Control method for wax cake preparation of wax therapy instrument

Abstract

The invention relates to a control method for wax cake preparation of a wax therapy instrument, and the method comprises the steps: a controller calculates the heat dissipation efficiency eta 1 through adjusting the opening degree of an air port adjusting valve and the power of a heat dissipation fan, obtains the time t1 of a cold air rapid heat dissipation stage, and adjusts the time t1 of the cold air rapid heat dissipation stage through adjusting the opening degree of the air port adjusting valve and the power of the heat dissipation fan according to the heat dissipation efficiency eta 1; a heater is turned on through a controller, the heat dissipation efficiency [eta] 3 is calculated, the temperature of inlet air is made to be relatively constant through PID control, the time t3 used in the hot air heat dissipation stage is obtained, an air opening adjusting valve and a heat dissipation fan are turned off through the controller, and a circulating fan is turned on; the heater stops working through the controller, the controller adjusts the opening degree of the air port adjusting valve and opens the cooling fan, the air port adjusting valve and the cooling fan are closed through the controller, and the heater is adjusted according to the temperature difference. The wax cake making device can realize uniform hardness and temperature of wax cakes and improve the wax cake making efficiency.

Description

Technical Field

[0001] The invention belongs to the field of rehabilitation medical equipment, and in particular relates to a control method for preparing wax cakes of a wax therapy instrument. Background Art

[0002] Wax therapy has a long history in China and has been widely used to treat various diseases. Since paraffin wax has large heat capacity and heat storage energy, low thermal conductivity, and does not contain water or other liquids, it does not present convection phenomenon. During treatment (such as wax brushing or wax dipping), the first layer of wax applied to the skin is not in absolute contact with the skin, and there is an air layer in the middle, so the skin can withstand higher temperatures (60-70°C). In addition, since air and sweat moisture cannot diffuse heat to the surroundings through paraffin wax, paraffin wax has a strong heat preservation ability. These characteristics of paraffin wax enable it to produce a strong warming effect on the body, and through the local and remote effects of warmth, it can promote blood circulation, reduce inflammation, and relieve pain. The wax therapy machine subverts the traditional wax therapy method of manually connecting and scooping wax, and can quickly make wax cakes.

[0003] Constant temperature wax therapy machine is usually a box structure, in order to achieve recycling, generally composed of a wax melting tank, a wax injection pipeline, and a cake making box, wherein the structure and control method of the cake making box are the key to determine whether the wax cake can be successfully made and the uniformity and hardness of the wax cake. The existing cake making box structure is shown in a constant temperature cake making box suitable for a box-type wax therapy instrument disclosed by the applicant CN208243767U. But the existing control method is relatively simple, mainly the temperature sensor detects the temperature of the cake making box, and then the controller adjusts the fan speed to complete the wax cake making. Such a control method can cause the problem of uneven hardness and temperature of the wax cake, such as the upper layer of the wax cake forming a solidified layer and the lower layer is still wax liquid during production, and the wax cake at the air inlet is too hard. Summary of the invention

[0004] In order to solve the problem that the existing cake making box control method leads to uneven hardness and temperature of finished wax cakes, the present invention provides a control method for preparing wax cakes of a wax therapy instrument, and divides the control of the wax cake box into six stages. In each stage, the temperature and wind speed in the wax cake box are controlled to adjust the heat dissipation efficiency, thereby improving the wax cake production efficiency and avoiding the problem of uneven hardness and temperature of the wax cakes.

[0005] In order to solve the above problems, the present invention proposes a control method for preparing wax cakes of a wax therapy instrument, comprising a cake making box, a tray is arranged in the cake making box, ventilation holes are opened on the side of the cake making box, an air duct is arranged on the side of the cake making box corresponding to the ventilation holes, an exhaust channel is connected to the outside of the air duct, a circulating fan is arranged at the air inlet of the air duct, an air outlet regulating valve is arranged on the air inlet, a heat dissipation fan is arranged at the air outlet of the exhaust channel, a heater is arranged in the air duct near the circulating fan, a first temperature sensor is arranged in the air duct, and a second temperature sensor is arranged in the cake making box;

[0006] The first temperature sensor and the second temperature sensor are connected to a controller, an output end of the controller is connected to a driving module, and the driving module is electrically connected to a circulation fan, a heat dissipation fan, an air outlet regulating valve and a heater;

[0007] The controller is provided with a control method, the control method comprising:

[0008] Step 1: The controller enters the cold air rapid heat dissipation stage by adjusting the opening of the air outlet regulating valve and the power of the heat dissipation fan, calculates the heat dissipation efficiency η1, and obtains the time t1 used in the cold air rapid heat dissipation stage;

[0009] Step 2: According to the heat dissipation efficiency η1, the controller enters the cold air slow heat dissipation stage by adjusting the opening of the air outlet regulating valve and the heat dissipation fan power, calculates the heat dissipation efficiency η2, and obtains the time t2 used in the cold air slow heat dissipation stage;

[0010] Step 3: Turn on the heater through the controller to enter the hot air cooling stage, calculate the cooling efficiency {η3}, use PID control to make the temperature of the incoming air relatively constant, and obtain the time t3 used in the hot air cooling stage;

[0011] Step 4: Close the air outlet regulating valve and the cooling fan through the controller and open the circulation fan to enter the hot air compensation stage;

[0012] Step 5: The controller stops the heater from working, adjusts the opening of the air outlet regulating valve and turns on the cooling fan to enter the PID constant temperature cooling stage;

[0013] Step 6: Close the air outlet regulating valve and the cooling fan through the controller, adjust the heater according to the temperature difference, and enter the insulation cycle stage.

[0014] Furthermore, the step 1 comprises:

[0015] The controller fully opens the air outlet regulating valve through the driving module, and the heat dissipation fan works at full speed. The paraffin mass m is obtained according to the tray size, the paraffin specific heat c is obtained according to the type of paraffin, and the melting temperature T is known. The temperature T1 in the cake making box is obtained through the second temperature sensor, and then the temperature difference ΔTa between T and T1 is obtained;

[0016] Set the cake box temperature threshold to Tr+ΔTa, and record the time t1 taken for the temperature to change from T to Tr+ΔTa, where Tr is the melting point of paraffin wax;

[0017] According to the paraffin mass m, paraffin specific heat capacity c, temperature difference ΔT1 and time t1, the heat dissipation efficiency η1 is obtained;

[0018] When the detection value of the second temperature sensor is the cake box temperature threshold Tr+ΔTa, the controller enters the cold air slow heat dissipation stage.

[0019] Step 1 is the first stage, in which the cake-making box is quickly cooled to increase the heat dissipation speed of the wax cake.

[0020] Furthermore, the step 2 comprises:

[0021] The controller adjusts the opening of the air outlet regulating valve and the power of the cooling fan through the drive module to adjust the wind pressure and wind speed;

[0022] Set the temperature threshold of the cake making box to Tr, obtain the temperature T2 in the cake making box through the second temperature sensor, and then obtain the temperature difference ΔT2 between Tr and T2, and record the time t2 taken by ΔT2 to 0.

[0023] According to the paraffin mass m, paraffin specific heat capacity c, temperature difference ΔT2 and time t1, the heat dissipation efficiency η2 is obtained;

[0024] When the detection value of the second temperature sensor reaches the cake box temperature threshold Tr, the controller enters the hot air heat dissipation stage.

[0025] Step 2 is the second stage, which is used to prevent the wax cake from solidifying quickly and the temperature and hardness of the wax cake from being uneven.

[0026] Furthermore, the step 3 comprises:

[0027] Set the inlet air temperature difference Tb as shown in formula (1):

[0028] Tb=al / η1+b1 / η2(1);

[0029] Among them, al and b1 are heat dissipation efficiency constants, and the air inlet temperature is Tr-Tb;

[0030] The controller adjusts the heater power through PID control, and the temperature of the inlet air is relatively constant, and the inlet air temperature is constant at Tr-Tb, where Tr is the melting point of paraffin.

[0031] Since the inlet air temperature needs stabilization time to be constant, the maximum value η'3 within 10 minutes is selected from the heat dissipation efficiency {η3};

[0032] The temperature threshold of the cake making box is set to Tr-Tc, where Tc is as shown in formula (2):

[0033] Tc=a1 / n1+b1 / n2+c1 / n'3(2);

[0034] Where c1 is the heat dissipation efficiency constant;

[0035] Record the time t3 from Tr to Tr-Tc, and obtain the average heat dissipation efficiency η3 based on the paraffin mass m, paraffin specific heat capacity c, temperature difference Tc and time t3;

[0036] When the detection value of the second temperature sensor reaches the cake box temperature threshold Tr-Tc, the controller enters the hot air compensation stage.

[0037] Step 3 is the third stage, in which the air inlet temperature T-Tb is dynamically adjusted according to the heat dissipation efficiencies η1 and η2 of the first two stages. The third stage is used to prevent the wax liquid surface from solidifying quickly, which affects heat dissipation and wax cake formation.

[0038] Furthermore, the step 4 comprises:

[0039] Calculate the thermal compensation temperature Td, and adjust the cake box temperature according to the thermal compensation temperature Td. The compensation temperature Td is shown in formula (3):

[0040] Td=a2 / n1+b2 / n1+c2 / n3(3);

[0041] Among them, a2, b2 and c2 are heat dissipation efficiency constants, and η3 is the average value of the t3 stage;

[0042] According to formula (4), the compensation time t4 is calculated:

[0043] t4=d1*(eta1*t1+eta2*t2+eta3*t3)(4);

[0044] Where d1 is the heat dissipation efficiency constant;

[0045] The controller closes the air outlet regulating valve and the cooling fan and turns on the circulation fan, and enters the PID constant temperature cooling stage after t4 time.

[0046] Step 4 is the fourth stage. In the fourth stage, the wax cake gradually takes shape. The heat dissipation speed at the air inlet is faster, so the wax cake solidifies faster at the air inlet. In order to ensure the uniform temperature and hardness of the wax cake, temperature compensation is performed on the wax cake to solve the problem of faster heat dissipation at the air inlet.

[0047] Furthermore, the step 5 comprises:

[0048] The controller stops the heater, sets the cake box temperature threshold Te, obtains the cake box temperature Tf through the second temperature sensor, and calculates the temperature difference ΔTg1 between the cake box temperature threshold Te and the cake box temperature Tf;

[0049] The cake box temperature Tf is obtained in real time, and the controller adjusts the opening of the air outlet regulating valve and the power of the heat dissipation fan until the temperature difference ΔTg1 is stable and close to 0, and then enters the insulation cycle stage.

[0050] Step 5 is the fifth stage, and the purpose of the fifth stage is to prevent the wax cake from being too hard.

[0051] Further, the step 6 comprises:

[0052] The controller closes the air outlet regulating valve and the cooling fan, and turns on the circulation fan for internal circulation;

[0053] Set the cake box temperature threshold Te, obtain the cake box temperature Tf through the second temperature sensor, calculate the temperature difference ΔTg2 between the cake box temperature threshold Te and the cake box temperature Tf, and adjust the heater power in real time according to the temperature difference ΔTg2 to ensure that ΔTg2 is stable and close to 0.

[0054] Step 6 is the sixth stage, and the function of the sixth stage is to keep the wax cake within the temperature range required for treatment.

[0055] Through the above technical solution, the beneficial effects of the present invention are:

[0056] The present invention sets 6 control stages, thereby realizing automatic production of wax cakes, avoiding the problems of uneven temperature and uneven hardness in the production of wax cakes, and improving the cake production efficiency under the premise of ensuring the quality of wax cakes. In the first stage, cold air quickly dissipates heat, thereby improving the heat dissipation speed;

[0057] In the second stage, the cold air slowly dissipates heat to prevent the wax cake from solidifying quickly and causing problems such as uneven temperature and hardness of the wax cake;

[0058] The third stage is hot air heat dissipation. Turn on the heater and apply hot air to the surface of the wax liquid to prevent the wax liquid from solidifying quickly, which is beneficial to the heat dissipation of the bottom wax liquid and the formation of wax cakes.

[0059] In the fourth stage, hot air compensation, the heat dissipation at the air inlet is faster, the wax liquid solidifies faster, and hot air compensation is performed to ensure that the overall temperature and hardness of the wax cake are uniform;

[0060] The fifth stage PID constant temperature heat dissipation dynamically adjusts the heat dissipation process to avoid the wax cake being too hard;

[0061] The sixth stage of heat preservation cycle keeps the wax cake within the required temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 A cake making box structure diagram of a control method for preparing wax cakes of a wax therapy device according to the present invention;

[0063] Figure 2 A cake making box circuit diagram of a control method for preparing wax cakes of a wax therapy apparatus according to the present invention;

[0064] Figure 3 The present invention is a method flow chart of a control method for preparing wax cakes of a wax therapy instrument.

[0065] Figure numbers: 1 is a cake box, 2 is a tray, 3 is a ventilation hole, 4 is an air duct, 5 is an exhaust channel, 6 is a circulation fan, 7 is an air outlet regulating valve, 8 is a heat dissipation fan, 9 is a heater, 10 is a first temperature sensor, 11 is a second temperature sensor, 12 is a controller, and 13 is a drive module. DETAILED DESCRIPTION

[0066] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0067] Example 1

[0068] like Figures 1 to 3 As shown, a control method for preparing wax cakes of a wax therapy instrument comprises a cake making box 1, wherein a tray 2 is arranged in the cake making box 1, a ventilation hole 3 is opened on the side of the cake making box 1, an air duct 4 is arranged on the side of the cake making box 1 corresponding to the ventilation hole 3, an exhaust channel 5 is connected to the outside of the air duct 4, a circulating fan 6 is arranged at the air inlet of the air duct 4, an air outlet regulating valve 7 is arranged on the air inlet, a heat dissipation fan 8 is arranged at the air outlet of the exhaust channel 5, a heater 9 is arranged in the air duct 4 near the circulating fan 6, a first temperature sensor 10 is arranged in the air duct 4, and a second temperature sensor 11 is arranged in the cake making box 1;

[0069] The first temperature sensor 10 and the second temperature sensor 11 are connected to a controller 12 , an output end of the controller 12 is connected to a driving module 13 , and the driving module 13 is electrically connected to the circulation fan 6 , the heat dissipation fan 8 , the air outlet regulating valve 7 and the heater 9 .

[0070] In this embodiment, the driving module 13 is an L289N driving chip, and the number of driving modules 13 is 4, which respectively control the circulating fan 6, the cooling fan 8, the air outlet regulating valve 7 and the heater 9. The circulating fan 6, the cooling fan 8, the air outlet regulating valve 7 and the heater 9 are connected to the power supply through the driving module 13 to form a loop. The controller 12 is an MCU chip, specifically including an STM32 single-chip microcomputer. The ADC pin of the controller 12 is connected to the first temperature sensor 10 and the second temperature sensor 11. The controller 12 is reserved with a communication interface to communicate with external devices.

[0071] The controller 12 is provided with a control method, which includes:

[0072] Step 1: The controller 12 enters the cold air rapid heat dissipation stage by adjusting the opening of the air outlet regulating valve 7 and the power of the heat dissipation fan 8, calculates the heat dissipation efficiency η1, and obtains the time t1 used in the cold air rapid heat dissipation stage;

[0073] Step 2: According to the heat dissipation efficiency η1, the controller 12 enters the cold air slow heat dissipation stage by adjusting the opening of the air outlet regulating valve 7 and the power of the heat dissipation fan 8, calculates the heat dissipation efficiency η2, and obtains the time t2 used in the cold air slow heat dissipation stage;

[0074] Step 3: Turn on the heater 9 through the controller 12 to enter the hot air cooling stage, calculate the cooling efficiency {η3}, use PID control to make the temperature of the incoming air relatively constant, and obtain the time t3 used in the hot air cooling stage;

[0075] Step 4: close the air outlet regulating valve 7 and the heat dissipation fan 8 through the controller 12 and open the circulation fan 6 to enter the hot air compensation stage;

[0076] Step 5: The heater 9 is stopped by the controller 12, the controller 12 adjusts the opening of the air outlet regulating valve 7 and turns on the cooling fan 8 to enter the PID constant temperature cooling stage;

[0077] Step 6: The air outlet regulating valve 7 and the heat dissipation fan 8 are closed through the controller 12, and the heater 9 is adjusted according to the temperature difference to enter the insulation circulation stage.

[0078] Example 2

[0079] Based on the above embodiment 1, steps 1 to 6 are optimized:

[0080] The step 1 comprises: the controller 12 fully opens the air outlet regulating valve 7 through the driving module 13, the heat dissipation fan 8 works at full speed, the paraffin mass m is obtained according to the size of the tray 2, the paraffin specific heat c is obtained according to the type of paraffin, the melting temperature T is known, the temperature T1 in the cake box 1 is obtained through the second temperature sensor 11, and then the temperature difference ΔTa between T and T1 is obtained;

[0081] Set the temperature threshold of cake box 1 to Tr+ΔTa, and record the time t1 taken for the temperature to change from T to Tr+ΔTa, where Tr is the melting point of paraffin wax;

[0082] According to the paraffin mass m, paraffin specific heat capacity c, temperature difference ΔT1 and time t1, the heat dissipation efficiency η1 is obtained;

[0083] In this embodiment, m = 30 kg, c = 2.5 J / (g*°C), T = 60°C, T1 = 58°C, ΔTa = 2°C, Tr = 56°C, t1 = 5 min;

[0084] ΔQ = cm ΔTa = 150 kJ;

[0085] η1=ΔQ / t1=30kJ / min.

[0086] When the detection value of the second temperature sensor 11 is the temperature threshold value Tr+ΔTa of the cake making box 1, the controller 12 enters the cold air slow heat dissipation stage.

[0087] The step 2 comprises:

[0088] The controller 12 adjusts the opening of the air outlet regulating valve 7 and the power of the heat dissipation fan 8 through the driving module 13 to adjust the wind pressure and wind speed;

[0089] Set the temperature threshold of the cake box 1 to Tr, obtain the temperature T2 in the cake box 1 through the second temperature sensor 11, and then obtain the temperature difference ΔT2 between Tr and T2, and record the time t2 taken by ΔT2 to 0,

[0090] According to the paraffin mass m, paraffin specific heat capacity c, temperature difference ΔT2 and time t1, the heat dissipation efficiency η2 is obtained;

[0091] In this embodiment, m = 30 kg, c = 2.5 J / (g*°C), t2 = 10 min, ΔT2 = 2°C;

[0092] ΔQ = cm ΔT2 = 150 kJ;

[0093] η2=ΔQ / t2=15kJ / min.

[0094] When the second temperature sensor 11 detects the temperature threshold Tr of the cake box 1, the controller 12 enters the hot air cooling stage.

[0095] The step 3 comprises:

[0096] Set the inlet air temperature difference Tb as shown in Formula 1:

[0097] Tb=al / η1+b1 / η2(1);

[0098] Among them, al and b1 are heat dissipation efficiency constants, and the air inlet temperature is Tr-Tb;

[0099] In this embodiment, a1=40, b1=20;

[0100] Tb=al / η1+b1 / η2=2.7°C;

[0101] The controller 12 adjusts the power of the heater 9 by PID control, and the temperature of the inlet air is relatively constant, and the inlet air temperature is constant at Tr-Tb, where Tr is the melting point of paraffin. Since the inlet air temperature needs stabilization time, the maximum value η'3 within 10 minutes is selected from the heat dissipation efficiency {η3};

[0102] In this embodiment, η'3 = {ΔQ / 1min}max = 10 kJ / min;

[0103] Select the maximum value η'3 within 10 minutes from the heat dissipation efficiency {η3};

[0104] Set the temperature threshold of cake box 1 to Tr-Tc, where Tc is as shown in formula 2:

[0105] Tc=a1 / n1+b1 / n2+c1 / n'3(2);

[0106] Where c1 is the heat dissipation efficiency constant;

[0107] In this embodiment, c1=10;

[0108] Tc=Tc=a1 / n1+b1 / n2+c1 / n'3=3.7℃;

[0109] Record the time t3 from Tr to Tr-Tc, and obtain the average heat dissipation efficiency η3 based on the paraffin mass m, paraffin specific heat capacity c, temperature difference Tc and time t3;

[0110] In this embodiment, if t3 = 30 min;

[0111] η3=ΔQ / t3=9.3kJ / min;

[0112] When the detection value of the second temperature sensor 11 reaches the temperature threshold Tr-Tc of the cake box 1, the controller 12 enters the hot air compensation stage.

[0113] The step 4 comprises:

[0114] Calculate the thermal compensation temperature Td, and adjust the temperature of the cake making box 1 according to the thermal compensation temperature Td. The compensation temperature Td is shown in Formula 3:

[0115] Td=a2 / n1+b2 / n1+c2 / n3(3);

[0116] Among them, a2, b2 and c2 are heat dissipation efficiency constants, and η3 is the average value of the t3 stage;

[0117] In this embodiment, a2=20, b2=10, c2=10;

[0118] Td=a2 / eta1+b2 / eta1+c2 / eta3=2.4℃;

[0119] Calculate the compensation time t4 according to formula 4:

[0120] t4=d1*(eta1*t1+eta2*t2+eta3*t3)(4);

[0121] Where d1 is the heat dissipation efficiency constant;

[0122] In this embodiment, d1=0.015;

[0123] t4=d1*(eta1*t1+eta2*t2+eta3*t3)=8.7min;

[0124] The controller 12 closes the air outlet regulating valve 7 and the cooling fan 8 and opens the circulation fan 6, and enters the PID constant temperature cooling stage after t4 time.

[0125] The step 5 comprises:

[0126] The controller 12 stops the heater 9, sets the temperature threshold Te of the cake making box 1, obtains the temperature Tf of the cake making box 1 through the second temperature sensor 11, and calculates the temperature difference ΔTg1 between the temperature threshold Te of the cake making box 1 and the temperature Tf of the cake making box 1;

[0127] The temperature Tf of the cake making box 1 is obtained in real time, and the controller 12 adjusts the opening of the air outlet regulating valve 7 and the power of the heat dissipation fan 8 until the temperature difference ΔTg1 is stable and approaches 0, and then enters the insulation cycle stage.

[0128] The step 6 comprises:

[0129] The controller 12 closes the air outlet regulating valve 7 and the heat dissipation fan 8, and opens the circulation fan 6 for internal circulation;

[0130] Set the temperature threshold Te of cake box 1, obtain the temperature Tf of cake box 1 through the second temperature sensor 11, calculate the temperature difference ΔTg2 between the temperature threshold Te of cake box 1 and the temperature Tf of cake box 1, and adjust the power of heater 9 in real time according to the temperature difference Tg2 to ensure that ΔTg2 is stable and close to 0.

[0131] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A control method for preparing wax cakes of a wax therapy instrument, comprising a cake making box (1), wherein a tray (2) is arranged in the cake making box (1), a ventilation hole (3) is opened on the side of the cake making box (1), and an air duct (4) is arranged on the side of the cake making box (1) corresponding to the ventilation hole (3), and the outer side of the air duct (4) is connected to an exhaust channel (5), characterized in that: The air inlet of the air duct (4) is provided with a circulation fan (6), the air inlet is provided with an air outlet regulating valve (7), the air outlet of the exhaust passage (5) is provided with a heat dissipation fan (8), a heater (9) is provided in the air duct (4) near the circulation fan (6), a first temperature sensor (10) is provided in the air duct (4), and a second temperature sensor (11) is provided in the cake making box (1); The first temperature sensor (10) and the second temperature sensor (11) are connected to a controller (12); an output end of the controller (12) is connected to a drive module (13); and the drive module (13) is electrically connected to a circulation fan (6), a heat dissipation fan (8), an air outlet regulating valve (7) and a heater (9); The controller (12) is provided with a control method, the control method comprising: Step 1: The controller (12) enters the cold air rapid heat dissipation stage by adjusting the opening of the air outlet regulating valve (7) and the power of the heat dissipation fan (8), calculates the heat dissipation efficiency η1, and obtains the time t1 used in the cold air rapid heat dissipation stage; Step 2: According to the heat dissipation efficiency η1, the controller (12) enters the cold air slow heat dissipation stage by adjusting the opening of the air outlet regulating valve (7) and the power of the heat dissipation fan (8), calculates the heat dissipation efficiency η2, and obtains the time t2 used in the cold air slow heat dissipation stage; Step 3: Turn on the heater (9) through the controller (12) to enter the hot air cooling stage, calculate the cooling efficiency {η3}, use PID control to make the temperature of the incoming air relatively constant, and obtain the time t3 used in the hot air cooling stage; Step 4: The air outlet regulating valve (7) and the heat dissipation fan (8) are closed by the controller (12), and the circulation fan (6) is opened to enter the hot air compensation stage; Step 5: The heater (9) is stopped by the controller (12), the controller (12) adjusts the opening of the air outlet regulating valve (7) and turns on the cooling fan (8) to enter the PID constant temperature cooling stage; Step 6: The air outlet regulating valve (7) and the heat dissipation fan (8) are closed through the controller (12), and the heater (9) is adjusted according to the temperature difference to enter the heat preservation cycle stage.

2. The control method for preparing wax cakes of a wax therapy instrument according to claim 1, characterized in that: The step 1 comprises: The controller (12) fully opens the air outlet regulating valve (7) through the driving module (13), and the heat dissipation fan (8) operates at full speed. The mass m of the paraffin wax is obtained according to the size of the tray (2), the specific heat capacity c of the paraffin wax is obtained according to the type of the paraffin wax, and the temperature T1 in the cake making box (1) is obtained through the second temperature sensor (11) when the melting temperature T of the paraffin wax is known, thereby obtaining the temperature difference ΔTa between T and T1; Set the temperature threshold of the cake box (1) to Tr+ΔTa, and record the time t1 taken for the temperature difference from T to Tr+ΔTa, where Tr is the melting point of paraffin wax; According to the paraffin mass m, paraffin specific heat capacity c, temperature difference ΔT1 and time t1, the heat dissipation efficiency η1 is obtained; When the detection value of the second temperature sensor (11) reaches the temperature threshold Tr+ΔTa of the cake making box (1), the controller (12) enters the cold air slow heat dissipation stage.

3. The control method for preparing wax cakes of a wax therapy instrument according to claim 1, characterized in that: The step 2 comprises: The controller (12) adjusts the opening of the air outlet regulating valve (7) and the power of the heat dissipation fan (8) through the driving module (13) to adjust the wind pressure and wind speed; The temperature threshold of the cake making box (1) is set to Tr, and the temperature T2 in the cake making box (1) is obtained by the second temperature sensor (11), and then the temperature difference ΔT2 between Tr and T2 is obtained, and the time t2 taken for ΔT2 to reach 0 is recorded. According to the paraffin mass m, paraffin specific heat capacity c, temperature difference ΔT2 and time t1, the heat dissipation efficiency η2 is obtained; When the detection value of the second temperature sensor (11) reaches the temperature threshold Tr of the cake making box (1), the controller (12) enters the hot air heat dissipation stage.

4. The control method for preparing wax cakes of a wax therapy instrument according to claim 1, characterized in that: The step 3 comprises: Set the inlet air temperature difference Tb as shown in formula (1): Tb=al / η1+b1 / η2(1); Among them, al and b1 are heat dissipation efficiency constants, and the air inlet temperature is Tr-Tb; The controller (12) adjusts the power of the heater (9) by means of PID control, and the temperature of the inlet air is relatively constant, and the inlet air temperature is kept constant at Tr-Tb, where Tr is the wax melting temperature. Since the inlet air temperature needs a stabilization time to be constant, the maximum value η'3 within 10 minutes is selected from the heat dissipation efficiency {η3}; The temperature threshold of the cake making box (1) is set to Tr-Tc, where Tc is as shown in formula (2): Tc=a1 / n1+b1 / n2+c1 / n'3(2); Where c1 is the heat dissipation efficiency constant; Record the time t3 from Tr to Tr-Tc, and obtain the average heat dissipation efficiency η3 based on the paraffin mass m, paraffin specific heat capacity c, temperature difference Tc and time t3; When the detection value of the second temperature sensor (11) reaches the temperature threshold value Tr-Tc of the cake making box (1), the controller (12) enters the hot air compensation stage.

5. The control method for preparing wax cakes of a wax therapy instrument according to claim 1, characterized in that: The step 4 comprises: Calculate the thermal compensation temperature Td, and adjust the temperature of the cake making box (1) according to the thermal compensation temperature Td. The compensation temperature Td is shown in formula (3): Td=a2 / n1+b2 / n1+c2 / n3(3); Among them, a2, b2 and c2 are heat dissipation efficiency constants, and η3 is the average value of the t3 stage; The compensation time t4 is calculated according to formula (4): t4=d1*(eta1*t1+eta2*t2+eta3*t3)(4); Where d1 is the heat dissipation efficiency constant; The controller (12) closes the air outlet regulating valve (7) and the cooling fan (8) and opens the circulation fan (6), and enters the PID constant temperature cooling stage after t4 time.

6. The control method for preparing wax cakes of a wax therapy instrument according to claim 1, characterized in that: The step 5 comprises: The controller (12) stops the heater (9) from working, sets a temperature threshold Te of the cake making box (1), obtains the temperature Tf of the cake making box (1) through the second temperature sensor (11), and calculates a temperature difference ΔTg1 between the temperature threshold Te of the cake making box (1) and the temperature Tf of the cake making box (1); The temperature Tf of the cake making box (1) is obtained in real time, and the controller (12) adjusts the opening of the air outlet regulating valve (7) and the power of the heat dissipation fan (8) until the temperature difference ΔTg1 is stable and approaches 0, and then enters the insulation cycle stage.

7. The control method for preparing wax cakes of a wax therapy instrument according to claim 1, characterized in that: The step 6 comprises: The controller (12) closes the air outlet regulating valve (7) and the heat dissipation fan (8), and opens the circulation fan (6) to perform internal circulation; A temperature threshold Te of the cake making box (1) is set, the temperature Tf of the cake making box (1) is obtained through a second temperature sensor (11), a temperature difference ΔTg2 between the temperature threshold Te of the cake making box (1) and the temperature Tf of the cake making box (1) is calculated, and the power of the heater (9) is adjusted in real time according to the temperature difference ΔTg2 to ensure that ΔTg2 is stable and approaches 0.

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