Isothermal salt bath for producing an austempered ductile iron material

Abstract

The application relates to the technical field of isothermal quenching nodular cast iron, in particular to an isothermal salt bath for producing isothermal quenching nodular cast iron material, which comprises a salt bath body, an annular liquid inlet pipe assembly, an annular liquid return pipe assembly, a stirring mechanism, a water pump, a heater and a cooling box; the stirring mechanism is arranged on the salt bath body; the annular liquid inlet pipe assembly and the annular liquid return pipe assembly are arranged in the salt bath body, and the annular liquid inlet pipe assembly is located above the annular liquid return pipe assembly; the cooling box is provided with a cooling box water outlet pipe and a cooling box water inlet pipe, the cooling box water outlet pipe is communicated with the annular liquid return pipe assembly, and the cooling box water inlet pipe is communicated with the annular liquid inlet pipe assembly; the water pump is arranged on the cooling box water outlet pipe; and the heater is arranged at the bottom of the salt bath body. The application has the advantages that when quenching, the nitrate salt solution is subjected to circulating cooling and temperature reduction through the water inlet pipe and the water outlet pipe, and the nitrate salt solution is stirred by the stirring rod, so that the overall temperature is more uniform.

Description

Technical Field

[0001] This application relates to the technical field of isothermal quenching ductile iron, and in particular to an isothermal salt bath for the production of isothermal quenching ductile iron materials. Background Technology

[0002] Isothermal hardened ductile iron, abbreviated as ADI, is cast ductile iron of a certain composition that has undergone isothermal hardening heat treatment. The resulting microstructure consists of high-carbon austenite and acicular ferrite, giving it comprehensive properties close to those of steel. Its excellent performance is further enhanced by the fact that ductile iron has a carbon equivalent close to its eutectic point, resulting in better fluidity and casting properties than steel. After heat treatment, ADI exhibits significantly improved strength, plasticity, and toughness at room temperature, while also possessing excellent wear resistance, vibration damping, and abrasion resistance. Isothermal hardening requires the use of an isothermal salt bath to treat the ductile iron.

[0003] The structure of the isothermal salt bath for isothermal quenching of ductile iron in related technologies includes a base plate and a salt bath installed on the base plate. An opening is provided at the top of the salt bath for placing the quenched part. After the ductile iron is placed in the salt bath, the temperature of the salt bath rises rapidly, so it is necessary to adjust the temperature of the salt bath. Summary of the Invention

[0004] Purpose of the invention

[0005] The present invention aims to address the shortcomings of the prior art. In order to facilitate the cooling of the solution in the salt bath, this application provides an isothermal salt bath for the production of isothermal quenching ductile iron materials.

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

[0007] An isothermal salt bath for the production of isothermal quenched ductile iron materials includes a salt bath body, an annular inlet pipe assembly, an annular return pipe assembly, a stirring mechanism, a water pump, a heater, and a cooling tank.

[0008] The stirring mechanism is installed on the salt tank body and is used to stir the solution inside the salt tank body;

[0009] The annular inlet pipe assembly and the annular return pipe assembly are disposed within the brine tank body, with the annular inlet pipe assembly located above the annular return pipe assembly.

[0010] The cooling tank is located outside the salt pool body. The cooling tank is equipped with a cooling tank outlet pipe and a cooling tank inlet pipe. The cooling tank outlet pipe is connected to the annular return pipe assembly, and the cooling tank inlet pipe is connected to the annular inlet pipe assembly.

[0011] The water pump is installed on the outlet pipe of the cooling tank; the heater is installed at the bottom of the salt pool body.

[0012] As a further description of the above solution, the annular return pipe assembly includes an annular return pipe and a first connector. The annular return pipe is connected to the cooling tank outlet pipe. The annular return pipe is disposed in the upper part of the salt tank body through the first connector and is located above the solution in the salt tank body. The inner sidewall of the annular return pipe is provided with multiple flow holes.

[0013] As a further description of the above solution, the stirring mechanism includes a first motor, a gear ring, a chute, a stirring rod, and a bracket. The chute is fixed circumferentially to the top of the salt pond body by the bracket. A cover plate is also provided on the top of the chute, and the cover plate has a first connection port. A second connection port is provided circumferentially on the inner sidewall of the chute. The gear ring is rotatably disposed in the chute.

[0014] The first motor is mounted on the top of the salt pond body via a first motor bracket, and the height of the first motor is higher than the height of the gear ring. The output shaft of the first motor is provided with a first drive gear, which extends into the first connection port and meshes with the gear ring.

[0015] One end of the stirring rod is provided with a second connector, which extends horizontally into the second connection port and is fixedly connected to the toothed ring. The other end of the stirring rod extends downward into the salt pool body.

[0016] The first motor drives the stirring rod to rotate within the salt pool body via a first drive gear and a gear ring.

[0017] As a further description of the above solution, it also includes a second motor and a transmission assembly.

[0018] The second motor is mounted on the top of the salt pond body via a second motor bracket, and the second motor is located below the chute. A second drive gear is provided on the output shaft of the second motor.

[0019] The annular liquid inlet pipe assembly includes an annular liquid inlet pipe and an arc-shaped internal gear ring assembly. The annular liquid inlet pipe is located below the annular liquid return pipe and is connected to the cooling tank water inlet pipe. The inner sidewall of the annular liquid inlet pipe is provided with multiple flow holes.

[0020] The arc-shaped internal gear ring assembly includes a base plate and an arc-shaped internal gear ring, the arc-shaped internal gear ring being disposed on the side of the base plate near the interior of the salt pool body; the annular liquid inlet pipe is fixedly disposed on the base plate;

[0021] The transmission assembly is mounted on the inner wall of the salt pond body via a third connector. The upper part of the transmission assembly meshes with the second drive gear, and the lower part of the transmission assembly meshes with the arc-shaped internal gear ring.

[0022] The arc-shaped internal gear ring is driven to the second motor through the transmission assembly.

[0023] As a further description of the above solution, the second motor is a forward and reverse reversible motor; the stirring rod and the second connecting member are connected by bolts; the arc-shaped internal gear ring has a first position and a second position. When the arc-shaped internal gear ring rotates to the first position, the second motor drives the arc-shaped internal gear ring to rotate to the second position; when the arc-shaped internal gear ring rotates to the second position, the second motor drives the arc-shaped internal gear ring to rotate to the first position.

[0024] As a further description of the above solution, an arc-shaped groove is provided on the bottom plate of the annular liquid inlet pipe assembly;

[0025] The third connector is fixed to the inner wall of the salt pond body;

[0026] The transmission assembly includes an outer rod, an inner rod, and a bearing.

[0027] The upper part of the outer sleeve is provided with a first gear, which meshes with the second drive gear of the second motor;

[0028] The inner rod is located inside the outer rod and is keyed to the outer rod. A pull block is provided at the top of the inner rod. The lower part of the inner rod extends downward and passes through the arc-shaped groove. A second gear is provided at the lower part of the inner rod. The second gear meshes with the arc-shaped internal gear ring. A stop block is also provided at the bottom of the inner rod. The cross-sectional dimension of the stop block is larger than the cross-sectional dimension of the arc-shaped groove.

[0029] The bearing is sleeved on the outer sleeve rod, and the outer sleeve rod is rotatably connected to the third connecting member through the bearing.

[0030] As a further description of the above solution, the sidewall of the salt pool body is provided with a vertical groove and a sealing plate. The vertical groove is located inside the sidewall of the salt pool body, and is located on the side adjacent to the inner sidewall of the salt pool body. The sealing plate is slidably connected to the vertical groove in the vertical direction. A pipe communication cavity is provided between the sealing plate and the outer sidewall of the salt pool body, and the pipe communication cavity is isolated from the solution inside the salt pool body by the sealing plate.

[0031] The cooling tank inlet pipe extends into the pipe connecting cavity and extends vertically downwards, then extends horizontally outwards to the sealing plate and connects with the annular liquid inlet pipe. The vertical pipe section of the cooling tank inlet pipe in the pipe connecting cavity is a corrugated pipe.

[0032] As a further description of the above solution, a movable groove is provided on the side of the annular liquid inlet pipe facing the cooling tank water inlet pipe, and the movable groove is opened in the horizontal direction;

[0033] An arc-shaped inner lining baffle is provided inside the annular inlet pipe. The arc-shaped inner lining baffle is in contact with the inner wall of the annular inlet pipe on the side with the movable groove. The arc-shaped inner lining baffle is slidably connected to the inner wall of the annular return pipe, and the cross section of the arc-shaped inner lining baffle is semi-circular.

[0034] The cooling tank inlet pipe passes through the arc-shaped inner lining baffle and is connected to the annular liquid inlet pipe, and the cooling tank inlet pipe is fixedly installed on the inner lining baffle.

[0035] As a further description of the above solution, a reinforcing ring is provided on the cooling tank inlet pipe. The reinforcing ring is arranged along the radial direction of the annular inlet pipe, and the reinforcing ring is slidably connected to the outer wall of the annular inlet pipe. Advantages and effects

[0036] 1. During quenching, the nitrate solution is circulated and cooled through the inlet and outlet water pipes, while the stirring rod stirs the nitrate solution to make the overall temperature more uniform.

[0037] 2. The isothermal salt bath for the production of isothermal quenched ductile iron materials of the present invention can lift the annular inlet pipe above the nitrate solution in the salt bath body through the transmission component after the reaction is completed, so as to avoid the annular inlet pipe from solidifying in the nitrate solution. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the isothermal salt bath used for the production of isothermal quenching ductile iron materials according to an embodiment of the present invention.

[0039] Figure 2 This is a partial exploded view of the isothermal salt bath used for the production of isothermal quenched ductile iron materials according to an embodiment of the present invention.

[0040] Figure 3 This is a schematic diagram of the stirring rod in the isothermal salt bath used for the production of isothermal quenched ductile iron materials according to an embodiment of the present invention.

[0041] Figure 4 This is a cross-sectional view of an isothermal salt bath used for the production of isothermal quenched ductile iron materials according to an embodiment of the present invention.

[0042] Figure 5 This is a schematic diagram of the annular inlet pipe assembly and annular return pipe assembly of the isothermal salt bath for the production of isothermal quenched ductile iron materials according to an embodiment of the present invention. Figure 1 ;

[0043] Figure 6This is a schematic diagram of the annular inlet pipe assembly and annular return pipe assembly of the baffle in the isothermal salt bath for the production of isothermal quenched ductile iron materials according to an embodiment of the present invention. Figure 2 ;

[0044] Figure 7 This is a schematic diagram of the structure of the intermediate rod of the isothermal salt bath used in the production of isothermal quenched ductile iron materials according to an embodiment of the present invention.

[0045] Figure 8 This is a schematic diagram of the sealing plate in the isothermal salt bath used for the production of isothermal quenched ductile iron materials according to an embodiment of the present invention.

[0046] Figure 9 This is a schematic diagram of the movable tank of the isothermal salt bath used in the production of isothermal quenched ductile iron materials according to an embodiment of the present invention.

[0047] Figure 10 This is a schematic diagram of the arc-shaped inner lining baffle of the isothermal salt bath used for the production of isothermal quenched ductile iron materials according to an embodiment of the present invention.

[0048] Reference numerals: 1. Salt pool body; 11. Heater; 2. Cooling tank outlet pipe; 21. Cooling tank inlet pipe; 22. Cooling tank; 23. Water pump; 3. Annular inlet pipe; 4. Annular return pipe; 5. Flow hole; 6. Pipe connecting cavity; 61. Corrugated pipe; 62. Vertical chute; 63. Sealing plate; 7. Gear ring; 71. Stirring rod; 72. First motor; 73. First drive gear; 81. Second motor; 82. Second drive gear; 83. Second gear; 84. First gear; 86. Intermediate rod; 861. Outer rod; 862. Inner rod; 863. Shaft pin; 87. Pull block; 88. Stop block; 89. Arc groove; 9. Movable groove; 91. Arc-shaped inner lining baffle; 92. Reinforcing ring. Detailed Implementation

[0049] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0050] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0051] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0052] like Figures 1-10 As shown, the present invention provides the following technical solution:

[0053] An isothermal salt bath for the production of isothermal quenched ductile iron materials includes a salt bath body 1, an annular inlet pipe assembly, an annular return pipe assembly, a stirring mechanism, a water pump 23, a heater 11, and a cooling box 22.

[0054] The stirring mechanism is installed on the salt tank body 1 and is used to stir the solution in the salt tank body 1;

[0055] The annular inlet pipe assembly and the annular return pipe assembly are installed inside the brine tank body 1, with the annular inlet pipe assembly located above the annular return pipe assembly.

[0056] The cooling tank 22 is located outside the salt pool body 1. The cooling tank 22 is equipped with a cooling tank outlet pipe 2 and a cooling tank inlet pipe 21. The cooling tank outlet pipe 2 is connected to the annular return pipe assembly, and the cooling tank inlet pipe 21 is connected to the annular inlet pipe assembly. The water pump 23 is located on the cooling tank outlet pipe 2. The heater 11 is located at the bottom of the salt pool body 1.

[0057] The annular return pipe assembly of this invention includes an annular return pipe 4 and a first connector. The annular return pipe 4 is connected to the cooling tank outlet pipe 2. The annular return pipe 4 is disposed in the upper part of the salt tank body 1 through the first connector, and is located above the solution in the salt tank body 1. Multiple flow holes 5 are provided on the inner side wall of the annular return pipe 4. During quenching, this application circulates and cools the nitrate solution through the inlet and outlet pipes, while the stirring rod agitates the nitrate solution to make the overall temperature more uniform.

[0058] The stirring mechanism of this invention includes a first motor 72, a gear ring 7, a chute, a stirring rod 71, and a bracket. The chute is circumferentially fixed to the top of the salt pond body 1 by the bracket, and a cover plate is provided on the top of the chute. The cover plate has a first connection port. A second connection port is provided circumferentially on the inner side wall of the chute. The gear ring 7 is rotatably disposed in the chute. The first motor 72 is disposed on the top of the salt pond body 1 by a first motor bracket, and the height of the first motor 72 is higher than the height of the gear ring. The output shaft of the first motor 72 is provided with a first drive gear 73, which extends into the first connection port and meshes with the gear ring 7.

[0059] One end of the stirring rod 71 is provided with a second connector, which extends horizontally into the second connection port and is fixedly connected to the gear ring 7. The other end of the stirring rod 71 extends downward into the salt pool body 1. The first motor 72 drives the stirring rod 71 to rotate inside the salt pool body 1 through the first drive gear 73 and the gear ring 7.

[0060] The embodiments of the present invention also include a second motor and a transmission assembly, wherein the second motor 81 is mounted on the top of the salt pool body 1 via a second motor bracket and is located below the slide groove, and a second drive gear 82 is mounted on the output shaft of the second motor 81;

[0061] The annular liquid inlet pipe assembly includes an annular liquid inlet pipe 3 and an arc-shaped internal gear ring assembly 8. The annular liquid inlet pipe 3 is located below the annular liquid return pipe 4 and is connected to the cooling box water inlet pipe 21. Multiple flow holes 5 are provided on the inner side wall of the annular liquid inlet pipe 3.

[0062] The arc-shaped internal gear ring assembly 8 includes a base plate and an arc-shaped internal gear ring, with the arc-shaped internal gear ring disposed on the side of the base plate near the interior of the salt pool body 1; the annular liquid inlet pipe 3 is fixedly disposed on the base plate.

[0063] The transmission component is installed on the inner wall of the salt pool body 1 through the third connector. The upper part of the transmission component meshes with the second drive gear 82, and the lower part of the transmission component meshes with the arc-shaped internal gear ring.

[0064] The arc-shaped internal gear ring is driven and connected to the second motor 81 through the transmission assembly.

[0065] In this embodiment of the invention, the second motor 81 is a reversible motor. Specifically, the second motor 81 is an AC servo motor of model 60ST-M00630. The stirring rod 71 is connected to the second connecting member by bolts. The arc-shaped internal gear ring has a first position and a second position. When the arc-shaped internal gear ring rotates to the first position, the second motor 81 drives the arc-shaped internal gear ring to rotate to the second position; when the arc-shaped internal gear ring rotates to the second position, the second motor 81 drives the arc-shaped internal gear ring to rotate to the first position. During quenching, the second motor 81 drives the arc-shaped internal gear ring to rotate the annular inlet pipe 3 in both clockwise and counterclockwise directions. This method can assist the stirring rod 71 in stirring the nitrate solution in the salt pool body 1, and at the same time, it can make the nitrate solution entering the annular inlet pipe 3 more uniform.

[0066] The bottom plate of the annular inlet pipe assembly of this embodiment of the invention has an arc-shaped groove 89; the third connector is fixed to the inner wall of the salt pool body 1; the assembly includes an intermediate rod 86, which includes an outer rod 861, an inner rod 862, and a bearing.

[0067] The upper part of the outer sleeve rod 861 is provided with a first gear 84, which meshes with the second drive gear 82 of the second motor 81;

[0068] The inner rod 862 is located inside the outer rod 861 and is keyed to the outer rod 861. A pull block 87 is provided at the top of the inner rod 862. The lower part of the inner rod 862 extends downward and passes through the arc-shaped groove 89. A second gear 83 is provided at the lower part of the inner rod 862. The second gear 83 meshes with the arc-shaped internal gear ring. A stop block 88 is also provided at the bottom of the inner rod 862. The cross-sectional dimension of the stop block 88 is larger than the cross-sectional dimension of the arc-shaped groove 89. The bearing is sleeved on the outer rod 861, and the outer rod 861 is rotatably connected to the third connecting member through the bearing.

[0069] The transmission assembly of this invention has a retracted form. In the retracted form, the inner rod 862 can be driven upward by the pull block 87, thereby moving the annular inlet pipe 3 above the solution. At this time, the flat key 863 and the outer rod 861 separate. Then, the inner rod 862 is rotated so that the lower end of the flat key 863 abuts against the upper end of the outer rod 861, fixing the height position of the inner rod 862 and the annular inlet pipe 3. This application can achieve the adjustment of the height position of the annular inlet pipe 3 through the transmission assembly.

[0070] In this embodiment of the invention, the side wall of the salt pool body 1 is provided with a vertical sliding groove 62 and a sealing plate. The vertical sliding groove 62 is arranged vertically within the side wall of the salt pool body 1, and is located on the side adjacent to the inner side wall of the salt pool body 1. The sealing plate 63 is slidably connected to the vertical sliding groove 62 in the vertical direction. A pipe connecting cavity 6 is provided between the sealing plate 63 and the outer side wall of the salt pool body 1. The pipe connecting cavity 6 is isolated from the solution in the salt pool body 1 by the sealing plate 63. The cooling tank inlet pipe 21 extends into the pipe connecting cavity 6 and extends vertically downward, then extends horizontally out of the sealing plate 63 and connects with the annular liquid inlet pipe 3. The vertical pipe section of the cooling tank inlet pipe 21 in the pipe connecting cavity 6 is a corrugated pipe. By setting the vertical pipe section in the pipe connecting cavity 6 as a corrugated pipe, this application can raise the annular liquid inlet pipe 3 above the condensed nitrate solution in the salt pool body 1 after the experiment, avoiding the annular liquid inlet pipe 3 from solidifying in the nitrate solution.

[0071] In this embodiment of the invention, a movable groove 9 is provided on the side of the annular liquid inlet pipe 3 facing the cooling tank water inlet pipe 21, wherein the movable groove 9 is opened in the horizontal direction;

[0072] An arc-shaped inner lining baffle 91 is provided inside the annular inlet pipe 3. The arc-shaped inner lining baffle 91 is in contact with the inner wall of the annular inlet pipe 3 on the side where the movable groove 9 is provided. The arc-shaped inner lining baffle 91 is slidably connected to the inner wall of the annular return pipe 4, and the cross section of the arc-shaped inner lining baffle 91 is semi-circular.

[0073] The cooling tank inlet pipe 21 passes through the arc-shaped inner liner baffle 91 and is connected to the annular liquid inlet pipe 3. The cooling tank inlet pipe 21 is fixedly mounted on the inner liner baffle 91. By setting the arc-shaped inner liner baffle 91, this application enables the arc-shaped inner liner baffle 91 to rotate relative to the annular liquid inlet pipe 3 when the annular liquid inlet pipe 3 reciprocates, while maintaining contact with the edge of the movable groove 9, thus sealing the movable groove 9 and preventing nitrate solution from entering the annular liquid inlet pipe 3 through the movable groove 9.

[0074] In this embodiment of the invention, a reinforcing ring 92 is provided on the cooling tank inlet pipe 21. The reinforcing ring 92 is arranged along the radial direction of the annular inlet pipe 3 and is slidably connected to the outer wall of the annular inlet pipe 3. The design of the reinforcing ring 92 in this application can improve the stability of the annular inlet pipe 3 when it rotates.

[0075] The operation process of this invention is as follows:

[0076] During quenching, the spheroidal cast iron is placed inside the salt pool body. Then, the first motor 72, the second motor 81, and the water pump 23 are turned on. The first motor 72 drives the stirring rod 71 to rotate and stir the solution. At the same time, the solution enters the annular inlet pipe 3 and the cooling tank 22 through the flow hole under the action of the water pump 23 for cooling and cooling. Finally, it is discharged through the annular return pipe 4 and re-enters the salt pool body 1. Meanwhile, the reciprocating rotation of the annular inlet pipe 3 can make the solution in the salt pool body 1 evenly discharged for cooling and circulation. After the reaction is completed, the first motor 72 and the water pump 23 are turned off. The inner rod 862 is moved upward by the pull block 87 until the annular inlet pipe 3 is moved above the solution. At this time, the flat key 863 and the outer rod 861 are separated. Then, the inner rod 862 is rotated so that the lower end of the flat key 863 and the upper end of the outer rod 861 abut against each other, fixing the inner rod 862 and thus fixing the annular inlet pipe 3 to prevent the annular inlet pipe 3 from solidifying in the nitrate solution. Then, the water pump 23 is restarted to discharge the solution remaining in the annular inlet pipe 3 and the annular return pipe 4, reducing the phenomenon of solution solidifying in the pipes when not in use, so that it can be used next time.

[0077] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all embodiments here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. An isothermal salt bath for the production of isothermal quenching ductile iron materials, characterized in that: It includes a salt pool body (1), an annular inlet pipe assembly, an annular return pipe assembly, a stirring mechanism, a water pump (23), a heater (11), and a cooling tank (22). The stirring mechanism is installed on the salt pool body (1) and is used to stir the solution in the salt pool body (1); The annular inlet pipe assembly and the annular return pipe assembly are disposed inside the salt pool body (1), and the annular inlet pipe assembly is located above the annular return pipe assembly. The cooling tank (22) is located outside the salt pool body (1). The cooling tank (22) is provided with a cooling tank outlet pipe (2) and a cooling tank inlet pipe (21). The cooling tank outlet pipe (2) is connected to the annular return pipe assembly, and the cooling tank inlet pipe (21) is connected to the annular inlet pipe assembly. The water pump (23) is installed on the outlet pipe (2) of the cooling tank; the heater (11) is installed at the bottom of the salt pool body (1); The annular return pipe assembly includes an annular return pipe (4) and a first connector. The annular return pipe (4) is connected to the cooling tank outlet pipe (2). The annular return pipe (4) is set in the upper part of the salt pool body (1) through the first connector and is located above the solution in the salt pool body (1). The inner side wall of the annular return pipe (4) is provided with multiple flow holes (5). The stirring mechanism includes a first motor (72), a gear ring (7), a chute, a stirring rod (71), and a bracket. The chute is fixed circumferentially to the top of the salt pond body (1) by the bracket. A cover plate is also provided on the top of the chute, and the cover plate has a first connection port. A second connection port is provided circumferentially on the inner sidewall of the chute. The gear ring (7) is rotatably disposed in the chute. The first motor (72) is disposed on the top of the salt pond body (1) by a first motor bracket, and the height of the first motor (72) is higher than the height of the gear ring. The output shaft of the machine (72) is provided with a first drive gear (73), which extends into the first connection port and meshes with the gear ring (7); one end of the stirring rod (71) is provided with a second connector, which extends horizontally into the second connection port and is fixedly connected to the gear ring (7); the other end of the stirring rod (71) extends downward into the salt pond body (1); the first motor (72) drives the stirring rod (71) to rotate within the salt pond body (1) through the first drive gear (73) and the gear ring (7); The isothermal salt bath for the production of isothermal quenched ductile iron materials also includes a second motor and a transmission assembly. The second motor (81) is mounted on the top of the salt bath body (1) via a second motor bracket, and the second motor (81) is located below the slide. A second drive gear (82) is provided on the output shaft of the second motor (81). The annular liquid inlet pipe assembly includes an annular liquid inlet pipe (3) and an arc-shaped internal gear ring assembly (8). The annular liquid inlet pipe (3) is located below the annular liquid return pipe (4), and the annular liquid inlet pipe (3) is connected to the cooling tank water inlet pipe (21). The inner wall of the annular inlet pipe (3) is provided with multiple flow holes (5); the arc-shaped internal gear ring assembly (8) includes a base plate and an arc-shaped internal gear ring, the arc-shaped internal gear ring is disposed on the side of the base plate near the interior of the salt pool body (1); the annular inlet pipe (3) is fixedly disposed on the base plate; the transmission assembly is disposed on the inner wall of the salt pool body (1) through a third connector, the upper part of the transmission assembly meshes with the second drive gear (82), and the lower part of the transmission assembly meshes with the arc-shaped internal gear ring; the arc-shaped internal gear ring is drivenly connected to the second motor (81) through the transmission assembly; The bottom plate of the annular inlet pipe assembly is provided with an arc-shaped groove (89); the third connector is fixed on the inner wall of the salt pool body (1); the transmission assembly includes an intermediate rod (86) including an outer rod (861), an inner rod (862) and a bearing, the upper part of the outer rod (861) is provided with a first gear (84), the first gear (84) meshes with the second drive gear (82) of the second motor (81); the inner rod (862) is located inside the outer rod (861), and the inner rod (862) is keyed to the outer rod (861), so The inner rod (862) is provided with a pull block (87) at the top. The lower part of the inner rod (862) extends downward and passes through the arc-shaped groove (89). A second gear (83) is provided at the lower part of the inner rod (862). The second gear (83) meshes with the arc-shaped internal gear ring. A stop block (88) is also provided at the bottom of the inner rod (862). The cross-sectional dimension of the stop block (88) is larger than the cross-sectional dimension of the arc-shaped groove (89). The bearing is sleeved on the outer rod (861). The outer rod (861) is rotatably connected to the third connecting member through the bearing.

2. The isothermal salt bath for isothermal quenching of ductile iron materials according to claim 1, characterized in that: The second motor (81) is a forward and reverse motor; the stirring rod (71) is connected to the second connecting member by bolts; the arc-shaped internal gear ring has a first position and a second position. When the arc-shaped internal gear ring rotates to the first position, the second motor (81) drives the arc-shaped internal gear ring to rotate to the second position; when the arc-shaped internal gear ring rotates to the second position, the second motor (81) drives the arc-shaped internal gear ring to rotate to the first position.

3. The isothermal salt bath for isothermal quenching ductile iron material production according to claim 1, characterized in that: The side wall of the salt pool body (1) is provided with a vertical sliding groove (62) and a sealing plate (63). The vertical sliding groove (62) is located inside the side wall of the salt pool body (1) and is located on one side adjacent to the inner side wall of the salt pool body (1). The sealing plate (63) is slidably connected to the vertical sliding groove (62) in the vertical direction. A pipe connecting cavity (6) is provided between the sealing plate (63) and the outer wall of the salt pool body (1). The pipe connecting cavity (6) is isolated from the solution inside the salt pool body (1) by the sealing plate (63). The cooling tank inlet pipe (21) extends into the pipe connecting cavity (6) and extends vertically downwards. Then, it extends horizontally outwards through the sealing plate (63) and connects with the annular liquid inlet pipe (3). The vertical pipe section of the cooling tank inlet pipe (21) in the pipe connecting cavity (6) is a corrugated pipe.

4. The isothermal salt bath for the production of isothermal quenched ductile iron materials according to claim 3, characterized in that: The annular liquid inlet pipe (3) has a movable groove (9) on the side facing the cooling tank water inlet pipe (21), and the movable groove (9) is opened in the horizontal direction; An arc-shaped inner liner baffle (91) is provided inside the annular liquid inlet pipe (3). The arc-shaped inner liner baffle (91) is in contact with the inner wall of the annular liquid inlet pipe (3) on the side where the movable groove (9) is provided. The arc-shaped inner liner baffle (91) is slidably connected to the inner wall of the annular liquid return pipe (4). The cross section of the arc-shaped inner liner baffle (91) is semi-circular. The cooling tank water inlet pipe (21) passes through the arc-shaped inner lining baffle (91) and is connected to the annular liquid inlet pipe (3), and the cooling tank water inlet pipe (21) is fixedly installed on the inner lining baffle (91).

5. The isothermal salt bath for the production of isothermal quenched ductile iron materials according to claim 1, characterized in that: A reinforcing ring (92) is provided on the cooling tank water inlet pipe (21). The reinforcing ring (92) is arranged along the radial direction of the annular liquid inlet pipe (3), and the reinforcing ring (92) is slidably connected to the outer wall of the annular liquid inlet pipe (3).

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