Well type tempering furnace with furnace door capable of being opened through electric lifting

Abstract

The utility model relates to the field of heat treatment equipment. A pit type tempering furnace capable of being opened through electric lifting of a furnace door is provided with the furnace door, a furnace body, a furnace bottom and a heating system, the heating system comprises a plurality of sets of heaters arranged in the furnace body, and the pit type tempering furnace further comprises a furnace door lifting and rotating device for lifting and rotating the furnace door and a furnace door lock catch mechanism for locking the furnace body and the furnace door. And the electric furnace door locking mechanism is linked to automatically lock the furnace door and the furnace body, so that the problems of time and labor waste and low automation degree of manual lifting of the furnace door are solved.

Description

Technical Field

[0001] The utility model relates to the field of heat treatment equipment, in particular to a tempering furnace. Background Art

[0002] Pit-type tempering furnaces are widely used in the field of industrial production. They are the main production equipment in industries such as smelting, forging, manufacturing, heat treatment, and drying. Common tempering furnaces on the market include a furnace body and a furnace door. The furnace body and the furnace door are connected by hinges. Therefore, when in use, operators need to manually rotate the furnace door to open it and put the parts to be tempered into the furnace body. After putting the parts, they need to manually rotate the furnace door to close it again, and then operate the external control switch to heat the furnace body. After the set time, the tempering is completed. In the process of opening and closing the furnace door, operators need to stand near the furnace body, so there are safety hazards. In addition, the furnace door is heavy, laborious to operate, and the degree of automation is low.

[0003] On the other hand, usually, the tempering furnace is basically cooled to room temperature naturally during the cooling and unloading stage, which cannot meet the requirements of the rapid cooling heat treatment process. Utility Model Content

[0004] The utility model aims to provide a pit-type tempering furnace with a furnace door electrically lifted and opened to solve the above technical problems.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0006] A pit-type tempering furnace with an electrically-operated lifting and opening furnace door comprises a furnace door, a furnace body, a furnace bottom and a heating system. The furnace door is located above the furnace body, and protrusions are evenly spaced at the edge. The furnace bottom and the furnace body are detachably connected. The heating system comprises a plurality of groups of heaters arranged in the furnace body, and also comprises a furnace door lifting and rotating device for lifting and rotating the furnace door, and a furnace door locking mechanism for locking the furnace body and the furnace door; the furnace door lifting and rotating device comprises a rotating shaft, a height adjustment mechanism and a rotating drive mechanism; the height adjustment mechanism has a fixed base, on which a lifting platform with adjustable height and a rotating drive mechanism for driving the rotating shaft to rotate are arranged; a guide seat is arranged on the outer wall of the furnace body, and the rotating shaft is movably arranged in the guide seat. The furnace door is connected to the furnace door through a connecting frame, and a rotating gear for driving the rotating shaft to rotate is arranged at the lower part of the rotating shaft, and the bottom of the rotating shaft is rotatably arranged on the lifting platform; the furnace door locking mechanism includes a locking ring arranged at the furnace body opening, a supporting block arranged on the outer wall of the furnace body, and a power mechanism that drives the locking ring to rotate in both directions; the locking ring is a metal circular ring with a semi-I-shaped cross-section, and the concave direction faces the furnace body. The lower end face of the locking ring is connected to the supporting block, and the inner diameter of the locking ring and the outer diameter of the furnace body are clearance-matched; the upper end face of the locking ring is evenly spaced with grooves, and the number and shape are the same as the number and shape of the protrusions on the edge of the furnace door; a mounting bracket is arranged on the outer wall of the furnace body, and a pushing bracket is arranged on the outer side of the locking ring, and the mounting bracket and the pushing bracket are connected at both ends of the power mechanism.

[0007] The connecting frame is a fork-shaped bracket, and has three connecting points with the top of the furnace door, and the three connecting points are the three vertices of an equilateral triangle.

[0008] The heaters are arranged in multiple groups along the inner wall of the furnace body. The multiple groups of heaters can be divided into multiple zones for furnace temperature control. At the same time, the power is reasonably distributed according to the temperature rise law using the uniform temperature wire method to ensure that the furnace temperature is uniform and consistent, and to ensure that the tempering temperature is accurately controlled within the required range to avoid the quality of the workpiece due to excessively high or low temperature.

[0009] The lifting and rotating device first drives the shaft to move upward through the lifting platform of the height adjustment mechanism, and then the shaft drives the furnace door to lift vertically upward and separate from the furnace opening. Under the action of the rotating drive mechanism, the shaft rotates, driving the furnace door to move horizontally from above the furnace opening, making way for the upward passage of the furnace opening. The entire furnace opening process saves time and effort, and the operators do not need to stand near the furnace body, thereby ensuring their safety. In addition, the upward passage of the furnace opening is not blocked by the furnace door, and materials can enter and exit more smoothly. In conjunction with the material operation system, automatic loading and unloading of materials can be realized.

[0010] The furnace door lock mechanism is a safety precaution to prevent the furnace door from being accidentally opened when the tempering furnace is working and to prevent high-temperature gas from injuring the operators.

[0011] The lower end face of the locking ring is placed on the supporting block and can rotate around the furnace body opening. The grooves arranged on the upper end face of the locking ring have the same shape and number as the protrusions on the edge of the furnace door. When the protrusion and the groove are opposite to each other, the protrusion of the furnace door can pass through the groove on the upper end face of the locking ring, and the furnace door can reach the furnace body opening. When the power mechanism drives the locking ring to rotate a certain angle, the protrusion of the furnace door and the groove on the upper end face of the locking ring are misaligned. At this time, the protrusion of the furnace door is blocked by the non-groove part of the upper end face of the locking ring and is restricted from leaving the furnace body, thereby achieving the locking effect of the furnace door and the furnace body.

[0012] Furthermore, the base of the height adjustment mechanism is provided with a height adjustment power cylinder and a lifting motor driving the height adjustment power cylinder, and the output power rod of the height adjustment power cylinder is connected to the lifting platform; the base is arranged on a mounting support, and the mounting support is fixedly connected to the outer wall of the furnace body.

[0013] The furnace door height is adjusted electrically. On the one hand, the electric motor has the advantages of high response and high torque. On the other hand, the electric motor is easy to automate and integrate, which makes it easy to realize unmanned workshops, reduce labor costs and improve production efficiency.

[0014] Furthermore, the rotary drive mechanism includes a rotary motor, a reduction gear and a driving gear; the rotary motor is connected to the reduction gear, the reduction gear is connected to the driving gear, and when the rotating shaft is in the raised position, the rotary gear at the bottom of the rotating shaft and the driving gear enter into meshing connection.

[0015] When the furnace door is in the closed state, the rotating gear arranged at the lower part of the rotating shaft is located below the driving gear, and there is no meshing connection between the rotating gear and the driving gear. At this time, the furnace door cannot move laterally. This restriction ensures the safety of the furnace door when it moves. When the output power rod of the height adjustment power cylinder pushes the lifting platform to rise, the rotating gear gradually approaches the driving gear and finally completes the meshing connection. At this time, the rotating motor starts, and the high speed of the motor is decelerated by the reduction box and transmitted to the driving gear at a low speed. The driving gear drives the rotating gear, driving the rotating shaft to rotate radially, thereby realizing the lateral movement of the furnace door.

[0016] Furthermore, the power mechanism is an electric push rod mechanism having a lock drive motor, and the lock drive motor can drive the push rod to extend and retract.

[0017] The lock power mechanism adopts an electric push rod mechanism. The lock drive motor is easy to use for automated integrated control and can be linked with the furnace door lifting mechanism to realize an unmanned workshop, reduce labor costs and improve production efficiency.

[0018] Furthermore, a convection fan is arranged on the top of the furnace door, the convection fan shaft passes through the furnace body, and blades are arranged at the end of the convection fan shaft.

[0019] The convection fan realizes circulating ventilation in the furnace, so that the heat flow can flow fully in the furnace, ensuring that the uniformity of temperature at various locations in the furnace under low temperature conditions is controlled within ±5°C, so that the workpiece can achieve uniform tempering effect.

[0020] Furthermore, it also includes an external cooling system for cooling the furnace body, and the external cooling system includes a lower head of a heat exchanger, a shell and tube heat exchanger, an air filter chamber, a blower, an air outlet duct and a return air duct; the blower is installed on the air filter chamber, the air filter chamber is connected to the shell and tube heat exchanger, and the shell and tube heat exchanger is connected to the lower head of the heat exchanger; the air outlet of the blower is connected to the air outlet duct, and the other end of the air outlet duct is connected to the upper end of the furnace body; the return air outlet of the lower head of the heat exchanger is connected to the return air duct, and the other end of the return air duct is connected to the lower end of the furnace body.

[0021] The external cooling system is installed next to the tempering furnace. Because it is an external form, the overall height of the equipment can be reduced. The external cooling device is easy to connect, and the inlet and outlet are connected with national standard flanges; the high-temperature gas enters from the lower head of the heat exchanger from the inside of the furnace body, cools down through the shell and tube heat exchanger, and then the centrifugal impeller blower discharges the gas from the volute outlet into the furnace body for circulation and cooling. The shell side of the shell and tube heat exchanger is cooling water, and the tube side is gas. The air filter chamber at the volute inlet is designed with an air intake to avoid gas impact.

[0022] Anchor bolt holes are provided at the bottom of the device to prevent it from tipping over, and the blower motor is placed vertically to reduce noise during operation.

[0023] Furthermore, the shell and tube heat exchanger is provided with a water inlet on the upper side and a water outlet for discharging hot air on the lower side.

[0024] The external cooling system uses water cooling for cooling, which can accelerate the rapid cooling of the tempered workpiece and meet the requirements of the rapid cooling heat treatment process.

[0025] Furthermore, it also includes a workpiece support, which is fixedly arranged on the furnace bottom.

[0026] The furnace bottom and furnace body are installed in a detachable manner, and the workpiece support is installed on the furnace bottom. When installing the workpiece support, it is first installed separately on the furnace bottom. After the installation and commissioning is completed, it is installed on the furnace body as a whole with the furnace bottom, so that the equipment can be installed conveniently; when the workpiece support needs later maintenance, the furnace bottom can be removed from the furnace body, and the workpiece support can be maintained on the furnace bottom without entering the narrow furnace body for maintenance.

[0027] The beneficial effect of the utility model is that the furnace door is lifted and lowered by the electric lifting mechanism of the furnace door, and the electric locking mechanism of the furnace door is linked to automatically lock the furnace door and the furnace body, which overcomes the laborious operation of manually opening and closing the furnace door and the problem of low automation, and can make the entire furnace opening process more convenient, save manpower, and improve operation safety. After the furnace door is removed as a whole, the material import and export channels are more unobstructed, and cooperate with the material operation system to realize unmanned production modes such as automatic opening of the furnace door, automatic loading and unloading of materials, and automatic temperature control, thereby improving productivity. In the tempering and cooling process, the introduction of an external cooling system to assist in rapid cooling can meet the process requirements of rapid cooling and improve the efficiency of heat treatment processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0029] Figure 1 It is a front perspective schematic diagram of the utility model;

[0030] Figure 2 It is a partial schematic diagram of the lifting and rotating device of the utility model;

[0031] Figure 3 It is a partial schematic diagram of the lifting components of the lifting and rotating device of the utility model;

[0032] Figure 4 It is a cross-sectional view of the utility model.

[0033] Explanation of symbols:

[0034] 1. Furnace door; 2. Furnace body; 3. Furnace bottom; 20. Connecting frame; 21. Rotating shaft; 22. Rotating drive mechanism; 23. Height adjustment mechanism; 24. Guide seat; 25. Convection fan; 26. Heater; 27. Workpiece support; 100. Locking ring; 101. Support block; 102. Locking drive motor; 103. Power mechanism; 104. Mounting bracket; 105. Pushing bracket; 220. Rotating gear; 221. Driving gear; 222. Speed ​​reducer; 223. Rotating motor; 230. Lifting motor; 231. Height adjustment power cylinder; 300. Blower; 301. Air filter chamber; 302. Shell and tube heat exchanger; 303. Lower head of heat exchanger; 304. Air outlet duct; 305. Return air duct; 306. Water inlet; 307. Water outlet. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present invention more understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0038] Secondly, the "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that can be included in at least one implementation of the utility model. The "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0039] Example 1

[0040] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a pit-type tempering furnace with an electrically-operated furnace door is provided, comprising a furnace door 1, a furnace body 2, a furnace bottom 3 and a heating system. The furnace door 1 is located above the furnace body 2, and is provided with protrusions at evenly spaced intervals at the edge. The furnace bottom 3 and the furnace body 2 are detachably connected. The heating system comprises a plurality of groups of heaters 26 arranged in the furnace body 2, and also comprises a furnace door lifting and rotating device for lifting and rotating the furnace door, and a furnace door locking mechanism for locking the furnace body 2 and the furnace door 1; the furnace door lifting and rotating device comprises a rotating shaft 21, a height adjustment mechanism 23 and a rotating driving mechanism 22; the height adjustment mechanism 23 has a fixed base, on which a lifting platform with adjustable height and a rotating driving mechanism 22 for driving the rotating shaft 21 to rotate are provided; a guide seat 24 is provided on the outer wall of the furnace body 2, and the rotating shaft 21 is movably arranged in the guide seat 24, and the upper part of the rotating shaft 21 is connected to the furnace door 1 through a connecting frame 20 , a rotating gear 220 for driving the rotating shaft 21 to rotate is arranged at the lower part of the rotating shaft 21, and the bottom of the rotating shaft 21 is rotatably arranged on the lifting platform; the furnace door locking mechanism includes a locking ring 100 arranged at the opening of the furnace body 2, a supporting block 101 arranged on the outer wall of the furnace body 2, and a power mechanism 103 for driving the locking ring 100 to rotate in both directions; the locking ring 100 is a metal circular ring with a semi-I-shaped cross-section, and the concave direction faces the furnace body 2. The lower end face of the locking ring 100 is connected to the supporting block 101, and the inner diameter of the locking ring 100 and the outer diameter of the furnace body 2 are clearance-matched; the upper end face of the locking ring 100 is evenly spaced with grooves, and the number and shape are the same as the number and shape of the protrusions on the edge of the furnace door 1; a mounting bracket 104 is arranged on the outer wall of the furnace body 2, and a pushing bracket 105 is arranged on the outer side of the locking ring 100, and the mounting bracket 104 and the pushing bracket 105 are connected at both ends of the power mechanism 103.

[0041] In this example, the connecting frame 20 can be in the shape of a U-shaped bracket, a V-shaped bracket, etc., and at least three connecting points are set with the top of the furnace door 1. The three connecting points are preferably distributed in an equilateral triangle.

[0042] In this example, multiple groups of heaters 26 are arranged along the inner wall of the furnace body 2. Multiple groups of heaters 26 can be divided into multiple zones for furnace temperature control. At the same time, the power is reasonably distributed according to the temperature rise law using the uniform temperature wire method to ensure that the furnace temperature is uniform and consistent, and to ensure that the tempering temperature is accurately controlled within the required range to avoid a decrease in workpiece quality due to excessively high or low temperatures.

[0043] In this example, the lifting and rotating device first drives the rotating shaft 21 to move upward through the lifting platform of the height adjustment mechanism 23, and then the rotating shaft 21 drives the furnace door 1 to lift vertically upward and separate from the opening of the furnace body 2. Under the action of the rotating drive mechanism 22, the rotating shaft 21 is driven to rotate, driving the furnace door 1 to move horizontally from above the opening of the furnace body 2, so as to create a passage for the furnace body 2 to open upward. The entire furnace opening process saves time and effort, and the operators do not need to stand near the furnace body 2, thereby ensuring the safety of the operators. In addition, the passage for the furnace body 2 to open upward is not blocked by the furnace door 1, and the material entry and exit is smoother. In conjunction with the material operation system, automatic loading and unloading of materials can be realized.

[0044] In this example, the locking mechanism of the furnace door 1 can be used as a safety precaution to prevent the furnace door 1 from being accidentally opened when the tempering furnace is working, thereby preventing the high-temperature gas from injuring the operating personnel.

[0045] In this example, at least three support blocks 101 need to be provided, and the lower end face of the locking ring 100 is placed on the support block 101 and can rotate around the opening of the furnace body 2. The shape and number of the grooves provided on the upper end face of the locking ring 100 are consistent with the shape and number of the protrusions on the edge of the furnace door 1. When the protrusion and the groove are relative to each other, the protrusion of the furnace door 1 can pass through the groove on the upper end face of the locking ring 100, and the furnace door 1 can reach the opening of the furnace body 2. When the power mechanism 103 drives the locking ring 100 to rotate a certain angle, the protrusion of the furnace door 1 and the groove on the upper end face of the locking ring 100 are misaligned. At this time, the protrusion of the furnace door 1 is blocked by the non-groove part of the upper end face of the locking ring 100, and is restricted from leaving the furnace body 2, thereby achieving the locking effect of the furnace door 1 and the furnace body 2.

[0046] Reference Figure 3 As shown, the base of the height adjustment mechanism 23 is provided with a height adjustment power cylinder 231 and a lifting motor 230 driving the height adjustment power cylinder 231, and the output power rod of the height adjustment power cylinder 231 is connected to the lifting platform; the base is arranged on a mounting support, and the mounting support is fixedly connected to the outer wall of the furnace body 2.

[0047] In this example, the height of the furnace door 1 is adjusted electrically. On the one hand, the electric motor has the advantages of high response and high torque. On the other hand, the electric motor is easy to automate and integrate, which makes it easy to realize an unmanned workshop, reduce labor costs, and improve production efficiency.

[0048] Reference Figure 2 As shown, the rotary drive mechanism 22 includes a rotary motor 223, a reduction box 222 and a driving gear 221; the rotary motor 223 is connected to the reduction box 222, and the reduction box 222 is connected to the driving gear 221. When the rotating shaft 21 is in the raised position, the rotary gear 220 at the lower part of the rotating shaft 21 and the driving gear 221 enter into meshing connection.

[0049] In this example, when the furnace door 1 is in a closed state, the rotating gear 220 provided at the lower part of the rotating shaft 21 is located below the driving gear 221, and the rotating gear 220 and the driving gear 221 are not in meshing connection. At this time, the furnace door 1 cannot move laterally. This restriction ensures the safety of the lateral movement of the furnace door 1. When the output power rod of the height adjustment power cylinder 231 pushes the lifting platform to rise, the rotating gear 220 gradually approaches the driving gear 221 and finally completes the meshing connection after the furnace door is raised to a certain height. At this time, the rotating motor 223 is started, and the motor speed is decelerated by the reduction box 222 and transmitted to the driving gear 221. The driving gear 221 drives the rotating gear 220, driving the rotating shaft 21 to rotate, thereby realizing that the connecting frame moves the furnace door 1 laterally.

[0050] The power mechanism 103 is an electric push rod mechanism having a lock drive motor 102, and the lock drive motor 102 can drive the push rod to extend and retract.

[0051] In this example, the lock power mechanism 103 adopts an electric push rod mechanism, and can also choose to use a standard power cylinder such as a pneumatic cylinder, an electric cylinder, a hydraulic cylinder, etc. It is preferred to use a push rod mechanism with a motor, which is convenient for automated integrated control and can be linked with the furnace door 1 lifting mechanism to realize an unmanned workshop, reduce labor costs, and improve production efficiency.

[0052] Reference Figure 4 As shown, a convection fan 25 is arranged on the top of the furnace door 1, the convection fan shaft passes through the furnace body 2, and blades are arranged at the end of the convection fan shaft.

[0053] In this example, the convection fan 25 drives the blades to achieve circulating ventilation in the furnace, so that the heat flow can flow fully in the furnace, ensuring that the uniformity of the temperature at various locations in the furnace under low temperature conditions is controlled within ±5°C, thereby achieving a uniform tempering effect on the workpiece.

[0054] Reference Figure 1 As shown, it also includes an external cooling system for cooling the furnace body 2, and the external cooling system includes a lower head 303 of the heat exchanger, a shell and tube heat exchanger 302, an air filter chamber 301, a blower 300, an air outlet duct 304 and a return air duct 305; the blower 300 is installed on the air filter chamber 301, the air filter chamber 301 is connected to the shell and tube heat exchanger 302, and the shell and tube heat exchanger 302 is connected to the lower head 303 of the heat exchanger; the air outlet of the blower 300 is connected to the air outlet duct 304, and the other end of the air outlet duct 304 is connected to the upper end of the furnace body 2; the return air outlet of the lower head 303 of the heat exchanger is connected to the return air duct 305, and the other end of the return air duct 305 is connected to the lower end of the furnace body 2.

[0055] In this example, the external cooling system is installed next to the tempering furnace. Because it is an external form, the overall height of the equipment can be reduced. The external cooling device is easy to connect, and the outlet and return air ports are both connected by national standard flanges; the high-temperature gas enters from the lower head 303 of the heat exchanger from the inside of the furnace body 2, is cooled by the shell and tube heat exchanger 302, and then the centrifugal impeller blower 300 discharges the gas from the outlet into the furnace body 2 for circulation and cooling. The shell side of the shell and tube heat exchanger 302 is cooling water, and the tube side is gas. The air filter chamber 301 at the air inlet of the blower is designed with an air intake to avoid gas shock.

[0056] Anchor bolt holes are provided at the bottom of the device to prevent it from tipping over. The blower 300 motor is placed vertically to reduce noise during operation.

[0057] The shell and tube heat exchanger 302 is provided with a water inlet 306 on the upper side and a water outlet 307 for discharging hot air on the lower side.

[0058] In this example, the external cooling system uses water cooling for cooling, which can accelerate the rapid cooling of the tempered workpiece and meet the requirements of the rapid cooling heat treatment process.

[0059] A workpiece support 27 is also included, and the workpiece support 27 is fixedly arranged on the furnace bottom 3 .

[0060] In this example, the furnace bottom 3 and the furnace body 2 are installed in a detachable manner, and the workpiece support 27 is installed on the furnace bottom 3. When the workpiece support 27 is installed, it is first installed separately on the furnace bottom 3. After the installation and debugging are completed, it is installed on the furnace body 2 as a whole with the furnace bottom 3, so that the equipment can be installed conveniently; when the workpiece support 27 needs later maintenance, the furnace bottom 3 can be removed from the furnace body 2, and the workpiece support 27 can be maintained on the furnace bottom 3 without entering the narrow furnace body 2 for maintenance.

[0061] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0062] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A pit-type tempering furnace with an electrically-operated lifting and opening furnace door, comprising a furnace door, a furnace body, a furnace bottom and a heating system, wherein the furnace door is located above the furnace body, and protrusions are evenly spaced at the edge, the furnace bottom and the furnace body are detachably connected, and the heating system comprises a plurality of groups of heaters arranged in the furnace body, characterized in that: It also includes a furnace door lifting and rotating device for lifting and rotating the furnace door and a furnace door locking mechanism for locking the furnace body and the furnace door; The furnace door lifting and rotating device comprises a rotating shaft, a height adjustment mechanism and a rotating drive mechanism; The height adjustment mechanism has a fixed base, on which a height-adjustable lifting platform and a rotating drive mechanism for driving the rotating shaft are arranged; The outer wall of the furnace body is provided with a guide seat, the rotating shaft is movably arranged in the guide seat, the upper part of the rotating shaft is connected to the furnace door through a connecting frame, the lower part of the rotating shaft is provided with a rotating gear for driving the rotating shaft to rotate, and the bottom of the rotating shaft is rotatably arranged on the lifting platform; The furnace door locking mechanism comprises a locking ring arranged at the furnace body opening, a supporting block arranged at the outer wall of the furnace body, and a power mechanism for driving the locking ring to rotate in both directions; The locking ring is a metal ring with a semi-I-shaped cross section, with the concave direction facing the furnace body. The lower end surface of the locking ring is connected to the support block, and the inner diameter of the locking ring and the outer diameter of the furnace body are in clearance. The upper end surface of the lock ring is provided with grooves at even intervals, and the number and shape are the same as the number and shape of the protrusions on the edge of the furnace door; The outer wall of the furnace body is provided with a mounting bracket, the outer side of the locking ring is provided with a pushing bracket, and the mounting bracket and the pushing bracket are connected at both ends of the power mechanism.

2. A pit-type tempering furnace with electric lifting and opening of furnace door according to claim 1, characterized in that: The base of the height adjustment mechanism is provided with a height adjustment power cylinder and a lifting motor driving the height adjustment power cylinder, and the output power rod of the height adjustment power cylinder is connected to the lifting platform; The base is arranged on a mounting support, and the mounting support is fixedly connected to the outer wall of the furnace body.

3. The pit-type tempering furnace with electric lifting and opening of furnace door according to claim 1 is characterized in that: The rotary drive mechanism comprises a rotary motor, a reduction gearbox and a driving gear; The rotating motor is connected to the reduction box, and the reduction box is connected to the driving gear. When the rotating shaft is in the raised position, the rotating gear and the driving gear at the lower part of the rotating shaft enter into meshing connection.

4. The pit-type tempering furnace with electric lifting and opening of furnace door according to claim 1 is characterized in that: The power mechanism is an electric push rod mechanism with a lock drive motor, and the lock drive motor can drive the push rod to extend and retract.

5. The pit-type tempering furnace with electric lifting and opening of furnace door according to claim 1 is characterized in that: A convection fan is arranged on the top of the furnace door, a shaft of the convection fan passes through the furnace body, and blades are arranged at the end of the convection fan shaft.

6. The pit-type tempering furnace with electric lifting and opening of furnace door according to claim 1 is characterized in that: It also includes an external cooling system for cooling the furnace body, and the external cooling system includes a lower head of a heat exchanger, a shell and tube heat exchanger, an air filter chamber, a blower, an air outlet duct and a return air duct; The blower is installed on the air filter chamber, the air filter chamber is connected to the shell and tube heat exchanger, and the shell and tube heat exchanger is connected to the lower head of the heat exchanger; The blower outlet is connected to the air outlet duct, and the other end of the air outlet duct is connected to the upper end of the furnace body; The return air port of the lower head of the heat exchanger is connected to the return air duct, and the other end of the return air duct is connected to the lower end of the furnace body.

7. The pit-type tempering furnace with electric lifting and opening of furnace door according to claim 6, characterized in that: The shell and tube heat exchanger has a water inlet on the upper side and a water outlet for discharging hot air on the lower side.

8. The pit-type tempering furnace with electric lifting and opening of furnace door according to claim 1 is characterized in that: Also included is a workpiece support, which is fixedly arranged at the furnace bottom.

Images