CN220123096U - Explosion-proof heating device - Google Patents

Abstract

The utility model relates to the field of chemical reaction heating equipment, in particular to an explosion-proof heating device, which comprises a shell, wherein an accommodating cavity which is outwards opened is arranged at the top of the shell, a heating coil is arranged below the accommodating cavity, the accommodating cavity is made of metal, and the accommodating cavity and the shell are integrally formed; an explosion-proof structure is arranged outside the heating coil, so that explosion caused by tiny electric sparks is prevented.

Description

Explosion-proof heating device

Technical Field

The utility model relates to the field of chemical reaction heating equipment, in particular to an explosion-proof heating device.

Background

The electric jacket is a chemical reaction heating instrument, the structure comprises a shell, a containing cavity is formed in the upper portion of the shell, a heating coil is arranged below the containing cavity, the heating coil is electrically connected with a controller, and the electric jacket is used for directly heating a round-bottom flask.

The electric heating sleeve in the prior art has the defects that the material of the accommodating cavity is asbestos gauze, and when the conditions of reactant overflow, flask explosion and the like occur in chemical reaction, substances in the flask can leak to the heating coil through the asbestos gauze to cause short circuit and corrosion.

In order to solve the above-mentioned problems, CN202121097364.8 proposes a replaceable electric heating jacket protecting cover, and a detachable protecting cover is additionally installed on the accommodating cavity to prevent the leaked substances from polluting the heating coil;

CN 201620838782.0 proposes a new type of electric jacket, and proposes a heat conducting material and a lining with protection function in turn on the containing cavity, which can prevent the leaked substances from polluting the heating coil.

The application of the electric heating sleeve to the reaction work of inflammable and explosive dangerous articles is required to realize the functions, and the possibility of explosion in the environment where the inflammable and explosive dangerous articles are scattered or dust is guaranteed to be reduced as much as possible, so that the improvement of the existing electric heating sleeve is proposed.

Disclosure of Invention

In order to solve the problems, the utility model provides an explosion-proof heating device.

The object of the utility model is achieved in the following way: the explosion-proof heating device comprises a shell 6, wherein an accommodating cavity 61 which is open outwards is formed in the top of the shell 6, a heating coil 62 is arranged below the accommodating cavity 61, and an explosion-proof sealing structure is arranged outside the heating coil 62.

Further, the controller 63 is fixedly connected to one side of the casing 6, the controller 63 is electrically connected to the heating coil 62, the explosion-proof sealing structure comprises a sealing box 64, the heating coil 62 is arranged in the sealing box 64, one end of the sealing box 64 is fixedly connected with an explosion-proof junction box 65, the output end of the explosion-proof junction box 65 extends into the sealing box 64 and is electrically connected with the heating coil 62, the sealing box 64 is in sealing connection with the explosion-proof junction box 65, one end of an input end of the explosion-proof junction box 65 is fixedly connected with one end of an explosion-proof cable 66, and the other end of the explosion-proof cable 66 is connected with the controller 63.

Further, the accommodating cavity 61 is made of metal, the surface of the accommodating cavity 61 is void-free, and the accommodating cavity 61 and the housing 6 are integrally formed.

As an aspect, the sealing connection between the sealing box 64 and the explosion-proof junction box 65 means that a sealing ring 68 is disposed between the sealing box 64 and the explosion-proof junction box 65.

As an aspect, the sealing connection between the sealing box 64 and the explosion-proof junction box 65 means that a continuous welding seam is arranged between the sealing box 64 and the explosion-proof junction box 65 to form a sealing welding seam.

Alternatively, the seal case 64 may have a disk shape.

Alternatively, the sealing case 64 may be hemispherical to match the shape of the bottom of the accommodating chamber 61.

Further, the material of the accommodating chamber 61 and the sealing box 64 is aluminum or aluminum alloy.

Compared with the prior art, the utility model is provided with the explosion-proof sealing structure outside the heating coil, so that the explosion caused by tiny electric sparks is prevented.

Drawings

FIG. 1 is a front view of a weighing apparatus of an embodiment in which a reaction instrument is raised and lowered;

FIG. 2 is a front view of an embodiment of the lifting of a reaction instrument;

FIG. 3 is a side view of an embodiment of the lifting of the reaction instrument and a cross-sectional view of a housing portion;

FIG. 4 is a front view of a weighing device of an embodiment in which the weighing device is raised and lowered;

FIG. 5 is a side view of an embodiment of a lifting of a weighing device and a cross-sectional view of a housing portion;

FIG. 6 is a front cross-sectional view of a housing portion with the drive mechanism being a hand wheel;

FIG. 7 is a front cross-sectional view of a housing portion when the drive mechanism is an electric motor;

FIG. 8 is a schematic view of a structure in which a follower bearing mechanism is disposed at the bottom of the first support frame;

FIG. 9 is a schematic structural view of a follower bearing mechanism arranged at the bottom of a reaction instrument;

FIG. 10 is a cross-sectional view of one embodiment of an explosion-proof electrical heating enclosure;

FIG. 11 is a cross-sectional view of another embodiment of an explosion-proof electric heating sleeve;

FIG. 12 is a schematic view showing the structure of a further embodiment of the elevation of the reaction apparatus.

Wherein, 1 a reaction instrument; 11 supporting feet; 12 reaction bottles; 121 a first finish; 2, a lifting mechanism; a first support frame 21; 211 a first side panel; 212 a first support bar; 22 a second support frame; 221 a second side panel; 222 a second support bar; a 23 bottom plate; 24 shells; 241 lifting bar holes; 242 a second connection block; 25 screw rods; 251 driven bevel gear; 252 drive bevel gear; 2521 a shaft; 253 lifting block; 2531 a first connection block; a hand wheel 26; 27 a bi-directional motor; 271 a second carrier plate; 31 stirring shafts; 32 stirring motor; 33 a first carrier plate; 4 a weighing device; 5 a follow-up bearing mechanism; 51 sliding rails; 52 a carrier plate; 53 guide bars; 54 moving the block; 6, a shell; 61 a receiving chamber; 62 heating coils; a 63 controller; 64 sealing the box; 65 explosion-proof junction box; 66 explosion-proof cable; 67 mounting seats; 68 sealing rings; 7, rotating the seat.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the present utility model, unless explicitly specified and limited otherwise, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used for convenience of description and for simplifying the description only with respect to the orientation or positional relationship shown in the drawings, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model.

As shown in fig. 1 to 7, a reaction instrument weighing device comprises a reaction instrument 1, a first supporting frame 21 for supporting the reaction instrument 1, a weighing device 4 arranged at a position (preferably below) lower than the reaction instrument 1, and a lifting mechanism 2, wherein the reaction instrument 1 is contacted with the weighing device 4 through the lifting mechanism 2 for weighing.

The supporting legs 11 are respectively arranged near the four corners of the bottom of the existing reaction instrument 1, the first supporting frame 21 is designed to avoid the supporting legs 11, and the bottom of the supporting legs 11 is lower than the bottom of the first supporting frame 21, so that the first supporting frame 21 cannot interfere with the weighing device 4 to influence experimental results during weighing.

Compared with the prior art, when the weighing device is used for weighing, the lifting mechanism 2 is used for controlling the reaction instrument 1 or the weighing device 4 to lift, so that the reaction instrument 1 or the weighing device 4 is contacted, the weighing device 4 is used for weighing, and the reaction instrument 1 and the weighing device 4 are separated through the lifting mechanism 2 after data are obtained, so that the accuracy of the weighing device 4 is not reduced or even is invalid due to the fact that the reaction instrument 1 is pressed on the weighing device 4 for a long time.

Further, the lifting mechanism 2 comprises a bottom plate 23, the upper part of the bottom plate 23 is fixedly connected with a shell 24, a screw rod 25 is arranged in the shell 24, one end of the screw rod 25 is rotatably connected with the upper end inside the shell 24 through a bearing, and the other end of the screw rod 25 is rotatably connected with the upper part of the bottom plate 23 through a bearing.

The lifting block 253 is sleeved on the screw rod 25, the lifting block 253 is in threaded connection with the screw rod 25, one side of the lifting block 253 is fixedly connected with one end of the first connecting block 2531, the other end of the first connecting block 2531 penetrates through the shell 24 to be fixedly connected with the first support frame 21 or the second support frame 22, lifting strip holes 241 matched with the first connecting block 2531 are formed in the shell 24, preferably, the number of the connecting blocks 2531 and the number of the lifting strip holes 241 are two, and the width of the lifting strip holes 241 is equal to or slightly larger than that of the connecting blocks 2531, so that the lifting strip holes 241 can play a left-right limiting function on the connecting blocks 2531, and the lifting block 253 is prevented from rotating along with the screw rod 25.

The screw 25 is fixedly connected with the driven bevel gear 251, the driven bevel gear 251 is meshed with the drive bevel gear 252, the drive bevel gear 252 is fixedly connected with one end of the rotating shaft 2521, and the other end of the rotating shaft 2521 penetrates through the shell 24 to be connected with the driving mechanism.

One of the schemes is as follows: referring to fig. 1-3, the first support frame 21 is connected with the lifting mechanism 2, the first support frame 21 includes a first side plate 211, the back of the first side plate 211 is fixedly connected with a first connecting block 2531, two sides of the lower part of the front of the first side plate 211 are respectively fixedly connected with a first support rod 212, the first support rod 212 is used for supporting the reaction instrument 1, the bottom of the reaction instrument 1 is fixedly connected with a support leg 11, and the bottom of the support leg 11 is lower than the bottom of the first support rod 212; the weighing device 4 is arranged on a bottom plate 23, i.e. the bottom plate 23 serves as a support plate for the weighing device 4.

Another scheme is as follows: referring to fig. 4-5, the first support frame 21 includes a first side plate 211, the back of the side plate 211 is fixedly connected with one end of a second connecting block 242, the other end of the second connecting block 242 is fixedly connected with a housing 24, two sides of the front lower part of the first side plate 211 are respectively fixedly connected with a first support rod 212, the first support rod 212 is used for supporting the reaction instrument 1, the bottom of the reaction instrument 1 is fixedly connected with a supporting leg 11, and the bottom of the supporting leg 11 is lower than the bottom of the first support rod 212; the second support frame 22 is arranged below the first support frame 21, the second support frame 22 is connected with the lifting mechanism 2, the second support frame 22 comprises a second side plate 221, the back of the second side plate 221 is fixedly connected with a first connecting block 2531, two sides of the front lower portion of the second side plate 221 are respectively and fixedly connected with a second support rod 222, and the second support rods 222 are used for supporting the weighing device 4.

Further, the upper part of the shell 24 is fixedly connected with a first bearing plate 33, the first bearing plate 33 is fixedly connected with the stirring motor 32, and the output shaft of the stirring motor 32 is arranged downwards; the reaction apparatus 1 is internally provided with a reaction bottle 12, a first bottle opening 121 is formed in the upper portion of the reaction bottle 12, a bottle plug is arranged on the upper portion of the first bottle opening 121, a through hole is formed in the bottle plug, a stirring shaft 31 is connected in the through hole in a sliding mode, the lower end of the stirring shaft 31 stretches into the reaction bottle 12 and is fixedly connected with a stirring blade, the upper end of the stirring shaft 31 stretches out of the reaction bottle 12 and is fixedly connected with an output shaft of a stirring motor 32 through a coupling, preferably, the bottle plug is made of rubber, and the inner diameter of the through hole is equal to or slightly larger than the outer diameter of the stirring shaft 31, so that the reaction bottle 12 is sealed as much as possible.

The reaction bottle 12 should also have two bottle openings, wherein one bottle opening can be connected with the condensing tube through a hose and then connected with the collecting bottle, or directly connected with the collecting bottle through a hose, for collecting the product reacted by the reaction bottle 12; the other bottle mouth is provided with a bottle stopper, and a temperature measuring rod penetrates through the bottle stopper and stretches into the bottle to monitor the temperature in the reaction bottle 12.

As shown in fig. 6, the driving mechanism may be a hand wheel 26, one side of the hand wheel 26 is fixedly connected with the rotating shaft 2521, and the other side is provided with a handle, so that the lifting mechanism 2 is manually controlled by a person.

As shown in fig. 7, the driving mechanism may be a bi-directional motor 27, an output shaft of the bi-directional motor 27 is fixedly connected with the rotating shaft 2521, a motor base of the bi-directional motor 27 is fixedly connected with the second bearing plate 271, and the second bearing plate 271 is fixedly connected with the housing 24.

Further, the weighing device 4 does not use a pressure sensor with relatively low precision any more, but is changed into an electronic scale/balance, preferably a high-precision balance or a special balance, wherein the high-precision balance refers to a balance with the precision of 0.01% -0.001%, the special balance refers to a balance with the precision of higher than 0.001%, and the other advantage of selecting the high-precision balance or the special balance is that: the vibration resistance of the high-precision balance and the special balance in the prior art is excellent, and the vibration caused by stirring the substances in the reaction bottle 12 through the stirring shaft in the reaction process can be solved, so that the resulting error can be solved for the high-precision balance or the special balance.

The shell 24 can be provided with a controller, and is also provided with an electromagnetic four-way valve or a five-way valve, the input end of the multi-way valve is connected with a power supply, and the output end of the multi-way valve is respectively and electrically connected with the controller, the weighing device 4 and the reaction instrument; the controller is electrically connected to the temperature measuring bar and the stirring motor 32, respectively, for detecting temperature and controlling stirring speed.

The working process of the utility model is as follows: the driving bevel gear 252 is driven to rotate by controlling the rotation of the rotating shaft 2521 through the driving mechanism, the engaged driven bevel gear 251 is driven to rotate, the screw 25 is driven to rotate, the first connecting block 2531 and the lifting block 253 limited by the lifting strip hole 241 are driven to lift, the first supporting frame 21 or the second supporting frame 22 is driven to lift, the first supporting frame 21 and the second supporting frame 22 are driven to approach each other, and after the supporting feet 11 of the reaction instrument 1 are abutted against the weighing device 4, the reaction instrument 1 is lifted further, so that the bottom of the reaction instrument 1 is completely separated from the support of the first supporting rod 212, namely, the whole weight of the reaction instrument 1 is pressed on the weighing device 4 for weighing; after the weighing is finished, the driving mechanism controls the rotating shaft 2521 to reversely rotate, so that the reaction instrument 1 is separated from the weighing device 4, and one-time weighing is finished; the reaction instrument is weighed for multiple times in the whole reaction process, and the reaction progress is monitored.

Further, and in particular with respect to the schemes of fig. 1-3: referring to fig. 8, a follower bearing mechanism 5 is disposed at the bottom of the first support frame 21, the follower bearing mechanism 5 includes a first support rod 212, two slide rails 51 are respectively fixed on front and rear sides of the bottom, the two slide rails 51 are disposed in parallel, a bearing plate 52 is clamped between the two slide rails 51 and is slidingly connected with the two slide rails, a guide rod 53 is connected to the top of the bearing plate 52, an external thread is disposed at the bottom of the guide rod 53, a mounting groove is disposed at the top of the bearing plate 52, and an internal thread matched with the external thread is disposed in the mounting groove; the guide rod 53 is connected with the moving block 54 in a sliding way, and a jacking screw rod is arranged on the side of the moving block 54 and used for jacking the moving block 54 on the guide rod 53; the movable block 54 is provided with fixing means for fixing the reaction transmitting means and the reaction receiving means.

In detail, as shown in fig. 8, two guide rods 53 are provided, a first guide rod 53 is close to the reaction instrument 1, a clamping jaw is hinged on a moving block 54 on the first guide rod 53, a condenser tube is clamped in the clamping jaw during operation and used for cooling a reacted substance, a material outlet of the reaction instrument 1 is connected to a material inlet end of the condenser tube through a pipeline, a clamping jaw is hinged to the upper portion of the moving block 54 on the second guide rod 53, a bottle holder is fixedly connected to the lower portion of the moving block, a collecting bottle is fixed in a bottom supporting and top limiting mode, and the material outlet end of the condenser tube is connected with the material inlet of the collecting bottle through a pipeline.

Although the lifting action of the reaction apparatus 1 can be made not to affect the discharge by providing a flexible pipe, the reaction apparatus needs to be hard-connected through a glass tube for the reactive material which is inflammable and explosive or has strong corrosiveness, which results in that the transmission device and the receiving device of the reaction apparatus need to be lifted along with the reaction apparatus 1.

Of course, one problem with setting the follower bearing mechanism 5 at the bottom of the first support frame 21 is that: the control requirement for the lifting device is high, and if the first support rod 212 is excessively separated from the bottom of the reaction apparatus 1 during weighing, the glass tube connected above will be broken, so another preferable scheme is proposed: as shown in fig. 9, two sliding rails 51 of the follow-up bearing mechanism 5 are fixedly connected to the bottom of the reaction apparatus 1 through a plurality of connecting rods. The distance between the sliding rail 51 and the bottom of the reaction apparatus 1 is greater than the thickness of the first support bar 212.

When the device is used, the bearing plate 52 is pulled out from the bottom of the reaction instrument 1, the guide rod 53 is fixedly connected to a proper position on the bearing plate 52 through bottom threads, instruments such as a condenser tube, a collecting bottle and the like are fixed on the moving block 54 through clamping jaws and bottle holders, the moving block 54 is adjusted to a proper height through a tight pushing screw, and the reaction bottle 12, the condenser tube and the collecting bottle are sequentially connected through a straight glass tube or a bent glass tube; after the use, the parts are removed in sequence, and the bearing plate 52 is sent to the bottom of the reaction instrument 1, so that the transportation is convenient and the space occupation is reduced.

As shown in fig. 12, as a parallel scheme of the weighing device of the reaction apparatus, the lifting mechanism 2 is used for controlling the reaction apparatus 1 to lift, the bottom of the lifting mechanism 2 is rotatably connected with the rotating base 7, and the weighing device 4 and the heating device are respectively arranged at the two sides of the lifting mechanism 2 and at the position lower than the reaction apparatus 1, so that the reaction apparatus 1 is located above the corresponding device through the rotating base 7 and then lifted.

In detail, in the scheme shown in fig. 1-9, the reaction apparatus 1 is combined by an electric heating sleeve and a reaction bottle, the electric heating sleeve and the reaction bottle cannot be separated at will, so that the reaction apparatus 1 is regarded as a whole to lift together, but in consideration of other working conditions, for example, in fig. 12, the reaction apparatus 1 is replaced by a reaction kettle, the reaction kettle is not suitable for lifting together with a heating mechanism (the total weight is high), so that the lifting mechanism is matched with the reaction kettle, a plurality of hangers are respectively arranged on two sides of the reaction kettle, a plurality of first support rods 212 are matched with the hangers for supporting, a motor is fixedly connected in a rotating seat 7, the motor is connected with a speed reducer, the output end of the speed reducer is rotationally connected with the bottom of a shell 24, the shell 24 is driven to rotate in the horizontal direction, weighing devices 4 and heating devices are respectively arranged on two sides of the shell 24, the reaction kettle is rotated to the upper part of the corresponding device according to requirements, and then lifted for matching, and in this case, a condenser tube and a collecting bottle can be matched and fixed between the shell 24.

Further, the reaction apparatus 1 is an electric jacket, and an explosion-proof heating device is proposed herein, as shown in fig. 10-11, and comprises a housing 6, wherein an accommodating cavity 61 with an outward (upward) opening is arranged at the top of the housing 6, a heating coil 62 is arranged below the accommodating cavity 61, one side of the housing 6 is fixedly connected with a controller 63, the heating coil 62 is electrically connected with the controller 63, the accommodating cavity 61 is made of metal, the accommodating cavity 61 and the housing 6 are in an integral structure, and the surface of the accommodating cavity 61 has no pore; an explosion-proof sealing structure is arranged outside the heating coil 62.

The accommodating chamber 61 is not limited to the hemispherical shape shown in the drawings, and may be a cylinder, square, or other polygonal shape depending on the shape of the heating container.

The accommodating chamber 61 and the housing 6 may be integrally formed or welded.

Compared with the prior art, the metal containing cavity 61 and the shell 6 are of an integrated structure, the electric heating sleeve is directly changed into a leakage-proof structure without adding protection on the original basis, the anti-explosion heating coil is suitable for industrial production environments, and the anti-explosion sealing structure is arranged outside the heating coil 62, so that explosion caused by tiny electric sparks is prevented, and the anti-explosion heating coil is particularly explosion-proof in an anhydrous environment.

Further, the explosion-proof sealing structure comprises a sealing box 64, the heating coil 62 is arranged in the sealing box 64, one end of the sealing box 64 is fixedly connected with an explosion-proof junction box 65, the output end of the explosion-proof junction box 65 extends into the sealing box 64 and is electrically connected with the heating coil 62, the sealing box 64 is in sealing connection with the explosion-proof junction box 65, the input end of the explosion-proof junction box 65 is fixedly connected with one end of an explosion-proof cable 66, and the other end of the explosion-proof cable 66 is connected with the controller 63.

The connected cable is replaced by an explosion-proof cable 66, the heating coil 62 is sealed, the possibility of explosion caused by any tiny electric spark generated by electric connection is avoided, the disadvantage is that the sealing box 64 reduces the heat conduction efficiency, but the advantage is that the safety is greatly improved.

Further, the sealing connection between the sealing box 64 and the explosion-proof junction box 65 means that a sealing ring 68 is arranged between the sealing box 64 and the explosion-proof junction box 65.

As an alternative to the above, the sealing connection between the sealing box 64 and the explosion-proof junction box 65 means that a continuous welding seam is provided between the sealing box 64 and the explosion-proof junction box 65, so as to form a sealing weld.

Further, as shown in fig. 10, the seal case 64 has a disk shape.

As an alternative to the above, as shown in fig. 11, the sealing case 64 has a hemispherical shape matching with the bottom shape of the accommodating cavity 61, so as to improve the heating efficiency by a cladding structure.

Further, the material of the accommodating chamber 61 and the sealing box 64 is aluminum or aluminum alloy.

The structure is used for inflammable and explosive dangerous articles at the beginning of design, and is used in chemical reactions with higher precision requirements, specific products are secret, the description is inconvenient, and the requirements at the beginning of design include but are not limited to:

the first requirement is: the gap between the stirring paddle and the bottom of the kettle body is 0.5cm

And the second requirement is that: any posture and track movement in the space range of the kettle body can be realized, including but not limited to lifting, left and right front and back movement, tilting and the like

And the third requirement is: stirring system and kettle cover move up and down along with kettle body

And the fourth requirement is: the kettle body can realize single operation transfer

And the fifth requirement: can realize accurate measurement in the reaction process (ensure that the measurement part has no redundant interference force)

And (6) requirement six: ensuring the tightness of the system during reaction in a high vacuum state

And the seventh requirement: reducing vibration of equipment as much as possible in the reaction process

Requirement eight: the load-bearing part of the equipment can bear 180KG. The weighing part is not more than 55kg

Requirement nine: the air vent is designed to be capable of feeding

The requirement is ten: the kettle cover opening is as follows: air discharge port (shared with charging port), temperature measuring port, stirring port, solid charging port and condensing port

Eleven requirements: the kettle cover and the condenser part can not generate steam reflux, and simultaneously ensure the visibility

Twelve requirements: because the viscosity of the material is higher, the power of the stirring motor is increased

Thirteen requirements: the heating device does not see oil and water, so that the explosion resistance of the whole device is ensured

Fourteen requirements: dead-angle-free sinking material at bottom of kettle body

Fifteen requirements: the system reacts under high vacuum state

Sixteen requirements are: ensure the safety of the whole machine and the safety and explosion prevention of the whole machine

Seventeen requirements: ensure the posture and balance of the kettle body during weighing

Eighteen requirements: reducing complexity of operation

Nineteen requirements: the personnel safety of operators is ensured, and the explosion-proof electric heating sleeve provided by the utility model can be taken into consideration.

The scheme of the utility model can mainly meet or partially meet one, two, four, five, six, seven, ten, thirteen, sixteen, seventeen and nineteen of the requirements.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several changes and modifications can be made without departing from the general inventive concept, and these should also be regarded as the scope of the utility model.

Claims (8)

1. The utility model provides an explosion-proof heating device, includes casing (6), casing (6) top sets up outwards open-ended holds chamber (61), holds chamber (61) below and sets up heating coil (62), its characterized in that: an explosion-proof sealing structure is arranged outside the heating coil (62); the explosion-proof sealing structure comprises a sealing box (64), a heating coil (62) is arranged in the sealing box (64), and one end of the sealing box (64) is fixedly connected with an explosion-proof junction box (65).

2. An explosion-proof heating apparatus as defined in claim 1, wherein: the explosion-proof electric heating device is characterized in that one side of the shell (6) is fixedly connected with the controller (63), the heating coil (62) is electrically connected with the controller (63), the output end of the explosion-proof junction box (65) stretches into the sealing box (64) and is electrically connected with the heating coil (62), the sealing box (64) is in sealing connection with the explosion-proof junction box (65), the input end of the explosion-proof junction box (65) is fixedly connected with one end of the explosion-proof cable (66), and the other end of the explosion-proof cable (66) is connected with the controller (63).

3. An explosion-proof heating apparatus as defined in claim 2, wherein: the accommodating cavity (61) is made of metal, the surface of the accommodating cavity (61) is void-free, and the accommodating cavity (61) and the shell (6) are of an integrated structure.

4. An explosion-proof heating apparatus as defined in claim 2, wherein: the sealing connection between the sealing box (64) and the explosion-proof junction box (65) means that a sealing ring (68) is arranged between the sealing box (64) and the explosion-proof junction box (65).

5. An explosion-proof heating apparatus as defined in claim 2, wherein: the sealing connection between the sealing box (64) and the explosion-proof junction box (65) means that a continuous welding seam is arranged between the sealing box (64) and the explosion-proof junction box (65) to form sealing welding.

6. An explosion-proof heating apparatus as defined in claim 2, wherein: the seal box (64) is disc-shaped.

7. An explosion-proof heating apparatus as defined in claim 2, wherein: the sealing box (64) is hemispherical and matched with the bottom shape of the accommodating cavity (61).

8. An explosion-proof heating apparatus as defined in claim 3, wherein: the accommodating cavity (61) and the sealing box (64) are made of aluminum or aluminum alloy.