Double-screw extruder

Abstract

The utility model relates to the technical field of polypropylene films, in particular to a double-screw extruder which comprises a double-screw extruder body and an inner cavity exhaust assembly arranged on the double-screw extruder body, and the inner cavity exhaust assembly comprises a box body connected with the double-screw extruder body in a sliding mode. Through holes are formed in the left side and the right side of the box body, the tops of the through holes are in threaded connection with a cover body, an exhaust pipe is fixedly installed at the center of the cover body, and a filter screen is fixedly installed at the bottom of the cover body through a fixing frame. The double-screw extruder has the advantages that by arranging the inner cavity exhaust assembly, the two filter screens can be switched back and forth for use, so that a worker can conveniently detach the filter screens for independent cleaning, the double-screw extruder does not need to be shut down when the filter screens are cleaned, the production efficiency of the equipment is effectively ensured, meanwhile, impurities in the filter screens can be extruded out in cooperation with deformation of the filter screens, and the product quality is improved. The filter screen can be self-cleaned along with the change of the air pressure, and the single-time use time of the filter screen is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of polypropylene films, in particular to a twin-screw extruder. Background Art

[0002] Cast polypropylene film is a polypropylene film produced by the cast film process. It can be divided into general CPP film, aluminized grade CPP film and cooking grade CPP film. It has excellent effects such as good transparency, uniform thickness, and uniform performance in the vertical and horizontal directions. It is generally used as the inner layer material of composite film. A twin-screw extruder is required in the production of polypropylene film.

[0003] Twin-screw extruder is a common plastic processing equipment, widely used in the production process of plastic products. It consists of two rotating screws, which transport the plastic raw materials from the feed port to the discharge port of the extruder through the rotation of the screws. Compared with the single-screw extruder, the twin-screw extruder has greater production capacity and higher production efficiency. It can better mix and melt the plastic raw materials, so that the extruded plastic products have better quality and uniformity. In addition, the twin-screw extruder can also adapt to a wider range of plastic raw materials, including high molecular polymers and thermoplastic elastomers.

[0004] A twin-screw extruder exhaust and anti-overflow device structure is disclosed in Chinese patent CN214137271U. The twin-screw extruder exhaust and anti-overflow device structure can efficiently filter and intercept the exhaust through a double-layer filter, thereby ensuring the cleanliness of the exhaust chamber and effectively reducing the pollution of the exhaust to the pipeline or vacuum pump device.

[0005] However, compared with the existing technologies in the related fields, in actual use, impurities in the exhaust will adhere to the filter, resulting in poor air circulation of the filter, so that the filter needs to be cleaned after a period of use. The existing equipment needs to be shut down for cleaning or replacement of the filter, so once the equipment is shut down, the production efficiency of the polypropylene film will be affected. Utility Model Content

[0006] The purpose of the present invention is to solve at least one of the above technical deficiencies.

[0007] The purpose of the utility model is to overcome the shortcomings of the prior art, solve the problems mentioned in the background technology, and provide a twin-screw extruder.

[0008] The purpose of the utility model is achieved through the following technical solutions: a twin-screw extruder, comprising a twin-screw extruder body and an inner cavity exhaust component arranged on the twin-screw extruder body, the inner cavity exhaust component comprising a box body slidably connected to the twin-screw extruder body, the left and right sides of the box body are provided with through holes, the top of the through hole is threadedly connected to a cover body, an exhaust pipe is fixedly installed at the center of the cover body, a filter screen is fixedly installed at the bottom of the cover body through a fixing frame, a push rod is fixedly installed at the center of the filter screen, and the through hole is communicated with the inner cavity of the twin-screw extruder body.

[0009] Preferably, the twin-screw extruder body is provided with brackets fixedly mounted on both the front and rear sides of the box body, and the box body is provided with slide grooves at positions corresponding to the brackets.

[0010] By adopting the above technical solution and utilizing the support to cooperate with the slide groove, the stability of the box body when sliding can be improved, and at the same time the sliding range of the box body can be restricted.

[0011] Preferably, the bracket is threadedly connected with a positioning bolt near the top, and the positioning bolt passes through the bracket and fits with the box body.

[0012] By adopting the above technical solution and using the positioning bolts, after the position of the box is adjusted, the positioning bolts can be used to limit the box.

[0013] Preferably, a thread groove is provided on the outer surface of the cover body, and a thread is provided on the top of each through hole, and the thread groove is adapted to the thread.

[0014] By adopting the above technical solution and utilizing the cooperation between the thread groove and the thread, it is possible to facilitate the assembly and disassembly of the cover body and the through hole.

[0015] Preferably, the exhaust pipe is communicated with the through hole, and a rotating wheel is fixedly provided at a position near the top of the exhaust pipe.

[0016] By adopting the above technical solution and utilizing the rotating wheel, the exhaust pipe can drive the cover body to rotate, thereby facilitating the installation or disassembly of the cover body and the through hole.

[0017] Preferably, a vent hole is provided on the upper side of the inner cavity of the twin-screw extruder body, and the diameter of the vent hole is the same as the diameter of the through hole.

[0018] By adopting the above technical solution, the discharge of the twin-screw extruder body during operation can enter the through hole through the exhaust hole, and then the discharge can be filtered and intercepted by the filter screen inside the through hole.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The twin-screw extruder, by providing an inner cavity exhaust component, can achieve the goal of allowing the two filters to be switched back and forth, thereby facilitating the staff to remove the filters for separate cleaning, and then there is no need to shut down the twin-screw extruder when cleaning the filters, effectively ensuring the production efficiency of the equipment, and at the same time, the impurities inside the filters can be squeezed out by the deformation of the filters, so that the filters can be self-cleaned as the air pressure changes, effectively extending the single use time of the filters. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is a structural schematic diagram of the utility model from the first perspective;

[0023] Figure 2 It is a structural schematic diagram of the utility model from a second viewing angle;

[0024] Figure 3 This is a schematic diagram of the structure of the utility model when the through hole is switched;

[0025] Figure 4 This is a schematic diagram of the structure of the inner cavity exhaust component of the utility model;

[0026] Figure 5 This is a schematic diagram of the split structure of the cover body and the through hole of the utility model;

[0027] Figure 6 It is a cross-sectional view of the box body of the utility model.

[0028] In the figure: 1. twin-screw extruder body; 2. inner cavity exhaust assembly; 201. box body; 202. through hole; 203. cover body; 204. exhaust pipe; 205. filter screen; 206. push rod; 207. slide groove; 208. rotating wheel; 209. fixing frame; 3. bracket; 301. positioning bolt. DETAILED DESCRIPTION

[0029] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions 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 addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be 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 by specific circumstances.

[0031] Additional aspects and advantages of the present invention will be further described below in conjunction with the accompanying drawings, and some will become apparent from the following description or be learned through practice of the present invention.

[0032] like Figure 1-6 As shown, a twin-screw extruder comprises a twin-screw extruder body 1 and an inner cavity exhaust assembly 2 arranged on the twin-screw extruder body 1;

[0033] The inner cavity exhaust component 2 includes a box body 201 that is slidably connected to the twin-screw extruder body 1. The twin-screw extruder body 1 is located on both sides of the box body 201, and brackets 3 are fixedly installed. The box body 201 is provided with a slide groove 207 at the position corresponding to the bracket 3. The bracket 3 cooperates with the slide groove 207 to improve the stability of the box body 201 when sliding, and at the same time, the sliding range of the box body 201 can be restricted. The bracket 3 is threadedly connected to the position near the top with a positioning bolt 301, and the positioning bolt 301 passes through the bracket 3 and the box body. The box body 201 is fitted with the positioning bolt 301. When the position of the box body 201 is adjusted, the positioning bolt 301 can be used to limit the box body 201. The left and right sides of the box body 201 are provided with through holes 202. The top of the through hole 202 is threadedly connected with a cover body 203. The outer surface of the cover body 203 is provided with a thread groove (not marked in the figure). The top of the through hole 202 is provided with a thread (not marked in the figure). The thread groove is adapted to the thread. The thread groove and the thread are matched, and the cover body 203 and the through hole 202 can be easily assembled and installed. The cover 203 is convenient for installation and separation from the through hole 202. An exhaust pipe 204 is fixedly installed at the center of the cover 203. The exhaust pipe 204 is connected to the through hole 202. A rotating wheel 208 is fixedly arranged near the top of the exhaust pipe 204. The exhaust pipe 204 can drive the cover 203 to rotate by the rotating wheel 208, so as to facilitate the installation or separation of the cover 203 and the through hole 202. A filter screen 205 is fixedly installed at the bottom of the cover 203 through a fixing frame 209. A top rod 206 is fixedly installed at the center of the filter screen 205. The hole 202 is connected to the inner cavity of the twin-screw extruder body 1 (the inner cavity has been disclosed in the comparative document CN214137271U, so its specific structure is not described and displayed in detail), and an exhaust hole (not shown in the figure) is opened on the upper side of the inner cavity of the twin-screw extruder body 1. The diameter of the exhaust hole is the same as the diameter of the through hole 202, so that the exhaust of the twin-screw extruder body 1 during operation can enter the through hole 202 through the exhaust hole, and then the exhaust is filtered and intercepted by the filter screen 205 inside the through hole 202.

[0034] The working process is as follows:

[0035] S1. When in use, the discharge of the twin-screw extruder body 1 can enter the through hole 202 through the exhaust hole, and then the discharge is filtered and intercepted by the filter 205 inside the through hole 202;

[0036] S2. The gas can cause the filter 205 to deform, and then the filter 205 will cause the top rod 206 to move upward. Therefore, when the filter 205 is blocked, the upward movement of the top rod 206 will increase. Then, when the staff sees that the movement of the top rod 206 increases, they can clean the group of filters 205.

[0037] S3, when cleaning, loosen the positioning bolt 301, and then push the box body 201 so that the other through hole 202 cooperates with the inner cavity of the twin-screw extruder body 1. When the position of the box body 201 is adjusted, the positioning bolt 301 can be used to limit the box body 201;

[0038] S4. By using the rotating wheel 208, the exhaust pipe 204 can drive the cover 203 to rotate, so as to remove the cover 203 of the previous through hole 202;

[0039] S5. The cover 203 can be used to take out the filter screen 205 from the through hole 202 through the fixing frame 209, and then the filter screen 205 can be cleaned.

[0040] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A twin-screw extruder, characterized in that: The invention comprises a twin-screw extruder body (1) and an inner cavity exhaust component (2) arranged on the twin-screw extruder body (1), wherein the inner cavity exhaust component (2) comprises a box body (201) slidably connected to the twin-screw extruder body (1), through holes (202) are provided on both left and right sides of the box body (201), a cover body (203) is threadedly connected to the top of the through hole (202), an exhaust pipe (204) is fixedly installed at the center of the cover body (203), a filter screen (205) is fixedly installed at the bottom of the cover body (203) through a fixing frame (209), a push rod (206) is fixedly installed at the center of the filter screen (205), and the through hole (202) is connected to the inner cavity of the twin-screw extruder body (1).

2. A twin-screw extruder according to claim 1, characterized in that: The twin-screw extruder body (1) is fixedly provided with brackets (3) on both the front and rear sides of the box body (201), and the box body (201) is provided with slide grooves (207) at positions corresponding to the brackets (3).

3. A twin-screw extruder according to claim 2, characterized in that: Positions near the top of the bracket (3) are all threadedly connected with positioning bolts (301), and the positioning bolts (301) penetrate the bracket (3) and fit closely with the box body (201).

4. A twin-screw extruder according to claim 1, characterized in that: The outer surface of the cover body (203) is provided with a thread groove, and the top of each through hole (202) is provided with a thread, and the thread groove is adapted to the thread.

5. A twin-screw extruder according to claim 1, characterized in that: The exhaust pipe (204) is in communication with the through hole (202), and a rotating wheel (208) is fixedly provided near the top of the exhaust pipe (204).

6. A twin-screw extruder according to claim 1, characterized in that: An exhaust hole is provided on the upper side of the inner cavity of the twin-screw extruder body (1), and the diameter of the exhaust hole is the same as the diameter of the through hole (202).

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