Earth drill machine, attachment, and attachment replacement method

Abstract

To provide an earth drill machine allowing replacement work between a boom type earth drill machine and a leader type earth drill machine to be carried out only by replacement of front attachments.SOLUTION: An earth drill machine (1) is provided with a body (10) and attachments (100, 200) attached on the body, wherein the body has an attachment attaching part (20) for attaching the attachments, and the attachment attaching part is configured to allow a boom type attachment or a leader type attachment to be selectively attached.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an earth drill machine, an attachment for use with an earth drill machine, and a method for changing the attachment. [Background technology]

[0002] Conventionally, earth drill machines used in cast-in-place pile construction methods are classified into boom type and leader type. For example, Patent Document 1 is known as a leader type earth drill machine. For example, Patent Document 2 is known as a boom type earth drill machine. The boom type is excellent for auxiliary crane work, and the leader type is excellent for excavation work in hard ground. Therefore, it is common to use different types of earth drill machines depending on the work site and construction method. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4069049 [Patent Document 2] Patent No. 2589232 Summary of the Invention [Problem to be solved by the invention]

[0004] When changing earth drill machines due to on-site conditions, the changeover work was extensive and reduced work efficiency.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, a main object of the present invention is to provide an earth drill machine that can easily switch between a boom type earth drill machine and a leader type earth drill machine. [Means for solving the problem]

[0006] In order to achieve the above object, a representative embodiment of the present invention is an earth drill machine including a main body and an attachment attached to the main body for connecting a drilling tool, the attachment being selectable from a boom-type attachment and a leader-type attachment, the main body having an attachment mounting section including a common connecting section for selectively mounting the boom-type attachment and the leader-type attachment, the boom-type attachment and the leader-type attachment each having an attachment main body and a subframe supporting the attachment main body and mounted to the attachment mounting section, the attachment mounting section being configured to selectively mount the subframe of the boom-type attachment and the subframe of the leader-type attachment using the connecting section. The subframe of the boom type attachment and the subframe of the leader type attachment each have a common attachment receiving attachment portion that is attached to the connecting portion of the attachment attachment portion by a common connecting member, and the attachment receiving attachment portion of the boom type attachment and the attachment receiving attachment portion of the leader type attachment can be connected to the attachment attachment portion of the main body by the common connecting member, and the boom type attachment and the leader type attachment each have a plurality of actuators that change the attitude of the attachment, and at least a portion of the plurality of actuators of the boom type attachment and the leader type attachment are attached to the respective subframes. It is characterized by the fact that

[0007] According to the present invention, the boom type earth drill machine and the leader type earth drill machine can be easily replaced. Note that the problems, configurations and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of an earth drill machine with a leader-style front attachment attached. [Diagram 2] FIG. 1 is a side view of an earth drill machine with a boom-type front attachment attached. [Diagram 3] FIG. 2 is a side view of the body of the earth drill machine. [Figure 4] 4 is a side view of an attachment mounting portion provided on the main body. FIG. [Diagram 5] FIG. 2 is an enlarged view showing a main part including a subframe of a leader-type front attachment. [Figure 6] FIG. 2 is an enlarged view showing a main part including a subframe of a boom-type front attachment. [Figure 7]FIG. 2 is a hydraulic circuit diagram of the earth drill machine with a boom-type front attachment attached. [Figure 8] FIG. 13 is a configuration diagram showing the input / output of the controller when a boom-type front attachment is attached. [Figure 9] FIG. 1 is a hydraulic circuit diagram of an earth drill machine with a leader-type front attachment attached. [Figure 10] FIG. 13 is a configuration diagram showing the input / output of the controller when a reader-type front attachment is attached. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a side view of an earth drill machine 1 to which a leader-type front attachment 100 is attached. Fig. 2 is a side view of the earth drill machine 1 to which a boom-type front attachment 200 is attached. Fig. 3 is a side view of a main body 10 of the earth drill machine 1. Fig. 4 is a side view of an attachment mounting portion 20 provided on the main body 10.

[0010] (Earth drill machine 1) As shown in Figures 1 and 2, the earth drill machine 1 according to this embodiment is configured so that a leader-type front attachment 100 or a boom-type front attachment 200 can be selectively attached to a main body 10 consisting of a traveling body 2 and a rotating body 3 rotatably supported on the traveling body 2. That is, the earth drill machine 1 according to this embodiment is configured so that it can be changed to two types of specifications, leader type and boom type, simply by replacing the front attachments 100, 200 on the common main body 10. However, the main body 10 is not limited to the combination of the traveling body 2 and the rotating body 3 as long as it can support the front attachments 100, 200.

[0011] The traveling body 2 travels when traveling motors 80, 81 (see FIG. 7) are rotationally driven. The rotating body 3 rotates relative to the traveling body 2 when a rotation motor 82 (see FIG. 7) is rotationally driven. The rotating body 3 mainly includes a cab 4, a counterweight 5, a rear winch 6, and a front winch 7.

[0012] The cab 4 is provided at the front end of the revolving body 3. An internal space is formed in the cab 4 for an operator of the earth drill machine 1 to ride in. The internal space of the cab 4 is also provided with various operating devices (levers, switches) 50-60 (see FIG. 8) for operating the earth drill machine 1. The operator riding in the internal space of the cab 4 operates the operating devices 50-60, whereby the traveling body 2 travels, the revolving body 3 rotates, and the front attachments 100, 200 operate.

[0013] The counterweight 5 is provided at the rear end of the rotating body 3. The counterweight 5 is a heavy weight that balances the weight of the front attachments 100, 200 and the cargo (not shown). The rear winch 6 is driven to rotate by a rear winch hydraulic motor (rear winch drive motor 84 / see FIG. 7) to wind up or lower the Kelly rope 116. The front winch 7 is driven to rotate by a front winch hydraulic motor (front winch drive motor 83 / see FIG. 7) to wind up or lower the auxiliary hoist rope 117. Note that the Kelly rope 116 does not necessarily have to be wound up or lowered by the rear winch 6, and may be wound up or lowered by the front winch 7.

[0014] (Attachment mounting part 20) The revolving body 3 constituting the main body 10 is provided with an attachment mounting portion 20, which is a structure for mounting the front attachments 100, 200. As shown in FIG. 3, the attachment mounting portion 20 is provided on the main frame 3a of the revolving body 3 from the front to the rear. As shown in FIG. 4, the attachment mounting portion 20 is provided with connecting pins 21, 22 for connecting the front attachments 100, 200. These connecting pins 21, 22 are configured to be freely expandable and contractable in their axial direction (direction perpendicular to the paper surface of FIG. 4) in accordance with the expansion and contraction operation of a hydraulic cylinder (not shown). The connecting pins 21, 22 are inserted into pin holes 131, 132 (see FIG. 5) provided in a subframe 130 of the front attachment 100, which will be described later, or pin holes 231, 232 (see FIG. 6) provided in a subframe 230 of the front attachment 200, whereby the front attachments 100, 200 are fixed to the attachment mounting portion 20. The operation of the connecting pins 21, 22 (that is, the extension and contraction of the hydraulic cylinder for driving the connecting pins) is performed by operating an operation switch in the cab 4.

[0015] (Leader-style front attachment 100) The leader-type front attachment 100 is attached to the rotating body 3 via connecting pins 21 and 22. The front attachment 100 performs work according to the operation of the operating device. The work of the front attachment 100 includes an excavation work for excavating the ground using an excavation tool 121, and a lifting work (auxiliary crane work) for raising and lowering a load (not shown) hooked to a hook 122. Details of the front attachment 100 will be described below with reference to Figs. 1 and 5. Fig. 5 is an enlarged view of the main parts including the subframe 130 of the leader-type front attachment 100, and shows the posture of the front attachment 100 when disassembled.

[0016] 1 and 5, the front attachment 100 has an attachment body and a subframe 130. The attachment body includes a leader 110, a front frame 112, a triangle frame 111, a front stay 126, a pin 123, a leader head 113, a main winding sheave 114, an auxiliary winding sheave 115, a main winding rope 116, an auxiliary winding rope 117, a kelly bar 118, a kelly top guide 119, a rotary drive 120, a front frame hoisting cylinder 128, a stay cylinder 124, a thruster cylinder 127, an excavation tool 121, a hook 122, and a guide sheave 125. The subframe 130 is a structure that is attached to the attachment mounting portion 20 provided on the rotating body 3.

[0017] The leader 110 is a long tubular member. The leader 110 is displaced between an excavation posture in which it stands vertically to the ground and a forward tilted posture that is tilted forward from the excavation posture. The forward tilt angle of the leader 110 is, for example, 7° with respect to the vertical direction. A leader head 113 is attached to the upper end of the leader 110. Furthermore, the leader 110 supports a kelly top guide 119 and a rotary drive 120 so that they can be raised and lowered along the extension direction.

[0018] The subframe 130 connects the lower ends of the front frame 112, front frame hoisting cylinder 128, and front stay 126, and supports the leader 110 (see FIG. 5). The subframe 130 has pin holes (attachment mounting portions) 131, 132 on the front and rear. The front attachment 100 is attached to the rotating unit 3 by inserting connecting pins 21, 22 provided on the attachment mounting portion 20 of the rotating unit 3 into these pin holes 131, 132.

[0019] The front frame 112 is supported on the rotating body 3 via the subframe 130 so that it can be raised and lowered. A triangle frame 111 is provided at the tip of the front frame 112. This triangle frame 111 is supported by a front stay 126. The leader 110 is connected to the triangle frame 111 via a pin 123. In this way, the leader 110 is supported by the front frame 112, the front stay 126, and the triangle frame 111 so that it can be raised and lowered.

[0020] The front frame 112 and the rotating bed 3 are connected via a front frame raising / lowering cylinder 128. When the front frame raising / lowering cylinder 128 extends, the front frame 112 rises, and when the front frame raising / lowering cylinder 128 contracts, the front frame 112 falls. The leader 110 and the triangle frame 111 are connected via a stay cylinder 124. When the stay cylinder 124 extends, the leader 110 rises around the pin 123, and when the stay cylinder 124 contracts, the leader 110 falls around the pin 123.

[0021] The leader head 113 is attached to the upper end (tip) of the leader 110. The leader head 113 supports a main winding sheave 114 and an auxiliary winding sheave 115 so that they are rotatable.

[0022] The kelly rope 116 is let out from the rear winch 6, wound around the main winding sheave 114, and hung downward from the front end of the main winding sheave 114. The auxiliary winding rope 117 is let out from the front winch 7, wound around the auxiliary winding sheave 115, and hung downward from the front end of the auxiliary winding sheave 115.

[0023] The kelly bar 118 is a long tubular member. The kelly bar 118 is suspended from the lower end of the main hoisting rope 116 suspended from the front end of the kelly sheave 114. A kelly top guide 119 is attached to the upper end of the kelly bar 118. Furthermore, the lower end of the kelly bar 118 is inserted into the rotary drive 120. Furthermore, a drilling tool 121 is detachably attached to the lower end of the kelly bar 118 that has passed through the rotary drive 120.

[0024] The kelly top guide 119 is supported by the leader 110 above the rotary drive 120 so that it can be raised and lowered. The kelly top guide 119 also rotatably supports the kelly bar 118. Note that "rotation of the kelly bar 118" refers to rotation about a rotation axis extending in the extension direction of the kelly bar 118 (the same applies below).

[0025] The rotary drive (drive device) 120 is supported by the leader 110 below the kelly top guide 119 so as to be able to rise and fall. Specifically, the rotary drive 120 rises and falls in accordance with the extension and contraction of the thruster cylinder 127. The rotary drive 120 also rotatably supports the kelly bar 118. The rotary drive 120 rises and falls by the extension and contraction of the thruster cylinder 127. Furthermore, the rotary drive 120 is equipped with a hydraulic motor (kelly rotary drive motor 85 / see FIG. 9) that rotationally drives the kelly bar 118.

[0026] As a result, when the leader 110 is in an excavation position, the kelly bar 118 is extended vertically by the kelly top guide 119 and the rotary drive 120. When the rear winch 6 winds up the main hoisting rope 116, the kelly bar 118 rises. When the rear winch 6 winds down the main hoisting rope 116, the kelly bar 118 descends. This causes the excavation tool 121 attached to the lower end of the kelly bar 118 to rise and fall. Also, the kelly top guide 119 rises and falls integrally with the kelly bar 118.

[0027] Furthermore, by driving the Kelly rotary drive motor 85 mounted on the rotary drive 120, the Kelly bar 118 and the drilling tool 121 attached to the Kelly bar 118 are rotated. The rotary drive 120 is an example of a drive device that drives the Kelly bar 118 and the drilling tool 121.

[0028] The excavation tool 121 is, for example, an auger that excavates the ground by rotating while being pressed against the ground. However, a specific example of the excavation tool 121 is not limited to an auger as long as it has a function of excavating the ground, and may be a drilling bucket or the like.

[0029] The hook 122 is suspended from the lower end of the auxiliary hoisting rope 117 suspended from the front end of the auxiliary hoisting sheave 115. The hook 122 is configured to be able to hold a load. When the front winch 7 winds up the auxiliary hoisting rope 117, the hook 122 rises. When the front winch 7 winds down the auxiliary hoisting rope 117, the hook 122 descends. This causes the load held by the hook 122 to rise and fall. Any load can be held by the hook 122, and a typical example of the load is a rebar cage to be inserted into a hole excavated by the excavation tool 121.

[0030] (Boom-type front attachment 200) The boom-type front attachment 200 is attached to the rotating body 3 via connecting pins 21 and 22, similar to the leader-type front attachment 100. The boom-type front attachment 200 also performs excavation work and lifting work in accordance with the operation of an operating device, similar to the leader-type front attachment 100. Details of the front attachment 200 will be described below with reference to Figures 2 and 6. Note that Figure 6 is an enlarged view of the main parts including the subframe 230 of the boom-type front attachment 200, showing the posture of the front attachment 200 when disassembled.

[0031] 2 and 6, the front attachment 200 has an attachment main body and a subframe 230. The attachment main body includes a boom 210, a front frame 212, a rotary frame 213, a main hoisting sheave 214, an auxiliary hoisting sheave 215, a main hoisting rope 216, an auxiliary hoisting rope 217, a kelly bar 218, a rotary drive 220, a boom hoisting cylinder 224, a boom telescopic cylinder 228 (not shown in FIG. 2, see FIG. 7), a front frame hoisting cylinder 225, a rotary frame hoisting cylinder 226, a thruster cylinder 227, an excavation tool (not shown), and a hook 222. The subframe 230 is a structure that is attached to the attachment mounting portion 20 provided on the rotating body 3.

[0032] The subframe 230 connects the lower end of the front frame 212 and the lower end of the boom 210, and supports them together with the boom hoisting cylinder 224 and the front frame hoisting cylinder 225 (see FIG. 6). The subframe 230 has pin holes (attachment mounting portions) 231, 232 on the front and rear. The front attachment 200 is attached to the rotating unit 3 by inserting connecting pins 21, 22 provided on the attachment mounting portion 20 of the rotating unit 3 into these pin holes 231, 232.

[0033] The front frame 212 is supported on the boom 210 so as to be able to be raised and lowered via a front frame raising and lowering cylinder 225. A rotary frame 213 is rotatably provided at the tip of the front frame 212. A rotary drive 220 and a thruster cylinder 227 are attached to this rotary frame 213.

[0034] The boom 210 is supported on the rotating body 3 via a subframe 230 so as to be able to rise and fall. In this embodiment, the boom 210 is a telescopic boom type, but may also be a lattice boom type.

[0035] The boom 210 rises or falls relative to the revolving body 3 as the boom hoisting cylinder 224 extends or retracts.

[0036] The boom 210 and the front frame 212 are connected via a front frame raising and lowering cylinder 225, and the angle of the front frame 212 can be adjusted by extending and lowering (operating) the front frame raising and lowering cylinder 225.

[0037] The front frame 212 and the rotary frame 213 are connected via a rotary frame raising and lowering cylinder 226, and the angle of the rotary frame 213 can be adjusted by extending and lowering (operating) the rotary frame raising and lowering cylinder 226.

[0038] The rotary drive 220 rises and falls in accordance with the extension and contraction of the thruster cylinder 227. The kelly bar 218 is suspended from the lower end of the main hoisting rope 216 suspended from the front end of the main hoisting sheave 214, and an excavation tool (not shown) such as a drilling bucket is attached to the tip of the kelly bar 218. The rotary drive 220 rotates the kelly bar 218, causing the excavation tool to excavate the ground. This is similar to the leader-type front attachment 100.

[0039] (Hydraulic circuit configuration) - Boom type - Next, a description will be given of the hydraulic circuit configuration of the earth drill machine 1. For ease of explanation, first, a description will be given of the hydraulic circuit configuration of the earth drill machine 1 when the boom-type front attachment 200 is attached to the main body 10. Fig. 7 is an example of a hydraulic circuit configuration diagram of the earth drill machine 1 in a state where the boom-type front attachment 200 is attached.

[0040] 7, the earth drill machine 1 is equipped with, for example, four variable or fixed displacement hydraulic pumps P1 to P4. The hydraulic pump P1 is connected to hydraulic actuators, namely a travel motor (left) 80, a rear winch drive motor 84, a kelly rotation drive motor 85, and a boom hoisting cylinder 224, via control valves 30, 34, 35, and 39, respectively, and each of the hydraulic actuators 80, 84, 85, and 224 is driven by pressure oil supplied from the hydraulic pump P1.

[0041] The hydraulic pump P2 is connected to the hydraulic actuators, namely the travel motor (right) 81, the front winch drive motor 83, and the boom extension cylinder 228, via control valves 31, 33, and 40, respectively, and each of the hydraulic actuators 81, 83, and 228 is driven by pressure oil supplied from the hydraulic pump P2.

[0042] The hydraulic pump P3 (second hydraulic pump) is connected to the hydraulic actuators, the swing motor 82 and the front frame raising and lowering cylinder 225, via control valves 32, 37, respectively, and each of the hydraulic actuators 82, 225 is driven by pressure oil supplied from the hydraulic pump P3.

[0043] The hydraulic pump P4 (first hydraulic pump) is connected to hydraulic actuators, ie, a thruster cylinder 227 and a rotary frame elevation cylinder 226, via control valves 36, 38, respectively, and each of the hydraulic actuators 227, 226 is driven by pressure oil supplied from the hydraulic pump P4.

[0044] The actuators (hydraulic motors, hydraulic cylinders) connected to the hydraulic pumps P1 to P4 are not limited to the configuration shown in FIG. 7, and the number of hydraulic pumps is not limited to four.

[0045] (Controller 75 Input / Output) -Boom Type- Next, the input / output of the controller 75 will be described. For ease of explanation, first, the input / output of the controller 75 when the boom-type front attachment 200 is attached to the main body 10 will be described. Fig. 8 is a configuration diagram showing the input / output of the controller 75 in a state where the boom-type front attachment 200 is attached. In Fig. 8, dotted lines indicate electric signals, and solid lines indicate hydraulic piping.

[0046] Although not shown, the controller 75 is composed of hardware including a CPU that performs various calculations, a storage device such as a ROM or HDD that stores programs for the CPU to execute the calculations, a RAM that serves as a work area when the CPU executes the programs, and a communication interface that is an interface when transmitting and receiving data to and from other devices, and software that is stored in the storage device and executed by the CPU. Each function of the controller 75 is realized by the CPU loading various programs stored in the storage device into the RAM and executing them.

[0047] In this embodiment, different control programs are stored in the storage device for the leader type front attachment 100 and the boom type front attachment 200, and the CPU switches the control program to be executed depending on the presence or absence of an input signal (predetermined signal) from the boom length meter 70. Specifically, since the boom length meter 70 measures the telescopic length of the boom 210, when data on the length of the boom 210 detected by the boom length meter 70 is input to the controller 75, the CPU determines that the boom type front attachment 200 is attached to the main body 10 and executes the control program for the boom. On the other hand, when there is no input signal from the boom length meter 70, the CPU determines that the leader type front attachment 100 is attached to the main body 10 and executes the control program for the leader. In this way, the controller 75 functions as an identification means for identifying whether it is the front attachment 100 or the front attachment 200. In this embodiment, the signal related to the telescopic operation of the boom 210 is measured by the boom length meter 70 as a signal related to the length of the boom 210, but this is not limited thereto. The amount of extension or contraction of the boom may also be measured.

[0048] 8, operation signals are input to the controller 75 from various operation levers and operation switches (operation devices) provided inside the cab 4. Specifically, operation signals are input to the controller 75 from the left traveling lever 50, right traveling lever 51, swing lever 52, front winch lever 53, rear winch lever 54, kelly rotation lever 55, thruster switch 56, front frame hoist switch 57, rotary frame hoist switch 58, boom hoist lever 59, and boom telescopic lever 60.

[0049] When an operation signal from the travel lever (left) 50 is input to the controller 75, the controller 75 outputs a control signal to the control valve 30. Then, the control valve 30 operates, and pressure oil is supplied from the hydraulic pump P1 to the travel motor (left) 80, and the travel motor (left) 80 is driven. As a result, the travel vehicle 2 travels.

[0050] When an operation signal from the travel lever (right) 51 is input to the controller 75, the controller 75 outputs a control signal to the control valve 31. Then, the control valve 31 operates, and pressure oil is supplied from the hydraulic pump P2 to the travel motor (right) 81, and the travel motor (right) 81 is driven. As a result, the travel vehicle 2 travels.

[0051] When an operation signal from the swing lever 52 is input to the controller 75, the controller 75 outputs a control signal to the control valve 32. Then, the control valve 32 operates, and pressure oil is supplied from the hydraulic pump P3 to the swing motor 82, causing the swing motor 82 to rotate. This causes the swing body 3 to swing.

[0052] When an operation signal from the front winch lever 53 is input to the controller 75, the controller 75 outputs a control signal to the control valve 33. Then, the control valve 33 operates, and pressure oil is supplied from the hydraulic pump P2 to the front winch drive motor 83, causing the front winch drive motor 83 to rotate. This causes the front winch 7 to rotate (auxiliary hoisting crane operation).

[0053] When an operation signal from the rear winch lever 54 is input to the controller 75, the controller 75 outputs a control signal to the control valve 34. Then, the control valve 34 operates, and pressure oil is supplied from the hydraulic pump P1 to the rear winch drive motor 84, causing the rear winch drive motor 84 to rotate. As a result, the rear winch 6 is rotationally driven.

[0054] When an operation signal from the Kelly rotation lever 55 is input to the controller 75, the controller 75 outputs a control signal to the control valve 35. This causes the control valve 35 to operate, supplying pressure oil from the hydraulic pump P1 to the Kelly rotary drive motor 85, causing the Kelly rotary drive motor 85 to rotate. This causes the rotary drive 220 to rotate.

[0055] When an operation signal from the thruster switch 56 is input to the controller 75, the controller 75 outputs a control signal to the control valve 36. Then, the control valve 36 operates, and pressure oil is supplied from the hydraulic pump (first hydraulic pump) P4 to the thruster cylinder 227, causing the thruster cylinder 227 to expand and contract. This causes the rotary drive 220 to move up and down.

[0056] When an operation signal from the front frame hoist switch 57 is input to the controller 75, the controller 75 outputs a control signal to the control valve 37. This causes the control valve 37 to operate, supplying pressure oil from the hydraulic pump P3 to the front frame hoist cylinder 225, causing the front frame hoist cylinder 225 to extend and retract. This causes the front frame 212 to raise or lower.

[0057] When an operation signal from the rotary frame hoist switch 58 is input to the controller 75, the controller 75 outputs a control signal to the control valve 38. This causes the control valve 38 to operate, supplying pressure oil from the hydraulic pump P4 to the rotary frame hoist cylinder 226, causing the rotary frame hoist cylinder 226 to extend and retract. This causes the rotary frame 213 to perform the hoisting operation.

[0058] When an operation signal from the boom hoist lever 59 is input to the controller 75, the controller 75 outputs a control signal to the control valve 39. This causes the control valve 39 to operate, supplying pressure oil from the hydraulic pump P1 to the boom hoist cylinder 224, causing the boom hoist cylinder 224 to extend and retract. This causes the boom 210 to perform a hoisting operation (hoisting operation).

[0059] When an operation signal from the boom telescopic lever 60 is input to the controller 75, the controller 75 outputs a control signal to the control valve 40. This causes the control valve 40 to operate, supplying pressure oil from the hydraulic pump P2 to the boom telescopic cylinder 228, causing the boom telescopic cylinder 228 to telescope. This causes the boom 210 to telescope.

[0060] In this embodiment, the various operating levers 50, 51, 52, 53, 54, 55, 59, 60 on the input side of the controller 75 are illustrated as being electric levers, but of course these may also be hydraulic levers.

[0061] (Hydraulic circuit configuration) -Leader type- Next, a hydraulic circuit configuration of the earth drill machine 1 when the leader-type front attachment 100 is attached to the main body 10 will be described. Fig. 9 is an example of a hydraulic circuit configuration diagram of the earth drill machine 1 when the leader-type front attachment 100 is attached. Note that, in this embodiment, the front attachments 100 and 200 are selectively attached to the common main body 10, so a description of the parts common to Fig. 7 will be omitted.

[0062] As shown in Figure 9, when the leader-type front attachment 100 is attached to the main body 10, the front frame hoisting cylinder 128 is connected to the hydraulic pump P1 in place of the boom hoisting cylinder 224 (see Figure 7), the thruster cylinder 127 is connected to the hydraulic pump P3 in place of the front frame hoisting cylinder (see Figure 7) 225, and the stay cylinder 124 is connected to the hydraulic pump P4 in place of the thruster cylinder 227 (see Figure 7). Note that in the leader-type, as there is no configuration to replace the boom telescopic cylinder 228 and the rotary frame hoisting cylinder 226 (see Figure 7), the connections of the control valve 40 and the control valve 38 are vacant.

[0063] (Controller 75 input / output) -Reader type- Next, the input / output of the controller 75 will be described. Fig. 10 is a configuration diagram showing the input / output of the controller 75 in a state where the reader-type front attachment 100 is attached. Note that, in this embodiment, the front attachments 100 and 200 are selectively attached to a common main body 10, so a description of the parts common to Fig. 8 will be omitted.

[0064] As shown in Figure 10, the input side of the controller 75 has basically the same configuration as in Figure 8. However, for reasons that will be described later, the output destinations for the inputs of the thruster switch 56 and the front frame hoisting switch 57 are changed by the control of the controller 75. In addition, a stay cylinder 124 is connected to the end of the control valve 36, a thruster cylinder 127 is connected to the end of the control valve 37, and a front frame hoisting cylinder 128 is connected to the end of the control valve 39 (also see Figure 9).

[0065] In this embodiment, a hydraulic pump P4 with a sufficient discharge flow rate is used to operate the thruster cylinder 227 constituting the boom-type front attachment 200. However, this hydraulic pump P4 cannot supply a sufficient flow rate of pressurized oil to the thruster cylinder 127 constituting the leader-type front attachment 100. If the flow rate of pressurized oil to the thruster cylinder 127 is insufficient, the speed of the thruster cylinder 127 slows down and workability deteriorates. Therefore, in this embodiment, when attaching the leader-type front attachment 100 to the main body 10, the thruster cylinder 127 is connected to the end of the control valve 37, and the stay cylinder 124 is connected to the end of the control valve 36. That is, pressure oil is supplied to the thruster cylinder 127 from the hydraulic pump P3 (second hydraulic pump). As a result, the flow rate of pressure oil supplied to the thruster cylinder 127 is sufficient.

[0066] However, as shown in Fig. 8, in the case of the boom-type front attachment 200, the control valve 36 is operated by operation of the thruster switch 56, and the control valve 37 is operated by operation of the front frame hoist switch 57. Therefore, in the case of the leader-type front attachment 100, if the controller 75 does not change the output destination for the input, when the operator operates the thruster switch 56, the stay cylinder 124 operates instead of the rotary drive 120 which would normally move up and down. Similarly, since the control valve 37 is connected to the thruster cylinder 127, when the operator operates the front frame hoist switch 57, the leader 110 operates instead of the thruster cylinder 127 which would normally move down.

[0067] This would result in the front attachment 100 operating against the operator's intention, making it difficult to use. Therefore, in this embodiment, when a leader-type front attachment 100 is attached to the main body 10, the controller 75 controls the output destination for inputs from the thruster switch 56 and the front frame hoist switch 57 to change, so that the hydraulic actuator corresponding to the operator's operation operates. In other words, in this embodiment, the controller 75 switches the output destinations of the thruster switch 56 and the front frame hoist switch 57, so that the same excavation operation can be performed with the same operating device without any sense of discomfort in both the leader type and the boom type.

[0068] As described above, according to this embodiment, the following advantageous effects are achieved.

[0069] Since the leader type front attachment 100 and the boom type front attachment 200 can be selectively attached to the main body 10, the boom type earth drill machine can be easily replaced with the leader type earth drill machine by simply exchanging the front attachments 100, 200.

[0070] For example, when replacing the boom-type front attachment 200 with the leader-type front attachment 100, first, the connecting pins 21 and 22 are removed to remove the boom-type front attachment 20 from the attachment mounting part 20 (first step). Then, the subframe 130 of the leader-type front attachment 100 is aligned with the attachment mounting part 20, and the connecting pins 21 and 22 are inserted into the pin holes 131 and 132 to mount the leader-type front attachment 100 to the attachment mounting part 20 (second step). In this way, the specifications of the earth drill machine 1 can be changed by a simple task of simply replacing the front attachments 100 and 200. Reconfiguration work can also be performed on-site, improving work efficiency.

[0071] In addition, the front attachments 100 and 200 have subframes 130 and 230, respectively, and therefore can be attached to the attachment mounting portion 20 of the main body 10. Moreover, the pin holes 131 and 132 of the subframe 130 and the pin holes 231 and 232 of the subframe 230 are designed in common, so that, for example, a boom-type earth drill machine at a work site can be turned into a leader-type earth drill machine simply by replacing the front attachment. Therefore, there is no need to prepare two machines, a boom-type earth drill machine and a leader-type earth drill machine. In other words, while in the past, two types of earth drill machines were required to accommodate various work sites and construction methods, which increased costs, in this embodiment, it is sufficient to prepare and replace only the front attachments 100 and 200, thereby realizing cost reduction.

[0072] In addition, even if the front attachments 100, 200 are interchanged, good operability is maintained because the correspondence between the operating device and the excavation work is consistent. In other words, the operator can perform the operation as intended, and there is no inconvenience in operation due to the interchange of the front attachments 100, 200.

[0073] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention, and all technical matters included in the technical ideas described in the claims are the subject of the present invention. The above-described embodiment shows a preferred example, but a person skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents disclosed in this specification, and these are included in the technical scope described in the attached claims.

[0074] For example, in Fig. 10, the program (software) of the controller 75 controls the change of output destination for input to the thruster switch 56 and the front frame hoist switch 57, but the function of the controller 75 may be realized, for example, as an integrated circuit or other hardware. In this case, by interchanging the electrical wiring connecting the thruster switch 56 and the control valve 36 with the electrical wiring connecting the front frame hoist switch 57 and the control valve 37, it is possible to achieve the same effects as in the above embodiment. Moreover, since it is not necessary to use the controller 75, it is inexpensive. [Explanation of symbols]

[0075] 1 Earth drill machine 2. Running body 3 Rotating body 4 Cab 5 Counterweight 6 Rear winch 7 Front winch 10 Main unit 20 Attachment mounting part 21, 22 Connecting pin 30~40 Control valve 50 Travel lever (left) 51 Travel lever (right) 52 Swivel lever 53 Front winch lever 54 Rear winch lever 55 Kelly Rotating Lever 56 Thruster switch 57 Front frame lowering switch 58 Rotary frame lift switch 59 Boom hoist switch 60 Boom telescopic lever 70 Length Meter 75 Controller (Identification Means) 80 Travel motor (left) 81 Travel motor (right) 82 Swing motor 83 Front winch drive motor 84 Rear winch drive motor 85 Kelly rotary drive motor 100 Front attachment (Leader type attachment) 110 Leader 111 Triangle Frame 112 Front Frame 113 Leader Head 114 Main winding sheave 115 Auxiliary winding sheave 116 Main winding rope 117 Auxiliary rope 118 Kellyba 119 Kelly Top Guide 120 Rotary drive (drive device) 121 Drilling Tools 122 Hook 123 pin 124 Stay Cylinder 125 Tension roller 126 Front stay 127 Thruster Cylinder 128 Front frame lifting cylinder 130 Subframe 131, 132 Pin hole (attachment mounting part) 200 Front attachment (boom type attachment) 210 Boom 212 Front Frame 213 Rotary Frame 214 Main winding sheave 215 Auxiliary sheave 216 Main winding rope 217 Auxiliary rope 218 Kellyba 220 Rotary drive (drive device) 222 Hook 224 Boom derrick cylinder 225 Front frame lifting cylinder 226 Rotary Frame Lifting Cylinder 227 Thruster Cylinder 228 Boom telescopic cylinder 230 Subframe 231, 232 Pin hole (attachment mounting part) P1 Hydraulic Pump P2 Hydraulic Pump P3 Hydraulic Pump (Second Hydraulic Pump) P4 Hydraulic pump (first hydraulic pump)

Claims

1. An earth drilling machine comprising a main body and an attachment attached to the main body for connecting a drilling tool, The attachment may be selected from a boom type attachment and a leader type attachment, the body has an attachment mounting portion including a common connection portion for selectively mounting the boom-type attachment and the leader-type attachment; The boom type attachment and the leader type attachment each have an attachment body and a subframe that supports the attachment body and is attached to the attachment mounting portion, The attachment mounting portion is The subframe of the boom-type attachment and the subframe of the leader-type attachment are selectively attached using the connecting portion, The subframe of the boom-type attachment and the subframe of the leader-type attachment each have a common attachment mounting portion that is attached to the connecting portion of the attachment mounting portion by a common connecting member, The attachment receiving portion of the boom-type attachment and the attachment receiving portion of the leader-type attachment can be connected to the attachment mounting portion of the main body by the common connecting member, The boom-type attachment and the leader-type attachment each have a plurality of actuators that change the posture of the attachment; At least a portion of the plurality of actuators of each of the boom-type attachment and the leader-type attachment are mounted to the respective sub-frames.

2. The earth drill machine according to claim 1, The earth drill machine, wherein the connecting member is a connecting pin.

3. The earth drill according to claim 1 or 2, The earth drill machine is characterized in that the boom-type attachment and the leader-type attachment can perform corresponding excavation operations using the same operating device.

4. The earth drill machine according to claim 3, each of the boom type attachment and the leader type attachment includes a kelly bar connected to the excavation tool, a drive device that rotationally drives the kelly bar, and a thruster cylinder that raises and lowers the drive device; supplying pressure oil to the thruster cylinder by a first hydraulic pump when the boom-type attachment is attached; supplying pressure oil to the thruster cylinder by a second hydraulic pump when the leader type attachment is attached; An earth drill machine characterized in that the thruster cylinder can be operated by the same operating device.

5. The earth drill machine according to claim 3, The earth drill machine is characterized in that the boom type attachment and the leader type attachment can each be operated for auxiliary crane operation by the same operating device.

6. The earth drill machine according to claim 3, An earth drill machine, characterized in that the boom-type attachment and the leader-type attachment can be operated for raising and lowering operations by the same operating device.

7. In the earth drill machine according to any one of claims 1 to 6, an identification means for identifying which of the boom-type attachment and the reader-type attachment is attached to the main body; the identification means identifies which of the attachments is attached to the main body based on the presence or absence of an input signal related to the attachment; An earth drill machine, characterized in that a control program for the earth drill machine is switched based on the result of the identification by the identification means.

8. The earth drilling machine according to claim 1, The attachment body of the leader-type attachment has a leader that is displaceable between an excavation posture in which the leader stands vertically with respect to the ground and a forward inclined posture that is inclined forward more than the excavation posture, and a first front frame that supports the leader so that the angle of the leader can be adjusted; The attachment body of the boom-type attachment has a boom that can be raised and lowered to a position tilted forward from the vertical direction, and a second front frame whose angle can be changed relative to the boom and the subframe and that supports the drilling tool, and the angle of the drilling tool can be adjusted by adjusting the angle of the second front frame.

9. A boom-type attachment for use with the earth drill machine according to claim 1, A boom-type attachment having the attachment body and the subframe that is attached using the connecting portion included in the attachment mounting portion of the earth drill machine.

10. A leader-type attachment for use with the earth drill machine according to claim 1, A leader-type attachment having the attachment body and the subframe that is attached using the connecting portion included in the attachment mounting portion of the earth drill machine.

11. A method for replacing an attachment used in the earth drill machine according to claim 1, comprising the steps of: a first step of releasing the connection between the attachment mounting portion and the connecting portion by removing the common connecting member, and removing the subframe, on which the attachment main body of the boom-type attachment or the leader-type attachment attached to the main body is supported, from the attachment mounting portion; a second step, after the first step, of attaching a new subframe on which the attachment body of the leader type attachment or the boom type attachment is supported, by connecting the subframe to the connecting portion of the attachment mounting portion using the common connecting member.

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