JP6624237B2 - Kneading device - Google Patents

Description

  The present invention relates to a kneading device.

2. Description of the Related Art An apparatus for kneading a core material by rotating a stirrer arranged in a kneading space in a kneading pot is known.
Patent Literature 1 discloses a kneading apparatus including a stirring pin arranged parallel to a rotation axis of a stirrer, and an injection piston that can penetrate the stirring pin and slide toward an injection port in a kneading space. Have been.

JP-A-2006-195990

The inventors have found the following problems with respect to a kneading device.
In the kneading apparatus disclosed in Patent Document 1, the core material is kneaded by rotating a stirrer. The kneaded core material constitutes a core paste. The core paste is filled in the injection mold by sliding the injection piston toward the injection port. The filled core paste solidifies in the injection mold. The solidified core paste constitutes the core. After the core paste is injected into the kneading space, the next core material is charged.

  When the injection piston slides toward the injection port, a part of the core paste may remain on the injection port side of the kneading space. When the injection mold is filled with the core paste, it is heated to a high temperature. The injection port of the kneading space communicates with the cavity of the injection mold. Therefore, the temperature of the injection port side end of the kneading pot becomes high when the injection mold is heated. Therefore, the core paste remaining on the injection port side of the kneading space has a high temperature. When the temperature of the remaining core paste becomes high, the amount of water is reduced by drying.

  The remaining core paste is kneaded with the next core material to form the next core paste. Therefore, the water content of the next core paste varies depending on the water content of the remaining core paste.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a kneading apparatus capable of setting a water content to a predetermined value.

  One mode for achieving the above object is that a stirrer having a stirring pin that extends around the rotation axis in a kneading space provided in a kneading pot and that is parallel to the rotation axis, and kneading in the kneading space. And an injection piston for filling the injected core paste into an injection mold adjacent to the kneading pot, wherein the solid material is supplied from an inlet provided on the kneading space on the side opposite to the injection mold. Is adjusted, and according to the remaining amount of the core paste in the kneading space, the amount of the liquid material ejected from the nozzle provided on the injection molding die side is adjusted. Accordingly, the amount of the liquid material ejected from the nozzle provided on the inlet side is adjusted.

  In the kneading apparatus according to the present invention, the solid material is charged from the input port provided on the side opposite to the injection mold in the kneading space, and is provided on the injection molding die side according to the remaining amount of the core paste in the kneading space. Adjust the amount of liquid material injected from the nozzle. Furthermore, the amount of the liquid material ejected from the nozzle provided on the inlet side is adjusted according to the amount of the solid material that has been charged. Therefore, an appropriate amount of liquid material can be sprayed on each of the remaining core paste and the charged solid material. Therefore, the water content can be set to a predetermined value.

  ADVANTAGE OF THE INVENTION According to this invention, the kneading apparatus which can make a water content a predetermined value can be provided.

It is sectional drawing of the kneading apparatus concerning this Embodiment. It is sectional drawing of the kneading apparatus which injected the core paste. It is a sectional view of a kneading device into which a solid material has been introduced. FIG. 3 is a cross-sectional view of the kneading device into which a liquid material has been charged.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, in order to clarify the description, the following description and drawings are simplified as appropriate.

  First, the configuration of the kneading apparatus according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, the kneading apparatus 1 includes a kneading pot 2, a stirrer 3, a linear actuator 4, a liquid ejection mechanism 5, an injection piston 6, and a control mechanism 11. FIG. 1 also shows the core paste 7. In FIG. 1, a dashed line indicates a rotation axis of the stirrer 3.

  It should be noted that the right-handed xyz rectangular coordinates shown in FIG. 1 and other drawings are for convenience in describing the positional relationship of the components. Usually, the positive direction of the z-axis is vertically upward and the xy plane is the horizontal plane, which is common between the drawings.

  The kneading pot 2 is provided with a kneading space 2a inside. The core material is kneaded in the kneading space 2a. The core material is a solid material 8a and a liquid material 8b shown in FIG. The kneading pot 2 is provided with an input port 2b and an injection port 2c. The injection port 2c communicates with a cavity of an injection mold (not shown). The solid material 8a shown in FIG. 4 is charged into the kneading space 2a from the charging port 2b. The solid material 8a is foundry sand. The foundry sand is, for example, natural sand. The foundry sand may be artificial sand. The solid material 8a is kneaded with the liquid material 8b shown in FIG. The liquid material 8b is a binder for the solid material 8a. The liquid material 8b contains, for example, water glass and water.

  The kneading apparatus 1 is provided with a liquid ejecting mechanism 5 as shown in FIG. The liquid ejecting mechanism 5 has nozzles 5a and 5b communicating with the kneading space 2a. The liquid ejection mechanism 5 is connected to a container or the like that stores the liquid material 8b. The liquid material 8b stored in a container or the like is injected from the nozzles 5a and 5b and is injected into the kneading space 2a.

  The solid material 8a and the liquid material 8b charged into the kneading space 2a are kneaded in the kneading space 2a. The core paste 7 shown in FIG. 1 is a paste obtained by kneading a solid material 8a and a liquid material 8b. The core paste 7 may contain an additive in addition to the solid material 8a and the liquid material 8b. The core paste 7 is injected from the injection port 2c and is filled in the cavity of the injection mold.

  The kneading apparatus 1 includes a control mechanism 11 as shown in FIG. The control mechanism 11 controls the linear actuator 4 and the liquid ejection mechanism 5. The control mechanism 11 can perform setting input of a control operation by operating means (not shown). Although details will be described later, in the example shown in FIG. 1, the control mechanism 11 can measure the remaining amount of the core paste in the kneading space 2a. Further, the control mechanism 11 can adjust the amount of the liquid material 8b ejected from the nozzle 5a according to the remaining amount of the core paste 7. Further, the control mechanism 11 can adjust the amount of the liquid material 8b ejected from the nozzle 5b in accordance with the amount of the supplied solid material 8a.

  As shown in FIG. 1, a stirrer 3 is disposed in the kneading space 2a. The stirrer 3 can rotate around the rotation axis shown in FIG. The stirrer 3 includes a stirring pin 3a and a rotation base 3b. The rotation base 3b is a disk-shaped member arranged perpendicular to the rotation axis. A drive gear (not shown) is arranged on the periphery of the rotation base 3b. The drive gear is meshed with the edge of the rotation base 3b. The drive gear is connected to a stirrer motor (not shown). When the stirrer motor is driven, the drive gear rotates about the rotation axis of the stirrer 3. With the rotation of the drive gear, the stirrer 3 rotates around the rotation axis.

  The stirring pin 3a extends parallel to the rotation axis from the surface of the rotation base 3b on the side of the injection port 2c. The position where the stirring pin 3a is arranged is not particularly limited as long as it is a surface on the side of the injection port 2c of the rotary base 3b. The stirring pins 3a are, for example, arranged radially around the rotation axis. Further, the stirring pin 3a may be arranged in an S-shape so as to be point-symmetric about the rotation axis of the stirring element 3 as a center point. The shape of the stirring pin 3a is not particularly limited as long as it is a column extending parallel to the rotation axis. The stirring pin 3a has, for example, a circular cross section. Further, the stirring pin 3a may have a rectangular cross section.

  As shown in FIG. 1, a linear actuator 4 is installed at the end of the kneading pot 2 opposite to the injection port 2c. The linear actuator 4 includes a ball nut 4a, a ball screw 4b, and a geared motor 4c. When the geared motor 4c is driven, the ball nut 4a rotates about a rotation axis. A ball screw 4b passes through the center of the ball nut 4a.

  A spiral groove is provided on the side surface of the ball screw 4b. The groove provided in the ball screw 4b is engaged with the ball nut 4a. Therefore, when the ball nut 4a is rotated by the drive of the geared motor 4c, the ball screw 4b can be rotated about the rotation axis. When the ball screw 4b is rotated around the rotation axis, the ball screw 4b advances and retreats parallel to the rotation axis.

  An injection piston 6 is connected to an end of the ball screw 4b on the injection port 2c side. In the example shown in FIG. 1, a rotatable ball screw 4b is connected to the center of the injection piston. That is, the ball screw 4b can allow the rotation of the injection piston 6. The injection piston 6 is always in contact with the inner peripheral surface of the kneading pot 2, in other words, the wall surface of the kneading space 2a. Therefore, the injection piston 6 slides on the wall surface of the kneading space 2a as the ball screw 4b advances and retreats.

  As shown in FIG. 1, the stirring pin 3a penetrates the injection piston 6. Therefore, when the stirrer 3 rotates, the injection piston 6 rotates together with the stirring pin 3a. That is, the injection piston 6 does not hinder the rotation of the stirrer 3. The injection piston 6 can move back and forth in parallel with the rotation axis without being affected by the stirrer 3.

  When kneading the core material in the kneading apparatus 1, first, the injection piston 6 is disposed so as to be located closer to the linear actuator 4 than the inlet 2b. Next, the core material is charged into the kneading space 2a from the charging port 2b. Next, the stirrer 3 is rotated by driving the stirrer motor. The core material put into the kneading space 2 a is kneaded by the rotation of the stirrer 3.

  After sufficiently kneading the core paste 7, the injection piston 6 is slid toward the injection port 2c. The core paste 7 is injected from the injection port 2c by sliding of the injection piston 6. The core paste 7 injected from the injection port 2c is filled in the cavity. The core paste 7 filled in the cavity is solidified. The solidified core paste 7 forms a core. The core manufactured by using the kneading apparatus according to the present invention is used, for example, for manufacturing a vehicle-mounted engine component.

  Next, an operation when the next core material is charged into the kneading apparatus according to the present embodiment will be described with reference to FIGS. FIG. 2 is a cross-sectional view of the kneading device into which the core paste has been injected. FIG. 3 is a cross-sectional view of the kneading device into which the solid material has been charged. FIG. 4 is a cross-sectional view of the kneading device into which the liquid material has been charged. 2 to 4, the core paste 7, the solid material 8a, and the liquid material 8b are also illustrated. 2 to 4 indicate the rotation axis of the stirrer 3.

  When injecting a sufficient amount of core paste 7 into the cavity, the injection piston 6 is located on the injection port 2c side as shown in FIG. The position of the injection piston 6 changes according to the amount of the core paste 7 remaining in the kneading space 2a. The control mechanism 11 can measure the amount of the remaining core paste 7 by measuring the position of the injection piston 6 at the time of injection.

  The injection piston 6 slides toward the linear actuator 4 after injecting a sufficient amount of the core paste 7. And as shown in FIG. 2, it is arrange | positioned so that it may be located in the linear actuator 4 side rather than the injection port 2b. When solidifying the core paste 7 filled in the cavity, the injection mold is heated. The injection port 2c is adjacent to the cavity. Therefore, when the injection mold is heated, the temperature of the injection port 2c side of the kneading space 2a becomes high. Therefore, the core paste 7 remaining in the kneading space 2a is dried. That is, the residual core paste 7 has a small amount of water.

  Next, the solid material 8a is charged from the charging port 2b. The control mechanism 11 adjusts the amount of the solid material 8a to be charged according to the amount of the remaining core paste 7. As shown in FIG. 3, the solid material 8a is introduced into the kneading space 2a on the side of the introduction port 2b.

  After the solid material 8a is charged, the liquid material 8b is charged from the liquid ejecting mechanism 5. The liquid ejection mechanism 5 has nozzles 5a and 5b. The nozzles 5a and 5b can spray the liquid material 8b in a mist state. The nozzle 5a is a nozzle provided on the injection port side of the kneading space 2a. The nozzle 5b is a nozzle provided on the inlet side of the kneading space 2a. The remaining core paste 7 remains on the injection port side of the kneading space 2a as shown in FIG. Then, the liquid material 8b is ejected from the nozzle 5a to the remaining core paste 7. On the other hand, the liquid material 8b is jetted from the nozzle 5b to the charged solid material 8a.

  The amount of the liquid material 8b ejected from the nozzle 5a is determined according to the amount of the remaining core paste 7. Further, the amount of the liquid material 8b ejected from the nozzle 5b is determined according to the amount of the supplied solid material 8a. Therefore, an appropriate amount of the liquid material 8b can be sprayed on each of the remaining core paste 7 and the charged solid material 8a. With such a configuration, the water content of the next core paste can be set to a predetermined value.

  In the example illustrated in FIG. 4, a case has been described in which both the amounts of the liquid material 8b ejected from the nozzles 5a and 5b are determined using the control mechanism 11. However, the amount of the liquid material 8b ejected from the nozzles 5a, 5b may be determined manually. Further, the amount of the remaining core paste 7 may be measured manually.

  In the example shown in FIG. 4, the liquid material 8b is ejected using the liquid ejecting mechanism 5 having two nozzles 5a and 5b. Therefore, the liquid material 8b can be jetted uniformly in the kneading space 2a as compared with a case where a liquid jetting mechanism having a single nozzle is used.

  As shown in FIG. 4, the nozzle 5a is preferably arranged at an angle at which the liquid material 8b can be ejected substantially perpendicularly to the inclined surface of the remaining core paste 7. When the liquid material 8b is sprayed substantially perpendicularly to the inclined surface of the remaining core paste 7, the liquid material 8b is widely sprayed on the surface of the remaining core paste 7. Therefore, the distribution of the liquid material 8b is hardly concentrated at one place.

  Further, as shown in FIG. 4, it is preferable that the nozzle 5b is disposed at an angle at which the liquid material 8b can be ejected substantially perpendicularly to the inclined surface of the charged solid material 8a. When the liquid material 8b is ejected substantially perpendicularly to the inclined surface of the charged solid material 8a, the liquid material 8b is widely ejected onto the surface of the charged solid material 8a. Therefore, the distribution of the liquid material 8b is hardly concentrated at one place.

  By arranging the nozzles 5a and 5b at the above angles, the liquid material 8b can be widely jetted onto the remaining core paste 7 and the charged solid material 8a. Therefore, the next variation in the water content of the core paste can be suppressed in a short kneading time.

  In the example shown in FIG. 4, the case where the liquid ejecting mechanism 5 has two nozzles 5a and 5b has been described. However, the number of nozzles included in the liquid ejecting mechanism 5 is not particularly limited as long as it is two or more. The liquid ejecting mechanism 5 may have, for example, three or more nozzles.

  The composition of the liquid material 8b ejected from the nozzles 5a and 5b may be the same or different. For example, the amount of water contained in the liquid material 8b ejected from the nozzle 5a may be increased according to the amount of water remaining in the core paste 7.

  According to the invention according to the present embodiment described above, a kneading apparatus capable of setting the water content to a predetermined value can be provided.

  The present invention is not limited to the above embodiment, and can be appropriately changed without departing from the gist. The case where the present invention is applied to the technique of kneading the casting core paste has been described above. However, the present invention can be applied to any technique as long as the material is kneaded in the apparatus. For example, the present invention can be applied to a kneading device for kneading food or a kneading device for kneading concrete.

DESCRIPTION OF SYMBOLS 1 Kneading apparatus 2 Kneading pot 2a Kneading space 2b Input port 2c Injection port 3 Stirrer 3a Stirring pin 3b Rotary base 4 Linear actuator 4a Ball nut 4c Geared motor 5 Liquid injection mechanism 5a Nozzle 5b Nozzle 6 Injection piston 7 Core paste 8a Solid material 8b Liquid material 11 Control mechanism

Claims (4)

In the kneading space provided in the kneading pot, while rotating about a rotation axis parallel to the horizontal direction as a center, a stirrer having a stirring pin extending parallel to the rotation axis,
An injection port provided at one end of the kneading space in the extending direction of the stirrer,
An injection piston for filling a core paste in which a solid material and a liquid material are kneaded by the stirrer into an injection mold from the injection port,
In the kneading space, provided at the other end side in the extending direction of the stirrer than the injection port in the kneading space, and an inlet for charging the solid material into the kneading space,
A first nozzle and a second nozzle for injecting the liquid material into the kneading space,
In a state where the rotation axis of the stirrer is parallel to the horizontal direction,
The first nozzle injects the liquid material toward a side closer to the injection port than the input port in the kneading space,
The second nozzle injects the liquid material toward a side closer to the input port than the injection port in the kneading space,
Kneading device. According to the input amount of the solid material from the input port, further comprising a control mechanism for adjusting the injection amount of the liquid material from the second nozzle,
The kneading device according to claim 1. The control mechanism further includes:
Adjust the input amount of the solid material according to the residual amount of the core paste,
The kneading device according to claim 2. The control mechanism further includes:
Adjusting the input amount of the liquid material from the first nozzle according to the residual amount of the core paste,
The kneading apparatus according to claim 2.

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