Mixer drum and mixer wheel

Abstract

To provide a mixer drum with high maintainability and a mixer vehicle equipped with that mixer drum. [Solution] The mixer drum of the present invention is a mixer drum mounted on a mixer wheel, wherein a woven layer made of thermoplastic resin fibers is fixed to the inner wall surface of the metal outer casing of the mixer drum via an elastomer adhesive layer.

Description

Technical Field

[0001] The present invention relates to a mixer drum mounted on a mixer truck and a mixer truck equipped with the same.

Background Art

[0002] The mixer drum of a concrete mixer truck is for loading and transporting fresh concrete, so concrete easily adheres to the inner wall surface. The adhered concrete is indispensable for chipping work, and the work burden is great. Conventionally, in a mixer drum, there has been a demand for a device that makes it difficult for concrete to adhere.

[0003] In the prior art described in Patent Document 1, for preventing the adhesion of concrete, a method of fixing a lining sheet made of soft rubber or soft plastic to the inner wall surface of the mixer drum is described. Regarding the fixing method of the lining sheet, if the mixer drum is made of a steel plate, it may be adhered using an appropriate adhesive. Also, for reinforcing the lining sheet, it is stated that a reinforcing cloth, steel material, or steel wire mesh may be encapsulated. The lining sheet, which is the prior art described in Patent Document 1, is made of soft rubber or soft plastic, so there is a need for periodic replacement work. When detaching the used lining sheet from the inner wall surface of the mixer drum, whether or not a reinforcing material is encapsulated in the lining sheet, the lining sheet and the adhesive tend to remain partially on the inner wall surface. The work of detaching the remaining lining sheet and adhesive is also time-consuming, and there is also a possibility of damaging the inner wall surface during detachment. The lining sheet with a reinforcing cloth as a reinforcing material has the drawback that although the detachment of the reinforcing cloth is relatively easy during detachment, the soft rubber or soft plastic component between the reinforcing cloth and the drum inner wall surface tends to remain. The lining sheet with steel material or steel wire mesh as a reinforcing material is relatively hard, and there is also a problem that it is difficult to handle when detaching the lining sheet from the inner wall surface. In any case, the lining sheet, which is the prior art described in Patent Document 1, is inferior in maintainability and cannot withstand long-term use.

Prior Art Documents

[0004] [Patent Document 1] Actual publication No. 59-038011 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] This invention was made in view of the above-mentioned problems, and aims to provide a mixer drum with high maintainability and a mixer vehicle equipped with the mixer drum. [Means for solving the problem]

[0006] To achieve the above objective, the gist of the present invention is a mixer drum mounted on a mixer wheel, characterized in that a woven layer made of thermoplastic resin fibers is fixed to the inner wall surface of the metal outer casing of the mixer drum via an elastomer adhesive layer.

[0007] To achieve the above objective, a second aspect of the present invention is a mixer truck equipped with a mixer drum, characterized in that a woven layer made of thermoplastic resin fibers is fixed to the inner wall surface of the metal outer casing of the mixer drum via an elastomer adhesive layer.

[0008] According to the present invention, it is possible to provide a mixer drum with high maintainability and a mixer vehicle equipped with the mixer drum. [Brief explanation of the drawing]

[0009] [Figure 1] This is an enlarged cross-sectional view of the outer casing 15 of a mixer drum according to an embodiment of the present invention. [Figure 2] This is a schematic side view of a mixer car 100 equipped with a mixer drum 1 according to an embodiment of the present invention. [Figure 3]This is a schematic diagram showing the internal structure of a mixer drum 1 according to an embodiment of the present invention, with the structure visible through the outer casing. [Figure 4] Figure 4(a) is a schematic diagram showing a plain weave pattern of a woven layer according to an embodiment of the present invention, and Figure 4(b) is a cross-sectional view of Figure 4(a) taken from direction AA. [Figure 5] Figure 5(a) is a schematic diagram showing the twill weave pattern of a fabric layer according to an embodiment of the present invention, and Figure 5(b) is a cross-sectional view of Figure 5(a) from the BB direction. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, identical or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic. Therefore, specific sizes, configurations, materials, etc. should be determined more broadly by considering the essence of the technical idea that can be understood from the following description.

[0011] Furthermore, the embodiments of the present invention described below are illustrative examples of devices and materials for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not limit the materials, shapes, structures, arrangements, etc., of the devices and materials to those described below. The technical idea of ​​the present invention is not limited to the contents described in the embodiments of the present invention, and various modifications can be made within the technical scope defined by the organic combination of the inventive features described in the claims.

[0012] (Embodiment) The mixer drum according to an embodiment of the present invention is a mixer drum 1 mounted on a mixer wheel 100 as shown in Figure 2, wherein, as shown in Figure 1, a woven fabric layer 11 made of thermoplastic resin fibers is fixed to the inner wall surface of the metal outer casing 15 of the mixer drum via an elastomer adhesive layer 13. When the woven fabric layer 11 shown in Figure 1 is plain weave, it is preferable that the number of warp threads per inch of the woven fabric layer 11 is 35 to 100 threads / inch and the number of weft threads per inch of the woven fabric layer 11 is 10 to 20 threads / inch. On the other hand, when the woven fabric layer 11 shown in Figure 1 is twill weave, it is preferable that the number of warp threads per inch of the woven fabric layer 11 is 10 to 20 threads / inch and the number of weft threads per inch of the woven fabric layer 11 is 5 to 10 threads / inch.

[0013] As shown in Figure 2, the mixer drum 1 according to this embodiment is installed on the base 7 of the vehicle body 8 of the mixer truck 100, and is connected to a rotating shaft 2 driven by a rotary drive device 3. The mixer drum 1 rotates in conjunction with the rotation of the rotating shaft 2. Ready-mix concrete is poured from the hopper 4 into the mixer drum 1. When using the ready-mix concrete in the mixer drum 1, the ready-mix concrete discharged from the mixer drum 1 is received by the scoop 5 and guided to the formwork at the construction site via a chute 6, which acts as a trough. Regarding the structure of the mixer truck 100 other than the mixer drum 1 according to this embodiment of the present invention, it is possible to use parts that are normally used in concrete mixer trucks.

[0014] As shown in Figure 3, the mixer drum 1 according to this embodiment includes a first blade 9 and a second blade 10 as its internal structure. For the first blade 9 and the second blade 10, a double blade similar to that of a normal concrete mixer truck can be used. In a normal concrete mixer truck, the internal structure of the mixer drum uses a double blade, similar to the internal structure of the mixer drum 1 according to this embodiment shown in Figure 3, to mix and discharge the ready-mix concrete. In the mixer drum 1 according to this embodiment, as shown in Figure 1, the woven fabric layer 11 is fixed to the inner wall surface of the outer casing 15 via an elastomer adhesive layer 13. However, it is preferable not to provide a woven fabric layer on the first blade 9 and the second blade 10 of the internal structure, as this would increase friction with the ready-mix concrete too much.

[0015] The material of the outer casing 15 according to the embodiment shown in Figure 1 can be any metal, and it is possible to use the same material as a normal concrete mixer truck. The outer casing 15 may be made of iron plate or steel plate. If the outer casing 15 is made of steel plate, the thickness can be any degree, and it may be a thin plate, medium plate, thick plate or extra-thick plate. If the outer casing 15 is made of steel plate, it may be carbon steel or special steel with added nickel-chromium, or it may be a steel plate other than those. High-tensile steel plate can be used as the outer casing 15. There are no limitations on the external shape or internal wall shape of the outer casing 15, and the shape of the outer casing of a mixer drum used in a normal concrete mixer truck can be adopted.

[0016] The woven fabric layer 11 according to the embodiment shown in Figure 1 is made of a woven fabric made of thermoplastic resin fibers. Examples of thermoplastic resin fibers that constitute the woven fabric layer 11 according to the embodiment include polyester resin fibers such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; aliphatic polyamide resins such as nylon; aromatic polyamide resins such as paraphenylenediamine and terephthalic acid polymers; vinyl resins such as hydrophobic polyvinyl alcohol resins; and polyolefin resins such as polyethylene resin, polypropylene resin, and polybutadiene resin. Only one of these thermoplastic resin fibers may be used as the woven fabric layer 11 according to the embodiment, or two or more may be used in combination. From the viewpoint of strength, polyester resin fibers and polypropylene resin fibers are preferred as the thermoplastic resin fibers that constitute the woven fabric layer 11 according to the embodiment. The woven fabric layer 11 according to the embodiment is preferably about 1.0 to 3.0 mm thick, and any thickness is acceptable as long as it satisfies a safe load of 250 to 650 kg. The fineness of the warp threads, which are constituent yarns of the thermoplastic resin fibers constituting the woven layer 11 according to this embodiment, is preferably 500 to 3000 decitex, and particularly preferably 1500 to 1800 decitex from the viewpoint of strength, and the fineness of the weft threads is preferably 250 to 1500 decitex, and particularly preferably 500 to 1000 decitex from the viewpoint of strength.

[0017] The form of the constituent yarn of the thermoplastic resin fibers constituting the woven layer 11 according to the embodiment is not limited and may be long fibers or short fibers, and may be monofilament or multifilament. Furthermore, if it is multifilament, it may be a plied yarn or a twisted yarn (paired yarn, interwoven yarn, etc.). The thickness of the constituent yarn of the thermoplastic resin fibers constituting the woven layer 11 according to the embodiment is preferably about 0.1 to 1.0 mm. When the constituent yarn of the thermoplastic resin fibers constituting the woven layer 11 according to the embodiment is multifilament, the number of filaments constituting the multifilament is not particularly limited and can be set according to its fineness, etc., but in the case of warp threads, 45 to 300 threads are preferred, and particularly 100 to 200 threads are preferred from the viewpoint of strength, and in the case of weft threads, 20 to 200 threads are preferred, and particularly 45 to 130 threads are preferred from the viewpoint of strength. The constituent yarn of the thermoplastic resin fibers constituting the woven layer 11 according to the embodiment may contain components other than resin as needed. That is, examples include inorganic fillers, organic fillers, colorants, plasticizers, antioxidants, anti-aging agents, etc. These may contain only one type, or two or more types.

[0018] If the fabric layer 11 according to the embodiment shown in Figure 1 is a plain weave as shown in Figures 4(a) and 4(b), then from the standpoint of strength, it is preferable that the number of warp threads per inch is 35 to 100 and the number of weft threads per inch is 10 to 20. In Figure 4(a), the warp and weft threads of the plain weave fabric layer 11 according to the embodiment are shown as 15 warp threads 11A and 15 weft threads 11B, but it is assumed that the warp and weft threads of the fabric layer 11 continue in a continuous line in the left, right, up, and down directions even outside the area shown in Figure 4(a). Also, in Figures 4(a) and 4(b), only one of the five warp threads is labeled "11A1", but the remaining four warp threads, for which the label is omitted, are also "11A1", and the other warp threads assumed to exist outside the area shown are also "11A1". Similarly, in Figures 4(a) and 4(b), only one of the five weft threads is labeled "11B1," but the remaining four weft threads, whose labels are omitted, are also "11B1," and any other weft threads that are not shown are also assumed to be "11B1."

[0019] On the one hand, when the fabric layer 11 according to the embodiment shown in FIG. 1 is a twill weave as shown in FIGS. 5(a) and 5(b), from the perspective of strength, the number of warp yarns driven in is preferably 10 to 20 per inch, and the number of weft yarns driven in is preferably 5 to 10 per inch. In FIG. 5(a), the warp and weft yarns of the fabric layer 11 of the twill weave pattern according to the embodiment are illustrated with 26 warp yarns 11A and 26 weft yarns 11B. However, it is assumed that the warp and weft yarns of the fabric layer 11 continue continuously in the left-right and up-down directions even outside the illustration in FIG. 5(a). Also, in FIGS. 5(a) and 5(b), only one of the six warp yarns is illustrated with the symbol "11A2", but the remaining five warp yarns with the symbol omitted are also "11A2", and the other warp yarns assumed to exist outside the illustration are similarly "11A2". Similarly, in FIGS. 5(a) and 5(b), only one of the six weft yarns is illustrated with the symbol "11B2", but the remaining five weft yarns with the symbol omitted are also "11B2", and the other weft yarns assumed to exist outside the illustration are similarly "11B2".

[0020] The fabric layer 11 according to the embodiment shown in FIG. 1 can also be configured other than plain weave and twill weave. For example, as the fabric layer 11 according to the embodiment, various weaving methods such as damask weave, sacking weave, sheet weave, and twill weave can be adopted. Also, as the fabric layer 11 according to the embodiment, a fabric in which a plurality of different weaving methods are mixed can also be adopted.

[0021] The overall shape of the fabric layer 11 before being attached to the outer shell 15 is not limited, but for convenience during maintenance, a sheet shape, a roll shape, a belt shape, etc. can be adopted. As the fabric layer 11 according to the embodiment, a narrow-width fabric which is a belt-shaped fabric with a width of less than 13 cm can also be adopted. When the fabric layer 11 before being attached to the outer shell 15 is formed into a roll shape or a belt shape, it is preferable that its longitudinal direction is aligned with the warp direction of the fabric layer 11. During maintenance, when peeling off the fabric layer 11, it will be peeled off along the longitudinal direction of the roll shape or the belt shape, but it will be peeled off along the warp direction of the fabric layer 11, so that the detachment of the fabric layer 11 can be performed smoothly.

[0022] In the fabric layer 11 according to the embodiment, when the surface fixed to the inner wall surface of the outer shell 15 of the mixing drum 1 is used as the adhesive surface and the other surface is used as the exposed surface, fine unevenness derived from the fabric exists on the entire adhesive surface and the exposed surface. The unevenness on the entire exposed surface of the fabric layer 11 according to the embodiment has the effect of preventing the adhesion of contents such as fresh concrete, and the unevenness on the entire adhesive surface of the fabric layer 11 is related to the adhesive strength with the adhesive layer 13.

[0023] In the fabric layer 11 according to the embodiment shown in FIG. 1, as the reinforcing material, a plurality of or single blade made of polyester, PET, nylon (registered trademark) or aramid fiber, monofilament made of olefin resin, polyester resin, etc., multifilament knitted from thin monofilament, flat yarn made of tape-like yarn, metal wire made of stainless steel, steel, etc. or coil made of hard material similar to stainless steel, piano wire, and combinations thereof can be adopted.

[0024] Regarding the adhesive layer 13 according to the embodiment shown in FIG. 1, any material may be used as long as it can adhere the fabric made of thermoplastic resin fiber and the metal. The adhesive layer 13 according to the embodiment is preferably an adhesive layer made of an elastomer-based adhesive, and from the aspect of adhesion and detachment, an adhesive layer made of a chloroprene rubber-based adhesive is preferable.

[0025] As shown in FIG. 1, the mixing drum according to the embodiment has the inner wall surface of the outer shell 15 covered with the fabric layer 11 made of thermoplastic resin fiber, so that the metal outer shell 15 can be protected from the friction of contents such as fresh concrete. The fabric layer 11 according to the embodiment can also withstand the friction during the stirring of fresh concrete. It is known that the stirring speed of fresh concrete is generally about 13 revolutions per minute when producing fresh concrete and about 1.5 revolutions per minute when preventing the separation of the produced fresh concrete. However, during any stirring, the fabric layer 11 according to the embodiment shown in FIG. 1 will not be peeled off due to the friction with fresh concrete.

[0026] As shown in Figure 1, the mixer drum according to this embodiment has an inner wall surface of the outer casing 15 covered with a woven fabric layer 11 made of thermoplastic resin fibers, which has the effect of preventing concrete from hardening. Even if there are hardened concrete sections, less water is needed to remove the concrete, which has the advantage of allowing the chipping work to be completed more quickly.

[0027] The mixer drum according to this embodiment requires periodic maintenance work to remove the woven fabric layer 11 made of thermoplastic resin fibers shown in Figure 1 and attach a new woven fabric layer 11. However, since the detachment and attachment of the woven fabric layer 11 are easy, the maintainability is good. Because the woven fabric layer 11 is made of a woven fabric made of thermoplastic resin fibers, the woven fabric layer 11 is relatively easy to peel off regardless of the direction from which force is applied. In addition, because there are irregularities on the entire adhesive surface of the woven fabric layer 11, the contact area between the woven fabric layer 11 and the adhesive layer 13 is large, resulting in high adhesive strength. When the woven fabric layer 11 is peeled off from the outer casing 15, the adhesive layer 13 adheres to the woven fabric layer 11 and peels off at the same time, leaving almost no adhesive layer 13 on the outer casing 15. When attaching the woven fabric layer 11 to the outer casing 15, the attachment process is simple: after applying the adhesive that will form the adhesive layer 13 to the outer casing 15, the woven fabric layer 11, which is molded into a sheet, roll, or belt shape, is attached to the inner wall surface of the outer casing 15, avoiding the first blade 9 and second blade 10 shown in Figure 3. In particular, if the woven fabric layer 11 is molded into a roll or belt shape, it can be attached to the inner wall surface of the outer casing 15 in a spiral pattern from the edge, avoiding the first blade 9 and second blade 10 shown in Figure 3.

[0028] In this embodiment, the mixer drum has an inner wall surface of the outer casing 15 covered with a woven fabric layer 11, thus providing a heat shielding effect from the outside air. Both low winter temperatures and high summer temperatures are major enemies of ready-mixed concrete. By using the mixer drum according to this embodiment, it is possible to shield against low winter temperatures and high summer temperatures, making it possible to transport ready-mixed concrete to its destination while maintaining a stable quality regardless of the season.

[0029] The fabric layer 11 according to this embodiment can be manufactured using a general fabric manufacturing method. For example, the fabric layer 11 can be manufactured by inserting a weft thread between the warp threads from one side using a needle loom or the like.

[0030] As the woven fabric layer 11 according to this embodiment, for example, a belt material such as a seat belt, lashing belt, Danline belt, or sling belt can be used. A seat belt or Danline belt handled by a materials sales company such as Taniguchi Sangyo Co., Ltd. can be obtained, cut to an appropriate size, and used. As the adhesive layer 13 according to this embodiment, for example, chloroprene rubber Bond G17Z (manufactured by Konishi Corporation), a solvent-based adhesive, can be used.

[0031] (Other embodiments) As described above, the present invention has been described by the embodiments described above, but the descriptions and drawings that constitute part of this disclosure should not be understood as limiting the invention. Various alternative embodiments, examples and operational techniques will become apparent to those skilled in the art from this disclosure.

[0032] For example, although the present invention was applied to the inner wall surface of a mixer drum, it can also be applied to other parts where fresh concrete may adhere, such as the hopper 4, scoop 5, and chute 6 shown in Figure 2.

[0033] Thus, it goes without saying that the present invention includes various embodiments and the like that are not described herein. Therefore, the technical scope of the present invention is defined solely by the inventive features in the claims, which can be reasonably interpreted from the above description. [Explanation of symbols]

[0034] 1…Mixer drum, 2…Rotating shaft, 3…Rotating drive mechanism, 4…Hopper, 5…Scoop, 6…Cute, 7…Base, 8…Body, 9…First blade, 10…Second blade, 11…Fabric layer, 13…Adhesive layer, 15…Outer shell, 100…Mixer car

Claims

1. This is a mixer drum installed in a mixer car. A mixer drum characterized in that a woven layer made of thermoplastic resin fibers is fixed to the inner wall surface of the metal outer casing of the mixer drum via a chloroprene rubber-based adhesive layer.

2. The aforementioned woven layer is plain weave, The number of warp threads in the aforementioned fabric layer is 35 to 100 threads / inch. The number of weft threads in the aforementioned woven layer is 10 to 20 threads / inch The mixer drum according to claim 1, characterized in that it is the same as the one described in claim 1.

3. The aforementioned fabric layer is a twill weave, The number of warp threads in the aforementioned woven layer is 10 to 20 threads / inch. The number of weft threads in the aforementioned woven layer is 5 to 10 threads / inch The mixer drum according to claim 1, characterized in that it is the same as the one described in claim 1.

4. A mixer drum mounted on a mixer truck, wherein a woven layer made of thermoplastic resin fibers is fixed to the inner wall surface of the metal outer casing of the mixer drum via a chloroprene rubber-based adhesive layer. A mixer car characterized by being equipped with [a specific feature].

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