Machining die for PEX-A connecting piece

Abstract

The utility model provides a machining die for a PEX-A connecting piece, and relates to the technical field of plastic pipeline connecting devices. The two split type upper dies are arranged, the second upper die and the lower die are matched to limit the PEX-A connecting piece, the PEX-A connecting piece is arranged on a third protruding part of the lower die in a sleeving mode, the outer surface of the PEX-A connecting piece abuts against the inner hole face of the second upper die, and a first groove of the first upper die can conduct downward stamping to change the shape of the heated PEX-A connecting piece; a fourth groove is machined in one end of the PEX-A connecting piece, redundant plastic can be extruded to a third protruding part of the lower die due to the extrusion effect, the third protruding part is filled with the redundant plastic, after solidification forming, the plastic at the third protruding part forms a limiting ring on the PEX-A connecting piece, and the PEX-A connecting piece prepared through the machining die is smooth in surface, free of glue overflowing and free of bubbles. And the production quality is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic pipe connection devices, in particular to a processing mould for a PEX-A connection piece. Background Art

[0002] PEX-a pipes usually need to be connected with other pipes during use. PEX-a connectors are important connecting structures used to connect other pipes and PEX-a pipes. PEX-a connectors have the advantages of high strength, high flexibility, and strong recovery ability, and can be used in a wider range of application scenarios.

[0003] During the processing of PEX-a connectors, it is usually necessary to process a limit ring at one end of the connector, which can be used for limiting when installing the pipe. Currently, when the limit ring of the PEX-a connector is processed by hot pressing, only the limit ring of the PEX-a connector is processed, and the heated glue may overflow, affecting the quality of the PEX-a connector; at the same time, air holes or lumps may appear due to different hot pressing processes, which will also affect the appearance and function of the PEX-a connector.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The utility model aims to provide a processing die for a PEX-A connector, which can obtain a PEX-A connector with a smooth and regular surface morphology.

[0006] The embodiment of the utility model is achieved as follows:

[0007] In a first aspect, the utility model provides a processing mold for a PEX-A connector, comprising a first upper mold, a second upper mold and a lower mold.

[0008] The first upper mold includes a first base and a first protrusion, the first base and the first protrusion are coaxially fixedly connected, and the diameter of the first base is larger than the diameter of the first protrusion, and the first protrusion is provided with a first groove recessed toward the axis, and the first groove is located at the edge of the end face of the first protrusion away from the first base.

[0009] The second upper die includes an annular body, the inner diameter of which is greater than the diameter of the first protrusion, and the diameter difference is ≤0.2 mm, so as to ensure that the first protrusion of the first upper die can just extend into the inner hole of the annular body. The annular body includes a first annular surface and a second annular surface, and the inner hole surface of the annular body on one side of the second annular surface is provided with an inclined surface whose diameter increases successively toward the second annular surface, and the annular body is sleeved on the surface of the first protrusion of the first upper die, and the first annular surface of the annular body contacts the first base of the first upper die.

[0010] The inner hole surface of the annular body is provided with an inclined surface for guiding flow. When PEX-A is heated and pressed down, the plastic on the entire plane will overflow along the mold. The inclined surface provides deformation space for the overflow of the plastic, which can prevent the occurrence of glue overflow.

[0011] The lower mold includes a third base and a third protrusion, the third base and the third protrusion are coaxially fixedly connected, and the diameter of the third base is larger than the diameter of the third protrusion, the diameter of the third protrusion is smaller than the diameter of the first protrusion, the third protrusion can be selectively sleeved in the first protrusion, and the third protrusion is provided with a third groove recessed toward the axis, and the third groove is located at the edge of the end face of the third protrusion away from the third base.

[0012] It can be understood that the processing mold of the PEX-A connector provided by the utility model, its first upper mold, second upper mold and lower mold are all separate split structures, and the first protrusion of the first upper mold is sleeved in the second upper mold to form a split combined upper mold, and the length of the first protrusion is less than the height of the annular body of the second upper mold, so the third protrusion of the lower mold can extend into the inner hole of the annular body and contact with the first upper mold. When the processing mold of the PEX-A connector provided by the utility model is in a non-assembled state, the third protrusion may not be sleeved in the first protrusion.

[0013] In an optional embodiment, the difference between the diameter of the third protrusion and the diameter of the first protrusion is the thickness of the PEX-A connector, so that after the processing mold of the PEX-A connector is assembled, the second upper mold and the lower mold can fix the PEX-A connector.

[0014] In an optional embodiment, in order to ensure a stable connection between the first upper mold and the second upper mold, a positioning member is further included. The first protrusion of the first upper mold is provided with a first positioning hole, and the annular body of the second upper mold is provided with a second positioning hole that passes through the axis. The positioning member passes through the second positioning hole and is accommodated in the first positioning hole, so as to position the first upper mold and the second upper mold.

[0015] In an optional embodiment, the positioning member may be any one of a screw and a threaded rod.

[0016] In an optional embodiment, the number of the first positioning holes is the same as the number of the second positioning holes, and both are 2 to 10. The plurality of first positioning holes are evenly spaced and distributed, and the positions of the second positioning holes are arranged in one-to-one correspondence with the first positioning holes.

[0017] In an optional embodiment, a first inner hole is further formed on the end surface of the first raised portion of the first upper mold away from the first base, and the diameter of the first inner hole is greater than the diameter of the third groove, and the diameter difference is ≤0.2mm, so as to ensure that the third groove can be just accommodated in the first inner hole, so as to facilitate the control of the thickness of the limit ring and discharge the gas in the overflowing plastic into the first inner hole, so as to prevent the formation of air holes on the PEX-A connector.

[0018] In an optional embodiment, a third inner hole is further formed on the end surface of the third protrusion of the lower mold away from the third base. The diameter of the third inner hole is smaller than the diameter of the third groove and is used to discharge gas in the overflowing plastic to prevent air holes from forming on the PEX-A connector.

[0019] In an optional embodiment, the diameter of the first base of the first upper mold is equal to the outer diameter of the annular body of the second upper mold.

[0020] In an optional embodiment, the diameter of the third base of the lower mold is greater than or equal to the diameter of the first base of the first upper mold to ensure the stability of the entire processing mold.

[0021] In an optional embodiment, a plurality of through first mounting holes are provided on the first base of the first upper mold for fixing the position of the first upper mold, and the connecting member can fix the first upper mold through the first mounting holes to ensure stable stamping.

[0022] In an optional embodiment, a plurality of through third mounting holes are provided on the third base of the lower die for fixing the position of the lower die, and the connecting member can fix the lower die through the third mounting holes to ensure stable stamping.

[0023] In an optional embodiment, since the first groove and the third groove are grooves respectively opened on the edges of different raised portions, the diameters of the first groove and the third groove mentioned in the text refer to the diameters of the corresponding raised portion edges after the grooves are cut off, that is, the width of the first groove + the diameter of the first groove = the diameter of the first raised portion, and similarly, the width of the third groove + the diameter of the third groove = the diameter of the third raised portion.

[0024] The beneficial effects of the embodiments of the utility model are:

[0025] The utility model provides a processing mold for a PEX-A connector, which is provided with two split upper molds, wherein the second upper mold cooperates with the lower mold to limit the PEX-A connector, the PEX-A connector is sleeved on the third protrusion of the lower mold, and the outer surface is supported by the inner hole surface of the second upper mold, and the first groove of the first upper mold can be punched downward to change the morphology of the heated PEX-A connector, and a fourth groove is processed at one end of the PEX-A connector. Due to the extrusion effect, excess plastic will be squeezed to the third protrusion of the lower mold and fill the third protrusion. After solidification and forming, the plastic at the third protrusion forms a limiting ring on the PEX-A connector. The PEX-A connector prepared by the processing mold has a smooth surface, no glue overflow, no bubbles, and more stable production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the three-dimensional structure of a processing mold for a PEX-A connector provided in an embodiment of the utility model;

[0028] Figure 2 A cross-sectional view of a processing mold for a PEX-A connector provided in an embodiment of the utility model;

[0029] Figure 3 A schematic diagram of the three-dimensional structure of the first upper mold provided by an embodiment of the utility model;

[0030] Figure 4 A cross-sectional view of a first upper mold provided in an embodiment of the utility model;

[0031] Figure 5 A schematic diagram of the three-dimensional structure of the second upper mold provided by an embodiment of the utility model;

[0032] Figure 6 A cross-sectional view of a second upper mold provided by an embodiment of the utility model;

[0033] Figure 7 A schematic diagram of the three-dimensional structure of the lower mold provided by an embodiment of the utility model;

[0034] Figure 8 A cross-sectional view of a lower mold provided by an embodiment of the utility model;

[0035] Fig. 9A working principle diagram of a processing mold for a PEX-A connector provided in an embodiment of the utility model;

[0036] Fig.10 for Fig. 9 A magnified view of the structure in the middle;

[0037] Fig.11 A three-dimensional view of a PEX-A connector to be processed provided in an embodiment of the utility model;

[0038] Fig.12 A schematic diagram of the three-dimensional structure of a processed PEX-A connector provided in an embodiment of the utility model;

[0039] Fig.13 A cross-sectional view of a processed PEX-A connector provided in an embodiment of the present invention.

[0040] Icons: 100-processing mold; 110-first upper mold; 111-first base; 112-first protrusion; 113-first groove; 114-first positioning hole; 115-first inner hole; 116-first mounting hole; 120-second upper mold; 121-first annular surface; 122-second annular surface; 123-inclined surface; 124-second positioning hole; 130-lower mold; 131-third base; 132-third protrusion; 133-third groove; 134-third inner hole; 135-third mounting hole; 200-PEX-A connector; 210-limiting ring; 220-fourth groove; 230-fourth inner hole. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model 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 operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0046] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 indirectly connected 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 according to specific circumstances.

[0047] First embodiment

[0048] Please refer to Figure 1 and Figure 2 This embodiment provides a processing mold 100 for a PEX-A connector 200 , which includes a first upper mold 110 , a second upper mold 120 and a lower mold 130 .

[0049] Please refer to Figure 3 and Figure 4 The first upper mold 110 includes a first base 111 and a first protruding portion 112, the first base 111 and the first protruding portion 112 are coaxially fixedly connected, and the diameter of the first base 111 is larger than the diameter of the first protruding portion 112, and the first protruding portion 112 is provided with a first groove 113 recessed toward the axis, and the first groove 113 is located at the edge of the end surface of the first protruding portion 112 away from the first base 111.

[0050] Please refer to Figure 5 and Figure 6The second upper mold 120 includes an annular body, the inner diameter of which is greater than the diameter of the first protrusion 112, and the diameter difference is ≤0.2mm, so as to ensure that the first protrusion 112 of the first upper mold 110 can just extend into the inner hole of the annular body. The annular body includes a first annular surface 121 and a second annular surface 122. The inner hole surface of the annular body on one side of the second annular surface 122 is provided with an inclined surface 123 whose diameter increases successively toward the second annular surface 122. The annular body is sleeved on the surface of the first protrusion 112 of the first upper mold 110, and the first annular surface 121 of the annular body is in contact with the first base 111 of the first upper mold 110.

[0051] The inclined surface 123 is arranged on the inner hole surface of the annular body for guiding flow. When the PEX-A is heated and pressed down, the plastic on the entire plane will overflow along the mold. The inclined surface 123 provides deformation space for the overflow of the plastic, which can prevent the occurrence of glue overflow.

[0052] Please refer to Figure 7 and Figure 8 The lower mold 130 includes a third base 131 and a third protrusion 132, the third base 131 and the third protrusion 132 are coaxially fixedly connected, and the diameter of the third base 131 is larger than the diameter of the third protrusion 132, and the diameter of the third protrusion 132 is smaller than the diameter of the first protrusion 112, the third protrusion 132 can be selectively sleeved in the first protrusion 112, and the third protrusion 132 is provided with a third groove 133 recessed toward the axis, and the third groove 133 is located at the edge of the end surface of the third protrusion 132 away from the third base 131.

[0053] It can be understood that the processing mold 100 of the PEX-A connector 200 provided in this embodiment, its first upper mold 110, second upper mold 120 and lower mold 130 are all separate separate structures, and the first protrusion 112 of the first upper mold 110 can be sleeved in the second upper mold 120 to form a split combined upper mold, and the length of the first protrusion 112 is less than the height of the annular body of the second upper mold 120, so the third protrusion 132 of the lower mold 130 can extend into the inner hole of the annular body and cooperate with the first upper mold 110. When the processing mold 100 of the PEX-A connector 200 of this embodiment is in a non-assembled state, the third protrusion 132 may not be sleeved in the first protrusion 112.

[0054] Please refer to Fig. 9 In this embodiment, the difference between the diameter of the third protrusion 132 and the diameter of the first protrusion 112 is the thickness of the PEX-A connector 200. After the processing mold 100 of the PEX-A connector 200 is assembled, the second upper mold 120 and the lower mold 130 can fix the PEX-A connector 200.

[0055] In this embodiment, in order to ensure that the first upper mold 110 and the second upper mold 120 are stably connected, a positioning member is also included. The first protrusion 112 of the first upper mold 110 is provided with a first positioning hole 114, and the annular body of the second upper mold 120 is provided with a through second positioning hole 124 toward the axis. The positioning member passes through the second positioning hole 124 and is accommodated in the first positioning hole 114, so as to position the first upper mold 110 and the second upper mold 120.

[0056] In this embodiment, the positioning member is a screw rod, and both the first positioning hole 114 and the second positioning hole 124 are provided with threads for mating with the screw rod threads.

[0057] In this embodiment, the number of the first positioning holes 114 and the number of the second positioning holes 124 are the same, both being four. The four first positioning holes 114 are evenly spaced, and the positions of the second positioning holes 124 are arranged in a one-to-one correspondence with the first positioning holes 114 .

[0058] Please refer to Fig.10 In this embodiment, a first inner hole 115 is further formed on the end surface of the first raised portion 112 of the first upper mold 110 away from the first base 111. The diameter of the first inner hole 115 is greater than the diameter of the third groove 133, and the diameter difference is ≤0.2 mm, so as to ensure that the third groove 133 can be just accommodated in the first inner hole 115, so as to facilitate the control of the thickness of the limit ring 210 and discharge the gas in the overflowing plastic into the first inner hole 115, so as to prevent the formation of air holes on the PEX-A connector 200.

[0059] In this embodiment, a third inner hole 134 is further formed on the end surface of the third protrusion 132 of the lower mold 130 away from the third base 131. The diameter of the third inner hole 134 is smaller than the diameter of the third groove 133 and is used to discharge gas in the overflowing plastic to prevent air holes from being generated on the PEX-A connector 200.

[0060] In this embodiment, the diameter of the first base 111 of the first upper mold 110 is equal to the outer diameter of the annular body of the second upper mold 120 .

[0061] In this embodiment, the diameter of the third base 131 of the lower mold 130 is greater than or equal to the diameter of the first base 111 of the first upper mold 110 to ensure the stability of the entire processing mold 100 .

[0062] In this embodiment, a plurality of through first mounting holes 116 are provided on the first base 111 of the first upper mold 110 for fixing the position of the first upper mold 110 . The connector can fix the first upper mold 110 through the first mounting holes 116 to ensure stable stamping.

[0063] In this embodiment, a plurality of through third mounting holes 135 are provided on the third base 131 of the lower mold 130 for fixing the position of the lower mold 130 . The connector can fix the lower mold 130 through the third mounting holes 135 to ensure stable stamping.

[0064] In the present embodiment, since the first groove 113 and the third groove 133 are grooves respectively opened on the edges of different protruding parts, the diameters of the first groove 113 and the third groove 133 mentioned in the text refer to the diameters of the corresponding protruding parts after the grooves are cut off, that is, the width of the first groove 113 + the diameter of the first groove 113 = the diameter of the first protruding part 112, and similarly, the width of the third groove 133 + the diameter of the third groove 133 = the diameter of the third protruding part 132.

[0065] This embodiment provides a processing mold 100 for a PEX-A connector 200, and its working principle is as follows:

[0066] Please refer to Fig. 9 , Figure 11 to Figure 13 , the first protrusion 112 of the first upper mold 110 is inserted into the inner hole of the second upper mold 120, the first base 111 of the first upper mold 110 contacts the first annular surface 121 of the second upper mold 120, and then the first upper mold 110 and the second upper mold 120 are fixed by a positioning member. The PEX-A connector 200 to be processed is an annular mold with a through fourth inner hole 230. The PEX-A connector 200 to be processed is inserted on the surface of the third protrusion 132 of the lower mold 130, the fourth inner hole 230 contacts the inner hole of the second upper mold, and it is ensured that the temperature of the end of the PEX-A connector 200 away from the third base 131 reaches a temperature at which it can be deformed, that is, it is heated. The first upper mold 110 and the second upper mold 120 are placed as a whole on the lower mold 130 so that the third protrusion 132 of the lower mold 130 faces the first protrusion 112 of the first upper mold 110. The second upper mold 120 and the lower mold 130 clamp the PEX-A connector 200 together, and the third groove 133 of the third protrusion 132 is adjusted to fit into the first inner hole 115 of the first protrusion 112. Then, the lower mold 130 is fixed by the third mounting hole 135, and the first upper mold 110 is fixed to the stamping tool by the first mounting hole 116. The stamping tool is used to apply downward pressure to the processing mold 100 of the PEX-A connector 200 to deform the heated end of the PEX-A connector 200.

[0067] First, due to the limitation of the first groove 113 of the first upper mold 110, the plastic of the PEX-A connector 200 close to the inner hole is squeezed to form a fourth groove 220 at one end of the PEX-A connector 200. Due to the extrusion effect, the excess plastic will be squeezed to the third protrusion 132 of the lower mold 130 and fill the third protrusion 132. After solidification, the plastic at the third protrusion 132 forms a limiting ring 210 on the PEX-A connector 200. The excess gas generated during the extrusion process can be discharged to the first inner hole 115 or the third inner hole 134 to prevent the appearance of air holes. In addition to forming the limiting ring 210, the overflowed plastic can also be filled at one end of the PEX-A connector 200 with the limiting ring 210 if there is any surplus, and the plastic can be filled in the direction of the inclined surface 123 as the inclined surface 123 of the second upper mold 120 acts to prevent glue overflow. The PEX-A connector 200 produced by the processing mold 100 has a smooth surface, no glue overflow, no bubbles, and more stable production quality.

[0068] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A processing mold for a PEX-A connector, characterized in that: comprising a first upper die, a second upper die and a lower die; The first upper mold includes a first base and a first protrusion, the first base and the first protrusion are coaxially fixedly connected, and the diameter of the first base is larger than the diameter of the first protrusion, the first protrusion is provided with a first groove recessed toward the axis, and the first groove is located at the edge of the end surface of the first protrusion away from the first base; The second upper die comprises an annular body, the inner diameter of the annular body is greater than the diameter of the first protrusion, and the diameter difference is ≤0.2 mm, the annular body comprises a first annular surface and a second annular surface, the inner hole surface of the annular body on one side of the second annular surface is provided with an inclined surface whose diameter increases sequentially toward the second annular surface, the annular body is sleeved on the surface of the first protrusion of the first upper die, and the first annular surface of the annular body is in contact with the first base of the first upper die; The lower mold includes a third base and a third protrusion, the third base and the third protrusion are coaxially fixedly connected, and the diameter of the third base is larger than the diameter of the third protrusion, and the diameter of the third protrusion is smaller than the diameter of the first protrusion, and the third protrusion can be selectively inserted into the first protrusion, and the third protrusion is provided with a third groove recessed toward the axis, and the third groove is located at the edge of the end surface of the third protrusion away from the third base.

2. The processing mold for the PEX-A connector according to claim 1, characterized in that: The difference between the diameter of the third protrusion and the diameter of the first protrusion is the thickness of the PEX-A connector.

3. The processing mold for the PEX-A connector according to claim 1, characterized in that: It also includes a positioning piece, the first protrusion of the first upper mold is provided with a first positioning hole, the annular body of the second upper mold is provided with a through second positioning hole toward the axis, and the positioning piece passes through the second positioning hole and is accommodated in the first positioning hole.

4. The processing mold for the PEX-A connector according to claim 3, characterized in that: The number of the first positioning holes is the same as the number of the second positioning holes, and both are 2 to 10.

5. The processing mold for the PEX-A connector according to claim 1, characterized in that: A first inner hole is further formed on the end surface of the first protrusion of the first upper mold away from the first base. The diameter of the first inner hole is greater than the diameter of the third groove, and the diameter difference is ≤0.2 mm.

6. The processing mold for the PEX-A connector according to claim 1, characterized in that: A third inner hole is also formed on the end surface of the third protrusion of the lower mold away from the third base, and the diameter of the third inner hole is smaller than the diameter of the third groove.

7. The processing mold for the PEX-A connector according to claim 1, characterized in that: The diameter of the first base of the first upper mold is equal to the outer diameter of the annular body of the second upper mold.

8. The processing mold for the PEX-A connector according to claim 7, characterized in that: The diameter of the third base of the lower mold is greater than or equal to the diameter of the first base of the first upper mold.

9. The processing mold for the PEX-A connector according to claim 1, characterized in that: A plurality of through first mounting holes are formed on the first base of the first upper mold for fixing the position of the first upper mold.

10. The processing mold for the PEX-A connector according to claim 1, characterized in that: A plurality of through third mounting holes are provided on the third base of the lower mold for fixing the position of the lower mold.

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