Rubber mixing mill for rubber compound production

Abstract

The invention relates to the technical field of rubber production equipment, in particular to a rubber mixing mill for rubber compound production, which comprises a mixing roller, a flow guide plate, a mounting bracket, a rotary cutter group, a cutter head, a hook-shaped blade, a flow guide groove, shearing teeth, a protective cover, a limit switch, a temporary storage groove, a hydraulic push rod, a dovetail groove and a bolt hole, the flow guide plate effectively guides a large amount of rubber materials to be uniformly distributed among the mixing rollers through the V-shaped flow guide grooves formed in the inner surface, so that the materials are prevented from being accumulated on the mixing rollers, the mixing efficiency is prevented from being influenced, the materials are ensured to slide down smoothly, and uneven mixing and overlarge equipment load caused by material accumulation are avoided; and on the other hand, when the rubber material falls down from the guide plate, the rubber material can be preliminarily cut and dispersed through high-speed rotation of the hook-shaped blades circumferentially distributed on the cutter head of the rotary cutter group arranged between the guide plate and the mixing roller.

Description

Technical Field

[0001] The invention relates to the technical field of rubber production equipment, in particular to a rubber mixing machine for producing mixed rubber. Background Art

[0002] Rubber compound refers to a semi-finished product formed by uniformly mixing raw rubber with various compounding agents such as vulcanizers, accelerators, plasticizers, etc. Its purpose is to give rubber specific physical properties such as strength, elasticity, and wear resistance, as well as chemical properties such as high temperature resistance and corrosion resistance. Rubber compound is widely used in the production of rubber products such as tires, hoses, seals, soles, etc., which significantly improves the physical and chemical properties of rubber, improves the quality and added value of rubber products, and directly promotes the development of the rubber industry.

[0003] In the production process of rubber compounding, the weighted raw rubber, carbon black, vulcanizer, accelerator, plasticizer and other compounding agents must first be sent to the internal mixer for mixing and mixing evenly. The mixed rubber blank is then placed in the open mixer for mixing, accelerator, guiding and thinning to allow the various rubber molecules to fully blend, thereby enhancing the elasticity, strength and durability of the rubber. Mixing is a key step in the production of rubber compounding. Only by fully mixing various rubber materials can the internal stress between the materials be eliminated and the compatibility between the materials be improved. After the mixing is completed, the rubber compound is cut, cooled and packaged according to customer needs. Finally, the mixed rubber is placed in a cooling room for cooling before delivery.

[0004] The main structure of the open mill is two parallel rollers rotating at different speeds. During the above processing, the rubber stock is subjected to strong shearing at the roller gap, which destroys the physical entanglement of the rubber molecular chain and promotes the dispersion of the compounding agent, thereby forcing the compounding agent to be embedded in the rubber matrix to achieve rubber mixing. However, when the open mill processes a large amount of stock, a large amount of rubber accumulated above the roller gap will form a "material dam", which will prevent new rubber from entering the shear zone. The accumulation of rubber will cause the pressure distribution on the roller surface to be unbalanced, and the shear force in some areas will be insufficient, and the dispersion effect of the compounding agent will decrease; on the other hand, the temperature control of the open mill will also be affected. The accumulated rubber will hinder the heat dissipation of the roller, and the local temperature may increase by 10-15℃, resulting in an increased risk of rubber scorch, requiring frequent shutdowns to cool down or reduce the roller speed, and prolonging the mixing cycle; finally, the operation difficulty increases, the accumulated rubber is difficult to be completely turned over, and it is easy to form a "dead zone". The rubber that is not turned over in time may also cause the compounding agent to agglomerate, resulting in a decrease in the mechanical properties of the finished mixed rubber.

[0005] In view of this, in order to overcome the above technical problems, the present invention proposes a rubber mixing machine for producing mixed rubber. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, the present invention solves the technical problems thereof by adopting a technical solution as follows: a rubber mixing machine for producing mixed rubber according to the present invention comprises an open mill body, on which two horizontally arranged mixing rollers are rotatably mounted; and further comprises:

[0007] A guide plate, which is installed just above the mixing roller and is a segmented arc-shaped structure, and is connected to the main body of the mixing mill through a mounting bracket;

[0008] The rotary knife group is arranged between the mixing roller and the guide plate, and the rotary knife group comprises two knife discs rotating in opposite directions and hook-shaped blades distributed circumferentially on the knife discs.

[0009] Preferably, the guide plate is made of high carbon steel, the surface is nitrided, the hardness is ≥60HRC, and the inner surface is provided with a V-shaped guide groove.

[0010] Preferably, the guide plate includes a temporary storage tank installed at the end, the capacity of the temporary storage tank is 20% of the single feeding amount, and the rubber is temporarily stored and released through a hydraulic push rod.

[0011] Preferably, the blade disc of the rotating blade group is made of quenched and tempered steel with a hardness of HRC28-32; and the cutting edge of the hook-shaped blade is plated with TiN coating.

[0012] Preferably, the rotating knife set is driven by a variable frequency motor built into the mounting bracket, and the rotation direction of the knife disc is opposite to the rotation direction of the roller.

[0013] Preferably, a protective cover is provided on the periphery of the rotating knife group, and the material is transparent polycarbonate. When the protective cover is opened or closed, the power supply connection of the rotating knife group is controlled by a limit switch.

[0014] Preferably, a serrated shearing tooth is provided at the lower outlet of the temporary storage tank, and the shearing tooth is made of cemented carbide.

[0015] Preferably, the guide plate and the rotary knife group are both mounted on a mounting bracket, and the mounting bracket is detachably connected to the mixing mill body through a dovetail groove provided above the mixing mill body.

[0016] Preferably, bolt holes are provided on both sides of the dovetail groove of the mixing mill, and the mounting bracket is bolted to the mixing mill body through fastening bolts installed in the bolt holes.

[0017] Preferably, the surface of the mixing roller is installed with an array of pressure sensors embedded under the surface of the roller, the distance between adjacent pressure sensors is 50 mm, and the detection pressure range is 0-5 MPa.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The guide plate has a V-shaped guide groove on its inner surface, which effectively guides a large amount of rubber to be evenly distributed between the mixing rollers, thereby avoiding the accumulation of materials on the mixing rollers and affecting the mixing efficiency, ensuring the smooth sliding of the materials, and avoiding uneven mixing and excessive equipment load caused by material accumulation; on the other hand, when the rubber falls from the guide plate, the rotating knife group set between the guide plate and the mixing roller can preliminarily cut and disperse it through the high-speed rotation of the hook-shaped blades distributed circumferentially on its own knife disc.

[0020] 2. When the rubber material slides from the guide plate to the rotating knife group, the hook-shaped blade tear and shear the rubber material forcefully in a counter-rotating manner. Due to the relative movement of the knife disc and the roller, the shear force and friction force on the rubber material are increased, so that large pieces of rubber material are fully cut and dispersed before entering the mixing roller. This design greatly improves the mixing efficiency, improves the mixing uniformity, reduces the load on the roller, and prevents equipment wear and failure caused by large pieces of rubber material directly entering the roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is a three-dimensional structural cross-sectional view of the mounting bracket and related structures of the present invention;

[0024] Figure 3 is a three-dimensional structural exploded diagram of the mounting bracket and related structures of the present invention;

[0025] Figure 4 yes Figure 3 A magnified image of point A;

[0026] Figure 5 yes Figure 3 Enlarged view of point B.

[0027] In the figure: 1. main body of the mixing mill; 2. mixing roller; 3. guide plate; 4. mounting bracket; 5. rotating knife group; 6. knife disc; 7. hook-type blade; 8. guide groove; 9. shearing teeth; 10. protective cover; 11. limit switch; 12. temporary storage groove; 13. hydraulic push rod; 14. dovetail groove; 15. bolt hole; 16. fastening bolt. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention will be further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0029] like Figures 1 to 5As shown, an embodiment of the present invention provides a rubber mixing machine for producing mixed rubber, comprising an open mill body 1, on which two horizontally arranged mixing rollers 2 are rotatably mounted; and further comprising:

[0030] A guide plate 3, which is installed just above the mixing roller 2, and is a segmented arc structure, and is connected to the mixing mill body 1 through a mounting bracket 4;

[0031] The rotating knife group 5 is arranged between the mixing roller 2 and the guide plate 3. The rotating knife group 5 includes two knife discs 6 rotating in opposite directions and hook-shaped blades 7 distributed circumferentially on the knife discs 6.

[0032] As an embodiment of the present invention, the surface of the mixing roller 2 is installed with a pressure sensor array embedded under the roller surface, the distance between adjacent pressure sensors is 50mm, and the detection pressure range is 0-5Mpa.

[0033] As an embodiment of the present invention, the guide plate 3 is made of high carbon steel, the surface of which is nitrided, with a hardness of ≥60HRC, and a V-shaped guide groove 8 is provided on the inner surface.

[0034] As an embodiment of the present invention, the guide plate 3 includes a temporary storage tank 12 installed at the end. The capacity of the temporary storage tank 12 is 20% of the single feeding amount, and the rubber is temporarily stored and released through a hydraulic push rod 13.

[0035] As an embodiment of the present invention, a sawtooth shearing tooth 9 is provided at the outlet below the temporary storage tank 12, and the shearing tooth 9 is made of cemented carbide.

[0036] When there is a large amount of mixed rubber stock to be processed, the rubber stock is placed in through the segmented arc guide plate 3 installed just above the mixing roller 2. The guide plate 3 has a V-shaped guide groove 8 on its inner surface, which effectively guides a large amount of rubber stock to be evenly distributed between the mixing rollers 2, thereby avoiding the accumulation of materials on the mixing rollers 2, affecting the mixing efficiency, ensuring the smooth sliding of the materials, and avoiding uneven mixing and excessive equipment load caused by material accumulation; on the other hand, when the rubber stock falls from the guide plate 3, the rotating knife group 5 provided between the guide plate 3 and the mixing roller 2 can perform preliminary cutting and dispersion of the rubber stock through the high-speed rotation of the hook-shaped blades 7 circumferentially distributed on its own knife disc 6; the unique structure of the hook-shaped blade 7 can grab and cut large pieces of rubber stock, preventing large pieces of material from directly entering the mixing roller 2, resulting in excessive roller pressure or insufficient mixing, thereby reducing the load of the mixing roller 2 and improving the uniformity and efficiency of mixing; the mixing roller 2 The pressure sensor array embedded on the surface can monitor the pressure distribution on the roller surface in real time when processing a large amount of rubber. Once the pressure of the mixing roller 2 exceeds the set value, the system adjusts the mixing speed by adjusting the opening of the terminal temporary storage tank 12 and the rotation speed of the guide plate 3 and the rotating knife disc 6, thereby preventing equipment damage or safety accidents caused by overload, which not only ensures the safe operation of the equipment, but also ensures the stability of the mixing process and product quality; further, a serrated shearing tooth 9 is provided at the outlet below the temporary storage tank 12, which is made of cemented carbide and has high hardness and wear resistance. When the hydraulic push rod 13 pushes the rubber to be released from the temporary storage tank 12, the shearing tooth 9 can cut and disperse the rubber again to reduce the size of the material. The sheared rubber is easier to be processed by the rotating knife group 5 and the mixing roller 2, ensuring that the material can be fully and evenly mixed when a large amount of material is put in, avoiding mixing dead corners caused by excessively large material blocks;

[0037] In summary, in the working condition of processing a large amount of rubber, the present invention uses the segmented arc guide plate 3 and the V-shaped guide groove 8, so that the rubber can be evenly and smoothly guided to the mixing area, avoiding material accumulation and blockage. The setting of the rotating knife group 5 can pre-cut and disperse a large amount of rubber, thereby reducing the load of the mixing roller 2. The real-time monitoring of the embedded pressure sensor array ensures the safe operation of the equipment under high load. The combined design of the temporary storage groove 12 and the serrated shear teeth 9 enables a large amount of feed to be effectively processed in batches, thereby improving the mixing efficiency and quality. Through the synergistic effect of the above components, the present invention not only improves the production efficiency of the mixing mill, reduces energy consumption and maintenance costs, but also ensures the stability of product quality, bringing significant economic benefits to the enterprise.

[0038] As an embodiment of the present invention, the blade disc 6 of the rotating blade group 5 is made of quenched and tempered steel with a hardness of HRC28-32; the cutting edge of the hook-shaped blade 7 is plated with a TiN coating.

[0039] As an embodiment of the present invention, the rotating knife set 5 is driven by a variable frequency motor built into the mounting bracket 4, and the rotation direction of the knife disc 6 is opposite to the rotation direction of the roller.

[0040] When working, the blade disc 6 of the rotating blade set 5 is made of quenched and tempered steel with a hardness of HRC28-32. The quenched and tempered steel has excellent comprehensive mechanical properties, has sufficient hardness, and takes into account toughness, and can withstand the impact and wear generated during high-speed rotation. The selection of the blade disc 6 material ensures the stability and durability of the rotating blade set 5 when processing a large amount of rubber. At the same time, the cutting edge of the hook-shaped blade 7 adopts a titanium nitride coating. The N coating has extremely high hardness and wear resistance, low friction coefficient, and can effectively reduce the friction resistance between the hook blade 7 and the rubber material, improve cutting efficiency, and extend the service life of the hook blade 7; the frequency conversion motor built into the mounting bracket 4 can flexibly adjust the rotation speed of the cutter disc 6 according to production requirements, and achieve accurate adaptation to different rubber material types and feed amounts; when the rubber material slides from the guide plate 3 to the rotating knife group 5, the hook blade 7 tear and shear the rubber material in a reverse rotation manner. Due to the relative movement of the cutter disc 6 and the roller, the shear force and friction force on the rubber material are increased, so that large pieces of rubber material are fully cut and dispersed before entering the mixing roller 2. This design greatly improves the mixing efficiency, improves the mixing uniformity, reduces the load on the roller, and prevents equipment wear and failure caused by large pieces of rubber material directly entering the roller;

[0041] As an embodiment of the present invention, a protective cover 10 is disposed on the periphery of the rotating knife group 5 and is made of transparent polycarbonate. When the protective cover 10 is opened or closed, the power supply connection of the rotating knife group 5 is controlled by a limit switch 11.

[0042] During operation, in order to ensure operational safety, a protective cover 10 made of transparent polycarbonate material is installed on the periphery of the rotating knife group 5. Polycarbonate has high transparency and excellent impact resistance. The setting of the protective cover 10 can not only allow the operator to intuitively observe the working status of the rotating knife group 5 and discover abnormalities in time, but also effectively prevent external foreign objects from entering the high-speed rotation area to avoid potential safety hazards; when the protective cover 10 is closed, it will squeeze the limit switch 11 elastically installed on the side wall of the mounting bracket 4 to contract, thereby connecting the power supply of the rotating knife group 5. When the protective cover 10 is not closed correctly, the pop-up limit switch 11 will automatically cut off the power connection of the rotating knife group 5 to prevent the rotating knife group 5 from starting without protection, thereby protecting the safety of operators and maintenance personnel.

[0043] As an embodiment of the present invention, the guide plate 3 and the rotary knife group 5 are both mounted on a mounting bracket 4, and the mounting bracket 4 is detachably connected to the mixing mill body 1 through a dovetail groove 14 provided above the mixing mill body 1.

[0044] As an embodiment of the present invention, bolt holes 15 are further provided on both sides of the dovetail groove 14 of the mixing mill, and the mounting bracket 4 is bolted to the mixing mill body 1 via fastening bolts 16 installed in the bolt holes 15 .

[0045] During operation, the mounting bracket 4 is detachably connected to the main body 1 of the mixing mill through the dovetail groove 14 opened on the top of the mixing mill main body 1. This design makes the installation and disassembly of the guide plate 3 and the rotating knife group 5 more convenient, and is convenient for the maintenance and cleaning of the equipment. When the guide plate 3 or the rotating knife group 5 needs to be repaired, replaced or cleaned, it is only necessary to slide the mounting bracket 4 out from the top of the mixing mill main body 1 through the dovetail groove 14, without disassembling the entire equipment, thus saving time and labor costs. In addition, bolt holes 15 are also opened on both sides of the dovetail groove 14 of the mixing mill, and the mounting bracket 4 is screwed to the main body 1 of the mixing mill through the fastening bolts 16 installed in the bolt holes 15 Bolt connection, this design further enhances the connection stability between the mounting bracket 4 and the mixing mill body 1. During the operation of the equipment, a large amount of mixed rubber will generate greater vibration and impact force. The use of the fastening bolts 16 can effectively prevent the mounting bracket 4 from loosening or displacement due to force, ensuring that the guide plate 3 and the rotating knife group 5 are always in the accurate working position; through the detachable connection of the dovetail groove 14 and the fixing effect of the fastening bolts 16, the mounting bracket 4 realizes the dual functions of quick installation and stable connection. This design not only improves the maintenance efficiency of the equipment, but also ensures the safety and reliability of the equipment during high-load operation.

[0046] The above shows and describes the basic principles, main features and significant advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above specific embodiments. Without departing from the spirit and scope of the present invention, the present invention may also be modified and improved to adapt to different usage environments and customer needs. These modifications and improvements fall within the scope of protection of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A rubber mixing machine for producing mixed rubber, comprising an open mixing machine body (1), on which two horizontally arranged mixing rollers (2) are rotatably mounted; characterized in that , also includes: A guide plate (3), the guide plate (3) being installed directly above the mixing roller (2), the guide plate (3) being a segmented arc structure, and being connected to the mixing mill body (1) via a mounting bracket (4); A rotating knife group (5) is arranged between the mixing roller (2) and the guide plate (3), and the rotating knife group (5) comprises two knife discs (6) rotating in opposite directions and hook-shaped blades (7) distributed circumferentially on the knife discs (6).

2. A rubber mixing machine for producing rubber mix according to claim 1, characterized in that: The guide plate (3) is made of high carbon steel, the surface of which is nitrided and has a hardness of ≥60HRC, and the inner surface of the guide plate (3) is provided with a V-shaped guide groove (8).

3. A rubber mixing machine for producing rubber mix according to claim 1 or 2, characterized in that: The guide plate (3) comprises a temporary storage tank (12) installed at the end, the capacity of the temporary storage tank (12) is 20% of the single feeding amount, and the temporary storage and release of the rubber material are performed through a hydraulic push rod (13).

4. The rubber mixing machine for producing rubber mix according to claim 1, characterized in that: The blade disc (6) of the rotating blade assembly (5) is made of quenched and tempered steel with a hardness of HRC28-32; the cutting edge of the hook-shaped blade (7) is plated with a TiN coating.

5. A rubber mixing machine for producing mixed rubber according to claim 4, characterized in that: The rotating knife group (5) is driven by a variable frequency motor built into the mounting bracket (4), and the rotation direction of the knife disc (6) is opposite to the rotation direction of the roller.

6. A rubber mixing machine for producing mixed rubber according to claim 5, characterized in that: A protective cover (10) is provided on the periphery of the rotating knife group (5) and is made of transparent polycarbonate. When the protective cover (10) is opened or closed, the power supply connection of the rotating knife group (5) is controlled by a limit switch (11).

7. A rubber mixing machine for producing mixed rubber according to claim 3, characterized in that: A sawtooth shearing tooth (9) is provided at the outlet below the temporary storage tank (12), and the shearing tooth (9) is made of hard alloy.

8. The rubber mixing machine for producing rubber mix according to claim 1, characterized in that: The guide plate (3) and the rotating knife group (5) are both mounted on a mounting bracket (4), and the mounting bracket (4) is detachably connected to the mixing mill body (1) via a dovetail groove (14) provided above the mixing mill body (1).

9. A rubber mixing machine for producing mixed rubber according to claim 8, characterized in that: Bolt holes (15) are also provided on both sides of the dovetail groove (14) of the mixing mill, and the mounting bracket (4) is bolted to the mixing mill body (1) via fastening bolts (16) installed in the bolt holes (15).

10. The rubber mixing machine for producing rubber mix according to claim 1, characterized in that: The surface of the mixing roller (2) is provided with an array of pressure sensors embedded under the surface of the roller, the spacing between adjacent pressure sensors is 50 mm, and the detection pressure range is 0-5 MPa.

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