Sludge aerobic fermentation equipment

Abstract

The utility model belongs to the technical field of sludge treatment, and particularly relates to sludge aerobic fermentation equipment which comprises a fermentation tank body, an upper bearing seat is arranged in the middle of an upper cover at the top of the fermentation tank body, and an upper flange is arranged above the upper bearing seat; the stirring main shaft is hollow, a hot oxygen inlet is formed in the bottom of the stirring main shaft, stirring blades are arranged outside the stirring main shaft, and hot oxygen discharge holes are formed in the shaft wall; the upper end of the stirring spindle is connected with an upper bearing seat; a lower bearing seat connected with the lower end of the stirring main shaft is arranged in the middle of the base; the lower end of a thrust shaft in the thrust bearing seat bracket is connected with the upper flange through a universal coupling; a retaining pawl and a retaining ratchet wheel are arranged on the retaining pawl frame; the retaining ratchet wheel is fixedly connected with the thrust shaft; the ratchet wheel assembly is positioned below the lower bearing seat and comprises a ratchet wheel cover and a rocker arm; the end, away from the rotating spindle, of the rocker is connected with a hydraulic pushing mechanism. According to the sludge fermentation device, a heat source and oxygen can be uniformly distributed in a material, the sludge fermentation efficiency is effectively improved, and the sludge fermentation device has a relatively good market application prospect.

Description

Technical Field

[0001] This utility model belongs to the field of sludge treatment technology, specifically relating to an aerobic fermentation device for sludge. Background Technology

[0002] Aerobic fermentation of sludge is a comprehensive sludge treatment technology that achieves harmlessness, volume reduction, and stabilization; it is also known as aerobic composting. It utilizes aerobic thermophilic bacteria to decompose organic matter in sludge, forming a substance similar to humus soil. The metabolic process generates heat, raising the temperature of the compost layer to over 55°C, effectively killing pathogens, parasite eggs, and viruses, and increasing the fertility of the sludge. The main applications of fermented sludge include: farmland use, forest land use, landscaping, land remediation of abandoned mines, and as cover soil for landfills. Aerobic fermentation technology has attracted attention due to its low investment and low operating costs, and has a wide range of applications.

[0003] Patent application CN202410116487.3 discloses a high-temperature aerobic fermentation system and method for sludge, including a base and a fermentation tank located at the center of the top of the base. This invention, during high-temperature aerobic fermentation of sludge, can simultaneously perform the crushing of aerobic fermentation materials, the mixing of sludge and aerobic fermentation materials, and the automatic feeding of sludge, thereby reducing equipment costs. The rotational crushing operation of the crushing blades, the rotational mixing operation of the stirring rollers, and the rotational feeding operation of the spiral feeding rollers are all synchronously completed through gear meshing and transmission belt drive. This invention discloses the use of heating components to provide a heat source for the sludge fermentation process; however, it cannot ensure that the heat source and oxygen are evenly distributed in the material, resulting in a limited improvement in sludge fermentation efficiency and failing to guarantee an improved sludge fermentation effect.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide an aerobic fermentation device for sludge to solve the problem of uneven distribution of heat source and oxygen in the material, which is not conducive to improving the fermentation efficiency of sludge.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An aerobic fermentation device for sludge includes:

[0008] The fermentation tank has a top cover and a bottom discharge port; the top cover has an upper bearing seat in the middle, and an upper flange is provided above the upper bearing seat;

[0009] The stirring shaft is located inside the fermentation tank. It is hollow inside and has a hot oxygen inlet at the bottom. The stirring shaft is equipped with stirring blades on the outside and hot oxygen discharge holes are opened on the shaft wall. The upper end of the stirring shaft is connected to the upper bearing seat.

[0010] The base is located below the fermentation tank and has a material leakage groove corresponding to the position of the discharge port; the middle of the base is provided with a lower bearing seat that connects to the lower end of the stirring main shaft;

[0011] A thrust bearing housing bracket is located in the middle of the upper part of the upper cover, and a thrust bearing housing is provided inside it; a thrust bearing is provided inside the thrust bearing housing, and a thrust shaft is provided in the middle of the thrust bearing; the lower end of the thrust shaft is connected to the upper flange through a universal coupling.

[0012] A ratchet stop bracket is located above the thrust bearing seat bracket, and is provided with a ratchet stop pawl and a ratchet stop wheel that cooperate with each other; the ratchet stop wheel is fixedly connected to the thrust shaft by an adjusting nut;

[0013] A ratchet assembly, located below the lower bearing seat, includes a ratchet cover and a rocker arm; the ratchet cover has a ratchet fixedly connected to the lower end of the stirring spindle; the rocker arm is rotatably connected to the lower end of the stirring spindle, and has a pawl shaft and a spring pull pin inside; the pawl shaft has a pawl that cooperates with the ratchet, and the spring pull pin has a tension spring connected to the rear end of the pawl;

[0014] A hydraulic actuation mechanism is connected to the end of the rocker arm away from the rotating main shaft.

[0015] Preferably, the stirring blades include two-wing stirring arms, four-wing stirring arms, and twelve-wing stirring arms; multiple sets of two-wing stirring arms are arranged in the middle section of the stirring main shaft; one set of four-wing stirring arms is arranged at the lower end of the stirring main shaft; and one set of twelve-wing stirring arms is arranged at the upper end of the stirring main shaft.

[0016] Preferably, the connection between the two-wing stirring arm and the stirring main shaft corresponds to the position of the hot oxygen discharge hole, and its wing plate is composed of an upper wing plate and a lower wing plate; a gap is left between the upper wing plate and the lower wing plate of the two-wing stirring arm to form an air duct, and an opening is provided on one side of the air duct.

[0017] Preferably, the wing plate of the four-wing stirring arm has the same structure as the wing plate of the two-wing stirring arm, and multiple scraper plates are spaced apart at the bottom of its lower wing plate.

[0018] Preferably, the base is provided with a discharge push arm that is rotatably connected to the stirring main shaft, and the discharge push arm is provided with a discharge turntable that is rotatably connected to the stirring main shaft; the discharge turntable is provided with a plurality of discharge port baffles corresponding to the positions of the leakage trough.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The aerobic fermentation equipment for sludge of this utility model introduces external heat source and air into the fermentation tank through the heat and oxygen inlet at the bottom of the stirring shaft at the same time. Combined with stirring blades to stir the material, the heat source and oxygen can be evenly distributed in the material, which is conducive to improving the sludge fermentation efficiency and ensuring and improving the sludge fermentation effect.

[0021] (2) In the aerobic fermentation equipment for sludge of this utility model, the ratchet assembly and the hydraulic push mechanism work together to realize the rotation and stirring of the stirring main shaft. The anti-reverse pawl and anti-reverse ratchet above the stirring main shaft work together to prevent the stirring main shaft from rotating in the opposite direction when it stops, thus preventing sludge from entering through the air duct and blocking the hot oxygen discharge hole.

[0022] (3) In the aerobic fermentation equipment for sludge of this utility model, the thrust shaft in the middle of the thrust bearing is connected to the upper part of the stirring main shaft through a universal coupling, which can play the role of correction and positioning, and ensure the stability of the stirring main shaft during the stirring process. Attached Figure Description

[0023] Figure 1 This is an external schematic diagram of the present invention;

[0024] Figure 2 This is a bottom view of the present invention;

[0025] Figure 3 This is a schematic diagram of the stirring spindle of this utility model and the components connected thereto.

[0026] Figure 4 This is an enlarged view of the upper end connecting component of the stirring spindle of this utility model;

[0027] Figure 5 This is a schematic diagram of the internal structure of the ratchet assembly of this utility model;

[0028] Figure 6 This is a schematic diagram of the discharge push arm and discharge port baffle of this utility model;

[0029] Explanation of key figure labels:

[0030] 1. Fermentation tank body; 2. Top cover; 3. Discharge port; 4. Upper bearing seat; 5. Upper flange; 6. Agitator shaft; 7. Base; 8. Lower bearing seat; 9. Thrust bearing seat bracket; 10. Thrust bearing seat; 11. Thrust shaft; 12. Universal coupling; 13. Anti-reverse ratchet bracket; 14. Anti-reverse ratchet; 15. Anti-reverse ratchet; 16. Ratchet cover; 17. Rocker arm; 18. Ratchet; 19. Racket shaft; 20. Spring tie rod; 21. Racket; 22. Tension spring; 23. Two-wing agitator arm; 24. Four-wing agitator arm; 25. Twelve-wing agitator arm; 26. Air duct; 27. Sludge scraper; 28. Discharge push arm; 29. ​​Discharge turntable; 30. Discharge port baffle. Detailed Implementation

[0031] The technical solution of this utility model patent will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] See attached document Figure 1-6 An aerobic fermentation device for sludge, comprising:

[0035] The vertical fermentation tank 1 has a top cover 2 and a bottom discharge port 3; the top cover 2 has an upper bearing seat 4 in the middle, and an upper flange 5 is provided above the upper bearing seat 4.

[0036] The stirring shaft 6 is located inside the fermentation tank 1. It is hollow inside and has a hot oxygen inlet at the bottom. The stirring shaft 6 is equipped with stirring blades on the outside and hot oxygen discharge holes on the shaft wall. The upper end of the stirring shaft 6 is connected to the bearing seat 4. The heat source and oxygen enter the stirring shaft 6 through the hot oxygen inlet. When the stirring blades stir the material, the heat and oxygen can be evenly distributed in the material, which is beneficial to improving the sludge fermentation efficiency.

[0037] The base 7 is located below the fermentation tank 1, and a material leakage groove corresponding to the position of the discharge port 3 is provided on it; the middle of the base 7 is provided with a lower bearing seat 8 that connects to the lower end of the stirring main shaft 6;

[0038] The thrust bearing housing bracket 9 is located in the middle of the upper cover 2, and a thrust bearing housing 10 is installed inside it; a thrust bearing is installed inside the thrust bearing housing 10, and a thrust shaft 11 is installed in the middle of the thrust bearing; the lower end of the thrust shaft 11 is connected to the upper flange 5 through a universal coupling 12, which can play the role of correction and positioning, and ensure the stability of the stirring main shaft 6 during the stirring process.

[0039] The anti-reverse ratchet bracket 13 is located above the thrust bearing seat bracket 9, and is provided with an anti-reverse ratchet 14 and an anti-reverse ratchet 15 that cooperate with each other; the anti-reverse ratchet 15 is fixedly connected to the thrust shaft 11 by an adjusting nut; the anti-reverse ratchet 14 and the anti-reverse ratchet 15 cooperate to prevent the stirring main shaft 6 from rotating in the opposite direction when it stops rotating.

[0040] The ratchet assembly, located below the lower bearing housing 8, includes a ratchet cover 16 and a rocker arm 17. The ratchet cover 16 has a ratchet 18 fixedly connected to the lower end of the stirring shaft 6 inside. The rocker arm 17 is rotatably connected to the lower end of the stirring shaft 6, and has a pawl shaft 19 and a spring pull pin 20 inside. The pawl shaft 19 has a pawl 21 that cooperates with the ratchet 18, and the spring pull pin 20 has a tension spring 22 that is connected to the rear end of the pawl 21.

[0041] A hydraulic actuation mechanism is connected to the end of the rocker arm 17 furthest from the rotating main shaft. In this embodiment, the hydraulic actuation mechanism uses a hydraulic cylinder.

[0042] The equipment's process flow is as follows: mixing dry and wet materials with fermentation bacteria → electric feeding → automatic temperature control and fermentation → hydraulically driven turning → automatic heating and air supply → quantitative and continuous automatic discharge of fermented material. Specifically: the dry and wet materials are mixed evenly and the moisture content is reduced by a twin-shaft mixer; electric feeding is achieved through a type B bucket elevator, and the raw materials are sent into the fermentation tank through a star-shaped airlock unloader; the raw materials in the tank are automatically temperature-controlled for fermentation by an industrial-grade hot air blower; the central shaft is driven by a hydraulic cylinder to rotate the mixing blades for turning while simultaneously heating and supplying air; the fermented material is discharged by a hydraulic cylinder driving the discharge arm to rotate.

[0043] In this embodiment, the stirring blades include two-wing stirring arms 23, four-wing stirring arms 24, and twelve-wing stirring arms 25. Four sets of two-wing stirring arms 23 are arranged in the middle section of the stirring main shaft 6; one set of four-wing stirring arms 24 is arranged at the lower end of the stirring main shaft 6; and one set of twelve-wing stirring arms 25 is arranged at the upper end of the stirring main shaft 6. The connection point between the two-wing stirring arms 23 and the stirring main shaft 6 corresponds to the position of the heat and oxygen discharge port. The two-wing stirring arms 23 have upper and lower wing plates. A gap is left between the upper and lower wing plates of the two-wing stirring arms 23 to form an air duct 26, with an opening on one side of the air duct 26. When an external heat source and oxygen enter the stirring main shaft 6, they enter the air duct 26 through the heat and oxygen discharge port and flow out from the opening on one side of the air duct 26 to mix with the material. As the stirring main shaft 6 rotates continuously, heat and oxygen can be evenly distributed to the material, which is beneficial for improving the sludge fermentation efficiency.

[0044] Two-wing stirring arms 23, four-wing stirring arms 24, and twelve-wing stirring arms 25 are positioned at different heights to stir materials at different locations. The wing plates of the four-wing stirring arm 24 have the same structure as those of the two-wing stirring arm 23, with multiple scraper blades 27 spaced apart at the bottom of its lower wing plate. When the stirring shaft 6 rotates, the scraper blades 27 can agitate the materials at the bottom of the fermentation tank 1, preventing long-term accumulation of materials from affecting the fermentation effect.

[0045] Additionally, a discharge push arm 28, rotatably connected to the mixing shaft 6, is located below the base 7. A discharge turntable 29, also rotatably connected to the mixing shaft 6, is mounted on the discharge push arm 28. The discharge turntable 29 has multiple discharge port baffles 30 corresponding to the positions of the material leakage trough. The discharge process utilizes a separate hydraulic cylinder to push the discharge push arm 28, with the discharge volume determined by controlling the cylinder. When the discharge push arm 28 is subjected to thrust, it can rotate the discharge turntable 29, causing the discharge port baffles 30 to move away from below the material leakage trough, facilitating material discharge from the discharge port 3.

[0046] In actual use, sludge is fed through the feed inlet of the upper cover 2, and heat and oxygen enter the mixing main shaft 6 through the hot oxygen inlet at the bottom of the main shaft. When the hydraulic push mechanism drives the rocker arm 17 of the ratchet assembly to reciprocate, it can drive the ratchet 18 to rotate, which in turn drives the mixing main shaft 6 and the mixing blades to rotate and mix the sludge. During the mixing process, high-temperature oxygen is discharged from the hot oxygen discharge hole on the shaft wall of the mixing main shaft 6 into the air duct 26 formed between the upper and lower blades of the four-wing mixing arm 24, and is discharged from the opening on one side of the air duct 26 into the sludge, making full contact with the sludge, and is evenly distributed to all parts of the material as the mixing blades rotate.

[0047] Since the hydraulic drive mechanism is reciprocating, to prevent the mixing shaft 6 from reversing when it stops rotating, a stop pawl 14 and a stop ratchet 15 are provided on the top of the mixing shaft 6. The stop ratchet 15 rotates in the same direction as the ratchet 18 inside the ratchet assembly. When the stop pawl 14 reverses under the action of the hydraulic drive mechanism, the pawl 21 inside the ratchet assembly remains stationary and prevents the ratchet 18 from reversing, thereby preventing the mixing shaft 6 from reversing and avoiding sludge from entering the air duct 26 and clogging the hot oxygen discharge hole.

[0048] This utility model of sludge aerobic fermentation equipment introduces an external heat source and oxygen into the hollow stirring shaft 6, and then discharges them through the heat and oxygen discharge hole and the air duct 26 opening. This allows for full contact with the sludge during the stirring process, and even distribution of the oxygen to all parts of the material, which is beneficial to improving the sludge fermentation efficiency. It is very practical and has good market application prospects.

[0049] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. An aerobic fermentation device for sludge, characterized in that, include: The fermentation tank has a top cover and a bottom discharge port; the top cover has an upper bearing seat in the middle, and an upper flange is provided above the upper bearing seat; The stirring shaft is located inside the fermentation tank. It is hollow inside and has a hot oxygen inlet at the bottom. The stirring shaft is equipped with stirring blades on the outside and hot oxygen discharge holes are opened on the shaft wall. The upper end of the stirring shaft is connected to the upper bearing seat. The base is located below the fermentation tank and has a material leakage groove corresponding to the position of the discharge port; the middle of the base is provided with a lower bearing seat that connects to the lower end of the stirring main shaft; A thrust bearing housing bracket is located in the middle of the upper part of the upper cover, and a thrust bearing housing is provided inside it; a thrust bearing is provided inside the thrust bearing housing, and a thrust shaft is provided in the middle of the thrust bearing; the lower end of the thrust shaft is connected to the upper flange through a universal coupling. A ratchet stop bracket is located above the thrust bearing seat bracket, and is provided with a ratchet stop pawl and a ratchet stop wheel that cooperate with each other; the ratchet stop wheel is fixedly connected to the thrust shaft by an adjusting nut; A ratchet assembly, located below the lower bearing seat, includes a ratchet cover and a rocker arm; the ratchet cover has a ratchet fixedly connected to the lower end of the stirring spindle; the rocker arm is rotatably connected to the lower end of the stirring spindle, and has a pawl shaft and a spring pull pin inside; the pawl shaft has a pawl that cooperates with the ratchet, and the spring pull pin has a tension spring connected to the rear end of the pawl; A hydraulic actuation mechanism is connected to the end of the rocker arm away from the stirring shaft.

2. The aerobic fermentation equipment for sludge according to claim 1, characterized in that, The stirring blades include two-wing stirring arms, four-wing stirring arms, and twelve-wing stirring arms; multiple sets of two-wing stirring arms are arranged in the middle section of the stirring main shaft; one set of four-wing stirring arms is arranged at the lower end of the stirring main shaft; and one set of twelve-wing stirring arms is arranged at the upper end of the stirring main shaft.

3. The aerobic fermentation equipment for sludge according to claim 2, characterized in that, The connection between the two-wing stirring arm and the stirring main shaft corresponds to the position of the hot oxygen discharge hole. Its wing plate is composed of an upper wing plate and a lower wing plate. A gap is left between the upper wing plate and the lower wing plate of the two-wing stirring arm to form an air duct. An opening is provided on one side of the air duct.

4. The sludge aerobic fermentation equipment according to claim 3, characterized in that, The wing plates of the four-wing stirring arm have the same structure as those of the two-wing stirring arm, and multiple scraper plates are spaced apart at the bottom of the lower wing plate.

5. The aerobic fermentation equipment for sludge according to claim 1, characterized in that, The base is provided with a discharge push arm that is rotatably connected to the stirring main shaft. The discharge push arm is provided with a discharge turntable that is rotatably connected to the stirring main shaft. The discharge turntable is provided with a plurality of discharge port baffles corresponding to the positions of the leakage trough.

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