Continuous mixing apparatus, system, and continuous mixing method for powder/granular material and viscous liquid

Patent metadata

Field	Value
Publication number	US-2018243701-A1
Application number	US-201615756278-A
Country	US
Kind code	A1
Filing date	Oct 12, 2016
Priority date	Mar 28, 2016
Publication date	Aug 30, 2018
Grant date	—

Abstract

A continuous mixing apparatus for a powder/granular material and a viscous liquid, with a mixing cylinder, a shaft member which is on a central axis of the mixing cylinder and rotates inside the mixing cylinder, and a plurality of mixing paddles disposed on a surface of the shaft member, wherein the mixing cylinder is with a powder/granular material feed port on one end portion, a mixed material discharge port on the other end portion, and a viscous liquid injection unit between the powder/granular material feed port and the mixed material discharge port, and the plurality of mixing paddles are disposed on the shaft member so as to form a spiral around the central axis, the plurality of mixing paddles being, in at least a portion between the viscous liquid injection unit and the mixed material discharge port, attached to provide first rows having an attachment angle of 5° to 60°.

First claim

1 . A continuous mixing apparatus for a powder/granular material and a viscous liquid, provided with a mixing cylinder, a shaft member which is provided on a central axis of the mixing cylinder and which rotates inside the mixing cylinder, and a plurality of mixing paddles disposed on a surface of the shaft member, wherein:
the mixing cylinder is provided with a powder/granular material feed port on one end portion, a mixed material discharge port on another end portion, and a viscous liquid injection unit between the powder/granular material feed port and the mixed material discharge port; the plurality of mixing paddles are disposed on the shaft member so as to form a spiral around the central axis; and the plurality of mixing paddles are, in at least a portion between the viscous liquid injection unit and the mixed material discharge port, attached so as to alternately provide a first row having an attachment angle of 5° to 60°, from the direction of the mixed material discharge port, with respect to the central axis, and a second row having an attachment angle of −5° to 5° with respect to the central axis.

2 . The continuous mixing apparatus for a powder/granular material and a viscous liquid of claim 1 , wherein the plurality of mixing paddles, near the powder/granular material feed port, are attached at an attachment angle of 5° to 60°, from the direction of the mixed material discharge port, with respect to the central axis.

3 . The continuous mixing apparatus for a powder/granular material and a viscous liquid of claim 1 , wherein the plurality of mixing paddles, near the mixed material discharge port, are attached at an attachment angle of 120° to 150°, from the direction of the mixed material discharge port, with respect to the central axis.

4 . The continuous mixing apparatus for a powder/granular material and a viscous liquid of claim 1 , wherein:
the cross-sectional profile of the mixing cylinder is circular; the plurality of mixing paddles are each provided with a plate, the plate being provided with a rectangular part positioned on the shaft member side, and an arc part provided on the side of the rectangular part opposite to the shaft member and having a tip formed in an arc shape having a radius of curvature equal to that of the mixing cylinder; and the rectangular part is formed so that the ratio of the length in the diameter direction from the central axis of the mixing cylinder to the width in the direction orthogonal to the diameter direction is 1:0.5 to 1:3.

5 . A continuous mixing system for a powder/granular material and a viscous liquid provided with:
the continuous mixing apparatus for a powder/granular material and a viscous liquid of claim 1 ; a driving device connected to the shaft member; a transmission device that changes the rotation speed of the driving device; and a control device that controls the transmission device; wherein the control device rotates the shaft member at a mixing rotation speed of 600 to 1800 rpm.

6 . The continuous mixing system for a powder/granular material and a viscous liquid of claim 5 , further provided with a determination device that determines whether or not mixed material has filled the mixing cylinder.

7 . The continuous mixing system for a powder/granular material and a viscous liquid of claim 6 , wherein:
in an introduction period from when mixing is initiated with the mixing cylinder in an empty state until the determination device determines that mixed material has filled the mixing cylinder, the control device rotates the shaft member at an introduction rotation speed of 150 to 400 rpm, and after the determination device determines the filling of the mixed material, the rotation speed is changed to the mixing rotation speed.

8 . The continuous mixing system for a powder/granular material and a viscous liquid of claim 6 , wherein in a termination period after the supply of the powder/granular material is stopped in a state in which mixed material has filled the mixing cylinder and the determination device determines that mixed material does not fill the mixing cylinder, the control device changes the rotation speed of the shaft member from the mixing rotation speed to a termination rotation speed of 150 to 400 rpm.

9 . The continuous mixing system for a powder/granular material and a viscous liquid of claim 7 , wherein the rotation speed is changed stepwise or continuously.

10 . The continuous mixing system for a powder/granular material and a viscous liquid of claim 5 , further provided with a forward-reverse rotation device which is controlled by the control device and which modifies the rotational direction of the driving device.

11 . The continuous mixing system for a powder/granular material and a viscous liquid of claim 10 , wherein in the introduction period from when mixing is initiated with the mixing cylinder in an empty state until mixed material has filled the mixing cylinder, the control device reverse-rotates the shaft member at least once, for a period of 0.2 to 10 seconds each.

12 . The continuous mixing system for a powder/granular material and a viscous liquid of claim 10 , wherein in the termination period after the supply of the powder/granular material is stopped in a state in which mixed material has filled the mixing cylinder, the control device reverse-rotates the shaft member at least once, for a period of 0.2 to 10 seconds each.

13 . The continuous mixing system for a powder/granular material and a viscous liquid of claim 5 , wherein the control device calculates the required total run-time based on the time required for mixing a unit mass of mixed material and the mass of mixed material to be discharged, and controls the transmission device for the duration of the required total run-time.

14 . A continuous mixing method for a powder/granular material and a viscous liquid using a continuous mixing apparatus provided with a mixing cylinder, a shaft member which is provided on a central axis of the mixing cylinder and which rotates inside the mixing cylinder, and a plurality of mixing paddles disposed on a surface of the shaft member;
wherein the mixing cylinder is provided with a powder/granular material feed port on one end portion, a mixed material discharge port on another end portion, and a viscous liquid injection unit between the powder/granular material feed port and the mixed material discharge port; the plurality of mixing paddles are disposed on the shaft member so as to form a spiral around the central axis in the same direction as the rotational direction of the shaft member, the plurality of mixing paddles being, in at least a portion between the viscous liquid injection unit and the mixed material discharge port, attached so as to alternately provide a first row having an attachment angle of 5° to 60°, from the direction of the mixed material discharge port, with respect to the central axis, and a second row with an attachment angle of −5° to 5° with respect to the central axis; and wherein the method comprises: loading the powder/granular material from the powder/granular material feed port; injecting the viscous liquid from the viscous liquid injection unit; while rotating the shaft member to mix the powder/granular material and the viscous liquid, guiding the mixed material in the direction of the mixed material discharge port; and discharging the mixed material from the mixed material discharge port.

15 . The continuous mixing method for a powder/granular material and a viscous liquid of claim 14 , wherein the shaft member is rotated at a mixing rotation speed of 600 to 1800 rpm.

Assignees

• Sintokogio Ltd

Inventors

• OBA Takahumi
• Aoki Tatsuyuki
• Yoshino Mikio
• Horie Taisuke
• Aoki Yukinori

Classifications

• B22C5/04

  by grinding, blending, mixing, kneading, or stirring · CPC title

• B22C5/045 Primary

  Devices having a horizontal stirrer shaft in a fixed receptacle (B22C5/0422 takes precedence) · CPC title

• B22C5/0422 Primary

  Devices having a fixed receptable with rotating tools, some or all of these tools being rolls or balls loosely mounted on their axis or loose balls in contact with the side wall or the bottom of the receptacle, e.g. with aerating means; "Devices of the Muller type" · CPC title

• B01F2215/0477

  Numerical time values · CPC title

• B01F2215/0422

  Numerical values of angles · CPC title