Screw structure for extruding pipes

Abstract

The utility model discloses a screw rod structure for extruding a pipe. The screw rod structure comprises a main shaft, a plurality of thread bushings and a plurality of locking pieces, the main shaft comprises a transmission part and a connecting part, one end of the transmission part is coaxially and fixedly connected with one end of the connecting part, threads capable of extruding pipes are arranged on the periphery of the threaded sleeves, the connecting part is sleeved with the threaded sleeves, the threaded sleeves are slidably connected with the connecting part, and in any two adjacent threaded sleeves, the end face of one threaded sleeve is attached to the end face of the other threaded sleeve. A first supporting surface facing the threaded sleeve is arranged between the transmission part and the connecting part; the locking piece is in threaded connection with the end, away from the transmission part, of the connecting part so that the threaded sleeve can be tightly pressed on the first supporting face. The utility model provides a screw rod structure which comprises a plurality of thread bushings spliced together, part of threads of the screw rod structure can be changed by replacing the thread bushings, and the use cost of an extruder is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe extruders, in particular to a screw structure used for extruding pipes. Background Art

[0002] The screw structure is the main component of the pipe extruder. The existing screw structure refers to the patent application number CN2019206805943, which includes a main shaft and a thread fixedly connected to the outer periphery of the main shaft. According to different functions, the screw is divided into multiple rod sections, including a feeding section, a compression section, a vacuum section, and an extrusion section. The threads of each rod section are different. The existing screw structure is an integrated molding structure. When the thread of one of the rod sections needs to be adjusted, the entire screw structure can only be replaced, which undoubtedly increases the use cost of the extruder. Utility Model Content

[0003] In order to solve the shortcoming of the existing screw structure that the thread of one of the rod sections cannot be changed separately, the utility model proposes a screw structure, including a plurality of thread sleeves spliced ​​together, and the thread of part of the screw structure can be changed by replacing the thread sleeves, thereby reducing the use cost of the extruder.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A screw structure for extruding pipes, comprising: a main shaft and a plurality of threaded sleeves and a locking piece; the main shaft comprises a transmission part and a connecting part, one end of the transmission part is coaxially fixedly connected with one end of the connecting part, the outer periphery of the threaded sleeve is provided with threads for extruding pipes, a plurality of threaded sleeves are arranged on the connecting part and are slidably connected with the connecting part, in any two adjacent threaded sleeves, the end face of the threaded sleeve is fitted with the end face of the other threaded sleeve, and a first supporting surface facing the threaded sleeve is arranged between the transmission part and the connecting part; the locking piece is threadedly connected to one end of the connecting part away from the transmission part to press the threaded sleeve against the first supporting surface.

[0006] Through the above arrangement, firstly, the thread of the screw structure part can be changed by replacing the threaded sleeve; secondly, it is convenient to replace the threaded sleeve; thirdly, it can reduce the raw material entering the threaded sleeve and prevent the threaded sleeve from sticking to the connection part.

[0007] Furthermore, the end face of the threaded sleeve is provided with a sealing protrusion and a sealing groove, both of which are annular around the axis of the threaded sleeve, the sealing protrusion is adapted to the sealing groove, and the sealing protrusion of the threaded sleeve is embedded in the sealing groove of the adjacent threaded sleeve.

[0008] Through the above arrangement, the contact area between the threaded sleeves can be increased, thereby further improving the sealing performance between the threaded sleeves.

[0009] Furthermore, a threaded hole is coaxially arranged at one end of the connecting part away from the transmission part, and the locking piece is threadedly connected in the threaded hole, and the maximum outer diameter of the locking piece is less than or equal to the outer diameter of one end of the connecting part close to the locking piece; a second supporting surface facing the threaded sleeve is arranged on the locking piece, and the second supporting surface is in contact with the threaded sleeve.

[0010] Through the above arrangement, firstly, the locking member can lock the threaded sleeve on the connecting portion through the second supporting surface; secondly, the locking member will not affect the forming of the pipe.

[0011] Furthermore, the cross section of the connecting portion is a regular polygon.

[0012] The above arrangement prevents the threaded sleeve and the connecting portion from rotating relative to each other.

[0013] Furthermore, at least four threaded sleeves are provided, the threaded sleeve closest to the first supporting surface is a feed threaded sleeve, the thickness H of the thread of the feed threaded sleeve is less than or equal to 4 mm, and the pitch D of the thread of the feed threaded sleeve is greater than or equal to 12 mm.

[0014] Through the above arrangement, the material feeding stability of the screw structure can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the screw structure of the embodiment.

[0016] Figure 2 2 is a cross-sectional view of the screw structure of the embodiment.

[0017] Figure 3 for Figure 2 AA section view.

[0018] Figure 4 for Figure 2 Enlarged view of point B.

[0019] Figure 5 for Figure 2 Enlarged view of point C. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0021] See also Figures 1 to 5A screw structure for extruding pipes, comprising: a main shaft 3, a plurality of threaded sleeves 4 and a locking member 5; the main shaft 3 comprises a transmission part 31 and a connecting part 32, one end of the transmission part 31 is coaxially fixedly connected with one end of the connecting part 32, the outer periphery of the threaded sleeve 4 is provided with a thread 41 for extruding pipes, a plurality of threaded sleeves 4 are sleeved on the connecting part 32 and are slidably connected with the connecting part 32, in any two adjacent threaded sleeves 4, the end face of the threaded sleeve 4 is fitted with the end face of the other threaded sleeve 4, and a first supporting surface 311 facing the threaded sleeve 4 is provided between the transmission part 31 and the connecting part 32; the locking member 5 is threadedly connected to one end of the connecting part 32 away from the transmission part 31 to press the threaded sleeve 4 against the first supporting surface 311.

[0022] Through the above arrangement, first, the thread 41 of the screw structure part can be changed by replacing the threaded sleeve 4; second, it is convenient to replace the threaded sleeve 4; third, it can reduce the raw material entering the threaded sleeve 4 and prevent the threaded sleeve 4 from adhering to the connecting portion 32.

[0023] In the present application, the main shaft 3 is an integrally formed structure, and the threads 41 of each threaded sleeve 4 are different according to the corresponding functional requirement parameters; the locking member 5 can be a bolt. After the locking member 5 is tightened, the locking member 5 and the first supporting surface 311 lock all the threaded sleeves 4 on the connecting part 32. When the extruder is running, the power mechanism of the extruder drives all the threaded sleeves 4 to rotate through the transmission part 31 and the connecting part 32 to extrude the raw materials. The end faces of two adjacent threaded sleeves 4 fit tightly together to ensure good sealing and prevent raw materials from entering between the threaded sleeves 4 and the connecting portion 32 through the gap between the threaded sleeves 4, thereby preventing the threaded sleeves 4 from adhering to the connecting portion 32; when it is necessary to change the thread 41 on one of the threaded sleeves 4, the locking piece 5 is removed from the connecting portion 32, and the threaded sleeve 4 can slide outward along the axial direction of the connecting portion 32. After the threaded sleeve 4 is slid out of the connecting portion 32, the threaded sleeve 4 with the corresponding thread 41 is replaced, and after the threaded sleeve 4 is re-sheathed on the connecting portion 32, the locking piece 5 is re-tightened on the connecting portion 32 without the need to replace the entire screw structure.

[0024] As an implementation method, the end face of the threaded sleeve 4 is provided with a sealing protrusion 42 and a sealing groove 43, both of which are annular around the axis of the threaded sleeve 4, the sealing protrusion 42 is adapted to the sealing groove 43, and the sealing protrusion 42 of the threaded sleeve 4 is embedded in the sealing groove 43 of the adjacent threaded sleeve 4.

[0025] Through the above arrangement, the contact area between the threaded sleeves can be increased, thereby further improving the sealing performance between the threaded sleeves.

[0026] As an implementation method, a threaded hole 321 is coaxially arranged at one end of the connecting portion 32 away from the transmission portion 31, and the locking member 5 is threadedly connected to the threaded hole 321, and the maximum outer diameter of the locking member 5 is less than or equal to the outer diameter of one end of the connecting portion 32 close to the locking member 5; a second supporting surface 51 facing the threaded sleeve 4 is arranged on the locking member 5, and the second supporting surface 51 is in contact with the threaded sleeve 4.

[0027] Through the above arrangement, firstly, the locking member 5 can lock the threaded sleeve 4 on the connecting portion 32 through the second supporting surface 51; secondly, the locking member 5 will not affect the forming of the pipe.

[0028] As an implementation manner, the cross section of the connecting portion 32 is a regular polygon.

[0029] The above arrangement prevents the threaded sleeve 4 and the connecting portion 32 from rotating relative to each other.

[0030] In the present application, the inner wall of the threaded sleeve 4 is adapted to the connecting portion 32. When the threaded sleeve 4 is sleeved on the connecting portion 32, the inner wall of the threaded sleeve 4 fits with the outer surface of the connecting portion 32. When the connecting portion 32 rotates, the threaded sleeve 4 can be driven to rotate synchronously.

[0031] As an implementation method, at least four threaded sleeves 4 are provided, the threaded sleeve 4 closest to the first supporting surface 311 is the feed threaded sleeve 4, the thickness H of the thread 41 of the feed threaded sleeve 4 is less than or equal to 4 mm, and the pitch D of the thread 41 of the feed threaded sleeve 4 is greater than or equal to 12 mm.

[0032] Through the above arrangement, the material feeding stability of the screw structure can be improved.

[0033] In the present application, the raw material is input from the feed screw sleeve 4. When the thickness of the thread 41 of the feed screw sleeve 4 is small and the pitch is large, it is convenient for the screw structure to feed the material.

[0034] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the utility model.

Claims

1. A screw structure for extruding a pipe, characterized in that: include: A main shaft and a plurality of threaded sleeves, wherein the main shaft comprises a transmission part and a connection part, one end of the transmission part is coaxially fixedly connected with one end of the connection part, a thread capable of extruding a pipe is arranged on the outer periphery of the threaded sleeve, a plurality of threaded sleeves are arranged on the connection part and are slidably connected with the connection part, and an end face of the threaded sleeve of any two adjacent threaded sleeves is fitted with an end face of another threaded sleeve, and a first supporting surface facing the threaded sleeve is arranged between the transmission part and the connection part; A locking member is threadedly connected to an end of the connecting portion away from the transmission portion to press the threaded sleeve onto the first supporting surface.

2. A screw structure for extruding a pipe according to claim 1, characterized in that: The end surface of the threaded sleeve is provided with a sealing protrusion and a sealing groove, both of which are annular around the axis of the threaded sleeve, the sealing protrusion is adapted to the sealing groove, and the sealing protrusion of the threaded sleeve is embedded in the sealing groove of the adjacent threaded sleeve.

3. A screw structure for extruding a pipe according to claim 2, characterized in that: A threaded hole is coaxially arranged at one end of the connecting portion away from the transmission portion, the locking piece is threadedly connected in the threaded hole, and the maximum outer diameter of the locking piece is less than or equal to the outer diameter of one end of the connecting portion close to the locking piece; a second supporting surface facing the threaded sleeve is arranged on the locking piece, and the second supporting surface is in contact with the threaded sleeve.

4. A screw structure for extruding a pipe according to claim 1, characterized in that: The cross section of the connecting portion is a regular polygon.

5. A screw structure for extruding a pipe according to claim 1, characterized in that: At least four threaded sleeves are provided, and the threaded sleeve closest to the first supporting surface is a feed threaded sleeve, the thread thickness H of the feed threaded sleeve is less than or equal to 4 mm, and the thread pitch D of the feed threaded sleeve is greater than or equal to 12 mm.

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