JP6884733B2 - Remote-controlled small hydraulic excavator - Google Patents

Description

The present invention relates to a remote-operated small hydraulic excavator constructed based on an existing hydraulic excavator, and in particular, a remote-operated small hydraulic excavator that can be easily configured by utilizing the existing hydraulic excavator configuration and has excellent maintainability of a prime mover or the like. Related.

For example, at a disaster recovery site where rubble, earth and stone, driftwood, etc. are scattered, there are various obstacles in the movement route to the work place. A compact hydraulic excavator with high versatility is useful in the field where there are various obstacles. In particular, there are many demands for a rear small turning type hydraulic excavator (see Patent Document 1 and the like) in which the turning radius at the rear end of the turning body is suppressed to a dimension equivalent to the vehicle width of the traveling body.

Japanese Unexamined Patent Publication No. 2015-221591

At disaster recovery sites, etc., it is necessary to suppress the occurrence of secondary disasters, and since there are areas where operators are restricted from entering, a hydraulic excavator that can be operated remotely is required. However, small hydraulic excavators manufactured as remote-controlled machines from the design stage are not always easy to procure quickly in the event of disaster recovery because the number of excavators in circulation is small and expensive.

Therefore, it is conceivable to manufacture a remote-controlled machine based on a general small hydraulic excavator that the operator boarded and operated. At that time, from the viewpoint of quick introduction to the disaster recovery site, it is important to utilize the existing hydraulic excavator configuration and repair it to a remote control specification machine in the simplest process possible. In addition, the operating rate is also important to contribute to quick disaster recovery, and it is necessary to consider the work efficiency of maintenance of prime movers, etc. in order to maintain a high operating rate.

An object of the present invention is to provide a remote-controlled compact hydraulic excavator that can be easily configured by utilizing the configuration of an existing hydraulic excavator and has excellent maintainability of a prime mover or the like.

In order to achieve the above object, the present invention is provided on a traveling body, a swivel frame provided on the upper part of the traveling body so as to be swivel, a working machine attached to the front portion of the swivel frame, and a rear portion of the swivel frame. Controls the flow of pressure oil from the hydraulic pump, the prime mover for driving the hydraulic pump, the machine room provided at the rear of the swivel frame and accommodating the hydraulic pump and the prime mover, and the corresponding hydraulic actuator. Remotely operated compact size equipped with a plurality of control valves, a plurality of electromagnetic valves for controlling the hydraulic oil for driving the control valves, and a controller box containing a controller for controlling the electromagnetic valves in response to a signal from a wireless operating device. The hydraulic excavator includes a slide rail provided in the upper part of the machine chamber, and the controller box is slidably provided in the upper part of the machine chamber via the slide rail in the upper part of the machine chamber. It is characterized in that the maintenance opening provided in the upper part of the machine room is opened by sliding from the machine room.

For equipment that is not related to the operator's boarding operation, such as a traveling body, a turning frame, a working machine, a hydraulic pump, a prime mover, a machine room, and a control valve, those of the base machine can be used. In the hydraulic excavator according to the present invention, a solenoid valve for controlling the control valve and a controller for controlling the solenoid valve are newly provided. In particular, since the controller box is slidably arranged in the upper part of the machine room, the controller box can be slid and moved to open the maintenance opening on the upper surface of the machine room. According to the present invention, a remote-controlled compact hydraulic excavator having excellent maintainability of a prime mover or the like can be easily configured by utilizing the configuration of an existing hydraulic excavator.

Side view of a remote-controlled compact hydraulic excavator according to an embodiment of the present invention. Rear view of the hydraulic excavator of FIG. 1 as viewed from the rear. A perspective view of the entire configuration of the swivel body of the hydraulic excavator of FIG. 1 as viewed from the front left. A plan view showing a state in which the floor panel of the swivel body of FIG. 3 is removed. A perspective view of the swivel body in FIG. 3 with the floor panel removed from the front left. A perspective view of the swivel body of FIG. 3 with the floor panel, front panel, and side panel removed from the front left. The figure which shows the state which mounted the camera device on the hydraulic excavator of FIG. A plan view showing a state in which the controller box of the swivel body of FIG. 3 is slid (a state in which the maintenance opening is closed). A plan view showing a state in which the controller box of the swivel body of FIG. 3 is slid (a state in which the maintenance opening is open). A perspective view of the swivel body shown in FIG. 9 as viewed from the rear left.

Embodiments of the present invention will be described below with reference to the drawings.

-Remotely operated small hydraulic excavator-
FIG. 1 is a side view of a remote-controlled compact hydraulic excavator according to an embodiment of the present invention, and FIG. 2 is a rear view seen from the rear. In the specification of the present application, the left and right sides of FIG. 1 are referred to as front and back. The remote-controlled small hydraulic excavator shown in FIGS. 1 and 2 is a machine modified into a remote-controlled specification machine based on a so-called rear ultra-small swivel machine on which an operator is boarded and operated. All the elements explained in the columns of "-running body", "-swivel body-", and "-working machine-" described later are diverted from those of the base machine except for the floor panel 25, and the arrangement is also in the base machine. Same as placement. The rear small swivel machine is a flood control excavator designed so that the rear end swivel diameter is about the same as the total width of the traveling body (120% or less of the total width of the crawler) assuming work in a narrow site. is there. In the following description in the present specification, the remote-controlled small hydraulic excavator is abbreviated as a hydraulic excavator, and when the term "hydraulic excavator" is used without particular notice, it refers to the remote-controlled small hydraulic excavator according to the present embodiment. And. The hydraulic excavator includes a traveling body 10, a swivel body 20, and a working machine 40.

-Running body-
The traveling body 10 includes left and right traveling devices 11 and a center frame 12 (FIG. 2). The left and right traveling devices 11 are crawler type, and include a side frame 11a, a driven wheel 11b, a driving wheel 11c, a traveling motor (not shown), a speed reducer 11e, and a track 11f, respectively. The left and right side frames 11a extend in the traveling direction (left-right direction in FIG. 1), and support the driven wheel 11b on one side (left side in FIG. 1) in the longitudinal direction and the drive wheel 11c on the other side (right side in FIG. 1). doing. The traveling motor is supported on the other side of the left and right side frames 11a in the longitudinal direction, and the output shaft is connected to the drive wheels 11c via the speed reducer 11e. The track 11f is hung between the driven wheel 11b and the driving wheel 11c in each of the left and right traveling devices 11. When the traveling motor is driven, rotational power is transmitted to the drive wheels 11c via the speed reducer 11e, and the track 11f is circulated and driven between the drive wheels 11c and the driven wheels 11b.

The center frame 12 connects the left and right traveling devices 11 (side frames 11a) and supports the swivel body 20 on the upper portion. The center frame 12 and the left and right side frames 11a form a frame of the traveling body 10, that is, a track frame. The center frame 12 is provided with a soil removal device 13. The soil removal device 13 is connected to one side (left side in FIG. 1) of the center frame 12 in the traveling direction. The soil removal device 13 includes a blade elevating cylinder (not shown) and a blade 13b, and the blade 13b moves up and down via a link mechanism as the blade elevating cylinder expands and contracts. Although detailed description is omitted, the center frame 12 has a structure in which the left and right widths are variable, and as shown by the alternate long and short dash line in FIG. 2, the distance between the left and right traveling devices 11 extends the hydraulic cylinder (not shown). It is possible to expand by doing so. The total width of the traveling body described at the beginning of the present embodiment is the total width in a state where the distance between the left and right traveling devices 11 is the widest. The hydraulic excavator can pass between obstacles with a narrow space while the distance between the left and right traveling devices 11 is narrowed, while the distance between the left and right traveling devices 11 is widened to improve the stability of the machine during work and the like. be able to.

-Swivel body-
The swivel body 20 includes a swivel frame 21 (FIG. 6), a counterweight 22, a seat base 23, a driver's seat 24, a floor panel 25, and the like. The swivel frame 21 is a basic support structure of the swivel body 20, and is provided so as to be swivelable on the upper portion of the traveling body 10 via the swivel wheels 26. A seat base 23 is arranged in the rear area on the swivel frame 21. The seat base 23 is a member that supported the driver's seat in the base machine of the hydraulic excavator, and at the same time also serves as a machine room (engine cover). The outer circumference of the seat base 23 is covered with an exterior cover 28. The counter weight 22 is a weight for balancing with the working machine 40, and is provided at the trailing edge of the swivel frame 21. The turning radius of the trailing edge of the counterweight 22 is the rear turning diameter of the hydraulic excavator. However, the hydraulic excavator of this embodiment is a small model, and the rear turning diameter is suppressed to about half the vehicle width of the traveling body 10. There is.

The internal space of the seat base 23 is divided into front and rear, and the space behind the hydraulic pump (not shown), the pilot pump (same as above), and the engine 29 (see the broken line in FIG. 1) that drives these pumps. Is housed in. In the present embodiment, the case where the engine 29 (internal combustion engine) is used as the prime mover for driving the hydraulic pump or the pilot pump is illustrated, but an electric motor can be adopted instead of the engine 29. Although it was removed in the hydraulic excavator of this example, the driver's seat was laid out above the engine 29 in the base machine. On the other hand, electric devices such as relays and fuses are housed in the space on the front side in the seat base 23. On the front surface of the seat base 23, an opening / closing lid 23a for opening and closing the space on the front side accommodating the electronic device is provided (FIGS. 3 and 6).

A hydraulic oil tank and a fuel tank (both not shown) are mounted on the other side (right side in this example) of the front portion of the swivel frame 21 in the left-right direction, and these are covered with a tank cover 27. The hydraulic oil stored in the hydraulic oil tank is discharged from the hydraulic pump or pilot pump, and the hydraulic actuator (boom cylinder 45 or the like) or control valve unit 36 (described later) is driven. Further, a bracket 31 for attaching the work machine 40 is provided on the front portion of the swivel frame 21 (the space on the front side of the seat base 23). The bracket 31 extends forward and backward at the front portion of the swivel frame 21, and the front end projects forward from the swivel frame 21 to partition the space at the front portion of the swivel frame 21 to the left and right (FIG. 6). A swing post 37 is connected to the bracket 31 via a vertical shaft. The swing post 37 is rotationally driven left and right by the swing cylinder 35 (FIG. 4).

The floor panel 25 is located on the front side of the seat base 23. A control valve unit 36 (broken line in FIG. 1) is arranged below the floor panel 25. The control valve unit 36 includes a plurality of control valves that control the flow of pressure oil from the hydraulic pump to the corresponding hydraulic actuator (boom cylinder 45, etc.). The control valve unit 36 is supported on the upper surface of the swivel frame 21 via a support, and is entirely located on one side (left side in this example) of the bracket 31 in the left-right direction on the front side of the seat base 23. ..

-Working machine-
The work machine 40 is an articulated front work machine (swing post type in this embodiment) provided at the front portion of the swivel body 20 for excavating earth and sand, and is a work arm 41 and an attachment. It is configured to include the tool 44. The working arm 41 includes a boom 42, an arm 43, a boom cylinder 45, an arm cylinder 46, and a working tool cylinder 47. The boom 42 is rotatably connected to the bracket 31 of the swing body 20 (strictly speaking, one member constituting the swing post 37), the arm 43 is connected to the tip of the boom 42, and the work tool 44 is connected to the tip of the arm 43. It is rotatably connected. The boom 42, arm 43, and work tool 44 all rotate with a rotation axis extending horizontally to the left and right as a fulcrum. FIG. 1 shows an example in which a bucket is attached to the working arm 41 as a working tool 44, but the type of attachment to be attached is not limited to this. Both ends of the boom cylinder 45 are connected to the swing body 20 (swing post 37) and the boom 42, and both ends of the arm cylinder 46 are connected to the boom 42 and the arm 43, respectively. The base end of the work tool cylinder 47 is connected to the arm 43, while the tip end is connected to the tip end portion of the arm 43 and the work tool 44 via a link 48. The boom cylinder 45, the arm cylinder 46, and the work tool cylinder 47 are all hydraulic actuators, which are driven by the pressure oil discharged from the hydraulic pump and drive the work machine 40 by the expansion / contraction operation.

-Replacement-
In the base machine, an operation device (operation lever and pedal) with a pressure reducing valve is arranged in the space on the front side of the seat base 23 (area of the floor panel 25), and a driver's seat, a canopy, etc. are installed on the upper part of the seat base 23. It was. In the hydraulic excavator of the present embodiment, these operating devices, the driver's seat, the canopy, and other devices that are supposed to be boarded by the operator have been removed, and devices for wireless remote control are installed instead. Specifically, it is a solenoid valve unit 51 to 53, a controller box 61 with a receiver, and the like. The solenoid valve units 51 to 53 are composed of a plurality of solenoid valves 54 (FIG. 4). The controller box 61 has a built-in controller that controls the solenoid valve 54 in response to a signal from a wireless operating device (not shown) operated by the operator at a remote location. The base machine had a configuration in which, for example, by operating a pressure reducing valve with an operating lever, a hydraulic signal was generated using the discharge pressure of the pilot pump as the original pressure, thereby driving the control valve and operating the work machine 40 and the like. .. On the other hand, in the hydraulic excavator of this example, the solenoid valve 54 is appropriately driven by an electric signal generated by the controller in response to an operation signal from a wireless operation device operated by the operator at a remote location, and the corresponding control valve is driven. It has been remodeled into a configuration that is used.

Solenoid valve FIG. 3 is a perspective view of the overall configuration of the swivel body 20 as viewed from the front left. FIG. 4 is a plan view of the swivel body 20 with the floor panel 25 removed, and FIG. 5 is a perspective view seen from the front left. FIG. 6 is a perspective view of the swivel body 20 with the floor panel 25, the front panel 24a, and the side panel 24b removed from the front left. As shown in these figures, a valve box 30 containing the control valve unit 36 and the solenoid valve units 51 to 53 is provided in the front region of the seat base 23 on the swivel frame 21. The valve box 30 includes frames such as posts P1 to P3 and cross members C1 and C2 (FIG. 6), the floor panel 25 (FIG. 3), a front panel 24a (same as above), and side panels 24b (same as above).

The posts P1 to P3 and the cross members C1 and C2 are made of a steel material such as a channel material, are fixed to each other with bolts or the like, and are also fixed to the swivel frame 21 with bolts or the like. Posts P1 to P3 extend upward from the swivel frame 21. The post P1 is located on one side (left side in this example) of the swivel frame 21 in the left-right direction and on the front edge (corner). The post P2 is located on the opposite side of the post P1 with the bracket 31 sandwiched by the front edge of the swivel frame 21, and is close to the tank cover 27. The post P3 is located on one side of the swivel frame 21 in the left-right direction, on the rear side of the post P1 and on the front side of the seat base 23. The cross member C1 is formed in an L shape with a short side extending rearward from one end of a long side (left end in this example) extending in the left-right direction in a plan view, and is passed to the upper ends of posts P2, P1, and P3. It is arranged along the edge of the swivel frame 21. The height position of the cross member C1 is higher than the upper end of the bracket 31 and lower than the upper surface of the seat base 23. The cross member C2 is formed in a straight line, is arranged along the front edge of the swivel frame 21, and connects the middle sides of the posts P1 and P2. The cross member C2 extends across the bracket 31 from side to side together with a portion extending in the left-right direction of the upper cross member C1 (a portion along the front edge of the swivel frame 21).

The floor panel 25 described above is attached to the upper surface of the cross member C1 as an opening / closing lid with bolts or the like, and the upper surface of the valve box 30 can be opened / closed by attaching / detaching the floor panel 25. The space between the posts P1 and P2 (that is, the front surface of the valve box 30) is covered by the front panel 24a, and the space between the posts P1 and P3 (that is, the side surface of the valve box 30) is covered by the side panel 24b. The rear side of the valve box 30 is covered with a seat base 23, and the right side of the valve box 30 is covered with a hydraulic oil tank or the like. The front panel 24a and the side panel 24b are attached to the frame with bolts or the like and are removable, and the front surface and the side surface of the valve box 30 can be opened and closed by attaching and detaching them.

The solenoid valve units 51 to 53 are configured to include a plurality of solenoid valves 54 arranged side by side in a row. Each solenoid valve 54 constituting the solenoid valve units 51 and 52 drives a boom cylinder 45, an arm cylinder 46, a work tool cylinder 47, a traveling motor, and a control valve corresponding to a swivel motor. Each solenoid valve 54 constituting the solenoid valve unit 53 drives a control valve corresponding to the hydraulic actuator provided in the hydraulic attachment when the hydraulic attachment (attachment provided with the hydraulic actuator) is provided as the work tool 44. is there. The solenoid valve unit 53 can be omitted when the use of the hydraulic attachment is not expected.

The solenoid valve units 51 and 52 are attached side by side to the long side portion (the portion extending in the left-right direction) of the cross member C1, and a plurality of control valves (control valve units) are spaced apart from the swivel frame 21 (floating). It is placed above 36). The solenoid valves 54 constituting these solenoid valve units 51 and 52 are lined up side by side along the long side portion of the cross member C1 (that is, along the front edge of the swivel frame 21 in a plan view) across the bracket 31. It is arranged in. Since it is arranged along the front edge of the swivel frame 21, a wide space is secured between the solenoid valve 54 belonging to the solenoid valve units 51 and 52 and the front surface of the seat base 23. By removing the floor panel 25 during maintenance, the control valve unit 36 can be accessed from above through the space between the solenoid valve units 51 and 52 and the seat base 23 (FIG. 4). .. Further, by removing the floor panel 25, the opening / closing lid 23a on the front surface of the seat base 23 is exposed (FIG. 6), and the electronic device housed in the front portion of the seat base 23 can be accessed by removing the opening / closing lid 23a (FIG. 5). ). Further, the valve box 30 is provided at the front of the swivel frame 21 across the bracket 31 so as to fill the width of the space adjacent to the hydraulic oil tank, and is relatively flat by securing an area and suppressing the height ( The upper and lower dimensions are smaller than the front and rear and left and right dimensions). Although the position of the floor panel 25 is higher than that of the base machine due to the installation of the solenoid valve 54, it is lower than the upper surface of the hydraulic oil tank (tank cover 27) due to the flat shape of the valve box 30. It is suppressed.

The solenoid valve unit 53 is provided on the short side portion (a portion extending rearward from one end of the long side portion) of the cross member C1 and is arranged above the control valve unit 36 at a distance (floating) from the swivel frame 21. It is done. Since it is attached to the short side portion of the cross member C1, the solenoid valve unit 53 is arranged along one edge (left edge in this example) of the swivel frame 21 in the left-right direction in a plan view, and is electromagnetic. The solenoid valves 54 constituting the valve units 51 to 53 are arranged in an L shape. By arranging the solenoid valve unit 53 on one edge of the swivel frame 21 in the left-right direction, the interference of the solenoid valve unit 53 with the access space to the control valve unit 36 described above is suppressed (FIG. 4).

-Controller box The controller box 61 is arranged above the seat base 23. A controller (computer) with a receiver housed in the controller box 61 is connected to each solenoid valve 54 of the solenoid valve units 51 to 53. The controller receives an operation signal from a wireless operation device (not shown) operated by the operator and commands the corresponding solenoid valve 54 to control the operation of the traveling body 10, the turning body 20, and the working machine 40. A console 33 or the like equipped with a key switch, a monitor, or the like is installed on the other side (right side in this example) of the controller box 61 in the left-right direction. Further, pedestals 62 are provided at four corners on the upper surface of the controller box 61, and it is assumed that the camera device X is mounted as shown in FIG. The camera device X outputs signals of images and videos taken wirelessly. By receiving this signal, the operator can confirm the situation around the hydraulic excavator by the camera device X in real time on the monitor screen at a remote place.

8 and 9 are plan views of the swivel body 20 in a state where the controller box 61 is slid, FIG. 8 shows a state in which the maintenance opening 65 is closed, and FIG. 9 shows a state in which the maintenance opening 65 is opened. FIG. 10 is a perspective view of the swivel body shown in FIG. 9 as viewed from the rear left. In the present embodiment, the slide rail 63 is provided on the upper part of the seat base 23. The controller box 61 is provided so as to be slidable in the horizontal direction on the upper part of the seat base 23 via the slide rail 63. The slide rail 63 is selected to have a sufficient load capacity to withstand the weight of the controller box 61 and the camera device X. The slide rail 63 has a structure in which the inner rail moves in and out of the outer rail in the longitudinal direction and expands and contracts, and a ball or roller is interposed between the outer rail and the inner rail to suppress frictional resistance during sliding. By attaching the outer rail to either the controller box 61 or the seat base 23 and the inner rail to the other, the controller box 61 is slidably supported with respect to the seat base 23. In the present embodiment, the inner rails of the slide rails 63 are placed on the left and right side surfaces of the rectangular parallelepiped controller box 61 which is flat (the vertical dimensions are smaller than the front-rear and left-right dimensions) via a plurality of brackets (not shown). It is fixed. The outer rail of the slide rail 63 is fixed to the upper surface of the seat base 23 via a plurality of brackets (not shown). That is, the slide rail 63 is attached in a posture extending back and forth, and the controller box 61 slides back and forth by the left and right slide rails 63. A handle 64 (handle) is provided on the front surface of the controller box 61 and can be used when sliding the controller box 61.

At this time, a maintenance opening 65 (FIG. 9) is provided on the upper surface of the seat base 23. The four sides of the maintenance opening 65 are along the four sides of the upper surface of the seat base 23, and the upper surface of the seat base 23 is widely opened by the maintenance opening 65 (FIG. 9). The maintenance opening 65 is normally closed by the cover 66 (FIG. 8), and the controller box 61 is located above the cover 66. The upper surface of the seat base 23 is exposed by sliding the controller box 61 from the upper part of the seat base 23, and the maintenance opening 65 can be opened by removing the cover 66.

Further, in the present embodiment, a fixing mechanism for fixing the controller box 61 is provided. The fixing mechanism is provided at a position corresponding to the slide rail 63 (in this example, both the left and right sides of the controller box 61), and includes a plurality of sets (three sets on each side) of pedestals 67 and through holes 68. The pedestal 67 and the through hole 68 are arranged at intervals along the slide rail 63. In the case of the present embodiment, the pedestals 67 are arranged at the front end, the rear end, and the intermediate positions on the left and right side edges on the upper surface of the seat base 23. The through holes 68 are provided in the horizontal plate portions provided on the left and right side surfaces of the controller box 61 corresponding to the pedestal 67. When the controller box 61 is located above the seat base 23 (slide rail 63 is contracted), the positions of the pedestals 67 and the through holes 68 of all six sets are the same, and bolts are inserted through the through holes 68 at all six locations. B can be tightened to the pedestal 67. Further, even when the controller box 61 is slid from above the seat base 23 (the slide rail 63 is extended), the positions of the front pedestal 67 and the rear through hole 68 are the same, and the through hole 68 is formed at these two locations. The bolt B can be tightened to the pedestal 67 via the pedestal B. In the fixing mechanism, the controller box 61 is fixed at the position where the maintenance opening 65 is covered (the state where the slide rail 63 is contracted) and the position where the maintenance opening 65 is exposed (the state where the slide rail 63 is contracted). It is configured so that it can be done.

-Effect-
(1) In the hydraulic excavator of the present embodiment, except for the equipment for boarding operation of the operator, most of the base machines including the engine 29, the pump, and the control valve unit 36 as well as the traveling body 10 and the working machine 40. It is constructed by making the best use of parts. As additional parts, in addition to the plurality of solenoid valves 54 and the controller box 61, a valve box 30 for accommodating the solenoid valve 54 is provided together with the control valve unit 36. In particular, since the controller box 61 is slidably arranged on the upper part of the seat base 23, the controller box 61 can be slidably moved to open the maintenance opening 65 on the upper surface of the machine room. This makes it possible to facilitate the maintenance of equipment in the machine room such as the engine 29.

As described above, the hydraulic excavator of the present embodiment can be easily configured by utilizing the configuration of the existing hydraulic excavator (base machine), and can be quickly put into the disaster recovery site. In addition, since the maintenance of the engine 29 and the like is good, a high operating rate can be secured by shortening the maintenance time, and it can be expected to contribute to quick disaster recovery.

The controller box 61 is a heavy object, and as shown in FIG. 7, the camera device X may be further attached. For example, as long as the maintenance opening 65 is exposed, it is conceivable to have a structure in which the controller box 61 is tilted upward via a hinge, but it is not practical in consideration of the weight of the controller box 61. Further, in the tilted configuration, an excessive impact may be applied when returning to the upper part of the seat base 23. Considering that the controller box 61 including the camera device X that can be mounted is a precision device, it is not preferable. On the other hand, in the present embodiment, since the controller box 61 slides in the horizontal direction, a strong force is not required to move the controller box 61, and an impact when moving the controller box 61 can be suppressed.

(2) In the present embodiment, the slide rail 63 is attached to the side portion of the controller box 61. In this case, the arrangement of the controller box 61 can be lowered as compared with the case where the slide rail 63 is arranged under the controller box 61, and a hydraulic excavator having a low center of gravity and high stability can be provided. However, as long as the essential effect (1) is obtained, the slide rail 63 may be arranged under the controller box 61.

(3) Maintenance Since a fixing mechanism is used to fix the controller box 61 at the position where the opening 65 is covered and the position where it is exposed, the controller box 61 slides during remote control as well as during maintenance. Can be prevented. Since the controller box 61 does not move when the maintenance opening 65 is opened, the operator can concentrate on the maintenance work. As long as the controller box 61 is fixed, a structure using a clamp or the like can be considered, but the reliability of the fixed structure of the controller box 61 can be improved by using a structure using a plurality of bolts B as in the present embodiment. Can be enhanced.

(4) By providing the pull tab 64 in the controller box 61, the controller box 61 can be smoothly slid.

(5) In the present embodiment, the control valve unit 36, which is arranged on the front side of the seat base 23 which is the machine room in the base machine, is also utilized. The valve box 30 is installed in the space where the existing control valve unit 36 is arranged, and the solenoid valve 54 is added together with the control valve unit 36. At that time, the plurality of solenoid valves 54 were three-dimensionally arranged above the control valve unit 36 inside the valve box 30, and were arranged in the left-right direction across the bracket 31 along the front edge of the swivel frame 21. By arranging the solenoid valves 54 in a long row on the left and right across the bracket 31 in a manner different from that of the control valve unit 36, the distance between the seat base 23 and the solenoid valve 54 can be increased above the control valve unit 36. Can be secured. By ensuring this interval, when the floor panel 25 is removed and the upper portion of the valve box 30 is opened, the control valve unit 36 and the seat base 23 can be faced from above. As a result, maintenance of the control valve can be easily performed, and the opening / closing lid 23a on the front surface of the seat base 23 can be opened to easily access the electric equipment.

Further, by arranging the solenoid valve 54 across the bracket 31, the valve box 30 can be widened (securing an area) and flattened. Therefore, the height of the valve box 30 taken from the swivel frame 21 can be suppressed, and in this embodiment, the height is particularly lower than that of the tank cover 27. Therefore, when the camera device X is mounted as shown in FIG. 7, the camera device X can project the condition of the ground closer to the aircraft due to the lower height of the valve box 30. As a result, high visibility can be ensured, so remote control can be smoothly performed even at a remote location, and it can be put into practical use at a disaster recovery site. Further, the maintainability of the control valve unit 36 and the electronic device is also good.

(6) The floor panel 25 is naturally lower than the controller box 61, but since the height of the valve box 30, that is, the height of the floor panel 25 can be suppressed as described above, the height of the floor panel 25 and the controller box 61 is high or low. You can make a difference. Therefore, it is easy to push and pull the controller box 61 on the floor panel 25 during maintenance of the engine 29 and the like. The flattening of the valve box 30 can also contribute synergistically to the facilitation of maintenance of equipment in the machine room.

(7) Each solenoid valve 54 is arranged away from the swivel frame 21 by being supported by the cross member C1 in the upper stage, and there is a space in the vertical direction between the swivel frame 21 and each solenoid valve 54. Therefore, by removing the front panel 24a and opening the front surface of the valve box 30, the degree of freedom of access to the solenoid valves 54 of the solenoid valve units 51 and 52 is improved, and maintenance can be facilitated. Similarly, by removing the side panel 24b and opening the side surface of the valve box 30, the degree of freedom of access of the solenoid valve unit 53 to the solenoid valve 54 is improved.

(8) Since the solenoid valves 54 are arranged in a horizontal row on the front edge portion of the valve box 30 in order to secure the above access space, the length of the row is the full width of the valve box 30 with only the essential solenoid valves 54. Become. Therefore, in this example, the solenoid valve 54 is attached to the L-shaped cross member C1 and arranged in an L-shape, and the optional solenoid valve 54 is attached to the short side portion (left edge of the valve box 30) extending rearward in the cross member C1. Was placed. As a result, the solenoid valve unit 53 can be mounted without interfering with the main part of the access space, and the range of work of the hydraulic excavator can be expanded. However, when the use of the hydraulic attachment is not assumed, all the required solenoid valves 54 are arranged in a horizontal row by omitting the solenoid valve unit 53, so that it is not necessary to arrange them in an L shape.

10 ... traveling body, 21 ... swivel frame, 23 ... seat base (machine room), 29 ... engine (motor), 36 ... control valve unit (plural control valves), 40 ... working machine, 54 ... solenoid valve, 61 ... Controller box, 63 ... slide rail, 64 ... puller, 65 ... maintenance opening, 67 ... pedestal (fixing mechanism), 68 ... through hole (fixing mechanism)

Claims (5)

A traveling body, a swivel frame rotatably provided on the upper part of the traveling body, a working machine attached to the front part of the swivel frame, a hydraulic pump provided at the rear part of the swivel frame, and a prime mover for driving the hydraulic pump. , A machine room provided at the rear of the swivel frame and accommodating the hydraulic pump and the prime mover, a plurality of control valves for controlling the flow of pressure oil from the hydraulic pump to the corresponding hydraulic actuator, and an operation for driving the control valves. In a remote-operated small hydraulic excavator equipped with a plurality of solenoid valves for controlling oil and a controller box with a built-in controller for controlling the solenoid valves in response to a signal from a wireless operating device.
A slide rail provided at the top of the machine room is provided.
The controller box is slidably provided in the upper part of the machine room via the slide rail, and the maintenance opening provided in the upper part of the machine room is opened by sliding from the upper part of the machine room. A small remote-operated hydraulic excavator characterized by being configured to be open. The remote-controlled small hydraulic excavator according to claim 1, wherein the slide rail is attached to a side portion of the controller box. The remote-controlled small hydraulic excavator according to claim 1, wherein the controller box slides back and forth. The remote-controlled compact hydraulic excavator according to claim 1 is characterized in that a fixing mechanism for fixing the controller box at a position where the maintenance opening of the machine room is covered and a position where the maintenance opening is exposed is provided. Remote-controlled small hydraulic excavator. The remote-controlled small hydraulic excavator according to claim 1, wherein the controller box is provided with a puller.

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