CN215002848U

CN215002848U - Environment-friendly muffle furnace

Info

Publication number: CN215002848U
Application number: CN202120890693.1U
Authority: CN
Inventors: 蒋霞; 杨仁明; 高蓓
Original assignee: Chengdu Xuzhe Pharmaceutical Technology Co Ltd
Current assignee: Sichuan Aobang Gude Pharmaceutical Co ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2021-12-03
Anticipated expiration: 2031-04-28

Abstract

The utility model provides an environment-friendly muffle furnace relates to firing equipment technical field. The environment-friendly muffle furnace comprises an outer furnace body, an inner furnace body, a hearth and a gas purification mechanism. The entry has been seted up to one side of outer furnace body, and the entrance is pegged graft and is had the furnace gate that matches with the entry, and the furnace gate passes through locking mechanism to be fixed at the entrance. A supporting rod is fixed in the middle of the furnace door, a supporting plate is fixed on the supporting rod, and a crucible frame is arranged on the supporting plate. An inserted bar with an I-shaped cross section is fixed at the lower part of the furnace door, a guide rail is arranged at the bottom of the furnace chamber, and the guide rail is provided with a jack matched with the inserted bar. A heating mechanism for heating the crucible is arranged in the hearth. The gas purification mechanism comprises a water tank, a gas guide pipe and a purification pipe. The water tank is fixed at the top of outer furnace body, and the purge tube is connected at the top of water tank, and the purge tube internal fixation has a plurality of active carbon adsorption boards. The arrangement of the gas purification mechanism can remove most harmful gases in the hearth so as to avoid adverse effects on the health of people.

Description

Environment-friendly muffle furnace

Technical Field

The utility model belongs to the technical field of the firing equipment technique and specifically relates to an environment-friendly muffle furnace is related to.

Background

The muffle furnace is a universal heating device, and the universal nomenclature in China includes the following: electric furnace, resistance furnace, Mafu furnace. After the existing muffle furnace is used, harmful gases exist in the muffle furnace, and if the harmful gases are directly discharged, the muffle furnace can pollute the environment and even have adverse effects on the health of people.

Disclosure of Invention

In order to the above situation, the utility model provides an environment-friendly muffle furnace has solved current muffle furnace and has used the back, has some harmful gas in it, if directly discharge, can cause the pollution to the environment, causes adverse effect's technical problem even to people's the healthy.

In order to achieve the above object, the utility model provides a following technical scheme:

an environment-friendly muffle furnace mainly comprises: outer furnace body, interior furnace body, furnace and gaseous purification mechanism.

The inner side of the outer furnace body is provided with a heat insulation layer. The entry has been seted up to one side of outer furnace body, and the entrance is pegged graft and is had the furnace gate that matches with the entry, and the furnace gate passes through locking mechanism to be fixed at the entrance. A supporting rod is fixed in the middle of the furnace door, a supporting plate is fixed on the supporting rod, and a crucible frame is arranged on the supporting plate. An inserted bar with an I-shaped cross section is fixed at the lower part of the furnace door, a guide rail is arranged at the bottom of the furnace chamber, and the guide rail is provided with a jack matched with the inserted bar. A heating mechanism for heating the crucible is arranged in the hearth.

The gas purification mechanism comprises a water tank, a gas guide pipe and a purification pipe. The water tank is fixed at the top of outer furnace body, and the air duct has the valve and communicates with furnace, and the upper end of air duct has a plurality of gas pockets along its radial setting. The purifying tube is connected at the top of water tank, and the purifying tube internal fixation has a plurality of active carbon adsorption boards.

The gas purification mechanism can remove most harmful gas in the hearth, and before the furnace door is opened, the gas cylinder in the hearth can be discharged into the purification mechanism for treatment so as to avoid adverse effects on the health of people. Through fixing the crucible frame on the furnace gate, combine the use of inserted bar and guide rail again for the operator only needs to take the furnace gate out a section distance when getting into the crucible, can arrange the crucible in on the crucible frame, and the operator need not stretch into furnace with the hand in, this has greatly reduced the risk that the operator was scalded. In addition, the arrangement of the inserted link and the guide rail ensures that the position of the crucible support in the hearth can be kept consistent every time an operator closes the furnace door.

The utility model discloses an in some embodiments, keep somewhere between above-mentioned outer furnace body and the interior furnace body and have cooling channel, cooling channel is connected with cooling body, and cooling body is used for accelerating furnace's cooling to reduce latency.

The utility model discloses an in some embodiments, above-mentioned cooling body includes radiator fan and consecutive outlet pipe, water pump, cooling tube, wet return.

The cooling fan is fixed in the outside of outer furnace body, and the outlet pipe is located cooling fan's below, and the wet return is located cooling fan's top, has the solenoid valve on the outlet pipe, and outlet pipe and wet return all communicate with cooling channel.

The radiating pipe is positioned on the right side of the radiating fan and is spiral and provided with radiating fins.

When the hearth is required to be cooled, the electromagnetic valve is opened, water in the cooling channel flows in a circulating mode, water in the cooling channel flows into the radiating pipe with the radiating fins, and cooling is accelerated through the radiating fan.

In some embodiments of the present invention, a protective box is fixed on the outer furnace body, and the heat dissipation tube and the heat dissipation fan are located in the protective box. The protective box is communicated with a gas-collecting hood which is communicated with an exhaust pipe.

The arrangement of the protective box, the gas collecting hood and the exhaust pipe can exhaust hot gas emitted by the radiating pipe so as to reduce the temperature of a workshop.

In some embodiments of the present invention, the above-mentioned protection box is provided with a lighting lamp. A first thermocouple is arranged in the hearth, and a first temperature controller is arranged on the protective box. The output end of the first thermocouple is electrically connected with the input end of the first temperature controller, and the output end of the first temperature controller is electrically connected with the control end of the electromagnetic valve.

The setting of light makes things convenient for the operator to operate when light condition is relatively poor. When the furnace chamber needs to be cooled, the first temperature controller is powered on firstly, so that the first temperature controller works normally, when the temperature detected by the first thermocouple is higher than a preset value, the first temperature controller opens the electromagnetic valve, and when the temperature detected by the first thermocouple is lower than the preset value, the first temperature controller closes the electromagnetic valve.

In some embodiments of the present invention, the locking mechanism includes a cushion block, a rotating plate, a rotating shaft, a first nut, a rotating handle, a supporting frame, a screw rod, a pressing plate, and a rotating handle.

The pivot passes through the bearing and installs on outer furnace body, and the one end of rotor plate is fixed in the pivot, and the pivot is located and between rotor plate and the outer furnace body to the cushion cover, and first nut spiro union is on the pivot, and the rotor plate is located between first nut and the cushion.

The support frame is fixed in the rotating plate and keeps away from the one end of pivot, and the screw rod and support frame spiro union run through the rotating plate. The pressing plate is used for limiting the movement of the furnace door, the pressing plate is connected to the screw rod through a bearing, and the rotating handle is fixed at one end, far away from the furnace door, of the screw rod.

After the furnace door is closed, an operator can unscrew the first nut through the rotating handle, the rotating plate rotates downwards under the action of self gravity, then the rotating handle is screwed, the pressing plate is pressed on the furnace door, and then the first nut is screwed. When the furnace door needs to be opened, the rotating handle is reversely screwed to enable the pressing plate to be separated from the furnace door, the first nut is unscrewed, the rotating plate is rotated upwards, and then the first nut is screwed, so that the furnace door can be opened.

The utility model discloses an in some embodiments, install telescopic cylinder on the above-mentioned outer furnace body, change and be fixed with the connecting rod on, telescopic cylinder's tailpiece of the piston rod rotates with the connecting rod and links to each other. The environment-friendly muffle furnace is provided with a second thermocouple and a second temperature controller. The second thermocouple is arranged in the hearth, the output end of the second thermocouple is electrically connected with the input end of the second temperature controller, and the output end of the second temperature controller is electrically connected with the control end of the telescopic cylinder.

Through the arrangement of the telescopic cylinder, the connecting rod, the second thermocouple and the second temperature controller, when the temperature detected by the second thermocouple is lower than a preset value (550 ℃), the second temperature controller enables the telescopic cylinder to act to unscrew the first nut, so that an operator can rotate the rotating plate to open the furnace door; when the temperature that the second thermocouple detected is higher than preset value (550 ℃), the second temperature controller made telescopic cylinder move to screw up first nut, in order to avoid opening the furnace gate because of the maloperation (the temperature in the stove is higher this moment, if open the furnace gate in a trade, there is the safety risk).

In some embodiments of the present invention, the connecting rod is screwed with a second nut.

The setting of second nut, both be convenient for connecting rod and telescopic cylinder's being connected, can also take off telescopic cylinder when telescopic cylinder damages to guarantee can normally open and close the furnace gate.

The embodiment of the utility model provides an at least, have following advantage or beneficial effect:

1. the gas purification mechanism can remove most harmful gas in the hearth, and before the furnace door is opened, the gas cylinder in the hearth can be discharged into the purification mechanism for treatment so as to avoid adverse effects on the health of people. Through fixing the crucible frame on the furnace gate, combine the use of inserted bar and guide rail again for the operator only needs to take the furnace gate out a section distance when getting into the crucible, can arrange the crucible in on the crucible frame, and the operator need not stretch into furnace with the hand in, this has greatly reduced the risk that the operator was scalded. In addition, the arrangement of the inserted link and the guide rail ensures that the position of the crucible support in the hearth can be kept consistent every time an operator closes the furnace door.

2. When the hearth is required to be cooled, the electromagnetic valve is opened, water in the cooling channel flows in a circulating mode, water in the cooling channel flows into the radiating pipe with the radiating fins, and cooling is accelerated through the radiating fan.

3. When the temperature detected by the second thermocouple is lower than a preset value, the second temperature controller enables the telescopic cylinder to act to unscrew the first nut, so that an operator can rotate the rotating plate to open the furnace door; when the temperature detected by the second thermocouple is higher than the preset value, the second temperature controller enables the telescopic cylinder to act so as to tighten the first nut, and the oven door is prevented from being opened due to misoperation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of an environment-friendly muffle furnace according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is a schematic structural view of a guide rail and an insertion rod provided in an embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of the IV site of FIG. 1;

fig. 5 is a schematic structural view of the right side of the locking mechanism in fig. 1.

Icon: 11-outer furnace body, 111-inlet, 112-furnace door, 113-supporting rod, 114-supporting plate, 115-crucible holder, 116-inserted rod, 117-cooling channel, 13-inner furnace body, 14-hearth, 141-guide rail, 15-locking mechanism, 151-cushion block, 152-rotating plate, 153-rotating shaft, 154-first nut, 155-rotating handle, 156-supporting frame, 157-screw rod, 158-pressing plate, 159-rotating handle, 161-telescopic cylinder, 162-connecting rod, 163-second nut, 164-second thermocouple, 165-second temperature controller, 171-radiating fan, 172-water outlet pipe, 174-water pump, 175-radiating pipe, 176-water return pipe, 177-radiating fin, 178-electromagnetic valve, 179-protective box, 181-gas collecting hood, 182-exhaust pipe, 183-lighting lamp, 184-first thermocouple, 185-first temperature controller, 191-water tank, 192-gas guide pipe, 193-purifying pipe, 194-air hole, 195-active carbon adsorption plate.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the embodiments of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like refer to orientations and positional relationships based on the drawings, and are used only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Example 1

Referring to fig. 1 to 5, the present embodiment provides an environment-friendly muffle furnace, which mainly includes: an outer furnace body 11, an inner furnace body 13, a hearth 14 and a gas purification mechanism.

The inner side of the outer furnace body 11 is provided with a heat insulation layer. An inlet 111 is formed in one side of the outer furnace body 11, a furnace door 112 matched with the inlet 111 is inserted into the inlet 111, and the furnace door 112 is fixed at the inlet 111 through a locking mechanism 15. A support rod 113 is fixed in the middle of the furnace door 112, a support plate 114 is fixed on the support rod 113, and a crucible holder 115 is arranged on the support plate 114. An inserting rod 116 with an I-shaped cross section is fixed at the lower part of the oven door 112, a guide rail 141 is arranged at the bottom of the hearth 14, and the guide rail 141 is provided with a jack matched with the inserting rod 116. A heating mechanism for heating the crucible is arranged in the hearth 14.

The gas purification mechanism includes a water tank 191, a gas duct 192, and a purification pipe 193. The water tank 191 is fixed on the top of the outer furnace body 11, the air duct 192 is provided with a valve and is communicated with the hearth 14, and the upper end of the air duct 192 is provided with a plurality of air holes 194 arranged along the radial direction of the air duct. The purification pipe 193 is connected to the top of the water tank 191, and a plurality of activated carbon adsorption plates 195 are fixed in the purification pipe 193.

The gas purification mechanism can remove most harmful gas in the hearth 14, and before the door 112 is opened, the gas cylinder in the hearth 14 can be discharged into the purification mechanism for treatment so as to avoid adverse effects on the health of people. By fixing the crucible frame 115 on the furnace door 112 and combining the use of the insertion rod 116 and the guide rail 141, when an operator takes in and puts in a crucible, the operator only needs to draw out the furnace door 112 for a certain distance to place the crucible on the crucible frame 115, and the operator does not need to stretch hands into the hearth 14, so that the risk of scalding the operator is greatly reduced. In addition, the arrangement of the insertion rod 116 and the guide rail 141 enables the position of the crucible holder 115 within the firebox 14 to be maintained consistently each time the operator closes the door 112.

In some embodiments of the present invention, a cooling channel 117 is left between the outer furnace body 11 and the inner furnace body 13, the cooling channel 117 is connected to a cooling mechanism, and the cooling mechanism is used to accelerate the cooling of the furnace 14, so as to reduce the waiting time.

In some embodiments of the present invention, the cooling mechanism includes a heat dissipation fan 171, and a water outlet pipe 172, a water pump 174, a heat dissipation pipe 175, and a water return pipe 176 connected in sequence.

The heat dissipation fan 171 is fixed on the outer side of the outer furnace body 11, the water outlet pipe 172 is located below the heat dissipation fan 171, the water return pipe 176 is located above the heat dissipation fan 171, the electromagnetic valve 178 is arranged on the water outlet pipe 172, and the water outlet pipe 172 and the water return pipe 176 are both communicated with the cooling channel 117.

The heat pipe 175 is located at the right side of the heat dissipating fan 171, and the heat pipe 175 is spiral and has heat dissipating fins 177.

When the temperature of the furnace 14 needs to be lowered, the electromagnetic valve 178 is opened to circulate the water in the cooling passage 117, and the water in the cooling passage 117 flows into the heat dissipating pipe 175 having the heat dissipating fins 177, so that the temperature is lowered by the heat dissipating fan 171.

In some embodiments of the present invention, a protective box 179 is fixed on the outer furnace body 11, and the heat dissipation pipe 175 and the heat dissipation fan 171 are located in the protective box 179. The guard box 179 is connected with a gas-collecting hood 181, and the gas-collecting hood 181 is connected with an exhaust pipe 182.

The protection box 179, the gas collecting hood 181 and the exhaust pipe 182 are disposed to exhaust the hot air emitted from the heat dissipating pipe 175, thereby reducing the temperature of the workshop.

In some embodiments of the present invention, the illumination lamp 183 is installed on the protection box 179. A first thermocouple 184 is arranged in the hearth 14, and a first temperature controller 185 is arranged on the protective box 179. The output end of the first thermocouple 184 is electrically connected to the input end of the first temperature controller 185, and the output end of the first temperature controller 185 is electrically connected to the control end of the solenoid valve 178.

The setting of light 183 makes things convenient for the operator to operate when light condition is relatively poor. When the temperature of the furnace 14 needs to be reduced, the first temperature controller 185 is powered on first to enable the first temperature controller 185 to work normally, when the temperature detected by the first thermocouple 184 is higher than a preset value, the first temperature controller 185 opens the solenoid valve 178, and when the temperature detected by the first thermocouple 184 is lower than the preset value, the first temperature controller 185 closes the solenoid valve 178.

In some embodiments of the present invention, the locking mechanism 15 includes a cushion block 151, a rotating plate 152, a rotating shaft 153, a first nut 154, a rotating handle 155, a supporting frame 156, a threaded rod 157, a pressing plate 158, and a rotating handle 159.

The rotating shaft 153 is mounted on the outer furnace body 11 through a bearing, one end of the rotating plate 152 is fixed on the rotating shaft 153, the cushion block 151 is sleeved on the rotating shaft 153 and is located between the rotating plate 152 and the outer furnace body 11, the first nut 154 is screwed on the rotating shaft 153, and the rotating plate 152 is located between the first nut 154 and the cushion block 151.

The supporting frame 156 is fixed on one end of the rotating plate 152 far away from the rotating shaft 153, and the screw 157 is screwed with the supporting frame 156 and penetrates through the rotating plate 152. The pressing plate 158 is used for limiting the movement of the oven door 112, the pressing plate 158 is connected to the screw 157 through a bearing, and the rotating handle 159 is fixed at one end of the screw 157 far away from the oven door 112.

After the door 112 is closed, the operator can unscrew the first nut 154 through the rotating handle 155, rotate the rotating plate 152 downward under the action of the gravity of the operator, then screw the rotating handle 159, press the pressing plate 158 against the door 112, and then tighten the first nut 154. When the door 112 needs to be opened, the rotating handle 159 is turned reversely to separate the pressing plate 158 from the door 112, the first nut 154 is loosened, the rotating plate 152 is turned upwards, and then the first nut 154 is tightened, so that the door 112 can be opened.

In some embodiments of the present invention, the outer body 11 is provided with a telescopic cylinder 161, the rotating handle 155 is fixed with a connecting rod 162, and a piston rod end of the telescopic cylinder 161 is rotatably connected with the connecting rod 162. The environmentally friendly muffle furnace has a second thermocouple 164 and a second temperature controller 165. The second thermocouple 164 is disposed in the furnace 14, an output end of the second thermocouple 164 is electrically connected to an input end of the second temperature controller 165, and an output end of the second temperature controller 165 is electrically connected to a control end of the telescopic cylinder 161.

Through the arrangement of the telescopic cylinder 161, the connecting rod 162, the second thermocouple 164 and the second temperature controller 165, when the temperature detected by the second thermocouple 164 is lower than the preset value (550 ℃), the second temperature controller 165 makes the telescopic cylinder 161 act to loosen the first nut 154, so that the operator can rotate the rotating plate 152 to open the oven door 112; when the temperature detected by the second thermocouple 164 is higher than the preset value (550 ℃), the second temperature controller 165 operates the telescopic cylinder 161 to tighten the first nut 154, so as to prevent the door 112 from being opened due to misoperation (at this time, the temperature in the furnace is high, and if the door 112 is opened by accident, there is a safety risk).

In some embodiments of the present invention, the connecting rod 162 is screwed with a second nut 163.

The second nut 163 is provided to facilitate the connection between the connecting rod 162 and the telescopic cylinder 161, and when the telescopic cylinder 161 is damaged, the second nut 163 is unscrewed to remove the telescopic cylinder 161, so as to ensure the normal opening and closing of the oven door 112.

The working principle of the environment-friendly muffle furnace is as follows:

after the crucible is placed on the crucible holder 115, the door 112 is closed, the rotating plate 152 is rotated downward, and the rotating handle 159 is screwed to press the pressing plate 158 against the door 112, thereby fixing the door 112.

When the muffle furnace heats the crucible, and the temperature detected by the second thermocouple 164 is higher than the preset value (550 ℃), the second temperature controller 165 enables the telescopic cylinder 161 to act to tighten the first nut 154, so as to prevent the furnace door 112 from being opened due to misoperation, and further achieve the purpose of improving the safety of the equipment.

After the muffle furnace heats the crucible, the valve on the gas guide pipe 192 is opened, the first temperature controller 185 is electrified, the temperature in the muffle furnace is higher at the moment, and the electromagnetic valve 178 is opened by the first temperature controller 185. The water in the cooling channel 117 circulates and is rapidly cooled by the heat dissipation pipe 175 and the heat dissipation fan 171 of the heat dissipation fin 177. The gas in the furnace 14 is purified by passing through the water tank 191 and the purification pipe 193 in sequence, and then discharged through the purification pipe 193. It should be noted that, by introducing the gas in the furnace 14 into the water tank 191, not only the gas can be purified, but also the heat in the furnace 14 can be exhausted, so as to further accelerate the cooling of the furnace 14. When the temperature in the furnace 14 is lower than the preset value, the first temperature controller 185 closes the solenoid valve 178.

When the temperature in the furnace chamber 14 is lower than 550 ℃, the second temperature controller 165 operates the telescopic cylinder 161 to loosen the first nut 154, so that the operator can rotate the rotating plate 152 to open the furnace door 112 and take out the crucible.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An environment-friendly muffle furnace, comprising: the device comprises an outer furnace body, an inner furnace body, a hearth and a gas purification mechanism;

a heat insulation layer is arranged on the inner side of the outer furnace body; an inlet is formed in one side of the outer furnace body, a furnace door matched with the inlet is inserted into the inlet, and the furnace door is fixed at the inlet through a locking mechanism; a support rod is fixed in the middle of the furnace door, a support plate is fixed on the support rod, and a crucible frame is arranged on the support plate; an inserted bar with an I-shaped cross section is fixed at the lower part of the furnace door, a guide rail is arranged at the bottom of the furnace chamber, and the guide rail is provided with an insertion hole matched with the inserted bar; a heating mechanism for heating the crucible is arranged in the hearth;

the gas purification mechanism comprises a water tank, a gas guide pipe and a purification pipe; the water tank is fixed at the top of the outer furnace body, the air duct is provided with a valve and is communicated with the hearth, and the upper end of the air duct is provided with a plurality of air holes arranged along the radial direction of the air duct; the purifying pipe is connected to the top of the water tank, and a plurality of activated carbon adsorption plates are fixed in the purifying pipe.

2. The environment-friendly muffle furnace according to claim 1, wherein a cooling channel is reserved between the outer furnace body and the inner furnace body, the cooling channel is connected with a cooling mechanism, and the cooling mechanism is used for accelerating the cooling of the hearth.

3. The muffle furnace of claim 2, wherein the cooling mechanism comprises a cooling fan, a water outlet pipe, a water pump, a cooling pipe and a water return pipe which are connected in sequence;

the cooling fan is fixed on the outer side of the outer furnace body, the water outlet pipe is positioned below the cooling fan, the water return pipe is positioned above the cooling fan, the water outlet pipe is provided with an electromagnetic valve, and the water outlet pipe and the water return pipe are both communicated with the cooling channel;

the radiating pipe is located cooling fan's right side, the radiating pipe is the heliciform and has radiating fin.

4. The muffle furnace of claim 3, wherein a protective box is fixed on the outer furnace body, and the heat dissipation pipe and the heat dissipation fan are positioned in the protective box; the protective box is communicated with a gas-collecting hood, and the gas-collecting hood is communicated with an exhaust pipe.

5. The muffle furnace of claim 4, wherein the protective box is provided with a lighting lamp; a first thermocouple is arranged in the hearth, and a first temperature controller is arranged on the protective box; the output end of the first thermocouple is electrically connected with the input end of the first temperature controller, and the output end of the first temperature controller is electrically connected with the control end of the electromagnetic valve.

6. The environment-friendly muffle furnace of any one of claims 1-5, wherein the locking mechanism comprises a cushion block, a rotating plate, a rotating shaft, a first nut, a rotating handle, a supporting frame, a screw, a pressing plate and a rotating handle;

the rotating shaft is installed on the outer furnace body through a bearing, one end of the rotating plate is fixed on the rotating shaft, the cushion block is sleeved on the rotating shaft and located between the rotating plate and the outer furnace body, the first nut is in threaded connection with the rotating shaft, and the rotating plate is located between the first nut and the cushion block;

the support frame is fixed at one end of the rotating plate far away from the rotating shaft, and the screw is in threaded connection with the support frame and penetrates through the rotating plate; the pressing plate is used for limiting the movement of the furnace door, the pressing plate is connected to the screw rod through a bearing, and the rotating handle is fixed at one end, far away from the furnace door, of the screw rod.

7. The environment-friendly muffle furnace of claim 6, wherein a telescopic cylinder is mounted on the outer furnace body, a connecting rod is fixed on the rotating handle, and a piston rod end of the telescopic cylinder is rotatably connected with the connecting rod; the environment-friendly muffle furnace is provided with a second thermocouple and a second temperature controller; the second thermocouple is arranged in the hearth, the output end of the second thermocouple is electrically connected with the input end of the second temperature controller, and the output end of the second temperature controller is electrically connected with the control end of the telescopic cylinder.

8. The muffle of claim 7, wherein a second nut is threaded onto the connecting rod.