CN217257503U - Rubber mixing production line of multi-station series internal mixer - Google Patents
Rubber mixing production line of multi-station series internal mixer Download PDFInfo
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- CN217257503U CN217257503U CN202220835720.XU CN202220835720U CN217257503U CN 217257503 U CN217257503 U CN 217257503U CN 202220835720 U CN202220835720 U CN 202220835720U CN 217257503 U CN217257503 U CN 217257503U
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Abstract
The utility model relates to a multistation series connection banbury mixer smelts gluey production line belongs to tire production facility field. The lower station of the upper internal mixer is provided with N lower internal mixers connected in parallel, N is an integer larger than or equal to 2, the next station of the N lower internal mixers connected in parallel is provided with an extruder, the next station of the extruder is provided with a film cooling and rubber receiving device, the upper internal mixer discharges the first rubber material after mixing to the first lower internal mixer of the lower station for complementary mixing, the upper internal mixer continuously finishes mixing of the second rubber material and then discharges to the second lower internal mixer of the lower station for complementary mixing, the upper internal mixer continuously finishes mixing of the Nth rubber material and then discharges to the Nth lower internal mixer of the lower station for complementary mixing, the mixing period of the lower internal mixer is less than N times of the mixing period of the upper internal mixer, the upper internal mixer does not need to wait for continuous mixing of the (N + 1) th rubber material and then discharges to the first lower internal mixer of the lower station for complementary mixing, the N lower internal mixers connected in parallel produce rubber materials and are sequentially conveyed to the extruder through a conveying belt, and then are cooled and received by the film for standby after the film.
Description
Technical Field
The utility model belongs to tire production facility field says in detail a multistation series connection banbury mixer smelts gluey production line.
Background
As is well known, a traditional series internal mixer comprises an upper station and a lower station, wherein the upper station is a complete internal mixer, when the internal mixer works, a rotor of the upper internal mixer keeps high rotation speed, an upper ram is subjected to lifting and pressing for 3-5 steps under certain pressure, raw rubber, carbon black, a compounding agent and other raw materials are quickly mixed to a certain degree, rubber is discharged at the set temperature of a sizing material and is directly discharged to the internal mixer of the lower station without a cooling process, the lower station is an internal mixer with the upper ram removed, a complementary mixing effect can be achieved on the upper vehicle, mixing uniformity and mixing degree are improved, and the lower internal mixer with a set variable-rotation-speed constant-temperature mixing process can provide a reaction site for each component in the sizing material. In efficiency, the mixing cycle time of the upper internal mixer and the mixing cycle time of the lower internal mixer are matched, so that the production efficiency can be exerted to the maximum, namely the mixing cycle time of the lower internal mixer is slightly less than that of the upper internal mixer. In energy consumption, the sizing materials produced by upper banburying are directly discharged to a lower-station banbury mixer without a cooling process, so that the problem that the sizing materials need to be repeatedly heated and cooled to cause energy loss when a single banbury mixer is used for multi-stage production is avoided.
In practice, in many enterprises, conventional internal mixers in series are used mainly in two directions.
The rubber is used as a master batch internal mixer in multi-section mixing of the traditional method, 1-4 sections of master batches are produced according to the mixing degree required by the formula of the rubber material, and then the master batches are supplied to a final rubber internal mixer to be added with a final mixing ingredient to produce final rubber.
And the other is used as a rubber mixing internal mixer in one-step mixing, and 4-7 open mills capable of automatically mixing rubber and automatically weighing and adding a final mixing ingredient are matched with the lower auxiliary machine, so that the production from raw materials to the final mixed rubber is completed at one step.
However, the traditional series internal mixer structure causes the following disadvantages in practical application:
as a master batch internal mixer in the traditional method multi-section mixing, in order to maximize the production efficiency of the traditional series internal mixer, a constant temperature mixing process is not generally arranged on an upper internal mixer, so the period of master batch mixing of the upper internal mixer is about 250s generally, the mixing period time of a lower internal mixer cannot exceed the mixing period time of the upper internal mixer for 250s, otherwise, the upper internal mixer delays to discharge rubber and reduces the production efficiency, the supplementing and mixing time of the lower internal mixer of 250s in the actual production process cannot be fully exerted, the supplementing and mixing effects of the lower internal mixer cannot be further improved, the plasticity of rubber materials cannot be further improved, the effects of further reducing energy consumption and reducing the number of mixing sections are achieved, the formulas of some master batches with plasticity requirements such as viscous rubber sheet rubber materials, zero-degree belt ply rubber materials and the like, namely, the master batches produced by using the traditional series internal mixer still need to be dried for more than 3 sections, and the upper and lower mixing time can be simultaneously improved if the constant temperature mixing time is also arranged on the upper internal mixer for a certain time, the rubber mixing degree can be improved to a certain extent, the number of master batch mixing sections is reduced, but the production efficiency is obviously influenced and is not paid. As a rubber mixing machine in one-step mixing, in order to exert production efficiency, the upper internal mixer also does not suggest to set a variable-speed constant-temperature mixing process, the improvement of the mixing degree of the rubber mixing is mainly completed by long-time small-roll-spacing rubber tamping of an open mill in a lower auxiliary machine, but in actual production, a plurality of defects exist, high-hardness rubber materials such as rubber cores and seam allowance formulas cannot be produced, hydraulic overload of a roller of the open mill is easily caused by low roll spacing, large-viscosity rubber materials such as bonding layers, airtight layers, viscous rubber sheets and zero-degree belt layer formulas cannot be produced, stick and roll wrapping are easy, high mixing degree requirements such as production of viscous rubber sheet rubber materials and zero-degree belt layer rubber materials cannot be produced, and Mooney viscosity during one-step production is higher and cannot meet the production requirements.
Disclosure of Invention
In order to overcome the not enough of prior art, the utility model provides a multistation series connection banbury mixer smelts gluey production line can make every down the banbury mixer mixing cycle time reach the banbury mixer mixing cycle time N times to do not lose production efficiency, finally realized one section completion of masterbatch.
The utility model provides a technical scheme that its technical problem adopted is: a rubber mixing production line of a multi-station series internal mixer is provided with an upper internal mixer and is characterized in that the upper station is an upper internal mixer, the lower station of the upper internal mixer is provided with N lower internal mixers connected in parallel, N is an integer larger than or equal to 2, the next station of the N lower internal mixers connected in parallel is provided with an extruder, and the next station of the extruder is provided with a rubber sheet cooling and rubber collecting device.
The utility model discloses still can realize through following measure:
the upper internal mixer is a shearing rotor internal mixer or a meshing rotor internal mixer.
The beneficial effects of the utility model are that, the mixing time of internal mixer constant temperature can reach the N times of the mixing cycle of internal mixer down, the internal mixer effect under can the maximize performance, do not influence production efficiency, it is mixed to drop into 1 section with traditional multistage masterbatch, reduce cooling between the section number, the gluey energy consumption of gluing that the intensification brought, and select suitable constant temperature mixing temperature according to the formula performance, rotational speed range, the mixing time of constant temperature, the internal mixer carries out the mixing that is not more than N times and goes up the mixing cycle time of internal mixer down, do not influence sizing material physical properties, ageing back physical properties.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1, sizing material, 2, an upper internal mixer, 3, a first lower internal mixer, 4, a second lower internal mixer, 5, an Nth lower internal mixer, 6, an extruder and 7, a rubber sheet cooling and rubber collecting device.
Detailed Description
In the figure, the upper station of the utility model is an upper internal mixer 2, the lower station of the upper internal mixer 2 is provided with N lower internal mixers connected in parallel, N is an integer larger than or equal to 2, the next station of the N lower internal mixers connected in parallel is provided with an extruder 6, the next station of the extruder 6 is provided with a film cooling and rubber receiving device 7, the upper internal mixer 2 completes the mixing of a first vehicle rubber material 1 and then discharges to the lower station first lower internal mixer 3 for supplementary mixing, the upper internal mixer 2 continues to complete the mixing of a second vehicle rubber material 1 and then discharges to the lower station second lower internal mixer 4 for supplementary mixing, the upper internal mixer 2 continues to complete the mixing of the Nth vehicle rubber material 1 and then discharges to the lower station Nth lower internal mixer 5 for supplementary mixing, the mixing period of the lower internal mixer is less than N times of the mixing period of the upper internal mixer, the upper internal mixer 2 does not need to continue to complete the mixing of the Nth vehicle rubber material 1 and then discharges to the lower internal mixer 3 for supplementary mixing, the upper internal mixer 2 continuously produces rubber materials, the lower internal mixer circularly supplements and mixes the rubber materials, the N lower internal mixers connected in parallel sequentially convey the produced rubber materials to the extruder 6 through the conveying belt, and the rubber materials are discharged and then are cooled by the rubber sheet cooling and rubber collecting device 7 for later use.
The upper internal mixer 2 can select a shearing type rotor internal mixer which can quickly eat and quickly mix, and can also select a meshing type rotor internal mixer which can realize accurate constant temperature and variable rotating speed mixing.
The internal mixer which can realize accurate constant temperature (+ -1 ℃) and variable-speed mixing is selected from a plurality of lower-station parallel lower internal mixers, and the internal mixer is preferably an internal mixer with meshed rotors connected in series. The lower internal mixer maintains the temperature of the rubber material by shearing and rubbing the rubber material by the rotor, so that the rubber material is mixed at a certain temperature, the rotation speed is high, the heat generation is high, the temperature rise of the rubber material is high, the rotation speed of the lower internal mixer can not be too low to ensure the mixing effect of constant-temperature mixing, the rotation speed of the rotor in the whole constant-temperature mixing process is mostly within the range of 15-50rpm, therefore, the heat dissipation of the lower internal mixer is required to be good, the lower internal mixer is open and has a large capacity, the effective filling volume is larger than that of the upper internal mixer, and a reliable rotor, the side wall of the mixing chamber and a lower ram temperature control system are provided.
And (3) mixing process of an upper internal mixer: the feeding sequence can be designed according to the optimal performance of the formula, and the proper and higher glue discharging temperature which does not influence the performance of the formula is selected within the range of 120-180 ℃.
The mixing process of the internal mixer comprises the following steps: the variable-speed constant-temperature mixing temperature is 120-.
Analyzing an actual production case:
taking a traditional heavy-duty serial internal mixer IM550E/IM1000ET as an example, the rubber mixing production line of the multi-station serial internal mixer of the embodiment is analyzed to demonstrate the feasibility. The master batches of the comparative examples and the examples are mixed by an IM550E/IM1000ET heavy-duty series internal mixer, and the specific mixing process scheme is as follows:
comparative example: mixing 1 car of rubber material, wherein the rotating speed in the constant rotating speed mixing process is 50 r.min -1 The rotating speed in the constant-temperature mixing process is 5-50 r.min -1 . The first-stage mixing process comprises the following steps: adding NR, small materials, carbon black and white carbon black → a pressure weight 30s → a pressure lifting weight → a pressure weight, heating to 160 ℃ in the upper internal mixer → discharging rubber, heating to 155 ℃ in the lower internal mixer → maintaining 180s → discharging rubber; the two-stage mixing process comprises the following steps: adding a section of mixed rubber into an upper internal mixer → pressing weight 30s → pressure weight → temperature rise of the pressing weight to 160 ℃ → discharging rubber to a lower internal mixer → constant temperature of the lower internal mixer to 155 ℃, and keeping 140s → discharging rubber. The three-stage mixing process is the same as the two-stage mixing process.
In order to prevent the rubber compound performance from being affected by the constant-temperature mixing at a high temperature for a long time, the constant-temperature mixing temperature is specially adjusted to 150 ℃ in the embodiment, and other formulas should select proper constant-temperature mixing temperatures according to the formula performance.
The embodiment is as follows: the rotating speed of the constant rotating speed mixing process is 50 r.min -1 The rotating speed in the constant-temperature mixing process is 5-50 r.min -1 . The first-stage mixing process comprises the following steps: the previous mixing step is the same as the first mixing step of the comparative example, the temperature of the pressure weight in the last step is kept constant after being increased to 150 ℃, the temperature is kept for 150s → rubber discharge to the lower internal mixer → the temperature of the lower internal mixer is kept constant for 150 ℃, and the temperature is kept for 330s → rubber discharge; the two-stage mixing process is the same as the comparative example.
Comparative examples and examples Final mixing was carried out on a BB270 Banbury mixer line using the same mixing process.
TABLE 1 comparison of mixing time in masterbatch production
As can be seen from Table 1, 3 stages of mixing of the master batch of the comparative example are added into 1 stage of mixing of the master batch in a mode of 150s of variable-speed constant-temperature mixing process at 150 ℃, so that the variable-speed constant-temperature mixing process time of an upper internal mixer and a lower internal mixer can reach 480 s. Compared with a comparative example, the total mixing cycle time of all the stages of master batch in the embodiment can be shortened by 30s, the mixing time is prolonged by 7s, the auxiliary operation time of three-stage mixing is saved, the production efficiency is improved by 5%, but the one-stage mixing cycle time is increased by 148s, and the production efficiency is reduced by 37.4%.
TABLE 2 comparison of energy consumption
As can be seen from Table 2, the energy consumption generated by the variable-speed mixing mode of 148s in the third section of the comparative example is 372.7kJ/kg, the constant-speed constant-temperature mixing is respectively increased by 150s for the upper internal mixer and the lower internal mixer in the 1 section of the master batch mixing process in the example, the constant-temperature is changed to 150 ℃, the energy consumption is increased to 162.3kJ/kg, the energy consumption increased by the comparison ratio in the example is 56% lower, and the total energy consumption in the master batch mixing process is reduced by 16%, so that the effect of reducing the total energy consumption of mixing by reducing one section of master batch is obvious, and the energy consumption of variable-speed constant-temperature mixing in the same time is obviously lower than that of one section of master batch mixing.
TABLE 3 Mooney viscosity comparison of the stocks
| Item | Number of mixing stages | Comparative example | Examples |
| Mooney viscosity [ MS (2+4)100 DEG C] | 1-stage masterbatch | 67.5 | 59.5 |
| Mooney viscosity [ MS (2+4)100 DEG C] | 2-stage masterbatch | 47.2 | 42.1 |
| Mooney viscosity [ MS (2+4)100℃ ]] | 3-stage masterbatch | 34.9 | -- |
| Mooney viscosity [ ML (1+4)100 DEG C] | Final mixing | 54.6 | 60.5 |
It can be seen from table 3 that the constant temperature mixing time of 150s is increased by the upper internal mixer and the lower internal mixer of the masterbatch in the first embodiment, the mooney viscosity of the rubber material is decreased by 8 points compared with the proportion, the mixing degree of the rubber material is improved, the plasticity of the rubber material is increased, but the production efficiency is obviously reduced, if a novel series-connection internal mixer set is adopted, and N lower internal mixers without upper top bolts are connected in parallel, the constant temperature mixing time of the internal mixers can reach more than N248 s, and the constant temperature mixing time of the upper internal mixers does not need to be increased, so that the production efficiency cannot be reduced.
TABLE 4 physical Properties of the stocks
| Item | Comparative example | Examples |
| Vulcanization condition 150 ℃ x 30min | ||
| Shore A hardness/degree | 72 | 73 |
| Tensile strength/MPa | 23.1 | 22.0 |
| Elongation at break/100% | 363 | 356 |
| 100% stress at definite elongation/MPa | 4.7 | 4.7 |
| 300% stress at definite elongation/MPa | 19.0 | 18.7 |
| Aging at 100 deg.C for 48 hr | ||
| Shore A hardness/degree | 83 | 83 |
| Tensile strength/MPa | 13.1 | 13.7 |
| Elongation at break/100% | 129 | 130 |
| 100% stress at definite elongation/MPa | 10.2 | 10.5 |
| Vulcanization condition is 150 ℃ multiplied by 60min | ||
| Shore A hardness/degree | 73 | 73 |
| Tensile strength/MPa | 21.3 | 20.7 |
| Elongation at break/100% | 346 | 355 |
| 100% stress at definite elongation/MPa | 4.6 | 4.4 |
| 300% stress at definite elongation/MPa | 18.1 | 17.4 |
As can be seen from Table 4, the basic relations of Shore A type hardness, 100% stress at definite elongation, 300% stress at definite elongation, tensile strength and elongation at break of the two rubber materials are that the comparative example is slightly better than the embodiment, but the overall difference is not large, the embodiment of the physical properties after aging is better than the comparative example, which shows that the proper constant temperature mixing temperature is selected, even if the variable-speed constant temperature mixing process with the upper and lower internal mixers totally reaching 480s, the physical and mechanical properties of the rubber materials are not greatly influenced, and the aging resistance of the rubber materials can be even improved, which shows that the multi-station series internal mixer rubber mixing production line has feasibility.
Claims (2)
1. A rubber mixing production line of a multi-station series internal mixer is provided with an upper internal mixer and is characterized in that the upper station is an upper internal mixer, the lower station of the upper internal mixer is provided with N lower internal mixers connected in parallel, N is an integer larger than or equal to 2, the next station of the N lower internal mixers connected in parallel is provided with an extruder, and the next station of the extruder is provided with a rubber sheet cooling and rubber collecting device.
2. A mixing line of a multi-station series internal mixer according to claim 1, characterized in that said upper internal mixer is a shear type rotor internal mixer or a meshing rotor internal mixer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220835720.XU CN217257503U (en) | 2022-04-12 | 2022-04-12 | Rubber mixing production line of multi-station series internal mixer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220835720.XU CN217257503U (en) | 2022-04-12 | 2022-04-12 | Rubber mixing production line of multi-station series internal mixer |
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| CN217257503U true CN217257503U (en) | 2022-08-23 |
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| CN202220835720.XU Active CN217257503U (en) | 2022-04-12 | 2022-04-12 | Rubber mixing production line of multi-station series internal mixer |
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