JPH0576535U - Sand mill - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To prevent wear of the valve part that introduces the mixture into the stirring container and prevent the valve operation from being hindered by the media in the stirring container. [Structure] The valve seat 17 of the valve portion 10 with which the valve body 13 abuts
In addition, a taper is formed so that the outer circumference is low and the inner circumference is high. As a result, the valve body 13 makes the valve seat 1 of the valve portion 10
Even when it is separated from 7, the medium in the stirring container 4 does not collide with the valve seat 17 and the valve seat 17 is less likely to be worn. Even when the operation of the sand mill is stopped, the medium does not enter into the valve portion 10 through the gap between the valve body 13 and the valve portion 10 which is about to be closed, so that the movement of the valve body is not hindered and the reliable valve operation is ensured. Done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sand mill for uniformly dispersing a dispersoid in a dispersion medium for a mixture in which a dispersoid is mixed with a dispersoid, such as ink, paint, magnetic paint for magnetic recording medium and the like.

[0002]

[Prior Art]

Explaining an example of a conventional sand mill with reference to FIG. 3, a shaft 6 which is rotationally driven by a motor as a driving source 5 is arranged in a cylindrical stirring container 4, and stirring blades 7, 7, ... , 9 ... are fixed at regular intervals. A duct 11 for introducing the mixture is connected to the lower portion of the stirring container 4, an outlet 15 for the mixture is provided on the upper portion, and a screen 20 is provided in front of the outlet 15. The mixture of the dispersion medium and the dispersoid is sent from the tank 2 side through the duct 12 to the pump 3, where a pressure of about 0.3 to 5.0 Kg / cm ² is applied, and the introduction duct 11 is introduced. After that, it is pressurized and introduced into the stirring container 4. In the stirring container 4, a fine granular medium having a particle diameter of 0.5 to 3 mm is stored in an amount of 40 to 90% of the volume of the stirring container. This media does not pass through the screen 20.

In this sand mill, the inlet of the duct 11 at the bottom of the stirring container 4 has a structure as shown in FIG. That is, the tip of the duct 11 is connected to a cylindrical valve portion 10 mounted so as to penetrate through the bottom wall of the stirring container 4, and the mortar-shaped surface, that is, the outer peripheral side is high and A valve seat 17 formed by a tapered surface with a low circumferential side is formed. A valve body support portion 14 having a passage 22 through which the mixture passes is provided inside the valve portion 10, and a slide rod 18 extending downward from the valve body 13 has a valve body support portion 14. It is slidably passed through and supported by. The valve body 13 has a taper surface corresponding to the taper of the valve seat 17 of the valve portion 10, and as shown in FIG. 4A, the taper surface abuts the valve seat 17 of the valve portion 10, The opening of the valve portion 10 is closed. A spring 21 is attached to the slide rod 18 between the slide rod 18 and the valve body support portion 14, and an elastic force is applied to the spring 21 in a direction in which the valve body 13 contacts the valve seat 17 of the valve portion 10. There is.

When the mixture is pressurized and conveyed from the pump 3 through the duct 11 into the stirring container 4, the valve body 13 receives this pressure, and as shown in FIG. It is pushed up against the elasticity of the mixture and the mixture is sent into the stirring container 4 through the open valve portion 10. The mixture thus pressurized and introduced into the stirring container 4 from the bottom is stirred and mixed together with the medium by the rotation of the stirring blade 7, and the dispersoid is gradually and uniformly dispersed in the dispersion medium. Further, this mixture is pushed by the mixture pressurized and introduced from the bottom of the stirring vessel 4 in addition to the shearing action by the rotation of the stirring blade 7, and gradually rises in the stirring vessel. Then, after the mixture is separated from the medium on the screen 20, it is taken out of the stirring container 1 through the discharge port 15.

[0005]

[Problems that the device is trying to solve]

 However, in the conventional sand mill, since the valve seat 17 of the valve portion 10 has a mortar-shaped taper surface, when the valve body 13 is separated from the valve seat 17 of the valve portion 10 and the valve portion 10 is open, The granular medium stirred in the stirring container 4 collides with the valve seat 17, and the valve seat 17 is easily worn. For this reason, if the sand mill continues to operate, the degree of closure of the valve portion 10 gradually deteriorates, and the sealed state of the valve portion 10 cannot be gradually maintained. Further, when the pumping of the mixture is stopped from the duct 11 side and the operation of the sand mill is stopped, the taper of the valve seat 17 as described above tends to close the medium from the gap between the valve body 13 and the valve portion 10 by which the medium is released. Enter the section 10. For this reason, when the sand mill is re-driven and the mixture is pressure-fed from the duct 11 side to the stirring container 4 to open the valve portion 10, the medium obstructs the movement of the valve element, resulting in poor valve operation. was there. In view of the above-mentioned conventional problems, an object of the present invention is to provide a sand mill in which the valve portion for introducing the mixture into the stirring container is less worn and the valve operation is not hindered by the medium.

[0006]

[Means for Solving the Problems]

 That is, in order to achieve the above object, in the present invention, a duct 11 for pressurizing and sending the mixture to the stirring container 4, and a valve portion 10 provided at a portion of the duct 11 for introducing the mixture into the stirring container 4 are provided. A valve body 13 for opening and closing the valve portion 10, a discharge port 15 for discharging the mixture to the outside of the stirring container 4, a stirring blade 7 fixed to a shaft 6 inserted in the stirring container 4, and the shaft. In the sand mill having the drive source 5 for rotating the valve 6, the valve seat 17 of the valve portion 10 with which the valve body 13 abuts is formed with a taper that is low on the outer peripheral side and high on the inner peripheral side. Provide a Sand Mill Sand Mill.

[0007]

[Action]

 In the sand mill of the present invention, since the valve seat 17 of the valve portion 10 with which the valve body 13 abuts has a taper that is low on the outer peripheral side and high on the inner peripheral side, the valve body 13 is the valve portion 10. Even when the valve portion 10 is opened and the valve portion 10 is open, the medium in the stirring container 4 does not enter the valve portion 10 along the taper of the valve seat 13 and the Do not collide. Therefore, the valve seat 17 is less likely to be worn. Further, even when the pressure feed of the mixture is stopped from the duct 11 side and the operation of the sand mill is stopped, the medium does not enter the valve portion 10 through the gap between the valve body 13 and the valve portion 10 which are about to be closed. For this reason, when the sand mill is re-driven and the mixture is pressure-fed from the duct 11 side to the stirring container 4 to open the valve portion 10, the medium does not hinder the movement of the valve element and a reliable valve operation is performed. Be done.

[0008]

【Example】

 Next, embodiments of the present invention will be described in detail with reference to the drawings. The basic structure of the sand mill according to the present invention is the same as that shown in FIG. 3, and the difference lies in the inlet for introducing the mixture into the stirring container 4, that is, the valve portion 10. Therefore, the structure of the valve portion 10 will be described. As shown in FIGS. 1 and 2, the tip of the duct 11 is attached to the cylindrical valve portion 10 which is installed so as to penetrate the bottom wall of the stirring container 4. The valve seat 17 is formed on the upper end edge of the valve portion 10. A valve body support portion 14 having a passage 22 through which the mixture passes is provided inside the valve portion 10, and a slide rod 18 extending downward from the valve body 13 is provided on the valve body support portion 14. It is slidably penetrated and supported. The valve body 13 has a surface corresponding to the taper of the valve seat 17 of the valve portion 10, and as shown in FIG. The part 17 is closed. A spring 21 is attached to the slide rod 18 between the slide rod 18 and the valve body support portion 14, and a resilient force is applied to the blade 21 in a direction in which the valve body 13 contacts the valve seat 17 of the valve portion 10. It

Here, in the present invention, the valve seat 17 of the valve portion 10 has a taper such that it is low on the outer peripheral side and high on the inner peripheral side, and the valve body 13 is the valve seat 17 of the valve portion 10. Has a surface having a taper corresponding to the taper, and the taper surface contacts the valve seat 17 to close the valve portion 10. Since the valve seat 17 is thus tapered, the medium in the stirring container 4 is less likely to collide with the valve seat 17 even when the valve body 13 is separated from the valve seat 17 of the valve portion 10. Further, even when the operation of the sand mill is stopped, the medium does not enter the valve portion 10 through the gap between the valve body 13 and the valve portion 10 which are about to be closed. In the embodiment shown in FIG. 1, the outer diameters of the valve body 13 and the valve portion 10 are equal, and when the valve portion 10 is closed, the outer peripheral edge of the valve body 13 coincides with the outer peripheral edge of the valve seat 17. .. On the other hand, the outer diameter of the valve body 13 shown in FIG. 2 is larger than the outer diameter of the valve portion 10, and when the valve portion 10 is closed, the outer peripheral edge of the valve body 13 is outside the outer peripheral edge of the valve seat 17. Located in. This makes it difficult for the media to enter the valve portion 10.

[0010]

[Effect of the device]

 As described above, according to the present invention, it is possible to provide a sand mill in which the valve portion for introducing the mixture into the stirring container is less worn and the valve operation is not hindered by the medium.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a valve part in which a mixture of a sand mill according to an embodiment of the present invention is introduced into a stirring container.

FIG. 2 is a cross-sectional view of a main part showing a valve portion into which a mixture of a sand mill according to another embodiment of the present invention is introduced into a stirring container.

FIG. 3 is a schematic sectional view showing the overall structure of a sand mill.

FIG. 4 is a cross-sectional view of a main part showing a valve part in which a mixture of a sand mill showing a conventional example is introduced into a stirring container.

[Explanation of symbols]

 4 Stirring container 5 Drive source 6 Shaft 10 Valve part 11 Duct 13 Valve body 15 Stirring container discharge port 17 Valve seat of valve part

Claims (1)

[Reference number] 0031171-01 [Claims for utility model registration] 1. A duct 11 for pressurizing and sending a mixture to a stirring container 4, a valve portion 10 provided at a portion of the duct 11 for introducing the mixture into the stirring container 4, and a valve body for opening and closing the valve portion 10. 13 and a discharge port 15 for discharging the mixture to the outside of the stirring container 4.
In a sand mill having a stirring blade 7 fixed to a shaft 6 inserted in a stirring container 4 and a drive source 5 for rotating the shaft 6, a valve seat of the valve portion 10 with which a valve body 13 abuts. The sand mill is characterized in that the taper 17 has a taper that is low on the outer peripheral side and high on the inner peripheral side.