Gear heat treatment equipment for automobile steering gear production

Abstract

The application discloses a gear heat treatment equipment for automobile steering gear production and relates to the technical field of gear heat treatment, which comprises a quenching pool, a heat treatment module and a pre-quenching module. The heat treatment module comprises a sealing cover, the sealing cover is fixed in the quenching pool through a support, a high-frequency heating ring is inlaid and fixed on the sealing cover, the pre-quenching module comprises a first mounting plate, a fourth mounting plate and a protective shell, the first mounting plate is fixedly installed on the sealing cover, two oppositely arranged connecting plates are hingedly installed on the first mounting plate, two second mounting plates are hingedly installed on the fourth mounting plate, and a rhombic structure is formed between the two connecting plates and the two second mounting plates. The gear tooth surface can be pre-quenched by the spray head, and the process can significantly improve the hardness of the tooth surface. When the gear is entirely immersed in the quenching liquid for final quenching, the lower temperature makes the gear root part obtain higher toughness, and the durability and service life of the gear are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of gear heat treatment technology, specifically to a gear heat treatment device for the production of automotive steering systems. Background Technology

[0002] The current conventional process for heat treatment of gears is as follows: the gear is placed on a lifting platform, the lifting platform is driven to rise, and the gear is heated by a high-frequency heating ring; after heating, the lifting platform drives the gear to be immersed in quenching liquid to complete the quenching; the durability of gears treated in this way is significantly improved.

[0003] Currently, the common method for quenching gears is to heat them to a conventional quenching temperature (approximately 900°C) and then immerse them in a quenching liquid. However, this method results in excessively high overall hardness and insufficient toughness in the gears. During use, the risk of tooth breakage increases significantly, leading to severe degradation of durability. While quenching gears at a lower temperature (approximately 700°C) can achieve higher toughness, its strength (and consequently, wear resistance) decreases significantly. Currently, there is a lack of new gear heat treatment equipment that can produce gears with both excellent wear resistance and high toughness. Summary of the Invention

[0004] To address the problem mentioned in the background art that current gear heat treatment equipment cannot simultaneously achieve both wear resistance and high toughness in the treated gears, the present invention aims to provide a gear heat treatment equipment for the production of automotive steering systems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a gear heat treatment apparatus for automobile steering gear production, comprising:

[0006] A quenching tank, wherein a first inlet pipe and an outlet pipe are installed on the quenching tank;

[0007] The heat treatment module includes a sealing cover, which is fixed in the quenching tank by a bracket. The lower end of the sealing cover extends into the quenching liquid in the quenching tank. A high-frequency heating ring is embedded and fixed on the sealing cover.

[0008] The pre-quenching module includes a first mounting plate, a fourth mounting plate, and a protective shell. The first mounting plate is fixedly mounted on a sealing cover. Two opposing connecting plates are hinged to the first mounting plate. A second mounting plate is hinged to one side of each connecting plate. The two second mounting plates are hinged to the fourth mounting plate. Several mounting slots are provided on the second mounting plates. A hollow rod is embedded and fixed in each mounting slot. Several nozzles are embedded in the hollow rod. A rhomboid structure is formed between the two connecting plates and the two second mounting plates.

[0009] Preferably, the fourth mounting plate has a support frame inside, the protective shell has a linear drive component inside, the linear drive component is driven to connect to a support rod, and the support rod is fixedly connected to the support frame.

[0010] Preferably, the sealing cover is equipped with an air inlet pipe and an air outlet pipe, and both the air inlet pipe and the air outlet pipe are equipped with solenoid valves.

[0011] Preferably, a guide plate is fixedly installed on the support rod, a heat insulation fixing sleeve is provided on the support frame, an installation tube is provided inside the protective shell, a displacement sensor is installed in the installation tube, a heat insulation rod is fixedly installed inside the heat insulation fixing sleeve, one end of the heat insulation rod is inserted into the displacement sensor and cooperates with it, and the heat insulation rod passes through the guide plate and slides with it.

[0012] Preferably, a spring is installed between the heat insulation fixing sleeve and the guide plate, the spring is sleeved on the corresponding heat insulation rod, and the two ends of the spring are fixedly connected to the heat insulation fixing sleeve and the guide plate respectively.

[0013] Preferably, the nozzle is a fan-shaped nozzle.

[0014] Preferably, the sealing cover is provided with a flow divider ring, the flow divider ring has a flow divider channel, each flow divider ring is fitted with a second liquid inlet pipe, each second liquid inlet pipe is fitted with a solenoid valve, and the hollow rod is connected to the corresponding flow divider ring through a connecting pipe.

[0015] Preferably, a buffer base is installed on one side of the fourth mounting plate, and a contact pin is embedded and fixedly installed on one side of the buffer base.

[0016] Preferably, both the first inlet pipe and the outlet pipe are equipped with solenoid valves, and the inner wall of the quenching tank is equipped with a water level monitoring sensor.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. This invention allows for pre-quenching of gear tooth surfaces using a spray nozzle. This process significantly improves tooth surface hardness, thereby reducing wear during gear meshing and extending their service life. Simultaneously, this pre-quenching treatment results in a relatively low temperature at the tooth root. When the gear is subsequently immersed in the quenching liquid for final quenching, the lower temperature allows the tooth root to achieve lower hardness and higher toughness. This improves the durability of the tooth root, effectively preventing tooth breakage due to excessive hardness, and significantly enhancing the gear's durability and service life.

[0019] 2. This invention is equipped with multiple sets of quenching fluid nozzles. By adjusting each set of nozzles, the flow rate of the quenching fluid can be precisely controlled. The nozzles closer to the pitch circle region are activated first, applying a higher flow rate of quenching fluid, allowing this region to complete quenching first. This process results in higher hardness on the tooth surface near the pitch circle (this area typically experiences greater wear), thereby effectively enhancing the wear resistance of the tooth surface.

[0020] 3. In this invention, when heating the gear, the gear must first be mounted on the positioning plate. Then, a linear lifting device lifts the gear and moves it into the sealed cover. The lower part of the sealed cover is immersed in the quenching liquid, ensuring the gear is positioned inside the sealed cover and within the effective heating zone of the high-frequency heating ring. Throughout the entire process cycle from the gear being heated by the high-frequency heating ring to its final immersion in the quenching liquid, the gear remains within the sealed space of the sealed cover. Precise control of the protective atmosphere through the air inlet and outlet pipes above the sealed cover maintains a constant high-temperature environment inside the sealed cover. This measure effectively suppresses thermal cracks in the gear caused by rapid temperature changes. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the basic structure of a gear heat treatment device for automobile steering gear production according to the present invention.

[0022] Figure 2 This is a schematic diagram showing the installation position of a linear lifting component in a gear heat treatment equipment for automobile steering gear production according to the present invention.

[0023] Figure 3 This is a schematic diagram of the internal structure of a sealing cover for a gear heat treatment device used in the production of automotive steering gears, according to the present invention.

[0024] Figure 4 This invention relates to a gear heat treatment apparatus for the production of automotive steering systems. Figure 3 Enlarged view of part A.

[0025] Figure 5 This diagram illustrates the meshing relationship between the gear and the pre-quenching module in a gear heat treatment device for automotive steering gear production according to the present invention. Figure 1 .

[0026] Figure 6 This diagram illustrates the meshing relationship between the gear and the pre-quenching module in a gear heat treatment device for automotive steering gear production according to the present invention. Figure 2 .

[0027] Figure 7 This is a schematic diagram of the basic structure of the pre-quenching module of a gear heat treatment equipment for automobile steering gear production according to the present invention. Figure 1 .

[0028] Figure 8 This is a schematic diagram of the basic structure of the pre-quenching module of a gear heat treatment equipment for automobile steering gear production according to the present invention. Figure 2 .

[0029] Figure 9 This is a schematic diagram of the basic structure of the pre-quenching module of a gear heat treatment equipment for automobile steering gear production according to the present invention. Figure 3 .

[0030] Figure 10 This is a schematic diagram showing the fit between the hollow rod and the mounting groove in a gear heat treatment device for automobile steering gear production according to the present invention.

[0031] Figure 11 This is a schematic diagram of the meshing between gears in a gear heat treatment device for the production of automotive steering systems according to the present invention.

[0032] Figure 12 This is a schematic diagram of the spray direction of a nozzle in a gear heat treatment device for automobile steering gear production according to the present invention.

[0033] Figure 13 This is a schematic diagram of the pre-quenching module of a gear heat treatment equipment for automobile steering gear production according to the present invention when the gear diameter is large.

[0034] Figure 14 This is a schematic diagram of the pre-quenching module of a gear heat treatment equipment for automobile steering gear production according to the present invention when the gear diameter is small.

[0035] In the picture:

[0036] 101. Quenching tank; 102. First liquid inlet pipe; 103. Liquid outlet pipe; 104. Support; 105. Linear lifting component; 106. Positioning plate; 107. Gear;

[0037] 200. Heat treatment module; 201. Sealing cover; 202. High-frequency heating ring; 203. Air inlet pipe; 204. Air outlet pipe; 205. Diverter ring; 206. Second liquid inlet pipe; 207. Connecting pipe;

[0038] 300. Pre-quenching module; 301. First mounting plate; 302. Connecting plate; 303. Second mounting plate; 304. Fourth mounting plate; 305. Buffer base; 306. Stylus pin; 307. Mounting groove; 308. Hollow rod; 309. Nozzle; 310. Protective shell; 311. Linear drive component; 312. Support rod; 313. Guide plate; 314. Mounting tube; 315. Heat insulation fixing sleeve; 316. Heat insulation rod; 317. Spring; 318. Support frame; 319. Displacement sensor. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Reference Figure 11 The diagram shows two meshing gears. The main friction point of the gears is c1 in the diagram, which is close to the pitch circle (the pitch circle is the dashed circle c4 in the diagram). When the gears are in use, the most likely place to wear out is c1. Currently, gear tooth breakage mainly occurs at the tooth root c2. The breakage is illustrated at c3. The main cause of tooth breakage is that the gear has too high hardness and insufficient toughness.

[0041] like Figures 1-3 As shown in the figure, this embodiment provides a gear heat treatment equipment for the production of automotive steering gears, including a quenching tank 101. A first liquid inlet pipe 102 and a liquid outlet pipe 103 are installed on the quenching tank 101. Solenoid valves are installed on both the first liquid inlet pipe 102 and the liquid outlet pipe 103. A water level monitoring sensor is installed on the inner wall of the quenching tank 101.

[0042] In this embodiment, the system controlling and communicating the various components is a PLC control system. This system is a conventional existing technology and is not shown in the figure or described in detail. The quenching fluid in the quenching tank 101 is a PAG (polyethylene glycol) polymer water-based quenching fluid. This quenching fluid uses a specific PAG polymer as its core component, with added rust inhibitors, corrosion inhibitors, etc. Its significant feature is its good water solubility, which allows it to mix with water in a certain proportion to form a uniform and stable quenching medium. To achieve stability and controllability of the quenching process, a high-precision water level monitoring sensor is installed in the quenching tank 101. The main function of this water level monitoring sensor is to monitor the liquid level of the quenching fluid inside the quenching tank 101 in real time and continuously. When the monitoring data indicates that the liquid level in the tank is lower than the preset safe working threshold (i.e., the liquid level is too low), the system will automatically trigger the liquid replenishment mechanism. At this time, the quenching fluid will be stably injected into the quenching pool 101 through the first inlet pipe 102, thereby replenishing the liquid level to the specified range and ensuring that the workpiece is covered with sufficient medium in subsequent quenching operations.

[0043] A temperature sensor is installed at the bottom of the quenching tank 101. This temperature sensor continuously monitors the real-time temperature of the quenching liquid in the tank. During continuous quenching operations, the quenching liquid absorbs a large amount of heat released by the workpiece, causing its temperature to gradually rise. When the temperature sensor detects that the quenching liquid temperature exceeds the upper limit allowed by the process (i.e., the temperature is too high), the control system will respond immediately. On the one hand, the system commands the control valve on the outlet pipe 103 to discharge part or a fixed amount of the quenching liquid with excessive temperature from the tank into the system. At the same time, in order to maintain the balance of liquid level and temperature in the tank, the system will simultaneously replenish the quenching tank 101 with fresh quenching liquid at a suitable temperature (usually at room temperature or after recycling and cooling treatment) through the first inlet pipe 102. This linkage control mechanism based on the water level and temperature dual sensors constitutes a closed-loop quenching medium management system, ensuring that the medium state (sufficient liquid level and suitable temperature) in the quenching tank 101 is always at the optimal process window, providing a solid foundation for the stability and repeatability of gear quenching quality.

[0044] In this embodiment, refer to Figures 2-14 The quenching pool 101 is equipped with a linear lifting component 105, which can be a hydraulic cylinder or a linear drive cylinder. The linear lifting component 105 is driven by a positioning plate 106, and a gear 107 is installed on the positioning plate 106.

[0045] The heat treatment module 200 includes a sealing cover 201. The sealing cover 201 contains two temperature sensors (neither of which is shown in the figure; one is an infrared temperature sensor, mainly used to confirm the temperature reached by the gear 107, and the other is a high-temperature resistant NTC temperature sensor used to monitor the internal temperature of the sealing cover 201). The sealing cover 201 is fixed to the quenching tank 101 by a bracket 104. The lower end of the sealing cover 201 extends into the quenching liquid within the quenching tank 101. A high-frequency heating ring 202 is embedded and fixed on the sealing cover 201. An air inlet pipe 203 and an air outlet pipe 204 are installed on the sealing cover 201, and both the air inlet pipe 203 and the air outlet pipe 204 are equipped with solenoid valves.

[0046] In this embodiment, when the sealing cover 201 is placed on the quenching liquid, an independent space is formed inside the sealing cover 201. Gas can enter and exit through the air inlet pipe 203 and the air outlet pipe 204 (the air inlet pipe 203 is connected to the air outlet of the pump station, which is used to fill the sealing cover 201 with gas; the pump station is not shown in the figure). This controls the temperature of the space inside the sealing cover 201 (when the temperature is high, the solenoid valves on the air inlet pipe 203 and the air outlet pipe 204 are opened, and the pump station fills the sealing cover 201 with gas, allowing the high-temperature gas to be discharged from the air outlet pipe 204). The sealing cover 201 can also prevent the quenching liquid from splashing when the gear 107 is heated and immersed in the quenching liquid.

[0047] In this embodiment, the linear lifting component 105 is first controlled to retract, immersing the positioning plate 106 in the quenching liquid. Then, the gear 107 is clamped by a jig, inserted into the quenching liquid, and placed on the positioning plate 106. The jig is then removed, and the gear 107 is raised by the linear lifting component 105. When the gear 107 reaches the interior of the high-frequency heating ring 202, it is heated by the high-frequency heating ring 202. Finally, the linear lifting component 105 is controlled to retract, allowing the gear 107 to enter the quenching liquid for quenching. Throughout the entire process cycle from the gear 107 being heated by the high-frequency heating ring 202 to its final immersion in the quenching liquid, the gear 107 remains within the sealed space of the sealing cover 201. Precise control of the protective air temperature via the air inlet pipe 203 and air outlet pipe 204 above the sealing cover 201 maintains a constant high-temperature environment within the sealing cover 201. This measure effectively suppresses thermal cracks in the gear 107 caused by rapid temperature changes.

[0048] In another embodiment of this application, reference is made to Figures 4-10 It also includes a pre-quenching module 300, comprising a first mounting plate 301 and a fourth mounting plate 304. The first mounting plate 301 is fixedly mounted on the sealing cover 201. Two opposing connecting plates 302 are hinged to the first mounting plate 301. A second mounting plate 303 is hinged to one side of each connecting plate 302. The two second mounting plates 303 are hinged to the fourth mounting plate 304. Several mounting grooves 307 are provided on the second mounting plates 303. A hollow rod 308 is embedded and fixed in each mounting groove 307. Several nozzles 309 are embedded in the hollow rod 308. A rhomboid structure is formed between the two connecting plates 302 and the two second mounting plates 303 (see reference). Figure 7 ).

[0049] In this embodiment, the nozzle 309 is a fan-shaped nozzle, which sprays vertically. This spraying method can better control the contact area between the quenching liquid sprayed from the nozzle 309 and the gear 107, thereby better pre-quenching the gear surface (see reference). Figure 11 and Figure 12 The tooth surface at c1 has a higher hardness than the tooth root at c4, and the tooth root at c4 has a higher toughness than the tooth surface at c1, which gives gear 107 better wear resistance and a longer service life.

[0050] The fourth mounting plate 304 has a support frame 318 on its inner side, and the protective shell 310 has a linear drive component 311 inside. The linear drive component 311 is connected to the support rod 312. (Refer to...) Figure 4 and Figure 8 One end of the support rod 312 is fixedly connected to the support frame 318.

[0051] In this embodiment, the linear drive 311 integrates pressure sensing and braking functions. When in use, refer to... Figure 7 , Figure 13 and Figure 14 (in Figure 13 The diameter of gear C11 shown is greater than Figure 14 The diameter of gear C12 (shown) can be used to drive the stylus 306 to move toward gear 107 via the linear drive 311. This design allows this embodiment to be adapted to gears 107 with the same number of teeth but different diameters, thereby improving the versatility of this embodiment.

[0052] A guide plate 313 is fixedly installed on the support rod 312. A heat insulation fixing sleeve 315 is provided on the support frame 318. An installation tube 314 is also provided inside the protective shell 310. A displacement sensor 319 is installed in the installation tube 314. A heat insulation rod 316 is fixedly installed inside the heat insulation fixing sleeve 315. One end of the heat insulation rod 316 is inserted into the displacement sensor 319 and is set to cooperate with it. The heat insulation rod 316 passes through the guide plate 313 and is slidably engaged with it. A spring 317 is installed between the heat insulation fixing sleeve 315 and the guide plate 313. The spring 317 is sleeved on the corresponding heat insulation rod 316. The two ends of the spring 317 are respectively connected to the heat insulation fixing sleeve 315, the guide plate 313, and the guide plate 313. The guide plate 313 is fixedly connected, and a buffer base 305 is installed on one side of the fourth mounting plate 304. A stylus 306 is embedded and fixedly installed on one side of the buffer base 305. In this embodiment, the buffer base 305 is made of asbestos, which not only has good high temperature resistance, but also has a certain elasticity and can absorb impact. By contacting the heated gear with the stylus 306, the heat on the gear can be prevented from being conducted to the parts of the pre-quenching module 300 through the stylus 306, thus improving safety. A protective shell 310 is also installed on one side of the first mounting plate 301. The mounting tube 314 and the linear drive component 311 are both located inside the protective shell 310.

[0053] In this embodiment, refer to Figure 7 , Figure 13 and Figure 14 (in Figure 13 The diameter of gear C11 shown is greater than Figure 14 (The diameter of gear C12 shown is given). If the diameter of gear 107 is not input, the dimensions of the rhomboid structure formed by the connecting plate 302 and the second mounting plate 303 can be adjusted by the linear drive 311. The specific operation is as follows: First, drive the linear drive 311 to move the buffer base 305 toward the gear 107 until the stylus 306 contacts the gear 107. At this time, the pressure sensor built into the linear drive 311 will trigger a signal and stop running. Then, the extension length of the heat insulation rod 316 is detected by the mounting tube 314 to determine the diameter of gear 107. Finally, the quenching liquid spray volume of the nozzle 309 is set according to the obtained data. The spray volume of the nozzle 309 is smaller the further away from the gear 107.

[0054] The sealing cover 201 is provided with a flow divider ring 205, and a flow divider channel is opened in the flow divider ring 205. Each flow divider ring 205 is fitted with a second liquid inlet pipe 206, and each second liquid inlet pipe 206 is fitted with a solenoid valve. The hollow rod 308 is connected to the corresponding flow divider ring 205 through a connecting pipe 207. The flow divider ring 205 is connected to the quenching liquid supply pump body (not shown in the figure) through a pipeline.

[0055] In this embodiment, refer to Figure 3 The connecting pipe 207 extends through the sealing cover 201 to its outer side, preventing the connecting pipe 207 from entering the inner side of the high-frequency heating ring 202.

[0056] The usage steps in this embodiment are as follows:

[0057] The first step is to control the positioning plate 106 to be immersed in the quenching liquid by the linear lifting component 105, and then use a robotic arm or clamp (robotic arms and clamps are conventional technologies in this field and are not shown in the figure) to immerse the gear 107 in the quenching liquid and clamp it on the positioning plate 106.

[0058] The second step is to control the gear 107 to enter the inner side of the high-frequency heating ring 202 through the linear lifting component 105, start the high-frequency heating ring 202 to heat the gear 107, and stop the high-frequency heating ring 202 after the temperature of the gear 107 teeth reaches the set temperature.

[0059] The third step involves controlling the gear 107 to be set up with the corresponding pre-quenching modules 300 via the linear lifting component 105. The linear drive component 311 is activated, driving the stylus 306 to move towards the gear 107. After the linear drive component 311 detects that the stylus 306 is in contact with the gear 107, the linear drive component 311 stops and sprays quenching liquid towards the tooth surface of the gear 107 through the nozzle 309.

[0060] Step 4: After waiting for a period of time, the tooth surface has been quenched. At this time, the gear 107 is controlled by the linear lifting component 105 to enter the quenching liquid in the quenching pool 101 to complete the overall quenching operation of the gear 107. The gear 107 can then be removed by a robotic arm or clamp.

[0061] The gear 107, processed using the aforementioned techniques, exhibits a gradient optimization of its microstructure and mechanical properties: a high-hardness martensite layer forms on the tooth surface under high-temperature quenching, significantly improving its wear resistance; while the tooth root possesses a composite structure of austenite and ductile ferrite, endowing it with excellent fracture toughness and impact resistance. This combination of rigidity and flexibility in material distribution allows gear 107 to possess both high wear resistance and excellent toughness. The high-hardness layer on the tooth surface effectively inhibits wear during gear meshing and rotation, significantly extending the maintenance period of tooth surface accuracy; the high toughness of the tooth root absorbs impact energy through plastic deformation, fundamentally suppressing the risk of tooth breakage caused by stress concentration. The synergistic effect of these two factors results in a breakthrough improvement in the overall service performance of gear 107 under high-speed, heavy-load conditions, with both its bending fatigue limit and contact fatigue life achieving orders-of-magnitude increases, ultimately manifesting as enhanced reliability and reduced maintenance costs throughout its entire life cycle.

[0062] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying 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.

[0063] 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 gear heat treatment apparatus for the production of automotive steering systems, characterized in that, include: Quenching pool (101), on which a first liquid inlet pipe (102) and a liquid outlet pipe (103) are installed. The heat treatment module (200) includes a sealing cover (201), which is fixed in the quenching pool (101) by a bracket (104). The lower end of the sealing cover (201) extends into the quenching liquid in the quenching pool (101). A high-frequency heating ring (202) is embedded and fixed on the sealing cover (201). The pre-quenching module (300) includes a first mounting plate (301), a fourth mounting plate (304), and a protective shell (310). The first mounting plate (301) is fixedly mounted on the sealing cover (201). Two opposing connecting plates (302) are hinged on the first mounting plate (301). A second mounting plate (303) is hinged on one side of each connecting plate (302). The two second mounting plates (303) are hinged on the fourth mounting plate (304). Several mounting grooves (307) are provided on the second mounting plates (303). A hollow rod (308) is embedded and fixed in each mounting groove (307). Several nozzles (309) are embedded in the hollow rod (308). A rhomboid structure is formed between the two connecting plates (302) and the two second mounting plates (303). The fourth mounting plate (304) is provided with a support frame (318) on its inner side, and the protective shell (310) is provided with a linear drive (311). The linear drive (311) is driven to connect a support rod (312), and the support rod (312) is fixedly connected to the support frame (318). A guide plate (313) is fixedly installed on the support rod (312), a heat insulation fixing sleeve (315) is provided on the support frame (318), and an installation tube (314) is also provided inside the protective shell (310). A displacement sensor (319) is installed in the installation tube (314), and a heat insulation rod (316) is fixedly installed inside the heat insulation fixing sleeve (315). One end of the heat insulation rod (316) is inserted into the displacement sensor (319) and is set to cooperate with it. The heat insulation rod (316) passes through the guide plate (313) and slides with it. A spring (317) is installed between the heat insulation fixing sleeve (315) and the guide plate (313). The spring (317) is sleeved on the corresponding heat insulation rod (316). The two ends of the spring (317) are fixedly connected to the heat insulation fixing sleeve (315) and the guide plate (313) respectively.

2. The gear heat treatment equipment for automobile steering gear production according to claim 1, characterized in that, An air inlet pipe (203) and an air outlet pipe (204) are installed on the sealing cover (201), and a solenoid valve is installed on both the air inlet pipe (203) and the air outlet pipe (204).

3. The gear heat treatment equipment for automobile steering gear production according to claim 1, characterized in that, The nozzle (309) is a fan-shaped nozzle.

4. A gear heat treatment device for automobile steering gear production according to claim 1, characterized in that, The sealing cover (201) is provided with a diversion ring (205), and a diversion channel is opened in the diversion ring (205). A second liquid inlet pipe (206) is installed on each diversion ring (205), and a solenoid valve is installed on each second liquid inlet pipe (206). The hollow rod (308) is connected to the corresponding diversion ring (205) through a connecting pipe (207).

5. A gear heat treatment apparatus for automobile steering gear production according to claim 1, characterized in that, A buffer base (305) is installed on one side of the fourth mounting plate (304), and a stylus (306) is embedded and fixedly installed on one side of the buffer base (305).

6. A gear heat treatment apparatus for automobile steering gear production according to claim 1, characterized in that, Solenoid valves are installed on both the first liquid inlet pipe (102) and the liquid outlet pipe (103), and a water level monitoring sensor is installed on the inner wall of the quenching pool (101).

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