A release agent preheating device

Abstract

The present invention discloses a release agent preheating device, comprising a metal die-casting machine, a spraying mechanism is installed on one side of the metal die-casting machine, the spraying mechanism comprises a connecting base, a spraying assembly is arranged on one side of the top of the connecting base, a shielding cover is arranged on the outer sleeve of the spraying assembly, drying and heating assemblies are respectively installed on both ends of the shielding cover, the spraying assembly comprises a heat exchanger, one end of the heat exchanger is connected to a liquid inlet pipe, and an electric-controlled nozzle is installed on the end of the heat exchanger away from the liquid inlet pipe. The present invention prolongs the heat exchange time between the room temperature release agent and the high-temperature hot air flow through the spiral tubular heat exchange tube structure in the heat exchanger, so that the release agent is preheated when the die-casting mold is subjected to hot air drying treatment. This design ensures that the release agent has reached a suitable temperature before being sprayed onto the mold surface, thereby improving the spraying effect and adhesion performance of the release agent. The preheating treatment of the release agent not only accelerates its curing process, but also reduces the possibility of the release agent falling off from the mold surface after spraying.

Description

Technical Field

[0001] The invention relates to the technical field of preheating treatment of a release agent, in particular to a preheating device for a release agent. Background Art

[0002] In the field of stamping and forming of metal casting, a release agent is a chemical substance or mixture specially used to form an isolation layer between the mold and the metal forming material. Its main function is to prevent the metal material from adhering to the mold surface during the stamping and forming process, thereby ensuring that the workpiece can be demolded smoothly, reducing the friction and wear between the mold and the workpiece, and avoiding damage to the mold and the finished product surface. The use of release agents can significantly improve production efficiency, extend the service life of the mold, and reduce the scrap rate. According to the specific metal material and processing technology, release agents can be divided into water-based, oil-based, semi-permanent and other types. Common release agent ingredients include silicone oil, wax, fatty acids and their derivatives, which can provide effective lubrication and isolation effects in metal stamping and forming processes.

[0003] When in use, the existing release agent preheating device is unable to effectively dehumidify and dry the stamping die before spraying the release agent, and also lacks the ability to timely high-temperature cure the stamping die that has been sprayed with the release agent, resulting in the release agent not adhering firmly during the spraying process, affecting the adhesion effect of the release agent to the mold surface. At the same time, the existing release agent preheating device is unable to prevent leakage and purify the hot air flow and harmful gases generated by the drying and heating during the air heating and circulating transportation process, further threatening the safety of the operating environment.

[0004] Based on this, we propose a release agent preheating device to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to provide a release agent preheating device to solve the problem that the preheating device of the existing metal casting stamping forming device mentioned in the above background technology cannot effectively dry the mold and cannot dry and solidify the release agent in time after spraying, thereby affecting the release agent adhesion effect and demolding efficiency and quality.

[0006] To achieve the above object, the present invention provides the following technical solutions: a release agent preheating device, comprising a metal die-casting machine, a spraying mechanism is installed on one side of the metal die-casting machine, the spraying mechanism comprises a connecting base, a spraying assembly is arranged on one side of the top of the connecting base, a shielding cover is arranged on the outside of the spraying assembly, and drying and heating assemblies are respectively installed at both ends of the shielding cover;

[0007] The spray assembly comprises a heat exchanger, one end of the heat exchanger is connected to a liquid inlet pipe, and an electric-controlled spray head is installed at the end of the heat exchanger away from the liquid inlet pipe;

[0008] A circulating air inlet pipe is connected to one side of the heat exchanger, a circulating air outlet pipe is arranged on the side of the heat exchanger away from the circulating air inlet pipe, a heat exchange pipe is connected inside the heat exchanger, the heat exchange pipe is connected through the infusion pipeline and the electric-controlled nozzle, a gas purification cylinder is connected to one end of the circulating air inlet pipe and the circulating air outlet pipe away from the heat exchanger, a tee pipe is arranged at one end of the two groups of gas purification cylinders, and a fluid regulating member is also arranged between the heat exchange pipe and the electric-controlled nozzle;

[0009] A conveying lathe is installed on one side of the metal die-casting machine. A collecting trough is provided at one end of the conveying lathe close to the spraying mechanism. A die-casting mold is also placed inside the conveying lathe.

[0010] Based on the above technical features, the release agent preheating device of the present invention is composed of a metal die-casting machine and a spraying mechanism. The spraying mechanism includes a connecting base, a spraying component, a shielding cover and a drying and heating component. The drying and heating component preheats the mold through a resistance heater, and at the same time performs hot air drying without dead ends through a blower and an exhaust fan. A heat exchanger is used to extend the heat exchange time between the release agent and the hot air flow to achieve preheating of the release agent. The fluid regulating part is linked to the electronically controlled nozzle. The temperature and fluidity of the release agent are ensured through adaptive control of the sensing device and the circulating pump. The secondary drying treatment enhances the adhesion of the release agent, and the volatile organic compounds are effectively purified through the gas purification cylinder to reduce environmental pollution.

[0011] Preferably, in the above-mentioned release agent preheating device, a circulation pump is installed at the bottom of the connecting base, the discharge port of the circulation pump is connected to the liquid inlet pipe, the suction port of the circulation pump is connected to the liquid extraction pipe, and the liquid extraction port of the liquid extraction pipe is located on the bottom side of the collecting tank.

[0012] Based on the above technical features, the circulation pump in this solution is connected to the liquid inlet pipe through its discharge port to transport the release agent to subsequent devices, such as heat exchange tubes or electronically controlled nozzles, to ensure that the release agent can be continuously and stably supplied and preheated. The suction port of the circulation pump is connected to the liquid extraction pipe, and the liquid extraction port of the liquid extraction pipe is located on the bottom side of the collection tank, so that the release agent spilled during the spraying process can be effectively recovered and transported back to the system for reuse through the circulation pump.

[0013] Preferably, in the above-mentioned release agent preheating device, the fluid regulating component includes a thermal expansion valve, and the outer sleeve of the thermal expansion valve is provided with a valve body limit frame.

[0014] Based on the above technical features, the valve body limit frame in this solution is used to support and protect the thermal expansion valve. It fixes the working position and movement range of the thermal expansion valve to prevent structural damage or performance failure due to excessive deformation under the action of thermal expansion.

[0015] Preferably, in the above-mentioned release agent preheating device, the thermal expansion valve includes a thermal expansion shell, the interior of the thermal expansion shell is connected with a guide valve stem, the guide valve stem is connected through the heat exchange tube and the electric control nozzle, a circular valve block is arranged in the middle of the guide valve stem, the circular valve block and the thermal expansion shell are in transition fit, and a plurality of groups of guide grooves distributed in a circular array are provided at both ends of the guide valve stem near the circular valve block.

[0016] Based on the above technical features, the thermal expansion valve in this scheme is composed of a thermal expansion shell, a guide valve stem, a circular valve block and a guide groove. When the hot air flow generated by drying and heating is transported to the interior of the heat exchanger, the hot air flow can heat the thermal expansion shell of the thermal expansion valve. The thermal expansion shell expands under the action of thermal expansion and contraction. The thermal expansion shell that originally transitionally cooperated with the circular valve block produces a gap due to thermal expansion. The release agent that has completed heat exchange can now flow normally to the interior of the electric control nozzle.

[0017] Preferably, in the above-mentioned release agent preheating device, the valve body limit frame includes a metal frame, and first induction switches are arranged on both sides of the inner wall of the metal frame, and the first induction switch is connected to the circulation pump via an electrical signal.

[0018] Based on the above technical features, when the heated thermal expansion shell expands due to the action of thermal expansion and contraction, the expanded thermal expansion shell is squeezed into contact with the first induction switches installed on both sides of the inner wall of the metal frame. The first induction switch adopts the push-type induction switch in the prior art. The push-type induction switch and the circulation pump are connected by electrical signals. When the first induction switch is squeezed by the thermal expansion shell, the circulation pump can be triggered to power on. After power-on, the circulation pump re-transports the release agent recovered in the collection tank to the heat exchange tube, thereby realizing the recycling of the release agent and avoiding waste. At the same time, the release agent is continuously provided to the electronically controlled nozzle.

[0019] Preferably, in the above-mentioned release agent preheating device, several groups of the guide grooves are rotatably connected to the inside thereof with guide vanes, a second induction switch is further provided between two groups of the guide vanes, and the second induction switch is connected to the electric-controlled nozzle via an electrical signal.

[0020] Based on the above technical features, the second induction switch in this solution is connected to the electric-controlled nozzle through an electrical signal. When the induction switch detects the rotation state of the guide impeller, the signal is transmitted to the equipment controller. The equipment controller determines the flow condition of the release agent based on the received signal, thereby automatically controlling the opening or closing of the electric-controlled nozzle. This control method ensures that the electric-controlled nozzle sprays the release agent only when the release agent flows normally, thereby preventing the spraying effect from being affected by insufficient or poor flow of the release agent.

[0021] Preferably, in the above-mentioned release agent preheating device, the two groups of drying and heating components have the same structure, and the drying and heating components include a metal heat insulation cover, a blower is installed at one end of the outside of the metal heat insulation cover, and the air inlet of the blower is connected to a first air supply branch pipe, and the first air supply branch pipe is connected to the circulating air outlet pipe.

[0022] Based on the above technical features, this solution can transport the hot air blown out by the blower through the circulating air outlet pipe to the inside of the heat exchanger through the first air supply branch pipe. This connection design ensures that the heated air can be effectively transported from the drying and heating component to the inside of the heat exchanger for heat exchange, thereby improving the heat exchange efficiency of the release agent.

[0023] Preferably, in the above-mentioned release agent preheating device, an exhaust fan is provided at the external end of the metal heat insulation cover away from the blower, the negative pressure generated by the exhaust fan is greater than the positive pressure generated by the blower, and a second air supply branch pipe is installed at the air outlet of the exhaust fan, and the second air supply branch pipe is connected to the circulating air inlet pipe.

[0024] Based on the above technical features, this solution forms a closed-loop airflow system by connecting the air outlet of the vacuum fan to the second air supply branch and to the circulating air intake pipe. This structural design allows the hot air to be effectively extracted by the vacuum fan when passing through the drying and heating component, and then returned to other parts of the system through the second air supply branch and the circulating air intake pipe, forming a continuous air circulation and improving the heat exchange efficiency of the release agent.

[0025] Preferably, in the above-mentioned release agent preheating device, windshields are provided on both sides of the through grooves of the metal heat insulation cover and the shielding cover, a two-way rebound hinge is installed between the windshield and the shielding cover, and a resistance heater is also arranged in the inner cavity of the metal heat insulation cover.

[0026] Based on the above technical features, the resistance heater in this solution is arranged in the inner cavity of the metal heat insulation cover, which can generate stable heat for heating the air passing through the metal heat insulation cover. The efficient heating performance of the resistance heater ensures uniform heating of the hot air, thereby improving the preheating effect of the die-casting mold and ensuring uniform coating and curing of the release agent.

[0027] Preferably, in the above-mentioned release agent preheating device, the gas purification cylinder includes a connecting outer shell, a sealed inner shell is connected between two groups of the connecting outer shells, and the interior of the sealed inner shell is also filled with a filter element.

[0028] Based on the above technical features, this solution is achieved by installing a gas purification cartridge at one end of the circulating air inlet pipe and the circulating air outlet pipe. Both sets of gas purification cartridges are composed of a connected outer shell, a sealed inner shell and a filter element. The filter element in this solution adopts high-strength activated carbon fiber in the prior art, which has a high specific surface area, porosity, high mechanical strength and adsorption capacity, and has a strong adsorption effect on volatile organic compounds. When the heated air circulates between the heat exchanger and the inside of the two sets of drying and heating components, the gas purification cartridge can adsorb and purify the volatile organic compounds contained in the heated air, thereby avoiding the volatile organic compounds generated by the drying and heating of the release agent from affecting the air environment and the health of the staff.

[0029] The present invention provides a release agent preheating device, which has the following technical points and beneficial effects:

[0030] 1. The release agent preheating device designed in the present invention can effectively preheat the die-casting mold by installing two sets of drying and heating components on the top of the conveying lathe. This design not only uses the resistance heater to evenly dry and heat the mold surface, but also through the cooperation of the blower and the exhaust fan, the hot air is blown on the mold surface without dead ends. In this process, the negative pressure generated by the exhaust fan is greater than the positive pressure generated by the blower, which avoids the overflow of the hot air flow. At the same time, the hot air flow is circulated and transported to the inside of the heat exchanger. This hot air flow circulation treatment system ensures the full utilization of the heated air, makes the mold preheating uniform and energy-saving and efficient, and creates ideal conditions for the subsequent preheating and spraying of the release agent.

[0031] 2. The present invention prolongs the heat exchange time between the room temperature release agent and the high temperature hot air flow through the spiral tubular heat exchange tube structure in the heat exchanger, so that the release agent is preheated when the die-casting mold is subjected to hot air drying treatment. This design ensures that the release agent has reached a suitable temperature before being sprayed onto the mold surface, thereby improving the spraying effect and adhesion performance of the release agent. The preheating treatment of the release agent not only accelerates its curing process, but also reduces the possibility of the release agent falling off the mold surface after spraying. In addition, the built-in circulation pump and the electronically controlled nozzle of the device cooperate with the sensing device through intelligent control to achieve adaptive adjustment according to the flow state and temperature of the release agent. The equipment controller can monitor the rotation state of the guide impeller in real time to ensure that the flow rate and temperature of the release agent are always in the optimal range, thereby further improving the utilization efficiency and spraying effect of the release agent.

[0032] 3. The present invention solves the environmental pollution problem during the heating process of the release agent through the innovatively designed gas purification cylinder. Although the environmentally friendly release agent may still produce a small amount of volatile organic compounds at high temperatures, these harmful gases are effectively collected and recycled through the negative pressure control of the vacuum pump. The high-strength activated carbon fiber filter element used in the purification cylinder has a high adsorption capacity and can effectively purify the volatile organic compounds. In addition, through the adaptive control system of the circulating pump and the electronically controlled nozzle, when the release agent does not flow enough or the temperature is not enough, the device will automatically stop the spraying operation, avoiding the poor demolding effect caused by insufficient release agent or insufficient temperature, thereby improving the practicality of the device in the field of release agent preheating technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 It is a schematic diagram of the disassembly of the spraying mechanism in the present invention;

[0035] Figure 3 It is a schematic diagram of the structure of the spray assembly in the present invention;

[0036] Figure 4 It is a schematic diagram of the heat exchanger structure in the present invention;

[0037] Figure 5 It is a schematic diagram of the structure of the conveying lathe in the present invention;

[0038] Figure 6 It is a schematic diagram of the structure of the fluid regulating member in the present invention;

[0039] Figure 7 It is a schematic diagram of the disassembly of the thermal expansion valve in the present invention;

[0040] Figure 8 It is a schematic diagram of the disassembly of the valve body limit frame in the present invention;

[0041] Fig. 9 It is a plane schematic diagram of the guide groove in the present invention;

[0042] Fig.10 It is a front view schematic diagram of the metal heat shield in the present invention;

[0043] Fig.11 It is a schematic diagram of the reverse side of the metal heat shield in the present invention;

[0044] Fig.12 It is a schematic diagram of the disassembly of the gas purification cartridge in the present invention.

[0045] In the figure:

[0046] 1. Metal die-casting machine;

[0047] 2. Spraying mechanism;

[0048] 21. Connecting base; 211. Circulating pump; 212. Liquid extraction pipeline;

[0049] 22. Spraying assembly;

[0050] 221, heat exchanger; 2211, circulating air inlet pipe; 2212, circulating air outlet pipe; 2213, heat exchange pipe;

[0051] 2214, gas purification cartridge; 22141, connected outer shell; 22142, sealed inner shell; 22143, filter element;

[0052] 2215, tee pipe;

[0053] 222, liquid inlet pipeline; 223, electronically controlled nozzle;

[0054] 23. Shielding cover;

[0055] 24. Drying and heating assembly; 241. Metal heat shield; 242. Blower; 243. First air supply branch pipe; 244. Air extractor; 245. Second air supply branch pipe; 246. Wind shield; 247. Two-way rebound hinge; 248. Resistance heater;

[0056] 3. Fluid regulating parts;

[0057] 31. thermal expansion valve; 311. thermal expansion housing; 312. guide valve stem; 313. round valve block;

[0058] 314, guide groove; 3141, guide vane; 3142, second induction switch;

[0059] 32. Valve body limit frame; 321. Metal frame; 322. First induction switch;

[0060] 4. Conveying lathe; 5. Collecting tank; 6. Die-casting mold. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0062] See also Figures 1 to 7 The present invention provides a technical solution of a release agent preheating device:

[0063] A release agent preheating device includes a metal die-casting machine 1, a conveying lathe 4 is installed on one side of the metal die-casting machine 1, a collecting tank 5 is opened at one end of the conveying lathe 4 close to a spraying mechanism 2, a die-casting mold 6 is also placed inside the conveying lathe 4, a spraying mechanism 2 is installed on one side of the metal die-casting machine 1, the spraying mechanism 2 includes a connecting base 21, a spraying assembly 22 is arranged on one side of the top of the connecting base 21, a shielding cover 23 is arranged on the outside of the spraying assembly 22, and drying and heating assemblies 24 are respectively installed at both ends of the shielding cover 23, and the spraying assembly 22 includes a heat exchanger 221, one end of the heat exchanger 221 is connected to a liquid inlet pipe 222, and the heat exchanger 221 is far away from the liquid inlet pipe 22. 2 is provided with an electric-controlled nozzle 223, one end of the heat exchanger 221 is connected with a circulating air inlet pipe 2211, a circulating air outlet pipe 2212 is provided on the side of the heat exchanger 221 away from the circulating air inlet pipe 2211, a heat exchange pipe 2213 is connected inside the heat exchanger 221, the heat exchange pipe 2213 is connected through and connected between the liquid inlet pipe 222 and the electric-controlled nozzle 223, the circulating air inlet pipe 2211 and the circulating air outlet pipe 2212 are connected with a gas purification cartridge 2214 at one end away from the heat exchanger 221, a three-way pipe 2215 is provided at one end of the two groups of gas purification cartridges 2214, and a fluid regulating member 3 is also provided between the heat exchange pipe 2213 and the electric-controlled nozzle 223.

[0064] The fluid regulating member 3 includes a thermal expansion valve 31, the outer sleeve of the thermal expansion valve 31 is provided with a valve body limit frame 32, the thermal expansion valve 31 includes a thermal expansion shell 311, the interior of the thermal expansion shell 311 is connected with a guide valve stem 312, the guide valve stem 312 is connected between the heat exchange tube 2213 and the electric control nozzle 223, the middle of the guide valve stem 312 is provided with a circular valve block 313, the circular valve block 313 and the thermal expansion shell 311 are transitionally matched, and the guide valve stem 312 is provided with a plurality of groups of guide valves distributed in a circumferential array at both ends of the circular valve block 313. The thermal expansion valve 31 is composed of a thermal expansion shell 311, a guide valve stem 312, a circular valve block 313 and a guide groove 314. When the hot air flow generated by drying and heating is transported to the interior of the heat exchanger 221, the hot air flow can heat the thermal expansion shell 311 of the thermal expansion valve 31. The thermal expansion shell 311 expands under the action of thermal expansion and contraction. The thermal expansion shell 311, which was originally transitionally matched with the circular valve block 313, has a gap due to thermal expansion. The release agent that has completed heat exchange can now flow normally to the interior of the electronically controlled nozzle 223.

[0065] The valve body limit frame 32 includes a metal frame 321, and first induction switches 322 are arranged on both sides of the inner wall of the metal frame 321. The first induction switch 322 is connected to the circulation pump 211 by electrical signals. When the heated thermal expansion shell 311 expands under the action of thermal expansion and contraction, the expanded thermal expansion shell 311 is squeezed and contacted with the first induction switches 322 respectively installed on both sides of the inner wall of the metal frame 321. The first induction switch 322 adopts a push-type induction switch in the prior art. The push-type induction switch is connected to the circulation pump 211 by electrical signals. When the first induction switch 322 is squeezed by the thermal expansion shell 311, the circulation pump 211 can be triggered to power on. The circulation pump 211 after powering on re-transports the release agent recovered in the collection tank 5 to the heat exchange pipe 2213, thereby realizing the recycling of the release agent and avoiding waste. At the same time, the release agent is continuously provided to the electric-controlled nozzle 223.

[0066] During operation, when the hot air flow generated by drying and heating is transported to the interior of the heat exchanger 221, the heat expansion shell 311 of the heat expansion valve 31 can be heated. The heat expansion shell 311 expands under the action of thermal expansion and contraction. The heat expansion shell 311 that originally transitionally matches with the circular valve block 313 generates a gap due to thermal expansion. The release agent that has completed the heat exchange can now flow normally to the interior of the electronically controlled nozzle 223. When the heated heat expansion shell 311 expands under the action of thermal expansion and contraction, the expanded heat expansion shell 311 and the inner wall of the metal frame 321 are The first induction switches 322 installed on the sides are squeezed and contacted. The first induction switch 322 in the present solution adopts the push-type induction switch in the prior art. The push-type induction switch is connected to the circulation pump 211 by an electrical signal. When the first induction switch 322 is squeezed by the thermal expansion shell 311, the circulation pump 211 can be triggered to power on. The energized circulation pump 211 re-transports the release agent recovered in the collection tank 5 to the heat exchange tube 2213, thereby realizing the recycling of the release agent and avoiding waste. At the same time, the release agent is continuously provided to the electric-controlled nozzle 223.

[0067] As an embodiment of the present invention, Figures 3 to 9 As shown, several groups of guide grooves 314 are rotatably connected inside with guide impellers 3141, and a second induction switch 3142 is further arranged between two groups of guide impellers 3141. The second induction switch 3142 is connected to the electric-controlled nozzle 223 via an electrical signal. The second induction switch 3142 is connected to the electric-controlled nozzle 223 via an electrical signal. When the induction switch detects the rotation state of the guide impeller 3141, the signal is transmitted to the device controller. The device controller determines the flow condition of the release agent according to the received signal, thereby automatically controlling the opening or closing of the electric-controlled nozzle 223. This control method ensures that the electric-controlled nozzle 223 sprays the release agent only when the release agent flows normally, thereby preventing the spraying effect from being affected by insufficient or poor flow of the release agent.

[0068] A circulation pump 211 is installed at the bottom of the connecting base 21 , the discharge port of the circulation pump 211 is connected to the liquid inlet pipe 222 , the suction port of the circulation pump 211 is connected to the liquid extraction pipe 212 , and the liquid extraction port of the liquid extraction pipe 212 is located at one side of the bottom of the collecting tank 5 .

[0069] When working, the circulation pump 211 is connected to the liquid inlet pipe 222 through its discharge port to transport the release agent to subsequent devices, such as the heat exchange tube 2213 or the electronically controlled nozzle 223, to ensure that the release agent can be continuously and stably supplied and preheated. The suction port of the circulation pump 211 is connected to the liquid extraction pipe 212, and the liquid extraction port of the liquid extraction pipe 212 is located on the bottom side of the collection tank 5, so that the release agent spilled during the spraying process can be effectively recovered and transported back to the system through the circulation pump 211 for reuse.

[0070] As an embodiment of the present invention, Figure 10 to Figure 11 As shown, the two groups of drying and heating components 24 have the same structure. The drying and heating components 24 include a metal heat insulation cover 241. A blower 242 is installed at one end of the outside of the metal heat insulation cover 241. The air inlet of the blower 242 is connected to a first air supply branch pipe 243. The first air supply branch pipe 243 is connected to a circulating air outlet pipe 2212. The hot air blown out by the blower 242 can be transported to the inside of the heat exchanger 221 through the circulating air outlet pipe 2212 through the first air supply branch pipe 243. This connection design ensures that the heated air can be effectively transported from the drying and heating components 24 to the inside of the heat exchanger 221 for heat exchange, thereby improving the heat exchange efficiency of the release agent.

[0071] An exhaust fan 244 is provided at the outer end of the metal heat insulation cover 241 away from the blower 242. The negative pressure generated by the exhaust fan 244 is greater than the positive pressure generated by the blower 242. A second air supply branch pipe 245 is installed at the air outlet of the exhaust fan 244, and the second air supply branch pipe 245 is connected to the circulating air inlet pipe 2211.

[0072] During operation, by connecting the air outlet of the vacuum fan 244 to the second air supply branch 245 and to the circulating air inlet pipe 2211, this structural design forms a closed-loop air flow system. When the hot air passes through the drying and heating component 24, it will be effectively extracted by the vacuum fan 244, and then returned to other parts of the system through the second air supply branch 245 and the circulating air inlet pipe 2211, forming a continuous air circulation, thereby improving the heat exchange efficiency of the release agent.

[0073] As an embodiment of the present invention, Figure 11 to Figure 12As shown, windshield plates 246 are provided on both sides of the through grooves of the metal heat insulation cover 241 and the shielding cover 23, and a two-way rebound hinge 247 is installed between the windshield plate 246 and the shielding cover 23. The inner cavity of the metal heat insulation cover 241 is also provided with a resistance heater 248. The resistance heater 248 is arranged in the inner cavity of the metal heat insulation cover 241 and can generate stable heat for heating the air passing through the metal heat insulation cover 241. The efficient heating performance of the resistance heater 248 ensures uniform heating of the hot air, thereby improving the preheating effect of the die-casting mold 6 and ensuring uniform coating and curing of the release agent.

[0074] The gas purification cartridge 2214 includes a connected outer shell 22141 , and a sealed inner shell 22142 is connected between two sets of connected outer shells 22141 . The interior of the sealed inner shell 22142 is also filled with a filter element 22143 .

[0075] During operation, a gas purification cartridge 2214 is installed at one end of the circulating air inlet pipe 2211 and the circulating air outlet pipe 2212. Both groups of gas purification cartridges 2214 are composed of a connected outer shell 22141, a sealed inner shell 22142 and a filter element 22143. The filter element 22143 in this scheme adopts high-strength activated carbon fiber in the prior art, which has high specific surface area, porosity, high mechanical strength and adsorption capacity, and has a strong adsorption effect on volatile organic compounds. When the heated air circulates between the heat exchanger 221 and the inside of the two groups of drying and heating components 24, the gas purification cartridge 2214 can adsorb and purify the volatile organic compounds contained in the heated air, so as to avoid the volatile organic compounds generated by the drying and heating of the release agent from affecting the air environment and the health of the staff.

[0076] Working principle: The release agent preheating device designed by the present invention is composed of a metal die-casting machine 1 and a spraying mechanism 2, wherein the spraying mechanism 2 comprises a connecting base 21, a spraying assembly 22, a shielding cover 23 and a drying and heating assembly 24. When the die-casting mold 6 is transported to the direction of the metal die-casting machine 1 through the conveying lathe 4, the mold is preheated by two sets of drying and heating assemblies 24 installed on the top of the conveying lathe 4. The two sets of drying and heating assemblies 24 have the same structure, and are composed of a metal heat insulation cover 241, a blower 242, a first air supply branch pipe 243, an exhaust fan 244, a second air supply branch pipe 245, a wind shield 246, The two-way rebound hinge 247 and the resistance heater 248 are composed. When the resistance heater 248 is powered on, the outer surface of the die-casting mold 6 to be sprayed with the release agent can be dried and heated. When the blower 242 and the exhaust fan 244 are powered on, the heated air can be blown to achieve hot air drying without dead angles on the outer surface of the die-casting mold 6. In addition, the negative pressure generated by the exhaust fan 244 is greater than the positive pressure generated by the blower 242, which not only avoids the overflow of the hot air flow, but also can circulate the hot air flow to the inside of the heat exchanger 221 through the first air supply branch pipe 243 and the second air supply branch pipe 245.

[0077] The heat exchanger 221 in the present invention is composed of a circulating air inlet pipe 2211, a circulating air outlet pipe 2212, a heat exchange pipe 2213, a gas purification cylinder 2214, a three-way pipe 2215 and a fluid regulating member 3. The first air supply branch pipe 243 is connected to the circulating air outlet pipe 2212, and the second air supply branch pipe 245 is connected to the circulating air inlet pipe 2211. The heated air inside the two groups of drying and heating components 24 can be transported to the inside of the heat exchanger 221, and the circulation of the heated air between the heat exchanger 221 and the two groups of drying and heating components 24 is also realized. When the hot air flow generated by drying and heating is transported to the inside of the heat exchanger 221, the room temperature release agent in the heat exchange pipe 2213 can be heat exchanged with the high temperature hot air flow. The heat exchange pipe 2213 is a spiral tubular structure design, which effectively prolongs the heat exchange time between the room temperature release agent and the high temperature hot air flow, so that the release agent is preheated while the die casting mold 6 is being hot-blown and dried.

[0078] In this solution, a fluid regulating member 3 is installed between the heat exchange tube 2213 and the electric control nozzle 223. The fluid regulating member 3 includes a thermal expansion valve 31 and a valve body limit frame 32. When the hot air flow generated by drying and heating is transported to the inside of the heat exchanger 221, the thermal expansion shell 311 of the thermal expansion valve 31 can be heated. The thermal expansion shell 311 expands under the action of thermal expansion and contraction. The thermal expansion shell 311, which was originally transitionally matched with the circular valve block 313, has a gap due to thermal expansion. The release agent that has completed the heat exchange can now flow normally to the inside of the electric control nozzle 223. When the heated thermal expansion shell 311 expands under the action of thermal expansion and contraction, a gap is generated in the thermal expansion shell 311. When expanding, the expanded heat expansion shell 311 and the first induction switches 322 respectively installed on both sides of the inner wall of the metal frame 321 are squeezed and contacted. The first induction switch 322 in this solution adopts a push-type induction switch in the prior art. The push-type induction switch and the circulation pump 211 are connected by electrical signals. When the first induction switch 322 is squeezed by the heat expansion shell 311, the circulation pump 211 can be triggered to be powered on. The circulating pump 211 after being powered on re-transports the release agent recovered in the collection tank 5 to the heat exchange pipe 2213, thereby realizing the recycling of the release agent and avoiding waste. At the same time, the release agent is continuously provided to the electric control nozzle 223.

[0079] When the heat expansion shell 311 expands under the action of thermal expansion and contraction, the demoulding agent that completes the heat exchange can flow to the inside of the electric control nozzle 223 through the guide groove 314. When the demoulding agent passes through the guide groove 314 opened around the two ends of the guide valve stem 312, the flow of the demoulding agent will drive the guide impeller 3141 rotatably connected inside the guide groove 314 to rotate. Since the guide impeller 3141 and the second induction switch 3142 are connected by transmission, the guide impeller 3141 in the rotating state can drive the second induction switch 3142 to rotate synchronously. The second induction switch 3142 in this solution adopts the Hall effect sensor in the prior art. The Hall effect sensor generates an electrical signal by detecting the rotation or static state of the guide impeller 3141, and transmits the electrical signal to the device controller. The device controller adopts the PLC or microcontroller in the prior art. When the device controller receives the guide impeller 3141 After receiving the rotation or stationary state signal of 41, the signal is first filtered and amplified, and then the analog signal is converted into a digital signal through an analog-to-digital converter. The device controller analyzes and judges the signal according to a preset threshold value, thereby determining the rotation or stationary state of the guide vane 3141. Since the second induction switch 3142 and the electric-controlled nozzle 223 are connected by an electrical signal, when the device controller determines that the guide vane 3141 is in a rotating state, it indicates that the release agent in the heat exchange tube 2213 has flowed into the electric-controlled nozzle 223. At this time, the device controller controls the electric-controlled nozzle 223 to be powered on, and the nozzle sprays the release agent after internal heating treatment onto the surface of the die-casting mold 6. Similarly, when the device controller determines that the guide vane 3141 is in a stationary state, the device controller controls the electric-controlled nozzle 223 to be powered off and stop spraying the release agent to avoid affecting the demolding effect due to insufficient release agent or insufficient temperature.

[0080] When the release agent is sprayed onto the surface of the die-casting mold 6 through the electronically controlled nozzle 223, the drying and heating component 24 installed on the top of one end of the conveying lathe 4 close to the metal die-casting machine 1 performs secondary drying and heating treatment on the mold. By performing secondary drying and heating treatment on the die-casting mold 6 sprayed with the release agent, not only the curing process of the release agent can be accelerated, but also the release agent can be more quickly combined with the surface of the die-casting mold 6 to improve the adhesion of the release agent and reduce the possibility of the release agent falling off from the surface of the die-casting mold 6. In addition, by secondary drying and heating the surface of the die-casting mold 6, the residual moisture and the poor release agent layer on the surface of the die-casting mold 6 can be reduced to a certain extent, and the corrosion and wear on the surface of the die-casting mold 6 can also be reduced, thereby extending the service life of the die-casting mold 6.

[0081] The release agent in this solution adopts an environmentally friendly release agent. When the drying and heating component 24 performs a secondary drying and heating treatment on the die-casting mold 6 sprayed with the release agent, although the environmentally friendly release agent heated at a high temperature will still produce a small amount of harmful gases, such as volatile organic compounds, the negative pressure generated by the exhaust fan 244 is greater than the positive pressure generated by the blower 242, which can prevent the harmful gases in the hot air from overflowing while circulating the heated air. The gas purification cartridge 2214 installed at one end of the circulating air inlet pipe 2211 and the circulating air outlet pipe 2212, the two sets of gas purification cartridges 2214 are connected by the outer shell 22141, It is composed of a sealed inner shell 22142 and a filter element 22143. The filter element 22143 in this scheme adopts high-strength activated carbon fiber in the prior art, which has high specific surface area, porosity, high mechanical strength and adsorption capacity, and has a strong adsorption effect on volatile organic compounds. When the heated air circulates between the heat exchanger 221 and the inside of the two groups of drying and heating components 24, the gas purification cylinder 2214 can adsorb and purify the volatile organic compounds contained in the heated air, so as to avoid the volatile organic compounds generated by the drying and heating of the release agent from affecting the air environment and the health of the staff.

[0082] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A release agent preheating device, comprising a metal die-casting machine (1), characterized in that: A spray mechanism (2) is installed on one side of the metal die-casting machine (1), the spray mechanism (2) comprises a connection base (21), a spray assembly (22) is arranged on one side of the top of the connection base (21), a shielding cover (23) is arranged on the outside of the spray assembly (22), and drying and heating assemblies (24) are respectively installed at both ends of the shielding cover (23); The spray assembly (22) comprises a heat exchanger (221), one end of the heat exchanger (221) is connected to a liquid inlet pipe (222), and an electric-controlled spray head (223) is installed at one end of the heat exchanger (221) away from the liquid inlet pipe (222); A circulating air inlet pipe (2211) is connected to one side of the heat exchanger (221); a circulating air outlet pipe (2212) is provided on the side of the heat exchanger (221) away from the circulating air inlet pipe (2211); a heat exchange pipe (2213) is connected inside the heat exchanger (221); the heat exchange pipe (2213) is connected between the liquid inlet pipe (222) and the electric-controlled nozzle (223); a gas purification cylinder (2214) is connected to one end of the circulating air inlet pipe (2211) and the circulating air outlet pipe (2212) away from the heat exchanger (221); a three-way pipe (2215) is provided at one end of the two groups of gas purification cylinders (2214); and a fluid regulating member (3) is further provided between the heat exchange pipe (2213) and the electric-controlled nozzle (223); The fluid regulating component (3) comprises a thermal expansion valve (31), the outer portion of the thermal expansion valve (31) is provided with a valve body limiting frame (32), the thermal expansion valve (31) comprises a thermal expansion shell (311), the interior of the thermal expansion shell (311) is connected with a guide valve stem (312), the guide valve stem (312) penetrates and is connected between the heat exchange tube (2213) and the electric control nozzle (223), a circular valve block (313) is provided in the middle of the guide valve stem (312), the circular valve block (313) and the thermal expansion shell (311) are in transitional fit, and a plurality of groups of guide grooves (314) distributed in a circumferential array are provided at both ends of the guide valve stem (312) close to the circular valve block (313); The two groups of drying and heating components (24) have the same structure. The drying and heating components (24) include a metal heat insulation cover (241). A blower (242) is installed at one end outside the metal heat insulation cover (241). The air inlet of the blower (242) is connected to a first air supply branch pipe (243). The first air supply branch pipe (243) is connected to a circulating air outlet pipe (2212). An exhaust fan (244) is provided at one end of the metal heat insulation cover (241) away from the blower (242). The negative pressure generated by the exhaust fan (244) is greater than the positive pressure generated by the blower (242). A second air supply branch pipe (245) is installed at the air outlet of the exhaust fan (244). The second air supply branch pipe (245) is connected to the circulating air inlet pipe (2211). A conveying lathe (4) is installed on one side of the metal die-casting machine (1); a collecting trough (5) is provided at one end of the conveying lathe (4) close to the spraying mechanism (2); and a die-casting mold (6) is also placed inside the conveying lathe (4).

2. A release agent preheating device according to claim 1, characterized in that: A circulation pump (211) is installed at the bottom of the connection base (21); the discharge port of the circulation pump (211) is connected to a liquid inlet pipe (222); the suction port of the circulation pump (211) is connected to a liquid extraction pipe (212); and the liquid extraction port of the liquid extraction pipe (212) is located at one side of the bottom of the collection tank (5).

3. A release agent preheating device according to claim 1, characterized in that: The valve body limiting frame (32) comprises a metal frame (321), and first induction switches (322) are provided on both sides of the inner wall of the metal frame (321), and the first induction switch (322) is connected to the circulation pump (211) via an electrical signal.

4. A release agent preheating device according to claim 1, characterized in that: A plurality of groups of guide grooves (314) are rotatably connected inside with guide vanes (3141), and a second induction switch (3142) is provided between two groups of guide vanes (3141). The second induction switch (3142) is connected to the electric-controlled nozzle (223) via an electrical signal.

5. A release agent preheating device according to claim 1, characterized in that: Wind shields (246) are provided on both sides of the through slots of the metal heat shield (241) and the shielding cover (23); a two-way rebound hinge (247) is installed between the wind shield (246) and the shielding cover (23); and a resistance heater (248) is also arranged in the inner cavity of the metal heat shield (241).

6. A release agent preheating device according to claim 1, characterized in that: The gas purification cartridge (2214) comprises a connected outer shell (22141), a sealed inner shell (22142) is connected between two groups of the connected outer shells (22141), and the interior of the sealed inner shell (22142) is also filled with a filter element (22143).

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