Injection press cover and screw extruder

Abstract

The utility model relates to the technical field of screw extruders, and discloses a liquid injection pressing cover and a screw extruder, the liquid injection pressing cover comprises a cover body and a boss, the boss is arranged on the top of the cover body, the bottom of the cover body is provided with a groove, the top of the boss is provided with a liquid injection hole, and the liquid injection hole is communicated with the groove. When the liquid injection pressing cover is applied to the screw extruder, in the cover body, the side face where the groove is located faces the interior of a screw barrel of the screw extruder, and the side face where the boss is located faces the exterior of the screw barrel, so that in the working process of the screw extruder, due to the arrangement of the groove, a certain distance is formed between the end, facing the screw barrel, of the liquid injection hole and a melt; and the melt is not in direct contact with the liquid injection hole, so that the liquid injection hole is not easily blocked by the melt.

Description

Technical Field

[0001] The utility model relates to the technical field of screw extruders, in particular to an injection-molded liquid cover and a screw extruder. Background Art

[0002] In the screw extruder, an injection liquid cover is provided on the screw barrel, and an injection hole connected to the screw barrel is provided on the injection liquid cover, and an injection valve is connected to the injection hole. For some products containing liquid in the formulation system, liquid is injected into the screw barrel through the injection valve to mix the liquid with the melt; however, in the related art, the injection liquid cover is a block structure, and the injection hole is connected to the two opposite sides of the injection liquid cover, and one of the two sides faces the inside of the screw barrel, and the other is located outside the screw barrel. The injection valve is located on the side outside the screw barrel. In the injection liquid cover of this structure, the end of the injection hole facing the inside of the screw barrel is easy to contact with the melt, and the huge pressure inside the screw barrel is easy to cause the melt to block the injection hole, which will make the injection work impossible. Utility Model Content

[0003] The utility model aims to provide a liquid injection cover which is applied to a screw extruder and whose injection hole is not easily blocked by the melt.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a liquid injection cover suitable for a screw extruder, comprising a cover body and a boss, wherein the boss is arranged on the top of the cover body, a groove is arranged at the bottom of the cover body, and an injection hole is arranged on the top of the boss, and the injection hole is connected to the groove.

[0005] In a specific embodiment of the utility model, the boss has an inner cavity, the inner cavity has an opening, the opening is located on the bottom surface of the groove, and the injection hole runs through the top of the boss to the inner cavity.

[0006] In a specific embodiment of the utility model, a pressure monitoring hole is also provided on the top of the boss, and the pressure monitoring hole is connected to the inner cavity.

[0007] In a specific embodiment of the present invention, the injection hole has an internal thread.

[0008] In a specific embodiment of the utility model, the groove has a first groove side surface and a second groove side surface which are inclined, and the angles between the first groove side surface, the second groove side surface and the groove bottom surface are all greater than 90°, and the first groove side surface is adjacent to the second groove side surface.

[0009] In a specific embodiment of the present invention, it further comprises a nano anti-stick coating, and the nano anti-stick coating is disposed on the side surface of the first groove and the side surface of the second groove.

[0010] In a specific embodiment of the utility model, the groove side surfaces of the groove, and the groove side surfaces and the groove bottom surface are connected by rounded corner transition.

[0011] The utility model also provides a screw extruder, comprising a screw barrel, a liquid injection valve and the liquid injection cover as described above, wherein the liquid injection cover is connected to the screw barrel, and the liquid injection valve is sealed and connected to the liquid injection hole.

[0012] The utility model embodiment of an injection molding cap and a screw extruder has the following beneficial effects compared with the prior art:

[0013] The liquid injection cover of the utility model is applied to a screw extruder. At this time, in the cover body, the side where the groove is located faces the inside of the screw barrel of the screw extruder, and the side where the boss is located faces the outside of the screw barrel. Based on this, during the operation of the screw extruder, the arrangement of the groove makes it possible for a certain distance between the end of the liquid injection hole facing the screw barrel and the melt, and the melt will not directly contact the liquid injection hole. Therefore, the liquid injection hole is not easily blocked by the melt. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a hydraulic injection cover according to an embodiment of the utility model;

[0015] Figure 2 It is a bottom view of the hydraulic injection cover of the embodiment of the utility model;

[0016] Figure 3 This utility model embodiment Figure 2 Cross-sectional view at AA in the middle.

[0017] In the figure, 1, cover body; 10, groove; 101, first groove side; 102, second groove side; 2, boss; 201, injection hole; 202, inner cavity; 203, pressure monitoring hole. DETAILED DESCRIPTION

[0018] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0019] A screw extruder in an embodiment of the utility model includes a screw barrel, a liquid injection valve and a liquid injection cover as described below, the liquid injection cover is connected to the screw barrel, the liquid injection valve is sealed and connected to the liquid injection hole 201, specifically, the outer wall of the screw barrel is provided with a mounting through hole, the mounting through hole is connected to the inside of the screw barrel, and the liquid injection cover is connected to the mounting hole. The screw extruder is a prior art, and the utility model does not make too many redundant descriptions on this.

[0020] like Figure 1-3As shown, an injection liquid cover of an embodiment of the utility model includes a cover body 1 and a boss 2, the boss 2 is arranged on the top of the cover body 1, the bottom of the cover body is provided with a groove 10, the top of the boss 2 is provided with an injection hole 201, and the injection hole 201 is connected to the groove 10.

[0021] Specifically, when the injection liquid cap is applied to a screw extruder, in the cap body 1, the groove 10 faces the inside of the screw barrel of the screw extruder, and the boss 2 faces the outside of the screw barrel. Based on this, during the operation of the screw extruder, the arrangement of the groove 10 makes it possible for the injection hole 201 to have a certain distance from the end facing the screw barrel and the melt, so that the melt will not directly contact the injection hole 201. Therefore, the injection hole 201 is not easily blocked by the melt.

[0022] Furthermore, the boss 2 has an inner cavity 202, and the inner cavity 202 has an opening, which is located on the bottom surface of the groove 10. The injection hole 201 passes through the top of the boss 2 to the inner cavity 202. The existence of the inner cavity 202 allows the injection hole 201 to have a larger distance from the end of the screw barrel facing the melt, which can further avoid direct contact between the melt and the injection hole 201, and the injection hole 201 is less likely to be blocked by the melt.

[0023] The depths of the groove 10 and the inner cavity 202 are set according to actual applications, and the present invention does not impose any limitation thereto.

[0024] Furthermore, a pressure monitoring hole 203 is provided on the top of the boss 2, and the pressure monitoring hole 203 is connected to the inner cavity 202. In practical applications, the pressure monitoring hole 203 is connected to the pressure alarm through a hose to monitor the air pressure in the screw barrel. When an abnormality occurs or too much flammable and explosive liquid is injected, causing excessive pressure in the screw barrel, the pressure alarm can sound an alarm in time to remind employees to discover and deal with the abnormality and avoid dangerous situations.

[0025] In other embodiments, the pressure monitoring hole 203 can also be used as a pressure relief hole, which is directly connected to the atmosphere and the inside of the barrel. When non-hazardous liquid is injected, the pressure can be effectively balanced to further improve the stability and accuracy of the injection.

[0026] In this embodiment, when the screw extruder product does not need oil injection when switching, the injection hole 201 on the boss 2 is not connected to the injection valve and the pressure monitoring hole 203 is not connected to the hose. The injection cover can realize the exhaust function, and the design of the boss 2 can effectively prevent water vapor and oil from flowing into the screw barrel to affect the product quality. At the same time, it will not cause the material to block the injection hole 201. The injection cover has a simple structure, strong versatility, and is easy to use.

[0027] In this embodiment, the injection hole 201 has an internal thread, and the injection valve is sealedly connected to the injection hole 201 through a threaded connection. The structure is simple, and the injection valve is easy to install and disassemble.

[0028] Furthermore, the groove 10 has a first groove side surface 101 and a second groove side surface 102 which are inclined, and the angles between the first groove side surface 101, the second groove side surface 102 and the groove bottom surface are all greater than 90°. The first groove side surface 101 is adjacent to the second groove side surface 102. In actual applications, one of the first groove side surface 101 and the second groove side surface 102 faces the material flow direction, and the other faces the screw rotation direction. When the melt passes through the area toward which the injection liquid cover is directed, the injected liquid can be continuously brought into the melt along the first groove side surface 101 and the second groove side surface 102 to avoid liquid retention. At the same time, since the first groove side surface 101 and the second groove side surface 102 have a slope, the expanded melt hanging on the wall can be smoothly pulled back into the screw, effectively preventing melt accumulation and clogging of the injection hole 201.

[0029] Furthermore, the injection liquid cover also includes a nano anti-stick coating, and the first groove side 101 and the second groove side 102 are both provided with the nano anti-stick coating, which can prevent the melt from sticking to the first groove side 101 and the second groove side 102, and can more effectively prevent the melt from accumulating and clogging the injection hole 201. Specifically, the nano anti-stick coating has high temperature resistance.

[0030] Furthermore, the groove side surfaces of the groove 10 and the groove side surfaces and the groove bottom surface are connected by rounded corner transitions, and the rounded corner transition structure can also effectively avoid melt accumulation.

[0031] In this embodiment, the outer peripheral side of the cover body 1 also has a mounting flange, which is arranged around the groove 10, one side of the mounting flange is flush with the side where the boss 2 in the cover body 1 is located, and the mounting flange has a mounting through hole, and the cover body 1 is fixedly connected to the screw barrel by screws. Preferably, the side of the mounting flange facing away from the boss 2 is a smooth surface in contact with the screw barrel, and the roughness is reduced by grinding, which can strengthen the seal between the injection liquid cover and the screw barrel.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An injection-molded cap, suitable for a screw extruder, characterized in that: The invention comprises a cover body (1) and a boss (2), wherein the boss (2) is arranged on the top of the cover body (1), a groove (10) is arranged at the bottom of the cover body (1), and a liquid injection hole (201) is arranged at the top of the boss (2), and the liquid injection hole (201) is connected to the groove (10).

2. The injection cap according to claim 1, characterized in that: The boss (2) has an inner cavity (202), the inner cavity (202) has an opening, the opening is located on the bottom surface of the groove (10), and the injection hole (201) passes through the top of the boss (2) to the inner cavity (202).

3. The injection cap according to claim 2, characterized in that: A pressure monitoring hole (203) is also provided on the top of the boss (2), and the pressure monitoring hole (203) is connected to the inner cavity (202).

4. The injection cap according to claim 1, characterized in that: The liquid injection hole (201) has an internal thread.

5. The injection cap according to claim 1, characterized in that: The groove (10) comprises a first groove side surface (101) and a second groove side surface (102) which are arranged obliquely, wherein the angles between the first groove side surface (101), the second groove side surface (102) and the groove bottom surface are all greater than 90°, and the first groove side surface (101) and the second groove side surface (102) are adjacent to each other.

6. The injection cap according to claim 5, characterized in that: It also includes a nano anti-stick coating, and the nano anti-stick coating is provided on the first groove side (101) and the second groove side (102).

7. The injection cap according to claim 1, characterized in that: The groove side surfaces of the groove (10) and the groove side surfaces and the groove bottom surface are connected through rounded corner transitions.

8. A screw extruder, characterized in that: It comprises a screw barrel, a liquid injection valve and a liquid injection cover as described in any one of claims 1 to 7, wherein the liquid injection cover is connected to the screw barrel, and the liquid injection valve is sealedly connected to the liquid injection hole.

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