Work machine

Abstract

To provide a work machine that solves the problem in which: preparation is needed before its construction, such as mounting of a bracket to a motor C for fitting a rotation speed detector D and wiring of a signal cable F between the rotation speed detector D and a management device E since the conventional work machine has a structure with the rotation speed detector D provided at the top of the motor C.SOLUTION: In a work machine, a base machine 5 is provided with a leader 6 standing thereon, and a rotary driving part 7 elevatably fitted to the leader 6 is detachably fitted with the upper part of a rod 11 of an excavation device 10. A motor 2 for driving the excavation device 10 is provided to the rotary driving part 7, and power fed from a power source 15 is fed to the motor 2 via an inverter 20. A management device 25 for storing and managing an excavation state of the excavation device 10 is provided at a predetermined position other than the rotary driving part 7 of the base machine 5. The management device 25 connects the inverter 20 to a signal cable 30 via a converter 24 to acquire managing data of the inverter 20.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a working machine.

Background Art

[0002] Conventionally, it is known to attach a rotational speed detector D to a motor C of a drive unit B of an excavation device A that performs excavation work, and connect the rotational speed detector D to a management device E provided on the machine body by a signal cable F (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the known example, since the rotational speed detector D is provided above the motor C provided in the drive case of the drive unit B, preparation is required before construction, such as attaching a bracket for attaching the rotational speed detector D to the motor C and wiring the signal cable F between the rotational speed detector D and the management device E. In addition, during construction, the rising signal cable F may be cut due to the operation of the base machine or the wind. Also, when the motor is under inverter control, the noise of the inverter may affect the signal of the rotational speed detector, and it may not be possible to obtain the rotational signal of the motor as accurate management data. As another method, there is a method of connecting the inverter and the management device with a communication cable and acquiring the data of the inverter, but it takes time to set the communication program each time. The present invention smooths the drive by inverter control of the motor, accurately and easily detects management data (rotational speed), and facilitates the management of the working machine.

Means for Solving the Problems

[0005] In the invention of claim 1, a leader 6 is provided which stands on the base machine 5, and in a working machine in which the upper part of the rod 11 of the excavation device 10 is detachably attached to a rotary drive unit 7 which is attached to the leader 6 so as to be movable up and down, a motor 2 for driving the excavation device 10 is provided in the rotary drive unit 7. The motor 2 supplies the electric power supplied from the power source 15 via an inverter 20, and a management device 25 for storing and managing the excavation state of the excavation device 10 is provided at a predetermined position other than the rotary drive unit 7 of the base machine 5. The management device 25 is connected to a signal cable 30 with an inverter 20 and a converter 24 interposed therebetween Frequency performance values from the inverter 20 to obtain management data of. In the invention of claim 2, the power source 15 is constituted by a generator 13 mounted on the base machine 5, and the inverter 20 is provided in a control panel 36 installed near the generator 13.

Advantages of the Invention

[0006] In the invention of claim 1, the electric power supplied from the power source 15 is supplied to the motor 2 via the inverter 20, and a management device 25 for storing and managing the excavation state of the excavation device 10 is provided at a predetermined position other than the rotary drive unit 7 of the base machine 5. When attempting to obtain data on the rotational speed, the signal of the tachometer attached to the operation panel of the excavation device is taken into the management device by a converter. Therefore, it is not necessary to attach a rotational speed detector to the main body of the rotary drive unit 7, and the configuration of the rotary drive unit 7 can be made simple and lightweight. Also, wiring such as a rising signal cable between the conventional rotary drive unit and the management device is not required. In this regard as well, the configuration around the rotary drive unit 7 of the base machine 5 can be made simple and lightweight. Further, the management data (rotational speed) stored and managed by the management device 25 is not affected by noise from the inverter 20, and the detection accuracy as management data (rotational speed) can be improved. Also, since the management device 25 is configured to obtain the management data (rotational speed) of the inverter 20 by connecting a signal cable 30 with an inverter 20 and a converter 24 interposed therebetween, even a management device manufacturer that does not manufacture augers can easily obtain the management data (rotational speed). In the invention of claim 2, the power supply 15 is constituted by the generator 13 mounted on the base machine 5, the inverter 20 is provided in the control panel 36 installed near the generator 13, and the inverter 20 and the management device 25 are connected by the signal cable 30 with the converter 24 interposed therebetween. Therefore, the wiring between the inverter 20 and the management device 25 becomes easy, the management device 25 can be connected to the inverter 20 of the control panel 36 of the existing base machine 5, and it is possible for a management device manufacturer that does not manufacture the rotary drive unit 7 or for so-called retrofitting. Not only can the versatility be improved, but also the rotation signal of the motor 2 can be detected from the inverter 20 to the management device 25 even during construction.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiment for Carrying Out the Invention

[0008] The present invention relates to the management of the motor 2 of a work machine (civil engineering work machine) 1, and the configuration of the work machine is arbitrary as long as it is driven by the motor 2. It is constituted by an excavation work machine, a soil improvement work machine, etc., and an embodiment thereof will be described with reference to the drawings using the example of the excavation work machine 1. For easy understanding, the directions such as front, rear, left, and right will be given in the description, but thereby, the configuration of the present invention is not limited. 5 is a base machine, 6 is a leader provided on the base machine 5, 7 is a rotary drive unit (earth auger) that is attached to the leader 6 so as to be able to move up and down, and the upper part of the rotary shaft body 8 is attached to the rotary drive unit 7 (FIG. 1). The leader 6 is for supporting the rotary drive unit 7, and the leader 6 is configured to be able to undulate from a state perpendicular to the ground to a horizontal state and to rotate together with the base machine 5.

[0009] At the lower part of the rotary shaft body 8 of the rotary drive unit 7, the upper part of the rod 11 of the excavation device 10 may be detachably attached, and an excavation head 12 may be provided at the lower part of the rod 11, and its configuration is arbitrary. That is, the excavation device 10 may be a so-called multi-shaft excavation device 10 in which a plurality of excavation heads 12 are arranged side by side, or may be an excavation and agitation device that performs soil improvement instead of the excavation device 10. For easy understanding, an example in which a single motor 2 for driving the excavation head 12 is built into the rotary drive unit 7 will be described below, but a plurality of motors 2 may be arranged side by side. The motor 2 uses the generator 13 mounted at a predetermined position of the base machine 5 as a power source 15 and is driven by the power supplied from the power source 15. However, the AC power from the power source 15 is converted into DC power by the inverter 20, and then reconverted into AC power and supplied to the motor 2 to drive it for excavation work.

[0010] And the management data (rotation speed) of the excavation state of the excavation device 10 is stored and held by the management device 25 and used for verification of subsequent excavation work and the like. The management device 25 stores and holds the performance numerical value of the frequency from the inverter 20, which is converted into data that can be stored and held by the management device 25 by the converter 24. Therefore, even for an existing rotary drive unit 7 or a management device manufacturer that does not manufacture the rotary drive unit 7, by attaching the converter 24 to the inverter 20, the rotation signal of the inverter 20 can be easily obtained, stored and held in the management device 25, and also, even during construction, the rotation signal can be transmitted from the inverter 20 to the management device 25. The management device 25 is configured to include at least a storage unit 26 that stores management data and a storage medium insertion port 28 that allows the management data (rotation speed) in the storage unit 26 to be taken out to a storage medium 27 such as a so-called USB memory. The storage medium insertion port 28 is provided inside the door member 28A of the management device 25 (Fig. 3).

[0011] 29 is a management device display monitor that displays management data (performance numerical value). Then, the management device 25 is connected by a signal cable 30 with the inverter 20 interposed via the converter 24. Conventionally, the management device and a rotation speed detector for detecting the rotation speed of the motor of the rotation drive unit were connected by a rising signal cable, and a power cable for supplying power to the motor was bundled and wired to this rising signal cable. Therefore, the noise of the inverter had an adverse effect on the rising signal cable that transmits the data of the rotation speed detector, reducing the detection accuracy of the rotation speed. However, in the present invention, the management device 25 is connected by the signal cable 30 with the inverter 20 interposed via the converter 24, and the inverter 20 and the motor 2 are connected only by the power cable 31. The installation of the conventional rotation speed detector can be omitted, and since the performance numerical values are directly transmitted from the inverter 20 to the management device 25, the management accuracy of the management device 25 can be improved without being affected by the noise of the inverter 20.

[0012] Specifically, the power supply 15 and the inverter 20 are connected, parameters for initial settings for driving the motor 2 of the rotation drive unit 7 are input to the inverter 20, and the inverter 20 converts AC power into DC power and then reconverts it into AC power along the parameters and supplies it to the motor 2. Also, the management device 25 is connected via the power supply 15 and the power cable 31, and operates with the power from the power supply 15 (FIG. 4). Also, when a position detection device 34 for a wire 33 for raising and lowering the rotation drive unit 7 is connected to the management device 25 by the signal cable 30 (not shown), the working depth of the excavation head 12 of the excavation device 10 detected by the position detection device 34 can be managed. Also, when a clock mechanism 35 is incorporated in the management device 25 (FIG. 3), the working time can be managed. The inverter 20 may be provided at an arbitrary predetermined position of the base machine 5. In this embodiment, a control panel 36 is provided near the operation unit 37 of the base machine 5, and the inverter 20 is provided in the control panel 36 (FIG. 1).

[0013] Therefore, since the inverter 20 is provided in the control panel 36 incorporating a control mechanism for controlling each part of the other excavation device 10, wiring and the like become easy, and maintenance can also be easily performed. 40 is an operation unit provided within the control unit 37. The configuration of the operation unit 40 is arbitrary. 42 is a power switch, 43 is a forward rotation switch for rotating the excavation head 12 forward, 44 is a reverse rotation switch for rotating the excavation head 12 in reverse, 45 is a stop switch for stopping the driving rotation of the excavation head 12, 46 is a rotation speed adjustment dial for adjusting the rotation speed of the excavation head 12, and 47 is a tachometer / frequency meter for displaying the rotation speed of the excavation head 12.

[0014] (Operation of the Embodiment) The present invention has the above configuration. When the base machine 5 is installed at the construction site and the operating conditions of the motor 2 and the like are input at the operation unit 40 of the control unit 37 to start the work, the AC power supplied from the power source 15 is converted into DC power under the set conditions, and this DC power under the set conditions is reconverted into AC power and output to the motor 2 of the rotation drive unit 7 to drive the excavation device 10 to perform excavation work. At the same time, the management device 25 is energized from the power source 15 via the power cable 31, whereby the management device 25 starts operating.

[0015] A signal cable 30 with an inverter 20 and a converter 24 interposed therebetween is connected to the management device 25, and the management device 25 manages and stores the performance values of the rotation speed of the motor 2 during excavation work. Therefore, only the motor 2, a speed reducer (not shown), etc. need to be provided in the rotation drive unit 7, and the configuration of the rotation drive unit 7 can be made simple and lightweight. Also, since wiring of the rising signal cable between the rotation drive unit 7 and the management device 25 becomes unnecessary, in this regard as well, the configuration around the rotation drive unit 7 of the base machine 5 can be made simple and lightweight, and there is no worry about cutting the rising signal cable.

Explanation of Reference Numerals

[0016] 1... Working machine, 2... Motor, 5... Base machine, 6... Leader, 7... Rotation drive unit, 10... Excavation device, 11... Rod, 12... Excavation head, 13... Generator, 15... Power supply, 20... Inverter, 24... Converter, 25... Management device, 26... Memory unit, 27... Memory medium, 28... Memory medium insertion port, 29... Display unit, 30... Signal cable, 31... Power cable, 33... Wire, 34... Position detection device, 35... Clock mechanism, 36... Control panel, 37... Control section, 40... Operation section, 42... Power switch, 43... Forward rotation switch, 44... Reverse rotation switch, 45... Stop switch, 46... Rotation speed adjustment dial, 47... Rotation speed meter / Frequency meter, A... Excavation device, B... Drive unit, C... Motor, D... Rotation speed detector, E... Management device, F... Signal cable.

Claims

1. In a working machine in which a leader 6 standing on a base machine 5 is provided, and an upper part of a rod 11 of an excavation device 10 is detachably attached to a rotation drive unit 7 that is attached to the leader 6 so as to be movable up and down, the rotation drive unit 7 is provided with a motor 2 that drives the excavation device 10. The motor 2 supplies electric power supplied from a power source 15 via an inverter 20. A management device 25 that stores and manages the excavation state of the excavation device 10 is provided at a predetermined position other than the rotation drive unit 7 of the base machine 5. The management device 25 is configured to connect a signal cable 30 with an inverter 20 interposed therebetween and a converter 24 to acquire management data of performance numerical values of a frequency from the inverter 20.

2. The working machine according to claim 1, wherein the power source 15 is constituted by a generator 13 mounted on the base machine 5, and the inverter 20 is provided in a control panel 36 installed in the vicinity of the generator 13.

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