PE pipe extruder with preheating mechanism

Abstract

The utility model provides a PE pipe extruder with a preheating mechanism, and relates to the technical field of PE pipe extrusion. The PE pipe extruder with the preheating mechanism comprises an extrusion molding barrel and a machine body used for supporting the extrusion molding barrel, and further comprises a preheating screw rod located in the extrusion molding barrel, and the preheating screw rod is externally connected with a transmission mechanism; the preheating screw rod comprises a screw rod body internally provided with a cavity, and a heating piece is arranged in the screw rod body. According to the PE pipe extruder with the preheating mechanism disclosed by the utility model, the screw body is heated through the heating piece, so that a heating source for plastic melting is not limited to heat transfer from an extrusion molding barrel (equivalent to an outer layer of molten plastic), but is based on synchronous internal and external heating of the extrusion molding barrel and the preheating screw (equivalent to an inner layer of the molten plastic); plastic raw materials can reach a required melting point as far as possible before entering an extruder, so that subsequent materials are fully melted, the heating is more uniform, and the melting speed is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of PE pipe extrusion, in particular to a PE pipe extruder with a preheating mechanism. Background Art

[0002] PE pipe extrusion is a common production process used to manufacture polyethylene (PE) pipes. The pre-prepared polyethylene particles are transported to the extrusion barrel in the extruder through the feeding system. The extrusion barrel is integrated with a heating mechanism. In the extrusion barrel, the heating mechanism attached to the extrusion barrel heats the raw materials to melt and form molten polyethylene;

[0003] At the same time, the molten polyethylene is driven forward by the synchronous rotation of the feed screw and enters the mold cavity of the extruder for extrusion.

[0004] In view of the above, the extruder usually melts the plastic mainly by the heating mechanism attached to the extrusion barrel. In order to ensure the stability of the product quality of PE pipes, even if the plastic is fully melted during the extrusion process, a preheating mechanism is generally installed at the feed end of the extruder. Although it can achieve a certain preheating effect, this structure is installed. First, the extruder occupies a larger space. Second, because it is an external preheating method, in fact, the melting effect of the inner and outer layers of the plastic being melted synchronously inside the extrusion barrel is relatively good.

[0005] Therefore, it is necessary to provide a new PE pipe extruder with a preheating mechanism to solve the above-mentioned technical problems. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a PE pipe extruder with a preheating mechanism.

[0007] The PE pipe extruder with a preheating mechanism provided by the utility model comprises: an extrusion barrel and a body for supporting the extrusion barrel, and also comprises a preheating screw located inside the extrusion barrel, wherein the preheating screw is externally connected to a transmission mechanism;

[0008] The preheating screw comprises a screw body with a cavity formed inside, and a heating element is arranged inside the screw body.

[0009] Preferably, a support frame is provided between the extrusion cylinder and the machine body, and the extrusion cylinder is fixedly connected to the top of the machine body through the support frame.

[0010] Preferably, the preheating screw is rotatably connected to the interior of the extrusion barrel, and the tail end of the preheating screw is connected to the mechanical output end of the transmission mechanism.

[0011] Preferably, the heating element is externally connected to a fixing frame for supporting and fixing the heating element.

[0012] Preferably, the heating element matches the structure of the screw body, and the heating element is fixedly connected to one end of the fixing frame, and the other end of the fixing frame is fixedly connected to the machine body.

[0013] Preferably, the heating element is dynamically sealed to the screw body.

[0014] Preferably, the screw body is connected to the heating element in a rotational dynamic seal via a dynamic seal structure.

[0015] Preferably, there is a gap between the screw body and the heating element, and the gap is filled with heat-conducting liquid.

[0016] Preferably, the heat transfer fluid is heat transfer oil.

[0017] Preferably, a cavity is provided inside the fixing frame for placing connecting wires of the heating element thereon.

[0018] Preferably, the transmission mechanism includes a gear 1 connected to the screw body, and a gear 2 meshing with the gear 1, and the gear 2 is externally connected to a motor.

[0019] Preferably, the gear one is fixedly connected to the outer wall of the screw body adjacent to one end of the transmission mechanism, and the gear one is meshed with the gear two, the gear two is fixedly connected to the rotor of the motor, and the main body of the motor is fixedly connected to the machine body.

[0020] Compared with the related art, the PE pipe extruder with a preheating mechanism provided by the utility model has the following beneficial effects:

[0021] 1. This PE pipe extruder with a preheating mechanism heats the screw body through a heating element through a preheating screw. As a result, the heat source for the molten plastic is not limited to the heat transfer from the extrusion barrel (equivalent to the outer layer of the molten plastic), but is based on the extrusion barrel and the preheating screw (equivalent to the inner layer of the molten plastic) being heated synchronously inside and outside. The plastic raw material can reach the required melting point as much as possible before entering the extruder to ensure that the subsequent material is fully melted, the heating is more uniform and the melting speed is faster, and at the same time, the temperature stability of the melt during the extrusion process is effectively guaranteed.

[0022] 2. For this PE pipe extruder with a preheating mechanism, the extrusion barrel may be heated in sections. For this purpose, a plurality of heating elements may be provided inside the screw body to meet the heating requirements of the extrusion barrel, so that the inner and outer layers of the molten plastic between the extrusion barrel and the preheating feeding screw are heated uniformly, thereby ensuring the heating uniformity of the molten plastic to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model is a schematic diagram of the overall structure of a PE pipe extruder with a preheating mechanism.

[0024] Figure 2 It is a side view of the overall structure of a PE pipe extruder with a preheating mechanism according to the utility model.

[0025] Figure 3 The utility model is a schematic structural diagram of a transmission mechanism for a PE pipe extruder with a preheating mechanism.

[0026] Figure 4 This is a structural analysis diagram of a feeding screw for a PE pipe extruder with a preheating mechanism according to the utility model.

[0027] Figure 5 It is a side view of a PE pipe extruder with a preheating mechanism according to the utility model.

[0028] Figure 6 The utility model is a partial structural schematic diagram of a feeding screw for a PE pipe extruder with a preheating mechanism.

[0029] In the figure: 1. extrusion barrel; 2. preheating screw; 3. machine body; 4. transmission mechanism; 21. screw body; 22. heating element; 23. fixing frame; 24. heat transfer fluid; 21-1. dynamic sealing structure; 41. gear one; 42. gear two; 43. motor. DETAILED DESCRIPTION

[0030] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0031] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention will be further described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0032] In order to address the shortcomings of the existing technology, such as Figure 1 , 2 As shown, the utility model provides a PE pipe extruder with a preheating mechanism, a support frame is provided between the extrusion cylinder 1 and the machine body 3, and the extrusion cylinder 1 is fixedly connected to the upper part of the machine body 3 through the support frame;

[0033] The preheating screw 2 is rotatably connected to the inside of the extrusion cylinder 1 , and the tail end of the preheating screw 2 is connected to the mechanical output end of the transmission mechanism 4 .

[0034] It should be noted that in the process of processing PE pipes, the plastic raw materials enter the interior of the extrusion barrel 1 through the feeding mechanism on the extruder. During this process, the heating mechanism attached to the extrusion barrel 1 starts heating. Similarly, the preheating feeding screw 2 is also heated. At the same time, the preheating feeding screw 2 is driven to rotate through the transmission mechanism 4, driving the plastic raw materials to move, melt and extrude inside the extrusion barrel 1.

[0035] The heating mechanism attached to the extrusion cylinder 1 is a well-known technology in the art. Generally, an electromagnetic heater is selected and integrated with the extrusion cylinder 1, and no further details are given here.

[0036] Specifically, Figure 4 As shown, a preheating feeding screw 2 for a PE pipe extruder with a preheating mechanism, a heating element 22 matches the structure of a screw body 21, and the heating element 22 is fixedly connected to one end of a fixing frame 23, and the other end of the fixing frame 23 is fixedly connected to a machine body 3;

[0037] The screw body 21 is connected to the heating element 22 in a rotary dynamic seal through a dynamic seal structure 21 - 1 .

[0038] It should be noted that the utility model is a PE pipe extruder with a preheating mechanism. By setting up a preheating feeding screw 2, during the PE pipe extrusion process, the heating mechanism attached to the extrusion barrel 1 is started and the heating element 22 is started at the same time, so that the heating element 22 generates a certain amount of heat to preheat the screw body 21, and then the preheating feeding screw 2 is driven by the transmission mechanism 4 to rotate inside the extrusion barrel 1 to melt and extrude the pipe.

[0039] The screw body 21 is heated by the heating element 22, so that the heat source of the plastic melt is not limited to the heat transfer from the extrusion barrel 1 (equivalent to the outer layer of the molten plastic), but is based on the extrusion barrel 1 and the preheating screw 2 (equivalent to the inner layer of the molten plastic) being heated synchronously inside and outside, so that the plastic raw material can reach the required melting point as much as possible before entering the extruder, so as to ensure that the subsequent materials are fully melted, the heating is more uniform and the melting speed is faster, and at the same time, the temperature stability of the melt during the extrusion process is effectively guaranteed;

[0040] The working principle of the heating element 22 is consistent with the working principle of the heating mechanism attached to the extrusion barrel 1 . In this embodiment, the heating element 22 is in the shape of a long rod so as to better fit the screw body 21 and not affect the normal rotation of the screw body 21 .

[0041] As a preferred embodiment, Figure 5 In the structure shown, there is a gap between the screw body 21 and the heating element 22, and the gap is filled with a heat transfer fluid 24.

[0042] It should be noted that the heat transfer fluid 24 is preferably heat transfer oil. Therefore, in the process of preheating the screw body 21, the heating is performed by the heating element 22, and then the heat is transferred to the heat transfer fluid 24, and the heat transfer fluid 24 transfers the heat to the screw body 21 to achieve heating and preheating.

[0043] Among them, the heat transfer fluid 24 effectively ensures the normal heat conduction of the heating element 22 while directly avoiding direct contact between the screw body 21 and the heating element 22. Therefore, during the rotation of the screw body 21, the possible wear effect between the screw body 21 and the heating element 22 can be effectively avoided, thereby indirectly ensuring the service life of the heating element 22.

[0044] As a preferred embodiment, Figure 6 In the structure shown, a cavity is opened inside the fixing frame 23, so that the connecting wires of the heating element 22 can be connected through the fixing frame 23. While the fixing frame 23 supports the heating element 22, it ensures the reasonable routing of the wires of the preheating feed screw 2 to the greatest extent.

[0045] In addition, the extrusion barrel 1 may be heated in sections. For this purpose, a plurality of heating elements 22 may be provided inside the screw body 21 to meet the heating requirements of the extrusion barrel 1 so that the inner and outer layers of the molten plastic between the extrusion barrel 1 and the preheating feeding screw 2 are heated uniformly, thereby ensuring the heating uniformity of the molten plastic to the greatest extent.

[0046] Specific, and Figure 3 , 4 As shown, a transmission mechanism 4 for a PE pipe extruder with a preheating mechanism, gear 1 41 is fixedly connected to the outer wall of the screw body 21 near one end of the transmission mechanism 4, and gear 1 41 is meshed with gear 2 42, gear 2 42 is fixedly connected to the rotor thereon of the motor, and the main body of the motor is fixedly connected to the machine body 3.

[0047] It should be noted that the utility model is a PE pipe extruder with a preheating mechanism. Through the transmission mechanism 4, the preheating feeding screw 2 is driven by the motor 43 to drive the gear 2 42. After the motor 43 is started, the rotor on the motor 43 drives the gear 2 42 to rotate. During this process, the gear 2 42 drives the gear 1 41 to rotate, thereby driving the screw body 21 to rotate inside the extrusion barrel 1.

[0048] Among them, the transmission direction of the motor 43 is changed by combining the gear 2 42 with the gear 1 41, so that the transmission mode of the transmission mechanism 4 is more compatible with the operation of the preheating screw 2. While ensuring the effective support of the heating element 22 inside the preheating screw 2, the screw body 21 can also be normally driven by the transmission mechanism 4 to ensure the normal operation of the extruder.

[0049] During the rotation of the screw body 21 , the heating element 22 is supported and fixed by the fixing frame 23 . The dynamic sealing connection between the screw body 21 and the heating element 22 is realized by the dynamic sealing structure 21 - 1 , which can effectively ensure good sealing between the screw body 21 and the heating element 22 .

[0050] Among them, the structure of the dynamic sealing structure 21-1 is not limited in this embodiment. In this embodiment, the rotation dynamic sealing function of the dynamic sealing structure 21-1 is mainly used. The structure of the dynamic sealing structure 21-1 is a well-known technology in the field, so it will not be described in detail here. For example, a stepped labyrinth seal can be used to achieve the effect of a rotation dynamic seal.

[0051] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0052] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A PE pipe extruder with a preheating mechanism, characterized in that: The invention comprises an extrusion barrel (1) and a body (3) for supporting the extrusion barrel (1), and is characterized in that it also comprises a preheating screw (2) located inside the extrusion barrel (1), and the preheating screw (2) is externally connected to a transmission mechanism (4): The preheating screw (2) comprises a screw body (21) with a cavity formed therein, and a heating element (22) is arranged inside the screw body (21); The heating element (22) is dynamically sealed to the screw body (21); There is a gap between the screw body (21) and the heating element (22), and the interior of the gap is filled with heat-conducting liquid (24).

2. The PE pipe extruder with a preheating mechanism according to claim 1, characterized in that: The heating element (22) is externally connected to a fixing frame (23) for supporting and fixing the heating element (22).

3. The PE pipe extruder with a preheating mechanism according to claim 2, characterized in that: The heating element (22) is fixedly connected to one end of the fixing frame (23).

4. The PE pipe extruder with a preheating mechanism according to claim 2, characterized in that: The fixing frame (23) has a cavity inside, which is used to place the connecting wires of the heating element (22) thereon.

5. A PE pipe extruder with a preheating mechanism according to any one of claims 1 to 4, characterized in that: The transmission mechanism (4) comprises a gear 1 (41) connected to the screw body (21), and a gear 2 (42) meshing with the gear 1 (41), and the gear 2 (42) is externally connected to a motor (43).

6. The PE pipe extruder with a preheating mechanism according to claim 1, characterized in that: The heat transfer fluid (24) is heat transfer oil.

7. The PE pipe extruder with a preheating mechanism according to claim 5, characterized in that: The gear one (41) is fixedly connected to the outer wall of the screw body (21) adjacent to one end of the transmission mechanism (4), and the gear one (41) is meshed with the gear two (42).

8. The PE pipe extruder with a preheating mechanism according to claim 7, characterized in that: The second gear (42) is fixedly connected to the rotor of the motor, and the main body of the motor (43) is fixedly connected to the machine body.

Images