JP2010260650A - Driven shaft rotation detector for bucket conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driven shaft rotation detector for a bucket conveyor constituted by winding a conveyor chain around a sprocket attached to a driving shaft and a driven shaft and attaching a plurality of buckets to the conveyor chain at an equal interval to detect rotating speed of the driven shaft. <P>SOLUTION: A rotation detecting body 19 is attached to the driven shaft 3, a plurality of holes 21, 21,... are formed at the fixed pitch on the same radius in the rotation detecting body 19, a proximity detector 20 is arranged by opposing to the rotation detecting body 19, and change of rotating speed of the rotation detecting body 19 is detected by the proximity detector 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a device for detecting rotational fluctuation of a driven shaft from the outside of a casing in a bucket conveyor.

  In the bucket conveyor, a conveyor chain is wound around a sprocket attached to a drive shaft and a driven shaft, and a plurality of buckets for conveying an object are attached to the conveyor chain at regular intervals. And the granular material and powdery material which are conveyed are put into this bucket from an input port, and are discharged | emitted from an output port.

  8 and 9 are schematic views showing a conventional general vertical bucket conveyor apparatus. In the figure, (a) represents a conveyor chain, (b) represents a drive shaft, (c) represents a driven shaft, (d) represents a drive sprocket, and (e) represents a driven sprocket. Both drive sprockets (d) and (d) are attached to the drive shaft (b) at a predetermined interval, and both driven sprockets (e) and (e) are attached to the driven shaft (c). .

Then, these drive sprockets (d), (d) and driven sprockets (e), (e) are respectively wound with conveyor chains (b), (b). A plurality of buckets (f), (f)... Are attached at a constant pitch. The drive shaft (b) is supported by a bearing and can be rotated by a drive device (g). If the drive shaft (b) rotates, the drive sprockets (d) and (d) rotate to bring the conveyor chain (b) ), (I) travel. At the same time, the buckets (f), (f)... Attached to the conveyor chains (b), (b) can also travel.

  The drive sprocket (d), driven sprocket (e), and conveyor chain (b), (b) are housed inside the casing (h), and a slot (re) is provided at the lower end of the casing (h). A discharge port (nu) is provided at the upper end of the casing (h). Therefore, the granular material and the powdery material charged from the charging port (re) are accommodated in buckets (f), (f)... That circulate and travel, and a part of them is collected at the lower end of the casing (h). However, the accumulated granular materials and powdery materials are scooped up by the traveling buckets (f), (f) ... and then the buckets (f), (f) ... are reversed at the upper end. It is discharged from the outlet (nu).

  By the way, the driven shaft (c) is not restrained at a predetermined position, and the bearings (le) and (le) on which the driven shaft (c) is supported are lowered along the guide rails (e) and (e). It consists of a support structure that can do. In other words, the bearings (le) and (le) of the driven shaft (c) can descend by the action of their own weight following the elongation of the conveyor chain (b) and (b). ) Is kept in tension without dubs.

  These points are explanations of a general vertical bucket conveyor, but the basic structure is common to horizontal bucket conveyors. By the way, although the conveyor chain which comprises the chain conveyor produces elongation, it copes with the driven shaft (c) moving following this elongation. However, if an abnormality occurs in the meshing between the conveyor chain (A) and the driving sprocket (D) or the driven sprocket (E), the rotation of the sprocket changes.

And if the conveyor chain (A) that has been stretched and reduced in strength becomes overloaded, there is a risk of cutting. Also, when an object is caught between the conveyor chain (b) and the drive sprocket (d) or driven sprocket (e), the sprocket rotation also changes, and further, between the inner link and the outer link of the conveyor chain (b). The sprocket rotation also changes when an object is caught between the two and it becomes difficult to bend.

  In this way, if the bucket conveyor continues to operate with a change in sprocket rotation, the conveyor chain may break and cause a major accident. The problem to be solved by the present invention is this problem, and provides a driven shaft rotation detection device that can function not only to cut the conveyor chain but also to detect the drive abnormality of the entire bucket conveyor.

  The present invention is configured to detect the rotation of the driven shaft, not the drive shaft, and to know the abnormality appearing in the rotation. Therefore, a proximity switch (proximity detector) is attached outside the casing of the bucket conveyor, and the rotation fluctuation of the rotation detector attached to the driven shaft can be detected. Here, the rotation detector has holes or spaces formed at equal intervals in the circumferential direction on a fixed radius, and the rotation detector rotates with the driven shaft to detect the time interval through which the hole or space passes. Like to do.

  The specific shape of the rotation detector is not limited, and the shape of the hole or space formed in the rotation detector is also free. And in order to detect the change of the rotation speed of a rotation detection body, a proximity detector is arrange | positioned facing, and the time which passes a hole or space is detected. If the rotation detector is mounted in the casing of the driven shaft, the proximity detector is arranged outside the casing side plate, but the opening window is passed through a hermetic lid made of a non-magnetic material such as resin. Detect rotation.

  The rotation detector of the present invention is attached to the driven shaft of the bucket conveyor, and a change in the rotation speed of the rotation detector can be detected by a proximity detector. Therefore, when the rotation speed of the driven shaft changes due to other troubles as well as when the conveyor chain is cut, the proximity detector immediately detects the change in the rotation speed and stops the operation of the bucket conveyor. I can do it. That is, it is possible to prevent the occurrence of an accident by stopping the operation before a major accident occurs.

  On the other hand, in the case of a vertical bucket conveyor, the extension of the conveyor chain can be known by setting the position of the proximity detector to the upper side or the lower side with respect to the rotation detector. That is, if the perimeter of the hole or space formed in the rotation detector is changed according to the distance from the center, the position of the rotation detector is lowered, and the time for passing through the hole differs. . Knowing this change in transit time, the conveyor chain elongation can be calculated.

The front view of the bucket conveyor provided with the driven shaft rotation detection apparatus which concerns on this invention. The side view of the bucket conveyor provided with the driven shaft rotation detection apparatus which concerns on this invention. The front view of a driven shaft rotation detection apparatus. The side view of a driven shaft rotation detection apparatus. The front view of the proximity detector which comprises a driven shaft rotation detection apparatus. The side view of the proximity detector which comprises a driven shaft rotation detection apparatus. A specific example of a rotation detector. The front view of a common bucket conveyor. A side view of a general bucket conveyor.

  1 and 2 show an embodiment of a vertical bucket conveyor provided with a driven shaft rotation detecting device according to the present invention. The basic structure is the same as that of the bucket conveyor shown in FIG. 8. Both drive sprockets 2 and 2 are attached to the drive shaft 1 at a predetermined interval, and both driven sprockets 4 and 4 are attached to the driven shaft 3. Installed.

The drive sprockets 2 and 2 and the driven sprockets 4 and 4 are respectively wound around conveyor chains 5 and 5, and a plurality of buckets 6, 6... It has been. The drive shaft 1 is supported by bearings 9 and 9 fixed to support bases 8 and 8 provided on the casing 7, and can be rotated by a drive device 10 attached to the base 11. If the drive shaft 1 is rotated by the drive device 10, the drive sprockets 2 and 2 are rotated, and the conveyor chains 5 and 5 run and circulate. At the same time, the buckets 6, 6... Attached to the conveyor chains 5, 5 can also travel.

  The drive sprockets 2, 2, driven sprockets 4, 4, and conveyor chains 5, 5 are accommodated inside the casing 7, and an inlet 12 is provided at the lower end of the casing 7. A discharge port 13 is provided. Therefore, the granular material or powdery material introduced from the inlet 12 is accommodated in the buckets 6, 6... That circulate and travel, and a part of the granular material or powdery material is collected at the lower end of the casing 7. The object is picked up by the traveling buckets 6, 6..., And is discharged from the discharge port 13 when the buckets 6, 6.

  By the way, the driven shaft 3 is not restrained to a predetermined position, and the bearings 14 and 14 on which the driven shaft 3 is supported have a support structure that can be lowered along the guide rails 15 and 15. That is, the bearings 14 and 14 of the driven shaft 3 can descend by the action of their own weight following the elongation of the conveyor chains 5 and 5, and the conveyor chains 5 and 5 are always kept in tension without being dub. . In addition, a weight may be added to the driven shaft 14 to increase its own weight as necessary.

  3 and 4 show a lower end portion of the bucket conveyor, and a driven shaft rotation detecting device according to the present invention is attached to the lower end portion. Both ends of the driven shaft 3 project through openings formed in the casing side plates 16, 16 of the casing 7, and are supported by bearings 14, 14 disposed outside the casing side plates 16, 16. Yes. The bearings 14 and 14 are guided by the guide rails 15 and 15 and can be moved up and down.

  Outer plates 17 and 17 are provided outside the casing side plates 16 and 16 and closed by upper and lower plates. The guide rails 15 and 15 are provided in the spaces 18 and 18 to guide the bearings 14 and 14. . A rotation detector 19 is attached to the driven shaft 3, and the rotation detector 19 can rotate with the driven shaft 3, and the rotation state of the rotation detector 19 can be detected by the proximity detector 20. .

  As shown in FIG. 4, the rotation detector 19 forms a disk, and holes 21, 21,... The proximity detector 20 is arranged at the position of the hole 21 so that the time interval through which the holes 21, 21,... Pass can be detected by the rotation detector 19 rotating together with the driven shaft 3. Yes.

A proximity detector (proximity switch) continuously emits an alternating magnetic field from a coil that is a part of the oscillation circuit. If the metal body approaches it, an eddy current is generated in the metal body, and oscillation is generated by that energy. descend. Therefore, it functions so that it can be determined that there is a detection object when the decrease in oscillation falls below a predetermined reference. Therefore, if the rotation detector 19 penetrating the holes 21, 21... At the outer peripheral portion rotates at a constant speed, the passage time of the holes 21, 21.

  5 and 6 show detailed views of a portion to which the proximity detector 20 is attached. The proximity detector 20 is attached to a bracket 22 screwed to the casing side plate 16 and faces the rotation detector 19 with a predetermined distance. A window is formed in the casing side plate 16, and an airtight lid 23 made of resin is attached to the window to close the window. A cover 24 is attached to the bracket 22 to cover the proximity detector 20.

  The AC magnetic field emitted from the proximity detector 20 passes through the resin hermetic lid 23 and reaches the rotation detector 19, and the time for passing through the hole 21 is detected (measured). That is, if the rotational speed of the rotation detector 19 changes for some reason, the time for passing through the holes 21, 21,... If an increase or decrease occurs in the passage time of the holes 21, 21,..., It is determined that there is a problem with the rotation of the driven shaft 3.

  FIG. 7 is a specific example showing the rotation detector 19. In the figure, (A) and (C) show a disk shape, and (B) and (D) have a substantially star shape. The disk-shaped rotation detection body 19 shown in FIG. 4A is the same as the rotation detection body 19 attached to the bucket conveyor shown in FIG. 4, and the shape of the hole 21a is substantially fan-shaped. That is, it has a fan shape that is within an angle θ with respect to the center O of the rotation detector 19, and the time for passing through the hole 21a is constant regardless of the radius of the proximity detector 20 from the center O.

  In the rotation detector 19 shown in (C), a plurality of holes 21c, 21c,... Extend radially, and the shapes of the holes 21c, 21c,. The substantially star-shaped rotation detection body 19 shown in FIG. 5B forms spaces 25b, 25b... Whose outer periphery is open, and the shape of the space 25b has a generally sector shape that is within an angle θ with respect to the center O. ing. Similarly, in the case of the rotation detector 19 shown in (D), it also has a substantially star shape, and the holes 25d, 25d,.

  By the way, when these rotation detectors 19 rotate at the same speed as the driven shaft 3, in the rotation detectors 19 shown in (A) and (B), the proximity detector 20 is positioned on the outer diameter side even if the position of the proximity detector 20 is on the inner diameter side. Even so, the time for passing through the hole 21 is the same. On the other hand, in the rotation detection body 19 shown in (C) and (D), the position of the proximity detection body 20 differs between the inner diameter side and the outer diameter side. However, if a change occurs in the rotation speed of the driven shaft 3 in any rotation detection body 19, the change in the rotation speed is detected regardless of whether the rotation detection body 19 is on the inner diameter side or the outer diameter side. Can be detected.

  The rotation detector 19 of the present invention can detect a change in the rotational speed of the driven shaft 3, but can also know the extension of the conveyor chain 5. In this case, the proximity detector 20 is arranged on the upper side or the lower side with respect to the center of the rotation detector 19 if it is a vertical bucket conveyor. Therefore, when the conveyor chain 5 extends, the driven shaft 3 and the rotation detector 19 are lowered, and the distance between the proximity detector 20 and the rotation center O changes.

  As the position of the rotation detector 19 changes in this way, a change appears in the time for passing through the hole 21. However, in FIG. 7, the rotation detecting body 19 in (A) in which the shape of the hole 21 forms fan-shaped holes 21a, 21a... With the center O as a base point, and the space 25b having an outer periphery with the center O as a base point, In the case of (B) rotation detection body 19 having 25b..., There is no change in the time for passing through holes 21a, 21a.

  Therefore, in order to detect the extension of the conveyor chain 5 at the same time, the rotation detector 19 shown in FIGS. 7C and 7D must be used. In other words, the holes 21c, 21c,..., And the spaces 25d, 25d,... Formed in the rotation detection body 19 in (C) and (D) are not fan-shaped with the center O as a base point. The time for passing through the holes 21c, 21c..., The spaces 25d, 25d.

  For example, if the proximity detector 20 is disposed below the center O of the rotation detector 19, if the conveyor chain 5 extends and the rotation detector 19 descends, the holes 21c, 21c,. , The time for passing through the spaces 25d, 25d,..., And conversely, the time for passing through the holes 21c, 21c,. Therefore, it is possible to calculate the elongation of the conveyor chain 5 by the length of this passing time.

  By the way, although the bucket conveyor shown in FIG. 1 is a vertical type, it can also be a horizontal type bucket conveyor extending horizontally. In this case, since the driven shaft 3 cannot be lowered by its own weight with respect to the elongation of the conveyor chain, a chain tensioner device is attached.

DESCRIPTION OF SYMBOLS 1 Drive shaft 2 Drive sprocket 3 Drive shaft 4 Drive sprocket 5 Conveyor chain 6 Bucket 7 Casing 8 Support stand 9 Bearing
10 Drive unit
11 units
12 slot
13 Discharge port
14 Bearing
15 Guide rail
16 Casing side plate
17 Outer plate
18 space
19 Rotation detector
20 Proximity detector
21 holes
22 Bracket
23 Airtight lid
24 Cover
25 space

Claims (4)

A bucket conveyor in which a conveyor chain is wound around a sprocket attached to a drive shaft and a driven shaft, and a plurality of buckets are attached to the conveyor chain at equal intervals, and the driven shaft is used to detect the rotational speed of the driven shaft. In the shaft rotation detecting device, a rotation detector having a substantially disk shape or a substantially star shape is attached to the driven shaft, and a plurality of holes or spaces are formed on the same radius at a constant pitch on the rotation detector. A driven shaft rotation detection device for a bucket conveyor, wherein a proximity detector is arranged opposite to the rotation detector, and a change in the rotation speed of the rotation detector is detected by the proximity detector. 2. The bucket conveyor according to claim 1, wherein the rotation detector is attached to a driven shaft in the casing side plate, and the proximity detector is disposed with an airtight lid made of a non-magnetic material attached to a window provided on the casing side plate. Drive shaft rotation detection device. The driven shaft rotation detection device for a bucket conveyor according to claim 1 or 2, wherein the proximity detector is disposed on the drive shaft side with respect to the center of the rotation detector. The driven shaft rotation detection device for a bucket conveyor according to claim 1 or 2, wherein the proximity detector is disposed on the opposite side of the drive shaft with respect to the center of the rotation detector.

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