Extrusion die capable of rapidly replacing die core

Abstract

The utility model relates to the technical field of extrusion dies, in particular to an extrusion die capable of quickly replacing a die core, which comprises a mouth die and a die core body arranged in the mouth die, the die core body comprises a connecting section and a straight section, the die core is divided into the connecting section and the straight section, the straight section is detachably arranged at the end part of the connecting section, and the straight section is detachably arranged at the end part of the connecting section. When the wall thickness of an extruded pipe needs to be adjusted, only the straight section needs to be detached and replaced, the mouth mold and the whole mold core do not need to be detached, the connecting section is not detached and does not need to be preheated, the preheating time is saved, the straight section and the connecting section are coaxially arranged, concentricity does not need to be adjusted after installation, and the cost is reduced. The installation and debugging time is greatly shortened, and the technical problems that in the prior art, the operation of replacing the mold core is tedious, the potential safety hazard is high, and the replacement and debugging time is long are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of extrusion dies, and more particularly to an extrusion die with a fast-changing die core. Background Art

[0002] Currently, the production of various PVC-U drainage pipe types requires different extrusion dies. Due to the increasing number of pipe specifications, different pipes correspond to different dies. The actual production process requires producing different products, necessitating multiple die changes. Currently, switching specifications for pipes of the same diameter requires stopping the machine, disassembling the die, and replacing the core. The core is locked using a screw and nut. This method of mold installation makes adjusting wall thickness difficult, lengthy die changes, and produces a high volume of scrap.

[0003] For example, the prior art discloses a die core rod for stable glue extrusion, which includes a die body and a core rod mechanism. The die body is provided with a core rod mechanism inside, and the core rod mechanism includes a first rod body, a second rod body, a third rod body, and a fourth rod body. The first rod body is fixed to the second rod body, the third rod body, and the fourth rod body in sequence. When the die body and the core rod mechanism are installed with the equipment, the screw thread is docked with the die head at the blanking end of the machine to install the die body and the core rod mechanism with the equipment. In this solution, when the wall thickness of the extruded pipe needs to be adjusted, it is necessary to first stop the machine and disassemble the die, and then completely unscrew the screw thread at the end of the core rod mechanism to complete the disassembly of the die core.

[0004] However, the existing technology adopts the method of replacing the mold core as a whole, which is not only cumbersome to operate, but also takes a long time to replace. It also requires a crane to lift the mouth mold, which poses a safety hazard. The replaced mold core needs to be reheated, which delays a lot of production time. After replacement, the concentricity needs to be readjusted, resulting in a large amount of debugging waste. Because the existing technology has the technical problems of cumbersome operation of replacing the mold core, high safety risks and long replacement and debugging time. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art in that the operation of replacing the mold core is cumbersome, there are high safety risks and the replacement and debugging time is long, and to provide an extrusion mold with a quick mold core replacement.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] An extrusion die with a quick-change die core comprises a die and a die core body arranged in the die, the die core body comprising a connecting section and a straight section, the straight section being detachably arranged at the end of the connecting section, a compression channel being formed between the outer wall of the connecting section and the inner wall of the die, an extrusion channel being formed between the outer wall of the straight section and the inner wall of the die, the compression channel being connected to the extrusion channel, the cross-sectional area of the compression channel gradually decreasing from one end of the connecting section away from the straight section to one end of the extrusion channel, and the cross-sectional area of the extrusion channel being the same at any position.

[0008] The utility model provides an extrusion die with a quick-replacement die core. Since the cross-sectional area of the compression channel gradually decreases from the end of the connecting section away from the straight section to the end of the extrusion channel, the molten material is continuously compressed during the flow in the compression channel, and the cross-sectional area of the extrusion channel at any position is the same. The molten material is extruded after being formed in the extrusion channel. Therefore, it is only necessary to change the cross-sectional area of the extrusion channel by changing the outer diameter of the straight section to achieve the effect of adjusting the wall thickness of the extruded pipe. The straight section is detachably arranged at the end of the connecting section in the present application. When the wall thickness of the extruded pipe needs to be adjusted, it is only necessary to disassemble and replace the straight section. There is no need to disassemble the die and the entire die core. The connecting section does not need to be disassembled and preheated, which saves preheating time. In addition, the straight section and the connecting section are coaxially arranged, and there is no need to adjust the concentricity after installation, which greatly shortens the installation and debugging time, and effectively solves the technical problems of cumbersome operation of replacing the die core, high safety hazards and long replacement and debugging time in the prior art.

[0009] Furthermore, a connecting platform is coaxially provided on one end of the straight section near the connecting section, the outer wall of the connecting platform being provided with external threads, and a connecting groove is coaxially provided on one end of the connecting section near the straight section, the inner wall of the connecting groove being provided with internal threads, and the connecting platform is threadedly connected to the connecting groove. Threading the connecting platform into the connecting groove enables a detachable connection between the straight section and the connecting section.

[0010] Furthermore, a first inner hexagonal square hole is coaxially provided at one end of the straight section away from the connecting section. The provision of the first inner hexagonal square hole facilitates the use of tools to rotate the straight section, facilitating labor-saving disassembly and installation.

[0011] Furthermore, a coaxial stopper is provided between the connecting platform and the straight section, the diameter of which is greater than the diameter of the connecting platform and smaller than the outer diameter of the straight section. A coaxial stopper is provided at one end of the connecting section adjacent to the straight section, and the stopper can be engaged within the stopper. Because the stopper is coaxially provided between the connecting platform and the straight section, and its diameter is greater than the diameter of the connecting platform and smaller than the outer diameter of the straight section, the stopper engages with the stopper to facilitate coaxial positioning.

[0012] Furthermore, a second inner hexagonal square hole is coaxially provided in the connecting section, and the second inner hexagonal square hole is provided at the bottom of the limiting groove. The second inner hexagonal square hole is provided at the bottom of the limiting groove, so that one hole can serve two purposes.

[0013] Furthermore, the end of the connecting section away from the straight section is detachably connected to the fixed mold core, and the mouth die is detachably mounted on the compression mold. A compression cavity is formed between the inner wall of the compression mold and the outer wall of the fixed mold core, and the compression cavity is connected to the compression channel. The mouth die is detachably mounted on the compression mold, and the connecting section is detachably mounted on the fixed mold core. A compression cavity is formed between the inner wall of the compression mold and the outer wall of the fixed mold core, and the molten material is pre-compressed in the compression cavity before entering the compression channel.

[0014] Furthermore, a fixing platform is coaxially protruded on one end of the connecting section near the fixed mold core, the outer wall of the fixing platform being provided with external threads, a fixing groove is coaxially recessed on the end of the fixed mold core, the inner wall of the fixing groove being provided with internal threads, and the fixing platform is threadedly connected to the fixing groove. Threading the fixing platform into the fixing groove enables a detachable connection between the connecting section and the fixed mold core.

[0015] Furthermore, a locking platform is coaxially provided at one end of the die, wherein the outer diameter of the locking platform is larger than the outer diameter of the die, a locking groove is coaxially provided at the end of the compression die, and the locking platform can be engaged with the locking groove, and a locking pressure plate is removably provided at the end of the compression die, wherein the locking pressure plate is sleeved on the outer wall of the die, and the inner diameter of the locking pressure plate is smaller than the inner diameter of the locking platform. Since the locking pressure plate can be sleeved on the outer wall of the die, after the locking platform is engaged in the locking groove, the locking pressure plate is then sleeved on the die and covers the end of the compression die. Since the inner diameter of the locking pressure plate is smaller than the inner diameter of the locking platform, the locking pressure plate will restrict the locking platform, thereby limiting and fixing the die and the compression die.

[0016] Furthermore, the locking plate is provided with a plurality of mounting holes, and the compression mold is provided with threaded holes at positions corresponding to the plurality of mounting holes. Bolts are passed through the mounting holes and threadedly connected into the threaded holes to abut the locking plate against the compression mold. The bolts are passed through the mounting holes and threadedly connected into the threaded holes to achieve a detachable connection between the locking plate and the compression mold.

[0017] Furthermore, the straight section and the connecting section are coaxially provided with a communicating vent hole. The coaxially provided communicating vent holes in the straight section and the connecting section play an inflation support effect on the extruded tube to prevent the tube from shrinking.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The utility model splits the die core into a connecting section and a straight section, and the straight section is detachably arranged at the end of the connecting section. When the wall thickness of the extruded pipe needs to be adjusted, it is only necessary to disassemble and replace the straight section without disassembling the die and the entire die core. The connecting section does not need to be preheated if it is not disassembled, which saves preheating time. In addition, the straight section and the connecting section are coaxially arranged, and there is no need to adjust the concentricity after installation, which greatly shortens the installation and debugging time. It effectively solves the technical problems of cumbersome operation of replacing the die core, high safety hazards and long replacement and debugging time in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of an extrusion die with a quick core replacement according to Example 1;

[0021] Figure 2 Schematic diagram of the assembly of the connecting section and the straight section;

[0022] Figure 3 This is a schematic structural diagram of an extrusion die with a quick core replacement according to Example 3.

[0023] In the accompanying drawings: 1. Mouth die; 11. Locking platform; 2. Connecting section; 21. Connecting groove; 22. Limiting groove; 23. Second inner hexagonal square hole; 24. Fixing platform; 3. Straight section; 31. Connecting platform; 32. First inner hexagonal square hole; 33. Limiting platform; 4. Compression channel; 5. Extrusion channel; 6. Fixed core; 61. Fixed groove; 7. Compression die; 71. Locking groove; 8. Compression chamber; 9. Locking pressure plate; 91. Mounting hole; 10. Exhaust hole. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0025] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] Example 1

[0027] like Figures 1 to 2 The figure shows the first embodiment of an extrusion die with a quick core replacement according to the present invention.

[0028] An extrusion die for quickly changing a die core comprises a die 1 and a die core body disposed in the die 1, the die core body comprising a connecting section 2 and a straight section 3, the straight section 3 being detachably disposed at the end of the connecting section 2, a compression channel 4 being formed between the outer wall of the connecting section 2 and the inner wall of the die 1, an extrusion channel 5 being formed between the outer wall of the straight section 3 and the inner wall of the die 1, the compression channel 4 being connected to the extrusion channel 5, the cross-sectional area of the compression channel 4 gradually decreasing from the end of the connecting section 2 away from the straight section 3 to the end of the extrusion channel 5, and the cross-sectional area of the extrusion channel 5 being the same at any position. A connecting platform 31 is coaxially convexly provided at one end of the straight section 3 close to the connecting section 2, the outer wall of the connecting platform 31 being provided with an external thread, a connecting groove 21 is coaxially concavely provided at one end of the connecting section 2 close to the straight section 3, the inner wall of the connecting groove 21 being provided with an internal thread, and the connecting platform 31 is threadedly connected to the connecting groove 21. A first inner hexagonal square hole 32 is coaxially provided at one end of the straight section 3 away from the connecting section 2. The straight section 3 and the connecting section 2 are coaxially provided with a communicating exhaust hole 10 .

[0029] In this embodiment, if Figure 1As shown, since the cross-sectional area of the compression channel 4 gradually decreases from the end of the connecting section 2 away from the straight section 3 to the end of the extrusion channel 5, the molten material is continuously compressed during the flow in the compression channel 4, and the cross-sectional area of the extrusion channel 5 at any position is the same. The molten material is extruded after being formed in the extrusion channel 5. Therefore, it is only necessary to change the cross-sectional area of the extrusion channel 5 by changing the outer diameter of the straight section 3 to adjust the wall thickness of the extruded pipe. In this application, the straight section 3 is detachably arranged at the end of the connecting section 2. When the wall thickness of the extruded pipe needs to be adjusted, it is only necessary to disassemble and replace the straight section 3. There is no need to disassemble the die 1 and the entire mold core. The connecting section 2 does not need to be disassembled and preheated, which saves preheating time. In addition, the straight section 3 and the connecting section 2 are coaxially arranged, and there is no need to adjust the concentricity after installation, which greatly shortens the installation and debugging time, and effectively solves the technical problems of cumbersome operation of replacing the mold core, high safety hazards and long replacement and debugging time in the prior art.

[0030] In this embodiment, if Figure 2 As shown, the connecting platform 31 is threadedly connected to the connecting groove 21 to achieve a detachable connection between the straight section 3 and the connecting section 2.

[0031] In this embodiment, if Figure 1 As shown, the first hexagonal square hole 32 is provided to facilitate the use of tools to rotate the straight section 3, which is convenient for labor-saving disassembly and installation.

[0032] In this embodiment, if Figure 1 As shown, the straight section 3 and the connecting section 2 are coaxially provided with a communicating vent hole 10, which provides an inflation support effect on the extruded tube and prevents the tube from shrinking.

[0033] Example 2

[0034] like Figure 2 The figure shows a second embodiment of an extrusion die with a quick core replacement according to the present invention.

[0035] This embodiment is similar to the first embodiment, except that a coaxial stopper 33 is provided between the connecting platform 31 and the straight section 3. The diameter of the stopper 33 is larger than the diameter of the connecting platform 31 and smaller than the outer diameter of the straight section 3. A coaxial stopper 22 is provided at one end of the connecting section 2 near the straight section 3, and the stopper 33 is engageable within the stopper 22. A second hexagonal square hole 23 is coaxially provided within the connecting section 2 and is located at the bottom of the stopper 22.

[0036] In this embodiment, if Figure 2As shown, since the limit platform 33 is coaxially protruded between the connecting platform 31 and the straight section 3, and the diameter of the limit platform 33 is larger than the diameter of the connecting platform 31 and smaller than the outer diameter of the straight section 3, the limit platform 33 is engaged in the limit groove 22 to help coaxial limiting.

[0037] In this embodiment, if Figure 2 As shown, the second hexagonal square hole 23 is set at the bottom of the limiting groove 22 to achieve dual purposes.

[0038] Example 3

[0039] like Figure 3 The third embodiment of the extrusion die with a quick core replacement according to the present invention is shown.

[0040] This embodiment is similar to the first or second embodiment, except that the end of the connecting section 2, remote from the straight section 3, is detachably connected to the fixed mold core 6, and the die 1 is detachably attached to the compression mold 7. A compression cavity 8 is formed between the inner wall of the compression mold 7 and the outer wall of the fixed mold core 6, and the compression cavity 8 is connected to the compression channel 4. A fixing platform 24 is coaxially convexly provided on the end of the connecting section 2 near the fixed mold core 6, and the outer wall of the fixing platform 24 is provided with external threads. A fixing groove 61 is coaxially concavely provided on the end of the fixed mold core 6, and the inner wall of the fixing groove 61 is provided with internal threads. The fixing platform 24 is threadedly connected to the fixing groove 61. A locking platform 11 is coaxially provided at one end of the die 1. The outer diameter of the locking platform 11 is larger than that of the die 1. A locking groove 71 is coaxially provided at the end of the compression die 7. The locking platform 11 can be engaged with the locking groove 71. A locking pressure plate 9 is removably provided at the end of the compression die 7. The locking pressure plate 9 can be fitted over the outer wall of the die 1. The inner diameter of the locking pressure plate 9 is smaller than that of the locking platform 11. The locking pressure plate 9 is provided with a plurality of mounting holes 91. The compression die 7 has threaded holes corresponding to the mounting holes 91. Bolts are passed through the mounting holes 91 and threadedly connected to the threaded holes to abut the locking pressure plate 9 against the compression die 7.

[0041] In this embodiment, if Figure 3 As shown, the mouth die 1 is detachably set on the compression mold 7, and the connecting section 2 is detachably connected to the fixed mold core 6, so that a compression cavity 8 is formed between the inner wall of the compression mold 7 and the outer wall of the fixed mold core 6. The molten material enters the compression channel 4 after being pre-compressed in the compression cavity 8.

[0042] In this embodiment, if Figure 3 As shown, the fixing platform 24 is threadedly connected to the fixing groove 61 to achieve a detachable connection between the connecting section 2 and the fixed mold core 6.

[0043] In this embodiment, if Figure 3As shown, since the locking pressure plate 9 can be sleeved on the outer wall of the die 1, after the locking platform 11 is engaged in the locking groove 71, the locking pressure plate 9 is sleeved on the die 1 and covers the end of the compression die 7. Since the inner diameter of the locking pressure plate 9 is smaller than the inner diameter of the locking platform 11, the locking pressure plate 9 will restrict the locking platform 11, thereby limiting and fixing the die 1 and the compression die 7.

[0044] In this embodiment, if Figure 3 As shown, a bolt is passed through the mounting hole 91 and threadedly connected to the threaded hole to achieve a detachable connection between the locking plate 9 and the compression mold 7.

[0045] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An extrusion die with a quick core replacement, comprising a die (1) and a core body disposed within the die (1), characterized in that: The mold core body comprises a connecting section (2) and a straight section (3), the straight section (3) being detachably arranged at the end of the connecting section (2), a compression channel (4) being formed between the outer wall of the connecting section (2) and the inner wall of the die (1), an extrusion channel (5) being formed between the outer wall of the straight section (3) and the inner wall of the die (1), the compression channel (4) being communicated with the extrusion channel (5), the cross-sectional area of the compression channel (4) gradually decreasing from the end of the connecting section (2) away from the straight section (3) to the end of the extrusion channel (5), the cross-sectional area of the extrusion channel (5) being the same at any position, the end of the connecting section (2) away from the straight section (3) being detachably connected to the fixed mold core (6), the die (1) being detachably arranged on the compression die (7), a compression cavity (8) being formed between the inner wall of the compression die (7) and the outer wall of the fixed mold core (6), the compression cavity (8) being communicated with the compression channel (4).

2. The extrusion die with a quick core change according to claim 1, characterized in that: A connecting platform (31) is coaxially convexly provided at one end of the straight section (3) close to the connecting section (2), and an outer wall of the connecting platform (31) is provided with an external thread. A connecting groove (21) is coaxially concavely provided at one end of the connecting section (2) close to the straight section (3), and an inner wall of the connecting groove (21) is provided with an internal thread. The connecting platform (31) is threadedly connected to the connecting groove (21).

3. The extrusion die with a quick core change according to claim 2, characterized in that: A first hexagonal square hole (32) is coaxially provided at one end of the straight section (3) away from the connecting section (2).

4. The extrusion die with a quick core change according to claim 2, characterized in that: A limiting platform (33) is coaxially provided between the connecting platform (31) and the straight section (3), and the diameter of the limiting platform (33) is larger than the diameter of the connecting platform (31) and smaller than the outer diameter of the straight section (3); a limiting groove (22) is coaxially provided at one end of the connecting section (2) close to the straight section (3), and the limiting platform (33) can be engaged in the limiting groove (22).

5. The extrusion die with a quick core change according to claim 4, characterized in that: A second inner hexagonal square hole (23) is coaxially provided in the connecting section (2), and the second inner hexagonal square hole (23) is provided at the bottom of the limiting groove (22).

6. The extrusion die with a quick core change according to claim 1, characterized in that: A fixing platform (24) is coaxially convexly provided at one end of the connecting section (2) close to the fixed mold core (6), and an outer wall of the fixing platform (24) is provided with an external thread. A fixing groove (61) is coaxially concavely provided at the end of the fixed mold core (6), and an inner wall of the fixing groove (61) is provided with an internal thread. The fixing platform (24) is threadedly connected to the fixing groove (61).

7. The extrusion die with a quick core change according to claim 1, characterized in that: A locking platform (11) is coaxially provided at one end of the die (1), and the outer diameter of the locking platform (11) is larger than the outer diameter of the die (1). A locking groove (71) is coaxially recessed at the end of the compression die (7), and the locking platform (11) can be engaged in the locking groove (71). A locking pressure plate (9) is detachably covered at the end of the compression die (7), and the locking pressure plate (9) can be sleeved on the outer wall of the die (1). The inner diameter of the locking pressure plate (9) is smaller than the inner diameter of the locking platform (11).

8. The extrusion die with a quick core change according to claim 7, characterized in that: The locking pressure plate (9) is provided with a plurality of mounting holes (91), and the compression mold (7) is provided with threaded holes at positions corresponding to the plurality of mounting holes (91). Bolts are passed through the mounting holes (91) and are threadedly connected to the threaded holes so that the locking pressure plate (9) abuts against the compression mold (7).

9. The extrusion die with a quick core change according to claim 1, characterized in that: The straight section (3) and the connecting section (2) are coaxially provided with a communicating exhaust hole (10).

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