Heat treatment system and process for a ferritic stainless steel

Abstract

The application discloses a heat treatment system and process of ferrite stainless steel; the system comprises a rack, a feeding frame, two groups of air cooling devices and a driving mechanism; the feeding frame is translationally installed on the rack, and a plurality of feeding stations for placing steel coils are arranged on the feeding frame; the two groups of air cooling devices are arranged on the two sides of the rack respectively; every two adjacent air cooling devices of each group are spaced apart by one feeding station, and the two groups of air cooling devices are staggered along the arrangement direction; the driving mechanism is installed on the feeding frame, and the driving mechanism is suitable for driving the feeding frame to reciprocally move along the rack. The process steps comprise raw material rolling, alkali washing treatment, drying treatment, annealing treatment and cooling treatment by using the system. The application has the beneficial effects that: through the reciprocating movement of the feeding frame along the rack, the two air cooling devices can cool the steel coil along the two side directions respectively; compared with the traditional fixed position cooling, the application can not only ensure the uniform cooling of the steel coil, but also improve the cooling efficiency of the steel coil.

Description

Technical Field

[0001] This application relates to the field of metal parts processing technology, and in particular to a heat treatment system and process for ferritic stainless steel. Background Technology

[0002] Ferritic stainless steel is relatively inexpensive due to its nickel-free matrix and excellent corrosion resistance. Therefore, it is widely used, primarily in decorative materials, outdoor advertising displays, electronic products, tableware, and household appliances. In these applications, ferritic stainless steel is typically produced by precision stamping of thin ferritic stainless steel strips. The heat treatment process of ferritic stainless steel directly affects its stamping performance.

[0003] Existing heat treatment processes for ferritic stainless steel mainly include the following steps: raw material rolling, alkaline washing, drying, annealing, and cooling. Air cooling is a commonly used cooling method for ferritic stainless steel. However, existing air cooling processes have the following drawbacks:

[0004] (1) The direction of air cooling is singular, which makes the cooling effect of the coiled ferritic stainless steel on the side away from the air cooling source poor, resulting in uneven cooling of the ferritic stainless steel as a whole.

[0005] (2) The fixed air-cooling position of the coiled ferritic stainless steel makes it impossible for some parts of the coiled ferritic stainless steel to be air-cooled due to the influence of the placement position.

[0006] (3) The air cooling range of the air cooling source is generally fixed. The air cooling position of ferritic stainless steel coils of different diameters is different, which makes the local air cooling effect of ferritic stainless steel poor. Summary of the Invention

[0007] One objective of this application is to provide a heat treatment system for ferritic stainless steel that can solve at least one of the defects in the aforementioned background art.

[0008] Another objective of this application is to provide a heat treatment process for ferritic stainless steel that can provide excellent stamping performance.

[0009] To achieve the above objectives, the technical solution adopted in this application is as follows: a heat treatment system for ferritic stainless steel, comprising a frame, a loading rack, two sets of air-cooling devices, and a drive mechanism; the loading rack is slidably installed on the frame, and the loading rack is provided with multiple loading stations for placing steel coils to be cooled; the two sets of air-cooling devices are respectively arranged on both sides of the frame; each set of two adjacent air-cooling devices is spaced apart by one loading station, and the two sets of air-cooling devices are staggered along the arrangement direction, so that in the adjacent loading stations, one loading station is aligned with the air-cooling device of the first set through a first side, and the other loading station is aligned with the air-cooling device of the second set through a second side; the drive mechanism is installed on the loading rack, and the drive mechanism is adapted to drive the loading rack to reciprocate along the frame, thereby driving the steel coils on the loading stations to be cooled by the air-cooling devices of the two sets respectively through the first side and the second side.

[0010] Preferably, each of the loading stations is equipped with a support assembly, which has a support area for placing the steel coils to be cooled. The drive mechanism cooperates with the support assembly. When steel coils of different diameters are being cooled, the drive mechanism is adapted to drive the support assembly to move the support area vertically through a first action, so that when steel coils of different diameters are placed in the support area, the center of the steel coil is aligned with the center of the air-cooling device. During this process, the loading rack remains stationary. During the air-cooling process, the drive mechanism is adapted to drive the loading rack and the support assembly to reciprocate synchronously through a second action. During this process, the support assembly remains stationary in the vertical direction.

[0011] Preferably, the support assembly includes a pair of support rollers, two pairs of support plates, and a fixed roller; the fixed roller is fixedly installed at the feeding station; the two support rollers are located on both sides above the fixed roller to form the support area; the two pairs of support plates are respectively located at both ends of the fixed roller, the two support plates of each pair are cross-arranged and hinged to the fixed roller at the middle, and the two support plates of each pair are connected to the ends of the two support rollers on the same side at their upper ends; the lower ends of the two support plates of each pair cooperate with the drive mechanism through a traction assembly, so that under the first action of the drive mechanism, the support plates drive the two support rollers to rotate around the fixed roller in opposite directions or in opposite directions, thereby changing the height of the support area in the vertical direction.

[0012] Preferably, the drive mechanism includes a motor, a first transmission assembly, and a second transmission assembly; the output shaft of the motor is respectively mounted with a first transmission component and a second transmission component via one-way bearings; the first transmission component is adapted to connect with the input end of the first transmission assembly, and the output end of the first transmission assembly cooperates with the traction assembly; the second transmission component is adapted to connect with the input end of the second transmission assembly, and the output end of the second transmission assembly is adapted to cooperate with the frame; when the motor performs a first forward rotation, the first transmission component is adapted to drive the traction assembly to adjust the height of the support area through the first transmission assembly, during which the one-way bearing cooperating with the second transmission component is in a free state; when the motor performs a second reverse rotation, the second transmission component is adapted to cooperate with the frame through the second transmission assembly, thereby driving the loading rack to reciprocate relative to the frame, during which the one-way bearing cooperating with the first transmission component is in a free state.

[0013] Preferably, the first transmission assembly includes a transmission shaft and a plurality of worm gears; the transmission shaft is rotatably mounted on the lower part of the loading rack along the length direction of the loading rack; the worm gears are rotatably mounted on the loading rack via a first rotating shaft and located below the fixed roller; the transmission shaft is adapted to cooperate with the worm gears via a worm segment; the first rotating shaft cooperates with the traction assembly; when the motor rotates in the forward direction, the first transmission component is adapted to drive the transmission shaft to rotate, so that the transmission shaft drives the worm gears together with the first rotating shaft to rotate via the worm segment, thereby driving the traction assembly to adjust the height of the support area.

[0014] Preferably, the traction assembly includes a traction plate and a driving component; the traction plate is vertically slidably mounted on the frame, and both sides of the traction plate are respectively connected to the lower ends of the corresponding support plates; the driving component is mounted on the first rotating shaft, and the driving component and the traction plate are connected through a traction structure, so that during the rotation of the first rotating shaft, the driving component is adapted to drive the traction plate to drive the lower ends of the support plates to rotate around the fixed roller in opposite directions or in opposite directions through the traction structure.

[0015] Preferably, a pair of rack plates are fixed in parallel on the frame; the second transmission component is an incomplete gear; the second transmission assembly includes a pair of gear sets; the gear sets are symmetrically mounted on the loading rack around the output shaft, and the two gear sets mesh with the rack plates on the corresponding sides through their output ends; when the motor rotates in the opposite direction, the second transmission component is adapted to mesh with the input ends of the two gear sets successively through its toothed segments, so that the gear sets drive the loading rack to reciprocate along the frame by meshing with the rack plates on the corresponding sides in sequence.

[0016] Preferably, the support roller is rotatably connected to the upper end of the support plate; at least one end of at least one support roller in the support assembly is engaged with the frame through a rotating assembly, so that during the reciprocating movement of the feeding rack along the frame, the support roller rotates unidirectionally around the upper end of the support plate under the drive of the rotating assembly, thereby driving the steel coil placed in the support area to rotate at a set angle.

[0017] Preferably, at least one side of the frame is provided with a plurality of third rack plates corresponding to the feeding station, and the feeding frame is rotatably mounted with a second rotating shaft below the fixed roller; the rotating assembly includes a first connecting plate, a second connecting plate, and a third gear; the third gear is rotatably mounted on the second rotating shaft via a one-way bearing; the first connecting plate and the second connecting plate are hinged to each other at one end, the other end of the first connecting plate is hinged to the support roller, and the other end of the second connecting plate is hinged to the second rotating shaft; the first connecting plate is parallel and its length is equal to the line connecting the fixed roller and the second rotating shaft, and the second connecting plate is parallel and its length is equal to the line connecting the fixed roller and the second rotating shaft. The fixed roller is connected to the support roller by a line; the hinge positions of the support roller, the first connecting plate, and the second connecting plate, as well as the second rotating shaft, are connected by a belt drive or a chain drive; when the support assembly adjusts the height of the support area, the first connecting plate, the second connecting plate, the line connecting the fixed roller and the second rotating shaft, and the line connecting the fixed roller and the support roller form a parallelogram structure to maintain the tension of the belt drive or chain drive; during the movement of the loading rack, the third gear is adapted to mesh unidirectionally with the third rack plate, thereby driving the support roller to rotate a set number of revolutions via a belt drive or chain drive.

[0018] Preferably, the lower end of the feeding rack is equipped with multiple rollers; the feeding rack is adapted to reciprocate along the frame by means of the rollers.

[0019] Preferably, the frame is provided with a feeding area and a clearance area along its extension direction; the air-cooling device is slidably mounted on the frame, and the feeding rack is installed in the feeding area and reciprocates within the feeding area; when feeding or unloading steel coils, the air-cooling device is adapted to slide from the feeding area to the clearance area until multiple air-cooling devices in each group are close together within the clearance area.

[0020] A heat treatment process for ferritic stainless steel includes the following steps:

[0021] S1: Raw material rolling, which rolls steel billets to a set thickness and forms steel coils;

[0022] S2: Alkaline washing treatment, the steel coil of the set thickness obtained in step S1 is put into an alkaline washing machine for cleaning.

[0023] S3: Drying treatment, the steel coils after alkaline washing in step S2 are placed into a dryer for drying;

[0024] S4: Annealing treatment, the steel coil dried in step S3 is placed in a horizontal annealing furnace for annealing at a set temperature and time.

[0025] S5: Cooling treatment. The steel coil annealed in step S4 is placed into the above-mentioned heat treatment system for ferritic stainless steel for cooling.

[0026] Compared with the prior art, the beneficial effects of this application are as follows:

[0027] During the cooling process of the steel coil, the loading rack is driven by the drive mechanism to move back and forth along the frame, so that the steel coil located at the loading station can pass through two air cooling devices. The two air cooling devices can cool the steel coil in both directions respectively. Compared with the traditional fixed position cooling, this application can not only ensure the uniform cooling of the steel coil, but also improve the cooling efficiency of the steel coil. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the invention from a top-down view. Figure 1 .

[0030] Figure 3 This is a schematic diagram of the invention from a top-down view. Figure 2 .

[0031] Figure 4 This is a schematic diagram of the structure of the support components and drive mechanism installed on the loading rack in this invention.

[0032] Figure 5 This is a schematic diagram of the drive mechanism in this invention.

[0033] Figure 6 This is a schematic diagram of the support component in this invention.

[0034] Figure 7 This is a partial structural diagram of one embodiment of the traction component in this invention, showing its cooperation with the support component.

[0035] Figure 8 For the present invention Figure 7 A magnified schematic diagram of part A in the middle.

[0036] Figure 9This is a partial structural diagram of another embodiment of the traction component in this invention, showing its cooperation with the support component.

[0037] Figure 10 This is a schematic diagram illustrating the state of cooperation between the drive mechanism and the frame in this invention. Figure 1 .

[0038] Figure 11 This is a schematic diagram illustrating the state of cooperation between the drive mechanism and the frame in this invention. Figure 2 .

[0039] Figure 12 Schematic diagram of the cooperation state between the rotating component and the frame in this invention. Figure 1 .

[0040] Figure 13 Schematic diagram of the cooperation state between the rotating component and the frame in this invention. Figure 2 .

[0041] Figure 14 A partial structural diagram of the rolling cooperation between the feeding rack and the machine frame in this invention.

[0042] Figure 15 This is a schematic diagram showing the state of the steel coil during the feeding process of this invention.

[0043] In the diagram: Frame 100, Loading area 110, Clearance area 120, First rack plate 130, Second rack plate 140, Third rack plate 150, Loading rack 200, Loading station 210, Drive shaft 220, Worm gear section 221, Steel coil 300, Air cooling device 400, Drive mechanism 5, Motor 51, Output shaft 511, First transmission component 52, Second transmission component 53, Gear set 54, First gear 541, Second gear 542, Support Component 6, support roller 61, support plate 62, first traction groove 620, fixed roller 63, worm gear 64, first rotating shaft 641, missing gear 642, crank 643, mounting bracket 65, traction plate 66, clearance groove 660, first rack segment 661, second rack segment 662, second traction groove 663, hinge plate 67, rotating assembly 7, first connecting plate 71, second connecting plate 72, second rotating shaft 73, third gear 74, roller 800. Detailed Implementation

[0044] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0045] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0046] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0047] One aspect of this application provides a heat treatment system for ferritic stainless steel, such as Figures 1 to 3 As shown, one preferred embodiment includes a frame 100, a loading rack 200, two sets of air-cooling devices 400, and a drive mechanism 5. The loading rack 200 can be slidably installed on the frame 100. The loading rack 200 is provided with multiple loading stations 210 for placing steel coils 300 to be cooled. Sufficient clearance must be maintained between adjacent loading stations 210 to avoid interference when placing the steel coils 300. The two sets of air-cooling devices 400 are respectively arranged on both sides of the frame 100, and the air-cooling devices 400 face the loading stations 210. There is a gap of one loading station 210 between two adjacent air-cooling devices 400 in each set, and the two sets of air-cooling devices 400 are staggered along the arrangement direction, so that one of the adjacent loading stations 210 is aligned with the air-cooling device 400 of the first set through a first side, and the other loading station 210 is aligned with the air-cooling device 400 of the second set through a second side. The drive mechanism 5 is installed on the feeding rack 200. The drive mechanism 5 can drive the feeding rack 200 to move back and forth along the frame 100, thereby driving the steel coil 300 on the feeding station 210 to be cooled by the two sets of air-cooling devices 400 on the first side and the second side respectively.

[0048] Understandably, when cooling the steel coil 300, a cooling device 400 is typically installed on one side of the coil 300. This allows the cooling device 400 to exhaust air from one end of the coil 300 to the other, forming a unidirectional cooling channel and ensuring effective cooling. However, because the steel coil 300 is a ring-shaped structure with a certain thickness, the cool airflow from the cooling device 400 is blocked by the end face of the coil 300 when it passes one end. This can easily lead to poor cooling at the other end of the coil 300.

[0049] In this application, multiple air-cooling devices 400 are divided into two groups, namely the first group and the second group mentioned above. The two groups of air-cooling devices 400 are respectively arranged on both sides of the loading station 210, and in the extension direction of the frame 100, two adjacent air-cooling devices 400 are respectively located on both sides of the frame 100 and facing different directions of the two adjacent loading stations 210. Thus, during the cooling process of the steel coil 300, the drive mechanism 5 can drive the loading rack 200 together with the placed steel coil 300 to reciprocate along the frame 100 by the distance of one loading station 210. During the reciprocating movement, the steel coil 300 located on the loading station 210 can first be cooled in the first direction (from the first end of the steel coil 300 to the second end) with the corresponding air-cooling device 400 in one group; then it moves to align with the corresponding air-cooling device 400 in the other group to be cooled in the second direction (from the second end of the steel coil 300 to the first end). Compared with the traditional method of cooling the steel coil 300 at a fixed position, this application can not only ensure the uniform heat dissipation of the steel coil 300, but also effectively improve the cooling effect of the steel coil 300, so as to ensure that the heat treatment effect of the steel coil 300 can meet the application requirements.

[0050] It is also understood that in this application, the loading rack 200 can be fixedly installed on the frame 100, and the two sets of air-cooling devices 400 can be moved and installed on the frame 100. Then, the drive mechanism 5 can be connected to the air-cooling device 400. Thus, the above-mentioned effect of this application can also be achieved by driving the air-cooling device 400 to reciprocate along the frame 100 through the drive mechanism 5. However, since the air-cooling device 400 needs to be connected to the circuit, the movement of the air-cooling device 400 is somewhat dangerous; therefore, in this application, it is preferred to drive the loading rack 200 to move through the drive mechanism 5.

[0051] It should be understood that the specific structure and working principle of the air-cooling device 400 are well known to those skilled in the art, and therefore will not be described in detail here.

[0052] In this embodiment, since the translational distance of the loading rack 200 along the frame 100 is the spacing of one loading station 210, the number of air-cooling devices 400 is one more than the number of loading stations 210. That is, if the number of loading stations 210 is N, then the number of air-cooling devices 400 is N+1. For example, 1 to... Figure 3 As shown, there are six loading stations 210, so there are seven air-cooling devices 400; three of the seven air-cooling devices 400 are in one group, and the other four are in another group. The two groups of air-cooling devices 400 are located on both sides of the frame 100.

[0053] One embodiment of this application, such as Figures 1 to 4As shown, each loading station 210 of the loading rack 200 is equipped with a support assembly 6; the support assembly 6 is provided with a support area for placing the steel coils 300 to be cooled. The drive mechanism 5 can cooperate with the support assembly 6, and the driving action of the drive mechanism 5 includes a first action and a second action. When steel coils 300 of different diameters are being cooled, the drive mechanism 5 can drive the support assembly 6 to move the support area vertically through the first action, so that when steel coils 300 of different diameters are placed in the support area, the center of the steel coils 300 can be aligned with the center of the air cooling device 400, ensuring that the steel coils 300 are in the optimal cooling channel position. During this process, the drive mechanism 5 disengages from the frame 100 so that the loading rack 200 can remain stationary in the translational direction. When the steel coil 300 is air-cooled, the drive mechanism 5 can drive the feeding rack 200 and the support assembly 6 to reciprocate along the frame 100 in a second action; during this process, the drive mechanism 5 disengages from the support assembly 6 so that the support assembly 6 can remain stationary in the vertical direction, thus ensuring the stability of the steel coil 300 during the cooling process.

[0054] It is understandable that during the cooling process of the steel coil 300, the cooling of the steel coil 300 is most uniform when its center is aligned with the center of the cooling channel. Since the air-cooling device 400 needs to be connected to electrical circuits, its height is generally fixed. Therefore, with a fixed height for the support assembly 6, placing steel coils 300 of different diameters will result in the center of the steel coil 300 not aligning with the center of the cooling channel, thus affecting the heat treatment effect of the steel coil 300. Therefore, in this embodiment, by adjusting the height of the support assembly 6 to accommodate steel coils 300 of different diameters, the cooling effect on different steel coils 300 can be effectively improved, and the applicability or versatility of the system in this application can also be improved.

[0055] In this embodiment, the specific structure of the support area can be varied; it can be a plate-like support plane or a roller-like support limiter. To avoid the structure of the support area interfering with the cooling of the steel coil 300, a roller-like support limiter is preferred. Figure 4 , Figure 6 and Figure 7 As shown, the support assembly 6 includes a pair of support rollers 61, which are arranged in parallel to form a support area for supporting the steel coil 300.

[0056] It is understandable that there are various ways to adjust the height of the support area, including but not limited to the two described below.

[0057] Method 1: For example Figure 6 and Figure 7As shown, the support assembly 6 includes two pairs of support plates 62 and a fixed roller 63. The fixed roller 63 is fixedly installed at the loading station 210; two support rollers 61 are located on both sides above the fixed roller 63; the two pairs of support plates 62 are located at both ends of the fixed roller 63, with the two support plates 62 of each pair arranged crosswise and hinged to the fixed roller 63 at the middle, and the two support plates 62 of each pair connected to the ends of the two support rollers 61 on the same side at their upper ends; the lower ends of the two support plates 62 of each pair cooperate with the drive mechanism 5 through a traction assembly. When the drive mechanism 5 performs its first action, the support plates 62 can drive the two support rollers 61 to rotate around the fixed roller 63 in opposite directions or in opposite directions, thereby changing the vertical height of the support area.

[0058] Method 2: The support roller 61 is slidably mounted on the feeding frame 200, so that the support roller 61 can slide along the feeding frame 200 under the drive mechanism 5, thereby adjusting the height of the support area. The sliding of the support roller 61 can be vertical or inclined.

[0059] It is understandable that when the height of the support area formed by the two support rollers 61 is adjusted, the distance between the two support rollers 61 can remain constant, that is, the support rollers 61 slide vertically; the distance between the two support rollers 61 can also change with the height. Generally speaking, the higher the height of the support area, the smaller the diameter of the steel coil 300 being cooled, so the distance between the two support rollers 61 needs to be reduced to accommodate this.

[0060] When the steel coil 300 is placed in the support area, let α be the angle between the center of the steel coil 300 and the line connecting the two support rollers 61. The larger the value of the angle α, the higher the stability of the support area for the steel coil 300, and vice versa. Therefore, the value of the angle α should be set as large as possible. However, considering that the subsequent support rollers 61 need to drive the steel coil 300 to rotate, an excessively large angle α will make it difficult for the steel coil 300 to rotate. Generally speaking, the optimal value of the angle α is between 60° and 90°. In order to ensure that the support rollers 61 can also have good rotational smoothness when adjusting the height of the support area for steel coils 300 of different diameters, the support rollers 61 can be tilted or slid in an arc in the vertical direction to adjust the height of the support area and adjust the distance between the two support rollers 61.

[0061] It is understandable that both of the above methods can meet the usage requirements. For the sake of convenience in the following description, we will take method one as an example.

[0062] One embodiment of this application, such as Figure 5As shown, the drive mechanism 5 includes a motor 51, a first transmission assembly, and a second transmission assembly. The output shaft 511 of the motor 51 is fitted with a first transmission component 52 and a second transmission component 53 via one-way bearings. The first transmission component 52 can be connected to the input end of the first transmission assembly, and the output end of the first transmission assembly can cooperate with the traction assembly. The second transmission component 53 can be connected to the input end of the second transmission assembly, and the output end of the second transmission assembly can cooperate with the frame 100. When the motor 51 performs a first forward rotation, the first transmission component 52 can drive the traction assembly to adjust the height of the support area via the first transmission assembly. During this process, the one-way bearing cooperating with the second transmission component 53 is in a free state. When the motor 51 performs a second reverse rotation, the second transmission component 53 can cooperate with the frame 100 via the second transmission assembly, thereby driving the loading rack 200 to reciprocate relative to the frame 100. During this process, the one-way bearing cooperating with the first transmission component 52 is in a free state.

[0063] Understandably, the height adjustment of the support area is typically done only after one batch of steel coils 300 has cooled, and when the next batch of steel coils 300 with different diameters appears. However, the movement of the loading rack 200 occurs throughout the entire cooling process of the steel coils 300. This means the time for adjusting the height of the support area is very short. Therefore, setting separate drive sources for the height adjustment of the support area and the movement of the loading rack 200 would be wasteful of resources. A better approach is to use a single drive source with different actions to achieve both the height adjustment of the support area and the movement of the loading rack 200 separately.

[0064] In this embodiment, as Figure 7 and Figure 9 As shown, the first transmission assembly includes a transmission shaft 220 and multiple worm gears 64. The transmission shaft 220 is rotatably mounted on the lower part of the loading rack 200 along its length. Worm sections 221 are correspondingly provided at each loading station 210 of the transmission shaft 220. The number of worm gears 64 corresponds to the number of loading stations 210, and each worm gear 64 is rotatably mounted on the loading rack 200 via a first rotating shaft 641 and located below the corresponding fixed roller 63, so that the transmission shaft 220 can engage with the worm gears 64 through the worm sections 221. The first rotating shaft 641 can engage with the traction assembly, and the first transmission component 52 can engage with the transmission shaft 220. Thus, when the motor 51 rotates in the forward direction, the first transmission component 52 can drive the transmission shaft 220 to rotate, causing the transmission shaft 220 to drive the worm gears 64, along with the first rotating shaft 641, to rotate via the worm sections 221, thereby driving the traction assembly to adjust the height of the support area.

[0065] It is understood that the first transmission component 52 can be a spur gear or a bevel gear depending on the installation position of the motor 51, so that the first transmission component 52 and the transmission shaft 220 can be meshed through a gear set or a bevel gear set. The specific meshing structure is well known to those skilled in the art, and therefore will not be described in detail here.

[0066] It is also understandable that the cooperation between the worm segment 221 and the worm wheel 64 can achieve locking of the support area at any height; that is, the worm wheel and worm structure has self-locking properties. When the support roller 61 is at any desired height position to move the steel coil 300, the meshing of the worm wheel 64 and the worm segment 221 can lock the vertical movement of the support roller 61, ensuring the stability of the loading frame 200 in driving the steel coil 300 to reciprocate and translate.

[0067] Specifically, in order to support the compactness of the overall structure of component 6, such as Figure 7 and Figure 9 As shown, both ends of the fixed roller 63 are fixed with mounting brackets 65, which extend downward so that the worm gear 64 can be rotatably mounted on the mounting bracket 65 via the first rotating shaft 641.

[0068] In this embodiment, as Figures 7 to 9 As shown, the traction assembly includes a traction plate 66 and a drive component. The traction plate 66 is vertically slidably mounted on the frame 100. Both sides of the traction plate 66 are respectively connected to the lower ends of the corresponding support plates 62. The drive component is mounted on the first rotating shaft 641, and the drive component and the traction plate 66 are connected through a traction structure. During the process of the first transmission assembly driving the first rotating shaft 641 to rotate, the drive component can rotate with the first rotating shaft 641, thereby driving the traction plate 66 to drive the lower end of the support plate 62 to rotate in opposite directions around the fixed roller 63 through the traction structure, so that the support roller 61 mounted on the upper end of the support plate 62 also rotates in opposite directions, thereby realizing the adjustment of the height of the support area.

[0069] It is understandable that there are various specific structures for traction structures, including but not limited to the two described below.

[0070] Specific Structure 1: As shown in the example Figure 7 and Figure 8As shown, the driving component is a missing gear 642. A clearance groove 660 is vertically arranged in the middle of the traction plate 66, and a first rack segment 661 and a second rack segment 662 are respectively arranged on both sides of the clearance groove 660. The missing gear 642 forms a traction structure by cooperating with the first rack segment 661 and the second rack segment 662. When the first rotating shaft 641 rotates one revolution under the drive of the first transmission component, the missing gear 642 can mesh with the first rack segment 661 through its toothed segment, causing the traction plate 66 to slide in a vertical first direction under the drive of the missing gear 642; during this process, the missing gear 642 corresponds to the second rack segment 662 through its toothless segment. Subsequently, the missing gear 642 meshes with the second rack segment 662 through its toothed segment, causing the traction plate 66 to slide in a vertical second direction under the drive of the missing gear 642; during this process, the missing gear 642 corresponds to the first rack segment 661 through its toothless segment. By reciprocating the traction plate 66 in the vertical direction, the support plate 62 can be driven to rotate the support roller 61 around the fixed roller 63.

[0071] Understandably, when the end of the toothed segment of the missing gear 642 is about to disengage from the first rack segment 661, the beginning of the toothed segment of the missing gear 642 is about to engage with the second rack segment 662. Similarly, when the end of the toothed segment of the missing gear 642 is about to disengage from the second rack segment 662, the beginning of the toothed segment of the missing gear 642 is about to engage with the first rack segment 661.

[0072] Specific Structure Two: As shown in Figure 9 As shown, the driving component is a crank 643, and a horizontal second traction groove 663 is provided in the middle of the traction plate 66. The crank 643 can slide with the second traction groove 663 through a pin at its end. When the first shaft 641 rotates one revolution under the drive of the first transmission assembly, the crank 643 can drive the pin to slide along the second traction groove 663 by rotating with the first shaft 641, thereby driving the traction plate 66 to reciprocate once in the vertical direction. Through the reciprocating sliding of the traction plate 66 in the vertical direction, the support plate 62 can be driven to drive the support roller 61 to rotate around the fixed roller 63.

[0073] Understandably, when the height of the support area needs to be increased, if the rotation of the first rotating shaft 641 can drive the traction plate 66 to move vertically downward, then when the height of the support area needs to be reduced, the rotation of the first rotating shaft 641 must move the traction plate 66 vertically downward to the limit position, that is, after the height of the support area has increased to the maximum, before the traction plate 66 can be moved vertically upward to the set position to meet the requirement of reducing the height of the support area.

[0074] In this embodiment, the traction plate 66 can be connected to the lower end of the corresponding support plate 62 through both sides in various ways, including but not limited to the two described below.

[0075] Connection method 1: such as Figure 7 As shown, the two sides of the traction plate 66 are hinged to the lower ends of the corresponding support plate 62 via hinge plates 67. Thus, during the vertical movement of the traction plate 66, the support plate 62 can be pulled around the fixed roller 63 by the traction of the hinge plates 67.

[0076] Connection method two: such as Figure 9 As shown, each of the support plates 62 has a first traction groove 620 at its lower end. The traction plate 66 slides with the first traction groove 620 at the lower end of the support plate 62 on the corresponding side via pins on both sides. Thus, during the vertical movement of the traction plate 66, the support plate 62 can be driven to rotate around the fixed roller 63 by sliding the pins along the first traction groove 620.

[0077] In this embodiment, as Figure 5 , Figure 10 and Figure 11 As shown, a pair of rack plates, namely a first rack plate 130 and a second rack plate 140, are fixed parallel to each other on the frame 100; the second transmission component 53 is an incomplete gear or a missing gear. The second transmission component includes a pair of gear sets 54; the gear sets 54 are symmetrically mounted on the loading rack 200 around the output shaft 511. One gear set 54 can mesh with the first rack plate 130 through its output end, and the other gear set 54 can mesh with the second rack plate 140 through its output end; the input ends of both gear sets 54 can cooperate with the second transmission component 53. When the motor 51 rotates in the opposite direction, the second transmission component 53 can mesh with the input ends of the two gear sets 54 successively through its toothed segments, so that the gear sets 54 drive the loading rack 200 to reciprocate along the frame 100 by sequentially meshing with the rack plates on the corresponding sides.

[0078] Understandably, after the second transmission component 53 engages with the input end of one of the gear sets 54 through the toothed segment, the motor 51 can be shut down for a period of time and then restarted; so that during the shutdown of the motor 51, the steel coil 300 located at the loading station 210 can be cooled for a set time by the air cooling device 400 corresponding to the current position.

[0079] It is also understandable that, due to the long interval between the loading stations 210, if the toothed section of the second transmission member 53 directly meshes with the first rack plate 130 or the second rack plate 140, the meshing stroke would be difficult to meet the horizontal movement stroke of the loading rack 200. Therefore, the meshing stroke of the second transmission member 53 can be amplified by setting a gear set 54. The specific structure of the gear set 54 is known to those skilled in the art; the gear set 54 includes at least one first gear 541 and one second gear 542; the diameter of the first gear 541 is smaller than the diameter of the second gear 542, and the first gear 541 and the second gear 542 are coaxially mounted. The first gear 541 can cooperate with the second transmission member 53, and the second gear 542 can mesh with the first rack plate 130 or the second rack plate 140. Thus, the meshing stroke of the second transmission member 53 is amplified by the mutual cooperation of the first gear 541 and the second gear 542.

[0080] In this embodiment, the motor 51 can be vertically fixedly installed at one end of the feeding rack 200; then the two rack plates can be set on the upper end face of the frame 100. The motor 51 can also be horizontally fixedly installed on one side of the feeding rack 200; then the two rack plates can be set on one side of the frame 100.

[0081] In this embodiment, as Figure 14 As shown, multiple rollers 800 are installed at the lower end of the loading rack 200; the loading rack 200 can reciprocate along the frame 100 by means of the rollers 800, which can effectively reduce the resistance of the loading rack 200 during movement.

[0082] One embodiment of this application, such as Figure 4 , Figure 12 and Figure 13 As shown, the support roller 61 is rotatably connected to the upper end of the support plate 62. At least one end of at least one support roller 61 in the support assembly 6 is engaged with the frame 100 via a rotating assembly 7, so that during one reciprocating movement of the loading rack 200 along the frame 100, the support roller 61 can rotate unidirectionally around the upper end of the support plate 62 under the drive of the rotating assembly 7, thereby driving the steel coil 300 placed in the support area to rotate at a set angle, so as to further improve the cooling effect on the steel coil 300.

[0083] Understandably, since the steel coil 300 is placed on the support assembly 6, the lower part of the steel coil 300 will interfere with the cooling channel of the air-cooling device 400 due to the influence of the support assembly 6. Simultaneously, the different heat dissipation spaces at the top and bottom of the steel coil 300 will also lead to different cooling efficiencies at different locations. Therefore, during the reciprocating translational movement of the steel coil 300 with the loading rack 200, rotating the steel coil 300 at a unidirectional set angle can ensure uniform cooling of the steel coil 300, thereby further improving its cooling efficiency and heat treatment performance.

[0084] It is also understandable that since there are two support rollers 61, one of the support rollers 61 can drive the steel coil 300 to rotate by rotating around its own axis when the friction is sufficient; however, in order to improve the stability of the rotation of the steel coil 300, it is preferable that both ends of the two support rollers 61 of the support assembly 6 are connected to the frame 100 through the rotating assembly 7.

[0085] In this embodiment, as Figure 12 and Figure 13 As shown, at least one side of the frame 100 is provided with a plurality of third rack plates 150 corresponding to the loading station 210, and the loading rack 200 has a second rotating shaft 73 rotatably mounted below the fixed roller 63. The rotating assembly 7 includes a first connecting plate 71, a second connecting plate 72, and a third gear 74; the third gear 74 is rotatably mounted on the second rotating shaft 73 via a one-way bearing; the first connecting plate 71 and the second connecting plate 72 are hinged to each other at one end, the other end of the first connecting plate 71 is hinged to the support roller 61, and the other end of the second connecting plate 72 is hinged to the second rotating shaft 73. The first connecting plate 71 is parallel and its length is equal to the line connecting the fixed roller 63 and the second rotating shaft 73, and the second connecting plate 72 is parallel and its length is equal to the line connecting the fixed roller 63 and the support roller 61. The support roller 61, the hinged positions of the first connecting plate 71 and the second connecting plate 72, and the second rotating shaft 73 are connected by belt drive or chain drive. Thus, when the support assembly 6 adjusts the height of the support area, the lines connecting the first connecting plate 71, the second connecting plate 72, the fixed roller 63, and the second rotating shaft 73, as well as the line connecting the fixed roller 63 and the support roller 61, form a parallelogram structure to maintain the tension of the belt drive or chain drive. During the movement of the loading rack 200, the third gear 74 can mesh unidirectionally with the third rack plate 150, thereby driving the support roller 61 to rotate a set number of revolutions via belt drive or chain drive.

[0086] Understandably, taking the increase in the height of the support area as an example, such as... Figure 12 and Figure 13The two support rollers 61 can rotate towards each other around the fixed roller 63 via the support plate 62. During this process, the support plate 62 can be pulled by the first connecting plate 71 to rotate in the same way as the second connecting plate 72. This results in a parallelogram structure with a different shape but a constant perimeter between the lines connecting the first connecting plate 71, the second connecting plate 72, the fixed roller 63, and the second rotating shaft 73, as well as between the fixed roller 63 and the support roller 61. Furthermore, the belt drive or chain drive between the support roller 61, the hinge position of the first connecting plate 71 and the second connecting plate 72, and the second rotating shaft 73 can remain taut to ensure that the height adjustment of the support area does not interfere with the rotation of the support roller 61.

[0087] One embodiment of this application, such as Figure 2 , Figure 3 and Figure 15 As shown, the frame 100 is provided with a loading area 110 and a clearance area 120 along its extension direction; the air-cooling device 400 is slidably mounted on the frame 100. The loading rack 200 is installed in the loading area 110 and reciprocates within the loading area 110. When loading or unloading the steel coil 300, the air-cooling device 400 can slide from the loading area 110 to the clearance area 120 until multiple air-cooling devices 400 in each group are close to each other within the clearance area 120. When air-cooling the steel coil 300 is required after loading, the air-cooling devices 400 located in the clearance area 120 can be moved back to a set position to cool the steel coil 300.

[0088] Understandably, since the air-cooling device 400 is located on one side of the loading station 210, when loading or unloading the steel coil 300, a crane is needed to lift the steel coil 300 to the top of the frame 100 for lowering or unloading, or to lift the cooled steel coil 300 from the top of the frame 100 and remove it. In these processes, the lifting height of the steel coil 300 is relatively high, making manual intervention inconvenient and increasing the risk of safety accidents. However, by moving the air-cooling device 400 in this application, the lifting height of the steel coil 300 can be effectively reduced, facilitating safe loading and unloading of the steel coil 300.

[0089] Another aspect of this application provides a stainless steel surface treatment process, a preferred embodiment of which includes the following process steps:

[0090] S1: Raw material rolling, rolling steel billets to a set thickness and forming steel coils 300.

[0091] S2: Alkali washing treatment, the steel coil 300 with the set thickness obtained in step S1 is put into an alkaline washing machine for cleaning.

[0092] S3: Drying treatment. The steel coil 300 after alkaline washing in step S2 is placed into a dryer for drying.

[0093] S4: Annealing treatment. The steel coil 300 dried in step S3 is placed in a horizontal annealing furnace for annealing at a set temperature and time.

[0094] S5: Cooling treatment. The steel coil 300 that has been annealed in step S4 is placed on the loading station 210 of the above-mentioned ferritic stainless steel heat treatment system for cooling.

[0095] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A heat treatment system for ferritic stainless steel, characterized in that, include: frame; A loading rack; the loading rack is slidably installed on the machine frame, and the loading rack is provided with multiple loading stations for placing steel coils to be cooled; Two sets of air-cooling devices; the two sets of air-cooling devices are respectively arranged on both sides of the frame; there is a loading station between each pair of adjacent air-cooling devices in each set, and the two sets of air-cooling devices are staggered along the arrangement direction, so that in the adjacent loading stations, one loading station is aligned with the air-cooling device of the first set through the first side, and the other loading station is aligned with the air-cooling device of the second set through the second side; as well as Drive mechanism; the drive mechanism is installed on the loading rack, and the drive mechanism is adapted to drive the loading rack to reciprocate along the frame, thereby driving the steel coil on the loading station to be cooled by the two sets of air cooling devices on the first side and the second side respectively; Each of the feeding stations is equipped with a support assembly, which has a support area for placing the steel coil to be cooled. The drive mechanism cooperates with the support assembly. When steel coils of different diameters are cooled, the drive mechanism is adapted to drive the support assembly to move the support area vertically through a first action, so that when steel coils of different diameters are placed in the support area, the center of the steel coils is aligned with the center of the air-cooling device, and the loading rack remains stationary during this process. During the air cooling process, the drive mechanism is adapted to drive the feeding rack and the support assembly to reciprocate synchronously through a second action, during which the support assembly remains stationary in the vertical direction.

2. The heat treatment system for ferritic stainless steel as described in claim 1, characterized in that, The support components include: Fixed roller; the fixed roller is fixedly installed at the feeding station; A pair of support rollers; the two support rollers are located on either side above the fixed roller to form the support area; and Two pairs of support plates; the two pairs of support plates are respectively located at both ends of the fixed roller, the two support plates of each pair are cross-arranged and hinged to the fixed roller through the middle, and the two support plates of each pair are respectively connected to the ends of the two support rollers on the same side through the upper end; the lower end of the two support plates of each pair cooperates with the drive mechanism through the traction assembly; When the drive mechanism performs its first action, the support plate drives the two support rollers to rotate toward or away from the fixed roller, thereby changing the vertical height of the support area.

3. The heat treatment system for ferritic stainless steel as described in claim 2, characterized in that, The drive mechanism includes: An electric motor; the output shaft of the electric motor is respectively equipped with a first transmission component and a second transmission component via a one-way bearing; A first transmission assembly; the first transmission member is adapted to connect to the input end of the first transmission assembly, and the output end of the first transmission assembly cooperates with the traction assembly; and The second transmission component is adapted to be connected to the input end of the second transmission component, and the output end of the second transmission component is adapted to cooperate with the frame. When the motor performs the first action of forward rotation, the first transmission component is adapted to drive the traction component to adjust the height of the support area through the first transmission component. During this process, the one-way bearing that cooperates with the second transmission component is in a free state. When the motor performs the second reverse rotation action, the second transmission component is adapted to cooperate with the frame through the second transmission assembly, thereby driving the loading rack to reciprocate relative to the frame. During this process, the one-way bearing that cooperates with the first transmission component is in a free state.

4. The heat treatment system for ferritic stainless steel as described in claim 3, characterized in that: The first transmission assembly includes a transmission shaft and a plurality of worm gears; the transmission shaft is rotatably mounted on the lower part of the loading rack along the length direction of the loading rack; the worm gears are rotatably mounted on the loading rack via a first rotating shaft and located below the fixed roller; the transmission shaft is adapted to cooperate with the worm gears via a provided worm section; the first rotating shaft cooperates with the traction assembly; When the motor rotates in the forward direction, the first transmission component is adapted to drive the transmission shaft to rotate, so that the transmission shaft drives the worm wheel and the first rotating shaft to rotate through the worm section, thereby driving the traction component to adjust the height of the support area.

5. The heat treatment system for ferritic stainless steel as described in claim 4, characterized in that: The traction assembly includes a traction plate and a drive component; the traction plate is vertically slidably mounted on the frame, and both sides of the traction plate are respectively connected to the lower ends of the corresponding support plates. The drive component is mounted on the first rotating shaft, and the drive component and the traction plate are connected through a traction structure. Thus, during the rotation of the first rotating shaft, the drive component is adapted to drive the traction plate to rotate the lower ends of the support plates around the fixed roller in opposite directions or in opposite directions through the traction structure.

6. The heat treatment system for ferritic stainless steel as described in claim 3, characterized in that: A pair of rack plates are fixed in parallel on the frame; the second transmission component is an incomplete gear; the second transmission assembly includes a pair of gear sets; the gear sets are symmetrically mounted on the loading rack around the output shaft, and the two gear sets mesh with the rack plates on the corresponding sides through their output ends; When the motor rotates in the reverse direction, the second transmission member is adapted to mesh with the input ends of the two gear sets successively through the toothed segment, so that the gear sets drive the loading rack to reciprocate along the frame by meshing with the rack plates on the corresponding sides in sequence.

7. The heat treatment system for ferritic stainless steel according to any one of claims 2-6, characterized in that: The support roller is rotatably connected to the upper end of the support plate; at least one end of at least one support roller in the support assembly is engaged with the frame through a rotating assembly, so that during the reciprocating movement of the feeding rack along the frame, the support roller rotates unidirectionally around the upper end of the support plate under the drive of the rotating assembly, thereby driving the steel coil placed in the support area to rotate at a set angle.

8. A stainless steel surface treatment process, characterized in that, The process includes the following steps: S1: Raw material rolling, which rolls steel billets to a set thickness and forms steel coils; S2: Alkaline washing treatment, the steel coil of the set thickness obtained in step S1 is put into an alkaline washing machine for cleaning. S3: Drying treatment, the steel coils after alkaline washing in step S2 are placed into a dryer for drying; S4: Annealing treatment, the steel coil dried in step S3 is placed in a horizontal annealing furnace for annealing at a set temperature and time. S5: Cooling treatment, the steel coil annealed in step S4 is placed in the heat treatment system for ferritic stainless steel as described in any one of claims 1-7 for cooling.

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