A stirred tank anti-wall-sticking scraping wall stirring structure

Abstract

The utility model belongs to the technical field of stirring equipment, disclose a kind of wall scraping type stirring structure of anti-sticking wall of stirred tank, including stirred tank, stirring shaft driven by driving motor and main stirring blade, further including wall scraping assembly;Wall scraping assembly includes: suspension bracket, multiple link tubes are present on suspension bracket;Movable scraper bar, movable scraper bar and link tube are respectively corresponding, and movable scraper bar can be installed in link tube axially sliding, movable scraper bar is located at the radial outer end of suspension bracket;Reset elastic element, reset elastic element is installed between link tube and movable scraper bar;Side wall scraper, side wall scraper is installed on the end of movable scraper bar, and the bottom end of side wall scraper has bottom scraper.The utility model is through elastic reset element and cam impact mechanism, and scraper is closely attached kettle wall in radial dynamic expansion, both thoroughly remove adhering material, and also avoid the equipment wear and tear caused by rigid friction, simultaneously can significantly reduce wear rate and promote heat transfer efficiency.

Description

Technical Field

[0001] This utility model relates to the field of mixing equipment technology, and in particular to a non-stick wall scraping mixing structure for a mixing vessel. Background Technology

[0002] In stirred tanks (or reaction vessels), especially when processing high-viscosity, easily crystallizing, easily solidifying, or adhesive materials, the adhesion and sticking of materials to the inner wall of the vessel and the surface of the stirring components is a common and troublesome problem. The sticking phenomenon can lead to a series of adverse consequences: 1) Reduced heat transfer efficiency: The adhesive layer forms a heat insulation layer, which seriously affects the heating or cooling effect of the material in the vessel, resulting in increased energy consumption and inaccurate control of the reaction temperature. 2) Affects product quality: The material adhering to the wall may coke or denature due to long-term heating, which may mix into the product, leading to a decrease in product purity or even the production of substandard products. 3) Reduced effective volume: Adhesive materials occupy the effective reaction space, resulting in a reduction in the yield per batch.

[0003] Currently, common technical methods to solve the problem of material sticking to the vessel wall include: vessel wall jacket cooling: the material near the vessel wall is cooled rapidly to form a hard shell, which is then scraped off by an agitator. This method is energy-intensive and not suitable for some materials. Polishing the vessel wall: Reduces the surface roughness to reduce adhesion, but the effect is limited and cannot solve the fundamental problem; Installing a fixed scraper: A rigid scraper is installed on the stirring shaft and rotates with the shaft to scrape the vessel wall. However, it is difficult to precisely control the gap between the fixed scraper and the vessel wall. If the gap is too large, it will leave dead corners, and if the gap is too small, it will be easy to wear or even get stuck. Flexible scrapers are used: scrapers made of materials such as polytetrafluoroethylene rely on their elasticity to adhere to the wall, but they are prone to wear and aging after long-term use, requiring frequent replacement, and are not effective at cleaning hard scale layers. Therefore, we propose a non-stick wall scraping stirring structure for the mixing tank. Utility Model Content

[0004] In view of the problems existing in the above-mentioned technical means of solving the common problem of wall adhesion in the stirred tank, this utility model is proposed.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A non-stick wall scraping stirring structure for a mixing vessel includes a mixing vessel, a stirring shaft driven by a drive motor, and a main stirring blade, and also includes a wall scraping assembly rotatably mounted on the stirring shaft via a bearing assembly; The wall-mounted scraper assembly includes: a suspension bracket mounted on the stirring shaft via the bearing assembly, the suspension bracket having multiple connecting cylinders; A movable scraper bar, which corresponds to the connecting cylinder, and is axially slidably installed inside the connecting cylinder. The movable scraper bar is located at the radial outer end of the suspension bracket. A reset elastic element is installed between the connecting cylinder and the movable scraper; A side wall scraper is mounted on the end of the movable scraper, and the bottom end of the side wall scraper has a bottom scraper that is adapted to the contour of the inner wall of the bottom of the mixing vessel.

[0006] As a technical solution of the anti-sticking wall scraping stirring structure of the stirring tank described in this utility model, the wall scraping assembly further includes a transmission lever fixedly installed on the connecting cylinder, and a cam for periodically impacting the transmission lever is installed on the stirring shaft.

[0007] As a technical solution of the anti-sticking and scraping stirring structure of the stirring tank described in this utility model, the bearing assembly is a sliding bearing or a rolling bearing.

[0008] As a technical solution of the anti-sticking wall scraping stirring structure of the stirring tank described in this utility model, wherein: the inner wall of the connecting cylinder is provided with symmetrically arranged sliding grooves, and the outer surface of the contact end of the movable scraper and the connecting cylinder has integrally formed protrusions that correspond to the sliding grooves respectively, and the protrusions are adapted to the sliding grooves.

[0009] As a technical solution of the anti-sticking and scraping stirring structure of the stirring tank described in this utility model, the reset elastic element is a tension spring or a compression spring.

[0010] As a technical solution of the anti-sticking wall scraping stirring structure of the stirring tank described in this utility model, the working surface of the side wall scraper is made of wear-resistant and corrosion-resistant engineering plastic or composite material.

[0011] As a technical solution for the anti-sticking and scraping stirring structure of the stirring tank described in this utility model, the engineering plastic is ultra-high molecular weight polyethylene or filled polytetrafluoroethylene.

[0012] As a technical solution of the anti-sticking wall scraping stirring structure of the stirring tank described in this utility model, the bottom scraper is connected to the stirring shaft through an elastic connecting rod, and the elastic connecting rod includes a telescopic rod installed between the bottom scraper and the stirring shaft and a spring sleeved on the outer surface of the telescopic rod.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects: 1. This utility model, through the elastic reset element and cam impact mechanism, allows the scraper to closely adhere to the vessel wall during radial dynamic extension and contraction, which not only thoroughly removes adhering materials but also avoids equipment wear caused by hard friction, while significantly reducing wear rate and improving heat transfer efficiency.

[0014] 2. This utility model, through the combined design of side wall scrapers and bottom scrapers, covers the side wall and arc-shaped bottom of the mixing vessel, eliminating the cleaning dead corners of traditional scrapers. Combined with wear-resistant materials and anti-torsion structures, it can further ensure long-term stable operation, reduce the frequency of downtime maintenance, and significantly improve the utilization rate of the effective volume of a single batch. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram of the main structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the connection structure between the wall-mounted scraper assembly and the stirring shaft of this utility model.

[0017] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0018] Figure 4 This is a schematic diagram of the separation structure of the suspension bracket and the movable scraper arm of this utility model.

[0019] Explanation of reference numerals in the attached figures: In the diagram: 1. Stirring vessel; 2. Drive motor; 3. Stirring shaft; 4. Main stirring blade; 5. Bearing assembly; 6. Suspension bracket; 601. Connecting cylinder; 602. Slide groove; 7. Movable scraper; 701. Protrusion; 8. Reset elastic element; 9. Side wall scraper; 901. Bottom scraper; 10. Telescopic rod; 11. Spring; 12. Cam; 13. Transmission lever. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] Reference Figures 1-4A non-stick wall scraping stirring structure for a mixing vessel is provided. This non-stick wall scraping stirring structure includes a mixing vessel 1, a stirring shaft 3 driven by a drive motor 2, and a main stirring blade 4. It also includes a wall scraping assembly that is rotatably mounted on the stirring shaft 3 via a bearing assembly 5. The wall-mounted scraper assembly includes: a suspension bracket 6 mounted on the stirring shaft 3 via a bearing assembly 5, and the suspension bracket 6 having a plurality of connecting cylinders 601; The movable scraper 7 corresponds to the connecting cylinder 601, and the movable scraper 7 is axially slidably installed in the connecting cylinder 601. The movable scraper 7 is located at the radial outer end of the suspension bracket 6. The reset elastic element 8 is installed between the connecting cylinder 601 and the movable scraper 7. The side wall scraper 9 is installed on the end of the movable scraper 7. The bottom end of the side wall scraper 9 has a bottom scraper 901 that matches the contour of the bottom inner wall of the mixing vessel 1. In application, the design of the suspension bracket 6 and the movable scraper 7 allows the wall scraping assembly to rotate independently of the stirring shaft 3 through the bearing assembly 5, avoiding binding with the speed of the main stirring blade 4, and achieving targeted wall scraping. At the same time, the reset elastic element 8 pushes the movable scraper 7 to extend and retract radially, adapting to the deformation and wear of the vessel wall to maintain the tight fit of the side wall scraper 9. Combined with the bottom scraper 901 matching the contour of the vessel bottom, it can thoroughly remove residual materials in dead corners.

[0022] Reference Figure 2 The wall-mounted scraper assembly also includes a transmission lever 13 fixedly installed on the connecting cylinder 601. A cam 12 is installed on the stirring shaft 3 for periodically impacting the transmission lever 13. In application, the periodic impact scraping design causes the cam 12 to impact the transmission lever 13, driving the side wall scraper 9 to move radially momentarily, enhancing the peeling force on the hard scale layer and avoiding the problem of insufficient cleaning force of the flexible scraper.

[0023] Reference Figure 2 The bearing assembly 5 is a sliding bearing or a rolling bearing. In application, the wall scraping assembly is rotated independently of the stirring shaft 3 by the sliding bearing or the rolling bearing to achieve targeted wall scraping.

[0024] Reference Figures 2-4 The inner wall of the connecting cylinder 601 is provided with symmetrically arranged sliding grooves 602. The outer surface of the contact end of the movable scraper 7 and the connecting cylinder 601 has integrally formed protrusions 701 that correspond to the sliding grooves 602 respectively. The protrusions 701 and the sliding grooves 602 are adapted to each other. In application, the sliding grooves 602 and the protrusions 701 cooperate to restrict the circumferential rotation of the movable scraper 7, ensuring that the side wall scraper 9 only extends and retracts radially, thereby improving motion stability and extending service life.

[0025] Reference Figure 2 and Figure 4The reset elastic element 8 is a tension spring or a compression spring. In application, the reset elastic element 8 (tension spring / compression spring) pushes the movable scraper 7 to extend and retract radially, adapting to the deformation and wear of the vessel wall, so as to keep the movable scraper 7 in close contact.

[0026] Reference Figure 2 The working surface of the side wall scraper 9 is made of wear-resistant and corrosion-resistant engineering plastics or composite materials. The engineering plastics are ultra-high molecular weight polyethylene or filled polytetrafluoroethylene. In application, ultra-high molecular weight polyethylene or filled polytetrafluoroethylene materials resist chemical corrosion, reduce wear and aging, and extend the replacement cycle.

[0027] Reference Figure 2 The bottom scraper 901 is connected to the stirring shaft 3 via an elastic connecting rod. The elastic connecting rod includes a telescopic rod 10 installed between the bottom scraper 901 and the stirring shaft 3 and a spring 11 sleeved on the outer surface of the telescopic rod 10. In application, the elastic connecting rod of the telescopic rod 10 and the spring 11 enables the bottom scraper 901 to dynamically adapt to the uneven surface of the bottom of the vessel, avoiding jamming or missed scraping caused by rigid connection.

[0028] The working principle of this utility model is as follows: No-load debugging stage: First, start the drive motor 2 to run at low speed and observe whether the side wall scraper 9 is in uniform contact with the vessel wall. Then, adjust the pre-compression amount of the reset elastic element 8 to ensure that the pressure of the side wall scraper 9 against the wall is moderate (usually 0.2-0.5MPa). Finally, adjust the angle of the cam 12 so that it hits the transmission lever 13 once every one revolution, generating intermittent impact scraping. Production operation stage: First, after the material is injected into the mixing tank 1, the main stirring blade 4 mixes the material at the set speed and then scrapes normally. At this time, the movable scraper 7 continues to stick to the tank wall under the action of the reset elastic element 8 to remove the soft adhesive layer. At the same time, it impacts and scrapes. The cam 12 hits the transmission lever 13 to trigger the side wall scraper 9 to radially impact and peel off the hard scale. At the same time, the elastic connecting rod (telescopic rod 10, spring 11) pushes the bottom scraper 901 to float with the bottom contour of the tank to remove the deposited material. During shutdown maintenance: After running for a period of time, check the wear of the side wall scraper 9 (>2mm, it needs to be replaced), clean the residue in the slide groove 602, and replace the elastic element 8 when it fails due to fatigue (the extension stroke is reduced by 30%). At the same time, replenish the high-temperature grease of the bearing assembly 5 every quarter to avoid jamming.

[0029] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A stirring structure for preventing sticking and scraping the wall of a mixing vessel, comprising a mixing vessel (1), a stirring shaft (3) driven by a drive motor (2), and main stirring blades (4), characterized in that: It also includes a wall-mounted scraper assembly that is rotatably mounted on the stirring shaft (3) via a bearing assembly (5); The wall-mounted scraper assembly includes: a suspension bracket (6) mounted on the stirring shaft (3) via the bearing assembly (5), and the suspension bracket (6) has a plurality of connecting cylinders (601); The movable scraper (7) is respectively corresponding to the connecting cylinder (601), and the movable scraper (7) is axially slidably installed in the connecting cylinder (601). The movable scraper (7) is located at the radial outer end of the suspension bracket (6). A reset elastic element (8) is installed between the connecting cylinder (601) and the movable scraper (7); Side wall scraper (9), the side wall scraper (9) is installed on the end of the movable scraper (7), and the bottom end of the side wall scraper (9) has a bottom scraper (901) that is adapted to the contour of the bottom inner wall of the mixing vessel (1).

2. The anti-sticking and scraping stirring structure of the stirred tank according to claim 1, characterized in that: The wall-mounted scraper assembly also includes a transmission lever (13) fixedly installed on the connecting cylinder (601), and a cam (12) for periodically striking the transmission lever (13) is installed on the stirring shaft (3).

3. The anti-sticking and scraping stirring structure of the stirred tank according to claim 1, characterized in that: The bearing assembly (5) is a sliding bearing or a rolling bearing.

4. The anti-sticking and scraping stirring structure of the stirred tank according to claim 1, characterized in that: The inner wall of the connecting cylinder (601) is provided with symmetrically arranged sliding grooves (602). The outer surface of the contact end of the movable scraper (7) and the connecting cylinder (601) has integrally formed protrusions (701) that correspond to the sliding grooves (602). The protrusions (701) are adapted to the sliding grooves (602).

5. The anti-sticking and scraping stirring structure of the stirred tank according to claim 1, characterized in that: The reset elastic element (8) is a tension spring or a compression spring.

6. The anti-sticking and scraping stirring structure of the stirred tank according to claim 1, characterized in that: The working surface of the side wall scraper (9) is made of wear-resistant and corrosion-resistant engineering plastics or composite materials.

7. The anti-sticking and scraping stirring structure of the stirred tank according to claim 6, characterized in that: The engineering plastic is ultra-high molecular weight polyethylene or filled polytetrafluoroethylene.

8. The anti-sticking and scraping stirring structure of the stirred tank according to claim 1, characterized in that: The bottom scraper (901) is connected to the stirring shaft (3) via an elastic connecting rod. The elastic connecting rod includes a telescopic rod (10) installed between the bottom scraper (901) and the stirring shaft (3) and a spring (11) sleeved on the outer surface of the telescopic rod (10).

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