JP2018172944A - Shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shovel that prevents more securely false detection of a state where a hook is not stored in a storage part and that can cope with various needs in work sites.SOLUTION: A shovel 100 comprises a lower traveling body 1, a revolving superstructure 3 mounted on the lower traveling body 1 rotatably, an excavation attachment attached to the revolving superstructure 3, a controller 30 mounted on the revolving superstructure 3, a first cable 35 extending from the controller 30, and a connector 36 connected to an end of the first cable 35. The connector 36 is configured to be alternatively connected to a second cable 37 and a short circuit cable 38. The second cable 37 extends from a detection device 51 that detects the storage state of a hook 80 capable of being stored in the excavation attachment, and the short circuit cable 38 short-circuits a cable way in the first cable 35.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an excavator.

  There is known an excavator in which a hook for performing crane work is attached to a drilling attachment for performing excavation work (see Patent Document 1). The hook is rotatably attached so as to be housed in a housing portion provided in the excavation attachment. And it is comprised so that it may be stored in a storage part at the time of excavation work, and the front-end | tip may protrude from a storage part at the time of crane work.

  If excavation work is performed in a state where the hook is not stored in the storage unit, the hook, the bucket, or the like may be damaged. Therefore, the above-described excavator determines whether or not the hook is not stored in the storage unit based on the output of the proximity switch that detects the storage state of the hook. When it is determined that the hook is not stored in the storage unit, the movement of the excavation attachment is restricted by switching the work mode to the crane mode.

JP 2001-90099 A

  However, although the convenience at the time of crane work is improved, the proximity switch is attached to the bucket link at the work site where excavation work other than the crane work is performed, so that the switch is in contact with the earth or sand and submerged. The frequency is high. Therefore, the cable connecting the proximity switch and the controller is easily disconnected. In such a situation, the above-described excavator may erroneously determine that the cable is disconnected as a state where the hook is not stored in the storage unit, that is, a state where crane work is being performed. is there. As a result, even when excavation work is performed, the work mode may be switched to the crane mode, and movement of the excavation attachment may be limited. Thus, it is not possible to sufficiently meet the needs of various work sites.

  In view of the above, it is desirable to provide an excavator that can more reliably prevent erroneous detection in a state in which the hook is not stored in the storage unit and can meet the needs of various work sites.

  An excavator according to an embodiment of the present invention includes a lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, an attachment that is attached to the upper revolving body, and a control that is mounted on the upper revolving body. An excavator comprising a device, a first cable extending from the control device, and a connector connected to an end of the first cable, wherein the connector detects a storage state of a hook that can be stored in the attachment. A second cable extending from the detection device, and a short-circuit cable that short-circuits the electric circuit in the first cable.

  By the above-described means, it is possible to provide a shovel capable of more reliably preventing erroneous detection in a state where the hook is not stored in the storage unit and responding to needs at various work sites.

It is a side view of the shovel which concerns on the Example of this invention. It is a figure which illustrates the structure of the drive system of the shovel of FIG. It is a figure which shows the connection state of the electric circuit in a 1st cable. It is a top view of a hook accommodating part. It is a side view of a hook storage part. It is a figure which shows the example of a 1st cable routing.

  Hereinafter, an excavator (excavator) according to an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

  FIG. 1 is a side view of an excavator 100 according to an embodiment of the present invention. An upper swing body 3 is mounted on the lower traveling body 1 of the excavator 100 via the swing mechanism 2 so as to be rotatable about the swing axis 2X. A cabin 10 as a cab is mounted on the upper swing body 3. Various devices such as a controller 30 and a display device 40 are mounted in the cabin 10.

  A boom 4 is attached to the upper swing body 3. An arm 5 is attached to the tip of the boom 4, and a bucket 6 is attached to the tip of the arm 5 as an end attachment. An end attachment other than the bucket 6 such as a breaker or a grapple may be attached to the tip of the arm 5.

  The boom 4, the arm 5, and the bucket 6 constitute an excavation attachment that is an example of an attachment. The boom 4, the arm 5, and the bucket 6 are hydraulically driven by a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9, respectively. An attachment other than the excavation attachment may be attached to the upper swing body 3.

  The rod side end of the bucket cylinder 9 and the bucket 6 are connected by a bucket link 70. Specifically, the upper end side of the bucket link 70 is rotatably connected to the rod side end portion of the bucket cylinder 9 and the arm link 52 via the bucket cylinder top pin 64. The lower end side of the bucket link 70 is rotatably connected to a bracket on the rear surface of the bucket 6 via a bucket pin 62. A hook 80 for crane work is attached to the bucket link 70 so as to be retractable and rotatable.

  The hook 80 is housed in the hook housing portion 50 mainly composed of the bucket link 70 during excavation work. This is to prevent the operation of the bucket 6 from being hindered. On the other hand, at the time of crane work, the tip is projected from the hook storage portion 50.

  FIG. 2 is a diagram illustrating a configuration example of the drive system of the excavator 100. In FIG. 2, the mechanical power transmission line, the hydraulic oil line, the pilot line, and the electric drive / control line are indicated by a double line, a solid line, a broken line, and a dotted line, respectively.

  The drive system of the excavator 100 mainly includes an engine 11, a main pump 14, a pilot pump 15, a control valve 17, an operating device 26, and a controller 30.

  The engine 11 is a drive source of the excavator 100 and operates, for example, so as to maintain a predetermined rotational speed, and an output shaft is connected to each input shaft of the main pump 14 and the pilot pump 15.

  The main pump 14 can supply hydraulic oil to the control valve 17 via the hydraulic oil line. In this embodiment, it is a swash plate type variable displacement hydraulic pump. The discharge amount of the main pump 14 is controlled, for example, by adjusting a swash plate tilt angle by a regulator (not shown) in accordance with a control signal from the controller 30.

  The pilot pump 15 can supply hydraulic oil to various hydraulic control devices via a pilot line. In this embodiment, it is a fixed displacement hydraulic pump.

  The control valve 17 is a hydraulic control device that controls the hydraulic system in the excavator 100. The control valve 17 is, for example, for one or more of a boom cylinder 7, an arm cylinder 8, a bucket cylinder 9, a left traveling hydraulic motor 1L, a right traveling hydraulic motor 1R, and a turning hydraulic motor 2A. The hydraulic oil received from the main pump 14 is selectively supplied.

  In the following description, the boom cylinder 7, the arm cylinder 8, the bucket cylinder 9, the left traveling hydraulic motor 1L, the right traveling hydraulic motor 1R, and the turning hydraulic motor 2A are collectively referred to as a “hydraulic actuator”. There is a case.

  The operating device 26 is a device used by an operator for operating the hydraulic actuator. In this embodiment, the operating device 26 supplies the hydraulic oil received from the pilot pump 15 to the pilot ports of the flow control valves corresponding to the hydraulic actuators via the pilot line.

  The hydraulic oil pressure (pilot pressure) supplied to each pilot port is a pressure corresponding to the operating direction and operating amount of the lever or pedal of the operating device 26 corresponding to each hydraulic actuator. Each pilot pressure is detected by, for example, a pressure sensor, and the detected value is output to the controller 30.

  The controller 30 is a control device that controls the operation of the excavator 100, and includes functional elements such as a storage determination unit 31, a control unit 32, and a mode switching unit 33. The controller 30 is constituted by a computer including a CPU, a RAM, a ROM, and the like, for example. Each functional element of the controller 30 is realized, for example, when the CPU executes a program stored in the ROM on the RAM.

  The boom cylinder pressure sensor 7 a detects the hydraulic oil pressure in the bottom side oil chamber of the boom cylinder 7 and outputs the detected value to the controller 30.

  The first cable 35 is configured so that the controller 30 and the connector 36 can be electrically connected. In the present embodiment, the first cable 35 is a cable harness including the electric circuit E1 and the electric circuit E2.

  The connector 36 is an electrical component connected to the end of the first cable 35. In this embodiment, the receptacle is a receptacle such as a receptacle that can accept a plug such as a plug. The connector 36 may be detachably connected to the first cable 35.

  The second cable 37 is configured so that the connector 36 and the detection device 51 can be electrically connected. In the present embodiment, the second cable 37 is a cable harness including an electric circuit E3 and an electric circuit E4. A plug such as a plug is attached to one end of each of the electric circuit E3 and the electric circuit E4 so that the connector 36 can be connected. The other ends of the electric circuit E3 and the electric circuit E4 are connected to the detection device 51.

  The short circuit cable 38 is configured to be connectable to the connector 36. In this embodiment, the cable harness includes a loop-shaped electric path E5. Plugs such as plugs are attached to both ends of the electric path E5 so as to be connected to the connector 36. When the short circuit cable 38 is connected to the connector 36, the electric circuit E1 and the electric circuit E2 in the first cable 35 can be short-circuited.

  As described above, the connector 36 is configured to be alternatively connected to the second cable 37 extending from the detection device 51 and the short-circuit cable 38. For example, when performing excavation work with an excavator, the operator connects the short-circuit cable 38 to the connector 36 instead of the second cable 37.

  The detection device 51 detects the storage state of the hook 80 that can be stored in the attachment. In the present embodiment, the detection device 51 is a switch that is in a conductive state when the hook 80 is present in the hook storage unit 50 and is in a cutoff state when the hook 80 is not present in the hook storage unit 50. Is provided in the hook storage portion 50 in which is stored.

  The display device 40 displays various pieces of image information according to instructions from the controller 30. In the present embodiment, the display device 40 is an in-vehicle liquid crystal display connected to the controller 30. The display device 40 is connected to the controller 30 via a communication network such as CAN. The display device 40 may be connected to the controller 30 via a dedicated line.

  The mode switch 41 is a switch for switching the work mode of the excavator 100. The work mode means a type of work by the excavator 100, and includes, for example, a crane mode, a normal mode, and the like. In the present embodiment, the mode change switch 41 is a software switch on a touch panel arranged on the screen of the display device 40. However, the mode switch 41 may be a hardware switch installed around the display device 40 or a switch installed at another position in the cabin 10.

  Here, the storage determination unit 31, the control unit 32, and the mode switching unit 33 that are functional elements of the controller 30 will be described.

  The storage determination unit 31 determines whether or not the hook 80 is stored in the hook storage unit 50. In the present embodiment, the storage determination unit 31 determines that the hook 80 is stored in the hook storage unit 50 when it is detected that the electric circuit E1 and the electric circuit E2 in the first cable 35 are in a conductive state. . Whether or not the electric circuit E1 and the electric circuit E2 are in a conductive state is detected by any means.

  The electric circuit E1 and the electric circuit E2 are in a conductive state when the second cable 37 is connected to the connector 36 and the detection device 51 is in a conductive state. Alternatively, when the short-circuit cable 38 is connected to the connector 36, the conductive state is established.

  The control unit 32 automatically switches the excavator work mode. In the present embodiment, the control unit 32 switches the work mode of the excavator 100 to the crane mode when the storage determination unit 31 determines that the hook 80 is not stored in the hook storage unit 50. In this case, for example, the control unit 32 outputs a control signal for lowering the engine speed to the engine 11 than in the normal mode. This is to prevent the suspended load from shaking and colliding with other objects or falling by lowering the rotational speed of the engine 11 and slowing down the movement of the excavation attachment. The control unit 32 restricts a predetermined operation of the excavation attachment such as a bucket opening operation. This is to prevent the excavation work from being performed in a state where the hook 80 protrudes from the excavation attachment, and the bucket 6, the hook 80, and the like are damaged. Further, since the bucket 6 and the hook 80 come into contact with each other, it becomes impossible to accurately detect a suspended load, an accurate work radius, and the like, and further, an erroneous alarm is output due to them. It is for preventing it.

  When the short-circuit cable 38 is connected to the connector 36 as described above, the control unit 32 does not switch the work mode of the excavator 100 to the crane mode. Whether the hook 80 is actually stored in the hook storage unit 50 or whether the second cable 37 extending from the detection device 51 is disconnected is stored in the storage determination unit 31. This is to determine that it is stored in the unit 50. In this way, the short-circuit cable 38 can make the housed state of the hook 80 and the automatic switching of the work mode by the control unit 32 inoperative. And the shovel 100 can respond | correspond to the various needs of a work site by attaching the short circuit cable 38. FIG.

  In the crane mode, the control unit 32 calculates the weight of the suspended load based on the output of the boom cylinder pressure sensor 7a, and issues an alarm to the operator when the load becomes close to the rated weight. This is because it is possible to prevent the suspended load exceeding the rated weight from being lifted by issuing an alarm and to ensure the stability of the excavator 100.

  The mode switching unit 33 allows the operator to switch the work mode. In the present embodiment, the mode switching unit 33 switches the work mode of the excavator 100 based on the output of the mode switch 41. For example, the mode switching unit 33 alternately switches between the normal mode and the crane mode every time the mode switching switch 41 is pressed. Three or more work modes may be switched in order. For example, even when the hook 80 is stored in the hook storage unit 50, the worker can switch the work mode of the excavator 100 to the crane mode by pressing the mode switch 41. In this case, the operator can intentionally slow down the movement of the excavator 100.

  When the hook 80 is not stored in the hook storage unit 50, the operator cannot switch the work mode of the excavator 100 to the normal mode even if the operator presses the mode switch 41.

  Here, the connection state of the electric circuit will be described with reference to FIG. FIG. 3 is a diagram illustrating a connection state of the electric circuit.

  As shown in FIG. 3A, when the second cable 37 is connected to the connector 36 and the detection device 51 is in a conductive state, the electric circuit E1 is connected to the electric circuit E2 via the electric circuit E3, the detection device 51, and the electric circuit E4. It is connected. Therefore, the electric circuit E1 and the electric circuit E2 are in a conductive state, and the storage determination unit 31 determines that the hook 80 is stored in the hook storage unit 50. That is, the controller 30 determines that it is not the crane mode but the normal mode.

  As shown in FIG. 3B, when the second cable 37 is connected to the connector 36 and the detection device 51 is in the cut-off state, the electric circuit E1 is connected to the electric circuit E3, and the electric circuit E4 is connected to the electric circuit E2. . However, since the detection device 51 is in the cut-off state, the electric circuit E3 and the electric circuit E4 are not in a conductive state. Therefore, the electric circuit E <b> 1 and the electric circuit E <b> 2 are in a disconnected state, and the storage determination unit 31 determines that the hook 80 is not stored in the hook storage unit 50. That is, the controller 30 determines that the crane mode is set.

  As shown in FIG. 3C, when the short circuit cable 38 is connected to the connector 36, the electric circuit E1 is connected to the electric circuit E2 via the electric circuit E5. Therefore, the electric circuit E1 and the electric circuit E2 are in a conductive state, and the storage determination unit 31 determines that the hook 80 is stored in the hook storage unit 50. In this case, the storage determination unit 31 determines that the normal mode is set instead of the crane mode. That is, the crane mode and the normal mode can be switched based only on the output of the mode switch 41 in the cabin 10 regardless of the detection of the storage state of the hook 80.

  FIG. 4 is a plan view of the hook storage portion 50 as viewed from the direction of arrow II in FIG. FIG. 5 is a side view of the hook storage unit 50. 4 and 5 show a state in which the hook 80 is accommodated in the hook accommodating portion 50. FIG.

  The hook storage unit 50 includes a bucket link 70 and stores the hook 80 in the storage space SP. The hook 80 is stored in the storage space SP of the hook storage unit 50 during excavation work, and is taken out from the storage space SP and used during crane work.

  The hook 80 has a hook-shaped hook 81 at the tip, and a universal joint 83 to which the hook 81 is attached is connected to the hook support 85 by a connecting shaft 84. The hook support portion 85 is rotatably connected to the bucket pin 62. The hook support portion 85 is suspended from the bucket pin 62 and supports the flange portion 81 and the universal joint 83 when the hook 80 is taken out from the hook storage portion 50.

  The bucket link 70 includes lower end side connecting portions 71 and 72 through which the bucket pin 62 is inserted, upper end side connecting portions 73 and 74 through which the bucket cylinder top pin 64 is inserted, and the lower end side connecting portion 71 and the upper end side connecting portion 73. It has the left side coupling | bond part 75 couple | bonded and the right side coupling | bond part 76 which couple | bonds the lower end side connection part 72 and the upper end side connection part 74. As shown in FIG.

  The left side coupling portion 75 includes a left side plate 77 provided between the lower end side coupling portion 71 and the upper end side coupling portion 73, as indicated by a broken line in FIG. The right coupling portion 76 includes a right side plate 78 provided between the lower end side coupling portion 72 and the upper end side coupling portion 74. An upper end side horizontal plate 101 is provided between the left side plate 77 and the right side plate 78.

  The storage space SP is a space surrounded by the bucket pin 62, the left coupling portion 75, the right coupling portion 76, and the upper end side horizontal plate 101. The hook 80 is stored in the storage space SP during excavation work. In the storage space SP, a hook receiving member 102 joined to the upper end side horizontal plate 101 is provided. The hook receiving member 102 is a plate-like member provided in parallel with the left side plate 77 and the right side plate 78, and holds the hook portion 81 of the hook 80 stored in the storage space SP in cooperation with the storage pin 90.

  The storage pin 90 includes a shaft 91, a hook holding portion 92, and a grip portion 93. The hook holding portion 92 is urged toward the hook receiving member 102 by a coil spring 94 as an urging member. The shaft 91 is inserted into a through-hole provided in the right side plate 78 and is provided so as to be slidable in the axial direction (left-right direction in FIG. 4). The hook holding portion 92 is provided at the end of the shaft 91 on the hook receiving member 102 side (−X side). As indicated by a broken line, the hook holding portion 92 has a tapered shape having a smaller outer diameter on the end side (−X side) so as to be slidably incorporated in a pin receiving hole 102 </ b> H provided in the hook receiving member 102. . The grip portion 93 is provided at an end portion (+ X side) opposite to the hook holding portion 92 of the shaft 91 and is used for operating the storage pin 90.

  When the hook 80 is taken out for carrying out crane work from the state in which the hook 80 is stored in the storage space SP (the state shown in FIGS. 4 and 5), the operator holds the hook 93. The storage pin 90 is pulled in a direction in which the holding portion 92 is separated from the hook receiving member 102. When the storage pin 90 is pulled, the hook holding portion 92 moves in the + X direction. Therefore, the hook portion 81 of the hook 80 held between the hook holding portion 92 and the hook receiving member 102 is released from the holding state.

  When the collar portion 81 is released from the holding state, the operator can take out the hook 80 from the storage space SP by rotating the hook support portion 85 around the bucket pin 62. And the operator can implement | achieve the state in which a crane operation | work is possible by taking out the hook 80 from storage space SP, and making the collar part 81 suspended from the bucket pin 62 below.

  When the hook 80 is stored in the storage space SP after the crane work is finished, the operator pulls the storage pin 90 to separate the hook holding portion 92 and the hook receiving member 102 from each other. In this state, the operator rotates the hook support portion 85 around the bucket pin 62 and inserts the flange portion 81 between the hook holding portion 92 and the hook receiving member 102. Thereafter, when the storage pin 90 is released, the storage pin 90 is biased by the coil spring 94 and displaced toward the hook receiving member 102, and the flange 81 is sandwiched between the hook holding portion 92 and the hook receiving member 102. Retained. Specifically, the hook holding portion 92 has a tip passing through the inside of the flange portion 81, and an inclined surface thereof is in contact with one side surface of the flange portion 81, and the other side surface of the flange portion 81 is connected to the hook receiving member. Press against 102. The hook 80 is stored without dropping from the hook storage unit 50 by holding the hook portion 81 so that the hook portion 81 is caught by the hook holding portion 92.

  The hook storage unit 50 is provided with a detection device 51 that detects the storage state of the hook 80. In this embodiment, a proximity switch is provided as the detection device 51. As shown in FIG. 4, the detection device 51 is attached to the left side plate 77 via a pedestal 53. The detection device 51 is in a conductive state when the hook holding portion 92 is in the storage position. The storage position of the hook holding portion 92 is the position of the hook holding portion 92 when the hook 80 is in the storage position. This is because the position of the end portion on the −X side of the hook holding portion 92 varies depending on whether or not the hook 80 exists in the storage position. However, the detection device 51 may be in a conductive state when the hook 80 is in the storage position regardless of the position of the hook holding portion 92. Further, the detection device 51 may be a contact type or a non-contact type. The detection device 51 may be another device such as a limit switch or a proximity sensor. Further, the detection device 51 may be attached on the −X side surface of the hook receiving member 102 in the vicinity of the pin receiving hole 102H through which the tip portion of the hook holding portion 92 of the storage pin 90 is inserted.

  In a state where the hook 80 is stored in the hook storage portion 50, the hook holding portion 92 of the storage pin 90 is fitted on the inner peripheral surface of the flange portion 81 of the hook 80, and the hook holding portion 92 and the hook receiving member 102 are interposed. A collar 81 is held.

  The hook holding portion 92 has an outer diameter on the front end side (−X side) smaller than an inner diameter of the flange portion 81 of the hook 80 and an outer diameter on the rear end side (+ X side) equal to or larger than the inner diameter of the flange portion 81. Is formed. Therefore, when the hook 80 is stored in the hook storage portion 50, the storage pin 90 is urged by the coil spring 94 and the hook holding portion 92 is inserted into the flange portion 81, the intermediate portion of the hook holding portion 92 is the portion of the flange portion 81. It will be in the state fitted in the inner peripheral surface. Further, when the storage pin 90 is biased by the coil spring 94, the hook holding portion 92 is in a state of pressing and fixing the collar portion 81 against the + X side surface of the hook receiving member 102.

  As described above, when the hook 80 is stored, the hook holding portion 92 of the storage pin 90 fits into the hook portion 81 of the hook 80, and the hook portion 81 is held between the hook holding portion 92 and the hook receiving member 102.

  In a state where the hook 80 is taken out from the hook storage portion 50 and used, the storage pin 90 is displaced toward the hook receiving member 102 than when the hook 80 is stored.

  The hook receiving member 102 is formed with a pin receiving hole 102H having a diameter not less than the outer diameter on the front end side of the hook holding portion 92 and smaller than the outer shape on the rear end side at a position facing the hook holding portion 92 of the storage pin 90. ing. When the hook 80 is not in the hook housing portion 50, the housing pin 90 is biased by the coil spring 94, and the housing pin 90 is moved to the hook receiving member 102 side until the intermediate portion of the hook holding portion 92 fits into the pin receiving hole 102H ( -X side). Furthermore, the tip portion of the hook holding portion 92 is in a state of penetrating the pin receiving hole 102H of the hook receiving member 102.

  Thus, when the hook 80 is not stored in the hook storage portion 50, the storage pin 90 biased by the coil spring 94 is closer to the hook receiving member 102 (−X than the case where the hook 80 is stored). Side).

  The detection device 51 shuts off when the hook 80 is removed from the hook housing portion 50 and the housing pin 90 is displaced and the hook holding portion 92 enters the detection region, that is, when the hook holding portion 92 approaches to a predetermined distance. It becomes a state (non-conducting state). The detection device 51 is disposed at a position facing the hook holding portion 92 in the axial direction of the storage pin 90.

  Specifically, the detection device 51 enters a shut-off state when the hook 80 is taken out from the hook storage portion 50, the storage pin 90 is displaced, and the hook holding portion 92 approaches a predetermined distance.

  When the hook 80 is stored in the hook storage unit 50 and the hook holding unit 92 is fitted into the flange 81 of the hook 80 and the hook holding unit 92 is not close to the processing distance, the detection device 51 is in a conductive state.

  When the hook holding unit 92 approaches the detection device 51 to a predetermined distance and the detection device 51 is switched from the conductive state to the cutoff state, the controller 30 determines that the hook 80 is not stored in the hook storage unit 50. In the present embodiment, the detection device 51 is connected to the controller 30 via the second cable 37 routed along the pedestal 53, the left side plate 77, and the upper end side horizontal plate 101. The storage determination unit 31 of the controller 30 determines that the hook 80 is not stored in the hook storage unit 50 when the hook holding unit 92 of the storage pin 90 approaches the detection device 51. When the storage determination unit 31 determines that the hook 80 is not stored in the hook storage unit 50, the control unit 32 switches the work mode of the excavator 100 to the crane mode.

  Next, with reference to FIG. 6, an example of the arrangement of the first cable 35 with respect to the excavation attachment will be described. FIG. 6 is a diagram illustrating an arrangement example of the first cable 35. Specifically, FIG. 6A is a side view of the periphery of the arm 5. FIG. 6B is an enlarged view of a range R1 indicated by a broken line in FIG.

  As shown in FIG. 6A, most of the first cable 35 extending from the controller 30 is along the hydraulic oil line 9a which is a pipe connected to the rod side oil chamber and the bottom side oil chamber of the bucket cylinder 9. It extends. When the arm 5 reaches the back surface, it separates from the hydraulic oil line 9 a and extends to the vicinity of the bucket link 70 along the back surface of the arm 5.

  In the vicinity of the bucket link 70, as shown in FIG. 6B, the connector 36 is fixed to the back surface of the arm 5. The connector 36 is disposed so as to be selectively connected to the second cable 37 extending from the detection device 51 and the short-circuit cable 38. In the example of FIG. 6B, the second cable 37 is detached from the connector 36 and stored in the storage space SP. The second cable 37 may be detached from the connector 36 and the detection device 51 and housed in a tool box provided at the right front portion of the upper swing body 3. Moreover, both the 2nd cable 37 and the detection apparatus 51 may be removed and accommodated in a tool box. A short-circuit cable 38 is connected to the connector 36. In this case, the storage determination unit 31 of the controller 30 regardless of whether the hook 80 is actually stored in the hook storage unit 50 or whether the second cable 37 extending from the detection device 51 is disconnected. It is determined that the hook 80 is stored in the hook storage unit 50. That is, the crane mode and the normal mode can be switched based only on the output of the mode switch 41 in the cabin 10 regardless of the detection of the storage state of the hook 80.

  As described above, the excavator 100 according to the embodiment of the present invention includes the lower traveling body 1, the upper revolving body 3 that is turnably mounted on the lower traveling body 1, the excavation attachment attached to the upper revolving body 3, A controller 30 mounted on the upper swing body 3, a first cable 35 extending from the controller 30, and a connector 36 connected to an end of the first cable 35 are provided. The connector 36 includes a second cable 37 extending from the detection device 51 that detects the storage state of the hook 80 that can be stored in the excavation attachment, and a short-circuit cable 38 that short-circuits the electric circuit E1 and the electric circuit E2 in the first cable 35. It is configured to be connected alternatively. That is, the connector 36 can always make the electric circuit E1 and the electric circuit E2 in the first cable 35 conductive, and the determination result that the hook 80 is stored in the hook storage unit 50 is always obtained. Therefore, the shovel 100 can make the storage state of the hook 80 and the automatic switching of the work mode by the control unit 32 non-interlocking. This can meet the needs of various work sites.

  The shovel 100 may have a mode switching unit 33 that can switch between two or more work modes including a crane mode. With this configuration, the work mode can be manually switched. Therefore, the operator can select the crane mode regardless of the storage state of the hook 80, for example.

  The connector 36 is desirably disposed in the vicinity of the bucket link 70. With this configuration, the connector 36 can shorten the second cable 37 extending from the detection device 51.

  The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiments. Various modifications, substitutions, and the like can be applied to the above-described embodiments without departing from the scope of the present invention. In addition, each of the features described with reference to the above-described embodiments may be appropriately combined as long as there is no technical contradiction.

  For example, in the above-described embodiment, the first cable 35 has a pair of electric circuits E1 and E2, and the detection device 51 is a switch that switches between a conductive state and a cut-off state. However, the present invention is not limited to this configuration. The first cable 35 may be configured to have a plurality of pairs of electric circuits, or may be configured to include only one electric circuit. In the case of a configuration having only one electric circuit, the detection device 51 may be a sensor that outputs an ON signal when the hook 80 is present in the hook storage unit 50. In this case, the short-circuit cable 38 that short-circuits the electric path in the first cable 35 may be configured as a device that always outputs an ON signal.

  DESCRIPTION OF SYMBOLS 1 ... Lower traveling body 1L ... Hydraulic motor for left travel 1R ... Hydraulic motor for right travel 2 ... Turning mechanism 2A ... Hydraulic motor for turning 2X ... Turning shaft 3 ... Upper Revolving body 4 ... Boom 5 ... Arm 6 ... Bucket 7 ... Boom cylinder 7a ... Boom cylinder pressure sensor 8 ... Arm cylinder 9 ... Bucket cylinder 9a ... Hydraulic oil line DESCRIPTION OF SYMBOLS 10 ... Cabin 11 ... Engine 14 ... Main pump 15 ... Pilot pump 17 ... Control valve 26 ... Operating device 30 ... Controller 31 ... Storage determination part 32 ... Control unit 33 ... Mode switching unit 35 ... First cable 36 ... Connector 37 ... Second cable 38 ... Short-circuit cable 40 ... Display device DESCRIPTION OF SYMBOLS 41 ... Mode changeover switch 50 ... Hook accommodating part 51 ... Detection apparatus 52 ... Arm link 53 ... Base 62 ... Bucket pin 64 ... Bucket cylinder top pin 70 ... Bucket Link 71, 72 ... lower end side connection part 73, 74 ... upper end side connection part 75 ... left side connection part 76 ... right side connection part 77 ... left side plate 78 ... right side plate 80 ...・ Hook 81... Collar 83... Universal joint 84 .. connection shaft 85... Hook support portion 90 .. storage pin 91 .. shaft 92 .. hook holding portion 93. Part 94: Coil spring 100 ... Excavator 101 ... Upper end side horizontal plate 102 ... Hook receiving member 102H ... Pin receiving hole E1-E5 ... Electric circuit SP ... Storage space

Claims (4)

A lower traveling body,
An upper swivel body that is turnably mounted on the lower traveling body;
An attachment attached to the upper swing body;
A control device mounted on the upper swing body;
A first cable extending from the control device;
A shovel comprising a connector connected to an end of the first cable,
The connector is configured to be selectively connected to a second cable extending from a detection device that detects a storage state of a hook that can be stored in the attachment, and a short-circuit cable that short-circuits an electric path in the first cable. Being
Excavator. When the connector is connected to the short-circuit cable, the control device determines that the hook is in a stored state.
The excavator according to claim 1. When the connector is connected to the short-circuit cable, the control device switches the work mode based only on the output of the mode switch located in the cabin mounted on the upper swing body,
The shovel according to claim 1 or 2. The connector is disposed in the vicinity of the bucket link,
The excavator according to any one of claims 1 to 3.

Images