Rotating blade component in a mortar mixer

Abstract

The present invention addresses the problem of providing a rotating vane member of a mortar mixer that can vertically stir a mortar material having low flowability without the rotating vane member displacing vertically. A rotating vane member (11) is provided with: a central part (13) attached to a tip of a rotating shaft member (12); an outer peripheral part (17) extending in a circumferential direction about the central part (13); and a connecting part (18) connecting the central part (13) and the outer peripheral part. The outer peripheral part (17) includes a plurality of notch parts (21) provided in a rotational axis direction. The notch parts (21) are provided to allow the outer peripheral part (17) to stir mortar material vertically.

Description

Technical Field

[0001] The present invention relates to a rotary blade member for stirring mortar materials in a mortar mixer.

Background Art

[0002] For example, Patent Document 1 describes a mortar mixer including a stirring tank into which mortar materials are charged, a motor, a rotary shaft member rotated by the motor, and a rotary blade member attached to the lower end of the rotary shaft member.

[0003] FIGS. 6 and 7 show an example of a rotary blade member 1 in a conventional mortar mixer. The rotary blade member includes a central portion 3 attached to the lower end portion of the rotary shaft member 2, a plurality of inner blades 4 extending radially outward from the central portion 3, a cylindrical inner peripheral portion 5 whose inner peripheral surface is fixed to the outer end portion of the inner blade 4 and extends in the circumferential direction, a plurality of outer blades 6 extending radially outward from the outer peripheral surface of the inner peripheral portion 5, and a cylindrical outer peripheral portion 7 whose inner peripheral surface is fixed to the outer end portion of the outer blade 6 and extends in the circumferential direction. The upper and lower surfaces of the inner peripheral portion 5 and the outer peripheral portion 7 form an annular plane orthogonal to the rotation axis. The inner blades 4 and the outer blades 6 are generally flat plate-shaped and inclined in the vertical direction with respect to the circumferential direction.

Prior Art Documents

Patent Documents

[0004] [

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Mortar primarily consists of cement, fine aggregate (sand, etc.), and water. High-strength mortar, which has 3 to 4 times the strength of ordinary mortar, has a lower water content and is difficult to fluidize even with the addition of a dispersant, making it difficult to mix the mortar materials. As shown in Figure 7, even when attempting to agitate the high-strength mortar material M introduced into the mixing tank 8 by rotating the rotating blade member 1, it does not flow up and down despite the inclination of the inner blade 4 and outer blade 6, and is not sufficiently agitated. In concrete, the coarse aggregate (gravel, crushed stone, etc.) moves up and down, so the cement and fine aggregate are also agitated up and down, but since mortar does not contain coarse aggregate, this effect cannot be expected.

[0006] Therefore, workers used to mix high-strength mortar material by holding a hand mixer and moving it up and down while moving the rotating blades. However, in recent years, the use of large quantities of high-strength mortar has increased. Mixing by workers using a hand mixer required a lot of time and effort to secure a sufficient amount. Also, if the mixer itself were equipped with a mechanism to move the rotating blades up and down, it would be possible to mix large quantities of high-strength mortar material, but the equipment cost would increase.

[0007] In view of the above background, the present invention aims to provide a rotating blade member for a mortar mixer that can stir low-fluidity mortar material vertically even without the rotating blade member being displaced vertically. [Means for solving the problem]

[0008] To solve the above problems, one aspect of the present invention provides a rotating blade member (11, 31) attached at its center to the tip of a rotating shaft member (12) which is arranged along the axis of rotation in a mortar mixer and rotates around the axis of rotation, comprising an outer peripheral portion (17, 33) located around the center (13) and extending in the circumferential direction, and a connecting portion (18, 34) connected to the center (13) and the outer peripheral portion (17, 33), wherein the outer peripheral portion (17, 33) includes a plurality of notches (21, 37) provided from one direction to the other in the direction of the axis of rotation.

[0009] According to this embodiment, the mortar material is stirred vertically even without vertical displacement of the rotating blade member, thanks to the outer circumference provided with the notch.

[0010] In the rotating blade member (11) of the above embodiment, the outer circumference (17) may be cylindrical in shape, and the notch (21) may be concave in shape, opening on the side opposite to the side attached to the rotating shaft member in the direction of the rotation axis.

[0011] According to this embodiment, the load on the motor that rotates the rotating shaft member can be reduced compared to the case where the notch penetrates in the direction of the rotation axis and divides the outer circumference.

[0012] In the rotating blade member (11) of the above embodiment, the notch (21) may widen in the circumferential direction as it moves toward the opposite side in the direction of the rotation axis.

[0013] According to this embodiment, the load on the motor can be further reduced.

[0014] In the rotating blade member (31) of the above embodiment, the outer peripheral portion (33) may include a plurality of outer peripheral arc portions (38) that are spaced apart from each other in the circumferential direction by the notches.

[0015] According to this embodiment, the entire length in the direction of the rotation axis of the outer circular arc contributes to extruding the mortar material, thus enabling efficient vertical mixing of the mortar material.

[0016] In the rotating blade member (31) of the above embodiment, the connecting portion (34) extends radially and is fixed to the outer peripheral portion (33) at its radial outer end, and includes a plurality of outer blades (16) spaced apart from each other in the circumferential direction, and between the plurality of outer ends defined by adjacent outer blades (16), the notches (37) and the outer peripheral arc portions (38) may be alternately arranged in the circumferential direction.

[0017] In this embodiment, the side edges of the outer circular arc portion become integrated with the side edges of the outer blade when viewed from the circumferential direction, forming an L-shaped surface that pushes the mortar material up and down, thereby improving the mixing efficiency of the mortar material.

[0018] In the rotating blade member (31) of the above embodiment, the connecting portion (34) comprises an inner circumferential portion (32) positioned between the central portion (13) and the outer circumferential portion (33) and extending in the circumferential direction, a plurality of inner blades (14) extending between the central portion (13) and the inner circumferential portion (32) and fixed to the central portion (13) and the inner circumferential portion (32), spaced apart from each other in the circumferential direction, and a plurality of outer blades extending between the inner circumferential portion (32) and the outer circumferential portion (33) and fixed to the inner circumferential portion (32) and the outer circumferential portion (33). (16) and the inner circumferential portion (33) includes a plurality of inner circumferential arc portions (36) spaced apart from each other in the circumferential direction and fixed to the inner blade (14) on the inner circumferential surface, wherein the radial inner ends of two adjacent outer blades (16) with respect to the notch (37) are fixed to a common inner circumferential arc portion (36), and the radial inner ends of two adjacent outer blades (16) with respect to the outer circumferential arc portion (38) are fixed to separate inner circumferential arc portions (36).

[0019] In this configuration, the inner and outer circumferential arc sections are connected by the outer blade, resulting in a shape that extends continuously in the circumferential direction as a whole. Furthermore, since the inner blade is connected to each inner circumferential arc section, circumferential stress applied to a specific point on the rotating blade member is distributed and transmitted to the center, thereby stabilizing the rotation of the rotating blade member. [Effects of the Invention]

[0020] According to the above embodiment, it is possible to provide a rotating blade member for a mortar mixer that can stir low-fluidity mortar material vertically even without the rotating blade member being displaced vertically. [Brief explanation of the drawing]

[0021] [Figure 1] Plan view of the rotary blade member according to the first embodiment [Figure 2] Perspective view of the rotary blade member according to the first embodiment [Figure 3] Front view for explaining the usage state of the rotary blade member according to the first embodiment [Figure 4] Plan view of the rotary blade member according to the second embodiment [Figure 5] Perspective view of the rotary blade member according to the second embodiment [Figure 6] Plan view of the rotary blade member according to the prior art [Figure 7] Front view for explaining the usage state of the rotary blade member according to the prior art

Mode for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0023] FIG. 1 and FIG. 2 are a plan view and a perspective view of a rotary blade member 11 according to the first embodiment. The rotary blade member 11 is attached to the lower end of a rotary shaft member 12 arranged along the rotation axis in a mortar mixer, and stirs a mortar material M (see FIG. 3) by rotating around the rotation axis. The rotary shaft member 12 is arranged so that the rotation axis extends along the vertical direction.

[0024] The rotary blade member 11 includes a central portion 13 fixed to the lower end of the rotary shaft member 12, a plurality of inner blades 14 extending radially outward from the central portion 13, an inner peripheral portion 15 whose inner peripheral surface is fixed to the radially outer end portions of the plurality of inner blades 14, a plurality of outer blades 16 extending radially outward from the outer peripheral surface of the inner peripheral portion 15, and an outer peripheral portion 17 fixed to the radially outer end portions of the plurality of outer blades 16 at the inner peripheral surface. A connecting portion 18 including the plurality of inner blades 14, the inner peripheral portion 15, and the outer blades 16 connects the outer peripheral portion 17 to the central portion 13.

[0025] The central part 13 includes a cylindrical receiving portion 19 that opens upward and receives the lower end of the rotating shaft member 12. A screw 20 is threaded through the peripheral wall of the receiving portion 19 and screwed into the rotating shaft member 12 so that the rotating vane member 11 is fixed to the rotating shaft member 12. A keyway 39 extending in the direction of the rotating shaft axis is formed on the inner surface of the receiving portion 19 (see Figures 4 and 5), and a key (not shown) that engages with the keyway 39 may be provided on the rotating shaft member 12.

[0026] The inner blade 14 has a flat plate shape that is generally perpendicular to the axis of rotation, and both ends in the circumferential direction have a wedge shape that becomes thinner towards the ends. Multiple inner blades 14 are arranged at equal intervals from each other in the circumferential direction and are at the same height from each other in the vertical direction. In the illustrated example, there are four inner blades 14, but this number may be changed.

[0027] The inner circumference 15 has a cylindrical shape centered on the axis of rotation, and its upper and lower edges extend parallel to the circumferential direction. In the illustrated example, the inner blade 14 and outer blade 16 are fixed near the lower end of the inner circumference 15, but the fixing position may be changed to near the upper end of the inner circumference 15 or near the center in the vertical direction.

[0028] The outer blades 16 have a flat plate shape that is generally perpendicular to the axis of rotation, and the ends in the circumferential direction have a wedge shape that becomes thinner towards the ends. Multiple outer blades 16 are arranged at equal intervals from each other in the circumferential direction, offset from the inner blades 14 in the circumferential direction, and are at the same height from each other in the vertical direction. In the illustrated example, there are eight inner blades 14, but this number may be changed.

[0029] The outer periphery 17 has a cylindrical shape centered on the axis of rotation, and its upper edge extends parallel to the circumferential direction. The lower part of the outer periphery 17 is provided with a plurality of notches 21 that are concave in shape from bottom to top. The notches 21 are provided between the parts of the outer periphery 17 where adjacent outer blades 16 are connected. The plurality of notches 21 define a plurality of protrusions 22 on the lower part of the outer periphery 17. As a result, the lower edge of the outer periphery 17 has an uneven surface in the circumferential direction. In the illustrated example, there are eight notches 21 and eight protrusions 22, but this number may be changed. Preferably, the plurality of notches 21 are arranged at equal intervals from each other in the circumferential direction, the shapes of the plurality of notches 21 are preferably equal to each other, and the shapes of the plurality of protrusions 22 are also preferably equal to each other.

[0030] The notch 21 is generally trapezoidal when viewed radially, and its upper and lower bases are parallel to the circumferential direction. The depth of the notch 21 is approximately half the vertical length of the portion of the outer circumference 17 where the protrusion 22 is provided. The notch 21 widens circumferentially as it goes downwards, so that both side edges of the notch 21 slope outward in the circumferential direction as they go downwards. The shape of the notch 21 when viewed radially may be changed to, for example, a rectangle, a triangle, an arc, etc.

[0031] The protrusion 22 is provided on the outer circumference 17 where the outer blade 16 is connected. In the illustrated example, the outer blade 16 is fixed approximately in the center in the vertical direction of the portion of the outer circumference 17 where the protrusion 22 is provided, but it may also be fixed near the upper end or lower end of the outer circumference 17, or at a position offset in the circumferential direction from the protrusion 22. The protrusion 22 is generally trapezoidal when viewed from the radial direction, and its upper and lower bases are parallel to the circumferential direction.

[0032] Referring to Figure 3, the operation and effects of the rotating blade member 11 according to the first embodiment will be explained. Mortar material M introduced into the mixing tank 8 is mixed by the rotating blade member 11. The mortar material M contains cement, fine aggregate, and water, and also contains admixtures such as dispersants. With water introduced into the mixing tank 8, the water is mixed by the rotating blade member 11 while powdered cement and fine aggregate is introduced. At this time, the mixer does not move the rotating blade member 11 in the vertical direction, but because the notch 21 is provided, the mortar material M that flows into the notch 21 is pushed downward by the side edge of the notch 21. As a result, convection is generated in the mortar material M introduced into the mixing tank 8, and the mortar material M is mixed vertically. Because the notch 21 has a concave shape, the load on the motor that rotates the rotating shaft member 12 is smaller compared to the second embodiment which will be described later. Furthermore, because the side surface of the notch 21 has a shape that curves outward in the circumferential direction as it goes downward, the rotation of the rotating blade member 11 in the circumferential direction makes it easier to push the mortar material M that has flowed into the notch 21 downward, further reducing the load on the motor.

[0033] Next, a second embodiment of the present invention will be described. In this description, components common to the first embodiment will be omitted from the description and will be denoted by the same reference numerals.

[0034] Figures 4 and 5 are a plan view and a perspective view of the rotating blade member 31 according to the second embodiment. The rotating blade member 31 is attached to the lower end of the rotating shaft member 12 and agitates the mortar material M (see Figure 3) by rotating around the axis of rotation.

[0035] The rotating blade member 31 comprises a central part 13 fixed to the lower end of the rotating shaft member 12, a plurality of inner blades 14 extending radially outward from the central part 13, an inner circumferential part 32 whose inner surface is fixed to the radially outer ends of the plurality of inner blades 14, a plurality of outer blades 16 extending radially outward from the outer circumferential surface of the inner circumferential part 32, and an outer circumferential part 33 whose inner surface is fixed to the radially outer ends of the plurality of outer blades 16. A connecting part 34 including the plurality of inner blades 14, the inner circumferential part 32 and the outer blades 16 connects the outer circumferential part 33 to the central part 13.

[0036] The inner circumference portion 32 has a cylindrical circumferential wall centered on the axis of rotation, with a plurality of inner circumference notches 35 spaced equally apart in the circumferential direction. The inner circumference notches 35 penetrate the circumferential wall of the inner circumference portion 32 in the direction of the axis of rotation and in the radial direction. As a result, the inner circumference portion 32 has an arc shape when viewed from the direction of the axis of rotation and is divided into a plurality of inner circumference circular arc portions 36 spaced apart in the circumferential direction. The upper edges of the plurality of inner circumference circular arc portions 36 extend parallel to the circumferential direction and are at the same height to each other in the vertical direction. The lower edges of the plurality of inner circumference circular arc portions 36 extend parallel to the circumferential direction and are at the same height to each other in the vertical direction. The radial outer end of the inner blade 14 is fixed to the center of the inner surface in the circumferential direction and at the lower part in the direction of the axis of rotation in each inner circumference circular arc portion 36. One outer blade 16 extends radially outward from near the lower end of each circumferential end of the inner circumferential arc portion 36.

[0037] The outer periphery 33 has a cylindrical circumferential wall centered on the axis of rotation, with a plurality of notches 37 spaced equally apart in the circumferential direction. The notches 37 penetrate the circumferential wall of the outer periphery 33 in the direction of the axis of rotation and in the radial direction. As a result, the outer periphery 33 has an arc shape when viewed from the direction of the axis of rotation, and is divided into a plurality of outer circumferential arc sections 38 spaced apart in the circumferential direction. The upper edges of the plurality of outer circumferential arc sections 38 extend parallel to the circumferential direction and are at the same height to each other in the vertical direction. The lower edges of the plurality of outer circumferential arc sections 38 extend parallel to the circumferential direction and are at the same height to each other in the vertical direction. The upper and lower edges of the outer circumferential arc sections 38 are aligned with the upper and lower edges of the inner circumferential arc section 36 in the vertical direction. One outer blade 16 extends radially inward from near the lower ends of both ends of the outer circumferential arc section 38. The two outer blades 16 extending from a common inner circumferential arc portion 36 are fixed to the circumferential ends of separate outer circumferential arc portions 38. Consequently, the inner circumferential notches 35 and 37 are offset from each other in the circumferential direction.

[0038] In the illustrated example, there are four inner circumferential notches 35, four inner circumferential arcs 36, four notches 37, and four outer circumferential arcs 38, but this number can be changed. Furthermore, the circumferential ends of the inner circumferential arc 36 and outer circumferential arc 38 extend parallel to the axis of rotation, but they may be inclined upward or downward, or they may be wedge-shaped with upward and downward inclinations.

[0039] The effects and benefits of the rotating blade member 31 according to the second embodiment will be described below.

[0040] The mortar material M (see Figure 3) that flows into the inner circumferential notches 35 and 37 is pushed up and down by the side edges of the inner circumferential arc 36 and outer circumferential arc 38 defined by the inner circumferential notches 35 and 37. This creates convection in the mortar material M introduced into the mixing tank 8 (see Figure 3), causing the mortar material M to be stirred up and down. The entire length in the rotation axis direction of the inner circumferential arc 36 and outer circumferential arc 38 that push out the mortar material M contributes to pushing out the mortar material M, thus enabling efficient up and down stirring of the mortar material M.

[0041] The inner circumferential arc portion 36 and the outer circumferential arc portion 38 are connected to each other by the outer blade 16, resulting in a shape that extends continuously in the circumferential direction as a whole. Furthermore, since the inner blade 14 is connected to each inner circumferential arc portion 36, the circumferential stress applied to a specific point on the rotating blade member 31 is distributed and transmitted to the central part 13. As a result, the rotation of the rotating blade member 31 is stabilized.

[0042] Outer blades 16 are connected to both ends of the outer circumferential arc portion 38, and in multiple sections defined by the outer ends of adjacent outer blades 16, notches 37 and outer circumferential arc portions 38 are alternately arranged in the circumferential direction. As a result, the side edges of the outer circumferential arc portion 38, when viewed from the circumferential direction, become integrated with the side edges of the outer blades 16 to form an L-shaped surface that pushes the mortar material M up and down, improving the mixing efficiency of the mortar material M. Similarly, the side edges of the inner circumferential arc portion 36 and the outer blades 16 also form L-shaped surfaces that push the mortar material M up and down, improving the mixing efficiency of the mortar material M. [Examples]

[0043] Mixing tests of high-strength mortar were conducted for Examples 1 and 2, which correspond to the second embodiment, and for Examples 3 and 4, which correspond to Examples 3 and 4, which correspond to the first embodiment.

[0044] Nippon Splice Sleeve Co., Ltd. (Headquarters: Tokyo) sells ultra-high-strength clout material (product name: SS Mortar 120N). It is a dry powder containing cement, fine aggregate, and admixtures. One bag contains 25 kg. At 28 days of age and 20°C, it has a strength of 120 N / m². 2 The above strength was achieved. (Flow value: 185~285mm) was used. 3 kg of mixing water was used per 25 kg of ultra-high-strength kraut material. Mixing was performed by adding all the mixing water, then running the mixer and adding all of the ultra-high-strength kraut material over approximately 5 minutes. The inverter setting was 70 Hz (maximum). Other test conditions and results are shown in Table 1.

[0045] [Table 1]

[0046] In Example 1, the maximum current became excessive, causing the mixer to stop. This is thought to be because the torque during mixing was excessive, resulting in high resistance. In Example 2, the mortar condition was good, but the maximum current was higher than that of Examples 3 and 4. From this, it was found that the rotating blade member 31 of the second embodiment, corresponding to the first and second embodiments, placed a greater load on the motor than the rotating blade member 11 of the first embodiment, corresponding to the third and fourth embodiments. In Examples 3 and 4, the mortar condition was good.

[0047] This concludes the description of specific embodiments, but the present invention is not limited to the above embodiments or modifications and can be broadly modified and implemented. The rotating shaft member may be arranged inclined with respect to the vertical direction instead of being arranged along the vertical direction. The concave notch on the outer circumference in the first embodiment may be formed on the upper part of the outer circumference from top to bottom. The inner circumference in the first embodiment may be provided with a concave inner notch or an inner notch that penetrates vertically. The inner circumference in the second embodiment may be a cylindrical shape without a notch, or a cylindrical shape with a concave notch. In the second embodiment, the inner and outer arcs may protrude downwards from the inner and outer blades. The inner circumference may be omitted, and the center and outer circumference may be connected by a plurality of blades spaced apart from each other in the circumferential direction. The first and second blades may be inclined or curved in the circumferential direction and / or vertical direction with respect to the radial direction. [Explanation of Symbols]

[0048] 11,31: Rotating blade component 13: Center 14: Inner blade 15,32: Inner circumference 16: Outer blade 17,33: Outer perimeter 18,34:Connection part 21,37: Notch 22: Convex part 36: Inner circumferential arc 38: Outer circular arc section

Claims

1. A rotating blade member is attached at its center to the tip of a rotating shaft member that is positioned along the axis of rotation in a mortar mixer and rotates around the axis of rotation, An outer periphery located around the central part and extending in the circumferential direction, The system comprises a connecting portion that connects the central part and the outer periphery, The outer periphery includes a plurality of notches provided from one direction toward the other in the direction of the rotation axis, The outer circumference has a cylindrical shape, The notch has a concave shape that opens in one direction in the direction of the rotation axis, The notch widens in the circumferential direction as it moves toward one of the directions of the rotation axis, The other side of the notch is a rotating blade member that extends along the circumferential direction.

2. The other side in the direction of the rotation axis is the side attached to the rotation axis member in the direction of the rotation axis, according to claim 1.

3. The rotating blade member according to Claim 1, wherein the notch is trapezoidal when viewed from the radial direction.

4. A rotating blade member attached at its center to the tip of a rotating shaft member in a mortar mixer, which is arranged along the axis of rotation and rotates around the axis of rotation, An outer periphery located around the central part and extending in the circumferential direction, The system comprises a connecting portion that connects the central part and the outer periphery, The outer periphery includes a plurality of notches provided from one direction toward the other in the direction of the rotation axis, The outer periphery of the rotating blade member includes a plurality of outer circular arc portions that are spaced apart from each other in the circumferential direction by the notches.

5. The connecting portion includes a plurality of outer blades that extend radially, are fixed to the outer circumference at their radial outer ends, and are spaced apart from each other in the circumferential direction. The rotating blade member according to claim 4, wherein the notches and the outer circular arcs are alternately arranged in the circumferential direction between a plurality of outer ends defined by adjacent outer blades.

6. The connecting portion includes an inner circumferential portion disposed between the central part and the outer circumferential portion and extending in the circumferential direction, a plurality of inner blades extending between the central part and the inner circumferential portion and fixed to the central part and the inner circumferential portion, spaced apart from each other in the circumferential direction, and a plurality of outer blades extending between the inner circumferential portion and the outer circumferential portion and fixed to the inner circumferential portion and the outer circumferential portion. The inner circumferential portion includes a plurality of inner circumferential arc portions that are spaced apart from each other in the circumferential direction and fixed to the inner blade on the inner circumferential surface, The rotating blade member according to claim 4, wherein the radial inner ends of two adjacent outer blades, straddling the notch, are fixed to a common inner circumferential arc portion, and the radial inner ends of two adjacent outer blades, straddling the outer circumferential arc portion, are fixed to separate inner circumferential arc portions.

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