High-sealing-performance trolley furnace

Abstract

The utility model relates to the technical field of vacuum trolley furnaces, in particular to a high-sealing-performance trolley furnace which comprises a vacuum furnace body, two air pumps, a furnace door, two sealing rings, two annular air bags, a motor, a driving lead screw, a transport vehicle frame and an opening and closing mechanism. The power assembly comprises a rotating part, a mounting table and electric telescopic rods, when the trolley furnace is opened, the exhaust pipe is opened to release air of the annular air bag, the two electric telescopic rods are started to eject the furnace door out of the vacuum furnace body by a certain distance, and the rotating part and the mounting table are started to drive the electric telescopic rods and the furnace door to rotate till the furnace door is located above the vacuum furnace body; and the two electric telescopic rods are started again, the furnace door is placed on the placing frame and the auxiliary frame so that heat can be dissipated, the burden of the two electric telescopic rods can be relieved, then the motor is started, the lead screw is driven to start to rotate, the transport vehicle frame is automatically moved out of the vacuum furnace body, the furnace door cannot be touched during material taking, and the effect of improving the safety of the device is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum trolley furnaces, in particular to a high-sealing trolley furnace. Background Art

[0002] The trolley furnace is a national standard energy-saving periodic operation furnace, mainly used for quenching, annealing, decompression and heat treatment of various mechanical parts. The trolley furnace is easy to use, has high production efficiency and guaranteed quality, and has become the preferred product of merchants on the market. When certain workpieces are processed in a trolley furnace, there are certain requirements for the air pressure, and the trolley furnace needs to be a vacuum environment. Therefore, the sealing requirements for the trolley furnace are relatively high. The furnace doors of existing high-sealing trolley furnaces are mostly open and close, and gaps are easily generated between the furnace door and the furnace body, which will cause the internal air pressure of the trolley furnace to be unstable and affect the processing quality.

[0003] Prior art CN219776304U discloses a vacuum sealed trolley furnace, comprising a vacuum furnace body, two air pumps, two annular air bags, two sealing rings, a furnace door, a chassis, a motor, a driving screw, a transport frame and a thermal insulation inner shell, wherein the vacuum furnace body is provided with two annular grooves, the two air pumps are respectively fixedly connected to the two sides of the vacuum furnace body, and are both provided with an air inlet pipe, the furnace door is arranged on one side of the vacuum furnace body provided with the two annular grooves, the two sealing rings are fixedly connected to the inner side of the furnace door through two mounting rings, and each sealing ring is located in each annular groove, each annular air bag is arranged in each annular groove, and is connected to the air pump through an air outlet pipe and an exhaust pipe, and is located outside the sealing ring, an air release valve is provided on the exhaust pipe, the chassis is fixedly connected to the lower side of one side of the vacuum furnace body, the motor is fixedly connected to the vacuum furnace body, and is located in the chassis, the driving screw is fixedly connected to the output end of the motor and is located in the vacuum furnace body, the transport frame is threadedly connected to the driving screw and slidably connected to the vacuum furnace body, and the furnace door is fixedly connected to the top of the transport frame, and the thermal insulation inner shell is fixedly connected to the vacuum furnace body. When closing, the motor is started, and the driving screw starts to rotate, so that the transport frame drives the furnace door to move toward the vacuum furnace body until the two sealing rings enter the two annular grooves, and the two air pumps are started, and air is injected from the air outlet pipe into the two annular air bags through the two air inlet pipes. The two annular air bags become larger, and the two sealing rings are respectively fixed in the two annular grooves, and the furnace door is made closer to the vacuum furnace body, thereby increasing the sealing between the furnace door and the furnace body and automatically driving the trolley to move.

[0004] However, the above prior art fixes the furnace door on the trolley. When the material requires a higher temperature, the temperature inside the furnace door is high. Workers are easily scalded by the inside of the furnace door when picking up materials in the trolley, which poses certain safety risks. Utility Model Content

[0005] The utility model aims to provide a high-sealing trolley furnace, which solves the problem that in the prior art the furnace door is fixed on the trolley, when the material temperature is required to be high, the temperature inside the furnace door is high, and workers are easily scalded by the inside of the furnace door when picking up the material in the trolley, which poses certain safety risks.

[0006] To achieve the above-mentioned purpose, the utility model provides a high-sealing trolley furnace, including a vacuum furnace body, two air pumps, a furnace door, two sealing rings, two annular airbags, a motor, a driving screw, a transport frame and an opening and closing mechanism, the opening and closing mechanism including a shelf, an auxiliary frame and two power components, the power component including a rotating part, a mounting platform and an electric telescopic rod, the vacuum furnace body is provided with two annular grooves, the two air pumps are respectively fixedly connected to the two sides of the vacuum furnace body, the furnace door is arranged on one side of the vacuum furnace body provided with the two annular grooves, the two sealing rings are arranged on the inner side of the furnace door, and each of the sealing rings is located in each of the annular grooves, each of the annular airbags is arranged in each of the annular grooves, and is connected to the air pump through an air outlet pipe and an exhaust pipe. The motor is fixedly connected to the lower side of the vacuum furnace body, the driving screw is fixedly connected to the output end of the motor and is located in the vacuum furnace body, the transport frame is threadedly connected to the driving screw and is slidably connected to the vacuum furnace body, the shelf is fixedly connected to the vacuum furnace body and is located above the vacuum furnace body, the auxiliary frame is fixedly connected to the vacuum furnace body and is located above the vacuum furnace body and on one side of the shelf, the two power assemblies are located on both sides of the vacuum furnace body, the rotating member is arranged on one side of the vacuum furnace body, the mounting platform is arranged on one side of the rotating member, the electric telescopic rod is fixedly connected to the top of the mounting platform, and the output rod is fixedly connected to the furnace door.

[0007] Wherein, the rotating part includes a notched gear, a driving wheel and a rotating motor. The notched gear is rotationally connected to the vacuum furnace body and fixedly connected to the mounting platform and is located outside the vacuum furnace body. The rotating motor is fixedly connected to the vacuum furnace body. The driving wheel is fixedly connected to the output end of the rotating motor and meshes with the notched gear.

[0008] Wherein, the rotating member also includes a first support frame and a second support frame, the first support frame is fixedly connected to the vacuum furnace body and is located below the mounting platform, the second support frame is fixedly connected to the vacuum furnace body and is located on one side of the first support frame and is horizontally arranged with the first support frame.

[0009] Wherein, the rotating part also includes a protective shell and an observation window, the protective shell is fixedly connected to the vacuum furnace body and is located outside the driving wheel, the protective shell is provided with an observation slot, the observation window is fixedly connected to the protective shell and is located in the observation slot.

[0010] Among them, the high-sealing trolley furnace also includes an auxiliary component, which is arranged on both sides of the transport frame. The auxiliary component includes two bow bars, multiple screws and two thermal insulation protective layers. The two bow bars are fixedly connected to the two sides of the transport frame and are slidingly connected to the vacuum furnace body. Multiple screws are threadedly connected to the transport frame and the bow bars, and the two thermal insulation protective layers are respectively fixedly connected to the surfaces of the two bow bars.

[0011] Among them, the high-sealing trolley furnace also includes a vacuum extraction mechanism, which includes a protective box and a vacuum pump. The protective box is arranged on one side of the vacuum furnace body, and the vacuum pump is fixedly connected to the protective box and is provided with an inlet pipe and an outlet pipe. The inlet pipe is connected to the vacuum furnace body, and the inlet pipe and the outlet pipe both pass through the protective box.

[0012] Among them, the vacuum extraction mechanism also includes a vacuum measuring instrument, a front end valve and a rear end valve. The vacuum measuring instrument is fixedly connected to one side of the vacuum furnace body and passes through the vacuum furnace body. The front end valve is arranged on the inlet pipe and fixedly connected to the outside of the vacuum furnace body. The rear end valve is arranged on the outlet pipe and fixedly connected to the outside of the protective box.

[0013] The utility model discloses a high-sealing trolley furnace, when the trolley furnace is opened, the exhaust pipe is opened to release the gas in the annular airbag, the two electric telescopic rods are started, the furnace door is pushed out until the sealing ring completely leaves the vacuum furnace body for a distance, the rotating member is started to drive the mounting platform to rotate, and then the electric telescopic rod and the furnace door are driven to rotate until the furnace door is completely located above the vacuum furnace body, the two electric telescopic rods are started again, the furnace door is lowered and placed on the shelf and the auxiliary frame, so that the inner side of the furnace door can dissipate heat and cool down, and the workload of the two electric telescopic rods is reduced, then the motor is started, the driving screw starts to rotate, and the transport frame is automatically moved out of the vacuum furnace body, the furnace door will not be touched when taking materials, and the prior art avoids fixing the furnace door on the trolley. When the material requires a high temperature, the temperature inside the furnace door is high, and workers are easily scalded by the inner side of the furnace door when picking up the material in the trolley, which has a certain safety risk, thereby achieving the effect of increasing the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0015] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the utility model.

[0016] Figure 2 It is a schematic diagram of the structure inside the protective shell of the first embodiment of the utility model.

[0017] Figure 3 It is a cross-sectional view of the motor of the first embodiment of the utility model.

[0018] Figure 4 It is a partial cross-sectional view of the annular airbag of the first embodiment of the utility model.

[0019] Figure 5 It is an enlarged view of the arched strip of the first embodiment of the utility model.

[0020] Figure 6 It is a schematic diagram of the overall structure of the second embodiment of the utility model.

[0021] 101-vacuum furnace body, 102-air pump, 103-furnace door, 104-sealing ring, 105-annular airbag, 106-motor, 107-driving screw, 108-transport frame, 109-shelf rack, 110-auxiliary rack, 111-thermal insulation protection layer, 112-mounting table, 113-electric telescopic rod, 114-notched gear, 115-driving wheel, 116-rotating motor, 117-first supporting frame, 118-second supporting frame, 119-protective shell, 120-observation window, 121-bow bar, 122-screw, 223-protective box, 224-vacuum pump, 225-vacuum measuring instrument, 226-front valve, 227-rear valve. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0023] The first embodiment of the present application is:

[0024] See also Figure 1-Figure 5 ,in Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the utility model; Figure 2 This is a schematic diagram of the structure inside the protective shell of the first embodiment of the utility model;

[0025] Figure 3is a cross-sectional view of the motor of the first embodiment of the utility model; Figure 4 It is a partial cross-sectional view of the annular airbag of the first embodiment of the utility model; Figure 5 It is an enlarged view of the arched strip of the first embodiment of the utility model.

[0026] The utility model provides a high-sealing trolley furnace: comprising a vacuum furnace body 101, two air pumps 102, a furnace door 103, two sealing rings 104, two annular airbags 105, a motor 106, a driving screw 107, a transport frame 108 and an opening and closing mechanism, wherein the opening and closing mechanism comprises a shelf 109, an auxiliary frame 110, two power components and an auxiliary component, wherein the power component comprises a rotating part, a mounting platform 112 and an electric telescopic rod 113, wherein the rotating part comprises a notched gear 114, an active Wheel 115, rotating motor 116, first support frame 117, second support frame 118, protective shell 119 and observation window 120, the auxiliary components include two bow bars 121, multiple screws 122 and two thermal insulation protective layers 111, the above-mentioned scheme solves the problem that the above-mentioned prior art fixes the furnace door 103 on the trolley. When the material requires a higher temperature, the temperature inside the furnace door 103 is high. Workers are easily scalded by the inside of the furnace door 103 when picking up materials in the trolley, which poses a certain safety risk.

[0027] According to this specific embodiment, the vacuum furnace body 101 is provided with two annular grooves for installing the two annular airbags 105 and the two sealing rings 104. The two air pumps 102 are respectively fixedly connected to the two sides of the vacuum furnace body 101 for injecting air. The furnace door 103 is provided on one side of the vacuum furnace body 101 where the two annular grooves are provided, for closing the vacuum furnace body 101. The two sealing rings 104 are provided on the inner side of the furnace door 103, and each sealing ring 104 is located in each annular groove, for fixing the furnace door 103 and increasing the sealing performance between the furnace door 103 and the vacuum furnace body 101. Each of the annular airbags 105 is arranged in each of the annular grooves, and is connected to the air pump 102 through an air outlet pipe and an exhaust pipe, and is located outside the sealing ring 104, and is used to fix the two sealing rings 104. The motor 106 is fixedly connected to the lower side of the vacuum furnace body 101, and is used to drive the driving screw 107. The driving screw 107 is fixedly connected to the output end of the motor 106 and is located in the vacuum furnace body 101, and is used to drive the transport frame 108 to move. The transport frame 108 is threadedly connected to the driving screw 107 and is slidably connected to the vacuum furnace body 101, and is used to place processing materials.

[0028] The shelf 109 is fixedly connected to the vacuum furnace body 101 and is located above the vacuum furnace body 101. The auxiliary frame 110 is fixedly connected to the vacuum furnace body 101 and is located above the vacuum furnace body 101 and on one side of the shelf 109. The two power components are located on both sides of the vacuum furnace body 101. The rotating member is arranged on one side of the vacuum furnace body 101. The mounting platform 112 is arranged on one side of the rotating member. The electric telescopic rod 113 is fixedly connected above the mounting platform 112, and the output rod is fixedly connected to the furnace door 103. When the trolley furnace is opened, the exhaust pipe is opened to release the gas in the annular airbag 105, and the two electric telescopic rods 113 are started to open the furnace door. 103 is ejected until the sealing ring 104 completely leaves the vacuum furnace body 101 for a certain distance, the rotating part is started to drive the mounting platform 112 to rotate, and then the electric telescopic rod 113 and the furnace door 103 are driven to rotate until the furnace door 103 is completely located above the vacuum furnace body 101, and the two electric telescopic rods 113 are started again to lower the furnace door 103 and place it on the shelf 109 and the auxiliary frame 110, so that the inner side of the furnace door 103 can dissipate heat and cool down, and the workload of the two electric telescopic rods 113 is reduced, and then the motor 106 is started, and the driving screw 107 starts to rotate, and the transport frame 108 is automatically moved out of the vacuum furnace body 101, thereby increasing the safety of the device.

[0029] Secondly, the notched gear 114 is rotationally connected to the vacuum furnace body 101 and fixedly connected to the mounting platform 112, and is located outside the vacuum furnace body 101. The rotating motor 116 is fixedly connected to the outside of the vacuum furnace body 101. The driving wheel 115 is fixedly connected to the output end of the rotating motor 116 and meshes with the notched gear 114. When the rotating part is used to work, the two rotating motors 116 are started, and the driving wheel 115 starts to rotate, driving the notched gear 114 meshed therewith to rotate, thereby causing the mounting platform 112 to rotate, thereby driving the two electric telescopic rods 113 to rotate.

[0030] At the same time, the first support frame 117 is fixedly connected to the vacuum furnace body 101 and is located below the mounting platform 112. The second support frame 118 is fixedly connected to the vacuum furnace body 101 and is located on one side of the first support frame 117 and is horizontally arranged with the first support frame 117. When the electric telescopic rod 113 is in a horizontal state, the furnace door 103 closes the vacuum furnace body 101. The mounting platform 112 is placed above the first support frame 117. When the electric telescopic rod 113 is in a vertical state, the mounting platform 112 is placed above the second support frame 118 to support the mounting platform 112 and the electric telescopic rod 113. The furnace door 103 opens the vacuum furnace body 101.

[0031] At the same time, the protective shell 119 is fixedly connected to the vacuum furnace body 101 and is located outside the driving wheel 115. The protective shell 119 is provided with an observation slot. The observation window 120 is fixedly connected to the protective shell 119 and is located in the observation slot. The protective shell 119 protects the driving wheel 115, the rotating motor 116 and the notched gear 114, and the working conditions of each component in the protective shell 119 can be checked through the observation window 120.

[0032] At the same time, two movable grooves are provided at the bottom of the vacuum furnace body 101, and the two arched bars 121 are provided with a plurality of threaded holes. The two arched bars 121 are fixedly connected to the two sides of the transport frame 108, and are slidably connected to the vacuum furnace body 101, and are respectively located in the two movable grooves, and are used for sliding connection with the vacuum furnace body 101, and the connection is made tighter through the arched concave and convex, and the plurality of screws 122 are threadedly connected to the transport frame 108 and the arched bars 121, and are respectively located in each of the threaded holes, and are used for the two The bow bars 121 are installed on both sides of the transport frame 108, and the two heat-insulating protective layers 111 are respectively fixedly connected to the surfaces of the two bow bars 121, so as to protect the two bow bars 121 and make it more difficult for the heat in the trolley furnace to escape, thereby increasing the sealing between the trolley and the furnace body. When the transport frame 108 is moved out, the two bow bars 121 fixed on both sides of the transport frame 108 by multiple screws 122 slide out of the vacuum furnace body 101 along the two moving grooves along with the transport frame 108.

[0033] When the trolley furnace is opened to transport processed materials, the exhaust pipe is opened to release the air in the annular airbag 105, and the two electric telescopic rods 113 are started. Under the support of the first support frame 117 and the mounting platform 112, the furnace door 103 is pushed out until the sealing ring 104 completely leaves the vacuum furnace body 101 for a certain distance, and the two rotating motors 116 are started. The two driving wheels 115 start to rotate, driving the notched gear 114 meshing therewith to rotate, thereby causing the two mounting platforms 112 to rotate, thereby driving the two electric telescopic rods 113 and the furnace door 103 to rotate until the furnace door 103 is completely located above the vacuum furnace body 101, and the two electric telescopic rods 113 are started again to lower the furnace door 103 and place it on the shelf 109 and the The auxiliary frame 110 is arranged on the auxiliary frame 110 so that the inner side of the furnace door 103 can dissipate heat and cool down, and reduce the workload of the two electric telescopic rods 113. At this time, the mounting platform 112 is located above the second supporting frame 118. At the same time, the working conditions of the various components in the protective shell 119 and whether the components are damaged can be viewed through the observation window 120 on the protective shell 119. Subsequently, the motor 106 is started, and the driving screw 107 starts to rotate, and the transport frame 108 is automatically moved out of the vacuum furnace body 101. The furnace door 103 will not be touched when taking materials, thereby avoiding the prior art of fixing the furnace door 103 on the trolley. When the material requires a higher temperature, the temperature inside the furnace door 103 is higher. Workers are easily scalded by the inner side of the furnace door 103 when picking up materials in the trolley, which poses a certain safety risk. The effect of increasing the safety of the device is achieved.

[0034] The second embodiment of the present application is:

[0035] See also Figure 6 , Figure 6 It is a schematic diagram of the overall structure of the second embodiment of the utility model.

[0036] On the basis of the first embodiment, the high-sealing trolley furnace of this embodiment also includes an auxiliary mechanism, and the auxiliary mechanism includes that the high-sealing trolley furnace also includes a vacuum extraction mechanism, and the vacuum extraction mechanism includes a protective box 223, a vacuum pump 224, a vacuum measuring instrument 225, a front end valve 226 and a rear end valve 227.

[0037] Among them, the protective box 223 is arranged on one side of the vacuum furnace body, and is used to install and protect the vacuum pump 224. The vacuum pump 224 is fixedly connected to the protective box 223, and is provided with an inlet pipe and an outlet pipe. The inlet pipe is connected to the vacuum furnace body 101, and is used to extract the air in the vacuum furnace body 101. The inlet pipe and the outlet pipe both pass through the protective box 223. When the vacuum environment inside the trolley furnace is manufactured, the vacuum pump 224 is started. The vacuum pump 224 runs at a high speed, and the air in the vacuum furnace body is sucked in through the inlet pipe and discharged from the outlet pipe, so that a vacuum environment is formed in the vacuum furnace body.

[0038] Secondly, the vacuum measuring instrument 225 is fixedly connected to one side of the vacuum furnace body and passes through the vacuum furnace body, and is used to detect the state inside the vacuum furnace body 101. The front end valve 226 is arranged on the inlet pipe and fixedly connected to the outside of the vacuum furnace body 101, and is used to control the connection between the inside of the vacuum furnace body 101 and the vacuum pump 224. The rear end valve 227 is arranged on the outlet pipe and fixedly connected to the outside of the protective box 223, and is used to control the connection between the outlet pipe of the vacuum pump 224 and the outside world.

[0039] When the trolley furnace needs to be vacuumed, the front end valve 226 and the rear end valve 227 are opened, and then the vacuum pump 224 is started. The vacuum pump 224 runs at a high speed, and the air in the vacuum furnace body is sucked in through the inlet pipe and discharged from the outlet pipe. The vacuum measuring instrument 225 is observed in real time. After a vacuum environment is formed inside the vacuum furnace body 101, the rear end valve 227 is closed to disconnect the outside world from the inside of the vacuum furnace body 101, thereby protecting the vacuum environment inside the vacuum furnace body 101, and then the vacuum pump 224 is closed. After the vacuum pump 224 stops, the front end valve 226 is closed to disconnect the vacuum pump 224 from the inside of the vacuum furnace body 101 to prevent the hot air from damaging the vacuum pump 224 when heating the material, thereby achieving the effect of vacuuming the trolley furnace.

[0040] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A high-sealing trolley furnace, comprising a vacuum furnace body, two air pumps, a furnace door, two sealing rings, two annular air bags, a motor, a driving screw and a transport frame, wherein the vacuum furnace body is provided with two annular grooves, the two air pumps are respectively fixedly connected to the two sides of the vacuum furnace body, the furnace door is arranged on one side of the vacuum furnace body provided with the two annular grooves, the two sealing rings are arranged on the inner side of the furnace door, and each of the sealing rings is located in each of the annular grooves, each of the annular air bags is arranged in each of the annular grooves, and is connected to the air pump through an air outlet pipe and an exhaust pipe, and is located outside the sealing ring, the motor is fixedly connected to the lower side of the vacuum furnace body, the driving screw is fixedly connected to the output end of the motor and is located in the vacuum furnace body, the transport frame is threadedly connected to the driving screw and is slidably connected in the vacuum furnace body, characterized in that Also includes an opening and closing mechanism; The opening and closing mechanism includes a shelf, an auxiliary frame and two power components, the power component includes a rotating part, a mounting platform and an electric telescopic rod, the shelf is fixedly connected to the vacuum furnace body and is located above the vacuum furnace body, the auxiliary frame is fixedly connected to the vacuum furnace body and is located above the vacuum furnace body and located on one side of the shelf, the two power components are located on both sides of the vacuum furnace body, the rotating part is arranged on one side of the vacuum furnace body, the mounting platform is arranged on one side of the rotating part, the electric telescopic rod is fixedly connected to the top of the mounting platform, and the output rod is fixedly connected to the furnace door.

2. The high-sealing trolley furnace according to claim 1, characterized in that: The rotating part includes a notched gear, a driving wheel and a rotating motor. The notched gear is rotationally connected to the vacuum furnace body and fixedly connected to the mounting platform and is located outside the vacuum furnace body. The rotating motor is fixedly connected to the vacuum furnace body. The driving wheel is fixedly connected to the output end of the rotating motor and meshes with the notched gear.

3. The high-sealing trolley furnace according to claim 2, characterized in that: The rotating member also includes a first support frame and a second support frame, the first support frame is fixedly connected to the vacuum furnace body and is located below the mounting platform, the second support frame is fixedly connected to the vacuum furnace body and is located on one side of the first support frame and is horizontally arranged with the first support frame.

4. The high-sealing trolley furnace according to claim 2, characterized in that: The rotating member also includes a protective shell and an observation window. The protective shell is fixedly connected to the vacuum furnace body and is located outside the driving wheel. The protective shell is provided with an observation slot. The observation window is fixedly connected to the protective shell and is located in the observation slot.

5. The high-sealing trolley furnace according to claim 1, characterized in that: The high-sealing trolley furnace also includes an auxiliary component, which is arranged on both sides of the transport frame. The auxiliary component includes two bow bars, multiple screws and two thermal insulation protective layers. The two bow bars are fixedly connected to the two sides of the transport frame and are slidably connected to the vacuum furnace body. Multiple screws are threadedly connected to the transport frame and the bow bars, and the two thermal insulation protective layers are respectively fixedly connected to the surfaces of the two bow bars.

6. The high-sealing trolley furnace according to claim 1, characterized in that: The high-sealing trolley furnace also includes a vacuum extraction mechanism, which includes a protection box and a vacuum pump. The protection box is arranged on one side of the vacuum furnace body. The vacuum pump is fixedly connected to the protection box and is provided with an inlet pipe and an outlet pipe. The inlet pipe is connected to the vacuum furnace body, and the inlet pipe and the outlet pipe both pass through the protection box.

7. The high-sealing trolley furnace according to claim 6, characterized in that: The vacuum extraction mechanism also includes a vacuum measuring instrument, a front end valve and a rear end valve. The vacuum measuring instrument is fixedly connected to one side of the vacuum furnace body and passes through the vacuum furnace body. The front end valve is arranged on the inlet pipe and fixedly connected to the outside of the vacuum furnace body. The rear end valve is arranged on the outlet pipe and fixedly connected to the outside of the protective box.

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