Thermal device for asphalt mixture production

Abstract

The present invention discloses a heat-using device for asphalt mixture production, which includes heat-using equipment, a heating circulation system, and an electrical system control cabinet. Specifically, the device includes the following steps: Step 1, forcing the heat-conducting oil to circulate in the system through a high-temperature circulating oil pump in the heating circulation system, and transferring the heat to the asphalt that needs to be heated; Step 2, returning the heat-conducting oil after unloading in Step 1 to the circulation pump, and supplying power to the electric heating pipe for heating again or multiple groups of power generation pipes for heating until the required temperature is reached; the present invention relates to the field of industrial electric heating technology. The heat-using device for asphalt mixture production solves the problem that the existing electric heater is an integrated structure by providing a connection component. When one of the electric heating pipes is damaged, the entire electric heater needs to be replaced, resulting in increased production costs that are not conducive to enterprise production, and the inability to recycle resources, resulting in waste of resources.

Description

Technical Field

[0001] The invention relates to the technical field of industrial electric heating, in particular to a heat-using device for asphalt mixture production. Background Art

[0002] The thermal oil electric heating system is a new type of heat energy conversion heating system. Unlike traditional boiler heating systems that use diesel or coal as fuel, this system uses electricity as energy and converts electrical energy into heat energy through electric heaters. It uses an organic heat carrier (thermal oil) as the heat transfer medium and forces the thermal oil to circulate in the system through a high-temperature circulating oil pump, thereby achieving the purpose of continuously obtaining the required heat energy for the asphalt in the heating equipment (asphalt tank). In addition, the process temperature can be set in the control cabinet and high-precision temperature control requirements can be achieved through pressure controllers, temperature sensors, and PLC controllers.

[0003] After long-term use, the heating elements inside the existing electric heaters will be deformed and need to be replaced. In addition, the existing electric heaters are an integrated structure. For example, the electric heater is an electric heater that performs centralized heating by welding several electric heating tubes on a flange. When one of the electric heating tubes is damaged, the entire electric heater needs to be replaced, which increases production costs and wastes resources as resources cannot be recycled. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a heat-using device for asphalt mixture production, which solves the technical problems mentioned in the background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a heat-using device for asphalt mixture production includes heat-using equipment, a heating circulation system, and an electrical system control cabinet, wherein the electrical equipment is an asphalt tank, and the heating circulation system is composed of an electric heater, a circulation pump, a circulation pipeline, an expansion tank, various functional control valves, and various functional sensor controllers, and specifically includes the following steps:

[0006] Step 1: The heat transfer oil is forced to circulate in the system through the high-temperature circulating oil pump in the heating circulation system. The oil passes through the oil outlet valve and the oil supply pipeline to the coil in the asphalt tank of the heating equipment. The heat is then transferred to the asphalt to be heated through the coil.

[0007] Step 2: The heat transfer oil after the temperature reduction in step 1 is returned to the circulation pump through the oil return pipe and the oil-gas separator. At this time, the temperature of the electric heater container drops, and the electric heating pipe is powered on again for heating or multiple groups of power generation pipes are put into heating. The asphalt is continuously heated in this way until it reaches the required temperature.

[0008] The electric heater includes a heating cylinder, one end of the heating cylinder is fixed with a detachable mounting flange by screws, and the other end of the mounting flange is fixed with a sealing plate by screws, the other end of the mounting flange is provided with an electric heating tube inside the heating cylinder, the inner cavity of the mounting flange is fixedly connected to a fixing disk, and the fixing disk is provided with several connecting components near one end of the electric heating tube, and the electric heating tubes are all installed on the mounting flange through the connecting components.

[0009] Preferably, a liquid inlet is provided at one end of the heating cylinder, and a liquid outlet is provided at the bottom of the other end of the heating cylinder.

[0010] Preferably, the electric heating tube is sealed and plugged into the inner cavity of the mounting flange at one end close to the connecting assembly and is fixedly connected to a terminal, and a circular ring is fixedly connected to the outer wall of the terminal.

[0011] Preferably, the connecting assembly includes an adjusting rod rotatably mounted on a fixed plate, the outer wall of the adjusting rod is threadedly connected to a support frame, the outer wall of the support frame is provided with three groups of mounting grooves in a circumferential array, the inner wall of the mounting groove is rotatably connected to a clamping block, the inner wall of the mounting groove is provided with a torsion spring, the two ends of the torsion spring are respectively fitted with the clamping block and the inner wall of the mounting groove, the support frame is fixedly connected to a push ring on the side away from the electric heating tube, and the push ring is sleeved on the adjusting rod, the outer wall of the push ring is threadedly connected to a connecting shaft, the connecting shaft is fixedly connected to a threaded ring close to the clamping block, and one end of the threaded ring is fitted with one end of the clamping block.

[0012] Preferably, the clamping block is L-shaped, and a rounded corner is provided at one end of the clamping block close to the threaded ring.

[0013] Preferably, the outer side of the electric heating tube is sleeved with a silicone sleeve, the outer side of the silicone sleeve is sleeved with a seamless steel pipe, and the outer side of the seamless steel pipe is sleeved with a container flange plate.

[0014] Preferably, a second circular through hole is opened in the middle of the heating cylinder, the inner diameter of the second circular through hole is the same as the outer diameter of the container flange plate, and the second circular through hole and the container flange plate are clearance-matched. Beneficial effects

[0015] The present invention provides a heat-using device for asphalt mixture production. Compared with the prior art, it has the following advantages:

[0016] (1) The heating device for asphalt mixture production removes the restriction on the electric heating tube through the provided connection assembly. The damaged electric heating tube can be taken out and then replaced with a new one. During the entire replacement process, there is no need to dismantle the entire electric heater, only the damaged electric heating tube needs to be removed, and no medium leakage will occur during the loading and unloading process. It is convenient and fast, greatly reducing production costs and labor intensity, and solving the problem that the existing electric heater is an integrated structure. When one of the electric heating tubes is damaged, the entire electric heater needs to be replaced, resulting in increased production costs that are not conducive to enterprise production, and the problem that resources cannot be recycled and lead to waste of resources.

[0017] (2) The heating device for producing asphalt mixture is equipped with a container flange plate and a silicone sleeve, which effectively prevents the electric heating pipe from being scratched during replacement and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a heat supply circulation system of a thermal oil heater according to the present invention;

[0019] Figure 2 Design a working principle diagram for the heating circulation system of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the electric heater in the present invention;

[0021] Figure 4 This is a disassembled diagram of the heating cylinder and the mounting flange in the present invention;

[0022] Figure 5 Schematic diagram of the structure of the electric heating tube in the present invention;

[0023] Figure 6 Schematic diagram of the structure of the connection assembly in the present invention;

[0024] Figure 7 This is the main circuit diagram of the electrical control cabinet in the present invention;

[0025] Figure 8 This is the control circuit diagram of the electrical control cabinet in the present invention.

[0026] In the figure: 1. Heating cylinder; 2. Mounting flange; 3. Electric heating tube; 4. Fixing plate; 5. Connecting assembly; 101. Liquid inlet; 102. Liquid outlet; 301. Terminal; 302. Ring; 303. Silicone sleeve; 304. Seamless steel pipe; 305. Container flange plate; 501. Adjusting rod; 502. Support frame; 503. Mounting groove; 504. Clamp; 505. Torsion spring; 506. Connecting shaft; 507. Threaded ring; 508. Push ring. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figures 1-8 The present invention provides a technical solution: a heat-using device for asphalt mixture production, including heat-using equipment, a heating circulation system, and an electrical system control cabinet, wherein the electrical equipment is an asphalt tank. The heat-using equipment (asphalt tank) uses existing products on the market and can be purchased directly without redesign. The heated tank body and pipeline use the original boiler heat transfer system and do not need to be redesigned. The heating element can adopt a tubular clustered electric heating element structure, a rod-shaped electric heating element structure, etc. according to needs. The heating circulation system is composed of an electric heater, a circulation pump, a circulation pipeline, an expansion tank, various functional control valves and various functional sensor controllers. The electrical control cabinet control panel is equipped with display, adjustment, operation, alarm indication and other devices; power supply, protection, drive, signal conversion and other devices are set inside. The main function of the electrical system control cabinet design is to timely turn on and off the power supply of the heat-adding device, accurately and effectively control the temperature of the heat-conducting oil, and to work safely and reliably by processing signals from pressure sensors, liquid level sensors, temperature sensors, thermal relays, etc. The control system is a closed-loop negative feedback system The temperature controller outputs a DC15V, 20mA logic level according to the determined PID (PID can be automatically calculated and generated using the instrument's built-in AT self-tuning) to drive a zero-crossing contactless controller to control the output power of the thermal oil heater. The main circuit is composed of four groups of heating tubes, which can automatically start or cut off the power supply according to different temperature settings. The control circuit system mainly processes the signals input by the temperature sensor and thermal relay to the temperature controller. The temperature controller is a closed-loop negative feedback system. The temperature controller transmits the detected temperature signal to the intelligent PID temperature controller by the temperature measuring element (temperature sensor). The temperature controller outputs a DC15V, 20mA logic level according to the determined PID (PID can be automatically calculated and generated using the instrument's built-in AT self-tuning) to drive a zero-crossing contactless controller to control the output power of the thermal oil heater's heating tubes, thereby achieving the purpose of automatic heating.

[0029] High and low pressure alarm: When the pressure of the circulation system is too low or too high, the upper or lower limit set by the electric contact pressure gauge will send a signal, which will be processed by the PLC and then send out an audible and visual signal, and at the same time cut off the power supply of the heater and the circulation pump.

[0030] Over-temperature alarm: When the oil temperature at the outlet of the thermal oil heater exceeds the set temperature value of the temperature regulator (generally set above the process temperature and below the allowable operating temperature of the thermal oil), the electric control cabinet will emit an audible and visual alarm signal, and the system will automatically stop heating. The specific steps include:

[0031] Step 1: The heat transfer oil is forced to circulate in the system through the high-temperature circulating oil pump in the heating circulation system. The oil passes through the oil outlet valve and the oil supply pipeline to the coil in the asphalt tank of the heating equipment. The heat is then transferred to the asphalt to be heated through the coil.

[0032] Step 2: The heat transfer oil after the temperature reduction in step 1 is returned to the circulation pump through the oil return pipe and the oil-gas separator. At this time, the temperature of the electric heater container drops, and the electric heating pipe 3 is powered again for heating or multiple groups of power generation pipes are put into heating. The circulating asphalt is continuously heated until it reaches the required temperature.

[0033] The thermal oil electric heating system is a new type of heat energy conversion heating system. Unlike traditional boiler heating systems that use diesel or coal as fuel, this system uses electricity as its energy source, converting electrical energy into heat energy through electric heaters, and uses an organic heat carrier (thermal oil) as the heat transfer medium. The thermal oil is forced to circulate in the system through a high-temperature circulating oil pump, thereby achieving the purpose of continuously obtaining the required heat energy for the asphalt in the heating equipment (asphalt tank). In addition, the process temperature can be set in the control cabinet and high-precision temperature control requirements can be achieved through pressure controllers, temperature sensors, and PLC controllers.

[0034] Working principle of the heating circulation system: the electric heating tube 3 in the electric heater is sealed in a special heating cylinder 1, and is filled with heat transfer oil around it. The heating cylinder 1 is preset with a liquid inlet 101, a liquid outlet 102, and a temperature detection port. After the electric heating tube 3 is powered on, it generates heat energy to continuously increase the temperature of the heat transfer oil. When the set temperature is reached, the electric heating tube 3 is powered off or the number of electric heating tubes 3 is reduced. At the same time, the circulation pump forces the heat transfer oil to flow through the oil outlet valve and the oil supply pipeline to reach the coil in the asphalt tank of the heating equipment. The heat is transferred to the asphalt to be heated through the coil. The unloading heat transfer oil returns to the circulation pump through the return oil pipeline and the oil-gas separator. At this time, the temperature of the electric heater container drops, and the electric heating tube 3 is powered on again for heating or multiple groups of generating tubes are put into heating. In this way, the circulating asphalt is continuously heated until the required temperature is reached.

[0035] When thermal oil is first put into use, it requires dehydration. When the oil is heated to above 100°C, the water vapor in the oil decomposes and enters the high-position expansion tank through the exhaust valve, and then is discharged through the exhaust port. In addition, some of the high-temperature oil-gas mixture undergoes initial separation in the oil-gas separator and continues to expand. In this case, the exhaust replenishment valve must be opened to allow the expanded oil-gas mixture to enter the expansion tank for further oil-gas separation. Finally, the water vapor is separated and discharged through the exhaust port. To completely remove the water from the oil, the exhaust valve must be closed after dehydration. The exhaust replenishment valve should also be closed when the circulation system reaches a certain pressure and stabilizes.

[0036] Thermal oil electric heating systems are easy to install and maintain, safe, energy-efficient, and pollution-free. They significantly reduce production costs, improve safety, and are pollution-free, resulting in high social and economic benefits. Compared to traditional boiler heating systems, electric heating systems offer greater scalability, with the potential for future expansion of remote and cloud-based monitoring systems. Overall, electric heating systems offer practical value in terms of cost-effectiveness, safety, and environmental friendliness compared to traditional boiler heating, making them worthy of widespread adoption.

[0037] The electric heater includes a heating cylinder 1, one end of the heating cylinder 1 is fixed with a detachable mounting flange 2 by screws, and the other end of the mounting flange 2 is fixed with a sealing plate by screws, the other end of the mounting flange 2 is provided with an electric heating tube 3 inside the heating cylinder 1, the inner cavity of the mounting flange 2 is fixedly connected with a fixing disk 4, and the fixing disk 4 is provided with several connecting components 5 near one end of the electric heating tube 3, and the electric heating tubes 3 are all installed on the mounting flange 2 through the connecting components 5.

[0038] like Figure 4 As shown, a liquid inlet 101 is provided at one end of the heating cylinder 1, and a liquid outlet 102 is provided at the bottom of the other end of the heating cylinder 1. In this embodiment, the liquid inlet 101 and the liquid outlet 102 are provided to facilitate the electric heating operation.

[0039] like Figure 5 As shown, the electric heating tube 3 is sealed and inserted into the inner cavity of the mounting flange 2 near one end of the connecting component 5 and is fixedly connected to the terminal post 301. The outer wall of the terminal post 301 is fixedly connected to a ring 302. The outer side of the electric heating tube 3 is sleeved with a silicone sleeve 303. The outer side of the silicone sleeve 303 is sleeved with a seamless steel pipe 304. The outer side of the seamless steel pipe 304 is sleeved with a container flange plate 305. A second circular through hole is opened in the middle position of the heating cylinder 1. The inner diameter of the second circular through hole is the same as the outer diameter of the container flange plate 305. The second circular through hole and the container flange plate 305 are clearance-matched. In this embodiment, the container flange plate 305 and the silicone sleeve 303 are transitionally matched, so that the electric heating tube 3 can be effectively prevented from being scratched during replacement and assembly.

[0040] like Figure 6 As shown, the connecting assembly 5 includes an adjusting rod 501 rotatably mounted on the fixed plate 4, the outer wall of the adjusting rod 501 is threadedly connected to the support frame 502, the outer wall of the support frame 502 is provided with three groups of mounting grooves 503 in a circumferential array, the inner wall of the mounting groove 503 is rotatably connected to a clamping block 504, the inner wall of the mounting groove 503 is provided with a torsion spring 505, the two ends of the torsion spring 505 are respectively fitted with the clamping block 504 and the inner wall of the mounting groove 503, the support frame 502 away from the electric heating tube 3 is fixedly connected to a push ring 508, and the push ring 508 is fixedly connected to the support frame 502 away from the electric heating tube 3. The movable ring 508 is sleeved on the adjusting rod 501, and the outer wall of the push ring 508 is threadedly connected to the connecting shaft 506. The connecting shaft 506 is fixedly connected to the threaded ring 507 on the side close to the clamping block 504. One end of the threaded ring 507 fits with one end of the clamping block 504. The clamping block 504 is L-shaped, and the clamping block 504 is provided with a rounded corner on the end close to the threaded ring 507. In this embodiment, when the electric heating tube 3 is damaged after the electric heater has been used for a long time, the power supply is first disconnected, the mounting flange 2 is opened, and the connecting shaft 50 is rotated to fix it. 6 drives the threaded ring 507 to rotate, so that the threaded ring 507 moves away from the electric heating tube 3, so that the threaded ring 507 contacts the restriction of the clamping block 504, and then rotates the adjusting rod 501 to drive the support frame 502 to move toward the electric heating tube 3, and cooperates with the elastic force of the torsion spring 505 to push the clamping block 504 to rotate on the support frame 502, so that the end of the clamping block 504 no longer forms a clamping restriction on the circular ring 302 on the electric heating tube 3, thereby releasing the restriction on the electric heating tube 3, taking out the damaged electric heating tube 3, and replacing it with a new one. During the entire replacement process, there is no need to disassemble the entire electric heater, only the damaged electric heating tube 3 needs to be disassembled, and no medium leakage will occur during the loading and unloading process; it is convenient and fast, greatly reduces production costs and reduces labor intensity, and solves the problem that the existing electric heater is an integrated structure, when one of the electric heating tubes 3 is damaged, the entire electric heater needs to be replaced, resulting in increased production costs, which is not conducive to enterprise production, and resources cannot be recycled and lead to waste of resources.

[0041] In this embodiment, the circuits and electronic components involved in the present invention are all existing technologies, which can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to internal structures and methods. It should be noted that the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. Machinery, parts and equipment all adopt conventional models in the existing technology, and the inventor will not elaborate on them here.

[0042] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0043] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0044] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. The heat-using device for asphalt mixture production includes heat-using equipment, a heating circulation system, and an electrical system control cabinet. The heat-using equipment is an asphalt tank, and the heating circulation system consists of an electric heater, a circulation pump, a circulation pipeline, an expansion tank, various functional control valves, and various functional sensor controllers. The characteristics are: The electric heater comprises a heating cylinder (1), one end of the heating cylinder (1) is fixed with a detachable mounting flange (2) by screws, and the other end of the mounting flange (2) is fixed with a sealing plate by screws, the other end of the mounting flange (2) is provided with an electric heating tube (3) located inside the heating cylinder (1), the inner cavity of the mounting flange (2) is fixedly connected with a fixing plate (4), and the fixing plate (4) is provided with a plurality of connecting components (5) near one end of the electric heating tube (3), and the electric heating tube (3) is mounted on the mounting flange (2) through the connecting components (5); The outer side of the electric heating tube (3) is sleeved with a silicone sleeve (303), the outer side of the silicone sleeve (303) is sleeved with a seamless steel pipe (304), and the outer side of the seamless steel pipe (304) is sleeved with a container flange plate (305); The connecting assembly (5) comprises an adjusting rod (501) rotatably mounted on a fixed plate (4); the outer wall of the adjusting rod (501) is threadedly connected to a support frame (502); the outer wall of the support frame (502) is provided with three groups of mounting grooves (503) in a circumferential array; the inner wall of the mounting groove (503) is rotatably connected to a clamping block (504); the inner wall of the mounting groove (503) is provided with a torsion spring (505); the two ends of the torsion spring (505) are respectively connected to the clamping block (504) in a circular array. and the inner walls of the mounting groove (503) fit together, the support frame (502) is fixedly connected to a push ring (508) on the side away from the electric heating tube (3), and the push ring (508) is sleeved on the adjusting rod (501), the outer wall of the push ring (508) is threadedly connected to a connecting shaft (506), and the connecting shaft (506) is fixedly connected to a threaded ring (507) on the side close to the clamping block (504), and one end of the threaded ring (507) fits together with one end of the clamping block (504); The heating method comprises the following steps: Step 1: The heat transfer oil is forced to circulate in the system through the high-temperature circulating oil pump in the heating circulation system. The oil passes through the oil outlet valve and the oil supply pipeline to the coil in the asphalt tank of the heating equipment. The heat is then transferred to the asphalt to be heated through the coil. Step 2: The heat transfer oil after the temperature reduction in step 1 is returned to the circulation pump through the oil return pipe and the oil-gas separator. At this time, the temperature of the electric heater container is reduced, and the electric heating pipe (3) is powered again for heating or multiple groups of power generation pipes are put into heating. In this way, the circulating asphalt is continuously heated until it reaches the required temperature.

2. The heat-using device for asphalt mixture production according to claim 1, characterized in that: A liquid inlet (101) is provided at one end of the heating cylinder (1), and a liquid outlet (102) is provided at the bottom of the other end of the heating cylinder (1).

3. The heat-using device for asphalt mixture production according to claim 1, characterized in that: One end of the electric heating tube (3) close to the connecting assembly (5) is sealed and plugged into the inner cavity of the mounting flange (2) and fixedly connected to a terminal post (301); the outer wall of the terminal post (301) is fixedly connected to a ring (302).

4. The heat-using device for asphalt mixture production according to claim 1, characterized in that: The clamping block (504) is L-shaped, and one end of the clamping block (504) close to the threaded ring (507) is provided with a rounded corner.

5. The heat-using device for asphalt mixture production according to claim 1, characterized in that: A second circular through hole is provided in the middle of the heating cylinder (1), the inner diameter of the second circular through hole is the same as the outer diameter of the container flange plate (305), and the second circular through hole and the container flange plate (305) are clearance-matched.

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