Shaft seal system for granulator

Abstract

The utility model relates to the technical field of granulation, in particular to a shaft seal system for a granulator. Comprising a driving shaft and an end face disc, the driving shaft penetrates through the end face disc, the end face disc is provided with a channel for the driving shaft to penetrate through, and the inner diameter of the channel is larger than the diameter of the driving shaft; a sealing ring made of a polytetrafluoroethylene packing material is arranged between the end face disc and the driving shaft; an annular ring is arranged on the side face of the channel and abuts against the end face of the sealing ring. A pressing sleeve is arranged on the other side face of the end face disc and abuts against the other end face of the sealing ring. The pressing sleeve is provided with an outward-extending disc, and the diameter of the outward-extending disc is larger than that of the channel. At least three threaded blind holes are formed in the side, provided with the pressing sleeve, of the end face disc. At least three bolts are arranged on the overhanging disc and are meshed with the threaded blind holes; the depth of the threaded blind hole is greater than the length of the bolt; gap change caused by abrasion or thermal expansion of the sealing ring can be compensated, and sealing failure is prevented.

Description

Technical Field

[0001] This utility model relates to the field of granulation technology, and in particular to a fly ash granulator. Background Technology

[0002] A fly ash granulator is a device used to process fly ash into granular materials. Its core purpose is to improve the physical properties of fly ash through physical or chemical methods, facilitating subsequent resource utilization or safe disposal. The granulator uses an extrusion screw to compress fly ash into uniform granules.

[0003] When a granulator uses an extrusion screw, the granulator shaft seal system is a critical component to prevent material leakage and the entry of external contaminants. During the operation of a fly ash granulator, hard particles in the fly ash can cause severe abrasive wear on the shaft seal, leading to seal failure and increased leakage. Utility Model Content

[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of this section, the abstract and the title of this utility model. Such simplifications or omissions shall not be used to limit the scope of this utility model.

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution;

[0007] A shaft sealing system for a granulator includes a drive shaft and an end face plate, the drive shaft passing through the end face plate.

[0008] The end face plate is provided with a channel for the drive shaft to pass through, and the inner diameter of the channel is larger than the diameter of the drive shaft.

[0009] A PTFE packing sealing ring is provided between the end face plate and the drive shaft.

[0010] An annular ring is provided on the side of the channel, and the annular ring abuts against the end face of the sealing ring;

[0011] A clamping sleeve is provided on the other side of the end face plate, and the clamping sleeve abuts against the other end face of the sealing ring;

[0012] The clamping sleeve is provided with an extension plate, the diameter of which is larger than the diameter of the channel;

[0013] The end face plate is provided with at least three threaded blind holes on one side of the clamping sleeve, and the at least three threaded blind holes are arranged around the channel;

[0014] At least three bolts are arranged on the extended plate, and the bolts engage with threaded blind holes. The number of bolts and the number of threaded blind holes are the same and their positions correspond one-to-one.

[0015] The depth of the threaded blind hole is greater than the length of the bolt.

[0016] The above design first uses a PTFE packing ring as the shaft seal. PTFE packing is made of polytetrafluoroethylene fiber woven by a braiding machine. It has excellent corrosion resistance, good self-lubrication and anti-sticking properties, making it suitable for the high-wear conditions in granulators. Secondly, a clamping sleeve is set up. The clamping sleeve can be tightened with bolts to clamp the sealing ring, applying uniform pressure to the sealing ring and compensating for material stress relaxation caused by long-term use. Moreover, the depth of the threaded blind hole is greater than the length of the bolt, which can be adjusted during operation to compensate for gap changes caused by wear or thermal expansion of the sealing ring, preventing seal failure.

[0017] Preferably, each bolt is further fitted with two nuts, which are positioned between the extended plate and the end face plate. The bolt is also fitted with two spring washers: one between a nut and the extended plate, and the other between another nut and the extended plate. By using two nuts and two spring washers on the bolt, and tightening the extended plate and end face plate with a set of nuts and spring washers respectively, the two sets of nuts and spring washers maintain a fixed distance. The two nuts are pre-tightened and interlocked to prevent the bolt from loosening, reducing the impact and wear on the sealing ring caused by vibration during granulator operation. This significantly improves the vibration resistance and structural stability of the shaft sealing system.

[0018] Preferably, the drive shaft is provided with a detachable intermediate shaft, the length of which is greater than the length of the clamping sleeve and the length of the sealing ring. The detachable intermediate shaft facilitates the disassembly of the clamping sleeve and the sealing ring, saving sealing ring replacement time and reducing downtime and maintenance costs.

[0019] Preferably, intermediate connecting plates are provided at both ends of the intermediate shaft, and a drive connecting plate that mates with the intermediate connecting plates is provided on the drive shaft. A threaded mechanism connecting the intermediate connecting plates and the drive connecting plates is also provided, with at least six threaded mechanisms arranged on each connecting end face plate and the drive end face plate. The detachable intermediate shaft affects the transmission operation of the drive shaft; the connection between the intermediate connecting plates and the drive connecting plates via at least six threaded mechanisms ensures transmission stability.

[0020] Preferably, an intermediate sleeve is provided on one side of the end face plate, and the intermediate shaft is disposed in the inner cavity of the intermediate sleeve; a fixing connecting plate for fixing the intermediate sleeve is provided on the other end of the extended intermediate sleeve; at least 6 threaded through holes are arranged on the fixing connecting plate. By providing the intermediate sleeve, dust can be blocked when the fly ash granulator is working, and the end face plate can be fixed by the fixing connecting plate, improving the stability of the end face plate, thereby reducing the impact of vibration on the sealing ring and improving the vibration resistance and structural stability of the shaft sealing system.

[0021] Preferably, the length of the intermediate sleeve between the end face plate and the fixed connecting plate is greater than twice the length of the intermediate shaft; the minimum inner diameter of the intermediate sleeve is greater than twice the maximum diameter of the intermediate shaft. The intermediate sleeve provides sufficient space for the disassembly of the intermediate shaft.

[0022] Preferably, the side wall of the intermediate sleeve is provided with a maintenance window, through which the intermediate shaft, the clamping sleeve and the sealing ring can all pass.

[0023] The window is provided with at least two. The window allows workers to reach into the intermediate sleeve to operate and disassemble the intermediate shaft, clamping sleeve, and sealing ring.

[0024] Preferably, there is a gap of 0.8-1.2 mm between the annular ring and the drive shaft; the thickness of the sealing ring is 8-12 mm; and the length of the sealing ring is 35-45 mm. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments 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. Among them:

[0026] Figure 1 This is a cross-sectional structural schematic diagram of the shaft sealing system of this utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of the shaft sealing system of this utility model;

[0028] Figure 3 This is a schematic diagram of the external structure of the shaft sealing system of this utility model. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of this utility model more readily understood, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in less than one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0033] Example 1

[0034] refer to Figures 1-3 The granulator uses a shaft sealing system, which includes a drive shaft 1 and an end face plate 2, with the drive shaft 1 passing through the end face plate 2.

[0035] The end face plate 2 is provided with a channel for the drive shaft 1 to pass through, and the inner diameter of the channel is larger than the diameter of the drive shaft 1;

[0036] A PTFE packing sealing ring 3 is provided between the end face plate 2 and the drive shaft 1;

[0037] A ring 21 is provided on the side of the channel, and the ring 21 abuts against the end face of the sealing ring 3;

[0038] A clamping sleeve 4 is provided on the other side of the end face plate 2, and the clamping sleeve 4 abuts against the other end face of the sealing ring 3;

[0039] The clamping sleeve 4 is equipped with an extension plate, the diameter of which is larger than the diameter of the channel;

[0040] The end face plate 2 is provided with at least three threaded blind holes on one side of the clamping sleeve 4, and the at least three threaded blind holes are arranged around the channel;

[0041] At least three bolts 5 are arranged on the extended plate. The bolts 5 engage with the threaded blind holes. The number of bolts 5 and the threaded blind holes are the same and their positions correspond one-to-one.

[0042] The depth of the threaded blind hole is greater than the length of bolt 5.

[0043] The above design first uses a PTFE packing ring 3 as a shaft seal. PTFE packing is made of polytetrafluoroethylene fiber woven by a braiding machine. It has excellent corrosion resistance, good self-lubrication and anti-sticking properties, making it suitable for high-wear conditions in granulators. Secondly, a clamping sleeve 4 is set up. The clamping sleeve 4 can be tightened with bolts 5 to clamp the sealing ring 3, applying uniform pressure to the sealing ring 3 and compensating for material stress relaxation caused by long-term use. Moreover, the depth of the threaded blind hole is greater than the length of the bolts 5, which can be adjusted during operation to compensate for gap changes caused by wear or thermal expansion of the sealing ring 3, preventing seal failure.

[0044] Each bolt 5 is also fitted with two nuts 6, which are positioned between the extended plate and the end face plate 2. Each bolt 5 is also fitted with two spring washers: one between one nut 6 and the extended plate, and the other between the other nut 6 and the extended plate. By using two nuts 6 and two spring washers on the bolt 5, and tightening the extended plate and end face plate 2 with a set of nuts 6 and spring washers respectively, the two sets of nuts 6 and spring washers maintain a fixed distance. The two nuts 6 are pre-tightened and interlocked to prevent the bolt 5 from loosening, reducing the impact and wear on the sealing ring 3 due to vibration during granulator operation. This significantly improves the vibration resistance and structural stability of the shaft sealing system.

[0045] During use, the clamping sleeve 4 can be tightened with bolts 5 to clamp the sealing ring 3, applying uniform pressure to the sealing ring 3 and compensating for material stress relaxation caused by long-term use. Moreover, the depth of the threaded blind hole is greater than the length of bolts 5, and the gap changes caused by wear or thermal expansion of the sealing ring 3 can be compensated by adjusting the clamping bolts 5 during operation. The two nuts 6 are pre-tightened and interlocked to prevent bolts 5 from loosening, reducing the impact and wear of the sealing ring 3 on the granulator during operation, which can significantly improve the vibration resistance and structural stability of the shaft sealing system.

[0046] Example 2

[0047] refer to Figure 2 and Figure 3 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0048] The drive shaft 1 is equipped with a detachable intermediate shaft 11. The length of the intermediate shaft 11 is greater than the length of the clamping sleeve 4 and the length of the sealing ring 3. The detachable intermediate shaft 11 facilitates the disassembly of the clamping sleeve 4 and the sealing ring 3, saving the time required to replace the sealing ring 3 and reducing downtime and maintenance costs.

[0049] Intermediate connecting plates are provided at both ends of the intermediate shaft 11. A drive connecting plate that mates with the intermediate connecting plates is provided on the drive shaft 1. A threaded mechanism is also provided to connect the intermediate connecting plates and the drive connecting plates. At least six threaded mechanisms are arranged on each connecting end face plate 2 and the drive end face plate 2. The detachable intermediate shaft 11 affects the transmission operation of the drive shaft 1. The intermediate connecting plates and the drive connecting plates are connected by at least six threaded mechanisms to ensure the stability of the transmission.

[0050] An intermediate sleeve 22 is provided on one side of the end face plate 2, and an intermediate shaft 11 is disposed in the inner cavity of the intermediate sleeve 22. A fixing connecting plate for fixing the intermediate sleeve 22 is provided on the other end of the extended intermediate sleeve 22. At least 6 threaded through holes are arranged on the fixing connecting plate. By setting the intermediate sleeve 22, dust can be blocked when the fly ash granulator is working. The fixing connecting plate can fix the end face plate 2, improve the stability of the end face plate 2, thereby reducing the impact of vibration on the sealing ring 3 and improving the vibration resistance and structural stability of the shaft sealing system.

[0051] The length of the intermediate sleeve 22 between the end face plate 2 and the fixed connecting plate is greater than twice the length of the intermediate shaft 11; the minimum inner diameter of the intermediate sleeve 22 is greater than twice the maximum diameter of the intermediate shaft 11. The intermediate sleeve 22 provides sufficient space for the disassembly of the intermediate shaft 11.

[0052] The intermediate sleeve 22 has a maintenance window 23 on its side wall, through which the intermediate shaft 11, the clamping sleeve 4, and the sealing ring 3 can all pass. There are at least two windows 23. The windows 23 facilitate workers to reach into the intermediate sleeve 22 to operate and disassemble the intermediate shaft 11, the clamping sleeve 4, and the sealing ring 3.

[0053] The annular ring 21 has a gap of 0.8-1.2mm between it and the drive shaft 1; the seal ring 3 has a thickness of 8-12mm; and the seal ring 3 has a length of 35-45mm.

[0054] In use, the threaded mechanism of the intermediate shaft 11 can be loosened through window 23, the intermediate shaft 11 can be removed, and then the two nuts 6 on the clamping sleeve 4 can be loosened and the bolt 5 can be unscrewed. The intermediate shaft 11, clamping sleeve 4 and sealing ring 3 can all be removed and replaced through window 23, which facilitates the disassembly of the clamping sleeve 4 and sealing ring 3, saves the time of replacing the sealing ring 3, and reduces downtime and maintenance costs.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A seal system for a granulator comprising a drive shaft and an end face plate through which the drive shaft passes, characterised in that: The end face disc is provided with a channel for the driving shaft to pass through, and the inner diameter of the channel is greater than the diameter of the driving shaft; A sealing ring made of tetrafluoro disc material is arranged between the end face disc and the driving shaft; The side of the channel is provided with an annular ring, which abuts against the end face of the sealing ring; The other side of the end face disc is provided with a compression sleeve, which abuts against the other end face of the sealing ring; The compression sleeve is provided with an overhanging disc, and the diameter of the overhanging disc is greater than the diameter of the channel; The side of the end face disc provided with the compression sleeve is provided with at least three threaded blind holes arranged around the channel; At least three bolts are arranged on the overhanging disc, and the bolts are engaged with the threaded blind holes. The number of the bolts is consistent with the number of the threaded blind holes, and the positions of the bolts correspond to the positions of the threaded blind holes. The depth of the threaded blind hole is greater than the length of the bolt.

2. The seal system for a granulator as claimed in claim 1, wherein: Two nuts are further arranged on each bolt, and the two nuts are arranged between the overhanging disc and the end face disc; The bolt is further provided with two spring washers, one of which is arranged between one nut and the overhanging disc, and the other spring washer is arranged between the other nut and the overhanging disc.

3. The seal system for a granulator as claimed in claim 1, wherein: The driving shaft is provided with a detachable intermediate shaft, and the length of the intermediate shaft is greater than the length of the compression sleeve and the length of the sealing ring.

4. The seal system for a granulator as claimed in claim 3, wherein: Both ends of the intermediate shaft are provided with intermediate connecting discs, and the driving shaft is provided with driving connecting discs matched with the intermediate connecting discs. A threaded mechanism connecting the intermediate connecting discs and the driving connecting discs is further arranged, and at least six threaded mechanisms are arranged on each connected end face disc and driving end face disc.

5. The seal system for a granulator as set forth in claim 3, wherein: One side of the end face disc is provided with an intermediate sleeve, and the intermediate shaft is arranged in the inner cavity of the intermediate sleeve; The other end of the intermediate sleeve extending outward is provided with a fixed connecting disc for fixing the intermediate sleeve; At least six threaded through holes are arranged on the fixed connecting disc.

6. A seal system for a granulator as claimed in claim 5, characterised in that: The length of the intermediate sleeve between the end face disc and the fixed connecting disc is greater than twice the length of the intermediate shaft; The minimum inner diameter of the intermediate sleeve is greater than twice the maximum diameter of the intermediate shaft.

7. The seal system for a granulator as set forth in claim 5, wherein: The side wall of the intermediate sleeve is provided with a maintenance window, and the intermediate shaft, the compression sleeve and the sealing ring can pass through the window.

8. A seal system for a granulator as claimed in claim 7, characterised in that: The window is provided with at least two.

9. The seal system for a granulator as claimed in claim 1, wherein: The annular ring and the driving shaft have a gap of 0.8-1.2mm; The thickness of the sealing ring is 8-12mm; The length of the sealing ring is 35-45mm.

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