JP4704988B2 - Opening / closing operation structure of threshing device - Google Patents

Description

  The present invention constitutes a holding and conveying mechanism that sandwiches and conveys the stock side of the harvested cereal rice cake so that the tip side of the harvested grain rice cake passes between the receiving net and the handling cylinder between the lower conveyance body and the upper conveyance body. An opening / closing drive means for connecting an upper case provided with the upper transfer body and the handling cylinder to a lower case including the lower transfer body and the receiving net so that the upper case can be opened and closed, and driving the upper case to open and close And an opening / closing operation structure for a threshing apparatus, comprising: control means for controlling the operation of the opening / closing drive means; and command means for instructing the control means to open / close the upper case.

As the opening / closing operation structure of the threshing device as described above, the upper structure (upper case) is preset by the operation of the drive mechanism while the raising operation portion of the opening / closing switch (command means) is pushed. While the opening operation is being performed toward the (maintenance position) and the lowering operation portion of the open / close switch is being pushed, the upper structure is closed toward the lowering closing position (working position) set in advance by the operation of the drive mechanism. As described above, there is a configuration in which the open / close control means (control means) controls the operation of the drive means (open / close drive means) based on the operation of the open / close switch (see, for example, Patent Document 1).
JP 2001-190137 A

  In the above configuration, when performing maintenance such as cleaning of the receiving net and cylinder or exchanging the receiving net, the command means (the open / close switch is raised) until the upper case reaches the maintenance position (rising open position). It is necessary to continue the pressing operation on the operation unit). Further, when returning the upper case to the work position after maintenance, it is necessary to continue to push the command means (the opening / closing switch lowering part) until the upper case reaches a position before the work position. . Furthermore, after the upper case reaches the position before the work position, it is necessary to manually lower the upper case from the position before the work position to the work position. That is, there is room for improvement in improving operability when opening and closing the upper case.

  Therefore, in order to improve operability, the opening / closing operation of the upper case is automatically continued until the upper case reaches the work position or the maintenance position without continuing to push the command means. Thus, it is conceivable that the control means is configured to control the operation of the opening / closing drive means based on a command from the command means, etc., but in this configuration, in the middle of opening / closing between the work position and the maintenance position. The upper case cannot be stopped at the position.

  Therefore, when cereal clogging occurs in the threshing path, when the upper case is opened to perform appropriate measures against the clogging, the handling cylinder and the upper transport body provided in the upper case are provided in the lower case. The upper case is opened to a maintenance position that is greatly separated from the receiving net and the lower conveyance body, so that the harvested cereal grains that have been nipped and conveyed by the nipping and conveying mechanism are received by the receiving net provided in the lower case. In other words, it is only received and supported from below by the lower carrier, and a large lift on the tip side with the lower carrier as a fulcrum is allowed.

  As a result, when the harvested cereal rice cake is long or when mud adheres to the stocker side of the harvested cereal rice cake, the stocker side of the harvested cereal rice cake extending outward from the lower carrier The harvested cereal rice cake that is received and supported from below by the receiving net and the lower transport body with the weight of the lower part of the body while changing the posture to the downwardly inclined posture with the lower transport body as a fulcrum and the tip side greatly raised Inconvenience of sliding down tends to occur.

  The object of the present invention is to improve the operability when opening and closing the upper case, and to deal with clogging caused during the threshing process without causing inconvenience that the harvested cereal slides down to the outside of the vehicle body. There is to be able to do it.

In order to achieve the above object, according to the first aspect of the present invention, in the lower carrier and the upper carrier, the planted side of the harvested cereal rice cake so that the tip side of the harvested cereal rice cake passes between the receiving net and the handling cylinder. An upper case provided with the upper transfer body and the handling cylinder is operably connected to a lower case provided with the lower transfer body and the receiving net. An opening / closing driving means for opening / closing the upper case; a control means for controlling the operation of the opening / closing driving means; and a command means for instructing the opening / closing operation of the upper case to the control means. By controlling the operation of the opening / closing drive means based on a command from the command means, the upper case is moved to the lower side so that the upper case can be held and conveyed by the holding and conveying mechanism. Cutting with the handling cylinder close to the carrier The working cylinder and the upper transport body are disposed so that the handling cylinder is close to the receiving net so that the threshing process for the straw can be performed, and the gap between the receiving net and the handling cylinder is largely opened. In response to a command from the commanding means among three positions of a first maintenance position that is separated from the receiving net and the lower carrier and a second maintenance position set between the work position and the first maintenance position. It is configured so as to be switched and held in a corresponding position, and when the upper case reaches the first maintenance position, the upper case is prevented from dropping from the first maintenance position by operation control by the control means. When the upper case reaches the second maintenance position, the second case of the upper case is controlled by operation control by the control means. As drop prevention mechanism operated automatically to prevent falling from Maintenance Manual position,
A bracket that rotates integrally with the upper case, a first recess formed in the bracket to hold the upper case in the first maintenance position, and the upper case to hold the upper case in the second maintenance position. The fall prevention mechanism comprises an engagement pin supported on the lower case side so as to be freely withdrawn from and retracted from a second recess formed in the bracket, and an electric motor for withdrawing and retracting the engagement pin. is there.

  According to this configuration, the control case is controlled based on a command from the command unit, and the upper case is moved to a command from the command unit among the preset work position, the first maintenance position, and the second maintenance position. The corresponding position can be easily positioned without the need to continue the operation of the command means until the upper case reaches the position.

  And when carrying out threshing work, if the upper case is positioned at the working position, the pinching and transporting mechanism is set so that the tip side of the harvested grain basket passes between the receiving net and the handling cylinder. The former side is held and conveyed, and the barrel is subjected to threshing on the tip side. As a result, the threshing process by the handling cylinder can be appropriately performed on the tip side of the harvested cereal culm.

  When cleaning the receiving net or the handling cylinder or exchanging the receiving net, the upper case is positioned at the first maintenance position, and the handling cylinder and the upper transport body provided in the upper case are attached to the lower case. It is greatly separated from the receiving network and the lower conveyance body provided, and the space between them is greatly opened. As a result, maintenance such as cleaning of the receiving net and the handling cylinder or replacement of the receiving net can be easily performed.

  When cereal clogging occurs in the threshing path, if the upper case is positioned in the second maintenance, the handling cylinder and the upper transport body provided in the upper case are connected to the receiving net and the lower side provided in the lower case. The carrier is spaced relatively small enough to allow removal of the harvested cereal meal clogged between them. This makes it possible to easily remove the clogged cereal grains from the threshing path. In addition, the cutting operation of the upper case to the second maintenance position is possible because the harvested cereal rice cake that has been held and conveyed by the holding and transporting mechanism is a long cocoon, or mud adheres to the stock side of the harvested cereal rice cake. Along with this, the harvested cereal rice cake changes its posture in the downward direction in which the tip side floats up with the lower carrier as a fulcrum, with the weight on the stock side extending outward from the lower carrier. However, the tip side is received by the handling cylinder and is supported by the handling cylinder and the lower carrier, so that the posture change of the harvested cereal rice bowl to the downwardly inclined posture with the tip side greatly raised is performed. Be blocked.

  As a result, when appropriate measures are taken for clogging of cereals in the threshing route, the harvested cereals that have been transported by the sandwiching transport mechanism, which is easy to invite when the upper case is opened unnecessarily large, Further, it is possible to avoid the occurrence of inconveniences such as sliding down to the outside of the vehicle body while changing the posture to the downwardly inclined posture with the tip of the lower carrier as a fulcrum.

Therefore, as the operation position of the upper case, not only the work position suitable for the threshing process and the first maintenance position suitable for cleaning the receiving net and the barrel or changing the receiving net, but also the grain in the threshing route Maintaining high threshing performance and high maintainability for receiving nets, handling cylinders, etc., while maintaining a second maintenance position suitable for dealing with clogged clogs, maintainability against clogged clogs in the threshing route In addition, it is possible to improve the operability when operating the upper case at these three positions .

  FIG. 1 shows the entire side surface of the self-removable combine, and FIG. 2 shows the entire plane. This combine is formed by a pair of left and right crawlers at the lower part of a body frame 1 formed into a frame shape by a square pipe material or the like. Type cutting device 2 is installed, a cutting and conveying device 3 is connected to the front portion of the body frame 1 so as to be able to move up and down, a threshing device 4 is mounted on the left half of the body frame 1, and a threshing device 4 is connected to the rear portion of the threshing device 4. The straw conveying device 5 and the waste straw shredding device 6 are connected, a grain tank 7 is mounted on the right rear portion of the body frame 1, and the grain tank 7 is provided with a screw conveying type grain discharging device 8, and the body frame An engine 9 is mounted on the right front portion of 1 and a cabin 10 that forms a boarding operation unit is provided.

  Although not shown, the left and right crawler type traveling devices 2 are driven by the power transmitted from the engine 9 via the main transmission device, the auxiliary transmission device, and the like, and are provided with a main transmission lever and an auxiliary transmission lever provided in the boarding operation unit. In this drive state, the cross swing type and neutral return type control lever provided in the boarding operation unit is driven straight at a constant speed based on the horizontal swing operation of the control lever. The state is switched to a turning traveling state in which they are differential.

  In the cutting and conveying device 3, the power from the engine 9 is transmitted through the main transmission, the cutting clutch, and the like, and the cutting clutch is intermittently operated based on the operation of the cutting clutch lever provided in the boarding operation unit. The operation state is switched between the operation state and the stop state. In the operation state, as the vehicle body travels, a predetermined number of planted cereals to be harvested are sprouted and caused, and the stock side is cut off. Then, the cut cereal culm (cutted cereal culm) after being cut is conveyed toward the rear threshing device 4 while changing the posture from the standing posture to the sideways posture. Moreover, it raises / lowers by operating the cutting elevating mechanism based on the swinging operation of the control lever in the front-rear direction.

  In the threshing device 4, the power from the engine 9 is transmitted via a threshing clutch or the like, and the threshing clutch is intermittently operated based on the operation of the threshing clutch lever provided in the boarding operation unit, so that the operating state and the stopped state In its operating state, it receives the harvested cereal rice cake from the harvesting and conveying device 3, and conveys it toward the rear drainer conveying device 5 while performing the threshing process on the tip side of the harvested grain rice cake, Branches subjected to a sorting process on the processed product obtained by the threshing process, supplied to the grain tank 6 with the single grain selected as the first by the sorting process, and the branches selected as the second Threshing and sorting are performed again on unthreshed grains such as cereal grains, and dust such as cut straw and straw scraps sorted as No. 3 is discharged out of the vehicle.

  The waste straw conveying device 5 is driven by the power from the threshing device 4. In the driven state, the waste straw conveying device 5 receives the harvested cereals (the waste straw) after the threshing processing from the threshing device 4 and above the waste straw shredding device 6. Transport toward. The waste straw shredding device 6 is driven by the power from the threshing device 4, and a long straw discharge state in which the waste straw from the waste straw shredding device 6 is guided to the rear of the vehicle as it is and released outside the vehicle, and shredding processing It can be switched to a shredded discharge state that is released to the outside of the vehicle.

  The grain discharging device 8 is configured such that the power from the engine 9 is transmitted through a discharging clutch and the like, and the discharging clutch is intermittently operated based on the operation of the discharging switch provided in the boarding operation unit. Can be switched between an activated state and a stopped state in which the single-grained grains stored in the vehicle are discharged outside the vehicle. In addition, the discharge cylinder 8A (see FIGS. 1 and 2) swings up and down by operating the discharge raising / lowering mechanism based on the operation of the lift switch provided in the boarding operation unit, and the swing switch provided in the boarding operation unit is operated. Based on the operation, the discharge cylinder 8A is rotated by the operation of the discharge turning mechanism, and thus the single-grained grains stored in the grain tank 7 can be discharged to a desired discharge position such as a truck bed. it can.

  As shown in FIGS. 3 to 11, the threshing device 4 is formed in a processing space formed by a lower case 11 connected to the vehicle body frame 1 and an upper case 12 connected to the lower case 11 so as to be opened and closed. A threshing unit 13, a sorting unit 14, and a collecting unit 15 are provided.

  The threshing unit 13 includes a receiving chamber 16 detachably laid on the upper left side of the lower case 11 and an upper case 12, and a handling chamber 17 is formed between the handling cylinder 18 provided in the upper case 12 and the receiving net 16. A threshing path 19 is formed, and a feed chain (an example of a lower conveyance body) 20 provided at the upper left end of the lower case 11 and a clamping rail (an example of an upper conveyance body) 21 provided at the lower left end of the upper case 12 Further, a gripping and transporting mechanism 22 is configured that grips and transports the stock side of the harvested cereal rice cake so that the head side of the harvested cereal rice cake passes through the threshing path 19.

  The receiving net 16 is a grid-like concave receiving net that is formed in an arc shape that curves along the outer periphery of the handling cylinder 18 and that can be divided into two in the circumferential direction of the handling cylinder 18. However, the arcuate support frame 23 provided on the front wall 11A of the lower case 11 is supported so as to be relatively slidable in the circumferential direction of the handling cylinder 18, and the rear end thereof is provided on the auxiliary wall 11B of the lower case 11. The lower case is supported by the arc-shaped support frame 24 so as to be relatively slidable in the circumferential direction of the handling cylinder 18, and is fixed to the lower case 11 and moved along the front and rear support frames 23 and 24. 11 can be attached to and detached from the left end.

  The front wall 11A of the lower case 11 functions as a support member that receives and supports the front wall 12A of the upper case 12, and the auxiliary wall 11B of the lower case 11 functions as a support member that receives and supports the rear wall 12B of the upper case 12. Is configured to do.

  The handling cylinder 18 is configured by supporting a first processing cylinder 18A and a second processing cylinder 18B on a support shaft 25 extending in the front-rear direction across the front wall 12A and the rear wall 12B of the upper case 12 so as to be relatively rotatable. With the two front and rear divided structures, the processing cylinders 18A and 18B are rotated around the support shaft 25 as a fulcrum, and are conveyed to the threshing path 19 by a plurality of teeth 18a and 18b provided on the outer periphery thereof. While performing the threshing process on the tip side of the harvested cereal culm, the processed product obtained by the threshing process leaked from the receiving net 16 toward the sorting unit 14 and did not leak from the receiving net 16 The processed material is discharged toward the sorting unit 14 from a dust feeding port 26 formed at the bottom of the support frame 24 on the rear side.

  In the first processing cylinder 18A, the engine power transmitted to the threshing device 4 via the threshing clutch is distributed and supplied to the input pulley 27 integrally provided at the front end portion thereof via the first transmission belt 28 and the like. With the support shaft 25 as a fulcrum, it rotates clockwise as viewed from the front at a speed slower than that of the second processing cylinder 18B.

  In the second processing cylinder 18B, the engine power distributed by the first transmission belt 28 is transmitted to the input pulley 29 integrally provided at the rear end thereof via the transmission shaft 30 and the second transmission belt 31 facing forward and backward. As a result, with the support shaft 25 as a fulcrum, it rotates clockwise as viewed from the front at a speed faster than the first processing cylinder 18A.

  The sorting unit 14 includes a swing sorting mechanism 32 that includes a coarse sorting unit 32A and a fine sorting unit 32B, a main tang 33, a first sub tang 34, a second sub tang 35, and a dust outlet. 26, and a dust exhaust fan 37 that sucks and discharges dust such as straw scraps blown by the sorting air, and the like. The engine power transmitted to the threshing device 4 via the threshing clutch is distributed and supplied via a transmission belt and the like not shown.

  The swing sorting mechanism 32 is driven to swing by distributed power, so that the coarse sorting unit 32A can handle the processed material leaked from the receiving net 16 of the threshing unit 13 and the processed product carried out from the dust feed port 26. The sieving and sorting process was performed, and cut straws, straw scraps, etc. were formed on the rear wall 11C of the lower frame 11 while leaking the single grains and unthreshed grains of those processed products. It is transported toward the dust outlet 11a and discharged out of the vehicle from the dust outlet 11a. In addition, the fine sorting unit 32B performs sieving selection on the unigrained grains and unthreshed grains leaked from the coarse sorting section 32A, and the unthreshed grains etc. Move toward the lower side of the sorting direction).

  The main tang 33 is rotationally driven by the distribution power to generate a sorting wind that flows from the front lower side of the fine sorting unit 32B toward the dust outlet 11a and is included in the processed product from the coarse sorting unit 32A. Dust such as straw scraps is conveyed by wind toward the dust outlet 11a.

  The first auxiliary tang 33 is rotationally driven by the distribution power, thereby generating a sorting wind that flows from the front lower portion of the coarse sorting portion 32A toward the dust outlet 11a, to the processed material from the receiving net 16 The contained dust such as straw scraps is conveyed by wind toward the dust outlet 11a.

  The second sub-carp 35 is rotationally driven by the distribution power to generate a sorting wind that flows from the lower rear of the fine sorting unit 32B toward the dust outlet 11a, and the processing from the rear of the coarse sorting unit 32A. Dust such as straw scraps contained in the object is conveyed by wind toward the dust outlet 11a.

  The diffusion drum 36 is rotationally driven with distributed power to loosen the processed product discharged from the dust feed port 26 to the coarse sorting unit 32A, and to obtain a single grain or unthreshed grain contained in the processed product. The leakage from the rough sorting unit 32A is promoted.

  The dust exhaust fan 37 is driven to rotate by distributed power, and thereby sucks dust such as straw scraps conveyed by wind with the sorting wind and discharges it from the dust outlet 11a to the outside of the vehicle.

  As a result, the processed product from the threshing unit 13 is a single granulated grain that leaks from the fine sorting unit 32B, an unthreshed grain as the second product that is supplied behind the fine sorting unit 32B, and the like. Can be selected with high accuracy, such as foreign matter containing dust, and dust such as cut straw and straw scraps as the third thing discharged from the dust outlet 11a.

  The collecting unit 15 collects the single grain that has leaked from the fine sorting unit 32B by the first collecting unit 38 formed below the fine sorting unit 32B, and has not yet leaked from the fine sorting unit 32B. The grains, unthreshed grains that have leaked from the rear part of the coarse sorting section 32A, and the like are collected by a second collection section 39 formed behind the first collection section 38.

  Engine power transmitted to the threshing device 4 via the threshing clutch is distributed and supplied to the recovery unit 15 via a transmission belt or the like (not shown), and this power is provided at the bottom of the first recovery unit 38. The first screw 40 and the first vertical screw 41 erected over the right end portion and the upper end portion of the grain tank 7 are driven so that the single-grained grains recovered by the first recovery portion 38 can be obtained. Supply and transport toward the grain tank 7. Further, the second recovery unit 39 is driven by driving the second screw 42 provided at the bottom of the second recovery unit 39 and the second reduction screw 43 erected over the right end of the second recovery unit 39 and the upper part of the selection unit 14. The mixture collected in the above step is conveyed toward the upper end of the second reduction screw 43 and discharged and reduced from the upper end toward the front of the swing sorting mechanism 32.

The second reduction screw 43 is equipped with a second processing cylinder (not shown) that performs a threshing process on the mixture recovered by the second recovery unit 39.

  A reinforcement frame 44 that reinforces the upper portion of the lower case 11 by connecting the front wall 11A and the auxiliary wall 11B is disposed at the upper right portion of the lower case 11. The reinforcing frame 44 is made of a round pipe material or the like so as to have a function as a transmission case that houses the transmission shaft 30 and a function as a support shaft that supports the upper case 12 so as to be swingable up and down.

  The front case 12A and the rear wall 12B of the upper case 12 are connected to brackets 45 and 46 that are rotatably supported at both front and rear ends of the reinforcing frame 44, whereby the reinforcing frame 44 serves as a fulcrum. The lower case 11 is allowed to swing up and down.

  That is, the upper case 12 is connected to the lower case 11 so as to be opened and closed with respect to the lower case 11 by swinging up and down with the reinforcing frame 44 as a fulcrum.

  The swinging fulcrum portion of the upper case 12 is reinforced by a reinforcing frame 47 made of a square pipe material or the like that extends over the front and rear brackets 45 and 46.

  As shown in FIGS. 4 to 15, the opening / closing operation of the upper case 12 is performed on the basis of the opening / closing operation command from the command means 48 and the opening / closing operation position of the upper case 12 detected by the opening / closing detection means 49. Is performed by controlling the operation of the opening / closing drive means 51 that opens and closes the upper case 12.

  The command means 48 includes an open switch 52 and a close switch 53 that are automatic return type push button switches provided in the boarding operation section. The opening switch 52 outputs an opening operation command to the control device 50 every time a pressing operation is performed, and the closing switch 53 outputs a closing operation command to the control device 50 every time the pressing operation is performed (see FIG. 12). .

  The open / close detection means 49 is composed of a rotary potentiometer, and has a reinforcing frame 44 as a fulcrum through a linkage arm 54 and the like that is spring-biased so as to maintain a state of contact with the front bracket 45 from above. The swing angle of the front bracket 45 is detected as the opening / closing operation position of the upper case 12 (see FIGS. 13 to 15).

Based on the command information from the open switch 52 or the close switch 53 and the detection information from the open / close detection means 49 , the upper case 12 has a predetermined work position, a first maintenance position, and a second maintenance position. An opening / closing control means (an example of a control means) 50A for controlling the operation of the opening / closing drive means 51 is provided as a control program so as to be switched and held at a position corresponding to the command information among the three positions. 12).

  The working position is a fully closed position where the front wall 12A and the rear wall 12B of the upper case 12 are received and supported by the front wall 11A and the auxiliary wall 11B of the lower case 11, and in this position, the harvested cereal by the holding and conveying mechanism 22 The holding rail 21 is close to the feed chain 20 so that the straw can be held and conveyed, and the handling cylinder 18 is close to the receiving net 16 so that the threshing process can be performed on the harvested cereal by the handling cylinder 18. (See FIGS. 5 to 9 and FIG. 13).

  The first maintenance position is a fully open position in which the upper case 12 is farthest away from the lower case 11 by the operation of the opening / closing drive means 51. At this position, the space between the receiving net 16 and the handling cylinder 18 is greatly opened. The handling cylinder 18 and the holding rail 21 are separated from the receiving net 16 and the feed chain 20 (see FIGS. 11 and 15).

  The second maintenance position is an opening / closing midway position where the lowermost portion of the handling cylinder 18 is located at substantially the same height as the height on the conveying surface side of the feed chain 20 facing the holding rail 21. The barrel 18 and the clamping rail 21 are spaced relatively small from the receiving net 16 and the feed chain 20 so as to allow removal of the harvested cereal clogs in the threshing path 19 therebetween (see FIGS. 10 and 14). ).

  In other words, when performing threshing work, the upper case 12 is positioned at the working position so that the tip side of the harvested cereal rice cake passes between the receiving net 16 and the handling cylinder 18 so that the stock side of the harvested cereal meal rice cake. Can be sandwiched and transported by the sandwiching and transporting mechanism 22, and the threshing process by the handling cylinder 18 can be appropriately performed on the tip side.

  When cleaning the receiving net 16 and the handling cylinder 18 or exchanging the receiving net 16, the upper case 12 is positioned at the first maintenance position to clean the receiving net 16 and the handling cylinder 18. Maintenance of the receiving net 16 and the barrel 18 such as replacement of the 16 or repair of the teeth 18a and 18b can be easily performed.

  When the threshing path 19 is clogged with the harvested cereal meal, the upper case 12 is positioned at the second maintenance position to remove the clogged harvested grain meal from the threshing path 19 and to start the conveyance of the feed chain 20. Appropriate treatment for clogged cereals such as being placed on the part can be easily performed.

  Moreover, in the second maintenance position, the upper case 12 is obtained because the harvested cereal grains that have been held and conveyed by the clamping conveyance mechanism 22 are long, or mud adheres to the stock side of the harvested cereal grains. With the opening operation to the second maintenance position, the harvested cereal rice cake is weighted on the stock base side extending outward from the feed chain 20, and the tip side rises with the feed chain 20 as a fulcrum. Even if the posture is changed, the tip side is received by the handling cylinder 18 and is supported by the handling cylinder 18 and the feed chain 20, so that the downwardly inclined posture with the tip side greatly raised As a result, it is possible to avoid the slashing of the harvested cereals to the outside of the vehicle body due to the change in posture, and to pick up the sown cereals that have fallen. It is possible to eliminate the Mel effort.

  As shown in FIG. 4 and FIGS. 7 to 12, the opening / closing drive means 51 is a reciprocating hydraulic cylinder 55 installed over the lower case 11 and the upper case 12, and electromagnetic control for controlling the flow of hydraulic oil to the hydraulic cylinder 55. The upper case 12 is hydraulically driven to open and close by a valve 56 and a hydraulic pump 57 that pumps hydraulic oil toward the electromagnetic control valve 56.

  The hydraulic cylinder 55 is disposed between the rear support frame 24 and the second reduction screw 43 erected on the right outer side so as to be positioned within the front-rear width of the support frame 24.

  That is, the hydraulic cylinder 55 leaks the processed material from the receiving net 16 to the swing sorting mechanism 32, discharges the processed product from the dust feed port 26 formed at the bottom of the support frame 24 to the swing sorting mechanism 32, and The second reduction screw 43 is disposed so as not to hinder the release reduction of the mixture from the upper end portion of the second reduction screw 43 to the front side of the swing sorting mechanism 32.

  The electromagnetic control valve 56 is a three-position switching type, and by the control operation of the first control means 50A, the hydraulic cylinder 55 is extended and the upper case 12 is moved up and swinged, and the hydraulic cylinder 55 is contracted and the upper case is contracted. The position is switched between a descending position where 12 is moved downward and a stop position where the expansion and contraction of the hydraulic cylinder 55 is stopped and the upper case 12 is stopped moving up and down.

  The hydraulic pump 57 is linked to the engine 9 so as to be driven by power from the engine 9 (see FIG. 12). That is, the upper case 12 is configured to be opened / closed by hydraulic oil from the hydraulic pump 57 driven by engine power.

  As shown in FIGS. 5 to 8 and 12, the threshing device 4 has a fixed state that prevents the upper case 12 from being opened from the work position, and a release state that allows the upper case 12 to be opened from the work position. The fixing means 58 is configured to be switchable to each other, and the fixing means 58 includes a pair of front and rear fixing mechanisms 59 and 60.

  The front-side fixing mechanism 59 includes a first hook 62 that is provided on the front wall 11A of the lower case 11 so as to be swingable up and down via a longitudinal support shaft 61, and the front wall 12A of the upper case 12 to the front of the lower case 11. It is comprised by the 1st pin 64 projected ahead from the extension end of the extension member 63 extended toward the wall 11A. The rear-side fixing mechanism 60 is equipped with a second pin 65 protruding rearward on the auxiliary wall 11B of the lower case 11 and a rear wall 12B of the upper case 12 that can swing up and down via a support shaft 66 facing front and rear. The second hook 67 is configured.

  The first hook 62 is integrally equipped with a sector gear 62 </ b> A that meshes with a pinion gear 69 driven by a first electric motor 68 provided on the front wall 11 </ b> A of the lower case 11, and the first pin 64 64 is operated by the operation of the first electric motor 68. Is pivotally driven with the support shaft 61 as a fulcrum over an engagement position that engages from above and a disengagement position that releases the engagement with the first pin 64.

  The second hook 67 is integrally equipped with a sector gear 67A that meshes with a pinion gear 71 driven by a second electric motor 70 provided on the rear wall 12B of the upper case 12, and the second pin 65 is operated by the operation of the second electric motor 70. Is pivotally driven with the support shaft 66 as a fulcrum over an engagement position where the engagement is engaged from below and a disengagement position where the engagement with the second pin 65 is released.

  In other words, the fixing means 58 is switched to the fixed state by the first electric motor 68 and the second electric motor 70 being operated to swing the first hook 62 and the second hook 67 toward the engaging position. The first hook 62 and the second hook 67 are configured to switch to the released state by being driven to swing toward the non-engagement position.

  Thereby, even when the engagement of the first hook 62 or the second hook 67 with respect to the first pin 64 or the second pin 65 is strengthened due to the clogging of the harvested cereals in the threshing path 19 By the operation of the first electric motor 68 and the second electric motor 70, their engagement can be easily released, and it is possible to quickly cope with cereal clogging in the threshing path 19.

  As shown in FIGS. 5 to 8 and 12, the switching operation of the fixing means 58 is detected by the command information from the open switch 52 or the close switch 53, the detection information from the open / close detection means 49, and the operation detection means 72. The opening / closing control means 50A controls the operation of the first electric motor 68 and the second electric motor 70 based on the operating state of the fixing means 58.

  The operation detecting means 72 includes a first position sensor 73 provided on the front wall 11A of the lower case 11 and a second position sensor 74 provided on the rear wall 12B of the upper case 12, and the first position sensor 73 is The swing position of the first hook 62 with the support shaft 61 as a fulcrum is constituted by a rotary potentiometer that detects via the linkage link 75, and the second position sensor 74 has a second position with the support shaft 66 as a fulcrum. It is composed of a rotary potentiometer that detects the swing operation position of the hook 67 via the linkage link 76.

  In other words, the operation detection means 72 detects that the first position sensor 73 has reached the engagement position of the first hook 62 and the second position sensor 74 has detected that the second hook 67 has reached the engagement position. Thus, the fixing state of the fixing means 58 is detected, the first position sensor 73 detects the arrival of the first hook 62 to the non-engagement position, and the second position sensor 74 is detected by the second hook 67. It is configured to detect the release state of the fixing means 58 by detecting the arrival at the non-engagement position.

  As shown in FIGS. 1 to 3, 7, 8, 16, and 17, the waste straw transporter 5 receives the waste straw transported by the sandwich transport mechanism 22, The lower end of the lower case 11 where the transfer terminal portion of the transfer mechanism 22 is located is arranged at the upper left of the rear portion. The lower case 11 is equipped with a support frame 77 that supports the conveyance start end of the waste straw conveying device 5. The support frame 77 is erected on the left rear end of the lower case 11, and detours from the upper wall 78 of the lower case 11 toward the transfer start end of the discharge fan transfer device 5 and bypasses the discharge wall transfer path 79 of the discharge wall transfer device 5. From the front and rear first frame 80 made of a round pipe material formed so as to extend, and the upper right frame 81 disposed in the front and rear direction on the upper right portion of the lower case 11, the transport start end portion of the discharge straw transport device 5 The second frame 82 is made of a round pipe material extending toward the left and right, and the like. The extended ends of the first frame 80 and the second frame 82 are welded.

  In the upper case 12, the upper left frame 83 made of a square pipe material arranged in the front-rear direction at the upper left portion of the upper case 12 is overlapped with the extended end portion (front end portion) of the first frame 80 at its extended end portion (rear end portion). As described above, the upper case 12 is extended between the extended end portion of the upper left frame 83 and the extended end portion of the first frame 80 that are extended toward the extended end portion of the first frame 80. When located, the connecting means 84 for detachably connecting the upper left frame 83 to the first frame 80 is provided.

  That is, the upper left frame 83 of the upper case 12 can be connected to the support frame 77 of the lower case 11 by the connecting means 84, whereby the transfer start end portion of the discharge wall transfer device 5 can be connected to the support frame 77 of the lower case 11. The upper left frame 83 of the upper case 12 can be supported with higher support strength and better stability.

  The connecting means 84 is configured by a fixing pin 85 provided in the front-rear direction at the extending end portion of the first frame 80 and a hook 87 integrally provided at the rear end portion of the front-rear rotation shaft 86 provided in the upper left frame 83. Has been.

  The pivot shaft 86 is engaged with the fixing pin 85 in conjunction with the operation of the second hook 67 to the engagement position, and the hook 87 is interlocked with the operation of the second hook 67 to the non-engagement position. Is interlocked with the second hook 67 via a bent link 88 so that the engagement with the fixing pin 85 is released.

  That is, the connection means 84 is switched to a connection state in which the upper left frame 83 is connected to the support frame 77 as the rear fixing mechanism 60 is switched to the fixed state by the operation of the second electric motor 70, and the rear As the side fixing mechanism 60 is switched to the release state, it is configured to switch to the release state in which the connection of the upper left frame 83 to the support frame 77 is released.

  As a result, the operability can be improved as compared with the case where the connecting means 84 is configured to be manually operated, and the structure is simplified as compared with the case where a dedicated actuator for operating the connecting means 84 is provided. In addition, it is possible to reduce costs and to avoid forgetting to operate the connecting means 84 that may be caused when the connecting means 84 is operated independently.

  In addition, the upper case 12 positioned above the waste wall return path 79 is equipped with the second hook 67 of the fixing means 58, the second electric motor 70, and the hook 87 of the connecting means 84, so that the linkage can be achieved. As a result, it is possible to perform the operation without detouring the waste wall return path 79 as in the case where the lower case 11 is installed. As a result, the linkage configuration can be simplified.

  As shown in FIGS. 4 to 6, FIGS. 12 to 15, and FIG. 18, the threshing device 4 is equipped with a fall prevention mechanism 89 that prevents the upper case 12 from falling from the first maintenance position and the second maintenance position. Yes. The fall prevention mechanism 89 protrudes in the front-rear direction to the front wall 11A of the lower case 11 so that the front bracket 45 and the first recess 45a and the second recess 45b formed in the bracket 45 can be engaged from the front. The engaging pin 90 is configured to be retractable, and the electric motor 92 is configured to move the engaging pin 90 through a screw shaft 91 that is screwed into a female screw portion 90A formed on the engaging pin 90. ing.

  The first recess 45a is formed at a position facing the engagement pin 90 when the upper case 12 is opened to the first maintenance position in the front bracket 45, and the second recess 45b is formed at the front bracket 45. The upper case 12 is formed at a position facing the engagement pin 90 when the upper case 12 is opened to the second maintenance position.

  That is, the fall prevention mechanism 89 prevents the upper case 12 from dropping from the first maintenance position by engaging the engagement pin 90 with the first recess 45a, and engages the engagement pin 90 with the second recess 45b. This prevents the upper case 12 from falling from the second maintenance position. As a result, even when hydraulic oil leaks when the upper case 12 is positioned at the first maintenance position or the second maintenance position, the upper case 12 can be reliably maintained at those positions.

The operation of withdrawing / withdrawing the engaging pin 90 includes command information from the open switch 52 or the closing switch 53, detection information from the open / close detecting means 49, and a withdrawing / withdrawing detecting means 99 for detecting the position of the engaging pin 90 withdrawing / withdrawing. The opening / closing control means 50 </ b> A controls the operation of the electric motor 92 based on the detected information.

  The exit / exit detection means 99 is composed of a rotary potentiometer that detects the engagement pin 90 reaching the preset protrusion limit position and retraction limit position via the linkage link 100 or the like. The protrusion limit position is a position where the engagement pin 90 is securely engaged with the first recess 45a or the second recess 45b of the bracket 45, and the retraction limit position is the first recess 45a of the bracket 45 or the retraction limit position. This is the position where the engagement with the second recess 45b is reliably released.

  The control operation of the opening / closing control means 50A will be described. When the opening / closing control means 50A is instructed to open the upper case 12 from the opening switch 52, the current position of the upper case 12 is determined based on the detection information from the opening / closing detection means 49. Is determined.

If the current position of the upper case 12 is the work position, it is determined that the opening operation command from the open switch 52 at that time is for opening the upper case 12 from the work position to the second maintenance position. Based on the determination, the first electric motor 68 and the second electric motor 70 are operated in reverse so that the fixing means 58 is switched from the fixed state to the released state. When the operation detecting means 72 detects that the fixing means 58 is switched to the released state by the reverse operation, the first electric motor 68 and the second electric motor 70 are stopped based on the detection, and then the upper case 12 is The hydraulic cylinder 55 of the opening / closing drive means 51 is extended so that the opening operation (upward drive) is performed from the work position toward the second maintenance position. When the open / close detection means 49 detects that the upper case 12 has reached the second maintenance position by the extension operation, the hydraulic cylinder 55 is stopped and the electric motor 92 is forwardly operated based on the detection. The pin 90 is protruded toward the second recess 45b. When the withdrawal detection means 99 detects that the engagement pin 90 has reached the projection limit position by this projection operation, the electric motor 92 is stopped and the first notification lamp 93 provided in the boarding operation unit is turned on, The driver is notified of the arrival of the upper case 12 at the second maintenance position (see FIG. 14).

When the current position of the upper case 12 is the second maintenance position, an opening operation command from the opening switch 52 at that time is for opening the upper case 12 from the second maintenance position to the first maintenance position. Based on the determination, the electric motor 92 is reversely operated to retract the engagement pin 90 in a direction away from the second recess 45b. When the withdrawal detection means 99 detects that the engagement pin 90 has reached the retraction limit position by this retraction operation, the electric motor 92 is stopped and the upper case 12 is moved from the second maintenance position toward the first maintenance position. The hydraulic cylinder 55 of the opening / closing drive means 51 is extended so as to be opened (lifted). When the open / close detection means 49 detects that the upper case 12 has reached the first maintenance position by the extension operation, the hydraulic cylinder 55 is stopped and the electric motor 92 is forwardly operated based on the detection. The pin 90 is protruded toward the first recess 45a. When the withdrawal detection means 99 detects that the engaging pin 90 has reached the projection limit position by this projection operation, the electric motor 92 is stopped, the first notification lamp 93 is turned off, and the boarding operation unit is provided. The second notification lamp 94 is turned on to notify the driver that the upper case 12 has reached the first maintenance position (see FIG. 15).

  When the current position of the upper case 12 is the first maintenance position, it is determined that the opening operation command is due to an erroneous operation, and the upper case 12 is held at the first maintenance position.

When the close switch 53 is instructed to close the upper case 12, the current position of the upper case 12 is determined based on the detection information from the open / close detection means 49 .

When the current position of the upper case 12 is the first maintenance position or the second maintenance position, the closing operation command from the closing switch 53 at that time causes the upper case 12 to work from the first maintenance position or the second maintenance position. Based on the determination, the electric motor 92 is reversely operated to retract the engagement pin 90 in a direction away from the first recess 45a. When the withdrawal detection means 99 detects that the engaging pin 90 has reached the retreat limit position by this retraction operation, the electric motor 92 is stopped and the upper case 12 is moved from the first maintenance position or the second maintenance position to the work position. The hydraulic cylinder 55 of the opening / closing drive means 51 is contracted so as to be closed (driven downward). When the open / close detection means 49 detects that the upper case 12 has reached the working position by the contraction operation, the hydraulic cylinder 55 is stopped based on the detection, and the fixing means 58 is switched from the released state to the fixed state. Then, the first electric motor 68 and the second electric motor 70 are rotated forward. When the operation detecting means 72 detects that the fixing means 58 is switched to the fixed state by the forward rotation operation, the first electric motor 68 and the second electric motor 70 are stopped based on the detection, and the second notification lamp 94 or the first notification lamp 93 is turned off to inform the driver of the fixed holding of the upper case 12 at the work position (see FIG. 13).

  If the current position of the upper case 12 is the work position, it is determined that the closing operation command is due to an erroneous operation, and the upper case 12 is held at the work position.

  That is, even if the opening / closing operation of the upper case 12 from the boarding operation part where it is difficult to grasp the opening / closing operation position of the upper case 12, the opening / closing control means 50A based on the operation of the opening switch 52 or the closing switch 53 The upper case 12 reaches the position corresponding to the command from the open switch 52 or the close switch 53 among the three positions of the preset work position, the first maintenance position, and the second maintenance position. It is possible to easily and reliably position the switch without requiring the trouble of continuing the operation of the open switch 52 or the close switch 53.

  When the upper case 12 is positioned at the work position, the upper case 12 is always positioned at the second maintenance position by the control operation of the opening / closing control means 50A based on the opening operation command from the opening switch 52. As a result, there is a possibility of incurring when a dedicated switch for instructing the opening operation of the upper case 12 to the first maintenance position and a dedicated switch for instructing the opening operation to the second maintenance position are provided. The upper case 12 is opened all at once from the working position to the first maintenance position due to an erroneous operation of the switch when trying to deal with the cereal clogging in the threshing path 19 generated in the threshing path 19, and the nipping and conveying mechanism 22 holds and conveys The inconvenience that the harvested cereals that had been slid down to the outside of the vehicle body while changing the posture to the outer downward inclined posture with the feed chain 20 as a fulcrum and the tip side greatly raised with the weight of the stock side It can be avoided in advance.

  In addition, since the opening switch 52 and the closing switch 53 are provided in the boarding operation unit, for example, when maintenance is performed on the threshing device 4, the engine 9 is started to enable the upper case 12 to be opened by hydraulic pressure. Operation, switching of the fixing means 58 from the fixed state to the released state, switching of the connecting means 84 from the connected state to the released state, and opening of the upper case 12 from the working position to the first maintenance position or the second maintenance position. The operation and the stop operation of the engine 9 after the opening operation can be performed by a series of operations while in the boarding operation section. Further, when the maintenance on the threshing device 4 is finished, the engine 9 is started from the hydraulic operation so that the upper case 12 can be closed by hydraulic pressure, and the upper case 12 is operated from the first maintenance position or the second maintenance position. The closing operation to the position, the switching of the fixing means 58 from the released state to the fixed state, the switching of the connecting means 84 from the released state to the connected state, and the operation of stopping the engine 9 after fixing at the working position. It can be performed by a series of operations while in the boarding operation section.

  As a result, the operability when the upper case 12 is opened and closed can be improved, and the receiving net 16 and the handling cylinder 18 can be cleaned or the receiving net 16 can be replaced, or the clogged cereal grains can be removed from the threshing path 19. Thus, it is possible to improve workability when performing maintenance on the threshing device 4 such as placing it on the conveyance start end of the feed chain 20.

  As shown in FIG. 12, in the control apparatus 50, when the entering state of the threshing clutch is detected based on the detection information from the threshing clutch sensor 95 that detects the operating state of the threshing clutch, the opening / closing control means While the switching operation of the fixing means 58 and the connecting means 84 by the control operation of 50A and the opening / closing operation of the upper case 12 are blocked, the third notification lamp 96 provided in the boarding operation part is turned on, and the threshing clutch is in the engaged state. When the driver is informed that the threshing clutch is disengaged, the switching operation of the fixing means 58 and the connecting means 84 by the control operation of the opening / closing control means 50A and the opening / closing operation of the upper case 12 are performed. Checking means 50B that permits the above is provided as a control program.

  Accordingly, when the upper case 12 is opened to the first maintenance position or the second maintenance position, it is necessary to switch the threshing clutch to the disengaged state. As a result, the upper case 12 is moved to the first maintenance position or When performing the opening operation to the second maintenance position and performing maintenance on the threshing device 4, even if it is necessary to operate the engine 9 when performing the opening operation of the upper case 12 from the configuration of the opening / closing drive means 51, In addition, even if the engine 9 is forgotten to be stopped after the opening operation, an operation stop state of the threshing device 4 in which the handling cylinder 18 and the feed chain 20 are stopped from the stage before the upper case 12 is opened appears. Thus, maintenance for the threshing device 4 can be performed while the threshing device 4 is stopped.

  The threshing clutch sensor 95 is composed of a limit switch that is pressed by an operation to the cutting position of the threshing clutch lever.

  Based on the detection information from the discharge position condition means 97 for detecting the operation position of the discharge cylinder 8A of the grain discharge device 8, the check means 50B is positioned at the retraction position for the upper case opening operation set in advance. When it is detected that the vehicle has not been switched, the switching operation of the fixing means 58 and the connecting means 84 and the opening / closing operation of the upper case 12 by the control operation of the opening / closing control means 50A are blocked and the boarding operation section is provided. When the fourth notification lamp 98 is turned on to notify the driver that the discharge cylinder 8A is not operated at the retracted position, and when it is detected that the discharge tube 8A is positioned at the retracted position, the opening / closing control means 50A. The switching operation of the fixing means 58 and the connecting means 84 and the opening / closing operation of the upper case 12 by the control operation are allowed.

  Thereby, when the upper case 12 is opened to the first maintenance position or the second maintenance position, it is possible to avoid the possibility that the upper case 12 and the discharge cylinder 8A come into contact with each other and are damaged.

  The discharge position means 97 is composed of a rotary potentiometer that detects the elevation swing angle of the discharge cylinder 8A and a rotary potentiometer that detects the turning angle of the discharge cylinder 8A.

    [Another embodiment]

[1] The upper case 12 may be configured to be opened and closed by sliding up and down with respect to the lower case 11.

[2] A resin net or a crimp net may be employed as the receiving net 16.

[3] As the handling cylinder 18, one constituted by a single processing cylinder may be adopted, or one having spiral teeth may be adopted.

[4] The sandwiching and transporting mechanism 22 may be configured by adopting a sandwiching rail for the lower transporting body 20 and a feed chain for the upper transporting body 21.

[5] As the command means 48, a single push button switch is used to open the upper case 12 from the work position to the second maintenance position, and from the second maintenance position to the first maintenance position for each pressing operation. An opening operation and a closing operation from the first maintenance to the work position may be commanded in that order. Alternatively, the upper case 12 may be provided with three dedicated switches for commanding operations to the work position, the first maintenance position, or the second maintenance position. Further, it may be configured by a three-position switching type changeover switch that commands operation to the work position of the upper case 12, the first maintenance position, or the second maintenance position according to the operation position.

[6] The command means 48 commands the opening operation from the work position of the upper case 12 to the second maintenance position by a one-shot operation that is less than the set time of the open switch 52, and presses the open switch 52 for longer than the set time. It may be configured to command an opening operation from the work position of the upper case 12 to the second maintenance position by an operation.

[7] The command means 48 may be provided in the threshing device 4 or the like.

[8] The control unit 50A, or may be configured to control the actuation of the actuation and drop prevention mechanism 89 of the opening and closing drive means 51.

[9] The control means 50A may be configured to detect the operation position of the upper case 12, the first maintenance position, and the arrival at the second maintenance position from the operation time of the opening / closing drive means 51. Good.

[10] The control unit 50A is configured to perform the opening operation of the upper case 12 after performing the switching operation from the on state to the off state of the threshing clutch based on the opening operation command from the command unit 48. It may be a thing.

[11] The opening / closing drive means 51 may be configured to open / close the upper case 12 by operating a single-acting hydraulic cylinder, hydraulic motor, electric cylinder, or electric motor.

[12] The operation of the opening / closing drive means 51 may be configured to switch between the fixed state and the released state of the fixing means 58 and to switch between the connected state and the released state of the connecting means 84.

[13] As the second maintenance position, the harvested grain that can be treated for clogging of the grain in the threshing path 19 between the operating position and the first maintenance position and that has been sandwiched and transported by the sandwiching transport mechanism 22 Various changes are possible as long as it is a position that can prevent the vehicle from sliding off the vehicle body with the lower carrier 20 as a fulcrum.

Overall side view of self-removing combine Overall plan view of self-removing combine Longitudinal side view of threshing device Cross-sectional plan view of threshing section Front view of the threshing device showing a state where the upper case is fixed to the working position by the fixing means. Front view of the threshing device showing a state in which the fixing of the upper case at the working position by the fixing means is released Longitudinal rear view of the threshing device showing a state where the upper case is fixed to the working position by the fixing means. Longitudinal rear view of the threshing device showing a state in which the fixing of the upper case at the working position by the fixing means is released Longitudinal front view of the threshing device showing the state where the upper case is located at the working position Longitudinal front view of the threshing apparatus showing a state where the upper case is located at the second maintenance position Longitudinal front view of the threshing apparatus showing a state where the upper case is located at the first maintenance position Block diagram showing the control configuration for opening and closing the upper case Longitudinal front view of the main part showing the state of the open / close detection means and the fall prevention mechanism at the work position of the upper case Longitudinal front view of the main part showing the state of the open / close detection means and the fall prevention mechanism at the second maintenance position of the upper case Longitudinal front view of the main part showing the state of the open / close detection means and the fall prevention mechanism at the first maintenance position of the upper case Longitudinal side view of main part showing configuration and operation structure of connecting means A longitudinal rear view of the main part showing the connected state and the disconnected state of the connecting means Vertical side view of the main part showing the configuration of the fall prevention mechanism

DESCRIPTION OF SYMBOLS 11 Lower case 12 Upper case 16 Receiving net | network 18 Handling cylinder 20 Lower conveyance body 21 Upper conveyance body 22 Nipping conveyance mechanism
45 bracket
45a first recess
45b second recess 48 command means 51 opening / closing drive means 50A control means
89 Fall prevention mechanism
92 electric motor

Claims (1)

The lower conveyance body and the upper conveyance body constitute a sandwich conveyance mechanism for nipping and conveying the stock side of the harvested cereal rice cake so that the tip side of the harvested grain rice cake passes between the receiving net and the handling cylinder,
An upper case including the upper transport body and the handling cylinder is connected to a lower case including the lower transport body and the receiving net so as to be opened and closed.
An opening / closing drive means for opening and closing the upper case, a control means for controlling the operation of the opening / closing drive means, and a command means for commanding the control means to open and close the upper case,
The control means controls the operation of the opening / closing drive means based on a command from the command means, so that the upper case can be held and transported by the clamping and transport mechanism. Work position where the handling cylinder is close to the receiving net so that the conveying body is close to the lower conveying body and the threshing process can be performed on the harvested cereal by the handling cylinder, the receiving net and the handling cylinder A first maintenance position where the handling cylinder and the upper transport body are separated from the receiving net and the lower transport body, and between the work position and the first maintenance position. And is configured to be switched and held at a position corresponding to the command from the command means among the three positions of the second maintenance position set to
When the upper case reaches the first maintenance position, the upper case automatically operates to prevent the upper case from falling from the first maintenance position by the operation control by the control means, and the upper case is When the second maintenance position is reached, a fall prevention mechanism that automatically operates to prevent the upper case from falling from the second maintenance position is provided by operation control by the control means ;
A bracket that rotates integrally with the upper case, a first recess formed in the bracket to hold the upper case in the first maintenance position, and the upper case to hold the upper case in the second maintenance position. The fall prevention mechanism comprises an engagement pin supported on the lower case side so as to be freely withdrawn from and retracted from a second recess formed in the bracket, and an electric motor for withdrawing and retracting the engagement pin. An opening / closing operation structure for a threshing device.

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