A reaction kettle for preparing quartz sand by hydrolysis of TEOS

Abstract

The application is a kind of reaction kettle for preparing quartz sand by hydrolysis of TEOS, and relates to the field of quartz sand preparation, which comprises a reaction kettle body, a stirring device, a heating device, a feeding port and a discharging port. The reaction kettle body is a double-layer structure, including an outer cylinder and an inner cylinder. The heating device is arranged between the outer cylinder and the inner cylinder. The feeding port is arranged on the upper part of the reaction kettle body, and the discharging port is arranged on the lower part of the reaction kettle body. The stirring device comprises a driving motor and a stirring shaft. The driving motor is installed on the upper part of the reaction kettle body, and drives the stirring shaft to rotate. The stirring shaft is located inside the inner cylinder. The heating device comprises a heating ring frame and an electric heating pipe. The heating ring frame is rotatably installed on the outer side of the inner cylinder. The heating ring frame is connected with the stirring shaft through a transmission mechanism. The electric heating pipe is installed on the heating ring frame. When the driving motor drives the stirring shaft to rotate, the heating ring frame is driven to rotate through the transmission mechanism, so that the phenomenon of uneven heating of the inner cylinder caused by fixed-point heating of the electric heating pipe is avoided.

Description

Technical Field

[0001] This invention relates to the field of quartz sand preparation, and more specifically to a reaction vessel for preparing quartz sand by TEOS hydrolysis. Background Technology

[0002] Quartz sand is an important inorganic non-metallic material, widely used in optics, electronics, building materials and other fields. Traditional methods for preparing quartz sand mainly rely on high-purity quartz ore. With the increasing depletion of quartz ore resources, it is urgent to find new preparation methods. Currently used preparation methods have drawbacks such as low product purity and high energy consumption, which make it difficult to meet the strict requirements of high-end application fields for the purity of quartz sand.

[0003] The hydrolysis of tetraethyl orthosilicate (TEOS) to prepare quartz sand is an emerging synthetic method. The principle involves reacting TEOS with water to generate SiO2 and ethanol, followed by aging, drying, grinding, and calcination to produce high-purity quartz sand. This method is not dependent on quartz mineral resources, the raw materials are readily available, the process is clean and environmentally friendly, and the product has high purity, meeting the high-purity requirements of raw materials such as semiconductors, photovoltaics, and quartz components. Existing TEOS hydrolysis quartz sand preparation reactors use electric heating tubes to heat the reaction vessel. However, the electric heating tubes cannot be uniformly distributed outside the reaction vessel, easily causing uneven heating during the process and affecting the product's reaction quality. Summary of the Invention

[0004] The present invention aims to overcome the problem that existing TEOS hydrolysis reactors for preparing quartz sand use electric auxiliary heating to heat the inner liner, but the heating wires cannot be guaranteed to be completely uniformly distributed outside the inner liner, which easily causes uneven heating of the inner liner during the heating process. The purpose is to provide a TEOS hydrolysis reactor for preparing quartz sand.

[0005] The technical problem to be solved by this invention is achieved by the following technical solution:

[0006] A reactor for preparing quartz sand by TEOS hydrolysis includes: a reactor body, a stirring device, a heating device, a feed inlet, and a discharge outlet;

[0007] The reactor body has a double-layer structure, consisting of an outer cylinder and an inner cylinder. The heating device is located between the outer cylinder and the inner cylinder. The reactor body has a feed inlet at the top and a discharge outlet at the bottom.

[0008] The stirring device includes a drive motor and a stirring shaft; the drive motor is installed on the upper part of the reaction vessel body, and the drive motor drives the stirring shaft to rotate, the stirring shaft being located inside the inner cylinder;

[0009] The heating device includes a heating ring frame and an electric heating tube. The heating ring frame is rotatably mounted on the outside of the inner cylinder. The heating ring frame is connected to the stirring shaft through a transmission mechanism. The electric heating tube is mounted on the heating ring frame.

[0010] The transmission mechanism includes a bevel gear set, a transmission shaft, and a transmission gear ring. The stirring shaft and the transmission shaft are driven by the bevel gear set. The transmission shaft is connected to the transmission gear ring by a gear. The transmission gear ring is mounted on the heating ring frame.

[0011] Furthermore, the transmission mechanism also includes a transmission frame and a drive shaft. The transmission frame is fixedly installed on the upper part of the inner cylinder. The drive shaft is coaxially and rotatably installed on the transmission frame. The bevel gear set includes a first bevel gear, a second bevel gear, and a third bevel gear. The first bevel gear is installed on the drive shaft, and the second bevel gear is installed on the transmission shaft. The stirring shaft is rotatably installed on the transmission frame, and the third bevel gear is installed on the stirring shaft. The third bevel gear is located between the first bevel gear and the second bevel gear and meshes with the first bevel gear and the second bevel gear. The drive shaft is connected to the output shaft of the drive motor through gear meshing.

[0012] Furthermore, a support cylinder is installed in the reaction vessel body. The support cylinder is hollow inside. A vent hole is provided at the lower end of the support cylinder. An exhaust pipe is connected to the upper end of the support cylinder through a pipe. An exhaust valve is provided on the exhaust pipe. A sealing plug is provided between the outer side of the support cylinder and the inner wall of the inner cylinder. The sealing plug divides the inner cylinder body into two cavities: an upper cavity for retention and a lower cavity for reaction. The vent hole is located in the reaction cavity. An air exchange pipe is provided at the upper part of the retention cavity.

[0013] Furthermore, a secondary stirring shaft is rotatably mounted on the stirring shaft. The secondary stirring shaft is coaxial with the stirring shaft. The upper end of the secondary stirring shaft is rotatably mounted on a transmission frame. A fourth bevel gear is mounted on the secondary stirring shaft. The fourth bevel gear meshes with a first bevel gear and a second bevel gear. The lower end of the secondary stirring shaft passes through the stirring shaft. Stirring blades are respectively provided in the lower part of the stirring shaft and the lower part of the secondary stirring shaft.

[0014] Furthermore, a first connecting frame is slidably provided on the stirring shaft, and the first connecting frame is rotatably connected to the sealing plug. A second connecting frame is provided on the stirring sub-shaft, and the second connecting frame is rotatably connected to the first connecting frame. A first receiving plate is provided on the first connecting frame, and the first receiving plate is located at the lower part of the stirring shaft. A second receiving plate is provided on the second connecting frame, and the second receiving plate is located at the lower part of the stirring sub-shaft.

[0015] Furthermore, a positioning shaft is installed at the bottom of the inner cylinder, and the positioning shaft is rotatably inserted into the stirring auxiliary shaft.

[0016] Furthermore, a reciprocating screw is installed on the stirring blade, and a scraper is provided on the moving part of the reciprocating screw. The scraper contacts the outer side of the stirring blade. A one-way ratchet is installed at one end of the reciprocating screw, and a linkage gear ring is provided on the outer ring of the one-way ratchet. Support slides are respectively installed inside the stirring sub-shaft and the stirring shaft. A linkage rack is slidably installed on the support slide, and the linkage rack meshes with the linkage gear ring. Linkage mechanisms are respectively provided on the stirring sub-shaft and the positioning shaft. The linkage mechanism on the stirring sub-shaft drives the linkage rack on the stirring shaft to reciprocate, and the linkage mechanism on the positioning shaft drives the linkage rack on the stirring sub-shaft to reciprocate.

[0017] Furthermore, the linkage mechanism includes a central shaft, a first connecting plate, a second connecting plate, a deflection shaft, a deflection ring, and a top pressure rod. The first connecting plate and the second connecting plate are fixedly installed on the central shaft. The deflection shaft is rotatably installed on the central shaft. The two ends of the deflection shaft are connected to the deflection ring. The outer ring of the deflection ring is provided with a guide ring groove. The linkage rack is provided with a connecting block. The connecting block is located in the guide ring groove. The top pressure rod is slidably installed on the second connecting plate. The upper end of the top pressure rod is hinged to the side of the deflection ring. The lower end of the top pressure rod is installed with a universal wheel. A compression spring is provided between the universal wheel and the second connecting plate. The universal wheel in the linkage mechanism on the stirring sub-shaft contacts the first receiving plate, and the universal wheel in the linkage mechanism on the positioning shaft contacts the second receiving plate.

[0018] Furthermore, the stirring shaft, the secondary stirring shaft, the positioning shaft, the first connecting plate, and the second connecting plate are all coaxially arranged.

[0019] The beneficial effects of this invention are:

[0020] The stirring device uses a drive motor to rotate the stirring shaft, which mixes the reactants in the reactor while simultaneously driving the heating ring frame to rotate via a transmission mechanism. The heating ring frame then drives the electric heating tube to rotate around the inner cylinder, thus avoiding the phenomenon of uneven heating of the inner cylinder caused by the fixed-point heating of the electric heating tube.

[0021] The drive motor drives the drive shaft to rotate, and the drive shaft drives the third bevel gear and the fourth bevel gear to rotate in opposite directions through the first bevel gear. This causes the stirring shaft connected to the third bevel gear and the stirring sub-shaft connected to the fourth bevel gear to rotate in opposite directions on the same axis. Due to the reverse rotation of the stirring sub-shaft and the stirring shaft, the stirring blades move inside the inner cylinder, which is beneficial to promoting the mixing of the upper and lower layers of reactants in the inner cylinder.

[0022] The up-and-down movement of the sealing plug drives the deflection ring in the linkage mechanism between the stirring shaft and the positioning shaft to deflect. The rotation speed of the reciprocating screw is adjusted according to the distance the sealing plug moves. As the ethanol gas evaporates, the movement speed of the scraper on the stirring blade is changed. Attached Figure Description

[0023] Figure 1 This is a cross-sectional schematic diagram of the reaction vessel body of the present invention;

[0024] Figure 2 This is a schematic diagram of the transmission mechanism structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the sealing plug installation according to the present invention;

[0026] Figure 4 This is a schematic diagram of the installation of the first connecting frame and the second connecting frame of the present invention;

[0027] Figure 5 This is a schematic diagram of the linkage mechanism structure of the present invention;

[0028] Figure 6 The linkage mechanism of this invention is located at the stirring shaft and the stirring sub-shaft, as shown in the structural schematic diagram;

[0029] Figure 7 A schematic diagram showing the connection between the connecting block and the deflection ring, where the linkage mechanism of the present invention is located at the stirring shaft and the secondary stirring shaft;

[0030] Figure 8 The linkage mechanism of this invention is located at the stirring shaft and the positioning shaft, as shown in the structural diagram;

[0031] Figure 9 A schematic diagram showing the connection between the connecting block and the deflection ring, where the linkage mechanism of the present invention is located at the stirring sub-shaft and the positioning shaft;

[0032] In the diagram: 1. Reactor body; 2. Stirring device; 3. Heating device; 4. Feed inlet; 5. Discharge outlet; 12. Outer cylinder; 13. Inner cylinder; 14. Drive motor; 15. Stirring shaft; 16. Heating ring frame; 17. Electric heating tube; 18. Transmission mechanism; 21. Transmission frame; 22. Drive shaft; 23. Transmission shaft; 24. Transmission gear ring; 25. First bevel gear; 26. Second bevel gear; 27. Third bevel gear; 28. Stirring sub-shaft; 29. ​​Fourth bevel gear; 30. Stirring blade; 41. Support cylinder; 42. Air vent; 43. Exhaust pipe; 44. 45. Exhaust valve; 46. Sealing plug; 47. Ventilation pipe; 48. First connecting frame; 49. Second connecting frame; 50. First receiving plate; 51. Second receiving plate; 62. Positioning shaft; 63. Reciprocating screw; 64. Scraper; 65. One-way ratchet; 66. Linkage gear ring; 67. Support slide; 68. Linkage rack; 69. Linkage mechanism; 60. Central shaft; 71. First connecting plate; 72. Second connecting plate; 73. Deflection shaft; 74. Deflection ring; 75. Top pressure rod; 76. Guide ring groove; 77. Connecting block; 78. Universal wheel; 79. Compression spring. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0034] Example 1

[0035] like Figure 1 As shown, a reactor for preparing quartz sand by TEOS hydrolysis includes: reactor body 1, stirring device 2, heating device 3, feed inlet 4, and discharge outlet 5;

[0036] The reactor body 1 has a double-layer structure, consisting of an outer cylinder 12 and an inner cylinder 13. The heating device 3 is located between the outer cylinder 12 and the inner cylinder 13. The reactor body 1 has a feed inlet 4 at the top and a discharge outlet 5 at the bottom.

[0037] The stirring device 2 includes a drive motor 14 and a stirring shaft 15; the drive motor 14 is installed on the upper part of the reactor body 1, and the drive motor 14 drives the stirring shaft 15 to rotate, and the stirring shaft 15 is located inside the inner cylinder 13.

[0038] Heating device 3 includes heating ring frame 16 and electric heating tube 17. Heating ring frame 16 is rotatably mounted on the outside of inner cylinder 13. Heating ring frame 16 is connected to stirring shaft 15 through transmission mechanism 18. Electric heating tube 17 is mounted on heating ring frame 16.

[0039] The transmission mechanism 18 includes a bevel gear set, a transmission shaft 23, and a transmission gear ring 24. The stirring shaft 15 and the transmission shaft 23 are driven by the bevel gear set. The transmission shaft 23 is connected to the transmission gear ring 24 by gears. The transmission gear ring 24 is mounted on the heating ring frame 16.

[0040] The stirring device 2 uses a drive motor 14 to drive the stirring shaft 15 to rotate. The stirring shaft 15 drives the transmission shaft 23 to rotate through a bevel gear set. The rotation of the transmission shaft 23 drives the transmission gear ring 24 to rotate, thereby driving the heating ring frame 16 to rotate around the inner cylinder 13. While completing the stirring and mixing of the reactants in the reactor body 1, the heating ring frame 16 is driven to rotate through the transmission mechanism 18. The heating ring frame 16 drives the electric heating tube 17 to rotate around the inner cylinder 13, avoiding the phenomenon of uneven heating of the inner cylinder 13 caused by the fixed-point heating of the electric heating tube 17.

[0041] Example 2

[0042] Based on Example 1, such as Figure 1-3As shown, the transmission mechanism 18 also includes a transmission frame 21 and a drive shaft 22. The transmission frame 21 is fixedly installed on the upper part of the inner cylinder 13. The drive shaft 22 and the transmission shaft 23 are coaxially and rotatably installed on the transmission frame 21. The bevel gear set includes a first bevel gear 25, a second bevel gear 26, and a third bevel gear 27. The first bevel gear 25 is installed on the drive shaft 22, and the second bevel gear 26 is installed on the transmission shaft 23. The stirring shaft 15 is rotatably installed on the transmission frame 21, and the third bevel gear 27 is installed on the stirring shaft 15. The third bevel gear 27 is between the first bevel gear 25 and the second bevel gear 26 and meshes with the first bevel gear 25 and the second bevel gear 26. The drive shaft 22 is connected to the output shaft of the drive motor 14 through gear meshing.

[0043] A secondary stirring shaft 28 is rotatably mounted on the stirring shaft 15. The secondary stirring shaft 28 is coaxial with the stirring shaft 15. The upper end of the secondary stirring shaft 28 is rotatably mounted on the transmission frame 21. A fourth bevel gear 29 is mounted on the secondary stirring shaft 28. The fourth bevel gear 29 meshes with the first bevel gear 25 and the second bevel gear 26. The lower end of the secondary stirring shaft 28 passes through the stirring shaft 15. Stirring blades 30 are respectively provided in the lower part of the stirring shaft 15 and the lower part of the secondary stirring shaft 28.

[0044] The drive motor drives the drive shaft 22 to rotate. The drive shaft 22 drives the third bevel gear 27 and the fourth bevel gear 29 to rotate in opposite directions through the first bevel gear 25. This causes the stirring shaft 15 connected to the third bevel gear 27 and the stirring sub-shaft 28 connected to the fourth bevel gear 29 to rotate in opposite directions on the same axis. Due to the reverse rotation of the stirring sub-shaft 28 and the stirring shaft 15, the stirring blade 30 moves inside the inner cylinder 13, which helps to promote the mixing of the upper and lower layers of reactants in the inner cylinder 13 and improves the reaction effect. The symmetrical layout structure formed by the first bevel gear 25, the second bevel gear 26, the third bevel gear 27 and the fourth bevel gear 29 ensures that the load borne by each gear is evenly distributed, avoiding instability caused by the load being concentrated on one or a few gears.

[0045] Example 3

[0046] Based on Example 1, such as Figure 1-3 As shown, a support cylinder 41 is installed in the reactor body 1. The support cylinder 41 is hollow inside. A vent hole 42 is provided at the lower end of the support cylinder 41. An exhaust pipe 43 is connected to the upper end of the support cylinder 41 through a pipe. An exhaust valve 44 is provided on the exhaust pipe 43. A sealing plug 45 is provided between the outer side of the support cylinder 41 and the inner wall of the inner cylinder 13. The sealing plug 45 divides the inner cylinder 13 into two cavities. The upper part is a retention cavity and the lower part is a reaction cavity. The vent hole 42 is located in the reaction cavity. A gas exchange pipe 46 is provided at the upper part of the retention cavity.

[0047] A valve is installed on the ventilation pipe 46. When feeding the reactor body 1, the valve on the ventilation pipe 46 and the exhaust valve 44 on the exhaust pipe 43 are opened. At this time, the gas pressure in the retention chamber and the reaction chamber in the inner cylinder 13 is connected to the outside. The sealing plug 45 in the inner cylinder 13 moves downward to the lower part of the support cylinder 41 under the action of gravity. The raw materials to be reacted are added to the reactor body 1 through the feed port 4. The raw materials are introduced into the reaction chamber through the conduit at the feed port 4. After the feeding is completed, the exhaust valve 44 on the exhaust pipe 43 is closed, and the drive motor 14 is turned on to drive the stirring shaft 15 and the heating ring frame 16 to rotate. The heating ring frame 16 is used to rotate the stirring shaft 15 and the heating ring frame 16. The electric heating tube 17 on the 6 heats the inner cylinder 13. The reaction raw materials react in the reaction chamber. In the first stage of the reaction, TEOS undergoes reversible hydrolysis under the heating environment and the action of the catalyst to produce silanol (Si-OH) and ethanol. In the heating environment, ethanol volatilizes to form a gas mixture of ethanol and vapor. As the gas is produced, the pressure in the reaction chamber increases. Under the action of pressure, the sealing plug 45 will move upward to maintain the gas pressure in the reaction chamber. The ethanol gas produced by the reaction is retained in the reaction chamber. In the reversible reaction of TEOS hydrolysis, it is easy to control the rate of TEOS hydrolysis.

[0048] Example 4

[0049] Based on Example 3, as the ethanol gas evaporates, a significant amount of silanol (Si-OH) is generated in the reaction solution. This initiates the second stage of the reaction. The unstable silanol (Si-OH) undergoes condensation polymerization, ultimately forming silicon dioxide and water. During this stage, silicon dioxide particles are generated in the solution. These particles precipitate and adhere to the stirring blade 30, increasing its load. Prolonged accumulation can easily cause the stirring blade 30 to break. Therefore, to address this problem, as... Figure 4-9 As shown, a first connecting frame 47 is slidably provided on the stirring shaft 15, and the first connecting frame 47 is rotatably connected to the sealing plug 45. A second connecting frame 48 is provided on the stirring sub-shaft 28, and the second connecting frame 48 is rotatably connected to the first connecting frame 47. A first receiving plate 49 is provided on the first connecting frame 47, and the first receiving plate 49 is located at the lower part of the stirring shaft 15. A second receiving plate 50 is provided on the second connecting frame 48, and the second receiving plate 50 is located at the lower part of the stirring sub-shaft 28.

[0050] A positioning shaft 51 is installed at the bottom of the inner cylinder 13, and the positioning shaft 51 is rotated and inserted into the stirring auxiliary shaft 28;

[0051] A reciprocating screw 61 is installed on the stirring blade 30. A scraper 62 is provided on the moving part of the reciprocating screw 61. The scraper 62 contacts the outer side of the stirring blade 30. A one-way ratchet 63 is installed at one end of the reciprocating screw 61. A linkage gear ring 64 is provided on the outer ring of the one-way ratchet 63. A support slide 65 is installed inside the stirring sub-shaft 28 and the stirring shaft 15 respectively. A linkage rack 66 is slidably installed on the support slide 65. The linkage rack 66 meshes with the linkage gear ring 64. A linkage mechanism 67 is provided on the stirring sub-shaft 28 and the positioning shaft 51 respectively. The linkage mechanism 67 on the stirring sub-shaft 28 drives the linkage rack 66 on the stirring shaft 15 to reciprocate. The linkage mechanism 67 on the positioning shaft 51 drives the linkage rack 66 on the stirring sub-shaft 28 to reciprocate.

[0052] The linkage mechanism 67 drives the linkage rack 66 to rotate, the linkage rack 66 drives the linkage gear ring 64 to rotate, and the one-way ratchet 63 drives the reciprocating screw 61 to rotate in one direction. When the reciprocating screw 61 rotates, its moving part drives the scraper 62 to move along the surface of the stirring blade 30. When the scraper 62 moves, it can clean the silica powder particles adsorbed on the surface of the stirring blade 30.

[0053] The linkage mechanism 67 includes a central shaft 68, a first connecting plate 69, a second connecting plate 70, a deflection shaft 71, a deflection ring 72, and a top pressure rod 73. The first connecting plate 69 and the second connecting plate 70 are fixedly installed on the central shaft 68. The deflection shaft 71 is rotatably installed on the central shaft 68. The two ends of the deflection shaft 71 are connected to the deflection ring 72. The outer ring of the deflection ring 72 is provided with a guide ring groove 74. The linkage rack 66 is provided with a connecting block 75, which is located in the guide ring groove 74. The top pressure rod 73 is slidably installed on the second connecting plate 70. The upper end of the top pressure rod 73 is hinged to the side of the deflection ring 72. The lower end of the top pressure rod 73 is provided with a universal wheel 76. A compression spring 77 is provided between the universal wheel 76 and the second connecting plate 70. The universal wheel 76 in the linkage mechanism 67 on the stirring sub-shaft 28 contacts the first receiving plate 49. The universal wheel 76 in the linkage mechanism 67 on the positioning shaft 51 contacts the second receiving plate 50.

[0054] The plane formed by the radius line of the deflection ring 72 passing through the hinge point of the top pressure rod 73 and the axis of the top pressure rod 73 is perpendicular to the deflection axis 71;

[0055] The stirring shaft 15, the secondary stirring shaft 28, the positioning shaft 51, the first connecting plate 69, and the second connecting plate 70 are all coaxially arranged;

[0056] Before the reaction material is added to the reaction chamber, the sealing plug 45 moves downward to the lower part of the support cylinder 41 under the action of gravity. The sealing plug 45 drives the first connecting frame 47 and the second connecting frame 48 to move downward, which in turn drives the first receiving plate 49 and the second receiving plate 50 to move downward. When the first receiving plate 49 and the second receiving plate 50 move to the bottom of their respective strokes, the universal wheel 76 that they come into contact with will also move downward under the action of the compression spring 77. The universal wheel 76 drives the top pressure rod 73 to move downward, and the top pressure rod 73 pulls the deflection ring 72 to deflect to a horizontal state.

[0057] As the amount of ethanol gas volatilized in the reaction chamber increases, the sealing plug 45 moves upward. When the sealing plug 45 moves upward, it drives the first connecting frame 47 and the second connecting frame 48 to move upward. The first connecting frame 47 drives the first receiving plate 49 to move upward, and the second connecting frame 48 drives the second receiving plate 50 to move upward. As the first receiving plate 49 and the second receiving plate 50 move upward, the first receiving plate 49 lifts the universal wheel 76 in the linkage mechanism 67 on the stirring sub-shaft 28, while the second receiving plate 50 lifts the universal wheel 76 in the linkage mechanism 67 on the positioning shaft 51, thereby driving the linkage mechanism 67 on the stirring sub-shaft 28 and the positioning shaft 51 to move.

[0058] When the caster wheel 76 is subjected to an upward thrust, it will push the top pressure rod 73 to move upward. As the top pressure rod 73 moves upward, it will drive the deflection ring 72 to rotate around the deflection shaft 71.

[0059] When the linkage mechanism 67 is set on the stirring sub-shaft 28, such as Figure 6-7 As shown, the stirring sub-shaft 28 serves as the central shaft 68. The first connecting plate 69, the second connecting plate 70, and the deflection shaft 71 are all mounted on the stirring sub-shaft 28. Since the stirring sub-shaft 28 and the stirring shaft 15 rotate in opposite directions, there is a relative rotation between the stirring sub-shaft 28 and the stirring shaft 15. The stirring shaft 15 drives the linkage rack 66 to move, while the connecting block 75 on the linkage rack 66 is restricted by the guide ring groove 74 on the outer ring of the deflection ring 72 and moves along the guide ring groove 74. When the deflection ring 72 deflects, the guide ring groove 74 pushes the connecting block 75 to move up and down within the deflection range of the deflection ring 72, thereby driving the linkage rack 66 to move up and down reciprocally. When the deflection ring 72 does not deflect, the connecting block 75 is restricted by the guide ring groove 74 to move only on the same horizontal plane. At this time, the linkage rack 66 will remain stationary in the axial direction and will not move up and down.

[0060] When the linkage mechanism 67 is set on the positioning shaft 51, such as Figure 8-9As shown, the positioning shaft 51 serves as the central shaft 68. At this time, the first connecting plate 69, the second connecting plate 70, and the deflection shaft 71 are all set on the stirring sub-shaft 28. The positioning shaft 51 is fixed to the bottom of the inner cylinder 13, while the stirring sub-shaft 28 can rotate. Thus, there is also relative rotation between the stirring sub-shaft 28 and the positioning shaft 51. When the stirring sub-shaft 28 rotates, it drives the linkage rack 66 on it to move. The connecting block 75 on the linkage rack 66 is restricted by the guide ring groove 74 on the outer ring of the deflection ring 72 on the positioning shaft 51. When the deflection ring 72 deflects, it also drives the linkage rack 66 to move up and down. When the deflection ring 72 is horizontal, the linkage rack 66 on the stirring sub-shaft 28 will also be in a stationary state.

[0061] Therefore, the up-and-down movement of the sealing plug 45 drives the deflection ring 72 in the linkage mechanism 67 between the stirring shaft 28 and the positioning shaft 51 to deflect. The deflection angle of the deflection ring 72 is dynamically changed according to the distance the sealing plug 45 moves, thereby changing the stroke of the linkage rack 66. When the rotation frequency of the stirring shaft 15 and the stirring shaft 28 remains unchanged, the change in the stroke of the linkage rack 66 can bring about a change in the speed of the reciprocating screw 61. As the stroke of the linkage rack 66 increases, the speed of the reciprocating screw 61 will also increase.

[0062] In the first stage of the reaction, the amount of ethanol gas produced is relatively small, resulting in a small upward floating distance of the sealing plug 45. Simultaneously, the amount of silica powder precipitated is also small. Therefore, controlling the slow movement of the scraper 62 on the stirring blade 30 reduces wear on the blade. However, as the reaction progresses to the second stage, a large amount of ethanol gas evaporates, increasing the amount of silica powder precipitated. The increased gas pressure causes the sealing plug 45 to float a greater distance upward. This upward movement of the sealing plug 45 causes the reciprocating screw 61 on the stirring blade 30 to rotate faster, thereby increasing the scraping rate of the scraper 62 on the surface of the stirring blade 30.

[0063] The moving speed of the scraper 62 on the stirring blade 30 is adaptively correlated with the reaction stage. In the stage where less silica powder is precipitated, the scraping frequency between the scraper 62 and the stirring blade 30 is reduced, the wear of the scraper 62 is reduced, and the service life of the scraper 62 is improved.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A reaction vessel for preparing silica sand by TEOS hydrolysis, characterized in that, include: Reactor body, stirring device, heating device, feed inlet, and discharge outlet; The reactor body has a double-layer structure, consisting of an outer cylinder and an inner cylinder. The heating device is located between the outer cylinder and the inner cylinder. The reactor body has a feed inlet at the top and a discharge outlet at the bottom. The stirring device includes a drive motor and a stirring shaft; the drive motor is installed on the upper part of the reaction vessel body, and the drive motor drives the stirring shaft to rotate, the stirring shaft being located inside the inner cylinder; The heating device includes a heating ring frame and an electric heating tube. The heating ring frame is rotatably mounted on the outside of the inner cylinder. The heating ring frame is connected to the stirring shaft through a transmission mechanism. The electric heating tube is mounted on the heating ring frame. The transmission mechanism includes a bevel gear set, a transmission shaft, and a transmission gear ring. The stirring shaft and the transmission shaft are driven by the bevel gear set. The transmission shaft is connected to the transmission gear ring by a gear. The transmission gear ring is mounted on the heating ring frame. The transmission mechanism further includes a transmission frame and a drive shaft. The transmission frame is fixedly installed on the upper part of the inner cylinder. The drive shaft is rotatably mounted on the transmission frame coaxially with the transmission shaft. The bevel gear set includes a first bevel gear, a second bevel gear, and a third bevel gear. The first bevel gear is mounted on the drive shaft, and the second bevel gear is mounted on the transmission shaft. The stirring shaft is rotatably mounted on the transmission frame, and the third bevel gear is mounted on the stirring shaft. The third bevel gear is located between the first bevel gear and the second bevel gear and meshes with the first bevel gear and the second bevel gear. The drive shaft is connected to the output shaft of the drive motor through gear meshing. A support cylinder is installed inside the reactor body. The support cylinder is hollow inside. A vent hole is provided at the lower end of the support cylinder. An exhaust pipe is connected to the upper end of the support cylinder through a pipe. An exhaust valve is provided on the exhaust pipe. A sealing plug is provided between the outer side of the support cylinder and the inner wall of the inner cylinder. The sealing plug divides the inner cylinder into two cavities: an upper cavity for retention and a lower cavity for reaction. The vent hole is located in the reaction cavity. A ventilation pipe is provided at the upper part of the cavity for retention. A secondary stirring shaft is rotatably mounted on the stirring shaft. The secondary stirring shaft is coaxial with the stirring shaft. The upper end of the secondary stirring shaft is rotatably mounted on the transmission frame. A fourth bevel gear is mounted on the secondary stirring shaft. The fourth bevel gear meshes with a first bevel gear and a second bevel gear. The lower end of the secondary stirring shaft passes through the stirring shaft. Stirring blades are respectively provided in the lower part of the stirring shaft and the lower part of the secondary stirring shaft. A first connecting frame is slidably provided on the stirring shaft, and the first connecting frame is rotatably connected to the sealing plug. A second connecting frame is provided on the stirring sub-shaft, and the second connecting frame is rotatably connected to the first connecting frame. A first receiving plate is provided on the first connecting frame, and the first receiving plate is located at the lower part of the stirring shaft. A second receiving plate is provided on the second connecting frame, and the second receiving plate is located at the lower part of the stirring sub-shaft. A positioning shaft is installed at the bottom of the inner cylinder, and the positioning shaft is rotatably inserted into the stirring auxiliary shaft. A reciprocating screw is installed on the stirring blade, and a scraper is provided on the moving part of the reciprocating screw. The scraper contacts the outer side of the stirring blade. A one-way ratchet is installed at one end of the reciprocating screw, and a linkage gear ring is provided on the outer ring of the one-way ratchet. Support slides are respectively installed inside the stirring sub-shaft and the stirring shaft. A linkage rack is slidably installed on the support slide, and the linkage rack meshes with the linkage gear ring. Linkage mechanisms are respectively provided on the stirring sub-shaft and the positioning shaft. The linkage mechanism on the stirring sub-shaft drives the linkage rack on the stirring shaft to reciprocate, and the linkage mechanism on the positioning shaft drives the linkage rack on the stirring sub-shaft to reciprocate. The linkage mechanism includes a central shaft, a first connecting plate, a second connecting plate, a deflection shaft, a deflection ring, and a top pressure rod. The first connecting plate and the second connecting plate are fixedly installed on the central shaft. The deflection shaft is rotatably installed on the central shaft. The two ends of the deflection shaft are connected to the deflection ring. The outer ring of the deflection ring is provided with a guide ring groove. The linkage rack is provided with a connecting block, which is located in the guide ring groove. The top pressure rod is slidably installed on the second connecting plate. The upper end of the top pressure rod is hinged to the side of the deflection ring. The lower end of the top pressure rod is equipped with a universal wheel. A compression spring is provided between the universal wheel and the second connecting plate. The universal wheel in the linkage mechanism on the stirring sub-shaft contacts the first receiving plate, and the universal wheel in the linkage mechanism on the positioning shaft contacts the second receiving plate.

2. The reactor for preparing silica sand by TEOS hydrolysis according to claim 1, characterized in that, The stirring shaft, the secondary stirring shaft, the positioning shaft, the first connecting plate, and the second connecting plate are all coaxially arranged.

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