CN214598799U - Temperature control system of reaction kettle - Google Patents

Abstract

The utility model relates to a reation kettle temperature control system belongs to the field of chemical industry equipment, and it includes the cauldron body, and the internal stirring chamber that has seted up of cauldron is equipped with agitating unit in the stirring chamber, and the upper surface of the cauldron body rotates and is connected with the rotary disk, a plurality of feeder hoppers of fixedly connected with on the rotary disk, the bottom fixedly connected with inlet pipe of feeder hopper, the inlet pipe runs through the rotary disk and extends to the stirring intracavity. This application has the time that reduces various batching misce benes and spend, improves work efficiency's effect.

Description

Temperature control system of reaction kettle

Technical Field

The application relates to the field of chemical equipment, in particular to a temperature control system of a reaction kettle.

Background

The paint is a common dye, and the paint production process usually needs to be carried out batching to the paint of various colours is prepared, and the batching carries out the in-process of mixing stirring, usually needs to go on in reation kettle, applys certain temperature to reation kettle simultaneously, guarantees that the batching can intensive mixing.

In the related technology, reference may be made to chinese patent with publication No. CN211645356U, which discloses a reaction kettle, comprising a kettle body, a kettle cover, and a stirring device, wherein a reaction chamber is arranged inside the kettle body, and a material inlet and a material outlet are arranged on the kettle cover.

To the correlation technique among the above-mentioned, the inventor thinks that the batching kind of paint is more, and various batching usually adds to the reaction chamber in proper order through material import and export, and all batching can be piled up the position that the bottom of reaction chamber is close to the material import and export, and agitating unit will stir the even time of spending of batching longer, and work efficiency is low.

SUMMERY OF THE UTILITY MODEL

In order to reduce the time that various ingredients were mixed and are evenly spent, improve work efficiency, this application provides a reation kettle temperature control system.

The application provides a reation kettle temperature control system adopts following technical scheme:

the utility model provides a reation kettle temperature control system, includes the cauldron body, the internal stirring chamber that has seted up of cauldron, the stirring intracavity is equipped with agitating unit, the upper surface of the cauldron body rotates and is connected with the rotary disk, a plurality of feeder hoppers of fixedly connected with on the rotary disk, the bottom fixedly connected with inlet pipe of feeder hopper, the inlet pipe runs through the rotary disk and extends to the stirring intracavity.

Through adopting above-mentioned technical scheme, the user adds different feedhoppers with the batching of difference, then the rotary disk rotates, and the batching enters into the stirring intracavity from the inlet pipe, then agitating unit stirs the batching, can be with the comparatively even distribution of batching stirring intracavity, and the stirring is convenient, can reduce the time that various batching misce benes spent, improves work efficiency.

Optionally, the lateral wall fixedly connected with of the cauldron body is a plurality of and is located the board of taking of stirring the intracavity, take the board along the circumference evenly distributed of the cauldron body, take the board along the direction of height staggered distribution of the cauldron body.

Through adopting above-mentioned technical scheme, the rotary disk rotates the in-process, and partial batching falls into to connect and gets on the board, can further reduce the batching and pile up the possibility of same position, adds solution stirring in-process in the stirring chamber, can make the batching faster mix with solution, further improves work efficiency.

Optionally, be equipped with the disk in the inlet pipe, the diameter of disk equals the diameter of inlet pipe, the lateral wall of disk is along the radius direction fixedly connected with regulation pole of disk, the lateral wall of inlet pipe is worn out to establish by the regulation pole, it is connected with the perpendicular rotation of inlet pipe to adjust the pole.

Through adopting above-mentioned technical scheme, the user rotates the regulation pole and then drives the disk and rotate, and then adjusts the size in the gap between disk and the inlet pipe, can adjust the speed that the batching falls into in the stirring chamber, can make the mixture between the batching more even.

Optionally, the lateral wall fixedly connected with limiting plate of the one end that the disk was kept away from to the regulation pole, the arc wall has been seted up to the limiting plate, the lateral wall fixedly connected with of inlet pipe and the gag lever post of adjusting the pole parallel, gag lever post sliding connection is in the arc wall, the length direction that the arc wall can be followed to the gag lever post slides, the one end threaded connection that the inlet pipe was kept away from to the gag lever post has the nut, the nut can contradict with the limiting plate.

Through adopting above-mentioned technical scheme, the user rotates the regulation pole time the stopper pole rotates in the arc wall, and then adjusts the angle of disk, then rotates the nut and makes the nut be close to the limiting plate, and then carries on spacingly to the limiting plate to guarantee the stability of regulation pole, guarantee the stability of disk angle, and then guarantee the stability of batching whereabouts, guarantee the effect of stirring.

Optionally, the limiting rod is fixedly connected with a baffle abutting against the limiting plate, and the limiting plate is located between the baffle and the nut.

Through adopting above-mentioned technical scheme, baffle and nut mutually support and press from both sides the limiting plate tightly, guarantee the stability of limiting plate, further guarantee the stable in position of disc, further guarantee the effect of stirring.

Optionally, heating wires are embedded in the inner wall of the kettle body.

Through adopting above-mentioned technical scheme, the heater strip can heat the cauldron body, improves the mixing efficiency of batching.

Optionally, a temperature control circuit is arranged on the kettle body, and the temperature control circuit comprises a first sensing module and a control module;

the first induction module comprises a button switch fixedly arranged on the side wall of the kettle body, and when the button switch is switched on, the induction module outputs an induction current signal;

the control module responds to the induction current signal and controls the heating wire to heat when the control module receives the induction current signal; and when the control module does not receive the induction current signal, controlling the heating wire to stop heating.

Through adopting above-mentioned technical scheme, when needing the heating, the user switches on button switch, and first response module switches on and sends induced-current signal, and control module responds induced-current signal and switches on, and control module control heater strip heats, and when need not heat, the user breaks off button switch, and the heater strip stops heating this moment, convenient operation.

Optionally, the temperature control circuit further includes a second sensing module, a first comparing module and a second comparing module;

the second induction module comprises a temperature sensor fixedly arranged on the inner wall of the stirring cavity, and when the temperature sensor senses the temperature change in the stirring cavity, the second induction module sends a comparative current signal;

the first comparison module responds to a comparison current signal sent by the second induction module, compares the comparison current signal with a preset reference value of the first comparison module, and outputs a stop current signal when the comparison current signal is greater than the preset reference value of the first comparison module;

the second comparison module responds to a comparison current signal sent by the second induction module, compares the comparison current signal with a preset reference value of the second comparison module, and outputs a heating current signal when the comparison current signal is smaller than the preset reference value of the second comparison module;

the control module responds to the stopping current signal and the heating current signal, and controls the heating wire to stop heating when the control module receives the stopping current signal; when the control module receives the heating current signal, the heating wire is controlled to heat.

Through adopting above-mentioned technical scheme, when temperature sensor detected the temperature variation, send comparative current signal, when comparative current signal is less than the preset reference value of second comparison module, the second comparison module output heating current signal, control module switch-on control heater strip heating this moment, when comparative current signal is greater than the preset reference value of first comparison module, first comparison module output stop current signal, control module disconnection this moment, the heater strip stops the heating, can guarantee that the temperature of cauldron body heating is comparatively stable, guarantee the heating effect, and can realize the self-heating to the cauldron body, and convenient operation.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through the arrangement of the rotating disc, the feeding hopper and the feeding pipe, ingredients are added into the feeding hopper and then enter the stirring cavity from the feeding pipe, and meanwhile, the ingredients can be uniformly paved at the bottom end of the stirring cavity when the rotating disc rotates, so that the stirring is convenient, the time spent on uniformly mixing various ingredients can be reduced, and the working efficiency is improved;

2. through the arrangement of the access plate, the possibility of accumulation of ingredients can be further reduced, the ingredients can be conveniently mixed, and the working efficiency is further improved;

3. through the setting of heater strip, conveniently heat the cauldron body for the mixing speed between the batching improves stirring efficiency.

Drawings

FIG. 1 is a schematic cross-sectional view of an embodiment of the present application;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

FIG. 3 is a circuit diagram highlighting a first sensing module and a control module in an embodiment of the present application;

fig. 4 is a schematic circuit diagram highlighting a first comparison module and a second module in the embodiment of the present application.

Description of reference numerals: 1. a kettle body; 11. a stirring chamber; 12. a water inlet pipe; 13. a discharge pipe; 14. heating wires; 2. a stirring device; 21. a stirring motor; 22. a stirring shaft; 23. stirring blades; 3. receiving a plate; 31. an upper plate; 32. a lower plate; 4. rotating the disc; 41. gear teeth; 42. a rotating electric machine; 43. a gear; 44. a feed hopper; 5. a feed pipe; 51. a wafer; 52. adjusting a rod; 53. a limiting plate; 54. an arc-shaped slot; 55. a limiting rod; 56. a nut; 57. a baffle plate; 6. a first sensing module; 61. a push button switch; 7. a control module; 8. a second sensing module; 9. a first comparison module; 10. and a second comparison module.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses a reaction kettle temperature control system. Referring to fig. 1, the reaction kettle temperature control system comprises a cylindrical kettle body 1, wherein a stirring cavity 11 is formed in the kettle body 1, the stirring cavity 11 is coaxially formed along the axial direction of the kettle body 1, and a stirring device 2 is arranged in the stirring cavity 11. The upper surface of the kettle body 1 is provided with a plurality of feed hoppers 44, the feed hoppers 44 are communicated with the stirring cavity 11, the upper surface of the kettle body 1 is fixedly connected with a water inlet pipe 12, and the lower surface of the kettle body 1 is fixedly connected with a water outlet pipe. The method is characterized in that ingredients are added into a feed hopper 44, the ingredients are added into a stirring cavity 11 from the feed hopper 44, then solution is injected into a water inlet pipe 12 while stirring is carried out by a stirring device 2, and after the stirring is finished, liquid is discharged from a discharge pipe 13 and collected.

Referring to fig. 1, the stirring device 2 includes a stirring shaft 22, a stirring blade 23, and a stirring motor 21. Stirring motor 21 fixed connection has been seted up in the lower surface of the cauldron body 1 and has rotated the groove, and (mixing) shaft 22 rotates to be connected in rotating the groove, and (mixing) shaft 22 is coaxial with the cauldron body 1. The output shaft of stirring motor 21 wears to establish the lower surface of the cauldron body 1 and with the coaxial fixed connection of (mixing) shaft 22, stirring leaf 23 is located stirring chamber 11, and sets firmly in the lateral wall of (mixing) shaft 22. In the stirring process, the stirring motor 21 is started to drive the stirring shaft 22 to rotate, and the stirring shaft 22 drives the stirring blade 23 to rotate, so that the ingredients and the solution in the stirring cavity 11 are stirred.

Referring to fig. 1, a heating groove is formed in the side wall of the kettle body 1, the heating groove is spirally arranged around the side wall of the kettle body 1, and a heating wire 14 is arranged in the heating cavity in a clamping manner. Batching and solution carry out the in-process of stirring, heater strip 14 heats the cauldron body 1, and then improves the temperature of the cauldron body 1, can accelerate the mixture of batching and solution, improves the efficiency of mixing.

Referring to fig. 1, a feeding pipe 5 is fixedly connected to a lower surface of the feeding hopper 44, a top end of the feeding pipe 5 penetrates through the lower surface of the feeding hopper 44, and a lower surface of the discharging pipe 13 extends into the stirring chamber 11. After the ingredients have been added to the feed end, the ingredients are added from the feed pipe 5 to the stir chamber 11.

Referring to fig. 1 and 2, a circular rotary hole is formed in the upper surface of the kettle body 1, and a circular rotary disk 4 is coaxially and rotatably connected in the rotary hole. The feed pipe 5 extends through the rotating disc 4 and into the stirring chamber 11. After different feeder hoppers 44 were added to different batching, rotary disk 4 rotated and drives inlet pipe 5 and rotate, and then driven feeder hopper 44 and rotate in step, and then made the even unrestrained bottom to stirring chamber 11 of batching, made the more even of mixing between the batching, can reduce the time that various batching misce benes spent, improved work efficiency.

Referring to fig. 1 and 2, a plurality of gear teeth 41 are fixedly connected to a sidewall of the rotating disk 4, and the gear teeth 41 are uniformly distributed along a circumferential direction of the rotating disk 4. The upper surface of the kettle body 1 is fixedly connected with a rotating motor 42, an output shaft of the rotating motor 42 is coaxially and fixedly connected with a gear 43, and the gear 43 is meshed with the gear teeth 41. In the working process, the rotating motor 42 is started to rotate to drive the gear 43 to rotate, the gear 43 drives the gear teeth 41 to further drive the rotating disk 4 to rotate, and the operation is convenient.

Referring to fig. 1 and 2, the side wall of the kettle body 1 is fixedly connected with a plurality of receiving plates 3, the receiving plates 3 are located in the stirring cavity 11, and the receiving plates 3 are uniformly distributed along the circumferential direction of the side wall of the kettle body 1. The rotary disk 4 rotates the in-process, can fall into partial batching and take over board 3 on, can disperse the batching, reduces the batching and takes place accumulational possibility, and then can make the better and solution of batching contact the mixture, reduces the time of mixing, guarantees the efficiency of mixing.

Referring to fig. 1, the receiving plate 3 includes an upper plate 31 and a lower plate 32, the upper plate 31 is uniformly distributed along the height direction of the autoclave body 1, the lower plate 32 is uniformly distributed along the height direction of the autoclave body 1, and the distance between the upper plate 31 and the inner wall of the autoclave body 1 increases from top to bottom. Simultaneously upper plate 31 and lower board 32 crisscross distribution, when the batching falls into on the upper plate 31 and the lower board 32 of the top, when the batching is too much on upper plate 31 and the lower board 32, the batching can be from top to bottom fall into on the upper plate 31 and the lower board 32 of below in order, and then can further disperse the batching, can make the area of contact of increase batching and solution, further reduce the time of mixing, improve the efficiency of mixing.

With reference to fig. 1 and 2, the feed pipe 5 is cylindrical and the feed pipe 5 is provided with a disc 51, the diameter of the disc 51 being equal to the diameter of the feed pipe 5. An adjusting rod 52 is fixedly connected to the side wall of the wafer 51, and the adjusting rod 52 is arranged along the radial direction of the wafer 51 and penetrates through the side wall of the feed pipe 5. The adjusting rod 52 is rotatably connected with the feeding pipe 5, and the adjusting rod 52 is perpendicular to the feeding pipe 5. The user is through rotating adjusting pole 52, and then adjusts pole 52 and drive disk 51 and rotate, and then can adjust the size in clearance between disk 51 and the inlet pipe 5 to adjust the speed that the batching enters into stirring chamber 11, make things convenient for the more abundant that the batching mixes.

Referring to fig. 2, a limit plate 53 is fixedly connected to a side wall of the adjusting rod 52 at an end away from the wafer 51, and the limit plate 53 is located outside the feeding pipe 5. The lateral wall fixedly connected with gag lever post 55 of inlet pipe 5, gag lever post 55 is parallel with regulation pole 52, and has seted up arc groove 54 on the limiting plate 53, and gag lever post 55 sliding connection is in arc groove 54, and the radius of arc groove 54 equals the distance between gag lever post 55 and regulation pole 52. When the user rotates the adjusting lever 52, the limiting plate 53 is driven to rotate, so that the limiting rod 55 slides in the arc-shaped groove 54 along the length direction of the arc-shaped groove 54, and the rotating stability of the adjusting lever 52 is ensured.

Referring to fig. 2, one end of the limiting rod 55, which is far away from the feeding pipe 5, is provided with an external thread, and meanwhile, the limiting rod 55 is connected with a nut 56 through a thread, and the nut 56 is located on one side of the limiting plate 53, which is far away from the feeding pipe 5. When adjusting pole 52 and rotating suitable position, the user rotates nut 56, makes nut 56 be close to limiting plate 53, and then increases the frictional force between nut 56 and the limiting plate 53, and then guarantees the stability of limiting plate 53 position to guarantee to adjust the stability of pole 52 position, and then guarantee the stability of disk 51 position, guarantee the speed stability of batching whereabouts, guarantee that the mixture of batching is comparatively even.

Referring to fig. 2, a baffle 57 is fixedly connected to the limiting rod 55, the baffle 57 and the limiting plate 53 are abutted against each other, and the limiting plate 53 is located between the baffle 57 and the nut 56. Baffle 57 can carry out spacingly to limiting plate 53, reduces nut 56 and carries out spacing in-process to limiting plate 53, and limiting plate 53 takes place the possibility of deformation, guarantees limiting plate 53's spacing effect.

Referring to fig. 1 and 3, a temperature control circuit is arranged on the kettle body 1, and the temperature control circuit includes a first sensing module 6 and a control module 7.

The first induction module 6 comprises a button switch 61 fixedly arranged on the kettle body 1, one end of the button switch 61 is electrically connected with a power VCC, the other end of the button switch 61 is electrically connected with a normally closed switch KA1-1 of the cooling induction relay, the other end of the normally closed switch KA1-1 of the cooling induction relay is electrically connected with a normally open switch KA2-1 of the warming induction relay, the other end of the normally open switch KA2-1 of the warming induction relay is electrically connected with an electromagnetic coil KA3 of the heating induction relay, the other end of the electromagnetic coil KA3 of the heating induction relay is electrically connected with a third resistor R3, and the other end of the third resistor R3 is grounded.

The control module 7 comprises a heating wire 14, one end of the heating wire 14 is electrically connected with a normally open switch KA3-1 of the heating induction relay, and the heating wire 14 and the normally open switch KA3-1 of the heating induction relay are jointly connected in parallel at two ends of the button switch 61 and the third resistor R3.

When heating is needed, a user switches on the button switch 61, the button switch 61 is closed, the normally closed switch KA1-1 of the cooling induction relay is closed, the normally open switch KA2-1 of the heating induction relay is closed, the electromagnetic coil KA3 of the heating induction relay is electrified and conducted, the normally open switch KA3-1 of the heating induction relay is closed, and the heating wire 14 is electrified to heat the kettle body 1.

Referring to fig. 3 and 4, the temperature control circuit further includes a second sensing module 8, a first comparing module 9, and a second comparing module 10.

The second sensing module 8 comprises a temperature sensor T fixedly arranged on the inner wall of the stirring cavity 11.

The first comparison module 9 comprises a comparator T1 electrically connected with a temperature sensor T, the temperature sensor T is electrically connected with the positive electrode of a comparator T1, the output end of a comparator T1 is electrically connected with a triode Q1, the output end of the comparator T1 is electrically connected with the base electrode of a triode Q1, the collector electrode of a triode Q1 is electrically connected with a first resistor R1, the other end of the first resistor R1 is electrically connected with a power supply VCC, and the emitter electrode of a triode Q1 is electrically connected with an electromagnetic coil KA1 of the temperature reduction induction relay.

The second comparing module 10 comprises a comparator T2 electrically connected with the temperature sensor T, and the temperature sensor T is electrically connected with the negative electrode of the comparator T2, the output end of the comparator T2 is electrically connected with a triode Q2, the output end of the comparator T2 is electrically connected with the base electrode of a triode Q2, the collector electrode of a triode Q2 is electrically connected with a second resistor R2, the other end of the second resistor R2 is electrically connected with a power supply VCC, and the emitter electrode of a triode Q2 is electrically connected with an electromagnetic coil KA2 of the warming induction relay.

In the temperature adjusting process, when the temperature of the kettle body 1 is lower, the temperature sensor T senses the temperature in the kettle body 1, the second sensing module 8 sends a comparison current signal, the first comparison module 9 and the second comparison module 10 respond to the comparison current signal sent by the second sensing module 8 and compare the comparison current signal with a preset reference value Verf1 of the comparator T1 and a preset reference value Verf2 of the comparator T2 at the same time, the preset reference value Verf2 of the comparator T2 is larger than the preset reference value Verf1 of the comparator T1, when the comparison current signal is smaller than the preset reference value Verf1 of the comparator T1, the comparison current signal is smaller than the preset reference value Verf2 of the comparator T2 at the same time, the electromagnetic coil KA2 of the temperature-increasing sensing relay is powered on, the second comparison module 10 outputs a heating current signal, at the time, the KA normally closed 1-1 of the temperature-reducing sensing relay is closed, the KA 84-1 of the normally open KA is closed, and the heating wire 14 is electrified for heating.

After the temperature rises, temperature sensor T feels the temperature in the cauldron body 1, second response module 8 sends comparative current signal again, when comparative current signal is greater than the preset reference value Verf2 of comparator T2, cooling induction relay's solenoid KA1 circular telegram is switched on this moment, first comparison module 9 outputs stop current signal, cooling induction relay's normally closed switch KA1-1 disconnection this moment, heating induction relay's solenoid KA3 loses the electricity disconnection, heating induction relay's normally open switch KA3-1 disconnection, heater strip 14 loses the electricity and stops heating this moment, and then guarantee the internal temperature stability of cauldron, it is comparatively convenient to operate.

The implementation principle of a reaction kettle temperature control system in the embodiment of the application is as follows: the user adds the batching into feeder hopper 44, then rotates the angle that adjusts pole 52 and adjust disk 51, after the regulation is accomplished, swivel nut 56 is spacing to adjusting pole 52, then add solution into stirring chamber 11 from inlet tube 12, start agitator motor 21 and rotating electrical machines 42 simultaneously, agitator motor 21 drives (mixing) shaft 22 and stirring leaf 23 and stirs, rotating electrical machines 42 drives rotary disk 4 and rotates, after the stirring is accomplished, discharge the liquid of mixing from discharging pipe 13.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (7)

1. The utility model provides a reation kettle temperature control system, includes the cauldron body (1), set up stirring chamber (11) in the cauldron body (1), be equipped with agitating unit (2), its characterized in that in stirring chamber (11): the upper surface of the cauldron body (1) rotates and is connected with rotary disk (4), a plurality of feeder hoppers (44) of fixedly connected with are gone up in rotary disk (4), the bottom fixedly connected with inlet pipe (5) of feeder hopper (44), inlet pipe (5) run through rotary disk (4) and extend to in stirring chamber (11), the board (3) are got in a plurality of connecing that are located stirring chamber (11) of the lateral wall fixedly connected with of the cauldron body (1), connect and get the circumference evenly distributed of board (3) along the cauldron body (1), connect and get the crisscross distribution of direction of height of board (3) along the cauldron body (1).

2. The reactor temperature control system of claim 1, wherein: be equipped with disk (51) in inlet pipe (5), the diameter of disk (51) equals the diameter of inlet pipe (5), the lateral wall of disk (51) is along the radius direction fixedly connected with regulation pole (52) of disk (51), adjust the lateral wall that inlet pipe (5) were worn out to establish in pole (52), it is connected with inlet pipe (5) vertical rotation to adjust pole (52).

3. The reactor temperature control system of claim 2, wherein: adjust pole (52) and keep away from lateral wall fixedly connected with limiting plate (53) of the one end of disk (51), arc wall (54) have been seted up in limiting plate (53), the lateral wall fixedly connected with of inlet pipe (5) and adjusting gag lever post (55) that pole (52) are parallel, gag lever post (55) sliding connection is in arc wall (54), the length direction that arc wall (54) can be followed in gag lever post (55) slides, the one end threaded connection who inlet pipe (5) are kept away from in gag lever post (55) has nut (56), nut (56) can contradict with limiting plate (53).

4. The reactor temperature control system of claim 3, wherein: the limiting rod (55) is fixedly connected with a baffle (57) abutted to the limiting plate (53), and the limiting plate (53) is located between the baffle (57) and the nut (56).

5. The reactor temperature control system of claim 1, wherein: the inner wall of the kettle body (1) is embedded with a heating wire (14).

6. The reactor temperature control system of claim 5, wherein: the kettle body (1) is provided with a temperature control circuit, and the temperature control circuit comprises a first induction module (6) and a control module (7);

the first induction module (6) comprises a button switch (61) fixedly arranged on the side wall of the kettle body (1), and when the button switch (61) is switched on, the induction module outputs an induction current signal;

the control module (7) responds to the induction current signal, and when the control module (7) receives the induction current signal, the heating wire (14) is controlled to be heated; when the control module (7) does not receive the induction current signal, the heating wire (14) is controlled to stop heating.

7. The reactor temperature control system of claim 6, wherein: the temperature control circuit further comprises a second sensing module (8), a first comparison module (9) and a second comparison module (10);

the second induction module (8) comprises a temperature sensor fixedly arranged on the inner wall of the stirring cavity (11), and when the temperature sensor senses the temperature change in the stirring cavity (11), the second induction module (8) sends a comparative current signal;

the first comparison module (9) responds to a comparison current signal sent by the second induction module (8), compares the comparison current signal with a preset reference value of the first comparison module (9), and when the comparison current signal is greater than the preset reference value of the first comparison module (9), the first comparison module (9) outputs a stop current signal;

the second comparison module (10) responds to a comparison current signal sent by the second induction module (8), compares the comparison current signal with a preset reference value of the second comparison module (10), and outputs a heating current signal when the comparison current signal is smaller than the preset reference value of the second comparison module (10);

the control module (7) responds to the stop current signal and the heating current signal, and controls the heating wire (14) to stop heating when the control module (7) receives the stop current signal; when the control module (7) receives the heating current signal, the heating wire (14) is controlled to heat.

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