Cooling mechanism for PVC extruder

Abstract

The utility model belongs to the technical field of extruders, and particularly relates to a cooling mechanism for a PVC (polyvinyl chloride) extruder, which comprises a charging barrel and a screw, a first circulating pipe is spirally arranged on the charging barrel, one end of the first circulating pipe extends out of the charging barrel and is provided with a cooling liquid circulating component, and the other end of the first circulating pipe is connected with the cooling liquid circulating component after being provided with a first radiating pipe; a second circulating pipe is spirally arranged in the screw rod, the left end of the screw rod is sleeved with a first via hole sliding ring and a second via hole sliding ring, the two ends of the second circulating pipe are connected into the first via hole sliding ring and the second via hole sliding ring respectively, and one end of the second circulating pipe is connected with a cooling liquid circulating assembly after being connected out of the first via hole sliding ring; and the other end is connected with the second through hole slip ring, is provided with the second radiating pipe and is connected with the cooling liquid circulating assembly. The cooling mechanism not only can cool the charging barrel at one end of the extrusion port, but also can cool the interior of the screw, and the problems of material carbonization and material port blockage caused by overheating are avoided through simultaneous cooling of the interior and the exterior.

Description

Technical Field

[0001] The utility model belongs to the technical field of extruders, and particularly relates to a cooling mechanism for a PVC extruder. Background Art

[0002] When the PVC extruder is in operation, the excess heat generated by the shear friction of the rotating screw will cause part of the material to carbonize and accumulate on the outer wall of the screw. At the same time, the molten material at the material port is under great pressure, and the melt temperature is too high, causing the PVC plastic particles to become sticky and block the material port. The cooling mechanism currently on the market can only cool the barrel, and then cool the internal material and the screw through the conduction of the barrel. Since the material is being transported during the temperature transfer process, the internal material is heated and cooled unevenly during actual use, which not only cannot completely solve the carbonization problem, but also easily affects the quality of the extruded product. Therefore, there is a certain market demand for designing a cooling mechanism for uniformly cooling the PVC extruder. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a cooling mechanism for a PVC extruder to solve the above-mentioned problems.

[0004] The utility model discloses a cooling mechanism for a PVC extruder, comprising a barrel and a screw, wherein a first circulation pipe is spirally arranged on the barrel, one end of the first circulation pipe extends out of the barrel and is provided with a coolant circulation component, and the other end is provided with a first heat dissipation pipe, and the first heat dissipation pipe is connected to the coolant circulation component; a second circulation pipe is spirally arranged inside the screw, a first through-hole slip ring and a second through-hole slip ring are sleeved on the left end of the screw, and the two ends of the second circulation pipe are respectively connected to the first through-hole slip ring and the second through-hole slip ring, one end of which is connected to the coolant circulation component after being connected to the first through-hole slip ring, and the other end of which is connected to the second through-hole slip ring and is provided with a second heat dissipation pipe, and the second heat dissipation pipe is connected to the coolant circulation component.

[0005] Furthermore, a temperature sensor is arranged inside the screw.

[0006] Furthermore, the right end of the first circulation pipe has a gradually narrowing pitch and a gradually decreasing spiral diameter toward the right.

[0007] Furthermore, the first circulation pipe and the second circulation pipe are both made of copper pipes.

[0008] Furthermore, a heat-insulating cover is provided on the outer side of the barrel.

[0009] Furthermore, a first heat insulation layer cooperating with the heat preservation cover is arranged on the barrel, and a second heat insulation layer cooperating with the second circulation pipe is arranged inside the screw.

[0010] Furthermore, the first heat dissipation tube and the second heat dissipation tube are both finned tubes.

[0011] Furthermore, a group of cooling fans are disposed on one side of each of the first heat dissipation tube and the second heat dissipation tube.

[0012] Compared with the prior art, this cooling mechanism can not only cool the barrel at one end of the extruder, but also cool the inside of the screw. By cooling both inside and outside at the same time, it can avoid carbonization of the material and blockage of the feed port caused by overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] In the figure: 1. barrel; 2. screw; 3. first circulation pipe; 4. first heat dissipation pipe; 5. coolant circulation assembly; 6. second circulation pipe; 7. first through-hole slip ring; 8. second through-hole slip ring; 9. second heat dissipation pipe; 10. thermal insulation cover; 11. first thermal insulation layer; 12. second thermal insulation layer; 13. cooling fan. DETAILED DESCRIPTION

[0015] In order to better understand the present invention, Figure 1 The implementation modes of the present utility model will be explained in detail.

[0016] It should be noted that the directions "front, back, left, right, up, down" mentioned in the text are all based on Figure 1 The directions of “front, back, left, right, up, and down” are used as the basis.

[0017] The utility model discloses a cooling mechanism for a PVC extruder, comprising a barrel 1 and a screw 2 of the extruder, wherein a first circulation pipe 3 is spirally arranged on the barrel 1, one end of the first circulation pipe 3 extends out of the barrel 1 and is provided with a coolant circulation component 5, and the other end is provided with a first heat dissipation pipe 4, and the first heat dissipation pipe 4 is connected to the coolant circulation component 5; a second circulation pipe 6 is spirally arranged inside the screw 2, a first through-hole slip ring 7 and a second through-hole slip ring 8 (existing technology, through-hole gas-liquid slip ring) are sleeved on the left end of the screw 2, and the two ends of the second circulation pipe 6 are respectively connected to the first through-hole slip ring 7 and the second through-hole slip ring 8, one end of which is connected to the coolant circulation component 5 after being connected to the first through-hole slip ring 7, and the other end of which is connected to the second through-hole slip ring 8 and is provided with a second heat dissipation pipe 9, and the second heat dissipation pipe 9 is connected to the coolant circulation component 5. The coolant circulation component 5 specifically includes a container for containing coolant, and is internally provided with a circulation pump connected to the first circulation pipe 3 and the second circulation pipe 6 respectively. Through the operation of the two circulation pumps, part of the coolant in the coolant container circulates in the first circulation pipe 3 and the second circulation pipe 6 respectively.

[0018] The preferred technical solution in this embodiment is that a temperature sensor is provided in the screw 2, and the temperature sensor is connected to the circulation pump of the second circulation pipe 6. The higher the temperature detected by the temperature sensor, the faster the circulation speed of the circulation pump.

[0019] The preferred technical solution in this embodiment takes into account that when the first circulation pipe 3 cools the barrel 1, under the influence of the heated material in the barrel 1, the temperature of the coolant in the first circulation pipe 3 is higher as it is closer to the extrusion port, resulting in a decrease in the subsequent cooling capacity. Figure 1 As shown in the figure, the right end of the first circulation pipe 3 gradually narrows the pitch and the spiral diameter gradually decreases. For example, if the left end pitch is 5CM, the adjacent right end pitch is 4CM, and gradually narrows toward the right; if the left end spiral diameter is 12CM, the adjacent right end spiral diameter is 11CM, and gradually decreases toward the right. The cooling circulation speed of the first circulation pipe 3 to the right end of the barrel 1 is accelerated to increase the cooling range of the barrel 1 in the area and the cooling liquid.

[0020] In the preferred technical solution of this embodiment, in order to improve the temperature conduction efficiency, the first circulation pipe 3 and the second circulation pipe 6 are both made of copper pipes.

[0021] In the preferred technical solution of this embodiment, a heat preservation cover 10 is provided on the outer side of the barrel 1 to reduce temperature loss.

[0022] The preferred technical solution in this embodiment is that the barrel 1 is provided with a first insulation layer 11 that cooperates with the heat preservation cover 10. Specifically, the first insulation layer 11 is used to distinguish the heating area and the cooling area of ​​the barrel 1; the screw 2 is provided with a second insulation layer 12 that cooperates with the second circulation pipe 6, which is used to insulate the second circulation pipe 6 on the left side inside the screw 2 to avoid unnecessary heating of the coolant.

[0023] In the preferred technical solution of this embodiment, the first heat dissipation tube 4 and the second heat dissipation tube 9 are both finned tubes.

[0024] According to the preferred technical solution in this embodiment, the first heat dissipation tube 4 and the second heat dissipation tube 9 are arranged in an S shape, and a group of cooling fans 13 are provided on one side of the first heat dissipation tube 4 and the second heat dissipation tube 9 for cooling the surface of the first heat dissipation tube 4 and the second heat dissipation tube 9, thereby cooling the internal coolant.

[0025] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0026] In the description of the present utility model, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling mechanism for a PVC extruder, comprising a barrel (1) and a screw (2), Features: A first circulation pipe (3) is spirally arranged on the barrel (1), one end of the first circulation pipe (3) extends out of the barrel (1) and is provided with a coolant circulation component (5), and the other end is provided with a first heat dissipation pipe (4), and the first heat dissipation pipe (4) is connected to the coolant circulation component (5); a second circulation pipe (6) is spirally arranged inside the screw (2), a first through-hole slip ring (7) and a second through-hole slip ring (8) are sleeved on the left end of the screw (2), and the two ends of the second circulation pipe (6) are respectively connected to the first through-hole slip ring (7) and the second through-hole slip ring (8), one end of which is connected to the coolant circulation component (5) after being connected to the first through-hole slip ring (7), and the other end of which is connected to the second through-hole slip ring (8) and is provided with a second heat dissipation pipe (9), and the second heat dissipation pipe (9) is connected to the coolant circulation component (5).

2. A cooling mechanism for a PVC extruder as claimed in claim 1, Features: A temperature sensor is arranged inside the screw (2).

3. A cooling mechanism for a PVC extruder as claimed in claim 1, Features: The right end of the first circulation pipe (3) has a gradually narrowing pitch and a gradually decreasing spiral diameter toward the right.

4. A cooling mechanism for a PVC extruder as claimed in claim 1, Features: The first circulation pipe (3) and the second circulation pipe (6) are both made of copper pipes.

5. A cooling mechanism for a PVC extruder as claimed in claim 1, Features: The outer side of the barrel (1) is provided with a heat-insulating cover (10).

6. A cooling mechanism for a PVC extruder as claimed in claim 1, Features: The barrel (1) is provided with a first heat insulation layer (11) matched with the heat preservation cover (10), and the screw (2) is provided with a second heat insulation layer (12) matched with the second circulation pipe (6).

7. A cooling mechanism for a PVC extruder as claimed in claim 1, Features: The first heat dissipation tube (4) and the second heat dissipation tube (9) are both finned tubes.

8. A cooling mechanism for a PVC extruder as claimed in claim 1, Features: A group of cooling fans (13) are provided on one side of each of the first heat dissipation tube (4) and the second heat dissipation tube (9).

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