JP3746114B2 - Fertilizer spreader - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fertilizer spreader that spreads fertilizer on a field and can adjust the amount of fertilizer spread.
[0002]
[Prior art]
In general, a fertilizer spreader that spreads granular or powdered fertilizer on a field is connected to a rear portion of a tractor, etc., stores a fertilizer and supplies the fertilizer downward, a frame for supporting the hopper, and the above A spraying device for spraying fertilizer at the lower part of the hopper is provided, and the fertilizer is sprayed backward by this spraying device.
[0003]
When spraying fertilizer, it is necessary to adjust the amount of fertilizer sprayed according to the soil quality of the field, etc., but this fertilizer spray amount adjusting device has been filed by the present applicant and disclosed in Japanese Patent Application Laid-Open No. 5-236913. There is something shown in.
[0004]
As shown in FIGS. 7 and 8, this fertilizer spreader has a hopper 151 for reducing the diameter from the top toward the bottom and storing the fertilizer inside, and a frame that supports the hopper 151 so as to be sandwiched from the outside of the inclined portion of the hopper 151. 152 is provided. Below the hopper 151, a spraying device (not shown) provided with a rotating plate (not shown) is provided. The bottom surface of the hopper 151 is provided with a plurality of holes 153 for supplying fertilizer to the spraying device, and has spraying holes 154 in contact with the bottom side of the hopper 151 and corresponding to the holes 153 of the hopper 151. A disc-shaped shutter body 155 is rotatably provided. The amount of fertilizer sprayed is adjusted by rotating the shutter body 155 and increasing / decreasing the area of the drop port 159 formed by superposing the hole 153 and the spraying hole 154 of the hopper 151.
[0005]
A swing link 157 is provided on the frame 152 via a bracket 156 and a pin 158 so as to be rotatable in the horizontal direction around the center. Slots 161a and 161b are formed at both ends of the swing link 157. One end of the swing link 157 on the hopper 151 side is provided with a pin 163 on a bracket 162 provided to extend from the outer periphery of the shutter body 155. Are connected through. An electric cylinder 164 and a magnetic sensor 165 are attached in parallel to each other on the other end side of the swing link 157, and pins 171 and 172 attached to the tips of the forward and backward rods 166 and 167 that advance and retract in the longitudinal direction, respectively. Is inserted into the elongated hole 161b and connected to the other end of the swing link 157.
[0006]
Eight magnetic detection elements 168 are arranged in the longitudinal direction inside the magnetic sensor 165, and a permanent magnet 173 is attached to the advance / retreat rod 167 inserted therein. A control box 174 connected to the electric cylinder 164 and the magnetic sensor 165 is provided on the driver seat side of the tractor. The control box 174 includes eight control boxes 174 corresponding to the number of the magnetic detection elements 168. A switch button 175 and a control device (not shown) for appropriately operating the electric cylinder 164 according to the detected value from the magnetic sensor 165 and the set value of the switch button 175 are provided.
[0007]
In order to spread fertilizer using this fertilizer spreader, the switch button 175 corresponding to the desired spread amount is pushed. As a result, the magnetic detection element 168 corresponding to the switch button 175 is magnetized, and the advance / retreat rod 166 of the electric cylinder 164 is extended or retracted. The rocking link 157 moves the forward / backward rod 167 of the magnetic sensor 165 together with the forward / backward rod 166 of the electric cylinder 164, and the permanent magnet 173 provided on the forward / backward rod 167 is positioned at the magnetized magnetic detection element 168. When this happens, the electric cylinder 164 is stopped by the control device (not shown) of the control box 174.
[0008]
That is, when the electric cylinder 164 advances and retracts and stops at a predetermined position, the swing link 157 is rotated around the pin 158, and the shutter body 155 connected to one end thereof rotates and stops at the predetermined position. In other words, the area of the drop port 159 formed by superposing the hopper hole 153 and the spray hole 154 is determined, and the spray amount of the fertilizer supplied to the spray device can be adjusted.
[0009]
[Problems to be solved by the invention]
In the above-described fertilizer spreader, the opening determined by the area of the drop port 159 is divided into eight stages, but the opening may need to be divided more finely depending on the state of the field and fertilizer. In this case, the magnetic detection element 168 in the magnetic sensor 165 has to be added, and the magnetic sensor 165 becomes large, so that attachment to the frame 152 becomes difficult. Further, in order to make precise adjustments, as many signal lines as the number of magnetic detection elements 168 are required between the magnetic sensor 165 and the control box 174. This increases the labor and cost of assembly.
[0010]
[Means for Solving the Problems]
  In order to solve the above-mentioned problems, the present invention provides a hopper that stores fertilizer to be spread.For spreading fertilizer fromIn the fertilizer spreader,A hopper provided on the frame body, a feeding plate that is fitted to the lower end portion of the hopper so as to define the bottom portion of the hopper, and is rotatably provided around the center of the bottom portion of the hopper, and the feeding thereof A shutter body pivotally supported at the lower part of the plate, a drop opening formed by a feeding hole formed in the feeding plate and a flow rate adjusting hole formed in the shutter body, and an opening adjustable, and connected to the shutter body AndAn opening degree adjusting means for adjusting the opening degree of the drop opening, an angle detecting means for detecting a movement amount of the shutter body as a rotation angle of the detection shaft, and the opening degree adjustment based on a detection value of the angle detecting means. Drive control means for driving the means to control to a desired opening degreeAndPreparationThe spraying device receives a fertilizer falling from the dropping port, and rotates to disperse the fertilizer laterally and rearward by centrifugal force, and a plurality of spraying blades extending radially to the disc. And a handle for adjusting the rotational position of the feeding plate on the feeding plate in order to adjust the position of the dropping port.Is.
[0011]
  Also,The hopper is provided to be rotatable up and down with respect to the frame body so as to open the feeding plate.Is desirable
[0012]
  further,The angle detection means includes a link mechanism that connects a shaft fixed to the shutter body and the detection shaft, and a displacement detector that measures a rotation angle of the detection shaft,It is preferable that the opening degree adjusting means includes an electric cylinder that is expanded and contracted by the drive control means, and a lever that transmits expansion and contraction of the electric cylinder to the detection shaft.
[0013]
Then, the drive control means compares the set value for setting the opening degree of the drop port with the set value by the set means and the detected value, and the drive signal is sent to the opening degree adjusting means so that they match. Is preferably provided with a comparison processing unit that outputs.
[0014]
  According to the above configuration, the opening of the drop port isRotation amountIs detected as a rotation angle by the angle detection means, and the opening degree adjustment means is operated by the drive control means, so that the fertilizer application amount can be finely and precisely adjusted without increasing the size of the apparatus main body.Furthermore, since the spreading | diffusion apparatus provided with the rotatable spreading plate in the lower part of the hopper was provided, the fertilizer can be spread | distributed over the wide range of a side and back.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0016]
FIG. 1 is a plan view showing a broadcaster as a fertilizer spreader according to the present invention, and FIG. 2 is a left side view thereof.
[0017]
As shown in the figure, the fertilizer spreader 1 accommodates the granular or powdered fertilizer to be dispersed and a feeding plate 15 having a feeding hole 3 of a predetermined size is fixed to the bottom thereof, and from the feeding hole 3. A hopper 2 that feeds the fertilizer downward, a frame body 8 that supports the hopper 2, and a spray plate 4 that is positioned below the hopper 2 and is rotatably provided, and the fertilizer fed from the hopper 2 is sprayed backward. And a shutter provided with a flow rate adjusting hole 6 formed in the same shape and position as the feeding hole 3 of the hopper 2 and in contact with the lower side of the bottom of the hopper 2 so as to be rotatable about a rotation axis. And a body 7. The feeding plate 15 and the shutter body 7 constitute an opening / closing means 9 that appropriately opens and closes the dropping port 11 where the feeding hole 3 and the flow rate adjusting hole 6 overlap. The shutter body 7 as the opening / closing means 9. Is rotated to increase / decrease the area of the drop opening 11, increase / decrease the amount of fertilizer fed to the spraying device 5, and adjust the spraying amount. The shutter body 7 is connected to and provided with opening degree adjusting means 12 for adjusting the opening degree by rotating the shutter body 7 to increase or decrease the opening amount of the dropping port 11 so as to adjust the fertilizer application amount. Further, the angle detecting means 63 for detecting the rotational movement amount of the shutter body 7 as the rotation angle of the detection shaft interlocking with the rotation of the shutter body 7, and the opening degree adjusting means 12 based on the detection value of the angle detecting means 63. And drive control means 65 for controlling the desired opening degree.
[0018]
The hopper 2 has a circular cross section and is formed so as to reduce in diameter from the upper part toward the lower part. The upper end part is formed with an opening 14 in which a part of the circumference is linearly formed, and the lower end part. A circular feeding plate 15 is fixed to the part. The feeding plate 15 has a rising portion 56 formed on the outer peripheral surface, and a lower end portion of the hopper 2 is fitted inside the rising portion 56 (see FIG. 4). Moreover, the flange 57 extended outside is formed in the upper end part of the rising part 56 (refer FIG. 4). The feed plate 15 has a feed hole 3a formed horizontally along the circumference, a substantially circular feed hole 3b formed inside the feed hole 3a, and beside the feed holes 3a and 3b. A feed hole 3c that is positioned in a substantially circular shape and is partially formed horizontally along the circumference, and a circular shaft hole 13 formed in the central portion are provided.
[0019]
Further, a stepped portion 17 into which an annular support frame 16 that is a part of the frame body 8 is fitted is formed in an annular shape slightly below the upper end opening 14 of the hopper 2.
[0020]
The frame body 8 includes a horizontal rod 21 having an L-shaped bracket 19 provided with a through-hole 18 fixed to the rear end (right side in FIGS. 1 and 2), and a front of the horizontal rod 21 (FIGS. 1 and 2). A pair of left and right side frames 23 a and 23 b are formed, which are formed with a vertical rod 22 fixed to the lower part of the middle left side), and these side frames 23 a and 23 b are formed in a cylindrical shape provided on the upper portion of each vertical rod 22. Are connected by a connecting plate 25 having a U-shaped cross section provided below. A top mast 26 that extends forward and upward and is connected to a top link of a tractor (not shown) is provided at the center of the horizontal bar 24, and extends to the front at the lower end of the vertical bar 22 and is connected to a lower link of a tractor (not shown). A pair of brackets 27 are provided and are supported by the tractor.
[0021]
A hole 28 is formed in the middle upper portion of the top mast 26. On the other hand, a first support rod 31 is provided which is connected to the lower portion of the front end of the support frame 16 that supports the hopper 2 and connects and fixes the top mast 26 and the support frame 16 together. The first support rod 31 has a plate member 32 bent at the upper part forward and a lower part bent backward, and a locking member 34 fixed to the lower surface of the lower bent part of the plate member 32 and having a through hole 33 formed therein. It consists of and. The support frame 16 is placed and fixed on the upper surface of the upper bent portion of the plate member 32, and a pin is inserted into the hole 28 of the top mast 26 and the through hole 33 of the locking member 34, so that the top mast 26 and the support frame 16 are connected. It is fixed.
[0022]
The bracket 19 provided behind the horizontal rod 21 is provided with a pair of second support rods 35 for connecting and fixing the pair of horizontal rods 21 and the support frame 16. The second support rod 35 includes a side plate member 36a having a horizontally extending shaft 36b fixed to one side, one end fixed to the back side of the side plate member's shaft 36b fixed surface, and the other end obliquely upward and outward. And the upper plate 38 fixed to the upper end of the inclined rod 37 and formed in the horizontal direction. The support frame 16 is placed and fixed on the upper surface of the upper plate member 38, and the shaft 36b of the side plate member 36a is inserted into the through hole 18 of the bracket 19 and is rotatably connected. Thus, by removing the pin of the first support rod 31, the support frame 16 and the hopper 2 can be rotated rearward around the shaft 36b (indicated by a one-dot chain line in FIG. 2).
[0023]
In addition, brackets 58 extending toward the flange 57 of the rising portion 56 of the feeding plate 15 are formed inside the pair of horizontal rods 21, respectively. The left and right ends of the flange 57 have a predetermined length in the circumferential direction. Bolts 50 and the like are inserted into the elongated holes 57a formed so as to be fixed and supported from both sides. Thereby, the feeding plate 15 can be attached while being shifted in the circumferential direction within the range of the length of the long hole 57a, and the position of the feeding hole 3 can be appropriately shifted.
[0024]
By the way, grounding rods 41a and 41b extending rearward are fixed to the lower part of the side frame 23, and a mounting plate for placing a mission 43 (to be described later) between the grounding rods 41a and 41b. 44 is erected.
[0025]
The spraying device 5 includes a mission 43 that converts a rotational force from a tractor drive source (not shown) upward, and a spray plate 4 that is rotated by the rotational force from the mission 43 and sprays fertilizer backward. Yes.
[0026]
The mission 43 is provided with an input shaft 47 connected to the drive source of the tractor extending forward from the mission case 46. In the transmission case 46, it is connected to an output shaft 48 that extends upward through a pebble gear (not shown). The mission case 46 is placed and fixed on the placing plate 44 between the grounding rods 41a and 41b, and the input shaft 47 is inserted into a hole (not shown) formed in the middle of the connecting plate 25 between the pair of vertical rods 22. The bearing is supported.
[0027]
The spreading plate 4 includes a disc 52 positioned above the mission 43 and having a boss portion 51 as a center, and four spreading blades 53 formed on the upper surface of the disc 52 and extending in the radial direction. Further, a wall body 55 having a wall surface 54 formed along a part of the front of the circumferential portion of the disc 52 is formed in front of the spraying blade 53 to prevent the fertilizer from scattering to the tractor side. . The spreading blade 53 is formed in a substantially U-shaped cross section, the lower surface portion 53a and the upper surface portion 53b are oriented in the rotational direction, the lower surface portion 53a is wider than the upper surface portion 53b, and the lower surface portion 53a is centered. It gets wider as you get closer to.
[0028]
The output shaft 48 of the mission 43 is fitted to the boss portion 51, and the disc 52 and the spray vane 53 rotate clockwise when viewed from above around the output shaft 48, and the fertilizer sent out from the dropping port 11. Are scattered to the side and rear. The output shaft 48 is formed at a coaxial position below the feeding plate 15 of the hopper 2 and the central axis of the shutter body 7.
[0029]
The amount of fertilizer sprayed depends on the rotational speed of the disc 52, the length of the spraying blade 53, and the mounting angle, but the shape and position of the feeding holes 3a, 3b, 3c of the present embodiment are empirically determined. The obtained shape and position are not limited to the above-described shape and position. Since the spreading blade 53 rotates in the clockwise direction, the fertilizer sent from the feed hole 3a is directed to the left of the tractor, the fertilizer sent from the feed hole 3b is moved to the rear of the tractor, and the fertilizer sent from the feed hole 3c is It will be spread evenly to the right of the tractor. In addition, due to the shape described above, the amount of fertilizer sprayed from the feed holes 3a, 3b, and 3c increases as the rotation of the shutter body 7 increases. That is, when a small amount of fertilizer is sprayed, the degree of increase in fertilizer with respect to the rotation angle is small, and the spray amount can be adjusted more finely.
[0030]
The shutter body 7 is formed in a disc shape with the same diameter as the feeding plate 15, and flow rate adjusting holes 6 a, 6 b, 6 c are formed in the same shape and position as the feeding holes 3 a, 3 b, 3 c of the hopper 2. A shaft hole 60 larger than the shaft hole 13 of the feeding plate 15 is formed at the center.
[0031]
The shutter body 7 is disposed directly below the feeding plate 15, and a support body 59 that supports the shutter body 7 is fitted and fixed in the shaft hole 13 of the feeding plate 15 as shown in FIG. 4. The support body 59 is formed in a columnar shape, and its upper end is formed to have a thickness slightly smaller than the diameter of the shaft hole 13 and the thickness of the feeding plate 15, and its lower part is slightly smaller than the diameter of the shaft hole 60 of the shutter body 7. The diameter is increased to a small diameter and formed slightly thicker than the thickness of the shutter body 7, and the lower lower end is further expanded to support the shutter body 7, and the stepped portion 61 is formed along the outer peripheral surface. Yes. The support body 59 is inserted into the shaft hole 60 of the shutter body 7, and the shutter body 7 is placed on the stepped portion 61, and the upper portion of the support body 59 is fitted into the shaft hole 13 of the feeding plate 15 and fixed by bolts or the like. . That is, the support body 59 is fixed to the feeding plate 15, and the shutter body 7 is rotatably supported around the support body 59 as a central axis.
[0032]
Moreover, the hanging part 62 is formed in the outer peripheral part of the shutter body 7, and it prevents that the fertilizer is scattered from the spreading apparatus 5 side to the upper apparatus side.
[0033]
A handle 79 extending rearward is provided at the rear portion of the flange 57 of the feeding plate 15.
[0034]
The angle detection means 63 includes a support body (rotating shaft) 59 that is an axis of the shutter body 7 and a fulcrum shaft (detection shaft) 69 of a bent portion of the bell crank 70 attached to the horizontal shaft 24 in front of the hopper 2. It consists of a link mechanism 71 to be connected and a displacement detector 72 attached to the fulcrum shaft 69 for detecting the rotation angle of the shaft.
[0035]
As shown in FIG. 3, the fulcrum shaft 69 is attached to the rear side of the center portion of the horizontal cage 24 via a bracket 67 and a bearing 68. The bracket 67 is formed so as to extend in the vertical direction, and a bearing 68 having a vertical shaft hole 73 is fixed to the rear of the lower end thereof, and a fulcrum shaft 69 is rotatably inserted into the shaft hole 73. The upper end of the hole 73 is supported by the ring 74 to prevent it from being removed. The long side arm 70a of the bell crank 70 extends to the right side (upper side in FIG. 1), and a connecting rod 76 extending to the rear support body 59 side is connected to the tip of the bell crank 70 via a pin 75. Further, the hanging part 62 of the shutter body 7 is provided with a connecting plate 77 which is fixed to the right side and extends sideways, and the rear end part of the connecting rod 76 is connected to the tip thereof via a pin 78. Yes. The long side arm 70a, the connecting rod 76, and the connecting plate 77 constitute a link mechanism 71. Here, the distance L between the center of the support 59 and the pin 78₁And the distance L between the fulcrum shaft 69 and the pin 75₂Are formed so as to form a parallelogram when the center of the support body 59, the pin 78, the fulcrum shaft 69, and the pin 75 are connected, and the ratio between the rotation angle of the support body 59 and the rotation angle of the fulcrum shaft 69. The link mechanism 71 is a parallel link so that is 1: 1.
[0036]
The displacement detector 72 includes a core rod 83 that is rotatably supported by an upper plate 81 extending rearward from the upper end of the bracket 67 and is integrally fixed to a fulcrum shaft 69 by a fixture such as a screw 82. A variable resistor 84 is fixed to the upper part of the upper plate 81. The displacement detector 72 changes the resistance value inside the variable resistor 84 when the core 83 rotates, and outputs a change in output voltage based on the change in resistance value as a signal. The output voltage from the displacement detector 72 is set to increase when the core rod 83 of the detector 72 rotates clockwise.
[0037]
The opening degree adjusting means 12 includes an electric cylinder 85 that is expanded and contracted by the drive control means 65, and a short side arm 70b of a bell crank 70 that is a lever that transmits the expansion and contraction of the electric cylinder 85 to a fulcrum shaft (detection shaft) 69. It consists of and. The electric cylinder 85 is pivotally supported via a pin 87 on a bracket 86 whose base end is attached to the lower portion of the horizontal rod 21 of the left frame 23a, and the tip of the piston rod 88 is the short side arm of the bell crank 70. It is pivotally supported via a pin 89 at the tip of 70b. In addition, the electric cylinder 85 is provided with a signal processing unit 80 that processes the drive signal output from the drive control means 65. In addition, the short side arm 70b and the long side arm 70a are integrated by welding, and the bell crank 70 is formed.
[0038]
The drive control means 65 is arranged in a control box 91 provided on the driver's seat side of the tractor and sets a fertilizer application amount, and a set value V from the setter 92₁And the detected value V from the displacement detector 72₂And a comparison processing unit 95 that outputs a drive signal to the opening degree adjusting means 12 so as to match with each other.
[0039]
As shown in FIGS. 5 and 6, the setting device 92 includes a rotating core rod 96. When the core rod 96 rotates, the resistance value inside the setting device 92 changes according to the rotation angle. , The change in the output voltage based on the change in the resistance value is the set value V₁Is output as In the present embodiment, a dial 97 is fixed to the core rod 96, and a scale 90 is provided around the core rod 96. When the dial 97 rotates clockwise, the output voltage from the setting device 92 increases. Is set. That is, the setting device 92 is a dial type, and by rotating it clockwise from the position on the left side where the drop port 11 is closed, the output voltage gradually increases and the set value V₁Is changing continuously.
[0040]
The comparison processor 95 sets the set value V from the setter 92.₁And the detected value V from the displacement detector 72₂And a control unit 94 that is connected to the comparison unit 93 and controls the expansion / contraction direction and the expansion / contraction length of the electric cylinder 85.
[0041]
The comparison unit 93 sets the set value V corresponding to the position indicated by the dial 97 of the setter 92 corresponding to a predetermined fertilizer application amount.₁Rotation angle detection value V of the fulcrum shaft (detection shaft) 69 of the bell crank 70 of the angle detection means 63₂Are compared. Then, a control unit 94 is connected to the comparison unit 93, and the set value V of the setter 92 is set.₁And the detection value V of the angle detection means 63₂The electric cylinder 85 is expanded and contracted toward the side where the₁And detected value V₂The electric cylinder 85 is adapted to stop when is matched.
[0042]
The control box 91 is provided with operation display lamps 98a and 98b. The operation display lamp 98a is turned on when the electric cylinder 85 is extended, and the operation display lamp 98b is turned on when the electric cylinder 85 is retracted.
[0043]
Further, a wiring 110 consisting of three lines is provided between the displacement detector 72 and the control box 91, and between the control box 91 and the electric cylinder 85 and a battery 99 which is a power source of the control box 91 and the tractor. A wiring 111 composed of two lines is provided between the two.
[0044]
In FIG. 5, 100 is a connector, 101 is a fuse, and 102 is a power switch.
[0045]
An effect | action is demonstrated along operation of the manure spreader 1 by the above structure.
[0046]
First, the power switch 102 of the control box 91 is turned on. At this time, the dial 97 of the setting device 92 is set to the closed position. Next, the dial 97 is rotated to the position of the scale 90 where a desired application amount can be obtained. Then, the voltage corresponding to the amount of rotation of the core rod 97 is set from the setting device 92 to the comparison unit 93 by the set value V.₁Is output as Then, the comparison unit 93 receives the voltage signal (detection value V from the displacement detector 72).₂) And a voltage signal (set value V) from the setter 92₁) And the voltage difference (V₁-V₂) Is output to the control unit 94. The controller 94 extends the electric cylinder 85 to eliminate this voltage difference. As the piston rod 88 extends, the fulcrum shaft 69 of the bell crank 70 is rotated, and the output voltage of the displacement detector 72 increases or decreases in accordance with the rotation amount, and the detected value V₂To the comparison unit 93. When the voltage signal from the displacement detector 72 and the voltage signal from the setting device 92 match, the control cylinder 94 stops the electric cylinder 85.
[0047]
When the electric cylinder 85 is extended as described above, the shutter body 7 is rotated clockwise through the link mechanism 71, the feeding hole 3 of the feeding plate 15 and the flow rate adjusting hole 6 of the shutter body 7 are overlapped and dropped. A desired opening area of the drop port 11 can be obtained at a position where the mouth 11 is formed and the extension of the electric cylinder 85 is stopped.
[0048]
That is, when the dial 97 of the setting device 92 is rotated clockwise, the electric cylinder 85 is extended, and the shutter body 7 is rotated clockwise via the link mechanism 71, so that the area of the drop port 11 is increased. Further, when the dial 97 is rotated counterclockwise, the electric cylinder 85 is retracted, and the shutter body 7 is rotated counterclockwise via the link mechanism 71, so that the area of the drop port 11 is reduced. Then, when the shutter body 7 rotates and stops rotating at a predetermined position, a desired opening area of the drop port 11 is formed. Note that when the dial 97 is in the closed position of the setting device 92, the drop port 11 is closed.
[0049]
As described above, the rotation angle of the bell crank 70 is defined as the rotation angle of the shutter body 7, where the increase / decrease in the area of the drop port 11, which is a portion where the feeding hole 3 of the feeding plate 15 and the flow rate adjusting hole 6 of the shutter body 7 overlap. , So that the detected value V₂Is subdivided more finely with respect to a predetermined application amount, and the setter 92 is a dial type, so that the set value V₁Can be specified more precisely, and the opening amount of the drop port 11 can be accurately set to a desired area.
[0050]
Further, since the support body 59 that is the rotation shaft of the shutter body 7 and the fulcrum shaft 69 of the bell crank 70 that is the detection shaft are connected by the link mechanism 71 so that the respective rotation angles are equal, the rotation angle is reduced. Since the rotation angle can be detected by the displacement detector 72, the apparatus can be prevented from being enlarged.
[0051]
Further, since the displacement detector 72 outputs a change in the output voltage based on the change in the internal resistance value as a signal, the wiring of the apparatus can be simplified.
[0052]
In the present embodiment, the rotation axis of the shutter body 7 and the detection axis are formed separately, but the angle detection means 63 may be provided on the rotation axis of the shutter body 7.
[0053]
The present invention is not limited to a broadcaster that includes a shutter body 7 that rotates about a rotation axis. For example, a lime saw that slides in a direction perpendicular to the traveling direction to increase or decrease the area of a drop opening. Etc. can also be implemented.
[0054]
【The invention's effect】
In short, according to the present invention, the following excellent effects are exhibited.
[0055]
(1) It is possible to finely divide the opening of the dropping port and precisely adjust the amount of fertilizer sprayed.
[0056]
(2) Since the device of the fertilizer spreader does not become large and the wiring does not become large, assembly is easy and it is possible to prevent an increase in labor and cost.
[Brief description of the drawings]
FIG. 1 is a plan view of a fertilizer spreader according to the present invention.
FIG. 2 is a left side view of the fertilizer spreader according to the present invention.
FIG. 3 is a side sectional view showing angle detection means.
FIG. 4 is a side sectional view showing opening / closing means.
FIG. 5 is a schematic diagram showing wiring of angle detection means, opening degree adjustment means, and drive control means.
FIG. 6 is a block diagram showing drive control means.
FIG. 7 is a plan view showing a conventional fertilizer spreader.
8 is an enlarged view of a main part of FIG.
[Explanation of symbols]
1 Fertilizer spreader
2 Hoppers
7 Shutter body
9 Opening and closing means
11 Falling mouth
12 Opening adjustment means
59 Support (Rotating shaft)
63 Angle detection means
65 Drive control means
69 Support shaft (detection shaft)
70b Short side arm (lever)
71 Link mechanism
72 Displacement detector
85 Electric cylinder
92 Setting device
95 Comparison processing section
V₁  Setting value
V₂  Detected value

Claims (4)

In a fertilizer spreader for spreading fertilizer with a spreading device from a hopper that contains the fertilizer to be spread, the hopper provided on the frame body is fitted to the lower end of the hopper so as to partition the bottom of the hopper Formed on the frame body is a payout plate provided rotatably around the center of the bottom of the hopper, a shutter body pivotally supported at the lower portion of the payout plate, a payout hole formed in the payout plate, and a shutter body A drop opening formed by the flow rate adjustment hole, the opening being adjustable, an opening adjusting means connected to the shutter body for adjusting the opening of the drop opening, and a shaft for detecting the movement amount of the shutter body an angle detection means which detects a rotation angle of, and a drive control means for controlling to a desired opening degree by driving the opening adjustment means based on the detected value of the angle detection unit, the spraying apparatus , Fall from the above drop mouth And a spreading plate composed of a rotating disc and a plurality of spreading blades extending in the radial direction on the disc, and further, A fertilizer spreader characterized in that a handle for adjusting the rotational position of the feeding plate is provided on the feeding plate to adjust the position of the dropping port . The fertilizer spreader according to claim 1 , wherein the hopper is provided so as to be rotatable up and down with respect to the frame body so as to open the feeding plate . The angle detection means includes a link mechanism that connects a shaft fixed to the shutter body and the detection shaft, and a displacement detector that measures a rotation angle of the detection shaft, and the opening degree adjustment means includes: 3. The fertilizer spreader according to claim 1, comprising an electric cylinder that is expanded and contracted by the drive control means, and a lever that transmits the expansion and contraction of the electric cylinder to the detection shaft.   The drive control means compares the set value for setting the opening degree of the drop port, and the set value by the set means and the detected value, and the drive signal is sent to the opening degree adjusting means so that they match. The fertilizer spreader in any one of Claims 1 thru | or 3 provided with the comparison process part which outputs.

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