A device for treating waste water from furfural processing

Abstract

The application discloses a kind of furfural processing wastewater treatment devices, including neutralization tank, stirring motor, stirring shaft, outer sleeve shaft, multiple groups of blades, shaft coupling assembly and multiple groups of scraping components, the neutralization tank is used to load furfural wastewater and carry out neutralization;The stirring motor is located at the top of neutralization tank;The stirring shaft is installed in the inside of neutralization tank, and is arranged out of the top end of neutralization tank;The outer sleeve shaft is installed in the inside of neutralization tank, and is arranged out of the top end of neutralization tank, the outer sleeve shaft is sleeved on the outside of stirring shaft, and there is gap between the outer sleeve shaft and stirring shaft;The blade is arranged below stirring shaft;The shaft coupling assembly is installed at the output end of stirring motor, the shaft coupling assembly is used to drive stirring shaft to rotate alone or drive stirring shaft and outer sleeve shaft to rotate together;The scraping component is installed between outer sleeve shaft and blade, and the scraping component is used to clean the scale of blade surface.The application realizes two-axis cooperation by single driver to solve the problem of calcium salt adhesion on the surface of blade.

Description

Technical Field

[0001] This invention relates to the field of furfural processing technology, and more particularly to a wastewater treatment device for furfural processing. Background Technology

[0002] In furfural wastewater treatment systems, the neutralization tank is a key piece of equipment for adjusting the pH value of the wastewater, and its operational stability directly affects the subsequent process effects and the equipment's service life. During actual operation, organic matter and salts contained in the wastewater, under the action of stirring and neutralization reaction after the addition of a neutralizing agent, are easily adsorbed and deposited on the inner wall, stirring blades, and bottom of the tank. Furthermore, the neutralizing agent is usually calcium hydroxide, which, when neutralized with the sulfuric acid present in the furfural wastewater, produces calcium sulfate, i.e., calcium salts.

[0003] As operating time increases, the calcium sulfate adsorbed layer gradually thickens, especially when it accumulates on the agitator blades, affecting the impeller's dynamic balance and agitation efficiency, causing uneven mixing in certain areas. Excessive deposits at the bottom of the tank can clog the drain port, affecting the normal emptying of the tank. More seriously, these deposits will gradually harden under prolonged drying or high-temperature environments, forming a dense scale layer. This hardened scale layer is not only difficult to remove by conventional cleaning methods, but it also forms a potential difference or absorbing layer on the tank surface. When an uneven scale layer forms on the inner wall of the tank, an oxygen concentration cell will form between the scale-covered area and the exposed metal surface. The oxygen concentration under the scale is low, acting as the anode, and metal dissolution corrosion occurs; the oxygen concentration at the scale edge or in the exposed area is high, acting as the cathode. This potential-driven electrochemical corrosion process continues, leading to localized pitting or cratering of the under-scale metal, especially severe at microscopic defects such as welds and scratches, directly affecting the structural safety and service life of the tank. Because scale contains hydrophilic substances such as inorganic salts, when the ambient humidity is high or the tank wall temperature is below the dew point, the scale will absorb moisture from the air or residual wastewater, forming a wet film containing electrolytes between the scale and the metal interface. This electrolyte solution provides the necessary ion conduction channels for electrochemical corrosion, allowing the corrosion reaction to continue and further accelerating the damage process on the metal surface.

[0004] Therefore, how to provide a wastewater treatment device for furfural processing is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] One object of the present invention is to provide a wastewater treatment device for furfural processing. The invention includes a neutralization tank, a stirring motor, a stirring shaft, an outer shaft, multiple sets of blades, a coupling assembly, and multiple sets of scraping assemblies. The neutralization tank is used to hold furfural wastewater for neutralization. The stirring motor is located at the top of the neutralization tank. The stirring shaft is installed inside the neutralization tank and extends out of the top of the tank. The outer shaft is installed inside the neutralization tank and extends out of the top of the tank, and is sleeved on the outside of the stirring shaft with a gap between them. The blades are located below the stirring shaft. The coupling assembly is installed at the output end of the stirring motor and is used to drive the stirring shaft to rotate independently or to drive the stirring shaft and the outer shaft to rotate together. The scraping assemblies are installed between the outer shaft and the blades and are used to clean scale buildup on the blades.

[0006] Preferably, the coupling assembly includes an outer shaft linkage part and an inner shaft linkage part. The outer shaft linkage part has a first transmission member, a second transmission member, and an intermediate connecting member. The first transmission member is connected to the output end of the stirring motor, the second transmission member is connected to the outer sleeve shaft, and the intermediate connecting member is used to transmit power between the first transmission member and the second transmission member and to keep the rotation direction and rotation speed of the first transmission member and the second transmission member consistent.

[0007] Preferably, the inner shaft linkage includes a shaft head coupling, which has upper and lower halves. The upper half of the shaft head coupling slides on the output end of the stirring motor. A set of bearings is respectively installed on the outer side of the upper and lower halves of the shaft head coupling. A permanent magnet is provided on the outer side of the bearings installed on the upper half, and an electromagnet is provided on the outer side of the bearings installed on the lower half. Multiple sets of springs are provided between the permanent magnet and the electromagnet.

[0008] Preferably, the gap between the stirring shaft and the outer sleeve shaft is filled with multiple sets of self-lubricating bearings. The outer sleeve shaft has an upper sleeve and a lower sleeve. The bottom outer wall of the lower sleeve is provided with an external thread groove. The external thread groove has a number of thread turns and a total thread length.

[0009] Preferably, the scraping assembly includes a scraper block, which is sleeved on the outside of the blade. A sliding outer ring is sleeved on the outside of the lower bushing. The inner wall of the sliding outer ring has an outer ring thread groove, which fits into each other. A transmission bar is provided between the sliding outer ring and the scraper block. The transmission bar is hinged to the scraper block and the sliding outer ring by a pin.

[0010] Preferably, the blade is an inclined strip structure, the transmission strip is arranged perpendicularly to the blade in the same direction, and the transmission strip is vertically hinged to the scraper block.

[0011] Preferably, the upper bushing and the lower bushing are connected by a flange and bolts, and the inner diameter of the upper bushing is larger than that of the lower bushing. The inner wall of the lower bushing is provided with an internal thread groove, which also has a number of thread turns and a total thread length. The number of thread turns of the internal thread groove is the same as that of the external thread groove, and the total thread length of the internal thread groove is greater than that of the external thread groove.

[0012] Preferably, the outer wall of the stirring shaft is provided with multiple sets of sliding grooves, each sliding groove having an upper and lower opening. The two ends of the lower opening of the sliding groove have flanges near the outer wall. The two ends of the upper opening of the sliding groove maintain a consistent distance from the outer wall. The upper opening of the sliding groove is not lower than the top of the lower shaft sleeve. A limiting block is installed on the outer side of the top flange of the lower opening of the sliding groove by bolts.

[0013] Preferably, the outer side of the stirring shaft is equipped with multiple sets of descaling components. Each descaling component includes a threaded block, the outer thread of which engages with the inner threaded groove. The inner side of the threaded block is provided with a sliding block, which slides against the sliding groove. A steel rope is provided at the bottom of the threaded block, and a steel brush is provided at the end of the steel rope away from the threaded block. The length of the steel rope is not less than the distance from the blade to the bottom of the inner wall of the neutralization tank.

[0014] Preferably, the descaling components are all arranged away from the blades, the upper and lower ends of the sliding block are both arc-shaped structures, the steel brush has a counterweight inside, and the stirring shaft is made of solid anti-corrosion material.

[0015] The beneficial effects of this invention are:

[0016] This invention achieves rotational control between two shafts through a coupling assembly, solving the problems of high installation costs and excessive space requirements for multiple drivers.

[0017] The scraping component and outer sleeve shaft work together to clean the calcium salts adhering to the blades, reducing the risk of corrosion after the blades are coated with the salts and avoiding the problem of uneven blade surfaces after coating, which can easily cause cavitation during the stirring process, thus improving the service life of the blades.

[0018] By combining the descaling component with the stirring shaft and outer shaft, the problem of calcium salts or neutralizing agent settling at the bottom of the neutralization tank's inner wall is solved, reducing the accumulation of deposits on the bottom wall of the neutralization tank and also reducing the risk of blockage in the outlet pipe. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a wastewater treatment device for furfural processing proposed in this invention;

[0021] Figure 2 This is a cross-sectional schematic diagram of a wastewater treatment device for furfural processing proposed in this invention.

[0022] Figure 3 This is a schematic diagram of the internal structure of a wastewater treatment device for furfural processing proposed in this invention.

[0023] Figure 4 This is an exploded view of the stirring motor and coupling assembly proposed in this invention;

[0024] Figure 5 This is an exploded view of the inner shaft linkage part proposed in this invention;

[0025] Figure 6 This is an exploded view of the shaft coupling proposed in this invention;

[0026] Figure 7 This is an exploded view of the stirring shaft and outer sleeve shaft proposed in this invention;

[0027] Figure 8 This is a schematic diagram of the scraping component structure proposed in this invention;

[0028] Figure 9 This is a schematic diagram of the descaling component structure proposed in this invention;

[0029] Figure 10 This is a cross-sectional schematic diagram of the internal structure of a wastewater treatment device for furfural processing proposed in this invention.

[0030] In the picture: 1. Neutralization tank;

[0031] 2. Agitator motor;

[0032] 3. Coupling assembly; 31. Outer shaft linkage part; 311. First transmission component; 312. Second transmission component; 313. Intermediate connecting component; 32. Inner shaft linkage part; 321. Shaft head coupling; 3211. Soft pad; 322. Bearing; 323. Permanent magnet; 324. Electromagnet; 325. Spring;

[0033] 4. Stirring shaft; 41. Sliding groove; 42. Limiting block;

[0034] 5. Outer sleeve; 51. Upper sleeve; 52. Lower sleeve; 521. External threaded groove; 522. Internal threaded groove;

[0035] 6. Leaves;

[0036] 7. Scraping assembly; 71. Scraping block; 72. Drive bar; 73. Sliding outer ring; 74. Outer ring threaded groove;

[0037] 8. Outlet pipeline;

[0038] 9. Scale removal components; 91. Threaded block; 92. Sliding block; 93. Steel rope; 94. Steel brush. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0040] refer to Figure 1-3 The system includes a neutralization tank 1, a stirring motor 2, a coupling assembly 3, a stirring shaft 4, an outer shaft 5, three sets of blades 6, three sets of scraping assemblies 7, and an outlet pipe 8. The neutralization tank 1 is used to hold and neutralize furfural wastewater. The stirring motor 2 is located at the top of the neutralization tank 1 and drives the internal structure for stirring. The stirring motor 2 is preferably a servo motor and can record the rotation position. The coupling assembly 3 is installed at the output end of the stirring motor 2 and drives the stirring shaft 4 to rotate independently or to rotate the stirring shaft 4 and the outer shaft 5 together. The stirring shaft 4 is installed inside the neutralization tank 1 and extends beyond the top of the tank. The stirring shaft 4 drives the three sets of blades 6 to rotate and stir the furfural wastewater inside the neutralization tank 1. The outer shaft 5 is installed on the neutralization tank... The inner side of the neutralization tank 1 and extending through the top of the neutralization tank 1, the outer sleeve shaft 5 is sleeved on the outer side of the stirring shaft 4, and there is a gap between the outer sleeve shaft 5 and the stirring shaft 4. The gap between the stirring shaft 4 and the outer sleeve shaft 5 is filled with multiple sets of self-lubricating bearings. The outer sleeve shaft 5 is used to drive the scraping assembly 7 to operate so that the scale on the surface of the blade 6 can be removed. The blade 6 is located below the stirring shaft 4. The blade 6 has an inclined strip structure. The blade 6 is used to stir the furfural wastewater and added calcium hydroxide inside the neutralization tank 1. The scraping assembly 7 is installed between the outer sleeve shaft 5 and the blade 6. The scraping assembly 7 is used to clean the scale on the surface of the blade 6. The outlet pipe 8 is located at the bottom of the neutralization tank 1. The outlet pipe 8 is used to discharge the impurities generated by the neutralization reaction or the furfural wastewater that has been neutralized and can be processed to the next step.

[0041] The specific structure is as follows:

[0042] refer to Figure 4The coupling assembly 3 includes an outer shaft linkage part 31 and an inner shaft linkage part 32. The outer shaft linkage part 31 has a first transmission member 311, a second transmission member 312, and an intermediate connecting member 313. The first transmission member 311 is connected to the output end of the stirring motor 2, the second transmission member 312 is connected to the outer sleeve shaft 5, and the intermediate connecting member 313 is used to transmit power between the first transmission member 311 and the second transmission member 312 and keep the rotation direction and rotation speed of the first transmission member 311 and the second transmission member 312 consistent. Preferably, the outer shaft linkage part 31 can transmit power through a gear set, that is, the first transmission member 311 and the second transmission member 312 use the same helical gears, and the intermediate connecting member 313 meshes with the first transmission member 311 and the second transmission member 312 through two sets of helical gears respectively. The two sets of helical gears of the intermediate connecting member 313 do not contact each other. Each helical gear of the intermediate connecting member 313 is followed by a spur gear coaxially mounted. The two spur gears are the same and mesh, thereby achieving the effect of consistent rotation direction and rotation speed between the first transmission member 311 and the second transmission member 312.

[0043] refer to Figure 5-6 The inner shaft linkage 32 includes a shaft head coupling 321, a bearing 322, a permanent magnet 323, an electromagnet 324, and multiple sets of springs 325. The shaft head coupling 321 has upper and lower halves. The upper half of the shaft head coupling 321 slides on the output end of the stirring motor 2. A set of bearings 322 is installed on the outer side of the upper and lower halves of the shaft head coupling 321, respectively. A permanent magnet 323 is installed on the outer side of the bearing 322 installed on the upper half, and an electromagnet 324 is installed on the outer side of the bearing 322 installed on the lower half. Multiple sets of springs 325 are connected between the permanent magnet 323 and the electromagnet 324. The electromagnet 324 is wired to avoid the outer shaft linkage 31. Each protrusion on the upper and lower halves of the shaft head coupling 321 is provided with a soft pad 3211, and there is a gap between the soft pads 3211 of the upper and lower halves. Preferably, the upper shaft coupling 321, bearing 322 and permanent magnet 323 and the lower shaft coupling 321, bearing 322 and electromagnet 324 can be fixedly connected by each having a housing, and the spring 325 is fixed to the housing.

[0044] refer to Figure 7 The outer sleeve 5 has an upper sleeve 51 and a lower sleeve 52. The bottom outer wall of the lower sleeve 52 is provided with an external thread groove 521, which has the number of thread turns and the total thread length.

[0045] refer to Figure 8The scraping assembly 7 includes a scraper block 71, which is sleeved on the outside of the blade 6. A sliding outer ring 73 is sleeved on the outside of the lower bushing 52. The inner wall of the sliding outer ring 73 has an outer ring threaded groove 74, which fits into the outer ring threaded groove 521. A transmission bar 72 is provided between the sliding outer ring 73 and the scraper block 71. The transmission bar 72 is perpendicular to the blade 6 in the same direction. The transmission bar 72 is hinged to the scraper block 71 and the sliding outer ring 73 by a pin. The transmission bar 72 is perpendicularly hinged to the scraper block 71. The transmission bar 72 has a bend on the side near the scraper block 71. At the moment of starting when the stirring shaft 4 rotates and drives the sliding outer ring 73 to move downward, the transmission bar 72 is subjected to the downward pressure of the sliding outer ring 73. At this time, the bend makes it easier for the scraper block 71 to move away from the stirring shaft 4.

[0046] In addition to calcium salts or other substances being generated on the blade surface due to the neutralization reaction and adsorbed there, other locations inside the neutralization tank 1 are also prone to adsorption, such as the bottom of the inner wall of the neutralization tank 1. Therefore, the following structure is provided for cleaning.

[0047] refer to Figure 7 The upper bushing 51 and the lower bushing 52 are connected by a flange and bolts. The inner diameter of the upper bushing 51 is larger than that of the lower bushing 52. The inner wall of the lower bushing 52 is provided with an internal thread groove 522. The internal thread groove 522 also has a number of thread turns and a total thread length. The number of thread turns in the internal thread groove 522 is the same as that in the external thread groove 521. The total thread length of the internal thread groove 522 is greater than that of the external thread groove 521. That is, when the outer bushing 5 rotates, the sliding outer ring 73 installed on the external thread groove 521 moves downward by one unit length, and the component installed on the internal thread groove 522 moves downward by a distance greater than one unit length.

[0048] refer to Figure 7 The stirring shaft 4 is made of solid corrosion-resistant material. The outer wall of the stirring shaft 4 is provided with three sets of sliding grooves 41. The sliding groove 41 has upper and lower openings. The two ends of the lower opening of the sliding groove 41 have flanges near the outer wall. The two ends of the upper opening of the sliding groove 41 are spaced at the same distance from the outer wall. The upper opening of the sliding groove 41 is not lower than the top of the lower shaft sleeve 52. The outer side of the top flange of the lower opening of the sliding groove 41 is equipped with a limiting block 42 by bolts.

[0049] refer to Figure 9-10Three sets of descaling components 9 are installed on the outer side of the stirring shaft 4. Each descaling component 9 is positioned away from the blades 6. Each descaling component 9 includes a threaded block 91, the threads on the outer side of which engage with the threads of the inner threaded groove 522. A sliding block 92 is located inside the threaded block 91, with both its upper and lower ends having an arc-shaped structure. The sliding block 92 slides against the sliding groove 41. A steel rope 93 is located at the bottom of the threaded block 91, and a steel brush 94 is located at the end of the steel rope 93 away from the threaded block 91. A counterweight is located inside the steel brush 94. The length of the steel rope 93 is not less than the distance from the blades 6 to the bottom of the inner wall of the neutralization tank 1. The weight of the stirring shaft 4 prevents the friction on the outer shaft 5 from causing the stirring shaft 4 to rotate.

[0050] When installing the descaling component 9, first insert the sliding block 92 into the upper slot of the sliding groove 41. The descaling component 9 slides from the upper slot of the sliding groove 41 into the lower slot. Then, fix the limiting block 42 with bolts. Next, put the upper bushing 51 on the three sets of descaling components 9 from below and fix the upper bushing 51 to the second transmission component 312. Then, put the lower bushing 52 on from below and lift the descaling component 9 until the lower bushing 52 is close to the upper bushing 51. Align each set of threaded blocks 91 with the inner thread groove 522 and be able to move along the trajectory inside it. Finally, fix the upper bushing 51 and the lower bushing 52 with bolts. After installing the descaling component 9, install the scraping component 7. When installing the scraping component 7, first rotate the sliding outer ring 73 to the top of the inner thread groove 522. Then, put the scraping block 71 on the blade 6 and install the blade 6 on the stirring shaft 4. Then, align the two ends of the transmission bar 72 and fix it with pins to complete the installation.

[0051] Working principle: According to the working environment, its specific working conditions can be divided into neutralization reaction stage and cleaning stage;

[0052] During the neutralization reaction stage, pre-treated furfural wastewater is poured into the neutralization tank 1. Electromagnet 324 is activated, causing permanent magnet 323 to move downwards and maintain its position. Stirring motor 2 is activated, driving shaft coupling 321 and outer shaft 5 to rotate. Shaft coupling 321 drives stirring shaft 4 to rotate. Stirring shaft 4 and outer shaft 5 rotate in the same direction and at the same speed. Scraping component 7 and descaling component 9 do not move relative to stirring shaft 4 and outer shaft 5. Blade 6 stirs the furfural wastewater inside the neutralization tank 1. After stirring, the neutralized furfural wastewater in the neutralization tank 1 is transported to the next process. Impurities and some calcium salts generated during the neutralization reaction remain at the bottom of the neutralization tank 1 and are partially adsorbed on the blades.

[0053] During the cleaning phase, stopping the electromagnet 324 releases the spring 325, pushing the permanent magnet 323 upwards, preventing the shaft coupling 321 from being driven by the stirring motor 2. Starting the stirring motor 2 causes the outer sleeve shaft 5 to rotate. The sliding outer ring 73, influenced by the outer ring thread groove 74 and the outer thread groove 521, moves downwards. The sliding outer ring 73 drives the transmission bar 72 to move away from the stirring shaft 4. The scraper block 71 also moves away from the stirring shaft 4 along the length of the blade 6, scraping the surface of the blade 6. Calcium salts are in a milky state when first attached, making them easier to scrape off. Meanwhile, the threaded block 91 and the inner thread groove 522 on the inner side of the outer sleeve shaft 5... The sliding block 92 and the sliding groove 41 work together to make the entire scale removal component 9 move downwards. When the scale removal component 9 moves to the bottom, the scraper block 71 also moves to the farthest end of the blade 6. At this time, the electromagnet 324 is activated to make the permanent magnet 323 move downwards and maintain its state. The stirring motor 2 is activated to drive the stirring shaft 4 and the outer shaft 5 to rotate at a low speed. The steel brush 94 scrapes the bottom of the neutralization tank 1. After scraping for a period of time, clean water is poured into the neutralization tank 1 to rinse it, so that the bottom of the neutralization tank 1 and the steel brush 94 are clean. This is repeated several times until the cleaning is completed. Then the electromagnet 324 is stopped, the stirring motor 2 is activated to rotate in the opposite direction, and the scale removal component 9 and the scraper block 71 are retracted. The cleaning is completed after they are in place.

[0054] Example 2 differs from Example 1 in that a brake device is provided on the lower half of the shaft coupling 321. When the electromagnet 324 stops, the permanent magnet 323 moves upward and triggers the brake device, preventing the lower half of the shaft coupling 321 from rotating.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wastewater treatment device for furfural processing, characterized in that, include: Neutralization tank (1), wherein the neutralization tank (1) is used to hold furfural wastewater for neutralization; A stirring motor (2) is located on top of the neutralization tank (1); A stirring shaft (4) is installed inside the neutralization tank (1) and extends out of the top of the neutralization tank (1); The outer sleeve shaft (5) is installed inside the neutralization tank (1) and extends through the top of the neutralization tank (1). The outer sleeve shaft (5) is sleeved on the outside of the stirring shaft (4), and there is a gap between the outer sleeve shaft (5) and the stirring shaft (4). Multiple sets of blades (6), the blades (6) being located below the stirring shaft (4); Its features are: The coupling assembly (3) is installed at the output end of the stirring motor (2). The coupling assembly (3) is used to drive the stirring shaft (4) to rotate alone or to drive the stirring shaft (4) and the outer sleeve shaft (5) to rotate together. as well as Multiple scraping components (7) are installed between the outer sleeve shaft (5) and the blade (6) and are used to clean the scale on the blade (6).

2. The wastewater treatment device for furfural processing according to claim 1, characterized in that, The coupling assembly (3) includes an outer shaft linkage part (31) and an inner shaft linkage part (32). The outer shaft linkage part (31) has a first transmission member (311), a second transmission member (312), and an intermediate connector (313). The first transmission member (311) is connected to the output end of the stirring motor (2), the second transmission member (312) is connected to the outer sleeve shaft (5), and the intermediate connector (313) is used to transmit power between the first transmission member (311) and the second transmission member (312) and keep the rotation direction and rotation speed of the first transmission member (311) and the second transmission member (312) consistent.

3. The wastewater treatment device for furfural processing according to claim 2, characterized in that, The inner shaft linkage (32) includes a shaft head coupling (321), which has upper and lower halves. The upper half of the shaft head coupling (321) slides on the output end of the stirring motor (2). A set of bearings (322) is respectively installed on the outer side of the upper and lower halves of the shaft head coupling (321). A permanent magnet (323) is provided on the outer side of the bearing (322) installed on the upper half, and an electromagnet (324) is provided on the outer side of the bearing (322) installed on the lower half. Multiple sets of springs (325) are provided between the permanent magnet (323) and the electromagnet (324).

4. The wastewater treatment device for furfural processing according to claim 1, characterized in that, The gap between the stirring shaft (4) and the outer shaft (5) is filled with multiple sets of self-lubricating bearings. The outer shaft (5) has an upper bushing (51) and a lower bushing (52). The bottom outer wall of the lower bushing (52) is surrounded by an external thread groove (521). The external thread groove (521) has a number of thread turns and a total thread length.

5. The wastewater treatment device for furfural processing according to claim 4, characterized in that, The scraping assembly (7) includes a scraper block (71), which is sleeved on the outside of the blade (6). A sliding outer ring (73) is sleeved on the outside of the lower bushing (52). An outer ring thread groove (74) is opened on the inner wall of the sliding outer ring (73). The outer ring thread groove (74) and the outer thread groove (521) fit together. A transmission bar (72) is provided between the sliding outer ring (73) and the scraper block (71). The transmission bar (72) is hinged to the scraper block (71) and the sliding outer ring (73) by a pin.

6. The wastewater treatment device for furfural processing according to claim 5, characterized in that, The blade (6) is an inclined strip structure, the transmission strip (72) is arranged perpendicularly to the blade (6) in the same direction, and the transmission strip (72) is vertically hinged to the scraper block (71).

7. The wastewater treatment device for furfural processing according to claim 6, characterized in that, The upper bushing (51) and the lower bushing (52) are connected by a flange and bolts. The inner diameter of the upper bushing (51) is larger than the inner diameter of the lower bushing (52). The inner wall of the lower bushing (52) is provided with an internal thread groove (522). The internal thread groove (522) also has a number of thread turns and a total thread length. The number of thread turns of the internal thread groove (522) is the same as the number of thread turns of the external thread groove (521). The total thread length of the internal thread groove (522) is greater than the total thread length of the external thread groove (521).

8. The wastewater treatment device for furfural processing according to claim 7, characterized in that, The outer wall of the stirring shaft (4) is provided with multiple sets of sliding grooves (41). The sliding groove (41) has upper and lower openings. The two ends of the lower opening of the sliding groove (41) have flanges near the outer wall. The two ends of the upper opening of the sliding groove (41) are spaced at the same distance from the outer wall. The upper opening of the sliding groove (41) is not lower than the top of the lower shaft sleeve (52). The outer side of the top flange of the lower opening of the sliding groove (41) is equipped with a limiting block (42) by bolts.

9. A wastewater treatment device for furfural processing according to claim 8, characterized in that, Multiple sets of descaling components (9) are installed on the outside of the stirring shaft (4). The descaling components (9) include a threaded block (91). The thread on the outside of the threaded block (91) is engaged with the thread of the inner thread groove (522). A sliding block (92) is provided on the inside of the threaded block (91). The sliding block (92) slides against the sliding groove (41). A steel rope (93) is provided at the bottom of the threaded block (91). A steel brush (94) is provided at one end of the steel rope (93) away from the threaded block (91). The length of the steel rope (93) is not less than the distance from the blade (6) to the bottom of the inner wall of the neutralization tank (1).

10. A wastewater treatment device for furfural processing according to claim 9, characterized in that, The cleaning components (9) are all positioned away from the blades (6), the upper and lower ends of the sliding block (92) are both arc-shaped, the steel brush (94) has a counterweight inside, and the stirring shaft (4) is made of solid anti-corrosion material.

Images