Heating control system capable of accurately controlling temperature

Abstract

The utility model discloses a heating control system capable of accurately controlling temperature, which belongs to the field of heating and comprises an upper heating module, a lower heating module and a temperature adjusting module. The upper heating module comprises an upper power supply starting module, an upper output control module, an upper disconnection current detection module, an upper electric heating temperature zone module and an upper temperature measurement module; the lower heating module comprises a lower power supply starting module, a lower output control module, a lower disconnection current detection module, a lower electric heating temperature zone module and a lower temperature measurement module; the upper power supply starting module comprises a first heater power supply; the lower power supply starting module comprises a second heater power supply; the temperature adjusting module comprises a temperature adjusting unit. According to the utility model, accurate temperature control can be carried out on different temperature zones, the functions of disconnection diagnosis and current abnormity detection are realized, and the safety of equipment is ensured under the condition of satisfying the use of the equipment.

Description

Technical Field

[0001] The utility model relates to the field of heating, in particular to a heating control system with precise temperature control. Background Art

[0002] Electric heaters are electrical appliances that use electricity to achieve heating. They are compact, offer high heating power, and are widely used. They utilize intelligent control modes, provide precise temperature control, and can be networked with computers. They offer a wide range of applications, long lifespans, and high reliability. The core principle behind heaters is energy conversion, the most common of which is the conversion of electrical energy into thermal energy. Electric heaters efficiently convert electrical energy into thermal energy, offering advantages such as compact size and high power, resulting in a fast and efficient heating process. Furthermore, electric heaters can achieve uniform heating across the entire object or localized heating, including surface heating, depending on the heating process requirements, thereby improving heating efficiency and product quality. Electric heating facilitates automated and remote temperature control, allowing the heated object to maintain a specific temperature distribution as required. Electric heating produces minimal exhaust, residue, and smoke, keeping the heated object clean and environmentally friendly. Furthermore, the heating element of electric heaters is typically made of a specialized alloy with excellent mechanical properties and strength, making them suitable for testing systems and accessories that operate continuously for extended periods of time.

[0003] Existing electric heaters cannot accurately control the temperature of different temperature zones, which affects the heating effect of different temperature zones. At the same time, when there are abnormal wire breaks or current abnormalities, they cannot be well regulated, affecting the safety of heating. Utility Model Content

[0004] In view of the above problems existing in the prior art, the purpose of the present invention is to provide a heating control system with precise temperature control to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A heating control system with precise temperature control, comprising an upper heating module, a lower heating module and a temperature adjustment module; the upper heating module comprises an upper power start module, an upper output control module, an upper disconnection current detection module, an upper power heating temperature zone module and an upper temperature measurement module;

[0007] The lower heating module includes a lower power start module, a lower output control module, a lower disconnection current detection module, a lower electric heating temperature zone module and a lower temperature measurement module;

[0008] The upper power startup module includes a first heater power supply, and the lower power startup module includes a second heater power supply;

[0009] The first heater power supply is connected to the input end of the first leakage circuit breaker and the input end of the second leakage circuit breaker, and the second heater power supply is connected to the input end of the third leakage circuit breaker and the input end of the fourth leakage circuit breaker;

[0010] The temperature regulating module includes a temperature regulating unit;

[0011] The upper output control module includes a first solid-state relay, a second solid-state relay, a third solid-state relay, a fourth solid-state relay, a fifth solid-state relay, and a sixth solid-state relay; the upper power startup module is electrically connected to the upper output control module, and the upper output control module is communicatively connected to the temperature adjustment module;

[0012] The upper disconnection current detection module includes a first disconnection detector, a second disconnection detector, a third disconnection detector, and a fourth disconnection detector; the upper output control module is connected to the upper disconnection current detection module, and the upper disconnection current detection module is communicatively connected to the temperature adjustment module;

[0013] The power-on heating temperature zone module includes a first heater and a second heater; the power-on heating temperature zone module is electrically connected to the upper disconnection current detection module.

[0014] The upper temperature measurement module includes a first thermocouple and a second thermocouple; the upper temperature measurement module is communicatively connected with the temperature adjustment module;

[0015] The lower output control module includes a seventh solid-state relay, an eighth solid-state relay, a ninth solid-state relay, a tenth solid-state relay, an eleventh solid-state relay, and a twelfth solid-state relay; the lower output control module is electrically connected to the lower power startup module, and the lower output control module is communicatively connected to the temperature adjustment module;

[0016] The lower disconnection current detection module includes a fifth disconnection detector, a sixth disconnection detector, a seventh disconnection detector, and an eighth disconnection detector; the lower disconnection current detection module is electrically connected to the lower output control module, and the lower disconnection current detection module is communicatively connected to the temperature adjustment module;

[0017] The lower electric heating temperature zone module includes a third heater and a fourth heater; the lower electric heating temperature zone module is electrically connected to the lower disconnection current detection module;

[0018] The lower temperature measuring module includes a third thermocouple and a fourth thermocouple; the lower temperature measuring module is communicatively connected with the temperature regulating module.

[0019] As a further solution of the present invention: the first heater power supply and the second heater power supply are both connected to an external three-phase electrical connection, and the COM terminal of the temperature adjustment unit is connected to the neutral line N.

[0020] As a further solution of the present invention: the output end of the first leakage circuit breaker is simultaneously connected to the input end of the first solid-state relay, the input end of the second solid-state relay, and the input end of the third solid-state relay;

[0021] The +A1 terminal of the first solid-state relay, the +A1 terminal of the second solid-state relay, and the +A1 terminal of the third solid-state relay are simultaneously connected to the OUT1 terminal of the temperature control unit;

[0022] The -A2 terminal of the first solid-state relay, the -A2 terminal of the second solid-state relay, and the -A2 terminal of the third solid-state relay are simultaneously connected to the first intermediate relay;

[0023] The output end of the second leakage circuit breaker is simultaneously connected to the input end of the fourth solid-state relay, the input end of the fifth solid-state relay, and the input end of the sixth solid-state relay;

[0024] The +A1 terminal of the fourth solid-state relay, the +A1 terminal of the fifth solid-state relay, and the +A2 terminal of the sixth solid-state relay are simultaneously connected to the OUT2 terminal of the temperature control unit;

[0025] The -A2 end of the fourth solid-state relay, the -A2 end of the fifth solid-state relay, and the -A2 end of the sixth solid-state relay are simultaneously connected to the second intermediate relay.

[0026] As a further solution of the present invention: the output end of the first solid-state relay is connected to the first disconnection detector; the first disconnection detector is connected to the CT1+ terminal and the CT1- terminal of the temperature control unit;

[0027] The output end of the third solid-state relay is connected to the second disconnection detector; the second disconnection detector is connected to the CT2+ terminal and CT2- terminal of the temperature control unit;

[0028] The output end of the fourth solid-state relay is connected to the third disconnection detector; the third disconnection detector is connected to the CT3+ terminal and the CT3- terminal of the temperature control unit;

[0029] The output end of the sixth solid-state relay is connected to the fourth disconnection detector; the fourth disconnection detector is connected to the CT4+ terminal and the CT4- terminal of the temperature control unit.

[0030] As a further solution of the present invention: the output end of the second solid-state relay is connected to the first heater; the output end of the fifth solid-state relay is connected to the second heater.

[0031] As a further solution of the present invention: the first thermocouple is connected to the +CH1 end and the -CH1 end of the temperature regulating unit;

[0032] The second thermocouple is connected to the +CH2 terminal and the -CH2 terminal of the temperature adjustment unit.

[0033] As a further solution of the present invention: the output end of the third leakage circuit breaker is simultaneously connected to the input end of the seventh solid-state relay, the input end of the eighth solid-state relay, and the input end of the ninth solid-state relay;

[0034] The +A1 terminal of the seventh solid-state relay, the +A1 terminal of the eighth solid-state relay, and the +A1 terminal of the ninth solid-state relay are simultaneously connected to the OUT3 terminal of the temperature control unit;

[0035] The -A2 end of the seventh solid-state relay, the -A2 end of the eighth solid-state relay, and the -A2 end of the ninth solid-state relay are simultaneously connected to the third intermediate relay;

[0036] The output end of the fourth leakage circuit breaker is simultaneously connected to the input end of the tenth solid-state relay, the input end of the eleventh solid-state relay, and the input end of the twelfth solid-state relay;

[0037] The +A1 terminal of the tenth solid-state relay, the +A1 terminal of the eleventh solid-state relay, and the +A1 terminal of the twelfth solid-state relay are simultaneously connected to the OUT4 terminal of the temperature control unit;

[0038] The -A2 end of the tenth solid-state relay, the -A2 end of the eleventh solid-state relay, and the -A2 end of the twelfth solid-state relay are simultaneously connected to the fourth intermediate relay.

[0039] As a further solution of the present invention: the output end of the seventh solid-state relay is connected to the fifth disconnection detector; the fifth disconnection detector is connected to the CT5+ terminal and the C5T- terminal of the temperature control unit;

[0040] The output end of the ninth solid-state relay is connected to the sixth disconnection detector; the sixth disconnection detector is connected to the CT6+ terminal and the CT6- terminal of the temperature control unit;

[0041] The output terminal of the tenth solid-state relay is connected to the seventh disconnection detector; the seventh disconnection detector is connected to the CT7+ terminal and the CT7- terminal of the temperature control unit;

[0042] The output end of the twelfth solid-state relay is connected to the eighth disconnection detector; the eighth disconnection detector is connected to the CT8+ terminal and the CT8- terminal of the temperature control unit.

[0043] As a further solution of the present invention: the output end of the eighth solid-state relay is connected to the first heater; the output end of the eleventh solid-state relay is connected to the second heater.

[0044] As a further solution of the present invention: the third thermocouple is connected to the +CH3 end and the -CH3 end of the temperature regulating unit;

[0045] The fourth thermocouple is connected to the +CH4 terminal and the -CH4 terminal of the temperature adjustment unit.

[0046] Compared with the prior art, the beneficial effects of the present invention are:

[0047] The utility model can accurately control the temperature of different temperature zones, and has the functions of line break diagnosis and current anomaly detection, which can meet the needs of equipment use and ensure equipment safety at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 The diagram is a circuit diagram of a heating control system with precise temperature control disclosed in an embodiment.

[0049] The accompanying drawings are marked as follows: 1. first heater power supply; 2. second heater power supply; 3. temperature control unit; 4. first leakage circuit breaker; 5. second leakage circuit breaker; 6. third leakage circuit breaker; 7. fourth leakage circuit breaker; 8. first solid-state relay; 9. second solid-state relay; 10. third solid-state relay; 11. fourth solid-state relay; 12. fifth solid-state relay; 13. sixth solid-state relay; 14. seventh solid-state relay; 15. eighth solid-state relay; 16. ninth solid-state relay; 17. tenth solid-state relay; 18. eleventh solid-state relay; 19. twelfth solid-state relay 1. a first intermediate relay; 2. a second intermediate relay; 2. a third intermediate relay; 2. a fourth intermediate relay; 2. a first disconnection detector; 2. a second disconnection detector; 2. a third disconnection detector; 2. a fourth disconnection detector; 2. a fifth disconnection detector; 2. a sixth disconnection detector; 3. a seventh disconnection detector; 3. a eighth disconnection detector; 3. a first heater; 3. a second heater; 3. a third heater; 3. a fourth heater; 3. a first thermocouple; 3. a second thermocouple; 3. a third thermocouple; 3. a fourth thermocouple. DETAILED DESCRIPTION

[0050] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention; it is obvious that the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," and "connected" should be understood in a broad sense; for example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0052] See also Figure 1 , a heating control system with precise temperature control, comprising an upper heating module, a lower heating module and a temperature regulating module;

[0053] The upper heating module includes an upper power start module, an upper output control module, an upper disconnection current detection module, an upper power heating temperature zone module and an upper temperature measurement module;

[0054] The lower heating module includes a lower power start module, a lower output control module, a lower disconnection current detection module, a lower electric heating temperature zone module and a lower temperature measurement module;

[0055] The upper power supply starting module includes a first heater power supply 1, and the lower power supply starting module includes a second heater power supply 2. Both the first heater power supply 1 and the second heater power supply 2 are connected to the external three-phase electricity; it is convenient for controlling the power supply of the device, is beneficial to the heating power supply requirements of the device, ensures safety, and facilitates the use of the device.

[0056] The first heater power supply 1 is connected to the input end of the first leakage current detector 4 and the input end of the second leakage current detector 5, and the second heater power supply 2 is connected to the input end of the third leakage current detector 6 and the input end of the fourth leakage current detector 7. The safety of the input current is ensured by the first leakage current detector 4, the second leakage current detector 5, the third leakage current detector 6, and the fourth leakage current detector 7. When the input current is abnormal, the first leakage current detector 4, the second leakage current detector 5, the third leakage current detector 6, and the fourth leakage current detector 7 disconnect the circuit and cut off the power supply, thereby ensuring the safety of the entire circuit.

[0057] The temperature regulating module includes a temperature regulating unit 3; the temperature regulating unit 3 is used to regulate the temperature of the entire system to ensure safety and facilitate the use of the device.

[0058] The upper output control module includes a first solid-state relay 8, a second solid-state relay 9, a third solid-state relay 10, a fourth solid-state relay 11, a fifth solid-state relay 12, and a sixth solid-state relay 13; the upper output control module is used to control the operation of the upper power heating temperature zone module, facilitate the use of the device, and ensure safety.

[0059] The output end of the first leakage circuit breaker 4 is simultaneously connected to the input end of the first solid-state relay 8, the input end of the second solid-state relay 9, and the input end of the third solid-state relay 10;

[0060] The +A1 terminal of the first solid-state relay 8, the +A1 terminal of the second solid-state relay 9, and the +A1 terminal of the third solid-state relay 10 are simultaneously connected to the OUT1 terminal of the temperature control unit 3;

[0061] The -A2 terminal of the first solid-state relay 8, the -A2 terminal of the second solid-state relay 9, and the -A2 terminal of the third solid-state relay 10 are simultaneously connected to the first intermediate relay 20;

[0062] The output end of the second leakage circuit breaker 5 is simultaneously connected to the input end of the fourth solid-state relay 11, the input end of the fifth solid-state relay 12, and the input end of the sixth solid-state relay 13;

[0063] The +A1 terminal of the fourth solid-state relay 11, the +A1 terminal of the fifth solid-state relay 12, and the +A1 terminal of the sixth solid-state relay 13 are simultaneously connected to the OUT2 terminal of the temperature control unit 3;

[0064] The -A2 terminal of the fourth solid-state relay 11, the -A2 terminal of the fifth solid-state relay 12, and the -A2 terminal of the sixth solid-state relay 13 are simultaneously connected to the second intermediate relay 21;

[0065] The upper disconnection current detection module includes a first disconnection detector 24, a second disconnection detector 25, a third disconnection detector 26, and a fourth disconnection detector 27; the upper disconnection current detection module is used to detect whether a circuit is broken when the upper power heating temperature zone module is working to ensure safety.

[0066] The output end of the first solid-state relay 8 is connected to the first disconnection detector 24; the first disconnection detector 24 is connected to the CT1+ terminal and the CT1- terminal of the temperature control unit 3;

[0067] The output end of the third solid-state relay 10 is connected to the second disconnection detector 25; the second disconnection detector 25 is connected to the CT2+ terminal and the CT2- terminal of the temperature control unit 3;

[0068] The output end of the fourth solid-state relay 11 is connected to the third disconnection detector 26; the third disconnection detector 26 is connected to the CT3+ terminal and the CT3- terminal of the temperature control unit 3;

[0069] The output terminal of the sixth solid-state relay 13 is connected to the fourth disconnection detector 27; the fourth disconnection detector 27 is connected to the CT4+ terminal and the CT4- terminal of the temperature control unit 3;

[0070] The power-on heating temperature zone module includes a first heater 32 and a second heater 33; the power-on heating temperature zone module is used to perform heating work;

[0071] The output end of the second solid-state relay 9 is connected to the first heater 32; the output end of the fifth solid-state relay 12 is connected to the second heater 33;

[0072] The upper temperature measurement module includes a first thermocouple 36 and a second thermocouple 37; the upper temperature measurement module is used to timely measure the working temperature of the upper electric heating temperature zone module and transmit it to the temperature adjustment unit 3 to facilitate subsequent control and ensure safety.

[0073] The first thermocouple 36 is connected to the +CH1 terminal and the -CH1 terminal of the temperature control unit 3;

[0074] The second thermocouple 37 is connected to the +CH2 terminal and the -CH2 terminal of the temperature control unit 3;

[0075] The lower output control module includes the seventh solid-state relay 14, the eighth solid-state relay 15, the ninth solid-state relay 16, the tenth solid-state relay 17, the eleventh solid-state relay 18, and the twelfth solid-state relay 19; the lower output control module is used to control the operation of the lower electric heating temperature zone module, facilitate the use of the device, and ensure safety.

[0076] The output end of the third leakage circuit breaker 6 is simultaneously connected to the input end of the seventh solid-state relay 14, the input end of the eighth solid-state relay 15, and the input end of the ninth solid-state relay 16;

[0077] The +A1 terminal of the seventh solid-state relay 14, the +A1 terminal of the eighth solid-state relay 15, and the +A1 terminal of the ninth solid-state relay 16 are simultaneously connected to the OUT3 terminal of the temperature control unit 3;

[0078] The -A2 terminal of the seventh solid-state relay 14, the -A2 terminal of the eighth solid-state relay 15, and the -A2 terminal of the ninth solid-state relay 16 are simultaneously connected to the third intermediate relay 22;

[0079] The output end of the fourth leakage circuit breaker 7 is simultaneously connected to the input end of the tenth solid-state relay 17, the input end of the eleventh solid-state relay 18, and the input end of the twelfth solid-state relay 19;

[0080] The +A1 terminal of the tenth solid-state relay 17, the +A1 terminal of the eleventh solid-state relay 18, and the +A1 terminal of the twelfth solid-state relay 19 are simultaneously connected to the OUT4 terminal of the temperature control unit 3;

[0081] The -A2 terminal of the tenth solid-state relay 17, the -A2 terminal of the eleventh solid-state relay 18, and the -A2 terminal of the twelfth solid-state relay 19 are simultaneously connected to the fourth intermediate relay 23;

[0082] The lower disconnection current detection module includes a fifth disconnection detector 28, a sixth disconnection detector 29, a seventh disconnection detector 30, and an eighth disconnection detector 31; the lower disconnection current detection module is used to detect whether a circuit breaker occurs when the lower electric heating temperature zone module is working to ensure safety.

[0083] The output terminal of the seventh solid-state relay 14 is connected to the fifth disconnection detector 28; the fifth disconnection detector 28 is connected to the CT5+ terminal and the CT5- terminal of the temperature control unit 3;

[0084] The output end of the ninth solid-state relay 16 is connected to the sixth disconnection detector 29; the sixth disconnection detector 29 is connected to the CT6+ terminal and the CT6- terminal of the temperature control unit 3;

[0085] The output terminal of the tenth solid-state relay 17 is connected to the seventh disconnection detector 30; the seventh disconnection detector 30 is connected to the CT7+ terminal and the CT7- terminal of the temperature control unit 3;

[0086] The output end of the twelfth solid-state relay 19 is connected to the eighth disconnection detector 31; the eighth disconnection detector 31 is connected to the CT8+ terminal and the CT8- terminal of the temperature control unit 3;

[0087] The lower electric heating temperature zone module includes a third heater 34 and a fourth heater 35; the lower electric heating temperature zone module is used to perform heating work;

[0088] The output end of the eighth solid-state relay 15 is connected to the first heater 32; the output end of the eleventh solid-state relay 18 is connected to the second heater 33;

[0089] The lower temperature measurement module includes a third thermocouple 38 and a fourth thermocouple 39; the lower temperature measurement module is used to timely measure the working temperature of the lower electric heating temperature zone module and transmit it to the temperature adjustment unit 3 to facilitate subsequent control and ensure safety.

[0090] The third thermocouple 38 is connected to the +CH3 terminal and the -CH3 terminal of the temperature control unit 3;

[0091] The fourth thermocouple 39 is connected to the +CH4 terminal and the −CH4 terminal of the temperature control unit 3 .

[0092] The COM terminal of the temperature control unit 3 is connected to the neutral line N. This ensures safety and facilitates the use of the device.

[0093] The utility model can accurately control the temperature of different temperature zones, and has the functions of line break diagnosis and current anomaly detection, which can meet the needs of equipment use and ensure equipment safety at the same time.

[0094] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims, not the foregoing description, and is intended to encompass all variations within the meaning and range of equivalents of the claims, and any reference numerals in the claims should not be construed as limiting the claims to which they relate.

[0095] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A heating control system with precise temperature control, characterized in that: It includes an upper heating module, a lower heating module and a temperature adjustment module; the upper heating module includes an upper power start module, an upper output control module, an upper disconnection current detection module, an upper power heating temperature zone module and an upper temperature measurement module; The lower heating module includes a lower power start module, a lower output control module, a lower disconnection current detection module, a lower electric heating temperature zone module and a lower temperature measurement module; The upper power supply starting module includes a first heater power supply (1), and the lower power supply starting module includes a second heater power supply (2); The first heater power supply (1) is connected to the input end of the first leakage circuit device (4) and the input end of the second leakage circuit device (5), and the second heater power supply (2) is connected to the input end of the third leakage circuit device (6) and the input end of the fourth leakage circuit device (7); The temperature regulating module includes a temperature regulating unit (3); The upper output control module includes a first solid-state relay (8), a second solid-state relay (9), a third solid-state relay (10), a fourth solid-state relay (11), a fifth solid-state relay (12), and a sixth solid-state relay (13); the upper power startup module is electrically connected to the upper output control module, and the upper output control module is communicatively connected to the temperature adjustment module; The upper disconnection current detection module includes a first disconnection detector (24), a second disconnection detector (25), a third disconnection detector (26), and a fourth disconnection detector (27); the upper output control module is communicatively connected to the upper disconnection current detection module, and the upper disconnection current detection module is communicatively connected to the temperature adjustment module; The power-on heating temperature zone module includes a first heater (32) and a second heater (33); the power-on heating temperature zone module is electrically connected to the upper disconnection current detection module. The upper temperature measurement module includes a first thermocouple (36) and a second thermocouple (37); the upper temperature measurement module is communicatively connected to the temperature regulation module; The lower output control module includes a seventh solid-state relay (14), an eighth solid-state relay (15), a ninth solid-state relay (16), a tenth solid-state relay (17), an eleventh solid-state relay (18), and a twelfth solid-state relay (19); the lower output control module is electrically connected to the lower power start module, and the lower output control module is communicatively connected to the temperature adjustment module; The lower disconnection current detection module includes a fifth disconnection detector (28), a sixth disconnection detector (29), a seventh disconnection detector (30), and an eighth disconnection detector (31); the lower disconnection current detection module is electrically connected to the lower output control module, and the lower disconnection current detection module is communicatively connected to the temperature adjustment module; The lower electric heating temperature zone module includes a third heater (34) and a fourth heater (35); the lower electric heating temperature zone module is electrically connected to the lower disconnection current detection module; The lower temperature measurement module comprises a third thermocouple (38) and a fourth thermocouple (39); the lower temperature measurement module is communicatively connected to the temperature regulation module.

2. A heating control system with precise temperature control according to claim 1, characterized in that: The first heater power supply (1) and the second heater power supply (2) are both connected to an external three-phase power supply, and the COM terminal of the temperature adjustment unit (3) is connected to the neutral line N.

3. A heating control system with precise temperature control according to claim 2, characterized in that: The output end of the first leakage circuit breaker (4) is simultaneously connected to the input end of the first solid-state relay (8), the input end of the second solid-state relay (9), and the input end of the third solid-state relay (10); The +A1 terminal of the first solid-state relay (8), the +A1 terminal of the second solid-state relay (9), and the +A1 terminal of the third solid-state relay (10) are simultaneously connected to the OUT1 terminal of the temperature control unit (3); The -A2 terminal of the first solid-state relay (8), the -A2 terminal of the second solid-state relay (9), and the -A2 terminal of the third solid-state relay (10) are simultaneously connected to the first intermediate relay (20); The output end of the second leakage circuit breaker (5) is simultaneously connected to the input end of the fourth solid-state relay (11), the input end of the fifth solid-state relay (12), and the input end of the sixth solid-state relay (13); The +A1 terminal of the fourth solid-state relay (11), the +A1 terminal of the fifth solid-state relay (12), and the +A1 terminal of the sixth solid-state relay (13) are simultaneously connected to the OUT2 terminal of the temperature control unit (3); The -A2 end of the fourth solid-state relay (11), the -A2 end of the fifth solid-state relay (12), and the -A2 end of the sixth solid-state relay (13) are simultaneously connected to the second intermediate relay (21).

4. A heating control system with precise temperature control according to claim 3, characterized in that: The output end of the first solid-state relay (8) is connected to the first disconnection detector (24); the first disconnection detector (24) is connected to the CT1+ end and the CT1- end of the temperature control unit (3); The output end of the third solid-state relay (10) is connected to the second disconnection detector (25); the second disconnection detector (25) is connected to the CT2+ terminal and the CT2- terminal of the temperature control unit (3); The output end of the fourth solid-state relay (11) is connected to the third disconnection detector (26); the third disconnection detector (26) is connected to the CT3+ terminal and the CT3- terminal of the temperature control unit (3); The output end of the sixth solid-state relay (13) is connected to the fourth disconnection detector (27); the fourth disconnection detector (27) is connected to the CT4+ end and the CT4- end of the temperature adjustment unit (3).

5. A heating control system with precise temperature control according to claim 4, characterized in that: The output end of the second solid-state relay (9) is connected to the first heater (32); and the output end of the fifth solid-state relay (12) is connected to the second heater (33).

6. A heating control system with precise temperature control according to claim 5, characterized in that: The first thermocouple (36) is connected to the +CH1 end and the -CH1 end of the temperature adjustment unit (3); The second thermocouple (37) is connected to the +CH2 end and the -CH2 end of the temperature adjustment unit (3).

7. A heating control system with precise temperature control according to claim 6, characterized in that: The output end of the third leakage circuit breaker (6) is simultaneously connected to the input end of the seventh solid-state relay (14), the input end of the eighth solid-state relay (15), and the input end of the ninth solid-state relay (16); The +A1 terminal of the seventh solid-state relay (14), the +A1 terminal of the eighth solid-state relay (15), and the +A1 terminal of the ninth solid-state relay (16) are simultaneously connected to the OUT3 terminal of the temperature control unit (3); The -A2 terminal of the seventh solid-state relay (14), the -A2 terminal of the eighth solid-state relay (15), and the -A2 terminal of the ninth solid-state relay (16) are simultaneously connected to the third intermediate relay (22); The output end of the fourth leakage circuit breaker (7) is simultaneously connected to the input end of the tenth solid-state relay (17), the input end of the eleventh solid-state relay (18), and the input end of the twelfth solid-state relay (19); The +A1 terminal of the tenth solid-state relay (17), the +A1 terminal of the eleventh solid-state relay (18), and the +A1 terminal of the twelfth solid-state relay (19) are simultaneously connected to the OUT4 terminal of the temperature control unit (3); The -A2 end of the tenth solid-state relay (17), the -A2 end of the eleventh solid-state relay (18), and the -A2 end of the twelfth solid-state relay (19) are simultaneously connected to the fourth intermediate relay (23).

8. The precise temperature control heating control system according to claim 7, characterized in that: The output end of the seventh solid-state relay (14) is connected to the fifth disconnection detector (28); the fifth disconnection detector (28) is connected to the CT5+ terminal and the CT5- terminal of the temperature control unit (3); The output end of the ninth solid-state relay (16) is connected to the sixth disconnection detector (29); the sixth disconnection detector (29) is connected to the CT6+ terminal and the CT6- terminal of the temperature control unit (3); The output terminal of the tenth solid-state relay (17) is connected to the seventh disconnection detector (30); the seventh disconnection detector (30) is connected to the CT7+ terminal and the CT7- terminal of the temperature control unit (3); The output end of the twelfth solid-state relay (19) is connected to the eighth disconnection detector (31); the eighth disconnection detector (31) is connected to the CT8+ terminal and the CT8- terminal of the temperature control unit (3).

9. The precise temperature control heating control system according to claim 8, characterized in that: The output end of the eighth solid-state relay (15) is connected to the first heater (32); the output end of the eleventh solid-state relay (18) is connected to the second heater (33).

10. The precise temperature control heating control system according to claim 9, characterized in that: The third thermocouple (38) is connected to the +CH3 terminal and the -CH3 terminal of the temperature adjustment unit (3); The fourth thermocouple (39) is connected to the +CH4 terminal and the -CH4 terminal of the temperature adjustment unit (3).

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