Blade-adjustable stirring tank and control method thereof

Abstract

The application discloses a paddle-adjustable stirring tank and a control method thereof, which comprises a stirring tank body and a tank cover, wherein an ultrasonic control device is arranged in the tank cover, a control motor is arranged on the top of the tank cover, a paddle-adjustable stirring shaft is arranged in the stirring tank body, the paddle-adjustable stirring shaft is in transmission connection with the control motor, a group of paddles are arranged on the paddle-adjustable stirring shaft, and the group of paddles can be moved axially on the paddle-adjustable stirring shaft. The paddle-adjustable stirring shaft and an ultrasonic transceiver are arranged, the initial liquid height is judged according to the solution reflection signal received by the ultrasonic transceiver, the paddle is moved with the aid of a sliding motor, and the mixing effect of the multiple layers of paddles is fully utilized; during the stirring process, the stirring process is monitored based on the echo signal, the control motor and the adjustable paddle are regulated and controlled, and the stirring process is intelligently optimized.

Description

Technical Field

[0001] This invention relates to the field of chemical equipment, and in particular to an adjustable impeller stirred tank and its control method. Background Technology

[0002] A stirred tank is a mixing device that combines mechanical stirring with liquid contact. It functions to heat, cool, stir, and mix, and is widely used in small and medium-sized chemical enterprises. Studies show that over 50% of chemical processes are batch operations carried out in stirred reactors. To achieve optimal mixing, large stirred tanks often employ multi-layer impellers to improve stirring efficiency. Currently, however, most multi-layer impellers are fixed to the stirring shaft, preventing adjustment of impeller positions based on reactant quantities. This limits the full potential of the multi-layer impeller's stirring capacity, and the lack of real-time monitoring hinders intelligent control of the stirring process.

[0003] Based on the above analysis, the problems and defects of the existing technology are as follows: the existing stirred tank lacks a working structure that adjusts the blade height according to the amount of reactants. In addition, it also lacks a control system to regulate the stirring process. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing an adjustable impeller stirring vessel and its control method.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions:

[0006] An adjustable impeller stirring vessel includes a vessel body and a vessel cover. An ultrasonic control device is installed inside the vessel cover, and a control motor is installed on the top of the vessel cover. An adjustable impeller stirring shaft is installed inside the vessel body, and the adjustable impeller stirring shaft is drivenly connected to the control motor. A set of impellers is provided on the adjustable impeller stirring shaft, and the set of impellers can move axially on the adjustable impeller stirring shaft.

[0007] Furthermore, the ultrasonic control device includes ultrasonic transceivers located on both sides of the inner wall of the vessel lid.

[0008] Furthermore, the outer wall of the adjustable stirring shaft is provided with a sliding groove along the axial direction, and is slidably connected to the blade through the sliding groove.

[0009] Furthermore, the blade includes a blade ring, a replaceable blade, a sliding motor, and a telescopic limiter; the replaceable blade is fixed to the blade ring with bolts, the sliding motor and the telescopic limiter are respectively disposed on the inner wall of the blade ring, the blade ring is connected to the sliding groove through the sliding motor to achieve free movement, and is positioned by the telescopic limiter; the telescopic limiter includes a telescopic shaft, a telescopic motor, and a bracket, the telescopic shaft and the bracket are fixed with bolts to form a telescopic bracket, the telescopic bracket is fixedly connected to the telescopic motor, and the extension degree is adjusted by the telescopic motor.

[0010] Furthermore, the ultrasonic transceiver is cylindrical and vertically downward, and is fixed on a mounting frame, which is fixed to the top of the vessel lid by bolts.

[0011] Furthermore, the ultrasonic transceiver includes an ultrasonic receiver and an ultrasonic generator. The ultrasonic receiver is placed horizontally to receive ultrasonic signals reflected from the solution, determine the actual liquid level, and perform initial adjustment of the impeller height. The ultrasonic generator probe is adjustable and, based on the Doppler effect of sound waves, adjusts the ultrasonic transmission frequency f. e With echo signal f r Frequency difference, Doppler shift f d And the Doppler angle θ, to obtain the particle velocity u in the solution. p ;

[0012]

[0013] Furthermore, the ultrasonic transceiver feeds back the ultrasonic signals during the stirring process to the control motor and the sliding motor, and adjusts the motor parameters according to the bubble velocity and particle distribution information in the solution.

[0014] Furthermore, the blade also includes a cleaning slider, which is mounted on a sliding motor and moves with the assistance of the sliding motor to remove particles adhering to the sliding groove.

[0015] Furthermore, it also includes a signal processing module, which is electrically connected to the ultrasonic control device, the control motor, and the sliding motor.

[0016] A control method for an adjustable impeller-type stirred tank includes the following steps:

[0017] 1) Add reactants into the stirred tank. The ultrasonic transceiver sends an ultrasonic signal. The actual liquid height is obtained based on the liquid surface reflection signal. The sliding motor built into the impeller ring is driven to adjust the impeller height according to the liquid height. After reaching the designated position, the telescopic limiter extends to fix the impeller.

[0018] 2) During the stirring process in the stirred tank, the ultrasonic generator emits ultrasonic signals. Based on the reflected signals received by the ultrasonic receiver from the solution, the signal processing module obtains information on the movement of bubbles and the distribution of particles in the working fluid, which is then fed back to the control motor and the sliding motor to adjust the parameters of each motor.

[0019] 3) Blade reset: The cleaning slider cleans the particles adhering in the sliding groove with the assistance of the sliding motor (during the blade reset process, the blade moves throughout the entire process, the upper blade first reaches the top to the middle and then resets, the lower blade reaches the bottom to the middle and then resets, completing one cleaning process).

[0020] Compared with existing technologies, the advantages of this invention are:

[0021] 1) This invention is equipped with an adjustable impeller stirring shaft and an ultrasonic transceiver. The initial liquid level is determined by the solution reflection signal received by the ultrasonic transceiver. The impeller is moved by a sliding motor to make full use of the mixing effect of the multi-layer impeller.

[0022] 2) This invention is equipped with an adjustable ultrasonic transceiver probe. Based on the ultrasonic Doppler effect, it obtains information such as the velocity of bubbles and the distribution of particles in the solution. Through linkage with the control motor, it intelligently regulates the stirring process and optimizes the stirring process.

[0023] 3) The present invention divides the blade into two parts: the blade ring and the replaceable blade. The blade ring is connected to the sliding groove of the stirring shaft through a sliding motor to achieve free movement. The ring has a built-in cleaning slider to clean any particles that may adhere to it in the sliding groove, thus achieving self-cleaning of the adjustable stirring shaft. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0025] Figure 2 This is a cross-sectional view of the present invention;

[0026] Figure 3 These are exploded views of the various structures of the present invention;

[0027] Figure 4 This is a schematic diagram of the ultrasonic control device;

[0028] Figure 5 This is a schematic diagram of the structure of an adjustable impeller stirring shaft;

[0029] Figure 6 This is a schematic diagram of the blade installation structure;

[0030] Figure 7 This is a schematic diagram of the blade structure;

[0031] Figure 8 This is a schematic diagram of the internal structure of the blade;

[0032] Figure 9 This is a schematic diagram of the vessel lid;

[0033] Figure 10 This is an enlarged schematic diagram of the telescopic limiter structure;

[0034] Figure 11 This is a schematic diagram of the ultrasonic monitoring function of the present invention;

[0035] Figure 12 This is a schematic diagram of the ultrasonic control device of the present invention;

[0036] Figure 13 This is a schematic diagram of the control flow of the present invention;

[0037] In the diagram: 1. Control motor; 2. Cauldron lid; 3. Feed cover; 4. Adjustable stirring shaft with paddles; 5. Paddle; 6. Cauldron body; 7. Ultrasonic transceiver; 201. Reducer base; 202. Feed inlet; 401. Connecting shaft; 402. Sliding groove; 501. Paddle ring; 502. Replaceable paddle; 5011. Sliding motor; 5012. Cleaning slider; 5013. Telescopic limiter; 50131. Holder; 50132. Telescopic shaft; 50133. Telescopic motor; 701. Ultrasonic generator; 702. Ultrasonic receiver. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings.

[0039] like Figure 1 , 9 As shown, an adjustable impeller mixing vessel includes a control motor 1, a vessel cover 2, and a vessel body 6; the vessel cover 2 is disposed on the vessel body 6, the control motor 1 is disposed on a reducer base 201 on the top of the vessel cover 2, and the top of the vessel cover 2 is also provided with a feed inlet 202.

[0040] like Figure 2 , 3 As shown, the top of the vessel cover 2 is equipped with an ultrasonic control device, and the vessel body is equipped with an adjustable impeller shaft 4 and impellers set on the adjustable impeller shaft 4; the adjustable impeller shaft 4 is connected to the control motor 1 for transmission and is used to control the speed and direction of the impeller shaft; the feed inlet 202 is equipped with a feed cover 3.

[0041] like Figure 4 , 11 As shown in Figure 12, the ultrasonic control device includes ultrasonic transceivers installed on both sides of the top of the lid 2, which adjust the stirring process based on the echo signal; the ultrasonic transceiver includes an ultrasonic generator 701 and an ultrasonic receiver 702.

[0042] The ultrasonic transceiver 7 is cylindrical and vertically downward. There are two ultrasonic transceivers, which are fixed on the mounting bracket. The mounting bracket is fixed to the top of the vessel lid by bolts. In the initial stage, the receiver is placed flat to receive the ultrasonic signal reflected by the solution, determine the actual liquid level, and make initial adjustments to the blade height.

[0043] The 701 ultrasonic generator probe is adjustable, based on the Doppler effect of sound waves, and according to the ultrasonic emission frequency (f... e ) and echo signal (f r The frequency difference (Doppler shift f) d The velocity of the particles in the solution can be obtained from the Doppler angle θ (the angle between the direction of ultrasonic propagation and the direction of particle motion) and the Doppler angle θ (the angle between the direction of ultrasonic propagation and the direction of particle motion). p ).

[0044]

[0045] The ultrasonic transceiver 7 feeds back the ultrasonic signal during the stirring process to the control motor 1, and adjusts the speed and direction of the stirring shaft 4 according to information such as the speed of bubbles and particle distribution in the solution.

[0046] like Figure 5 As shown, the connecting shaft 401 of the adjustable impeller stirring shaft 4 has a sliding groove 402 along the axial direction, which is directly connected to the sliding motor 5011 inside the impeller ring. The impeller moves according to the ultrasonic signal to adapt to the working conditions. Three impellers 5 are installed on the connecting shaft 401. The bottom impeller is fixed and the other two can move freely on the sliding groove.

[0047] like Figure 6 , 7 As shown in Figure 8, the blade 5 includes a blade ring 501 and a replaceable blade 502. The replaceable blade 502 is fixed to the blade ring 501 by bolts and can be replaced according to the actual use. The blade ring 501 has three built-in parts: a cleaning slider 5012, a sliding motor 5011, and a telescopic limiter 5013 (these three parts are a modular design). The cleaning slider 5012 is set in front of and behind the sliding motor 5011. It moves with the assistance of the sliding motor 5011 to remove the particles attached to the sliding groove. The blade 5 is fixed in the appropriate position by the telescopic limiter 5013.

[0048] like Figure 10 As shown, the telescopic limiter 5013 includes a telescopic shaft 50132, a telescopic motor 50133, and a bracket 50131; the telescopic shaft and the bracket are fixed by bolts to form a telescopic bracket, and the telescopic bracket is fixedly connected to the telescopic motor (the telescopic motor 50133 is connected to the telescopic shaft 50132), and the extension degree of the shaft is adjusted by the motor.

[0049] like Figure 13As shown, the operation of this stirred tank can be divided into three stages. In the first stage, reactants are added to the stirred tank, and the ultrasonic transceiver 7 emits ultrasonic signals. The actual liquid height is determined based on the reflected signals from the liquid surface. The sliding motor 5011, built into the impeller ring 501, adjusts the impeller height according to the liquid height. Once the designated position is reached, the telescopic limiter 5013 extends to fix the impeller. In the second stage, during the stirring process, the ultrasonic generator 701 emits ultrasonic signals. Based on the reflected signals received from the solution by the ultrasonic receiver 702, the signal processing module obtains information such as bubble movement and particle distribution within the working fluid. This information is fed back to the control motor 1 and the sliding motor 5011 to adjust parameters such as rotation speed, direction, and slurry height. In the final stage, during the impeller reset process, the cleaning slider 5012, assisted by the sliding motor, cleans the particles adhering to the sliding tank. This invention monitors the stirring process based on echo signals, controls the motor and adjustable impeller, and intelligently optimizes the stirring process.

Claims

1. A paddle-adjustable stirring vessel, comprising a vessel body and a vessel lid, characterized in that, The inside of the vessel lid is equipped with an ultrasonic control device, and the top of the vessel lid is equipped with a control motor. The inside of the vessel body is equipped with an adjustable impeller stirring shaft, and the adjustable impeller stirring shaft is connected to the control motor. The adjustable impeller stirring shaft is equipped with a set of impellers, and the set of impellers can move axially on the adjustable impeller stirring shaft. The ultrasonic control device includes ultrasonic transceivers located on both sides of the inner wall of the vessel lid. The outer wall of the adjustable stirring shaft is provided with a sliding groove along the axial direction, and is slidably connected to the blade through the sliding groove; The propeller includes a propeller ring, replaceable propeller blades, a sliding motor, and a telescopic limiter. The replaceable propeller blades are fixed to the propeller ring with bolts. The sliding motor and the telescopic limiter are respectively disposed on the inner wall of the propeller ring. The propeller ring is connected to a sliding groove via the sliding motor to achieve free movement and is positioned by the telescopic limiter. The telescopic limiter includes a telescopic shaft, a telescopic motor, and a bracket. The telescopic shaft and the bracket are fixed with bolts to form a telescopic bracket. The telescopic bracket is fixedly connected to the telescopic motor, and the extension degree is adjusted by the telescopic motor. The ultrasonic transceiver includes an ultrasonic receiver and an ultrasonic generator. The ultrasonic receiver is placed horizontally to receive ultrasonic signals reflected from the solution, determine the actual liquid level, and perform initial adjustment of the impeller height. The ultrasonic generator probe is adjustable and, based on the Doppler effect of sound waves, adjusts the ultrasonic transmission frequency. With echo signal Frequency difference, Doppler shift and Doppler angle The velocity of particles in the solution is obtained. ; ； The ultrasonic transceiver feeds back the ultrasonic signals during the stirring process to the control motor and the sliding motor, and adjusts the motor parameters according to the bubble velocity and particle distribution information in the solution. The blade also includes a cleaning slider, which is mounted on a sliding motor and moves with the assistance of the sliding motor to remove particles adhering to the sliding groove.

2. The adjustable impeller stirring vessel according to claim 1, characterized in that, The ultrasonic transceiver is cylindrical and vertically downward. It is fixed on a mounting frame, which is then fixed to the top of the vessel lid with bolts.

3. The adjustable impeller stirring vessel according to claim 1, characterized in that, It also includes a signal processing module, which is electrically connected to the ultrasonic control device, the control motor, and the sliding motor.

4. The control method for an adjustable impeller stirred tank according to any one of claims 1-3, characterized in that, Includes the following steps: 1) Add reactants into the stirred tank. The ultrasonic transceiver emits an ultrasonic signal. The actual liquid height is obtained based on the liquid surface reflection signal. The signal processing module drives the sliding motor built into the blade ring to adjust the blade height according to the liquid height. After reaching the designated position, the telescopic limiter extends to fix the blade. 2) During the stirring process in the stirred tank, the ultrasonic generator emits ultrasonic signals. Based on the reflected signals received by the ultrasonic receiver from the solution, the signal processing module obtains information on the movement of bubbles and the distribution of particles in the working fluid, which is then fed back to the control motor and the sliding motor to adjust the parameters of each motor. 3) During the blade reset process, the cleaning slider cleans the particles adhering in the sliding groove with the assistance of the sliding motor.

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