JP2014084182A - Continuous unloader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous unloader that can reduce vibration and noise generated in a bucket elevator.SOLUTION: A first chain 25a and a second chain 25b of a bucket elevator 9 of a continuous unloader 1 are roller chain types having a plurality of pins 53 arranged in a longitudinal direction. When assuming any virtual plane perpendicular to the traveling direction W of the first and second chains 25a, 25b as a reference plane S1, the pins 53 are disposed so that a distance L1 from the pin 53a of the first chain 25a, which is positioned before the traveling direction W more than the reference plane S1 and closest to the reference plane S1, to the reference plane S1 is differentiated from the distance from the pin 53b of the second chain 25b, which is positioned before the traveling direction W more than the reference plane S1 and closest to the reference plane S1, to the reference plane S1.

Description

  The present invention relates to a bucket elevator type continuous unloader.

  Conventionally, a bucket elevator described in Patent Document 1 below is known as a technique in such a field. This bucket elevator is provided with a chain bucket that moves endlessly in the elevator shaft. The chain bucket has two chains that are circulated by a plurality of drive rollers, and a number of buckets that are attached so as to be suspended between the two chains. In the lower part of the bucket elevator, a large number of circulating buckets scrape and load the bulk load, so that the bulk load can be continuously conveyed.

JP 2001-253547 A

  In this type of bucket elevator type continuous unloader, it is desired to increase the speed of the chain bucket in order to increase the cargo handling capacity. However, if the speed of the chain bucket is increased, vibration and noise generated in the bucket elevator will increase. Therefore, in order to improve the cargo handling capacity by increasing the speed of the chain bucket, it is required to reduce the vibration and noise of the bucket elevator.

  In view of this problem, an object of the present invention is to provide a continuous unloader that can reduce vibration and noise generated in a bucket elevator.

  The continuous unloader of the present invention is a bucket elevator type continuous unloader including a bucket elevator that continuously conveys an object, and the bucket elevator includes a plurality of buckets for scraping and loading an object, and a plurality of buckets. A pair of first and second endless chains that are held by both ends, a driving roller that drives and circulates the first and second endless chains, and guides the first and second endless chains, respectively, A pair of turning rollers that respectively change the traveling direction of the second endless chain, and the first and second endless chains are a roller chain type having a plurality of pins arranged in the longitudinal direction, And an arbitrary virtual plane perpendicular to the traveling direction of the second endless chain as a reference plane, the reference is located in front of the reference plane and in the traveling direction. The distance from the pin of the first endless chain closest to the reference plane to the reference plane, the distance from the pin of the second endless chain closest to the reference plane located in front of the reference plane to the reference plane, The pins of the first and second endless chains are arranged so as to be different from each other.

  In this continuous unloader, roller chain type first and second endless chains are employed. When the rotating chain is guided by the turning roller, it is considered that vibration and noise peaks occur when a roller or the like formed at the pin position of the chain collides with the turning roller. Here, in the above-described continuous unloader, there are places where the positions of the pins from the reference plane are different from each other in the first and second endless chains. Therefore, when at least the above-mentioned portions of the first and second endless chains contact the turning roller, only one of the endless chain rollers or the like collides with the turning roller. Therefore, at least in the above locations, the vibration and noise peaks generated by the collision of the first and second endless chains can be avoided from overlapping at the same time in the two chains, thereby reducing the vibration and noise of the bucket elevator. can do.

  As a specific configuration, the first and second endless chains may have the same chain pitch and may have different phases at positions where they contact the turning roller. According to this configuration, the rollers of the first and second endless chains that circulate collide with the turning rollers alternately. Therefore, the vibration and noise peaks generated by the collision of the first and second endless chains do not overlap at the same time in the two chains, and as a result, vibration and noise can be reduced.

  As a more specific configuration, the phases of the first and second endless chains at positions where they contact the turning roller may be shifted from each other by ½ pitch.

  Further, the first and second endless chains may have different chain pitches.

  The continuous unloader of the present invention includes a connection mechanism that connects the endless chain and the bucket, and the connection mechanism is connected to one pin of the endless chain and fixed to the bucket, and the other endless chain. A second link connected to the first link and connected to the first link. According to this configuration, even when the endless chain is bent and travels, the bucket follows the bending track and is smoothly conveyed.

  Further, the continuous unloader of the present invention includes a first connection portion that connects the first endless chain and one end side of the bucket, and a second connection portion that connects the second endless chain and the other end side of the bucket. And the bucket has a plane-symmetric shape with reference to a virtual plane located between the first endless chain and the second endless chain, and the connection position between the first connection portion and the bucket The connection position between the second connection portion and the bucket may be a position that is plane-symmetric with respect to the virtual plane.

  According to this configuration, the plane-symmetric bucket is supported by the first and second endless chains at the plane-symmetrical positions, so that the bucket is stably supported.

  According to the continuous unloader of the present invention, vibration and noise generated in the bucket elevator can be reduced.

It is a figure which shows the continuous unloader which concerns on embodiment of this invention. It is a partially broken perspective view which shows the bucket elevator upper part of the continuous unloader of FIG. It is a partially broken sectional view which shows the principal part of the chain of the continuous unloader of FIG. It is a top view which shows the bucket vicinity of the state attached to the chain. (A) is a front view which shows the positional relationship of a 1st chain and a bucket, (b) is a front view which shows the positional relationship of a 2nd chain and a bucket. 2 is a graph showing an acceleration response of a first turning roller, an acceleration response of a second turning roller, and an acceleration response of the entire bucket elevator in the continuous unloader of FIG. 1. (A) is a front view which shows the positional relationship of a 1st chain and a bucket, (b) is a front view which shows the positional relationship of a 2nd chain and a bucket. 8 is a graph showing an acceleration response of the first turning roller, an acceleration response of the second turning roller, and an acceleration response of the entire bucket elevator in the continuous unloader of FIG.

  Hereinafter, embodiments of a continuous unloader according to the present invention will be described in detail with reference to the drawings.

  A bucket elevator type continuous unloader (CSU) 1 for vessels shown in FIGS. 1 and 2 is a device that continuously unloads bulk loads M (for example, coke and ore) from a ship's hold 103. The continuous unloader 1 includes a traveling frame 2 that can move along the quay 101 by two rails 3 a laid in parallel to the quay 101. On the traveling frame 2, a turning frame 5 is supported so as to be able to turn, and a bucket elevator 9 is supported on a tip portion of a boom 7 projecting laterally from the turning frame 5. The bucket elevator 9 is configured to maintain the vertical position by the balancing lever 12 and the counterweight 13 regardless of the undulation angle of the boom 7.

  The continuous unloader 1 includes a cylinder 15 for adjusting the undulation angle of the boom 7. When the cylinder 15 is extended, the boom 7 is upward and the bucket elevator 9 is raised, and when the cylinder 15 is contracted, the boom 7 is downward and the bucket elevator 9 is lowered.

  The bucket elevator 9 is configured to continuously excavate and scrape the bulk load M in the hold 103 by the side surface excavation type scraper 11 provided at the lower portion thereof, and to transport the scraped bulk load M upward. It is.

  The bucket elevator 9 includes an elevator main body 23 that constitutes the elevator shaft 21, and a chain bucket 29 that rotates around the elevator main body 23. The chain bucket 29 includes a pair of roller chains (endless chain) 25 connected in an endless manner, and a plurality of buckets 27 supported at both ends by the pair of chains 25. Specifically, the two chains 25 are juxtaposed in a direction perpendicular to the paper surface of FIG. 1, and each bucket 27 is suspended between the two chains 25 as shown in FIG. In this manner, the chain 25 is attached to the chain 25 via a predetermined fixture.

  Further, the bucket elevator 9 includes drive rollers 31a, 31b, and 31c around which the chain 25 is bridged, and a turning roller 33 that guides the chain 25. The driving roller 31 a is provided at the uppermost part 9 a of the bucket elevator 9, the driving roller 31 b is provided at the front part of the scraping part 11, and the driving roller 31 c is provided at the rear part of the scraping part 11. The turning roller 33 is a driven roller located slightly below the driving roller 31a, and guides the chain 25 and changes the traveling direction of the chain 25. Further, a cylinder 35 is interposed between the driving roller 31b and the driving roller 31c. By extending and contracting the cylinder 35, the distance between the axes of the both driving rollers 31b and 31c is changed, so that the chain bucket 29 The moving orbit can be changed. Corresponding to the presence of two chains 25, there are also two drive rollers 31a, 31b, 31c and two turning rollers 33, respectively, which are arranged in parallel in a direction perpendicular to the paper surface of FIG.

  The drive rollers 31 a, 31 b, and 31 c drive the chain 25, so that the chain 25 rotates around the elevator main body 23 in a direction indicated by the arrow W, and the chain bucket 29 is connected to the uppermost portion 9 a of the bucket elevator 9. It circulates around the scraping part 11 while moving around.

  The bucket 27 of the chain bucket 29 ascends with its opening 27a facing upward. And in the uppermost part 9a of the bucket elevator 9, when passing the drive roller 31a, the chain 25 changes direction from upward to downward, and the opening 27a of the bucket 27 turns downward. A discharge chute 36 is formed below the opening 27a of the bucket 27 that faces downward as described above. The lower end of the discharge chute 36 is connected to a rotary feeder 37 disposed on the outer periphery of the bucket elevator 9.

  The rotary feeder 37 conveys the loose load M carried out from the discharge chute 36 to the boom 7 side. A boom conveyor 39 is disposed on the boom 7, and the boom conveyor 39 supplies the bulk load M transferred from the rotary feeder 37 to the hopper 41. Below the hopper 41, an in-machine belt feeder 43 and an in-machine conveyor 45 are arranged.

  The landing of the loose load (object) M using the continuous unloader 1 is performed as follows. The scraping portion 11 at the lower end of the bucket elevator 9 is inserted into the hold 20 and the chain 25 is rotated in the direction of the arrow in the figure. If it does so, the bucket 27 located in the scraping part 11 will excavate and scrape the bulk load M, such as a coke and an ore, continuously. Then, the loose load M scraped and loaded in these buckets 27 is conveyed vertically upward to the uppermost portion 9 a of the bucket elevator 9 as the chain 25 rises.

  After that, the bucket 27 passes through the position of the drive roller 31 a and the bucket 27 rotates so that the loose load M falls from the bucket 27. The bulk M dropped from the bucket 27 falls into the discharge chute 36 and is carried out to the rotary feeder 37 side, and is further transferred to the boom conveyor 39 and conveyed to the hopper 41. Further, the loose load M is carried out to the ground side equipment 49 via the belt feeder 43 and the in-machine conveyor 45. The above operations are repeatedly performed using the plurality of buckets 27, whereby the loose load M in the hold 103 is continuously landed.

  Subsequently, the configuration of the turning roller 33 and the chain 25 of the bucket elevator 9 and the attachment structure of the bucket 27 will be described in more detail. As described above, the bucket elevator 9 includes two chains 25 that circulate in parallel tracks. In the following description, when the two chains 25 are distinguished, they are referred to as a first chain 25a and a second chain 25b, respectively. In order to distinguish the two turning rollers 33, the one that contacts the first chain 25a is referred to as the first turning roller 33a, and the one that contacts the second chain 25b is referred to as the second turning roller 33b. .

  As shown in FIG. 2, the turning roller 33 contacts the chain 25 that travels downward after being turned back by the driving roller 31a, and bends the chain 25 toward the inside of the circulation locus. The turning roller 33 changes the traveling direction of the chain 25 after being turned back by the driving roller 31a from the obliquely downward direction to the vertically downward direction. According to this configuration, the bucket 27 that has released the loose load M after being turned back moves obliquely downward so as to avoid the discharge chute 36 between the driving roller 31a and the turning roller 33, so the upper bucket It is difficult to interfere with the bulk M falling from 27. Therefore, the loose load M that continuously falls from each bucket 27 is smoothly introduced into the discharge chute 36. In this way, the bending of the circulation path of the chain 25 by the turning roller 33 contributes to the smooth movement of the loose load M to the discharge chute 36. The two turning rollers 33a and 33b are arranged to rotate around the same rotation axis.

  As shown in FIG. 3, a roller chain type is adopted as the chain 25. The pitch of the roller chain used as the chain 25 is, for example, 200 to 300 mm. The chain 25 has a structure in which outer plates 51 and inner plates 52 are alternately connected in the longitudinal direction. The chain 25 includes a pin 53 fixed to the pair of outer plates 51, a cylindrical bush 54 that is fixed to the pair of inner plates 52 and through which the pin 53 is inserted, and a cylindrical shape that is loosely fitted to the outside of the bush 54. And a roller 55. The first chain 25a and the second chain 25b are arranged in parallel, and a large number of buckets 27 are supported at both ends by the first chain 25a and the second chain 25b.

  Here, the present inventors have found that the turning roller 33 is involved as a relatively large vibration source and noise source due to the collision with the chain 25 with respect to vibration and noise generated in the bucket elevator 9. Therefore, in order to reduce vibration and noise caused by the turning roller 33, the bucket elevator 9 has a configuration described below.

  FIG. 4 is a plan view showing the vicinity of the bucket 27 attached to the first chain 25a and the second chain 25b. FIG. 5A shows the attachment state of the bucket 27 to the first chain 25a. It is the front view seen from the sequence direction (arrow V direction of FIG. 4) of the chain 25. FIG. 5B is a front view of the state in which the bucket 27 is attached to the second chain 25b as viewed from the direction in which the two chains 25 are arranged (the direction of the arrow V in FIG. 4).

  In the bucket elevator 9 of the continuous unloader 1, when an arbitrary virtual plane orthogonal to the traveling direction W of the first chain 25a and the second chain 25b is used as a reference plane, the bucket elevator 9 is positioned in front of the traveling direction W with respect to the reference plane. The distance from the pin of the first chain 25a closest to the reference surface to the reference surface, and the distance from the pin of the second chain 25b closest to the reference surface to the reference plane and located in front of the reference surface The pins of the first chain 25a and the second chain 25b are arranged so that there are different reference surfaces.

  For example, in the example shown in FIG. 4, the reference plane orthogonal to the traveling direction W of the first chain 25a and the second chain 25b is shown as the reference plane S1. The reference plane S1 is also orthogonal to the paper surface of FIG. In this case, the distance L1 from the pin (labeled “53a”) of the first chain 25a that is located in front of the reference plane S1 in the traveling direction W and closest to the reference plane S1 to the reference plane S1, and the reference plane S1 Further, the distance L2 from the pin of the second chain 25b (labeled with “53b”) closest to the reference plane S1 and positioned in front of the traveling direction W is different from the reference plane S1.

  In other words, in the bucket elevator 9 of the continuous unloader 1, when viewed from the arrangement direction of the first chain 25a and the second chain 25b (arrow V direction), the pin 53 and the second chain of the first chain 25a It arrange | positions so that the location which the pin 53 of the chain 25a does not overlap may exist.

  As a specific example of the configuration that satisfies the above condition, the first chain 25a and the second chain 25b have the same chain pitch p, and the first chain 25a and the second chain 25b are in the traveling direction W. It is attached to the bucket 27 in a state where it is displaced by a predetermined phase (here, half pitch (p / 2)). According to this configuration, the first chain 25a and the second chain 25b are out of phase by a half pitch at the position where they contact the turning rollers 33a and 33b. Therefore, the timing at which the roller 55 of the first chain 25a collides with the turning roller 33a and the timing at which the roller 55 of the second chain 25b collides with the turning roller 33b are shifted by a half pitch.

  As shown in FIG. 5, the continuous unloader 1 includes a connection mechanism (first connection portion) 61 that connects the first chain 25 a and one end of the bucket 27, and the other end of the second chain 25 b and the bucket 27. And a connection mechanism (second connection portion) 62 for connecting the two. The connection mechanism 61 includes a link arm 61a (first link) and a link arm 61b (second link). The base end side of the link arm 61a is connected to one pin (reference numeral 53c) of the first chain 25a, and the distal end side of the link arm 61a is rearward along the traveling direction W of the first chain 25a. It is bent toward. And the front end side extended in the advancing direction W among the link arms 61a is fixed to one side surface of the bucket 27 using a plurality of bolts 61f. A connection position 61 d between the link arm 61 a and the bucket 27 is a central portion of the bucket 27 in the traveling direction W.

  The proximal end side of the link arm 61b is connected to the other pin (referenced by “53d”) of the first chain 25a, and the distal end side of the link arm 61b is connected to the distal end side of the link arm 61a. Since the link arm 61a is hinge-coupled to the pin 53c and the link arm 61b is hinge-coupled to the pin 53d, the link arms 61a and 61b are rotatable with respect to the first chain 25a. Further, the tip of the link arm 61a and the tip of the link arm 61b are hinge-coupled by a hinge portion 61c.

  Similar to the connection mechanism 61, the connection mechanism 62 includes a link arm 62a (first link) and a link arm 62b (second link). The base end side of the link arm 62a is connected to one pin (reference numeral 53e) of the second chain 25b, and the distal end side of the link arm 62a is rearward along the traveling direction W of the second chain 25b. It is bent toward. And the front end side which extends in the advancing direction W among the link arms 62a is fixed to the other side surface of the bucket 27 using a plurality of bolts 62f. A connection position 62 d between the link arm 62 a and the bucket 27 is a central portion of the bucket 27 in the traveling direction W.

  The base end side of the link arm 62b is connected to the other pin (referenced by “53f”) of the second chain 25b, and the tip end side of the link arm 62b is connected to the tip end side of the link arm 62a. Since the link arm 62a is hinge-coupled to the pin 53e and the link arm 62b is hinge-coupled to the pin 53f, the link arms 62a and 62b are rotatable with respect to the second chain 25b. Further, the tip of the link arm 62a and the tip of the link arm 62b are hinge-coupled by a hinge portion 62c. With such a support structure of the bucket 27, even when the traveling first chain 25a and second chain 25b bend on the track, the bucket 27 follows the bent track and is smoothly conveyed.

  Further, as shown in FIG. 4, the bucket 27 is plane-symmetric with respect to a virtual plane (labeled “S2”) located in the middle between the track of the first chain 25a and the track of the second chain 25b. It has a shape. The virtual plane S2 is a plane orthogonal to the arrangement direction of the two chains 25, and is orthogonal to the paper surface of FIG. The first chain 25a and the second chain 25b attached to the bucket 27 are attached with a shift of a half pitch in the traveling direction W and are asymmetric with respect to the virtual plane S2.

  The connection position 61d between the link arm 61a and the bucket 27 and the connection position 62d between the link arm 62a and the bucket 27 are positions that are plane-symmetric with respect to the virtual plane S2, and both are in the traveling direction W. It is the central part of the bucket 27. In order to realize such a configuration, the connection mechanism 61 and the connection mechanism 62 have an asymmetric shape with respect to the virtual plane S2. According to this configuration, since the bucket 27 having a plane-symmetric shape is both supported by the first chain 25a and the second chain 25b at a plane-symmetrical position, the bucket 27 is stably supported.

  The effect based on the structure of such a chain 25 is demonstrated.

  When the first chain 25a and the second chain 25b that are circulated are guided by the turning rollers 33a and 33b, respectively, vibration and vibration occur when the roller 55 formed around the pin 53 collides with the turning rollers 33a and 33b. It seems that noise peaks occur. Therefore, as illustrated in FIG. 6, the peak of the acceleration response in the turning rollers 33 a and 33 b appears periodically corresponding to the pitch of the chain 25.

  Here, in the continuous unloader 1, the rollers 55 of the first chain 25a and the second chain 25b collide with the turning rollers 33a and 33b alternately at a timing shifted by a half pitch. Therefore, as shown in FIG. 6, the peak of the acceleration response generated by the first turning roller 33a and the second turning roller 33b does not overlap at the same time, and as a result, the vibration and noise of the bucket elevator 9 can be reduced. it can. That is, in the bucket elevator 9 as a whole, the acceleration peak of the diverting roller 33a and the acceleration peak of the diverting roller 33b appear alternately, but it is possible to avoid the large vibration and noise that are caused by the overlap of the two peaks.

  Further, as a configuration that exhibits the same operational effects, as shown in FIG. 7, the chain pitch of the first chain 25a and the chain pitch of the second chain 25b may be different from each other. In the example of FIG. 7, the chain pitch of the second chain 25b is 1.5 times the chain pitch of the first chain 25a. FIG. 7A is a front view of the state in which the bucket 27 is attached to the first chain 25a as viewed from the direction in which the two chains 25 are arranged. FIG. 7B is a front view of the state in which the bucket 27 is attached to the second chain 25b as viewed from the direction in which the two chains 25 are arranged.

  In the configuration of FIG. 7 as well, the distance L1 from the pin (reference numeral 53a) of the first chain 25a, which is located in front of the reference plane S1 in the traveling direction W and closest to the reference plane S1, to the reference plane S1. The distance L2 from the pin (labeled “53b”) of the second chain 25b that is located in front of the reference plane S1 in the traveling direction W and closest to the reference plane S1 to the reference plane S1 is different.

  As described above, according to the configuration in which the chain pitch of the first chain 25a is different from the chain pitch of the second chain 25b, as shown in FIG. 8, the acceleration of the turning roller 33a caused by the first chain 25a. The frequency with which the peak and the acceleration peak of the turning roller 33b due to the second chain 25b overlap can be reduced, and the large vibration and noise of the bucket elevator 9 can be suppressed. Also in this case, the connection mechanism 61 and the connection mechanism 62 are asymmetric, so that the buckets 27 having a plane symmetry are both supported by the first chain 25a and the second chain 25b at plane symmetry positions. Therefore, the bucket 27 is stably supported. In FIG. 7, the same or equivalent components as those in FIG.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and may be modified without changing the gist described in each claim. For example, in the embodiment shown in FIG. 4 and FIG. 5, the first chain 25a and the second chain 25b are displaced by 1/2 pitch in the traveling direction W. The pitch is not limited, and may be appropriately changed to, for example, 1/3 pitch or 1/5 pitch. In the embodiment shown in FIG. 7, the ratio of the chain pitch between the first chain 25a and the second chain 25b is 1.5, but the ratio of the two chain pitches is not limited to 1.5. .7 or 3 etc. may be appropriately changed. Further, for example, the interval between the pins 53 may vary irregularly at least one of the first chain 25a and the second chain 25b, and the chain pitch ratio may vary irregularly.

  In the example of FIG. 7, the chain pitch of the second chain 25b is longer than the chain pitch of the first chain 25a, but the chain pitch of the first chain 25a may be longer than the chain pitch of the second chain 25b. In the embodiment shown in FIGS. 4, 5, and 7, the link arms 61 a and 62 a on the front side in the traveling direction W among the link arms of the connection mechanisms 61 and 62 are bent and fixed to the bucket 27. The link arms 61b and 62b on the rear side in the traveling direction W may be bent and fixed to the bucket 27.

  DESCRIPTION OF SYMBOLS 1 ... Continuous unloader, 9 ... Bucket elevator, 25 ... Chain, 25a ... 1st chain, 25b ... 2nd chain, 27 ... Bucket, 33, 33a, 33b ... Turning roller, 53 ... Pin, 61 ... Connection mechanism (1st ), 61a ... link arm (first link), 61b ... link arm (second link), 62 ... connection mechanism (second connection portion), 62a ... link arm (first link), 62b ... link. Arm (second link), M ... bulk load (object). S1 ... reference plane, S2 ... virtual plane.

Claims (6)

A bucket elevator type continuous unloader comprising a bucket elevator for continuously conveying an object,
The bucket elevator is
A plurality of buckets for scraping and loading the object;
A pair of first and second endless chains holding the plurality of buckets in both ends;
A drive roller for driving and rotating the first and second endless chains;
A pair of turning rollers that respectively guide the first and second endless chains and change the traveling directions of the first and second endless chains, respectively.
The first and second endless chains are a roller chain type having a plurality of pins arranged in a longitudinal direction,
When an arbitrary virtual plane orthogonal to the traveling direction of the first and second endless chains is used as a reference plane, the first position closest to the reference plane is located in front of the reference plane and closer to the reference plane. The distance from the pin of the endless chain to the reference surface is different from the distance from the pin of the second endless chain located in front of the reference surface and closest to the reference surface to the reference surface. The continuous unloader is characterized in that the pins of the first and second endless chains are arranged as described above. The first and second endless chains have equal chain pitch to each other;
2. The continuous unloader according to claim 1, wherein phases at positions in contact with the turning rollers are different from each other.   3. The continuous unloader according to claim 2, wherein phases of the first and second endless chains that are in contact with the turning roller are shifted from each other by a half pitch.   The continuous unloader according to claim 1, wherein the first and second endless chains have different chain pitches. A connection mechanism for connecting the endless chain and the bucket;
The connection mechanism is
A first link connected to one pin of the endless chain and fixed to the bucket;
The continuous unloader according to claim 1, further comprising: a second link connected to another pin of the endless chain and connected to the first link. A first connection part that connects the first endless chain and one end side of the bucket; and a second connection part that connects the second endless chain and the other end side of the bucket;
The bucket has a plane-symmetric shape with respect to a virtual plane located in the middle between the first endless chain and the second endless chain,
The connection position between the first connection part and the bucket and the connection position between the second connection part and the bucket are plane-symmetric positions with respect to the virtual plane. The continuous unloader according to claim 1.

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