JP2020131795A - Construction machine - Google Patents

Abstract

To provide a construction machine which enables improvement of efficiency of work of discharging drainage.SOLUTION: A discharge pipe 15 is provided at a bottom part 12A (a discharge port 12E) of a fuel tank 12. The discharge pipe 15 and a drain pipe 17 are connected through a relay member 21. The relay member 21 comprises: a vertical pipe part 22 in which the upper end side is connected to the discharge pipe 15 and communicates with the fuel tank 12 and the lower end side is hung downward; and a plug 24 detachably attached to the lower end side of the vertical pipe part 22. The drain pipe 17 is connected to the vertical pipe part 22 and communicates with the fuel tank 12.SELECTED DRAWING: Figure 2

Description

The present invention relates to, for example, a construction machine such as a hydraulic excavator, and more particularly to a construction machine in which a tank device such as a fuel tank device is mounted on a vehicle body.

In general, a hydraulic excavator, which is a typical example of a construction machine, enables a self-propelled lower traveling body, an upper rotating body mounted on the lower traveling body so as to be able to turn, and an up-and-down movement on the front side of the upper turning body. It is composed of an attached front device.

The upper swivel body includes a swivel frame forming a support structure, a cab provided on the front side of the swivel frame on which the operator rides, and a counterweight provided on the rear end side of the swivel frame to balance the weight of the front device. It is configured to include. The upper swing body is provided with an exterior cover located in front of the counterweight and accommodating various devices such as a prime mover (for example, an engine), a hydraulic pump, and a control valve. Further, the upper swivel body is provided with a tank device (for example, a fuel tank device). The fuel tank as the oil storage tank constituting the fuel tank device stores fuel (for example, light oil, gasoline) to be supplied to the engine.

In addition to fuel, the inside of the fuel tank may contain foreign matter mixed during refueling and drainage of water or the like generated by dew condensation or the like. Since this drainage has a heavier specific gravity than the fuel, it settles at the bottom of the fuel tank. Therefore, a drain pipe for draining the drainage liquid is connected to the bottom of the fuel tank. The drain pipe is provided with an on-off valve that allows drainage to flow out by opening the valve and regulates drainage and fuel outflow by closing the valve (see, for example, Patent Document 1). Patent Document 1 includes a joint (heating means) for circulating the return fuel from the engine to the fuel tank around the drain pipe.

JP-A-2015-39988

Here, in a cold region or the like, the drainage liquid such as water collected at the bottom of the fuel tank may freeze and block the drainage port in the drain pipe. In this case, in the configuration in which the on-off valve is provided in the middle of the drain pipe as in Patent Document 1, in order to access the bottom side in the fuel tank, the on-off valve and a part of the drain pipe must be removed. It doesn't become. As a result, there is a problem that it takes time and effort to discharge the frozen drainage. Further, in Patent Document 1, in order to melt the frozen effluent, it is necessary to warm up the engine until the return fuel warms up, which takes time.

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 provide a construction machine capable of easily removing foreign matter and frozen drainage settled on the bottom of an oil storage tank. To provide.

The present invention is provided with an oil storage tank for storing oil liquid inside, a discharge pipe provided at the bottom of the oil storage tank and communicating with the inside of the oil storage tank, and a discharge pipe connected to the discharge pipe and provided inside the oil storage tank. In a construction machine provided with a drain pipe for draining the discharged liquid settled in the water to the outside, the drain pipe and the drain pipe are connected via a relay member, and the upper end side of the relay member is connected. The drain pipe is connected to the discharge pipe and is connected to the oil storage tank, and is composed of a vertical pipe portion whose lower end side hangs downward and a plug detachably attached to the lower end side of the vertical pipe portion. , It is connected to the vertical pipe portion and communicates with the inside of the oil storage tank.

According to the present invention, foreign matter settled on the bottom of the oil storage tank and frozen drainage can be easily removed, and the work efficiency of draining the drainage can be improved.

It is a front view which shows the hydraulic excavator which concerns on 1st Embodiment of this invention. It is an enlarged view of the partial cross section which shows the fuel tank device in FIG. It is an enlarged view of the partial cross section which shows the part III in FIG. FIG. 3 is an enlarged cross-sectional view showing a state in which the plug in FIG. 3 is removed and the crushing rod is inserted from the lower end side of the vertical pipe portion. It is an enlarged view of a partial cross section of the fuel tank device mounted on the hydraulic excavator according to the second embodiment of the present invention as viewed from the same position as in FIG.

Hereinafter, a hydraulic excavator will be taken as an example of the construction machine according to the embodiment of the present invention, and will be described in detail with reference to the attached drawings.

1 to 4 show the first embodiment. In FIG. 1, the hydraulic excavator 1 as a construction machine includes a crawler-type lower traveling body 2 capable of self-propelling in the front and rear directions, an upper rotating body 3 provided so as to be swivel on the lower traveling body 2, and an upper portion. The swivel body 3 includes a front device 4 provided so as to be able to move up and down. In this case, the lower traveling body 2 and the upper turning body 3 constitute the vehicle body of the hydraulic excavator 1.

The front device 4, which is also called a working device, is attached to the front side of the upper swing body 3 so as to be able to move up and down. The operator can perform excavation work of earth and sand by operating the front device 4.

The swivel frame 5 is a support frame that forms a support structure for the upper swivel body 3, and is mounted on the lower traveling body 2 so as to be swivelable. The swivel frame 5 has a thick bottom plate extending in the front and rear directions, a left vertical plate and a right vertical plate standing on the bottom plate and extending in the front and rear directions at predetermined intervals in the left and right directions, and a bottom plate. , Multiple overhanging beams extending outward from each vertical plate in the left and right directions and arranged at intervals in the front and rear directions, and attached to the tip of each overhanging beam located on the outside in the left and right directions. It is configured to include a left side frame (neither shown) extending in the front or rear direction and a right side frame 5A. Further, on the upper side of the overhang beam on the right side, a fuel tank device 11 described later is provided at a position close to the right side frame 5A.

In addition to the fuel tank device 11, the swivel frame 5 includes a cab 6 located on the left front side on which the operator rides, a counter weight 7 located on the rear side for balancing the weight of the front device 4, an engine, and hydraulic pressure. Various devices such as a pump and a heat exchange device (none of which are shown) are provided. These devices are covered with an exterior cover 8 which will be described later and forms an outer shell of the upper swing body 3.

The outer cover 8 forms the outer shell of the upper swivel body 3 and is arranged on the swivel frame 5. The exterior cover 8 is composed of a top cover 8A, an engine cover 8B, a left side cover (not shown), and a right side cover 8C. The right side cover 8C is provided so as to be openable and closeable, and in the open state, equipment such as a hydraulic pump can be maintained from the right side. Further, with the right side cover 8C open, the lever 19A of the first valve 19, which will be described later, can be operated.

The hydraulic oil tank 9 stores hydraulic oil supplied to various hydraulic actuators mounted on the hydraulic excavator 1. The hydraulic oil tank 9 is located on the front side of the hydraulic pump and is arranged on the right side of the swivel frame 5. The hydraulic oil tank 9 is formed as a rectangular parallelepiped closed container extending upward and downward.

Next, the configuration of the fuel tank device 11 mounted on the hydraulic excavator 1 and the drainage operation of the drainage liquid according to the first embodiment will be described.

As shown in FIG. 2, the fuel tank device 11 is arranged at a position on the right front side of the swivel frame 5 which is opposite to the cab 6 with the front device 4 in between. The fuel tank device 11 stores fuel F (oil liquid) to be supplied to the engine. Here, in the fuel tank 12 to be described later, which constitutes the fuel tank device 11, in addition to the fuel F, foreign matter such as sand, dust, insects, etc. mixed during the refueling of the fuel F, refueling in rainy weather, and dew condensation are generated. Water or the like is contained as drainage W. Therefore, the fuel tank device 11 has a relay member 21 described later, which can discharge the drainage W composed of foreign matter and frozen water even when the drainage work is difficult due to clogging of foreign matter or freezing of the drainage W. are doing. The fuel tank device 11 includes a fuel tank 12 as an oil storage tank, a discharge line 14, and a supply line (not shown).

The fuel tank 12 is mounted on the swivel frame 5 of the upper swivel body 3 and stores the fuel F as an oil liquid inside. The fuel tank 12 is located on the front side of the hydraulic oil tank 9 and is provided on the swivel frame 5. Specifically, the fuel tank 12 is a box composed of a rectangular bottom portion 12A, a square tubular side portion 12B extending upward from the periphery of the bottom portion 12A, and a rectangular upper portion 12C that closes the upper side of the side portion 12B. It is formed as a body.

In addition to the fuel F, the drainage W is contained inside the fuel tank 12. Since the drainage W has a heavier specific gravity than the fuel F, it has settled on the bottom 12A of the fuel tank 12. Further, a fuel filler port 12D is provided in the upper portion 12C of the fuel tank 12, and the fuel filler port 12D is closed by a removable cap 13. Then, the fuel filler port 12D can be replenished with fuel F by removing the cap 13. On the other hand, the bottom portion 12A of the fuel tank 12 is provided with a discharge port 12E and a supply port (not shown).

The discharge port 12E is formed so as to penetrate the bottom portion 12A of the fuel tank 12 in the upward and downward directions in order to discharge the drainage W. The discharge port 12E is connected to a discharge line 14 (a discharge pipe 15 described later) for discharging the drainage W to the outside of the upper swing body 3. Further, as shown in FIG. 4, the diameter dimension (inner diameter dimension) d1 of the discharge port 12E is set to be larger than the diameter dimension (inner diameter dimension) d2 of the insertion hole 15A of the discharge pipe 15 (d1> d2). ). A crushing rod 25, which will be described later, can be inserted through the discharge port 12E.

On the other hand, the supply port is provided in connection with the supply line for distributing the fuel F to the engine. The supply port is opened at a position higher than the discharge port 12E in order to prevent the drainage W settled in the bottom 12A of the fuel tank 12 from entering the engine.

The discharge line 14 is connected to the bottom 12A of the fuel tank 12 and discharges the drainage W in the fuel tank 12. One end of the discharge line 14 is connected to the bottom 12A (discharge port 12E) of the fuel tank 12, and the other end extends to, for example, the position of the right side cover 8C of the exterior cover 8, bends downward, and is arranged outside. Has been done. The discharge line 14 includes a discharge pipe 15, a connecting pipe 16, a drain pipe 17, a drain hose 18, a first valve 19, and a relay member 21.

The discharge pipe 15 is provided so as to be connected to the bottom 12A (discharge port 12E) of the fuel tank 12 and communicates with the inside of the fuel tank 12. The discharge pipe 15 discharges the drainage W settled in the fuel tank 12 to the outside. The discharge pipe 15 is formed as a cylinder extending in the upward and downward directions. The discharge pipe 15 is provided with an insertion hole 15A penetrating in the length direction (upward and downward directions). The upper end of the discharge pipe 15 is fixed to the lower surface 12F side of the fuel tank 12 by welding or the like so that the insertion hole 15A is located concentrically with the discharge port 12E of the fuel tank 12. On the other hand, the lower end of the insertion hole 15A is a female threaded portion 15B, and the male threaded portion 16C of the connecting pipe 16 is screwed into the female threaded portion 15B.

As shown in FIG. 4, the diameter dimension d2 of the insertion hole 16A of the discharge pipe 15 is smaller than the diameter dimension d1 of the discharge port 12E and equal to the diameter dimension (inner diameter dimension) d3 of the insertion hole 16A of the connection pipe 16. The dimensions are set to be slightly larger (d3 ≦ d2 <d1). As a result, when the crushing rod 25 described later is inserted into the insertion hole 16A of the connection pipe 16, the insertion hole 15A of the discharge pipe 15, and the discharge port 12E of the fuel tank 12 from below, the tip of the rod portion 25B of the crushing rod 25 is inserted. The portion 25B1 can be inserted so as not to be caught.

The connection pipe 16 is provided so as to be connected to the lower side of the discharge pipe 15. The connection pipe 16 connects the discharge pipe 15 and the relay member 21 described later, and is formed as, for example, a hexagonal nipple. The connecting pipe 16 is formed as a pipe body extending in the upward and downward directions, and is provided with an insertion hole 16A penetrating in the upward and downward directions. The diameter dimension d3 of the insertion hole 16A (see FIG. 4) is set to be equal to or slightly smaller than the diameter dimension d2 of the insertion hole 15A of the discharge pipe 15 (d3 ≦ d2).

A hexagonal portion 16B with which a tool such as a spanner is engaged is integrally formed in the upper and lower intermediate portions of the connecting pipe 16. Further, the connecting pipe 16 is provided with a male threaded portion 16C screwed to the female threaded portion 15B of the discharge pipe 15 at the upper position, and is screwed to the female threaded portion 22B of the vertical pipe portion 22 of the relay member 21 at the lower position. A male screw portion 16D is provided.

The drain pipe 17 is provided by being connected to the discharge pipe 15 via a relay member 21 and a connecting pipe 16 described later. Specifically, the drain pipe 17 is connected to the vertical pipe portion 22 of the relay member 21 via the horizontal pipe portion 23 of the relay member 21, and communicates with the inside of the fuel tank 12. The drain pipe 17 is for discharging the drainage W settled inside the fuel tank 12 to the outside, and is formed as a cylinder extending in the front and rear directions (lateral directions) of the upper swivel body 3. .. The drain pipe 17 has a drain hose 18 connected to the vertical pipe portion 22 via the horizontal pipe portion 23, and a first valve 19 for switching the flow and shutoff of the drainage W.

The drain hose 18 guides the drainage W discharged from the fuel tank 12 to the outside of the upper swing body 3. A connecting portion 18A is provided on one end side of the drain hose 18. The connection portion 18A is attached to the horizontal pipe portion 23 of the relay member 21 to connect the drain hose 18 to the vertical pipe portion 22. The drain hose 18 is formed as a pipe body extending in the front and rear directions of the upper swing body 3. The inside of the connecting portion 18A becomes an insertion hole 18A1 penetrating in the front and rear directions, and the drainage W flows through the insertion hole 18A1. A male screw portion 18A2 screwed with a female screw portion 23A of the horizontal pipe portion 23 of the relay member 21 is provided on one end side of the connection portion 18A on the upstream side in the flow direction (drainage direction) of the drainage W. Further, the other end side of the drain hose 18 extends along the left side of the right side frame 5A of the swivel frame 5 to the position of the right side cover 8C of the exterior cover 8, and the discharge port 18B bent downward is the upper swivel body 3. It protrudes to the outside (see FIG. 1). As a result, the drainage W discharged from the fuel tank 12 is discharged to the outside through the discharge port 18B. At this time, by arranging a drainage receiver (not shown) or the like in advance below the discharge port 18B, the drainage W discharged from the discharge port 18B can be received without being scattered around.

The first valve 19 is provided in the middle of the drain hose 18. The first valve 19 is formed as a manual valve for switching the flow and shutoff of the drainage W. In this case, as shown in FIG. 1, the first valve 19 is located on the right side of the swivel frame 5 at the position of the right side cover 8C so that the switching operation can be performed with the right side cover 8C of the exterior cover 8 open. It is arranged at the inner position in the left and right directions of the frame 5A. The first valve 19 is configured as, for example, a flat lever type ball valve.

The first valve 19 has a lever 19A for switching the flow (opening) and shutting off (closing) of the drainage W. For example, the lever 19A has a valve closing position at a position extending upward (position shown in FIG. 2) orthogonal to the length direction of the drain hose 18, and at this valve closing position, the flow of drainage W is blocked. Can be done.

On the other hand, the valve 19A has a valve opening position at a position where the lever 19A is rotated 90 degrees from the valve closing position and extends along the drain hose 18. At this valve opening position, the drainage W can be circulated. At this time, the lever 19A can be easily reached by opening the right side cover 8C, and the switching position can be easily visually recognized (confirmed). Further, the drainage operation can be performed by operating the lever 19A with one hand and holding the drainage receiver of the drainage W with the other hand.

Next, the configurations of the relay member 21, the plug 24, and the crushing rod 25, which are the characteristic parts of the first embodiment, will be described.

The relay member 21 is provided between the discharge pipe 15 and the drain pipe 17. The relay member 21 forms a part of the drainage line 14 of the drainage W, and connects the drainage pipe 15 and the drainage pipe 17. For example, the relay member 21 includes a vertical pipe portion 22 extending in the upward and downward directions, a horizontal pipe portion 23 extending in the horizontal direction (horizontal direction) from an intermediate position in the length direction of the vertical pipe portion 22, and a vertical pipe portion. It is composed of a plug 24 attached to 22. As a result, the relay member 21 is formed as a T-shaped joint member.

The vertical pipe portion 22 is formed as a tubular body extending in the upward and downward directions. The upper end side of the vertical pipe portion 22 is connected to the discharge pipe 15 via the connecting pipe 16 and communicates with the inside of the fuel tank 12, and the lower end side hangs downward. An insertion hole 22A is formed on the inner peripheral side of the vertical pipe portion 22 so as to penetrate upward and downward and allow the drainage W to flow. Further, the insertion hole 22A on the inner peripheral side of the vertical pipe portion 22 has a female screw portion 22B on the upper end side and a female screw portion 22C on the lower end side. Here, the female screw portion 22B and the female screw portion 22C are formed by, for example, continuous threads. In addition, each female thread portion may be formed by an independent thread.

As shown in FIG. 3, the male threaded portion 16D of the connecting pipe 16 is screwed to the female threaded portion 22B of the vertical pipe portion 22. As a result, the upper end side of the vertical pipe portion 22 is connected to the discharge pipe 15 via the connecting pipe 16. On the other hand, the male threaded portion 24A of the plug 24 is detachably screwed to the female threaded portion 22C of the vertical pipe portion 22.

The horizontal pipe portion 23 is provided at an intermediate portion of the vertical pipe portion 22 in the length direction (upward and downward directions) so as to project in the horizontal direction orthogonal to the length direction. On the inner peripheral side of the horizontal pipe portion 23, a female screw portion 23A is formed so as to communicate with the insertion hole 22A of the vertical pipe portion 22. The male threaded portion 18A2 of the connecting portion 18A of the drain hose 18 is screwed to the female threaded portion 23A. As a result, the insertion hole 18A1 of the connecting portion 18A is connected to the fuel tank 12 side through the horizontal pipe portion 23 and the vertical pipe portion 22.

As shown in FIGS. 2 and 3, the plug 24 is screwed into the female screw portion 22C provided on the inner peripheral side of the vertical pipe portion 22. The plug 24 closes the lower side of the insertion hole 22A of the vertical pipe portion 22 so as to be removable. The plug 24 is composed of a male screw portion 24A and a prism portion 24B located at the end of the male screw portion 24A and to which a tool such as a spanner is engaged. The male screw portion 24A of the plug 24 is detachably screwed to the female screw portion 22C located on the lower end side of the vertical pipe portion 22.

This plug 24 is screwed to the female thread portion 22C of the vertical pipe portion 22 during normal operation of the hydraulic excavator 1 and when the drainage W in the fuel tank 12 is discharged, and shuts off the lower end side of the insertion hole 22A from the outside. are doing. In other words, the drainage W in the fuel tank 12 can be circulated only on the drain hose 18 side.

On the other hand, the plug 24 is removed from the female screw portion 22C of the vertical pipe portion 22 when foreign matter is settled and accumulated on the bottom 12A side of the fuel tank 12 or the water is frozen and the drainage W is solidified. Will be done. As a result, as shown in FIG. 4, the crushing rod 25 described later can be inserted from the female thread portion 22C of the vertical pipe portion 22.

As shown in FIG. 4, the crushing rod 25 is used when removing the effluent W solidified on the bottom 12A side of the fuel tank 12. The crushing rod 25 is inserted into the insertion hole 22A of the vertical pipe portion 22 from below with the plug 24 removed from the vertical pipe portion 22. The crushing rod 25 includes a male screw portion 25A screwed into the female screw portion 22C of the vertical pipe portion 22, a rod portion 25B extending along the same axis from one end of the male screw portion 25A in the length direction, and a male screw portion 25A in the length direction. It is formed by a handle portion 25C provided at the other end of the.

The length dimension L of the crushing rod 25 is such that when the rod portion 25B is inserted into the vertical pipe portion 22 from below and the male screw portion 25A is screwed into the female screw portion 22C of the vertical pipe portion 22, the rod portion 25B The tip is set so that it can penetrate the layer of drainage W in the fuel tank 12. Further, the handle portion 25C of the crushing rod 25 can generate a large pressing force by grasping and rotating it by hand, and can crush even a hard drainage W made of ice or the like. In this case, by forming a part or all of the handle portion 25C into a prismatic shape, a tool such as a spanner can be engaged and a larger pressing force can be generated.

The diameter dimension (outer diameter dimension) D1 of the rod portion 25B is set to be smaller than the diameter dimension d3 of the insertion hole 16A of the connecting pipe 16 (D1 <d3). As a result, the rod portion 25B inserted into the insertion hole 22A of the vertical pipe portion 22 enters the fuel tank 12 through the insertion hole 16A of the connection pipe 16, the insertion hole 15A of the discharge pipe 15, and the discharge port 12E of the bottom 12A of the fuel tank 12. Can be reached.

At this time, the tip portion 25B1 of the rod portion 25B is formed as a pointed portion. Therefore, the drainage W of water (ice), foreign matter, etc. fixed (frozen) at the bottom 12A of the fuel tank 12 can be pierced and crushed by the tip 25B1 of the rod 25B.

The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and its operation will be described next.

The operator on board the cab 6 starts the engine and drives the hydraulic pump. In this state, the lower traveling body 2 can be moved forward or backward by operating the traveling operation lever. On the other hand, by operating the operation levers for work (neither of them is shown), the front device 4 can be moved up and down to perform excavation work of earth and sand.

During the operation of the hydraulic excavator 1, the fuel tank device 11 supplies the fuel F in the fuel tank 12 to the engine. Further, in addition to the fuel F, the inside of the fuel tank 12 contains a foreign substance mixed during refueling and a drainage W such as water generated by dew condensation. Therefore, the drainage W settled in the fuel tank 12 needs to be discharged periodically.

Therefore, the drainage work of the drainage W in the fuel tank 12 will be described. As a preparatory work for the drainage work, the operator arranges a drainage receiver (not shown) at a position below the drainage port 18B of the drain hose 18 constituting the drainage line 14. Further, the right side cover 8C of the exterior cover 8 is opened so that the first valve 19 can be operated. In this way, when the preparation work for drainage is completed, the lever 19A of the first valve 19 is tilted in the direction indicated by the arrow to be arranged at the valve opening position. As a result, the drainage W in the fuel tank 12 is discharged from the discharge line 14, that is, the discharge port 12E at the bottom 12A of the fuel tank 12, the insertion hole 15A of the discharge pipe 15, the insertion hole 16A of the connection pipe 16, and the vertical pipe portion 22. It is discharged from the discharge port 18B through the insertion hole 22A of the above, the insertion hole 18A1 of the connection portion 18A of the drain hose 18, and the drain hose 18. Further, even when the first valve 19 is closed, the drainage W can be discharged from the insertion hole 22A of the vertical pipe portion 22 by removing the plug 24 from the relay member 21. In this case, the drainage receiver is arranged below the relay member 21.

Here, in a low temperature environment such as a cold region, the drainage W composed of water and the like accumulated in the bottom portion 12A of the fuel tank 12, the insertion hole 22A of the vertical pipe portion 22, and the insertion hole 15A of the discharge pipe 15 freezes. May solidify. In addition, foreign matter such as sand, dust, and insects mixed during refueling may settle and solidify, blocking the discharge port 12E. In this case, the solidified drainage W acts as a plug and blocks the drainage line 14.

Therefore, the work of removing the solidified drainage W will be described. The plug 24 is removed and the crushing rod 25 is inserted into the insertion hole 22A of the vertical pipe portion 22 of the relay member 21 from below. At this time, by screwing the male screw portion 25A of the crushing rod 25 to the female screw portion 22C of the vertical pipe portion 22, the rod portion 25B of the crushing rod 25 is strongly pressed against the solidified drainage W by the action of the screw mechanism. Can be done. As a result, the drainage W deposited and solidified on the bottom 12A or the like of the fuel tank 12 can be finely crushed by the crushing rod 25. Then, the finely crushed drainage W can be discharged to the outside from the insertion hole 22A of the vertical pipe portion 22 by pulling out the crushing rod 25.

Thus, according to the first embodiment, the discharge pipe 15 and the drain pipe 17 are connected via the relay member 21. The relay member 21 has a vertical pipe portion 22 whose upper end side is connected to the discharge pipe 15 and communicates with the fuel tank 12 and whose lower end side hangs downward, and a plug detachably attached to the lower end side of the vertical pipe portion 22. It consists of 24. On this, the drain pipe 17 is connected to the vertical pipe portion 22 and communicates with the inside of the fuel tank 12.

As a result, the drainage W that has settled on the bottom 12A of the fuel tank 12 can be discharged to the outside through the discharge pipe 15, the relay member 21, and the drain pipe 17. On the other hand, the drainage W of water, foreign matter, etc. that has settled on the bottom 12A of the fuel tank 12 may solidify and block the discharge pipe 15. In this case, the plug 24 is removed from the lower end side of the vertical pipe portion 22, and the crushing rod 25 is inserted into the vertical pipe portion 22 from the lower side to finely crush the drainage W solidified in the fuel tank 12. Then, it can be discharged to the outside from the vertical pipe portion 22.

As a result, foreign matter and frozen drainage W that have settled on the bottom 12A of the fuel tank 12 can be easily removed. As a result, the work efficiency (drainage workability) of discharging the drainage W can be improved.

According to the embodiment, female threaded portions 22B and 22C are provided on the inner peripheral side of the vertical pipe portion 22, and the plug 24 is screwed into the female threaded portion 22C. Therefore, the male threaded portion 24A of the plug 24 can be screwed onto the female threaded portion 22C. As a result, the lower end side of the vertical pipe portion 22 can be closed with the plug 24. Further, by using the female screw portions 22B and 22C as a screw mechanism, the crushing rod 25 can obtain a large pressing force, and the solidified drainage W can be efficiently crushed.

According to the embodiment, the drain pipe 17 includes a drain hose 18 connected to the vertical pipe portion 22 and a first valve 19 provided in the middle of the drain hose 18 to switch the flow and shutoff of the drainage W. Have. Therefore, even at a position away from the fuel tank 12, the drainage W can be discharged by operating the first valve 19. As a result, workability can be further improved.

Next, FIG. 5 shows a second embodiment. The feature of the second embodiment is that the second valve is provided between the discharge pipe and the relay member. In the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 5, the hydraulic excavator 1 according to the second embodiment includes the fuel tank device 31 at the same position as the fuel tank device 11 of the first embodiment. The fuel tank device 31 includes a fuel tank 12, a discharge line 32, and a supply line (not shown). The discharge line 32 is connected to the bottom 12A of the fuel tank 12. The discharge line 32 includes a connecting pipe 33 and a second valve 34.

The connection pipe 33 is provided connected to the bottom 12A of the fuel tank 12 via the discharge pipe 15. The second valve 34 is provided between the discharge pipe 15 and the relay member 21 (a portion in the middle of the connecting pipe 33). The second valve 34 is configured as a flat lever type ball valve having a lever 34A, similarly to the first valve 19 according to the first embodiment.

According to the second embodiment, in addition to the effects of the first embodiment described above, there are the following effects. In the drainage work of the drainage W, the drainage W in the relay member 21 and the drain pipe 17 is discharged by closing the second valve 34 and opening the first valve 19 after the work is completed. This makes it possible to prevent the drainage W from freezing in the relay member 21 and the drain pipe 17.

In the first embodiment, a case where a crushing rod 25 having a male screw portion 25A is used to crush the drainage W of fixed (frozen) water, foreign matter, etc. has been described as an example. However, the present invention is not limited to this, and for example, a crushing rod not provided with a male screw portion may be used. This also applies to the second embodiment.

In the first embodiment, a horizontal pipe portion 23 is provided in the middle portion of the vertical pipe portion 22 constituting the relay member 21 in the lateral direction orthogonal to the length direction, and the horizontal pipe portion 23 is provided. The case where the female threaded portion 23A is formed on the inner peripheral side of the above and the male threaded portion 18A2 of the connecting portion 18A of the drain hose 18 is screwed to the female threaded portion 23A has been described as an example. However, the present invention is not limited to this configuration, and a female screw portion is formed in the middle portion in the length direction of the vertical pipe portion in the horizontal direction orthogonal to the length direction, and a drain pipe is screwed to this female screw portion. It may be configured. In this case, the horizontal pipe portion can be omitted. This configuration can be similarly applied to the second embodiment.

In the first embodiment, the first valve 19 is configured as a manual valve having a lever 19A, and in the second embodiment, the second valve 34 is configured as a manual valve having a lever 34A. I mentioned and explained in. However, the present invention is not limited to this, and for example, in the first embodiment, the first valve 19 may be a remote type electromagnetic on-off valve. Further, in the second embodiment, at least one valve of the first valve 19 and the second valve 34 may be a remote type electromagnetic on-off valve.

In each embodiment, a case where a discharge pipe 15 is provided at the bottom 12A of the fuel tank 12 as an oil storage tank has been described as an example. However, the present invention is not limited to this, and can be applied to other oil storage tanks such as hydraulic oil tanks in addition to fuel tanks.

Further, in each embodiment, the hydraulic excavator 1 is illustrated as a construction machine. However, the present invention is not limited to this, and can be widely applied to various construction machines such as hydraulic cranes and wheel loaders. Further, it is needless to say that each embodiment is an example, and partial replacement or combination of the configurations shown in different embodiments is possible.

1 Hydraulic excavator (construction machinery)
2 Lower running body (body)
3 Upper swivel body (body)
12 Fuel tank (oil storage tank)
12A Bottom 15 Drain pipe 17 Drain pipe 18 Drain hose 19 First valve 21 Relay member 22 Vertical pipe part 22B, 22C Female thread part 24 Plug 34 Second valve F Fuel (oil liquid)
W drainage

Claims (4)

An oil storage tank that stores oil liquid inside,
A discharge pipe provided at the bottom of the oil storage tank and communicating with the inside of the oil storage tank,
In a construction machine provided with a drain pipe connected to the discharge pipe and for draining the drainage liquid settled inside the oil storage tank to the outside.
The discharge pipe and the drain pipe are connected to each other via a relay member.
The relay member
A vertical pipe portion whose upper end side is connected to the discharge pipe and communicates with the oil storage tank, and whose lower end side hangs downward.
It consists of a plug that is detachably attached to the lower end side of the vertical pipe portion.
A construction machine characterized in that the drain pipe is connected to the vertical pipe portion and communicates with the inside of the oil storage tank. In the construction machine according to claim 1,
A female screw portion is provided on the inner peripheral side of the vertical pipe portion.
The plug is a construction machine characterized in that it is screwed into the female thread portion. In the construction machine according to claim 1,
The drain pipe is a construction machine having a drain hose connected to the vertical pipe portion and a first valve provided in the middle of the drain hose to switch the flow and shutoff of the drainage liquid. In the construction machine according to claim 3,
A construction machine characterized in that a second valve for switching between the flow and cutoff of the drainage liquid is provided between the discharge pipe and the relay member.

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