Rack batch heat treatment tempering furnace

Abstract

The application discloses a rack batch heat treatment tempering furnace, which comprises a base, a furnace body arranged on the upper end face of the base, an equalizing mechanism arranged in the furnace body and on the base and used for keeping the temperature balance of each area of the furnace body, a support frame horizontally arranged in the interior of the furnace body, and a sliding positioning assembly symmetrically arranged in the interior of the support frame and used for positioning the rack; the rack batch heat treatment tempering furnace has the advantages that the continuous symmetrical sliding of the supporting roller in the heat treatment process provides dynamic support for the lower end face of the corresponding rack, avoids the uneven tempering hardness and local stress concentration of the rack due to single clamping or supporting position, improves the overall performance and service life of the rack, is more in line with the actual use requirements in the current high-end equipment manufacturing field, eliminates the temperature difference, guarantees the performance balance of the rack after tempering in each area of the furnace body, and further improves the tempering quality of the rack.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat treatment equipment, in particular to a tempering furnace for batch heat treatment of racks. BACKGROUND

[0002] With the rapid development of high-end equipment manufacturing industry, as the core component of precision transmission system, the mechanical properties and dimensional stability of rack directly affect the running accuracy and service life of equipment. Tempering is one of the key processes of rack heat treatment, which can effectively eliminate quenching stress, stabilize the structure, and improve the toughness and fatigue resistance of the material. Especially in the fields of aerospace, high-precision numerical control machine tools, etc., the rack after tempering needs to have very high hardness uniformity and dimensional stability to meet the long-term reliable operation requirements under extreme working conditions. Therefore, optimizing the rack tempering process and equipment is of great significance to improve the performance of high-end transmission components.

[0003] The traditional device has the following disadvantages:

[0004] At present, the tempering furnace for rack heat treatment mostly adopts box type or continuous type structure, which increases the temperature in the furnace by resistance heating or gas heating and then naturally cools down to realize the tempering treatment of the rack. In batch production, in order to avoid uneven heating caused by stacking of racks, special clamps or supports are usually used to arrange the racks at certain intervals to ensure the circulation of hot air. However, the existing technology still has obvious defects: due to the difference in heat conduction efficiency of the contact parts between the rack and the clamp or support, the heating conditions of this area and other parts are inconsistent, which easily leads to uneven tempering hardness, and even local stress concentration. This problem is particularly prominent in batch processing, not only reduces the overall performance consistency of the rack, but also may affect its service life in precision transmission system due to local softening or embrittlement. SUMMARY

[0005] The purpose of the present application is to provide a tempering furnace for batch heat treatment of racks to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a tempering furnace for batch heat treatment of racks, comprising a base, a furnace body is arranged on the upper end face of the base, a uniform temperature mechanism is arranged in the furnace body and on the base for keeping the temperature balance of each area of the furnace body, a support frame is transversely arranged in the interior of the furnace body, and a sliding positioning assembly for positioning the rack is symmetrically arranged in the interior of the support frame.

[0007] The sliding positioning assembly comprises:

[0008] A linkage assembly is arranged on the support frame and the temperature equalizing mechanism, the support frame is provided with four positioning vertical bars on each side, and the positioning vertical bars are symmetrical to each other in the transverse and longitudinal directions, the positioning vertical bars are driven by the linkage assembly to move horizontally in the support frame, and the two ends of the positioning vertical bars are provided with sliding blocks, and the positioning vertical bars are slidably connected to the sliding grooves on the inner wall of the support frame through the sliding blocks.

[0009] A support roller is transversely connected between the two positioning vertical bars through a roller shaft, and the support roller is used for supporting the rack and can roll relative to the rack.

[0010] Limiting strips are symmetrically arranged in the notches on the two sides of the support frame, and the limiting strips are located on the two sides of each layer of the support roller and are used for horizontally limiting the rack.

[0011] Preferably, the temperature equalizing mechanism comprises:

[0012] A rotating inner ring is arranged in the center of the inside of the furnace body, rotating outer rings are symmetrically arranged on the two sides of the inside of the furnace body, the rotating inner ring and the rotating outer rings are rotatably connected to the inner wall of the furnace body, and a plurality of air plates are connected between the two sides of the rotating inner ring and the rotating outer rings.

[0013] An outer tooth ring is arranged in the groove on the outer wall of the rotating inner ring and the rotating outer rings, and a through groove is arranged on the furnace wall of the furnace body and located at the lower end of the outer tooth ring.

[0014] A driving part is arranged on the upper end face of the base, an output end of the driving part is connected with a transmission shaft, the transmission shaft is horizontally arranged below the furnace body, a plurality of driving gears are arranged on the transmission shaft, and the driving gears are engaged with the outer tooth ring through the through groove.

[0015] Preferably, the linkage assembly comprises:

[0016] An inner tooth ring is arranged on the inner wall of the rotating inner ring and the rotating outer rings.

[0017] A driven gear is arranged in the embedding groove on the two sides and the middle of the support frame, and the wheel shaft of the driven gear is rotatably connected to the mounting hole on the support frame.

[0018] An inner tooth frame is arranged at the two ends of the positioning vertical bar, teeth are arranged on the upper and lower inner walls of the inner tooth frame, a driving disc is arranged in the inner tooth frame, the outer edge of the driving disc is partially provided with teeth matched with the inner tooth frame, the driving disc is connected with the wheel shaft of the driven gear, and the driving disc drives the inner tooth frame to reciprocatingly move horizontally.

[0019] Preferably, the lower end surface of the limiting strip is flush with the upper end of the supporting roller.

[0020] Preferably, the two sides of the driving gear are provided with sealing rings, and the lower profile of the through groove matches the profile of the sealing ring.

[0021] Preferably, ball grooves are arranged on the outer walls of the rotating inner ring and the rotating outer ring, and the ball grooves are provided with rolling balls in rolling connection with the inner wall of the furnace body.

[0022] Preferably, sliding doors are arranged on the two sides of the furnace body.

[0023] Preferably, the supporting roller is made of ceramic material.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1. The sliding positioning assembly is arranged, the symmetric sliding of the supporting roller during heat treatment is utilized, the dynamic support is provided for the lower end surface of the corresponding rack, the single clamping or supporting position of the rack is avoided, the conditions such as uneven tempering hardness and local stress concentration are avoided, the overall performance and service life of the rack are improved, and the actual use requirements in the current high-end equipment manufacturing field are more met.

[0026] 2. The temperature equalizing mechanism is arranged, the hot air flow in each area of the furnace body is actively mixed by the rotation of the air plate during tempering, the temperature difference is eliminated, the performance balance of the rack in each area of the furnace body after tempering is ensured, the tempering quality of the rack is further improved, the driving part is arranged on the outside of the furnace body 2, and damage caused by high temperature in the furnace is avoided.

[0027] 3. The linkage assembly is arranged, the local teeth of the driving disc are arranged, the upper and lower teeth of the inner tooth frame are matched, the positioning vertical strip is reciprocatingly moved when the driving disc rotates, the rotating inner ring, the rotating outer ring, the driven gear and the driving disc are synchronously rotated under the meshing transmission of the inner tooth ring and the driven gear, the power output is uniformly provided by the driving part, the redundant driving structure is reduced, the transmission efficiency is high, and maintenance is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a whole three-dimensional schematic view of the present application;

[0029] Figure 2 It is a schematic view of the internal structure of the furnace body of the present application;

[0030] Figure 3 It is a whole three-dimensional schematic view of the temperature equalizing mechanism, the sliding positioning assembly and the linkage assembly of the present application;

[0031] Figure 4Figure 1 is a schematic diagram of the connection of the rotating inner ring, the rotating outer ring and the air plate of the present application;

[0032] Figure 5 Figure 2 is a schematic diagram of the support frame of the present application;

[0033] Figure 6 Figure 3 is a schematic diagram of the transmission of the driven gear and the positioning vertical bar of the present application;

[0034] Figure 7 Figure 4 is a schematic diagram of the side view of the overall internal structure of the present application;

[0035] Figure 8 Figure 5 is a schematic diagram of the Figure 7 Figure 6 is a schematic diagram of the enlarged view at A in Figure 5;

[0036] Figure 9 Figure 7 is a schematic diagram of the front view of the overall internal structure of the present application;

[0037] Figure 10 Figure 8 is a schematic diagram of the Figure 9 Figure 9 is a schematic diagram of the enlarged view at B in Figure 8;

[0038] Figure 11 Figure 10 is a schematic diagram of the Figure 9 Figure 11 is a schematic diagram of the enlarged view at C in Figure 10;

[0039] Figure 12 Figure 12 is a schematic diagram of the positioning of the rack during the tempering process of the present application;

[0040] Figure 13 Figure 13 is a schematic diagram of the reciprocating movement principle of the positioning vertical bar of the present application.

[0041] In the figure: 1, base; 2, furnace body; 3, temperature equalizing mechanism; 301, rotating inner ring; 302, rotating outer ring; 303, air plate; 304, outer tooth ring; 305, through slot; 306, driving part; 307, transmission shaft; 308, driving gear; 3081, sealing ring; 309, ball; 4, support frame; 5, sliding positioning assembly; 501, positioning vertical bar; 502, sliding block; 503, support roller; 504, limiting strip; 6, linkage assembly; 601, inner tooth ring; 602, driven gear; 603, inner tooth frame; 604, driving disc; 7, sliding door. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear and explicit, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0043] It should be noted that when an element is referred to as being "fixed", "mounted", "connected" or "set" with another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0044] As a further improvement of the present application, the terms "first", "second", "third" and the like are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implying a specific number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0045] Please refer to Figures 1-13 As shown in the drawings, the present application provides a rack batch heat treatment with tempering furnace technical scheme: a rack batch heat treatment with tempering furnace, including base 1, the upper end surface of base 1 is fixedly installed with furnace body 2, the furnace body 2 and the base 1 are installed with temperature equalizing mechanism 3 for keeping the balance of the temperature of each area of furnace body 2, the inside of furnace body 2 is fixedly installed with support frame 4 transversely, the inside of support frame 4 is symmetrically installed with sliding positioning assembly 5 for positioning rack, support frame 4 will not rotate with the operation of temperature equalizing mechanism 3 and sliding positioning assembly 5;

[0046] The sliding positioning assembly 5 comprises a linkage assembly 6, a supporting roller 503 and a limiting strip 504. The linkage assembly 6 is installed on the supporting frame 4 and the temperature equalizing mechanism 3, the supporting frame 4 movably has four positioning vertical strips 501 on each side, and the positioning vertical strips 501 are symmetrical to each other in the transverse and longitudinal directions, the linkage assembly 6 is used for transmitting power of the temperature equalizing mechanism 3 to the positioning vertical strips 501 to drive the positioning vertical strips 501 to move horizontally and reciprocally in the supporting frame 4, and the moving paths of the positioning vertical strips 501 on the two sides of the supporting frame 4 are always symmetrical to the supporting frame 4. The upper and lower ends of the positioning vertical strips 501 are both provided with sliding blocks 502, and the positioning vertical strips 501 are slidably connected to the sliding grooves on the inner walls of the supporting frame 4 through the sliding blocks 502. The supporting roller 503 is transversely connected between the two positioning vertical strips 501 through a roller shaft, the supporting roller 503 is used for supporting the rack and can roll relative to the rack, and the linkage assembly 6 drives the supporting roller 503 to move horizontally and reciprocally in the supporting frame 4 by driving the positioning vertical strips 501. The limiting strip 504 is symmetrically connected in the notches on the two sides of the supporting frame 4, and the limiting strip 504 is located on the two sides of each layer of the supporting roller 503 and is used for horizontally limiting the rack to prevent the rack from deviating to one side due to friction difference and other reasons in the moving process of the supporting roller 503. The supporting roller 503 only has obvious friction difference after aging, and even if the friction difference causes the rack to deviate to one side, the rack also deviates reciprocally in the reciprocating movement of the supporting roller 503, and the situation that one side of the rack always adheres to the limiting strip 504 to cause uneven surface tempering does not occur.

[0047] In actual use of the tempering furnace, the rack to be processed is first placed on the sliding positioning assembly 5, specifically above the supporting roller 503, because the limiting strip 504 limits and the positioning vertical strips 501 are symmetrical to each other in the transverse and longitudinal directions of the supporting frame 4, so the supporting roller 503 is also symmetrically supported on the two sides below the corresponding rack. In the heat treatment process, the temperature equalizing mechanism 3 keeps the opening state to balance the temperature of each area in the furnace body 2, the linkage assembly 6 synchronously drives the positioning vertical strips 501 to move horizontally and reciprocally, the positioning vertical strips 501 in turn drive the supporting roller 503 to move horizontally and reciprocally below the rack, that is, in the heat treatment process of the tempering furnace, the two supporting rollers 503 are taken as a group to support the rack, and the supporting of each group of supporting rollers 503 to the rack above is dynamic, which keeps horizontal and symmetrical movement, thereby realizing balanced heating of each surface of the rack.

[0048] Through the sliding positioning assembly 5, the continuous symmetrical sliding of the supporting roller 503 in the heat treatment process provides dynamic support for the lower end surface of the corresponding rack, avoids the situations of uneven tempering hardness and local stress concentration of the rack due to single clamping or supporting position, improves the overall performance and service life of the rack, and is more in line with the actual use requirements in the current high-end equipment manufacturing field.

[0049] The temperature equalizing mechanism 3 comprises a rotating inner ring 301, an outer tooth ring 304 and a driving part 306. The rotating inner ring 301 is centrally installed in the interior of the furnace body 2, and two rotating outer rings 302 are symmetrically installed on both sides of the interior of the furnace body 2. The rotating inner ring 301 and the rotating outer rings 302 are rotationally connected with the inner wall of the furnace body 2. A plurality of air plates 303 are connected between the two sides of the rotating inner ring 301 and the rotating outer rings 302. The rotating inner ring 301, the rotating outer rings 302 and the air plates 303 are connected to form an integral whole. The outer tooth ring 304 is arranged in the groove on the outer wall of the rotating inner ring 301 and the rotating outer rings 302, and the outer tooth ring 304 is located at the middle of the outer wall of the rotating inner ring 301 and one side of the rotating outer rings 302. A through groove 305 is arranged on the furnace wall of the furnace body 2 below the lower end of the outer tooth ring 304. The driving part 306 is arranged on the upper end surface of the base 1. The output end of the driving part 306 is connected with a transmission shaft 307. The transmission shaft 307 is horizontally arranged below the furnace body 2. A plurality of driving gears 308 are arranged on the transmission shaft 307. The driving gears 308 are engaged with the outer tooth ring 304 through the through groove 305. In order to ensure the heat preservation performance of the furnace body 2, the side wall of the driving gear 308 should be as close as possible to the inner wall of the through groove 305. Meanwhile, a sealing ring 3081 is arranged on the side wall of the driving gear 308. The lower profile of the through groove 305 is connected with the outer wall of the sealing ring 3081 through an arc-shaped groove, so as to further ensure the heat preservation performance of the furnace body 2.

[0050] When the tempering furnace is tempered, the temperature will change and the temperature of the upper part of the furnace body 2 will be higher than that of the lower part. All the driving gears 308 are continuously driven to rotate by the driving part 306 through the transmission shaft 307. The driving gears 308 further drive the rotating inner ring 301 and the rotating outer rings 302 to synchronously rotate through the meshing with the outer tooth ring 304. Since the rotating inner ring 301, the rotating outer rings 302 and the air plates 303 are an integral whole as shown in the figure, the air plates 303 always rotate along the inner wall of the furnace body 2 under the continuous driving of the driving part 306. With the rotation of the air plates 303, the gas in the upper part and the lower part of the furnace body 2 is fully mixed, and the temperature difference is eliminated. Figure 4

[0051] Through the temperature equalizing mechanism 3, the hot gas flow in each region of the furnace body 2 is continuously actively mixed by the rotation of the air plates 303 during the tempering process, the temperature difference is eliminated, the performance of each region of the furnace body 2 after the tempering of the rack is balanced, and the tempering quality of the rack is further improved. Meanwhile, the driving part 306 is arranged on the outer side of the furnace body 2 and will not be damaged by the high temperature in the furnace.

[0052] ​The linkage assembly 6 comprises an inner tooth ring 601, a driven gear 602 and an inner tooth frame 603. The inner tooth ring 601 is arranged on the inner wall of the rotating inner ring 301 and the rotating outer ring 302. The driven gear 602 is movably arranged in the embedding groove on both sides and the middle of the support frame 4, and the wheel shaft of the driven gear 602 is rotationally connected with the mounting hole on the support frame 4. The wheel shaft of the driven gear 602 located in the middle of the support frame 4 is located on both sides of the wheel body and is symmetrical to each other. The inner tooth frame 603 is arranged at both ends of the positioning vertical bar 501, and the upper and lower inner walls of the inner tooth frame 603 are provided with teeth. The inner tooth frame 603 movably accommodates a driving disc 604, and one third of the outer edge of the driving disc 604 is provided with teeth matched with the inner tooth frame 603. The driving disc 604 is connected with the wheel shaft of the driven gear 602 and is driven by the driven gear 602. The driving disc 604 drives the inner tooth frame 603 to move horizontally reciprocatingly.

[0053] When the rotating inner ring 301 and the rotating outer ring 302 rotate, the inner tooth ring 601 on the inner wall thereof drives the driven gear 602 to rotate continuously in a specified direction. The driving disc 604 at the end of the driven gear 602 also rotates continuously in the specified direction. When the teeth of the driving disc 604 engage with the teeth above the inner tooth frame 603, the inner tooth frame 603 is driven to move the positioning vertical bar 501 in one direction. When the teeth of the driving disc 604 engage with the teeth below the inner tooth frame 603, the inner tooth frame 603 is driven to move the positioning vertical bar 501 in the opposite direction, thereby achieving the reciprocating movement effect.

[0054] Through the linkage assembly 6, by arranging the partial teeth of the driving disc 604 and matching the upper and lower teeth of the inner tooth frame 603, the positioning vertical bar 501 is driven to move reciprocatingly when the driving disc 604 rotates. Meanwhile, under the meshing transmission effect of the inner tooth ring 601 and the driven gear 602, the rotating inner ring 301, the rotating outer ring 302, the driven gear 602 and the driving disc 604 are synchronously rotated, the power output is uniformly provided by the driving part 306, the structure is simplified, and the transmission efficiency is high.

[0055] The lower end surface of the limiting strip 504 is flush with the upper end of the corresponding supporting roller 503, so that after the rack with different thicknesses is placed on the supporting roller 503, the rack can be effectively limited by the limiting strips 504 on both sides.

[0056] The outer wall of the rotating inner ring 301 and the rotating outer ring 302 is provided with a ball groove, and a rolling ball 309 is arranged in the ball groove and is in rolling connection with the inner wall of the furnace body 2. The rolling ball 309 can effectively reduce the friction between the rotating inner ring 301, the rotating outer ring 302 and the furnace body 2.

[0057] Sliding doors 7 are arranged on both sides of the furnace body 2, and materials are fed into the furnace through the sliding doors 7.

[0058] The support roller 503 is made of a ceramic material, which has the characteristics of high temperature resistance and high hardness, and has a long service life.

[0059] It is to be noted that the relational terms herein, such as first and second, and the like, are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0060] While the embodiments of the application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A rack batch heat treatment tempering furnace comprising a base (1), a furnace body (2) is arranged on the upper end surface of the base (1), characterized in that: The furnace body (2) and the base (1) are provided with a temperature equalizing mechanism (3) for keeping the temperature of each area of the furnace body (2) balanced, and a support frame (4) is horizontally arranged in the furnace body (2), and the inside of the support frame (4) is symmetrically provided with a sliding positioning assembly (5) for positioning a rack; The sliding positioning assembly (5) comprises: A linkage assembly (6) is arranged on the support frame (4) and the temperature equalizing mechanism (3), each side of the support frame (4) is provided with four positioning vertical bars (501), and the positioning vertical bars (501) are symmetrically arranged in the horizontal and vertical directions, the positioning vertical bars (501) are driven by the linkage assembly (6) to move horizontally and symmetrically in the support frame (4), and both ends of the positioning vertical bars (501) are provided with sliding blocks (502), and the positioning vertical bars (501) are slidably connected with the sliding grooves on the inner wall of the support frame (4) through the sliding blocks (502); A support roller (503) is transversely connected between the two positioning vertical bars (501) through a roller shaft, and the support roller (503) is used for supporting the rack and can roll relative to the rack; A limiting strip (504) is symmetrically arranged in the notch on both sides of the support frame (4), and the limiting strip (504) is located on both sides of each layer of the support roller (503) for horizontally limiting the rack; The temperature equalizing mechanism (3) comprises: A rotating inner ring (301) is arranged in the center of the inside of the furnace body (2), and rotating outer rings (302) are symmetrically arranged on both sides of the inside of the furnace body (2), the rotating inner ring (301) and the rotating outer rings (302) are rotatably connected with the inner wall of the furnace body (2), and a plurality of air flaps (303) are connected between the two sides of the rotating inner ring (301) and the rotating outer rings (302); An outer tooth ring (304) is arranged in the groove on the outer wall of the rotating inner ring (301) and the rotating outer rings (302), and a through groove (305) is arranged on the furnace wall of the furnace body (2) below the lower end of the outer tooth ring (304); A driving part (306) is arranged on the upper end surface of the base (1), an output end of the driving part (306) is connected with a transmission shaft (307), the transmission shaft (307) is horizontally arranged below the furnace body (2), a plurality of driving gears (308) are arranged on the transmission shaft (307), and the driving gears (308) are engaged with the outer tooth ring (304) through the through groove (305).

2. Rack batch heat treatment tempering furnace according to claim 1, characterized in that: The linkage assembly (6) comprises: An inner tooth ring (601) is arranged on the inner wall of the rotating inner ring (301) and the rotating outer rings (302); A driven gear (602) is arranged in the embedding groove on both sides and the middle of the support frame (4), and the shaft of the driven gear (602) is rotatably connected with the mounting hole on the support frame (4). The inner tooth frame (603) is arranged at both ends of the positioning vertical bar (501), tooth gears are arranged on the upper and lower inner walls of the inner tooth frame (603), a driving disc (604) is arranged in the inner tooth frame (603), the outer edge of the driving disc (604) is partially provided with tooth gears matched with the inner tooth frame (603), the driving disc (604) is connected with the axle of the driven gear (602), and the driving disc (604) drives the inner tooth frame (603) to reciprocatingly move horizontally.

3. Rack batch heat treatment tempering furnace according to claim 1, characterized in that: The lower end surface of the limiting strip (504) is flush with the upper end of the supporting roller (503).

4. The rack batch heat treatment tempering furnace according to claim 1, characterized in that: Sealing rings (3081) are arranged on the two sides of the driving gear (308), and the lower profile of the through groove (305) is matched with the profile of the sealing ring (3081).

5. The rack batch heat treatment tempering furnace according to claim 1, characterized in that: Ball grooves are arranged on the outer walls of the rotating inner ring (301) and the rotating outer ring (302), and the ball grooves are provided with rolling balls (309) in rolling connection with the inner wall of the furnace body (2).

6. The rack batch heat treatment tempering furnace according to claim 1, characterized in that: Sliding doors (7) are arranged at the two sides of the furnace body (2).

7. The rack batch heat treatment tempering furnace according to claim 1, characterized in that: The supporting roller (503) is made of ceramic material.

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