AU2014405666B2

AU2014405666B2 - Conveyor roller having spray function

Info

Publication number: AU2014405666B2
Application number: AU2014405666A
Authority: AU
Inventors: Bok Nam Na
Original assignee: DAEYANG ROLLENT CO Ltd
Current assignee: DAEYANG ROLLENT Co Ltd
Priority date: 2014-09-05
Filing date: 2014-09-05
Publication date: 2019-05-16
Anticipated expiration: 2034-09-05
Also published as: WO2016035912A1; JP2017532270A; CN107074465A; CN107074465B; AU2014405666A1; JP6350844B2

Abstract

The present invention relates to a conveyor roller that has a spray function, comprising: a hollow roller body; a shaft inserted into the roller body and having a hollow portion formed therein for accommodating an extinguishing agent; a bearing provided between the roller body and the shaft to rotatably support the roller body with respect to the shaft; a nozzle member coupled to the shaft to communicate with the hollow portion of the shaft; and a blocking member provided in the shaft to block the extinguishing agent accommodated in the hollow portion from being supplied into the nozzle member, wherein the extinguishing agent leaks to the outside through the nozzle member when the blocking member is broken. In case of overheating or fire, the conveyor roller can spray the extinguishing agent to prevent the overheating and extinguish the fire in an initial stage, and even in the case where the conveyor roller is installed at a hard-to-access place, the conveyor roller can autonomously extinguish a fire.

Description

[description] [invention Title] CONVEYOR ROLLER HAVING SPRAY FUNCTION [Technical Field]

The present invention relates to a conveyor roller, and more particularly, to a conveyor roller having a spray function .

[Background Art]

Generally, a carrier roller conveyor, which is widely used to transfer an object in a variety of industrial fields, includes a plurality of conveyor rollers as a single unit. FIG.l is a longitudinal sectional view showing a conventional conveyor roller 10, wherein the conventional conveyor roller 10 includes stopper rings 12b disposed in circular grooves formed on the positions spaced apart from each other of both ends of a shaft 12, bearings 13 disposed on the outsides of the stopper rings 12b, and end caps 14 disposed on the outsides of the bearings 13 in such a manner as to be coupled unitarily with a roller body part 11. Further, the roller body part 11 has inward flanges 11a curvedly bent inwardly from both ends thereof, so that the end caps 14 are insertedly coupled to the inward flanges 11a formed on both ends of the roller body part 11. The end caps 14 are coupled to the inward flanges 11a by means of welding. A reference numeral '15' in FIG.l denotes a housing member adapted to prevent each bearing 14 from being misaligned when the center line of the shaft 12 and the center line of each end cap 14 do not correspond to each other or are slanted to each other, a reference numeral '18' denotes a cover adapted to support the inner ring of each bearing 13 in an axial direction from the outside, a reference numeral '19' denotes a sealing member disposed inside the cover 18 in the axial direction of the cover 18 to form a labyrinth seal together with the cover 18. The roller body part 11 is a hollow pipe, which may be formed unitarily with the end caps 14. The roller body part 11 and the end caps 14 constitute a roller body, and they are supported against the shaft 12 by means of the bearings 13 in such a manner as to be rotatable with respect to the shaft 12.

Another type of conveyor roller in the conventional practice is disclosed in Korean Utility Model Application No.20-2010-0000112.

As shown in FIG.l and further in FIG.2 of Korean Utility Model Application No.20-2010-0000112, the conventional conveyor roller includes the hollow roller body part 11, the shaft 12 insertedly passing through the roller body part 11, bearings 13 disposed between the roller body part 11 and the shaft 12 to rotatably support the roller body part 11 against the shaft 12, and sealing members disposed outside the bearings 13 in the axial directions of the bearings 13. Of course, the bearings 13 formed unitarily with the seals may be provided, without having any separate sealing members.

The conveyor roller is installed together a conveyor belt in the state where the shaft 12 is supported thereagainst, and when an object to be transferred is placed on the conveyor belt and transferred along the conveyor belt, the conveyor roller supports the underside of the conveyor belt. While the object is being transferred along the conveyor belt, the roller body part 11 rotates with respect to the shaft 12 according to the movement of the conveyor belt in the state where the shaft 12 of the conveyor roller 10 is supported. If the roller body part 11 does not rotate with respect to the shaft 12 by means of the damages of the bearings 13, friction between the roller body part 11 and the conveyor belt occurs to cause a temperature in the conveyor roller 10 to be undesirably raised, so that a fire may happen.

In the conventional practice, it is hard to sense overheating from the conveyor roller 10, thereby failing to in advance prevent a fire from occurring, and if the fire happens, it should be extinguished by means of a fire extinguisher disposed around the conveyor roller 10. Further, if the conveyor roller 10 is installed at a hard-to-access place, initial fire extinguishment fails to seriously cause large fires .

[Disclosure] [Technical Problem]

Accordingly, the present invention has been made in view of the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a conveyor roller having a spray function that is capable of spraying a spraying agent upon overheating or fire occurrence, thereby alarming the fire occurrence, preventing the fire from spreading, and performing initial fire extinguishment. [Technical Solution]

To accomplish the above-mentioned object, according to a first aspect of the present invention, there is provided a conveyor roller having a spray function, including: a hollow roller body having a discharge hole communicating with the outside; a shaft inserted into the roller body; bearings disposed between the roller body and the shaft to rotatably support the roller body against the shaft; a spraying agent disposed in a space portion formed between the roller body and the shaft; and a blocking member adapted to prevent the spraying agent from being discharged to the outside through the discharge hole, wherein if the blocking function of the blocking member is lost, the spraying agent leaks to the outside through the discharge hole.

According to the present invention, desirably, the discharge hole formed on the roller body is formed on the shaft.

According to the present invention, desirably, the blocking member has a shape of a bag located in the space portion formed between the roller body and the shaft, and the spraying agent is accommodated in the bag-shaped blocking member .

According to the present invention, desirably, the blocking member has a shape of a film for blocking the discharge hole, and the spraying agent is accommodated in the space portion formed between the roller body and the shaft and blocked by means of the blocking member from the outside.

According to the present invention, desirably, the shaft includes a reflection member disposed at the outside of the discharge hole in an axial direction thereof in such a manner as to be extended therefrom in a radial direction, so that the spraying agent discharged from the discharge hole collides against the reflection member to permit the motion direction thereof to be changed into the axial direction toward the inside.

According to the present invention, desirably, the blocking member is a release valve for blocking the discharge hole, and the spraying agent is accommodated in the space portion formed between the roller body and the shaft and blocked by means of the blocking member from the outside.

According to the present invention, desirably, the discharge hole is connected to a nozzle member having a shape of a pipe, and if the blocking function of the blocking member is lost, the spraying agent is guided by the nozzle member and discharged to the outside.

To accomplish the above-mentioned object, according to a second aspect of the present invention, there is provided a conveyor roller having a spray function, including: a hollow roller body; a shaft inserted into the roller body and having a hollow portion and a discharge hole adapted to allow the hollow portion to communicate with the outside; bearings disposed between the roller body and the shaft to rotatably support the roller body against the shaft; a spraying agent accommodated in the hollow portion of the shaft; and a blocking member adapted to prevent the spraying agent from being discharged to the outside through the discharge hole, wherein if the blocking function of the blocking member is lost, the spraying agent leaks to the outside through the discharge hole.

According to the present invention, desirably, the blocking member has a shape of a bag located in the hollow portion of the shaft, and the spraying agent is accommodated in the bag-shaped blocking member.

According to the present invention, desirably, the blocking member has a shape of a film for blocking the discharge hole, and the spraying agent is accommodated in the hollow portion blocked by means of the blocking member from the outside.

According to the present invention, desirably, the blocking member is a release valve disposed on the discharge hole to block the discharge hole, and the spraying agent is accommodated in the hollow portion blocked by means of the blocking member from the outside.

According to the present invention, desirably, the shaft includes a needle member having a sharp end portion disposed therein in such a manner as to be extended toward the blocking member .

According to the present invention, desirably, the shaft includes a reflection member disposed in the axial direction toward the outside from the discharge hole in such a manner as to be extended from the shaft in a radial direction, so that if the blocking function of the blocking member is lost, the spraying agent discharged from the discharge hole collides against the reflection member to permit the motion direction thereof to be changed into the axial direction toward the inside.

According to the present invention, desirably, the spraying agent is formed by mixing any one or more of an extinguishing agent, dye, and fluorescent substance.

According to the present invention, desirably, the discharge hole includes whistle means provided thereon.

[Advantageous Effects]

According to the present invention, the conveyor roller having the spray function has the following effects: firstly, the spraying agent is sprayed upon overheating or fire occurrence; secondly, the spraying agent is formed of the extinguishing agent so that when it is sprayed, the fire is extinguished to prevent overheating and achieve initial fire extinguishment; and thirdly, even if the conveyor roller is installed at a hard-to-access place, it can perform self fire extinguishment. According to the present invention, further, the conveyor roller having the spray function has the following effects: the spraying agent is mixed with the fluorescent substances, so that when sprayed, it can be visually sensed; and audible sensing is provided by means of the breakage sound of the blocking member or the sound of the whistle means .

[Description of Drawings] FIG.l is a longitudinal sectional view showing a conventional conveyor roller. FIG. 2 is a longitudinal sectional view showing a conveyor roller having a spray function according to a first embodiment of the present invention. FIG. 3 is a longitudinal sectional view showing a modification of the conveyor roller having a spray function according to the first embodiment of the present invention. FIG.4 is a longitudinal sectional view showing another modification of the conveyor roller having a spray function according to the first embodiment of the present invention. FIG.5 is a longitudinal sectional view showing a conveyor roller having a spray function according to a second embodiment of the present invention. FIG. 6 is a longitudinal sectional view showing a modification of the conveyor roller having a spray function according to the second embodiment of the present invention.

[Mode for Invention]

Hereinafter, an explanation on a conveyor roller having a spray function according to the present invention will be in detail given with reference to the attached drawing. FIG.2 is a longitudinal sectional view showing a conveyor roller having a spray function according to a first embodiment of the present invention, FIG.3 is a longitudinal sectional view showing a modification of the conveyor roller having a spray function according to the first embodiment of the present invention, FIG.4 is a longitudinal sectional view showing another modification of the conveyor roller having a spray function according to the first embodiment of the present invention, FIG.5 is a longitudinal sectional view showing a conveyor roller having a spray function according to a second embodiment of the present invention, and FIG.6 is a longitudinal sectional view showing a modification of the conveyor roller having a spray function according to the second embodiment of the present invention.

In the description, a longitudinal direction of a shaft 105 is defined as an axial direction, a direction toward the center of the shaft 105 in the axial direction as an axial direction toward an inside, and a direction toward both ends of the shaft 105 in the axial direction as an axial direction toward an outside. Further, a direction toward the shaft 105 from a roller body 101 is defined as a radial direction toward an inside, and a direction toward the roller body 101 from the shaft 105 is defined as a radial direction toward an outside .

As shown in FIGS.2 to 4, a conveyor roller having a spray function according to a first embodiment of the present invention includes a roller body, a shaft 105 insertedly passing through the roller body in an axial direction thereof, and bearings 107 for rotatably supporting the roller body against the shaft 105. The bearings 107 are provided between the roller body and the shaft 105 in radial directions thereof in such a manner as to be spaced apart from each other in the longitudinal direction of the shaft 105. The bearings 107 are rolling bearings having rolling elements, and of course, they may be sliding bearings.

The roller body includes a hollow roller body part 101 and cap members 103 disposed on both ends of the roller body part 101 in the axial direction of the roller body part 101. The roller body part 101 is a hollow body having a circular section open on both sides thereof and supports the underside of a conveyor belt thereagainst when installed. The roller body part 101 is made of a metal or plastic. The cap members 103 are inserted into both ends of the roller body part 101 in such a manner that the outside surfaces thereof come into contact with the roller body part 101. The cap members 103 may be inserted into the roller body part 101 by means of force-fitting, and otherwise, the outside surfaces of the cap members 103 are connected to the roller body part 101 by means of welding. Further, the roller body part 101 and the cap members 103 may be formed unitarily with each other. A space is formed radially between the inside surfaces of the cap members 103 and the outer periphery of the shaft 105, and the bearings 107 are disposed between the cap members 103 and the shaft 105. The outer rings of the bearings 107 are fitted to the inside surfaces of the cap members 103 and then come into contact therewith, and the shaft 105 is fitted to the inner rings of the bearings 107 so that the inner rings of the bearings 107 come into contact with the outer periphery of the shaft 105. The shaft 105 is fitted to the inner rings of the bearings 107 by means of forced-fitting. The structure in which the bearings 107 are fixed to the shaft 105 in the axial direction of the shaft 105 is the same as in Korean Patent Application Laid-open No. 10-2011-0127877, and accordingly, an explanation on the structure will be avoided for the brevity of the description. As the bearings 107 are disposed between the roller body and the shaft 105, the roller body is rotatable with respect to the shaft 105. A reference numeral '109' denotes sealing members disposed at the outsides of the bearings 107 in the axial direction to prevent the invasion of foreign substances from occurring. The sealing members 109 are inserted into the cap members 103. The shaft 105 is inserted into the sealing members 109. Each sealing member 109 includes a first sealing member 109a and a second sealing member 109b which form a labyrinth together. Any one of the first sealing member 109a and the second sealing member 109b of the sealing member 109 forming the labyrinth together is fitted to the inside surface of the cap member 103, and the shaft 105 is fitted to the other sealing member. Both ends of the shaft 105 protrude outwardly from the sealing members 109.

According to the present invention, as shown in FIGS.2 to 4, the shaft 105 has a hollow portion formed at the inside thereof and a discharge hole 105a adapted to allow the hollow portion to communicate with the outside. One side end portion of the discharge hole 105a communicates with the hollow portion of the shaft 105, and the other side end portion thereof communicates with the outside. A spraying agent is accommodated in the hollow portion of the shaft 105.

The shaft 105 has the hollow portion formed at the inside thereof and the discharge hole 105a adapted to allow the hollow portion to communicate with the outside. Of course, the discharge holes 105a may be formed on both sides of the shaft 105 in the axial direction of the shaft 105, while interposing the hollow portion therebetween, and otherwise, the discharge hole 105a is formed on one side of the shaft 105 in the axial direction of the shaft 105. The sectional area of the discharge hole 105a is smaller than that of the hollow portion of the shaft 105, so that when the spraying agent accommodated in the hollow portion of the shaft 105 is sprayed, it can be discharged at a high speed.

The discharge hole 105a is extended from the hollow portion of the shaft 105 to the end portion of the shaft 105 in the axial direction toward the outside in such a manner as to communicate with the outside. The discharge hole 105a may be extended from the hollow portion of the shaft 105 in the axial direction toward the outside and then in the radial direction to the end portion of the shaft 105 in such a manner as to communicate with the outside. Otherwise, the discharge hole 105a may be extended from the hollow portion of the shaft 105 in the radial direction and then in the axial direction toward the inside to the end portion of the shaft 105 in such a manner as to communicate with the outside. In the case where the discharge hole 105a is extended from the hollow portion of the shaft 105 to the end portion of the shaft 105 in the axial direction toward the outside, the spraying agent is sprayed in the axial direction toward the outside, that is, in a direction toward which the end portion of the discharge hole 105a is oriented.

According to the present invention, as shown in FIG.6, a reflection member 128 is further provided in such a manner as to be extended from the shaft 105 in the radial direction. The reflection member 128 has a shape of a circular plate slantly formed in such a manner as to become close to the axial direction toward the inside as it goes toward the outside. Of course, the reflection member 128 may be convexedly curved in the axial direction toward the outside. The reflection member 128 may be fixedly disposed at the roller body or the shaft 105. If the reflection member 128 is fixed to the roller body, it rotates together with the roller body. The reflection member 128 is spaced apart from the outside end portion of the discharge hole 105a in such a manner as to be disposed on a position facing the outside end portion of the discharge hole 105a. A reference numeral '128a' in FIG.6 denotes bar-shaped connection members for fixing the plate-shaped reflection member 128. One end of each connection member 128a is connected to the roller body or the shaft 105 and the other end thereof to the reflection member 128, so that the reflection member 128 is fixedly disposed at the roller body or the shaft 105.

As shown in FIG. 6, the discharge hole 105a is extended from the hollow portion of the shaft 105 to the end portion of the shaft 105 in the axial direction toward the outside in such a manner as to communicate with the outside, and the reflection member 128 is spaced apart from the outside end portion of the discharge hole 105a in the axial direction in such a manner as to be disposed on the position facing the outside end portion of the discharge hole 105a, so that the spraying agent discharged from the discharge hole 105a collides against the reflection member 128 to permit the motion direction thereof to be changed into the axial direction toward the inside, and accordingly, the spraying agent is sprayed to the roller body and the shaft 105. If the reflection member 128 is slantly formed in such a manner as to become close to the axial direction toward the inside as it goes toward the outside thereof, the spraying agent collides against the reflection member 128 to permit the motion direction thereof to be changed into the axial direction toward the inside as well as the radial direction toward the inside.

According to the present invention, further, a blocking member 111 is disposed in the shaft 105 to prevent the spraying agent accommodated in the hollow portion of the shaft 105 from leaking to the outside through the discharge hole 105a. As shown in FIGS.2 and 3, the blocking member 111 has a closed bag located in the hollow portion of the shaft 105, and the spraying agent is accommodated in the closed bag-shaped blocking member 111. The blocking member 111 has the shape of the bag by which the closed space is formed, and the spraying agent is accommodated in the closed space of the blocking member 111.

As shown in FIG. 4, the blocking member 111 may have a shape of a film for blocking the discharge hole 105a. The blocking member 111 is attached to a stepped projection formed between the hollow portion and the discharge hole 105a of the shaft 105 to block the discharge hole 105a. The periphery of the blocking member 111 is bonded to the stepped projection. Of course, the blocking member 111 is attached to the end portion of the shaft 105 in the axial direction of the shaft 105 to block the discharge hole 105a. As the discharge hole 105a is blocked by means of the blocking member 111, the spraying agent is accommodated in the hollow portion of the shaft 105 as the space blocked from the outside .

The blocking member 111 is the film made of a synthetic resin like vinyl. The blocking member 111 has notches formed thereon so that it can be easily broken.

According to the present invention, further, a needle member 124 having a sharp end portion is disposed in the shaft 105 in such a manner as to be extended toward the blocking member 111. The needle member 124 is extended toward the blocking member 111 in the axial direction toward the inside. When the needle member 124 is provided, the end portion of the needle member 124 is spaced apart from the blocking member 111. The needle member 124 is fixedly disposed to the hollow portion of the shaft 105.

On the other hand, the blocking member 111 may be formed of a release valve disposed on the discharge hole 105a to block the discharge hole 105a. If the blocking member 111 is formed of the release valve, the release valve is open when the pressure of the hollow portion is increased so that the spraying agent is discharged to the outside through the discharge hole 105a.

As shown in FIGS. 2 to 4, the shaft 105 is formed of a hollow pipe and has a first closing part 130 and a second closing part 120 disposed on both ends thereof, while the hollow portion thereof is being formed between the first closing part 130 and the second closing part 120. The spraying agent is accommodated in the space defined by the blocking member 111, the first closing part 130, the second closing part 120, and the shaft 105 as the hollow pipe.

Of course, one side of the shaft 105 is closed and the other side thereof is open. Otherwise, one side open portion of the shaft 105 is closed just by the first closing part 130 or the second closing part 120.

As shown in FIGS. 2 and 3, the blocking member 111 has the shape of the closed bag made of a synthetic resin like vinyl, and the spraying agent is accommodated in the blocking member 111, so that the blocking member 111 in which the spraying agent is accommodated is inserted into the hollow pipe constituting the shaft 105 in such a manner as to be located between the first closing part 130 and the second closing part 120. The blocking member 111 has a size having given distances from the first closing part 130 and the second closing part 120 in the axial direction. Upon the installation of the blocking member 111, one side of the blocking member 111 in the axial direction comes into contact with the first closing part 130, and the other side thereof is spaced apart from the second closing part 120. Of course, one side of the blocking member 111 in the axial direction may be spaced apart from the first closing part 130, and the other side thereof may come into contact with the second closing part 120. Otherwise, both sides of the blocking member 111 may be spaced apart from the first closing part 130 and the second closing part 120.

The first closing part 130 closing one side end portion of the hollow pipe constituting the shaft 105 includes a first closing member 131 inserted into one end of the hollow pipe and having a screw fastening groove formed concavedly thereon in the axial direction toward the outside, a second closing member 133 inserted into the hollow pipe in such a manner as to be located in the axial direction toward the outside of the first closing member 131 and having a screw hole passed therethrough, and a first fastening screw 135 passed through the screw hole of the second closing member 133 in such a manner as to be extended inwardly in the axial direction and screw-fastened to the screw fastening groove of the first closing member 131. The head portion of the first fastening screw 135 inwardly pressurizes the second closing member 133 in the axial direction.

The first closing member 131 is inserted into the hollow pipe by means of force-fitting, and the second closing member 133 is fixed to the first closing member 131 by means of the screw-fastening of the first fastening screw 135. The second closing member 133 has a first flange portion 133a extended in the radial direction thereof, and the outer diameter of the first flange portion 133a is larger than that of the hollow pipe so that it axially pressurizes the sealing member 109 located at the outside of the bearing 107.

The second closing part 120 closing the other side end portion of the hollow pipe constituting the shaft 105 includes a third closing member 121 inserted into the other end of the hollow pipe and having a screw fastening groove formed concavedly thereon in the axial direction toward the outside, a fourth closing member 123 inserted into the hollow pipe in such a manner as to be located in the axial direction toward the outside of the third closing member 121 and having a screw hole passed therethrough, and a second fastening screw 125 passed through the screw hole of the fourth closing member 123 in such a manner as to be extended inwardly in the axial direction and screw-fastened to the screw fastening groove of the third closing member 121. The head portion of the second fastening screw 125 inwardly pressurizes the fourth closing member 123 in the axial direction.

The third closing member 121 is inserted into the hollow pipe by means of force-fitting, and the fourth closing member 123 is fixed to the third closing member 121 by means of the screw-fastening of the second fastening screw 125. The fourth closing member 123 has a second flange portion 123a extended in the radial direction thereof, and the outer diameter of the second flange portion 123a is larger than that of the hollow pipe so that it axially pressurizes the sealing member 109 located at the outside of the bearing 107. The third closing member 121 has a through hole extended inwardly from the screw fastening groove in the axial direction, and the second fastening screw 125 is formed of a hollow screw having a through hole formed in the axial direction. The needle member 123 is disposed on the inside end portion of the third closing member 121 toward the inside in the axial direction.

The hollow portion of the shaft 105 is formed between the first closing part 130 and the second closing part 120, and the discharge hole 105a, which allows the hollow portion of the shaft 105 to communicate with the outside, is formed by means of the through hole formed in the third closing member 121 and the through hole formed in the second fastening screw 125. The blocking member 111 has the plateshaped film that is attached to the inside end portion of the third closing member 121 in the axial direction by means of an adhesive to block the discharge hole 105a. Of course, both sides of the shaft 105 may have the structure of the second closing part 120, so that the discharge holes 105a may be formed on both sides of the hollow portion of the shaft 105.

The reflection member 128 is disposed on the side at which the discharge hole 105a is formed. The reflection member 128 is spaced apart from the outside end portion of the discharge hole 105a in the axial direction in such a manner as to face the outside end portion of the discharge hole 105a. The reflection member 128 is fixedly disposed at the end portion of the shaft 105 by means of the bar-shaped connection members 128a. One end of each connection member 128a is connected to the shaft 105 and the other end thereof extended in the axial direction is connected to the reflection member 128.

According to a second embodiment of the present invention, as shown in FIG.5, a cylindrical space portion is formed between the inner periphery of a roller body and the outer periphery of a shaft 105. A spraying agent is accommodated in the space portion formed between the roller body and the shaft 105. One or more bag-shaped blocking members 111 each having a closed space portion are disposed in the space portion S between the roller body and the shaft 105, and the spraying agent is accommodated in the space portions of the blocking members 111, respectively. Bearings 107 and sealing members 109 are disposed on both sides of the blocking members 111 in the axial direction. The shaft 105 is surrounded with the bag-shaped blocking members 111. The blocking members 111 are provided to form generally cylindrical closed space portions, and accordingly, the shaft 105 is inserted into the space between the blocking members 111. The shaft 105 is inserted into the insides of the blocking members 111 in the radial directions of the blocking members 111, so that the blocking members 111 and the shaft 105 come into contact with each other at the insides of the blocking members 111 to allow the blocking members 111 to be fixed to the shaft 105. A gap is formed between the outer peripheral surfaces of the blocking members 111 in the radial direction and the inner peripheral surface of the roller body part 101 in the radial direction, so that when the conveyor roller operates, no friction between the blocking members 111 and the roller body part 101 occurs.

Otherwise, the outer peripheral surfaces of the blocking members 111 in the radial direction may come into contact with the inner peripheral surface of the roller body part 101 in the radial direction, and a gap is formed between the inner peripheral surfaces of the blocking members 111 in the radial direction and the shaft 105, so that when the conveyor roller operates, the blocking members 111 rotate to the unitary body with the roller body part 101. Accordingly, the spraying agent accommodated in each blocking member 111 may be mixed.

The bag-shaped blocking members 111 each having the closed space portion are disposed in the space portion S between the roller body and the shaft 105, and the spraying agent is accommodated in the space portions of the blocking members ill, respectively. In the structure, discharge holes may be formed on the roller body part 101 toward the axial direction, and otherwise, it may be formed on cap members 103. A reference numeral '103a' in FIG.5 denotes the discharge holes, which are formed on the cap members 103 in such a manner as to be formed inwardly toward the radial direction to allow the spraying agent to be discharged toward the shaft 105.

Reflection members 128 are disposed to face the discharge holes 103a, and they have conically circular plates, while being disposed on the shaft 105 in such a manner as to insert the shaft 105 thereinto. Each reflection member 128 becomes slantly close to the roller body as its diameter is increased, and desirably, it has a size capable of facing the discharge holes 103a. When the spraying agent is discharged from the discharge holes 103a through the breakage of the blocking members 111, it comes into contact with the reflection members 128 to allow the motion direction thereof to be changed into the axial direction toward the inside as well as the radial direction toward the inside.

Even if not shown in FIG.5, the needle members as shown in FIGS. 2 to 4 are disposed on the roller body part 101 or the cap member 103 in such a manner as to be extended toward the blocking members 111. Even if not shown in FIG. 5, the discharge holes 103a may be formed on the shaft 105 in such a manner as to allow the spaces in which the blocking members 111 are located to communicate with the outside.

According to the present invention, as shown in FIGS.2 to 4, the conveyor roller further includes a nozzle member 127 connected to the discharge hole 105a in such a manner as to communicate with the hollow portion of the shaft 105. The nozzle member 127 is disposed on the discharge hole 105a formed on the shaft 105 and the discharge hole formed on the roller body. The nozzle member 127 is a hollow pipe open on both ends thereof so that one side end portion thereof is inserted into the discharge hole. As mentioned above, if one side end portion of the shaft 105 is formed with the second closing part 120, the end portion of the nozzle member 127 is inserted into the through hole of the second fastening screw 125. Accordingly, the spraying agent accommodated in the hollow portion of the shaft 105 is guided through the nozzle member 127 and discharged to the outside. The nozzle member 127 is coupled to the shaft 105 by means of screw-fastening or welding.

As shown in FIG.2, the nozzle member 127 is bent to guide the discharged spraying agent. The nozzle member 127 includes a first extension portion 127a having a portion inserted into the shaft 105 and the remaining portion extended outwardly in the axial direction in such a manner as to be exposed from the end portion of the shaft 105 and a second extension portion 127b slanted outwardly in the radial direction and inwardly in the axial direction. The slanted angle Θ of the second extension portion 127b in the axial direction is 70°. The end portion of the second extension portion 127b is located more inside than the outer periphery of the roller body part 101 in the radial direction, and the second extension portion 127b is slanted so that the extension line thereof is located more outside than the end portion of the outer periphery of the roller body part 101 in the axial direction. Accordingly, the spraying agent discharged through the second extension portion 127b is sprayed to the top of the roller body part 101 .

The nozzle member 127 may have a plurality of second extension portions 127b branched from the first extension portion 127a in such a manner as to be arranged at a given angle in a circumferential direction to discharge the spraying agent at various angles. Otherwise, a plurality of discharge holes is provided in such a manner as to be connected to the nozzle members 127.

The needle member 124 is extended inwardly in the axial direction toward the inside of the third closing member 121. The end portion of the needle member 124 is spaced apart from the blocking member 111. Instead of the needle member 124, the end portion of the nozzle member 127 in the axial direction toward the inside may be sharply formed, and further, the nozzle member 127 may be passed through the third closing member 121 in the axial direction toward the inside in such a manner as to be extended toward the blocking member 111.

According to the present invention, whistle means (not shown) is further provided on the discharge hole so as to generate a sound caused by gas flow. If the nozzle member 127 is connected to the discharge hole, the whistle means may be provided on the nozzle member 127.

The spraying agent is formed of an extinguishing agent so that when sprayed, it extinguishes a fire. Further, the spraying agent contains fluorescent substances or dyes, and for example, the fluorescent substances include zinc silicate, cadmium silicate, and calcium halo-phosphate. The spraying agent is obtained by mixing the extinguishing agent and the fluorescent substances. Since the spraying agent is mixed with the dyes or fluorescent substances, it can be visually sensed when sprayed. Natural or synthetic dyes may be used as the dyes. The dyes are contained in the form of solid powder.

The extinguishing agent includes an extinguishing agent in which sodium hydroxide 2NaHCC>3 and sulfuric acid H2SO4 are mixed, an extinguishing agent in which potassium carbonate K2C03 and sulfuric acid H2S04 are mixed, an extinguishing agent in which sodium carbonate 6NaHC04 and aluminum sulfate octadecahydrate A12(S04)3 18H20 are mixed, and an extinguishing agent like halon-1301, halon-1211, halon-2402, halon-104 and so on.

According to the present invention, as shown in FIG.3, the conveyor roller 100 having the spray function further includes a pressure accumulation member 113 disposed in the hollow portion of the shaft 105 in such a manner as to be expanded according to temperature increments. If the spraying agent is provided in the space portion S formed between the roller body and the shaft 105, as shown in FIG.5, the pressure accumulation member 113, which is not shown in the figure, is disposed in the space portion S formed between the roller body and the shaft 105.

The pressure accumulation member 113 is located at a given position so that while being expanded, it pressures the spraying agent toward the discharge hole. The blocking member 111 has the shape of the bag, and if the spraying agent is accommodated in the blocking member 111, the pressure accumulation member 113 is located at the opposite side to the discharge hole. The blocking member 111 is located between the pressure accumulation member 113 and the discharge hole.

The pressure accumulation member 113 includes a support member 1131 open toward the discharge hole and a moving member 1133 slidable in the axial direction inside the support member 1131. A reference numeral ''1137' in FIG.3 denotes a sealing member disposed between the inner peripheral surface of the support member 1131 and the inner peripheral surface of the moving member 1133, and a reference numeral ''1135' denotes a fastening screw fastened to the support member 1131 at the opposite side to the moving member 1133. Expansion gas is filled in the space formed between the support member 1131 and the moving member 1133. For example, the expansion gas is nitrogen gas.

When the conveyor roller 100 having the spray function according to the present invention is mounted and rotated, it is not rotated anymore if any trouble like the damages of the bearings 107 happens, and accordingly, frictional heat between the conveyor roller 100 and the conveyor belt is generated to cause a fire, so that if a temperature in the accommodation portion in which the spraying agent is accommodated is raised, the volume is accordingly increased to expand the blocking member 111. If the pressure accumulation member 113 is provided, the expansion gas filled in the space formed between the support member 1131 and the moving member 1133 is also expanded to allow the moving member 1133 to slide to the end portion of the support member 1131, thereby pressurizing the spraying agent.

If the blocking member 111 is broken due to the expansion, the spraying agent is discharged through the discharge hole. If the reflection member 128 is provided, the spraying agent discharged through the discharge hole collides against the reflection member 128 so that the motion direction thereof is changed into the axial direction toward the inside. If the nozzle member 127 is provided, the spraying agent is guided through the nozzle member 127 and discharged to the outside so that it leaks from the end of the second extension portion 127b and sprays to the top of the conveyor roller 100 having the spray function. If the plurality of branched second extension portions 127b is provided or if the plurality of nozzle members 127 is provided, the spraying agent is discharged to different directions .

If the blocking member ill is formed of the release valve, the release valve is open through the pressure increment so that the spraying agent is discharged to the outside .

If the spraying agent is formed of the extinguishing agent, the extinguishing agent is sprayed at an initial step of a fire so as to extinguish the fire, and if the spraying agent contains the fluorescent substances or dyes, it can be visually identified. If the needle member 124 is provided, the expanded blocking member 111 comes into contact with the needle member 124 and is thus broken. On the other hand, if the whistle means is provided on the discharge hole or the nozzle member 127, alarming on the fire can be provided through the sound generated from the whistle means, [industrial Applicability]

According to the present invention, the conveyor roller having the spray function has the following effects: firstly, the spraying agent is sprayed upon overheating or fire occurrence; secondly, the spraying agent is formed of the extinguishing agent so that when sprayed, the fire is extinguished to prevent the overheating and achieve the initial fire extinguishment; and thirdly, even if the conveyor roller is installed at a hard-to-access place, the conveyor roller can perform self fire extinguishment. According to the present invention, further the conveyor roller having the spray function has the following effects: the spraying agent is mixed with the fluorescent substances, so that when sprayed, it can be visually sensed; and audible sensing is provided by means of the breakage sound of the blocking member or the sound of the whistle means.

Claims

[claims] [Claim l] A conveyor roller having a spray function, comprising: a hollow roller body having a discharge hole communicating with the outside; a shaft inserted into the roller body; bearings disposed between the roller body and the shaft to rotatably support the roller body against the shaft; a spraying agent disposed in a space portion formed between the roller body and the shaft; and a blocking member adapted to prevent the spraying agent from being discharged to the outside through the discharge hole, wherein if the blocking function of the blocking member is lost, the spraying agent leaks to the outside through the discharge hole. [Claim
2] The conveyor roller according to claim 1, wherein the discharge hole formed on the roller body is formed on the shaft. [Claim
3] The conveyor roller according to claim 1, wherein the blocking member has a shape of a bag located in the space portion formed between the roller body and the shaft, and the spraying agent is accommodated in the bag-shaped blocking member . [Claim
4] The conveyor roller according to claim 1, wherein the blocking member has a shape of a film for blocking the discharge hole, and the spraying agent is accommodated in the space portion formed between the roller body and the shaft and blocked by means of the blocking member from the outside. [Claim
5] The conveyor roller according to claim 1, wherein the shaft comprises a reflection member disposed at the outside of the discharge hole in an axial direction thereof in such a manner as to be extended therefrom in a radial direction, so that the spraying agent discharged from the discharge hole collides against the reflection member to permit the motion direction thereof to be changed into the axial direction toward the inside. [Claim
6] The conveyor roller according to claim 1, wherein the blocking member is a release valve for blocking the discharge hole, and the spraying agent is accommodated in the space portion formed between the roller body and the shaft and blocked by means of the blocking member from the outside. [Claim
7] The conveyor roller according to claim 1, wherein the discharge hole is connected to a nozzle member having a shape of a pipe, and if the blocking function of the blocking member is lost, the spraying agent is guided by the nozzle member and discharged to the outside. [Claim
8] A conveyor roller having a spray function, comprising: a hollow roller body; a shaft inserted into the roller body and having a hollow portion and a discharge hole adapted to allow the hollow portion to communicate with the outside; bearings disposed between the roller body and the shaft to rotatably support the roller body against the shaft; a spraying agent accommodated in the hollow portion of the shaft; and a blocking member adapted to prevent the spraying agent from being discharged to the outside through the discharge hole, wherein if the blocking function of the blocking member is lost, the spraying agent leaks to the outside through the discharge hole. [Claim
9] The conveyor roller according to claim 8, wherein the blocking member has a shape of a bag located in the hollow portion of the shaft, and the spraying agent is accommodated in the bag-shaped blocking member. [Claim
10] The conveyor roller according to claim 8, wherein the blocking member has a shape of a film for blocking the discharge hole, and the spraying agent is accommodated in the hollow portion blocked by means of the blocking member from the outside. [Claim ll] The conveyor roller according to claim 8, wherein the blocking member is a release valve disposed on the discharge hole to block the discharge hole, and the spraying agent is accommodated in the hollow portion blocked by means of the blocking member from the outside. [Claim 12] The conveyor roller according to claim 8, wherein the shaft comprises a needle member having a sharp end portion disposed therein in such a manner as to be extended toward the blocking member . [Claim 13] The conveyor roller according to claim 8, wherein the discharge hole is connected to a nozzle member having a shape of a pipe, and if the blocking function of the blocking member is lost, the spraying agent is guided by the nozzle member and discharged to the outside. [Claim 14] The conveyor roller according to claim 8, wherein the shaft comprises a reflection member disposed in the axial direction toward the outside from the discharge hole in such a manner as to be extended from the shaft in a radial direction, so that if the blocking function of the blocking member is lost, the spraying agent discharged from the discharge hole collides against the reflection member to permit the motion direction thereof to be changed into the axial direction toward the inside. [Claim 15] The conveyor roller according to claim 1, wherein the spraying agent is formed by mixing any one or more of an extinguishing agent, dye, and fluorescent substance. [Claim 16] The conveyor roller according to claim 8, wherein the spraying agent is formed by mixing any one or more of an extinguishing agent, dye, and fluorescent substance. [Claim 17] The conveyor roller according to claim 1, wherein the discharge hole comprises whistle means provided thereon. [Claim 18] The conveyor roller according to claim 8, wherein the discharge hole comprises whistle means provided thereon.