Gear machining heat treatment device

Abstract

The utility model provides a gear processing heat treatment device relates to gear processing technical field, the utility model discloses an electromagnetic heat treatment machine, the inner wall of electromagnetic heat treatment machine is provided with electromagnetic heating ring, the inner wall sliding installation of electromagnetic heat treatment machine has the sliding frame, the utility model discloses a limiting device can be placed on several extruding blocks with gear, through the self weight to extruding block pressurization and drive the hydraulic oil in recessed groove inside to enter the flow guide hole and hydraulic oil cavity, then through piston abuts the rod and drives several limit frame in the inner wall of cylinder and slides outward, the inner wall of its gear is centrally limited, makes it can be fast and align the inner wall of electromagnetic heating ring, avoids the deviation, improves heat treatment processing effect and quality, reduces production cost and unqualified product rate, adjusts through the self gravity simultaneously, can carry out the central support limit to the gear of different size diameter, improves the applicability of electromagnetic heat treatment machine.

Description

Technical Field

[0001] This utility model relates to the field of gear processing technology, and in particular to a gear processing heat treatment device. Background Technology

[0002] Gear heat treatment equipment is a specialized device used for heat treatment of gears. Its purpose is to control parameters such as temperature and time to make the gear material reach the predetermined hardness, toughness and other mechanical properties. This equipment is often used in the quenching, tempering, normalizing and annealing processes of gears to ensure that the gears have high wear resistance and load-bearing capacity during use.

[0003] Electromagnetic heat treatment machines utilize the principle of electromagnetic induction heating. A high-frequency current generates an alternating magnetic field on an electromagnetic heating coil, rapidly heating the surface of gears placed inside to the desired temperature. This alters the metallographic structure, improving hardness and wear resistance. The heating process is primarily concentrated on the gear surface, ensuring minimal impact on the internal structure. After heating, an electric telescopic rod drives a slide carriage downwards within the machine to the corresponding position, lowering the heat-treated gear into the coolant for rapid or moderate cooling to further optimize the hardening effect. This process is crucial for the current mainstream gear... Electromagnetic heat treatment machines typically use fixed supports to hold gears. These fixed-size supports can only accommodate gears of a single specification. When processing gears of different diameters and thicknesses, the machine must be stopped to replace the support components of the corresponding specifications. This not only increases tooling costs but also significantly extends process changeover time, reducing production efficiency. Furthermore, when manually placing gears, it is difficult to accurately align the gears with the inner wall of the electromagnetic heating coil, which can easily lead to gear misalignment. Misalignment can cause uneven heating of different parts of the gear, resulting in quality problems such as deviations in tooth surface hardness and excessive deformation. Subsequent correction processes are required, further increasing production costs and the rate of defective products. Utility Model Content

[0004] The technical problem this invention aims to solve is that current mainstream gear electromagnetic heat treatment machines mostly use fixed brackets to place gears. These fixed-size brackets can only match gears of a single specification. When processing gears of different diameters and thicknesses, the machine must be stopped to replace the corresponding support components. This not only increases tooling costs but also significantly extends process changeover time, reducing production efficiency. Furthermore, when manually placing gears, it is difficult to accurately align the gears with the inner wall of the electromagnetic heating coil, which can easily lead to gear misalignment. Misalignment can cause uneven heating of different parts of the gear, resulting in quality problems such as deviations in tooth surface hardness and excessive deformation. Subsequent correction processes are required, further increasing production costs and the rate of defective products.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a gear processing heat treatment device, including an electromagnetic heat treatment machine. The inner wall of the electromagnetic heat treatment machine is provided with an electromagnetic heating coil. A slide is slidably installed on one side of the inner wall of the electromagnetic heat treatment machine. An electric telescopic rod is fixedly installed on one side of the slide. One end of the electric telescopic rod is fixedly installed on one side of the inner wall of the electromagnetic heat treatment machine. A limiting device is provided on one side of the slide. The limiting device can place the gear on several extrusion blocks. By its own weight, it presses the extrusion blocks and pushes the hydraulic oil inside the groove into the guide hole and the hydraulic oil chamber. Then, by the piston abutment rod, it pushes several limiting frames to slide outward in the inner wall of the cylinder, thus centering and limiting the inner wall of the gear.

[0006] Preferably, the limiting device includes a plurality of extrusion blocks, a plurality of grooves formed on one side of the slide, wherein the extrusion blocks are slidably mounted in the inner wall of the grooves, a hydraulic oil chamber is formed inside the slide, and a plurality of guide holes are formed inside the slide, wherein the inner walls of the guide holes communicate with the inner walls of the grooves and the inner walls of the hydraulic oil chamber; a plurality of first springs, wherein the two ends of the first springs are respectively fixedly mounted on one side of the extrusion blocks and one side of the inner wall of the grooves; a cylinder, wherein one side of the cylinder is fixedly mounted on one side of the slide; and a piston abutment rod, wherein the piston... One end of the abutment rod is slidably installed in the inner wall of the hydraulic oil chamber, while the other end extends through one side of the inner wall of the hydraulic oil chamber and into the inner wall of the cylinder; a second spring, wherein the inner wall of the second spring is sleeved on the outer surface of the piston abutment rod, and both ends are respectively fixedly installed on one side of the piston abutment rod and one side of the inner wall of the hydraulic oil chamber; a plurality of limit frames, wherein one end of the limit frame is installed through the inner wall of the cylinder, and one side abuts against the outer surface of one end of the piston abutment rod; a plurality of third springs, wherein both ends of the third spring are respectively fixedly installed on one side of the limit frame and the outer surface of the cylinder.

[0007] The effect achieved by the above components is as follows: When the gear is heat-treated using an electromagnetic heat treatment machine, the inner wall of the gear is fitted onto the outer surface of several limiting brackets on the cylinder. One side of the gear then abuts against one side of several extrusion blocks. Under its own weight, the extrusion blocks slide downwards within the inner wall of the groove, causing the first spring to contract. This forces the hydraulic oil in the groove into the guide hole, and then into the hydraulic oil chamber. Because there is a certain gap between the piston rod penetrating the hydraulic oil chamber and the inner wall of the chamber, they are not tightly connected. Therefore, the piston rod can be pushed upwards, causing the second spring on one side to contract. This pushes several limiting brackets outwards within the inner wall of the cylinder, stretching the third spring on one side of the limiting brackets. One side of each limiting bracket abuts against and supports the inner wall of the gear, centering and limiting it. This allows the gear to quickly align with the inner wall of the electromagnetic heating coil, preventing misalignment and improving performance. The high-efficiency heat treatment process improves processing quality, reduces production costs and defect rates. Simultaneously, by adjusting its own gravity, it can provide centered support and limit the movement of gears of different diameters, enhancing the applicability of the electromagnetic heat treatment machine. During heat treatment, the electric telescopic rod is activated to slide the carriage and the gear supported by the limit upwards to a certain position. The gear is then inserted into the electromagnetic heating coil. The electromagnetic heat treatment machine is then activated, utilizing the principle of electromagnetic induction heating. A high-frequency current generates an alternating magnetic field on the electromagnetic heating coil, rapidly heating the surface of the gear placed inside to the required temperature. This alters the metallographic structure, improving hardness and wear resistance. The heating process is primarily concentrated on the gear surface, ensuring that the internal structure is not excessively affected. After heating, the electric telescopic rod is driven to slide the carriage downwards inside the electromagnetic heat treatment machine to the corresponding position, causing the heat-treated gear to descend into the coolant inside the machine for rapid or moderate cooling to further optimize the hardening effect.

[0008] Preferably, a plurality of protrusions are fixedly installed on one side of the limiting frame, wherein the protrusions are located on the side of the limiting frame away from the third spring.

[0009] The effect achieved by the above components is that by setting the protrusion, the contact friction on one side of the limiting frame can be increased, so that when it supports and centers the inner wall of the gear, one side makes more firm contact with the inner wall of the gear, and the gear is less likely to slip.

[0010] Preferably, a limiting block is fixedly installed on one side of one end of the limiting frame, and the limiting block is fixedly installed at an angle on one side of the limiting frame.

[0011] The effect achieved by the above components is that by setting the limiting block, the distance between one end of several limiting frames can be reduced, making it easier for the gear to be sleeved on the outer surface of several limiting frames and convenient for placement.

[0012] Preferably, the limiting device further includes a filter screen, wherein the outer surface of the filter screen is fixedly installed in the inner wall of the cylinder.

[0013] The effect achieved by the above components is as follows: by setting up a filter screen, one end of the piston abutment rod and one end of several limit brackets can be covered in the inner wall of the cylinder, so that dust and impurities from the outside are not easy to enter the inside of the cylinder, avoiding blockage and affecting the push. At the same time, it does not prevent air from entering between the side of the piston abutment rod and the side of the hydraulic oil chamber away from the guide hole, so that the piston abutment rod can slide back and forth during adjustment.

[0014] Preferably, a plurality of circular rollers are rotatably mounted on one side of the limiting frame, wherein the plurality of circular rollers are arranged at equal intervals.

[0015] The effect achieved by the above components is that by setting the roller, the contact friction between the outer surface of one end of the piston abutment rod and the limit frame can be reduced, making it easier to push, reducing wear between the two and improving service life.

[0016] Preferably, the limiting device further includes a limiting telescopic rod, wherein the outer surface of the limiting telescopic rod is inserted into the inner wall of the first spring, and both ends are respectively fixedly installed on one side of the extrusion block and one side of the inner wall of the groove.

[0017] The effect achieved by the above components is that by setting the limiting telescopic rod, the inner wall of the first spring can be supported and reinforced, making it less prone to damage during use, facilitating the reset of the extrusion block in the later stage, and improving its service life.

[0018] The beneficial effects of this utility model are:

[0019] By setting a limiting device, when using an electromagnetic heat treatment machine to heat treat gears, the inner wall of the gear is fitted onto the outer surface of several limiting frames on a cylinder. Then, one side of the gear abuts against one side of several extrusion blocks. Under its own weight, the extrusion blocks slide downwards within the inner wall of the groove, causing the first spring to contract. This forces the hydraulic oil in the groove into the guide hole, and then into the hydraulic oil chamber. Because there is a certain gap between the part of the piston rod that penetrates the hydraulic oil chamber and the inner wall of the hydraulic oil chamber, it is not tightly connected, thus allowing it to be pushed... The moving piston abuts the rod upward, causing the second spring on one side to contract. Then, one end pushes several limiting brackets to slide outward in the inner wall of the cylinder, causing the third spring on one side of the limiting brackets to be stretched open. One side of the several limiting brackets abuts and supports the inner wall of the gear, centering and limiting it so that it can quickly align with the inner wall of the electromagnetic heating coil, avoiding deviation, improving the heat treatment effect and quality, reducing production costs and defect rate. At the same time, by adjusting its own gravity, it can center and limit gears of different diameters, improving the applicability of the electromagnetic heat treatment machine. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a three-dimensional structural diagram of the electromagnetic heat treatment machine of this utility model;

[0022] Figure 3 This is a three-dimensional structural diagram of the carriage of this utility model;

[0023] Figure 4 for Figure 3 A three-dimensional schematic diagram of a local structure.

[0024] Legend: 1. Electromagnetic heat treatment machine; 2. Limiting device; 3. Slide; 4. Electric telescopic rod; 5. Electromagnetic heating coil; 21. Groove; 22. Extrusion block; 23. First spring; 24. Hydraulic oil chamber; 25. Guide hole; 26. Cylinder; 27. Piston abutment rod; 28. Second spring; 29. ​​Limiting frame; 210. Third spring; 211. Protrusion; 212. Limiting block; 213. Filter screen; 214. Circular roller; 215. Limiting telescopic rod. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 utility model and are not intended to limit the present utility model.

[0026] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0028] In this embodiment:

[0029] Figure 1-4The gear processing heat treatment apparatus shown includes an electromagnetic heat treatment machine 1. An electromagnetic heating coil 5 is installed on the inner wall of the electromagnetic heat treatment machine 1. A slide 3 is slidably installed on one side of the inner wall of the electromagnetic heat treatment machine 1. An electric telescopic rod 4 is fixedly installed on one side of the slide 3, with one end of the electric telescopic rod 4 fixedly installed on one side of the inner wall of the electromagnetic heat treatment machine 1. A limiting device 2 is provided on one side of the slide 3. The limiting device 2 can place the gear on several pressing blocks 22. The gear's own weight presses and pushes the hydraulic oil inside the groove 21 into the guide hole 25 and the hydraulic oil chamber 24. Then, a piston abutment rod 27 pushes several limiting frames 29 to slide outwards within the inner wall of the cylinder 26, thus centering and limiting the gear's inner wall. It should be noted that the electromagnetic heat treatment machine 1 is a mature technology and equipment in the prior art; its internal structure, connection method, and principle will not be elaborated further.

[0030] Figure 1-4The limiting device 2 shown includes several extrusion blocks 22, several grooves 21 on one side of the slide 3, wherein the extrusion blocks 22 are slidably installed in the inner wall of the grooves 21, a hydraulic oil chamber 24 is provided inside the slide 3, and several guide holes 25 are provided inside the slide 3, wherein the inner wall of the several guide holes 25 connects the interior of the several grooves 21 with the inner wall of the hydraulic oil chamber 24; several first springs 23, wherein the two ends of the first springs 23 are respectively fixedly installed on one side of the extrusion blocks 22 and one side of the inner wall of the grooves 21; a cylinder 26, wherein one side of the cylinder 26 is fixedly installed on one side of the slide 3; and a piston abutment rod 27, wherein the piston abutment rod 27 is fixedly installed on one side of the slide 3. One end of the piston rod 27 is slidably installed in the inner wall of the hydraulic oil chamber 24, while the other end extends through one side of the inner wall of the hydraulic oil chamber 24 and into the inner wall of the cylinder 26; a second spring 28, wherein the inner wall of the second spring 28 is sleeved on the outer surface of the piston abutment rod 27, and both ends are fixedly installed on one side of the piston abutment rod 27 and one side of the inner wall of the hydraulic oil chamber 24, respectively; a plurality of limit frames 29, wherein one end of the limit frame 29 is installed through the inner wall of the cylinder 26, and one side abuts against the outer surface of one end of the piston abutment rod 27; a plurality of third springs 210, wherein both ends of the third spring 210 are fixedly installed on one side of the limit frame 29 and the outer surface of the cylinder 26, respectively.When using the electromagnetic heat treatment machine 1 to heat treat the gear, the inner wall of the gear is fitted onto the outer surface of several limiting brackets 29 on the cylinder 26. One side of the gear then abuts against one side of several extrusion blocks 22. Under its own weight, the extrusion blocks 22 slide downwards within the inner wall of the groove 21, causing the first spring 23 to contract. This forces the hydraulic oil in the groove 21 into the guide hole 25, and then into the hydraulic oil chamber 24. Because there is a gap between the piston abutting rod 27, which penetrates the hydraulic oil chamber 24, and the inner wall of the hydraulic oil chamber 24, the piston abutting rod 27 can be pushed upwards. This causes the second spring 28 on one side to contract, pushing one end of the limiting brackets 29 outwards within the inner wall of the cylinder 26. This stretches the third spring 210 on one side of the limiting brackets 29. One side of each limiting bracket 29 abuts against and supports the inner wall of the gear, centrally supporting and limiting it, allowing it to quickly align with the electromagnetic heating coil 5. The inner wall of the electromagnetic heat treatment machine 1 is designed to prevent displacement, improve the heat treatment effect and quality, reduce production costs and defect rate, and allow gears of different diameters to be centered and supported by its own gravity, thus improving the applicability of the electromagnetic heat treatment machine 1. During heat treatment, the electric telescopic rod 4 is activated to drive the slide 3 and the gear supported by the limit to slide upward to a certain position, inserting the gear into the interior of the electromagnetic heating coil 5. Then, the electromagnetic heat treatment machine 1 is activated and uses the principle of electromagnetic induction heating to generate an alternating magnetic field on the electromagnetic heating coil 5 through high-frequency current to raise the temperature. The surface of the gear placed inside is then rapidly heated to the required temperature, thereby changing its metallographic structure and improving its hardness and wear resistance. The heating process is mainly concentrated on the surface of the gear to ensure that the internal structure is not affected too much. After heating, the electric telescopic rod 4 is driven to drive the slide 3 to slide downward to the corresponding position inside the electromagnetic heat treatment machine 1, causing the heat-treated gear to descend into the coolant inside the electromagnetic heat treatment machine 1 for rapid or moderate cooling to further optimize the hardening effect.

[0031] Figure 1-4 Several protrusions 211 are fixedly installed on one side of the limiting frame 29 shown, wherein the protrusions 211 are located on the side of the limiting frame 29 away from the third spring 210. By setting the protrusions 211, the contact friction on one side of the limiting frame 29 can be increased, so that when it supports and centers the inner wall of the gear, the contact between one side and the inner wall of the gear is more firm, and the gear is less likely to slip.

[0032] Figure 1-4A limiting block 212 is fixedly installed on one side of one end of the limiting frame 29 shown. The limiting block 212 is fixedly installed at an angle on one side of the limiting frame 29. By setting the limiting block 212, the distance between one end of several limiting frames 29 can be reduced, making it easier for the gear to be sleeved on the outer surface of several limiting frames 29 and facilitating placement. The limiting device 2 also includes a filter screen 213, the outer surface of which is fixedly installed in the inner wall of the cylinder 26. By setting the filter screen 213, one end of the piston abutment rod 27 and one end of several limiting frames 29 can be covered in the inner wall of the cylinder 26, making it difficult for dust and impurities from the outside to enter the inside of the cylinder 26, avoiding blockage and affecting the pushing, while not hindering the air from entering between one side of the piston abutment rod 27 and the side of the hydraulic oil chamber 24 away from the guide hole 25, so that the piston abutment rod 27 can slide back and forth during adjustment.

[0033] Figure 1-4 A plurality of circular rollers 214 are rotatably mounted on one side of the limiting frame 29, and the circular rollers 214 are arranged at equal intervals. By setting the circular rollers 214, the frictional force between the outer surface of one end of the piston abutting rod 27 and the limiting frame 29 can be reduced, making it easier to push, reducing wear between the two, and improving service life. The limiting device 2 also includes a limiting telescopic rod 215, the outer surface of which is inserted into the inner wall of the first spring 23, and both ends are fixedly installed on one side of the extrusion block 22 and one side of the inner wall of the groove 21, respectively. By setting the limiting telescopic rod 215, the inner wall of the first spring 23 can be supported and reinforced, making it less prone to damage during use, facilitating the later reset of the extrusion block 22, and improving service life.

[0034] Working Principle: When using the electromagnetic heat treatment machine 1 to heat treat the gear, the inner wall of the gear is fitted onto the outer surface of several limiting brackets 29 on the cylinder 26. One side of the gear then abuts against one side of several extrusion blocks 22. Under its own weight, the extrusion blocks 22 slide downwards within the inner wall of the groove 21, causing the first spring 23 to contract. This forces the hydraulic oil in the groove 21 into the guide hole 25, and then into the hydraulic oil chamber 24. Because there is a gap between the piston abutment rod 27, which penetrates the hydraulic oil chamber 24, and the inner wall of the hydraulic oil chamber 24, the piston abutment rod 27 can be pushed upwards. This causes the second spring 28 on one side to contract, pushing one end of the limiting brackets 29 outwards within the inner wall of the cylinder 26. This stretches the third spring 210 on one side of the limiting brackets 29. One side of each limiting bracket 29 abuts against and supports the inner wall of the gear, centrally supporting and limiting it, allowing for rapid alignment with the electromagnetic heating element. The inner wall of ring 5 prevents displacement, improves the heat treatment effect and quality, reduces production costs and defect rate. Simultaneously, by adjusting its own gravity, it can center and support gears of different diameters, improving the applicability of the electromagnetic heat treatment machine 1. During heat treatment, the electric telescopic rod 4 can be activated to drive the slide 3 and the gear supported by the limit to slide upwards to a certain position, inserting the gear into the interior of the electromagnetic heating ring 5. Then, the electromagnetic heat treatment machine 1 is activated, utilizing the principle of electromagnetic induction heating. A high-frequency current generates an alternating magnetic field on the electromagnetic heating ring 5 to raise the temperature, rapidly heating the surface of the gear placed inside to the required temperature, thereby changing its metallographic structure and improving hardness and wear resistance. The heating process is mainly concentrated on the gear surface, ensuring that the internal structure is not excessively affected. After heating, the electric telescopic rod 4 is driven to drive the slide 3 downwards inside the electromagnetic heat treatment machine 1 to the corresponding position, causing the heat-treated gear to descend into the coolant inside the electromagnetic heat treatment machine 1 for rapid or moderate cooling to further optimize the hardening effect.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gear processing heat treatment apparatus, comprising an electromagnetic heat treatment machine (1), characterized in that: The inner wall of the electromagnetic heat treatment machine (1) is provided with an electromagnetic heating coil (5). A slide (3) is slidably installed on one side of the inner wall of the electromagnetic heat treatment machine (1). An electric telescopic rod (4) is fixedly installed on one side of the slide (3). One end of the electric telescopic rod (4) is fixedly installed on one side of the inner wall of the electromagnetic heat treatment machine (1). A limiting device (2) is provided on one side of the slide (3). The limiting device (2) can place the gear on several extrusion blocks (22) and press the extrusion blocks (22) with its own weight to push the hydraulic oil inside the groove (21) into the guide hole (25) and the hydraulic oil chamber (24). Then, the piston abutment rod (27) pushes several limiting frames (29) to slide outward in the inner wall of the cylinder (26) to center and limit the inner wall of the gear.

2. The gear processing heat treatment apparatus according to claim 1, characterized in that: The limiting device (2) includes several extrusion blocks (22), and several grooves (21) are provided on one side of the slide (3). The extrusion blocks (22) are slidably installed in the inner wall of the grooves (21). A hydraulic oil chamber (24) is provided inside the slide (3). Several guide holes (25) are provided inside the slide (3). The inner walls of the several guide holes (25) connect the interior of the several grooves (21) with the inner wall of the hydraulic oil chamber (24). Several first springs (23), wherein the two ends of the first springs (23) are respectively fixedly installed on one side of the extrusion block (22) and one side of the inner wall of the groove (21); A cylinder (26), wherein one side of the cylinder (26) is fixedly mounted on one side of the carriage (3); The piston abutment rod (27) has one end slidably mounted in the inner wall of the hydraulic oil chamber (24), while the other end extends through one side of the inner wall of the hydraulic oil chamber (24) and into the inner wall of the cylinder (26). The second spring (28) has its inner wall sleeved on the outer surface of the piston abutment rod (27), and its two ends are respectively fixedly installed on one side of the piston abutment rod (27) and one side of the inner wall of the hydraulic oil chamber (24); Several limiting brackets (29), one end of which is installed through the inner wall of the cylinder (26), and one side of which abuts against the outer surface of one end of the piston abutment rod (27); Several third springs (210) are provided, wherein the two ends of the third springs (210) are respectively fixedly installed on one side of the limit frame (29) and the outer surface of the cylinder (26).

3. The gear processing heat treatment apparatus according to claim 2, characterized in that: A plurality of protrusions (211) are fixedly installed on one side of the limiting frame (29), wherein the protrusions (211) are located on the side of the limiting frame (29) away from the third spring (210).

4. The gear processing heat treatment apparatus according to claim 2, characterized in that: A limiting block (212) is fixedly installed on one side of one end of the limiting frame (29), and the limiting block (212) is fixedly installed on one side of the limiting frame (29) at an angle.

5. A gear processing heat treatment apparatus according to claim 2, characterized in that: The limiting device (2) also includes a filter screen (213), wherein the outer surface of the filter screen (213) is fixedly installed in the inner wall of the cylinder (26).

6. The gear processing heat treatment apparatus according to claim 2, characterized in that: A plurality of circular rollers (214) are rotatably mounted on one side of the limiting frame (29), wherein the plurality of circular rollers (214) are arranged at equal intervals.

7. A gear processing heat treatment apparatus according to claim 2, characterized in that: The limiting device (2) further includes a limiting telescopic rod (215), wherein the outer surface of the limiting telescopic rod (215) is inserted into the inner wall of the first spring (23), and both ends are fixedly installed on one side of the extrusion block (22) and one side of the inner wall of the groove (21), respectively.

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