Structure for prolonging sealing life of feeding machine

Abstract

The structure comprises a material hopper, a stirring mechanism is arranged in the material hopper, a transmission shaft of the stirring mechanism extends out of one side of the material hopper, the material hopper is provided with a lengthened sealing part, the transmission shaft penetrates through the lengthened sealing part and is rotationally connected with the lengthened sealing part, the lengthened sealing part is provided with a neck pipe part, and the neck pipe part is provided with a neck pipe. A lengthened axial sealing structure is formed by the neck tube part, and the end part of the neck tube part is connected with a shaft sleeve through a quick release structure; and a polytetrafluoroethylene sleeve is arranged in the pipe passing part. According to the structure for prolonging the service life of the feeder seal, materials are far away from the framework oil seal as far as possible, and abrasion of the materials to the framework oil seal is reduced. Therefore, compared with a conventional structure, the service life of the framework oil seal is greatly prolonged. The structure adopts a quick-dismounting mode, is convenient to dismount and clean, and is suitable for pharmaceutical and food industries.

Description

Technical Field

[0001] The utility model relates to the technical field of shaft end seals, in particular to a structure for improving the seal life of a feeder. Background Art

[0002] The sealing structure of the transmission parts of feeders in many industries such as rubber and plastics, pharmaceuticals, food, and chemicals often adopts the form of skeleton oil seals.

[0003] In the feeding machine equipment, the end face of the skeleton oil seal is in full contact with the material. Due to structural reasons, the material wears on the sealing lip of the skeleton oil seal for a long time. The service life of the skeleton oil seal is short and needs to be replaced frequently. The lubricating oil of the transmission parts will leak into the material.

[0004] When transporting medicines, foods and precious materials, the skeleton oil seal often fails, resulting in contamination of the materials, causing scrapping and losses.

[0005] In view of the above, it is necessary to propose a structure for improving the seal life of the feeder to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to solve the above technical problems and provide a structure for improving the sealing life of a feeder.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a structure for improving the sealing life of a feeder, comprising a material hopper, a stirring mechanism is arranged inside the material, a transmission shaft of the stirring mechanism extends from one side of the material hopper, the material hopper is provided with an extended sealing portion, the transmission shaft passes through the extended sealing portion and is rotatably connected thereto, the extended sealing portion has a neck tube portion, the neck tube portion forms an extended axial sealing structure, the end of the neck tube portion is connected to a shaft sleeve via a quick-release structure; a polyfluoro sleeve is arranged inside the neck tube portion.

[0008] Furthermore, an outer wall of the polytetrafluoroethylene sleeve and the neck tube portion are in interference fit, and an inner wall of the polytetrafluoroethylene sleeve and the transmission shaft are in clearance fit.

[0009] Furthermore, an oil-free bushing is provided inside the shaft sleeve, and a skeleton oil seal is provided at one end of the oil-free bushing facing the polytetrafluoroethylene sleeve.

[0010] Furthermore, two skeleton oil seals are provided in back-to-back bonding, and a cross section of the skeleton oil seal is provided with a V-shaped expansion ring groove, and the expansion ring grooves of the two skeleton oil seals face the polytetrafluoroethylene sleeve and the oil-free bushing respectively.

[0011] Furthermore, a flange sealing ring is provided at one end of the polytetrafluoroethylene sleeve, and the flange sealing ring is arranged around the polytetrafluoroethylene sleeve.

[0012] Furthermore, the quick-release structure includes a first connecting flange, a second connecting flange, and a clamp. The first connecting flange is formed on the neck tube portion, and the second connecting flange is formed on the end of the shaft sleeve. The first connecting flange and the second connecting flange are connected in a clamping flange sealing ring shape, and the clamp tightly connects the first connecting flange and the second connecting flange.

[0013] Furthermore, the first connecting flange and the second connecting flange are both provided with sealing ring grooves on their end faces close to each other, and the flange sealing ring is provided with a raised sealing portion matching with the sealing ring groove.

[0014] Furthermore, the inner wall of the polytetrafluoroethylene sleeve forms a plurality of spiral ridges in the form of spiral lines, and the rotation direction of the spiral ridges is opposite to the rotation direction of the transmission shaft.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model adopts a structure for improving the sealing life of the feeder, which keeps the material away from the skeleton oil seal as much as possible, thereby reducing the wear of the material on the skeleton oil seal. Therefore, the service life of the skeleton oil seal is greatly increased compared with the conventional structure. The structure adopts a quick-release method, which is convenient for disassembly, cleaning and washing, and is suitable for the pharmaceutical and food industries. After long-term experiments and verification, it is difficult for the material to enter the PTFE sleeve under this structure, and only a thin ring is produced 2 to 4 mm away from the PTFE sleeve and the end face of the transmission shaft, and it no longer enters the PTFE sleeve to achieve the effect of self-sealing. The structure is easy to disassemble, install and clean, and solves the fundamental problem of contaminating materials caused by failure of the skeleton oil seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a structure for improving the sealing life of a feeder according to the utility model;

[0017] Figure 2 This is an exploded diagram of a structure for improving the sealing life of a feeder according to the utility model;

[0018] Figure 3 It is a schematic diagram of the spiral ridges in the polytetrafluoroethylene sleeve of the utility model;

[0019] In the figure: 1. material hopper; 2. stirring mechanism; 3. transmission shaft; 4. neck tube; 5. shaft sleeve; 6. PTFE sleeve; 7. oil-free bushing; 8. skeleton oil seal; 9. expansion ring groove; 10. flange sealing ring; 11. first connecting flange; 12. second connecting flange; 13. clamp; 14. sealing ring groove; 15. raised sealing part; 16. spiral convex ridge. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0021] A structure for improving the seal life of a feeder, such as Figure 1-3 As shown, it includes a material hopper 1, and a stirring mechanism 2 is arranged inside the material. The transmission shaft 3 of the stirring mechanism 2 extends from one side of the material hopper 1. The stirring mechanism 2 is driven by the transmission shaft 3 to stir and feed in the material hopper 1. Further, an extended sealing part is arranged in the material hopper 1, and the transmission shaft 3 passes through the extended sealing part and is rotatably connected thereto. The extended sealing part has a neck tube part 4, and the neck tube part forms an extended axial sealing structure. A polyfluoro sleeve 6 is arranged inside the neck tube part. The distance between the material in the material hopper 1 and the skeleton oil seal 8 is extended by the extended sealing part, so that the material can be effectively prevented from entering the skeleton oil seal 8.

[0022] Specifically, the outer wall of the PTFE sleeve 6 is interference fit with the neck tube 4, and the inner wall of the PTFE sleeve 6 is clearance fit with the transmission shaft 3. The PTFE sleeve 6 can seal the transmission shaft 3 and the neck tube 4, reduce the clearance between the transmission shaft 3 and the inner wall of the neck tube 4, and the sleeve made of PTFE material can be easily replaced, reduce friction resistance, and reduce noise. The clearance fit between the PTFE sleeve and the transmission shaft 3 can not only reduce the friction between the two, but also prevent materials from entering.

[0023] And the end of the neck tube portion 4 is connected to the shaft sleeve 5 through a quick release structure; Figure 1 , 2 As shown, an oil-free bushing 7 is provided inside the shaft sleeve 5, and a skeleton oil seal 8 is provided at one end of the oil-free bushing 7 facing the PTFE sleeve 6. In this embodiment, the skeleton oil seal 8 is separated from the material hopper 1 by the PTFE sleeve 6, so that the material can be effectively prevented from entering the skeleton oil seal 8.

[0024] Specifically, the skeleton oil seal 8 is provided with two back-to-back bonding, such as Figure 2 As shown, the cross section of the skeleton oil seal 8 is provided with a V-shaped expansion ring groove 9, and the expansion ring grooves 9 of the two skeleton oil seals 8 are respectively oriented toward the PTFE sleeve 6 and the oil-free bushing 7. Through the provision of the expansion ring groove 9, when material enters either side, it is squeezed into the expansion ring groove 9, and after the material enters, the expansion ring groove 9 is filled with the material and squeezed to expand toward the inner ring and the outer ring, thereby improving the sealing effect on the transmission shaft 3.

[0025] Furthermore, a flange sealing ring 10 is provided at one end of the PTFE sleeve 6, and the flange sealing ring 10 is arranged around the PTFE sleeve 6. The quick-release structure includes a first connecting flange 11, a second connecting flange 12, and a clamp 13. The first connecting flange 11 is formed on the neck tube portion 4, and the second connecting flange 12 is formed on the end of the shaft sleeve 5. The first connecting flange 11 and the second connecting flange 10 are connected in a clamping shape, and the clamp 13 is tightly connected to the first connecting flange 11 and the second connecting flange 12. Through this quick-release structure, rapid disassembly and assembly operations can be achieved, which is conducive to the replacement or maintenance of internal parts. In actual use, the clamp 13 is first removed to separate the connecting flanges on both sides from each other, so that the shaft sleeve 5 and the transmission shaft 3 can be pulled out. The skeleton oil seal 8 and the PTFE sleeve 6 are respectively on both sides of the opening of the quick-release structure, so that they can be replaced more easily without further disassembly.

[0026] The first connecting flange 11 and the second connecting flange 12 are provided with a sealing ring groove 14 on their end faces close to each other, and the flange sealing ring 10 is provided with a raised sealing portion 15 that matches the sealing ring groove 14. Figure 2 As shown, the raised sealing portion 15 is inserted into the sealing ring grooves 14 on both sides during installation, so that the sealing surfaces on both sides form a wave shape, which can achieve a better sealing effect on the material and improve its pressure resistance.

[0027] The inner wall of the PTFE sleeve 6 is formed with a plurality of spiral ridges 16, such as Figure 3 As shown, the spiral ridge 16 in the figure rotates clockwise. In actual use, the rotation direction of the transmission shaft 3 should be opposite to the rotation direction of the spiral ridge 16. Therefore, in this embodiment, the rotation direction of the transmission shaft 3 is the direction indicated by the dotted arrow in the figure, that is, counterclockwise rotation, so that the material can be better blocked; in actual use, the spiral ridge 16 is slightly raised by a certain height on the inner wall surface so that it is located in the gap of the clearance fit, so that the effect of blocking the material can be improved when the friction resistance is small.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A structure for improving the sealing life of a feeder, comprising a material hopper (1), a stirring mechanism (2) being arranged inside the material, a transmission shaft (3) of the stirring mechanism (2) extending from one side of the material hopper (1), characterized in that: The material hopper (1) is provided with an extended sealing portion, the transmission shaft (3) passes through the extended sealing portion and is rotatably connected thereto, the extended sealing portion has a neck tube portion (4), the neck tube portion forms an extended axial sealing structure, and the end of the neck tube portion (4) is connected to the shaft sleeve (5) via a quick-release structure; a polytetrafluoroethylene sleeve (6) is provided in the neck tube portion.

2. A structure for improving the sealing life of a feeder according to claim 1, characterized in that: An interference fit is formed between the outer wall of the polytetrafluoroethylene sleeve (6) and the neck tube portion (4), and a clearance fit is formed between the inner wall of the polytetrafluoroethylene sleeve (6) and the transmission shaft (3).

3. A structure for improving the sealing life of a feeder according to claim 1, characterized in that: An oil-free bushing (7) is provided inside the shaft sleeve (5), and a skeleton oil seal (8) is provided at one end of the oil-free bushing (7) facing the polytetrafluoroethylene sleeve (6).

4. A structure for improving the sealing life of a feeder according to claim 3, characterized in that: Two skeleton oil seals (8) are provided in back-to-back bonding, and a V-shaped expansion ring groove (9) is provided on the cross section of the skeleton oil seal (8). The expansion ring grooves (9) of the two skeleton oil seals (8) face the polytetrafluoroethylene sleeve (6) and the oil-free bushing (7), respectively.

5. The structure for improving the sealing life of a feeder according to claim 1, characterized in that: A flange sealing ring (10) is provided at one end of the polytetrafluoroethylene sleeve (6), and the flange sealing ring (10) is arranged around the polytetrafluoroethylene sleeve (6).

6. A structure for improving the sealing life of a feeder according to claim 5, characterized in that: The quick-release structure comprises a first connecting flange (11), a second connecting flange (12), and a clamp (13); the first connecting flange (11) is formed on the neck tube portion (4), the second connecting flange (12) is formed on the end of the shaft sleeve (5), the first connecting flange (11) and the second connecting flange (12) are connected in the shape of a clamping flange sealing ring (10), and the clamp (13) is used to tightly connect the first connecting flange (11) and the second connecting flange (12).

7. A structure for improving the sealing life of a feeder according to claim 6, characterized in that: The first connecting flange (11) and the second connecting flange (12) are both provided with a sealing ring groove (14) on their end faces close to each other, and the flange sealing ring (10) is provided with a raised sealing portion (15) matching the sealing ring groove (14).

8. The structure for improving the sealing life of a feeder according to claim 1, characterized in that: The inner wall of the polytetrafluoroethylene sleeve (6) forms a plurality of spiral ridges (16) in the form of helical lines, wherein the rotation direction of the spiral ridges (16) is opposite to the rotation direction of the transmission shaft (3).

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