TW202239561A - Kneader - Google Patents

Abstract

The present invention provides a kneader, which suppresses reduction of productivity for forming a rubber dough or reduction of quality of the rubber dough due to a reside dropping from a pressurizing cover after kneading. The kneader comprises a mixing tank 2, which is rotatable to receive a rubber composition with a receiving posture in which an opening 2a opens toward an upper side and to discharge a rubber dough with a discharge posture in which the opening 2a opens toward a lower side; a pressurizing cover 3, which enters the mixing tank 2 in the receiving posture to pressurize the rubber composition and retreats out after kneading; a shaft member 4, which kneads the rubber composition in the mixing tank 2 by means of a rotating blade; and a plate member, which is waiting at a standby position during a period in which the pressurizing cover 3 enters the mixing tank 2 and is moving toward an intervening position between the mixing tank 2 and the pressurizing cover 3 after the pressurizing cover 3 retreats out of the mixing tank 2 and before the mixing tank 2 rotates from the receiving posture toward the discharge posture, and intervenes between the mixing tank 2 and the pressurizing cover 3 at the intervening position before the mixing tank 2 rotates from the receiving posture to the discharge posture to discharge the rubber dough and rotates again back to the receiving posture.

Description

Kneader

The present invention relates to a kneader for kneading a rubber composition to form rubber green stock.

Rubber products are generally produced by adding various additives for forming rubber raw materials such as carbon black, silica, and plasticizers to so-called rubber raw materials such as natural rubber or synthetic rubber and kneading them. Rubber raw material, which is then shaped/hardened into a predetermined shape. As a device for kneading a rubber composition obtained by adding additives for forming rubber raw materials to rubber raw materials in this way, a kneader for forming rubber raw materials is known in the prior art (see, for example, Patent Documents 1 and 2). ). Here, an example of a known kneader will be briefly described.

Fig. 1 is a side view schematically showing a conventional kneader 1' (accurately a part thereof) for kneading a rubber composition to form a rubber raw material.

The conventional kneader 1' shown in Fig. 1 includes or includes: a mixing tank 2, which holds the rubber composition; a pressure cover 3, which pressurizes the contained rubber composition; and a shaft member 4, which pressurizes the rubber The composition is kneaded. The shaft member 4 has blades 4a on its peripheral surface, and rotates around a central axis 4b. The blade 4 a rotates with the rotation of the shaft member 4 to agitate the rubber composition, whereby the rubber composition is kneaded to form rubber raw material.

Fig. 2 is a diagram schematically showing a state in which rubber raw material formed by kneading a rubber composition is discharged.

If the rubber composition is fully kneaded to form rubber raw material, then the pressure cover 3 will withdraw from the mixing tank 2 to the upward direction. After the pressure cover 3 withdraws, as shown in Figure 2, the mixing tank 2 will rotate, and the mixing tank 2 will The rubber raw meal in the container is discharged toward a predetermined rubber raw meal storage container (not shown in the figure). [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Unexamined Patent Publication No. 2006-289233 [Patent Document 2] Specification of Japanese Patent No. 6444683

[Problem to be solved by the invention]

However, on the surface of the pressure cap 3 after the rubber composition is pressurized, residues R such as unkneaded rubber composition (for example, plasticizer) or rubber raw material not discharged after kneading may adhere. Such residue R may fall into the mixing tank 2 in the state after rotation as shown in FIG. In this case, cleaning is required, and there is a disadvantage that the productivity due to rubber raw material is lowered. In addition, when the residue R is a rubber composition remaining without kneading, there is also a disadvantage of being mixed into the rubber raw material being discharged to lower the quality of the rubber raw material.

In view of the above circumstances, the present invention provides a kneader capable of suppressing a decrease in the productivity of rubber raw material formation or a reduction in the quality of rubber raw material due to the residue after kneading falling from the pressurized cover. [Technical means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides the following kneader.

[1] A kneader for kneading a rubber composition to form a rubber raw material, comprising: a mixing tank having an opening and rotating the opening so that the opening direction of the opening is in a predetermined direction Switching between an upward direction and a predetermined downward direction, accommodating the rubber composition in an accommodating posture in which the opening is opened in the predetermined upward direction, and discharging the rubber composition in a discharge posture in which the opening is opened in the predetermined downward direction The rubber raw material kneaded by kneading materials; the pressurized cover, for the mixing tank in the accommodation position, enters the mixing tank through the opening from the direction opposite to the predetermined upward direction to accommodate the rubber in the mixing tank. The composition is pressurized, and after the rubber composition is kneaded, it exits from the mixing tank toward the predetermined upward direction through the opening; the shaft member is provided in the mixing tank and has a direction away from the central axis on the peripheral surface The blade protruding in the direction and rotating around the central axis stirs the rubber composition contained in the mixing tank and pressurized by the pressure cover by the rotating blade, thereby kneading the rubber composition and forming the rubber raw material; and a plate-shaped member extending in a plane intersecting the predetermined upward direction, during the period when the pressurized cover enters the mixing tank, away from the pressurized cover and the Standby at a predetermined standby position of the mixing tank, after the press cover is withdrawn from the mixing tank and before the mixing tank is rotated from the receiving position to the discharge position, in the plane from the standby position toward the mixing tank and the charging position. The intervening position between the glands is moved during the rotation of the mixing tank from the storage position to the discharge position to discharge the rubber raw material and after discharging the rubber raw material, from the discharge position to the storage position, Then, the intervening position is interposed between the mixing tank and the pressurizing cover, and after the mixing tank is rotated from the discharge position to the storage position, it moves in the plane from the intervention position toward the standby position.

[2] The kneader according to [1], which further includes a stand for supporting the plate-shaped member at the standby position.

[3] The kneader according to [1] or [2], which further includes an air cylinder having a cylindrical frame body and a rod whose front end is fixed to the plate-shaped member and can freely enter and exit from the frame body body, and the plate-shaped member moves between the standby position and the intervention position by moving the rod body in and out.

[4] The kneader according to [3], wherein the plate-shaped member reaches the intervening position when the rod extends out of the frame part to the maximum, and the kneader includes a first sensor that detects the Whether the rod body has been stretched out from the frame part to the maximum extent, the mixing tank is rotated from the containing position to the discharge position when the first sensor detects that the rod body is stretched out from the frame part to the maximum .

[5] The kneader according to [3] or [4], wherein the plate-shaped member reaches the standby position when the rod enters the frame part to the maximum, and the kneader includes a second sensor, It detects whether the rod body has entered into the frame part as far as possible, and when the second sensor detects that the rod body has entered into the frame part as far as possible, the press cover starts to move toward the mixing tank to again into the mixing tank. [Effect of Invention]

In the kneader of the present invention, after kneading, the plate-shaped member is interposed between the mixing tank and the pressure cover, thereby preventing the residue falling from the pressure cover from reaching the vicinity of the mixing tank from which the rubber raw material is discharged. Therefore, in the present invention, it is possible to suppress a reduction in the productivity of rubber raw material formation or a reduction in the quality of rubber raw material due to falling of the residue.

Embodiments of the present invention will be described below with reference to the drawings. In addition, the present invention is not limited to the following examples, and it should be understood that design changes, improvements, etc. can be appropriately added according to the common knowledge of those skilled in the art without departing from the gist of the present invention.

In addition, in the following description, "rubber composition" refers to a so-called rubber raw material such as natural rubber or synthetic rubber mixed with various additives for forming rubber raw materials such as carbon black, silica, and plasticizers, and the composition components are not included. Uniform state. In other words, "rubber composition" is only an aggregate of various rubber materials. By kneading this "rubber composition", a "rubber raw material" with a uniform composition is formed.

Fig. 3 is a structural diagram schematically showing the structure of a kneader 1 according to an embodiment of the present invention from the front.

The kneader 1 is a device for kneading a rubber composition to form a rubber raw material, and includes a mixing tank 2 , a pressure cover 3 , a shaft member 4 and a plate member 5 . In addition, in FIG. 3, the same code|symbol is attached|subjected to the component similar to FIG.

The mixing tank 2 has an opening 2a, and as described below, the opening direction of the opening 2a can be switched between a predetermined upward direction and a predetermined downward direction by rotating. The mixing tank 2 accommodates the rubber composition with the opening 2a opening in a predetermined upward direction, and discharges rubber raw material kneaded from the rubber composition in a discharge posture with the opening 2a opening in a predetermined downward direction. FIG. 3 shows the mixing tank 2 in the accommodation posture, and the rubber composition is accommodated in the mixing tank 2 . In addition, FIG. 3 shows the front aspect of the mixing tank 2, and the above-mentioned FIG. 1 shows the side aspect of the mixing tank 2. As shown in FIG.

Here, the "predetermined upward direction" means that the opening direction of the opening 2a includes a vertically upward component, and the content (specifically, the rubber composition) accommodated in the mixing tank 2 does not flow out from the opening 2a and is stable. Keep in the direction of the opening 2a in the mixing tank 2. A typical "predetermined upward direction" is a vertically upward direction as shown in FIG. 3 . However, this is only a typical embodiment, and the "predetermined upward direction" in the present invention may also be an oblique upward direction satisfying the above definition. On the other hand, "predetermined downward direction" means that the opening direction of the opening part 2a includes components facing vertically downward, and the content (specifically, rubber raw material) accommodated in the mixing tank 2 flows out from the opening part 2a. The direction of the opening 2a. The mixing tank 2 in the discharge posture in which the opening 2a opens in a predetermined downward direction will be described below.

The pressurizing cover 3 enters into the mixing tank 2 through the opening 2a from the direction opposite to the above-mentioned predetermined upward direction (in FIG. 3 , the vertically upward direction) with respect to the mixing tank 2 in the storage posture, and is accommodated in the mixing tank 2. A rubber composition pressurized member. As described below, after the rubber composition is kneaded, the pressure cap 3 exits from the mixing tank through the opening 2a toward the aforementioned predetermined upward direction (vertical upward direction in FIG. 3 ). Here, FIG. 3 shows the front side of the pressure cap 3 that enters the mixing tank 2 and pressurizes the rubber composition in the mixing tank 2. The above-mentioned FIG. 1 shows the side view of the pressure cap 3. appearance.

The shaft member 4 is provided in the mixing tank 2, and has a blade 4a protruding in a direction away from the central axis 4b on the peripheral surface and rotating around the central axis 4b. The shaft member 4 stirs the rubber composition accommodated in the mixing tank 2 and pressurized by the pressure cover 3 by the rotating blade 4a, thereby kneading the rubber composition to form rubber raw material. Here, FIG. 3 shows the front side of the shaft member 4. The shaft member 4 shown in FIG.

The plate-shaped member 5 is a plate-shaped member developed in a plane intersecting the above-mentioned predetermined upward direction (the vertically upward direction in FIG. 3 ). While the pressure cap 3 enters the mixing tank 2, the plate member 5 stands by at a predetermined standby position away from the pressure cap 3 and the mixing tank. FIG. 3 shows the plate-shaped member 5 at the predetermined standby position, and the above-mentioned plane is along the plane of the plate-shaped member 5 at the predetermined standby position.

In the kneader 1, as shown in FIG. 3 , the rubber composition accommodated in the mixing tank 2 is pressurized by the shaft member 4 in a state where the press cover 3 enters the mixing tank 2 to pressurize the rubber composition, and the rubber composition is kneaded by the This kneading forms the rubber raw material. When the kneading is sufficiently performed to form rubber raw material, the rotation of the shaft member 4 is stopped, and the pressure cap 3 is withdrawn from the mixing tank 2 through the opening 2 a. In addition, for example, whether the kneading is sufficiently performed can be determined by: whether the number of rotations of the shaft member 4 exceeds a preset threshold number of times; whether the duration of kneading by the rotation of the shaft member 4 exceeds a preset threshold time.

FIG. 4 is a front view schematically showing the state of the kneader 1 after the pressure cap 3 is withdrawn from the mixing tank 2 and before the mixing tank 2 is rotated from the storage position to the discharge position.

If the pressure cover 3 withdraws from the mixing tank 2 and moves in the direction of the dotted arrow in Fig. 4 in the vertical upward direction away from the mixing tank 2, then as shown in Fig. 4, the plate member 5 moves from the standby position in Fig. Move toward the intervening position between the mixing tank 2 and the pressure cover 3 in the direction of the thick arrow in FIG. 4 . When the plate member 5 reaches the intervening position, the mixing tank 2 is rotated from the storage position shown in FIG. 3 and FIG. 4 to the discharge position.

Fig. 5 is a diagram schematically showing the state of the kneader 1 when the mixing tank 2 is rotated from the accommodation posture in Fig. 3 and Fig. 4 to the discharge posture from the front, and Fig. 6 is a diagram schematically showing the kneader 1 in the discharge posture to discharge rubber from the side A diagram of the state of the kneader 1 (accurately, a part thereof) in the raw material.

Here, in FIG. 6, the mixing tank 2, the pressure cover 3, the shaft member 4, and the plate-shaped member 5 are selected from the configuration of the kneader 1 of FIG. 5 viewed from the front side only, and the side surfaces thereof are shown.

As shown in Figure 5, when the mixing tank 2 starts to rotate from the accommodation position of Figure 3 and Figure 4 towards the discharge position of Figure 6 according to the direction of the thick arrow in Figure 5, the plate member 5 has been positioned between the mixing tank 2 and the pressure cover. 3 intervening positions. Then, as shown in FIG. 6 , the plate member 5 is also interposed between the mixing tank 2 and the pressure cover 3 at this intervening position during the discharge of the rubber raw material by the kneader 1 in the discharge position. In this way, the state where the plate member 5 is interposed between the mixing tank 2 and the pressurizing cover 3 continues until the mixing tank 2 discharges the rubber raw material and then rotates from the discharge position in FIG. 6 to return to the storage position in FIG. 3 . Therefore, the plate-shaped member 5 rotates from the storage position of FIGS. 3 and 4 to the discharge position of FIG. 6 in the mixing tank 2 to discharge the raw rubber and then rotates back to the discharge position of FIGS. 3 and 6 after discharging the raw rubber. During the accommodation position of FIG. 4 , in the intervening position between the mixing tank 2 and the pressure cover 3 .

In this way, in the kneader 1 of this embodiment, the plate-shaped member 5 is interposed between the mixing tank 2 and the pressure cover 3 after kneading, thereby preventing the residue R falling from the pressure cover 3 from reaching the rubber being discharged. Near the mixing tank 2 for raw meal. As a result, in the kneader 1 , it is possible to suppress a reduction in the productivity of rubber raw material formation or a reduction in the quality of the rubber raw material due to the fall of the residue R.

FIG. 7 is a front view schematically showing the state of the kneader 1 after the mixing tank 2 has been rotated from the discharge position in FIG. 6 to the storage position in FIGS. 3 and 4 .

If the mixing tank 2 is rotated back to the receiving posture of Fig. 3 and Fig. 4 from the discharge posture of Fig. 6, then as shown in Fig. The intervention position moves toward the standby position shown in FIG. 3 .

Fig. 8 is a front view schematically showing the state of the kneader 1 after the plate-shaped member 5 of Fig. 7 reaches the standby position of Fig. 3 .

If the plate member 5 in FIG. 7 reaches the standby position in FIG. 3 , as shown in FIG. 8 , the pressure cover 3 moves toward the mixing tank 2 in the direction of the dotted arrow in FIG. 8 . Simultaneously, a new rubber composition is supplied to the mixing tank 2 and is kneaded by the rotating shaft member 4 while being pressurized by the pressurizing cover 3 entering the mixing tank 2 .

The above is a description of the mixing tank 2 , the pressure cover 3 , the shaft member 4 and the plate-shaped member 5 which are the constituent elements of the kneader 1 . Other constituent requirements are described below.

In the kneader 1 of the present embodiment, as shown in Fig. 3 to Fig. 5, Fig. 7 and Fig. 8, it is preferable to include a speed reducer 6, which is interposed between the mixing tank 2 and the rotary drive mechanism not shown in the figure ( motor, etc.), convert the rotational driving force obtained from the rotational driving mechanism into a rotational driving force that reduces the rotational speed, and supply it as the rotational driving force required for switching the position of the mixing tank 2 between the storage position and the discharge position. to mix tank 2.

With such a speed reducer 6, it is possible to switch the posture of the mixing tank 2 between the storage posture and the discharge posture at an appropriate rotation speed and even an appropriate rotation angle.

Again, in the kneader 1 of the present embodiment, the kneader 1 shown in Figure 3 preferably includes a dustproof cover 7, which is located above the mixing tank 2, except that the pressure cover 3 enters the mixing tank 2 (refer to 3 ), as shown in FIG. 4 , FIG. 5 , FIG. 7 and FIG. 8 , it surrounds the periphery of the pressure cap 3 .

By including such a dustproof cover 7 , it is difficult for external dust to enter the mixing tank 2 from around the pressure cover 3 . In addition, FIGS. 3 to 5 , 7 and 8 show, as an example, the dust cap 7 that moves together with the pressure cap 3 when the pressure cap 3 moves out of the mixing tank 2 .

Other constituent elements of the kneader 1 related to the plate-shaped member 5 will be described below.

In the kneader 1 of this embodiment, the kneader 1 shown in FIG. 3 preferably includes a stand 8 that supports the plate-shaped member 5 at the standby position.

By including such a stand 8, the attitude|position of the plate-shaped member 5 in a standby position is stabilized. In addition, Fig. 3 to Fig. 5, Fig. 7 and Fig. 8 show the stand 8 arranged on the reducer 6 as an embodiment.

In addition, the kneader 1 of the present embodiment preferably includes an air cylinder 9 having a cylindrical frame portion 9a and a rod body 9b whose front end portion 90 is fixed to the plate member 5 and freely enters and exits from the frame portion 9a. , the plate member 5 is moved between the standby position in FIG. 3 and the intervention position in FIG. 4 by the rod body 9b moving in and out.

By including such an air cylinder 9, the plate member 5 can easily be driven between the standby position of FIG. 3 and the intervention position of FIG.

Also, in the kneader 1 comprising the air cylinder 9, when the rod body 9b stretches out from the frame part 9a to the maximum, the plate member 5 reaches the intervening position shown in Fig. 4 and Fig. 5, and the kneader 1 preferably includes 5. The first sensor 10 detects whether the rod body 9b has stretched out of the frame part 9a to the maximum extent. When the first sensor 10 of the mixing tank 2 detects that the rod body 9b has stretched out of the frame part 9a to the maximum extent , Rotate from the storage position in Figure 3 and Figure 4 to the discharge position in Figure 6.

By including such a first sensor 10 and performing rotation of the mixing tank 2, the mixing tank 2 is rotated from the storage position to the discharge position after the plate member 5 has fully reached the intervention position. As a result, the residue R in FIG. 6 falling from the pressure cap 3 is reliably prevented from reaching the vicinity of the mixing tank 2 where the rubber raw material is being discharged. Moreover, as such a 1st sensor 10, for example, the position sensor which detects the end position of the rod body 9b on the side opposite to the front-end|tip part 90 in the frame body part 9a can be used.

Also, in the kneader 1 including the air cylinder 9, when the rod body 9b enters the frame body part 9a to the maximum extent, the plate-like member 5 reaches the standby position shown in FIG. , the kneader 1 preferably includes the second sensor 11 of FIG. 8, and when the second sensor 11 detects that the rod body 9b enters the frame part 9a to the maximum extent, the pressure cover 3 starts to move toward the mixing tank 2 moves to enter the mixing tank 2 again.

By including such a second sensor 11, after the plate-like member 5 has fully reached the standby position, the pressurizing cover 3 moves toward the mixing tank 2, so that the plate-like member 5 prevents the pressurizing action performed by the pressurizing cover 3 .

In addition, although not shown in FIG. 3 to FIG. 8 , it is preferable to include a control unit for controlling the actions of the various units illustrated in FIG. 3 to FIG. 8 . By including such a control unit, the operations of the respective units in FIGS. 3 to 8 are automatically performed.

The above is the description of this embodiment.

In the above description, an example in which the kneader 1 of this embodiment is applied to kneading a rubber composition for forming rubber raw materials is described, but the present invention can also be applied to other than kneading for forming rubber having the same physical properties as rubber raw materials. Resin material for all resin materials. [industrial availability]

The present invention is very useful for suppressing a decrease in the productivity of rubber raw meal formation or a reduction in the quality of rubber raw meal due to falling of the residue after kneading.

1: kneader 1': kneader 2: Mixing tank 2a: Opening 3: Pressure cover 4: shaft member 4a: blade 4b: Central axis 5: Plate member 6: reducer 7: Dust cover 8: Stand 9: Cylinder 9a: frame part 9b: rod body 10: The first sensor 11:Second sensor 90: front end R: residue

Fig. 1 is a side view schematically showing a conventional kneader (accurately a part thereof) for kneading a rubber composition to form a rubber raw material. Fig. 2 is a diagram schematically showing a state in which rubber raw material formed by kneading a rubber composition is discharged. Fig. 3 is a structural view schematically showing the structure of a kneader according to an embodiment of the present invention from the front. Fig. 4 is a front view schematically showing the state of the kneader after the pressurized lid is withdrawn from the mixing tank and before the mixing tank is rotated from the storage position to the discharge position. Fig. 5 is a front view schematically showing the state of the kneader when the mixing tank starts to rotate from the storage position in Figs. 3 and 4 to the discharge position. Fig. 6 is a diagram schematically showing the state of the kneader (accurately a part thereof) when the kneader in the discharge posture discharges rubber raw material from the side. Fig. 7 is a front view schematically showing the state of the kneader after the mixing tank has been rotated from the discharge position in Fig. 6 to the storage position in Fig. 3 and Fig. 4 . Fig. 8 is a diagram schematically showing the state of the kneader after the plate-like member in Fig. 7 reaches the standby position in Fig. 3 from the front.

1: kneader

2: Mixing tank

2a: Opening

3: Pressure cover

4: shaft member

5: Plate member

6: reducer

7: Dust cover

8: Stand

9: Cylinder

9a: frame part

9b: rod body

90: front end

Claims (5)

A kneader, which kneads a rubber composition to form a rubber raw material, which includes: A mixing tank, which has an opening, and the mixing tank is rotated so that the opening direction of the opening is switched between a predetermined upward direction and a predetermined downward direction, by making the opening toward the Predetermined to open in an upward direction to form an accommodating posture for accommodating the rubber composition, and to form a discharge posture by making the opening open toward the predetermined downward direction for discharging rubber raw material kneaded by the rubber composition. material; a pressurizing cap for pressurizing the rubber composition accommodated in the mixing tank by entering the mixing tank from a direction opposite to the predetermined upward direction through the opening to pressurize the mixing tank in the storage position; After the rubber composition is kneaded, it exits from the mixing tank toward the predetermined upward direction through the opening; A shaft member, which is installed in the mixing tank, has blades protruding away from the central axis on the peripheral surface and rotating around the central axis, and the blades are accommodated in the mixing tank and passed through the mixing tank by rotating. Stirring the rubber composition pressurized by the pressure cover, whereby the rubber composition is kneaded to form the rubber raw material; and a plate-shaped member extending on a plane intersecting the predetermined upward direction and standing by at a predetermined standby position away from the pressurizing cover and the mixing tank during the entry of the pressurizing cover into the mixing tank, moving on the plane from the standby position towards an intervening position between the mixing tank and the pressurizing cover after the pressurizing cover is withdrawn from the mixing tank and before the mixing tank is rotated from the containing position to the discharging position , when the mixing tank is rotated from the storage position to the discharge position to discharge the rubber raw material and after the rubber material is discharged, it is rotated back to the storage position from the discharge position, then it is located between the mixing tank and the At the intervening position between the pressure caps, after the mixing tank is rotated from the discharge position to the storage position, it moves on the plane from the intervening position toward the standby position. The kneader according to claim 1, further comprising a stand supporting the plate-shaped member at the standby position. The kneader as described in claim 1, which further includes a cylinder, the cylinder has a cylindrical frame part and a rod body, and the rod system is fixed to the plate-shaped member with a front end, and can enter and exit freely. The frame part protrudes from the frame part, and the plate-shaped member can move between the standby position and the intervention position through the rod body entering and leaving the frame part. The kneader according to claim 3, wherein the plate-shaped member reaches the intervening position when the rod extends from the frame part to the maximum, The kneader includes a first sensor for detecting whether the rod has been stretched out from the frame part to the maximum, The mixing tank is configured to rotate the mixing tank from the accommodating posture to the discharging posture when the first sensor detects that the rod body has protruded from the frame portion to the maximum. The kneader according to claim 3, wherein when the rod enters the frame part to the maximum, the plate-shaped member reaches the standby position, The kneader includes a second sensor for detecting whether the rod has entered the frame portion to the maximum extent, When the second sensor detects that the rod body has entered the frame part to the maximum, the press cover starts to move toward the mixing tank to enter the mixing tank again.

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