JP4801692B2 - Kneading machine - Google Patents

Description

  The present invention relates to a kneader used for kneading rubber, plastics, foods and the like.

  A sectional view of a conventional general kneader is shown in FIG. In FIG. 12, 1 is a kneader casing, 2 is a kneading chamber sealed by the casing 1, the floating weight 25, and a drop door 26, 3 is a kneading rotor, and 4 is a shaft of the rotor 3. The two rotors 3 are arranged in parallel in the kneading chamber 2 and are rotated in different directions by driving devices (not shown) (motors, power transmission gears, etc.) installed at the end of the rotor shaft 4. To do. Further, the rotor 3 is formed with a protruding portion 5 that partially protrudes in the radial direction, and the inner wall of the kneading chamber 2 has a curved surface shape corresponding to the locus when the protruding portion 5 rotates.

  In this kneader, raw materials such as rubber and plastic and additives such as chemicals (hereinafter simply referred to as kneaded material) are transferred to the hopper 27 while the floating weight 25 that can be raised and lowered is raised (the two-dot chain line in FIG. 12). The material is charged into the kneading chamber 2 from the charging port 28, and the floating weight 25 is lowered to pressurize the kneaded material. In this state, the rotor 3 is rotated, and the kneaded material is caught between the rotors 3 to perform the kneading operation. When the kneading is completed, the kneaded material is discharged to the outside by opening the drop door 26 at the bottom of the casing 1.

  In the present kneader, the rotor shaft 4 is disposed so as to penetrate the kneading chamber 2, so that the kneaded material kneaded under pressure does not leak from the end of the kneading chamber 2 to the outside. Further, it is necessary to provide a leakage preventing means on the end face of the rotor 3. Therefore, in the conventional apparatus, for example, a dust seal 22 as shown in the schematic structural diagram of the end of the kneader in FIG. 13 is used for sealing. Since the dust seal 22 is always pressed against the end face of the rotor 3 via the presser foot 23 by the spring force of the spring 24, the dust seal 22 is very effective as compared with other leakage prevention means such as a labyrinth.

  However, a gap B (about 0.5 to 1.0 mm) is indispensable between the end face of the rotor 3 with rotation and the fixed casing 1 due to problems of dimensional accuracy, and the kneaded material enters the gap B. It is possible. Further, if the kneaded material reaches the gap A between the casing 1 and the dust seal 22, the dust seal 22 and the casing 1 are fixed, so that even if a force is applied by the spring 24, the dust seal 22 remains on the end surface of the rotor 3. There is a problem that it does not come into sufficient contact. As a result, the kneaded material leaks from the gap formed between the end face of the rotor 3 and the dust seal 22.

  Therefore, the object of the present invention is that the kneaded material does not easily enter the gap B between the casing 1 and the rotor 3, and the kneaded material reaches the gap A between the casing 1 and the dust seal 22 even if it enters for some reason. It is intended to provide a kneader capable of preventing the leakage of the kneaded material to the outside of the kneader.

The present invention provides the following means to solve the above-described problems.
In a kneader having a casing for containing a kneaded product and a kneading rotor that rotates inside the casing,
(1) Provided on the end face of the rotor or the face of the casing facing the rotor end face is at least one step and an inclined surface that gradually increases from the bottom of the step and reaches the top of the step. Is formed so as to go from the rotor center side to the peripheral edge, and the inclined surface is inclined in a direction in which a gap with the casing is widened from the rotor central side to the peripheral edge with respect to the radial direction of the rotor. kneader, characterized in that there.
(2) the step, as kneaded product with the rotation of the upper SL rotor is guided to the peripheral direction, above, characterized in that is inclined in the rotation direction front side of the rotor to the radial direction of the rotor The kneading machine according to ( 1 ).

According to the invention described in claim 1 of the present application, at least one step on the end surface of the rotor or the surface of the casing facing the rotor end surface, and the top of the step gradually increase from the bottom of the step. And the step is formed so as to go from the rotor central portion side to the peripheral portion, and the inclined surface is a casing as it goes from the rotor central portion side to the peripheral portion with respect to the radial direction of the rotor. And the kneaded material that has entered the gap between the casing and the end surface of the rotor is caught by the step portion, and is guided in the peripheral direction along with the rotation of the rotor. It can be discharged from the gap.
Further, according to the invention described in claim 2 of the present application, as the kneaded product that has entered the gap between the Ke pacing and the rotor end face, kneaded material with the rotation of the rotor is guided to the peripheral direction, the rotor Can be guided to the peripheral edge by a step inclined to the front side in the rotational direction of the rotor with respect to the radial direction of the rotor, and can be discharged from the gap.
According to the invention described in claim 1 or claim 2 of the present application, since the kneaded material can be prevented from entering the gap between the casing and the dust seal, the kneaded material is prevented from leaking outside the kneader. can do.

  First, Reference Example 1 will be described with reference to FIGS. 1 to 3, 1 is a casing of a kneading machine, 2 is a kneading chamber, 3 is a rotor for kneading, 4 is a shaft of the rotor 3, 5 is a protrusion of the rotor 3, and 21 is a rotation of the rotor 3. The direction, 22 is a dust seal, and 6a is a groove provided on the end face of the rotor 3. Although not shown in FIGS. 1 to 3, the dust seal 22 is always pressed against the end face of the rotor 3 through the presser foot 23 by the spring force of the spring 24 as in the conventional example shown in FIG. 12. The arrow a in the figure indicates the direction of the pressing force of the spring (the same applies hereinafter). The kneading chamber 2 is sealed by the casing 1, the floating weight 25, and the drop door 26, and the inner wall has a curved shape corresponding to the locus of rotation of the rotor protrusion 5. Further, two rotors 3 are arranged in parallel in the kneading chamber 2 and are rotated in different directions by a driving device (not shown) (motor, power transmission gear, etc.) installed at the end of the rotor shaft 4. Thus, the same kneading operation as in the conventional example is performed.

  The groove 6 a in FIG. 2 is closed at the end on the dust seal 22 side, and draws a spiral in the direction opposite to the rotational direction 21 from the end toward the peripheral edge of the rotor 3. It extends to the part and opens there. That is, the groove 6a and the kneading chamber 2 communicate with each other by opening at that position.

  Further, the groove 6b of FIG. 3 showing an example different from FIG. 2 is formed at the root portion of the protruding portion 5 of the rotor 3, and the end on the rotation direction 21 side of the rotor is closed and protrudes from the end. While drawing a convex chevron in the part direction, it extends to the peripheral edge of the rotor and opens there. That is, the groove 6b and the kneading chamber 2 communicate with each other by opening at that position.

  According to the groove 6 a shown in FIG. 2, even if the kneaded material enters the gap between the end surface of the rotor 3 and the casing 1 during the kneading operation, the kneaded material enters the groove 6 a and accompanies the rotation of the rotor 3. To the peripheral direction. Further, the groove 6a is closed at the end on the dust seal 22 side, and the end on the peripheral edge side of the rotor 3 is opened to communicate with the kneading chamber 2, so that the kneaded material sequentially returns to the kneading chamber, and the casing 1 and the dust seal It is possible to prevent the kneaded material from entering the gap with the 22.

  Further, according to the groove 6b shown in FIG. 3, the groove 6b is formed at the root portion of the protruding portion 5 of the rotor 3, so that it enters through the gap between the protruding portion 5 and the casing 1 having the highest pressure during the kneading operation. The kneaded material can be effectively captured and returned to the kneading chamber 2, and the kneaded material can be prevented from entering the gap between the casing 1 and the dust seal 22.

  In addition, although the groove | channel 6a of FIG. 2 is formed in the helical form, you may provide in linear form. In this case, it is effective to slightly incline from the position parallel to the radial direction to the front side in the rotational direction. Moreover, although the groove | channel 6b of FIG. 3 has drawn the convex-shaped mountain shape in the protrusion part direction of the rotor 3, you may provide in linear form or curved form.

  In the kneader according to the reference example 1, the grooves 6a and 6b are provided on the end surface of the rotor 3. However, when the grooves are provided on the surface of the casing 1 facing the end surface of the rotor 3, the grooves are dust seals. It is formed from the outer peripheral surface of 22 slightly outside the peripheral edge of the rotor, and is formed so as to draw a spiral in the same direction as the rotational direction as it goes to the peripheral edge of the rotor 3, or a position parallel to the radial direction Is provided in a straight line slightly inclined in the direction of rotation.

  Next, Reference Example 2 will be described with reference to FIGS. 4 and 5, 1 is a casing of the kneader, 2 is a kneading chamber, 3 is a rotor for kneading, 4 is a shaft of the rotor 3, 5 is a protruding portion of the rotor 3, and 21 is a rotation direction of the rotor 3. , 22 is a dust seal, and 7 is a convex portion provided on the end face of the rotor 3. Although omitted in FIGS. 4 and 5, the other configuration is the same as that of the conventional example shown in FIG. 12, and the same kneading work as that of the conventional example is performed.

  4 and 5 are linearly inclined from the outer peripheral surface on the dust seal 22 side to the peripheral edge of the rotor 3 from a position parallel to the radial direction to the front side in the rotational direction.

  According to the convex portion 7 shown in FIGS. 4 and 5, even if the kneaded material enters the gap between the end face of the rotor 3 and the casing 1 during the kneading operation, the kneaded material is caught by the convex portion 7, As the rotor 3 rotates, it is guided in the peripheral direction. Furthermore, since the convex portion 7 is formed up to the peripheral edge of the rotor 3, the kneaded product is returned to the kneading chamber in sequence, and the kneaded product can be prevented from entering the gap between the casing 1 and the dust seal 22.

  4 and 5 is formed in a straight line shape, but may be provided in a curved line that draws a spiral in the direction opposite to the rotation direction as it goes to the peripheral edge of the rotor 3. .

  4 and 5 is appropriately determined in consideration of wear resistance, corrosion resistance, etc. depending on the physical properties of the kneaded material. For example, stainless steel is generally used for rubber. The The convex portion 7 may be formed integrally with the rotor 3 by casting or the like, or may be separately attached by welding or the like, and the gap between the convex portion 7 and the casing 1 is adjusted by adjusting the size of the convex portion 7. It is also possible.

  In the kneading machine according to the reference example 2, the explanation is made with an example in which the convex portion 7 is provided on the end surface of the rotor 3, but when the convex portion is provided on the surface of the casing 1 facing the end surface of the rotor 3, the rotor 3 It is effective to form a spiral in the same direction as the rotation direction as it goes to the peripheral edge, or to provide a straight line slightly inclined to the rotation direction side with respect to the radial direction.

  Next, another study example 1 will be described with reference to FIGS. 6 and 7, 1 is a casing of the kneader, 2 is a kneading chamber, 3 is a rotor for kneading, 4 is a shaft of the rotor 3, 5 is a protrusion of the rotor 3, and 21 is a rotation direction of the rotor 3. , 22 is a dust seal, and 8 is a brush-like seal member provided on the end face of the rotor 3. Although omitted in FIGS. 6 and 7, the other configuration is the same as that of the conventional example shown in FIG.

  The brush-like seal member 8 of FIGS. 6 and 7 is formed in a donut shape between the outer peripheral surface of the dust seal 22 and the peripheral edge of the rotor 3.

  According to the brush-like seal member 8 shown in FIGS. 6 and 7, even if the kneaded material enters the gap between the end surface of the rotor 3 and the casing 1 during the kneading operation, the kneaded material remains in the brush-like seal member 8. Since it accumulates on the peripheral edge and is subsequently dammed up by the brush-like seal member 8 and the accumulated kneaded material, it is possible to prevent the kneaded material from entering the gap between the casing 1 and the dust seal 22.

  The material of the brush-like seal member 8 shown in FIGS. 6 and 7 is appropriately determined in consideration of wear resistance, corrosion resistance, etc., depending on the physical properties of the kneaded material. For example, stainless steel is generally used for rubber. used. The brush-like seal member 8 can be attached by opening a large number of holes on the end face of the rotor 3 and planting the brush-like seal member 8 for spot welding, or attaching a separately produced one by welding or the like. It is also possible to adjust the gap between the brush-like seal member 8 and the casing 1 by adjusting the size of the brush-like seal member 8.

  In the kneader according to the other examination example 1, the brush-like seal member 7 is provided on the end surface of the rotor 3. However, the brush-like seal member 7 is provided on the surface of the casing 1 that faces the end surface of the rotor 3. May be provided.

  Next, an embodiment of the present invention will be described with reference to FIGS. 8 and 9, 1 is a casing of the kneader, 2 is a kneading chamber, 3 is a rotor for kneading, 4 is a shaft of the rotor 3, 5 is a protrusion of the rotor 3, and 21 is a rotation of the rotor 3. The direction, 9 is a step provided on the end face of the rotor 3, and 10 is an inclined portion provided on the end face of the rotor 3. Although omitted in FIGS. 8 and 9, the other configuration is the same as that of the conventional example shown in FIG. 12, and the same kneading work as that of the conventional example is performed.

  The step 9 in FIGS. 8 and 9 is formed in parallel to the radial direction of the rotor 3 from the outer peripheral surface of the dust seal 22 to the periphery of the rotor 3, and the inclined surface 10 extends from the lower part of the step 9 to the rotor. It is formed so that it gradually increases as it advances in the rotation direction 21 and reaches the top of the step 9.

  According to the step 9 and the inclined surface 10 shown in FIGS. 8 and 9, even if the kneaded material enters the gap between the end surface of the rotor 3 and the casing 1 during the kneading operation, the kneaded material is caught by the step 9. At the same time, it is guided in the peripheral direction as the rotor rotates. Further, since the step 9 is formed up to the peripheral edge of the rotor 3, the kneaded material sequentially returns into the kneading chamber, and the kneaded material can be prevented from entering the gap between the casing 1 and the dust seal 22.

  8 and 9 is formed in parallel to the radial direction of the rotor 3, it may be provided in a straight line slightly inclined to the front side in the rotational direction with respect to the radial direction. In addition, it is effective that the inclined surface 10 is inclined with respect to the radial direction of the rotor 3 in a direction in which a gap with the casing 1 increases from the outer peripheral surface of the dust seal 22 toward the peripheral portion of the rotor 3.

  In the kneader according to the embodiment of the present invention, an example in which the step 9 and the inclined surface 10 are provided on the end surface of the rotor 3 is described. When the inclined surface 10 is provided, the inclined surface 10 is formed so as to gradually lower from the top of the step 9 in the rotational direction 21 of the rotor and reach the lower part of the step 9.

  Next, another study example 2 will be described with reference to FIGS. 10 and 11, 1 is a casing of the kneader, 2 is a kneading chamber, 3 is a rotor for kneading, 4 is a shaft of the rotor 3, 5 is a protrusion of the rotor 3, and 21 is a rotation direction of the rotor 3. , 22 is a dust seal, and 11 is a step provided on the end face of the rotor. Although omitted in FIGS. 10 and 11, other configurations are the same as in the conventional example shown in FIG. 12, and the same kneading operation as in the conventional example is performed.

  The step 11 in FIGS. 10 and 11 is provided in a circular shape at the root portion of the protrusion 5 of the rotor 3, and the gap between the casing 1 and the end surface of the rotor 3 is wide from the root portion to the tip portion of the protrusion 5. Has been.

  10 and 11, even if the kneaded material enters the gap between the protrusion 5 on the end face of the rotor 3 and the casing 1 during the kneading operation, from the root portion to the tip portion of the protrusion 5. Since the gap is wide, the pressure of the infiltrated kneaded product decreases. Therefore, since the kneaded material does not enter the inner portion of the step 11 narrower than the gap and returns to the kneading chamber 2, it is possible to prevent the kneaded material from entering the gap between the casing 1 and the dust seal 22.

  The height difference of the step 11 shown in FIGS. 10 and 11 is appropriately determined in consideration of the resistance when entering the gap, depending on the physical properties of the kneaded material. For example, about 2 mm is appropriate for rubber. Further, the shape of the step 11 is not limited to a circle, and may be provided in a straight line.

  In the kneader according to the other examination example 2, an example in which the step 11 is provided on the end surface of the rotor 3 to widen the gap between the casing 1 and the end surface of the rotor 3 has been described. In the case where a step is provided on the surface to be widened so as to widen the gap, a ring-shaped groove may be formed in a portion corresponding to the locus of the protrusion 5 of the rotor 3 due to the rotation of the rotor 3.

3 is a schematic structural diagram of an end portion of a kneader according to Reference Example 1. FIG. It is the II-II arrow directional view of FIG. FIG. 3 is a view showing an example of a groove arrangement different from those in FIGS. 1 and 2 on the rotor end surface of the kneader according to Reference Example 1. 6 is a schematic structural diagram of an end portion of a kneader according to Reference Example 2. FIG. FIG. 5 is a view taken along line VV in FIG. 4. It is a schematic structure figure of the kneader end concerning other example 1 of examination. It is a VII-VII arrow directional view of FIG. It is a schematic structure figure of the kneader end concerning an embodiment of the invention. It is the IX-IX line arrow directional view of FIG. It is a schematic structure figure of the kneader end concerning other example 2 of examination. FIG. 10 is a view taken along line XI-XI. It is sectional drawing of the conventional common kneading machine. It is a schematic structure figure of the conventional kneader end.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 2 Kneading chamber 3 Rotor 4 Rotor shaft 5 Protruding part 6a, 6b Groove 7 Protruding part 8 Brush-like sealing member 9 Step 10 Inclined surface 11 Step 21 Rotor rotating direction 22 Dust seal

Claims (2)

In a kneader having a casing for containing a kneaded material and a kneading rotor rotating inside the casing, at least one step on the end surface of the rotor or the surface of the casing facing the rotor end surface, and the step An inclined surface that gradually increases from the lower part of the rotor and reaches the top of the step , and the step is formed so as to go from the rotor central part side to the peripheral part, and the inclined surface is the center of the rotor with respect to the radial direction of the rotor. A kneader characterized by being inclined in a direction in which a gap with a casing is widened from the part side to the peripheral part . The step, as kneaded product with the rotation of the rotor is guided to the peripheral direction, according to claim 1, characterized in that is inclined in the rotational direction front side of the rotor to the radial direction of the rotor Kneading machine.

Images