JP5761276B2 - Walk-type field cultivator - Google Patents

Description

  The present invention relates to a walking type tiller.

  Patent Literature 1 to Patent Literature 3 describe a technique for housing a rotary portion of a walking type tiller in a housing case.

JP 2003-212160 A JP 2004-275106 A JP 2005-229826 A

  In Patent Document 1 to Patent Document 3, when the rotary part is accommodated in or removed from the case, it is necessary to lift the entire walking-type tiller that is a heavy object.

In order to solve this technical problem, the present invention provides a rotary portion (R) for attaching a plurality of rotary claws (4) to a rotary shaft (3) extending in the left-right direction, and a rotary portion (R). ), A handle frame (11) that extends obliquely rearward, and left and right operation handles (12a, 12b) that are branched from the handle frame (11). (40f) and a rear wall (40r) lower than the front wall (40f) are moved forward in a state where the bucket (40) is supported by the support wheels (14), and the rotary part (R) is moved to the rear wall (40r). If) overcame enters the bucket (40), covers the lower rotary unit (R) in the bucket (40), when the rotary portion (R) was entered in the bucket (40), a bucket (4 ) The rear wall (40r) is positioned between the rotary part (R) and the support wheel (14), and the rubber band (41A) is engaged with the bucket (40) and the hook (10a) provided on the machine body side. It is set as the walking type tiller characterized by having the structure to do .

In the present invention, the rotary part R can be easily entered into the bucket 40 by moving forward while the bucket 40 is placed on the ground and supported by the support wheels 14 from the rear, so that handling is excellent in each stage. Yes.
In addition, it is possible to prevent the soil adhering to the rotary portion R from falling, and to prevent the soil from being scattered around when being carried.

  Further, coupled with the use of a flexible rubber band, handling properties such as attachment and removal are excellent in each stage.

Side view of electric field cultivator Rear view of electric field cultivator Top view of electric field cultivator Enlarged side view of an electric power tiller Front view inside the battery case Block Diagram Front view of battery case (A) and rear view of battery case (B) Bottom view of battery case (A) and side view of battery case (B) Side view showing operation of safety device (A) (B) Plan views showing the operation of the safety device (A) (B) Side view showing the handle folded Perspective view of bucket Enlarged side view of the handle frame

An example of the walking type working machine of the present invention will be described with reference to the drawings using an electric power tiller.
Reference numeral 2 denotes a transmission frame that houses a transmission shaft 8a. A dish-shaped body frame 10 is fixed to the upper part of the transmission frame 8a, and the work machine frame 1 extends rearward from the transmission frame 2. A rotary shaft 3 that is rotationally driven around the horizontal axis by transmission through the transmission shaft 8a is pivotally supported at the lower portion of the transmission frame 2, and a plurality of outer periphery of the rotary shaft 3 extending in the left-right direction from the transmission frame 2 is provided on the outer periphery. A rotary claw 4 is provided, and side disks 5 and 5 are attached to the left and right ends of the rotary shaft 3 to form a rotary portion R.

  A disk-shaped rotary cover 6 that covers the upper portion of the rotary part R is attached to the upper part of the body frame 10. 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 is formed along the inside of the wall portion 6a. A motor cover 7 is attached to the front side of the opening, and an electric motor 8 for transmitting power to the transmission shaft 8a is provided inside the motor cover 7, and a battery containing a battery B is provided behind the opening. The case 9 is removably inserted. The electric motor 8 and the battery case 9 are placed on the body frame 10 and are arranged to penetrate through the opening.

  A front lower end side of a handle frame 11 is attached to a rear portion of the work machine frame 1. The handle frame 11 extends obliquely rearward and rearward. The left and right operation handles 12a and 12b are branched from the rear end side of the handle frame 11, and the grip 13a is provided at the rear ends of the left and right operation handles 12a and 12b. , 13b.

  At the rear end of the work machine frame 1, a support wheel 14 that supports the machine body when moving the electric power tiller and a resistance rod 15 that prevents dashing during the tilling work are attached. FIG. 1 shows a working posture in which the support wheel 14 is flipped up.

Next, the driving configuration of the aircraft will be described.
A power switch 16 for turning on and off the power is provided at a branch position between the handle frame 11 and the operation handles 12a and 12b, and an operation lever 17 for turning on and off the drive of the electric motor 8 is provided in the vicinity of the left and right grips 13b. On the rear surface of the battery case 9, an output terminal 18 of a motor drive circuit 20 that connects the battery B in the battery case 9 and the electric motor 8 and a charging terminal 19 for charging the battery B are provided.

  Here, the internal structure of the battery case 9 will be described. The battery case 9 has a rectangular parallelepiped shape and includes the output terminal 18 and the charging terminal 19 on the rear outer wall, and the front wall is configured as a detachable cover 9a. In such a battery case 9, a battery B composed of a plurality of cells 41, 41 occupying 1/2 or more of the volume thereof, and a charge control board 42 in which a charge control circuit 42 a is incorporated on the upper surface of each cell 41, 41. , 42 are provided so that they can be inserted and removed by sliding the front and rear guide ribs 9b, 9b back and forth. The terminals of the charge control board 42 are connected to the charge terminals 19 (two sets of terminals in the illustrated example) while being connected directly to the cells 41 and 41.

  A discharge control board 43 incorporating a discharge control circuit 43a is provided above the charge control boards 42 and 42 disposed on substantially the same plane and spaced from each other at an appropriate interval. Ribs 9c and 9c are formed on the inner peripheral side wall portion of the battery case 9 so as to form a front-rear guide recess, and the end of the discharge control base 43 is inserted into the guide recess and slid to be attached or detached. . The discharge control board 43 has a circuit configuration so that a voltage resulting from the series connection of the plurality of battery cells 41 and 41 can be output to the output terminal 18. On the inner side surface of the battery case 9, ribs 9d, 9d,... That are spaced apart from the battery cells 41, 41 and the inner wall are provided.

  The charge control boards 42, 42 incorporate an overcharge prevention circuit 44, while the discharge control board 43 has an overcurrent protection circuit 45, an ON / OFF signal smoothing circuit 46, a surge current control circuit 47, an overdischarge prevention circuit 48, A short circuit prevention circuit 49 is incorporated. Of these, the short-circuit prevention for the discharge control board 43 can be prevented by the short-circuit prevention circuit 49, but the short-circuit prevention for the charge control circuits 42, 42 is not provided for each of the discharge control boards 42, 42. The short-circuit prevention circuit 50 is provided in the battery case 9 between the charging terminal 19 and the discharge control boards 42 and 42 so as to be freely inserted and removed vertically on one side of the discharge control board 43.

  Next, the output terminal 18 of the battery case 9 will be described. The output terminals 18a and 18a to the electric motor 8 are two plus and minus terminals and are connected to the electric motor 8 side by the motor drive circuit 20, but the remaining two terminals 18b and 18b are signal input / output terminals. It is. In other words, the pair of terminals 18b and 18b can input an ON / OFF signal from the signal control board 51 to the power switch 16 or the limit switch 33 linked to the operation lever 17, and can output a control signal to the discharge control circuit 43a. Based on the output from the control circuit 43a, the remaining battery level and a warning display signal to be described later are input from the signal control board 51 and output to the power on / off LED 26a, the driving warning LED 26b, and the remaining battery level LED 26c.

  The output terminals 18 a and 18 a are connected to the electric motor 8 through a breaker 55. In other words, the breaker 55 includes an operation unit 55a for switching the motor drive circuit 20 between connection and disconnection. The operation unit 55a incorporates a solenoid (not shown), and is excited when the current value of the motor drive circuit 20 rises to operate the operation unit 55a. The motor drive circuit 20 is shut off and the electric motor 8 is turned off. The operation part 55 a of the breaker 55 is disposed on the upper surface of the rotary cover 6.

  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. ing. In addition, since the output terminal 18 and the charging terminal 19 are arranged on both the left and right sides of the handle frame 11 in the rear view, it is possible to prevent the right and left from being inserted incorrectly.

  The motor drive circuit 20 that connects the breaker 55 and the electric motor 8 passes through the space between the lower part of the battery case 9 and the lower part of the inclined part 6 c formed on the outer periphery of the wall part 6 a of the rotary cover 6 and the body frame 10. It is configured to do.

  The battery case 9 has a handle 9e on the upper surface, a plurality of position fixing projections 9f on the lower surface, and the position fixing projections 9f are inserted into the position fixing holes 10a formed in the body frame 10. By doing so, the mounting position of the battery case 9 can be fixed. The battery case 9 is supported by the wall portion 6 a of the rotary cover 6 at the left and right side surfaces, and has a protruding portion 9 g for fixing the position that is long in the vertical direction on the front surface. It is set as the structure engaged with the recessed part 7a for use. In addition, an opening 10b is provided in the center of the left and right sides of the body frame 10 so that water that has flowed into the body frame 10 with rain water or the like can be drained.

  When the battery case 9 is set on the fuselage, the position fixing convex portion 9g is made to correspond to the position fixing concave portion 7a, and both are put in a fitted state, and the position fixing convex portion 9f is used for position fixing. The position of the battery case 9 is fixed by being inserted into the hole 10a. When the battery case 9 is taken out, it can be taken out simply by pulling up the handle 9e.

  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 formed by the wall part attached to the body frame 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.

  The cover 9a of the battery case 9 is located between the motor cover 7 and is formed inside the outer periphery of the main body of the battery case 9, and the outer periphery of the motor cover 7 and the battery case 9 is substantially omitted. By forming them together, the gap is reduced and the cover 9a cannot be visually recognized from the appearance, so that the aesthetic appearance is enhanced and the intrusion of rainwater is also reduced.

Next, the safety device T for the operation lever 17 will be described.
The operating lever 17 is configured to rotate around the fulcrum 30 of the horizontal axis, and is provided with a switch operating part 17 a formed on the front side of the fulcrum 30 and a gripping part 17 b formed on the rear side of the fulcrum 30. Reference numeral 33 denotes a limit switch for inputting a signal to the control unit of the signal control board 51 in order to turn on / off the drive of the electric motor 8, and the drive of the electric motor 8 is turned on / off by the turning operation of the switch operation unit 17a. Reference numeral 25 denotes a spring for returning the operating lever 17 gripped and rotated to the initial position.

  A moving shaft 31 is provided above the gripping portion 17b and supported in a direction (left-right direction) intersecting the gripping portion 17b and sliding in the left-right direction. 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 35 is wound around the moving shaft 31 adjacent to the pushing portion 31c. . 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 safety device T (FIG. 10 (A)).

The operation at the time of tilling work of the operation lever 17 and the safety device T will be described below.
The state of charge of the battery B is confirmed by the presence or absence of blinking of the battery remaining amount LED 53, and if it is insufficient, a charger or a 100V power source is connected to the charging terminal 19 and predetermined charging is performed.

  When starting the tilling work, the power switch 16 is turned on, the pushing portion 31c formed at the end of the moving shaft 31 is pushed with the thumb, and the small diameter portion 31a is positioned on the rotation locus of the operation lever 17 (FIG. 10). (B)) Then, the operator grasps the grasping portion 17b and rotates to a position where the limit switch 33 is turned on. The ON signal of the limit switch 33 is transmitted to the discharge control circuit 43a via the signal control board 51, and the electric motor 8 is driven by the battery B. In response to the rotation of the electric motor 8, the rotary part R rotates and the tilling work is performed (FIG. 9B).

  When stopping the tilling work, when the operator releases the gripping part 17b, the switch operating part 17a is rotated to the initial position by the action of the spring 25, the OFF signal of the limit switch 33 is transmitted, and the driving current of the battery B is cut off. Then, the rotary part R stops (FIG. 9A).

  Even when the operator is carrying the electric power tiller with the power switch 16 turned on, the gripping portion 17b moves even if the gripping portion 17b rotates unexpectedly by contacting the gripping portion 17b of the operating lever 17. The operator touches the large-diameter portion 31b of the shaft 31 so that the switch operating portion 17a does not rotate to the position where the limit switch 33 is turned on, the limit switch 33 is not turned on, and the power switch 16 is turned on. Even when it is carried without being noticed, the rotary portion R will not rotate unexpectedly, so it is safe.

  When a load is applied to the motor drive circuit 20 and the current exceeds a predetermined value, the breaker 55 causes the motor drive circuit 20 to act on the cut-off side, and also switches the operation unit 55a to the cut side. Therefore, when starting up again, the operation unit 55a is operated to switch to ON. When the rotary part R is maintained, the operation part 55a of the breaker 55 is operated to switch the motor drive circuit 20 to the shut-off side (off), so that the non-drive of the electric motor 8 can be ensured reliably and safely. is there.

  Since the operation portion 55a is disposed on the rotary cover 6 portion (the left side of the rear portion of the rotary cover 6 in the illustrated example), the operation portion 55a is conveniently located near the maintenance work target location. That is, if the power switch 16 is disposed on the handle frame 11, it is easy for the operator to operate the handle, but it is inconvenient because it is inconvenient when the rotary portion R is maintained, but as described above. Constructing on the upper surface of the cover 6 is easy to reach and convenient.

  The overcurrent protection circuit 45 configured on the discharge control board 43 is configured to stop the discharge output when the overcurrent of the discharge control circuit 43a is detected, and no current flows through the motor drive circuit 20. Further, the ON / OFF signal smoothing circuit 46 ensures smooth transmission by smoothing the current even when the current at startup is unstable. Further, the surge current control circuit 47 prevents the generation of a surge current that may occur when the limit switch 33 is repeatedly turned on and off by the operation lever 17 at the time of activation. Therefore, the ON / OFF signal smoothing circuit 46 and the surge current control circuit 47 have a circuit configuration accompanying the connection / disconnection of the limit switch 33 by the mechanical operation lever 17.

  Further, the overdischarge prevention circuit 48 of the discharge control board 43 suppresses and controls the voltage from the battery B to a predetermined value or lower (for example, 18 V or lower) when the voltage from the battery B is excessive. The short-circuit prevention circuit 49 is related to protection of the discharge control circuit 43a when the output terminal 18 is short-circuited, and the charge control circuit when the other short-circuit prevention circuit 50 is short-circuited at the charge terminal 19 part. 42a part can be protected.

  The configuration of the controller according to the present embodiment is such that the charge control boards 42 and 42 are directly connected to the battery cells 41 and 41 and accommodated in the battery case 9, and the discharge control board 43 is the charge control boards 42 and 42. Is configured to be mounted in the battery case 9 with a vertical spacing, so that the connection between the charge control boards 42 and 42 and the battery cells 41 and 41 can be made wirelessly and compact, The discharge control board 43 can be attached and detached independently from the battery cells 41 and 41 and the charge control boards 42 and 42, and the assembly property and the disassembly maintenance property are good.

  Further, the charge control circuits 42a and 42a of the charge control boards 42 and 42 and the charge terminal 19 are connected in parallel to perform the parallel connection processing for the battery cells 41 and 41, and the discharge control circuit of the discharge control board 43. The battery cells 41 and 41 are output to the electric motor 8 via the output terminal 18 by serial connection with respect to 43a, and there is an effect that the parallel connection and the serial connection can be effectively assembled.

  In addition, since it is the structure which arrange | positions the charge control board | substrates 42 and 42 in the upper part of the battery cells 41 and 41 and inserts in the battery case 9, even if a water | moisture content penetrates, it accumulates below and influences board | substrates 42 and 42 itself. Less is.

Next, the configuration when carrying the electric field cultivator will be described below.
Reference numeral 36 denotes a tightening knob for fixing and adjusting the front and rear positions of the left and right operation handles 12a and 12b. The tightening knob 36 is loosened so that the operation handles 12a and 12b are moved to the front side of the body around the pivot point 37 of the horizontal axis. Then, the tightening knob 36 is tightened to fix the position (see FIG. 11). Then, the connecting rod 38 that connects the left and right operation handles 12a, 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. An operator can prevent the battery case 9 from being detached when carrying the electric tiller by holding the connecting rod 38 or the connecting rod 38 and the bumper 39 at the front end of the machine body. Further, the connecting rod 38 is configured to have a substantially gate structure when viewed from the front when the left and right operation handles 12a and 12b are tilted forward. It can be defeated.

  Reference numeral 40 denotes a bucket that is attached at a position that covers the bottom of the rotary portion R when being carried. Protruding portions 40a that can engage the flexible rubber band 41A are provided on the left and right sides, and a hole 41a provided on the upper portion of the rubber band 41A is provided in the body. It is configured to be locked to the hook portion 10a formed on the side surface of the frame 10 and attached to the airframe, so that the soil adhering to the rotary portion R can be prevented from falling, and the soil can be prevented from scattering around when being carried. it can. The bucket 40 has a rear wall 40r that is lower than the front wall 40f. Therefore, it is possible to easily enter the bucket 40 by advancing the cultivator from the rear with the bucket 40 placed on the ground. Therefore, in conjunction with the use of the flexible rubber band, the rotary cover is folded downward as in the prior art. Compared to the structure that surrounds the bottom of the rotary part and the support structure that uses the support pipe of the resistance rod, the handleability such as mounting and removal is excellent in each stage. Reference numerals 40b and 40b denote holes for allowing the rubber band 41A to pass therethrough.

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 in front of the axial center position of the rotary shaft 4, a battery case 9 is provided behind the axial center position of the rotary shaft 4, and the battery case 9 The handle frame 11 is provided at the rear. With this configuration, a center of gravity is obtained near the battery case 9, and even if the capacity of the battery 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 26 will be described below.
A plurality of LEDs 26 indicating various operating states are provided in the vicinity of the power switch 16. That is, the power switch 16 and the LED 26 are provided on the inclined upper surface 60 a of the cover member 60 supported by the handle frame 11. The LED 26 and a holder 61 that supports the signal control board 51 to be positioned below the LED 26 are provided. The signal control board 51 receives the power switch 16 signal and the limit switch 33 signal and is connected to a pair 18 b and 18 b of the output terminal 18 by a wiring 62.

  In the present embodiment, a power on / off LED 26a, an operation on / off LED 26b, and a battery remaining amount LED 26c are provided. When the power switch is turned on, the first color green emits light when the power is turned on and off, and when the overcurrent protection circuit 45 provided in the wiring 20 is activated by detecting an overload, the second color red 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. The battery remaining amount LED 26c emits green, which is the first color, when the remaining amount of the battery is normal, and emits red, which is the second color, when the remaining amount is equal to or less than the set amount. The power-on / off LED 26a may be omitted.

  In this way, various operation states are displayed with LEDs, and by appropriately changing the color from the first color to the second color, a large number of operation displays can be performed with a small number of LEDs, and in one place. It is easy to check various driving situations by placing the LEDs in a concentrated position that is easy to see from the operation side. Further, by providing the LED adjacent to the power switch 16, it is easy to always check the LED when the power is turned on and the power is turned off.

Rotary shaft 3
Rotary claw 4
Handle frame 11
Operation handle 12a
Operation handle 12b
Bucket 40
Convex part 40a
Front wall 40f
Rear wall 40r
Rubber band 41A
Rotary part R

Claims (1)

A rotary portion (R) for attaching a plurality of rotary claws (4) to a rotary shaft (3) extending in the left-right direction, a support wheel (14) provided at the rear of the rotary portion (R), and a handle extending obliquely rearward A frame (11) and left and right operation handles (12a, 12b) provided by branching from the handle frame (11);
The bucket (40) having a front wall (40f) and a rear wall (40r) lower than the front wall (40f) is advanced in a state supported by the support wheels (14), and the rotary portion (R) is moved to the rear wall. (40r) gets over and enters the bucket (40), the bucket (40) covers the lower part of the rotary part (R) ,
When the rotary part (R) is made to enter the bucket (40), the rear wall (40r) of the bucket (40) is positioned between the rotary part (R) and the support wheel (14). 40) and a hook (10a) provided on the machine body side so that rubber bands (41A) can be engaged with each other .

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