JP2022160244A - Nursery box transport device and seeder - Google Patents

Abstract

To provide a nursery box transport device that enables a user to easily replace a transportation roller.SOLUTION: A transportation roller has a revolving shaft that can be separated into two parts, a first shaft part 4A and a second shaft part 4B, which enables the second shaft part 4B to which all of a plurality of rubber rolls 5 are fastened to be detachably attached to a transport device. By performing simple work of separating the second shaft part 4B from the first shaft part 4A by extracting a stop pin 8 and pulling out the separated second shaft part 4B, a user can remove the second shaft part 4B together with the rubber rolls 5 from the transport device and replace it with new one. As described above, enabling only one revolving shaft (second shaft part 4B) to which all of the plurality of rubber rolls 5 are fastened to be removed makes it possible, with a simple configuration, to implement replacement with respect to the transportation roller by the user.SELECTED DRAWING: Figure 7

Description

TECHNICAL FIELD The present invention relates to a seedling box conveying device for conveying seedling boxes, and a sowing machine equipped with the same.

Conventionally, there has been proposed a sowing machine that performs a series of various operations such as seeding, watering, and covering with soil for a nursery box (Patent Document 1). Seeding machines include, for example, a sowing device that supplies (seeds) seeds to a nursery box filled with bed soil, a watering device that waters the nursery box, and a cover soil supply device that puts cover soil into the nursery box. It is arranged along the conveying direction of the nursery box conveying device that conveys. As the apparatus described in Patent Document 1, there is a raising seedling box conveying apparatus that conveys the raising seedling box by rotating a conveying roller (driving roller). In this case, in order to improve the transport performance of the nursery box, a rubber roll with high frictional resistance is fixed to the rotating shaft of the transport roller.

JP 2017-147964 A

However, the rubber roll of the transport roller wears out with use or deteriorates over time, and the friction resistance with the nursery box may decrease. When the frictional resistance decreases, the seedling box slips on the rubber roll, making it difficult to transport the seedling box. Therefore, there has been a demand for a device that allows the user to easily replace the conveying roller, but no such device has been proposed yet.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a nursery box conveying device that allows a user to easily replace the conveying rollers, and a sowing machine equipped with the same.

A nursery box conveying device according to one embodiment of the present invention includes:
In the seedling box transport device (A) for transporting the seedling box (1),
a conveying roller (50) for conveying the seedling box;
a first frame (2A) provided on one side in the width direction intersecting the conveying direction of the seedling box;
a first bearing portion (51A) provided on the first frame and rotatably supporting the conveying roller;
a second frame (2B) provided on the other side in the width direction;
a second bearing portion (51B) that is provided on the second frame and rotatably supports the conveying roller;
The conveying roller includes a rotating shaft (4) rotatably supported by the first bearing portion and the second bearing portion, and a rotating shaft (4) attached to the rotating shaft and between the first frame and the second frame. and a roll unit (5) for conveying the seedling box at
The rotating shaft includes a second shaft portion (4B) to which the roll portion is attached, and a first shaft portion (4A) connected to the second shaft portion between the first frame and the second frame. and wherein the first shaft portion and the second shaft portion are configured to be separable,
It is characterized by

A hole (300) having a diameter equal to or larger than the diameter of the roll portion is formed in the second frame,
The second shaft portion is supported by the second frame via the second bearing portion so as to be inserted through the hole portion.

A driving force transmission means (80) for transmitting a driving force for rotationally driving the rotating shaft to the first shaft portion is provided.

The first shaft portion and the second shaft portion are connected to each other by a detachable stop member (8) in a fitted state.

The reference numerals in parentheses are for comparison with the drawings, but they do not affect the structure described in the claims.

According to the first aspect of the present invention, the conveying roller is detachably provided on the first shaft portion and the second shaft portion, and the second shaft portion to which the roll portion is attached is detachable from the nursery box conveying device. . In this way, by separating the first and second shafts, the user can remove the second shaft along with the roll from the seedling box conveying device and replace it with a new one. In this way, by separating the conveying roller into two and making it possible to remove only one of the rollers provided with the roll portion, it is possible to easily replace the conveying roller by the user with a simple configuration.

According to the second aspect of the present invention, the user can remove and replace the second shaft portion together with the roll portion simply by pulling out the separated second shaft portion.

According to the third aspect of the present invention, when replacing the conveying roller, it is not necessary to remove the first shaft portion provided with the driving force transmission means, so the user can easily replace the conveying roller.

According to the fourth aspect of the present invention, the user can easily separate the first shaft portion and the second shaft portion.

The side view which shows a sowing machine. FIG. 2 is a top view showing the transfer guide device of this embodiment; FIG. 2 is a top view showing the transfer guide device; The front view which shows a transfer guide apparatus. Sectional drawing which shows a transfer guide apparatus. FIG. 2 is a top view showing guide rails and conveying rollers; FIG. 4 is a view for explaining the attachment/detachment configuration of the guide rail and the conveying roller; The top view which shows a covering soil delivery apparatus and a seedling-raising-box transfer guide apparatus. An exploded view of a covering soil delivery device. The top view which shows a delivery conveyor. The side view which shows a delivery conveyor.

[First embodiment]
<Sower>
An embodiment of the present invention will be described below with reference to the drawings. First, a suitable sowing machine using the nursery box transfer guide device of the present embodiment will be described with reference to FIG. FIG. 1 shows an example of a sowing machine 100 that continuously performs a series of operations on a nursery box 1 . In this specification, unless otherwise specified, upstream and downstream refer to upstream and downstream in the conveying direction (arrow X direction) of the seedling box 1 conveyed by the conveying device A. Further, the direction intersecting the conveying direction of the seedling box 1 is referred to as the width direction. Further, when the sowing machine 100 is viewed from the upstream side in the conveying direction of the seedling box 1, it is called the front, and when it is viewed from the width direction, it is called the side.

As shown in FIG. 1, the seeding machine 100 of the present embodiment includes a transport device A for transporting the seedling box 1, a seedling box transport guide device (hereinafter simply referred to as a transport guide device B) described later, and a transport device A A sowing device C that sows seeds such as paddy rice seed rice in the nursery box 1 transported to a nursery box 1, a watering device D that sprinkles water on the nursery box 1 in which the seeds are sown, and a cover soil supply device that puts soil into the nursery box 1. E. The transfer guide device B, the sowing device C, the watering device D, and the cover soil supply device E are arranged in order from the upstream side so as to straddle the conveying path along which the seedling boxes 1 are conveyed in the conveying device A. The nursery box 1 that has been sown, watered and covered with soil by the sowing device C, the watering device D, and the soil supplying device E is transported to the rearmost end of the transporting device A. As shown in FIG.

The transfer guide device B, the sowing device C, the watering device D, and the cover soil supply device E are configured so that they can be installed in the conveying device A independently of other devices. Although not shown here, a bed soil supplying device for feeding bed soil into the nursery box 1 transported to the transport device A may be installed at the uppermost stream.

<Conveyor>
Next, the outline of the conveying apparatus A will be described using FIG. 2 while referring to FIG. As shown in FIG. 2, the conveying device A mainly has a pair of side frames (2A, 2B) and a plurality of conveying rollers 50. As shown in FIG. A plurality of conveying rollers 50 are provided on two side frames (2A, 2B) arranged in parallel so as to receive the seedling box 1 from below in the gravity direction and convey it in the conveying direction (arrow X direction). They are provided so as to line up along the conveying direction. The first side frame 2A has a plurality of first bearing portions 51A that rotatably support the conveying roller 50 at one end in the width direction, and the second side frame 2B supports the conveying roller 50 at the other end in the width direction. It has a second bearing portion 51B that is rotatably supported by the .

The conveying roller 50 is fixed around the rotating shaft 4 made of metal, for example, which is supported by the first bearing portion 51A and the second bearing portion 51B, and the rotating shaft 4 so as to rotate integrally with the rotating shaft 4. A rubber roll 5 having a large frictional resistance is provided as a roll portion for receiving and conveying the box 1 from below in the direction of gravity. The rubber rolls 5 are formed to have a diameter larger than that of the rotating shaft 4, and are arranged at least at the central portion and both end portions with a gap in the width direction. In order to prevent the central part of the bottom of the nursery box 1 from lowering than the end part during transportation, the rubber roll 5 fixed to the central part is formed wider than the rubber roll 5 fixed to the end part side. A drive gear portion 80 is attached to one end of the rotating shaft 4 to transmit the rotational driving force of a motor (not shown) in order to rotate the rotating shaft 4 .

As shown in FIG. 1, the transfer guide device B is arranged upstream of the seeding device C and between the watering device D and the soil cover supply device E (that is, upstream of the soil cover supply device E). That is, in the case of this embodiment, the transfer guide device B is used to transport the seedling box 1 to the seeding device C on the basis of central transportation, and to the soil covering supply device E to convey the nursery box 1 on the basis of central transportation. is provided. Conveying on the basis of the central conveyance means conveying the seedling box 1 while aligning the widthwise center of the seedling box 1 with the widthwise center of the conveying path along which the seedling box 1 is conveyed in the conveying apparatus A. .

<Transfer guide device>
Next, the transfer guide device B of this embodiment will be described in detail with reference to FIGS. 3 to 5. FIG. As shown in FIGS. 3 and 4, the transfer guide device B is provided with a first guide frame 10A on one side in the width direction, and a second guide frame 10B on the opposite side of the first guide frame 10A in the width direction. is provided. A first guide mechanism B1 is provided on the first guide frame 10A side, and a second guide mechanism B2 is provided on the second guide frame 10B side. The transfer guide device B is attached to the transport device A, the first guide frame 10A is attached to the first side frame 2A (see FIG. 2), and the second guide frame 10B is attached to the second side frame 2B (see FIG. 2) by bolts or the like. Fixed.

The first guide mechanism B1 has a first guide plate 11A, a first link arm 12A as first support means, a first slide shaft 14A, and a first compression spring 15A. The first guide plate 11A is biased toward the second guide plate 11B by a first compression spring 15A. The first guide plate 11A is movable in the conveying direction and the width direction of the seedling box 1 with respect to the first guide frame 10A by means of two first link arms 12A (first and second links). It is connected to the frame 10A. When the first guide plate 11A comes into contact with the seedling box 1, the two first link arms 12A constituting the parallel link mechanism move the first guide plate 11A in the conveying direction while moving toward the first guide frame 10A. The first guide plate 11A is swingably supported so as to return the first guide plate 11A to the original position before the contact when the nursery box 1 is moved and the seedling box 1 passes.

The second guide mechanism B2 may have the same configuration as the first guide mechanism B1, and includes a second guide plate 11B, a second link arm 12B as second support means, a second sliding shaft 14B, and a second pushing mechanism. and a spring 15B. The second guide plate 11B is provided so as to face the first guide plate 11A on the other side in the width direction, and is biased toward the first guide plate 11A by a second push spring 15B. The second guide plate 11B is movable relative to the second guide frame 10B in the conveying direction and the width direction of the seedling box 1 by two second link arms 12B (third and fourth links). It is connected to the frame 10B. When the second guide plate 11B comes into contact with the seedling box 1, the two second link arms 12B that make up the parallel link mechanism move the second guide plate 11B in the conveying direction while moving toward the second guide frame 10B. The second guide plate 11B is swingably supported so that the second guide plate 11B is returned to the original position before the contact when the raising seedling box 1 passes through.

The first guide plate 11A and the second guide plate 11B are arranged so that the gap between the first guide portion 111 and the third guide portion 113 in the width direction is narrower than the width of the seedling box 1 when the seedling box 1 is not present. In addition, it is provided so that the arrangement position in the width direction can be changed according to the width of the nursery box 1. - 特許庁To do so, the first guide mechanism B1 has first restricting means (14A, 211, 16) for restricting the distance between the first guide plate 11A and the first guide frame 10A, and the second guide mechanism B2 has second restricting means (14B, 211, 16) that restrict the distance between the second guide plate 11B and the second guide frame 10B.

In the first guide mechanism B1, a first sliding shaft 14A as a first protruding member is fixed to the first guide plate 11A and is provided movably in the width direction with respect to the first guide frame 10A. Further, in the second guide mechanism B2, the second slide shaft 14B as a second protruding member is fixed to the second guide plate 11B, and is provided movably in the width direction with respect to the second guide frame 10B. there is To do so, as shown in FIG. 5, the first guide frame 10A (second guide frame 10B) has a horizontally long hole 211 (second first elongated hole, second elongated hole) are formed. The horizontally long hole 211 is elongated in the transport direction so that the first slide shaft 14A (second slide shaft 14B) does not interfere with the movement of the first guide plate 11A (second guide plate 11B).

Further, as shown in FIG. 4, a plurality of through holes 141 are formed in the first sliding shaft 14A (second sliding shaft 14B) along the width direction, and the through holes 141 into which the stop pins 16 are inserted are changed. and can be attached to the guide frames (10A, 10B). The distance between the first guide plate 11A and the first guide frame 10A is regulated depending on which of the through holes 141 of the first slide shaft 14A the stop pin 16 is inserted (retaining position). , the amount of protrusion from the first guide frame 10A toward the first guide plate 11A changes. Further, the distance between the second guide plate 11B and the second guide frame 10B is regulated depending on which of the through holes 141 of the second sliding shaft 14B the stop pin 16 is inserted (retaining position). As a result, the amount of protrusion from the second guide frame 10B toward the second guide plate 11B changes. According to this amount of protrusion, the arrangement position of each guide plate (11A, 11B) in the width direction can be known. In addition, in the case of this embodiment, the first sliding shaft 14A is arranged on the inner periphery of the first compression spring 15A, and the second sliding shaft 14B is arranged on the inner periphery of the second compression spring 15B.

In the case of the present embodiment, as shown in FIG. 3, on the first guide plate 11A, on the upstream side of the first guide portion 111 in the conveying direction, there is positioned on the inner side in the width direction from the upstream side to the downstream side in the conveying direction. A second guide portion 112 is connected so as to be inclined. On the other hand, on the upstream side in the conveying direction of the third guide portion 113 in the second guide plate 11B, there is a fourth guide portion 114 which is inclined so as to be located inward in the width direction from the upstream side in the conveying direction to the downstream side. It is connected. The second guide portion 112 and the fourth guide portion 114 form introduction ports for introducing the nursery box 1 into the first guide portion 111 and the third guide portion 113 . The second guide part 112 and the fourth guide part 114 are arranged obliquely with respect to the conveying direction so that the width of the upstream end is larger than the width of the seedling box 1 . By doing so, the nursery box 1 can be easily introduced between the first guide portion 111 and the third guide portion 113 in the correct posture. Further, when the second guide part 112 and the fourth guide part 114 are pushed by the transported seedling box 1, the movement of the first guide plate 11A and the second guide plate 11B in the transport direction is controlled by the connecting shaft described later. It makes it easier to convert to 13 rotations.

<Interlocking mechanism>
In addition, the transfer guide device B of the present embodiment includes an interlocking mechanism 130 as an interlocking means that connects the first guide plate 11A and the second guide plate 11B and moves them in conjunction with the contact of the nursery box 1. have. The interlocking mechanism 130, as shown in FIGS. 3 and 4, has a connecting shaft 13 and two rotating arms (17A, 17B).

The connecting shaft 13 extends across the width direction and is rotatably provided on the guide frames (10A, 10B). In this embodiment, the guide frames (10A, 10B) are formed with holes through which the connecting shafts 13 pass, and the connecting shafts 13 inserted into the holes are fixed by the stop pins 16 so as not to come off.

Rotating arms ( 17 A, 17 B) formed in a long size are fixed to both ends of the connecting shaft 13 in the width direction so as to rotate together with the connecting shaft 13 . Further, these rotating arms (17A, 17B) are formed with holes through which the above-described sliding shafts (14A, 14B) pass. , 14B) are rotatable. In this manner, the rotating arms (17A, 17B) connect the connecting shaft 13 and the sliding shafts (14A, 14B).

As described above, since the sliding shafts (14A, 14B) are fixed to the guide plates (11A, 11B), the movement of the guide plates (11A, 11B) due to contact with the nursery box 1 causes the guide plates (11A, 11B) to move. , 11B). For example, when the seedling box 1 comes into contact with the first guide plate 11A and pushes the first guide plate 11A in the conveying direction, the first sliding shaft 14A moves together with the first guide plate 11A. The moving arm 17A rotates about the connecting shaft 13 as a rotation center. Since the first turning arm 17A is fixed to the connecting shaft 13, the turning of the first turning arm 17A causes the connecting shaft 13 to rotate. That is, the first rotating arm 17A can convert the reciprocating movement of the first guide plate 11A in the conveying direction and the rotation of the connecting shaft 13. As shown in FIG.

When the connecting shaft 13 rotates, the second rotating arm 17B fixed to the other end of the connecting shaft 13 rotates. When the second rotating arm 17B rotates, the second sliding shaft 14B moves. Then, the second guide plate 11B fixed to the second sliding shaft 14B moves. In this way, when the first guide plate 11A and the second guide plate 11B are pushed in the transport direction by the transported seedling box 1, the interlocking mechanism 130 moves the transport direction and the width direction (side surface side). It is interlocked in such a way that Even if only one of the guide plates (11A, 11B) is in contact with the seedling box 1, the movement of either one of the guide plates (11A, 11B) in contact with the seedling box 1 is interlocked. The other guide plate (11A, 11B) is made movable.

As described above, in this embodiment, when the guide plates (11A, 11B) are pushed by the transported seedling box 1 and move in the transport direction, the guide plates (11A, 11B) also move in the width direction. linked in such a way as to That is, both guide plates (11A, 11B) are interlocked in the width direction so as to be spread by the seedling box 1 so that the distance between the two guide plates (11A, 11B) corresponds to the width of the seedling box 1. to move. As a result, the center of the raising seedling box 1 in the width direction is kept substantially aligned with the center of the conveying path of the conveying device A, and the raising seedling box 1 is conveyed. At this time, both guide plates (11A, 11B) are moved in the width direction while escaping in the conveying direction by the seedling box 1, so that the center of the seedling box 1 is placed in the conveying path of the conveying device A without difficulty. can be positioned at a position substantially corresponding to the center of the Thus, in this embodiment, since the guide plates (11A, 11B) move simultaneously with contact with the seedling box 1, the guide plates (11A, 11B) move the seedling box 1 even if the seedling boxes 1 have different widths. It moves in parallel along the pair of guide frames (10A, 10B) while being clamped. Therefore, even if the width of the raising seedling box 1 is different, the raising seedling box 1 can be conveyed by center-based conveyance by guiding the raising seedling box 1 to the center side without adjusting the position of the guide plates (11A, 11B).

In the case of the above-described embodiment, the conveying device A for conveying the seedling box 1 is not limited to the conveying roller 50 described above. You may use the belt conveyor etc. which carry out.

[Second embodiment]
<Transport roller>
By the way, as described above, when the transport roller 50 is used to transport the seedling box 1, the rubber roll 5 of the transport roller 50 wears or deteriorates over time due to use, causing friction with the seedling box 1. resistance can be lowered. When the frictional resistance decreases, the seedling box 1 slips on the rubber roll 5, making it difficult to transport the seedling box 1. - 特許庁Therefore, it is preferable that the user can easily replace the conveying roller 50 . A configuration for easily replacing the conveying roller 50 by the user will be described below with reference to FIGS. 6 and 7. FIG.

As shown in FIG. 6, the conveying roller 50 has a rotating shaft 4 and a plurality of rubber rolls 5, and is attached to bearings (51A, 51B) provided on the side frames (2A, 2B) at both ends in the conveying direction. supported. In the case of this embodiment, the conveying roller 50 is formed to be separable into two. As shown in FIG. 7, the conveying roller 50 of this embodiment can be separated into a first shaft portion 4A supported by a first bearing portion 51A and a second shaft portion 4B supported by a second bearing portion 51B. is provided in

A fitting hole is formed at the tip of the second shaft portion 4B on the side of the first shaft portion 4A at the center of the axis, and the tip of the first shaft portion 4A on the side of the second shaft portion 4B can be fitted into the fitting hole. A fitting protrusion 7 is formed. A second pin insertion hole 6B communicating with the fitting hole is formed in the second shaft portion 4B, and a first pin insertion hole 6A is formed in the fitting protrusion 7 of the first shaft portion 4A. . The first pin insertion hole 6A and the second pin insertion hole 6B substantially coincide with each other when the fitting convex portion 7 is fitted into the fitting hole of the second shaft portion 4B. The first shaft portion 4A and the second shaft portion 4B are connected by passing a stop pin 8 (stop member) through the first pin insertion hole 6A and the second pin insertion hole 6B that are substantially aligned. rotatable integrally. On the contrary, by removing the stop pin 8, the first shaft portion 4A and the second shaft portion 4B are disconnected and can be separated.

A first bearing portion 51A that pivotally supports the first shaft portion 4A is fixed to the first side frame 2A (first frame) by bolts or the like, and the first shaft portion 4A can be separated from the second shaft portion 4B even if the first shaft portion 4A is separated from the second shaft portion 4B. It remains on the first side frame 2A while being pivotally supported by the one bearing portion 51A. The first shaft portion 4A is provided with a driving gear portion 80 as a driving force transmission means for transmitting rotational driving force from a motor (not shown) or the like to the first shaft portion 4A. This is because, if it is detachable, then work such as gear engagement must be performed, which is not easy. The drive gear portion 80 is provided outside the first side frame 2A, which is further apart from the second side frame 2B (second frame) than the first side frame 2A in the width direction. In addition, in order to facilitate connection of the first shaft portion 4A and the second shaft portion 4B by the stop pin 8, the first shaft portion 4A and the second shaft portion 4B are separated from the driving gear portion 80 and the first side in the width direction. It is provided so as to be connectable inside the first side frame 2A, which is on the opposite side across the frame 2A. The second shaft portion 4B is rotated via the first shaft portion 4A according to the rotational driving force transmitted by the driving gear portion 80 while being connected to the first shaft portion 4A.

And, in the case of this embodiment, all the rubber rolls 5 are fixed to the second shaft portion 4B. That is, when the first shaft portion 4A and the second shaft portion 4B are separated, all the rubber rolls 5 are attached to the second shaft portion 4B side, and none of the rubber rolls 5 are attached to the first shaft portion 4A side. . Therefore, the second shaft portion 4B and the rubber roll 5 are integrated with the second side frame 2B in the width direction in a state in which the connection between the first shaft portion 4A and the second shaft portion 4B is released. It is removed from the conveying device A (specifically, the second side frame 2B) by being slid away from the shaft portion 4A. In addition, the second side frame 2B has a rubber roll 5 through which the rubber roll 5 can pass so that the rubber roll 5 does not hit the second side frame 2B and hinder the sliding movement when the second shaft portion 4B is slid. An attachment/detachment hole 300 (hole) having a diameter equal to or larger than the diameter is formed.

A fixing plate 90 is attached to the second bearing portion 51B to close the attachment/detachment hole 300, and the second bearing portion 51B is fixed to the second side frame 2B via the fixing plate 90 with a bolt or the like. be. That is, the second shaft portion 4B is supported by the second side frame 2B via the second bearing portion 51B so as to be inserted through the attachment/detachment hole 300. As shown in FIG. Therefore, when the second shaft portion 4B is slid to be attached or detached, it is necessary to remove the second bearing portion 51B together with the fixing plate 90 from the second side frame 2B in advance.

As described above, in the present embodiment, the rotary shaft 4 of the conveying roller 50 is provided in two so as to be separable (connectable), and the second shaft portion 4B to which all of the plurality of rubber rolls 5 are fixed is attached to and detached from the conveying device A. made it possible. The user pulls out the stop pin 8 to separate the first shaft portion 4A and the second shaft portion 4B, and pulls out the separated second shaft portion 4B. At the same time, the second shaft portion 4B can be removed and replaced with a new one. In this way, the rotating shaft 4 of the conveying roller 50 is separated into two, and only one of the rotating shafts (the second shaft portion 4B) to which all the rubber rolls 5 are fixed can be removed. Easy replacement of the roller 50 can be realized with a simple configuration.

[Other embodiments]
Next, the soil covering supply device E will be described with reference to FIGS. 8 to 11. FIG. As shown in FIG. 8, the cover soil supply device E is arranged so as to straddle the transport path along which the seedling boxes 1 (see FIG. 1) are transported in the transport device A, and the seedling boxes 1 transported by the transport device A are covered with soil. supply.

As shown in FIG. 9 , the soil covering supply device E is roughly composed of a soil covering frame 20 , a delivery conveyor 21 and a soil covering hopper 22 . Covered soil is stored in the covered soil hopper 22, and an outlet for discharging the covered soil is formed below in the direction of gravity. A shutter (not shown) for opening and closing the discharge port is appropriately opened and closed in accordance with the transport timing of the nursery box 1, so that the covering soil is discharged from the discharge port. However, a delivery conveyor 21 is arranged below the soil covering hopper 22 so that the covering soil discharged from the soil covering hopper 22 is not directly supplied to the nursery box 1 . That is, the covered soil discharged from the covered soil hopper 22 falls onto the delivery conveyor 21 and is transported by the delivery conveyor 21 in the transport direction (arrow X direction). Then, the cover soil conveyed to the delivery conveyor 21 drops downward from the rearmost end of the delivery conveyor 21 in the transport direction and is supplied to the seedling box 1 . By supplying the cover soil via the delivery conveyor 21 in this manner, it is possible to supply the cover soil evenly over the entire seedling box 1 and to have an appropriate thickness.

The delivery conveyor 21 is detachably attached to the soil covering hopper 22 and the soil covering frame 20 . In the case of this embodiment, as shown in FIG. 9, the soil covering frame 20 can hold the delivery conveyor 21, and the soil covering frame 20 is fixed to the soil covering hopper 22 using screws or the like while holding the delivery conveyor 21. . In this way, by holding the delivery conveyor 21 on the soil covering frame 20 fixed to the soil covering hopper 22 using screws or the like, the delivery conveyor 21 can be easily attached to and detached from the soil covering hopper 22 . The delivery conveyor 21 may be attached and detached by removing the soil-covering hopper 22 from the soil-covering frame 20 while the soil-covering frame 20 is fixed to the conveying device A.

As shown in FIG. 10, the delivery conveyor 21 includes an endless conveyor belt 26, and a drive roller 24 and a driven roller 25 on which the conveyor belt 26 is stretched in order to convey the covered soil in the conveying direction. have. In this embodiment, a drive roller 24 that is driven by a motor (not shown) to rotate a conveyor belt 26 is arranged upstream in the conveying direction (direction of arrow X), and a driven roller 25 that is driven by the rotation of the conveyor belt 26 is arranged downstream. placed on the side.

These driving rollers 24 and driven rollers 25 are arranged to keep the conveyor belt 26 in a predetermined position in order to prevent the rotating conveyor belt 26 from loosening and coming off, and to suppress vibration of the rotating conveyor belt 26 . It is stretched by tension. In addition, a belt receiver 27 is provided for contacting and supporting the inner circumference of the conveyor belt 26 . As shown in FIG. 9, support portions 27a are erected in the direction of gravity at both ends of the belt receiver 27 in the width direction.

Since the conveyor belt 26 is conveyed with covering soil on it, it deteriorates more quickly than other members. Therefore, the delivery conveyor 21 is provided with a replaceable conveyor belt 26 . However, when the operator replaces the conveyor belt 26, if the conveyor belt 26 is still under the above-described predetermined tension by the driving roller 24 and the driven roller 25, the conveyor belt 26 is difficult to remove. Also, it is difficult to install a new conveyor belt 26 . In other words, it is difficult for the operator to replace the conveyor belt 26 . Therefore, in this embodiment, the operator can easily replace the conveyor belt 26 .

As shown in FIGS. 10 and 11, in the case of this embodiment, the drive roller 24 is rotatably supported at both ends in the width direction by an elongated fixed roll arm 28 extending in the conveying direction. . The fixed roll arm 28 is fixed by a fixing bolt 31 to support portions 27a erected in the direction of gravity at both ends in the width direction of the belt receiver 27 downstream of the driving roller 24 in the conveying direction (direction of arrow X). It is

On the other hand, the driven roller 25 is supported by a long rotating roll arm 29 extending in the transport direction at both ends in the width direction. The rotating roll arm 29 is provided on the support portion 27a of the belt receiver 27 upstream of the driven roller 25 in the conveying direction (the direction of the arrow X) so as to be rotatable about a rotating support shaft 30. . The rotating support shaft 30 is provided near the center between the driven roller 25 and the drive roller 24 in the transport direction.

The rotating roll arm 29 is fixed to the supporting portion 27a by a detachable mounting bolt 32 between the driven roller 25 and the rotating support shaft 30 in the conveying direction. Therefore, unless the mounting bolt 32 is removed, the rotary roll arm 29 cannot be rotated. As described above, the driven roller 25 (specifically, the bearing portion 34 that supports the rotary shaft 25a) is supported by the rotating roll arm 29. Therefore, when the rotating roll arm 29 rotates, the driven roller 25 also rotates.

Further, the driven roller 25 is provided so as to be able to come into contact with and separate from the drive roller 24 . Specifically, the bearing portion 34 of the driven roller 25 can reciprocate in the conveying direction by means of a conveyor adjusting screw 33 (see FIG. 10). In this way, the distance between the shafts of the driven roller 25 and the drive roller 24 can be adjusted according to the tightening amount of the conveyor adjusting screw 33, so that the tension applied to stretch the conveyor belt 26 can be changed. In the case of this embodiment, as the conveyor adjusting screw 33 is tightened, the amount of tightening increases, and the distance between the driven roller 25 and the drive roller 24 decreases accordingly. tension weakens.

When the operator replaces the conveyor belt 26 in the delivery conveyor 21, the worker removes the mounting bolt 32 to make the rotary roll arm 29 and the driven roller 25 rotatable. In addition, the conveyor adjustment screw 33 is tightened to weaken the tension for stretching the conveyor belt 26 . Then, by rotating the driven roller 25 with the rotation support shaft 30 as a fulcrum, the conveyor belt 26 is loosened further, making it easier for the operator to remove the conveyor belt 26 from the driven roller 25 and the drive roller 24 . When attaching a new conveyor belt 26, the operator can remove it and perform the above-described procedure in reverse order. As described above, in the present embodiment, the above-described simple structure allows the operator to easily replace the conveyor belt 26 .

2A... First side frame (first frame)
2B: second side frame (second frame)
4 Rotating shaft 4A First shaft portion 4B Second shaft portion 5 Rubber roll 8 Stop pin (stop member)
50 Conveying roller 51A First bearing portion 51B Second bearing portion 80 Driving gear portion (driving force transmission means)
300: Attachment/detachment hole (hole)
A: Raising seedling box conveying device (conveying device)
C... seeding device

Claims (5)

In the seedling box transport device for transporting the seedling box,
a conveying roller for conveying the seedling box;
a first frame provided on one side in the width direction intersecting the conveying direction of the seedling box;
a first bearing provided on the first frame for rotatably supporting the conveying roller;
a second frame provided on the other side in the width direction;
a second bearing provided on the second frame and rotatably supporting the conveying roller;
The conveying roller includes a rotating shaft rotatably supported by the first bearing portion and the second bearing portion, and a rotating shaft attached to the rotating shaft, between the first frame and the second frame. and a roll unit that conveys the seedling box,
The rotating shaft has a second shaft portion to which the roll portion is attached, and a first shaft portion connected to the second shaft portion between the first frame and the second frame, The first shaft portion and the second shaft portion are configured to be separable,
A nursery box conveying device characterized by: A hole having a diameter equal to or larger than the diameter of the roll portion is formed in the second frame,
The second shaft portion is supported by the second frame via the second bearing portion so as to be inserted through the hole,
The nursery box conveying apparatus according to claim 1, characterized in that: A driving force transmission means for transmitting a driving force for rotationally driving the rotating shaft to the first shaft portion,
3. The nursery box conveying apparatus according to claim 1 or 2, characterized in that: The first shaft portion and the second shaft portion are connected by a detachable stop member in a mutually fitted state,
The nursery box conveying apparatus according to any one of claims 1 to 3, characterized in that: A nursery box conveying device according to any one of claims 1 to 4;
a seeding device that sows seeds in the seedling box conveyed by the seedling box conveying device,
A seeding machine characterized by:

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