JP2012047245A - Valve and coating device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve and a coating device using the same, which can quickly and exactly conduct opening/closing operation.SOLUTION: A coating liquid is supplied from a first outlet 16 of the valve 10 to a die 104. The coating liquid is circulated from a second outlet 18 of the valve 10 to a tank 110 of the coating liquid. A first valve element 26 of the first outlet 16 of the valve 10 is opened and closed by a first voice coil motor 30, and a second valve element 28 of the second outlet 18 is opened and closed by the second voice coil motor 32, so that a traveling web W is intermittently coated.

Description

  The present invention relates to a valve and a coating apparatus using the valve.

  Conventionally, an intermittent coating apparatus that intermittently coats a coating liquid on a long web such as a film, fabric, paper, metal foil, or metal mesh has been proposed (for example, see Patent Document 1).

  This conventional intermittent coating apparatus has a valve between a pump for feeding coating liquid and a die in order to alternately form an uncoated section and a coated section by a die on a web transported on a backup roll. When forming an uncoated section, close this valve and stop supplying the coating liquid to the die.On the other hand, when forming a coated section, open this valve and apply the coating to the die. Supply liquid.

JP 2009-95752 A

  However, when applying a coating liquid intermittently to a metal foil used for electrode members of recent lithium ion batteries, the accuracy of the length of the uncoated section and the length of the coated section is better than before. Highly demanded.

  Therefore, when the valve that supplies / stops the coating liquid to the die is driven by an air cylinder as in the past, the delay due to the frictional resistance of the air or air cylinder, etc. is not constant. There is a problem in that the time varies, the length of the coated section and the length of the uncoated section change slightly, and may not be able to meet the above requirements.

  Further, even when the AC servomotor is used to open and close the valve, the response time by the servomotor is slow.

  In view of the above problems, the present invention provides a valve that can be opened and closed quickly and accurately, and a coating apparatus using the same.

  The present invention includes a fluid inlet provided in the valve body, a first outlet of the fluid provided in the valve body, a second outlet of the fluid provided in the valve body, and the first A first valve that opens and closes the outlet of the first valve, a second valve that opens and closes the second outlet, and a first valve body in the first valve that slides relative to the first valve seat A valve comprising: a voice coil motor; and a second voice coil motor that slides a second valve body of the second valve with respect to a second valve seat.

  In the valve of the present invention, by using the voice coil motor, the first outlet and the second outlet can be opened and closed quickly and accurately.

  Further, in the coating apparatus using the valve of the present invention, the length of the coating section and the length of the uncoated section can be accurately formed on the web.

It is a longitudinal cross-sectional view of the valve | bulb which shows one Example of this invention. It is explanatory drawing of the coating apparatus of a present Example.

  A valve 10 according to an embodiment of the present invention and a coating apparatus 100 using the valve 10 will be described.

(1) Structure of Valve 10 First, the structure of the valve 10 will be described with reference to FIG.

  In the valve 10 of this embodiment, an inlet 14 for a coating liquid, which is a fluid, is opened on the side of the valve body 12, and a cylindrical first outlet 16 and a cylindrical second are formed on the upper part of the valve body 12. The outlet 18 is formed and opened side by side. Inside the valve body 12, a space 20 that connects the inlet 14, the first outlet 16, and the second outlet 18 is formed. Inside the space 20, a first valve seat 22 made of rubber or silicon is formed at the base of the first outlet 16, and a second rubber made of rubber is formed at the base of the second outlet 18. The valve seat 24 is formed.

  A first valve body 26 for opening and closing the first valve seat 22 is disposed inside the base portion of the first outlet 16. A second valve body 28 for opening and closing the second valve seat 24 is disposed inside the base of the second outlet 18.

  A first voice coil motor 30 and a second voice coil motor 32 are attached side by side to the lower portion of the valve body 12.

  The first sliding shaft 34 protruding from the upper part of the first voice coil motor 30 penetrates the valve main body 12, and the first valve body 26 is attached to the tip thereof. As the first sliding shaft 34 slides, the first valve body 26 opens and closes the first valve seat 22. A first position sensor 38 is attached to the first sliding shaft 34 protruding from the lower portion of the first voice coil motor 30. The first position sensor 38 is composed of a linear scale, and can detect the position of the first sliding shaft 34 in units of 1 μm.

  The second sliding shaft 36 protruding from the upper part of the second voice coil motor 32 penetrates the valve main body 12, and the second valve body 28 is attached to the tip thereof. As the second sliding shaft 36 slides, the second valve body 28 opens and closes the second valve seat 24. A second position sensor 40 is attached to the second sliding shaft 36 protruding from the lower part of the second voice coil motor 32. The second position sensor 40 is also composed of a linear scale, and can detect the position of the second sliding shaft 36 in units of 1 μm.

(2) Structure and Operating State of First Voice Coil Motor 30 Next, the structure of the first voice coil motor 30 will be described.

  A cylindrical iron outer yoke 42 is disposed inside the cylindrical casing 31, and a ring-shaped magnet 44 is fixed to the inner peripheral surface of the outer yoke 42. A cylindrical iron inner yoke 46 is disposed inside the cylindrical outer yoke 42, and the outer yoke 42 and the inner yoke 46 are fixed on the lower surface.

  A gap is provided between the outer yoke 42 and the inner yoke 46. A cylindrical nonmagnetic coil bobbin 48 is slidably disposed in the gap in the axial direction. A coil 50 is wound around the outer peripheral surface of the coil bobbin 48 and corresponds to the position of the ring-shaped magnet 44.

  A first sliding shaft 34 penetrates and is fixed to the central portion of the coil bobbin 48 in the axial direction.

  The second voice coil motor 32 also has the same structure as the first voice coil motor 30.

(3) Operating State of First Voice Coil Motor 30 The operating state of the first voice coil motor 30 will be described.

  When a direct current is passed through the coil 50 of the first voice coil motor 30, a magnetic field is generated between the ring-shaped magnet 44 and the coil bobbin 48 is connected to the first voice coil motor 30 and the first voice coil motor 30 according to Faraday's law. One sliding shaft 34 moves in the axial direction. The sliding speed that moves in the axial direction is determined by the strength of the direct current flowing through the coil 50. Further, to what position the first sliding shaft 34 protrudes, the position of the first sliding shaft 34 is detected by the first position sensor 38, and the first sliding shaft 34 reaches the predetermined position. If it moves, the direct current which flows into the coil 50 will be turned off, and the sliding of the 1st sliding shaft 34 will be stopped.

  The second voice coil motor 32 also performs the same operation as the first voice coil motor 30.

(3) Configuration of coating apparatus 100 Next, the configuration of the coating apparatus 100 will be described with reference to FIG.

  A long web W (for example, a metal foil), which is a material of an electrode member of a lithium ion battery, travels at a predetermined traveling speed V by a backup roll 102. On the side of the backup roll 102, a die 104 for intermittently applying a coating liquid to the web W is disposed. A liquid reservoir 106 is provided inside the die 104, and reaches from the liquid reservoir 106 through the slit 108 to the discharge port of the die 104.

  A tank 110 for storing the coating liquid is disposed, and a pump 112 that pumps the coating liquid from the tank 110 is provided. The pump 112 is driven by a pump motor 114.

  A pressure feeding pipe 116 for supplying the coating liquid pressure fed from the pump 112 is connected to the inlet 14 of the valve 10 described above.

  One end of a liquid supply pipe 118 is connected to the first outlet 16 of the valve 10, and the other end of the liquid supply pipe 118 is connected to the coating liquid inlet 120 of the die 104.

  One end of a circulation pipe 122 is connected to the second outlet 18 of the valve 10, and the other end of the circulation pipe 122 is provided in the tank 110. A throttle valve 124 is provided in the middle of the circulation pipe 122.

  Before and after the backup roll 102, a guide roll 130 and a guide roll 132 for guiding the web W are rotatably provided.

(4) Electrical configuration of coating apparatus 100 The electrical configuration of the coating apparatus 100 will be described with reference to FIG.

  The control unit 126 formed of a computer includes a travel motor 128 for rotating the backup roll 102, a pump motor 114 for driving the pump 112, the first voice coil motor 30 for the valve 10, and the second voice coil motor 32, respectively. It is connected.

(5) Operation state of coating apparatus 100 Next, the operation | movement which performs the intermittent coating which forms the coating area and the uncoated area on the web W using the coating apparatus 100 is demonstrated.

  When the coating section is formed on the web W, the control unit 126 causes the web W to travel at the traveling speed V, the first outlet 16 of the valve 10 is opened, the second outlet 18 is closed, and the pump The coating liquid is pumped from 112, and the coating liquid is pumped to the die 104 through the valve 10. The coating liquid pumped to the die 104 is applied to the traveling web W at the discharge port through the slit 108 from the liquid reservoir 106. In this case, the operation of the valve 10 is controlled until the first outlet 16 reaches the open state and the second outlet 18 reaches the closed state in order to prevent the starting end of the coating section from rising. To do. The control method is as follows.

  First, the reference sliding speed v0 of the first sliding shaft 34 at the reference running speed V0 of the web W is measured in advance by a coating test so that the start end of the coating section does not rise, and the control unit 126 The measured reference running speed V0 and reference sliding speed v0 are stored.

  Then, when the traveling speed V of the web W is the reference traveling speed V0, the control unit 126 moves the first sliding shaft 34 at the stored reference sliding speed v0 and causes the first outlet 16 to move. An open state is set, the second outlet 18 is closed, and coating of a coating liquid is started on the web W to form a coating section. However, when the traveling speed V changes from the reference traveling speed V0, for example, when the traveling speed V becomes twice the reference traveling speed V0, the control unit 126 uses the first sliding speed v1 as the reference sliding speed. The coating speed is increased to twice the speed v0. In other words, the control unit 126 controls the strength of the direct current flowing through the coil 50 of the first voice coil motor 30 to increase the first sliding speed v1 as the traveling speed V increases, and vice versa. As the traveling speed V decreases, the first sliding speed v1 is also decreased and coating is started. The reason for such control is that when the coating liquid is applied to the web W with the same thickness, the amount of coating liquid discharged from the die 104 per unit time increases as the traveling speed V increases. This is because, in order to increase the coating amount, it is necessary to quickly slide the first sliding shaft 34 and open the first valve body 26 quickly. The sliding stop position when the first sliding shaft 34 is opened is detected by the first position sensor 38, and when the first sliding shaft 34 projects to a predetermined position, the control unit 126 turns off the direct current flowing through the coil 50 of the first voice coil motor 30 to stop the sliding of the first sliding shaft 34. In addition, the control unit 126 controls the strength of the direct current flowing through the coil 50 of the second voice coil motor 32 to close the second outlet 18, so that the second sliding shaft 36 The second sliding speed v2 is performed at the maximum sliding speed v2max. The sliding stop when the second sliding shaft 36 is closed is stopped when the second valve body 28 hits the second valve seat 24. As a result, the discharge amount of the coating liquid is controlled in accordance with the traveling speed V of the web W, and it is possible to prevent the rising of the start end of the coating section and to start coating.

  Next, the control unit 126 measures the length of the coating section of the web W from the traveling speed V, and when the coating section coating is finished, closes the first outlet 16 and simultaneously 2 outlet 18 is opened. The control unit 126 controls the strength of the direct current that flows through the coil 50 of the first voice coil motor 30 to make the first sliding shaft 34 in the closed state. The speed v1 is set at the maximum sliding speed v1max. On the other hand, the control unit 126 controls the intensity of the direct current that flows through the coil 50 of the second voice coil motor 32 to open the second outlet 18 in the same manner. The second sliding speed v2 of 36 is performed at the maximum sliding speed v2max. The reason for this control is that the faster the discharge of the coating liquid is completed, the more the end portion of the coating section becomes an edge and the swell can be prevented, and the discharge of the coating liquid can be performed quickly. This is because it is necessary to close the first valve body 26 by sliding the first sliding shaft 34 earliest in order to end the operation. The sliding stop when the first sliding shaft 34 is closed is stopped when the first valve body 26 hits the first valve seat 22. Further, the sliding stop position when the second sliding shaft 36 is opened is detected by the second position sensor 40, and when the first sliding shaft 34 projects to a predetermined position, The controller 126 turns off the direct current flowing through the coil 50 of the second voice coil motor 32 to stop the sliding of the second sliding shaft 36. As a result, the swell of the end of the coating section can be prevented, and the length of the coating section can be accurately applied to a predetermined length.

  Next, the control unit 126 measures the length of the uncoated section of the web W from the traveling speed V, and when the formation of the uncoated section is completed, the first outlet 16 of the valve 10 is controlled by the same control as described above. Is opened, the second outlet 18 is closed, and the coating section is applied to the web W. When the uncoated section is formed, the first outlet 16 of the valve 10 is in a closed state and the second outlet 18 is in an open state, so that the coating liquid pumped from the pump 112 is It circulates to the tank 110 by the circulation pipe 122. This circulation amount is determined by the throttle valve 124.

(6) Effect According to the present embodiment, the first voice coil motor 30 and the second voice coil motor 32 control the opening / closing states of the first outlet 16 and the second outlet 18 of the valve 10. In this case, the speed control and the position control are performed by the strength of the direct current flowing through the first voice coil motor 30 and the second voice coil motor 32, and the first position sensor 38 and the second position sensor 40. Therefore, the length of the coating section and the length of the uncoated section can be applied accurately. In addition, the swell of the coating liquid at the start end and the end end in the coating section can be prevented.

Example of change

  In the said Example, although the die | dye 104 was used as a coating head of the coating apparatus 100, you may use not only this but the coating head which has another coating head, for example, a lip type coater, or a doctor edge.

  Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 Valve 12 Valve body 14 Inlet 16 1st outlet 18 2nd outlet 26 1st valve body 28 2nd valve body 30 1st voice coil motor 32 2nd voice coil motor 34 1st sliding shaft 36 Second sliding shaft 38 First position sensor 40 Second position sensor 100 Coating device 102 Backup roll 104 Die 110 Tank 112 Pump 126 Control unit

Claims (5)

A fluid inlet provided in the valve body;
A first outlet for the fluid provided in the valve body;
A second outlet for the fluid provided in the valve body;
A first valve that opens and closes the first outlet;
A second valve for opening and closing the second outlet;
A first voice coil motor that slides the first valve body of the first valve relative to the first valve seat;
A second voice coil motor that slides the second valve body of the second valve relative to the second valve seat;
The valve characterized by having. The first valve body is provided on a first sliding shaft protruding from one end of the first voice coil motor,
The second valve body is provided on a second sliding shaft protruding from one end of the second voice coil motor,
The valve according to claim 1. A first position sensor for detecting a position of the first sliding shaft is provided on the first sliding shaft protruding from the other end of the first voice coil motor;
A second position sensor for detecting a position of the first sliding shaft is provided on the second sliding shaft protruding from the other end of the second voice coil motor;
The valve according to claim 1 or 2, wherein The valve according to any one of claims 1 to 3,
A coating head for applying a coating liquid to a traveling long web;
A tank for storing the coating liquid;
A pump for pumping the coating liquid stored in the tank;
A pressure feed pipe for supplying the coating liquid from the pump to the inlet of the valve;
A liquid supply pipe for supplying a coating liquid from the first outlet of the valve to the coating head;
A circulation pipe for circulating a coating liquid from the second outlet of the valve to the tank;
Control means for performing intermittent coating on the web by opening and closing the first outlet of the valve;
The coating apparatus characterized by having. The control means increases the sliding speed of the first sliding shaft that opens the first outlet of the valve as the traveling speed of the web increases.
The coating apparatus according to claim 4, further comprising:

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