A scale-preventing scraper structure of an industrial wastewater low-temperature evaporation treatment device

Abstract

The utility model provides a kind of scale prevention scraper structure of industrial wastewater low-temperature evaporation treatment device belongs to scraper structure technical field, the scale prevention scraper structure of this industrial wastewater low-temperature evaporation treatment device is used to install on the inner wall of evaporation treatment cylinder, including scraper body and fixed base, scraper body has shaving part and transition part, the working end surface of shaving part is arc surface, the curvature radius of arc surface is compatible with the curvature radius of evaporation treatment cylinder inner wall, transition part is connected between shaving part and fixed base, wherein, the working end surface of shaving part is provided with multiple ridges along the radial direction of arc surface, when scraper body is shaved evaporation treatment cylinder inner wall, ridge and evaporation treatment cylinder inner wall are linear contact, the thickness of transition part gradually decreases along the direction from fixed base to shaving part, solve the problem that existing evaporation treatment cylinder inner wall scale is difficult to completely remove, heat conduction efficiency is low, energy consumption is high, frequent shutdown cleaning is needed.

Description

Technical Field

[0001] This utility model belongs to the field of scraper structure technology, specifically, it relates to an anti-scaling scraper structure for a low-temperature evaporation treatment device for industrial wastewater. Background Technology

[0002] Low-temperature evaporation treatment technology for industrial wastewater is a wastewater treatment method widely used in industries such as chemical, pharmaceutical, electroplating, and printing and dyeing in recent years. This technology utilizes a low-temperature negative pressure environment to evaporate wastewater at a lower temperature, separating water from dissolved solids, thereby achieving wastewater reduction and resource recovery. In practical applications, the core component of the evaporation treatment device is the evaporation cylinder. Wastewater evaporates inside the cylinder by heating the surface. However, various salts, heavy metal ions, and organic residues contained in the wastewater gradually reach a supersaturated state and precipitate during the evaporation and concentration process. These precipitates adhere to the inner wall surface of the evaporation cylinder, forming a scale layer. Existing technologies mainly use two methods to solve the scaling problem: chemical cleaning and mechanical scraping. Chemical cleaning involves periodically injecting acidic or alkaline cleaning agents into the evaporation cylinder to dissolve the scale. While chemical cleaning increases the cost of chemical agents, it also causes secondary pollution to the environment. Furthermore, chemical cleaning requires shutdown, disrupting production continuity. Mechanical scraping involves installing scraper devices on the inner wall of the evaporation tank to remove scale through mechanical action. Existing scraper structures often use simple flat or curved scrapers. These scrapers have surface contact with the scale, resulting in a large contact area, high driving force, and poor scraping effect. For firmly attached hard scale, only the loose surface portion is scraped away, leaving the interface between the scale and the tank wall difficult to break, leading to incomplete scale removal and repeated accumulation. Existing scrapers also suffer from fatigue fracture due to stress concentration during long-term use. The method of fixing the scraper to the tank wall is also inconvenient, requiring significant downtime for replacement and maintenance. Utility Model Content

[0003] In view of this, the present invention provides an anti-scaling scraper structure for a low-temperature evaporation treatment device for industrial wastewater, which solves the problems of difficult-to-remove scale buildup on the inner wall of the existing evaporation treatment cylinder, low heat transfer efficiency, high energy consumption, and the need for frequent shutdowns for cleaning.

[0004] This utility model is implemented as follows:

[0005] This utility model provides an anti-scaling scraper structure for a low-temperature evaporation treatment device for industrial wastewater, which is installed on the inner wall of the evaporation treatment cylinder. It includes a scraper body and a fixed base. The scraper body has a scraping section and a transition section. The working end face of the scraping section is an arc-shaped surface, and the radius of curvature of the arc-shaped surface matches the radius of curvature of the inner wall of the evaporation treatment cylinder. The transition section connects the scraping section and the fixed base. Multiple ridges are arranged on the working end face of the scraping section along the radial direction of the arc-shaped surface. The ridges extend axially along the evaporation treatment cylinder. When the scraper body scrapes the inner wall of the evaporation treatment cylinder, the ridges are in line contact with the inner wall. The thickness of the transition section gradually decreases from the fixed base towards the scraping section. The fixed base is bolted to the inner wall support frame of the evaporation treatment cylinder.

[0006] The technical effects of the anti-scaling scraper structure of the low-temperature evaporation treatment device for industrial wastewater provided by this utility model are as follows: By setting multiple convex ridges extending along the axial direction of the evaporation treatment cylinder on the working end face of the scraping part, the convex ridges make line contact with the inner wall of the evaporation treatment cylinder instead of surface contact when the scraper scrapes the inner wall. This line contact method can significantly improve the unit area pressure of the scraping part on the scale layer, thereby more effectively breaking the scale material attached to the inner wall of the evaporation treatment cylinder. At the same time, the gradually decreasing thickness of the transition part design gives the scraper body appropriate elastic deformation capability, which can better fit the slight unevenness of the inner wall of the evaporation treatment cylinder during the scraping process, ensuring the continuity and uniformity of the scraping effect.

[0007] Based on the above technical solution, the anti-scaling scraper structure of the low-temperature evaporation treatment device for industrial wastewater of this utility model can be further improved as follows:

[0008] The length of the convex ridge along the axial direction of the evaporation cylinder is greater than half the length of the scraping portion along the axial direction of the evaporation cylinder.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by limiting the length of the ridge along the axial direction of the evaporation treatment cylinder to be greater than half the length of the scraping part along this direction, it is ensured that the ridge occupies a sufficient effective working area on the working end face of the scraping part, so that the scraper can apply a continuous breaking force to the scale layer through the ridge throughout the entire working stroke, avoiding scraping blind spots caused by the ridge being too short. At the same time, this length ratio also ensures that the scraping part has sufficient structural strength when bearing working load, and will not deform or be damaged due to local stress concentration, thereby extending the service life of the scraper.

[0010] Furthermore, the connection between the working end face of the scraping part and the transition part forms an arc transition, and the radius of curvature of the arc transition is smaller than the radius of curvature of the working end face of the scraping part.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: forming a circular arc transition with a small radius of curvature at the connection between the working end face of the scraping part and the transition part can effectively avoid stress concentration at this connection position. This is because the scraper needs to withstand the reaction force from the scale layer and the supporting force from the inner wall of the evaporation treatment cylinder during operation. The action of these forces will generate a large bending moment in the connection area between the scraping part and the transition part. The circular arc transition design can make the stress distribution more uniform and prevent the scraper from developing fatigue cracks at this connection position during long-term use. At the same time, this transition structure also facilitates the smooth discharge of scale debris along the scraper surface, reducing debris accumulation.

[0012] Furthermore, the ridge is triangular in shape, and the apex of the ridge is an acute angle.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the ridge is designed as a triangular prism with an acute apex, so that the ridge can form a wedge-shaped cutting effect when it comes into contact with the scale layer. The acute apex can more easily insert into the interface between the scale layer and the inner wall of the evaporation treatment cylinder. The scale layer is peeled off from the inner wall surface through the wedge-shaped force. The triangular prism-shaped ridge can also split the scale layer during the scraping process, so that the thicker scale layer will crack along the ridge line and gradually break down. Compared with the arc-shaped or planar ridge structure, the triangular prism-shaped ridge has a stronger scale breaking ability and lower scraping resistance.

[0014] Furthermore, the multiple ridges on the working end face of the scraping part are evenly distributed, and the distance between two adjacent ridges is equal.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by making multiple ridges on the working end face of the scraping part evenly distributed and the distance between adjacent ridges equal, it is ensured that when the scraper scrapes the inner wall of the evaporation treatment cylinder, each ridge can apply a breaking force to the scale layer synchronously and evenly, avoiding the phenomenon of local over-scraping or under-scraping caused by uneven distribution of ridges. The evenly distributed ridges make the scraping part more balanced in force during operation, reducing the vibration and sway of the scraper body and improving the stability of the scraping operation. At the same time, the evenly spaced ridge arrangement also facilitates the collection and discharge of scale debris in the groove area between adjacent ridges.

[0016] Furthermore, the working end face area between two adjacent ridges is grooved, and the depth of the groove gradually increases from the fixed seat to the front end of the scraping part.

[0017] The beneficial effects of the above-mentioned improved scheme are as follows: In the groove-shaped area formed between two adjacent ridges, by designing the groove depth to gradually increase from the fixed seat to the front end of the scraping part, a channel is provided for guiding and discharging the scraped scale debris. The shallower groove at the beginning facilitates the initial collection of debris, while the gradually deepening groove structure uses gravity and the inertial force generated by the scraper movement to make the debris move along the groove towards the front end of the scraping part and eventually detach from the scraper surface. This gradient groove depth design effectively prevents the accumulation and secondary compaction of scale debris on the scraper surface, maintaining the continuous scraping ability of the ridges.

[0018] Furthermore, a through hole is provided at the geometric center of the fixed base, and a bolt is inserted into the through hole and connected to the threaded hole of the support frame on the inner wall of the evaporation treatment cylinder.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: By opening a through hole at the geometric center of the fixed seat and using bolts to connect with the threaded holes of the support frame inside the evaporation treatment cylinder, the scraper structure is reliably fixed inside the evaporation treatment cylinder. The bolt connection method not only provides sufficient connection strength to resist the reverse force generated during the scraping process, but also facilitates the installation, disassembly and maintenance of the scraper. When the scraper needs to be replaced due to wear from long-term use, the operator only needs to loosen the bolts to quickly complete the disassembly and assembly of the scraper. At the same time, the design of the through hole located at the geometric center of the fixed seat allows the bolt tightening force to be symmetrically and evenly distributed around the fixed seat, avoiding deformation caused by the eccentric force on the fixed seat.

[0020] Furthermore, the scraper body is made of stainless steel.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the scraper body is made of stainless steel, which makes full use of the corrosion resistance and high mechanical strength of stainless steel. Industrial wastewater still contains a variety of corrosive chemical components during the low-temperature evaporation process. Stainless steel can resist the chemical corrosion of these corrosive substances on the scraper, ensuring that the scraper will not rust or degrade in the long-term contact with wastewater environment. At the same time, the high strength of stainless steel allows the scraper to withstand a large scraping force without plastic deformation, maintain the geometric stability of the working end face of the scraping part, and extend the effective service life of the scraper.

[0022] Furthermore, the scraper body is an integrally formed plate structure, and the thickness of the scraper body remains uniform along the direction perpendicular to the axial direction of the evaporation treatment cylinder.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: designing the scraper body as a one-piece molded plate structure with uniform thickness along the direction perpendicular to the axial direction of the evaporation treatment cylinder eliminates the weak connection links that may exist in the multi-part assembly structure. The one-piece molded structure ensures that there are no welding seams or connection gaps between the various parts of the scraper body, avoiding the risk of fatigue failure of these parts under alternating loads. The uniform plate thickness design makes the stress distribution of the scraper body more reasonable when bearing scraping loads, and will not cause local stress concentration due to sudden changes in thickness. At the same time, the one-piece molded plate structure also simplifies the manufacturing process of the scraper and reduces production costs.

[0024] Furthermore, the ratio of the arc length of the arc surface of the working end face of the scraping part to the circumference of the inner wall of the evaporation treatment cylinder is 1 / 8 to 1 / 6, and the width of the connection between the transition part and the fixed seat is greater than the width of the connection between the transition part and the scraping part.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By limiting the ratio of the arc length of the arc surface of the working end face of the scraping part to the circumference of the inner wall of the evaporation treatment cylinder to one-eighth to one-sixth, and by designing the structure that the width of the connection between the transition part and the fixed seat is greater than the width of the connection with the scraping part, the optimal configuration of the scraper structure is achieved. The limitation of the arc length ratio ensures that the scraping part has sufficient working contact area to improve scraping efficiency, while avoiding the problem of excessive scraping resistance caused by excessive contact area. The gradient change design of the width of the transition part forms a load-bearing transition zone from the fixed seat to the scraping part, so that the supporting force transmitted from the fixed seat can be smoothly diffused to the scraping part, reducing stress concentration. At the same time, the wider connection of the fixed seat also provides a larger load-bearing area for bolt connection.

[0026] Compared with existing technologies, the beneficial effects of the anti-scaling scraper structure of the low-temperature evaporation treatment device for industrial wastewater provided by this utility model are as follows: This utility model changes the traditional surface contact between the scraper and the scale layer to a line contact by setting multiple convex ridge structures extending along the axial direction of the evaporation treatment cylinder on the working end face of the scraping part. This allows the convex ridges to apply concentrated breaking force to the scale layer during the scraping process, significantly improving the scraping pressure per unit area. This more effectively destroys the internal bonding force of the scale layer and the adhesion between the scale layer and the cylinder wall. The triangular prism-shaped acute-angled convex ridge design further enhances the ability to wedge into and split the scale layer. Combined with the groove structure with gradually varying depths between the convex ridges, it achieves efficient breaking of the scale layer and smooth discharge of debris. The gradual thickness design and arc transition structure of the transition part effectively disperse the working load. The design minimizes stress and prevents fatigue damage to the scraper during high-intensity scraping operations, extending its service life. The one-piece molded stainless steel plate structure ensures sufficient mechanical strength and corrosion resistance while eliminating weak points caused by multiple component connections. The bolt fixing method enables quick installation and replacement of the scraper, reducing maintenance costs. By reasonably limiting the ratio of the arc length of the scraping section to the circumference of the cylinder wall and the width gradient of the transition section, the scraper can maintain scraping efficiency while keeping scraping resistance and stress concentration within a reasonable range. Overall, compared with existing technologies, the scraper structure of this utility model can more thoroughly remove scale from the inner wall of the evaporation cylinder, reduce the frequency of downtime for cleaning, improve the continuous operation efficiency and heat transfer performance of the evaporation treatment device, and reduce energy consumption and operation and maintenance costs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model 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.

[0028] Figure 1 An example diagram of an anti-scaling scraper structure for a low-temperature evaporation treatment device for industrial wastewater;

[0029] Figure 2 A side view of the anti-scaling scraper structure of a low-temperature evaporation treatment device for industrial wastewater;

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 10. Scraper body; 11. Scraping section; 111. Ridge; 12. Transition section; 20. Fixing seat. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0033] like Figure 1 , Figure 2 The diagram shows an example of an anti-scaling scraper structure for a low-temperature evaporation treatment device for industrial wastewater provided by this utility model. It is used to install on the inner wall of an evaporation treatment cylinder and includes a scraper body 10 and a fixing seat 20. The scraper body 10 has a scraping section 11 and a transition section 12. The working end face of the scraping section 11 is an arc-shaped surface, and the radius of curvature of the arc-shaped surface is adapted to the radius of curvature of the inner wall of the evaporation treatment cylinder. The transition section 12 connects the scraping section 11 and the fixing seat 20. Multiple ridges 111 are provided on the working end face of the scraping section 11 along the radial direction of the arc-shaped surface. The ridges 111 extend axially along the evaporation treatment cylinder. When the scraper body 10 scrapes the inner wall of the evaporation treatment cylinder, the ridges 111 are in line contact with the inner wall of the evaporation treatment cylinder. The thickness of the transition section gradually decreases from the fixing seat 20 towards the scraping section 11. The fixing seat 20 is bolted to the inner wall support frame of the evaporation treatment cylinder.

[0034] The specific operation or usage method is as follows: Before putting the industrial wastewater low-temperature evaporation treatment device into operation, firstly, select a scraper structure with a suitable arc length according to the inner diameter of the evaporation treatment cylinder. Align the fixing seat of the scraper body with the support frame pre-welded to the inner wall of the evaporation treatment cylinder, ensuring that the through hole in the center of the fixing seat is aligned with the threaded hole on the support frame. Then, insert the bolts into the through hole of the fixing seat and screw them into the threaded hole of the support frame. Use a torque wrench to tighten the bolts to the specified torque value, ensuring that the scraper body is firmly fixed to the inner wall of the evaporation treatment cylinder. Depending on the circumference of the evaporation treatment cylinder, it is usually necessary to evenly install 3 to 4 sets of scraper structures inside the cylinder wall. The working end face of the scraping part of each set of scrapers should maintain appropriate contact pressure with the inner surface of the cylinder wall. After installation, start the evaporation treatment device. Wastewater enters the evaporation treatment cylinder and is heated. Evaporation begins at the bottom. As the evaporation process progresses, scale gradually forms on the inner surface of the cylinder wall. Since the evaporation cylinder usually rotates slowly during operation or is equipped with a rotating scraper drive mechanism, the working end face of the scraping part of the scraper will periodically contact the inner surface of the cylinder wall. When in contact, the ridges apply a concentrated breaking force to the scale layer in a line contact manner, scraping the scale layer off the cylinder wall. The scraped scale debris falls into the collection area at the bottom of the evaporation cylinder and is periodically removed by the slag discharge device. Throughout the evaporation process, the scraper continuously plays a role in preventing and removing scale, reducing the cumulative thickness of the scale layer on the cylinder wall. When the evaporation unit needs to be shut down for maintenance or the scraper needs to be replaced due to wear, the operator can simply loosen the fixing bolts to remove the old scraper and install the new scraper in the same way. The entire replacement process is simple and quick.

[0035] In the above technical solution, the length of the convex ridge along the axial direction of the evaporation tube is greater than half the length of the scraping part 11 along the axial direction of the evaporation tube.

[0036] Furthermore, in the above technical solution, the connection between the working end face of the scraping part 11 and the transition part 12 forms an arc transition, and the radius of curvature of the arc transition is smaller than the radius of curvature of the working end face of the scraping part 11.

[0037] Furthermore, in the above technical solution, the ridge 111 is triangular in shape, and the apex of the ridge 111 is an acute angle.

[0038] Furthermore, in the above technical solution, multiple ridges 111 on the working end face of the scraping part 11 are evenly distributed, and the distance between two adjacent ridges 111 is equal.

[0039] Furthermore, in the above technical solution, the working end face area between two adjacent ridges 111 is groove-shaped, and the depth of the groove gradually increases from the fixed seat 20 to the front end of the scraping part 11.

[0040] Furthermore, in the above technical solution, a through hole is provided at the geometric center of the fixed base 20, and the bolt is inserted into the through hole and connected to the threaded hole of the support frame on the inner wall of the evaporation treatment cylinder.

[0041] Furthermore, in the above technical solution, the scraper body 10 is made of stainless steel.

[0042] Furthermore, in the above technical solution, the scraper body 10 is an integrally formed plate structure, and the thickness of the scraper body 10 remains uniform along the direction perpendicular to the axial direction of the evaporation treatment cylinder.

[0043] Furthermore, in the above technical solution, the ratio of the arc length of the arc surface of the working end face of the scraping part 11 to the circumference of the inner wall of the evaporation treatment cylinder is 1 / 8 to 1 / 6, and the width of the connection between the transition part 12 and the fixed seat 20 is greater than the width of the connection between the transition part 12 and the scraping part.

[0044] Specific Embodiment 1: In this embodiment, the scraper body is integrally processed from a 5mm thick 304 stainless steel plate through laser cutting and bending. The working end face of the scraping part is arc-shaped, with a radius of curvature of 1500mm, which matches the curvature of the inner wall of the evaporation cylinder with an inner diameter of 3000mm. The length of the scraping part along the axial direction of the evaporation cylinder is 200mm, and the height along the radial direction is 80mm. Five ridges are evenly distributed along the axial direction on the working end face of the scraping part. The cross-section of each ridge is an isosceles triangle with a vertex angle of 60 degrees, a base width of 6mm, a height of 3mm, and a center distance between two adjacent ridges of 4mm. The ridge extends 120mm axially, which is greater than half the axial length of the scraping part. A groove is formed on the working end face between adjacent ridges. The groove is 1mm deep near the fixed seat and gradually deepens to 2.5mm towards the front end of the scraping part. A transition section connects the scraping part and the fixed seat. Its thickness gradually decreases from 5mm at the fixed seat connection to 3mm at the scraping part connection. The length of the transition section is 60mm. An arc transition with a radius of 8mm is provided at the connection between the transition section and the scraping part, which is smaller than the radius of curvature of the working end face of the scraping part. The fixed seat is a rectangular plate structure, 100mm long and 80mm wide. The thickness is maintained at 5mm. A 12mm diameter through hole is drilled at the geometric center of the fixing seat for inserting an M10 bolt. The arc length of the working end face of the scraper is 400mm. The ratio of this arc length to the circumference of the inner wall of the evaporation treatment cylinder (9420mm) is approximately one-twenty-fourth. In practical applications, this ratio can be adjusted to between one-eighth and one-sixth depending on the size of the treatment cylinder. The width of the transition section at the connection with the fixing seat is 80mm, and the width at the connection with the scraper is 60mm, presenting a gradually changing width structure. In this embodiment, the scraper structure is installed in a low-temperature evaporation device for treating industrial electroplating wastewater. This device operates at a temperature of 55 to 65 degrees Celsius and a negative 0.0°C. Operating under vacuum conditions of 8 to -0.09 MPa, the wastewater contains copper, nickel, and chromium ions, as well as various salts. During evaporation, these substances form a hard scale layer on the cylinder wall. This scraper structure applies concentrated breaking force to the scale layer through line contact with the convex ridges. The acute apex of the triangular prism convex ridge can insert into the bottom of the scale layer and produce a wedge-shaped prying effect, effectively breaking the bond between the scale layer and the cylinder wall. The gradually deepening grooves between the convex ridges provide a discharge channel for debris. The gradually changing thickness and arc transition structure of the transition section ensure uniform stress distribution and avoid fatigue fracture. The stainless steel material resists the corrosion of the wastewater, maintaining the stability of the scraper performance. The bolt fixing method allows for quick disassembly and assembly, facilitating maintenance and replacement.

[0045] Example 2: This Example 2 is based on Example 1. The number of ridges on the working end face of the scraper is increased to 7, the center distance between adjacent ridges is reduced to 30mm, the apex angle of the triangular cross-section of each ridge is adjusted to 45 degrees to make the apex angle sharper and enhance the penetration ability of the scale layer, the height of the ridge is increased to 4mm, the bottom width is kept at 6mm, and the depth gradient of the groove between adjacent ridges is also adjusted accordingly. The depth near the fixed seat end is 1.5mm, and it gradually deepens to 3mm towards the front end of the scraper. This adjustment is suitable for treating industrial wastewater containing high concentrations of silicates and carbonates. The scale layer formed by this type of wastewater during evaporation is harder and has stronger adhesion. The increased number of ridges and the sharper apex angle can provide a denser and stronger scale-breaking force, and the deeper groove can accommodate and discharge more scale debris. The rest of the structure is consistent with Example 1, and it shows a better descaling effect in the treatment of silicate-containing wastewater.

[0046] Specifically, the principle of this invention is as follows: By changing the contact method between the scraper blade and the scale layer, the traditional surface contact is changed to line contact. Multiple ridges extending axially along the evaporation cylinder are set on the working end face of the scraper blade. These ridges make line contact with the scale layer during scraping, concentrating the scraping force on the contact line between the ridges and the scale layer. According to the principle that pressure equals force divided by the contact area, line contact has a smaller contact area than surface contact, and can generate greater pressure under the same scraping force. This concentrated pressure effectively overcomes the cohesive force of the scale layer and the adhesion force between the scale layer and the cylinder wall, causing the scale layer to peel off from the cylinder wall surface. The ridges are designed as triangular prisms with acute apex angles, utilizing the mechanical properties of a wedge. Under the scraping force, the acute apex angle can insert like a wedge into the interface between the scale layer and the cylinder wall, prying the scale layer off the cylinder wall through the opening action of the wedge shape. The inclined surface can also apply a splitting force to the scale layer, causing the scale layer to crack and break into small pieces along the extension direction of the ridge. Multiple ridges are evenly distributed on the working end face of the scraping part, so that the scraping force can be evenly applied to different positions of the cylinder wall, avoiding local overload. At the same time, the groove formed between adjacent ridges provides space for scale debris to be contained and discharged. The gradual design of the groove depth utilizes the dynamic effect generated by gravity and scraper movement, so that the debris can automatically move along the groove to the front end of the scraping part and detach from the scraper. The gradual thickness of the transition part and the arc transition structure are based on the stress flow line theory, so that the support reaction force transmitted from the fixed seat can be smoothly transferred to the scraping part, avoiding stress concentration at local abrupt section. The one-piece plate structure eliminates the stress concentration source at the connection part. Combined with the high strength and corrosion resistance of stainless steel, it ensures the long-term reliability of the scraper under corrosive environment and alternating load.

Claims

1. A scale-preventing scraper structure for a low-temperature evaporation treatment device for industrial wastewater, used for installation on the inner wall of an evaporation treatment cylinder, comprising a scraper body and a fixing seat, the scraper body having a scraping section and a transition section, the working end face of the scraping section being an arc-shaped surface, the radius of curvature of the arc-shaped surface being adapted to the radius of curvature of the inner wall of the evaporation treatment cylinder, and the transition section connecting the scraping section and the fixing seat, characterized in that... The working end face of the scraping part is provided with multiple ridges along the radial direction of the arc surface. The ridges extend along the axial direction of the evaporation tube. When the scraper body scrapes the inner wall of the evaporation tube, the ridges are in line contact with the inner wall of the evaporation tube. The thickness of the transition part gradually decreases from the fixed seat to the scraping part. The fixed seat is connected to the inner wall support frame of the evaporation tube by bolts.

2. The anti-scaling scraper structure of the low-temperature evaporation treatment device for industrial wastewater according to claim 1, characterized in that, The length of the convex ridge along the axial direction of the evaporation tube is greater than half the length of the scraping part along the axial direction of the evaporation tube.

3. The anti-scaling scraper structure of the low-temperature evaporation treatment device for industrial wastewater according to claim 2, characterized in that, The connection between the working end face of the scraping part and the transition part forms an arc transition, and the radius of curvature of the arc transition is smaller than the radius of curvature of the working end face of the scraping part.

4. The anti-scaling scraper structure of the low-temperature evaporation treatment device for industrial wastewater according to claim 3, characterized in that, The ridge is triangular in shape, with an acute angle at its apex.

5. The anti-scaling scraper structure of the low-temperature evaporation treatment device for industrial wastewater according to claim 4, characterized in that, The working end face of the scraping part has multiple ridges that are evenly distributed, and the distance between two adjacent ridges is equal.

6. The anti-scaling scraper structure of the low-temperature evaporation treatment device for industrial wastewater according to claim 5, characterized in that, The working end face area between two adjacent ridges is groove-shaped, and the depth of the groove gradually increases from the fixed seat to the front end of the scraping part.

7. The anti-scaling scraper structure of the low-temperature evaporation treatment device for industrial wastewater according to claim 6, characterized in that, The fixed base has a through hole at its geometric center, and the bolt is inserted into the through hole and connected to the threaded hole of the support frame on the inner wall of the evaporation treatment cylinder.

8. The anti-scaling scraper structure of the low-temperature evaporation treatment device for industrial wastewater according to claim 7, characterized in that, The scraper body is made of stainless steel.

9. The anti-scaling scraper structure of the low-temperature evaporation treatment device for industrial wastewater according to claim 8, characterized in that, The scraper body is a one-piece molded plate structure, and the thickness of the scraper body is kept uniform along the direction perpendicular to the axial direction of the evaporation treatment cylinder.

10. The anti-scaling scraper structure of the low-temperature evaporation treatment device for industrial wastewater according to claim 9, characterized in that, The ratio of the arc length of the arc surface of the working end face of the scraping part to the circumference of the inner wall of the evaporation treatment cylinder is 1 / 8 to 1 / 6, and the width of the connection between the transition part and the fixed seat is greater than the width of the connection between the transition part and the scraping part.

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