A composite mixing system

Abstract

The present invention discloses a composite mixing system. The present invention performs pre-plasticization through a single screw feeding structure. When the material enters the single screw feeding structure, the feeding section feeds forward, the forward spiral section produces a forward pumping effect, and the reverse spiral section produces a pumping effect opposite to the forward spiral section. The forward and reverse thrusts formed by the forward spiral section and the reverse spiral section can shear, tear, knead, and extrude the material, thereby achieving dispersion, mixing, and plasticization of the material. When the single screw feeding structure is connected to the feeding structure or the planetary structure, the pre-plasticization of the material can be achieved. After the pre-plasticized material enters the planetary extruder, the wear of the material on the feeding structure or the planetary structure of the planetary extruder can be greatly reduced. The exhaust mechanism is connected to the planetary structure to discharge the gas of the material in the planetary structure.

Description

Technical Field

[0001] The invention relates to the technical field of plastic extrusion equipment, in particular to a composite mixing system. Background Art

[0002] Planetary extruder is a multi-screw extruder, which has the advantages of good mixing effect, uniform plasticization, good dispersion effect of added additives, high production capacity, energy saving, etc. Therefore, it is widely used in the extrusion and mixing of various plastics.

[0003] The existing planetary extruder directly uses the feeding section to feed the material into the planetary mixing section. The feeding section only has the function of feeding. The material starts to plasticize after entering the planetary mixing section, which will inevitably cause dry friction. When these plastics are not heated enough and melt unevenly, it is easy to cause increased wear on the inner wall of the barrel and the surface of the screw. Therefore, when using the existing planetary extruder to produce high-calcium fillers and rubber, the material wears the planetary screw teeth very much. In addition, the planetary extruder in the prior art has no exhaust function and cannot exhaust excess gas. Summary of the invention

[0004] The purpose of the present invention is to provide a composite mixing system to solve the problems existing in the above-mentioned prior art. Through the single-screw feeding structure, the material is pre-plasticized before entering the mixing section of the planetary extruder, thereby avoiding dry friction and reducing the wear of the inner wall of the barrel and the screw surface. The exhaust mechanism can discharge the gas in the material.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a composite mixing system, comprising a planetary extruder, a single-screw feeding structure and an exhaust mechanism, wherein the single-screw feeding structure comprises a feeding screw, and the feeding screw is provided with a feeding section, a forward spiral section and a reverse spiral section in sequence from back to front, the planetary extruder comprises a second power mechanism, a feeding structure and a plurality of planetary structures connected in sequence, the single-screw feeding structure is connected to a first feeding port on the feeding structure or any of the planetary structures, and the exhaust mechanism is connected to the first feeding port on any of the remaining planetary structures.

[0007] Preferably, the single-screw feeding structure also includes a screw sleeve arranged on the outside of the feeding screw, the rear end of the feeding screw is connected to the first power mechanism, the thread rotation direction of the feeding section and the forward screw corrugation section is the same, the thread rotation direction of the forward screw corrugation section and the reverse screw corrugation section is opposite, the forward screw corrugation section and the reverse screw corrugation section are mixing sections, and a feed port is opened at a position on the screw sleeve corresponding to the feeding section.

[0008] Preferably, a spiral oil groove is arranged in the screw sleeve around the axial direction of the screw sleeve, and an oil inlet hole and an oil outlet hole are arranged on the screw sleeve. The oil inlet hole and the oil outlet hole are both connected to the oil groove, and high-temperature oil is introduced into the oil groove through the oil inlet hole.

[0009] Preferably, a spiral heating wire is wound in the screw sleeve around the axial direction of the screw sleeve, and the heating wire is electrically connected to an external power supply.

[0010] Preferably, a hot oil channel is arranged in the feeding screw along the axial direction of the feeding screw, and the hot oil channel includes an oil inlet channel and an oil return channel arranged in parallel, and the oil inlet channel and the oil return channel are connected at the front end of the feeding screw.

[0011] Preferably, an outlet flange is provided at the front end of the screw sleeve, and the outlet flange is used to be connected to the first feeding port of the feeding structure or any of the planetary structures.

[0012] Preferably, the exhaust mechanism includes a twin-screw structure consisting of two screws arranged in parallel and a screw barrel sleeved on the outside of the twin-screw structure, the rear end of the twin-screw structure is connected to the exhaust power mechanism, the screw barrel is provided with an exhaust hole, a needle valve is provided in the exhaust hole, and the front end of the screw barrel is provided with an exhaust flange, and the exhaust flange is used to connect with the first feeding port of the planetary structure.

[0013] Preferably, the feeding structure includes a feeding screw and a feeding barrel sleeved on the outside of the feeding screw, the planetary structure includes a main screw, a plurality of planetary screws meshing with the main screw, and a planetary barrel sleeved on the outside of the main screw and the planetary screws, the first feeding port is arranged on the feeding barrel or the planetary barrel, the main screw is transmission connected to the feeding screw, the main screws of the adjacent planetary structures are transmission connected, and one end of the planetary barrel of the outermost planetary structure is a discharge port.

[0014] Preferably, the feed barrel and the planetary barrel as well as the planetary barrels are connected via flanges, and a spacer ring is provided on the inner side of the connection between two adjacent flanges, and a liquid injection port is provided on the spacer ring; the feed barrel is also provided with a second feeding port.

[0015] Preferably, the cross-sections of the forward spiral corrugated segment and the reverse spiral corrugated segment are both formed by sequentially connecting a first straight line segment, a first curved line segment, a second straight line segment, and a second curved line segment, wherein the first straight line segment is opposite to the second straight line segment, and the first curved line segment is opposite to the second curved line segment.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The present invention performs pre-plasticization through a single screw feeding structure. When the material enters the single screw feeding structure, the feeding section feeds forward, the forward spiral section produces a forward pumping effect, and the reverse spiral section produces a pumping effect opposite to the forward spiral section. The forward and reverse thrusts formed by the forward spiral section and the reverse spiral section can shear, tear, knead, and extrude the material, thereby achieving dispersion, mixing, and plasticization of the material. When the single screw feeding structure is connected to the feeding structure or the planetary structure, the pre-plasticization of the material can be achieved. After the pre-plasticized material enters the planetary extruder, the wear of the material on the feeding structure or the planetary structure of the planetary extruder can be greatly reduced. The exhaust mechanism is connected to the planetary structure to discharge the gas of the material in the planetary structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A top view of the composite mixing system of the present invention;

[0020] Figure 2 for Figure 1 A partial enlarged view of

[0021] Figure 3 It is a front view of the single screw feeding structure of the present invention;

[0022] Figure 4 A top view of the single screw feeding structure of the present invention;

[0023] Figure 5 It is a schematic diagram of the feeding screw of the present invention;

[0024] Figure 6 It is a cross-sectional schematic diagram of a forward spiral corrugation section and a reverse spiral corrugation section of the present invention;

[0025] Figure 7 It is a schematic diagram of the exhaust mechanism of the present invention;

[0026] Among them: 1-feeding screw, 2-screw sleeve, 3-feeding section, 4-forward screw corrugated section, 5-reverse screw corrugated section, 6-feeding port, 7-oil groove, 8-oil inlet, 9-motor, 10-reducer, 11-outlet flange, 12-feeding structure, 13-planetary structure, 14-first feeding port, 15-discharging port, 16-spacer ring, 17-oil outlet hole, 18-single screw feeding structure, 19-liquid injection port, 20-second feeding port, 21-exhaust mechanism, 22-screw, 23-needle valve, 24-exhaust flange, 25-reduction motor. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide a composite mixing system to solve the problems existing in the above-mentioned prior art. Through the single-screw feeding structure, the material is pre-plasticized before entering the mixing section of the planetary extruder, thereby avoiding dry friction and reducing the wear of the inner wall of the barrel and the screw surface. The exhaust mechanism can discharge the gas in the material.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1-Figure 7 As shown: This embodiment provides a composite mixing system, including a planetary extruder, a single-screw feeding structure 18 and an exhaust mechanism 21, the single-screw feeding structure 18 includes a feeding screw 1, and the feeding screw 1 is provided with a feeding section 3, a forward spiral section 4, a reverse spiral section 5 and a sealing thread section from back to front, the planetary extruder includes a second power mechanism, a feeding structure 12 and a plurality of planetary structures 13 connected in sequence, the single-screw feeding structure 18 is connected to the first feeding port 14 on the feeding structure 12 or any planetary structure 13, and the exhaust mechanism is connected to the first feeding port 14 on any other planetary structure 13.

[0031] In this embodiment, the front end refers to the feeding end, and the rear end is opposite to the front end.

[0032] Specifically, the single-screw feeding structure in this embodiment also includes a screw sleeve 2 which is sleeved on the outside of the feeding screw 1. The rear end of the feeding screw 1 is connected to the first power mechanism. The thread rotation directions of the feeding section 3, the forward screw corrugation section 4 and the sealing thread section are the same. The thread rotation directions of the forward screw corrugation section 4 and the reverse screw corrugation section 5 are opposite. The sealing thread section plays a sealing role. The forward screw corrugation section 4 and the reverse screw corrugation section 5 are mixing sections. An inlet 6 is provided at a position on the screw sleeve 2 corresponding to the feeding section 3.

[0033] In this embodiment, the cross-sections of the forward spiral corrugation segment 4 and the reverse spiral corrugation segment 5 are both formed by sequentially connecting a first straight line segment, a first curved line segment, a second straight line segment, and a second curved line segment, wherein the first straight line segment is opposite to the second straight line segment, and the first curved line segment is opposite to the second curved line segment. In this embodiment, the cross-sections of the forward spiral corrugation segment 4 and the reverse spiral corrugation segment 5 refer to the cross-sections perpendicular to the axial direction of the feeding screw 1.

[0034] In this embodiment, a heating structure is provided in the screw sleeve 2, a spiral oil groove 7 is provided in the screw sleeve 2 around the axial direction of the screw sleeve 2, an oil inlet hole 8 and an oil outlet hole 17 are provided on the screw sleeve 2, the oil inlet hole 8 and the oil outlet hole 17 are both communicated with the oil groove 7, and high-temperature oil is introduced into the oil groove 7 through the oil inlet hole 8. The heating structure in the screw sleeve 2 can also be a spiral heating wire wound around the axial direction of the screw sleeve 2, and the heating wire is electrically connected to an external power supply. The screw sleeve 2 can be heated by passing high-temperature oil or a heating wire of a heating spiral.

[0035] In this embodiment, a heating structure is provided in the feeding screw 1, and a hot oil channel is provided in the feeding screw 1 along the axial direction of the feeding screw 1. The hot oil channel includes an oil inlet flow channel and an oil return flow channel arranged in parallel, and the oil inlet flow channel and the oil return flow channel are connected at the front end of the feeding screw 1. High-temperature oil enters the feeding screw 1 through the oil inlet flow channel, and flows out of the feeding screw 1 through the oil return flow channel, thereby heating the feeding screw 1.

[0036] In this embodiment, heating structures are provided in the screw sleeve 2 and the feeding screw 1 to achieve heating of the material in the single screw feeding structure 18 .

[0037] In this embodiment, the first power mechanism and the second power mechanism have the same structure, both including a motor 9 and a reducer 10, the output end of the motor 9 is transmission-connected to the input end of the reducer 10, and the output end of the reducer 10 of the first power mechanism is fixedly connected to the rear end of the feeding screw 1 through a key. The first power mechanism realizes the power input to the feeding screw 1, and the rotation speed of the feeding screw 1 is 60-1000 rpm.

[0038] In this embodiment, an outlet flange 11 is provided at the front end of the screw sleeve 2 , and the outlet flange 11 is used to be connected to the first feeding port 14 of the feeding structure 12 or any planetary structure 13 .

[0039] The exhaust mechanism in this embodiment includes a twin-screw structure composed of two screws 22 arranged in parallel and a screw barrel sleeved on the outer side of the twin-screw structure. The rear end of the twin-screw structure is connected to the exhaust power mechanism, which is a reduction motor 25. The screw barrel is provided with an exhaust hole, and a needle valve 23 is provided in the exhaust hole. The front end of the screw barrel is provided with an exhaust flange 24, and the exhaust flange 24 is used to connect with the first feeding port 14 of the planetary structure 13. When the exhaust mechanism is connected to the planetary structure 13, the material enters the exhaust mechanism, and a vacuum pump can be connected to the needle valve 23 to discharge the gas through the action of the vacuum pump, or the vacuum pump can be not provided to discharge the gas automatically. The gas in the material or the gas generated by the plasticization of the material is discharged through the needle valve 23, which can reduce the decomposition of the material. The twin-screw structure of the exhaust mechanism pushes the material back into the planetary structure 13. The exhaust mechanism is connected to the planetary structure 13 adjacent to the feeding structure 12 to discharge the gas brought by the material and the gas generated by the decomposition of part of the material. When the exhaust mechanism is connected to the remaining planetary structures 13, the gas generated by the decomposition of the material can be discharged.

[0040] In this embodiment, the two screw rods 22 may be meshed, semi-meshed, or non-meshed, and the two screw rods 22 may rotate in the same direction or in opposite directions.

[0041] Specifically, the feeding structure 12 in this embodiment includes a feeding screw and a feeding barrel sleeved on the outside of the feeding screw. The output end of the reducer 10 of the second power mechanism is fixedly connected to the rear end of the feeding screw through a key. The planetary structure 13 includes a main screw, a plurality of planetary screws meshing with the main screw, and a planetary barrel sleeved on the outside of the main screw and the planetary screw. The first feeding port 14 is arranged on the feeding barrel or the planetary barrel, and each first feeding port 14 is provided with an inlet flange. The main screw is connected to the feeding screw by transmission, and the main screws of adjacent planetary structures 13 are connected by transmission. One end of the planetary barrel of the outermost planetary structure 13 is a discharge port 15.

[0042] In this embodiment, the same heating structure as that in the screw sleeve 2 is provided in the feed barrel and each planet barrel. The heating structure can be a spiral oil groove 7 arranged around the axial direction of the feed barrel and each planet barrel. The feed barrel and each planet barrel are provided with an oil inlet hole 8 and an oil outlet hole 17. The oil inlet hole 8 and the oil outlet hole 17 are both connected to the oil groove 7, and high-temperature oil is introduced into the oil groove 7 through the oil inlet hole 8. The heating structure in the feed barrel and each planet barrel can also be a spiral heating wire wound around the axial direction of the feed barrel and each planet barrel, and the heating wire is electrically connected to an external power supply. The feed barrel and each planet barrel can be heated by passing high-temperature oil or a heating wire of a heating spiral.

[0043] In this embodiment, the feeding screw and each main screw are provided with the same heating structure as that in the feeding screw 1. The feeding screw and each main screw are provided with a hot oil channel along their axial direction. The hot oil channel includes an oil inlet channel and an oil return channel arranged in parallel. The oil inlet channel and the oil return channel are connected at the front end of the feeding screw and each main screw. The high-temperature oil enters the feeding screw and each main screw through the oil inlet channel, and flows out of the feeding screw and each main screw through the oil return channel, thereby heating the feeding screw and each main screw.

[0044] In this embodiment, the feed cylinder and the planetary cylinder and the planetary cylinders are connected by flanges, and the inner sides of the connection between two adjacent flanges are provided with spacer rings 16, and the spacer rings 16 are provided with injection ports 19. Plasticizers or other plastic additives can be injected through the injection ports 19 according to the process requirements of the materials.

[0045] In this embodiment, a second feeding port 20 is further provided on the feeding barrel, and the second feeding port 20 is provided with an inlet flange.

[0046] When the composite mixing system of this embodiment is used, it can have the following working modes: 1. The single screw feeding structure 18 can be connected to the first feeding port 14 on the feeding barrel through the outlet flange 11 and the inlet flange, and the material one can be pre-plasticized through the single screw feeding structure 18, and then enter the feeding structure 12 and each planetary structure 13; 2. While the material one is pre-plasticized through the single screw feeding structure 18, the material two can be added through the second feeding port 20, so that the material two is mixed with the material one, and then passes through each planetary structure 13; 3. The single screw feeding structure 18 can be connected to the first feeding port 14 on any planetary barrel. At this time, no material can be added to the feeding structure 12, so that the single screw feeding structure 18 replaces the feeding structure 12, or material can be added to the feeding structure 12 to achieve mixing with the material in the single screw feeding structure 18. The composite mixing system of this embodiment can connect the single screw feeding structure 18 to different positions to achieve different functions.

[0047] In the above working mode, the exhaust mechanism of this embodiment can be connected to the first feed port 14 of any one or more planetary structures 13 .

[0048] When the single screw feeding structure 18 of this embodiment is working, the material enters the feeding section 3 through the feed port 6, and the feeding section 3 feeds forward. After entering the mixing section, the forward spiral section 4 produces a forward pumping effect, and the reverse spiral section 5 produces a pumping effect opposite to the forward spiral section 4. The forward and reverse thrusts formed by the forward spiral section 4 and the reverse spiral section 5 can shear, tear, knead, and squeeze the material, thereby achieving the dispersion, mixing, and plasticization of the material. When the single screw feeding structure 18 is connected to the planetary extruder, the pre-plasticization of the material can be achieved. After the pre-plasticized material enters the planetary extruder, the wear of the material on the planetary extruder feeding structure 12 or the planetary structure 13 can be greatly reduced. The exhaust mechanism can discharge the gas in the material or the gas generated by the plasticization of the material through the needle valve 23, which can reduce the decomposition of the material.

[0049] In this embodiment, a single screw feeding structure 18 is added to the feeding section of the planetary extruder, which can realize the pre-plasticization and mixing of the material. The single screw feeding structure 18 is used to feed the planetary extruder. After the material enters the mixing section, it is already in a semi-plasticized and mixed state, so the wear of the material on the planetary screw teeth can be greatly reduced, and the life of the planetary extruder can be increased. The exhaust mechanism can be connected to the planetary structure 13 at the feed end, can be connected to the planetary structure 13 at the discharge end, or can be set at both the discharge end and the feed end. The mixing section (planetary structure 13) with an exhaust function can effectively discharge the gas carried by the material and the gas generated during the plasticization of the material, thereby reducing the decomposition of the material.

[0050] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A composite mixing system, characterized in that: It comprises a planetary extruder, a single screw feeding structure and an exhaust mechanism, wherein the single screw feeding structure comprises a feeding screw, and the feeding screw is provided with a feeding section, a forward spiral section and a reverse spiral section from back to front in sequence, the planetary extruder comprises a second power mechanism, a feeding structure and a plurality of planetary structures connected in sequence, the single screw feeding structure is connected to the first feeding port on the feeding structure or any of the planetary structures, and the exhaust mechanism is connected to the first feeding port on any of the remaining planetary structures; The cross-sections of the forward spiral corrugation segment and the reverse spiral corrugation segment are both formed by sequentially connecting a first straight line segment, a first curved line segment, a second straight line segment, and a second curved line segment, wherein the first straight line segment is opposite to the second straight line segment, and the first curved line segment is opposite to the second curved line segment; The feeding structure includes a feeding screw and a feeding barrel sleeved on the outside of the feeding screw, and the planetary structures include a main screw, a plurality of planetary screws meshing with the main screw, and a planetary barrel sleeved on the outside of the main screw and the planetary screws. The first feeding port is arranged on the feeding barrel or the planetary barrel, the main screw is transmission-connected to the feeding screw, the main screws of the adjacent planetary structures are transmission-connected, and one end of the planetary barrel of the outermost planetary structure is a discharge port.

2. The composite mixing system according to claim 1, characterized in that: The single-screw feeding structure also includes a screw sleeve sleeved on the outside of the feeding screw, the rear end of the feeding screw is connected to the first power mechanism, the feeding section and the forward screw corrugated section have the same thread rotation direction, the forward screw corrugated section and the reverse screw corrugated section have opposite thread rotation directions, the forward screw corrugated section and the reverse screw corrugated section are mixing sections, and a feed port is opened at a position on the screw sleeve corresponding to the feeding section.

3. The composite mixing system according to claim 2, characterized in that: A spiral oil groove is arranged in the screw sleeve around the axial direction of the screw sleeve, and an oil inlet hole and an oil outlet hole are arranged on the screw sleeve. The oil inlet hole and the oil outlet hole are both connected to the oil groove, and high-temperature oil is introduced into the oil groove through the oil inlet hole.

4. The composite mixing system according to claim 2, characterized in that: A spiral heating wire is wound in the screw sleeve and around the axial direction of the screw sleeve, and the heating wire is electrically connected to an external power supply.

5. The composite mixing system according to claim 2, characterized in that: A hot oil channel is arranged in the feeding screw along the axial direction of the feeding screw, and the hot oil channel includes an oil inlet channel and an oil return channel arranged in parallel, and the oil inlet channel and the oil return channel are connected at the front end of the feeding screw.

6. The composite mixing system according to claim 2, characterized in that: An outlet flange is disposed at the front end of the screw sleeve, and the outlet flange is used to be connected to the first feeding port of the feeding structure or any of the planetary structures.

7. The composite mixing system according to claim 1, characterized in that: The exhaust mechanism includes a twin-screw structure composed of two screws arranged in parallel and a screw barrel sleeved on the outside of the twin-screw structure. The rear end of the twin-screw structure is connected to the exhaust power mechanism. An exhaust hole is provided on the screw barrel, and a needle valve is provided in the exhaust hole. An exhaust flange is provided at the front end of the screw barrel, and the exhaust flange is used to connect with the first feeding port of the planetary structure.

8. The composite mixing system according to claim 1, characterized in that: The feed cylinder and the planetary cylinder are connected with each other through flanges, and the inner sides of the connection points of two adjacent flanges are provided with spacer rings, and the spacer rings are provided with liquid injection ports; the feed cylinder is also provided with a second feeding port.

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