JP4750649B2 - Agricultural machine - Google Patents

Description

  The present invention relates to a farming machine such as a rice transplanter, a tractor, or a combiner that performs a seedling planting operation continuously with, for example, a seedling stand and a seedling planting claw, and more specifically displays the working status and alarms of the farming machine. The present invention relates to a structure for cooling a display panel device.

Conventionally, in farming machines such as rice transplanters and combines, in particular, riding-type farming machines, a display panel device is provided on the upper surface side of the hood cover body that covers the upper part of the driving unit column or engine arranged in front of the driver's seat. Is attached (see, for example, Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 8-205662 (see FIGS. 1 and 4) Japanese Patent Laid-Open No. 9-140227 (see FIGS. 2 and 6)

  In recent years, display panels have been replaced with ordinary incandescent lamps instead of ordinary incandescent lamps so that workers can easily see them outdoors and exposed to sunlight, such as farming machines. In many cases, a large number of colored light emitting diodes are used. Therefore, in order to drive and control these light emitting diodes, an electronic circuit board on which electronic parts such as transistors and semiconductor elements are mounted is provided in the main body case of the display panel device. By supplying a large current to the electronic circuit for driving and control, the internal temperature of the display panel device is significantly increased by the radiant heat generated from the electronic component and the radiant heat from the sunlight, and the life of the components of the display panel device is increased. There was a problem that became shorter or damaged.

  In order to prevent this, the main body case is usually air-cooled by natural convection by opening an air inlet and exhaust port, and an electric cooling fan is installed inside the main body case of the display panel device. It is conceivable to cool by forcibly generating an air flow.

  However, there is a problem that the cooling effect is not so much obtained only by the natural convection of air, and if an electric cooling fan is provided, the manufacturing cost for that is increased.

  The present invention has been made to solve these problems of the prior art, and is a cooling system for forcibly discharging heat generated from the engine during work in farming machines such as rice transplanters and combines. It is intended to provide a device (structure) for cooling the display panel device efficiently and inexpensively by using a fan and a blower (blower fan) for the working unit. is there.

In order to achieve the above object, an invention according to claim 1 is a display panel device for covering the engine portion with a bonnet cover body and displaying a work state and an alarm to the driver at a position in front of the driver seat. A main body case of the display panel device is attached to an upper surface of the bonnet cover body, and the main body case is provided with an air suction port and an air discharge port at a place other than the display unit, and the air discharge port or the In an agricultural machine in which an exhaust pipe connected to an air discharge port is disposed in the vicinity of an air suction side of an engine cooling fan, the air discharge port is provided in the vicinity of an arrangement position of an electronic component in the main body case, and one end of the air discharge port The exhaust pipe connected to is guided downward in the internal space of the bonnet cover body, and the lower end opening of this exhaust pipe faces the vicinity of the cooling air intake of the engine cooling fan, Serial using a negative pressure of the engine cooling fan, the heat air inside the main body case is obtained by configured to drain the body outside.

  According to the first aspect of the present invention, the exhaust tube is connected to the air discharge port provided in the main body case of the display panel device, and the open end of the exhaust tube is disposed in the vicinity of the air suction side of the cooling fan. Thus, when the cooling fan is activated, the negative pressure when the surrounding air is sucked in acts on the open end of the exhaust pipe, and the air in the main body case is sucked out through the exhaust pipe. On the other hand, since the air intake is provided in the main body case, the outside air is sucked into the main body case, and the forced flow of the cooling air can be performed. Since the configuration for that purpose is only the air inlet, the air outlet, and the exhaust tube formed in the main body case, the manufacturing cost is reduced.

  In addition, the air inlet and the air outlet are locations other than the display part, and are covered with the driving unit cover body, so that dust during farm work and rain from the outside can be passed through the air inlet. There is an effect that the failure rate of the display panel device can be reduced without entering the case.

According to the invention described in claim 1, as compared with the case providing a separate off-en and a driving source, an effect that cost decreases.

Further, since the air discharge port is provided in the vicinity of the arrangement position of the semiconductor element having a large calorific value in the main body case, there is an effect that heat can be efficiently discharged to the outside.

  Hereinafter, an embodiment in which the present invention is embodied in a rice transplanter will be described in detail with reference to the drawings. 1 is a side view of the whole rice transplanter, FIG. 2 is a plan view thereof, FIG. 3 is a perspective view showing an air-cooled engine mounted on a vehicle body frame, an engine cooling cover body, etc., and FIG. 5 is a longitudinal sectional view of the bonnet cover body and the engine cooling cover body, etc. FIG. 6 is a plan view of the bonnet cover body and the engine cooling cover body, FIG. 7 is a plan view of the display panel device, and FIG. 9 is a bottom view of the panel device, FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 7, and FIG. 10 is a cross-sectional view taken along line XX in FIG.

  An air-cooled engine 2 is mounted on the front portion of the vehicle body frame 3 of the traveling vehicle 1 on which an operator is boarded. A paddy field traveling front wheel 6 is supported on the side of a transmission case (not shown) via a front axle case 5, and a paddy field traveling rear wheel 8 is supported on a rear axle case 7 located behind the transmission case. On both sides of the bonnet cover body 9 that covers the engine 2 and the like, preliminary seedling platforms 10 are provided in multiple stages on frames that are erected from the body frame 3.

  A vehicle body cover 11 on which an operator rides covers the vehicle body frame 3 and the like, and a driver's seat 13 is attached to the rear side of the upper surface of the vehicle body cover 11 via a seat frame 12. A steering handle 14 is provided.

  The seedling planting device 15 is configured such that the hitch bracket 18 on the front side of the planting case 17 is connected to the rear side of the traveling vehicle 1 through a lifting link mechanism including a top link 20 and a lower link 19 so as to be movable up and down. A hydraulic lift cylinder 21 that lifts and lowers the seedling planting device 15 through a mechanism is connected to the lower link 19.

  The seedling mounting table 16 for eight-row planting is made of a synthetic resin arranged in a low shape before and after the front. The seedling stage 16 is supported by the planting case 17 through the lower rail 22 and the upper rail 23 so as to be slidable in the left-right reciprocating manner, and the planting case 17 supports a rotary case 24 that rotates at a constant speed in one direction. A pair of claw cases 25 are arranged at symmetrical positions around the rotational axis of the rotary case 24, and seedling planting claws 26 are respectively attached to the tips of the claw cases 25.

  A central two-level flat center float 27, left and right two-level flat side float 28, and left and right outermost one level flat auxiliary float 29 are arranged on the side of the planting case 20. Although not shown, a PTO output shaft protruding rearward of the transmission case is connected to an input shaft of the planting case 17 through a universal joint shaft, and power is transmitted to the seedling planting device 15.

  With the above-described configuration, the front and rear wheels 6 and 8 are driven and moved while the seedling planting device 25 is lowered so that the floats 27, 28, and 29 slide on the mud surface of the field. One seedling is taken out from the seedling stage 16 to be moved by the planting claws 26, and rice transplanting work for continuously planting seedlings can be performed.

  The eight-way side strip fertilizer 31 is on the rear side of the traveling vehicle 1, and is located behind the driver seat 13 along the width direction of the traveling vehicle 1 and the rear portion of the vehicle body cover 11. Each of the floats 27, 28 has a single blower 33 fixed to one side of the deck, a fertilizer transport hose (not shown), etc., and the fertilizer in each fertilizer hopper 32 is blown by the blower (fertilizer blower) 33. , 29 side groovers (not shown) are configured to discharge the fertilizer.

  In FIG. 2, reference numeral 34 denotes a main transmission lever, 35 denotes a planting operation lever for raising / lowering the seedling planting device 15, turning on / off the planting clutch, and marker operation, 36, a transmission pedal, 37, an accelerator lever, and 38, a unit clutch. It is a lever.

  Next, the configuration of the engine cooling cover body of the engine 2 in the bonnet cover body 9 will be described. As shown in FIGS. 3, 4, and 5, an engine cooling fan 41 is disposed in the fan case 40 on the rear side of the engine 2, and an air (cooling air) intake 42 is opened at the center of the rear surface of the fan case 40. ing. A dust-proof net 43 is stretched over the air intake 42, and an oil cooler 44 such as engine oil, mission oil, and transmission (HST) oil is arranged vertically and horizontally in the rear of the air intake 42. I am letting. The oil cooler 44 is connected to and supported by a handle column 45 of the steering handle 14 via a mounting base and a mounting plate. As a result, the air sucked from the lower surface side of the vehicle body cover 11 to the lower end side of the bonnet cover body 9 is taken into the air intake port 42 while touching the oil cooler 44. Therefore, a cooling fan dedicated to the oil cooler 44 is separately provided. The oil cooler 44 is forcibly cooled using the engine cooling fan 41 without being provided, so that the cooling effect of the oil cooler 44 can be improved and the oil cooler 44 can be incorporated in a small and compact manner.

  The rear upper side of the engine 2 is covered with a rectangular box-shaped ventilation cover 46 connected to the fan case 40 so that the fan chamber 48 in the fan case 40 communicates with the cleaner chamber 49 in the ventilation cover 46. An air cleaner 47 for the engine 2 is disposed in the cleaner chamber 49 (see FIG. 5).

  Further, the front upper side of the engine 2 is covered with a front wind-exhaust front exhaust cover 50 and a cooling exhaust passage 51 communicating with the cleaner chamber 49 is formed inside the exhaust cover 50, as shown in FIG. Then, the cooling air after flowing through the cleaner chamber 49 is discharged to the outside from the air outlet 52 that opens to the front surface of the bonnet 9 through the air exhaust passage 51. Thereby, the temperature rise of the cleaner chamber 49 is suppressed, and cool air is sent into the carburetor so as to increase the output of the engine 2 and improve the fuel consumption. The air exhaust port 52 is disposed above the step portion 11a of the vehicle body cover 11. The air exhaust from the air exhaust port 52 does not hit the seedling of the cocoon, and can prevent the seedling from being damaged.

  Further, as shown in FIG. 4 and FIG. 5, a wind guide for merging and guiding hot air (engine cooling air) circulated and discharged forward from the left and right sides of the fan case 40 through the left and right sides of the engine 2. The plate 53 is disposed on the front side of the engine 2. The wind guide plate 53 has a confluence portion 53a for converging the winds from the left and right, and a lower discharge portion 53b for collecting and guiding the merged wind to the left side of the engine 2 and discharging it in a L shape when viewed from the front. The shape of the upper corner portion (upper, left, right, forward) of 53a is formed by guide surfaces 53c each having an obtuse angle, and hot air after circulation of the engine 2 is smoothly merged at the merging portion 53a and the lower side of the discharge portion 53b It is configured so as to be discharged downward more favorably than the discharge port 54 and to improve the hot air discharge efficiency.

  Further, in order to dispose an electrical component 56 such as a relay related to the engine 2 above the ventilation cover 46 and the exhaust cover 50, an electrical mount 58 is attached to a frame 57 connected to the front portion of the vehicle body frame 3 and the handle column 45 and the like. The electrical component 56 is removably attached. With this configuration, even in the structure in which the electrical component 56 is disposed near the upper position of the engine 2, adverse effects such as the heat of the engine 2 being directly transmitted to the electrical component 56 are reduced.

  Next, the configuration of the display panel device 60 disposed on the upper surface of the bonnet cover body 9 and the cooling structure thereof will be described.

  As shown in FIGS. 5 and 7 to 10, a planting for turning on / off the automatic planting depth adjustment is provided on the right side of the upper surface of the bonnet cover body 9 near the lower side of the steering handle 14. An automatic depth adjustment switch 63a and a buzzer stop switch 63b for stopping the warning buzzer are provided (see FIG. 7). Similarly, a combination switch 63c is arranged on the left side part, and an automatic inclination control switch 63d for automatically adjusting the right and left inclination of the seedling planting device 15 is arranged on the left and right central part.

  Among the upper surface of the bonnet cover body 9, the opening 9 a in front of the switch arrangement portion has a surface cover body 61 made of a transparent resin covering the upper surface side of the display panel device 60 and the lower surface side of the display panel device 60. And a bottom cover body 62 for covering. The front cover body 61 and the bottom cover body 62 are injection molded parts made of a synthetic resin material, and a main body case in the display panel device 60 is configured in a state where the edges of both the cover bodies 61 and 62 are superposed. Are fastened and fixed by screws 64 at a plurality of locations to a screw-fixing boss 9 b protruding from the inner surface of the bonnet cover body 9.

  More specifically, an inner case 60a of the display panel device 60 is fixed in the internal space of the main body case surrounded by the front cover body 61 and the bottom cover body 62, and a liquid crystal display section (panel) 60b is provided on the upper surface side thereof. An electronic component 60d including a semiconductor element such as an integrated circuit element for driving and controlling the LED 60c serving as a backlight or the liquid crystal display unit 60b and the LED 60c is mounted on the case 60f on the lower surface side of the middle case 60a. A printed wiring board (control board) 60e is fixed (see FIGS. 9 and 10). A space 65 is formed between the case 60 f and the printed wiring board 60 e and the bottom cover body 62.

  In the flat surface portion of the bottom cover body 62, a large-diameter hole 66 through which a coupler for wiring connection between a control unit and a power source provided at another place and a connector on the printed wiring board 60e is passed, and the surface cover body An air discharge port 67 for discharging heat in the internal space of the main body case surrounded by 61 and the bottom cover body 62, in particular, heat generated from the electronic component 60d such as a semiconductor element in the printed wiring board 60e. A plurality of air inlets 68 for introducing cooling air into the internal space (especially the space 65) are formed by drilling (see FIGS. 8, 9 and 10).

  The large-diameter hole 66 is closed together with the wiring cable by a flexible coupler cover 66a (see the two-dot chain line in FIGS. 9 and 10), and the air inlet 68 is as shown in FIG. 10 (b). Since the substantially semicircular arc-shaped hole 68a is provided, foreign matter such as large dust and insects can be prevented from entering the main body case.

  A flexible exhaust cylinder 69 such as a rubber hose having one end connected to the air exhaust port 67 is guided downward in the internal space of the bonnet cover body 9, and the lower end opening (open end) of the exhaust cylinder 69 is connected to the engine. It faces the cooling fan 41, in the embodiment, the cooling air intake 42 (see FIGS. 5 and 6). By connecting and fixing the lower end portion of the exhaust tube 69 to the handle column 45 or the like, the posture is held so that the lower end opening portion of the exhaust tube 69 faces the cooling air inlet 42.

  As shown in FIG. 7, the display panel device 60 includes a liquid crystal display unit 60 b that can display a plurality of characters side by side, a pictogram display unit on the upper part thereof, that is, a seedling warning display unit 70 a, and a planting case 17. A unit clutch alarm display unit 70b, a fertilizer replenishment alarm display unit 70c, a fertilizer clogging alarm display unit 70d for displaying the stop state of the unit clutch for each pair of rotary cases 24, and fuel displayed on the outer periphery thereof An engine state display unit 70e, a planting clutch warning display unit 70f, a planting depth automatic control display unit 70g, and the like are arranged. In the pictogram display portion, when the LED 60c of the backlight is turned on, pictograms drawn on the panel on the front surface clearly emerge. The work status of the rice transplanter corresponding to the lighting of each display unit, the content of the alarm, the instructions, etc. are displayed on the liquid crystal display unit 60b in characters.

  As described above, when the display panel device 60 is turned on, a semiconductor element or the like in the printed wiring board 60e is placed in the internal space (particularly the space 65) of the main body case surrounded by the front cover body 61 and the bottom cover body 62. Since the heat generated from the electronic component 60d is accumulated, the open end of the exhaust cylinder 69 connected to the air exhaust port 67 of the bottom cover body 62 faces the cooling air intake port 42 in the vicinity of the suction side of the engine cooling fan 41. Thus, the heat in the internal space of the main body case can be discharged together with air to the outside of the traveling vehicle 1 using the negative pressure of the engine cooling fan 41. In the case of the embodiment, the bonnet cover body passes through the inside of the fan case 40, the inside of the engine cooling cover body such as the ventilation cover 46, and the exhaust cover 50 by the air generated by the engine cooling fan 41 by the heat generated from the engine 2. 9, and further, hot air (engine cooling air) is circulated and discharged below the vehicle body frame 3 from the left and right sides of the fan case 40 through the left and right sides of the engine 2 through the front air guide plates 53. In this case, the heat in the display panel device 60 can be discharged at the same time.

  In the embodiment, the outer periphery of the engine is covered with the engine cooling cover body including the fan case 40, the ventilation cover 46, the exhaust cover 50, the air guide plate 53, and the like. It becomes a heat shielding material, and heat (radiant heat) generated from the engine 2 raises the air inside the bonnet cover body 9 and does not directly act on the display panel device 60. Therefore, the temperature rise in the main body case of the display panel device 60 is prevented. It can be effectively prevented.

  As other embodiments, the air outlet in the main body case of the display panel device 60 disposed at an appropriate position of the hood cover body 9 that is a cover body of the driving unit or the vehicle body cover 11 that is visible to the operator of the driver's seat 13. Although not shown, a flexible exhaust pipe such as a rubber hose connected to 67 is provided along the bonnet cover body 9 or the lower surface of the vehicle body cover 11 and a suction port of a blower fan installed at an appropriate location of the traveling vehicle 1 By extending to the vicinity, the heat of the body case internal space (particularly the space 65) can be efficiently discharged to the outside using the negative pressure of the blower fan. The blower fan may be the fertilizer blower 33 described above, or may be a cooling fan for a control means provided in a place other than the bonnet cover body 9 or a working fan.

  In these cases, the air discharge port 67 can be exhausted more efficiently by being provided near an electronic component such as a semiconductor element which is a heat generation source.

It is the whole rice transplanter side view. It is a whole top view of a rice transplanter. FIG. 3 is a perspective view showing an air-cooled engine and an engine cooling cover body mounted on the vehicle body frame. Similarly, it is a right side view. It is longitudinal cross-sectional views, such as a bonnet cover body and an engine cooling cover body. It is a top view of the plane cross section of a bonnet cover body, and an engine cooling cover body. It is a top view of a display panel apparatus. It is a bottom view of a display panel apparatus. It is the IX-IX arrow directional cross-sectional view of FIG. It is XX arrow directional cross-sectional view of FIG.

2 Engine 3 Body frame 9 Bonnet cover body 11 Body cover 33 Blower (fertilizer blower)
40 Fan Case as Part of Engine Cooling Cover Body 41 Engine Cooling Fan 42 Cooling Air Intake Port 46 Ventilation Cover 50 Ventilation Cover 60 Display Panel Device 61 Surface Cover Body 62 Bottom Cover Body 67 Air Exhaust Port 68 Air Intake Port 69 Exhaust pipe

Claims (1)

The engine unit is covered with a bonnet cover body, and a display panel device is provided at the front position of the driver's seat to display a work state and an alarm to the driver. A main body case of the display panel device is provided on the upper surface of the bonnet cover body. The main body case is provided with an air inlet and an air outlet at locations other than the display unit, and the air outlet or the exhaust pipe connected to the air outlet is connected to the air suction side of the engine cooling fan. In the agricultural machine placed in the vicinity ,
The air outlet is provided in the vicinity of the arrangement position of the electronic component in the main body case,
The exhaust pipe having one end connected to the air discharge port is guided downward in the internal space of the bonnet cover body, and the lower end opening of the exhaust pipe is exposed to the vicinity of the cooling air intake port of the engine cooling fan,
A farm working machine configured to discharge the heated air in the main body case to the outside of the machine body by utilizing the negative pressure of the engine cooling fan .

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