Sealing structure of spiral metering scale

Abstract

The utility model discloses a sealing structure of a spiral metering scale, and relates to the technical field of spiral metering scales, and the sealing structure is characterized in that the front end and the rear end of a conveying pipe are sealed with a spiral rod through sealing assemblies; the sealing assembly comprises a fixing flange plate arranged at the end of the conveying pipe and a conveying pipe end cover connected with the fixing flange plate, a bearing seat is arranged at the end, away from the conveying pipe, of the conveying pipe end cover, a bearing end cover is arranged at the end, away from the conveying pipe, of the bearing seat, and the screw rod penetrates through the bearing end cover. A sealing ring A is arranged between the screw rod and the conveying pipe end cover, a bearing is arranged between the screw rod and the bearing seat, and a sealing ring B is arranged between the screw rod and the bearing end cover; a velometer cover is arranged on a bearing end cover at the front end of the conveying pipe, and the velometer is located in the velometer cover. Therefore, the sealing problem of the spiral conveyor is solved, dust is prevented from invading into the bearing, the service life of the bearing is prolonged, the maintenance cost is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of screw weighing scales, and in particular to a sealing structure for a screw weighing scale. Background Technology

[0002] A screw conveyor is a device used for conveying and measuring granular materials. It is widely used in modern industrial production, especially in the chemical, food, and feed industries. It requires a screw conveyor to work in conjunction with the screw conveyor to complete the measurement of materials. It is mainly used for measuring powdery or small granular materials. The rotating screw propels the material, continuously conveying it within a closed tube. It operates stably and reliably, with no dust emissions.

[0003] When conveying and measuring objects, a screw rod is inserted through the rear end of the conveying pipe to connect with the power element and drive the screw rod to rotate. A speed measuring device is also installed at the front end. The bearing at the front end cannot be sealed, and there is a possibility of material intrusion into the conveying pipe. Moreover, with long-term operation, external impurities may also intrude, which will greatly reduce the service life of the bearing. Maintenance and replacement will reduce work efficiency, increase costs, and affect the normal use of the screw weighing scale. Utility Model Content

[0004] To solve the sealing problem of screw conveyors, prevent dust from entering the bearings, improve the service life of the bearings, and reduce maintenance costs, this application provides a sealing structure for a screw weighing scale.

[0005] The sealing structure of the spiral weighing scale provided in this application adopts the following technical solution.

[0006] A sealing structure for a screw weighing scale includes a conveying pipe and a screw rod rotatably disposed inside the conveying pipe. A speed measuring device for detecting the rotation of the screw rod is provided at the front end of the conveying pipe. The conveying pipe is also sealed to the screw rod at both the front and rear ends by a sealing assembly.

[0007] The sealing assembly includes a fixed flange disposed at the end of the conveying pipe, a conveying pipe end cap connected to the fixed flange, a bearing seat disposed at the end of the conveying pipe end cap away from the conveying pipe, a bearing end cap disposed at the end of the bearing seat away from the conveying pipe, a spiral rod passing through the bearing end cap, a sealing ring A disposed between the spiral rod and the conveying pipe end cap, a bearing disposed between the spiral rod and the bearing seat, and a sealing ring B disposed between the spiral rod and the bearing end cap.

[0008] A speed measuring device cover is provided on the bearing end cover at the front end of the conveying pipe, and the speed measuring device is located inside the speed measuring device cover.

[0009] By adopting the above technical solution, the screw can rotate inside the conveying pipe through the bearing configuration. The sealing ring A seals the connection between the conveying pipe's bore and the bearing, preventing material or impurities from entering the bearing. The bearing end cover and sealing ring B prevent external impurities from entering the bearing, thus providing comprehensive sealing and protection. The speedometer cover also provides protection, preventing external impurities from entering sealing ring B, further enhancing the sealing and dustproof effect.

[0010] Optionally, the end cap of the conveying pipe is connected to the fixed flange by bolts, and the end cap of the conveying pipe is provided with a snap-fit ​​part A, the edge of which abuts against the inner wall of the conveying pipe.

[0011] By adopting the above technical solution, the bolt connection method is simple and reliable. The edge of the snap-fit ​​part A abuts against the inner wall of the conveying pipe 1, which can play an auxiliary positioning role, making it easy to install and disassemble. At the same time, it is also conducive to improving the connection stability and sealing.

[0012] Optionally, a partition is provided between the end cap of the conveying pipe and the bearing seat. The bearing seat near the partition has a protruding snap-fit ​​part B and a recessed part corresponding to the position of the partition. The bearing seat, the partition and the end cap of the conveying pipe are connected by bolts.

[0013] By adopting the above technical solution, the design of the snap-fit ​​part B facilitates the positioning and installation of the partition and bearing seat, and also helps to improve the connection stability and sealing performance.

[0014] Optionally, a sealing groove A is provided at the end of the inner ring of the conveying pipe end cap near the partition, and a sealing groove B is provided at the end of the inner ring of the bearing seat near the partition. A sealing ring A is provided in both the sealing groove A and the sealing groove B.

[0015] By adopting the above technical solution, the partition divides the two sealing grooves to form two sealing rings A, which helps to improve the sealing and dustproof effect.

[0016] Optionally, the two sealing rings A are installed in opposite directions, and the sealing rings A include J-shaped frameless rubber oil seals.

[0017] Optionally, the inner ring of the bearing housing is provided with a positioning part A, the outer ring of the bearing near the conveying pipe abuts against the positioning part A, and the end of the bearing end cover near the bearing housing is provided with a positioning part B, the positioning part B abuts against the outer ring of the bearing.

[0018] The end of the helical rod is a stepped shaft, and the inner ring of the bearing abuts against the shoulder of the shaft.

[0019] By adopting the above technical solution, the axial positioning of the bearing is achieved through the cooperation of the shaft shoulder, positioning part A, positioning part B and the bearing.

[0020] Optionally, the bearing end cap, speedometer cover, and bearing seat at the front end of the delivery pipe are connected by bolts.

[0021] By adopting the above technical solution, the bearing end cover, the speedometer cover and the bearing housing are connected by bolts, which is a simple and reliable connection method.

[0022] Optionally, the bearing at the front end of the conveying pipe is a double-row radial spherical ball bearing, and the bearing at the rear end of the conveying pipe is a single-row radial thrust ball bearing.

[0023] By adopting the above technical solution, double-row radial spherical ball bearings have self-aligning properties and are mainly used to bear radial loads, while also being able to withstand smaller axial loads.

[0024] Optionally, a sealing groove C is provided on the inner wall of the bearing end cover, and a sealing ring B is disposed in the sealing groove C. The sealing ring B includes a felt oil seal.

[0025] By adopting the above technical solution, the opening of the sealing groove C facilitates the installation of the felt oil seal.

[0026] Optionally, a threaded rod is threadedly connected to the bearing end cap at the front end of the conveying pipe, the speed measuring device is mounted on the fixed plate, the threaded rod passes through the fixed plate, and nuts are tightened on the threaded rods on both sides of the fixed plate;

[0027] The speed measuring device cover has a communication hole for the wire harness of the speed measuring device to pass through.

[0028] By adopting the above technical solution, the threaded rod is designed to facilitate connection and fixation with the bearing end cover, and the threaded rod and nut cooperate to facilitate the installation and fixation of the speed measuring device.

[0029] In summary, this application includes at least the following beneficial effects:

[0030] 1. This application achieves the rotation of the screw rod within the conveying pipe through the bearing configuration. The sealing ring A seals the connection between the conveying pipe's bore and the bearing, preventing material or impurities from entering the bearing. Furthermore, the partition plate divides the pipe, forming two sealing rings A, which enhances the sealing and dustproofing effect. The bearing end cover and sealing ring B prevent external impurities from entering the bearing, providing comprehensive sealing protection and preventing impurity intrusion. The speedometer cover also provides protection, preventing external impurities from entering the sealing ring B, further improving the sealing and dustproofing effect.

[0031] 2. This application uses a bolted connection method, which is simple and reliable. The edge of the snap-fit ​​part A abuts against the inner wall of the conveying pipe, which can play an auxiliary positioning role, facilitating installation and disassembly, and also helps to improve connection stability and sealing. The snap-fit ​​part B facilitates the positioning and installation of the partition and bearing seat. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a screw conveyor for a screw weighing scale.

[0034] Figure 2 This is a partial cross-sectional structural diagram of the screw conveyor of a screw weighing scale.

[0035] Figure 3 yes Figure 2 A magnified schematic diagram of part A in the middle.

[0036] Figure 4 yes Figure 2 A magnified schematic diagram of part B in the middle section.

[0037] Explanation of reference numerals in the attached drawings: 1. Conveying pipe; 2. Screw rod; 3. Power element; 4. Speedometer; 5. Fixed flange; 6. Conveying pipe end cap; 7. Snap-fit ​​part A; 8. Bearing seat; 9. Partition plate; 10. Snap-fit ​​part B; 11. Sealing groove A; 12. Sealing groove B; 13. Bearing; 14. Positioning part A; 15. Positioning part B; 16. Bearing end cap; 17. Sealing groove C; 18. Speedometer cover; 19. Communication hole; 20. Threaded rod; 21. Fixing plate. Detailed Implementation

[0038] 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.

[0039] The following is in conjunction with the appendix Figures 1 to 4 This application will be described in further detail.

[0040] This application discloses a sealing structure for a spiral weighing scale.

[0041] Reference Figure 1A screw conveyor for a screw weighing scale includes a conveying pipe 1, a screw rod 2, a power element 3, and a speed measuring device 4. The power element 3 drives the screw rod 2 to rotate in the conveying pipe 1 to propel the material. The speed measuring device 4 is located at the front end of the conveying pipe 1 and is used to detect the rotation of the screw rod 2.

[0042] Reference Figures 2 to 4 A sealing structure for a screw weighing scale includes a sealing assembly, wherein the front and rear ends of the conveying pipe 1 are sealed to the screw rod 2 through the sealing assembly.

[0043] The sealing assembly includes a fixed flange 5, a delivery pipe end cap 6, a bearing housing 8, and a bearing end cap 16.

[0044] The fixed flange 5 is set at the end of the conveying pipe 1 and is integrally formed with the conveying pipe 1. The conveying pipe end cover 6 is fixedly connected to the fixed flange 5 by bolts. The bolt connection method is simple and reliable. The end of the conveying pipe end cover 6 near the conveying pipe 1 has a protruding snap-fit ​​part A7. The snap-fit ​​part A7 is a protruding shaft. The edge of the snap-fit ​​part A7 abuts against the inner wall of the conveying pipe 1, that is, the outer diameter of the shaft can match the inner diameter of the hole. The edge of the snap-fit ​​part A7 abuts against the inner wall of the conveying pipe 1, which can play an auxiliary positioning role, facilitate installation and disassembly, and also help improve the connection stability and sealing performance.

[0045] The bearing housing 8 is located at the end of the conveying pipe end cap 6 away from the conveying pipe 1. A partition 9 is provided between the bearing housing 8 and the conveying pipe end cap 6. The bearing housing 8, partition 9, and conveying pipe end cap 6 are fixedly connected by bolts. A snap-fit ​​part B10 is provided protruding at the end of the bearing housing 8 near the partition 9, and a recessed part is provided corresponding to the position of the partition 9. The snap-fit ​​part B10 facilitates the positioning and installation of the partition 9 and the bearing housing 8, and also helps to improve the connection stability and sealing performance.

[0046] A sealing groove A11 is formed on the inner ring of the conveying pipe end cap 6 near the partition plate 9, and a sealing groove B12 is formed on the inner ring of the bearing seat 8 near the partition plate 9. Both sealing grooves A11 and B12 contain sealing rings A. The partition plate 9 divides the two sealing grooves, forming two sealing rings A, which, together with the spiral rod 2, create a seal, improving the sealing and dustproof effect. The two sealing rings A are installed in opposite directions, and each sealing ring A includes a J-shaped frameless rubber oil seal.

[0047] A bearing 13 is installed between the screw rod 2 and the bearing housing 8. The bearing 13 at the front end of the conveying pipe 1 is a double-row radial spherical ball bearing, and the bearing 13 at the rear end of the conveying pipe 1 is a single-row radial thrust ball bearing. The double-row radial spherical ball bearing has self-aligning properties and is mainly used to bear radial loads, while it can also bear small axial loads.

[0048] The bearing housing 8 has a positioning part A14 on its inner ring, which is the smaller section of the inner diameter of the bearing housing 8. The outer ring of the bearing 13 near the conveying pipe 1 abuts against the positioning part A14. The bearing end cover 16 has a positioning part B15 near the bearing housing 8, which abuts against the outer ring of the bearing 13. The end of the screw rod 2 is a stepped shaft, and the inner ring of the bearing 13 abuts against the shaft shoulder. Through the cooperation of the shaft shoulder, positioning part A14, and positioning part B15 with the bearing 13, the axial positioning of the bearing 13 is achieved.

[0049] The bearing end cover 16 is located at the end of the bearing housing 8 away from the conveying pipe 1 and is fixedly connected to the bearing housing 8 by bolts. A sealing groove C17 is provided on the inner wall of the bearing end cover 16, and a sealing ring B is provided in the sealing groove C17. The sealing ring B includes a felt oil seal. The opening of the sealing groove C17 facilitates the installation of the felt oil seal and forms a seal with the screw rod 2.

[0050] A speedometer cover 18 is provided on the bearing end cap 16 at the front end of the conveying pipe 1. The speedometer cover 18 is located at the end of the bearing end cap 16 away from the conveying pipe 1. The bearing end cap 16, the speedometer cover 18, and the bearing seat 8 are connected by bolts, which is a simple and reliable connection method. The speedometer 4 is located inside the speedometer cover 18. A communication hole 19 is provided on the speedometer cover 18 for the wiring harness of the speedometer 4 to pass through. The speedometer 4 is prior art disclosed in this art and will not be described in detail here.

[0051] A threaded rod 20 is threadedly connected to the bearing end cap 16 at the front end of the delivery pipe 1 and is tightened by screwing in a nut. The speed detector 4 is mounted on a fixing plate 21, with the threaded rod 20 passing through the fixing plate 21. Nuts are tightened on the threaded rods 20 on both sides of the fixing plate 21 to fix the speed detector 4. The threaded rod 20 facilitates connection and fixation with the bearing end cap 16, and the engagement of the threaded rod 20 with the nut facilitates the installation and fixation of the speed detector 4.

[0052] The bearing 13 allows the screw rod 2 to rotate within the conveying pipe 1. The sealing ring A seals the connection between the pipe hole of the conveying pipe 1 and the bearing 13, preventing material or impurities from entering the bearing 13. The bearing end cover 16 and the sealing ring B prevent external impurities from entering the bearing 13, thus providing comprehensive sealing and protection. The speedometer cover 18 also provides protection, preventing external impurities from entering the sealing ring B and further enhancing the sealing and dustproof effect.

[0053] In the description of this utility model, it should be understood that the terms "end," "front end," "one end," "both sides," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise specified and limited, it should be noted that the term "connection" should be interpreted broadly. For example, it can be a mechanical connection or an electrical connection, or it can be a connection within two components, which can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0054] The above are merely preferred embodiments of the utility model and are not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the utility model should be included within the protection scope of the utility model.

Claims

1. A sealing structure of a screw metering scale, comprising a conveying pipe and a screw shaft rotatably arranged in the conveying pipe, a tachometer for detecting rotation of the screw shaft is arranged at a front end of the conveying pipe, characterized in that, Also include: The front and rear ends of the conveying pipe are sealed with the screw rod through the sealing assembly; The sealing assembly includes a fixed flange plate arranged at the end of the conveying pipe, a conveying pipe end cover connected with the fixed flange plate, a bearing seat arranged at the end of the conveying pipe end cover away from the conveying pipe, a bearing end cover arranged at the end of the bearing seat away from the conveying pipe, a screw rod penetrating through the bearing end cover, a sealing ring A arranged between the screw rod and the conveying pipe end cover, a bearing arranged between the screw rod and the bearing seat, and a sealing ring B arranged between the screw rod and the bearing end cover. A tachometer cover is arranged on the bearing end cover at the front end of the conveying pipe, and the tachometer is located in the tachometer cover.

2. A seal for a spiral weigher according to claim 1, wherein The conveying pipe end cover and the fixed flange plate are connected by bolts, the conveying pipe end cover is provided with a clamping portion A, and the edge of the clamping portion A abuts against the inner wall of the conveying pipe.

3. The seal structure of a screw metering scale according to claim 1, wherein A partition plate is arranged between the conveying pipe end cover and the bearing seat, a clamping portion B is protrudingly arranged at one end of the bearing seat close to the partition plate, and the bearing seat, the partition plate and the conveying pipe end cover are connected by bolts.

4. A seal for a spiral weigher according to claim 3, wherein A sealing groove A is formed at one end of the inner ring of the conveying pipe end cover close to the partition plate, a sealing groove B is formed at one end of the inner ring of the bearing seat close to the partition plate, and a sealing ring A is arranged in the sealing groove A and the sealing groove B.

5. A seal for a spiral weigher according to claim 4, wherein The installation directions of the two sealing rings A are opposite, and the sealing ring A includes a J-shaped skeletonless rubber oil seal.

6. A seal for a spiral weigher according to claim 1, wherein The bearing seat inner ring is provided with a positioning portion A, the outer ring of the bearing close to the conveying pipe abuts against the positioning portion A, the bearing end cover close to the bearing seat is provided with a positioning portion B, and the positioning portion B abuts against the outer ring of the bearing. The end of the screw rod is a stepped shaft, and the inner ring of the bearing abuts against the shaft shoulder.

7. The seal for a spiral weigher according to claim 1, wherein The bearing end cover, the tachometer cover and the bearing seat at the front end of the conveying pipe are connected by bolts.

8. The seal for a spiral weigher of claim 1, wherein, The bearing at the front end of the conveying pipe is a double-row angular contact spherical bearing, and the bearing at the rear end of the conveying pipe is a single-row angular contact thrust spherical bearing.

9. The seal for a spiral weigher of claim 1, wherein, A sealing groove C is formed in the inner wall of the bearing end cover, the sealing ring B is arranged in the sealing groove C, and the sealing ring B includes a felt oil seal.

10. The seal for a spiral weigher according to claim 1, wherein A threaded rod is threadedly connected to the bearing end cover at the front end of the conveying pipe, the tachometer is arranged on a fixed sheet, the threaded rod penetrates through the fixed sheet, and nuts are tightly screwed on the threaded rods on both sides of the fixed sheet. A communication hole is formed in the tachometer cover for penetrating the wire harness of the tachometer.

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