JP6908565B2 - Construction machinery - Google Patents

Description

The present invention relates to a construction machine provided with a hydraulic actuator provided on the tip end side of a telescopic arm and a hose reel around which a hydraulic hose connected to the hydraulic actuator is wound.

The inner wall of a blast furnace for reducing and melting iron ore to produce pig iron is covered with refractory bricks. Since the refractory bricks are gradually melted, the blast furnace needs to be regularly repaired to replace the refractory bricks with the fire in the furnace turned off. When repairing a blast furnace, the melted refractory bricks are crushed and peeled off from the inner wall of the blast furnace, so a construction machine (demolition work machine) equipped with a breaker (crusher) used for rock drilling work is preferable. Used.

Here, the dismantling work machine used for the repair work of the blast furnace is composed of a self-propelled car body and a work device provided on the car body. A tubular base cylinder extending in the direction, a tubular arm provided inside the base cylinder so as to be movable in the length direction, and one side in the length direction accommodated in the outer arm so as to be movable in the length direction. It is configured to include an inner arm whose other side in the length direction protrudes to the outside of the outer arm, and a breaker rotatably provided on the other side in the length direction of the inner arm.

In this case, since the blast furnace is not provided with an opening large enough for the vehicle body of the demolition work machine to pass through, normally, with the vehicle body stopped outside the blast furnace, only the working equipment is passed through the opening inside the blast furnace. The refractory bricks provided on the inner wall of the blast furnace are crushed using a breaker.

For example, when crushing refractory bricks installed in the inner part of a blast furnace, the inner arm is extended from the outer arm with the base cylinder tilted and raised with respect to the vehicle body, and the breaker provided on the inner arm is used to prevent fire. Crush the bricks. At this time, by rotating the outer arm holding the inner arm with respect to the base cylinder and rotating (swinging) the breaker with respect to the inner arm, the upper surface, lower surface, front surface, rear surface, left, and right of the blast furnace are used. All refractory bricks provided on the inner wall of the side surface can be crushed.

By the way, when the inner arm is expanded and contracted with respect to the outer arm to move the position of the breaker, it is necessary to suppress the slack of the hydraulic hose connected to the hydraulic cylinder that rotates the breaker. Therefore, a hose reel is provided on one side (vehicle body side) in the length direction of the outer arm, and the hydraulic hose is wound by this hose reel to suppress the slackening of the hydraulic hose due to the expansion and contraction operation of the inner arm. (See Patent Document 1).

JP-A-2017-82417

However, in the hose reel according to the prior art, a spiral spring is provided inside a cylindrical drum around which the hydraulic hose is wound, and the spiral spring constantly urges the drum in the winding direction to form a hydraulic hose. On the other hand, it is configured to always give tension in the winding direction. For this reason, the winding force acting on the hydraulic hose from the hose reel is not always sufficient, and the hydraulic hose loosens when the extended inner arm is contracted, and the structure provided inside the inner arm and the outer arm. There is a problem of contacting.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a construction machine capable of suppressing the loosening of a hydraulic hose and more reliably winding the hydraulic hose with a hose reel. I am aiming.

In order to solve the above-mentioned problems, the present invention comprises a self-propelled vehicle body having a driver's seat, a tubular base cylinder that is attached to the vehicle body so as to be able to move up and down and extends in the front and rear directions, and the inside of the base cylinder. A tubular arm provided so as to be movable in the length direction, a hydraulic actuator provided on the tip side of the arm, a hose reel rotatably provided on the arm, and the hydraulic actuator and the hydraulic source. A directional control valve provided in the middle of the main pipeline connecting the two to control the supply and discharge of pressure oil to the hydraulic actuator according to the pilot pressure, and a part of the main pipeline are wound around the hose reel. Applies to construction machines that are equipped with a hydraulic hose.

The features of the present invention are a pilot pipeline connecting the directional control valve and the pilot hydraulic source, and a pilot valve provided in the middle of the pilot pipeline to control the supply and discharge of pilot pressure to the directional control valve. The device, a gate lock lever that opens or shuts off the entrance / exit connected to the driver's seat, and the gate lock that is located between the pilot hydraulic source and the pilot valve device and is provided in the middle of the pilot pipeline. A gate lock valve that communicates with the pilot pipeline when the lever shuts off the entrance / exit, and a gate lock valve located downstream of the gate lock valve and connected to the pilot pipeline, and the gate lock lever is connected to the pilot pipeline. The hose reel is provided with a hydraulic motor that rotates the hose reel in the winding direction by supplying a pilot pressure when the hose reel is shut off.

According to the present invention, while the gate lock lever shuts off the entrance / exit, the pilot pressure from the pilot hydraulic source is supplied to the hydraulic motor, and the hose reel rotates in the winding direction. As a result, tension can always be applied to the hydraulic hose wound around the hose reel in the winding direction, suppressing the slackening of the hydraulic hose due to the expansion and contraction of the arm, and ensuring that the hydraulic hose is attached to the hose reel. Can be wound up.

It is a front view which shows the construction machine by embodiment of this invention. It is a front view which shows the state which repair work of a blast furnace is performed using the work equipment of a construction machine. It is sectional drawing which shows the inside of a working apparatus. It is an enlarged view of the main part which shows the hose reel, the support bracket and the like in FIG. It is an enlarged view of the main part which saw the hose reel, the support bracket, etc. from the direction of arrow VV in FIG. It is sectional drawing which saw the hose reel, the support bracket, etc. from the direction of arrow VI-VI in FIG. It is an enlarged view of the main part which shows the state which supported bracket, the hose reel, and the hydraulic motor are attached to the end edge part of the outer arm. FIG. 5 is an enlarged view of a main part showing a state in which a hydraulic hose is wound around a hose reel in FIG. FIG. 5 is an enlarged view of a main part showing a state in which a hydraulic hose is wound around a hose reel in FIG. It is a perspective view of a partial break which shows the inside of a cab. It is a hydraulic circuit diagram including a work tool cylinder, a telescopic cylinder, a breaker, a hydraulic motor and the like. It is a characteristic diagram which shows the relationship between the relief set pressure in a pilot line by a relief valve, and the set pressure in a motor pilot line by a pressure reducing valve.

Hereinafter, embodiments of the construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example a dismantling work machine provided with a breaker as a work tool.

The dismantling work machine 1 is used, for example, for repair work of a blast furnace. As shown in FIG. 2, the blast furnace 101 is composed of a hollow container having an opening 102, and the inner wall 103 of the blast furnace 101 is provided with refractory bricks 104 over the entire surface thereof. Since the refractory bricks 104 melt over time, the blast furnace 101 needs to perform repair work to replace the refractory bricks 104 on a regular basis. The dismantling work machine 1 is used.

The vehicle body of the dismantling work machine 1 is composed of a crawler-type lower traveling body 2 capable of self-propelling and an upper rotating body 3 mounted on the lower traveling body 2 so as to be swivelable. A work device 9 described later is provided on the front side of the upper swivel body 3.

The upper swivel body 3 is the weight of the swivel frame 4 as a base, the cab 5 provided on the left side of the front portion of the swivel frame 4 and defining the driver's cab, and the work device 9 provided on the rear end side of the swivel frame 4. It is located between the counterweight 6 for balancing and the cab 5 and the counterweight 6, and is provided on the swivel frame 4 to accommodate on-board equipment such as an engine and a heat exchange device (none of which are shown). It is configured to include the exterior cover 7.

Here, a pair of left and right work device brackets 4A that bulge upward in a chevron shape are integrally provided on the front side of the swivel frame 4, and each of these work device brackets 4A is used to attach the work device 9. The adapter 8 is attached (see FIG. 3). The adapter 8 constitutes a part of the swivel frame 4, and is a base cylinder mounting portion 8A to which the base end side of the base cylinder 10 described later is mounted, and a base cylinder cylinder 11 arranged on the front side of the base cylinder mounting portion 8A and described later. Is provided with a cylinder mounting portion 8B to which the

The working device 9 is attached to the working device bracket 4A of the swivel frame 4 constituting the upper swivel body 3 via the adapter 8. As shown in FIG. 3, the working device 9 includes a base cylinder 10, a base cylinder cylinder 11, an outer arm 13, an arm rotating device 15, an inner arm 17, a telescopic cylinder 18, a working tool 19, a working tool cylinder 20, and a support, which will be described later. It includes a bracket 21, a hose reel 26, a swivel joint 37, and the like.

The base cylinder 10 is attached to the adapter 8 which forms a part of the swivel frame 4 so as to be able to move up and down. The base cylinder 10 is formed of a cylindrical cylinder extending in the front and rear directions, and is open on both sides in the length direction (front and rear directions). That is, one side of the base cylinder 10 in the length direction (upper swivel body 3 side) has a base end side opening 10A, and the other side in the length direction has a tip end side opening 10B. On the outer peripheral side of the base end side opening 10A, a substantially disk-shaped base end side flange 10C serving as an end edge portion on one side in the length direction is provided, and each roller described later is provided on the base end side flange 10C. A member 14 is provided. A disk-shaped tip-side flange 10D is provided on the outer peripheral side near the tip-side opening 10B. On the lower surface side of the base cylinder 10, mounting brackets 10E extending in the front and rear directions over the entire length direction are provided. The rear side of the mounting bracket 10E is rotatably (depressed and raised) connected to the base cylinder mounting portion 8A of the adapter 8 by using the base cylinder support shaft 10F.

The base cylinder cylinder 11 is provided between the adapter 8 and the mounting bracket 10E of the base cylinder 10. The bottom side of the base cylinder cylinder 11 is connected to the cylinder mounting portion 8B of the adapter 8 by using the bottom side connecting pin 11A, and the rod side of the base cylinder cylinder 11 is connected to the base cylinder 10 by using the rod side connecting pin 11B. It is connected to the front side of the bracket 10E. Therefore, by expanding and contracting the base cylinder cylinder 11, the base cylinder 10 rotates upward and downward (downward and upward movement) about the base cylinder support shaft 10F.

The arm 12 is provided inside the base cylinder 10 so as to be movable in the length direction and to be rotatable. The arm 12 includes an outer arm 13 and an inner arm 17, which will be described later.

The outer arm 13 is formed of a hollow cylinder extending in the front and rear directions, and one side (base end side) in the length direction is rotatably housed inside the base cylinder 10. The other side (tip side) of the outer arm 13 in the length direction projects to the outside of the base cylinder 10 through the tip side opening 10B of the base cylinder 10. The base end side, which is one side in the length direction of the outer arm 13, becomes the base end side opening end 13A, and projects to the outside of the base cylinder 10 through the base end side opening 10A of the base cylinder 10. On the other hand, the other side in the length direction from the middle portion in the length direction of the outer arm 13 projects to the outside of the base cylinder 10 through the tip side opening 10B of the base cylinder 10 and becomes the other side in the length direction of the outer arm 13. The tip side is the tip side open end 13B.

On the outer peripheral side of the base end side opening end 13A, a large-diameter cylindrical base end side cylinder 13C serving as an end edge portion on one side in the length direction is integrally provided, and the base end side cylinder 13C is a base. It is adjacent to the base end side flange 10C of the cylinder 10 in the front and rear directions (see FIGS. 4 to 6). Further, a disk-shaped intermediate flange 13D located outside the base cylinder 10 is provided on the outer peripheral side of the intermediate portion in the length direction of the outer arm 13, and the intermediate flange 13D is on the tip end side of the base cylinder 10. It is adjacent to the flange 10D in the front and rear directions.

As shown in FIGS. 4 to 6, a plurality of (for example, eight) roller members 14 are provided on the base end side flange 10C of the base cylinder 10 at equal intervals in the circumferential direction. Each roller member 14 is composed of a support shaft 14A fastened to a base end side flange 10C and a cylindrical roller 14B rotatably supported by the support shaft 14A, and each roller 14B is a base of an outer arm 13. The base end side cylinder 13C provided on the end side is rotatably supported.

The arm rotating device 15 is provided on the tip end side of the base cylinder 10 and rotates the outer arm 13 with respect to the base cylinder 10. The arm rotating device 15 is provided between the front end side flange 10D of the base cylinder 10 and the intermediate flange 13D of the outer arm 13. The arm rotating device 15 includes a swivel wheel 15A that rotatably supports the outer arm 13 with respect to the base cylinder 10 and a swivel motor 15B that rotates the outer arm 13 supported by the swivel wheel 15A. ..

Therefore, the outer arm 13 is rotatably supported by each roller member 14 provided on the base end side flange 10C of the base cylinder 10 and a swivel wheel 15A provided between the tip end side flange 10D of the base cylinder 10. By operating the swivel motor 15B of the arm rotating device 15, the arm rotating device 15 is configured to rotate 360 ° (total swivel) with respect to the base cylinder 10.

An inner arm guide 16 is provided at the tip end side opening end 13B of the outer arm 13. The inner arm guide 16 includes a plurality of rollers 16A and the like. The inner arm guide 16 movably supports the inner arm 17 projecting outward from the tip end side opening end 13B of the outer arm 13 by each roller 16A or the like.

The inner arm 17 is composed of a hollow tubular body extending in the front and rear directions, and one side (base end side) in the length direction is provided inside the outer arm 13 so as to be movable in the length direction. The other side (tip side) of the inner arm 17 in the length direction projects to the outside of the outer arm 13 through the tip end side opening end 13B of the outer arm 13. The proximal end side, which is one side in the length direction of the inner arm 17, is the proximal end side opening end 17A, and the distal end side, which is the other side in the longitudinal direction of the inner arm 17, is the distal end side opening end 17B. Further, a work tool mounting bracket 17C for mounting the work tool 19, which will be described later, is projected from the tip of the inner arm 17.

A plurality of (for example, four) guide rollers 17D are provided on the outer peripheral side of the base end side opening end 17A. Each of these guide rollers 17D rolls along the inner peripheral surface of the outer arm 13 to support the base end side of the inner arm 17 so as to be movable in the length direction with respect to the outer arm 13. Therefore, the inner arm 17 is longer than the outer arm 13 by the guide rollers 17D provided at the base end side opening end 17A and the inner arm guide 16 provided at the tip end side opening end 13B of the outer arm 13. It is supported so that it can move in the direction.

The telescopic cylinder 18 is located inside the inner arm 17 and is provided between the outer arm 13 and the inner arm 17, and moves (expands and contracts) the inner arm 17 in the length direction with respect to the outer arm 13. The telescopic cylinder 18 is composed of a hydraulic cylinder, the bottom side of the telescopic cylinder 18 is connected to the middle portion in the length direction of the inner arm 17 by using the bottom side connecting pin 18A, and the rod side of the telescopic cylinder 18 is the rod side. It is connected to the base end side of the outer arm 13 by using the connecting pin 18B. Therefore, by expanding and contracting the telescopic cylinder 18, the inner arm 17 moves (expands and contracts) in the length direction with respect to the outer arm 13 while being supported by each guide roller 17D and the inner arm guide 16.

The work tool 19 is provided on the tip end side of the inner arm 17. The work tool 19 is composed of a holder 19B rotatably supported by a work tool mounting bracket 17C of the inner arm 17 using a support shaft 19A, and a breaker (crusher) 19C held by the holder 19B. The 19C constitutes a hydraulic actuator provided on the tip end side of the arm 12. The holder 19B is rotated upward and downward about the support shaft 19A by the work tool cylinder 20 described later. The breaker 19C vibrates at high speed when the pressure oil from the hydraulic pump 44, which will be described later, is supplied through the hydraulic hoses 52 and 53, and crushes the refractory bricks 104 provided on the inner wall 103 of the blast furnace 101.

The work tool cylinder 20 is provided between the inner arm 17 and the holder 19B of the work tool 19. The work tool cylinder 20 constitutes a hydraulic actuator provided on the tip end side of the arm 12 together with the breaker 19C of the work tool 19. The bottom side of the work tool cylinder 20 is connected to the intermediate portion in the length direction of the inner arm 17 by using the bottom side connecting pin 20A, and the rod side of the work tool cylinder 20 is connected to the work tool by using the rod side connecting pin 20B. It is connected to the holder 19B of 19. The work tool cylinder 20 rotates the holder 19B of the work tool 19 upward and downward with respect to the support shaft 19A by supplying the pressure oil from the hydraulic pump 44, which will be described later, through the hydraulic hoses 60 and 61 (neck). The breaker 19C is made to face a desired crushing target (refractory brick 104).

The support bracket 21 is attached to a base end side cylinder 13C which is an end edge portion on one side in the length direction of the outer arm 13. The support bracket 21 rotatably supports the hose reel 26 described later. Therefore, when the outer arm 13 is rotated with respect to the base cylinder 10 by the arm rotating device 15, the support bracket 21 and the hose reel 26 are configured to rotate together with the outer arm 13. The support bracket 21 includes a lower frame body 22, an upper frame body 23, a first shaft support plate 24, and a second shaft support plate 25, which will be described later.

The lower frame body 22 is attached to the end surface of the base end side cylinder 13C of the outer arm 13. As shown in FIG. 7, the lower frame body 22 is formed by two square tubular legs 22A and 22B extending in the front and rear directions and a connecting portion 22C connecting the legs 22A and 22B. It is formed in a U shape. Flat plate-shaped flanges 22D are provided on the base end side (base end side cylinder 13C side) of the legs 22A and 22B, and each flange 22D is fastened to the end face of the base end side cylinder 13C using bolts 22E. ing. A flat plate-shaped mounting plate 22F is fixed to the intermediate portion of each of the legs 22A and 22B in the length direction (see FIG. 4).

The upper frame body 23 is located above the lower frame body 22 and is attached to the end surface of the base end side cylinder 13C of the outer arm 13. The upper frame body 23 has the same shape as the lower frame body 22, and is formed in a U shape as a whole by the two leg portions 23A and 23B and the connecting portion 23C. Flange 23D is provided on the base end side of each of the legs 23A and 23B, and each flange 23D is fastened to the end face of the base end side cylinder 13C by using a bolt 23E. A mounting plate 23F is fixed to an intermediate portion in the length direction of each of the leg portions 23A and 23B.

The first shaft support plate 24 is provided between the leg portion 22A of the lower frame body 22 and the leg portion 23A of the upper frame body 23, and supports one end 27A of the support shaft 27 constituting the hose reel 26 described later. It is a thing. The first shaft support plate 24 includes a flat plate-shaped lower plate 24A attached to the mounting plate 22F of the lower frame body 22, a flat plate-shaped upper plate 24B attached to the mounting plate 23F of the upper frame body 23, and a lower plate 24A. It is configured to include an intermediate connecting plate 24C that connects between the upper plate 24B and the upper plate 24B. The lower plate 24A is fastened to the mounting plate 22F of the lower frame body 22 using bolts 24D, and the upper plate 24B is fastened to the mounting plate 23F of the upper frame body 23 using bolts 24E. Further, a shaft support hole 24F for supporting one end 27A of the support shaft 27 is provided in the central portion of the intermediate connecting plate 24C.

The second shaft support plate 25 is provided between the leg portion 22B of the lower frame body 22 and the leg portion 23B of the upper frame body 23 in a state of facing the first shaft support plate 24 in the axial direction, and the support shaft 25 is provided. It supports the other end 27B of 27. Like the first shaft support plate 24, the second shaft support plate 25 has a lower plate 25A, an upper plate 25B, and an intermediate connecting plate 25C, and has a first length dimension in the front and rear directions. It is formed longer than the shaft support plate 24 of the above. The lower plate 25A is fastened to the mounting plate 22F of the lower frame body 22 using bolts 25D, and the upper plate 25B is fastened to the mounting plate 23F of the upper frame body 23 using bolts 25E. Further, a shaft support hole 25F for supporting the other end 27B of the support shaft 27 is provided in the central portion of the intermediate connecting plate 25C. Further, a portion of the intermediate connecting plate 25C on the rear side of the shaft support hole 25F is a motor mounting portion 25G for mounting the hydraulic motor 33 described later.

The hose reel 26 is rotatably attached to the base end side cylinder 13C of the outer arm 13 constituting the arm 12 via a support bracket 21. As shown in FIG. 7 and the like, the hose reel 26 includes a support shaft 27, a rotary shaft 28 rotatably inserted on the outer peripheral side of the support shaft 27, and four flanged cylinders attached to the rotary shaft 28. It is composed of drums 29, 30, 31, 32 having a shape and a hydraulic motor 33.

The support shaft 27 is provided so as to span the first shaft support plate 24 and the second shaft support plate 25 of the support bracket 21. One end 27A of the support shaft 27 in the axial direction is fixed to the first shaft support plate 24 in a state of being inserted into the shaft support hole 24F of the first shaft support plate 24. The other end 27B of the support shaft 27 in the axial direction is fixed to the second shaft support plate 27 in a state of being inserted into the shaft support hole 25F of the second shaft support plate 25. Inside the support shaft 27, four oil passages (not shown) extending in the axial direction are formed, and two oil passages are opened at both ends of the support shaft 27.

The rotary shaft 28 is rotatably fitted on the outer peripheral side of the support shaft 27. The rotary shaft 28 is rotatably arranged between the intermediate connecting plate 24C of the first shaft support plate 24 and the intermediate connecting plate 25C of the second shaft support plate 25.

The four drums 29, 30, 31, and 32 are attached to the outer peripheral side of the rotating shaft 28, respectively. These four drums 29 to 32 are formed of a flanged cylinder in which disk-shaped flanges are provided at both ends in the axial direction. The four drums 29 to 32 rotate integrally with the rotating shaft 28 by fixing the central portion thereof to the rotating shaft 28. The breaker side hose 52B of the hydraulic hose 52 described later is wound around the drum 29, the breaker side hose 53B of the hydraulic hose 53 described later is wound around the drum 30, and the cylinder side of the hydraulic hose 60 described later is wound around the drum 31. The hose 60B is wound around, and the cylinder-side hose 61B of the hydraulic hose 61, which will be described later, is wound around the drum 32. The ends of the breaker-side hoses 52B and 53B and the cylinder-side hoses 60B and 61B are connected to four oil passages provided on the support shaft 27 via a rotating shaft 28.

The hydraulic motor 33 is attached to a second shaft support plate 25 that constitutes the support bracket 21. The hydraulic motor 33 rotates the rotating shaft 28 of the hose reel 26 and the four drums 29 to 32 about the support shaft 27 by supplying the pilot pressure from the pilot pump 46 described later. The hydraulic motor 33 is fixed to the motor mounting portion 25G provided on the intermediate connecting plate 25C of the second shaft support plate 25, and the output shaft 33A of the hydraulic motor 33 passes through the intermediate connecting plate 25C to the drum 29 side. It is protruding. A pulley 34 is attached to the protruding end of the output shaft 33A, and a belt 35 is wound between the pulley 34 and the rotating shaft 28. Therefore, the rotation of the hydraulic motor 33 (output shaft 33A) is transmitted to the rotating shaft 28 through the pulley 34 and the belt 35, and the four drums 29 to 32 are in the winding direction (breaker side hoses 52B, 53B, cylinder side hose 60B). , 61B winding direction).

The joint attachment 36 is provided on the base end side flange 10C which is the end edge portion on one side in the length direction of the base cylinder 10, and the swivel joint 37 described later is attached to the joint attachment tool 36. The joint fitting 36 includes a plurality of square tubular arms 36A (for example, three) extending from the base end side flange 10C to the rear side (upper swing body 3 side) along the support bracket 21, and each arm. It has a connecting portion 36B for connecting the portions 36A and a flat plate-shaped mounting plate portion 36C attached to the protruding end of each arm portion 36A, and is formed in a frame shape surrounding the upper half of the support bracket 21 from the outside. ing. The outer cylinder 37A of the swivel joint 37 is attached to the mounting plate portion 36C of the joint fitting 36.

The swivel joint 37 is provided on the mounting plate portion 36C of the joint fitting 36. When the outer arm 13 rotates with respect to the base cylinder 10, the swivel joint 37 applies pressure oil from the hydraulic pump 44 to the telescopic cylinder 18, the breaker 19C, and the work tool cylinder 20 arranged on the outer arm 13 side. At the same time, the pilot pressure from the pilot pump 46 is supplied to the hydraulic motor 33 arranged on the outer arm 13 side.

Here, the swivel joint 37 is rotatably inserted into the cylindrical outer cylinder 37A fixed to the mounting plate portion 36C of the joint fitting 36 and the inner peripheral side of the outer cylinder 37A, and protrudes from the outer cylinder 37A. Has an inner cylinder (spindle) 37B attached to the support bracket 21 via a fixture 38. The rotation axis of the inner cylinder 37B is arranged on the same axis as the rotation axis of the outer arm 13, and the inner cylinder 37B rotates together with the outer arm 13.

As shown in FIG. 11, the outer cylinder 37A of the swivel joint 37 includes the hydraulic source side hoses 56A, 57A of the hydraulic hoses 56, 57 described later connected to the telescopic cylinder 18, and the hydraulic hoses described later connected to the breaker 19C. The hydraulic source side hoses 52A and 53A of 52 and 53, the hydraulic source side hoses 60A and 61A of the hydraulic hoses 60 and 61 connected to the work tool cylinder 20, and the pilot pipeline for the motor described later connected to the hydraulic motor 33. The pilot pipelines 62A and 63A on the hydraulic source side of 62 and 63 are connected. On the other hand, the inner cylinder 37B of the swivel joint 37 includes the cylinder side hoses 56B and 57B of the hydraulic hoses 56 and 57 connected to the telescopic cylinder 18, and the breaker side hoses 52B and 53B of the hydraulic hoses 52 and 53 connected to the breaker 19C. , The cylinder side hoses 60B and 61B of the hydraulic hoses 60 and 61 connected to the work tool cylinder 20, and the motor side pilot lines 62B and 63B of the motor pilot lines 62 and 63 connected to the hydraulic motor 33 are connected. There is.

As a result, the outer arm 13 rotates with respect to the base cylinder 10, and when the telescopic cylinder 18, the work tool cylinder 20, the breaker 19C of the work tool 19, and the hydraulic motor 33 rotate together with the outer arm 13, the telescopic cylinder The hydraulic hoses 56 and 57 connected to 18, the hydraulic hoses 52 and 53 connected to the breaker 19C, the hydraulic hoses 60 and 61 connected to the work tool cylinder 20, and the motor pilot pipeline 62 connected to the hydraulic motor 33. , 63 can smoothly flow the flood control through the swivel joint 37.

The hose guide 39 is located on the support bracket 21 between the base end side cylinder 13C of the outer arm 13 and the hose reel 26. The hose guide 39 guides the breaker side hoses 52B and 53B connected to the breaker 19C toward the drums 29 and 30, and also directs the cylinder side hoses 60B and 61B connected to the work tool cylinder 20 toward the drums 31 and 32. It guides you.

Next, the gate lock lever 43 provided in the cab 5 will be described. As shown in FIG. 10, a driver's seat 40 in which the operator is seated is provided in the cab 5. An entrance / exit 5A connected to the driver's seat 40 is provided on the left side surface of the cab 5, and the entrance / exit 5A is opened and closed by the door 5B. The operator gets on and off the cab 5 through the entrance 5A with the door 5B open. A traveling operation lever / pedal 41 is arranged on the front side of the driver's seat 40, and the traveling operation of the lower traveling body 2 can be controlled by operating the traveling operation lever / pedal 41. Left and right work operation levers 42 are arranged on the left and right sides of the driver's seat 40, and by operating the work operation levers 42, the rotation operation of the upper swing body 3 and the operation of the work device 9 are controlled. can do.

The gate lock lever 43 is provided on the left side of the driver's seat 40 and on the entrance / exit 5A side of the cab 5. The gate lock lever 43 is switched between a lock position for opening the entrance / exit 5A and an unlock position for blocking the entrance / exit 5A by the operator's tilting operation. The gate lock lever 43 includes a gate lock switch 67, which will be described later, which is mechanically turned on and off by a tilting operation of the gate lock lever 43. As a result, when the gate lock lever 43 is in the locked position, the supply of pilot pressure to the directional control valves 49, 54, 58, which will be described later, is prohibited, and when the gate lock lever 43 is in the unlocked position, the directional control valve 49 , 54, 58 are allowed to supply pilot pressure.

Next, a hydraulic circuit for supplying pressure oil for operation to the telescopic cylinder 18, the breaker 19C of the work tool 19, the work tool cylinder 20, and the hydraulic motor 33 constituting the work device 9 will be described with reference to FIG. do.

The hydraulic pump 44 constitutes a main hydraulic source together with the tank 45, and the pilot pump 46 constitutes a pilot hydraulic source together with the tank 45. The hydraulic pump 44 and the pilot pump 46 are driven by an engine (not shown). The telescopic cylinder 18, the breaker 19C, and the work tool cylinder 20 are connected to a hydraulic source including a hydraulic pump 44 and a tank 45 via main pipelines 47 and 48.

A directional control valve 49 for controlling the direction of the pressure oil supplied to the breaker 19C is provided in the middle of the main pipelines 47 and 48 connecting the breaker 19C and the hydraulic source. The directional control valve 49 is composed of, for example, a hydraulic directional control valve at four ports and three positions, and the hydraulic pilot portions 49A and 49B of the directional control valve 49 are connected to the pilot pump 46 via a pilot pipe line 50. A pilot valve device 51 is provided in an intermediate portion of the pilot pipeline 50 located between the hydraulic pilot portions 49A and 49B of the directional control valve 49 and the pilot pump 46. The pilot valve device 51 is operated by a working operation lever 42 arranged in the cab 5, and supplies the pilot pressure from the pilot pump 46 to the hydraulic pilot units 49A and 49B of the directional control valve 49. When the pilot pressure is supplied to the hydraulic pilot unit 49A, the directional control valve 49 is switched from the neutral position to the switching position (a). On the other hand, when the pilot pressure is supplied to the hydraulic pilot unit 49B, the directional control valve 49 is switched from the neutral position to the switching position (b). As a result, the pressure oil from the hydraulic pump 44 is supplied to the breaker 19C via the main pipelines 47 and 48, and the breaker 19C vibrates at high speed.

Of the main pipelines 47 and 48, the portion connecting the directional control valve 49 and the breaker 19C is composed of the hydraulic hoses 52 and 53. Since the breaker 19C rotates with respect to the base cylinder 10 together with the outer arm 13, the intermediate portions of the hydraulic hoses 52 and 53 are connected to the swivel joint 37. As a result, the hydraulic hoses 52 and 53 have the hydraulic source side hoses 52A and 53A between the direction control valve 49 and the swivel joint 37, and the breaker side hoses 52B and 53B between the swivel joint 37 and the breaker 19C. There is.

Here, the breaker 19C moves in the length direction of the outer arm 13 as the inner arm 17 expands and contracts with respect to the outer arm 13. Therefore, the breaker side hose 52B is wound around the drum 29 of the hose reel 26, and the breaker side hose 53B is wound around the drum 30 of the hose reel 26. As a result, when the inner arm 17 moves (reduces) into the outer arm 12, the drums 29 and 30 of the hose reel 26 rotate in the winding direction, so that the breaker side hoses 52B and 53B loosen. It is configured to suppress.

A directional control valve 54 for controlling the direction of the pressure oil supplied to the telescopic cylinder 18 is provided in the middle of the main pipelines 47 and 48 connecting the telescopic cylinder 18 and the hydraulic source. The directional control valve 54 is composed of, for example, a hydraulic directional control valve at four ports and three positions, and the hydraulic pilot portions 54A and 54B of the directional control valve 54 are connected to the pilot pump 46 via a pilot pipe line 50. A pilot valve device 55 is provided in an intermediate portion of the pilot pipeline 50 located between the hydraulic pilot portions 54A and 54B of the directional control valve 54 and the pilot pump 46. The pilot valve device 55 is operated by a working operation lever 42 arranged in the cab 5, and supplies the pilot pressure from the pilot pump 46 to the hydraulic pilot units 54A and 54B of the directional control valve 54. When the pilot pressure is supplied to the hydraulic pilot unit 54A, the directional control valve 54 is switched from the neutral position to the switching position (c). On the other hand, when the pilot pressure is supplied to the hydraulic pilot unit 54B, the directional control valve 54 is switched from the neutral position to the switching position (d). As a result, the pressure oil from the hydraulic pump 44 is supplied to the telescopic cylinder 18 via the main pipelines 47 and 48, and the inner arm 17 moves in the axial direction of the outer arm 13 according to the telescopic operation of the telescopic cylinder 18.

Of the main pipelines 47 and 48, the portions connecting the directional control valve 54 and the telescopic cylinder 18 are composed of hydraulic hoses 56 and 57. Since the telescopic cylinder 18 rotates with respect to the base cylinder 10 together with the outer arm 13, the intermediate portions of the hydraulic hoses 56 and 57 are connected to the swivel joint 37. As a result, the hydraulic hoses 56 and 57 have the hydraulic source side hoses 56A and 57A between the direction control valve 54 and the swivel joint 37, and the cylinder side hoses 56B and 57B between the swivel joint 37 and the telescopic cylinder 18. ing.

A directional control valve 58 for controlling the direction of the pressure oil supplied to the work tool cylinder 20 is provided in the middle of the main pipelines 47 and 48 connecting the work tool cylinder 20 and the hydraulic source. The directional control valve 58 is composed of, for example, a hydraulic directional control valve at four ports and three positions, and the hydraulic pilot portions 58A and 58B of the directional control valve 58 are connected to the pilot pump 46 via a pilot pipe line 50. A pilot valve device 59 is provided in an intermediate portion of the pilot pipeline 50 located between the hydraulic pilot portions 58A and 58B of the directional control valve 58 and the pilot pump 46. The pilot valve device 59 is operated by a working operation lever 42 arranged in the cab 5, and supplies the pilot pressure from the pilot pump 46 to the hydraulic pilot units 58A and 58B of the directional control valve 58. When the pilot pressure from the pilot pump 46 is supplied to the hydraulic pilot unit 58A, the directional control valve 58 is switched from the neutral position to the switching position (e). On the other hand, when the pilot pressure is supplied to the hydraulic pilot unit 58B, the directional control valve 58 is switched from the neutral position to the switching position (f). As a result, the pressure oil from the hydraulic pump 44 is supplied to the work tool cylinder 20 via the main pipelines 47 and 48, and the holder 19B of the work tool 19 is centered on the support shaft 19A according to the expansion and contraction of the work tool cylinder 20. It rotates upward and downward.

Of the main pipelines 47 and 48, the portion connecting the directional control valve 58 and the work tool cylinder 20 is composed of the hydraulic hoses 60 and 61. Since the work tool cylinder 20 rotates with respect to the base cylinder 10 together with the outer arm 13, the intermediate portions of the hydraulic hoses 60 and 61 are connected to the swivel joint 37. As a result, the hydraulic hoses 60 and 61 have the hydraulic source side hoses 60A and 61A between the direction control valve 58 and the swivel joint 37, and the cylinder side hoses 60B and 61B between the swivel joint 37 and the work tool cylinder 20. It has become.

Here, the work tool cylinder 20 moves in the length direction of the outer arm 13 as the inner arm 17 expands and contracts with respect to the outer arm 13. Therefore, the cylinder-side hose 60B is wound around the drum 31 of the hose reel 26, and the cylinder-side hose 61B is wound around the drum 32 of the hose reel 26. As a result, when the inner arm 17 moves into the outer arm 12, the drums 31 and 32 of the hose reel 26 rotate in the winding direction, so that the cylinder side hoses 60B and 61B are prevented from loosening. It has become.

The hydraulic motor 33 that rotates the hose reel 26 is connected to the pilot hydraulic source via the motor pilot lines 62 and 63 that form a part of the pilot line 50. The motor pilot line 62 is connected to the pilot line 50 at the connection point 50A, and the hydraulic motor 33 is located downstream of the gate lock valve 64 described later and is connected to the motor pilot lines 62 and 63. ing. The hydraulic motor 33 rotates the drums 29, 30, 31, and 32 of the hose reel 26 in the winding direction by supplying the pilot pressure discharged from the pilot pump 46.

As shown in FIG. 7, the hydraulic motor 33 is fixed to the inner arm 17 via the support bracket 21 and rotates with respect to the base cylinder 10 together with the outer arm 13. Therefore, the intermediate portion of the motor pilot pipelines 62 and 63 is connected to the swivel joint 37. As a result, the motor pilot pipes 62 and 63 have the hydraulic source side pilot pipes 62A and 63A between the pilot hydraulic source and the swivel joint 37, and the motor side pilot pipe between the swivel joint 37 and the hydraulic motor 33. The roads are 62B and 63B.

The gate lock valve 64 is located between the pilot valve devices 51, 55, 59 and the pilot pump 46, and is provided in the middle of the pilot line 50. The gate lock valve 64 is composed of, for example, an electromagnetic directional control valve having 3 ports and 2 positions, and has an electromagnetic pilot unit 64A. The electromagnetic pilot portion 64A of the gate lock valve 64 is connected to a power source 66 such as a battery via a cable 65. The gate lock valve 64 holds the cutoff position (g) when power is not supplied from the power supply 66 to the electromagnetic pilot unit 64A, and shuts off the pilot line 50. On the other hand, the gate lock valve 64 is switched to the communication position (h) when power is supplied from the power source 66 to the electromagnetic pilot unit 64A, and the pilot pipe line 50 is communicated with the gate lock valve 64.

The gate lock switch 67 is provided in the middle of the cable 65 that connects the electromagnetic pilot portion 64A of the gate lock valve 64 and the power supply 66. The gate lock switch 67 is composed of a mechanical switch that is interlocked with the operation of the gate lock lever 43, and is turned on and off by the tilting operation of the gate lock lever 43. For example, when the gate lock lever 43 is in the locked position, the gate lock switch 67 is turned off (non-energized state), and the gate lock valve 64 is held in the shutoff position (g). As a result, the pilot line 50 is cut off, and the supply of pilot pressure to the pilot valve devices 51, 55, 59 and the hydraulic motor 33 is prohibited.

On the other hand, when the gate lock lever 43 is in the unlocked position, the gate lock switch 67 is turned on (energized state) and the gate lock valve 64 is switched to the communication position (g). As a result, the pilot line 50 communicates with each other, and the pilot pressure is supplied to the pilot valve devices 51, 55, 59 and the hydraulic motor 33.

The pressure reducing valve 68 as a pressure reducing device is located between the gate lock valve 64 and the hydraulic motor 33 and is provided in the middle of the motor pilot line 62. The pressure reducing valve 68 limits the pilot pressure supplied to the hydraulic motor 33 through the motor pilot line 62 to a value lower than the relief pressure set by the relief valve 69.

That is, as shown in FIG. 12, when the gate lock valve 64 is switched between the shutoff position (g) and the communication position (h), the pilot pressure supplied to the hydraulic motor 33 through the motor pilot line 62 The pressure changes as shown in the characteristic line 70. That is, the set pressure P1 output by the pressure reducing valve 68 is lower than the relief set pressure P0 by the relief valve 69 in order to give a stable and appropriate tension to the hydraulic hoses 52, 53, 60, 61 via the hose reel 26. It is set. As a result, even when the gate lock valve 64 is in the communication position (h) and the pilot pressure is supplied to the hydraulic motor 33, the directional control valves 49, 54 respond to the operation of the pilot valve devices 51, 55, 59. , 58 hydraulic pilot units 49A, 49B, 54A, 54B, 58A, 58B can be supplied with sufficient pilot pressure.

The dismantling work machine 1 according to the present embodiment has the above-described configuration, and a case where the blast furnace 101 is repaired by using the dismantling work machine 1 will be described below.

First, the operator opens the door 5B provided in the cab 5 of the dismantling work machine 1, and sits in the driver's seat 40 through the entrance 5A. At this time, since the gate lock lever 43 holds the lock position for blocking the entrance / exit 5A, the operator switches the gate lock lever 43 to the unlock position to open the entrance / exit 5A. When the gate lock lever 43 is held in the unlocked position, the gate lock switch 67 is turned on (energized state), and the gate lock valve 64 is switched to the communication position (g). As a result, the pilot line 50 communicates, the pilot pressure from the pilot pump 46 is supplied to the hydraulic motor 33 through the pilot line 62 for the motor and the swivel joint 37, and the hydraulic motor 33 rotates. The rotation of the hydraulic motor 33 (output shaft 33A) is transmitted to the rotating shaft 28 of the hose reel 26 via the belt 35, and the drums 29 to 32 attached to the rotating shaft 28 can rotate in the winding direction. Become.

In this state, the lower traveling body 3 travels in response to the operation of the traveling operation lever / pedal 41, and the dismantling work machine 1 stops outside the blast furnace 101 in the vicinity of the opening 102 provided in the blast furnace 101. Next, for example, by operating the work operation lever 42 to extend the base cylinder cylinder 11, the base cylinder 10 is rotated upward about the base cylinder support shaft 10F, and the posture is upward with respect to the horizontal direction. Hold.

In this state, by extending the telescopic cylinder 18, the inner arm 17 is extended with respect to the outer arm 13, and the working tool 19 provided on the tip side of the inner arm 17 is moved away from the opening 102 of the blast furnace 101. Move to the place. Next, by operating the arm rotating device 15, the inner arm 17 is rotated with respect to the outer arm 13, and the working tool 19 is directed to the upper surface of the blast furnace 101.

Further, by expanding and contracting the work tool cylinder 20, the holder 19B of the work tool 19 is rotated around the support shaft 19A, and the breaker 19C held by the holder 19B is provided on the inner wall 103 of the upper surface of the blast furnace 101. It faces the refractory brick 104. By supplying pressure oil to the breaker 19C in this state, the breaker 19C vibrates at high speed, and the refractory brick 104 can be crushed.

In this way, the base cylinder 11 changes the inclination of the base cylinder 10 with respect to the horizontal direction, and the telescopic cylinder 18 expands and contracts the inner arm 17 with respect to the outer arm 13. Further, the arm rotating device 15 rotates the inner arm 17 with respect to the outer arm 13, and the working tool cylinder 20 changes the angle of the working tool 19 with respect to the inner arm 17. As a result, the breaker 19C of the working tool 19 can be opposed to all the refractory bricks 104 provided on the inner walls 103 of the upper surface, the lower surface, the front surface, the rear surface, the left and the right side surfaces of the blast furnace 101, and many of these refractory bricks are fire resistant. Of the bricks 104, the melted refractory bricks 104 can be selectively crushed by the breaker 19C and peeled off from the inner wall 103.

During the repair work of the blast furnace 101, when the inner arm 17 is expanded and contracted with respect to the outer arm 13, the work tool cylinder 20 moves in the length direction of the inner arm 17. On the other hand, the breaker side hoses 52B and 53B of the hydraulic hoses 52 and 53 connected to the breaker 19C are wound around the drums 29 and 30 of the hose reel 26. Further, the cylinder side hoses 60B and 61B of the hydraulic hoses 60 and 61 connected to the work tool cylinder 20 are wound around the drums 31 and 32 of the hose reel 26.

Here, when the dismantling work machine 1 is operating, when the gate lock lever 43 is in the unlocked position, the gate lock valve 64 holds the communication position (g), and the pilot pressure from the pilot pump 46 is always the hydraulic motor. It is supplied to 33. Since the rotation of the hydraulic motor 33 is transmitted to the rotating shaft 28 of the hose reel 26 via the belt 35, the drums 29 to 32 attached to the rotating shaft 28 are always in a state where they can rotate in the winding direction. Therefore, with respect to the breaker side hoses 52B and 53B of the hydraulic hoses 52 and 53 wound around the drums 29 and 30, and the cylinder side hoses 60B and 61B of the hydraulic hoses 60 and 61 wound around the drums 31 and 32. A constant tension can always be applied.

Therefore, when the inner arm 17 shrinks into the outer arm 13 and the breaker 19C and the work tool cylinder 20 move to the rear side (hose reel 26 side), the breakers of the hydraulic hoses 52 and 53 connected to the breaker 19C The side hoses 52B and 53B can be wound by the drums 29 and 30 of the hose reel 26. Similarly, the cylinder side hoses 60B and 61B of the hydraulic hoses 60 and 61 connected to the work tool cylinder 20 can be wound by the drums 31 and 32 of the hose reel 26. Therefore, it is possible to prevent the hydraulic hoses 52 and 53 connected to the breaker 19C and the hydraulic hoses 60 and 61 connected to the work tool cylinder 20 from being loosened inside the inner arm 17 and the outer arm 13. As a result, it is possible to prevent the hydraulic hoses 52, 53, 60, and 61 from coming into contact with the structures provided inside the inner arm 17 and the outer arm 13, and the durability thereof can be improved.

Moreover, the hose reel 26 gently rotates in the winding direction due to the pilot pressure from the pilot pump 46 supplied to the hydraulic motor 33. Therefore, the thrust when the expansion / contraction cylinder 18 expands / contracts due to the pressure oil supplied from the hydraulic pump 44 is larger than the rotational force when the hose reel 26 is rotated in the winding direction. Therefore, when the telescopic cylinder 18 is extended to move the inner arm 17 to the front side, the breaker side hoses 52B and 53B of the hydraulic hoses 52 and 53 connected to the breaker 19C are moved from the drums 29 and 30 of the hose reel 26. It can be smoothly unwound, and the cylinder-side hoses 60B and 61B of the hydraulic hoses 60 and 61 connected to the work tool cylinder 20 can be smoothly unwound from the drums 31 and 32 of the hose reel 26.

Then, after the operation of the dismantling work machine 1 is stopped, the gate lock lever 43 is switched to the lock position, so that the gate lock valve 64 holds the shutoff position (g). By stopping the engine in this state, the repair work of the blast furnace 101 is completed.

Thus, the dismantling work machine 1 according to the embodiment is in the middle of the pilot line 50 connecting the direction control valves 49, 54, 58 and the pilot hydraulic source including the pilot pump 46 and the tank 45, and the pilot line 50. A gate lock that opens or shuts off the pilot valve devices 51, 55, 59 that control the supply and discharge of pilot pressure to the directional control valves 49, 54, 58 and the entrance / exit 5A of the cab 5 that connects to the driver's seat 40. The pilot line 50 is located between the lever 43, the pilot oil source, and the pilot valve devices 51, 55, 59 and is provided in the middle of the pilot line 50. When the gate lock lever 43 shuts off the entrance / exit 5A, the pilot line 50 The gate lock valve 64 and the gate lock valve 64 are connected to the pilot pipeline 62 for a motor located downstream of the gate lock valve 64, and the pilot pressure is supplied when the gate lock lever 43 shuts off the entrance / exit 5A. This includes a hydraulic motor 33 that rotates the hose reel 26 in the winding direction.

According to this configuration, the pilot pressure from the pilot pump 46 is supplied to the hydraulic motor 33 by switching the gate lock lever 43 to the unlock position that shuts off the entrance / exit 5A of the cab 5 when the dismantling work machine 1 is operated. NS. As a result, the hose reel 26 can always be urged in the winding direction while the gate lock lever 43 holds the unlocked position. Therefore, the hydraulic hoses 52 and 53 (breaker side hoses 52B and 53B) of the breaker 19C wound around the drums 29 and 30 of the hose reel 26 and the hydraulic hose 60 of the work tool cylinder 20 wound around the drums 31 and 32. , 61 (cylinder side hoses 60B, 61B) can always be subjected to a constant tension.

As a result, when the inner arm 17 is reduced to the inside of the outer arm 13, the hydraulic hoses 52 and 53 (breaker side hoses 52B and 53B) of the breaker 19C are wound by the drums 29 and 30 and the hydraulic pressure of the work tool cylinder 20 is increased. The hoses 60 and 61 (cylinder side hoses 60B and 61B) can be wound by the drums 31 and 32. As a result, the hydraulic hoses 52 and 53 of the breaker 19C and the hydraulic hoses 60 and 61 of the work tool cylinder 20 are prevented from loosening inside the inner arm 17 and the outer arm 13, and the inside of the inner arm 17 and the outer arm 13 is suppressed. Since it is possible to avoid contact with the structure provided in the above, its durability can be improved.

In the embodiment, the arm 12 of the dismantling work machine 1 is provided with a tubular outer arm 13 rotatably housed inside the base cylinder 10 and a tubular outer arm 13 that is movably provided in the outer arm 13 in the length direction and has a tip side. It is composed of an inner arm 17 projecting to the outside of the outer arm 13, and the breaker 19C and the work tool cylinder 20 are provided on the tip end side of the inner arm 17. According to this configuration, by rotating the inner arm 17 with respect to the outer arm 13, for example, all refractory bricks 104 provided on the inner walls 103 of the upper surface, lower surface, front surface, rear surface, left and right side surfaces of the blast furnace 101. The breaker 19C is opposed to the blast furnace 19C, and the melted refractory bricks 104 among the large number of the refractory bricks 104 can be selectively crushed by the breaker 19C.

In the embodiment, a pressure reducing valve 68 is provided between the gate lock valve 64 and the hydraulic motor 33 to limit the pilot pressure supplied to the hydraulic motor 33. According to this configuration, even when the gate lock valve 64 is in the communication position (h) and the pilot pressure is supplied to the hydraulic motor 33, each direction control valve is operated according to the operation of each pilot valve device 51, 55, 59. Sufficient pilot pressure can be supplied to the hydraulic pilot units 49A, 49B, 54A, 54B, 58A, 58B of 49, 54, 58.

In the embodiment, a case where the breaker 19C is used as the working tool 19 for crushing the refractory bricks 104 provided on the inner wall 103 of the blast furnace 101 is illustrated. However, the present invention is not limited to this, for example, as a configuration in which a grapple (grip device), a cutter (cutting device), etc., which are operated by supplying and discharging pressure oil, are used as work tools in order to dismantle the inside of a building. May be good.

2 Lower running body (body)
3 Upper swivel body (body)
5 Cab 5A Entrance / exit 10 Base cylinder 12 Arm 13 Outer arm 17 Inner arm 19C Breaker (flood actuator)
20 Work tool cylinder (hydraulic actuator)
26 Hose reel 33 Hydraulic motor 40 Driver's seat 43 Gate lock lever 44 Hydraulic pump (hydraulic source)
45 tanks (hydraulic source, pilot hydraulic source)
46 Pilot pump (pilot oil source)
47,48 Main line 49,54,58 Directional control valve 50 Pilot line 51,55,59 Pilot valve device 52,53,56,57,60,61 Hydraulic hose 62,63 Pilot line for motor (Pilot line) )
64 Gate lock valve 68 Pressure reducing valve

Claims (3)

A self-propelled car body with a driver's seat and
A tubular base cylinder that is attached to the vehicle body so that it can move up and down and extends in the front and rear directions.
A tubular arm provided inside the base cylinder so as to be movable in the length direction,
A hydraulic actuator provided on the tip side of the arm and
A hose reel rotatably provided on the arm and
A directional control valve provided in the middle of the main pipeline connecting the hydraulic actuator and the hydraulic source to control the supply and discharge of pressure oil to the hydraulic actuator according to the pilot pressure.
In a construction machine including a hydraulic hose that forms a part of the main pipeline and is wound around the hose reel.
A pilot line connecting the directional control valve and the pilot hydraulic source,
A pilot valve device provided in the middle of the pilot pipeline and controlling the supply and discharge of pilot pressure to the directional control valve.
A gate lock lever that opens or shuts off the entrance / exit connected to the driver's seat,
A gate lock valve located between the pilot hydraulic source and the pilot valve device and provided in the middle of the pilot pipeline to communicate with the pilot pipeline when the gate lock lever shuts off the entrance / exit. ,
The hose reel is rotated in the winding direction by being connected to the pilot pipeline located on the downstream side of the gate lock valve and supplying pilot pressure when the gate lock lever shuts off the entrance / exit. A construction machine characterized by being equipped with a hydraulic motor to make it. The arm includes a tubular outer arm rotatably housed inside the base cylinder and a tubular outer arm.
It is composed of an inner arm that is provided in the outer arm so as to be movable in the length direction and whose tip side protrudes to the outside of the outer arm.
The construction machine according to claim 1, wherein the hydraulic actuator is provided on the tip end side of the inner arm. The construction machine according to claim 1, wherein a pressure reducing device for limiting the pilot pressure supplied to the hydraulic motor is provided between the gate lock valve and the hydraulic motor.

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