JPH0637631Y2 - Rotational speed adjustment device for drive mechanism in mobile agricultural machinery - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a rotation speed adjusting device for a drive mechanism in a mobile agricultural machine that travels while operating a drive mechanism such as a fertilizer pump such as a fertilizer applicator or a seeder. Is.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of mobile agricultural machine, when this is a fertilizer applicator, a drive mechanism and a drive mechanism are provided so that the fertilizer application amount (working amount) can be adjusted steplessly if necessary. There is a rotation speed adjusting mechanism provided in the power transmission path to the fertilizer pump.
And this rotation speed adjustment mechanism is configured by using a drive source such as a motor for the adjustment, but conventionally, when the control speed is constant and the pump rotation speed reaches a target rotation speed, It is configured to detect that the actual rotation speed of the fertilizer pump has reached the target rotation speed, and stop the speed adjustment by the rotation speed adjustment mechanism according to the control command based on this.

However, in this case, there is an unavoidable loss of time from when the target speed is reached and the speed adjustment stop command is output until the speed adjustment mechanism actually stops, which makes the fertilizer pump a target. It becomes an overrun state rotation speed exceeding the rotation speed, and this time, the speed adjustment control of the rotation speed to the opposite side will be made in the same way in order to adjust this excess amount, and it will be the purpose. A so-called hunting phenomenon occurs in which this is repeated until the number of rotations is reached, and it is not possible to quickly and accurately adjust the fertilizer application rate.

Therefore, in consideration of the time loss from when the speed adjustment stop command is actually output until the speed adjustment is actually stopped, the speed adjustment is stopped at a stage slightly before reaching the target rotation speed. However, if the target speed of the fertilizer pump is changed to adjust the fertilizer application amount or to increase or decrease the working speed, the speed will be set at the front side of the target speed or at the speed exceeding the target speed. Since the adjustment is stopped, the fertilizer application amount cannot be adjusted with high accuracy, and further improvement is required.

[Means for Solving the Problem] The present invention has been made in view of the above circumstances, and was devised with the object of providing a rotation speed adjusting device for a drive mechanism in a mobile agricultural machine capable of eliminating these drawbacks. A fertilizer applicator including a rotation speed adjusting mechanism for adjusting the rotation speed based on an adjustment command from the rotation speed control unit of the drive mechanism in a power transmission path for driving the drive mechanism such as a pump. , A rotation speed detection unit for detecting the actual rotation speed of the drive mechanism is connected to the rotation speed control unit,
The rotation speed control unit compares target rotation speed setting means for setting a target rotation speed with a value of the set rotation speed target value and the detected rotation speed detection value, and the comparison difference value. The multi-stage judgment is made as to which of a plurality of setting difference values of different magnitudes is preset, and the higher the comparison difference value is, the faster the adjustment command is sent to the rotation speed adjustment mechanism. It is characterized in that an adjustment command determining means for outputting the same is provided.

Further, according to the present invention, when the work amount such as the fertilizer application amount and the seeding amount is adjusted by the rotation speed control of the drive mechanism, the present invention enables the rotation speed control without the hunting phenomenon. It is a thing.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of a riding type fertilizer applicator, and a fertilizer section 2 is provided at the rear of the traveling machine body 1 so as to be vertically movable by an elevating link mechanism 3. And this fertilizer part 2
Is provided with a fertilizer nozzle 6 connected to the tip of a hose 5 extending from the fertilizer pump 4.

The fertilizer section 2 is provided with a grounding wheel 7 that travels on the rice field, and lugs 7a are provided on both left and right edges of the outer peripheral surface of the grounding wheel 7.
Are attached in a left and right puddle shape at a predetermined interval so that slips on the rice field can be avoided. A boss shaft 7b of the grounding wheel 7 is rotatably supported by a frame 8 integrally fixed to a supporting member 2a extending from the fertilizer application side via bolts 2b. On the other hand, the frame 8 is provided with a rotation sensor 9 for detecting the number of rotations. The sensor width 9a of the rotation sensor 9 is integrally connected to a gear shaft 10a rotatably provided on the frame 8. Has been done.
The small gear 10 of the gear shaft 10a meshes with the large gear 11 fixed to the boss shaft 7b, so that the rotation of the ground wheel 7 is transmitted to the ground wheel rotation sensor 9 in a state of being accelerated and detected. It is becoming like this. Reference numeral 12 is a protective frame for the ground wheel rotation sensor 9.

On the other hand, the fertilizing pump 4 receives the driving force from the engine (not shown) side from the power take-out shaft (PTO shaft) 13 of the traveling machine body 1 via the stepless rotation speed adjusting mechanism 14. However, the rotation speed adjusting mechanism 14 is as follows. That is, although the split pulley 16 is provided on the input shaft 15 of the rotation speed adjusting mechanism 14, the half pulley 16 of the split pulley 16 is provided.
A cam mechanism 17 is provided in a. By operating the cam mechanism 17 by driving the motor 27 forward and backward, the half pulley 16a is displaced in the axial direction with respect to the other half pulley 16b so that the pulley diameter can be adjusted. The input shaft 15 is provided with an input shaft rotation sensor 18 and a potentiometer 19, respectively. The output shaft 20 that is linked to the fertilizer pump 4 is provided with a driven side split pulley 21, and the output shaft 20 is provided with an output shaft rotation sensor 22. And each of these sensors 9, 1
8, 22, potentiometer 19, and signals from fertilizer application rate setting device 25 provided on control panel 24 arranged in front of driver's seat 23 are input to control unit 26 configured by using a micro computer. ing. Then, the control unit 26 outputs a control command to the motor 27 based on these input data, as described later, and controls the rotation speed of the pump to control the fertilizer application amount.

An example of the system procedure of the fertilizer application control will be described with reference to the flow chart of FIG. First, when the system is started, whether the fertilizer application control is switched to the automatic state, that is, whether the automatic fertilizer application switch 28 is ON (OFF)
Is determined. Then, if it is determined to be OFF and NO is determined, the control shifts to the manual control as it is, but if YES is determined to be ON, the fertilizer application setting device 25 The vehicle speed detection value V is read from the set value N and the rotation speed of the ground wheel rotation sensor 9, and based on these values N and V, the target value M of the rotation speed of the fertilizer pump 4 (this target value M is of course the output shaft 20). Of the fertilizer application pump 4 is calculated, and the current rotational speed of the fertilizer application pump 4 is read based on the detected value L from the output shaft rotary sesain 22. The detected value L is the target value M
Is determined to be equal (M = L), and YE
When the determination of S is made, a stop command is issued to the motor 27.

On the other hand, when the determination is NO because they are not equal, it is determined whether the target value M is smaller than the detection value L (M <L). When the determination is YES because the target value M is small (that is, when the fertilizer application amount is too large), the difference Y (calculated by LM = Y) is preset for the target value M. It is determined whether or not it is less than or equal to the first ratio value n (for example, a value of 3% with respect to the target value M), and if YES is determined as being less than, it is determined by the small first inching mode. A drive command is issued to the motor 27
Is driven at a low speed so that the detected value L is controlled to approach the target value M. On the other hand, when the difference Y is larger than the first ratio value n with respect to the target value M, NO is determined,
Next, a second proportion value m (n <n
m, and it is determined whether or not m is, for example, 10% or less of the target value M). Then, if YES is determined as being equal to or less than the second ratio value m, a drive command in the second inching mode, which is larger than the first inching mode, is issued to the motor 27, and the motor 27 is at the medium speed and the target value M. Is controlled to the side. If NO is determined as being larger than the second ratio value m, a drive command in the continuous mode is issued to the motor 27, and the motor 27 is driven and controlled at the high speed to the target value M side. When the amount is too large, the rotation speed of the fertilizer application pump 4 is controlled.

On the other hand, when NO is determined because the target value M is larger than the detection value L, the difference X (calculated by ML = X) is calculated, and the difference X is as described above. By the comparison and determination control based on the first ratio value n and the second ratio value m, similarly to the above, the rotational speed control is performed such that the further the difference X is from the target value M, the higher the speed, and the closer the difference X, the lower the speed. It is becoming like this.

In the embodiment of the present invention configured as described above, the fertilizer application amount is automatically controlled by the control of the rotation speed adjusting mechanism 14 based on the traveling speed and the set value as described above. When the actual amount of fertilizer applied by the fertilizer pump 4 is different from the target amount of fertilizer applied, and when the pump rotation speed is adjusted, as described above, when the difference is large, it is high speed, and when it is medium, it is medium. Multi-stage adjustment control of the pump rotation speed is performed such that the speed is low, and the speed is low when the speed is small. Therefore, in this product, the fertilizer application amount is adjusted at a low speed as the fertilizer application amount approaches the target value, and the adjustment control is stopped at the target rotation speed, and the adjustment amount exceeds the conventional value. It is possible to surely avoid a problem such as running and causing a hunting phenomenon, and it is possible to perform swift yet stable and highly accurate fertilizer application amount adjustment.

In addition, since the traveling speed of the aircraft is detected by the grounding wheel 7 with a lug, this type has a small error due to slippage, and the speedup of the rotation of the grounding wheel 7 is detected. Since it is built in the grounding wheel 7, there is an advantage that the structure is simplified.

Needless to say, the present invention is not limited to the above-described embodiment, and the change in the rotational speed adjustment speed does not have to be in three steps as in the embodiment, but may be changed in two steps, four steps, etc. as necessary. Can be set to.

The method of fertilization may be continuous fertilization or intermittent fertilization, but in the case of intermittent fertilization, the seedling pits to be planted in the field may be detected, for example, by light detection. It is also possible to detect using 29 and set fertilization (additional fertilization) based on this, but in this case, the fertilization pitch is 2: 1 or 1: 2 instead of 1: 1 for seedling pitch. The fertilizer can be adjusted and fertilized as described above. The system will be described with reference to the flow chart of FIG. 9. In the state where the system is started, the set fertilizer pitch setting value Q is read by the fertilizer application pitch setter 30, and the fertilizing operation is started. become. Here, it is determined whether or not the seedling detection pitch by the seedling detection sensor 29 is n, and if it is not n, NO
If it is determined that the seedling detection pitch is m, it is determined whether the seedling pitch is m. Next, a case where the detected seedling pitch is n will be described as an example. That is, if YES is determined assuming that the seedling detection pitch is n, the rotation speed adjusting mechanism 14 is operated and controlled so that the fertilization pitch becomes Q × n. Then, the detection pitch R by the fertilization pitch detection sensor 31 provided in the fertilizer nozzle is Q × n.
Is determined (R = Q × n), and Q × n
If it is not, the feed back control is performed to control to Q × n, and if it is, it is judged whether to continue the work as it is. In this way, the intermittent fertilization corresponding to the seedling pitch is performed. It will be possible.

[Effects] In summary, since the present invention is configured as described above, the rotational speed of the drive mechanism, which is the drive source for operations such as fertilization and sowing, has a large difference from the target rotational speed. In some cases, the speed of the rotational speed is adjusted in multiple stages such that the speed is high, and the speed becomes slower as the difference becomes smaller. As a result, unlike the conventional one in which the speed is adjusted in the same state until the number of rotations of the drive mechanism reaches the target number of rotations, the so-called hunting phenomenon does not occur due to overrun. There is also a problem that the speed adjustment will stop at the front side of the target speed or at the speed exceeding the target speed when adjusting the speed, like the one that stops speed adjustment early in anticipation of this overrun. Whatever target speed is set, the speed of the drive speed corresponding to this can be adjusted, and the speed can be surely avoided when the target speed is reached. The adjustment can be stopped, and the speed adjustment control of the drive mechanism can be performed quickly and with high accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a rotation speed adjusting device for a drive mechanism in a mobile agricultural machine according to the present invention. FIG. 1 is an overall side view of a fertilizer applicator, and FIG. Fig. 3 is a rear view of the fertilizer application part, Fig. 3 is a side view of the grounding wheel, Fig. 4 is a rear view of the grounding wheel, Fig. 5 is a sectional view of a main part of the grounding wheel, Fig. 6 is a schematic view of a control mechanism, and 7 The figures are block circuit diagrams of the control mechanism, and FIGS. 8 and 9 are flow charts of the control system. In the figure, 2 is a fertilizer unit, 4 is a fertilizer pump, 14 is a rotation speed adjusting mechanism, 26 is a control unit, and 27 is a motor.

Front page continuation (72) Inventor Masahiko Inoue 667 Isuyacho, Higashi Izumo-cho, Yatsuka-gun, Shimane Prefecture 1 Inside Mitsubishi Agricultural Machinery Co., Ltd. (56) Reference JP-A-57-194711 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A rotation speed adjusting mechanism for adjusting the rotation speed based on an adjustment command from a rotation speed control section of the driving mechanism is interposed in a power transmission path for driving a driving mechanism such as a pump. In the mobile agricultural machine, a rotation speed detection unit that detects the actual rotation speed of the drive mechanism is connected to the rotation speed control unit, and the rotation speed control unit includes a target rotation speed setting unit that sets a target rotation speed. , Comparing the set rotational speed target value with the detected rotational speed detection value, and setting the comparison difference value to a plurality of preset difference values of different magnitudes which are set in advance. A drive mechanism in a mobile agricultural machine, which is provided with an adjustment command determination means for making a determination and outputting a high speed side adjustment command to the rotation speed adjustment mechanism as the comparison difference value is larger. Rotation speed adjustment device.