A kind of weightlessness scale horizontal stirring seal structure

Abstract

The utility model discloses a kind of weightlessness scale horizontal mixing sealing structures, including ball hopper, the lateral wall of ball hopper is equipped with the sealing part for horizontal mixing shaft rotation connection, sealing part includes base body, connecting seat, connecting seat is installed on base body, through both formation axial hole for mixing shaft to pass through, oil seal body is equipped in sealing chamber, strengthen sealing structure, strengthen sealing structure includes shaft sleeve, shaft sleeve is sleeved on horizontal mixing shaft. By setting shaft sleeve, it is sleeved on horizontal mixing shaft, the axial hole end on ball hopper is directly sealed, avoid powder directly contact oil seal body, prolong the sealing effect and maintenance cycle of oil seal. Labyrinth sealing structure and tetrafluoro sleeve work cooperatively, labyrinth sealing structure includes static ring cover and dynamic ring cover, the sealing teeth of two are staggered arrangement, powder motion path is lengthened in labyrinth passage, and difficulty of leakage increases;Tetrafluoro sleeve further blocks a small amount of powder that penetrates through labyrinth sealing structure, oil seal as last line of defense, form multiple seals.

Description

Technical Field

[0001] This utility model relates to the field of loss-in-weight scale technology, specifically to a horizontal stirring and sealing structure for a loss-in-weight scale. Background Technology

[0002] In industrial production processes, loss-in-weight balances, as key equipment for accurately measuring material mass, are widely used in many fields such as chemical, food, and building materials. Among these, the horizontal stirring and sealing structure of the loss-in-weight balance plays a decisive role in the overall performance of the equipment and the accuracy of material measurement. Currently, this field mainly adopts two structural forms: direct oil seal and gas seal.

[0003] Direct oil seals involve installing one or two oil seals on a horizontal agitator shaft. During horizontal agitation, contact between the material and the oil seal is unavoidable. When handling larger particles like granules, the oil seals effectively prevent leakage and ensure normal production. However, problems arise when dealing with fine powdery materials. During prolonged agitation, the small particle size allows the powder to gradually penetrate the sealing lip of the oil seal. Over time, this penetration intensifies, eventually severely damaging the seal's performance and causing it to fail. This not only leads to material leakage, causing discrepancies between actual material usage and measured values, affecting product quality and production efficiency, but also potentially causes environmental pollution, equipment corrosion, and other problems, increasing production and maintenance costs for the company.

[0004] Gas seals, also known as gas seals, work by introducing a slightly positive pressure gas into a horizontal stirring shaft. The gas pressure prevents material leakage, especially of powdered materials, thus achieving a seal. This sealing method exhibits good sealing performance when dealing with powdered materials, effectively preventing leakage. However, this structure has significant drawbacks. Its design is relatively complex, requiring a dedicated positive pressure gas supply system in practical applications. This not only significantly increases the equipment's purchase cost but also makes installation and commissioning more cumbersome, demanding higher levels of expertise from operators. Furthermore, subsequent equipment maintenance costs are significantly increased, including regular inspections and maintenance of the gas supply system, as well as gas consumption expenses, which to some extent limits its widespread application in cost-sensitive enterprises.

[0005] The two existing horizontal stirring sealing structures for loss-in-weight scales have revealed significant limitations in practical applications. With the increasing sophistication of industrial production, the sealing requirements for different types of materials (granules and powders) are becoming increasingly stringent. These requirements not only demand that the sealing structure ensure efficient and stable sealing performance, but also expect improvements in equipment reliability and durability while reducing costs and simplifying the structure. Therefore, developing an innovative horizontal stirring sealing structure for loss-in-weight scales has become a critical issue urgently needing to be addressed in the industry, and it has significant practical implications for promoting the high-quality development of related industries. Utility Model Content

[0006] The purpose of this invention is to overcome the defects in the existing technology and provide a horizontal stirring and sealing structure for a loss-in-weight scale.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows: A horizontal stirring and sealing structure for a loss-in-weight scale includes a ball hopper and a horizontal stirring mechanism disposed through the side wall of the ball hopper. The side wall of the ball hopper is provided with a sealing part for rotatably connecting to the horizontal stirring shaft. The sealing part includes a base body and a connecting seat. The connecting seat is mounted on the base body and forms an axial hole through the two for the stirring shaft to pass through. The connecting seat has a sealing chamber inside. The sealing chamber contains an oil seal body and a reinforcing sealing structure. The reinforcing sealing structure includes a bushing of a certain length, which is sleeved on the horizontal stirring shaft.

[0008] Furthermore, the bushing is made of PTFE material and is installed in the sealed cavity with an interference fit, so that the horizontal stirring shaft and the PTFE bushing are rotatably connected.

[0009] Furthermore, the enhanced sealing structure also includes a labyrinth sealing structure, which comprises a stationary ring sleeve and a moving ring sleeve. The stationary ring sleeve is fixedly disposed within the connecting seat, and the moving ring sleeve is disposed on the horizontal stirring shaft and rotates with the shaft. The moving ring sleeve is coaxially disposed inside the stationary ring sleeve. A plurality of annular stationary ring teeth are formed on the inner wall of the stationary ring sleeve, and a plurality of annular moving ring teeth are formed on the outer wall of the moving ring sleeve. The moving ring teeth and the stationary ring teeth are arranged alternately.

[0010] Furthermore, the moving ring tooth includes a vertical portion and a bent portion. The vertical portion is perpendicularly connected to the axis of the moving ring sleeve. The bent portion is formed by extending obliquely from the outer edge of the vertical portion toward one side of the stationary ring tooth. According to the oblique direction of the bent portion, it is divided into a type I tooth ring and a type II tooth ring. The type I tooth ring is obliquely oriented toward the powder receiving side, and the type II tooth ring is obliquely oriented in the opposite direction to the type I tooth ring.

[0011] Furthermore, the small included angle formed between the bent portion and the vertical portion on the moving gear ring is between 30° and 70°.

[0012] Furthermore, the distance between the bent portion of the moving toothed ring and the adjacent stationary toothed ring is D, and the distance between the moving toothed ring and the adjacent stationary toothed ring on the other side is also D.

[0013] Furthermore, the distance of D is controlled within 0.2-0.5 mm.

[0014] Furthermore, the connecting seat has a side wall discharge hole on the side wall where the labyrinth sealing structure is set, so that the side wall discharge hole is connected to the gap between the stationary ring teeth on the stationary ring sleeve.

[0015] Furthermore, the oil seal body has at least two in the sealing chamber, and is located at the axial holes at both ends respectively. The sealing chamber is also provided with a support bearing.

[0016] The advantages and beneficial effects of this utility model are as follows: 1. By setting a bushing, which is fitted onto the horizontal stirring shaft, the axial hole end on the ball hopper is directly sealed, preventing the powder from directly contacting the oil seal body, thus extending the sealing effect of the oil seal and the maintenance cycle.

[0017] 2. The labyrinth seal structure works in conjunction with the PTFE sleeve. The labyrinth seal structure includes a stationary ring sleeve and a moving ring sleeve. The sealing teeth of the two are arranged in an alternating pattern, which extends the movement path of powder in the labyrinth channel and increases the difficulty of leakage. The PTFE sleeve further blocks a small amount of powder that can pass through the labyrinth seal structure. The oil seal serves as the last line of defense, forming a multi-layered seal.

[0018] 3. The moving ring tooth includes a vertical part and a bent part. The bent part is inclined towards the powder feeding side or the counterflow direction. The angle between the bent part and the vertical part is between 30° and 70°, which can guide the powder flow. The distance between the moving tooth ring and the adjacent stationary tooth ring is controlled at 0.2-0.5mm to prevent a large amount of powder leakage and avoid excessive friction.

[0019] 4. The connecting seat is provided with a discharge hole on the side wall of the labyrinth seal structure, so that the discharge hole is connected with the gap between the teeth of the stationary ring sleeve, thus preventing powder from filling the labyrinth seal structure. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the horizontal stirring and sealing structure of a loss-in-weight scale according to this utility model; Figure 2 This is an exploded view of a horizontal stirring and sealing structure for a loss-of-weight scale according to this utility model; Figure 3 This utility model Figure 1 One of the magnified views of a section; Figure 4 This utility model Figure 1 The second enlarged view of a section; In the diagram: 1. Ball hopper; 2. Horizontal stirring mechanism; 3. Sealing part; 4. Base body; 5. Connecting seat; 6. Axial hole; 7. Sealing chamber; 8. Oil seal body; 9. Bushing; 10. Horizontal stirring shaft; 11. PTFE sleeve; 12. Labyrinth seal structure; 13. Stationary ring sleeve; 14. Moving ring sleeve; 15. Stationary ring tooth; 16. Moving ring tooth; 17. Vertical part; 18. Bend part; 19. Type I toothed ring; 20. Type II toothed ring; 21. Side wall discharge hole; 22. Support bearing; 23. Sealing ring. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0022] A horizontal stirring and sealing structure for a loss-in-weight scale, such as Figure 1-4 As shown, the device includes a spherical hopper 1 and a horizontal stirring mechanism 2 installed through the side wall of the spherical hopper 1. The bottom of the silo is a spherical hopper, i.e., the spherical hopper 1. When weighing powder, to prevent bridging of powder within the silo and thus ensure smooth discharge, the device is equipped with a horizontal stirring mechanism 2 to enhance the stirring of the internal powder and prevent bridging that could cause discharge obstruction. Because the horizontal stirring mechanism 2 is installed... Figure 1 As shown, its horizontal stirring shaft 10 passes through the side wall of the ball hopper 1 and is connected to the external drive motor. Therefore, the powder inside the hopper can easily overflow from the horizontal stirring shaft 10 to the outside.

[0023] In this embodiment, a sealing part 3 is provided on the side wall of the ball hopper 1 for rotatably connecting to the horizontal stirring shaft 10. The sealing part 3 includes an oil seal component commonly used in the prior art for sealing. However, during long-term use, milled powder particles can penetrate into the sealing lip, leading to a deterioration in the sealing effect. Specifically, for example... Figure 2 , 3 As shown, the sealing part 3 includes a base body 4 and a connecting seat 5. The connecting seat 5 is mounted on the base body 4, and an axial hole 6 is formed through both to allow the stirring shaft to pass through. The connecting seat 5 has a sealing chamber 7 inside. The base body 4 is fixedly set on the outer wall of the ball bucket 1, and the connecting seat 5 is mounted on it. The connecting seat 5 has a cylindrical inner cavity, with one end open and the other end having an axial hole 6 formed on the inner bottom surface. When the connecting seat 5 is mounted on the base body 4, the opening is closed to form the sealing chamber 7. Furthermore, an oil seal body 8 and a reinforcing sealing structure are provided in the sealing chamber 7. In this embodiment, a reinforcing sealing structure is added in the sealing chamber 7 to enhance the sealing of the powder.

[0024] Specifically, the reinforced sealing structure includes a bushing 9 of a certain length, which is fitted onto the horizontal stirring shaft 10. For example... Figure 3As shown, in this embodiment, an oil seal body 8 is provided in the axial hole 6 at the inner bottom of the connecting seat 5, and a bushing 9 is provided on the side near the ball bucket 1. The length of the bushing 9 is not less than the diameter of the horizontal stirring shaft 10. The bushing 9 directly seals the end of the axial hole 6 on the ball bucket 1, thereby preventing the powder from directly contacting the oil seal body 8. It can be understood that after the powder passes through the narrow bushing 9, most of the powder will be blocked at the axial hole 6 on the side of the ball bucket 1, and no powder or a small amount of powder will reach the oil seal body 8. Therefore, the oil seal body 8 can maintain a good sealing effect for a long time, which can greatly extend the maintenance cycle. Furthermore, the bushing 9 is made of PTFE material and is fitted with an interference fit within the sealed chamber 7, allowing for a rotatable connection between the horizontal stirring shaft 10 and the PTFE bushing 11. In this embodiment, the PTFE bushing 11 is used as the bushing 9. The outer ring of the PTFE bushing 11 is fitted with an interference fit within the sealed chamber 7 to fix its position, while the inner ring maintains a small gap with the horizontal stirring shaft 10 to allow the horizontal stirring shaft 10 to rotate freely.

[0025] As another improved implementation, this embodiment does not limit the position of the PTFE sleeve 11 to be fixed. That is, the PTFE sleeve 11 can be dynamically arranged in the sealed chamber 7 with free rotation. That is, the inner wall and outer wall of the PTFE sleeve 11 maintain a small gap with the horizontal stirring shaft 10 and the inner wall of the sealed chamber 7. Whether it rotates freely in the sealed chamber 7 or not, it can achieve the function of filling the gap and blocking the passage of powder.

[0026] In another embodiment, the reinforced sealing structure further includes a labyrinth sealing structure 12, such as... Figure 4 As shown, the labyrinth sealing structure 12 includes a stationary ring sleeve 13 and a moving ring sleeve 14. The stationary ring sleeve 13 is fixedly installed inside the connecting seat 5, and the moving ring sleeve 14 is installed on the horizontal stirring shaft 10 and rotates with the shaft. The moving ring sleeve 14 is coaxially installed inside the stationary ring sleeve 13. Several annular stationary ring teeth 15 are formed on the inner wall of the stationary ring sleeve 13, and several annular moving ring teeth 16 are formed on the outer wall of the moving ring sleeve 14. The moving ring teeth 16 and stationary ring teeth 15 are arranged alternately. Comb-shaped stationary ring teeth 15 and moving ring teeth 16 are formed at intervals on both the stationary ring sleeve 13 and the moving ring sleeve 14. When the powder attempts to leak through the gap between the stationary ring sleeve 13 and the moving ring sleeve 14, it will continuously hit the walls and deflect within the labyrinth channel, increasing the resistance to powder leakage. Because the movement path of the powder particles within the labyrinth channel is greatly extended, the difficulty of leakage is significantly increased, thereby further improving the sealing effect on the powder.

[0027] The sealing teeth within the labyrinth sealing structure 12 can be made of polyetheretherketone (PEEK). This material has excellent wear resistance, capable of withstanding long-term friction with materials; strong chemical stability, not easily reacting with various materials; and good high-temperature resistance, maintaining stable performance even in the high-temperature environment that may arise during the operation of the loss-in-weight scale, ensuring the normal use of the sealing teeth.

[0028] The labyrinth sealing structure 12 works in conjunction with the PTFE sleeve 11: For example... Figure 4 As shown, this embodiment takes the setting of an oil seal body 8 as an example. Specifically, a PTFE sleeve 11 is set between the labyrinth sealing structure and the oil seal body 8, and the oil seal body 8 is located at the axial hole 6 at the bottom of the connecting seat 5. The labyrinth sealing structure first blocks the material, reducing the amount of material entering the area of ​​the PTFE sleeve 11; then the PTFE sleeve 11 further blocks a small amount of powder that passes through the labyrinth sealing structure; finally, the oil seal acts as the last line of defense to ensure that the material does not leak. The three work together to form a multi-layered sealing guarantee. Alternatively, a support bearing 22 can be added internally to improve rotational stability.

[0029] Furthermore, the moving ring tooth 16 includes a vertical portion 17 and a bent portion 18, such as... Figure 4 As shown, the vertical part 17 is perpendicularly connected to the axis of the moving ring sleeve 14. The bent part 18 extends obliquely from the outer edge of the vertical part 17 towards one side of the stationary ring tooth 15. Based on the oblique direction of the bent part 18, it is divided into a type I toothed ring 19 and a type II toothed ring 20. The type I toothed ring 19 is obliquely oriented towards the material feeding side of the powder, while the type II toothed ring 20 is obliquely oriented in the opposite direction to the type I toothed ring 19. By reasonably adjusting the shape and angle of the labyrinth sealing teeth, and designing the sealing teeth with a certain oblique angle, the powder, after entering the labyrinth seal, can slide along the oblique sealing tooth surface towards the material side under the centrifugal force generated by the rotation of the stirring shaft and its own gravity, instead of accumulating inside the labyrinth seal. At the same time, appropriately increasing the spacing between the labyrinth sealing teeth can ensure the sealing effect while reducing the possibility of powder accumulation in the confined space and lowering the rotational resistance of the stirring shaft.

[0030] The moving ring tooth 16 includes a vertical portion 17 and a bent portion 18. The vertical portion 17 is vertically connected to the outer wall of the moving ring, providing a stable support structure for the moving ring tooth 16. The bent portion 18 extends from the outer edge of the vertical portion 17 toward the stationary ring side, while simultaneously tilting in the direction of incoming or counter-flow. Taking a toothed ring 19 tilted toward the powder-feeding side as an example, the included angle between its bent portion 18 and vertical portion 17 is set between 30° and 70°. This angle is optimized to effectively guide the powder flow while ensuring sealing performance. Furthermore, the distance between the bent portion 18 of the moving toothed ring and the adjacent stationary toothed ring is D, and the distance between the moving toothed ring and the adjacent stationary toothed ring on the other side is also D. The distance D is controlled between 0.2 and 0.5 mm. This spacing setting can prevent excessive powder leakage and avoid excessive friction caused by too small a distance, further enhancing the sealing effect.

[0031] One arrangement involves setting 3-5 layers of sealing teeth between the stirring shaft and the connecting seat 5, with adjacent layers of sealing teeth staggered. For example, the tip of the first layer of sealing teeth faces the root of the second layer, and so on. This staggered arrangement greatly extends the leakage path of the material. When the material attempts to leak through the gap, it needs to go through multiple turns and obstructions, effectively enhancing the sealing effect.

[0032] Furthermore, the connecting seat 5 has a side wall discharge hole 21 on the side wall where the labyrinth sealing structure 12 is located, so that the side wall discharge hole 21 is connected to the gap between the stationary ring teeth 15 on the stationary ring sleeve 13. Figure 4 As shown, a side wall discharge hole 21 is provided at the lower part of the connecting seat 5. If powder enters the labyrinth sealing structure 12, the powder is blocked by the stationary ring tooth 15 and the moving ring tooth 16, causing it to move and accumulate slowly between the two. When the powder reaches the side wall discharge hole 21, it will fall automatically, thereby avoiding the powder from filling the labyrinth sealing structure 12.

[0033] In another embodiment, at least two oil seal bodies 8 are provided within the sealing chamber 7, respectively located at the axial holes 6 at both ends, and the sealing chamber 7 is also provided with a support bearing 22. Figure 4 As shown, this embodiment differs from the previous embodiment in that an oil seal body 8 is added at the front end of the labyrinth sealing structure 12, and a support bearing 22 is provided in the sealing chamber 7, thereby improving the support stability of the horizontal stirring shaft 10 rotation.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A horizontal stirring and sealing structure for a loss-in-weight scale, characterized in that, Includes a ball bucket (1), a horizontal stirring mechanism (2) provided through the side wall of the ball bucket (1), a sealing part (3) provided on the side wall of the ball bucket (1) for the horizontal stirring shaft (10) to rotate and connect, the sealing part (3) includes a base body (4) and a connecting seat (5), the connecting seat (5) is installed on the base body (4), and an axial hole (6) is formed through the two for the stirring shaft to pass through, the connecting seat (5) is provided with a sealing chamber (7), the sealing chamber (7) is provided with an oil seal body (8) and a reinforced sealing structure, the reinforced sealing structure includes a bushing (9) of a certain length, the bushing (9) is sleeved on the horizontal stirring shaft (10).

2. The horizontal stirring and sealing structure for a loss-in-weight scale according to claim 1, characterized in that, The bushing (9) is made of PTFE material and is a PTFE sleeve (11). The PTFE sleeve (11) is installed in the sealed chamber (7) with an interference fit, so that the horizontal stirring shaft (10) and the PTFE sleeve (11) are rotatably connected.

3. The horizontal stirring and sealing structure for a loss-in-weight scale according to claim 1, characterized in that, The enhanced sealing structure also includes a labyrinth sealing structure (12), which includes a stationary ring sleeve (13) and a moving ring sleeve (14). The stationary ring sleeve (13) is fixedly installed inside the connecting seat (5), and the moving ring sleeve (14) is installed on the horizontal stirring shaft (10) and rotates with the shaft. The moving ring sleeve (14) is coaxially installed inside the stationary ring sleeve (13). Several ring-shaped stationary ring teeth (15) are formed on the inner wall of the stationary ring sleeve (13), and several ring-shaped moving ring teeth (16) are formed on the outer wall of the moving ring sleeve (14). The moving ring teeth (16) and the stationary ring teeth (15) are arranged alternately.

4. The horizontal stirring and sealing structure of the loss-in-weight scale according to claim 3, characterized in that, The moving ring tooth (16) includes a vertical part (17) and a bent part (18). The vertical part (17) is perpendicularly connected to the axis of the moving ring sleeve (14). The bent part (18) is formed by extending obliquely from the outer edge of the vertical part (17) to one side of the stationary ring tooth (15). According to the oblique direction of the bent part (18), it is divided into a type 1 tooth ring (19) and a type 2 tooth ring (20). The type 1 tooth ring (19) is obliquely oriented towards the side of the powder material, and the type 2 tooth ring (20) is obliquely oriented in the opposite direction to the type 1 tooth ring (19).

5. The horizontal stirring and sealing structure of the loss-in-weight scale according to claim 4, characterized in that, The small included angle formed between the bent portion (18) and the vertical portion (17) on the moving ring tooth (16) is between 30° and 70°.

6. The horizontal stirring and sealing structure of the loss-in-weight scale according to claim 3, characterized in that, The distance between the bent portion (18) of the moving ring tooth (16) and the adjacent stationary tooth ring is D, and the distance between the moving tooth ring and the adjacent stationary tooth ring on the other side is also D.

7. The horizontal stirring and sealing structure for a loss-in-weight scale according to claim 6, characterized in that, The distance of D is controlled between 0.2 and 0.5 mm.

8. A horizontal stirring and sealing structure for a loss-in-weight scale according to any one of claims 3-7, characterized in that, The connecting seat (5) has a side wall discharge hole (21) on the side wall where the labyrinth sealing structure (12) is set, so that the gap between the side wall discharge hole (21) and the stationary ring teeth (15) on the stationary ring sleeve (13) is connected.

9. The horizontal stirring and sealing structure of the loss-in-weight scale according to claim 1, characterized in that, At least two oil seal bodies (8) are provided in the sealing chamber (7) and are located at the axial holes (6) at both ends respectively. The sealing chamber (7) is also provided with a support bearing (22).

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