A liftable biogas digester homogenizing and mixing device

Abstract

This utility model relates to the technical field of biogas engineering equipment, specifically a liftable biogas digester homogenizing and stirring device, which solves the problems mentioned in the background art. It includes a hydraulic cylinder, the output end of which is connected to a motor housing, which houses a motor. The output end of the motor is connected to a stirring shaft, and stirring blades are mounted on the end of the stirring shaft away from the motor. The hydraulic cylinder is installed inside a hydraulic cylinder housing, with crossbars connected to both sides of the housing. A side slide rail is connected to the end of each crossbar away from the housing, and a hanging rod is fixedly connected to the middle of the crossbars. A top slide rail is connected to the end of the hanging rod away from the crossbars, and a pull rope is provided in the middle of the hanging rod. This utility model uses a hydraulic cylinder to drive a liftable stirring structure, combined with three-bladed propeller blades (with anti-winding serrations and guide ribs) to improve stirring efficiency and prevent clogging.

Description

Technical Field

[0001] This utility model relates to the technical field of biogas engineering equipment, specifically a liftable biogas digester homogenizing and stirring device. Background Technology

[0002] Biogas digesters, as an important renewable energy facility, are widely used for the anaerobic fermentation treatment of agricultural waste, livestock manure, and organic wastewater. In the biogas production process, homogenization and mixing are crucial for improving gas production efficiency. Their role is to promote raw material mixing, prevent scum crusting, and enhance the contact between microorganisms and materials, thereby increasing methane production. However, traditional mixing devices have many problems in practical applications. For example, conventional mixing blades are easily entangled by fibrous materials, leading to increased power loss or even shutdown. Furthermore, the mixing range is limited, making it difficult to achieve uniform mixing of materials within the digester. Fixed mixing devices cannot adapt to changes in liquid level or sediment thickness, affecting the mixing effect. Utility Model Content

[0003] To solve the above problems, this utility model provides the following technical solution: a liftable biogas digester homogenizing and stirring device, including a hydraulic cylinder, the output end of the hydraulic cylinder being connected to a motor housing, a motor being installed inside the motor housing, the output end of the motor being connected to a stirring shaft, a stirring blade being installed at the end of the stirring shaft away from the motor, the hydraulic cylinder being installed inside a hydraulic cylinder housing, crossbars being connected to both sides of the hydraulic cylinder housing, a side slide rail being connected to the end of the crossbar away from the hydraulic cylinder housing, a hanging rod being fixedly connected to the middle of the crossbar, a top slide rail being connected to the end of the hanging rod away from the crossbar, and a pull rope being provided in the middle of the hanging rod.

[0004] Preferably, the stirring blade is a detachable three-bladed propeller structure, the blade is provided with anti-entanglement serrations, and a flow guide rib is welded on the back of the blade. The tooth pitch of the serration is 1 / 5 to 1 / 3 of the blade chord length, and the inclination angle of the flow guide rib is 15° to 25°.

[0005] Preferably, the motor housing is provided with an annular cooling air duct, the cooling air duct is connected to an explosion-proof fan, the air inlet of the explosion-proof fan is connected to an air dryer, and the air outlet is directly opposite the end of the motor winding.

[0006] Preferably, the bottom of the hydraulic cylinder housing is provided with a sealed guide sleeve, and a self-lubricating bearing is embedded in the inner wall of the guide sleeve.

[0007] Preferably, the surface of the stirring shaft is covered with a polytetrafluoroethylene layer with a thickness of 0.5-1 mm.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] The hydraulic cylinder drives a liftable mixing structure, which, combined with a three-bladed propeller blade (with anti-winding serrations and guide ribs), improves mixing efficiency and prevents clogging. It adopts a double slide rail for stable support, self-lubricating bearing guidance, and a PTFE-coated mixing shaft to ensure smooth operation and corrosion resistance. At the same time, it is equipped with an explosion-proof air-cooling system (including a dryer) to ensure safe heat dissipation of the motor. Overall, it achieves high efficiency, reliability, and long service life of biogas digester homogenization mixing. Attached Figure Description

[0010] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the stirring blade structure of this utility model.

[0013] In the diagram: 1. Hydraulic cylinder; 2. Motor housing; 3. Motor; 4. Agitator shaft; 5. Agitator blades; 6. Hydraulic cylinder housing; 7. Crossbar; 8. Side slide rail; 9. Hanging rod; 10. Top slide rail; 11. Serrated edge; 12. Guide rib; 13. Cooling duct; 14. Explosion-proof fan; 15. Air dryer; 16. PTFE layer; 17. Guide sleeve; 18. Lubricating bearing; 19. Pull rope. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0015] like Figure 1-2 As shown, the liftable biogas digester homogenizing and stirring device of this embodiment includes a hydraulic cylinder 1. The output end of the hydraulic cylinder 1 is connected to a motor housing 2. A motor 3 is installed inside the motor housing 2. The output end of the motor 3 is connected to a stirring shaft 4. A stirring blade 5 is installed at the end of the stirring shaft 4 away from the motor 3. The hydraulic cylinder 1 is installed inside a hydraulic cylinder housing 6. A crossbar 7 is connected to both sides of the hydraulic cylinder housing 6. The end of the crossbar 7 away from the hydraulic cylinder housing 6 is connected to a side slide rail 8. A hanging rod 9 is fixedly connected to the middle of the crossbar 7. The end of the hanging rod 9 away from the crossbar 7 is connected to a top slide rail 10. A pull rope 19 is provided in the middle of the hanging rod 9.

[0016] The stirring blade 5 is a detachable three-bladed propeller structure. The blade is equipped with anti-entanglement serrations 11, and flow guide ribs 12 are welded on the back of the blade. The tooth pitch of the serrations 11 is 1 / 5 to 1 / 3 of the blade chord length, and the inclination angle of the flow guide ribs 12 is 15° to 25°, which optimizes fluid guidance and enhances stirring efficiency.

[0017] The motor housing 2 is equipped with an annular cooling air duct 13. The cooling air duct 13 is connected to an explosion-proof fan 14. The air inlet of the explosion-proof fan 14 is connected to an air dryer 15, and the air outlet is directly facing the end of the motor winding 3 to directly cool the high-temperature parts and prevent the motor from overheating.

[0018] The bottom of the hydraulic cylinder housing 6 is provided with a sealed guide sleeve 17, and the inner wall of the guide sleeve 17 is embedded with a self-lubricating bearing 18 to ensure smooth movement of the hydraulic rod and reduce friction and wear.

[0019] The surface of the stirring shaft 4 is coated with a polytetrafluoroethylene layer 16 with a thickness of 0.5-1mm, which has both corrosion resistance and anti-adhesion properties, extending its service life.

[0020] The working principle of this utility model is as follows:

[0021] After confirming that the power supply to motor 3, hydraulic cylinder 1, and explosion-proof fan 14 is normal, check whether the hydraulic system oil pressure is stable and ensure that hydraulic cylinder 1 can extend and retract normally. Start explosion-proof fan 14. After the outside air is dehydrated by air dryer 15, it is blown to the end of motor 3 winding through annular cooling air duct 13 to reduce the motor operating temperature in advance. Set the target lifting height of hydraulic cylinder 1 according to the material level or sediment thickness in the biogas digester (which can be adjusted by external control system or manually). The piston rod of hydraulic cylinder 1 extends downward, pushing motor housing 2 and stirring shaft 4 to descend vertically. The sealed guide sleeve 17 at the bottom of hydraulic cylinder housing 6 cooperates with self-lubricating bearing 18 to ensure that stirring shaft 4 moves linearly without deviation. Simultaneously pull the ropes 19 on the left and right lifting rods 9. The crossbar 7 slides along the side slide rail 8, and the lifting rods 9 move synchronously along the top slide rail 10, forming double guidance to prevent lateral swaying. After the stirring blade 5 reaches the preset depth, the hydraulic system... After the pressure is fixed and the stirring is ready to start, the motor 3 drives the stirring shaft 4 to rotate, which in turn drives the three-bladed propeller-type stirring blades 5 to work. The serrations 11 on the edge of the blades break up easily entangled materials such as fibers and straw with high-frequency cutting. The tooth pitch (1 / 5-1 / 3 of the blade chord length) ensures cutting efficiency. The guide ribs 12 on the back of the blades (tilt angle 15°-25°) push the material to form a two-way flow in the axial and radial directions, eliminating stirring dead corners. The polytetrafluoroethylene layer 16 of the stirring shaft 4 prevents corrosion from corrosive media such as H2S. The explosion-proof fan 14 continuously delivers dry and cold air to the motor 3 to avoid overheating of the windings. At the same time, the dry air suppresses the influence of humidity in the biogas environment. If the material in the pool is clearly layered, the stirring blades 5 can be raised and lowered in sections by the hydraulic cylinder 1 to carry out layer-by-layer stirring for different liquid levels. The stirring mechanism can be moved laterally by sliding the crossbar 7 on the side slide rail 8 to expand the stirring coverage area (requires the support of the matching pool structure).

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liftable biogas digester homogenizing and stirring device, comprising a hydraulic cylinder (1), characterized in that, The output end of the hydraulic cylinder (1) is connected to the motor housing (2), and the motor housing (2) is equipped with a motor (3). The output end of the motor (3) is connected to the stirring shaft (4). The stirring shaft (4) is equipped with stirring blades (5) at the end away from the motor (3). The hydraulic cylinder (1) is installed in the hydraulic cylinder housing (6). The two sides of the hydraulic cylinder housing (6) are respectively connected to crossbars (7). The end of the crossbar (7) away from the hydraulic cylinder housing (6) is connected to the side slide rail (8). The middle part of the crossbar (7) is fixedly connected to the lifting rod (9). The end of the lifting rod (9) away from the crossbar (7) is connected to the top slide rail (10). The middle part of the lifting rod (9) is provided with a pull rope (19).

2. The liftable biogas digester homogenizing and stirring device according to claim 1, characterized in that: The stirring blade (5) is a detachable three-bladed propeller structure. The blade is provided with anti-entanglement serrations (11), and a flow guide rib (12) is welded on the back of the blade. The tooth pitch of the serrations (11) is 1 / 5-1 / 3 of the blade chord length, and the inclination angle of the flow guide rib (12) is 15°-25°.

3. The liftable biogas digester homogenizing and stirring device according to claim 1, characterized in that: The motor housing (2) is provided with an annular cooling air duct (13), and the cooling air duct (13) is connected to an explosion-proof fan (14). The air inlet of the explosion-proof fan (14) is connected to an air dryer (15), and the air outlet is directly opposite the end of the motor (3) winding.

4. The liftable biogas digester homogenizing and stirring device according to claim 1, characterized in that: The bottom of the hydraulic cylinder housing (6) is provided with a sealed guide sleeve (17), and a self-lubricating bearing (18) is embedded in the inner wall of the guide sleeve (17).

5. The liftable biogas digester homogenizing and stirring device according to claim 1, characterized in that: The surface of the stirring shaft (4) is covered with a polytetrafluoroethylene layer (16) with a thickness of 0.5-1 mm.

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