Numerical control high-frequency quenching furnace for rack batch heat treatment

Abstract

The application discloses a numerical control high-frequency quenching furnace for rack batch heat treatment, which comprises a furnace body, a lifting column is rotatably arranged in the furnace body, a clamp for clamping a rack is arranged on the lifting column, a plurality of inner frames are arranged on the inner side of the slotted side wall of the furnace body, a straight-toothed spline shaft is arranged through the inner frame, a quenching mechanism for high-frequency quenching of the rack is arranged on the straight-toothed spline shaft, and a driving part is arranged at the lower end of the furnace body for driving the rotation of the clamp and the straight-toothed spline shaft. The application has the advantages of simple structure and reasonable design, realizes the rotation of a rectangular coil around the straight-toothed spline shaft and the meshing with the tooth profile on the rack, and realizes the targeted heating effect of the side wall and the tooth top surface of the tooth, so that the electromagnetic field distribution of each surface of the tooth can be more uniform, the heating depth and the temperature field distribution are more consistent, and the hardness difference of the rack surface at different positions after quenching is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-frequency quenching equipment, in particular to a numerical control high-frequency quenching furnace for batch heat treatment of racks. BACKGROUND

[0002] As a key component in mechanical transmission systems, the surface hardness and wear resistance of racks directly affect the transmission accuracy and service life. High-frequency quenching technology has become the preferred process for rack surface strengthening due to its fast heating speed, small deformation, and low energy consumption. By precisely controlling the heating depth and cooling speed of high-frequency current, a uniform and dense hardened layer can be formed on the rack surface, significantly improving its fatigue resistance and load-carrying capacity, which is of great significance to high-precision transmission fields such as engineering machinery and numerical control machine tools.

[0003] The traditional device has the following disadvantages:

[0004] Currently, rack batch high-frequency quenching is mainly achieved by using numerical control quenching machine tools in combination with induction coils. During operation, the induction coil moves along the rack axis at a fixed interval, locally heats the rack surface through electromagnetic induction, and then sprays a cooling medium to achieve quenching and hardening. However, the existing technology has obvious defects: due to the periodic tooth structure on the rack surface, the electromagnetic field distribution is uneven at the convex tooth top and concave tooth slope during induction heating, resulting in inconsistent heating depth and temperature field distribution. This uneven heating easily causes the tooth top to overheat and the tooth slope to underheat, ultimately leading to large differences in rack surface hardness after quenching, affecting the performance and service life of the product. SUMMARY

[0005] The purpose of the present application is to provide a numerical control high-frequency quenching furnace for batch heat treatment of racks to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present application provides the following technical solution: a numerical control high-frequency quenching furnace for batch heat treatment of racks, comprising a furnace body, a lifting column is rotatably arranged inside the furnace body, a clamp for clamping a rack is arranged on the lifting column, a plurality of inner frames are arranged on the inner side of the slotted side wall of the furnace body, a straight toothed spline shaft is arranged through the inner frame, a quenching mechanism for high-frequency quenching of the rack is arranged on the straight toothed spline shaft, and a driving part is arranged at the lower end of the furnace body for driving the lifting of the clamp and the rotation of the straight toothed spline shaft.

[0007] The quenching mechanism comprises:

[0008] The installation assembly is sleeved on the straight toothed spline shaft, and a transverse plate is arranged at one end of the installation assembly away from the straight toothed spline shaft; two ends of the transverse plate are provided with positioning frames; the straight toothed spline shaft drives the transverse plate and the positioning frames to rotate through the installation assembly; and the transverse plate is controlled in length so that every two groups of the positioning frames adjacent in the radial direction can be alternately arranged.

[0009] The adjusting assembly is arranged in the positioning frame, and the upper and lower ends of the adjusting assembly and the inner side of the positioning frame are provided with connecting rods through the holes; the connecting rods are horizontally connected with rectangular coils; three rectangular coils are arranged between one group of the positioning frames and are used for high-frequency quenching of three surfaces of the tooth and the side wall of the rack; and the two ends of the connecting rods are provided with threads and nuts matched with the threads for positioning of the connecting rods.

[0010] Preferably, the adjusting assembly comprises:

[0011] The slide plate is slidingly connected in the sliding groove at the upper and lower ends of the positioning frame; one end of the slide plate is provided with a first return spring in the sliding groove of the positioning frame; the first return spring always applies a horizontal thrust to the slide plate; and the other end of the slide plate is provided with a first electromagnet group for driving the slide plate to move horizontally.

[0012] The mounting rod is symmetrically connected between the upper and lower slide plates; a positioning seat is arranged in the middle of the mounting rod; lifting seats are slidingly connected to the two ends of the positioning seat on the mounting rod; one end of the lifting seat is slidingly connected to the through hole on the positioning seat through a slide rod; a second return spring is sleeved on the slide rod of the lifting seat; and a second electromagnet group is arranged between the lifting seat and the slide plate.

[0013] The locking assembly is arranged in the sliding groove at the two ends of the positioning frame; and the locking assembly is used for locking the positions of the slide plate and the lifting seat during high-frequency quenching.

[0014] Preferably, the locking assembly comprises:

[0015] The movable plug is arranged in the groove on the end face of the slide plate and matched with the end hole of the mounting rod; a third electromagnet group is arranged in the sliding groove at the two ends of the positioning frame and is used for driving the movable plug to move.

[0016] The locking strip is movably and symmetrically arranged in the through slot on the mounting rod; springs are connected between the two ends of the locking strip and the movable plug; and the third electromagnet group is used for driving the movable plug and the springs to press the locking strip out of the mounting rod.

[0017] Preferably, the mounting assembly comprises:

[0018] The extension frame is slidably connected to the straight-toothed spline shaft through the tooth opening at one end, and an electric telescopic rod is embedded at the end of the extension frame away from the straight-toothed spline shaft, the end of the electric telescopic rod is connected to a docking flap, the docking flap is slidably connected to the sliding groove on the back of the horizontal plate, and a positioning bolt is threadedly connected to the docking flap for positioning the docking flap on the horizontal plate.

[0019] Preferably, each horizontal plate needs two mounting assemblies to be connected to the straight-toothed spline shaft.

[0020] Preferably, the end of the docking flap is also symmetrically provided with a guide rod slidably connected to the end hole of the extension frame.

[0021] Preferably, the straight-toothed spline shaft is provided with a synchronous belt connected to the driving part at the end through the inner frame.

[0022] Preferably, the inner side of the positioning frame is also provided with a distance sensor for judging the position of the rectangular coil.

[0023] Preferably, a maintenance door for protecting the quenching mechanism is provided on the side wall of the furnace body outside the notch and the inner frame.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1. By providing the quenching mechanism, the rectangular coil is rotated around the straight-toothed spline shaft and engaged with the tooth profile on the rack, and follows the movement of the rack to enter the tooth groove, thereby achieving targeted heating of the side wall and tooth top surface of the tooth, making the electromagnetic field distribution of each surface of the tooth more uniform, the heating depth and temperature field distribution more consistent, significantly reducing the hardness difference of the rack surface at different positions after quenching, and improving the use performance and overall service life of the rack.

[0026] 2. By providing the adjusting assembly, the relative positions of the three rectangular coils on each positioning frame can be flexibly adjusted, so that the relative positions of the three rectangular coils can match the three surfaces of the teeth on the rack, ensuring the adaptability of the numerical control quenching furnace to different sizes and shapes of teeth, significantly expanding the application range of the numerical control quenching furnace, and having high practicality.

[0027] 3. By providing the locking assembly, the horizontal positioning of the rectangular coil after position adjustment by the lifting seat is realized, ensuring the position stability of the coil during high-frequency quenching of the rack, avoiding shaking or misalignment during quenching, and thereby affecting the surface quality of the rack.

[0028] 4、The present application is provided with the mounting assembly, realize the flexible setting of the included angle between each group of rectangular coil, horizontal plate and positioning frame, make that the quenching mechanism can be matched with rack of different pitch, adjust the extension amount of each group of rectangular coil relative to straight toothed spline shaft through electric telescopic rod, ensure that the rectangular coil is adapted to rack of different tooth height, further ensure the adaptive ability of the numerical control quenching furnace to different rack. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the overall schematic view of the present application;

[0030] Figure 2 It is the schematic view of the mounting position of the clamp of the present application;

[0031] Figure 3 It is the main view schematic view of the internal structure of the present application;

[0032] Figure 4 It is the top view schematic view of the internal structure of the present application;

[0033] Figure 5 It is the three-dimensional schematic view of the quenching mechanism of the present application;

[0034] Figure 6 It is the first view angle installation schematic view of the rectangular coil of the present application;

[0035] Figure 7 It is the Figure 6 Enlarged view in A of the present application;

[0036] Figure 8 It is the second view angle installation schematic view of the rectangular coil of the present application;

[0037] Figure 9 It is the main view schematic view of the internal structure of the positioning frame of the present application;

[0038] Figure 10 It is the Figure 9 Enlarged view in B of the present application;

[0039] Figure 11 It is the internal structure side view schematic view of the positioning frame and mounting assembly of the present application;

[0040] Figure 12 It is the Figure 11 Enlarged view in C of the present application;

[0041] Figure 13 It is the three-dimensional schematic view of the rack high-frequency quenching of the present application;

[0042] Figure 14 It is the schematic view of the tooth and rectangular coil position distribution in the rack high-frequency quenching process of the present application.

[0043] In the diagram: 1. Furnace body; 2. Lifting column; 3. Clamp; 4. Inner frame; 5. Straight-tooth splined shaft; 501. Synchronous belt; 6. Quenching mechanism; 601. Horizontal plate; 602. Positioning frame; 6021. Distance sensor; 603. Connecting rod; 604. Rectangular coil; 605. Thread; 606. Nut; 7. Drive unit; 8. Mounting assembly; 801. Extension frame; 802. Electric telescopic rod; 803. Connecting plate; 8031, Guide rod; 804, Positioning bolt; 9, Adjustment assembly; 901, Slide plate; 902, First return spring; 903, First electromagnet assembly; 904, Mounting rod; 905, Positioning seat; 906, Lifting seat; 907, Second return spring; 908, Second electromagnet assembly; 10, Locking assembly; 1001, Movable plug; 1002, Third electromagnet assembly; 1003, Locking bar; 1004, Spring plate. Detailed Implementation

[0044] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0045] It should be noted that when an element is referred to as "fixed," "mounted," "connected," or "set" with another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0046] As a further improvement of the present invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0047] Please see Figures 1-14As shown, the present application provides a rack batch heat treatment numerical control high-frequency quenching furnace technical scheme: a rack batch heat treatment numerical control high-frequency quenching furnace, comprising a furnace body 1, a lifting column 2 is rotatably installed in the furnace body 1, a clamp 3 for clamping the rack is installed on the lifting column 2, the rack enters through the window at the top end of the furnace body 1 and is clamped by the clamp 3, the lifting column 2 drives the rack to rise and fall through the clamp 3, the upper end of the furnace body 1 is used for induction heating, the lower end is used for spraying oil cooling, the inner side of the slotted side wall of the furnace body 1 is provided with a plurality of inner frames 4, a straight toothed spline shaft 5 is rotatably connected on the inner frame 4, the straight toothed spline shaft 5 can be removed and installed on the inner frame 4, the straight toothed spline shaft 5 receives external current through the conductive slip ring and outputs power to the corresponding adjusting assembly 9 and the mounting assembly 8. The straight toothed spline shaft 5 is provided with a quenching mechanism 6 for high-frequency quenching of the rack. The inner frame 4 can be 3-9, corresponding to the installation of 3-9 quenching mechanisms 6. The lower end of the furnace body 1 is provided with a driving part 7 for driving the clamp 3 to rise and fall and the rotation of the straight toothed spline shaft 5;

[0048] The quenching mechanism 6 comprises a mounting assembly 8 and an adjusting assembly 9. A plurality of mounting assemblies 8 are sleeved on the straight toothed spline shaft 5, the end of the mounting assembly 8 away from the straight toothed spline shaft 5 is provided with a horizontal plate 601, the two ends of the horizontal plate 601 are symmetrically provided with positioning frames 602, the straight toothed spline shaft 5 drives the horizontal plate 601 and the positioning frames 602 to rotate through the plurality of mounting assemblies 8. The adjusting assembly 9 is installed inside the positioning frame 602, the upper and lower ends of the adjusting assembly 9 and the inner side of the positioning frame 602 are both provided with a connecting rod 603 installed through a hole, the connecting rods 603 are horizontally connected with a rectangular coil 604, three rectangular coils 604 are arranged between a group of positioning frames 602 for high-frequency quenching of three surfaces of the teeth and the side wall of the rack, threads 605 are arranged at the two ends of the connecting rod 603 and nuts 606 matched with the threads 605, the positioning of the connecting rod 603 is realized by clamping and adjusting the two sides of the adjusting assembly 9 through the nuts 606.

[0049] The horizontal plate 601 controls the length so that every two groups of positioning frames 602 radially adjacent can be alternately arranged, when the rectangular coil 604 needs to be installed on the positioning frames 602 with different spacing, rotating the position of the adjusting nut 606 can make it match with the positioning frames 602 with different spacing. That is, the lengths of the two adjacent horizontal plates 601 are inconsistent, when the pitch of the rack is small, more rectangular coils 604 are needed, so more horizontal plates 601 and positioning frames 602 are needed to install, at this time, the positioning frames 602 at the two ends of the long horizontal plate 601 can be sleeved on the two ends of the short horizontal plate 601 to reduce the demand for installation space, improve the density of the coil, so that the quenching mechanism 6 can match with the racks with different pitches.

[0050] Before the rack is high-frequency quenched by using the high-frequency quenching furnace, the number and the included angle of the installation assemblies 8 are determined according to the pitch of the rack, then the distance between each group of the horizontal plates 601, the positioning frames 602 and the rectangular coils 604 above them and the shaft center of the straight toothed spline shaft 5 is adjusted by the installation assemblies 8 according to the tooth height of the rack, and the position of each rectangular coil 604 is precisely adjusted by the adjusting assemblies 9 according to the tooth height and the inclination angle of the rack.

[0051] Subsequently, several racks are sent into the furnace body 1 through the window at the top end and clamped by the clamps 3, the high-frequency quenching furnace control system controls all the rectangular coils 604 on the corresponding quenching mechanism 6 to pass high-frequency alternating current, and the rectangular coils 604 on the straight toothed spline shaft 5 are driven to rotate along with the descending of the rack under the driving of the driving part 7. Figure 14 As shown in the figure, when the teeth on the rack pass from one side of the quenching mechanism 6, the three energized rectangular coils 604 respectively approach to the closest point with the tooth top and the tooth flank of the corresponding tooth, and then separate, the high-frequency alternating current makes the tooth surface generate an induction current of the same frequency to achieve rapid heating. When the tooth and the straight toothed spline shaft 5 are in the same horizontal plane, two of the three rectangular coils 604 are located in the tooth groove, and the three rectangular coils 604 are consistent with the distance of the three surfaces of the tooth and closest to each other, at this time, the three surfaces of the tooth reach the highest temperature set, and the heating time is controlled by the driving rate of the clamp 3 and the rotating speed of the straight toothed spline shaft 5 controlled by the driving part 7 of the quenching furnace control system.

[0052] Through the quenching mechanism 6, the rectangular coils 604 are realized to rotate around the straight toothed spline shaft 5 and mesh with the tooth profile on the rack, and follow the movement of the rack to enter the tooth groove, so as to achieve the effect of targeted heating of the side wall and the tooth top surface of the tooth, so that the electromagnetic field distribution of each surface of the tooth can be more uniform, the heating depth and the temperature field distribution are more consistent, and the hardness difference of the rack surface at different positions after quenching is significantly reduced, and the use performance and the overall service life of the rack are improved.

[0053] The adjusting assembly 9 comprises a sliding plate 901, a mounting rod 904 and a locking assembly 10. The sliding plate 901 is slidingly connected in the sliding grooves at the upper and lower ends of the positioning frame 602, one end of the sliding plate 901 is provided with a first return spring 902 in the sliding groove of the positioning frame 602, the first return spring 902 always applies a horizontal pushing force to the sliding plate 901, the other end of the sliding plate 901 is provided with a first electromagnet group 903 for driving the sliding plate 901 to move horizontally, the first electromagnet group 903 is composed of a permanent magnet mounted at the end of the sliding plate 901 and an electromagnet mounted on the sliding groove of the positioning frame 602, the quenching furnace control system adjusts the direction and size of the current passing through the electromagnet to adjust the direction and size of the force of the permanent magnet, thereby overcoming the elastic force of the first return spring 902 to move the sliding plate 901 to the specified position of the sliding groove, that is, to adjust the horizontal position of the two rectangular coils 604 outside the positioning frame 602.

[0054] The mounting rod 904 is symmetrically and fixedly connected between the upper and lower sliding plates 901 and moves horizontally with the two sliding plates 901, the mounting rod 904 is centrally and fixedly provided with a positioning seat 905, the mounting rod 904 is slidingly connected with lifting seats 906 at both ends of the positioning seat 905, one end of the lifting seat 906 is slidingly connected with a through hole on the positioning seat 905 through a slide rod, the slide rod can effectively control the lifting path of the lifting seat 906, a second return spring 907 for applying a longitudinal pushing force is sleeved on the slide rod of the lifting seat 906, a second electromagnet group 908 is mounted between the lifting seat 906 and the sliding plate 901, the second electromagnet group 908 is composed of an electromagnet mounted on the sliding plate 901 and a permanent magnet mounted at the end of the lifting seat 906, the quenching furnace control system adjusts the direction and size of the current passing through the electromagnet to adjust the direction (attractive force or repulsive force) and size of the force of the permanent magnet, thereby overcoming the elastic force of the second return spring 907 to lift the lifting seat 906 to the specified position, that is, to adjust the longitudinal position of the two rectangular coils 604 outside the positioning frame 602.

[0055] The locking assembly 10 is mounted in the sliding grooves at both ends of the positioning frame 602, and the locking assembly 10 is used to lock the positions of the sliding plate 901 and the lifting seat 906 during high-frequency quenching.

[0056] A distance sensor 6021 is also installed on the inner side of the positioning frame 602. The distance sensor 6021 determines the horizontal and vertical position of the rectangular coil 604 within the positioning frame 602 by detecting the position of the lifting seat 906. When adjusting the position of the two rectangular coils 604 on the outer side of the positioning frame 602, the distance sensor 6021 feeds back the horizontal and vertical positions of the lifting seat 906 to the quenching furnace control system in real time. Then, according to the above control logic, the magnitude and direction of the current passing through the first electromagnet group 903 and the second electromagnet group 908 are precisely adjusted until the rectangular coil 604 on the outer side of the positioning frame 602 moves to the designated position.

[0057] Before installing the rack to be quenched, the operator should input the tooth height and tilt angle data of the rack teeth into the system. Then, the quenching furnace control system controls the current of a specified magnitude and direction to be supplied to the electromagnets on the first electromagnet group 903 and the second electromagnet group 908. This causes the slide plate 901 to overcome the elastic force of the first return spring 902 and drive the lifting seat 906 to move horizontally. The lifting seat 906 overcomes the elastic force of the second return spring 907 and moves vertically on its own. During the movement, the distance sensor 6021 provides real-time feedback on the position of the lifting seat 906, which allows the first electromagnet group 903 and the second electromagnet group 908 to correct the current magnitude until the lifting seat 906 moves to the system set position. At this time, the position adjustment of the rectangular coil 604 is completed, and the positions of the three rectangular coils 604 located inside and outside the positioning frame 602 match the three surfaces of the rack teeth.

[0058] By adjusting component 9, the relative positions of the three rectangular coils 604 on each positioning frame 602 can be flexibly adjusted, so that the relative positions of the three rectangular coils 604 can match the three surfaces of the teeth on the rack. This ensures the adaptability of the CNC quenching furnace to teeth of different sizes and shapes, significantly expands the application range of the CNC quenching furnace, and has high practicality.

[0059] The locking assembly 10 includes a movable plug 1001 and a locking strip 1003. The movable plug 1001 is fitted into a groove on the end face of the slide plate 901 and matches the end hole of the mounting rod 904. Figure 12It is known that the end of the mounting rod 904 is fixedly connected to the slide plate 901, and the movable plug 1001 can move up and down. The movable plug 1001 and the sliding grooves at both ends of the positioning frame 602 are equipped with a third electromagnet assembly 1002 for driving the movable plug 1001 to move. The third electromagnet assembly 1002 consists of electromagnets embedded in the two ends of the positioning frame 602 and permanent magnets installed at the end of the movable plug 1001. The locking strip 1003 is symmetrically and movably installed in the through groove on the mounting rod 904. Since the mounting rod 904 has a through groove for installing the locking strip 1003, the connection part between the positioning seat 905 and the mounting rod 904 is located on both sides of the through groove, and the positioning seat 905 has a slot at the through groove to facilitate the locking strip 1003 to pop out from the mounting rod 904. Spring plates 1004 are connected between the two ends of the locking bar 1003 and the movable plug 1001. The third electromagnet group 1002 is used to drive the movable plug 1001 and the spring plates 1004 to press the locking bar 1003 out of the mounting rod 904.

[0060] When the position of the lifting seat 906 needs to be adjusted, the quenching furnace control system controls the electromagnets of the third electromagnet group 1002 to be energized, which attracts the permanent magnet at the end of the movable plug 1001. The movable plug 1001 pulls the locking strip 1003 into the through groove on the mounting rod 904 via the spring plate 1004. When the lifting seat 906 is adjusted to the required locking position, the quenching furnace control system controls the electromagnets of the third electromagnet group 1002 to change the direction of the current, generating a repulsive force on the permanent magnet. This, in turn, compresses the spring plate 1004 via the movable plug 1001, pushing the locking strip 1003 out of the through groove on the mounting rod 904, so that the locking strip 1003 presses against the inner wall of the holes on both sides of the lifting seat 906 to complete the positioning.

[0061] The locking component 10 enables horizontal positioning of the rectangular coil 604 after the lifting seat 906 drives it to complete the position adjustment. This ensures the positional stability of the coil during the high-frequency quenching of the rack and prevents shaking or misalignment during the quenching process, which would affect the surface quality of the rack.

[0062] Mounting assembly 8 includes an extension frame 801. One end of the extension frame 801 is slidably connected to the straight-tooth spline shaft 5 via teeth. An electric telescopic rod 802 is embedded in the end of the extension frame 801 away from the straight-tooth spline shaft 5. The end of the electric telescopic rod 802 is connected to a mating plate 803. The mating plate 803 is slidably connected to a groove on the back of the horizontal plate 601. A positioning bolt 804 is also threaded onto the mating plate 803 for positioning the mating plate 803 on the horizontal plate 601.

[0063] When it is necessary to adjust the number of groups of rectangular coils 604, the operator can first remove the straight spline shaft 5 from the inner frame 4, then slide off all the sliding grooves of the mating plates 803 and the horizontal plates 601, and then, according to the set angle, put several extension frames 801 and their end mating plates 803 onto the straight spline shaft 5 in sequence, and adjust their respective included angles. Then, put the horizontal plates 601 onto the mating plates 803 through the sliding groove on the back, and finally tighten the positioning bolts 804 to lock the relative positions of the mating plates 803 and the horizontal plates 601. Each horizontal plate 601 needs two sets of mounting components 8 to be connected and fixed to the straight spline shaft 5. After the above adjustment is completed, put the straight spline shaft 5 back into the inner frame 4.

[0064] Each extension frame 801 has its angle with the others on the spur spline shaft 5 adjusted by toothed gears. The closer the teeth are on the rack on the spur spline shaft 5 and the inner ring of the extension frame 801, the higher the adjustable range and precision. This allows for precise adjustment of the angle between each set of horizontal plates 601, positioning frames 602, and the rectangular coil 604 above them, achieving a match with racks to be quenched for various tooth pitches. Figure 5 As shown, the teeth of the inner ring of the extension bracket 801 are slidably connected to the rack of the straight spline shaft 5. The operator can adjust its position on the straight spline shaft 5 as needed so that each extension bracket 801 has an installation position. This ensures that the extension bracket 801 can be effectively fixed when the pitch of the rack to be quenched is small and multiple sets of rectangular coils 604 are needed.

[0065] Before the rack undergoes high-frequency quenching, the quenching furnace control system will adjust the extension and retraction of the electric telescopic rod 802 according to the tooth height. The extension and retraction of the electric telescopic rod 802 will drive the horizontal plate 601, the positioning frame 602 and the rectangular coil 604 inside it to move as a whole. This action can adjust the distance from the tooth tip of the rack to the innermost rectangular coil 604 during high-frequency quenching.

[0066] By installing component 8, the included angle between each group of rectangular coils 604, horizontal plate 601 and positioning frame 602 can be flexibly set, so that the quenching mechanism 6 can be matched with racks with different tooth pitches. At the same time, the extension of each group of rectangular coils 604 relative to the straight tooth spline shaft 5 can be adjusted by electric telescopic rod 802 to ensure that the rectangular coils 604 are adapted to racks with different tooth heights, further ensuring the adaptability of the CNC quenching furnace to different rack conditions.

[0067] The end of the docking flap 803 is also symmetrically equipped with guide rods 8031 ​​that are slidably connected to the end holes of the extension frame 801. When the electric telescopic rod 802 extends or retracts, the guide rods 8031 ​​move synchronously to ensure the stability of the docking flap 803 relative to the extension frame 801.

[0068] The straight spline shaft 5 passes through the inner frame 4 and is connected to the drive unit 7 by a timing belt 501 at its end. The drive unit 7 drives the straight spline shaft 5 through the timing belt 501, which in turn drives the rectangular coil 604 on the quenching mechanism 6 to rotate following the movement of the rack. The timing belt 501 also makes it easy for workers to remove and reinstall the straight spline shaft 5.

[0069] On the side wall of the furnace body 1, an inspection door for protecting the quenching mechanism 6 is movably installed on the outside of the slot and the inner frame 4. The inspection door can be installed on the outside of each inner frame 4 to protect the quenching mechanism 6. If it is not installed, it will not affect the quenching effect of the rack.

[0070] Working Principle: Before using the high-frequency quenching furnace to perform high-frequency quenching on the rack, the operator can first remove the spur spline shaft 5 from the inner frame 4, then separate all the mating plates 803 and the horizontal plate 601. Next, according to the set angle, several extension frames 801 and their end mating plates 803 are sequentially fitted onto the spur spline shaft 5, and their respective included angles are adjusted. Then, the horizontal plate 601 is put back onto the mating plates 803, and finally the positioning bolts 804 are tightened to lock the relative positions of the mating plates 803 and the horizontal plate 601. The spur spline shaft 5 is then installed back into the inner frame 4. Subsequently, the distance from the tooth tip of the rack to the innermost rectangular coil 604 is adjusted by the electric telescopic rod 802. After the above adjustment is completed, the quenching furnace control system starts the first electromagnet group 903 and the second electromagnet group 908 according to the data input by the operator. By adjusting the position of the lifting seat 906, the position of the two outer rectangular coils 604 is adjusted so that they can match the contour and size of the target rack teeth. Finally, the locking bar 1003 is driven by the third electromagnet group 1002 to lock and position the lifting seat 906, at which point the batch high-frequency quenching of the rack can begin. During the high-frequency quenching process, each group of rectangular coils 604 rotates around the straight tooth spline shaft 5, and can follow the movement of the rack to penetrate into the tooth groove, thereby providing targeted and balanced heating to the side walls and tooth tip surfaces of the teeth.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0072] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A CNC high-frequency quenching furnace for batch heat treatment of racks, comprising a furnace body (1), wherein a lifting column (2) is rotatably arranged inside the furnace body (1), and a clamp (3) for clamping racks is provided on the lifting column (2), characterized in that: The inner side of the slotted side wall of the furnace body (1) is provided with several inner frames (4), and a straight tooth spline shaft (5) is provided through the inner frame (4). A quenching mechanism (6) for high-frequency quenching of the rack is provided on the straight tooth spline shaft (5). A drive unit (7) is provided at the lower end of the furnace body (1) for driving the clamp (3) to lift and the straight tooth spline shaft (5) to rotate. The quenching mechanism (6) includes: Mounting components (8) are mounted on the spur spline shaft (5). A horizontal plate (601) is provided at one end of the mounting components (8) away from the spur spline shaft (5). Positioning frames (602) are provided at both ends of the horizontal plate (601). The spur spline shaft (5) drives the horizontal plate (601) and the positioning frames (602) to rotate through the mounting components (8). The horizontal plate (601) is controlled in length so that every two radially adjacent sets of positioning frames (602) can be arranged alternately. An adjustment component (9) is disposed inside the positioning frame (602). The upper and lower ends of the adjustment component (9) and the inner side of the positioning frame (602) are provided with connecting rods (603) through holes. Rectangular coils (604) are horizontally connected between the connecting rods (603). Three rectangular coils (604) are provided between a group of positioning frames (602) for high-frequency quenching of the three surfaces of the teeth and the sidewall of the rack. The two ends of the connecting rods (603) are provided with threads (605) and nuts (606) that match the threads (605) for positioning the connecting rods (603). The adjustment component (9) includes: A sliding plate (901) is slidably connected in the grooves at the upper and lower ends of the positioning frame (602). One end of the sliding plate (901) is provided with a first return spring (902) in the groove of the positioning frame (602). The first return spring (902) always applies a horizontal thrust to the sliding plate (901). The other end of the sliding plate (901) is provided with a first electromagnet assembly (903) for driving the sliding plate (901) to move horizontally in the groove of the positioning frame (602). Mounting rod (904) is symmetrically connected between the upper and lower sliding plates (901). A positioning seat (905) is centrally located on the mounting rod (904). Lifting seats (906) are slidably connected to both ends of the positioning seat (905) on the mounting rod (904). One end of the lifting seat (906) is slidably connected to the through hole on the positioning seat (905) through a sliding rod. A second return spring (907) is sleeved on the sliding rod of the lifting seat (906). A second electromagnet assembly (908) is provided between the lifting seat (906) and the sliding plate (901). Locking assembly (10) is disposed in the grooves at both ends of the positioning frame (602). The locking assembly (10) is used to lock the position of the slide plate (901) and the lifting seat (906) during high frequency quenching.

2. The CNC high-frequency quenching furnace for batch heat treatment of racks according to claim 1, characterized in that: The locking assembly (10) includes: The movable plug (1001) is located in a groove on the end face of the slide plate (901) and matches the end hole of the mounting rod (904). The movable plug (1001) and the sliding grooves at both ends of the positioning frame (602) are provided with a third electromagnet group (1002) for driving the movable plug (1001) to move. A locking bar (1003) is symmetrically and movably arranged in a through groove on the mounting rod (904). Spring plates (1004) are connected between the two ends of the locking bar (1003) and the movable plug (1001). The third electromagnet group (1002) is used to drive the movable plug (1001) and the spring plates (1004) to press the locking bar (1003) out from the mounting rod (904).

3. The CNC high-frequency quenching furnace for batch heat treatment of racks according to claim 1, characterized in that: The installation component (8) includes: An extension frame (801) is provided. One end of the extension frame (801) is slidably connected to the straight spline shaft (5) by means of teeth. An electric telescopic rod (802) is embedded in the end of the extension frame (801) away from the straight spline shaft (5). A docking plate (803) is connected to the end of the electric telescopic rod (802). The docking plate (803) is slidably connected to the groove on the back of the horizontal plate (601). A positioning bolt (804) is also threaded on the docking plate (803) for positioning the docking plate (803) on the horizontal plate (601).

4. The CNC high-frequency quenching furnace for batch heat treatment of racks according to claim 3, characterized in that: Each of the said cross plates (601) requires two sets of mounting components (8) to be connected to the straight-tooth spline shaft (5).

5. The CNC high-frequency quenching furnace for batch heat treatment of racks according to claim 3, characterized in that: The end of the docking plate (803) is also symmetrically provided with guide rods (8031) that are slidably connected to the end holes of the extension frame (801).

6. The CNC high-frequency quenching furnace for batch heat treatment of racks according to claim 1, characterized in that: The straight-tooth spline shaft (5) passes through the inner frame (4) and is connected to the drive unit (7) by a timing belt (501) at its end.

7. The CNC high-frequency quenching furnace for batch heat treatment of racks according to claim 1, characterized in that: The inner side of the positioning frame (602) is also provided with a distance sensor (6021) for determining the position of the rectangular coil (604).

8. The CNC high-frequency quenching furnace for batch heat treatment of racks according to claim 1, characterized in that: The furnace body (1) has an inspection door on the side wall located outside the slot and the inner frame (4) for protecting the quenching mechanism (6).

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