JP5171341B2 - Conveyor - Google Patents

Description

  The present invention relates to a scraper-type conveyor for conveying powder particles and the like.

  In a mill or a feed storage silo, a conveyor suitable for conveying powder particles is generally provided. One such conveyor is a scraper conveyor. In this scraper conveyor, a scraper (conveying plate) for transportation is attached to an endless chain that is wound around a pair of sprockets and turns at a predetermined interval. As an example of this scraper conveyor, as disclosed in Patent Document 1, the lower side of the rotating endless chain is the conveying side, and the upper side is the return side. A flat slide bed is formed at the bottom of the transport side, and side plates are erected on both side ends. As described above, the pair of sprockets and the endless chain are accommodated in a box-shaped transfer casing formed by the slide bed and both side plates. The granular material to be transported is dropped on the slide bed. As the chain turns, the scraper moves while scratching on the slide bed surface, and conveys the granular material on the slide bed surface.

  In the scraper conveyor (hereinafter also simply referred to as a conveyor), a slide bed portion corresponding to a target position for conveying the granular material is formed with a drop opening (notch opening) for dropping the granular material downward. . The granular material that has been transported on the slide bed is dropped from this drop opening. When there are a plurality of transfer target positions on one conveyor, a plurality of drop holes are formed. In this case, a gate plate (door) is provided at each drop opening to open and close it. When the gate is not used, the gate plate is closed so that the upper surface of the gate plate functions as a slide bed surface.

  Recently, many gate plates are configured such that the top surface of the gate plate is flush with the top surface of the slide bed when the drop port is closed (see Patent Document 1). This is a device for solving the following problems. That is, if there is no such contrivance, there will be a level difference of at least the plate thickness of the slide bed between the upper surface of the gate plate at the closed position and the upper surface of the slide bed. When this happens, powder particles accumulate on the top surface of the gate plate that has fallen by this level difference at the drop mouth, and when the gate plate is retracted and the drop opening is opened, the accumulated powder particles fall downward from the drop mouth. End up. If it does so, when the granular material conveyed by a conveyor is changed, the granular material before a change which remained on the gate board will mix in the granular material after a change. In order to avoid this, the upper surface of the gate plate is flush with the upper surface of the slide bed when the gate plate is closed to prevent the powder particles from remaining on the gate plate.

  However, when the upper surface of the gate plate and the upper surface of the slide bed are flush with each other, another problem may occur. That is, when the endless chain stops turning, a part of the endless chain that has slackened due to use sags slightly at the outlet, and is caught by the gate plate that performs the closing operation. In a conveyor having a plurality of drop openings, when the type of the granular material to be transferred is changed, the drop opening that is the transfer destination position is switched accordingly. In this case, the turning of the chain is stopped, the drop opening that has been opened so far is closed, and the other drop openings are opened. After this work, the chain starts to turn again. The chain is not drooped because a large tension is applied to the chain at the time of turning, but when the turning is stopped, the tension due to the turning drive is eliminated, and the chain slightly drops. This sagging portion enters the opening of the opening and gets caught by the gate plate to be closed.

The method of pressing the tension pulley against the chain to eliminate the slack of the swiveling endless chain is widely used in other technical fields, but is not suitable for this scraper conveyor. Another possible method is to move the sprocket position in a timely manner and apply tension to the endless chain. In this case, it is necessary to frequently stop the conveyor to adjust the position, which greatly increases the operating efficiency. Cause a serious decline.
Registered Utility Model No. 2059244

  The present invention has been made in view of such circumstances, and provides a conveyor that prevents the endless chain from sagging when the endless chain stops turning without the need to adjust the distance between the pair of sprockets over a long period of time. The purpose is that.

The conveyor of the present invention is
A pair of sprockets;
An endless chain that is wound around the pair of sprockets and attached with a scraper that conveys the conveyed object at predetermined intervals;
A chain tensioning device that increases the tension of this endless chain;
A plurality of lower portions of the endless chain, and a spout from which a transported object transported by a scraper falls,
A gate plate that opens and closes each outlet,
The upper surface of the gate plate is formed flush with the upper surface of the slide bed provided with the drop port,
The chain tensioning device elastically urges at least one of the sprockets in a direction to increase the distance between the two sprockets, and the distance between the two sprockets is increased to prevent the endless chain from being caught on the gate plate. And a distance enlarging mechanism.

  According to the conveyor having such a configuration, the elastic mechanism elastically applies tension to the endless chain wound around the pair of sprockets. Therefore, even if the chain stops turning and the tension due to the turning drive disappears, the tension by the elastic mechanism remains, so that the chain is prevented from slackening.

  A machine frame to which the pair of sprockets is attached is provided, and a screw rod extending in the longitudinal direction of the chain on one of the sprocket and the machine frame and a screw rod provided on the other side are provided in the distance increasing mechanism. A nut member that is screwed together, and one of the screw rod and the nut member is fixed, and the other is rotated to move the sprocket in a direction in which the arrangement interval is increased. As a result, the configuration of the distance enlarging mechanism becomes simple, and the operation thereof becomes easy. The machine frame mentioned here is not limited to a casing that completely accommodates the sprocket and the chain, but has a broad meaning including members such as a frame that supports them.

  An elastic member may be attached between the screw rod and the machine frame in the elastic mechanism, and the elastic member may be configured to urge the sprocket in a direction of widening the arrangement interval between the two sprockets by its restoring force. For example, a coil spring can be adopted as the elastic member.

  A bearing member for supporting a shaft passing through the center of the sprocket is provided, the nut member is fixed to the bearing member, the screw rod is screwed to the nut member, and the elastic member is moved from a spring provided with pre-deflection. The sprocket is configured to be biased via the screw rod and the nut member by the restoring force of the spring, and further provided with a stopper for limiting the deflection of the spring to a predetermined value. Can do.

  In addition, a machine frame to which the pair of sprockets are attached is provided, and the elastic mechanism includes an elastic member and an elastic member attaching part attached to the sprocket, and the elastic member is connected to the elastic member attaching part and the machine frame. The sprocket can be urged in the direction of widening the arrangement interval between the two sprockets.

The conveyor of the present invention is
A pair of sprockets;
A machine frame to which the pair of sprockets can be attached;
A bearing member that supports the central axis of each sprocket;
An endless chain wound around the pair of sprockets and having a scraper attached at predetermined intervals;
A plurality of lower portions of the endless chain, and a spout from which a transported object transported by a scraper falls,
A gate plate that opens and closes each dropper;
A nut member fixed to the bearing member;
A screw rod screwed to the nut member and provided with a spring seat;
A coil spring mounted in a pre-compressed state between the spring seat and the machine frame, the restoring force of which acts on the bearing member in the direction in which the spacing between the pair of sprockets increases. When,
A stopper attached to the screw rod for limiting the compression deflection of the coil spring to a predetermined value;
The upper surface of the gate plate is formed flush with the upper surface of the slide bed provided with the drop port,
The spacing between the pair of sprockets is increased to prevent the loose endless chain from being caught on the gate plate.

  Also with this configuration, the coil spring elastically applies tension to the endless chain wound around the pair of sprockets. Therefore, similar to the above-described conveyor, the tension remains even when the chain stops turning, so that the chain is prevented from slackening.

The conveyor of the present invention is
A pair of sprockets;
A machine frame to which the pair of sprockets can be attached;
A bearing member that supports the central axis of each sprocket;
An endless chain wound around the pair of sprockets and having a scraper attached at predetermined intervals;
A plurality of lower portions of the endless chain, and a spout from which a transported object transported by a scraper falls,
A gate plate that opens and closes each dropper;
A screw rod fixed to the bearing member and provided with a spring seat;
A coil spring mounted in a pre-compressed state between the spring seat and the machine frame, the restoring force of which acts on the bearing member in the direction in which the spacing between the pair of sprockets increases. When,
A nut member screwed onto the screw rod;
A stopper attached to the screw rod for limiting the compression deflection of the coil spring to a predetermined value;
The upper surface of the gate plate is formed flush with the upper surface of the slide bed provided with the drop port,
The spacing between the pair of sprockets is increased to prevent the loose endless chain from being caught on the gate plate.

  Also in the conveyor of this configuration, since the coil spring applies tension to the endless chain, slack of the chain is prevented. In the present invention, the object to which the screw rod is attached and the object to which the nut member is attached are reversed from the above-described invention, and the special technical features correspond to the above-described invention.

  According to the present invention, since at least one of the sprockets is elastically biased in the direction of widening the arrangement interval between both sprockets, even if the endless chain turning stops and the chain tension due to the turning drive disappears, The tension applied elastically remains. Therefore, even when the endless chain is stopped from turning without adjusting the distance between the pair of sprockets over a long period of time, the chain is prevented from sagging at the throat.

  Hereinafter, a scraper conveyor (hereinafter simply referred to as a conveyor) which is an embodiment of the conveyor of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing an intermediate portion of a scraper conveyor according to an embodiment of the present invention before assembly. FIG. 2 is a perspective view of the driven sprocket portion of the conveyor of FIG. 1 before assembly. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a view taken along the line IV-IV showing the front of the sprocket portion of FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a partial cross-sectional view showing the chain tensioning device in the sprocket portion of FIG.

  As shown in FIG. 1, the conveyor 1 is connected to a pair of sprockets (only one sprocket 2 is shown in FIG. 2) and swung around an endless chain (hereinafter also simply referred to as a chain) 3. A large number of scrapers 4 are attached at predetermined intervals. The chain 3 has a large number of links 3a connected in a loop by pins 3b. Of course, the configuration of the chain 3 is not limited. Both the sprocket 2 and the chain 3 have a box-like shape composed of a lower slide bed 5, an upper top plate 6, left and right side plates 7, and front and rear end plates (only one end plate 8 is shown in FIG. 2). It is accommodated in a casing 9 as a machine frame. The lower side of the endless chain 3 is the conveyance side C, and the upper side is the return side R. A support shelf 10 for receiving the chain on the return side R along the turning direction of the chain 3 is disposed between the return side R and the conveyance side C and in the vicinity of the chain 3 on the return side R. ing. The support shelf 10 includes a large number of bars 10a spanned between the left and right side plates 6, and support rails 10b attached to the bars 10a in the longitudinal direction of the casing 9.

  Drop openings 11 which are positions for conveying the granular material are opened at a plurality of locations on the slide bed 5. The granular material that has been conveyed on the slide bed 5 by the scraper 4 is dropped downward through the dropper 11. Each drop port 11 is provided with a gate plate 12 for opening and closing it. The gate plate 12 is opened and closed by a feed screw mechanism 13 or the like. When the gate plate 12 closes the drop port 11, the upper surface of the gate plate 12 and the upper surface of the slide bed 5 are flush with each other.

  FIG. 2A shows a portion of the conveyor 1 where the driven sprocket 2 is installed. FIG. 2B shows the chain tensioning device (described later) 21 in FIG. In FIG. 2A, the chain 3 is not shown. Prevention for preventing the remaining of the transport object such as powder on the rear side of the sprocket 2 (right side in the figure), that is, on the side opposite to the driving side sprocket (not shown) across the driven side sprocket 2 A plate 14 is disposed. A work opening 6a is formed in the top plate 6, and a lid 6b is detachably attached to the opening 6a. As is apparent from FIGS. 3 to 5 together with FIG. 2, a support shaft 2 a passing through the center of the sprocket 2 is fixed to the sprocket 2. The left and right side plates 7 are formed with long holes 7a (FIGS. 3 to 5) that can penetrate the support shaft 2a and extend in the extending direction of the chain 3. Both left and right end portions of the support shaft 2a penetrating the long hole 7a are rotatably supported by bearing members 15 disposed on the outer surfaces of the side plates 7. On the outer surface of the side plate 7, two parallel rails 16 are attached along the extending direction of the chain 3 (longitudinal direction of the casing 9) with a space in the vertical direction. The bearing member 15 is sandwiched between the upper and lower rails 16 and is attached so as to be movable along the rails 16.

  The bearing member 15 is sandwiched between the upper and lower rails 16 and slides on the outer surface of the side plate 7, the bearing 18 fixed to the slide plate 17, and the surface of the slide plate 17 on the side plate 7 side. There are affixed rubber plate 19 for sealing and a leaf spring 20 that is mounted between the upper and lower rails 16 and biases the surface of the rubber plate 19 of the slide plate 17 against the outer surface of the side plate 7. doing. The leaf springs 20 are disposed before and after the bearing 18, respectively. By carrying out like this, the sealing function of the rubber plate 19 is exhibited and it can suppress that the granular material in the casing 8 escapes outside through the said long hole. The bearing 18 is composed of a ball bearing that rotatably supports the support shaft 2a of the sprocket 2. With this configuration, when the bearing member 15 moves along the rail 16, the driven sprocket 2 supported by the bearing member 15 also moves together. The type of the bearing 18 is not particularly limited to the ball bearing.

  As shown in FIGS. 2 and 4 to 6, a chain tensioning device 21 is disposed so as to connect each of the left and right bearing members 15 and the end plate 8 which is a part of the casing 9. This chain tensioning device 21 increases the tension of the chain 3 by moving the driven sprocket 2 away from the drive sprocket (not shown), that is, in a direction that increases the distance between the drive and driven sprockets. It is. This chain tensioning device 21 is driven by a mechanism (manual tensioning mechanism) that exhibits a function (manual tensioning function) for moving the driven sprocket 2 to a desired dimension toward the end plate 8 by a feed screw method and a coil spring 26. And a mechanism (automatic tension mechanism) that exerts a function (automatic tension function) that always pulls the sprocket 2 elastically toward the end plate 8. In addition, it is not limited to adoption of the coil spring 26, You may use another elastic member. Thus, since the automatic tension mechanism uses an elastic member such as a coil spring, it is also called an elastic mechanism. Resilient means that the pulling force decreases as the pulled distance increases. The “manual tension” is a tentative name used for comparison with the “automatic tension”. This is not manual, and the chain is not manually used by cooperation of a tension detection sensor, an electric motor, and the like. Including those that tension 3. Since the manual tensioning mechanism is a mechanism that increases the separation distance between the pair of sprockets, it is also referred to as a distance expansion mechanism.

  A mounting bracket 22 protrudes from the slide plate 17 of the bearing member 15, and a nut 23 is fixed to the mounting bracket 22. A locking plate 24 is disposed on the end plate 8. The threaded rod 25 extends in the extending direction of the chain 3, and its distal end is screwed into the nut 23, and its proximal end is inserted into a through hole 24 a formed in the locking plate 24. Yes. As shown, the locking plate 24 is located on the opposite side of the drive sprocket (not shown) with the driven sprocket 2 in between. Next, the automatic tension mechanism described above will be described below.

  As shown in FIG. 6, a coil spring 26 is fitted on the outer side of the locking plate 24 of the screw rod 25 (the base end side of the screw rod 25), and further, a bottomed cylindrical spring housing 27 is provided. The coil spring 26 is mounted so as to be accommodated. The bottom 27a of the spring housing 27 and the outer surface 24b of the locking plate 24 constitute a spring seat. As will be described later, the distal end 27b of the cylindrical portion of the spring housing 27 exerts a stopper function by contacting the locking plate 24 (see FIG. 6B). That is, while the conveyor 1 is in operation, the chain 3 (as a result, the driven sprocket 2) is pulled toward the driving sprocket by driving the driving sprocket, but the stopper 27b of the spring housing 27 is the locking plate 24 of the end plate 8. Therefore, the driven sprocket 2 does not move further toward the drive sprocket.

  In this embodiment, a spring washer 28 is attached to the outer surface 24b of the locking plate 24. As the spring seat member, a thrust bearing may be employed instead of the washer 28. This is because when the screw rod 25 is rotated as will be described later, the coil spring 26 is also rotated. A collar 29 is fixed to the outer side (base end side) of the screw rod 25 from the spring housing 27 by a fixing pin 29a, and a synchronizing sprocket 30 is fixed to the outer side by a fixing pin 30a. A synchronization chain 31 is wound around the sprocket 30 of the left and right chain tensioning devices 21.

  Further, a nut 32a and a lock nut 32b for setting the initial deflection of the coil spring 26 are screwed onto the opposite side of the screw rod 25 to the coil spring 26 sandwiching the locking plate 24 (the tip end side of the screw rod 25). Has been. The nut 32a and the lock nut 32b adjust the gap D between the distal end 27b of the cylindrical portion of the spring housing 27 serving as the stopper and the locking plate 24, together with the initial deflection of the coil spring 26. The coil spring 26 is set in a state where an initial compression deflection is given. Therefore, as described above, the driven sprocket 2 is elastically pulled by the restoring force so as to widen the distance between the pair of sprockets (FIG. 6A). As a result, tension is applied to the chain 3 to prevent the slack.

  However, the tension generated in the chain 3 by the driving force of the driving sprocket (not shown) during the operation of the conveyor B is large. The force that causes the driven sprocket 2 caused by this tension to approach the drive sprocket overcomes the restoring force of the coil spring 26. That is, the coil spring 26 having such strength is employed. In other words, the spring constant and the initial deflection that can exhibit such an action are selected. As a result, the screw rod 25 is pulled to the drive sprocket side until the stopper 27b of the spring housing 27 contacts the outer surface 24b of the locking plate 24 (FIG. 6B). When the driving force of the driving sprocket is eliminated from the chain 3 by stopping the operation of the conveyor B, the driven sprocket 2 is moved in a direction to elastically increase the sprocket arrangement interval by the restoring force of the coil spring 26 as described above. It is done. Then, the nut 32a is pulled until it abuts against the inner surface 24c of the locking plate 24 (FIG. 6 (a)), and the chain 3 is prevented from loosening. Of course, the specifications and initial deflection of the coil spring 26 and the dimensions of the spring housing 27 are the same for the left and right chain tensioning devices 21.

  As described above, when changing the opening to be opened among the plurality of dropping openings 11, the turning drive of the chain is stopped. Then, when the drop port 11 is closed by the gate plate 12, it has been a problem that it is caught by the slack chain 3. However, according to the conveyor 1 having the above-described configuration, the coil spring 26 suppresses the slackness of the chain 3 when the chain 3 is stopped from turning, so that it is prevented from being caught by the gate plate 12. Therefore, in this conveyor 1, tension is automatically applied to the chain 3 every time the chain 3 stops rotating (automatic tension function), and therefore, switching of the spout 11 is included without requiring any special work. Continuous operation is possible.

  As described above, the chain tensioning device 21 is provided with a manual tensioning mechanism for tensioning the chain by a special operation of a feed screw type as necessary, in addition to the automatic tensioning mechanism using the coil spring 26. Hereinafter, this manual tensioning mechanism will be described.

  Four chamfered portions 25a are formed at the base end portion of the screw rod 25 so that the cross section is rectangular in order to facilitate the screw rod rotation operation. As described above, the screw rod 25 is screwed into the nut 23 fixed to the bearing member 15 and is always pulled to the proximal end side by the coil spring 26. Therefore, when the screw rod 25 is rotated in the forward and reverse directions, the driven sprocket 2 moves in the front-rear direction (direction for loosening and increasing the chain tension). In order to smoothly rotate the screw rod 25 at this time, it is preferable to replace the spring washer 28 with a thrust bearing as described above. Further, when rotating the screw rod 25, the nut 32a and the lock nut 32b are once loosened. As described above, since the screw rods 25 of the left and right chain tensioning devices 21 can be rotated synchronously via the synchronizing sprocket 30 and the chain 31, the driven sprocket 2 can be moved easily and smoothly. .

  According to the chain tension device 21 having such a configuration, when the slack of the chain 3 due to the long-term use of the conveyor 1 cannot be eliminated even by the automatic tension function by the coil spring 26, the tension of the chain 3 is reduced by the manual tension function. Can be played. That is, when the chain 3 stops turning, even if the chain 3 hangs down into the opening 11 that has been opened, this loosening is eliminated by rotating the screw rod 25 while the coil spring 26 is acting. can do. And this conveyor 1 can be continuously operated, utilizing an automatic tension function for a long period of time.

  In the manual tensioning mechanism in this embodiment, the nut 23 is fixed to the bearing member 15 and the chain 3 is tensioned by rotating the screw rod 25. However, it is not limited to such a configuration.

  For example, like the chain tensioning device 33 shown in FIG. 7, the screw rod 34 is fixed to the mounting bracket 37 of the bearing member 15, and the collar 29 in the chain tensioning device 21 in FIG. Instead, the adjustment nut 35 may be screwed together. The synchronizing sprocket 30 is integrated with the adjusting nut 35 without being pinned to the screw rod 34. Reference numeral 36 denotes a lock nut. As described above, the mounting target of the screw rod 34 and the nut 35 may be reversed from that of the above-described embodiment, and the fixing and the moving may be reversed. The automatic tensioning mechanism of the chain tensioning device 33 has the same configuration as the automatic tensioning mechanism of the chain tensioning device 21 of FIG. The same members as those in the chain tensioning device 21 in FIG. 6 are denoted by the same reference numerals, and the description thereof is omitted.

  In order to execute the manual tensioning function by the chain tensioning device 33, first, the nut 32a and the locknut 32b are loosened (moved to the left in the figure) to provide a gap between the locking plate 24 and the locking plate 24. Next, the adjustment nut 35 is tightened, and the stopper 27 b of the spring housing 27 is brought into contact with the locking plate 24. That is, it is tightened by the gap D1 between the original locking plate 24 and the stopper 27b. By further tightening by a predetermined dimension D2 (not shown) after the contact, the driven sprocket 2 approaches the locking plate 24 by the corresponding amount D2. The nut 35 for adjustment is tightened by a predetermined dimension D1 + D2 as a whole. Then, the nut 32 a and the lock nut 32 b are tightened and brought into contact with the locking plate 24. Next, the adjusting nut 35 is loosened by a predetermined dimension D1 (the original gap D1). By doing so, the driven sprocket 2 moves in the direction of widening the sprocket interval by the dimension D2. Further, a gap D1 between the stopper 27b and the locking plate 24 is generated. This means that the expansion / contraction allowance of the coil spring 26 remains by D1. The expansion / contraction allowance D1 need not be changed before and after adjustment.

  The present embodiment is a scraper conveyor 1 having a pair of sprockets, and the chain tensioning devices 21 and 33 are disposed only on the driven sprocket 2. However, it is not limited to such a configuration. For example, the chain tensioning devices 21 and 33 may be disposed on the drive sprocket. However, since the drive device is connected to the drive sprocket, it is not so easy to exhibit the automatic tension function smoothly when the chain tension device is attached. Therefore, it is preferable to attach to the driven sprocket.

  Further, the automatic tensioning mechanism and the manual tensioning mechanism can be separated, the automatic tensioning mechanism can be disposed on the driven sprocket 2, and the manual tensioning mechanism can be disposed on the drive sprocket.

  According to the present invention, even when the turning of the chain stops and the tension of the endless chain due to the turning drive disappears, the tension applied elastically remains. Therefore, without adjusting the distance between the pair of sprockets over a long period of time, the chain can be prevented from sagging at the outlet when the endless chain stops turning. Therefore, it is useful for a scraper conveyor that opens and closes the outlet during operation, and a conveyor whose upper surface is flush with the upper surface of the slide bed of the conveyor when the gate plate of the outlet is closed.

It is a perspective view which shows the state before the assembly of the intermediate part of the scraper conveyor which is one Embodiment of this invention. FIG. 2A is a perspective view before assembly showing a driven sprocket portion of the conveyor of FIG. 1, and FIG. 2B is a perspective view showing the chain tensioning device extracted from FIG. 2A. It is the III-III sectional view taken on the line of FIG. It is an IV-IV line arrow directional view which shows the front of the sprocket part of FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4 and shows a plan view of the sprocket portion in FIG. 2. FIG. 6A is a partial cross-sectional view showing a chain tensioning device in the sprocket portion of FIG. 2, FIG. 6A shows a state when the turning of the chain is stopped, and FIG. 6B is a turning of the chain. Shows the state. It is a partial cross section figure which shows the chain tension apparatus in other embodiment of the conveyor of this invention, and has shown the state when rotation of a chain has stopped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Conveyor 2 ... Driven sprocket 3 ... (Endless) chain 4 ... Scraper 5 ... Slide bed 6 ... Top plate 7 ... Side plate 8 ... End plate 9 ... Casing 10 ... Support shelf 11 ... Drop port 12 ... Gate plate 13 ... Feed screw Mechanism 14 ... Prevention plate 15 ... Bearing member 16 ... Rail 17 ... Slide plate 18 ... Bearing 19 ... Rubber plate 20 ... Leaf spring 21 ... Chain tensioning device 22 ... Mounting bracket 23 ... Nut 24 ... Locking plate 25 ... Screw rod 26 ... Coil spring 27 ... Spring housing 28 ... (For spring seat) Washer 29 ... Collar 30 ... (For synchronous rotation) Sprocket 31 ... (For synchronization) Chain 32a ... Nut 32b ... Lock nut 33 ... Chain tensioning device 34 ... Screw rod 35 ... ( For adjustment) Nut 36… Lock nut 37… With bracket C ... (chain) (chain) conveying side R ... return side

Claims (7)

A pair of sprockets;
An endless chain that is wound around the pair of sprockets and attached with a scraper that conveys the conveyed object at predetermined intervals;
A chain tensioning device that increases the tension of this endless chain;
A plurality of lower portions of the endless chain, and a spout from which a transported object transported by a scraper falls,
A gate plate that opens and closes each outlet,
The upper surface of the gate plate is formed flush with the upper surface of the slide bed provided with the outlet,
The chain tensioning device elastically urges at least one of the sprockets in a direction to increase the distance between the two sprockets, and the distance between the two sprockets is increased to prevent the endless chain from being caught on the gate plate. And a distance increasing mechanism for carrying out the conveyor. A machine frame to which the pair of sprockets are attached is disposed,
The distance enlarging mechanism includes a screw rod extending in the longitudinal direction of the chain on one of the sprocket and the machine frame, and a nut member provided on the other and screwed onto the screw rod, The conveyor according to claim 1, wherein one of the screw rod and the nut member is fixed and the other is rotated to move the sprocket in a direction in which the arrangement interval is increased. The elastic mechanism has an elastic member attached between the screw rod and the machine frame, and the elastic member urges the sprocket in a direction to widen the arrangement interval between the two sprockets by its restoring force. The conveyor according to claim 2. A bearing member for supporting a shaft passing through the center of the sprocket;
The nut member is fixed to the bearing member, the screw rod is screwed to the nut member, and the elastic member is composed of a pre-deflected spring, and the restoring force of the spring The conveyor according to claim 3, wherein the sprocket is biased via the screw rod and the nut member, and a stopper is provided for limiting the deflection of the spring to a predetermined value. A machine frame to which the pair of sprockets are attached is disposed,
The elastic mechanism has an elastic member and an elastic member attaching portion attached to the sprocket;
The conveyor according to claim 1, wherein the elastic member is attached between the elastic member attaching portion and the machine frame, and the restoring force of the elastic member urges the sprocket in a direction of widening the arrangement interval between the two sprockets. A pair of sprockets;
A machine frame to which the pair of sprockets can be attached;
A bearing member that supports the central axis of each sprocket;
An endless chain that is wound around the pair of sprockets and attached with a scraper that conveys the conveyed object at predetermined intervals;
A plurality of lower portions of the endless chain, and a spout from which a transported object transported by a scraper falls,
A gate plate that opens and closes each dropper;
A nut member fixed to the bearing member;
A screw rod screwed to the nut member and provided with a spring seat;
A coil spring mounted in a pre-compressed state between the spring seat and the machine frame, the restoring force of which acts on the bearing member in the direction in which the spacing between the pair of sprockets increases. When,
A stopper attached to the screw rod for limiting the compression deflection of the coil spring to a predetermined value;
The upper surface of the gate plate is formed flush with the upper surface of the slide bed provided with the drop port,
A conveyor that expands the spacing between a pair of sprockets to prevent the loose endless chain from getting caught on the gate plate. A pair of sprockets;
A machine frame to which the pair of sprockets can be attached;
A bearing member that supports the central axis of each sprocket;
An endless chain wound around the pair of sprockets and having a scraper attached at predetermined intervals;
A plurality of lower portions of the endless chain, and a spout from which a transported object transported by a scraper falls,
A gate plate that opens and closes each dropper;
A screw rod fixed to the bearing member and provided with a spring seat;
A coil spring mounted in a pre-compressed state between the spring seat and the machine frame, the restoring force of which acts on the bearing member in the direction in which the spacing between the pair of sprockets increases. When,
A nut member screwed onto the screw rod;
A stopper attached to the screw rod for limiting the compression deflection of the coil spring to a predetermined value;
The upper surface of the gate plate is formed flush with the upper surface of the slide bed provided with the drop port,
A conveyor that expands the spacing between a pair of sprockets to prevent the loose endless chain from getting caught on the gate plate.

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