CN110640985A

CN110640985A - Extruder of thermoplastic production usefulness

Info

Publication number: CN110640985A
Application number: CN201910929410.7A
Authority: CN
Inventors: 吴天华; 杨新星
Original assignee: Zhangjiagang Meite Polymer Material Co Ltd
Current assignee: Zhangjiagang Meite Polymer Material Co Ltd
Priority date: 2019-09-28
Filing date: 2019-09-28
Publication date: 2020-01-03

Abstract

The invention relates to the field of extruders, in particular to an extruder for producing thermoplastic plastics, which can solve the problem that the extrusion effect of the existing extruder is not ideal; and the filter screen needs to be stopped for operation when being replaced. The extrusion mechanism comprises an extrusion cylinder and an internal screw, and the screw sequentially comprises a dense chamber section, a reverse thread section, a long-pitch thread section and a dense chamber extrusion section from upstream to downstream; a discharge pipe is arranged on the right side of the extrusion section of the closed chamber, and a filter screen switching device is arranged on the discharge pipe; a feed inlet is arranged on the extruding cylinder above the dense chamber section, and a vacuumizing device is arranged on the extruding cylinder at the bottom of the long-pitch thread section; the left end part of the extruding mechanism is connected with the gearbox, the left side of the gearbox is connected with a motor shaft of the first driving motor, the first driving motor is fixed on the base, and a plurality of supporting seats matched with the extruding barrel are arranged on the base on the right side of the gearbox. The operation is simple, the use is convenient, and the device is suitable for various places.

Description

Extruder of thermoplastic production usefulness

Technical Field

The invention relates to the field of extruders, in particular to an extruder for producing thermoplastic plastics.

Background

Extruders belong to one of the classes of plastic machines, originating from the 18 th century. The extruder can divide the machine head into a right-angle machine head, an oblique-angle machine head and the like according to the material flow direction of the machine head and the included angle of the central line of the screw. The screw extruder depends on the pressure and the shearing force generated by the rotation of the screw, so that materials can be fully plasticized and uniformly mixed and are molded through a neck mold. Plastic extruders can be largely classified into twin-screw extruders, single-screw extruders, multi-screw extruders and screw-less extruders.

When thermoplastic plastics are produced, the adopted extruder is generally provided with a screw rod in a discharge cylinder, the tail end of the discharge cylinder is provided with a discharge port, the discharge port is provided with a filter screen, and devices in the plastics are removed by utilizing the filter screen. In the extruder with the structure, the thread pitch of the screw rods is generally the same, and the extrusion effect is not ideal; and the filter screen is easy to block after being used for a period of time, and the machine needs to be stopped for operation during replacement, which is troublesome.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the extruder for producing the thermoplastic plastics, which can quickly replace the filter screen, and the extruder can solve the problems that the screw pitch of the screws of the conventional extruder is generally the same pitch, and the extrusion effect is not ideal; and the filter screen is easy to block after being used for a period of time, and the machine needs to be stopped for operation when being replaced.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an extruder of thermoplastic production usefulness, includes extrusion mechanism, extrusion mechanism is including extruding the barrel and locating the inside screw rod of extruding the barrel, its characterized in that: the screw comprises a dense chamber section, a reverse threaded section, a long-pitch threaded section and a dense chamber extrusion section from upstream to downstream in sequence, wherein the thread pitch of the dense chamber section is the smallest, the thread of the reverse threaded section is opposite to that of other threads, the thread pitch of the long-pitch threaded section is the longest, and the thread pitch of the dense chamber extrusion section is smaller than that of the long-pitch threaded section; a discharge pipe is arranged on the right side of the closed chamber extrusion section, and a filter screen switching device is arranged on the discharge pipe; the extruding cylinder above the dense chamber section is provided with a feed inlet, the extruding cylinder at the bottom of the long screw thread section is communicated with the top of the suction pipe, and the bottom of the suction pipe is provided with a vacuum pumping device; the left end part of the extruding mechanism is connected with a gearbox, the left side of the gearbox is connected with a motor shaft of a first driving motor, the first driving motor is fixed on a lower machine base, and a plurality of supporting seats matched with the extruding cylinder are arranged on the machine base on the right side of the gearbox;

the filter screen switching device comprises an opening formed in the left side of the right port of the discharge pipe, a vertical round fixing ring is fixedly arranged on the discharge pipe on the left side of the opening, vertical rods are fixedly arranged on the inner side and the outer side of the fixing ring respectively, the bottom of each vertical rod is fixedly connected with the upper surface of a cross rod, the inner end of each cross rod is fixedly connected with the outer surface of the discharge pipe, a gear ring is rotatably arranged on the inner surface of the fixing ring, a plurality of gear teeth are arranged on the inner surface of the gear ring, a transverse second driving motor is fixedly arranged on the discharge pipe on the left side of the fixing ring, and a gear meshed with the gear teeth is fixedly arranged on a motor; the gear circle right flank evenly fixed be equipped with a plurality of filter assemblies, filter assembly include arc fixed plate, arc fixed plate pass through first bolt and gear circle right flank fixed connection, arc fixed plate lateral surface pass through connecting portion and the filter screen frame fixed connection of card income opening, the filter screen frame in detachable install the filter screen.

Preferably, the filter screen include circular screen frame, the screen frame in fixed be equipped with metal filter screen, the screen frame outer peripheral face equipartition have three cylindricality archs, filter screen frame internal surface be equipped with the protruding card of cylindricality put the complex draw-in groove.

Preferably, the clamping grooves respectively comprise a first sliding groove with an upper vertical opening, the bottom of the first sliding groove is communicated with a second sliding groove with a right opening, and an L-shaped clamping groove structure bent leftwards is integrally formed.

Preferably, the outer peripheral face of the gear ring is fixedly provided with a circle of groove, and the inner surface of the fixing ring is fixedly provided with a circle of boss in sliding fit with the groove.

Preferably, a reinforcing rib is fixedly arranged between the fixing ring on the inner side of the vertical rod and the cross rod.

Preferably, a fixing seat is arranged at the bottom of the second driving motor and fixedly connected with the discharge pipe through a second bolt.

Preferably, first driving motor, second driving motor and evacuating device be connected with the block terminal electricity through interconnecting link respectively, the block terminal be connected with external electric wire netting electricity.

Preferably, the whole machine base is in a transverse cuboid shape, rubber blocks are arranged at corners of the bottom of the machine base respectively, and the rubber blocks are in a flat cuboid shape respectively.

Compared with the prior art, the invention provides an extruder for producing thermoplastic plastics, which has the following beneficial effects:

1. the invention comprises a chamber section, a reverse thread section, a long-pitch thread section and a chamber extrusion section from upstream to downstream in sequence through a screw, wherein the thread pitch of the chamber section is minimum, the thread of the reverse thread section is reverse to that of other threads, the thread pitch of the long-pitch thread section is longest, and the thread pitch of the chamber extrusion section is smaller than that of the long-pitch thread section.

2. According to the invention, the discharge pipe is arranged on the right side of the closed chamber extrusion section, the discharge pipe is provided with the filter screen switching device, one filter screen frame is clamped into the notch, when the screen needs to be changed due to blockage, the driving motor can be started, the gear ring is driven to rotate through the gear, the existing filter screen frame is rotated out, and the next filter screen frame is clamped, so that the non-stop of the screen change is realized.

3. The extrusion cylinder at the bottom of the long-screw-pitch thread section is communicated with the top of the suction pipe, the bottom of the suction pipe is provided with the vacuumizing device, when the vacuum-pumping device is used, the vacuumizing device is used for sucking volatile gas in plastic, the environment is protected, and the dense-chamber extrusion section can provide enough pressure to enable the plastic to be discharged smoothly.

4. According to the invention, the filter screen comprises the circular screen frame, the metal filter screen is fixedly arranged in the screen frame, the three cylindrical protrusions are uniformly distributed on the outer peripheral surface of the screen frame, the clamping grooves matched with the cylindrical protrusions in a clamping manner are formed in the inner surface of the filter screen frame, and when the filter screen is used, the filter screen can be clamped into the clamping grooves through the cylindrical protrusions, so that the filter screen is convenient to disassemble and maintain.

5. The invention respectively comprises a first chute with a vertical upper opening through the clamping groove, the bottom of the first chute is communicated with a second chute with a right opening, and an L-shaped clamping groove structure bent leftwards is integrally formed, and when the clamping groove structure is used, the concrete operation is as follows: the cylindrical protrusions of the filter screen are clamped into the first sliding grooves respectively, clamped into the bottom and then rotated leftwards, so that the cylindrical protrusions are clamped into the second sliding grooves, the filter screen is fixed, the filter screen is rotated rightwards firstly during disassembly, and then the filter screen is pulled outwards.

6. According to the invention, the circle of groove is fixedly arranged on the outer peripheral surface of the gear ring, and the circle of boss in sliding fit with the groove is fixedly arranged on the inner surface of the fixing ring.

7. According to the invention, the reinforcing ribs are fixedly arranged between the fixing ring on the inner side of the upright rod and the cross rod, so that when the device is used, the reinforcing ribs are favorable for the firmness of connection of the fixing ring and the discharge pipe, and the working stability of the whole device is favorable.

Drawings

FIG. 1 is a schematic side view of the present invention;

FIG. 2 is an enlarged schematic view of the filter screen switching device shown in FIG. 1;

FIG. 3 is a schematic diagram of a right-view structure of the filter screen switching device in cooperation with the notch;

FIG. 4 is an enlarged schematic view of the filter assembly of FIG. 3;

FIG. 5 is a schematic cross-sectional view of the gear ring and the fixing ring;

fig. 6 is a bottom view of the upper card slot of fig. 4.

The following are marked in the figure:

1. a discharge pipe; 11. a cross bar;

2. a fixing ring; 21. erecting a rod; 22. reinforcing ribs; 23. a boss;

3. a gear ring; 31. gear teeth; 32. a groove;

4. a second drive motor; 41. a gear;

5. an arc-shaped fixing plate; 51. a first bolt; 52. a connecting portion;

6. a filter screen frame; 61. a card slot; 611. a first chute; 622. a second chute;

7. a filter screen; 71. a screen frame; 72. a metal filter screen;

8. an extrusion mechanism; 80. extruding the cylinder; 801. a feed inlet; 81. a closed cell section; 82. a reverse thread segment; a long pitch thread segment; 84. a closed-cell extrusion section; 85. a supporting seat; 86. a gearbox;

9. a first drive motor; 91. a motor shaft; 92. a motor base;

10. a machine base; 101. a vacuum pumping device; 102. a suction tube; 103. a rubber block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 6 (only one filter assembly is shown at the bottom in fig. 1 and 2 for clarity of the drawing), an extruder for producing thermoplastic plastics comprises an extruding mechanism 8, wherein the extruding mechanism 8 comprises an extruding cylinder 80 and a screw (not separately marked in the drawing) arranged inside the extruding cylinder 80, the screw sequentially comprises a dense chamber section 81, a reverse thread section 82, a long screw pitch section 83 and a dense chamber extrusion section 84 from upstream to downstream, wherein the screw pitch of the dense chamber section 81 is minimum, the thread of the reverse thread section 82 is reverse to the other threads, the screw pitch of the long screw pitch section 83 is longest, and the screw pitch of the dense chamber extrusion section 84 is smaller than that of the long screw pitch section 83. The right side of the closed chamber extrusion section 84 is provided with a discharge pipe 1, and the discharge pipe 1 is provided with a filter screen switching device. The extruding cylinder 80 above the dense chamber section 81 is provided with a feeding hole 801, the bottom of the long screw thread section 83 is communicated with the top of the suction pipe 102, and the extruding cylinder 80 at the bottom of the suction pipe 102 is provided with a vacuum pumping device 101. The left end part of the extruding mechanism 8 is connected with a gearbox 86 (the extruding cylinder 80 is fixedly connected with the shell of the gearbox 86, and a screw is connected with a speed changing component), the left side of the gearbox 86 is connected with a motor shaft 91 of a first driving motor 9, the first driving motor 9 is fixed on a machine base 10 below, and a plurality of supporting seats 85 matched with the extruding cylinder 80 are arranged on the machine base 10 on the right side of the gearbox 86.

In the above embodiment, specifically, the filter screen switching device includes an opening 12 formed in the left side of a right end opening of the discharge pipe 1, a vertical circular fixing ring 2 is fixedly disposed on the discharge pipe 1 on the left side of the opening 12, vertical rods 21 are fixedly disposed on the inner side and the outer side of the fixing ring 2, the bottom of each vertical rod 21 is fixedly connected to the upper surface of the cross rod 11, the inner end of each cross rod 11 is fixedly connected to the outer surface of the discharge pipe 1, a gear ring 3 (fig. 2) is rotatably disposed on the inner surface of the fixing ring 2, a plurality of gear teeth 31 are disposed on the inner surface of the gear ring 3, a transverse second driving motor 4 is fixedly disposed on the discharge pipe 1 on the left side of the fixing ring 2, and a gear 41 engaged with the gear teeth 31 is fixedly disposed on a motor shaft (.

In the above-mentioned embodiment, it is concrete, 3 right flank of gear circle evenly fixed be equipped with a plurality of filtering component, filtering component include arc fixed plate 5, arc fixed plate 5 through

first bolt

51 and 3 right flank fixed connection of gear circle, 5 lateral surfaces of arc fixed plate pass through connecting portion 52 and the filter screen frame 6 fixed connection of card income opening 12, filter screen frame 6 in detachable install filter screen 7.

In the above embodiment, more specifically, the filter screen 7 includes a circular screen frame 71, a metal filter screen 72 is fixedly disposed in the screen frame 71, three cylindrical protrusions (not shown) are uniformly distributed on the outer peripheral surface of the screen frame 71, and a clamping groove 61 engaged with the cylindrical protrusions is disposed on the inner surface of the filter screen frame 6.

In the above embodiment, more specifically, the locking slots 61 respectively include first sliding slots 611 that are vertically opened, and the bottoms of the first sliding slots 611 are communicated with second sliding slots 612 that are right opened, so as to form an L-shaped locking slot structure that is bent leftward.

In the above embodiment, more specifically, a circle of groove 32 is fixedly disposed on the outer peripheral surface of the gear ring 3, and a circle of boss 23 slidably engaged with the groove 32 is fixedly disposed on the inner surface of the fixing ring 2.

In the above embodiment, more specifically, a reinforcing rib 22 is further fixedly disposed between the fixing ring 2 inside the upright 21 and the cross bar 11.

In the above embodiment, more specifically, the bottom of the second driving motor 4 is provided with a fixing seat 42, and the fixing seat 42 is fixedly connected with the tapping pipe 1 through a second bolt (not marked in the figure).

In the above embodiment, more specifically, the first driving motor 9, the second driving motor 4 and the vacuum device 101 are electrically connected to a distribution box (not shown in the figure) through connecting lines, and the distribution box is electrically connected to an external power grid.

In the above embodiment, more specifically, the base 10 is a transverse rectangular parallelepiped, the rubber blocks 103 are respectively disposed at the bottom corners, and the rubber blocks 103 are respectively a flat rectangular parallelepiped (having a shock-absorbing function).

The working principle is as follows: the plastic can be stirred and melted in an accelerated way in the chamber section 81, the mixing uniformity of the plastic is improved, the resistance can be improved by the reverse threaded section 82, the time for the plastic to stay in the chamber section is prolonged, the effect is better, the plastic conveying speed can be slowed down by the long-pitch threaded section 83, and the pressure is reduced. The vacuum-pumping device 101 is used for pumping volatile gas in the plastic, which is more environment-friendly, and the closed-cell extrusion section 84 can provide enough pressure to discharge the plastic smoothly. One of them filter net rack 6 card is gone into in the opening 12, when blockking up the needs trade net, can start driving motor 4, then through gear 41 drive gear circle 3 rotations, then current filter net rack 6 rolls out, and next filter net rack 6 card is gone into to realize trading not shutting down of net. The filter screen 7 can be clamped into the clamping groove 61 through the cylindrical protrusion, so that the filter screen is convenient to disassemble and maintain. The specific operation is as follows: the cylindrical protrusions of the filter screen are respectively clamped into the first sliding groove 611, clamped into the bottom and then rotated leftwards, so that the cylindrical protrusions are clamped into the second sliding groove 612, the filter screen 7 is fixed, and the filter screen 7 is firstly rotated rightwards and then pulled outwards during disassembly. The matching of the groove 32 and the boss 23 is beneficial to the stability of the rotation of the gear ring 3 and avoids slipping from the fixed ring 2. The reinforcing rib 22 is favorable for the firmness of connecting the fixing ring 2 and the discharge pipe 1 and the working stability of the whole device.

The components used in the present invention are all common standard components or components known to those skilled in the art, and the structure and principle thereof are well known to those skilled in the art.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an extruder of thermoplastic production usefulness, includes extrusion mechanism, extrusion mechanism including extrude the barrel and locate the inside screw rod of extruding the barrel, its characterized in that: the screw comprises a dense chamber section, a reverse threaded section, a long-pitch threaded section and a dense chamber extrusion section from upstream to downstream in sequence, wherein the thread pitch of the dense chamber section is the smallest, the thread of the reverse threaded section is opposite to that of other threads, the thread pitch of the long-pitch threaded section is the longest, and the thread pitch of the dense chamber extrusion section is smaller than that of the long-pitch threaded section; a discharge pipe is arranged on the right side of the closed chamber extrusion section, and a filter screen switching device is arranged on the discharge pipe; the extruding cylinder above the dense chamber section is provided with a feed inlet, the extruding cylinder at the bottom of the long screw thread section is communicated with the top of the suction pipe, and the bottom of the suction pipe is provided with a vacuum pumping device; the left end part of the extruding mechanism is connected with a gearbox, the left side of the gearbox is connected with a motor shaft of a first driving motor, the first driving motor is fixed on a lower machine base, and a plurality of supporting seats matched with the extruding cylinder are arranged on the machine base on the right side of the gearbox;

2. The extruder of claim 1, wherein: the filter screen include circular screen frame, the screen frame in fixedly be equipped with metal filters, the screen frame outer peripheral face equipartition have three cylindricality archs, filter screen frame internal surface be equipped with cylindricality protruding card put the complex draw-in groove.

3. The extruder of claim 1, wherein: the clamping grooves respectively comprise a first sliding groove with an upper vertical opening, the bottom of the first sliding groove is communicated with a second sliding groove with a right opening, and an L-shaped clamping groove structure bent leftwards is integrally formed.

4. The extruder of claim 1, wherein: the fixed round recess that is equipped with of gear circle outer peripheral face, solid fixed ring internal surface fixed be equipped with round and recess sliding fit's boss.

5. The extruder of claim 1, wherein: and reinforcing ribs are fixedly arranged between the fixing rings on the inner sides of the vertical rods and the cross rods.

6. The extruder of claim 1, wherein: and a fixed seat is arranged at the bottom of the second driving motor and is fixedly connected with the discharge pipe through a second bolt.

7. The extruder of claim 1, wherein: first driving motor, second driving motor and evacuating device be connected with the block terminal electricity through interconnecting link respectively, the block terminal be connected with outside electric wire netting electricity.

8. The extruder of claim 1, wherein: the whole base is in a transverse cuboid shape, rubber blocks are arranged at corners of the bottom of the base respectively, and the rubber blocks are in a flat cuboid shape respectively.