A composite sealing structure of a screw conveyor drive shaft and a screw conveyor

Abstract

The utility model provides a spiral conveyor drive shaft composite formula sealing structure and spiral conveyor, spiral conveyor drive shaft composite formula sealing structure includes bearing frame, bearing gland, bearing chamber, bearing, sealing chamber, packing ring, spiral auger and spiral conveyor shell, bearing frame assembly is in both ends of spiral conveyor shell, spiral auger has welded to have dynamic labyrinth seal, bearing frame has welded to have static labyrinth seal, dynamic labyrinth seal and static labyrinth seal two cooperation form labyrinth seal, the sealing chamber of installing packing ring is fastened on bearing frame, bearing chamber is fixed in one end of bearing frame, and the bearing is arranged in bearing chamber, one side of bearing chamber is provided with bearing gland, and the bearing gland is fastened on bearing frame. The utility model discloses simple structure, and equipment dismounts maintenance is simple, and through the double effect of labyrinth seal and packing seal, has good sealing performance. Spiral conveyor with the sealing device is suitable for the conveying of small particle, powder and other dust materials.

Description

Technical Field

[0001] This utility model relates to sealing technology for screw conveyors, and more particularly to a composite sealing structure for the drive shaft of a screw conveyor and a screw conveyor. Background Technology

[0002] Currently, when screw conveyors are used to transport powder materials, the problem of dust leakage at the shaft end often occurs. This not only affects the working environment but also leads to the risk of cross-contamination. Moreover, the dust leakage at the end often occurs because dust inside the screw conveyor cavity overflows through the bearings, making the bearings more prone to damage, increasing production costs, and adding to the maintenance workload. Utility Model Content

[0003] The purpose of this invention is to address the problems of material leakage at the shaft end of screw conveyors, which leads to easy bearing damage, high dust levels, and cross-contamination. This invention proposes a composite sealing structure for the drive shaft of screw conveyors. This composite sealing structure is simple, simplifies disassembly and maintenance, and provides excellent sealing performance through the dual action of labyrinth seal and packing seal. Screw conveyors equipped with this sealing device are suitable for conveying small particles, powders, and other dusty materials.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a composite sealing structure for the drive shaft of a screw conveyor, comprising a bearing bracket, a bearing cover, a bearing chamber, a bearing, a sealing chamber, and a packing ring;

[0005] The two bearing brackets are respectively bolted to both ends of the screw conveyor housing; the screw auger passing through the screw conveyor housing has dynamic labyrinth seals welded to both ends; a static labyrinth seal is welded to the end of the bearing bracket closest to the screw conveyor housing (the static labyrinth seal is located inside the screw conveyor housing), and the dynamic labyrinth seal and the static labyrinth seal cooperate to form a labyrinth seal; the sealing chamber is bolted to the bearing bracket (the bearing bracket is away from the static labyrinth seal, and the sealing chamber is located inside the bearing bracket), and the packing ring is installed inside the sealing chamber;

[0006] The bearing housing is fixed at the end of the bearing frame away from the screw conveyor housing. The bearing is housed within the bearing housing, and a bearing cover is provided on the side of the bearing housing facing the bearing frame. The bearing cover is fastened to the bearing frame with bolts. When the screw conveyor is conveying materials, the labyrinth seals at both ends of the screw conveyor housing and the double seal of the packing work together to ensure no material or dust leakage.

[0007] Furthermore, flanges are welded to both ends of the screw conveyor housing, and flanges are also welded to both ends of the bearing bracket. The flanges of the screw conveyor housing and the bearing bracket have the same hole spacing, hole position, and hole diameter.

[0008] Furthermore, the bearing bracket flange has a notch, which can assist in positioning during installation.

[0009] Furthermore, the moving labyrinth seal shaft hole welded on the spiral auger has the same diameter as the corresponding shaft diameter of the spiral auger.

[0010] Furthermore, the static labyrinth seal and the dynamic labyrinth seal are used together to form a labyrinth seal. The width and length of the labyrinth channel must be appropriate, and it must have multiple labyrinth seals.

[0011] Furthermore, an inspection port is provided in the middle of the bearing bracket for tightening bolts and routine inspections.

[0012] Furthermore, the bearing bracket has a first threaded hole at one end near the screw conveyor housing for fixing the sealing chamber with bolts.

[0013] Furthermore, a second threaded hole is provided at the end of the bearing bracket away from the screw conveyor housing for fixing the bearing chamber with bolts.

[0014] Furthermore, a third threaded hole is provided on one side of the bearing housing for fixing the bearing housing to the bearing bracket; a fourth threaded hole is provided on the other side for fixing the bearing cover with a fifth threaded hole by bolts.

[0015] Furthermore, the shaft holes of the bearing chamber, the bearing cover, and the sealing chamber are clearance-fitted with the corresponding shaft diameters of the auger.

[0016] The working principle of this utility model's composite sealing structure for the drive shaft of a screw conveyor is as follows: During operation, the screw conveyor transports materials, and the dust raised is first blocked by the labyrinth seal. Any small amount of material that manages to pass through the labyrinth seal is completely blocked at the packing ring, preventing leakage. This ensures that the bearing is dust-free and can operate stably for a long time, while also preventing dust from being generated in the environment. This utility model's composite sealing device for the drive shaft of a screw conveyor completely avoids the problem of dust leakage from its structural design.

[0017] Another objective of this utility model is to disclose a screw conveyor that employs the aforementioned composite sealing structure for the screw conveyor drive shaft.

[0018] This utility model relates to a composite sealing structure for the drive shaft of a screw conveyor and a screw conveyor, which has the following advantages compared with the prior art:

[0019] 1) The composite sealing structure of the screw conveyor drive shaft of this utility model is simple, easy to clean, maintain and repair, and reduces the amount of subsequent maintenance work from the structural design stage;

[0020] 2) The composite sealing structure of the screw conveyor drive shaft of this utility model is reasonable, which avoids material leakage at the shaft end from the design, improves the on-site environment, and prevents cross-contamination between different types of products;

[0021] 3) When the screw conveyor of this utility model is used for material conveying, the labyrinth seals on both sides and the double seal of the packing work together to ensure that no material or dust leaks out. Production practice has proven that the composite sealing structure of the drive shaft of the screw conveyor of this utility model has fully achieved the expected effect. The screw conveyor equipped with the aforementioned sealing device is suitable for conveying small particles, powders, and other dusty materials. Attached Figure Description

[0022] Figure 1 Schematic diagram of the composite sealing structure for the drive shaft of a screw conveyor;

[0023] Figure 2 A partially enlarged view of the assembly of the composite sealing structure of the screw conveyor drive shaft;

[0024] Figure 3 This is a schematic diagram of the bearing bracket structure;

[0025] Figure 4 This is a schematic diagram of the bearing cap structure;

[0026] Figure 5 This is a schematic diagram of the bearing housing structure;

[0027] Figure 6 This is a schematic diagram of the sealed chamber structure;

[0028] Figure 7 This is a schematic diagram of the casing structure of a screw conveyor;

[0029] Figure 8 This is a schematic diagram of a spiral auger structure. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments:

[0031] Example 1

[0032] This embodiment discloses a composite sealing structure for the drive shaft of a screw conveyor, such as... Figure 1-8As shown, it includes a bearing frame 1, a bearing cover 2, a bearing chamber 3, a bearing 4, a sealing chamber 5, a packing ring 6, a screw conveyor housing 7, and a screw auger 8. The spiral auger 8 is installed inside the spiral conveyor housing 7, and a dynamic labyrinth seal 81 is welded on it. In this embodiment, the dynamic labyrinth seal 81 is E-shaped. A static labyrinth seal 14 is welded on the bearing frame 1. In this embodiment, the static labyrinth seal 14 is E-shaped. The dynamic labyrinth seal 81 and the static labyrinth seal 14 together form a labyrinth seal. The bearing frame 1 and the spiral conveyor housing 7 are fastened together by bolts. The packing ring 6 is installed inside the sealing chamber 5. The sealing chamber 5 is fastened to the inner wall 15 of the bearing frame 1 near the end of the spiral conveyor housing 7 by bolts. The sealing chamber 5 and the static labyrinth seal 14 are located on the inner wall 15 and the outer wall of the bearing frame 1 near the end of the spiral conveyor housing 7, respectively. The bearing 4 is installed inside the bearing chamber 3, and a bearing cover 2 is provided on the outer side. The bearing chamber 3 is fastened to the inner wall of the bearing frame 1 away from the spiral conveyor housing 7 by bolts. When the screw conveyor is conveying materials, the labyrinth seals and packing double seals on both sides of the screw conveyor housing 7 work together to ensure that no material dust leaks out.

[0033] The screw conveyor housing 7 has standard flanges welded to both sides. The flange model, hole spacing, hole position, and hole diameter are the same as those of the bearing bracket 1 flange. The bearing bracket 1 flange has a notch for auxiliary positioning during installation. In this embodiment, a DN200Pg16 flange is selected, and only a straight flange with a straight opening of 3mm is machined; the notch depth of the bearing bracket 1 flange is 3mm.

[0034] A moving labyrinth seal 81 is welded onto the auger 8, and the shaft hole of the moving labyrinth seal 81 has the same diameter as the corresponding shaft hole of the auger 8. In this embodiment, the diameter of the moving labyrinth seal shaft hole is 80mm.

[0035] The static labyrinth seal 14 and the dynamic labyrinth seal 81 work together to form a labyrinth seal. The width and length of the labyrinth channel must be appropriate, and multiple labyrinth seals are required. In this embodiment, the dynamic labyrinth seal and the static labyrinth seal are combined to form a 5-layer labyrinth channel, with a width of 2mm and a length of 53mm.

[0036] The bearing bracket 1 has an inspection port 12 in the middle for tightening bolts and routine inspection.

[0037] The bearing bracket 1 has a first threaded hole 13 at one end near the screw conveyor housing 7 for fixing the sealing chamber 5 with bolts. In this embodiment, the threaded hole is M8 and there are four of them.

[0038] The bearing bracket 1 has a second threaded hole 11 at the end away from the screw conveyor housing 7 for fixing the bearing chamber 3 with bolts. In this embodiment, the threaded hole is M20 and there are 8 of them.

[0039] The bearing housing 3 has a third threaded hole 31 on one side for fixing the bearing housing to the bearing bracket; and a fourth threaded hole 32 on the other side for fixing to the bearing cap 2, which has a fifth threaded hole 21, by bolts. In this embodiment, the bearing housing has 8 through holes with a diameter of 22mm on one side; and 4 threaded holes of M8 size on the other side, with a depth of 25mm.

[0040] The shaft holes of the bearing chamber 3, the bearing cap 2, and the sealing chamber 5 are clearance-fitted with the corresponding shaft diameters of the auger. In this embodiment, the shaft hole diameter is 2mm larger than the corresponding shaft diameter of the auger.

[0041] Example 2

[0042] This embodiment discloses a screw conveyor that uses the composite sealing device for the drive shaft of the screw conveyor described in Embodiment 1.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A composite sealing structure for the drive shaft of a screw conveyor, characterized in that, It includes a bearing frame (1), a bearing cover (2), a bearing chamber (3), a bearing (4), a sealing chamber (5), a packing ring (6), a screw conveyor housing (7), and a screw auger (8); The two bearing brackets (1) are respectively fastened to both ends of the screw conveyor housing (7) by bolts; the screw auger (8) passing through the screw conveyor housing (7) has dynamic labyrinth seals (81) welded to both ends; a static labyrinth seal (14) is welded to one end of the bearing bracket (1) near the screw conveyor housing (7), and the dynamic labyrinth seal (81) and the static labyrinth seal (14) cooperate to form a labyrinth seal; the sealing chamber (5) is fastened to the bearing bracket (1) by bolts, and the packing ring (6) is installed in the sealing chamber (5); The bearing chamber (3) is fixed at one end of the bearing frame (1) away from the screw conveyor housing (7). The bearing (4) is set inside the bearing chamber (3). A bearing cover (2) is provided on the side of the bearing chamber (3) facing the bearing frame (1). The bearing cover (2) is fastened to the bearing frame (1) by bolts.

2. The composite sealing structure for the screw conveyor drive shaft according to claim 1, characterized in that, Flanges are welded to both ends of the screw conveyor housing (7), and flanges are also welded to both ends of the bearing frame (1). The flanges of the screw conveyor housing (7) and the flanges of the bearing frame (1) have the same hole spacing, hole position and hole diameter.

3. The composite sealing structure for the screw conveyor drive shaft according to claim 1, characterized in that, The bearing bracket (1) has a notch on its flange.

4. The composite sealing structure for the screw conveyor drive shaft according to claim 1, characterized in that, The shaft hole of the dynamic labyrinth seal (81) welded on the spiral auger (8) has the same shaft diameter as the corresponding position of the spiral auger.

5. The composite sealing structure for the screw conveyor drive shaft according to claim 1, characterized in that, The bearing bracket (1) has an inspection port (12) in the middle.

6. The composite sealing structure for the drive shaft of the screw conveyor according to claim 1, characterized in that, The bearing bracket (1) has a first threaded hole (13) at one end near the screw conveyor housing (7) for fixing the sealing chamber (5) with bolts.

7. The composite sealing structure for the screw conveyor drive shaft according to claim 1, characterized in that, The bearing bracket (1) has a second threaded hole (11) at one end away from the screw conveyor housing (7) for fixing the bearing chamber (3) with bolts.

8. The composite sealing structure for the screw conveyor drive shaft according to claim 1, characterized in that, The bearing housing (3) has a third threaded hole (31) on one side for fixing the bearing housing to the bearing bracket (1); and a fourth threaded hole (32) on the other side for fixing the bearing cover (2) with a fifth threaded hole (21) by bolts.

9. The composite sealing structure for the drive shaft of the screw conveyor according to claim 1, characterized in that, The shaft holes of the bearing chamber (3), the bearing cover (2), and the sealing chamber (5) are clearance fit with the corresponding shaft diameters of the auger.

10. A screw conveyor, characterized in that, The composite sealing structure for the drive shaft of the screw conveyor as described in any one of claims 1-9 is adopted.

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