A LFT-D screw disassembly auxiliary device

Abstract

The utility model discloses a kind of LFT-D screw dismounting auxiliary devices, which is provided with lifting frame on the upper portion of rack, screw support roller is provided on lifting frame, screw support roller is at least provided with two rows from top to bottom, wherein each row of screw support roller is provided with more than two, at least one of the screw support roller in lower row is driving roller;Lifting drive device is provided between rack and lifting frame, vertical movement of lifting frame is realized by lifting drive device;This design is convenient for LFT-D extruder screw dismounting, the device can provide power when screw dismounting and mounting, and the limiting effect can prevent screw deviation, save labor, improve installation efficiency, the device height is adjustable, suitable for multiple groups of machine screw, practicality is strong, simple operation, safe and effective, suitable for wide range of popularization.

Description

Technical Field

[0001] This utility model relates to the field of modified plastic processing equipment, and in particular to an LFT-D screw disassembly and assembly auxiliary device. Background Technology

[0002] LFT-D is an online compression molding technology for long fiber reinforced thermoplastic materials. This process consists of a two-stage twin-screw extruder and a material insulation and conveying device. The first-stage twin-screw extruder is used for melt mixing of the base plastic, and it has a conventional length-to-diameter ratio (40:1). The base plastic and continuous fibers, melt-mixed in the first-stage twin-screw extruder, are simultaneously added to the second-stage twin-screw extruder. The second-stage twin-screw extruder is mainly used for shearing the continuous fibers to a fixed length, mixing the base plastic and long fibers, dispersing the long fibers, and extruding through the die. The second-stage twin-screw extruder typically has a short length-to-diameter ratio (20:1).

[0003] Compared to first-stage twin-screw extruders, second-stage twin-screw extruders experience more wear and tear on their threaded components due to factors such as continuous fiber shearing, mixing of matrix plastics and long fibers, prolonged operating friction, and the presence of moisture, air, and oxygen within the barrel. These factors necessitate periodic replacement of the threaded components.

[0004] The screw outer diameter of a two-stage twin-screw extruder is typically 75–85 mm, resulting in a total screw length of approximately 1550 mm to 1700 mm. In existing technology, replacing the screw in a two-stage twin-screw extruder requires moving the rear-end material insulation conveyor belt to one side and disassembling and rotating the die and cutter to the other side. These factors result in insufficient space for screw disassembly and installation, making installation more difficult than with screws in conventional extruders. When installing threaded components, multiple disassembly and reassembly adjustments are required, and the limited space further complicates this process. The screw's weight also adds to the operator's workload.

[0005] Furthermore, during the disassembly and installation of the second-stage screw, there is no supporting force after it exits the die, making it extremely prone to deformation. Additionally, during disassembly and installation, because residual material inside the screw extruder cannot be completely cleaned, the resistance is significant when the screw is pulled out. Currently, it is only manually pulled out and inserted, which is time-consuming and labor-intensive. Utility Model Content

[0006] To overcome the shortcomings of existing technology, this utility model discloses an LFT-D screw disassembly and assembly auxiliary device. Its purpose is to provide support for the second-order screw during disassembly and assembly by setting up a device, and then to apply auxiliary force to the second-order screw during the disassembly process through a drive device set on the auxiliary device.

[0007] The technical solution adopted by this utility model to solve its technical problem is: an LFT-D screw disassembly and assembly auxiliary device, which includes a frame, a lifting frame is provided on the upper part of the frame, and screw support rollers are provided on the lifting frame. The screw support rollers are arranged in at least two rows, with two or more rollers in each row. At least one of the screw support rollers in the lower row is a drive roller. A lifting drive device is provided between the frame and the lifting frame, and the vertical movement of the lifting frame is realized by the lifting drive device.

[0008] The screw support roller is provided with a positioning groove, and a central retaining ring is provided in the positioning groove. It can simultaneously support and limit the two second-order screws through a single screw support roller.

[0009] The frame is constructed of profiles and includes multiple columns. Each column has a through hole at its center. A vertical rod is installed on the lifting frame and inserted into the through hole. Under the drive of an external vertical force, the lifting frame can move vertically.

[0010] The column is vertically provided with an oil injection hole, which connects the through hole to the outside. When the vertical rod is inserted into the through hole, lubricating oil can be added through the oil injection hole.

[0011] The lifting drive device includes a drive cylinder or a rocker drive assembly. The rocker drive assembly includes a lead screw and several lead screw fixing seats. A lead screw nut is provided on the lead screw, and a swing arm is fixed on the lead screw nut. The top of the swing arm is hinged to the lifting frame, and the lead screw fixing seats are provided on the frame. The lead screw is connected to the drive end.

[0012] The lower row of screw support rollers consists of three rollers, one of which is a drive roller; the upper row of screw support rollers consists of two rollers, and a gap is provided between the upper and lower rows of screw support rollers to achieve screw clamping and driving.

[0013] The present invention, with the above-described structural configuration, has the following advantages compared to the prior art: A lifting frame is provided on the upper part of the frame, and screw support rollers are provided on the lifting frame. The screw support rollers are arranged in at least two rows, with two or more rollers in each row, and at least one of the lower row screw support rollers is a drive roller. A lifting drive device is provided between the frame and the lifting frame, enabling the vertical movement of the lifting frame. This design facilitates the assembly and disassembly of the LFT-D extruder screw. This device provides power for screw assembly and disassembly, and its limiting function prevents screw deviation, saves labor, and improves installation efficiency. The device is height-adjustable, suitable for multiple sets of extruder screws, highly practical, simple to operate, safe and effective, and suitable for widespread promotion. Attached Figure Description

[0014] Figure 1 : A three-dimensional structural schematic diagram of this utility model;

[0015] Figure 2 : Side view structural schematic diagram of this utility model;

[0016] Figure 3 : Figure 1 Enlarged schematic diagram of the structure of region A in the middle;

[0017] Figure 4 : A schematic diagram of the working structure of this utility model;

[0018] In the diagram: 1. Frame, 10. Column, 11. Oil injection hole, 2. Lifting frame, 20. Vertical rod, 21. Crossbeam, 22. Top support frame, 3. Driven roller, 32. Locking point, 4. Drive roller, 40. Drive handwheel, 41. Lower positioning groove, 42. Middle retaining ring, 5. Upper screw support roller, 51. Upper positioning groove, 6. Rocker drive assembly, 60. Lead screw, 61. Lead screw handwheel, 62. Lead screw fixing seat, 63. Lead screw nut, 64. Moving shaft, 65. Swing arm, 7. Extruder, 8. Second-stage screw. Detailed Implementation

[0019] The present invention will be described in detail below through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. However, it should be noted that the specific embodiments described below do not limit the technical solution. Those skilled in the art can make further technical extensions under the guidance of the following technical solutions. The scope of protection of this patent application is determined by the claims.

[0020] Example 1: Combined with Appendix Figure 1 , 2 As shown, an LFT-D screw assembly / disassembly auxiliary device includes a frame 1, which is made of profile and includes four columns 10, each with a vertical through hole at its center. A lifting frame 2 is mounted on the upper part of the frame 1, and vertical rods 20 on the lifting frame 2 are inserted into the through holes, allowing the lifting frame 2 to move vertically under the drive of an external vertical force. Further, as... Figure 3 As shown, the column 10 is vertically provided with an oil injection hole 11, which connects the through hole to the outside. When the vertical rod 20 is inserted into the through hole, lubricating oil can be added through the oil injection hole 11. When the lifting frame 2 moves vertically within the frame 1, the lubrication efficiency can be improved by the lubricating oil.

[0021] The lifting frame 2 is equipped with screw support rollers, which are arranged in two rows, with two or more rollers in each row. In this embodiment, the lower row of screw support rollers is directly fixed to the crossbeam 21 at the top of the lifting frame 2. To improve the overall strength, a crossbeam 21 is also provided in the middle of the lifting frame 2. There are three screw support rollers in the lower row, of which the two closest to the extruder 7 are driven rollers 3, and the other is a drive roller 4. A top support frame 22 is also provided on the crossbeam 21 at the top of the lifting frame 2. The top support frame 22 supports and fixes the two upper row screw support rollers 5. When the present invention is running, the driven second-order screw 8 is clamped between the lower row of screw support rollers and the upper row of screw support rollers 5. The clamping and driving of the second-order screw 8 is achieved through the gap between the upper and lower rows of screw support rollers. To further ensure stability when driving or conveying the second-order screws 8, both the driven roller 3 and the driving roller 4 are provided with lower positioning grooves 41, and the upper screw support roller 5 is provided with upper positioning grooves 51. Furthermore, the driven roller 3 and the driving roller 4 are also provided with a middle retaining ring 42 in the middle of the lower positioning groove 41. The middle retaining ring 42 divides the lower positioning groove 41 into two, which can realize the interval driving and conveying of the two second-order screws 8.

[0022] This utility model also provides a lifting drive device between the frame 1 and the lifting frame 2, which enables the vertical movement of the lifting frame.

[0023] The lifting drive device includes a drive cylinder or a rocker drive assembly 6. When a drive cylinder is used, the drive cylinder can be fixed between the frame 1 and the lifting frame 2, and the two can be engaged or disengaged by driving the drive cylinder.

[0024] like Figure 1 As shown, the rocker drive assembly 6 includes a lead screw 60 and three lead screw fixing seats 62. Two lead screw nuts 63 are provided on the lead screw 60, and two swing arms 65 are fixed to each lead screw nut 63 via a moving shaft 64. The top of each swing arm 65 is hinged to the lifting frame 2. The lead screw fixing seats 62 are mounted on the frame 1. The lead screw 60 is connected to an external drive end; in this embodiment, the drive end is a lead screw handwheel 61. The user can vertically raise and lower the entire lifting frame 2 within the frame 1 by tightening the lead screw handwheel 61. The simultaneous vertical raising and lowering of the lifting frame 2 within the frame 1 is achieved by the two lead screw nuts 63 spaced back and forth, improving the stability of the lifting drive. This drive method can adjust the relative height between the LFT-D screw disassembly and assembly auxiliary device and the extruder 7 to adapt to different models of extruder 7.

[0025] Example 2: The specific steps of this utility model in actual use are as follows:

[0026] (1) After the material in the extruder 7 is completely extruded, move the rear material insulation conveyor belt to one side, disassemble the die head and cutter and rotate them to one side, install the head removal wrench on the head of the second-stage screw 8, open the connection between the second-stage screw 8 and the extruder 7, and prepare for the disassembly of the second-stage screw 8.

[0027] (2) Move the base of this device to a fixed position close to the barrel of the extruder 7;

[0028] (3) Manually rotate the screw handwheel 61 of the height adjustment device. At this time, the screw 60 drives the swing arm 65 through the moving shaft 64, thereby adjusting the working height of the lifting frame 2. When the required height is reached, the second-stage screw 8 is pulled out.

[0029] (4) Pull the second-order screw 8 out slowly by pulling it with a wrench. At this time, the second-order screw 8 slowly receives the lower positioning groove 41 on the driven roller 3 and the drive roller 4. When the second-order screw 8 reaches the drive roller 4, manually rotate the drive roller 4 to provide auxiliary power for the extraction of the second-order screw 8. The lower positioning groove 41 and the middle retaining ring 42 can prevent the second-order screw 8 from running off course or misaligning.

[0030] (5) When the second-stage screw 8 is completely pulled out, manually move the second-stage screw 8 to the external wooden tray to replace the threaded components and clean and maintain the screw. After the screw is installed, cleaned and maintained, prepare to install the screw.

[0031] (6) When the second-order screw 8 is manually inserted into the middle retaining ring 42 on the lower positioning groove 41, the driving roller 4 is manually rotated to provide auxiliary power for the installation and insertion of the second-order screw 8. At the same time, when the manual push is made, it provides a support surface for the installation of the second-order screw 8, which saves manpower, improves installation accuracy, and improves installation efficiency.

[0032] (7) When installing the second-stage screw 8, since there is material inside the extruder 7, it is often necessary to adjust it multiple times and pull it out and insert it multiple times to remove the material. This device can provide a support surface and auxiliary power for this type of adjustment, thereby improving the efficiency of adjustment. After the second-stage screw 8 is installed in place, install the connecting parts of the extruder 7, install the die head and cutter, and complete the disassembly, assembly and maintenance work of the second-stage screw 8.

[0033] This device enables easy assembly and disassembly of the LFT-D extruder screw. The combination of the second-stage screw 8 limiting device and the second-stage screw 8 support device provides power for disassembly and installation, while the limiting function prevents the second-stage screw 8 from deviating. It is suitable for multiple adjustments during the installation of the second-stage screw 8. Its height adjustment device, integrated with the base, allows for height adjustment, making it suitable for different extrusion units and highly adaptable. This device is simple to operate, safe, effective, practical, easy to manufacture, cost-effective, and highly functional.

Claims

1. An auxiliary device for disassembling and assembling an LFT-D screw, characterized in that: It includes a frame, with a lifting frame on the upper part of the frame, and screw support rollers on the lifting frame. The screw support rollers are arranged in at least two rows, with two or more rollers in each row. At least one of the screw support rollers in the lower row is a drive roller. A lifting drive device is provided between the frame and the lifting frame to realize the vertical movement of the lifting frame.

2. The LFT-D screw disassembly and assembly auxiliary device according to claim 1, characterized in that: The screw support roller is provided with a positioning groove, and a central retaining ring is provided in the positioning groove. It can simultaneously support and limit the two second-order screws through a single screw support roller.

3. The LFT-D screw disassembly and assembly auxiliary device according to claim 1, characterized in that: The frame is constructed of profiles and includes multiple columns. Each column has a through hole at its center. A vertical rod is installed on the lifting frame and inserted into the through hole. Under the drive of an external vertical force, the lifting frame can move vertically.

4. The LFT-D screw disassembly and assembly auxiliary device according to claim 1, characterized in that: The column is vertically equipped with an oil injection hole, which connects the through hole to the outside. When the vertical rod is inserted into the through hole, lubricating oil can be added through the oil injection hole.

5. The LFT-D screw disassembly and assembly auxiliary device according to claim 1, characterized in that: The lifting drive device includes a drive cylinder or a rocker drive assembly. The rocker drive assembly includes a lead screw and several lead screw fixing seats. A lead screw nut is provided on the lead screw, and a swing arm is fixed on the lead screw nut. The top of the swing arm is hinged to the lifting frame, and the lead screw fixing seats are provided on the frame. The lead screw is connected to the drive end.

6. The LFT-D screw disassembly and assembly auxiliary device according to claim 1, characterized in that: The lower row of screw support rollers consists of three rollers, one of which is a drive roller; the upper row of screw support rollers consists of two rollers, and a gap is provided between the upper and lower rows of screw support rollers to achieve screw clamping and driving.

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