Manufacturing device of fresh concrete and mixer truck

Abstract

To provide a fresh concrete manufacturing device and a mixer truck that can efficiently supply water to the vicinity of the inner bottom wall surface of a rotary drum and make fresh concrete.SOLUTION: A fresh concrete manufacturing device and a mixer truck are composed of a rotating drum with a spiral blade fixed to its inner peripheral wall surface, capable of rotating forward and backward by a drive unit, and a shaft whose tip is attached via shaft attachment means near the approximate center of the inner bottom wall surface of the rotating drum, the shaft attachment means is composed of one flange-shaped attachment member attached approximately to the center of the inner bottom wall surface of the rotating drum, and another flange-shaped attachment member attached to the tip of the shaft, with connecting means interposed to form a gap between the two attachment members, the shaft is formed in a pipe shape, and water can be supplied into the interior space of the rotating drum through the gap.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ready-mixed concrete manufacturing device and a mixer truck that can store ready-mixed concrete materials in a rotating drum and mix them to produce ready-mixed concrete. [Background technology]

[0002] Conventionally, ready-mixed concrete manufacturing equipment places concrete materials and water in a drum, and rotates at least one of the drum or a shaft to agitate the cement, aggregate, water, etc., and produce ready-mixed concrete.

[0003] An example of such a ready-mixed concrete manufacturing device is a kneading device for producing ready-mixed concrete, which includes a rotating drum that rotates by the driving force of a first driving source and has an opening at one end on the upper side and a circumferential barrel portion that is continuous with the bottom wall portion on the lower side, a blade that is spirally fixed to the inner circumferential surface of the rotating drum, a fixed shaft that is installed between a support portion on the bottom wall portion of the rotating drum and a support portion provided outside the rotating drum, a water supply tank that supplies water to be mixed with the mixing materials that have been put into the hollow portion of the rotating drum, a water supply drive source, and a water supply device that includes a water supply pipe, A kneading device for producing ready-mixed concrete is known (Patent Document 1), in which the water supply pipe of the water supply device consists of a first direction water supply pipe that is connected to the water supply drive source and faces the opening of the rotating drum, and a second direction water supply pipe whose connection end is connected to the first direction water supply pipe and is supported by the fixed shaft, with its insertion tip facing near the inner surface of the bottom wall portion, the insertion tip being bent downward and its discharge outlet being located near at least either the inner surface of the bottom wall portion or the lower inner surface of the circumferential drum portion.

[0004] However, in this type of mixing device for producing ready-mixed concrete, the insertion tip is bent downward, which can cause the mixed ready-mixed concrete to flow backward, resulting in blockages or the ready-mixed concrete adhering to the inside of the second-direction water supply pipe. As a result, there is a risk that water cannot be reliably supplied to the vicinity of either the inner surface of the bottom wall or the lower inner surface of the cylindrical portion. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6713145 Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above-mentioned conventional drawbacks, the present invention aims to provide a ready-mixed concrete manufacturing device and a mixer truck that can efficiently supply water near the inner bottom wall surface of a rotating drum and produce ready-mixed concrete.

[0007] The above and other objects and novel features of the present invention will become more fully apparent from the following description read in conjunction with the accompanying drawings.

[0008] However, the drawings are for illustrative purposes only and do not limit the technical scope of the present invention. [Means for solving the problem]

[0009] In order to achieve the above object, the ready-mixed concrete manufacturing apparatus described in claim 1 of the present invention comprises a rotating drum having a spiral blade fixed to its inner peripheral wall surface and capable of rotating forward and reverse by a drive unit, and a shaft whose tip is attached via a shaft attachment means near the approximate center of the inner bottom wall surface of the rotating drum, wherein the shaft attachment means comprises one flange-shaped attachment member provided at the approximate center of the inner bottom wall surface of the rotating drum, another flange-shaped attachment member provided at the tip of the shaft, and connecting means interposed so as to form a gap between the one attachment member and the other attachment member, and wherein the shaft is formed in a pipe shape and water can be supplied into the internal space of the rotating drum through the gap.

[0010] The connection means of the ready-mixed concrete manufacturing apparatus described in claim 2 is characterized by being composed of a bolt and a spacer through which the bolt can pass, which is interposed between the one mounting member and the other mounting member, and which does not hinder the supply of water.

[0011] The ready-mixed concrete manufacturing apparatus according to claim 3 is characterized in that the spacer is formed in a plate shape.

[0012] The mixer truck of the present invention described in claim 4 is a mixer truck equipped with a ready-mixed concrete manufacturing device, the ready-mixed concrete manufacturing device comprising a rotating drum having a spiral blade fixed to its inner peripheral wall surface and capable of being rotated forward and reverse by a drive unit, and a shaft having a tip attached via a shaft attachment means near the approximate center of the inner bottom wall surface of the rotating drum, the shaft attachment means comprising one flange-shaped attachment member provided at the approximate center of the inner bottom wall surface of the rotating drum, another flange-shaped attachment member provided at the tip of the shaft, and connecting means interposed so as to form a gap between the one attachment member and the other attachment member, the shaft being formed in a pipe shape, and water can be supplied from the gap to the internal space of the rotating drum.

[0013] The connection means of the mixer truck described in claim 5 is characterized in that it is composed of a long bolt and a spacer through which the bolt can pass, which is interposed between the one mounting member and the other mounting member, and which does not hinder the supply of water.

[0014] The spacer of the mixer truck according to claim 6 is formed in a plate shape. [Effects of the Invention]

[0015] As is clear from the above description, the present invention provides the following effects. (1) In the inventions described in claims 1, 2, 4, and 5, a gap is formed between one and the other flange-shaped mounting members, and water can be supplied through this gap. Therefore, the flange can prevent the fresh concrete from entering the water supply channel to some extent, preventing the fresh concrete from flowing back, and ensuring that water can be supplied near the inner bottom wall surface of the rotating drum. (2) In addition, by forcibly ejecting water from the gap and causing it to collide with the flange of the other mounting member, water can be supplied to the entire circumferential direction of the rotating drum. (3) The inventions described in claims 3 and 6 also have the same effects as those described in (1) and (2) above, and by using plate-shaped spacers, the spacers can also shear the fresh concrete during mixing. [Brief explanation of the drawings]

[0016] 1 to 7 are explanatory diagrams showing a first embodiment of the present invention. 8 to 12 are explanatory diagrams showing a second embodiment of the present invention. [Figure 1] 1 is a front view of a ready-mixed concrete manufacturing apparatus showing a first embodiment. [Figure 2] 1 is a schematic cross-sectional view of a portion of a ready-mix concrete manufacturing device. [Figure 3] FIG. [Figure 4] Cross-sectional view taken along line 4-4 in Figure 3. [Figure 5] FIG. 1 is an explanatory diagram of a state in which water is supplied to concrete materials. [Figure 6] 1 is a front view of a mixer truck showing a first embodiment. [Figure 7] A schematic cross-sectional view of a part of a mixer truck. [Figure 8] FIG. 4 is a front view of a ready-mixed concrete manufacturing apparatus showing a second embodiment. [Figure 9] 1 is a schematic cross-sectional view of a portion of a ready-mix concrete manufacturing device. [Figure 10] FIG. [Figure 11] Cross-sectional view taken along line 11-11 in Figure 10. [Figure 12] FIG. 10 is a partial schematic cross-sectional view of a mixer truck showing a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings showing preferred embodiments of the present invention.

[0018] In a first embodiment for carrying out the present invention shown in Figures 1 to 7, reference numeral 1 denotes an apparatus for manufacturing ready-mixed concrete of the present invention that can manufacture ready-mixed concrete at the site of use. This apparatus for manufacturing ready-mixed concrete 1 comprises an inclined rotating drum 2 having a spiral blade 3 fixed to its inner peripheral wall surface 2a, a frame 4 that supports the rotating drum 2 in an inclined state and so that it can rotate circumferentially, a drive unit 5 (see Figure 6) installed on the frame 4 so as to rotate the rotating drum 2 forward and backward, and a shaft 7 whose tip end is attached via shaft attachment means 6 to approximately the center of the inner bottom wall surface of the rotating drum 2. Note that the frame 4 is not necessarily required; any support means capable of supporting the rotating drum 2 will suffice. For example, if the rotating drum can be supported by the drive unit 5 alone, then a frame 4 or the like need not be provided.

[0019] This shaft 7 is formed in a pipe shape, the inside of which forms a water supply channel 8, and by injecting water from the rear end on the protruding side, water can be supplied to the internal space of the rotating drum 2 from the front end on the insertion side, which is located near the approximate center of the inner bottom wall surface of the rotating drum 2. This shaft 7 is provided in a supported state near the approximate center of the inner bottom wall surface 2b of the rotating drum 2 via shaft mounting means 6, and its rear end is attached to the frame 4 or the rotating drum 2 near the entrance / exit 2c of the rotating drum 2.

[0020] The center of the bottom wall of the rotating drum 2 is supported by a numbered support and bearing member 21 located between the inner surface of the inclined frame rod and the outer surface of the bottom wall (see, for example, Figures 1 and 6). On the other hand, the open end side of the rotating drum 2 is appropriately supported by, for example, the frame and / or rollers of the drive device 5. The shaft 7 is also arranged so that its central axis is approximately coaxial with the central axis of the rotating drum 2.

[0021] 3, the shaft mounting means 6 is composed of one flange-shaped mounting member 9 (on the right side of the drawing) provided at approximately the center of the inner bottom wall surface 2b of the rotating drum, another flange-shaped mounting member 10 (on the left side of the drawing) provided at the tip of the shaft 7, and connecting means 12 interposed between the one mounting member 9 and the other mounting member 10 to form a gap 11. In addition, by opposing the one mounting member 9 and the other mounting member 10, the required gap 11 is formed. One of the mounting members 9 is fixedly attached to the rotating drum 2 or is attached via a bearing so as to be rotatable relative to the rotating drum 2, and has a bolt hole or a screw hole formed in the flange-shaped portion. In this embodiment, a screw hole is formed, and the threaded portion of the bolt 13 is screwed into this screw hole.

[0022] In this embodiment, the other mounting member 10 is fixedly provided on the tip of the shaft 7 so as to face the one mounting member 9, and has a bolt hole or a screw hole formed in a position facing the bolt hole. The water supply passage 8 passes through the entire shaft 7, and the water supply passage 8 is formed in the center of the other mounting member 10. When the one mounting member 9 is fixedly provided on the rotating drum 2, the other mounting member 10 may be provided on the shaft 7 via a bearing so that the shaft 7 and the other mounting member 10 can rotate relative to each other.

[0023] In this embodiment, the connection means 12 is connected by a plurality of long bolts 13 and a plurality of spacers 14 that can receive the bolts 13, are interposed between the one mounting member 9 and the other mounting member 10, and do not obstruct the supply of water, and a gap 11 is formed between the one mounting member 9 and the other mounting member 10. When water is poured in, the water passes through the water supply channel 8 and is supplied from this gap 11.

[0024] It is desirable that this gap 11 be at least larger than the diameter of the water supply passage 8, and specifically, it should be formed to be about several centimeters to several tens of centimeters, and optimally about 7 cm to 8 cm. By making the gap about 7 cm to 8 cm, the water supply is not hindered and the water can be made to collide with the entire inner surface of one of the mounting members 9, and the collided water can be dispersed all around the inside of the rotating drum 2 (see FIG. 5).

[0025] In this embodiment, the spacer 14 is a pipe through which the bolt 13 passes and which has a diameter larger than the bolt hole, but any spacer may be used as long as it can form a gap and does not hinder the supply of water.

[0026] Alternatively, instead of using spacers 14, fixed convex portions may be formed on at least one of the first mounting member 9 or the second mounting member 10 so as to face each other, forming gap 11, or a stepped bolt may be used in which only the threaded portion is formed so as to be able to pass through the bolt-through hole. In such cases, connection means 12 is composed of only bolts (and nuts). Furthermore, while connection means 12 is preferably one that detachably connects the first mounting member 9 and the second mounting member 10 like a bolt, it may also be possible to connect them fixedly, for example, by adhesive bonding or welding with a gap in between.

[0027] Incidentally, the above description has been given of bolt holes or screw holes formed in the mounting members 9, 10 and bolts passed through or screwed into them, but the connecting means 12 may also be such that, for example, a rod material with a threaded portion is fixed to one mounting member 9 or the other mounting member 10, and a bolt hole or screw hole is formed in only one of the mounting members for connection.

[0028] When water is supplied to the concrete material through this water supply channel 8, as shown in Figure 4, a hose or the like is connected to the rear end of the shaft 7, and water is passed through the hose into the water supply channel 8. In this case, water is forcefully ejected from the gap 11 between one mounting member 9 and the other mounting member 10, allowing water to be efficiently supplied to the concrete material.

[0029] The drive unit 5 is attached to the frame 4, and rotates the rotating drum 2 by the driving force of a hydraulic motor of the drive unit 5. Any drive unit 5 that can rotate the rotating drum 2 may be used, and any known drive unit 5 may be used.

[0030] In this embodiment, the central axis of the shaft 7 and the rotation axis of the rotating drum 2 are substantially coaxial, but the central axis of the shaft 7 and the rotation axis of the rotating drum 2 may be provided eccentrically.

[0031] Furthermore, the mixer truck 15 of the present invention has the ready-mixed concrete manufacturing device 1 mounted on the loading platform 17 of a vehicle 16 such as a truck, and the rotating drum 2 is supported by the loading platform 17 of the vehicle 16 rather than the frame 4. This mixer truck 15 is preferably equipped with a hopper 18 for charging ready-mixed concrete materials, a discharge chute 19 for receiving and discharging the ready-mixed concrete to the outside, a metered mixing water tank 20 with a meter that can supply a measured amount of water into the rotating drum 2, and the like.

[0032] In this mixer vehicle 15, the inner bottom wall surface 2b side of the rotating drum 2 is supported via a bearing member 21, and the entrance / exit 2c side is supported by rollers of the drive unit 5. Furthermore, the rear end portion of the shaft 7 is supported by a support base 22, but the rear end portion of the shaft 7 may also be supported by a hopper 18.

[0033] When producing ready-mixed concrete using the ready-mixed concrete manufacturing apparatus 1 and mixer truck 15 configured as described above, ready-mixed concrete material such as a mixture of sand and gravel, a mixture of sand, gravel, admixtures, etc., or a mixture of these with cement is loaded into the rotating drum 2.

[0034] After the ready-mix concrete materials are poured into the rotating drum 2, a predetermined amount of water measured by a measuring device is supplied into the rotating drum 2 via the water supply line 8. The water supply line 8 allows water to be supplied near the inner bottom wall surface 2b of the rotating drum 2, allowing the concrete materials and water to be mixed efficiently.

[0035] In this state, by rotating the rotating drum 2 with the drive device 5, the ready-mixed concrete material and water in the rotating drum 2 are mixed and moved by the spiral blade 3 toward the inner bottom wall surface 2b of the rotating drum 2.

[0036] As the fresh concrete material moves in this manner toward the inner bottom wall surface 2b of the rotating drum 2, it is separated into left and right parts by the shaft 7, and the fresh concrete material is lifted by the spiral blade 3. As it falls downward, the fresh concrete material is sheared by the shaft 7 and the one and other mounting members 9, 10, and is mixed efficiently.

[0037] Therefore, the ready-mixed concrete material and water can be forcibly mixed to produce ready-mixed concrete in a relatively short time.

[0038] The ready-mixed concrete produced in the rotating drum 2 is carried by the spiral blade 3 toward the entrance / exit 2c of the rotating drum 2 by rotating the rotating drum 2 in reverse on site, and is then discharged to the outside.

[0039] After the ready-mixed concrete is produced in this manner, water can be discharged from the water supply channel 8 to remove the ready-mixed concrete adhering to the vicinity of the gap 11, making post-processing easier.

[0040] [Different modes for carrying out the invention] Next, different embodiments for carrying out the present invention will be described with reference to Figures 8 to 12. In describing these different embodiments for carrying out the present invention, the same components as those in the first embodiment for carrying out the present invention will be designated by the same reference numerals, and redundant description will be omitted.

[0041] The second form for carrying out the present invention shown in Figures 8 to 12 is mainly different from the first form for carrying out the present invention in that, in this embodiment, the spacers 14 are made up of a plurality of plate-shaped spacers 14A, and these spacers 14A are used as shaft mounting means 6A equipped with connection means 12A arranged radially around the central axis of the shaft 7. With such ready-mixed concrete manufacturing apparatus 1A and mixer truck 15A, it is possible to obtain the same effects as those of the first form for carrying out the present invention, and by using such plate-shaped spacers 14A, the spacers 14A shear the ready-mixed concrete during mixing, allowing the ready-mixed concrete to be mixed more efficiently.

[0042] In the embodiment of the present invention, the operation panel has been described as being capable of driving the pump of the metering and kneading water tank and supplying water to the inside of the rotating drum, but it may also be configured to be capable of driving the hydraulic motor of the rotating drum and rotating the rotating drum forward and backward, etc.

[0043] Furthermore, in the embodiment of the present invention, the other end of the shaft is described as being fixed to a frame or the like, but it may be attached to any member that does not rotate in sync with the rotation of the rotating drum (for example, a hopper, etc.). [Industrial Applicability]

[0044] The present invention is used in industries that manufacture ready-mix concrete manufacturing equipment and the like. [Explanation of symbols]

[0045] 1, 1A: ready-mix concrete manufacturing equipment, 2: rotating drum, 3: Blade, 4: Frame, 5: drive unit; 6, 6A: shaft mounting means; 7: shaft; 8: water supply channel; 9: one mounting member; 10: the other mounting member; 11: gap; 12, 12A: connection means; 13: Bolt, 14, 14A: Spacer, 15, 15A: Mixer truck, 16: Vehicle, 17: Loading platform, 18: Hopper, 19: Discharge chute, 20: Measuring and mixing water tank, 21: bearing member, 22: support base.

Claims

1. The rotating drum has a spiral blade fixed to its inner peripheral wall surface and can be rotated forward and backward by a drive unit, and a shaft whose tip is attached to the approximate center of the inner bottom wall surface of the rotating drum via a shaft attachment means. The shaft mounting means is composed of one flange-shaped mounting member provided approximately in the center of the inner bottom wall surface of the rotating drum, the other flange-shaped mounting member provided at the tip of the shaft, and connecting means interposed to form a gap between the one mounting member and the other mounting member, the shaft being formed in a pipe shape, and a ready-mixed concrete manufacturing device that can supply water to the internal space of the rotating drum through the gap.

2. The ready-mixed concrete manufacturing device described in claim 1, characterized in that the connecting means is composed of a bolt and a spacer through which the bolt can pass, which is interposed between the one mounting member and the other mounting member, and which does not hinder the supply of water.

3. 3. The ready-mixed concrete manufacturing apparatus according to claim 2, wherein the spacer is formed in a plate shape.

4. In a mixer truck equipped with ready-mix concrete manufacturing equipment, The ready-mixed concrete manufacturing device is comprised of a rotating drum having a spiral blade fixed to its inner peripheral wall surface and capable of rotating forward and reverse by a drive device, and a shaft whose tip end is attached via a shaft attachment means to the vicinity of the center of the inner bottom wall surface of the rotating drum, The shaft mounting means is composed of one flange-shaped mounting member provided approximately in the center of the inner bottom wall surface of the rotating drum, the other flange-shaped mounting member provided at the tip of the shaft, and connecting means interposed to form a gap between the one mounting member and the other mounting member, and the shaft is formed in a pipe shape, and a mixer truck can supply water from the gap to the internal space of the rotating drum.

5. The mixer truck according to claim 4, characterized in that the connecting means is composed of a bolt and a spacer through which the bolt can pass, which is interposed between the one mounting member and the other mounting member, and which does not hinder the supply of water.

6. The mixer truck according to claim 5, wherein the spacer is formed in a plate shape.

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