JP2014094367A - Continuous type mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous mixer that is preferable in terms of maintenance and product quality by suppressing adhesion and growth of materials on the inner wall surface of a mixing tank.
A mixing tank of a continuous mixer 1 is a cylindrical drum 3 and is supported on a machine base 2 so as to be freely rotatable. In addition, scrapers 19 and 19 ′ are provided in the upper part of the drum 3 so as to be in sliding contact with the drum inner wall surface 3 a over the entire length of the drum 3. The adhering material adhering to the drum inner wall surface 3a due to the mixing process is moved to the upper part of the drum 3 as the drum 3 rotates, while being scraped by the scrapers 19 and 19 'disposed at the upper part of the drum 3. It is configured to peel off.
[Selection] Figure 1

Description

  The present invention relates to a continuous mixer used for mixing various materials, for example, mixing appropriate solidifying materials and additives with mud or fly ash.

  Conventionally, for example, a continuous mixer has been used to add a predetermined amount of a suitable solidifying material, additive, or the like to a material such as mud or fly ash and perform a mixing process. As shown in Patent Document 1 (Japanese Patent Laid-Open No. 2000-202266), the continuous mixer includes a mixing tank having an input port at one end and a discharge port at the other end. Has a pair of mixing shafts rotating in the opposite direction in parallel, and a plurality of mixing members are provided around the mixing shaft in a spiral shape, and charged into the mixing tank through the charging port. While the materials to be fed are sequentially sent to the outlet side as the mixing shafts rotate, they can be continuously mixed together with appropriate solidifying materials, additives, and the like that are added simultaneously.

JP 2000-202266 A

  By the way, many of the materials to be mixed by the continuous mixer originally have adhesiveness, and many of them have strong adhesiveness by adding and mixing solidifying materials and additives. Therefore, when such a material is mixed with a continuous mixer, it is inevitable that a certain amount of material adheres to the inner wall surface of the mixing tank. However, if this material grows and solidifies beyond a certain level, for example, mixing If the rotation of the member is hindered or the solidified adhering material is peeled off and mixed into the mixed material, there is a concern that mixing unevenness may occur and the quality of the product may be reduced. Therefore, maintenance work such as periodic peeling and removal of the adhering material is required, but such work is very troublesome and time consuming, and there is a disadvantage that mixing processing can not be done during work, There is a need for a mixer device that can suppress adhesion and growth of materials on the inner wall surface of the mixing tank as much as possible, facilitate maintenance, and maintain good quality of products obtained by the mixing process.

  This invention makes it a subject to suppress the adhesion growth of the material to a mixing tank inner wall surface in view of said point, and to provide a continuous mixer preferable in terms of a maintenance surface or the quality of a product.

  In order to solve the above-mentioned problem, in the continuous mixer according to claim 1 according to the present invention, the mixing shaft is passed through a mixing tank having an input port at one end and a discharge port at the other end. A plurality of mixing members are spirally provided around the mixing shaft, and the adhering material charged into the mixing tank from the charging port is disposed on the discharge port side as the mixing shaft rotates. A continuous mixer that performs continuous mixing while sequentially feeding, and rotatably supports the mixing tank as a cylindrical drum, and is in sliding contact with the inner wall surface of the drum over the entire length of the drum. Thus, the scraper is provided, and the adhering material adhering to the inner wall surface of the drum is moved to the drum upper portion side with the rotation of the drum and peeled and removed by the scraper.

  Further, in the continuous mixer according to claim 2, the mixing shaft is a pair of mixing shafts parallel to the drum rotation axis and rotating in a reciprocal direction, and rotation on the mixing shaft side rotating in the same direction as the drum rotation direction. The speed of the mixing shaft rotating in the opposite direction with respect to the speed is increased so that the material in the drum is prevented from being biased toward one mixing shaft as the drum rotates. It is said.

  According to the continuous mixer according to the first aspect of the present invention, the mixing tank of the continuous mixer is rotatably supported as a cylindrical drum, and the drum inner wall surface extends over the entire length of the drum in the upper portion of the drum. Since the scraper is provided so as to be in sliding contact, the adhering material adhering to the inner wall surface of the drum is moved to the drum upper part side as the drum rotates, and the scraper located at the drum upper part is peeled and removed. Even if material adheres to the inner wall surface of the drum, which is a mixing tank, it can be immediately removed by a scraper, effectively preventing growth of the adhering material, facilitating maintenance, and mixing of adhering material. It can also be expected that the mixing unevenness caused by the above can be suppressed and the quality of the product can be maintained well.

  According to the continuous mixer of claim 2, the mixing shaft is a pair of mixing shafts that are parallel to the drum rotation axis and that rotate in the opposite direction, and the mixing shaft that rotates in the same direction as the drum rotation direction. Control so that the rotation speed of the mixing shaft rotating in the opposite direction is higher than the rotation speed so that the material in the drum is not biased to one mixing shaft side as the drum rotates. Therefore, it is possible to reduce the material that is biased and stays on the inner wall surface on one side of the drum, thereby reducing the chance of material adhesion to the inner wall surface of the drum and suppressing the growth of adhesion. In addition, most of the material charged into the drum can be retained in the mixing area at the lower part of the drum, and an effective mixing process is possible.

1 is a partially cutaway front view showing an embodiment of a continuous mixer according to the present invention. It is a partially cutaway top view of FIG. It is AA sectional drawing which abbreviate | omitted one part of FIG. It is a figure equivalent to FIG. 1 of another Example. It is a figure corresponded in FIG. 2 of another Example. It is a figure equivalent to FIG. 3 of another Example.

  In the continuous mixer according to the present invention, a mixing tank is constituted by a cylindrical drum having an inlet at one end and an outlet at the other end, and the drum is rotatably supported. The drum is provided with a pair of mixing shafts that are parallel to the rotation axis and rotate in opposite directions, and a plurality of mixing members are provided around the mixing shaft in a spiral shape. The material fed into the drum from the mouth is continuously mixed while being sequentially fed to the outlet side as each mixing shaft rotates. In addition, a scraper is provided in an upper portion of the drum so as to be in sliding contact with the inner wall surface of the drum over the entire length of the drum.

  For example, when the adhering material is mixed in the continuous mixer having the above-described configuration, the material is charged into the drum from the charging port at one end of the drum while rotating the drum and the mixing shaft. The material thrown into the drum is continuously fed with a solidifying material, an additive, and the like added in the middle while being sequentially sent to the discharge port side of the other end of the drum as each mixing shaft rotates. At this time, the material may adhere to the inner wall surface of the lower part or the side part of the drum, which is a mixing region, during the mixing process. While it is moved to the part side, it is forcibly separated from the inner wall surface by being scraped immediately by a scraper previously arranged on the upper part side of the drum, and dropped to the mixing area at the lower part of the drum and again. It is mixed with other mixed materials.

  In this way, even when material adheres to the inner wall surface of the drum, which is a mixing tank, when the adhering material is mixed, it can be removed and removed immediately with a scraper in a soft state before solidification etc. begins. The material can be mixed with the mixed material, and the growth and solidification of the material adhering to the inner wall of the drum can be effectively suppressed, and the mixing performance of the mixer can be maintained stably, while adhering to the inner wall of the drum. Then, it can be expected that mixing unevenness caused by adhering the adhering material that has been solidified after a certain amount of time to be mixed into the mixed material can be suppressed, and the quality of the product can be maintained favorably. Also, when maintenance is performed by cleaning the inside of the drum after the mixing process, there is not much material remaining on the drum inner wall surface, so maintenance can be performed relatively easily and in a short time. Is preferred.

  Further, of the two mixing shafts, control is performed so that the rotation speed on the mixing shaft side rotating in the opposite direction is somewhat faster than the rotation speed on the mixing shaft side rotating in the same direction as the drum rotation direction. doing. By adopting such rotation control, the material that tends to stay on the inner wall surface of the drum on the side of one mixing shaft as the drum rotates can be reduced, thereby reducing the chance of material adhering to the inner wall surface of the drum. In this way, it is possible to suppress adhesion growth, and much of the material can be retained in the mixing region at the lower part of the drum, so that an effective mixing process is possible.

  An embodiment of the present invention will be described below with reference to FIGS.

  Reference numeral 1 in the figure denotes a continuous mixer that adds a solidifying material, an additive, or the like to a material such as mud or fly ash and performs a mixing process. A cylindrical drum 3 as a mixing tank is provided on the machine base 2. A pair of mixing shafts 4a and 4b, which are rotatably and substantially horizontally supported and rotate in the opposite direction in parallel with the drum rotation shaft, pass through the both ends of the mixing shafts 4a and 4b. The shaft is supported by a bearing 5 erected on the machine base 2.

  A plurality of blade-shaped mixing members 6 are provided around the mixing shafts 4a and 4b in a double spiral shape, and the material put into the drum 3 is rotated by the mixing shafts 4a and 4b. Accordingly, the mixing process can be continuously performed while sequentially feeding the drum 3 to the discharge port side. Further, tuning gears 7a and 7b are fixedly engaged with one end of the mixing shafts 4a and 4b, and rotate in the opposite direction while synchronizing the mixing shafts 4a and 4b as shown by arrows in FIG. In addition, a sprocket 8 is mounted as a rotation transmission mechanism on one mixing shaft 4b, and the sprocket 8 and the sprocket 10 of the drive motor 9 installed on the machine base 2 are connected by a chain 11. The mixing shafts 4a and 4b are rotated at a predetermined speed by driving the drive motor 9.

  An inlet 12 is opened at one end of the drum 3 that is a mixing tank, and an outlet 13 is opened at the other end. The inlet 12 is provided with an inlet chute 14 for charging material. A dam plate 15 having a predetermined height is provided around the periphery of the inlet 12 so as to prevent the input material from flowing back and overflowing to the peripheral part on the inlet 12 side. Yes. If a dam plate similar to the dam plate 15 is provided around the periphery of the discharge port 13, the discharge of the material is blocked to some extent and the material is kept in the drum 3 appropriately. In this way, it becomes possible to further effectively mix the materials on the mixing shafts 4a and 4b.

  In addition, a pair of tire rollers 16 is provided around the outer periphery of the drum 3, and the tire rollers 16 are rotatably supported by a plurality of support rollers 17 that are pivotally supported on the machine base 2. The drive motor 18 rotates the drum 3 in the direction of the arrow in FIG.

  In addition, a scraper 19 is provided at an upper portion in the drum 3 so as to be in sliding contact with the inner wall surface of the drum 3 over substantially the entire length of the drum 3. The scraper 19 is fixed at both ends of a shaft 20 penetrating through the drum 3 to a pedestal 21 erected on the machine base 2, while the shaft 20 is connected to the entire length of the drum 3 via an arm 22. A scraping plate 23 having a length of about is fixed, and as shown in FIG. 3, the tip edge portion of the scraping plate 23 is brought into contact with the drum inner wall surface 3a at a predetermined angle, so that the drum 3 The scraping plate 23 and the drum inner wall surface 3a are in sliding contact with each other.

  Note that the scraper provided in the drum 3 is not necessarily limited to the one having the above-described configuration. For example, a rotary brush type employed in Example 2 or a vibration system called a beater cleaner is used. The thing of various structures, such as a thing, is employable.

  In addition, an addition nozzle 24 for adding a predetermined amount of a solidifying material, an additive, or the like according to the type or property of the material toward the material in the drum 3 is added near the inlet 12 of the drum 3. I have.

  When the continuous mixer 1 having the above-described structure is used to mix materials having adhesion properties such as mud and fly ash, first, the drive motors 9 and 18 are driven, and the mixing shafts 4a and 4b and the drums are driven. 3 are each rotated at a predetermined speed. Next, the material is charged into the drum 3 from the charging chute 14 at one end of the drum 3. The material charged into the drum 3 is sequentially fed from the inlet 12 side of one end of the drum 3 toward the outlet 13 of the other end as the mixing shafts 4a and 4b rotate, and the addition nozzle 24 is added. The mixture is agitated and mixed with a predetermined amount of solidifying material, additive, and the like added by spraying.

  At this time, there is a case where material adheres to the drum inner wall surface 3a in the lower part of the drum 3 or the side part which is a mixing region in the mixing process, but the material adhered to the drum inner wall surface 3a does not stay in one place. As the drum 3 rotates, the drum 3 is moved upward. On the other hand, the scraper plate 23 of the scraper 19 is disposed on the drum 3 upper part side so as to be in sliding contact with the drum inner wall surface 3 a, and the adhering material moved to the drum 3 upper part side is disposed on the scraper 19. It is peeled off and removed from the drum inner wall surface 3a by being scraped one after another by the scraping plate 23. The adhering material peeled and removed from the drum inner wall surface 3a falls to the mixing region below the drum 3, and is again mixed with other mixed materials. The attached material that is forcibly peeled and removed from the drum inner wall surface 3a by the scraper 19 and mixed with the other mixed materials is a soft property that has not yet proceeded to solidify immediately after the attachment. Has little impact on quality.

  As described above, when the adhering material is mixed by the continuous mixer 1 having the above-described configuration, the material adhering occurs at the lower portion of the drum 3 which is the mixing region or the drum inner wall surface 3a in the side portion. However, the drum 3 is moved to the upper part side of the drum 3 as the drum 3 rotates without staying in one place, and the adhered material that has moved is immediately scraped off by the scraper 19 waiting on the upper part side of the drum 3 and forced. Therefore, it can be peeled off and mixed again with another mixed material, and the growth and solidification of the adhering material on the drum inner wall surface 3a can be effectively suppressed and the maintenance becomes easy. At this time, the material adhering to the drum inner wall surface 3a is peeled and removed immediately by the scraper 19 in a relatively soft state in which solidification has not yet started or has not progressed. It is suitable because it can be peeled off and has little peeling residue. In addition, it is possible to prevent the adhering material that has been solidified after a certain amount of time from adhering from being mixed into the mixed material, which is preferable in terms of product quality.

  FIGS. 4 to 6 show a continuous mixer according to the second embodiment of the present invention. The same reference numerals are given to the same components as those of the first embodiment shown in FIGS. A description thereof will be omitted.

  In the continuous mixer of the present embodiment, a rotary brush-shaped scraper 19 'is employed instead of the plate-shaped scraper as in the first embodiment. The scraper 19 ′ is rotatably supported at both ends of a rotary shaft 25 penetrating the drum 3 by a bearing 26 on a stand 21 erected on the machine base 2, while one end of the rotary shaft 25 is supported. A sprocket 27 is attached to the part and connected to a sprocket of a drive motor (not shown) by a chain 28, and is rotated at a predetermined speed by the drive motor. In addition, a large number of scraping brushes 29 are provided around the rotary shaft 25, and the tip of the brush 29 repeatedly slides on the drum inner wall surface 3a as the rotary shaft 25 rotates. The material attached to the drum inner wall surface 3a can be peeled and removed.

  Further, around the pair of mixing shafts 4a and 4b penetrating into the drum 3 which is a mixing tank, a substantially rod-shaped mixing member 6 ′ is wound in a double spiral shape instead of the blade-shaped mixing member. In addition, the mixing member 6 'of each mixing shaft 4a, 4b is arranged to rotate by passing between the mixing members 6' of the other mixing shaft 4a, 4b. Each mixing shaft 4a, 4b can freely rotate at an appropriate rotation speed, and self that scrapes and removes materials adhering to the surface of each mixing shaft 4a, 4b and mixing member 6 'during rotation. A cleaning effect can also be expected.

  Even when the blade-shaped mixing member as in the first embodiment is employed, by adjusting the arrangement and the number of the mixing members with respect to the mixing shafts 4a and 4b (for example, a double spiral shape) (Such as a single spiral), it is possible to avoid collision between the mixing members of the mixing shafts 4a and 4b, thereby freeing the rotational speed of the mixing shafts 4a and 4b to some extent. It is also possible to set. In addition, the number of mixing shafts can be one, and in this case, the rotation speed can be freely set. At this time, by making the rotation direction of the mixing shaft opposite to the rotation direction of the drum 3 (the same rotation direction as that of the mixing shaft 4b), it is possible to suppress the material bias in the drum 3.

  Further, tuning gears 7a 'and 7b' are fixedly engaged with one end portions of the mixing shafts 4a and 4b, respectively. The tuning gears 7a 'and 7b' are mixed with each other as shown in the figure. The diameter of the tuning gear 7a 'of 4a is larger than the diameter of the tuning gear 7b' of the mixing shaft 4b, and is opposite to the rotation speed of the mixing shaft 4a rotating in the same direction as the drum 3 rotation direction. The mixing shaft 4b rotating in the direction is rotated slightly faster. By doing so, the material in the drum 3 stays biased toward one mixing shaft 4b (downstream with respect to the rotation direction of the drum 3 in FIG. 6) as the drum 3 rotates. It can be suppressed, and more materials can be retained in the mixing region at the lower part of the drum 3 so that a suitable mixing process can be performed. Therefore, it is possible to reduce the chance of material adhesion caused by this, and to suppress the adhesion growth of the material.

  If it is not necessary to synchronize the rotation of the mixing shafts 4a and 4b, the tuning gears of the mixing shafts 4a and 4b may be eliminated and rotated by individual drive motors. The mixing shafts 4a and 4b may be rotated at an appropriate rotation speed according to the type and properties of the material. If the material in the drum 3 does not deviate so much to one side of the drum as the drum 3 rotates, the mixing shafts 4a and 4b may be rotated at the same speed.

DESCRIPTION OF SYMBOLS 1 ... Continuous mixer 2 ... Machine stand 3 ... Drum (mixing tank) 4a, 4b ... Mixing shaft 6, 6 '... Mixing member 12 ... Input port 13 ... Discharge port 14 ... Input chute 19, 19' ... Scraper 24 ... Addition Nozzle

Claims (2)

  A mixing tank having a charging port at one end and a discharging port at the other end is rotatably provided by penetrating the mixing shaft. A plurality of mixing members are spirally provided around the mixing shaft. A continuous mixer for continuously mixing the adhering material charged into the mixing tank from the charging port while sequentially feeding the adhering material to the discharge port side as the mixing shaft rotates, wherein the mixing tank is a cylindrical drum. The upper part in the drum is provided with a scraper so as to be in sliding contact with the inner wall surface of the drum over the entire length of the drum. A continuous mixer configured to be moved upward and peeled off by the scraper.   The mixing shaft is a pair of mixing shafts parallel to the drum rotation axis and rotating in the opposite direction, and the mixing shaft rotating in the opposite direction to the rotation speed on the mixing shaft side rotating in the same direction as the drum rotation direction. 2. The continuous mixer according to claim 1, wherein the continuous mixer is configured so as to prevent the material in the drum from being biased toward one mixing shaft as the drum rotates.

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