A device for reducing the gap of a sizing machine

Abstract

This application relates to the field of grading machine technology and discloses a device for reducing gaps in grading machines. The device includes a grading wheel disposed within the grading machine housing, a cover disposed on the top of the grading machine housing, and a gap sealing mechanism disposed between the grading wheel and the cover. The cover is detachably mounted and fixed to the top of the grading machine housing. The gap sealing mechanism includes a thermal expansion sealing ring, a fixing ring, a sealing ring, and a spring. The thermal expansion sealing ring is fixedly mounted on the top of the grading wheel, and the fixing ring is detachably mounted and fixed to the bottom of the cover. An annular groove is formed at the bottom of the fixing ring, and the top of the sealing ring is slidably mounted within the annular groove, with the bottom of the sealing ring abutting against the top of the thermal expansion sealing ring. This application has the following advantages and effects: it can form a dual sealing effect of active thermal expansion sealing and passive elastic compression, ensuring efficient sealing performance of the gap between the grading wheel and the cover.

Description

Technical Field

[0001] This application relates to the field of grading machine technology, and in particular to a device for reducing the gap in a grading machine. Background Technology

[0002] A classifier is an industrial device used for separating powder particles by size, widely used in building materials, chemicals, and mineral processing industries. The classification accuracy of a classifier directly determines the quality of downstream products and production efficiency. The working principle of a classifier is that the high-speed rotation of the classifying wheel generates centrifugal force, separating materials according to particle size differences. Larger particles are thrown against the inner wall of the casing by centrifugal force and discharged through a specific channel, while smaller particles enter the classifying wheel with the airflow and are output through a collection pipe. During this process, the sealing performance of the gap between the classifying wheel and the top cover is a key factor affecting classification accuracy. If the gap seal fails, larger particles will enter the collection channel for smaller particles, or smaller particles will remain in the area containing larger particles, causing the classification results to deviate from design requirements. In severe cases, this can even lead to batch defects and production rework. Therefore, a gap sealing structure is installed between the classifying wheel and the top cover.

[0003] In existing technologies, the gap sealing structure between the classifying wheel and the top cover mostly uses a metal annular retaining ring or sealing gasket, which is directly fixed to one side of the classifying wheel or the cover. The gap accuracy between the retaining ring and the mating surface is ensured by machining. However, when the classifying machine is running, due to the high-speed rotation of the classifying wheel (the speed can usually reach 1000-5000 r / min), the metal retaining ring and the mating surface are prone to wear due to friction, which causes the gap to gradually increase over time and the sealing performance to become worse and worse. At the same time, during the operation of the classifying machine, the difference in the thermal expansion coefficients of the materials of the classifying wheel and the machine housing will cause temperature difference deformation, which will further destroy the gap stability of the rigid seal and increase the replacement frequency of the annular retaining ring or sealing gasket.

[0004] Therefore, we propose a device to reduce the gap in the classifier to solve the above problems. Utility Model Content

[0005] The purpose of this application is to provide a device for reducing the gap in a classifier, which has a dual sealing effect of active thermal expansion sealing and elastic passive compression, thereby ensuring efficient sealing performance of the gap between the classifier wheel and the housing cover.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution: a device for reducing the gap of a classifier, comprising a classifying wheel disposed inside the classifier housing, a cover disposed on the top of the classifier housing, and a gap sealing mechanism disposed between the classifying wheel and the cover. The cover is detachably installed and fixed on the top of the classifier housing. The gap sealing mechanism comprises a thermal expansion sealing ring, a fixing ring, a sealing ring, and a spring. The thermal expansion sealing ring is fixedly installed on the top of the classifying wheel. The fixing ring is detachably installed and fixed on the bottom of the cover. An annular groove is provided at the bottom of the fixing ring. The top of the sealing ring is slidably installed in the annular groove. The bottom of the sealing ring abuts against the top of the thermal expansion sealing ring. The spring is fixedly installed on the top of the sealing ring. The top of the spring is fixedly connected to the inner wall of the top of the annular groove.

[0007] A further feature of this application is that the number of springs is set to multiple, and the multiple springs are distributed in a ring with equal spacing.

[0008] A further provision of this application is that the top of the sealing ring is provided with a plurality of guide grooves that are equally spaced and distributed in annularly, and a plurality of guide rods that are equally spaced and distributed in annularly are fixedly installed on the top inner wall of the annular grooves, with the bottom ends of the plurality of guide rods being slidably installed in the corresponding guide grooves.

[0009] A further provision of this application is that the outer ring wall of the sealing ring slides and seals against the outer ring wall of the annular groove, and the inner ring wall of the sealing ring slides and seals against the inner ring wall of the annular groove.

[0010] A further provision of this application is that the cross-sectional dimension of the sealing ring is smaller than that of the thermal expansion sealing ring.

[0011] A further feature of this application is that three equally spaced mounting ears are fixedly installed on the outer ring wall of the fixing ring, and all three mounting ears are fixedly connected to the bottom of the shell cover by screws.

[0012] A further provision of this application is that a drive shaft is rotatably mounted on the bottom of the grading machine housing, the top end of the drive shaft extends into the grading machine housing and is fixedly connected to the bottom of the grading wheel, and a motor is fixedly mounted on the bottom of the grading machine housing via a bracket, with the output shaft end of the motor fixedly connected to the bottom end of the drive shaft.

[0013] A further provision of this application is that: a mounting hole is provided at the bottom of the grading machine housing, a bearing is fixedly sleeved on the drive shaft, and the outer ring of the bearing is fixedly connected to the inner wall of the mounting hole.

[0014] This application includes at least one of the following beneficial technical effects:

[0015] This application utilizes a gap sealing mechanism composed of a thermal expansion sealing ring, a fixed ring, a sealing ring, and a spring. The spring continuously provides downward elastic pressure to the sealing ring, ensuring a tight fit between the sealing ring and the thermal expansion sealing ring. Furthermore, as the temperature rises during the classifier's operation, the thermal expansion sealing ring expands due to heat, further enhancing the sealing effect. Without manual adjustment, it can maintain optimal gap control between the sealing ring and the thermal expansion sealing ring under different operating conditions, ensuring good sealing performance between the classifying wheel and the housing cover. This provides greater adaptability and creates a dual sealing effect of active thermal expansion sealing and passive elastic compression, ensuring highly efficient sealing performance of the gap between the classifying wheel and the housing cover. Attached Figure Description

[0016] Figure 1 This is a front-view stereoscopic structural diagram of this embodiment.

[0017] Figure 2 This is a front view sectional three-dimensional structural schematic diagram of this embodiment.

[0018] Figure 3 This is a front-view three-dimensional structural diagram of the grading wheel and the gap sealing mechanism.

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the sealing ring.

[0020] In the diagram, 1. Classifier housing; 2. Classification wheel; 3. Housing cover; 4. Thermal expansion sealing ring; 5. Fixing ring; 6. Annular groove; 7. Sealing ring; 8. Spring; 9. Guide groove; 10. Guide rod; 11. Assembly ear; 12. Drive shaft; 13. Motor; 14. Bearing. Detailed Implementation

[0021] The technical solution of this application will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] See Figure 1 , Figure 2 , Figure 3 and Figure 4This application provides a device for reducing the gap in a classifier, including a classifying wheel 2 disposed inside a classifier housing 1, a cover 3 disposed on the top of the classifier housing 1, and a gap sealing mechanism disposed between the classifying wheel 2 and the cover 3. The cover 3 is detachably and fixedly installed on the top of the classifier housing 1. The gap sealing mechanism includes a thermal expansion sealing ring 4, a fixing ring 5, a sealing ring 7, and a spring 8. The thermal expansion sealing ring 4 is fixedly installed on the top of the classifying wheel 2. The thermal expansion sealing ring 4 can be made of expandable graphite material, which has the advantages of wear resistance, corrosion resistance, and thermal expansion. The fixing ring 5 is detachably and fixedly installed on the cover 3. At the bottom, the bottom of the fixing ring 5 has an annular groove 6. The top of the sealing ring 7 is slidably installed in the annular groove 6, and the bottom of the sealing ring 7 abuts against the top of the thermal expansion sealing ring 4. The sealing ring 7 can be made of polytetrafluoroethylene or zirconium oxide ceramic. The spring 8 is fixedly installed on the top of the sealing ring 7, and the top of the spring 8 is fixedly connected to the inner wall of the top of the annular groove 6. The number of springs 8 is set to multiple, and the multiple springs 8 are distributed in an equally spaced ring. By designing multiple equally spaced annularly distributed springs 8, the downward pressure applied to the sealing ring 7 can be balanced, ensuring the complete tight fit between the sealing ring 7 and the thermal expansion sealing ring 4. By designing a combined structure of thermal expansion sealing ring 4, spring 8, and sealing ring 7, double sealing protection can be achieved. The thermal expansion sealing ring 4, made of expandable graphite material, expands with the heat generated during the classifier's operation, actively filling the tiny gap between the classifying wheel 2 and the sealing ring 7. Simultaneously, spring 8 consistently provides downward elastic pressure to the sealing ring 7, ensuring a tight fit between the sealing ring 7 and the thermal expansion sealing ring 4. Even with slight vibrations or component wear during equipment operation, the elastic compensation of spring 8 maintains the fit, effectively preventing material mixing caused by increased gap between the classifying wheel 2 and the cover 3, significantly improving efficiency. This design enhances sealing reliability. Furthermore, by combining the elastic compensation of spring 8 with the thermal expansion characteristics of the thermal expansion sealing ring 4, it can adapt to changes in the temperature difference during the start-up and shutdown of the classifier, load fluctuations, and other factors. When the initial temperature is low during startup, the preload of spring 8 can ensure the basic seal between the sealing ring 7 and the thermal expansion sealing ring 4. As the temperature rises during the operation of the classifier, the thermal expansion sealing ring 4 expands due to heat, which can further enhance the sealing effect. Without manual adjustment, it can continuously maintain the optimal gap control between the sealing ring 7 and the thermal expansion sealing ring 4 under different working conditions, maintaining good sealing performance between the classifier wheel 2 and the shell cover 3, and has stronger adaptability.

[0023] In this embodiment, the top of the sealing ring 7 is provided with multiple guide grooves 9 arranged in an evenly spaced ring. Multiple guide rods 10 arranged in an evenly spaced ring are fixedly installed on the top inner wall of the annular groove 6. The bottom ends of the multiple guide rods 10 are slidably installed in the corresponding guide grooves 9. The sliding sealing cooperation between the guide rods 10 and the guide grooves 9 guides the movement direction of the sealing ring 7, ensuring that the sealing ring 7 moves smoothly and vertically within the annular groove 6. The outer ring wall of the sealing ring 7 is slidably sealed to the outer ring wall of the annular groove 6, and the inner ring wall of the sealing ring 7 is slidably sealed to the inner ring wall of the annular groove 6. This ensures an effective seal between the sealing ring 7 and the annular groove 6, and allows the sealing ring 7 to slide smoothly downward within the annular groove 6. The cross-sectional dimension of the sealing ring 7 is smaller than that of the thermal expansion sealing ring 4, further improving the sealing effect of the gap between the grader wheel 2 and the shell cover 3.

[0024] In this embodiment, three equally spaced mounting ears 11 are fixedly installed on the outer ring wall of the fixing ring 5. All three mounting ears 11 are fixedly connected to the bottom of the shell cover 3 by screws, which facilitates the assembly and disassembly of the fixing ring 5.

[0025] In this embodiment, a drive shaft 12 is rotatably mounted on the bottom of the grading machine housing 1. The top end of the drive shaft 12 extends into the grading machine housing 1 and is fixedly connected to the bottom of the grading wheel 2. A motor 13 is fixedly mounted on the bottom of the grading machine housing 1 via a bracket. The output shaft end of the motor 13 is fixedly connected to the bottom end of the drive shaft 12. The motor 13 is a commercially available high-speed motor. The motor 13 is used to control the rotation of the drive shaft 12, thereby driving the grading wheel 2 to rotate at high speed. A mounting hole is provided at the bottom of the grading machine housing 1. A bearing 14 is fixedly sleeved on the drive shaft 12. The outer ring of the bearing 14 is fixedly connected to the inner wall of the mounting hole. The design of the bearing 14 can ensure the stability and smoothness of the drive shaft 12 during rotation.

[0026] In this embodiment, as Figure 1 and Figure 2 As shown, a suction pipe is fixedly installed on the top of the shell cover 3. The bottom end of the suction pipe penetrates the shell cover 3. The suction pipe is used to suck up the large-diameter material screened inside the classifying wheel 2. A suction pipe is fixedly installed on the right outer wall of the classifier shell 1. The left end of the suction pipe extends into the classifier shell 1. The suction pipe is used to suck up the small-diameter material screened outside the classifying wheel 2. The classifier shell 1 is also equipped with accessories such as a feed pipe, which are conventional parts in the field of classifiers and will not be described in detail in this article.

[0027] With the above structure, the working principle of the device for reducing the gap of the classifier provided in this application is as follows:

[0028] When the classifier is started and motor 13 is activated, the classifying wheel 2 rotates at high speed to screen the material. Multiple springs 8 continuously provide downward elastic pressure to the sealing ring 7, pushing it downwards along the direction of the guide rod 10 and guide groove 9. This ensures that the bottom of the sealing ring 7 tightly abuts against the thermal expansion sealing ring 4 at the top of the classifying wheel 2. The pre-pressure of the springs 8 forms a seal, ensuring effective sealing between the sealing ring 7 and the thermal expansion sealing ring 4. This guarantees good sealing performance between the classifying wheel 2 and the cover 3, preventing material movement. Furthermore, after the classifier has been running for a period of time, the high-speed rotation of the thermal expansion sealing ring 4 driven by the classifying wheel 2 generates heat due to the rotation of the classifying wheel 2 and friction between the material. The friction between the thermal expansion sealing ring 4 and the sealing ring 7 generates heat, causing the temperature inside the classifier housing 1 to gradually rise. At this time, the thermal expansion sealing ring 4, made of expandable graphite material, expands in volume as the temperature rises, actively filling the tiny gap between the classifying wheel 2 and the sealing ring 7. At the same time, it applies upward pressure to the sealing ring 7, further enhancing the sealing performance between the sealing ring 7 and the thermal expansion sealing ring 4. Moreover, the spring 8 always remains in an elastic compression state, converting the expansion force of the thermal expansion sealing ring 4 into a tighter fitting pressure through the sealing ring 7. This forms a dual sealing effect of active thermal expansion sealing and passive elastic compression, completely blocking the path of material mixing through the gap and achieving a highly efficient sealing effect between the classifying wheel 2 and the housing cover 3.

Claims

1. A device for reducing the gap in a classifier, characterized in that, The system includes a grading wheel (2) installed inside the grading machine housing (1), a cover (3) installed on the top of the grading machine housing (1), and a gap sealing mechanism installed between the grading wheel (2) and the cover (3). The cover (3) is detachably installed and fixed on the top of the grading machine housing (1). The gap sealing mechanism includes a thermal expansion sealing ring (4), a fixing ring (5), a sealing ring (7), and a spring (8). The thermal expansion sealing ring (4) is fixedly installed on the top of the grading wheel (2). The fixing ring (5) is detachably installed and fixed on the bottom of the cover (3). The bottom of the fixing ring (5) has an annular groove (6). The top of the sealing ring (7) is slidably installed in the annular groove (6). The bottom of the sealing ring (7) abuts against the top of the thermal expansion sealing ring (4). The spring (8) is fixedly installed on the top of the sealing ring (7). The top of the spring (8) is fixedly connected to the top inner wall of the annular groove (6).

2. The device for reducing the gap in a classifier according to claim 1, characterized in that: The number of springs (8) is set to multiple, and the multiple springs (8) are distributed in a ring with equal spacing.

3. The device for reducing the gap of a classifier according to claim 1, characterized in that: The top of the sealing ring (7) is provided with a plurality of guide grooves (9) that are evenly spaced and distributed in annular shape. A plurality of guide rods (10) that are evenly spaced and distributed in annular shape are fixedly installed on the top inner wall of the annular groove (6). The bottom ends of the plurality of guide rods (10) are slidably installed in the corresponding guide grooves (9).

4. The device for reducing the gap of a classifier according to claim 1, characterized in that: The outer ring wall of the sealing ring (7) is slidably sealed to the outer ring wall of the annular groove (6), and the inner ring wall of the sealing ring (7) is slidably sealed to the inner ring wall of the annular groove (6).

5. The device for reducing the gap of a classifier according to claim 4, characterized in that: The cross-sectional dimension of the sealing ring (7) is smaller than that of the thermal expansion sealing ring (4).

6. The device for reducing the gap of a classifier according to claim 1, characterized in that: Three mounting ears (11) are fixedly installed on the outer ring wall of the fixing ring (5) and are distributed at equal intervals. All three mounting ears (11) are fixedly connected to the bottom of the shell cover (3) by screws.

7. The device for reducing the gap of a classifier according to claim 1, characterized in that: A drive shaft (12) is rotatably mounted on the bottom of the grading machine housing (1). The top end of the drive shaft (12) extends into the grading machine housing (1) and is fixedly connected to the bottom of the grading wheel (2). A motor (13) is fixedly mounted on the bottom of the grading machine housing (1) by a bracket. The output shaft end of the motor (13) is fixedly connected to the bottom end of the drive shaft (12).

8. The apparatus for reducing the gap of a classifier according to claim 7, characterized in that: The bottom of the grading machine housing (1) is provided with an installation hole, and a bearing (14) is fixedly sleeved on the drive shaft (12). The outer ring of the bearing (14) is fixedly connected to the inner wall of the installation hole.

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