A box-type high-temperature tempering furnace with ammonia cracking gas as protective atmosphere

Abstract

The invention discloses a box-type high-temperature tempering furnace with ammonia cracking gas as a protective atmosphere, which relates to the technical field of tempering furnaces. The scheme includes a furnace shell, a furnace door lifting mechanism is installed on one side of the outer surface of the furnace shell, a furnace lining is fixedly connected to the inside of the furnace shell, a water-cooled stirring motor is fixedly installed through the top of the furnace shell, an explosion-proof port is opened on one side of the top of the furnace shell, an inner cooling circulation device is installed on the outer surface of the furnace shell and on the side away from the furnace door lifting mechanism, an exhaust gas discharge port is fixedly installed through one side of the outer surface of the furnace shell, and a fast smoke exhaust system matched with the exhaust gas discharge port is installed on one side of the outer surface of the furnace shell. The cylinder operation of the invention can press the furnace door body, thereby improving the sealing of the furnace door, and nitrogen ammonia cracking gas is used as the protective atmosphere, which can effectively prevent the oxidation of the workpiece. The inner cooling circulation device is used, and when the workpiece needs an inner cooling process, the furnace temperature can be quickly cooled, which greatly reduces the total time of the tempering process and improves efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of tempering furnaces, in particular to a box-type high-temperature tempering furnace using ammonia cracking gas as a protective atmosphere. Background Art

[0002] The tempering furnace is used for tempering of general metal parts in air, as well as quenching, annealing and aging heat treatment of light alloy parts such as aluminum alloy die-castings, pistons, aluminum plates, etc. The outer shell is welded by steel plates and steel sections, and the trolley is welded by steel sections and steel plates. The trolley reduces heat radiation and convection losses through soft contact with the furnace lining and sand sealing mechanism, effectively ensuring the sealing of the furnace body.

[0003] At present, the existing high-temperature tempering furnace uses the dead weight of the furnace door to seal the furnace door and the furnace body. When the workpiece is heated in the high-temperature tempering furnace, the air in the furnace is not exhausted cleanly, the sealing effect of the furnace door is poor, and the surface of the product will be oxidized during high-temperature tempering. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a box-type high-temperature tempering furnace using ammonia cracking gas as a protective atmosphere, which solves the problems raised in the background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a box-type ammonia cracking gas protective atmosphere high-temperature tempering furnace, comprising a furnace shell, a furnace door lifting mechanism is installed on one side of the outer surface of the furnace shell, a furnace lining is fixedly connected to the inside of the furnace shell, an air-cooled stirring motor is fixedly installed through the top of the furnace shell, an explosion-proof port is opened on one side of the top of the furnace shell, an inner cooling circulation device is installed on the outer surface of the furnace shell and away from the furnace door lifting mechanism, an exhaust gas discharge port is fixedly installed through one side of the outer surface of the furnace shell, a rapid smoke exhaust system matched with the exhaust gas discharge port is installed on one side of the outer surface of the furnace shell, an ammonia cracking device is installed on one side of the outer surface of the furnace shell, and a gas distribution system matched with the ammonia cracking device is installed on the outer surface of the furnace shell.

[0006] Preferably, the furnace door lifting mechanism includes two slide rails symmetrically fixedly connected to one side of the outer surface of the furnace shell, the furnace door body is slidably connected between the two slide rails, a bracket is fixedly installed on the top of the furnace shell, a winding shaft is rotatably connected to the top of the bracket, a lifting motor is fixedly installed on the top of the bracket, the outer surface of the winding shaft and the output shaft of the lifting motor are fixedly sleeved with sprockets, the two sprockets are connected by a chain, and a lifting rope is fixedly connected between the outer surface of the winding shaft and the top of the furnace door body.

[0007] Through the above technical solution, when in use, the operation of the lifting motor can drive the winding shaft to rotate through the sprocket and the chain, and then can drive the furnace door body to rise or fall through lifting, thereby realizing the opening and closing of the furnace door body.

[0008] Preferably, two cylinders are symmetrically rotatably connected on both sides of the outer surface of the furnace shell, the movable ends of the cylinders are rotatably connected to special-shaped pressure rods, the outer surface of the furnace shell is fixedly connected to connecting blocks rotatably connected to the special-shaped pressure rods, and the outer surface of the furnace door body is fixedly connected to pressure blocks matching the special-shaped pressure rods on both sides.

[0009] Through the above technical solution, when the furnace door body is closed, the cylinders on both sides are started. The cylinders can drive the special-shaped pressure rods to rotate under the limit of the connecting block, so as to press the pressure blocks on both sides of the furnace door body, and then the furnace door body can be pressed tightly against the furnace shell, thereby improving the sealing of the entire high-temperature tempering furnace.

[0010] Preferably, the internal cooling circulation device includes a stainless steel heat exchanger arranged on the outside of the furnace shell, and two flange openings are fixedly connected to each other on one side of the outer surface of the furnace shell, one end of a single flange opening is fixedly connected to one end of the stainless steel heat exchanger, and the other end of the stainless steel heat exchanger is fixedly connected to an internal cooling fan, a fan is installed inside the internal cooling fan, and a high-temperature pneumatic butterfly valve is fixedly connected between the other end of the internal cooling fan and another flange opening.

[0011] Through the above technical solution, the two flange openings extending from the rear wall of the tempering furnace, when the workpiece needs an internal cooling process, open the high-temperature pneumatic butterfly valve, turn on the internal cooling fan, and exchange heat through the stainless steel heat exchanger, so that the hot air in the furnace can be extracted and transported into cold air, thereby quickly cooling the furnace temperature, greatly reducing the total time of the tempering process, and improving efficiency.

[0012] Preferably, the rapid smoke exhaust system includes two jet tubes that are fixedly installed on the top and side of the furnace shell, both jet tubes are fixedly installed with a high-temperature electric ball valve, the other ends of the two jet tubes are commonly fixedly connected to a hair dryer, and the ends of the two jet tubes close to the hair dryer are fixedly installed with a manual ball valve.

[0013] Through the above technical scheme, oil smoke will be generated during high-temperature tempering after quenching of the workpiece. Open the high-temperature electric ball valve and turn on the hair dryer. The hair dryer can blow air out of the jet pipe. The amount of air entering the furnace is controlled by the manual ball valve. According to the size of the jet, the oil smoke in the furnace is quickly discharged from the exhaust port and then discharged into the fume hood, thereby ensuring the appearance of the workpiece; when there is no oil smoke in the furnace, close the high-temperature electric ball valve to ensure the sealing effect of the furnace.

[0014] Preferably, the matching gas system includes an exhaust hood fixedly mounted on the top of the furnace shell, one end of the exhaust hood cooperates with the exhaust gas discharge port, and a nitrogen flow controller, an ammonia flow controller and an air flow controller are fixedly mounted in sequence on one side of the outer surface of the furnace shell.

[0015] Through the above technical solution, in order to prevent the workpiece from oxidation, nitrogen plus ammonia cracking gas is used as the protective atmosphere, and the ammonia cracking gas is prepared by the ammonia cracking device. After the workpiece enters the furnace, the nitrogen is replaced, and then the ammonia cracking gas is introduced for protection. The equipment is equipped with a set of automatic exhaust ignition and flame detection devices, which can automatically ignite the flame when the process is carried out to fill the ammonia cracking gas and keep the flame burning. If the flame goes out during the process, an alarm is given immediately to warn the user and deal with the fault as soon as possible; prevent the leakage of ammonia cracking gas from causing safety accidents.

[0016] The present invention provides a box-type high-temperature tempering furnace using ammonia cracking gas as a protective atmosphere, which has the following beneficial effects:

[0017] The box-type high-temperature tempering furnace with ammonia cracking gas as protective atmosphere can press the furnace door body when the cylinder is in use, thereby improving the sealing of the furnace door, and using nitrogen ammonia cracking gas as the protective atmosphere can effectively prevent the oxidation of the workpiece; after the workpiece enters the furnace, the nitrogen is replaced, and then the ammonia cracking gas is introduced for protection; the side walls of the heating chamber are made of insulation bricks and the furnace roof is made of vacuum refractory forming plates, which ensure the furnace environment under the high temperature state in the furnace; an internal cooling circulation device is adopted, and when the workpiece needs an internal cooling process, starting the internal cooling circulation device can quickly cool the furnace temperature, greatly reducing the total tempering process time, improving efficiency, and solving the oxidation of the workpiece during tempering in the high-temperature tempering furnace of the old production line. When tempering is protected by ammonia cracking gas, the workpiece surface after tempering has the advantages of no oxidation, good brightness, small deformation, etc.; the nitrogen protection system eliminates safety hazards such as fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the present invention;

[0019] Figure 2 It is a left side view of the present invention;

[0020] Figure 3 It is a right side view of the present invention;

[0021] Figure 4 A top view of the present invention;

[0022] Figure 5 It is a rear view of the present invention;

[0023] Figure 6 It is a front view of the furnace door lifting mechanism of the present invention;

[0024] Figure 7 It is a left side view of the furnace door lifting mechanism of the present invention;

[0025] Figure 8 A top view of the furnace door lifting mechanism of the present invention;

[0026] Fig. 9It is a partial structural schematic diagram of the furnace door lifting mechanism of the present invention;

[0027] Fig.10 It is a front view of the internal cooling circulation device of the present invention;

[0028] Fig.11 A top view of the internal cooling circulation device of the present invention;

[0029] Fig.12 It is a front view of the rapid smoke exhaust system of the present invention;

[0030] Fig.13 A side view of the rapid smoke exhaust system of the present invention;

[0031] Fig.14 It is a structural schematic diagram of the gas distribution system of the present invention.

[0032] In the figure, 1. furnace door lifting mechanism; 101. lifting motor; 102. sprocket; 103. bracket; 104. slide rail; 105. furnace door body; 106. cylinder; 107. special-shaped pressure rod; 108. connecting block; 109. pressure block; 2. explosion-proof port; 3. furnace shell; 4. air-cooled stirring motor; 5. furnace lining; 6. internal cooling circulation device; 601. high-temperature pneumatic butterfly valve; 602. stainless steel heat exchanger; 603. internal cooling fan; 604. fan; 7. exhaust gas outlet; 8. fast smoke exhaust system; 801. jet pipe; 802. high-temperature electric ball valve; 803. hair dryer; 804. manual ball valve; 9. ammonia cracking device; 10. gas distribution system; 1001. exhaust hood; 1002. nitrogen flow controller; 1003. ammonia flow controller; 1004. air flow controller. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0034] like Figures 1 to 5As shown, a box-type ammonia cracking gas protective atmosphere high-temperature tempering furnace comprises a furnace shell 3, a furnace door lifting mechanism 1 is installed on one side of the outer surface of the furnace shell 3, a furnace lining 5 is fixedly connected to the inside of the furnace shell 3, an air-cooled stirring motor 4 is fixedly installed through the top of the furnace shell 3, an explosion-proof port 2 is opened on one side of the top of the furnace shell 3, an inner cooling circulation device 6 is installed on the outer surface of the furnace shell 3 and away from the furnace door lifting mechanism 1, an exhaust gas discharge port 7 is fixedly installed through one side of the outer surface of the furnace shell 3, a fast smoke exhaust system 8 matched with the exhaust gas discharge port 7 is installed on one side of the outer surface of the furnace shell 3, an ammonia cracking device 9 is installed on one side of the outer surface of the furnace shell 3, and a gas distribution system 10 matched with the ammonia cracking device 9 is installed on the outer surface of the furnace shell 3.

[0035] The furnace lining 5 includes side walls and furnace roof. The side walls are made of insulation bricks and the furnace roof is made of vacuum refractory forming plates, which ensure the furnace environment under high temperature conditions. Example 2

[0036] like Figure 6 and Fig. 9 As shown, the furnace door lifting mechanism 1 includes two slide rails 104 symmetrically fixedly connected to one side of the outer surface of the furnace shell 3, a furnace door body 105 is slidably connected between the two slide rails 104, a bracket 103 is fixedly installed on the top of the furnace shell 3, a winding shaft is rotatably connected to the top of the bracket 103, a lifting motor 101 is fixedly installed on the top of the bracket 103, a sprocket 102 is fixedly sleeved on the outer surface of the winding shaft and the output shaft of the lifting motor 101, the two sprockets 102 are connected by a chain, and a lifting rope is fixedly connected between the outer surface of the winding shaft and the top of the furnace door body 105.

[0037] When in use, the lifting motor 101 can drive the winding shaft to rotate through the sprocket 102 and the chain, and then can drive the furnace door body 105 to rise or fall through lifting, thereby realizing the opening and closing of the furnace door body 105.

[0038] Two cylinders 106 are symmetrically rotatably connected on both sides of the outer surface of the furnace shell 3, and the movable end of the cylinder 106 is rotatably connected to a special-shaped pressure rod 107. The outer surface of the furnace shell 3 is fixedly connected to a connecting block 108 rotatably connected to the special-shaped pressure rod 107, and the outer surface of the furnace door body 105 is fixedly connected to a pressure block 109 matching the special-shaped pressure rod 107 on both sides.

[0039] When the furnace door body 105 is closed, the cylinders 106 on both sides are started. The cylinders 106 can drive the special-shaped pressure rods 107 to rotate when running under the limit of the connecting block 108, so as to press the pressure blocks 109 on both sides of the furnace door body 105, so that the furnace door body 105 can be tightly pressed against the furnace shell 3, thereby improving the sealing of the entire high-temperature tempering furnace. Example 3

[0040] like Fig.10 and Fig.11 As shown, the internal cooling circulation device 6 includes a stainless steel heat exchanger 602 arranged on the outside of the furnace shell 3, and one side of the outer surface of the furnace shell 3 is fixed with two flange openings that are interconnected, one end of a single flange opening is fixedly connected to one end of the stainless steel heat exchanger 602, and the other end of the stainless steel heat exchanger 602 is fixedly connected to an internal cooling fan 603, a fan 604 is installed inside the internal cooling fan 603, and a high-temperature pneumatic butterfly valve 601 is fixedly connected between the other end of the internal cooling fan 603 and another flange opening.

[0041] There are two flange openings extending from the back wall of the tempering furnace. When the workpiece needs internal cooling, open the high-temperature pneumatic butterfly valve 601, turn on the internal cooling fan 603, and exchange heat through the stainless steel heat exchanger 602. The hot air in the furnace can be extracted and transported into cold air, so that the furnace temperature can be quickly cooled, the total tempering process time can be greatly reduced, and the efficiency can be improved. Example 4

[0042] like Fig.12 and Fig.13 As shown, the rapid smoke exhaust system 8 includes two jet tubes 801 that are fixedly installed on the top and side of the furnace shell 3. The two jet tubes 801 are both fixedly installed with a high-temperature electric ball valve 802. The other ends of the two jet tubes 801 are commonly fixedly connected with a blower 803, and the ends of the two jet tubes 801 close to the blower 803 are both fixedly installed with a manual ball valve 804.

[0043] When the workpiece is tempered at high temperature after quenching, oil smoke will be generated. Open the high-temperature electric ball valve 802 and turn on the blower 803. The blower 803 can blow air out of the jet pipe 801. The air volume entering the furnace is controlled by the manual ball valve 804. According to the size of the jet, the oil smoke in the furnace is quickly discharged from the exhaust port 7 and then discharged into the smoke hood, thereby ensuring the appearance of the workpiece. When there is no oil smoke in the furnace, close the high-temperature electric ball valve 802 to ensure the sealing effect of the furnace. Example 5

[0044] like Fig.14 As shown, the matching gas system 10 includes a smoke exhaust hood 1001 fixedly installed on the top of the furnace shell 3, one end of the smoke exhaust hood 1001 cooperates with the exhaust gas discharge port 7, and a nitrogen flow controller 1002, an ammonia flow controller 1003 and an air flow controller 1004 are fixedly installed on one side of the outer surface of the furnace shell 3 in sequence.

[0045] In order to prevent the workpiece from oxidation, nitrogen and ammonia cracking gas are used as the protective atmosphere, and the ammonia cracking gas is prepared by the ammonia cracking device 9. The nitrogen flow controller 1002, ammonia flow controller 1003 and air flow controller 1004 can control the speed of nitrogen, ammonia cracking gas and air entering in turn. After the workpiece enters the furnace, the nitrogen is replaced, and then the ammonia cracking gas is introduced for protection. The equipment is equipped with a set of automatic exhaust ignition and flame detection devices, which can automatically ignite the flame and keep the flame burning when the process is carried out to the ammonia cracking gas filling. If the flame goes out during the process, an alarm is given immediately to warn the user and deal with the fault as soon as possible. Prevent safety accidents caused by leakage of ammonia cracking gas.

[0046] Working principle: When in use, the lifting motor 101 can drive the winding shaft to rotate through the sprocket 102 and the chain, and then can drive the furnace door body 105 to rise or fall by lifting, so as to realize the opening and closing of the furnace door body 105. After the workpiece is placed in the furnace, the furnace door body 105 is closed. When the furnace door body 105 is closed, the cylinders 106 on both sides are started. The cylinders 106 running under the limit of the connecting block 108 can drive the special-shaped pressure rods 107 to rotate, so that the pressure blocks 109 on both sides of the furnace door body 105 can be pressed, and then the furnace door body 105 can be pressed tightly against the furnace shell 3, thereby improving the sealing of the entire high-temperature tempering furnace.

[0047] When the workpiece requires an internal cooling process, open the high-temperature pneumatic butterfly valve 601, turn on the internal cooling fan 603, and exchange heat through the stainless steel heat exchanger 602 to extract the hot air in the furnace and transport it into cold air, so that the furnace temperature can be quickly cooled, greatly reducing the total tempering process time and improving efficiency.

[0048] When the workpiece is tempered at high temperature after quenching, oil smoke will be generated. Open the high-temperature electric ball valve 802 and turn on the hair dryer 803. The hair dryer 803 can blow air out from the jet tube 801. The amount of air entering the furnace is controlled by the manual ball valve 804. According to the size of the jet, the oil smoke in the furnace is quickly discharged from the exhaust gas outlet 7 and then discharged into the smoke hood, thereby ensuring the appearance of the workpiece; when there is no oil smoke in the furnace, close the high-temperature electric ball valve 802 to ensure the sealing effect of the furnace.

[0049] In order to prevent the workpiece from oxidation, nitrogen and ammonia cracking gas are used as the protective atmosphere. The ammonia cracking gas is prepared by the ammonia cracking device 9. The nitrogen flow controller 1002, ammonia flow controller 1003 and air flow controller 1004 can control the speed of nitrogen, ammonia cracking gas and air entering in turn. After the workpiece enters the furnace, nitrogen is replaced, and then ammonia cracking gas is introduced for protection. The equipment is equipped with a set of automatic exhaust ignition and flame detection devices, which can automatically ignite the flame when the process is carried out to fill the ammonia cracking gas and keep the flame burning. If the flame goes out during the process, an alarm is given immediately to warn the user and handle the fault as soon as possible. Prevent safety accidents caused by leakage of ammonia cracking gas.

[0050] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention; any figure mark in the claims should not be regarded as limiting the claims involved.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A box-type high-temperature tempering furnace with ammonia cracking gas as protective atmosphere, comprising a furnace shell (3), characterized in that: A furnace door lifting mechanism (1) is installed on one side of the outer surface of the furnace shell (3), a furnace lining (5) is fixedly connected to the interior of the furnace shell (3), an air-cooled stirring motor (4) is fixedly installed through the top of the furnace shell (3), an explosion-proof opening (2) is opened on one side of the top of the furnace shell (3), an inner cooling circulation device (6) is installed on the outer surface of the furnace shell (3) and away from the furnace door lifting mechanism (1), an exhaust gas discharge port (7) is fixedly installed through one side of the outer surface of the furnace shell (3), a rapid smoke exhaust system (8) matched with the exhaust gas discharge port (7) is installed on one side of the outer surface of the furnace shell (3), an ammonia cracking device (9) is installed on one side of the outer surface of the furnace shell (3), and a gas distribution system (10) matched with the ammonia cracking device (9) is installed on the outer surface of the furnace shell (3); The internal cooling circulation device (6) comprises a stainless steel heat exchanger (602) arranged on the outside of the furnace shell (3); one side of the outer surface of the furnace shell (3) is fixedly provided with two flange openings which are in communication with each other; one end of the single flange opening is fixedly connected to one end of the stainless steel heat exchanger (602); the other end of the stainless steel heat exchanger (602) is fixedly connected to an internal cooling fan (603); a fan (604) is installed inside the internal cooling fan (603); and a high-temperature pneumatic butterfly valve (601) is fixedly connected between the other end of the internal cooling fan (603) and the other flange opening; The rapid smoke exhaust system (8) comprises two jet pipes (801) which are fixedly installed on the top and side of the furnace shell (3); the two jet pipes (801) are both fixedly installed with a high-temperature electric ball valve (802); the other ends of the two jet pipes (801) are fixedly connected to a blower (803); and the ends of the two jet pipes (801) close to the blower (803) are both fixedly installed with a manual ball valve (804); The gas distribution system (10) comprises a smoke exhaust hood (1001) fixedly mounted on the top of the furnace shell (3), one end of the smoke exhaust hood (1001) being matched with the exhaust gas discharge port (7), and a nitrogen flow controller (1002), an ammonia flow controller (1003) and an air flow controller (1004) being fixedly mounted in sequence on one side of the outer surface of the furnace shell (3).

2. A box-type ammonia cracking gas protective atmosphere high temperature tempering furnace according to claim 1, characterized in that: The furnace door lifting mechanism (1) comprises two slide rails (104) symmetrically fixedly connected to one side of the outer surface of the furnace shell (3); a furnace door body (105) is slidably connected between the two slide rails (104); a bracket (103) is fixedly installed on the top of the furnace shell (3); a winding shaft is rotatably connected to the top of the bracket (103); a lifting motor (101) is fixedly installed on the top of the bracket (103); a sprocket (102) is fixedly sleeved on the outer surface of the winding shaft and the output shaft of the lifting motor (101); the two sprockets (102) are connected by a chain; and a lifting rope is fixedly connected between the outer surface of the winding shaft and the top of the furnace door body (105).

3. A box-type ammonia cracking gas protective atmosphere high temperature tempering furnace according to claim 2, characterized in that: Two cylinders (106) are symmetrically rotatably connected to both sides of the outer surface of the furnace shell (3); the movable ends of the cylinders (106) are rotatably connected to special-shaped pressure rods (107); the outer surface of the furnace shell (3) is fixedly connected to a connecting block (108) rotatably connected to the special-shaped pressure rod (107); and the outer surface of the furnace door body (105) is fixedly connected to both sides of the outer surface of the furnace door body (105) to pressure blocks (109) matching the special-shaped pressure rods (107).

Images