Double-screw extruder

Abstract

The utility model provides a twin-screw extruder which comprises a base, an extruder box body and a motor are arranged on the base, an extrusion mechanism is arranged in the extruder box body, the output end of the motor is connected with the extrusion mechanism, a material distribution box and a feeding hopper are arranged on the upper portion of the extruder box body, and the feeding hopper is connected with the output end of the motor. A material vibrating device and a screen are arranged in the material distributing box, the material vibrating device comprises a synchronous wheel, a synchronous belt and a rotating shaft, and the rotating shaft extends out of the material distributing box and is rotationally connected with the left side of the extrusion mechanism through the synchronous wheel and the synchronous belt. According to the double-screw extruder provided by the utility model, after the motor is started, raw materials are poured from the feeding hopper and then enter the material distributing box, and at the moment, the motor drives the extruding mechanism to operate and drives the material vibrating device to operate through the synchronous wheel and the synchronous belt, so that the raw materials accumulated on the screen mesh are vibrated to be scattered; and the influence on the quality of an extruded finished product due to non-uniform melting caused by caking of the raw materials during extrusion molding is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, in particular to a twin-screw extruder. Background Art

[0002] Twin-screw extruders are developed on the basis of single-screw extruders. Due to their good feeding performance, mixing and plasticizing performance, exhaust performance, extrusion stability and other characteristics, they are now widely used in the molding of extruded products. The basic mechanism of the extrusion process is simply that a screw rotates in the barrel and pushes the plastic forward. Polyethylene (PE) and polypropylene (PP) are both common thermoplastic polymers, and they have a wide range of uses in industrial production.

[0003] In the prior art, when raw material particles of polyethylene and polypropylene are added to a spiral conveyor mechanism, the valve of the material box is often directly opened to allow the raw material particles to be directly discharged from the discharge port of the material box into the spiral conveyor mechanism. However, in this process, since a large number of raw material particles are accumulated in the material box, agglomeration is easily generated, and when discharging, the particles at the bottom are discharged first. Therefore, some agglomerated particles are discharged into the spiral conveyor mechanism. The agglomerated particles are heated and melted together with the scattered particles, which often results in uneven density of the liquid, thereby reducing the quality of the finished product.

[0004] Therefore, it is necessary to provide a twin-screw extruder to solve the above-mentioned technical problems. Utility Model Content

[0005] The utility model provides a twin-screw extruder, which solves the problem that when some agglomerated particles and scattered particles are heated and melted together, the density of the liquid material is often uneven, thereby reducing the quality of the finished product.

[0006] In order to solve the above technical problems, the twin-screw extruder provided by the utility model includes: a base, on which an extruder case and a motor are arranged, an extrusion mechanism is arranged inside the extruder case, the output end of the motor is connected to the extrusion mechanism, a distribution box and a feed hopper are arranged on the upper part of the extruder case, a vibrating device and a screen are arranged inside the distribution box, the vibrating device includes a synchronous wheel, a synchronous belt and a rotating shaft, and the rotating shaft extends to the outside of the distribution box and is rotatably connected to the left side of the extrusion mechanism through the synchronous wheel and the synchronous belt.

[0007] Preferably, the output end of the extruder housing is provided with a discharge port, and heating devices are fixedly connected to both sides of the extruder housing.

[0008] Preferably, the extrusion mechanism includes a driving shaft, a driven shaft and a stirring blade, the driving shaft and the driven shaft are both rotatably connected to the extruder housing and extend to the outside of the extruder housing, the driving shaft is connected to the output end of the motor, a first gear is fixedly connected to the driving shaft, a second gear is fixedly connected to the driven shaft, the first gear is meshed with the second gear, and the stirring blade is fixedly connected to the driving shaft and the driven shaft.

[0009] Preferably, the feed hopper includes a polyethylene feed hopper and a polypropylene feed hopper, and the feed hopper is fixedly connected to the upper part of the distribution box and communicated with the interior of the distribution box.

[0010] Preferably, the material distribution box comprises a material distribution box body, an inspection port is provided on a side of the material distribution box body, and an inspection door is provided at the inspection port.

[0011] Preferably, the material vibrating device further comprises a vibrating rod group, the vibrating rod group is sleeved on the rotating shaft, the vibrating rod group is fixedly connected to the rotating shaft, and a connecting rod is fixedly connected to the vibrating rod group.

[0012] Preferably, the screen includes a mounting bar and a sleeve rod, the mounting bar is fixedly connected to a mesh plate, a groove is provided on the main body of the distribution box at a position corresponding to the mounting bar, the sleeve rod is fixedly connected to the inside of the groove, the mounting bar is slidably connected to the sleeve rod, a spring is sleeved on the sleeve rod, the spring is fixedly connected to the groove, and the other end of the spring is fixedly connected to the mounting bar.

[0013] Compared with the related art, the twin-screw extruder provided by the utility model has the following beneficial effects:

[0014] The utility model provides a twin-screw extruder. After the motor is started, the raw materials are poured from the feed hopper and then enter the material distribution box. At this time, the motor drives the extrusion mechanism to operate, and also drives the vibration device to operate through the synchronous wheel and the synchronous belt, so as to vibrate and disperse the raw materials accumulated on the screen, so as to prevent the raw materials from being agglomerated and causing uneven melting during extrusion molding, thereby affecting the quality of the extruded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of a preferred embodiment of a twin-screw extruder provided by the utility model;

[0016] Figure 2 It is a structural schematic diagram of the extrusion mechanism in the utility model;

[0017] Figure 3 This is a schematic diagram of the structure inside the material distribution box of the utility model;

[0018] Figure 4 It is a schematic diagram of the structure of the screen in the utility model.

[0019] Numbers in the figure: 1. base, 2. extruder casing, 3. motor, 4. extrusion mechanism, 41. driving shaft, 42. driven shaft, 43. first gear, 44. second gear, 45. stirring blade, 5. discharge port, 6. heating device, 7. feed hopper, 71. polyethylene feed hopper, 72. polypropylene feed hopper, 8. distribution box, 81. distribution box body, 82. inspection door, 9. vibration device, 91. synchronous wheel, 92. synchronous belt, 93. rotating shaft, 94. vibration rod group, 95. connecting rod, 10. screen, 101. mounting strip, 102. mesh plate, 103. sleeve rod, 104. spring. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0021] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 ,in, Figure 1 A schematic structural diagram of a preferred embodiment of a twin-screw extruder provided by the utility model; Figure 2 It is a structural schematic diagram of the extrusion mechanism in the utility model; Figure 3 This is a schematic diagram of the structure inside the material distribution box of the utility model; Figure 4 It is a schematic diagram of the structure of the screen in the utility model.

[0022] The twin-screw extruder includes: a base 1, on which an extruder case 2 and a motor 3 are arranged, an extruder mechanism 4 is arranged inside the extruder case 2, the output end of the motor 3 is connected to the extrusion mechanism 4, a distribution box 8 and a feed hopper 7 are arranged on the upper part of the extruder case 2, a vibrating device 9 and a screen 10 are arranged inside the distribution box 8, the vibrating device 9 includes a synchronous wheel 91, a synchronous belt 92 and a rotating shaft 93, the rotating shaft 93 extends to the outside of the distribution box 8 and is rotatably connected to the left side of the extrusion mechanism 4 through the synchronous wheel 91 and the synchronous belt 92.

[0023] Start the motor 3 to drive the extrusion mechanism 4 to operate, and then add the granular polyethylene and polypropylene raw materials into the distribution box 8 through the feed hopper 7. Since the rotating shaft 93 extends to the outside of the distribution box 8 and is rotationally connected to the left side of the extrusion mechanism 4 through the synchronous wheel 91 and the synchronous belt 92, the vibration device 9 also operates synchronously at this time, continuously vibrating the raw materials accumulated on the screen 10, and the raw materials then pass through the screen 10 and fall into the extruder box 2 below, and are then extruded and formed by the extrusion mechanism 4.

[0024] The output end of the extruder housing 2 is provided with a discharge port 5 , and both sides of the extruder housing 2 are fixedly connected with heating devices 6 .

[0025] The heating device 6 heats the raw materials inside the extruder housing 2 to melt them, and the finished product is extruded from the discharge port 5 .

[0026] The extrusion mechanism 4 includes a driving shaft 41, a driven shaft 42 and a stirring blade 45. The driving shaft 41 and the driven shaft 42 are both rotatably connected to the extruder housing 2 and extend to the outside of the extruder housing 2. The driving shaft 41 is connected to the output end of the motor 3. A first gear 43 is fixedly connected to the driving shaft 41, and a second gear 44 is fixedly connected to the driven shaft 42. The first gear 43 is meshed with the second gear 44. The stirring blade 45 is fixedly connected to the driving shaft 41 and the driven shaft 42.

[0027] The motor 3 is started, driving the driving shaft 41 and the first gear 43 to rotate. Since the first gear 43 is meshed with the second gear 44 , the driven shaft 42 is also driven to rotate, so that the stirring blades 45 stir the raw materials inside the extruder housing 2 .

[0028] The feed hopper 7 includes a polyethylene feed hopper 71 and a polypropylene feed hopper 72 . The feed hopper 7 is fixedly connected to the upper portion of the distribution box 8 and communicated with the interior of the distribution box 8 .

[0029] The polyethylene and polypropylene raw material particles enter the inside of the distribution box 8 from the polyethylene feed hopper 71 and the polypropylene feed hopper 72 respectively.

[0030] The material distribution box 8 comprises a material distribution box body 81 , a side of the material distribution box body 81 is provided with an inspection port, and an inspection door 82 is provided at the inspection port.

[0031] An inspection door 82 is provided to facilitate inspection of the vibrating device 9 and the screen 10 inside the material distribution box body 81 to prevent malfunctions after long-term operation.

[0032] The material vibrating device 9 further comprises a vibrating rod group 94 , which is sleeved on the rotating shaft 93 , and the vibrating rod group 94 is fixedly connected to the rotating shaft 93 , and a connecting rod 95 is fixedly connected to the vibrating rod group 94 .

[0033] When the rotating shaft 93 rotates, the vibration rod group 94 rotates accordingly, continuously vibrating the screen 10 from below, and the connecting rod 95 increases the strength of the vibration rod group 94 and makes the vibration more uniform.

[0034] The screen 10 includes a mounting strip 101 and a sleeve rod 103, the mounting strip 101 is fixedly connected to a mesh plate 102, a groove is provided on the distribution box body 81 at a position corresponding to the mounting strip 101, the sleeve rod 103 is fixedly connected to the inside of the groove, the mounting strip 101 is slidably connected to the sleeve rod 103, a spring 104 is sleeved on the sleeve rod 103, the spring 104 is fixedly connected to the groove, and the other end of the spring 104 is fixedly connected to the mounting strip 101.

[0035] The vibrating device 9 continuously vibrates the bottom of the mesh plate 102, so that the raw materials accumulated on the mesh plate 102 fall from the mesh into the extruder box 2 below; at the same time, the mounting strip 101 fixedly connected to the mesh plate 102 vibrates up and down along the sleeve rod 103, and then resets under the action of the spring 104.

[0036] The working principle of the twin-screw extruder provided by the utility model is as follows:

[0037] Start the motor 3 to drive the extrusion mechanism 4 to operate, and then add the granular polyethylene and polypropylene raw materials into the distribution box 8 through the feed hopper 7. Since the rotating shaft 93 extends to the outside of the distribution box 8 and is rotationally connected to the left side of the extrusion mechanism 4 through the synchronous wheel 91 and the synchronous belt 92, the vibration device 9 also operates synchronously at this time, continuously vibrating the raw materials accumulated on the screen 10, and the raw materials then pass through the screen 10 and fall into the extruder box 2 below, and are then extruded and formed by the extrusion mechanism 4.

[0038] Compared with the related art, the twin-screw extruder provided by the utility model has the following beneficial effects:

[0039] After starting the motor 3, the raw materials are poured from the feed hopper 7 into the distribution box 8. At this time, the motor 3 drives the extrusion mechanism 4 to operate, and also drives the vibration device 9 to operate through the synchronous wheel 91 and the synchronous belt 92, so as to disperse the raw materials accumulated on the screen 10, so as to prevent the raw materials from agglomerating during extrusion molding and causing uneven melting, thereby affecting the quality of the extruded product.

[0040] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. Twin-screw extruder, characterized in that, include: A base is provided with an extruder case and a motor, an extrusion mechanism is provided inside the extruder case, an output end of the motor is connected to the extrusion mechanism, a material distribution box and a feed hopper are provided on the upper part of the extruder case, a material vibration device and a screen are provided inside the material distribution box, the material vibration device includes a synchronous wheel, a synchronous belt and a rotating shaft, the rotating shaft extends to the outside of the material distribution box and is rotatably connected to the left side of the extrusion mechanism through the synchronous wheel and the synchronous belt.

2. The twin-screw extruder according to claim 1, characterized in that The output end of the extruder housing is provided with a material outlet, and heating devices are fixedly connected to both sides of the extruder housing.

3. The twin-screw extruder according to claim 1, characterized in that The extrusion mechanism includes a driving shaft, a driven shaft and a stirring blade, the driving shaft and the driven shaft are both rotatably connected to the extruder housing and extend to the outside of the extruder housing, the driving shaft is connected to the output end of the motor, the driving shaft is fixedly connected to a first gear, the driven shaft is fixedly connected to a second gear, the first gear is meshed with the second gear, and the stirring blade is fixedly connected to the driving shaft and the driven shaft.

4. The twin-screw extruder according to claim 1, characterized in that The feed hopper comprises a polyethylene feed hopper and a polypropylene feed hopper, and the feed hopper is fixedly connected to the upper part of the distribution box and communicated with the inside of the distribution box.

5. The twin-screw extruder according to claim 1, characterized in that The material distribution box comprises a material distribution box body, a side of the material distribution box body is provided with an inspection port, and an inspection door is arranged at the inspection port.

6. The twin-screw extruder according to claim 1, characterized in that The material vibrating device also includes a vibrating rod group, which is sleeved on the rotating shaft, the vibrating rod group is fixedly connected to the rotating shaft, and a connecting rod is fixedly connected to the vibrating rod group.

7. The twin-screw extruder according to claim 1, characterized in that The screen includes a mounting bar and a sleeve rod, the mounting bar is fixedly connected to a mesh plate, a groove is provided on the main body of the material distribution box at a position corresponding to the mounting bar, the sleeve rod is fixedly connected to the inside of the groove, the mounting bar is slidably connected to the sleeve rod, a spring is sleeved on the sleeve rod, the spring is fixedly connected to the groove, and the other end of the spring is fixedly connected to the mounting bar.

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