JP7463735B2 - Can inner coating unit - Google Patents

Description

The present invention relates to a can inner surface painting unit for painting the inner surface of a can that is filled with beverages or other contents.

Conventionally, in cans in which beverages or other contents are filled and sealed, a highly corrosion-resistant synthetic resin coating (coating) is formed on the inside of the can to protect the inside of the can from the contents. A bottle-shaped can with a cap attached to the open end of the can is known as such a can. This bottle-shaped can is formed by forming a bulge or male thread on a small diameter portion formed by reducing the diameter of a cylindrical body having a bottom. As a method for forming a coating on the inside of such a bottle-shaped can, a coating method using a can inner surface coating device described in Patent Documents 1 and 2 is known.

The can inner surface coating device described in Patent Document 1 forms a cylindrical container body (cylinder) from material, applies a first layer of paint with high workability to at least the inner surface near an opening at one end of the container body, and then applies a second layer of paint with high corrosion resistance in a wet-on-wet manner so that at least a portion of the second layer overlaps the first layer, hardens the coating, and the first and second layers cover the entire inner surface of the container.

The can inner surface coating device described in Patent Document 2 forms a coating film on the inner surface of a bottomed cylindrical can body (cylinder) such that at least the part where the mouth will be processed is thicker than the coating film on the inner surface part in the center of the can body, then reduces the diameter of the upper part of the painted can body and processes the mouth at the upper end of the reduced diameter part. This coating film is formed in two steps using three spray guns, and in the first coating step, the first and second spray guns apply paint to the entire area of the inner surface of the cylinder, and in the second coating step, the third spray gun applies paint only to the area of the inner surface of the cylinder that will become the mouth.

JP 2003-191935 A JP 2008-238180 A

However, there is a demand for coating can bodies with a paint different from the paint used in the can inner surface coating apparatus described in Patent Documents 1 and 2. In this case, it is necessary to clean the tank and spray gun that make up the can inner surface coating apparatus, as well as the inside of the piping, before filling the tank with the different paint. This creates the problem that the paint circulating in the can inner surface coating apparatus must be discarded in advance, and cleaning takes a long time.

The present invention was made in consideration of these circumstances, and aims to provide an inner can coating unit that can apply different paints to the inner surface of a can without cleaning the inner can coating device.

The can inner surface painting unit of the present invention is a can inner surface painting unit used in a can inner surface painting device equipped with a spray gun consisting of a valve mechanism and a valve drive mechanism that is detachably attached to the valve mechanism, and includes a tank for storing paint, a pump for pressurizing the paint from the tank through a supply pipe, a unit valve mechanism to which the paint is supplied, and a stand to which the tank and the pump are fixed, and the unit valve mechanism is configured to be detachably attached to the valve drive mechanism of the can inner surface painting device.

In the present invention, the tank and pump are integrated by being fixed to a stand, and by removing the valve mechanism of the can inner surface painting device and attaching the unit valve mechanism to the valve drive mechanism of the can inner surface painting device, the unit valve mechanism can be operated by the valve drive mechanism to apply paint stored in the tank of the can inner surface painting unit to the inside of a can. In other words, simply by attaching the unit valve mechanism to the valve drive mechanism instead of the valve mechanism of the can inner surface painting device, a spray gun can be constructed, and a paint different from the paint of the can inner surface painting device can be applied to the inside of a can without cleaning the can inner surface painting device.

In a preferred embodiment of the can inner surface coating unit of the present invention, the valve drive mechanism is configured with an electromagnetic mechanism that drives the valve of the valve mechanism by electromagnetic force, and the unit valve mechanism includes a supply port through which the paint is supplied, a spray port for spraying the paint, and a valve body that closes the supply port and the spray port, and the valve body has a magnetic body, and the magnetic body is attached to the valve drive device.

In the above embodiment, the magnetic body of the valve body is driven by the electromagnetic mechanism, so there is no need to fix the valve body to a part of the valve drive mechanism. For example, compared to a configuration in which the valve drive mechanism moves the valve body hydraulically, the electromagnetic mechanism can be easily attached and detached from the unit valve mechanism.

In a preferred embodiment of the can inner surface coating unit of the present invention, the stand has casters for moving the stand.
In the above embodiment, the can inner surface coating unit can be easily moved by the casters, improving convenience.

In a preferred embodiment of the can inner surface coating unit of the present invention, the pump is an air pump, the pump is provided with a connection part to which an air pipe can be connected, and the connection part is provided with an air regulator.

In the above embodiment, the pump is driven by air circulated through the air regulator. For example, if high-pressure air piping is installed in a factory where the can inner surface coating device is located, the pressure of the air circulating in this high-pressure air piping can be adjusted by the air regulator, and the pump can be driven by the air after the pressure adjustment. This eliminates the need to provide a pump drive source in the can inner surface coating unit, allowing the can inner surface coating unit to be made smaller.

In a preferred embodiment of the can inner surface coating unit of the present invention, the stand is provided with a regulator that adjusts the pressure of the paint supplied to the unit valve mechanism.

In the above embodiment, paint with adjusted pressure can be supplied to the unit valve mechanism, so paint can be sprayed at approximately the same pressure as that of the can inner surface coating device.

In a preferred embodiment of the can inner surface coating unit of the present invention, the stand is provided with a heater between the pump and the regulator to heat the paint.

In the above embodiment, the paint temperature is appropriately controlled by the heater, and paint at the appropriate temperature is supplied to the unit valve mechanism via the regulator, so that paint at the appropriate temperature can be applied to the inner surface of the can.

In a preferred embodiment of the can inner surface coating unit of the present invention, the stand is provided with a filter between the pump and the regulator to remove impurities from the paint.

In the above embodiment, impurities are removed from the paint using a filter, and high-purity paint is supplied to the unit valve mechanism via the regulator, allowing high-purity paint to be applied to the inner surface of the can.

The present invention allows different paints to be applied to the inside of a can without cleaning the can inside coating equipment.

1 is a schematic diagram of a can inner surface coating unit and a can inner surface coating device according to an embodiment of the present invention. FIG. 2 is a diagram showing an internal configuration of the can inner surface coating unit and the can inner surface coating device shown in FIG. 1 . FIG. 2 is a schematic view showing a side view of the can inner surface coating unit shown in FIG. 1 . FIG. 2 is a schematic view showing the top surface of the can inner surface coating unit shown in FIG. 1 . FIG. 2 is a cross-sectional view of a valve mechanism of the can inner surface coating unit shown in FIG. 1 . 2 is a cross-sectional view of the valve mechanism of the can inner surface coating unit shown in FIG. 1 with a valve drive mechanism (electromagnetic mechanism) attached thereto. FIG. 2 is a diagram showing an internal configuration of a state in which the valve mechanism of the can inner surface coating unit shown in FIG. 1 is attached to an electromagnetic mechanism of a can inner surface coating device. FIG.

The following describes an embodiment of the present invention with reference to the drawings. Since the can inner surface coating unit 20 of this embodiment is a unit used in the can inner surface coating device 10, the can inner surface coating device 10 will be described first.

[Configuration of can inner surface coating device]
1, can inner surface coating apparatus 10 (hereinafter referred to as coating apparatus 10) is an apparatus that coats the inner surface of cans 100 that are supplied from a supply unit 11 and transported in the circumferential direction of a rotary table 12. This coating apparatus 10 has three spray guns 71, 72, 73 that apply paint, and sensors 58 located near each of the three spray guns 71, 72, 73. Each of these sensors 58 is connected to a control unit 59 provided in the main body (not shown) of the coating apparatus 10, and when the sensors 58 detect a can 100 transported by the rotary table 12, they transmit a detection signal for the can 100 to the control unit 59.

Each of the spray guns 71, 72, and 73 is made up of a valve mechanism 61, 62, and 63 for spraying paint, and an electromagnetic mechanism 57 which is a valve drive mechanism. The electromagnetic mechanism 57 is an electromagnetic mechanism that uses a solenoid, and drives the valve bodies of the valve mechanisms 61, 62, and 63 by electromagnetic force. The electromagnetic mechanism 57 is also connected to the control unit 59, as is the sensor 58. When the control unit 59 receives a detection signal from the sensor 58, it controls the electromagnetic mechanism 57 to open the valves of the valve mechanisms 61, 62, and 63. This causes paint to be sprayed from each of the spray guns 71, 72, and 73, and the inner surface of the bottomed cylindrical can 100 is painted.

The coating device 10 has three supply systems 50 each including a spray gun 71, 72, and 73. In the following description, the supply system 50 for the spray gun 71 will be described, but the supply systems 50 for the spray guns 72 and 73 have the same configuration, so description thereof will be omitted.
2, the supply system 50 includes a tank 51 for storing paint, a pump 53 for pressure-feeding the paint from the tank 51 through a supply pipe 52 to a valve mechanism 61, a heater 54 for heating the paint flowing through the supply pipe 52, a filter 55 for removing impurities from the paint heated by the heater 54, a regulator 56 for adjusting the pressure of the paint flowing through the filter 55, and a spray gun 71 consisting of the valve mechanism 61 and an electromagnetic mechanism 57 detachably provided on the valve mechanism 61. Of these, the regulator 56 and the valve mechanism 61 are connected by a hose 521. This hose 521 also serves as the supply pipe 52 and can be freely moved.
With this configuration, in the coating device 10, under the control of the control unit 59, the three spray guns 71, 72, and 73 spray paint onto the inner surface of the can 100 three times.

[Configuration of can inner surface coating unit]
As shown in Fig. 1, the can inner surface coating unit 20 (hereinafter referred to as the coating unit 20) is provided separately from the coating device 10 and has a supply system 30 (see Fig. 2) having a unit valve mechanism 40 for applying paint. The unit valve mechanism 40 has the same shape as the valve mechanisms 61, 62, and 63 of the coating device 10. The unit valve mechanism 40 will be described in detail below, along with each component of the coating unit 20.

2, the supply system 30 of the painting unit 20 includes a tank 31 for storing paint, a pump 33 for pumping paint from the tank 31 through the supply pipe 32 to the unit valve mechanism 40, a heater 34 for heating the paint flowing through the supply pipe 32, a filter 35 for removing impurities from the paint heated by the heater 34, a regulator 36 for adjusting the pressure of the paint flowing through the filter 35, a unit valve mechanism 40 to which the paint is supplied through the regulator 36, and a stand 21 to which the tank 31, part of the supply pipe 32, the pump 33, the heater 34, the filter 35, and the regulator 36 are fixed. In other words, the painting unit 20 includes the tank 31, part of the supply pipe 32, the pump 33, the heater 34, the filter 35, and the regulator 36 integrated by the stand 21, and the regulator 36 and the unit valve mechanism 40 are connected by a hose 321. This hose 321 also serves as the supply pipe 32, but as shown in FIG. 1, it is not fixed to the stand 21 and can be freely moved around.

As shown in Figures 3 and 4, the stand 21 is composed of a rectangular parallelepiped metal box, and casters 22 are provided on the underside of the stand 21 to allow the stand 21 to be moved. This allows the painting unit 20 to be easily moved around the factory.

The tank 31 is, for example, a 18L can, and as shown in FIG. 3, paints available on the market or newly developed paints are placed directly in the stand 21. A pump 33 is connected to the tank 31 via a supply pipe 32. As shown in FIG. 4, the pump 33 is an air pump that is driven by air supplied from a high-pressure air pipe in a factory. As shown in FIG. 3, the pump 33 is provided with a connection part 331 to which a high-pressure air pipe can be connected, and an air regulator 38 is fixed to the connection part 331. As shown in FIG. 3 and FIG. 4, the air regulator 38 is fixed to the stand 21 and adjusts the pressure of the supplied air. Therefore, the pump 33 is supplied with air with adjusted pressure, and the pump 33 is driven by this air.

As shown in FIG. 3, the heater 34 is fixed inside the stand 21 and heats the paint flowing through the supply pipe 32. The heating temperature of the paint is set to, for example, about 40°C. Although the filter 35 is not shown in FIG. 3 and FIG. 4, it is fixed inside the stand 21 and removes impurities from the paint heated by the heater 34. The paint that has flowed through the filter 35 is then supplied to the regulator 36 via the supply pipe 32. As shown in FIG. 3 and FIG. 4, the regulator 36 is fixed to the top surface of the stand 21 and adjusts the pressure of the paint. The paint with the adjusted pressure is then supplied to the unit valve mechanism 40 via the hose 321.

[Spray gun configuration]
7, the spray gun 70 is constructed by extending the hose 321 toward the coating device 10 and attaching the unit valve mechanism 40 to the electromagnetic mechanism 57 of the coating device 10. Of these, the unit valve mechanism 40 has a main body 41 and a needle 45, as shown in FIGS.
The main body 41 is formed in a long cylindrical shape, and inside the main body 41, a flow path 42 consisting of a through hole penetrating the main body 41 in the axial direction is formed. A supply port 43 for supplying paint into the flow path 42 of the main body 41 is formed on the circumferential surface of the main body 41, and a hose 321 is connected to the supply port 43. A spray port 44 for discharging (spraying) the paint supplied from the supply port 43 is formed at the tip of the main body 41. The spray port 44 is located on the tip side of the flow path 42, and is formed in a shape that gradually reduces in diameter toward the tip in order to increase the discharge pressure of the paint. A mounting portion 412 for mounting the unit valve mechanism 40 to the electromagnetic mechanism 57 is formed at the end of the main body 41 opposite to the spray port 44.

The needle 45 is made of a magnetic material formed into a generally cylindrical shape longer than the main body 41. As shown in Figs. 5 and 6, the needle 45 has a tip 451 arranged opposite the spray nozzle 44, an expanded diameter portion 452 extending in the radial direction of the needle 45, and a plunger portion 453 extending from the expanded diameter portion 452 on the opposite side of the tip 451. The tip 451, expanded diameter portion 452, and plunger portion 453 are integrated. Of these, the tip 451 closes the spray nozzle 44, and the expanded diameter portion 452 closes the supply port 43, so that the tip 451 and the expanded diameter portion 452 function as a valve body.

The tip 451 is formed in the same shape as the spray nozzle 44, and specifically, is shaped so that the diameter gradually decreases toward the tip. The expanded diameter portion 452 is set to be approximately the same as the diameter of the flow path 42, as shown in Figures 5 and 6. In addition, the axial length of the expanded diameter portion 452 in the main body 41 is formed to be greater than the axial length of the supply port 43.

The plunger portion 453 is formed in a cylindrical shape. The spring member 46 is inserted into the plunger portion 453, and the tip of the spring member 46 abuts against the enlarged diameter portion 452. Meanwhile, the rear end of the spring member 461 abuts against the screw member 411. The screw member 411 is attached to the main body 41 after the needle 45 is inserted into the flow path 42 of the main body 41 and the spring member 46 is inserted into the plunger portion 453, and then the screw member 411 is fixed. By attaching the screw member 411 to the main body 41, the needle 45 is biased toward the spray nozzle 44 by the spring member 46. Therefore, as shown in FIG. 5, the tip portion 451 fits into the spray nozzle 44 to close the spray nozzle 44, and the outer circumferential surface of the enlarged diameter portion 452 closes the supply port 43.

[Configuration of electromagnetic mechanism]
The electromagnetic mechanism 57 corresponds to the valve drive mechanism of the present invention, and is configured to be detachable from the unit valve mechanism 40. The electromagnetic mechanism 57 is provided with an electromagnetic coil 571, a yoke 572 disposed around the electromagnetic coil 571, and a fixed iron core 573 closing one end side of the yoke 572. The electromagnetic mechanism 57 configures a solenoid with the above-mentioned plunger portion 453 functioning as a movable iron core.
Further, an attachment portion 575 to which the attachment portion 412 of the unit valve mechanism 40 is attached is formed at the end of the yoke 572. When the attachment portion 412 of the main body 41 is attached to this attachment portion 575 to fix the unit valve mechanism 40 to the electromagnetic mechanism 57, a part of the plunger portion 453 is inserted into the space 574 of the electromagnetic coil 571 (yoke 572) with a small gap therebetween, as shown in FIG.

When this electromagnetic mechanism 57 is attached to the unit valve mechanism 40, current flows through the electromagnetic coil 571 under the control of the control unit 59, generating a magnetic flux, magnetizing the fixed iron core 573, and attracting the plunger portion 453 to the fixed iron core 573. As a result, the enlarged diameter portion 452 and the tip portion 451, which are integrated with the plunger portion 453, move along the axial direction of the main body 41 to the side opposite the spray nozzle 44. This opens the supply port 43 and the spray nozzle 44, and paint is supplied into the flow path 42 and ejected from the spray nozzle 44.

[Inner surface painting using can inner surface painting equipment]
1, the inner surface painting process performed by the painting device 10 is divided into three steps and performed using three spray guns 71, 72, and 73. In this case, for example, the paints supplied to the three spray guns 71, 72, and 73 may be the same or different.

[Inner surface painting by can inner surface painting unit]
For example, there may be cases where an experiment is desired to paint the inner surface of the can 100 using a paint different from the paint sprayed from any of the three spray guns 71, 72, 73. In such a case, it is necessary to clean the supply system 50 that supplies paint to the spray guns 71, 72, 73 that spray the different paints, and it is also necessary to dispose of the waste liquid generated by the cleaning. To save such trouble, in this embodiment, the painting unit 20 is used to paint the inner surface of the can 100. This will be described in detail below.

For example, if it is desired to change the paint sprayed from the spray gun 71, as shown in FIG. 7, the valve mechanism 61 of the coating device 10 is removed from the electromagnetic mechanism 57, and then the unit valve mechanism 40 of the coating unit 20 is attached to the electromagnetic mechanism 57 to form the spray gun 70. This unit valve mechanism 40 is attached in the same position as the valve mechanism 61, so that the spray gun 70 is provided in the same position as the spray gun 71.

When the can 100 being transported by the rotating table 12 is detected by a sensor 58 located near the spray gun 70, power is supplied to the electromagnetic mechanism 57 under the control of the control unit 59 based on the detection signal sent from the sensor 58, driving the needle 45 of the unit valve mechanism 40, and the paint stored in the tank 31 of the painting unit 20 is applied to the inner surface of the can 100.

In this embodiment, an example is shown in which the unit valve mechanism 40 of the painting unit 20 is attached to the electromagnetic mechanism 57 instead of the valve mechanism 61 that constitutes the spray gun 71, but the unit valve mechanism 40 can also be attached to the electromagnetic mechanism 57 instead of each of the valve mechanisms 62 and 63. Also, if there are multiple painting units 20, the unit valve mechanism 40 can be attached to the electromagnetic mechanism 57 instead of each of the valve mechanisms 61, 62, and 63.

In this embodiment, the tank 31, part of the supply pipe 32, the pump 33, the heater 34, the filter 35 and the regulator 36 are fixed to the stand 21 to be integrated, and the valve mechanisms 61, 62, and 63 of the coating device 10 are removed, and the unit valve mechanism 40 is attached to the electromagnetic mechanism 57 of the coating device 10, so that the unit valve mechanism 40 can be operated by the electromagnetic mechanism 57 to apply the paint stored in the tank 31 of the coating unit 20 to the inner surface of the can 100. In other words, simply by attaching the unit valve mechanism 40 to the electromagnetic mechanism 57 instead of the valve mechanisms 61, 62, and 63 of the coating device 10, a spray gun 70 can be configured, and a paint different from the paint of the coating device 10 can be applied to the inner surface of the can 100 without cleaning the coating device 10. In addition, since the unit valve mechanism 40 is attached to the electromagnetic mechanism 57, even when the unit valve mechanism 40 is used, the electromagnetic mechanism 57 can be driven to spray the paint when the can 100 is detected. Therefore, the inside surface of the can 100 can be painted using the can inside surface painting unit 20 under substantially the same conditions as the painting device 10.

In this embodiment, the needle 45 made of a magnetic material is driven by the electromagnetic mechanism 57, so there is no need to fix the needle 45 to a part of the electromagnetic mechanism 57. This makes it easier to attach and detach the electromagnetic mechanism 57 from the unit valve mechanism 40 compared to, for example, a configuration in which the valve drive mechanism moves the needle 45 using hydraulic pressure or the like.

In addition, since the pump 33 is an air pump, the pump 33 is driven by air circulating through an air regulator. Therefore, the pressure of the air circulating in the high-pressure air piping installed in the factory where the coating device 10 is installed can be adjusted by the air regulator 38, and the pump 33 can be driven by the air after the pressure adjustment. Therefore, there is no need to provide a drive source for the pump 33 in the coating unit 20, and the coating unit 20 can be made smaller.

In addition, the stand 21 is provided with casters 22, so that the painting unit 20 can be easily moved by the casters 22, thereby improving convenience.
Furthermore, since the regulator 36 is fixed to the stand 21, paint with adjusted pressure can be supplied to the unit valve mechanism 40, and paint can be sprayed at approximately the same pressure as the coating device 10. Also, since the heater 34 for heating the paint is provided between the pump 33 and the regulator 36, the temperature of the paint can be appropriately controlled by the heater 34, and paint at an appropriate temperature is supplied to the unit valve mechanism 40 via the regulator 36, so that paint at an appropriate temperature can be applied to the inner surface of the can 100. In addition, the stand 21 is provided with a filter 35 for removing impurities from the paint between the pump 33 and the regulator 36, and by removing impurities from the paint, paint with high purity is supplied to the unit valve mechanism 40 via the regulator 36, so that paint with high purity can be applied to the inner surface of the can 100.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the tank 31, a portion of the supply piping 32, the pump 33, the heater 34, the filter 35, and the regulator 36 are fixed to the stand 21, but this is not limited thereto, and only the tank 31, a portion of the supply piping 32, and the pump 33 may be fixed thereto.

In the above embodiment, the electromagnetic mechanism 57 is used as the valve drive mechanism for driving the valve body (the tip portion 451 and the expanded diameter portion 452 of the needle 45) of the unit valve mechanism 40, but this is not limited thereto, and for example, a configuration in which the needle 45 can be moved by an electromagnet may be used. Furthermore, the valve body drive mechanism is not limited to an electromagnetic mechanism, and a mechanism for moving the needle 45 by hydraulic pressure or the like may be used.
Although the needle 45 is made of a magnetic material, the present invention is not limited to this and the valve body portion and the magnetic material may be combined. In other words, as long as the plunger portion 453 is made of a magnetic material, the tip portion 451 and the expanded diameter portion 452 do not have to be made of a magnetic material.

In the above embodiment, the stand 21 has casters 22, but this is not limited thereto, and for example, the stand 21 does not need to have casters 22. In this case, the painting unit 20 may be configured to be fixed near the painting device 10. In other words, the painting unit 20 does not need to be movable.

In the above embodiment, the pump 33 is configured as an air pump, but this is not limited and the driving source can be freely selected.

In the above embodiment, three supply systems 50 including three spray guns 71, 72, 73 are provided, but the present invention is not limited to this. For example, two of the three spray guns 71, 72, 73 may have one supply system 50. In this case, the same paint is supplied from one supply system 50 to two valve mechanisms 61, 62 constituting the two spray guns 71, 72. When different paints are supplied from these two spray guns 71, 72, it is common to provide two painting units 20, but for example, two regulators 36 may be provided on the stand 21 of the painting unit 20. In this case, two unit valve mechanisms 40 connected to each of the two regulators 36 via the hoses 321 may be provided. In other words, the painting unit 20 may have two or more unit valve mechanisms 40.

10...Can inner surface coating device (coating device)
11: Supply section 12: Rotary table 20: Can inner surface coating unit (coating unit)
21... Stand 22... Caster 30, 50... Supply system 31, 51... Tank 32, 52... Supply pipe 321, 521... Hose 33, 53... Pump 331... Connection part 34, 54... Heater 35, 55... Filter 36, 56... Regulator 38... Air regulator 40... Unit valve mechanism 41... Main body 411... Screw member 412... Mounting part 42... Flow path 43... Supply port 44... Spray nozzle 45... Needle 451... Tip (valve body)
452...Expanded diameter portion (valve body)
453...plunger portion 46...spring member 57...electromagnetic mechanism (valve drive mechanism)
571... coil 572... yoke 573... fixed core 574... space 575... mounting portion 58... sensors 61, 62, 63... valve mechanism 70, 71, 72, 73... spray gun 100... can

Claims (7)

A can inner surface coating unit for use in a can inner surface coating device, the can inner surface coating unit comprising: a spray gun including a valve mechanism for spraying paint by actuation of a valve body, and a valve drive mechanism detachably provided on the valve mechanism for driving the valve body; a tank for storing the paint; and a pump for pressure-feeding the paint from the tank to the valve mechanism,
The can inner surface coating unit comprises:
A can inner surface coating unit comprising: a unit tank for storing paint; a unit pump for pressure-feeding the paint from the unit tank through a supply piping; a unit valve mechanism to which the paint is supplied by the unit pump and which sprays the paint by operation of a unit valve body; and a stand to which the unit tank and the unit pump are fixed, wherein the unit valve mechanism is detachably attached to the valve drive mechanism of the can inner surface coating device and is operable by the valve drive mechanism. the valve drive mechanism is constituted by an electromagnetic mechanism that drives the valve body of the valve mechanism by electromagnetic force, the unit valve mechanism includes a supply port through which the paint is supplied, a spray port for spraying the paint, and the unit valve body that closes the supply port and the spray port,
2. The can inner surface coating unit according to claim 1, wherein the unit valve body has a magnetic body, and the magnetic body is attached to the valve drive mechanism . The can inner surface coating unit according to claim 1 or 2, characterized in that the stand has casters that allow the stand to be moved. The can inner surface coating unit according to any one of claims 1 to 3, characterized in that the unit pump is composed of an air pump, the unit pump is provided with a connection part connected to an air pipe, and the connection part is provided with an air regulator. The can inner surface coating unit according to any one of claims 1 to 4, characterized in that the stand is provided with a regulator that adjusts the pressure of the paint supplied to the unit valve mechanism. The can inner surface coating unit according to claim 5, characterized in that the stand is provided with a heater between the unit pump and the regulator to heat the paint. The can inner surface coating unit according to claim 5 or 6, characterized in that the stand is provided with a filter between the unit pump and the regulator to remove impurities from the paint.

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