Rubber asphalt preparation pyrolysis furnace

Abstract

This invention discloses a pyrolysis furnace for preparing rubber asphalt, belonging to the field of rubber asphalt processing equipment. It includes a furnace body and a gas delivery pipe connected to the furnace body for conveying pyrolysis gas. The pyrolysis chamber of the furnace body is a cylindrical cavity, and the furnace body can rotate. A heating chamber for heating the furnace body is located below the furnace body. The axis of the pyrolysis chamber is horizontally installed, and the furnace body can rotate around the horizontal axis. The left and right ends of the furnace body are rotatably installed. A scraper is also provided inside the furnace body, which can rotate within the pyrolysis chamber while closely adhering to the inner wall of the pyrolysis chamber. A piston disc is also provided inside the pyrolysis chamber, and a venting device is installed at one end of the pyrolysis chamber. When the venting device is connected to a vacuum device, the piston disc can slide along the axial direction of the pyrolysis chamber until it is in close contact with the inner wall of the pyrolysis chamber on the side where the venting device is located. This invention can effectively prevent the rubber material from concentrating and adhering to the furnace wall during heating in the pyrolysis furnace, ensuring the uniformity of heating of the rubber material inside the furnace, and the venting operation is simpler and more intuitive.

Description

Technical Field

[0001] This invention relates to the field of rubber asphalt processing equipment, specifically a pyrolysis furnace for preparing rubber asphalt. Background Technology

[0002] One of the most crucial steps in the preparation of rubber asphalt is the pyrolysis treatment of waste rubber materials, typically carried out in a pyrolysis furnace. At the beginning of pyrolysis, the furnace must be vented to ensure the rubber material operates in a relatively enclosed environment, preventing the negative impact of large amounts of air inside the furnace on the pyrolysis process. Current venting methods mainly involve directly extracting the internal air, but the degree of venting is difficult to visually assess. While pressure gauges can be used for direct measurement, their performance is extremely limited in such an environment, and their installation is inconvenient, as they are always difficult to operate near the furnace.

[0003] Furthermore, existing pyrolysis furnaces include fixed and rotary types. Considering the need to reduce adhesion between the rubber compound and the furnace inner wall during heating, rotary structures are increasingly being adopted. However, current rotary furnaces, if rotating along a vertical axis, have extremely limited automatic mixing of the rubber compound, resulting in significant accumulation of rubber at the bottom of the furnace or adhesion to the inner wall due to heating, affecting the uniformity of heating during pyrolysis. On the other hand, if a horizontal rotary installation is used, the output of pyrolysis gas becomes inconvenient because the furnace rotates around a horizontal line. Therefore, the gas delivery pipe for outputting pyrolysis gas is usually coaxially connected to the horizontal axis of the furnace. If the space below is filled with rubber material, it will easily clog the connection between the gas pipeline and the furnace body. In other words, the efficiency of pyrolysis gas delivery will be extremely low. The rubber material will accumulate in other areas of the furnace body away from the gas pipeline, especially in the empty area at the top inside the furnace body. This is because, on the one hand, the hot gas flow rises; on the other hand, most of the space below the furnace body has been used to accumulate rubber material, while a small portion of the upper space is empty. This is also a necessary requirement for loading material into the furnace body, which cannot be filled completely. Therefore, theoretically, a lot of pyrolysis gas will accumulate in this empty area at the top, causing poor exhaust and untimely delivery of pyrolysis gas. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a pyrolysis furnace for preparing rubber asphalt. One of the problems it solves is that rubber materials tend to adhere to the furnace wall inside the pyrolysis furnace, and that venting the furnace before pyrolysis is not simple and direct enough, making it difficult to determine whether venting is necessary.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A pyrolysis furnace for preparing rubber asphalt includes a furnace body and a gas supply pipe connected to the furnace body for conveying pyrolysis gas. The pyrolysis chamber of the furnace body is a cylindrical cavity, and the furnace body can rotate. A heating chamber for heating the furnace body is provided below the furnace body. The axis of the pyrolysis chamber is horizontally installed, and the furnace body can rotate around the horizontal axis. The left and right ends of the furnace body are respectively rotatably installed. A scraper is also provided inside the furnace body. The scraper can rotate within the pyrolysis chamber while closely adhering to the inner wall of the pyrolysis chamber. A piston disc is also provided inside the pyrolysis chamber. An air venting device is installed at one end of the pyrolysis chamber. When the air venting device is connected to a vacuum pump and is working, the piston disc can slide along the axial direction of the pyrolysis chamber until it is close to the inner wall of the pyrolysis chamber on the side where the air venting device is located.

[0009] Furthermore, a first gear is coaxially fixed to another part of the pyrolysis chamber. The first gear meshes with a third gear through a rotatably mounted second gear. The gear shaft of the third gear is coaxially and rotatably mounted at the end of the furnace body. An L-shaped scraper is fixed to one end of the gear shaft located inside the pyrolysis chamber.

[0010] Furthermore, one end of the piston disc is flat, and the other end has a groove extending radially therein. The groove allows the vertical section of the scraper to be submerged in it. The horizontal section of the scraper passes horizontally along the cylindrical surface of the piston disc, and the piston disc can slide along the horizontal section in a direction parallel to the axial direction of the pyrolysis chamber.

[0011] Furthermore, the venting device includes a venting pipe fixed to the end of the furnace body. Inside the venting pipe, a sliding rod that slides only axially is connected by a return spring located at its end. One end of the sliding rod is located inside the venting pipe, and a sliding pin is elastically and telescopically installed on the side wall of that end.

[0012] A pin is coaxially located at the center of the end of the piston disc. The end of the pin has a blind hole, and the wall of the blind hole has an annular slot. When the vent pipe is connected to the vacuum device to vent air, the piston disc moves toward the vent pipe and presses against the inner wall of the pyrolysis chamber. After the pin is inserted into the vent pipe, its sliding pin is engaged in the annular slot for fixed connection.

[0013] Furthermore, a limiting plate is provided at the end of the vent pipe away from the furnace body. The return spring is sleeved on the slide rod between the limiting plate and the vent pipe. Several locking screws are threaded onto the limiting plate. When the locking screws are screwed into the vent pipe, they can press tightly against the end face of the vent pipe, so that the slide rod and the piston plate generate an axial tension through the engagement of the sliding pin and the annular slot.

[0014] Furthermore, an indicator rod is fixed to the side of the limiting plate. When the indicator rod corresponds to a set scale on a fixed scale, the tensioning effect is generated between the slide rod and the piston plate.

[0015] Furthermore, the vacuum equipment is connected to an annular cover via a vacuum pipe. The annular cover is coaxially positioned outside the exhaust pipe and dynamically sealed to the exhaust pipe. The exhaust pipe has several air outlets, all of which are located inside the annular cover.

[0016] Furthermore, an exhaust section connected to the gas supply pipe is provided on the side of the furnace body. The exhaust section includes a filter plate embedded in and fixed on an exhaust hole opened in the inner wall of the pyrolysis chamber. The filter plate is located at the inlet end of the exhaust hole, and the middle hole wall of the exhaust hole has several strip-shaped grooves for ventilation.

[0017] A sliding block is also axially slidably installed inside the exhaust hole. The longitudinal section of the sliding block has a T-shaped structure. The section of the sliding block near the filter plate has a blind cavity. The side wall of the blind cavity is provided with several through holes. When the furnace body rotates to the point where the exhaust hole is below, the sliding block slides down to block the outlet end of the exhaust hole due to its own weight. When the furnace body rotates to the point where the exhaust hole is above, the sliding block slides down to the position that fits the filter plate due to its own weight. At this time, the through holes are connected to the groove section of the strip groove on the side near the filter plate.

[0018] Furthermore, a high-temperature resistant limiting spring is connected between the filter plate and the sliding block. The limiting spring controls the axial sliding amount of the sliding block within the exhaust hole when the sliding block rotates together with the furnace body.

[0019] Furthermore, the present invention also includes a gas collecting hood coaxially disposed above the furnace body. The gas collecting hood is curved in an arc shape with a Π-shaped cross-section. The opening side of the gas collecting hood is dynamically sealed and rotated with the furnace body, so that the gas collecting hood and the outer wall of the furnace body form a relatively closed environment during the rotation of the furnace body. Each end of the gas collecting hood is elastically damped and hinged with a door plate. The two door plates can be pushed open one by one by the protrusion on the furnace body where the exhaust hole is located during the rotation of the furnace body. When the through hole is connected to the groove section of the strip groove on the side near the filter plate, the protrusion is moving in a circular motion with the furnace body inside the gas collecting hood.

[0020] (III) Beneficial Effects

[0021] This invention provides a pyrolysis furnace for preparing rubber asphalt, which has the following beneficial effects:

[0022] 1. The horizontal rotating installation of the furnace body in this invention allows the rubber material inside the furnace to roll off automatically, avoiding concentrated adhesion to the inner wall of the furnace at high temperatures, and facilitating uniform heating and decomposition.

[0023] 2. It has a scraper that rotates in conjunction with the furnace body to specifically scrape off the rubber material on the inner wall of the furnace, thus better preventing the rubber material from sticking to the inner wall of the furnace when heated.

[0024] 3. Using a mechanical piston disc to move and vent not only provides a good venting effect, but also allows for a direct view of whether venting is complete, avoiding the limitations of using a pressure gauge at high temperatures.

[0025] 4. The automatic mechanical intermittent pyrolysis gas discharge method is well matched with the overall structural design of the present invention, avoiding the disadvantage of horizontal rotary furnaces not being able to discharge gas well. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the pyrolysis furnace structure according to one embodiment of the present invention;

[0027] Figure 2 A structural diagram of a venting device;

[0028] Figure 3 for Figure 1 Enlarged view of the structure within the thin line region of the middle ellipse;

[0029] Figure 4 for Figure 1 The side view of the gas collection hood shown;

[0030] Figure 5 This is a cross-sectional view of one end of the gas collection hood.

[0031] In the diagram: Furnace body 1, scraper 2, piston disc 3, first gear 4, second gear 5, third gear 6, gear shaft 7, pin 8, blind hole 9, annular slot 10, slide rod 11, sliding pin 12, return spring 13, limit disc 14, locking screw 15, blind cavity 16, indicator rod 17, scale 18, gas supply pipe 19, annular cover 20, vent pipe 21, gas outlet 2101, protrusion 22, filter plate 23, sliding block 24, through hole 25, strip groove 26, gas collection cover 27, door panel 28. Detailed Implementation

[0032] This specification will clearly and completely describe the technical solutions in the following embodiments based on the accompanying drawings. The embodiments described in this specification are only some embodiments of the present invention, not all embodiments. All other embodiments derived by those skilled in the art based on these embodiments without creative effort should fall within the protection scope of the present invention.

[0033] like Figure 1The structure shown is a simplified diagram of the pyrolysis furnace for preparing rubber asphalt in this embodiment. Like existing pyrolysis furnaces, it mainly includes a furnace body 1, a carrier for holding and heating rubber, and a gas delivery pipe 19 connected to the furnace body 1 for conveying pyrolysis gas. The gas delivery pipe 19 is used to transport the pyrolysis gas phase generated by pyrolysis to subsequent processes. One difference in this embodiment is that the pyrolysis chamber of the furnace body 1 is not only a cylindrical cavity, but the furnace body 1 can also rotate. A heating chamber for heating the furnace body 1 is located below it. Furthermore, the axis of the pyrolysis chamber is horizontally installed, and the furnace body 1 is horizontally installed. During heating, the furnace body 1 can rotate around the horizontal axis above the combustion chamber, causing the rubber material inside to continuously tumble, making it less likely to adhere to the inner wall of the furnace body 1 and cause overheating, and preventing severe uneven heating of the remaining rubber material inside the furnace body 1. Specifically, as... Figure 1 As shown, the left and right ends of the furnace body 1 are rotatably installed. Inside the furnace body 1, there is also a scraper 2. The scraper 2 can closely adhere to the inner wall of the pyrolysis chamber, thereby rotating inside the pyrolysis chamber and scraping off some of the rubber material still adhering to the inner wall. At the same time, in this embodiment, in order to achieve as much closed heating as possible and isolate the air from the reaction, a piston disc 3 is also provided inside the pyrolysis chamber, and an air venting device is installed at one end of the pyrolysis chamber. This air venting device is connected to a vacuum device or other air extraction device. When the air venting is performed, the piston disc 3 can slide along the axial direction of the pyrolysis chamber until it is close to the inner wall of the pyrolysis chamber on the side where the air venting device is located, thereby ensuring that the air inside the furnace body 1 is pushed out. Since the air inside the furnace body 1 has been almost completely vented when the piston disc 3 moves to its limit, the air venting situation can be directly monitored without the need for pressure gauges, as pressure gauges are not practical at such high temperatures, have a high failure rate, and are costly to purchase, install, use, and maintain.

[0034] More specifically, such as Figure 1 A first gear 4 is coaxially fixed to another part of the pyrolysis chamber, meaning that at least one first gear 4 is fixed to the other end of the furnace body 1. This first gear 4 meshes with a third gear 6 via a rotatably mounted second gear 5. The second gear 5 can be installed on a corresponding structure, with the design chosen to adapt to the specific installation environment on site. The gear shaft 7 of the third gear 6 is coaxial and rotatably mounted at the end of the furnace body 1. An L-shaped scraper 2 is fixed to one end of the gear shaft 7 located inside the pyrolysis chamber. The horizontal section of the scraper 2 is attached to the inner wall of the pyrolysis chamber, while its vertical section is attached to the inner end face of the pyrolysis furnace, thereby effectively scraping off the rubber material.

[0035] As one of the implementation structures, for example Figure 1One end of the piston disc 3 is flat, and the other end has a groove extending radially. The groove allows the vertical section of the scraper 2 to be submerged, and correspondingly, the horizontal section of the scraper 2 passes horizontally along the cylindrical surface of the piston disc 3. In this case, the scraper 2 is actually shaped like a right angle ruler, and the piston disc 3 can slide along the horizontal section in a direction parallel to the axial direction of the pyrolysis chamber. This ensures that during operation, as the furnace body 1 rotates around a horizontal line, the scraper 2 also rotates around a horizontal line, effectively preventing rubber material from adhering to the inner wall of the furnace body 1. Furthermore, their directions can be opposite, resulting in more thorough removal of rubber material from the inner wall of the furnace body 1. In addition, during use, when venting is required, the horizontal movement of the piston plate is not affected regardless of whether the scraper 2 rotates.

[0036] For venting design, such as Figure 2 This venting device includes a vent pipe 21 fixed to the end of the furnace body 1. A sliding rod 11, which slides only axially, is connected to the vent pipe 21 via a return spring 13 located at its end. Specifically, the return spring 13 can be sleeved on the outside of the sliding rod 11. One end of the sliding rod 11 is located inside the vent pipe 21, and a sliding pin 12 is elastically and telescopically installed on the side wall of that end. That is, the sliding pin 12 is installed inside the sliding rod 11 by a spring, and in its natural state, it protrudes from the surface of the sliding rod 11. Meanwhile, a pin 8 is coaxially located at the center of the end of the piston plate 3. The end of the pin 8 has a blind hole 9, preferably with a flared chamfer at the opening. An annular slot 10, i.e., an annular groove structure, is located on the wall of the blind hole 9. The figure only shows the unclosed state of the annular slot 10, i.e., the arc path corresponding to the annular slot 10 is less than 2π. However, in actual manufacturing, the path is preferably a closed circle, allowing the piston plate to quickly engage with the sliding pin 12 at any position without additional limiting. When the vent pipe 21 is connected to the vacuum equipment to vent air, a negative pressure is generated inside the furnace body 1, that is, a negative pressure is generated inside the pyrolysis chamber. The piston disc 3 moves towards the vent pipe 21, so that it can fit tightly against the inner wall of the pyrolysis chamber. After the pin 8 is inserted into the vent pipe 21, its sliding pin 12 is also engaged into the annular slot 10 and fixedly connected. The two will not separate under axial external force. To ensure a stable connection between the two, such as Figure 2A limiting plate 14 is located at the end of the vent pipe 21 facing away from the furnace body 1. A return spring 13 is sleeved on the slide rod 11 between the limiting plate 14 and the vent pipe 21. Several locking screws 15 are threaded onto the limiting plate 14. A portion of the locking screws 15 is pre-screwed into the limiting plate 14 for pre-installation. When the locking screws 15 are screwed into the vent pipe 21, they can just press tightly against the end face of the vent pipe 21, thus pulling the limiting plate 14 towards the side facing away from the vent pipe 21. This allows the slide rod 11 and the piston disc 3 to be axially tightened through the engagement of the sliding pin 12 and the annular slot 10, thus fixing the piston disc 3 after venting and preventing it from moving to other positions in the pyrolysis chamber and interfering with the movement of the internal rubber material. To visually determine whether the piston disc 3 is fixed or whether the venting is sufficient, such as... Figure 2 As shown, an indicator rod 17 can be fixed on the side of the limiting plate 14. When the indicator rod 17 corresponds to the set scale on a fixed scale 18, it indicates that the slide rod 11 and the piston plate 3 have reached the connection position, that is, the slide rod 11 and the piston plate 3 are tensioned.

[0037] As another implementation detail, such as Figure 2 This vacuum equipment (not shown in the figure) can be connected to an annular cover 20 via a vacuum pipe. The annular cover 20 is coaxially positioned outside the exhaust pipe 21 and is dynamically sealed to the exhaust pipe 21. That is, when the two rotate relative to each other, the mating contact surfaces do not leak air. Specifically, graphite seals can be used, such as graphite gaskets or graphite bushings, because graphite has both lubricating and wear-resistant properties and extremely high temperature resistance. The exhaust pipe 21 has several air outlets 2101, all of which are located inside the annular cover 20. This allows air to flow into the annular cover 20 through the air outlets 2101 during the evacuation process and then be discharged. When the exhaust is complete, the piston plate seals the end of the exhaust pipe 21.

[0038] Furthermore, since the furnace body 1 is installed in a rotating horizontal configuration, for the output of pyrolysis gas, in addition to the traditional method of setting up high-temperature resistant pipes for exhaust, such as installing the exhaust pipe inside the aforementioned gear shaft 7, or using the gear shaft 7 as the gas delivery pipe 19, this method, although it can output pyrolysis gas without affecting the rotation of the furnace body 1, will not be able to exhaust fully due to the obstruction of the rubber material in the middle. Therefore, this embodiment recommends setting up a special structure to specifically match this design, such as... Figure 2An exhaust section connected to the gas supply pipe 19 is provided on the side of the furnace body 1. This exhaust section includes a filter plate 23 embedded in and fixed to an exhaust hole opened in the inner wall of the pyrolysis chamber for filtration. More specifically, the filter plate 23 is located at the inlet end of the exhaust hole, and the middle wall of the exhaust hole has several strip-shaped grooves 26 for ventilation, similar to spline keyways. This design allows the sliding block 24 to slide and also to exhaust gas when it reaches a predetermined position. On the other hand, a sliding block 24 also needs to be axially slidably installed inside the exhaust hole. The longitudinal section of the sliding block 24 has a T-shaped structure, such as a stepped frustum structure. The section of the sliding block 24 near the filter plate 23 has a blind cavity 16. The side wall of the blind cavity 16 has several through holes 25, which can be arranged in a ring array. When the furnace body 1 rotates to such a position... Figure 1 and Figure 3 When the exhaust port is at the bottom, the sliding block 24 slides downwards due to its own weight to block the outlet end of the exhaust port, and no exhaust is emitted. However, when the furnace body 1 rotates to the top position of the exhaust port (not shown in the figure), as described above, those skilled in the art will understand that the sliding block 24 slides downwards due to its own weight to the position of adhering to the filter plate 23. At this time, the through hole 25 connects with the groove section of the strip groove 26 on the side of the filter plate 23, and the internal pyrolysis gas will be emitted. It should be noted that the above-mentioned venting and non-venting does not only depend on whether the exhaust port is rotated to the highest or lowest point, but rather that venting or non-venting is required within a certain range of movement between the horizontal position from the highest point and the horizontal position from the lowest point. This allows for adaptive design selection. To control this position range, a high-temperature resistant limiting spring (not shown in the figure) can be connected between the filter plate 23 and the sliding block 24. One end of this limiting spring can be installed in the aforementioned blind cavity 16. Specifically, a high-temperature resistant nickel-based alloy spring of 500-900℃ can be used. The limiting spring controls the axial sliding amount of the sliding block 24 in the exhaust hole when it rotates with the furnace body 1. For example, if the spring stiffness coefficient is large, it is difficult to compress. Therefore, to achieve the goal of pressing the limiting spring down to the position where the sliding block 24 contacts the filter plate 23 when the sliding block 24 reaches the upper position with the furnace body 1, it is necessary to rotate to a higher position and rely on more of the component of gravity in the corresponding direction. This is also one of the design motivations for the installation structure of the sliding block 24. Considering the performance of the spring at high temperatures, it does not rely entirely on the limiting spring, but to a certain extent, it relies on the influence of the component of the weight of the sliding block 24 in the sliding direction on the movement of the sliding block 24 when it is in the inclined position.

[0039] To achieve this design result and facilitate the discharge of cracked gas, this embodiment, for example... Figure 1 and Figure 4It also includes a gas collecting hood 27 coaxially mounted above the furnace body 1. The gas collecting hood 27 is curved in an arc shape with a Π-shaped cross-section. The opening side of the gas collecting hood 27 is dynamically sealed and rotates with the surface of the furnace body 1, so that during the rotation of the furnace body 1, the gas collecting hood 27 and the outer wall of the furnace body 1 form a relatively closed environment to prevent gas leakage. In addition, such as Figure 4-5 Each end of the gas collecting hood 27 is elastically damped and hinged with a door panel 28. The two door panels 28 can be pushed open one by one by the protrusions 22 on the furnace body 1 where the exhaust port is located as the furnace body 1 rotates. When the through hole 25 connects with the groove section of the strip groove 26 near the filter plate 23, allowing the pyrolysis gas to be discharged, the protrusions 22 are moving in a circular motion within the gas collecting hood 27 along with the furnace body 1, causing the discharged pyrolysis gas to exit from the gas collecting hood 27. The door panels 28 can automatically close under elastic action after being pushed open by the protrusions 22.

[0040] It should be clarified here that, in this specification, terms such as "first" and "second" are merely used to distinguish one feature from another, and do not imply any inherent relationship or order between these technical features. The terms "comprising" and "including" mean that something contains one or more technical means or features, specifically referring to other existing or non-existent technical features not listed above. The descriptions in the above embodiments are merely representative examples for the purposes of this invention and are not the only limiting features. Those skilled in the art should understand that, without departing from the technical content described in all claims of this application, simple substitutions and modifications can be made to create different or equivalent specific embodiments and application scenarios. However, regardless of these adaptive changes, all such embodiments must fall within the protection scope of this invention.

Claims

1. A pyrolysis furnace for preparing rubber asphalt, comprising a furnace body (1) and a gas supply pipe (19) connected to the furnace body (1) for supplying pyrolysis gas, wherein the pyrolysis chamber of the furnace body (1) is a cylindrical cavity, the furnace body (1) is rotatable, and a heating chamber for heating the furnace body (1) is provided below the furnace body (1); characterized in that, The pyrolysis chamber is horizontally mounted on its axis, and the furnace body (1) can rotate around the horizontal axis. The left and right ends of the furnace body (1) are rotatably mounted respectively. A scraper (2) is also provided inside the furnace body (1). The scraper (2) can rotate inside the pyrolysis chamber while closely adhering to the inner wall of the pyrolysis chamber. A piston disc (3) is also provided inside the pyrolysis chamber. A venting device is installed at one end of the pyrolysis chamber. When the venting device is connected to a vacuum pump and is working, the piston disc (3) can slide along the axial direction of the pyrolysis chamber until it is closely adhering to the inner wall of the pyrolysis chamber on the side where the venting device is located. An exhaust section connected to the gas supply pipe (19) is provided on the side of the furnace body (1). The exhaust section includes a filter plate (23) embedded in and fixed on an exhaust hole opened in the inner wall of the pyrolysis chamber. The filter plate (23) is provided at the inlet end of the exhaust hole. The middle hole wall of the exhaust hole has several strip-shaped grooves (26) for ventilation. A sliding block (24) is also axially slidably installed in the exhaust hole. The longitudinal section of the sliding block (24) is T-shaped. The section of the sliding block (24) near the filter plate (23) has a blind cavity (16). The side wall of the blind cavity (16) is provided with several through holes (25). When the furnace body (1) rotates to the point where the exhaust hole is below, the sliding block (24) slides down to block the outlet end of the exhaust hole due to its own weight. When the furnace body (1) rotates to the point where the exhaust hole is above, the sliding block (24) slides down to the position where it fits the filter plate (23) due to its own weight. At this time, the through hole (25) is connected to the groove section of the strip groove (26) on the side near the filter plate (23). It also includes a gas collection hood (27) coaxially arranged above the furnace body (1). The gas collection hood (27) is curved in an arc shape and has a Π-shaped cross section. The opening side of the gas collection hood (27) is dynamically sealed and rotated with the furnace body (1) so that the gas collection hood (27) and the outer wall of the furnace body (1) form a relatively closed environment during the rotation of the furnace body (1). Each end of the gas collection hood (27) is elastically damped and hinged with a door plate (28). The two door plates (28) can be pushed open one by one by the protrusion (22) on the furnace body (1) where the exhaust hole is located as the furnace body (1) rotates. When the through hole (25) is connected to the groove section of the strip groove (26) on the side of the filter plate (23), the protrusion (22) is moving in a circle with the furnace body (1) inside the gas collection hood (27).

2. The pyrolysis furnace for preparing rubber asphalt according to claim 1, characterized in that, Another coaxially fixed first gear (4) is fixed in the pyrolysis chamber. The first gear (4) meshes with a third gear (6) through a rotatably mounted second gear (5). The gear shaft (7) of the third gear (6) is coaxially and rotatably mounted at the end of the furnace body (1). An L-shaped scraper (2) is fixed at one end of the gear shaft (7) located in the pyrolysis chamber.

3. The pyrolysis furnace for preparing rubber asphalt according to claim 2, characterized in that, One end of the piston disc (3) is a flat surface, and the other end has a groove extending radially therein. The groove is for the vertical plate section of the scraper (2) to be submerged in. The horizontal section of the scraper (2) passes horizontally along the cylindrical surface of the piston disc (3), and the piston disc (3) can slide along the horizontal section in a direction parallel to the axial direction of the pyrolysis chamber.

4. The pyrolysis furnace for preparing rubber asphalt according to claim 1, characterized in that, The venting device includes a venting pipe (21) fixed at the end of the furnace body (1). A sliding rod (11) that slides only axially is connected inside the venting pipe (21) by a return spring (13) located at its end. One end of the sliding rod (11) is located inside the venting pipe (21) and a sliding pin (12) is elastically and telescopically installed on the side wall of that end. A pin (8) is coaxially located at the center of the end of the piston disc (3). The end of the pin (8) has a blind hole (9). The wall of the blind hole (9) has an annular slot (10). When the vent pipe (21) is connected to the vacuum device to vent, the piston disc (3) moves toward the vent pipe (21) and presses against the inner wall of the pyrolysis chamber. After the pin (8) is inserted into the vent pipe (21), its sliding pin (12) is engaged in the annular slot (10) and fixedly connected.

5. The pyrolysis furnace for preparing rubber asphalt according to claim 4, characterized in that, A limiting plate (14) is provided at the end of the vent pipe (21) away from the furnace body (1). The return spring (13) is sleeved on the slide rod (11) between the limiting plate (14) and the vent pipe (21). Several locking screws (15) are threaded on the limiting plate (14). When the locking screws (15) are screwed into the vent pipe (21) side, they can press tightly against the end face of the vent pipe (21), so that the slide rod (11) and the piston plate (3) generate an axial tension through the engagement of the sliding pin (12) and the annular slot (10).

6. The pyrolysis furnace for preparing rubber asphalt according to claim 5, characterized in that, An indicator rod (17) is fixed on the side of the limiting plate (14). When the indicator rod (17) corresponds to a set scale on a fixed scale (18), the tensioning effect is generated between the slide rod (11) and the piston plate (3).

7. The pyrolysis furnace for preparing rubber asphalt according to claim 6, characterized in that, The vacuuming device is connected to an annular cover (20) via a vacuum pipe. The annular cover (20) is coaxially covered outside the exhaust pipe (21) and dynamically sealed to the exhaust pipe (21). The exhaust pipe (21) has several air outlets (2101), all of which are located inside the annular cover (20).

8. The pyrolysis furnace for preparing rubber asphalt according to claim 1, characterized in that, A high-temperature resistant limiting spring is connected between the filter plate (23) and the sliding block (24). The limiting spring controls the axial sliding amount of the sliding block (24) in the exhaust hole when it rotates together with the furnace body (1).

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