Air seal mechanism applied to extruder driving box

Abstract

The utility model relates to the technical field of extrusion equipment, in particular to an air seal mechanism applied to a driving box of an extruder, which comprises an air seal component, and dust-shaped raw materials are prevented from entering the driving box to cause pollution and influence the normal work of the extruder through air seal; specifically, the air seal assembly comprises an air seal ring and a gland, an air flow channel is formed in the gland, air is introduced into the air flow channel, and an air curtain is formed between the air seal ring and the screw after the air is discharged out of the gland so as to prevent dust raw materials from flowing back into the driving box. In addition, a circulating flow channel is arranged on the inner wall of the gas sealing ring, flowing of gas is limited, and a better gas sealing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of extrusion equipment, in particular to an air sealing mechanism applied to a driving box of an extruder. Background Art

[0002] Twin-screw extruders are widely used in the blending and modification of filling, reinforcement, toughening, etc. of general plastics, engineering plastics, thermoplastics, rubber and other polymer materials, as well as in the processing of special fibers, special adhesives and other fields.

[0003] In the process of adding raw materials into the barrel through the material barrel, due to the gap between the screw and the drive box, it is impossible to use a sealing ring to achieve sealing. There is a certain probability that the raw materials will enter the drive box and affect the normal operation of the extruder. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide an air sealing mechanism applied to an extruder drive box.

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

[0006] An air sealing mechanism applied to an extruder drive box, comprising:

[0007] A connecting piece, wherein the connecting piece is provided with a connecting hole; and

[0008] An air sealing assembly, the air sealing assembly comprising an air sealing ring fixed to the inner side of the connecting hole, and a pressure cover fixed to an opening at one end of the connecting hole; the pressure cover and the air sealing ring are both annular structures, a vertically arranged gas flow channel is provided on the inner side of the pressure cover, an air inlet hole connected to the gas flow channel is provided on the outer wall of the pressure cover, and an air outlet hole connected to the gas flow channel is provided on the side of the pressure cover facing the air sealing ring.

[0009] Preferably, an annular limiting portion is provided at one end opening of the connecting hole, and the limiting portion abuts against the gland to prevent the gland from falling off.

[0010] Preferably, the inner wall of the air sealing ring is provided with a plurality of grooves arranged equidistantly along the axial direction, and gaps are provided between the grooves. The gaps realize the communication between the grooves, and the gaps and the grooves form a circulation channel; the gaps are aligned with the air outlet.

[0011] Preferably, a guide slope is provided at one end of the gas sealing ring facing the gland, and the guide slope is used to guide the gas into the circulation channel.

[0012] Preferably, a stopper is provided at one end of the air sealing ring away from the gland.

[0013] Preferably, the aperture of the air inlet hole is larger than the aperture of the gas flow channel.

[0014] Preferably, the gland extends an annular connecting ring, and the outer diameter of the connecting ring is consistent with the inner diameter of the connecting hole.

[0015] Preferably, the gland and the connector are provided with assembly holes, and the assembly holes realize the assembly connection between the gland and the connector.

[0016] Preferably, the number of the connecting holes is two, and the number of the air sealing assemblies is two.

[0017] Preferably, the outer wall of the gland is provided with a connecting level.

[0018] The beneficial effects of the utility model are:

[0019] The utility model relates to an air sealing mechanism applied to an extruder drive box, comprising an air sealing component, which prevents dusty raw materials from entering the drive box to cause pollution and affect the normal operation of the extruder through air sealing; specifically, the air sealing component comprises an air sealing ring and a pressure cover, and a gas flow channel is provided on the pressure cover, and gas is introduced into the gas flow channel. After the gas is discharged from the pressure cover, a wind curtain is formed between the air sealing ring and the screw to prevent dusty raw materials from flowing back into the drive box; in addition, a circulation flow channel is provided on the inner wall of the air sealing ring to limit the flow of gas and achieve a better air sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the gas sealing mechanism of the utility model applied to the extruder drive box;

[0021] Figure 2 for Figure 1 Schematic diagram of the structural explosion of the gas sealing mechanism applied to the extruder drive box;

[0022] Figure 3 for Figure 2 A schematic diagram of the structure of the connecting parts in FIG.

[0023] Figure 4 for Figure 2 A schematic diagram of the structure of the gland in FIG.

[0024] Figure 5 for Figure 4 Section view along AA;

[0025] Figure 6 for Figure 2 A schematic diagram of the structure of the gas sealing ring;

[0026] Figure 7 The utility model is a schematic diagram of the use state of the air sealing mechanism applied to the extruder drive box.

[0027] Numbers in the figure:

[0028] 10-connecting piece; 11-connecting hole; 12-limiting part;

[0029] 20-gas seal assembly;

[0030] 21-gas sealing ring; 211-groove; 212-notch; 213-circulation channel; 214-guide slope; 215-stopper;

[0031] 22- gland; 221- gas flow channel; 222- air inlet; 223- air outlet; 224- connecting ring; 225- assembly hole; 226- connecting level;

[0032] 30- drive box;

[0033] 40-Feed barrel. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] like Figures 1 to 7As shown, the utility model is an air sealing mechanism applied to the extruder drive box, comprising a connecting piece 10 and an air sealing assembly 20; wherein the connecting piece 10 is penetrated by a connecting hole 11; the air sealing assembly 20 comprises an air sealing ring 21 fixed to the inner side of the connecting hole 11, and a pressure cover 22 fixed to an opening at one end of the connecting hole 11; the pressure cover 22 and the air sealing ring 21 are both annular structures, a vertically arranged gas flow channel 221 is provided on the inner side of the pressure cover 22, an air inlet hole 222 connected to the gas flow channel 221 is provided on the outer wall of the pressure cover 22, and an air outlet hole 223 connected to the gas flow channel 221 is provided on the side of the pressure cover 22 facing the air sealing ring 21.

[0038] See also Figure 7 As shown, when in use, the connector 10 and the gas seal assembly 20 are installed between the drive box 30 and the feed barrel 40 by bolts, and the screw is arranged on the inner side of the gas seal assembly 20. The air inlet 222 is connected to the air pipe joint, and the outside world supplies gas to the gas flow channel 221. The gas passes through the air inlet 222, the gas flow channel 221 and the exhaust hole in sequence, and finally is discharged toward the gas seal ring 21, forming a wind curtain between the screw and the gas seal ring 21, thereby limiting the backflow of the powder raw material into the drive box 30, and achieving the purpose of gas sealing.

[0039] A further improvement to the above solution is that an annular limiting portion 12 is provided at one end opening of the connecting hole 11 , and the limiting portion 12 abuts against the pressing cover 22 to prevent the pressing cover 22 from falling off.

[0040] For further improvement of the above scheme, please refer to Figure 6 As shown, the inner wall of the gas sealing ring 21 is provided with a plurality of grooves 211 arranged equidistantly along the axial direction, and notches 212 are provided between the grooves 211. The notches 212 realize the communication of the grooves 211, and the notches 212 and the grooves 211 form a circulation channel 213; the notches 212 are aligned with the air outlet 223, and the gas enters the circulation channel 213 through the notches 212 for circulation, thereby forming an air seal between the screw and the gas sealing ring 21.

[0041] A further improvement to the above scheme is that a guide slope 214 is provided at one end of the gas seal ring 21 facing the gland 22, and the guide slope 214 is used to guide the gas into the circulation channel 213. A stopper 215 is provided at one end of the gas seal ring 21 away from the gland 22, and the gas flows to the stopper 215 and collides, and then flows radially to form a wind curtain, thereby preventing dusty raw materials from entering the drive box 30.

[0042] A further improvement to the above solution is that the aperture of the air inlet hole 222 is larger than the aperture of the gas flow channel 221 , so as to facilitate the connection of the air pipe joint at the air inlet hole 222 .

[0043] A further improvement to the above scheme is that the gland 22 extends an annular connecting ring 224, the outer diameter of the connecting ring 224 is consistent with the inner diameter of the connecting hole 11, and the connecting ring 224 is stuck in the connecting hole 11 to improve the connection stability of the gland 22. At the same time, the gland 22 and the connecting member 10 are provided with an assembly hole 225, and a bolt is screwed into the assembly hole 225 to realize the assembly connection between the gland 22 and the connecting member 10.

[0044] In this embodiment, the extruder is a twin-screw extruder, so the number of the connecting holes 11 is two, and the number of the corresponding air sealing components 20 is also two. In order to splice the two glands 22 together, a connecting level 226 is provided on the outer wall of the gland 22.

[0045] Compared with the prior art, the utility model relates to an air sealing mechanism applied to an extruder drive box, comprising an air sealing assembly 20, which prevents dusty raw materials from entering the drive box 30 and causing pollution through air sealing, thereby affecting the normal operation of the extruder; specifically, the air sealing assembly 20 comprises an air sealing ring 21 and a pressure cover 22, on which a gas flow channel 221 is provided, and gas is introduced into the gas flow channel 221. After the gas is discharged from the pressure cover 22, a wind curtain is formed between the air sealing ring 21 and the screw to prevent dusty raw materials from flowing back into the drive box 30; in addition, a circulation flow channel 213 is provided on the inner wall of the air sealing ring 21 to limit the flow of gas and achieve a better air sealing effect.

[0046] 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. An air sealing mechanism applied to an extruder drive box, characterized in that: include: A connecting piece, wherein the connecting piece is provided with a connecting hole; and An air sealing assembly, the air sealing assembly comprising an air sealing ring fixed to the inner side of the connecting hole, and a pressure cover fixed to an opening at one end of the connecting hole; the pressure cover and the air sealing ring are both annular structures, a vertically arranged gas flow channel is provided on the inner side of the pressure cover, an air inlet hole connected to the gas flow channel is provided on the outer wall of the pressure cover, and an air outlet hole connected to the gas flow channel is provided on the side of the pressure cover facing the air sealing ring.

2. The air sealing mechanism for an extruder drive box according to claim 1, characterized in that: An annular limiting portion is provided at one end opening of the connecting hole, and the limiting portion abuts against the gland to prevent the gland from falling off.

3. The air sealing mechanism for an extruder drive box according to claim 1, characterized in that: The inner wall of the air sealing ring is provided with a plurality of grooves arranged equidistantly along the axial direction, and gaps are provided between the grooves. The gaps realize the communication between the grooves, and the gaps and the grooves form a circulation flow channel; the gaps are aligned with the air outlet.

4. The air sealing mechanism applied to the extruder drive box according to claim 3, characterized in that: A guide slope is provided on one end of the gas sealing ring facing the gland, and the guide slope is used to guide gas into the circulation channel.

5. The air sealing mechanism applied to the extruder drive box according to claim 3, characterized in that: A stopper is provided at one end of the air sealing ring away from the gland.

6. The air sealing mechanism for an extruder drive box according to claim 1, characterized in that: The aperture of the air inlet hole is larger than the aperture of the gas flow channel.

7. The air sealing mechanism for an extruder drive box according to claim 1, characterized in that: An annular connecting ring extends from the gland, and the outer diameter of the connecting ring is consistent with the inner diameter of the connecting hole.

8. The air sealing mechanism applied to the extruder drive box according to claim 1, characterized in that: The gland and the connector are provided with assembly holes, and the assembly holes realize the assembly connection between the gland and the connector.

9. The air sealing mechanism applied to the extruder drive box according to claim 1, characterized in that: The number of the connecting holes is two, and the number of the air sealing components is two.

10. The air sealing mechanism applied to the extruder drive box according to claim 9, characterized in that: The outer wall of the gland is provided with a connecting level.

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