Novel dustproof autorotation roller

Abstract

The novel dustproof autorotation roller comprises a mandrel and a roller which are coaxially arranged, annular step grooves are formed in the inner circles of the two end openings of the roller, and the annular step grooves in the two ends of the roller are rotationally connected with the outer circle of the mandrel through bearing assemblies respectively. End cover assemblies used for sealing and positioning the bearing assemblies are arranged at the positions, at the two ends of the roller, of the mandrel respectively. Labyrinth type sealing structures are arranged between the end cover assemblies and the bearing assemblies. The dustproof roller is scientific in principle, simple in structure and easy to manufacture and install, the dustproof performance is improved on the premise that free rotation of the roller is not affected, dust is basically prevented from making contact with the bearings, and therefore it is guaranteed that the roller can conveniently and freely rotate for a long time.

Description

Technical Field

[0001] The utility model belongs to the technical field of PVC calendering film production, and specifically relates to a novel dust-proof self-rotating roller. Background Art

[0002] In the production process of PVC calendered film, before the film is rolled up, a thin layer of ultrafine powder is sprinkled on the surface of the film to prevent it from getting dirty. Because the powder is very fine and light, it will float away when encountering a weak airflow. Before rolling up, several self-rotating rollers are set up. Bearings are set between the roller ends and the mandrel of the self-rotating roller. Such rollers are very light when they are passively rotated, so they are commonly called self-rotating rollers. The mandrel is a steel shaft and the roller is made of aluminum. Ultrafine powder particles can easily enter the two ends of the roller and enter between the balls of the bearings, causing the raceway of the bearing to accumulate powder and dry, and the rollers will not rotate as lightly as they did at the beginning. Therefore, it is urgent to improve the design of dustproof seals for the bearings at the ends of the rollers. Utility Model Content

[0003] The utility model is to solve the above technical problems and provide a novel dustproof self-rotating roller which has the advantages of simple structure, convenient assembly and disassembly, tight sealing and flexible rotation of the roller.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: a new type of dustproof self-rotating roller, including a core shaft and a roller arranged along the same axis, the inner circles of the two ends of the roller are provided with annular step grooves, the annular step grooves at both ends of the roller are rotatably connected to the outer circle of the core shaft through a bearing assembly respectively, and the core shaft is provided with end cover assemblies for sealing and positioning the bearing assemblies at both ends of the roller, and a labyrinth sealing structure is provided between the end cover assembly and the bearing assembly.

[0005] The two bearing assemblies have the same structure and are symmetrically arranged on the left and right. The bearing assembly on the left includes a bearing seat mounted on the core shaft. The outer circle of the bearing seat is interference fitted with the inner circle of the step groove. The right end of the bearing seat is press-fitted with the annular step of the step groove. The left end of the bearing seat is open. A bearing is installed in the bearing seat. The outer circle of the bearing is interference fitted with the inner circle of the bearing seat, and the inner circle of the bearing is interference fitted with the outer circle of the core shaft.

[0006] The two end cover assemblies have the same structure and are symmetrically arranged on the left and right. The end cover assembly on the left side includes an end panel mounted on the outer circle of the core shaft. The left side of the end panel is integrally provided with a positioning sleeve mounted on the core shaft. The inner circle of the positioning sleeve is provided with a sealing ring that is press-fitted with the outer circle of the core shaft. A fastening screw is threadedly connected to the positioning sleeve along the radial direction. The inner end of the fastening screw is press-fitted with the outer circle of the core shaft. The right side of the end panel is integrally provided with a positioning pressure ring that is press-fitted with the left end ring surface of the inner ring of the bearing.

[0007] The labyrinth seal structure includes a plurality of circular grooves and circular convex rings coaxial with the core shaft, all of the circular grooves are provided on the outer end face of the bearing seat, and all of the circular convex rings are provided on the inner side face of the end panel. The number of circular grooves and circular convex rings is equal and corresponds to each other on the left and right sides. The circular convex rings extend into the circular grooves with a gap of 0.3-0.5mm to form a labyrinth seal structure.

[0008] There is a gap of 0.3-0.5mm between the inner side of the end panel and the outer end face of the bearing seat and the end face of the roller. The outer circle of the end panel is integrally provided with a sealing sleeve that is sleeved on the outer circle of the roller end. There is a gap of 0.3-0.5mm between the sealing sleeve and the outer circle of the roller.

[0009] By adopting the above technical solution, compared with the prior art, the utility model has the following technical effects:

[0010] 1. The end cover assembly is fixedly connected to the core shaft. The end cover assembly is used to seal and position the bearing assembly. The labyrinth seal structure is used to prevent dust from entering the bearing. It not only has a good dustproof effect, but also does not affect the free rotation of the roller.

[0011] 2. Set a step groove on the inner circle of the roller end face and add a bearing seat (the outer circle of the bearing is not directly assembled with the inner circle of the step groove). This makes it convenient to machine a circular groove on the outer end ring surface of the bearing seat.

[0012] 3. The labyrinth seal structure uses multiple concentric circular convex rings that extend into multiple concentric circular grooves, which can achieve a good sealing effect and make it difficult for ultrafine powder to enter the bearing.

[0013] 4. The positioning sleeve is used to position and install the end panel. The fixing screw is used to press the mandrel, which is convenient for installation and cleaning the dust in the gap after disassembly. The sealing ring can prevent dust from entering the bearing through the gap between the positioning sleeve and the mandrel.

[0014] 5. The setting of the sealing sleeve forms a cylindrical gap between the inner circle of the sealing sleeve and the outer circle of the roller, which extends the gap length between the bearing and further improves the dustproof effect.

[0015] 6. The size of the gap is 0.3-0.5 mm, which not only ensures good free rotation performance between the roller, the end panel and the sealing sleeve, but also the smaller gap prevents the entry of dust.

[0016] In summary, the utility model has a scientific principle, a simple structure, and is easy to manufacture and install. Without affecting the free rotation of the roller, the dust-proof performance is improved, and dust is basically prevented from contacting the bearing, thereby ensuring that the roller can rotate freely and lightly for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the plane structure of the utility model;

[0018] Figure 2 yes Figure 1 Enlarged view of part A in the middle. DETAILED DESCRIPTION

[0019] The implementation of the utility model is further described in detail below in conjunction with the drawings and examples.

[0020] like Figure 1 and Figure 2 As shown, a new type of dust-proof self-rotating roller of the utility model comprises a core shaft 1 and a roller 2 arranged along the same axis, the inner circles of the two ends of the roller 2 are provided with annular step grooves, the annular step grooves at both ends of the roller 2 are rotatably connected with the outer circle of the core shaft 1 through a bearing assembly 3 respectively, and the core shaft 1 is provided with end cover assemblies 4 for sealing and positioning the bearing assembly 3 at both ends of the roller 2, and a labyrinth sealing structure is provided between the end cover assembly 4 and the bearing assembly 3.

[0021] The two bearing assemblies 3 have the same structure and are symmetrically arranged on the left and right. The bearing assembly 3 on the left includes a bearing seat 5 mounted on the core shaft 1. The outer circle of the bearing seat 5 is interference fit with the inner circle of the step groove. The right end of the bearing seat 5 is press-fitted with the annular step of the step groove. The left end of the bearing seat 5 is open. A bearing 6 is installed in the bearing seat 5. The outer circle of the bearing 6 is interference fit with the inner circle of the bearing seat 5, and the inner circle of the bearing 6 is interference fit with the outer circle of the core shaft 1.

[0022] The two end cover assemblies 4 have the same structure and are symmetrically arranged on the left and right. The end cover assembly 4 on the left side includes an end panel 7 which is sleeved on the outer circle of the core shaft 1. The left side of the end panel 7 is integrally provided with a positioning sleeve 8 which is sleeved on the core shaft 1. The inner circle of the positioning sleeve 8 is provided with a sealing ring 9 which is press-fitted with the outer circle of the core shaft 1. A fastening screw 10 is threadedly connected to the positioning sleeve 8 along the radial direction. The inner end of the fastening screw 10 is press-fitted with the outer circle of the core shaft 1. The right side of the end panel 7 is integrally provided with a positioning pressure ring 11 which is press-fitted with the left end ring surface of the inner ring of the bearing 6.

[0023] The labyrinth seal structure includes a plurality of circular grooves 12 and circular convex rings 13 which are coaxial with the core shaft 1. All the circular grooves 12 are provided on the outer end surface of the bearing seat 5, and all the circular convex rings 13 are provided on the inner side surface of the end panel 7. The number of the circular grooves 12 and the circular convex rings 13 are equal and correspond one to one on the left and right. The circular convex rings 13 extend into the circular grooves 12 and have a gap of 0.3-0.5 mm to form a labyrinth seal structure.

[0024] There is a gap of 0.3-0.5mm between the inner side of the end panel 7 and the outer end surface of the bearing seat 5 and the end surface of the roller 2. The outer circle of the end panel 7 is integrally provided with a sealing sleeve 14 which is sleeved on the outer circle of the end of the roller 2. There is a gap of 0.3-0.5mm between the sealing sleeve 14 and the outer circle of the roller 2.

[0025] The utility model has the following technical effects:

[0026] 1. The end cover assembly 4 is fixedly connected to the core shaft 1. The end cover assembly 4 is used to seal and position the bearing 6 assembly 3. The dustproof of the bearing 6 is achieved through the labyrinth seal structure, which not only has a good dustproof effect but also does not affect the free rotation of the roller 2.

[0027] 2. A step groove is provided on the inner circle of the end face of the roller 2 and a bearing seat 5 is added (the outer circle of the bearing 6 is not directly assembled with the inner circle of the step groove). This makes it convenient to process a circular groove 12 on the outer end ring surface of the bearing seat 5.

[0028] 3. The labyrinth seal structure uses a plurality of concentric circular convex rings 13 to extend into a plurality of concentric circular grooves 12 , which can achieve a good sealing effect and make it difficult for ultrafine powder to enter the bearing 6 .

[0029] 4. The positioning sleeve 8 is used to position and install the end panel 7. The fastening screw 10 is used to press the core shaft 1, which is convenient for installation and cleaning the dust in the gap after disassembly. The sealing ring 9 can prevent dust from entering the bearing 6 through the gap between the positioning sleeve 8 and the core shaft 1.

[0030] 5. The provision of the sealing sleeve 14 allows the cylindrical gap formed between the inner circle of the sealing sleeve 14 and the outer circle of the roller 2 to extend the gap length between the bearing 6, further improving the dustproof effect.

[0031] 6. The size of the gap is 0.3-0.5 mm, which not only ensures good free rotation performance between the roller 2 and the end panel 7 and the sealing sleeve 14, but also prevents the entry of dust due to the smaller gap.

[0032] The above embodiments illustrate the basic principles and features of the utility model, but the above only illustrates the preferred embodiments of the utility model and is not limited by the embodiments. Under the inspiration of this patent, ordinary technicians in this field can also make many forms of deformation and improvement without departing from the purpose of the utility model and the scope of protection of the claims, which are all within the scope of protection of the utility model. Therefore, the patent and protection scope of the utility model shall be subject to the attached claims.

Claims

1. A new type of dustproof self-rotating roller, comprising a core shaft and a roller arranged along the same axis, and an annular step groove is provided on the inner circle of both ends of the roller, characterized in that: The annular step grooves at both ends of the roller are rotatably connected to the outer circle of the core shaft through a bearing assembly. The core shaft is provided with end cover assemblies for sealing and positioning the bearing assemblies at both ends of the roller, and a labyrinth sealing structure is provided between the end cover assembly and the bearing assembly.

2. The novel dust-proof self-rotating roller according to claim 1 is characterized in that: The two bearing assemblies have the same structure and are symmetrically arranged on the left and right. The bearing assembly on the left includes a bearing seat mounted on the core shaft. The outer circle of the bearing seat is interference fitted with the inner circle of the step groove. The right end of the bearing seat is press-fitted with the annular step of the step groove. The left end of the bearing seat is open. A bearing is installed in the bearing seat. The outer circle of the bearing is interference fitted with the inner circle of the bearing seat, and the inner circle of the bearing is interference fitted with the outer circle of the core shaft.

3. The novel dust-proof self-rotating roller according to claim 2 is characterized in that: The two end cover assemblies have the same structure and are symmetrically arranged on the left and right. The end cover assembly on the left side includes an end panel mounted on the outer circle of the core shaft. The left side of the end panel is integrally provided with a positioning sleeve mounted on the core shaft. The inner circle of the positioning sleeve is provided with a sealing ring that is press-fitted with the outer circle of the core shaft. A fastening screw is threadedly connected to the positioning sleeve along the radial direction. The inner end of the fastening screw is press-fitted with the outer circle of the core shaft. The right side of the end panel is integrally provided with a positioning pressure ring that is press-fitted with the left end ring surface of the inner ring of the bearing.

4. The novel dust-proof self-rotating roller according to claim 3 is characterized in that: The labyrinth seal structure includes a plurality of circular grooves and circular convex rings coaxial with the core shaft, all of the circular grooves are provided on the outer end face of the bearing seat, and all of the circular convex rings are provided on the inner side face of the end panel. The number of circular grooves and circular convex rings is equal and corresponds to each other on the left and right sides. The circular convex rings extend into the circular grooves with a gap of 0.3-0.5mm to form a labyrinth seal structure.

5. A novel dust-proof self-rotating roller according to claim 3 or 4, characterized in that: There is a gap of 0.3-0.5mm between the inner side of the end panel and the outer end face of the bearing seat and the end face of the roller. The outer circle of the end panel is integrally provided with a sealing sleeve that is sleeved on the outer circle of the roller end. There is a gap of 0.3-0.5mm between the sealing sleeve and the outer circle of the roller.

Images