Three-roller plastic sheeting calender
By designing a protective mechanism on the three-roll calender for plastic sheets and utilizing the limit connection between the main and auxiliary doors, the problems of component damage and roller burns during equipment shutdown are solved, thus improving safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUBEI SANMU TECHNOLOGY DEVELOPMENT CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-29
AI Technical Summary
Three-roll calenders for plastic sheets are susceptible to damage from impacts by hard objects when the machine is stopped, and the high temperature of the rollers can easily cause burns, lacking effective protection.
A protective mechanism with a main door and a secondary door is designed. It prevents collisions with external hard objects by connecting locks and latches, and automatically closes after processing to prevent accidental contact with the rollers.
It effectively protects internal parts from damage, prevents workers from being burned by accidental contact with the rollers, and improves the safety of the equipment.
Smart Images
Figure CN224296373U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of plastic processing equipment technology, and in particular to a three-roll calender for plastic sheets. Background Technology
[0002] In the production of plastic sheets, the three-roll calender is a commonly used processing equipment. Its working principle is to use the cooperation of three rollers to extrude, stretch and cool the plastic melt to obtain plastic sheets with the required thickness and surface quality.
[0003] However, when the equipment is idle and the operators have finished their shift's production tasks and left the site, the internal parts of the calender are easily damaged by impacts from hard objects, which can affect subsequent use. Furthermore, if cleaning personnel accidentally touch the equipment, it may suddenly start if the power is not completely cut off, causing fatal injuries such as squeezing or entanglement. In addition, the surface temperature of the rollers in the calender can reach over 200°C during production, and even after the machine is stopped, high temperatures may remain. Without effective protection, workers may accidentally touch the rollers, resulting in burns. Therefore, a three-roll calender for plastic sheets is proposed to solve the above problems. Utility Model Content
[0004] (a) Purpose of the utility model
[0005] To address the technical problems existing in the background art, this utility model proposes a three-roll calender for plastic sheets. After the plastic sheet is processed, the main door is first rotated and closed, causing the auxiliary doors connected to the main doors on both sides to move closer together. Then, the connecting lock and latch are connected, which can limit the movement of the auxiliary doors on both sides. This can protect multiple pressure shaft components, prevent external hard objects from directly damaging the internal parts, and also prevent workers from accidentally touching the rollers, thus improving overall safety.
[0006] (II) Technical Solution
[0007] This utility model provides a three-roll calender for plastic sheets, including a calender support, two sliding rods as a group, and three pressure shaft assemblies. The two groups of sliding rods are respectively installed in the openings on both sides of the calender support, and the three pressure shaft assemblies are respectively installed between the two groups of sliding rods. A support assembly is installed at the bottom of the calender support, and a top plate is installed above the inner wall of the calender support. Side plates are detachably connected to the openings on both sides of the calender support.
[0008] The front and rear sides of the calender support are equipped with opening and closing mechanisms that can protect the pressure shaft assembly.
[0009] The opening and closing mechanism includes symmetrically distributed main doors. Two sets of symmetrically distributed main doors are hinged to the front and rear sides of the calender support. A secondary door is slidably connected inside the main door. Connecting locks and latches are respectively installed on the secondary doors that can abut against each other. The main doors and the secondary doors are connected by a moving component.
[0010] A magnetic attraction assembly is also installed between the main switch door and the calender support.
[0011] Preferably, the pressure shaft assembly includes a drive motor, a roller, and two movable blocks. The drive motor is mounted on the side of the movable block, the roller is rotatably connected between the two compatible movable blocks, and the output shaft of the drive motor passes through the movable block connected to it and is coaxially connected to the roller.
[0012] Preferably, symmetrically distributed slide rods are installed in the openings on both sides of the calender support, and three movable blocks are passed through the symmetrically distributed slide rods. The movable block in the middle is fixedly connected to the symmetrically distributed slide rod, while the movable blocks on both sides are slidably connected to the symmetrically distributed slide rod. The upper and lower sides of the inner walls of the openings on both sides of the calender support are connected to the movable blocks on both sides by electric push rods.
[0013] Preferably, the moving component includes a slide rail, an electric slider, a connecting plate, and a connecting block. The slide rail is horizontally installed on the side wall of the main switch door. The connecting block is installed on the side wall of the secondary switch door and connected to the end away from the main switch door. One end of the electric slider is slidably connected to the slide groove of the slide rail, and the other end of the electric slider is connected to the connecting block through the connecting plate.
[0014] Preferably, it also includes a handle, which is installed on the side of the main door.
[0015] Preferably, the magnetic suction assembly includes a first magnetic suction plate and a second magnetic suction plate. The four first magnetic suction plates are respectively installed on the sides of the four main doors of the switch, and the four second magnetic suction plates are installed on the sides of the calender bracket and are respectively adapted to the positions of the first magnetic suction plates.
[0016] Preferably, it also includes a plurality of fixing bolts, which pass through the side plate and extend threadedly into the interior of the calender support.
[0017] Preferably, the support assembly includes a bottom bracket and a base plate, and both ends of the bottom of the calender bracket are respectively connected to the base plate through the bottom bracket.
[0018] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects:
[0019] This three-roll calender for plastic sheets, after the plastic sheet is processed, first drives the main door to rotate and close. Then, by activating the moving components on both sides of the main door, it causes the connected secondary doors on both sides to move closer together, making them contact each other and connecting the locks and latches. This limits the movement of the secondary doors on both sides, thus protecting multiple pressing shaft components from direct damage to internal parts caused by external hard objects. It also prevents workers from accidentally touching the rollers, improving overall safety. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of a three-roll calender for plastic sheets proposed in this utility model.
[0021] Figure 2 This is a perspective view of a protective device used in a three-roll calender for plastic sheets, as proposed in this utility model.
[0022] Figure 3 This is a partial cross-sectional view of a three-roll calender for plastic sheets proposed in this utility model.
[0023] Figure 4 This is a perspective view of a moving component in a three-roll calender for plastic sheets according to the present invention.
[0024] Reference numerals: 1. Top plate; 2. Side plate; 3. Fixing bolt; 4. First magnetic suction plate; 5. Second magnetic suction plate; 6. Bottom bracket; 7. Base plate; 8. Handle; 9. Switch for secondary door; 10. Switch for main door; 11. Calender bracket; 12. Roller; 13. Connecting plate; 14. Slide rod; 15. Electric push rod; 16. Moving block; 17. Drive motor; 18. Connecting block; 19. Slide rail; 20. Electric slider; 21. Connecting lock; 22. Lock. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.
[0026] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, such as welding, riveting, or bonding; it can also be a detachable connection, such as threaded connection, keyed connection, or pin connection; or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] like Figure 1-4 As shown, the present invention proposes a three-roll calender for plastic sheets, including a calender support 11, two sliding rods 14 as a group, and three pressure shaft assemblies. The two groups of sliding rods 14 are respectively installed in the openings on both sides of the calender support 11, and the three pressure shaft assemblies are respectively installed between the two groups of sliding rods 14. A support assembly is installed at the bottom of the calender support 11, and a top plate 1 is installed above the inner wall of the calender support 11. Side plates 2 are detachably connected to the openings on both sides of the calender support 11.
[0029] The front and rear sides of the calender support 11 are equipped with opening and closing mechanisms that can protect the pressure shaft assembly.
[0030] The opening and closing mechanism includes symmetrically distributed main doors 10. Two sets of symmetrically distributed main doors 10 are hinged to the front and rear sides of the calender support 11. The main doors 10 are slidably connected to the interior of the secondary doors 9. The secondary doors 9 on both sides are equipped with connecting locks 21 and latches 22 that can be connected. The main doors 10 and the secondary doors 9 are connected by a moving component.
[0031] A magnetic attraction assembly is also installed between the main door 10 and the calender support 11.
[0032] In this invention, during use, multiple pressure shaft components are activated to process the plastic sheet. After the plastic sheet is processed, the main switch door 10 is rotated and closed. Then, by activating the moving components on both sides of the main switch door 10, the connected secondary switch doors 9 on both sides of the main switch door 10 are brought closer together, so that the secondary switch doors 9 on both sides come into contact with each other and the connecting lock 21 and the latch 22 are connected, thereby limiting the movement of the secondary switch doors 9 on both sides and thus protecting the multiple pressure shaft components.
[0033] In an optional embodiment, the pressure shaft assembly includes a drive motor 17, a roller 12, and two movable blocks 16. The drive motor 17 is mounted on the side of the movable block 16, and the roller 12 is rotatably connected between the two compatible movable blocks 16. The output shaft of the drive motor 17 passes through the movable block 16 connected to it and is coaxially connected to the roller 12. Symmetrically distributed slide rods 14 are installed in the openings on both sides of the calender support 11. Three movable blocks 16 pass through the symmetrically distributed slide rods 14. The middle movable block 16 is fixedly connected to the symmetrically distributed slide rod 14, and the two side movable blocks 16 are slidably connected to the symmetrically distributed slide rods 14. The upper and lower sides of the inner walls of the openings on both sides of the calender support 11 are connected to the movable blocks 16 on both sides respectively through electric push rods 15.
[0034] It should be noted that by adjusting the extension and retraction of multiple electric push rods 15, the moving block 16 can be moved along the symmetrically distributed slide rod 14, thereby adjusting the position of the interval between the three rollers 12; and the drive motors 17 are started respectively, which can drive the rollers 12 connected to them to rotate, so as to process plastic sheets of different thicknesses as needed.
[0035] In an optional embodiment, the moving component includes a slide rail 19, an electric slider 20, a connecting plate 13, and a connecting block 18. The slide rail 19 is horizontally mounted on the side wall of the main door 10. The connecting block 18 is mounted on the side wall of the secondary door 9 and connected to one end away from the main door 10. One end of the electric slider 20 is slidably connected to the slide groove of the slide rail 19, and the other end of the electric slider 20 is connected to the connecting block 18 through the connecting plate 13.
[0036] It should be noted that when the electric slider 20 is activated, it can move within the groove inside the slide rail 19, allowing it to move the secondary door 9 via the connecting plate 13 and connecting block 18. When the main door 10 is opened, the secondary door 9 can move into the pre-drilled groove of the main door 10. When the main door 10 is closed, the secondary door 9 can move out of the pre-drilled groove of the main door 10, causing the secondary doors 9 on both sides to contact each other and connecting the connecting lock 21 and the latch 22, thereby providing protection for the three rollers 12.
[0037] In an optional embodiment, a handle 8 is also included, which is mounted on the side of the main door 10.
[0038] It should be noted that the handle 8 facilitates the opening and closing of the main door 10.
[0039] In an optional embodiment, the magnetic suction assembly includes a first magnetic suction plate 4 and a second magnetic suction plate 5. The four first magnetic suction plates 4 are respectively installed on the sides of the four main doors 10, and the four second magnetic suction plates 5 are installed on the sides of the calender bracket 11 and are respectively adapted to the positions of the first magnetic suction plates 4.
[0040] It should be noted that when the main door 10 is opened, the main door 10 is rotated 180°. At this time, the first magnetic plate 4 on the main door 10 will be connected to the second magnetic plate 5 on the calender bracket 11 through magnetic force, so as to prevent the main door 10 from moving randomly when it is opened.
[0041] In an optional embodiment, a plurality of fixing bolts 3 are also included, which pass through the side plate 2 and extend threadedly into the interior of the calender support 11.
[0042] It should be noted that by rotating multiple fixing bolts 3, multiple fixing bolts 3 can be removed, so that the side plate 2 can be separated from the calender support 11, so that the parts inside the openings on both sides of the calender support 11 can be maintained and repaired.
[0043] In an optional embodiment, the support assembly includes a bottom bracket 6 and a base plate 7. Both ends of the bottom of the calender support 11 are connected to the base plate 7 via the bottom bracket 6. The support assembly can provide stable support for the calender support 11.
[0044] It should be noted that the symmetrically distributed bottom supports 6 can connect the bottom plate 7 to the calender support 11, thereby providing stable support for the calender support 11.
[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A three-roll calender for plastic sheets, comprising a calender support (11), two sliding rods (14) as a group, and three pressure shaft assemblies, wherein the two groups of sliding rods (14) are respectively installed in openings on both sides of the calender support (11), the three pressure shaft assemblies are respectively installed between the two groups of sliding rods (14), a support assembly is installed at the bottom of the calender support (11), and a top plate (1) is installed above the inner wall of the calender support (11), characterized in that, Side plates (2) are detachably connected to the openings on both sides of the calender support (11). The front and rear sides of the calender support (11) are equipped with opening and closing mechanisms that can protect the pressure shaft assembly; The opening and closing mechanism includes symmetrically distributed main doors (10), and two sets of symmetrically distributed main doors (10) are hinged to the front and rear sides of the rolling mill support (11). The main doors (10) are slidably connected to secondary doors (9). The secondary doors (9) on both sides are equipped with connecting locks (21) and latches (22) that can be connected. The main doors (10) and the secondary doors (9) are connected by a moving component. A magnetic attraction assembly is also installed between the main door (10) and the calender support (11).
2. The three-roll calender for plastic sheets according to claim 1, characterized in that, The pressure shaft assembly includes a drive motor (17), a roller (12), and two movable blocks (16). The drive motor (17) is mounted on the side of the movable block (16), and the roller (12) is rotatably connected between the two compatible movable blocks (16). The output shaft of the drive motor (17) passes through the movable block (16) connected to it and is coaxially connected to the roller (12).
3. A three-roll calender for plastic sheets according to claim 2, characterized in that, The calender support (11) has symmetrically distributed slide rods (14) installed in the openings on both sides. Three moving blocks (16) are passed through the symmetrically distributed slide rods (14). The moving block (16) in the middle is fixedly connected to the symmetrically distributed slide rods (14), while the moving blocks (16) on both sides are slidably connected to the symmetrically distributed slide rods (14). The upper and lower sides of the inner walls of the openings on both sides of the calender support (11) are connected to the moving blocks (16) on both sides respectively by electric push rods (15).
4. A three-roll calender for plastic sheets according to claim 1, characterized in that, The moving component includes a slide rail (19), an electric slider (20), a connecting plate (13), and a connecting block (18). The slide rail (19) is horizontally installed on the side wall of the main switch door (10). The connecting block (18) is installed on the side wall of the secondary switch door (9) and connected to one end away from the main switch door (10). One end of the electric slider (20) is slidably connected to the slide groove of the slide rail (19). The other end of the electric slider (20) is connected to the connecting block (18) through the connecting plate (13).
5. A three-roll calender for plastic sheets according to claim 1, characterized in that, It also includes a handle (8), which is installed on the side of the main door (10) for opening and closing.
6. A three-roll calender for plastic sheets according to claim 1, characterized in that, The magnetic suction assembly includes a first magnetic suction plate (4) and a second magnetic suction plate (5). The four first magnetic suction plates (4) are respectively installed on the sides of the four main doors (10) of the switch, and the four second magnetic suction plates (5) are installed on the sides of the calender bracket (11) and are respectively adapted to the positions of the first magnetic suction plates (4).
7. A three-roll calender for plastic sheets according to claim 1, characterized in that, It also includes a plurality of fixing bolts (3), which pass through the side plate (2) and extend threadedly into the interior of the calender support (11).
8. A three-roll calender for plastic sheets according to claim 1, characterized in that, The support assembly includes a bottom bracket (6) and a base plate (7). Both ends of the bottom of the calender bracket (11) are connected to the base plate (7) through the bottom bracket (6).