PVC processing twin screw machine

Abstract

This utility model relates to the technical field of material mixing devices, specifically a twin-screw extruder for PVC processing. It includes a base, a cylinder on the base, a feed inlet on the cylinder, grooves on both inner walls of the feed inlet, and blocking components within the grooves. Two screws are housed within the inner cavity of the cylinder. A first gear is mounted on one side of each screw, and a second gear meshes between the two first gears. A rotating column is mounted on the second gear, a speed-regulating motor is mounted on one side of the rotating column, an auxiliary measuring metal block is mounted on the rotating column, and a speed measuring instrument is mounted directly above the rotating column. A control panel is mounted on one side of the cylinder. This allows the feed area of ​​the feed inlet to be dynamically adjusted according to the screw speed, optimizing feeding efficiency, avoiding starvation during high-speed feeding or material accumulation during low-speed feeding, thereby increasing output and stabilizing the plasticizing process.

Description

Technical Field

[0001] This utility model relates to the field of material mixing device technology, and more specifically, to a twin-screw extruder for PVC processing. Background Technology

[0002] Polyvinyl chloride (PVC) is a thermoplastic with excellent comprehensive properties. It is polymerized from vinyl chloride monomer and has flame retardancy, chemical corrosion resistance and electrical insulation. By adding plasticizers, stabilizers and other additives, its softness and hardness and properties can be adjusted. It is widely used in building materials (pipes, profiles), packaging (films, bottles), wires and cables, medical devices and other fields. In the PVC production process, a twin-screw extruder is required to process the raw materials.

[0003] For example, Chinese patent disclosure: A multi-unit combined twin-screw extruder, application number: CN202321160795.3, includes: a twin-screw extruder; the twin-screw extruder includes: a barrel, a screw shaft and a bearing support structure; the screw shaft is disposed in the barrel; the bearing support structure is connected to the tail end of the screw shaft and is used to provide support for the tail end of the screw shaft; the length-to-diameter ratio of the screw shaft is ≤36:1; the barrel is provided with a feed port and a discharge port; the twin-screw extruder includes n units, and n≥2; the (n-1)th twin-screw extruder is disposed above the nth twin-screw extruder, and the discharge port of the barrel of the (n-1)th twin-screw extruder overlaps with the feed port of the barrel of the nth twin-screw extruder. The bearing support structure provided in this solution can provide support for the tail end of the screw shaft. With the multiple twin-screw extruders overlapping each other, the requirement for thorough mixing of materials can be met while avoiding friction between the screw shaft and the barrel.

[0004] However, in the above-mentioned technical solutions, in the existing twin-screw extruder technology for PVC processing, when processing different formulations (such as switching between rigid and flexible PVC) or raw material forms (powder / granules / recycled materials), the screw speed needs to be adjusted. At present, the feed inlet of twin screw extruders is usually designed with a fixed size, which is difficult to adapt to the feeding needs under different speed conditions. When the screw speed is high, the material cannot fill the feed inlet in time, which can easily lead to starvation feeding, thereby affecting the output and product quality of the extruder. When the screw speed is low, the feed amount at the feed inlet is too large, which can easily cause material accumulation, affecting the material conveying and plasticizing effect. Utility Model Content

[0005] The main objective of this invention is to provide a twin-screw extruder for PVC processing, which effectively solves the problem in the prior art where adjusting the screw speed is required when processing different formulations (such as switching between rigid and flexible PVC) or raw material forms (powder / granules / recycled materials). Currently, twin-screw extruders typically use a fixed-size feed inlet, which is difficult to adapt to feeding requirements under different speed conditions. When the screw speed is high, insufficient material to fill the feed inlet can easily lead to starvation, affecting extruder output and product quality. Conversely, when the screw speed is low, excessive feed volume can cause material accumulation, affecting material conveying and plasticizing effects.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a PVC processing twin-screw machine, including a base, a cylinder on the base, a feed inlet on the cylinder, grooves on both sides of the inner wall of the feed inlet, a blocking component in the groove, two screws in the inner cavity of the cylinder, a first gear on one side of the screw, a second gear meshing between the two first gears, a rotating column on the second gear, a speed regulating motor on one side of the rotating column, an auxiliary measuring metal block on the rotating column, a speed measuring instrument on one side directly above the rotating column, and a control panel on one side of the cylinder.

[0007] Preferably, the groove is inclined.

[0008] Preferably, the speed-regulating motor and the speed measuring instrument are fixedly mounted on the cylinder.

[0009] Preferably, the auxiliary measuring metal block is fixedly installed on the rotating column.

[0010] Preferably, the blocking component includes a component base, and an electric push rod is fixedly disposed on one side of the component base.

[0011] Preferably, the electric push rod is fixedly installed in the groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) When this utility model is used, the speed of the speed-regulating motor is adjusted according to the characteristics of the material. Then the speed-regulating motor drives the second gear to rotate through the rotating column. The second gear drives the screw to rotate through the first gear. The screw mixes and feeds the material. During this period, the speed of the rotating column is monitored by the auxiliary metal block and the speed measuring instrument. Then the control panel starts the electric push rod according to the speed of the rotating column. The two component bases are brought closer or further apart by two different electric push rods. The feedable area of ​​the feed port is adjusted according to the speed of the rotating column, so that the feedable area of ​​the feed port is dynamically adjusted according to the screw speed, optimizing the feeding efficiency, avoiding starvation feeding at high speed or material accumulation at low speed, thereby increasing the output and stabilizing the plasticizing process. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a twin-screw PVC processing machine according to the present invention;

[0015] Figure 2 This is a schematic diagram of the internal structure of a twin-screw PVC processing machine according to the present invention;

[0016] Figure 3 This is a top view of the internal structure of a twin-screw PVC processing machine according to the present invention;

[0017] Figure 4 This is a schematic diagram of the blocking component in a twin-screw PVC processing machine according to the present invention.

[0018] In the diagram: 1. Base; 2. Cylinder; 3. Feed inlet; 4. Groove; 5. Blocking component; 501. Component base; 502. Electric push rod; 6. Screw; 7. First gear; 8. Second gear; 9. Rotating column; 10. Speed ​​regulating motor; 11. Auxiliary measuring metal block; 12. Tachometer; 13. Control panel. Detailed Implementation

[0019] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0020] like Figures 1 to 3As shown, a twin-screw PVC processing machine includes a base 1, a cylinder 2 mounted on the base 1, a feed inlet 3 on the cylinder 2, grooves 4 on both sides of the inner wall of the feed inlet 3, a blocking component 5 within the grooves 4, two screws 6 within the inner cavity of the cylinder 2, a first gear 7 on one side of each screw 6, a second gear 8 meshing between the two first gears 7, a rotating column 9 on the second gear 8, a speed-regulating motor 10 on one side of the rotating column 9, an auxiliary measuring metal block 11 on the rotating column 9, a speed measuring instrument 12 directly above the rotating column 9, and a control panel 13 on one side of the cylinder 2.

[0021] like Figure 4 As shown, in another embodiment of the present invention, the blocking component 5 includes a component base 501, and an electric push rod 502 is fixedly disposed on one side of the component base 501.

[0022] When it is necessary to adjust the feedable area of ​​the feed inlet 3, the two component bases 501 can be moved closer or further apart by using two different electric push rods 502, thereby adjusting the feedable area of ​​the feed inlet 3. At the same time, since the groove 4 is inclined, the component base 501 is also inclined, which allows the material to move between the two component bases 501 under the action of gravity.

[0023] The working principle of this twin-screw PVC processing machine:

[0024] In use, the speed of the variable speed motor 10 is adjusted according to the characteristics of the material. Then, the variable speed motor 10 drives the second gear 8 to rotate through the rotating column 9. The second gear 8 drives the screw 6 to rotate through the first gear 7. The screw 6 mixes and feeds the material. During this period, the speed of the rotating column 9 is monitored by the auxiliary measuring metal block 11 and the speed measuring instrument 12. Then, the control panel 13 starts the electric push rod 502 according to the speed of the rotating column 9. The two different electric push rods 502 make the two component bases 501 move closer or further apart. The feedable area of ​​the feed inlet 3 is adjusted according to the speed of the rotating column 9, so that the feedable area of ​​the feed inlet 3 is dynamically adjusted according to the speed of the screw 6, optimizing the feeding efficiency, avoiding starvation feeding at high speed or material accumulation at low speed, thereby increasing output and stabilizing the plasticizing process.

[0025] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A twin-screw PVC processing machine, comprising a base (1), characterized in that: A cylindrical body (2) is provided on the base (1). A feed inlet (3) is provided on the cylindrical body (2). Grooves (4) are provided on both sides of the inner wall of the feed inlet (3). A blocking component (5) is provided in the groove (4). Two screws (6) are provided in the inner cavity of the cylindrical body (2). A first gear (7) is provided on one side of the screw (6). A second gear (8) is meshed between the two first gears (7). A rotating column (9) is provided on the second gear (8). A speed regulating motor (10) is provided on one side of the rotating column (9). An auxiliary measuring metal block (11) is provided on the rotating column (9). A speed measuring instrument (12) is provided on one side directly above the rotating column (9). A control panel (13) is provided on one side of the cylindrical body (2).

2. A twin-screw machine for processing PVC according to claim 1, characterized in that: The groove (4) is inclined.

3. A twin-screw machine for processing PVC according to claim 2, characterized in that: The speed-regulating motor (10) and the speed measuring instrument (12) are fixedly installed on the cylinder (2).

4. A twin-screw machine for processing PVC according to claim 3, characterized in that: The auxiliary test metal block (11) is fixedly installed on the rotating column (9).

5. A twin-screw PVC processing machine according to claim 4, characterized in that: The blocking component (5) includes a component base (501), and an electric push rod (502) is fixedly installed on one side of the component base (501).

6. A twin-screw machine for processing PVC according to claim 5, characterized in that: The electric push rod (502) is fixedly installed in the groove (4).

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