JPS6340339Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an electric management machine that performs tillage work by driving a tillage rotary using an electric motor installed in the machine body.

"Prior Art" Conventionally, as shown in Japanese Utility Model Application Publication No. 52-76057, there has been an electric handcart driven by an electric motor.

``Problems to be solved by the invention'' However, the above-mentioned conventional technology uses an electric motor to drive the wheels when going up a slope, but only uses the electric motor as a generator when going down a slope. However, when the wheels are driven by the electric motor, the motor load cannot be detected, and the speed of the electric motor must be controlled manually, making it impossible to move the wheels at a stable speed.

Therefore, even if the above-mentioned conventional technology is applied to a management machine, the working speed becomes unstable due to load changes due to field conditions, etc., and it is difficult to simplify handling operations such as speed control and improve the efficiency of agricultural work. There was a problem.

In addition, as shown in Japanese Utility Model Application Publication No. 55-107430, there was a technology to hydraulically drive agricultural machinery and increase or decrease the speed of the drive vehicle by changing the load. Since the machine was designed to increase speed at a small speed, in a control machine that has a tiller claw on the axle and runs while tilling by rotating the tiller claw, the load is large and the work is stopped by slowing down the axle. Therefore, there were problems such as difficulty in improving the efficiency of agricultural work and simplifying handling operations.

In addition, as shown in Japanese Patent Application Laid-Open No. 57-95218, there was a technology for detecting overload of the bodywork and increasing the speed of the vehicle prime mover in a garbage collection vehicle equipped with a garbage processing device. The purpose of this system is to provide a vehicle prime mover that obtains a running driving force of 1,000 yen, and a hydraulic system that drives a garbage processing device, and to drive the prime mover so as to obtain the minimum output necessary to drive the hydraulic system. However, even if this prior art was applied to a management machine, there were structural problems such as the drive structure of the tiller claws being complicated, making it difficult to simplify handling operations and reduce manufacturing costs.

``Means for Solving the Problems'' However, the present invention has a steering handle extended above the rear side of the machine case, and a tilling claw installed on the lower end of the machine case via an axle. Further, an electric motor for driving the tilling claws is disposed on the upper end side of the machine case, and a sensor detects the driving load of the tilling claws based on a change in the rotational speed of the electric motor;
A speed control mechanism for changing the rotational speed of the electric motor is provided, and the tilling claws are driven at a substantially constant speed by automatically controlling the speed control mechanism based on the detection result of the sensor. It is something.

"Function" Therefore, even if the driving load of the tilling claws changes, the driving force of the tilling claws by the electric motor is maintained at a substantially constant level, so even if the driving force of the tilling claws changes, the driving force of the tilling claws by the electric motor can be maintained at a substantially constant level. This eliminates the problem of the driving force of the tilling claws being too small or too large, and the traveling speed and tilling force of the tilling claws can be stably obtained, and there is no need to install a medium between the driving force and the prime mover such as a conventional hydraulic drive device. The tilling claws can be easily driven, and compared to the conventional method, handling and operability can be improved and manufacturing costs can be easily reduced.

"Example" Hereinafter, an example of the present invention will be described in detail based on the drawings.

Fig. 1 is an overall side view of the electric power management machine according to the present invention, and Fig. 2 is a plan view thereof, in which 1 is a commutator electric motor that rotates at high speed, and 2 is a transmission reduction case that fixedly supports the motor 1. , 3 is the reduction case 2
4 is a tilling rotary that is an attachment that is pivotally supported on the lower end of the axle case 3; 5 is a rotary rotary that is removably fixed and supported on the axle case 3; 4 a fender covering the upper area; 6 a steering handle whose base end is removably attached to the intermediate rear portion of the axle case 3 via a fixed mounting plate 7 and a handle holder 8; 9 a mounting plate 10 at the rear of the handle holder 8; , a resistance rod 13 is attached to the handle 6 so as to be adjustable in height via a resistance holder 11 and a bolt 12, and is used to turn the electric motor 1 on and off.
This is an operation switch that is turned off, and is configured to rotate the rotary 4 by driving the electric motor 1 to perform plowing work and at the same time cause the machine to travel.

As shown in FIGS. 3 to 5, the deceleration case 2 is made up of left and right case bodies 2a and 2b that are formed separately and fixed together through bolts 14. A bolt 15 is attached to the rear end side of the right case body 2b. Through the motor 1
is fixed horizontally, and the upper end of the front axle case 3 is connected to the front end side of the right case body 2b via a bolt 16 and a flange 17.

In addition, a bracket 1 is installed in the middle of the axle case 3.
8 and bolts 19, and the housing 20 is attached to the lower end of the case 3.
The tilling pawl 25 and guide ring 26 of the rotary 4 are mounted on the axle 21 via mounting pins 22, 23 and an auxiliary cylinder shaft 24.

Further, inside the deceleration case 2, there are a small diameter timing pulley 28 attached to the output shaft 27 of the motor 1, and large and small diameter timing pulleys 30 and 31 attached to the first counter shaft 29, respectively.
Large and small diameter timing pulleys 33 and 34 respectively attached to the second counter shaft 32, large diameter timing pulley 36 attached to the deceleration output shaft 35, and each of these pulleys 28, 30, 31, 33, 34,
Timing belt 37, 3 stretched between 36 and 36
8 and 39, and is configured to rotate the output shaft 35 at a reduced speed when the electric motor 1 is driven.

Furthermore, the axle case 3 is provided with a small diameter sprocket 40 attached to the output shaft 35, a large diameter sprocket 41 attached to the axle 21, and a chain 42 that stretches between these sprockets 40, 41. 35 is configured to be decelerated and transmitted to the axle 21.

By the way, the pulse generating disk 43 is attached to the output shaft 27 of the motor 1, and the left case body 2
A photoelectric rotation sensor 44 is provided at the sensor a, and the rotation speed of the motor 1 is detected by receiving reflected pulse light from the photoelectric rotation sensor 44.

FIG. 6 shows a rotation control circuit diagram of the motor 1, in which an AC circuit connecting an AC power source 45 and the motor 1 includes a variable resistor 46, a capacitor 47,
Diac 48, which is a two-way two-pole thyristor, and triax 49, which is a two-way three-pole thyristor.
Incorporating a speed control mechanism 50 consisting of the like, the gate signal, that is, the gate current of the triax 49 is changed by the variable resistor 46, and
By controlling this gate current, the output voltage of the triax 49 is adjusted, and the rotation speed of the motor 1 is variably adjusted. It is configured to perform speed control.

As described above, the steering handle 6 is extended above the rear side of the chain case 3, the tilling claws 25 are installed on the lower end side of the machine case 3 via the axle 21, and the tilling claws 25 are driven. An electric motor 1 is disposed on the upper end side of the chain case 3, and a sensor 44 is provided to detect the drive load of the tilling claws 25 by a change in the rotation speed of the electric motor 1, and the rotation speed of the electric motor 1 is changed. A speed control mechanism 50 is provided, and the speed control mechanism 50 is automatically controlled based on the detection result of the sensor 44 to drive the tilling claws 25 at a substantially constant speed.

This embodiment is constructed as described above, and the rotation speed of the tilling rotary 4 can be easily controlled to a desired value using extremely simple means. Even if the nature of the hard and soft soil changes, the rotary 4 can be quickly adjusted to the optimal rotational speed and work can be performed satisfactorily. Further, a rotary rotation indicator 51 connected to the rotation sensor 44
By installing this on the handle 6, the operator can constantly check the rotational speed of the rotary 4 while working, and can also perform accurate gear shifting operations.

FIG. 7 shows a modification of the speed control mechanism 50 described above, and since this configuration also has substantially the same effects as the aforementioned embodiment, the same reference numerals are given and detailed explanation thereof will be omitted.

FIG. 8 shows yet another modified structure of the speed control mechanism 50 described above, which includes a full-wave rectifier circuit 52, a variable resistor 53, a capacitor 54, a reverse voltage prevention diode 55, and a reverse blocking three A polar thyristor 56 is provided, and the thyristor 56 is controlled by forward current control by the variable resistor 53.
The speed of the motor 1 is adjusted by adjusting the output voltage of the motor 1.

FIG. 9 shows a speed control mechanism 50 that starts the motor 1 at a low speed when starting.
a full-wave rectifier 57 that is a drive power source for speed control;
A constant voltage diode 58 and a capacitor 59 that keep the output voltage of the rectifier 57 standard and smooth, and a triax 6 that appropriately applies the power source 45 to the motor 1.
Speed control transformer 6 that inputs a gate signal to
1 and a gate input variable resistor 62 for varying this gate signal, and a capacitor 63 and a first transistor 64 for controlling the voltage at startup are connected to the input resistor 62 via a diode 65. a second transistor 66 that applies the power output from the rectifier 57 to the transformer 61;
is connected to the variable resistor 62 via a thyristor 67, and the gate signal of the triax 60 is controlled by controlling the voltage for a certain period of time at the capacitor 63 at the time of starting, and the output voltage is kept within a reference level. Let it be in a state of increasing sequentially,
The motor 1 is configured to start at a low speed.

FIG. 10 shows an automatic control circuit, which is configured to control the rotation of the motor 1 at a constant level regardless of increases or decreases in load, as shown by the imaginary lines in FIGS. 6 and 7. , a servo motor 68 is provided for adjusting the variable resistors 46 and 53 for changing the speed of the speed control mechanism 50, and the rotation sensor 4
4 is connected to the motor 68 via a buffer circuit 69, a differential amplifier 71 having a reference setter 70, a control circuit 72, and rotation increase/deceleration drive circuits 73, 74, so that the rotation of the electric motor 1 increases from the reference value. Alternatively, when a signal is outputted from the differential amplifier 71 via the sensor 44 during deceleration, the servo motor 68 is driven to increase or decrease speed to maintain the constant rotation of the axle 21 driven by the electric motor 1. As a result, the rotation of the rotary 4, which is an attachment, can be maintained constant regardless of the work load.

"Effects of the Invention" As is clear from the above embodiments, the present invention has the steering handle 6 extended above the rear side of the machine case 3, and the tilling claw connected to the lower end of the machine case 3 via the axle 21. 25, and an electric motor 1 for driving the tilling claws 25 is disposed on the upper end side of the machine case 3, and the driving load of the tilling claws 25 is detected by a change in the rotational speed of the electric motor 1. A sensor 44 and a speed control mechanism 50 for changing the rotation speed of the electric motor 1 are provided, and the speed control mechanism 50 is automatically controlled based on the detection result of the sensor 44 to drive the tilling claws 25 at a substantially constant speed. With this structure, even if the driving load of the tilling claws 25 changes, the driving force of the tilling claws 25 by the electric motor 1 is maintained at a substantially constant level. It is possible to eliminate the problem of the driving force of the tilling claws 25 being too small or too large due to the difference in the properties of the tilling claws 25, and it is possible to stably obtain the traveling speed and tilling force of the tilling claws 25.
The tilling claws 25 can be easily driven without installing a medium between the prime mover such as a conventional hydraulic drive device, and it is practical, such as being able to easily improve handling operability and reduce manufacturing costs compared to conventional systems. It has a certain effect.

[Brief explanation of drawings]

Fig. 1 is an overall side view showing one embodiment of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a side sectional view of the main parts, Fig. 4 is an explanatory plan view of the same, and Fig. 5 is a drive An explanatory diagram showing the state, FIG. 6 is an electric circuit diagram of the main part, FIGS. 7 to 9 are electric circuit diagrams showing modifications of FIG. 6,
FIG. 10 is an automatic control circuit diagram. 1... Electric motor, 3... Chain case (main unit case), 6... Steering handle, 21... Axle,
25... Cultivating claw, 44... Rotation sensor, 50...
Speed control mechanism.

Claims (1)

[Scope of utility model registration request] A steering handle 6 extends above the rear side of the machine case 3, a tilling claw 25 is installed on the lower end side of the machine case 3 via an axle 21, and an electric motor 1 drives the tilling claw 25. are arranged on the upper end side of the machine case 3, a sensor 44 detects the drive load of the tilling claws 25 based on a change in the rotation speed of the electric motor 1, and a speed control mechanism that changes the rotation speed of the electric motor 1. 50, the sensor 44
An electric management machine characterized in that it is configured to automatically control a speed control mechanism 50 based on the detection result to drive the tilling claws 25 at a substantially constant speed.