Rubber mixing mill double-roller working assembly integrating static elimination and constant-temperature cooling

Abstract

The invention discloses a rubber mixing mill double-roller working assembly integrating static elimination and constant-temperature cooling, and relates to the technical field of core components of mixing equipment, the rubber mixing mill double-roller working assembly comprises a front roller and a rear roller, one end of the front roller is coaxially and rotatably mounted on a left front bearing seat, and the other end of the front roller is coaxially and rotatably mounted on a right front bearing seat; one end of the rear roller is coaxially and rotatably mounted on the left rear bearing seat, and the other end of the rear roller is coaxially and rotatably mounted on the right rear bearing seat; a front roller transmission gear is coaxially fixed to a spindle at one end of the front roller, a rear roller transmission gear is coaxially fixed to a spindle at one end of the rear roller, and the front roller transmission gear and the rear roller transmission gear are meshed and matched. According to the rubber mixing mill double-roller working assembly integrating static elimination and constant-temperature cooling, all-time static export and accurate constant-temperature control of the rollers are achieved, stable operation is guaranteed through the double balance rods, transmission of the herringbone bevel gear is stable, safety is high, the failure rate is low, adaptability is high, and the service life is long.

Description

Technical Field

[0001] This invention relates to the technical field of core components of mixing equipment, and in particular to a double-roll working assembly for a rubber mixing mill that integrates static elimination and constant temperature cooling. Background Technology

[0002] Open-type rubber mixing mills are the core equipment for plasticizing and mixing high-molecular materials such as rubber and plastics. The double-roll working assembly is the core working unit of the rubber mixing mill. It applies continuous shearing and extrusion to the material through a pair of opposing rollers rotating at different speeds, thereby achieving plasticization and uniform mixing of the material. Its structural performance directly determines the precision, stability and production safety of the mixing process.

[0003] Existing twin-roller assemblies for rubber mixing mills generally suffer from the following technical defects: insufficient static electricity elimination capability: high-speed friction between polymer materials and the roller surface generates a large amount of static electricity, and the accumulation of static electricity can easily cause material scorching, aging, and even pose a safety hazard of dust explosion; existing external static electricity elimination structures have a limited elimination range, cannot achieve continuous static electricity discharge across the entire roller surface at all times, and are easily affected by vibration, resulting in poor contact and poor static electricity elimination stability; low roller temperature control accuracy: existing rollers mostly use straight-through cooling channels, with short heat exchange paths and short residence times for the coolant, resulting in low heat exchange efficiency and easily leading to excessive axial and radial temperature differences in the rollers, affecting the degree of plasticization during material mixing. Unevenness severely affects product quality stability; poor operational stability and high failure rate: the rotary joints at the roller ends rotate at high speed with the main shaft for a long time. The existing two sets of rotary joints are installed independently without a synchronous limiting structure. During equipment operation, coaxiality deviation is prone to occur, leading to rapid wear of the sealing pair, coolant leakage, and significantly increasing equipment maintenance costs and downtime. At the same time, the electrostatic slip ring has no fixed limiting structure and is prone to rotating with the main shaft, resulting in electrostatic discharge failure; insufficient transmission smoothness: the existing roller transmission mostly uses ordinary spur gears with low meshing overlap, resulting in large impact and high noise during operation. Long-term operation is prone to tooth surface wear, which cannot meet the requirements of high-speed mixing. Summary of the Invention

[0004] The purpose of this invention is to provide a double-roll working component for a rubber mixing mill that integrates static elimination and constant temperature cooling, which is highly safe, has a low failure rate, strong adaptability, and a long service life.

[0005] This invention provides a double-roll working assembly for a rubber mixing mill that integrates static elimination and constant temperature cooling. It includes a front roller and a rear roller. One end of the front roller is coaxially rotatably mounted on a left front bearing seat, and the other end is coaxially rotatably mounted on a right front bearing seat. One end of the rear roller is coaxially rotatably mounted on a left rear bearing seat, and the other end is coaxially rotatably mounted on a right rear bearing seat. A front roller drive gear is coaxially fixed to the main shaft at one end of the front roller, and a rear roller drive gear is coaxially fixed to the main shaft at one end of the rear roller. The front roller drive... The gear meshes with the rear roller drive gear; a front roller electrostatic slip ring is coaxially fitted on one end of the main shaft of the front roller, and a rear roller electrostatic slip ring is coaxially fitted on one end of the main shaft of the rear roller. An electrostatic slip ring balance bar is rigidly connected between the stator ends of the front roller electrostatic slip ring and the rear roller electrostatic slip ring. A left-hand rotary joint is sealed and connected to the end face of the main shaft of the front roller, and a right-hand rotary joint is sealed and connected to the end face of the main shaft of the rear roller. A rotary joint balance bar is rigidly connected between the stator ends of the left-hand rotary joint and the right-hand rotary joint.

[0006] Preferably, the spiral cooling channel is a double-headed spiral channel.

[0007] Preferably, buffer chambers are provided at both ends of the spiral cooling channel, and the liquid inlet and liquid return port are respectively connected to the corresponding buffer chambers. The inner diameter of the buffer chamber is larger than the inner diameter of the spiral cooling channel.

[0008] Preferably, both the front roller electrostatic slip ring and the rear roller electrostatic slip ring are precious metal brush-type conductive slip rings.

[0009] Preferably, both ends of the electrostatic slip ring balance bar are provided with waist-shaped adjustment holes. The length direction of the waist-shaped adjustment holes is parallel to the direction of the center line connecting the front roller and the rear roller. The electrostatic slip ring balance bar is detachably connected to the stator end of the corresponding electrostatic slip ring by locking bolts.

[0010] Preferably, both the left-hand rotary joint and the right-hand rotary joint are end-face sealed rotary joints.

[0011] Preferably, both the front roller drive gear and the rear roller drive gear are herringbone helical gears, and the module, number of teeth, and helix angle parameters of the front roller drive gear and the rear roller drive gear are the same, while the helix directions of the front roller drive gear and the rear roller drive gear are opposite.

[0012] Preferably, the left front bearing housing, right front bearing housing, left rear bearing housing, and right rear bearing housing are all split bearing housings.

[0013] Therefore, the present invention adopts the above-mentioned integrated electrostatic elimination and constant temperature cooling double roller working component of rubber mixing mill, which has high safety, low failure rate, strong adaptability and long service life.

[0014] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a double-roll working assembly for a rubber mixing mill that integrates static elimination and constant temperature cooling according to the present invention. Figure 2 This is a side view of a double-roll working assembly for a rubber mixing mill that integrates static elimination and constant temperature cooling, according to the present invention. Figure 3 This is a left view of a double-roll working assembly for a rubber mixing mill that integrates static elimination and constant temperature cooling, according to the present invention.

[0016] Figure Labels 1. Front roller; 2. Rear roller; 3. Left front bearing housing; 4. Right front bearing housing; 5. Left rear bearing housing; 6. Right rear bearing housing; 7. Front roller drive gear; 8. Rear roller drive gear; 9. Front roller electrostatic slip ring; 10. Rear roller electrostatic slip ring; 11. Electrostatic slip ring balance bar; 12. Left rotary joint; 13. Right rotary joint; 14. Rotary joint balance bar. Detailed Implementation

[0017] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0019] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Example 1 like Figures 1-3As shown, this invention discloses a double-roller working assembly for a rubber mixing mill that integrates static elimination and constant temperature cooling. It includes a front roller 1 and a rear roller 2 arranged in parallel. Both the front roller 1 and rear roller 2 are hollow alloy forged steel rollers with surfaces hardened by quenching, exhibiting excellent wear resistance and deformation resistance. One end of the front roller 1 is coaxially rotatably mounted on a left front bearing seat 3, and the other end is coaxially rotatably mounted on a right front bearing seat 4. One end of the rear roller 2 is coaxially rotatably mounted on a left rear bearing seat 4, and the other end is coaxially rotatably mounted on a right rear bearing seat 6. The left front bearing seat 3, right front bearing seat 4, left rear bearing seat 5, and right rear bearing seat 6 are all split bearing seats, each including a bearing seat body and a detachable bearing cap. A double-row self-aligning roller bearing is installed in the inner hole of the bearing seat body, and the inner ring of the double-row self-aligning roller bearing is interference-fitted with the main shaft of the corresponding roller.

[0021] A front roller drive gear 7 is coaxially fixed to one end of the main shaft of the front roller 1, and a rear roller drive gear 8 is coaxially fixed to one end of the main shaft of the rear roller 2. The front roller drive gear 7 and the rear roller drive gear 8 mesh with each other. Both the front roller drive gear 7 and the rear roller drive gear 8 are herringbone helical gears. The module, number of teeth, and helix angle parameters of the front roller drive gear 7 and the rear roller drive gear 8 are the same. The helix directions of the front roller drive gear 7 and the rear roller drive gear 8 are opposite. During meshing, they can cancel each other out axial forces, improve transmission smoothness, and reduce operating noise and impact. The front roller drive gear 7 and the rear roller drive gear 8 are both connected to the main shaft of the corresponding roller through a flat key. External power is input through the front roller drive gear 7, which drives the rear roller drive gear 8 to rotate synchronously in the opposite direction through gear meshing. Finally, the front roller 1 and the rear roller 2 rotate in opposite directions at different speeds to complete the material mixing operation.

[0022] A front roller electrostatic slip ring 9 is coaxially mounted on one end of the main shaft of the front roller 1, and a rear roller electrostatic slip ring 10 is coaxially mounted on one end of the main shaft of the rear roller 2. Both the front roller electrostatic slip ring 9 and the rear roller electrostatic slip ring 10 are precious metal brush-type conductive slip rings. The conductive ring at the rotor end of the front roller electrostatic slip ring 9 is interference-fitted with the main shaft of the corresponding roller, and a grounding terminal is provided at the stator end. An electrostatic slip ring balance bar 11 is rigidly connected between the stator ends of the front roller electrostatic slip ring 9 and the rear roller electrostatic slip ring 10. The rotor ends of the front roller electrostatic slip ring 9 and the rear roller electrostatic slip ring 10 are electrically connected to the main shafts of the front roller 1 and the rear roller 2, respectively. Both ends of the electrostatic slip ring balance bar 11 are provided with waist-shaped adjustment holes. The length direction of the waist-shaped adjustment holes is parallel to the direction of the center line connecting the front roller 1 and the rear roller 2. The electrostatic slip ring balance bar 11 is detachably connected to the stator end of the corresponding electrostatic slip ring by locking bolts. It can be adapted to the installation requirements of different roller center distances. At the same time, the rigid connection realizes the synchronous limit of the stator end of the two sets of electrostatic slip rings, completely avoiding the stator end from rotating with the main shaft during the operation of the equipment, and ensuring the continuity and reliability of electrostatic discharge.

[0023] The front roller 1 has a left-hand rotary joint 12 sealed to the end face of the main shaft, and the rear roller 2 has a right-hand rotary joint 13 sealed to the end face of the main shaft. Both the left-hand rotary joint 12 and the right-hand rotary joint 13 are end-face sealed rotary joints. Their moving rings are coaxially fixed to the end face of the main shaft of the corresponding rollers by a positioning pin. The stationary rings are rigidly connected to the balance bar of the rotary joints. A silicon carbide-graphite sealing pair is provided between the moving rings and the stationary rings, which has excellent wear resistance and sealing reliability and can be adapted to the circulating sealing requirements of high-pressure coolant.

[0024] A rotary joint balance bar 14 is rigidly connected between the stator ends of the left-hand rotary joint 12 and the right-hand rotary joint 13. The rotary joint balance bar 14 enables synchronous positioning of the stator ends of the two rotary joints, strictly ensuring the coaxiality of the rotary joints and the roller spindle, preventing coaxiality deviations during high-speed operation, significantly reducing wear on the sealing surfaces, and eliminating coolant leakage. Both the front roller 1 and the rear roller 2 have spiral cooling channels inside. The inlet and outlet of the spiral cooling channel extend to the end face of the corresponding roller spindle and are connected to the inlet and outlet channels of the corresponding rotary joint, respectively. The spiral cooling channel is a double-headed spiral channel, continuously arranged along the entire axial length of the corresponding roller. The inner wall of the spiral cooling channel has integrally formed turbulence protrusions, which are equidistantly arranged along the spiral direction of the channel. Both ends of the spiral cooling channel are equipped with buffer chambers. The liquid inlet and liquid outlet are connected to the corresponding buffer chambers. The inner diameter of the buffer chamber is larger than the inner diameter of the spiral cooling channel.

[0025] Both the front roller 1 and the rear roller 2 have spiral cooling channels inside, which are hidden structures inside the rollers. Figure 1 (Not shown in the image). The spiral cooling channel is a double-headed spiral channel, continuously arranged along the entire axial length of the corresponding roller, significantly increasing the heat exchange area. The inner wall of the spiral cooling channel is integrally formed with hemispherical turbulence protrusions, which are equidistantly arranged along the spiral direction of the channel. These protrusions break the laminar flow of the coolant, creating turbulence and enhancing the heat exchange effect. Cylindrical buffer cavities are provided at both ends of the spiral cooling channel. The inlet and outlet of the channel are connected to the corresponding buffer cavities. The inner diameter of the buffer cavities is larger than the inner diameter of the spiral cooling channel, preventing eddies and pressure losses when the coolant enters the channel and ensuring the stability of the cooling cycle.

[0026] The inlet and outlet of the spiral cooling channel extend axially along the main shaft of the roller to the left end face of the main shaft of the corresponding roller, and are respectively sealed and connected to the inlet and outlet channels of the left-hand rotary joint 12 and the right-hand rotary joint 13 on the corresponding side, forming a closed-loop cooling circuit. The constant-temperature coolant enters the spiral cooling channel inside the roller through the inlet channel of the rotary joint, completes the heat exchange along the entire stroke of the roller, and then flows out through the outlet channel, realizing constant temperature control of the entire roller surface.

[0027] Working Principle: During the mixing operation, external power is input through the front roller drive gear 7. The meshing of the front roller drive gear 7 and the rear roller drive gear 8 drives the front roller 1 and the rear roller 2 to rotate in opposite directions at different speeds. This applies continuous shearing and extrusion to the polymer material between the roller surfaces, completing the mixing process. During the mixing process, the static electricity generated by the friction between the material and the roller surface is transmitted through the roller body to the main shaft. Then, through the coaxially mounted front roller electrostatic slip ring 9 and rear roller electrostatic slip ring 10 at the rotor and stator ends, it is continuously discharged to the equipment grounding bus, achieving full-time, full-surface static electricity elimination of the rollers and completely avoiding safety hazards and quality problems caused by static electricity accumulation.

[0028] Meanwhile, the constant-temperature coolant enters the spiral cooling channel inside the corresponding roller through the inlet channels of the left-hand rotary joint 12 and the right-hand rotary joint 13 via an external circulation system. After completing the full-stroke heat exchange along the roller axis, it flows out through the return channel, forming a continuous closed-loop cooling cycle. This achieves precise constant-temperature control of the entire roller surface, ensuring the uniformity and stability of material mixing. During equipment operation, the electrostatic slip ring balance bar 11 and the rotary joint balance bar 14 rigidly and synchronously limit the stator ends of the two sets of electrostatic slip rings and the two sets of rotary joints, strictly ensuring their coaxiality with the roller spindle. This avoids problems such as stator rotation, coaxiality deviation, seal wear, and leakage, significantly improving the operational stability and service life of the components.

[0029] Therefore, the present invention adopts the above-mentioned integrated electrostatic elimination and constant temperature cooling double roller working component of rubber mixing mill, which realizes the static electricity discharge and precise constant temperature control of the roller at all times, the double balance bar ensures stable operation, the herringbone helical gear transmission is smooth, and it has high safety, low failure rate, strong adaptability and long service life.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A double-roll working assembly for a rubber mixing mill that integrates static elimination and constant temperature cooling, characterized in that, It includes a front roller and a rear roller. One end of the front roller is coaxially rotatably mounted on the left front bearing seat, and the other end of the front roller is coaxially rotatably mounted on the right front bearing seat. One end of the rear roller is coaxially rotatably mounted on the left rear bearing seat, and the other end of the rear roller is coaxially rotatably mounted on the right rear bearing seat. A front roller drive gear is coaxially fixed to one end of the main shaft of the front roller, and a rear roller drive gear is coaxially fixed to one end of the main shaft of the rear roller. The front roller drive gear and the rear roller drive gear mesh with each other. A front roller electrostatic slip ring is coaxially fitted to one end of the main shaft of the front roller, and a rear roller electrostatic slip ring is coaxially fitted to one end of the main shaft of the rear roller. An electrostatic slip ring balance bar is rigidly connected between the stator ends of the front roller electrostatic slip ring and the rear roller electrostatic slip ring. A left-hand rotary joint is sealed and connected to the end face of one end of the main shaft of the front roller, and a right-hand rotary joint is sealed and connected to the end face of the rear roller. A rotary joint balance bar is rigidly connected between the stator ends of the left-hand rotary joint and the right-hand rotary joint.

2. A double-roll working assembly for a rubber mixing mill integrating static elimination and constant temperature cooling according to claim 1, characterized in that, The spiral cooling channel is a double-headed spiral channel.

3. A double-roll working assembly for a rubber mixing mill integrating static elimination and constant temperature cooling according to claim 1, characterized in that, Both ends of the spiral cooling channel are equipped with buffer chambers. The liquid inlet and liquid outlet are connected to the corresponding buffer chambers. The inner diameter of the buffer chamber is larger than the inner diameter of the spiral cooling channel.

4. A double-roll working assembly for a rubber mixing mill integrating static elimination and constant temperature cooling according to claim 1, characterized in that, Both the front roller electrostatic slip ring and the rear roller electrostatic slip ring are precious metal brush-type conductive slip rings.

5. A double-roll working assembly for a rubber mixing mill integrating static elimination and constant temperature cooling according to claim 1, characterized in that, Both ends of the electrostatic slip ring balance bar are provided with waist-shaped adjustment holes. The length direction of the waist-shaped adjustment holes is parallel to the direction of the center line connecting the front roller and the rear roller. The electrostatic slip ring balance bar is detachably connected to the stator end of the corresponding electrostatic slip ring by locking bolts.

6. A double-roll working assembly for a rubber mixing mill integrating static elimination and constant temperature cooling according to claim 1, characterized in that, Both the left-hand rotary joint and the right-hand rotary joint are end-face sealed rotary joints.

7. A double-roll working assembly for a rubber mixing mill integrating static elimination and constant temperature cooling according to claim 1, characterized in that, Both the front and rear roller drive gears are herringbone helical gears. The module, number of teeth, and helix angle parameters of the front and rear roller drive gears are the same, but the helix directions of the front and rear roller drive gears are opposite.

8. A double-roll working assembly for a rubber mixing mill integrating static elimination and constant temperature cooling according to claim 1, characterized in that, The left front bearing housing, right front bearing housing, left rear bearing housing, and right rear bearing housing are all split bearing housings.

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