WO2019210560A1

WO2019210560A1 - Device for preparing granular reclaimed rubber

Info

Publication number: WO2019210560A1
Application number: PCT/CN2018/093005
Authority: WO
Inventors: 袁源; 李青青; 冯磊; 蒋松涛; 周鹏程
Original assignee: 江苏睿博环保设备有限公司
Priority date: 2018-05-04
Filing date: 2018-06-27
Publication date: 2019-11-07
Also published as: KR20210010479A

Abstract

Disclosed is a device for preparing granular reclaimed rubber, the device comprising a machine base, wherein a first screw extruder for plasticization and a second screw extruder for plastification are provided on the machine base; the first screw extruder and the second screw extruder are respectively provided, at feeding ports, with a feeding device; and the feeding device at the feeding port of the second screw extruder is connected to a discharge port of the first screw extruder. The first screw extruder and the second screw extruder are connected to a temperature control device. The present invention solves the problem of traditional technology being highly polluting. Thermochemical desulfuration is carried out without steam or water, and both the plasticization process and the plastification process are carried out in a totally enclosed system. Moreover, the reclaimed rubber has a low temperature after plastification, thus generating no exhaust gas, thereby solving secondary pollution due to exhaust gas and waste water.

Description

Particle regeneration rubber preparation device

Technical field

The invention relates to the technical field of waste rubber regeneration, in particular to a preparation device of particle regeneration rubber.

Background technique

As an important strategic material, rubber has strict control over it. China is a big country in rubber use. It is also a country with extremely scarce rubber resources and a large amount of waste rubber. About 70% of the annual rubber consumption is imported from abroad. China's General Administration of Customs announced in 2016 that China imported 2.5 million tons of natural rubber. In 2016, China's tire production reached 610 million, ranking first in the world. The number of used tires produced in the year exceeded 300 million, about 10 million tons. Therefore, the reuse and reproduction of waste rubber has far-reaching significance for China to get rid of the shortage of rubber resources. In order to solve the shortage of rubber resources in China, China has been advocating, encouraging and supporting the recycling of used rubber and the production of recycled rubber. At present, China basically adopts dynamic desulfurization tanks and automatic rubber plasticizing devices. The main disadvantages of the dynamic desulfurization tank are as follows: 1. Secondary pollution: The dynamic desulfurization process is to avoid the carbonization caused by the uneven heating of the rubber powder. It is necessary to add a certain proportion of water, and the water and the regenerant react under high temperature conditions. A large amount of organic gas, although the exhaust gas has been treated, but it can not solve the secondary pollution problem at present; 2. Poor safety: the current working pressure of the dynamic desulfurization process is 1.6-3.5MPa, and the H-type pressure vessel is required. The use will cause the tank wall to become thin and cause safety hazards. Once improper operation will lead to equipment and personal accidents; 3. High energy consumption: due to the thick wall of the tank, the heat transfer speed is slow, the efficiency is low, and the energy consumption is high; 4. The quality is unstable: Due to the large tank, the stirring speed is slow, the mixing is uneven, and the process of the tank wall is not well controlled due to the extension of the tank wall. The uneven quality of the desulfurized rubber is fluctuating and unstable, and it is easy to block the sticky spiral and the broken wheel. The equipment is not durable, and the quality of the products produced by different operators fluctuates greatly; 5. The plasticized plastic powder passes through 3 to 6 open-type rubber and refiners, and has been plasticized. A large amount of organic waste in fugitive emissions, exhaust gas passing through the collection process or it is difficult to collect and process all the low degree of automation and high labor costs. The conventional dynamic desulfurization tank or screw extrusion desulfurization temperature is 260 ° C -330 ° C, high temperature production, generating a large amount of exhaust gas and heat energy loss, which has an adverse impact on environmental damage and energy consumption.

Summary of the invention

OBJECT OF THE INVENTION: To overcome the deficiencies in the prior art, the present invention provides a device for preparing a particle reclaimed rubber

Technical Solution: In order to solve the above technical problem, a preparation device for a granular reclaimed rubber of the present invention comprises a machine base on which a first screw extruder for plasticizing and a second screw for mastication are arranged Exiting, the feeding ports of the first screw extruder and the second screw extruder are respectively provided with a feeding device, the feeding device of the feeding port of the second screw extruder and the discharging port of the first screw extruder Connecting; the first screw extruder and the second screw extruder are connected to the temperature control device.

Wherein, the first screw extruder is a single-screw extruder, which comprises a screw barrel, the thread of the screw in the barrel is separated by a DEM double screw groove, a pineapple mixing head, an Eagan chute barrier thread, a split type The mixing head is composed of a Saxton mixing head and a Dulmage mixing head.

Among them, the thread on the screw is set to 6-12 segments, and each segment of the thread adopts DEM double groove separation thread, pineapple mixing head, Eagan chute barrier thread, split mixing head Saxton mixing head, Dulmage mixing head One of them.

Among them, when the screw adopts DEM double screw groove separation thread, Eagan chute barrier thread, split type mixing head Saxton mixing head, Dulmage mixing head, pineapple mixing head, the length of each section occupies The ratio of the total length of the screw thread is: DEM double groove separation thread is 35-45%, Eagan chute barrier type thread is 15-25%, and the split mixing head Saxton mixing head is 15-25%, Dulmage mixing The head is 5-15% and the pineapple mixing head is 5-15%.

Wherein, a plurality of pins are arranged in a portion of the screw barrel corresponding to the DEM double screw groove.

Wherein, the first screw extruder and the second screw extruder are provided with a water passage for cooling.

Wherein, an axial expansion eliminating mechanism for eliminating the displacement generated by the axial directions of the first screw extruder and the second screw extruder is disposed on the base, and the first screw extruder and the second screw extruder are respectively The axial expansion eliminates the mechanism support.

Wherein, the axial expansion eliminating mechanism comprises two sets of linear guide rails which are arranged on the machine base and are respectively axially parallel with the first screw extruder and the second screw extruder, and each of the linear guide rails is respectively provided with a plurality of supports for supporting The slider of the first screw extruder or the second screw extruder.

Wherein, the feed screw of the first screw extruder is provided with a forced feeding screw, and the feeding port of the second screw extruder is provided with a T-screw material transfer device.

Wherein, a displacement eliminating member is disposed between the second screw extruder and the T-screw material transfer device.

Advantageous Effects: The present invention has the following beneficial effects:

It solves the problem of high pollution of traditional technology. There is no steam and water involved in thermal chemical desulfurization. The plasticization process and the mastication process are carried out in a fully enclosed system, and the temperature of the reclaimed rubber after mastication is low, no waste gas is generated, and the exhaust gas is solved. Secondary pollution of wastewater. Extrusion using a single-screw extruder plus a twin-screw extruder overcomes the high energy consumption caused by the mastication process of three to six open mills, large floor space, serious exhaust pollution, and high labor intensity. The problems of low production efficiency and high operating cost greatly simplify the post-treatment process of the desulfurizer, with low energy consumption and small floor space. It can realize fully automated continuous production, stable and reliable work, effectively improve the production efficiency of plasticizing and mastication, reduce the operating cost of equipment, solve the problem of elongation during heating of ordinary screw production equipment, and ensure the stability of the whole set of equipment. Sex.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention;

Figure 2 shows the Saxton mixing head of the split mixing head.

Figure 3 is a schematic view showing the structure of a Dulmage mixing head;

Figure 4 is a schematic view showing the structure of a pineapple mixing head;

Figure 5 is a schematic view of the DEM double screw groove separation thread structure;

Figure 6 is a schematic view of the Eagan chute barrier type thread structure;

Figure 7 is a schematic view showing the structure of the oppositely meshing double helix thread;

Figure 8 is a schematic structural view of a reciprocating water channel;

Figure 9 is a schematic cross-sectional view of a reciprocating water channel;

Figure 10 is a schematic view showing the structure of a wraparound water channel;

Figure 11 is a schematic cross-sectional view of a wraparound water channel.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 to 7, the present invention comprises a machine base on which a first screw extruder 7 for plasticizing and a second screw extruder 17 for mastication are provided, the first screw extrusion The feeding ports of the machine 7 and the second screw extruder 17 are respectively provided with a feeding device, the feeding device of the first screw extruder 7 is a forced feeding screw 3, and the feeding device of the second screw extruder 17 is The T-screw transfer device 12, the T-screw transfer device 12 is connected to the discharge port of the first screw extruder 7, and the first screw extruder 7 and the second screw extruder 17 are connected to the temperature control device. The first screw extruder 7 is a single screw extruder for plasticization, and the second screw extruder 17 is a twin screw extruder for mastication. The first screw extruder 7 includes a screw barrel 4, and the screw thread in the barrel 4 may be in the form of a DEM double groove separation thread 104, a pineapple mixing head 103, an Eagan chute barrier type thread 105, and a split type mixing. The head Saxton mixing head 101 and the Dulmage mixing head 102 are composed. The thread on the screw is set to 6-12 segments, each of which can be one of the above threads. When the screw is made of DEM double groove separation thread, Eagan chute barrier thread, split mixing head Saxton mixing head, Dulmage When there are many kinds of mixing heads and pineapple mixing heads, the ratio of the length of each thread to the total length of the screw thread is: DEM double groove separation thread is 35-45%, Eagan chute barrier type thread is 15-25 %, split-type mixing head Saxton mixing head is 15-25%, Dulmage mixing head is 5-15%, pineapple mixing head is 5-15%.

As a preferred embodiment, the thread of the screw in the barrel 4 is composed of a DEM double groove separation thread 104, a pineapple mixing head 103, a DEM double groove separation thread 104, a DEM double groove separation thread 104, The Eagan chute barrier type thread 105, the split type kneading head Saxton kneading head 101, the DEM double groove separation thread 104, the Dulmage kneading head 102, and the pineapple kneading head 103 are sequentially connected. The ratio of the length of the DEM double groove separation thread 104, the Eagan chute barrier thread 105, the split mixing head Saxton mixing head 101, the Dulmage mixing head 102, and the pineapple mixing head 103 to the total length of the screw thread is: DEM The double groove separation thread 104 is 40%, the Eagan chute barrier type thread 105 is 20%, the split type mixing head Saxton mixing head 101 is 20%, the Dulmage mixing head 102 is 10%, and the pineapple mixing head 103 is 103%. It is 10%. A plurality of pins 6 are provided in the portion of the barrel corresponding to the DEM double groove separation thread 104. The spiral barrel of the first screw extruder 7 and the Eagan chute barrier type thread 105, the split type mixing head Saxton mixing head 101, the Dulmage mixing head 102, and the pineapple mixing head 103 are provided with a wraparound water passage 302, and the spiral is provided. The other part of the cylinder adopts a reciprocating water channel 301, as shown in Figs. 8-11, and the structure of the water channel is a prior art structure. The second screw extruder 17 is a twin-screw extruder comprising a barrel and a plastic twin screw provided in the barrel, the barrel being provided with a reciprocating water channel and a wraparound water channel. The waterway structure is shown in Figure 8-10.

An axial expansion eliminating mechanism for eliminating the displacement generated by the axial directions of the first screw extruder 7 and the second screw extruder 17 is provided on the base 19, the first screw extruder 7 and the second screw extruder 17 is supported by an axial expansion eliminating mechanism, respectively. The axial expansion eliminating mechanism comprises two sets of linear guide rails disposed on the machine base and axially parallel with the first screw extruder 7 and the second screw extruder 17, respectively, and each of the linear guide rails is respectively provided with a plurality of supports The slider of the first screw extruder 7 or the second screw extruder 17. The feed inlet of the first screw extruder 7 is provided with a forced feed screw, and the feed port of the second screw extruder 17 is provided with a T-screw transfer device. A displacement eliminating member 14 is provided between the second screw extruder 17 and the T-screw feeder.

Specifically, as shown in FIG. 1 to FIG. 7, the raw materials are put into the forced feeding screw 3 according to the equipment capacity, and the feeding screw 3 is forcibly conveyed to the first screw extruder 7; the motor 1 and the speed reducer 2 Connected, the reducer 2 is connected to the first screw extruder 7, and the first screw extruder 7 is rotated by the motor 1 through the speed reducer 2. The single screw in the first screw extruder 7 is provided with a special thread form. Mainly for the material, through the precise design of the DEM double groove separation thread 104, the compression function can be performed and the powder material can be melted and separated, and the pin 6 can play the role of stirring and mixing the uniform material and provide a certain shearing function. The Eagan chute barrier thread 105 can be seen as part of the thread. Its small pressure loss increases the pressure, and its inlet groove depth becomes shallower until the focus becomes zero. On the contrary, the outlet groove depth gradually deepens. Reduce material storage, self-cleaning property, prevent material decomposition and provide strong shearing action, shunt mixing head Saxton mixing head 101, Dulmage mixing head 102 and pineapple mixing head 103 can achieve material crossover, transposition and diversion Mixing purposes and to provide a strong shear capacity material, scrap rubber particles 4 and forward flow in a single screw plasticating screw barrel.

As shown in Figures 8-10, the barrel 4 is provided with a reciprocating water channel circulation 301 and a wraparound water channel cycle 302, wherein the DEM double groove separation thread 104 is used with the pin 6, and the DEM double groove separation thread 104 is correspondingly sleeved. The water channel used in the portion on the cylinder 4 is a reciprocating water channel circulation 301, an Eagan chute barrier type thread 105, a split mixing head Saxton mixing head 101, a Dulmage mixing head 102, and an outer sleeve of a pineapple mixing head 103. The waterway used is a wraparound waterway loop 302.

At the same time, the feeding screw 3 is continuously ensured to ensure balanced material feeding, which ensures the feeding amount of the waste rubber in the plasticized single-screw barrel 4, and can quantitatively and evenly feed according to the set parameters, thereby ensuring the regeneration of waste rubber. The quality uniformity; the control unit 23 controls the reciprocating water channel circulation 301 of the plasticized single-screw barrel 4 and the wraparound water channel cycle 302 by the thermostat control structure 5 through a mold temperature machine (the control range is from room temperature to 300 ° C). The arrangement of the water passages is based on the different thread forms and designs of the first screw extruder 7, and is ensured in a reasonable position to ensure that the temperature of the first screw extruder 7 is between 80 °C and 220 °C.

The barrel 4 can be supported and slid by a linear guide 8 as an axial expansion eliminating mechanism, but is not limited to a guide rail on which the barrel 4 can be supported by a slider, a roller or the like.

Gas or liquid contained in the raw material, such as low molecular volatiles, unreacted monomers, liquid carrier, solvent, and volatile components in the auxiliary agent, etc., need to be eliminated in time. If it cannot be excluded, it will affect physical and mechanical properties. In addition to the decrease in chemical properties and electrical properties, defects such as voids, blistering, and acne on the surface or inside of the product may also seriously affect the appearance and performance of the product. The exhaust gas collection and treatment device 13 adopts the UV photocatalyst technology, but is not limited to the technology, and collects and processes the exhaust gas generated during the operation of the device, thereby effectively improving the material quality;

The displacement eliminating member 14 employs a metal expansion joint, a metal tube compensator, a bellows, etc., and can ensure displacement of the first screw extruder 7 and the plasticized single-screw barrel 4 after being heated, and eliminate displacement.

The degree of plasticization regeneration is controlled by the on-line monitoring device 11, and the displacement eliminating member 14 is connected by a T-type screw transfer device 12 in a closed elastic connection manner (including but not limited to a metal expansion joint, a metal tube compensator, a bellows, etc.) It is fed into the second screw extruder 17.

The second screw extruder 17 is driven by the motor 9 through the speed reducer 10 to pass through the designed counter-intermeshing double-screw thread 201, and the part of the thread has an adaptive creation and improvement for the rubber material, and can be sheared and mixed. The waste rubber particles are caused to flow forward in the barrel 15.

The reciprocating water channel circulation 301 and the wraparound water channel cycle 302 and the second screw extruder 17 of the masticating twin screw barrel 15 are controlled by the thermostatic control structure 5 through a mold temperature controller control unit (the control range is from room temperature to 100 ° C). The arrangement of the two water channels is based on the different thread forms of the first screw extruder 7 and is carefully designed and guaranteed to be in a reasonable position to ensure a temperature of 60 ° C - 80 ° C.

The barrel 15 of the second screw extruder 17 is supported by the linear guide 18, but is not limited to the guide rail. The guide rail is provided with a slider, a roller, etc., and the screw 15 is supported by a slider roller or the like, thereby eliminating the shaft generated by the thermal expansion of the barrel. Displacement.

The on-line monitoring device 11 is capable of monitoring the plasticizing degree and mastication degree of the waste rubber, and transmitting the monitored data to the automatic control system for data processing, and then the system is adjusted by the reciprocating water channel circulation 301 and the wraparound water channel cycle 302 according to a special algorithm. The constant temperature control device I5, the constant temperature control device II16, the forced feeding screw 3 and the matching automatic feeding device are controlled and fed back to control the temperature and the feeding amount in real time to ensure the material quality and realize the automatic control. The T-screw transfer device 12 is connected to the second screw extruder 17 in a closed elastic connection manner to ensure the closed conveying of the material, no exhaust gas discharge, and the volatiles are recondensed back to the material for reuse;

The mold temperature control unit processes the results of the on-line monitoring device 11 by the temperature control action of the mold temperature machine, so that the temperature of the screw and the sleeve is controlled within the required range by the reciprocating water channel cycle 301 and the wraparound water channel cycle 302. It realizes full automation, continuous and unmanned production from waste rubber to pellet reclaimed rubber without any waste water and exhaust gas.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

A device for preparing a particle reclaimed rubber, comprising: a machine base on which a first screw extruder for plasticizing and a second screw extruder for mastication are provided, and the first screw is extruded The feeding port of the machine and the second screw extruder are respectively provided with a feeding device, and the feeding device of the feeding port of the second screw extruder is connected with the discharging port of the first screw extruder; the first screw extruder A temperature control device is connected to the second screw extruder.
The apparatus for preparing a particle reclaimed rubber according to claim 1, wherein the first screw extruder is a single-screw extruder comprising a barrel, and the thread of the screw in the barrel is separated by a DEM double groove. Thread, pineapple mixing head, Eagan chute barrier thread, split mixing head Saxton mixing head, Dulmage mixing head.
The apparatus for preparing a particle reclaimed rubber according to claim 2, wherein the thread on the screw is provided with 6-12 segments, and each segment of the thread adopts a DEM double groove separation thread, a pineapple mixing head, and an Eagan chute barrier type. One of the threaded, split-type mixing head Saxton mixing head and Dulmage mixing head.
The apparatus for preparing a particle reclaimed rubber according to claim 2, wherein: the screw adopts a DEM double groove separation thread, an Eagan chute barrier type thread, a split type mixing head Saxton mixing head, and a Dulmage mixing head. When there are many kinds of pineapple mixing heads, the ratio of the length of each thread to the total length of the screw thread is: DEM double groove separation thread is 35-45%, Eagan chute barrier thread is 15-25%, diversion The mixing head of the Saxton mixing head is 15-25%, the Dulmage mixing head is 5-15%, and the pineapple mixing head is 5-15%.
The apparatus for preparing a particle reclaimed rubber according to claim 2, wherein a plurality of pins are provided in a portion of the barrel corresponding to the DEM double groove separation thread.
The apparatus for producing a particulate reclaimed rubber according to claim 1, wherein the first screw extruder and the second screw extruder are provided with a water passage for cooling.
The apparatus for preparing a particle reclaimed rubber according to claim 1, wherein an axial expansion eliminating mechanism for eliminating displacement generated by axial directions of the first screw extruder and the second screw extruder is provided on the machine base. The first screw extruder and the second screw extruder are respectively supported by the axial expansion eliminating mechanism.
The apparatus for preparing a particle reclaimed rubber according to claim 7, wherein the axial expansion eliminating mechanism comprises two axially parallel shafts disposed on the machine base and respectively respectively of the first screw extruder and the second screw extruder. The linear guide rails are respectively arranged on the linear guide rails with a plurality of sliders for supporting the first screw extruder or the second screw extruder.
The apparatus for preparing a particle reclaimed rubber according to claim 1, wherein a feed screw of the first screw extruder is provided, and a feed screw of the second screw extruder is provided with a T-screw transfer device. .
The apparatus for producing a particulate reclaimed rubber according to claim 9, wherein a displacement eliminating member is provided between the second screw extruder and the T-screw feeder.