Four-roller calender for plastic sheet

Abstract

This utility model belongs to the field of calendering technology, specifically a four-roll calendering machine for plastic sheets. It includes a frame, a conveyor table installed at the end of the frame, multiple conveyor rollers rotatably connected to the top of the conveyor table, a motor fixed to the side wall of the frame, an adjustment component installed at the motor output end, multiple calendering rollers installed in the middle of the frame, two of which are installed in the middle of the adjustment component, a cleaning component installed in the middle of the frame, and a positioning component installed at the top of the conveyor table. The adjustment component includes a rotating shaft rotatably connected to the side wall of the frame and fixed to the motor output end. A second gear is fixed to the end of the rotating shaft. This structure allows for rapid adjustment of the gap between the two calendering rollers during plastic calendering, enabling calendering of sheets to different thicknesses according to calendering requirements. It can adapt to the characteristics of different raw materials, ensuring stable molding of various plastics.

Description

Technical Field

[0001] This utility model belongs to the field of calendering technology, specifically a four-roll calendering machine for plastic sheets. Background Technology

[0002] Four-roll calenders are mainly used in the plastics, rubber and metal industries for calendering and forming. Four-roll calenders are usually L, Z or S-shaped.

[0003] Plastic sheets are made from high molecular polymers as the main material, with the addition of fillers, plasticizers and stabilizers and other auxiliary materials, through processes such as extrusion and calendering. Plastic sheets are continuously extruded, stretched and shaped by a calender to form uniform sheets. Usually, the material passes through the gap between four rollers at a time. With each roller gap, the thickness of the sheet gradually decreases, eventually forming a sheet of the specified thickness.

[0004] In some traditional four-roll calenders, when adjusting the pressure rollers, the two ends of a single pressure roller are adjusted individually. This can easily cause the center line between the two rollers to shift, resulting in uneven compaction thickness of the sheet material.

[0005] Therefore, this utility model provides a four-roll calender for plastic sheets. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: The four-roll calender for plastic sheets of this utility model includes a frame, a conveyor table installed at the end of the frame, multiple conveyor rollers rotatably connected to the top of the conveyor table, a motor fixedly connected to the side wall of the frame, an adjustment component installed at the output end of the motor, multiple calendering rollers installed in the middle of the frame, two of the calendering rollers installed in the middle of the adjustment component, a cleaning component installed in the middle of the frame, a positioning component installed at the top of the conveyor table, the adjustment component including a rotating shaft, the rotating shaft rotatably connected to the side wall of the frame, the rotating shaft fixedly connected to the output end of the motor, a second gear fixedly connected to the end of the rotating shaft, a second gear rotatably connected to the inner side wall of the frame, a rack installed in the middle of the two second gears, two adjustment slots opened in the inner side wall of the frame, the two adjustment slots are arranged opposite each other, a first bevel gear rotatably connected to the bottom of one adjustment slot, the first bevel gear meshing in the middle. The machine is equipped with a second bevel gear, a rotating handle fixedly connected to the middle of the second bevel gear, and a bidirectional lead screw fixedly connected to the middle of the first bevel gear. The end of the bidirectional lead screw is rotatably connected to the top of the adjusting groove. Two square nuts are installed in the middle of the bidirectional lead screw, and a first gear is rotatably connected to the middle of the square nuts. One of the first gears is meshed with a rack in the middle, and the other is slidably connected to two first sliders in the middle of the adjusting groove. One end of the calendering roller is fixedly connected to the middle of the first gear, and the other end of the calendering roller is rotatably connected to the middle of the first slider. With the above structure, the gap between the two calendering rollers can be quickly adjusted during the plastic calendering process. Different thicknesses of sheet can be calendered according to calendering requirements. It can adapt to the characteristics of different raw materials, so that various plastics can be stably molded, flexibly respond to different customer needs, quickly switch to produce sheets of different thicknesses, reduce sheet thickness production fluctuations, and reduce waste generation.

[0008] Preferably, the cleaning assembly includes a dust collection box fixed to the top of the frame. A connecting pipe is fixed to the middle of the dust collection box. Two first sliding grooves are formed on the inner side wall of the frame. A first fixed rod is fixed to the middle of the first sliding groove. Two sliding rods are slidably connected to the middle of the first fixed rod. A first spring is fixed between the two sliding rods and is located outside the first fixed rod. A suction pipe is fixed to the ends of two corresponding sliding rods. A telescopic tube is fixed to the ends of the two suction pipes. Two suction grooves are formed in the middle of the suction pipe. Two scrapers are hinged to the middle of the suction pipe and are arranged opposite to each other. Through the above structure, the two sets of scrapers can promptly remove degraded plastic or foreign objects adhering to the surface of the calender roll, reducing the number of impurities pressed into the middle of the sheet metal by the calender roll, which would cause scratches and defects. The dust collection box, through negative pressure airflow, can reduce the scraped impurities from being rolled into the roll gap, keeping the calender roll and the sheet metal surface clean.

[0009] Preferably, the positioning component includes two sets of second sliders, which are installed on the top of the conveyor table. The top of the conveyor table has two second slide grooves, and each pair of second sliders is slidably connected to the middle of the second slide groove. A second spring is fixedly connected to the side wall of each pair of second sliders, and a second fixing rod is fixedly connected to the top of each pair of second sliders. A connecting plate is rotatably connected to the middle of the second fixing rod, and a positioning plate is hinged to the ends of the two connecting plates. The two positioning plates are arranged opposite to each other. With the above structure, when the plate deviates due to uneven tension or speed fluctuations, the positioning plate can automatically adjust the pressure direction to guide the plate to stay in the center position, reducing wrinkles, curling, or breakage caused by the plate deviating.

[0010] Preferably, the positioning plate has a mounting groove in the middle, and a rotating belt is installed in the mounting groove. The above structure can reduce the friction between the edge of the plate and the positioning plate, reduce the edge stress concentration caused by the tension fluctuation of the plate, and thus reduce the problems of edge indentation, scratches or deformation.

[0011] Preferably, a protective cover is fixed to the inner side wall of the frame, and a through groove is provided in the middle of the protective cover. The above structure can effectively reduce the direct contact between dust and impurities in the processing environment and the second gear and rack, and reduce the wear and damage caused by dust and impurities adhering to the surface of the second gear or rack.

[0012] Preferably, the outer wall of the conveyor roller is made of rubber. The elastic deformation of the rubber in the above-mentioned structure can absorb deformation energy, so that the conveyor roller and the plate always maintain uniform contact and reduce friction and wear caused by hard contact between the conveyor roller and the plate.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The four-roll calender for plastic sheets described in this utility model, through the above structure, can quickly adjust the gap between the two calendering rolls during the plastic calendering process, and can calender sheets of different thicknesses according to calendering requirements. It can adapt to the characteristics of different raw materials, so that various plastics can be stably molded, flexibly respond to different customer needs, quickly switch to produce sheets of different thicknesses, reduce sheet thickness production fluctuations, and reduce waste generation.

[0015] 2. The four-roll calender for plastic sheets described in this utility model, through the above-mentioned structure, can promptly remove degraded plastic or foreign matter adhering to the surface of the calendering rolls by two sets of scrapers, reducing the number of impurities that are pressed into the middle of the sheet through the calendering rolls and cause scratches. The dust collection box, through negative pressure airflow, can reduce the scraped impurities from being rolled into the roll gap, keeping the calendering rolls and the surface of the sheet clean. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is a schematic diagram of the rack structure in this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the adjustment component in this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the first slider in this utility model;

[0021] Figure 5 This is a schematic diagram of the cleaning component in this utility model;

[0022] Figure 6 This is a schematic diagram of the positioning component in this utility model.

[0023] In the diagram: 1. Frame; 11. Conveyor table; 12. Conveyor roller; 13. Calendering roller; 14. Motor; 2. Adjustment assembly; 20. Rotating shaft; 21. Adjustment groove; 22. Bidirectional lead screw; 23. Square nut; 24. First gear; 25. Second gear; 26. Rack; 27. First bevel gear; 28. Second bevel gear; 29. ​​Rotating handle; 201. First slider; 3. Cleaning assembly; 30. Telescopic tube; 31. First chute; 32. First fixed rod; 33. First spring; 34. Slide rod; 35. Suction pipe; 36. Suction trough; 37. Scraper; 38. Connecting pipe; 39. Suction box; 4. Positioning assembly; 41. Second chute; 42. Second slider; 43. Second spring; 44. Second fixed rod; 45. Connecting plate; 46. Positioning plate; 5. Mounting groove; 51. Rotating belt; 6. Protective cover; 61. Through groove. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] like Figures 1 to 6As shown, the four-roll calender for plastic sheets according to this embodiment of the present invention includes a frame 1, a conveyor table 11 installed at one end of the frame 1, a plurality of conveyor rollers 12 rotatably connected to the top of the conveyor table 11, a motor 14 fixedly connected to the side wall of the frame 1, an adjustment assembly 2 installed at the output end of the motor 14, a plurality of calendering rollers 13 installed in the middle of the frame 1, two of the calendering rollers 13 being installed in the middle of the adjustment assembly 2, a cleaning assembly 3 installed in the middle of the frame 1, a positioning assembly 4 installed at the top of the conveyor table 11, and the adjustment assembly 2 including a rotating shaft 20 rotatably connected to the side wall of the frame 1 and fixedly connected to the output end of the motor 14, a second gear 25 fixedly connected to the end of the rotating shaft 20, and two second gears 25 rotatably connected to the inner side wall of the frame 1. A rack 26 is installed in the middle. Two adjustment slots 21 are opened on the inner side wall of the frame 1. The two adjustment slots 21 are arranged opposite each other. The bottom of one adjustment slot 21 is rotatably connected to a first bevel gear 27. The middle of the first bevel gear 27 is meshed with a second bevel gear 28. The middle of the second bevel gear 28 is fixedly connected to a rotating handle 29, which is rotatably connected to the middle of the frame 1. The middle of the first bevel gear 27 is fixedly connected to a double-acting screw 22. The end of the double-acting screw 22 is rotatably connected to the top of the adjustment slot 21. Two square nuts 23 are installed in the middle of the double-acting screw 22. The middle of the square nuts 23 is rotatably connected to a first gear 24. The middle of one of the first gears 24 is meshed with the rack 26. Two first sliders are slidably connected in the middle of the other adjustment slot 21. 201. One end of the calendering roller 13 is fixed to the middle of the first gear 24, and the other end of the calendering roller 13 is rotatably connected to the middle of the first slider 201. During operation, when adjusting the distance between the two calendering rollers 13, the handle 29 is rotated first. The handle 29 drives the second bevel gear 28 to rotate, and the second bevel gear 28 drives the first bevel gear 27 to rotate. During the rotation of the first bevel gear 27, the double-acting screw 22 is rotated. At this time, the two square nuts 23 move towards the center position, and the square nuts 23 drive the first gear 24 to move. At the same time as the first gear 24 moves, the first slider 201 slides in the middle of the adjusting groove 21. When the first gear 24 and the first slider 201 drive the calendering roller 13 to move, one side of the first gear 24 is connected to the rack. The meshing setting of rollers 26 is achieved by rotating the square nut 23 as it moves. After the two calendering rollers 13 are adjusted to the specified distance, the control motor 14 is turned on. The motor 14 drives the rotating shaft 20 to rotate the second gear 25. The second gear 25 rotates simultaneously through the rack 26. The rack 26 drives one of the first gears 24 to rotate, causing the calendering roller 13 to rotate. The sheet material is conveyed between the two calendering rollers 13 by the conveying roller 12. The two calendering rollers 13 perform calendering work on the sheet material. After the first stage of calendering, the sheet material passes through the other two calendering rollers 13 for the second stage of calendering. The other two calendering rollers 13 can be set to be fixed or adjustable according to the requirements of the municipal bureau. Through the above structure, the gap between the two calendering rollers 13 can be quickly adjusted during the plastic calendering process.It can calender sheets of different thicknesses according to calendering requirements, adapt to the characteristics of different raw materials, and ensure stable molding of various plastics. It flexibly responds to different customer needs, quickly switches between producing sheets of different thicknesses, reduces production fluctuations in sheet thickness, and minimizes waste generation.

[0026] like Figures 2 to 5 As shown, the cleaning component 3 includes a dust collection box 39, which is fixedly connected to the top of the frame 1. A connecting pipe 38 is fixedly connected to the middle of the dust collection box 39. Two first sliding grooves 31 are opened on the inner side wall of the frame 1. A first fixed rod 32 is fixedly connected to the middle of the first sliding groove 31. Two sliding rods 34 are slidably connected to the middle of the first fixed rod 32. A first spring 33 is fixedly connected between the two sliding rods 34 and is located outside the first fixed rod 32. A suction pipe 35 is fixedly connected to the ends of the two corresponding sliding rods 34. A telescopic pipe 30 is fixedly connected to the ends of the two suction pipes 35. Two suction grooves 36 are opened in the middle of the suction pipes 35. Two scrapers 37 are hinged in the middle of the suction pipes 35. The two scrapers 37 are arranged opposite each other. When the two calendering rollers 13 are adjusted during operation, the corresponding scrapers move with the movement of the calendering rollers 13. Plate 37 rotates in the middle of suction pipe 35. A torsion spring is provided at the connection between suction pipe 35 and scraper 37. As the calendering roller 13 applies pressure, the suction pipe 35 drives the slide bar 34 to slide in the middle of the first slide groove 31. At this time, the first spring 33 elastically contracts, controlling the opening of the suction box 39. A high negative pressure airflow is generated inside the suction box 39. When the calendering roller 13 rotates, the scraper 37 scrapes off the surface impurities. The negative pressure airflow passes through the suction groove 36 to process the impurities in time and sucks them into the suction pipe 35. Then, it enters the suction box 39 through the connecting pipe 38 for collection. Through the above structure, the two sets of scrapers 37 can remove the degraded plastic or foreign objects adhering to the surface of the calendering roller 13 in time, reducing the impurities from being pressed into the middle of the sheet material by the calendering roller 13, which would cause scratches and defects. The collection by the negative pressure airflow through the suction box 39 can reduce the scraped impurities from being rolled into the roller gap, keeping the calendering roller 13 and the sheet material surface clean.

[0027] like Figure 1 and Figure 6As shown, the positioning assembly 4 includes two sets of second sliders 42, which are mounted on the top of the conveyor table 11. Two second slide grooves 41 are formed on the top of the conveyor table 11. Each pair of second sliders 42 is slidably connected to the middle of the second slide groove 41. Second springs 43 are fixed to the side walls of the two second sliders 42. Second fixing rods 44 are fixed to the top of the second sliders 42. A connecting plate 45 is rotatably connected to the middle of the second fixing rod 44. Positioning plates 46 are hinged to the ends of the two connecting plates 45. The two positioning plates 46 are arranged opposite to each other. During operation, when the sheet material is conveyed by the conveyor roller 12, the sheet material enters the two positioning plates 46. 6. On both sides, when the plate is large, the plate applies pressure to the positioning plate 46 on both sides. At this time, the connecting plate 45 rotates in the middle of the positioning plate 46 and in the middle of the second fixing rod 44. The two second sliders 42 slide in the middle of the second slide groove 41 as pressure is applied to the positioning plate 46. The second spring 43 is elastically stretched. The positioning plate 46 applies pressure evenly to both sides of the plate to position it in the center position. With the above structure, when the plate deviates due to uneven tension or speed fluctuation, the positioning plate 46 can automatically adjust the pressure direction to guide the plate to stay in the center position, reducing wrinkles, curling or breakage caused by the plate deviating.

[0028] like Figure 6 As shown, the positioning plate 46 has an installation groove 5 in the middle, and the installation groove 5 is equipped with a rotating belt 51. During operation, when the plate is positioned by the positioning plate 46, the rotating belt 51 rotates with the plate as the conveying roller 12 moves the plate. The above structure can reduce the friction between the edge of the plate and the positioning plate 46, reduce the edge stress concentration caused by the tension fluctuation of the plate, and thus reduce the problems of edge indentation, scratches or deformation.

[0029] like Figure 1 As shown, a protective cover 6 is fixed to the inner wall of the frame 1. A through groove 61 is provided in the middle of the protective cover 6. During operation, the protective cover 6 blocks dust and particulate impurities in the processing environment, thus protecting the second gear 25 and the rack 26. The end of the calendering roll 13 moves in the middle of the through groove 61. The above structure can effectively reduce the direct contact between dust and impurities in the processing environment and the second gear 25 and the rack 26, and reduce the wear and damage caused by dust and impurities adhering to the surface of the second gear 25 or the rack 26.

[0030] like Figure 6 As shown, the outer wall of the conveyor roller 12 is made of rubber. During operation, the flexible structure of the rubber automatically conforms to the surface contour of the plate. The elastic deformation of the rubber structure can absorb deformation energy, so that the conveyor roller 12 and the plate always maintain uniform contact and reduce friction and wear caused by hard contact between the conveyor roller 12 and the plate.

[0031] During operation, when adjusting the distance between the two calendering rollers 13, first rotate the handle 29. The handle 29 drives the second bevel gear 28 to rotate, which in turn drives the first bevel gear 27 to rotate. As the first bevel gear 27 rotates, it drives the bidirectional lead screw 22 to rotate. At this time, the two square nuts 23 move towards the center position, driving the first gear 24 to move. Simultaneously, the first slider 201 slides in the middle of the adjusting groove 21. When the first gear 24 and the first slider 201 drive the calendering rollers 13 to move, one side of the first gear 24 meshes with the rack 26, rotating as the square nut 23 moves. After the two calendering rollers 13 are adjusted to the specified spacing, the control motor 14 is turned on. The motor 14 drives the rotating shaft 20 to rotate the second gear 25. The second gear 25 rotates simultaneously through the rack 26. When the rack 26 drives one of the first gears 24 to rotate, the calendering roller 13 rotates. The sheet material is conveyed between the two calendering rollers 13 by the conveying roller 12. The two calendering rollers 13 perform calendering work on the sheet material. After the first stage of calendering, the sheet material passes through the other two calendering rollers 13 for the second stage of calendering. The other two calendering rollers 13 can be set to fixed or adjustable according to the requirements of the municipal bureau. When the two calendering rollers 13 are adjusted, the corresponding movement of the calendering rollers 13 corresponds to the movement of the sheet material. The scraper 37 rotates in the middle of the suction pipe 35. A torsion spring is provided at the connection between the suction pipe 35 and the scraper 37. As the calendering roller 13 applies pressure, the suction pipe 35 drives the slide rod 34 to slide in the middle of the first slide groove 31. At this time, the first spring 33 elastically contracts, controlling the opening of the suction box 39. A high negative pressure airflow is generated inside the suction box 39. When the calendering roller 13 rotates, it scrapes off the surface impurities by the scraper 37. The negative pressure airflow passes through the suction groove 36 to process the impurities in time and sucks them into the suction pipe 35. Then, it enters the suction box 39 through the connecting pipe 38 for collection. When the board is conveyed by the conveying roller 12, the board enters the two sides of the positioning plate 46. When the board is large, the two sides of the board are aligned with the positioning plate 46. 6. When pressure is applied, the connecting plate 45 rotates in the middle of the positioning plate 46 and in the middle of the second fixed rod 44. The two second sliders 42 slide in the middle of the second slide groove 41 as pressure is applied to the positioning plate 46. The second spring 43 is stretched elastically. The positioning plate 46 applies pressure evenly to both sides of the plate and positions it in the center. When the plate is positioned by the positioning plate 46, the rotating belt 51 rotates with the plate as the conveying roller 12 moves the plate. The protective cover 6 blocks dust and particulate impurities in the processing environment and protects the second gear 25 and rack 26. The end of the calendering roller 13 moves in the middle of the through groove 61. The flexible structure of the rubber automatically conforms to the surface contour of the plate.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. Four-roll plastic sheeting calender comprising a frame (1), characterized in that: A conveyor platform (11) is installed at the end of the frame (1). Multiple conveyor rollers (12) are rotatably connected to the top of the conveyor platform (11). A motor (14) is fixed to the side wall of the frame (1). An adjustment component (2) is installed at the output end of the motor (14). Multiple calendering rollers (13) are installed in the middle of the frame (1). Two of the calendering rollers (13) are installed in the middle of the adjustment component (2). A cleaning component (3) is installed in the middle of the frame (1). A positioning component (4) is installed on the top of the conveyor platform (11).

2. The plastic sheet four-roll calender according to claim 1, characterized in that: The adjustment assembly (2) includes a rotating shaft (20), which is rotatably connected to the side wall of the frame (1). The rotating shaft (20) is fixed to the output end of the motor (14). A second gear (25) is fixedly connected to the end of the rotating shaft (20). The second gear (25) is rotatably connected to the inner side wall of the frame (1). A rack (26) is installed in the middle of the two second gears (25). Two adjustment slots (21) are opened in the inner side wall of the frame (1). The two adjustment slots (21) are arranged opposite to each other. A first bevel gear (27) is rotatably connected to the bottom of one adjustment slot (21). A second bevel gear (28) is meshed in the middle of the first bevel gear (27). A rotating handle is fixedly connected to the middle of the second bevel gear (28). (29) The rotating handle (29) is rotatably connected to the middle of the frame (1). A bidirectional lead screw (22) is fixedly connected to the middle of the first bevel gear (27). The end of the bidirectional lead screw (22) is rotatably connected to the top of the adjusting groove (21). Two square nuts (23) are installed in the middle of the bidirectional lead screw (22). A first gear (24) is rotatably connected to the middle of the square nut (23). One of the first gears (24) is meshed with the rack (26). The other one is slidably connected to two first sliders (201) in the middle of the adjusting groove (21). One end of the calendering roller (13) is fixedly connected to the middle of the first gear (24). The other end of the calendering roller (13) is rotatably connected to the middle of the first slider (201).

3. The plastic sheet four-roll calender according to claim 1, characterized in that: The cleaning assembly (3) includes a dust collection box (39), which is fixedly connected to the top of the frame (1). A connecting pipe (38) is fixedly connected to the middle of the dust collection box (39). Two first sliding grooves (31) are opened on the inner side wall of the frame (1). A first fixing rod (32) is fixedly connected to the middle of the first sliding groove (31). Two sliding rods (34) are slidably connected to the middle of the first fixing rod (32). A first spring (33) is fixed between each of the sliding rods (34). The first spring (33) is located outside the first fixed rod (32). A suction pipe (35) is fixed to the end of each of the two corresponding sliding rods (34). A telescopic pipe (30) is fixed to the end of each of the two suction pipes (35). Two suction grooves (36) are opened in the middle of each suction pipe (35). Two scrapers (37) are hinged in the middle of each suction pipe (35). The two scrapers (37) are arranged opposite to each other.

4. The plastic sheet four-roll calender according to claim 1, wherein: The positioning component (4) includes two sets of second sliders (42), which are installed on the top of the conveyor table (11). The top of the conveyor table (11) has two second slide grooves (41). Each pair of second sliders (42) is slidably connected to the middle of the second slide groove (41). The side walls of the two second sliders (42) are fixedly connected to a second spring (43). The top of the second sliders (42) is fixedly connected to a second fixing rod (44). The middle of the second fixing rod (44) is rotatably connected to a connecting plate (45). The ends of the two connecting plates (45) are hinged to positioning plates (46). The two positioning plates (46) are arranged opposite to each other.

5. The plastic sheet four-roll calender according to claim 4, characterized in that: The positioning plate (46) has an installation groove (5) in the middle, and a rotating belt (51) is installed in the installation groove (5).

6. The plastic sheet four-roll calender according to claim 1, wherein: A protective cover (6) is fixed to the inner wall of the frame (1), and a through groove (61) is provided in the middle of the protective cover (6).

7. The plastic sheet four-roll calender according to claim 1, wherein: The outer wall of the conveying roller (12) is made of rubber.

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