A bucket elevator drive shaft leak-proof device

Abstract

The utility model relates to transmission sealing structure technical field especially, relates to a bucket elevator transmission shaft anti -leak device. Including the casing and in the vertical transmission main shaft and auxiliary shaft in casing, the main shaft horizontal arrangement and both ends are equipped with main bearing, auxiliary shaft vertical arrangement and lower end are equipped with auxiliary bearing, and main bearing and auxiliary bearing are equipped with oil seal, and the outer ring of main bearing, auxiliary bearing is all equipped with the annular gasket, and the casing is equipped with the annular shoulder, and the gasket is embedded in the shoulder, and the gasket both ends are equipped with the opposite edge respectively, and two groups of edges are buckled on the shoulder end face and bearing outer ring respectively. With the bearing cooperation oil seal on the main shaft and auxiliary shaft as the first line of defense, and the gasket between the bearing outer ring and the casing shoulder, the second line of defense is constructed. Compared with the traditional single oil seal sealing, the sealing direction has more detailed processing, in addition to the sealing between the bearing and the shaft, the sealing of the bearing mounting part is also concerned, so that the sealing effect is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of transmission sealing structure technology, and in particular to a leak-proof device for the transmission shaft of a bucket elevator. Background Technology

[0002] Bucket elevators, as a highly efficient vertical conveying device, are widely used in various industries such as grain processing, mining, building materials, and chemicals. In the overall structure of a bucket elevator, the drive shaft is the core component that enables power transmission and ensures the normal operation of the equipment.

[0003] The drive shaft mainly consists of a main shaft and a secondary shaft. The main shaft is usually connected to an external power source (such as a motor) to input power into the equipment. The secondary shaft, driven by the main shaft, works with other components (such as an auger) to achieve the lifting action of materials. However, during the long-term operation of bucket elevators, the sealing problem of the drive shaft has always been a difficult problem that has plagued the industry. Currently, the sealing structures of drive shafts in common bucket elevators are relatively simple, mostly relying on a single oil seal. Because the drive shaft rotates at high speed during operation, and the working environment often contains large amounts of dust and impurities, and is also affected by factors such as vibration and temperature changes, existing sealing structures are prone to failure. On the one hand, external dust and impurities can easily enter the bearings of the drive shaft through the sealing gaps, leading to accelerated bearing wear, shortening bearing life, and in severe cases, even causing bearing seizure and equipment failure. On the other hand, the lubricating oil required for the drive shaft bearings will leak out through the sealing gaps, not only wasting lubricating oil and increasing production costs, but also polluting the surrounding working environment and potentially contaminating the conveyed materials, affecting product quality.

[0004] Therefore, developing a reliable sealing device for the transmission shaft of a bucket elevator with a long service life is of great practical significance for improving the operational stability of the bucket elevator and reducing the production costs of enterprises. Utility Model Content

[0005] The purpose of this utility model is to solve the problems existing in the prior art by proposing a leak prevention device for the drive shaft of a bucket elevator.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The anti-leakage device for the drive shaft of a bucket elevator includes a housing and a main shaft and a secondary shaft that drive vertically within the housing. The housing is equipped with an oil injection valve and an oil discharge valve. The main shaft is horizontally arranged and has main bearings at both ends. The secondary shaft is vertically arranged and has a secondary bearing at its lower end. Both the main bearings and the secondary bearings are equipped with oil seals. The outer rings of the main bearings and the secondary bearings are fitted with annular gaskets. The housing has annular shoulders, and the gaskets are embedded in the shoulders. The two ends of the gaskets are respectively provided with fastening edges facing opposite directions. The two sets of fastening edges are respectively fastened to the end face of the shoulders and the outer ring of the bearings.

[0007] Preferably, the housing includes a front housing and an outer housing, which are connected by bolts and are internally connected. The secondary shaft and its matching secondary bearing are located in the rear housing, and the lower end of the rear housing is provided with an output hole for the lower end of the secondary shaft to extend out. The main shaft and the main bearing at the end away from the secondary shaft are located in the front housing, and the main bearing at the end near the secondary shaft are located in the rear housing. The front housing at the end opposite to the rear housing is provided with an input hole for the main shaft to extend out.

[0008] Preferably, a sealing plate is detachably installed on one end of the front shell away from the rear shell. The center of the sealing plate is a cylindrical shape coaxial with the main shaft, and a sealing ring is fixedly installed on the end face of the cylindrical part of the sealing plate.

[0009] Preferably, the inner wall of the cylindrical part of the sealing plate is provided with internal threads, and a sleeve is screwed on by the threads. The sleeve is sleeved on the main shaft, and the end of the sleeve extends to the side wall of the sealing end.

[0010] Preferably, a sealing ring is detachably installed at the output hole, and the inner ring of the sealing ring has a groove that abuts against the outer ring of the secondary bearing.

[0011] Preferably, the outer wall of the output hole of the secondary shaft is provided with an external thread, and a lock nut is screwed on by the thread. The upper end of the lock nut abuts against a bearing cover. The inner ring of the bearing cover abuts against the inner ring of the secondary shaft layer, and the outer ring abuts against the lower end face of the sealing ring.

[0012] Preferably, the oil injection valve includes an oil injection pipe disposed at the upper end of the front housing, the oil injection pipe port is detachably fitted with a cover plate, and a filter screen is snapped into the oil injection pipe.

[0013] Preferably, the drain valve includes a drain pipe and a plug threaded into the drain pipe. The drain pipe is inserted obliquely upward from the side of the rear housing, and one end inserted into the rear housing is located above the secondary bearing.

[0014] Preferably, the main shaft and the secondary shaft are respectively provided with a main bevel gear and a secondary bevel gear at opposite ends, and the main bevel gear meshes with the secondary bevel gear.

[0015] Preferably, the inner side of the shoulder that mates with the gasket away from the secondary shaft is provided with a protruding ring, and the lower edge of the gasket abuts against the protruding ring.

[0016] Compared with the prior art, this utility model provides a leakage prevention device for the drive shaft of a bucket elevator, which has the following beneficial effects: 1. This utility model achieves concealed sealing using bearings on the main shaft and auxiliary shaft, in conjunction with an oil seal as the first line of defense. A gasket with double-locking edges, positioned between the bearing outer ring and the housing shoulder, forms the second line of defense. Compared to traditional single oil seal sealing, this design offers more detailed treatment in the sealing direction, addressing not only the seal between the bearing and the shaft but also the seal at the bearing mounting location, thus enhancing the sealing effect.

[0017] 2. In this utility model, a sealing plate is detachably installed on one end of the front shell away from the rear shell. The center of the sealing plate is a cylindrical shape coaxial with the main shaft, and a sealing ring is fixedly installed on the end face of the cylindrical part of the sealing plate. The sealing ring and the left main bearing form a tighter sealing space, effectively preventing media leakage.

[0018] Other advantages, objectives and features of this invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be taught from practice of this invention. Attached Figure Description

[0019] Figure 1 This is a three-dimensional illustration of the present invention. Figure 1 .

[0020] Figure 2 This is a three-dimensional illustration of the present invention. Figure 2 .

[0021] Figure 3 This is a three-dimensional illustration of the present invention. Figure 3 .

[0022] Figure 4 This is a three-dimensional illustration of the present invention. Figure 4 .

[0023] Figure 5 This is a front view schematic diagram of the present invention.

[0024] Figure 6 This is a left-side view of the present invention.

[0025] Figure 7 This is a cross-sectional schematic diagram of the present invention.

[0026] Figure 8 For the present utility model Figure 7 Schematic diagram of the assembly and meshing of the main shaft and the secondary shaft.

[0027] Figure 9 For the present utility model Figure 8Assembly diagram of the left side of the central spindle.

[0028] Figure 10 This is a three-dimensional schematic diagram of the assembly and meshing of the main shaft and the secondary shaft of this utility model.

[0029] Figure 11 This is a three-dimensional schematic diagram of the front and rear shells of this utility model after they have been separated.

[0030] In the diagram: 101, front housing; 102, rear housing; 103, main shaft; 104, main bevel gear; 105, secondary shaft; 106, secondary bevel gear; 107, worm gear; 108, auxiliary shaft; 109, worm wheel; 110, limiting ring; 201, main bearing; 202, oil seal; 203, gasket; 204, secondary bearing; 205, sealing plate; 206, sealing ring; 207, sleeve; 208, mounting plate; 209, adapter; 210, oil injection pipe; 211, cover plate; 212, filter screen; 213, drain pipe; 301, sealing ring. Detailed Implementation

[0031] The following will refer to the appendix in the embodiments of this utility model. Figure 1-11 The technical solutions in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0032] Example 1: In order to effectively solve the problem of sealing the drive shaft of a bucket elevator, this example provides a leak-proof device for the drive shaft of a bucket elevator, including a housing and a main shaft 103 and a secondary shaft 105 that drive vertically within the housing.

[0033] The housing serves as the mounting base and protective enclosure for the entire device, forming a sealed space inside to house the main shaft 103, the countershaft 105, and related transmission components. The housing is equipped with an oil injection valve and an oil discharge valve, used for injecting lubricating oil into the housing and discharging lubricating oil outwards, respectively.

[0034] The main shaft 103 is horizontally positioned, and the secondary shaft 105 is vertically positioned. The end of the main shaft 103 opposite to the secondary shaft 105 extends out of the housing, and the lower end of the secondary shaft 105 extends out of the housing, serving as the power input and output connection ends. A main bevel gear 104 and a secondary bevel gear 106 are respectively installed at opposite ends of the main shaft 103 and secondary shaft 105. The main bevel gear 104 and secondary bevel gear 106 mesh, serving as the connection structure for vertical power transmission between the main shaft 103 and secondary shaft 105. Main bearings 201 are installed at both ends of the main shaft 103, and a secondary bearing 204 is also installed at the end of the secondary shaft 105. The main bearing 201 on the left side is fitted inside the left end of the housing and sleeved on the main shaft 103; similarly, the secondary bearing 204 at the lower end is fitted inside the lower right end of the housing and sleeved on the secondary shaft 105. This not only supports the rotation of the main shaft 103 and secondary shaft 105, providing a base surface for subsequent sealing, but also achieves a concealed seal through the bearing structure.

[0035] Both the main bearing 201 and the auxiliary bearing 204 are equipped with oil seals 202. As a contact seal, the oil seal 202 is a dynamic seal, which includes a sealing rubber that performs the sealing function, a metal skeleton located inside the sealing rubber to provide support and positioning, and a spring that is clamped on the main lip of the sealing rubber. Its main function is to prevent the leakage of lubricating medium and the entry of external dust into the sealing working area at the surface level, and it is the first line of defense for sealing.

[0036] Both the main bearing 201 and the auxiliary bearing 204 have annular gaskets 203 fitted around their outer rings. The gaskets 203 are made of stainless steel with an anti-corrosion treatment, providing high strength and sealing performance. Annular shoulders are provided inside the housing corresponding to the bearing mounting positions. These shoulders are integrally formed with the housing, ensuring structural stability. The gaskets 203 are embedded within the shoulders, and each end face of the gasket 203 has oppositely facing fastening edges. These two sets of fastening edges fasten onto the shoulder end face and the bearing outer ring, respectively. Through the double fastening action of the fastening edges, a gapless sealing connection is formed between the gasket 203, the shoulder, and the bearing outer ring, further preventing lubricating medium from leaking through the gap between the bearing and the housing, while simultaneously completely isolating external impurities from entering the housing.

[0037] According to the above technical solution, the bearings on the main shaft 103 and the auxiliary shaft 105 achieve concealed sealing, in conjunction with the oil seal 202 as the first line of defense. The gasket 203 with double-locking edges, positioned between the outer ring of the bearing and the housing shoulder, constitutes the second line of defense. Compared to the traditional single oil seal 202 seal, this solution offers more detailed treatment in the sealing direction, addressing not only the seal between the bearing and the shaft but also the seal at the bearing mounting location, thus enhancing the sealing effect.

[0038] In Example 2, to facilitate the installation of the main shaft 103, the auxiliary shaft 105, and the matching bearings, the housing is divided into a front housing 101 and an outer housing. The right end of the front housing 101 and the left end of the rear housing 102 are both fully open, forming a through space after assembly. The mating surfaces of the front housing 101 and the rear housing 102 extend outward to form a ring platform, serving as the assembly base for bolts and nuts, thus achieving assembly locking of the front housing 101 and the rear housing 102. Furthermore, the mating surfaces of the front housing 101 and the rear housing 102 have a tenon-and-mortise joint structure, which, together with a sealing gasket, forms a sealed contact surface to prevent leakage of lubricating medium.

[0039] The secondary shaft 105 is housed within the rear housing 102, and the lower end of the rear housing 102 has an output hole for the lower end of the secondary shaft 105 to extend out. The matching secondary bearing 204 is housed within the output hole. The left side of the main shaft 103 and the left-side main bearing 201 are housed within the front housing 101, and the main bearing 201 near the end of the secondary shaft 105 is housed within the rear housing 102. The left end of the front housing 101 has an input hole for the main shaft 103 to extend out, and the left-side main bearing 201 is housed within the input hole.

[0040] The device adopts a split design with a front shell 101 and a rear shell 102, which are connected by bolts. This makes it easy to install the main shaft 103, the auxiliary shaft 105 and related components separately during device assembly, reducing the difficulty of installation.

[0041] This design also serves another purpose: the oil injection valve is located at the upper end of the front housing 101, and the oil discharge valve is located on the side wall of the rear housing 102. During assembly, the auxiliary shaft 105 and its matching auxiliary bearing 204 are first installed in the rear housing 102 and its output hole, and the corresponding gasket 203 is also installed to seal the output hole of the rear housing 102. Then, the rear housing 102 is laid flat with its open end facing upwards, and lubricating medium is injected. After that, the main shaft 103 and the right main bearing 201 are installed inside the rear housing 102. Then, the left main bearing 201 is assembled on the left side of the main shaft 103. Finally, the main shaft 103 and the left main bearing 201 are installed in the front housing 101 with the gasket 203 to achieve the docking of the front housing 101 and the rear housing 102, and locked with bolts. After the front housing 101 and the rear housing 102 are assembled, lubricating medium is added to the front housing 101 through the oil injection valve. When draining oil, the bolts of the front housing 101 are loosened to create a gap at the connection between the front housing 101 and the rear housing 102 for draining; while the rear housing 102 drains oil directly through the drain valve.

[0042] However, the above products are somewhat inconvenient in terms of draining and assembly. Therefore, an oil injection valve and a drain valve can be installed on the front shell 101 and the rear shell 102 respectively. This way, the components can be assembled first, and then oil can be injected through the oil injection valve, or the oil can be drained through the drain valve, which would be more convenient.

[0043] The oil injection valve includes an oil injection pipe 210 located at the upper end of the front housing 101. A cover plate 211 is detachably installed at the port of the oil injection pipe 210 via bolts. A filter screen 212 is snapped into the oil injection pipe 210, and a pressure post is provided inside the cover plate 211 to press against the port of the filter screen 212. Lubricant is added through the oil injection pipe 210, and the cover plate 211 closes the valve. The filter screen 212 is made of woven stainless steel wire, which effectively filters impurities in the lubricating oil, preventing impurities from entering the housing and causing accelerated wear of the transmission parts.

[0044] The oil drain valve includes an oil drain pipe with internal threads on the inner wall of the oil outlet. A plug is screwed onto the threaded outlet. The oil drain pipe is inserted obliquely upward from the side of the rear housing 102, and the oil inlet at the end inserted into the rear housing 102 is located above the secondary bearing 204. After opening the plug, waste lubricating oil is drained by gravity.

[0045] Example 3 optimizes the sealing structure at the left side of the main spindle 103 and the left side of the input hole of the front housing 101: A sealing plate 205 is installed at the end of the front housing 101 opposite to the rear housing 102. The sealing plate 205 is fastened to the left end face of the front housing 101 with bolts for locking. The center of the sealing plate 205 is cylindrical, and this cylindrical part is coaxial with the main spindle 103. The inner diameter of the cylindrical part is smaller than the diameter of the main spindle 103 at that location, creating a gap to ensure that the main spindle 103 can rotate smoothly within the cylindrical part. A sealing ring 206 is fixedly installed on the end face of the cylindrical part of the sealing plate 205. The sealing ring 206 is made of fluororubber, which has good high temperature resistance, oil resistance, and corrosion resistance. The sealing ring 206 is annular, and its end extends beyond the cylindrical part of the sealing plate 205 and abuts against the left side wall of the inner ring of the left main bearing 201. In this way, the sealing ring 206 and the left main bearing 201 form a tighter sealing space, effectively preventing media leakage.

[0046] Furthermore, the inner wall of the cylindrical portion of the sealing plate 205 is provided with internal threads, and a sleeve 207 is screwed onto it. The sleeve 207 is fitted onto the main shaft 103, with its end extending to the side wall of the sealing end. The sleeve 207 not only provides some protection for the main shaft 103 but also further enhances the sealing effect of the sealing ring 206 structure, preventing media leakage from the connection between the main shaft 103 and the sealing plate 205. The inside of the sleeve 207 is coated with grease to ensure that its connection with the main shaft 103 does not affect the normal rotation of the main shaft 103.

[0047] Example 4 optimizes the sealing structure at the lower end of the auxiliary shaft 105 and the lower rear output hole: a sealing ring 301 is provided at the output hole, the periphery of which is a flange structure, and it can be detachably installed at the output hole of the rear housing 102 by bolts. The inner ring of the sealing ring 301 has a groove, and the lower end of the outer ring of the auxiliary bearing 204 is engaged in the groove. The core function of the sealing ring 301 is to provide support for the outer ring of the auxiliary bearing 204. The groove, together with the gasket 203, has double-sided fastening edges to limit the position of the auxiliary bearing 204, so as to prevent the auxiliary bearing 204 from shifting due to vibration during equipment operation.

[0048] The outer wall of the secondary shaft 105 extending from the output hole is provided with external threads, and a lock nut is screwed on by the threads. The upper end of the lock nut abuts against a bearing cover. The inner ring of the bearing cover abuts against the inner ring of the secondary shaft 105, and the outer ring abuts against the lower end face of the sealing ring 301. The bearing cover is also an embedded oil seal 202 structure, which is used to form an additional sealing barrier from the outside, to isolate the secondary bearing 204, and prevent dust and impurities from penetrating into the secondary bearing 204.

[0049] In Example 5, to improve the installation stability of the left main bearing 201, a raised ring is provided on the rearward side of the left end shoulder of the front housing 101, and the raised ring is integrally formed with the front housing 101. The lower edge of the gasket 203 abuts against the raised ring. This achieves the positioning of the left main bearing 201.

[0050] In Example 6, a through hole is provided at the right end of the rear housing 102, and a mounting plate 208 is installed at the through hole by bolts. An adapter 209 is provided at the center of the mounting plate 208, and the end of the adapter 209 is inserted into the interior of the rear housing 102. The adapter 209 can be used to connect sensors and other detection equipment to facilitate real-time monitoring of the internal working status of the rear housing 102, such as parameters like temperature and pressure, so as to promptly detect potential leakage problems.

[0051] Example 7 optimizes the transmission structure of the drive shaft: it includes a worm gear 107 mounted on the main shaft 103, an auxiliary shaft 108 rotatably mounted on the lower side of the front housing 101, and a worm wheel 109 mounted on the auxiliary shaft 108, which meshes with the worm gear 107. The auxiliary shaft 108 is also mounted via bearings, and its sealing conditions are the same as those of the main shaft 103. When the main shaft 103 rotates, the worm gear 107 rotates accordingly. Through the meshing of the worm gear 107 and the worm, the auxiliary shaft 108 is driven to rotate, achieving additional power output to meet the working requirements of different parts of the bucket elevator.

[0052] The spindle 103 is equipped with a spline, while the inner wall of the worm gear 107 has a spline groove. The power transmission between the worm gear 107 and the spindle 103 is achieved through the engagement of the spline and the spline groove. A limiting ring 110 is located on the right side of the spline on the spindle 103, preventing the worm gear 107 from moving to the right of the spline. The left side of the worm gear 107 abuts against the inner ring of the left main bearing 201. This design not only achieves the limiting assembly of the worm gear 107 but also, through its engagement with the washer 203 and the retainer, achieves the limiting and locking of the left main bearing 201. This eliminates the need for a retaining ring or a retaining ring groove, making machining more convenient.

[0053] Similarly, the right side of the main shaft 103 (located to the left of the right main bearing 201) is provided with an external thread, and a self-locking nut is screwed onto the external thread. The self-locking nut abuts against the inner ring of the right main bearing 201, thereby limiting the right main bearing 201.

[0054] In summary, the drive shaft assembly, through the meshing of the main bevel gear 104 and the secondary bevel gear 106, and the meshing of the worm gear 107 and the worm wheel 109, achieves efficient power transmission in different directions, meeting the complex working requirements of the bucket elevator and improving its working efficiency. The leak-proof assembly employs multiple sealing structures, such as oil seal 202, gasket 203, sealing ring 206, and sleeve 207, forming a multi-layered sealing protection that effectively prevents leakage of media such as lubricating oil, reduces media waste, and avoids pollution to the working environment caused by media leakage. The sensor mounting plate 208 and adapter 209 facilitate real-time monitoring of the internal working status of the rear housing 102, enabling timely detection of potential leakage problems and facilitating early maintenance and repair. The design of the oil injection pipe 210 and drain pipe 213 facilitates the injection and discharge of lubricating oil, while the use of the filter screen 212 ensures the cleanliness of the lubricating oil, extends the service life of the equipment, and reduces maintenance costs.

[0055] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A leak-proof device for the drive shaft of a bucket elevator, comprising a housing and a main shaft (103) and a secondary shaft (105) for vertical transmission within the housing, wherein the housing is equipped with an oil injection valve and an oil discharge valve, characterized in that, The main shaft (103) is horizontally arranged and has main bearings (201) at both ends. The auxiliary shaft (105) is vertically arranged and has auxiliary bearings (204) at the lower end. Both the main bearings (201) and the auxiliary bearings (204) are equipped with oil seals (202). The outer rings of the main bearings (201) and the auxiliary bearings (204) are fitted with annular gaskets (203). The housing is provided with annular shoulders. The gaskets (203) are embedded in the shoulders. The two ends of the gaskets (203) are respectively provided with fastening edges facing opposite directions. The two sets of fastening edges are respectively fastened to the end face of the shoulders and the outer ring of the bearings.

2. The anti-leakage device for the drive shaft of a bucket elevator according to claim 1, characterized in that, The housing includes a front housing (101) and an outer housing. The front housing (101) and the outer housing are connected by bolts and are internally connected. The sub-shaft (105) and the matching sub-bearing (204) are located in the rear housing (102). The lower end of the rear housing (102) is provided with an output hole for the lower end of the sub-shaft (105) to extend out. The main shaft (103) and the main bearing (201) at the end away from the sub-shaft (105) are located in the front housing (101). The main bearing (201) at the end near the sub-shaft (105) is located in the rear housing (102). The front housing (101) at the end away from the rear housing (102) is provided with an input hole for the main shaft (103) to extend out.

3. The anti-leakage device for the drive shaft of a bucket elevator according to claim 2, characterized in that, A sealing plate (205) is detachably installed on one end of the front shell (101) away from the rear shell (102). The center of the sealing plate (205) is a cylindrical shape coaxial with the main shaft (103). A sealing ring (206) is fixedly installed on the end face of the cylindrical part of the sealing plate (205).

4. The anti-leakage device for the drive shaft of a bucket elevator according to claim 3, characterized in that, The inner wall of the cylindrical part of the sealing plate (205) is provided with internal threads, and a sleeve (207) is screwed on by the threads. The sleeve (207) is sleeved on the main shaft (103), and the end of the sleeve (207) extends to the side wall of the sealing end.

5. The anti-leakage device for the drive shaft of a bucket elevator according to claim 2, characterized in that, A sealing ring (301) can be detachably installed at the output hole. The inner ring of the sealing ring (301) has a groove that abuts against the outer ring of the secondary bearing (204).

6. The anti-leakage device for the drive shaft of a bucket elevator according to claim 5, characterized in that, The outer wall of the sub-shaft (105) extending out of the output hole is provided with an external thread, and a lock nut is screwed on by the thread. The upper end of the lock nut abuts against a bearing cover. The inner ring of the bearing cover abuts against the inner ring of the sub-shaft (105) layer, and the outer ring abuts against the lower end face of the sealing ring (301).

7. The anti-leakage device for the drive shaft of a bucket elevator according to claim 2, characterized in that, The oil injection valve includes an oil injection pipe (210) located at the upper end of the front housing (101), a cover plate (211) is detachably installed at the port of the oil injection pipe (210), and a filter screen (212) is snapped into the oil injection pipe (210).

8. The anti-leakage device for the drive shaft of a bucket elevator according to claim 2, characterized in that, The drain valve includes a drain pipe and a plug screwed into the drain pipe. The drain pipe is inserted obliquely upward from the side of the rear housing (102), and one end inserted into the rear housing (102) is located above the secondary bearing (204).

9. The anti-leakage device for the drive shaft of a bucket elevator according to claim 2, characterized in that, The main shaft (103) and the secondary shaft (105) are respectively provided with a main bevel gear (104) and a secondary bevel gear (106) at opposite ends, and the main bevel gear (104) meshes with the secondary bevel gear (106).

10. The anti-leakage device for the drive shaft of a bucket elevator according to claim 1, characterized in that, The inner side of the shoulder is provided with a convex ring that mates with the gasket (203) which is far from the secondary shaft (105), and the lower edge of the gasket (203) abuts against the convex ring.

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