Magnetic noise reduction plastic extrusion device

Abstract

The application discloses a magnetic noise reduction type plastic extruding equipment and relates to the field of plastic extruding equipment.The equipment comprises an extruder provided with two extruding screws in the body, the mounting ends of the two extruding screws are detachably connected with one ends of two connecting shafts through spline sleeves respectively, the other ends of the two connecting shafts away from the extruding screws are rotationally arranged in the inner cavity of a speed reducer, a magnetic speed reducer is fixedly connected to the inner cavity wall of the speed reducer, the input end of the magnetic speed reducer penetrates the speed reducer and is connected with a driving motor, the output end of the magnetic speed reducer is fixedly connected with a driving magnetic gear, and the equipment further comprises a transmission part.The equipment has the advantages of reasonable structure, the magnetic speed reducer, the transmission part, the driving magnetic gear and two first driven magnetic gears, the working states can be switched according to the production process requirements, the same direction and opposite direction rotation of the screw can be adapted, and meanwhile, the equipment effectively avoids the problem that the traditional gear speed reducer produces large noise due to gear friction and collision.

Description

TECHNICAL FIELD

[0001] The application relates to the field of plastic extrusion equipment, in particular to a magnetic noise reduction type plastic extrusion equipment. BACKGROUND

[0002] A double-screw extruder is developed on the basis of a single-screw extruder, and has been widely applied to the forming processing of extruded products due to good feeding performance, mixing plasticizing performance, exhaust performance and extrusion stability; the basic mechanism of the extrusion process is that a screw rotates in a barrel and pushes plastics forward, and the screw structure is a slope winding on a central layer, and the purpose is to increase pressure so as to overcome greater resistance.

[0003] The existing double-screw extruder is generally composed of a driving motor, a heating cylinder with double screws and a gear reduction box with a connecting shaft, one end of the two screw ends with splines is detachably installed with the other end of the connecting shaft through a spline sleeve, so that the screw can be conveniently disassembled from the machine body for maintenance, and the double-screw extruder has the following problems in the use process.

[0004] 1. The two extrusion screws are driven by gear transmission in the reduction gear box, and noise is generated due to friction and contact between the gears during transmission, the noise exists for a long time, and the noise not only affects the environment but also harms the physical and mental health of the operators;

[0005] 2. The double-screw extruder is divided into counter-rotating double-screw extruders (that is, the two screws rotate in opposite directions, the shear is softer, the conveying capacity is strong, the pressure reduction capacity is strong, but the mixing and homogenizing capacity is not as good as that of co-rotating double-screw extruders) and co-rotating double-screw extruders (that is, the two screws rotate in the same direction, and various materials can be randomly matched, and the co-rotating double-screw extruder is good at mixing and can mix different materials uniformly and obtain the self-cleaning ability of the screw barrel, but the conveying and pressure reduction capacity is insufficient, and the extrusion pressure is unstable), and the existing extruder cannot select and switch the rotation modes of the two screws according to the production process requirements, therefore, the application provides the magnetic noise reduction type plastic extrusion equipment to meet the requirements. SUMMARY

[0006] The application aims to provide a magnetic noise reduction type plastic extrusion equipment, the application has a reasonable structure, is provided with a magnetic reducer, a transmission member, a driving magnetic gear and two first driven magnetic gears, can switch the working state according to the production process requirements, adapt to the co-rotation and counter-rotation of the screw, and the extruder effectively avoids the problem of large noise caused by the friction and collision of the traditional gear reducer.

[0007] To achieve the above object, the application provides the following technical scheme: a magnetic noise reduction type plastic extrusion equipment, which comprises an extruder provided with two extrusion screws in the body, the mounting ends of the two extrusion screws are detachably connected with one end of two connecting shafts through spline sleeves respectively, the other ends of the two connecting shafts away from the extrusion screws are rotationally arranged in the inner cavity of a reduction box, a magnetic reducer is fixedly connected on the inner cavity wall of the reduction box, the input end of the magnetic reducer penetrates through the reduction box and is fixedly connected with the output shaft of a fixedly arranged driving motor through a shaft coupling, a driving magnetic gear is fixedly connected on the output end of the magnetic reducer, two first driven magnetic gears meshed with the driving magnetic gear are fixed on the two connecting shafts, the driving magnetic gear and the first driven magnetic gear are not in contact with the clamping teeth on the first driven magnetic gear, the specifications and structures of the driving magnetic gear and the first driven magnetic gear are the same, grooves are arranged on the two inclined surfaces of each clamping tooth on the driving magnetic gear, and magnetic pieces are mounted in the grooves, the end faces of the magnetic pieces outwardly facing are of the same magnetic poles, the magnetic poles of the magnetic pieces outwardly facing of the driving magnetic gear and the first driven magnetic gear are the same, the driving magnetic gear can drive the two connecting shafts to move in the same direction, and the transmission member is used for driving the two connecting shafts to rotate in different directions and emitting low noise during work.

[0008] Preferably, the transmission member comprises two second driven magnetic gears which are the same in specification and are mounted on the two connecting shafts respectively, the second driven magnetic gears and the first driven magnetic gears are staggered, the second driven magnetic gears are the same in structure as the first driven magnetic gears, one of the second driven magnetic gears is fixedly sleeved on the circular pipe, the circular pipe is sleeved on the periphery of the connecting shaft, a sliding strip is arranged in the inner cavity of the circular pipe, the lower end of the sliding strip is slidingly arranged in the sliding groove arranged on the connecting shaft, bearings are fixedly arranged on the output end of the magnetic reducer and the outer wall of the circular pipe, the outer walls of the two bearings are fixedly connected through a connecting rod, a cylinder and a movable column are fixedly arranged on the output end of the magnetic reducer respectively, the right end of the movable column is slidingly connected with the cylinder through the sliding block arranged on the outer wall of the movable column, two first electromagnets are arranged on the end of the inner cavity of the cylinder where the movable column is located, two permanent magnets are arranged on the opposite parts of the inner cavity of the cylinder, the connecting wires of the two first electromagnets penetrate through the output shaft of the magnetic reducer and the movable column and are electrically connected with the rotating end of the conductive slip ring fixedly arranged in the inner cavity of the reduction box, the fixed end of the conductive slip ring is electrically connected with an external controller, a sliding plate is fixedly arranged on the lower end of the conductive slip ring and is slidingly arranged on the fixed block fixedly connected with the reduction box, the opposite end magnetic poles of the upper first electromagnet and the oppositely arranged permanent magnet are the same, and the opposite end magnetic poles of the lower first electromagnet and the oppositely arranged permanent magnet are opposite.

[0009] Preferably, the magnetic part is a second electromagnet, the connecting wire of the second electromagnet is arranged along the axis of the extrusion screw and connected with the rotating end of the conductive slip ring arranged oppositely and fixed in the reduction gearbox, and the fixed end of the conductive slip ring is electrically connected with the external controller.

[0010] Preferably, the outer wall of the slide and the inner wall of the circular tube are fixed with first elastic buffers, and the outer surface of the slide and the right end surface of the movable column are wrapped with second elastic buffers.

[0011] Preferably, the linear distances between the same side end surfaces of the driving magnetic gear and the two first driven magnetic gears are L2 and L3 respectively, the linear distance between the same side end surfaces of the two second driven magnetic gears is L1, L1=L2=L3, and L1 is equal to the linear distance from the first electromagnet to the permanent magnet.

[0012] Preferably, the two outer walls of the driving magnetic gear, the first driven magnetic gear and the second driven magnetic gear are provided with annular grooves, and the annular grooves are fixedly installed with damping rings.

[0013] Preferably, the inner cavity of the reduction gearbox is provided with a vacuum interlayer, and a plurality of support columns are fixedly connected in the vacuum interlayer.

[0014] Preferably, the inner wall of the reduction gearbox is fixed with a microporous sound-absorbing plate.

[0015] In summary, the technical effects and advantages of the present application are:

[0016] 1. The structure of the present application is reasonable, the magnetic reducer, the transmission part, the driving magnetic gear and the two first driven magnetic gears are arranged, the working state can be switched according to the production process requirement, the same direction and opposite direction rotation of the screw rod is adapted, meanwhile, the traditional gear reduction gearbox is effectively avoided to generate large noise due to gear friction and collision;

[0017] 2. In the present application, the linear distances between the same side end surfaces of the driving magnetic gear and the two first driven magnetic gears are L2 and L3 respectively, the linear distance between the same side end surfaces of the two second driven magnetic gears is L1, L1=L2=L3, and L1 is equal to the linear distance from the first electromagnet to the permanent magnet, so as to avoid the collision between the clutches and also avoid the front and back movement of the two connecting shafts due to the different repulsive forces, which causes the mutual friction of the spiral protrusions on the two extrusion screws meshing with each other, improves the service life of the extrusion screw and also avoids the pollution of metal impurities to the product.

[0018] 3. In this invention, the magnetic component is set as a second electromagnet, and the presence or absence of magnetism of the second electromagnet can be controlled by energizing or de-energizing it. The second electromagnet, which is not involved in the operation, can be de-energized to avoid the magnetic field it generates affecting the transmission efficiency of the component.

[0019] 4. In this invention, a first elastic buffer pad and a second elastic buffer pad are provided, both of which play a good role in buffering and reducing noise.

[0020] 5. In this invention, a damping ring is provided, which can effectively reduce vibration of the driving magnetic gear, the first driven magnetic gear, and the second driven magnetic gear, further reducing the noise generated by this gearbox.

[0021] 6. In this invention, the inner cavity of the gearbox is provided with a vacuum interlayer, and several support columns are fixedly connected inside the vacuum interlayer. The vacuum interlayer is used to block the transmission of sound and reduce noise, while the support columns play a role in enhancing the structural strength of the gearbox. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the gearbox of the present invention;

[0025] Figure 3 For the present invention Figure 2 Top view of the internal structure of the gearbox;

[0026] Figure 4 For the present invention Figure 2 Schematic diagram of the transmission component structure;

[0027] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point A in the middle;

[0028] Figure 6 For the present invention Figure 3 Schematic diagram of the cross-sectional structure of the middle cylinder;

[0029] Figure 7 For the present invention Figure 3 Schematic diagram of the left-side cross-sectional structure of the central active magnetic gear;

[0030] Figure 8 For the present inventionFigure 3 Figure 2 is a schematic view of the cross-sectional structure of the second driven magnetic gear;

[0031] Figure 9 For the invention Figure 1 Figure 3 is a right view of the cross-sectional structure of the reduction gearbox;

[0032] Figure 10 For the invention Figure 3 Figure 4 is a schematic view of the positions of the first driven magnetic gear and the second driven magnetic gear.

[0033] In the figure: 1, extruder; 2, reduction gearbox; 3, connecting shaft; 4, first driven magnetic gear; 5, magnetic speed reducer; 6, second driven magnetic gear; 7, transmission member; 71, round pipe; 72, bearing; 73, first elastic buffer pad; 74, sliding bar; 75, connecting rod; 8, driving magnetic gear; 9, conductive slip ring; 10, sliding plate; 11, fixed block; 12, cylinder; 13, permanent magnet; 14, movable column; 15, sliding block; 16, second elastic buffer pad; 17, magnetic member; 18, first electromagnet; 19, damping ring; 20, driving motor; 21, micro-hole sound-absorbing board; 22, vacuum interlayer; 23, support column. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0035] Embodiment: refer to Figures 1-3The illustrated magnetic noise reduction type plastic extrusion equipment includes an extruder 1 provided with two extrusion screws inside the body, the mounting ends of the two extrusion screws are respectively detachably connected with one end of two connecting shafts 3 through spline sleeves, the ends of the two connecting shafts 3 away from the extrusion screws are rotatably arranged in the inner cavity of a speed reducer box 2, a magnetic speed reducer 5 is fixedly connected on the inner cavity wall of the speed reducer box 2, the input end of the magnetic speed reducer 5 penetrates through the speed reducer box 2 and is fixedly connected with the output shaft of a fixedly arranged driving motor 20 through a shaft coupling, a driving magnetic gear 8 is fixedly connected on the output end of the magnetic speed reducer 5, two first driven magnetic gears 4 meshingly connected with the driving magnetic gear 8 are fixedly arranged on the two connecting shafts 3, the driving magnetic gear 8 is not in contact with the clamping teeth on the first driven magnetic gears 4, the specifications and structures of the driving magnetic gear 8 and the first driven magnetic gears 4 are the same, a groove is arranged on each clamping tooth of the driving magnetic gear 8, a magnetic piece 17 is arranged in the groove, the end faces of the plurality of magnetic pieces 17 facing the outside are of the same magnetic pole, the magnetic poles of the magnetic pieces 17 on the driving magnetic gear 8 and the first driven magnetic gears 4 facing the outside are the same, the driving magnetic gear 8 can drive the two connecting shafts 3 to move in the same direction, the device further includes a transmission member 7 for driving the two connecting shafts 3 to rotate in opposite directions and emitting low noise during work, the device adopts the non-contact magnetic speed reducer 5 to reduce the output of the driving motor 20, since the components of the magnetic speed reducer 5 are not in contact for transmission through magnetic force, the noise during speed reduction transmission is very small, the driving magnetic gear 8 is arranged on the output end of the magnetic speed reducer 5 and drives the two first driven magnetic gears 4 arranged on the two connecting shafts 3 to rotate in the same direction, the driving magnetic gear 8 and the two first driven magnetic gears 4 are repelled by the same magnetic poles, the driving magnetic gear 8 drives the two first driven magnetic gears 4 to rotate in the same direction while rotating, the clamping teeth of the driving magnetic gear 8 meshing with the two first driven magnetic gears 4 are suspended through the repelling effect of the same magnetic poles, the clamping teeth can be rubbed and collided to reduce noise, the extruder has good noise reduction effect, the transmission member 7 is further arranged for driving the two connecting shafts 3 to rotate in opposite directions and emitting low noise during work, the working state of the extruder can be adjusted to meet the needs of different product production processes.

[0036] It should be noted that, first, the speed reducer box 2 is made of magnetic isolation material, which can prevent the magnetic field formed inside from affecting external equipment or causing impurities to be adsorbed on the speed reducer box 2; second, the first driven magnetic gears 4, the driving magnetic gear 8 and the housing of the magnetic speed reducer 5 are all made of magnetic isolation material to reduce the external overflow of the magnetic field and the mutual influence between the magnetic fields.

[0037] As a preferred embodiment in the present embodiment, as Figure 4As shown, the transmission member 7 includes two second driven magnetic gear 6 respectively mounted on the two connecting shaft 3 and of the same size, the two second driven magnetic gear 6 and the two first driven magnetic gear 4 are staggered, the second driven magnetic gear 6 is the same structure with the first driven magnetic gear 4, one of the second driven magnetic gear 6 is fixedly sleeved on the circular tube 71, the circular tube 71 is sleeved on the periphery of the connecting shaft 3, the inner cavity of the circular tube 71 is provided with a slide bar 74, the lower end of the slide bar 74 is slidably arranged in the sliding groove provided on the connecting shaft 3, the output end of the magnetic gear reducer 5 and the outer wall of the circular tube 71 are fixedly provided with bearings 72, and the outer walls of the two bearings 72 are fixedly connected through a connecting rod 75, the output end of the magnetic gear reducer 5 is respectively fixedly provided with a cylinder 12 and a movable column 14, and the right end of the movable column 14 is slidably connected with the cylinder 12 through the sliding block 15 provided on the outer wall thereof, the first electromagnet 18 is arranged on the end of the inner cavity of the cylinder 12, the opposite part of the inner cavity of the cylinder 12 is provided with a permanent magnet 13, the connecting wire of the first electromagnet 18 penetrates through the movable column 14 and the output shaft of the magnetic gear reducer 5 and is electrically connected with the rotating end of the conductive slip ring 9 fixedly arranged in the inner cavity of the reduction box 2, the fixed end of the conductive slip ring 9 is electrically connected with the external controller, the lower end of the conductive slip ring 9 is fixedly provided with a sliding plate 10, and the sliding plate 10 is slidably arranged on the fixed block 11 fixedly connected with the reduction box 2, when electrified, the opposite end magnetic poles of the first electromagnet 18 and the opposite arranged permanent magnet 13 are the same, when de-energized, the first electromagnet 18 is driven to move close to the permanent magnet 13 through the magnetic force of the permanent magnet 13 and the core of the first electromagnet 18, when it is needed to work in the mode of extruding screw rotating in opposite directions, the two extruding screws (both of which are right-handed threads as seen from the threads) rotating in the same direction can be disassembled from the body, the two extruding screws (one is left-handed thread and the other is right-handed thread as seen from the threads) rotating in opposite directions are mounted together through the spline sleeve and the connecting shaft 3, after installation, the first electromagnet 18 is controlled to be de-energized, the first electromagnet 18 is driven to move close to the permanent magnet 13 through the magnetic force of the permanent magnet 13 and the core of the first electromagnet 18 and finally collides with the permanent magnet 13, at this time, the driving magnetic gear 8 is engaged with one of the first driven magnetic gear 4, one of the second driven magnetic gear 6 is engaged with the other one of the second driven magnetic gear 6 under the driving of the transmission member 7, the driving motor 20 can be controlled to work to drive the driving magnetic gear 8 to move after being decelerated by the magnetic gear reducer 5, the driving magnetic gear 8 drives the engaged one of the first driven magnetic gear 4 to rotate (driven by the principle that same magnetic poles of the magnetic members 17 repel each other), and then drives the two extruding screws to rotate in opposite directions through the engagement of the two second driven magnetic gear 6, so that the extruder can switch between multiple working modes.

[0038] It should be noted that: 1. When the movable column 14 moves under the magnetic force of the first electromagnet 18 and the permanent magnet 13, the conductive slip ring 9 electrically connected with the first electromagnet 18 will also move; 2. The cylinder 12 and the movable column 14 are both composed of magnetic isolation materials, which can avoid the magnetic force acting on the connecting shaft 3 to increase the contact stress between the connecting shaft 3 and the reduction box 2, thereby affecting the movement; 3. The second driven magnetic gear 6 is made of magnetic isolation material.

[0039] In this embodiment, as shown in Figure 7 and Figure 2 , the magnetic part 17 is provided as a second electromagnet, the connecting wire of the second electromagnet passes along the axis of the extrusion screw and is connected with the rotating end of the conductive slip ring 9 oppositely arranged and fixed in the reduction box 2, the fixed end of the conductive slip ring 9 is electrically connected with the external controller, the magnetic part 17 is provided as a second electromagnet, when the same direction movement of the extrusion screw is carried out, the two second driven magnetic gears 6 do not participate in the work, at this time, the second electromagnet provided thereon can be powered off, to avoid the magnetic part 17 of the two second driven magnetic gears 6 due to the repulsive magnetic force to cause the connecting shaft 3 and the reduction box 2 to have a larger contact stress effect, thereby hindering the rotation of the connecting shaft 3, for the same reason, when the opposite direction movement of the extrusion screw is carried out, the second electromagnet on the second driven magnetic gear 6 which does not participate in the work can be powered off, to avoid the repulsive force between the second driven magnetic gear 6 and the driving magnetic gear 8 and the other first driven magnetic gear 4, thereby avoiding affecting the transmission efficiency of each part.

[0040] It should be noted that the connecting shaft 3 provided with the transmission part 7 is provided with an opening for the movement of the connecting wire of the second electromagnet of the second driven magnetic gear 6, to facilitate the movement of the second driven magnetic gear 6 on the connecting shaft 3.

[0041] In this embodiment, as shown in Figure 5 , the outer wall of the slide bar 74 and the inner wall of the circular tube 71 are both fixed with the first elastic buffer pad 73, which has a good buffering effect, when the second driven magnetic gear 6 rotates instantaneously, the collision between the first elastic buffer pad 73 on the slide bar 74 and the inner wall of the groove on the connecting shaft 3 can be buffered, thereby reducing the collision noise, at the same time, the inner wall of the first elastic buffer pad 73 provided in the inner cavity of the circular tube 71 and the outer wall of the connecting shaft 3 can buffer the vibration of the second driven magnetic gear 6, the outer surface of the sliding block 15 and the right end surface of the movable column 14 are both wrapped with the second elastic buffer pad 16, which can buffer the collision between the movable column 14 and the cylinder 12 and the permanent magnet 13, the first elastic buffer pad 73 and the second elastic buffer pad 16 both have a good buffering and noise reduction effect.

[0042] In this embodiment, as shown in Figure 3 and Figure 10As shown, the straight-line distances between the driving magnetic gear 8 and the two first driven magnetic gears 4 on the same side are L2 and L3, respectively, and the straight-line distance between the two second driven magnetic gears 6 on the same side is L1, where L1=L2=L3. Furthermore, L1 is equal to the straight-line distance from the first electromagnet 18 to the permanent magnet 13. This distance is set in such a way that when the movable column 14 moves to the leftmost position, as... Figure 6 As shown, at this time, the two second driven magnetic gears 6 are misaligned, and half of each of the two locking teeth on the driving magnetic gear 8 is engaged with the two first driven magnetic gears 4. The two first driven magnetic gears 4 are subjected to equal repulsive forces from the driving magnetic gear 8, which is beneficial for the driving magnetic gear 8 to simultaneously drive the two connecting shafts 3 to move in the same direction. This avoids the two connecting shafts 3 from moving back and forth with large time gaps due to different repulsive forces, which would cause the spiral protrusions on the two meshing extrusion screws to rub against each other, reducing the service life of the extrusion screws. At the same time, it avoids the introduction of metal impurities generated by friction into the product. When the movable column 14 moves to the right and stops due to the magnetic force of the permanent magnet 13, one of the locking teeth on its driving magnetic gear 8... The gear is fully engaged with a first driven magnetic gear 4, and at this time, a tooth of a second driven magnetic gear 6 is fully engaged with a tooth on another second driven magnetic gear 6. The repulsive surface between the meshing teeth of the two second driven magnetic gears 6 and the repulsive surface between the driving magnetic gear 8 and the first driven magnetic gear 4 are maximized, so that the repulsive force between the two second driven magnetic gears 6 and between the driving magnetic gear 8 and the first driven magnetic gear 4 is maximized (under the condition of a constant current). This ensures that when the driving magnetic gear 8 rotates instantaneously, there is a sufficiently large repulsive force to prevent it from colliding with the tooth on the first driven magnetic gear 4 or the tooth on the two second driven magnetic gears 6.

[0043] As a preferred embodiment of this example, Figure 8 As shown, annular grooves are provided on both outer walls of the driving magnetic gear 8, the first driven magnetic gear 4, and the second driven magnetic gear 6, and damping rings 19 are fixedly installed in the annular grooves. The damping rings 19 provided on the axial direction of each gear can effectively reduce vibration of the driving magnetic gear 8, the first driven magnetic gear 4, and the second driven magnetic gear 6, and further reduce the noise generated by this gearbox 2.

[0044] As a preferred embodiment of this example, Figure 9 As shown, the inner cavity of the gearbox 2 is provided with a vacuum jacket 22, and several support columns 23 are fixedly connected inside the vacuum jacket 22. The vacuum jacket 22 is used to block the transmission of sound and reduce noise, while the support columns 23 play a role in enhancing the structural strength of the gearbox 2.

[0045] As a preferred embodiment of this example, Figure 9As shown, the inner wall of the reduction gearbox 2 is fixed with a micro-hole sound-absorbing plate 21, which can reduce the noise generated by each component during operation, such as the noise generated by airflow.

[0046] The working principle of the present application is as follows: each electrical equipment is electrically connected with the controller on the outer wall of the reduction gearbox 2, the device adopts a non-contact magnetic reducer 5 to reduce the output of the driving motor 20, since the components of the magnetic reducer 5 are not in contact for transmission through magnetic force, the noise during the speed reduction transmission is very small, and the active magnetic gear 8 is installed on the output end of the magnetic reducer 5 and cooperates with the two first driven magnetic gears 4 provided on the two connecting shafts 3 to perform the same direction rotation, the active magnetic gear 8 and the two first driven magnetic gears 4 are repelled by the same magnetic poles, the active magnetic gear 8 drives the two first driven magnetic gears 4 to rotate in the same direction at the same time, the teeth of the active magnetic gear 8 and the two first driven magnetic gears 4 are suspended, the friction and collision between the teeth can reduce the noise, the extruder has good noise reduction effect, and the transmission member 7 is also provided for driving the two connecting shafts 3 to rotate in opposite directions and emit low noise during operation, when the extrusion screw needs to work in the opposite rotation mode, the two extrusion screws (both screws are right-handed threads) rotating in the same direction are disassembled from the body, the two extrusion screws (one is left-handed thread and the other is right-handed thread) rotating in opposite directions are installed together through the spline sleeve and the connecting shaft 3, after installation, the first electromagnet 18 is controlled to be de-energized, the first electromagnet 18 is driven to move close to the permanent magnet 13 and finally collide with the permanent magnet 13 through the magnetic force of the permanent magnet 13 and the core of the first electromagnet 18, at this time, the active magnetic gear 8 is engaged with one of the first driven magnetic gears 4, and the second driven magnetic gear 6 is engaged with the other second driven magnetic gear 6 under the drive of the transmission member 7, the driving motor 20 can be controlled to work and drive the active magnetic gear 8 to move after speed reduction through the magnetic reducer 5, the active magnetic gear 8 drives the engaged first driven magnetic gear 4 to rotate (driven by the same magnetic pole repulsion principle of the magnetic member 17), and then drives the two extrusion screws to rotate in opposite directions through the engagement of the two second driven magnetic gears 6, so that the extruder can switch between multiple working modes.

[0047] Finally, it should be noted that: the above description is only a preferred embodiment of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or replace some technical features with equivalent ones, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A magnetic noise-reducing plastic extrusion device, comprising an extruder (1) with two extrusion screws installed inside the machine body, wherein the mounting ends of the two extrusion screws are detachably connected to one end of two connecting shafts (3) respectively via spline sleeves, and the ends of the two connecting shafts (3) away from the extrusion screws are rotatably disposed in the inner cavity of a reduction gearbox (2), characterized in that: A magnetic reducer (5) is fixedly connected to the inner wall of the reduction gearbox (2), and the input end of the magnetic reducer (5) passes through the reduction gearbox (2) and is fixedly connected to the output shaft of the fixedly installed drive motor (20) through a coupling. A driving magnetic gear (8) is fixedly connected to the output end of the magnetic reducer (5). Two first driven magnetic gears (4) that mesh with the driving magnetic gear (8) are fixed on both connecting shafts (3). The driving magnetic gear (8) does not contact the teeth on the first driven magnetic gear (4). The driving magnetic gear (8) and the first driven magnetic gear (4) are connected to each other. The driven magnetic gear (4) has the same specifications and structure. Each tooth of the driving magnetic gear (8) has a groove on both inclined surfaces, and a magnetic element (17) is installed in each groove. The magnetic elements (17) have the same magnetic pole on their outer-facing end faces. The magnetic poles of the magnetic elements (17) on the first driven magnetic gear (4) and the driving magnetic gear (8) are the same. The driving magnetic gear (8) can drive the two connecting shafts (3) to move in the same direction. It also includes a transmission element (7) for driving the two connecting shafts (3) to rotate in opposite directions and emitting low noise when working. The inner cavity of the gearbox (2) is provided with a vacuum jacket (22), and a number of support columns (23) are fixedly connected inside the vacuum jacket (22). Microporous sound-absorbing plates (21) are fixed on the inner wall of the gearbox (2).

2. The magnetic noise reduction plastic extrusion equipment according to claim 1, characterized in that: The transmission component (7) includes two second driven magnetic gears (6) of the same specification, respectively mounted on the two connecting shafts (3). The two second driven magnetic gears (6) and the two first driven magnetic gears (4) are staggered. The second driven magnetic gears (6) have the same structure as the first driven magnetic gears (4). One of the second driven magnetic gears (6) is fixedly sleeved on a round tube (71). The round tube (71) is sleeved on the periphery of the connecting shaft (3). (71) has a slide bar (74) in its inner cavity. The lower end of the slide bar (74) is slidably disposed in a groove provided on the connecting shaft (3). Bearings (72) are fixed on the output end of the magnetic reducer (5) and the outer wall of the round tube (71). The outer walls of the two bearings (72) are fixedly connected by a connecting rod (75). A cylinder (12) and a movable column (14) are fixed on the output end of the magnetic reducer (5). The right end of the movable column (14) is connected through its outer wall. A slider (15) is provided on the upper part and slidably connected to the cylinder (12). A first electromagnet (18) is provided on the end of the movable column (14) located in the inner cavity of the cylinder (12). A permanent magnet (13) is provided on the opposite part of the inner cavity of the cylinder (12). The connecting wire of the first electromagnet (18) passes through the movable column (14) and the output shaft of the magnetic reducer (5) and is electrically connected to the rotating end of the conductive slip ring (9) fixed in the inner cavity of the reducer (2). The fixed end of the conductive slip ring (9) is electrically connected to the external controller. The lower end of the conductive slip ring (9) is fixed with a sliding plate (10), and the sliding plate (10) is slidably mounted on the fixed block (11) which is fixedly connected to the gearbox (2). When energized, the magnetic poles of the first electromagnet (18) and the oppositely mounted permanent magnet (13) are the same. When de-energized, the first electromagnet (18) is driven to move closer by the magnetic force of the iron core of the permanent magnet (13).

3. A magnetic noise-reducing plastic extrusion device according to claim 1 or 2, characterized in that: The magnetic component (17) is configured as a second electromagnet. The connecting wire of the second electromagnet passes through the axis of the connecting shaft (3) and is connected to the rotating end of the conductive slip ring (9) which is oppositely arranged and fixedly arranged inside the gearbox (2). The fixed end of the conductive slip ring (9) is electrically connected to the external controller.

4. The magnetic noise reduction plastic extrusion equipment according to claim 2, characterized in that: The outer wall of the slider (74) and the inner wall of the round tube (71) are both fixed with a first elastic buffer pad (73), and the outer surface of the slider (15) and the right end face of the movable column (14) are both covered with a second elastic buffer pad (16).

5. A magnetic noise-reducing plastic extrusion device according to claim 2, characterized in that: The straight distances between the active magnetic gear (8) and the two first driven magnetic gears (4) on the same side are L2 and L3, respectively, and the straight distance between the two second driven magnetic gears (6) on the same side is L1. L1 = L2 = L3, and L1 is equal to the straight distance from the first electromagnet (18) to the permanent magnet (13).

6. A magnetic noise-reducing plastic extrusion device according to claim 1 or 2, characterized in that: The active magnetic gear (8), the first driven magnetic gear (4), and the second driven magnetic gear (6) are all provided with annular grooves on their outer walls, and a damping ring (19) is fixedly installed in the annular groove.

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