JP2018118510A - Door for opening and shutting outlet of rubber kneader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door for opening and shutting the outlet of a rubber kneader, capable of restraining entanglement of a rubber being an object to be kneaded in a rotor.SOLUTION: There is provided a door 32 which is formed so that the side thereof inserted in a chamber 31 of a rubber kneader 100 has a bilaterally symmetrical chevron shape to open and shut an outlet 37 formed to the bottom of the chamber 31. In the door 32 in a cross-sectional view orthogonal to a longitudinal direction, a chevron-shaped contour 1 is made to be a first arc 1a recessed below until a middle part from a door lower end corner part 32a contacting the inside opening end of the outlet 37 toward a highest door apex 32b in a vertical direction, is made to be a straight line 1b inclined to a horizontal direction from the middle part and is made to be a second arc 1c recessed below until a door apex 32b.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a door that is provided at a discharge port formed at the bottom of a chamber of a rubber kneader and opens and closes the discharge port.

  Examples of this type of door include those described in Patent Documents 1 and 2.

The door (discharge door) described in Patent Document 1 has a shape specified as follows. On the lines (L ₁ ) and (L ₂ ) connecting the contacts (D) and (E) between the discharge port of the closed mixing chamber and the discharge door and the rotation centers (A) and (B) of the kneading rotor, A center (Q) of the radius (S) is provided. Using this center (Q) as a fulcrum, arcs passing through the contacts (D) and (E) are respectively drawn. The intersection of the arcs is the tip (P) of the discharge door. When a circular arc having a radius (R) is drawn with the swivel center (O) of the discharge door as a fulcrum, the tip (P) does not interfere with the contact (D) and the tip of the rotating kneading rotor, and the center ( The tip shape of the discharge door is formed so that Q) is as close as possible to the rotation centers (A) and (B) of the kneading rotor.

  With the discharge door of the above shape, the compound can be efficiently kneaded in the hermetic mixing chamber, and even if the compound that is easy to adhere is kneaded, the whole is not discharged when the compound is discharged, and the periphery of the discharge port is discharged. Patent Document 1 describes that the discharge of the compound can be performed easily and efficiently without being sandwiched between the doors or adhering to the gap between the peripheral edge of the discharge port and the discharge door. .

  The door (drop door) described in Patent Document 2 has a shape specified as follows. The ratio α (= h / R) between the height h of the drop door and the radius R of the chamber is set to 0.6 ≦ α ≦ 0.8.

  The drop door having the above shape improves the mixing and dispersing action in the kneading chamber and makes it possible to obtain a uniform kneaded material in a short time. Further, Patent Document 2 describes that since the space formed by the upper portion of the drop door and the rotor is reduced, the retention of the compounding agent and the material to be kneaded and the sticking are also reduced.

Japanese Patent No. 2562396 JP-A-8-332630

  A sheet-like rubber (rubber sheet) may be put into a rubber kneader and kneaded as a material to be kneaded. The rubber sheet may be wound around the rotor (kneading rotor) when the rubber sheet is in a solid state (in the form of a sheet) at the beginning of charging into the chamber.

  In any of the doors described in Patent Documents 1 and 2, all the slopes on the kneading chamber side in contact with the rubber are smooth and continuous curved surfaces. In addition, about the door of patent document 2, the slight part of the top part is made into the straight line extended in a horizontal direction. In the case of such a door, adhesion of rubber to the door is suppressed. However, when the material to be kneaded is a rubber sheet, the rubber is unlikely to stay at the door portion. Therefore, the rubber sheet is likely to be caught in the rotor.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a door that opens and closes a discharge port of a rubber kneader, which can suppress the rubber to be kneaded from being caught in the rotor. It is to be.

  The present invention is a door that opens and closes a discharge port formed at the bottom of a chamber of a rubber kneader and that has a symmetrical mountain shape on the side inserted into the chamber. This door has an intermediate part in the cross-sectional view orthogonal to the longitudinal direction, with the mountain-shaped outer shape from the lower end corner of the door contacting the inner opening end of the discharge port toward the highest door top in the vertical direction. A concave first arc is formed as a straight line that is inclined from the midway to the horizontal direction, and then a concave second arc is formed further down to the top of the door.

  According to the door configured as described above, the rubber can be retained to some extent in the vicinity of the door in the chamber, thereby suppressing the rubber from being caught in the rotor.

It is sectional drawing of a rubber kneader provided with the door which concerns on one Embodiment of this invention. It is a figure which shows the external shape (mainly only one side) of the mountain-shaped part of the door which concerns on several embodiment containing the door shown in FIG. It is a graph which shows the CV value ratio of the door of the shape of embodiment of this invention with respect to the door of a conventional shape. It is a figure for demonstrating the drawing method of the door external shape (arc) of the range of 0 <= x <= 0.65L. It is a figure for demonstrating the drawing method of the door external shape (arc) of the range of 0.825L <= x <= L. It is sectional drawing of the center part of the longitudinal direction of the door which concerns on one Embodiment of this invention. It is sectional drawing of the direction in alignment with the longitudinal direction of the door which concerns on one Embodiment of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(Configuration of rubber kneader)
A configuration of a rubber kneader 100 including a door 32 according to an embodiment of the present invention will be described with reference to FIG. The rubber to be kneaded by the rubber kneader provided with the door of the present invention is not limited to sheet-like rubber (rubber sheet).

  The rubber kneader 100 is a device for kneading rubber that is a material to be kneaded, and includes a supply unit 20 and a kneading unit 30. The supply unit 20 is a part that supplies the material to be kneaded to the kneading unit 30, and includes a hopper 21, a material supply cylinder 22, and a cylinder device 23.

  The hopper 21 is charged with rubber to be kneaded (material to be kneaded) from the outside of the rubber kneader 100. The material supply cylinder 22 is a cylinder through which the material to be kneaded can pass. The upper part of the material supply tube 22 communicates with the hopper 21.

  The cylinder device 23 is a device that pushes the material to be kneaded from the material supply cylinder 22 into the kneading section 30 (a kneading chamber 33 described later). The cylinder device 23 is a pneumatic actuator, for example. The cylinder device 23 includes a cylinder 24, a piston 25, a piston rod 26, and a floating weight 27.

  The floating weight 27 connected to the lower end of the piston rod 26 is a member that pushes the material to be kneaded introduced from the hopper 21 into the kneading chamber 33.

  The kneading part 30 is a part for kneading the material to be kneaded, and includes a chamber 31, a door 32 for opening and closing (opening and closing) a discharge port 37 formed at the bottom of the chamber 31, and a pair of rotors 34 and 35 (kneading). Rotor).

  The chamber 31 is a part in which a kneading chamber 33 is formed, and a supply port 36 for the material to be kneaded is provided in the upper part thereof. The floating weight 27 is lowered toward the supply port 36 from above.

  The kneading chamber 33 is a space where the material to be kneaded is kneaded. The vertical cross-sectional shape of the kneading chamber 33 is an eyebrows type. This vertical cross-sectional shape is a cross-sectional shape of the kneading chamber 33 when viewed from the axial direction of the rotors 34 and 35.

  The door 32 is driven by an actuator to open and close the discharge port 37 of the chamber 31. The discharge port 37 of the chamber 31 is closed by the door 32 during the kneading of the material to be kneaded, and is opened when the rubber (kneaded material) after kneading is taken out from the chamber 31. The actuator that drives the door 32 is, for example, a rotary actuator (rotary actuator). The door 32 (the shape of the door) has a great influence on the kneading degree of the rubber kneaded by the rotors 34 and 35 in the chamber 31 (in the kneading chamber 33).

  The rotors 34 and 35 are members for kneading the material to be kneaded, and are disposed in the chamber 31 (inside the kneading chamber 33). The rotors 34 and 35 rotate around their central axes. The rotation center C of the rotors 34 and 35 is shown in FIG. The rotors 34 and 35 rotate in different directions so that the opposing portions move downward.

(Door shape)
The door 32 will be described in detail. The door 32 has a mountain shape on the side inserted into the chamber 31. In addition, this mountain shape is a symmetrical shape in a cross-sectional view orthogonal to the longitudinal direction of the door 32.

  See, for example, the door 32 portion in FIG. 1 and the outline 1 in FIG. In the door 32 according to the embodiment of the present invention, in the cross-sectional view orthogonal to the longitudinal direction, the mountain-shaped outer shape 1 is the most vertically extending from the door lower end corner portion 32a contacting the inner opening end of the discharge port 37. To the high door top portion 32b, a first arc 1a that is concave down to the middle is a straight line 1b that is inclined from the middle to the horizontal direction, and then a second concave that is concave down to the door top 32b. The arc is 1c. In other words, the outer shape 1 of the mountain-shaped portion of the door 32 includes a first arc 1a, a straight line 1b, a second portion between the door lower end corner portion 32a and the door top portion 32b from the door lower end corner portion 32a toward the door top portion 32b. The arcs 1c are formed in this order. In addition, FIG. 2 is a figure which shows the external shape (mainly only one side) of the mountain-shaped part of the said door in the cross sectional view of the door orthogonal to a longitudinal direction. Moreover, the dashed-dotted line in FIG. 2 is a center line.

  In FIG. 2, the shape of the eight doors from the external shape 1 to the external shape 8 based on embodiment of this invention is shown. As shown in FIG. 2, each of the outer shapes 1 to 8 has a straight line between the door lower end corner portion 32a and the door top portion from the door lower end corner portion 32a toward the door top portion, and the first arcs 1a to 8a. 1b to 8b and second arcs 1c to 8c. In FIG. 2, the outer shape of the door (eccentric door) indicated by a dotted line labeled “prior art” is a smooth continuous curved surface except for the top of the door. Note that a small portion of the door top of this prior art is a straight line extending in the horizontal direction.

  The inventors of the present invention have a total of eight doors of outer shapes 1 to 8 shown in FIG. 2 and a door of the prior art shape shown in FIG. And the adhesion of rubber to the door was evaluated. The evaluation results are shown in Table 1. In addition, the rubber | gum as a material to be kneaded was made into a sheet-like rubber (rubber sheet) in an initial form (form when charged).

[Explanation of Table 1]
Entrainment ○: Effective in inhibiting entrainment
X: Kneading degree without entrainment inhibiting effect ◎: Very good
○: Good
×: Bad adhesion ○: No adhesion
Δ: Adhesion depending on the formulation
×: Always attached

[About rubber entrainment]
In the prior art, all of the slopes on the kneading chamber 33 side in contact with the rubber are smooth continuous curved surfaces. On the other hand, in the door of the present invention, as in the outer shapes 1 to 8 shown in FIG. 2, the slope on the kneading chamber 33 side in contact with the rubber extends from the door lower end corner portion 32 a toward the door top to the middle portion. The first arcs 1a to 8a are concave downward, the straight lines 1b to 8b are inclined from the midway to the horizontal direction, and then the second arcs 1c to 8c are concave downward to the top of the door. By having the straight lines 1b to 8b between the arcs (1a to 8a, 1c to 8c), rubber can be retained to some extent in the vicinity of the door in the chamber 31 (in the kneading chamber 33). Involvement of rubber into 34 and 35 can be suppressed. That is, all of the eight doors having the outer shapes 1 to 8 have an effect of suppressing the rubber entrainment, whereas the doors of the prior art have no effect of suppressing the entrainment of rubber. This evaluation is shown in Table 1 with ○ and ×.

[Influence on kneading degree]
FIG. 3 is a graph showing a CV value ratio of the doors of the outer shapes 1 to 8 of the embodiment of the present invention shown in FIG. 2 with respect to the door having the conventional shape shown in FIG. Here, the CV value is an index by which it can be determined that the rubber distribution / mixing progresses as the value decreases. Further, the CV value ratio is a CV value (CV value ratio) of each door when the CV value of the door of the conventional technology shape shown in FIG. The CV value ratio indicates that the smaller the value, the better the rubber mixing. The graph of FIG. 3 shows the CV value ratio after the rotors 34 and 35 have made 10 revolutions when the flow analysis is performed on a total of nine doors including the prior art.

  As can be seen from FIG. 3, the doors having CV values improved by 10% or more than the doors of the prior art shape (eccentric door) were four doors of the outer shape 1, the outer shape 2, the outer shape 4, and the outer shape 8. Further, the doors whose CV value was improved by less than 10% were two doors of the outer shape 6 and the outer shape 7. In addition, the CV value of the two doors of the outer shape 3 and the outer shape 5 was worse than that of the door of the prior art shape. These results are shown in Table 1 as ◎, ○, ×.

[Rubber adhesion]
By conducting a flow analysis on a total of nine doors including the prior art, the adhesion of rubber to each door was evaluated. As shown in Table 1, adhesion of rubber was not recognized for the doors of the prior art shape and the doors of the outer shapes 1, 2, 4 to 6 of the embodiment of the present invention. Regarding the door of the outer shape 8 of the embodiment of the present invention, adhesion of rubber was recognized depending on the blending of rubber. For each of the doors of the outer shapes 3 and 7 of the embodiment of the present invention, adhesion of rubber was always recognized.

[About more preferable door shape]
Regarding the shape of the door, as described above, in the cross-sectional view orthogonal to the longitudinal direction, the outer shape of the mountain shape is a first circular arc that is concave down to the middle part from the door lower end corner portion 32a to the door top portion, A straight line that inclines from the midway to the horizontal direction, and then a second arc that is concave down to the top of the door, so that the rubber is used to some extent in the vicinity of the door in the chamber 31 (inside the kneading chamber 33). It can be made to stay, and this can suppress the entrainment of rubber in the rotors 34 and 35.

<1. In addition to suppressing rubber entrainment, the door is less likely to adhere to rubber and can improve rubber distribution and mixing>
A more preferable door shape will be described with reference to FIGS. Here, in a cross-sectional view orthogonal to the longitudinal direction, the door lower end corner portion 32a is the origin O, the horizontal direction is the x axis, and the direction from the door lower end corner portion 32a to the door top portion in the horizontal direction is the positive x axis (FIG. 5) (refer to the x-axis arrow in FIG. 5). Further, the vertical direction is the y-axis, the direction from the door lower end corner 32a to the door top in the vertical direction is the positive y-axis (see the arrow on the y-axis in FIGS. 4 and 5), and between the origin O and the door top. Let L be the horizontal distance. For the outer shapes 1 to 8, the range of 0 ≦ x ≦ 0.65L is the first arcs 1a to 8a, the range of 0.65L ≦ x ≦ 0.825L is the straight lines 1b to 8b, and The range of 825L ≦ x ≦ L is the second arcs 1c to 8c.

  As for the adhesion of rubber, the influence of the door shape in the range of 0 ≦ x ≦ 0.65L is large. Although the shape of the door in the range of 0.65L ≦ x ≦ 0.825L has a smaller influence than the shape of the door in the range of 0 ≦ x ≦ 0.65L, it slightly affects the rubber adhesion. On the other hand, the distribution and mixing (kneading) of rubber is greatly influenced by the shape of the door top portion (range of 0.825L ≦ x ≦ L). Therefore, the mountain-shaped region in the range of 0.825L ≦ x ≦ L of the door is a region where rubber distribution and mixing are improved.

  From Table 1, in addition to suppressing rubber entrainment, the outer shape of the mountain-shaped portion of the door, which is less likely to adhere to rubber and can improve rubber distribution and mixing, is in the range of 0 ≦ x ≦ 0.65L. The first arc having a constant curvature passing through a region satisfying the following equation (1), and an outer shape in a range of 0.65L ≦ x ≦ 0.825L passes through a region satisfying the following equation (2). , A straight line inclined with respect to the horizontal direction, and an outer shape in a range of 0.825L ≦ x ≦ L is a second arc having a constant curvature passing through a region satisfying the following expression (3). That is. As will be described in detail later, it is necessary that p <0.825L, where p is the x coordinate of the center point of the second arc.

・・・・・式（１）
θ：ゴム混練機１００のロータの回転中心Ｃを中心とする原点Ｏを通る半径Ｒの円の原点Ｏにおける接線の水平方向に対する傾斜角（図４参照）
Ｒ：ゴム混練機１００のロータの回転中心Ｃを中心とする原点Ｏを通る円の半径であって（図４参照）、且つチャンバ３１の内壁面の円形状部の半径（図１参照）

・ ・ ・ ・ ・ Formula (1)
θ: Inclination angle with respect to the horizontal direction of the tangent line at the origin O of a circle having a radius R passing through the origin O centered on the rotation center C of the rotor of the rubber kneader 100 (see FIG. 4)
R: radius of a circle passing through the origin O centered on the rotation center C of the rotor of the rubber kneader 100 (see FIG. 4), and radius of the circular portion of the inner wall surface of the chamber 31 (see FIG. 1)

  The arc equation on the left side in the equation (1) is an arc equation of a part of the circle indicated by the solid line with the center S1 and the radius of 0.76R shown in FIG. 4, and the arc equation on the right side in the equation (1) is FIG. 4 is a partial arc formula of a circle indicated by a solid line having a center S2 and a radius of 0.63R shown in FIG. A circle center S1 indicated by a solid line having a radius of 0.76R is centered on a straight line perpendicular to a tangent to the origin O of a circle having a radius R passing through the origin O centered on the rotation center C of the rotor and the origin O. This is the upper point of the two intersections with a circle indicated by a dotted line with a radius of 0.76R. A circle center S2 indicated by a solid line with a radius of 0.63R is centered on a straight line perpendicular to the tangent to the origin O of a circle with a radius R passing through the origin O centered on the rotation center C of the rotor, and the origin O. This is the upper point of the two intersections with a circle indicated by a dotted line having a radius of 0.63R.

  Further, the left-side arc equation in the equation (1) is an arc equation including the first arcs 6a, 7a, and 8a (see FIG. 2) of the outer shapes 6, 7, and 8, and the right-side in the equation (1). The arc formula includes the first arcs 1a, 2a, 3a (see FIG. 2) of the outer shapes 1, 2, and 3.

・・・・・式（２）
θ：ゴム混練機１００のロータの回転中心Ｃを中心とする原点Ｏを通る半径Ｒの円の原点Ｏにおける接線の水平方向に対する傾斜角（図４参照）
Ｒ：ゴム混練機１００のロータの回転中心Ｃを中心とする原点Ｏを通る円の半径であって（図４参照）、且つチャンバ３１の内壁面の円形状部の半径（図１参照）

・ ・ ・ ・ ・ Formula (2)
θ: Inclination angle with respect to the horizontal direction of the tangent line at the origin O of a circle having a radius R passing through the origin O centered on the rotation center C of the rotor of the rubber kneader 100 (see FIG. 4)
R: radius of a circle passing through the origin O centered on the rotation center C of the rotor of the rubber kneader 100 (see FIG. 4), and radius of the circular portion of the inner wall surface of the chamber 31 (see FIG. 1)

  The straight line expression on the left side in Expression (2) indicates the straight line 6b (see FIG. 2) of the outer shape 6, and the straight line expression on the right side in Expression (2) indicates the straight line 1b in the outer shape 1 (see FIG. 2). Show.

・・・・・式（３）
Ｒ：ゴム混練機１００のロータの回転中心Ｃを中心とする原点Ｏを通る円の半径であって（図５参照）、且つチャンバ３１の内壁面の円形状部の半径（図１参照）
ｌ１：ロータの回転中心Ｃを中心とする半径が０．９９Ｒの円と、ドア頂部をとおる直線ｘ＝Ｌとの２つの交点のうちの下方の点Ｐ１を通る傾きがｔａｎ（θ＋１２４）の直線Ｌ１と、当該下方の点Ｐ１を中心とする半径が０．１６Ｒの円との２つの交点のうちの上方の点Ｑ１のｘ座標（図５参照）
ｍ１：ロータの回転中心Ｃを中心とする半径が０．９９Ｒの円と、ドア頂部をとおる直線ｘ＝Ｌとの２つの交点のうちの下方の点Ｐ１を通る傾きがｔａｎ（θ＋１２４）の直線Ｌ１と、当該下方の点Ｐ１を中心とする半径が０．１６Ｒの円との２つの交点のうちの上方の点Ｑ１のｙ座標（図５参照）
ｌ２：ロータの回転中心Ｃを中心とする半径が１．０５Ｒの円と、ドア頂部をとおる直線ｘ＝Ｌとの２つの交点のうちの下方の点Ｐ２を通る傾きがｔａｎ（θ＋１２４）の直線Ｌ２と、当該下方の点Ｐ２を中心とする半径が０．４３Ｒの円との２つの交点のうちの上方の点Ｑ２のｘ座標（図５参照）
ｍ２：ロータの回転中心Ｃを中心とする半径が１．０５Ｒの円と、ドア頂部をとおる直線ｘ＝Ｌとの２つの交点のうちの下方の点Ｐ２を通る傾きがｔａｎ（θ＋１２４）の直線Ｌ２と、当該下方の点Ｐ２を中心とする半径が０．４３Ｒの円との２つの交点のうちの上方の点Ｑ２のｙ座標（図５参照）
θは、ゴム混練機１００のロータの回転中心Ｃを中心とする原点Ｏを通る半径Ｒの円の原点Ｏにおける接線の水平方向に対する傾斜角である。また、ｍ１≦０．６５Ｌ、ｍ２≦０．６５Ｌ、ｙ≦ｍ１である。

・ ・ ・ ・ ・ Formula (3)
R: radius of a circle passing through the origin O centered on the rotation center C of the rotor of the rubber kneader 100 (see FIG. 5), and radius of the circular portion of the inner wall surface of the chamber 31 (see FIG. 1)
l1: A straight line with an inclination of tan (θ + 124) passing through a lower point P1 of two intersections of a circle having a radius of 0.99R centered on the rotation center C of the rotor and a straight line x = L passing through the top of the door The x coordinate of the upper point Q1 of the two intersections of L1 and a circle centered on the lower point P1 and having a radius of 0.16R (see FIG. 5)
m1: A straight line with an inclination of tan (θ + 124) passing through a lower point P1 of two intersections of a circle having a radius of 0.99R centered on the rotation center C of the rotor and a straight line x = L passing through the top of the door The y coordinate of the upper point Q1 of two intersections of L1 and a circle having a radius of 0.16R centered on the lower point P1 (see FIG. 5)
l2: a straight line having an inclination of tan (θ + 124) passing through a lower point P2 of two intersections of a circle having a radius of 1.05R centered on the rotation center C of the rotor and a straight line x = L passing through the top of the door The x coordinate of the upper point Q2 of the two intersections of L2 and a circle having a radius of 0.43R centered on the lower point P2 (see FIG. 5)
m2: a straight line having an inclination of tan (θ + 124) passing through a lower point P2 of two intersections of a circle having a radius of 1.05R centered on the rotation center C of the rotor and a straight line x = L passing through the top of the door The y coordinate of the upper point Q2 of two intersections of L2 and a circle having a radius of 0.43R centered on the lower point P2 (see FIG. 5)
θ is an inclination angle with respect to the horizontal direction of the tangent line at the origin O of a circle having a radius R passing through the origin O with the rotation center C of the rubber kneader 100 as the center. Further, m1 ≦ 0.65L, m2 ≦ 0.65L, and y ≦ m1.

  The straight line x = L passing through the top of the door is also a perpendicular bisector that connects the centers of the two rotors 34 and 35.

  The arc equation on the left side in the equation (3) is an arc equation of a part of a circle indicated by a solid line with a center Q2 (l2, m2) and a radius of 0.43R shown in FIG. The right-side arc equation (the right equation in equation (3)) is an arc equation of a part of a circle indicated by a solid line having a center Q1 (l1, m1) and a radius of 0.16R shown in FIG. Further, the left-side arc equation in the equation (3) is an arc equation including the second arc 6c (see FIG. 2) of the outer shape 6, and the right-side arc equation (equation (3)) in the equation (3). The right expression in FIG. 2 is an arc expression including the second arc 1c of the outer shape 1 (see FIG. 2).

  Here, in the door of the outer shape 3, the rubber distribution and mixing deteriorated (see Table 1). This is because the middle part of the second arc 3c is depressed (lowered) than the end (x = 0.825L) of the second arc 3c on the door lower end corner part 32a side. It is believed that this results in poor rubber distribution and mixing. Therefore, when a shape in which the middle part of the second arc is not recessed from the end (x = 0.825L) of the second arc on the door lower end corner part 32a side is obtained, for example, as an outer shape 4 (second arc 4c) Therefore, if the x coordinate of the center point of the second arc is p, it is necessary that p <0.825L.

<2. In addition to suppressing rubber entrainment, the door is less likely to adhere to rubber and can further improve rubber distribution and mixing>
From Table 1, the outer shape of the mountain-shaped portion of the door, which is less likely to adhere to rubber and can further improve the distribution and mixing of the rubber, in addition to suppressing the entrainment of rubber, is the outer shape in the range of 0 ≦ x ≦ 0.65L. Is defined as the first arc having a constant curvature passing through a region satisfying the following expression (4), and the outer shape in the range of 0.65L ≦ x ≦ 0.825L further satisfies the following expression (5): A second curve having a constant curvature that passes through the region, is a straight line that is inclined with respect to the horizontal direction, and has an outer shape in the range of 0.825L ≦ x ≦ L that passes through the region that further satisfies the following expression (6). It is an arc.

・・・・・式（４）
式（４）の中のθ、およびＲは、前記した式（１）、式（２）の中のθ、およびＲと同じである。

・ ・ ・ ・ ・ Formula (4)
Θ and R in Formula (4) are the same as θ and R in Formula (1) and Formula (2) described above.

  The arc equation on the left side in the equation (4) is a partial arc equation of the circle indicated by the solid line with the center S1 and the radius of 0.71R shown in FIG. 4, and the arc equation on the right side in the equation (4) is FIG. 4 is a partial arc formula of a circle indicated by a solid line having a center S2 and a radius of 0.63R shown in FIG. A circle center S1 indicated by a solid line having a radius of 0.71R is centered on a straight line perpendicular to the tangent line at the origin O of a circle having a radius R passing through the origin O centered on the rotation center C of the rotor and the origin O. This is the upper point of the two intersections with a circle indicated by a dotted line with a radius of 0.71R. A circle center S2 indicated by a solid line with a radius of 0.63R is centered on a straight line perpendicular to the tangent to the origin O of a circle with a radius R passing through the origin O centered on the rotation center C of the rotor, and the origin O. This is the upper point of the two intersections with a circle indicated by a dotted line having a radius of 0.63R.

  Further, the left-side arc equation in the equation (4) is an arc equation including the first arcs 4a and 5a (see FIG. 2) of the outer shapes 4 and 5, and the right-side arc equation in the equation (4) is The first, second, and third arcs 1a, 2a, and 3a (see FIG. 2) are arc-shaped.

・・・・・式（５）
式（５）の中のθ、およびＲは、前記した式（１）、式（２）の中のθ、およびＲと同じである。

..... Formula (5)
Θ and R in Formula (5) are the same as θ and R in Formula (1) and Formula (2) described above.

  The linear equation on the left side in the equation (5) indicates the straight line 4b (see FIG. 2) of the outer shape 4, and the linear equation on the right side in the equation (2) indicates the straight line 1b (see FIG. 2) in the outer shape 1. Show.

・・・・・式（６）
式（６）の中のＲ、ｌ１、およびｍ１は、前記した式（３）の中のＲ、ｌ１、およびｍ１はと同じである。
ｌ３：ロータの回転中心Ｃを中心とする半径が１．０５Ｒの円と、ドア頂部をとおる直線ｘ＝Ｌとの２つの交点のうちの下方の点Ｐ２を通る傾きがｔａｎ（θ＋８０）の直線Ｌ３と、当該下方の点Ｐ２を中心とする半径が０．４３Ｒの円との２つの交点のうちの上方の点Ｑ３のｘ座標（図５参照）
ｍ３：ロータの回転中心Ｃを中心とする半径が１．０５Ｒの円と、ドア頂部をとおる直線ｘ＝Ｌとの２つの交点のうちの下方の点Ｐ２を通る傾きがｔａｎ（θ＋８０）の直線Ｌ３と、当該下方の点Ｐ２を中心とする半径が０．４３Ｒの円との２つの交点のうちの上方の点Ｑ３のｙ座標（図５参照）
θは、ゴム混練機１００のロータの回転中心Ｃを中心とする原点Ｏを通る半径Ｒの円の原点Ｏにおける接線の水平方向に対する傾斜角である。また、ｍ１≦０．６５Ｌ、ｍ３≦０．６５Ｌ、ｙ≦ｍ１である。

..... Formula (6)
R, l1 and m1 in formula (6) are the same as R, l1 and m1 in formula (3).
l3: A straight line with an inclination of tan (θ + 80) passing through a lower point P2 of two intersections of a circle having a radius of 1.05R centered on the rotation center C of the rotor and a straight line x = L passing through the top of the door The x coordinate of the upper point Q3 of two intersections of L3 and a circle having a radius of 0.43R centered on the lower point P2 (see FIG. 5)
m3: a straight line having an inclination of tan (θ + 80) passing through a lower point P2 of two intersections of a circle having a radius of 1.05R centered on the rotation center C of the rotor and a straight line x = L passing through the top of the door The y coordinate of the upper point Q3 of two intersections of L3 and a circle having a radius of 0.43R centered on the lower point P2 (see FIG. 5)
θ is an inclination angle with respect to the horizontal direction of the tangent line at the origin O of a circle having a radius R passing through the origin O with the rotation center C of the rubber kneader 100 as the center. Further, m1 ≦ 0.65L, m3 ≦ 0.65L, and y ≦ m1.

  The straight line x = L passing through the top of the door is also a perpendicular bisector that connects the centers of the two rotors 34 and 35. Further, the left-side arc equation in the equation (6) is an arc equation including the second arc 4c (see FIG. 2) of the outer shape 4, and the right-side arc equation in the equation (6) is the outer shape 1 The arc type includes the second arc 1c (see FIG. 2).

(Attaching a thermometer to the door)
The attachment of the thermometer 40 to the door 32 will be described with reference to FIGS. As shown in FIGS. 6 and 7, the central portion in the longitudinal direction of the door top portion 32 b is a recess 38. A hole 39 is formed in the concave portion 38, and a thermometer 40 is inserted and fixed (installed) in the hole 39. The concave portion 38 has a curved surface as shown in FIG.

  In a cross-sectional view orthogonal to the longitudinal direction, the mountain-shaped outer shape 1 of the door 32, excluding the recess 38, is formed by the first arc 1a, the straight line 1b, and the second arc 1c over the entire length of the door 32 in the longitudinal direction. Has been. The thermometer 40 is installed so as not to protrude above the door top portion 32b. According to this configuration, adhesion of rubber in the vicinity of the thermometer 40 installation of the door 32 can be prevented.

  As shown in FIG. 6, the concave portion 38 has a bilaterally symmetrical mountain shape in a cross-sectional view orthogonal to the longitudinal direction of the door 32. Here, when the height (height dimension) of the door top 32b excluding the recess 38 is T1, and the height (height dimension) of the mountain-shaped top 38b of the recess 38 is T2, 0.71T1 ≦ When Tx is the height (height dimension) of the door top portion 32b of the portion excluding the concave portion 38, which satisfies T2 ≦ 0.96T1 and is specified by the right equation in the above equation (3), 0 .79Tx ≦ T2 is also satisfied, and when viewed from the longitudinal direction of the door 32, the tip of the thermometer 40 is preferably disposed between the door top 32b and the mountain-shaped top 38b of the recess 38. . According to this configuration, wear and breakage of the thermometer 40 can be prevented, and the temperature of the rubber flowing in the chamber 31 can be measured more accurately.

  Further, as shown in FIG. 7, the length D2 of the crest-shaped top portion 38b of the recess 38 in the longitudinal direction is longer than the diameter Dt of the thermometer 40 and 1 / of the length D1 of the door 32 in the longitudinal direction. The length is preferably less than 2. Note that the length D2 in the longitudinal direction of the crest-shaped top portion 38b of the recess 38 is less than ½ of the length D1 in the longitudinal direction of the door 32. This means that the length D2 in the longitudinal direction of 38b is less than the length in the longitudinal direction of the door 32 (= D1-D2) of the portion other than the concave portion 38. According to this configuration, the rubber flowing in the chamber 31 can be prevented from adhering to the installation portion of the thermometer 40, and the temperature of the rubber can be measured more accurately. Further, the wrapping of the sheet-like rubber can be suppressed. The length D2 in the longitudinal direction of the crest-shaped top portion 38b of the recess 38 is the length from one end to the other end in the longitudinal direction of the top portion 38b, that is, the hole 39 portion where the thermometer 40 is inserted and fixed. Including length.

(Modification)
In the door of the embodiment shown in FIG. 2, the outer shape changes from a circular arc to a straight line at a position of 0.65L from the door lower end corner portion 32a to the top of the door in the horizontal direction, and from a straight line to a circular arc at a position of 0.825L. It has changed. The position where the arc changes to a straight line may slightly deviate from the 0.65L position. Further, the position where the line changes from a straight line to a circular arc may be slightly shifted from the position of 0.825L.

1 to 8: Outlines 1a to 8a: First arcs 1b to 8b: Straight lines 1c to 8c: Second arc 31: Chamber 32: Door 32a: Door lower end corner 32b: Door top 37: Discharge port 38: Recess 40: Temperature Total 100: Rubber kneader

Claims (6)

A door that opens and closes a discharge port formed at the bottom of the chamber of the rubber kneader, the side to be inserted into the chamber is a symmetrical mountain shape,
In the cross-sectional view orthogonal to the longitudinal direction, the mountain-shaped outer shape is recessed downward from the door lower end corner portion in contact with the inner opening end of the discharge port to the middle portion toward the highest door top portion in the vertical direction. The first arc is a straight line inclined with respect to the horizontal direction from the midway part, and is further a second arc that is concave down to the top of the door.
A door that opens and closes the outlet of a rubber kneader. The door according to claim 1,
In a cross-sectional view orthogonal to the longitudinal direction, the lower end corner of the door is the origin, the horizontal direction is the x axis, the direction from the lower end corner of the door in the horizontal direction to the top of the door is the positive x axis, the vertical direction is the y axis, The range from 0 ≦ x ≦ 0.65L, where the direction from the lower end corner of the door in the vertical direction to the door top is positive on the y-axis and the horizontal distance between the origin and the door top is L. Is defined as the first arc having a constant curvature passing through the region satisfying the formula (1), and the outer shape in the range of 0.65L ≦ x ≦ 0.825L satisfies the region satisfying the formula (2). The straight line passing through and the outer shape in the range of 0.825L ≦ x ≦ L is the second arc having a constant curvature passing through a region satisfying the expression (3).
A door that opens and closes the outlet of a rubber kneader.
However, the x coordinate p of the center point of the second arc is p <0.825L.

・ ・ ・ ・ ・ Formula (1)

・ ・ ・ ・ ・ Formula (2)

・ ・ ・ ・ ・ Formula (3)
θ: Inclination angle of the circle passing through the origin centered on the rotation center of the rotor of the rubber kneader with respect to the horizontal direction of the tangent at the origin R: Circle of the circle passing through the origin centered on the rotation center of the rotor of the rubber kneader A radius and a radius of the circular portion of the inner wall surface of the chamber. 11: a circle having a radius of 0.99R around the rotation center of the rotor and a straight line x = L passing through the top of the door. The x-coordinate of the upper point of the two intersections of the straight line having the slope of tan (θ + 124) passing through the lower point of the intersection and the circle having the radius of 0.16R centered on the lower point m1: A straight line with a slope of tan (θ + 124) passing through a lower point of two intersections of a circle having a radius of about 0.99R with the rotation center of the rotor as a center and a straight line x = L passing through the top of the door; The radius around the lower point is 0. Y coordinate of the upper point of the two intersections with the 6R circle l2: two circles having a radius of 1.05R centered on the rotation center of the rotor and a straight line x = L passing through the top of the door The x-coordinate of the upper point of the two intersections of the straight line having the slope of tan (θ + 124) passing through the lower point of the intersection and the circle having the radius of 0.43R centered on the lower point m2: A straight line having an inclination of tan (θ + 124) passing through a lower point of two intersections of a circle having a radius around the rotation center of the rotor of 1.05R and a straight line x = L passing through the top of the door; Y-coordinate of the upper point of the two intersections with the circle whose radius is 0.43R centered on the lower point The door according to claim 2,
The outer shape in the range of 0 ≦ x ≦ 0.65L is further defined as the first arc having a constant curvature passing through the region satisfying the expression (4), and the outer shape in the range of 0.65L ≦ x ≦ 0.825L. Is a straight line that passes through a region satisfying the formula (5), and the outer shape in a range of 0.825L ≦ x ≦ L further passes through a region satisfying the formula (6). The second arc,
A door that opens and closes the outlet of a rubber kneader.

・ ・ ・ ・ ・ Formula (4)

..... Formula (5)

..... Formula (6)
θ: Inclination angle of the circle passing through the origin centered on the rotation center of the rotor of the rubber kneader with respect to the horizontal direction of the tangent at the origin R: Circle of the circle passing through the origin centered on the rotation center of the rotor of the rubber kneader A radius and a radius of the circular portion of the inner wall surface of the chamber. 11: a circle having a radius of 0.99R around the rotation center of the rotor and a straight line x = L passing through the top of the door. The x-coordinate of the upper point of the two intersections of the straight line having the slope of tan (θ + 124) passing through the lower point of the intersection and the circle having the radius of 0.16R centered on the lower point m1: A straight line with a slope of tan (θ + 124) passing through a lower point of two intersections of a circle having a radius of about 0.99R with the rotation center of the rotor as a center and a straight line x = L passing through the top of the door; The radius around the lower point is 0. Y coordinate of the upper point of the two intersections with the 6R circle l3: two of a circle having a radius of 1.05R centering on the rotation center of the rotor and a straight line x = L passing through the top of the door The x-coordinate of the upper point of the two intersections of the straight line with the slope of tan (θ + 80) passing through the lower point of the intersection and the circle centered on the lower point and the radius of 0.43R m3: A straight line having an inclination of tan (θ + 80) passing through a lower point of two intersections of a circle having a radius around the rotation center of the rotor of 1.05R and a straight line x = L passing through the top of the door; Y-coordinate of the upper point of the two intersections with the circle whose radius is 0.43R centered on the lower point The door according to claim 2 or 3,
The central part in the longitudinal direction of the door top is a recess,
A thermometer is installed in the recess,
In the cross-sectional view orthogonal to the longitudinal direction, the mountain-shaped outer shape of the portion excluding the recess is formed by the first arc, the straight line, and the second arc.
A door that opens and closes the outlet of a rubber kneader. The door according to claim 4,
The concave portion has a bilaterally symmetrical mountain shape in a cross-sectional view orthogonal to the longitudinal direction of the door,
When the height of the top portion of the door excluding the concave portion is T1, and the height of the mountain-shaped top portion of the concave portion is T2,
0.71T1 ≦ T2 ≦ 0.96T1 is satisfied,
And when the height of the door top portion of the portion excluding the concave portion specified by the right formula in the formula (3) is Tx,
0.79Tx ≦ T2 is also satisfied,
When viewed from the longitudinal direction of the door, the tip of the thermometer is disposed between the door top and the mountain-shaped top of the recess,
A door that opens and closes the outlet of a rubber kneader. The door according to claim 4 or 5,
The concave portion has a bilaterally symmetrical mountain shape in a cross-sectional view orthogonal to the longitudinal direction of the door,
The length in the longitudinal direction of the crest-shaped top of the recess is longer than the diameter of the thermometer and less than half the length in the longitudinal direction of the door.
A door that opens and closes the outlet of a rubber kneader.

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