Screw rod applied to lateral vacuum exhaust

Abstract

The utility model relates to the technical field of screw extruders, in particular to a screw applied to lateral vacuum exhaust, which comprises a mandrel, a material pressing element and an exhaust element, the material pressing element presses materials through thread rotation, and the exhaust element discharges condensate and pollutants through thread rotation, so that the purposes of exhaust and pollution discharge can be achieved; in addition, as the thread directions of the material pressing element and the exhaust element are opposite, the materials cannot pass through the joint of the material pressing element and the exhaust element and are limited not to enter a vacuum chamber of the lateral vacuum exhaust device, and the influence of material blockage on use is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of screw extruders, in particular to a screw used for lateral vacuum exhaust. Background Art

[0002] With the development of industrial technology, the co-rotating twin-screw extruder, as the main processing equipment for filling, engineering plastics, etc., has been widely used in the polymer processing industry due to its excellent conveying and pressure-building capabilities, good mixing performance, and high melt plasticization efficiency.

[0003] Twin-screw extruders are often used with side vacuum exhaust devices. The side vacuum exhaust device mainly presses the material by rotating the screw, and the vacuum machine extracts the gas to achieve exhaust. However, during the exhaust process, the material easily enters the exhaust device through the screw, causing blockage. In view of this situation, a screw that can avoid material blockage is proposed. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide a screw for lateral vacuum exhaust.

[0005] The utility model adopts the following technical solutions:

[0006] A screw rod used for lateral vacuum exhaust comprises a core shaft, a material pressing element sleeved on the front end of the outer side of the core shaft, and an exhaust element sleeved on the rear end of the outer side of the core shaft; the material pressing element and the exhaust element are both cylindrical, and the outer sides of the material pressing element and the exhaust element are both provided with threads, and the directions of the threads on the outer sides of the material pressing element and the exhaust element are opposite.

[0007] Preferably, the material pressing element comprises a plurality of first threaded blocks fixedly connected end to end.

[0008] Preferably, the exhaust element comprises a plurality of second threaded blocks fixedly connected end to end.

[0009] Preferably, the outer thread pitch of the pressing element is 55-65 mm.

[0010] Preferably, the outer side pitch of the exhaust element is 85-95 mm.

[0011] Preferably, the outer side of the core shaft is provided with a plurality of axially arranged connecting grooves, and the inner walls of the pressing element and the exhaust element are provided with connecting ridges, and the connecting ridges are snapped into the connecting grooves to assemble the pressing element and the exhaust element on the outer side of the core shaft.

[0012] Preferably, a limiting portion extends from the outer side of the core shaft, a screw head is installed at the front end of the core shaft, a mounting position is formed between the screw head and the limiting portion, the pressing element is arranged at one end of the mounting position close to the screw head, and the exhaust element is arranged at one end of the mounting position close to the limiting portion.

[0013] Preferably, a distance sleeve is provided in the installation position, and the distance sleeve is provided between the exhaust element and the limiting portion.

[0014] Preferably, a countersunk hole is provided at one end of the pressing element close to the screw head, and the screw head is arranged in the countersunk hole.

[0015] Preferably, a transmission member is fixedly provided at one end of the core shaft away from the material pressing element, and teeth for transmission are provided on the outer side of the transmission member.

[0016] The beneficial effects of the utility model are:

[0017] The screw used for lateral vacuum exhaust involved in the utility model comprises a core shaft, a material pressing element and an exhaust element. The material pressing element presses the material by rotating the thread, and the exhaust element exhausts the condensate and pollutants by rotating the thread, so as to achieve the purpose of exhaust and sewage discharge. In addition, since the thread directions of the material pressing element and the exhaust element are opposite, the material cannot pass through the intersection of the material pressing element and the exhaust element, so that the material cannot enter the vacuum chamber of the lateral vacuum exhaust device, thereby avoiding material blockage affecting the use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the screw used for lateral vacuum exhaust of the utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the structural explosion of the screw used for lateral vacuum exhaust;

[0020] Figure 3 This is a schematic diagram of the use state of the screw used for lateral vacuum exhaust of the utility model;

[0021] Figure 4 for Figure 3 Half section view.

[0022] Numbers in the figure:

[0023] 10- mandrel; 11- connecting groove; 12- limiting part; 13- screw head; 14- mounting position; 15- fixed distance sleeve; 16- transmission member; 17- meshing teeth;

[0024] 20-pressing element; 21-first threaded block; 22-connecting convex strip; 23-counter sinker hole;

[0025] 30-exhaust element; 31-second threaded block;

[0026] 40 - lateral vacuum exhaust device; 41 - upper end discharge port; 42 - lower end discharge port. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "vertical direction", "upper", "lower", "horizontal" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or a connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1 to Figure 2 As shown, the screw used for lateral vacuum exhaust of the utility model includes a core shaft 10, a pressing element 20 sleeved on the front end of the outer side of the core shaft 10, and an exhaust element 30 sleeved on the rear end of the outer side of the core shaft 10; the pressing element 20 and the exhaust element 30 are both cylindrical, and the outer sides of the pressing element 20 and the exhaust element 30 are both provided with threads, and the directions of the threads on the outer sides of the pressing element 20 and the exhaust element 30 are opposite.

[0031] See also Figure 3 and Figure 4As shown, when in use, the screw of the utility model is installed in the lateral vacuum exhaust device 40, and the motor is connected to rotate the screw. The upper end discharge port 41 in the figure is connected to the vacuum pump to generate vacuum to discharge the gas, and the condensate is discharged from the lower end discharge port 42 under the action of gravity. The front section of the pressing element 20 presses the material through the forward thread, and the exhaust element 30 of the rear section discharges the condensate and pollutants through the reverse thread. Since the outer threads of the pressing element 20 and the exhaust element 30 are in opposite directions, the material cannot pass through the intersection of the pressing element 20 and the exhaust element 30, and the material cannot pass through the upper end discharge port 41 and the lower end discharge port 42, causing material blockage.

[0032] A further improvement to the above scheme is that the pressing element 20 includes a plurality of first threaded blocks 21 fixedly connected end to end; and the exhaust element 30 includes a plurality of second threaded blocks 31 fixedly connected end to end. Both the pressing element 20 and the exhaust element 30 adopt a modular structure, and the length of the pressing element 20 can be adjusted by adjusting the number of the first threaded blocks 21, and the length of the exhaust element 30 can be adjusted by adjusting the number of the second threaded blocks 31, so as to facilitate adjustment.

[0033] A further improvement to the above solution is that the outer thread pitch of the pressing element 20 is 55-65 mm, and the outer thread pitch of the exhaust element 30 is 85-95 mm.

[0034] A further improvement to the above scheme is that a plurality of axially arranged connecting grooves 11 are provided on the outer side of the core shaft 10, and connecting ridges 22 are provided on the inner walls of the pressing element 20 and the exhaust element 30. The pressing element 20 and the exhaust element 30 are assembled on the outer side of the core shaft 10 by snapping together the connecting ridges 22 and the connecting grooves 11.

[0035] A further improvement to the above scheme is that a limiting portion 12 extends from the outer side of the mandrel 10, a screw head 13 is mounted on the front end of the mandrel 10, and the distance between the screw head 13 and the limiting portion 12 forms a mounting position 14; the pressing element 20 and the exhaust element 30 are both mounted in the mounting position 14, specifically, the pressing element 20 is arranged at one end close to the screw head 13, and the exhaust element 30 is arranged at one end close to the limiting portion 12. A distance sleeve 15 is also arranged in the mounting position 14, and the distance sleeve 15 is arranged between the exhaust element 30 and the limiting portion 12 to adjust or fix the distance between the exhaust element 30 and the limiting portion 12. A countersunk hole 23 is provided at one end of the pressing element 20 close to the screw head 13, and the screw head 13 can be arranged in the countersunk hole 23.

[0036] A further improvement to the above scheme is that a transmission member 16 is fixedly provided at one end of the core shaft 10 away from the pressing element 20, and teeth 17 for transmission are provided on the outer side of the transmission member 16, and transmission between the screw and the motor is achieved through the teeth 17 and the transmission member 16.

[0037] Compared with the prior art, the screw used for lateral vacuum exhaust involved in the utility model includes a core shaft 10, a pressing element 20 and an exhaust element 30. The pressing element 20 presses the material by rotating the thread, and the exhaust element 30 exhausts the condensate and pollutants by rotating the thread, so as to achieve the purpose of exhaust and sewage discharge; in addition, since the thread directions of the pressing element 20 and the exhaust element 30 are opposite, the material cannot pass through the intersection of the pressing element 20 and the exhaust element 30, which restricts the material from entering the vacuum chamber of the lateral vacuum exhaust device 40, avoiding material blockage and affecting the use.

[0038] The above only expresses the preferred technical solution of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and the utility model is also intended to include these modifications and modifications.

Claims

1. A screw for lateral vacuum exhaust, characterized in that: It includes a core shaft, a material pressing element sleeved on the front end of the outer side of the core shaft, and an exhaust element sleeved on the rear end of the outer side of the core shaft; the material pressing element and the exhaust element are both cylindrical, and the outer sides of the material pressing element and the exhaust element are both provided with threads, and the directions of the threads on the outer sides of the material pressing element and the exhaust element are opposite.

2. The screw for lateral vacuum exhaust according to claim 1, characterized in that: The material pressing element comprises a plurality of first threaded blocks which are fixedly connected end to end.

3. The screw for lateral vacuum exhaust according to claim 1, characterized in that: The exhaust element includes a plurality of second threaded blocks which are fixedly connected end to end.

4. The screw for lateral vacuum exhaust according to claim 1, characterized in that: The outer thread pitch of the pressing element is 55-65mm.

5. The screw for lateral vacuum exhaust according to claim 1, characterized in that: The outer thread pitch of the exhaust element is 85-95 mm.

6. The screw for lateral vacuum exhaust according to claim 1, characterized in that: The outer side of the core shaft is provided with a plurality of axially arranged connecting grooves, and the inner walls of the pressing element and the exhaust element are provided with connecting ridges, which are snapped into the connecting grooves to assemble the pressing element and the exhaust element on the outer side of the core shaft.

7. The screw for lateral vacuum exhaust according to claim 1, characterized in that: A limiting portion extends from the outer side of the core shaft, a screw head is mounted on the front end of the core shaft, a mounting position is formed between the screw head and the limiting portion, the pressing element is arranged at one end of the mounting position close to the screw head, and the exhaust element is arranged at one end of the mounting position close to the limiting portion.

8. The screw for lateral vacuum exhaust according to claim 7, characterized in that: A distance sleeve is arranged in the installation position, and the distance sleeve is arranged between the exhaust element and the limiting part.

9. The screw for lateral vacuum exhaust according to claim 8, characterized in that: A countersunk hole is arranged at one end of the pressing element close to the screw head, and the screw head is arranged in the countersunk hole.

10. The screw for lateral vacuum exhaust according to claim 1, characterized in that: A transmission member is fixedly provided at one end of the core shaft away from the material pressing element, and teeth for transmission are provided on the outer side of the transmission member.

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