Double-step extruder for polyolefin cable material production

Abstract

The utility model discloses a double-step extruder for polyolefin cable material production, which relates to the technical field of cable material production and comprises a bottom plate, a supporting seat is mounted at the top of the bottom plate, a first-step processing cylinder is mounted at the top of the supporting seat, and an inner cavity of the first-step processing cylinder is connected with double screws through bearings. A driving assembly is arranged on the right side of the first-order machining barrel, the left end of the driving assembly is connected with the right ends of the double screws, the right end of the top of the first-order machining barrel is connected with a feeding pipe, a feeding barrel is installed at the top of the feeding pipe, a frame is installed at the top of an inner cavity of the feeding barrel, a filter screen is installed in an inner cavity of the frame, and a connecting assembly is arranged between the frame and the feeding barrel. The feeding barrel, the filter screen and the frame body are arranged in a matched mode, so that raw materials can be filtered through the filter screen, impurities in the raw materials are blocked outside, meanwhile, the filter screen and the frame body are convenient to replace through the arrangement of the connecting assembly, and the blocking situation caused by long-term use is avoided as much as possible.

Description

Technical Field

[0001] The utility model relates to the technical field of cable material production, in particular to a double-stage extruder used for the production of polyolefin cable materials. Background Art

[0002] In recent years, with the development of cable flame retardant technology and the strengthening of awareness of wire and cable fire accidents, the requirements for cable flame retardancy have become increasingly higher. Traditional flame retardant cable materials can be roughly divided into three categories: flame retardant PVC cable materials, flame retardant polyolefin cable materials, and flame retardant rubber cable materials. Among them, PVC cable materials have a low temperature resistance grade, emit a large amount of smoke when burned, and produce a lot of acidic toxic gases, which limits their use. The processing technology of flame retardant rubber cable materials is cumbersome and their mechanical properties are poor. Based on the above factors, the use of flame retardant polyolefin cable materials is becoming more and more widespread. Polyolefin cable materials are generally made by extruding plastic masterbatches through an extruder.

[0003] The Chinese utility model patent announcement number CN212445903U discloses a two-stage extrusion device for producing environmentally friendly cable materials, including a twin-screw extruder and a single-screw extruder, the twin-screw extruder and the single-screw extruder are connected by a bending tube, the angle formed by the extension direction of the twin-screw extruder and the extension direction of the single-screw extruder is α, the twin-screw extruder and the single-screw extruder are connected by a bending tube, the bending part of the bending tube is an arc transition, and the bending angle of the bending tube is β, α and β are consistent and are 45-60; the outside of the single-screw extrusion shell and the twin-screw extrusion shell are respectively provided with a heating chamber and a cooling chamber, a temperature sensor is provided in the cooling chamber, and a plurality of evenly distributed heating tubes are provided in the heating chamber. The utility model ensures that the gas is discharged during extrusion while avoiding material overflow, ensuring the extrusion granulation efficiency and product quality, but the above-mentioned extruder cannot filter the raw materials when in use, so that impurities in the raw materials enter the interior of the extruder, thereby reducing the quality of the finished cable. Utility Model Content

[0004] In order to improve the problem that the existing extruders mentioned above cannot filter the raw materials, so that impurities in the raw materials enter the interior of the extruder, thereby reducing the quality of the finished cable products, the utility model provides a two-stage extruder for the production of polyolefin cable materials.

[0005] The utility model provides a two-stage extruder for the production of polyolefin cable materials, which adopts the following technical solutions:

[0006] A two-stage extruder for the production of polyolefin cable materials, comprising a bottom plate, a support seat is installed on the top of the bottom plate, a first-stage processing cylinder is installed on the top of the support seat, the inner cavity of the first-stage processing cylinder is connected to a twin screw through a bearing, a drive assembly is arranged on the right side of the first-stage processing cylinder, the left end of the drive assembly is connected to the right end of the twin screw, a feed pipe is connected to the right end of the top of the first-stage processing cylinder, a feed barrel is installed on the top of the feed pipe, a frame is installed on the top of the inner cavity of the feed barrel, and the frame A filter screen is installed in the inner cavity, a connecting assembly is arranged between the frame and the feed barrel, a mounting seat is installed at the left end of the top of the bottom plate, a second-stage processing barrel is installed on the top of the mounting seat, a discharge pipe is connected to the top of the second-stage processing barrel and the left end of the bottom of the first-stage processing barrel, a single screw is connected to the inner cavity of the second-stage processing barrel through a bearing, a stepper motor for driving the single screw to rotate is installed on the outer side of the second-stage processing barrel, and a discharge pipe is installed at the end of the outer side of the second-stage processing barrel away from the stepper motor.

[0007] By adopting the above technical scheme, raw materials are added to the inside of the feed barrel. When the raw materials pass through the filter screen, the raw materials can be filtered to block impurities in the raw materials. Then the raw materials enter the inner cavity of the first-stage processing barrel. At this time, the twin screws are driven to rotate by the driving component. The raw materials are continuously mixed and extruded to the right inside the first-stage processing barrel, and then discharged into the inner cavity of the second-stage processing barrel through the discharge pipe. At this time, the stepper motor is started. When the stepper motor works, it drives the single screw to rotate, and finally the raw materials are discharged through the discharge pipe. When there are a lot of impurities accumulated above the filter screen, the filter screen and the frame can be conveniently removed from the inner cavity of the feed barrel through the connecting component for cleaning or replacement, so as to avoid blockage during long-term use, thereby improving the practicality of the extruder.

[0008] Optionally, the drive assembly includes a shell, which is installed on the right side of the first-stage processing cylinder, and a drive motor is installed on the right side wall of the shell inner cavity, and a driving shaft is installed at the power output end of the drive motor, and a driving pulley is sleeved on the outer wall of the driving shaft. The end of the shell inner cavity away from the driving shaft is connected to a driven shaft through a bearing, and a driven pulley is sleeved on the outer wall of the driven shaft. Connecting belts are arranged outside the driven pulley and the driving pulley, and the left ends of the driven shaft and the driving shaft are respectively fixedly connected to the right end of the twin screw.

[0009] By adopting the above technical solution, when the driving motor is working, the driving shaft drives the driving pulley to rotate, the driving pulley rotates through the connecting belt to drive the driven pulley to rotate, the driven pulley rotates to drive the driven shaft to rotate, and then can drive the twin screws to rotate to mix the raw materials evenly.

[0010] Optionally, guide plates are obliquely installed at both ends of the bottom of the inner cavity of the feed barrel, and the lower ends of the two groups of guide plates are fixedly connected to the feed pipe.

[0011] By adopting the above technical solution, the raw material is guided by the material guide plate, so that the raw material can quickly enter the inner cavity of the first-stage processing cylinder.

[0012] Optionally, the connection assembly includes two groups of protrusions, and the two groups of protrusions are respectively installed at two ends of the bottom of the frame body, and groove bodies that are plug-matched with the protrusions are installed on both sides of the inner cavity of the feeding barrel.

[0013] By adopting the above technical solution, when the frame needs to be disassembled, the frame is pulled up, and the frame drives the protrusion to move upward until the protrusion is separated from the groove body.

[0014] Optionally, both ends of the top of the frame are connected with pull rods.

[0015] By adopting the above technical solution, it is convenient for the staff to hold the pull rod and pull the frame upwards.

[0016] Optionally, bolts are threadedly connected between the discharge pipe and the second-stage processing cylinder.

[0017] By adopting the above technical solution, the discharge pipe can be easily disassembled and replaced by bolts.

[0018] Optionally, the twin screws are high-speed co-rotating parallel twin screws, the single screw is a low-speed single screw, and the first-stage processing barrel and the second-stage processing barrel are arranged vertically and orthogonally.

[0019] By adopting the above technical solution, the twin screws can achieve better mixing by running at high speed, and the single screw can avoid excessive shear force by running at low speed, thereby effectively improving the processing effect of the extruder.

[0020] In summary, the present invention has at least one of the following beneficial effects:

[0021] (1) Through the coordinated arrangement of the feed barrel, the filter screen and the frame, the raw materials can be filtered through the filter screen to block impurities in the raw materials. At the same time, through the arrangement of the connecting components, it is also convenient to replace the filter screen and the frame to avoid blockage during long-term use.

[0022] (2) Through the coordinated setting of the first-stage processing barrel, twin screws and drive assembly, the twin screws can achieve better mixing by running at high speed. Through the coordinated setting of the second-stage processing barrel, single screw and stepper motor, the single screw can avoid excessive shear force by running at low speed, thereby effectively improving the processing effect of the extruder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a cross-sectional structural schematic diagram of the utility model;

[0025] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0026] Figure 3 For the utility model Figure 1 Schematic diagram of the structure at A in the middle;

[0027] Figure 4 For the utility model Figure 1 Schematic diagram of the structure at point B in the middle.

[0028] In the figure: 1. first-stage processing cylinder; 2. double screw; 3. support seat; 4. discharge pipe; 5. second-stage processing cylinder; 6. single screw; 7. mounting seat; 8. bottom plate; 9. driving assembly; 901. driven pulley; 902. driven shaft; 903. shell; 904. connecting belt; 905. driving pulley; 906. driving shaft; 907. driving motor; 10. feeding pipe; 11. guide plate; 12. feeding cylinder; 13. discharging pipe; 14. bolt; 15. stepping motor; 16. filter screen; 17. frame; 18. pull rod; 19. connecting assembly; 1901. bump; 1902. groove body. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 The utility model is described in further detail.

[0030] Please refer to the attached figure in the instruction manual Figure 1 and Figure 3The utility model provides an embodiment: a two-stage extruder for the production of polyolefin cable materials, comprising a bottom plate 8, a support seat 3 is installed on the top of the bottom plate 8, a first-stage processing cylinder 1 is fixedly installed on the top of the support seat 3, the inner cavity of the first-stage processing cylinder 1 is rotatably connected with a twin screw 2 through a bearing, a drive assembly 9 is arranged on the right side of the first-stage processing cylinder 1, the left end of the drive assembly 9 is connected to the right end of the twin screw 2, the drive assembly 9 includes a shell 903, the shell 903 is installed on the right side of the first-stage processing cylinder 1, and the shell 903 is inside A driving motor 907 is installed on the right wall of the cavity, and a driving shaft 906 is installed on the power output end of the driving motor 907. A driving pulley 905 is sleeved on the outer wall of the driving shaft 906. The end of the inner cavity of the shell 903 away from the driving shaft 906 is rotatably connected to a driven shaft 902 through a bearing. A driven pulley 901 is sleeved on the outer wall of the driven shaft 902. A connecting belt 904 is arranged outside the driven pulley 901 and the driving pulley 905. The left ends of the driven shaft 902 and the driving shaft 906 are respectively fixedly connected to the right end of the twin screw 2. When the driving motor 907 is working, the driving pulley 905 is driven to rotate through the driving shaft 906. The driving pulley 905 rotates and drives the driven pulley 901 to rotate through the connecting belt 904. The driven pulley 901 rotates and drives the driven shaft 902 to rotate, which can then drive the twin screw 2 to rotate to mix the raw materials evenly.

[0031] Please refer to the attached figure in the instruction manual Figure 1 The right end of the top of the first-stage processing cylinder 1 is fixedly connected with a feed pipe 10, and a feed cylinder 12 is fixedly installed on the top of the feed pipe 10. Both ends of the bottom of the inner cavity of the feed cylinder 12 are obliquely installed with guide plates 11, and the lower ends of the two sets of guide plates 11 are fixedly connected to the feed pipe 10. The guide plates 11 guide the raw materials so that the raw materials can quickly enter the inner cavity of the first-stage processing cylinder 1.

[0032] Please refer to the attached figure in the instruction manual Figure 1 and Figure 4 , a frame 17 is installed on the top of the inner cavity of the feed barrel 12, a filter screen 16 is installed in the inner cavity of the frame 17, a connecting assembly 19 is arranged between the frame 17 and the feed barrel 12, and the connecting assembly 19 includes two groups of protrusions 1901, and the two groups of protrusions 1901 are respectively fixedly installed at the two ends of the bottom of the frame 17, and groove bodies 1902 that are plugged and matched with the protrusions 1901 are installed on both sides of the inner cavity of the feed barrel 12. When it is necessary to disassemble the frame 17, pull up the frame 17, and the frame 17 drives the protrusions 1901 to move up until the protrusions 1901 are separated from the groove bodies 1902. Both ends of the top of the frame 17 are connected to pull rods 18. It is convenient for the staff to hold the pull rod 18 to pull the frame 17 upward.

[0033] Please refer to the attached figure in the instruction manual Figure 1 and Figure 2The left end of the top of the bottom plate 8 is fixedly mounted with a mounting seat 7, the top of the mounting seat 7 is mounted with a second-stage processing barrel 5, the top of the second-stage processing barrel 5 and the left end of the bottom of the first-stage processing barrel 1 are connected with a discharge pipe 4, the inner cavity of the second-stage processing barrel 5 is rotatably connected with a single screw 6 through a bearing, the twin screw 2 is a high-speed co-directional parallel twin screw, the single screw 6 is a low-speed single screw, and the first-stage processing barrel 1 and the second-stage processing barrel 5 are arranged vertically and orthogonally. The twin screw 2 is operated at a high speed to obtain better mixing, and the single screw 6 is operated at a low speed to avoid excessive shear force, which effectively improves the processing effect of the extruder.

[0034] Please refer to the attached figure in the instruction manual Figure 1 and Figure 2 A stepper motor 15 for driving the single screw 6 to rotate is installed on the outer side of the second-stage processing cylinder 5, and a discharge pipe 13 is installed on the outer side of the second-stage processing cylinder 5 away from the stepper motor 15. A bolt 14 is screwed between the discharge pipe 13 and the second-stage processing cylinder 5. The bolt 14 is convenient for disassembly and replacement of the discharge pipe 13.

[0035] Working principle: When the extruder is used, an external power supply is connected to add raw materials into the feed barrel 12. When the raw materials pass through the filter screen 16, the raw materials can be filtered to block impurities in the raw materials. Then, the raw materials enter the inner cavity of the first-stage processing barrel 1 through the feed pipe 10 under the guidance of the guide plate 11. At this time, the drive motor 907 is started. When the drive motor 907 is working, it drives the driving pulley 905 to rotate through the driving shaft 906. The driving pulley 905 rotates and drives the driven pulley 901 to rotate through the connecting belt 904. The rotation of the driven pulley 901 drives the driven shaft 902 to rotate, which in turn drives the twin screw 2 to rotate. The raw material is continuously mixed inside the first-stage processing barrel 1 and extruded to the right, and then discharged into the inner cavity of the second-stage processing barrel 5 through the discharge pipe 4. At this time, the stepper motor 15 is started. When the stepper motor 15 works, it drives the single screw 6 to rotate, and finally the raw material is discharged through the discharge pipe 13. The twin screw 2 can obtain better mixing by running at high speed, and the single screw 6 can avoid excessive shear force by running at low speed, thereby effectively improving the processing effect of the extruder.

[0036] When there are a lot of impurities accumulated above the filter screen 16, the staff pulls the pull rod 18 upward, and the upward movement of the pull rod 18 drives the frame 17 upward, and the upward movement of the frame 17 drives the protrusion 1901 upward until the protrusion 1901 is separated from the groove body 1902, thereby facilitating the removal of the filter screen 16 and the frame 17 from the inner cavity of the feed barrel 12 for cleaning or replacement, thereby avoiding blockage during long-term use as much as possible, thereby improving the practicality of the extruder.

[0037] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A two-stage extruder for the production of polyolefin cable materials, comprising a bottom plate (8), characterized in that: A support seat (3) is installed on the top of the bottom plate (8), a first-stage processing cylinder (1) is installed on the top of the support seat (3), the inner cavity of the first-stage processing cylinder (1) is connected to a twin screw (2) via a bearing, a drive assembly (9) is arranged on the right side of the first-stage processing cylinder (1), the left end of the drive assembly (9) is connected to the right end of the twin screw (2), a feed pipe (10) is connected to the right end of the top of the first-stage processing cylinder (1), a feed cylinder (12) is installed on the top of the feed pipe (10), a frame (17) is installed on the top of the inner cavity of the feed cylinder (12), a filter screen (16) is installed in the inner cavity of the frame (17), and the filter screen (16) is installed in the inner cavity of the frame (17). A connecting assembly (19) is provided between the frame (17) and the feed barrel (12); a mounting seat (7) is installed at the left end of the top of the bottom plate (8); a second-stage processing barrel (5) is installed at the top of the mounting seat (7); a discharge pipe (4) is connected between the top of the second-stage processing barrel (5) and the left end of the bottom of the first-stage processing barrel (1); a single screw (6) is connected to the inner cavity of the second-stage processing barrel (5) via a bearing; a stepping motor (15) for driving the single screw (6) to rotate is installed on the outer side of the second-stage processing barrel (5); and a discharge pipe (13) is installed at the end of the outer side of the second-stage processing barrel (5) away from the stepping motor (15).

2. A two-stage extruder for the production of polyolefin cable materials according to claim 1, characterized in that: The driving assembly (9) comprises a shell (903), wherein the shell (903) is mounted on the right side of the first-stage processing cylinder (1), a driving motor (907) is mounted on the right side wall of the inner cavity of the shell (903), a driving shaft (906) is mounted on the power output end of the driving motor (907), a driving pulley (905) is sleeved on the outer wall of the driving shaft (906), a driven shaft (902) is connected to the end of the inner cavity of the shell (903) away from the driving shaft (906) via a bearing, a driven pulley (901) is sleeved on the outer wall of the driven shaft (902), a connecting belt (904) is arranged outside the driven pulley (901) and the driving pulley (905), and the left ends of the driven shaft (902) and the driving shaft (906) are respectively fixedly connected to the right end of the twin screw (2).

3. A two-stage extruder for the production of polyolefin cable materials according to claim 1, characterized in that: Both ends of the bottom of the inner cavity of the feed barrel (12) are obliquely mounted with material guide plates (11), and the lower ends of the two sets of material guide plates (11) are fixedly connected to the feed pipe (10).

4. A two-stage extruder for the production of polyolefin cable materials according to claim 1, characterized in that: The connection assembly (19) comprises two groups of protrusions (1901), the two groups of protrusions (1901) being respectively mounted at two ends of the bottom of the frame (17), and groove bodies (1902) which are plugged and matched with the protrusions (1901) are mounted on both sides of the inner cavity of the feed barrel (12).

5. A two-stage extruder for the production of polyolefin cable materials according to claim 1, characterized in that: Both ends of the top of the frame (17) are connected to pull rods (18).

6. A two-stage extruder for the production of polyolefin cable materials according to claim 1, characterized in that: A bolt (14) is screwed between the discharge pipe (13) and the second-stage processing cylinder (5).

7. A two-stage extruder for the production of polyolefin cable materials according to claim 1, characterized in that: The twin screws (2) are high-speed co-rotating parallel twin screws, the single screw (6) is a low-speed single screw, and the first-stage processing barrel (1) and the second-stage processing barrel (5) are arranged vertically and orthogonally.

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