Tempering furnace for batch heat treatment of racks

Abstract

The tempering furnace comprises a base, a furnace body is arranged on the upper end face of the base, temperature equalizing mechanisms are arranged in the furnace body and on the base and used for keeping temperature balance of all areas of the furnace body, and a supporting frame is transversely arranged in the furnace body in a penetrating mode; sliding positioning assemblies used for positioning the racks are symmetrically arranged in the supporting frame. The device is simple in structure and reasonable in design, dynamic support is provided for the lower end face of the corresponding rack through continuous symmetrical sliding of the supporting rollers in the heat treatment process, the conditions of uneven tempering hardness, local stress concentration and the like of the rack due to the single clamping or supporting position are avoided, the overall performance of the rack is improved, and the service life of the rack is prolonged. And the actual use requirements in the field of the current high-end equipment manufacturing industry are better met, meanwhile, the temperature difference is eliminated, the performance balance of the rack in each area in the furnace body after tempering is guaranteed, and the tempering quality of the rack is further improved.

Description

Technical Field

[0001] This invention relates to the field of heat treatment equipment technology, specifically a tempering furnace for batch heat treatment of racks. Background Technology

[0002] With the rapid development of high-end equipment manufacturing, gear racks, as core components of precision transmission systems, directly affect the operating accuracy and lifespan of equipment due to their mechanical properties and dimensional stability. Tempering is one of the key processes in gear rack heat treatment, effectively eliminating quenching stress, stabilizing the microstructure, and improving the toughness and fatigue resistance of the material. Especially in aerospace, high-precision CNC machine tools, and other fields, tempered gear racks must possess extremely high hardness uniformity and dimensional stability to meet the requirements of long-term reliable operation under extreme conditions. Therefore, optimizing the gear rack tempering process and equipment is of great significance for improving the performance of high-end transmission components.

[0003] Traditional devices have the following shortcomings: Currently, tempering furnaces for rack heat treatment mostly adopt box-type or continuous structures. They use resistance heating or gas heating to raise the furnace temperature, followed by natural cooling to achieve the tempering treatment of the racks. In mass production, to avoid uneven heating caused by rack stacking, special fixtures or supports are usually used to arrange the racks at certain intervals to ensure hot air circulation. However, existing technology still has significant drawbacks: due to differences in heat conduction efficiency at the contact points between the racks and the fixtures or supports, the heating conditions in this area are inconsistent with other parts, easily leading to uneven tempering hardness and even localized stress concentration. This problem is particularly prominent in batch processing, not only reducing the overall performance consistency of the racks but also potentially affecting their service life in precision transmission systems due to localized softening or embrittlement. Summary of the Invention

[0004] The purpose of this invention is to provide a tempering furnace for batch heat treatment of racks, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a tempering furnace for batch heat treatment of racks, comprising a base, a furnace body being provided on the upper surface of the base, a temperature equalization mechanism being provided in the furnace body and on the base for maintaining the temperature balance of each area of ​​the furnace body, a support frame being transversely arranged inside the furnace body, and sliding positioning components for positioning racks being symmetrically arranged inside the support frame. The sliding positioning component includes: A linkage component is provided on the support frame and the temperature equalization mechanism. Each side of the support frame is provided with four positioning vertical bars, which are symmetrical to each other in both the horizontal and vertical directions. The positioning vertical bars are driven by the linkage component to move horizontally and symmetrically within the support frame. Each end of the positioning vertical bar is provided with a slider, and the positioning vertical bar is slidably connected to the sliding groove on the inner wall of the support frame through the slider. A support roller is laterally connected between the two positioning vertical bars via a roller shaft. The support roller is used to support the rack and can roll relative to the rack. Limiting strips are symmetrically arranged in the slots on both sides of the support frame. The limiting strips are located on both sides of each layer of the support roller and are used to limit the horizontal movement of the rack.

[0006] Preferably, the temperature equalization mechanism includes: A rotating inner ring is centrally located inside the furnace body. Rotating outer rings are symmetrically arranged on both sides of the furnace body. Both the rotating inner ring and the rotating outer ring are rotatably connected to the inner wall of the furnace body. Several air plates are connected between the two sides of the rotating inner ring and the rotating outer ring. An external toothed ring is formed in a groove on the outer wall of the inner rotating ring and the outer rotating ring, and a through groove is formed on the furnace wall of the furnace body at the lower end of the external toothed ring; The drive unit is disposed on the upper surface of the base. The output end of the drive unit is connected to a transmission shaft. The transmission shaft is horizontally disposed below the furnace body. Several drive gears are disposed on the transmission shaft. The drive gears pass through the through groove and mesh with the external gear ring.

[0007] Preferably, the linkage component includes: An internal gear ring, wherein the internal gear ring is formed on the inner wall of the rotating inner ring and the rotating outer ring; Driven gear, the driven gear is disposed in the grooves on both sides and in the middle of the support frame, and the axle of the driven gear is rotatably connected to the mounting hole on the support frame; An internal gear frame is provided at both ends of the positioning vertical bar. Teeth are provided on both the upper and lower inner walls of the internal gear frame. A drive disk is provided inside the internal gear frame. Teeth matching the internal gear frame are provided on the outer edge of the drive disk. The drive disk is connected to the axle of the driven gear. The drive disk drives the internal gear frame to reciprocate horizontally.

[0008] Preferably, the lower end face of the limiting strip is flush with the upper end of the corresponding support roller.

[0009] Preferably, sealing rings are provided on both sides of the drive gear, and the lower contour of the through groove matches the contour of the sealing rings.

[0010] Preferably, the outer walls of the inner and outer rotating rings are provided with ball bearings that are rolled and connected to the inner wall of the furnace body by means of ball grooves.

[0011] Preferably, the furnace body has sliding doors on both sides.

[0012] Preferably, the support roller is made of ceramic material.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention provides dynamic support for the lower end face of the corresponding rack by setting a sliding positioning component and utilizing the continuous symmetrical sliding of the support roller during the heat treatment process. This avoids uneven tempering hardness and local stress concentration in the rack due to clamping or single support position, thereby improving the overall performance and service life of the rack and better meeting the actual needs of the current high-end equipment manufacturing industry. 2. By incorporating a temperature equalization mechanism, this invention enables the continuous and active mixing of hot airflow in various areas of the furnace body during the tempering process through the rotation of the air vane, eliminating temperature differences and ensuring the uniform performance of the racks in various areas of the furnace body after tempering. This further improves the tempering quality of the racks. Meanwhile, the drive unit is located on the outside of the furnace body 2 and will not be affected by the high temperature inside the furnace, thus avoiding damage. 3. This invention, by setting up a linkage component, utilizes the partial tooth setting of the drive disk, in conjunction with the upper and lower teeth of the inner tooth frame, to achieve the reciprocating movement of the positioning vertical bar when the drive disk rotates. At the same time, under the meshing transmission action of the inner tooth ring and the driven gear, the rotating inner ring, rotating outer ring, driven gear and drive disk are made to rotate synchronously. The power output is uniformly provided by the drive unit, reducing the unnecessary drive structure, resulting in high transmission efficiency and convenient maintenance. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the entire invention; Figure 2 This is a schematic diagram of the internal structure of the furnace body of the present invention; Figure 3 This is a three-dimensional schematic diagram of the temperature equalization mechanism, sliding positioning component, and linkage component of the present invention; Figure 4 This is a schematic diagram showing the connection between the rotating inner ring, the rotating outer ring, and the air plate of the present invention; Figure 5 This is a three-dimensional schematic diagram of the support frame of the present invention; Figure 6 This is a schematic diagram of the driven gear and positioning bar transmission of the present invention; Figure 7 This is a side view of the overall internal structure of the present invention; Figure 8 For the present invention Figure 7An enlarged view of point A in the diagram; Figure 9 This is a front view schematic diagram of the overall internal structure of the present invention; Figure 10 For the present invention Figure 9 An enlarged schematic diagram at point B; Figure 11 For the present invention Figure 9 Enlarged view of point C; Figure 12 This is a schematic diagram showing the positioning of the rack of the present invention during the tempering process; Figure 13 This is a schematic diagram illustrating the reciprocating movement principle of the positioning vertical bar in this invention.

[0015] In the diagram: 1. Base; 2. Furnace body; 3. Temperature equalization mechanism; 301. Rotating inner ring; 302. Rotating outer ring; 303. Air vane; 304. External gear ring; 305. Through groove; 306. Drive unit; 307. Transmission shaft; 308. Drive gear; 3081. Sealing ring; 309. Ball bearing; 4. Support frame; 5. Sliding positioning assembly; 501. Positioning vertical bar; 502. Slider; 503. Support roller; 504. Limiting bar; 6. Linkage assembly; 601. Internal gear ring; 602. Driven gear; 603. Internal gear frame; 604. Drive disc; 7. Sliding door. Detailed Implementation

[0016] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0017] It should be noted that when an element is referred to as "fixed," "mounted," "connected," or "set" with another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0018] As a further improvement of the present invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0019] Please see Figure 1-13 As shown, the present invention provides a tempering furnace technical solution for batch heat treatment of racks: a tempering furnace for batch heat treatment of racks includes a base 1, a furnace body 2 is fixedly installed on the upper surface of the base 1, a temperature equalization mechanism 3 is installed inside the furnace body 2 and on the base 1 to maintain the temperature balance of each area of ​​the furnace body 2, a support frame 4 is fixedly installed horizontally through the inside of the furnace body 2, and sliding positioning components 5 for positioning racks are symmetrically installed inside the support frame 4. The support frame 4 will not rotate with the operation of the temperature equalization mechanism 3 and the sliding positioning components 5. The sliding positioning assembly 5 includes a linkage assembly 6, a support roller 503, and a limiting strip 504. The linkage assembly 6 is mounted on the support frame 4 and the temperature equalization mechanism 3. Each side of the support frame 4 has four movably arranged positioning vertical strips 501, which are symmetrical in both the horizontal and vertical directions. The linkage assembly 6 transmits power from the temperature equalization mechanism 3 to the positioning vertical strips 501, causing them to reciprocate horizontally within the support frame 4. The movement paths of the positioning vertical strips 501 on both sides of the support frame 4 are always symmetrical relative to the support frame 4. Slider blocks 502 are provided at both the upper and lower ends of each positioning vertical strip 501, allowing the vertical strip 501 to slide slidably with grooves on the inner wall of the support frame 4 via the sliders 502. The support roller 503 is horizontally connected between two positioning vertical strips 501 via a roller shaft. The support roller 503 supports the rack and can roll relative to it. The linkage assembly 6 drives the positioning vertical strips 501, thereby driving the support roller 503 to reciprocate horizontally symmetrically within the support frame 4. The limiting strips 504 are symmetrically connected in the slots on both sides of the support frame 4. The limiting strips 504 are located on both sides of each layer of support roller 503 to horizontally limit the rack, preventing the rack from shifting to one side due to frictional differences during the movement of the support roller 503. The support roller 503 will only show significant frictional differences after aging. Moreover, even if the frictional differences cause the rack to shift to one side, the rack will also shift back and forth during the reciprocating movement of the support roller 503. There will be no situation where one side of the rack is always in contact with the limiting strip 504, resulting in uneven surface tempering.

[0020] In actual use of the tempering furnace, the rack to be processed is first placed on the sliding positioning component 5, specifically above the support roller 503. Due to the limiting strip 504 and the symmetrical positioning vertical strips 501 in both the horizontal and vertical directions of the support frame 4, the support rollers 503 are also symmetrically supported on both sides below the corresponding rack. During the heat treatment process, the temperature equalization mechanism 3 remains open to balance the temperature of each area inside the furnace body 2. The linkage component 6 synchronously drives the positioning vertical strips 501 to move horizontally back and forth. The positioning vertical strips 501 then drive the support rollers 503 to move horizontally back and forth below the rack. In other words, during the heat treatment process in the tempering furnace, the rack is supported by two support rollers 503 as a group. The support of each group of support rollers 503 on the rack above it is dynamic, maintaining horizontal symmetrical movement, thereby achieving balanced heating of each surface of the rack.

[0021] By using the sliding positioning component 5, the support roller 503 continuously slides symmetrically during the heat treatment process, providing dynamic support for the lower end face of the corresponding rack. This avoids uneven tempering hardness and local stress concentration in the rack due to clamping or single support position, thus improving the overall performance and service life of the rack and better meeting the actual needs of the current high-end equipment manufacturing industry.

[0022] The temperature equalization mechanism 3 includes a rotating inner ring 301, an outer toothed ring 304, and a drive unit 306. The rotating inner ring 301 is centrally installed inside the furnace body 2. Rotating outer rings 302 are symmetrically installed on both sides of the furnace body 2. Both the rotating inner ring 301 and the rotating outer ring 302 are rotatably connected to the inner wall of the furnace body 2. Several air baffles 303 are connected between the two sides of the rotating inner ring 301 and the rotating outer ring 302. The rotating inner ring 301, the rotating outer ring 302, and the air baffles 303 are connected to form a single unit. The outer toothed ring 304 is formed in grooves on the outer walls of the rotating inner ring 301 and the rotating outer ring 302, with the outer toothed ring 304 located in the middle of the outer wall of the rotating inner ring 301 and on one side of the rotating outer ring 302, respectively. A through groove 305 is formed on the furnace wall of the furnace body 2 at the lower end of the outer toothed ring 304. The drive unit 306 is located on the upper surface of the base 1. The output end of the drive unit 306 is connected to a transmission shaft 307, which is horizontally positioned below the furnace body 2. Several drive gears 308 are mounted on the transmission shaft 307, and these drive gears 308 pass through a through groove 305 and mesh with an external gear ring 304. To ensure the heat preservation performance of the furnace body 2, the sidewalls of the drive gears 308 should fit as closely as possible to the inner wall of the through groove 305. Additionally, sealing rings 3081 are located on both sidewalls of the drive gears 308. The lower contour of the through groove 305 is slidably connected to the outer wall of the sealing ring 3081 through an arc-shaped groove, further ensuring the heat preservation performance of the furnace body 2.

[0023] During tempering in this tempering furnace, the temperature will inevitably change, and the temperature at the top of the furnace body 2 will be higher than that at the bottom. The drive unit 306 continuously drives all the drive gears 308 to rotate via the transmission shaft 307. The drive gears 308, through meshing with the outer gear ring 304, further drive the rotating inner ring 301 and rotating outer ring 302 to rotate synchronously. This is because the rotating inner ring 301, rotating outer ring 302, and air deflector 303 form a unit... Figure 4 As shown in the diagram, the air vane 303 rotates continuously along the inner wall of the furnace body 2 under the continuous drive of the drive unit 306. As the air vane 303 rotates, the gas in the upper and lower parts of the furnace body 2 is fully mixed, and the temperature difference is eliminated.

[0024] The temperature equalization mechanism 3 enables the active mixing of hot airflow in each area of ​​the furnace body 2 during the tempering process by rotating the air plate 303, eliminating temperature differences and ensuring the uniform performance of the racks in each area of ​​the furnace body 2 after tempering. This further improves the tempering quality of the racks. Meanwhile, the drive unit 306 is located on the outside of the furnace body 2 and will not be affected by the high temperature inside the furnace, thus avoiding damage.

[0025] The linkage assembly 6 includes an internal gear ring 601, a driven gear 602, and an internal gear frame 603. The internal gear ring 601 is formed on the inner walls of the rotating inner ring 301 and the rotating outer ring 302. The driven gear 602 is movably mounted in the grooves on both sides and in the middle of the support frame 4. The axle of the driven gear 602 is rotatably connected to the mounting hole on the support frame 4. The axle 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 internal gear frame 603 is formed at both ends of the positioning vertical bar 501. Teeth are formed on both the upper and lower inner walls of the internal gear frame 603. A drive disc 604 is movably mounted inside the internal gear frame 603. Teeth matching the internal gear frame 603 are formed in one-third of the outer edge area of ​​the drive disc 604. The drive disc 604 is connected to the axle of the driven gear 602 and is driven by the driven gear 602. The drive disc 604 drives the internal gear frame 603 to reciprocate horizontally.

[0026] When the inner ring 301 and the outer ring 302 rotate, the internal gear ring 601 on their inner walls drives the driven gear 602 to rotate synchronously and continuously in a specified direction. The drive disk 604 at the end of the driven gear 602 also rotates synchronously and continuously. When the teeth of the drive disk 604 mesh with the teeth above the internal gear frame 603, the internal gear frame 603 is driven to move the positioning vertical bar 501 in one direction. When the teeth of the drive disk 604 mesh with the teeth below the internal gear frame 603, the internal gear frame 603 is driven to move the positioning vertical bar 501 in the opposite direction, thereby achieving the effect of reciprocating movement.

[0027] By using the linkage component 6 and the partial tooth setting of the drive disk 604, in conjunction with the upper and lower teeth of the inner tooth frame 603, the positioning vertical bar 501 is driven to reciprocate when the drive disk 604 rotates. At the same time, under the meshing transmission action 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 drive disk 604 are made to rotate synchronously. The power output is uniformly provided by the drive unit 306, which simplifies the structure and has high transmission efficiency.

[0028] The lower end face of the limiting strip 504 is flush with the upper end of the corresponding support roller 503, ensuring that after racks of different thicknesses are placed on the support roller 503, both sides can be effectively limited by the limiting strip 504.

[0029] The inner rotating ring 301 and the outer rotating ring 302 are equipped with ball bearings 309 through ball grooves, which are rolled and connected to the inner wall of the furnace body 2. The ball bearings 309 can effectively reduce the friction between the inner rotating ring 301, the outer rotating ring 302 and the furnace body 2.

[0030] Sliding doors 7 are provided on both sides of the furnace body 2, through which materials are fed into the furnace.

[0031] The support roller 503 is made of ceramic material, which has the characteristics of high temperature resistance and high hardness, and has a long service life.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tempering furnace for batch heat treatment of racks, comprising a base (1), wherein a furnace body (2) is disposed on the upper surface of the base (1), characterized in that: A temperature equalization mechanism (3) is provided inside the furnace body (2) and on the base (1) to maintain the temperature balance of each area of ​​the furnace body (2). A support frame (4) is horizontally arranged inside the furnace body (2), and a sliding positioning component (5) for positioning rack is symmetrically arranged inside the support frame (4). The sliding positioning component (5) includes: Linkage component (6), the linkage component (6) is set on the support frame (4) and the temperature equalization mechanism (3). Each side of the support frame (4) is provided with 4 positioning vertical bars (501), and the positioning vertical bars (501) are symmetrical to each other in the horizontal and vertical directions. The positioning vertical bars (501) are driven by the linkage component (6) to move horizontally and symmetrically within the support frame (4). Both ends of the positioning vertical bars (501) are provided with sliders (502). The positioning vertical bars (501) are slidably connected to the sliding groove on the inner wall of the support frame (4) through the sliders (502). A support roller (503) is laterally connected between the two positioning vertical bars (501) via a roller shaft. The support roller (503) is used to support the rack and can roll relative to the rack. Limiting strips (504) are symmetrically arranged in the slots on both sides of the support frame (4). The limiting strips (504) are located on both sides of the support roller (503) of each layer to limit the horizontal movement of the rack.

2. The tempering furnace for batch heat treatment of racks according to claim 1, characterized in that: The temperature equalization mechanism (3) includes: A rotating inner ring (301) is centrally located inside the furnace body (2). A rotating outer ring (302) is symmetrically arranged on both sides inside the furnace body (2). Both the rotating inner ring (301) and the rotating outer ring (302) are rotatably connected to the inner wall of the furnace body (2). Several air plates (303) are connected between the two sides of the rotating inner ring (301) and the rotating outer ring (302). An external toothed ring (304) is formed in a groove on the outer wall of the rotating inner ring (301) and the rotating outer ring (302). A through groove (305) is formed on the furnace wall of the furnace body (2) at the lower end of the external toothed ring (304). The drive unit (306) is disposed on the upper surface of the base (1). The output end of the drive unit (306) is connected to a transmission shaft (307). The transmission shaft (307) is horizontally disposed below the furnace body (2). Several drive gears (308) are disposed on the transmission shaft (307). The drive gears (308) pass through the through groove (305) and mesh with the external gear ring (304).

3. The tempering furnace for batch heat treatment of racks according to claim 2, characterized in that: The linkage component (6) includes: An internal gear ring (601) is formed on the inner wall of the rotating inner ring (301) and the rotating outer ring (302); Driven gear (602), the driven gear (602) is disposed in the grooves on both sides and in the middle of the support frame (4), and the axle of the driven gear (602) is rotatably connected to the mounting hole on the support frame (4); An internal gear frame (603) is provided at both ends of the positioning vertical bar (501). Teeth are provided on both the upper and lower inner walls of the internal gear frame (603). A drive disk (604) is provided inside the internal gear frame (603). Teeth matching the internal gear frame (603) are provided on the outer edge of the drive disk (604). The drive disk (604) is connected to the axle of the driven gear (602). The drive disk (604) drives the internal gear frame (603) to reciprocate horizontally.

4. The tempering furnace for batch heat treatment of racks according to claim 1, characterized in that: The lower end face of the limiting strip (504) is flush with the upper end of the corresponding support roller (503).

5. The tempering furnace for batch heat treatment of racks according to claim 2, characterized in that: Sealing rings (3081) are provided on both sides of the drive gear (308), and the lower contour of the through groove (305) matches the contour of the sealing ring (3081).

6. The tempering furnace for batch heat treatment of racks according to claim 2, characterized in that: The inner rotating ring (301) and the outer rotating ring (302) have ball bearings (309) that are rolled and connected to the inner wall of the furnace body (2) by means of ball grooves.

7. The tempering furnace for batch heat treatment of racks according to claim 1, characterized in that: The furnace body (2) has sliding doors (7) on both sides.

8. The tempering furnace for batch heat treatment of racks according to claim 1, characterized in that: The support roller (503) is made of ceramic material.

Images