Hole digging and pole erection vehicle

Abstract

To provide a hole digging and pole erection vehicle capable of efficiently and safely storing an earth auger device.SOLUTION: A hole digging and pole erection vehicle includes a travelable vehicle body, a boom mounted on the vehicle body and capable of extension, contraction, and raising / lowering, an earth auger device attached to a tip of the boom so that it can swing downward, and a controller that moves the earth auger device to a storage position substantially parallel to the boom. The earth auger storage control device controls the boom to retract until it is fully retracted, to raise / lower until the boom is at an angle of 60 degrees or more, and to move the earth auger device to the storage position when the boom is fully retracted and at an angle of 60 degrees or more.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a hole digging and pole erection vehicle equipped with an auger device for excavating the ground. [Background technology]

[0002] Generally, a pole digging vehicle has a swivel base rotatably mounted on the vehicle body, a boom mounted on the swivel base so that it can be raised and lowered, and an earth auger device is swingably attached to the tip of the boom in a hanging state (for example, Patent Document 1). Generally, an earth auger device has an auger motor swingably attached to the tip of the boom, a shaft attached to the drive shaft of the auger motor, and a screw formed in a spiral shape on the lower outer periphery of the shaft, and by rotating the shaft with the auger motor, the screw excavates a cylindrical shape in the ground, forming a pole hole for erecting a utility pole, etc.

[0003] When the above-mentioned pole-digging vehicle is moved, the earth auger device must be stored while hanging from the tip of the boom. The procedure for storing the earth auger device involves first rotating the boom to the rear or side of the vehicle, then fully retracting the boom (hereinafter referred to as "fully retracted") and setting the boom hoisting angle to approximately 30°. Next, the worker attaches one end of the storage rope, the other end of which is fixed to the boom, to a hook formed on the shaft, and then hoists the boom to approximately 60°. In this state, when the worker rotates the auger motor forward, the shaft winds up the storage rope, gradually moving the tip of the earth auger device closer to the boom, with the base end of the earth auger device as its axis. This gradually makes the earth auger device parallel to the boom, and when the earth auger device reaches the specified storage position, the worker stops the auger motor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-78520 Summary of the Invention [Problem to be solved by the invention]

[0005] However, if an operator does not follow the above-mentioned storage procedure and, for example, operates the auger motor to retract the storage rope onto the shaft without fully retracting the boom, the storage rope may become taut before the auger device reaches the specified storage position, preventing it from being retracted. In this case, the operator must temporarily stop the auger motor, fully retract the boom, and then start the auger motor again, which causes delays in the storage work.

[0006] The present invention has been made in view of the above problems, and has as its object to provide a hole digging and pole erection vehicle that can store an earth auger device efficiently and safely. [Means for solving the problem]

[0007] In order to achieve this object, the hole digging and pole erection vehicle of the present invention comprises a vehicle body capable of traveling, a boom attached to the vehicle body and capable of extension and contraction and raising and lowering, an earth auger device attached so that it can swing in a hanging-down state to the tip of the boom, and an earth auger storage control device (for example, controller 100 in the embodiments) that moves the earth auger device to a storage position that is approximately parallel to the boom, and the earth auger storage control device controls the boom to retract until it reaches a predetermined extension amount (for example, a fully retracted state in the embodiments), raises and lowers the boom until it reaches a predetermined hoisting angle, and moves the earth auger device to the storage position when the boom has reached the predetermined extension amount and the predetermined hoisting angle.

[0008] In the above-described hole-digging and pole-setting vehicle, the earth auger device preferably has a motor section (e.g., auger motor 54 in the embodiments) attached to the tip of the boom so that it can swing downward with its output shaft facing downward, a long, rod-shaped shaft section attached to the output shaft of the motor section, a screw section (e.g., auger screw 74 in the embodiments) formed in a spiral shape on the lower outer periphery of the shaft section, and a storage rope (e.g., holding rope 59 in the embodiments) having one end attached to the boom and the other end detachably attached to the upper outer periphery of the shaft section, and the earth auger storage control device preferably drives the motor section to rotate the earth auger device and moves the earth auger device to the storage position by winding the storage rope around the upper outer periphery of the shaft section.

[0009] In the above-mentioned hole-digging pole erection vehicle, the earth auger storage control device is equipped with a tension detector (for example, tension sensor 39 in the embodiment) that detects the tension of the storage rope, and while the boom is being raised and lowered to the specified raising and lowering angle, it drives the motor unit to wind the storage rope around the upper outer circumference of the shaft unit, and if the tension detector detects that the tension of the storage rope is equal to or greater than a specified value, it temporarily suspends the driving of the motor unit, and if the tension of the storage rope falls below the specified value due to the raising and lowering of the boom, it is preferable to drive the motor unit again.

[0010] In the above-mentioned hole digging and pole erection vehicle, the earth auger device has an extendable structure and is equipped with an extension amount detector (for example, proximity sensor 58 in the embodiment) that detects the amount of extension of the earth auger device, and it is preferable that the earth auger storage control device moves the earth auger device to the storage position on the condition that the extension amount detector detects that the earth auger device has been completely retracted. [Effects of the Invention]

[0011] According to the present invention, the earth auger storage control device retracts the boom until it reaches a predetermined extension amount, raises and lowers the boom until it reaches a predetermined hoisting angle, and controls the earth auger device to move to a storage position when the boom has reached the predetermined extension amount and predetermined hoisting angle, so there is no risk of being forced to interrupt a series of storage operations for the earth auger device midway, and storage operations for the earth auger device can be carried out efficiently and safely.

[0012] In addition, the earth auger device has a motor unit, a shaft unit, a screw unit, and a storage rope, and the earth auger storage control device moves the earth auger device to a storage position by driving the motor unit and winding the storage rope around the upper outer circumference of the shaft unit, making it possible to make the configuration for moving the earth auger device to a storage position simpler and less expensive.

[0013] The earth auger storage control device also includes a tension detector that detects the tension in the storage rope, and while the boom is being raised or lowered, drives the motor unit to wind the storage rope around the upper outer periphery of the shaft unit, temporarily suspending the drive of the motor unit when the tension in the storage rope reaches a predetermined value, and if, during this time, the tension in the storage rope falls below the predetermined value due to the raising or lowering of the boom, drives the motor unit again, so that the boom can be raised or lowered and the auger device can be moved to the storage position in parallel while preventing excessive tension from being applied to the storage rope, thereby shortening the time required for the auger storage operation.

[0014] Furthermore, the earth auger device has an extendable structure, and the earth auger storage control device moves the earth auger device to the storage position on the condition that the earth auger device is in a completely contracted state, so the earth auger device can be stored in a more compact state. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a side view of the hole digging pole erection vehicle according to the present embodiment. [Figure 2] FIG. 2 is a plan view of the above-mentioned hole-digging pole-setting vehicle. [Figure 3] This shows the state in which the earth auger device of the above-mentioned hole digging pole erection vehicle is suspended and supported at the tip of the boom. [Figure 4] FIG. 2 is a front view showing the appearance of the storage device for the earth auger device. [Figure 5] FIG. 2 is an exploded perspective view of the earth auger device. [Figure 6] 3A and 3B are external views showing the earth auger device in a fully contracted state and a fully extended state. [Figure 7] 10A and 10B are diagrams illustrating the movement of each part of the storage device when the earth auger device is stored. [Figure 8] FIG. 2 is a block diagram showing the configuration of a control system that controls each part of the above-mentioned hole-digging pole-setting vehicle. [Figure 9] 10 is a flowchart showing the content of an auger storage process control executed when the earth auger device is stored. DETAILED DESCRIPTION OF THE INVENTION

[0016] A preferred embodiment of the present invention will be described below with reference to the drawings. First, the overall configuration of a hole-digging pole-setting vehicle 1 according to this embodiment will be described with reference to Figs. 1 to 3. Here, Fig. 1 is a left side view of the hole-digging pole-setting vehicle 1 according to this embodiment, Fig. 2 is a plan view of the hole-digging pole-setting vehicle 1, and Fig. 3 is a diagram showing the appearance of the auger device provided on the hole-digging pole-setting vehicle 1. Note that in Figs. 1 to 3, the same components are given the same reference numerals. Furthermore, in the following description, the front-rear and up-down directions follow the arrows shown in Fig. 1, and the front-rear and left-right directions follow the arrows shown in Fig. 2.

[0017] As shown in FIG. 1, the pole-digging vehicle 1 has a driver's cabin 3 at the front of the vehicle body 2 and is based on a truck vehicle capable of traveling on a pair of front and rear wheels 5f and 5r located at the front and rear of the vehicle body 2. Jack devices 10 are provided on the front, rear, left, and right sides of the vehicle body 2 to lift and support the vehicle body 2 when performing work. The jack devices 10 are comprised of a pair of front jacks 10f located behind the front wheels 5f and a pair of rear jacks 10r located behind the rear wheels 5r. Each jack 10f, 10r lifts and supports the vehicle body 2 by driving a jack cylinder 11 located inside it to extend downward, thereby stabilizing the entire vehicle. These jack devices are operated by operating a jack operating device 12 (see FIG. 2) located at the rear of the vehicle body 2.

[0018] A swivel base 20 is provided in the mounting area behind the driver's cabin 3 of the vehicle body 2. The swivel base 20 is configured to be able to rotate horizontally about a vertical axis and is rotated by a rotation motor 24. A base end of a boom 30 is attached to a support 21 extending upward from the swivel base 20 via a foot pin 22 so that the boom 30 can swing (raise and lower) in the vertical direction. Also provided in the mounting area of ​​the vehicle body 2 is a boom rest 25 that protrudes upward and comes into contact with the underside of the boom 30 when it is lowered in the fully retracted state to store and hold the boom 30.

[0019] The boom 30 has a configuration in which a base boom 30a, an intermediate boom 30b, and a tip boom 30c are nested together in this order from the swivel base 20 side forward, and a telescopic cylinder 31 installed inside the boom 30 extends and retracts, allowing the boom 30 to extend and retract in the axial direction (longitudinal direction). In addition, a derricking cylinder 23 is installed between the base boom 30a and the support column 21, and by extending and retracting this derricking cylinder 23, the entire boom 30 can be raised and lowered in the vertical plane.

[0020] A winch device 40 is attached to the upper surface of the base end of the base boom 30a. The winch device 40 has a winch drum 41, a wire rope 42 (see FIG. 2), and a winch motor 43. A wire guard 44 is provided on the top of the boom 30 along the axial direction of the boom 30 to protect the wire rope 42. The wire rope 42, which is paid out from the winch drum 41, is looped around a sheave (not shown) provided at the tip of the boom 30 and hangs down from the tip of the tip boom 30c as shown in FIG. 3, with a hook 45 attached to its tip. The winch motor 43 provided on the side of the winch device 40 is driven to rotate the winch drum 41, thereby winding or unwinding the wire rope 42, and thereby winding up or lowering the hook 45 at the tip of the wire rope 42.

[0021] As shown in FIG. 3, a support frame 51 is provided at the tip of the boom 30, and this support frame 51 can be selectively connected to either the tip of the distal boom 30c or the tip of the proximal boom 30a. A hydraulic auger motor 54 equipped with a reducer is pivotally connected to the support frame 51 via a support arm 52 and a base frame 53 so as to be swingable. During operation, the auger motor 54 is suspended by the support frame 51, support arm 52, and base frame 53 with its output shaft 54a facing downward. A shaft portion 73 of the earth auger device 70 can be detachably connected to the output shaft 54a of the auger motor 54 via a joint member 55 and a rectangular shaft 56 (see FIG. 5), which will be described later. In the following description, the swivel base 20, boom 30, winch device 40, and earth auger device 70 will also be collectively referred to as the "working device."

[0022] 2, an operator seat 60 for an operator to operate the work devices (swivel base 20, boom 30, winch device 40, and earth auger device 70) is provided on the swivel base 20 of the vehicle body 2. The operator seat 60 has a base board 61 attached to the side of the swivel base 20 and swivels together with the swivel base 20, a chair 62 disposed on top of the base board 61 and on which the operator sits facing the tip of the boom 30, an operating device 63 located in front of the chair 62, and an auger retraction switch 64 (described later) provided on the right side of the chair 62, so that the operator can access the operating device 63 and the auger retraction switch 64 while sitting in the chair 62.

[0023] The shaft 73 of the earth auger device 70, which is connected to the output shaft 54a of the auger motor 54 by the support frame 51, support arm 52, and base frame 53, can be displaced between a working position (see FIG. 3) in which it faces downward together with the output shaft 54a of the auger motor 54 and a stored position (see FIG. 1) in which it faces along the side of the base boom 30a together with the output shaft 54a of the auger motor 54. As shown in FIGS. 1 and 3, a holding device 32 is disposed on the side of the base boom 30a, which can fix and hold the shaft 73 of the earth auger device 70 in a stored position to the side of the base boom 30a. As will be described later, one end of a holding rope 59 is fixed to the holding device 32, and the other end of the holding rope 59 is detachably attached to the shaft 73. The earth auger device 70 can be moved from the working position to the stored position by rotating the auger motor 54 and winding up the holding rope 59 around the shaft 73. Hereinafter, the rotation of the auger motor 54 and the shaft portion 73 in the direction of winding up the holding rope 59 will be referred to as "forward rotation" or "forward rotation," and the rotation of the auger motor 54 and the shaft portion 73 in the direction of unwinding the holding rope 59 will be referred to as "reverse rotation" or "reverse rotation."

[0024] FIG. 4 shows a front view of the holding device 32 as viewed from the front. As shown in this figure, the holding device 32 has a storage space 32a that stores the shaft portion 73 and a rope fixing portion 32b to which one end of the holding rope 59 is fixed. A cam 33 for holding the shaft portion 73 is provided near the entrance of the storage space 32a. The cam 33 is attached inside the holding device 32 so as to be rotatable in the direction of the arrow in FIG. 4 around a rotation axis C and is biased by a tension spring 34 to rotate clockwise. The clockwise rotation of the cam 33 is limited by a stopper 35 formed inside the holding device 32. As a result, when the shaft portion 73 is not stored in the holding device 32, the cam 33 remains in a position where its tip portion protrudes into the storage space 32a, as shown in FIG. 4. However, when the shaft portion 73 enters the storage space 32a and passes the position of the cam 33, the cam 33 rotates counterclockwise and retracts into the holding device 32. 4 again by the bias of the tension spring 34, and supports the shaft portion 73 (details will be described later). Here, in this embodiment, the position where the shaft portion 73 is supported by the cam 33 in the accommodation space 32a is referred to as the storage position of the shaft portion 73.

[0025] A storage detector 36 is provided inside the holding device 32 to detect when the shaft portion 73 is in the retracted position. This storage detector 36 may be a proximity sensor or a limit switch capable of detecting the shaft portion 73 in the retracted position. An overwinding prevention valve 37 is also provided inside the holding device 32 at the deepest position of the storage space 32a. The overwinding prevention valve 37 has an actuator 37a that protrudes into the storage space 32a from the deepest position. When the shaft portion 73 enters the storage space 32a and rises, abutting and pressing against the actuator 37a, the overwinding prevention valve 37 cuts off the hydraulic oil supplied to the auger motor 54, forcibly stopping the rotation of the auger motor 54. The position of the shaft portion 73 when the auger motor 54 is stopped by the overwinding prevention valve 37 is referred to as the upper limit winding position. Furthermore, while the actuator 37a is pressed in, the auger motor 54 can only rotate in the reverse direction.

[0026] Inside the holding device 32, an upper winding limit detector 38 is provided near the overwinding prevention valve 37 to detect when the shaft portion 73 is at the upper winding limit position. This upper winding limit detector 38 may be a proximity sensor or a limit switch that can detect the shaft portion 73 at the upper winding limit position, or it may be a limit switch or hydraulic sensor that detects the operation of the overwinding prevention valve 37. Furthermore, inside the holding device 32, a tension sensor 39 (see Figure 8) that detects the tension of the holding rope 59 is provided.

[0027] Next, the configuration of the earth auger device 70 will be described with reference to Figure 5. The earth auger device 70 is mainly composed of an auger motor 54, a prismatic shaft 56, a shaft portion 73 connected to the prismatic shaft 56, and an earth auger portion 71 coupled to the tip of the shaft portion 73. The prismatic shaft 56 is connected to the output shaft 54a of the auger motor 54 by a joint member 55, and when the auger motor 54 is driven to rotate in this state, the prismatic shaft 56 and the earth auger portion 71 can rotate integrally. In addition, a plurality of set holes 57 are formed on the side of the prismatic shaft 56, into which the tip of a set pin handle 76, described below, can be inserted.

[0028] The shaft portion 73 is formed in the shape of a hollow shaft, and a shaft fitting portion 75 is formed at the base end of the shaft portion 73. The shaft fitting portion 75 has a rectangular hole formed therein into which the rectangular prismatic shaft 56 can be inserted, and the tip end of the rectangular prismatic shaft 56 is removably insertable. A set pin handle 76 is attached to the outer periphery of the base end of the shaft portion 73, and the shaft portion 73 of the earth auger device 70 is detachably connected to the rectangular prismatic shaft 56 by removably inserting the tip end of the set pin handle 76 into one of the set holes 57 of the rectangular prismatic shaft 56 inserted into the shaft fitting portion 75. As a result, by appropriately selecting the set hole 57 into which the tip end of the set pin handle 76 is inserted, the extension amount of the earth auger device 70 can be appropriately adjusted depending on the depth of the hole to be excavated, within a range from the fully retracted state shown in FIG. 6( a) to the fully extended state shown in FIG. 6( b). As shown in FIG. 5, the joint member 55 is provided with a proximity sensor 58 that can detect the position of the auger screw 74, and is configured so that it can be determined whether the earth auger device 70 is in a fully retracted state based on the output of the proximity sensor 58.

[0029] A rope locking portion 73a is formed on the outer periphery of the middle portion of the shaft portion 73, near the auger screw 74. The rope locking portion 73a is formed in an L-hook shape and is capable of releasably locking the other end of the holding rope 59. One end of the holding rope 59 is fixed to the rope fixing portion 32b of the holding device 32 shown in FIG. 4. The earth auger portion 71 is composed of an auger main body portion 72, a base end digging blade portion 77, an intermediate digging blade portion 78, and a tip end digging blade portion 79, and is configured to rotate around the shaft portion 73 by operation of the auger motor 54. The auger main body portion 72 is mainly composed of an auger screw 74 that is connected to the outer periphery of the tip end of the shaft portion 73 and extends spirally. The auger screw 74 rotates in the excavation direction around the shaft portion 73 to transport excavated soil upward. The base end digging blade portion 77 is connected to the tip of the shaft portion 73, the intermediate digging blade portion 78 is connected to the tip of the base end digging blade portion 77, and the tip end digging blade portion 79 is connected to the tip of the intermediate digging blade portion 78. The base end digging blade portion 77 has a digging blade (not shown) with an acute angle in cross section, which is configured to enable efficient digging of the ground.

[0030] Next, with reference to FIG. 7 , the movement of each part when the shaft portion 73 is held in the holding device 32 during the process of storing the earth auger apparatus 70 will be described. As described above, when the auger motor 54 rotates the shaft portion 73 in the forward direction to wind the holding rope 59 around the shaft portion 73, the shaft portion 73 rises toward the storage space 32a of the holding device 32, as shown in FIG. 7( a). The arrow shown on the shaft portion 73 in FIG. 7( a) indicates the direction of forward rotation. Eventually, the shaft portion 73 comes into contact with the cam 33 and continues to rise. As shown in FIG. 7( b), this causes the cam 33 to rotate counterclockwise against the biasing force of the tension spring 34, pushing it into the holding device 32. The shaft portion 73 then rises within the storage space 32a. When the shaft portion 73 passes the position of the cam 33, the cam 33 rotates clockwise due to the biasing force of the tension spring 34, and the tip of the cam 33 again protrudes into the storage space 32a.

[0031] Then, as shown in FIG. 7(c), when the shaft portion 73 presses the actuator 37a of the overwinding prevention valve 37, the overwinding prevention valve 37 activates, cutting off the hydraulic oil supplied to the auger motor 54 and stopping the rotation and lifting of the shaft portion 73. At this time, the upper winding limit detector 38 detects that the shaft portion 73 is in the upper winding limit position. From this state, the auger motor 54 is rotated in the reverse direction (in the direction of the arrow in FIG. 7(c)) to unwind the retaining rope 59 wound around the shaft portion 73, and as shown in FIG. 7(d), the shaft portion 73 is lowered and abuts against the tip of the cam 33 protruding into the storage space 32a. This causes the cam 33 to support the shaft portion 73 so that it does not fall out of the storage space 32a. At this time, the storage detector 36 also detects that the shaft portion 73 is in the storage position.

[0032] To remove the shaft 73 from the holding device 32, first rotate the auger motor 54 in the reverse direction by about one-third of a turn while the shaft 73 is in the storage position shown in FIG. 7(d). This unwinds the holding rope 59 wound around the shaft 73, slackening the holding rope 59. Next, rotate the auger motor 54 in the forward direction by about one-quarter of a turn. At this time, because the holding rope 59 is slack, the shaft 73 does not rise and instead rotates forward in place. This forward rotation of the shaft 73 rotates the cam 33 counterclockwise, pushing the tip of the cam 33 into the holding device 32. As a result, the shaft 73 loses support from the cam 33 and descends from the storage space 32a of the holding device 32 by the amount of slack in the holding rope 59. The auger motor 54 is then rotated in the reverse direction to unwind the holding rope 59 wound around the shaft 73, allowing the earth auger device 70 to move to the working position.

[0033] Next, with reference to the block diagram shown in FIG. 8, the configuration related to operation control of the pole digging vehicle 1 of this embodiment will be described. In this embodiment, a controller 100 controls the operation of the jack unit 10, swivel base 20, boom 30, winch unit 40, and earth auger unit 70. The controller 100 controls the operation of each hydraulic actuator, such as the jack cylinder 11, derrick cylinder 23, swing motor 24, telescopic cylinder 31, winch motor 43, and auger motor 54, based on the operation of various control levers provided on the operation device 63. An electromagnetic proportional control valve is provided in the hydraulic unit 90 corresponding to each hydraulic actuator. The controller 100 controls the electromagnetic proportional control valve corresponding to each hydraulic actuator in response to operation signals output from the various control levers provided on the operation device 63, thereby controlling the supply direction and amount of hydraulic oil supplied from the hydraulic pump 91 to each hydraulic actuator and the operating direction and operating speed of each hydraulic actuator.

[0034] Hydraulic oil in a hydraulic oil tank 92 is supplied to a hydraulic unit 90 by a hydraulic pump 91, and this hydraulic pump 91 is operated by the driving force of the engine 4 for propelling the vehicle body 2. That is, a power take-off mechanism 7 is incorporated in a transmission 6 of the engine 4, and when a PTO operation lever 8 inside the driver's cabin 3 is operated from off to on, a mechanical section of the power take-off mechanism 7 is operated and the driving force of the engine 4 is transmitted to the hydraulic pump 91. On the other hand, when the PTO operation lever 8 is operated from on to off, the driving force of the engine 4 is transmitted to the rear wheels 5r of the vehicle body 2. The transmission 6 is an automatic transmission with multiple ranges, and is designed to perform gear change control according to the range selected by a selector lever (not shown) provided inside the driver's cabin 3.

[0035] The controller 100 receives inputs of the on / off signal of the auger retracting switch 64 located on the right side of the chair 62 shown in Figure 2, detection signals output from the retraction detector 36 and the winding upper limit detector 38 shown in Figure 4, and a detection signal output from the tension sensor 39 that detects the tension of the holding rope 59. The controller 100 also receives inputs of a detection signal output from the proximity sensor 58 shown in Figure 5, as well as detection signals output from the boom hoisting angle sensor 80 that detects the boom hoisting angle of the boom 30 and the extension amount sensor 81 that detects the extension amount of the boom 30.

[0036] The controller 100 controls the operation of the various hydraulic actuators described above in response to operation signals output from the various operation levers of the operating device 63 shown in Figure 2, and also performs an auger storage process for storing the earth auger device 70 when the auger storage switch 64 described above is turned on. In this auger storage process, the boom 30 and auger motor 54 are controlled based on the detection signals output from the storage detector 36, upper winding limit detector 38, tension sensor 39, proximity sensor 58, hoisting angle sensor 80, and extension amount sensor 81 described above.

[0037] Next, the details of the auger storage process described above will be explained with reference to the flowchart shown in FIG. 9. When performing storage work for the earth auger device 70, if the earth auger device 70 is extended, the worker places the earth auger device 70 in a fully retracted state. Specifically, the worker operates the boom 30 to stand the earth auger device 70 on the ground, and in this state, the worker aligns the set pin handle 76 shown in FIG. 5 with the unlocked position and pulls it toward him, then rotates the set pin handle 76 90 degrees to the locked position. This maintains the unlocked state, allowing the rectangular shaft 56 to move freely up and down relative to the shaft portion 73. Next, the boom 30 is lowered to place the earth auger device 70 in a fully retracted state, and the set pin handle 76 is returned 90 degrees to the unlocked position. After that, the tip of the set pin handle 76 is aligned with the setting hole 57 and the set pin handle 76 is pushed in. The set pin handle 76 is then rotated 90 degrees to the locked position, maintaining the fully retracted state.

[0038] Next, the worker engages the other end of the holding rope 59 with the rope engaging portion 73a shown in FIG. 5 and turns on the auger retraction switch 64 provided on the right side of the chair 62 shown in FIG. 2. This causes the controller 100 to start the auger retraction process shown in FIG. 9. First, the controller 100 determines whether the earth auger device 70 is in the fully retracted state based on the detection signal of the proximity sensor 58 (step S1). Specifically, based on the detection signal of the proximity sensor 58, it determines whether the position of the auger screw 74 is the position in which the earth auger device 70 is in the fully retracted state. If the position of the auger screw 74 is not the position in which the earth auger device 70 is in the fully retracted state, the determination result in step S1 is NO, and the controller 100 notifies the worker that the earth auger device 70 is not in the fully retracted state (step S2).

[0039] Next, it is determined whether the auger retraction switch 64 shown in FIG. 2 has been turned on again (step S3). If the auger retraction switch 64 has not been turned on again, the determination result is NO, and the determination process of step S3 is repeated thereafter until the auger retraction switch 64 is turned on again. If the auger retraction switch 64 is turned on again in this state, the determination result of step S3 becomes YES, and the process returns to the determination process of step S1. In this way, the process of step S2 allows the operator to notice that the earth auger device 70 is not in the fully retracted state. Furthermore, if the operator turns on the auger retraction switch 64 again after turning the earth auger device 70 in the fully retracted state, the controller 100 again proceeds to the determination process of step S1 and resumes the auger retraction process of FIG. 9.

[0040] In the determination process of step S1, if the position of the auger screw 74 is the position in which the earth auger device 70 is fully retracted, the determination result of step S1 becomes YES, and the controller 100 starts the retraction movement of the telescopic cylinder 31, and starts the retraction movement of the boom 30 (step S4). This retraction movement of the telescopic cylinder 31 continues until it is stopped by the controller 100. Once the telescopic cylinder 31 starts the retraction movement, the controller 100 determines whether the boom 30 is fully retracted (step S5). If the boom 30 is not fully retracted, the determination result becomes NO, and the determination process of step S5 is repeated. Note that the retraction movement of the telescopic cylinder 31 continues during this time. Then, once the boom 30 is fully retracted, the determination result of step S5 becomes YES, and the controller 100 stops the retraction movement of the telescopic cylinder 31 (step S6).

[0041] Next, the controller 100 starts the extension of the hoisting cylinder 23, thereby starting the raising and lowering of the boom 30 (step S7), and also starts the forward rotation of the auger motor 54 (step S8). This extension of the hoisting cylinder 23 and the forward rotation of the auger motor 54 continue until stopped by the controller 100. Next, the controller 100 determines whether the tension of the holding rope 59 has reached a predetermined value or greater based on the detection signal of the tension sensor 39 (step S10). Here, the "predetermined tension" refers to a tension at which the holding rope 59 can be considered to be free of slack. If the tension of the holding rope 59 is less than the predetermined value, the determination result of step S10 is NO, and the controller 100 returns to the determination process of step S9. As a result, the determination process of step S9 (whether the boom hoisting angle is less than 60°) is repeatedly executed while the tension of the holding rope 59 remains below the predetermined value. During this time, the boom raising and lowering and the forward rotation of the auger motor 54 continue.

[0042] If the tension in the holding rope 59 becomes equal to or greater than a predetermined value while the processes of steps S9 and S10 are repeatedly executed, the determination result in step S10 becomes YES, and the controller 100 stops the forward rotation of the auger motor 54 (step S11). Then, based on the detection signal of the tension sensor 39, it is determined whether the tension in the holding rope 59 has become less than a predetermined value (step S12). If the tension in the holding rope 59 has become equal to or greater than the predetermined value, the determination result becomes NO, and the determination process of step S12 is repeated. At this time, the boom 30 is raised while the earth auger device 70 is swingably supported hanging down at the tip of the boom 30, so the angle formed between the boom 30 and the earth auger device 70 gradually narrows, and the distance between them decreases. As a result, the holding rope 59 slackens and its tension decreases. When the tension in the holding rope 59 becomes less than the predetermined value, the determination result in step S12 becomes YES, and the process returns to step S8, and the forward rotation of the auger motor 54 resumes.

[0043] As described above, steps S8 to S12 are repeatedly executed until the hoisting angle of the boom 30 reaches 60° or greater, so that the raising and lowering of the boom 30 and the forward rotation of the auger motor 54 are performed in parallel. Also, during this time, if the tension in the holding rope 59 exceeds a predetermined value, the forward rotation of the auger motor 54 is temporarily stopped until the tension in the holding rope 59 falls below the predetermined value.

[0044] If the boom hoisting angle reaches 60° or more while the processes of steps S8 to S12 are being repeated, the determination result in step S9 becomes NO, and the controller 100 stops the extension of the hoisting cylinder 23 to stop the raising and lowering of the boom 30 (step S13). Meanwhile, the auger motor 54 continues to rotate in the forward direction since it started to rotate in the forward direction in step S8, and in this state the controller 100 determines whether the shaft portion 73 has reached the upper winding limit position (see FIG. 7(c)) based on the detection signal of the upper winding limit detector 38 (step S14).

[0045] In the determination process of step S14, if the shaft portion 73 has not reached the upper winding limit position, the determination result of step S14 becomes NO, and the controller 100 repeats the determination process of step S14 until the shaft portion 73 reaches the upper winding limit position. When the shaft portion 73 reaches the upper winding limit position, the determination result of step S14 becomes YES, and the controller 100 stops the forward rotation of the auger motor 54 (step S15), and then rotates the auger motor 54 in the reverse direction (step S16). As a result, the holding rope 59 that was wound around the shaft portion 73 is unwound, and the shaft portion 73 gradually descends.

[0046] Next, the controller 100 determines whether the shaft portion 73 has reached the storage position based on the detection signal from the storage detector 36 (step S17). If the shaft portion 73 has not reached the storage position, the determination result becomes NO and the determination process of step S17 is repeated. Then, when the storage detector 36 detects that the shaft portion 73 has reached the storage position, the determination result of step S17 becomes YES, and the controller 100 stops the reverse rotation of the auger motor 54 (step S18), thereby ending the auger storage process shown in FIG.

[0047] In the flowchart of FIG. 9, the processing of steps S1 to S3 may be omitted, and in such a configuration, the proximity sensor 58 may be omitted. Also, by the processing of steps S17 and S18, the reverse rotation of the auger motor 54 is stopped when the shaft portion 73 reaches the storage position. However, the reverse rotation of the auger motor 54 may be stopped when a predetermined time has elapsed since the auger motor 54 started to rotate reversely. In such a configuration, the storage detector 39 may be omitted. Furthermore, when the auger motor 54 and the boom 30 are operating in parallel, the processing of temporarily stopping / restarting the auger motor 54 based on the detection signal of the tension sensor 39 (steps S10 to S12) may be omitted. In such a configuration, the tension sensor 39 may be omitted.

[0048] In the embodiment described above, the holding rope 59 is stretched between the boom 30 and the earth auger device 70, and the earth auger device 70 is moved from the working position to the storage position by winding up the holding rope 59 using the shaft portion 73. However, instead of this, the earth auger device 70 may be moved from the working position to the storage position by, for example, a hydraulic actuator. In such a configuration, the hydraulic actuator is controlled instead of the auger motor 54 in the auger storage process shown in Figure 9. [Explanation of symbols]

[0049] 1 Hole digging pole erecting vehicle 2. Body 23 Elevating cylinder 30 Boom 31 Telescopic cylinder 32 Holding device 36 Storage detector 37 Overwinding prevention valve 38 Winding upper limit detector 39 Tension Sensor 54 Auger motor 58 Proximity Sensor 70 Earth Auger Device 73 Shaft section 80 Elevation angle sensor 81 Extension sensor 100 Controllers

Claims

1. A drivable vehicle body, a boom provided on the vehicle body and capable of extending and retracting and raising and lowering; an earth auger device attached to the tip of the boom in a swingable state in a hanging state; an earth auger storage control device that moves the earth auger device to a storage position that is approximately parallel to the boom, The earth auger storage control device is A hole digging and pole erection vehicle characterized by controlling the boom to be retracted until it reaches a predetermined extension amount, the boom to be raised and lowered until it reaches a predetermined elevation angle, and when the boom has reached the predetermined extension amount and the predetermined elevation angle, the earth auger device to be moved to the stored position.

2. The earth auger device is a motor unit attached to the tip of the boom so as to be swingable in a state where the motor unit hangs down with the output shaft facing downward; a long rod-shaped shaft portion attached to the output shaft of the motor portion; a screw portion formed in a spiral shape on the outer periphery of the lower part of the shaft portion; a storage rope having one end attached to the boom and the other end detachably attached to the outer periphery of the upper part of the shaft portion, The hole-digging and pole-setting vehicle described in claim 1, characterized in that the earth auger storage control device drives the motor unit to rotate the earth auger device and winds the storage rope around the upper outer periphery of the shaft unit, thereby moving the earth auger device to the storage position.

3. The earth auger storage control device is a tension detector for detecting the tension of the storage rope; A hole-digging and pole-setting vehicle as described in claim 2, characterized in that while the boom is being raised and lowered to the predetermined raising and lowering angle, the motor unit is driven to wind the storage rope around the upper outer periphery of the shaft unit, and when the tension detector detects that the tension of the storage rope is equal to or greater than a predetermined value, the driving of the motor unit is temporarily stopped, and when the tension of the storage rope falls below the predetermined value due to the raising and lowering of the boom, the motor unit is driven again.

4. The earth auger device has an extendable structure, An expansion / contraction amount detector is provided to detect the expansion amount of the earth auger device, The earth auger storage control device is A hole-digging and pole-setting vehicle as described in either claim 2 or 3, characterized in that the earth auger device is moved to the stored position on the condition that the expansion / contraction amount detector detects that the earth auger device has been completely retracted.

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