Spiral sheath extrusion die and extruder

Abstract

The embodiment of the utility model discloses a spiral sheath extrusion die and an extruder, and relates to the technical field of dies. The spiral sheath extrusion die comprises a body and a discharge port formed in the body, the discharge port comprises a first section, a second section and a third section, the first section is connected with the second section, an included angle is formed between the first section and the second section, the third section is connected with the second section, an included angle is formed between the third section and the second section, and the first section is connected with the second section. According to the rubber sheath, the rubber outlet amount of the two sides is increased when a sheet is extruded, the phenomenon that the thicknesses of the two sides are reduced due to material shrinkage is counteracted, and when the rubber sheath is assembled on a hydraulic hose for protection, the rubber sheath has good coating performance and protectiveness, so that the service life of the sheath is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to mould technical field especially relates to a spiral sheath extrusion die and extruder. BACKGROUND

[0002] The spiral protective sleeve has been widely applied to excavators, loaders, road rollers, pavers, forklifts, cranes, dump trucks and other engineering machinery and injection molding machines. It is mainly installed on the outside of hydraulic rubber pipes, wires and cables and other products. Its function is to enhance the wear resistance, anti-static and anti-ultraviolet performance of internal products such as hydraulic rubber pipes, wires and cables, and to play a safety protection role for internal products such as hydraulic rubber pipes in various harsh environments.

[0003] The domestic spiral protective sleeve forming method is generally suitable for extruding sheet while forming, and the material used is generally PP or PE, and the hard shaft is used to rotate into a spiral shape. Foreign countries generally use HDPE materials, which can resist acid and alkali, organic solvents, and have excellent electrical insulation, can maintain a certain toughness at low temperature, and the cross section is an equal-thickness cross section. The existing technical defects are that when the equal-thickness rectangular cross section extrusion die is used for extrusion and winding, the sheet forming shrinkage is caused by the pressure difference along the thickness direction and the cooling rate difference of the extruded sheet, resulting in a thick middle and thin edges of the protective sleeve cross section. The middle position can meet the design size tolerance range, and the wall thickness of the two edge positions of the protective sleeve is small due to shrinkage, which exceeds the lower tolerance of the design wall thickness size of the protective sleeve. The phenomenon is particularly obvious during the forming process of HDPE materials, which affects the covering and protection of the protective sleeve and reduces the service life of the protective sleeve. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a spiral protective sleeve extrusion die and extruder, which aims to solve the technical problems that when the equal-thickness rectangular cross section extrusion die is used for extrusion and winding, the sheet forming shrinkage is caused by the pressure difference along the thickness direction and the cooling rate difference of the extruded sheet, resulting in a thick middle and thin edges of the protective sleeve cross section. The middle position can meet the design size tolerance range, and the wall thickness of the two edge positions of the protective sleeve is small due to shrinkage, which exceeds the lower tolerance of the design wall thickness size of the protective sleeve. The phenomenon is particularly obvious during the forming process of HDPE materials, which affects the covering and protection of the protective sleeve and reduces the service life of the protective sleeve.

[0005] In a first aspect, the utility model provides a spiral protective sleeve extrusion die, which comprises a body and a discharge port formed on the body, wherein the discharge port comprises a first section, a second section and a third section, the first section is connected with the second section and is arranged at an angle with the second section, and the third section is connected with the second section and is arranged at an angle with the second section.

[0006] In one embodiment, the first segment and the second segment are 8-11 degrees, and the third segment and the second segment are 8-11 degrees.

[0007] In one embodiment, the first segment and the third segment are symmetrically inclined on both sides of the second segment.

[0008] In one embodiment, the discharge port further comprises a fourth segment, a fifth segment and a sixth segment, the fourth segment is connected with the fifth segment and is arranged at an angle with the fifth segment, and the sixth segment is connected with the fifth segment and is arranged at an angle with the fifth segment.

[0009] In one embodiment, the fourth segment and the fifth segment are 3-5 degrees, and the sixth segment and the fifth segment are 3-5 degrees.

[0010] In one embodiment, the fourth segment and the sixth segment are symmetrically inclined on both sides of the fifth segment.

[0011] In one embodiment, the thickness between the first segment and the sixth segment is greater than the thickness between the second segment and the fifth segment by 10-20 percent, and the thickness between the third segment and the fourth segment is greater than the thickness between the second segment and the fifth segment by 10-20 percent.

[0012] In one embodiment, the discharge port further comprises a circular arc segment, and the circular arc segment is provided with a round corner.

[0013] In one embodiment, the diameter of the round corner is 2mm.

[0014] In a second aspect, the utility model also provides an extruder, the extruder includes the spiral sheath extrusion die of any one embodiment.

[0015] The embodiment of the utility model has the following beneficial effects:

[0016] The spiral sheath extrusion die and the extruder have the following advantages: the discharge port of the spiral sheath extrusion die comprises a first segment, a second segment and a third segment, the first segment is connected with the second segment and arranged at an angle with the second segment, the third segment is connected with the second segment and arranged at an angle with the second segment, so that the glue output on both sides of the sheet is increased when the sheet is extruded, the thickness reduction on both sides caused by material shrinkage is offset, when the spiral sheath extrusion die is assembled on the hydraulic hose for protection, good covering and protection are achieved, and the service life of the sheath is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] In which:

[0019] Figure 1 It is a schematic view of the body and the discharge port in the spiral sheath extrusion die in an embodiment.

[0020] Figure 2 It is Figure 1 It is a schematic view of the body in the spiral sheath extrusion die.

[0021] Figure 3 It is a schematic view of the rotation winding of the sheet in an embodiment.

[0022] Reference signs:

[0023] 1, body; 2, discharge port; 21, first section; 22, second section; 23, third section; 24, fourth section; 25, fifth section; 26, sixth section; 27, circular arc section; 3, sheet. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0026] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product of the present application when it is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the present application.

[0027] In addition, if the terms "first", "second" and the like are used herein, these terms are used only for distinguishing between similar elements and do not connote or imply a relative importance.

[0028] It should be noted that the features of the embodiments of the present application can be combined with each other without conflict.

[0029] Please combine Figures 1 to 3 The spiral sheath extrusion die provided by the present application will be described below. The spiral sheath extrusion die is used in an extruder.

[0030] The spiral sheath extrusion die comprises a body 1 and a discharge port 2 formed on the body 1. The discharge port 2 comprises a first section 21, a second section 22 and a third section 23. The first section 21 is connected to the second section 22 and is arranged at an angle with the second section 22. The third section 23 is connected to the second section 22 and is arranged at an angle with the second section 22.

[0031] It can be understood that the discharge port 2 of the spiral sheath extrusion die comprises the first section 21, the second section 22 and the third section 23. The first section 21 is connected to the second section 22 and is arranged at an angle with the second section 22. The third section 23 is connected to the second section 22 and is arranged at an angle with the second section 22. This arrangement increases the amount of glue on both sides of the sheet 3 during extrusion, offsetting the phenomenon of thickness reduction on both sides caused by material shrinkage. When the spiral sheath extrusion die is assembled on a hydraulic hose for protection, it has good covering and protective properties, thereby improving the service life of the sheath.

[0032] In the present embodiment, the angle between the first section 21 and the second section 22 is 8-11 degrees, and the angle between the third section 23 and the second section 22 is 8-11 degrees. The angle between the first section 21 and the second section 22 is 8 degrees, 9 degrees, 10 degrees or 11 degrees. The angle between the third section 23 and the second section 22 is 8 degrees, 9 degrees, 10 degrees or 11 degrees. In this way, the amount of glue on both sides of the sheet 3 during extrusion can be increased.

[0033] Further, the first section 21 and the third section 23 are respectively symmetrical to each other at an upward angle on both sides of the second section 22. The upward angle can be increased or decreased according to the thickness of the product.

[0034] In one embodiment, as shown in Figure 1 The discharge port 2 further comprises a fourth section 24, a fifth section 25 and a sixth section 26. The fourth section 24 is connected to the fifth section 25 and is arranged at an angle with the fifth section 25. The sixth section 26 is connected to the fifth section 25 and is arranged at an angle with the fifth section 25. In this way, the warping phenomenon on both sides caused by material shrinkage can be offset.

[0035] In the embodiment, the included angle between the fourth section 24 and the fifth section 25 is 3-5 degrees, and the included angle between the sixth section 26 and the fifth section 25 is 3-5 degrees. The included angle between the fourth section 24 and the fifth section 25 is 3 degrees, 4 degrees or 5 degrees. The included angle between the sixth section 26 and the fifth section 25 is 3 degrees, 4 degrees or 5 degrees.

[0036] Further, the fourth section 24 and the sixth section 26 are symmetrically inclined on both sides of the fifth section 25. The inclination angle can be increased or decreased according to the thickness of the product.

[0037] In an embodiment, as shown in Figure 1 , the thickness between the first section 21 and the sixth section 26 is greater than the thickness between the second section 22 and the fifth section 25 by 10-20 percent, and the thickness between the third section 23 and the fourth section 24 is greater than the thickness between the second section 22 and the fifth section 25 by 10-20 percent. Specifically, the thickness between the first section 21 and the sixth section 26 is greater than the thickness between the second section 22 and the fifth section 25 by 10-20 percent, which can be determined according to the thickness of the product. The thickness between the third section 23 and the fourth section 24 is greater than the thickness between the second section 22 and the fifth section 25 by 10-20 percent, which can be determined according to the thickness of the product. The above reverse deformation design on both sides of the discharge port 2 can reduce the phenomenon of wall thickness reduction caused by shrinkage during the extrusion molding of the sheet 3.

[0038] In an embodiment, as shown in Figure 1 , the discharge port 2 further comprises a circular arc section 27 with a round corner. In this way, the edges of the extruded product can be prevented from having sharp corners to avoid cutting the operator.

[0039] In the embodiment, the diameter of the round corner is 2mm.

[0040] In an embodiment, as shown in Figure 3 , the sheet 3 extruded by the discharge port 2 in the extrusion die is wound and shaped into a spiral sheath by rotation.

[0041] The utility model also provides an extruder, the extruder includes the spiral sheath extrusion die of any embodiment above.

[0042] It can be understood that the extruder of the utility model uses the spiral sheath extrusion die described above, so that the discharge port 2 of the spiral sheath extrusion die comprises a first section 21, a second section 22 and a third section 23, the first section 21 is connected with the second section 22 and is arranged at an included angle with the second section 22, the third section 23 is connected with the second section 22 and is arranged at an included angle with the second section 22, so that the extruded sheet 3 increases the glue output on both sides, offsets the thickness reduction on both sides caused by material shrinkage, has good covering and protection when assembled in a hydraulic hose for protection, thereby improving the service life of the sheath.

[0043] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not contradict each other, they should be considered to be within the scope of the present specification.

[0044] The above only describes the preferred embodiments of the present application, and of course cannot limit the scope of the present application, therefore, equivalent changes made according to the claims of the present application still belong to the scope covered by the present application.

Claims

1. A spiral jacket extrusion die characterized by, The spiral sheath extrusion die comprises a body, and a discharge port formed on the body, the discharge port comprising a first section, a second section and a third section, the first section being connected with the second section and arranged at an angle with the second section, the third section being connected with the second section and arranged at an angle with the second section.

2. The helical jacket extrusion die of claim 1, wherein, The angle between the first section and the second section is 8-11 degrees, and the angle between the third section and the second section is 8-11 degrees.

3. The helical jacket extrusion die of claim 2, wherein, The first section and the third section are respectively symmetrically arranged at an upward angle on both sides of the second section.

4. The helical jacket extrusion die of claim 2, wherein, The discharge port further comprises a fourth section, a fifth section and a sixth section, the fourth section being connected with the fifth section and arranged at an angle with the fifth section, the sixth section being connected with the fifth section and arranged at an angle with the fifth section.

5. The helical jacket extrusion die of claim 4, wherein, The angle between the fourth section and the fifth section is 3-5 degrees, and the angle between the sixth section and the fifth section is 3-5 degrees.

6. The helical jacket extrusion die of claim 5, wherein, The fourth section and the sixth section are respectively symmetrically arranged at an upward angle on both sides of the fifth section.

7. The helical jacket extrusion die of claim 4 wherein, The thickness between the first section and the sixth section is greater than the thickness between the second section and the fifth section by 10-20 percent, and the thickness between the third section and the fourth section is greater than the thickness between the second section and the fifth section by 10-20 percent.

8. The helical jacket extrusion die of claim 1 wherein, The discharge port further comprises a circular arc section, and the circular arc section is formed with a round corner.

9. The helical jacket extrusion die of claim 8, wherein, The diameter of the round corner is 2 mm.

10. An extruder characterized by, The extruder comprises the spiral sheath extrusion die according to any one of claims 1-9.

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