A sealing device for the bearing of a rotating blade of a plastic granulator

Abstract

The invention discloses a sealing device for a rotating blade bearing of a plastic granulator, belongs to the technical field of plastic granulators, solves the problem of influence of powder particles on the reliability of equipment use, and its technical scheme mainly includes an extrusion ring, a cooling disk, a sealing sleeve, a sealing plate, a bearing mounting seat, a cutter disc bearing, a cutter disc gear, and a rotating cutter disc; the extrusion ring is sleeved and fixed on the cooling disk, the sealing sleeve is embedded and fixed in the cooling disk, the bearing mounting seat is located at the outer side of the cooling disk and sleeved on the cutter disc bearing, the cutter disc gear is sleeved and fixed on the outer side of the cutter disc bearing, a gasket is arranged between the rotating cutter disc and the cutter disc gear to reserve a height for placing the sealing plate, the rotating cutter disc is fixed above the cutter disc gear by bolts, the sealing plate is fixed on the bearing mounting seat and covers the cutter disc bearing, so that all tiny particles are ejected under the centrifugal force generated by the cutter disc gear, the bearing sealing effect is achieved, and the overall reliability of use is improved.

Description

Technical Field

[0001] The invention relates to the field of plastic granulators, in particular to a bearing sealing device for a rotating blade of a plastic granulator. Background Art

[0002] Generally speaking, a plastic granulator has an extrusion ring with a through hole on its side wall. A spiral feed shaft is inserted into the extrusion ring. The spiral feed shaft will convey and compress the material so that the material is extruded from the through hole in a fluid state, and then cut and granulated by the cutter disc. The spiral feed shaft needs to be reliably fixed by a large bearing during assembly. A gap needs to be left at the installation position of the large bearing to facilitate the rotation of the spiral feed shaft and the rotation of the cutter disc. The diameter of the rotating cutter disc bearing is usually large and difficult to seal. During the operation of the plastic granulator, a lot of plastic dust will be generated when the rotating cutter disc is cutting. This dust can easily enter the above-mentioned gap, thereby greatly reducing the service life of the bearing. In order to solve the problem of escape and cleaning of fine plastic particles in the plastic granulator, the structure needs to be designed and modified. Summary of the invention

[0003] The purpose of the present invention is to address the deficiencies of the prior art and at least to some extent solve the technical problems in the related technology, and to provide a plastic granulator rotary blade bearing sealing device to achieve the purpose of improving the bearing sealing performance, reducing the impact of dust particles, and improving the reliability of equipment use.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a plastic granulator rotary blade bearing sealing device, comprising an extrusion ring, a cooling plate, a sealing sleeve, a sealing plate, a bearing mounting seat, a cutter disc bearing, a cutter disc gear, and a rotating cutter disc;

[0005] The extrusion ring is sleeved and fixed on the cooling disk, the sealing sleeve is embedded and fixed in the cooling disk, the bearing mounting seat is located outside the cooling disk and sleeved on the cutter disc bearing, the cutter disc bearing outer shell is sleeved and fixed on the cutter disc gear, a gasket is arranged between the rotating cutter disc and the cutter disc gear to reserve a height for placing the sealing plate, the rotating cutter disc is fixed above the cutter disc gear by bolts, and the sealing plate is fixed on the bearing mounting seat and covers the cutter disc bearing.

[0006] As a specific solution of the present invention, it may be preferred that: a shielding portion is provided on the cutter disc gear, the shielding portion is located above the cutter disc bearing, and a sealing plate is stacked above the shielding portion.

[0007] As a specific solution of the present invention, it can be preferred that: an annular hollow groove is opened at the bottom of the cooling plate, and the sealing sleeve closes the opening of the hollow groove.

[0008] As a specific solution of the present invention, it can be preferred that: the inner wall of the sealing sleeve is provided with a material withdrawal thread, and the thread direction of the material withdrawal thread is opposite to the rotation direction of the spiral feeding shaft.

[0009] As a specific solution of the present invention, it can be preferred that: a plurality of sealing rings are arranged on the contact surface between the cooling plate and the sealing sleeve, and the sealing rings are respectively located at both sides of the opening of the empty groove and the upper end of the sealing sleeve.

[0010] As a specific solution of the present invention, it may be preferred that: the root of the sealing sleeve is tightly fitted in the empty groove position by bolts.

[0011] As a specific solution of the present invention, it may be preferred that: an inlet interface and an outlet interface are provided at the root of the sealing sleeve.

[0012] The technical effects of the present invention are mainly reflected in the following aspects: all tiny particles are thrown out under the centrifugal force generated by the cutter disc gear, achieving the effect of sealing the bearing; the parts have a simple structure and the parts processing accuracy is easy to ensure; the inner wall of the sealing sleeve is processed with threads, and the spiral conveying shaft passes through the sealing sleeve. When tiny particles enter along the gap between the spiral conveying shaft and the sealing sleeve, they will be blocked by the left-handed threads. The root plane of the sealing sleeve is pressed by the bolt to prevent the cooling water in the cooling plate from overflowing. This sealing sleeve has dual functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram in the embodiment;

[0014] Figure 2 for Figure 1 A magnified view of part A;

[0015] Figure 3 This is a schematic diagram of the stripping thread structure of an embodiment;

[0016] Figure 4 This is a schematic diagram of the working assembly effect.

[0017] Figure numerals: 1. extrusion ring; 2. cooling plate; 21. empty groove; 22. opening; 23. withdrawal thread; 24. inlet interface; 25. outlet interface; 3. sealing sleeve; 4. sealing plate; 5. bearing mounting seat; 6. cutter disc bearing; 7. cutter disc gear; 71. shielding part; 8. rotating cutter disc; 9. gasket; 10. bolt; 11. sealing ring; 12. screw conveyor shaft; 13. blade. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention so that the technical solution of the present invention is easier to understand and grasp, but should not be understood as a limitation to the present invention.

[0019] Example:

[0020] A bearing sealing device for a rotating blade 13 of a plastic granulator, reference Figure 1 As shown, it includes an extrusion ring 1, a cooling plate 2, a sealing sleeve 3, a sealing plate 4, a bearing mounting seat 5, a cutter head bearing 6, a cutter head gear 7, and a rotating cutter head 8. In order to realize the function of the cutter head bearing 6, the cutter head gear 7 rotates circumferentially relative to the bearing mounting seat 5 through the cutter head bearing 6, and can drive the rotating cutter head 8 fixed on the cutter head gear 7 to rotate.

[0021] Specifically, the extrusion ring 1 is sleeved and fixed on the cooling disc 2, the sealing sleeve 3 is embedded and fixed in the cooling disc 2, the bearing mounting seat 5 is located outside the cooling disc 2 and sleeved with the cutter disc bearing 6, and the cutter disc bearing 6 is sleeved and fixed with the cutter disc gear 7. A gasket 9 is provided between the rotating cutter disc 8 and the cutter disc gear 7 to reserve a height for the sealing plate 4 to be placed. The rotating cutter disc 8 is fixed above the cutter disc gear 7 by bolts 10. The sealing plate 4 is fixed on the bearing mounting seat 5 and covers the cutter disc bearing 6. The design of the gasket 9 can adjust the height of the rotating cutter disc 8, so as to realize the size adjustment of the dust channel.

[0022] In order to fully play the role of the cutter head bearing 6, installation space and gap must be reserved in assembly and design, and this gap cannot be avoided. Figure 1 and Figure 2 As shown, the gap at D is the path for the dust plastic.

[0023] The cutter disc gear 7 is provided with a shielding portion 71, which is located above the cutter disc bearing 6, and the sealing plate 4 is stacked above the shielding portion 71. The shielding portion 71 further protects the cutter disc bearing 6, so that the cutter disc bearing 6 is not polluted during the movement of dust.

[0024] refer to Figure 3 As shown, an annular hollow groove 21 is provided at the bottom of the cooling plate 2, and the sealing sleeve 3 closes the opening 22 of the hollow groove 21. The hollow groove 21 of the cooling plate 2 can be filled with cooling water and cooling air, thereby playing a role in cooling.

[0025] The inner wall of the sealing sleeve 3 is provided with a material withdrawal thread 23, and the thread direction of the material withdrawal thread 23 is opposite to the rotation direction of the spiral feed shaft. Figure 3 and Figure 4 As shown, when the screw feed shaft rotates, when fine particles enter along the gap between the screw feed shaft and the sealing sleeve 3, they will be blocked back by the left-hand thread.

[0026] A plurality of sealing rings 11 are arranged on the contact surface between the cooling plate 2 and the sealing sleeve 3 . The sealing rings 11 are respectively located on both sides of the opening 22 of the empty groove 21 and the upper end of the sealing sleeve 3 .

[0027] The root of the sealing sleeve 3 is tightly fitted in the position of the empty groove 21 through the bolt 10. Under the action of the bolt 10, the root plane of the sealing sleeve 3 presses the sealing ring 11, so that the cooling water in the cooling plate 2 cannot overflow. This sealing sleeve 3 has a double sealing function. The root of the sealing sleeve 3 is provided with an inlet port 24 and an outlet port 25. This facilitates water filling or circulation of coolant.

[0028] According to the above structure, the device solves this problem by utilizing the blocking of tiny particles by the sealing plate 4 and the centrifugal force generated by the cutter disc gear 7. Figure 4 As shown, a blade 13 is provided on the rotating cutter disc 8, and the cutter disc is used to cut the plastic around the extrusion ring 1 for granulation, where a lot of tiny plastic particles or powder will be generated. The tiny plastic particles enter along the gap D between the extrusion ring 1 and the rotating cutter disc 8, and cannot directly enter the cutter disc bearing 6 due to the obstruction of the sealing plate 4. Instead, they continue to move along the gap between the sealing plate 4 and the rotating cutter disc 8 to the position shown in FIG. Figure 1 The arrow path shown in the figure lands on the plane of the cutter disc gear 7. Since the cutter disc gear 7 rotates at a high speed to generate centrifugal force, the tiny particles are thrown out of the body from the gap around the gasket 9.

[0029] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A plastic granulator rotary blade bearing sealing device, characterized in that: It includes an extrusion ring, a cooling plate, a sealing sleeve, a sealing plate, a bearing mounting seat, a cutter head bearing, a cutter head gear, and a rotating cutter head; The extrusion ring is sleeved and fixed on the cooling disk, the sealing sleeve is embedded and fixed in the cooling disk, the bearing mounting seat is located at the outside of the cooling disk and sleeved on the cutter disc bearing, the cutter disc bearing outer shell is sleeved and fixed on the cutter disc gear, a gasket is provided between the rotating cutter disc and the cutter disc gear to reserve a height for the sealing plate to be placed, the rotating cutter disc is fixed above the cutter disc gear by bolts, the sealing plate is fixed on the bearing mounting seat and covers the cutter disc bearing; a shielding portion is provided on the cutter disc gear, the shielding portion is above the cutter disc bearing, and the sealing plate is stacked above the shielding portion; an annular groove is provided at the bottom of the cooling disk, and the sealing sleeve closes the opening of the groove.

2. The bearing sealing device for the rotating blade of the plastic granulator according to claim 1, characterized in that: The inner wall of the sealing sleeve is provided with a material withdrawal thread, and the thread direction of the material withdrawal thread is opposite to the rotation direction of the spiral feeding shaft.

3. The bearing sealing device for the rotating blade of a plastic granulator according to claim 1, characterized in that: A plurality of sealing rings are arranged on the contact surface between the cooling plate and the sealing sleeve, and the sealing rings are respectively located at both sides of the opening of the empty groove and at the upper end of the sealing sleeve.

4. The bearing sealing device for the rotating blade of a plastic granulator according to claim 1, characterized in that: The root of the sealing sleeve is tightly fitted in the empty groove position through bolts.

5. The bearing sealing device for the rotating blade of the plastic granulator according to claim 4, characterized in that: The root of the sealing sleeve is provided with an inlet interface and an outlet interface.

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