Bearing lubricating device, compost stirring device and aerobic composting device

Abstract

The utility model relates to the technical field of bearing lubrication, in particular to a bearing lubrication device, a compost stirring device and an aerobic composting device, and the bearing lubrication device comprises a protective shell and a hollow shaft with an axial channel in the middle. The device is reasonable and compact in structure and convenient to use, the lubricating state of the bearing can be judged according to the pressure change in the oil storage cavity, when the oil storage cavity is lack of lubricating grease, the lubricating grease is automatically supplemented and injected into the oil storage cavity through the oil gun and the oil filling pipe installed in the hollow shaft, and it is ensured that the bearing at the lower end of the stirring device can be fully lubricated all the time; good lubricating performance is kept, the abrasion of the bearing is reduced, the service life of the bearing is prolonged, the failure rate of the bearing is reduced, the replacement frequency of the bearing is reduced, and the operation continuity of the aerobic composting device is prevented from being influenced. The oil gun is positioned outside the aerobic composting device, so that operators can conveniently operate the oil gun in emergency or supplement lubricating grease for the oil gun, and the lubricating operation difficulty of the bearing at the lower end of the stirring device is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing lubrication, and relates to a bearing lubrication device, a compost stirring device and an aerobic composting device. Background Art

[0002] Aerobic composting involves mixing microbial inoculants with straw, feces, crushed and dehydrated food waste, and pulverized litter to form a volume of material. Under sufficient oxygen, a large number of microorganisms rapidly degrade the organic matter and bioresidues in the material, generating carbon dioxide, water, and bioheat, ultimately creating a humus-rich organic fertilizer. The aerobic composting cycle lasts approximately 25 to 30 days.

[0003] Existing medium-to-large-scale automated aerobic composting devices have a relatively large structure. Among them, aerobic composting devices used for kitchen waste treatment can be up to 18 meters in length, about 3.2 meters in width, and about 3 meters in depth. Their composting reactors are usually implemented through a concrete base. The concrete base is a semi-sedimentation tank structure with concrete cast into a cavity. One end of the concrete base is provided with a feed port and the other end is provided with a discharge port, which are used for the entry and exit of materials respectively. A propulsion rack and at least one set of stirring devices are installed in the sedimentation tank. During each composting cycle, the propulsion rack can push the material from the feed port to the discharge port. The lower end of the stirring device is mounted on the bottom of the concrete base via a bearing. During the material pushing process, the stirring device is activated to stir the material evenly so that the material can be fully degraded.

[0004] Chinese patent publication CN208846060U discloses a hollow shaft-based lubrication structure, comprising a frame, a lower bearing seat, an adjusting bolt, and a rolling bearing. A backing plate is welded to the front of the frame, and a first fixed bearing seat is screwed to the upper front of the frame. A hollow shaft is mounted in the middle of the first fixed bearing seat, and a second bearing seat is screwed to the upper backing plate. Fixed rubber blocks are mounted on the front and rear sides of the fixed tube. The lower bearing seat is located at the upper rear of the frame, and a lubrication point is provided in the middle of the rear of the upper bearing seat. The adjusting bolt is located above the second bearing seat. A grease pump is connected to the right side of the oil pipe, and the rolling bearing is located on the front and rear sides of the hollow shaft. This hollow shaft-based lubrication structure includes a fixed pipe, which saves space. By integrating the lubrication line into the hollow portion of the main shaft, this prevents the oil pipes from becoming entangled during operation, reducing equipment failure rates and improving production efficiency.

[0005] Once an aerobic composting system begins operation, it typically operates year-round, making it difficult to inspect and maintain components that are difficult to disassemble and install. The bearings at the bottom of the agitator, in particular, become submerged in the material during operation, making lubricant replenishment difficult. These bearings are subject to significant pressure and are susceptible to wear if lubrication is insufficient or ineffective. Once a failure occurs due to excessive wear, the system must be shut down and the material inside the concrete base completely removed before replacement and maintenance can be performed, severely impacting the composting system's performance. Summary of the Invention

[0006] The utility model provides a bearing lubricating device, a compost stirring device and an aerobic composting device, which overcome the deficiencies of the above-mentioned prior art and can effectively solve the problem that the bearing at the lower end of the stirring device of the existing aerobic composting device will be submerged by the bottom of the material during operation, making it difficult to replenish lubricant.

[0007] One of the technical solutions of the present utility model is achieved through the following measures: a bearing lubricating device, comprising a protective shell and a hollow shaft with an axial channel in the middle, the opening of the protective shell is upward, the lower end of the hollow shaft is installed in the protective shell through a bearing, and the lower end of the bearing is abutted against the corresponding position on the inner side of the bottom of the protective shell; a bearing pressure cover with an opening downward and a middle part sleeved on the outer side of the hollow shaft is fixedly installed on the upper end of the protective shell, and a sealing member is provided between the bearing pressure cover and the hollow shaft; an oil groove with an opening upward is provided on the inner side of the middle part of the bottom end of the protective shell, and the opening size of the oil groove is slightly larger than the inner diameter size of the outer ring of the bearing; an annular baffle is fixedly installed on the inner side of the lower end of the hollow shaft, and the lower side of the annular baffle, the inner side of the lower end of the hollow shaft, the lower end surface of the bearing and the inner side of the oil groove can form an oil storage chamber; a hollow refueling pipe is fixedly installed on the inner side of the annular baffle, the upper end of the refueling pipe is located above the hollow shaft, and the upper end of the refueling pipe is connected to a refueling gun that can automatically replenish grease according to the pressure change of the oil storage chamber.

[0008] The following is a further optimization and / or improvement of one of the above-mentioned utility model technical solutions:

[0009] The above-mentioned refueling gun may include a sealing piston, a piston rod, a compression spring, a gun body and a refueling gun end cover with an opening downward. The opening of the gun body is upward, and an oil outlet that passes through the inside and outside is provided in the middle of the bottom end of the gun body, and the inner side of the oil outlet is installed together with the outer side of the refueling pipe; a sealing piston is provided in the gun body, and a piston rod with an upper end located above the gun body is fixedly installed in the middle of the upper side of the sealing piston; an refueling gun end cover with a middle part that is sleeved on the outside of the piston rod is installed on the outer side of the upper end of the gun body, and a compression spring is provided in the gun body corresponding to the position between the inner side of the top end of the refueling gun end cover and the upper side of the sealing piston, and the compression spring is sleeved on the outside of the piston rod.

[0010] A pull ring may be fixedly mounted on the upper end of the piston rod.

[0011] A scale may be provided on the outside of the piston rod.

[0012] A protective end cover with a downward opening can be fixedly installed on the outer side of the hollow shaft corresponding to the upper side of the bearing cover. The upper end of the bearing cover can be inserted into the protective end cover, and a gap can be left between the outer side of the upper end of the bearing cover and the inner side of the protective cover.

[0013] A retaining ring groove may be provided on the outer side of the hollow shaft corresponding to the lower side of the bearing, and a retaining ring with its upper end abutting against the lower side of the bearing inner ring may be installed in the retaining ring groove.

[0014] The oil groove may include a first groove and a second groove whose opening sizes decrease from top to bottom. The opening size of the second groove is slightly larger than the outer diameter of the retaining spring, and the bottom of the first groove is located at the lower side of the retaining spring.

[0015] An outer ring groove may be provided on the outer side of the lower end of the hollow shaft, the bearing may be fixedly mounted in the outer ring groove, and the upper end surface of the bearing inner ring may abut against the upper groove wall of the outer ring groove.

[0016] The sealing member may be an oil seal.

[0017] An annular seal can be installed on the inner side of the upper end of the hollow shaft, the middle part of which is sleeved on the outer side of the refueling pipe.

[0018] The outer side of the upper end of the above-mentioned protective shell may have a first outer flange, and a plurality of first mounting holes that pass through the upper and lower parts may be evenly distributed along the circumference on the first outer flange. The outer side of the lower end of the bearing cover may have a second outer flange, and a second mounting hole that passes through the upper and lower parts may be provided on the second outer flange corresponding to each first mounting hole position. Each second mounting hole may be provided with an anchor bolt with the middle part located in the corresponding first mounting hole. The outer side of the upper end of the anchor bolt may be connected with a fastening nut through a thread, and the lower end of the fastening nut is against the corresponding position on the upper side of the bearing cover.

[0019] An outer ring platform may be provided on the outer side of the lower end of the above-mentioned bearing cover, and a number of vertically penetrating connection holes may be evenly distributed on the outer ring platform along the circumference. A threaded hole opening upward may be provided on the upper end surface of the shell corresponding to the position of each connection hole, and each threaded hole may be provided with a fastening bolt with the upper part located in the corresponding connection hole.

[0020] The second technical solution of the present invention is achieved through the following measures: a compost stirring device includes the bearing lubrication device as described above.

[0021] The third technical solution of the present invention is achieved through the following measures: an aerobic composting device, including the compost stirring device as described above.

[0022] The utility model has a reasonable and compact structure and is easy to use. It can judge the lubrication status of the bearing based on the pressure change in the oil storage chamber. When the oil storage chamber lacks grease, grease is automatically added to the oil storage chamber through the refueling gun and the refueling pipe installed in the hollow shaft, ensuring that the bearing at the lower end of the stirring device is always fully lubricated, maintaining good lubrication performance, reducing bearing wear, extending the service life of the bearing, reducing the failure rate of the bearing, reducing the number of bearing replacements, and avoiding affecting the continuity of the operation of the aerobic composting device. The refueling gun is located outside the aerobic composting device, which is more convenient for operators to manually operate the refueling gun in an emergency or to refill the refueling gun with grease, effectively reducing the difficulty of lubricating the bearing at the lower end of the stirring device, improving lubrication efficiency, effectively extending the maintenance cycle of the device, reducing the failure rate of equipment operation, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Attachment Figure 1 This is a schematic diagram of the main cross-sectional structure of Example 1 of the present utility model.

[0024] The codes in the accompanying drawings are: 1 for the protective shell, 2 for the axial channel, 3 for the hollow shaft, 4 for the bearing, 5 for the bearing cover, 6 for the seal, 7 for the annular baffle, 8 for the oil storage chamber, 9 for the refueling pipe, 10 for the sealing piston, 11 for the piston rod, 12 for the compression spring, 13 for the gun body, 14 for the oil gun end cover, 15 for the pull ring, 16 for the scale, 17 for the protective end cover, 18 for the gap, 19 for the retaining ring, 20 for the first groove, 21 for the second groove, 22 for the outer ring groove, 23 for the annular seal, 24 for the first outer flange, 25 for the second outer flange, 26 for the anchor bolt, 27 for the fastening nut, 28 for the lubricant, and 29 for the concrete foundation seat. DETAILED DESCRIPTION

[0025] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0026] In this utility model, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 For example, the positional relationships of front, back, up, down, left, and right are determined according to the layout directions of the drawings in the specification.

[0027] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0028] Example 1: As shown in the attached Figure 1As shown, the bearing lubrication device includes a protective shell 1 and a hollow shaft 3 with an axial channel 2 in the middle. The opening of the protective shell 1 is upward, and the lower end of the hollow shaft 3 is installed in the protective shell 1 through a bearing 4, and the lower end of the bearing 4 is abutted against the corresponding position on the inner side of the bottom of the protective shell 1; a bearing pressure cover 5 with an opening downward and a middle part sleeved on the outer side of the hollow shaft 3 is fixedly installed on the upper end of the protective shell 1, and a seal 6 is provided between the bearing pressure cover 5 and the hollow shaft 3; an oil groove with an upward opening is provided on the inner side of the middle part of the bottom end of the protective shell 1, and the opening size of the oil groove is slightly larger than the inner diameter size of the outer ring of the bearing 4; an annular baffle 7 is fixedly installed on the inner side of the lower end of the hollow shaft 3, and the lower side of the annular baffle 7, the inner side of the lower end of the hollow shaft 3, the lower end surface of the bearing 4 and the inner side of the oil groove can form an oil storage chamber 8; a hollow refueling pipe 9 is fixedly installed on the inner side of the annular baffle 7, the upper end of the refueling pipe 9 is located above the hollow shaft 3, and the upper end of the refueling pipe 9 is connected to a refueling gun that can automatically replenish grease according to the pressure change of the oil storage chamber 8.

[0029] In the above technical solution, when pouring the concrete foundation 29, the protective shell 1 can be pre-planted at a predetermined position at the bottom of the concrete foundation 29 according to the design requirements, and the protective shell 1 can be fixed by concrete. The protective shell 1 can provide support for the hollow shaft 3 and the bearing 4; if the protective shell 1 and the bearing cover 5 are connected and fixed by threaded fasteners, the upper end surface of the protective shell 1 can be flush with the bottom inner side surface of the concrete foundation 29 or slightly protrude from the bottom of the concrete foundation 29; if the protective shell 1 and the bearing cover 5 are fixed by threaded connection, the upper end of the protective shell 1 needs to be higher than the bottom of the concrete foundation 29, and installation space is reserved for the threaded connection.

[0030] The bearing 4 can be compressed and fixedly installed in the protective shell 1 through the bearing cover 5. The bearing cover 5 with the downward opening and the protective shell 1 with the upward opening can form a relatively sealed bearing 4 installation cavity. The bearing cover 5 and the protective shell 1 can be fixedly installed by threaded fasteners in the prior art; the two can also be connected by threads, but it is necessary to provide a wrench hole or install a wrench rod on the outer side of the middle part of the bearing cover 5 to rotate the bearing cover 5 and compress the bearing 4.

[0031] The hollow shaft 3 is the stirring shaft of the stirring device, and stirring blades are distributed on the outside of it for stirring the material; the axial channel 2 in the middle of the hollow shaft 3 can be used for the refueling pipe 9 to pass through; in order to prevent external liquids, dust and other impurities from seeping into the axial channel 2, an end plug with an axial through hole in the middle can be provided on the inner side of the upper end of the axial channel 2. The end plug can be made of metal or elastic material, and the end plug is mounted on the outside of the refueling pipe 9 through the axial through hole.

[0032] The bearing 4 at the lower end of the stirring device in this art operates in a harsh environment characterized by high temperature, high humidity, and significant corrosion. Therefore, grease is typically used as lubricant 28, such as lithium-based grease, which is known to be highly water-resistant and has a wide temperature range. During use, grease has stronger adhesion than oil and more readily forms an oil film on the surface of the equipment, making it more suitable for areas difficult to lubricate. It also provides excellent sealing performance and effectively prevents the intrusion of contaminants. Its high viscosity makes it resistant to high temperatures and pressures, suitable for heavy loads and extreme environments, and allows for longer maintenance cycles.

[0033] The oil groove can provide a channel for the migration of grease from the hollow shaft 3 to the bearing 4. The opening size of the oil groove is slightly larger than the inner diameter size of the outer ring of the bearing 4, which can make the oil inlet of the bearing 4 cavity (that is, the cavity between the ball and the inner and outer rings) fully connected with the oil storage cavity 8, ensuring that the grease can smoothly enter the bearing 4 cavity, so that the rollers and the inner and outer rings can be fully lubricated, making the hollow shaft 3 rotate more smoothly, extending the service life of the hollow shaft 3 and the bearing 4, extending the maintenance cycle, and reducing the maintenance and replacement frequency.

[0034] In the prior art, the upper end of the stirring shaft (hollow shaft 3) is exposed outside the composting device to facilitate transmission connection with a power drive unit such as a motor. In this embodiment, the upper end of the refueling pipe 9 is located above the hollow shaft 3, so that the refueling gun is also located outside the composting device, which is more convenient for operators to add grease to the refueling gun or manually inject grease into the oil storage chamber 8 using a grease gun.

[0035] If desired, during the material degradation process, to reduce corrosion of the material mixture on the housing 1 and bearing gland 5, both can be made of corrosion-resistant stainless steel. To prevent the bearing gland 5 from abrading the hollow shaft 3, a small gap can be reserved near the bearing gland 5. The seal 6 can be a conventionally suitable dynamic seal structure or ring, such as a packing seal, a combination of an oil seal and a labyrinth seal, or a leather cup seal. The refueling gun can be an electric refueling gun, a pneumatic refueling gun, or an oil pump capable of detecting the pressure in the oil reservoir 8. Alternatively, a pressure sensor can be installed in the oil reservoir 8 via the axial passage 2. The pressure sensor's monitoring data allows for regular grease replenishment of the oil reservoir 8 via a grease gun. The refueling pipe 9 and the annular baffle 7 can be connected using conventional removable fixing methods, such as threaded connections, or conventionally non-removable fixing methods, such as welding or riveting.

[0036] The grease in the bearing 4 cavity will be lost as the bearing 4 rotates, and may also volatilize and leak from the gap 18 between the hollow shaft 3, the housing 1, the seal 6 and the bearing gland 5. As the grease in the bearing 4 cavity decreases, the amount of grease in the oil storage cavity 8 also decreases, and the pressure drops.

[0037] During the operation of the aerobic composting device, the refueling gun can automatically detect the pressure changes in the oil storage chamber 8. When the oil storage chamber 8 lacks grease, the pressure decreases, and the refueling gun can automatically start to inject grease into the refueling pipe 9. The grease is replenished into the oil storage chamber 8 along the refueling pipe 9, so that the pressure in the oil storage chamber 8 is restored to its original state, and the pressure in the oil storage chamber 8 and the bearing 4 cavity is slightly greater than the pressure in the concrete base 29, preventing the material mixture from seeping into the bearing 4 installation cavity from the gap 18 between the bearing cover 5 and the protective shell 1, thereby destroying the lubrication of the bearing 4; in the process of the inner ring of the bearing 4 rotating with the hollow shaft 3, the grease can be delivered into the bearing 4 cavity and evenly applied, so that the inner and outer rings and the ball surface are covered with oil film, maintaining good lubrication performance, extending the service life of the bearing 4, reducing the failure rate of the bearing 4, and reducing the number of replacement times of the bearing 4.

[0038] The present utility model has a reasonable and compact structure and is easy to use. It can determine the lubrication status of the bearing 4 based on the pressure change in the oil storage chamber 8. When the oil storage chamber 8 lacks grease, grease is automatically added to the oil storage chamber 8 through the refueling gun and the refueling pipe 9 installed in the hollow shaft 3, ensuring that the bearing 4 at the lower end of the stirring device can always be fully lubricated, maintaining good lubrication performance, reducing the wear of the bearing 4, extending the service life of the bearing 4, reducing the failure rate of the bearing 4, reducing the number of replacements of the bearing 4, and avoiding affecting the continuity of the operation of the aerobic composting device. The refueling gun is located outside the aerobic composting device, which is more convenient for operators to manually operate the refueling gun in an emergency or to refill the refueling gun with grease, greatly reducing the difficulty of lubricating the bearing 4 at the lower end of the stirring device, improving lubrication efficiency and lubrication reliability, effectively extending the maintenance cycle of the device, reducing the failure rate of equipment operation, and improving production efficiency.

[0039] The above bearing lubrication device can be further optimized and / or improved according to actual needs:

[0040] Example 2: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the refueling gun includes a sealing piston 10, a piston rod 11, a compression spring 12, a gun body 13 and a gun end cover 14 with an opening downward. The opening of the gun body 13 is upward, and an oil outlet that passes through the inside and outside is provided in the middle of the bottom end of the gun body 13, and the inner side of the oil outlet is installed together with the outer side of the refueling pipe 9; a sealing piston 10 is provided in the gun body 13, and a piston rod 11 with an upper end located above the gun body 13 is fixedly installed in the middle of the upper side of the sealing piston 10; a gun end cover 14 with a middle part sleeved on the outside of the piston rod 11 is installed on the outer side of the upper end of the gun body 13, and a compression spring 12 is provided in the gun body 13 corresponding to the position between the inner side of the top end of the oil gun end cover 14 and the upper side of the sealing piston 10, and the compression spring 12 is sleeved on the outer side of the piston rod 11.

[0041] In the above-described technical solution, the cavity between the gun body 13 and the sealing piston 10 is used to hold grease. By adjusting the wire diameter of the compression spring 12, the elastic force of the compression spring 12, and thus the grease pressure within the gun body 13, can be controlled. This allows the pressure within the oil reservoir 8 and the bearing 4 cavity to be slightly greater than the material pressure within the concrete base 29. This prevents the material mixture from seeping into the bearing 4 mounting cavity through the gap 18 between the bearing gland 5 and the protective housing 1, thereby affecting the lubrication of the bearing 4.

[0042] Depending on the requirements, the oil filling pipe 9 and the gun body 13 can be connected by a detachable connection in the prior art, such as a threaded connection, or by a non-detachable connection in the prior art, such as welding or riveting. To facilitate the addition of grease to the gun body 13, the oil gun end cap 14 and the gun body 13 can be connected by a detachable fixed connection in the prior art, such as a threaded connection or a rotary snap connection.

[0043] During use, after the gun body 13 is filled with grease and the sealing piston 10 and the compression spring 12 are installed in place, a spring preload force is applied to the compression spring 12 (i.e., the spring is in a pre-compressed state), and the spring preload force always acts on the upper end face of the sealing piston 10; when the grease in the oil storage chamber 8 and the bearing 4 chamber is reduced or the grease solidifies and shrinks due to cold, the pressure in the oil storage chamber 8 and the bearing 4 chamber becomes smaller. Under the action of the spring preload force, the spring automatically pushes the sealing piston 10, and the grease in the gun body 13 is replenished into the oil storage chamber 8 through the refueling pipe 9 in time, so that the pressure in the oil storage chamber 8 is always kept constant, thereby ensuring that the bearing 4 can always be reliably and fully lubricated.

[0044] During the operation of the aerobic composting device, if the material temperature rises, the grease expands, which will cause the pressure in the bearing 4 cavity and the oil storage cavity 8 to rise. When the pressure is transmitted to the lower end surface of the piston, the compression spring 12 will be compressed in the reverse direction, so that the grease storage space in the gun body 13 is increased, and the excess grease in the oil storage cavity 8 can flow back through the refueling pipe 9 to the gun body 13 for storage, thereby maintaining the pressure in the bearing 4 lubrication device in dynamic balance.

[0045] By observing the position of the piston rod 11, you can roughly determine the amount of grease in the gun body 13. When the grease in the gun body 13 is used up, open the gun cover 14, remove the compression spring 12 and sealing piston 10, and refill the gun body 13 with grease. After refilling, replace the sealing piston 10 and compression spring 12 in the gun body 13, and finally replace the gun cover. You can also refill the grease regularly according to the grease consumption.

[0046] Example 3: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a pull ring 15 is fixedly mounted on the upper end of the piston rod 11.

[0047] The pull ring 15 makes it easier to remove the sealing piston 10 from the gun body 13. During the process of replenishing grease, the pull ring 15 can prevent the oil gun cover from falling off the piston rod 11, effectively preventing the oil gun cover from being lost.

[0048] The piston rod 11 and the pull ring 15 can be connected by a detachable fixing method in the prior art, such as threaded connection, threaded fastener connection, etc., or by a non-detachable fixing method in the prior art, such as welding, riveting, etc.

[0049] Example 4: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a scale 16 is provided on the outside of the piston rod 11 .

[0050] Through the scale 16, the operator can know the grease consumption in the gun body 13 more clearly and accurately, thereby judging the grease replenishment cycle for regular replenishment and maintenance, and can also understand the changes in the sealing condition of the bearing 4 based on this information.

[0051] Example 5: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a protective end cover 17 with an opening facing downward is fixedly installed on the outer side of the hollow shaft 3 corresponding to the upper side position of the bearing cover 5. The upper end of the bearing cover 5 is inserted into the protective end cover 17, and a gap 18 is left between the outer side of the upper end of the bearing cover 5 and the inner side of the protective cover.

[0052] By such arrangement, the protective end cover 17 can separate the material from the upper end surface of the bearing gland 5 and form a protective channel, thereby reducing the erosion of the material on the seal 6.

[0053] According to the requirements, the bearing cover can be a convex-shaped bearing cover to reduce the size and weight of the bearing cover, facilitate disassembly and maintenance, and also reduce the external dimensions of the protective end cover 17.

[0054] Example 6: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a retaining spring 19 groove is provided on the outer side of the hollow shaft 3 corresponding to the lower side of the bearing 4, and a retaining spring 19 is installed in the retaining spring 19 groove, with the upper end abutting against the lower side of the inner ring of the bearing 4.

[0055] By such arrangement, the retaining spring 19 can play a certain supporting role on the bearing 4 , thereby preventing the bearing 4 and the hollow shaft 3 from moving relative to each other.

[0056] Example 7: As an optimization of Example 6, as shown in the attached Figure 1 As shown, the oil groove includes a first groove 20 and a second groove 21 whose opening sizes decrease from top to bottom. The opening size of the second groove 21 is slightly larger than the outer diameter of the retaining spring 19, and the bottom of the first groove 20 is located on the lower side of the retaining spring 19.

[0057] By such an arrangement, the shape of the oil storage chamber 8 can be adapted to the outer shape of the end of the hollow shaft 3 after the retaining ring 19 is installed, which is beneficial to the flow of grease.

[0058] Example 8: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, an outer ring groove 22 is provided on the outer side of the lower end of the hollow shaft 3 , and the bearing 4 is fixedly installed in the outer ring groove 22 , and the upper end surface of the inner ring of the bearing 4 abuts against the upper groove wall of the outer ring groove 22 .

[0059] Through such an arrangement, the upper groove wall of the outer ring groove 22 can act as a shaft shoulder, and the hollow shaft 3 can be reliably supported by the bearing 4 and the upper groove wall of the outer ring groove 22, preventing the hollow shaft 3 from gradually moving downward under the action of its own weight, thereby affecting its normal rotation.

[0060] Example 9: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the sealing member 6 is an oil seal.

[0061] In the above technical solution, the oil seal is used as the sealing member 6, which can achieve better sealing performance, longer service life, and has a certain adaptability to the vibration of the stirring device and the eccentricity of the hollow shaft 3.

[0062] According to the requirements, the seal 6 can be formed by combining two oil seals with sealing lips facing downwards, or two main lip oil seals in the prior art can be used. Figure 1 As shown, two oil seals are installed back to back to prevent the material mixture from entering the housing 1 through the gap 18 between the bearing cover 5 and the hollow shaft 3, thereby avoiding damaging the lubrication of the bearing 4. At the same time, it can also prevent the lubricant 28 in the bearing 4 from leaking out from the gap 18 between the bearing cover 5 and the hollow shaft 3.

[0063] Example 10: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, an annular seal 23 is installed on the inner side of the upper end of the hollow shaft 3, and the middle part is sleeved on the outer side of the refueling pipe 9.

[0064] This arrangement can effectively prevent external impurities such as liquid and dust from penetrating into the axial channel 2, and can also effectively support the upper portion of the fuel filler pipe 9 to prevent the fuel filler pipe 9 from deforming.

[0065] The annular seal 23 and the hollow shaft 3 can be connected by a detachable fixed installation method in the prior art, such as threaded connection, snap connection, etc., or a non-detachable fixed installation method in the prior art, such as welding, riveting, etc.

[0066] Example 11: As an optimization of the above embodiment, as shown in the attached Figure 1As shown, the outer side of the upper end of the protective shell 1 has a first outer flange 24, and a plurality of first mounting holes that pass through the upper and lower parts are evenly distributed along the circumference of the first outer flange 24. The outer side of the lower end of the bearing cover 5 has a second outer flange 25, and the second outer flange 25 corresponding to each first mounting hole position is provided with a second mounting hole that passes through the upper and lower parts. Each second mounting hole is provided with an anchor bolt 26 whose middle part is located in the corresponding first mounting hole. The outer side of the upper end of the anchor bolt 26 is connected with a fastening nut 27 through a thread, and the lower end of the fastening nut 27 is abutted against the corresponding position on the upper side of the bearing cover 5.

[0067] By such an arrangement, the height of the protective shell 1 exposed from the concrete base 29 can be effectively reduced, which is more conducive to the flow of materials and avoids the accumulation of materials in the protective shell 1; during the maintenance of the bearing 4, the bearing 4 seat can be simply and quickly removed, thereby improving the efficiency of the bearing 4 maintenance operation, and the bearing cover 5 can also reliably fix the bearing 4; the anchor bolts 26 embedded in the concrete base can more safely and reliably fix the protective shell 1 and the bearing cover 5, thereby avoiding the protective shell 1 from wearing the cement base due to vibration.

[0068] Example 12: As an optimization of the above-mentioned embodiment, an outer ring platform is provided on the outer side of the lower end of the bearing cover 5, and a number of vertically penetrating connection holes are evenly distributed on the circumference of the outer ring platform. A threaded hole with an upward opening is provided on the upper end surface of the protective shell 1 corresponding to the position of each connection hole, and a fastening bolt with an upper part located in the corresponding connection hole is provided in each threaded hole.

[0069] By such an arrangement, the height of the protective shell 1 exposed from the concrete base 29 can be effectively reduced, which is more conducive to the flow of materials and avoids the accumulation of materials in the protective shell 1; during the maintenance of the bearing 4, the bearing 4 seat can be simply and quickly removed, thereby improving the maintenance efficiency of the bearing 4 and enabling the bearing cover 5 to reliably fix the bearing 4.

[0070] Example 13: The compost stirring device includes the bearing lubrication device as described above.

[0071] By such an arrangement, grease can be added to the lower end bearing 4 of the compost stirring device more conveniently and labor-savingly, so that the lower end bearing 4 can always maintain good lubrication performance, rotate more smoothly, and effectively extend the maintenance period of the compost stirring device.

[0072] Example 14: The aerobic composting device includes the compost stirring device as described above.

[0073] This arrangement is more conducive to the continuous operation of the aerobic composting device, reduces failure of the compost stirring device caused by lack of lubrication of the bearing 4, and thus improves production efficiency.

[0074] The above technical features respectively constitute the various embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A bearing lubrication device, characterized in that It includes a protective shell and a hollow shaft with an axial channel in the middle. The opening of the protective shell is upward, and the lower end of the hollow shaft is installed in the protective shell through a bearing, and the lower end of the bearing is abutted against the corresponding position on the inner side of the bottom of the protective shell; a bearing cover with an opening downward and a middle part mounted on the outer side of the hollow shaft is fixedly installed on the upper end of the protective shell, and a seal is provided between the bearing cover and the hollow shaft; an oil groove with an upward opening is provided on the inner side of the middle part of the bottom end of the protective shell, and the opening size of the oil groove is slightly larger than the inner diameter size of the outer ring of the bearing; an annular baffle is fixedly installed on the inner side of the lower end of the hollow shaft, and the lower side of the annular baffle, the inner side of the lower end of the hollow shaft, the lower end face of the bearing and the inner side of the oil groove can form an oil storage chamber; a hollow refueling pipe is fixedly installed on the inner side of the annular baffle, the upper end of the refueling pipe is located above the hollow shaft, and the upper end of the refueling pipe is connected to a refueling gun that can automatically replenish grease according to the pressure change of the oil storage chamber.

2. The bearing lubrication device according to claim 1, characterized in that: The refueling gun includes a sealing piston, a piston rod, a compression spring, a gun body and a fuel gun end cover with an opening downward. The opening of the gun body faces upward, and an oil outlet that passes through the inside and outside is provided in the middle of the bottom end of the gun body, and the inner side of the oil outlet is installed together with the outer side of the refueling pipe; a sealing piston is provided in the gun body, and a piston rod with an upper end located above the gun body is fixedly installed in the middle of the upper side of the sealing piston; a fuel gun end cover with a middle part that is sleeved on the outside of the piston rod is installed on the outer side of the upper end of the gun body, and a compression spring is provided in the gun body corresponding to the position between the inner side of the top end of the fuel gun end cover and the upper side of the sealing piston, and the compression spring is sleeved on the outside of the piston rod.

3. The bearing lubrication device according to claim 2, characterized in that: A pull ring is fixedly installed on the upper end of the piston rod; Or / and, a scale is provided on the outside of the piston rod.

4. The bearing lubrication device according to claim 1, 2 or 3, characterized in that: A protective end cover with a downward opening is fixedly installed on the outer side of the hollow shaft corresponding to the upper side of the bearing cover. The upper end of the bearing cover is sleeved in the protective end cover, and a gap is left between the outer side of the upper end of the bearing cover and the inner side of the protective cover.

5. The bearing lubrication device according to claim 1, 2 or 3, characterized in that: A retaining ring groove is provided on the outer side of the hollow shaft corresponding to the lower side of the bearing, and a retaining ring is installed in the retaining ring groove, the upper end of which abuts against the lower side of the bearing inner ring; Or / and, the oil groove includes a first groove and a second groove, the opening size of which decreases from top to bottom, the opening size of the second groove is slightly larger than the outer diameter of the retaining spring, and the bottom of the first groove is located at the lower side of the retaining spring; Or / and, an outer ring groove is provided on the outer side of the lower end of the hollow shaft, the bearing is fixedly installed in the outer ring groove, and the upper end surface of the bearing inner ring abuts against the upper groove wall of the outer ring groove.

6. The bearing lubrication device according to claim 4, characterized in that: A retaining ring groove is provided on the outer side of the hollow shaft corresponding to the lower side of the bearing, and a retaining ring is installed in the retaining ring groove, the upper end of which abuts against the lower side of the bearing inner ring; Or / and, the oil groove includes a first groove and a second groove, the opening size of which decreases from top to bottom, the opening size of the second groove is slightly larger than the outer diameter of the retaining spring, and the bottom of the first groove is located at the lower side of the retaining spring; Or / and, an outer ring groove is provided on the outer side of the lower end of the hollow shaft, the bearing is fixedly installed in the outer ring groove, and the upper end surface of the bearing inner ring abuts against the upper groove wall of the outer ring groove.

7. The bearing lubrication device according to claim 1, 2, 3 or 6, characterized in that: The seal is an oil seal; Or / and, an annular seal is installed on the inner side of the upper end of the hollow shaft, the middle part of which is sleeved on the outer side of the refueling pipe; Or / and, the outer side of the upper end of the protective shell has a first outer flange, and the first outer flange has a plurality of first mounting holes that pass through the upper and lower parts evenly distributed along the circumference, and the outer side of the lower end of the bearing cover has a second outer flange, and the second outer flange corresponding to each first mounting hole position is provided with a second mounting hole that passes through the upper and lower parts, and each second mounting hole is provided with an anchor bolt whose middle part is located in the corresponding first mounting hole, and a fastening nut is connected to the outer side of the upper end of the anchor bolt through a thread, and the lower end of the fastening nut is abutted against the corresponding position on the upper side of the bearing cover; or, the outer side of the lower end of the bearing cover is provided with an outer ring platform, and a plurality of connecting holes that pass through the upper and lower parts evenly distributed along the circumference of the outer ring platform, and a threaded hole with an opening facing upward is provided on the upper end surface of the protective shell corresponding to each connecting hole position, and each threaded hole is provided with a fastening bolt whose upper part is located in the corresponding connecting hole.

8. The bearing lubrication device according to claim 5, characterized in that: The seal is an oil seal; Or / and, an annular seal is installed on the inner side of the upper end of the hollow shaft, the middle part of which is sleeved on the outer side of the refueling pipe; Or / and, the outer side of the upper end of the protective shell has a first outer flange, and the first outer flange has a plurality of first mounting holes that pass through the upper and lower parts evenly distributed along the circumference, and the outer side of the lower end of the bearing cover has a second outer flange, and the second outer flange corresponding to each first mounting hole position is provided with a second mounting hole that passes through the upper and lower parts, and each second mounting hole is provided with an anchor bolt whose middle part is located in the corresponding first mounting hole, and a fastening nut is connected to the outer side of the upper end of the anchor bolt through a thread, and the lower end of the fastening nut is abutted against the corresponding position on the upper side of the bearing cover; or, the outer side of the lower end of the bearing cover is provided with an outer ring platform, and a plurality of connecting holes that pass through the upper and lower parts evenly distributed along the circumference of the outer ring platform, and a threaded hole with an opening facing upward is provided on the upper end surface of the protective shell corresponding to each connecting hole position, and each threaded hole is provided with a fastening bolt whose upper part is located in the corresponding connecting hole.

9. A compost stirring device, characterized in that The bearing lubrication device comprises the bearing lubrication device according to any one of claims 1 to 8.

10. An aerobic composting device, characterized in that The compost stirring device comprises the compost stirring device as claimed in claim 9.

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