JP2001028122A - Method and device for quantitatively supplying liquid material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method and device for quantitatively supplying a liquid material by which a small quantity of magnetic coating material can rationally be supplied. SOLUTION: This device for quantitatively supplying a liquid material is provided with a meter 20 internally provided with a piston 20a connected to a rod 21a of an air cylinder 21 on the way of pipings 13 and 13a from an additive tank 9 to a mixing tank 1. Additive mixed liquid pressurized by a pressurizing gas 25a is introduced to the meter 20 and supplied into the mixing tank 1 with a prescribed quantity by the piston 20a by operating the air cylinder 21. Thereby, the device can deal with various form since the quantity of the liquid to be supplied is metered by the volume of the meter 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for quantitatively supplying a liquid material suitable for, for example, mixing predetermined amounts of various additives into a magnetic paint.

[0002]

2. Description of the Related Art A magnetic recording medium such as a magnetic tape has a structure in which a magnetic layer is formed on the surface of a base film. The magnetic layer is obtained by mixing a hardener and a lubricant with a dispersion paint in which magnetic particles are dispersed. In the case of a magnetic tape, the mixed magnetic paint is applied to the surface of the base film, dried, and then formed through a calendering process and a slitting process.

[0003] The magnetic paint used for such a magnetic recording medium is diluted by adding an organic solvent to a kneaded mixture of a binder containing an organic solvent solution and a magnetic powder and then subjecting the mixture to a dispersion treatment. Further, an additive such as an abrasive or carbon black is added, and the mixture is kneaded and provided for coating.

FIG. 4 shows an example of a system for supplying a magnetic paint to a coating process by a conventional method of supplying an additive mixture (hereinafter sometimes referred to as an additive).

As shown in FIG. 4, the supply of the magnetic paint to the coating process is performed by pumps 5, 11, 14 and flow meters 6, 12, 12 from the magnetic paint tank 4, the additive tank 9, and the additive tank 10, respectively. A certain amount of the magnetic paint and additive mixture is supplied to the mixing tank 1 several times via the mixer 15, and the supply is stopped when the mixture reaches the position of the level sensor 2 of the mixing tank 1.

[0006] After being stirred in the mixing tank 1, they are supplied to the coating process by the pump 18. When the contents become lower than the level sensor 2, they are supplied again. When the contents reach the level sensor 2, the supply is stopped. Or a feed method in which the operation / stop is controlled by feeding back from each flow meter to the pump.

In such a supply system, the supply amount of the additive mixture from each of the additive tanks 9 and 10 in one supply amount is 200 to 300 cc, and the magnetic paint is 5 to 10 cc.
Liters, which is sufficiently possible with the accuracy guarantee of current pumps and flow meters. However, magnetic tapes in recent years tend to be thinner.

Accordingly, the consumption of the magnetic paint per time is inevitably reduced, and the supply amount of the additive per one time is 10 to 40 cc and the magnetic paint is required to be 1 to 2 liters. There are no pumps or flow meters that can control minute amounts and satisfy the accuracy guarantee.

The magnetic paint is a viscous paint having a structural viscosity (thixotropic property), and its structure is changed over time (2
で 3 hours) (for example, gelation and the time until gelation is called pot life), and the magnetic properties are liable to change accordingly.

[0010]

However, the capacity of the mixing tank 1 at present is 30 to 40 liters, and the amount of paint supplied to the coating process has become very small with the thinning of the magnetic tape. Since the capacity is too large, if the magnetic paint has passed the pot life due to some trouble, a loss due to discarding the entire amount has occurred.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for quantitatively supplying a liquid material that can be applied to a small amount of the liquid material.

[0012]

That is, according to the present invention, when a second liquid material to be mixed with a first liquid material by a predetermined amount is guided by a pipe, the second liquid material is measured by a measuring means provided in the pipe. 2 is weighed and once stored in the weighing means with this amount, and then the liquid material is supplied from the weighing means to derive the predetermined amount of the second liquid material.
This is referred to as the supply method of the present invention. ).

According to the supply method of the present invention, the amount measured by the measuring means is temporarily stored in the measuring means and then a predetermined amount is derived, so that the amount of the liquid material can be measured by the measuring means, and the liquid can be measured once. After being accommodated in the means, at least a portion thereof can be derived as a predetermined amount.
Therefore, it is possible to set the measuring capacity of the measuring means to a specified amount in advance, and to derive a predetermined amount (that is, all or a part of the measuring capacity) of the capacity. as a result,
If it is possible to measure a very small amount, it can correspond to various forms.

Further, the present invention has a pipe for guiding a second liquid to be mixed with the first liquid in a predetermined amount, and a measuring means provided in the pipe, wherein the second liquid is provided. A liquid material quantitative supply device (hereinafter, referred to as the present invention) in which a predetermined amount of the second liquid material is discharged from the measuring means after the body is once stored in the measuring means in the measured amount. ).

According to the supply apparatus of the present invention, since the apparatus is based on the above-described supply method of the present invention, it is possible to provide a supply apparatus having the same effects.

Here, the "liquid" is a concept including a mixed liquid such as a dispersion liquid, a suspension, a solution and the like.

[0017]

Embodiments of the present invention will be described below.

In the supply method and the supply apparatus of the present invention described above, a predetermined amount of the additive liquid mixture as the second liquid is supplied to the magnetic paint as the first liquid supplied to the mixing tank. Providing an additive tank (for example, 5 liters) containing the additive mixture,
The measuring means in which a suction / discharge means for suctioning / discharging the additive mixed liquid is provided in a pipe for supplying the additive from the additive tank to the mixing tank arranged on the downstream side thereof After the additive mixture is pressurized by the pressurizing means from the additive tank and injected into the measuring instrument by forward movement of the suction / discharge means, the predetermined amount of the additive mixture is mixed. It is desirable that the liquid be pressurized and discharged by the backward movement of the suction / discharge means and supplied to the mixing tank.

In this case, it is preferable that the suction / discharge means is operated by an air cylinder, and is constituted by a cylinder portion and a piston portion provided therein.

It is preferable that the additive mixture is pressurized and supplied to the measuring device by introducing an inert gas into the additive tank.

In this case, it is preferable to use dry nitrogen as the inert gas.

The position of the piston portion of the suction / discharge means corresponding to the measured amount or the predetermined amount of the additive mixture may be detected by a proximity switch provided on the measuring device. desirable.

In this case, it is preferable that the mounting position of the proximity switch is adjustable, and the proximity switch is provided at at least two places in the moving direction of the piston portion of the suction / discharge means.

Further, it is desirable that the completion of the injection of the additive mixture into the measuring instrument is detected by a pressure switch.

With the above configuration, it can be suitably used for producing a magnetic paint for a magnetic recording medium.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but it goes without saying that the present invention is not limited to the following embodiments.

According to the preferred embodiment of the present invention described above, an apparatus for supplying a magnetic paint was manufactured. FIG. 1 is a schematic diagram showing this supply device. Note that the same reference numerals are used for parts common to the conventional example.

As shown, the overall arrangement of the mixing tank 1, the magnetic paint tank 4 for supplying the magnetic paint thereto, and the additive tanks 9 and 10 for supplying the additives is the same as that of the conventional example shown in FIG. However, in this embodiment, the measuring device 2 for supplying the additive is used.
0, 22 are provided, and pressurized by the pressurized gas 25a, 25b, and the measuring devices 20, 22 are supplied from the additive tanks 9, 10.
The mixing tank 1 is also reduced in size to 5 liters.

The measuring device 20 is disposed on a pipe 13 extending from the additive tank 9 to the mixing tank 1, and a piston 20a provided in the measuring device 20 is connected to an air cylinder 21 via a rod 21a. . Then, the meter 20 close to the upper switch S _1, the bottom is provided a proximity switch S _2, further pressure switch 24a is provided.

FIG. 2 is an enlarged view of the vicinity of the above-described measuring device 20, and the operation is roughly classified.

That is, as shown in FIG. 2A, the additive mixture 26 supplied from the additive tank 9 is
Is started to be injected into the measuring device 20 via the pipe 13.

Then, as shown in FIG. 2 (b), while pushing up the piston 20a in the measuring device 20, the additive mixture 2
6 is injected.

Then, as shown in FIG. 2 (c), when the piston 20a reaches the top dead center and the meter mixture 20 is filled with the additive mixture 26, this state is _{first changed} by the proximity switch S1. The arrival of the piston 20a at the top dead center is detected, and at the same time, the filling of the additive mixture 26 into the meter 20 is detected by the pressure switch 24a.

Then, as shown in FIG. 2D, the air cylinder 21 is operated by introducing air, and the rod 21a is operated.
By pushing down the piston 20a connected by the above, the additive mixed liquid 26 in the measuring device 20 is discharged via the pipe 13a and supplied into the mixing tank 1.

The measuring device 22 arranged on the pipe 16 from the other additive tank 10 to the mixing tank 1 is also operated by a piston 22a, a rod 23a, a cylinder 23, proximity switches S ₃ and S ₄ and a pressure switch 24b. It is configured in the same manner as the above-described measuring device 20, and operates in the same manner as shown in FIG.

FIGS. 1, 2 and 3 show the operation and function of each part.
This will be described with reference to the flowchart shown in FIG.

First, the supply of the magnetic paint from the magnetic paint tank 4 to the mixing tank 1 is started by the supply start command A ₁ from the control unit B. The supply of the magnetic paint is supplied from a pipe 7 via a pump 5 and a flow meter 6 as in the conventional case shown in FIG. A predetermined amount of the supply amount of the magnetic paint is controlled by the control unit B.

At the same time, a valve opening command A ₂ from the controller B
Valve V ₁ of the pipe 13 and 16 from the additive tank 9, 10 to the weighing device _{20,22, V 2, V 3,} V 4 is opened, the additive mixture from each additive tank 9 Weighing the supplied initiated a ₃ from the lower side vessel 20, 22.

As shown in FIG. 1, the additive tanks 9, 10
Is constantly pressurized by pressurized gas 25a, 25b with dry nitrogen, and the additive mixture is automatically fed into the measuring devices 20, 22 with the valve opening. The measuring devices 20 and 22 have a volume corresponding to the volume supplied at one time.

When the additive mixture is supplied to the measuring devices 20 and 22, the pistons 20a and 22a are supplied as shown in FIG.
Is pushed up and reaches the top dead center, the upper proximity switch S ₁ S ₃ detects A _{4, and} at the same time, this signal is sent to the control unit B. At this time, pressure is also generated in the measuring devices 20 and 22 by the pressurized gas.

[0041] At the same time, the pressure switch 24a, 24b detects A ₅ that additive mixture was charged into the meter 20, 22, the detection signal is sent to the control unit B.

[0042] Simultaneously the control unit B receives these signals to a closing command A ₆ of the valve V ₁ ~V _4. Thus, the supply of the additive mixture to the measuring devices 20 and 22 is stopped.

At the same time, the valves V ₅ ,
The opening command 7 V _6, the piping 13a from meter 20, 22 to the mixing tank 1, is 16a route to open.

Subsequently, compressed air is introduced into the air cylinders 21 and 23 from an air supply system (not shown) according to an air cylinder operation command A ₈ from the control unit B, and the air cylinders are operated. Thus the additive mixture the piston 20a within the meter 20, 22 is extruded to 22a, dispensing A ₉ begins to mixing tank 1.

The piston 20a, 22a is which detects A ₁₀ is the proximity switch S _2, S ₄ when arrived at the bottom dead center, and sends a detection signal to the control unit B. At the same time, pressure switches 24a, 2
4b detects A ₁₁ the pressure in the meter 20, 22, and sends the signal to the control unit B.

Upon receiving this signal, the control section B stops the operation of the air cylinder A ₁₂ , and at the same time, instructs the valves V ₅ and V _{6 to} close, thereby terminating the supply of the additive mixture.

The above operation is repeated until the mixture of the magnetic paint and the additive mixture reaches the position of the level sensor 2 of the mixing tank 1, and these operations are monitored by a monitor.

Although the capacity of the mixing tank 1 in the supply system of this embodiment is 5 liters, as described above, the amount of the magnetic paint used in the coating step is reduced due to the decrease in the amount of the magnetic paint used as the magnetic tape becomes thinner. The required amount of paint can be sufficiently covered, and the adverse effect on the magnetic paint due to the pot life can be minimized.

According to this embodiment, each part is downsized and the measuring devices 20 and 22 measure a very small amount so as to cope with the decrease in the amount of magnetic paint used as the magnetic tape becomes thinner. Therefore, it is possible to supply a small amount of additive, and it is possible to manufacture and supply a necessary amount of the magnetic paint, thereby suppressing waste of the magnetic paint.

The above embodiment can be variously modified based on the technical idea of the present invention.

For example, the capacity of the above-described measuring devices 20 and 22 is a volume for accommodating the amount of one additive mixture to be supplied, and this is a method of supplying all at once.
By adding a proximity switch for detecting the lowering of the piston, such as S ₀ and S _n indicated by a chain line in FIG. 2A, the additive mixture can be discharged in a plurality of times. Alternatively, it can be moved between S ₁ and S ₂ shown by a two-dot chain line. In this case, if the capacity of the measuring devices 20 and 22 is increased, this can be easily performed.

If the stroke of the rod of the air cylinder 21 is made variable, the actual volume can be adjusted even with the same measuring device.

Further, the specifications, structures and the like of each part of the device of the embodiment can be appropriately set other than those of the embodiment.

Further, the apparatus of the embodiment can be applied to mixing of various liquids and additive mixed liquids in addition to the production of magnetic paints.

[0055]

As described above, according to the present invention, when the second liquid material to be mixed with the first liquid material by a predetermined amount is guided by the pipe, the second liquid is measured by the measuring means provided in the pipe. Is weighed and once stored in the weighing means with this amount, and the predetermined amount of the second liquid material is led out from the weighing means, so that the amount of the liquid material can be measured by the weighing means. At the same time, at least a part thereof can be derived as a predetermined amount after being once stored in the measuring means. Therefore, it is possible to set the measuring capacity of the measuring means to a specified amount in advance, and to derive a predetermined amount (that is, all or a part of the measuring capacity) of the capacity.
As a result, it is possible to cope with various forms if a minute amount can be measured.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a magnetic paint supply apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged view schematically showing the operation of the measuring device.

FIG. 3 is a flowchart from the supply of the mixed liquid of the magnetic paint and the additive to the end thereof.

FIG. 4 is a schematic diagram showing a magnetic paint supply device according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mixing tank, 2 ... Level sensor, 4 ... Magnetic paint tank, 5, 11, 14, 18 ... Pump, 6, 12, 15
... Flow meter, 7, 13, 16, 17 ... Piping, 9, 10 ... Additive tank, 20,22 ... Measuring device, 20a, 22a ... Piston, 21,23 ... Air cylinder, 21a, 23a
... Rod, 24 ... Pressure switch, 25 ... Pressurized gas, 26
... additive mixture, S ₁ to S ₄ ... proximity sensor, A ₁ to A
₁₃ ... the operation of each unit, V ₁ ~V ₆ ... valve

Claims (20)

[Claims] When a second liquid to be mixed with a first liquid in a predetermined amount is introduced by a pipe, the second liquid is measured by a measuring means provided in the pipe.
A method for quantitatively supplying a liquid material, in which the predetermined amount of the second liquid material is led out from the measuring device after being once stored in the measuring device with this amount. 2. A method for supplying a predetermined amount of an additive mixture as a second liquid to a magnetic coating material as a first liquid supplied to a mixing tank, wherein the additive mixture is And a suction / discharge for sucking / discharging the additive mixture in a pipe for supplying the additive from the additive tank to the mixing tank disposed downstream of the additive tank. A measuring device as the measuring device in which the device is provided is provided, the additive mixture is pressurized from the additive tank by a pressurizing device, and injected into the measuring device by forward movement of the suction / discharge device. 2. The method according to claim 1, wherein the predetermined amount of the additive mixture is pressurized and discharged by the backward movement of the suction / discharge means, and then supplied to the mixing tank. 3. The method according to claim 2, wherein said suction / discharge means is operated by an air cylinder and comprises a cylinder portion and a piston portion provided therein. 4. The method for quantitatively supplying a liquid material according to claim 2, wherein the additive mixture is pressurized and supplied to the measuring device by introducing an inert gas into the additive tank. 5. The method according to claim 4, wherein dry nitrogen is used as the inert gas. 6. The proximity switch provided on the measuring device detects a position of the piston portion of the suction / discharge unit corresponding to the measured amount or the predetermined amount of the additive mixture. Item 4. The method for quantitatively supplying a liquid material according to Item 3. 7. The method according to claim 6, wherein an attachment position of the proximity switch is adjustable. 8. The method according to claim 3, wherein the proximity switch is provided at at least two positions in a moving direction of the piston portion of the suction / discharge unit. 9. The method according to claim 2, wherein the end of the injection of the additive mixture into the measuring device is detected by a pressure switch. 10. The method according to claim 1, which is used for producing a magnetic paint for a magnetic recording medium. 11. A pipe for guiding a second liquid to be mixed in a predetermined amount with the first liquid, and a measuring means provided in the pipe, wherein the second liquid is measured. A predetermined amount of the second liquid material is led out of the measuring means after being once stored in the measuring means at a predetermined amount. 12. An apparatus in which a predetermined amount of an additive mixture as a second liquid is supplied to a magnetic coating material as a first liquid supplied to a mixing tank. A suction tank for sucking / discharging the additive mixture in a pipe for supplying the additive from the additive tank to the mixing tank disposed downstream of the additive tank; A measuring device as the measuring device having a discharging device provided therein is provided, the additive mixture is pressurized from the additive tank by a pressing device, and the measuring device is moved forward by the suction / discharging device. 12. The fixed quantity supply of the liquid material according to claim 11, wherein the predetermined amount of the additive mixed liquid is pressurized and discharged by the return of the suction / discharge means, and then supplied to the mixing tank after being injected into the inside. apparatus. 13. The liquid material supply device according to claim 12, wherein the suction / discharge means is operated by an air cylinder, and is constituted by a cylinder portion and a piston portion provided therein. 14. An apparatus for quantitatively supplying a liquid material according to claim 12, wherein the additive mixture is pressurized and supplied to the measuring device by introducing an inert gas into the additive tank. . 15. The apparatus for quantitatively supplying a liquid material according to claim 14, wherein dry nitrogen is used as the inert gas. 16. A position of the piston portion of the suction / discharge means corresponding to the measured amount or the predetermined amount of the additive mixture is detected by a proximity switch provided on the measuring device. The liquid material supply apparatus according to claim 13. 17. The liquid material supply apparatus according to claim 16, wherein a mounting position of the proximity switch is adjustable. 18. The apparatus for quantitatively supplying a liquid material according to claim 13, wherein the proximity switch is provided at at least two places in a moving direction of the piston portion of the suction / discharge unit. 19. The apparatus according to claim 12, wherein the end of the injection of the additive mixture into the measuring device is detected by a pressure switch. 20. The apparatus according to claim 11, which is used for producing a magnetic paint for a magnetic recording medium.