High-efficiency continuous rosin melting device and melting method thereof

Abstract

The invention discloses an efficient continuous rosin melting device and a melting method thereof, and relates to the technical field of rosin dissolving equipment, the efficient continuous rosin melting device comprises a continuous melting pot, a steam pipe with a steam valve and a pressure gauge is arranged on the lower portion of the continuous melting pot, and the steam outlet end of the steam pipe is communicated with a steam coil arranged on the lower portion in the continuous melting pot; the bottom of the continuous melting pot is provided with a slag discharge port with a slag discharge valve, the side wall of the continuous melting pot is connected with a melting oil pipe with a reflux valve, the upper end of the melting oil pipe is communicated with the upper part of the continuous melting pot, and the lower end of the melting oil pipe extends into the continuous melting pot and is positioned between the steam coil and the slag discharge port; compared with the prior art, rosin sinking at the bottom of a pot can be fully contacted and melted with melted oil, efficient continuous melting of the rosin is realized, and the problems of incomplete melting and high-temperature caking of a large number of rosin particles sinking at the bottom of the pot during continuous melting of the rosin in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of rosin dissolving equipment, in particular to a high-efficiency continuous melting device for rosin and a melting method thereof. Background Art

[0002] In the process of rosin production, the main processes include melting process, filtration process, drainage process, clarification process and distillation process. Among them, in the melting process, a certain proportion of rosin, solvent and oxalic acid aqueous solution are added to the melting pot, and steam is directly introduced to heat and tumble the materials, so that the rosin and the solvent are fully melted. The solvent used in the melting process is the middle oil of turpentine obtained in the distillation process, and the purpose of adding oxalic acid is to remove iron in the rosin. The distillation process is to distill the fat liquid with a distillation pot to obtain rosin and turpentine.

[0003] In the current rosin production industry, the technologies used in the rosin melting process mainly include batch melting technology and continuous melting technology.

[0004] The continuous melting technology is a process in which the three steps of feeding, melting and discharging are carried out continuously at the same time.

[0005] The continuous melting technology process is described as follows, see Figure 1 : (1) Before starting the machine, confirm that all valves are in the closed state and all instruments and equipment are operating normally.

[0006] (2) First, open the oxalic acid water valve F103 to inject sufficient oxalic acid water into the continuous melting pot 101. After water overflows from the discharge pipe, close the oxalic acid water valve F103.

[0007] (3) Open the steam valve F104 to introduce steam into the continuous melting pot 101 for heating, and heat the oxalic acid water in the pot to 90 °C.

[0008] (4) When the thermometer T102 shows that the temperature reaches 90 °C, open the rosin valve F101; start the rosin conveyor 202, control the rotation speed of the conveyor motor, so that the feeding speed reaches the required amount; open the melting oil valve F102, control the valve opening, so that the flow rate of the melting oil reaches the required amount; open the oxalic acid water valve F103, control the valve opening, so that the flow rate of the oxalic acid water reaches the required amount.

[0009] (5) Control the opening of the steam valve F104 so that the temperature shown by the thermometer T102 remains between 92 and 97 °C.

[0010] (6) After observing that materials flow out from the discharge pipe, the device starts to operate stably.

[0011] (7) Calculate the sand discharge cycle according to the sand content in the rosin, and perform the sand discharge operation regularly. First, slowly open the slag discharge valve F106, and observe whether there are rosin particles in the drained water. If there are rosin particles, close the slag discharge valve F106. First, open the standby steam valve F105 to spray the pot, so that the rosin particles sinking at the bottom of the pot roll, heat and melt; the spraying time of the pot lasts for 3 - 5 minutes, then close the standby steam valve F105, and slowly open the slag discharge valve F106 again, and observe whether there are rosin particles in the drained water. If there are still rosin particles, close the slag discharge valve F106 and perform the pot spraying operation again until there are no rosin particles in the drained water. Pay attention to the sand content in the drained water during slag discharge, and close the slag discharge valve F106 after the sand and gravel are drained out.

[0012] The above continuous melting technology has the following problems: During the continuous melting process, since the density of the rosin liquid is lower than that of water, the rosin liquid and water are likely to form a layer in the melting pot; the density of the particles in the rosin is greater than that of water, and the particles sink to the bottom of the melting pot without being completely melted after entering the melting pot. Since the melting oil has a density less than that of water, it is difficult to reach the bottom of the pot. Therefore, the bottom of the pot becomes a dead corner of the melting pot; when using the standby steam to spray the pot, due to the absence of a solvent, the melting effect on the rosin particles is not good. After a large amount of rosin particles accumulate at the bottom of the pot, they agglomerate under the action of high temperature and block the slag discharge valve. Summary of the Invention

[0013] One of the purposes of the present invention is to provide an efficient continuous melting device for rosin, which can solve the problems of poor melting effect and easy agglomeration of the rosin particles sinking to the bottom of the existing continuous rosin melting pot.

[0014] To solve the above problems, the technical solution adopted by the present invention is: it includes a continuous melting pot. A steam pipe with a steam valve and a pressure gauge is provided at the lower part of the continuous melting pot. The outlet end of the steam pipe is communicated with a live steam coil arranged at the lower part inside the continuous melting pot. A slag discharge port with a slag discharge valve is provided at the bottom of the continuous melting pot. A melting oil pipe with a reflux valve is connected to the side wall of the continuous melting pot. The upper end of the melting oil pipe is communicated with the upper part of the continuous melting pot, and the lower end of the melting oil pipe extends into the continuous melting pot at a position between the live steam coil and the slag discharge port.

[0015] In the technical solution of the above-mentioned high-efficiency continuous rosin melting device, a more specific technical solution may further be: there are two continuous melting pots, namely a front continuous melting pot and a rear continuous melting pot. The front continuous melting pot is connected to a rosin transition tank through a pipeline. A rosin conveyor is provided between the front continuous melting pot and the pipeline. The pipeline is also respectively connected to an oil pipe with a melting oil valve and a flow meter and a water pipe with an oxalic acid water valve and a flow meter. The front continuous melting pot and the rear continuous melting pot are communicated through a connecting pipe; a discharge pipe with a valve is provided on the upper part of the rear continuous melting pot, and the discharge pipe is connected to a filtering device; a cleaning pipe with a cleaning valve is installed on the lower side of the discharge pipe orifice of the rear continuous melting pot; the input end of the melting oil pipe is connected to a pipeline pump.

[0016] In some possible implementation schemes, the upper end of the melting oil pipe communicates with the upper part of the front continuous melting pot, and the lower end thereof is connected to a branch pipe with reflux valves at both ends. Both ends of the branch pipe respectively extend into positions between the live steam coil and the slag discharge port in the front continuous melting pot and positions between the live steam coil and the slag discharge port in the rear continuous melting pot.

[0017] In some possible implementation schemes, the upper end of the melting oil pipe communicates with the upper part of the rear continuous melting pot, and the lower end thereof is connected to a branch pipe with reflux valves at both ends. Both ends of the branch pipe respectively extend into positions between the live steam coil and the slag discharge port in the front continuous melting pot and positions between the live steam coil and the slag discharge port in the rear continuous melting pot.

[0018] In some possible implementation schemes, the orifice of the connecting pipe extending into the rear continuous melting pot extends to the middle and lower part of the rear continuous melting pot.

[0019] In some possible implementation schemes, there are two melting oil pipes. The upper end of one melting oil pipe communicates with the upper part of the front continuous melting pot, and the lower end of this melting oil pipe extends into the position between the live steam coil and the slag discharge port in the front continuous melting pot; the upper end of the other melting oil pipe communicates with the upper part of the rear continuous melting pot, and the lower end of this melting oil pipe extends into the position between the live steam coil and the slag discharge port in the rear continuous melting pot. Each melting oil pipe is equipped with a pipeline pump.

[0020] The second object of the present invention is to provide a high-efficiency continuous rosin melting method, and the melting steps are as follows: ① Before starting the machine, confirm that all valves are in the closed state and all instruments and equipment are operating normally; ② Inject sufficient oxalic acid water into the front continuous melting pot and the rear continuous melting pot. After water overflows from the opened cleaning pipe, stop adding oxalic acid water; ③ Feed steam into the front continuous melting pot and the rear continuous melting pot for heating, and heat the oxalic acid water in the pot to the set temperature; ④ After the temperatures of the two continuous melting pots reach the set temperature, start the rosin conveyor, control the rotation speed of the conveyor motor to make the feeding speed reach the required amount; open the melting oil valve, control the valve opening to make the flow rate of the melting oil reach the required amount; open the oxalic acid water valve, control the valve opening to make the flow rate of the oxalic acid water reach the required amount; ⑤ Control the opening of the steam valves of the front continuous melting pot and the rear continuous melting pot to keep the temperatures of the front continuous melting pot and the rear continuous melting pot within the set temperature range; ⑥ After observing that there is material flowing out of the discharge pipe, open the reflux valves at both ends of the melting oil pipe, start the pipeline pump, and supply melting oil to the bottom of the continuous melting pot, and the device starts to operate stably; ⑦ Calculate the sand discharge cycle according to the sand content in the rosin, perform sand discharge operation regularly, observe the sand content in the drained water, close the slag discharge valve after the sand is completely discharged, and close the reflux valve.

[0021] In some possible implementation schemes, the set temperature in step ③ and step ④ is 90 °C; in step ⑤, the set temperature range is between 85 °C and 97 °C.

[0022] In some possible implementation schemes, in step ⑤, the temperature of the front continuous melting pot is kept between 85 and 90 °C, and the temperature of the rear continuous melting pot is kept between 92 and 97 °C; in step ⑥, open the reflux valve at the upper end of the melting oil pipe and the reflux valve at the end of the branch pipe connected to the front continuous melting pot, start the pipeline pump, and supply melting oil to the bottom of the front continuous melting pot; in step ⑦, when performing sand discharge regularly, open the reflux valve at the end of the branch pipe connected to the rear continuous melting pot, close the reflux valve of the branch pipe opened in step ⑥, open the slag discharge valve of the front continuous melting pot after the bottom of the pot is supplied with oil to discharge slag, observe the sand content in the drained water, close the slag discharge valve after the sand is completely discharged, open the reflux valve at the end of the branch pipe connected to the front continuous melting pot for the second time, close the reflux valve at the end of the branch pipe connected to the rear continuous melting pot, open the slag discharge valve of the rear continuous melting pot to discharge slag, observe the sand content in the drained water, and close the slag discharge valve after the sand is completely discharged.

[0023] In some possible implementation schemes, thermometers are respectively installed on the bodies of the front continuous melting pot and the rear continuous melting pot.

[0024] Due to the adoption of the above technical solutions, the present invention has the following beneficial effects compared with the prior art: 1. Since the side wall of the continuous melting pan is connected with a melting oil pipe with a reflux valve, the upper end of the melting oil pipe communicates with the upper part of the continuous melting pan, and the lower end of the melting oil pipe extends into the continuous melting pan at a position between the live steam coil and the slag discharge port. The melting oil pipe can introduce the melting oil into the bottom of the continuous melting pan, so that the rosin deposited at the bottom of the pan can continue to contact and dissolve with the melting oil, realizing the efficient and continuous melting of rosin, and solving the problems that a large amount of rosin particles deposited at the bottom of the pan are incompletely melted and caked at high temperature in the previous continuous melting of rosin.

[0025] 2. This device can be improved on the existing continuous melting pan. After the device is debugged, it can operate continuously, stably and efficiently, and only needs to discharge sand and stone impurities regularly.

[0026] 3. This melting method injects the melting oil extracted from the upper part of the continuous melting pan into the bottom of the pan, so that the rosin deposited at the bottom of the pan can fully contact and dissolve with the melting oil, realizing the efficient and continuous melting of rosin, and leaving no dead corners in the pan. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the prior art.

[0028] Figure 2 is a schematic structural diagram of the first embodiment of the present invention.

[0029] Figure 3 is a schematic structural diagram of the second embodiment of the present invention.

[0030] Figure 4 is a schematic structural diagram of the third embodiment of the present invention.

[0031] Figure 5 is a schematic structural diagram of the fourth embodiment of the present invention.

[0032] Description of the marks in the figure: Front continuous melting pan 1, rear continuous melting pan 2, steam pipe 3, live steam coil 4, slag discharge port 5, steam pipe 6, live steam coil 7, slag discharge port 8, pipe 9, rosin transition tank 10, rosin conveyor 11, oil pipe 12, water pipe 13, connecting pipe 14, discharge pipe 15, cleaning pipe 16, melting oil pipe 17, branch pipe 18, continuous dissolving pan 19, live steam coil 20, slag discharge port 21, front melting oil pipe 22, rear melting oil pipe 23, pipeline pump 24, live steam coil 25, pipeline pump 26. DETAILED DESCRIPTION OF THE INVENTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more easily interpretable, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0034] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "fixation" and the like shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Such as Figure 2Embodiment 1 shown. The high-efficiency continuous rosin melting device of this Embodiment 1 includes two continuous melting pots, namely the front continuous melting pot 1 and the rear continuous melting pot 2. A steam pipe 3 with a steam valve F4 and a pressure gauge P1 is provided at the lower part of the front continuous melting pot 1. The outlet end of this steam pipe is connected to a live steam coil 4 provided at the lower part inside the front continuous melting pot 1. A slag discharge port 5 with a slag discharge valve F5 is provided at the bottom of the front continuous melting pot 1. A steam pipe 6 with a steam valve F11 and a pressure gauge P2 is provided at the lower part of the rear continuous melting pot 2. The outlet end of this steam pipe is connected to a live steam coil 7 provided at the lower part inside the rear continuous melting pot 2. A slag discharge port 8 with a slag discharge valve F9 is provided at the bottom of the rear continuous melting pot 2. The front continuous melting pot 1 is connected to a rosin transition tank 10 through a pipeline 9. A rosin conveyor 11 is provided between this front continuous melting pot and the pipeline 9. This pipeline is also respectively connected to an oil pipe 12 with a melting oil valve F2 and a flow meter L1 and a water pipe 13 with an oxalic acid water valve F3 and a flow meter L2. The front continuous melting pot 1 and the rear continuous melting pot 2 are connected through a connecting pipe 14. The end of the connecting pipe 14 extending into the rear continuous melting pot 2 extends to the middle and lower part of the rear continuous melting pot 2; A discharge pipe 15 with a valve is provided at the upper part of the rear continuous melting pot 2. This discharge pipe is connected to a filtering device; A cleaning pipe 16 with a cleaning valve F10 is installed on the lower side of the discharge pipe orifice of this rear continuous melting pot; The melting oil pipe 17 has its upper end connected to the upper part of the rear continuous melting pot 2, and its lower end is connected to a branch pipe 18 with reflux valves at both ends. The two ends of this branch pipe respectively extend into the positions between the live steam coil 4 and the slag discharge port 5 inside the front continuous melting pot 1 and the positions between the live steam coil 7 and the slag discharge port 8 inside the rear continuous melting pot 2. A reflux valve F6 is installed at the end of the branch pipe 18 connected to the front continuous melting pot 1, and a reflux valve F7 is installed at the end connected to the rear continuous melting pot 2. A reflux valve F8 and a pipeline pump 24 are installed at the input end of the melting oil pipe 17. Thermometers T2 and T4 are respectively installed on the pot bodies of the front continuous melting pot 1 and the rear continuous melting pot 2.

[0036] In this embodiment, the melting steps are as follows: ① Before starting the machine, confirm that all valves are in the closed state and all instruments and equipment are operating normally; ② First, open the oxalic acid water valve F3, inject sufficient oxalic acid water into the front continuous melting pot. The oxalic acid water enters the rear continuous melting pot 3 through the connecting pipe 14. At the same time, open the cleaning valve F10. After the water overflows from the cleaning pipe 16, close the oxalic acid water valve F3 and the cleaning valve F10; ③ Open the steam valve F4 and the steam valve F11, and introduce steam into the front continuous melting pot 1 and the rear continuous melting pot 2 for heating, and heat the oxalic acid water in the pot to 90 °C; ④ Wait until the thermometers T2 of the front continuous melting pan 1 and T4 of the rear continuous melting pan 2 show that the temperature reaches 90 °C, then open the rosin valve F1; start the rosin conveyor 11, control the rotation speed of the conveyor motor to make the feeding speed reach the required amount; open the melting oil valve F2, control the valve opening to make the flow rate of the melting oil reach the required amount; open the oxalic acid water valve F3, control the valve opening to make the flow rate of the oxalic acid water reach the required amount. ⑤ Control the opening degrees of the steam valve F4 and the steam valve F11 to keep the temperature shown by the thermometer T2 of the front continuous melting pan 1 between 85 and 90 °C, and keep the temperature shown by the thermometer T4 of the rear continuous melting pan 2 between 92 and 97 °C. ⑥ After observing that there is material flowing out of the discharge pipe 15, open the reflux valve F6 and the reflux valve F8, start the pipeline pump 24, supply melting oil to the bottom of the front continuous melting pan 1, and the device starts to operate stably. ⑦ Calculate the sand discharge period according to the sand content in the rosin, and perform the sand discharge operation regularly; first open the reflux valve F7, supply melting oil to the bottom of the rear continuous melting pan 2, close the reflux valve F6, slowly open the slag discharge valve F5, observe the sand content in the drained water, close the slag discharge valve F5 after the sand is completely discharged, open the reflux valve F6, continue to supply melting oil to the bottom of the front continuous melting pan, close the reflux valve F7, open the slag discharge valve F9, observe the sand content in the drained water, and close the slag discharge valve F9 after the sand is completely discharged.

[0037] As Figure 3 shown in Embodiment 2, different from Embodiment 1, the upper end of the melting oil pipe 17 in the high-efficiency continuous rosin melting device of this Embodiment 2 is connected to the upper part of the front continuous melting pan 1, and other structures are the same as those in Embodiment 1.

[0038] In this embodiment, the melting steps are as follows: ① Before starting up, confirm that all valves are in the closed state and all instruments and equipment are operating normally. ② First open the oxalic acid water valve F3, inject sufficient oxalic acid water into the front continuous melting pan. The oxalic acid water enters the rear continuous melting pan 3 through the connecting pipe 14. At the same time, open the cleaning valve F10. After the water overflows from the cleaning pipe 16, close the oxalic acid water valve F3 and the cleaning valve F10. ③ Open the steam valves F4 and F11, and introduce steam into the front continuous melting pan 1 and the rear continuous melting pan 2 for heating, and heat the oxalic acid water in the pans to 90 °C. ④ Wait until the thermometers T2 of the front continuous melting pot 1 and T4 of the rear continuous melting pot 2 show that the temperature reaches 90 °C, then open the rosin valve F1; start the rosin conveyor 11, control the rotation speed of the conveyor motor to make the feeding speed reach the required amount; open the melting oil valve F2, control the valve opening to make the flow rate of the melting oil reach the required amount; open the oxalic acid water valve F3, control the valve opening to make the flow rate of the oxalic acid water reach the required amount. ⑤ Control the opening degrees of the steam valve F4 and the steam valve F11 to keep the temperature shown by the thermometer T2 of the front continuous melting pot 1 between 85 and 90 °C, and keep the temperature shown by the thermometer T4 of the rear continuous melting pot 2 between 92 and 97 °C. ⑥ After observing that there is material flowing out of the discharge pipe 15, open the reflux valves F6 and F8, supply melting oil to the bottom of the front continuous melting pot 1, start the pipeline pump 24, and the device starts to operate stably. ⑦ Calculate the sand discharge cycle according to the sand content in the rosin, and perform the sand discharge operation regularly; first open the reflux valve F7, supply melting oil to the bottom of the rear continuous melting pot 2, close the reflux valve F6, slowly open the slag discharge valve F5, observe the sand content in the drained water, close the slag discharge valve F5 after the sand is completely discharged, open the reflux valve F6, close the reflux valve F7, open the slag discharge valve F9, observe the sand content in the drained water, and close the slag discharge valve F9 after the sand is completely discharged.

[0039] As Figure 4 Shown in the third embodiment, different from the second embodiment, this embodiment only requires one continuous dissolving pot 19. The side wall of the continuous melting pot 19 is connected with a melting oil pipe 20 with reflux valves at both the upper and lower ends. The upper end of the melting oil pipe communicates with the upper part of the continuous melting pot 19, and the upper end oil inlet is also connected with a pipeline pump 26. The lower end of the melting oil pipe extends into the continuous melting pot 19 and is located between the live steam coil 25 and the slag discharge port 21. The other structures of the continuous melting pot in this embodiment are the same as those in the second embodiment.

[0040] As Figure 5 Shown in the fourth embodiment, in this embodiment, there are a front continuous melting pot 1 and a rear continuous melting pot 2, a front melting oil pipe 22 and a rear melting oil pipe 23. The oil inlet ends and the oil outlet ends of the front melting oil pipe 22 and the rear melting oil pipe 23 are respectively equipped with reflux valves, and the oil inlet end of each melting oil pipe is equipped with a pipeline pump; the upper end of the front melting oil pipe 22 communicates with the upper part of the front continuous melting pot 1, and the lower end of the front melting oil pipe extends into the front continuous melting pot 1 and is located between the live steam coil and the slag discharge port; the upper end of the rear melting oil pipe 23 communicates with the upper part of the rear continuous melting pot 2, and the lower end of the melting oil pipe extends into the rear continuous melting pot and is located between the live steam coil and the slag discharge port. The other structures of the front continuous melting pot 1 and the rear continuous melting pot 2 are the same as those in other embodiments.

[0041] The present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An efficient continuous melting device for rosin, comprising a continuous melting pot. A steam pipe with a steam valve and a pressure gauge is provided at the lower part of the continuous melting pot. The outlet end of the steam pipe is communicated with a live steam coil pipe arranged at the lower part inside the continuous melting pot. A slag discharge port with a slag discharge valve is provided at the bottom of the continuous melting pot. It is characterized in that: A melting oil pipe with a reflux valve is connected to the side wall of the continuous melting pot. The upper end of the melting oil pipe communicates with the upper part of the continuous melting pot, and the lower end of the melting oil pipe extends into the continuous melting pot at a position between the live steam coil and the slag discharge port.

2. The high-efficiency continuous rosin melting device according to claim 1, wherein: There are two continuous melting pots, namely a front continuous melting pot and a rear continuous melting pot. The front continuous melting pot is connected to a rosin transition tank through a pipeline. A rosin conveyor is provided between the front continuous melting pot and the pipeline. The pipeline is also respectively connected to an oil pipe with a melting oil valve and a flow meter and a water pipe with an oxalic acid water valve and a flow meter. The front continuous melting pot and the rear continuous melting pot are communicated through a connecting pipe; a discharge pipe with a valve is provided at the upper part of the rear continuous melting pot, and the discharge pipe is connected to a filtering device; a cleaning pipe with a cleaning valve is installed below the discharge pipe orifice of the rear continuous melting pot; the input end of the melting oil pipe is connected to a pipeline pump.

3. The high-efficiency continuous rosin melting device according to claim 2, wherein: The upper end of the melting oil pipe communicates with the upper part of the front continuous melting pot, and the lower end thereof is connected to a branch pipe with reflux valves at both ends. The two ends of the branch pipe respectively extend into the front continuous melting pot at a position between the live steam coil and the slag discharge port and the rear continuous melting pot at a position between the live steam coil and the slag discharge port.

4. The highly efficient continuous rosin melting device according to claim 2, characterized in that: The upper end of the melting oil pipe communicates with the upper part of the rear continuous melting pot, and the lower end thereof is connected to a branch pipe with reflux valves at both ends. The two ends of the branch pipe respectively extend into the front continuous melting pot at a position between the live steam coil and the slag discharge port and the rear continuous melting pot at a position between the live steam coil and the slag discharge port.

5. The highly efficient continuous rosin melting device according to claim 3 or 4, characterized in that: The orifice of the connecting pipe extending into the rear continuous melting pot extends to the middle and lower part of the rear continuous melting pot.

6. The high-efficiency continuous rosin melting device according to claim 2, wherein: There are two melting oil pipes. The upper end of one melting oil pipe communicates with the upper part of the front continuous melting pot, and the lower end of the melting oil pipe extends into the front continuous melting pot at a position between the live steam coil and the slag discharge port; the upper end of the other melting oil pipe communicates with the upper part of the rear continuous melting pot, and the lower end of the melting oil pipe extends into the rear continuous melting pot at a position between the live steam coil and the slag discharge port. Each melting oil pipe is equipped with a pipeline pump.

7. A melting method of the high-efficiency continuous rosin melting device according to any one of claims 2-6, characterized in that, The melting steps are as follows: ① Before starting the machine, confirm that all valves are in the closed state and all instruments and equipment are operating normally; ② Inject sufficient oxalic acid water into the front continuous melting pot and the rear continuous melting pot. Stop adding oxalic acid water until water overflows from the opened cleaning pipe; ③ Pass steam into the front continuous melting pot and the rear continuous melting pot for heating, and heat the oxalic acid water in the pot to the set temperature; ④ When the temperatures of the two continuous melting pots reach the set temperature, start the rosin conveyor, control the rotation speed of the conveyor motor to make the feeding speed reach the required amount; open the melting oil valve, control the valve opening to make the flow rate of the melting oil reach the required amount; open the oxalic acid water valve, control the valve opening to make the flow rate of the oxalic acid water reach the required amount; ⑤ Control the opening of the steam valves of the front continuous melting pot and the rear continuous melting pot to keep the temperatures of the front continuous melting pot and the rear continuous melting pot within the set temperature range; ⑥ After observing that there is material flowing out of the discharge pipe, open the reflux valves at both ends of the melting oil pipe, start the pipeline pump, supply melting oil to the bottom of the continuous melting pot, and the device starts to operate stably; ⑦ Calculate the sand discharge cycle according to the sand content in the rosin, perform sand discharge operations regularly, observe the sand content in the drained water, close the slag discharge valve after the sand and gravel are completely discharged, and close the reflux valve.

8. The method for efficient continuous melting of pine resin according to claim 7, characterized in that: The set temperatures in steps ③ and ④ are 90 °C; in step ⑤, the set temperature range is between 85 °C and 97 °C.

9. The high-efficiency continuous melting method of rosin according to claim 8, characterized in that: In step ⑤, the temperature of the front continuous melting pot is maintained between 85 and 90 °C, and the temperature of the rear continuous melting pot is maintained between 92 and 97 °C; in step ⑥, open the reflux valve at the upper end of the melting oil pipe and the reflux valve at the end of the branch pipe connected to the front continuous melting pot, start the pipeline pump, and supply melting oil to the bottom of the front continuous melting pot; in step ⑦, when performing sand discharge regularly, open the reflux valve at the end of the branch pipe connected to the rear continuous melting pot, close the reflux valve of the branch pipe opened in step ⑥, open the slag discharge valve of the front continuous melting pot after the bottom of the pot is supplied with oil to discharge slag, observe the sand content in the drained water, close the slag discharge valve after the sand and gravel are completely discharged, open the reflux valve at the end of the branch pipe connected to the front continuous melting pot again, close the reflux valve at the end of the branch pipe connected to the rear continuous melting pot, open the slag discharge valve of the rear continuous melting pot to discharge slag, observe the sand content in the drained water, and close the slag discharge valve after the sand and gravel are completely discharged.

10. The high-efficiency continuous melting method of rosin according to claim 8 or 9, characterized in that: Thermometers are respectively installed on the bodies of the front continuous melting pot and the rear continuous melting pot.

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