JP5097100B2 - Shooting device - Google Patents

Description

  The present invention relates to a chute device.

In an industrial product production line, various materials are processed. Here, in the case of a material such as powder, it is handled by various transport devices such as a belt conveyor, piping, and chute (see, for example, Patent Documents 1 and 2). Here, when the powder is dropped while sliding, the powder may accumulate in the chute. If the powder accumulates in the chute, the conveyance of the powder may be hindered. Therefore, a technique for preventing powder accumulation by vibrating the chute (see, for example, Patent Document 3) and a technique for preventing powder accumulation by sliding while floating the powder in air (for example, Patent Document). 4-6) have been developed.
JP-A-10-96657 JP-A-7-171484 Japanese Patent Laid-Open No. 10-267552 JP 2000-118655 A JP-A-8-118092 JP-A-7-109018

  When the powder is slid while being floated with a gas, if the momentum of the blown-out gas is weak, the powder may not be retained. On the other hand, if the momentum of the gas blown out is strong, the powder may be scattered around. This invention is made | formed in view of such a problem, and makes it a subject to provide the chute | shoot apparatus which a powder does not accumulate easily and does not fly around.

  In order to solve the above-mentioned problems, the present invention is to form the powder passage with a gas-permeable member in order to blow out gas from the entire wall surface of the powder passage, and set the thickness of the downstream side of the powder passage to the upstream side. Make it thinner than the thickness.

  Specifically, it is a chute device for dropping powder supplied from above to a predetermined position, which is formed by a breathable member, and a powder passage for dropping the powder to the predetermined position, and the powder passage Air supply means for supplying air to the air-permeable member forming the powder passage so that the gas that has permeated the air-permeable member forming the gas blows out from the entire wall surface of the powder passage. The breathable member to be formed has a thickness on the downstream side of the powder passage thinner than a thickness on the upstream side.

  In the chute device, since the powder passage through which the powder falls is formed of a gas permeable member, when the air supply means supplies air to the gas permeable member, the gas blows out from the entire wall surface of the powder passage. Thereby, the powder passing through the powder passage falls while sliding smoothly on the wall surface of the powder passage.

By the way, when the powder flows through a passage such as a pipe line, the passage is closed because the powder accumulates in any part, and the powder flowing later accumulates in this portion. It is because it will obstruct. Therefore, in order to prevent the passage of such a powder passage from being blocked, it is significant to prevent the powder from collecting on the downstream side. Here, in the above chute device, in order to ensure that the gas that prevents the powder from adhering to the wall surface is sufficiently blown out from the wall surface, the thickness of the air-permeable member in the portion concerned is thinner than the others. doing. The pressure loss of the gas that passes through the breathable member varies depending on the thickness of the breathable member. For this reason, in the said chute | shoot apparatus, the blowing amount of the gas which blows off from a wall surface is adjusted with the thickness of a breathable member. Thereby, it is possible to prevent the powder from being collected with a simple configuration and not to be scattered around.

  Here, the thickness of the air-permeable member forming the powder passage is based on the correlation between the thickness of the air-permeable member and the amount of gas that permeates, and the blowout in which powder does not accumulate in the powder passage. You may set so that it may become quantity. Since the pressure loss of the gas that permeates the air-permeable member changes depending on the thickness of the air-permeable member, the thickness of the air-permeable member is set based on these correlations to blow out in the powder passage. The gas blowout amount can be set to an appropriate blowout amount as desired.

  The powder passage is formed of a cylindrical air-permeable member, and at least a part of the inner peripheral wall surface of the powder passage so that the upper side of the powder passage opens larger than the lower side. An inclined surface may be provided. When the upper side of the powder passage is opened larger than the lower side, the powder passing through the powder passage gradually passes through the narrow passage as it goes downstream. In this case, the powder is most easily collected on the downstream side. However, as the amount of gas blown out from the wall surface of the powder passage increases in the portion as described above, in the vicinity of the wide open upper opening. It is possible to prevent the powder from being scattered around and to prevent the powder from collecting in the powder passage.

  Further, the apparatus further includes a housing that accommodates a gas-permeable member that forms the powder passage, and the air supply means includes a space formed between the gas-permeable member that forms the powder passage and the housing. The air may be supplied so that the atmospheric pressure is higher than the atmospheric pressure in the powder passage. Here, the housing may have any shape as long as it can accommodate the air-permeable member, but at least it should not be deformed by the pressure of the gas supplied by the air supply means. . By making the air pressure in the space formed between the housing and the air permeable member higher than the air pressure in the powder passage, an amount of gas corresponding to the thickness of the air permeable member is generated in the powder passage. It comes to blow out.

  It is possible to provide a chute device in which powder does not easily accumulate and does not scatter around.

  Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a configuration diagram of a coating unit 1 that sprays a powder coating material. As shown in FIG. 1, the coating unit 1 is supplied to the coating unit main body 2 by the coating unit main body 2, the compressed air supply units 3 </ b> A and 3 </ b> B, and the compressed air supply unit 3 </ b> B that compress the air and supply the compressed air to the coating unit main body 2. A dehumidifier 4 that dehumidifies air and a coating nozzle 5 that sprays powder coating material supplied from the coating unit main body 2 are configured. The compressed air supply machines 3A and 3B are usually installed in a factory or the like where the present coating unit 1 is installed, and control air for controlling a large number of devices installed in the factory. Is a facility to supply

  FIG. 2 is a view showing the internal structure of the painting unit main body 2. The coating unit main body 2 includes a chute device 6 that receives the powder paint, and an injector device 7 that uses the compressed air supplied from the compressed air supply unit 3A as a drive source and sends the powder paint falling from the chute device 6 to the coating nozzle 5. It is configured.

  The chute device 6 protects the chute member 8 that slides the powder paint introduced from the opening portion that opens upward to the injector device 7, the cylindrical housing 9 that houses the chute member 8, and the upper end of the chute member 8. It is comprised with the annular member 10 to do.

  The chute member 8 is obtained by processing a cylindrical member, and the powder paint slides down in the tube. The chute member 8 is a continuous porous body obtained by sintering a PTFE (polytetrafluoroethylene) plastic powder, and is a member excellent in high heat resistance and chemical resistance. The chute member 8 is a porous body having a pore diameter of 5 to 100 μm and has air permeability. The chute member 8 forms a powder passage 11 through which the powder coating material passes by a through-hole extending in the vertical direction. The inner wall of the chute member 8 that forms the powder passage 11 is formed vertically, so that the inner wall surface of the first inner wall surface 12 that forms the inner wall surface of the cylinder, and the inner surface of the cone by tilting with respect to the vertical direction. The second inner wall surface 13 forms an inclined wall surface. Since the inner wall of the chute member 8 is formed in this way, the powder passage 11 is formed so that the upper side is wide open and the lower side is narrower than the upper side. The outer wall forming the outer peripheral side surface of the chute member 8 is formed like a cylindrical side surface, but is formed so that the diameter is different between the lower side and the upper side, and the lower first outer wall surface 14 is It is formed to have a smaller diameter than the upper second outer wall surface 15. Since the outer wall forming the outer peripheral side surface of the chute member 8 is formed in this manner, a step surface 16 is formed between the lower first outer wall surface 14 and the upper second outer wall surface 15. . The chute member 8 is formed so that the first inner wall surface 12 is located on the back side of the first outer wall surface 14 and the second inner wall surface 13 is located on the back side of the second outer wall surface 15.

  The housing 9 is a cylindrical member and houses the chute member 8. The housing 9 fixes the chute member 8 at a fixed position when the second outer wall surface 15 of the chute member 8 contacts the inner wall surface of the housing 9 in a state where the chute member 8 is accommodated. The housing 9 forms a chamber chamber 18 that is an annular space by separating the inner wall surface and the first outer wall surface 14 of the housing 9 in a state in which the chute member 8 is accommodated. The housing 9 is provided with a connection port 17 for connecting an air hose. The chamber chamber 18 communicates with the connection port 17 and is configured such that air flowing from the connection port 17 is introduced into the chamber chamber 18. Here, the housing | casing 9 is comprised by the member which does not have air permeability like the chute | shoot member 8. FIG. Therefore, the air introduced into the chamber chamber 18 through the connection port 17 passes through the air-permeable chute member 8 and blows out from the first inner wall surface 12 and the second inner wall surface 13 into the powder passage 11. Become. When compressed air is introduced into the chamber chamber 18, the atmospheric pressure becomes higher than that of the powder passage 11 and its surroundings, so that an upward force is applied to the chute member 8 by the atmospheric pressure applied to the step surface 16. Therefore, when the chute member 8 is not fixed at all, the chute member 8 may jump out of the housing 9 due to the introduction of compressed air into the chamber chamber 18, but the chute member 8 is housed in the housing 9. The upper end is fixed by the annular member 10. Therefore, even if compressed air is introduced into the chamber chamber 18, the chute member 8 is not likely to jump out.

  The injector device 7 sends the powder paint falling through the powder passage 11 of the chute device 6 described above to the coating nozzle 5 with compressed air supplied from the compressed air supply machine 3.

  The coating unit 1 can supply the compressed air from the compressed air supply machines 3 </ b> A and 3 </ b> B, and put the powder coating material into the chute device 6, whereby the coating nozzle 5 can spray the coating material.

Here, the chute device 6 of the painting unit 1 will be described in detail. FIG. 3 is a diagram illustrating the flow of air that passes through the chute member 8. When compressed air is introduced into the chamber chamber 18 of the chute device 6, the air pressure passes through the chute member 8 because the air pressure in the chamber chamber 18 becomes higher than the air pressure in the powder passage 11. Incidentally, the lower portion of the chute member 8 forming the powder passage 11 is formed by the first inner wall surface 12 and the first outer wall surface 14 as described above, and the upper portion is the second portion. The inner wall surface 13 and the second outer wall surface 15 are formed. Therefore, the chute member 8 that partitions the chamber chamber 18 and the powder passage 11 has a lower thickness that is thinner than the upper thickness. For this reason, the chute member 8 that transmits the compressed air in the chamber chamber 18 into the powder passage 11 has a low air resistance on the lower side and a high air resistance on the upper side. Therefore, a large amount of air that passes through the chute member 8 from the chamber chamber 18 and flows into the powder passage 11 passes below the powder passage 11, and the amount that passes above the powder passage 11 is smaller than that below. As a result, the momentum of the air blown into the powder passage 11 is strong on the lower side and weak on the upper side.

  FIG. 4 is a view showing the flow of air in the powder passage 11, and FIG. 5 is a graph showing the strength of air blown from the chamber chamber 18 into the powder passage 11. As shown in FIGS. 4 and 5, the chute device 6 blows air vigorously below the powder passage 11 where powder is most likely to be clogged in the powder passage 11, and disperses the powder paint around. The momentum of the air blown out above the easy powder passage 11 is weakened. This is because the thickness of the chute member 8 that partitions the chamber chamber 18 and the powder passage 11 is thin at the lower side of the powder passage 11 close to the injector device 7, and at the upper side of the powder passage 11 that is far from the injector device 8, This is because the chute member 8 that partitions the chamber chamber 18 and the powder passage 11 is thick. Since the first inner wall surface 12 constituting the powder passage 11 has a height of about 300 mm, the first inner wall surface extends from the injector device 7 to about 300 mm as shown in the graph of FIG. The amount of air blown from 12 is substantially constant, and the amount of air blown rapidly decreases in the portion above it. In the graph of FIG. 5, the amount of air blown from the injector device 7 at a portion of 0 mm is defined as 100, and the amount of air blown at each portion is shown. The amount of air blown out from the injector device 7 to about 300 mm is gradually reduced because the connection port 17 is attached to the lower side of the chamber chamber 18, so This is because a lot of compressed air flows. Since the porous body having air permeability is generally proportional to the thickness of the porous body, by adjusting the amount of air blown into the powder passage 11 by the thickness of the porous body, It is possible to adjust to a desired optimum blowing amount. The chute device 6 pays attention to such a characteristic of the porous body, and the powder paint is difficult to accumulate inside, and the powder paint does not scatter around. Further, according to the chute device 6, since the connection port 17 communicates with the lower side of the chamber chamber 18, the dry air from the compressed air supply unit 3 </ b> B and the dehumidifier 4 can be supplied even when the coating is not performed. By flowing into the chamber chamber 18, the powder passage 11 and the injector device 7 can be sufficiently dried and cleaned.

  In the above embodiment, the chute device 6 that slides the powder in the tubular powder passage 11 has been described as an example. However, the present invention is a chute provided with a powder flow path including a pipe having a square cross section. It is also possible to configure as a device or a chute device having a powder flow path in which the powder simply slides down the slope. Moreover, in the said embodiment, what dried the compressed air is blown in the powder channel | path 11, However, It is not limited to such gas. Any gas may be used as long as it does not wet the powder. For example, nitrogen gas or carbon dioxide gas filled in a cylinder without containing moisture can be applied.

The block diagram of a painting unit. The internal structure figure of a painting unit main part. The figure which shows the flow of the air which permeate | transmits a chute | shoot member. The figure which showed the flow of the air in a powder channel | path. The graph which showed the strength of the air which blows off in a powder channel from a chamber room.

Explanation of symbols

1 Coating unit 6 Chute device 8 Chute member 11 Powder passage

Claims (4)

A chute device for dropping powder supplied from above into a predetermined position,
A powder passage formed by a breathable member for dropping the powder to the predetermined position;
An air supply means for supplying air to the air-permeable member forming the powder passage so that the gas that has passed through the air-permeable member forming the powder passage blows out from the entire wall surface of the powder passage;
The breathable member that forms the powder passage has a thickness on the downstream side of the powder passage that is thinner than the thickness on the upstream side,
Shooting device. The thickness of the air-permeable member forming the powder passage is an amount of blow-out in which powder does not accumulate in the powder passage, based on the correlation between the thickness of the air-permeable member and the amount of gas that permeates. Set as
The chute apparatus according to claim 1. The powder passage is formed of a cylindrical air-permeable member, and is inclined to at least a part of the inner peripheral wall surface of the powder passage so that the upper side of the powder passage is opened larger than the lower side. Surface is provided,
The chute apparatus according to claim 1 or 2. A housing that houses a breathable member that forms the powder passage;
The air supply means supplies air so that an air pressure in a space formed between the air-permeable member forming the powder passage and the housing is higher than an air pressure in the powder passage.
The chute apparatus as described in any one of Claim 1 to 3.

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