JP2015040097A - Deposit removable device for belt conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deposit removable device for a belt conveyor, which has a simple structure allowing easy maintenance and does not cause a breakage or a crack in a conveyor belt.SOLUTION: A deposit removable device for a belt conveyer blows air to a conveyance surface of an endless belt 3 traveling on a path where the conveyance surface faces downward so as to remove deposit on the belt conveyor, and comprises at least one air blowing pipe 10 disposed across the path, facing the conveyance surface of the endless belt 3 traveling on the path. Each air blowing pipe 10 includes two rows 11, 12 of through-hole groups bored at substantially equal intervals along the central axis O direction of the pipe. In the circumferential direction of the air blowing pipe 10, one row 11 is arranged at an angular position closest to the conveyance surface of the endless belt 3, and the other row 12 is arranged apart from the angular position of the row 11 by 30 to 60° of central angle(θ) in the upstream direction of the endless belt 3.

Description

  The present invention relates to an apparatus for removing deposits on a conveyor surface of a belt conveyor.

  One of various transport facilities for transporting raw materials handled in a factory is a belt conveyor. In the belt conveyor, the conveyed object placed on the conveying surface is dropped to a predetermined position by reversing the belt, but depending on the conveyed object handled, even if gravity is applied in the direction that the belt is reversed and pulled away from the belt, it does not leave immediately, After a while, it sometimes dropped.

  As a result, the transported objects are scattered under and around the belt conveyor, so that regular cleaning is necessary. Particularly, factories such as copper smelters use a large-scale belt conveyor to transport a large amount of raw materials, so that the amount scattered around is increased, and a lot of man-hours are required for cleaning. In addition, some of the adherent transported materials described above generate dust when scattered, which is not preferable in the work environment. Furthermore, if the operation is continued with the transported material remaining on the transport surface of the belt, the transported material that has adhered to the transport surface will eventually adhere to the pulley, causing the belt to meander or cut the belt. Could cause major trouble.

  Conventionally, as a countermeasure against such adherence of conveyed objects, a rectangular plate-shaped scraper is brought into contact with the conveying surface of the belt to scrape off the conveyed object adhering to the conveying surface of the belt and drop it to a predetermined position. I was letting. In this way, when removing the adhered object using a scraper, it is necessary to press the scraper firmly against the conveyor surface of the belt so that the adhered substance can be peeled off well, but if the pressing force is too strong, While this may cause damage and cracks, if the pressing force is too weak, it is difficult to sufficiently remove the conveyed product attached to the belt, and it is difficult to adjust the pressing force.

  Further, the cross-sectional shape of the belt in a plane perpendicular to the belt traveling direction is always slightly deformed due to variations in the transport amount and transport speed of the transported object, and is not constant. As described above, it is very difficult to press the scraper with a uniform force with high precision and evenly on the conveyor belt, which is slightly deformed at all times.

  As a method for removing deposits on the belt conveyor without the above-described problems, a removal method by blowing air has been proposed. For example, Patent Document 1 discloses a conveyor cleaner that removes deposits on a conveyor belt conveyance surface by using an air blowing device and a hammering device. However, since this apparatus has a structure in which a hammering apparatus is installed inside the belt conveyor, the mechanism becomes complicated and man-hours are required for maintenance. In addition, when the hammering falls off, it is wound on the belt conveyor, which may cause a big trouble.

JP 2002-356221 A

  The present invention has been made in view of the above-described problems, and can remove deposits on the conveyor surface of the belt conveyor without causing damage or cracking of the conveyor belt, and has a simple structure and easy maintenance. It is an object of the present invention to provide a deposit removing device for a belt conveyor.

  In order to solve the above-described problems, the deposit removal device for a belt conveyor according to the present invention removes deposits on the transport surface by blowing air onto the transport surface of an endless belt running on a path whose transport surface faces downward. A belt conveyor deposit removing device comprising: at least one air blowing pipe provided across the path and facing the conveying surface of an endless belt traveling along the path, The pipe has two rows of through-hole groups drilled at substantially equal intervals along the central axis direction, and one of these two rows is transported by the endless belt in the circumferential direction of the air blowing pipe. It is characterized in that it is at an angular position closest to the surface, and the other is spaced from the angular position upstream of the endless belt by a central angle of 30 to 60 °.

  ADVANTAGE OF THE INVENTION According to this invention, although the structure is simple and maintenance is easy, the deposit | attachment of the conveyance surface of a belt conveyor can be removed, without generating the damage and crack of a belt of a belt conveyor.

It is a schematic side view of the belt conveyor provided with the deposit | attachment removal apparatus of one specific example of this invention. It is typical sectional drawing which shows a mode that the deposit | attachment adhering to the conveyance surface of a belt conveyor is removed by the deposit | attachment removal apparatus of this invention. It is a general | schematic perspective view of the deposit | attachment removal apparatus of one specific example of this invention.

  Hereinafter, a specific example of the deposit removal device for the belt conveyor of the present invention will be described by taking as an example the case where the conveyed product of the belt conveyor is a raw material of a copper smelting factory. As shown in FIG. 1, a belt conveyor is generally composed of a pair of a head pulley 1 and a tail pulley 2 and an endless belt 3 bridged between them. A carrier roller 4 and a return roller 5 that are supported from below, and a hopper 6 that receives the raw material falling from the head pulley 1 portion are provided.

  In the conveyance of the conveyed product by the belt conveyor having such a configuration, the endless belt 3 on which the conveyed product is placed is reversed at the head pulley 1 and the loaded conveyed product is dropped on a hopper 6 provided below the head pulley 1. Let However, a part of the conveyed product is directed to the tail pulley 2 while adhering without leaving the conveying surface of the endless belt 3 facing downward. In this way, it is considered that the reason why some of the transported objects remain attached without falling from the transport surface facing downwards despite the fact that gravity is acting is due to the following reasons. It is done.

  That is, the endless belt 3 on which the conveyed product is placed is shaken up and down when passing through the carrier roller 4 that guides the endless belt 3 from below. Due to this up-and-down shaking, the bottom part of the conveyed product is consolidated in layers. As a result, the conveyed product layer formed by compaction does not fall on the hopper 6 even after the endless belt 3 is reversed by the head pulley 1 and remains attached to the conveying surface of the endless belt 3.

  Therefore, in the present invention, as shown in FIG. 2A, first, the adhering conveyed material layer L is 30 to 30 in the traveling direction of the endless belt 3 indicated by a white arrow with respect to the conveying surface of the endless belt 3. Air is blown from a direction inclined by 60 °, and then air is blown from a direction substantially perpendicular to the conveying surface of the endless belt 3 as shown in FIG. As a result, the force of air from the inclined direction is first applied to the transported material layer L adhering to the transport surface of the endless belt 3 in a compacted state, and as shown in FIG. On the other hand, a minute gap extending in a substantially vertical direction enters from the surface of the conveyed product layer L toward the inside. Next, by blowing air from the above-described substantially vertical direction into the fine gap, the fine gap is widened as shown in FIG. The endless belt 3 reaches the conveying surface. And the air which reached | attained the conveyance surface of this endless belt spreads along the said conveyance surface, and peels the conveyed product layer L adhering.

  As described above, in order to blow air continuously from the direction inclined in the traveling direction with respect to the conveying surface of the endless belt 3 and the vertical direction, in one specific example of the deposit removing device for the belt conveyor of the present invention, As shown in FIG. 1, an air blowing pipe 10 is attached so as to cross the path of the endless belt 3 with the conveyance surface facing downward and to face the conveyance surface of the endless belt 3 traveling along the path. In addition, since the adhering matter adhering to the conveying surface of the endless belt 3 by the air blowing from the air blowing pipe 10 falls almost directly below the air blowing pipe 10, the blowing pipe 10 is connected to the tail from the head pulley 1. It is desirable to provide in the upper part of the opening part of the hopper 6 among the path | routes in which the conveyance surface to the pulley 2 faces downward.

  As shown in FIG. 3, the air blowing pipe 10 has a row 11 of through-hole groups and a row 12 of through-hole groups drilled at substantially equal intervals along the central axis O direction. In the circumferential direction of the air blowing pipe 10, one row 11 of these two rows of through-hole groups is provided at an angular position closest to the conveying surface of the endless belt 3, and the other row 12 has the angle. It is spaced from the position upstream of the endless belt 3 (corresponding to the right side in FIG. 3) with a central angle (θ) of 30 to 60 °.

  The tip of the air blowing pipe 10 is sealed, and the other end is connected to an air supply device such as an air compressor (not shown). Then, by supplying air from the air supply device to the air blowing pipe 10, air is blown out vigorously from the two rows of through-hole groups 11 and 12 toward the conveying surface of the endless belt 3. Thereby, the air in the oblique direction blown from the row 12 of through-hole groups is first blown to the conveyed product layer L adhering to the conveyor belt, and then the vertical air blown from the row 11 of through-hole groups. Directional air is blown. As a result, the conveyed product layer L can be peeled off from the conveying surface of the endless belt 3 by the action described in FIGS. 2 (a) to 2 (b).

  Thus, the deposit removal device for the belt conveyor of the present invention is basically composed of an air blowing pipe, so the structure is simple and maintenance is easy, and there is a portion that contacts the endless belt. As a result, the endless belt is not damaged or cracked. Therefore, the deposits on the belt conveyor can be removed very easily, and the number of man-hours required for cleaning the conveyed objects scattered and deposited around the belt conveyor can be reduced.

  Here, among the two rows of through-hole groups of the air blowing pipe 10, the row 12 of through-hole groups responsible for blowing air in an oblique direction is the center of the blowing pipe 10 with respect to the row 11 of through-hole groups. When it exists in the angle position which deviated from 30-60 degrees in the angle, since the force which acts on the conveyance direction L with respect to the conveyance layer L adhering to the conveyance surface of the endless belt 3 becomes weak, the conveyance layer L The effect of generating cracks in the surface and extending substantially perpendicular to the conveying surface is reduced. For this reason, even if the air from the row | line | column 11 of a subsequent through-hole group is sprayed, it becomes difficult to peel the conveyance thing layer L adhering to the conveyor belt from a conveyance surface.

  The air blowing pipe 10 has an outer diameter of about 20 to 100 mm, for example, and the inner diameter of each air blowing hole constituting the rows 11 and 12 of the through hole group provided on the outer peripheral surface is preferably 3 to 8 mm. . When the inner diameter is less than 3 mm, the air flux is too thin to make it difficult to form a fine gap, and it is difficult to greatly widen the produced fine gap. Therefore, the effect of peeling the transported material layer L such as a concentrate layer attached to the transport surface of the endless belt 3 is reduced. On the other hand, when the diameter of the air blowing hole exceeds 8 mm, the effect of creating a fine gap and the effect of peeling the conveyed product layer L adhering to the endless belt 3 by entering the produced fine gap can be obtained. The effect does not change much even if the inner diameter of the blowout hole is increased beyond 8 mm, but the air consumption is increased and the power consumption of the air compressor supplying air is increased.

  The plurality of blowing holes constituting the rows 11 and 12 of the through-hole group are preferably provided at substantially equal intervals with an interval of 30 to 50 mm along the longitudinal direction of the air blowing pipe 10. When this distance is less than 30 mm, an effect of generating a fine gap and an effect of peeling the conveyed product layer L that enters the fine gap and adheres to the conveyance surface of the endless belt 3 are obtained, but the air consumption increases. Therefore, only the power consumption of the air compressor supplying the air is increased. On the other hand, if this distance exceeds 50 mm, the distance between the two air blowing holes adjacent in the longitudinal direction is too wide, so it becomes difficult to drop the transported material layer L layer adhering to the transport surface of the endless belt 3 over the entire surface. There is a high possibility that a part will remain attached to the endless belt 3.

  The air blowing pipe 10 may be capable of reciprocating in the longitudinal direction. In this case, it is preferable that the stroke distance to be reciprocated is substantially the same as the interval between the two air blowing holes adjacent in the longitudinal direction. In this way, by reciprocating the air blowing pipe 10 with the stroke distance being substantially the same as the distance between the two air blowing holes adjacent in the longitudinal direction, all of the transported object layer L attached to the transport surface of the endless belt 3 can be obtained. Air can be blown against the surface. Accordingly, it is possible to reduce the remaining amount of the concentrate layer still attached to the conveying surface of the endless belt 3 after the air is blown.

  When the stroke distance of this reciprocating motion is shorter than the interval between the two air blowing holes adjacent in the longitudinal direction, air is blown to all the surfaces of the conveyed product layer L adhering to the conveying surface of the endless belt 3. Becomes difficult. On the other hand, when the stroke distance of this reciprocation exceeds the above-mentioned distance, air can be blown against all the surfaces of the conveyed product layer L adhering to the conveyance surface of the endless belt 3, but as this distance becomes longer Since it is necessary to extend the length of the air blowing pipe 10 and the number of air blowing holes increases by the extended length, the amount of air consumed unnecessarily increases, which is not preferable.

  Two or three air blowing pipes 10 may be provided in parallel to each other. Thereby, air can be more reliably blown with respect to all the surfaces of the conveyed product layer L adhering to the conveyance surface of the endless belt 3. In addition, even if the number of the air blowing pipes 10 is four or more, the effect of generating a fine gap in the conveyed product layer L adhering to the conveyance surface of the endless belt 3 and the conveyance surface of the endless belt entering the generated fine gap The effect of peeling off the transported material layer L adhering to the film is not so improved, but the structure becomes complicated and the air consumption increases, which is not preferable.

  Air may be intermittently supplied to the air blowing pipe 10. Thereby, the blowing of air from the blowing hole of the air blowing pipe 10 becomes intermittent, and the concentrate layer adhering to the conveying surface of the endless belt can be peeled off very efficiently. This is because the endless belt 3 can be moved up and down in a direction substantially perpendicular to the conveying surface by blowing air on the conveying surface of the endless belt or by temporarily stopping the blowing of air. This is because, in addition to the force in the oblique direction due to the blowing of air, the force due to the vertical movement acts on the deposit on the conveying surface of the endless belt.

  For example, when air is blown again and air is blown again when the endless conveyor 3 and the deposit on the transport surface return rapidly from the top to the bottom, air is blown continuously, compared to the case of blowing air continuously. A strong force can be applied. Thereby, it becomes possible to form a big clearance gap and many clearance gaps on the surface part of a concentrate layer, and it can peel more efficiently in the case of air blowing from the perpendicular | vertical direction of a back | latter stage.

Example 1
A belt conveyor deposit removing device as shown in FIG. 3 was attached to a belt conveyor having a conveyance amount of 200 t / h. Specifically, one pipe having an inner diameter of 25 mm and a length of 3 m sealed is prepared, and a plurality of air blowing holes having an inner diameter of 3 mm along the longitudinal direction are spaced 30 mm apart from the belt conveyor. Drilled within the range corresponding to the width. Furthermore, a plurality of air blowing holes having an inner diameter of 3 mm are similarly provided along the longitudinal direction at intervals of 30 mm at positions spaced 30 ° in the central angle with respect to the circumferential direction of the pipe with respect to the group of through holes in this row. Perforated from end to end.

  Then, this pipe is installed at a position where the conveying surface crosses the downward path, and at this time, one of the two rows of through-hole groups formed in the pipe is the endless belt running on the path. It was closest to the conveying surface, and the other row was directed to the upstream side of the endless belt. At this time, the distance between the conveying surface of the endless belt and the outer opening of the air blowing hole closest to the endless belt was 50 mm. And while reciprocating the pipe provided with this air blowing hole at a stroke distance of 30 mm in the longitudinal direction, air having a pressure of 0.1 MPa was continuously supplied from an air compressor connected to one end side.

  The operation was continued for three months in this state. As a result, the cleaning frequency of the belt conveyor has greatly improved from 1 month to 2.5 months. As a result of this improvement, the number of man-hours required for cleaning the belt conveyor could be reduced by 60%.

(Example 2)
Three belt conveyor deposit removing devices as shown in FIG. 3 were attached to a belt conveyor having a conveyance amount of 200 t / h so as to be parallel to each other. Specifically, three pipes having an inner diameter of 100 mm and a length of 3 m sealed at the tip are prepared, and a plurality of air blowing holes having an inner diameter of 8 mm along the longitudinal direction thereof are spaced at intervals of 50 mm. Perforations were made within the range corresponding to the width of the conveyor. Further, a plurality of air blowing holes having an inner diameter of 8 mm are similarly provided along the longitudinal direction at intervals of 50 mm at positions spaced 60 ° in the central angle with respect to the circumferential direction of the pipe with respect to the group of through-holes in this row. Perforated from end to end.

  And these pipes are installed in the position where the conveyance surface crosses the downward path, and at that time, one of the two rows of through-hole groups formed in each pipe is an endless belt traveling along the path The other row was directed to the upstream side of the endless belt. At this time, the distance between the conveying surface of the endless belt and the outer opening of the air blowing hole closest to the endless belt was 200 mm. Then, air having a pressure of 0.6 MPa was supplied from an air compressor connected to one end via an electromagnetic valve while reciprocating the pipes provided with the air blowing holes in the longitudinal direction at a stroke distance of 50 mm.

  This solenoid valve was opened and closed repeatedly at intervals of 2 seconds, and air was blown out intermittently from the air blowing holes of the pipe. The operation was continued for three months in this state. As a result, the cleaning frequency of the belt conveyor has been greatly improved from 1.0 months to 3.0 months. As a result of this improvement, man-hours required for cleaning the belt conveyor could be reduced by 67%.

Example 3
The operation was continued for 3 months in the same manner as in Example 1 except that the pipe was fixed without reciprocating in the longitudinal direction. As a result, although the cleaning frequency of the belt conveyor was slightly inferior to that of Example 1, it greatly improved from 1 month to 2.0 months. As a result of this improvement, man-hours required for cleaning the belt conveyor could be reduced by 50%.

(Comparative example)
Prepare a pipe with an inner diameter of 20 mm and a length of 3 m sealed at the tip, and a range corresponding to the width of the belt conveyor with a plurality of air blowing holes with an inner diameter of 2 mm at 60 mm intervals along the longitudinal direction. Perforated inside. Furthermore, a plurality of air blowing holes having an inner diameter of 2 mm are similarly provided along the longitudinal direction at intervals of 60 mm at positions spaced 90 ° in the central angle with respect to the circumferential direction of the pipe with respect to the group of through holes in this row. Perforations were made within a range corresponding to the width of the belt conveyor.

  And this pipe is installed in the position where the conveyance surface crosses the downward path, and at that time, one of the two rows of through-hole groups formed in the pipe is an endless belt running on the path An angular position inclined at a central angle of 30 ° from the angular position closest to the conveying surface to the downstream side and an angular position inclined at a central angle of 90 ° upstream from the angular position of the one row. did. At this time, the distance between the conveying surface of the endless belt and the angular position of the pipe closest to the endless belt was 300 mm. The pipe provided with the air blowing holes was fixed without reciprocating, and air at a pressure of 0.08 MPa was continuously supplied from an air compressor connected to one end thereof.

  Except for the above, the operation was continued for 3 months in the same manner as in Example 1. As a result, the cleaning frequency of the belt conveyor has been changed from one month to 1.2 months. The man-hours required to clean the belt conveyor were reduced by 17%.

L Conveyed material layer O Central shaft 1 Head pulley 2 Tail pulley 3 Endless belt 4 Carrier roller 5 Return roller 6 Hopper 10 Air blowing pipe 11, 12 Row of through-hole groups

Claims (6)

A deposit removal device for a belt conveyor that blows air onto a conveyance surface of an endless belt traveling along a path whose conveyance surface is downward, and removes deposits on the conveyance surface,
It comprises at least one air blowing pipe provided across the path and facing the conveying surface of an endless belt running on the path, and each air blowing pipe is substantially equidistant along the central axis direction. There are two rows of through-hole groups perforated, and in the circumferential direction of the air blowing pipe, one of these two rows is at an angular position closest to the conveying surface of the endless belt, and the other is the A deposit removal device for a belt conveyor, which is spaced from the angular position upstream of the endless belt by a central angle of 30 to 60 °.   2. The belt conveyor according to claim 1, wherein the through hole groups in each row arranged along the central axis direction of the air blowing pipe are equally arranged with an interval of 30 to 50 mm. Deposit removal device.   3. The air blowing pipe is capable of reciprocating in a longitudinal direction thereof, and a stroke distance thereof is the same as an interval at which the through-hole groups in each row are uniformly arranged. The belt conveyor deposit removal apparatus described in 1.   The belt conveyer deposit removal device according to claim 3, wherein two or three air blowing pipes are provided at intervals in the conveying direction of the endless belt.   The belt conveyor deposit removing device according to claim 4, wherein the air blowing from the air blowing pipe is intermittent.   After blowing air from a direction inclined by 30 to 60 ° in the traveling direction with respect to the conveying surface of the endless belt traveling on a path whose conveying surface is downward, air is blown from a substantially vertical direction. A method for removing deposits on a belt conveyor.

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