Coal tar pitch melting device and method for laboratory

Abstract

The invention discloses a coal tar pitch melting device and method for a laboratory, and belongs to the technical field of coal tar pitch melting equipment.The coal tar pitch melting device comprises an experiment table, a supporting frame, a melting barrel, a cover plate, an exhaust pipe, a discharging opening, a heating mechanism and a stirring mechanism, the melting barrel and the supporting frame are arranged on the upper surface of the experiment table, and the melting barrel is located below the supporting frame; a matched cover plate is arranged on the melting barrel, the cover plate is connected to the lower end of the supporting frame in a liftable mode through a hydraulic cylinder, a stirring mechanism is further arranged on the lower surface of the cover plate to stir coal tar pitch in the melting barrel, an exhaust pipe is arranged on the upper surface of the cover plate, and a heating mechanism is arranged in the melting barrel to heat and melt the coal tar pitch in the melting barrel. One side of the lower end of the melting barrel is fixedly connected with a discharge port for discharging; the device is simple in structure, convenient to use and capable of effectively improving the heating uniformity during melting and accelerating melting.

Description

Technical Field

[0001] The present invention relates to an asphalt melting device, in particular to a coal tar pitch melting device and method for laboratory use, belonging to the technical field of coal tar pitch melting equipment. Background Art

[0002] Coal tar pitch is a by-product of coking, that is, the black substance remaining in the distillation kettle after tar distillation. It differs from refined tar only in physical properties, and there is no obvious boundary. The general classification method is to define tar as having a softening point below 26.7°C and asphalt as having a softening point above 26.7°C. Coal tar pitch mainly contains non-volatile anthracene, phenanthrene, pyrene, etc. These substances are toxic. Due to the different content of these components, the properties of coal tar pitch are also different. Temperature changes have a great influence on coal tar pitch, and it has a special smell when heated. After being heated to 260°C for 5 hours, the anthracene, phenanthrene, pyrene and other components it contains will evaporate.

[0003] At present, the coal tar pitch melting device used in the laboratory still has the following defects when in use: in the laboratory, alcohol lamps or other open flames are generally used for heating when melting coal tar pitch, which not only causes uneven heating but also slows down the melting efficiency of coal tar pitch.

[0004] The current patent CN215404028U is a laboratory coal tar pitch melting device, which is equipped with an electric heating plate, a drive motor and a moving cylinder. When melting coal tar pitch in the laboratory, the coal tar pitch is first placed in a heat-conducting container, and then the heating temperature of the electric heating plate is controlled by a temperature controller. At the same time, the drive motor is started, and the drive motor rotates the rectangular sleeve through the rotating rod, and the rectangular sleeve rotates the moving cylinder, and the moving cylinder causes the stirring rod to stir the coal tar pitch, so that the coal tar pitch is heated evenly, and the electric heating plate provides stable heating and good heating effect, which can accelerate the melting speed of the coal tar pitch. The mechanism improves the heating stability of the coal tar pitch through the electric heating plate, and at the same time enables the coal tar pitch melting device to have an automatic stirring function, thereby improving the convenience and efficiency of the laboratory melting coal tar pitch operation, and reducing the labor intensity of the staff. However, the melting device concentrates on heating and melting at the bottom, and the heating uniformity of the upper coal tar pitch needs to be improved. Moreover, the stirring mechanism can only stir and cannot be raised or lowered, and the stirring device cannot be inspected, repaired or replaced, which is inconvenient to use.

[0005] Therefore, developing a laboratory coal tar pitch melting device and method that can overcome the above defects has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a laboratory coal tar pitch melting device and method. The device has a simple structure and is easy to use. Using the device for melting can effectively improve the heat uniformity during melting and accelerate melting.

[0007] In order to solve the above technical problems, the present invention provides a coal tar pitch melting device for laboratory use, including a laboratory table, a support frame, a melting barrel, a cover plate, an exhaust pipe, a discharge port, a heating mechanism and a stirring mechanism. The upper surface of the laboratory table is provided with a melting barrel and a support frame, the melting barrel is located below the support frame, and a corresponding cover plate is provided on the melting barrel. The cover plate can be lifted and connected to the lower end of the support frame by a hydraulic cylinder. A stirring mechanism is also provided on the lower surface of the cover plate to stir the coal tar pitch in the melting barrel. An exhaust pipe is provided on the upper surface of the cover plate. A heating mechanism is built into the melting barrel to heat and melt the coal tar pitch in the melting barrel. A discharge port is fixedly connected to one side of the lower end of the melting barrel for discharging.

[0008] The technical solution further defined in the present invention is: Furthermore, in the aforementioned laboratory coal tar pitch melting device, a telescopic rod is provided on the lower surface of the support frame, and the output end of the telescopic rod is fixedly connected to the cover plate.

[0009] Technical effect: Since the components below the connecting frame are connected to the output end of the hydraulic cylinder through the connecting frame, in order to ensure the stability of subsequent use, a telescopic rod is added for limitation to prevent the connecting frame from rotating at the output end of the hydraulic cylinder 3 to improve stability.

[0010] In the aforementioned laboratory coal tar pitch melting device, the exhaust pipe is externally connected to an air purification device.

[0011] Technical effect: The present invention uses an exhaust pipe to transport the harmful gases generated not directly into the air but to an air purification device for purification, effectively reducing pollution to the environment and being more environmentally friendly.

[0012] In the aforementioned laboratory coal tar pitch melting device, the support frame is preferably an inverted U-shaped structure. The support frame provided in the present invention can not only support the cover plate for lifting and lowering, and effectively adjust it when working and not working, but also effectively maintain, repair or replace the stirring device inside, thereby extending its service life. The stirring device is also connected to ensure effective work and easy use.

[0013] In the aforementioned laboratory coal tar asphalt melting device, a connecting frame is provided on the cover plate, and the cover plate and the hydraulic cylinder are connected through the connecting frame. The connecting frame is an inverted U-shaped structure. The hydraulic cylinder is vertically arranged on the support frame. The output end of the hydraulic cylinder passes through the support frame and is connected to the connecting frame. The side of the connecting frame away from the hydraulic cylinder is connected to the cover plate (detachable). The hydraulic cylinder drives the cover plate up and down, and a sealing ring is provided at the edge of the lower surface of the cover plate.

[0014] Technical effect: The present invention adopts a connecting frame to connect the cover plate and the hydraulic cylinder, which is convenient for installation and disassembly between the cover plate and the hydraulic cylinder, easy to assemble, easy to replace and maintain, does not require overall replacement, extends service life and reduces costs.

[0015] In the aforementioned laboratory coal tar pitch melting device, the opening at the upper end of the melting barrel is concave downward to form a sealing groove that matches the sealing ring. The sealing ring is clamped in the sealing groove, and the hollow structure of the inner wall of the melting barrel forms a accommodating cavity. A heating mechanism is provided in the inner ring of the accommodating cavity.

[0016] Technical effect: The melting barrel of the present invention is provided with a sealing groove, which is compatible with the sealing ring on the cover plate, so as to facilitate better sealing and avoid the overflow of coal tar pitch or harmful gases generated during stirring and heating, which may affect the environment. A accommodating cavity is provided in the melting barrel, which is convenient for the installation of the heating device in the melting barrel without causing danger to the staff. The ring-shaped structure ensures the uniformity of heating and avoids the heating being concentrated only on the bottom and uneven heating.

[0017] In the aforementioned laboratory coal tar pitch melting device, the heating mechanism is a heating tube, and a plurality of heating tubes are fixed in the accommodating cavity at intervals from top to bottom.

[0018] Technical effect: heating tubes are provided on the inner wall of the accommodating cavity from bottom to bottom to ensure the uniformity of heating and ensure that the materials in the melting barrel can be heated.

[0019] In the aforementioned laboratory coal tar pitch melting device, the stirring mechanism includes a motor, a rotating shaft, a stirring frame and a stirring rod. The motor is vertically arranged on the upper surface of the cover plate. The output shaft of the motor passes through the cover plate and is connected to the rotating shaft that is rotatably connected to the lower surface of the cover plate. The stirring frame and the stirring rod are arranged on the rotating shaft. The stirring frame is a square structure, and the stirring rod is arranged vertically to the stirring frame.

[0020] Technical effect: The stirring mechanism in the present invention is driven by a motor to achieve stirring, stir the material in the melting barrel, improve the melting efficiency, and the stirring frame and the stirring rod are matched and arranged vertically between them, stirring on two sides, increasing the sufficiency of stirring, which is conducive to further improving the melting efficiency.

[0021] In the aforementioned laboratory coal tar asphalt melting device, a flow control mechanism is provided on the discharge port, and the flow control mechanism includes a bracket, a baffle and a threaded rod. A strip hole is opened on the upper surface of the discharge port, and a bracket is provided on the upper surface of the discharge port directly above the strip hole. There are slide grooves on both sides of the bracket, and the slide grooves are connected to the strip holes. A baffle is slidably connected in the slide groove, and the baffle is slidably connected to the discharge port through the strip hole. A threaded rod is threadedly connected to the bracket, and the bottom end of the threaded rod is rotatably set on the baffle. The top end of the threaded rod passes through the bracket and is connected to a fixed block.

[0022] Technical effect: The present invention sets a flow control mechanism at the discharge port, and the melted coal tar pitch is discharged through the gap between the baffle in the adjustable flow control mechanism and the discharge port. The experimenter can adjust the outflow flow of the coal tar pitch by controlling the rising height of the baffle, thereby accurately controlling the required amount of coal tar pitch and avoiding waste.

[0023] In the aforementioned laboratory coal tar pitch melting device, a T-shaped slot is provided at the upper end of the baffle corresponding to the position of the threaded rod, and the bottom end of the threaded rod is rotatably arranged in the T-shaped slot.

[0024] Technical effect: Since the threaded rod needs to drive the baffle to move up and the threaded rod needs to rotate, a T-slot connection is set at the connection between the baffle and the threaded rod to ensure that it does not interfere with the rotation of the threaded rod while driving the baffle to move upward synchronously.

[0025] The present invention also provides a laboratory coal tar pitch melting method, which specifically comprises the following steps: Step 1: Place solid coal tar pitch into the melting barrel, then activate the hydraulic cylinder. The hydraulic cylinder pushes the U-shaped connecting frame downward, which in turn drives the cover plate downward. The cover plate simultaneously pulls the telescopic rod. When the sealing ring at the bottom of the cover plate engages with the sealing groove, the melting barrel is sealed. Then, one end of the exhaust pipe is connected to the air purification device. Step 2: Turn on the heating tubes. Several groups of heating tubes are turned on to heat the interior of the melting barrel. The solid coal tar pitch in the melting barrel is melted by the gradual heating of the heating tubes. At the same time, the motor is turned on. The motor drives the rotating shaft on the cover to rotate. The rotating shaft drives the stirring rod and the stirring frame to rotate to stir the coal tar pitch in the melting barrel. Step three: The gas generated during the melting process of coal tar pitch is transported through the exhaust pipe to the air purification device for purification and then discharged. After the coal tar pitch is melted, the threaded rod is twisted to rotate on the baffle. The threaded rod is connected to the bracket through a thread, driving the baffle to slide upward on the slide groove and the discharge port. The melted coal tar pitch is discharged through the gap between the baffle and the discharge port. By controlling the rising height of the baffle, the flow rate of the coal tar pitch can be controlled, which makes it convenient for the experimenter to take out the coal tar pitch according to the needs of the experiment.

[0026] The beneficial effects of the present invention are: The present invention ensures that the coal tar pitch is evenly heated during the melting process by distributing several groups of heating tubes in a circular manner from top to bottom on the melting barrel. At the same time, the stirring rod driven by the motor rotates in the melting barrel, so that the coal tar pitch is constantly in contact with the inner wall of the melting barrel. This not only accelerates the melting speed of the coal tar pitch, but also significantly improves the uniformity of melting, effectively avoids the problems of local overheating or uneven melting, and ensures the quality of the coal tar pitch required for the experiment.

[0027] During the melting process of coal tar pitch in the present invention, the harmful gases generated are transported to the air purification device through the exhaust pipe for purification treatment, which effectively reduces pollution to the environment. In addition, the melted coal tar pitch is discharged through the gap between the adjustable baffle and the discharge port. The experimenter can adjust the outflow flow rate of the coal tar pitch by controlling the rising height of the baffle, thereby accurately controlling the required amount of coal tar pitch and avoiding waste.

[0028] The stirring mechanism of the present invention can be raised and lowered on the support frame under the action of the hydraulic cylinder, which is convenient for inspection, maintenance and replacement of the stirring mechanism and is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The structure of the coal tar pitch melting device for laboratory use in the embodiment of the present invention is shown as follows: Figure 1 ; Figure 2 The structure of the coal tar pitch melting device for laboratory use in the embodiment of the present invention is shown as follows: Figure 2 ; Figure 3 for Figure 1 sectional view of Figure 4 for Figure 2 Enlarged view of part A; In the figure: 1-laboratory table, 2-support frame, 3-hydraulic cylinder, 4-connecting frame, 5-cover plate; 6-exhaust pipe, 7-telescopic rod, 8-sealing ring, 9-motor, 10-rotating shaft, 11-stirring rod, 12-support leg, 13-melting barrel, 14-sealing groove, 15-heating tube, 16-discharge port, 17-bracket, 18-chute, 19-baffle, 20-threaded rod, 21-stirring frame. DETAILED DESCRIPTION

[0030] The present invention will be described clearly and completely below with reference to specific embodiments. It should be understood that the embodiments described are merely some, and not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention. Example 1

[0031] See Figure 1, a laboratory coal tar pitch melting device provided in this embodiment includes a laboratory table 1, a support frame 2, a melting barrel 13, a cover plate 5, an exhaust pipe 6, a discharge port 16, a heating pipe 15 and a stirring mechanism. The upper surface of the laboratory table 1 is provided with a melting barrel 13 and a support frame 2, the melting barrel 13 is located below the support frame 2, and a matching cover plate 5 is provided on the melting barrel 13. The cover plate 5 can be lifted and connected to the lower end of the support frame 2 through a hydraulic cylinder 3. A telescopic rod 7 is further provided on the lower surface of the support frame 2, and the output end of the telescopic rod 7 is fixedly connected to the cover plate 5. A stirring mechanism is further provided on the lower surface of the cover plate 5 to stir the coal tar pitch in the melting barrel 13, an exhaust pipe 6 is provided on the upper surface of the cover plate 5, and the exhaust pipe 6 is externally connected to an air purification device, a heating pipe 15 is built into the melting barrel 13 to heat and melt the coal tar pitch in the melting barrel 13, and a discharge port 16 is fixedly connected to one side of the lower end of the melting barrel 13 for discharging; See Figure 1-3 , a connecting frame 4 is provided on the cover plate 5, and the cover plate 5 and the hydraulic cylinder 3 are connected through the connecting frame 4. The connecting frame 4 is an inverted U-shaped structure. The hydraulic cylinder 3 is vertically arranged on the support frame 2. The output end of the hydraulic cylinder 3 passes through the support frame 2 and is connected to the connecting frame 4. The side of the connecting frame 4 away from the hydraulic cylinder 3 is connected to the cover plate 5. The hydraulic cylinder 3 drives the cover plate 5 to move up and down. A sealing ring 8 is provided on the edge of the lower surface of the cover plate 5; See Figure 1-3 The stirring mechanism includes a motor 9, a rotating shaft 10, a stirring frame 21 and a stirring rod 11. The motor 9 is vertically arranged on the upper surface of the cover plate 5. The output shaft of the motor 9 passes through the cover plate 5 and is connected to the rotating shaft 10 which is rotatably connected to the lower surface of the cover plate 5. The stirring frame 21 and the stirring rod 11 are fixedly sleeved on the rotating shaft 10. The stirring frame 21 is a square structure, and the stirring rod 11 is vertically arranged on the stirring frame 21. See Figure 3 , the experimental table 1 is fixedly connected to a supporting leg 12, and a melting barrel 13 is fixedly connected to the supporting leg 12. The opening at the upper end of the melting barrel 13 is concave downward to form a sealing groove 14 that is compatible with the sealing ring 8. The sealing ring 8 is clamped in the sealing groove 14. The hollow structure of the inner wall of the melting barrel 13 forms an accommodating chamber, and a plurality of heating tubes 15 are fixed around the accommodating chamber from top to bottom; the annular distribution of several groups of heating tubes 15 on the melting barrel 13 ensures that the coal tar pitch can be evenly heated during the melting process. At the same time, the stirring rod 11 driven by the motor 9 rotates in the melting barrel 13, so that the coal tar pitch is constantly in contact with the inner wall of the melting barrel 13, which not only accelerates the melting speed of the coal tar pitch, but also significantly improves the uniformity of melting, effectively avoids the problem of local overheating or uneven melting, and ensures the quality of the coal tar pitch required for the experiment; See Figure 4A discharge port 16 is fixedly connected to one side of the melting barrel 13, and a flow control mechanism is provided on the discharge port 16. The flow control mechanism includes a bracket 17, a baffle 19 and a threaded rod 20. A strip hole is opened on the upper surface of the discharge port 16, and a bracket 17 is provided on the upper surface of the discharge port 16 directly above the strip hole. A slide groove 18 is provided on both sides of the bracket 17, and the slide groove 18 is connected to the strip hole. A baffle 19 is slidably connected in the slide groove 18, and the baffle 19 is slidably connected to the discharge port 16 through the strip hole. A threaded rod 20 is threadedly connected to the bracket 17, and the bottom end of the threaded rod 20 is rotatably set in the T-slot opened at the upper end of the baffle 19, and the top of the threaded rod 20 passes through the bracket 17 and is connected to a fixed block.

[0032] In this embodiment, one end of the exhaust pipe 6 passes through the cover plate 5, the upper end of the rotating shaft 10 passes through the cover plate 5 and is connected to the output end of the motor, the output end of the hydraulic cylinder 3 passes through the support frame 2, the shape of the support frame 2 is an inverted U shape, the discharge port 16 passes through the melting barrel 13, the baffle 19 passes through the upper end of the discharge port 16, and there are several groups of heating pipes 15. The heating pipes 15 are arranged in the cavity of the melting barrel 13. During the melting process of coal tar pitch, the harmful gases generated are transported to the air purification device through the exhaust pipe 6 for purification, which effectively reduces the pollution to the environment. In addition, the melted coal tar pitch is discharged through the gap between the adjustable baffle 19 and the discharge port 16. The experimenter can adjust the outflow flow of the coal tar pitch by controlling the rising height of the baffle 19, thereby accurately controlling the required amount of coal tar pitch and avoiding waste.

[0033] During specific implementation, the melting method comprises the following steps: (1) Solid coal tar pitch is placed into the melting barrel 13, and then the hydraulic cylinder 3 is turned on. The hydraulic cylinder 3 pushes the U-shaped connecting frame 4 downward, and the connecting frame 4 drives the cover plate 5 downward. The cover plate 5 simultaneously pulls the telescopic rod 7. When the sealing ring 8 at the bottom of the cover plate 5 is engaged with the sealing groove 14, the melting barrel 13 is closed. Then, one end of the exhaust pipe 6 is connected to the air purification device. (2) Turn on the heating tubes 15. The opening of several groups of heating tubes 15 heats the inside of the melting barrel 13. When the solid coal tar pitch in the melting barrel 13 is melted by the gradual heating of the heating tubes 15, the motor 9 is turned on. The motor 9 drives the rotating shaft 10 to rotate on the cover plate 5. The rotating shaft 10 drives several groups of stirring rods 11 and the stirring frame 21 to rotate to stir the coal tar pitch in the melting barrel 13. The several groups of heating tubes 15 are distributed in an annular manner on the melting barrel 13, so that the coal tar pitch in the melting barrel 13 is heated evenly. At the same time, the rotation of the several groups of stirring rods 11 makes the coal tar pitch in the melting barrel 13 reciprocate and contact the inner wall of the melting barrel 13, thereby accelerating the melting efficiency of the coal tar pitch and improving the melting uniformity of the coal tar pitch. (3) The gas generated during the melting process of coal tar pitch is transported through the exhaust pipe 6 to the air purification device for purification and then discharged. After the coal tar pitch is melted, the threaded rod 20 is screwed to rotate on the baffle 19. The threaded rod 20 is connected to the bracket 17 through a thread and drives the baffle 19 to slide upward on the slide 18 and the discharge port 16. The melted coal tar pitch is discharged through the gap formed by the baffle 19 and the discharge port 16. The flow rate of the coal tar pitch can be controlled by controlling the rising height of the baffle 19, so that the experimenter can take out the coal tar pitch according to the experimental needs and avoid waste.

[0034] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present invention.

Claims

1. A laboratory coal tar pitch melting device, characterized by: The invention comprises a test bench (1), a support frame (2), a melting barrel (13), a cover plate (5), an exhaust pipe (6), a discharge port (16), a heating mechanism and a stirring mechanism. The upper surface of the test bench (1) is provided with the melting barrel (13) and the support frame (2). The melting barrel (13) is located below the support frame (2). The melting barrel (13) is provided with a corresponding cover plate (5). The cover plate (5) can be lifted and lowered to the lower end of the support frame (2) through a hydraulic cylinder (3). The lower surface of the cover plate (5) is also provided with the stirring mechanism for stirring the coal tar pitch in the melting barrel (13). The upper surface of the cover plate (5) is provided with the exhaust pipe (6). The melting barrel (13) is provided with the heating mechanism for heating and melting the coal tar pitch in the melting barrel (13). One side of the lower end of the melting barrel (13) is fixedly connected with the discharge port (16) for discharging.

2. The laboratory coal tar pitch melting device according to claim 1, characterized in that: A telescopic rod (7) is further provided on the lower surface of the support frame (2), and the output end of the telescopic rod (7) is fixedly connected to the cover plate (5).

3. The laboratory coal tar pitch melting device according to claim 1, characterized in that: The exhaust pipe (6) is externally connected to an air purification device.

4. The laboratory coal tar pitch melting device according to claim 1, characterized in that: A connecting frame (4) is provided on the cover plate (5), and the cover plate (5) and the hydraulic cylinder (3) are connected via the connecting frame (4). The connecting frame (4) is an inverted U-shaped structure. The hydraulic cylinder (3) is vertically arranged on the support frame (2). The output end of the hydraulic cylinder (3) passes through the support frame (2) and is connected to the connecting frame (4). The side of the connecting frame (4) away from the hydraulic cylinder (3) is connected to the cover plate (5). The hydraulic cylinder (3) drives the cover plate (5) to move up and down. A sealing ring (8) is provided at the edge of the lower surface of the cover plate (5).

5. The laboratory coal tar pitch melting device according to claim 4, characterized in that: The opening at the upper end of the melting barrel (13) is concave downward to form a sealing groove (14) adapted to the sealing ring (8), the sealing ring (8) is clamped in the sealing groove (14), and the hollow structure of the inner wall of the melting barrel (13) forms an accommodating cavity, and the heating mechanism is arranged in the inner ring of the accommodating cavity.

6. The laboratory coal tar pitch melting device according to claim 5, characterized in that: The heating mechanism is a heating tube (15), and a plurality of heating tubes (15) are fixed in the accommodating cavity from top to bottom in an interval.

7. The laboratory coal tar pitch melting device according to claim 1, characterized in that: The stirring mechanism comprises a motor (9), a rotating shaft (10), a stirring frame (21) and a stirring rod (11); the motor (9) is vertically arranged on the upper surface of the cover plate (5); the output shaft of the motor (9) passes through the cover plate (5) and is connected to the rotating shaft (10) rotatably connected to the lower surface of the cover plate (5); the stirring frame (21) and the stirring rod (11) are arranged on the rotating shaft (10); the stirring frame (21) is a square structure, and the stirring rod (11) and the stirring frame (21) are arranged vertically.

8. The laboratory coal tar pitch melting device according to claim 1, characterized in that: The discharge port (16) is provided with a flow control mechanism, which includes a bracket (17), a baffle (19) and a threaded rod (20). A strip hole is opened on the upper surface of the discharge port (16). The upper surface of the discharge port (16) is provided with the bracket (17) directly above the strip hole. Slide grooves (18) are provided on both sides of the bracket (17). The slide grooves (18) are connected to the strip hole. The baffle (19) is slidably connected in the slide groove (18). The baffle (19) is slidably connected to the discharge port (16) through the strip hole. The threaded rod (20) is threadedly connected to the bracket (17). The bottom end of the threaded rod (20) is rotatably set on the baffle (19). The top end of the threaded rod (20) passes through the bracket (17) and is connected to a fixed block.

9. The laboratory coal tar pitch melting device according to claim 8, characterized in that: A T-shaped slot is provided at the upper end of the baffle (19) corresponding to the position of the threaded rod (20), and the bottom end of the threaded rod (20) is rotatably arranged in the T-shaped slot.

10. A method for melting using the apparatus according to any one of claims 1 to 9, characterized in that: The specific steps include: Step 1: Put solid coal tar pitch into the melting barrel (13), then open the hydraulic cylinder (3), the hydraulic cylinder (3) pushes the U-shaped connecting frame (4) to move downward, the connecting frame (4) drives the cover plate (5) to move downward, and the cover plate (5) simultaneously pulls the telescopic rod (7), and the sealing ring (8) at the bottom of the cover plate (5) is connected to the sealing groove (14) to complete the sealing of the melting barrel (13), and then connect one end of the exhaust pipe (6) to the air purification device; Step 2: Turn on the heating tubes (15). The heating tubes (15) are turned on to heat the interior of the melting barrel (13). The solid coal tar pitch in the melting barrel (13) is melted by the gradual heating of the heating tubes (15). At the same time, the motor (9) is turned on. The motor (9) drives the rotating shaft (10) to rotate on the cover plate (5). The rotating shaft (10) drives the stirring rod (11) and the stirring frame (21) to rotate to stir the coal tar pitch in the melting barrel (13). Step 3: The gas generated during the melting process of the coal tar pitch is transported through the exhaust pipe (6) to the air purification device for purification and then discharged. After the coal tar pitch is melted, the threaded rod (20) is screwed to rotate on the baffle (19). The threaded rod (20) is connected to the bracket (17) by a thread, driving the baffle (19) to slide upward on the slide (18) and the discharge port (16). The melted coal tar pitch is discharged through the gap formed by the baffle (19) and the discharge port (16). By controlling the height of the baffle (19), the flow rate of the coal tar pitch can be controlled, so that the experimenter can take out the coal tar pitch according to the experimental needs.

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