A kind of filament special isoprene rubber granulation equipment

Abstract

The invention discloses a filamentary special isoprene rubber granulation equipment, comprising a melt extrusion device, a pelletizing device and a driving device. The melt extrusion device comprises a barrel, a screw and a template mechanism. A feed port is provided on the barrel, one end of the barrel is connected to the template mechanism, and a driving device is provided at the other end. The screw is arranged in the barrel, and the screw is connected to the output end of the driving device. The pelletizing device comprises a pelletizing motor, a cutter shaft, a cutter, a pelletizing box and a sealing component. The pelletizing motor is connected to the cutter shaft, and a cutter is provided on the cutter shaft. The sealing component is sleeved on the cutter shaft, one side of the pelletizing box is fixedly connected to the template mechanism, and the other side is fixedly connected to the sealing component, and an air blowing channel is provided in the sealing component. In the present invention, a sealing ring is provided between the sealing component and the pelletizing box, and a skeleton oil seal, a labyrinth and a nitrogen protection triple sealing mode are provided between the sealing component and the cutter shaft, which can strictly prevent the leakage of gases such as combustible gases, avoid environmental pollution and endanger production safety.

Description

Technical Field

[0001] The invention belongs to the technical field of synthetic rubber, and in particular relates to a filamentary special isoprene rubber granulation device. Background Art

[0002] Special isoprene rubber is isoprene rubber with special additives added. Special isoprene rubber has many excellent properties: first, its color is more transparent and bright, and it can replace molten butadiene styrene for use in camera lens protective film, etc.; second, compared with natural rubber, it is purer, has less gel, no impurities, uniform quality, no need for plasticization, easy mixing, and good thermal conductivity. It is called the synthetic rubber closest to natural rubber and can basically replace natural rubber in places of use. It is used in tires, tapes, hoses, shoes, industrial products, and is especially suitable for the manufacture of food products, medical and health products, etc.; third, it has good vibration absorption and electrical properties, and can be widely used in shock absorption of vibration equipment, etc.

[0003] Although special isoprene rubber has broad market prospects and huge economic value, its physical properties have also changed due to the addition of special additives on the basis of isoprene rubber. Special isoprene rubber has high viscosity, with a Mooney viscosity of 80-100; it is easy to agglomerate; it is sensitive to temperature control; the incoming material is loose (about φ2mm silk floss), which makes it more difficult to pressurize and extrude the equipment; the addition of special additives causes serious wear and corrosion to the equipment; because flammable gases are released during the production process, strict requirements are placed on the sealing and explosion-proof of the production equipment; it has high fluidity and is not easy to form. Compared with other synthetic rubbers, the quantitative production of special isoprene rubber is more difficult. Summary of the invention

[0004] The present invention aims at the above problems and designs a filamentous special isoprene rubber granulation equipment to change the shortcomings of the traditional special isoprene rubber granulation equipment, such as poor sealing, environmental pollution and equipment corrosion. The technical means adopted by the present invention are as follows:

[0005] A filamentary special isoprene rubber granulation equipment comprises a melt extrusion device, a pelletizing device and a driving device, the melt extrusion device comprises a barrel, a screw and a template mechanism, the barrel is provided with a feed port, one end of the barrel is connected to the template mechanism, and the other end is provided with a driving device, the screw is arranged in the barrel, and the screw is connected to the output end of the driving device, the pelletizing device comprises a pelletizing motor, a cutter shaft, a cutter, a pelletizing box and a sealing component, the pelletizing motor is connected to the cutter shaft, the cutter shaft is provided with a cutter, the sealing component is sleeved on the cutter shaft, one side of the pelletizing box is fixedly connected to the template mechanism, and the other side is fixedly connected to the sealing component, the side of the sealing component in contact with the cutter shaft is provided with an air outlet, the sealing component is provided with an air inlet, and an air blowing channel connecting the air inlet and the air outlet is provided in the sealing component.

[0006] Preferably, the sealing component is arranged along the circumferential direction of the cutter shaft, and at least one labyrinth chamber is provided on a side of the sealing component in contact with the cutter shaft.

[0007] Preferably, a skeleton oil seal is provided on the side of the sealing component in contact with the cutter shaft.

[0008] Preferably, the air outlet is connected to the maze chamber.

[0009] Preferably, it also includes a base, and the melt extrusion device, pelletizing device and driving device are all arranged on the base. The inner diameter of the air blowing channel decreases step by step from the air inlet to the air outlet. The sealing component is connected to the pelletizing box by bolts. Five maze chambers are provided on the sealing component, and the air outlet is connected to the maze chamber in the middle.

[0010] Preferably, a sealing ring is provided between the sealing component and the pelletizing box.

[0011] Preferably, the driving device comprises a driving motor and a reducer, the output end of the reducer is connected to the screw, and at least one skeleton oil seal is provided between the reducer and the barrel.

[0012] Preferably, the compression section of the screw is provided with a screw sleeve, the screw sleeve is provided with a screw ridge, the screw sleeve is provided with a positioning groove, the screw is provided with a positioning block cooperating with the positioning groove, the end of the screw is provided with a screw head, and the screw head is connected to the screw by a thread.

[0013] Preferably, the cylinder is a straight cylinder, the screw has a constant pitch, a bushing is provided inside the cylinder, a shear screw cooperating with the screw is provided on the cylinder, and hard alloy is laid on the inner wall of the bushing and the screw ridge of the screw sleeve.

[0014] Preferably, a jacket is provided on the cylinder, a steam inlet and a steam outlet are provided on the jacket, two annular grooves are provided between the jacket and the cylinder, the two annular grooves are respectively connected to the steam inlet and the steam outlet, and a steam through hole is provided between the two annular grooves.

[0015] Compared with the prior art, the beneficial effects of the filamentous special isoprene rubber granulation equipment described in the present invention are as follows:

[0016] 1. In the present invention, a sealing ring is provided on the side where the sealing component is connected to the pelletizing box, and a triple sealing method of "skeleton oil seal", "labyrinth" and "nitrogen protection" is provided on the side where the sealing component contacts the cutter shaft, which can strictly prevent the leakage of combustible gas and other gases, avoid polluting the environment and endangering production safety.

[0017] 2. The reducer of the present invention is directly connected to the cylinder, and two skeleton oil seals are arranged between the two, which can ensure the sealing between the cylinder and the reducer and prevent the leakage of combustible gas and other gases during the production process.

[0018] 3. The present invention can adopt a filamentous feeding method. Specifically, feeding through a straight cylinder can avoid the problem of difficult material feeding. The constant pitch can solve the problem of long feeding time and small feeding of filamentous feeding. The composite screw fins of the screw can increase the service life of the screw sleeve and the straight cylinder and reduce the cost. The equipment of the present invention can be used to realize the quantitative production of special isoprene rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 2 is a schematic cross-sectional structural diagram of the installation of the melt extrusion device in an embodiment of the present invention;

[0021] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of part A;

[0022] Figure 4 yes Figure 2 A schematic diagram of the enlarged structure of part B;

[0023] Figure 5 2 is a schematic diagram of the overall structure of the screw sleeve in an embodiment of the present invention;

[0024] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure of the AA surface;

[0025] Figure 7 1 is a schematic diagram of the side view structure of the screw sleeve in an embodiment of the present invention;

[0026] Figure 8 Schematic diagram of the installation structure of the screw sleeve in the embodiment of the present invention;

[0027] Fig. 9 yes Figure 8 Schematic diagram of the cross-sectional structure of the middle BB surface;

[0028] Fig.10 Schematic diagram of the external structure of the cylinder in the embodiment of the present invention;

[0029] Fig.11 yes Fig.10 Schematic diagram of the cross-sectional structure of the middle CC surface;

[0030] Fig.12 yes Fig.11 Schematic diagram of the cross-sectional structure of the middle DD surface;

[0031] Fig.13 yes Fig.11 Schematic diagram of the cross-sectional structure of the middle EE surface;

[0032] Fig.14 yes Fig.11 Schematic diagram of the cross-sectional structure of the FF surface.

[0033] In the figure, 1, melt extrusion device; 2, pelletizing device; 3, drive motor; 4, reducer; 5, base; 11, barrel; 12, screw; 13, template mechanism; 14, bushing; 15, shear screw; 16, feed inlet; 17, screw sleeve; 18, screw rib; 21, pelletizing motor; 22, cutter shaft; 23, cutter; 24, pelletizing box; 25, sealing component; 111, jacket; 112, steam inlet; 113, steam outlet; 114, annular groove; 115, steam through hole; 121, screw head; 122, positioning block; 171, positioning groove; 251, skeleton oil seal; 252, labyrinth chamber; 253, air blast channel; 254, sealing ring. DETAILED DESCRIPTION

[0034] like Figure 1-14 As shown, a filamentary special isoprene rubber granulation device includes a melt extrusion device 1, a pelletizing device 2, a driving device and a base 5, wherein the melt extrusion device 1, the pelletizing device 2 and the driving device are all installed on the welded base 5. The melt extrusion device 1 includes a barrel 11, a screw 12 and a template mechanism 13, wherein the screw 12 is arranged in the barrel 11, and a feed port 16 is arranged on the barrel 11. One end of the barrel 11 is connected to the template mechanism 13, and the other end is connected to the driving device. In view of the high fluidity and viscosity of the special isoprene rubber, the template mechanism 13 in this embodiment adopts a large die hole for discharging, and reduces the rotation speed of the cutter 23, which can reduce the over-expansion phenomenon caused by the instantaneous pressure reduction when the material is discharged.

[0035] The driving device includes a driving motor 3 and a reducer 4. The screw 12 is connected to the output end of the reducer 4. After the screw 12 is installed, it can be regarded as a cantilever beam structure, that is, the tail end of the screw 12 is connected to the reducer 4, and the head is cantilevered. Two skeleton oil seals 251 are arranged between the reducer 4 and the barrel 11. The skeleton oil seals 251 can ensure the sealing performance when the barrel 11 is directly connected to the reducer 4, prevent the leakage of combustible gas and other gases during the production process, and reduce pollution to the environment.

[0036] The pelletizing device 2 comprises a pelletizing motor 21, a cutter shaft 22, a cutter 23, a pelletizing box 24 and a sealing component 25. The pelletizing motor 21 is connected to the cutter shaft 22. The cutter shaft 22 is provided with a cutter 23 that cooperates with the template mechanism 13 for pelletizing. The pelletizing box 24 is arranged at the discharge side of the template mechanism 13. One side of the pelletizing box 24 is sealed and connected to the template mechanism 13, and the other side is sealed and connected to the cutter shaft 22 through the sealing component 25. The sealing component 25 is arranged along the circumferential direction of the cutter shaft 22. The sealing component 25 and the pelletizing box 24 are connected by bolts. An "O"-shaped sealing ring 254 is provided on the side of the sealing component 25 that contacts the pelletizing box 24 to ensure the sealing of the connection between the sealing component 25 and the pelletizing box 24 and prevent gas leakage in the pelletizing box 24.

[0037] An air blowing channel 253 is provided in the sealing component 25. An air outlet is provided on the side of the sealing component 25 that contacts the cutter shaft 22. An air inlet is provided on the sealing component 25. One end of the air blowing channel 253 is connected to the air inlet, and the other end is connected to the air outlet. The inner diameter of the air blowing channel 253 decreases stepwise from the air inlet to the air outlet. When the air inlet pressure is constant, reducing the aperture can increase the internal air supply pressure and flow rate, thereby providing sufficient pressure at the air outlet. During specific production, nitrogen is introduced into the air blowing channel 253 through the air inlet, and the introduced nitrogen will reach the air outlet through the air blowing channel 253, thereby sealing the cutter shaft 22 at the air outlet. Figure 3 As shown, the branch channel arranged in the air blowing channel 253 in this embodiment is a process hole when the air blowing channel 253 is processed, so as to ensure simple processing.

[0038] The side of the sealing component 25 in contact with the cutter shaft 22 is provided with five labyrinth chambers 252, which are arranged in sequence along the axial direction of the cutter shaft 22, and can reduce the gas leakage in the pelletizing box 24. The side of the sealing component 25 in contact with the cutter shaft 22 is also provided with a skeleton oil seal 251, which is arranged on the side of the five labyrinth chambers 252 away from the pelletizing box 24. The skeleton oil seal 251 can enhance the sealing performance, further prevent the gas leakage in the pelletizing box 24, and also prevent the gas in the air blowing channel 253 from leaking out.

[0039] The air outlet of the air blast channel 253 is connected to the labyrinth chamber 252, so that the nitrogen introduced is evenly distributed along the circumferential direction of the cutter shaft to ensure good sealing everywhere. In this embodiment, the air outlet is connected to a labyrinth chamber in the middle of the five labyrinth chambers 252 (i.e., there are two labyrinth chambers 252 on both sides of the air outlet), which can reduce the impact of nitrogen gas on the material in the box and prevent the pelletizing box 24 from being blocked due to the impact of the air flow. At the same time, the labyrinth chamber 252 can also prevent nitrogen gas from leaking to the outside.

[0040] The cutter shaft 22 adopts the above-mentioned "skeleton oil seal", "labyrinth" and "nitrogen protection" matching sealing mode, which can strictly prevent the leakage of combustible gas in the pelletizing box 24. The pelletizing box 24 is provided with an exhaust port for exhausting gas and a discharge port for collecting rubber pellets. When the pelletizing box 24 is sealed and connected with the template mechanism 13 and the cutter shaft 22, the waste gas in the production process of the rubber pellets can be discharged and processed through the exhaust port in a centralized manner, which will not pollute the environment and endanger production safety.

[0041] The barrel 11 is a straight barrel. For the filament-like feeding method, the straight barrel is used to feed the material instead of the traditional conical barrel, which can avoid the problems of difficult feeding, difficult transportation, and screw return. The inner part of the barrel 11 corresponding to the compression section is equipped with a bushing 14, and the inner wall of the bushing 14 is welded with hard alloy to increase its wear resistance and ensure the service life of the barrel 11. The barrel 11 is provided with a shear screw 15 that cooperates with the compression section of the screw 12. When the screw 12 rotates, the shear screw 15 can peel off the material adhered to the shaft of the screw 12 to prevent the material from sticking to the shaft and causing blockage.

[0042] The screw 12 has a constant pitch, which can solve the problem of long feeding time and small feeding of filamentous materials. At the same time, the depth of the feeding screw groove is increased, which can achieve the advantages of fast feeding, rapid conveying and short pressurization time.

[0043] The screw 12 adopts a composite screw ridge, and the screw ridge of the feeding section of the screw 12 is welded to the screw 12. The compression section of the screw 12 is provided with a screw sleeve 17, and the screw ridge 18 is welded on the screw sleeve 17. The feeding section of the screw 12 is subjected to the largest bending moment, and the probability of friction with the inner wall of the barrel 11 is also the smallest. The welded screw ridge and the screw 12 are an integrated structure, which can avoid the occurrence of shaft breakage; the screw ridge 18 of the compression section of the screw 12 is a screw sleeve connection. If there is wear, the screw sleeve 17 can be directly replaced to reduce the cost of equipment replacement. Hard alloy is welded on the screw ridge 18 of the screw sleeve 17 to increase its wear resistance, increase the service life of the screw sleeve 17 and the straight barrel, and reduce costs.

[0044] A strip-shaped positioning groove 171 is provided in the axial direction of the screw sleeve 17, and a positioning block 122 matching the positioning groove 171 is provided on the outer side of the compression section of the screw rod 12, and the positioning block 122 is fixed to the screw rod 12 by screws. The screw sleeve 17 and the positioning groove 171 are fixed by the positioning groove 171 and the positioning block 122, so as to ensure that there is no relative rotation between the screw sleeve 17 and the positioning groove 171. A screw head 121 is provided at the end of the screw rod 12, and the screw head 121 is connected to the screw rod 12 by a thread. After the screw head 121 is connected and fixed to the screw rod 12, the peripheral edge of the screw head 121 will fix the axial direction of the screw sleeve 17 to prevent the axial movement of the screw sleeve 17.

[0045] For the granulation of special isoprene rubber, due to the high viscosity of the material, the radial force at the discharge end of the screw 12 is likely to cause the screw 12 to bend, resulting in friction between the screw ribs and the inner wall of the barrel 11, which causes serious corrosion and wear to the equipment. Therefore, the aspect ratio of the screw 12 can be reduced to reduce the wear between the screw ribs and the inner wall of the barrel 11 and avoid the generation of metal glue.

[0046] The barrel 11 is provided with a jacket 111, and a steam inlet 112 and a steam outlet 113 are provided on the jacket 111. Two annular grooves 114 are formed between the jacket 111 and the barrel 11, and the two annular grooves 114 are respectively connected to the steam inlet 112 and the steam outlet 113, and a steam through hole 115 is provided between the two annular grooves 114. When it is needed, hot steam is introduced from the steam inlet 112, and the hot steam will fill the first annular groove 114, and enter the second annular groove 114 through the steam through hole 115. After heat exchange with the barrel 11 in the annular groove 114, the steam temperature is reduced and then discharged from the steam outlet 113. The straight barrel adopts an external jacket structure, which can accurately control the temperature of the compression section to avoid the influence of temperature changes on material extrusion.

[0047] The working principle of the present invention is: the screw 12 is driven to rotate by the driving motor 3 and the reducer 4 to push the rubber material to move toward the template, wherein the reducer 4 is directly connected to the screw 12, and a skeleton oil seal 251 is used to reduce the leakage points of combustible gas in the production process. The rubber particles extruded from the template are pelletized by the cutter 23 and fall into the pelletizing box 24 for collection. A sealing component 25 for sealing is provided between the pelletizing box 24 and the cutter shaft 22. One side of the sealing component 25 is connected to the pelletizing box 24 by bolts and is provided with a sealing ring 254 to ensure sealing performance; the sealing component 25 is sleeved on the cutter shaft 22, and the side of the sealing component 25 in contact with the cutter shaft 22 is provided with a triple sealing method of "skeleton oil seal" + "labyrinth" + "nitrogen protection", which can strictly prevent the leakage of combustible gas and other gases, avoid environmental pollution and endanger production safety.

[0048] The present invention discloses a special isoprene rubber filament feed, which can be used for the following specific quantitative production design conditions and design indicators through extrusion, hot melting, extrusion and granulation of special extrusion equipment:

[0049] 1) Annual output is 10,000 tons;

[0050] 2) Equipment production flexibility is 40%-110%;

[0051] 3) The specifications of the finished material are particle size ≤20mm and length ≤10mm;

[0052] 4) The bulk density of the finished material is 0.5g / cm 3 ;

[0053] 5) The temperature difference between inlet and outlet materials is ≤20℃;

[0054] 6) The product material is uniform, without metal material or agglomerate;

[0055] 7) Prevent leakage of flammable gas.

[0056] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A filamentary special isoprene rubber granulation equipment, characterized in that: The invention comprises a melt extrusion device (1), a pelletizing device (2) and a driving device. The melt extrusion device (1) comprises a barrel (11), a screw (12) and a template mechanism (13). The barrel (11) is provided with a feed port (16). One end of the barrel (11) is connected to the template mechanism (13), and the other end is provided with a driving device. The screw (12) is arranged in the barrel (11), and the screw (12) is connected to the output end of the driving device. The pelletizing device (2) comprises a pelletizing motor (21), a cutter shaft (22), a cutter (23), a pelletizing box (24) and a sealing member. component (25), the pelletizing motor (21) is connected to the cutter shaft (22), the cutter shaft (22) is provided with a cutter (23), the sealing component (25) is sleeved on the cutter shaft (22), one side of the pelletizing box (24) is fixedly connected to the template mechanism (13), and the other side is fixedly connected to the sealing component (25), a side of the sealing component (25) in contact with the cutter shaft (22) is provided with an air outlet, the sealing component (25) is provided with an air inlet, and an air blowing channel (253) communicating with the air inlet and the air outlet is provided in the sealing component (25); The sealing component (25) is arranged along the circumferential direction of the cutter shaft (22), and five labyrinth chambers (252) are provided on the side of the sealing component (25) in contact with the cutter shaft (22); A skeleton oil seal (251) is provided on the side of the sealing component (25) that contacts the cutter shaft (22); The gas outlet is connected to the maze chamber (252); It also includes a base (5), the melt extrusion device (1), the pelletizing device (2) and the driving device are all arranged on the base (5), the inner diameter of the air blowing channel (253) decreases in steps from the air inlet to the air outlet, the sealing component (25) is connected to the pelletizing box (24) by bolts, the air outlet is connected to the middle labyrinth chamber (252), and the skeleton oil seal (251) is arranged on the side of the five labyrinth chambers (252) away from the pelletizing box (24).

2. The filamentary special isoprene rubber granulation equipment according to claim 1, characterized in that: A sealing ring (254) is provided between the sealing component (25) and the pelletizing box (24).

3. The filamentous special isoprene rubber granulation equipment according to claim 1, characterized in that: The driving device comprises a driving motor (3) and a reducer (4); the output end of the reducer (4) is connected to the screw (12); and at least one skeleton oil seal (251) is provided between the reducer (4) and the barrel (11).

4. The filamentary special isoprene rubber granulation equipment according to claim 1, characterized in that: The compression section of the screw rod (12) is provided with a screw sleeve (17), the screw sleeve (17) is provided with a screw ridge (18), a positioning groove (171) is provided inside the screw sleeve (17), a positioning block (122) cooperating with the positioning groove (171) is provided outside the screw rod (12), a screw head (121) is provided at the end of the screw rod (12), and the screw head (121) is connected to the screw rod (12) by a thread.

5. The filamentary special isoprene rubber granulation equipment according to claim 4, characterized in that: The barrel (11) is a straight barrel, the screw (12) has a constant pitch, a bushing (14) is provided inside the barrel (11), a shear screw (15) is provided on the barrel (11) and matches the screw (12), and hard alloy is laid on the inner wall of the bushing (14) and the screw ridge (18) of the screw sleeve (17).

6. A filamentary special isoprene rubber granulation equipment according to claim 4 or 5, characterized in that: The cylinder (11) is provided with a jacket (111), the jacket (111) is provided with a steam inlet (112) and a steam outlet (113), two annular grooves (114) are provided between the jacket (111) and the cylinder (11), the two annular grooves (114) are respectively connected to the steam inlet (112) and the steam outlet (113), and a steam through hole (115) is provided between the two annular grooves (114).

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