JP2012066939A - Pipe conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe conveyor detecting the twisting of a conveying belt and improving closure stop properties of the conveying belt.SOLUTION: Permanent magnets 6, 7 are provided at either one of facing surfaces of both side parts 3a, 3b of a conveying belt 3 overlapping with each other when rounded into a pipe shape. Regions of the outer periphery of the conveying belt 3 are classified into a permissible zone A, an impermissible zone B, and an intermediate zone C. A stationary body in a place where the conveying belt 3 passes through is provided with a plurality of magnetic sensors 8 adjacent each other in a circular ring shape surrounding the conveying belt 3, for detecting the intensity of magnetic force upon the passage of the permanent magnets 6, 7. A twist determination means 11 is provided, which compares the intensities of the magnetic force detected by the respective magnetic sensors 8, determines that the twist of the conveying belt 3 exceeds a permissible limit when the magnetic sensor 8 provided at the impermissible zone detects a peak value P1 of the magnetic force, and determines that the twist of the conveying belt 3 falls into an alert state when the magnetic sensor 8 provided at the intermediate zone detects the peak value P1 of the magnetic force.

Description

  The present invention relates to a pipe conveyor in which a part of an endless belt-shaped conveyor belt that circulates is rounded into a pipe shape, and an object to be conveyed is wrapped and conveyed therein.

In a conventional air levitation belt conveyor, permanent magnets (magnetic materials) are provided on both sides of a conveyor belt that is configured to run in a bowl shape, and the above-mentioned fixed body at the location where the conveyor belt passes is described above. A number of magnetic sensors that detect the strength of the magnetic force when the permanent magnet passes are arranged in a circumferential direction surrounding the conveyor belt, and the meandering of the conveyor belt is detected based on the output difference of each magnetic sensor. (For example, refer to Patent Document 1).
JP-A-9-169423

  However, in what is described in Patent Document 1, since a large number of magnetic sensors must be used, their support structure is complicated and the cost is high.

  In addition, in a pipe conveyor in which a part of the conveyor belt is rolled and conveyed, a part of the rolled conveyor belt may be crushed inward due to its own weight or stress. Does not describe at all about the detection of the inward collapse of the conveyor belt.

  In view of the above-mentioned problems of the conventional technology, the present invention can easily and efficiently detect the twist of a rounded conveyor belt, and can be closed when the conveyor belt is rolled into a pipe shape. An object of the present invention is to provide a pipe conveyor that can be improved.

According to the present invention, the above problem is solved as follows.
(1) In a pipe conveyor in which a part of an endless belt-shaped transport belt that circulates is rounded into a pipe shape, and the object to be transported is wrapped inside and transported.
Permanent magnets are provided on either one of the opposing surfaces of both sides of the conveyor belt that overlap each other when rolled into a pipe shape, and an outer peripheral region of the conveyor belt at a location where the conveyor belt rounded into a pipe passes is provided. A permissible zone that allows movement of the overlapping portions on both sides of the transport belt within a permissible range of twist of the transport belt, a non-permissible zone other than that, and an intermediate zone between the permissible zone and the non-permissible zone, And a plurality of magnetic sensors for detecting the strength of the magnetic force when the permanent magnet passes are adjacent to each other in a fixed body where the conveying belt rounded into a pipe passes, It is arranged in an annular shape surrounding the zone, and the strength of the magnetic force detected by each magnetic sensor is compared, and the magnetic sensor arranged in the non-permissible zone detects the peak value of the magnetic force. When it is determined that the twist of the conveyor belt has exceeded the allowable limit, and the magnetic sensor disposed in the intermediate zone detects the peak value of the magnetic force, the twist of the conveyor belt is in a state of caution. A twist discriminating means for discriminating this is provided.

(2) In the above item (1), overlapping portions of magnetic sensors are provided between adjacent zones, and the permanent magnets provided on the conveyor belt are opposed to the overlapping portions so that the adjacent magnetic sensors are substantially the same. When the peak value of the size is detected, the twist determining means determines that the overlapping portion of the transport belt is located at the boundary portion between the adjacent zones.

(3) In the above item (1) or (2), a magnetic sensor comprising a single loop coil is disposed in each zone.

(4) In any one of the above items (1) to (3), a permanent magnet is provided on either one of the opposing surfaces of both sides of the conveyor belt that overlap each other when rolled into a pipe shape, and on the other side, A magnetic material that can be attracted to the permanent magnet is provided.

According to the present invention, the following effects can be achieved.
According to the first aspect of the present invention, since one magnetic sensor has only to be provided in each zone, it is not necessary to provide a large number of magnetic sensors as in the prior art, and twisting of the rolled conveyor belt can be easily performed. , Can be detected efficiently.
In addition, it is easy to know that the twist of the conveyor belt has exceeded the allowable range, so that the alarm device (outside the configuration requirements) is activated or the pipe conveyor is deactivated (same as above). The occurrence of accidents can be prevented in advance.
Furthermore, the degree of twisting of the conveyor belt can be determined more finely and accurately.

  According to the second aspect of the present invention, the degree of twist of the conveyor belt can be determined more precisely and accurately without increasing the number of magnetic sensors.

  According to the third aspect of the present invention, it is possible to accurately obtain necessary and sufficient information without providing a large number of magnetic sensors only by arranging magnetic sensors each composed of a single loop coil in each zone. it can.

  According to the fourth aspect of the present invention, the permanent magnets provided on either one of the opposing surfaces of the both sides of the transport belt are attracted to the magnetic material provided on the other side, so that both sides of the rolled transport belt are mutually connected. It is possible to prevent the opening from being opened and to improve the closing property of the inside thereof, and to prevent the conveyed object from being scattered.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 and 2 show a first embodiment of the present invention.
As shown in FIG. 1, this pipe conveyor has a front pulley (1) and a rear pulley (2) wound around an endless belt-like transport belt (3), and the front pulley (1) and the rear pulley (2 ) Is rotated by a driving means (not shown) such as a motor to circulate the conveyor belt (3), and the carrier side which is the upper traveling portion of the conveyor belt (3), and the lower side By passing through the inside of a large number of guide frames (all not shown) in which a plurality of guide rollers are arranged in an annular shape or a bowl shape, an intermediate portion on the return side, which is a traveling portion, is provided. The side (3a) of one side (3a) is brought into contact with the back of the other side (3b) so that both sides (3a) (3b) are rounded into a pipe shape that overlaps with each other. In this, the object to be conveyed (5) supplied from the hopper (4) disposed above the rear pulley (2) is wrapped. It is adapted to transport.

  The magnetic adsorbents are placed on the opposite surfaces of the surface of one side (3a) of the conveyor belt (3) that overlaps with each other when rolled into a pipe and the back of the other side (3b). A plurality of permanent magnets (6) and (7) formed are embedded at an appropriate interval in the longitudinal direction of the conveyor belt (3) so that the polarities of the opposing surfaces are different.

In the first embodiment, as shown in FIG. 2, the upper surfaces of all permanent magnets (6) provided on both side portions (3a) and (3b) of the conveyor belt (3) when rolled into a pipe shape are N The pole and the lower surface are S poles.
However, all of these polarities may be reversed, or the polarities may be reversed one by one along the longitudinal direction of the transport belt (3). Moreover, you may form any one among permanent magnets (6) and (7) with magnetic bodies, such as an iron plate.
Further, in this example, as shown in FIGS. 1 and 2, the two permanent magnets (6) and (7) overlap each other in the overlapping portion of the conveyor belt (3) when the conveyor belt (3) is rolled. For example, the positions of the conveyor belts (3) are shifted from each other in the longitudinal direction and alternately arranged, or further, the positions of the rolled conveyor belts (3) are also shifted in the circumferential direction to make a staggered arrangement. It may be arranged in a shape.

  A fixed body (not shown) provided at an appropriate position in a region through which the transport belt (3) rounded into a pipe passes, as shown in FIG. 2, the magnetic force when the permanent magnets (6) and (7) pass through. A plurality of magnetic sensors (8) for detecting the strength of the belt are provided close to the conveyor belt (3) and arranged in the circumferential direction surrounding the conveyor belt (3).

In this example, the magnetic sensor (8) has eight loop coils (8-1) to (8-8).
In addition, the outer peripheral area of the conveyor belt (3) where the conveyor belt (3) rounded into a pipe passes passes through the overlapping portions (3c) of both sides (3a) and (3b) of the conveyor belt (3). It is divided into the permissible zone (A) for twisting movement and the other non-permissible zone (B). The permissible zone (A) has three loop coils (above and on both sides) 8-4) (8-5) (8-6), and in the non-permissible zone (B), the other five (8-1) to (8-3) (8-7) (8 -8) is provided.

  Each of the loop coils (8-1) to (8-8) (hereinafter referred to as a magnetic sensor (8) unless otherwise specified) is connected to a discriminating means (twist and crush discriminating means) (9). The strength of the magnetic force detected by them is displayed on the display (10) connected to the discriminating means (9) corresponding to each of the loop coils (8-1) to (8-8). It has become so.

The discriminating means (9) includes a twist discriminating means (11) and a crushing discriminating means (12).
The twist discriminating means (11) compares the strength of the magnetic force detected by the magnetic sensor (8), and discriminates the twist of the conveyor belt (3) based on the position of the magnetic sensor (8) that detected the peak value.

  That is, in the state where there is no twist shown by the solid line in FIG. 2, the overlapping portion (3c) of the conveyor belt (3) is located directly above, and the permanent magnets (6) and (7) are close to the loop coil (8-5). Therefore, a peak value (P1) is generated on the fifth line corresponding to the loop coil (8-5) on the display (10) as shown by the solid line in FIG. Since the other loop coils (8-1) to (8-4) and (8-6) to (8-8) are separated from the permanent magnets (6) and (7), the display (10 ) The first to fourth lines and the sixth to eighth lines above are almost straight lines with little unevenness.

  When the twist discriminating means (11) detects that the peak value (P1) has occurred in the detected value of the loop coil (8-5), the overlapping portion (3c) of the conveyor belt (3) It can be seen that it is located within the range facing to 8-5), that is, the conveyor belt (3) is hardly twisted.

  In the state where the conveyor belt (3) is twisted, for example, the overlapping portion (3c) of the conveyor belt (3) is displaced approximately 90 degrees to the left from the state indicated by the solid line as indicated by the imaginary line in FIG. When it passes, the peak value (P2) (see the display in the display (10) in FIG. 2) is generated in the detected value of the loop coil (8-3) facing the overlapping portion (3c) at that time, By detecting the twist discriminating means (11), the overlapping portion (3c) of the conveyor belt (3) is located within the range facing the loop coil (8-3), that is, the conveyor belt (3). It can be determined that the torsion has exceeded an allowable limit.

  Further, the overlapping portion (3c) of the conveyor belt (3) twists the conveyor belt (3) to the position facing the loop coil (8-4) or (8-6), and the loop coil (8-4) or ( When the peak value is detected in 8-6), it can be determined that the conveyor belt (3) is twisted to some extent although it is within the allowable range.

  When the twist discriminating means (11) detects that the twist of the conveyor belt (3) exceeds the allowable range, the alarm device (13) connected to the discriminating means (9) is operated, or the pipe conveyor It is preferable to operate an operation stop device (14) for stopping the entire operation.

Based on the absolute value of the peak value (P1) of the magnetic force detected by the magnetic sensor (8), the crushing discrimination means (12) displaces the overlapping portion (3c) of the conveyor belt (3) inward in the radial direction. That is, it is determined that the pipe has been crushed.
In this example, the absolute value of the peak value (P1) of the magnetic force detected by the magnetic sensor (8) (the amplitude of the peak value (P1 in the display in the display (10) in FIG. 2)) is a preset limit. By being lower than the value (D), it is determined that the overlapping portion (3c) of the conveyor belt (3) is displaced inward.

  When this crushing determination means (12) detects that the conveyance belt (3) has been crushed, it is determined in the same manner as when the torsion determination means (11) detects torsion of the conveyance belt (3). The alarm device (13) connected to the means (9) may be operated, or the operation stop device (14) for stopping the operation of the entire pipe conveyor may be operated.

According to the first embodiment, the permanent magnets (6) and (7) (only one of them) provided on both sides (3a) and (3b) of the conveyor belt (3) are effectively used, The twist of the rounded conveyor belt (3) can be detected easily and efficiently. Further, it is possible to detect that the overlapping portion (3c) of the rolled transport belt (3) is displaced inward without adding a dedicated sensor or the like, that is, the collapse of the transport belt (3). .
Moreover, in the first embodiment, when the conveyor belt (3) is rolled into a pipe shape, the permanent magnets (6) (7) provided on both sides (3a) (3b) of the conveyor belt (3) are mutually connected. Since it overlaps and adsorbs, both sides (3a) and (3b) of the rolled conveyor belt (3) can be prevented from opening each other, and the internal closing performance can be improved. It is possible to prevent the conveyed object (5) from scattering.

  Further, the outer peripheral area of the conveyor belt (3) is divided into a permissible zone (A) and a non-permissible zone (B), and a magnetic sensor (8) is disposed in each zone (A) (B). Therefore, it is possible to easily know that the twist of the conveyor belt (3) has exceeded the allowable range, thereby operating the alarm device (13) or stopping the operation of the pipe conveyor (14). ) To prevent accidents from occurring.

  FIG. 3 shows a second embodiment of the present invention. Note that the same members as those in the first embodiment are denoted by the same reference numerals and are not shown in the figure, and detailed description thereof is omitted (the same applies to the third embodiment).

  In this example, intermediate zones (C) and (C) are provided between the above-described permissible zone (A) and non-permissible zone (B), and the non-permissible zone (B), intermediate zone (C), permissible zone ( A) A magnetic sensor (8) comprising a single loop coil (8-1) (8-2) (8-3) (8-4) is arranged in the order of the intermediate zone (C). When the loop coil (8-2) (8-4) arranged in the zone (C) detects the peak value of the magnetic force, the torsion determination means (11) indicates that the conveyor belt (3) needs to be twisted. It is determined that it has become.

  In this example, the alarm device (13) includes a blue lamp (13a), a yellow lamp (13b), and a red lamp (13c), and the discrimination means (11) twists the conveyor belt (3). Is within the permissible range (permissible zone (A)), the blue lamp (13a) lights up and the conveyor belt (3) is in a state of caution (intermediate zone (C)), the yellow lamp (13b) lights up or flashes, the twist of the conveyor belt (3) exceeds the allowable range, and is in a dangerous state (non-permissible zone (B )) Is determined, the red lamp (13c) is lit or blinking.

  With such a configuration, the degree of twist of the transport belt (3) can be determined more finely and accurately than those having only two zones, the permissible zone (A) and the non-permissible zone (B).

FIG. 4 shows a third embodiment of the present invention.
In this example, the outer peripheral area of the conveyor belt (3) where the conveyor belt (3) rounded into a pipe passes is divided into two zones, a permissible zone (A) and a non-permissible zone (B). In each zone (A) and (B), a magnetic sensor (8) comprising a single loop coil (8-1) and (8-2) is disposed, and adjacent zones (A) and (B) are arranged. A superposition part (20) of the magnetic sensor (8) is provided in between, and the permanent magnets (6) and (7) provided on the conveyor belt (3) are opposed to the superposition part (20) so as to be adjacent to each other. When the sensors (8) and (8) detect the peak values (P1) and (P2) (see the display in the display (10) in FIG. 4) having substantially the same magnitude, the torsion discrimination means (11) The superposition part (3c) of 3) is configured to discriminate a state of caution that is located at the boundary between adjacent zones (A) and (B).

  With such a configuration, only two magnetic sensors (8) are required, and the conveyor belt is substantially as fine as in the second embodiment using four magnetic sensors (8). The degree of twist (3) can be accurately determined.

  In the second embodiment described above, the magnetic sensor (8) is provided between the adjacent zones (A) (B), (B) (C), (C) (D), (D) (A). ), And the permanent magnets (6) and (7) provided on the conveyor belt (3) are opposed to the superposed portion (20) so that the magnetic sensors (8) and (8) are adjacent to each other. Detects a peak value of approximately the same magnitude, the twist discriminating means (11) discriminates that the overlapped portion (3c) of the conveyor belt (3) is located at the boundary between adjacent zones. By doing so, the degree of twist of the transport belt (3) can be determined more finely and accurately.

As mentioned above, although three embodiment of this invention was described, these are the illustrations of this invention, In the range which does not deviate from a claim, various structures other than the above are employable.
For example, any one of the twist determining means (11) and the crush determining means (12) in the determining means (9) may be omitted.

It is a perspective view which shows the outline | summary of the 1st Embodiment of this invention. It is a schematic explanatory drawing which similarly shows the expanded longitudinal section of the principal part, and block diagrams, such as a discrimination means. FIG. 4 is a schematic explanatory view similar to FIG. 2 in the second embodiment of the present invention. It is a schematic explanatory drawing similar to FIG. 2 in the 3rd Embodiment of this invention.

(A) Allowable zone
(B) Non-permissible zone
(C) Intermediate zone
(1) Front pulley
(2) Rear pulley
(3) Conveyor belt
(3a) (3b) side
(3c) Polymerization part
(4) Hopper
(5) Conveyed object
(6) (7) Permanent magnet (magnetic adsorbent)
(8) Magnetic sensor
(8-1) to (8-8) Loop coil
(9) Discrimination means
(10) Display
(11) Torsion discrimination means
(12) Crush detection means
(13) Alarm device
(13a) Blue lamp
(13b) Yellow lamp
(13c) Red lamp
(14) Operation stop device
(20) Polymerization part

Claims (4)

In a pipe conveyor in which a part of an endless belt-shaped conveyor belt that circulates is rounded into a pipe shape, and an object to be conveyed is wrapped and conveyed inside the pipe conveyor,
Permanent magnets are provided on either one of the opposing surfaces of both sides of the conveyor belt that overlap each other when rolled into a pipe shape, and an outer peripheral region of the conveyor belt at a location where the conveyor belt rounded into a pipe passes is provided. A permissible zone that allows movement of the overlapping portions on both sides of the transport belt within a permissible range of twist of the transport belt, a non-permissible zone other than that, and an intermediate zone between the permissible zone and the non-permissible zone, And a plurality of magnetic sensors for detecting the strength of the magnetic force when the permanent magnet passes to a fixed body at a location where the conveyor belt rounded into a pipe passes, and adjacent to each other, It is arranged in an annular shape surrounding the conveyor belt, and the strength of the magnetic force detected by each magnetic sensor is compared, and the magnetic sensor arranged in the non-permissible zone detects the peak value of the magnetic force. When it is determined that the twist of the conveyor belt has exceeded an allowable limit, and the magnetic sensor disposed in the intermediate zone detects the peak value of the magnetic force, the conveyor belt is twisted. A pipe conveyor comprising a twist discriminating means for discriminating the fact.   When the overlapping part of the magnetic sensor is provided between the zones adjacent to each other, the permanent magnet provided on the conveyor belt is opposed to this overlapping part, and the adjacent magnetic sensors detect peak values of almost the same size, 2. The pipe conveyor according to claim 1, wherein the twist determining means determines that the overlapping portion of the conveyor belt is located at a boundary portion between the adjacent zones.   The pipe conveyor according to claim 1 or 2, wherein a magnetic sensor comprising a single loop coil is disposed in each zone.   4. A permanent magnet is provided on one of the opposing surfaces of both sides of the conveyor belt that overlap each other when rolled into a pipe shape, and a magnetic material that can be attracted to the permanent magnet is provided on the other. The pipe conveyor according to any one of the above.

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