A heating device for bearing steel and its heat treatment process

Abstract

The present application relates to a heating device for bearing steel and its heat treatment process, which includes a furnace body, a sliding plate, a sealing door and a linkage rod. A heating cavity for heating materials is provided on the side wall of the furnace body. The sliding plate is slidably connected in the heating cavity along the extending direction of the heating cavity. The sealing door is rotatably connected to the side wall of the furnace body in the vertical direction. One end of the linkage rod is slidably connected to the placement rack along the width direction of the heating cavity, and the other end of the linkage rod is rotatably connected to the end face of the sealing door that abuts against the furnace body. The present application has the effect of reducing the situation where staff are scalded by the furnace body.

Description

Technical Field

[0001] The present application relates to the field of bearing processing, and in particular to a heating device for bearing steel and its heat treatment process. Background Art

[0002] A bearing is an important component in contemporary mechanical equipment. Its main functions are to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotational accuracy.

[0003] Bearing steel is the material for making bearings. Bearing steel has characteristics such as high fatigue strength, high wear resistance, and good rust prevention performance. The characteristics of bearing steel are mainly determined by heat treatment technology. Currently, a box furnace is generally used for heat treating bearing steel.

[0004] Currently, the Chinese utility model patent with the publication number CN210268188U discloses a box furnace, which includes a furnace body and a furnace door. A furnace chamber is provided inside the furnace body, and a furnace liner is provided outside the furnace chamber inside the furnace body. The furnace liner includes a left side plate, a right side plate, a front side plate, a rear side plate, and a bottom plate. A heat preservation cavity for placing a heat preservation layer is formed between the furnace liner and the outer side wall of the furnace chamber; there is a first connecting plate between the upper part of the front side plate and the top plate of the furnace body. A number of rows of heat dissipation holes are provided on the side of the first connecting plate facing the furnace door. The first connecting plate is a special-shaped plate. The lower part of the first connecting plate has a downward flange connected to the front side plate, and the upper part of the first connecting plate has an upward flange for supporting the top plate of the furnace body. By providing an inner liner, it is equivalent to that the furnace body is a double-layer shell, and the heat preservation cavity can be filled with heat preservation cotton or the like to form a heat preservation layer, improving the heat preservation effect.

[0005] Regarding the above related technologies, the inventor believes that there are the following defects: Since the temperature inside the furnace body is relatively high, when the objects inside the furnace body are sintered, when the staff takes out the objects from the furnace body, it is easy to be scalded by the high temperature inside the furnace body. Summary of the Invention

[0006] In order to reduce the situation of the staff being scalded by the furnace body, the present application provides a heating device for bearing steel and its heat treatment process.

[0007] In a first aspect, a heating device for bearing steel provided by the present application adopts the following technical solutions:

[0008] A heating device for bearing steel includes a furnace body, a sliding plate, a sealing door, and a linkage rod. A heating cavity for heating materials is provided on the side wall of the furnace body. The sliding plate is slidably connected in the heating cavity along the extending direction of the heating cavity. The sealing door is rotatably connected to the side wall of the furnace body in the vertical direction. One end of the linkage rod is slidably connected to the sliding plate along the width direction of the heating cavity, and the other end of the linkage rod is rotatably connected to the end face of the sealing door abutting against the furnace body.

[0009] By adopting the above technical solution, the material is placed on the sliding plate and enters the furnace body. After the material is heated in the heating chamber of the furnace body, the staff needs to take out the material from the heating chamber. The staff opens the sealing door. During the opening process of the sealing door, the sealing door drives the linkage rod to move, and the linkage rod drives the sliding plate to move towards the opening of the heating chamber. During the movement of the linkage rod, it will slide on the sliding plate along the width direction of the heating chamber until the sealing door rotates to be perpendicular to the furnace body. At this time, the sliding plate moves away from the heating chamber, and the material on the sliding plate is no longer blocked by the heating chamber, facilitating the staff to clamp the material, enabling the staff to stay as far away from the heating furnace as possible, and reducing the situation of the staff being scalded.

[0010] Optionally, the placing assembly includes a plurality of placing trays and a mounting rack. The mounting rack is arranged on the sliding plate. The plurality of placing trays are distributed vertically. The placing trays are arranged on the mounting rack, and a plurality of through grooves are formed in the placing trays.

[0011] By adopting the above technical solution, the material for making bearing steel is generally rod-shaped. If the bearing steel is directly placed on the sliding plate, during the movement of the sliding plate, the staff cannot master the movement path of the bearing steel, and the staff is prone to being injured; through the placing assembly, the staff can place the material on the placing tray, and there are multiple placing trays, reducing the stacking of materials, reducing the adhesion between adjacent materials during the heating process in the heating furnace, and the through grooves on the placing tray reduce the contact between the material and the placing tray, making the heating of the material in the heating chamber more uniform.

[0012] Optionally, the placing assembly further includes a plurality of sliding rods and a driving member. The placing tray at the highest position is arranged on the mounting rack. The plurality of sliding rods are arranged alternately with the plurality of placing trays. One end of the sliding rod is arranged on one of the adjacent placing trays, and the other end of the sliding rod is slidably connected to another adjacent placing tray along the extending direction of the heating chamber. The driving member is used to drive the placing tray at the lowest position to be slidably connected to the mounting rack along the extending direction of the heating chamber.

[0013] By adopting the above technical solution, a plurality of placing trays are arranged on the sliding plate, which easily causes the placing trays below to be blocked by the placing trays above, resulting in inconvenient placement and removal of materials, poor operation efficiency, and even after the materials are heated, it is easy to cause the materials to collide, resulting in a significant decrease in the quality of the materials; therefore, the placing tray can slide relative to the mounting rack, the driving member is used to drive the placing tray at the lowest position to move, and the sliding rod can drive the placing trays except the one at the highest position to move together. The moving distances of the placing trays are different, forming a stepped arrangement, facilitating the staff to observe the materials in each placing tray and also facilitating the staff to take the materials in the placing tray, ensuring the safety of the staff and reducing the safety hazards of the placing trays.

[0014] Optionally, the driving member includes a first rack, a second rack and a gear. The length direction of the first rack is parallel to the extending direction of the heating chamber. The first rack is slidably connected to the sliding plate along the length direction of the first rack. One end of the first rack is disposed on the placing tray at the lowest position. The gear is rotatably connected to the sliding plate. The gear meshes with the first rack. The second rack is parallel to the first rack. The first rack and the second rack are respectively located on both sides of the gear. The second rack is disposed on the inner side wall of the heating chamber. The second rack is used for meshing with the gear.

[0015] By adopting the above technical solution, during the movement of the sliding plate along with the sealing door, the sliding plate moves relative to the furnace body. The gear on the sliding plate meshes with the second rack in the heating chamber, and the gear rotates. The gear drives the first rack to move. The movement of the first rack drives the placing tray at the bottommost position to move away from the heating chamber relative to the sliding plate. Through the sliding rod, the placing plates except the uppermost placing tray all move away from the heating chamber, so that the placing trays form a stepped arrangement. Through the driving member, during the movement of the sliding plate, the placing tray can move relative to the sliding plate without an additional power source, which is convenient for the staff to operate.

[0016] Optionally, the placing tray at the highest position is rotatably connected to the mounting frame along the width direction of the heating chamber. The driving member further includes a first sliding block and a second sliding block. The first sliding block is disposed on the sliding plate. The height of the first sliding block gradually decreases along the direction from the bottom of the heating chamber to the sealing door. The second sliding block is slidably connected to the upper end surface of the first sliding block. The second sliding block is rotatably connected to the placing tray at the lowest position along the width direction of the heating chamber. The second sliding block is slidably connected to the first rack in the vertical direction.

[0017] By adopting the above technical solution, during the outward sliding of the sliding plate from the heating chamber, the second rack drives the gear to rotate. The gear drives the first rack to move. The first rack pushes the second sliding block to move relative to the first sliding block. Since the height of the first sliding block gradually decreases along the direction from the heating chamber to the sealing door, the height of the second sliding block also gradually decreases. The first sliding block drives the placing tray at the lowest position to rotate. Since the placing tray at the highest position rotates on the mounting frame and the adjacent placing trays are connected by the sliding rod, all the placing trays are inclined. The height of the placing tray gradually decreases along the direction from the heating chamber to the sealing door. The materials in the placing tray will move away from the heating chamber under the action of the inclination of the placing tray, which is convenient for the staff to place and take the materials in the placing tray.

[0018] Optionally, the sealing door is provided with a sealing assembly that is maintained in contact with the furnace body, and the sealing assembly includes a sealing gear, a sealing rack, a sealing block and a rotating disk. The sealing gear is rotatably connected to the sealing door, the sealing rack is slidably connected to the sealing door, the sealing rack is meshed with the sealing gear, the sealing block is arranged on the furnace body, and a clamping groove for clamping the sealing rack is opened on the sealing block. The rotating disk is coaxially arranged with the sealing gear, and the rotating disk is arranged on the sealing gear.

[0019] By adopting the above technical solution, since the temperature inside the furnace body is too high, the furnace body needs to be sealed to reduce the heat escaping from between the furnace body and the sealing door; when the furnace body needs to be heated and the sealing door is closed, the staff will abut the sealing door against the furnace body and rotate the rotating disk, which will drive the sealing gear to rotate, and the sealing gear will drive the sealing rack to slide, and the sealing rack will be clamped into the clamping groove of the sealing block, and the sealing door will remain against the furnace body.

[0020] Optionally, the sealing assembly also includes a locking piece, which includes a locking ring, a locking rod, a locking spring and a turning handle. The locking ring is coaxially arranged with the rotating disk, and the locking ring is arranged on the sealing door. The length direction of the locking rod is parallel to the axial direction of the rotating disk. The locking rod is eccentrically slidingly connected to the rotating disk. A plurality of locking grooves for clamping the locking rod are provided on the side of the locking ring away from the sealing door. The plurality of locking grooves are circumferentially distributed along the axis of the locking ring. The locking spring is used to move the locking rod toward the locking groove. One end of the turning handle is rotatably connected to the locking rod.

[0021] By adopting the above technical solution, when the furnace body is heated, accidental contact with the rotating disk causes the sealing door to open, which poses a threat to the safety of the staff. Therefore, a locking piece is needed to reduce the staff's accidental contact with the rotating disk. The locking rod moves in the direction of the locking ring under the action of the locking spring, and the locking rod is engaged in the locking groove, so that the rotating disk cannot be rotated. When the staff needs to rotate the rotating disk, they need to hold the handle to overcome the elastic force of the locking spring and disengage the locking rod from the locking groove of the locking ring. By turning the handle, the handle can drive the rotating disk to rotate, and the staff's accidental touch is reduced by holding the handle.

[0022] Optionally, the furnace body is provided with a negative pressure component, which includes a negative pressure tube, a negative pressure pump and a negative pressure solenoid valve. The negative pressure pump is arranged on the furnace body, one end of the negative pressure tube is arranged on the negative pressure pump, and the other end of the negative pressure tube is arranged on the furnace body. The negative pressure tube is connected to the furnace body, and the negative pressure solenoid valve is arranged on the negative pressure tube.

[0023] By adopting the above technical solution, when the negative pressure component is used for carbonitriding in the furnace body, it discharges the air in the heating cavity, reduces the original amount of oxygen in the heating cavity, and increases the case depth of the bearing steel.

[0024] Optionally, a jet component is provided on the furnace body. The jet component includes a jet pipe and a jet head. The jet pipe is arranged on the furnace body. One end of the jet pipe is connected to a gas source. The jet pipe penetrates into the furnace body. The jet head is located in the furnace body. The jet head is arranged on the jet pipe, and a plurality of jet holes are formed in the jet head.

[0025] By adopting the above technical solution, the jet component is used to convey a mixed gas composed of nitrogen, helium, and carbon-containing gas into the heating cavity. The plurality of jet holes on the jet head increase the diffusion speed of the mixed gas in the furnace body and improve the working efficiency of carbonitriding of the furnace body.

[0026] In a second aspect, a heat treatment process provided by the present application adopts the following technical solution:

[0027] S1: Pre-clean and dry to remove impurities on the surface of the bearing steel.

[0028] S2: Pre-oxidize to form an oxide layer on the surface of the bearing steel and improve the corrosion resistance of the bearing steel.

[0029] S3: Heat and carbonitride the bearing steel by using the heating device for bearing steel described above.

[0030] S4: Quench to rapidly cool the bearing steel to improve the strength, hardness, and wear resistance of the bearing steel.

[0031] S5: Clean to remove external impurities on the bearing steel and eliminate internal stress, improving the strength and toughness of the material.

[0032] S6: Temper to adjust the hardness and strength of the workpiece so that the bearing steel meets the service performance requirements.

[0033] S7: Rust prevention;

[0034] S8: Packaging.

[0035] In summary, the present application includes at least one of the following beneficial technical effects:

[0036] 1. The linkage rod enables the sliding plate to slide in the heating cavity as the sealing door opens and closes.

[0037] 2. The placement component facilitates heating more bearing steels in the furnace body at one time and reduces the stacking between bearing steels.

[0038] 3. The driving member enables the sliding of several placing trays, facilitating the staff to place and take out the bearing steel in the placing trays;

[0039] 4. The sealing assembly enables the sealing door to seal the heating cavity, reducing the escape of heat inside the furnace body and protecting the safety of the staff. Description of the Drawings

[0040] Figure 1 is a cross-sectional view of the heating device for bearing steel, used to show the internal structure of the furnace body.

[0041] Figure 2 is Figure 1 an enlarged view of part A in

[0042] Figure 3 is Figure 1 a schematic structural view of the placing assembly in

[0043] Figure 4 is Figure 1 a schematic structural view of the negative pressure assembly and the air jet assembly in

[0044] Figure 5 is Figure 1 a cross-sectional view of the sealing door in

[0045] Figure 6 is Figure 5 an enlarged view of part B in

[0046] Reference numerals: 1, furnace body; 11, heating cavity; 2, sliding plate; 3, sealing door; 31, cavity; 4, linkage rod; 41, first connecting rod; 42, second connecting rod; 5, negative pressure assembly; 51, negative pressure pipe; 52, negative pressure pump; 53, negative pressure solenoid valve; 6, air jet assembly; 61, air jet pipe; 62, jet head; 621, jet hole; 7, placing assembly; 71, placing tray; 711, through groove; 72, mounting bracket; 73, sliding rod; 74, driving member; 741, first rack; 742, second rack; 743, gear; 744, first sliding block; 745, second sliding block; 8, sealing assembly; 81, sealing gear; 82, sealing rack; 83, sealing block; 831, clamping groove; 84, rotating disc; 85, locking member; 851, locking ring; 852, locking rod; 853, locking spring; 854, turning handle; 855, abutting piece; 856, locking groove. Detailed Description of the Embodiment

[0047] The following further describes the present application in detail with reference to the Figure 1-6 accompanying drawings.

[0048] The embodiment of the present application discloses a heating device for bearing steel. Refer toFigure 1 and Figure 2 , a heating device for bearing steel includes a furnace body 1, a sliding plate 2, a sealing door 3, a linkage rod 4, a negative pressure assembly 5 and a jet assembly 6. The furnace body 1 is rectangular, the furnace body 1 is vertically arranged, a heating cavity 11 is opened on the side wall of the furnace body 1, the heating cavity 11 extends in the horizontal direction, the sliding plate 2 is horizontally arranged, the sliding plate 2 is slidably connected to the furnace body 1 along the extending direction of the heating cavity 11, a placing assembly 7 for placing materials is arranged on the sliding plate 2, the sealing door 3 is located on one side of the furnace body 1 where the heating cavity 11 is opened, the sealing door 3 is rotatably connected to the furnace body 1 in the vertical direction, and a sealing assembly 8 for sealing the heating cavity 11 is arranged on the sealing door 3. The negative pressure assembly 5 is arranged on the upper end face of the furnace body 1, and the negative pressure assembly 5 is used for extracting air in the heating cavity 11. The jet assembly 6 is arranged on the upper end face of the furnace body 1, and the jet assembly 6 is used for conveying a combined gas composed of nitrogen, helium and carbon-containing gas into the heating cavity 11.

[0049] Referring to Figure 1 and Figure 2 , the linkage rod 4 includes a first connecting rod 41 and a second connecting rod 42. The length direction of the first connecting rod 41 is parallel to the moving direction of the sliding plate 2. One end of the first connecting rod 41 is slidably connected to the side wall of the sliding plate 2 along the width direction of the heating cavity 11. The second connecting rod 42 is horizontally arranged, the second connecting rod 42 is perpendicular to the first connecting rod 41, one end of the second connecting rod 42 is fixedly arranged at the end of the first connecting rod 41 away from the sliding plate 2, and one end of the second connecting rod 42 is rotatably connected to the end face of the sealing door 3 abutted against the furnace body 1.

[0050] Referring to Figure 1 and Figure 3 , the placing assembly 7 includes four placing disks 71, a mounting frame 72, twelve sliding rods 73 and a driving member 74. The mounting frame 72 includes two mounting rods, the two mounting rods are distributed along the width direction of the heating cavity 11, the mounting rods are vertically arranged, the lower end faces of the mounting rods are fixedly arranged on the upper end face of the sliding plate 2. The placing disks 71 are horizontally arranged, the four placing disks 71 are distributed in the vertical direction, the placing disks 71 are located between the two mounting rods, the placing disks 71 are rotatably connected to the two mounting rods along the width direction of the heating cavity 11, a plurality of through grooves 711 are opened on the placing disks 71, the plurality of through grooves 711 are distributed along the width direction of the heating cavity 11, and the through grooves 711 extend along the extending direction of the heating cavity 11. The twelve sliding rods 73 are evenly divided into three groups of sliding members, the three groups of sliding members are staggered with the four placing disks 71, the four sliding rods 73 of a group of sliding members are evenly distributed along the placing disk 71, the sliding rods 73 are vertically arranged, the upper end faces of the sliding rods 73 are fixedly arranged on the lower end faces of the corresponding upper placing disks 71, and the lower end faces of the sliding rods 73 are slidably connected to the upper end faces of the corresponding lower placing disks 71 along the extending direction of the heating cavity 11.

[0051] Referring to Figure 1 andFigure 3 The driving member 74 includes a first rack 741, a second rack 742, a gear 743, a first sliding block 744 and a second sliding block 745. The first sliding block 744 is fixedly arranged on the upper end surface of the sliding plate 2. The upper end surface of the first sliding block 744 is inclined. The height of the first sliding block 744 gradually decreases along the direction from the heating chamber 11 to the sealing door 3. The second sliding block 745 is slidably connected to the upper end surface of the first sliding block 744. The first sliding block 744 is rotatably connected to the side wall of the lowermost placement tray 71 along the width direction of the heating chamber 11. The length direction of the first rack 741 is parallel to the extending direction of the heating chamber 11. The first rack 741 is slidably connected to the sliding plate 2 along the extending direction of the heating chamber 11. The first sliding block 744 is slidably connected to the first rack 741 in the vertical direction. The gear 743 is horizontally arranged. The gear 743 is rotatably connected to the upper end surface of the sliding plate 2. The gear 743 meshes with the first rack 741. The length direction of the second rack 742 is parallel to the length direction of the first rack 741. The second rack 742 and the first rack 741 are respectively located on both sides of the gear 743. The second rack 742 is fixedly arranged on the inner side wall of the heating chamber 11. The second rack 742 is used for meshing with the gear 743.

[0052] Referring to Figure 1 and Figure 4 The negative pressure assembly 5 includes a negative pressure pipe 51, a negative pressure pump 52 and a negative pressure solenoid valve 53. The negative pressure pump 52 is fixedly arranged on the upper end surface of the furnace body 1. One end of the negative pressure pipe 51 is fixedly arranged on the negative pressure pump 52. The other end of the negative pressure pipe 51 is fixedly arranged on the upper end surface of the furnace body 1. The negative pressure pipe 51 communicates with the heating chamber 11. The negative pressure battery valve is fixedly arranged on the negative pressure pipe 51.

[0053] Referring to Figure 1 and Figure 4 The air jet assembly 6 includes an air jet pipe 61 and a jet head 62. One end of the air jet pipe 61 is communicated with a gas source. The other end of the air jet pipe 61 passes through the upper end surface of the furnace body 1. The jet head 62 is located in the heating chamber 11. The jet head 62 is fixedly arranged on the air jet pipe 61. A plurality of jet holes 621 are formed in the jet head 62.

[0054] Referring to Figure 1 and Figure 5The sealing assembly 8 includes a sealing gear 81, two sealing racks 82, two sealing blocks 83, a rotating disk 84 and a locking piece 85. A cavity 31 is provided inside the sealing door 3. The sealing gear 81 is vertically arranged. The sealing gear 81 is rotatably connected to the cavity 31. The sealing rack 82 is vertically arranged. The two sealing racks 82 are respectively located on the two side walls of the sealing gear 81. The sealing rack 82 is slidably connected to the cavity 31. One end of the sealing rack 82 passes through the cavity 31. The sealing rack 82 is meshed with the sealing gear 81. The two sealing blocks 83 correspond to the two sealing racks 82 one by one. The sealing block 83 is provided with a snap-in groove 831 on one side facing the sealing rack 82. The snap-in groove 831 is used to snap-in with the sealing rack 82. The rotating disk 84 is coaxially arranged with the rotating gear 743. The rotating disk 84 is located on the side of the sealing door 3 away from the furnace body 1. The rotating disk 84 is fixedly arranged on the end face of the rotating gear 743.

[0055] Reference Figure 5 and Figure 6 The locking member 85 includes a locking ring 851, a locking rod 852, a locking spring 853, a turning handle 854 and an abutting piece 855. The locking ring 851 is coaxially arranged with the rotating disk 84. The locking ring 851 is located on the side of the sealing door 3 away from the furnace body 1. The locking ring 851 is fixedly arranged on the end surface of the sealing door 3. A plurality of locking grooves 856 are provided on the side of the locking ring 851 away from the sealing door 3. The plurality of locking grooves 856 are evenly distributed along the circumferential direction of the axis of the locking ring 851. The locking grooves 856 extend along the axial direction of the locking ring 851. The length direction of the locking rod 852 is parallel to the axial direction of the rotating disk 84. The locking rod 852 eccentrically slides The abutment piece 855 is connected to the rotating disk 84, and the abutment piece 855 is perpendicular to the locking rod 852. The abutment piece 855 is located between the rotating disk 84 and the locking ring 851. The abutment piece 855 is fixedly set on the locking rod 852. The length direction of the locking spring 853 is parallel to the length direction of the locking rod 852. The locking spring 853 is sleeved on the locking rod 852. One end of the locking spring 853 is fixedly set on the abutment piece 855, and the other end of the locking spring 853 is fixedly set on the rotating disk 84. The turning handle 854 is coaxially arranged with the locking spring 853, and one end of the turning handle 854 is rotatably connected to the end of the locking rod 852 away from the locking ring 851.

[0056] The implementation principle of a heating device for bearing steel in an embodiment of the present application is as follows: the staff first places the materials on the placement plate 71 respectively, and then the staff rotates the sealing door 3, and the sealing door 3 drives the sliding plate 2 to move toward the heating chamber 11 through the first connecting rod 41 and the second connecting rod 42. During this process, the second rack 742 drives the ring gear to rotate, and the ring gear drives the first rack 741 to rotate, and the first rack 741 drives the second sliding block 745 to move. The height of the second sliding block 745 gradually increases under the action of the first sliding block 744, and the placement plate 71 is in a horizontal state, and the placement plate 71 is distributed along the vertical direction.

[0057] Afterwards, the operator pulls the throttle grip 854, and the throttle grip 854 drives the locking lever 852 to move away from the locking groove 856 against the elastic force of the locking spring 853. By turning the throttle grip 854, the throttle grip 854 drives the rotating disc 84 to rotate, the rotating disc 84 drives the sealing gear 81 to rotate, the sealing gear 81 drives the two sealing racks 82 to move, and the sealing racks 82 are engaged with the engaging grooves 831 of the sealing blocks 83 to complete the sealing of the sealing door 3 to the heating chamber 11.

[0058] When carbonitriding is to be carried out in the furnace body 1, the mixed gas of nitrogen, ammonia and carbon-containing gas sequentially enters the heating chamber 11 through the spray pipe 61 and the spray head 62. At this time, the negative pressure assembly 5 is started, the negative pressure solenoid valve 53 is opened, and the negative pressure pump 52 pumps out the air in the heating chamber 11 through the negative pressure pipe 51.

[0059] When all the processes of the materials in the furnace body 1 are completed, the operator pulls the throttle grip 854. The throttle grip 854 drives the rotating disc 84 to rotate, the rotating disc 84 drives the sealing gear 81 to rotate, the sealing gear 81 drives the sealing rack 82 to move away from the sealing block 83. After opening the sealing door 3, the linkage rod 4 drives the sliding plate 2 to slide out of the heating chamber 11. During the movement of the sliding plate 2, the second rack 742 drives the gear 743 to rotate, the gear 743 drives the first rack 741 to move, the first rack 741 drives the second sliding block 745 to slide on the first sliding block 744, and the height of the second sliding block 745 drops, realizing the inclination of the placing plate 71 towards the operator and the stepped distribution of the four placing plates 71, which is convenient for the operator to clamp the materials in the placing plate 71.

[0060] The embodiment of the present application also discloses a heat treatment process, including the following process steps:

[0061] S1: Pre-cleaning and drying, removing impurities on the surface of bearing steel;

[0062] S2: Pre-oxidation, forming an oxide layer on the surface of bearing steel to improve the corrosion resistance of bearing steel;

[0063] S3: Heating and carbonitriding the bearing steel by using the heating device for bearing steel as described above;

[0064] S4: Quenching, quickly cooling the bearing steel to improve the strength, hardness and wear resistance of the bearing steel;

[0065] S5: Cleaning, removing external impurities of the bearing steel and eliminating internal stress to improve the strength and toughness of the material;

[0066] S6: Tempering, adjusting the hardness and strength of the workpiece to make the bearing steel meet the service performance requirements;

[0067] S7: Rust prevention;

[0068] S8: Packaging.

[0069] The above are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A heating device for bearing steel, characterized in that: It includes a furnace body (1), a sliding plate (2), a sealing door (3) and a linkage rod (4). A heating cavity (11) for heating materials is provided on the side wall of the furnace body (1). The sliding plate (2) is slidably connected in the heating cavity (11) along the extension direction of the heating cavity (11). The sealing door (3) is rotatably connected to the side wall of the furnace body (1) in the vertical direction. One end of the linkage rod (4) is slidably connected to the sliding plate (2) along the width direction of the heating cavity (11), and the other end of the linkage rod (4) is rotatably connected to the end face of the sealing door (3) abutting against the furnace body (1); A placing assembly (7) for placing materials is provided on the sliding plate (2). The placing assembly (7) includes a plurality of placing trays (71) and a mounting frame (72). The mounting frame (72) is provided on the sliding plate (2). The plurality of placing trays (71) are distributed in the vertical direction, and the placing trays (71) are provided on the mounting frame (72); The placing assembly (7) further includes a plurality of sliding rods (73) and a driving member (74). The placing tray (71) at the highest position is rotatably connected to the mounting frame (72) along the width direction of the heating cavity (11). The plurality of sliding rods (73) and the plurality of placing trays (71) are arranged alternately. One end of the sliding rod (73) is provided on one of the adjacent placing trays (71), and the other end of the sliding rod (73) is slidably connected to another adjacent placing tray (71) along the extension direction of the heating cavity (11). The driving member (74) is used to drive the placing tray (71) at the lowest position to be slidably connected to the mounting frame (72) along the extension direction of the heating cavity (11); The driving member (74) includes a first rack (741), a second rack (742) and a gear (743). The length direction of the first rack (741) is parallel to the extension direction of the heating cavity (11). The first rack (741) is slidably connected to the sliding plate (2) along the length direction of the first rack (741). One end of the first rack (741) is provided on the placing tray (71) at the lowest position. The gear (743) is rotatably connected to the sliding plate (2). The gear (743) meshes with the first rack (741). The second rack (742) is parallel to the first rack (741). The first rack (741) and the second rack (742) are respectively located on both sides of the gear (743). The second rack (742) is provided on the inner side wall of the heating cavity (11). The second rack (742) is used to mesh with the gear (743);The driving member (74) further includes a first sliding block (744) and a second sliding block (745). The first sliding block (744) is disposed on the sliding plate (2). The height of the first sliding block (744) gradually decreases in the direction from the heating chamber (11) to the sealing door (3). The second sliding block (745) is slidably connected to the upper end surface of the first sliding block (744). The second sliding block (745) is rotatably connected to the placement tray (71) at the lowest position in the width direction of the heating chamber (11). The second sliding block (745) is slidably connected to the first rack (741) in the vertical direction.; 2. The heating device for bearing steel according to claim 1, characterized in that: A plurality of through grooves (711) are formed in the placing tray (71).

3. The heating device for bearing steel according to claim 1, characterized in that: A sealing assembly (8) that abuts against the furnace body (1) is provided on the sealing door (3). The sealing assembly (8) includes a sealing gear (81), a sealing rack (82), a sealing block (83), and a rotating disk (84). The sealing gear (81) is rotatably connected to the sealing door (3). The sealing rack (82) is slidably connected to the sealing door (3). The sealing rack (82) meshes with the sealing gear (81). The sealing block (83) is provided on the furnace body (1). A clamping groove (831) for clamping the sealing rack (82) is formed in the sealing block (83). The rotating disk (84) is coaxially arranged with the sealing gear (81). The rotating disk (84) is provided on the sealing gear (81).

4. The heating device for bearing steel according to claim 3, characterized in that: The sealing assembly (8) further includes a locking member (85). The locking member (85) includes a locking ring (851), a locking rod (852), a locking spring (853), and a turning handle (854). The locking ring (851) is coaxially arranged with the rotating disk (84). The locking ring (851) is provided on the sealing door (3). The length direction of the locking rod (852) is parallel to the axis direction of the rotating disk (84). The locking rod (852) is eccentrically and slidably connected to the rotating disk (84). A plurality of locking grooves (856) for clamping the locking rod (852) are formed on one side of the locking ring (851) facing away from the sealing door (3). The plurality of locking grooves (856) are circumferentially distributed along the axis of the locking ring (851). The locking spring (853) is used to move the locking rod (852) towards the locking groove (856). One end of the turning handle (854) is rotatably connected to the locking rod (852).

5. The heating device for bearing steel according to claim 1, characterized in that: A negative pressure assembly (5) is provided on the furnace body (1). The negative pressure assembly (5) includes a negative pressure pipe (51), a negative pressure pump (52), and a negative pressure solenoid valve (53). The negative pressure pump (52) is provided on the furnace body (1). One end of the negative pressure pipe (51) is provided on the negative pressure pump (52). The other end of the negative pressure pipe (51) is provided on the furnace body (1). The negative pressure pipe (51) communicates with the furnace body (1). The negative pressure solenoid valve (53) is provided on the negative pressure pipe (51).

6. The heating device for bearing steel according to claim 1, characterized in that: An air jetting assembly (6) is provided on the furnace body (1). The air jetting assembly (6) includes an air jetting pipe (61) and a jetting head (62). The air jetting pipe (61) is provided on the furnace body (1). One end of the air jetting pipe (61) is connected to a gas source. The air jetting pipe (61) penetrates into the furnace body (1). The jetting head (62) is located inside the furnace body (1). The jetting head (62) is provided on the air jetting pipe (61). A plurality of jetting holes (621) are formed in the jetting head (62).

7. A heat treatment process, characterized in that: It includes the following technological steps: S1: Pre-clean and dry to remove impurities on the surface of bearing steel. S2: Pre-oxidation, an oxide layer is formed on the surface of the bearing steel to improve the corrosion resistance of the bearing steel; S3: Carbonitriding, heating and carbonitriding the bearing steel by a heating device for a bearing steel according to any one of claims 1-6; S4: Quenching, rapidly cooling the bearing steel to improve the strength, hardness and wear resistance of the bearing steel; S5: Cleaning, removing external impurities of the bearing steel and eliminating internal stress to improve the strength and toughness of the material; S6: Tempering, adjusting the hardness and strength of the workpiece to make the bearing steel meet the service performance requirements; S7: Rust prevention; S8: Packaging.

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