening in the middle of the supply line 20 and the return line 24, between the swivel side supply line 20A (supply line connection hose 43) and the traveling body side supply line 20B, and the swivel side return line 24A. The connection device 45 for connecting (return pipe connection hose 44) and the traveling body side return pipe 24B will be described.

As shown in FIG. 3, the connecting device 45 is located between the left front rotating arm 5A and the right front rotating arm 5B and between the left rear rotating arm 5C and the right rear rotating arm 5D in the center frame 5. Two are provided, one for each. These two connecting devices 45 have the same configuration and function, and the connecting devices 45 are used properly according to the work situation, and are used between the swivel body side supply pipe 20A and the traveling body side supply pipe 20B, and The return line 24A on the revolving structure side and the return line 24B on the traveling body side are connected to each other.

As shown in FIGS. 9 to 13, the connecting device 45 includes a pedestal 46, which will be described later, a connecting jig 48, and a attachment / detachment procedure limiter 52.

The pedestal 46 is attached to the center frame 5. The pedestal 46 is composed of a frame body bent in an inverted U shape, and is detachably attached to the upper surface of the center frame 5 by using a plurality of bolts 47 on both sides in the length direction. A connecting jig 48 is attached to the upper surface 46A of the pedestal 46 via a bracket 53 described later.

The connection jig 48 is arranged on the upper surface 46A of the pedestal 46 via the bracket 53, and is attached to the pedestal 46 by using bolts 49. The connecting jig 48 has a rectangular parallelepiped block shape, and the traveling body side supply pipe line 20B and the traveling body side return pipe line 24B are connected side by side in the longitudinal direction to one end 48A side in the width direction of the connecting jig 48. There is. On the other end 48B side of the connecting jig 48 in the width direction, a supply side coupler 50 communicating with the traveling body side supply pipe 20B and a return side coupler 51 communicating with the traveling body side return pipe 24B are arranged in the longitudinal direction. It is connected. Therefore, the swivel body side supply pipe 20A and the traveling body side supply pipe 20B are connected by connecting the base 43A of the supply pipe connection hose 43 constituting the swivel body side supply pipe 20A to the supply side coupler 50. .. Further, by connecting the base 44A of the return pipe connecting hose 44 constituting the swivel body side return pipe 24A to the return side coupler 51, the swivel body side return pipe 24A and the traveling body side return pipe 24B are connected. ..

The attachment / detachment procedure limiter 52 limits the attachment / detachment procedure of the pipeline. The attachment / detachment procedure limiter 52 is provided on the pedestal 46, the supply line connecting hose 43, and the return line connecting hose 44. The attachment / detachment procedure limiter 52 can attach / detach the supply pipe connection hose 43 to / from the supply side coupler 50 of the connection jig 48 with the return pipe connection hose 44 attached to the return side coupler 51 of the connection jig 48. Is to be. The attachment / detachment procedure limiter 52 is composed of a bracket 53, a hinge member 54, a cover member 55, a torsion spring 56, a protrusion 57, a flange 58 for a supply line, and a flange 59 for a return line, which will be described later.

The bracket 53 is provided between the pedestal 46 and the connecting jig 48. The bracket 53 is composed of a flat plate-shaped mounting base 53A sandwiched between the upper surface 46A of the pedestal 46 and the connecting jig 48, and a standing plate 53B erected on the mounting base 53A. The mounting base 53A is composed of a rectangular plate having a length dimension larger than the width dimension of the pedestal 46, and extends along the lower side of the supply side coupler 50 and the return side coupler 51 mounted on the connection jig 48. ing. The standing plate 53B is arranged between the supply side coupler 50 and the return side coupler 51, and the fixing piece 54A of the hinge member 54 is attached to the standing plate 53B.

The hinge member 54 is provided between the standing plate 53B of the bracket 53 and the cover member 55, and rotatably supports the cover member 55 with respect to the standing plate 53B. The hinge member 54 rotates horizontally about the fixed piece 54A fixed to the standing plate 53B, the shaft body 54B attached to the fixed piece 54A and extending upward and downward, and the shaft body 54B with respect to the fixed piece 54A. It has a rotating piece 54C that has become possible. The shaft body 54B of the hinge member 54 is arranged between the supply side coupler 50 and the return side coupler 51, and the cover member 55 is attached to the rotating piece 54C of the hinge member 54.

The cover member 55 is attached to the rotating piece 54C of the hinge member 54 on the attachment base 53A of the bracket 53. That is, the cover member 55 has a shaft body 54B of the hinge member 54 that serves as a rotation fulcrum between the supply side coupler 50 and the return side coupler 51. The cover member 55 is composed of a quadrangular plate body that can cover the opening end 50A of the supply side coupler 50, and the opening end 50A of the supply side coupler 50 and the supply pipeline with the shaft body 54B of the hinge member 54 as a rotation fulcrum. It is rotatably displaced between the base 43A of the connection hose 43 and the closed position shown in FIG. 11 and the open position shown in FIG. When the cover member 55 is in the closed position, the opening end 50A of the supply side coupler 50 is covered by the cover member 55, and the supply line connection hose 43 cannot be connected to the supply side coupler 50 by the cover member 55. It has become. On the other hand, when the cover member 55 is in the open position, the open end 50A of the supply side coupler 50 is opened, and the supply line connection hose 43 can be connected to the supply side coupler 50. Here, the cover member 55 has a protrusion contact surface 55A that projects toward the return side coupler 51 with reference to the position of the shaft body 54B of the hinge member 54, and the protrusion 57 contacts the protrusion contact surface 55A. As a result, the cover member 55 rotates from the closed position to the open position.

The torsion spring 56 is provided between the fixing piece 54A and the rotating piece 54C of the hinge member 54. The torsion spring 56 is inserted into, for example, the shaft body 54B of the hinge member 54, one end of which is locked to the fixing piece 54A, and the other end of which is locked to the rotating piece 54C. As a result, the cover member 55 attached to the rotating piece 54C of the hinge member 54 is always urged toward the closed position with the shaft body 54B of the hinge member 54 as the center.

The protrusion 57 is provided on the return pipe connecting hose 44 that constitutes the swivel side return pipe 24A. That is, the protrusion 57 is projected from the outer peripheral surface of the base 44A of the return pipe connection hose 44 at a position corresponding to the shaft body 54B of the hinge member 54 which is the rotation fulcrum of the cover member 55. As shown in FIGS. 11 and 12, when the base 44A of the return pipeline connecting hose 44 is connected to the opening end 51A of the return side coupler 51, the protrusion 57 comes into contact with the protrusion contact surface 55A of the cover member 55. By pressing this, the cover member 55 can rotate from the closed position to the open position using the shaft body 54B of the hinge member 54 as a rotation fulcrum. Therefore, when the return line connecting hose 44 is connected to the return side coupler 51, the cover member 55 is in the open position. Therefore, as shown in FIG. 13, the supply line connecting hose 43 is connected to the supply side coupler 50. be able to.

The supply pipeline flange 58 is provided in the vicinity of the base 43A of the supply pipeline connection hose 43. The supply pipeline flange 58 is formed as a disk concentric with the supply pipeline connecting hose 43. The return pipeline flange 59 is provided in the vicinity of the base 44A of the return pipeline connection hose 44. The return pipeline flange 59 is formed as a disk concentric with the return pipeline connecting hose 44. Here, as shown in FIG. 13, with the return line connecting hose 44 connected to the return side coupler 51 and the supply line connecting hose 43 connected to the supply side coupler 50, the return line flange 59 The configuration is such that it overlaps with the supply pipeline flange 58 in the axial direction (connection direction of the return pipeline connection hose 44) and is arranged on the bracket 53 side (connection jig 48 side) of the supply pipeline flange 58. It has become.

Therefore, in a state where the return pipeline connection hose 44 is connected to the return side coupler 51 and the supply pipeline connection hose 43 is connected to the supply side coupler 50, the return pipeline connection hose 44 is first taken from the return side coupler 51. Even if it is attempted to be removed, the return line connecting hose 44 cannot be removed because the return line flange 59 comes into contact with the supply line flange 58. In this way, when the return line connecting hose 44 is connected to the return side coupler 51 and the supply line connecting hose 43 is connected to the supply side coupler 50, the supply line connecting hose 43 is removed from the supply side coupler 50. The return pipeline connection hose 44 cannot be removed from the return coupler 51 until after the hose.

As shown in FIGS. 5 and 7, a cable connector 60 is attached to the pedestal 46 of the connecting device 45. A signal cable 33J extending from the jack-up controller 33 is connected to the cable connector 60. The cable connector 60 is electrically connected to the electromagnetic pilot portions of the directional control valves 25 to 30 constituting the jack-up control valve 17, and the jack-up controller 33 is a directional control valve via the signal cable 33J. It is electrically connected to 25 to 30 electromagnetic pilot sections.

As shown in FIG. 1, the front device 61 is provided on the front side of the upper swing body 34 so as to be able to move up and down. The front device 61 includes a boom 62 including a lower boom 62A, an intermediate boom 62B, and an upper boom 62C, a middle arm 63, an arm 64, and a crusher 65 as a work tool. The lower boom 62A is rotatably attached to the front side of the swivel frame 35. The middle arm 63 is rotatably attached to the tip of the upper boom 62C. The arm 64 is rotatably attached to the tip of the middle arm 63. The crusher 65 is rotatably attached to the tip of the arm 64.

A boom cylinder 66 is provided between the swivel frame 35 and the lower boom 62A. A first arm cylinder 67 is provided between the upper boom 62C and the middle arm 63. A second arm cylinder 68 is provided between the middle arm 63 and the arm 64. A work tool cylinder 69 is provided between the arm 64 and the crusher 65. The front device 61 expands and contracts each cylinder 66, 67, 68, 69 to rotate the boom 62, middle arm 63, arm 64, and crusher 65, and uses the crusher 65 to dismantle a high-rise building. Do.

The dismantling hydraulic excavator 1 according to the embodiment has the above-described configuration, and has a machine weight of, for example, about 45 to 100 tons. Therefore, when transporting the dismantling hydraulic excavator 1 to the work site, for example, the dismantling hydraulic excavator 1 is attached to a front device 61, a counterweight 37, and an upper swing body 34 from which the counterweight 37 is removed. The frame 5 is divided into left and right side frames 6 and 7 to which the driving wheels 8, the floating wheels 9 and the crawler belt 10 are attached, and these plurality of divided bodies are individually loaded on the trailer and transported to the work site. .. Each of the individually transported parts is assembled as a dismantling hydraulic excavator 1 at the work site.

Here, the center frame 5 to which the upper swing body 34 is attached is transported to the work site by a trailer and then lifted from the ground by using the jack-up cylinders 11 to 14, so that a hydraulic crane or the like is not used. It can be removed from the trailer. Therefore, the work of lowering the center frame 5 to which the upper swing body 34 is attached from the trailer will be described.

As shown in FIG. 14, the center frame 5 to which the upper swing body 34 is attached is transported to the work site in a state of being loaded on the loading platform of the trailer 70.

In this state, as shown in FIG. 3, the left front rotation arm 5A, the right front rotation arm 5B, the left rear rotation arm 5C, and the right rear rotation arm 5D of the center frame 5 are rotated to the jack-up position. As a result, the lower ends of the jack-up cylinders 11 to 14 provided on the rotating arms 5A to 5D face the ground, and the float 71 is arranged between the lower ends of the jack-up cylinders 11 to 14 and the ground (FIG. FIG. 14).

Next, as shown in FIG. 6, the door 39 provided on the outer cover 38 of the upper swivel body 34 is opened to expose the supply line connection port 40, the return line connection port 41, and the cable connector 42. Then, as shown in FIG. 5, one end of the return pipeline connection hose 44 is connected to the return pipeline connection port 41, and the other end of the return pipeline connection hose 44 is connected to the connection device 45 provided in the center frame 5. Connect to the return side coupler 51. Further, one end of the supply line connecting hose 43 is connected to the supply line connecting port 40, and the other end of the supply line connecting hose 43 is connected to the supply side coupler 50 of the connecting device 45 provided in the center frame 5. .. Further, the signal cable 33H of the jack-up controller 33 is connected to the cable connector 42, and the signal cable 33J is connected to the cable connector 60 of the connecting device 45.

Next, the hydraulic pump 19 is driven by the engine 18 and the power switch 33A of the jack-up controller 33 is turned on. As a result, the switching valve 32 is switched to the switching position (p), and the pressure oil discharged from the hydraulic pump 19 is the swivel body side supply line 20A, the supply line connection hose 43, the connection device 45, and the traveling body side supply line 20B. It is supplied to the jack-up control valve 17 through. In this state, by operating the jack-up cylinder switches 33B, 33C, 33D, 33E of the jack-up controller 33, the jack-up cylinders 11, 12, 13, 14 are operated via the directional control valves 25, 26, 27, 28. Pressure oil is supplied to the jack-up cylinders 11 to 14 to expand and contract individually. Further, the pressure oil discharged from each of the jack-up cylinders 11 to 14 is discharged to the hydraulic oil tank 23 through the traveling body side return pipe 24B, the connecting device 45, the return pipe connecting hose 44, and the swivel side return pipe 24A. ..

In this way, by appropriately extending the four jack-up cylinders 11 to 14 while keeping the center frame 5 horizontal, as shown in FIG. 15, the center frame 5 to which the upper swing body 34 is attached is attached. It can be lifted from the loading platform of the trailer 70. By advancing the trailer 70 in this state, the center frame 5 to which the upper swing body 34 is attached can be lowered from the trailer 70 without using a hydraulic crane or the like.

In this way, after the center frame 5 to which the upper swing body 34 is attached is lowered from the trailer 70, the drive wheels 8 and the idle wheels 9 are held in a state where the center frame 5 is lifted by the jack-up cylinders 11 to 14. The left and right side frames 6 and 7 to which the tracks 10 are attached are attached to the center frame 5 (side frame attachment work).

When the side frame is attached, the left side frame 6 to which the drive wheels 8, the floating wheels 9, and the tracks 10 are attached is lifted by using a hydraulic crane or the like. Then, the left front overhang beam 5E and the left rear overhang beam 5F of the center frame 5 shown in FIG. 3 and the front bracket 6A and the rear bracket 6B of the left side frame 6 are opposed to each other, and the left side frame is opposed to the center frame 5. Position 6. In this state, the detachable cylinder switch 33F of the jack-up controller 33 is operated to extend the left side frame detachable cylinder 15. As a result, the left front overhang beam 5E of the center frame 5 and the front bracket 6A of the left side frame 6 are connected by the connecting pin 15A, and the left rear overhang beam 5F of the center frame 5 and the rear bracket of the left side frame 6 are connected. The left side frame 6 can be attached to the center frame 5 by being connected to the 6B by the connecting pin 15B.

Similarly, the right side frame attachment / detachment cylinder 16 in a state where the right side frame 7 to which the drive wheels 8, the floating wheels 9 and the crawler belts 10 are attached is lifted by a hydraulic crane or the like and positioned with respect to the center frame 5. To stretch. As a result, the right front overhang beam 5G of the center frame 5 and the front bracket 7A of the right side frame 7 are connected by the connecting pin 16A, and the right rear overhang beam 5H of the center frame 5 and the rear bracket of the right side frame 7 are connected. The right side frame 7 can be attached to the center frame 5 by being connected to the center frame 5 by the connecting pin 16B.

In this way, after the left and right side frames 6 and 7 are attached to the center frame 5, the jack-up controllers 33 reduce the jack-up cylinders 11 to 14 to the left and right side frames 6 and 7. The attached track 10 is grounded on the ground. Then, each of the rotating arms 5A to 5D of the center frame 5 is rotated from the jack-up position to the storage position and held at the storage position.

Next, with the drive of the hydraulic pump 19 stopped by the engine 18, the supply line connecting hose 43 is removed from the supply side coupler 50 of the connecting device 45 and the supply line connecting port 40 on the upper swing body 34 side. Further, the return pipe connecting hose 44 is removed from the return coupler 51 of the connecting device 45 and the return pipe connecting port 41 on the upper swing body 34 side. Further, the signal cable 33H of the jack-up controller 33 is removed from the cable connector 42 on the upper swing body 34 side, and the signal cable 33J is removed from the cable connector 60 of the connecting device 45.

In this way, the jack-up work when lowering the center frame 5 to which the upper swing body 34 is attached from the trailer 70 and the side frames for attaching the left and right side frames 6 and 7 to the center frame 5 lowered from the trailer 70. The installation work is completed.

In the embodiment, by providing the connection device 45 with the attachment / detachment procedure limiter 52, the supply line connection hose 43 and the return line connection hose 44 are attached / detached to / from the supply side coupler 50 and the return side coupler 51 of the connection device 45. The procedure for doing so is restricted. That is, after connecting the return line connecting hose 44 to the return side coupler 51 of the connecting device 45, the supply line connecting hose 43 can be connected to the supply side coupler 50 of the connecting device 45, and the supply line After removing the connection hose 43 from the supply side coupler 50 of the connection device 45, the return pipe connection hose 44 can be removed from the return side coupler 51 of the connection device 45 and supplied to the jack-up control valve 17. The pressure oil produced can be discharged to the hydraulic oil tank 23 through the return pipe 24.

Therefore, FIGS. 9 to 13 show the action of the attachment / detachment procedure limiter 52 for limiting the attachment / detachment procedure of the supply line connection hose 43 and the return line connection hose 44 to the supply side coupler 50 and the return side coupler 51 of the connecting device 45. Will be explained with reference to.

As shown in FIGS. 9 and 11, when the supply line connecting hose 43 and the return line connecting hose 44 are not connected to the supply side coupler 50 and the return side coupler 51 of the connecting device 45, the attachment / detachment procedure is restricted. The cover member 55 of the tool 52 holds the closed position by the spring force of the torsion spring 56. As a result, the opening end 50A of the supply side coupler 50 is covered with the cover member 55, so that the base 43A of the supply pipeline connection hose 43 cannot be connected to the opening end 50A of the supply side coupler 50.

On the other hand, since the opening end 51A of the return side coupler 51 of the connecting device 45 is open, the operator first connects the base 44A of the return pipe connection hose 44 to the opening end 51A of the return side coupler 51. At this time, the protrusion 57 provided on the base 44A of the return pipe connecting hose 44 comes into contact with the protrusion contact surface 55A of the cover member 55 and presses the protrusion 57A. As a result, as shown in FIG. 12, the cover member 55 rotates from the closed position to the open position with the shaft body 54B of the hinge member 54 as the rotation fulcrum.

Therefore, since the opening end 50A of the supply side coupler 50 is opened, the mouthpiece 43A of the supply pipeline connection hose 43 can be connected to the opening end 50A of the supply side coupler 50. In this way, before the return pipeline connecting hose 44 is connected to the return side coupler 51 of the connecting device 45, the opening end 50A of the supply side coupler 50 is closed by the cover member 55 of the attachment / detachment procedure limiter 52. Therefore, it is possible to reliably prevent only the supply line connecting hose 43 from being connected to the supply side coupler 50 of the connecting device 45 before the return line connecting hose 44.

On the other hand, a supply pipeline flange 58 is provided in the vicinity of the base 43A of the supply pipeline connection hose 43, and a return pipeline flange 59 is provided in the vicinity of the base 44A of the return pipeline connection hose 44. There is. As shown in FIGS. 10 and 13, when the return line connecting hose 44 is connected to the return side coupler 51 and the supply line connecting hose 43 is connected to the supply side coupler 50, the return line flange 59 is connected. , It overlaps with the supply pipeline flange 58 in the axial direction (connection direction of the return pipeline connection hose 44), and is arranged on the bracket 53 side (connection jig 48 side) of the supply pipeline flange 58.

Therefore, even if the return pipeline connection hose 44 is to be removed from the return coupler 51 before the supply pipeline connection hose 43, the return pipeline flange 59 comes into contact with the supply pipeline flange 58. , The return line connecting hose 44 cannot be removed. In this way, by providing the supply pipeline connecting hose 43 with the supply pipeline flange 58 and providing the return pipeline connecting hose 44 with the return pipeline flange 59, the return pipe is provided before the supply pipeline connecting hose 43. It is possible to reliably prevent the road connection hose 44 from being removed from the return side coupler 51.

Therefore, while the supply line connecting hose 43 is connected to the supply side coupler 50 of the connecting device 45, the state in which the return line connecting hose 44 is connected to the return side coupler 51 can be maintained. As a result, it is possible to avoid a state in which the pressure oil supplied to the jack-up control valve 17 through the supply line 20 is not discharged to the hydraulic oil tank 23 through the return line 24, and the pressure in the supply line 20 can be avoided. Can be kept below the set pressure set by the variable relief valve 31, so that the hydraulic equipment such as the jack-up control valve 17 can be protected.

Thus, in the dismantling hydraulic excavator 1 according to the embodiment, the center frame 5 of the lower traveling body 2 is connected to the four jack-up cylinders 11 to 14 and the hydraulic pump 19, and the hydraulic oil to the jack-up cylinders 11 to 14 is connected. The jack-up control valve 17 that controls the above, the supply side coupler 50 interposed in the supply line 20 that connects the hydraulic pump 19 and the jack-up control valve 17, the jack-up control valve 17, and the hydraulic oil tank 23 are connected. It has a connecting device 45 provided with a return side coupler 51 interposed in the return line 24, and the connection device 45 attaches the return line 24 (return line connection hose 44) to the return coupler 51. In this state, the attachment / detachment procedure limiter 52 that allows the supply line 20 (supply line connection hose 43) to be attached / detached to / from the supply side coupler 50 is provided.

As a result, the attachment / detachment procedure limiter 52 makes it possible to connect the supply line connection hose 43 to the supply side coupler 50 after connecting the return line connection hose 44 to the return side coupler 51, and also to connect the supply side coupler. After removing the supply line connecting hose 43 from 50, it is possible to remove the return line connecting hose 44 from the return side coupler 51. Therefore, when the supply line connecting hose 43 is attached to the supply side coupler 50, the return line connecting hose 44 is attached to the return side coupler 51, so that the pressure oil from the hydraulic pump 19 is returned to the return line 24. It can be discharged to the hydraulic oil tank 23 through. As a result, it is possible to suppress the generation of excessive pressure in the hydraulic circuits for the jack-up cylinders 11 to 14 and protect the hydraulic equipment such as the jack-up control valve 17.

According to the embodiment, the connecting device 45 is a connecting jig 48 in which a pedestal 46 attached to the center frame 5 and a supply side coupler 50 and a return side coupler 51 provided on the pedestal 46 are arranged in parallel. The attachment / detachment procedure limiter 52 is located between the pedestal 46 and the connection jig 48, and extends along the lower side of the return side coupler 51 and the supply side coupler 50. A rotation fulcrum (shaft 54B of the hinge member 54) is provided between the bracket 53 and the return side coupler 51 and the supply side coupler 50 provided on the bracket 53, and the supply side coupler 50 and the supply line connecting hose 43 are provided. A cover member 55 that can rotate between a closed position and an open position, and a return pipeline connecting hose 44 provided at a position corresponding to a rotation fulcrum of the cover member 55, are provided on the return pipeline connecting hose 44. It is composed of a protrusion 57 that rotates the cover member 55 from the closed position to the open position when connected to.

As a result, when the return line connecting hose 44 is not connected to the return side coupler 51 of the connecting device 45, the supply side coupler 50 is blocked by the cover member 55, so that the supply line connecting hose 43 is connected to the supply side coupler. It cannot be connected to 50. As a result, the pressure oil supplied from the hydraulic pump 19 to the jack-up control valve 17 through the supply pipe line 20 can be discharged to the hydraulic oil tank 23 through the return pipe line 24, and the jack-up control valve 17 and the like can be discharged. It can protect hydraulic equipment.

According to the embodiment, the attachment / detachment procedure limiter 52 has a return pipeline flange 59 provided on the return pipeline connection hose 44 and a supply pipeline flange 58 provided on the supply pipeline connection hose 43. With the return line connecting hose 44 connected to the return side coupler 51 and the supply line connecting hose 43 connected to the supply side coupler 50, the return line flange 59 is attached to the supply line flange 58. They are arranged on the bracket 53 side of the supply pipeline flange 58 so as to overlap each other.

As a result, even if the return pipeline connection hose 44 is to be removed from the return coupler 51 before the supply pipeline connection hose 43, the return pipeline flange 59 comes into contact with the supply pipeline flange 58. , The return line connecting hose 44 cannot be removed. Therefore, the return line connection hose 44 was removed from the return side coupler 51 before the supply line connection hose 43, and only the supply line connection hose 43 was connected to the supply side coupler 50 of the connecting device 45. It is possible to surely prevent the state from occurring. As a result, it is possible to avoid a state in which the pressure oil supplied to the jack-up control valve 17 through the supply line 20 is not discharged to the hydraulic oil tank 23 through the return line 24, and the jack-up control valve 17 and the like can be avoided. Can protect hydraulic equipment.

In the above-described embodiment, the swivel side supply pipe 20A is provided between the supply pipe connection port 40 provided on the upper swivel body 34 side and the supply side coupler 50 of the connecting device 45 provided on the center frame 5. An example shows a case where the connection is made via the constituent supply line connection hose 43. However, the present invention is not limited to this, and for example, the supply pipe connection hose 43 may be abolished and the tip of the swivel side supply pipe 20A may be directly connected to the supply side coupler 50. Similarly, for example, the return pipe connecting hose 44 may be abolished, and the tip of the swivel side return pipe 24A may be directly connected to the return coupler 51.

Further, in the above-described embodiment, the hinge member 54 is provided between the cover member 55 constituting the attachment / detachment procedure limiter 52 and the standing plate 53B of the bracket 53, and the cover member 55 uses the shaft body 54B of the hinge member 54. An example shows a case where the rotation fulcrum is rotated between the closed position and the open position. However, the present invention is not limited to this, and for example, a shaft body extending in the upward and downward directions may be erected on the mounting base 53A of the bracket 53, and the cover member may be rotatably supported by the shaft body.

Further, in the above-described embodiment, a case where two connecting devices 45 are provided in the center frame 5 of the lower traveling body 2 is illustrated. However, the present invention is not limited to this, and for example, one or three or more connecting devices 45 may be provided.

In the above-described embodiment, the dismantling hydraulic excavator 1 used for the dismantling work of a high-rise building will be described as an example. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator for excavation work provided with a bucket. Further, it can be widely applied not only to hydraulic excavators but also to large construction machines such as hydraulic cranes.

1 Hydraulic excavator for dismantling (construction machinery)
2 Lower vehicle 5 Center frame 6 Left side frame 7 Right side frame 11 Left front jack-up cylinder 12 Right front jack-up cylinder 13 Left rear jack-up cylinder 14 Right rear jack-up cylinder 17 Jack-up control valve 18 Engine 19 Hydraulic pump 20 Supply Pipeline 23 Hydraulic oil tank 24 Return pipeline 34 Upper swivel body 35 Swing frame 43 Supply pipeline connection hose (supply pipeline)
44 Return line connection hose (return line)
45 Connection device 46 Pedestal 48 Connection jig 50 Supply side coupler 51 Return side coupler 52 Detachment procedure limiter 53 Bracket 54B Shaft body (rotation fulcrum)
55 Cover member 57 Protrusion 58 Supply pipeline flange 59 Return pipeline flange

Claims (2)

A self-propelled lower traveling body and an upper rotating body rotatably mounted on the lower traveling body are provided.
The lower traveling body has a center frame that supports the upper rotating body, and left and right side frames that are located on both the left and right sides of the center frame and extend in the front and rear directions.
The upper swivel body is an operation of storing a swivel frame forming a support structure, an engine mounted on the swivel frame, a hydraulic pump driven by the engine, and hydraulic oil supplied to the hydraulic pump. Has an oil tank and
The center frame of the lower traveling body
Four jack-up cylinders provided apart from each other in the front, rear, left, and right directions in order to lift the lower traveling body and the upper rotating body from the ground.
A jack-up control valve connected to the hydraulic pump to control hydraulic oil to the jack-up cylinder, and a supply-side coupler and the jack interposed in a supply line connecting the hydraulic pump and the jack-up control valve. In a construction machine having a control valve for up and a connecting device provided with a return side coupler interposed in a return line connecting the hydraulic oil tank.
The connecting device makes it possible to connect the supply line to the supply side coupler after connecting the return line to the return side coupler , and removes the supply line from the supply side coupler. A attachment / detachment procedure limiter that allows the return line to be later removed from the return coupler is provided .
The connecting device includes a pedestal attached to the center frame, a connecting jig provided on the pedestal in which the supply side coupler and the return side coupler are arranged in parallel, and the attachment / detachment procedure limiter. Further prepare
The attachment / detachment procedure limiter is
A bracket located between the pedestal and the connecting jig and extending along the lower side of the return side coupler and the supply side coupler.
A cover member provided on the bracket and having a rotation fulcrum between the return side coupler and the supply side coupler and rotatable between a closed position and an open position between the supply side coupler and the supply pipe line. When,
The cover member is provided in the return line at a position corresponding to the rotation fulcrum of the cover member, and when the return line is connected to the return side coupler, the cover member is rotated from the closed position to the open position. A construction machine characterized by being composed of protrusions . The attachment / detachment procedure limiter has a return pipeline flange provided in the return pipeline and a supply pipeline flange provided in the supply pipeline.
In a state where the return line is connected to the return coupler and the supply line is connected to the supply side coupler, the return line flange overlaps the supply line flange. The construction machine according to claim 1 , wherein the construction machine is arranged on the bracket side of the flange.

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