JP2018108732A - Door for opening/closing outlet of rubber kneading machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door for opening/closing an outlet of a rubber kneading machine, which can restrain rubber-to-be-kneaded from getting caught in a rotor.SOLUTION: In a door 32 for opening/closing an outlet 37 formed in the bottom of a chamber 31 of a rubber kneading machine 100, the side of insertion into the chamber 31 is formed in a symmetrical chevron shape. In a cross-sectional view orthogonal to a longitudinal direction, a chevron-shaped outer form 1 of the door 32 assumes an arc shape 1a that becomes downward concave shape to a midway part toward the vertically highest door top 32b from a corner 32a at a lower end of the door, which is brought into contact with an inner side opening end of the outlet 37. A section from the midway part to the door top 32b is set to be a linear line 1b that is inclined with respect to a horizontal direction.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. An arc that is concave downward is a straight line that is inclined with respect to the horizontal direction from the midway part 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 (straight line) of the range of 0.75L <= x <= L. It is a figure for demonstrating the drawing method of the door external shape (arc) of the range of 0 <= x <= 0.75L. 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 part 32b, it is set as the circular arc 1a concaved down to the middle part, and it is set as the straight line 1b inclined with respect to a horizontal direction from the middle part to the door top part 32b. In other words, the outer shape 1 of the mountain-shaped portion of the door 32 has one arc 1a and one straight line 1b 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. And only formed. 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 single arc 1 a to 8 a and 1 between the door lower end corner portion 32 a and the door top portion, from the door lower end corner portion 32 a to the door top portion. It is formed only with the straight lines 1b to 8b. 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
×: 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 concave arcs 1a to 8a are formed downward, and the straight lines 1b to 8b are inclined from the midway part to the top of the door with respect to the horizontal direction. By making the door top side a straight line inclined with respect to the horizontal direction, rubber can be retained to some extent in the vicinity of the door in the chamber 31 (in the kneading chamber 33). Can be prevented. 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 a CV value improved by 10% or more than the door of the prior art shape (eccentric door) were the three doors of the outer shape 1, the outer shape 2, and the outer shape 7. Further, the doors whose CV value was improved by less than 10% were four doors of the outer shape 3, the outer shape 5, the outer shape 6, and the outer shape 8. In addition, although the door of the outer shape 4 was slightly smaller than the door of a prior art shape, the CV value deteriorated. 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, the adhesion of rubber was not recognized for the doors of the prior art shape and the outer shapes 1 to 3 and 5 to 7 of the embodiment of the present invention, but the outer shape of the embodiment of the present invention. For each of the doors 4 and 8, adhesion of rubber was observed.

[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 mountain-shaped outer shape is formed as a concave arc downward from the door lower end corner portion 32a toward the door top to the middle portion. The rubber is allowed to stay to some extent in the vicinity of the door in the chamber 31 (inside the kneading chamber 33) by being a straight line that is inclined with respect to the horizontal direction from the top to the top of the door. It is possible to suppress the rubber from entraining.

<1. In addition to suppressing rubber entrainment, the door 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 the horizontal between the origin O and the door top. Let the distance in the direction be L. As for the external shapes 1-8, the range of 0 <= x <= 0.75L is made into the circular arcs 1a-8a, respectively, and the range of 0.75L <= x <= L is made into the straight lines 1b-8b.

  In the distribution mixing (kneading) of rubber, the influence of the shape of the door top portion side is large. Therefore, the mountain-shaped region in the range of 0.75 L ≦ x ≦ L of the door is a region where rubber distribution and mixing is improved.

  In the range of 0.75L ≦ x ≦ L of the door, the door outer shape that can improve the rubber distribution and mixing is a straight line that passes through a region that satisfies the following formula (1) and is inclined with respect to the horizontal direction. It is that.

tan (θ + 15) × x + b2 ≦ y ≦ tan (θ + 13) × x + b1 Expression (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)
b1: The inclination passing through the lower point P1 of the two intersections of the circle having a radius R1 of 0.99R centered on the rotation center C of the rotor and the straight line x = L passing through the top of the door is tan (θ + 13). Straight section (section y coordinate) (see Fig. 4)
b2: An inclination passing through a lower point P2 of two intersections of a circle having a radius R2 of 1.06R centered on the rotation center C of the rotor and a straight line x = L passing through the door top is tan (θ + 15). Straight section (section y coordinate) (see Fig. 4)
However, the slope of the straight line is tan (θ-14) or more

  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 linear equation in the equation (1) indicates the straight line 8b (see FIG. 2) of the outer shape 8, and the right-side linear equation in the equation (1) (the right equation in the equation (1)). Indicates a straight line 1b of the outer shape 1 (see FIG. 2).

  As can be seen from FIG. 3 and Table 1, the door of the outer shape 4 is a door that has not improved the rubber distribution and mixing. This is because the rubber flow stagnates at the top of the door due to the gentle inclination of the straight line 4b of the outer shape 4. The inclination of the straight line 4b of the outer shape 4 is tan (θ-14). Therefore, the door outer shape that can improve rubber distribution and mixing in the range of 0.75L ≦ x ≦ L of the door is a straight line that passes through a region that satisfies the above formula (1), and the straight line It is necessary that the inclination is tan (θ-14) or more.

  Next, in the range of 0 ≦ x ≦ 0.75 L, the door outer shape capable of improving the rubber distribution and mixing is an arc having a constant curvature passing through a region satisfying the following expression (2). That is.

・・・・・式（２）
但し、上記ｙは、次の式（３）を満たす。

・・・・・式（３）
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５参照）
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）

・ ・ ・ ・ ・ Formula (2)
However, the above y satisfies the following formula (3).

・ ・ ・ ・ ・ Formula (3)
θ: Inclination angle with respect to the horizontal direction of the tangent line at the origin O of a circle of radius R passing through the origin O centered on the rotation center C of the rubber kneader 100 (see FIG. 5)
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)

  Note that the left-side arc equation in the equation (2) is a partial arc equation of the circle having the center C2 and the radius R4 of 1.1R shown in FIG. 5, and the right-side arc equation in the equation (2). Is an arc of a part of a circle having a center C1 and a radius R3 of 0.9R shown in FIG. Further, the left-side arc equation in the equation (2) is an arc equation including the arc 7a of the outer shape 7 and the arc 8a (see FIG. 2) of the outer shape 8, and the right-side arc equation in the equation (2) is The arc type includes an arc 1a of the outer shape 1 and an arc 2a of the outer shape 2 (see FIG. 2).

  Summarizing the above description of the door shape that can improve rubber distribution and mixing while suppressing the rubber from being caught in the rotors 34 and 35, the door shape is 0 ≦ x with respect to the mountain-shaped portion of the door. The outer shape in the range of ≦ 0.75L is an arc having a constant curvature passing through the region satisfying the above formula (2), and the outer shape in the range of 0.75L ≦ x ≦ L is the above formula (1). That is, it is a straight line passing through a region satisfying However, the inclination of the straight line should be tan (θ-14) or more.

<2. In addition to suppressing rubber entrainment and improving rubber distribution and mixing, it is difficult for rubber to adhere to the door>
From Table 1, the outer shape of the mountain-shaped portion of the door, which can improve rubber distribution and mixing while suppressing rubber entrainment in the rotors 34 and 35, and the rubber hardly adheres to the door, is 0 ≦ x ≦ The outer shape in the range of 0.75L is an arc having a constant curvature passing through the region satisfying the following equation (4), and the outer shape in the range of 0.75L ≦ x ≦ L is further expressed by the following equation ( 6) A straight line passing through a region satisfying 6).

・・・・・式（４）
但し、上記ｙは、次の式（５）を満たす。

・・・・・式（５）

・ ・ ・ ・ ・ Formula (4)
However, the above y satisfies the following formula (5).

..... Formula (5)

tan (θ + 8) × x + b3 ≦ y ≦ tan (θ + 13) × x + b1 (6)
b3: The inclination passing through the lower point P2 of the two intersections of the circle having the radius R2 of 1.06R centered on the rotation center C of the rotor and the straight line x = L passing through the top of the door is tan (θ + 8). Straight section (section y coordinate) (see Fig. 4)
However, the slope of the straight line is tan (θ-14) or more

  In addition, θ, R, and b1 in the formulas (4) to (6) are the same as θ, R, and b1 in the above formulas (1) to (3).

  Further, the left-side arc equation in the equation (4) is a partial arc equation of the circle having the center C2 and the radius R4 of 1.05R shown in FIG. 5, and the right-side arc equation in the equation (4). Is an arc of a part of a circle having a center C1 and a radius R3 of 0.9R shown in FIG. Further, the left-side arc equation in the equation (4) is an arc equation including the arc 5a of the outer shape 5 and the arc 6a (see FIG. 2) of the outer shape 6, and the right-side arc equation in the equation (4) is The arc type includes an arc 1a of the outer shape 1 and an arc 2a of the outer shape 2 (see FIG. 2).

  In addition, the left-side linear equation in equation (6) indicates the straight line 6b (see FIG. 2) of the outer shape 6, and the right-side linear equation in equation (6) is the straight line 1b of the outer shape 1 (see FIG. 2). ).

<3. Door that can further improve rubber distribution and mixing than the door described above>
From Table 1, the outer shape of the mountain-shaped portion of the door that can further improve the rubber mixing and mixing while suppressing the rubber from getting into the rotors 34 and 35 and the rubber is difficult to adhere to the door is 0.75L. The outer shape in the range of ≦ x ≦ L is a straight line that passes through a region that satisfies the following expression (7).

tan (θ + 1) × x + b4 ≦ y ≦ tan (θ + 13) × x + b1 (7)
b4: An inclination passing through a lower point P2 of two intersections of a circle having a radius R2 of 1.01R centered on the rotation center C of the rotor and a straight line x = L passing through the top of the door is tan (θ + 1). Straight section (section y coordinate) (see Fig. 4)
However, the slope of the straight line is tan (θ-14) or more

  Note that θ in equation (7) is the same as θ in equations (1) to (3) described above.

  Further, the left-side linear expression in the equation (7) indicates the straight line 2b (see FIG. 2) of the outer shape 2, and the right-hand linear equation in the equation (7) is the straight line 1b of the outer shape 1 (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, a mountain-shaped outer shape 1 of the door 32, excluding the recess 38, is formed by an arc 1a and a straight line 1b over the entire length of the door 32 in the longitudinal direction. 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 ≦ The height (height dimension) of the portion of the door top portion 32b that satisfies T2 ≦ 0.96T1 and is specified by the right equation (tan (θ + 13) × x + b1) in the above equation (1), excluding the recess 38. ) Tx, 0.79Tx ≦ T2 is also satisfied. When viewed from the longitudinal direction of the door 32, the tip of the thermometer 40 is located between the door top 32b and the mountain-shaped top 38b of the recess 38. It is preferable to arrange | position. 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.

1-8: Outlines 1a-8a: Arcs 1b-8b: Straight line 31: Chamber 32: Door 32a: Door lower end corner 32b: Door top 37: Discharge port 38: Recess 40: Thermometer 100: Rubber kneader

Claims (7)

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. Is a straight line inclined with respect to the horizontal direction from the midway part 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 ≦ 0.75 L where the direction from the lower end corner of the door to the top of the door in the vertical direction is positive on the y-axis, and the horizontal distance between the origin and the top of the door is L. The outer shape is a circular arc having a constant curvature that passes through the region satisfying the formula (1), and the outer shape in the range of 0.75L ≦ x ≦ L passes through the region satisfying the formula (2). The straight line,
A door that opens and closes the outlet of a rubber kneader.
However, the inclination of the straight line is tan (θ-14) or more.

・ ・ ・ ・ ・ Formula (1)
tan (θ + 15) × x + b2 ≦ y ≦ tan (θ + 13) × x + b1 Expression (2)
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 b1: a circle having a radius of about 0.99R around the rotation center of the rotor and a straight line x = L passing through the top of the door Intersection of a straight line with a slope of tan (θ + 13) passing through the lower point of the intersection b2: A circle having a radius of 1.06R centered on the rotation center of the rotor and a straight line x = L passing through the top of the door Intersection of a straight line with a slope of tan (θ + 15) passing through the lower point of the two intersections The door according to claim 2,
The outer shape in the range of 0 ≦ x ≦ 0.75L is further defined as the arc having a constant curvature passing through the region satisfying the expression (3), and the outer shape in the range of 0.75L ≦ x ≦ L is Furthermore, the straight line passing through the region satisfying the formula (4) is used.
A door that opens and closes the outlet of a rubber kneader.

・ ・ ・ ・ ・ Formula (3)
tan (θ + 8) × x + b3 ≦ y ≦ tan (θ + 13) × x + b1 Expression (4)
b3: a straight line having an inclination of tan (θ + 8) passing through a lower point of two intersections of a circle having a radius of 1.06R centered on the rotation center of the rotor and a straight line x = L passing through the top of the door Section of The door according to claim 3,
The outer shape in the range of 0.75 L ≦ x ≦ L is the straight line passing through a region satisfying the formula (5).
A door that opens and closes the outlet of a rubber kneader.
tan (θ + 1) × x + b4 ≦ y ≦ tan (θ + 13) × x + b1 Expression (5)
b4: a straight line having an inclination of tan (θ + 1) passing through a lower point of two intersections of a circle having a radius of 1.01R centered on the rotation center of the rotor and a straight line x = L passing through the top of the door Section of In the door in any one of Claims 2-4,
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 concave portion is formed by the arc and the straight line.
A door that opens and closes the outlet of a rubber kneader. The door according to claim 5,
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 recessed portion specified by the right equation in the equation (2) 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 5 or 6,
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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