A salt bath quenching furnace and quenching method

Abstract

This invention relates to the field of salt bath quenching technology, specifically to a salt bath quenching furnace and quenching method. The salt bath quenching furnace includes a furnace body with a fixed plate on the furnace body. Below the fixed plate is a hanging basket assembly, which includes at least two annular support frames. The axis of each annular support frame extends vertically. Each annular support frame has the same shape and is composed of two circular wave rings. The interval between the two circular wave rings forms a circular wave slide for placing bearing steel balls. A toggle plate is correspondingly provided above each annular support frame. The fixed plate is also provided with a first driving mechanism and a second driving mechanism. The first driving mechanism can independently control the vertical movement of each annular support frame, thereby staggering the annular support frames vertically. The second driving mechanism can drive the toggle plate to rotate synchronously around the vertical axis, thereby causing the bearing steel balls to roll on the corresponding circular wave slide, improving the quenching quality of the bearing steel balls.

Description

Technical Field

[0001] This invention relates to the field of salt bath quenching technology, and in particular to a salt bath quenching furnace and quenching method. Background Technology

[0002] A salt bath quenching furnace is an industrial furnace that uses molten salt as a heating medium to immerse workpieces in the salt solution for heating. Currently, bearing workpieces are typically processed using salt bath quenching furnaces.

[0003] Patent document CN103924047B discloses a quenching device that uses a basket to transfer quenching, isothermal, or tempering processes within the same tank, specifically for transferring bainite from a bearing salt bath. However, when using this basket to transfer bearing steel balls, the accumulation of multiple bearing steel balls in the basket leads to contact stress between them during heating. Consequently, the bearing steel balls at the bottom of the basket are easily deformed by compression, and the small gaps between the bearing steel balls make it difficult for them to contact the molten salt, resulting in poor quenching quality. Summary of the Invention

[0004] Therefore, it is necessary to provide a salt bath quenching furnace and quenching method to address the technical problem that the current hanging basket affects the quenching quality of bearing steel balls.

[0005] The above objectives are achieved through the following technical solutions:

[0006] A salt bath quenching furnace includes a furnace body with a fixed plate on it. Below the fixed plate is a hanging basket assembly. The hanging basket assembly includes at least two coaxially arranged annular support frames, each extending vertically along its axis. Each annular support frame has the same shape and consists of two circular wave rings on the same horizontal plane, coaxially arranged. The gap between the two wave rings forms a circular wave track for holding bearing steel balls. Above each annular support frame is a corresponding actuating plate, coaxially arranged with the annular support frame, which presses the bearing steel balls downwards under its own weight. The fixed plate also includes a first driving mechanism and a second driving mechanism. The first driving mechanism can independently control the vertical movement of each annular support frame, thus staggering at least two annular support frames vertically. The second driving mechanism can drive at least two actuating plates to rotate synchronously around a vertical axis, causing the actuating plates to roll the bearing steel balls on the corresponding circular wave tracks.

[0007] Furthermore, the circular wave slide has a crest section, a trough section, and a connecting section. The crest section and the trough section extend radially along the circular wave slide, and the connecting section is located between the crest section and the trough section. In the radial direction of the annular support frame, the width of the crest section and the trough section are the same, and the width of the connecting section is smaller than the width of the crest section.

[0008] Furthermore, the first drive mechanism includes a dual-axis motor, the number of which is the same as the number of annular support frames, with each dual-axis motor corresponding to one annular support frame. The dual-axis motor has a first output shaft and a second output shaft that rotate synchronously. Both the first output shaft and the second output shaft extend in the horizontal direction, and two steel wire ropes are wound on both the first output shaft and the second output shaft. Each steel wire rope is connected to a circular wave ring.

[0009] Furthermore, each actuating plate is provided with multiple arc-shaped clearance grooves in the circumferential direction. The arc-shaped clearance grooves are coaxially arranged with the actuating plate and are used for the steel wire rope to pass through.

[0010] Furthermore, the upper surface of the actuating plate is provided with an annular baffle, which is arranged around the arc-shaped clearance groove, and the annular baffle has a certain height in the vertical direction.

[0011] Furthermore, the second driving mechanism is a drive motor, and the output end of the drive motor is provided with a drive rod that extends in the horizontal direction. Each actuation plate is provided with two slide rods that extend in the vertical direction. The slide rods are slidably connected to the drive rods and can slide relative to the drive rods in the vertical direction. The drive rods rotate around the vertical axis and drive each actuation plate to rotate synchronously around the vertical axis through the slide rods.

[0012] Furthermore, the upper surface of each actuating plate is a conical ring, and the inner circumferential surface of the actuating plate is set away from the fixed plate relative to the outer circumferential surface of the actuating plate, and the upper surfaces of at least two actuating plates can form a conical surface.

[0013] Furthermore, there are three actuating plates and three annular support frames. The actuating plates are, from the inside out, a first actuating plate, a second actuating plate, and a third actuating plate. The horizontal cross-section of the first actuating plate is circular, and the horizontal cross-sections of the second and third actuating plates are annular. The outer circumferential surface of the first actuating plate is provided with a first external gear ring, the inner circumferential surface of the second actuating plate is provided with a second internal gear ring, the outer circumferential surface of the second actuating plate is provided with a second external gear ring, and the inner circumferential surface of the third actuating plate is provided with a third internal gear ring. The first external gear ring meshes with the second internal gear ring, and the second external gear ring meshes with the third internal gear ring.

[0014] Furthermore, the actuating plate has multiple drainage holes evenly distributed thereon, which allow molten salt solution to pass through.

[0015] A salt bath quenching method, using the aforementioned salt bath quenching furnace, includes the following steps:

[0016] S1. Place the bearing steel balls evenly on the circular wave slide of each annular support frame;

[0017] S2. Control the first drive mechanism to lower at least two annular support frames into the interior of the furnace body and set them staggered in the vertical direction;

[0018] S3. Then control the second drive mechanism to drive at least two actuating plates to rotate synchronously, so that the actuating plates drive the bearing steel balls to roll on the corresponding circular wave slide.

[0019] The beneficial effects of this invention are:

[0020] The present invention provides a salt bath quenching furnace and quenching method. First, bearing steel balls are arranged separately on each annular support frame, and the annular support frames are staggered in the vertical direction. In this way, the bearing steel balls on adjacent annular support frames do not contact each other. Furthermore, since the bearing steel balls can roll on the circular wave slides of each annular support frame, the contact position between the bearing steel balls and the annular support frames is constantly changing. This ensures that all positions on the surface of the bearing steel balls can contact the molten salt, making it less likely for heating dead zones to occur, thereby improving the quenching quality of the bearing steel balls in the salt bath furnace.

[0021] Secondly, because the width of the connecting section is smaller than the width of the crest and trough sections, and the wider the section, the greater the distance between the two circular corrugated rings of the annular support frame, the more the lower end of the bearing steel ball moves downward between the two circular corrugated rings. Thus, in the vertical direction, the height of the bearing steel ball in the connecting section is greater than its height in the crest and trough sections. This ensures that when the bearing steel ball rolls on the circular corrugated slide, it will eventually stop at the crest or trough section, maintaining a certain distance between the bearing steel balls on each annular support frame and preventing them from contacting each other. This allows the molten salt to fully contact each bearing steel ball, improving the quenching quality of individual bearing steel balls.

[0022] Third, since the bearing steel balls are evenly distributed in the circumferential, radial and vertical directions along the annular support frame inside the furnace, when the agitator plate drives the bearing steel balls to rotate, the bearing steel balls can stir the molten salt liquid and reduce the deposition of slag.

[0023] Fourth, after the bearing steel balls are heated, at least two actuating plates are made to form a conical surface, which can form a retrieval tool, thereby facilitating the retrieval of slag.

[0024] Fifth, by controlling the sequence of each annular support frame entering and exiting the furnace body through the first drive mechanism, it is possible to ensure that the heating time of the bearing steel balls on each annular support frame is consistent, thereby making the heating of each bearing steel ball more uniform. Attached Figure Description

[0025] Figure 1 A three-dimensional structural schematic diagram of a salt bath quenching furnace provided in an embodiment of the present invention;

[0026] Figure 2This is a schematic diagram of the structure of the fixing plate and hanging basket assembly in a salt bath quenching furnace according to an embodiment of the present invention;

[0027] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0028] Figure 4 for Figure 2 Side view;

[0029] Figure 5 for Figure 4 Enlarged view of the structure at point B in the middle;

[0030] Figure 6 for Figure 4 CC section view;

[0031] Figure 7 for Figure 6 Enlarged view of the structure at point D;

[0032] Figure 8 This is a schematic diagram of the connection section of the bearing steel ball in the annular support frame in a salt bath quenching furnace according to an embodiment of the present invention;

[0033] Figure 9 A schematic diagram of the bearing steel ball in the crest section of the annular support frame in a salt bath quenching furnace according to an embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the structure of the annular support frame in a salt bath quenching furnace according to an embodiment of the present invention;

[0035] Figure 11 This is a schematic diagram of the annular support frame and the actuating plate in a first state in a salt bath quenching furnace according to an embodiment of the present invention.

[0036] Figure 12 for Figure 11 Side view;

[0037] Figure 13 This is a schematic diagram of the annular support frame and the actuating plate in a second state in a salt bath quenching furnace according to an embodiment of the present invention;

[0038] Figure 14 for Figure 13 Side view.

[0039] in:

[0040] 100. Furnace body; 101. Fixing plate; 102. Dual-shaft motor; 103. Drive motor; 104. Drive rod; 105. Slide rail; 110. Annular support frame; 1101. Crest section; 1102. Connecting section; 1103. Valley section; 111. First actuating plate; 112. Steel wire rope; 113. Slide rod; 114. Annular baffle; 115. Second actuating plate; 116. Bearing steel ball; 117. Guide rod; 118. Third actuating plate. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0042] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] like Figures 1 to 14As shown, an embodiment of the present invention provides a salt bath quenching furnace, including a furnace body 100. A fixing plate 101 is provided on the furnace body 100, and a hanging basket assembly is provided below the fixing plate 101. The hanging basket assembly includes at least two coaxially arranged annular support frames 110. The axis of each annular support frame 110 extends in the vertical direction. Each annular support frame 110 has the same shape and is composed of two circular wave rings. The two circular wave rings are on the same horizontal plane and are coaxially arranged inside and outside. The interval between the two circular wave rings forms a circular wave slide, which is used to place bearing steel balls 116. Each annular support frame 110 is provided with a corresponding actuating plate above it. The actuating plate is coaxially arranged with the annular support frame 110. The actuating plate presses the bearing steel ball 116 downward by its own weight. The fixed plate 101 is also provided with a first driving mechanism and a second driving mechanism. The first driving mechanism can control the up and down movement of each annular support frame 110 independently, so that at least two annular support frames 110 are staggered in the vertical direction. The second driving mechanism can drive at least two actuating plates to rotate synchronously around the vertical axis, so that the actuating plates drive the bearing steel ball 116 to roll on the corresponding circular wave track.

[0045] The number of annular support frames 110 can be two, three, four, etc. The number of actuating plates is the same as the number of annular support frames 110. The furnace body 100 is provided with a slide rail 105, and the fixing plate 101 can slide along the slide rail 105, thereby adjusting the position of the hanging basket assembly in the furnace body 100.

[0046] In this way, the bearing steel balls 116 are arranged separately on each annular support frame 110, and the annular support frames 110 are staggered in the vertical direction. This ensures that the bearing steel balls 116 on adjacent annular support frames 110 do not contact each other. Furthermore, since the bearing steel balls 116 can roll on the circular wave slides of each annular support frame 110, the contact position between the bearing steel balls 116 and the annular support frame 110 is constantly changing. This allows all positions on the surface of the bearing steel balls 116 to contact the molten salt, making it less likely for heating dead zones to occur, thereby improving the quenching quality of the bearing steel balls 116 in the salt bath furnace.

[0047] like Figure 10 As shown, the circular wave slide has a crest section 1101, a trough section 1103, and a connecting section 1102. The crest section 1101 and the trough section 1103 both extend radially along the circular wave slide. The connecting section 1102 is located between the crest section 1101 and the trough section 1103. In the radial direction of the annular support frame 110, the widths of the crest section 1101 and the trough section 1103 are the same, and the width of the connecting section 1102 is smaller than the width of the crest section 1101.

[0048] The wider the width, the greater the distance between the two circular corrugated rings of the annular support frame 110, allowing the lower end of the bearing steel ball 116 to move downwards a greater distance between the two circular corrugated rings. For example... Figure 8 and Figure 9 As shown, in the vertical direction, the height of the bearing steel ball 116 at the connecting section 1102 is higher than the height of the bearing steel ball 116 at the crest section 1101. Since the widths of the crest section 1101 and the trough section 1103 are the same, the heights of the bearing steel ball 116 at the crest section 1101 and the trough section 1103 are also the same. This ensures that when the bearing steel ball 116 rolls on the circular wave track, it will eventually stop at either the crest section 1101 or the trough section 1103, maintaining a certain distance between the bearing steel balls 116 on each annular support frame 110, preventing them from contacting each other. This allows the molten salt to fully contact each bearing steel ball 116, improving the quenching quality of each individual bearing steel ball 116.

[0049] like Figure 6 As shown, the first drive mechanism includes a dual-axis motor 102. The number of dual-axis motors 102 is the same as the number of annular support frames 110. Each dual-axis motor 102 corresponds to one annular support frame 110. The dual-axis motor 102 has a first output shaft and a second output shaft that rotate synchronously. Both the first output shaft and the second output shaft extend in the horizontal direction. Two steel wire ropes 112 are wound on both the first output shaft and the second output shaft. Each steel wire rope 112 is connected to a circular wave ring.

[0050] The dual-axis motors 102 are distributed vertically, with the uppermost motor corresponding to the outermost annular support frame 110 and the lowermost motor corresponding to the innermost annular support frame 110, thus preventing interference between the wire ropes 112. The first and second output shafts are integrally formed, and the wire ropes 112 on the first and second output shafts are symmetrically distributed, with at least two wire ropes 112 connected to the dual-axis motors 102 all on the same vertical plane. This ensures an orderly distribution of the wire ropes 112 and prevents mutual interference.

[0051] like Figure 3 As shown, each actuating plate has multiple arc-shaped clearance grooves arranged around its circumference. These arc-shaped clearance grooves are coaxially aligned with the actuating plate and are used for the passage of the wire rope 112. When the actuating plate rotates around its vertical axis, it drives the arc-shaped clearance grooves to rotate synchronously, causing the wire rope 112 to slide within them. Two arc-shaped clearance grooves are arranged radially around the annular support frame 110, ensuring a one-to-one correspondence between the wire rope 112 and the arc-shaped clearance groove.

[0052] Furthermore, the upper surface of the actuating plate is provided with an annular baffle 114, which surrounds the arc-shaped clearance groove and has a certain height in the vertical direction. The design of the annular baffle 114 can prevent slag from entering the arc-shaped clearance groove.

[0053] like Figure 6 As shown, the second driving mechanism is a drive motor 103. The output end of the drive motor 103 is equipped with a drive rod 104, which extends horizontally. Each actuating plate has two sliding rods 113 extending vertically. The sliding rods 113 are slidably connected to the drive rod 104 and can slide relative to the drive rod 104 in the vertical direction. Thus, when the annular support frame 110 moves up and down, causing the actuating plates to move up and down, the sliding rods 113 on the actuating plates can slide relative to the drive rod 104. When the drive rod 104 rotates around its vertical axis, it can drive the actuating plates to rotate synchronously around the vertical axis via the sliding rods 113. Figure 3 As shown, the vertical plane containing the multiple sliding rods 113 is perpendicular to the vertical plane containing the multiple wire ropes 112. Figure 7 As shown, each of the two circular wave rings of each annular support frame 110 is provided with a guide rod 117. The vertical plane where the multiple guide rods 117 are located coincides with the vertical plane where the slide rod 113 is located. The actuating plate is also provided with an arc-shaped clearance groove corresponding to the position of each guide rod 117, so that each guide rod 117 can extend into the arc-shaped clearance groove.

[0054] like Figure 3 and Figure 7 As shown, the upper surface of each actuating plate is a conical ring, and the inner circumferential surface of the actuating plate is positioned away from the fixed plate 101 relative to the outer circumferential surface of the actuating plate. At least two actuating plates can form a conical surface on their upper surfaces. In this way, after the bearing steel ball 116 is heated, at least two actuating plates can form a conical surface, thereby forming a retrieval tool to facilitate the retrieval of slag.

[0055] like Figures 11 to 14 As shown, both the actuating plate and the annular support frame 110 have three actuating plates. From the inside out, the actuating plates are a first actuating plate 111, a second actuating plate 115, and a third actuating plate 118. The horizontal cross-section of the first actuating plate 111 is circular, while the horizontal cross-sections of the second actuating plate 115 and the third actuating plate 118 are annular. The outer circumferential surface of the first actuating plate 111 has a first external gear ring, the inner circumferential surface of the second actuating plate 115 has a second internal gear ring, and the inner circumferential surface of the third actuating plate 118 has a third internal gear ring. The first external gear ring meshes with the second internal gear ring, and the second external gear ring meshes with the third internal gear ring. In this way, the three actuating plates can mesh with each other, further ensuring synchronous rotation, while avoiding gaps between the actuating plates, so that the slag can remain on the actuating plates.

[0056] Furthermore, the actuating plate has multiple drainage holes (not shown in the figure) evenly distributed therethrough, which allow the molten brine to pass through. During the removal of filter residue, the molten brine leaks downwards through the drainage holes.

[0057] Based on the above embodiments, the usage principle and working process of the present invention are as follows:

[0058] First, the bearing steel balls 116 are placed sequentially on the crest sections 1101 and trough sections 1103 of the three annular support frames 110. Then, three dual-axis motors 102 are controlled to move the three annular support frames 110 via steel wire ropes 112, positioning the innermost annular support frame 110 at the bottom, the middle annular support frame 110 in the middle position, and the outermost annular support frame 110 at the top. Simultaneously, the first actuating plate 111 moves downward with the innermost annular support frame 110, the second actuating plate 115 moves downward with the middle annular support frame 110, and the third actuating plate 118 moves downward with the outermost annular support frame 110. This arrangement causes the annular support frames 110 and the actuating plates to form a […]. Figure 11 and Figure 12 The first state is shown. During the process of entering the molten brine, the bearing steel ball 116 on the innermost annular support frame 110 contacts the molten brine first, and the bearing steel ball 116 on the outermost annular support frame 110 contacts the molten brine last.

[0059] During the salt bath quenching heating process, the drive motor 103 drives the drive rod 104 to reciprocate. The maximum rotation angle is the angle of the arc-shaped clearance groove. The drive rod 104 synchronously drives the first actuating plate 111, the second actuating plate 115, and the third actuating plate 118 to reciprocate, thereby driving the bearing steel balls 116 on the three annular support frames 110 to roll along the circular wave slide, so that the contact position between the bearing steel balls 116 and the annular support frame 110 changes continuously, and the molten salt can fully contact each bearing steel ball 116.

[0060] After heating for a certain period of time, the dual-axis motor 102 is controlled to drive the three annular support frames 110 to move via the wire rope 112. This positions the innermost annular support frame 110 at the top, the middle annular support frame 110 in the middle position, and the outermost annular support frame 110 at the bottom. Simultaneously, the first actuating plate 111 moves upward with the innermost annular support frame 110, the second actuating plate 115 moves upward with the middle annular support frame 110, and the third actuating plate 118 moves upward with the outermost annular support frame 110. This arrangement causes the annular support frames 110 and the actuating plates to form a […]. Figure 13 and Figure 14The second state is shown. When detaching from the molten salt, the bearing steel balls 116 on the innermost annular support frame 110 detach from the molten salt first, and the bearing steel balls 116 on the outermost annular support frame 110 detach from the molten salt last. This ensures that the heating time of the bearing steel balls 116 on each annular support frame 110 is consistent, resulting in more uniform heating of each bearing steel ball 116.

[0061] Since the bearing steel balls 116 are evenly distributed in the circumferential, radial and vertical directions along the annular support frame 110 inside the furnace body 100, when the agitator plate drives the bearing steel balls 116 to rotate, the bearing steel balls 116 can stir the molten salt liquid and reduce the deposition of slag.

[0062] Finally, when it is time to remove the slag, remove the bearing steel balls 116 from each annular support frame 110. Then control the dual-axis motor 102 to make the three annular support frames 110 and the actuating plate move in the same direction. Figure 6 The state shown is as follows. At this time, the three actuating plates mesh with each other and their upper surfaces form a conical surface. Then, they enter the molten brine to remove slag. The slag will remain on the actuating plates, and the molten brine will leak downward from the drain hole, thereby realizing the slag removal operation.

[0063] A salt bath quenching method, using the salt bath quenching furnace described in the above embodiments, includes the following steps:

[0064] S1. Place the bearing steel balls 116 evenly on the circular wave slides of each annular support frame 110;

[0065] S2. Control the first drive mechanism to lower at least two annular support frames 110 into the interior of the furnace body 100 and stagger them in the vertical direction;

[0066] S3. Then control the second drive mechanism to drive at least two actuating plates to rotate synchronously, so that the actuating plates drive the bearing steel balls 116 to roll on the corresponding circular wave slide.

[0067] Furthermore, it also includes the following steps:

[0068] S4. After the salt bath quenching and heating is completed, the first drive mechanism drives the annular support frame 110 to move up and down, so that at least two actuating plates form a conical surface, thereby scooping up the slag.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A salt bath quenching furnace, characterized in that, The system includes a furnace body with a fixed plate on it. Below the fixed plate is a hanging basket assembly. The hanging basket assembly includes at least two coaxially arranged annular support frames. The axis of each annular support frame extends vertically. Each annular support frame has the same shape and is composed of two circular wave rings. The two circular wave rings are on the same horizontal plane and are coaxially arranged. The gap between the two circular wave rings forms a circular wave slide, which is used to place bearing steel balls. Above each annular support frame, there is a corresponding actuating plate. The actuating plate is coaxially arranged with the annular support frame and presses the bearing steel balls downward by its own weight. The fixed plate is also provided with a first driving mechanism and a second driving mechanism; the first driving mechanism can individually control the up and down movement of each annular support frame, thereby staggering at least two annular support frames in the vertical direction; the second driving mechanism can drive at least two actuating plates to rotate synchronously around a vertical axis, thereby causing the actuating plates to drive the bearing steel balls to roll on the corresponding circular wave slide. The first driving mechanism includes a dual-axis motor, the number of which is the same as the number of annular support frames, with each dual-axis motor corresponding to one annular support frame. The dual-axis motor has a synchronously rotating first output shaft and a second output shaft, both of which are horizontal. Extending in the direction, two steel wire ropes are wound on both the first and second output shafts, each steel wire rope being connected to a circular wave ring. Each actuating plate has multiple arc-shaped clearance grooves arranged around its circumference. The arc-shaped clearance grooves are coaxially arranged with the actuating plate and are used for the steel wire ropes to pass through. The second driving mechanism is a drive motor, and the output end of the drive motor is provided with a drive rod that extends horizontally. Each actuating plate is provided with two sliding rods that extend vertically. The sliding rods are slidably connected to the drive rods and can slide relative to the drive rods in the vertical direction. The rotation of the drive rod around the vertical axis drives each actuating plate to rotate synchronously around the vertical axis through the sliding rods.

2. The salt bath quenching furnace according to claim 1, characterized in that, The circular wave slide has a crest section, a trough section, and a connecting section. The crest section and the trough section extend radially along the circular wave slide. The connecting section is located between the crest section and the trough section. In the radial direction of the annular support frame, the width of the crest section and the trough section are the same, and the width of the connecting section is smaller than the width of the crest section.

3. The salt bath quenching furnace according to claim 1, characterized in that, The upper surface of the actuating plate is provided with an annular baffle, which is arranged around the arc-shaped clearance groove. The annular baffle has a certain height in the vertical direction.

4. The salt bath quenching furnace according to claim 1, characterized in that, The upper surface of each actuating plate is a conical ring, and the inner circumferential surface of the actuating plate is set away from the fixed plate relative to the outer circumferential surface of the actuating plate. The upper surfaces of at least two actuating plates can form a conical surface.

5. The salt bath quenching furnace according to claim 4, characterized in that, The actuating plate and the annular support frame are each provided in three parts. The actuating plates are, from the inside out, a first actuating plate, a second actuating plate, and a third actuating plate. The horizontal cross-section of the first actuating plate is circular, while the horizontal cross-sections of the second and third actuating plates are annular. The outer circumferential surface of the first actuating plate is provided with a first external gear ring, the inner circumferential surface of the second actuating plate is provided with a second internal gear ring, the outer circumferential surface of the second actuating plate is provided with a second external gear ring, and the inner circumferential surface of the third actuating plate is provided with a third internal gear ring. The first external gear ring meshes with the second internal gear ring, and the second external gear ring meshes with the third internal gear ring.

6. The salt bath quenching furnace according to claim 1, characterized in that, The actuating plate has multiple drainage holes evenly distributed on it, which allow molten salt solution to pass through.

7. A salt bath quenching method, employing the salt bath quenching furnace described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Place the bearing steel balls evenly on the circular wave slide of each annular support frame; S2. Control the first drive mechanism to lower at least two annular support frames into the interior of the furnace body and set them staggered in the vertical direction; S3. Control the second drive mechanism to drive at least two actuating plates to rotate synchronously, so that the actuating plates drive the bearing steel balls to roll on the corresponding circular wave slide.

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