Roller device for elastic modification of PVC injection shoe material

Abstract

The application discloses a PVC injection shoe material elastic modification rolling device, which comprises roller frame mounting grooves, and extrusion roller groups are arranged between the roller frame mounting grooves; the extrusion roller groups comprise heating rollers and auxiliary pressure rollers, the two heating rollers are oppositely arranged, the auxiliary pressure roller is arranged on one side of the middle position of the two heating rollers, and a cutter group is arranged above the auxiliary pressure roller; two-stage rolling is adopted, dispersion is more uniform, a main rolling area formed by the "main heating roller-main heating roller" and a secondary rolling area formed by the "heating roller-auxiliary pressure roller" are arranged, and materials sequentially undergo high-strength shearing and secondary refining, so that the materials are more sufficient and controlled, mutual penetration, fusion and dispersion of PVC resins and elastomers and other additives are greatly promoted, elastomer phases are more likely to form a continuous and uniform network structure, and the elasticity index of shoe materials is obviously improved.

Description

Technical Field

[0001] This application relates to the field of PVC injection molded shoe material modification technology, specifically a roller pressing device for elasticity modification of PVC injection molded shoe materials. Background Technology

[0002] Elasticity modification of PVC footwear materials has become a standard practice in the industry. This is typically achieved by adding high-molecular-weight elastomers (such as thermoplastic polyurethane (TPU) and styrene-butadiene rubber) and plasticizers to the PVC resin through blending modification to enhance its elasticity. Currently, the preparation of PVC / elastomer blends mainly relies on a two-step method: first, preliminary melt blending is performed using an internal mixer or Banbury mixer; then, the mixed agglomerated material is transferred to an open mill or twin-roll calender for further plasticization and sheet formation.

[0003] While internal mixers can achieve preliminary mixing, their effectiveness in forming uniformly dispersed or co-continuous structures at the microscale is limited, easily leading to uneven material properties after modification. In traditional open milling or calendering processes, the adjustment precision of the roller gap (roller clearance) is insufficient and it is difficult to maintain absolute stability during pressing, directly affecting the sheet thickness and the uniformity of pressure.

[0004] During the mixing and repeated rolling processes, the material is prone to localized overheating due to prolonged or excessive shearing, which can cause PVC molecular chains to break or elastomer properties to deteriorate, ultimately affecting the quality of the final product. After being rolled into sheets, manual labor or additional equipment is usually required for cutting, unrolling, and rewinding. This separation of processes not only increases labor intensity but also affects production efficiency and continuity. Summary of the Invention

[0005] The technical problem to be solved by this application is to overcome the existing defects and provide a roller pressing device for elastic modification of PVC injection molded shoe materials, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a roller pressing device for elastic modification of PVC injection molded shoe material, comprising a roller frame mounting groove, wherein an extrusion roller group is arranged between the roller frame mounting groove;

[0007] The extrusion roller assembly includes a heating roller and an auxiliary pressure roller. The two heating rollers are arranged opposite each other, and the auxiliary pressure roller is located on one side of the middle position of the two heating rollers. A cutter assembly is arranged above the auxiliary pressure roller.

[0008] The cutter assembly includes a transverse movement assembly, a cutter, and a scraper. The cutter is mounted on the transverse movement assembly via a connector, and the scraper is mounted on the rear side of the cutter. The scraper is mounted on a support connector in the transverse movement assembly.

[0009] As a preferred technical solution of this application, the extrusion roller group further includes a drive assembly, which includes a drive motor and a transmission assembly. The end of the drive motor is provided with a drive gear, which meshes with the transmission assembly.

[0010] As a preferred embodiment of this application, the transmission assembly includes a driven gear and a transmission gear, wherein the driven gear is disposed at the end of the heating roller and the transmission gear is disposed at the end of the auxiliary pressure roller.

[0011] As a preferred technical solution of this application, an auxiliary roller bracket is rotatably provided on the upper surface of the roller frame mounting groove, one of the heating rollers is provided between the auxiliary roller brackets, and an adjustment group for adjusting the distance between the two heating rollers is provided on one side of the auxiliary roller bracket.

[0012] As a preferred technical solution of this application, the adjustment group includes a support connecting shaft, an upper connecting frame, a threaded shaft, and a lower connecting frame. The support connecting shaft is disposed on one side of the auxiliary roller support, and the upper connecting frame and the lower connecting frame are disposed on the side of the roller frame mounting groove. The threaded shaft passes through the upper connecting frame and the lower connecting frame and is rotatably connected to the through hole in the support connecting shaft. The threaded shaft is provided with a threaded section, which is screwed into the threaded hole on the upper connecting frame.

[0013] As a preferred technical solution of this application, a notch is provided on one side of the auxiliary roller bracket, a locking block is provided at the end of the notch, a rotary connecting seat is provided on the locking block, the rotary connecting seat is threaded into the threaded hole of the locking block, an intermediate connecting seat is connected to the end of the rotary connecting seat, and the intermediate connecting seat is connected to the bracket connecting seat sleeved on the end of the auxiliary pressure roller.

[0014] As a preferred technical solution of this application, both ends of the intermediate connecting seat are provided with threaded holes, and the threads in the threaded holes are rotated in opposite directions.

[0015] Compared with existing technologies, the beneficial effects of this application are as follows: This application adopts a two-stage compaction process, resulting in more uniform dispersion. By setting up a main compaction zone consisting of "main heating roller-main heating roller" and a secondary compaction zone consisting of "heating roller-auxiliary pressure roller," the material undergoes high-intensity shearing and secondary refining sequentially. This makes the material more fully and controllably dispersed, greatly promoting the mutual penetration, fusion, and dispersion of PVC resin and elastomers and other additives. This makes it easier for the elastomer phase to form a continuous and uniform network structure, significantly improving the elasticity index of the shoe material.

[0016] Compared to traditional equipment that operates repeatedly in a single compaction zone, the two-stage compaction mode rationally distributes shear energy, effectively avoiding thermal-oxidative and mechanical degradation of materials caused by local overheating or excessive shearing. This ensures the integrity of the modified material's molecular structure and guarantees the mechanical properties and long-term stability of the final product.

[0017] The adjustment mechanism converts rotational motion into precise linear displacement by rotating the threaded shaft, thereby fine-tuning the gap between the two main heating rollers. This mechanism offers high adjustment accuracy and, utilizing the inherent self-locking characteristics of the threaded pair, can maintain a constant roller gap for extended periods under immense roller pressure reaction forces, fundamentally ensuring the consistency of the produced sheet thickness.

[0018] The auxiliary pressure roller employs a unique connecting mechanism, particularly the intermediate connecting seat with oppositely oriented threads at both ends. By simply rotating this connecting seat, the height of both ends of the auxiliary pressure roller can be adjusted synchronously and in reverse, quickly achieving parallelism calibration with the axis of the main heating roller. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this application. Figure 1 ;

[0020] Figure 2 This is the main view of this application;

[0021] Figure 3 for Figure 1 Enlarged structural diagram at point A in the middle;

[0022] Figure 4 This is a partial structural diagram of this application;

[0023] Figure 5 This is a schematic diagram of the structure of this application. Figure 2 .

[0024] In the diagram: 1. Auxiliary roller support, 2. Support connecting shaft, 3. Upper connecting frame, 4. Threaded shaft, 5. Cutter, 6. Lower connecting frame, 7. Intermediate connecting seat, 8. Rotary connecting seat, 9. Roller frame mounting groove, 10. Heating roller, 11. Transmission gear, 12. Auxiliary pressure roller, 13. Driven gear, 14. Support connecting seat, 15. Clamping block, 16. Drive motor, 17. Scraper, 18. Horizontal movement group. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application (for ease of description and understanding, hereinafter referred to as...), Figure 2 (The above is described above). All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0026] Please see Figure 1-5This application provides a technical solution: a roller pressing device for elastic modification of PVC injection molded shoe materials, including a roller frame mounting groove 9. The roller frame mounting groove 9 is the main frame of the entire device, welded from high-strength steel plates, providing a mounting base for all its components. Between the roller frame mounting grooves 9, a compression roller group consisting of two heating rollers 10 and one auxiliary pressure roller 12 is arranged in parallel. The two heating rollers 10 are placed horizontally opposite each other, forming a main rolling gap. The auxiliary pressure roller 12 is located on one side of the line connecting the centers of the two heating rollers 10, and forms a secondary rolling gap with one of the heating rollers 10.

[0027] The pre-mixed PVC elasticity-enhancing modified material, typically in lumps or flakes, is fed between two opposing rotating heated rollers 10. The heated rollers 10 are circulated with a heat transfer medium, such as heat transfer oil, and their surfaces are heated to the process temperature of 160°C. Under the high temperature and immense shearing force of the rollers, the material undergoes plasticization, mixing, and stretching. Subsequently, the material coats the heated roller 10 and is carried to the secondary compaction zone formed by the roller and auxiliary roller 12 for secondary refining. This two-stage compaction mode of "main pressure-secondary pressure" allows for more thorough shearing of the material, resulting in more uniform dispersion of PVC resin and elastomers and other additives. The elastomer phase is more likely to form a continuous network structure, thus achieving excellent elasticity enhancement.

[0028] Compared to traditional double-roller equipment, this avoids excessive shearing and heat generation in a single rolling zone, reduces the risk of material degradation, and improves mixing efficiency and uniformity.

[0029] A cutter assembly is positioned above the auxiliary pressure roller 12. This cutter assembly includes a transverse movement group 18, which typically consists of a servo motor, a lead screw, and a linear guide, as well as a cutter 5 and a scraper 17. The cutter 5 is fixed to the moving slider of the transverse movement group 18 via a connector, and the scraper 17 is mounted on the rear side of the cutter 5.

[0030] The crushed sheet material is rotated upwards by the auxiliary pressure roller 12 or the heating roller 10. The lateral movement assembly 18 drives the cutter 5 and the scraper 17 to reciprocate along the roller axis. The cutter 5 is responsible for cutting the wide sheet material into multiple strips of predetermined width, or directly "lifting" the material from the roller surface. The scraper 17, following closely behind, closely adheres to the roller surface and thoroughly scrapes off the remaining material, ensuring continuous and complete output.

[0031] The integrated cutter 5 and scraper 17 enable simultaneous rolling and slitting / unloading processes, achieving a high degree of automation and improving production efficiency. The scraper 17 ensures effective cleaning while avoiding damage to the high-precision roller surface caused by hard scraping.

[0032] The extrusion roller assembly is powered by a drive assembly. The drive motor 16 outputs power through a reducer, and a drive gear is mounted on its output shaft. The transmission assembly includes a driven gear 13 mounted on the shaft end of the heating roller 10, a transmission gear 11 mounted on the shaft end of the auxiliary pressure roller 12, and another heating roller 10 disposed on the auxiliary roller support 1. The drive gear meshes with the driven gear 13, and the transmission gear 11 meshes with the driven gear 13, forming a stable gear transmission system.

[0033] After the drive motor 16 starts, power is synchronously transmitted to the two heating rollers 10 and the auxiliary pressure roller 12 via a gear system. By using gears of different diameters, the speed ratio between the rollers can be precisely controlled, and a certain speed difference exists between the two heating rollers to generate shearing force, thus achieving effective shearing and mixing.

[0034] In addition, gear transmission is smooth, reliable, and has good synchronization, which can ensure a constant speed ratio between rollers, thereby ensuring the stability and reproducibility of the rolling process and facilitating product quality control.

[0035] An auxiliary roller bracket 1 is rotatably mounted on the upper surface of the roller frame mounting groove 9 via bearings, and the heating roller 10 is mounted on this auxiliary roller bracket 1. An adjustment assembly for adjusting the distance between the two heating rollers 10 is provided on one side of the auxiliary roller bracket 1. This adjustment assembly includes a bracket connecting shaft 2 fixed to the side of the auxiliary roller bracket 1, an upper connecting frame 3 and a lower connecting frame 6 fixed to the side of the roller frame mounting groove 9, and a threaded shaft 4. The threaded shaft 4 passes through the open holes of the upper connecting frame 3 and the lower connecting frame 6, and is rotatably connected to the through hole in the center of the bracket connecting shaft 2 via bearings. Specifically, a threaded section is machined on the upper section of the threaded shaft 4, which forms a threaded pair with the threaded hole fixed in the center of the upper connecting frame 3.

[0036] When the roller gap needs to be adjusted, the operator rotates the threaded shaft 4. Since the threaded shaft 4 engages with the threaded hole of the upper connecting frame 3 and its lower part is guided by the lower connecting frame 6, the rotational motion is converted into the movement of the threaded shaft 4 itself. The raising and lowering of the threaded shaft 4 drives the entire auxiliary roller bracket 1 to swing around its rotational connection point with the roller frame mounting groove 9 via the bracket connecting shaft 2, thereby causing the heating roller 10 to move closer to or away from another heating roller 10, achieving precise adjustment of the roller gap.

[0037] This adjustment mechanism converts rotary motion into precise linear displacement, offering high adjustment accuracy and excellent self-locking performance. The threaded pair is self-locking, maintaining a stable roller gap under immense roller pressure, thus ensuring the uniformity of product thickness.

[0038] The auxiliary roller support 1 has a notch on one side, and a locking block 15 is fixed to the end of the notch by bolts. The locking block 15 has a threaded hole, into which one end of the rotating connecting seat 8 is screwed. The other end of the rotating connecting seat 8 is connected to one end of the intermediate connecting seat 7. The other end of the intermediate connecting seat 7 is connected to the support connecting seat 14, which is sleeved on the shaft end of the auxiliary pressure roller 12 via a bearing. The intermediate connecting seat 7 has threaded holes machined inside both ends, with the threads of the two holes rotating in opposite directions.

[0039] Rotating the rotating connecting seat 8 allows it to screw in or out of the threaded hole in the locking block 15, thereby enabling fine-tuning of the horizontal position of the auxiliary pressure roller 12 and ensuring accurate positioning of it relative to the compaction zone of the main heating roller 10. When it is necessary to adjust the parallelism between the auxiliary pressure roller 12 and the heating roller 10, simply rotate the intermediate connecting seat 7 itself. Since the threads at both ends rotate in opposite directions, rotating the intermediate connecting seat 7 will cause the connection points at both ends to move simultaneously towards or away from each other, thus lifting one end and lowering the other end, or vice versa, ultimately achieving the adjustment of the inclination angle of the axis of the auxiliary pressure roller 12 relative to the axis of the heating roller 10, ensuring uniformity of the secondary compaction gap.

[0040] The auxiliary pressure roller can be positioned and its parallelism calibrated quickly and accurately through a simple rotation operation, which greatly facilitates the installation, debugging and maintenance of the equipment and eliminates the problem of uneven sheet thickness caused by non-parallel rollers.

[0041] In use: After the heating roller 10 reaches the set temperature, jog the drive motor 16 to confirm that the rotation direction of the two heating rollers 10 and the auxiliary pressure roller 12 is correct. Depending on the required thickness of the sheet to be rolled, rotate the threaded shaft 4 of the adjustment group. Rotate clockwise or counterclockwise to move the auxiliary roller bracket 1, which in turn moves one heating roller 10, thereby precisely adjusting the gap between the two heating rollers 10. Use a feeler gauge for precise measurement until the predetermined roller gap is achieved. If it is necessary to adjust the contact position between the auxiliary pressure roller 12 and the heating roller 10, rotate the rotating connecting seat 8 to move it forward or backward in the threaded hole of the locking block 15 for fine-tuning. If uneven gaps are found in the secondary rolling area, rotate the intermediate connecting seat 7. Because its two ends are counter-rotating threads, the height of both ends of the auxiliary pressure roller 12 will be adjusted synchronously during rotation to ensure that its axis is parallel to the axis of the heating roller 10, thereby obtaining a sheet of uniform thickness. Depending on production requirements, roll out the sheet in one piece or cut it into multiple strips. Adjust the height of the cutter 5 and the stroke and speed of the transverse movement group 18.

[0042] The pre-mixed lumps or sheets of PVC elastic modifier are fed at a uniform speed into the main rolling gap between two heated rollers 10. After being rolled under high temperature and pressure, the material will coat the roller surface. It is then carried to the secondary rolling zone formed by the rollers and the auxiliary rollers 12 for secondary refining. The refined sheet is moved to the top as the rollers rotate, where it is cut or lifted by the reciprocating cutter 5, and then completely scraped off by the scraper 17 to complete the discharge. During the production process, it is necessary to closely observe the plasticization status of the material, the surface quality of the sheet, and the uniformity of the thickness. If necessary, the roller temperature, roller gap, or speed can be finely adjusted.

[0043] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A roller pressing device for elastic modification of PVC injection molded shoe material, comprising a roller frame mounting groove (9), characterized in that: A set of extrusion rollers is provided between the roller frame mounting slots (9); The extrusion roller assembly includes a heating roller (10) and an auxiliary pressure roller (12). The two heating rollers (10) are arranged opposite each other, and the auxiliary pressure roller (12) is located on one side of the middle position of the two heating rollers (10). A cutting blade assembly is arranged above the auxiliary pressure roller (12). The cutting assembly includes a transverse moving assembly (18), a cutting blade (5), and a scraper (17). The cutting blade (5) is mounted on the transverse moving assembly (18) via a connector, and the scraper (17) is mounted on the rear side of the cutting blade (5). The scraper (17) is mounted on the support connector in the transverse moving assembly (18).

2. The roller pressing device for elastic modification of PVC injection molded shoe material according to claim 1, characterized in that: The extrusion roller assembly also includes a drive assembly, which includes a drive motor (16) and a transmission assembly. The end of the drive motor (16) is provided with a drive gear, which meshes with the transmission assembly.

3. The roller pressing device for elastic modification of PVC injection molded shoe material according to claim 2, characterized in that: The transmission assembly includes a driven gear (13) and a transmission gear (11). The driven gear (13) is located at the end of the heating roller (10), and the transmission gear (11) is located at the end of the auxiliary pressure roller (12).

4. The roller pressing device for elastic modification of PVC injection molded shoe material according to claim 1, characterized in that: An auxiliary roller bracket (1) is rotatably mounted on the upper surface of the roller frame mounting groove (9). One of the heating rollers (10) is arranged between the auxiliary roller brackets (1). An adjustment group for adjusting the distance between the two heating rollers (10) is provided on one side of the auxiliary roller bracket (1).

5. The roller pressing device for elastic modification of PVC injection molded shoe material according to claim 4, characterized in that: The adjustment assembly includes a support connecting shaft (2), an upper connecting frame (3), a threaded shaft (4), and a lower connecting frame (6). The support connecting shaft (2) is located on one side of the auxiliary roller support (1). The upper connecting frame (3) and the lower connecting frame (6) are located on the sides of the roller frame mounting groove (9). The threaded shaft (4) passes through the upper connecting frame (3) and the lower connecting frame (6) and is rotatably connected to the through hole in the support connecting shaft (2). The threaded shaft (4) is provided with a threaded section, which is screwed into the threaded hole on the upper connecting frame (3).

6. The roller pressing device for elastic modification of PVC injection molded shoe material according to claim 4, characterized in that: A notch is provided on one side of the auxiliary roller bracket (1), and a locking block (15) is provided at the end of the notch. A rotating connecting seat (8) is provided on the locking block (15). The rotating connecting seat (8) is threaded into the threaded hole of the locking block. An intermediate connecting seat (7) is connected to the end of the rotating connecting seat (8). The intermediate connecting seat (7) is connected to the bracket connecting seat (14) sleeved on the end of the auxiliary pressure roller (12).

7. The roller pressing device for elastic modification of PVC injection molded shoe material according to claim 6, characterized in that: Both ends of the intermediate connecting seat (7) are provided with threaded holes, and the threads in the threaded holes are rotated in opposite directions.

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