Sealing device for feeding end face of ball mill
By designing a combined structure of ring plate, sealing ring, sealing gasket and spring at the feed end of the ball mill, the problem of easy damage of traditional sealing structure is solved, achieving high-efficiency sealing effect and low-cost maintenance, and improving production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-02
- Publication Date
- 2026-04-07
AI Technical Summary
The sealing structure at the feed end of traditional ball mills has poor wear resistance and is easily damaged, leading to serious material leakage and frequent maintenance, which affects production efficiency and cost.
Design a sealing device comprising a ring plate, a sealing ring, a sealing gasket, and a spring. The spring's preload adapts to dynamic deformation, and combined with a trapezoidal sealing ring and a composite wear-resistant rubber sealing gasket, forms a self-tightening seal, enhancing wear resistance and impact resistance. The movement of the sealing gasket is restricted by a split pressure plate and guide ring structure.
It improves the wear resistance and impact resistance of the seal, extends its service life, reduces maintenance costs and downtime, and reduces dust pollution.
Smart Images
Figure CN224093830U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to ball mill feeding technical field, concretely relates to a ball mill feeding end face sealing device. BACKGROUND
[0002] Ball mill is the key equipment that material is broken and is carried out the key equipment of crushing. The grinding operation is the important link in cement production, whether it is raw material or cement all need to pass the grinding to obtain, if fuel is coal, also need to be ground into coal powder to enter kiln combustion. The grinding technology will directly influence the quality and technical economic index of cement production.
[0003] The traditional ball mill feeding end generally adopts the coarse felt sealing structure, its material quality is poor, is easy to break after long -term impact and friction of material, lead to sealing failure, serious material leakage, not only cause dust pollution and raw material waste, also need to stop the machine to dismount the feeding device because of frequent replacement of felt, the maintenance cycle is long and the cost is high. In addition, the traditional sealing cannot adapt to the dynamic deformation when the ball mill rotates, the gap between the sealing surfaces is increased, which further aggravates the material leakage problem, and the sealing assembly lacks rigid support and is easy to displace due to vibration or impact, resulting in reduced sealing reliability. UTILITY MODEL CONTENTS
[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art, and provide a ball mill feeding end face sealing device to solve the problems in the background.
[0005] To achieve the above object, the utility model provides the following technical scheme: a ball mill feeding end face sealing device, including ring plate, the ring plate is welded and fixed on the end face outer edge of feeding spiral cylinder, and the inner side forms continuous annular sealing support surface, the outer circumferential surface of feeding spiral cylinder is equipped with sealing ring, the sealing ring and the sealing support surface of ring plate keep coaxial, the outer side of sealing ring is provided with sealing pad, the outer diameter of sealing pad and the inner diameter of ring plate gap cooperation, form radial sealing surface, the spring is evenly distributed and is provided along the circumference of ring plate, one end of spring abuts at the back of sealing pad, the other end is fixed in the recess in the inner side of ring plate, sealing pad and sealing ring are pressed by pre-tightening force, the end face of feeding spiral cylinder is provided with pressing plate through bolt fixation, and the outer side of sealing ring, sealing pad and spring is covered by pressing plate, and its axial displacement is limited.
[0006] Preferably, the ring plate sealing support surface is perpendicular to the end face of the feeding spiral cylinder, and a continuous weld is arranged at the welding position of the ring plate, and a ring-shaped recess is arranged on the inner side of the ring plate for accommodating the end portion of the spring.
[0007] Preferably, the cross section of the sealing ring is a trapezoidal structure, the inclined surface of the sealing ring is matched with the corresponding inclined surface of the sealing pad to form a self-tightening sealing structure, and the inner wall of the sealing ring is provided with anti-skid protrusions which are in interference fit with the outer circumferential surface of the feeding pipe.
[0008] Preferably, the material of the sealing gasket is a composite wear-resistant rubber, the outer surface of which is coated with a polytetrafluoroethylene layer, and the contact surface of the sealing gasket and the ring plate is provided with a wavy groove.
[0009] Preferably, the spring is a plurality of helical compression springs, each of which is uniformly distributed along the circumference of the ring plate, and the pre-tightening force of the spring is dynamically adjusted by an adjusting bolt, the adjusting bolt penetrating through the ring plate and being connected with the fixed end of the spring.
[0010] Preferably, the pressing plate is a split ring structure formed by splicing at least two arc-shaped plates by bolts, and a guide boss is arranged on the inner edge of the pressing plate and embedded in the outer groove of the sealing gasket to prevent the circumferential deviation of the sealing gasket.
[0011] Preferably, a guide ring is further arranged between the ring plate and the sealing gasket, the guide ring is fixed to the inner side of the ring plate, an axial guide groove is arranged on the surface of the guide ring, and a matching guide protrusion is arranged on the back surface of the sealing gasket to limit the movement of the sealing gasket in the axial direction only.
[0012] Compared with the prior art, the ball mill feed end face sealing device has the following beneficial effects:
[0013] 1. The spring uniformly presses the sealing ring and the sealing gasket, the elastic pre-tightening force is self-adaptively and dynamically deformed, the sealing surface is always tightly adhered, the wear resistance and impact resistance are improved by combining the design of the trapezoidal cross-section sealing ring and the composite wear-resistant rubber sealing gasket, and the service life is prolonged.
[0014] 2. The sealing assembly is fixed as a detachable module group by the pressing plate, cooperates with the split pressing plate and the positioning pin design, can be quickly replaced without disassembling the feed spiral cylinder, significantly reduces the maintenance cost and downtime, the ring plate is welded to the end face of the feed spiral cylinder to form a continuous sealing support surface, the sealing gasket is limited to move in the axial direction only by combining the guide ring and the guide groove structure, circumferential deviation is avoided, and stability is enhanced; the dust cover and the labyrinth sealing structure are additionally arranged, external dust is effectively blocked, and the wear risk is further reduced. BRIEF DESCRIPTION OF DRAWINGS
[0015] The accompanying drawings are used to provide a further understanding of the present application, constitute a part of the specification, are used to explain the present application together with embodiments of the present application, and do not constitute a limitation to the present application, and in the drawings:
[0016] Fig. 1 The accompanying drawings are used to provide a further understanding of the present application, constitute a part of the specification, are used to explain the present application together with embodiments of the present application, and do not constitute a limitation to the present application, and in the drawings:
[0017] Fig. 2 The accompanying drawings are used to provide a further understanding of the present application, constitute a part of the specification, are used to explain the present application together with embodiments of the present application, and do not constitute a limitation to the present application, and in the drawings:
[0018] Fig. 3 This is a schematic diagram of the sealing ring structure proposed in this utility model;
[0019] In the diagram: 1. Sealing ring; 2. Sealing gasket; 3. Spring; 4. Ring plate; 5. Pressure plate. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Please see Figs. 1-3 This utility model provides a technical solution: a ball mill feed end face sealing device, including an annular plate 4, which is welded and fixed to the outer edge of the end face of the feed screw cylinder, and forms a continuous annular sealing support surface on its inner side. A sealing ring 1 is sleeved on the outer circumferential surface of the feed screw cylinder. The sealing ring 1 and the sealing support surface of the annular plate 4 are coaxial. A sealing gasket 2 is attached to the outer side of the sealing ring 1. The outer diameter of the sealing gasket 2 is clearance-fitted with the inner diameter of the annular plate 4 to form a radial sealing surface. Springs 3 are evenly distributed along the circumference of the annular plate 4. One end of the spring 3 abuts against the back of the sealing gasket 2, and the other end is fixed in the inner groove of the annular plate 4. The sealing gasket 2 and the sealing ring 1 are pressed together by a pre-tightening force. A pressure plate 5 is fixed to the end face of the feed screw cylinder by bolts, and the pressure plate 5 covers the outer side of the sealing ring 1, the sealing gasket 2 and the spring 3 to restrict their axial displacement.
[0022] In this utility model, preferably, the sealing support surface of the ring plate 4 is welded perpendicularly to the end face of the feed screw cylinder, and the weld joint has a continuous weld. An annular groove is formed on the inner side of the ring plate 4 to accommodate the end of the spring 3. The sealing ring 1 has a trapezoidal cross-section, and its inclined surface fits against the corresponding inclined surface of the sealing gasket 2 to form a self-tightening seal. The inner wall of the sealing ring 1 has anti-slip protrusions that are interference-fitted with the outer circumferential surface of the feed pipe. The sealing gasket 2 is made of composite wear-resistant rubber, and its outer surface is coated with a polytetrafluoroethylene layer. The contact surface between the sealing gasket 2 and the ring plate 4 has a wavy groove. The spring 3 is a multi-set helical compression spring. The springs 3 are evenly distributed at 30° intervals around the ring plate 4, and the preload of the springs 3 is dynamically adjusted by adjusting bolts. The adjusting bolts pass through the ring plate 4 and are connected to the fixed end of the springs 3. The pressure plate 5 is a split ring structure, which is made up of at least two arc-shaped plates spliced together by bolts. Its inner edge is provided with a guide boss, which fits into the outer groove of the sealing gasket 2 to prevent the sealing gasket 2 from shifting circumferentially. A guide ring is also provided between the ring plate 4 and the sealing gasket 2. The guide ring is fixed to the inner side of the ring plate 4 and has an axial guide groove on its surface. The back of the sealing gasket 2 is provided with a matching guide protrusion to restrict the sealing gasket 2 to move only along the axial direction.
[0023] The working principle and usage process of this utility model are as follows: First, the ring plate 4 is welded and fixed to the outer edge of the feed screw cylinder end face, ensuring a continuous annular sealing support surface is formed on its inner side. Next, the sealing ring 1 is fitted onto the outer circumferential surface of the feed pipe, and an interference fit is made with the feed pipe through the anti-slip protrusions on the inner wall. Then, the sealing gasket 2 is attached to the outer side of the sealing ring 1, with its outer diameter clearance fitting with the inner diameter of the ring plate 4 to form a radial sealing surface. Multiple sets of spiral compression springs 3 are evenly distributed along the circumference of the ring plate 4, with one end of the spring 3 abutting against the back of the sealing gasket 2 and the other end fixed... The spring 3 is preloaded by adjusting the bolts in the groove inside the ring plate 4. Finally, the split pressure plate 5 is fixed to the end face of the feed screw drum by bolt splicing. The guide boss on the inner edge of the pressure plate 5 is embedded in the groove on the outer side of the sealing gasket 2, which restricts its circumferential displacement and covers the outer side of the sealing ring 1, the sealing gasket 2 and the spring 3. When the equipment is running, the elastic clamping force of the spring 3 adapts to the dynamic deformation to ensure that the sealing surface fits tightly. During regular maintenance, the module group consisting of the sealing ring 1, the sealing gasket 2 and the spring 3 can be quickly replaced by disassembling the pressure plate 5 without disassembling the feed screw drum.
[0024] 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 ball mill feed end face sealing device, comprising a ring plate (4), characterized in that, The ring plate (4) is welded and fixed to the outer edge of the end face of the feed screw cylinder, and a continuous annular sealing support surface is formed on the inner side. A sealing ring (1) is sleeved on the outer circumferential surface of the feed screw cylinder. The sealing ring (1) and the sealing support surface of the ring plate (4) are coaxial. A sealing gasket (2) is attached to the outer side of the sealing ring (1). The outer diameter of the sealing gasket (2) is clearance-fitted with the inner diameter of the ring plate (4) to form a radial sealing surface. Springs (3) are evenly distributed along the circumference of the ring plate (4). One end of the spring (3) abuts against the back of the sealing gasket (2), and the other end is fixed in the inner groove of the ring plate (4). The sealing gasket (2) and the sealing ring (1) are pressed together by pre-tightening force. A pressure plate (5) is fixed to the end face of the feed screw cylinder by bolts. The pressure plate (5) covers the outer side of the sealing ring (1), the sealing gasket (2) and the spring (3) to restrict their axial displacement.
2. The ball mill feed end face sealing device according to claim 1, characterized in that: The sealing support surface of the ring plate (4) is welded perpendicularly to the end face of the feed screw cylinder, and a continuous weld is provided at the weld. An annular groove is opened on the inner side of the ring plate (4) to accommodate the end of the spring (3).
3. The ball mill feed end face sealing device according to claim 1, characterized in that: The sealing ring (1) has a trapezoidal cross section, and its inclined surface fits against the corresponding inclined surface of the sealing gasket (2) to form a self-tightening seal; the inner wall of the sealing ring (1) is provided with anti-slip protrusions, which are interference fit with the outer circumferential surface of the feed pipe.
4. The ball mill feed end face sealing device according to claim 1, characterized in that: The sealing gasket (2) is made of composite wear-resistant rubber, and its outer surface is coated with a polytetrafluoroethylene layer. The contact surface between the sealing gasket (2) and the ring plate (4) is provided with a wavy groove.
5. The ball mill feed end face sealing device according to claim 1, characterized in that: The spring (3) is a set of multiple helical compression springs. Each set of springs (3) is evenly distributed at 30° intervals along the circumference of the ring plate (4). The preload of the spring (3) is dynamically adjusted by adjusting bolts. The adjusting bolts pass through the ring plate (4) and are connected to the fixed end of the spring (3).
6. The ball mill feed end face sealing device according to claim 1, characterized in that: The pressure plate (5) is a split ring structure, which is made of at least two arc plates spliced together by bolts. Its inner edge is provided with a guide boss, which fits into the outer groove of the sealing gasket (2) to prevent the sealing gasket (2) from shifting circumferentially.
7. The ball mill feed end face sealing device according to claim 1, characterized in that: A guide ring is also provided between the ring plate (4) and the sealing gasket (2). The guide ring is fixed to the inner side of the ring plate (4), and an axial guide groove is opened on its surface. The back of the sealing gasket (2) is provided with a matching guide protrusion, which restricts the sealing gasket (2) to move only along the axial direction.