JP2019122338A - Combine harvester - Google Patents

Abstract

To provide a combine harvester which is a combine harvester 1 provided with a camera 50 for photographing a grain tank 8, and a monitor 30 for displaying images photographed with the camera, and can properly photograph grains with the camera and clearly display them on the monitor even when an imaging distance between grains accumulated in a large-sized grain tank having a large storage amount becomes large.SOLUTION: There are provided: a camera 50 including lens drive devices 50f, 50g and photographing a grain tank 8; and an image controller 51 for operating the lens drive devices on the basis of a storage height 53 of grains in the grain tank, and performing focus adjustment of the camera 50.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a self-eliminating type or general-purpose type combine, and more particularly, to a combine that captures the inside of a gren tank with a camera and displays an image (image, moving image) on a monitor.

  Combine harvesters harvest rice, barley, soybeans, etc. by discharging the harvested grains into a gren tank mounted on an airframe via a grain raising device, and temporarily storing the grains in the gren tank. In addition, when the grain is full in the gren tank, for example, the grain is discharged using a discharge auger in a container or the like provided on a truck bed, and then the harvesting and harvesting operation is resumed.

  And, in this case, the grains stored in the gren tank should be mixed with immature grains together with sizing, and mixed with other materials such as bellflowers, wood shavings, or stones that could not be removed in the threshing sorting process. There is. In addition, when immature grains and foreign matter are mixed in the grain in this way, there is a problem that clogging, drying unevenness, or moisture change after drying occurs in the subsequent drying operation, and removing them with combine as much as possible. Is required.

  Therefore, by photographing the inside of the glen tank with a camera and visually recognizing the photographed image through a monitor, it is possible to easily confirm the deposition status and sorting status of grains in the gren tank, It has been proposed that if there is a problem in the situation or the sorting situation, an appropriate response can be taken promptly (see Patent Document 1). Further, it has been proposed to inspect the condition of grains or the inclusion of foreign matter during harvesting and to control the sorting apparatus so as to eliminate the inclusion of foreign matter according to the inspection result (see Patent Document 2).

JP 2002-335742 A JP, 2013-27341, A

  As described above, in the combine, it is desirable to prevent immature grains and impurities from being mixed with grains that are temporarily stored in a gren tank and finally discharged to a container or the like. Therefore, as in Patent Document 1, the inside of the gren tank is photographed by a camera, the storage state of the grain is confirmed through the monitor, and if there are many immature grains in the grain stored in the gren tank, the operation is stopped It is a useful technique to postpone the work until the appropriate harvest period, and to adjust the sorter properly if there are many contaminants.

  By the way, since the work of discharging grains from the above-mentioned grain tank to a container etc. is performed by interrupting the mowing and harvesting work, in order to improve the work efficiency of combine, the discharge work frequency and discharge time of the above-mentioned grains Need to be reduced. Therefore, generally, the grain storage amount of the grain tank is increased to reduce the discharge operation frequency or to increase the discharge speed.

  However, in order to increase the grain storage volume (volume) of the grain tank, if the grain tank is enlarged, and the inside of the grain tank is to be photographed with a camera, lower grains stored in the bottom of the grain tank, For example, when shooting a high-order grain that is almost full in the gren tank from the upper side, the shooting distance of the camera is, for example, 2 meters to 10 centimeters or less, and the shooting distance (focus range) has a considerable range I understand that.

  In addition, in order to check whether immature grains or impurities are not mixed in the grain stored in the gren tank, a clear image of the grain is necessary, and in Patent Document 1 in which the inside of the gren tank is simply photographed, the grain is The lens may be in focus and a clear image may be obtained when the amount of grain storage becomes any, but only a blurred image can be obtained otherwise, and the presence or absence of contaminants etc. may be checked There is a possibility that it can not be done.

  Therefore, it is also conceivable to use a camera with an autofocus like a digital camera for this measure. However, when shooting with a camera with auto focus during harvesting and harvesting operations, if the focus is on the grains released from the grain-raising device, the floating scraps, etc. and focus adjustment is performed as it is, it is stored in the gren tank. There is a possibility that still grains and the like can not be photographed clearly.

  On the other hand, as in Patent Document 2, when a grain is taken by a camera while being supplied to a mounting plate with a grain thickness reduced by a guide plate, an appropriate focus is set and a clear image is taken based on a shutter switch. be able to. However, when a bypass path including a guide plate or the like is provided to capture a clear image as described above, the imaging device can not be configured inexpensively, and the grain storage amount of the grain tank is inhibited by the imaging device. And there is a risk of Moreover, with this one, it remains doubtful whether it is possible to see a clear image of the grain being slipped off in real time by the image of the display section.

  Therefore, in view of the problems as described above, the present invention is in combination with a camera for photographing the inside of a gren tank and a monitor for displaying an image photographed by the camera, and is not suitable for a large gren tank with a large storage volume. It is an object of the present invention to provide a combine which can properly photograph grains and the like with a camera and display them clearly on a monitor even if the width of the photographing distance with the stored grains is increased.

  In order to solve the above-mentioned problems, the present invention firstly provides a grain tank for storing grains discharged from a threshing part through a grain-raising device, a camera for photographing the grain tank including a lens driving device, and a camera And a video controller for operating the lens drive device to adjust the focus of the camera based on the storage height of the grain in the grain tank.

  Second, according to the present invention, the image controller includes an imaging distance table estimated from the storage height of grains in the grain tank, and provides the lens driving device with a value obtained from the imaging distance table for focusing. Combine with the combine to adjust.

  Thirdly, according to the present invention, when the manual focus command is issued, the video controller corrects the value obtained from the photographing distance table, and applies the correction value to the lens driving device to perform focus adjustment. I will combine it.

  In the fourth aspect of the present invention, the video controller replaces the value obtained from the shooting distance table with a correction value, and sets the combination as focus adjustment thereafter.

  In the fifth aspect of the present invention, the image controller causes the monitor to display the storage amount of grains on the basis of the storage height of grains in the grain tank, and generates a buzzer when grains are full in the grain tank. It is combined with the combine to operate and notify.

  According to the combine of the present invention, a grain tank for storing grains discharged from the threshing part through the grain raising device, a camera for photographing the inside of the grain tank with the lens driving device, and an image photographed by the camera are displayed And a video controller that operates the lens drive device to adjust the focus of the camera based on the storage height of grains in the grain tank, so that it is stored as a large grain tank with a large storage volume. Even if the width of the shooting distance with the grain is large, the grain etc. can be photographed properly with a focus-adjusted camera and this can be clearly displayed on the monitor.

  In addition, since the camera adjusts the focus based on the storage height of the grain in the grain tank, for example, as in the case of photographing with a digital camera, the focus is on the grain released from the grain-raising device or the floating scale etc. Therefore, stationary grains and the like can be focused and photographed clearly without causing a problem that stationary grains and the like stored in the grain tank can not be clearly photographed.

  Moreover, infrared rays or ultrasonic waves are emitted for focus adjustment, and the shooting distance is detected based on the time or irradiation angle until the reflected wave returns, or the shooting distance is detected using the phase difference detection method or the contrast detection method. There is no need to provide a special bypass path as in the prior art document to reduce the grain storage amount of the grain tank, and the grain image system such as grain is constructed relatively easily and inexpensively. be able to.

  Furthermore, the grain-raising device does not discharge the grain into the gren tank evenly, and the grain discharged by the grain-raising device is, for example, gradually lumped around the middle of the gren tank while making lumps. It crumbles and deposits. Therefore, the grain storage height is not uniform within the grain tank, and the shooting distance also changes depending on the location to be focused. Therefore, it does not make much sense to simply calculate and calculate the photographing distance between the grain and the camera and the storage height of the grain.

  Therefore, the video controller is provided with a shooting distance table estimated from the storage height of grains in the grain tank, and when the value obtained from the shooting distance table is given to the lens driving device to perform focus adjustment, it is actually performed. The grain etc. can be photographed at the designated photographing distance, and a clear image can be displayed on the monitor.

  That is, for example, when the storage distance of the grain is configured by the grain detection sensor, when the grain detection sensor detects the grain in advance, the photographing distance table includes the subject (grain or the like) and the camera. Measure and create the shooting distance between Then, when each grain detection sensor detects a grain in an actual operation, if the photographing distance is estimated with reference to the photographing distance table, it is possible to photograph the subject at the photographing distance which is actually matched.

  In addition, when a manual focus command is issued, the video controller corrects the value obtained from the shooting distance table, gives this correction value to the lens drive device, and performs focus adjustment, the operator manually The focus can be adjusted. That is, the grain accumulation state of the grain tank changes according to cutting conditions, material conditions, and the like, and the photographing distance between the subject and the camera slightly changes even when each grain detection sensor detects grains.

  Therefore, when the operator feels that the focus is sweet based on the image displayed on the monitor, a clear image without blur can be obtained by adjusting the focus by manual operation. Also, when the image controller replaces the value obtained from the shooting distance table with the correction value and performs the focus adjustment thereafter, when the grain is full and the work is discharged after being discharged to the container etc, the previous time, The focus adjustment is performed based on the value manually adjusted by the worker of the operator, and the worker can view clear images without manually adjusting the focus again.

  In addition, the video controller causes the monitor to display the storage amount of grain based on the storage height of grain in the gren tank, and operates the buzzer to notify when the grain is full in the gren tank, and the camera The focus adjustment information, the kernel storage amount information and the fullness information can be obtained by detecting the kernel storage height, for example, by using a grain detection sensor, so each information can be obtained using separate sensors Cost reduction can be achieved for things.

It is a front view of a combine. It is a left view of a combine. It is a right side view of a combine. It is a top view of a control part. It is a display screen of a monitor. It is a block diagram of an imaging system. It is a perspective view of a Glen tank. It is a flowchart of focus control. It is a display screen of the monitor which switched to the camera.

  Embodiments of the present invention will be described based on the drawings. As shown in FIG. 1 to FIG. 3, the self-eliminating type combine 1 for threshing rice and wheat while cutting is provided with a traveling device 3 under the rectangular airframe 2 and this traveling device 3 is a left and right traveling frame A crawler 5 is wound around 4 and serves as a crawler type traveling device which drives this by a transmission. Further, a steering unit A covered by a cabin 6 is provided on the right front of the fuselage frame 2 when viewed from the forward direction of the fuselage. Furthermore, the reaper B is provided to be movable up and down by the hydraulic cylinder 7 from the left front of the fuselage frame 2 to the front of the control part A.

  Further, a threshing portion C is provided on the left side of the fuselage frame 2 at the rear of the reaper B, a gren tank 8 on the right side of the threshing portion C, and a discharge auger 9 for discharging the grain stored in the gren tank outside the machine. Set up. Then, a cutter 10 is provided behind the threshing portion C and the gren tank 8. Further, between the control unit A and the gren tank 8, a driving unit D constituted by a diesel engine or the like for driving the traveling device 3, the harvesting unit B, the threshing unit C, the discharge auger 9, the cutter 10 and the like is provided.

  Then, the reaper B divides the napped grain of the field into a reaping grain and a non-cropping grain by a weighing board 11 and a narrow guide 12 provided at the lower end of the front end. The cropped rice straw which has entered is caused by the claws of the raising device 13, and thereafter, the origin of the wheat straw is cut by the cutting blade 15 while being scratched by the scraping device 14. Furthermore, the grain scraps scraped backward by the scraping device 14 are merged by the left and right scraping transport chains and the tip transport chain constituting the lifting and conveying device 16, and the merged grain scraps are handled It transports to the threshing part C, adjusting the handling depth by the transport chain 17.

  Further, the threshing part C forms a throttling chamber on the upper part of a machine frame consisting of front and rear walls, left and right side walls, and a cylinder cover 18 covering the upper side, etc. A threshing feed chain 19 and a clamping rail 20 provided on the cylinder cover 18 for clamping and conveying along the throttling port, and a first throttling cylinder having a plurality of throttling teeth implanted around the periphery and a mesh are provided. In the processing chamber, processing chambers are disposed in parallel from the rear end tip side of the first threshing cylinder toward the rear of the airframe, and the processing chambers are provided to process the mixed scraps of grains that could not be shredded in the processing chamber. Provide a second threshing drum and a net. Further, below the first and second threshing cylinders, there is provided a sorting chamber comprising a swing sorting body for sorting and processing grains and the like leaking from a receiving net, a sorting air passage and the like.

  Then, the grain threshed and sorted at the threshing part C is transferred to the gren tank 8 via the grain growing device 21, and the gren tank 8 temporarily stores the grain, and then the discharge auger 9 Discharges the kernels deposited in the glen tank 8 into a container outside the aircraft. The discharge auger 9 allows the vertical helical cylinder 9a on the base side to be pivotable by a hydraulic motor, and the vertical helical cylinder 9b on the tip side to be pivotable up and down by a hydraulic cylinder, from the attitude to be stored in the machine It can be changed to the discharge posture facing backward.

  Furthermore, dust such as scale and dust generated in the threshing part C is sucked by a dust dust fan provided in the sorting chamber and discharged to the rear of the threshing part C from the dust discharge port. In addition, the waste discharged from the processing chamber after completion of the threshing process is transported toward the cutter 10 by the waste transport device, and the disc cutter 10 is discharged by the waste transport device. Shredded and released into the cutting site as a gutter.

   Next, the control unit A will be described. As shown in FIG. 3 and FIG. 4, the control unit A is provided with a floor 23 on the upper surface of an operation frame 22 provided on the front of the vehicle body frame 2. A lever frame is erected on the left and right sides, and the front cover 24, the rear cover 25 and the resin upper cover 26 are attached to the left and right lever frame on the front side. Further, the side cover 27 and the upper cover 28 are attached to the left lever frame and the left lever frame on the front side.

  Then, a multi-steering lever 29 for turning the machine body and moving up and down the reaper B is provided near the right side of the upper cover 26 on the front side. Further, a liquid crystal monitor 30 with a touch panel and several push buttons (switches) 31 are provided side by side near the center. The liquid crystal monitor 30 displays, for example, as shown in FIG. 5, the engine speed, vehicle speed, fuel, grain tank weight (gren tank storage), engine load factor, etc., and various automatic control The setting information or the image obtained by photographing the inside of the grain tank can be displayed, and the display content can be switched by the operation of the touch panel 32 or the push button 31.

  Further, back to the original, attach the switch case 33 to the left side of the upper cover 26 on the front side, and set the power clutch switch 34 for connecting and disconnecting the cutting clutch and the threshing clutch to the switch case 33, and the engine speed Various operation tools such as an engine rotation automatic dial 35 and a steering depth automatic switch 36 for turning on and off the steering depth automatic control are provided. Further, on the rear of the switch case 33, there are provided a main shift lever 37 and a sub shift lever 38 for shifting the traveling of the vehicle, and a combination switch 39 having a lighting switch, a flasher switch and a horn switch.

  The left upper cover 28 is also provided with a turning mode setting dial 40, a carp air volume setting dial 41, a sorting dial 42 and the like, among which the turning mode setting dial 40 brakes turning the vehicle and turns decelerated. Or set from the full mode turn. In addition, the Tang-up wind volume setting dial 41 sets the wind volume of the Tang-up Fan of the threshing section C. Further, the sorting dial 42 sets on / off of sorting automatic control and material conditions such as rice and wheat in sorting automatic control.

  In the rear of the floor 23, an engine cover frame is erected, a plurality of covers 43 are attached around the engine cover frame, and the inside is configured in an engine room. Then, the driver's seat 44 is attached to the front side engine cover frame via a bracket so as to be adjustable in the back and forth movement and the up and down movement, and the control unit A is configured. In addition, the cabin 6 includes a front window 45, a door 46, a rear window 47, a side window 48, a roof 49, and the like. Furthermore, the control unit A is provided with an auger remote controller (not shown) so that the discharge auger 9 can be operated up and down and turned by this auger remote controller, and grains can be discharged from the gren tank 8.

  Next, a video system for displaying an image obtained by shooting the inside of the gren tank 8 on the above-mentioned liquid crystal monitor 30 will be described. This video system includes a camera 50 for shooting the inside of the gren tank 8 as shown in FIG. 51, a liquid crystal controller (monitor ECU) 52, a liquid crystal monitor 30, and the like. Among them, the camera 50 includes a lens 50b having a focus lens 50a, an image sensor 50d built in the camera body 50c, an image processing LSI 50e, a stepping motor 50f, a drive control circuit 50g and the like.

  Further, the image controller 51 is constituted by an electronic control unit constituted by a microcomputer, a digital circuit, an A / D conversion circuit and the like, and a grain storage height constituted by a plurality of grain detection sensors 53a to 53e provided in the grain tank 8. Other than receiving signals from the touch sensor 53, the touch panel 32, and the push button (switch) 31, activating the buzzer 54, reading / writing from / to the external storage device 55, etc. Are communicably connected to each other via a control area network (CAN) and an electronic control unit 56 of

  The image controller 51 focuses the grain or the like stored in the grain tank 8 on the monitor 30 when photographing the inside of the grain tank 8 with the camera 50. The focus adjustment is performed by operating the driving unit 50a by the driving device (stepping motor 50f, drive control circuit 50g). Further, in performing the focus adjustment, the image control unit 51 performs the focus adjustment on the basis of the storage height 53 of the grain in the grain tank 8.

  Describing in more detail, as shown in FIG. 7, the gren tank 8 includes an upper storage portion 57 formed in a substantially rectangular parallelepiped shape by the front wall 57a, the rear wall 57b, the right wall 57c, the left wall 57d and the ceiling wall 57e; A box-shaped tank which is located below the storage portion 57 and integrally connects the lower-side brim portion 58 formed in a funnel shape by the front wall 58a, the rear wall 58b, and the inclined bottom walls 58c, 58d to store grains. Configure to In addition, the inclined bottom wall is comprised by the right side wall 58c and left side wall 58d which incline in V shape.

  In addition, the gren tank 8 has a transverse ladle 59 extending in the front and rear direction horizontally provided at the lower part of the brim portion 58, and a longitudinal lathe internally mounted on the longitudinal lamina barrels 9a and 9b of the discharge auger 9 is connected downstream of the lateral lath 59 Do. Furthermore, a chevron shaped flow plate 60 is provided above the transverse helix 59 to prevent application of a large grain pressure to the transverse helix 59 (see FIG. 9).

  Then, the opening 57f provided on the upper side of the left side wall 57d of the glen tank 8 faces the spit outlet 21a of the grain loading device 21, and the grains sorted by the threshing part C are scraped by a screw provided in the spit outlet 21a. It is discharged into the gren tank 8 by the discharge plate. When the grain is discharged from the glen tank 8 to the outside of the machine, the horizontal helix 59 is rotated by the power of the engine and finally discharged from the discharge port 9c provided at the tip of the vertical spiral cylinder 9b of the discharge auger 9 Do.

  Further, an inspection port 57g is provided on the ceiling wall 57e of the glen tank 8, and the inspection port 57g is covered with an openable cover 62 provided with a transparent plate 61. Further, an inspection port 57h is provided on an inclined surface near the top of the front wall 57a, and the inspection port 57h is covered with a transparent, openable and closable plate 63. Then, a photographing port 57i is provided at the corner of the left side of the gren tank 8 at the inspection port 57h, and the photographing port 57i is covered with a transparent plate 64 which can be opened and closed. A camera 50 is installed to shoot the inside of the unit 8.

  In addition, the optical axis of the lens of the camera 50 installed on the front wall 57a is set obliquely downstream, on the downstream side of the transverse helix 59 provided on the lower part of the flange 58. Further, a plurality of (five) grain detection sensors 53a to 53e configured by micro switches are provided on the back walls 58b and 57b of the glen tank 8 with a space between the top and bottom, and the grain is full on the ceiling wall 57e of the glen tank 8 A sensor 65 is provided.

  On the other hand, focus control executed by the video controller 51 will be described based on a flowchart shown in FIG. This focus control is executed when the touch panel 32 recognizes the "camera" indicated by the liquid crystal monitor 30 shown in FIG. 5 after power is supplied to the video controller 51 and the camera 50. Ru.

  Then, in the focus control, the image controller 51 first detects whether all the grain detection sensors 53a to 53e are off or detects the grain and turns on the present from the storage height information (0 to 5). The storage height is substituted into a variable i (step s1). Also, if the variable i is 4 or more, the grain detection sensor 53e is on, and the grain tank 8 is full, so a warning is issued to the worker by issuing a "full warning" via the buzzer 54 (step s2, s3).

  Further, on the display screen of the liquid crystal monitor 30 switched to the “camera” shown in FIG. 9, when the touch panel 32 recognizes that the long distance side or near distance side buttons L1 and L2 are pressed (step s4 If the manual operation is performed and it is on the far side (step s5), the value T (i) of the shooting distance table with respect to the current storage height is incremented (step s6). If it is the short distance side (step s7), the value T (i) of the photographing distance table is decremented (step s8).

  Next, the value T (i) of the shooting distance table for the current storage height is substituted as the shooting distance of the camera 50 (step s9). Further, the obtained shooting distance is given to the drive control circuit 50g of the camera 50, whereby the stepping motor 50f drives the focus lens 50a to match the specified shooting distance to perform focus adjustment. At the same time, the storage amount display (bar graph display L2 of the solid particle tank) on the display screen of the liquid crystal monitor 30 is updated based on the variable i (step s10).

  Then, when the rewrite button L4 is pressed on the display screen of the liquid crystal monitor 30 and a rewrite instruction is issued (step s11), the value T (i) of the photographing distance table or the entire value T of the photographing distance table is nonvolatile. The external storage unit 55 of the memory is rewritten and stored (step s12), and the process returns to the end.

  In the initial setting, the video controller 51 acquires the photographing distance table from the external storage device 55, and the photographing distances for the respective storage heights stored in the photographing distance table are previously determined by the grain detection sensors 53a to 53e. Can be determined based on the measurement result of the shooting distance between the subject (grain) and the camera 50 when the camera is turned on.

  Furthermore, although grain detection sensors 53a to 53e configured from micro switches are used as the grain storage height (i) in the grain tank 8, for example, a capacitance level sensor capable of continuous level measurement is used. The volume is determined from the weight sensor that measures the weight of the grain used or stored, and the moisture meter that detects the water content rate to estimate the storage height or discharge from the straw discharge port 21a of the grain growing device 21 The amount of grains to be used can be detected by an impact sensor, and the amount of accumulation can be determined by accumulating the amount of grains, and the storage height can be estimated from this, and the present invention is not necessarily limited to the switch measurement method.

  As mentioned above, although the outline | summary of the imaging | video system which image | photographs the inside of the grain tank 8 was demonstrated, when using this system in a cutting threshing operation | work, an operator switches the display of the liquid crystal monitor 30 to a camera, and makes the grain tank 8 display. Since the grain in the gren tank 8 is not stored so much at the beginning of the operation, the camera 50 is focused on the bottom of the gren tank 8 and focused on the near side as the grains are gradually stored.

  Moreover, it can not be generally said that the grain-raising device 21 discharges the grain toward the downstream side of the lateral helix 59, ie, the rear side of the gren tank 8, and the grain is the rear side ridge 58 and the reservoir above it While forming a mountain-like mass at 57, it gradually collapses and deposits on the surrounding and front sides. Therefore, the camera 50 is mounted so that the light axis is directed to the rear side (the downstream side of the transverse spiral 59) of the heel 58 obliquely downward from above the front side of the gren tank 8 Take a picture of kernels that are trying to settle and settle.

  Therefore, the worker observes the condition of the grain immediately after discharge which is focused and clearly projected, and for example, if there are many immature grains in the grain, the work is stopped and the work is delayed until the appropriate harvest period, If there is a lot of bellflowers, adjust the dust transfer valve (not shown) to lengthen the processing time in the threshing cylinder to reduce this, or if there is a lot of debris mixed up, adjust the air volume of the Karasumi fan with the Karasuka air volume setting dial 41 Adjustments can be made quickly, such as reducing them.

  When the enlargement button L5 is pressed on the display screen of the liquid crystal monitor 30, the liquid crystal controller 52 digitally zooms and displays a part of the image captured by the camera 50. Further, the enlarged area of the image can be selected from the position information touched by the touch panel 32. Furthermore, manual focus adjustment can be performed by pressing buttons L1 and L2 on the long distance side or near distance side, and if it is desired to maintain the manual focus information for the future, the rewrite button L4 can be pressed and left. .

  Further, the image projected on the liquid crystal monitor 30 is easy to understand because it is close to the image viewed from the inside of the gren tank 8 from the inspection opening 57h over the rear window 47 with the operator standing up from the driver's seat and facing back. It is easy to confirm the condition of the grain, since it is directed substantially in the same direction as the grain discharged from the straw discharge port 21a of the grain device 21 and these are not reflected so much. In addition, although the camera 50 is installed out of the gren tank 8, when the light axis is similarly set and installed in the gren tank 8, the grain discharged from the spit outlet 21a does not hit the camera 50, The durability of the camera 50 can be improved.

  Furthermore, the storage height of the grain in the glen tank 8 is divided into six areas (0 to 5) and detected using the five grain detection sensors 53a to 53e, and based on this, photographing with the subject Six distances are prepared and focus adjustment of the camera 50 is performed. Then, since the depth of field at each shooting distance at this time covers the grain storage height area, it becomes an image in which blurring does not occur over the entire area.

  However, the depth of field becomes shallow at the closest distance at which the grain is almost full, and there is also a possibility that a clear image can not be obtained due to the limitation of the focus range of the camera 50. Therefore, the number of grain detection sensors 53a to 53e is increased to increase the number of shooting distances, or a wide-angle lens is changed to a close-up shooting lens, or a telephoto lens is used to take measures to widen the focus range as much as possible. Is desirable.

  In the above embodiment, the camera 50 may be attached so as to photograph the inside of the gren tank 8 from the inspection opening 57 h provided near the upper center of the front wall 57 a of the gren tank 8 or a check provided on the ceiling wall 57 e of the gren tank 8. The camera 50 may be installed on the cover 62 of the mouth 57g so as to face directly below. In addition, although a color image is obtained by the camera 50, a monochrome image may be obtained, or the camera 50 may be provided with a zoom lens, and zoom adjustment may be performed according to the shooting distance, and the present invention is limited to the above embodiment. is not.

1 Combine 8 Glen Tank 21 Rising Device 30 LCD Monitor (Monitor)
32 touch panel 50 camera 50a focus lens 50f stepping motor 50g drive control circuit 51 image controller 52 liquid crystal controller 53 grain storage height sensor (grain detection sensor)
A control unit B reaping unit C threshing unit

Claims (5)

  A grain tank for storing grains discharged from a threshing part through a grain raising device, a camera equipped with a lens driving device to photograph the inside of the grain tank, a monitor for displaying an image photographed by the camera, and a grain tank And an image controller for operating the lens driving device based on the storage height of the grain to adjust the focus of the camera.   The image controller according to claim 1, further comprising: a photographing distance table estimated from the storage height of grains in the grain tank, and providing a value obtained from the photographing distance table to the lens driving device to perform focus adjustment. Combine.   3. The combine according to claim 2, wherein the video controller corrects a value obtained from the photographing distance table when a manual focus command is issued, and supplies the correction value to the lens drive device to perform focus adjustment.   4. The combine according to claim 3, wherein the image controller replaces the value obtained from the shooting distance table with a correction value and performs subsequent focus adjustment.   The image controller according to any one of claims 1 to 4, wherein the image controller causes the monitor to display the storage height of the grain in the gren tank and operates the buzzer to notify when the grain is full in the gren tank. Combine in one.

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