Extruder for producing MPP electric power protection tube

Abstract

The utility model discloses an extruder for MPP electric power protection tube production, which belongs to the technical field of electric power tube production and comprises an extrusion cylinder I and a forming cylinder, a rotating shaft is rotatably mounted in the extrusion cylinder I, and a spiral blade I is fixedly sleeved on the rotating shaft; according to the utility model, the extrusion cylinder II is additionally arranged in a traditional structure formed by combining the extrusion cylinder I and the forming cylinder, the heating cylinder concentric with the extrusion cylinder II is arranged in the extrusion cylinder II, and the annular extrusion cavity is formed between the heating cylinder and the inner wall of the extrusion cylinder II; a spiral blade II which is fixedly connected with one end part of the spiral blade and is consistent with the spiral direction of the spiral blade II is additionally arranged on the heating cylinder, raw materials are extruded, conveyed and heated in a front stage and a rear stage, the first stage is used for large-space primary heating, the large-particle raw materials are hot-melted into hot melt, and the hot melt is guided into an annular extrusion cavity with a small space; and in the extrusion conveying friction process, the hot melting effect of the raw materials is effectively improved, and the situation that a small amount of particles which are not subjected to sufficient hot melting remain in a hot melt is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of power pipe production, and more specifically to an extruder for producing an MPP power protection pipe. Background Art

[0002] MPP cable protection tube is light, smooth, has low friction resistance, can be hot-melt welded, has excellent electrical insulation, high heat deformation temperature and low-temperature impact performance. A screw extruder is required in the production process of MPP cable protection tube. By heating the screw extruder, the raw materials can be hot-melt transferred and extruded during the transfer process.

[0003] However, the existing extruders only extrude and transmit through a single large space, which can easily cause the raw materials to have insufficient hot melt or uneven hot melt. Especially for large-volume PE pipes, the raw material capacity is larger, which can easily cause incompletely hot-melted particles to be mixed in the hot melt, thereby affecting the pipe molding quality in subsequent extrusion molding.

[0004] To this end, we propose an extruder for the production of MPP power protection pipes to effectively solve some practical problems existing in the prior art. Utility Model Content

[0005] The utility model aims to solve the above-mentioned problems. Compared with the prior art, an extruder for producing MPP power protection tubes is provided. An extrusion tube 2 is added between the traditional structure combining an extrusion tube 1 and a molding tube. The interior of the extrusion tube 2 is provided with a heating tube arranged concentrically therewith. An annular extrusion cavity is formed between the heating tube and the inner wall of the extrusion tube 2. A spiral blade 2 fixedly connected to one end of the spiral blade and consistent with the spiral direction thereof is added to the heating tube. The raw materials are extruded, transported and heated through two stages. The first stage is used for preliminary heating in a large space to heat-melt large-particle raw materials into a hot melt. The hot melt is introduced into the annular extrusion cavity in a small space for secondary extrusion and hot melting. During the extrusion, transportation and friction process, the hot melting effect of the raw materials is effectively improved to avoid a small amount of particles that are not fully melted in the hot melt.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] An extruder for producing an MPP power protection tube, comprising an extrusion barrel 1 and a molding barrel, wherein a rotating shaft is rotatably installed inside the extrusion barrel 1, a spiral blade 1 is fixedly sleeved on the rotating shaft, an extrusion barrel 2 is fixedly connected between the extrusion barrel 1 and the molding barrel, and both left and right ends of the extrusion barrel 2 are fixedly connected to the extrusion barrel 1 and the end of the molding barrel respectively through a conical outer barrel;

[0008] A heating cylinder coaxially arranged therewith is fixedly sleeved inside the second extrusion cylinder, and an end of the heating cylinder away from the first extrusion cylinder is fixedly connected to a conical inner cylinder located inside the conical outer cylinder and matching its shape, and the bottom end of the conical inner cylinder is fixedly installed with the bottom of the second extrusion cylinder through a support, and an annular extrusion cavity is formed between the heating cylinder and the inner wall of the second extrusion cylinder, and a spiral blade second located in the annular extrusion cavity is movably sleeved on the outer wall of the heating cylinder, and an end of the second spiral blade close to the first spiral blade is fixedly connected to it through a connecting assembly, and the spiral direction of the second spiral blade is consistent with that of the first spiral blade.

[0009] Furthermore, the bottom ends of the extrusion tube 1, the forming tube, and the extrusion tube 2 are all fixedly mounted with a support frame, and the lower end of the support member is fixedly mounted on the support frame connected to the extrusion tube 2.

[0010] Furthermore, the support member includes a heating device fixedly connected to the support frame, and a plurality of fixing columns are fixedly connected to the upper end of the heating device. The upper ends of the fixing columns all penetrate the conical outer cylinder and are fixedly connected to the bottom end wall of the conical inner cylinder.

[0011] Furthermore, the heating cylinder is fixedly connected to a material guide spherical surface located on the inner side of the conical outer cylinder at one end away from the conical inner cylinder, and a rotating groove for rotationally docking with the rotating shaft is provided on the material guide spherical surface. By utilizing the fixed installation of the fixed column and the conical inner cylinder, the heating cylinder is suspended inside the extrusion cylinder 2 and arranged concentrically therewith, so that the raw material spirally extruded by the extrusion cylinder 1 is introduced into the annular extrusion cavity through the material guide spherical surface, and then the continuously rotating spiral blade 2 extrude the raw material in the annular extrusion cavity toward one side of the forming cylinder.

[0012] Furthermore, the connecting component includes a connecting belt fixedly connected between the ends of spiral blade one and spiral blade two, and a plurality of reinforcing ribs fixedly connected to the connecting belt are also fixedly connected to the rotating shaft. The connecting belt also has a spiral belt body, and the spiral direction of spiral blade two is consistent with that of spiral blade one. The raw material is initially conveyed and heated in extrusion barrel one to form a hot melt, which is then introduced into the annular extrusion cavity. Under the rotational movement of spiral blade two, the raw material moves along the annular extrusion cavity toward one side of the forming barrel, and the raw material is extruded, transported, heated and hot-melted through two stages. The first stage is used for initial heating in a large space to hot-melt large-particle raw materials into a hot melt. The hot melt is introduced into an annular extrusion cavity in a small space for secondary extrusion and hot-melting. During the extrusion, transportation and friction process, the hot-melting effect of the raw material is effectively improved to prevent a small amount of particles that are not fully hot-melted from remaining in the hot melt.

[0013] Furthermore, the heating cylinder is a hollow cylindrical structure made of heat-conductive material, and a plurality of groups of heating tubes are distributed in a ring inside the heating cylinder. The ends of the plurality of heating tubes close to one side of the conical inner cylinder are connected together with a wire. A slot corresponding to the position of a fixed column in the middle is opened inside the conical inner cylinder, and the wire passes through the slot and the fixed column and is connected to the heating device.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] (1) In this scheme, an extrusion tube 2 is added between the conventional structure of the combination of the extrusion tube 1 and the forming tube. The interior of the extrusion tube 2 is provided with a heating tube arranged concentrically therewith. An annular extrusion chamber is formed between the heating tube and the inner wall of the extrusion tube 2. A spiral blade 2 fixedly connected to one end of the spiral blade and consistent with the spiral direction thereof is added to the heating tube. The raw material is extruded and transported and heated and melted through two stages. The first stage is used for preliminary heating in a large space to melt large particles of the raw material into a hot melt. The hot melt is introduced into the annular extrusion chamber with a small space for secondary extrusion and hot melting, which effectively improves the hot melting effect of the raw material to prevent a small amount of incompletely melted particles from remaining in the hot melt.

[0016] (2) This solution extends the raw material conveying distance and reduces the width gap of the conveying space in the second conveying stage, so as to eliminate the raw material particles that are not fully melted in the hot melt during the extrusion and transportation friction process, thereby improving the quality of pipe extrusion molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the external structure of the utility model;

[0018] Figure 2 It is a cross-sectional view of the junction of the extrusion tube 1 and the extrusion tube 2 of the utility model;

[0019] Figure 3 It is a partial enlarged view of the junction of the spiral blade 1 and the spiral blade 2 of the utility model;

[0020] Figure 4 It is a structural schematic diagram of the junction between the heating cylinder and the spiral blade 2 of the utility model;

[0021] Figure 5 This is an internal cross-sectional view of the heating tube of the present invention.

[0022] Description of the numbers in the figure:

[0023] 1. Extrusion cylinder 1; 2. Forming cylinder; 3. Extrusion cylinder 2; 4. Rotating shaft; 5. Spiral blade 1; 6. Conical outer cylinder; 7. Heating cylinder; 8. Conical inner cylinder; 9. Spiral blade 2; 10. Connecting belt; 11. Reinforcing ribs; 12. Fixed column; 13. Heating device; 14. Heating tube. DETAILED DESCRIPTION

[0024] The following will combine the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the utility model belong to the scope of protection of the utility model.

[0025] Embodiment 1:

[0026] The utility model discloses an extruder for producing MPP power protection pipes. Figure 1 , including an extrusion cylinder 1 and a forming cylinder 2, the upper end of the extrusion cylinder 1 away from the forming cylinder 2 is provided with a feed hopper connected to the inside thereof, a rotating shaft 4 is rotatably installed inside the extrusion cylinder 1, a spiral blade 5 is fixedly sleeved on the rotating shaft 4, and a driving device fixedly connected to the end of the rotating shaft 4 is also installed at its end, which is the basic structure of a traditional extruder;

[0027] An extrusion tube 2 3 is fixedly connected between the extrusion tube 1 and the forming tube 2. The bottom ends of the extrusion tube 1, the forming tube 2 and the extrusion tube 2 3 are fixedly installed with a support frame. The left and right ends of the extrusion tube 2 3 are respectively fixedly connected to the ends of the extrusion tube 1 and the forming tube 2 through a conical outer tube 6;

[0028] See also Figure 2-Figure 4 A heating cylinder 7 coaxially arranged inside the extrusion cylinder 2 3 is fixedly sleeved therein, and one end of the heating cylinder 7 away from the extrusion cylinder 1 is fixedly connected to a conical inner cylinder 8 located inside the conical outer cylinder 6 and matching its shape, and the bottom end of the conical inner cylinder 8 is fixedly installed with the bottom of the extrusion cylinder 2 3 through a support.

[0029] The lower end of the support member is fixedly mounted on a support frame connected to the extrusion cylinder 2 3, and the support member includes a heating device 13 fixedly connected to the support frame, and a plurality of fixed columns 12 are fixedly connected to the upper end of the heating device 13, and the upper ends of the fixed columns 12 all penetrate the conical outer cylinder 6 and are fixedly connected to the bottom end wall of the conical inner cylinder 8.

[0030] An annular extrusion cavity is formed between the heating cylinder 7 and the inner wall of the extrusion cylinder 23. A spiral blade 29 located in the annular extrusion cavity is movably sleeved on the outer wall of the heating cylinder 7. The end of the spiral blade 29 close to the spiral blade 15 is fixedly connected to the spiral blade 15 through a connecting component, and the spiral blade 29 is consistent with the spiral direction of the spiral blade 15. The heating cylinder 7 is a hollow cylindrical structure made of heat-conducting material. Please refer to Figure 5There are multiple groups of heating tubes 14 distributed in an annular shape inside the heating cylinder 7. The ends of the multiple groups of heating tubes 14 close to the conical inner cylinder 8 are connected with wires. A notch corresponding to the position of the fixed column 12 in the middle is opened inside the conical inner cylinder 8. The wire passes through the notch and the fixed column 12 and is connected to the heating device 13. The heating device 13 is used to power the multiple groups of heating tubes 14. After being started, the heating tubes 14 heat the heating cylinder 7. The heating cylinder 7 is made of heat-conducting material. The heat is transferred to the annular extrusion cavity through the heating cylinder 7, thereby performing secondary heating on the raw materials spirally extruded from the annular extrusion cavity.

[0031] The end of the heating cylinder 7 away from the conical inner cylinder 8 is fixedly connected to a material guide spherical surface located on the inner side of the conical outer cylinder 6. A rotating groove for rotationally docking with the rotating shaft 4 is provided on the material guide spherical surface. By utilizing the fixed installation of the fixed column 12 and the conical inner cylinder 8, the heating cylinder 7 is suspended inside the extrusion cylinder 2 3 and arranged concentrically therewith, so that the raw material spirally extruded by the extrusion cylinder 1 is introduced into the annular extrusion cavity through the material guide spherical surface, and then the continuously rotating spiral blade 2 9 extrude the raw material in the annular extrusion cavity toward the side of the forming cylinder 2.

[0032] The connecting component includes a connecting belt 10 fixedly connected between the ends of the spiral blade 1 5 and the spiral blade 2 9. The connecting belt 10 is fixedly connected with a plurality of reinforcing ribs 11 which are also fixedly connected to the rotating shaft 4. The connecting belt 10 is also a spiral belt body. The spiral direction of the spiral blade 2 9 is consistent with that of the spiral blade 1 5. The raw material is initially conveyed and heated in the extrusion barrel 1 to form a hot melt, which is then introduced into the annular extrusion cavity. Under the rotation of the spiral blade 2 9, the raw material moves along the annular extrusion cavity toward one side of the forming barrel 2. The raw material is extruded and transported and heated and hot-melted through two stages. The first stage is used for initial heating in a large space to hot-melt large-particle raw materials into a hot melt. The hot melt is introduced into the annular extrusion cavity in a small space for secondary extrusion and hot-melting. During the extrusion and transportation friction process, the hot-melting effect of the raw material is effectively improved to prevent a small amount of incompletely hot-melted particles from remaining in the hot melt.

[0033] The working process and principle of the utility model are as follows:

[0034] First, the raw material is introduced into the extrusion barrel 1 through the feed hopper installed on the extrusion barrel 1, and then the driving device installed at the end of the extrusion barrel 1 and fixedly installed with the rotating shaft 4 is started, and the rotating shaft 4 drives the spiral blade 1 5 and the spiral blade 2 9 to rotate synchronously, and the raw material is extruded and conveyed in the extrusion barrel 1 and heated into a hot melt;

[0035] The hot melt is introduced into the annular extrusion cavity of the extrusion cylinder 2 3 through the guide spherical surface at the end of the heating cylinder 7, and is extruded toward one side of the forming cylinder 2 along the narrow annular extrusion cavity under the rotation of the spiral blade 2 9. In this process, secondary extrusion hot melting is performed, which prolongs the conveying distance and reduces the width gap of the conveying space. In the process of extrusion and transportation friction, the raw material particles that are not fully melted in the hot melt are worn away;

[0036] After two stages of hot melt, the hot melt is finally pressed into the molding cylinder 2 through the tapered outer cylinder 6 for molding, and the MPP cable product is obtained after cooling.

[0037] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to them. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the utility model according to the technical solution and improved ideas of the utility model, which should be included in the protection scope of the utility model.

Claims

1. An extruder for producing an MPP power protection tube, comprising an extrusion barrel (1) and a molding barrel (2), wherein a rotating shaft (4) is rotatably mounted inside the extrusion barrel (1), and a spiral blade (5) is fixedly sleeved on the rotating shaft (4). Features: An extrusion tube 2 (3) is fixedly connected between the extrusion tube 1 (1) and the forming tube (2), and both left and right ends of the extrusion tube 2 (3) are respectively fixedly connected to the end of the extrusion tube 1 (1) and the forming tube (2) through a conical outer tube (6); A heating cylinder (7) coaxially arranged therewith is fixedly sleeved inside the second extrusion cylinder (3), and an end of the heating cylinder (7) away from the first extrusion cylinder (1) is fixedly connected to a conical inner cylinder (8) located inside the conical outer cylinder (6) and matching its shape, and the bottom end of the conical inner cylinder (8) is fixedly mounted to the bottom of the second extrusion cylinder (3) through a support member, and an annular extrusion cavity is formed between the heating cylinder (7) and the inner wall of the second extrusion cylinder (3), and a spiral blade (9) located in the annular extrusion cavity is movably sleeved on the outer wall of the heating cylinder (7), and the end of the second spiral blade (9) close to the first spiral blade (5) is fixedly connected thereto through a connecting assembly, and the spiral direction of the second spiral blade (9) is consistent with that of the first spiral blade (5).

2. An extruder for producing an MPP power protection tube according to claim 1, Features: The bottom ends of the extrusion tube 1 (1), the forming tube (2) and the extrusion tube 2 (3) are all fixedly mounted with a support frame, and the lower end of the support member is fixedly mounted on the support frame connected to the extrusion tube 2 (3).

3. An extruder for producing an MPP power protection tube according to claim 2, Features: The support member comprises a heating device (13) fixedly connected to the support frame, and a plurality of fixing columns (12) are fixedly connected to the upper end of the heating device (13), and the upper ends of the fixing columns (12) all penetrate the conical outer cylinder (6) and are fixedly connected to the bottom end wall of the conical inner cylinder (8).

4. An extruder for producing an MPP power protection tube according to claim 1, Features: The heating cylinder (7) is fixedly connected to a material guide spherical surface located inside the conical outer cylinder (6) at one end away from the conical inner cylinder (8), and a rotation groove for rotationally docking with the rotating shaft (4) is provided on the material guide spherical surface.

5. An extruder for producing an MPP power protection tube according to claim 1, Features: The connection assembly comprises a connecting belt (10) fixedly connected between the ends of spiral blade one (5) and spiral blade two (9), and a plurality of reinforcing ribs (11) which are also fixedly connected to the rotating shaft (4) are fixedly connected to the connecting belt (10), and the connecting belt (10) is also in the form of a spiral belt body.

6. An extruder for producing an MPP power protection tube according to claim 1, Features: The heating tube (7) is a hollow cylindrical structure made of a heat-conducting material. A plurality of groups of heating tubes (14) are distributed in an annular manner inside the heating tube (7). The ends of the plurality of groups of heating tubes (14) close to one side of the conical inner tube (8) are connected to a conductive wire. A notch corresponding to the position of the fixed column (12) in the middle is provided inside the conical inner tube (8). The conductive wire passes through the notch and the fixed column (12) and is connected to the heating device (13).

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