JP6170403B2 - Belt deviation detection device and belt deviation detection method - Google Patents

Description

  The present invention relates to a belt deviation detecting device and a belt deviation detecting device that are arranged in a floating belt conveyor device that floats in a belt support trough and travels in a curved state, and detects the deviation of the belt in the belt support trough. It relates to a detection method.

  2. Description of the Related Art Conventionally, a floating belt conveyor device is used in which a gas such as compressed air is supplied to the lower surface of a belt in a pair of belt support troughs so that the belt travels in a floating state and conveys an object to be conveyed. In such a floating belt conveyor device, the belt may meander during operation and may not operate smoothly.

  It has been clarified that such meandering of the belt occurs due to various causes such as a deviation of a conveyed object placed on the belt. And if the belt runs meandering in the belt support trough due to meandering, not only will there be an increased risk of the transported object falling, but there will also be uneven wear on the belt and trough inner peripheral surface, etc. There is a case.

  On the other hand, in a general belt conveyor, for detecting that the belt has shifted in order to correct the meandering of the belt, for example, a belt deviation control device (see Patent Literature 1 below) or a meandering correction device (see Patent Literature 2 below). See). The belt offset control device detects the position of the end of the belt in a non-contact manner with one light emitting element and two light receiving elements, and the meandering correction device detects the position of the end of the belt with a contact type detection sensor. It has a configuration.

JP 2000-327161 A JP 2000-118663 A

  However, in the belt deviation control device disclosed in Patent Document 1, it is necessary to arrange a light emitting element and a light receiving element in the vertical direction with respect to the end portion of the belt, and meandering disclosed in Patent Document 2 described above. In the correction device, it is necessary to dispose detection sensors at both ends of the belt so as to be in contact with each other. For this reason, when it tries to arrange | position in the belt support trough of a floating type belt conveyor apparatus, there exists a problem that it cannot arrange in a desired location, since an arrangement space is limited.

  Also, depending on the type of object to be transported, the explosion-proof property in the belt support trough may be required. Therefore, the above-mentioned elements and sensors that require electric power, or parts such as electric wiring are actively installed in the belt support trough. It may be difficult to arrange the parts in an explosion-proof structure, and there is a problem that if the parts are made in an explosion-proof structure, the structure becomes expensive.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a belt deviation detection device and a belt deviation detection method that eliminate the above-described problems caused by the prior art and that can be configured at low cost with a high degree of freedom in arrangement and safety.

  The belt deviation detecting device according to the present invention includes a cylindrical belt support trough provided with a plurality of gas injection holes in the belt traveling direction, and a curved lower inner peripheral surface in the belt support trough. A loop-shaped belt that travels in a curved state along an inner peripheral surface, and is disposed on a floating belt conveyor device that travels in a state where the belt floats by ejecting gas from the gas injection hole. A belt offset detecting device for detecting a deviation of the belt in the belt support trough, the trough wall being located above both end positions in the width direction during steady running of the belt on the lower inner peripheral surface A transmission type photoelectric sensor having a pair of light projecting parts and a light receiving part that irradiates and receives light in a direction horizontally intersecting with the axial direction of the belt support trough provided on the outer wall side of the belt Characterized in that it comprises.

  According to the belt deviation detecting device of the present invention, the belt support trough is disposed on the outer wall side of the trough wall portion positioned above the both ends in the width direction during the steady running of the belt on the lower inner peripheral surface of the belt support trough. Since the transmission type photoelectric sensor having a pair of light projecting portions and light receiving portions that irradiate and receive light in a direction that intersects horizontally with respect to the axial direction of the belt is provided, components such as electric wiring are provided in the belt support trough. Since there is no need and it can arrange | position in a desired position, without providing an explosion-proof structure, it can be comprised cheaply with a high arrangement | positioning freedom degree and safety | security.

  In one embodiment of the present invention, the pair of light projecting portions and light receiving portions are cylindrical with bottoms attached to the outer wall side of the hole portion formed in the trough wall portion so as to cover the hole portion from the outside. Are attached in a state of facing each other in the crossing direction.

  In another embodiment of the present invention, a gas supply pipe for supplying blow gas into the cylindrical space of the mounting portion is further provided.

  In still another embodiment of the present invention, a transparent spacer for closing the hole side of the cylindrical space of the attachment portion is further provided.

  The belt offset detection method according to the present invention includes a cylindrical belt support trough provided with a plurality of gas injection holes in the belt traveling direction, and a curved lower inner peripheral surface in the belt support trough. A loop-shaped belt that travels in a curved state along an inner peripheral surface, and is disposed on a floating belt conveyor device that travels in a state where the belt floats by ejecting gas from the gas injection hole. A belt shift detection method for detecting a shift of the belt in the belt support trough by a belt shift detection device, wherein the belt is shifted from both end positions in the width direction during steady running of the belt on the lower inner peripheral surface. A shaft of the belt support trough from the light projecting unit by a transmission type photoelectric sensor having a pair of light projecting unit and light receiving unit provided on the outer wall side of the trough wall unit positioned above Light is irradiated in a direction intersecting horizontally relative direction, and detects the deviation of the belt by detecting the presence or absence of light reception by the light receiving portion of the irradiated light.

  According to the belt deviation detection method of the present invention, the same operational effects as the belt deviation detection device can be obtained.

  According to the present invention, the arrangement flexibility and safety are high, and it can be configured at low cost.

It is a schematic side view which shows the floating type belt conveyor apparatus provided with the belt deviation detection apparatus which concerns on one Embodiment of this invention. It is A-A 'sectional drawing of FIG. FIG. 3 is a partially enlarged view of FIG. 2. It is sectional drawing which shows the detection operation | movement by the belt deviation detection apparatus. It is sectional drawing which shows the other structure of the same belt deviation detection apparatus. It is sectional drawing which shows other structure of the belt deviation detection apparatus.

Hereinafter, with reference to the accompanying drawings, a belt deviation detection device and a belt deviation detection method according to embodiments of the present invention will be described in detail.
FIG. 1 is a schematic side view showing a floating belt conveyor apparatus provided with a belt deviation detecting device according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA ′ of FIG. 1, and FIG. 3 is a partially enlarged view of FIG. In addition, although the floating type belt conveyor apparatus in this embodiment has mentioned what was equipped with what is called a belt inversion apparatus as an example, even if it does not comprise this, it is possible to apply this invention.

  As shown in FIGS. 1 and 2, a floating belt conveyor device (hereinafter referred to as “belt conveyor”) 10 provided with a belt offset detection device 1 according to the present embodiment mainly forms a pair of upper and lower sides. A cylindrical carrier side belt support trough (hereinafter referred to as “carrier trough”) 20 and a U-shaped cylindrical return side belt support trough (hereinafter referred to as “return trough”) 30, and these carrier trough and return And a loop-shaped (endless) belt 40 arranged to pass through the troughs 20 and 30.

  The floating belt conveyor device 10 is compressed from a plurality of gas injection holes 21 and 31 (see FIG. 2) formed at predetermined intervals along the traveling direction of the belt 40, for example, below the carrier trough and return troughs 20 and 30. A structure in which the curved lower inner peripheral surfaces 21a and 31a of the carrier trough and return troughs 20 and 30 and the lower surface 41 of the belt 40 are separated from each other by ejecting a gas such as air and the belt 40 is floated. It has.

  Below the gas injection holes 21, 31, gas ducts 51, 61 extending in the running direction of the belt 40 are disposed, and to the gas ducts 51, 61, air supply pipes 52, 62 are connected. A gas such as compressed air is supplied to the air supply pipes 52 and 62 from a gas supply device (not shown). The gas supplied from the gas injection holes 21 and 31 to the internal spaces of the troughs 20 and 30 is discharged to the outside through the exhaust pipes 53 and 63 provided in the troughs 20 and 30.

  Further, the levitation belt conveyor device 10 has a flat belt 40 bent in a U-shaped (arc) cross-sectional shape on the inlet and outlet sides of the belt 40 at the terminal ends of the carrier trough and the return troughs 20 and 30, respectively. A belt bending guide device 50 is provided.

  In the belt bending guide device 50, when the belt 40 becomes flat in the carrier trough and the return trough 20, 30, for example, both end portions in the width direction of the belt 40 are strongly rubbed against the lower inner peripheral surfaces 21a, 31a, The belt 40 and the lower inner peripheral surfaces 21a and 31a are installed to prevent uneven wear.

  Further, the floating belt conveyor device 10 is provided with a belt reversing device 60 that reverses the belt 40 at the start and end of the return trough 30. The belt reversing device 60 is provided in order to prevent the both end portions in the width direction of the belt 40 from being rubbed strongly against the lower inner peripheral surface 31a of the return trough 30 and being unevenly worn as described above.

  That is, the return trough 30 moves in the long distance from the supply port 71 to the discharge port 72 while loading the conveyed object N while the belt 40 traveling in the carrier trough 20 is held in a U-shaped cross section. This is because if the belt 40 traveling inside is introduced into the return trough 30 as it is, the belt 40 passing through the return trough 30 has an inverted U-shaped cross section rather than a flat shape.

  The floating belt conveyor device 10 includes a supply side chute cover 73 and a tail pulley 74 on the supply port 71 side of the object to be conveyed N, and an end cover 75 and a discharge side chute on the discharge port 72 side of the object to be conveyed N. A cover 76 and a head pulley 77 are provided.

  On the other hand, the belt deviation detecting device 1 is provided on the outer wall side of the trough wall portion 22 around the intermediate portion of the carrier trough 20 of the floating belt conveyor device 10, for example, and detects the deviation of the belt 40 traveling in the carrier trough 20. It is to detect. The belt misalignment detection device 1 includes a fiber-type transmissive photoelectric sensor having a pair of light projecting units 2 and light receiving units 3.

  As shown in FIGS. 2 and 3, the pair of light projecting unit 2 and light receiving unit 3 are attached to the outer wall side of the trough wall portion 22 of the carrier trough 20 from the outside of the trough wall portion 32 of the return trough 30, for example. Is provided. Specifically, the light projecting unit 2 and the light receiving unit 3 are formed on the trough wall portion 22 above the positions of the width direction end portions 41 and 42 during the steady running of the belt 40 on the lower inner peripheral surface 21a. The direction of the axis P of the carrier trough 20 with respect to the bottom portion 24a of the bottomed cylindrical attachment portion 24 attached through the hole portion 23 through the hole portion 33 of the trough wall portion 32 so as to cover the hole portion 23 from the outside. Are attached by a nut 99 or the like so that the detection light L can be irradiated and received in a direction that intersects horizontally.

  In this example, the cylindrical space 24b of the mounting portion 24 is blocked from the outside of the carrier trough 20 and the return trough 30, but the carrier trough is formed through the hole 23 formed in the trough wall portion 22. It communicates with 20 internal spaces. In the belt deviation detecting device 1 configured as described above, the deviation is detected as follows.

  FIG. 4 is a cross-sectional view showing a detection operation by the belt deviation detection device. As shown in FIG. 4A, for example, when the belt 40 traveling in the carrier trough 20 is shifted to the light receiving unit 3 side, the end 42 of the belt 40 is located above the hole 23 on the light receiving unit 3 side. Therefore, the detection light L from the light projecting unit 2 is blocked by the belt 40 and is not received by the light receiving unit 3.

  As shown in FIG. 4B, for example, when the belt 40 traveling in the carrier trough 20 is shifted to the light projecting unit 2 side, the end 41 of the belt 40 is the hole 23 on the light projecting unit 2 side. Therefore, the detection light L from the light projecting unit 2 is similarly blocked by the belt 40 and is not received by the light receiving unit 3.

  As described above, the detection light L is received by the light receiving unit 3 even when the belt 40 is shifted to either side of the both end portions 41 and 42 on the lower inner peripheral surface 21 a inside the carrier trough 20. Therefore, it is possible to easily detect the deviation by detecting the presence or absence of this light reception.

  Therefore, according to the floating belt conveyor apparatus 10 including the belt deviation detection device 1 according to the present embodiment, the deviation detection device 1 that detects the deviation of the belt 40 is disposed on the outer wall side of the trough wall portion 22. Since it is composed of a fiber-type transmission photoelectric sensor having a pair of the light projecting unit 2 and the light receiving unit 3, there is no need to dispose the belt deviation detecting device 1 in the carrier trough 20, and the belt running surface has a sealed structure. The curved carrier trough 20 can be easily disposed at a desired position without providing an explosion-proof structure. For this reason, the belt deviation detecting device 1 can be applied to, for example, a zero-type place (so-called zone 0) where an intrinsically safe explosion-proof structure is required as a dangerous place. The belt deviation detecting device 1 with high performance can be configured at low cost.

  FIG. 5 is a cross-sectional view showing another configuration of the belt deviation detecting device. As shown in FIG. 5, it is good also as a structure which connected each gas supply pipe | tube 68 which supplies blow gas in the cylindrical space 24b to each attachment part 24 with which the light projection part 2 and the light-receiving part 3 were provided. If comprised in this way, the light projection part 2 and the light-receiving part 3 can be easily cleaned with blow gas, and the misdetection and malfunction by dust etc. adhering to a transmission type photoelectric sensor can be prevented. In addition, the temperature of the internal atmosphere of the carrier trough 20 can be adjusted to some extent by this blow gas.

  FIG. 6 is a cross-sectional view showing still another configuration of the belt deviation detecting device. As shown in FIG. 6, a transparent spacer 69 made of acrylic or the like that closes the hole 23 side of the cylindrical space 24b is arranged on each mounting part 24 provided with the light projecting part 2 and the light receiving part 3 respectively. It is good also as a structure. If comprised in this way, a transmissive photoelectric sensor can be completely isolated from the internal atmosphere of the carrier trough 20, and it can be set as the structure which is not influenced by an internal atmosphere. In this case, since the explosion-proof property in the cylindrical space 24b can be ensured by the spacer 69, the present invention can be applied even if, for example, the type of the transmissive photoelectric sensor is replaced with one that requires electrical wiring or the like.

  In the above-described embodiment, the description has been given by taking as an example the application of the belt deviation detection device 1 to the floating belt conveyor device 10 in which the carrier trough 20 and the return trough 30 are arranged in a pair of upper and lower sides. The present invention can be applied even when the troughs 20 and 30 are arranged in the horizontal direction or when only one of the troughs 20 and 30 is provided. Moreover, although the structure which has arrange | positioned the belt deviation detection apparatus 1 only to the carrier trough 20 side was demonstrated, you may make it arrange | position also to the return trough 30 side.

DESCRIPTION OF SYMBOLS 1 Belt deviation detection apparatus 2 Light projection part 3 Light reception part 10 Levitation type belt conveyor apparatus 20 Carrier side belt support trough 21 Gas injection hole 21a Lower inner peripheral surface 22 Trough wall part 23 Hole part 24 Attachment part 24a Bottom part 24b Cylindrical space 30 return side belt support trough 31 gas injection hole 31a lower inner peripheral surface 32 trough wall portion 33 hole portion 40 belt 41, 42 end portion

Claims (1)

A cylindrical belt support trough having a plurality of gas injection holes arranged in the belt traveling direction, and a curved lower inner peripheral surface of the belt support trough in a state curved along the lower inner peripheral surface. A loop belt that travels, and is disposed on a floating belt conveyor device that travels in a state where the belt floats by ejecting gas from the gas injection hole, and a piece of the belt in the belt support trough A belt deviation detection device for detecting deviation,
A direction horizontally intersecting with the axial direction of the belt support trough provided on the outer wall side of the trough wall portion positioned above the both ends in the width direction during steady running of the belt on the lower inner peripheral surface Ri Do a transmission type photoelectric sensor having a pair of light projecting portion and a light receiving unit which applies light received by,
The pair of light projecting portions and light receiving portions are mutually connected to the bottom portion of the bottomed cylindrical attachment portion attached to the outer wall side of the hole portion formed in the trough wall portion so as to cover the hole portion from the outside. It is attached in a state facing each other in the intersecting direction,
Belt deviation detecting device, characterized in that it further Ru comprising a gas supply pipe for supplying the blow gas into the cylindrical space of the mounting portion.

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