Thermal cracking unit

Abstract

The present application relates to the field of thermal cracking technology, and in particular to a thermal cracking device, which includes: a pyrolysis reactor; a connecting shaft, which is arranged in the pyrolysis reactor; the connecting shaft rotates synchronously with the pyrolysis reactor; a plurality of connecting rods, which are arranged on the connecting shaft at equal intervals, and each connecting rod extends toward the inner wall of the pyrolysis reactor; a wall scraping component, and each connecting rod is provided with a wall scraping component at one end away from the connecting shaft, and the wall scraping component can contact the pyrolysis reactor. The thermal cracking device provided by the present application has a simple structure and low manufacturing cost. More importantly, it has a good coking effect, which can effectively avoid coking on the inner wall of the pyrolysis reactor, and can also stir the material in the reactor, increase the heat transfer area, and shorten the pyrolysis time.

Description

Technical Field

[0001] The present application relates to the field of thermal cracking technology, and in particular to a thermal cracking device. Background Art

[0002] At present, pyrolysis refers to a chemical process that converts a medium (mainly high molecular polymers) into several other substances (mainly low molecular compounds) through heat energy under the condition of anaerobic or anoxic heating; the application of pyrolysis technology has not only found a good solution for the pyrolysis reduction, harmless and resource treatment of a large amount of waste generated by modern industrial production (such as waste tires, domestic sludge, oilfield sludge and other industrial solid wastes). Organic solid waste generally contains water, oil, colloid asphalt, etc. Thermal cracking of organic solid waste generally adopts a low-temperature, low-speed, rotary horizontal, partition heating, closed oxygen-free cracking kettle and pyrolysis process, which is different from incineration; in the process of heating, pyrolysis and gasification of organic solid waste, different solid wastes will produce coking and wall adhesion in different temperature zones, and stick to the inner wall of the pyrolysis kettle. The thickness of the coking layer is generally 5-15cm. Except for manual cleaning, it is generally difficult to fall off by itself; once the cracking kettle is coked and adhered to the wall, the heat absorption effect of the material is blocked, the thermal efficiency is reduced, resulting in long heating time and high energy consumption, and at the same time, it leads to serious heat storage and oxidation of the inner wall of the cracking kettle, shortening the service life of the pyrolysis kettle. Summary of the invention

[0003] The purpose of the present application is to provide a thermal cracking device to solve the technical problems in the prior art that the horizontal pyrolysis kettle is prone to produce coke that adheres to the inner wall of the pyrolysis kettle, blocking the material from absorbing heat and causing serious heat storage and oxidation of the inner wall of the cracking kettle.

[0004] The present application provides a thermal cracking device, comprising: a thermal cracking reactor;

[0005] A connecting shaft, wherein the connecting shaft is disposed in the pyrolysis reactor;

[0006] A plurality of connecting rods, wherein the plurality of connecting rods are arranged on the connecting shaft at equal intervals, each of the connecting rods extending toward the inner wall of the pyrolysis reactor; each of the connecting rods can rotate relative to the connecting shaft;

[0007] A wall scraping component is provided at one end of each connecting rod away from the connecting shaft, and the wall scraping component can contact the pyrolysis reactor.

[0008] In the above technical solution, further, the wall scraping member has a twisted plate-like or sheet-like structure;

[0009] A plurality of thorns are arranged at intervals on the surface of the wall scraping member.

[0010] In any of the above technical solutions, further, an assembly gap is formed between the side edges of two adjacent wall scraping members.

[0011] In any of the above technical solutions, further, the connecting rod includes:

[0012] A fixed rod, one end of which is rotatably connected to the connecting shaft;

[0013] A telescopic rod portion connected to an end of the fixed rod portion away from the connecting shaft, and the wall scraping member is arranged on the telescopic rod portion;

[0014] The telescopic rod portion can be extended or retracted relative to the fixed rod portion.

[0015] In any of the above technical solutions, further, the fixed rod portion is provided with a shaft sleeve, and the shaft sleeve is rotatably sleeved on the connecting shaft;

[0016] Limiting pieces are arranged on the connecting shaft at both ends of the shaft sleeve.

[0017] In any of the above technical solutions, further, the thermal cracking device further comprises a plurality of brackets; each of the brackets is connected to the inner wall of the thermal decomposition reactor;

[0018] The pyrolysis reactor has a cylindrical outer shell, and the connecting shaft is distributed along the axis of the pyrolysis reactor;

[0019] The plurality of brackets are spaced apart and distributed along the axial direction of the connecting shaft; each of the brackets is provided with a fixing portion and a leg telescopically arranged on the fixing portion, the connecting shaft is connected to the fixing portion, and the leg is connected to the inner wall surface of the pyrolysis reactor.

[0020] In any of the above technical solutions, further, the connecting shaft is provided with a plurality of pawl assemblies, and the plurality of pawl assemblies are spirally arranged on the connecting shaft along the axial direction of the connecting shaft; the inner wall of each of the sleeves is formed with a plurality of grooves, and each of the grooves corresponds to a group of the pawl assemblies;

[0021] When the connecting shaft rotates clockwise with the pyrolysis reactor, the pawl assembly is engaged with the groove portion, so that the shaft sleeve rotates synchronously with the connecting shaft;

[0022] When the connecting shaft rotates counterclockwise along with the pyrolysis reactor, the pawl assembly is not engaged with the groove.

[0023] In any of the above technical solutions, further, a portion of the connecting shaft facing the sleeve is formed with a plurality of mounting grooves, and the plurality of mounting grooves are arranged at equal intervals along the circumference of the connecting shaft;

[0024] Each of the pawl assemblies comprises a plurality of pawls and a plurality of limiting members, and each of the mounting slots is provided with a limiting member and a pawl;

[0025] The pawl is hinged to the connecting shaft, the pawl abuts against the limiting member, and the pawl always has a tendency to move away from the limiting member.

[0026] In any of the above technical solutions, further, when the pyrolysis reactor rotates clockwise, the thermal cracking device is in a discharging state, and in the discharging state, a plurality of the scraping components are spirally wound around the outer side of the connecting shaft along the axial direction of the connecting shaft; when the pyrolysis reactor rotates counterclockwise, the thermal cracking device is in a feeding state.

[0027] In any of the above technical solutions, further, a feed port is provided at one end of the pyrolysis reactor; a discharge port is provided at the other end of the pyrolysis reactor; and an auxiliary stirring member is also provided on the inner wall of the pyrolysis reactor.

[0028] Compared with the prior art, the beneficial effects of this application are:

[0029] The thermal cracking device provided in the present application includes: a pyrolysis reactor; a connecting shaft, which is arranged in the pyrolysis reactor; the connecting shaft rotates synchronously with the pyrolysis reactor; a plurality of connecting rods, which are arranged on the connecting shaft at equal intervals, and each connecting rod extends toward the inner wall of the pyrolysis reactor; a wall scraping component, and each connecting rod is provided with a wall scraping component at one end away from the connecting shaft, and the wall scraping component can contact the pyrolysis reactor.

[0030] The thermal cracking device provided in the present application has a simple structure and low manufacturing cost. More importantly, it has a good decoking effect, which can effectively avoid coking on the inner wall of the pyrolysis reactor. It can also stir the materials in the reactor, increase the heat transfer area, and shorten the pyrolysis time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of the structure of a pyrolysis reactor of a pyrolysis device provided in an embodiment of the present application;

[0033] Figure 2 Another perspective view of the pyrolysis reactor of the pyrolysis device provided in the embodiment of the present application;

[0034] Figure 3 A schematic diagram of a partial structure of a thermal cracking device provided in an embodiment of the present application;

[0035] Figure 4 for Figure 3 An enlarged schematic diagram of the thermal cracking unit at position A is provided;

[0036] Figure 5 A schematic diagram of multiple wall scraping components of a thermal cracking device provided in an embodiment of the present application in a working state;

[0037] Figure 6 A schematic diagram of multiple wall scraping components of a thermal cracking device provided in an embodiment of the present application in another working state;

[0038] Figure 7 A schematic diagram of another part of the structure of the thermal cracking device provided in an embodiment of the present application;

[0039] Figure 8 This is another partial structural schematic diagram of the thermal cracking device provided in an embodiment of the present application.

[0040] Reference numerals:

[0041] 1-pyrolysis reactor, 101-feed port, 102-discharge port, 2-connecting shaft, 201-ratchet, 202-connecting end plate, 203-limiting ring, 204-mounting groove, 205-limiting piece, 3-connecting rod, 301-fixed rod, 3011-sleeve, 3012-groove, 302-telescopic rod, 303-waist hole, 4-scraping member, 401-thorn, 5-bracket, 501-connecting sleeve, 502-connecting flange, 503-leg, 504-connecting plate, 505-fixed sleeve, 6-auxiliary stirring member. DETAILED DESCRIPTION

[0042] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0043] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0044] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0045] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] Refer to the following Figures 1 to 8 A thermal cracking device according to an embodiment of the present application is described, and the thermal cracking device includes: a pyrolysis reactor 1, a connecting shaft 2, a plurality of connecting rods 3 and a plurality of wall scraping components 4, wherein the connecting shaft 2, the plurality of connecting rods 3 and the plurality of wall scraping components 4 are all arranged in the pyrolysis reactor 1, and the pyrolysis reactor 1 rotates at a low speed with its own axis as a pivot axis during the pyrolysis reaction, and the connecting shaft 2 rotates synchronously with the pyrolysis reactor 1 in the pyrolysis reactor 1; a plurality of connecting rods 3 are arranged on the connecting shaft 2 at equal intervals along the length direction of the connecting shaft 2, and each connecting rod 3 is rotatably connected to the connecting shaft 2.

[0048] Specifically, the pyrolysis reactor 1 has a cylindrical structure and the interior of the cylinder is hollow. A feed port 101 is provided at one end of the pyrolysis reactor 1 (specifically, one end face of the cylinder), and the feed port 101 is used to transport reactant raw materials to be thermally cracked into the pyrolysis reactor 1. A discharge port 102 is provided at the other end of the pyrolysis reactor 1 (specifically, the other end face of the cylinder), and the discharge port 102 is used to discharge the product after thermal cracking.

[0049] Further, the connecting shaft 2 extends along the axis of the pyrolysis reactor 1 in the pyrolysis reactor 1, and the connecting shaft 2 is fixed in the pyrolysis reactor 1 through the bracket 5. Further, the bracket 5 includes a fixing portion and a support rod arranged on the fixing portion, the fixing portion includes a connecting sleeve 501 and a connecting flange 502 arranged at one end of the connecting sleeve 501, the number of the legs 503 is preferably three, the three legs 503 are arranged at equal intervals along the circumference of the connecting sleeve 501, one end of each leg 503 is fixedly connected to the connecting sleeve 501, and the other end of each leg 503 is provided with a connecting plate 504, at least one side of the connecting plate 504 away from the leg 503 is an arc surface, or the connecting plate 504 is an arc plate as a whole, so that the connecting plate 504 can fit with the inner wall of the pyrolysis reactor 1, and the connecting plate 504 can be connected to the inner wall of the pyrolysis reactor 1 by welding or screw connection.

[0050] Furthermore, if Figure 7 As shown, a connecting plate 504 is used to connect one end of the supporting leg 503 and is formed with a fixing sleeve 505, and one end of the supporting leg 503 is inserted into the fixing sleeve 505. Preferably, the supporting leg 503 is slidably connected to the fixing sleeve 505, or an elastic member such as a spring is provided inside the fixing sleeve 505, so that the supporting leg 503 and the fixing sleeve 505 can move along the axial direction of the supporting leg 503, thereby allowing the supporting leg 503 to expand and contract relative to the fixing sleeve 505, so that there is a certain amount of activity between the supporting leg 503 (bracket 5) and the pyrolysis reactor 1, which can eliminate the influence of the thermal expansion and contraction of the pyrolysis reactor 1 on the bracket 5.

[0051] The number of brackets 5 is preferably three, and the three brackets 5 are arranged at equal intervals along the axial direction of the connecting shaft 2. Specifically, the connecting shaft 2 is inserted into the connecting sleeve 501 of the bracket 5 located in the middle position among the three brackets 5, and a connecting end plate 202 is provided at one end of the connecting shaft 2, and the connecting end plate 202 is connected to the connecting flange 502 of the first bracket 5 among the three brackets 5. Another connecting end plate 202 is provided at the other end of the connecting shaft 2, and the connecting end plate 202 is connected to the connecting flange 502 of the last bracket 5 among the three brackets 5, so that the connecting shaft 2 can rotate synchronously with the pyrolysis reactor 1 through the bracket 5.

[0052] Furthermore, the connecting rod 3 includes a fixed rod portion 301 and a telescopic rod portion 302. A sleeve 3011 is provided at one end of the fixed rod portion 301. The sleeve 3011 is sleeved on the connecting rod 3. The diameter of the telescopic rod portion 302 is smaller than that of the fixed rod portion 301, so that the telescopic rod portion 302 can be inserted into the fixed rod portion 301.

[0053] A first connecting hole is provided near one end of the telescopic rod 302, and a second connecting hole is provided at one end of the fixed rod 301 away from the sleeve 3011, wherein at least one of the first connecting hole and the second connecting hole is a waist-shaped hole 303, and the length direction of the waist-shaped hole 303 extends along the length direction of the connecting rod 3, so that the telescopic rod 302 can be telescoped relative to the fixed rod 301. When the other end of the telescopic rod 302 is squeezed by an external force, the telescopic rod 302 can retract a certain length relative to the fixed rod 301. When the telescopic rod 302 loses the external force, the telescopic rod 302 extends a certain length relative to the fixed rod 301 again due to the action of gravity. The length of the waist-shaped hole 303 is the telescopic margin of the telescopic rod 302 relative to the fixed rod 301, so that the connecting rod 3 has a certain self-adjustment space, which can effectively prevent the connecting rod 3 from being stuck due to the out-of-roundness of the pyrolysis reactor 1.

[0054] Preferably, a plurality of limiting rings 203 are fixedly provided on the connecting shaft 2, and the sleeve 3011 is located between two limiting rings 203. The limiting ring 203 can ensure that the plurality of sleeves 3011, i.e., the plurality of connecting rods 3 are arranged at equal intervals, and can also prevent the connecting rods 3 from moving in the axial direction of the connecting shaft 2.

[0055] Furthermore, the number of the wall scraping components 4 is the same as the number of the connecting rods 3 , and one end of the telescopic rod portion 302 of each connecting rod 3 away from the fixed rod portion 301 is provided with a wall scraping component 4 .

[0056] The scraper member 4 has a flat plate structure, and the center line of the scraper member 4 extending along its width direction coincides with the axis of the connecting rod 3. Preferably, the scraper member 4 itself is twisted, specifically, Figure 3 In the state shown, with the telescopic rod portion 302 as the boundary, the plate surfaces of the scraping members 4 distributed on both sides of the telescopic rod portion 302 are not in the same plane, so that when the scraping members 4 are swung with the connecting rod 3 in the pyrolysis reactor 1, they can not only contact with the inner wall of the pyrolysis reactor 1, thereby performing a reciprocating scraping action with the pyrolysis reactor 1 to avoid coking on the inner wall of the pyrolysis reactor 1, but also can enhance the stirring effect of the material when the pyrolysis reactor 1 rotates at a low speed, promote the thermal cracking reaction process, and reduce the time required for pyrolysis.

[0057] Furthermore, a plurality of thorns 401 are arranged at intervals on both side surfaces of the scraper member 4 to prevent the material from adhering to the scraper member 4 and to easily break up the agglomerated oil sludge, so that the material is heated more evenly and the pyrolysis is accelerated.

[0058] Furthermore, under the natural state, due to the action of gravity, each connecting rod 3 and the scraper member 4 arranged at the end of the connecting rod 3 naturally droop, and an assembly gap is formed between the side walls of two adjacent scraper members 4. The assembly gap is not specifically limited here. Under the premise of ensuring that any two adjacent scraper members 4 do not contact or affect each other, the smaller the assembly gap, the better, thereby ensuring that as the pyrolysis reactor 1 rotates, the scraping range of multiple scraper members 4 can cover the inner wall surface of the side wall of the pyrolysis reactor 1.

[0059] Further, the inner diameter of the sleeve 3011 is slightly larger than the diameter of the connecting shaft 2, and the inner wall of the sleeve 3011 is formed with a plurality of grooves 3012. Preferably, the number of the grooves 3012 is three, and the three grooves 3012 are arranged at equal intervals. The surface of the connecting shaft 2 is formed with mounting grooves 204 having the same number as the grooves 3012. Preferably, in this embodiment, the number of the mounting grooves 204 is also three, and the three mounting grooves 204 are arranged at equal intervals on the surface of the connecting shaft 2 along the circumference of the connecting shaft 2. A group of pawl assemblies are arranged in each mounting groove 204. Further, the pawl assembly includes a pawl 201 and a limiting member 205, wherein the pawl 201 has a rod structure and at least the shape of the end portion of the pawl 201 is adapted to the groove 3012. The pawl 201 is rotatably arranged on the connecting shaft 2 in a hinged manner. The limiting member 205 has a rod structure and is arc-shaped. Preferably, the limiting member 205 is elastic. 01 is in contact with or released from the limit member 205, so that the limit member 205 can apply elastic force to the pawl 201, so that the pawl 201 has a movement tendency to move away from the limit member 205 and relative to the mounting groove 204. When the sleeve 3011 and the connecting shaft 2 are in a specific position and the connecting shaft 2 rotates in a specific direction, the pawl 201 is just stuck in the groove 3012. At this time, the connecting rod 3 can rotate synchronously with the connecting shaft 2. In the state other than the specific position, the pawl 201 is separated from the groove 3012 and abuts against the wall surface of the sleeve 3011 other than the groove 3012 so that the pawl 201 is forced to retract into the mounting groove 204. At this time, the connecting rod 3 and the wall scraper 4 naturally droop due to gravity. At the same time, as the connecting shaft 2 and the pyrolysis reactor 1 rotate synchronously, the wall scraper 4 contacts the material to stir the material on the one hand, and on the other hand, the wall scraper 4 swings back and forth with the connecting rod 3 to scrape the inner wall of the pyrolysis reactor 1.

[0060] Specifically, if Figure 5As shown, when the connecting shaft 2 rotates clockwise with the pyrolysis reactor 1, the pawl 201 is just located in the groove 3012 or after the connecting shaft 2 rotates clockwise for a certain angle until the pawl 201 is located in the groove 3012, the pawl 201 pushes the sleeve 3011 to rotate clockwise synchronously with the connecting shaft 2. At this time, the thermal cracking device as a whole has a first working state, and the first working state corresponds to the discharge state of the thermal cracking device after the thermal cracking process is completed.

[0061] The connecting shaft 2 is formed with pawls 201 of the same number as the connecting rods 3 at equal intervals along its axial direction, and multiple pawls 201 are spirally distributed on the surface of the connecting shaft 2 along the axis of the connecting shaft 2, so that when each pawl 201 is located in the corresponding groove 3012, each connecting rod 3 extends along the radial direction of the connecting shaft 2 to be vertically arranged with the connecting shaft 2, and at the same time, multiple wall scraping components 4 are continuously spirally distributed along the axial direction of the connecting shaft 2 so that multiple wall scraping components 4 form wall scraping spirals, and multiple connecting rods 3 and multiple wall scraping components 4 can maintain this state and rotate synchronously clockwise with the pyrolysis reactor 1. Such a structure can accelerate the discharge of materials after thermal cracking through the discharge port 102, and significantly improve the discharge speed and discharge efficiency of the thermal cracking device.

[0062] When the connecting shaft 2 rotates counterclockwise with the pyrolysis reactor 1, the pawl 201 gradually moves away from the groove 3012, and is squeezed by the inner wall of the sleeve 3011 so that the pawl 201 can move closer to the connecting shaft 2. At this time, no matter how many angles and how many circles the connecting shaft 2 rotates with the pyrolysis reactor 1, the sleeve 3011 will not rotate counterclockwise synchronously with the connecting shaft 2, and the connecting rod 3 always remains in a naturally drooping state. As the scraping member 4 contacts the material, the connecting rod 3 and the scraping member 4 can swing naturally, and the connecting rod 3 and the scraping member 4 can always maintain this state. This state is the second working state, which is also the working state of the pyrolysis device during the pyrolysis process. In this state, on the one hand, the material is stirred, and on the other hand, the inner wall of the pyrolysis reactor 1 is scraped to avoid coking.

[0063] Furthermore, an auxiliary stirring member 6 is provided on the inner wall of the pyrolysis reactor 1 near the discharge port 102. The auxiliary stirring member 6 is arc-shaped as a whole and also has a twisted structure, which can make up for the deficiency of a stirring blind spot caused by the inability to set a connecting member and a scraping member 4 at the end near the discharge port 102. When the material contacts and collides with the auxiliary stirring member 6 during the thermal cracking process, the auxiliary stirring member 6 can assist in stirring the material. During the discharging process, as the scraping spiral rotates, the material is transported toward the discharge port 102, and first passes through the auxiliary stirring member 6 before being discharged through the discharge port 102, which can break up the material for a second time to avoid material agglomeration and prevent the material from blocking the discharge port 102.

[0064] In summary, the pyrolysis device provided by the present application has a simple structure and low manufacturing cost. More importantly, it has a good coke removal effect, effectively avoiding coking on the inner wall of the pyrolysis reactor, and can also stir the materials in the reactor to increase the heat transfer area and shorten the pyrolysis time. In addition, during the discharging process of the pyrolysis device provided by the present application, multiple wall scraping components are deformed into wall scraping spirals, which can greatly reduce the discharging time and improve the discharging efficiency.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A thermal cracking device, characterized in that: include: Pyrolysis reactor; A connecting shaft, wherein the connecting shaft is disposed in the pyrolysis reactor; A plurality of connecting rods, wherein the plurality of connecting rods are arranged on the connecting shaft at equal intervals, each of the connecting rods extending toward the inner wall of the pyrolysis reactor; each of the connecting rods can rotate relative to the connecting shaft; A wall scraping member, wherein one end of each connecting rod away from the connecting shaft is provided with the wall scraping member, and the wall scraping member can contact the pyrolysis reactor; The wall scraping member has a twisted plate-like or sheet-like structure; The surface of the wall scraping member is provided with a plurality of thorns at intervals; The connecting rod comprises: A fixed rod, one end of which is rotatably connected to the connecting shaft; A telescopic rod portion connected to an end of the fixed rod portion away from the connecting shaft, and the wall scraping member is arranged on the telescopic rod portion; The telescopic rod can be extended or retracted relative to the fixed rod; The fixed rod portion is provided with a shaft sleeve, and the shaft sleeve is rotatably sleeved on the connecting shaft; Limiting members are arranged on the connecting shaft at both ends of the sleeve; The connecting shaft is provided with a plurality of pawl assemblies, and the plurality of pawl assemblies are arranged on the connecting shaft in a spiral shape along the axial direction of the connecting shaft; the inner wall of each of the shaft sleeves is formed with a plurality of grooves, and each of the grooves corresponds to a group of the pawl assemblies; When the connecting shaft rotates clockwise with the pyrolysis reactor, the pawl assembly is engaged with the groove portion, so that the shaft sleeve rotates synchronously with the connecting shaft; When the connecting shaft rotates counterclockwise along with the pyrolysis reactor, the pawl assembly is not engaged with the groove.

2. The thermal cracking device according to claim 1, characterized in that: An assembly gap is formed between the side edges of two adjacent wall scraping components.

3. The thermal cracking device according to claim 1, characterized in that: The thermal cracking device further comprises a plurality of brackets; each of the brackets is connected to the inner wall of the thermal decomposition reactor; The pyrolysis reactor has a cylindrical outer shell, and the connecting shaft is distributed along the axis of the pyrolysis reactor; The plurality of brackets are spaced apart and distributed along the axial direction of the connecting shaft; each of the brackets is provided with a fixing portion and a leg telescopically arranged on the fixing portion, the connecting shaft is connected to the fixing portion, and the leg is connected to the inner wall surface of the pyrolysis reactor.

4. The thermal cracking device according to claim 1, characterized in that: A portion of the connecting shaft facing the sleeve is formed with a plurality of mounting grooves, and the plurality of mounting grooves are arranged at equal intervals along the circumference of the connecting shaft; Each of the pawl assemblies comprises a plurality of pawls and a plurality of limiting members, and each of the mounting slots is provided with a limiting member and a pawl; The pawl is hinged to the connecting shaft, the pawl abuts against the limiting member, and the pawl always has a tendency to move away from the limiting member.

5. The thermal cracking device according to claim 1, characterized in that: When the pyrolysis reactor rotates clockwise, the thermal cracking device is in a discharging state. In the discharging state, a plurality of the scraping components are spirally wound around the outer side of the connecting shaft along the axial direction of the connecting shaft; when the pyrolysis reactor rotates counterclockwise, the thermal cracking device is in a feeding state.

6. The thermal cracking device according to any one of claims 1 to 4, characterized in that: A feed port is arranged at one end of the pyrolysis reactor; a discharge port is arranged at the other end of the pyrolysis reactor; and an auxiliary stirring member is also arranged on the inner wall of the pyrolysis reactor.

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