Full-automatic double-mold cavity quick-change and quick-assembly fuel type mold preheating machine

Abstract

This application discloses a fully automatic dual-cavity quick-change and quick-install fuel-fired mold preheater, including an electrical control system, a main oil tank installed in the frame, an air compressor, and a burner located outside the frame. The burner includes a holding tube, a combustion tube, an interface box, a nozzle, a combustion oil pipe, a third air supply pipe, an igniter, and a fan. The main oil tank is pressurized for fuel supply, and a small oil tank is set near the nozzle for buffering, pressurization, and pressure stabilization to ensure fuel pressure. A mixing chamber is formed in the nozzle. Pressurized fuel is first atomized and injected into the mixing chamber through the combustion oil pipe and mixed with compressed gas from the third air supply pipe. During the mixing process with the fuel atomization, the compressed gas further impacts and refines the fuel atomization droplets, forming a mixed combustion gas, which is then atomized again through the nozzle and injected into the combustion tube, forming a finer, fully atomized mixed combustion gas with higher combustion efficiency. Air is pumped into the combustion tube by the fan to assist combustion, further improving combustion efficiency.

Description

Technical Field

[0001] This application relates to the field of forging die preheating technology, specifically a fully automatic dual-cavity quick-change and quick-installation fuel-fired die preheating machine. Background Technology

[0002] Forging is a plastic forming process that uses a mold to heat metal materials to a set temperature to form forgings. During forging production, the mold must be preheated to extend its service life. The applicant has developed and disclosed a fully automatic mold preheating machine (application number 202520215832.9, authorization announcement number CN223657714U), which solves the technical problems of movable mold preheating machines, automated fuel replenishment control, and automatic fuel delivery for combustion. However, through use, it was found that this technical solution uses negative pressure to naturally deliver fuel to the flame nozzle, resulting in a relatively small fuel intake. While effective for preheating small molds (small heating area), when used for preheating large molds, this natural fuel intake method easily leads to insufficient atomization and incomplete combustion due to the need for a larger burner (flame nozzle). This results in insufficient heat generation and inadequate heating temperature, as well as significant smoke pollution and difficulty in starting. To address these issues, the applicant has continued research and development and has filed this application. Summary of the Invention

[0003] The purpose of this application is to provide a fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine to solve the problems in the prior art.

[0004] To achieve the above objectives, this application provides the following technical solution: a fully automatic dual-cavity quick-change and quick-install fuel-fired mold preheating machine, comprising an electrical control system, a frame as a movable carrier, a main oil tank installed inside the frame for storing fuel, an air compressor installed inside the frame below the main oil tank, and a burner located outside the frame and movable relative to the frame, wherein the burner includes: The grip tube has a hollow structure and flanges at both ends. The combustion tube is detachably connected to the flange at the outer end of the holding tube. Several flame holes are formed on the peripheral wall of the combustion tube. A protective plate is provided around the combustion tube to limit the flame ejected from the combustion tube to a set area. An interface box is connected to the flange at the other end of the gripping tube; The nozzle is installed inside the grip tube and has a channel for air passage between the grip tube and the outer wall of the nozzle. The nozzle forms a coaxially connected mixing chamber and an ejection orifice. The combustion oil pipe has one end connected to the mixing chamber through the outer circular sidewall of the nozzle, and the opening of the combustion oil pipe in the mixing chamber forms an injection port. The other end of the combustion oil pipe is used to receive fuel oil from the main oil tank and pressurized by the air compressor, and atomize it through the injection port and spray it into the mixing chamber. The third air supply pipe is coaxially connected to the end of the mixing chamber away from the nozzle, and is used to inject compressed gas from the air compressor into the mixing chamber to mix with the atomized fuel to form a mixed fuel gas, which is then atomized again through the nozzle and injected into the combustion pipe. An igniter is fixed side-by-side to the outside of the nozzle and the front end of the igniter is adapted to the position of the spray hole, for igniting the mixed fuel gas in the combustion tube; A fan, located inside the interface box, is connected to the electrical control system via an electrical signal and is activated at a set time. It supplies air through the grip tube toward the combustion tube to aid combustion and forms a cooling airflow between the grip tube, the nozzle, and the igniter.

[0005] Furthermore, a partition is horizontally arranged inside the interface box to divide the interface box into a first cavity and a second cavity. The first cavity is connected to the grip tube. The fan is located in the second cavity and fixed to the partition, and sends air to the first cavity through a through hole formed on the partition. The combustion oil pipe, the third gas supply pipe, and the conductive wire of the igniter all pass through the partition in a sealed manner and enter the second cavity.

[0006] Furthermore, the fan is an axial flow fan, and at least two are installed in series axially, with an air intake perforation formed on the interface box.

[0007] Furthermore, the burner also includes: A small oil tank is fixed inside the second cavity and has an oil inlet and an oil outlet. Both the oil inlet and the oil outlet are located on the bottom side wall of the small oil tank. The oil inlet is connected to the main oil tank through a distribution pipe and is used to introduce pressurized fuel from the main oil tank into the small oil tank. The oil outlet is connected to the combustion oil pipe. An air gap is always maintained at the top of the small oil tank so that the fuel entering the combustion oil pipe has a set pressure. The working oil valve is located on the combustion oil pipe and fixed in the second cavity, and is used to control the small oil tank to supply oil to the nozzle.

[0008] Furthermore, the fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine also includes: The main oil pipe is connected to the bottom of the main oil tank at one end and to the filter at the other end. The end of the branch oil pipe away from the small oil tank is connected to the output end of the filter, and the branch oil pipe is also equipped with an oil supply valve for cutting off or opening the branch oil pipe.

[0009] Furthermore, the fully automatic dual-cavity quick-change and quick-install fuel-fired mold preheater also includes a conversion component for switching the preheater between a start-up state and a normal operating state, and an adjustment component for regulating the combustion state. The conversion component includes: A first solenoid valve and a second solenoid valve are arranged in parallel between the air compressor and the third air supply pipe and are controlled by the electronic control system to open and close in a preset sequence. A pressure reducing valve is provided between the second solenoid valve and the third air supply pipe. When the preheater is in the start-up state, the second solenoid valve is energized for a preset time so that the compressed gas output by the air compressor is reduced in pressure by the pressure reducing valve and supplied to the third air supply pipe to obtain an initial gas concentration that is easy to ignite. After the start-up is completed, the second solenoid valve is de-energized and the first solenoid valve is turned on, so that the compressed gas output by the air compressor is directly supplied to the third air supply pipe to switch to normal operation. The regulating component includes a regulating valve disposed on the third air supply pipe for regulating the amount of compressed gas delivered to the nozzle via the third air supply pipe, thereby regulating the fuel-air mixing ratio.

[0010] Furthermore, the fully automatic dual-cavity quick-change and quick-install fuel-fired mold preheating machine also includes a switching component for switching the pressure in the main oil tank between positive and negative states. The switching component includes a two-position five-way solenoid valve, a single-stage vacuum generator, and a pressurizing valve controlled by the electronic control system. When both the pressurizing valve and the two-position five-way valve are energized, the compressed air output by the air compressor is injected into the main oil tank through the pressurizing valve and the two-position five-way valve via a connecting pipe to make the main oil tank positive. When both the pressurizing valve and the two-position five-way valve are de-energized, the pressurizing valve is closed, the compressed air output by the air compressor enters the single-stage vacuum generator through the two-position five-way valve, and the negative pressure generated by the single-stage vacuum generator is connected to the connecting pipe through the two-position five-way valve to generate negative pressure in the main oil tank; the connecting pipe is connected to the top of the main oil tank.

[0011] Furthermore, the fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine also includes: A one-way valve is installed on the top of the main oil tank and allows one-way flow towards the main oil tank. An oil suction pipe, connected to the one-way valve and extending out of the frame, is used to draw external fuel into the main oil tank when the pressure inside the main oil tank is negative.

[0012] Furthermore, the fireproof plate includes: The horizontal plate is connected to the outer circle of the combustion tube and is parallel to the horizontal radial surface of the combustion tube. The longitudinal length of the horizontal plate is adapted to the axial length of the combustion tube. The inclined plate portion extends symmetrically and in opposite directions from the outer end of the horizontal plate portion, and the two inclined plate portions located on the same side of the horizontal plate portion have an included angle D = 55°~65°. A straight plate section is connected to both ends of the inclined plate section and the horizontal plate section, and is connected to the combustion tube; the inclined plate section, the horizontal plate section, the straight plate section, and the combustion tube together form two mutually opposing open mouths to cover the mold cavities of the two corresponding heated molds; wherein, the edge of the straight plate section away from the holding tube is lower than the edge of the inclined plate section to form a notch for exhausting waste flame.

[0013] Furthermore, both the interface box and the combustion tube are connected to the grip tube via quick-release clamps.

[0014] The beneficial technical effects of this application are as follows: The fully automatic dual-cavity quick-change and quick-install fuel-fired mold preheater provided by this application uses pressurized main oil tank for fuel supply to the combustion tube. At the same time, a small oil tank is set near the nozzle to buffer, pressurize and stabilize the fuel pressure, and a mixing chamber is formed in the nozzle. Pressurized fuel is first atomized and injected into the mixing chamber from the combustion oil pipe and mixed with compressed gas from the third air supply pipe. During the mixing process with the fuel mist, the compressed gas further impacts and refines the oil mist droplets, forming a mixed combustion gas, which is then atomized again through the nozzle and injected into the combustion tube, forming a more fine and fully atomized mixed combustion gas, resulting in higher combustion efficiency and fuel saving. Air is pumped into the combustion tube by a fan to assist combustion, further improving combustion efficiency. It also has the effect of preventing heat conduction to the holding pipe and interface box, which is far superior to the existing technology. Attached Figure Description

[0015] Figure 1 This is a perspective view of the fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheater of this application; Figure 2 This is a three-dimensional schematic diagram of the fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheater of this application. Figure 3 This is a partial perspective view of the fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine of this application; Figure 4 This is a partial view of the fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine of this application; Figure 5 This is a partial perspective view of the fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine of this application from another angle. Figure 6 This is a partial perspective view of the burner of the fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheater of this application; Figure 7 This is a cross-sectional schematic diagram of the burner of the fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheater of this application; Figure 8 This is a top view of the burner of the fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheater of this application; Figure 9 for Figure 8 Sectional view of AA; Figure 10 for Figure 8 BB section view in the middle; Figure 11 This is a cross-sectional view of the small oil tank of the fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheater of this application; Figure 12 This is a magnified view of a portion of point C in the image; Figure 13 This is a schematic diagram of another embodiment of the nozzle structure of the fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheater of this application; In the diagram: 1. Frame; 2. Burner; 3. Protective pipe; 4. Suction pipe; 5. Main oil tank; 6. Air compressor; 7. Electrical control system; 8. Main oil pipe; 9. Filter; 10. Distribution pipe; 11. Oil supply valve; 12. Small oil tank; 13. Working oil valve; 14. Combustion oil pipe; 1401. Injection port; 15. Nozzle; 1501. Mixing chamber; 1502. Injection hole; 1503. Conical surface; 1504. Nozzle head; 16. Support frame; 17. Holding pipe; 1701. Channel; 18. Combustion pipe; 19. Flame hole; 20. Flame guard plate; 201. Notch; 202. Horizontal plate section; 203. Inclined plate section; 204. Straight plate section; 21. Main air pipe; 22. Pressurization valve; 23. Manifold. 24. Flow plate; 25. Single-stage vacuum generator; 26. Two-position five-way solenoid valve; 27. Connecting pipe; 28. First solenoid valve; 29. ​​First air supply pipe; 30. Second solenoid valve; 31. First relay pipe; 32. Pressure reducing valve; 33. Second air supply pipe; 34. T-junction; 35. Second relay pipe; 36. Regulating valve; 37. Third air supply pipe; 38. Ignition device; 39. Conductive wire; 30. Interface box; 3901. First cavity; 3902. Second cavity; 3903. Air inlet vent; 40. Partition plate; 41. Fan; 42. Top cover; 43. Placement rack; 44. Pressure relief valve; 45. Check valve; 46. Quick-release clamp; 47. Liquid level sensor; 48. Pressure sensor; 49. Flange. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] Please see Figure 1-13 A fully automatic dual-cavity quick-change and quick-install fuel-fired mold preheating machine includes an electrical control system 7, a frame 1 as a movable carrier, a main oil tank 5 installed inside the frame 1 for storing fuel, an air compressor 6 installed inside the frame 1 below the main oil tank 5, and a burner 2 located outside the frame 1 and movable relative to the frame 1. In a preferred embodiment, a fixing plate or crossbeam can be installed inside the frame 1 to divide the frame 1 into different functional compartments. In this embodiment, a fixing plate is used to support the main oil tank 5, and a base plate is installed at the bottom of the frame 1 to support the air compressor 6. The burner 2 includes a holding tube 17, a combustion tube 18, an interface box 39, a nozzle 15, a combustion oil pipe 14, a third air supply pipe 36, an igniter 37, and a fan 41. The holding tube 17 is a hollow structure with flanges 49 at both ends; the combustion tube 18 is detachably connected to the flanges 49 at the outer end of the holding tube 17, and several flame holes 19 are formed on the peripheral wall of the combustion tube 18. A protective plate 20 is provided around the combustion tube 18 to limit the flame ejected from the combustion tube 18 to a set area; the interface box 39 is connected to the flanges 49 at the other end of the holding tube 17. The nozzle 15 is installed inside the holding tube 17 and there is a channel 1701 for air to pass through between the holding tube 17 and the outer wall of the nozzle 15. The nozzle 15 forms a mixing chamber 1501 and an ejection hole 1502 that are coaxially connected. One end of the combustion oil pipe 14 is connected to the mixing chamber 1501 through the outer circular side wall of the nozzle 15, and the opening of the combustion oil pipe 14 in the mixing chamber 1501 forms the injection port 1401. The other end of the combustion oil pipe 14 is used to receive fuel from the main oil tank 5 and pressurized by the air compressor 6 and atomized and injected into the mixing chamber 1501 through the injection port 1401. The third air supply pipe 36 is coaxially connected to the end of the mixing chamber 1501 furthest from the nozzle 1502. It is used to inject compressed gas from the air compressor 6 into the mixing chamber 1501 to mix with atomized fuel to form a fuel-fuel mixture. This mixture is then atomized again through the nozzle 1502 and injected into the combustion pipe 18. The diameter of the mixing chamber 1501 is larger than the diameter of the nozzle 1502, and a conical surface 1503 is formed at the bottom of the mixing chamber 1501 facing the nozzle 1502. The cone angle E of the conical surface 1503 is 115°~120°, preferably 118°. Thus, the compressed gas in the third air supply pipe 36 is injected into the mixing chamber 1501 and atomized... During the subsequent fuel mixing process, some fuel droplets impact the conical surface 1503, where they are further atomized and refined under the impact force. The mixture is then guided along the conical surface 1503 to flow into the nozzle 1502 and be ejected, further enhancing atomization and air-fuel mixing uniformity, thereby improving combustion efficiency. In this embodiment, the nozzle 15 is fixedly mounted inside the holding tube 17 by a retainer 16. The retainer 16 can be made of sheet metal and has holes through which the nozzle 15 and igniter 37 pass, as well as equally spaced branches for contact with the inner wall of the holding tube 17. The holes through which the nozzle 15 passes are coaxial with the holding tube 17. During assembly, first, the nozzle 15 and igniter 37 are passed through the corresponding holes on the retainer 16 and fastened to the retainer 16 as a whole with fasteners. Alternatively, threads can be machined on the outer surface of the nozzle 15, and then the retainer 16 can be locked to the outer wall of the nozzle 15 with paired thin nuts. To improve the stability of the nozzle 15, in this embodiment, the retainer 16 has two spaced-apart units. The combustion oil pipe 14 and the third air supply pipe 36 are correspondingly installed and connected to the nozzle 15 to form a single component. The combustion oil pipe 14 and the third air supply pipe 36 adopt a two-section structure, meaning that at least one section connected to the nozzle 15 is made of metal. For example, copper or stainless steel pipes can be used, which can be connected to the nozzle 15 by welding processes such as brazing, laser welding, or threaded joints (understandably, when using a threaded joint, the oil nozzle 1401 is formed on a threaded interface fixed to the nozzle). Then, a high-pressure hose is connected to the corresponding working oil valve 13 (see below) or regulating valve 35. Then, the component is installed into the holding tube 17 to complete the fixation. The fixation method can be to spot weld the branch of one retainer 16 near the end of the holding tube 17 to the holding tube 17 to form an integral structure, while the other retainer 16 serves as an auxiliary support. Furthermore, the nozzle 15 can be a one-piece structure or a split structure, that is, the head of the nozzle 15 uses a nozzle head 1504 that is detachably connected by threads. (See detailed description below.) Figure 13 The nozzle 15 in this application adopts a split structure, which allows for easy replacement when the nozzle head 1504 is damaged, effectively reducing maintenance costs. Ignition device 37 is fixed side by side to the outside of nozzle 15 and the front end of ignition device 37 is adapted to the position of nozzle 1502. It is used to ignite the mixed gas in combustion tube 18. In this embodiment, ignition device 37 is a silicon nitride ignition rod and is connected to support frame 16 in the same fixing method as nozzle 15. The fan 41 is located in the interface box 39 and is connected to the electrical control system 7 by electrical signal. It is activated at a set time to supply air to the combustion tube 18 through the holding tube 17 to assist combustion and to form a cooling airflow between the holding tube 17, the nozzle 15 and the igniter 37.

[0018] In this embodiment, the bottom of the frame 1 is equipped with casters with brakes. Releasing the brakes allows movement, and pressing the brakes brings the machine to a stable stop. A placement rack 43 is installed on the top of the frame 1 to hold the burner 2 in a non-operating state, facilitating the movement of the entire machine and making it convenient for use in forging workshops. The electrical control system 7 can be a conventional electrical control system consisting of a touch screen and a PLC. Based on the structure provided in this embodiment, the fully automatic dual-cavity quick-change and quick-install fuel-fired mold preheater provided in this application uses pressurized main oil tank 5 for oil supply to the combustion pipe 18. Simultaneously, a small oil tank 12 is installed near the nozzle 15 for buffering and pressurization. The pressure is stabilized to ensure fuel pressure, and a mixing chamber 1501 is formed in the nozzle 15. Pressurized fuel is first atomized and injected into the mixing chamber 1501 by the combustion fuel pipe 14 and mixed with compressed gas from the third air supply pipe 36. During the mixing process with the fuel mist, the compressed gas further impacts and refines the fuel mist droplets, forming a mixed fuel gas, which is then atomized again by the injection hole 1502 and injected into the combustion pipe 18 to form a fully atomized mixed fuel gas with finer droplets. This results in more complete combustion, higher combustion efficiency, and fuel savings. Air is pumped into the combustion pipe 18 by the fan 41 to assist combustion, further improving combustion efficiency. It also has the effect of preventing heat conduction to the holding pipe 17 and the interface box 39, which is far superior to the existing technology.

[0019] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 13A partition 40 is horizontally arranged inside the interface box 39, dividing the interface box 39 into a first cavity 3901 and a second cavity 3902. The first cavity 3901 is connected to the holding tube 17. The fan 41 is located inside the second cavity 3902 and fixed on the partition 40, and blows air into the first cavity 3901 through a through hole formed in the partition 40. The conductive wires 38 of the combustion oil pipe 14, the third air supply pipe 36, and the igniter 37 all pass through the partition 40 in a sealed manner to enter the second cavity 3902, preventing the air pumped into the first cavity 3901 from leaking back into the second cavity 3902. According to the above structure provided in this embodiment, the fan 41 is electrically connected to the electronic control system 7, and the electronic control system 7 controls the start and stop of the fan 41. More preferably, the interface box 39 is sealed and detachably equipped with a top cover 42, so that the air pumped by the fan 41 can be effectively delivered to the combustion pipe 18 through the first cavity 3901, and it is convenient for the installation and maintenance of the components in the second cavity 3902.

[0020] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 13 The fan 41 is an axial flow fan, and at least two are installed in series axially. An air inlet perforation 3903 is formed on the interface box 39. In this way, the air volume and air pressure can be effectively increased in a limited space, resulting in better combustion and cooling effects. The working principle is as follows: After the mold is preheated, the oil and gas supply is stopped and the flame is extinguished. After the burner 2 is removed from the mold and placed back on the placement rack 43, the fan 41 can continue to work for a set time under the control of the electronic control system 7 to allow the burner 2 to cool down completely. It is understandable that since the burner 2, especially the fire guard plate 20, is still hot when it stops working, the burner 2 can be removed from the mold and placed back on the placement rack 43 with the help of appropriate auxiliary tools such as pliers. At the same time, due to the action of the fan 41, the rear part of the holding tube 17 is also at room temperature. That is, the burner 2 can also be removed from the mold by holding the end of the holding tube 17 near the interface box 39 after wearing protective gear such as gloves.

[0021] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 13 The burner 2 also includes a small oil tank 12 and a working oil valve 13, wherein: The small oil tank 12 is fixed inside the second cavity 3902, forming an oil inlet and an oil outlet. Both the oil inlet and the oil outlet are located on the bottom side wall of the small oil tank 12. The oil inlet is connected to the main oil tank 5 through the oil distribution pipe 10, which is used to introduce the pressurized fuel in the main oil tank 5 into the small oil tank 12. The oil outlet is connected to the combustion oil pipe 14. The top of the small oil tank 12 always maintains an air gap so that the fuel entering the combustion oil pipe 14 has a set pressure. The working oil valve 13 is provided on the combustion oil pipe 14 and fixed inside the second cavity 3902, which is used to control the small oil tank 12 to supply oil to the nozzle 15. In this embodiment, the working oil valve 13 is a solenoid valve and is connected to the electronic control system 7 by electrical signal and controlled by the electronic control system. The small oil tank 12 is provided with a liquid level sensor 47 connected to the electronic control system 7 by electrical signal to detect the amount of oil in the small oil tank 12 in real time. According to the structure provided in this embodiment, when the amount of fuel in the small fuel tank 12 deviates from the preset value, the fuel supply valve 11 (described later) is switched on and off to either force fuel from the main fuel tank 5 into the small fuel tank 12 or prevent fuel from the main fuel tank 5 from being forced into the small fuel tank 12. That is, when the amount of fuel supplied from the main fuel tank 5 to the small fuel tank 12 is greater than the amount of fuel output from the small fuel tank 12, the air in the small fuel tank 12 is compressed, and the amount of fuel stored increases. When the fuel supply valve 11 is closed, the fuel in the small fuel tank 12 is forced out by its own internal gas pressure. This cycle repeats, effectively preventing pressure fluctuations in the main fuel tank 5 from affecting the fuel injection pressure, and has a relatively high efficiency. The small fuel tank 12 has a good stabilizing effect. On the other hand, since the volume of the small fuel tank 12 is much smaller than that of the main fuel tank 5, that is, the cross-sectional area is also much smaller than that of the main fuel tank 5, the small fuel tank 12 compresses the air at the top when fuel is introduced, which has a significant boosting effect on the fuel output from the small fuel tank 12. Furthermore, through the real-time detection function of the liquid level sensor 47, the amount of fuel in the small fuel tank 12 can be precisely controlled. In this way, the amount of fuel compression of the air at the top by the fuel in the small fuel tank 12 is also controlled, that is, the boosting pressure value is also precisely controlled, achieving the effect of boosting and stabilizing pressure. This is conducive to better atomization when the fuel is injected into the mixing chamber 105 from the fuel injector 1401, thereby improving combustion efficiency.

[0022] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 13 The fully automatic dual-cavity quick-change and quick-install fuel-fired mold preheater also includes a main oil pipe 8, wherein: one end of the main oil pipe 8 is connected to the bottom of the main oil tank 5, and the other end is connected to the filter 9; the end of the branch oil pipe 10 away from the small oil tank 12 is connected to the output end of the filter 9, and the branch oil pipe 10 is also equipped with an oil supply valve 11 for cutting off or opening the branch oil pipe 10. According to the structure provided in this embodiment, a main oil pipe 8 is used to export the fuel in the main oil tank 5 to the filter 9 for filtration, and then the filtered fuel is delivered to the nozzle 15 to avoid clogging of the nozzle 15. In a further preferred embodiment, when there are two burners 2, a three-way valve can be conveniently set at the output port of the filter 9, and then connected to the corresponding oil distribution pipe 10 and oil supply valve 11 with the same configuration, so as to supply fuel to the other burner 2. It is understood that the oil supply valve 11 is a solenoid valve and is controlled by the electronic control system 7.

[0023] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 13 The fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheater also includes a conversion component for switching the preheater between start-up and normal operation states, and an adjustment component for regulating the combustion state. The conversion component includes: A first solenoid valve 27 and a second solenoid valve 29 are arranged in parallel between the air compressor 6 and the third air supply pipe 36 and are controlled by the electronic control system 7 to open and close according to a preset timing sequence. A pressure reducing valve 31 is installed between the second solenoid valve 29 and the third air supply pipe 36. During the preheater startup state, the second solenoid valve 29 is energized for a preset time, causing the compressed gas output from the air compressor 6 to be reduced in pressure by the pressure reducing valve 31 before being supplied to the third air supply pipe 36 to obtain an easily ignitable initial fuel concentration. After startup, the second solenoid valve 29 is de-energized while the first solenoid valve 27 is opened, allowing the compressed gas output from the air compressor 6 to be directly supplied to the third air supply pipe 36 for conversion. In normal operating condition; in this embodiment, a manifold 23 is installed on the frame 1, and the output port of the air tank of the air compressor 6 is connected to the input port of the manifold 23 through the main air pipe 21. The first solenoid valve 27 and the second solenoid valve 29 are installed on the manifold 23 to form an integrated valve and the manifold 23 distributes compressed gas; it can be understood that when there are two burners 2, the first solenoid valve 27, the second solenoid valve 29 and the regulating valve 35 and other corresponding components are also matched accordingly and connected to the electrical control system 7 by electrical signal, so that one burner 2 can be selected to work or both burners 2 can work at the same time through the electrical control system 7.

[0024] The regulating assembly includes a regulating valve 35 mounted on the third air supply pipe 36, used to regulate the amount of compressed gas delivered to the nozzle 15 via the third air supply pipe 36, thereby adjusting the fuel-air mixing ratio. In this embodiment, the regulating valve 35 is a manual valve, fixed to the frame 1, with the operating knob exposed. The output port of the first solenoid valve 27 is connected to one end of the first air supply pipe 28, and the output port of the second solenoid valve 29 is connected to the inlet of the pressure reducing valve 31 via the first relay pipe 30. The outlet of the pressure reducing valve 31 is connected to the second air supply pipe 32. The other end of the first air supply pipe 28 and the second air supply pipe 32 merge via a tee 33 and then connect to the inlet of the regulating valve 35 via the second relay pipe 34. The output of the regulating valve 35 is connected to the third air supply pipe 36. It is understood that this embodiment also includes a functional compartment space for installing the aforementioned air circuit components or oil circuit components of the conversion assembly, located beside the air compressor 6.

[0025] According to the structure provided in this embodiment, in the preheater provided in this application, upon startup, the electronic control system 7 first energizes and heats the igniter 37 for 10-20 seconds, preferably 15 seconds, to raise the silicon nitride ignition rod to a high-temperature state, i.e., a bright red appearance. This temperature is much higher than the ignition point of fuel. Then, the second solenoid valve 29 is energized and opened, and compressed air is delivered from the second solenoid valve 29 to the pressure reducing valve 31 (which is manually adjustable) via the first relay pipe 30. After pressure reduction, the compressed air is output to the second air supply pipe 32 via the regulating valve 35 to the third air supply pipe 36 (at this time, the opening of the regulating valve 35 on the third air supply pipe 36 is greater than that of the pressure reducing valve 31), i.e., low-pressure and low-volume air supply, so that the mixed fuel gas sprayed from the nozzle 1502 has a high concentration of fuel components, making it easier to ignite. The electronic control system 7 controls the second solenoid valve 39 to energize and open, and the compressed air is delivered from the second solenoid valve 29 via the first relay pipe 30 to the pressure reducing valve 31. Solenoid valve 29 is continuously energized for 3 to 10 seconds, preferably 5 seconds, and then de-energized (at which time combustion tube 18 has been preheated to a high temperature). Simultaneously, first solenoid valve 27 is energized and enters normal heating state. At this time, compressed gas output from the air compressor 6 storage tank is output through first solenoid valve 27 to first air supply pipe 28, and then directly supplied to third air supply pipe 36 through second relay pipe 34 and regulating valve 35. It has the characteristics of high pressure, large volume, and large volume. On the one hand, it has a better atomization effect on fuel, and on the other hand, it has more air, sufficient oxygen content, higher combustion efficiency, and large heat generation. Another significance of using compressed gas with depressurization treatment at the start is to avoid the flame being extinguished due to excessive gas volume at the start. After a period of preheating, undepressurized gas is introduced so that combustion tube 18 has been preheated to a high temperature, so that the combustion zone of fuel has sufficient heat to ignite the mixed fuel vapor mist.

[0026] After switching to normal heating mode, the gas volume can be slightly adjusted to the optimal combustion state by manually rotating the regulating valve 35 according to the flame color, which is convenient to operate.

[0027] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 13 The fully automatic dual-cavity quick-change and quick-install fuel-fired mold preheating machine also includes a switching component for switching the pressure in the main oil tank 5 between positive and negative states. The switching component includes a two-position five-way solenoid valve 25, a single-stage vacuum generator 24, and a pressurizing valve 22 controlled by the electronic control system 7. When both the pressurizing valve 22 and the two-position five-way valve 25 are energized, the compressed air output by the air compressor 6 is injected into the main oil tank 5 through the pressurizing valve 22 and the two-position five-way valve 25 via the connecting pipe 26 to make the main oil tank 5 positive pressure. When both the pressurizing valve 22 and the two-position five-way valve 25 are de-energized, the pressurizing valve 22 is closed, the compressed air output by the air compressor 6 enters the single-stage vacuum generator 24 through the two-position five-way valve 25, and the negative pressure generated by the single-stage vacuum generator 24 is connected to the connecting pipe 26 through the two-position five-way valve 25 to generate negative pressure in the main oil tank 5. The connecting pipe 26 is connected to the top of the main oil tank 5. In this embodiment, the two-position five-way valve 25 is a prior art two-position five-way solenoid valve. Its S port is connected to the compressed gas output by the air compressor 6 through an air pipe to an output port of the manifold 23; its B port is connected to the air inlet of the single-stage vacuum generator 24 through an air pipe; its P port is connected to the vacuum output port of the single-stage vacuum generator 24 through an air pipe; its R port is connected to the output port of the pressure valve 22 through an air pipe; its A port is connected to the connecting pipe 26; and the input port of the pressure valve 22 is connected to the main air pipe 21 through a tee.

[0028] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 13 The fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine also includes a one-way valve 45 and an oil suction pipe 4. A one-way valve 45 is installed on the top of the main oil tank 5 and flows unidirectionally towards the main oil tank 5; a suction pipe 4 is connected to the one-way valve 45 and extends out of the frame 1, used to draw external fuel into the main oil tank 5 when the pressure inside the main oil tank 5 is negative, thus effectively preventing air leakage when the pressure inside the main oil tank 5 is positive; in a further preferred embodiment, a pressure relief valve 44 and a pressure sensor 48 are also installed on the main oil tank 5 to ensure stable pressure inside the tank.

[0029] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 13 The fireproof plate 20 includes a horizontal plate portion 202, an inclined plate portion 203, and a straight plate portion 204, wherein: The horizontal plate portion 202 is connected to the outer circle of the combustion tube 18 and is parallel to the horizontal radial surface of the combustion tube 18. The longitudinal length of the horizontal plate portion 202 is adapted to the axial length of the combustion tube 18. The inclined plate portion 203 extends symmetrically and oppositely to both sides of the horizontal plate portion 202 along the outer end of the horizontal plate portion 202. The two inclined plate portions 203 located on the same side of the horizontal plate portion 202 have an included angle D = 55°~65°, preferably D = 60°. The straight plate portion 204 is connected to both ends of the inclined plate portion 203 and the horizontal plate portion 202, and is connected to the combustion tube 18. The inclined plate portion 203, the horizontal plate portion 202, the straight plate portion 204, and the combustion tube 18 together form two mutually opposite openings for covering. The mold cavities correspond to the two molds being heated; wherein, the edge of the straight plate portion 204 away from the holding tube 17 is lower than the edge of the inclined plate portion 203 to form a notch 201, which is used to discharge waste flame and prevent waste flame from being discharged toward the interface box 39, ensuring safe use; in this embodiment, the diameter of the flame hole 19 near the horizontal plate portion 202 is larger than the diameter of the flame hole 19 away from the horizontal plate portion 202, which is conducive to expanding the heating area, and the horizontal plate portion 202 is used to separate the two openings mentioned above to avoid cross-fire, thereby maintaining the uniformity of preheating of the mold, while the inclined plate portion 203, while expanding the heating area, also has the effect of reflecting heat to the mold being heated, further improving the heating efficiency.

[0030] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 13 The interface box 39 and the combustion tube 18 are connected to the holding tube 17 by quick-release clamps 46. This allows for quick installation and connection of the combustion tube 18. The significance of this is that when the size or shape of the mold being heated is different, it is convenient to replace the matching combustion tube 18 and its protective plate 20 to achieve a better heating effect.

[0031] For further preferred embodiments of this application, please refer to the accompanying drawings. Figures 1 to 13 The third air supply pipe 36, oil distribution pipe 10 and conductive wire 38 between the interface box 39 and the frame 1 are protected by a protective tube 3 to prevent damage to the third air supply pipe 36, oil distribution pipe 10 and conductive wire 38 when the burner 2 is moved, so as to ensure the reliability of the preheater of this application.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0035] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fully automatic dual-cavity quick-change and quick-install fuel-fired mold preheating machine, comprising an electrical control system (7), a frame (1) as a movable carrier, a main oil tank (5) installed inside the frame (1) for storing fuel oil, an air compressor (6) installed inside the frame (1) and located below the main oil tank (5), and a burner (2) disposed outside the frame (1) and movable relative to the frame (1), characterized in that, The burner (2) includes: The grip tube (17) has a hollow structure and flanges (49) are formed at both ends. The combustion tube (18) is detachably connected to the flange (49) at the outer end of the holding tube (17). A plurality of flame holes (19) are formed on the peripheral wall of the combustion tube (18). A fire guard plate (20) is provided around the combustion tube (18) to limit the flame ejected from the combustion tube (18) to a set area. Interface box (39), connected to the flange (49) at the other end of the grip tube (17); The nozzle (15) is installed inside the grip tube (17) and has a channel (1701) for air passage between the grip tube (17) and the outer wall of the nozzle (15). The nozzle (15) forms a coaxially connected mixing chamber (1501) and an ejection hole (1502). The combustion oil pipe (14) is connected to the mixing chamber (1501) at one end through the outer circular sidewall of the nozzle (15), and the opening of the combustion oil pipe (14) in the mixing chamber (1501) forms an injection port (1401). The other end of the combustion oil pipe (14) is used to receive fuel oil from the main oil tank (5) and pressurized by the air compressor (6) and atomized and injected into the mixing chamber (1501) through the injection port (1401). The third air supply pipe (36) is coaxially connected to the end of the mixing chamber (1501) away from the nozzle (1502), and is used to inject compressed gas from the air compressor (6) into the mixing chamber (1501) to mix with the atomized fuel to form a mixed gas mixture, which is then atomized again through the nozzle (1502) and injected into the combustion pipe (18). Igniter (37) is fixed side by side to the outside of the nozzle (15) and the front end of the igniter (37) is adapted to the position of the nozzle (1502) to ignite the mixed gas in the combustion tube (18); The fan (41) is located in the interface box (39) and is connected to the electrical control system (7) by electrical signal. It is started at a set time to supply air to the combustion tube (18) through the grip tube (17) to assist combustion and to form a cooling airflow between the grip tube (17), the nozzle (15) and the igniter (37).

2. The fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine according to claim 1, characterized in that: The interface box (39) is horizontally arranged with a partition (40) to divide the interface box (39) into a first cavity (3901) and a second cavity (3902). The first cavity (3901) is connected to the grip tube (17). The fan (41) is located in the second cavity (3902) and fixed on the partition (40). It blows air to the first cavity (3901) through the through hole formed on the partition (40). The combustion oil pipe (14), the third air supply pipe (36), and the conductive wire (38) of the igniter (37) all pass through the partition (40) and enter the second cavity (3902).

3. The fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine according to claim 2, characterized in that: The fan (41) is an axial flow fan, and at least two are installed in series axially. An air intake perforation (3903) is formed on the interface box (39).

4. The fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine according to claim 2, characterized in that, The burner (2) further includes: The small oil tank (12) is fixed inside the second cavity (3902) and has an oil inlet and an oil outlet. Both the oil inlet and the oil outlet are located on the bottom side wall of the small oil tank (12). The oil inlet is connected to the main oil tank (5) through the oil distribution pipe (10) and is used to introduce the pressurized fuel in the main oil tank (5) into the small oil tank (12). The oil outlet is connected to the combustion oil pipe (14). The top of the small oil tank (12) always maintains an air gap so that the fuel entering the combustion oil pipe (14) has a set pressure. The working oil valve (13) is located on the combustion oil pipe (14) and fixed inside the second cavity (3902) for controlling the small oil tank (12) to supply oil to the nozzle (15).

5. The fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine according to claim 4, characterized in that, Also includes: The main oil pipe (8) is connected to the bottom of the main oil tank (5) at one end and connected to the filter (9) at the other end. The end of the branch oil pipe (10) away from the small oil tank (12) is connected to the output end of the filter (9). The branch oil pipe (10) is also equipped with an oil supply valve (11) for cutting off or opening the branch oil pipe (10).

6. The fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine according to claim 4, characterized in that, It also includes a conversion component for switching the preheater between a start-up state and a normal operating state, and a regulating component for regulating the combustion state, the conversion component comprising: A first solenoid valve (27) and a second solenoid valve (29) are arranged side by side between the air compressor (6) and the third air supply pipe (36) and are controlled by the electronic control system (7) to be switched on and off according to a preset time sequence. A pressure reducing valve (31) is provided between the second solenoid valve (29) and the third air supply pipe (36). When the preheater is in the start-up state, the second solenoid valve (29) is energized for a preset time so that the compressed gas output by the air compressor (6) is reduced by the pressure reducing valve (31) and supplied to the third air supply pipe (36) to obtain an initial gas concentration that is easy to ignite. After the start-up is completed, the second solenoid valve (29) is de-energized and the first solenoid valve (27) is turned on so that the compressed gas output by the air compressor (6) is directly supplied to the third air supply pipe (36) to switch to normal working state. The regulating component includes a regulating valve (35) disposed on the third air supply pipe (36) for regulating the amount of compressed gas delivered to the nozzle (15) via the third air supply pipe (36) to regulate the fuel-air mixing ratio.

7. The fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine according to claim 4, characterized in that: It also includes a switching assembly for switching the pressure in the main oil tank (5) between positive and negative states. The switching assembly includes a two-position five-way solenoid valve (25), a single-stage vacuum generator (24), and a pressurizing valve (22), all controlled by the electronic control system (7). When both the pressurizing valve (22) and the two-position five-way valve (25) are energized, the compressed air output by the air compressor (6) is injected into the main oil tank (5) via the pressurizing valve (22) and the two-position five-way valve (25) through a connecting pipe (26) to allow the pressure in the main oil tank (5) to change between positive and negative states. When the main oil tank (5) becomes positively pressurized, and both the pressurizing valve (22) and the two-position five-way valve (25) are de-energized, the pressurizing valve (22) is shut off, and the compressed air output by the air compressor (6) enters the single-stage vacuum generator (24) through the two-position five-way valve (25). The negative pressure generated by the single-stage vacuum generator (24) is connected to the connecting pipe (26) through the two-position five-way valve (25) to generate negative pressure in the main oil tank (5). The connecting pipe (26) is connected to the top of the main oil tank (5).

8. The fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine according to claim 7, characterized in that, Also includes: A one-way valve (45) is installed on the top of the main oil tank (5) and flows unidirectionally toward the main oil tank (5); The suction pipe (4) is connected to the one-way valve (45) and extends out of the frame (1) to draw external fuel into the main oil tank (5) when the pressure inside the main oil tank (5) is negative.

9. The fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine according to claim 1, characterized in that, The fireproof plate (20) includes: The horizontal plate (202) is connected to the outer circle of the combustion tube (18) and is parallel to the horizontal radial surface of the combustion tube (18). The longitudinal length of the horizontal plate (202) is adapted to the axial length of the combustion tube (18). The inclined plate portion (203) extends symmetrically and obliquely away from each other along the outer end of the horizontal plate portion (202) and toward both sides of the horizontal plate portion (202), and the two inclined plate portions (203) located on the same side of the horizontal plate portion (202) have an included angle D = 55°~65°. The straight plate (204) is connected to both ends of the inclined plate (203) and the horizontal plate (202) and is connected to the combustion tube (18); the inclined plate (203), the horizontal plate (202), the straight plate (204) and the combustion tube (18) together form two mutually opposing open mouths to cover the mold cavities of the two molds to be heated; wherein, the edge of the straight plate (204) away from the holding tube (17) is lower than the edge of the inclined plate (203) to form a notch (201) for exhausting the exhaust flame.

10. The fully automatic dual-cavity quick-change and quick-installation fuel-fired mold preheating machine according to claim 1, characterized in that: The interface box (39) and the combustion tube (18) are both connected to the grip tube (17) via quick-release clamps (46).

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