Harvesting work vehicle

Abstract

To provide a conventional problem of a harvesting work vehicle where a foreign object such as a pebble adhered on a leaf part enters into a selection part simultaneously during harvesting of root crops, and enters into stored crops.SOLUTION: A conveyance path for conveying root crops is configured of vertical two-staged belt, where a section for not holding a foreign object in the conveyance path is provided by a partially widened part where a gap distance between the right-left belt is widened to remove the foreign object.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a harvesting vehicle for root vegetables, typically carrots. [Background technology]

[0002] Conventionally, when harvesting root vegetables, the work vehicle would pull the vegetables out of the soil, and as a result, small stones attached to the teeth of the vegetables would sometimes be sent from the digging section to the transport section at the same time.

[0003] To address the issues with the conventional technology, there is a technology that uses the jet force of water to separate the particles (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-270648 Summary of the Invention [Problem to be solved by the invention]

[0005] In the prior art, one technique for separating and removing stones from root vegetables involves providing a conveyor with a transport section with inclined protrusions in the water, and using the jet force of water to separate the stones.

[0006] However, such a water-using system is difficult to equip on a work vehicle that travels through the field. Also, root vegetables are pulled out with their stems and leaves still attached, and the stems are then cut after transport. Not only is it difficult to immerse the vegetables in water during this process, but water cannot be separated from the stems when they are cut after transport, making automatic cutting difficult.

[0007] The present invention addresses this issue by providing a work vehicle with a simple structure that can separate stones and other foreign objects by adjusting the force with which root vegetables are held during transport. [Means for solving the problem]

[0008] The first aspect of the present invention is achieved by the following technical means.

[0009] This is the path of the clamping and conveying section located between the section where vegetables are pulled out of the soil in the field and the stem and leaf cutting section where the stems and leaves of the pulled vegetables are cut. The clamping and conveying section is made up of two belt stages, upper and lower, with a gap distance provided, and also has widening sections that partially widen the gap distance between the left and right belts of the upper and lower stages, and has the function of removing foreign matter from the clamping and conveying mechanism.

[0010] The second invention is solved by the following technical means.

[0011] The widening section partially widens the gap between the left and right belts, and a foreign object collection case is provided below the area where foreign objects fall.

[0012] The third aspect of the invention is solved by the following technical means.

[0013] A scraper is provided in the gap between the left and right belts to collide with foreign matter and drop the foreign matter from the nipping and conveying section. [Effects of the Invention]

[0014] According to the first invention, it is possible to remove foreign matter such as pebbles adhering to the leaves of the pulled-out vegetables.

[0015] According to the second invention, the separated foreign matter can be collected without being returned to the field.

[0016] According to the third aspect of the present invention, the separation of foreign matter can be carried out more reliably. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a front view of a work vehicle according to an embodiment of the present invention; [Figure 2] FIG. 1 is a left side view of a work vehicle according to an embodiment of the present invention. [Figure 3] FIG. 1 is a top view of a work vehicle according to an embodiment of the present invention. [Figure 4] FIG. 1 is a perspective view of a work vehicle from below on the left side in an embodiment of the present invention. [Figure 5] FIG. 1 is an enlarged view of a foreign matter removal configuration in a transport path according to the present invention; [Figure 6] FIG. 1 is a plan view of a foreign matter removal configuration in a transport path according to the present invention; [Figure 7] A diagram showing the configuration of removing foreign matter from the conveying path of the present invention, using a scraper. [Figure 8] 1 is a diagram showing the configuration of the sorting and conveying section for cutting remaining leaves in another embodiment of the present invention; [Figure 9] 1 is a diagram showing the structure of the storage section for cutting the remaining leaves in another embodiment of the present invention. [Figure 10] FIG. 10 is a diagram showing the configuration of a regenerative power supply device for a leaf ejection unit according to another embodiment of the present invention. [Figure 11] Schematic diagram of the leaf and stem cutting unit and leaf removal unit of the present invention. [Figure 12] FIG. 10 is a diagram showing the configuration of a height detection sensor for a digging section in another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] The work vehicle of the present invention will now be described.

[0019] <Overall structure> As shown in Figures 1, 2, and 3, the carrot harvester is composed of a traveling section A that moves the machine body, a control section B on which the operator rides, a harvesting section C that pulls carrots from the field on one side of the machine body and transports them to the upper rear of the machine body, a stem and leaf cutting section D that takes over the carrots from the harvesting section C and transports them to the rear of the machine body while cutting the stems and leaves, a sorting and transporting section E that receives carrots that fall from the stem and leaf cutting section D and transports them from one side of the machine body to the other side, where an assistant worker sorts the carrots during transport, and a storage section F that stores the carrots discharged from the sorting and transporting section E.

[0020] <Running section A> Left and right crawlers 6L, 6R are formed by winding left and right belts 5, 5 around left and right drive sprockets 2, 2 on the front side of the machine body and left and right driven wheels 3, 3 on the rear side of the machine body below the machine frame 1, and multiple rollers 4 attached between the left and right drive sprockets 2, 2 and the left and right driven wheels 3, 3. The left and right drive sprockets 2, 2 of the left and right crawlers 6L, 6R are attached to left and right drive shafts 8, 8 extending on both the left and right sides from a transmission case 7 to which engine power is transmitted, and the left and right crawlers 6L, 6R are attached to the machine frame 1 with a certain left-right gap between them.

[0021] <Control Unit B> A control frame 9 is attached to the upper right side of the aircraft frame 1, and a pilot seat 10 is attached to the control frame 9, and a control panel 11 is attached to the front side of the aircraft.

[0022] The control panel 11 is provided with a speed change control lever 12 that operates the HST to change the forward / reverse movement and running speed of the machine, a lifting control lever 13 that controls the left and right turning of the machine and the working height of the harvesting section C, a digging lever 14 that engages and disengages the clutch of the working section, a throttle lever 15 that controls the engine speed, and a main speed change lever 67 that operates the gear-type transmission in the transmission case 7 to change the speed between running speed, neutral, working speed, and low speed.

[0023] A radiator cover that protects the radiator that cools the engine and takes in cooling air is detachably attached to the other left or right side of the aircraft (right side of the aircraft) of the control unit frame 9, thereby forming a control unit B.

[0024] With the above configuration, by providing a control member such as the speed change control lever 12 or the lift control lever 13 that can perform multiple operations with one lever, it becomes easier to control the aircraft, thereby reducing the workload of the pilot.

[0025] <Harvesting Section C> Left and right driven pulleys 17, 17 are rotatably attached to the front of the left and right pull-out frames 16R, 16L, and left and right drive pulleys are attached to the rear of the machine. Left and right clamping conveyor belts 19, 19 that pull out carrots and transport them to the rear of the machine are wound around the left and right driven pulleys 17, 17 and the left and right drive pulleys 18, 18. The left and right clamping conveyor belts 19, 19 are tensioned by a plurality of tension rollers, and the inner side surfaces of the left and right clamping conveyor belts 19, 19 are pressed against each other to form a carrot pulling and transporting path R.

[0026] A rotating frame 20 is attached to the top of the body frame 1, and is rotatable up and down around a rotation fulcrum axis 21 in the left-right direction of the body. A transmission case 22 that transmits driving force to the left and right drive pulleys 18, 18 is attached to the rear end of the rotating frame 20, and is rotatable up and down around the rotation fulcrum.

[0027] In addition, an inverter-controlled electric cylinder 23 is provided between the machine frame 1 and the rotating frame 20, and the electric cylinder 23 is attached so that it can be operated by automatic operation control or the lifting operation lever 13 of the control unit B to form a pulling-out and conveying device 24, and by operating the electric cylinder 23, the rotating frame 20 is rotated about the rotation fulcrum shaft 21 to change the working height of the field surface at the front end of the pulling-out and conveying device 24.

[0028] The electric cylinder 23 has its base pivoted to the machine frame 1 by a base pivot, and its tip pivoted to the upper end of an arm fixed to the rotating frame 20 by a tip pivot. The electric cylinder 23 is composed of an electric motor whose rotation speed is controlled (inverter) by a control device (CPU), and a rod that expands and contracts by a driven gear that meshes with the drive gear of the electric motor.

[0029] Also provided in front of the pulling-out and conveying device 24 are a vertical raising device 25 that raises the stems and leaves K of carrots, a horizontal raising device 26 that scoops up the stems and leaves K raised by the vertical raising device 25, a weeding rod 27 provided in front of the horizontal raising device 26, a working height sensor 28 that detects the working height from the field surface at the front end of the pulling-out and conveying device 24, left and right vibrating soilers 29, 29 that vibrate with the driving force of the engine to loosen the soil on the left and right of the carrots in the field, and left and right weeding bars whose tips penetrate into the field to weed the left and right stems and leaves K of the carrots. Since the carrots can be prevented from coming into contact with the left and right vibrating soilers 29, 29, etc. and being damaged, the commercial value of the carrots is improved.

[0030] The working height sensor 28 is composed of a gauge wheel freely rotatably mounted on the tip of an up / down operating arm that is pivoted on a pivot shaft in the left / right direction of the machine body at the lower end of a sensor support frame whose base is fixed to the left and right pull-out frames 16, 16, and a potentiometer (angle sensor) mounted on the up / down operating arm to detect the up / down operating angle of the up / down operating arm.

[0031] <Stem and leaf cutting section D> As shown in FIGS. 1 and 2, left and right shoulder aligning bars 35 are provided on the lower surface of the upper portion of the drawing and conveying device 24 as shoulder aligning tools.

[0032] The left and right shoulder aligning bars 35 are formed by rods whose bases are fixed to the left and right pulling frames 16, 16 of the pulling and conveying device 24 and whose rear ends extend toward the front of the stem and leaf cutting section D.

[0033] The carrot roots, which are clamped by the left and right clamping conveying belts 19, 19 at the stems and leaves K and transported diagonally backward, are transported toward the front of the stem and leaf cutting section D with their upper ends in contact with the left and right shoulder alignment bars 35.Therefore, the stems and leaves clamped by the left and right clamping conveying belts 19, 19 are gradually pulled downward until they reach the front of the stem and leaf cutting section D, at which point the distance from the lower ends of the left and right clamping conveying belts 19, 19 to the upper end of the roots becomes constant, and the upper ends of the roots are aligned at a constant height when the stems and leaves are transferred from the left and right clamping conveying belts 19, 19 to the stem and leaf cutting section D.

[0034] The stem and leaf cutting section D has, from the front side, a front shoulder alignment section 37, a lower stem and leaf clamping and conveying section 38 and a rear shoulder alignment section 39 on the lower side, and an upper stem and leaf clamping and conveying section 40 on the upper level.

[0035] The front shoulder alignment section 37 is made up of opposing left and right front shoulder alignment chain sections. Each of the left and right front shoulder alignment chain sections has a clamping chain wound around a drive sprocket and a driven sprocket provided at the front and rear.

[0036] The rear end of the left and right shoulder alignment bar 35 is located below the front part of the left and right front shoulder alignment chain part of this front shoulder alignment part 37, and with the upper ends of the carrot roots aligned at a certain height, the carrot stems and leaves K are transferred from the left and right clamping conveyor belts 19, 19 to the front part of the left and right front shoulder alignment chain part of the front shoulder alignment part 37.

[0037] The drive sprocket is provided with a rotation speed measurement sensor, and the control device calculates the movement distance of the clamping chain from the PCD and rotation speed of the drive sprocket.

[0038] The rear shoulder alignment section 39 is made up of opposing left and right rear shoulder alignment chain sections. Each of the left and right rear shoulder alignment chain sections has a clamping chain wound around a drive sprocket and two driven sprockets provided at the front and rear.

[0039] The lower stem and leaf clamping and conveying section 38 is composed of opposing left and right lower stem and leaf clamping belt sections 38L, 38R. Each of the left and right lower stem and leaf clamping belt sections 38L, 38R has a clamping belt 38d wound around a driving pulley 38a, a driven pulley 38b, and an idler pulley 38c provided at the front and rear of the belt sections.

[0040] The upper stem and leaf clamping and conveying section 40 is composed of opposing left and right upper stem and leaf clamping belt sections 40L, 40R. Each of the left and right upper stem and leaf clamping belt sections 40L, 40R has a clamping belt 40d wound around a drive pulley 40a, a driven pulley 40b, and an idler pulley 40c provided at the front and rear of the belt sections.

[0041] The lower stem and leaf clamping and conveying section 38 and the upper stem and leaf clamping and conveying section 40 take over the carrot stems and leaves from the rear of the left and right front shoulder alignment chains of the front shoulder alignment section 37, clamp them, and convey them rearward. The carrot stems and leaves clamped by the left and right clamping and conveying belts 19, 19 of the pulling and conveying device 24 are released downward from the left and right clamping and conveying belts 19, 19 as they are clamped and conveyed rearward by the front shoulder alignment section 37, the lower stem and leaf clamping and conveying section 38, and the upper stem and leaf clamping and conveying section 40.

[0042] <Sorting and Conveying Section E> As shown in Figure 9, the sorting and conveying device 44 is arranged on the left and right sides of the body from the rear below of the extracting and conveying device 24 in the harvesting section C toward the storage section F where the flexi-con bags 47, which are storage members for storing harvested crops, are located, and is composed of a base chain conveyor 46a with bars spaced at regular intervals that rotates by driving force from the engine, and an up and down operating chain conveyor 44a.

[0043] The front side of the base chain conveyor 46a, separated by a wall 46b at the left end of the sorting and conveying device 44, is located below the non-defective cutting section 41, and receives the roots N of non-defective carrots that fall downward after their stems and leaves K are cut by the fixed blades 41e, and conveys them to the right of the machine body. The non-defective carrots are then conveyed to the storage section F on the right by the vertically operating chain conveyor 44a.

[0044] In addition, an auxiliary work seat 48 is provided on the rear side of the machine body of the sorting and conveying device 44, and a worker seated on the auxiliary work seat 48 takes out non-marketable carrots (small carrots and broken carrots) from the carrots sent by the sorting and conveying device 44, and sends only carrots with proper market value to the storage section F.

[0045] <Containment Unit F> As shown in Figures 1, 3 and 8, the storage section F is located below the right end of the sorting and conveying device 44, and is composed of a hanging hanger 56 provided at the right end of the sorting and conveying device 44, and a loading table 57 on which the flexible container bags hung from the hanging hanger 56 are placed.

[0046] The vertically moving chain conveyor 44a of the sorting and conveying device 44 extends obliquely upward from the base at the left end to the upper right end. That is, it rotates by the driving force of the engine, conveying the carrots obliquely upward and releasing them downward from the upper end.

[0047] The base of the vertically operating chain conveyor 44a is rotatable about a rotary shaft, and the piston tip of a vertically operating hydraulic cylinder 58, whose base is pivotally supported on the machine frame 1, is connected to its midpoint.

[0048] That is, while the worker seated on the auxiliary work seat 48 presses down on the up switch, the up / down hydraulic cylinder 58 extends and rotates around the pivot shaft to raise the up / down operating chain conveyor 44a, and while the worker presses down on the down switch, the up / down operating hydraulic cylinder 58 contracts and rotates around the pivot shaft to lower the up / down operating chain conveyor 44a.

[0049] The hanging hanger 56 is provided at the right end of the vertically operating chain conveyor 44a. The four hooks 56a of the hanging hanger 56 are hooked onto the locking holes in the upper edge of the flexible container bag above the mounting table 57, thereby suspending and supporting the flexible container bag. At this time, the vertically operating chain conveyor 44a is raised to a position where the bottom of the suspended flexible container bag is supported by the mounting table 57.

[0050] The non-defective carrot roots transported by the vertically operating chain conveyor 44a of the sorting and transporting device 44 are released downward from the right end of the vertically operating chain conveyor 44a and stored in a flexible container bag through the upper opening of the flexible container bag hung from four hooks 56a of the hanging hanger 56.

[0051] The background of the present invention will be explained.

[0052] As shown in Figures 4 and 5, the clamping and conveying belts 19 are arranged overlapping each other, with a gap of 10 mm width, which is about the size of a pebble, such as upper belt 19AR (19AL) and lower belt 19BR (19BL). Each belt is the same length on the left and right, and the combination of the upper and lower belts is also the same length.

[0053] Furthermore, the speed of the four belts on the left and right and the top and bottom is the same, and there is no difference in rotation, so root vegetables such as carrots can be sandwiched between the belts and transported in parallel directions.

[0054] However, the width of each belt is narrower than when it is configured as a single belt. In other words, the width of one belt is divided into two, with a gap of one pebble between each divided belt. In this way, the clamping and conveying section is configured with two belts, one above the other, with a gap distance provided.

[0055] For this reason, when the harvested product is carrots, the conventional wide belt firmly grips the base of the stems and leaves from below, so if small stones or other objects get caught in the leaves, the small stones get caught in the belt as well, and the small stones are sent as they are to the clamping and conveying section, along with the carrots, to the sorting section.

[0056] In the present invention, the belt width is narrowed and a gap is provided for the pebbles to pass through, so that even if a carrot and a pebbles enter the clamping conveying section at the same time, the pebbles will pass through this gap and fall while moving along the conveying path.

[0057] Another method for separating foreign objects is to temporarily place a position within the conveyor belt where the leaf portion is not clamped. This method is achieved by creating a gap between the left and right belts. However, if the gap is widened in the left-right direction, the vegetable itself cannot be held. Therefore, the two-tiered belt configuration of the present invention is used.

[0058] The clamping and conveying belt 19 is a double belt, and is configured so that if either belt is in contact, it will clamp the harvested product. By shifting the positions at which the belts 19AR (19AL) and 19BR (19BL) spread, only one side of the belt is held. With this configuration, if a carrot and a pebble are clamped at the spread position, the clamping force weakens at the spread position, making it impossible to clamp the pebble and allowing it to fall from the belt.

[0059] In this way, the first invention has a clamping and conveying section made up of two belt tiers, upper and lower, with a gap between them, and also has widening sections that partially widen the gap between the left and right belts on the upper and lower tiers, resulting in a device that separates pebbles and other foreign objects by allowing them to fall naturally without being clamped together with the carrots.

[0060] In addition, in the second invention, the fallen pebbles do not return to the field, but are secured in foreign object collection cases 65 and 66 below the area where the foreign objects fall at the widening section that partially widens the gap between the left and right belts, making it possible to collect the foreign objects.

[0061] The configuration is described with reference to Figure 5. A foreign object collection case 65 is located below the spreading portion 61A of the upper belts 19AR and 19AL. A foreign object collection case 66 is located below the spreading portion 62B of the lower belts 19BR and 19BL. Pebbles that fall from spreading portion 61A and 61B may enter the foreign object collection case 65 directly, or they may roll along the surface of the lower belt 19BR (belt 19BL) and fall off spreading portion 62A and 62B, eventually entering the foreign object collection case 66 below. By offsetting the spreading portions of the upper and lower belts and positioning the foreign object collection cases to collect foreign objects, foreign objects can be separated and collected with precision. These foreign object collection cases 65 and 66 are easily detachable and can slide into the case that protects the nip-and-conveyor belt 19.

[0062] The positional relationship between the upper and lower belts and the widened portions of the belts may be reversed, and the widened portion of the lower belt may be located at the rear in the conveying direction, opposite to that shown in the figure. This configuration is suitable for cases where the speed of the pinch conveying belt 19 is fast and pebbles, which are foreign objects, are drawn by the speed of the belt and flow in the conveying direction.

[0063] Figure 6 shows the overall foreign object removal system. (A) is a front view, (B) is a left side view, and (C) is a vertical view with the exterior removed to show the arrangement of the clamping and conveying belt 19. The upper belt 19AR (belt 19AL) of the clamping and conveying belt 19 is shown, while the lower belt 19B is omitted. As shown in (C), the spreading portion 61A is spread by a fulcrum pin 63, and the spreading portion 61B is spread by a fulcrum pin 64. The fulcrum pins are rotatable, and when the carrots come into contact with them, they rotate, but do not create frictional resistance. Instead, they are made of resin, so no damage to the crop occurs. (B) shows the relative positions of the upper spreading portions 61A and 61B and the lower spreading portions 62A and 62B. As mentioned above, the arrangement may be reversed. The fulcrum pins 63 and 64 can also be made of rotating bearings.

[0064] 7 shows a mechanism for forcibly removing foreign matter without using the aforementioned widening portion when foreign matter is caught in the nipping and conveying belt 19. In FIG. 7(A), the long belt 19AR (belt 19AL) is shown in a shortened form.

[0065] Although a single scraper 70 is effective, it may be provided in two or more locations, as shown in the figure. Also, while only the upper belt 19AR (belt 19AL) is shown in this figure, this is because the upper belt 19AR (belt 19AL) is configured to clamp the leaf portion of the root vegetables, and the lower belt 19BR (belt 19BL) is configured to clamp the main portion of the root vegetables below the base, separating pebbles that may be mixed in with the leaf portion. However, some configurations have the function of holding leaves both above and below, so depending on how they are held, a scraper may also be provided on the lower belt 19BR (belt 19BL), or there may be configurations where a scraper is provided on one or both of the upper and lower belts.

[0066] Figure 7(B) is a cross-sectional view taken perpendicular to the longitudinal direction of 19AR (belt 19AL). The scraper 70 has a gap between the belt surface 19A1 and the scraper 70 that allows pebbles to pass through, preventing clogging between the scraper 70 and 19AR (belt 19AL). The scraper 70 is also located in the center of the gap between 19AR and belt 19AL. Although there is a gap to hold root vegetables such as carrots, the scraper's location in the center of this gap ensures reliable contact with pebbles.

[0067] 7(C) is a cross-sectional view parallel to the longitudinal direction of 19AR (belt 19AL). The tip of scraper 70 is shaped at an angle as shown in 70A, and by gradually penetrating belt 19AR (belt 19AL), pebbles 71 can be dropped downward as shown. However, the tip of the scraper does not extend beyond the bottom end of belt 19AR (belt 19AL), which prevents damage to the harvested root vegetables and enables the separation of pebbles 71.

[0068] The third aspect of the present invention is achieved by providing a scraper in the gap between the left and right belts, which collides with foreign objects and causes the foreign objects to fall from the nip-and-convey section.

[0069] Figure 8 shows a configuration in which a stem cutting blade is installed near the conveyor. Figure 8(A) shows the sorting and conveying device 44. This conveying section conveys high-quality root vegetables (carrots) with their leaves cut off, but sometimes root vegetables that are not cut properly and still have leaves remain are mixed in. In this case, an assistant worker at the auxiliary work seat 48 finds and sorts them, cuts off the leaves with a knife or other tool, and returns them to the conveying section. However, because the conveying speed is fast, it takes time for the assistant worker to cut them with a knife every time, which is not an effective task. As a solution to this problem, a residual leaf cutting unit 80 is installed on the side of the sorting and conveying device 44 in the conveying direction. It has a long hole 81 that is smaller than the diameter of the root vegetable and larger than the base of the root vegetable's leaves. By using a cutting blade 82, the state shown in Figure 8(C) is achieved, and the residual leaf portion 101 of the root vegetable (carrot) 100 is cut off. Although it is a similar configuration, a remaining leaf cutting section 90 is provided at the front of the sorting and conveying device 44 as shown in Figure 8(B). In this section, a long hole 91 is made wider, and the width of the long hole 91 can be adjusted by shifting the position of a guide 93 to change the usable range of the cutting blade 92. This adjustment can be made by fixing or moving the pin 94.

[0070] Figure 9(A) shows a long hole configuration that improves cutting. The long hole is gourd-shaped, with the edge of the gourd serving as a blade. By placing a root vegetable at position 111 and retracting it to position 112, the remaining leaves are cut off. For safety reasons, there is a protective plate 113, which is closed when not in use. Figure 9(B) shows an oval hole 114, which can be used to place a root vegetable in the center and cut it by pulling it in either direction. There is also a protective plate 115. Figure 9(C) uses a mechanism that rotates cutting blade 116. Cutting is performed using a rotary blade powered by an electric motor 117.

[0071] Figure 10 shows a method for generating regenerative electricity from the discharge of residual leaves. The leaf regenerative electricity device 120 is located in a case above the leaf discharge chute 130, as shown in Figures 2, 3, and 11. A motor that generates regenerative electricity is located behind the rotating shaft 125. This device is characterized by its construction, consisting of blades 121 and 122 connected in the center by a spring-loaded hinge plate 123, allowing it to bend to one side. This configuration allows the blades 121 to rotate counterclockwise toward the rotating shaft 125 as the residual leaves 124 fall. While regenerative electricity is generated by the rotational force, the blades 121 are in contact with the case 126. Therefore, the case 126 generates vibrations. However, because the case 126 is connected to the leaf discharge chute 130, the vibrations are also transmitted to the leaf discharge chute 130, preventing leaves from becoming trapped in the chute. Figure 10(B) is a cross-sectional view of the leaf regenerative electricity device 120 from the rear. By folding the blades in this way, they can be arranged compactly, and the leaves can be discharged from the leaf discharge chute 130 so that they are closer to the right side of the vehicle body, which is ideal.

[0072] Figure 12 shows a configuration in which the ridge detection sensor 140 is placed on the weed dividing rod 27. When the weed dividing rod comes out of the ridge 141, the ridge detection sensor 140 changes from ON state 140A to OFF state 140B, and a warning sound (buzzer) sounds. If the main speed change lever 67 or lift operation lever 13 is operated while the warning sound is sounding, the warning sound will stop. If the warning sound continues for more than two seconds (when there is no lever operation), the main speed change lever 67 will return to the neutral position and the machine speed will stop.

[0073] Alternatively, the ridge detection sensor 140 may be located at a position at the same height as the ridge dividing rod 27 but away from it; either configuration is a mechanism that can detect the height of the ridge. [Explanation of symbols]

[0074] 19 Left and right clamping conveyor belt 24 Extraction and conveyance device 61 Spreading section 62 Spreading section 65 Foreign body collection case 70 Scraper 100 work vehicles A Running part B. Control Unit C. Harvesting section D Cut stem and leaf E Sorting and conveying section F Storage section

Claims

1. A path of a clamping and conveying unit located between a part where vegetables are pulled out from the soil in a farm field and a stem and leaf cutting unit that cuts the stems and leaves of the pulled vegetables, This work vehicle has a clamping and conveying section made up of two belt tiers, upper and lower, with a gap between them, and also has a widening section that partially widens the gap between the left and right belts of the upper and lower tiers, and has the function of removing foreign objects from the clamping and conveying mechanism.

2. 2. The work vehicle of claim 1, further comprising a foreign object collection case below a portion where foreign objects fall, at a widening portion that partially widens the gap between the left and right belts.

3. 3. The work vehicle according to claim 1, further comprising a scraper disposed in the gap between the left and right belts for striking against foreign objects and causing the foreign objects to fall from the clamping and conveying section.

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