CN219946840U - Banbury mixer for producing thermoplastic elastomer - Google Patents

Abstract

The utility model relates to an internal mixer for producing thermoplastic elastomers; the device at least comprises a conveying device, a banburying chamber and an extruding device, wherein a conveying screw in the conveying device stretches into a chamber body of the banburying chamber, the conveying screw can be matched with the banburying screw in the banburying chamber to convey thermoplastic elastomer raw materials between the banburying chamber and the extruding device, plasticization and extrusion of the thermoplastic elastomer raw materials are achieved in one device, and the thermoplastic elastomer conveyed into the banburying chamber is in a molten state, so that the banburying time in the banburying chamber can be reduced, and the yellowing degradation problem of the thermoplastic elastomer is further improved. Not only improves the production yield of TPE particles, but also simplifies the production process and improves the production efficiency of the internal mixer.

Description

Banbury mixer for producing thermoplastic elastomer

Technical Field

The utility model relates to the technical field of plastic production equipment, in particular to an internal mixer for producing a thermoplastic elastomer.

Background

The thermoplastic elastomer is TPE (Thermoplastic rubber), which is a thermoplastic elastomer material, and the formula of the TPE material is changed in a great variety, so that the production process conforming to the formula is very important in production.

In the related art, when the ultra-low shear strength process is needed for producing some special TPEs, an internal mixer is often selected for melting, mixing and plasticizing, and then a single screw extruder is added for extrusion granulation, so that the production efficiency is low, the working procedure is complicated, and the problems of yellowing, degradation and the like of materials in the internal mixing chamber for a long time are solved due to the fact that the TPE formula is generally a loose mixture of powder and particles, and the yield of the produced TPE particles is reduced.

Disclosure of Invention

Based on this, it is necessary to provide an internal mixer for producing thermoplastic elastomers to improve the production efficiency, simplify the production process and increase the yield of TPE particles.

The aim of the utility model can be achieved by the following technical scheme:

an internal mixer for producing thermoplastic elastomers, comprising:

a conveyor comprising a housing and a conveyor screw disposed within the housing, the conveyor screw configured to be reciprocally rotatable about a first axis;

the banburying chamber comprises a chamber body and a banburying screw rod arranged in the chamber body; the conveyor screw having an entry section extending into the chamber body in the first direction, the banburying screw being configured to be rotatable about a second axis to fit the entry section of the conveyor screw; and

the extruding device is arranged at one end of the shell, which is far away from the banburying chamber, along the first direction;

wherein the internal mixer has a first conveying state and a second conveying state;

in the first conveying state, the conveying screw is used for conveying the molten thermoplastic elastomer in the shell along the first direction, and the extending section is matched with the banburying screw so as to convey the molten thermoplastic elastomer to the chamber body for mixing and plasticizing;

in the second conveying state, the conveying screw is used for conveying the mixed and plasticized thermoplastic elastomer to the extrusion device along the first direction, and the extrusion device is used for extruding the mixed and plasticized thermoplastic elastomer into a strip-shaped thermoplastic elastomer;

the first axis, the second axis and the first direction are mutually parallel.

In one embodiment, the conveying screw comprises two sub-screws capable of rotating in the same direction, and each sub-screw is provided with a conveying block.

In one embodiment, the banburying chamber further comprises a banburying heavy hammer arranged at one side of the banburying screw;

the banburying heavy hammer is used for mixing and plasticizing the molten thermoplastic elastomer conveyed by the conveying screw.

In one embodiment, the banburying heavy hammer can reciprocate along a second direction relative to the banburying screw, and the banburying heavy hammer, the banburying screw and the conveying screw are sequentially arranged at intervals along the second direction;

the second direction is perpendicular to the first direction.

In one embodiment, the diameter of the banburying screw is greater than the diameter of the conveying screw.

In one embodiment, the length of the conveyor screw entry section in the first direction is the same as the length of the banburying screw.

In one embodiment, the internal mixer further comprises a discharging device connected with the shell;

the blanking device is used for conveying thermoplastic elastomer raw materials into the shell.

In one embodiment, the blanking device comprises a blanking member and a blanking switch valve, wherein the blanking member is communicated with the shell and is used for conveying thermoplastic elastomer raw materials into the shell, and the blanking switch valve is arranged at the joint of the blanking member and the shell; and/or

Along the first direction, the blanking device is positioned between the extrusion device and the banburying chamber.

In one embodiment, the internal mixer further comprises a temperature control device;

the temperature control device is arranged on the shell and used for adjusting the temperature of the shell.

In one embodiment, the temperature control device comprises a plurality of heating rings and cooling pipes;

the heating ring is arranged on the outer wall of the shell so as to heat the shell, and the part of the cooling pipe is arranged inside the shell.

The utility model provides an internal mixer for producing thermoplastic elastomer, which at least comprises a conveying device, an internal mixing chamber and an extrusion device, wherein a conveying screw in the conveying device stretches into a chamber body of the internal mixing chamber, the conveying screw can be matched with the internal mixing screw in the internal mixing chamber to complete the conveying of thermoplastic elastomer raw materials between the internal mixing chamber and the extrusion device, the plasticization and extrusion of the thermoplastic elastomer raw materials are completed in one device, and the thermoplastic elastomer conveyed into the internal mixing chamber is in a molten state, so that the internal mixing time in the internal mixing chamber can be reduced, and the yellowing and degradation problem of the thermoplastic elastomer is further improved. Therefore, the internal mixer provided by the embodiment of the utility model has the advantages of simple structure, simplified production procedures, improved production efficiency of the internal mixer and improved production yield of TPE particles.

Drawings

Fig. 1 is a schematic view of an internal mixer according to an embodiment of the present utility model.

Fig. 2 is a schematic cross-sectional view of the internal mixing chamber shown in fig. 1.

Reference numerals illustrate:

101. a housing; 102. a conveying screw; 20. an extrusion device; 30. a banburying chamber; 301. a chamber body; 302. banburying heavy hammer; 303. banburying a screw; 401. a blanking member; 402. a blanking switch valve; 501. a heating ring; 502. a cooling tube; f1, a first direction; f2, the second direction.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

Referring to fig. 1, fig. 1 shows a schematic view of an internal mixer in an embodiment of the present utility model, which provides an internal mixer including a conveying device, an extrusion device 20, and a mixing chamber 30. The conveying device includes a housing 101 and a conveying screw 102 provided in the housing 101, the conveying screw 102 being configured to be reciprocally rotatable about a first axis. The mixing chamber 30 includes a chamber body 301 and a mixing screw 303 provided in the chamber body 301. The conveyor screw 102 has an entry section extending into the chamber body 301 in a first direction, and the banburying screw 303 is configured to be rotatable about a second axis so as to fit the entry section of the conveyor screw 102, and the extrusion device 20 is provided at an end of the housing 101 remote from the banburying chamber 30 in the first direction F1.

The internal mixer has a first conveying state and a second conveying state. In the first conveying state, the conveying screw 102 is used for conveying the molten thermoplastic elastomer located in the housing 101 in the first direction F1, and the extending section cooperates with the banburying screw 303 to convey the molten thermoplastic elastomer to the chamber body 301 for kneading and plasticizing. In the second conveying state, the conveying screw 102 is used for conveying the thermoplastic elastomer after kneading and plasticizing to the extrusion device 20 along the first direction F1, and the extrusion device 20 is used for extruding the thermoplastic elastomer after kneading and plasticizing into a strip-shaped thermoplastic elastomer, and the first axis, the second axis and the first direction F1 are parallel to each other.

Further, the internal mixer further comprises a blanking device connected with the shell 101. The blanking device comprises a blanking member 401 and a blanking switch valve 402, wherein the blanking member 401 is communicated with the shell 101 and is used for conveying thermoplastic elastomer raw materials into the shell 101, and the blanking switch valve 402 is arranged at the joint of the blanking member 401 and the shell 101.

The operation flow of the internal mixer is as follows: when an operator pours a certain amount of thermoplastic elastomer (hereinafter, abbreviated as TPE) raw material into the blanking member 401, the blanking member 401 delivers the TPE raw material into the housing 101 at a uniform speed, and the internal mixer is in a first delivery state, and the TPE raw material is delivered into the internal mixing chamber 30. The TPE raw materials enter the chamber body 301 of the internal mixing chamber 30 and gradually transfer from the conveying screw 102 to the internal mixing screw 303, and are melted, mixed and plasticized in the internal mixing chamber 30 to obtain the internal mixed TPE, at this time, the internal mixer is converted into a second conveying state (when the internal mixer is in the second conveying state, the rotation direction of the conveying screw 102 is opposite to that of the conveying screw 102 when the internal mixer is in the first conveying state, when the conveying screw 102 in the first conveying state rotates anticlockwise, the conveying screw 102 in the corresponding second conveying state rotates clockwise, and when the conveying screw 102 in the first conveying state rotates clockwise, the conveying screw 102 in the corresponding second conveying state rotates anticlockwise), so that the internal mixed TPE can be conveyed into the extrusion device 20 for extrusion.

The device links up extrusion device 20 and banburying chamber 30 together through conveying screw 102, and can accomplish the banburying and extrusion operation of TPE through conveying screw 102's two-way rotation, and the process is simple and easy, simple structure helps improving production efficiency.

Further, the operator pours the TPE raw material in a loose state into the blanking member 401, the blanking member 401 puts the TPE raw material into the housing 101 at a uniform speed, and the conveying screw 102 can convey the TPE in a molten state into the mixing chamber 30. The operation can reduce the banburying time of the TPE raw materials in the banburying chamber, reduce the yellowing degradation probability of the TPE particles of the finished product, and further improve the production yield of the TPE particles.

In some embodiments, referring still to FIG. 1, the internal mixer further includes a temperature control device. The temperature control device is mounted on the housing 101 for adjusting the temperature of the housing 101. The temperature control device comprises a plurality of heating rings 501 and cooling pipes 502, wherein the heating rings 501 are arranged on the outer wall of the shell 101 so as to heat the shell 101, and part of the cooling pipes 502 are arranged inside the shell 101. Because the formula of the TPE raw material is generally a mixture of loose powder and particles, the friction force of the material is small during banburying, and the temperature required for melting in the related art is basically derived from the heating wall contacting the banburying chamber 30, the heating speed is slow, and the problem of yellowing and degradation of the TPE raw material can be caused in the banburying chamber 30 for a long time. The device is provided with a temperature control system outside the shell 101, and can heat and cool the shell 101 to adjust the temperature inside the shell 101. When the TPE raw materials are conveyed to the internal mixing chamber 30, the temperature of the conveying screw 102 is increased along with the gradual increase of the temperature in the casing 101, and the conveying screw 102 can quickly melt the TPE raw materials in the process of conveying the TPE raw materials, so that the internal mixing time of the TPE raw materials in the internal mixing chamber 30 is reduced, the yellowing and degradation problems of the TPE raw materials are further reduced, and the production efficiency is improved. It can be appreciated that under the condition that the temperature control device is mounted on the housing, the TPE raw material can be changed into molten TPE in the process of conveying the TPE raw material by the conveyor screw 102, so that the time of banburying the TPE raw material in the banburying chamber is reduced, the probability of occurrence of the problem of yellowing degradation of the TPE is further reduced, the yield of TPE particles is improved, and the process is further simplified by melting the TPE raw material in the housing 101, so that the production efficiency is improved.

In this embodiment, the heating coil 501 may be electrically heated, and when the housing 101 needs to be heated, the heating coil 501 is energized to generate heat, and when the housing 101 is heated to a desired temperature, the power supply is turned off. When the temperature of the casing 101 needs to be reduced, cooling water is injected into the cooling pipe 502, and the cooling water flows into the cooling pipe 502 positioned in the casing 101 to absorb heat, so that the temperature in the casing 101 is reduced. The desired temperature of the housing 101 can be adjusted by heating the heat generating coil 501 and injecting cooling water.

The following description will proceed with reference to fig. 1, in which the temperature control device is mounted to the housing. It will be appreciated that in the case of delivering the molten TPE feedstock directly into the housing, reference may also be made to some embodiments described below, which will not be repeated here.

In some embodiments, with continued reference to fig. 1, the internal mixer further includes a blanking device coupled to the housing 101. The blanking device comprises a blanking member 401 and a blanking switch valve 402, wherein the blanking member 401 is communicated with the shell 101 and is used for conveying thermoplastic elastomer raw materials into the shell 101, and the blanking switch valve 402 is arranged at the joint of the blanking member 401 and the shell 101.

In this embodiment, the blanking member 401 is configured into a bucket shape with a wide upper portion and a narrow lower portion, and the opening diameter of the upper portion of the blanking member 401 is large, which is beneficial to injecting and mixing TPE raw materials, and the opening diameter of the lower portion of the blanking member 401 is small, which is more beneficial to injecting TPE raw materials into the housing 101.

The device can be produced in a discontinuous quantitative mode. When an operator pours a certain amount of TPE material into the housing 101, the blanking switch valve 402 is closed. The closing of the blanking switch valve 402 can prevent the conveying screw 102 from extruding the molten TPE from the joint between the blanking member 401 and the housing 101 (i.e. the blanking port of the housing 101) in the second conveying state (i.e. conveying the molten TPE to the extrusion device 20), which results in the blockage of the blanking port and the waste of resources.

Further, referring to fig. 1, in the first direction, the blanking device is located between the extrusion device 20 and the mixing chamber 30. This arrangement allows time for the TPE feedstock to melt within the housing 101 before entering the mill 30, helping to speed up the melting of the TPE feedstock and preventing the TPE from developing Huang Jiangjie in the mill 30 for a long period of time.

In some embodiments, referring to fig. 2, fig. 2 is a schematic cross-sectional structural view of the mixing chamber shown in fig. 1, the conveyor screw 102 comprising two sub-screws capable of co-rotating. Along with the heating of the shell 101, the temperature of the conveying screw 102 is gradually increased, and the contact area between the TPE raw material and the conveying screw 102 can be increased by the arrangement of the double screws, so that the melting speed of the TPE raw material is increased, the banburying time of the TPE raw material in the banburying chamber 30 is shortened, and the problems of yellowing, degradation and the like of the TPE can be improved, so that the production efficiency is improved.

The two corotating sub-screws are specifically configured to be meshed with a corotating double-screw extruder, and the corotating double-screw extruder has the advantages of high conveying efficiency, strong dispersion mixing capability, good self-cleaning performance, uniform residence time distribution of materials in the extruder, good adaptability and the like.

First, intermeshing counter-rotating twin screw extruders facilitate homogenization and mixing of TPE feedstock. The meshing directional rotating double-screw extruder has small gap at the meshing position, the speed directions of the screw edges and the screw grooves are opposite, and the relative speed is high, so that the meshing area has high shearing speed, the shearing force is high, and the mixing effect is far better than that of a single-screw extruder and a different-direction rotating double-screw extruder.

Secondly, the intermeshing counter-rotating double screw extruder is beneficial to plasticizing the TPE raw material. The size of the screw clearance has a great influence on the plasticizing quality of the materials. The smaller the gap, the greater the shear force, but the smaller the amount of material passing through, the greater the gap, the greater the amount of material passing through, but the smaller the shear force.

Finally, the intermeshing counter-rotating twin screw extruder facilitates compression of the TPE feedstock. The method for compressing the materials by the co-rotating double screw extruder is more, and the comprehensive effect is good.

Further, the equidirectional twin screws are configured such that only a conveying block is provided on each sub-screw. The arrangement of the conveying screw 102 with only conveying blocks can enable the TPE raw materials to be heated and melted rapidly under the condition of ultra-low shear strength, so that the melting time of the TPE in the banburying chamber 30 is shortened, and the production quality of the TPE is improved.

In some embodiments, with continued reference to fig. 2, the mixing chamber 30 further includes a mixing weight 302 disposed on one side of the mixing screw 303, where the mixing weight 302 is configured to better match the mixing screw 303 to mix and plasticize the melted thermoplastic elastomer, the mixing weight 302 is capable of reciprocating relative to the mixing screw 303 along a second direction F2, and the mixing weight 302, the mixing screw 303, and the conveyor screw 102 are sequentially spaced apart along the second direction F2, where the second direction F2 is perpendicular to the first direction F1.

Specifically, because this device can adopt intermittent quantitative production, then quantitative molten TPE can all be conveyed to banburying chamber 30 in the casing 101 at a certain moment, after conveying screw 102 stretches into the section in banburying chamber 30 and shifts molten TPE to banburying screw 303, banburying weight 302 extrudes repeatedly to the molten TPE of whole quantity, until extrude the air in the molten TPE, avoid the TPE granule after extruding to exist the bubble, guarantee the production quality of TPE granule, and can make molten TPE accomplish mixing and plasticization in the short time, improve production efficiency.

In some embodiments, with continued reference to fig. 2, the diameter of the banburying screw 303 is greater than the diameter of the conveying screw 102. The larger the diameter of the banburying screw 303 is, the larger the extrusion area of the banburying heavy hammer 302 to the molten TPE is, so that the mixing and plasticizing efficiency can be better improved, the production efficiency of the TPE is further improved, the time of the TPE in the banburying chamber 30 can be reduced, and the production quality of the TPE is ensured.

Further, the length of the extension of the conveyor screw 102 in the first direction F1 is the same as the length of the banburying screw 303. The conveyor screw 102 extends into the same length as the banburying screw 303, which facilitates the transfer of the molten TPE, and the banburying screw 303 is better used for mixing and plasticizing the molten TPE.

In some embodiments, with continued reference to fig. 1, the internal mixer further includes a machine, and the conveying device, the internal mixing chamber 30, the extrusion device 20, the blanking device, and the temperature control system are disposed on the machine and electrically connected to the machine. The machine is started, the conveying device, the banburying chamber 30, the extruding device 20, the blanking device and the temperature control system are all started to operate, and the machine is closed, and the conveying device, the banburying chamber 30, the extruding device 20, the blanking device and the temperature control system are stopped to operate.

Further, the internal mixer further comprises a control panel, and the control panel is electrically connected with the machine table, the output device and the temperature control system. An operator can control the switch of the machine table on the control panel so as to conveniently control the operation and stop of the internal mixer. The operator can also set the rotational speed of the conveyor screw 102 on the control panel to accommodate the production needs of different TPEs. The operator can set the temperature of the casing 101 on the control panel, and adjust the temperature in the casing 101.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

In the description of the present utility model, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Claims (10)

1. An internal mixer for producing thermoplastic elastomers, characterized in that it comprises:

a conveyor comprising a housing and a conveyor screw disposed within the housing, the conveyor screw configured to be reciprocally rotatable about a first axis;

the banburying chamber comprises a chamber body and a banburying screw rod arranged in the chamber body; the conveyor screw having an entry section extending into the chamber body in the first direction, the banburying screw being configured to be rotatable about a second axis to fit the entry section of the conveyor screw; and

the extruding device is arranged at one end of the shell, which is far away from the banburying chamber, along the first direction;

wherein the internal mixer has a first conveying state and a second conveying state;

in the first conveying state, the conveying screw is used for conveying the molten thermoplastic elastomer in the shell along the first direction, and the extending section is matched with the banburying screw so as to convey the molten thermoplastic elastomer to the chamber body for mixing and plasticizing;

in the second conveying state, the conveying screw is used for conveying the mixed and plasticized thermoplastic elastomer to the extrusion device along the first direction, and the extrusion device is used for extruding the mixed and plasticized thermoplastic elastomer into a strip-shaped thermoplastic elastomer;

the first axis, the second axis and the first direction are mutually parallel.

2. An internal mixer for producing thermoplastic elastomers according to claim 1, characterised in that said conveying screw comprises two sub-screws capable of co-rotating and each provided with a conveying block.

3. The internal mixer for producing a thermoplastic elastomer according to claim 1, wherein the internal mixing chamber further comprises a mixing weight provided at one side of the mixing screw;

the banburying heavy hammer is used for mixing and plasticizing the molten thermoplastic elastomer conveyed by the conveying screw.

4. An internal mixer for producing a thermoplastic elastomer according to claim 3, wherein the internal mixer weight is reciprocally movable in a second direction with respect to the internal mixer screw, and the internal mixer weight, the internal mixer screw, and the conveying screw are sequentially arranged at intervals in the second direction;

the second direction is perpendicular to the first direction.

5. An internal mixer for producing thermoplastic elastomers according to claim 1, characterised in that the diameter of said internal mixer screw is larger than the diameter of said conveyor screw.

6. An internal mixer for producing thermoplastic elastomers according to claim 3 characterised in that the length of said conveyor screw run-in section in said first direction is the same as the length of said internal mixer screw.

7. An internal mixer for producing thermoplastic elastomers according to any of claims 1-6, characterised in that said internal mixer further comprises a blanking device connected to said housing;

the blanking device is used for conveying thermoplastic elastomer raw materials into the shell.

8. The internal mixer for producing thermoplastic elastomer according to claim 7, wherein the blanking device comprises a blanking member and a blanking switch valve, the blanking member is communicated with the shell and is used for conveying thermoplastic elastomer raw materials into the shell, and the blanking switch valve is arranged at the joint of the blanking member and the shell; and/or

Along the first direction, the blanking device is positioned between the extrusion device and the banburying chamber.

9. An internal mixer for producing thermoplastic elastomers according to any of claims 1-6 characterized in that said internal mixer further comprises a temperature control device;

the temperature control device is arranged on the shell and used for adjusting the temperature of the shell.

10. The internal mixer for producing thermoplastic elastomers according to claim 9, characterized in that the temperature control device comprises several heating rings and cooling pipes;

the heating ring is arranged on the outer wall of the shell so as to heat the shell, and the part of the cooling pipe is arranged inside the shell.