CN112899449B - Heat treatment furnace and heat treatment process using same - Google Patents

Abstract

The application relates to a heat treatment furnace and a heat treatment process using the same, and the heat treatment furnace comprises a rack, wherein a transmission device for driving a piece to be heat treated is arranged on the rack, a preheating device, a heating furnace and a quenching cooling device are sequentially arranged on the rack along the driving direction of the transmission device, the preheating device comprises a plurality of heat recovery pipes, a preheating box, a snakelike preheating pipe and an air pump, the preheating box is arranged on the rack, and the preheating pipe is arranged on the inner wall of the preheating box; one end of each heat recovery pipe is communicated with the heating furnace, the other end of each heat recovery pipe is communicated with the preheating pipe, and the preheating pipe is communicated with an air suction port of the air pump. This application has the effect of recycling the heat.

Description

Heat treatment furnace and heat treatment process using same

Technical Field

The application relates to the field of heat treatment equipment, in particular to a heat treatment furnace and a heat treatment process using the same.

Background

Quenching is heating the steel above the critical temperature, holding the temperature for a certain time, and then cooling at a cooling rate greater than the critical cooling rate, thereby obtaining an unbalanced structure mainly comprising martensite.

Referring to the related art of fig. 1, the heat treatment furnace includes a frame 1, a roller conveyor 11 is provided on the frame 1, a heating furnace 12 and a quenching cooling device 3 are provided on the frame 1 along the transportation direction of the roller conveyor 11, and a placing box is placed on the roller conveyor 11.

When the workpieces are quenched, the workpieces are placed in the placing box, then the workpieces are conveyed to the heating furnace to be heated, and then the heated workpieces are quenched by the quenching cooling device.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: when a plurality of workpieces are heat-treated, heat generated by heating is dispersed in air, resulting in waste of energy.

Disclosure of Invention

In order to reuse heat, the application provides a heat treatment furnace and a heat treatment process applying the heat treatment furnace.

In a first aspect, the application provides a heat treatment furnace, which adopts the following technical scheme:

a heat treatment furnace comprises a rack, wherein a transmission device for driving a piece to be heat treated is arranged on the rack, a preheating device, a heating furnace and a quenching cooling device are sequentially arranged on the rack along the driving direction of the transmission device, the preheating device comprises a plurality of heat recovery pipes, a preheating box, a snake-shaped preheating pipe and an air pump, the preheating box is arranged on the rack, and the preheating pipes are arranged on the inner wall of the preheating box; one end of each heat recovery pipe is communicated with the heating furnace, the other end of each heat recovery pipe is communicated with the preheating pipe, and the preheating pipe is communicated with an air suction port of the air pump.

Through adopting above-mentioned technical scheme, when quenching the work piece, place a plurality of work pieces in placing the case earlier, will place the case afterwards and place on transmission device, transmission device transports a plurality of work pieces and preheats in preheating the case, later heat in getting into the heating furnace, the air pump preheats the work piece through heat recovery pipe and preheating pipe with heat transmission to preheating incasement in with the unnecessary heat of heating process, make unnecessary heat can carry out recycle, the used energy of heating furnace to the work piece heating has been reduced, green.

Optionally, be provided with in the frame and be used for the air cooling device with work piece refrigerated, the air cooling device includes air-cooled pipe and cooling module, air-cooled pipe one end is linked together with the gas outlet of air pump, and the other end setting just is located one side that quenching cooling device deviates from the heating furnace in the frame, cooling module is arranged in cooling the gas in the air-cooled pipe.

Through adopting above-mentioned technical scheme, after a plurality of work pieces cooled rapidly through quenching cooling device, the air pump cools off gas through cooling module after accelerating giving off unnecessary heat on the work piece through air-cooled pipe to blow away the impurity on a plurality of work pieces.

Optionally, the quenching cooling device includes a quenching box for storing brine, an installation frame located in the quenching box, a plurality of first driving cylinders for driving the installation frame to move vertically, a plurality of transmission rollers rotatably connected in the installation frame, a supplementary assembly for supplementing the brine in the quenching box, and a driving assembly for driving the plurality of transmission rollers to rotate together.

Through adopting above-mentioned technical scheme, when cooling off a plurality of work pieces fast, first drive actuating cylinder drive the installing frame and dip in the salt solution, the work piece is cooled off fast along with conveying roller on the installing frame dips in the salt solution, first drive actuating cylinder drive a plurality of work pieces of following rise, drive assembly drives a plurality of work pieces and transports out the incasement that quenches.

Optionally, the drive assembly includes a plurality of first transmission gears, driving motor, a plurality of second transmission gears and third transmission gear, and is a plurality of first transmission gear sets up at the both ends of transmission roller, and is two adjacent be provided with second transmission gear between the first transmission gear, second transmission gear rotates and connects on the installing frame and meshes with two second transmission gears mutually, driving motor sets up on the quenching case, driving motor's output shaft penetrates in the quenching case and is connected with third transmission gear, third transmission gear is used for meshing mutually with second transmission gear.

By adopting the technical scheme, when the conveying rollers need to drive a plurality of workpieces to be conveyed out of the quenching box, the first driving cylinder drives the workpieces to ascend, the second conveying gear is meshed with the third conveying gear, the driving motor drives the third conveying gear to rotate, the third conveying gear drives the second conveying gear and the first conveying gear to rotate, the plurality of conveying rollers are rotated, and the structure is simple.

Optionally, be provided with the pendulous device that is used for driving a plurality of transmission rollers just reversing in the quenching incasement, the pendulous device includes first rack and second rack, first rack and second rack all set up on the quenching incasement wall, first rack is located the second rack top, first rack and second rack are located a plurality of first transmission gear's both sides respectively, first rack and second rack are used for meshing mutually with first transmission gear.

When the first driving cylinder drives the plurality of workpieces to be immersed in the brine, the brine heat near the workpieces rises rapidly, the heat is difficult to transmit, and the effect of rapidly cooling the workpieces is reduced.

Through adopting above-mentioned technical scheme, in carrying out the cooling process rapidly to a plurality of work pieces, first transmission gear and first rack toothing, make a plurality of transmission rollers rotate, a plurality of transmission rollers drive the work piece and remove along the horizontal direction, later first transmission gear and second rack toothing, make a plurality of transmission rollers drive the work piece and remove along the direction just opposite, opposite with above-mentioned process when ascending, realize stirring the salt solution along the horizontal direction when a plurality of work pieces rise the decline, the thermal dispersion in the salt solution has been improved, the cooling effect of salt solution to the work piece has been improved.

Optionally, the supplementary assembly includes a brine barrel, a first water pipe, a second water pipe and a first water pump; one end of the first water pipe is communicated with the quenching box, and the other end of the first water pipe is communicated with the brine barrel; one end of the second water pipe is communicated with the quenching box, the other end of the second water pipe is communicated with the brine barrel, and the first water pump is arranged on the first water pipe.

Through adopting above-mentioned technical scheme, when needs will quench incasement supplementary salt solution, first water pump supplements the water in the salt solution bucket and carries out the heat exchange through first water pipe and second water pipe, has improved the dissolution efficiency of salt in the salt solution bucket, realizes carrying out reuse, green with the heat of quenching incasement salt solution.

Optionally, the cooling module includes a cooling pipe and a second water pump, the cooling pipe is wound on the air cooling pipe, two ends of the cooling pipe are respectively communicated with the brine barrel, and the second water pump is arranged on the cooling pipe.

Through adopting above-mentioned technical scheme, the second water pump cools off the intraductal gas of forced air cooling through the cooling tube of winding on the forced air cooling pipe with the salt solution in the salt solution bucket, and the intraductal gas heat of forced air cooling is taken to the salt solution bucket in, realizes having accelerated the speed that the salt dissolved, realizes thermal reuse, green.

Optionally, be provided with agitating unit on the brine barrel, agitating unit includes agitator motor, connecting rod and stirring vane, agitator motor sets up on the brine barrel and is located the brine barrel top, the connecting rod sets up on agitator motor's output shaft, stirring vane sets up on the connecting rod and is located the brine barrel.

Through adopting above-mentioned technical scheme, when needs stir the salt solution in the salt water bucket and dissolve, agitator motor drives stirring vane and rotates, and stirring vane stirs the salt solution in the salt water bucket, has accelerated the dissolution of salt in the salt water bucket on the one hand, and on the other hand has accelerated giving off of heat in the salt water bucket, accelerates the cooling.

Optionally, two ends of the heating furnace distributed along the workpiece conveying direction are vertically connected with a stop gate in a sliding manner, and a second driving cylinder for driving the stop gate to vertically move is arranged on the rack; the heating furnace is provided with a blocking device, the blocking device comprises an electric telescopic rod, a photoelectric sensor and a blocking plate, the blocking plate is connected to the heat recovery pipe in a sliding mode along the horizontal direction, the blocking plate is used for opening or closing the heat recovery pipe, and the electric telescopic rod is used for driving the blocking plate to slide along the horizontal direction; the photoelectric sensor is arranged on the rack and positioned above the plurality of workpieces, and the photoelectric sensor is electrically connected with the electric telescopic rod.

Through adopting above-mentioned technical scheme, when the heating furnace heats the work piece, stop the door and close, photoelectric sensor control electric telescopic handle realizes being close to the heat recovery pipe with the barrier plate when stopping the door and closing, has reduced the loss of heat in the heating furnace, guarantees the pressure in the stove.

In a second aspect, the bearing heat treatment process provided by the application adopts the following technical scheme:

s1: annealing the bearing: heating the steel piece, and then slowly cooling along with the furnace temperature;

s2: normalizing the bearing: heating the steel part, and cooling at a cooling speed slightly higher than annealing after heat preservation;

s3: quenching the bearing through the heat treatment furnace of the first aspect;

s4: tempering the bearing: heating the quenched steel part, preserving heat, and cooling in air or oil, hot water or water;

s5: tempering the bearing;

s6: oiling a bearing;

s7: and (5) inspecting the bearing and then warehousing.

By adopting the technical scheme, the reutilization of the redundant heat is realized in the bearing quenching process, and the quenching device is green and environment-friendly.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the preheating device is used for recycling redundant heat in the heating furnace, preheating the workpiece, and saving energy and protecting environment;

2. the salt water in the quenching box and the redundant heat in the air cooling pipe are reused through the air cooling device and the supplement assembly, so that the dissolving rate of the salt in the salt water barrel is improved, and the working efficiency is improved;

3. the quenching cooling device and the swinging device improve the cooling rate and effect of the saline water on the workpiece, and improve the working efficiency to a certain extent.

Drawings

Fig. 1 is a schematic structural view of the related art.

Fig. 2 is a schematic structural diagram of a specific embodiment of the present application.

Fig. 3 is a schematic structural view of the application after the preheating box is hidden in fig. 2, and is used for showing the preheating pipe.

Fig. 4 is an enlarged view of fig. 3 a of the present application.

Fig. 5 is a sectional view of the quenching tank in fig. 2 of the present application, for showing the structure of the oscillating device and the quenching cooling device.

FIG. 6 is a partial view of FIG. 2 of the present application showing the structure of the supplemental assembly as well as the cooling assembly.

Fig. 7 is a sectional view of the brine bucket of fig. 6 of the present application for illustrating the structure of the stirring device.

Reference numerals: 1. a frame; 11. a roller conveyor; 12. heating furnace; 121. a blocking door; 122. a second driving cylinder; 13. a blocking device; 131. an electric telescopic rod; 132. a photosensor; 133. a blocking plate; 14. a mounting frame; 2. a preheating device; 21. a heat recovery pipe; 211. a horizontal tube; 212. a vertical square tube; 22. a preheating box; 23. preheating a pipe; 24. an air pump; 3. a quenching cooling device; 31. a quenching box; 32. installing a frame; 33. a first driving cylinder; 34. a transfer roller; 35. a supplementary component; 351. a brine barrel; 352. a first water pipe; 353. a second water pipe; 354. a first water pump; 36. a drive assembly; 361. a first transmission gear; 362. a second transmission gear; 363. a third transmission gear; 364. a drive motor; 4. a swing device; 41. a first rack; 42. a second rack; 5. a stirring device; 51. a stirring motor; 52. a connecting rod; 53. a stirring blade; 54. a cover plate; 6. an air cooling device; 61. an air-cooled pipe; 62. a wind dispersing box; 63. a cooling assembly; 631. a cooling tube; 632. and a second water pump.

Detailed Description

The present application is described in further detail below with reference to figures 2-7.

The embodiment of the application discloses a heat treatment furnace. Referring to fig. 2, the heat treatment furnace comprises a frame 1, wherein a transmission device is arranged on the frame 1, the transmission device comprises a roller conveyor 11, and a preheating device 2, a heating furnace 12 and a quenching cooling device 3 are sequentially arranged on the frame 1 along the conveying direction of the roller conveyor 11.

Referring to fig. 2 and 3, the preheating device 2 includes a plurality of heat recovery pipes 21, a preheating tank 22, a serpentine preheating pipe 23, and an air pump 24; the preheating box 22 is fixedly connected to the frame 1, and the preheating pipe 23 is fixedly connected to the inner top wall of the preheating box 22; the heat recovery pipe 21 comprises a horizontal pipe 211 and a plurality of vertical square pipes 212, the vertical square pipes 212 are parallel to each other along the length direction of the heating furnace 12, the lower ends of the vertical square pipes 212 are communicated with the upper surface of the heating furnace 12, the horizontal pipe 211 is positioned above the heating furnace 12, the vertical square pipes 212 are communicated with the horizontal pipe 211, and one end, close to the preheating box 22, of the horizontal pipe 211 is communicated with the preheating pipe 23; the air pump 24 is fixedly connected to the side wall of the preheating furnace 12, and one end of the preheating pipe 23 far away from the horizontal pipe 211 is communicated with an air inlet of the air pump 24.

Referring to fig. 2 and 3, the heating furnace 12 is fixedly connected to the frame 1, two ends of the heating furnace 12, which are distributed along the transportation direction of the roller conveyor 11, are vertically slidably connected to a stop gate 121, two second driving cylinders 122 are fixedly connected to the upper surface of the heating furnace 12, the two second driving cylinders 122 are vertically arranged, and piston rods of the two second driving cylinders 122 are fixedly connected to the upper surface of the stop gate 121.

Referring to fig. 2 and 4, a blocking device 13 is arranged at a connection position of the heating furnace 12 and the horizontal pipe 211, the blocking device 13 includes an electric telescopic rod 131, a photoelectric sensor 132 and a blocking plate 133, the photoelectric sensor 132 is arranged on the frame 1 and located above the plurality of bearings, and the photoelectric sensor 132 is used for detecting a closing or opening state of the blocking door 121; the blocking plate 133 is connected to the vertical square pipe 212 in a sliding manner along the width direction of the roller conveyor 11, and the blocking plate 133 is used for opening or closing the vertical square pipe 212; electric telescopic handle 131 fixed connection is on heating furnace 12 upper surface, and electric telescopic handle 131 length direction is parallel with roller conveyer 11 width direction, and electric telescopic handle 131's piston rod and barrier plate 133 fixed connection, electric telescopic handle 131 is connected with photoelectric sensor 132 electricity.

Referring to fig. 2 and 5, the quenching cooling device 3 includes a quenching box 31, a mounting frame 32, two first driving cylinders 33, a plurality of conveying rollers 34, a supplement assembly 35 and a driving assembly 36, the quenching box 31 is fixedly connected to the frame 1, and the bottom inside the quenching box 31 is used for storing brine; two first drive the vertical setting of actuating cylinder 33, two first equal fixed connection of actuating cylinder 33 that drive are at quenching case 31 roof, and two first piston rods that drive actuating cylinder 33 all penetrate quenching case 31 in, and installing frame 32 is located quenching case 31 and level setting, and fixed surface connects on the installing frame 32 on two first piston rods that drive actuating cylinder 33.

Referring to fig. 2 and 5, two ends of a plurality of transmission rollers 34 are rotatably connected to the inner side wall of the mounting frame 32, and the length direction of the transmission rollers 34 is parallel to the width direction of the roller conveyor 11; the driving assembly 36 includes a plurality of first transmission gears 361, a driving motor 364, a plurality of second transmission gears 362 and a third transmission gear 363, the plurality of first transmission gears 361 are coaxially and fixedly connected to two ends of the transmission roller 34, the first transmission gears 361 are located at the outer side of the mounting frame 32, a second transmission gear 362 is arranged between every two adjacent first transmission gears 361, the second transmission gears 362 are rotatably connected to the outer side wall of the mounting frame 32, and the second transmission gears 362 are engaged with the two first transmission gears 361; the driving motor 364 is fixedly connected to the outer side wall of the quenching box 31, and an output shaft of the driving motor 364 penetrates into the quenching box 31; the third transmission gear 363 is coaxially and fixedly connected to an output shaft of the driving motor 364, the third transmission gear 363 is configured to be engaged with one of the second transmission gears 362, and the third transmission gear 363 is located above the second transmission gear 362.

Referring to fig. 2 and 5, a swinging device 4 for driving the plurality of conveying rollers 34 to rotate forward and backward is arranged in the quenching box 31, the swinging device 4 includes a first rack 41 and a second rack 42 which are both vertically arranged, the first rack 41 and the second rack 42 are fixedly connected to the inner side wall of the quenching box 31, the first rack 41 is located above the second rack 42, and the first rack 41 and the second rack 42 are sequentially distributed along the conveying direction of the roller conveyor 11; the first rack 41 is adapted to be engaged with the first transfer gear 361 near the heating furnace 12, and the second rack 42 is adapted to be engaged with the first transfer gear 361 far from the heating furnace 12.

Referring to fig. 2 and 6, the supplementary assembly 35 includes a brine tub 351, a first water pipe 352, a second water pipe 353, and a first water pump 354; one end of the first water pipe 352 is communicated with the quenching tank 31, and the other end is communicated with the brine barrel 351; one end of the second water pipe 353 is communicated with the quenching tank 31, and the other end is communicated with the brine barrel 351; the first water pump 354 is provided on the first water pipe 352.

Referring to fig. 6 and 7, be provided with agitating unit 5 on the brine bucket 351, agitating unit 5 includes agitator motor 51, connecting rod 52 and stirring vane 53, fixed surface is connected with apron 54 on the brine bucket 351, agitator motor 51 fixed connection is at the apron 54 upper surface, agitator motor 51's output shaft penetrates in the brine bucket 351, the vertical setting of connecting rod 52, the coaxial fixed connection in agitator motor 51's of connecting rod 52 upper end output shaft, stirring vane 53 level sets up, stirring vane 53 fixed connection is at the lower extreme of connecting rod 52.

Referring to fig. 2 and 6, an air cooling device 6 is arranged on the frame 1, a mounting frame 14 is fixedly connected to the upper surface of the frame 1, the mounting frame 14 is located on one side of the quenching box 31 away from the heating furnace 12, and the air cooling device 6 comprises an air cooling pipe 61, an air dispersing box 62 and a cooling assembly 63; the air dispersing box 62 is fixedly connected to the mounting frame 14 and located above the roller conveyor 11, and a plurality of air dispersing through holes are formed in the bottom surface of the air dispersing box 62; one end of the air-cooling pipe 61 is communicated with the air outlet of the air pump 24, and the other end is communicated with the upper surface of the air-dispersing box 62.

Referring to fig. 2 and 6, the cooling module 63 includes a cooling pipe 631 and a second water pump 632, the cooling pipe 631 is wound around the air cooling pipe 61, both ends of the cooling pipe 631 are respectively communicated with the brine tank 351, and the second water pump 632 is fixedly connected to the cooling pipe 631.

The implementation principle of the heat treatment furnace in the embodiment of the application is as follows: when quenching a plurality of bearings, operating personnel will place a plurality of bearings and place the incasement, will place the case afterwards and place on roller conveyer 11, roller conveyer 11 will place the case and carry to preheating in the case 22, preheating pipe 23 preheats a plurality of work pieces in preheating the case 22, has reduced the temperature that the work piece need promote in heating furnace 12, has reduced the consumption of energy, green.

Then the roller conveyor 11 drives a plurality of workpieces to enter the heating furnace 12, the second driving cylinder 122 drives the blocking door 121 to vertically move downwards, two ends of the heating furnace 12 are closed, the heating furnace 12 blocks the photoelectric sensor 132, the photoelectric sensor 132 controls the electric telescopic rod 131 to drive the blocking plate 133 to slide into the vertical square tube 212, the blocking plate 133 closes the vertical square tube 212, loss of temperature in the heating furnace 12 is reduced, after heating is completed, the second driving cylinder 122 drives the blocking door 121 to vertically move upwards, two ends of the heating furnace 12 are opened, the photoelectric sensor 132 receives an electric signal, the electric telescopic rod 131 is controlled to drive the blocking plate 133 to slide out of the vertical square tube 212, the air pump 24 is started, the air pump 24 brings redundant heat in the heating furnace 12 into the preheating box 22 through the heat recovery tube 21 and the preheating tube 23, and preheating of the plurality of subsequent workpieces is achieved.

Roller conveyer 11 drives a plurality of bearings and transports on a plurality of transmission roller 34 on installing frame 32, first drive actuating cylinder 33 drives installing frame 32 and a plurality of bearing and immerses in the salt solution, in the descending process, first transmission gear 361 and first rack 41 mesh mutually, a plurality of first transmission gear 361 and a plurality of second transmission gear 362 drive a plurality of transmission roller 34 and rotate, thereby realize moving a plurality of work pieces along roller conveyer 11 direction of transportation, later first transmission gear 361 and second rack 42 mesh, thereby realize moving a plurality of work pieces along the opposite direction of roller conveyer 11 direction of transportation, in the ascending process and the motion in the descending process are opposite, realize making a plurality of bearings stir the salt solution in the ascending and descending process, the cooling of salt solution to a plurality of bearings is improved.

After the mounting frame 32 rises, the second transmission gear 362 is engaged with the third transmission gear 363, the driving motor 364 drives the third transmission gear 363 to rotate, and the third transmission gear 363 drives the first transmission gear 361 and the second transmission gear 362 to rotate, so that the transmission rollers 34 drive the bearings to be transported to the position right below the air dispersing box 62.

The gas discharged from the gas outlet of the air pump 24 is cooled by the cooling assembly 63, the heat of the gas discharged from the gas outlet of the air pump 24 is transmitted into the brine barrel 351, and the gas in the air cooling pipe 61 is transmitted into the air dispersing box 62 and air-cools a plurality of workpieces right below the air dispersing box 62; the replenishing assembly 35 replenishes the brine in the brine bucket 351 into the quenching box 31, so that the heat of the brine in the quenching box 31 is transferred into the brine bucket 351; stirring motor 51 and stirring vane 53 stir and cool down the salt solution in the salt water bucket 351 for the dissolution rate of salt in the salt water bucket 351, improved the efficiency of work at a certain extent.

The embodiment of the application also discloses a bearing heat treatment process, which comprises the following steps:

s1: annealing the bearing: heating the steel piece, and then slowly cooling along with the furnace temperature;

s2: normalizing the bearing: heating the steel part, and cooling at a cooling speed slightly higher than annealing after heat preservation;

s3: quenching the bearing through the heat treatment furnace;

s4: tempering the bearing: heating the quenched steel part, preserving heat, and cooling in air or oil, hot water or water;

s5: tempering the bearing;

s6: oiling the bearing;

s7: and (5) inspecting the bearing and then warehousing.

The heat treatment furnace realizes reutilization of redundant heat in the bearing quenching process, and is green and environment-friendly.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (6)

1. A heat treatment furnace is characterized in that: the device comprises a rack (1), wherein a transmission device for driving a piece to be heat treated is arranged on the rack (1), a preheating device (2), a heating furnace (12) and a quenching cooling device (3) are sequentially arranged on the rack (1) along the driving direction of the transmission device, the preheating device (2) comprises a plurality of heat recovery pipes (21), a preheating box (22), a snakelike preheating pipe (23) and an air pump (24), the preheating box (22) is arranged on the rack (1), and the preheating pipe (23) is arranged on the inner wall of the preheating box (22); one end of each heat recovery pipe (21) is communicated with the heating furnace (12), the other end of each heat recovery pipe is communicated with the preheating pipe (23), and the preheating pipe (23) is communicated with an air suction port of the air pump (24);

the quenching cooling device is characterized in that an air cooling device (6) for cooling a workpiece is arranged on the rack (1), the air cooling device (6) comprises an air cooling pipe (61) and a cooling assembly (63), one end of the air cooling pipe (61) is communicated with an air outlet of the air pump (24), the other end of the air cooling pipe is arranged on the rack (1) and is positioned on one side, away from the heating furnace (12), of the quenching cooling device (3), and the cooling assembly (63) is used for cooling air in the air cooling pipe (61);

the quenching cooling device (3) comprises a quenching box (31) for storing saline water, an installation frame (32) positioned in the quenching box (31), a plurality of first driving cylinders (33) for driving the installation frame (32) to vertically move, a plurality of transmission rollers (34) rotatably connected in the installation frame (32), a supplementing assembly (35) for supplementing the saline water in the quenching box (31) and a driving assembly (36) for driving the transmission rollers (34) to rotate together;

the driving assembly (36) comprises a plurality of first transmission gears (361), a driving motor (364), a plurality of second transmission gears (362) and a third transmission gear (363), the plurality of first transmission gears (361) are arranged at two ends of the transmission roller (34), the second transmission gear (362) is arranged between two adjacent first transmission gears (361), the second transmission gear (362) is rotatably connected to the mounting frame (32) and meshed with the two second transmission gears (362), the driving motor (364) is arranged on the quenching box (31), an output shaft of the driving motor (364) penetrates into the quenching box (31) and is connected with the third transmission gear (363), and the third transmission gear (363) is used for being meshed with the second transmission gear (362);

the quenching device is characterized in that a swinging device (4) used for driving a plurality of transmission rollers (34) to rotate positively and negatively is arranged in the quenching box (31), the swinging device (4) comprises a first rack (41) and a second rack (42), the first rack (41) and the second rack (42) are arranged on the inner wall of the quenching box (31), the first rack (41) is located above the second rack (42), the first rack (41) and the second rack (42) are located on two sides of a plurality of first transmission gears (361) respectively, and the first rack (41) and the second rack (42) are used for being meshed with the first transmission gears (361).

2. The heat treatment furnace according to claim 1, wherein: the replenishing assembly (35) includes a brine tank (351), a first water pipe (352), a second water pipe (353), and a first water pump (354); one end of the first water pipe (352) is communicated with the quenching box (31), and the other end of the first water pipe is communicated with the brine barrel (351); one end of the second water pipe (353) is communicated with the quenching box (31), the other end of the second water pipe is communicated with the brine barrel (351), and the first water pump (354) is arranged on the first water pipe (352).

3. A heat treatment furnace according to claim 2, wherein: the cooling assembly (63) comprises a cooling pipe (631) and a second water pump (632), the cooling pipe (631) is wound on the air cooling pipe (61), two ends of the cooling pipe (631) are respectively communicated with the brine barrel (351), and the second water pump (632) is arranged on the cooling pipe (631).

4. A heat treatment furnace according to claim 3, wherein: be provided with agitating unit (5) on brine barrel (351), agitating unit (5) are including agitator motor (51), connecting rod (52) and stirring vane (53), agitator motor (51) set up on brine barrel (351) and are located brine barrel (351) top, connecting rod (52) set up on the output shaft of agitator motor (51), stirring vane (53) set up on connecting rod (52) and are located brine barrel (351).

5. The heat treatment furnace according to claim 1, wherein: two ends of the heating furnace (12) distributed along the workpiece conveying direction are vertically connected with a stop gate (121) in a sliding manner, and a second driving cylinder (122) for driving the stop gate (121) to vertically move is arranged on the rack (1); the heating furnace (12) is provided with a blocking device (13), the blocking device (13) comprises an electric telescopic rod (131), a photoelectric sensor (132) and a blocking plate (133), the blocking plate (133) is connected to the heat recovery pipe (21) in a sliding mode along the horizontal direction, the blocking plate (133) is used for opening or closing the heat recovery pipe (21), and the electric telescopic rod (131) is used for driving the blocking plate (133) to slide along the horizontal direction; photoelectric sensor (132) set up in frame (1) and be located a plurality of work pieces tops, photoelectric sensor (132) are connected with electric telescopic handle (131) electricity.

6. The bearing heat treatment process is characterized by comprising the following process steps:

s1: annealing the bearing: heating the steel piece, and then slowly cooling along with the furnace temperature;

s2: normalizing the bearing: heating the steel part, and cooling at a cooling speed slightly higher than annealing after heat preservation;

s3: quenching the bearing by the heat treatment furnace as claimed in any one of claims 1 to 5;

s4: tempering the bearing: heating the quenched steel part, preserving heat, and cooling in air or oil, hot water or water;

s5: tempering the bearing;

s6: oiling the bearing;

s7: and (5) inspecting the bearing and then warehousing.

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