Stirring device

Abstract

To effectively stir an object to be stirred with a simple constitution.SOLUTION: A stirring device comprises: a bottomed box-shaped container 10 having a released upper part; a rotary shaft 30 rotatably supported to the container 10; and stirring members 31, 34 rotatably provided integrally with the rotary shaft 30 and capable of stirring an object to be stirred put into the container 10. The stirring members 31, 34 comprise: first rod stocks 32, 35 extending from a prescribed part of the rotary shaft 30 toward a radial direction of the rotary shaft 30; and second rod stocks 33, 36 in which respective one ends are connected to tips of the first rod stocks 32, 35 and respective the other ends are connected to an axial end part of the rotary shaft 30.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a stirring device, and particularly to a technology suitable for stirring various materials such as concrete, mortar, powder, and granular materials.

Background Art

[0002] In recent years, repair work on concrete structures and the like has been increasing. For such repair work, from the perspective of reducing the life cycle cost and improving productivity, high-strength and highly durable materials are often used. High-strength and highly durable materials have excellent fluidity, but their fluidity decreases when left standing for a long time. Therefore, under construction conditions that require long-term transportation or temporary storage, it is desirable to continuously stir the materials until they are placed at the site.

[0003] As an example of a device for stirring various materials, for example, in Patent Document 1, an arc-shaped stirring rod is provided on a rotating shaft supported by a hopper, and a device is disclosed that feeds out powdery or granular chemical fertilizers introduced into the hopper while stirring them with the stirring rod. Further, in Patent Document 2, a plurality of plate-shaped stirring blades are provided on a rotating shaft supported by a hopper, and a device is disclosed that kneads the concrete introduced into the hopper while stirring it with the stirring blades.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, if the apparatus described in Patent Document 1 is used to mix concrete or mortar, it may not be possible to mix uniformly and efficiently because the gap between the rotating shaft and the arc-shaped mixing rod is wide. Furthermore, the arc-shaped mixing rod has a so-called cantilever structure, with only one end fixed to the rotating shaft. For this reason, when mixing materials with high mixing resistance, such as concrete or mortar, there is a possibility that durability issues may arise.

[0006] On the other hand, while the apparatus described in Patent Document 2 above can mix concrete and mortar, the mixing blades are formed in a plate shape, so when used to mix highly viscous materials, the load on the mixing blades becomes large. For this reason, it is necessary to use a high-output motor to rotate the rotating shaft, which leads to problems such as the size of the apparatus and an increase in cost.

[0007] The technology disclosed herein has been made in view of the above circumstances, and aims to provide a stirring device that can effectively stir a material with a simple configuration. [Means for solving the problem]

[0008] The stirring device of the present disclosure comprises a bottomed box-shaped container with an open top, a rotating shaft rotatably supported in the container, and a stirring member provided integrally and rotatably on the rotating shaft and capable of stirring a substance to be stirred placed in the container, wherein the stirring member has a first rod extending radially from a predetermined portion of the rotating shaft, and a second rod having one end connected to the tip of the first rod and the other end connected to the axial end of the rotating shaft.

[0009] Furthermore, it is preferable that the first rod extends linearly from the axial middle portion of the rotating shaft toward the radial direction of the rotating shaft, and the second rod extends in an arc-shaped curve toward the axial end of the rotating shaft from the tip of the first rod, so that the first rod and the second rod form a fan-shaped or quarter-circular opening between them and the rotating shaft.

[0010] Furthermore, it is preferable that the stirring member further comprises a third rod extending radially from between the first rod and the second rod of the rotating shaft.

[0011] Furthermore, it is preferable that the third rod is positioned with respect to the rotation axis at a rotational phase 90 degrees different from that of the first and second rods.

[0012] Furthermore, it is preferable to further include a motor as a power source and a power transmission mechanism that transmits the power of the motor to the rotating shaft.

[0013] Furthermore, it is preferable that the power transmission mechanism includes a drive sprocket rotatably mounted integrally with the output shaft of the motor, a driven sprocket rotatably mounted integrally with the rotating shaft and having a larger diameter than the drive sprocket, and a chain belt wrapped around the drive sprocket and the driven sprocket.

[0014] Furthermore, it is preferable that the bottom of the container is provided with an outlet for discharging the agitated material inside the container, and that the outlet is provided with a lid member that can open or close the outlet. [Effects of the Invention]

[0015] According to the stirring device of this disclosure, the material to be stirred can be effectively stirred with a simple configuration. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic diagram illustrating an example of how the stirring device according to this embodiment is used. [Figure 2] This is a schematic plan view of the stirring device according to this embodiment, viewed from above. [Figure 3] This is a schematic side view of the stirring device according to this embodiment, viewed from the side. [Figure 4] This is a schematic side view of the stirring device according to this embodiment, viewed from the side. [Figure 5] It is a schematic perspective view showing a pair of first and second main stirring members provided on the rotating shaft of the stirring device according to this embodiment, and a pair of first and second sub-stirring members. [Figure 6] It is a schematic perspective view for explaining the stirring rod of the stirring device of the comparative example. [Figure 7] It is a schematic perspective view showing the stirring member of the stirring device according to another embodiment. [Figure 8] It is a schematic perspective view showing the stirring member of the stirring device according to another embodiment. [Figure 9] It is a schematic perspective view showing the stirring member of the stirring device according to another embodiment. [Figure 10] It is a schematic perspective view showing the stirring member of the stirring device according to another embodiment.

Mode for Carrying Out the Invention

[0017] Hereinafter, based on the accompanying drawings, the stirring device according to this embodiment will be described. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated.

[0018] [Usage Mode] FIG. 1 is a schematic diagram for explaining an example of the usage mode of the stirring device 1 according to this embodiment. The stirring device 1 is used, for example, at a construction site for constructing or renovating a concrete structure, when transporting the concrete carried into the site while stirring it, or when temporarily placing it while stirring it.

[0019] In FIG. 1, reference numeral P1 indicates a receiving location for receiving concrete, and reference numeral P2 indicates a driving location for driving the concrete. The construction site in the illustrated example is, for example, complicated or cramped, and it is difficult to directly transport the concrete to the driving location P2 by an agitator truck V or the like.

[0020] Concrete produced at batching plants, etc., is transported to the receiving area P1 at the construction site by agitator truck V. At the receiving area P1, the concrete is poured from agitator truck V into the hopper 10 of the mixing device 1. The mixing device 1, with the concrete poured into it, is transported to the pouring area P2 by a crane C, forklift F, etc. at the construction site. The concrete transported to the pouring area P2 is poured by being discharged from the hopper 10 of the mixing device 1 at an appropriate timing according to the construction conditions, etc.

[0021] In this embodiment, the mixing device 1 functions to continuously mix the concrete from the time it is received at the receiving location P1 until it is discharged at the placement location P2, or during the period when the concrete is temporarily stored at the site due to a problem or other reason. By continuously mixing the concrete from the time it is received until it is placed, it is possible to reliably prevent a decrease in fluidity, even with high-strength and high-durability concrete. By preventing a decrease in fluidity, the filling properties of the concrete can be effectively maintained, and the risk of unfilled areas can be significantly reduced. Although Figure 1 shows an example in which concrete is transported to the construction site by an agitator truck V, the concrete may also be manufactured at a batching plant installed at the site and then dropped into the mixing device 1 for transport to the placement location P2. The detailed configuration of the mixing device 1 in this embodiment will be described below with reference to Figures 2 to 5.

[0022] [Agitation device] Figure 2 is a schematic plan view of the stirring device 1 according to this embodiment, viewed from above, and Figures 3 and 4 are schematic side views of the stirring device 1 according to this embodiment, viewed from the side. In each figure, some internal components are shown with dashed lines.

[0023] As shown in Figures 2, 3, and 4, the stirring device 1 comprises a hopper 10 (container), a support frame 20 that supports the hopper 10, a rotating shaft 30, stirring members 31, 34, 38, and 39 that are integrally rotatable on the rotating shaft 30, a motor 40 as a power source, and a power transmission mechanism 50 that transmits the rotational power of the motor 40 to the rotating shaft 30.

[0024] The hopper 10 is formed in the shape of a bottomed box with an open top. Specifically, the hopper 10 has, in order from the top, a side wall portion 11 that is approximately octagonal in shape when viewed from above, an inclined wall portion 12 that is in the shape of an inverted truncated cone and narrows downwards from the lower end of the side wall portion 11, and a rectangular tubular discharge wall portion 13 that extends downwards from the lower end of the inclined wall portion 12. Note that the shape of the hopper 10 is not limited to the illustrated example, and for example, the side wall portion 11 may be cylindrical, the inclined wall portion 12 may be in the shape of an inverted truncated cone, and the discharge wall portion 13 may be cylindrical with a smaller diameter than the side wall portion 11. Alternatively, the entire hopper 10 may be formed in the shape of a hemisphere that curves downwards in an arc.

[0025] An outlet 13A is provided at the lower end of the discharge wall 13. A sliding plate-shaped cover member 14 that can open and close the outlet 13A is also attached to the lower end of the discharge wall 13. This cover member 14 slides laterally in response to the operation of the discharge handle 15 (see Figures 3 and 4), switching the outlet 13A between open and closed. When the outlet 13A is closed, concrete is stored in the hopper 10, and when the outlet 13A is opened, the concrete in the hopper 10 is discharged downward from the outlet 13A (concrete is poured).

[0026] Furthermore, the opening and closing of the lid member 14 is not limited to manual operation by a handle, but may also be automatic, such as by an actuator. Also, the lid member 14 is not limited to a sliding type, but may also be a rotating type using a hinge mechanism, etc.

[0027] The support frame 20 has six vertical support columns 21A, 21B, 21C, 21D, 21E, and 21F, and four horizontal support columns 22A, 22B, 22C, and 22D.

[0028] Of the six vertical support columns 21A, 21B, 21C, 21D, 21E, and 21F, the upper ends of four of them, 21A, 21B, 21C, and 21D, are fixed to the outer surface of the side wall 11 of the hopper 10 by welding or bolts and nuts. The remaining two vertical support columns 21E and 21F are positioned at a predetermined distance from the hopper 10, on the opposite side from vertical support columns 21A and 21B, with vertical support columns 21C and 21D in between.

[0029] The four vertical support columns 21A, 21B, 21E, and 21F are formed to be longer than the vertical dimension of the hopper 10, so that a predetermined clearance is secured between the discharge port 13A and the ground when the agitator 1 is grounded. In addition, the upper ends of the four vertical support columns 21A, 21B, 21E, and 21F are each provided with a lifting fitting 23 (see Figures 3 and 4) for engaging the hook of the crane C or the like.

[0030] The two vertical supports 21C and 21D are formed to be shorter than the vertical dimension of the hopper 10. The lower ends of these vertical supports 21C and 21D are fixed to the horizontal supports 22A and 22B, which will be described later, by welding or bolts and nuts.

[0031] The four horizontal supports 22A, 22B, 22C, and 22D are positioned below the side wall 11 of the hopper 10 and are spanned between the vertical supports 21A, 21B, 21C, 21D, 21E, and 21F. Specifically, horizontal support 22A spans vertical supports 21A and 21E, horizontal support 22B spans vertical supports 21B and 21F, horizontal support 22C spans vertical supports 21A and 21B, and horizontal support 22D spans vertical supports 21E and 21F. The horizontal supports 22A, 22B, 22C, and 22D, and the vertical supports 21A, 21B, 21C, 21D, 21E, and 21F are fixed to each other by welding or bolts and nuts.

[0032] A base 24 for mounting the motor 40 is attached between the vertical support 21C and vertical support 21E of the horizontal support 22A, between the vertical support 21D and vertical support 21F of the horizontal support 22B, and on the horizontal support 22D. In addition, multiple protective plates 25A, 25B, 25C, and 25D are attached to the parts of each vertical support 21C, 21D, 21E, and 21F above the base 24 to prevent foreign matter such as concrete from adhering to the motor 40 and the power transmission mechanism 50.

[0033] The rotating shaft 30 is rotatably supported on the side wall portion 11 of the hopper 10 such that its axis of rotation is horizontal. Specifically, a pair of opposing wall portions 11A and 11B (see Figure 2) of the side wall portion 11 are provided with through holes through which the rotating shaft 30 is inserted, and bearings 17 are attached to the outside of these through holes. The rotating shaft 30 is rotatably supported on the side wall portion 11 by being pivotally supported at both ends in the axial direction by the bearings 17. A driven sprocket 52 of the power transmission mechanism 50, which will be described later, is attached to the end of the rotating shaft 30 that protrudes outward from wall portion 11A.

[0034] The stirring members 31, 34, 38, and 39 each consist of a pair of main stirring members 31 and 34 formed in a fan shape (quarter-circular shape) with a central angle of approximately 90 degrees, and a pair of secondary stirring members 38 and 39 extending in a straight line. Details of these stirring members 31, 34, 38, and 39 will be described later.

[0035] The motor 40 is, for example, a three-phase AC motor, and is driven by power supplied from a power source installed at the construction site. The power source for the motor 40 may also be provided by installing a battery in the stirring device 1. Furthermore, the power source is not limited to the motor 40; other drive devices (e.g., industrial engines) can also be used.

[0036] The power transmission mechanism 50 includes a drive sprocket 51 that is integrally rotatable on the output shaft of the motor 40, a driven sprocket 52 that is integrally rotatable on the rotating shaft 30, and a chain belt 53 wrapped around these sprockets 51 and 52.

[0037] The driven sprocket 52 is formed to have a larger diameter than the drive sprocket 51, and is designed to reduce the rotational power of the motor 40 and transmit it to the rotating shaft 30. This allows for effective stirring of highly viscous materials even when using a motor 40 with low output torque. Furthermore, the miniaturization of the motor 40 makes it possible to easily secure the necessary power on-site. Note that the configuration of the power transmission mechanism 50 is not limited to the sprockets 51, 52 and chain belt 53 shown in the example, but other mechanisms capable of transmitting rotational power, such as pairs of gears that mesh with each other, may be used.

[0038] [Agitation component] Figure 5 is a schematic perspective view showing a pair of first and second main stirring members 31, 34 and a pair of first and second secondary stirring members 38, 39 provided on the rotating shaft 30 of the stirring device 1 according to this embodiment.

[0039] The first and second main stirring members 31 and 34 are formed in the same fan shape with respect to the rotation axis 30, and are arranged point-symmetrically with respect to the axial intermediate portion C of the rotation axis 30. The first and second secondary stirring members 38 and 39 (third rod members of this disclosure) are formed in the shape of rods that extend linearly in opposite directions with respect to the rotation axis 30.

[0040] The first main stirring member 31 has a straight rod 32 (the first rod in this disclosure) that extends radially in a straight line from the axial middle part C of the rotating shaft 30, and an arc-shaped rod 33 (the second rod in this disclosure) that curves in an arc and extends from one end of the rotating shaft 30 toward the tip of the straight rod 32. The tip of the straight rod 32 and the tip of the arc-shaped rod 33 are joined and fixed to each other by welding or the like. The base end of the straight rod 32 and the base end of the arc-shaped rod 33 are fixed to the outer circumferential surface of the rotating shaft 30 by welding or bolts, respectively.

[0041] The second main stirring member 34 has a straight rod 35 (first rod in this disclosure) that extends radially in a straight line from the axial middle part C of the rotating shaft 30 to the opposite side from the straight rod 32 of the first main stirring member 31, and an arc-shaped rod 36 (second rod in this disclosure) that extends in an arc shape from the other end of the rotating shaft 30 toward the tip of the straight rod 35. The tip of the straight rod 35 and the tip of the arc-shaped rod 36 are joined and fixed to each other by welding or the like. The base end of the straight rod 35 and the base end of the arc-shaped rod 36 are fixed to the outer circumferential surface of the rotating shaft 30 by welding or bolts, respectively.

[0042] The axial lengths of the straight rods 32 and 35, and the curvature of the arcuate rods 33 and 36, should be set appropriately within a range that ensures a predetermined clearance between the rotational trajectory of the arcuate rods 33 and 36 and the inner surface of the inclined wall portion 12 of the hopper 10 (see Figures 2-4).

[0043] The straight rod 32 and the arc rod 33 define a fan-shaped (quarter-circular) opening X1 with a central angle of approximately 90 degrees between them and the rotation axis 30. The straight rod 35 and the arc rod 36 define a fan-shaped (quarter-circular) opening X2 with a central angle of approximately 90 degrees between them and the rotation axis 30. As the rotation axis 30 rotates, the first and second main stirring members 31 and 34 rotate, allowing the concrete in the hopper 10 to pass through the openings X1 and X2, thereby enabling uniform mixing of the concrete. Furthermore, by fixing the base ends of the arc rods 33 and 36 to the rotation axis 30 and fixing the tips of the arc rods 33 and 36 to the tips of the straight rods 32 and 35 extending from the rotation axis 30, the arc rods 33 and 36 are configured in a so-called double-supported structure with both ends supported, thereby reliably improving the strength of the main stirring members 31 and 34.

[0044] The first and second auxiliary stirring members 38 and 39 are straight rods and are provided substantially perpendicular to the rotation axis of the rotating shaft 30. Specifically, the first and second auxiliary stirring members 38 and 39 extend in opposite directions relative to the rotation axis of the rotating shaft 30. The first auxiliary stirring member 38 is positioned substantially midway between the axial middle portion C of the rotating shaft 30 and one end of the rotating shaft 30, and the second auxiliary stirring member 39 is positioned substantially midway between the axial middle portion C of the rotating shaft 30 and the other end of the rotating shaft 30.

[0045] Specifically, the first auxiliary stirring member 38 is positioned approximately in the center of the opening X1 of the first main stirring member 31, and the second auxiliary stirring member 39 is positioned approximately in the center of the opening X2 of the second main stirring member 34. As a result, the concrete passing through the opening X1 of the first main stirring member 31 is continuously stirred by the first auxiliary stirring member 38, and furthermore, the concrete passing through the opening X2 of the second main stirring member 34 is continuously stirred by the second auxiliary stirring member 39, making it possible to stir the concrete in the hopper 10 uniformly and efficiently.

[0046] In this embodiment, the first main stirring member 31 and the first secondary stirring member 38 are arranged so that their rotational phases differ by approximately 90 degrees, and the second main stirring member 34 and the second secondary stirring member 39 are arranged so that their rotational phases differ by approximately 90 degrees.

[0047] Specifically, the angle between the first auxiliary stirring member 38 and the straight rod 32 is approximately 90 degrees when viewed in the axial direction of the rotation axis 30; in other words, the axis of the first auxiliary stirring member 38 is positioned to be approximately perpendicular to the opening surface of the opening X1. Similarly, the angle between the second auxiliary stirring member 39 and the straight rod 35 is approximately 90 degrees when viewed in the axial direction of the rotation axis 30; in other words, the axis of the second auxiliary stirring member 39 is positioned to be approximately perpendicular to the opening surface of the opening X2.

[0048] This arrangement allows concrete stirred by the first main stirring member 31 to be followed by the first secondary stirring member 38, and concrete stirred by the second main stirring member 34 to be followed by the second secondary stirring member 39, enabling efficient stirring even of highly viscous materials.

[0049] In the illustrated example, the first main stirring member 31 is positioned approximately 90 degrees ahead of the first secondary stirring member 38 in the rotational direction R of the rotation axis 30, and the second main stirring member 34 is positioned approximately 90 degrees ahead of the second secondary stirring member 39 in the rotational direction R of the rotation axis 30. However, the arrangement is not limited to this, and these arrangements may be swapped.

[0050] [Effects and Effects] Next, the effects and advantages of the stirring device 1 according to this embodiment will be explained using the comparative example shown in Figure 6.

[0051] Figure 6 shows a comparative example stirring device 100 used for stirring powdered or granular materials such as chemical fertilizers. The stirring device 100 is equipped with arc-shaped main stirring rods 310 and 340 and linear auxiliary stirring rods 380 and 390 on a rotating shaft 300. The main stirring rods 310 and 340 have a so-called cantilever structure, with only one end fixed to the rotating shaft 300, which may cause durability problems when stirring highly viscous materials. In addition, the openings X100 and X200 partitioned by the main stirring rods 310 and 340 and the rotating shaft 300 are wide, which may prevent effective stirring of the material.

[0052] In contrast, in the stirring device 1 of this embodiment, the arc-shaped rods 33 and 36 of the main stirring members 31 and 34 are supported at both ends in a so-called double-supported structure. Furthermore, the openings X1 and X2, which are partitioned by the main stirring members 31 and 34 and the rotating shaft 30, are formed to be narrower than the openings X100 and X200 of the comparative example, by connecting straight rods 32 and 35 to the arc-shaped rods 33 and 36. As a result, even when the stirring device 1 is used to stir concrete, mortar, or highly viscous materials, it is possible to stir the material to be stirred uniformly and efficiently without causing problems with the durability of the main stirring members 31 and 34.

[0053] As described in detail above, the mixing device 1 of this embodiment is configured to allow for continuous mixing of concrete during long-distance transport and long-term temporary storage from the time the concrete is received at the site until it is placed. This ensures that even high-strength and highly durable concrete does not lose its fluidity, effectively maintaining the concrete's filling properties while significantly reducing the risk of unfilled areas.

[0054] Furthermore, by continuously stirring the concrete in the hopper 10, it becomes possible to prevent the concrete from hardening inside the hopper 10, and maintenance effort can be effectively reduced. In addition, by making the stirring members 31, 34, 38, and 39 rod-shaped, it becomes possible to easily clean the inside of the hopper 10.

[0055] Furthermore, by making the stirring members 31, 34, 38, and 39 rod-shaped and reducing the load during stirring, it becomes possible to use a motor 40 with a lower output, which allows for a smaller overall size of the device and further reduces costs. It also makes it easier to secure power at the site.

[0056] Furthermore, by positioning the rotating shaft 30 supported by the hopper 10 horizontally, the posture of the agitator 1 can be stabilized when it is lifted by the crane C or lifted by the forklift F, effectively preventing the agitator 1 from falling off or tipping over during transport.

[0057] Furthermore, since the concrete in the hopper 10 can be immediately discharged from the discharge port 13A after production and then placed, it becomes possible to produce concrete continuously.

[0058] [others] Furthermore, this disclosure is not limited to the embodiments described above, and can be modified and implemented as appropriate without departing from the spirit of this disclosure.

[0059] For example, in the above embodiment, the stirring device 1 was described as comprising a pair of main stirring members 31, 34 and a pair of secondary stirring members 37, 38. However, as shown in Figure 7, the stirring device 1 may be configured to include only the main stirring members 31, 34, omitting the secondary stirring members 38, 39.

[0060] Furthermore, the number of main stirring members 31, 34 and secondary stirring members 37, 38 is not limited to two each. As shown in Figure 8, a pair of first main stirring members 31 and a pair of second main stirring members 34 may be arranged symmetrically with respect to the axis of the rotation shaft 30, and a pair of first secondary stirring members 38 and a pair of second secondary stirring members 39 may be arranged symmetrically with respect to the axis of the rotation shaft 30.

[0061] Furthermore, as shown in Figure 9, the arc-shaped rods 33 and 36 of the main stirring members 31 and 34 may be bent at multiple points according to the shape of the hopper 10, and as shown in Figure 10, the straight rods 32 and 35 of the main stirring members 31 and 34 may be offset by a predetermined amount from the axial intermediate part C of the rotation shaft 30, so that a part of the main stirring members 31 and 34 overlap.

[0062] Furthermore, the scope of application of this disclosure is not limited to the mixing of concrete, but can also be broadly applied to the mixing of various materials such as mortar, powders, and granules. [Explanation of symbols]

[0063] 1…Agitator, 10…Hopper (container), 11…Side wall, 12…Inclined wall, 13…Discharge wall, 13A…Discharge port, 14…Lid member, 15…Discharge handle, 20…Support frame, 21A, 21B, 21C, 21D, 21E, 21F…Vertical support, 22A, 22B, 22C, 22D…Horizontal support, 30…Rotation shaft, 31…First main agitator, 32…Straight rod (first rod), 33…Arch rod (second rod), 34…Second main agitator, 35…Straight rod (first rod), 36…Arch rod (second rod), 38…First secondary agitator (third rod), 39…Second secondary agitator (third rod), 40…Motor, 50…Power transmission mechanism, 51…Drive sprocket, 52…Driven sprocket, 53…Chain belt

Claims

1. A bottomed box-shaped hopper with an open top, A rotating shaft rotatably supported in the hopper, The hopper is equipped with a stirring member that is rotatably mounted integrally with the rotating shaft and capable of stirring the manufactured concrete or manufactured mortar that is introduced into the hopper. The stirring member is A first rod extending radially from a predetermined portion of the rotating shaft, It comprises a second rod member, one end of which is connected to the tip of the first rod member and the other end of which is connected to the axial end of the rotating shaft, The first rod extends linearly from the axial middle portion of the rotating shaft toward the radial direction of the rotating shaft, The second rod extends in an arc shape from the tip of the first rod toward the axial end of the rotating shaft, The first rod and the second rod define a fan-shaped or quarter-circular opening between them and the rotating shaft, in a radial view of the rotating shaft. The hopper has, in order from the top, a side wall, an inclined wall that is in the shape of an inverted truncated pyramid or an inverted truncated cone and narrows downward from the lower end of the side wall, and a discharge wall that extends downward from the lower end of the inclined wall. As the rotation axis rotates, the second rod rotates while maintaining a predetermined clearance between the rotation trajectory of the second rod and the inner surface of the inclined wall portion. A stirring device characterized by the following features.

2. The stirring member further comprises a third rod extending radially from between the first and second rods of the rotating shaft. The stirring device according to claim 1.

3. The third rod is positioned with respect to the axis of rotation at a rotational phase 90 degrees different from that of the first and second rods. The stirring device according to claim 2.

4. A motor as a power source, The system further comprises a power transmission mechanism that transmits the power of the motor to the rotating shaft. The stirring device according to any one of claims 1 to 3.

5. The power transmission mechanism is A drive sprocket is provided on the output shaft of the motor so as to be rotatable integrally with it, A driven sprocket is provided on the aforementioned rotating shaft so as to be rotatable integrally with it, and is formed to have a larger diameter than the aforementioned drive sprocket, The drive sprocket and the chain belt wrapped around the driven sprocket are The stirring device according to claim 4.

6. The bottom of the hopper is provided with an outlet for discharging the material being stirred inside the hopper. The aforementioned discharge port is provided with a lid member that can open or close the discharge port. The stirring device according to any one of claims 1 to 5.

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