JP2001012275A - Construction machine with feeding function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine capable of using a hydraulic shovel under an environment not ensuring the working space for installing both of the hydraulic shovel and an engine generator, and ensuring a power source to a lighting system, tools and the like by comprising an output terminal for taking-out the power of the power generator to the external of the construction machine. SOLUTION: The power generated by a power generator 2 connected to an output shaft of an engine 1 is rectified and waveform-shaped by a controller 3, converted into the voltage output from an ordinary engine generator such as a sine wave of AC100 V/200 V (50/60 Hz), and taken out from an output terminal 4 connected to an output side of the controller 3. As the other output of the controller 3 is connected to a motor 5, a hydraulic pump 6 is rotated, the flow and the direction of the pressure oil discharged from the hydraulic pump 6 are controlled by a control valve 7, and the pressure oil is fed to an actuator 8. The power generated from the generator can be taken out to the external of a construction machine through the output terminal, and the taken- out power can be fed to, for example, a lighting system, tools and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a construction machine such as a shovel, and more particularly to a construction machine having a power supply function.

[0002]

2. Description of the Related Art Conventionally, a construction machine such as a hydraulic shovel and an engine generator are often used as a set at a construction site in construction and civil engineering work. Hydraulic excavators are used for excavation work, loading or leveling work, and the like. An engine generator supplies power to a tool such as a night lighting device or an electric drill at a work site where power cannot be secured.

[0003]

However, when the working space is limited, for example, in excavation work on a road shoulder, it is not possible to secure a space for installing both the excavator and the engine generator. Sometimes.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems in conventional construction machines, and is intended to be used in an environment where a work space for installing both a hydraulic shovel and an engine generator cannot be secured. It is intended to provide a construction machine with a power supply function capable of securing a power supply to a lighting device and tools and the like.

[0005]

According to a first aspect of the present invention, there is provided a construction machine having an engine and a generator driven by the engine, comprising an output terminal for extracting electric power generated by the generator to outside the construction machine. This is a construction machine with a power supply function.

According to a second aspect of the present invention, there is provided a construction machine having a power feeding function, wherein the construction machine has an upper swing body and the output terminal is provided at a rear portion thereof.

According to a third aspect of the present invention, there is provided a construction machine having a power supply function, wherein the construction machine has an upper swing body and the lower frame has the output terminal.

According to a fourth aspect of the present invention, there is provided a construction machine with a power supply function provided with an operation stopping means capable of disabling a specific operation of the construction machine when power is taken out from an output terminal.

According to a fifth aspect of the present invention, there is provided a construction machine having a power supply function in which the specific operation is one or both of a turning operation and a traveling operation.

According to a sixth aspect of the present invention, there is provided a construction machine having a power supply function provided with an adjusting means for adjusting an engine speed near an output terminal.

According to a seventh aspect of the present invention, there is provided a current detecting means for detecting a current value output from an output terminal, and an engine speed control for controlling an engine speed in accordance with the current value detected by the current detecting means. A construction machine with a power supply function according to any one of claims 2 to 6, further comprising means.

According to the present invention, the power consumed externally through the output terminal is calculated based on the hydraulic pump and the current value detected by the current detecting means, and the horsepower corresponding to the power is calculated from the engine output horsepower. And a horsepower control means for driving a hydraulic pump with the subtracted engine output horsepower.

According to the first aspect of the present invention, since the power generated by driving the generator can be taken out of the construction machine through the output terminal, the taken power is supplied to, for example, a lighting device and tools. be able to.

According to the second aspect of the present invention, since the output terminal is provided at the rear portion of the upper revolving structure, a cord of a lighting device, a tool or the like can be easily connected.

According to the third aspect of the present invention, since the lower frame is provided with the output terminal, the upper revolving unit can be swung in a state in which a cord such as a lighting device or a tool is connected.

According to the present invention, when power is taken out from the output terminal, a specific operation can be disabled from outside the construction machine, so that the cord can be safely connected or disconnected. .

According to the fifth aspect of the present invention, when a cord such as a lighting device or a tool is connected to the output terminal of the upper rotating body, the turning operation and the traveling operation can be disabled. Further, when a cord such as a lighting device or a tool is connected to the output terminal of the lower frame, the turning operation can be disabled.

According to the sixth aspect of the present invention, the engine speed can be adjusted by the adjusting means provided in the vicinity of the output terminal. The engine speed can be increased.

According to the present invention, since the engine speed is controlled in accordance with the current value output from the output terminal, the engine speed is automatically adjusted according to the load connected to the output terminal. can do.

According to the present invention, since the hydraulic pump is driven by the engine output horsepower obtained by subtracting the horsepower corresponding to the power consumed externally through the output terminal, the hydraulic excavator supplies power from the output terminal. Can be operated stably.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 shows the basic configuration of a construction machine with a power supply function according to the present invention.

In FIG. 1, reference numeral 1 denotes an engine, and reference numeral 2 denotes a generator connected to an output shaft of the engine 1. The electric power generated by the generator 2 is rectified and waveform-shaped by the controller 3, and for example, AC100V / 200V (50 / 60H)
The voltage is converted into a voltage output from a normal engine generator like a sine wave of z), and can be taken out from an output terminal 4 connected to the output side of the controller 3.

Another output of the controller 3 is connected to an electric motor 5, which rotates a hydraulic pump 6, and controls the flow and direction of hydraulic oil discharged from the hydraulic pump 6 by a control valve 7. It controls and supplies the controlled pressure oil to the actuator 8. Note that a battery 9 is connected to yet another output of the controller 3 so that the surplus power generated by the generator 2 is stored.

FIG. 2 shows the appearance of a hydraulic shovel equipped with the circuit shown in FIG. In the figure, reference numeral 10 denotes a lower traveling body, and an upper revolving body 11 is mounted on the lower traveling body 10 to be freely rotatable. Reference numeral 12 denotes an excavation attachment attached to a front portion of the upper revolving unit 11,
The excavation attachment 12 includes a boom 12a and a boom cylinder 12b, an arm 12c and an arm cylinder 12d, a bucket 12e and a bucket cylinder 12f.
And

The lower traveling body 10 has left and right crawler frames 13a and 13b (only the near side is shown) and crawlers 13c and 13d on a lower frame 13, and left and right traveling motors 14a and 14c disposed on both side crawlers 13c and 13d.
The excavator is caused to travel by the drive of 14b.

On the other hand, the swing frame 14 of the upper swing body 11
The engine 1, the generator 2, the electric motor 5, the hydraulic pump 6, the control valve 7, the battery 9 and the like are provided on the upper side, and are configured to be able to turn by driving a turning motor (not shown). In addition, 15 is a cabin.

The output terminal 4 is provided below the rear part of the upper revolving unit 11, and an operation stop switch (operation stop means) near the output terminal 4 for disabling the traveling operation and the turning operation of the hydraulic shovel. 16 are provided.

FIG. 3 shows the arrangement of the output terminal 4 and the operation stop switch 16 in an enlarged manner. In the figure, terminal 4a shows 200V AC, three-phase output, and terminal 4b
Shows 100V output. The operation stop switch 16 is disposed on the right side near the output terminal 4, and is configured by a snap switch.

FIG. 4 shows the configuration of an operation stop control circuit which is operated by operating the operation stop switch 16.

In the figure, pressure oil discharged from a variable displacement first hydraulic pump 6a is supplied to a turning motor 8a as an actuator via a turning control valve 7a.
This is performed by applying a pilot secondary pressure derived from the turning remote control valve 20a to one of the pilot ports 7b and 7c.

The hydraulic oil discharged from the variable displacement type second hydraulic pump 6b is also supplied to a right traveling motor 14a via a right traveling control valve 7d, and the switching operation of the right traveling control valve 7d is performed as follows. The control is performed by applying a pilot secondary pressure derived from the right remote control valves 20a, 20c to one of the pilot ports 7e and 7f. Note that the operation content of the left traveling remote control valve 20c is the same as that of the right traveling remote control valve 20b, and a description thereof will be omitted.

Oil passages 22a and 22b connecting the remote control valves 20a to 20c and the pilot pump 21
Are provided with cut valves 23a and 23b, respectively.

These cut valves 23a and 23b are constituted by electromagnetic switching valves, and when the operation stop switch 16 is manually closed, the signals S ₁ and S ₂ respectively output the cut valves 23a and 23b.
a and 23b, and the oil passages 22a and 22b are both shut off. As a result, the turning motor 8a, the right traveling motor 14a, and the left traveling motor 14b are not driven by operating any of the operation levers of the remote control valves 20 to 20c.

When the upper revolving unit 11 is turned while the output terminal 4 is connected to a cord such as a lighting device or a tool, the cord connected to the output terminal 4 is cut off, or a lighting fixture or a cord is connected via the cord. The tool will be pulled and damaged. However, according to the operation stop control circuit shown in FIG. 4, both the turning operation and the traveling operation are disabled, so that the above-described trouble can be prevented.

FIGS. 5A and 5B show a configuration in which the output terminal 4 is attached to the lower frame 13. FIG. In the configuration shown in the figure, an output terminal 4 and an operation stop switch 16 are provided at a substantially central portion at the rear of the lower frame 13.

According to this configuration, the output terminal 4 is not provided on the upper swing body 11 which is a movable part,
Troubles such as disconnection of the cord connected to the computer do not occur. However, in this case, when power is supplied from the generator 2 installed on the upper revolving unit 11 to the output terminal 4 provided on the lower traveling unit 10, it is necessary to provide a sliding contact such as a slip ring. In this case, the operation stop switch 16 only needs to disable the traveling operation. That is, a turning operation can be performed on the upper turning body 11.

FIG. 6 shows that an accelerator trimmer (hereinafter referred to as an output terminal accelerator trimmer) 31 is provided in the vicinity of the output terminal 4 as adjusting means having the same configuration as the driver's seat accelerator trimmer 30 normally provided in the driver's seat. The engine speed is increased or decreased from outside the hydraulic excavator without having to be in the driver's seat.

A driver's seat accelerator trimmer 30, an output terminal accelerator trimmer 31, and an operation stop switch 16 are connected to the input side of the accelerator controller 32, and an accelerator motor 33 is connected to the output side.

Dial type driver's seat accelerator trimmer 30
Is provided at the rear of the operation panel 36a of the operation box 36 arranged on the side of the seat 35 as shown in FIG. 7 (a), and controls an arbitrary and constant engine speed from "Low" to "High". It can be set.

On the other hand, the output terminal accelerator trimmer 31 is provided near the output terminal 4 provided on the upper revolving unit 11 or the lower frame 13 as shown in FIG. 7B.

Next, the control operation of the accelerator controller 32 of FIG. 6 will be described with reference to the flowchart of FIG.

When the operation stop switch 16 is turned on (step S1), the accelerator motor 33 can be controlled by the output terminal accelerator trimmer 31 (step S1).
2) The adjustment of the engine speed from the driver's seat side is not allowed. On the other hand, when the operation stop switch 16 is OFF, the driver's seat accelerator trimmer 30 can be controlled (step S3), and adjustment of the engine speed from outside the hydraulic excavator is disabled. Therefore, the engine speed can be controlled both from the driver's seat side and from the outside of the hydraulic excavator. However, since it is linked with the operation of the operation stop switch 16, either the driver's seat accelerator trimmer 30 or the output terminal accelerator trimmer 31 can be controlled. One of the controls will be switched manually.

According to this control, when the load on, for example, the tool connected to the output terminal 4 increases, the output terminal accelerator trimmer 31 is switched from "Low" to "High" to increase the engine speed, Thereby, the voltage shortage can be eliminated.

In the control shown in FIG. 8, a method of switching the control of the driver's seat accelerator trimmer 30 and the output terminal accelerator trimmer 31 by manually turning on and off the operation stop switch 16 has been described. Alternatively, the control of the driver's seat accelerator trimmer 30 and the output terminal accelerator trimmer 31 can be automatically switched by selecting a higher order between the command from the driver's seat accelerator trimmer 30 and the command from the output terminal accelerator trimmer 31.

FIG. 9 shows a control circuit for monitoring the current value supplied from the output terminal 4 and automatically adjusting the engine speed according to the current value. In the following drawings, the same components as those in FIGS. 1 and 6 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 9, a current detector (current detecting means) 40 is interposed between the controller 3 and the output terminal 4, and the detected value of the current detector 40 is used as an accelerator controller (engine speed controlling means). ) 41.

The input side of the accelerator controller 41 is connected to a rotation sensor 42 for detecting the engine speed, the driver's seat accelerator trimmer 30 and the operation stop switch 16, and the output side is connected to an accelerator motor 33. ing.

Next, the control operation of the accelerator controller 41 will be described with reference to the flowchart of FIG.

In the figure, the operation stop switch 16 is set to O
N (Step S4), a current value flowing to a load such as a tool connected to the output terminal 4 is detected by the current detector 40 (Step S5), and an engine speed corresponding to the detected current value is determined. It is read from the current-engine speed map and determined (step S6). Then, by controlling the accelerator motor 33 with the determined engine speed, it is possible to adjust the engine speed to match the load.

FIG. 11 shows the current-engine speed map. In the figure, the horizontal axis represents the current, and the vertical axis represents the engine speed. The engine speed is increased stepwise in proportion to the increase in the current. The reason why the engine speed is not increased linearly but in a stepped manner is as follows. That is, for example, the output terminal 4
When tools are connected to the power supply, the current value fluctuates due to a change in the load of the tools. If the engine speed is changed each time the current value fluctuates, the rotation of the engine will not be stable and the fuel consumption will deteriorate. Therefore, the current-engine speed characteristic T when the current value increases is represented by the current value I
Larger amount increases N ₁ minute engine speed regardless of the increase or decrease of the current value is _1. For example, low engine speed:
800rpm~High: When you change up to 2400rpm, increase N ₁ is
400 rpm.

In the range of the current value I ₂ , 2N ₁ is set as the engine speed. Therefore it is possible to a constant engine speed relative to current fluctuation (see figure N ₂ and N _3). On the other hand, the current-engine speed characteristic when the engine speed decreases is set so as not to return on the characteristic T but to fall in a step-like manner with a hysteresis. The reason why the hysteresis is provided is to prevent the engine speed from frequently changing with the current fluctuation.

When the operation stop switch 16 is turned off in step S4, the accelerator motor is controlled by the driver's seat accelerator trimmer 30 as in the conventional operation (step S8).

Next, FIG. 12 shows a configuration in which the hydraulic excavator can be stably operated while supplying power from the output terminal 4.

Referring to FIG. 5, an example of a work in which a lighting device 50 such as a floodlight is connected to the output terminal 4 to perform a leveling operation at night will be described. The current value detected by the current detector 40 is supplied to a horsepower controller (horsepower control means) 51, and the horsepower controller 51 controls the tilt angle of a variable displacement type hydraulic pump 6a, for example.

FIG. 13 is a flowchart showing the control operation of the horsepower controller 51. In FIG.
0 detects the external output current I ₀ taken out of the excavator through the output terminal 4 and supplied to the lighting device 50 (step S9), and the horsepower controller 51 receiving the detected external output current I ₀ calculating the external output power W ₀ to be consumed by the hydraulic excavator outside (step S10).

External output power W ₀ = V ₀ × I ₀ (1) where V _{0 is} an external output voltage and I _{0 is} an external output current.

Next, the horsepower W _H absorbed by the first hydraulic pump 6a is calculated. That is, the horsepower corresponding to the power consumed outside is subtracted from the engine output horsepower of the excavator in advance (step S11).

[0059] Here absorbing horsepower _{W H = W E -W 0 ......} (2), W E: engine output horsepower, W _0: External output horsepower (power) then displaces the tilt angle of the first hydraulic pump 6a , Equation (2)
Performing pump horsepower control by suction horsepower W _H obtained by.

The construction machine according to the present invention is not limited to the above-mentioned hydraulic excavator, but can be applied to construction machines such as cranes.

[0061]

As is apparent from the above description,
According to the first aspect of the present invention, since the power generated by driving the generator can be taken out of the construction machine through the output terminal, the taken out power can be supplied to, for example, lighting devices and tools. .

According to the second aspect of the present invention, since the output terminal is provided at the rear portion of the upper revolving structure, it is possible to easily connect a cord such as a lighting device or a tool.

According to the third aspect of the present invention, since the lower frame is provided with the output terminal, the upper revolving unit can be swung while the cords of the lighting device and the tools are connected.

According to the fourth aspect of the present invention, since a specific operation can be disabled from outside the construction machine, the cord can be connected or disconnected safely.

According to the fifth aspect of the present invention, when a cord such as a lighting device or a tool is connected to the output terminal of the upper rotating body, the turning operation and the traveling operation can be disabled. Further, when a cord such as a lighting device or a tool is connected to the output terminal of the lower frame, the turning operation can be disabled.

According to the present invention, when the load connected to the output terminal is large, the engine speed can be increased from outside the construction machine.

According to the present invention, the engine speed can be automatically adjusted according to the load connected to the output terminal.

According to the present invention, the hydraulic shovel can be operated stably while supplying power from the output terminal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a main part of a construction machine with a power supply function according to the present invention.

FIG. 2 is a front view showing the entire configuration of the construction machine with a power supply function of the present invention.

FIG. 3 is an enlarged view showing an arrangement of output terminals shown in FIG. 2;

FIG. 4 is an operation stop control circuit diagram according to the present invention.

FIG. 5A is a perspective view of a lower traveling body according to the present invention,
(B) is a plan view.

FIG. 6 is a block diagram showing a configuration of an adjusting unit according to the present invention.

FIG. 7A is a perspective view showing an arrangement of a driver's seat accelerator trimmer according to the present invention, and FIG. 7B is an enlarged view showing an arrangement of an output terminal accelerator trimmer.

FIG. 8 is a flowchart showing a control operation of the accelerator controller of FIG. 6;

FIG. 9 is a block diagram illustrating a configuration of an engine speed control unit according to the present invention.

FIG. 10 is a flowchart showing a control operation of the accelerator controller of FIG. 9;

FIG. 11 is a graph showing a current-engine speed map relating to the accelerator controller.

FIG. 12 is a block diagram showing a configuration of a horsepower control unit according to the present invention.

13 is a flowchart showing a control operation of the horsepower controller of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Generator 3 Controller 4 Output terminal 5 Electric motor 6 Hydraulic pump 7 Control valve 8 Actuator 9 Battery 10 Lower traveling body 11 Upper revolving body 12 Excavation attachment 13 Lower frame 16 Operation stop switch 30 Driver accelerator trimmer 31 Output terminal accelerator Trimmer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F15B 11/00 F15B 11/00 Z (72) Inventor Masayuki Komiyama 3-12-4 Gion, Asaminami-ku, Hiroshima-shi No.F-term in Yutani Heavy Industries, Ltd. (reference)

Claims (8)

[Claims] 1. A construction machine having an engine and a generator driven by the engine, comprising: an output terminal for extracting electric power generated by the generator to the outside of the construction machine. machine. 2. The construction machine with a power supply function according to claim 1, wherein the construction machine has an upper swing body, and the output terminal is provided at a rear portion thereof. 3. The construction machine with a power supply function according to claim 1, wherein the construction machine has an upper swing body, and the lower frame is provided with the output terminal. 4. When extracting electric power from the output terminal,
The construction machine with a power supply function according to claim 2 or 3, further comprising an operation stopping unit configured to disable a specific operation of the construction machine. 5. The construction machine with a power supply function according to claim 3, wherein the specific operation is one or both of a turning operation and a traveling operation. 6. The construction machine with a power supply function according to claim 2, further comprising an adjustment means for adjusting an engine speed near said output terminal. 7. An electric motor comprising: a current detecting means for detecting a current value output from the output terminal; and an engine speed controlling means for controlling an engine speed in accordance with the current value detected by the current detecting means. A construction machine with a power supply function according to any one of claims 2 to 6. 8. An electric power consumed externally through the output terminal based on a hydraulic pump and a current value detected by the current detecting means, and a horsepower corresponding to the electric power is subtracted from an engine output horsepower, and the subtraction is performed. The construction machine with a power supply function according to claim 7, further comprising: horsepower control means for driving the hydraulic pump with the engine output horsepower.