Continuous nitrate isothermal quenching furnace

Abstract

The continuous nitrate isothermal quenching furnace comprises a furnace body, a sealing groove is formed in one side of the outer wall of the top of the furnace body, a sealing door is connected to the inner wall of the sealing groove in a sliding mode, a rack is fixedly connected to one side of the sealing door, a rotating opening extending into the sealing groove is formed in the outer wall of one side of the furnace body, and the rack is fixedly connected to the other side of the sealing door. A rotatable gear is arranged in the rotating opening, the gear is meshed with the rack, and a rotating mechanism is arranged on the outer wall of one end of the furnace body; the rotating shaft can rotate through rotation of the output shaft of the water-cooling rotating motor, the gear can rotate through rotation of the rotating shaft, force can be applied to the rack through rotation of the gear, the sealing door can move upwards in the inner wall of the sealing groove when the rack is stressed, and the transmission heat resistance of the structure is good; and the connecting blocks can slide in the inner walls of the connecting grooves, so that the roller way can move, and therefore, the effect of prolonging the service life of the equipment can be achieved.

Description

Technical Field

[0001] This utility model specifically relates to the field of quenching furnace technology, and in particular to a continuous nitrate isothermal quenching furnace. Background Technology

[0002] A nitrate isothermal quenching furnace is a device used for metal heat treatment. After the workpiece is heated to a certain temperature, it is quickly placed into a nitrate bath for isothermal quenching. Nitrate, as a quenching medium, has advantages such as fast cooling rate and good temperature uniformity. It enables the workpiece to cool rapidly during the quenching process while maintaining surface hardness, and at the same time reduces internal stress and deformation. A continuous nitrate isothermal quenching furnace is often used.

[0003] In the prior art, a continuous isothermal quenching furnace for nitrate salts generally includes a furnace body, with an electro-hydraulic rod fixedly connected to the top of the furnace body's opening, and a sealing door fixedly connected to the bottom of the piston rod of the electro-hydraulic rod, relying on the sealing door to seal the opening of the furnace body.

[0004] However, the temperature inside the furnace is very high when the above-mentioned device is in use. Even after the heat insulation operation is completed, the temperature near the furnace is still high, and the temperature of the hydraulic oil in the electric hydraulic rod will be high. Long-term use will reduce the service life of the electric hydraulic rod. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a continuous nitrate isothermal quenching furnace.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A continuous isothermal quenching furnace for nitrate salts includes a furnace body. A sealing groove is formed on one side of the top outer wall of the furnace body. A sealing door is slidably connected to the inner wall of the sealing groove. A rack is fixedly connected to one side of the sealing door. A rotating opening extending into the sealing groove is formed on one side of the outer wall of the furnace body. A rotatable gear is installed in the rotating opening, meshing with the rack. A rotating mechanism is provided on one end of the outer wall of the furnace body, and a moving mechanism is provided on the bottom inner wall of the furnace body. In use, the sealing door is separated from the sealing groove, and then a roller conveyor, which cooperates with a connecting block, slides within the inner wall of the connecting groove, allowing the roller conveyor to be pulled out. A mixture containing workpieces and nitrate salts is placed on the roller conveyor. After the salt mixing drum is filled, it is pushed into the furnace body, where the radiant tubes can be used for heating. The water-cooled circulating fan is started, and the fan is driven by a water-cooled motor. The water-cooled circulating fan draws in the airflow passing through the mixing drum and roller conveyor, forcing it through the heating system located between the rear wall of the furnace body and the heat insulation screen before reaching the bottom of the mixing drum. The water-cooled rotary motor is started, and the output shaft of the water-cooled rotary motor rotates, which in turn rotates the gear. The rotation of the gear applies force to the rack, and the force on the rack causes the sealing door to move upward within the inner wall of the sealing groove. The structure has good transmission heat resistance, thus improving the service life of the equipment.

[0008] As a preferred embodiment of this utility model, the rotating mechanism includes a water-cooled rotating motor fixedly connected to the outer wall of one end of the furnace body. The output shaft of the water-cooled rotating motor is fixedly connected to a rotating shaft, and the rotating shaft is fixedly connected to a gear. The rotating shaft is configured to allow rotation operation under the rotation of the output shaft of the water-cooled rotating motor.

[0009] As a preferred technical solution of this utility model, the moving mechanism includes a movable roller conveyor, and a T-shaped connecting groove is provided on the inner wall of the bottom of the furnace body. A T-shaped connecting block is slidably connected to the inner wall of the connecting groove. The connecting block is fixedly connected to the roller conveyor. The connecting block can slide in the inner wall of the connecting groove, which allows the roller conveyor to move.

[0010] As a preferred technical solution of this utility model, a detachable heat insulation screen is provided on one side of the top of the roller conveyor. The heat insulation screen can prevent the heating system from directly radiating heat to the workpiece. The heat insulation screen is located vertically at the end of the roller conveyor and is a certain distance from the rear wall. The heat insulation screen can be removed during maintenance.

[0011] As a preferred technical solution of this utility model, a plurality of evenly distributed threaded grooves are provided on one side of the heat insulation screen and one side of the roller conveyor. A connecting plate is attached to one side of the heat insulation screen, and a connecting port corresponding to each threaded groove is provided on one side of the connecting plate. Bolts are threadedly connected between the inner wall of the threaded groove and the inner wall of the connecting port. The connection plate allows the bolts to be rotated away from the connecting port and the threaded groove with the help of tools, which allows the heat insulation screen to be disassembled during maintenance.

[0012] As a preferred technical solution of this utility model, a radiant tube is fixedly connected to one side of the inner wall of the furnace body. The radiant tube has a serpentine structure. The heat insulation screen is located between the sealing door and the radiant tube. The radiant tube is electrically heated and is made of centrifugally cast heat-resistant steel pipe.

[0013] As a preferred technical solution of this utility model, a water-cooled circulating fan is fixedly connected to the top outer wall of the furnace body. The water-cooled circulating fan is connected to the furnace body. The setting of the water-cooled circulating fan can make the furnace temperature uniform. The use of a powerful fan to circulate air makes the furnace temperature uniform.

[0014] As a preferred embodiment of this utility model, a mixing drum is fixedly connected to the top of the roller conveyor, a rotary motor is fixedly connected to the bottom of the mixing drum, a rotary shaft is fixedly connected to the output shaft of the rotary motor, and a spiral blade is fixedly connected to the surface of the rotary shaft.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. The rotation of the output shaft of the water-cooled rotary motor causes the rotating shaft to rotate, which in turn causes the gear to rotate. The rotation of the gear applies force to the rack, which in turn causes the sealing door to move upward within the inner wall of the sealing groove. The structure has good transmission heat resistance, thus improving the service life of the equipment.

[0017] 2. The connecting block can slide within the inner wall of the connecting groove, allowing the roller conveyor to move. The heat insulation screen prevents the heating system from directly radiating heat to the workpiece. The heat insulation screen is vertically located at the end of the roller conveyor and is a certain distance from the rear wall. The heat insulation screen can be disassembled during maintenance.

[0018] 3. By starting the rotary motor, the rotating shaft can be rotated, which in turn causes the spiral blades to rotate. The rotation of the spiral blades ensures that the workpiece and nitrate salt in the mixing tank are fully mixed, which can ensure that the temperature of the mixing tank is consistent with the surrounding air temperature, thus keeping the mixing tank at a constant temperature and ensuring that the workpiece inside the mixing tank is at a constant temperature, which helps to improve the production quality of the quenching operation. Attached Figure Description

[0019] Figure 1This is a three-dimensional structural diagram of a continuous isothermal quenching furnace for nitrates proposed in this utility model.

[0020] Figure 2 This is a partial cross-sectional structural schematic diagram of a continuous nitrate isothermal quenching furnace proposed in this utility model.

[0021] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0022] Figure 4 This is a schematic diagram of the spiral blade structure of a continuous isothermal quenching furnace for nitrates proposed in this utility model.

[0023] In the diagram: 1. Furnace body; 2. Sealing groove; 3. Sealing door; 4. Rack; 5. Rotating port; 6. Gear; 7. Water-cooled rotary motor; 8. Rotating shaft; 9. Connecting groove; 10. Connecting block; 11. Roller conveyor; 12. Heat insulation screen; 13. Connecting plate; 14. Connecting port; 15. Radiant tube; 16. Water-cooled circulating fan; 17. Mixing tank; 18. Rotary motor; 19. Rotating shaft; 20. Spiral blade. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. It should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection", and "setting" should be interpreted broadly. For those skilled in the art, the specific meaning of the above terms in this patent can be understood according to the specific circumstances.

[0025] Reference Figure 1-4 A continuous isothermal quenching furnace for nitrate salts includes a furnace body 1. A sealing groove 2 is provided on one side of the top outer wall of the furnace body 1. A sealing door 3 is slidably connected to the inner wall of the sealing groove 2. A rack 4 is fixedly connected to one side of the sealing door 3. A rotating opening 5 extending into the sealing groove 2 is provided on one side outer wall of the furnace body 1. A rotatable gear 6 is provided in the rotating opening 5. The gear 6 meshes with the rack 4. A rotating mechanism is provided on one end outer wall of the furnace body 1. A moving mechanism is provided on the bottom inner wall of the furnace body 1.

[0026] The rotating mechanism includes a water-cooled rotary motor 7 that is fixedly connected to the outer wall of one end of the furnace body 1. The output shaft of the water-cooled rotary motor 7 is fixedly connected to a rotating shaft 8. The rotating shaft 8 is fixedly connected to a gear 6. The rotating mechanism can be rotated by rotating the output shaft of the water-cooled rotary motor 7.

[0027] The moving mechanism includes a movable roller conveyor 11. A T-shaped connecting groove 9 is provided on the bottom inner wall of the furnace body 1. A T-shaped connecting block 10 is slidably connected to the inner wall of the connecting groove 9. The connecting block 10 is fixedly connected to the roller conveyor 11. The roller conveyor 11 can move by sliding in the inner wall of the connecting groove 9 through the connecting block 10.

[0028] A removable heat shield 12 is provided on one side of the top of the roller conveyor 11. The heat shield 12 can prevent the heating system from directly radiating heat to the workpiece. The heat shield 12 is located vertically at the end of the roller conveyor 11 and is a certain distance from the rear wall. The heat shield 12 can be removed during maintenance.

[0029] The heat insulation screen 12 and the roller conveyor 11 are provided with several evenly distributed threaded grooves on one side. A connecting plate 13 is attached to one side of the heat insulation screen 12. A connecting port 14 corresponding to the threaded groove is provided on one side of the connecting plate 13. A bolt is threadedly connected between the inner wall of the threaded groove and the inner wall of the connecting port 14. The bolt can be rotated away from the connecting port 14 and the threaded groove by means of a tool through the connecting plate 13, so that the heat insulation screen 12 can be disassembled during maintenance.

[0030] A radiant tube 15 is fixedly connected to the inner wall of one side of the furnace body 1. The radiant tube 15 has a serpentine structure. The heat insulation screen 12 is located between the sealing door 3 and the radiant tube 15. The radiant tube 15 is electrically heated and is made of centrifugally cast heat-resistant steel pipe.

[0031] A water-cooled circulating fan 16 is fixedly connected to the top outer wall of the furnace body 1. The water-cooled circulating fan 16 is connected to the inside of the furnace body 1. The water-cooled circulating fan 16 can make the furnace temperature uniform. The powerful fan is used to circulate air to make the furnace temperature uniform.

[0032] A mixing tank 17 is fixedly connected to the top of the roller conveyor 11, and a rotary motor 18 is fixedly connected to the bottom of the mixing tank 17. A rotating shaft 19 is fixedly connected to the output shaft of the rotary motor 18, and a spiral blade 20 is fixedly connected to the surface of the rotating shaft 19. By starting the rotary motor 18, the rotating shaft 19 can be rotated, and the rotation of the rotating shaft 19 can cause the spiral blade 20 to rotate. The rotation of the spiral blade 20 can ensure that the workpiece and nitrate salt in the mixing tank 17 are fully mixed, which can ensure that the temperature of the mixing tank is consistent with that of the surrounding air, thus keeping the mixing tank 17 at a constant temperature. This, in turn, ensures that the workpiece in the mixing tank 17 is at a constant temperature, which helps to improve the production quality of the quenching operation.

[0033] The working principle of this embodiment is as follows: During use, the sealing door 3 is separated from the sealing groove 2. Then, the roller conveyor 11 is pulled out, sliding within the inner wall of the connecting groove 9 in conjunction with the connecting block 10. After placing the mixing drum 17 containing the workpiece and nitrate on the roller conveyor 11, it is pushed into the furnace body 1. The radiant tube 15 can then perform heating. The water-cooled circulating fan 16 is started. The fan of the water-cooled circulating fan 16 is driven by a water-cooled motor. The water-cooled circulating fan 16 draws in the airflow passing through the mixing drum 17 and the roller conveyor 11, forcing it to pass through the space between the rear wall of the furnace body 1 and the partition wall. The heating system between the heat shields 12 then reaches the bottom of the mixing tank 17. The water-cooled rotary motor 7 is started. The output shaft of the water-cooled rotary motor 7 rotates, which causes the rotating shaft 8 to rotate. The rotation of the rotating shaft 8 causes the gear 6 to rotate. The rotation of the gear 6 applies force to the rack 4. The force on the rack 4 causes the sealing door 3 to move upward within the inner wall of the sealing groove 2. The structure has good transmission heat resistance. Combined with the rotation of the spiral blade 20, it can ensure that the workpiece and nitrate salt in the mixing tank 17 are fully mixed, which helps to improve the production quality of the quenching operation. Therefore, it can improve the service life of the equipment.

[0034] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A continuous nitrate isothermal quenching furnace comprising a furnace body (1), characterized in that, The outer wall of the top of the furnace body (1) is provided with a sealing groove (2), the inner wall of the sealing groove (2) is slidably connected with a sealing door (3), one side of the sealing door (3) is fixedly connected with a rack (4), the outer wall of one side of the furnace body (1) is provided with a rotating opening (5) extending into the sealing groove (2), the rotating opening (5) is provided with a rotatable gear (6), the gear (6) is engaged with the rack (4), one end of the outer wall of the furnace body (1) is provided with a rotating mechanism, and the bottom inner wall of the furnace body (1) is provided with a moving mechanism.

2. A continuous nitrate isothermal quenching furnace according to claim 1, characterized in that: The rotating mechanism comprises a water-cooled rotating motor (7) fixedly connected with one end of the outer wall of the furnace body (1), and the output shaft of the water-cooled rotating motor (7) is fixedly connected with a rotating shaft (8), and the rotating shaft (8) is fixedly connected between the gear (6).

3. A continuous nitriding and carburizing isothermal hardening furnace according to claim 1, characterized in that: The moving mechanism comprises a movable roller (11), the bottom inner wall of the furnace body (1) is provided with a T-shaped connecting groove (9), the inner wall of the connecting groove (9) is slidably connected with a T-shaped connecting block (10), and the connecting block (10) is fixedly connected with the roller (11).

4. A continuous nitrate isothermal quenching furnace according to claim 3, characterized in that: The top side of the roller (11) is provided with a detachable heat shield (12).

5. A continuous nitrate isothermal quenching furnace as claimed in claim 4, characterized in that: The side of the heat shield (12) and the side of the roller (11) are both provided with a plurality of uniformly distributed threaded grooves, the side of the heat shield (12) is overlapped with a connecting plate (13), the side of the connecting plate (13) is provided with a connecting port (14) corresponding to the threaded groove, and the inner wall of the threaded groove and the inner wall of the connecting port (14) are connected by a threaded bolt.

6. A continuous nitrate isothermal quenching furnace as claimed in claim 5, characterized in that: The inner wall of one side of the furnace body (1) is fixedly connected with a radiation pipe (15), the radiation pipe (15) is in a serpentine structure, and the heat shield (12) is located between the sealing door (3) and the radiation pipe (15).

7. A continuous nitrate isothermal quenching furnace as claimed in claim 6, characterized in that: The outer wall of the top of the furnace body (1) is fixedly connected with a water-cooled circulating fan (16), and the water-cooled circulating fan (16) is connected with the furnace body (1).

8. A continuous nitrate isothermal quenching furnace as claimed in claim 6, characterized in that: The top of the roller (11) is fixedly connected with a mixing barrel (17), the bottom of the mixing barrel (17) is fixedly connected with a rotating motor (18), the output shaft of the rotating motor (18) is fixedly connected with a rotating shaft (19), and the surface of the rotating shaft (19) is fixedly connected with a spiral blade (20).

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