Improved screw feeder seal bearing block

Abstract

The utility model discloses an improved spiral feeder sealing bearing seat, the front end in bearing seat is set with step shape big, medium, small caliber fit -hole from outside to inside in proper order, and the big caliber fit -hole is installed with the sealing sleeve that cooperates with the end axle of spiral conveying rod, and the medium caliber fit -hole is installed with the sealing ring, and the sealing ring cooperates with the connecting axle of end axle fixed connection, the inner hole wall of sealing sleeve and sealing ring is provided with the reverse spiral groove that cooperates with end axle and connecting axle respectively, and the reverse spiral groove is opposite with the rotating direction of end axle and connecting axle, and the outer end wall of sealing ring and the connecting axle that passes through small caliber fit -hole constitute oil chamber. The utility model discloses rational in structure, simple structure, high reliability, long -lived screw feeder bearing seat, through the combination scheme of multistage spiral sealing counter -thrust material + wear -resisting sliding bearing fault tolerance design, effectively blocks the invasion of powder, even if a small amount of leakage also does not affect the operation, thereby significantly improves equipment stability and service life, reduces operation and maintenance cost.

Description

Technical Field

[0001] This utility model relates to an improvement in the structure of a sealed bearing housing for a screw feeder, specifically an improved sealed bearing housing for a screw feeder. Background Technology

[0002] In industries such as chemical, pharmaceutical, food, and new materials, screw feeders are widely used for the quantitative and continuous conveying of powdery or granular materials. One of its core components is the bearing housing located at the end of the screw shaft, which prevents material from leaking axially into the bearing cavity.

[0003] In existing technologies, conventional bearing housings typically employ a single-pass lip seal (such as a skeleton oil seal) in conjunction with the rolling bearing structure. However, during long-term operation, the following prominent problems exist: The sealing ring is easily worn: the powder is abrasive, and the lip wears quickly under the friction of the rotating screw, losing its sealing effect; Material intrusion into the bearing: Once the seal fails, powder enters the bearing cavity, causing the rolling bearing to seize, corrode, or break. High maintenance costs: Frequent downtime for replacing seals and bearings affects production continuity and increases labor and spare parts costs; Low equipment uptime: Failures caused by seal failure are the main reason for unplanned downtime of screw feeders.

[0004] Although some improvements have been made, such as adding labyrinth seals and using ceramic coatings, the problem of "seal-bearing" synergistic failure has not been fundamentally solved, and the structure is complex and costly, making it difficult to promote. Utility Model Content

[0005] The purpose of this utility model is to provide an improved screw feeder sealing bearing housing, which has a reasonable and simple structure, high reliability and long service life. Through the combination of multi-stage spiral sealing to push materials back and wear-resistant sliding bearing fault-tolerant design, it effectively prevents powder intrusion. Even if there is a small amount of leakage, it will not affect the operation, thereby significantly improving the stability and service life of the equipment and reducing the operation and maintenance costs.

[0006] The purpose of this utility model is achieved as follows: An improved screw feeder sealing bearing seat includes a bearing seat disposed on the screw feeder housing. The bearing seat is fitted with the end shaft of the screw conveyor rod through a bearing and a sealing device. A stepped, large, medium, and small diameter mating holes are sequentially arranged from the outside to the inside within the bearing seat. A sealing sleeve that mates with the end shaft of the screw conveyor rod is installed in the large diameter mating hole, and a sealing ring is installed in the medium diameter mating hole. The sealing ring mates with a connecting shaft fixed to the end shaft. Reverse spiral grooves that mate with the end shaft and connecting shaft are respectively provided on the inner walls of the sealing sleeve and the sealing ring. The reverse spiral grooves rotate in the opposite direction to the rotation of the end shaft and connecting shaft. The outer end wall of the sealing ring and the connecting shaft passing through the small diameter mating hole form an oil chamber. The connecting shaft passing through the oil chamber mates with a sliding bearing installed in the rear bearing hole within the bearing seat.

[0007] The bearing housing of this utility model includes: a bearing housing body (fixed to the feeder housing); three coaxially arranged spiral sealing rings installed in the bearing housing body; and a wear-resistant sliding bearing located at the rear end of the bearing housing for supporting the rotation of the screw shaft.

[0008] (II) Key Technical Features Three-screw sealing ring design: Three sealing rings are arranged sequentially along the screw axis. The inner hole of each sealing ring is provided with a reverse spiral groove (i.e., reverse spiral) opposite to the screw rotation direction. When the screw rotates in the forward direction to transport materials, the powder that leaks into the sealing area is actively pushed back into the material cavity under the action of the reverse spiral, forming a "self-cleaning + reverse barrier" effect. The multi-level structure forms a gradient sealing barrier, which significantly improves the sealing reliability.

[0009] Wear-resistant sliding bearings replace rolling bearings: replacing traditional rolling bearings with self-lubricating wear-resistant sliding bearings; Sliding bearings have no rolling elements, are not sensitive to small amounts of powder entering the bearing, and have good dirt-holding capacity and dry friction resistance; even if a trace amount of powder seeps into the bearing working surface, it can still maintain normal operation and avoid sudden jamming.

[0010] Integrated structure: The bearing housing body has stepped mounting holes inside, three spiral sealing rings are installed at the front end, and a sliding bearing is press-fitted at the rear end. The structure is compact and easy to assemble and replace. It can be adapted to the existing screw feeder interface without modifying the main unit structure, and has good versatility and retrofit compatibility. Beneficial effects

[0011] Significantly extended service life: The wear rate of the spiral seal ring is greatly reduced, the sliding bearing is more resistant to contamination, and the service life of the entire bearing housing is increased by more than 3 times; Improved equipment uptime: Reduced unplanned downtime caused by seal failure, ensuring continuous production; Reduced maintenance costs: Extended maintenance cycle, reduced spare parts consumption, and reduced frequency of manual intervention; Simple and reliable structure: No external lubrication or cooling system is required, and it is suitable for harsh working conditions such as high temperature, dust, and corrosion. High versatility: It has been successfully tested in screw conveyor equipment in multiple industries such as chemical, deep processing of mineral products, and food, and the results have been remarkable. Attached Figure Description

[0012] The present invention will now be further described with reference to the accompanying drawings. Figure 1 This is a cross-sectional structural diagram of the present invention. Detailed Implementation

[0013] An improved sealed bearing housing for a screw feeder, such as Figure 1 As shown, the screw feeder housing includes a bearing seat 1, on which the end shaft 3 of the screw conveyor 2 is mounted via bearings and a sealing device. The front end of the bearing seat 1 has stepped large, medium, and small diameter fitting holes arranged sequentially from the outside to the inside. A sealing sleeve 4, which mates with the end shaft 3 of the screw conveyor 2, is installed in the large diameter fitting hole. A sealing ring 6 is installed in the medium diameter fitting hole. The sealing ring 6 mates with a connecting shaft 5 fixed to the end shaft 3. Reverse spiral grooves 7, which mate with the end shaft 3 and the connecting shaft 5, are respectively provided on the inner walls of the sealing sleeve 4 and the sealing ring 6. The reverse spiral grooves 7 rotate in the opposite direction to the end shaft 3 and the connecting shaft 5. The outer end wall of the sealing ring 6 and the connecting shaft 5 passing through the small diameter fitting hole form an oil chamber 8. The connecting shaft 5 passing through the oil chamber 8 mates with a sliding bearing 9 installed in the rear bearing hole of the bearing seat 1. Two sealing sleeves 4 are fitted into the large diameter fitting hole. Sealing grooves 10 are respectively provided on the outer walls of the sealing sleeve 4 and the sealing ring 6, and sealing rings that mate with the mating hole walls are installed in the sealing grooves 10. An oil filling hole 11 communicating with the oil chamber 8 is provided on the bearing housing 1.

Claims

1. An improved sealed bearing housing for a screw feeder, comprising a bearing housing (1) disposed on the screw feeder housing, wherein the bearing housing (1) is fitted with the end shaft (3) of a screw conveyor (2) via a bearing and a sealing device, characterized in that: The front end of the bearing housing (1) is provided with stepped large, medium and small diameter fitting holes from the outside to the inside. A sealing sleeve (4) that fits with the end shaft (3) of the screw conveyor is installed in the large diameter fitting hole. A sealing ring (6) is installed in the medium diameter fitting hole. The sealing ring (6) fits with the connecting shaft (5) that is fixed to the end shaft (3). On the inner wall of the sealing sleeve (4) and the sealing ring (6), there are reverse spiral grooves (7) that fit with the end shaft (3) and the connecting shaft (5), respectively. The reverse spiral grooves (7) rotate in the opposite direction to the end shaft (3) and the connecting shaft (5). The outer end wall of the sealing ring (6) and the connecting shaft (5) that passes through the small diameter fitting hole form an oil chamber (8). The connecting shaft (5) that passes through the oil chamber (8) fits with the sliding bearing (9) installed in the bearing hole at the rear end of the bearing housing (1).

2. An improved sealed bearing housing for a screw feeder according to claim 1, characterized in that: Two sealing sleeves (4) are installed inside the large-diameter mating hole.

3. An improved sealed bearing housing for a screw feeder according to claim 1, characterized in that: in Sealing grooves (10) are provided on the outer walls of the sealing sleeve (4) and the sealing ring (6), and a sealing ring that matches the wall of the mating hole is installed in the sealing groove (10).

4. An improved sealed bearing housing for a screw feeder according to claim 1, characterized in that: An oil injection hole (11) communicating with the oil chamber (8) is provided on the bearing housing (1).

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