Gearbox gear quenching device and quenching method

Abstract

The invention relates to a gearbox gear quenching device and a quenching method, and the quenching method comprises the following steps: removing oxygen in water at the temperature of 15-25 DEG C, and then adding iron powder into the water; the gearbox gear is heated to 880 + / -20 DEG C and then immersed in cold water; a gas film is generated on the surface of the gearbox gear, water is stirred, the iron powder makes contact with the gas film and reacts with the gas film, ferroferric oxide and hydrogen are generated, and therefore the gas film is promoted to be broken; and when the surface temperature of the gear is reduced to 230 + / -20 DEG C, the gear is taken out of the cold water. A proper amount of iron powder is added into water, during quenching, water on the surface of the gear is gasified to form a high-temperature water vapor gas film, iron can react with the high-temperature gas film to generate ferroferric oxide and hydrogen when making contact with the gas film, part of water vapor forming the gas film can be consumed through the reaction, and therefore the gas film is promoted to be broken, and the gear can make direct contact with the water.

Description

Technical Field

[0001] The invention belongs to the technical field of quenching, and in particular to a gearbox gear quenching device and a quenching method. Background Art

[0002] During the production process of gearbox gears, quenching treatment is usually required in order to increase the surface hardness of the gears, improve wear resistance, and improve mechanical properties. An existing commonly used quenching process is cold water quenching, which is to heat the gears to a certain temperature and then put them into cold water (i.e., room temperature water), and use cold water to quickly cool them down. This process has the advantages of fast cooling speed and low cost, so it is widely used. However, a common problem with cold water quenching is that after the heated workpiece is placed in cold water, an air film is generated on the surface of the workpiece. The air film is not easy to break, and it is difficult to quickly eliminate the air film even if the cold water is stirred. The air film separates the cold water from the workpiece, affecting the quenching efficiency and quenching effect. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a gearbox gear quenching device and a quenching method, which can promote the rapid rupture of the air film, thereby ensuring the quenching effect.

[0004] To solve the above problems, the technical solution adopted by the present invention is: a gearbox gear quenching method, removing oxygen from water, the water temperature is 15-25°C, and then adding iron powder to the water; heating the gearbox gear to 880±20°C, and then immersing it in cold water; an air film is generated on the surface of the gearbox gear, and the water is stirred so that the iron powder contacts and reacts with the air film to generate ferroferric oxide and hydrogen, thereby causing the air film to rupture; when the gear surface temperature drops to 230±20°C, the gear is taken out of the cold water.

[0005] Furthermore, sponge iron is added to the water, the sponge iron is used to absorb oxygen in the water, and then the water is filtered to remove oxygen in the water.

[0006] Furthermore, the gears are constantly shaken during the quenching process.

[0007] The quenching device using the above method includes a quenching box, which is provided with a stirring mechanism and a gear temperature detection mechanism, a sealing cover is provided on the top of the quenching box, a gear supporting mechanism is provided on the lower surface of the sealing cover, a lifting mechanism is connected to the upper surface of the sealing cover, and a first exhaust pipe is provided on the sealing cover; water is provided in the quenching box, and iron powder is provided in the water.

[0008] Furthermore, the gear support mechanism includes a horizontal first beam and a horizontal second beam, a plurality of support grooves are arranged between the first beam and the second beam, the support grooves include a bottom plate, two side plates and two end plates, the bottom plate is an arc shape with a downward depression in the middle, a plurality of water holes are arranged on the bottom plate, the side plate and the end plate, and a wavy positioning convex strip is arranged on the inner side wall of the side plate; the first beam and the second beam are connected to the sealing cover through a telescopic mechanism.

[0009] Furthermore, a deaerator box is arranged outside the quenching box, sponge iron suspended particles are arranged in the deaerator box, the first exhaust pipe is connected to the bottom of the deaerator box, a removable top cover is arranged on the top of the deaerator box, a water inlet, a feeding port and a second exhaust pipe are arranged on the top cover, and openable and closable sealing doors are arranged in the water inlet and the feeding port; a cooling box is arranged between the deaerator box and the quenching box, and the deaerator box, the cooling box and the quenching box are connected in sequence by water pipes, and a water pump is arranged on the water pipes.

[0010] Furthermore, the sponge iron suspension particles include hollow particles, a sponge iron layer and a coating mesh arranged in sequence from the inside to the outside, and the total density of the sponge iron suspension particles is 1-1.1 g / cm 3 .

[0011] Furthermore, the cooling box is provided with a plurality of heat dissipation pipes which horizontally penetrate the cooling box, and the heat dissipation pipes are connected to fans.

[0012] Further, the positioning convex strip includes a connecting convex strip, the connecting convex strip is provided with a connecting side wall and a positioning side wall, the connecting side wall is fixedly connected to the side plate, and a first magnetic attraction strip is embedded on the positioning side wall; a second magnetic attraction strip is provided on the upper surface of the bottom plate;

[0013] During quenching, the second magnetic bar supports the tooth top of the gear, the first magnetic bar positions the two side surfaces of the gear, and the second magnetic bar and the first magnetic bar absorb iron powder through magnetic force, so that the iron powder quickly and fully contacts the tooth top and side surfaces of the gear; the generated ferroferric oxide is also absorbed by the second magnetic bar and the first magnetic bar; after quenching is completed, the iron powder and ferroferric oxide absorbed by the second magnetic bar and the first magnetic bar are cleaned.

[0014] Furthermore, the gear temperature detection mechanism is an infrared thermal imager.

[0015] The beneficial effects of the present invention are as follows: by adding an appropriate amount of iron powder to water, during quenching, the water on the surface of the gear is vaporized to form a high-temperature water vapor film. When the iron contacts the film, it can react with the high-temperature film to generate ferroferric oxide and hydrogen. This reaction can consume part of the water vapor constituting the film, thereby causing the film to rupture and the gear to directly contact the water. By stirring the water, the uniformity of the quenching can be ensured, and at the same time, the iron powder in the water can continuously contact the film on the outer wall of the gear, thereby continuously consuming the film. Removing oxygen from the water first can prevent the iron powder from being oxidized. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the front view of the quenching device of the present invention;

[0017] Figure 2 yes Figure 1 Middle AA section view;

[0018] Figure 3 It is a top view schematic diagram of a single support slot;

[0019] Figure 4 yes Figure 3 Schematic diagram of the cross section of the middle BB;

[0020] Figure 5 2 is a schematic cross-sectional view of a positioning convex strip;

[0021] Figure 6 It is a schematic diagram of the connection between the deaerator box, the cooling box and the quenching box;

[0022] Figure 7 is a schematic diagram of sponge iron suspension particles;

[0023] Figure numerals: 1—quenching box; 2—stirring mechanism; 3—sealing cover; 4—lifting mechanism; 5—first exhaust pipe; 6—gear temperature detection mechanism; 7—first crossbeam; 8—second crossbeam; 9—support groove; 91—bottom plate; 911—second magnetic strip; 92—side plate; 93—end plate; 94—water hole; 95—positioning convex strip; 951—connecting convex strip; 952—connecting side wall; 953—positioning side wall; 954—first magnetic strip; 10—telescopic mechanism; 11—deoxidation box; 12—sponge iron suspended particles; 121—hollow particles; 122—sponge iron layer; 123—coating net; 13—top cover; 14—water inlet; 15—feeding port; 16—second exhaust pipe; 17—sealed door; 18—cooling box; 19—water pump; 20—heat dissipation pipe; 21—fan. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] The gearbox gear quenching method of the present invention uses water as a quenching liquid, first removes oxygen from the water, the water temperature is 15-25°C, and then iron powder is added to the water; the gearbox gear is heated to 880±20°C, and then immersed in cold water; an air film is generated on the surface of the gearbox gear, and the water is stirred so that the iron powder contacts and reacts with the air film to generate ferrosoferric oxide and hydrogen, thereby causing the air film to rupture; when the gear surface temperature drops to 230±20°C, the gear is taken out of the cold water.

[0026] In the present invention, the material of the gearbox gear is 20CrMnTi. The gearbox gear is heated by a heating furnace, and then the heated gear is transferred to water. Since the gear will dissipate heat and the temperature will decrease during the gear transfer process, the heating temperature of the gear should be higher than 880±20°C, for example, 900-920°C. After the heated gear is placed in water, the water on the surface of the gear is vaporized to form a high-temperature air film. When the gear just enters the water, the most water vapor is generated, and the air film is the least likely to break. At this time, the temperature of the air film can be as high as 700°C. It is known that iron can react with high-temperature water vapor to generate ferroferric oxide and hydrogen. Therefore, the present invention adds an appropriate amount of iron powder to water, and the particle size of the iron powder is 0.05-0.1mm. When the iron powder contacts the air film, it reacts with the water vapor constituting the air film, thereby consuming part of the air film. After part of the air film is consumed, it is difficult to maintain stability. It can be quickly broken under the flushing of water, avoiding the long-term existence of the air film and blocking the contact between the gear and water, thereby improving the quenching effect. By constantly stirring the water, the iron powder in the water can be continuously transported to the surface of the gear, thereby continuously consuming the air film; at the same time, the impact of the water is conducive to the rapid rupture of the air film; in addition, the water temperature near the gear increases, and after stirring, cold water from a distance can be transported to the vicinity of the gear to ensure the quenching effect.

[0027] Since iron is a very common material with relatively low cost, the quenching cost is low. The ferroferric oxide generated by the reaction can be recycled, and the hydrogen can be consumed by combustion, so no pollutants will be generated. The entire process basically does not generate waste gas, meeting environmental protection requirements.

[0028] Since iron powder is easily oxidized by oxygen, oxygen is first removed from the water to prevent the iron powder from being oxidized in the water. Various existing deoxygenation methods can be used to remove oxygen from the water. As a preferred embodiment, sponge iron is added to the water, the sponge iron is used to absorb oxygen in the water, and then the water is filtered to remove oxygen from the water.

[0029] Constantly shaking the gears during the quenching process is helpful to eliminate the air film. At the same time, since the water temperature near the gears is high, it is not conducive to the rapid cooling of the gears. By constantly shaking the gears, the water away from the gears and the water close to the gears can be mixed, the uniformity of the water temperature can be improved, and the quenching effect can be ensured.

[0030] The quenching device of the present invention, such as Figures 1 to 7 As shown, it includes a quenching box 1, which is a rectangular box body. A stirring mechanism 2 and a gear temperature detection mechanism 6 are arranged in the quenching box 1. The stirring mechanism 2 is used to stir the water to make the water and the gear contact evenly; the gear temperature detection mechanism 6 is used to detect the temperature of the gear surface. When the temperature of the gear surface drops to the set temperature, the gear can be taken out. A sealing cover 3 is arranged on the top of the quenching box 1. The sealing cover 3 is used to seal the upper port of the quenching box 1 during quenching to prevent the generated hydrogen from directly entering the workshop. A gear support mechanism is arranged on the lower surface of the sealing cover 3. The gear support mechanism is used to support the gear. A lifting mechanism 4 is connected to the upper surface of the sealing cover 3. The lifting mechanism 4 can drive the sealing cover 3 and the gear support mechanism to rise and fall synchronously, so as to open or seal the quenching box 1. The lifting mechanism 4 can specifically adopt a hydraulic cylinder. A support frame is arranged above the quenching box 1. The cylinder body of the hydraulic cylinder is fixedly installed on the support frame. The piston rod of the hydraulic cylinder is fixedly connected to the sealing cover 3. The sealing cover 3 is provided with a first exhaust pipe 5 for exhausting water vapor and hydrogen. The quenching box 1 is provided with water, which is deoxygenated water, and iron powder is provided in the water. The iron powder can be added before quenching, and quenching starts immediately after adding.

[0031] When the device is used for quenching, after removing oxygen from the water, water is passed into the quenching box 1, and the water can submerge the gear support mechanism. Then the lifting mechanism 4 is used to drive the sealing cover 3 to move upward to a suitable height so that the gear support mechanism is located outside the quenching box 1, and then the gear is heated and placed in the gear support mechanism, and an appropriate amount of iron powder is added to the water. The stirring mechanism 2 and the lifting mechanism 4 are started, and the stirring mechanism 2 stirs the water. The lifting mechanism 4 drives the sealing cover 3 and the gear support mechanism to move downward as a whole until the sealing cover 3 seals the upper port of the quenching box 1, and the gear support mechanism and the gear are immersed in water. During quenching, the generated water vapor and hydrogen are discharged through the first exhaust pipe 5, and the gear temperature detection mechanism 6 is used to monitor the temperature of the gear surface in real time. When the temperature of the gear surface drops to 230±20℃, the lifting mechanism 4 is used to drive the sealing cover 3 to move upward so that the gear moves to the top of the quenching box 1, and the gear is taken out, and the quenching is completed. The gear temperature detection mechanism 6 can use an infrared thermal imager, which can detect the surface temperature of the gear without contacting the gear. In order to ensure the stability of the sealing cover 3 when it moves up and down, a plurality of vertical guide columns can be arranged on the top of the quenching box 1 , and the guide columns penetrate the sealing cover 3 and slide with the sealing cover 3 .

[0032] The gear support mechanism can adopt any existing technology, but when the existing support mechanism supports the gear, part of the gear surface is always in contact with the support mechanism, and the contacted part is difficult to fully contact with water, resulting in a lower cooling rate of this part, while the part not in contact with the support mechanism has a higher cooling rate. The cooling rate is uneven, which affects the gear performance.

[0033] In the present invention, the gear support mechanism includes a horizontal first beam 7 and a horizontal second beam 8, a plurality of support grooves 9 are arranged between the first beam 7 and the second beam 8, the support grooves 9 include a bottom plate 91, two side plates 92 and two end plates 93, the bottom plate 91 is an arc shape with a downward depression in the middle, a plurality of water holes 94 are arranged on the bottom plate 91, the side plate 92 and the end plate 93, and a wavy positioning convex strip 95 is arranged on the inner side wall of the side plate 92; the first beam 7 and the second beam 8 are connected to the sealing cover 3 through a telescopic mechanism 10.

[0034] The distance between the positioning ridges 95 on the inner walls of the two side plates 92 is slightly greater than the thickness of the gear, and the inner cavity depth of the support groove 9 is greater than 1 / 2 of the outer diameter of the gear, ensuring that the gear can be stably placed in the support groove 9, and the bottom plate 91 is used to support the top of the gear teeth, and the two positioning ridges 95 are used to support the two side surfaces of the gear. The telescopic mechanism 10 can be telescopic, thereby driving the first crossbeam 7 and the second crossbeam 8 to move up and down. The upper end of the telescopic mechanism 10 is hinged to the sealing cover 3, and the lower end is hinged to the first crossbeam 7 or the second crossbeam 8.

[0035] During the quenching process, the heated gear is placed in the support groove 9, and one or more gears are placed in each support groove 9. After the gear support mechanism and the gear are immersed in water, the telescopic mechanism 10 is continuously extended and shortened, pushing the first beam 7 and the second beam 8 to continuously move up and down. Specifically, when the first beam 7 moves upward, the second beam 8 moves downward, and when the first beam 7 moves downward, the second beam 8 moves upward, so that the support groove 9 continuously changes the downward tilt direction. When the support groove 9 is tilted, the gear in the support groove 9 will roll along the bottom plate 91 to achieve the shaking of the gear. During the shaking process of the gear, the tooth top in contact with the bottom plate 91 is constantly changing, and the side position in contact with the positioning convex strip 95 is also constantly changing. Since the positioning convex strip 95 is wavy, during the rolling process of the gear, the contact position of its side with the positioning convex strip 95 is constantly changing in the circumferential and radial directions, avoiding the same position always contacting with the gear support mechanism and resulting in ineffective contact with water, which can improve the uniformity of cooling of various parts of the gear, thereby improving the surface quality of the gear.

[0036] The gas discharged from the first exhaust pipe 5 is water vapor and hydrogen. A cooling tank can be used to cool the gas to liquefy the water vapor, while the gaseous hydrogen can be removed by combustion without causing environmental pollution.

[0037] When sponge iron is used to absorb oxygen in water, the sponge iron reacts with oxygen to generate ferrous hydroxide and ferric hydroxide. Ferrous hydroxide and ferric hydroxide are insoluble in water, and most of them are precipitated at the bottom of the water, but a small part will adhere to the surface of the sponge iron and gradually wrap the sponge iron, affecting the deoxygenation rate of the sponge iron. Therefore, the sponge iron needs to be cleaned regularly to remove the ferrous hydroxide and ferric hydroxide attached to the surface of the sponge iron, which is a more troublesome operation.

[0038] In the present invention, a deaerator box 11 is arranged outside the quenching box 1. The deaerator box 11 can adopt a circular or rectangular box body. Sponge iron suspended particles 12 are arranged in the deaerator box 11. The first exhaust pipe 5 is connected to the bottom of the deaerator box 11. A detachable top cover 13 is arranged on the top of the deaerator box 11. A water inlet 14, a feeding port 15 and a second exhaust pipe 16 are arranged on the top cover 13. The water inlet 14 and the feeding port 15 are both provided with openable and closable sealing doors 17; a cooling box 18 is arranged between the deaerator box 11 and the quenching box 1, and the deaerator box 11, the cooling box 18 and the quenching box 1 are connected in sequence through a water pipe, and a water pump 19 is arranged on the water pipe.

[0039] The deaerator 11 is filled with water to be deoxygenated, and sponge iron suspended particles 12 are added to the water. During quenching, the gas generated in the quenching box 1 enters the bottom of the deaerator 11 through the first exhaust pipe 5. Since the water vapor generated during quenching is fast and the gas production is large, the gas flow rate in the first exhaust pipe 5 is large. After the gas enters the deaerator 11, it flows upward, causing impact on the water body and the sponge iron suspended particles 12, and causing the precipitated substances on the surface of the sponge iron suspended particles 12 to separate from the sponge iron suspended particles 12. At the same time, under the scouring of the gas, the sponge iron suspended particles 12 are evenly and fully contacted with the water to ensure the deoxygenation effect. The water temperature in the deaerator 11 is relatively low, and the water vapor entering the deaerator 11 gradually liquefies and stays in the deaerator 11, realizing water recovery, while a small part of the water vapor and hydrogen are discharged through the second exhaust pipe 16, and the hydrogen can be consumed by combustion. In order to ensure that the gas in the first exhaust pipe 5 enters the deaerator 11 evenly, a gas distribution pipe can be set at the bottom of the deaerator 11 so that the gas enters the deaerator 11 in a dispersed manner. After the high-temperature steam enters the deaerator box 11, the water temperature in the deaerator box 11 increases, so it is cooled to 15-25°C by the cooling box 18 and then transported to the quenching box 1.

[0040] When water needs to be added to the quenching box 1, the water pump 19 between the quenching box 1 and the cooling box 18 is turned on to transfer the water in the cooling box 18 to the quenching box 1. Then the water pump 19 between the cooling box 18 and the deaerator box 11 is turned on to transfer the water in the deaerator box 11 to the cooling box 18. A filter is provided on the water pipe connected to the deaerator box 11 to filter out the precipitation in the water and prevent the sponge iron suspended particles 12 from entering the cooling box 18.

[0041] In order to ensure the cooling speed of the cooling box 18, a plurality of heat dissipation pipes 20 are arranged in the cooling box 18 horizontally penetrating the cooling box 18, and the heat dissipation pipes 20 are connected to the fans 21. The fans 21 deliver the external cold air to the heat dissipation pipes 20, and the air circulates to take away the heat near the heat dissipation pipes 20, so as to cool the water.

[0042] The sponge iron suspension particles 12 include hollow particles 121, a sponge iron layer 122, and a coating net 123 arranged in sequence from the inside to the outside. The hollow particles 121 may be plastic particles. Since they are hollow, their density is very low, which can reduce the density of the entire sponge iron suspension particles 12. The coating net 123 may be a stainless steel wire mesh, which wraps the sponge iron suspension particles 12 to prevent the sponge iron suspension particles 12 from detaching from the hollow particles 121. The total density of the sponge iron suspension particles 12 is 1-1.1 g / cm 3 The density of the sponge iron suspended particles 12 is slightly greater than that of water, and the sponge iron suspended particles 12 can be suspended in the water or move slowly downward. When the gas enters the deaerator box 11 and flows upward, it impacts the sponge iron suspended particles 12, causing the sponge iron suspended particles 12 to be suspended in the water.

[0043] In order to enable the iron powder to quickly contact the air film, the positioning convex strip 95 of the present invention includes a connecting convex strip 951, the connecting convex strip 951 is provided with a connecting side wall 952 and a positioning side wall 953, the connecting side wall 952 is fixedly connected to the side plate 92, and the positioning side wall 953 is embedded with a first magnetic attraction strip 954; the upper surface of the bottom plate 91 is provided with a second magnetic attraction strip 911. The first magnetic attraction strip 954 and the second magnetic attraction strip 911 are made of magnetic material and can absorb iron powder by magnetic force.

[0044] During quenching, the second magnetic strip 911 supports the tooth top of the gear, and the first magnetic strip 954 positions the two side surfaces of the gear. The second magnetic strip 911 and the first magnetic strip 954 attract iron powder through magnetic force, so that the iron powder quickly and fully contacts the tooth top and side surfaces of the gear. The generated ferroferric oxide is also attracted by the second magnetic strip 911 and the first magnetic strip 954. After quenching is completed, the iron powder and ferroferric oxide attracted by the second magnetic strip 911 and the first magnetic strip 954 are cleaned.

[0045] When stirring the water, when the iron powder reaches the vicinity of the first magnetic strip 954 and the second magnetic strip 911, it is attracted by the first magnetic strip 954 and the second magnetic strip 911 and adheres to the first magnetic strip 954 and the second magnetic strip 911. The first magnetic strip 954 and the second magnetic strip 911 are in direct contact with the gear, thereby ensuring that the gear can quickly contact with enough iron powder to ensure the air film removal effect.

[0046] If the generated ferroferric oxide directly enters the water, it is inconvenient to clean it. The ferroferric oxide in the quenching box 1 needs to be cleaned frequently, which is inconvenient to clean. When cleaning, the remaining iron powder in the water is also cleaned up, resulting in waste. In the present invention, since the generated ferroferric oxide can also be adsorbed by the first magnetic strip 954 and the second magnetic strip 911, most of the ferroferric oxide stays on the first magnetic strip 954 and the second magnetic strip 911 and does not enter the water. After quenching is completed, the ferroferric oxide and the remaining iron powder on the first magnetic strip 954 and the second magnetic strip 911 are cleaned up at the same time. There is no need to clean the remaining iron powder in the water. The operation is more convenient, and the remaining iron powder in the water can continue to be used, reducing the waste of iron powder. When cleaning the first magnetic strip 954 and the second magnetic strip 911, just wipe them with a cloth.

[0047] Both iron powder and ferroferric oxide are in granular form. When the first magnetic strip 954 absorbs iron powder and ferroferric oxide, the iron powder and ferroferric oxide will rub against the side of the gear when the gear rolls in the support groove 9, which is conducive to breaking the air film on the side of the gear, thereby causing the air film to rupture into bubbles and be discharged.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gearbox gear quenching method, characterized in that: Remove oxygen from the water, the water temperature is 15-25℃, then add iron powder to the water; heat the gearbox gear to 880±20℃, then immerse it in cold water; An air film is generated on the surface of the gearbox. The water is stirred so that the iron powder contacts and reacts with the air film to generate ferroferric oxide and hydrogen, thereby causing the air film to rupture. When the surface temperature of the gear drops to 230±20℃, the gear is removed from the cold water.

2. The gearbox gear quenching method according to claim 1, characterized in that: Add sponge iron to the water, use the sponge iron to absorb oxygen in the water, and then filter it to remove oxygen from the water.

3. The gearbox gear quenching method according to claim 1, characterized in that: The gears are shaken continuously during the quenching process.

4. A quenching device using the gearbox gear quenching method according to claim 1, characterized in that: The invention comprises a quenching box (1), wherein a stirring mechanism (2) and a gear temperature detection mechanism (6) are arranged in the quenching box (1), a sealing cover (3) is arranged on the top of the quenching box (1), a gear support mechanism is arranged on the lower surface of the sealing cover (3), a lifting mechanism (4) is connected to the upper surface of the sealing cover (3), and a first exhaust pipe (5) is arranged on the sealing cover (3); water is arranged in the quenching box (1), and iron powder is arranged in the water.

5. The quenching device according to claim 4, characterized in that: The gear support mechanism comprises a horizontal first crossbeam (7) and a horizontal second crossbeam (8); a plurality of support grooves (9) are arranged between the first crossbeam (7) and the second crossbeam (8); the support grooves (9) comprise a bottom plate (91), two side plates (92) and two end plates (93); the bottom plate (91) is in the shape of an arc with a downward depression in the middle; a plurality of water holes (94) are arranged on the bottom plate (91), the side plates (92) and the end plates (93); and a wavy positioning convex strip (95) is arranged on the inner side wall of the side plate (92); the first crossbeam (7) and the second crossbeam (8) are connected to the sealing cover (3) via a telescopic mechanism (10).

6. The quenching device according to claim 4 or 5, characterized in that: A deaerator box (11) is arranged outside the quenching box (1), and sponge iron suspended particles (12) are arranged in the deaerator box (11). The first exhaust pipe (5) is connected to the bottom of the deaerator box (11), and a detachable top cover (13) is arranged on the top of the deaerator box (11). A water inlet (14), a feeding port (15) and a second exhaust pipe (16) are arranged on the top cover (13), and an openable and closable sealing door (17) is arranged inside the water inlet (14) and the feeding port (15); a cooling box (18) is arranged between the deaerator box (11) and the quenching box (1), and the deaerator box (11), the cooling box (18) and the quenching box (1) are connected in sequence through a water pipe, and a water pump (19) is arranged on the water pipe.

7. The quenching device according to claim 6, characterized in that: The sponge iron suspension particles (12) include hollow particles (121), a sponge iron layer (122) and a coating net (123) which are arranged in sequence from the inside to the outside. The total density of the sponge iron suspension particles (12) is 1-1.1 g / cm 3 .

8. The quenching device according to claim 6, characterized in that: A plurality of heat dissipation pipes (20) are arranged in the cooling box (18) and horizontally penetrate the cooling box (18), and the heat dissipation pipes (20) are connected to a fan (21).

9. The quenching device according to claim 5, characterized in that: The positioning convex strip (95) comprises a connecting convex strip (951), the connecting convex strip (951) is provided with a connecting side wall (952) and a positioning side wall (953), the connecting side wall (952) is fixedly connected to the side plate (92), and a first magnetic attraction strip (954) is embedded in the positioning side wall (953); a second magnetic attraction strip (911) is provided on the upper surface of the bottom plate (91); During quenching, the second magnetic strip (911) supports the tooth top of the gear, and the first magnetic strip (954) positions the two side surfaces of the gear. The second magnetic strip (911) and the first magnetic strip (954) attract iron powder through magnetic force, so that the iron powder is in rapid and full contact with the tooth top and side surfaces of the gear. The generated ferroferric oxide is also attracted by the second magnetic strip (911) and the first magnetic strip (954). After quenching is completed, the iron powder and ferroferric oxide attracted by the second magnetic strip (911) and the first magnetic strip (954) are cleaned.

10. The quenching device according to claim 4, characterized in that: The gear temperature detection mechanism (6) is an infrared thermal imager.

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