High-efficiency energy-saving formwork microwave dewaxing device and its usage method

Abstract

The present invention discloses an efficient energy-saving die shell microwave dewaxing device and its usage method, which includes a cabinet body, a motor, a microwave tube, a microwave power supply, a water tank, a heat dissipation box, a water pump and a controller. The cabinet body is provided with two cavities, and a sliding door is arranged on the front side. The upper part of the two cavities is provided with a motor, the power shaft of the motor extends downward and is connected to a rotating shaft, and a tray is arranged on the rotating shaft; the side wall of the cavity is provided with a microwave tube and a microwave power supply; the lower side of the rear part of the cabinet body is provided with a water tank, a heat dissipation box and a water pump connected in series, and a controller is arranged on one side of the cabinet body. The motor, the microwave power supply, the heat dissipation box and the water pump are respectively electrically connected to the controller and controlled by it. The present invention adopts the microwave heating method for dewaxing and the double-space alternating working method and structure, which has reasonable design, simple structure and is easy to manufacture. The dewaxing of the present invention is clean and there is no need for manual dewaxing again, with small energy consumption, simple process, short dewaxing time and high safety factor. Moreover, during dewaxing, the reduced wax material is directly collected, reducing the waste of raw materials and saving costs.

Description

Technical Field

[0001] The present invention relates to the technical field of metal casting mold shell dewaxing equipment, and particularly relates to an efficient energy-saving mold shell microwave dewaxing device and a using method thereof. Background Art

[0002] Investment casting, also known as lost-wax casting, includes processes such as wax pressing, wax trimming, tree assembling, slurry dipping, wax melting, metal liquid casting, and post-treatment. Lost-wax casting is to make a wax mold of the part to be cast with wax, and then coat the wax mold with slurry, which is the clay mold. After the clay mold is dried, it is baked into a ceramic mold. Once baked, the wax mold completely melts and runs off, leaving only the ceramic mold. Generally, a pouring gate is left when making the clay mold, and then molten metal is poured into the pouring gate. After cooling, the required part is made. The investment casting process is relatively complex and not easy to control, and the materials used and consumed are relatively expensive. Therefore, it is suitable for producing small parts with complex shapes, high precision requirements, or difficult to be processed by other methods, such as the blades of turbine engines. Among them, after the mold shell is completely hardened, the mold assembly needs to be melted out of the mold shell. Since the mold assembly is commonly made of wax-based mold material, this process is also called dewaxing.

[0003] At present, when traditional equipment performs the dewaxing process on wax molds, it mostly uses high-temperature steam to heat the mold shell. There are often problems such as incomplete dewaxing of the wax mold, and manual dewaxing of the wax mold needs to be carried out again. The existing working method also has defects such as high energy consumption, complex processes, long dewaxing time, and low safety factor. Moreover, when the existing equipment dewaxes, the wax removed contains water, and it is difficult to collect and restore the wax material, resulting in waste of raw materials and increasing costs. Summary of the Invention

[0004] The purpose of the present invention is to provide an efficient energy-saving mold shell microwave dewaxing device and a using method thereof in view of the defects existing in the prior art.

[0005] Its technical solution is as follows: an efficient energy-saving die shell microwave dewaxing device, which includes a cabinet body, a motor, a microwave tube, a microwave power supply, a water tank, a heat dissipation box, a water pump and a controller. The cabinet body is a box structure with a first cavity and a second cavity, and a sliding door is provided on the front side. A first motor and a second motor are respectively provided on the upper parts of the first cavity and the second cavity. The power shafts of the first motor and the second motor face downward and are connected to a rotating shaft. The lower end of the rotating shaft is rotationally connected to the bottom plate of the first cavity or the second cavity through a bearing. A tray is provided on the rotating shaft. Microwave tubes are provided outside the rear side wall, the left side wall of the first cavity and outside the rear side wall, the right side wall of the second cavity. The emission surface of the microwave tube passes through the side walls of the first cavity and the second cavity and faces the inside of the cavity. A first temperature sensor and a second temperature sensor are respectively provided in the first cavity and the second cavity. Microwave power supplies are fixedly provided on both sides of the cabinet body through a frame. The output end of the microwave power supply is electrically connected to the power supply end of the microwave tube. A water tank, a heat dissipation box and a water pump are provided on the lower side of the rear part of the cabinet body. The water cooling pipelines of the water tank, the heat dissipation box, the water pump and the microwave tube are connected in series. A water temperature sensor is provided in the heat dissipation box. A controller is provided on the upper part of one side of the cabinet body. The water temperature sensor, the first temperature sensor, the second temperature sensor, the first motor, the second motor, the microwave power supply, the heat dissipation box and the water pump are respectively electrically connected to the controller and controlled by it.

[0006] At least two trays are provided on the rotating shaft.

[0007] At least six microwave tubes are provided on each side wall of the first cavity and the second cavity, and the number of microwave power supplies is equal to the number of microwave tubes.

[0008] The water cooling pipelines of all the microwave tubes are connected in series or in parallel.

[0009] Both the first motor and the second motor are speed-regulating motors.

[0010] The sliding door is an electric sliding door driven by a telescopic rod, which is electrically connected to the controller and controlled by it. The width of the sliding door matches the front opening of the first cavity or the second cavity. A first limit switch and a second limit switch are respectively provided on the inner side of the sliding door, the front left side of the first cavity and the front right side of the second cavity. The first limit switch and the second limit switch are electrically connected to the controller.

[0011] Both the first temperature sensor and the second temperature sensor are infrared temperature sensors, which are respectively provided on the right side wall of the first cavity and the left side wall of the second cavity.

[0012] A fan electrically connected to the controller is provided on the heat dissipation box.

[0013] The controller includes a motor speed regulator and a central controller. The power supply terminal is connected to the power supply terminals of the central controller, the first motor speed regulator, and the second motor speed regulator. The first temperature sensor, the second temperature sensor, the first limit switch, the second limit switch, and the water temperature sensor are respectively connected to the first to fifth input terminals of the central controller. The first output terminal of the central controller is connected to the control terminal of the first motor speed regulator, and the output terminal of the first motor speed regulator is connected to the first motor. The second output terminal of the central controller is connected to the control terminal of the second motor speed regulator, and the output terminal of the second motor speed regulator is connected to the second motor. The third output terminal of the central controller is connected to the microwave power input terminals of all the microwave tubes connected to the side wall of the first cavity. The fourth output terminal of the central controller is connected to the microwave power input terminals of all the microwave tubes connected to the side wall of the second cavity. The fifth output terminal of the central controller is connected to the water pump. The sixth output terminal of the central controller is connected to the fan on the heat dissipation box.

[0014] The central controller is a programmable controller or a single-chip microcomputer circuit.

[0015] A usage method of an efficient energy-saving die shell microwave dewaxing device is as follows:

[0016] The power supply terminal is connected to the power supply through the main control switch.

[0017] Press the start button. First, the central controller detects whether there are people at the two front openings of the first cavity and the second cavity of the cabinet through the first human body induction sensor and the second human body induction sensor. If there are no people, the central controller drives the sliding door to move to the right to completely close the second cavity, and at this time, no control signals are output from other output terminals of the central controller.

[0018] The staff places the die shell to be dewaxed on the tray in the first cavity. After placing it, they leave and press the door control button. At this time, the central controller drives the sliding door to move to the left to completely close the first cavity. Then, the central controller controls the start of the circulating water pump to cool the microwave tubes, and then turns on the first motor through the first motor speed regulator and turns on the microwave tubes on the rear side wall and the left side wall of the first cavity through the microwave power supply to heat and dewax the die shell on the tray in the first cavity for 3 - 15 minutes.

[0019] When the first cavity is working, the staff can place another group of mold shells to be dewaxed on the tray in the second cavity. After placing them, they can leave and press the door control button to leave. The door control button pressed this time is for the reserved sliding door action. When the dewaxing work in the first cavity is completed in step 3, the central controller controls to turn off the first motor and the microwave tubes on the rear side wall and the left side wall of the first cavity. Then the sliding door will automatically run from the entrance of the first cavity to the entrance of the second cavity until the front door of the second cavity is completely closed. Then, the second motor is started through the second motor speed regulator and the microwave tubes on the rear side wall and the right side wall of the second cavity are turned on through the microwave power supply to heat and dewax the mold shells on the tray in the second cavity for 3 - 15 minutes.

[0020] During the working process, repeat steps 3 - 4. When the work needs to end, after emptying the objects in the first cavity or the second cavity, press the stop button. After the dewaxing work in the second cavity or the first cavity is completed, the sliding door will automatically return to the first cavity or the second cavity, and the first motor, the second motor, and all microwave tubes will be turned off. Finally, the water pump will be turned off after a delay of 3 - 5 minutes, and the work ends.

[0021] The present invention uses the microwave heating method for dewaxing and the dual - space alternating working method and structure. Compared with the prior art, it has the following advantages: reasonable design, simple structure, easy to manufacture. The dewaxing of the present invention is clean without the need for manual dewaxing again, with low energy consumption, simple process, short dewaxing time, high safety factor, and when dewaxing, the wax removed does not contain moisture, and the recovered wax material can be directly collected, greatly reducing the waste of raw materials and saving costs. Brief Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the front side of an embodiment of the present invention;

[0023] Figure 2 It is a schematic structural diagram of the rear side of an embodiment of the present invention;

[0024] Figure 3 It is a circuit block diagram of an embodiment of the present invention. Detailed Embodiment

[0025] Refer to Figure 1—3, A highly efficient and energy-saving mold shell microwave dewaxing device, comprising a cabinet body, a motor, a microwave tube, a microwave power supply, a water tank, a heat dissipation box, a water pump and a controller. The cabinet body 1 is a box structure provided with a first cavity 11 and a second cavity 12, and a sliding door 13 is provided on the front side. A first motor 2 and a second motor 3 are respectively provided in the upper parts of the first cavity 11 and the second cavity 12. The power shafts of the first motor 2 and the second motor 3 face downward and are connected to a rotating shaft. The lower end of the rotating shaft 4 passes through the first cavity 11 and the second cavity 12 and is rotationally connected to the bottom plate of the first cavity 11 or the second cavity 12 through a bearing. A tray 5 is provided on the rotating shaft 4. Microwave tubes 6 are provided outside the rear side wall and the left side wall of the first cavity 11 and outside the rear side wall and the right side wall of the second cavity 12. The emission surface of the microwave tube 6 passes through the side walls of the first cavity 11 and the second cavity 12 and faces the cavity interior. First temperature sensors 21 and second temperature sensors 22 are respectively provided in the first cavity 11 and the second cavity 12 (the second temperature sensor 22 Figure 1 is not drawn in the figure). Microwave power supplies 7 are fixedly provided on both sides of the cabinet body 1 through frames. The output ends of the microwave power supplies 7 are electrically connected to the power supply ends of the microwave tubes 6. A water tank 8, a heat dissipation box 9 and a water pump 10 are provided at the lower side of the rear part of the cabinet body 1. The water tank 8, the heat dissipation box 9, the water pump 10 and the water cooling pipes of the microwave tubes 6 are connected in series through pipes. A water temperature sensor 14 is provided in the heat dissipation box 9. A controller 15 is provided at the upper part of one side of the cabinet body 1. The water temperature sensor 14, the first temperature sensor 21, the second temperature sensor 22, the first motor 2, the second motor 3, the microwave power supply 7, the heat dissipation box 9 and the water pump 10 are respectively electrically connected to the controller 15 and controlled by it. Dewaxing through holes are evenly distributed on the bottom plate 20 of the first cavity 11 or the second cavity 12. A wax receiving basin 23 is provided below the bottom plate 20 of the first cavity 11 or the second cavity 12.

[0026] At least 2 trays 5 are provided on the rotating shaft; the tray 5 is a circular disk structure, and through holes are evenly distributed on its plane.

[0027] At least 6 microwave tubes 6 are provided on each side wall of the first cavity 11 and the second cavity 12, and the number of the microwave power supplies 7 is equal to the number of the microwave tubes 6.

[0028] The water cooling pipes of all the microwave tubes 6 are connected in series or in parallel (connected in series in the figure).

[0029] Both the first motor 2 and the second motor 3 are speed-regulating motors.

[0030] The sliding door 13 is an electric sliding door driven by a telescopic rod, which is electrically connected to and controlled by the controller 15; the width of the sliding door 13 matches the width of the front opening of the first cavity 11 or the second cavity 12; a first limit switch 16, a first human body induction sensor 24 are respectively provided on the inner side of the sliding door 13, the front left side of the first cavity 11, and a second limit switch 17 and a second human body induction sensor 25 are provided on the front right side of the second cavity 12 (the second limit switch 17 and the second human body induction sensor 25 Figure 1 are not drawn in the figure), and the first limit switch, the first human body induction sensor 24, the second limit switch 17, and the second human body induction sensor 25 are electrically connected to the controller.

[0031] Both the first temperature sensor 21 and the second temperature sensor 22 are infrared temperature sensors, which are respectively arranged on the right side wall of the first cavity 11 and the left side wall of the second cavity 12.

[0032] A blower 91 electrically connected to the controller 15 is provided on the heat dissipation box 9.

[0033] The controller 15 includes a motor speed regulator and a central controller. The power supply terminal 150 is connected to the power supply terminals of the central controller 153, the first motor speed regulator 151, and the second motor speed regulator 152. The first temperature sensor 21, the second temperature sensor 22, the first limit switch 16, the second limit switch 17, and the water temperature sensor 14 are respectively connected to the first to fifth input terminals of the central controller 153. The first output terminal of the central controller 153 is connected to the control terminal of the first motor speed regulator 151, the output terminal of the first motor speed regulator 151 is connected to the first motor 2, the second output terminal of the central controller 153 is connected to the control terminal of the second motor speed regulator 152, and the output terminal of the second motor speed regulator 152 is connected to the second motor 3; the third output terminal of the central controller 153 is connected to the input terminals of the microwave power supplies 7 of all the microwave tubes 6 on the side wall of the first cavity 11, and the fourth output terminal of the central controller 153 is connected to the input terminals of the microwave power supplies 7 of all the microwave tubes 6 on the side wall of the second cavity 12; the fifth output terminal of the central controller 153 is connected to the water pump 10; the sixth output terminal of the central controller 153 is connected to the blower 81 on the heat dissipation box 8; a start button A1, a stop button A2, and a door control button A3 are respectively connected to the sixth, seventh, and eighth input terminals of the central controller 153.

[0034] The central controller 153 is a programmable controller or a single-chip microcomputer circuit; the power of the microwave tube 6 is greater than or equal to 1 kilowatt, and the power of the microwave power supply 7 is matched with the microwave tube 6.

[0035] A usage method of an efficient energy-saving die shell microwave dewaxing device is as follows:

[0036] The power connection terminal 150 is connected to the power supply through the main control switch;

[0037] Press the start button A1. First, the central controller 153 detects whether there are people at the front openings of the first cavity 11 and the second cavity 12 of the cabinet body 1 through the first human body induction sensor 24 and the second human body induction sensor 25. If there is no one in both, the central controller 153 drives the sliding door 13 to move to the right to completely close the second cavity 12, and at this time, no control signals are output from other output terminals of the central controller 153;

[0038] The staff places the shell to be dewaxed on the tray 5 in the first cavity 11. After placing it, leave and press the door control button A3. At this time, the central controller 153 drives the sliding door 13 to move to the left to completely close the first cavity 11. Then, the central controller 153 controls to start the circulating water pump 10 to cool the microwave tube 6, and then starts the first motor 2 through the first motor speed regulator 151 and starts the microwave tubes 6 on the rear side wall and the left side wall of the first cavity 11 through the microwave power supply 7 to heat and dewax the shell on the tray 5 in the first cavity 11 for 3 - 15 minutes (this time is set as needed through the program of the central controller 153);

[0039] When the first cavity 11 is working, the staff can place another group of shells to be dewaxed on the tray 5 in the second cavity 12. After placing it, leave and press the door control button A3 to leave. The door control button A3 pressed this time is to reserve the action of the sliding door 13. When the dewaxing work of the first cavity 11 is completed in step 3, the central controller 153 controls to turn off the first motor 2 and the microwave tubes 6 on the rear side wall and the left side wall of the first cavity 11. Then, the sliding door 13 will automatically run from the entrance of the first cavity 11 to the entrance of the second cavity 12 to completely close the front door of the second cavity 12, and then starts the second motor 3 through the second motor speed regulator 152 and starts the microwave tubes 6 on the rear side wall and the right side wall of the second cavity 12 through the microwave power supply 7 to heat and dewax the shell on the tray 5 in the second cavity 12 for 3 - 15 minutes (this time is set as needed through the program of the central controller 153);

[0040] During the working process, repeat steps 3 - 4. When the work needs to end, after emptying the objects in the first cavity 11 or the second cavity 12, press the stop button A2. After the dewaxing work of the second cavity 12 or the first cavity 11 is completed, the sliding door 13 will automatically return to the position of the first cavity 11 or the second cavity 12, and turn off the first motor 2, the second motor 3 and all the microwave tubes 6. Finally, delay for 3 - 5 minutes to turn off the water pump, and the work ends.

[0041] During the above working process, the first temperature sensor 21 or the second temperature sensor 22 is used to monitor the temperature in the first cavity 11 or the second cavity 12. When the required temperature is reached, the microwave tube 6 on its side wall is turned off, and when the temperature is lower than the set value, the microwave tube 6 is turned on again; the first limit switch 16 and the second limit switch 17 are respectively used to detect whether the sliding door 13 closes the first cavity 11 or the second cavity 12 in place; the water temperature sensor 14 is used to detect the water temperature of the water cooling pipe circulating in the water tank 8, the heat dissipation tank 9, the water pump 10 and the microwave tube 6. When the temperature is higher than 70°C, the fan 91 on the heat dissipation tank 9 is turned on for cooling, and when the temperature is lower than 50°C, the fan 91 is turned off; the first human body induction sensor 24 and the second human body induction sensor 25 are used to detect whether there are people in the first cavity 11 or the second cavity 12 when the door is opened, which is beneficial to safety; during the dewaxing process, the wax in the mold shell melts under the action of microwaves. The melted wax liquid flows through the through holes on the tray 5 and the wax passing through holes on the bottom plate 20 of the first cavity 11 or the second cavity 12 and flows into the wax receiving basin 23 for temporary storage. During the working process, the wax receiving basin 23 can be replaced at any time or a pipeline can be connected to the wax receiving basin 23 to drain the wax. A heat tracing tape is laid on the wax receiving basin 23 and its wax discharging pipeline to prevent the wax from solidifying.

[0042] In the present invention, there are interlayers provided inside the box body walls of the first cavity 11 and the second cavity 12, and radiation shielding layers are provided inside the interlayers. A layer of stainless steel plate is laid on the inner side of the box body walls, and openings are made at the positions corresponding to the microwave tubes on the stainless steel plate; there is an interlayer provided inside the sliding door 13, and a radiation shielding layer is provided inside the interlayer. A layer of stainless steel plate is laid on the inner side of the wall of the sliding door 13; both the rotating shaft 4 and the tray 5 are made of stainless steel material.

[0043] The present invention uses the microwave heating method for dewaxing and the double-space alternating working method and structure, and has the following advantages: reasonable design, simple structure, easy to manufacture. The present invention can dewax cleanly without manual dewaxing again, has low energy consumption, simple processes, short dewaxing time, high safety factor, and when dewaxing, the wax removed does not contain moisture, and the recovered wax material can be directly collected, greatly reducing the waste of raw materials and saving costs.

Claims

1. A high-efficiency energy-saving die shell microwave dewaxing device, comprising a cabinet body, a motor, a microwave tube, a microwave power supply, a water tank, a heat dissipation box, a water pump and a controller, characterized in that: The cabinet body is a box structure provided with a first cavity and a second cavity, and a sliding door on the front side. A first motor and a second motor are respectively provided in the upper parts of the first cavity and the second cavity. The power shafts of the first motor and the second motor face downward and are connected to a rotating shaft. The lower end of the rotating shaft is rotationally and cooperatively connected to the bottom plate of the first cavity or the second cavity through a bearing. A tray is provided on the rotating shaft. Microwave tubes are provided outside the rear side wall and the left side wall of the first cavity and outside the rear side wall and the right side wall of the second cavity. The emission surfaces of the microwave tubes pass through the side walls of the first cavity and the second cavity and face the inside of the cavities. A first temperature sensor and a second temperature sensor are respectively provided in the first cavity and the second cavity. Microwave power supplies are provided on both sides of the cabinet body and are fixedly arranged through a frame. The output ends of the microwave power supplies are electrically connected to the power supply ends of the microwave tubes. A water tank, a heat dissipation box and a water pump are provided on the lower side of the rear part of the cabinet body. The water cooling pipelines of the water tank, the heat dissipation box, the water pump and the microwave tubes are connected in series. A water temperature sensor is provided in the heat dissipation box. A controller is provided in the upper part of one side of the cabinet body. The water temperature sensor, the first temperature sensor, the second temperature sensor, the first motor, the second motor, the microwave power supply, the heat dissipation box and the water pump are respectively electrically connected to the controller and controlled by it. At least two trays are provided on the rotating shaft. At least six microwave tubes are provided on each side wall of the first cavity and the second cavity, and the number of the microwave power supplies is equal to the number of the microwave tubes.

2. The high-efficiency energy-saving formwork microwave dewaxing device according to claim 1, wherein: The water cooling pipelines of all the microwave tubes are connected in series or in parallel.

3. The high-efficiency energy-saving formwork microwave dewaxing device according to claim 1, wherein: Both the first motor and the second motor are speed-regulating motors.

4. The high-efficiency energy-saving formwork microwave dewaxing device according to claim 1, characterized in that: The sliding door is an electric sliding door driven by a telescopic rod, which is electrically connected to the controller and controlled by it. The width of the sliding door matches the front opening of the first cavity or the second cavity. A first limit switch and a second limit switch are respectively provided on the inner side of the sliding door, the front left side of the first cavity and the front right side of the second cavity. The first limit switch and the second limit switch are electrically connected to the controller.

5. The high-efficiency energy-saving formwork microwave dewaxing device according to claim 1, characterized in that: Both the first temperature sensor and the second temperature sensor are infrared temperature sensors, and are respectively provided on the right side wall of the first cavity and the left side wall of the second cavity.

6. The high-efficiency energy-saving formwork microwave dewaxing device according to claim 1, characterized in that: A blower electrically connected to the controller is provided on the heat dissipation box.

7. The high-efficiency energy-saving formwork microwave dewaxing device according to claim 1, characterized in that: The controller includes a motor speed regulator and a central controller. The power supply terminal is connected to the power supply terminal of the central controller, the power supply terminal of the first motor speed regulator and the power supply terminal of the second motor speed regulator. The first temperature sensor, the second temperature sensor, the first limit switch, the second limit switch and the water temperature sensor are respectively connected to the first to fifth input terminals of the central controller. The first output terminal of the central controller is connected to the control terminal of the first motor speed regulator. The output terminal of the first motor speed regulator is connected to the first motor. The second output terminal of the central controller is connected to the control terminal of the second motor speed regulator. The output terminal of the second motor speed regulator is connected to the second motor. The third output terminal of the central controller is connected to the input terminals of the microwave power supplies connected to the microwave tubes on the side walls of the first cavity, and the fourth output terminal of the central controller is connected to the input terminals of the microwave power supplies connected to the microwave tubes on the side walls of the second cavity. The fifth output terminal of the central controller is connected to the water pump; the sixth output terminal of the central controller is connected to the fan on the heat dissipation box.

8. The method for using the high-efficiency energy-saving die shell microwave dewaxing device according to claim 1, characterized in that: Step 1: The power supply terminal is connected to the power supply through the main control switch; Step 2: Press the start button. The central controller first detects whether there are people at the two front openings of the first cavity and the second cavity of the cabinet through the first human body induction sensor and the second human body induction sensor. If there are no people, the central controller drives the sliding door to move to the right to completely close the second cavity, and at this time, no other output terminals of the central controller output control signals; Step 3: The staff places the die shell to be dewaxed on the tray in the first cavity. After placing it, leave and press the door control button. At this time, the central controller drives the sliding door to move to the left to completely close the first cavity. Then, the central controller controls the start of the circulating water pump to cool the microwave tube, and then turns on the first motor through the first motor speed regulator and turns on the microwave tubes on the rear side wall and the left side wall of the first cavity through the microwave power supply to heat and dewax the die shell on the tray in the first cavity for 3 - 15 minutes; Step 4: When the first cavity is working, the staff can place another group of die shells to be dewaxed on the tray in the second cavity. After placing it, leave and press the door control button to leave. The door control button pressed this time is to reserve the action of the sliding door. When the dewaxing work in the first cavity is completed in Step 3, the central controller controls the shutdown of the first motor and the microwave tubes on the rear side wall and the left side wall of the first cavity. Then, the sliding door will automatically run from the entrance of the first cavity to the entrance of the second cavity to completely close the front door of the second cavity. Then, the second motor is turned on through the second motor speed regulator and the microwave tubes on the rear side wall and the right side wall of the second cavity are turned on through the microwave power supply to heat and dewax the die shell on the tray in the second cavity for 3 - 15 minutes; Step 5: During the working process, repeat Steps 3 - 4. When the work needs to end, after emptying the objects in the first cavity or the second cavity, press the stop button. After the dewaxing work in the second cavity or the first cavity is completed, the sliding door will automatically return to the first cavity or the second cavity, and the first motor, the second motor and all microwave tubes will be turned off. Finally, the water pump will be turned off after a delay of 3 - 5 minutes, and the work ends.

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