JP2011173590A - Working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working machine which has a fuel supply device superior in foreign matter removing performance, and relatively easily performs fuel filling work. <P>SOLUTION: This working machine such as a hydraulic excavator includes the fuel supply device 15 for supplying fuel to a fuel tank 6 at a work site. The fuel supply device 15 includes a fuel hose 26, a fuel pump 27 and a filtering device 28. The filtering device 28 includes a first filter 35 for replaceably storing a filter 45 and a pump stopping control device 37 for stopping the fuel pump 27 when a measured value of a pressure sensor 36 exceeds a predetermined value. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a work machine such as a hydraulic excavator, and more particularly to a fuel supply device mounted on the work machine.

  This type of work machine includes a work machine provided with a fuel supply device so that fuel can be directly supplied from a drum or the like at a work site (Patent Documents 1 to 4).

  For example, Patent Document 1 includes a fuel supply device including a long hose with a strainer attached to the front end of a fuel tank, a pump connected to the hose, and a pump on / off switch. A fuel supply device in which a refueling device is housed in a storage case is disclosed.

  In Patent Document 2, the hose is shortened and fitted into a concave groove provided on the side surface of the fuel tank so that the hose can be stored in the extended state so that the hose does not need to be rounded or stretched during refueling work. A fuel supply apparatus is disclosed.

  Patent Document 3 and Patent Document 4 disclose a fuel supply device that is installed below a staircase provided on a machine cover or below a fuel tank so as not to get in the way.

JP 2002-266377 A JP 2008-196234 A JP 2008-095326 A JP 2008-195345 A

  When refueling at a work site, for example, it may be necessary to use a poor fuel in which a large amount of fine foreign matters are mixed. Therefore, in the fuel supply devices of Patent Literature 1 and Patent Literature 2, a strainer is attached to the tip of the hose, and foreign matter is removed by the strainer.

  However, in the case of a long hose as in Patent Document 1, when the hole diameter of the strainer is reduced in order to improve the foreign matter removal performance, the suction force of the pump is insufficient and it takes time to suck the fuel. There is a risk of clogging immediately, making it impossible to refuel. If the strainer is made larger, it can be improved, but if the strainer is made larger, the workability becomes worse.

  In that respect, if the hose is short as in Patent Document 2, the shortage of the suction force of the pump is somewhat reduced compared to the long hose, but the strainer is easily clogged. Drums etc. must be transported to the place where the oil reaches.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a working machine that is excellent in the performance of removing foreign matters contained in fuel and that can perform refueling work relatively easily.

  In order to achieve the above object, in the present invention, a filter device for filtering fuel is provided in the fuel supply device, and the fuel pump is stopped when the internal pressure of the filter device reaches a predetermined value.

  Specifically, the working machine is provided with an upper support on the lower traveling body, and the upper support is provided with a fuel tank and a fuel supply device for supplying fuel to the fuel tank, A fuel supply device having a drawable fuel hose, a fuel pump for feeding fuel, and a filter device for filtering the fuel, wherein the filter device replaceably accommodates a filter; The pressure sensor includes a pressure sensor that measures a change in internal pressure of the first filter, and a pump stop control unit that stops the fuel pump when a measured value of the pressure sensor reaches a predetermined value.

  Then, even if the filter is clogged and the fuel cannot be supplied, it is possible to simply restart the fuel supply simply by replacing the filter. If the filter is clogged, the internal pressure of the first filter greatly changes, and the change time of the filter can be accurately determined by measuring the internal pressure change with the pressure sensor. When the measured value of the pressure sensor becomes a predetermined value indicating the clogging of the filter, the pump stop control means automatically stops the fuel pump, so that the fuel supply operation can be performed with peace of mind.

  Specifically, it is preferable that the fuel hose is connected to the suction port side of the fuel pump, and the filtering device is connected between the discharge port of the fuel pump and the fuel tank.

  In this case, the fuel hose is connected to the fuel pump suction port side, and the filtering device is connected to the fuel pump discharge port side. However, the liquid can be fed to the fuel pump without generating an extra load, and the suction force of the fuel pump can be kept short.

  And since the filtration device is connected between the discharge port of the fuel pump and the fuel tank, the discharge pressure of the fuel pump can be efficiently applied to the filtration device, and the filtration performance of the filtration device can be effectively increased accordingly. It can be demonstrated.

  Furthermore, a residual liquid outlet that can be opened and closed is provided at the lower end of the first filter, and a residual liquid passage that guides residual liquid flowing out from the residual liquid outlet to the outside of the upper support is provided. It is good to keep it.

  Then, when replacing the filter, if the residual liquid outlet is opened, the fuel remaining in the first filter can be discharged to the outside of the upper support through the residual liquid flow path. The filter can be easily replaced and the inside of the storage case can be prevented from being contaminated with fuel.

  Further, a hydraulic oil tank for storing hydraulic oil and a second filter for filtering the hydraulic oil are further provided on the upper support, and the filter is accommodated in the second filter in a replaceable manner. It is preferable that the filter of the first filter and the filter of the second filter can be shared.

  By doing so, it is not necessary to separately provide a spare filter, which is convenient.

  A storage case for storing equipment is provided in the vicinity of the fuel tank, and the fuel hose, the fuel pump, and the filtration device are disposed in the storage case so as to be close to each other. It is good to be.

  Then, since the fuel supply device is compactly installed in the storage case, the inside of the storage case is narrowed with the fuel supply device installed, but the limited space can be used efficiently and relatively large equipment Can also be accommodated, and does not interfere with the removal and installation of equipment.

  In this case, if the fuel supply device is installed on the support plate attached to the upper support and unitized, it can be easily incorporated into an existing excavator as long as it can be accommodated in the storage case, and is not necessary. In this case, it can be removed and is excellent in versatility.

  As described above, according to the working machine of the present invention, the fuel supply device that is excellent in the removal performance of the foreign matters contained in the fuel and can perform the refueling work relatively easily is provided. , You can always supply fuel with stable quality and refuel with confidence.

It is a perspective view showing the whole work machine to which the present invention is applied. It is a perspective view which shows the principal part of the working machine to which this invention is applied. It is a perspective view which shows the inside of a storage case. It is a perspective view which shows a fuel supply apparatus unit. It is a schematic sectional drawing which shows the inside of a storage case. It is a schematic perspective view which shows the back surface side of a fuel supply apparatus unit.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows a hydraulic excavator (work machine) to which the present invention is applied. This hydraulic excavator is provided with an upper swing body 2 (upper support) on a crawler type lower traveling body 1 so that the upper swing body 2 can swing, and on the frame of the upper swing body 2, a cab 3 and an attachment 4, An engine chamber 5, a fuel tank 6, a hydraulic oil tank 7, a storage case 8, and the like are provided. The directions such as front and rear and left and right will be described with reference to a hydraulic excavator in the basic posture of FIG.

  The cab 3 is an operator box having a vertically long box shape disposed in the left front portion of the upper swing body 2. A relatively large window 10 is provided on the front and rear surfaces and the left and right sides of the cab 3. Is equipped with a seat and operation equipment. An attachment 4 is disposed at an intermediate portion of the front portion of the upper swing body 2 in the left-right direction so as to be adjacent to the right side surface of the cab 3.

  The attachment 4 has a substantially square-shaped boom 11 supported by the frame of the upper swing body 2 so as to be raised and lowered, and extends in the longitudinal direction of the boom 11, and a base end portion thereof is provided at a distal end portion of the boom 11. The arm 12 is supported so as to be rotatable around the first horizontal axis, and the bucket 13 is provided at the tip of the arm 12 so as to be rotatable around the second horizontal axis.

  The engine room 5 is disposed between the left and right sides of the rear part of the upper swing body 2, and an engine, a radiator, a hydraulic pump, and the like are mounted in the engine room 5 although not shown.

  The storage case 8, the fuel tank 6, and the hydraulic oil tank 7 are disposed at the right front portion of the upper swing body 2 so as to face the cab 3 on the left and right sides with the attachment 4 interposed therebetween. Specifically, the fuel tank 6 and the like are assembled on the right side portion (also referred to as a side frame 2a) of the frame of the upper swing body 2. FIG. 2 shows a right front portion of the upper swing body 2. The storage case 8, the fuel tank 6, and the hydraulic oil tank 7 are arranged in a line from the front side in this order.

  The hydraulic oil tank 7 is a square box type tank disposed so as to be in contact with the right front portion of the engine chamber 5, and stores hydraulic oil supplied to the hydraulic system therein. As shown by a broken line in FIG. 2, a filter 14 (second filter) for filtering the hydraulic oil is provided inside the hydraulic oil tank 7, and the filter 14 a is accommodated therein in a replaceable manner. Has been.

  On the other hand, the fuel tank 6 is a rectangular box tank having a capacity larger than that of the hydraulic oil tank 7 disposed so as to be in contact with the front surface of the hydraulic oil tank 7, and fuel to be supplied to the engine is stored in the tank. It has come to be. Except for the point that the front and rear dimensions of the fuel tank 6 are larger than those of the hydraulic oil tank 7, the top and bottom and left and right dimensions are substantially the same. Has been.

  The storage case 8 is provided so as to be able to store equipment such as a pail can containing engine oil or a spare filter, and is disposed so as to contact the front surface of the fuel tank 6. As shown in FIG. 3, a fuel supply device 15 for supplying fuel to the fuel tank 6 is disposed inside the storage case 8 (this fuel supply device 15 will be described later).

  The storage case 8 includes a rectangular box-shaped case body 18 having dimensions in the front and rear and left and right directions that are substantially the same as those of the fuel tank 6, and a vertical dimension that is substantially half of the fuel tank 6. And a cover body 19 erected so as to extend upward from the side to the left and right of the case main body 18.

  As shown in FIG. 3, the case body 18 includes a pair of left and right side wall portions 18a, 18a, a front wall portion 18b continuous between the front ends of the side wall portions 18a, 18a, both side wall portions 18a, 18a, and a front wall portion 18b. And an upper wall portion 18 c that covers the upper surface of the case body 18. An opening 18d is cut out at the rear end of the upper wall portion 18c, and a cover body 19 is provided so as to rise from around the opening 18d. The upper wall portion 18c is provided with an opening / closing door 20 that is swingably supported (see FIGS. 2 and 5).

  The cover body 19 includes a front cover portion 19a and side cover portions 19b connected to the left and right sides and the upper side of the front cover portion 19a. The lower ends of the front cover portion 19a and the side cover portion 19b are the upper walls of the case body 18. It is joined to the rear end of the portion 18c. The front surface of the fuel tank 6 is covered with the cover body 19 and the rear portion of the case body 18, so that an arrangement space for various devices is formed on the front side of the fuel tank 6.

  The storage case 8 is located at the front corner of the side frame 2a, and a step 21 is provided on the front side of the front corner of the side frame 2a, that is, the front lower side of the storage case 8 so as to protrude forward. ing. A handrail 22 formed of a pipe is provided between the front right corner of the upper surface of the fuel tank 6 and the front right corner of the upper wall portion 18c of the storage case 8. That is, the step 21, the storage case 8, and the fuel tank 6 are also raised and lowered steps, so that the operator can easily go up and down on the fuel tank 6 and the hydraulic oil tank 7 by grasping the handrail 22. .

  As shown in FIG. 4, the fuel supply device 15 is configured as one unit in which main members are assembled in advance on a support plate 25 (fuel supply device unit), and a fuel hose 26, a fuel pump 27, A filtering device 28 and the like are provided.

The support plate 25 is a pressed product of a steel plate, and has a square plate-like base portion 25a and leg wall portions 25b formed by bending downward each of the four side end portions of the base portion 25a. The case body 18 is formed to be slightly smaller than the front and rear and left and right inner dimensions.

  The support plate 25 is detachably fastened to the front corner of the side frame 2a with bolts B, and the storage case 8 is detachably attached to the side frame 2a so as to cover the support plate 25. That is, the bottom surface of the storage case 8 is defined by the support plate 25.

  The upper surface of the support plate 25, as shown by a two-dot chain line in FIG. 4, is an area 25c (equipment storage area) for storing equipment and an area 25d (apparatus installation) for installing the fuel supply device 15. The fuel hose 26, the fuel pump 27, and the filtration device 28 are arranged compactly in the device installation region 25d so as to be close to each other. In the present embodiment, the device installation area 25 d is provided on the right side of the support plate 25, and the equipment storage area 25 c is provided on the left side of the support plate 25. Therefore, although the inside of the storage case 8 is narrowed by the fuel supply device 15 being installed, the limited space is efficiently used, so even a relatively large equipment such as a pail can may be hindered. It can be accommodated without any problems.

  The fuel hose 26 is a relatively long hose that is several meters long when extended, and is excellent in flexibility. A strainer 29 is attached to the tip of the hose 26 to remove relatively large foreign matter. The base end portion is directly connected to the fuel pump 27 in this embodiment.

  In order to easily store such a fuel hose 26, the fuel supply device 15 includes a fuel hose storage tool 30 including a hose storage portion 30 a and a strainer storage portion 30 b at the edge of the right end of the support plate 25. It is arranged along.

  The hose storage part 30a is a box-shaped container formed relatively larger in the front-rear direction and the up-down direction than in the left-right direction, and its upper surface is open. Therefore, if the fuel hose 26 is appropriately rolled and inserted into the hose storage part 30a from above, the fuel hose 26 can be easily stored.

  The strainer storage part 30b is a vertically long bottomed cylindrical container that is attached to one side surface of the hose storage part 30a so that the strainer 29 at the tip of the fuel hose 26 stored in the hose storage part 30a can be inserted and stored. It has become. A drainage pipe 31 is connected to the bottom surface of the strainer storage portion 30b so that fuel remaining in the strainer 29 during storage does not accumulate in the strainer storage portion 30b. The lower end of the drainage pipe 31 is connected to a through hole formed in the support plate 25.

  The fuel pump 27 is a comparatively small horizontally long electric pump, and is disposed so as to extend in the front-rear direction in the device installation region 25 d near the left front portion of the fuel hose housing 30. In the pump portion of the fuel pump 27, a suction port 27a for sucking fuel and a discharge port 27b for discharging fuel are provided side by side in a state of facing upward, and a fuel hose 26 is provided in the suction port 27a. The base end portion of the relay hose 32 is connected, and one end of a relatively short relay hose 32 is connected to the discharge port 27b. A protection frame 33 for protecting the fuel pump 27 is attached to the left side of the fuel pump 27.

  The filtration device 28 includes a first filter 35, a pressure sensor 36, a pump stop control device 37 (pump stop control means), and the like, and the main components thereof are in the device installation region 25d near the left rear portion of the fuel hose storage tool 30. The fuel pump 27 is disposed adjacent to the front and rear.

  The first filter 35 is a pressure vessel having a bottomed cylindrical container body 35a and a lid 35b that closes the upper opening of the container body 35a. The lid 35b is external to the upper edge of the container body 35a. It is fastened to the flange part 35c projecting in the direction so as to be removable with bolts. The other end of the relay hose 32 is connected to the upper part of the container body 35a, and the fuel is supplied to the first filter 35 therefrom. The first filter 35 is supported at a position away from the support plate 25 by a predetermined distance by a support frame 38 fixed to the support plate 25.

  A tubular residual liquid outflow pipe 39 is provided at the lower end of the container main body 35a so as to protrude downward, and the base end of the residual liquid outflow pipe 39 is formed on the bottom surface of the container main body 35a. Connected to the residual liquid outlet 40, the distal end of the residual liquid outlet pipe 39 can be opened and closed by a plug 41.

  Further, as shown in FIG. 5, a fuel outflow portion 42 through which the fuel filtered by the first filter 35 flows out is provided at the lower end of the container body 35a, and communicates with the upper portion of the fuel tank 6 there. A fuel pipe 43 is connected.

  As shown in FIG. 4, the first filter 35 accommodates a filter 45 that can remove relatively fine foreign substances contained in the fuel in a replaceable manner. The filter 45 is, for example, a filter configured to allow filtration even when the amount of foreign matter is somewhat large, such as a depth filter, and is set so that the foreign matter can be removed in a balanced manner while suppressing clogging in combination with the strainer 29. Has been.

  The filter 45 is the same as the filter 14a of the second filter 14 provided in the hydraulic oil tank 7, and can be shared with each other. Therefore, it is not necessary to provide a spare filter separately, which is convenient.

  The pressure sensor 36 is provided on the wall surface of the container main body 35a in order to measure the internal pressure of the first filter 35 (the pressure on the primary side of the filter 45 in this embodiment), and the pressure value measured by the pressure sensor 36. Is configured to be continuously input to the pump stop control device 37.

  The pump stop control device 37 is disposed on the upper side of the fuel pump 27, in which a control program is mounted together with various electrical components such as the electrical wiring of the fuel pump 27 and CPU, ROM, etc. A function of comparing the input pressure value with a threshold value set in advance according to the filter 45 and stopping the fuel pump 27 when the pressure value exceeds the threshold value is provided.

  A remaining liquid receiving portion 46 is provided at a portion of the support plate 25 facing the lower end portion of the container main body 35a so that the remaining liquid of the fuel flowing out from the remaining liquid outflow pipe 39 does not flow and spread. The residual liquid receiving portion 46 is formed in a tray shape with a frame surrounding the periphery and a part of the support plate 25 surrounded by the frame, and a part of the support plate 25 defining the bottom surface thereof. A through-hole 46a is formed in this.

On the back surface of the support plate 25, as shown in FIG. 6, there is provided a substantially sealed cylindrical flange 47 whose one end covers the through hole 46 a and the other end extends to the end of the support plate 25. It has been. The flange portion 47 has a strip-like bottom plate 47 a and a pair of side plates connected to both sides of the bottom plate 47 a and is integrally fixed to the back surface of the support plate 25. The bottom plate 47a is inclined downward from one end side to the other end side so that the other end side is located below the one end side with the through hole 46a. A drain outflow hole 48 is opened at the other end of the bottom plate 47a located at the lowest position, and a drain hose 49 that can be led out to the outside of the upper swing body 2 is connected thereto. In addition, the drainage pipe 31 connected to the bottom surface of the strainer storage portion 30b is arranged to communicate with the flange portion 47.

  The dimension from the back surface of the support plate 25 to the lowest part of the flange part 47 is set smaller than the projecting dimension of the leg wall part 25b of the support plate 25. Even if the support plate 25 is placed on a plane, the flange part 47 does not abut, so that the flange 47 does not get in the way when attached to the side frame 2a. Projecting from the four corners of the back surface of the support plate 25 are bosses 50 that support and guide the bolts B fastened to the side frames 2a.

  The hydraulic excavator provided with such a fuel supply device 15 directly supplies the fuel from the drum can or the like with a simple operation without worrying about the quality of the fuel when it becomes necessary to replenish the fuel at the work site. Can be supplied to.

  That is, as shown in FIG. 5, first, the opening / closing door 20 of the storage case 8 is opened and the fuel hose 26 is pulled out of the storage case 8. Then, the fuel can be fed to the fuel tank 6 by inserting the tip of the fuel hose 26 into the drum can and driving the fuel pump 27. If the fuel hose 26 is extended, oil can be supplied even if the drum can is located at some distance, so that workability is excellent.

  At that time, the relatively large foreign matter is removed by the strainer 29, and the fine foreign matter passing through the strainer 29 can be surely removed by the filtering device 28, so that the foreign matter contained in the fuel can be effectively removed. (Two-stage filtration). Even if the fuel contains a large amount of foreign matter, the strainer 29 and the filter 45 can remove the foreign matter in a well-balanced manner, so that the shortage of the suction force of the fuel pump 27 can be reduced, and fuel can be supplied without trouble for a long time. can do.

  Even if the fuel hose 26 is long, liquid can be fed up to the fuel pump 27 without generating an extra load, so that the suction force of the fuel pump 27 does not become insufficient.

  A filtration device 28 is connected between the discharge port 27b of the fuel pump 27 and the fuel tank 6 so that the discharge pressure of the fuel pump 27 can be applied to the filtration device 28 efficiently. The filtering performance of the filter 45 can be exhibited effectively, and the clogging of the filter 45 by the pressure sensor 36 can be easily detected.

  After completion of the refueling operation, the fuel hose 26 may be rolled up and stored in the fuel hose storage tool 30. Since the remaining liquid of the fuel is also discharged, the inside of the storage case 8 is not soiled.

  When the pressure sensor 36 detects clogging of the filter 45, the fuel pump 27 is stopped by the pump stop control device 37.

  In such a case, the filter 45 needs to be replaced, but the filter 45 can be easily replaced without being contaminated.

  That is, the operator loosens the plug 41 at the tip of the residual liquid outflow pipe 39 provided in the first filter 35 and opens the residual liquid outlet 40. Then, if the lid 35b is removed from the container body 35a, the fuel remaining in the first filter 35 flows into the flow path (residual portion) including the residual liquid outflow pipe 39, the flange 47, and the drain hose 49. Through the liquid flow path), the storage case 8 can be collected without being contaminated. The fuel remaining in the strainer 29 can also be recovered via the drainage pipe 31, the flange 47 and the drain hose 49.

When there is no fuel remaining in the first filter 35, the filter 45 may be removed and replaced with a spare filter. Since the spare filter can also be shared with the filter 14a of the hydraulic oil tank 7, the spare filter can be efficiently prepared, which is excellent in convenience. In an emergency, the filter 14a of the hydraulic oil tank 7 can be substituted.

  Since the fuel supply device 15 is unitized on the support plate 25 and the support plate 25 can be easily assembled to the storage case 8, the versatility is also excellent. For example, as long as the fuel supply unit can be accommodated in the storage case 8, it can be easily incorporated into an existing hydraulic excavator.

  The work machine according to the present invention is not limited to the above-described embodiment, and includes various other configurations.

  For example, the device installation area 25 d on the support plate 25 may be partitioned along the periphery of the support plate 25. A partition wall may be provided in the storage case 8 to partition the device installation space and the equipment storage space. This makes it easier to store the equipment and further protects the fuel supply device 15. The collar portion 47 may be formed of a pipe. Further, the drain hose 49 is not always necessary.

1 Lower traveling body 2 Upper turning body (upper support)
3 Cab 4 Attachment 5 Engine chamber 6 Fuel tank 7 Hydraulic oil tank 8 Storage case 14 Second filter 14a Filter 15 Fuel supply device 18 Case body 19 Cover body 20 Open / close door 25 Support plate 25a Base portion 25b Leg wall portion 25c Equipment storage Region 25d Device installation region 26 Fuel hose 27 Fuel pump 27a Suction port 27b Discharge port 28 Filtration device 29 Strainer 30 Fuel hose storage device 30a Hose storage unit 30b Strainer storage unit 31 Drain pipe 32 Relay hose 35 First filter 36 Pressure sensor 37 Pump stop control device 39 Residual liquid outlet pipe 40 Residual liquid outlet 43 Fuel pipe 45 Filter 46 Residual liquid receiving part 47 Fence part 48 Drain outlet hole 49 Drain hose

Claims (5)

A working machine provided with an upper support on a lower traveling body, and provided with a fuel tank and a fuel supply device for supplying fuel to the fuel tank.
The fuel supply device has a drawable fuel hose, a fuel pump for feeding fuel, and a filtration device for filtering fuel,
The filter device includes a first filter that accommodates a filter in a replaceable manner, a pressure sensor that measures a change in internal pressure of the first filter, and stops the fuel pump when a measured value of the pressure sensor reaches a predetermined value. And a pump stop control means. The work machine according to claim 1,
The working machine, wherein the fuel hose is connected to a suction port side of the fuel pump, and the filtering device is connected between a discharge port of the fuel pump and the fuel tank. The work machine according to claim 1 or 2,
A residual liquid outlet that can be opened and closed is provided at the lower end of the first filter,
A working machine comprising a residual liquid flow path for guiding the residual liquid flowing out from the residual liquid outlet to the outside of the upper support. A working machine according to any one of claims 1 to 3,
A hydraulic oil tank for storing hydraulic oil and a second filter for filtering the hydraulic oil are further provided on the upper support.
A working machine characterized in that a filter is replaceably accommodated in the second filter, and the filter of the first filter and the filter of the second filter can be shared. A working machine according to any one of claims 1 to 4,
A storage case for storing equipment is provided in the vicinity of the fuel tank,
A working machine, wherein the fuel hose, the fuel pump, and the filtering device are disposed in the storage case so as to be close to each other.

Images