A tempering furnace for eliminating residual internal stress of castings

Abstract

The present invention discloses a tempering furnace for eliminating residual internal stress of castings, comprising a furnace body and a feed box arranged on the left side of the furnace body, wherein the inner cavity of the furnace body is fixedly connected to a spiral conveying track, and the present invention relates to the technical field of tempering furnaces. The tempering furnace for eliminating residual internal stress of castings gradually decreases the temperature from bottom to top, and a push plate rotates in the spiral conveying track to adjust the position of the push plate, thereby adjusting the conveying of steel balls, and sequentially performing tempering at different temperatures. The temperature increases from top to bottom, so that the temperature of the steel balls gradually increases during the tempering process, thereby avoiding irregular expansion caused by excessive heating, and solving the problem that the surface temperature of the steel balls is low while the tempering temperature is relatively high, so that the steel balls are suddenly heated during tempering, which may cause the steel balls to expand irregularly due to excessive thermal expansion, and ultimately result in a high defective rate of the produced steel balls.

Description

Technical Field

[0001] The invention relates to the technical field of tempering furnaces, in particular to a tempering furnace used for eliminating residual internal stress of castings. Background Art

[0002] During the tempering process of steel shots, the steel shots are generally poured directly into the furnace body, and the carbon bricks are heated by gas, thereby tempering the steel shots on the carbon bricks. However, since the steel shots are quenched before tempering, the surface temperature of the steel shots is relatively low, and the tempering temperature is relatively high, so the steel shots will be suddenly heated during tempering, which may cause the steel shots to expand irregularly due to excessive thermal expansion, ultimately resulting in a high rate of defective steel shots. In addition, the workpiece quenched by the oil medium has a large amount of quenching oil adhered to its surface. During the subsequent tempering, the heating temperature in the tempering furnace is not enough to reach the combustion temperature of the quenching oil. Therefore, when the workpiece enters the furnace for heating, the quenching oil adhered to the surface is quickly vaporized by the heat, generating a large amount of smoke, which pollutes the atmospheric environment and endangers the health of workers. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a tempering furnace for eliminating residual internal stress in castings, which solves the above-mentioned problems.

[0004] To achieve the above purpose, the present invention is implemented through the following technical solutions: a tempering furnace for eliminating residual internal stress of castings, comprising a furnace body and a feed box arranged on the left side of the furnace body, the inner cavity of the furnace body is fixedly connected to a spiral conveying track, the bottom of the furnace body is fixedly connected to a heating device located in the inner cavity of the spiral conveying track, the top of the furnace body is connected to a separation box, the inner cavity of the separation box is fixedly connected to an oil mist filter, the bottom of the inner cavity of the separation box is located on both sides of the oil mist filter, and is respectively connected to an oil drain pipe and a hot gas recovery pipe, the hot gas recovery pipe is connected to a built-in fan of the heating device, and the inner cavity of the furnace body is fixedly connected to the inner cavity of the separation box. A combustion device is fixedly connected to the furnace body, a pumping box is fixedly connected to the surface of the furnace body, a driving cylinder is fixedly connected to the top of the pumping box, the bottom end of the driving cylinder piston rod passes through and extends to the inner cavity of the pumping box, the inner cavity of the pumping box is slidably connected to a piston plate fixedly connected to the bottom end of the driving cylinder piston rod, the top of the piston plate is connected to a telescopic hose, the top of the telescopic hose is connected to the bottom end of the oil drain pipe, the surface of the oil drain pipe is respectively provided with a first solenoid valve and a second solenoid valve, the inner cavity of the pumping box is connected to the combustion chamber of the combustion device through a connecting pipe, and a one-way valve is provided on the surface of the connecting pipe.

[0005] As a further solution of the present invention: the oil mist filter is designed to be inclined, and the bottom of the inner cavity of the separation box is provided with a downward slope facing the oil discharge pipe.

[0006] As a further solution of the present invention: the spiral conveying track is a spiral ring track that is larger at the top and smaller at the bottom, and is wound around the surface of the heating device.

[0007] As a further solution of the present invention: the inner cavity of the furnace body is rotatably connected to a rotating shaft driven by a driving motor, and the surface of the rotating shaft is fixedly connected to a push plate, which passes through and extends to the inner cavity of the spiral conveying track, and multiple rotating shafts are arranged above the spiral conveying track.

[0008] As a further solution of the present invention: a discharge box is provided on one side of the furnace body, the inner cavity of the discharge box is connected with the inner cavity of the furnace body through a first electric sealing door, and the bottom of the discharge box is connected with a discharge pipe.

[0009] As a further solution of the present invention: the inner cavity of the feed box is connected to the inner cavity of the furnace body through a second electric sealing door, and the inner cavity of the feed box is rotatably connected to a toggle plate, the toggle plate is located on one side of the second electric sealing door, and the surface of the toggle plate is fixedly connected to a sealing elastic pad, and one side of the sealing elastic pad is fixedly connected to the bottom of the inner cavity of the feed box.

[0010] As a further solution of the present invention: a discharge slope is provided at the bottom of the discharge box.

[0011] As a further solution of the present invention: a sealing groove adapted to the surface of the shifting plate is provided at the bottom of the inner cavity of the feed box.

[0012] When in use, steel balls are added through the feed box, and then the steel balls fall above the toggle plate. Then the second electric sealing door is opened at this time. At this time, the toggle plate is driven by the motor to rotate up and down in the sealing groove of the feed box, and the sealing elastic pad moves up and down to push the steel balls in the feed box into the second electric sealing door and fall into the spiral conveying track in the furnace body. At this time, the heating device is heated, and the temperature gradually decreases from bottom to top. At this time, the motor drives the rotating shaft to rotate, driving the push plate to rotate in the spiral conveying track to adjust the position of the push plate and adjust the delivery of the steel balls. When the push plate is inside the spiral conveying track, the steel balls are fed into the furnace. The limit is set, and when the push plate rotates, it pushes the steel ball to move. When it is transported downward from the spiral conveyor track, it is tempered at different temperatures in sequence, which solves the problem that the surface temperature of the steel shot is low, while the tempering temperature is relatively high, so the steel shot will be heated suddenly during tempering, which may cause the steel shot to expand irregularly due to excessive heat expansion, and ultimately make the produced steel shot defective rate too high. The temperature rises from top to bottom, so that the temperature of the steel shot gradually rises during the tempering process, thereby avoiding the irregular expansion caused by excessive heating. Then the oil mist on the surface of the steel ball is heated and volatilized, and the oil mist is heated and volatilized through the built-in heating device. The fan pumps the oil into the separation box, and then passes through the oil mist filter. The hot air is transported back to the heating device from the hot gas recovery pipe for reuse. At this time, the oil mist is blocked by the oil mist filter and falls into the oil discharge pipe from the downslope of the separation box. Then the first solenoid valve is opened, and the oil falls between the first and second solenoid valves. Then the first solenoid valve is closed and the second solenoid valve is opened, and the oil falls into the telescopic hose again, and then falls into the pumping box. The driving cylinder in the pumping box is activated to drive the piston plate up and down, forming a positive pressure in the pumping box to spray the oil from the connecting pipe into the combustion chamber of the combustion equipment, and in the furnace body. Combustion is carried out to heat the furnace body. A large amount of quenching oil adheres to the surface of the steel balls that have been quenched by the oil medium. During the subsequent tempering, the heating temperature in the tempering furnace is not enough to reach the combustion temperature of the quenching oil. Therefore, when the workpiece enters the furnace for heating, the quenching oil adhered to the surface is quickly vaporized by the heat, generating a large amount of smoke, which pollutes the atmospheric environment and endangers the health of workers. At this time, positive pressure is formed in the pumping box to spray the oil from the connecting pipe into the combustion chamber of the combustion equipment, and the oil is burned in the furnace body to heat the furnace body. It can be effectively recycled and reused, and has a simple structure, easy operation, and is more environmentally friendly and energy-saving.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention adjusts the position of the push plate by gradually decreasing the temperature from bottom to top, and adjusting the position of the push plate by rotating in the spiral conveying track to adjust the conveying of the steel balls. Tempering at different temperatures is performed in sequence, and the temperature is increased from top to bottom, so that the temperature of the steel balls gradually increases during the tempering process, thereby avoiding irregular expansion caused by excessive heating. It solves the problem that the surface temperature of the steel balls is low and the tempering temperature is relatively high, so that the steel balls are suddenly heated during tempering, which may cause the steel balls to expand irregularly due to excessive thermal expansion, and ultimately the problem that the defective rate of the produced steel balls is too high.

[0015] 2. The present invention heats the furnace body by burning in the furnace body. After the steel balls are quenched by the oil medium, a large amount of quenching oil adheres to their surfaces. When tempering is subsequently performed, the heating temperature in the tempering furnace is not enough to reach the combustion temperature of the quenching oil. Therefore, when the workpiece enters the furnace for heating, the quenching oil adhered to the surface is quickly vaporized by the heat, generating a large amount of smoke, which pollutes the atmospheric environment and endangers the health of workers. At this time, the positive pressure is formed in the pumping box to spray the oil from the connecting pipe into the combustion chamber of the combustion equipment, and the furnace body is burned in the furnace body to heat it. It can be effectively recycled and reused, and has a simple structure, convenient operation, and is more environmentally friendly and energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 It is a cross-sectional view of the structure of the present invention;

[0018] Figure 3 For the present invention Figure 2 A partial enlarged view of point A in the middle;

[0019] Figure 4 For the present invention Figure 2 A partial enlarged view of point B in the middle;

[0020] Figure 5 For the present invention Figure 1 A partial enlarged view of point C in the middle.

[0021] In the figure: 1. furnace body; 2. feed box; 3. heating device; 4. spiral conveyor track; 5. separation box; 6. oil discharge pipe; 7. hot gas recovery pipe; 8. oil mist filter; 9. rotating shaft; 10. push plate; 11. discharge box; 12. first solenoid valve; 13. second solenoid valve; 14. telescopic hose; 15. pumping box; 16. driving cylinder; 17. piston plate; 18. connecting pipe; 19. discharge slope; 20. sealing groove; 21. toggle plate; 22. sealing elastic pad; 23. second electric sealing door; 24. first electric sealing door. DETAILED DESCRIPTION

[0022] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0023] See also Figure 1-5The present invention provides a technical solution: a tempering furnace for eliminating residual internal stress of castings, comprising a furnace body 1 and a feed box 2 arranged on the left side of the furnace body 1, the inner cavity of the furnace body 1 is fixedly connected to a spiral conveying track 4, the bottom of the furnace body 1 is fixedly connected to a heating device 3 located in the inner cavity of the spiral conveying track 4, the top of the furnace body 1 is connected to a separation box 5, the inner cavity of the separation box 5 is fixedly connected to an oil mist filter 8, the bottom of the inner cavity of the separation box 5 is located on both sides of the oil mist filter 8 and is respectively connected to an oil discharge pipe 6 and a hot gas recovery pipe 7, the hot gas recovery pipe 7 is connected to the built-in fan of the heating device 3, the inner cavity of the furnace body 1 is fixedly connected to a combustion device, the surface of the furnace body 1 is fixedly connected to a pumping box 15, and the top of the pumping box 15 is fixedly connected to a driving cylinder 16, The bottom end of the piston rod of the driving cylinder 16 passes through and extends to the inner cavity of the pumping box 15. The inner cavity of the pumping box 15 is slidably connected to a piston plate 17 fixedly connected to the bottom end of the piston rod of the driving cylinder 16. The top of the piston plate 17 is connected to a telescopic hose 14. The top of the telescopic hose 14 is connected to the bottom end of the oil discharge pipe 6. The surface of the oil discharge pipe 6 is respectively provided with a first solenoid valve 12 and a second solenoid valve 13. The inner cavity of the pumping box 15 is connected to the combustion chamber of the combustion equipment through a connecting pipe 18, and a one-way valve is provided on the surface of the connecting pipe 18. When in use, steel balls are added through the feed box 2, and then the steel balls fall above the toggle plate 21. Then the second electric sealing door 23 is opened at this time. At this time, the toggle plate 21 is driven by the motor to seal the feed box 2. The sealing groove 20 rotates up and down, and the sealing elastic pad 22 moves up and down to push the steel balls in the feed box 2 into the second electric sealing door 23 and fall into the spiral conveying track 4 in the furnace body 1. At this time, the heating device 3 is heated, and the temperature gradually decreases from bottom to top. At this time, the motor drives the rotating shaft 9 to rotate, driving the push plate 10 to rotate in the spiral conveying track 4 to adjust the position of the push plate 10 and adjust the conveying of the steel balls. When the push plate 10 is located inside the spiral conveying track 4, the steel balls are limited. When the push plate 10 rotates, it pushes the steel balls to move. When they are conveyed downward from the spiral conveying track 4, they are tempered at different temperatures in turn, which solves the problem that the surface temperature of the steel balls is low, while the tempering temperature is relatively high, so that the steel balls will suddenly burst during tempering. When heated, the steel shot may expand irregularly due to excessive heat expansion, which ultimately leads to a high defective rate of the produced steel shot. The temperature increases from top to bottom, so that the temperature of the steel shot gradually increases during the tempering process, thereby avoiding the irregular expansion caused by excessive heating. Then the oil mist on the surface of the steel ball evaporates due to heat, and is pumped into the separation box 5 by the built-in fan of the heating device 3. Then, it is filtered by the oil mist filter 8, and the hot air is transported back to the heating device 3 from the hot gas recovery pipe 7 for reuse. At this time, the oil mist is blocked by the oil mist filter 8 and falls into the oil discharge pipe 6 from the downslope surface in the separation box 5. Then the first solenoid valve 12 is opened, and the oil falls between the first solenoid valve 12 and the second solenoid valve 13.Then the first solenoid valve 12 is closed and the second solenoid valve 13 is opened, and the oil falls into the telescopic hose 14 again, and then falls into the pumping box 15. The driving cylinder 16 in the pumping box 15 is activated to drive the piston plate 17 to move up and down, forming a positive pressure in the pumping box 15 to spray the oil from the connecting pipe 18 into the combustion chamber of the combustion equipment, and burn in the furnace body 1 to heat the furnace body 1. The steel balls quenched by the oil medium have a large amount of quenching oil adhered to their surfaces. During the subsequent tempering, because the heating temperature in the tempering furnace is not enough to reach the combustion temperature of the quenching oil, when the workpiece enters the furnace chamber for heating, the quenching oil adhered to the surface is quickly vaporized by the heat, generating a large amount of smoke, which pollutes the atmospheric environment and endangers the health of workers. At this time, the positive pressure is formed in the pumping box 15 to spray the oil from the connecting pipe 18 into the combustion chamber of the combustion equipment, and burn in the furnace body 1 to heat the furnace body 1. It can be effectively recycled, and has a simple structure, easy operation, and is more environmentally friendly and energy-saving.

[0024] The oil mist filter 8 is designed to be inclined, and the bottom of the inner cavity of the separation box 5 is provided with a downward slope facing the oil discharge pipe 6 .

[0025] The spiral conveying track 4 is a spiral annular track that is larger at the top and smaller at the bottom, and is wound around the surface of the heating device 3 .

[0026] The inner cavity of the furnace body 1 is rotatably connected to a rotating shaft 9 driven by a driving motor, and a push plate 10 is fixedly connected to the surface of the rotating shaft 9. The push plate 10 passes through and extends to the inner cavity of the spiral conveying track 4. There are multiple rotating shafts 9 above the spiral conveying track 4. The rotating shaft 9 is driven by the motor to rotate, driving the push plate 10 to rotate in the spiral conveying track 4 to adjust the position of the push plate 10 and adjust the delivery of the steel balls. When the push plate 10 is located inside the spiral conveying track 4, the steel balls are limited. When the push plate 10 rotates, it pushes the steel balls to move and transport them downward from the spiral conveying track 4.

[0027] A discharge box 11 is provided on one side of the furnace body 1 , the inner cavity of the discharge box 11 is communicated with the inner cavity of the furnace body 1 through a first electric sealing door 24 , and the bottom of the discharge box 11 is connected to a discharge pipe.

[0028] The inner cavity of the feed box 2 is connected to the inner cavity of the furnace body 1 through the second electric sealing door 23, and the inner cavity of the feed box 2 is rotatably connected to a toggle plate 21, and the toggle plate 21 is located on one side of the second electric sealing door 23. The surface of the toggle plate 21 is fixedly connected to a sealing elastic pad 22, and one side of the sealing elastic pad 22 is fixedly connected to the bottom of the inner cavity of the feed box 2. Steel balls are added through the feed box 2, and then the steel balls fall above the toggle plate 21. Then the second electric sealing door 23 is opened at this time. At this time, the toggle plate 21 is driven by the motor to rotate up and down in the sealing groove 20 of the feed box 2, and the sealing elastic pad 22 moves up and down to push the steel balls in the feed box 2 into the second electric sealing door 23.

[0029] A discharge slope 19 is provided at the bottom of the discharge box 11 .

[0030] A sealing groove 20 adapted to the surface of the shift plate 21 is provided at the bottom of the inner cavity of the feed box 2 .

[0031] During use, steel balls are added through the feed box 2, and then the steel balls fall above the toggle plate 21. Then, the second electric sealing door 23 is opened. At this time, the toggle plate 21 is driven by the motor to rotate up and down in the sealing groove 20 of the feed box 2. The sealing elastic pad 22 moves up and down, pushing the steel balls in the feed box 2 into the second electric sealing door 23 and falling into the spiral conveying track 4 in the furnace body 1. At this time, the heating device 3 is heated, and the temperature gradually decreases from bottom to top. At this time, the rotating shaft 9 is driven by the motor to rotate, driving the push plate 10 to rotate in the spiral conveying track 4 to adjust the position of the push plate 10 and adjust the delivery of the steel balls. The push plate 10 is located on the spiral conveying track 4, the steel balls are limited, and when the push plate 10 rotates, the steel balls are pushed to move. When they are transported downward from the spiral conveying track 4, they are tempered at different temperatures in sequence, which solves the problem that the surface temperature of the steel balls is low and the tempering temperature is relatively high, so that the steel balls are suddenly heated during tempering, which may cause irregular expansion of the steel balls due to excessive heat expansion, and ultimately cause the problem that the defective rate of the produced steel balls is too high. The temperature rises from top to bottom, so that the temperature of the steel balls gradually rises during the tempering process, thereby avoiding irregular expansion caused by excessive heating. Then the oil mist on the surface of the steel balls is volatilized by heat, and the exhaust of the built-in fan of the heating device 3 is exhausted. The oil is sent to the separation box 5, and then filtered by the oil mist filter 8. The hot gas is sent back to the heating device 3 from the hot gas recovery pipe 7 for reuse. At this time, the oil mist is blocked by the oil mist filter 8 and falls into the oil discharge pipe 6 from the downslope of the separation box 5. Then the first solenoid valve 12 is opened, and the oil falls between the first solenoid valve 12 and the second solenoid valve 13. Then the first solenoid valve 12 is closed and the second solenoid valve 13 is opened and falls into the telescopic hose 14 again, and then falls into the pumping box 15. The driving cylinder 16 in the pumping box 15 is started to drive the piston plate 17 up and down, forming a positive pressure in the pumping box 15 to spray the oil from the connecting pipe 18 to the combustion equipment. In the combustion chamber, combustion is carried out in the furnace body 1 to heat the furnace body 1. The steel balls quenched by the oil medium have a large amount of quenching oil adhered to their surfaces. During the subsequent tempering, the heating temperature in the tempering furnace is not enough to reach the combustion temperature of the quenching oil. Therefore, when the workpiece enters the furnace for heating, the quenching oil adhered to the surface is quickly vaporized by the heat, generating a large amount of smoke, which pollutes the atmospheric environment and endangers the health of workers. At this time, a positive pressure is formed in the pumping box 15 to spray the oil from the connecting pipe 18 into the combustion chamber of the combustion equipment, and burns in the furnace body 1 to heat the furnace body 1, which can be effectively recycled and reused, and has a simple structure, easy operation, and is more environmentally friendly and energy-saving.

[0032] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A tempering furnace for eliminating residual internal stress of castings, comprising a furnace body (1) and a feed box (2) arranged on the left side of the furnace body (1), characterized in that: The inner cavity of the furnace body (1) is fixedly connected to a spiral conveying track (4), the bottom of the furnace body (1) is fixedly connected to a heating device (3) located in the inner cavity of the spiral conveying track (4), the top of the furnace body (1) is connected to a separation box (5), the inner cavity of the separation box (5) is fixedly connected to an oil mist filter (8), the bottom of the inner cavity of the separation box (5) is located on both sides of the oil mist filter (8) and is respectively connected to an oil drain pipe (6) and a hot gas recovery pipe (7), the hot gas recovery pipe (7) is connected to the built-in fan of the heating device (3), the inner cavity of the furnace body (1) is fixedly connected to a combustion device, the surface of the furnace body (1) is fixedly connected to a pumping box (15), the pumping box (15) A driving cylinder (16) is fixedly connected to the top, and the bottom end of the piston rod of the driving cylinder (16) passes through and extends to the inner cavity of the pumping box (15). The inner cavity of the pumping box (15) is slidably connected to a piston plate (17) fixedly connected to the bottom end of the piston rod of the driving cylinder (16). The top of the piston plate (17) is connected to a telescopic hose (14), and the top end of the telescopic hose (14) is connected to the bottom end of the oil discharge pipe (6). The surface of the oil discharge pipe (6) is respectively provided with a first solenoid valve (12) and a second solenoid valve (13). The inner cavity of the pumping box (15) is connected to the combustion chamber of the combustion equipment through a connecting pipe (18), and a one-way valve is provided on the surface of the connecting pipe (18); The spiral conveying track (4) is a spiral annular track that is larger at the top and smaller at the bottom, and is wound around the surface of the heating device (3); The inner cavity of the furnace body (1) is rotatably connected to a rotating shaft (9) driven by a driving motor, and a push plate (10) is fixedly connected to the surface of the rotating shaft (9). The push plate (10) passes through and extends to the inner cavity of the spiral conveying track (4). A plurality of rotating shafts (9) are provided above the spiral conveying track (4).

2. A tempering furnace for eliminating residual internal stress of castings according to claim 1, characterized in that: The oil mist filter (8) is designed to be inclined, and the bottom of the inner cavity of the separation box (5) is provided with a downward slope facing the oil discharge pipe (6).

3. The tempering furnace for eliminating residual internal stress of castings according to claim 1, characterized in that: A discharge box (11) is provided on one side of the furnace body (1); the inner cavity of the discharge box (11) is connected to the inner cavity of the furnace body (1) through a first electric sealing door (24); and the bottom of the discharge box (11) is connected to a discharge pipe.

4. The tempering furnace for eliminating residual internal stress of castings according to claim 1, characterized in that: The inner cavity of the feed box (2) is connected to the inner cavity of the furnace body (1) through the second electric sealing door (23), and the inner cavity of the feed box (2) is rotatably connected to a toggle plate (21), the toggle plate (21) is located on one side of the second electric sealing door (23), and a sealing elastic pad (22) is fixedly connected to the surface of the toggle plate (21), and one side of the sealing elastic pad (22) is fixedly connected to the bottom of the inner cavity of the feed box (2).

5. The tempering furnace for eliminating residual internal stress of castings according to claim 3, characterized in that: The bottom of the discharge box (11) is provided with a discharge slope (19).

6. The tempering furnace for eliminating residual internal stress of castings according to claim 1, characterized in that: A sealing groove (20) adapted to the surface of the shifting plate (21) is provided at the bottom of the inner cavity of the feed box (2).

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