JP2012000036A - Electric tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric tiller which accurately display the residual quantity of the electric capacity of a battery and whose display surface can easily be sawn.SOLUTION: The small electric tiller equipped with an electric motor 8 for driving a rotary portion R for tilling a field and a battery 48 which is an electric source of the motor 8 is characterized by disposing a display area capable of distinguishably displaying a state that a battery residual capacity is sufficient for driving the motor 8 and a state that the battery residual capacity is insufficient for driving the motor 8, in a battery residual capacity monitor 26c for displaying the residual quantity of the electric capacity of the battery 48, and disposing a controller 100 for more increasing a threshold than a preliminarily set value, when a battery residual capacity equal to or lower than the preliminarily set threshold is detected.

Description

  The present invention relates to an electric field cultivator that can easily perform a field work.

  A conventional electric field cultivator is equipped with a drive motor that is a power source for rotationally driving a cultivating claw, and a push-type mini electric field cultivator provided with an indicator for displaying the remaining amount of electric capacity of the battery of the drive motor is known. ing.

JP 2009-34000 A

  In the electric field cultivator described in Patent Document 1, the voltage value is likely to fluctuate due to vibration or restart during farming. If the threshold value is temporarily detected, the display indicating that the remaining amount of electric capacity of the battery is low is temporarily displayed, which may be difficult for the operator to understand.

  Accordingly, an object of the present invention is to provide an electric field cultivator that accurately displays the remaining amount of electric capacity of a battery and makes the display surface easy to see.

The above-mentioned problem of the present invention is solved by the following means.
That is, the invention described in claim 1 is a rotary unit (R) for plowing a field, a motor (8) for driving the rotary unit (R), and a transmission for transmitting the power of the motor (8) to the rotary unit (R). A shaft (41), a transmission frame (2) that houses the transmission shaft (41), a body frame (1) that is fixed to the upper part of the transmission frame (2), and a motor mounted on the body frame (1) ( 8) In the electric field cultivator provided with the battery (48) as the power source, a battery remaining amount display unit (26c) for displaying the remaining amount of electric capacity of the battery (48) is provided on the body frame (1). The battery remaining amount display section (26c) is provided with a display area capable of distinguishing and displaying a state where the remaining amount of the battery is sufficient for driving the motor (8) and a state where the remaining amount of the battery (8) is not sufficient for driving the motor (8). The battery remaining amount is set in advance An electric cultivator, characterized in that the threshold value when detecting a value below provided a control device (100) to raise from the preset value.

  According to the second aspect of the present invention, when the remaining amount of the battery is sufficient for driving the motor (8) before starting, the control device (100) elapses for a predetermined time from the starting time of the motor (8). Until then, the electric power tiller according to claim 1, wherein the display when the battery remaining amount is sufficient is continued in the remaining amount display section (26 c).

  According to the first aspect of the present invention, when the remaining battery level is relatively low, the control device (100) displays, for example, red when the remaining battery level is relatively small, and the remaining battery level is relatively low. When there are many, for example, green is displayed. In this way, when notifying the operator of the remaining capacity of the battery capacity with a two-color display, when the remaining capacity is low, for example when it is lit red, the voltage value is likely to fluctuate due to vibration or restart during farming Therefore, in order to temporarily raise the threshold value so that red lighting does not occur, the remaining amount determination is performed by raising the threshold value.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the control device (100) allows the control device (100) of the motor (8) until a predetermined time has elapsed since the start of the motor (8). When the remaining battery level is sufficient to drive the motor (8) before the start-up, the battery remaining level display (26c) is continuously displayed on the battery level display unit (26c). The influence on the display of the battery remaining amount display part (26c) due to the voltage drop at the time of activation of 8) can be prevented.

It is a left view of the electric field cultivator of an embodiment of the invention. It is a rear view of the electric field cultivator of FIG. It is a top view of the electric power tiller of FIG. It is a left view of the electric field cultivator of FIG. It is a left view of the state which folded the handle | steering-wheel of the electric field cultivator of FIG. It is a side view explaining operation of the handle | steering-wheel grip part of the electric power tiller of FIG. It is a bottom view explaining operation of the handle | steering-wheel grip part of FIG. It is the front view (FIG. 8 (a)) and side view (FIG. 8 (b)) of the battery case of the electric power tiller of FIG. FIG. 9 is a bottom view (FIG. 9A) and a side view (FIG. 9B) of the battery case of FIG. 8. It is a top view when the battery case of the electric power tiller of FIG. 1 is removed. It is a control block diagram of the electric power tiller of FIG. FIG. 2 is a system block diagram of a battery unit, a motor, and a monitor unit of a display unit such as an operation state and the charger of the electric power tiller of FIG. 1. It is a figure which shows the control circuit structure for the display of the battery remaining amount monitor of the electric power tiller of FIG. It is a front view (FIG.14 (a)) of the battery remaining amount monitor of the electric power tiller of FIG. 1, and a related figure (FIG.14 (b)) of the output of the display voltage of a battery voltage and a battery remaining amount monitor. It is a figure which shows the example in which the rising waveform with respect to elapsed time arrange | positions both the battery reference voltage of the electric power tiller of FIG. It is a figure which shows the flowchart of lighting control of the battery remaining amount monitor of the electric power tiller of FIG. It is a figure which shows the flowchart of lighting control of the battery remaining amount monitor of the electric power tiller of FIG. It is a figure which shows the flowchart of lighting control of the battery remaining amount monitor of the electric power tiller of FIG. It is a figure which shows the flowchart of lighting control of the battery remaining amount monitor of the electric power tiller of FIG. It is a figure which shows the flowchart of lighting control of the battery remaining amount monitor of the electric power tiller of FIG. It is a figure which shows the relationship between the voltage and electric current for lighting control of the battery remaining amount monitor of the electric power tiller of FIG. It is a figure which shows the flowchart of lighting control of the battery remaining amount monitor of the electric power tiller of FIG. It is a figure which shows the flowchart of lighting control of the battery remaining amount monitor of the electric power tiller of FIG. It is a figure which shows the flowchart of lighting control of the battery remaining amount monitor of the electric power tiller of FIG.

Embodiments of the electric power tiller of the present invention will be described below with reference to the drawings.
In this specification, the direction in which the operator with the manual handle of the cultivator advances the cultivator is referred to as the front, the opposite side is referred to as the rear, and the left and right directions are directed to the left and right, respectively. To do.

  A transmission frame 2 having a transmission shaft 41 (FIG. 4) is attached to the front of the machine body frame 1 having a longitudinal direction in the front-rear direction. And the rotary shaft 3 extended in the left-right direction which rotates around the horizontal axis by the transmission of the transmission shaft 41, a plurality of rotary claws 4 attached to the rotary shaft 3 as appropriate, and the side disk 5 attached to the left and right ends of the rotary shaft 3 The rotary part R which consists of is provided.

  A rotary cover 6 having a disk shape in plan view that covers the upper portion of the rotary part R is attached to the upper part of the body frame 1. A U-shaped wall portion 6a in a plan view is formed at the left and right central portions of the rotary cover 6, and an opening 6b is formed along the inside of the wall portion 6a. A motor cover 7 is attached to the front half of the opening 6b, a drive motor 8 for transmitting power to the transmission shaft 41 is mounted inside the motor cover 7, and a battery 48 is attached to the rear half of the opening 6b. The battery case 9 containing the battery is detachably attached. The drive motor 8 and the battery case 9 are mounted on a mounting table 10 (FIG. 4) attached to the body frame 1 and are disposed through the opening 6 b.

  A front end side of a handle frame 11 extending in the front-rear direction is connected to the rear portion of the body frame 1. The handle frame 11 is inclined so that the rear side faces upward, and left and right operation handles 12a and 12b are branched at the rear end portion of the handle frame 11, and the rear of the left and right operation handles 12a and 12b is provided. Handle grips 13a and 13b for gripping the operator are attached to the ends.

  Further, a support wheel 14 that supports the machine frame 1 when moving the electric tiller and a resistance bar 15 that prevents dashing of the machine during the tilling work are provided at the rear end of the machine frame 1 below the handle frame 11. It is attached.

Next, the driving configuration of the aircraft will be described.
As shown in the rear view of the fuselage in FIG. 2 and the plan view of the fuselage in FIG. 3, a power switch 16 for turning on and off the motor drive power is provided at a position where the operation handles 12a and 12b branch from the handle frame 11, and An operation lever 17 (FIGS. 1 and 6) for turning the motor 8 on and off is provided in the vicinity of the grip 13b. On the rear surface of the battery case 9, an output terminal 18 of a wiring 20 that connects the battery 48 in the battery case 9 and the drive motor 8 and a charging terminal 19 for charging the battery 48 are provided. The output terminal 18 and the charging terminal 19 are respectively provided on the left and right sides of the handle frame 11 when viewed from the rear of the machine body, so that the operator can easily attach and detach wiring from the rear side of the machine body on the operation side. . In addition, since the output terminal 18 and the charging terminal 19 are arranged on the left and right sides with the handle frame 11 in between when viewed from the rear of the machine body, they are arranged on the left and right sides, respectively, so that it is easy to understand visually and can prevent errors.

  The wiring 20 (FIGS. 1 and 3) for connecting the battery 48 and the motor 8 is between the lower part of the battery case 9 and the lower part of the inclined part 6c formed on the outer periphery of the wall part 6a of the rotary cover 6 and the mounting table 10 described later. It is configured to pass through space.

  The battery case 9 has a handle 9a formed on the upper surface, a plurality of position fixing feet 9b formed on the lower surface, and the position fixing feet 9b inserted into the position fixing holes 10a formed on the mounting table 10, The mounting position of the battery case 9 is fixed. Further, as shown in FIG. 10, the battery case 9 is supported by the wall 6a of the rotary cover 6 on the left and right side surfaces, and is formed with a long and narrow protruding portion 9c for fixing the position on the front surface. It is configured to be able to engage with a long and narrow concave portion 7 a for fixing the position formed in the cover 7. In addition, an opening 10b is provided at the center of the left and right of the mounting table 10 so that water that has flowed into the mounting table 10 with rainwater or the like can be temporarily stored in the opening 10b.

  Further, as shown in FIGS. 8 to 10, when the battery case 9 is set on the fuselage, the position-fixing protrusion 9c is inserted into the position-fixing recess 7a and is lowered as it is. Is inserted into the position fixing hole 10a and the position of the battery case 9 is fixed. When the battery case 9 is taken out, it can be taken out simply by pulling up the handle 9a.

The battery case 9 of the present embodiment is supported by the motor cover 7 on the front side and the wall portion 6a of the rotary cover 6 on the front side, but the wall portion 6a may be formed separately from the rotary cover 6. For example, it is good also as a structure which forms the wall part 6a attached to the mounting base 10 side. Further, by forming the wall portion 6a so as to be inclined upward, the support of the battery case 9 can be strengthened and the aesthetic appearance of the entire body can be improved. Further, a rear support wall 6d is formed on the back side of the battery case 9 to support the battery case 9 from the back side. The rear support wall 6d is formed lower than the wall 6a that supports the side surface of the battery case 9, and the output terminal 18 and the charging terminal 19 are exposed to the rear side of the fuselage so that the output terminal 18 and the charging terminal 19 are connected. It is easy to connect.

Next, the operation safety device T of the operation lever 17 will be described mainly with reference to FIGS.
The operation lever 17 is configured to rotate around a horizontal axis 30 provided on a cover member 29 having a reverse U-shaped cross section covering a part on the base side of the handle 12b. The switch operating portion 17a is formed on the rear side of the horizontal shaft 30 and the gripping portion 17b is formed on the rear side of the horizontal shaft 30. A spring 25 (FIG. 7) for returning the operating lever 17 to the initial position after the switch operating portion 17a is rotated downward by gripping the gripping portion 17b of the operating lever 17 includes a protrusion 30a integrated with the horizontal shaft 30 and a cover member. Connect to 29 appropriate locations.

  Further, a moving shaft 31 is provided at a position penetrating the wall surface of the cover member 29 located behind the horizontal shaft 30. The moving shaft 31 is supported in a direction (left-right direction) intersecting the gripping portion 17b, and is arranged on the wall surface of the cover member 29 so as to slide in the left-right direction. The moving shaft 31 is formed with a small diameter portion 31a and a large diameter portion 31b adjacent to each other in order from the inside of the machine body. And it is set as the structure which the large diameter part 31b is located on the rotation locus | trajectory of the holding part 17b in the initial position of the operation safety apparatus T (refer Fig.7 (a)). Further, a pushing portion 31c for pushing the moving shaft 31 toward the outside of the body is formed at the inner end of the moving shaft 31, and a spring is applied to the moving shaft 31 between the pushing portion 31c and the wall surface of the cover member 29. 35 is wound.

Further, a limit switch (operation switch) 33 for turning on / off the driving of the motor 8 is provided on the cover member 29. A limit switch 33 is provided at a position where the switch operating portion 17a is pressed when the switch operating portion 17a is rotated downward by gripping the gripping portion 17b of the operating lever 17.
Thus, the operation safety device T of the operating lever 17 includes the switch operating portion 17a, the gripping portion 17b, the spring 25, the cover member 29, the horizontal shaft 30, the moving shaft 31 having the small diameter portion 31a, the large diameter portion 31b, and the pushing portion 31c. The limit switch 33 and the spring 35 are provided.

The operation at the time of tillage work of the operation lever 17 and the safety device T in the above configuration will be described below.
When the power switch 16 is turned on and the pushing portion 31c is pushed with the thumb, the moving shaft 31 moves laterally toward the outside of the machine body, the large diameter part 31b moves to the outside of the machine body, and the small diameter part 31a turns the operation lever 17. It is located on the movement locus (see FIG. 7B). When the operator grips the gripping portion 17b, the switch operating portion 17a and the gripping portion 17b are rotated to a position where the limit switch 33 is turned on, and the motor 8 is driven to rotate the rotary portion R to perform the tilling work ( (Refer FIG.6 (b)). When the plowing work is started, the gripping portion 17b and the small diameter portion 31a are in contact with each other, and the operator releases the push portion 31c to stop the gripping portion 17b from returning to the initial position of the large diameter portion 31b. Tilling work can be continued with the portion 17b gripped.

  When stopping the tilling work, when the operator releases the gripping portion 17b, the switch operating portion 17a is rotated to the initial position by the action of the spring 25, the limit switch 33 is turned off, and the rotary portion R is stopped (FIG. 6C). )reference). Further, the moving shaft 31 moves to the inside of the machine body by the action of the spring 35 and returns to the initial position.

  Even when the operator carries the electric power tiller with the power switch 16 turned on, even if the operator suddenly abuts on the grip 17b of the operation lever 17 and the grip 17b rotates, the grip 17b is moved. In contact with the large diameter portion 31b of the switch 31, the switch operating portion 17a does not rotate to the position where the limit switch 33 is inserted, and the limit switch 33 is not turned on (see FIG. 6A). The rotary portion R does not rotate unless the gripping portion 17b is operated while the push portion 31c is pressed. Therefore, the rotary portion R unexpectedly moves when the operator is carrying the power switch 16 without knowing that the power switch 16 is on. It is safe because it does not rotate.

Next, the configuration of the LED display unit will be described below.
In the vicinity of the power switch 16, a plurality of LED display portions 26 (FIG. 3) showing various operation states are provided. In the present embodiment, a power on / off LED display unit 26a, an operation on / off LED display unit 26b, and a battery remaining amount LED display unit 26c are provided. In the LED display unit 26a that is turned on and off, the first color green is emitted when the power switch is turned on, and when the overload is detected and a protection circuit (not shown) provided in the wiring 20 is activated, the second color is obtained. Red light is emitted. When the limit switch 33 is turned on and the rotary portion R is driven in the on / off LED 26b, green is emitted as the first color, and the second circuit is activated when a protection circuit (not shown) by a temperature sensor built in the motor 8 is activated. The color red emits light. When the remaining amount of the battery 48 is normal, the LED indicator 26c for the remaining battery level emits green, which is the first color, and emits red, which is the second color, when the remaining amount is less than the set amount.

  In this way, various operation states are displayed on the LED display unit 26, and many operations can be displayed with a small number of LEDs by appropriately changing the color from the first color to the second color. By arranging the LED display unit 26 at a position that is easy to see from the operation side, it is easy to check various driving situations. Further, since the LED display unit 26 is provided adjacent to the power switch 16, the LED display unit 26 can be easily confirmed at all times when the power is turned on.

  FIG. 11 shows a control block diagram of the electric tiller control device 100 of the present embodiment, and shows a secondary battery 48 having a charging circuit and a discharging circuit, a motor 8 and a monitor unit of the LED display unit 26 such as an operating state. FIG. 12 shows a system block diagram centering on the control device 100 to be controlled. The motor 8 is connected to a secondary battery (battery) 48 composed of a charging circuit 45, a discharging circuit 46 and a plurality of battery cells 47, and an operation signal is generated by turning on a limit switch (operation switch) 33. The motor 8 is rotated by supplying current from the battery 48. The battery cell 47 for driving the motor of the secondary battery 48 can be charged by a charger 50 provided separately.

  FIG. 11 shows a control block diagram of the electric tiller control device 100 of the present embodiment, and shows a secondary battery 48 having a charging circuit and a discharging circuit, a motor 8 and a monitor unit of the LED display unit 26 such as an operating state. A system block diagram centering on the control device 100 to be controlled is shown in FIG. The motor 8 is connected to a secondary battery (battery) 48 composed of a charging circuit 45, a discharging circuit 46 and a plurality of battery cells 47, and an operation signal is generated by turning on a limit switch (operation switch) 33. The motor 8 is rotated by supplying current from the battery 48. The battery cell 47 for driving the motor of the secondary battery 48 can be supplemented with electric power from a charger 50 provided separately.

  In the present embodiment, as shown in FIG. 13, the control device 100 is provided with an integration circuit 53 in the reference circuit of the comparison circuit 55 of the battery remaining amount monitor, and the output value of the integration circuit 53 is converted into the integration circuit 52 of the reference voltage circuit 51. Compared with the output value, a control circuit for displaying the result on the battery remaining amount monitor 26c as shown in FIG. 14A through the monitor lighting circuit 57 is provided.

  Therefore, when the integration circuit 53 is provided for the voltage input from the battery 48 to smooth the signal change, the value of the integration circuit 52 that integrates the reference voltage from the reference voltage circuit 51 to be compared is compared with the value of the comparison circuit 55. In addition, the battery 48 is provided with a configuration that matches the voltage input of the battery 48, and the battery remaining amount monitor 26c is provided in the LED display unit 26. When the remaining amount of the battery is relatively small, the battery is displayed in red. When there are many, it is displayed in green.

  In this way, when notifying the operator of the remaining capacity of the battery capacity in two colors, if the remaining power is low and the green to red lights up, the voltage value is likely to fluctuate due to vibration or restart during farm work. Therefore, the remaining amount is determined by temporarily increasing the threshold value so that red lighting does not occur.

  Thus, as shown in FIG. 15, both the reference voltage and the input voltage from the battery have the same rising waveform with respect to the elapsed time, which makes it easier to compare, and the fluctuation of the voltage value is reduced due to vibration or restart during farm work, Red lighting does not occur, and display on the battery remaining amount monitor 26c can be performed appropriately.

  14B shows the relationship between the battery voltage and the display color (green, red) of the battery remaining amount monitor 26c. FIG. 14B shows the voltage from the battery via the integration circuits 52 and 53. After that, the comparison circuit 55 performs voltage determination, and the comparison circuit 55 is provided with a hysteresis circuit 56 to change the threshold value for determining the battery low voltage. By providing the hysteresis circuit 56, there is no blinking during operation (green-red), and when the remaining battery level is low at the end of the operation, there is no operation of returning to green when operation is stopped in red, making it easy to understand. Become.

  As shown in the flowchart of FIG. 16, the lighting of the battery remaining amount monitor 26c does not change the display color for a certain period of time from the start of the motor 8, and remains in the display color of the state of the battery remaining amount monitor 26c before driving. To do. Thereby, the influence on the display of the battery remaining amount monitor 26c by the voltage drop at the time of starting of the motor 8 can be prevented.

  In addition, as shown in the flowchart of FIG. 17, the battery remaining amount monitor 26c is turned on so that the display color is turned on in a steady state color (for example, green) for a predetermined time from the start of the motor 8. good. As a result, the battery voltage is not detected for a certain period of time after the power is turned on, and an initial display (green) can be displayed on the battery remaining amount monitor 26c to notify the operator of the initial state.

  Further, when the voltage drops below a certain value due to a decrease in the capacity of the battery 48, as shown in the flowchart of FIG. 18, the motor drive output is performed by not accepting the input of the limit switch (operation switch) 33. Without controlling the unnecessary discharge of the battery 48. In this way, deterioration of the cells constituting the battery 48 can be prevented.

  Further, as shown in the flowchart of FIG. 19, when the voltage of the battery 48 decreases below a certain value, the input of the limit switch (operation switch) 33 is not accepted, and the display of the battery remaining amount monitor 26c is displayed. By making red indicating that the capacity is reduced, it is possible to reliably notify the operator that the limit switch (operation switch) 33 is ineffective.

  When charging is performed by connecting the battery charger 50 and the battery (secondary battery) 48 shown in the control block diagram of FIG. 12, the battery 48 is charged before the charging is completed on the battery charger 50 side (displayed in green on the monitor 26c). The charging circuit 45 on the side functions to stop charging to prevent overcharging of the cell, and the completion monitor of the charger 50 may not operate normally.

  Therefore, as shown in the flowchart of FIG. 20 and the relationship between the voltage value (V) and the current value (I) with respect to the charging time (T) of the battery 48 of FIG. 21, the voltage of the battery 48 is equal to or higher than a certain voltage, and When the current value is equal to or less than a certain value (A2), it is determined that charging is completed with both voltage and current, and a green display indicating charging completion is displayed on the monitor 26c.

  Further, as shown in the flowchart of FIG. 22 and the relationship between the voltage value and the current value with respect to the charging time of the battery 48 in FIG. 21, the voltage of the battery 48 is equal to or higher than a certain voltage, and the certain time (t1) from the start of charging is When the time has elapsed, it may be determined that the charging is completed, and a green display indicating the charging completion may be performed on the monitor 26c.

  Further, as shown in the flowchart of FIG. 23 and the relationship between the voltage value and the current value with respect to the charging time of the battery 48 in FIG. 21, the battery voltage is equal to or higher than a certain voltage (V1) and the voltage rise change (V−T May be determined to be complete.

Further, as shown in the flowchart of FIG. 24 and the relationship between the voltage value and the current value with respect to the charging time of the battery 48 of FIG. 21, the voltage of the battery 48 is equal to or higher than a constant voltage (V1) and is set to a constant voltage (V1). If a certain time (t2) has elapsed since the start of charging, it may be determined that charging is complete.
By making a determination based on both the voltage and the charging time in this manner, a problem that the completion monitor of the charger does not operate normally can be eliminated, and a more appropriate charge completion determination can be made.

Next, the configuration when the operator carries the electric field cultivator will be described below.
As shown in FIG. 5, the adjustment screws 36 (FIG. 1) for fixing and adjusting the front and rear positions of the left and right operation handles 12a and 12b are loosened to move the operation handles 12a and 12b around the pivot point 36a of the horizontal axis. Tilt to the front of the machine and tighten the adjustment screw 36 (FIG. 3) to fix the position. Then, the connecting rod 38 that connects the left and right operation handles 12a and 12b is configured to be positioned at the approximate center of the longitudinal direction of the fuselage at the approximate center of gravity of the fuselage and above the battery case 9. The operator can prevent the battery case 9 from being detached when carrying the electric tiller by carrying the connecting rod 38 or the connecting rod 38 and the bumper 39 at the front end of the machine body. In addition, the connecting rod 38 is configured to be substantially gate-mounted when viewed from the front when the left and right operation handles 12a and 12b are tilted forward, and the left and right operation handles 12a and 12b are moved downward without contacting the battery case 9. It can be defeated. At the time of carrying the electric tiller, the bucket 40 attached to the position covering the lower part of the rotary part R is attached to the machine body with a band (not shown) or the like, and the soil adhering to the rotary part R falls, It is possible to prevent the soil from being scattered around.

Next, the configuration of the front / rear balance of the electric power tiller of the present embodiment will be described below.
The axial center of the motor shaft 8a of the motor 8 arranged in the vertical direction is configured before the axial center position of the rotary shaft 3, and a battery case 9 is provided behind the axial center position of the rotary shaft 3. The handle frame 11 is provided at the rear. With this configuration, the center of gravity is taken near the battery case 9, and even if the capacity of the battery 48 accommodated in the battery case 9 is changed to change the weight of the battery case 9, the change in the center of gravity of the body is small.

Next, the configuration of the LED display unit will be described below.
In the vicinity of the power switch 16, a plurality of LED display portions 26 (FIG. 3) showing various operation states are provided. In the present embodiment, a power on / off LED display unit 26a, an operation on / off LED display unit 26b, and a battery remaining amount LED display unit 26c are provided. In the LED display unit 26a that is turned on and off, the first color green is emitted when the power switch is turned on, and when the overload is detected and a protection circuit (not shown) provided in the wiring 20 is activated, the second color is obtained. Red light is emitted. When the limit switch 33 is turned on and the rotary portion R is driven in the on / off LED 26b, green is emitted as the first color, and the second circuit is activated when a protection circuit (not shown) by a temperature sensor built in the motor 8 is activated. The color red emits light. When the remaining amount of the battery 48 is normal, the LED indicator 26c for the remaining battery level emits green, which is the first color, and emits red, which is the second color, when the remaining amount is less than the set amount.

  In this way, various operation states are displayed on the LED display unit 26, and many operations can be displayed with a small number of LEDs by appropriately changing the color from the first color to the second color. By arranging the LED display unit 26 at a position that is easy to see from the operation side, it is easy to check various driving situations. Further, since the LED display unit 26 is provided adjacent to the power switch 16, the LED display unit 26 can be easily confirmed at all times when the power is turned on.

  Although this embodiment has been described with an electric power tiller, it may also be used for a walking-type working machine that uses other energy that does not have a driving sound.

DESCRIPTION OF SYMBOLS 1 Airframe frame 2 Transmission frame 3 Rotary shaft 4 Rotary claw 5 Side disk 6 Rotary cover 6a Wall part 6b Opening part 6c Inclination part 6d Rear support wall part 7 Motor cover 7a Recessed part 8 Drive motor 8a Motor shaft 9 Battery case 9a Handle 9b Foot 9c Convex portion 10 Mounting table 10a Hole 10b Opening portion 11 Handle frames 12a and 12b Operation handles 13a and 13b Handle grip 14 Support wheel 15 Resistance rod 16 Power switch 17 Operation lever 17a Switch operation portion 17b Holding portion 19 Charging terminal 20 Wiring 25 Spring 26 LED display part 26a LED display part 26b for turning on / off the power LED display part 26c for turning on / off the battery LED display part 29 for remaining battery level 29 Inverted U-shaped cover (member)
30 Horizontal axis 30a Protrusion 31 Movement axis 31a Small diameter part 31b Large diameter part 31c Push part 33 Limit switch (operation switch)
35 Spring 36 Adjustment screw 36a Rotation fulcrum 38 Connecting rod 39 Bumper 40 Bucket 41 Transmission shaft 45 Charging circuit 46 Discharging circuit 47 Battery cell 48 Secondary battery (battery)
DESCRIPTION OF SYMBOLS 50 Charger 51 Reference voltage circuit 52 Integration circuit 53 Integration circuit 55 Comparison circuit 56 Hysteresis circuit 57 Monitor lighting circuit 100 Controller T Operation safety device R Rotary part

Claims (2)

A rotary part (R) for tilling the field, a motor (8) for driving the rotary part (R), a transmission shaft (41) for transmitting the power of the motor (8) to the rotary part (R), and a transmission shaft ( 41) a transmission frame (2), a body frame (1) fixed to the upper part of the transmission frame (2), and a battery (48) which is a power source of a motor (8) mounted on the body frame (1). )
A battery remaining amount display part (26c) for displaying the remaining amount of electric capacity of the battery (48) is provided on the machine body frame (1), and the battery remaining amount display part (26c) has a battery remaining amount indicating the motor (8). A display area that can distinguish and display a state sufficient for driving the motor and a state not sufficient for driving the motor (8) by a predetermined threshold,
An electric field cultivator comprising a control device (100) for raising a threshold value from the preset value when a remaining battery level is less than or equal to the preset threshold value.   When the remaining amount of the battery is sufficient for driving the motor (8) before starting, the control device (100) displays a remaining amount display unit until a predetermined time elapses after the starting of the motor (8). The electric field cultivator according to claim 1, wherein the display when the remaining battery level is sufficient is continued in (26c).

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