JP4594339B2 - Cement kneading material stirring device - Google Patents

Description

  The present invention relates to a stirring device for stirring and kneading a cement kneading material.

  Conventionally, as shown in Patent Documents 1 and 2, the lower end of a cylindrical drum is closed with a flat bottom plate, and a rotary drive shaft is set up on the drum axis from the center of the flat bottom plate, and from the center of the flat bottom plate. An inner cylinder (cover cylinder) surrounding the rotation drive shaft is raised, a boss is integrally attached to the upper end of the rotation drive shaft, a plurality of stirring blades are extended from the boss via an arm, and the plurality of stirring blades are There is known a stirrer configured to stir the cement kneaded material by being disposed at various positions in the kneading chamber formed between the drum and the cover cylinder.

Japanese Patent Laid-Open No. 6-166020 JP-A-10-156162

  Thus, in the method of rotating the stirring blade on the flat bottom plate and stirring the cement kneaded material as in the conventional cement kneading material stirring device, the rotary drive shaft ( The cover cylinder) has a problem in that the cement kneading material existing around the surrounding kneading chamber is not sufficiently stirred and kneading unevenness occurs.

  This phenomenon is difficult to obtain an active mixed flow of the cement kneading material existing in the outer periphery of the kneading chamber and the cement kneading material existing in the outer periphery of the kneading chamber. This is caused by the difference in the peripheral speed of the stirring blades that stir the cement kneaded material existing in the part (the latter peripheral speed is slower than the former).

  Furthermore, when kneading a cement kneading material with less fluidity, such as polymer cement mortar with reinforcing fibers, not only the motor is overloaded, but the arm supporting the stirring blades is overloaded, causing torsion and drum vibration. It occurs and has a problem that it is difficult to properly exert the stirring function.

  The stirring device for cement kneading material according to the present invention surrounds the rotary drive shaft rising at the center of the outer drum with a large-diameter cylindrical inner drum, and allows the large-diameter crown drum to rotate integrally with the upper end of the rotary drive shaft. A stirring blade is extended from the crown drum through an arm.

  Preferably, the ratio of the diameter of the inner drum to the diameter of the outer drum, the ratio of the diameter of the crown drum to the diameter of the outer drum is set to 1: 3 to 1: 6, and the periphery of the kneading chamber is set to the inner drum. Use a crown drum.

  Further, a bottom plate that closes the lower end of the outer drum is formed by an inclined bottom plate that is inclined downward from the lower end of the inner drum toward the lower end of the outer drum, and is formed on the bottom outer peripheral portion of the kneading chamber formed between the outer drum and the inner drum. The lower end of the inclined base plate and the lower end of the outer drum define an acute outer peripheral annular corner, and the inner peripheral portion of the bottom of the kneading chamber has an obtuse inner peripheral annular corner at the upper end of the inclined base plate and the lower end of the inner drum. Is defined.

  Then, the outer peripheral corner corner impeller rotating along the acute outer peripheral annular corner and the inner peripheral corner stirring vane rotating along the obtuse inner peripheral annular corner are provided.

  Preferably, the inclination angle of the inclined bottom plate is set to a gentle gradient of 15 degrees to 30 degrees.

  The outer peripheral corner agitating blade is a first agitating blade rotating along the lower drum inner surface of the outer drum at the acute outer circumferential annular corner, and a lower inclined surface of the inclined bottom plate at the acute outer annular corner. A second agitating blade that rotates along the inner circumferential corner, and the inner agitating corner agitating blade rotates along the outer surface of the lower end of the inner drum at the obtuse inner circumferential annular corner. It comprises a fourth stirring blade that rotates along the upper end inclined surface of the inclined bottom plate at the inner peripheral annular corner.

  According to the present invention, the cement kneading material existing in the peripheral portion of the kneading chamber flows to the outer peripheral portion according to the inclined surface of the inclined bottom plate while being stirred by the inner peripheral corner stirring blade, and is uniformly stirred by the outer peripheral corner stirring blade. And kneading unevenness (insufficient kneading) in the periphery of the kneading chamber can be effectively eliminated.

  In addition, the annular space around the kneading chamber, where uneven kneading of the cement kneading material (kneading was insufficient), was reduced by the large inner drum and crown drum, and the effect of eliminating kneading unevenness in the same area was improved in a synergistic manner. can do.

  Incidentally, in a conventional cement kneading device agitator, the cover cylinder corresponding to the inner drum of the present invention is provided with the intention of protecting the rotary drive shaft. The ratio between the diameter and the inner diameter of the outer drum, that is, the ratio between the outer diameter of the boss and the inner diameter of the outer drum is about 1:10, and kneading unevenness in the periphery of the kneading chamber is difficult to avoid.

  Furthermore, according to the present invention, the length of the arm extending from the large-diameter crown drum is reduced while obtaining the effect of erasing the kneading chamber peripheral portion where uneven kneading has occurred due to the large-diameter crown drum. Reinforcement that enhances rigidity and strength, and can uniformly knead while suppressing the phenomenon of arm twisting and drum vibration during stirring of cement kneaded material, and has low fluidity due to the cooperation of the inclined bottom plate and stirring blade Its function as a stirring device such as a polymer cement mortar containing fibers can be exhibited without regret.

  The best mode for carrying out the present invention will be described below with reference to FIGS.

  The rotary drive shaft 3 rises on the drum axis from the center of the bottom plate 2 that closes the lower end of the cylindrical outer drum 1, and the large-diameter cylindrical interior surrounds the rotary drive shaft 3 from the center of the bottom plate 2. Start up drum 4.

  That is, the outer drum 1 is vertically raised from the outer peripheral edge of the bottom plate 2 formed in a circular shape in plan view, and the inner drum 4 is vertically extended from the outer peripheral edge of the rotary drive shaft insertion hole 9 formed in the inner peripheral portion of the bottom plate 2. The lower end of the large-diameter crown drum 5 is raised and is rotatably fitted to the outer peripheral surface of the upper end of the inner drum 4, and the crown drum 5 is attached to the upper end of the rotary drive shaft 3 so as to be integrally rotatable. .

  The upper end of the crown drum 5 is closed by a circular top plate 11 having a bolt insertion hole 14 in the center, and the bolt 13 is passed through the bolt insertion hole 14 of the top plate 11 above the rotary drive shaft 3 exposed from the upper end of the inner drum 4. It is screwed and fastened to a bolt fastening hole 15 that opens to the end face. Therefore, the lower end of the crown drum 5 is fitted to the inner drum 4 so as to be freely rotatable, and can be rotated integrally with the rotary drive shaft 3.

  In other words, the crown drum 5 is in contact with the upper end surface of the inner drum 4 directly or indirectly through the seat plate 16 while the lower surface of the top plate 11 is in contact with the upper end surface of the inner drum 4 and the crown drum 5. The space between the inner peripheral surfaces of the lower ends is sealed with an annular sliding material 12 (including an annular bearing) to prevent the cement kneading material from entering.

  As means for appropriately transmitting the rotational force of the rotary drive shaft 3 to the large-diameter crown drum 5, a wide area seat plate 16 is placed on the upper end surface of the rotary drive shaft 3, and the seat plate 16 is attached to the crown drum. 5, and the top driving plate 3 is overlapped with the top plate 11 to transmit the rotational driving force of the rotary driving shaft 3 to the large-diameter crown drum 5, the arm 6, and the stirring blade 7 through the seat plate 16.

The top plate 11 and the seat plate 16 of the crown drum 5 are fastened to the rotary drive shaft with bolts 13. Alternatively, the seat plate 16 is attached to the upper end surface of the rotary drive shaft 3 by welding.
Further, the bottom plate 2 is formed by an inclined bottom plate 2 that is inclined downward from the lower end of the inner drum 4 toward the lower end of the outer drum 1, and a kneading chamber 8 having an inner bottom surface inclined between the outer drum 1 and the inner drum 4 is formed. .

  The inclination angle α of the inclined bottom plate 2 is set to 15 degrees to 30 degrees.

  A motor 10 is provided below the inclined bottom plate 2, and the rotation drive shaft 3 of the motor 10 is sufficiently spaced on the central axis of the inner drum 4 through the rotation drive shaft insertion hole 9 at the center of the inclined bottom plate 2. Exist and launch.

  The inner and outer drums 4, 1, the crown drum 5, and the rotation drive shaft 3 are arranged concentrically with each other, a plurality of arms 6 are extended from the outer peripheral surface of the crown drum 5, and the stirring blade 11 is disposed at the end of the arm 6. The stirring blade 7 is extended from the outer peripheral surface of the crown drum 5.

  The stirring blade 7 rotates integrally with the rotary drive shaft 3 via the crown drum 5 and the arm 6 to stir the cement kneading material accommodated in the kneading chamber 8.

  The cement kneading material is a cement kneading material obtained by selectively blending various aggregates such as sand, gravel, slag, incinerated ash, and other waste materials, and in particular, cement and fluid synthetic resin together with these aggregates. Includes polymer cement mortar with reinforcing fibers blended with reinforcing fibers.

  At the bottom outer periphery of the kneading chamber 8, an acute outer peripheral annular corner 18 is defined at the lower end of the inclined bottom plate 2 and the lower end of the outer drum 1. An obtuse inner circumferential annular corner 19 is defined by the upper end of the bottom plate 2 and the lower end of the inner drum 4.

  On the other hand, the stirring blade 7 has an outer peripheral corner stirring blade 20 that rotates along the acute outer peripheral annular corner 18 and an inner peripheral corner stirring that rotates along the inner peripheral annular corner 19 of the obtuse angle. A blade 21 is provided.

  Further, the outer peripheral corner corner agitating blade 20 includes a first agitating blade 20a that rotates along (close to or in contact with) the inner surface of the lower end of the outer drum 1 in the acute annular corner corner 18 and the acute angle annular corner corner. In the part 18, it comprises the 2nd stirring blade 20b which rotates along the lower end inclined surface of the said inclination bottom board 2 (approaching or contacting). The second stirring blade 20b is inclined with an angle synchronized with the inclination angle of the inclined bottom plate 2.

  Further, the inner peripheral corner corner agitating blade 21 includes a third agitating blade 21a that rotates along (close to or in contact with) the lower end outer surface of the inner drum 4 at the obtuse annular corner corner 19 and the obtuse angle annular inlet. A fourth stirring blade 21b that rotates along (in proximity to or in contact with) the upper end inclined surface of the inclined bottom plate 2 at the corner 19 is formed. The fourth stirring blade 21b is inclined with an angle synchronized with the inclination angle of the inclined bottom plate 2.

  The first and second stirring blades 20 a and 20 b extend through a pair of arms 6 that can extend from both ends of the diameter line of the crown drum 5. The first and second stirring blades 20a and 20b constitute the outer peripheral corner corner mixing blade 20.

  Similarly, the third and fourth stirring blades 21 a and 21 b extend through a pair of arms 6 that can extend from both ends of a diameter line orthogonal to the diameter line of the crown drum 5. The third and fourth stirring blades 21a and 21b constitute the inner peripheral corner corner stirring blade 21.

  At least one of the first and second stirring blades 20a and 20b forming the outer peripheral corner corner stirring blade 20 is provided with the triangular corner corner stirring portion 22 that rotates at the corner of the acute annular corner corner 18. Form.

  Similarly, at least one of the third and fourth agitating blades 21a and 21b forming the inner peripheral corner corner agitating blade 21 is the corner corner agitator of the triangle rotating at the corner of the obtuse annular corner corner 19. Part 23 is formed.

  The cement kneading material in the outer peripheral portion of the kneading chamber 8 including the obtuse inner peripheral annular corner 19 is stirred by the inner peripheral corner stirring blade 21, and at the same time the acute outer peripheral annular inlet is stirred by the outer peripheral corner stirring blade 20. While stirring the cement kneading material in the outer peripheral portion of the kneading chamber 8 including the corner portion 18 and stirring the cement kneading material in the inner peripheral annular corner portion 19 having an obtuse angle by the inner peripheral corner stirring blade 21, the inner peripheral cement The kneaded material is moved to the outer peripheral portion of the kneading chamber 8 along the inclined bottom plate 2, and the inner and outer stirring blades 21, 20 and the inclined bottom plate 2 cooperate, and in addition, the inner drum 4 and the crown drum 5 are connected to each other. In cooperation, the AC circulation of the cement kneading material in the kneading chamber 8 can be activated to perform stirring and kneading without uneven kneading.

  As described above, the inclination angle α of the inclined bottom plate 2 that effectively induces the kneading operation is 15 degrees to 30 degrees.

  The ratio of the diameter of the inner drum 4 to the diameter of the outer drum 1 and the ratio of the diameter of the crown drum 5 to the diameter of the outer drum 1 are set to 1: 3 to 1: 6. The inner drum 4 and the crown drum 5 are used.

  As a specific example, the diameters of the crown drum 5 and the inner drum 4 are selected in a range of 15 cm to 30 cm, and the outer drum 1 having a diameter corresponding to the above ratio is selected.

  Conversely, the diameter of the outer drum 1 is selected in the range of 80 cm to 150 cm, and the crown drum 5 and the inner drum 4 are selected to have a diameter corresponding to the above ratio.

  According to the above stirring device, the kneading unevenness in the inner peripheral portion of the kneading chamber 8 can be effectively eliminated and the whole can be stirred uniformly.

  Further, the strength of the arm 6 that supports the stirring blade 7 can be improved, the twist of the arm 6 and the vibration of the entire apparatus can be effectively prevented, and the kneading of the cement kneading material having low fluidity can be appropriately handled.

  The outer drum 1 is mounted and supported on a loading platform having a plurality of leg posts 24, and is provided with a trochanter 25 at the lower end of the leg post 24 so as to be movable, and the trochanter 25 at the lower end of the leg post 24. Is provided with an operation lever 26 that is spaced apart from the installation surface, and the lower end of the pedestal 24 is directly installed on the ground by the separation of the trochanter 25.

  The motor 10 is disposed in the inner region of the pedestal 24 of the cargo bed, and an inverter 28 for controlling the rotational speed of the motor 10 is attached between the pedestals 24.

  The lid body 29 covers the upper opening of the outer drum 1, and the lid body 29 has a structure in which a metal wire 30 is assembled into a grid, and a large number of open windows 31 are formed between the grid-assembled metal wires 30. Have

  The lid 29 has an annular drum pad 32 made of a metal wire rod 30 having a diameter larger than the upper opening diameter of the outer drum 1 at the outermost periphery, and the annular drum pad 32 made of the ring metal wire rod 30 is attached to the outer drum. 1 is configured to be closed with an annular lid pad 33 at the upper end of the drum that defines the upper opening of the ring 1, and the annular metal wire 30 forming the annular drum pad 32 is opened to the upper end of the outer drum 1 through a hinge 34. Install as possible.

The top view of a stirring apparatus. The side view of a stirring apparatus. The rear view of a stirring apparatus. Sectional drawing which carries out the side view of the outer periphery entering corner part stirring blade of the said stirring apparatus. Sectional drawing which carries out a side view of the same internal peripheral corner stirring blade. The top view which removes a cover body from a stirring apparatus and shows.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Outer drum, 2 ... Inclined bottom plate, 3 ... Rotation drive shaft, 4 ... Inner drum, 5 ... Crown drum, 6 ... Arm, 7 ... Stirrer blade, 8 ... Kneading chamber, 9 ... Rotation drive shaft insertion hole, 10 ... Motor 11, top plate 12, annular sliding material 13 bolt, 14 bolt insertion hole 15 bolt tightening hole 16 seat plate 18 outer annular corner 19 inner annular corner Reference numeral 20: Outer peripheral corner stirring blade, 20a: First stirring blade, 20b: Second stirring blade, 21: Inner peripheral corner corner annular blade, 21a: Third stirring blade, 21b: Fourth stirring blade, 22, 23 ... corner corner stirring section, 24 ... pedestal, 25 ... trochanter, 26 ... operation lever, 28 ... inverter, 29 ... lid, 30 ... metal wire, 31 ... open window, 32 ... annular drum pad, 33 ... annular Lid, 34 ... Hinge

Claims (4)

The rotary drive shaft is raised on the drum axis from the center of the bottom plate that closes the lower end of the cylindrical outer drum, and the cylindrical inner drum that surrounds the rotary drive shaft is raised from the center of the bottom plate, and the above rotation A crown drum is attached to the upper end of the drive shaft so as to be integrally rotatable, a stirring blade is extended from the crown drum through an arm, and the bottom plate is formed by an inclined bottom plate that is inclined downward from the lower end of the inner drum toward the lower end of the outer drum. A kneading chamber is formed between the outer drum and the inner drum, an acute outer peripheral annular corner is defined at the bottom outer periphery of the kneading chamber at the lower end of the inclined bottom plate and the lower end of the outer drum, and the kneading chamber An inner peripheral annular corner having an obtuse angle at the upper end of the inclined bottom plate and the lower end of the inner drum, and an outer peripheral corner that rotates along the acute outer peripheral annular corner as the stirring blade. While having a stirring blade, Stirrer cement kneaded material, characterized in that it comprises an inner circumferential inner corner portion agitating blade rotating along the annular interior corner portion. 2. The stirring apparatus for a cement kneading material according to claim 1, wherein the ratio of the diameter of the inner drum and crown drum to the diameter of the outer drum is set to 1: 3 to 1: 6. The stirrer for a cement kneading material according to claim 1, wherein an inclination angle of the inclined bottom plate is set to 15 to 30 degrees. The outer peripheral corner agitating blade is a first agitating blade rotating along the lower drum inner surface of the outer drum at the acute outer circumferential annular corner, and a lower inclined surface of the inclined bottom plate at the acute outer annular corner. A second agitating blade that rotates along the inner circumferential corner, and the inner agitating corner agitating blade rotates along the outer surface of the lower end of the inner drum at the obtuse inner circumferential annular corner. 2. The cement kneading apparatus according to claim 1, further comprising a fourth stirring blade that rotates along an upper end inclined surface of the inclined bottom plate at an inner circumferential annular corner.

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