An assembled biogas slurry storage tank

Abstract

The utility model relates to the technical field of biogas slurry storage tank, concretely to an assembly type biogas slurry storage tank, including tank body and the foundation that supports it, the bottom of tank body includes bottom plate and sets up the locking plate of first taper surface, the top surface of foundation is set up and installs the groove, and the rubber pad is equipped in the groove bottom surface, the tank body is installed in the groove through locking assembly, locking assembly includes drive part and execution part, and the execution end of execution part is equipped with the second taper surface with the cooperation of first taper surface, and drive part drives execution part and moves along the radial of groove, still including wind speed sensor and controller, and wind speed sensor and drive part electric connection with controller, and according to feedback signal control drive part action. Through the change of wind speed sensing, automatically switch between initial locking force and maximum locking force, make tank body in 99% normal working time in the friendly state of lower load, greatly prolong the life of equipment, only in 1% extreme risk period can instantaneously improve to maximum locking state.

Description

Technical Field

[0001] This utility model relates to the technical field of biogas slurry storage tanks, specifically a prefabricated biogas slurry storage tank. Background Technology

[0002] Prefabricated biogas slurry storage tanks, as core facilities in biogas projects, play a crucial role in storing anaerobic fermentation residues. Compared to traditional reinforced concrete structures or geomembrane ponds, these storage devices, assembled from prefabricated components, offer significant advantages such as shorter construction cycles, reusability, and strong adaptability, thus finding widespread application in modern biogas projects. However, existing prefabricated biogas slurry storage tanks suffer from serious design flaws in their foundation connection methods, particularly highlighting reliability issues under dynamic load conditions.

[0003] Currently, bolts are commonly used to rigidly fix the tank bottom plate to the concrete foundation. During operation, the locking force of the tank is generally in a fixed state. However, the design of locking force that is not adjustable or cannot be automatically adjusted is prone to connection failure under strong wind conditions, which poses a serious safety hazard.

[0004] To address these issues, existing designs often employ over-design solutions in engineering practice: increasing the number of bolts, enlarging bolt sizes, and upgrading material grades to enhance connection strength. This design approach not only significantly increases material costs and construction complexity but, more importantly, subjects the connection system to unnecessary overload for most of its normal operating time. This results in the foundation, tank, and connectors enduring excessively high stresses over extended periods, accelerating material fatigue and stress corrosion. This design contradiction severely restricts the safety and economic efficiency of prefabricated biogas slurry storage tanks. Utility Model Content

[0005] The purpose of this invention is to provide a prefabricated biogas slurry storage tank that automatically adjusts the locking force according to the ambient wind force to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A prefabricated biogas slurry storage tank includes a tank body and a matching foundation. The bottom of the tank body includes a bottom plate and an annular locking plate extending outward from the bottom plate. The upper end surface of the locking plate is provided with a first conical surface. An installation groove is provided on the top surface of the foundation, and a rubber pad is provided on the bottom surface of the installation groove; The bottom of the tank is located in the mounting groove and is locked in place by a locking assembly; At least three sets of locking components are evenly arranged along the side wall of the mounting groove. Each locking component includes a driving part and an execution part. The execution end of the execution part is provided with a second conical surface that mates with the first conical surface. The driving part drives the execution part to move radially along the mounting groove. It also includes a wind speed sensor and controller for detecting ambient wind speed; The controller is electrically connected to the wind speed sensor and the drive unit, and controls the drive unit to start operating based on the signal fed back by the wind speed sensor, and controls the drive unit to stop operating based on the signal fed back by the drive unit.

[0007] Preferably, the angle between the first conical surface and the horizontal plane is 15 to 25 degrees.

[0008] Preferably, the drive unit is an electric push rod; The controller receives a current signal from the electric actuator.

[0009] Preferably, the electric push rod has a built-in absolute position encoder and is electrically connected to the controller, which stores preset initial position coordinates. The controller is configured to, when the value continuously measured by the wind speed sensor within a certain period of time is less than a set start-up threshold, control the output end of the electric actuator to retract, and, based on the real-time position information fed back by the absolute position encoder, stop the output end of the electric actuator at the initial position coordinates. Preferably, the actuator is a slider, which is slidably disposed in a slide rail preset in the side wall of the mounting groove. One end of the slider is connected to the drive unit through a floating joint, and the other end is provided with a second conical surface.

[0010] Preferably, the slide rail is a V-shaped slide rail.

[0011] Preferably, the mounting groove is provided with a limiting step, and the lower end face of the limiting step is in contact with the bottom surface of the mounting groove; The rubber pad is fitted with the limiting step with a clearance. The limiting step is configured to limit the maximum downward movement of the bottom of the tank to ensure that the maximum compression of the rubber pad is within its elastic limit.

[0012] Compared with the prior art, the beneficial effects of this utility model are: By sensing changes in wind speed, the system automatically switches between initial and maximum locking force, transforming passive protection into active defense. At the same time, it abandons the "over-design" approach, with the system operating in a low-load friendly state for 99% of normal working time, greatly extending the equipment's lifespan; it only instantly increases to the maximum locking state during the 1% of extreme risk periods. Attached Figure Description

[0013] Figure 1 A schematic diagram of the overall structure of this utility model; Figure 2 An exploded view of the structure of this utility model; Figure 3 A schematic diagram of the basic exploded structure of this utility model; Figure 4 This utility model shows the internal structure of the foundation after it has been cut open (in the initial position). Figure 5 An exploded view of the locking assembly in this utility model; Figure 6 A cross-sectional view of this utility model (initial position state); Figure 7 A cross-sectional view of this utility model (maximum locking force state).

[0014] In the diagram: 1. Tank body; 11. Bottom plate; 12. Locking plate; 2. Foundation; 21. Mounting groove; 22. Rubber pad; 23. Locking assembly; 231. Electric push rod; 232. Floating joint; 233. Slider; 234. Slide rail; 24. Limiting step; 3. Mounting plate; 4. Wind speed sensor. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] This utility model provides a technical solution: To address the problems raised in the background section, it is first necessary to break through the traditional static constraint mode of bolt fixing and establish a dynamic locking mechanism. Analysis of load variation patterns reveals that wind speed is the key variable inducing overturning moment. Based on this, it is considered to link locking force adjustment with wind speed monitoring to form a closed-loop control system. Further research into the force transmission path reveals the use of a conical mating structure to convert radial displacement into axial clamping force, achieving automatic adjustment of the locking force. Ultimately, a ring constraint system is constructed using multiple sets of synchronously driven locking units. This allows for operation with a relatively small conventional locking force under normal wind conditions, while automatically adjusting to the maximum locking force under strong wind conditions to ensure the stability of the tank.

[0017] See Figure 1 and Figure 2This application proposes a prefabricated biogas slurry storage tank, including a tank body 1 and a matching foundation 2. The foundation 2 is made of reinforced concrete, and an installation groove 21 is prefabricated on the upper surface of the foundation 2. The bottom of the tank body 1 is fitted with the installation groove 21 with a clearance and is embedded in the installation groove 21. The bottom of the tank body 1 includes a bottom plate 11 and an annular locking plate 12. The bottom plate 11, the wall plate, and the top cover constitute a sealed space for storing biogas slurry. The bottom plate 11 extends outward to form an annular locking plate 12. The bottom surface of the locking plate 12 is on the same plane as the bottom surface of the bottom plate 11. The outer edge of the upper end face of the locking plate 12 tapers to form a first conical surface. See Figure 2 , Figure 3 and Figure 5 At least three sets of locking components 23 are arranged along the side wall of the mounting groove 21, and are arranged in a circular pattern at equal angles. Each set of locking components 23 includes a drive unit and an actuator. The drive unit is a power output component used to drive the actuator to move radially along the mounting groove 21. The drive unit can be an existing drive device that can provide controllable, linear, and sufficiently large thrust, and has precise position control capabilities, such as an electric push rod, pneumatic telescopic rod, hydraulic cylinder, linear motor, ball screw module, or gear rack mechanism. In this embodiment, the drive unit is an electric push rod 231, which is mounted on the side wall of the foundation 2 via a mounting plate 3. The actuator is a slider 233, which can be made of surface-hardened alloy steel. The slider 233 and the mounting plate 231 are mounted on the side wall of the foundation 2. The slide rail 234, mounted on the side wall of the groove, is slidably fitted and has a low coefficient of friction on its contact surface. The slide rail 234 is a V-shaped cross-section linear slide rail to ensure its linearity during operation to the greatest extent. One end of the slider 233 is connected to the output end of the electric push rod 231 through the floating joint 232, and the other end is provided with a second conical surface. The second conical surface and the first conical surface form a conical surface fit. The angle between the first conical surface and the second conical surface and the horizontal plane is set to 15 degrees to 25 degrees. Within this range, factors such as the locking force amplification factor and the self-locking condition are taken into account. While meeting the appropriate locking force amplification factor, it can be ensured that the first conical surface and the second conical surface will not self-lock. When the electric push rod 231 retracts, the bottom of the tank 1 can be smoothly reset under the restoring force of the rubber pad 22.

[0018] A wind speed sensor 4 is installed on the top of the tank 1 to measure the real-time wind speed. To avoid the influence of the tank 1 itself on the wind speed measurement, the wind speed sensor 4 is installed on an independent weather rod. The weather rod is 2-3 meters above the highest point of the tank top. The wind speed sensor 4 can be an ultrasonic wind speed sensor such as the Gill Instruments MaxiMet GMX200 series product. It is also equipped with a controller, which is a programmable logic controller (PLC), such as a Siemens S7-1200. The controller is electrically connected to the wind speed sensor 4 and the drive unit. The controller receives the real-time wind speed data measured by the wind speed sensor 4 and compares it with a preset start-up threshold (e.g., 15 m / s). If the wind speed is greater than the preset start-up threshold, a signal is sent to control the electric push rod 231 to move, driving the slider 233 to move radially. The second cone surface drives the first cone surface to squeeze the rubber pad 22 to increase the locking force. During the movement of the electric push rod 231, the controller receives the current value signal of the electric push rod 231 in real time. The current value is compared with the preset stop threshold in the controller. If it is equal to the stop threshold or within a certain error range compared with the stop threshold, the controller sends a signal to control the electric push rod 231 to stop moving. The locking force reaches the designed maximum locking force and is maintained. In this way, based on the data measured by the wind speed sensor 4 and the data fed back after the electric push rod 231 moves, the locking force of the tank 1 is switched from the initial normal state to the maximum locking force state to cope with strong winds, realizing the automatic adjustment of the locking force. The stop threshold is the current of the electric push rod 231 when it is working in the maximum locking force state. Its value is determined in advance through experiments and set in the controller.

[0019] In this embodiment, the controller is also electrically connected to an absolute position encoder to control the electric actuator 231 to drive the slider 233 back to the initial position after the strong wind condition is relieved. The absolute position encoder is built into the electric actuator 231, but it can also be externally installed. The layout of the absolute position encoder is not limited. The controller communicates with the absolute position encoder built into the electric actuator 231. The controller stores preset initial position coordinates. If the value continuously measured by the wind speed sensor 4 is below the activation threshold within a certain period of time, such as 10 minutes, the risk is determined to be relieved. The controller then controls the output end of the electric actuator 231 to retract and stops the output end of the electric actuator 231 at the initial position coordinate based on the real-time position information fed back by the absolute position encoder, waiting for the next cycle. The position is precisely controlled by the absolute position encoder, which is existing knowledge of the operation of the electric actuator 231. The initial position mentioned here (see...) Figure 6 ) refers to a coordinate used to control the position of the electric push rod 231 during the installation of the storage tank. At this position, the slider 233, in conjunction with the rubber pad 22, generates a preset locking force to lock the locking plate 12. This locking force matches the requirements for stable operation of the storage tank under normal conditions. The calibration of the initial position is explained in detail below.

[0020] See Figure 4In this embodiment, a limiting step 24 is provided in the mounting groove 21, which is fixedly connected to the nut preset on the bottom surface of the mounting groove 21 by bolts. Its height is determined according to the natural height of the rubber pad 22 and the maximum elastic deformation of the rubber pad 22. The rubber pad 22 is laid on the bottom surface of the mounting groove 21 and maintains a gap of 1-5 mm between it and the inner wall of the limiting step 24. This is achieved by controlling the diameter of the rubber pad 22 to be smaller than the inner diameter of the limiting step 24. This gap provides space for the elastic deformation of the rubber pad 22.

[0021] In strong winds, the electric push rod 231 pushes the slider 233, which drives the bottom of the tank 1 to move downwards and compress the rubber pad 22 until the locking plate 12 at the bottom of the tank 1 abuts against the limiting step 24. The top surface of the limiting step 24 contacts the locking plate to form a rigid block, at which point the locking force reaches its maximum value (e.g., Figure 7 As shown, the rubber pad 22 assists in supporting the tank bottom plate 11, and the limiting step 24 prevents the tank body 1 from moving further downward through physical limiting, ensuring that the rubber pad 22 is always within the elastic working range. This rigid-flexible coupling mechanism, on the one hand, achieves relative locking of the tank body 1 through the cooperation of the slider 233 and the rubber pad 22 under normal wind conditions, i.e., when the slider 233 is in the initial position; on the other hand, the limiting step 24 prevents plastic deformation of the rubber pad 22 through displacement constraint.

[0022] Using this utility model: 1. Initial installation: First, complete the assembly of the bottom of tank 1 and the bottom wall panel. Then, hoist the assembled bottom of tank 1 and the bottom wall panel and slowly lower them into the installation groove 21. Adjust the bottom of tank 1 so that the bottom of tank 1 is coaxial with the installation groove 21. Then, remove the hoisting device and press down the bottom of tank 1 with the hydraulic device until the first conical surface of the locking plate is opposite to the second conical surface of the slider 233. 2. Initial position calibration: a. The controller starts the initialization program and controls the electric push rod 231 to slowly push the slider 233 radially inward at a low speed, with the second cone surface acting on the first cone surface; the controller monitors the motor operating current of the electric push rod 231 in real time. b. When the motor operating current is detected to reach the stop threshold, the controller determines that the locking plate has abutted against the limit step 24 and immediately stops the electric push rod 231. c. The controller sets the location of this stop point as the zero point of the position coordinates and records it in its non-volatile memory; d. Subsequently, the controller controls the electric push rod 231 to retract by a preset fixed stroke s and stop at this position. This position is the preset initial position, and the controller also records this coordinate. In this initial position, the rubber pad 22 is compressed to the designed preload, thereby providing the system with a predetermined initial locking force, and the locking plate maintains a certain gap with the limiting step 24.

[0023] 3. Working process: During operation, under normal wind conditions, slider 233 is in the initial position, locking tank 1 with initial locking force. When the wind speed sensor 4 measures a wind force greater than the preset opening threshold, electric push rod 231 is activated. The first conical surface of slider 233 drives the second conical surface of locking plate to move the bottom of tank 1 down and compress rubber pad 22 until the current value fed back by electric push rod 231 reaches the preset stop threshold, at which point the action of electric push rod 231 is immediately stopped. At this time, the locking force reaches its maximum value, thereby preventing tank 1 from tipping over.

[0024] 4. Reset: If the value continuously measured by the wind speed sensor 4 is below the start threshold within a certain period of time, such as 10 minutes, the risk is determined to be eliminated, the output end of the electric push rod 231 is controlled to retract, and the electric push rod 231 is stopped at the initial position coordinate based on the real-time position information fed back by the absolute position encoder, waiting for the next cycle.

[0025] 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 prefabricated biogas slurry storage tank, comprising a tank body (1) and a matching foundation (2), characterized in that, The bottom of the tank (1) includes a bottom plate (11) and an annular locking plate (12) extending outward from the bottom plate (11). The upper end surface of the locking plate (12) is provided with a first conical surface. An installation groove (21) is provided on the top surface of the foundation (2), and a rubber pad (22) is provided on the bottom surface of the installation groove (21). The bottom of the tank (1) is located in the mounting groove (21) and locked by the locking assembly (23); At least three sets of locking components (23) are evenly arranged along the side wall of the mounting groove (21). The locking components (23) include a driving part and an execution part. The execution end of the execution part is provided with a second conical surface that cooperates with the first conical surface. The driving part drives the execution part to move radially along the mounting groove (21). It also includes a wind speed sensor (4) for detecting ambient wind speed and a controller; The controller is electrically connected to the wind speed sensor (4) and the drive unit, and controls the drive unit to start operating according to the signal fed back by the wind speed sensor (4), and controls the drive unit to stop operating according to the signal fed back by the drive unit.

2. The prefabricated biogas slurry storage tank according to claim 1, characterized in that, The angle between the first conical surface and the horizontal plane is 15 to 25 degrees.

3. The prefabricated biogas slurry storage tank according to claim 1, characterized in that, The drive unit is an electric push rod (231). The controller receives a current signal from the electric push rod (231).

4. A prefabricated biogas slurry storage tank according to claim 3, characterized in that, The electric push rod (231) has a built-in absolute position encoder and is electrically connected to the controller, which stores the preset initial position coordinates. The controller is configured to control the output end of the electric push rod (231) to retract when the value continuously measured by the wind speed sensor (4) within a certain period of time is less than the set start threshold, and to stop the output end of the electric push rod (231) at the initial position coordinate based on the real-time position information fed back by the absolute position encoder.

5. A prefabricated biogas slurry storage tank according to claim 1, characterized in that, The actuator is a slider (233), which is slidably disposed in a slide rail (234) preset in the side wall of the mounting groove (21). One end of the slider (233) is connected to the drive unit through a floating joint (232), and the other end is provided with a second conical surface.

6. A prefabricated biogas slurry storage tank according to claim 5, characterized in that, The slide rail (234) is a V-shaped slide rail (234).

7. A prefabricated biogas slurry storage tank according to claim 1, characterized in that, The mounting groove (21) is provided with a limiting step (24), and the lower end face of the limiting step (24) is in contact with the bottom surface of the mounting groove (21); The rubber pad (22) and the limiting step (24) are fitted with a clearance. The limiting step (24) is configured to limit the maximum downward movement of the bottom of the tank (1) to ensure that the maximum compression of the rubber pad (22) is within its elastic limit.

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