Extrusion die for heat-resistant polyethylene pipe

Abstract

The utility model discloses a heat-resistant polyethylene pipe extrusion die, which comprises a first outer die, a second outer die, a sprue spreader, a die head and a locking nut, one end of the die head is provided with a taper hole, the other end of the die head is provided with a through hole, the sprue spreader comprises a cone body part and a cylinder body part, an annular groove is arranged between the cone body part and the cylinder body part, a plurality of shunting holes are arranged in the annular groove, and the locking nut is arranged in the first outer die. One end of the cone part is inserted into the through hole and is in clearance fit with the through hole, a first stepped hole and a second stepped hole are formed in the axial end of the first outer mold, a third stepped hole and a threaded through hole are formed in the axial end of the second outer mold, the first stepped hole is communicated with the second stepped hole, the second stepped hole is communicated with the third stepped hole, and the third stepped hole is communicated with the threaded through hole; the locking nut is in threaded fit with the threaded through hole, and the cylinder part is in interference fit with the hole wall of the first stepped hole, the hole wall of the second stepped hole and the hole wall of the third stepped hole. According to the utility model, the thickness of the pipe wall is consistent after the pipe is extruded and molded, and the production efficiency of the heat-resistant polyethylene pipe is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to polyethylene pipe extrusion equipment technical field, specifically to the heat -resisting polyethylene pipe extrusion mould. BACKGROUND

[0002] Polyethylene pipe is the pipe of polyethylene material, and polyethylene is a kind of crystallinity high, non-polar thermoplastic resin, due to the good flexibility, high strength, strong impact resistance and good heat resistance of heat -resisting polyethylene pipe, the development momentum of heat -resisting polyethylene pipe is strong in the domestic, and the large-scale development of domestic ground heating industry.

[0003] Heat -resisting polyethylene pipe is usually extruded by extruder, and the key of forming is extrusion die (i.e. extrusion die head), in prior art, due to the poor coaxiality of extrusion die, the pipe wall thickness of polyethylene pipe after extrusion forming is inconsistent (due to the poor coaxiality, the pipe wall thickness is thin in some places, and thick in some places), and a method to solve the consistency of pipe wall thickness is to manually adjust the coaxiality of die head and flow divider cone after a period of use, this method not only affects the extrusion efficiency of extruder, but also cannot guarantee the precision of manual adjustment, and affects the quality of polyethylene pipe. UTILITY MODEL CONTENT

[0004] In view of the deficiencies of prior art, the utility model provides a heat -resisting polyethylene pipe extrusion die.

[0005] The technical scheme for solving the above technical problems is as follows:

[0006] Heat -resisting polyethylene pipe extrusion die, including the first outer mould of cylindrical, the second outer mould of cylindrical, the flow divider cone, the die head, still including the lock nut, the one end of die head is equipped with the conical hole, the other end of die head is equipped with the through hole, the conical hole is linked with the through hole, the flow divider cone includes the cone body and the cylinder, and the annular groove is equipped between the cone body and the cylinder, a plurality of flow divider holes are equipped in the annular groove, the one end of cone body is inserted into the through hole and is matched with the gap of through hole, the axial end of first outer mould is equipped with the first step hole and the second step hole, the axial end of second outer mould is equipped with the third step hole and the threaded through hole, the first step hole is linked with the second step hole, the second step hole is linked with the third step hole, the third step hole is linked with the threaded through hole, and the center of first step hole, second step hole, third step hole and threaded through hole is on the same axial line, the lock nut is screwed with threaded through hole, the hole wall of first step hole, the hole wall of second step hole and the hole wall of third step hole form annular assembly cavity, and the cylinder is located in annular assembly cavity, and the cylinder is interference fit with the hole wall of first step hole, the hole wall of second step hole and the hole wall of third step hole, the axial end of lock nut is in abutment with die head, and the axial end of die head is in abutment with cylinder.

[0007] Further, the axial end of the first outer die is further provided with a fourth stepped hole, a first tapered hole, a second tapered hole, the first tapered hole being in communication with the second tapered hole, the second tapered hole being in communication with a shunt hole, the shunt hole being in communication with a tapered hole, the tapered hole being in communication with a through hole, the first tapered hole, the second tapered hole, the shunt hole, the tapered hole and the through hole forming an extrusion channel.

[0008] Further, a shunt plate is further included, the axial end of the shunt plate being provided with a plurality of feed holes, the shunt plate being in interference fit with the fourth stepped hole, the feed holes being in communication with the first tapered hole.

[0009] Further, a cylindrical connecting sleeve is further included, the connecting sleeve being connected with the first outer die, the first outer die being connected with the second outer die, the axial end of the connecting sleeve being provided with a connecting sleeve threaded through hole, the connecting sleeve threaded through hole being in communication with the feed hole, the connecting sleeve being threadedly connected with the head of the screw extruder.

[0010] The utility model discloses the beneficial effects are: the utility model discloses a first stepped hole, second stepped hole, third stepped hole are set up, when the first outer die and second outer die are assembled, the hole wall of first stepped hole, the hole wall of second stepped hole and the hole wall of third stepped hole form annular assembly cavity, the cylindrical portion of shunt cone is assembled in annular assembly cavity, prevent shunt cone from shifting, and, the die head is locked with the cylindrical portion of shunt cone, and the die head is locked with locknut, avoid the die head from shifting. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 It is the perspective view of the utility model heat-resistant polyethylene pipe material extrusion die;

[0012] Fig. 2 It is the section view of first outer die, second outer die and connecting sleeve;

[0013] Fig. 3 It is the section view of the utility model heat-resistant polyethylene pipe material extrusion die.

[0014] Markings in the drawings:

[0015] Extrusion channel TD, first outer mold 1, first stepped hole 1-1, second stepped hole 1-2, fourth stepped hole 1-3, first conical hole 1-4, second conical hole 1-5, second outer mold 2, third stepped hole 2-1, threaded through hole 2-2, flow divider cone 3, cone body 3-1, column body 3-2, annular groove 3-3, flow divider hole 3-4, die head 4, conical hole 4-1, through hole 4-2, locking nut 5, annular assembly cavity 6, flow divider plate 10, feed hole 11, connecting sleeve 20, connecting sleeve threaded through hole 21. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] like Figs. 1 to 3 As shown, the heat-resistant polyethylene pipe extrusion die includes a cylindrical first outer die 1, a cylindrical second outer die 2, a flow divider cone 3, a die head 4, and a locking nut 5. One end of the die head 4 has a conical hole 4-1, and the other end has a through hole 4-2. The conical hole 4-1 communicates with the through hole 4-2. The flow divider cone 3 includes a conical portion 3-1 and a cylindrical portion 3-2. An annular groove 3-3 is provided between the conical portion 3-1 and the cylindrical portion 3-2. Several flow divider holes 3-4 are provided within the annular groove 3-3. One end of the conical portion 3-1 is inserted into the through hole 4-2 with a clearance fit. The axial end of the first outer die 1 has a first stepped hole 1-1 and a second stepped hole 1-2. The axial end of the second outer die 2 has a third stepped hole 2-1 and a threaded through hole 2-2. The first stepped hole 1-1... -1 is connected to the second step hole 1-2, the second step hole 1-2 is connected to the third step hole 2-1, and the third step hole 2-1 is connected to the threaded through hole 2-2. The centers of the first step hole 1-1, the second step hole 1-2, the third step hole 2-1, and the threaded through hole 2-2 are on the same axis. The locking nut 5 is threadedly engaged with the threaded through hole 2-2. The hole walls of the first step hole 1-1, the second step hole 1-2, and the third step hole 2-1 form an annular assembly cavity 6. The column part 3-2 is located in the annular assembly cavity 6. The column part 3-2 is interference-fitted with the hole walls of the first step hole 1-1, the second step hole 1-2, and the third step hole 2-1. The axial end of the locking nut 5 abuts against the die head 4, and the axial end of the die head 4 abuts against the column part 3-2.

[0018] Specifically, in the present embodiment, the flow divider cone 3 comprises a cone body 3-1 and a column body 3-2 which are integrally formed, wherein the column body 3-2 is located in the annular assembly cavity 6 and is limited in axial and radial movement by the annular assembly cavity 6, the die head 4 abuts against the cone body 3-1 of the flow divider cone 3, and the die head 4 passes through the hole of the locking nut 5 so that the outer wall surface of the die head 4 is in interference fit with the hole wall of the hole, and the locking nut 5 is screwed into the threaded hole 2-2 through the thread, so that the axial movement of the die head 4 is limited by the cone body 3-1 of the flow divider cone 3, and the locking nut 5 limits the movement of the die head 4, so that the extension of the cone body 3-1 of the flow divider cone 3 (as shown in the figure, the extension of the cone body 3-1 is located in the through hole 4-2 at the axial end of the die head 4, and the extension of the cone body 3-1 is cylindrical) and the center of the through hole 4-2 at the axial end of the die head 4 are always on the same axis line and do not deviate, thereby ensuring the uniform wall thickness of the heat-resistant polyethylene pipe after extrusion molding. Fig. 3

[0019] The axial end of the first outer die 1 is also provided with a fourth stepped hole 1-3, a first tapered hole 1-4, a second tapered hole 1-5, the first tapered hole 1-4 communicates with the second tapered hole 1-5, the second tapered hole 1-5 communicates with the flow divider hole 3-4, the flow divider hole 3-4 communicates with the tapered hole 4-1, the tapered hole 4-1 communicates with the through hole 4-2, and the first tapered hole 1-4, the second tapered hole 1-5, the flow divider hole 3-4, the tapered hole 4-1, and the through hole 4-2 form an extrusion channel TD.

[0020] The flow divider plate 10 is also included, the axial end of the flow divider plate 10 is provided with a plurality of feeding holes 11, the flow divider plate 10 is in interference fit with the fourth stepped hole 1-3, and the feeding holes 11 communicate with the first tapered hole 1-4.

[0021] A cylindrical connecting sleeve 20 is also included, the connecting sleeve 20 is connected with the first outer die 1, the first outer die 1 is connected with the second outer die 2, the axial end of the connecting sleeve 20 is provided with a connecting sleeve threaded hole 21, the connecting sleeve threaded hole 21 communicates with the feeding hole 11, and the connecting sleeve 20 is threadedly connected with the head of the screw extruder.

[0022] ​Specifically, the working principle of the utility model is: melt raw material enters into extrusion channel TD under the extrusion of double screw, finally extrudes into shape from through hole 4-2, specifically: first, melt raw material enters into the chamber formed by screw thread through hole 21 under the extrusion of double screw, with the melt raw material of the chamber more and more, raw material enters into first conical hole 1-4 through feed hole 11, then enters into second conical hole 1-5 from first conical hole 1-4, then raw material more and more, the pressure in first conical hole 1-4 and second conical hole 1-5 is bigger and bigger, raw material enters into conical hole 4-1 from shunt hole 3-4, then enters into through hole 4-2 again, under the extrusion of the extension section outer wall surface of vertebral body part 3-1 and through hole 4-2 inner hole wall surface, finally raw material extrudes from through hole 4-2, thereby forming heat-resistant polyethylene pipe.

[0023] Finally, it should be noted that: the above-described embodiments are merely the preferred embodiments of the utility model for describing the technical solutions of the utility model, and are not limited to them, and are not limited to the protection scope of the utility model; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the protection scope of the claims.

Claims

1. Hot-temperature polyethylene pipe extrusion die comprising a first outer die (1) in the shape of a cylinder, a second outer die (2) in the shape of a cylinder, a flow divider cone (3), a die head (4), characterized in that, The utility model also includes locking nut (5), one end of die head (4) is equipped with taper hole (4-1), the other end of die head (4) is equipped with through -hole (4-2), taper hole (4-1) communicates with through -hole (4-2), split flow cone (3) includes cone part (3-1) and cylinder part (3-2), and the cone part (3-1) is equipped with annular groove (3-3) with cylinder part (3-2), is equipped with a plurality of split flow holes (3-4) in annular groove (3-3), and the one end of cone part (3-1) is inserted into through -hole (4-2) with the clearance fit of through -hole (4-2), the axial end of first outer die (1) is equipped with first step hole (1-1) and second step hole (1-2), and the axial end of second outer die (2) is equipped with third step hole (2-1) and threaded through -hole (2-2), first step hole (1-1) communicates with second step hole (1-2), second step hole (1-2) communicates with third step hole (2-1), third step hole (2-1) communicates with threaded through -hole (2-2), and the center of first step hole (1-1), second step hole (1-2), third step hole (2-1) and threaded through -hole (2-2) is on the same axis, locking nut (5) is screwed with threaded through -hole (2-2), and the hole wall of first step hole (1-1), the hole wall of second step hole (1-2) and the hole wall of third step hole (2-1) form annular assembly cavity (6), and cylinder part (3-2) is located in annular assembly cavity (6), and cylinder part (3-2) is with the hole wall of first step hole (1-1), the hole wall of second step hole (1-2) and the hole wall of third step hole (2-1) interference fit, and the axial end of locking nut (5) is in abutment with die head (4), and the axial end of die head (4) is in abutment with cylinder part (3-2).

2. The heat resistant polyethylene pipe extrusion die of claim 1, wherein, The axial end of first outer die (1) is also equipped with fourth step hole (1-3), first taper hole (1-4), second taper hole (1-5), first taper hole (1-4) communicates with second taper hole (1-5), second taper hole (1-5) communicates with split flow hole (3-4), split flow hole (3-4) communicates with taper hole (4-1), taper hole (4-1) communicates with through -hole (4-2), and first taper hole (1-4), second taper hole (1-5), split flow hole (3-4), taper hole (4-1), through -hole (4-2) form extrusion channel (TD).

3. The heat resistant polyethylene pipe extrusion die of claim 2, wherein, It also includes split flow plate (10), and the axial end of split flow plate (10) is equipped with a plurality of feed holes (11), and split flow plate (10) is with fourth step hole (1-3) interference fit, and feed hole (11) communicates with first taper hole (1-4).

4. The heat resistant polyethylene pipe extrusion die of claim 1, wherein, It also includes cylindrical connecting sleeve (20), the connecting sleeve (20) is connected with first outer die (1), first outer die (1) is connected with second outer die (2), and the axial end of connecting sleeve (20) is equipped with connecting sleeve threaded through -hole (21), connecting sleeve threaded through -hole (21) communicates with feed hole (11), and connecting sleeve (20) is connected with the head of screw extruder with thread.

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