Variable mold

Abstract

A variable mold comprises a mouth mold and a core mold, the mouth mold is arranged on the periphery of the core mold in a sleeving mode, the mouth mold comprises a first mold body and a second mold body which are movably connected, a forming channel used for forming a pipe is formed between the second mold body and the core mold, when the second mold body moves in the first direction, the width of the forming channel is decreased, and when the second mold body moves in the second direction, the width of the forming channel is decreased. The width of the forming channel is increased; a threaded connection part is arranged between the first mold body and the second mold body, and the first mold body and the second mold body are detachably and movably connected through the threaded connection part. The mouth die comprises the first die body and the second die body which are movably connected, when the second die body moves towards the first direction, the width of the forming channel is reduced, a pipe with the thin wall thickness can be produced, when the second die body moves towards the second direction, the width of the forming channel is increased, and a pipe with the thick wall thickness can be produced. Therefore, one set of die can produce pipes with different wall thicknesses, the number of mouth dies and core dies can be reduced, the die cost is reduced, and production, management and maintenance are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a variable mold. Background Art

[0002] Plastic pipe production usually adopts extrusion molding process, in which the plastic raw material is melted and plasticized into a melt by an extruder, and then forms a uniform and stable material flow through the mold body, passes through the annular gap formed by the mouth mold and the core mold, and then is cooled and shaped to obtain the finished plastic pipe. In pipe molds, it is common to use the mouth mold and the core mold in combination. Mouth molds with different outer diameters are matched with core molds with different outer diameters to achieve the production of different pipe wall thickness requirements. In this case, a large number of mouth molds and core molds of different specifications will be required due to the different wall thickness of the pipe, which makes the mold cost high, the mold management and maintenance difficult, and there is a lot of processing waste.

[0003] Therefore, further improvements are necessary. Utility Model Content

[0004] The purpose of the utility model is to provide a variable mold with simple and reasonable structure, low cost, convenient management and maintenance, high versatility and strong practicality, so as to overcome the shortcomings of the prior art.

[0005] A variable mold designed for this purpose includes a mouth mold and a core mold, the mouth mold is sleeved on the outer circumference of the core mold, and is characterized in that: the mouth mold includes a first mold body and a second mold body that are movably connected, and a molding channel for molding pipes is arranged between the second mold body and the core mold, when the second mold body moves in the first direction, the width of the molding channel becomes smaller, and when the second mold body moves in the second direction, the width of the molding channel becomes larger.

[0006] A threaded connection portion is provided between the first mold body and the second mold body, and the first mold body and the second mold body are detachably connected via the threaded connection portion.

[0007] A first limiting surface is provided on one side of the first mold body, and a second limiting surface is provided on the second mold body. When the second mold body moves in the second direction, it is limited on the first limiting surface of the first mold body by the second limiting surface.

[0008] An angle a is formed between the molding channel and the moving path of the second mold body.

[0009] The first mold body is provided with a plug-in hole, one end of the second mold body is provided with a plug-in portion, the plug-in portion and the plug-in hole are plugged into each other, and the threaded connection portion is provided between the plug-in portion and the plug-in hole.

[0010] The core mold comprises a first core rod and a second core rod detachably connected to each other, and the molding channel is arranged between the second core rod and the second mold body.

[0011] A first inclined surface is arranged inside the second mold body, a second inclined surface is arranged outside the second core rod, the length of the second inclined surface is greater than the length of the first inclined surface, and a molding channel is formed between the first inclined surface and the second inclined surface.

[0012] The first core rod is provided with a first fixing hole, the second core rod is provided with a second fixing hole, and fasteners are provided on the first fixing hole and the second fixing hole to connect the first core rod and the second core rod.

[0013] A feeding channel is arranged between the mouth die and the core die, and the feeding channel is connected with the molding channel.

[0014] The threaded connection part comprises an external thread arranged on the plug-in part and an internal thread arranged on the plug-in hole, and the external thread and the internal thread cooperate with each other.

[0015] The mouth die of the utility model comprises a first die body and a second die body which are movably connected. When the second die body moves in a first direction, the width of the molding channel becomes smaller, and a thinner-walled pipe can be produced. When the second die body moves in a second direction, the width of the molding channel becomes larger, and a thicker-walled pipe can be produced. Therefore, a set of molds can produce pipes with different wall thicknesses, which can reduce the number of mouth dies and core molds, reduce mold costs, facilitate production management and maintenance, and avoid a large amount of processing waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the mold in one embodiment of the utility model.

[0017] Figure 2 It is a schematic diagram of the overall structure of another aspect of the mold in one embodiment of the utility model.

[0018] Figure 3 It is a cross-sectional view of the mold after the second mold body moves to the second direction in one embodiment of the utility model.

[0019] Figure 4 It is a cross-sectional view of the mold after the second mold body moves toward the first direction in one embodiment of the utility model.

[0020] Figure 5 It is a schematic diagram of the exploded structure of the mold in one embodiment of the utility model. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] See also Figure 1-Figure 5The variable mold includes a mouth mold 1 and a core mold 2. The mouth mold 1 is mounted on the outer periphery of the core mold 2. The mouth mold 1 includes a first mold body 3 and a second mold body 4 that are movably connected. A molding channel 5 for molding the pipe is arranged between the second mold body 4 and the core mold 2. When the second mold body 4 moves in the first direction A, the width of the molding channel 5 becomes smaller. When the second mold body 4 moves in the second direction B, the width of the molding channel 5 becomes larger.

[0023] A threaded connection portion is provided between the first mold body 3 and the second mold body 4 , and the first mold body 3 and the second mold body 4 are detachably connected via the threaded connection portion.

[0024] A first limiting surface 6 is provided on one side of the first mold body 3, and a second limiting surface 7 is provided on the second mold body 4. When the second mold body 4 moves in the second direction B, it is limited on the first limiting surface 6 of the first mold body 3 by the second limiting surface 7; when it is required to produce a pipe with a thicker wall thickness, the first limiting surface 6 and the second limiting surface 7 are in contact (such as Figure 3 As shown in FIG. 1 ), the wall thickness of the produced pipe will be thicker. When it is required to produce a thinner wall pipe, when the second mold body 4 is loosened, the first limit surface 6 and the second limit surface 7 are away from each other (as shown in FIG. 1 ). Figure 4 As shown), the wall thickness of the produced pipe will be thinner.

[0025] An angle a is formed between the molding channel 5 and the moving path of the second mold body 4 , so that when the second mold body 4 moves, the width of the molding channel 5 changes.

[0026] The first mold body 3 is provided with an inserting hole 8 , and one end of the second mold body 4 is provided with an inserting portion 9 . The inserting portion 9 and the inserting hole 8 are plugged into each other, and a threaded connection portion is provided between the inserting portion 9 and the inserting hole 8 .

[0027] The core mold 2 includes a first core rod 10 and a second core rod 11 detachably connected to each other, and the molding channel 5 is arranged between the second core rod 11 and the second mold body 4 .

[0028] A first inclined surface 12 is provided on the inner side of the second mold body 4, and a second inclined surface 13 is provided on the outer side of the second core rod 11. The length of the second inclined surface 13 is greater than the length of the first inclined surface 12. A molding channel 5 is formed between the first inclined surface 12 and the second inclined surface 13, so that an angle a is formed between the molding channel 5 and the moving path of the second mold body 4.

[0029] A first fixing hole 14 is provided on the first core rod 10, and a second fixing hole 15 is provided on the second core rod 11. Fasteners are provided on the first fixing hole 14 and the second fixing hole 15 to connect the first core rod 10 and the second core rod 11. The first fixing hole 14 is a hexagonal hole, the second fixing hole 15 is a threaded hole, and the fastener is a hexagonal bolt.

[0030] A feed channel 16 is provided between the die 1 and the core die 2 . The feed channel 16 is connected to the molding channel 5 . The plastic melt reaches the molding channel 5 through the feed channel 16 .

[0031] The threaded connection portion includes an external thread 17 arranged on the plug-in portion 9 and an internal thread 18 arranged on the plug-in hole 8. The external thread 17 and the internal thread 18 cooperate with each other to realize a detachable and movable connection between the first mold body 3 and the second mold body 4. The second mold body 4 can be moved by rotating the second mold body 4 through the thread; the mouth mold 1 and the core mold 2 are both detachable by thread connection, which is convenient for interchangeable adjustment and use for different pipe diameters and different wall thicknesses, reducing the number of mouth molds 1 and core molds 2, and facilitating production and maintenance.

[0032] The above is a preferred embodiment of the utility model, which 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. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A variable mold, comprising a mouth mold (1) and a core mold (2), wherein the mouth mold (1) is sleeved on the outer periphery of the core mold (2), characterized in that: The die (1) comprises a first die body (3) and a second die body (4) which are movably connected. A forming channel (5) for forming a pipe is provided between the second die body (4) and the core die (2). When the second die body (4) moves in a first direction (A), the width of the forming channel (5) decreases. When the second die body (4) moves in a second direction (B), the width of the forming channel (5) increases.

2. The variable mold according to claim 1, characterized in that: A threaded connection portion is provided between the first mold body (3) and the second mold body (4), and the first mold body (3) and the second mold body (4) are detachably connected via the threaded connection portion.

3. The variable mold according to claim 2, characterized in that: A first limiting surface (6) is provided on one side of the first mold body (3), and a second limiting surface (7) is provided on the second mold body (4); when the second mold body (4) moves in the second direction (B), it is limited on the first limiting surface (6) of the first mold body (3) by the second limiting surface (7).

4. The variable mold according to claim 3, characterized in that: An included angle a is formed between the molding channel (5) and the moving path of the second mold body (4).

5. The variable mold according to claim 2, characterized in that: The first mold body (3) is provided with a plug hole (8), one end of the second mold body (4) is provided with a plug portion (9), the plug portion (9) and the plug hole (8) are plugged into each other, and the threaded connection portion is provided between the plug portion (9) and the plug hole (8).

6. The variable mold according to claim 1, characterized in that: The core mold (2) comprises a first core rod (10) and a second core rod (11) which are detachably connected to each other, and the molding channel (5) is arranged between the second core rod (11) and the second mold body (4).

7. The variable mold according to claim 6, characterized in that: A first inclined surface (12) is provided on the inner side of the second mold body (4), a second inclined surface (13) is provided on the outer side of the second core rod (11), the length of the second inclined surface (13) is greater than the length of the first inclined surface (12), and a molding channel (5) is formed between the first inclined surface (12) and the second inclined surface (13).

8. The variable mold according to claim 7, characterized in that: The first core rod (10) is provided with a first fixing hole (14), the second core rod (11) is provided with a second fixing hole (15), and fasteners are provided on the first fixing hole (14) and the second fixing hole (15) to connect the first core rod (10) and the second core rod (11).

9. The variable mold according to claim 1, characterized in that: A feed channel (16) is provided between the mouth die (1) and the core die (2), and the feed channel (16) is connected to the molding channel (5).

10. The variable mold according to claim 5, characterized in that: The threaded connection portion comprises an external thread (17) provided on the plug-in portion (9) and an internal thread (18) provided on the plug-in hole (8), and the external thread (17) and the internal thread (18) cooperate with each other.

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