Rubber double-screw extrusion tablet press upper roller scraper device

Abstract

The utility model belongs to the rubber double screw extrusion tablet press upper roller scraper device belongs to the rubber double screw extrusion tablet press scraper device, installs in the tablet direction of upper roller, the rubber double screw extrusion tablet press scraper device includes scraper, tool rest, adjusting pad and limiting device, one end of scraper installs on tool rest, and the tangent direction of scraper tip is parallel to the circumference of upper roller, and the clearance between scraper tip and the nearest point of upper roller is L, the positioning cover and end cover of both sides of upper roller are equipped with processing surface and mounting hole for installing tool rest, adjusting pad is inserted and installed between tool rest and the positioning cover and end cover of both sides of upper roller, the limiting device includes the baffle and the limit switch, and the baffle moves along with upper roller, and the limit switch is installed in the inner side surface of the tablet device support. The device can avoid the phenomenon of roller wrapping, and avoid the interference of limiting device to scraper device.

Description

Technical Field

[0001] This utility model relates to the field of rubber mixing technology, and in particular to a scraper device for the upper roller of a rubber twin-screw extruder. Background Technology

[0002] Twin-screw extruders are commonly used equipment in rubber product manufacturing companies. The rubber compound produced in the internal mixer is discharged from the discharge port. Due to gravity, the rubber compound falls between the two screws of the twin-screw extruder. Driven by the transmission system, the two screws move in opposite directions synchronously inward and mesh with each other. Their relative rotational motion pushes the rubber compound forward. In the enclosed space of the extruder barrel, the rubber compound is subjected to strong shearing, squeezing and folding action by the two screws. After being collected and gathered by the baffle plate, it is pushed between the two pressing rollers. The two opposing rotating rollers press the rubber compound into a continuous sheet of a certain thickness before it enters the next process.

[0003] With the rapid popularization of concepts such as "vacuum tires" and "green tires" in recent years, terms like "butyl rubber" and "silica" are increasingly appearing in the rubber industry market. This means that production equipment needs to have better anti-sticking and corrosion resistance. To meet market demands, Chinese rubber equipment manufacturers are constantly committed to improving the anti-sticking and corrosion resistance of roller working surfaces. It is well known that once rubber sheet wrapping occurs during equipment operation, the photoelectric switch used to detect this condition will send an alarm signal through electronic control, notifying the operator to take immediate emergency measures. However, this inevitably affects continuous production and increases the labor intensity of workers. More and more users hope that when wrapping occurs, the wrapping behavior can be stopped in advance by other means before the wrapping detection switch detects the signal. Therefore, many users have included the lower roller scraper device in the standard configuration of their equipment. To further improve the user experience, this utility model designs an upper roller scraper device for a rubber twin-screw extruder, which also adds a preventative measure against the problem of upper roller sticking. Utility Model Content

[0004] The purpose of this invention is to provide a scraper device for the upper roller of a rubber twin-screw extruder tablet press.

[0005] The technical solution of this utility model is as follows: A scraper device for the upper roller of a rubber twin-screw extrusion tablet press is installed in the tableting direction of the upper roller. The scraper device for the upper roller of the rubber twin-screw extrusion tablet press includes a scraper 1, a blade holder, an adjusting pad, and a limiting device. One end of the scraper 1 is installed on the blade holder, and the tip of the scraper 1 is parallel to the tangent direction of the circumference of the upper roller. The gap between the tip of the scraper 1 and the nearest point of the upper roller 11 is L.

[0006] The positioning covers and end covers on both sides of the upper roller 11 are provided with machining surfaces and mounting holes for mounting the tool holder; the adjusting pad 3 is inserted and inserted between the tool holder and the positioning covers and end covers 9 on both sides of the upper roller.

[0007] The limiting device includes a stop block 8 and a limit switch 6. The stop block moves with the upper roller 11, and the limit switch 6 is installed on the inner side of the tablet pressing device bracket 7.

[0008] When the upper roller 11 moves up and down under the action of the adjusting device, the scraper device of the upper roller of the rubber twin-screw extruder moves with the blade holder, and the positional relationship between it and the upper roller 11 remains unchanged.

[0009] The impact block 8 is made of carbon steel plate welded together. The mounting plate is located above the knife holder and fixed to the inner side of the bearing seat 10 of the tablet pressing device. The head sensing block is located on the inner side of the tablet pressing device bracket 7 and maintains a gap with it. The mounting plate and the sensing block are connected by a connecting plate. The connecting plate spans the baffle in the tablet pressing device and has a gap with it, so that the impact block 8 moves up and down with the upper roller 11 and contacts the limit switch 6 installed on the inner side of the tablet pressing device bracket 7, thereby playing a limiting role.

[0010] Near the upper roller 11, the outer contour of the knife holder is arc-shaped, and the upper and lower end faces are parallel to the upper and lower surfaces of the upper bearing seat 10; on the outside of the equipment, the outer contour of the knife holder is an oblique line following the placement of the scraper; the intersection of the knife holder contour lines is all transitioned by arcs.

[0011] The line connecting the tip of scraper 1 to the nearest point of the upper roller 11 and the center of the upper roller 11 forms a 60° angle with the center line of the tablet pressing device.

[0012] The beneficial effects of this utility model are as follows: A point is taken in the sheet-exit direction of the upper roller as the blade tip; the gap between the scraper and the roller along the tangential direction is L; the width of the scraper covers the sheet-exit width of the equipment; the positioning covers and end covers on both sides of the upper roller are provided with machining surfaces and mounting holes for mounting the blade holder; both ends of the device are equipped with removable adjusting pads, which can be used to compensate for errors in the length direction of the entire scraper device caused by machining and installation. This can prevent the roller from wrapping around itself and avoid interference between the limiting device and the scraper device. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the present invention in the working position of the equipment.

[0014] Figure 2 This is the front view of the present invention.

[0015] Figure 3 for Figure 2 A magnified view of section I in the image.

[0016] Figure 4 for Figure 2A magnified view of section II in the image.

[0017] Figure 5 for Figure 2 AA rotated section view in the image.

[0018] Figure 6 This is a three-dimensional schematic diagram of the right tool holder in this utility model.

[0019] Figure 7 This is a three-dimensional schematic diagram of the scraper in this utility model.

[0020] Figure 8 This is a three-dimensional perspective view of the mounting surface positioning cover / end cover of this utility model.

[0021] Figure 9 for Figure 1 A magnified view of section III in the image.

[0022] Figure 10 This is a structural diagram of a conventional limit device.

[0023] In the diagram: 1-Scraper; 2-Left blade holder; 3-Adjusting shim a; 4-Adjusting shim b; 5-Right blade holder; 6-Limit switch; 7-Pressure plate holder; 8-Bumper block; 9-Positioning cover and end cover; 10-Upper bearing seat; 11-Upper roller; 12-Baffle. Detailed Implementation

[0024] like Figure 1 As shown, a rubber twin-screw extrusion tablet press upper roller scraper device is installed on the sheeting direction side of the upper roller 11. The left blade holder 2 and the right blade holder 5 are fixed on the mounting surfaces of the positioning covers and end covers 9 at both ends of the upper roller. This installation method allows the device to move up and down with the upper roller 11.

[0025] The scraper 1 has a 20° angle at its head, with its long side close to the upper roller 11. A section parallel to the shaft end is taken on the working surface of the upper roller 11, and a parallel line 3mm from the long side of the scraper head is tangent to the roller surface (i.e., the gap between the scraper and the roller surface is 3mm). Figure 5 As shown in the diagram, the line connecting the point of tangency between the parallel line and the circumference of the roller and the center of the roller forms a 60° angle with the center line of the pressing device. This tangent point effectively prevents the film from wrapping around the roller without hindering the overall function of the pressing device. The scraper 1 is relatively thick to prevent deformation of the blade surface due to the enormous pressure generated by the accumulated adhesive during use. The scraper 1 is also quite long; therefore, its flatness and straightness tolerances must be strictly controlled during processing.

[0026] The shape and structure of the left blade holder 2 and the right blade holder 5 are determined by the placement angle of the scraper and their own installation space: such as Figure 6As shown, near the upper roller 11, the outer contour of the cutter holder is arc-shaped, with both the upper and lower end faces parallel to the upper and lower surfaces of the upper bearing seat 10. On the outside of the equipment, the outer contour of the cutter holder forms an oblique line following the placement of the scraper 1. The intersections of the cutter holder contour lines are all transitioned by arcs. To ensure the overall strength and rigidity of the device, the mounting plate of the cutter holder has a certain thickness, and stiffening plates are provided at both the front and rear of the mounting plate.

[0027] like Figure 8 As shown, the mounting holes of the tool holder are evenly distributed along the inner contour and the scraper mounting position, ensuring uniform force distribution across the entire tool holder and facilitating installation and disassembly. Figure 7 As shown, both the scraper and the scraper holder have pre-set elongated holes to allow for subsequent adjustments to the scraper, ensuring a certain gap between it and the upper roller and protecting the roller from being scratched.

[0028] The device is equipped with adjusting shims a3 and b4 on both sides to compensate for machining and installation errors along the length of the entire scraper device. The adjusting shims can be installed as needed during the final adjustment stage, and their structure is a fully open insert on one side for easy removal and installation.

[0029] According to the process requirements of the rubber twin-screw extruder tablet press, the roller gap needs to be adjusted. This adjustment is achieved through a roller gap adjusting device, while a limiting device controls the roller gap simultaneously. The limiting device mainly consists of a stop block 8 and a limit switch 6. During the adjustment process, the stop block 8 contacts the limit switch 6, controlling the rotation and stopping of the roller gap adjusting motor. Since this device moves up and down with the upper roller 11, a conventional limiting device would collide with the scraper support during its movement. Considering the structural characteristics of this device, a new limiting device was designed to work in conjunction with it: the stop block 8 is welded from carbon steel plate. The mounting plate of the stop block 8 is located above the cutter holder and fixed to the inner side of the bearing seat 10 on the tablet press with screws. The head sensing block is located on the inner side of the tablet press support 7, maintaining a gap with it. The mounting plate and the sensing block are connected by a connecting plate that spans the baffle 12 inside the tablet press while maintaining a gap with it. This allows the stop block 8 to move up and down with the upper roller 11, contacting the limit switch installed on the inner side of the tablet press support, thus achieving a limiting function.

Claims

1. A rubber twin-screw extrusion press machine upper roll knife device, characterized by, The upper roller scraper device of the rubber twin-screw extruder tablet press is installed in the sheeting direction of the upper roller. The upper roller scraper device of the rubber twin-screw extruder tablet press includes a scraper (1), a blade holder, an adjusting pad and a limiting device; one end of the scraper (1) is installed on the blade holder, the tip of the scraper (1) is parallel to the tangent direction of the circumference of the upper roller, and the gap between the tip of the scraper (1) and the nearest point of the upper roller (11) is L; The positioning covers and end covers on both sides of the upper roller (11) are provided with machining surfaces and mounting holes for mounting the tool holder; the adjusting pad (3) is inserted and inserted between the tool holder and the positioning covers and end covers (9) on both sides of the upper roller; The limiting device includes a stop block (8) and a limit switch (6). The stop block moves with the upper roller (11), and the limit switch (6) is installed on the inner side of the tablet pressing device bracket (7).

2. The rubber twin-screw extrusion press machine top roll knife device according to claim 1, characterized in that, When the upper roller (11) moves up and down under the action of the adjusting device, the scraper device of the rubber twin-screw extruder moves with the blade holder, and the positional relationship between it and the upper roller (11) remains unchanged.

3. The rubber twin-screw extrusion press machine top roll knife device according to claim 1, characterized in that, The impact block (8) is made of carbon steel plate welded together. The mounting plate is located above the knife holder and fixed on the inner side of the bearing seat (10) of the tablet pressing device. The head sensing block is located on the inner side of the tablet pressing device bracket (7) and maintains a gap with it. The mounting plate and the sensing block are connected by a connecting plate. The connecting plate spans the baffle in the tablet pressing device and has a gap with it, so that the impact block (8) moves up and down with the upper roller (11) and contacts the limit switch (6) installed on the inner side of the tablet pressing device bracket (7), thereby playing a limiting role.

4. The upper roller scraper device of the rubber twin-screw extruder tablet press according to claim 1, characterized in that, On the side near the upper roller (11), the outer contour of the tool holder is arc-shaped, and the upper and lower end faces are parallel to the upper and lower surfaces of the upper bearing seat (10); on the outside of the equipment, the outer contour of the tool holder is an oblique line following the placement of the scraper; the intersection of the tool holder contour lines is all transitioned by arcs.

5. The upper roller scraper device of the rubber twin-screw extruder tablet press according to claim 1, characterized in that, The line connecting the tip of the scraper (1) to the nearest point of the upper roller (11) and the center of the upper roller (11) forms a 60° angle with the center line of the tablet pressing device.

Images