A regenerating rubber forming device and a method for preparing regenerating rubber

Abstract

The application relates to the field of plastic state material injection molding technology, in particular to a regenerated rubber molding device and a preparation method of regenerated rubber, which comprises a molding cylinder, a molding shaft rotatingly arranged in the molding cylinder, a blade and a driving piece connected to the molding shaft and used for driving the molding shaft to rotate; the molding cylinder is sequentially divided into a pressurizing section, a compression section and an output section along the rubber conveying direction of the molding shaft; the blade comprises pressurizing spiral blades formed on the molding shaft and corresponding to the pressurizing section and output spiral blades corresponding to the position of the output section, the spiral angle of the pressurizing spiral blades is greater than that of the output spiral blades, and the compression section is provided with an exhaust assembly used for exhausting the gas in the rubber. The application can significantly reduce the bubbles existing in the extrusion molding production of the regenerated rubber.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plastic state material injection molding technology, in particular to a regenerated rubber molding device and a preparation method of regenerated rubber. BACKGROUND

[0002] Rubber is one of the most widely used materials at present, especially in China as one of the largest consumer countries, the demand for rubber and the amount of waste rubber are relatively large. Regenerated rubber can convert recycled rubber products into alternative resources, on the one hand, it can alleviate the resource problem, on the other hand, the recycling of regenerated rubber can convert waste rubber products into alternative resources, reduce production cost and pollution.

[0003] The production of regenerated rubber is different from that of virgin rubber. In the production of secondary recycled regenerated rubber, due to the fact that the regenerated rubber contains a large amount of water and low molecular volatile substances (such as residual softening agent), which rapidly vaporize to form a gas source during the extrusion heating stage (> 50℃); and the internal micro-pores of the regenerated rubber molecular chain are broken, causing the gas to be easily trapped and difficult to discharge, resulting in the production of bubbles during the current molding process of regenerated rubber, which leads to relatively low quality of rubber products.

[0004] In the prior art, the molding of regenerated rubber often uses a screw extruder, which extrudes the rubber through the screw, and in this process, the screw plays a mixing role on the rubber. Although the extrusion and molding of the rubber can be continuously carried out, some bubbles will still be produced in this process. Therefore, how to reduce the bubbles in the regenerated rubber is a problem that needs to be solved at present. SUMMARY

[0005] In order to significantly reduce the bubbles existing in the extrusion molding production of regenerated rubber, the present application provides a regenerated rubber molding device and a preparation method of regenerated rubber.

[0006] The regenerated rubber molding device and the preparation method of regenerated rubber provided by the present application adopt the following technical solutions:

[0007] In a first aspect, the present application provides a regenerated rubber molding device, which adopts the following technical solutions:

[0008] A regenerated rubber molding device, comprising a molding cylinder, a molding shaft rotatingly arranged in the molding cylinder, a blade, and a driving member connected to the molding shaft and used for driving the molding shaft to rotate; the molding cylinder is internally divided into a pressurizing section, a compression section and an output section in sequence along the rubber conveying direction of the molding shaft axis; the blade comprises a pressurizing spiral blade formed on the molding shaft and arranged corresponding to the pressurizing section, and an output spiral blade arranged corresponding to the position of the output section, and the spiral angle of the pressurizing spiral blade is greater than that of the output spiral blade, and an exhaust assembly for exhausting the internal gas of the rubber is arranged in the compression section.

[0009] By the technical scheme, when the reclaimed rubber is manufactured into a shape, the forming shaft is driven to rotate by the driving member, the flow speed of the reclaimed rubber in the compression section is greater than the flow speed of the reclaimed rubber in the output section due to the fact that the helix angle of the pressurizing helical blade is greater than the helix angle of the output helical blade, so that the reclaimed rubber is mainly extruded in the compression section due to the flow speed difference between the compression section and the output section, the gas contained in the reclaimed rubber is extruded, then the extruded gas is extruded through the injection channel by the output helical blade, and the extruded gas is used for secondary mixing and output of the reclaimed rubber, so that the possibility of generating bubbles in the finally output reclaimed rubber is significantly reduced; meanwhile, the position of the forming cylinder corresponding to the compression section is kept in a vacuum negative pressure state by the vacuum member during the conveying process, so that the extruded gas in the reclaimed rubber is synchronously discharged, and the effect of relieving pressure concentration and dispersion of the compression section is achieved.

[0010] Optionally, the helix angle of the pressurizing helical blade and the output helical blade gradually decreases at least at the opposite ends along the output direction of the rubber.

[0011] By the technical scheme, the pressure gradually increases at least during the process that the reclaimed rubber is conveyed in the forming cylinder, the process that the reclaimed rubber is transitioned from the compression section to the output section, so that the possibility of accumulation or degradation of the reclaimed rubber due to sudden increase of the pressure is reduced.

[0012] Optionally, the length of the helix angle gradual change section of the pressurizing helical blade and the output helical blade at least at the opposite ends is L, and L is greater than or equal to 3D, and D is the diameter of the corresponding pressurizing helical blade or output helical blade.

[0013] By the technical scheme, the purpose of compressing the reclaimed rubber in the compression section is achieved, and the reclaimed rubber can be further ensured to pass through the compression section relatively stably and gently.

[0014] Optionally, the diameter of the inner wall of the compression section of the forming cylinder is less than the diameters of the inner walls of the pressurizing section and the output section.

[0015] By the technical scheme, the forming shaft of the compression section has no blade, and the diameter of the compression section of the forming cylinder is reduced, so that the effect of compression is further achieved due to the reduction of the cross-sectional area during the transition of the reclaimed rubber, and the extruded gas can be further easily discharged due to the fact that the distance between the outer wall of the forming shaft and the inner wall of the compression section of the forming cylinder is reduced, so that the resistance of the extruded gas is reduced.

[0016] Optionally, the inner wall of the compression section of the forming cylinder is transitioned to the inner walls of the pressurizing section and the output section in a circular arc, and the diameter of the circular arc is greater than 6 mm.

[0017] By the technical scheme, the resistance of the reclaimed rubber flowing in the process of being sequentially self-pressurized in the compression section of the forming cylinder to the output section can be reduced.

[0018] Optionally, the compression section of the forming cylinder is provided with at least an exhaust port communicating with the outside, the exhaust assembly comprises an exhaust seat slidingly arranged and adapted to the exhaust port, and a gas-permeable film arranged on the exhaust seat and facing the inside of the forming cylinder, the exhaust seat is provided with an exhaust hole communicating with the outside at a position corresponding to the gas-permeable film, and the exhaust hole is communicated with a vacuum device for vacuumizing.

[0019] By the technical scheme, when the reclaimed rubber is extruded in the compression section of the forming cylinder, the vacuum device can extract the gas in the reclaimed rubber in the compression section of the forming cylinder through the exhaust hole, and the gas-permeable film can assist in limiting the extrusion of the reclaimed rubber, so as to achieve the effect of active air extraction.

[0020] Optionally, the outside of the forming cylinder is provided with a control device for controlling the movement of the exhaust seat towards or away from the inside space of the forming cylinder.

[0021] By the technical scheme, when the pressure in the compression section of the forming cylinder is too large, for example, the pressure threshold is preset by the pressure detection sensor or the control device, so that when the pressure in the compression section of the forming cylinder is too large, the control device can drive the exhaust seat to move away from the forming shaft, so as to assist in releasing the pressure, and after the pressure is released, the exhaust seat can be controlled to reset, so as to reduce the influence on the flow of the reclaimed rubber.

[0022] Optionally, the end surface of the exhaust seat facing the inside of the forming cylinder is in an arc surface structure and is adapted to the inner wall of the compression section of the forming cylinder.

[0023] By the technical scheme, the interference of the exhaust seat on the flow of the reclaimed rubber can be significantly reduced.

[0024] Optionally, the output end of the forming cylinder is an injection channel, and the middle part of the injection channel is communicated with a hydraulic extrusion device for temporarily pressurizing the rubber injection molding end.

[0025] By the technical scheme, since the reclaimed rubber can relatively quickly fill the mold cavity inside the mold, but due to the mixed source of the reclaimed rubber and the impurities that cannot be completely removed, the flowability of the reclaimed rubber is lower than that of the virgin rubber, at this time, the mold cavity in the mold is prone to insufficient filling; therefore, the middle part of the injection channel is communicated with the hydraulic extrusion device, so as to pressurize the rubber flowing in the injection channel through the hydraulic extrusion device at the end of the mold, so as to fully fill the mold and optimize the molding quality of the reclaimed rubber.

[0026] In a second aspect, the application provides a preparation method of reclaimed rubber, which adopts the following technical scheme:

[0027] A method for preparing reclaimed rubber, applying the aforementioned reclaimed rubber forming device, comprising the following steps:

[0028] The driving member drives the forming shaft to rotate, and the rubber is output through the pressurizing spiral blade and the output spiral blade, and the synchronous hydraulic extrusion member extracts and stores the rubber extruded in the injection channel to a set amount α.

[0029] After the hydraulic extrusion member stores the preset amount α of rubber, the pressurizing spiral blade and the output spiral blade inject the rubber into the mold through the injection channel for forming.

[0030] After the rubber in the mold is filled, the hydraulic extrusion member extrudes the stored rubber and pressurizes the rubber in the mold, and completes the final forming.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. When the reclaimed rubber is manufactured and formed, the driving member drives the forming shaft to rotate, and because the helix angle of the pressurizing spiral blade is greater than the helix angle of the output spiral blade, the flow speed of the reclaimed rubber in the pressurizing section is greater than the flow speed of the reclaimed rubber in the output section, so that the reclaimed rubber is mainly extruded in the compression section due to the flow speed difference between the pressurizing section and the output section, to extrude the gas contained in the reclaimed rubber, and then the gas is extruded through the injection channel by the output spiral blade, for secondary mixing and output of the reclaimed rubber, thereby significantly and effectively reducing the possibility of bubbles in the finally output reclaimed rubber.

[0033] 2. The discharge assembly is arranged in the compression section of the forming cylinder, at this time, the vacuum member extracts the gas in the extruded reclaimed rubber in the compression section of the forming cylinder through the exhaust seat in a vacuum manner, on the one hand, further reducing the possibility of gas bubbles in the reclaimed rubber, optimizing the forming quality of the reclaimed rubber; on the other hand, the process of extracting the gas can also relieve the pressure borne by the compression section of the forming cylinder, thereby relieving the pressure.

[0034] 3. Because the pressurizing spiral blade and the output spiral blade are distributed in a spaced manner, and the helix angle gradually changes, the pressure change amplitude of the reclaimed rubber when flowing between the compression section and the pressurizing section in the forming cylinder, and between the compression section and the output section, is significantly reduced, thereby reducing the possibility of material accumulation or degradation at the junctions of the compression section and the pressurizing section in the forming cylinder, and the junction of the compression section and the output section, due to shear mutation caused by excessive local pressure. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic diagram when the present embodiment is used.

[0036] Figure 2is a sectional structure schematic diagram of the embodiment.

[0037] Figure 3 is Figure 2 is an enlarged structure schematic diagram of part A in the embodiment.

[0038] Reference signs: 1, forming cylinder; 10, connecting part; 101, pressurizing section; 102, compression section; 103, output section; 11, exhaust port; 12, injection channel; 13, injection head; 2, forming shaft; 3, blade; 31, pressurizing helical blade; 32, output helical blade; 4, driving member; 41, driver; 42, shaft coupling; 5, exhaust assembly; 51, exhaust seat; 511, exhaust hole; 512, support mesh plate; 52, air permeable membrane; 53, vacuum member; 54, control member; 541, control frame body; 6, hydraulic extrusion member; 61, extrusion cylinder body; 62, hydraulic cylinder; 63, hydraulic shaft; 7, mold. DETAILED DESCRIPTION

[0039] The following will be described in detail in combination with the accompanying Figures 1-3 The application will be further described in detail.

[0040] In the production of secondary recycled rubber, unlike the production of virgin rubber, the production quality of rubber is relatively high due to the strict proportioning and perfect process of virgin rubber, and the rubber products can be used in various occasions. However, due to the recycling, the recycled rubber inevitably contains a large amount of moisture and low molecular volatile substances (such as residual softening agent), which rapidly vaporize to form a gas source in the extrusion heating stage (> 50℃); and the recycled rubber needs to be treated in the secondary production, which will increase the internal micropores when the molecular chain of the recycled rubber is broken, making it difficult for the gas to be discharged, thereby causing the production of bubbles in the current recycled rubber forming process, and the quality of the rubber products is relatively low. In the current recycled rubber forming production, the research and development personnel basically focus on the research and development of the forming process, the development of recycled rubber production additives, and the development of secondary vacuum, which not only has high research and development cost, but also significantly increases the forming cost of the recycled rubber.

[0041] In order to relatively low cost reduce the production of bubbles in the recycled rubber forming. The embodiment of the application discloses a recycled rubber forming device. Referring to Figure 1 and Figure 2The recycled rubber forming device comprises a vertically arranged forming cylinder 1, a forming shaft 2, a blade 3 and a driving member 4. The top end of the forming cylinder 1 is a ring-shaped connecting portion 10. The forming shaft 2 is coaxially arranged and rotationally connected to the connecting portion 10 at the top of the forming cylinder 1 and is sealed by a sealing ring. The lower end of the forming shaft 2 extends to the bottom of the forming cylinder 1. The bottom of the forming cylinder 1 is fixedly connected with an injection head 13. The injection head 13 is internally formed with an injection channel 12 as an output end for extruding the viscous flow state recycled rubber into a forming mold 7. The blade 3 is formed on the outer wall of the forming shaft 2 and is used to cooperate with the rotation of the forming shaft 2 to push the viscous flow state recycled rubber to flow downward.

[0042] With reference to Figure 1 and Figure 2 , the driving member 4 is arranged at the top of the forming cylinder 1 and is connected to the forming shaft 2 at the output end to drive the forming shaft 2 to rotate and drive the recycled rubber to move downward through the blade 3. The driving member 4 comprises a driver 41 and a shaft coupling 42. The driver 41 is a rotary driving component such as a motor or a hydraulic motor. The driver 41 is installed on the forming cylinder 1 and is detachably connected to the forming shaft 2 at the output end through the shaft coupling 42 to drive the forming shaft 2 to rotate. Of course, in other embodiments, the power source of the driving member 4 can also be a rotary driving component such as a rotary table. At the same time, the shaft coupling 42 can be replaced by a transmission mode such as a gear or a chain.

[0043] With reference to Figure 1 and Figure 2 , specifically, the top of the forming cylinder 1 is provided with an input port for inputting recycled rubber material, and the input port is arranged corresponding to the bottom wall of the connecting portion 10. The forming cylinder 1 is sequentially divided into a pressurizing section 101, a compression section 102 and an output section 103 from top to bottom. The blade 3 comprises pressurizing helical blades 31 and output helical blades 32 distributed from top to bottom. The pressurizing helical blades 31 surround the outer wall of the forming shaft 2 corresponding to the pressurizing section 101 and are fixed to the forming shaft 2. The output helical blades 32 surround the outer wall of the forming shaft 2 corresponding to the output section 103 and are fixed to the forming shaft 2. The cavity between the pressurizing helical blades 31 and the output helical blades 32 corresponds to the compression section 102 inside the forming cylinder 1. The helix angle of the pressurizing helical blades 31 is greater than the helix angle of the output helical blades 32. The forming cylinder 1 is provided with a discharge assembly 5 corresponding to the compression section 102. The discharge assembly 5 is used to discharge the gas in the extruded recycled rubber by vacuumizing.

[0044] In the molding of the reclaimed rubber, the driving member 4 drives the molding shaft 2 to rotate, and since the helix angle of the pressurizing helical blade 31 is greater than the helix angle of the output helical blade 32, the flow speed of the reclaimed rubber in the pressurizing section 101 is greater than the flow speed of the reclaimed rubber in the output section 103, so that the reclaimed rubber is mainly extruded in the compression section 102 due to the flow speed difference between the pressurizing section 101 and the output section 103, so as to extrude the gas contained in the reclaimed rubber, and then the gas is extruded through the injection channel 12 by the pushing of the output helical blade 32, so as to perform secondary mixing and output of the reclaimed rubber, thereby significantly effectively reducing the possibility of generating bubbles in the finally output reclaimed rubber. At the same time, the gas in the extruded reclaimed rubber is extracted by the exhaust assembly 5 through vacuumizing, which on the one hand further reduces the possibility of generating bubbles in the reclaimed rubber, optimizes the molding quality of the reclaimed rubber, and on the other hand, in the process of extracting the gas, the pressure borne by the compression section 102 of the molding cylinder 1 is also relieved, thereby achieving the effect of relieving pressure.

[0045] With reference to Figure 1 and Figure 2 Further, since the pressurizing helical blade 31 and the output helical blade 32 are distributed in a spaced manner and adopt different helix angles, the pressure of the reclaimed rubber will suddenly change when flowing between the compression section 102 and the pressurizing section 101 and between the compression section 102 and the output section 103 in the molding cylinder 1, which will cause the junctions between the compression section 102 and the pressurizing section 101 and between the compression section 102 and the output section 103 in the molding cylinder 1 to be prone to rubber accumulation or degradation due to shear mutation. In order to alleviate the above-mentioned problems, the helix angle of the pressurizing helical blade 31 and the output helical blade 32 gradually decreases along the output direction of the rubber at least at the opposite ends, so as to reduce the pressure difference at the junctions between the compression section 102 and the pressurizing section 101 and between the compression section 102 and the output section 103 in the molding cylinder 1.

[0046] With reference to Figure 1 and Figure 2 Preferably, the length of the gradually changing helix angle section of the pressurizing helical blade 31 and the output helical blade 32 at least at the opposite ends is L, and L≥3D, D is the diameter of the corresponding pressurizing helical blade 31 or output helical blade 32, so as to significantly reduce the pressure change at the junctions between the compression section 102 and the pressurizing section 101 and between the compression section 102 and the output section 103 in the molding cylinder 1. In the embodiment, the helix angle gradually decreases from the pressurizing helical blade 31 to the lower end of the output helical blade 32, so as to realize smooth pressure increase and transition of the whole conveying, and reduce the possibility of rubber accumulation or even degradation due to pressure sudden change.

[0047] Further, the diameter of the inner wall of the compression section 102 of the forming cylinder 1 is smaller than the diameter of the inner wall of the pressurizing section 101 and the output section 103, the inner wall of the compression section 102 of the forming cylinder 1 is circularly arc transitioned with the inner wall of the pressurizing section 101 and the output section 103, and the diameter of the circular arc surface between the inner wall of the compression section 102 of the forming cylinder 1 and the inner wall of the pressurizing section 101 and the output section 103 is greater than 6 mm, so as to reduce the flow resistance of the reclaimed rubber, thereby reducing the probability of rubber accumulation at the corner and unable to flow. At the same time, since the diameter of the inner wall of the compression section 102 of the forming cylinder 1 is smaller than the diameter of the inner wall of the pressurizing section 101 and the output section 103, the top of the compression section 102 will be smaller due to the smaller cross section of the passage, and since the forming shaft 2 does not occupy space at the position corresponding to the compression section 102 of the forming cylinder 1, the position corresponding to the compression section 102 of the forming cylinder 1 can better perform the compression function; and since the cross section of the flow passage of the compression section 102 to the output section 103 of the forming cylinder 1 gradually increases, in cooperation with the output spiral blade 32, the pressure rapidly increases due to the decrease of the spiral angle of the output spiral blade 32, which further reduces the possibility of accumulation or even degradation of the reclaimed rubber due to the sudden change of pressure.

[0048] With reference to Figure 2 And Figure 3 In order to discharge gas in the compression section 102 of the forming cylinder 1 while avoiding the possibility of extrusion of the reclaimed rubber, the compression section 102 of the forming cylinder 1 is provided with at least one exhaust port 11 communicating with the outside, the direction of the exhaust port 11 penetrating the cylinder wall of the forming cylinder 1 can be arbitrarily set, that is, the penetrating direction intersects the axial direction of the forming cylinder 1, in the embodiment, the exhaust port 11 penetrates the cylinder wall of the forming cylinder 1 along the radial direction of the forming cylinder 1.

[0049] With reference to Figure 2 And Figure 3, the exhaust assembly 5 comprises an exhaust seat 51 slidably connected to the exhaust port 11 and a gas permeable membrane 52 arranged on the exhaust seat 51 towards the inside of the forming cylinder 1. The exhaust seat 51 is adapted to the inner wall of the exhaust port 11, and the end face of the exhaust seat 51 in the forming cylinder 1 is arc-shaped and adapted to the inner wall of the compression section 102 of the forming cylinder 1, so as to reduce the interference with the flow of the reclaimed rubber at the position of the compression section 102 in the forming cylinder 1. At the same time, the other end of the exhaust seat 51 extends downwards outside the forming cylinder 1 and protrudes outside the forming cylinder 1, and the exhaust seat 51 is provided with an exhaust hole 511 communicating with the outside at the position corresponding to the gas permeable membrane 52, and the exhaust hole 511 is communicated with a vacuum device 53 for vacuumizing through the exhaust hole 511. The vacuum device 53 is a vacuum pump for pumping out the gas contained in the rubber at the position of the compression section 102 in the forming cylinder 1, further reducing; the gas permeable membrane 52 is used for passing gas, such as a membrane made of a microporous filter screen or a gas permeable material, such as a membrane made of polydimethylsiloxane, ePTFE polytetrafluoroethylene gas permeable membrane, etc. The product is made of materials that meet the use requirements.

[0050] Specifically, the exhaust hole 511 is provided with a support net plate 512 at the position corresponding to the side of the gas permeable membrane 52 towards the vacuum device 53, so as to support the gas permeable membrane 52, and the vacuum device 53 can be set as a switchable direction bidirectional vacuumizing pneumatic vortex pump or the like. After a certain stage of production, the vacuumizing direction of the vacuum device 53 can be switched to blow back the gas permeable membrane 52, so as to reduce the possibility that the gas permeable membrane 52 is blocked by residual rubber and cannot be vacuumized subsequently.

[0051] Referring to Figure 2 and Figure 3 At the same time, the outside of the forming cylinder 1 is fixed with a control frame body 541 corresponding to the exhaust seat 51, and the control frame body 541 is installed with a control device 54, which is a reciprocating control component, such as a hydraulic cylinder. The output shaft of the control device 54 is connected to the exhaust seat 51, so as to relieve the local pressure concentration by moving the exhaust seat 51 towards the outside of the forming cylinder 1 when the pressure of the compression section 102 of the forming cylinder 1 is too large.

[0052] Referring to Figure 2 and Figure 3 Finally, since the reclaimed rubber is conveyed and extruded by the pressurizing spiral blade 31 and the output spiral blade 32 of the spiral structure, it can relatively quickly fill the mold cavity inside the mold 7. However, due to the mixed sources of reclaimed rubber and the impurities that cannot be completely removed, the flowability of the reclaimed rubber is lower than that of the virgin rubber, at this time, the mold cavity in the mold 7 is prone to incomplete filling. Therefore, the middle part of the injection channel 12 is communicated with a hydraulic extrusion device 6, so as to pressurize the rubber flowing in the injection channel 12 by the hydraulic extrusion device 6 at the end of the mold, so as to fully fill the mold.

[0053] The hydraulic extrusion 6 includes an extrusion cylinder 61, a hydraulic cylinder 62 and a hydraulic shaft 63, the extrusion cylinder 61 is fixed to the outer wall of the forming cylinder 1 and communicated with the injection channel 12, the hydraulic cylinder 62 is installed at the end of the extrusion cylinder 61 away from the forming cylinder 1, and the output end of the hydraulic cylinder 62 is connected to the hydraulic shaft 63 for driving the hydraulic shaft 63 to slide axially. The hydraulic shaft 63 is arranged to slide axially in the extrusion cylinder 61 for the process of extruding the recycled rubber through the blade 3 before, during or after the recycled rubber is extruded into the mold 7, and the stored recycled rubber is extruded into the mold 7 through the injection channel 12 by the blade 3 through the hydraulic shaft 63 at the end of the die, on the one hand, to complete the die by end pressurization, on the other hand, without the need to accelerate the rotation of the blade 3 to realize the end pressurization.

[0054] In the embodiment of the recycled rubber forming device, when the recycled rubber is manufactured and formed, the forming shaft 2 is driven to rotate by the driving part 4. Because the helix angle of the pressurizing spiral blade 31 is greater than the helix angle of the output spiral blade 32, the flow speed of the recycled rubber in the pressurizing section 101 is greater than the flow speed of the recycled rubber in the output section 103, so that the recycled rubber is mainly extruded in the compression section 102 due to the flow speed difference between the pressurizing section 101 and the output section 103, so as to extrude the gas contained in the recycled rubber, and then the recycled rubber is extruded through the injection channel 12 by the output of the spiral blade 32, so as to realize secondary mixing and output of the recycled rubber, thereby significantly and effectively reducing the possibility of generating bubbles in the finally output recycled rubber.

[0055] At the same time, the exhaust assembly 5 is arranged in the compression section 102 of the forming cylinder 1. At this time, the gas in the recycled rubber extruded in the compression section 102 of the forming cylinder 1 is extracted in a vacuum extraction manner by the vacuum part 53 through the exhaust seat 51, on the one hand, to further reduce the possibility of generating bubbles in the recycled rubber and optimize the forming quality of the recycled rubber; on the other hand, in the process of extracting the gas, the pressure borne by the compression section 102 of the forming cylinder 1 can be relieved, thereby achieving the effect of relieving pressure.

[0056] In addition, because the pressurizing spiral blade 31 and the output spiral blade 32 are distributed in a spaced manner and adopt a gradually changing helix angle, the pressure change amplitude of the recycled rubber when flowing between the compression section 102 and the pressurizing section 101 of the forming cylinder 1 and between the compression section 102 and the output section 103 is significantly reduced, thereby reducing the possibility that the junctions between the compression section 102 and the pressurizing section 101 and between the compression section 102 and the output section 103 of the forming cylinder 1 are prone to rubber accumulation or degradation due to local excessive pressure and shear mutation.

[0057] Finally, the end of the die can be pressurized by the hydraulic extruder 6 to ensure that the reclaimed rubber fully fills the die and optimizes the molding quality of the reclaimed rubber.

[0058] The application also discloses a preparation method of the reclaimed rubber. The preparation method of the reclaimed rubber uses the reclaimed rubber molding device and comprises the following steps:

[0059] The driving member 4 drives the molding shaft 2 to rotate and outputs the rubber through the pressurizing spiral blade 31 and the output spiral blade 32. In this process, the spiral angle of the pressurizing spiral blade 31 is greater than the spiral angle of the output spiral blade 32, so that the reclaimed rubber is mainly extruded in the compression section 102 of the molding cylinder 1 due to the flow speed difference between the pressurizing section 101 and the output section 103, and the gas contained in the reclaimed rubber is relatively fully discharged through the extrusion and vacuumizing of the vacuum member 53.

[0060] The rubber extruded through the injection channel 12 by the output spiral blade 32 is used for secondary mixing and output of the reclaimed rubber. The hydraulic extruder 6 simultaneously sucks the rubber extruded from the injection channel into the extrusion cylinder 61 and stores a preset amount α. After the hydraulic extruder 6 stores the preset amount α of rubber, the rubber is simultaneously injected into the molding die through the injection channel by the pressurizing spiral blade 31 and the output spiral blade 32 for molding.

[0061] After the rubber in the die is filled, the hydraulic extruder 6 extrudes the stored rubber and pressurizes the rubber in the die, and the final molding is completed.

[0062] The above are preferred embodiments of the application, and do not limit the protection scope of the application. Therefore, any equivalent changes made on the structure, shape, distance, etc. of the application should be covered within the protection scope of the application.

Claims

1. A recycled rubber molding apparatus, characterized in that: The molding machine comprises a molding cylinder (1), a molding shaft (2) rotatably arranged in the molding cylinder (1), a blade (3), and a driving member (4) connected to the molding shaft (2) and used for driving the molding shaft (2) to rotate; The molding cylinder (1) is internally divided into a pressurizing section (101), a compression section (102) and an output section (103) along the axial direction of the molding shaft (2), and the molding shaft (2) of the compression section (102) is free of the blade (3); The blade (3) comprises pressurizing spiral blades (31) formed on the molding shaft (2) and corresponding to the pressurizing section (101) and output spiral blades (32) arranged at positions corresponding to the output section (103), and the spiral angle of the pressurizing spiral blades (31) is greater than that of the output spiral blades (32), and the compression section (102) is provided with a discharge assembly (5) for discharging internal gas of the rubber; The compression section (102) of the molding cylinder (1) is provided with at least one exhaust port (11) communicating with the outside, the discharge assembly (5) comprises an exhaust seat (51) slidably arranged and adapted to the exhaust port (11) and a gas-permeable membrane (52) arranged on the exhaust seat (51) towards the inside of the molding cylinder (1), the exhaust seat (51) is provided with an exhaust hole (511) communicating with the outside at a position corresponding to the gas-permeable membrane (52), and the exhaust hole (511) is communicated with a vacuum member (53) for vacuumizing; the outside of the molding cylinder (1) is provided with a control member (54) for controlling the movement of the exhaust seat (51) towards or away from the internal space of the molding cylinder (1); The output end of the molding cylinder (1) is an injection channel (12), and the middle part of the injection channel (12) is communicated with a hydraulic extrusion member (6) for temporarily pressurizing the end of the rubber injection molding; the hydraulic extrusion member (6) comprises an extrusion cylinder (61), a hydraulic cylinder (62) and a hydraulic shaft (63), the extrusion cylinder (61) is fixed to the outer wall of the molding cylinder (1) and communicated with the injection channel (12), the hydraulic cylinder (62) is installed on one end of the extrusion cylinder (61) away from the molding cylinder (1), and the output end of the hydraulic cylinder (62) is connected to the hydraulic shaft (63), and the hydraulic shaft (63) is axially slidably arranged in the extrusion cylinder (61); the spiral angles of the pressurizing spiral blades (31) and the output spiral blades (32) gradually decrease at least at the opposite ends along the output direction of the rubber; the end surface of the exhaust seat (51) towards the inside of the molding cylinder (1) is arc-shaped and adapted to the inner wall of the compression section (102) in the molding cylinder (1); the exhaust hole (511) is provided with a support mesh plate (512) at a position corresponding to the side of the vacuum member (53) of the gas-permeable membrane (52).

2. A device for forming reclaimed rubber according to claim 1, characterized in that: The length of the spiral angle gradual change section of at least the opposite end of the pressurizing spiral blades (31) and the output spiral blades (32) is L, and L≥3D, D is the diameter of the corresponding pressurizing spiral blade (31) or output spiral blade (32).

3. A device for forming reclaimed rubber according to any one of claims 1-2, characterized in that: The diameter of the inner wall of the compression section (102) of the molding cylinder (1) is smaller than that of the pressurizing section (101) and the output section (103).

4. A regenerative rubber forming apparatus according to claim 3, wherein: The inner wall of the compression section (102) in the forming cylinder (1) is in circular arc transition with the inner wall of the pressurizing section (101) and the output section (103), and the diameter of the circular arc is greater than 6mm.

5. A method for the production of reclaimed rubber, characterized by: The application has the steps of: The driving member (4) drives the forming shaft (2) to rotate, and the rubber is output through the pressurizing spiral blade (31) and the output spiral blade (32), and the hydraulic extruding member (6) simultaneously extracts and stores the rubber extruded in the injection channel to a set amount α; After the hydraulic extruding member (6) stores the preset rubber amount α, the pressurizing spiral blade (31) and the output spiral blade (32) inject the rubber into the forming mold (7) through the injection channel for forming; After the rubber in the mold (7) is filled, the hydraulic extruding member (6) extrudes the stored rubber and pressurizes the rubber in the mold (7), and the final forming is completed.

Images