JP2023146187A - Powder resin coating device and powder resin coating method - Google Patents

Abstract

To grasp a state in a tank, thereby take appropriate measures according to the state in the tank, and maintain the quality of the product.SOLUTION: A powder resin coating device includes a tank which has an air chamber between a bottom plate and a porous plate of at least one layer and stores a powder resin above the porous plate, and air supply means for supplying air to the air chamber, and further includes inner pressure measurement means for measuring the inner pressure of the air chamber, and control means for determining the state in the tank on the basis of an air flow rate supplied to the air chamber and the measurement value of the inner pressure measurement means, and outputting a signal corresponding to a determination result.SELECTED DRAWING: Figure 2

Description

The present invention relates to a powder resin coating apparatus and a powder resin coating method.

BACKGROUND ART Conventionally, as a method for forming a coating film of powdered resin on a workpiece, a fluidized dipping method using a powdered resin coating apparatus is known (see, for example, Patent Document 1). In the fluidized dipping method, a preheated workpiece is immersed in a powder fluidized tank in which powdered resin flows, and the heat welds the powdered resin onto the surface of the workpiece to form a coating film.

A powder fluidization tank that stores powder resin has a porous plate spaced apart from a bottom plate. An air chamber to which air is supplied is formed between the bottom plate and the porous plate. The powder resin coating device vibrates the powder fluidization tank using a vibration mechanism, and also causes the powder resin in the tank to flow by jetting air supplied to an air chamber into the tank through a porous plate. As a result, the powder resin coating apparatus reduces the inclination and unevenness of the powder surface in the powder fluidization tank, so that a coating film can be appropriately formed on the workpiece.

Patent No. 6596477

In the process of forming a coating film on a workpiece using a powder resin coating device, the conditions within the powder fluidization tank change as the process progresses. Specifically, by repeatedly dipping the workpiece into the powder fluidization tank, the diameter of the powder increases and the porous plate becomes clogged. This increases the difference in height of the powder surface and makes it difficult for the powder to penetrate into the details of the workpiece, resulting in uneven coating of the workpiece.

In this way, changes in the conditions inside the powder fluidization tank lead to a decline in product quality, so from the perspective of maintaining product quality, it is important to constantly understand the conditions inside the powder fluidization tank and It is desirable to take appropriate measures according to the situation.

However, the conventional technology does not disclose how to grasp the state inside the powder fluidization tank in order to maintain and improve product quality.

The present invention provides a powder resin coating device and a powder resin coating method that can take appropriate measures according to the conditions inside the tank by understanding the conditions inside the tank and maintain the quality of the product. The purpose is to provide

(1) The powder resin coating apparatus according to the present invention includes an air chamber (for example, A tank having a first air chamber 26 (described later) and storing powder resin above the porous plate (for example, a powder fluidization tank 2 described later), and an air supply means for supplying air to the air chamber. (For example, an air supply device 5 to be described later); determines the state inside the tank based on the internal pressure measuring device 6), the air flow rate supplied to the air chamber, and the measured value of the internal pressure measuring means, and outputs a signal for taking action according to the determination result. It further includes a control means (for example, a control device 7 described below).

(2) In the powder coating apparatus according to (1) above, the state in the tank is the bulk density of the powder resin in the tank, and the control means controls the It is preferable to output a signal for adjusting the air flow rate to the air supply means so that the bulk density of the powder resin becomes a desired bulk density.

(3) In the powder resin coating apparatus according to (1) or (2) above, the state inside the tank is a state in which the porous plate is clogged, and the control means, based on the determination result, When it is determined that the state of clogging of the porous plate is a predetermined state, it is preferable to output a signal for notifying information regarding the state of clogging of the porous plate.

(4) In the powder resin coating method according to the present invention, an air chamber (for example, Powder resin coating that supplies air to the air chamber of a tank (e.g., powder fluidization tank 2 described below) that has a first air chamber 26 (described later) and stores powder resin above the porous plate. The method includes: measuring the internal pressure of the air chamber; determining the state inside the tank based on the air flow rate supplied to the air chamber and the measured value of the internal pressure; and taking measures according to the determination result. Output a signal.

(5) In the powder resin coating method according to (4) above, the state in the tank is the bulk density of the powder resin in the tank, and the bulk density of the powder resin is determined according to the determination result. It is preferable to output a signal for adjusting the flow rate of air supplied to the air chamber so that the bulk density becomes a desired bulk density.

(6) In the powder resin coating method according to (4) or (5) above, the condition in the tank is a state in which the porous plate is clogged, and from the determination result, it is determined that the porous plate is clogged. When it is determined that the clogging state is a predetermined state, it is preferable to output a signal for notifying information regarding the clogging state of the porous plate.

According to the powder resin coating apparatus described in (1) above, it is possible to grasp the state inside the tank based on the air flow rate supplied to the air chamber and the measured value of the internal pressure of the air chamber, and be able to take appropriate measures depending on the situation. Therefore, according to this powder resin coating apparatus, a stable coating film can always be formed on the workpiece, and the quality of the product can be maintained.

According to the powder resin coating apparatus described in (2) above, the bulk density of the powder resin in the tank can be determined from the air flow rate supplied to the air chamber and the measured value of the internal pressure of the air chamber, An appropriate air flow rate can be adjusted according to the bulk density. Therefore, according to this powder resin coating apparatus, the bulk density of the powder resin in the tank can always be adjusted to a stable bulk density, and the quality of the product can be effectively maintained.

According to the powder resin coating apparatus described in (3) above, the presence or absence of clogging of the porous plate in the tank can be determined from the air flow rate supplied to the air chamber and the measured value of the internal pressure of the air chamber. When the porous plate is clogged, information regarding the clogging state of the porous plate can be reported to a manager or the like. Therefore, according to this powder resin coating apparatus, it is possible to prevent the quality of the coating film from deteriorating due to clogging of the porous plate, and it is possible to effectively maintain the quality of the product.

According to the powder resin coating method described in (4) above, it is possible to grasp the state inside the tank based on the air flow rate supplied to the air chamber and the measured value of the internal pressure of the air chamber, and be able to take appropriate measures depending on the situation. Therefore, according to this powder resin coating method, a stable coating film can always be formed on the workpiece, and the quality of the product can be maintained.

According to the powder resin coating method described in (5) above, the bulk density of the powder resin in the tank can be determined from the air flow rate supplied to the air chamber and the measured value of the internal pressure of the air chamber, An appropriate air flow rate can be adjusted according to the bulk density. Therefore, according to this powder resin coating method, the bulk density of the powder resin in the tank can always be adjusted to a stable bulk density, and the quality of the product can be effectively maintained.

According to the powder resin coating method described in (6) above, the presence or absence of clogging of the porous plate in the tank is determined from the air flow rate supplied to the air chamber and the measured value of the internal pressure of the air chamber. When the porous plate is clogged, information regarding the clogging state of the porous plate can be reported to a manager or the like. Therefore, according to this powder resin coating method, it is possible to prevent the quality of the coating film from deteriorating due to clogging of the porous plate, and it is possible to effectively maintain the quality of the product.

1 is a partial cross-sectional view showing the configuration of a powder resin coating apparatus to which a powder resin coating method according to an embodiment of the present invention is applied. FIG. 2 is a schematic diagram showing the configuration of a powder fluidization tank of a powder resin coating apparatus. FIG. 2 is a functional block diagram showing functional blocks of a control device. It is a graph which shows the relationship between the air flow rate and internal pressure in the air chamber in a powder fluidization tank, and the bulk density of powder resin. It is a graph which shows the relationship between the air flow rate and internal pressure in the air chamber in a powder fluidization tank, and the air passage pressure of a porous plate. It is a flow chart showing a powder resin coating method.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partial sectional view showing the configuration of a powder resin coating apparatus to which a powder resin coating method according to an embodiment of the present invention is applied. FIG. 2 is a schematic diagram showing the configuration of a powder fluidized tank of a powder resin coating apparatus. This powder resin coating apparatus 1 is used to form a coating film on a workpiece W based on a fluidized dipping method.

The powder resin coating device 1 includes a powder fluidized tank 2 that stores powder resin, a pedestal 3 that supports the powder fluidized tank 2 on an installation surface (not shown), and is connected to the powder fluidized tank 2. Controls the vibration mechanism 4, the air supply device 5 that supplies air into the powder fluidization tank 2, the internal pressure measurement device 6 that measures the internal pressure of the powder fluidization tank 2, the vibration mechanism 4, and the air supply device 5. A control device 7 is provided.

In addition, although the case where the stator which is one component of the electric motor mounted on a vehicle is used as the workpiece W will be described below, the present invention is not limited to this. The workpiece W, which is a stator, is configured by combining a cylindrical stator core W1 and stator coils W2 provided in a plurality of slots formed inside the stator core W1. In the workpiece W shown in FIG. 1, the lower end of the stator coil W2 in the vertical direction is a part W3 coated with powder resin. In the following, a case will be described in which the powder resin coating apparatus 1 is used to form a coating film by immersing the coating area W3 of the workpiece W in powder resin, and the coating area W3 is provided with an insulating coating by the coating film. .

The powder fluidization tank 2 includes a cylindrical body 21 extending in the vertical direction, a disk-shaped bottom plate 22 that closes the bottom of the body 21, and two disk-shaped bottom plates provided inside the body 21. The first partition plate 23 and the second partition plate 24 are provided. The first partition plate 23 is arranged below the second partition plate 24 and above the bottom plate 22 at intervals. The first and second partition plates 23 and 24 are each a porous plate in which numerous holes smaller than the particle size of the powder resin are formed, and each of the first and second partition plates 23 and 24 is removably provided to the body 21.

In the powder fluidization tank 2, a powder storage section 25 in which powder resin is stored is formed inside the body 21. The powder storage section 25 is formed by a space from the second partition plate 24 to the upper edge 21a of the body 21, with the second partition plate 24 serving as the bottom plate. In the powder fluidization tank 2, a first air chamber 26 is formed below the powder storage section 25 by a space defined by a bottom plate 22 and a first partition plate 23. A second air chamber 27 is formed by the space defined by the plate 24. A plurality of air supply pipes 51 are connected to the first air chamber 26 . Note that when the amount of powder resin in the powder storage section 25 decreases due to use, new powder resin is appropriately supplied into the powder storage section 25 via a hopper (not shown).

The pedestal part 3 includes a plurality of columnar fixed frames 31 extending in the vertical direction, a plate-shaped fixed plate 32 extending in the horizontal direction, and a plurality of supports that support the powder flow tank 2 on the fixed plates 32. A member 33 is provided.

The lower ends of the fixed frame 31 in the vertical direction are each fixed to an installation surface (not shown). The fixed plate 32 has a substantially disk shape when viewed from above, and is provided coaxially with the powder fluidization tank 2 . The fixed plate 32 is fixed to the fixed frame 31 by fastening with a plurality of bolts 31b to an upper end 31a provided on the upper side of the fixed frame 31 in the vertical direction.

The support member 33 extends along the vertical direction and is interposed between a leg portion 331 fixed to the bottom surface 22a of the bottom plate 22 of the powder fluidization tank 2 and an upper surface 32a of the leg portion 331 and the fixing plate 32. An elastic member 332. The support member 33 connects the powder flow tank 2 and the upper surface 32a of the fixed plate 32 via the elastic member 332, and elastically supports the powder flow tank 2 with respect to the upper surface 32a of the fixed plate 32. For example, rubber is used for the elastic member 332.

In this way, the powder fluidization tank 2 is connected to the upper surface 32a of the fixed plate 32 via the elastic member 332, so when the powder fluidization tank 2 is vibrated by the vibration mechanism 4, which will be described later, the powder The fluidization tank 2 is capable of swinging so as to be tilted relative to the upper surface 32a of the fixed plate 32.

The vibration mechanism 4 includes a vibration unit 41 as a columnar vibrating body, and a connection mechanism 42 that connects the vibration unit 41 and the bottom surface 22a of the powder fluidization tank 2.

The vibration unit 41 includes a vibration motor 411 having a rotating shaft 411a, and a housing 412 that accommodates the vibration motor 411. The vibration motor 411 rotates the rotating shaft 411a at a frequency according to a control signal from the control device 7. The rotating shaft 411a is connected to the bottom surface 22a of the powder fluidization tank 2 via a connecting mechanism 42 so as to be substantially coaxial with the center axis of the powder fluidization tank 2. An eccentric weight (not shown) is attached to the rotating shaft 411a. Therefore, when the eccentric rotating shaft 411a is rotated by the vibration motor 411, the housing 412 vibrates.

The connection mechanism 42 includes a bracket 421 that holds the housing 412, and a connection shaft member 422 that connects the bracket 421 and the bottom surface 22a of the powder fluidization tank 2. The bracket 421 clamps the housing 412 and holds the housing 412 so as to be positioned lower than the fixed plate 32 in the vertical direction. The connecting shaft member 422 connects the bracket 421 provided below the fixed plate 32 in the vertical direction and the bottom surface 22a of the powder fluidization tank 2 provided above the fixed plate 32 in the vertical direction.

The vibration mechanism 4 receives a drive signal from the control device 7, rotates the rotating shaft 411a of the vibration motor 411 to vibrate the housing 412, and transmits the vibration to the powder fluidization tank 2 via the coupling mechanism 42. let Thereby, the vibration mechanism 4 swings the powder flow tank 2 and causes the powder resin in the powder storage section 25 to flow.

The air supply device 5 is an air supply means and includes an air compressor (not shown) as an air supply source. The air supply device 5 receives a drive signal from the control device 7 to drive the air compressor, and supplies air adjusted to an air flow rate according to the drive signal to the first air chamber through a plurality of air supply pipes 51. Supply within 26 days. The air supplied into the first air chamber 26 passes through the first partition plate 23 made of a porous plate, flows into the second air chamber 27, and further passes through the second partition plate 24 made of a porous plate. and flows into the powder storage section 25. The air flowing into the powder storage section 25 causes the powder resin in the powder storage section 25 to flow in conjunction with the vibration of the powder fluidization tank 2 by the vibration mechanism 4. Furthermore, by allowing air to flow into the powder storage section 25 from the first air chamber 26, the bulk density of the powder resin within the powder storage section 25 is adjusted according to the air flow rate. In this embodiment, three air supply pipes 51 are connected to the first air chamber 26, but the number of air supply pipes 51 is not limited to three.

The internal pressure measuring device 6 is an internal pressure measuring means and includes a pressure detecting section (not shown) such as a pressure sensor for measuring the internal pressure of the first air chamber 26 . As shown in FIG. 2, one pressure measuring tube 61 is connected to the first air chamber 26. One end inside the pressure measuring tube 61 communicates with the inside of the first air chamber 26 , and the other end communicates with a pressure detecting section of the internal pressure measuring device 6 . The internal pressure measuring device 6 measures the internal pressure of the first air chamber 26 through the pressure measuring pipe 61 when air is being supplied into the first air chamber 26 from the air supply device 5, and calculates the measured value Pv. Output to the control device 7.

The control device 7 is a control means and controls the operation of the powder resin coating device 1 in an integrated manner. Here, of the various functions of the control device 7, only the functional block portions related to the measurement of the internal pressure of the first air chamber 26 will be described with reference to the functional block diagram shown in FIG. 3. As shown in FIG. 3, the control device 7 includes an internal pressure acquisition section 71, a determination section 72, a calculation section 73, and a notification section 74.

The internal pressure acquisition unit 71 acquires the measured value Pv of the internal pressure of the first air chamber 26 measured by the internal pressure measuring device 6 in a predetermined control cycle.

The determination unit 72 determines whether the powder fluidization tank 2 Determine the state within. Specifically, the state inside the powder fluidization tank 2 refers to the bulk density of the powder resin in the powder storage section 25 and the state of the first and second partition plates 23 and 24 provided in the powder fluidization tank 2. This includes at least one of the following:

In the determination unit 72, an ideal control range of the measured value Pv of the internal pressure with respect to the air flow rate (an ideal control range of the bulk density) for determining the bulk density of the powder resin is set in advance. The determination unit 72 compares the measured value Pv of the internal pressure of the first air chamber 26 with respect to the air flow rate supplied to the first air chamber 26 with a preset control width, thereby determining the internal pressure in the powder storage unit 25. It is determined whether the bulk density of the powder resin is higher than the control range, normal, or lower.

When the bulk density of the powder resin determined by the determining unit 72 deviates from the preset management range (in either a state where the bulk density is higher or lower than the management range), the calculation unit 73 calculates the following: Calculate a new air flow rate to keep the bulk density within the control range. This calculated air flow rate is an air flow rate for making the bulk density a target bulk density (a normal state within a control range).

Here, the relationship between the bulk density of the powder resin, the internal pressure of the first air chamber 26, and the air flow rate will be explained. As shown in the graph of FIG. 4, the internal pressure of the first air chamber 26 increases by increasing the air flow rate, but as the bulk density of the powder resin in the powder storage section 25 increases, The internal pressure of 26 increases. However, the rate of increase in internal pressure remains the same, and when the air flow rate is increased, only the intercept of the graph changes. That is, when the air flow rate increases, the bulk density of the powder resin decreases without changing the internal pressure of the first air chamber 26. Therefore, if it is determined that the bulk density is high because the measured value Pv of the internal pressure at a certain air flow rate exceeds the control range, for example, the bulk density is adjusted to be lower by increasing the air flow rate. be able to. On the other hand, if it is determined that the bulk density is low because the measured value Pv of the internal pressure at a certain air flow rate has decreased below the control range, the bulk density is adjusted in the direction of increasing the air flow rate by decreasing the air flow rate. be able to.

The specific method for calculating the new air flow rate in the calculation unit 73 is not particularly limited. The new air flow rate may be determined using a predetermined calculation formula, or may be determined based on a table or map in which the correlation between the air flow rate, the measured value Pv of the internal pressure, and the bulk density is defined in advance.

The calculation unit 73 generates a new drive signal for driving the air supply device 5 based on the new air flow rate calculated so that the bulk density becomes the target bulk density, and Output to. A new drive signal output from the control device 7 (calculating section 73) at this time is a signal for responding (adjusting the air flow rate) according to the determination result of the determining section 72.

The notification unit 74 notifies external devices and the like. Here, the notification unit 74 notifies an external device or the like when the determination unit 72 determines that at least one of the first and second partition plates 23 and 24 is clogged in a predetermined state. I do.

Here, the clogging determined by the determining section 72 will be explained. The determination unit 72 can determine that at least one of the first and second partition plates 23 and 24 is in a predetermined state of clogging based on the measured value Pv of the internal pressure with respect to the air flow rate. That is, even if the air flow rate supplied into the first air chamber 26 is changed to the new air flow rate calculated by the calculation unit 73, the bulk density of the powder resin does not fall within the control range and returns to a normal state. If not, it is presumed that the air passing pressure is in an abnormal state. Therefore, in this case, the determination unit 72 determines that the clogging state of at least one of the first and second partition plates 23 and 24 is a predetermined state that is not suitable for performing powder resin coating on the workpiece W. It is determined that

Further, as shown in FIG. 5, the relationship between the air flow rate supplied to the first air chamber 26 and the internal pressure of the first air chamber 26 at that time is such that as the air flow rate increases, the internal pressure also increases. The slope of the change in internal pressure relative to the air flow rate is upward. However, if at least one of the first and second partition plates 23 and 24 is clogged, the air passing pressure increases, so the slope of the change in internal pressure with respect to the air flow rate at that time is The slope becomes larger compared to the normal state where the passing pressure is low. Therefore, for example, data regarding the rate of change in internal pressure with respect to the air flow rate in a state where the passing pressure is high as shown in FIG. , when the threshold value is exceeded, it is determined that the state of clogging of at least one of the first and second partition plates 23 and 24 is a predetermined state unsuitable for performing the powder resin coating process. Good too.

When the determination unit 72 determines that at least one of the first and second partition plates 23 and 24 is clogged, the notification unit 74 sends a message to the administrator's mobile terminal, personal computer, or powder resin coating. Information regarding the state of clogging is reported on a monitor screen (not shown) provided in the device 1. Information regarding the state of clogging includes information indicating that at least one of the first and second partition plates 23 and 24 is clogged, and at least one of the first and second partition plates 23 and 24. The information may include at least one of information indicating when to replace the first and second partition plates 23 and 24, and information prompting recovery work for at least one of the first and second partition plates 23 and 24. The notification signal outputted from the control device 7 (notification unit 74) at this time is a signal for responding to the determination result of the determination unit 72 (notification of information regarding the state of clogging).

The control device 7 including each of the functional blocks described above is constituted by an arithmetic processing device such as a CPU (Central Processing Unit). In addition, in order to realize the functions of each functional block, the control device 7 uses an auxiliary storage device such as an HDD (Hard Disk Drive) that stores various control programs such as application software and an OS (Operating System), A main storage device such as a RAM (Random Access Memory) for storing data temporarily required when the processing device executes a program can be provided.

Next, a specific process of powder resin coating by the powder resin coating apparatus 1 according to the present embodiment will be described with reference to the flowchart shown in FIG. 6. The process of powder resin coating is performed by sequentially immersing the respective coating parts W3 of a plurality of workpieces W in the powder resin of the powder fluidization tank 2, but here, the coating part W3 of one workpiece W is Only the process of immersing the powder into the powder resin in the powder fluidization tank 2 will be explained as an example.

After the powder resin coating apparatus 1 starts operating, the control device 7 drives the vibration mechanism 4 and the air supply device 5 to swing the powder fluidized tank 2 and close the first air chamber 26 of the powder fluidized tank 2. Supplies air at a predetermined air flow rate. As a result, the powder resin stored in the powder storage section 25 flows. Then, the control device 7 uses the internal pressure acquisition unit 71 to acquire the measured value Pv of the internal pressure of the first air chamber 26 from the internal pressure measuring device 6 at a predetermined control cycle (step S1).

When the internal pressure measurement value Pv is acquired by the internal pressure acquisition unit 71, the control device 7 compares the acquired internal pressure measurement value Pv with a preset management range in the determination unit 72. Thereby, the determination unit 72 determines whether the measured value Pv of the internal pressure for the current predetermined air flow rate is outside the management range, that is, whether the bulk density is outside the management range (step S2). .

As a result of the determination in the determination unit 72, if it is determined that the bulk density is outside the control range (step S2; YES), the control device 7 causes the calculation unit 73 to adjust the bulk density of the powder resin to the target bulk density. A new air flow rate is calculated to achieve the following (step S3).

The control device 7 generates a new drive signal for driving the air supply device 5 in the calculation unit 73 based on the new air flow rate calculated in step S3, and transmits the new drive signal to the air supply device. Output to 5. As a result, the air flow rate supplied from the air supply device 5 to the first air chamber 26 is changed to a new air flow rate (step S4).

After the air flow rate is changed, the control device 7 again acquires the measured value Pv of the internal pressure of the first air chamber 26 by the internal pressure acquisition unit 71 (step S5).

When the internal pressure measurement value Pv is acquired again, the control device 7 uses the determination unit 72 to again compare the acquired internal pressure measurement value Pv with a preset management width. Thereby, the determination unit 72 determines whether the measured value Pv of the internal pressure with respect to the new air flow rate falls within the control range, that is, whether the bulk density falls within the control range (step S6).

In step S6, if it is determined that the bulk density falls within the control range, the control device 7 determines that the powder resin in the powder fluidization tank 2 is in an appropriate state, and controls the coating area W3 of the work W. Immerse in powdered resin. Further, even if it is determined in step S2 that the bulk density is not outside the control range (step S2; NO), the control device 7 determines that the powder resin in the powder fluidization tank 2 is in an appropriate state. Then, the coating portion W3 of the workpiece W is immersed in powdered resin (step S7).

On the other hand, as a result of changing to a new air flow rate, if it is determined in step S6 that the bulk density is not within the control range (step S6; NO), the powder fluidization tank 2 adjusts the air flow rate. It is assumed that at least one of the first and second partition plates 23 and 24 is clogged. Therefore, the control device 7 uses the notification unit 74 to notify information regarding the state of clogging of the first and second partition plates 23 and 24, and issues a warning to the administrator and the like (step S8).

In step S8 described above, when a warning is given to the administrator etc., the powder resin coating apparatus 1 temporarily stops operating. Clogging of the first and second partition plates 23 and 24 occurs when the powder enters the pores of the porous plate due to the vibration of the powder fluidization tank 2 and blocks the pores. Therefore, the administrator or the like who receives the warning removes the first and second partition plates 23 and 24 from the powder fluidization tank 2, respectively, and replaces them with new partition plates or performs recovery work. According to this, the first and second partition plates 23 and 24 can be replaced with new ones before the quality of the product to which powder resin coating is applied deteriorates due to clogging of the first and second partition plates 23 and 24. Alternatively, since recovery work can be performed, the powder resin coating apparatus 1 can maintain product quality.

The recovery work for the first and second partition plates 23 and 24 can be performed, for example, by blowing compressed air onto the surfaces to blow away powder that has entered the pores. Further, the recovery work may be carried out by spraying a high-pressure liquid such as water on the surface, which does not pose a risk of deteriorating the partition plate. Since the powder undergoes a curing reaction even at room temperature, it is preferable to ascertain in advance through experiments or the like the time during which the recovery work can be performed after removing the first and second partition plates 23 and 24. This allows the administrator and the like to effectively carry out recovery work when the first and second partition plates 23 and 24 become clogged.

According to the powder resin coating apparatus 1 according to the present embodiment described above, the following effects are achieved. That is, the powder resin coating apparatus 1 according to the present embodiment has the first air chamber 26 between the bottom plate 22 and the first partition plate 23 of the first and second partition plates 23 and 24 made of porous plates. The powder resin coating apparatus includes a powder fluidization tank 2 that stores powder resin above a first partition plate 23, and an air supply device 5 that supplies air to a first air chamber 26. The internal pressure measuring device 6 measures the internal pressure of the first air chamber 26, and the state inside the powder flow tank 2 is determined based on the air flow rate supplied to the first air chamber 26 and the measured value Pv of the internal pressure measuring device 6. It further includes a control device 7 that makes a determination and outputs a signal for taking action according to the determination result.

According to this, the state inside the powder flow tank 2 can be grasped based on the air flow rate supplied to the first air chamber 26 and the measured value Pv of the internal pressure of the first air chamber 26, and the powder Appropriate measures can be taken depending on the state within the fluidized tank 2. Therefore, according to this powder resin coating apparatus 1, a stable coating film can always be formed on the workpiece W, and the quality of the product can be maintained.

In the powder resin coating apparatus 1 according to the present embodiment, the state in the powder fluidized tank 2 is the bulk density of the powder resin in the powder fluidized tank 2, and the control device 7 controls, according to the determination result, A signal for adjusting the air flow rate is output to the air supply device 5 so that the bulk density of the powder resin becomes a desired bulk density.

According to this, it is possible to grasp the bulk density of the powder resin in the powder flow tank 2 from the air flow rate supplied to the first air chamber 26 and the measured value Pv of the internal pressure of the first air chamber 26, An appropriate air flow rate can be adjusted according to the bulk density. Therefore, according to this powder resin coating apparatus 1, the bulk density of the powder resin in the powder fluidization tank 2 can always be adjusted to a stable bulk density, and the quality of the product can be effectively maintained. can.

In the powder resin coating apparatus 1 according to the present embodiment, the state inside the powder fluidization tank 2 is such that at least one of the first and second partition plates 23 and 24 is clogged, and the control device 7 From the determination result, if it is determined that at least one of the first and second partition plates 23 and 24 is in a predetermined state of clogging, at least one of the first and second partition plates 23 and 24 is clogged. Outputs a signal to notify information regarding the state of clogging.

According to this, based on the air flow rate supplied to the first air chamber 26 and the measured value Pv of the internal pressure of the first air chamber 26, at least one of the first and second partition plates 23 and 24 in the powder flow tank 2 is selected. The presence or absence of clogging can be detected, and if at least one of the first and second partition plates 23, 24 is clogged, the first and second partition plates 23, 24 It is possible to notify an administrator or the like of information regarding clogging of at least one of the above. Therefore, according to this powder resin coating apparatus 1, it is possible to prevent the quality of the coating film from deteriorating due to clogging of at least one of the first and second partition plates 23 and 24, thereby improving the quality of the product. Maintenance can be achieved effectively.

Moreover, according to the powder resin coating method according to the present embodiment, the following effects are achieved. That is, in the powder resin coating method according to the present embodiment, the first air chamber 26 is provided between the bottom plate 22 and the first partition plate 23 of the first and second partition plates 23 and 24 made of porous plates. This powder resin coating method supplies air to the first air chamber 26 of the powder fluidization tank 2 which stores the powder resin above the first partition plate 23, and the internal pressure of the first air chamber 26 is reduced. The state inside the powder fluidization tank 2 is determined based on the measured value Pv of the air flow rate and internal pressure supplied to the first air chamber 26, and a signal for taking action according to the determination result is output.

According to this, the state inside the powder flow tank 2 can be grasped based on the air flow rate supplied to the first air chamber 26 and the measured value Pv of the internal pressure of the first air chamber 26, and the powder Appropriate measures can be taken depending on the state within the fluidized tank 2. Therefore, according to this powder resin coating method, a stable coating film can always be formed on the workpiece W, and the quality of the product can be maintained.

In the powder resin coating method according to the present embodiment, the state in the powder fluidized tank 2 is the bulk density of the powder resin in the powder fluidized tank 2, and the bulk density of the powder resin is determined according to the determination result. A signal is output for adjusting the flow rate of air supplied to the first air chamber 26 so that the air has a desired bulk density.

According to this, it is possible to grasp the bulk density of the powder resin in the powder flow tank 2 from the air flow rate supplied to the first air chamber 26 and the measured value Pv of the internal pressure of the first air chamber 26, An appropriate air flow rate can be adjusted according to the bulk density. Therefore, according to this powder resin coating method, the bulk density of the powder resin in the tank can always be adjusted to a stable bulk density, and the quality of the product can be effectively maintained.

In the powder resin coating method according to the present embodiment, the state inside the powder fluidized tank 2 is such that at least one of the first and second partition plates 23 and 24 is clogged, and from the determination result, it is determined that the first and information regarding the clogging state of at least one of the first and second partition plates 23 and 24 when it is determined that the clogging state of at least one of the second partition plates 23 and 24 is a predetermined state. Outputs a signal to notify.

According to this, based on the air flow rate supplied to the first air chamber 26 and the measured value Pv of the internal pressure of the first air chamber 26, at least one of the first and second partition plates 23 and 24 in the powder flow tank 2 is selected. The presence or absence of clogging can be detected, and if at least one of the first and second partition plates 23, 24 is clogged, the first and second partition plates 23, 24 It is possible to notify an administrator or the like of information regarding the state of clogging of at least one of the above. Therefore, according to this powder resin coating method, it is possible to prevent the quality of the coating film from deteriorating due to clogging of at least one of the first and second partition plates 23 and 24, thereby maintaining the quality of the product. It is possible to aim for emergence.

Although one embodiment of the powder resin coating apparatus and powder resin coating method according to the present invention has been described above, the present invention is not limited thereto. Within the scope of the spirit of the present invention, the detailed configurations of the powder resin coating apparatus and the powder resin coating method may be changed as appropriate.

For example, between step S2 and step S3 of the flowchart shown in FIG. 6, if it is determined that the bulk density is out of the control range, the determination unit 72 sets the measured value Pv of the internal pressure with respect to the air flow rate to a preset threshold value. If the comparison exceeds the threshold value, the state of clogging of at least one of the first and second partition plates 23 and 24 is a predetermined state that is not suitable for performing the powder resin coating process. After making a determination, the process may proceed to step S8 and the administrator or the like may be notified of the determination.

Further, the powder resin coating device and the powder resin coating method according to the present invention are not limited to those that determine both the bulk density and the clogging state of the first and second partition plates 23 and 24; It may be possible to determine only one of them.

1 Powder resin coating equipment 2 Powder fluidization tank 22 Bottom plate 23 First partition plate (porous plate)
24 Second partition plate (porous plate)
26 First air chamber 5 Air supply device (air supply means)
6 Internal pressure measuring device (internal pressure measuring means)
7 Control device (control means)

Claims (6)

a tank having an air chamber between a bottom plate and at least one porous plate and storing powdered resin above the porous plate;
An air supply means for supplying air to the air chamber, the powder resin coating apparatus comprising:
internal pressure measuring means for measuring the internal pressure of the air chamber;
further comprising a control means that determines the state inside the tank based on the air flow rate supplied to the air chamber and the measured value of the internal pressure measuring means, and outputs a signal for taking action according to the determination result, Powder resin coating equipment. The state in the tank is the bulk density of the powder resin in the tank,
The control means outputs a signal for adjusting the air flow rate to the air supply means so that the bulk density of the powder resin becomes a desired bulk density according to the determination result. 1. The powder resin coating device according to 1. The state inside the tank is a state in which the porous plate is clogged,
The control means outputs a signal for notifying information regarding the clogging state of the porous plate when it is determined from the determination result that the clogging state of the porous plate is a predetermined state. The powder resin coating apparatus according to claim 1 or 2. A powder resin coating method for supplying air to the air chamber of a tank that has an air chamber between a bottom plate and at least one porous plate and stores powder resin above the porous plate, the method comprising:
measuring the internal pressure of the air chamber;
A powder resin coating method that determines the state inside the tank based on the air flow rate supplied to the air chamber and the measured value of the internal pressure, and outputs a signal for taking action according to the determination result. The state in the tank is the bulk density of the powder resin in the tank,
The powder according to claim 4, which outputs a signal for adjusting the air flow rate supplied to the air chamber so that the bulk density of the powder resin becomes a desired bulk density, according to the determination result. Resin painting method. The state inside the tank is a state in which the porous plate is clogged,
Claim 4: If it is determined from the determination result that the state of clogging of the porous plate is a predetermined state, a signal for notifying information regarding the state of clogging of the porous plate is output. Or the powder resin coating method described in 5.

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