JP6853933B2 - Coating equipment - Google Patents

Description

The present invention relates to a coating device for coating, mixing, drying and the like of powders and granules of pharmaceuticals, foods, pesticides and the like, and particularly to a coating device provided with a rotating drum that is rotationally driven around an axis.

Rotate around the axis to apply film coating, sugar coating, etc. to tablets, soft capsules, pellets, granules, and similar substances (hereinafter collectively referred to as powders and granules) such as pharmaceuticals, foods, and pesticides. A coating device including a driven ventilated rotating drum is used (eg, Patent Documents 1 and 2).

In the process of coating powder or granular material particles using this type of coating device, the rotation speed of the rotating drum, the conditions for adding the spray liquid (membrane agent liquid), and the conditions for adding the spray liquid (membrane agent liquid), based on past operation data and operator experience, etc. In many cases, operating factors such as air supply / exhaust conditions are set and fine-tuned according to the situation. Due to changes in the climate, variations in raw material quality, and fluctuation factors such as operator skills and changes, the desired quality is achieved. The product may not be obtained with sufficient reproducibility. Therefore, from the viewpoint of process validation, a part of the powder or granular material particles is sampled during the processing process, the finished state and physical property values of the sampled powder or granular material particles are grasped, and the control of the operating factor and the coating end point are controlled. It is used for prediction, analysis of processing processes, and the like.

Patent Document 1 discloses an automatic sampling device for sampling a part of powder or granular material particles from the inside of a rotating drum during a processing process in this type of coating device. In this automatic sampling device, a sampling tube is inserted into the rotating drum through the opening at the front end of the rotating drum, and a negative pressure suction force is applied to the sampling tube to obtain powder from the powder or granular material layer inside the rotating drum. A part of the granular material is sucked through a sampling tube and sampled.

Japanese Patent No. 5826593 Japanese Unexamined Patent Publication No. 2014-147923

Since the automatic sampling device of Patent Document 1 has a configuration in which the powder or granular material particles of the powder or granular material layer are sucked and sampled by a negative pressure suction force, the powder sucked by the negative pressure may be set depending on the setting of the negative pressure suction force. The granular material particles may come into strong contact with the inner wall of the sampling tube or the like, causing damage such as cracking, chipping, or abrasion of the granular material particles. Further, in this type of coating device, the nozzle arm of the spray nozzle, the spray liquid pipe, or the like is often inserted into the rotating drum from the front end opening of the rotating drum. However, in the automatic sampling device of Patent Document 1, the automatic sampling device of Patent Document 1 is used. Since the sample collection pipe is inserted from the front end opening of the rotating drum, there is a restriction on the installation position of the sample collection pipe in relation to the installation position of the nozzle arm, the spray liquid pipe, and the like. In particular, in a small machine, the area of the front end opening is small, which may make it difficult to install the sampling tube. Further, especially in a small device, it may be necessary to collect from the sprayed area at the time of sampling, and in this case, it is necessary to stop the spraying and collect the sample. Stopping the spray during coating can affect the quality of the coating finish.

An object of the present invention is to reduce the load on the powder or granular material particles at the time of sampling to prevent or suppress damage to the powder or granular material particles.

Another object of the present invention is to relax the restrictions on the installation of the sampling unit.

Another object of the present invention is to take a sample without stopping the spray.

In order to solve the above problems, in the present invention, a rotating drum in which powder or granular material to be processed is housed and rotationally driven around the axis thereof, and a part of powder from the powder or granular material layer inside the rotating drum. In a coating device provided with a sampling unit for collecting particle particles, the sampling unit is installed on a wall portion of the rotating drum, and a predetermined amount is provided from the powder or granular material layer as the rotating drum rotates in a predetermined direction. A particle guide for collecting the powder or granular material particles of the above, and a particle guide for guiding the powder or granular material particles flowing out from the particle collection unit as the rotating drum rotates in the predetermined direction and discharging the powder or granular material particles to the outside of the rotating drum. Provided is a coating apparatus characterized by comprising a portion.

In the above configuration, the particle collecting unit has an accommodating portion having a collection port capable of accommodating the predetermined amount of powder or granular material particles and allowing the powder or granular material particles to pass through, and the accommodating portion of the rotating drum. The wall portion is provided with an advancing / retreating driving unit for advancing / retreating in the internal / external direction of the rotating drum, and the accommodating unit opens the sampling port at an advancing position in the internal direction of the rotating drum and of the rotating drum. When the collection port is closed at the retracted position in the external direction and the powder or granular material particles are sampled, the advancing / retreating driving unit causes the accommodating unit to move to the powder / granular material layer as the rotating drum rotates in the predetermined direction. When it reaches a predetermined position before reaching it, the accommodating portion is advanced and moved to the advancing position, and the accommodating portion moves while passing through the powder or granular material layer as the rotating drum rotates in the predetermined direction. , The predetermined amount of the powder or granular material particles can be accommodated from the powder or granular material layer through the collection port.

In the above configuration, the advancing / retreating driving unit receives the accommodating unit when the accommodating unit passes through the powder or granular material layer and comes to a second predetermined position as the rotating drum rotates in the predetermined direction. When the accommodating portion comes to a third predetermined position on the front side in the rotation direction from the second predetermined position as the rotating drum is rotated backward in the predetermined direction. The accommodating portion is advanced and moved to the advancing position, and the powder or granular material particles accommodated in the accommodating portion move from the third predetermined position to the front side in the rotational direction as the rotating drum rotates in the predetermined direction. When moving to, the particle guide may be configured to flow out of the collection port due to gravity and be transferred to the particle guide.

In the above configuration, the accommodating portion includes one end wall portion located on the inner side of the rotating drum, the other end wall portion located on the outer side of the rotating drum, and the one end wall portion and the other end wall portion. It is possible to provide a side wall portion located between them and having the sampling port, and slidably penetrate the wall portion of the rotating drum.

In the above configuration, it is preferable that the one end wall portion is flush with the inner surface of the wall portion of the rotating drum when the accommodating portion is retracted to the retracted position.

In the above configuration, it is preferable that at least the peripheral portion of the one end wall portion is formed of a flexible material.

Further, in the above configuration, the advancing / retreating driving unit maintains the accommodating portion in the advancing position even after the accommodating portion passes through the powder or granular material layer as the rotating drum rotates in the predetermined direction. When the accommodating portion moves forward in the rotational direction as the rotating drum rotates in the predetermined direction, the powder or granular material particles accommodating in the accommodating portion flow out from the collection port due to gravity. It can be configured to be transferred to the particle guide unit.

In the above configuration, the accommodating portion includes one end wall portion located on the inner side of the rotating drum, the other end wall portion located on the outer side of the rotating drum, and the one end wall portion and the other end wall portion. The one end wall portion is fixedly supported by the wall portion at a position separated from the inner surface of the wall portion of the rotating drum by a predetermined distance, and is provided between the side wall portions having the sampling port. The portion is composed of the wall portion of the rotating drum, the side wall portion slidably penetrates the wall portion of the rotating drum, and the advancing / retreating driving portion moves the side wall portion in the internal / external direction of the rotating drum. It can be configured to be.

In the above configuration, the rotating drum includes a front end wall portion, a peripheral wall portion connected to the front end wall portion, and a rear end wall portion connected to the peripheral wall portion along the axial direction of the front end wall portion. A front end opening is provided at the front end, and the sampling portion is installed on the front end wall portion, and the particles are obtained from the powder or granular material particles flowing out from the particle collection portion as the rotating drum rotates in the predetermined direction. It can be configured to discharge from the guide portion to the outside of the rotating drum via the front end opening.

According to the present invention, it is possible to reduce the load on the powder or granular material particles at the time of sampling to prevent or suppress damage to the powder or granular material particles.

Further, according to the present invention, restrictions on the installation of the sampling unit can be relaxed.

Further, according to the present invention, sampling can be performed without stopping the spraying.

Further, in the conventional technology, there are pipes and the like, and it is necessary to disassemble and clean and reassemble at the time of cleaning. However, according to the present invention, there is no such part, and CIP cleaning is possible without disassembling at the time of cleaning. ..

It is a vertical sectional view of the coating apparatus which concerns on embodiment of this invention. A cross-sectional view showing the particle collecting part of the sampling part {FIG. 2 (a)}, a perspective view showing a state in which the accommodating part of the particle collecting part is retracted to the retracted position {Fig. 2 (b)}, and the accommodating part of the particle collecting part It is a perspective view {FIG. 2 (c)} which shows the state which advanced to the advance position. FIG. 3 (a)} is a diagram schematically showing a state in which the front end wall portion of the rotating drum is viewed from the inside side of the rotating drum, and FIG. 3 (b)} is an enlarged view of the periphery of the sampling portion. FIG. 4 (a)} is a diagram schematically showing a state in which the front end wall portion of the rotating drum is viewed from the inside side of the rotating drum, and FIG. 4 (b)} is an enlarged view of the periphery of the sampling portion. FIG. 5 (a)} is a diagram schematically showing a state in which the front end wall portion of the rotary drum is viewed from the inside side of the rotary drum, and FIG. 5 (b)} is an enlarged view of the periphery of the sampling portion. FIG. 6 (a)} is a diagram schematically showing a state in which the front end wall portion of the rotating drum is viewed from the inside side of the rotating drum, and FIG. 6 (b)} is an enlarged view of the periphery of the sampling portion. FIG. 7 (a)} is a diagram schematically showing a state in which the front end wall portion of the rotating drum is viewed from the inside side of the rotating drum, and FIG. 7 (b)} is an enlarged view of the periphery of the sampling portion. FIG. 8 (a)} is a diagram schematically showing a state in which the front end wall portion of the rotating drum is viewed from the inside side of the rotating drum, and FIG. 8 (b)} is an enlarged view of the periphery of the sampling portion. FIG. 9 (a)} is a diagram schematically showing a state in which the front end wall portion of the rotary drum is viewed from the inside side of the rotary drum, and FIG. 9 (b)} is an enlarged view of the periphery of the sampling portion. A cross-sectional view {FIG. 10 (a)} showing another embodiment of the particle sampling section of the sampling section, a perspective view {FIG. 10 (b)} showing a state in which the accommodating section of the particle sampling section is retracted to the retracted position, and particle sampling. It is a perspective view {FIG. 10 (c)} which shows the state which the accommodating part of the part has advanced to the advance position.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the coating apparatus according to this embodiment includes a ventilation type rotating drum 1 that is rotationally driven around an axis X that is parallel to or substantially parallel to the horizontal line. The rotary drum 1 is rotatably housed inside the casing 2 and is rotationally driven by a rotary drive mechanism 3 arranged on the rear end side. Further, inside the rotating drum 1, a spray nozzle unit 4 having one or a plurality of spray nozzles 4a for spraying a spray liquid such as a film material liquid toward the powder or granular material layer S is arranged.

In this embodiment, the rotating drum 1 includes a front end wall portion 1a, a peripheral wall portion 1b connected to the front end wall portion 1a, and a rear end wall portion 1c connected to the peripheral wall portion 1b along the axis X direction. A front end opening 1a1 is provided at the front end of the portion 1a, and a rear end opening 1c1 is provided at the rear end of the rear end wall portion 1c. In the example shown in the figure, the front end opening 1a1 is composed of a conical tapered mouse ring whose diameter is gradually increased toward the front. Ventilation to the inside of the rotary drum 1 is performed through the front end opening 1a1 and / or the rear end opening 1c1. The gas ventilated inside the rotary drum 1 passes through the powder or granular material layer (rolling bed of the powder or granular material) S formed inside the rotary drum 1, and then passes through the ventilated portion provided on the peripheral wall portion 1b. It is exhausted to the outside of the rotating drum 1 through the drum 1. Further, in this embodiment, a sampling unit 5 including a particle collecting unit 5A and a particle guiding unit 5B is provided on the front end wall portion 1a of the rotating drum 1.

FIG. 2 shows the particle sampling unit 5A of the sampling unit 5. The particle collecting unit 5A has an accommodating unit 5b having a collection port 5a capable of accommodating a predetermined amount of powder or granular material particles and allowing the powder or granular material particles to pass through, and the accommodating unit 5b, and the front end wall portion 1a of the rotating drum. On the other hand, the rotating drum 1 is provided with an advancing / retreating driving unit 5c for advancing / retreating in the internal / external direction.

In this embodiment, the accommodating portion 5b includes one end wall portion 5d located on the inner side of the rotating drum 1, the other end wall portion 5e located on the outer side of the rotating drum 1, one end wall portion 5d, and the other end wall portion. It is located between 5e and has a side wall portion 5f having a sampling port 5a, and slidably penetrates the front end wall portion 1a of the rotary drum 1. In the example shown in the figure, the outer peripheral surface of the side wall portion 5f of the accommodating portion 5b is in sliding contact with the inner peripheral surface of the sliding ring 5g fixed to the through hole of the front end wall portion 1a, and the entire accommodating portion 5b is a rotating drum. It is configured to slide in the inner and outer directions of 1. Further, one end wall portion 5d is formed of a flexible material such as silicon rubber or silicon resin, and is coupled to a piston 5k of an advance / retreat drive portion 5c described later via a center bolt 5h and a collar 5i.

In this embodiment, the advance / retreat drive unit 5c is composed of a linear actuator, for example, a fluid pressure cylinder, particularly a pneumatic cylinder. Specifically, the advance / retreat drive unit 5c is configured with the cylinder 5j and the piston 5k as main elements. The cylinder 5j includes a first cylinder member 5j1 fixed to the end surface of the sliding ring 5g, and a second cylinder member 5j2 connected to the end surface of the first cylinder member 5j1 with bolts or the like. The piston 5k has a small diameter portion 5k1 on the front end side and a large diameter portion 5k2 on the rear end side, the small diameter portion 5k1 is in sliding contact with the inner peripheral surface of the first cylinder member 5j1, and the large diameter portion 5k2 is a second cylinder member. It is in sliding contact with the inner peripheral surface of 5j2. Between the outer peripheral surface of the small diameter portion 5k1 and the inner peripheral surface of the first cylinder member 5ji, and between the outer peripheral surface of the large diameter portion 5k2 and the inner peripheral surface of the second cylinder member 5j2, O-rings 5l and 5m, respectively. Be sealed. Further, the first cylinder member 5j1 is provided with an air pipe 5n and an air passage 5p for applying compressed air pressure on the tip surface side of the large diameter portion 5k2 of the piston 5k, and the second cylinder member 5j2 is provided with a piston. An air pipe 5q and an air passage 5r for applying compressed air pressure are provided on the rear end surface side of the large diameter portion 5k2 of 5k.

As shown in FIGS. 2A and 2C, compressed air is supplied to the inside of the second cylinder member 5j2 via the air pipe 5q and the air passage 5r of the second cylinder member 5j2, and the large diameter portion of the piston 5k. When compressed air pressure is applied to the rear end surface side of 5k2, the piston 5k advances in the internal direction of the rotating drum 1. As a result, the accommodating portion 5b coupled to the piston 5k advances and moves to the advancing position in the internal direction of the rotating drum 1 with respect to the front end wall portion 1a. When the accommodating portion 5b reaches the advance position, the collection port 5a opens, and the powder or granular material particles of the powder or granular material layer S are accommodated in the accommodating portion 5b via the collection port 5a, and the powder particles contained in the accommodating portion 5b. The body particles can be discharged from the accommodating portion 5b through the collection port 5a. On the other hand, compressed air is supplied to the inside of the first cylinder member 5j1 and the second cylinder member 5j2 via the air pipe 5n and the air passage 5p of the first cylinder member 5j1, and the side of the tip surface of the large diameter portion 5k2 of the piston 5k. When compressed air pressure is applied to the piston 5k, the piston 5k retreats in the outward direction of the rotating drum 1. As a result, the accommodating portion 5b coupled to the piston 5k moves backward to the retracted position in the outward direction of the rotating drum 1 with respect to the front end wall portion 1a. As shown in FIG. 2B, when the accommodating portion 5b reaches the retracted position, the collection port 5a closes and one end wall portion 5d becomes flush with the inner surface of the front end wall portion 1a. Therefore, the powder or granular material particles of the powder or granular material layer S cannot flow into the accommodating portion 5b, and the powder or granular material particles accommodated in the accommodating portion 5b are held by the accommodating portion 5b. Further, since one end wall portion 5d of the accommodating portion 5b is made of a flexible material, it is possible to prevent the powder or granular material particles from being caught when the accommodating portion 5b retreats from the advancing position to the retreating position.

3 to 9 schematically show a state in which the front end wall portion 1a of the rotary drum 1 is viewed from the inside side of the rotary drum 1. The angles shown in FIGS. 3 to 9 (a) are set around the axis X along the rotation direction R of the rotary drum 1 with the position vertically above the axis X of the rotary drum 1 as 0 °. This is the angle taken. The rotation direction R is a direction in which the rotary drum 1 is rotationally driven during processing of the powder or granular material.

As shown in FIGS. 3 to 9, in this embodiment, the particle guide portion 5B of the sampling portion 5 is composed of a plate-shaped member and extends from the rear end to the front end of the front end wall portion 1a, and the extending direction thereof is , The rotating drum 1 is inclined in a predetermined direction with respect to the circumferential direction. Further, in the particle guide portion 5B, the front side of the rotation direction R is a closed wall surface, and the rear side of the rotation direction R receives the powder or granular material particles flowing out from the collection port 5a of the accommodating portion 5b, and the front end opening of the rotary drum 1 is opened. It is a guide passage 5s that guides to 1a1. The extending direction (inclination direction) of the particle guide portion 5B is the powder particles of the powder or granular material layer S that come into contact with the wall surface on the front side in the rotation direction of the particle guide portion 5B when the rotating drum 1 rotates in the rotation direction R. The direction in which the body particles are guided toward the inside of the rotating drum 1 along the wall surface. Further, in the extending direction (inclination direction) of the particle guide portion 5B, when the rotating drum 1 rotates in the direction opposite to the rotation direction R, the powder or granular material comes into contact with the guide passage 5s on the front side in the rotation direction of the particle guide portion 5B. The direction in which the powder or granular material particles of the layer S are guided along the guide passage 5s toward the front end opening 1a1 of the rotating drum 1. Therefore, by rotating the rotary drum 1 in the direction opposite to the rotation direction R, the particle guide portion 5B can also be used as a discharge member for discharging the powder or granular material product after the coating treatment to the outside of the rotary drum 1. Hereinafter, the sampling operation of the powder or granular material particles by the sampling unit 5 will be described with reference to FIGS. 3 to 9.

Referring to FIG. 3, as the rotary drum 1 rotates in the rotation direction R, the powder or granular material layer S inside the rotary drum 1 is lifted to the front side in the rotation direction and has an upward gradient toward the front side in the rotation direction. It becomes a tilted state. As shown in the figure, when the particle collecting part 5A of the sampling part 5 is located on the rear side in the rotational direction with respect to the powder or granular material layer S, the accommodating part 5b of the particle collecting part 5A is in the retracted position, and one end wall portion thereof. It is retracted until 5d is flush with the inner surface of the front end wall portion 1a. The coating treatment of the powder or granular material is performed while rotating the rotary drum 1 in the rotation direction R in this state.

As shown in FIG. 4, as the rotating drum 1 rotates in the rotation direction R, the sampling unit 5 moves from the position shown in FIG. 3 to the front side in the rotation direction, and the accommodating unit 5b of the particle collection unit 5A becomes powder particles. When it reaches the predetermined position P1 before reaching the body layer S, the advancing / retreating driving unit 5c operates, and the accommodating unit 5b advances and moves to the advancing position in the internal direction of the rotating drum 1. When the accommodating portion 5b reaches the advance position, the collection port 5a opens. As shown in the figure, the collection port 5a is preferably formed at a position where the collection port 5a faces the front side in the rotation direction R. The predetermined position P1 in which the advancing / retreating drive unit 5c operates is located on the rear side in the rotational direction from the position immediately before the accommodating unit 5b reaches the powder or granular material layer S or the position immediately before the accommodating unit 5b reaches the powder or granular material layer S. The position. In the example shown in FIG. 4, the predetermined position P1 is a position of about 150 °.

As shown in FIG. 5, when the sampling unit 5 moves from the position shown in FIG. 4 to the front side in the rotation direction as the rotating drum 1 rotates in the rotation direction R, the accommodating portion 5b of the particle collection unit 5A becomes a powder or granular material. By entering (sneaking in) the inside of the surface layer portion of the layer S, the powder or granular material particles inside the powder or granular material layer S flow into the storage portion 5 from the collection port 5a of the storage portion 5 and are collected. Then, as shown in FIG. 6, as the rotating drum 1 rotates in the rotation direction R, a predetermined amount of powder or granular material particles are accommodated in the accommodating portion 5b while the accommodating portion 5b passes through the powder or granular material layer S. Will be done.

As shown in FIG. 7, as the rotating drum 1 rotates in the rotation direction R, the sampling unit 5 moves from the position shown in FIG. 6 to the front side in the rotation direction, and the accommodating unit 5b of the particle collection unit 5A becomes powder particles. When it comes to the predetermined position P2 that has passed through the body layer S, the advancing / retreating driving unit 5c operates, and the accommodating unit 5b moves backward to the retreating position in the outward direction of the rotating drum 1. When the accommodating portion 5b reaches the retracted position, the collection port 5a is closed, and a predetermined amount of powder or granular material particles accommodating in the accommodating portion 5b is held in the accommodating portion 5b. The predetermined position P2 in which the advancing / retreating drive unit 5c operates is the position immediately after the accommodating unit 5b has passed through the powder or granular material layer S, or the position immediately before the accommodating unit 5b has passed through the powder or granular material layer S in the rotational direction. The position on the side. In the example shown in FIG. 7, the predetermined position P2 is a position of about 280 °.

As shown in FIG. 8, as the rotating drum 1 rotates in the rotation direction R, the sampling unit 5 moves from the position shown in FIG. 7 to the front side in the rotation direction, and the accommodating unit 5b of the particle collection unit 5A moves to the front side in the rotation direction. When it comes to the predetermined position P3 on the front side in the rotation direction from the predetermined position P2, the advance / retreat drive unit 5c operates, and the accommodating unit 5b advances and moves to the advance position in the internal direction of the rotating drum 1. As a result, the collection port 5a of the accommodating portion 5b is opened, and the predetermined amount of powder or granular material particles accommodated in the accommodating portion 5b is moved from the predetermined position P3 by the accommodating portion 5b as the rotating drum 1 rotates in the rotation direction R. When moving to the front side in the rotation direction, it flows out from the collection port 5a due to gravity and is transferred to the guide passage 5s of the particle guide portion 5B. Then, it is guided by the guide passage 5s of the particle guide portion 5B by gravity and discharged from the front end opening 1a1 of the rotating drum 1. At the predetermined position P3 in which the advancing / retreating driving unit 5c operates, the powder / granular material particles contained in the accommodating unit 5b can flow out from the collection port 5a due to gravity, and the powder / granular material particles flowing out from the accommodating unit 5b are the particle guide unit 5B. The setting is made in consideration of the condition that the particles are transferred (delivered) to the guide passage 5s. Specifically, the predetermined position P3 is determined in consideration of the form of the accommodating portion 5b and the particle guide portion 5B, the positional relationship between the accommodating portion 5b and the particle guide portion 5B, the rotation speed of the rotating drum 1, and the like. In the example shown in FIG. 8, the predetermined position P3 is a position of about 30 °.

FIG. 9 shows the position P4 (total amount discharge position) of the storage part 5b where the predetermined amount of powder or granular material particles housed in the storage part 5b is completely discharged. A place where the sampling unit 5 is accommodated in the accommodating portion 5b while the sampling unit 5 moves forward from the predetermined position P3 shown in FIG. 8 to the front side in the rotational direction and reaches the total amount discharge position P4 as the rotating drum 1 rotates in the rotational direction R. A certain amount of powder or granular material particles flow out from the collection port 5a, are transferred to the guide passage 5s of the particle guide portion 5B, are guided by the guide passage 5s, and are discharged to the outside of the rotary drum 1 from the front end opening 1a. In this way, the predetermined amount of powder or granular material particles discharged to the outside of the rotary drum 1 is housed in an appropriate container via the product discharge port 6 shown in FIG.

The above sampling operation is performed during the coating process. The coating treatment is usually performed on the powder or granular material particles on the surface layer of the powder or granular material layer S that are inclined with a constant upward gradient toward the front side in the rotation direction as the rotary drum 1 rotates in the rotation direction R. It is performed by spraying a spray solution such as a film agent solution. The powder or granular material particles on the surface layer of the powder or granular material layer S that have been sprayed with the spray liquid flow downward along the surface layer of the powder or granular material layer S due to the influence of gravity or the like, and then the powder or granular material. It returns to the inside of the layer S and is stirred and mixed with other powder or granular material particles inside the powder or granular material layer S. Due to the movement of the powder or granular material particles in the powder or granular material layer and the spraying of the spray liquid, the spray liquid mist adhering to the particle surface is uniformly spread on the particle surface and dried to form a coating film on the particle surface. Will be done. In the sampling unit 5 of this embodiment, as the rotating drum 1 rotates in the rotation direction R, the accommodating portion 5b of the particle collecting unit 5A enters (sneaks into) the inside of the powder or granular material layer S, and the powder or granular material layer Since a predetermined amount of powder or granular material particles are collected from the inside of S, the load on the powder or granular material particles is less than that of the conventional negative pressure suction type sampling device, and the powder or granular material particles are less likely to be damaged during sampling. .. Further, the powder or granular material particles in the surface layer portion of the powder or granular material layer S immediately after receiving the spray liquid from the spray nozzle 4a are in an excessively wet state, and when the powder or granular material particles in the surface layer portion are collected, correct sampling evaluation is performed. Can't do. Therefore, when collecting the powder or granular material particles from the surface layer portion of the powder or granular material layer S, it is necessary to stop the spraying of the spray liquid and mix and stir the powder or granular material layer S for sampling. On the other hand, the powder or granular material particles inside the powder or granular material layer S are agitated and mixed with other powder or granular material particles inside the powder or granular material layer S, and the spray liquid mist is spread on the particle surface. .. In the sampling unit 5 of this embodiment, the accommodating unit 5b of the particle collecting unit 5A enters (sneaks into) the inside of the powder or granular material layer S, and collects a predetermined amount of powder or granular material particles from the inside of the powder or granular material layer S. Therefore, correct sampling evaluation can be performed even if sampling is performed without stopping the spraying of the spray liquid.

FIG. 10 shows another embodiment of the particle sampling unit 5A of the sampling unit 5. The members and parts substantially the same as the particle collecting unit 5A of the embodiment shown in FIG. 2 are designated by the same reference numerals, and redundant description will be omitted.

The main difference between the particle collecting unit 5A of this embodiment and the particle collecting unit 5A shown in FIG. 2 is that the front end wall portion 5d is separated from the inner surface of the front end wall portion 1a of the rotating drum 1 by a predetermined distance. 1a is fixedly supported, the other end wall portion 5e is composed of a part of the front end wall portion 1a, the side wall portion 5f slidably penetrates the front end wall portion 1a, and the advancing / retreating drive portion 5c is a side wall portion. This is a point at which 5f is moved back and forth in the internal and external directions of the rotating drum 1.

A part of the front end wall portion 1a constituting the other end wall portion 5e is fixed to the inner peripheral surface of the sliding ring 5g so as to form a C-ring-shaped sliding slit. The circumferential width of the connection portion between a part of the front end wall portion 1a (the other end wall portion 5e) and the sliding ring 5g corresponds to the circumferential width of the sampling port 5a. The side wall portion 5f slidably penetrates the C-ring-shaped sliding slit. Further, the side wall portion 5f is coupled to the end face plate 5t, and is coupled to the piston 5k of the advancing / retreating drive portion 5c by the coupling bolt 5u via the end face plate 5t.

As shown in FIGS. 10A and 10C, when the piston 5k of the advancing / retreating drive unit 5c advances in the internal direction of the rotary drum 1, the side wall portion 5f coupled to the piston 5k via the end face plate 5t becomes a rotary drum. Advance and move to the advance position in the internal direction of 1. As a result, the side wall portion 5f abuts on one end wall portion 5d or is close to one end wall portion 5d to form an accommodating portion 5b having one end wall portion 5d, the side wall portion 5f, and the other end wall portion 5e. At the same time, the collection port 5a opens. On the other hand, when the piston 5k of the advancing / retreating drive unit 5c retreats in the outward direction of the rotating drum 1, the side wall portion 5f retreats to the retreating position in the outward direction of the rotating drum 1 and the sampling port 5a closes.

When the particle collecting unit 5A of this embodiment is used, the side wall portion 5f is advanced to the advanced position in the internal direction of the rotating drum 1 at the predetermined position P1 shown in FIG. 4, and then reaches the total discharge position P4 shown in FIG. , Maintain that state. Therefore, since the collection port 5a of the storage unit 5b is in a state of being opened from the predetermined position P1 to the total amount discharge position P4, the powder or granular material particles stored in the storage unit 5b flow out from the collection port 5a in the middle stage and rotate. The size, shape, and the like of the collection port 5a are set so as not to return to the inside of the drum 1.

1 Rotating drum 1a Front end wall part 1b Peripheral wall part 1c Rear end wall part 1a1 Front end opening 5 Sampling part 5A Particle collection part 5B Particle guide part 5a Collection port 5b Storage part 5c Advance / retreat drive part 5d One end wall part 5e End end wall part 5f Side wall S powder or granular material layer

Claims (8)

It is provided with a rotating drum in which the powder or granular material to be processed is housed and rotationally driven around the axis thereof, and a sampling unit for collecting a part of the powder or granular material particles from the powder or granular material layer inside the rotating drum. In the coating equipment
The sampling unit is installed on the wall portion of the rotating drum, and a particle collecting unit that collects a predetermined amount of powder or granular material particles from the powder or granular material layer as the rotating drum rotates in a predetermined direction, and the rotating drum. The particle guide portion is provided to guide the powder or granular material particles flowing out from the particle collection portion and discharge the particles to the outside of the rotating drum as the particles rotate in the predetermined direction .
The particle collecting unit has an accommodating portion having a collection port capable of accommodating the predetermined amount of powder or granular material particles and allowing the powder or granular material particles to pass through, and the accommodating portion with respect to the wall portion of the rotating drum. The rotating drum is provided with an advancing / retreating drive unit that moves the rotary drum forward / backward in the internal / external direction, and the accommodating unit opens the sampling port at an advancing position in the internal direction of the rotating drum and moves the rotating drum in the external direction. When the collection port is closed at the retracted position and the powder or granular material particles are sampled, the advancing / retreating driving unit is subjected to the rotation of the rotating drum in the predetermined direction, and the accommodating unit is determined before reaching the powder or granular material layer. When the position is reached, the accommodating portion is advanced and moved to the advancing position, and the accommodating portion advances the powder particles while passing through the powder or granular material layer as the rotating drum rotates in the predetermined direction. A coating device for accommodating a predetermined amount of powder or granular material particles from a body layer through the collection port. The advancing / retreating driving unit moves the accommodating portion to the retreating position when the accommodating portion passes through the powder / particle layer and reaches a second predetermined position as the rotating drum rotates in the predetermined direction. The accommodating portion is moved backward, and when the accommodating portion comes to a third predetermined position on the front side in the rotational direction with respect to the rotation of the rotating drum in the predetermined direction, the accommodating portion is moved. When the accommodating portion is moved to the advancing position and is accommodated in the accommodating portion, the accommodating portion moves forward from the third predetermined position in the rotational direction as the rotating drum rotates in the predetermined direction. The coating device according to claim 1 , wherein the particles flow out from the collection port due to gravity and are transferred to the particle guide portion. The accommodating portion is located between one end wall portion located on the inner side of the rotating drum, the other end wall portion located on the outer side of the rotating drum, and the one end wall portion and the other end wall portion. The coating device according to claim 1 or 2 , further comprising a side wall portion having the sampling port, and slidably penetrating the wall portion of the rotating drum. The coating device according to claim 3 , wherein the one end wall portion becomes flush with the inner surface of the wall portion of the rotating drum when the accommodating portion retracts to the retracted position. The coating device according to claim 3 or 4 , wherein at least the peripheral edge portion of the one end wall portion is formed of a flexible material. The advancing / retreating driving unit maintains the accommodating portion in the advancing position even after the accommodating portion passes through the powder or granular material layer as the rotating drum rotates in the predetermined direction, and accommodates the accommodating portion in the accommodating portion. When the accommodating portion moves forward in the rotational direction as the rotating drum rotates in the predetermined direction, the resulting powder or granular material particles flow out of the collection port due to gravity and are transferred to the particle guide portion. The coating apparatus according to claim 1 , wherein the coating apparatus is made. The accommodating portion is located between one end wall portion located on the inner side of the rotating drum, the other end wall portion located on the outer side of the rotating drum, and the one end wall portion and the other end wall portion. The one end wall portion is fixedly supported by the wall portion at a position separated from the inner surface of the wall portion of the rotating drum by a predetermined distance, and the other end wall portion is the rotating. It is characterized by being composed of a wall portion of a drum, the side wall portion slidably penetrating the wall portion of the rotating drum, and the advancing / retreating driving portion moving the side wall portion in the internal / external direction of the rotating drum. The coating apparatus according to claim 6. The rotating drum includes a front end wall portion, a peripheral wall portion connected to the front end wall portion, and a rear end wall portion connected to the peripheral wall portion along the axial direction, and a front end opening is provided at the front end of the front end wall portion. A portion is provided, and the sampling portion is installed on the front end wall portion, and the powder or granular material particles flowing out from the particle collection portion as the rotating drum rotates in the predetermined direction are transferred from the particle guide portion to the front end. The coating apparatus according to any one of claims 1 to 7 , wherein the coating device is discharged to the outside of the rotating drum through an opening.

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