Device for preparing industrial fuel oil by catalytic cracking of waste oil and use method of device

Abstract

The invention belongs to the technical field of waste oil utilization, and particularly relates to a device for preparing industrial fuel oil through catalytic cracking of waste oil and a using method thereof.The device comprises a catalysis bin, a top plate is fixed to the top of the catalysis bin, and at least one feeding pipe is arranged at the position, close to the top end, of the outer side of the catalysis bin; at least one discharging pipe is arranged at the position, close to the bottom end, of the outer side of the catalysis bin, a first stirring shaft paddle is rotationally connected to the position, located in the catalysis bin, of the interior of the top plate, a second stirring shaft paddle is slidably connected into the first stirring shaft paddle, and a driving mechanism is installed at the top of the top plate and used for driving the first stirring shaft paddle to rotate; an adjusting structure is installed in the catalysis bin and used for adjusting the volume of the preparation space in the catalysis bin, and the driving mechanism comprises a fixed gear fixed to the outer side of the first stirring shaft paddle and located on the top of the top plate. According to the invention, the stirring speed can be dynamically adjusted to optimize the mass transfer efficiency, and the effective reaction volume and the heating area can be automatically adjusted according to the waste oil treatment amount.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste oil utilization, and particularly relates to a device for catalytic cracking of waste oil to prepare industrial fuel and a method for using the same. Background Art

[0002] With the development of industry and the improvement of environmental protection awareness, the technology of waste oil resource utilization has gradually become a research hotspot. Through the catalytic cracking process, by mixing waste oil with a catalyst and reacting, waste oil can be converted into industrial fuel to achieve resource recycling. Currently, the existing technology mainly realizes the catalytic cracking of waste oil through a reaction device with a fixed structure. The existing methods for catalytic cracking of waste oil generally adopt a structure of fixed stirring paddles and heating coils, promoting the mixing of waste oil and catalyst through mechanical stirring, and using an external heat source to maintain the reaction temperature.

[0003] However, the traditional device adopts a stirring system with a fixed rotation speed and cannot adjust the mixing intensity in real time according to the catalytic reaction process. For example, in the initial stage of catalyst activity, high shear force is required for dispersion, while at the later stage of the reaction, high rotation speed may lead to energy consumption waste and product decomposition; moreover, the reaction chamber volume of the existing device is fixed. When the processing volume changes (such as small batch experiments or large-scale production), the effective reaction space cannot be dynamically adjusted, and the fixed heating area does not match the liquid volume, resulting in local overheating or insufficient heating, affecting the quality of the cracking products. And when the processing volume decreases, the heating system still needs to operate at full power, causing energy waste. Summary of the Invention

[0004] Aiming at the above problems, the purpose of the present invention is to provide a device for catalytic cracking of waste oil to prepare industrial fuel and a method for using the same, which can dynamically adjust the stirring speed to optimize the mass transfer efficiency and automatically adjust the effective reaction volume and heating area according to the waste oil processing volume.

[0005] The technical solution adopted by the present invention is specifically as follows:

[0006] A device for catalytic cracking of waste oil to prepare industrial fuel and a method for using the same, including a catalytic chamber, the top of the catalytic chamber is fixed with a top plate, at least one feed pipe is arranged on the outer side of the catalytic chamber and near the top end, at least one discharge pipe is arranged on the outer side of the catalytic chamber and near the bottom end, a first stirring shaft paddle is rotatably connected inside the top plate and inside the catalytic chamber, and a second stirring shaft paddle is slidably connected inside the first stirring shaft paddle;

[0007] A driving mechanism is installed on the top of the top plate, the driving mechanism is used to drive the first stirring shaft paddle to rotate, and an adjusting structure is installed inside the catalytic chamber, and the adjusting structure is used to adjust the volume of the preparation space inside the catalytic chamber.

[0008] The driving mechanism includes a fixed gear fixed outside the first stirring shaft paddle and on top of the top plate. A notched gear is rotatably connected to the top of the top plate, and the notched gear is meshed with the fixed gear. A driving motor is installed on the top plate, and the output end of the driving motor is connected to the notched gear;

[0009] A reset structure is installed on the side of the fixed gear away from the notched gear, and the reset structure is used to drive the first stirring shaft paddle to reset.

[0010] The reset structure includes a sliding column slidably connected to the top of the top plate, and the sliding column is meshed with the fixed gear. A fixed block is fixed on the top of the catalytic chamber and on the side of the sliding column away from the fixed gear, and a first spring is fixed on one side of the fixed block. A sliding block protrudes from the side of the sliding column away from the fixed gear, and the sliding block is fixedly connected to the end of the first spring;

[0011] One end of the sliding column is fixed with a fixed strip, and a friction component is installed on the top of the top plate. The friction component is used to control the reset speed of the sliding column.

[0012] Two symmetrically arranged fixing plates are fixed on the top of the top plate. A threaded rod is threadedly connected inside the fixing plate. One end of the threaded rod close to the fixed strip is rotatably connected with a rotating piece. A second spring is fixed on the side of the rotating piece close to the fixed strip. One end of the second spring close to the fixed strip is fixed with a friction piece, and the friction piece is in contact with the fixed strip.

[0013] A limiting strip is fixed on the side of the fixed block close to the first spring and inside the first spring, and the limiting strip is slidably connected with the sliding block.

[0014] The adjusting structure includes a sliding bottom plate slidably connected inside the catalytic chamber, and the sliding bottom plate is rotatably connected with the second stirring shaft paddle. A hydraulic piston cylinder is fixed at the bottom of the catalytic chamber, and the stroke rod of the hydraulic piston cylinder is vertically upward and connected with the sliding bottom plate;

[0015] At least one sliding strip is fixed on the outside of the second stirring shaft paddle, and the sliding strip is slidably connected with the inner wall of the first stirring shaft paddle. A heating structure is installed on the top of the sliding bottom plate, and the heating structure is used to heat according to the height of the sliding bottom plate.

[0016] A conductive strip is fixed on the top of the sliding bottom plate and close to the edge position, and the top end of the conductive strip passes through the top plate and bends downward to the outside of the catalytic chamber and close to the bottom end;

[0017] A conductive block is fixed on the outer side of the catalytic chamber, and the conductive block is slidably connected to the conductive strip. A protective frame is fixed on the outer side of the catalytic chamber and located outside the conductive block and the conductive strip. A plurality of heating strips are uniformly fixed in the inner wall of the catalytic chamber from top to bottom.

[0018] A method for using an industrial fuel oil preparation device by catalytic cracking of waste oil, which is used to describe the operation process and principle of the above device. The method includes the following steps:

[0019] S1: Inject waste oil into the catalytic chamber and add a catalyst into the catalytic chamber to perform catalytic treatment on the waste oil. Drive the drive motor to drive the first stirring shaft paddle and the second stirring shaft paddle to rotate, and stir the catalyst and waste oil.

[0020] S2: When the notched gear drives the fixed gear to rotate, the fixed gear drives the sliding column to move through the meshing connection with the sliding column, compressing the first spring. When the notched gear rotates to not mesh with the fixed gear, the elastic force of the first spring is released, thereby pushing the sliding block to reset, and further causing the first stirring shaft paddle and the second stirring shaft paddle to rotate repeatedly.

[0021] S3: When the sliding column slides back and forth, it can drive the fixed strip to move accordingly. Then, due to the frictional force between the friction plate and the fixed strip, there is a certain resistance to the reset of the fixed strip. By turning the threaded rod, the frictional force between the friction plate and the fixed strip can be adjusted, as well as whether the friction plate and the fixed strip are in contact.

[0022] S4: Drive the hydraulic piston cylinder so that the stroke rod of the hydraulic piston cylinder drives the sliding bottom plate to move upward, thereby reducing the size of the mixing space in the catalytic chamber. When the sliding bottom plate moves upward, it can drive the conductive strip to move upward. When the conductive strip moves upward, through its mutual contact with the conductive block, it is used to control the heating of the corresponding heating strip according to the specific volume of the stirring cavity in the catalytic chamber.

[0023] The technical effects achieved by the present invention are:

[0024] The present invention can dynamically adjust the stirring speed to optimize the mass transfer efficiency by controlling the rotation speed of the drive motor and the sliding speed of the fixed strip. At the same time, by using the hydraulic piston cylinder to lift the sliding bottom plate, it can automatically adjust the effective reaction volume and heating area according to the waste oil treatment amount, thereby significantly improving the energy utilization efficiency and device adaptability while ensuring the fuel quality. Description of the Drawings

[0025] Figure 1 is the overall schematic diagram of the present invention;

[0026] Figure 2 is the structural schematic diagram between the fixed strip, the notched gear and the sliding column of the present invention;

[0027] Figure 3 It is a schematic structural diagram among the fixing bar, the driving motor and the fixed gear in the present invention;

[0028] Figure 4 It is a schematic structural diagram among the fixing plate, the second spring and the friction plate in the present invention;

[0029] Figure 5 It is a sectional view of the catalytic chamber in the present invention;

[0030] Figure 6 It is a schematic structural diagram among the first stirring shaft paddle, the conductive bar and the hydraulic piston cylinder in the present invention.

[0031] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0032] 1. Catalytic chamber; 2. Feed pipe; 3. Discharge pipe; 4. Top plate; 5. First stirring shaft paddle; 6. Second stirring shaft paddle; 7. Driving motor; 8. Notch gear; 9. Fixed gear; 10. Sliding column; 11. Fixed block; 12. First spring; 13. Sliding block; 14. Limiting bar; 15. Fixing bar; 16. Fixing plate; 17. Friction plate; 18. Second spring; 19. Rotating piece; 20. Threaded rod; 21. Sliding bottom plate; 22. Hydraulic piston cylinder; 23. Conductive bar; 24. Conductive block; 25. Protection frame; 26. Sliding bar; 27. Heating bar. Detailed implementation manners

[0033] In order to make the purpose and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention.

[0034] Embodiment 1:

[0035] Refer to the attached Figure 1 - attached Figure 6 , a device for catalytic cracking of waste oil to prepare industrial fuel oil, comprising a catalytic chamber 1, a top plate 4 is fixed on the top of the catalytic chamber 1, at least one feed pipe 2 is arranged on the outer side of the catalytic chamber 1 and near the top end, at least one discharge pipe 3 is arranged on the outer side of the catalytic chamber 1 and near the bottom end, a first stirring shaft paddle 5 is rotatably connected inside the top plate 4 and inside the catalytic chamber 1, and a second stirring shaft paddle 6 is slidably connected inside the first stirring shaft paddle 5;

[0036] One step in catalytically treating waste oil by injecting waste oil into the catalytic chamber 1 and also adding catalysts such as ZSM-5 molecular sieve catalyst and Y-type molecular sieve catalyst into the catalytic chamber 1 to convert the waste oil into industrial fuel of a certain quality. And through the settings of the first stirring shaft paddle 5 and the second stirring shaft paddle 6, after the catalyst and waste oil enter the catalytic chamber 1, the first stirring shaft paddle 5 and the second stirring shaft paddle 6 stir the catalyst and waste oil, making their mixing effect better and the catalytic effect better accordingly;

[0037] A driving mechanism is installed on the top of the top plate 4, and the driving mechanism is used to drive the first stirring shaft paddle 5 to rotate;

[0038] Refer to the appendix Figure 3 , the driving mechanism includes a fixed gear 9 fixed on the outside of the first stirring shaft paddle 5 and located on the top of the top plate 4. A notched gear 8 is rotatably connected to the top of the top plate 4, and the notched gear 8 is meshed with the fixed gear 9. A driving motor 7 is installed on the top plate 4. An L-shaped plate is installed on the top plate 4. Through this L-shaped plate, the installation of the driving motor 7 is ensured, and the output end of the driving motor 7 is connected to the notched gear 8. Further, a protective shell can be arranged outside the driving motor 7 to protect the driving motor 7;

[0039] When driving the first stirring shaft paddle 5 and the second stirring shaft paddle 6 to rotate, the driving motor 7 can be driven, so that the output end of the driving motor 7 drives the notched gear 8 to rotate. Through the meshing connection between the notched gear 8 and the fixed gear 9, the notched gear 8 drives the fixed gear 9 and the first stirring shaft paddle 5 to rotate. Furthermore, the rotation of the first stirring shaft paddle 5 can drive the second stirring shaft paddle 6 to rotate to stir the catalyst and waste oil;

[0040] A reset structure is installed on the side of the fixed gear 9 away from the notched gear 8. The reset structure is used to drive the first stirring shaft paddle 5 to reset. When the notched gear 8 rotates to the part of its notch that is not meshed with the fixed gear 9, the fixed gear 9 is reversely reset through the reset structure. The reset structure is as follows:

[0041] Refer to the appendix Figure 3 , the reset structure includes a sliding column 10 slidably connected to the top of the top plate 4, and the sliding column 10 is meshed with the fixed gear 9. A fixed block 11 is fixed on the top of the catalytic chamber 1 and on the side of the sliding column 10 away from the fixed gear 9. One side of the fixed block 11 is fixed with a first spring 12. A sliding block 13 extends from the side of the sliding column 10 away from the fixed gear 9, and the sliding block 13 is fixed to the end of the first spring 12;

[0042] When the notched gear 8 drives the fixed gear 9 to rotate, the fixed gear 9 drives the sliding column 10 to move through the meshing connection with the sliding column 10. When the sliding column 10 moves, it drives the sliding block 13 to move, thereby compressing the first spring 12. When the notched gear 8 rotates to a position where it no longer meshes with the fixed gear 9, the elastic force of the first spring 12 is released, which then pushes the sliding block 13 back to its original position, driving the sliding column 10 to return to its original position, and then driving the fixed gear 9 and the first stirring shaft paddle 5 to rotate in the reverse direction, so that the first stirring shaft paddle 5 and the second stirring shaft paddle 6 rotate repeatedly, achieving a better stirring effect on the liquid in the catalytic chamber 1;

[0043] One end of the sliding column 10 is fixed with a fixed strip 15, and a friction assembly is installed on the top of the top plate 4. The friction assembly is used to control the reset speed of the sliding column 10;

[0044] Refer to the appendix Figure 4 On the top of the top plate 4, two symmetrically arranged fixing plates 16 are fixed. The inside of the fixing plate 16 is threadedly connected with a threaded rod 20. One end of the threaded rod 20 close to the fixed strip 15 is rotatably connected with a rotating piece 19. On the side of the rotating piece 19 close to the fixed strip 15, a second spring 18 is fixed. One end of the second spring 18 close to the fixed strip 15 is fixed with a friction plate 17, and the friction plate 17 is in contact with the fixed strip 15;

[0045] When the sliding column 10 slides back and forth, it can drive the fixed strip 15 to move accordingly. Then, due to the frictional force between the friction plate 17 and the fixed strip 15, the reset of the fixed strip 15 is subject to a certain resistance. By turning the threaded rod 20, the threaded connection between the threaded rod 20 and the fixing plate 16 drives the rotating piece 19 to move towards or away from the fixed strip 15, so that the compression effect of the second spring 18 is compressed or stretched, and thus the frictional force between the friction plate 17 and the fixed strip 15 can be adjusted. It can also adjust whether the friction plate 17 is in contact with the fixed strip 15;

[0046] Through the above adjustment, the speed of the sliding column 10's reset can be adjusted. Further, the output speed of the drive motor 7 can be adjusted. Thus, there can be the following situations:

[0047] The first stirring shaft paddle 5 rotates forward quickly and reverses slowly;

[0048] The first stirring shaft paddle 5 rotates forward slowly and reverses quickly;

[0049] The first stirring shaft paddle 5 rotates forward quickly and reverses quickly;

[0050] The first stirring shaft paddle 5 rotates forward slowly and reverses slowly;

[0051] Thus, it is possible to adjust the different rotation speeds of the first stirring shaft paddle 5 according to the internal conditions of the waste oil and the catalyst. Among them, the threaded rod 20 can be replaced by electrical equipment, such as a push rod motor or a hydraulic cylinder, etc.;

[0052] On one side of the fixed block 11 close to the first spring 12 and inside the first spring 12, a limiting strip 14 is fixed, and the limiting strip 14 is slidably connected with the sliding block 13

[0053] Refer to the appendix Figures 5 - 6 An adjusting structure is installed in the catalytic chamber 1, and the adjusting structure is used to adjust the volume of the preparation space in the catalytic chamber 1;

[0054] The adjusting structure includes a sliding bottom plate 21 slidably connected to the inner side of the catalytic chamber 1, and the sliding bottom plate 21 is rotatably connected to the second stirring shaft paddle 6. A hydraulic piston cylinder 22 is fixed to the bottom of the catalytic chamber 1, and the stroke rod of the hydraulic piston cylinder 22 is vertically upward and connected to the sliding bottom plate 21;

[0055] At least one sliding strip 26 is fixed to the outer side of the second stirring shaft paddle 6, and the sliding strip 26 is slidably connected to the inner wall of the first stirring shaft paddle 5;

[0056] When the amount of waste oil and catalyst in the catalytic chamber 1 is small, the hydraulic piston cylinder 22 can be driven, so that the stroke rod of the hydraulic piston cylinder 22 drives the sliding bottom plate 21 to move upward, thereby reducing the size of the mixing space in the catalytic chamber 1. When the sliding bottom plate 21 moves upward, it can drive the second stirring shaft paddle 6 to move upward. Then, through the sliding connection between the sliding strip 26 and the first stirring shaft paddle 5, when the first stirring shaft paddle 5 rotates, it can drive the second stirring shaft paddle 6 to rotate accordingly. And when the sliding bottom plate 21 moves upward, a part of the second stirring shaft paddle 6 can slide into the first stirring shaft paddle 5;

[0057] A heating structure is installed on the top of the sliding bottom plate 21, and the heating structure is used to heat according to the height of the sliding bottom plate 21;

[0058] Refer to the appendix Figure 5 On the top of the sliding bottom plate 21 and close to the edge position, a conductive strip 23 is fixed, and the top end of the conductive strip 23 passes through the top plate 4 and bends downward to a position close to the bottom end outside the catalytic chamber 1. When the sliding bottom plate 21 moves upward, it can drive the conductive strip 23 to move upward;

[0059] A conductive block 24 is fixed to the outside of the catalytic chamber 1, and the conductive block 24 is slidably connected to the conductive strip 23. A protective frame 25 is fixed to the outside of the catalytic chamber 1 and on the outside of the conductive block 24 and the conductive strip 23. A plurality of heating strips 27 are uniformly fixed in the inner wall of the catalytic chamber 1 from top to bottom, and the plurality of heating strips 27 are connected in series;

[0060] When moving on the conductive bar 23, through its mutual contact with the conductive block 24, the lower half of the conductive bar 23 can be in contact with the conductive block 24. The conductive block 24 is electrically connected to the uppermost heating bar 27. And a contact end is provided at the part of the lowermost end of the conductive bar 23 located inside the catalytic chamber 1. This contact end can be electrically connected to each heating bar 27 when the conductive bar 23 slides, so that the heating bars 27 between the sliding bottom plate 21 and the top plate 4 generate electric heat, while the heating bars 27 below the sliding bottom plate 21 do not generate heat, thus being able to control the corresponding heating bars 27 to generate heat according to the specific volume of the stirring cavity in the catalytic chamber 1.

[0061] Embodiment 2:

[0062] A method for using a device for catalytic cracking of waste oil to prepare industrial fuel oil, which is used to describe the operation process and principle of the above device. The method includes the following steps:

[0063] By injecting waste oil into the catalytic chamber 1 and adding catalysts such as ZSM-5 molecular sieve catalyst, Y-type molecular sieve catalyst, etc. into the catalytic chamber 1 as well, it is one step of catalytically treating the waste oil to convert the waste oil into industrial fuel oil with a certain quality. And through the settings of the first stirring shaft paddle 5 and the second stirring shaft paddle 6, after the catalyst and waste oil enter the catalytic chamber 1, the first stirring shaft paddle 5 and the second stirring shaft paddle 6 stir the catalyst and waste oil, making their mixing effect better and the catalytic effect better accordingly;

[0064] Drive the drive motor 7 so that the output end of the drive motor 7 drives the notched gear 8 to rotate. Through the meshing connection between the notched gear 8 and the fixed gear 9, the notched gear 8 drives the fixed gear 9 and the first stirring shaft paddle 5 to rotate. Thus, the rotation of the first stirring shaft paddle 5 can drive the second stirring shaft paddle 6 to rotate and stir the catalyst and waste oil;

[0065] When the notched gear 8 drives the fixed gear 9 to rotate, the fixed gear 9 drives the sliding column 10 to move through the meshing connection with the sliding column 10. And when the sliding column 10 moves, it drives the sliding block 13 to move, thereby compressing the first spring 12. And when the notched gear 8 rotates to not be meshed with the fixed gear 9, the elastic force of the first spring 12 is released, and then it pushes the sliding block 13 to reset, thereby driving the sliding column 10 to reset to its original position, and then driving the fixed gear 9 and the first stirring shaft paddle 5 to rotate in the reverse direction, so that the first stirring shaft paddle 5 and the second stirring shaft paddle 6 rotate repeatedly, and the stirring effect of the liquid in the catalytic chamber 1 is better;

[0066] When the sliding column 10 slides back and forth, it can drive the fixed bar 15 to move accordingly. Then, due to the frictional force between the friction plate 17 and the fixed bar 15, there will be a certain resistance to the reset of the fixed bar 15. By turning the threaded rod 20, the threaded connection between the threaded rod 20 and the fixed plate 16 is utilized to drive the rotating piece 19 to move towards or away from the fixed bar 15, thereby enabling the compression effect of the second spring 18 to be oppressed or extended. As a result, the magnitude of the frictional force between the friction plate 17 and the fixed bar 15 can be adjusted, and whether the friction plate 17 contacts the fixed bar 15 can also be adjusted.

[0067] When the amount of waste oil and catalyst in the catalytic chamber 1 is not much, the hydraulic piston cylinder 22 can be driven, causing the stroke rod of the hydraulic piston cylinder 22 to drive the sliding bottom plate 21 to move upward, thereby reducing the size of the mixing space in the catalytic chamber 1. When the sliding bottom plate 21 moves upward, it can drive the conductive bar 23 to move upward. When the conductive bar 23 moves upward, through its mutual contact with the conductive block 24, the lower half of the conductive bar 23 comes into contact with the conductive block 24. The conductive block 24 is electrically connected to the uppermost heating strip 27, and a contact end is provided at the part of the lowermost end of the conductive bar 23 located inside the catalytic chamber 1. This contact end can be electrically connected to each heating strip 27 when the conductive bar 23 slides, so that the heating strip 27 between the sliding bottom plate 21 and the top plate 4 generates heat, while the heating strip 27 below the sliding bottom plate 21 does not generate heat. Thus, the heating of the corresponding heating strip 27 can be controlled according to the specific volume of the stirring cavity in the catalytic chamber 1. Through the setting of the protective frame 25, the protective frame 25 can protect the conductive bar 23 and the conductive block 24 to avoid electric shock.

[0068] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A device for preparing industrial fuel oil by catalytic cracking of waste oil, comprising a catalytic chamber (1), characterized in that: A top plate (4) is fixed on the top of the catalytic bin (1); at least one feed pipe (2) is arranged on the outside of the catalytic bin (1) and near the top end; at least one discharge pipe (3) is arranged on the outside of the catalytic bin (1) and near the bottom end; a first stirring shaft paddle (5) is rotatably connected inside the top plate (4) and located inside the catalytic bin (1); a second stirring shaft paddle (6) is slidably connected inside the first stirring shaft paddle (5); A driving mechanism is installed on the top of the top plate (4), and the driving mechanism is used to drive the first stirring shaft paddle (5) to rotate, and an adjustment structure is installed in the catalytic chamber (1), and the adjustment structure is used to adjust the volume of the preparation space in the catalytic chamber (1).

2. The device for preparing industrial fuel oil by catalytic cracking waste oil according to claim 1, characterized in that: The driving mechanism comprises a fixed gear (9) fixed to the outside of the first stirring shaft paddle (5) and located at the top of the top plate (4); the top of the top plate (4) is rotatably connected with a notched gear (8), and the notched gear (8) is meshingly connected with the fixed gear (9); a driving motor (7) is installed on the top plate (4), and the output end of the driving motor (7) is connected to the notched gear (8); A reset structure is installed on the side of the fixed gear (9) away from the notched gear (8), and the reset structure is used to drive the first stirring shaft paddle (5) to reset.

3. The device for preparing industrial fuel oil by catalytic cracking waste oil according to claim 2, characterized in that: The reset structure comprises a sliding column (10) slidably connected to the top of the top plate (4), and the sliding column (10) is meshingly connected with the fixed gear (9), a fixed block (11) is fixed on the top of the catalytic bin (1) and located on the side of the sliding column (10) away from the fixed gear (9), and a first spring (12) is fixed on one side of the fixed block (11), and a sliding block (13) extends from the side of the sliding column (10) away from the fixed gear (9), and the sliding block (13) is fixedly connected to the end of the first spring (12); A fixing strip (15) is fixed to one end of the sliding column (10), and a friction component is installed on the top of the top plate (4), wherein the friction component is used to control the speed of resetting the sliding column (10).

4. The device for preparing industrial fuel oil by catalytic cracking waste oil according to claim 3 is characterized in that: Two mutually symmetrical fixing plates (16) are fixed on the top of the top plate (4); a threaded rod (20) is connected to the inner thread of the fixing plate (16); one end of the threaded rod (20) close to the fixing bar (15) is rotatably connected to a rotating plate (19); a second spring (18) is fixed to one side of the rotating plate (19) close to the fixing bar (15); a friction plate (17) is fixed to one end of the second spring (18) close to the fixing bar (15); and the friction plate (17) and the fixing bar (15) are in contact with each other.

5. The device for preparing industrial fuel oil by catalytic cracking waste oil according to claim 3 is characterized in that: A limiting strip (14) is fixed on one side of the fixed block (11) close to the first spring (12) and located inside the first spring (12), and the limiting strip (14) is slidably connected to the sliding block (13).

6. The device for preparing industrial fuel oil by catalytic cracking waste oil according to claim 1, characterized in that: The regulating structure comprises a sliding bottom plate (21) slidably connected to the inner side of the catalytic bin (1), and the sliding bottom plate (21) is rotatably connected to the second stirring shaft paddle (6); a hydraulic piston cylinder (22) is fixed to the bottom of the catalytic bin (1), and a travel rod of the hydraulic piston cylinder (22) is vertically connected to the sliding bottom plate (21); At least one sliding bar (26) is fixed to the outer side of the second stirring shaft paddle (6), and the sliding bar (26) is slidably connected to the inner wall of the first stirring shaft paddle (5), and a heating structure is installed on the top of the sliding bottom plate (21), and the heating structure is used to adapt to the height of the sliding bottom plate (21) for heating.

7. The device for preparing industrial fuel oil by catalytic cracking waste oil according to claim 6, characterized in that: A conductive strip (23) is fixed on the top of the sliding bottom plate (21) and close to the edge, and the top end of the conductive strip (23) passes through the top plate (4) and is bent downward to the outside of the catalytic chamber (1) and close to the bottom end; A conductive block (24) is fixed on the outside of the catalytic chamber (1), and the conductive block (24) is slidably connected to the conductive strip (23). A protective frame (25) is fixed on the outside of the catalytic chamber (1) and located on the outside of the conductive block (24) and the conductive strip (23). A plurality of heating strips (27) are evenly fixed on the inner wall of the catalytic chamber (1) from top to bottom.

8. A method for using a device for preparing industrial fuel oil by catalytic cracking of waste oil, characterized in that: The method adopts the device according to any one of claims 1 to 7, and the method comprises the following steps: S1: injecting waste oil into the catalytic bin (1), and adding a catalyst into the catalytic bin (1), catalytically treating the waste oil, driving a driving motor (7), driving a first stirring shaft paddle (5) and a second stirring shaft paddle (6) to rotate, and stirring the catalyst and the waste oil; S2: When the notched gear (8) drives the fixed gear (9) to rotate, the fixed gear (9) drives the sliding column (10) to move by meshing with the sliding column (10), compressing the first spring (12), and when the notched gear (8) rotates to no longer mesh with the fixed gear (9), the elastic force of the first spring (12) is released, thereby pushing the sliding block (13) to reset, thereby causing the first stirring shaft paddle (5) and the second stirring shaft paddle (6) to rotate repeatedly; S3: When the sliding column (10) slides forward and backward, the fixed bar (15) can be driven to move accordingly, and the friction between the friction plate (17) and the fixed bar (15) causes a certain resistance to the return of the fixed bar (15). By twisting the threaded rod (20), the friction between the friction plate (17) and the fixed bar (15) can be adjusted, and the contact between the friction plate (17) and the fixed bar (15) can be adjusted; S4: driving the hydraulic piston cylinder (22) so that the travel rod of the hydraulic piston cylinder (22) drives the sliding bottom plate (21) to move upward, thereby reducing the size of the mixing space in the catalytic chamber (1); when the sliding bottom plate (21) moves upward, it can drive the conductive strip (23) to move upward; when the conductive strip (23) moves upward, it can be used to control the corresponding heating strip (27) to generate heat according to the specific volume of the stirring cavity in the catalytic chamber (1) through the mutual contact between the conductive strip (23) and the conductive block (24).

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