Full-automatic mold preheater

Abstract

The utility model belongs to the field of mold preheating, and provides a full-automatic mold preheating machine which comprises a flame nozzle, an oil tank, an oil conveying pipe, an air compressor, a main air pipe, a negative pressure generator, a negative pressure pipe, a first electromagnetic valve, an oil suction pipe and a control panel. The oil conveying pipe communicates with the oil tank and the flame nozzle; one end of the main air pipe is communicated with the air compressor, and the other end of the main air pipe forms a first branch air pipe and a second branch air pipe which are connected in parallel; an air inlet and an air outlet which are coaxially arranged are formed in the negative pressure generator, a bypass opening communicated with an air channel between the air inlet and the air outlet is further formed, the air inlet is further communicated with the second branch air pipe, and the air outlet is communicated with the external atmosphere; the negative-pressure pipe communicates with the top of the oil tank and the bypass opening. The first electromagnetic valve is mounted on the second branch air pipe; the other end of the oil suction pipe is a free end; the control panel is in communication connection with the air compressor and the first electromagnetic valve.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of mold preheating, and particularly relates to a full-automatic mold preheating machine. BACKGROUND

[0002] Molds are widely used in industrial production, especially in the fields of plastic molding and metal die casting. Before use, molds need to be preheated to avoid damage to the molds or product quality problems caused by sudden temperature changes. With the continuous development of industrial automation, higher requirements are put forward for the automation degree of mold preheating equipment. The existing preheating equipment has obvious deficiencies in automation, such as lack of intelligent control system, inability to accurately adjust fuel supply and air flow, and inability to monitor the fuel level in the oil tank in real time. These problems not only limit the production efficiency of the preheating equipment, but also increase the operation difficulty and safety hazards. Therefore, it is necessary to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiment of the application is to provide a full-automatic mold preheating machine to solve the technical problem of low automation degree of mold preheating equipment in the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the application is to provide a full-automatic mold preheating machine, comprising:

[0005] a flame jet head;

[0006] an oil tank for storing fuel;

[0007] an oil delivery pipe connecting the oil tank and the flame jet head;

[0008] an air compressor for generating compressed air;

[0009] a main air pipe having one end connected to the air compressor and the other end forming a first branch air pipe and a second branch air pipe in parallel, the first branch air pipe being connected to the flame jet head and used for atomizing fuel from the oil delivery pipe;

[0010] a negative pressure generator forming a gas inlet and a gas outlet arranged coaxially, and further forming a bypass port connected to the gas passage between the gas inlet and the gas outlet, the gas inlet being further connected to the second branch air pipe, and the gas outlet being connected to the external atmosphere;

[0011] a negative pressure pipe connecting the top of the oil tank and the bypass port;

[0012] a first electromagnetic valve installed on the second branch air pipe and used for controlling the opening and closing of the second branch air pipe;

[0013] an oil suction pipe having one end connected to the oil tank and the other end being a free end and used for connecting an external oil storage device;

[0014] The control panel is communicatively connected to both the air compressor and the first solenoid valve.

[0015] Optionally, the fully automatic mold preheating machine further includes a main oil pipe, a tee, a second solenoid valve, and a regulating valve, wherein the second solenoid valve and the regulating valve are respectively communicatively connected to the control panel;

[0016] One end of the main oil pipe is connected to the oil tank, and the other end forms a first oil supply branch pipe and a second oil supply branch pipe connected in parallel. The first oil supply branch pipe, the second oil supply branch pipe and the end of the oil delivery pipe away from the flame nozzle are respectively connected through the tee. The second solenoid valve is installed on the first oil supply branch pipe and is used to control the opening and closing of the first oil supply branch pipe. The regulating valve is installed on the second oil supply branch pipe and is used to regulate the opening degree of the second oil supply branch pipe.

[0017] Optionally, the fully automatic mold preheating machine further includes an air supply pipe, a third solenoid valve, and a first pressure regulating valve, wherein the third solenoid valve and the first pressure regulating valve are respectively communicatively connected to the control panel;

[0018] The two ends of the gas supply pipe are respectively connected to the flame nozzle and the output end of the third solenoid valve. The first pressure regulating valve is installed on the first branch pipe and is used to control the opening of the first branch pipe. The second branch pipe and the first branch pipe are respectively connected to the input end of the third solenoid valve and can be controlled by the third solenoid valve to alternately connect with the gas supply pipe.

[0019] Optionally, the fully automatic mold preheating machine further includes a second pressure regulating valve, a fourth solenoid valve, a first connecting pipe, and a second connecting pipe, wherein the second pressure regulating valve and the fourth solenoid valve are respectively communicatively connected to the control panel;

[0020] The end of the main air pipe furthest from the air compressor forms a third branch pipe, which is connected in parallel with the first and second branch pipes. The second pressure regulating valve is installed on the third branch pipe and is used to control the opening of the third branch pipe. The two ends of the first connecting pipe are respectively connected to the second branch pipe and the third solenoid valve so that the second branch pipe is connected to one input end of the third solenoid valve through the first connecting pipe. The two ends of the second connecting pipe are respectively connected to the other input end of the third solenoid valve and the output end of the fourth solenoid valve. The first branch pipe and the third branch pipe are respectively connected to the input end of the fourth solenoid valve and can be controlled by the fourth solenoid valve to alternately connect with the second connecting pipe.

[0021] Optionally, the fully automatic mold preheating machine also includes a protective pipe;

[0022] The oil pipeline and the gas supply pipeline pass through the inside of the protective pipe.

[0023] Optionally, the fully automatic mold preheating machine also includes a filter installed on the main oil pipe for filtering impurities.

[0024] Optionally, the fully automatic mold preheating machine also includes a level gauge that is communicatively connected to the control panel;

[0025] The level gauge is installed on the fuel tank and is used to detect the fuel level in the fuel tank.

[0026] Optionally, the control panel is equipped with a touch screen for human-computer interaction.

[0027] Optionally, the fully automatic mold preheating machine also includes a frame with wheels at the bottom;

[0028] The oil tank, the air compressor, and the control panel are integrated and installed on the frame.

[0029] The beneficial effects of the fully automatic mold preheating machine provided in this application are as follows: Compared with the prior art, in the fully automatic mold preheating machine provided in this application, the oil tank for storing fuel is connected to the bypass port of the negative pressure generator through a negative pressure pipe. Since the bypass port is connected to the air outlet that is connected to the external atmosphere, when the control panel turns on the air compressor and closes the first solenoid valve, on the one hand, the oil tank can be connected to the atmosphere, and on the other hand, the compressed air generated from the air compressor will be delivered to the flame nozzle in sequence through the main air pipe and the air supply pipe. In this way, a negative pressure will be formed at the end of the oil supply pipe near the flame nozzle, and the fuel in the oil tank can be driven by atmospheric pressure to the flame nozzle to be atomized and used for mold preheating. When the fuel level in the tank is low, the first solenoid valve can be opened via the control panel, allowing compressed air generated in the air compressor to reach the inlet of the negative pressure generator through the second branch pipe. Since the inlet and outlet of the negative pressure generator are coaxially arranged, the compressed air flowing from the inlet to the outlet creates a negative pressure at the bypass port, thus creating a negative pressure in the fuel tank. Because the fuel tank is connected to an external fuel storage device via a suction pipe, the tank can automatically replenish fuel from the external storage device. Therefore, the fully automatic mold preheating machine provided in this application achieves automatic fuel delivery from the fuel tank to the flame nozzle and automatic fuel replenishment of the fuel tank through ingenious pipe design and simple structural components, with a level of automation far superior to existing technologies. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Fig. 1 This is a partial structural schematic diagram of the fully automatic mold preheating machine in an embodiment of this application;

[0032] Fig. 2 This is a cross-sectional structural diagram of the negative pressure generator in the embodiments of this application;

[0033] Fig. 3 This is a schematic diagram of the overall structure of the fully automatic mold preheating machine in the embodiments of this application.

[0034] In the figure, the following labels are used: 101, flame nozzle; 102, oil tank; 103, oil supply pipe; 104, air compressor; 105, main air pipe; 106, first branch air pipe; 107, second branch air pipe; 108, negative pressure generator; 109, negative pressure pipe; 110, first solenoid valve; 111, oil suction pipe; 112, control panel; 113, main oil pipe; 114, tee; 115, second solenoid valve; 116, regulating valve; 117, first... 118. Oil supply branch pipe; 119. Air supply pipe; 120. Third solenoid valve; 121. First pressure regulating valve; 122. Second pressure regulating valve; 123. Fourth solenoid valve; 124. First connecting pipe; 125. Second connecting pipe; 126. Third air branch pipe; 127. Protective pipe; 128. Filter; 129. Level gauge; 130. Touch screen; 131. Frame; 181. Air inlet; 182. Air outlet; 183. Bypass port. Detailed Implementation

[0035] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0036] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0037] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] Please refer to the following: Figs. 1-3 The following describes a fully automatic mold preheating machine provided in an embodiment of this application. The fully automatic mold preheating machine includes a flame nozzle 101, an oil tank 102, an oil supply pipe 103, an air compressor 104, a main air pipe 105, a negative pressure generator 108, a negative pressure pipe 109, a first solenoid valve 110, an oil suction pipe 111, and a control panel 112. Wherein:

[0040] Fuel tank 102 is used to store fuel; fuel line 103 connects fuel tank 102 and flame nozzle 101; air compressor 104 is used to generate compressed air; one end of main air pipe 105 is connected to air compressor 104, and the other end forms a first branch pipe 106 and a second branch pipe 107 in parallel. The first branch pipe 106 is connected to flame nozzle 101 and is used to atomize fuel from fuel line 103; negative pressure generator 108 forms an inlet 181 and an outlet 182 coaxially arranged, and also forms an inlet 181 and an outlet 182 connected to the inlet 181 and outlet 182. A bypass port 183 connects the air passages between the two sections. The air inlet 181 is also connected to the second branch pipe 107, and the air outlet 182 is connected to the external atmosphere. A negative pressure pipe 109 connects the top of the oil tank 102 and the bypass port 183. A first solenoid valve 110 is installed on the second branch pipe 107 and used to control the opening and closing of the second branch pipe 107. One end of the oil suction pipe 111 is connected to the oil tank 102, and the other end is a free end used to connect to an external oil storage device. The control panel 112 is communicatively connected to the air compressor 104 and the first solenoid valve 110. It can be understood that the flame nozzle 101 in this embodiment is a commonly used nozzle in the art for ejecting preheated flames. The control panel 112 includes various control buttons and control systems for operation, which will not be described in detail here.

[0041] According to the structure provided in this embodiment, in the fully automatic mold preheating machine provided in this embodiment, the fuel tank 102 for storing fuel is connected to the bypass port 183 of the negative pressure generator 108 through the negative pressure pipe 109. Since the bypass port 183 is connected to the air outlet 182 which is connected to the external atmosphere, when the control panel 112 turns on the air compressor 104 and closes the first solenoid valve 110, on the one hand, the fuel tank 102 can be connected to the atmosphere, and on the other hand, the compressed air generated from the air compressor 104 will be transported to the flame nozzle 101 through the main air pipe 105 and the air supply pipe 119 in sequence. In this way, a negative pressure will be formed at the end of the fuel supply pipe 103 near the flame nozzle 101, and the fuel in the fuel tank 102 can be driven by atmospheric pressure to the flame nozzle 101 to be atomized and used for mold preheating. When the fuel level in the fuel tank 102 is low, the first solenoid valve 110 can be opened via the control panel 112 to allow the compressed air generated in the air compressor 104 to reach the air inlet 181 of the negative pressure generator 108 through the second branch pipe 107. Since the air inlet 181 and the air outlet 182 of the negative pressure generator 108 are coaxially arranged, the compressed air will create a negative pressure in the bypass port 183 as it flows from the air inlet 181 to the air outlet 182 of the negative pressure generator 108. This will also create a negative pressure in the fuel tank 102. Since the fuel tank 102 is connected to the suction pipe 111 for connecting to the external fuel storage device, the fuel tank 102 can automatically replenish fuel from the external fuel storage device through the suction pipe 111. Therefore, the fully automatic mold preheating machine provided in this embodiment achieves automatic oil supply from the oil tank 102 to the flame nozzle 101 and automatic fuel replenishment to the oil tank 102 through ingenious pipe design and simple structural components. Its degree of automation is far superior to the existing technology.

[0042] In another embodiment of this application, please refer to [the relevant document / reference]. Figs. 1-3 The fully automatic mold preheating machine also includes a main oil pipe 113, a tee 114, a second solenoid valve 115, and a regulating valve 116. The second solenoid valve 115 and the regulating valve 116 are respectively connected to the control panel 112. One end of the main oil pipe 113 is connected to the oil tank 102, and the other end forms a first oil supply branch pipe 117 and a second oil supply branch pipe 118 in parallel. The first oil supply branch pipe 117, the second oil supply branch pipe 118, and the end of the oil supply pipe 103 away from the flame nozzle 101 are respectively connected through the tee 114. The second solenoid valve 115 is installed on the first oil supply branch pipe 117 and is used to control the opening and closing of the first oil supply branch pipe 117. The regulating valve 116 is installed on the second oil supply branch pipe 118 and is used to adjust the opening degree of the second oil supply branch pipe 118.

[0043] According to the structure provided in this embodiment, when the second solenoid valve 115 is opened, the fuel in the fuel tank 102 can be quickly input into the flame nozzle 101 through the first fuel supply branch pipe 117 and the fuel delivery pipe 103, achieving full-speed and rapid fuel supply. This design is particularly useful when the flame nozzle 101 is started and ignited (in actual preheating, the second solenoid valve 115 can control the opening for about 1 second). When the second solenoid valve 115 is closed and the regulating valve 116 is open, the operator can operate the regulating valve 116 through the relevant buttons on the control panel 112 to adjust the fuel supply, thereby meeting the different fuel requirements of different preheating stages. This is beneficial to further improve the automation level of the fully automatic mold preheating machine in this embodiment.

[0044] In another embodiment of this application, please refer to [the relevant document / reference]. Figs. 1-3 The fully automatic mold preheating machine also includes an air supply pipe 119, a third solenoid valve 120, and a first pressure regulating valve 121. The third solenoid valve 120 and the first pressure regulating valve 121 are respectively connected to the control panel 112. The two ends of the air supply pipe 119 are respectively connected to the flame nozzle 101 and the output end of the third solenoid valve 120. The first pressure regulating valve 121 is installed on the first branch pipe 106 and is used to control the opening of the first branch pipe 106. The second branch pipe 107 and the first branch pipe 106 are respectively connected to the input end of the third solenoid valve 120 and can be controlled by the third solenoid valve 120 to alternately connect with the air supply pipe 119.

[0045] According to the structure provided in this embodiment, through the intelligent control of the third solenoid valve 120, the fully automatic mold preheating machine in this embodiment can provide two different gas supply modes: one is to connect to the gas supply pipe 119 through the second branch pipe 107 to achieve fast and direct gas supply; the other is to connect to the gas supply pipe 119 through the first branch pipe 106. Since the first pressure regulating valve 121 for fine pressure adjustment is installed on the first branch pipe 106, the gas supply pressure can be adjusted and changed. Therefore, this gas supply mode can correspond to a more delicate and stable gas supply. Combining the two fuel supply modes described in the foregoing embodiments, when the flame nozzle 101 needs to be started quickly, the second solenoid valve 115 can be opened to allow fuel to be rapidly and in large quantities supplied to the flame nozzle 101 through the first fuel supply branch pipe 117; at the same time, the third solenoid valve 120 controls the second air branch pipe 107 to connect with the air supply pipe 119, so as to realize a large flow of high-pressure air supply (since no pressure regulating valve is installed on the second air branch pipe 107, the high-pressure air output by the air compressor 104 is supplied to the air supply pipe 119 through the second air branch pipe 107) to atomize the fuel. Through such a short-term combination of large fuel volume and high-pressure air volume, it is ensured that the flame nozzle 101 can quickly reach the gas concentration required for ignition. When the preheater enters the stable preheating stage (i.e., the flame nozzle 101 has been ignited and is burning stably), the second solenoid valve 115 can be closed and the regulating valve 116 can be started to work, so that the fuel supply can be adjusted as needed through the control panel 112; at this time, the third solenoid valve 120 switches to the state where the first branch pipe 106 is connected to the air supply pipe 119, and the gas pressure is finely adjusted through the first pressure regulating valve 121 to ensure the uniformity and stability of the preheating temperature, which is conducive to further improving the automation level of the fully automatic mold preheater in this embodiment.

[0046] In another embodiment of this application, please refer to [the relevant document / reference]. Figs. 1-3The fully automatic mold preheating machine also includes a second pressure regulating valve 122, a fourth solenoid valve 123, a first connecting pipe 124, and a second connecting pipe 125. The second pressure regulating valve 122 and the fourth solenoid valve 123 are respectively communicatively connected to the control panel 112. The end of the main air pipe 105 away from the air compressor 104 also forms a third branch pipe 126 in parallel with the first branch pipe 106 and the second branch pipe 107. The second pressure regulating valve 122 is installed on the third branch pipe 126 and is used to control the opening degree of the third branch pipe 126. The first connecting pipe... The two ends of 124 are respectively connected to the second bronchus 107 and the third solenoid valve 120 so that the second bronchus 107 is connected to one input end of the third solenoid valve 120 through the first connecting pipe 124. The two ends of the second connecting pipe 125 are respectively connected to the other input end of the third solenoid valve 120 and the output end of the fourth solenoid valve 123. The first bronchus 106 and the third bronchus 126 are respectively connected to the input end of the fourth solenoid valve 123 and can be controlled by the fourth solenoid valve 123 to alternately connect with the second connecting pipe 125.

[0047] According to the structure provided in this embodiment, the fully automatic mold preheating machine provided in this embodiment can achieve three gas supply modes through the cooperation of the third solenoid valve 120 and the fourth solenoid valve 123. The first mode is through direct connection of the second branch pipe 107 and the first connecting pipe 124 to the third solenoid valve 120; the second mode is through control of the fourth solenoid valve 123, connecting the first branch pipe 106 to the third solenoid valve 120; and the third mode is through control of the fourth solenoid valve 123, connecting the third branch pipe 126 to the third solenoid valve 120. Thus, since the gas pressure in both the first branch pipe 106 and the third branch pipe 126 can be adjusted, in actual use, the control panel 112 can be used to switch between the control and regulating valves 116 to obtain the optimal fuel-air mixture ratio, improve combustion efficiency, and further enhance the automation level of the fully automatic mold preheating machine in this embodiment.

[0048] In another embodiment of this application, please refer to [the relevant document / reference]. Figs. 1-3 The fully automatic mold preheating machine also includes a protective tube 127; an oil supply pipe 103 and an air supply pipe 119 are installed inside the protective tube 127. According to the structure provided in this embodiment, the protective tube 127 can protect the internal oil supply pipe 103 and air supply pipe 119, which is beneficial to significantly improve the operational stability of the fully automatic mold preheating machine in this embodiment.

[0049] In another embodiment of this application, please refer to [the relevant document / reference]. Figs. 1-3The fully automatic mold preheating machine also includes a filter 128 installed on the main oil pipe 113 for filtering impurities. According to the structure provided in this embodiment, the filter 128 installed on the main oil pipe 113 can effectively filter impurities contained in the fuel, which helps to further improve the operational stability of the fully automatic mold preheating machine in this embodiment.

[0050] In another embodiment of this application, please refer to [the relevant document / reference]. Figs. 1-3 The fully automatic mold preheating machine also includes a level gauge 129 that is communicatively connected to the control panel 112; the level gauge 129 is installed on the oil tank 102 and is used to detect the fuel level in the oil tank 102. According to the structure provided in this embodiment, the control panel 112 can automatically control the first solenoid valve 110 to open or close based on the information feedback from the level gauge 129, which helps to further improve the operational stability of the fully automatic mold preheating machine in this embodiment.

[0051] In another embodiment of this application, please refer to [the relevant document / reference]. Figs. 1-3 The control panel 112 is equipped with a touch screen 130 for human-computer interaction. According to the structure provided in this embodiment, the touch screen 130 on the control panel 112 can significantly improve the ease of operation of the fully automatic mold preheating machine in this embodiment.

[0052] In another embodiment of this application, please refer to [the relevant document / reference]. Figs. 1-3 Figs. 1-3 The fully automatic mold preheating machine also includes a frame 131 with wheels at the bottom; an oil tank 102, an air compressor 104, and a control panel 112 are integrated and mounted on the frame 131. According to the structure provided in this embodiment, the frame 131 with wheels facilitates the overall movement of the fully automatic mold preheating machine provided in this embodiment, which helps to further improve the stability of the fully automatic mold preheating machine in this embodiment.

[0053] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fully automatic mold preheating machine, characterized in that, include: Flame nozzle (101); Fuel tank (102) is used to store fuel; An oil pipeline (103) connects the oil tank (102) and the flame nozzle (101). Air compressor (104), used to generate compressed air; The main air pipe (105) is connected to the air compressor (104) at one end and forms a first branch pipe (106) and a second branch pipe (107) in parallel at the other end. The first branch pipe (106) is connected to the flame nozzle (101) and is used to atomize fuel from the oil supply pipe (103). The negative pressure generator (108) forms an air inlet (181) and an air outlet (182) arranged coaxially, and also forms a bypass port (183) that communicates with the air passage between the air inlet (181) and the air outlet (182). The air inlet (181) is also connected to the second bronchus (107), and the air outlet (182) is connected to the outside atmosphere. Negative pressure pipe (109) connects the top of the oil tank (102) and the bypass port (183). A first solenoid valve (110) is installed on the second bronchus (107) and is used to control the opening and closing of the second bronchus (107); The oil suction pipe (111) is connected at one end to the oil tank (102) and at the other end is a free end for connecting to an external oil storage device; The control panel (112) is communicatively connected to the air compressor (104) and the first solenoid valve (110), respectively.

2. The fully automatic mold preheating machine as described in claim 1, characterized in that: The fully automatic mold preheating machine also includes a main oil pipe (113), a three-way valve (114), a second solenoid valve (115), and a regulating valve (116). The second solenoid valve (115) and the regulating valve (116) are respectively connected to the control panel (112). One end of the main oil pipe (113) is connected to the oil tank (102), and the other end forms a first oil supply branch pipe (117) and a second oil supply branch pipe (118) connected in parallel. The first oil supply branch pipe (117), the second oil supply branch pipe (118) and the oil delivery pipe (103) are connected at the ends away from the flame nozzle (101) through the tee (114). The second solenoid valve (115) is installed on the first oil supply branch pipe (117) and is used to control the opening and closing of the first oil supply branch pipe (117). The regulating valve (116) is installed on the second oil supply branch pipe (118) and is used to regulate the opening degree of the second oil supply branch pipe (118).

3. The fully automatic mold preheating machine as described in claim 2, characterized in that: The fully automatic mold preheating machine also includes an air supply pipe (119), a third solenoid valve (120), and a first pressure regulating valve (121). The third solenoid valve (120) and the first pressure regulating valve (121) are respectively connected to the control panel (112). The two ends of the gas supply pipe (119) are respectively connected to the flame nozzle (101) and the output end of the third solenoid valve (120). The first pressure regulating valve (121) is installed on the first branch pipe (106) and is used to control the opening of the first branch pipe (106). The second branch pipe (107) and the first branch pipe (106) are respectively connected to the input end of the third solenoid valve (120) and can be controlled by the third solenoid valve (120) to alternately connect with the gas supply pipe (119).

4. The fully automatic mold preheating machine as described in claim 3, characterized in that: The fully automatic mold preheating machine also includes a second pressure regulating valve (122), a fourth solenoid valve (123), a first connecting pipe (124) and a second connecting pipe (125), wherein the second pressure regulating valve (122) and the fourth solenoid valve (123) are respectively communicatively connected to the control panel (112). The end of the main air pipe (105) away from the air compressor (104) also forms a third branch pipe (126) in parallel with the first branch pipe (106) and the second branch pipe (107). The second pressure regulating valve (122) is installed on the third branch pipe (126) and used to control the opening degree of the third branch pipe (126). The two ends of the first connecting pipe (124) are respectively connected to the second branch pipe (107) and the third solenoid valve (120) so that the second branch pipe (107) The first connecting pipe (124) is connected to one input terminal of the third solenoid valve (120), and the two ends of the second connecting pipe (125) are respectively connected to the other input terminal of the third solenoid valve (120) and the output terminal of the fourth solenoid valve (123). The first bronchus (106) and the third bronchus (126) are respectively connected to the input terminal of the fourth solenoid valve (123) and can be controlled by the fourth solenoid valve (123) to alternately connect with the second connecting pipe (125).

5. The fully automatic mold preheating machine as described in claim 3, characterized in that: The fully automatic mold preheating machine also includes a protective tube (127); The oil pipeline (103) and the gas supply pipeline (119) pass through the inside of the protective pipe (127).

6. The fully automatic mold preheating machine as described in claim 2, characterized in that: The fully automatic mold preheating machine also includes a filter (128) installed on the main oil pipe (113) for filtering impurities.

7. The fully automatic mold preheating machine as described in claim 1, characterized in that: The fully automatic mold preheating machine also includes a level gauge (129) that is communicatively connected to the control panel (112). The level gauge (129) is installed on the fuel tank (102) and is used to detect the fuel level in the fuel tank (102).

8. The fully automatic mold preheating machine as described in claim 1, characterized in that: The control panel (112) is equipped with a touch screen (130) for human-computer interaction.

9. The fully automatic mold preheating machine as described in claim 1, characterized in that: The fully automatic mold preheating machine also includes a frame (131) with wheels at the bottom. The oil tank (102), the air compressor (104), and the control panel (112) are integrated and mounted on the frame (131).

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