JP5792116B2 - Twin screw kneading extruder - Google Patents

Description

  The present invention relates to a twin-screw kneading extruder.

  The biaxial kneading extruder is an apparatus that kneads resin materials such as PE and PP while melting them and extrudes the kneaded resin. Specifically, two kneading rotors (kneading screws) for kneading the resin are rotatably accommodated in a barrel having a hollow inside. In order to rotate the two kneading rotors, a drive unit is provided on one end side (drive end side) of the kneading rotor. The rotational driving force generated by the drive unit is transmitted to the kneading rotor via a speed reducer, and the kneading rotor is rotated to knead a material such as resin.

These kneading rotors and barrels that accommodate the kneading rotors are attached to a frame member, and this frame member is directly fixed to a concrete foundation base with a fastener such as an anchor bolt. Yes.
However, when a material such as a resin is kneaded with such a twin-screw kneading extruder, a periodic vibration force is generated in the kneading portion. In the conventional biaxial kneading extruder, a strong integral frame member is used to suppress the excitation force (vibrating force acting on the biaxial kneading extruder). However, in recent years, there has been a need for cost reduction and weight reduction for the twin-screw kneading extruder, and it has been reduced in weight and coped with low cost in place of the high-cost solid integrated frame member. A frame member is used. Even in a biaxial kneading extruder using a plurality of such lightened frame members, the excitation force is suppressed by using the technique disclosed in Patent Document 1.

  In Patent Document 1, at least one frame member that rotatably supports the kneading rotor with respect to the kneading rotor that rotates in the barrel is provided, and the frame member is fixed to the vibration reducing member embedded in the foundation base. It is characterized by being. Preferably, the frame member has two or more drive-side frame members that support the kneading rotor on the drive side, or includes a leg portion branched into two or more on the foundation base side. It is more preferable that members or legs are connected to each other via a vibration reducing member.

  If it does in this way, the exciting force concerning a frame member can be controlled.

JP 2010-179562 A

However, in recent years, an unprecedented large excitation force has been generated with the development of the optimal screw shape to ensure the kneading performance of diversifying resin materials and the enlargement of the device for the purpose of reducing production costs. Cases are also coming out. There is a problem that such a large excitation force affects the device life of the twin-screw kneading extruder.
Therefore, the inventors of the present application supported at two points on one end side (drive end side, DE) of the kneading rotor and supported at one point on the other end side (water end side, WE) of the kneading rotor. An analysis prediction (analysis simulation) was performed to generate an excitation force with a twin-screw kneading extruder having a structure. As a result of the analysis simulation, the inventors of the present application have found that a large vibration is generated also on the DE side.

  In order to suppress the excitation force, the DE-side frame member is connected to the vibration reduction member embedded in the foundation base, as in Patent Document 1, so that the frame is integrated with the vibration reduction member. The rigidity of the member is improved and vibration can be suppressed. Further, if the vibration reducing member is embedded in the foundation foundation, the frame member itself of the kneading machine can be reduced in weight, so that the kneading machine can be reduced in cost.

However, when the excitation force is large, the vibration of the DE-side frame member cannot be suppressed only by the technique of Patent Document 1.
In addition, in the case of vibration countermeasures using a dynamic vibration absorber or the like, there is a problem that an increase in cost due to an increase in the number of parts is unavoidable, and performance tuning and the like become large.
The present invention has been made in view of the above-described problems. Even when the excitation force is large, the drive unit side (DE side) is provided by reinforcing the vibration member only at the necessary portion of the frame member. It is an object of the present invention to provide a twin-screw kneading extruder that can suppress vibrations of the frame member and the kneading rotor supported by the frame member at low cost and can easily perform installation and maintenance work.

In order to achieve the above-described object, the present invention takes the following technical means.
A twin-screw kneading extruder according to the present invention includes a barrel having a hollow inside, a pair of left and right kneading rotors inserted into the barrel, and a drive unit that rotates the kneading rotor. In the twin-screw kneading and extruding machine provided with at least three frame members that are rotatably supported in the axial direction of the kneading rotor, two of the at least three frame members are arranged on the drive unit side. In addition, the two frame members are provided with a vibration reducing member that reduces vibration due to an excitation force generated by the rotation of the kneading rotor, and the vibration reducing member is an upper part of the two frame members. It is characterized by being fastened so that it may span.

Preferably, the vibration reducing member may be fastened so that the upper portions of the two frame members intersect each other.
Preferably, the vibration reducing member is fastened at either the upper surface of the frame member or the upper portion of the side surface of the frame member.
Preferably, the vibration reducing member may be integrally formed in a cross shape.
The most preferred embodiment of the twin-screw kneading extruder of the present invention includes a barrel having a hollow inside, a pair of left and right kneading rotors inserted into the barrel, and a drive unit that rotates the kneading rotor. In the twin-screw kneading extruder provided with at least three frame members that rotatably support the kneading rotor in the axial direction of the kneading rotor, the at least three frame portions
Among the materials, two frame members are provided on the drive unit side, and the two frame members are provided with a vibration reducing member that reduces vibration due to the excitation force generated by the rotation of the kneading rotor. The vibration reducing member is fastened so as to span the upper portions of the two frame members and to cross each other.

  According to the present invention, the vibration of the frame member disposed on the drive unit side and the kneading rotor supported by the frame member can be suppressed at a low cost by reinforcing the vibration member only at the necessary portion of the frame member. Installation and maintenance work can be done easily.

It is the figure which showed the connection structure of the cross section of the support structure of the biaxial kneading extruder of this invention, and a vibration reduction member. It is the figure which showed the vibration mode of the biaxial kneading extruder. It is the figure which showed the deformation | transformation state of the frame member. It is the figure which showed the connection state of the frame member typically. (Case 1) It is the figure which showed the connection state of the frame member typically. (Case 2) It is the figure which showed the connection state of the frame member typically. (Case 3) It is the figure which showed the horizontal direction vibration speed in the bearing position arrange | positioned in a frame member.

Hereinafter, an embodiment of a biaxial kneading extruder 1 according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, a twin-screw kneading extruder 1 (hereinafter also referred to as a kneading machine 1) includes a barrel 2 whose inside is hollow along a horizontal direction, and a pair of left and right insertable in the barrel 2. The kneading rotor 3 (kneading screw) and a drive unit 4 that rotationally drives the kneading rotor 3 are configured.

A first frame member 5 is installed on one side (right side in FIG. 1) of the barrel 2 so that one surface of the barrel 2 and the other surface of the first frame member 5 are in close contact with each other. It is connected.
On the one side of the first frame member 5, that is, the side away from the barrel 2, a second frame member 6 is installed at a predetermined distance in the horizontal direction from the first frame member 5.

Between the 1st frame member 5 and the 2nd frame member 6, the connection member 7 in which the hole which the axial part of a kneading screw penetrates was formed is arranged, and by passing through this connection member 7, the 1st The 1 frame member 5 and the 2nd frame member 6 are connected integrally.
Furthermore, a drive unit 4 for rotating the kneading rotor 3 is provided on one side of the second frame member 6 (the right side in FIG. 1 and farthest from the barrel 2). The rotor 3 is directly connected. The rotational driving force generated by the drive unit 4 is transmitted to the kneading rotor 3, and the kneading rotor 3 is driven to rotate. Thus, the kneader 1 kneads the resin material such as PE or PP while melting by rotating the pair of left and right kneading rotors 3.

  On the other hand, a third frame member 8 is provided on the other side of the barrel 2 (on the left side in FIG. 1 and opposite to the first frame member 5). It connects so that the surface of the other side of 2 may closely_contact | adhere. The third frame member 8 is provided with a cooling water supply unit 9 for introducing cooling water for adjusting the temperature of the kneading rotor 3. The three frame members described above are installed upright on a foundation base M having a horizontal surface.

In this way, if the two kneading rotors 3 inserted into the barrel 2 are divided and supported by a plurality of frame members (three in this embodiment), a space is formed between the frame members. Therefore, the weight of the kneader 1 can be reduced, and the cost of the kneader 1 can be reduced.
Hereinafter, the configuration of the biaxial kneading extruder 1 will be described in detail.

  In the description, the right side (one side) of FIG. 1 is the drive end side (DE side) when explaining the kneading machine 1, and the left side (other side) of the paper is the water end side (WE side). To do. The direction along the rotation axis of the kneading rotor 3 (the direction along the left and right sides of the paper surface) is referred to as the axial direction when describing the kneading machine 1, and the direction along the front and back of the paper surface is described with respect to the kneading machine 1. This is called the right and left direction. Furthermore, the upper side and the lower side of the paper surface of FIG.

  First, the barrel 2 has a long cylindrical shape, and a glass-hole-like cavity (a pair of left and right circular holes) is formed inside with its axis oriented in the horizontal direction. The barrel 2 of the present embodiment is configured by connecting three cylindrical members in the horizontal direction. Specifically, the cylindrical member constituting the first screw chamber 10 for feeding the inserted material, the cylindrical member constituting the kneading chamber 11 for melting and kneading the material, and the second screw for discharging the kneaded material to the outside. It is comprised with the cylinder member which comprises the chamber 12. FIG. By connecting these three cylindrical members, an integral barrel 2 is obtained.

A hopper 13 (funnel type mouth) is provided in the upper part of the first screw chamber 10. A material such as resin inserted from the hopper 13 passes through the first screw chamber 10 by the rotation of the first screw blade portion 14 of the kneading rotor 3 described later, and is sent out to the kneading chamber 11.
A barrel 2 support member is formed in the middle of the kneading chamber 11 so as to protrude downward. This barrel 2 support member is formed in a flange shape at the lower end side, and is directly fixed to a concrete base M with a fastener S such as an anchor bolt or an inverted L-shaped rail-shaped fixture. On the water end side (the other side) of the kneading chamber 11, a gate type that adjusts the degree of kneading of the material by opening and closing the flow path of the material formed between the inner peripheral surface of the kneading chamber 11 and the kneading rotor 3. The kneading degree adjusting unit 17 is provided. A pair of kneading rotors 3 is rotatably provided in the hollow portion.

A pair of kneading rotors 3 inserted into the barrel 2 is provided in the left-right direction so as to penetrate the inside of the barrel 2 in the axial direction. Each kneading rotor 3 has a kneading blade portion 18 (rotor portion), a first screw blade portion 14 and a second screw blade portion 15 in the middle in the axial direction.
The kneading blade 18 is disposed at a position corresponding to the kneading chamber 11 of the barrel 2. The kneading blade 18 has a blade suitable for mixing materials, and is configured to knead the material in the kneading chamber 11.

  Further, the first screw blade portion 14 is disposed at a position corresponding to the first screw chamber 10. The second screw blade 15 is disposed at a position corresponding to the second screw chamber 12. In other words, the first screw blade portion 14 and the second screw blade portion 15 are arranged at positions where the kneading blade portion 18 is sandwiched. Each screw blade portion is formed with a twisted blade along the axial direction so that the material can be fed toward the water end side.

The kneading rotor 3 sends the material to the kneading chamber 11 using the first screw blade portion 14, kneads the kneading chamber 11 using the kneading blade portion 18, and kneads the material kneaded using the second screw blade portion 15. It is configured to send to the water end side.
At the end of the kneading rotor 3 on the drive end side, a drive unit 4 for rotating the kneading rotor 3 is provided. Although not shown in the inside of the drive unit 4, a drive motor that generates a rotational drive force and a speed reducer that distributes the rotational drive force generated by the drive motor toward the pair of kneading rotors 3 while decelerating the rotational drive force. It consists of and. The drive unit 4 is configured to distribute the rotational driving force inside and output the distributed rotational driving force from the two power transmission shafts 19. Between the power transmission shaft 19 and the kneading rotor 3, a coupling 20 for transmitting a rotational driving force is provided.

The kneading rotor 3 on the drive end side from the first screw blade portion 14 is formed as a straight cylindrical shaft portion. The cylindrical shaft portion is provided with a plurality of bearing portions 21 (two in the present embodiment) that rotatably support the kneading rotor 3.
The kneading rotor 3 on the water end side from the second screw blade portion 15 is formed as a straight cylindrical shaft portion. A bearing portion 21 that rotatably supports the kneading rotor 3 is provided on the cylindrical shaft portion. At the end of the kneading rotor 3 on the water end side, a cooling water supply unit 9 for sending cooling water to the inside of the kneading rotor 3 is provided. By supplying cooling water from the cooling water supply unit 9 to the inside of the kneading rotor 3, the temperature of the kneading rotor 3 can be adjusted.

The barrel 2 into which the pair of kneading rotors 3 are inserted is connected to and supported by a plurality of frame members.
A first frame member 5 (DE 1) and a second frame member 6 (DE 2) are integrally connected to the barrel 2 on the drive end (DE) side via a connecting member 7. The third frame member 8 (WE3) is connected to the end (WE) side. The first frame member 5 is directly connected to the end face on the drive end side of the barrel 2, and the second frame member 6 is located slightly away from the first frame member 5 (for example, an interval of about 1 to 1.5 m). Is arranged. The distance between the second frame member 6 and the first frame member 5 varies depending on the dimensions of the biaxial kneading extruder 1.

  A connecting member 7 is provided between the first frame member 5 and the second frame member 6. The connecting member 7 integrally connects the first frame member 5 and the second frame member 6 in the axial direction. The connecting member 7 is formed in a cylindrical shape so that the kneading rotor 3 can be inserted into the cylinder. The second frame member 6 is connected to the end surface on the drive end side of the connecting member 7, and the first frame member 5 is connected to the end surface on the water end side of the connecting member 7.

A shaft hole is formed in the upper side of the first frame member 5 and the second frame member 6 along the horizontal (axial center) direction so that the straight cylindrical portion of the kneading rotor 3 can be inserted. Moreover, the bearing part 21 which rotatably supports the kneading rotor 3 is provided on the inner peripheral surface of the shaft hole.
Legs are provided on the lower ends of the first frame member 5 and the second frame member 6 from the kneading rotor 3 side (upper side) toward the foundation foundation M side (lower side). The lower end of the leg is formed in a flange shape and can be fixed to the foundation base M using a plurality of fasteners S (for example, anchor bolts).

On the other hand, the third frame member 8 is directly connected to the water end side end surface of the barrel 2.
A shaft hole is formed on the upper end side of the third frame member 8 along the horizontal (axial center) direction so that the straight cylindrical portion of the kneading rotor 3 can be inserted. Moreover, the bearing part 21 which rotatably supports the kneading rotor 3 is provided on the inner peripheral surface of the shaft hole.

Each of the first frame member 5 to the third frame member 8 described above is arranged upright on a horizontal foundation foundation M, and is directly anchored to the foundation foundation M of concrete or an inverted L-shape. It is being fixed with fasteners S, such as a rail-shaped fixing tool. The first frame member 5 to the third frame member 8 support a static load and a dynamic load applied to the kneading rotor 3 and the barrel 2 with respect to the foundation base M. Further, the entire length (full length) of the biaxial kneading / extruding machine 1 between the second frame member 6 and the third frame member 8, that is, the biaxial kneading extruder 1 of the present embodiment is about 7 m. In addition, as long as the whole length (full length) of the biaxial kneading extruder 1 is the range of the biaxial kneading extruder normally implemented by those skilled in the art, any length may be sufficient. For example, the length may be about 10 m.

As shown in FIG. 1, if the static load and the dynamic load applied to the kneading rotor 3 and the barrel 2 are divided and supported by a plurality of frame members (first frame member 5 to third frame member 8), the space between the frame members A space is formed in the frame, and the weight of the frame member and the weight of the kneader 1 can be reduced.
However, in recent years, with the development of the optimal screw shape to ensure the kneading performance of diversifying resin materials and the enlargement of the device for the purpose of reducing the production cost, unprecedented large excitation force (biaxial) In some cases, a vibration force acting on the kneading extruder 1 is generated. There is a problem that such a large excitation force affects the device life of the twin-screw kneading extruder 1. In particular, the frame members (first frame member 5 and second frame member 6) on the drive end side are reduced in size to reduce weight and are easily affected by vibration of the kneading rotor 3. As a result, the frame members 5 and 6 on the drive end side are bent, and there is a possibility that a large load is applied to each member such as the bearing portion 21.

In order to find a solution to such a problem, the inventors of the present application conducted a numerical analysis of the vibration of the kneading rotor 3 through computer simulation.
FIG. 2 is a diagram showing the results obtained by analyzing the vibration when the kneading rotor 3 is rotating by computer simulation.
As shown in FIG. 2, regarding the vibration state of the biaxial kneading extruder 1, the vibration between the third frame member 8 (WE3) and the first frame member 5 (DE1) is large. Oscillate in the same phase at any position in the axial direction. Looking at each part, the third frame member 8 (WE3) and the first frame member 5 (DE1) vibrate in the same phase, and the first frame member 5 (DE1) and the second frame member 6 (DE2). It was found that it vibrates in the opposite phase.

  As shown in FIG. 3, when the biaxial kneading rotor 3 kneads the resin, the reaction force of the kneading rotor 3 is transmitted to the frame member via the bearing portion 21. Therefore, a force acts on a specific position of the bearing (the position indicated by the arrow in FIG. 3). Since the lower part of the frame member is fixed to the foundation base M and is in a cantilever state, it was also confirmed that the vibration displacement on the upper end side (upper part) of the frame member was large.

  Further, as shown in Table 1, the vibration of the kneading rotor 3 is larger than the vibration in the vertical direction from the result of measuring the vibration of the existing biaxial kneading extruder 1 (actual machine). (RMS vibration speed ratio> 1) was also confirmed. In Table 1, DE1 indicates the first frame member 5, and DE2 indicates the second frame member 6. WE indicates the third frame member 8.

  In order to suppress such vibration, in the case of the third frame member 8, it is common to strengthen the third frame member 8 itself or use a dynamic vibration absorber (absorber, damper) or the like. It is. However, in the case of the 1st frame member 5 and the 2nd frame member 6, it is in the state which vibrates with an antiphase. Therefore, the above-described general vibration countermeasures are difficult to apply realistically because they are expensive and have a problem in maintainability. For example, the respective dynamic vibration absorbers are required for the two frames 5 and 6 on the DE side.

Accordingly, the inventors of the present application have made extensive studies, and connect the position where the maximum displacement of the frame member, that is, the upper part of the first frame member 5 and the upper part of the second frame member 6 is connected by the vibration reducing members 22 and 23. Was found to be the best vibration countermeasure.
In the biaxial kneading extruder 1 of the present invention, the first frame member 5 and the second frame member 6 are connected by connecting the vibration reducing members 22 and 23 between the first frame member 5 and the second frame. It is integrated and the rigidity is increased, and the vibration of the kneading rotor 3 can be suppressed.

Next, the effect when the first drive end frame member and the second drive end frame member are connected by the vibration reducing members 22 and 23 will be described in more detail using some examples.
As described above, the kneader 1 used in the examples and the comparative examples includes the first frame member 5, the second frame member 6, the barrel 2 support member, and the third frame member 8, and kneads with these. This is a twin-screw kneading extruder 1 configured to support the load of the machine 1.
[Case 1]
As shown in FIG. 4, the vibration reducing members 22 and 23 are two long members, and are fastened so as to span the upper part of the first frame member 5 and the upper part of the second frame member 6. The two vibration reduction members 22 and 23 are fixed so as to intersect from the corner side of the upper surface of the first frame member 5 toward the corner side of the upper surface of the second frame member 6 that does not face each other. Thus, since the vibration reduction members 22 and 23 are connected so as to cross the upper part of the frame member, the shapes of the vibration reduction members 22 and 23 are different.

  First, of the two vibration reducing members 22 and 23, the vibration reducing member 22 disposed on the lower side is formed as a rectangular parallelepiped (cross-sectional shape: 70 mm × 100 mm), and cylindrical holes are formed at both ends. Are provided, and a fastener S such as a bolt can be passed therethrough. The vibration reducing member 22 disposed on the lower side illustrated in FIG. 4 is bridged from the upper right end of the first frame member 5 to the upper left end of the second frame member 6.

  Next, the vibration reduction member 23 disposed on the upper side is formed in a rectangular parallelepiped shape, similar to the vibration reduction member 22 disposed on the lower side, and a plurality of cylindrical holes are provided at both ends. Fasteners S such as bolts can be penetrated. Further, both end portions of the vibration reducing member 23 are formed with protruding portions for avoiding interference with the vibration reducing member disposed on the lower side. By forming the projecting portion downward, the vibration reducing member 23 arranged on the upper side passes through the upper part of the vibration reducing member 22 arranged on the lower side, and the vibration reducing members 22 and 23 are arranged. Interference between each other is avoided. The vibration reducing member 23 disposed on the upper side illustrated in FIG. 4 is bridged from the upper left end of the first frame member 5 to the upper right end of the second frame member 6.

These vibration reduction members 22 and 23 are connected to the upper surface of the first frame member 5 and the upper surface of the second frame member 6 by a fastener S that penetrates cylindrical holes at both ends.
[Case 2]
The vibration reduction member 24 shown in FIG. 5 is integrally formed so that the two vibration reduction members 22 (cross-sectional shape: 70 mm × 100 mm) as shown in FIG. 4 intersect in a cross shape. It is. That is, the vibration reducing member 24 is formed so that four beam portions protrude from the center of the vibration reducing member 24 in the horizontal direction with substantially the same length. By integrally forming the vibration reducing member 24 in a cross shape, the rigidity of the vibration reducing member 24 can be further increased, and the two vibration reducing members 24 do not interfere with each other.

As shown in FIG. 5, the vibration reducing member 24 formed in a cross shape is stretched from the upper right side of the first frame member 5 to the upper left side of the second frame member 6 and at the upper left side of the first frame member 5. To the right side of the upper surface of the second frame member 6. As in the case of the vibration reduction members 22 and 23 shown in FIG. 4, a plurality of cylindrical holes are provided at both ends of the vibration reduction member 24 shown in FIG. 5 so that a fastener S such as a bolt can be passed therethrough. Yes. The vibration reducing member 24 formed in a cross shape is fixed to the upper surface of the first frame member 5 and the upper surface of the second frame member 6 by a fastener S penetrating through a cylindrical hole.
[Case 3]
The vibration reduction member 25 shown in FIG. 6 is two long members, and is fastened so as to connect the side surface of the first frame member 5 and the side surface of the second frame member 6.

  For example, one vibration reducing member 25 is fastened so as to connect from the left side surface (front side of the paper surface) of the first frame member 5 toward the right side surface (back side of the paper surface) of the second frame member 6. The other vibration reducing member 25 is fastened so as to be connected from the right side surface (the back side of the paper surface) of the first frame member 5 toward the left side surface (the front side of the paper surface) of the second frame member 6. That is, the two vibration reduction members 25 of the case 3 are connected so as to intersect between the first frame member 5 and the second frame member 6. Thus, since the two vibration reduction members 25 are connected so as to intersect with the horizontal direction, the respective vibration reduction members 25 are arranged so as to be shifted in the vertical direction.

  The vibration reducing member 25 of the case 3 includes a beam portion 26 formed of a rectangular parallelepiped (cross-sectional shape: 70 mm × 100 mm), and a connecting portion 27 that connects the beam portion 26 and the side surface of the frame member. ing. The beam portions 26 are arranged so as to connect the corners of the frame members (DE1, DE2) 5, 6 on the diagonal lines. In other words, the beam portion 26 is arranged in a state of hooking the corners of the frame members (DE1, DE2) 5, 6. At both ends of the beam portion 26, a connecting portion 27 that connects the side surface of the frame member and the beam portion is formed so as to protrude.

  The connecting portion 27 extends along the side surfaces of the frame members (DE 1, DE 2) 5, 6 and is arranged so as to contact the side surfaces of the frame members (DE 1, DE 2) 5, 6. The connecting portion 27 is provided with a plurality of cylindrical holes through which fasteners S such as bolts can pass, and the frame members (DE 1, DE 2) 5, 6 are connected by the fasteners S that pass through the cylindrical holes. The vibration reducing member 25 is connected.

The widths and thicknesses of the vibration reducing members 22 to 25 in the above-described case 1 to case 3 can suppress the magnitude of vibration generated in the kneader 1 and the speed of vibration. Moreover, it is desirable that these vibration reducing members 22 to 25 are formed of a metal such as steel.
On the other hand, although not shown, as a method of suppressing vibration, the vibration reducing member 22 formed in a rectangular parallelepiped (cross-sectional shape: 70 mm × 100 mm) is connected to the second frame member from the corner of the upper surface of the first frame member 5. There is a method in which the upper surface of 6 is fixed so as to be crossed in a non-intersecting manner toward the facing corner side. In other words, the two vibration reduction members 22 are fixed while the two vibration reduction members 22 are arranged in parallel. This method is also one of the methods for suppressing vibration.

Hereinafter, an example of analysis simulation in which the vibration of the kneading rotor 3 is suppressed by using the vibration reducing members 22 and 23 described above will be described.
Through computer simulation, numerical analysis of the load applied to the DE-side bearing portion 21 when the kneading rotor 3 was vibrated was performed.
FIG. 7 summarizes the results of the horizontal vibration speed at the position of the bearing 21 on the DE side.

First, “no reinforcement” shown in FIG. 7 will be described.
“No reinforcement” means that the vibration reducing members 22 and 23 are not used between the first frame member 5 and the second frame member 6, that is, the first frame member 5 and the second frame member 6 Are independent states.
When the kneading rotor 3 rotates in such a state, the load applied to the bearing 21 on the DE side is the largest. As shown in FIG. 3, a reaction force generated when the biaxial kneading rotor 3 rotates is transmitted to the frame member via the bearing portion 21, and a load is applied to a specific position of the bearing. Therefore, the frame member (
DE1, DE2) 5, 6 are in a cantilever state, and the vibration displacement on the upper end side (upper part) of the frame members (DE1, DE2) 5,6 increases. The analysis result of “no reinforcement” is set to a vibration speed of 100%, and is used as a reference for comparison with the analysis result when using the vibration reduction members 22 and 23 described later.

Next, the “parallel beam” shown in FIG. 7 will be described.
“Parallel beam” means that a strip-shaped vibration reducing member 22 is placed on a straight line between the upper left (right) side of the first frame member 5 and the upper left (right) side of the second frame member 6. That is, that is, the state where the two vibration reduction members 22 spanned between the first frame member 5 and the second frame member 6 are along the axial direction.

  Compared to “no reinforcement”, the “parallel beam” includes the first frame member 5 and the second frame member 6 connected together, and is expected to have a reinforcing effect. However, in the “parallel beam”, although the vibration reducing member 22 is connected along the axial direction, the bending rigidity of the beam portion is insufficient, and therefore the first frame member 5 (DE1) and the second frame member 6 The function of suppressing the antiphase vibration that occurs with (DE2) is weak. As a result, there is almost no reinforcing effect on the frame member and it does not contribute to the suppression of vibration. As shown in FIG. 7, in the “parallel beam”, the vibration speed is reduced by only several percent with respect to “no reinforcement”, and the vibration suppressing effect on the frame member does not appear.

Here, the “cross beam” shown in FIG. 7 will be described. The “cross beam” in FIG. 7 refers to a case where the vibration reduction members 22 and 23 are fastened so as to span the upper portions of the first frame member 5 and the second frame member 6 (case 1). It is the vibration reduction members 22 and 23 concerning.
Unlike the “parallel beam”, the “cross beam” is spanned so that the vibration reduction members 22 and 23 connected between the first frame member 5 and the second frame member 6 intersect each other. The shearing force accompanying the phase excitation force can be received by the expansion / contraction rigidity of the vibration reducing member. Therefore, the two frame members (DE1, DE2) 5, 6 can be prevented from being deformed in the opposite directions in the horizontal direction.

By the way, when a numerical analysis is performed by computer simulation using the connection shape of the vibration reduction members 22 and 23 such as “cross beam” as a parameter, the thickness and width of the vibration reduction members 22 and 23 necessary to obtain a target vibration speed, etc. The shape of the member can be determined, and a more efficient vibration suppressing effect can be obtained with minimal reinforcement.
In this way, by connecting the upper portion of the first frame member 5 (DE1) and the upper portion of the second frame member 6 (DE2) so as to intersect with the vibration reducing members 22 and 23, the drive unit 4 side The vibration of the frame members (DE1, DE2) 5, 6 installed on the (DE side) and the kneading rotor 3 supported by the frame members (DE1, DE2) can be suppressed. The vibration reducing members 22 and 23 are made of a metal square such as steel, and the manufacturing cost can be reduced. Further, since the vibration reducing members 22 and 23 are fixed by a fastener S such as a bolt, the vibration reducing members 22 and 23 are easily attached and detached, and maintenance work such as exchanging bearings provided on the frame members 5 and 6 is also easily performed. be able to.

  Further, as a method of suppressing the vibration of the frame members 5 and 6, a vibration reducing member (Case 1) connected in a cross shape between the first frame member 5 and the second frame member 6 is installed, and then the above-mentioned. The “parallel beam” (case 2) may be provided. If it does in this way, between the 1st frame member 5 and the 2nd frame member 6 will be fixed with four vibration reduction members, the rotation deformation which arises in frame members 5 and 6 can be controlled, and it is biaxial. The effect of suppressing the vibration force acting on the kneading extruder 1 is enhanced.

  In the embodiment disclosed this time, matters not explicitly disclosed, for example, operating conditions and operating conditions, various parameters, dimensions, weights, volumes, etc. of components deviate from the areas normally practiced by those skilled in the art. However, matters that can be easily assumed by those skilled in the art are employed.

1 Biaxial continuous kneader (kneader)
2 Barrel 3 Kneading rotor 4 Drive unit 5 First frame member (DE1)
6 Second frame member (DE2)
7 Connecting member 8 Third frame member (WE3)
DESCRIPTION OF SYMBOLS 9 Cooling water supply part 10 1st screw chamber 11 Kneading chamber 12 2nd screw chamber 13 Hopper 14 1st screw blade part 15 2nd screw blade part 16 Barrel support member 17 Kneading degree adjustment part 18 Kneading blade part 19 Power transmission shaft 20 Coupling 21 Bearing 22 Vibration reducing member (lower side)
23 Vibration reduction member (upper side)
24 Vibration reduction member (cross shape)
25 Vibration reduction member (S-shape)
26 Beam part 27 Connection part M Foundation foundation S Fastener

Claims (3)

A frame member that includes a barrel having a hollow inside, a pair of left and right kneading rotors inserted into the barrel, and a drive unit that rotates the kneading rotor, and rotatably supports the kneading rotor. In the biaxial kneading extruder provided with at least three in the axial direction of
Of the at least three frame members, two frame members are arranged on the drive unit side, and the two frame members are vibrations that reduce vibrations caused by the excitation force generated by the rotation of the kneading rotor. A reduction member is provided,
The vibration reduction member is fastened so as to cross over the upper portions of the two frame members and to cross each other . 2. The twin-screw kneading extruder according to claim 1 , wherein the vibration reducing member is fastened at either an upper surface of the frame member or an upper portion of a side surface of the frame member. The biaxial kneading extruder according to claim 1 or 2 , wherein the vibration reducing member is integrally formed in a cross shape.